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 /* Data for care-of address */
138 xfrm_address_t *coaddr;
140 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
141 struct xfrm_state *tunnel;
143 /* If a tunnel, number of users + 1 */
144 atomic_t tunnel_users;
146 /* State for replay detection */
147 struct xfrm_replay_state replay;
149 /* Replay detection state at the time we sent the last notification */
150 struct xfrm_replay_state preplay;
152 /* internal flag that only holds state for delayed aevent at the
157 /* Replay detection notification settings */
161 /* Replay detection notification timer */
162 struct timer_list rtimer;
165 struct xfrm_stats stats;
167 struct xfrm_lifetime_cur curlft;
168 struct timer_list timer;
173 /* Reference to data common to all the instances of this
175 struct xfrm_type *type;
176 struct xfrm_mode *mode;
178 /* Security context */
179 struct xfrm_sec_ctx *security;
181 /* Private data of this transformer, format is opaque,
182 * interpreted by xfrm_type methods. */
186 /* xflags - make enum if more show up */
187 #define XFRM_TIME_DEFER 1
198 /* callback structure passed from either netlink or pfkey */
215 struct xfrm_policy_afinfo {
216 unsigned short family;
217 struct xfrm_type *type_map[IPPROTO_MAX];
218 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
219 struct dst_ops *dst_ops;
220 void (*garbage_collect)(void);
221 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
222 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
223 int (*bundle_create)(struct xfrm_policy *policy,
224 struct xfrm_state **xfrm,
227 struct dst_entry **dst_p);
228 void (*decode_session)(struct sk_buff *skb,
232 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
233 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
234 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
235 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
236 #define XFRM_ACQ_EXPIRES 30
239 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
240 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
241 extern int __xfrm_state_delete(struct xfrm_state *x);
243 struct xfrm_state_afinfo {
244 unsigned short family;
245 struct list_head *state_bydst;
246 struct list_head *state_bysrc;
247 struct list_head *state_byspi;
248 int (*init_flags)(struct xfrm_state *x);
249 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
250 struct xfrm_tmpl *tmpl,
251 xfrm_address_t *daddr, xfrm_address_t *saddr);
252 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
253 struct xfrm_state *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
254 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
255 xfrm_address_t *daddr, xfrm_address_t *saddr,
259 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
262 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
267 struct module *owner;
270 #define XFRM_TYPE_NON_FRAGMENT 1
272 int (*init_state)(struct xfrm_state *x);
273 void (*destructor)(struct xfrm_state *);
274 int (*input)(struct xfrm_state *, struct sk_buff *skb);
275 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
276 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
277 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
278 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
279 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
280 /* Estimate maximal size of result of transformation of a dgram */
281 u32 (*get_max_size)(struct xfrm_state *, int size);
284 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
285 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
286 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
287 extern void xfrm_put_type(struct xfrm_type *type);
290 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
291 int (*output)(struct sk_buff *skb);
293 struct module *owner;
297 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
298 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
299 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
300 extern void xfrm_put_mode(struct xfrm_mode *mode);
304 /* id in template is interpreted as:
305 * daddr - destination of tunnel, may be zero for transport mode.
306 * spi - zero to acquire spi. Not zero if spi is static, then
307 * daddr must be fixed too.
308 * proto - AH/ESP/IPCOMP
312 /* Source address of tunnel. Ignored, if it is not a tunnel. */
313 xfrm_address_t saddr;
317 /* Mode: transport, tunnel etc. */
320 /* Sharing mode: unique, this session only, this user only etc. */
323 /* May skip this transfomration if no SA is found */
326 /* Bit mask of algos allowed for acquisition */
332 #define XFRM_MAX_DEPTH 6
336 struct xfrm_policy *next;
337 struct list_head list;
339 /* This lock only affects elements except for entry. */
342 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);
391 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
393 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
395 if (likely(policy != NULL))
396 atomic_inc(&policy->refcnt);
399 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
401 static inline void xfrm_pol_put(struct xfrm_policy *policy)
403 if (atomic_dec_and_test(&policy->refcnt))
404 __xfrm_policy_destroy(policy);
407 #define XFRM_DST_HSIZE 1024
410 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
414 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
419 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
422 h = ntohl(addr->a6[2]^addr->a6[3]);
423 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
428 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
432 return __xfrm4_dst_hash(addr);
434 return __xfrm6_dst_hash(addr);
440 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
442 return __xfrm4_dst_hash(addr);
446 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
448 return __xfrm6_dst_hash(addr);
452 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
456 return __xfrm4_src_hash(addr);
458 return __xfrm6_src_hash(addr);
464 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
467 h = ntohl(addr->a4^spi^proto);
468 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
473 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
476 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
477 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
482 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
486 return __xfrm4_spi_hash(addr, spi, proto);
488 return __xfrm6_spi_hash(addr, spi, proto);
493 extern void __xfrm_state_destroy(struct xfrm_state *);
495 static inline void __xfrm_state_put(struct xfrm_state *x)
497 atomic_dec(&x->refcnt);
500 static inline void xfrm_state_put(struct xfrm_state *x)
502 if (atomic_dec_and_test(&x->refcnt))
503 __xfrm_state_destroy(x);
506 static inline void xfrm_state_hold(struct xfrm_state *x)
508 atomic_inc(&x->refcnt);
511 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
518 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
519 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
522 if (memcmp(a1, a2, pdw << 2))
528 mask = htonl((0xffffffff) << (32 - pbi));
530 if ((a1[pdw] ^ a2[pdw]) & mask)
538 u16 xfrm_flowi_sport(struct flowi *fl)
545 port = fl->fl_ip_sport;
549 port = htons(fl->fl_icmp_type);
551 #ifdef CONFIG_IPV6_MIP6
553 port = htons(fl->fl_mh_type);
563 u16 xfrm_flowi_dport(struct flowi *fl)
570 port = fl->fl_ip_dport;
574 port = htons(fl->fl_icmp_code);
583 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
585 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
586 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
587 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
588 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
589 (fl->proto == sel->proto || !sel->proto) &&
590 (fl->oif == sel->ifindex || !sel->ifindex);
594 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
596 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
597 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
598 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
599 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
600 (fl->proto == sel->proto || !sel->proto) &&
601 (fl->oif == sel->ifindex || !sel->ifindex);
605 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
606 unsigned short family)
610 return __xfrm4_selector_match(sel, fl);
612 return __xfrm6_selector_match(sel, fl);
617 #ifdef CONFIG_SECURITY_NETWORK_XFRM
618 /* If neither has a context --> match
619 * Otherwise, both must have a context and the sids, doi, alg must match
621 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
623 return ((!s1 && !s2) ||
625 (s1->ctx_sid == s2->ctx_sid) &&
626 (s1->ctx_doi == s2->ctx_doi) &&
627 (s1->ctx_alg == s2->ctx_alg)));
630 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
636 /* A struct encoding bundle of transformations to apply to some set of flow.
638 * dst->child points to the next element of bundle.
639 * dst->xfrm points to an instanse of transformer.
641 * Due to unfortunate limitations of current routing cache, which we
642 * have no time to fix, it mirrors struct rtable and bound to the same
643 * routing key, including saddr,daddr. However, we can have many of
644 * bundles differing by session id. All the bundles grow from a parent
650 struct xfrm_dst *next;
651 struct dst_entry dst;
655 struct dst_entry *route;
656 u32 route_mtu_cached;
657 u32 child_mtu_cached;
662 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
664 dst_release(xdst->route);
665 if (likely(xdst->u.dst.xfrm))
666 xfrm_state_put(xdst->u.dst.xfrm);
669 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
675 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
678 static inline struct sec_path *
679 secpath_get(struct sec_path *sp)
682 atomic_inc(&sp->refcnt);
686 extern void __secpath_destroy(struct sec_path *sp);
689 secpath_put(struct sec_path *sp)
691 if (sp && atomic_dec_and_test(&sp->refcnt))
692 __secpath_destroy(sp);
695 extern struct sec_path *secpath_dup(struct sec_path *src);
698 secpath_reset(struct sk_buff *skb)
701 secpath_put(skb->sp);
707 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
709 return (tmpl->saddr.a4 &&
710 tmpl->saddr.a4 != x->props.saddr.a4);
714 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
716 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
717 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
721 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
725 return __xfrm4_state_addr_cmp(tmpl, x);
727 return __xfrm6_state_addr_cmp(tmpl, x);
734 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
736 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
738 if (sk && sk->sk_policy[XFRM_POLICY_IN])
739 return __xfrm_policy_check(sk, dir, skb, family);
741 return (!xfrm_policy_list[dir] && !skb->sp) ||
742 (skb->dst->flags & DST_NOPOLICY) ||
743 __xfrm_policy_check(sk, dir, skb, family);
746 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
748 return xfrm_policy_check(sk, dir, skb, AF_INET);
751 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
753 return xfrm_policy_check(sk, dir, skb, AF_INET6);
756 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
757 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
759 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
761 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
762 (skb->dst->flags & DST_NOXFRM) ||
763 __xfrm_route_forward(skb, family);
766 static inline int xfrm4_route_forward(struct sk_buff *skb)
768 return xfrm_route_forward(skb, AF_INET);
771 static inline int xfrm6_route_forward(struct sk_buff *skb)
773 return xfrm_route_forward(skb, AF_INET6);
776 extern int __xfrm_sk_clone_policy(struct sock *sk);
778 static inline int xfrm_sk_clone_policy(struct sock *sk)
780 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
781 return __xfrm_sk_clone_policy(sk);
785 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
787 static inline void xfrm_sk_free_policy(struct sock *sk)
789 if (unlikely(sk->sk_policy[0] != NULL)) {
790 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
791 sk->sk_policy[0] = NULL;
793 if (unlikely(sk->sk_policy[1] != NULL)) {
794 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
795 sk->sk_policy[1] = NULL;
801 static inline void xfrm_sk_free_policy(struct sock *sk) {}
802 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
803 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
804 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
805 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
809 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
813 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
820 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
824 return (xfrm_address_t *)&fl->fl4_dst;
826 return (xfrm_address_t *)&fl->fl6_dst;
832 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
836 return (xfrm_address_t *)&fl->fl4_src;
838 return (xfrm_address_t *)&fl->fl6_src;
843 static __inline__ int
844 __xfrm4_state_addr_check(struct xfrm_state *x,
845 xfrm_address_t *daddr, xfrm_address_t *saddr)
847 if (daddr->a4 == x->id.daddr.a4 &&
848 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
853 static __inline__ int
854 __xfrm6_state_addr_check(struct xfrm_state *x,
855 xfrm_address_t *daddr, xfrm_address_t *saddr)
857 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
858 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
859 ipv6_addr_any((struct in6_addr *)saddr) ||
860 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
865 static __inline__ int
866 xfrm_state_addr_check(struct xfrm_state *x,
867 xfrm_address_t *daddr, xfrm_address_t *saddr,
868 unsigned short family)
872 return __xfrm4_state_addr_check(x, daddr, saddr);
874 return __xfrm6_state_addr_check(x, daddr, saddr);
879 static __inline__ int
880 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
881 unsigned short family)
885 return __xfrm4_state_addr_check(x,
886 (xfrm_address_t *)&fl->fl4_dst,
887 (xfrm_address_t *)&fl->fl4_src);
889 return __xfrm6_state_addr_check(x,
890 (xfrm_address_t *)&fl->fl6_dst,
891 (xfrm_address_t *)&fl->fl6_src);
896 static inline int xfrm_state_kern(struct xfrm_state *x)
898 return atomic_read(&x->tunnel_users);
901 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
903 return (!userproto || proto == userproto ||
904 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
905 proto == IPPROTO_ESP ||
906 proto == IPPROTO_COMP)));
910 * xfrm algorithm information
912 struct xfrm_algo_auth_info {
917 struct xfrm_algo_encr_info {
922 struct xfrm_algo_comp_info {
926 struct xfrm_algo_desc {
931 struct xfrm_algo_auth_info auth;
932 struct xfrm_algo_encr_info encr;
933 struct xfrm_algo_comp_info comp;
935 struct sadb_alg desc;
938 /* XFRM tunnel handlers. */
940 int (*handler)(struct sk_buff *skb);
941 int (*err_handler)(struct sk_buff *skb, __u32 info);
943 struct xfrm_tunnel *next;
947 struct xfrm6_tunnel {
948 int (*handler)(struct sk_buff *skb);
949 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
950 int type, int code, int offset, __u32 info);
952 struct xfrm6_tunnel *next;
956 extern void xfrm_init(void);
957 extern void xfrm4_init(void);
958 extern void xfrm6_init(void);
959 extern void xfrm6_fini(void);
960 extern void xfrm_state_init(void);
961 extern void xfrm4_state_init(void);
962 extern void xfrm6_state_init(void);
963 extern void xfrm6_state_fini(void);
965 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
966 extern struct xfrm_state *xfrm_state_alloc(void);
967 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
968 struct flowi *fl, struct xfrm_tmpl *tmpl,
969 struct xfrm_policy *pol, int *err,
970 unsigned short family);
971 extern int xfrm_state_check_expire(struct xfrm_state *x);
972 extern void xfrm_state_insert(struct xfrm_state *x);
973 extern int xfrm_state_add(struct xfrm_state *x);
974 extern int xfrm_state_update(struct xfrm_state *x);
975 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
976 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
977 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
978 extern int xfrm_state_delete(struct xfrm_state *x);
979 extern void xfrm_state_flush(u8 proto);
980 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
981 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
982 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
983 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
984 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
985 extern int xfrm_init_state(struct xfrm_state *x);
986 extern int xfrm4_rcv(struct sk_buff *skb);
987 extern int xfrm4_output(struct sk_buff *skb);
988 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
989 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
990 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
991 extern int xfrm6_rcv(struct sk_buff **pskb);
992 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
993 xfrm_address_t *saddr, u8 proto);
994 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
995 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
996 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
997 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
998 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
999 extern int xfrm6_output(struct sk_buff *skb);
1000 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1004 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
1005 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1006 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1008 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1010 return -ENOPROTOOPT;
1013 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
1015 /* should not happen */
1019 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1025 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1026 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
1027 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1028 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
1029 struct xfrm_sec_ctx *ctx, int delete);
1030 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
1031 void xfrm_policy_flush(void);
1032 u32 xfrm_get_acqseq(void);
1033 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1034 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1035 xfrm_address_t *daddr, xfrm_address_t *saddr,
1036 int create, unsigned short family);
1037 extern void xfrm_policy_flush(void);
1038 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1039 extern int xfrm_flush_bundles(void);
1040 extern void xfrm_flush_all_bundles(void);
1041 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family, int strict);
1042 extern void xfrm_init_pmtu(struct dst_entry *dst);
1044 extern wait_queue_head_t km_waitq;
1045 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1046 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1047 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1049 extern void xfrm_input_init(void);
1050 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1052 extern void xfrm_probe_algs(void);
1053 extern int xfrm_count_auth_supported(void);
1054 extern int xfrm_count_enc_supported(void);
1055 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1056 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1057 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1058 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1059 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1060 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1061 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1062 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1066 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1069 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1070 int offset, int len, icv_update_fn_t icv_update);
1072 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1078 return a->a4 - b->a4;
1080 return ipv6_addr_cmp((struct in6_addr *)a,
1081 (struct in6_addr *)b);
1085 static inline int xfrm_policy_id2dir(u32 index)
1090 static inline int xfrm_aevent_is_on(void)
1096 nlsk = rcu_dereference(xfrm_nl);
1098 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1103 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1105 if (xfrm_aevent_is_on())
1106 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1110 #endif /* _NET_XFRM_H */