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;
170 /* Reference to data common to all the instances of this
172 struct xfrm_type *type;
173 struct xfrm_mode *mode;
175 /* Security context */
176 struct xfrm_sec_ctx *security;
178 /* Private data of this transformer, format is opaque,
179 * interpreted by xfrm_type methods. */
183 /* xflags - make enum if more show up */
184 #define XFRM_TIME_DEFER 1
195 /* callback structure passed from either netlink or pfkey */
212 struct xfrm_policy_afinfo {
213 unsigned short family;
214 struct xfrm_type *type_map[IPPROTO_MAX];
215 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
216 struct dst_ops *dst_ops;
217 void (*garbage_collect)(void);
218 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
219 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
220 int (*bundle_create)(struct xfrm_policy *policy,
221 struct xfrm_state **xfrm,
224 struct dst_entry **dst_p);
225 void (*decode_session)(struct sk_buff *skb,
229 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
230 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
231 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
232 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
233 #define XFRM_ACQ_EXPIRES 30
236 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
237 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
238 extern int __xfrm_state_delete(struct xfrm_state *x);
240 struct xfrm_state_afinfo {
241 unsigned short family;
242 struct list_head *state_bydst;
243 struct list_head *state_bysrc;
244 struct list_head *state_byspi;
245 int (*init_flags)(struct xfrm_state *x);
246 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
247 struct xfrm_tmpl *tmpl,
248 xfrm_address_t *daddr, xfrm_address_t *saddr);
249 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
250 struct xfrm_state *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
251 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
252 xfrm_address_t *daddr, xfrm_address_t *saddr,
256 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
257 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
259 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
264 struct module *owner;
267 #define XFRM_TYPE_NON_FRAGMENT 1
269 int (*init_state)(struct xfrm_state *x);
270 void (*destructor)(struct xfrm_state *);
271 int (*input)(struct xfrm_state *, struct sk_buff *skb);
272 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
273 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
274 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
275 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
276 /* Estimate maximal size of result of transformation of a dgram */
277 u32 (*get_max_size)(struct xfrm_state *, int size);
280 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
281 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
282 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
283 extern void xfrm_put_type(struct xfrm_type *type);
286 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
287 int (*output)(struct sk_buff *skb);
289 struct module *owner;
293 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
294 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
295 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
296 extern void xfrm_put_mode(struct xfrm_mode *mode);
300 /* id in template is interpreted as:
301 * daddr - destination of tunnel, may be zero for transport mode.
302 * spi - zero to acquire spi. Not zero if spi is static, then
303 * daddr must be fixed too.
304 * proto - AH/ESP/IPCOMP
308 /* Source address of tunnel. Ignored, if it is not a tunnel. */
309 xfrm_address_t saddr;
313 /* Mode: transport, tunnel etc. */
316 /* Sharing mode: unique, this session only, this user only etc. */
319 /* May skip this transfomration if no SA is found */
322 /* Bit mask of algos allowed for acquisition */
328 #define XFRM_MAX_DEPTH 6
332 struct xfrm_policy *next;
333 struct list_head list;
335 /* This lock only affects elements except for entry. */
338 struct timer_list timer;
342 struct xfrm_selector selector;
343 struct xfrm_lifetime_cfg lft;
344 struct xfrm_lifetime_cur curlft;
345 struct dst_entry *bundles;
351 struct xfrm_sec_ctx *security;
352 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
355 #define XFRM_KM_TIMEOUT 30
357 #define XFRM_REPLAY_SEQ 1
358 #define XFRM_REPLAY_OSEQ 2
359 #define XFRM_REPLAY_SEQ_MASK 3
361 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
362 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
364 /* default aevent timeout in units of 100ms */
365 #define XFRM_AE_ETIME 10
366 /* Async Event timer multiplier */
367 #define XFRM_AE_ETH_M 10
368 /* default seq threshold size */
369 #define XFRM_AE_SEQT_SIZE 2
373 struct list_head list;
375 int (*notify)(struct xfrm_state *x, struct km_event *c);
376 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
377 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
378 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
379 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
382 extern int xfrm_register_km(struct xfrm_mgr *km);
383 extern int xfrm_unregister_km(struct xfrm_mgr *km);
386 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
388 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
390 if (likely(policy != NULL))
391 atomic_inc(&policy->refcnt);
394 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
396 static inline void xfrm_pol_put(struct xfrm_policy *policy)
398 if (atomic_dec_and_test(&policy->refcnt))
399 __xfrm_policy_destroy(policy);
402 #define XFRM_DST_HSIZE 1024
405 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
409 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
414 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
417 h = ntohl(addr->a6[2]^addr->a6[3]);
418 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
423 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
427 return __xfrm4_dst_hash(addr);
429 return __xfrm6_dst_hash(addr);
435 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
437 return __xfrm4_dst_hash(addr);
441 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
443 return __xfrm6_dst_hash(addr);
447 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
451 return __xfrm4_src_hash(addr);
453 return __xfrm6_src_hash(addr);
459 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
462 h = ntohl(addr->a4^spi^proto);
463 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
468 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
471 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
472 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
477 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
481 return __xfrm4_spi_hash(addr, spi, proto);
483 return __xfrm6_spi_hash(addr, spi, proto);
488 extern void __xfrm_state_destroy(struct xfrm_state *);
490 static inline void __xfrm_state_put(struct xfrm_state *x)
492 atomic_dec(&x->refcnt);
495 static inline void xfrm_state_put(struct xfrm_state *x)
497 if (atomic_dec_and_test(&x->refcnt))
498 __xfrm_state_destroy(x);
501 static inline void xfrm_state_hold(struct xfrm_state *x)
503 atomic_inc(&x->refcnt);
506 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
513 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
514 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
517 if (memcmp(a1, a2, pdw << 2))
523 mask = htonl((0xffffffff) << (32 - pbi));
525 if ((a1[pdw] ^ a2[pdw]) & mask)
533 u16 xfrm_flowi_sport(struct flowi *fl)
540 port = fl->fl_ip_sport;
544 port = htons(fl->fl_icmp_type);
553 u16 xfrm_flowi_dport(struct flowi *fl)
560 port = fl->fl_ip_dport;
564 port = htons(fl->fl_icmp_code);
573 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
575 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
576 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
577 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
578 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
579 (fl->proto == sel->proto || !sel->proto) &&
580 (fl->oif == sel->ifindex || !sel->ifindex);
584 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
586 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
587 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
588 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
589 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
590 (fl->proto == sel->proto || !sel->proto) &&
591 (fl->oif == sel->ifindex || !sel->ifindex);
595 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
596 unsigned short family)
600 return __xfrm4_selector_match(sel, fl);
602 return __xfrm6_selector_match(sel, fl);
607 #ifdef CONFIG_SECURITY_NETWORK_XFRM
608 /* If neither has a context --> match
609 * Otherwise, both must have a context and the sids, doi, alg must match
611 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
613 return ((!s1 && !s2) ||
615 (s1->ctx_sid == s2->ctx_sid) &&
616 (s1->ctx_doi == s2->ctx_doi) &&
617 (s1->ctx_alg == s2->ctx_alg)));
620 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
626 /* A struct encoding bundle of transformations to apply to some set of flow.
628 * dst->child points to the next element of bundle.
629 * dst->xfrm points to an instanse of transformer.
631 * Due to unfortunate limitations of current routing cache, which we
632 * have no time to fix, it mirrors struct rtable and bound to the same
633 * routing key, including saddr,daddr. However, we can have many of
634 * bundles differing by session id. All the bundles grow from a parent
640 struct xfrm_dst *next;
641 struct dst_entry dst;
645 struct dst_entry *route;
646 u32 route_mtu_cached;
647 u32 child_mtu_cached;
652 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
654 dst_release(xdst->route);
655 if (likely(xdst->u.dst.xfrm))
656 xfrm_state_put(xdst->u.dst.xfrm);
659 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
665 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
668 static inline struct sec_path *
669 secpath_get(struct sec_path *sp)
672 atomic_inc(&sp->refcnt);
676 extern void __secpath_destroy(struct sec_path *sp);
679 secpath_put(struct sec_path *sp)
681 if (sp && atomic_dec_and_test(&sp->refcnt))
682 __secpath_destroy(sp);
685 extern struct sec_path *secpath_dup(struct sec_path *src);
688 secpath_reset(struct sk_buff *skb)
691 secpath_put(skb->sp);
697 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
699 return (tmpl->saddr.a4 &&
700 tmpl->saddr.a4 != x->props.saddr.a4);
704 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
706 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
707 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
711 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
715 return __xfrm4_state_addr_cmp(tmpl, x);
717 return __xfrm6_state_addr_cmp(tmpl, x);
724 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
726 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
728 if (sk && sk->sk_policy[XFRM_POLICY_IN])
729 return __xfrm_policy_check(sk, dir, skb, family);
731 return (!xfrm_policy_list[dir] && !skb->sp) ||
732 (skb->dst->flags & DST_NOPOLICY) ||
733 __xfrm_policy_check(sk, dir, skb, family);
736 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
738 return xfrm_policy_check(sk, dir, skb, AF_INET);
741 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
743 return xfrm_policy_check(sk, dir, skb, AF_INET6);
746 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
747 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
749 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
751 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
752 (skb->dst->flags & DST_NOXFRM) ||
753 __xfrm_route_forward(skb, family);
756 static inline int xfrm4_route_forward(struct sk_buff *skb)
758 return xfrm_route_forward(skb, AF_INET);
761 static inline int xfrm6_route_forward(struct sk_buff *skb)
763 return xfrm_route_forward(skb, AF_INET6);
766 extern int __xfrm_sk_clone_policy(struct sock *sk);
768 static inline int xfrm_sk_clone_policy(struct sock *sk)
770 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
771 return __xfrm_sk_clone_policy(sk);
775 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
777 static inline void xfrm_sk_free_policy(struct sock *sk)
779 if (unlikely(sk->sk_policy[0] != NULL)) {
780 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
781 sk->sk_policy[0] = NULL;
783 if (unlikely(sk->sk_policy[1] != NULL)) {
784 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
785 sk->sk_policy[1] = NULL;
791 static inline void xfrm_sk_free_policy(struct sock *sk) {}
792 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
793 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
794 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
795 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
799 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
803 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
810 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
814 return (xfrm_address_t *)&fl->fl4_dst;
816 return (xfrm_address_t *)&fl->fl6_dst;
822 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
826 return (xfrm_address_t *)&fl->fl4_src;
828 return (xfrm_address_t *)&fl->fl6_src;
833 static __inline__ int
834 __xfrm4_state_addr_check(struct xfrm_state *x,
835 xfrm_address_t *daddr, xfrm_address_t *saddr)
837 if (daddr->a4 == x->id.daddr.a4 &&
838 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
843 static __inline__ int
844 __xfrm6_state_addr_check(struct xfrm_state *x,
845 xfrm_address_t *daddr, xfrm_address_t *saddr)
847 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
848 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
849 ipv6_addr_any((struct in6_addr *)saddr) ||
850 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
855 static __inline__ int
856 xfrm_state_addr_check(struct xfrm_state *x,
857 xfrm_address_t *daddr, xfrm_address_t *saddr,
858 unsigned short family)
862 return __xfrm4_state_addr_check(x, daddr, saddr);
864 return __xfrm6_state_addr_check(x, daddr, saddr);
869 static inline int xfrm_state_kern(struct xfrm_state *x)
871 return atomic_read(&x->tunnel_users);
874 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
876 return (!userproto || proto == userproto ||
877 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
878 proto == IPPROTO_ESP ||
879 proto == IPPROTO_COMP)));
883 * xfrm algorithm information
885 struct xfrm_algo_auth_info {
890 struct xfrm_algo_encr_info {
895 struct xfrm_algo_comp_info {
899 struct xfrm_algo_desc {
904 struct xfrm_algo_auth_info auth;
905 struct xfrm_algo_encr_info encr;
906 struct xfrm_algo_comp_info comp;
908 struct sadb_alg desc;
911 /* XFRM tunnel handlers. */
913 int (*handler)(struct sk_buff *skb);
914 int (*err_handler)(struct sk_buff *skb, __u32 info);
916 struct xfrm_tunnel *next;
920 struct xfrm6_tunnel {
921 int (*handler)(struct sk_buff *skb);
922 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
923 int type, int code, int offset, __u32 info);
925 struct xfrm6_tunnel *next;
929 extern void xfrm_init(void);
930 extern void xfrm4_init(void);
931 extern void xfrm6_init(void);
932 extern void xfrm6_fini(void);
933 extern void xfrm_state_init(void);
934 extern void xfrm4_state_init(void);
935 extern void xfrm6_state_init(void);
936 extern void xfrm6_state_fini(void);
938 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
939 extern struct xfrm_state *xfrm_state_alloc(void);
940 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
941 struct flowi *fl, struct xfrm_tmpl *tmpl,
942 struct xfrm_policy *pol, int *err,
943 unsigned short family);
944 extern int xfrm_state_check_expire(struct xfrm_state *x);
945 extern void xfrm_state_insert(struct xfrm_state *x);
946 extern int xfrm_state_add(struct xfrm_state *x);
947 extern int xfrm_state_update(struct xfrm_state *x);
948 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
949 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
950 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
951 extern int xfrm_state_delete(struct xfrm_state *x);
952 extern void xfrm_state_flush(u8 proto);
953 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
954 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
955 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
956 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
957 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
958 extern int xfrm_init_state(struct xfrm_state *x);
959 extern int xfrm4_rcv(struct sk_buff *skb);
960 extern int xfrm4_output(struct sk_buff *skb);
961 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
962 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
963 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
964 extern int xfrm6_rcv(struct sk_buff **pskb);
965 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
966 xfrm_address_t *saddr, u8 proto);
967 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
968 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
969 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
970 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
971 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
972 extern int xfrm6_output(struct sk_buff *skb);
973 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
977 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
978 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
979 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
981 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
986 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
988 /* should not happen */
992 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
998 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
999 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
1000 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1001 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
1002 struct xfrm_sec_ctx *ctx, int delete);
1003 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
1004 void xfrm_policy_flush(void);
1005 u32 xfrm_get_acqseq(void);
1006 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1007 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1008 xfrm_address_t *daddr, xfrm_address_t *saddr,
1009 int create, unsigned short family);
1010 extern void xfrm_policy_flush(void);
1011 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1012 extern int xfrm_flush_bundles(void);
1013 extern void xfrm_flush_all_bundles(void);
1014 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
1015 extern void xfrm_init_pmtu(struct dst_entry *dst);
1017 extern wait_queue_head_t km_waitq;
1018 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1019 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1021 extern void xfrm_input_init(void);
1022 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1024 extern void xfrm_probe_algs(void);
1025 extern int xfrm_count_auth_supported(void);
1026 extern int xfrm_count_enc_supported(void);
1027 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1028 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1029 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1030 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1031 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1032 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1033 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1034 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1038 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1041 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1042 int offset, int len, icv_update_fn_t icv_update);
1044 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1050 return a->a4 - b->a4;
1052 return ipv6_addr_cmp((struct in6_addr *)a,
1053 (struct in6_addr *)b);
1057 static inline int xfrm_policy_id2dir(u32 index)
1062 static inline int xfrm_aevent_is_on(void)
1068 nlsk = rcu_dereference(xfrm_nl);
1070 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1075 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1077 if (xfrm_aevent_is_on())
1078 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1082 #endif /* _NET_XFRM_H */