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 list_head bydst;
98 struct list_head bysrc;
99 struct list_head byspi;
105 struct xfrm_selector sel;
107 /* Key manger bits */
114 /* Parameters of this state. */
119 u8 aalgo, ealgo, calgo;
122 xfrm_address_t saddr;
127 struct xfrm_lifetime_cfg lft;
129 /* Data for transformer */
130 struct xfrm_algo *aalg;
131 struct xfrm_algo *ealg;
132 struct xfrm_algo *calg;
134 /* Data for encapsulator */
135 struct xfrm_encap_tmpl *encap;
137 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
138 struct xfrm_state *tunnel;
140 /* If a tunnel, number of users + 1 */
141 atomic_t tunnel_users;
143 /* State for replay detection */
144 struct xfrm_replay_state replay;
146 /* Replay detection state at the time we sent the last notification */
147 struct xfrm_replay_state preplay;
149 /* internal flag that only holds state for delayed aevent at the
154 /* Replay detection notification settings */
158 /* Replay detection notification timer */
159 struct timer_list rtimer;
162 struct xfrm_stats stats;
164 struct xfrm_lifetime_cur curlft;
165 struct timer_list timer;
167 /* Reference to data common to all the instances of this
169 struct xfrm_type *type;
170 struct xfrm_mode *mode;
172 /* Security context */
173 struct xfrm_sec_ctx *security;
175 /* Private data of this transformer, format is opaque,
176 * interpreted by xfrm_type methods. */
180 /* xflags - make enum if more show up */
181 #define XFRM_TIME_DEFER 1
192 /* callback structure passed from either netlink or pfkey */
209 struct xfrm_policy_afinfo {
210 unsigned short family;
211 struct xfrm_type *type_map[IPPROTO_MAX];
212 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
213 struct dst_ops *dst_ops;
214 void (*garbage_collect)(void);
215 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
216 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
217 int (*bundle_create)(struct xfrm_policy *policy,
218 struct xfrm_state **xfrm,
221 struct dst_entry **dst_p);
222 void (*decode_session)(struct sk_buff *skb,
226 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
227 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
228 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
229 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
230 #define XFRM_ACQ_EXPIRES 30
233 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
234 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
235 extern int __xfrm_state_delete(struct xfrm_state *x);
237 struct xfrm_state_afinfo {
238 unsigned short family;
239 struct list_head *state_bydst;
240 struct list_head *state_bysrc;
241 struct list_head *state_byspi;
242 int (*init_flags)(struct xfrm_state *x);
243 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
244 struct xfrm_tmpl *tmpl,
245 xfrm_address_t *daddr, xfrm_address_t *saddr);
246 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
247 struct xfrm_state *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
248 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
249 xfrm_address_t *daddr, xfrm_address_t *saddr,
253 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
254 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
256 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
261 struct module *owner;
264 int (*init_state)(struct xfrm_state *x);
265 void (*destructor)(struct xfrm_state *);
266 int (*input)(struct xfrm_state *, struct sk_buff *skb);
267 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
268 /* Estimate maximal size of result of transformation of a dgram */
269 u32 (*get_max_size)(struct xfrm_state *, int size);
272 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
273 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
274 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
275 extern void xfrm_put_type(struct xfrm_type *type);
278 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
279 int (*output)(struct sk_buff *skb);
281 struct module *owner;
285 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
286 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
287 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
288 extern void xfrm_put_mode(struct xfrm_mode *mode);
292 /* id in template is interpreted as:
293 * daddr - destination of tunnel, may be zero for transport mode.
294 * spi - zero to acquire spi. Not zero if spi is static, then
295 * daddr must be fixed too.
296 * proto - AH/ESP/IPCOMP
300 /* Source address of tunnel. Ignored, if it is not a tunnel. */
301 xfrm_address_t saddr;
305 /* Mode: transport, tunnel etc. */
308 /* Sharing mode: unique, this session only, this user only etc. */
311 /* May skip this transfomration if no SA is found */
314 /* Bit mask of algos allowed for acquisition */
320 #define XFRM_MAX_DEPTH 6
324 struct xfrm_policy *next;
325 struct list_head list;
327 /* This lock only affects elements except for entry. */
330 struct timer_list timer;
334 struct xfrm_selector selector;
335 struct xfrm_lifetime_cfg lft;
336 struct xfrm_lifetime_cur curlft;
337 struct dst_entry *bundles;
343 struct xfrm_sec_ctx *security;
344 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
347 #define XFRM_KM_TIMEOUT 30
349 #define XFRM_REPLAY_SEQ 1
350 #define XFRM_REPLAY_OSEQ 2
351 #define XFRM_REPLAY_SEQ_MASK 3
353 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
354 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
356 /* default aevent timeout in units of 100ms */
357 #define XFRM_AE_ETIME 10
358 /* Async Event timer multiplier */
359 #define XFRM_AE_ETH_M 10
360 /* default seq threshold size */
361 #define XFRM_AE_SEQT_SIZE 2
365 struct list_head list;
367 int (*notify)(struct xfrm_state *x, struct km_event *c);
368 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
369 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
370 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
371 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
374 extern int xfrm_register_km(struct xfrm_mgr *km);
375 extern int xfrm_unregister_km(struct xfrm_mgr *km);
378 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
380 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
382 if (likely(policy != NULL))
383 atomic_inc(&policy->refcnt);
386 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
388 static inline void xfrm_pol_put(struct xfrm_policy *policy)
390 if (atomic_dec_and_test(&policy->refcnt))
391 __xfrm_policy_destroy(policy);
394 #define XFRM_DST_HSIZE 1024
397 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
401 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
406 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
409 h = ntohl(addr->a6[2]^addr->a6[3]);
410 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
415 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
419 return __xfrm4_dst_hash(addr);
421 return __xfrm6_dst_hash(addr);
427 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
429 return __xfrm4_dst_hash(addr);
433 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
435 return __xfrm6_dst_hash(addr);
439 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
443 return __xfrm4_src_hash(addr);
445 return __xfrm6_src_hash(addr);
451 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
454 h = ntohl(addr->a4^spi^proto);
455 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
460 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
463 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
464 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
469 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
473 return __xfrm4_spi_hash(addr, spi, proto);
475 return __xfrm6_spi_hash(addr, spi, proto);
480 extern void __xfrm_state_destroy(struct xfrm_state *);
482 static inline void __xfrm_state_put(struct xfrm_state *x)
484 atomic_dec(&x->refcnt);
487 static inline void xfrm_state_put(struct xfrm_state *x)
489 if (atomic_dec_and_test(&x->refcnt))
490 __xfrm_state_destroy(x);
493 static inline void xfrm_state_hold(struct xfrm_state *x)
495 atomic_inc(&x->refcnt);
498 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
505 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
506 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
509 if (memcmp(a1, a2, pdw << 2))
515 mask = htonl((0xffffffff) << (32 - pbi));
517 if ((a1[pdw] ^ a2[pdw]) & mask)
525 u16 xfrm_flowi_sport(struct flowi *fl)
532 port = fl->fl_ip_sport;
536 port = htons(fl->fl_icmp_type);
545 u16 xfrm_flowi_dport(struct flowi *fl)
552 port = fl->fl_ip_dport;
556 port = htons(fl->fl_icmp_code);
565 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
567 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
568 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
569 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
570 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
571 (fl->proto == sel->proto || !sel->proto) &&
572 (fl->oif == sel->ifindex || !sel->ifindex);
576 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
578 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
579 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
580 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
581 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
582 (fl->proto == sel->proto || !sel->proto) &&
583 (fl->oif == sel->ifindex || !sel->ifindex);
587 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
588 unsigned short family)
592 return __xfrm4_selector_match(sel, fl);
594 return __xfrm6_selector_match(sel, fl);
599 #ifdef CONFIG_SECURITY_NETWORK_XFRM
600 /* If neither has a context --> match
601 * Otherwise, both must have a context and the sids, doi, alg must match
603 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
605 return ((!s1 && !s2) ||
607 (s1->ctx_sid == s2->ctx_sid) &&
608 (s1->ctx_doi == s2->ctx_doi) &&
609 (s1->ctx_alg == s2->ctx_alg)));
612 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
618 /* A struct encoding bundle of transformations to apply to some set of flow.
620 * dst->child points to the next element of bundle.
621 * dst->xfrm points to an instanse of transformer.
623 * Due to unfortunate limitations of current routing cache, which we
624 * have no time to fix, it mirrors struct rtable and bound to the same
625 * routing key, including saddr,daddr. However, we can have many of
626 * bundles differing by session id. All the bundles grow from a parent
632 struct xfrm_dst *next;
633 struct dst_entry dst;
637 struct dst_entry *route;
638 u32 route_mtu_cached;
639 u32 child_mtu_cached;
644 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
646 dst_release(xdst->route);
647 if (likely(xdst->u.dst.xfrm))
648 xfrm_state_put(xdst->u.dst.xfrm);
651 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
657 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
660 static inline struct sec_path *
661 secpath_get(struct sec_path *sp)
664 atomic_inc(&sp->refcnt);
668 extern void __secpath_destroy(struct sec_path *sp);
671 secpath_put(struct sec_path *sp)
673 if (sp && atomic_dec_and_test(&sp->refcnt))
674 __secpath_destroy(sp);
677 extern struct sec_path *secpath_dup(struct sec_path *src);
680 secpath_reset(struct sk_buff *skb)
683 secpath_put(skb->sp);
689 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
691 return (tmpl->saddr.a4 &&
692 tmpl->saddr.a4 != x->props.saddr.a4);
696 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
698 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
699 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
703 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
707 return __xfrm4_state_addr_cmp(tmpl, x);
709 return __xfrm6_state_addr_cmp(tmpl, x);
716 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
718 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
720 if (sk && sk->sk_policy[XFRM_POLICY_IN])
721 return __xfrm_policy_check(sk, dir, skb, family);
723 return (!xfrm_policy_list[dir] && !skb->sp) ||
724 (skb->dst->flags & DST_NOPOLICY) ||
725 __xfrm_policy_check(sk, dir, skb, family);
728 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
730 return xfrm_policy_check(sk, dir, skb, AF_INET);
733 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
735 return xfrm_policy_check(sk, dir, skb, AF_INET6);
738 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
739 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
741 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
743 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
744 (skb->dst->flags & DST_NOXFRM) ||
745 __xfrm_route_forward(skb, family);
748 static inline int xfrm4_route_forward(struct sk_buff *skb)
750 return xfrm_route_forward(skb, AF_INET);
753 static inline int xfrm6_route_forward(struct sk_buff *skb)
755 return xfrm_route_forward(skb, AF_INET6);
758 extern int __xfrm_sk_clone_policy(struct sock *sk);
760 static inline int xfrm_sk_clone_policy(struct sock *sk)
762 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
763 return __xfrm_sk_clone_policy(sk);
767 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
769 static inline void xfrm_sk_free_policy(struct sock *sk)
771 if (unlikely(sk->sk_policy[0] != NULL)) {
772 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
773 sk->sk_policy[0] = NULL;
775 if (unlikely(sk->sk_policy[1] != NULL)) {
776 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
777 sk->sk_policy[1] = NULL;
783 static inline void xfrm_sk_free_policy(struct sock *sk) {}
784 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
785 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
786 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
787 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
791 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
795 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
802 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
806 return (xfrm_address_t *)&fl->fl4_dst;
808 return (xfrm_address_t *)&fl->fl6_dst;
814 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
818 return (xfrm_address_t *)&fl->fl4_src;
820 return (xfrm_address_t *)&fl->fl6_src;
825 static __inline__ int
826 __xfrm4_state_addr_check(struct xfrm_state *x,
827 xfrm_address_t *daddr, xfrm_address_t *saddr)
829 if (daddr->a4 == x->id.daddr.a4 &&
830 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
835 static __inline__ int
836 __xfrm6_state_addr_check(struct xfrm_state *x,
837 xfrm_address_t *daddr, xfrm_address_t *saddr)
839 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
840 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
841 ipv6_addr_any((struct in6_addr *)saddr) ||
842 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
847 static __inline__ int
848 xfrm_state_addr_check(struct xfrm_state *x,
849 xfrm_address_t *daddr, xfrm_address_t *saddr,
850 unsigned short family)
854 return __xfrm4_state_addr_check(x, daddr, saddr);
856 return __xfrm6_state_addr_check(x, daddr, saddr);
861 static inline int xfrm_state_kern(struct xfrm_state *x)
863 return atomic_read(&x->tunnel_users);
866 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
868 return (!userproto || proto == userproto ||
869 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
870 proto == IPPROTO_ESP ||
871 proto == IPPROTO_COMP)));
875 * xfrm algorithm information
877 struct xfrm_algo_auth_info {
882 struct xfrm_algo_encr_info {
887 struct xfrm_algo_comp_info {
891 struct xfrm_algo_desc {
896 struct xfrm_algo_auth_info auth;
897 struct xfrm_algo_encr_info encr;
898 struct xfrm_algo_comp_info comp;
900 struct sadb_alg desc;
903 /* XFRM tunnel handlers. */
905 int (*handler)(struct sk_buff *skb);
906 int (*err_handler)(struct sk_buff *skb, __u32 info);
908 struct xfrm_tunnel *next;
912 struct xfrm6_tunnel {
913 int (*handler)(struct sk_buff *skb);
914 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
915 int type, int code, int offset, __u32 info);
917 struct xfrm6_tunnel *next;
921 extern void xfrm_init(void);
922 extern void xfrm4_init(void);
923 extern void xfrm6_init(void);
924 extern void xfrm6_fini(void);
925 extern void xfrm_state_init(void);
926 extern void xfrm4_state_init(void);
927 extern void xfrm6_state_init(void);
928 extern void xfrm6_state_fini(void);
930 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
931 extern struct xfrm_state *xfrm_state_alloc(void);
932 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
933 struct flowi *fl, struct xfrm_tmpl *tmpl,
934 struct xfrm_policy *pol, int *err,
935 unsigned short family);
936 extern int xfrm_state_check_expire(struct xfrm_state *x);
937 extern void xfrm_state_insert(struct xfrm_state *x);
938 extern int xfrm_state_add(struct xfrm_state *x);
939 extern int xfrm_state_update(struct xfrm_state *x);
940 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
941 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
942 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
943 extern int xfrm_state_delete(struct xfrm_state *x);
944 extern void xfrm_state_flush(u8 proto);
945 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
946 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
947 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
948 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
949 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
950 extern int xfrm_init_state(struct xfrm_state *x);
951 extern int xfrm4_rcv(struct sk_buff *skb);
952 extern int xfrm4_output(struct sk_buff *skb);
953 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
954 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
955 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
956 extern int xfrm6_rcv(struct sk_buff **pskb);
957 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
958 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
959 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
960 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
961 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
962 extern int xfrm6_output(struct sk_buff *skb);
965 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
966 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
967 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
969 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
974 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
976 /* should not happen */
980 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
986 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
987 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
988 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
989 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
990 struct xfrm_sec_ctx *ctx, int delete);
991 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
992 void xfrm_policy_flush(void);
993 u32 xfrm_get_acqseq(void);
994 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
995 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
996 xfrm_address_t *daddr, xfrm_address_t *saddr,
997 int create, unsigned short family);
998 extern void xfrm_policy_flush(void);
999 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1000 extern int xfrm_flush_bundles(void);
1001 extern void xfrm_flush_all_bundles(void);
1002 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
1003 extern void xfrm_init_pmtu(struct dst_entry *dst);
1005 extern wait_queue_head_t km_waitq;
1006 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1007 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1009 extern void xfrm_input_init(void);
1010 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1012 extern void xfrm_probe_algs(void);
1013 extern int xfrm_count_auth_supported(void);
1014 extern int xfrm_count_enc_supported(void);
1015 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1016 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1017 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1018 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1019 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1020 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1021 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1022 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1026 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1029 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1030 int offset, int len, icv_update_fn_t icv_update);
1032 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1038 return a->a4 - b->a4;
1040 return ipv6_addr_cmp((struct in6_addr *)a,
1041 (struct in6_addr *)b);
1045 static inline int xfrm_policy_id2dir(u32 index)
1050 static inline int xfrm_aevent_is_on(void)
1056 nlsk = rcu_dereference(xfrm_nl);
1058 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1063 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1065 if (xfrm_aevent_is_on())
1066 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1070 #endif /* _NET_XFRM_H */