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 */
426 #ifdef CONFIG_AUDITSYSCALL
427 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
428 struct xfrm_policy *xp, struct xfrm_state *x);
430 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
431 #endif /* CONFIG_AUDITSYSCALL */
433 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
435 if (likely(policy != NULL))
436 atomic_inc(&policy->refcnt);
439 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
441 static inline void xfrm_pol_put(struct xfrm_policy *policy)
443 if (atomic_dec_and_test(&policy->refcnt))
444 __xfrm_policy_destroy(policy);
447 #ifdef CONFIG_XFRM_SUB_POLICY
448 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
451 for (i = npols - 1; i >= 0; --i)
452 xfrm_pol_put(pols[i]);
455 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
457 xfrm_pol_put(pols[0]);
461 extern void __xfrm_state_destroy(struct xfrm_state *);
463 static inline void __xfrm_state_put(struct xfrm_state *x)
465 atomic_dec(&x->refcnt);
468 static inline void xfrm_state_put(struct xfrm_state *x)
470 if (atomic_dec_and_test(&x->refcnt))
471 __xfrm_state_destroy(x);
474 static inline void xfrm_state_hold(struct xfrm_state *x)
476 atomic_inc(&x->refcnt);
479 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
486 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
487 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
490 if (memcmp(a1, a2, pdw << 2))
496 mask = htonl((0xffffffff) << (32 - pbi));
498 if ((a1[pdw] ^ a2[pdw]) & mask)
506 __be16 xfrm_flowi_sport(struct flowi *fl)
512 case IPPROTO_UDPLITE:
514 port = fl->fl_ip_sport;
518 port = htons(fl->fl_icmp_type);
520 #ifdef CONFIG_IPV6_MIP6
522 port = htons(fl->fl_mh_type);
532 __be16 xfrm_flowi_dport(struct flowi *fl)
538 case IPPROTO_UDPLITE:
540 port = fl->fl_ip_dport;
544 port = htons(fl->fl_icmp_code);
552 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
553 unsigned short family);
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;
595 u32 route_mtu_cached;
596 u32 child_mtu_cached;
601 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
603 dst_release(xdst->route);
604 if (likely(xdst->u.dst.xfrm))
605 xfrm_state_put(xdst->u.dst.xfrm);
608 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
614 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
617 static inline struct sec_path *
618 secpath_get(struct sec_path *sp)
621 atomic_inc(&sp->refcnt);
625 extern void __secpath_destroy(struct sec_path *sp);
628 secpath_put(struct sec_path *sp)
630 if (sp && atomic_dec_and_test(&sp->refcnt))
631 __secpath_destroy(sp);
634 extern struct sec_path *secpath_dup(struct sec_path *src);
637 secpath_reset(struct sk_buff *skb)
640 secpath_put(skb->sp);
646 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
650 return addr->a4 == 0;
652 return ipv6_addr_any((struct in6_addr *)&addr->a6);
658 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
660 return (tmpl->saddr.a4 &&
661 tmpl->saddr.a4 != x->props.saddr.a4);
665 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
667 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
668 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
672 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
676 return __xfrm4_state_addr_cmp(tmpl, x);
678 return __xfrm6_state_addr_cmp(tmpl, x);
685 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
687 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
689 if (sk && sk->sk_policy[XFRM_POLICY_IN])
690 return __xfrm_policy_check(sk, dir, skb, family);
692 return (!xfrm_policy_count[dir] && !skb->sp) ||
693 (skb->dst->flags & DST_NOPOLICY) ||
694 __xfrm_policy_check(sk, dir, skb, family);
697 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
699 return xfrm_policy_check(sk, dir, skb, AF_INET);
702 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
704 return xfrm_policy_check(sk, dir, skb, AF_INET6);
707 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
708 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
710 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
712 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
713 (skb->dst->flags & DST_NOXFRM) ||
714 __xfrm_route_forward(skb, family);
717 static inline int xfrm4_route_forward(struct sk_buff *skb)
719 return xfrm_route_forward(skb, AF_INET);
722 static inline int xfrm6_route_forward(struct sk_buff *skb)
724 return xfrm_route_forward(skb, AF_INET6);
727 extern int __xfrm_sk_clone_policy(struct sock *sk);
729 static inline int xfrm_sk_clone_policy(struct sock *sk)
731 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
732 return __xfrm_sk_clone_policy(sk);
736 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
738 static inline void xfrm_sk_free_policy(struct sock *sk)
740 if (unlikely(sk->sk_policy[0] != NULL)) {
741 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
742 sk->sk_policy[0] = NULL;
744 if (unlikely(sk->sk_policy[1] != NULL)) {
745 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
746 sk->sk_policy[1] = NULL;
752 static inline void xfrm_sk_free_policy(struct sock *sk) {}
753 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
754 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
755 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
756 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
760 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
764 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
771 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
775 return (xfrm_address_t *)&fl->fl4_dst;
777 return (xfrm_address_t *)&fl->fl6_dst;
783 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
787 return (xfrm_address_t *)&fl->fl4_src;
789 return (xfrm_address_t *)&fl->fl6_src;
794 static __inline__ int
795 __xfrm4_state_addr_check(struct xfrm_state *x,
796 xfrm_address_t *daddr, xfrm_address_t *saddr)
798 if (daddr->a4 == x->id.daddr.a4 &&
799 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
804 static __inline__ int
805 __xfrm6_state_addr_check(struct xfrm_state *x,
806 xfrm_address_t *daddr, xfrm_address_t *saddr)
808 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
809 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
810 ipv6_addr_any((struct in6_addr *)saddr) ||
811 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
816 static __inline__ int
817 xfrm_state_addr_check(struct xfrm_state *x,
818 xfrm_address_t *daddr, xfrm_address_t *saddr,
819 unsigned short family)
823 return __xfrm4_state_addr_check(x, daddr, saddr);
825 return __xfrm6_state_addr_check(x, daddr, saddr);
830 static __inline__ int
831 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
832 unsigned short family)
836 return __xfrm4_state_addr_check(x,
837 (xfrm_address_t *)&fl->fl4_dst,
838 (xfrm_address_t *)&fl->fl4_src);
840 return __xfrm6_state_addr_check(x,
841 (xfrm_address_t *)&fl->fl6_dst,
842 (xfrm_address_t *)&fl->fl6_src);
847 static inline int xfrm_state_kern(struct xfrm_state *x)
849 return atomic_read(&x->tunnel_users);
852 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
854 return (!userproto || proto == userproto ||
855 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
856 proto == IPPROTO_ESP ||
857 proto == IPPROTO_COMP)));
861 * xfrm algorithm information
863 struct xfrm_algo_auth_info {
868 struct xfrm_algo_encr_info {
873 struct xfrm_algo_comp_info {
877 struct xfrm_algo_desc {
882 struct xfrm_algo_auth_info auth;
883 struct xfrm_algo_encr_info encr;
884 struct xfrm_algo_comp_info comp;
886 struct sadb_alg desc;
889 /* XFRM tunnel handlers. */
891 int (*handler)(struct sk_buff *skb);
892 int (*err_handler)(struct sk_buff *skb, __u32 info);
894 struct xfrm_tunnel *next;
898 struct xfrm6_tunnel {
899 int (*handler)(struct sk_buff *skb);
900 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
901 int type, int code, int offset, __be32 info);
902 struct xfrm6_tunnel *next;
906 extern void xfrm_init(void);
907 extern void xfrm4_init(void);
908 extern void xfrm6_init(void);
909 extern void xfrm6_fini(void);
910 extern void xfrm_state_init(void);
911 extern void xfrm4_state_init(void);
912 extern void xfrm6_state_init(void);
913 extern void xfrm6_state_fini(void);
915 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
916 extern struct xfrm_state *xfrm_state_alloc(void);
917 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
918 struct flowi *fl, struct xfrm_tmpl *tmpl,
919 struct xfrm_policy *pol, int *err,
920 unsigned short family);
921 extern int xfrm_state_check_expire(struct xfrm_state *x);
922 extern void xfrm_state_insert(struct xfrm_state *x);
923 extern int xfrm_state_add(struct xfrm_state *x);
924 extern int xfrm_state_update(struct xfrm_state *x);
925 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
926 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
927 #ifdef CONFIG_XFRM_SUB_POLICY
928 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
929 int n, unsigned short family);
930 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
931 int n, unsigned short family);
933 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
934 int n, unsigned short family)
939 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
940 int n, unsigned short family)
945 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
946 extern int xfrm_state_delete(struct xfrm_state *x);
947 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
948 extern void xfrm_sad_getinfo(struct xfrm_sadinfo *si);
949 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
950 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
951 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
952 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
953 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
954 extern int xfrm_init_state(struct xfrm_state *x);
955 extern int xfrm4_rcv(struct sk_buff *skb);
956 extern int xfrm4_output(struct sk_buff *skb);
957 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
958 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
959 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
960 extern int xfrm6_rcv(struct sk_buff **pskb);
961 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
962 xfrm_address_t *saddr, u8 proto);
963 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
964 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
965 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
966 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
967 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
968 extern int xfrm6_output(struct sk_buff *skb);
969 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
973 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
974 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
975 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
977 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
982 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
984 /* should not happen */
988 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
994 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
995 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
996 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
997 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
998 struct xfrm_selector *sel,
999 struct xfrm_sec_ctx *ctx, int delete,
1001 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1002 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1003 u32 xfrm_get_acqseq(void);
1004 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1005 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1006 xfrm_address_t *daddr, xfrm_address_t *saddr,
1007 int create, unsigned short family);
1008 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1009 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1010 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1011 struct flowi *fl, int family, int strict);
1012 extern void xfrm_init_pmtu(struct dst_entry *dst);
1014 #ifdef CONFIG_XFRM_MIGRATE
1015 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1016 struct xfrm_migrate *m, int num_bundles);
1017 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1018 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1019 struct xfrm_migrate *m);
1020 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1021 struct xfrm_migrate *m, int num_bundles);
1024 extern wait_queue_head_t km_waitq;
1025 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1026 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1027 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1029 extern void xfrm_input_init(void);
1030 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1032 extern void xfrm_probe_algs(void);
1033 extern int xfrm_count_auth_supported(void);
1034 extern int xfrm_count_enc_supported(void);
1035 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1036 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1037 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1038 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1039 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1040 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1041 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1042 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1046 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1049 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1050 int offset, int len, icv_update_fn_t icv_update);
1052 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1058 return (__force __u32)a->a4 - (__force __u32)b->a4;
1060 return ipv6_addr_cmp((struct in6_addr *)a,
1061 (struct in6_addr *)b);
1065 static inline int xfrm_policy_id2dir(u32 index)
1070 static inline int xfrm_aevent_is_on(void)
1076 nlsk = rcu_dereference(xfrm_nl);
1078 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1083 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1085 if (xfrm_aevent_is_on())
1086 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1089 #ifdef CONFIG_XFRM_MIGRATE
1090 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1092 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1095 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1098 for (i = 0; i < n; i++)
1099 xfrm_state_put(*(states + i));
1102 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1105 for (i = 0; i < n; i++)
1106 xfrm_state_delete(*(states + i));
1110 #endif /* _NET_XFRM_H */