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, u16 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)
472 port = fl->fl_ip_sport;
476 port = htons(fl->fl_icmp_type);
478 #ifdef CONFIG_IPV6_MIP6
480 port = htons(fl->fl_mh_type);
490 __be16 xfrm_flowi_dport(struct flowi *fl)
497 port = fl->fl_ip_dport;
501 port = htons(fl->fl_icmp_code);
510 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
512 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
513 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
514 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
515 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
516 (fl->proto == sel->proto || !sel->proto) &&
517 (fl->oif == sel->ifindex || !sel->ifindex);
521 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
523 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
524 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
525 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
526 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
527 (fl->proto == sel->proto || !sel->proto) &&
528 (fl->oif == sel->ifindex || !sel->ifindex);
532 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
533 unsigned short family)
537 return __xfrm4_selector_match(sel, fl);
539 return __xfrm6_selector_match(sel, fl);
544 #ifdef CONFIG_SECURITY_NETWORK_XFRM
545 /* If neither has a context --> match
546 * Otherwise, both must have a context and the sids, doi, alg must match
548 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
550 return ((!s1 && !s2) ||
552 (s1->ctx_sid == s2->ctx_sid) &&
553 (s1->ctx_doi == s2->ctx_doi) &&
554 (s1->ctx_alg == s2->ctx_alg)));
557 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
563 /* A struct encoding bundle of transformations to apply to some set of flow.
565 * dst->child points to the next element of bundle.
566 * dst->xfrm points to an instanse of transformer.
568 * Due to unfortunate limitations of current routing cache, which we
569 * have no time to fix, it mirrors struct rtable and bound to the same
570 * routing key, including saddr,daddr. However, we can have many of
571 * bundles differing by session id. All the bundles grow from a parent
577 struct xfrm_dst *next;
578 struct dst_entry dst;
582 struct dst_entry *route;
584 u32 route_mtu_cached;
585 u32 child_mtu_cached;
590 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
592 dst_release(xdst->route);
593 if (likely(xdst->u.dst.xfrm))
594 xfrm_state_put(xdst->u.dst.xfrm);
597 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
603 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
606 static inline struct sec_path *
607 secpath_get(struct sec_path *sp)
610 atomic_inc(&sp->refcnt);
614 extern void __secpath_destroy(struct sec_path *sp);
617 secpath_put(struct sec_path *sp)
619 if (sp && atomic_dec_and_test(&sp->refcnt))
620 __secpath_destroy(sp);
623 extern struct sec_path *secpath_dup(struct sec_path *src);
626 secpath_reset(struct sk_buff *skb)
629 secpath_put(skb->sp);
635 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
639 return addr->a4 == 0;
641 return ipv6_addr_any((struct in6_addr *)&addr->a6);
647 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
649 return (tmpl->saddr.a4 &&
650 tmpl->saddr.a4 != x->props.saddr.a4);
654 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
656 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
657 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
661 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
665 return __xfrm4_state_addr_cmp(tmpl, x);
667 return __xfrm6_state_addr_cmp(tmpl, x);
674 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
676 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
678 if (sk && sk->sk_policy[XFRM_POLICY_IN])
679 return __xfrm_policy_check(sk, dir, skb, family);
681 return (!xfrm_policy_count[dir] && !skb->sp) ||
682 (skb->dst->flags & DST_NOPOLICY) ||
683 __xfrm_policy_check(sk, dir, skb, family);
686 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
688 return xfrm_policy_check(sk, dir, skb, AF_INET);
691 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
693 return xfrm_policy_check(sk, dir, skb, AF_INET6);
696 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
697 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
699 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
701 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
702 (skb->dst->flags & DST_NOXFRM) ||
703 __xfrm_route_forward(skb, family);
706 static inline int xfrm4_route_forward(struct sk_buff *skb)
708 return xfrm_route_forward(skb, AF_INET);
711 static inline int xfrm6_route_forward(struct sk_buff *skb)
713 return xfrm_route_forward(skb, AF_INET6);
716 extern int __xfrm_sk_clone_policy(struct sock *sk);
718 static inline int xfrm_sk_clone_policy(struct sock *sk)
720 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
721 return __xfrm_sk_clone_policy(sk);
725 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
727 static inline void xfrm_sk_free_policy(struct sock *sk)
729 if (unlikely(sk->sk_policy[0] != NULL)) {
730 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
731 sk->sk_policy[0] = NULL;
733 if (unlikely(sk->sk_policy[1] != NULL)) {
734 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
735 sk->sk_policy[1] = NULL;
741 static inline void xfrm_sk_free_policy(struct sock *sk) {}
742 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
743 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
744 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
745 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
749 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
753 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
760 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
764 return (xfrm_address_t *)&fl->fl4_dst;
766 return (xfrm_address_t *)&fl->fl6_dst;
772 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
776 return (xfrm_address_t *)&fl->fl4_src;
778 return (xfrm_address_t *)&fl->fl6_src;
783 static __inline__ int
784 __xfrm4_state_addr_check(struct xfrm_state *x,
785 xfrm_address_t *daddr, xfrm_address_t *saddr)
787 if (daddr->a4 == x->id.daddr.a4 &&
788 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
793 static __inline__ int
794 __xfrm6_state_addr_check(struct xfrm_state *x,
795 xfrm_address_t *daddr, xfrm_address_t *saddr)
797 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
798 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
799 ipv6_addr_any((struct in6_addr *)saddr) ||
800 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
805 static __inline__ int
806 xfrm_state_addr_check(struct xfrm_state *x,
807 xfrm_address_t *daddr, xfrm_address_t *saddr,
808 unsigned short family)
812 return __xfrm4_state_addr_check(x, daddr, saddr);
814 return __xfrm6_state_addr_check(x, daddr, saddr);
819 static __inline__ int
820 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
821 unsigned short family)
825 return __xfrm4_state_addr_check(x,
826 (xfrm_address_t *)&fl->fl4_dst,
827 (xfrm_address_t *)&fl->fl4_src);
829 return __xfrm6_state_addr_check(x,
830 (xfrm_address_t *)&fl->fl6_dst,
831 (xfrm_address_t *)&fl->fl6_src);
836 static inline int xfrm_state_kern(struct xfrm_state *x)
838 return atomic_read(&x->tunnel_users);
841 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
843 return (!userproto || proto == userproto ||
844 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
845 proto == IPPROTO_ESP ||
846 proto == IPPROTO_COMP)));
850 * xfrm algorithm information
852 struct xfrm_algo_auth_info {
857 struct xfrm_algo_encr_info {
862 struct xfrm_algo_comp_info {
866 struct xfrm_algo_desc {
871 struct xfrm_algo_auth_info auth;
872 struct xfrm_algo_encr_info encr;
873 struct xfrm_algo_comp_info comp;
875 struct sadb_alg desc;
878 /* XFRM tunnel handlers. */
880 int (*handler)(struct sk_buff *skb);
881 int (*err_handler)(struct sk_buff *skb, __u32 info);
883 struct xfrm_tunnel *next;
887 struct xfrm6_tunnel {
888 int (*handler)(struct sk_buff *skb);
889 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
890 int type, int code, int offset, __u32 info);
892 struct xfrm6_tunnel *next;
896 extern void xfrm_init(void);
897 extern void xfrm4_init(void);
898 extern void xfrm6_init(void);
899 extern void xfrm6_fini(void);
900 extern void xfrm_state_init(void);
901 extern void xfrm4_state_init(void);
902 extern void xfrm6_state_init(void);
903 extern void xfrm6_state_fini(void);
905 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
906 extern struct xfrm_state *xfrm_state_alloc(void);
907 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
908 struct flowi *fl, struct xfrm_tmpl *tmpl,
909 struct xfrm_policy *pol, int *err,
910 unsigned short family);
911 extern int xfrm_state_check_expire(struct xfrm_state *x);
912 extern void xfrm_state_insert(struct xfrm_state *x);
913 extern int xfrm_state_add(struct xfrm_state *x);
914 extern int xfrm_state_update(struct xfrm_state *x);
915 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
916 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
917 #ifdef CONFIG_XFRM_SUB_POLICY
918 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
919 int n, unsigned short family);
920 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
921 int n, unsigned short family);
923 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
924 int n, unsigned short family)
929 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
930 int n, unsigned short family)
935 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
936 extern int xfrm_state_delete(struct xfrm_state *x);
937 extern void xfrm_state_flush(u8 proto);
938 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
939 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
940 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
941 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
942 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
943 extern int xfrm_init_state(struct xfrm_state *x);
944 extern int xfrm4_rcv(struct sk_buff *skb);
945 extern int xfrm4_output(struct sk_buff *skb);
946 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
947 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
948 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
949 extern int xfrm6_rcv(struct sk_buff **pskb);
950 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
951 xfrm_address_t *saddr, u8 proto);
952 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
953 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
954 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
955 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
956 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
957 extern int xfrm6_output(struct sk_buff *skb);
958 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
962 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
963 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
964 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
966 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
971 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
973 /* should not happen */
977 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
983 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
984 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
985 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
986 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
987 struct xfrm_selector *sel,
988 struct xfrm_sec_ctx *ctx, int delete);
989 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete);
990 void xfrm_policy_flush(u8 type);
991 u32 xfrm_get_acqseq(void);
992 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
993 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
994 xfrm_address_t *daddr, xfrm_address_t *saddr,
995 int create, unsigned short family);
996 extern void xfrm_policy_flush(u8 type);
997 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
998 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family, int strict);
999 extern void xfrm_init_pmtu(struct dst_entry *dst);
1001 extern wait_queue_head_t km_waitq;
1002 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1003 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1004 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1006 extern void xfrm_input_init(void);
1007 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1009 extern void xfrm_probe_algs(void);
1010 extern int xfrm_count_auth_supported(void);
1011 extern int xfrm_count_enc_supported(void);
1012 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1013 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1014 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1015 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1016 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1017 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1018 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1019 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1023 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1026 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1027 int offset, int len, icv_update_fn_t icv_update);
1029 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1035 return a->a4 - b->a4;
1037 return ipv6_addr_cmp((struct in6_addr *)a,
1038 (struct in6_addr *)b);
1042 static inline int xfrm_policy_id2dir(u32 index)
1047 static inline int xfrm_aevent_is_on(void)
1053 nlsk = rcu_dereference(xfrm_nl);
1055 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1060 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1062 if (xfrm_aevent_is_on())
1063 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1067 #endif /* _NET_XFRM_H */