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 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
269 /* Estimate maximal size of result of transformation of a dgram */
270 u32 (*get_max_size)(struct xfrm_state *, int size);
273 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
274 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
275 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
276 extern void xfrm_put_type(struct xfrm_type *type);
279 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
280 int (*output)(struct sk_buff *skb);
282 struct module *owner;
286 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
287 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
288 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
289 extern void xfrm_put_mode(struct xfrm_mode *mode);
293 /* id in template is interpreted as:
294 * daddr - destination of tunnel, may be zero for transport mode.
295 * spi - zero to acquire spi. Not zero if spi is static, then
296 * daddr must be fixed too.
297 * proto - AH/ESP/IPCOMP
301 /* Source address of tunnel. Ignored, if it is not a tunnel. */
302 xfrm_address_t saddr;
306 /* Mode: transport, tunnel etc. */
309 /* Sharing mode: unique, this session only, this user only etc. */
312 /* May skip this transfomration if no SA is found */
315 /* Bit mask of algos allowed for acquisition */
321 #define XFRM_MAX_DEPTH 6
325 struct xfrm_policy *next;
326 struct list_head list;
328 /* This lock only affects elements except for entry. */
331 struct timer_list timer;
335 struct xfrm_selector selector;
336 struct xfrm_lifetime_cfg lft;
337 struct xfrm_lifetime_cur curlft;
338 struct dst_entry *bundles;
344 struct xfrm_sec_ctx *security;
345 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
348 #define XFRM_KM_TIMEOUT 30
350 #define XFRM_REPLAY_SEQ 1
351 #define XFRM_REPLAY_OSEQ 2
352 #define XFRM_REPLAY_SEQ_MASK 3
354 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
355 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
357 /* default aevent timeout in units of 100ms */
358 #define XFRM_AE_ETIME 10
359 /* Async Event timer multiplier */
360 #define XFRM_AE_ETH_M 10
361 /* default seq threshold size */
362 #define XFRM_AE_SEQT_SIZE 2
366 struct list_head list;
368 int (*notify)(struct xfrm_state *x, struct km_event *c);
369 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
370 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
371 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
372 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
375 extern int xfrm_register_km(struct xfrm_mgr *km);
376 extern int xfrm_unregister_km(struct xfrm_mgr *km);
379 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
381 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
383 if (likely(policy != NULL))
384 atomic_inc(&policy->refcnt);
387 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
389 static inline void xfrm_pol_put(struct xfrm_policy *policy)
391 if (atomic_dec_and_test(&policy->refcnt))
392 __xfrm_policy_destroy(policy);
395 #define XFRM_DST_HSIZE 1024
398 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
402 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
407 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
410 h = ntohl(addr->a6[2]^addr->a6[3]);
411 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
416 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
420 return __xfrm4_dst_hash(addr);
422 return __xfrm6_dst_hash(addr);
428 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
430 return __xfrm4_dst_hash(addr);
434 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
436 return __xfrm6_dst_hash(addr);
440 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
444 return __xfrm4_src_hash(addr);
446 return __xfrm6_src_hash(addr);
452 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
455 h = ntohl(addr->a4^spi^proto);
456 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
461 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
464 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
465 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
470 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
474 return __xfrm4_spi_hash(addr, spi, proto);
476 return __xfrm6_spi_hash(addr, spi, proto);
481 extern void __xfrm_state_destroy(struct xfrm_state *);
483 static inline void __xfrm_state_put(struct xfrm_state *x)
485 atomic_dec(&x->refcnt);
488 static inline void xfrm_state_put(struct xfrm_state *x)
490 if (atomic_dec_and_test(&x->refcnt))
491 __xfrm_state_destroy(x);
494 static inline void xfrm_state_hold(struct xfrm_state *x)
496 atomic_inc(&x->refcnt);
499 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
506 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
507 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
510 if (memcmp(a1, a2, pdw << 2))
516 mask = htonl((0xffffffff) << (32 - pbi));
518 if ((a1[pdw] ^ a2[pdw]) & mask)
526 u16 xfrm_flowi_sport(struct flowi *fl)
533 port = fl->fl_ip_sport;
537 port = htons(fl->fl_icmp_type);
546 u16 xfrm_flowi_dport(struct flowi *fl)
553 port = fl->fl_ip_dport;
557 port = htons(fl->fl_icmp_code);
566 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
568 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
569 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
570 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
571 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
572 (fl->proto == sel->proto || !sel->proto) &&
573 (fl->oif == sel->ifindex || !sel->ifindex);
577 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
579 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
580 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
581 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
582 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
583 (fl->proto == sel->proto || !sel->proto) &&
584 (fl->oif == sel->ifindex || !sel->ifindex);
588 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
589 unsigned short family)
593 return __xfrm4_selector_match(sel, fl);
595 return __xfrm6_selector_match(sel, fl);
600 #ifdef CONFIG_SECURITY_NETWORK_XFRM
601 /* If neither has a context --> match
602 * Otherwise, both must have a context and the sids, doi, alg must match
604 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
606 return ((!s1 && !s2) ||
608 (s1->ctx_sid == s2->ctx_sid) &&
609 (s1->ctx_doi == s2->ctx_doi) &&
610 (s1->ctx_alg == s2->ctx_alg)));
613 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
619 /* A struct encoding bundle of transformations to apply to some set of flow.
621 * dst->child points to the next element of bundle.
622 * dst->xfrm points to an instanse of transformer.
624 * Due to unfortunate limitations of current routing cache, which we
625 * have no time to fix, it mirrors struct rtable and bound to the same
626 * routing key, including saddr,daddr. However, we can have many of
627 * bundles differing by session id. All the bundles grow from a parent
633 struct xfrm_dst *next;
634 struct dst_entry dst;
638 struct dst_entry *route;
639 u32 route_mtu_cached;
640 u32 child_mtu_cached;
645 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
647 dst_release(xdst->route);
648 if (likely(xdst->u.dst.xfrm))
649 xfrm_state_put(xdst->u.dst.xfrm);
652 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
658 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
661 static inline struct sec_path *
662 secpath_get(struct sec_path *sp)
665 atomic_inc(&sp->refcnt);
669 extern void __secpath_destroy(struct sec_path *sp);
672 secpath_put(struct sec_path *sp)
674 if (sp && atomic_dec_and_test(&sp->refcnt))
675 __secpath_destroy(sp);
678 extern struct sec_path *secpath_dup(struct sec_path *src);
681 secpath_reset(struct sk_buff *skb)
684 secpath_put(skb->sp);
690 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
692 return (tmpl->saddr.a4 &&
693 tmpl->saddr.a4 != x->props.saddr.a4);
697 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
699 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
700 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
704 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
708 return __xfrm4_state_addr_cmp(tmpl, x);
710 return __xfrm6_state_addr_cmp(tmpl, x);
717 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
719 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
721 if (sk && sk->sk_policy[XFRM_POLICY_IN])
722 return __xfrm_policy_check(sk, dir, skb, family);
724 return (!xfrm_policy_list[dir] && !skb->sp) ||
725 (skb->dst->flags & DST_NOPOLICY) ||
726 __xfrm_policy_check(sk, dir, skb, family);
729 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
731 return xfrm_policy_check(sk, dir, skb, AF_INET);
734 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
736 return xfrm_policy_check(sk, dir, skb, AF_INET6);
739 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
740 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
742 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
744 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
745 (skb->dst->flags & DST_NOXFRM) ||
746 __xfrm_route_forward(skb, family);
749 static inline int xfrm4_route_forward(struct sk_buff *skb)
751 return xfrm_route_forward(skb, AF_INET);
754 static inline int xfrm6_route_forward(struct sk_buff *skb)
756 return xfrm_route_forward(skb, AF_INET6);
759 extern int __xfrm_sk_clone_policy(struct sock *sk);
761 static inline int xfrm_sk_clone_policy(struct sock *sk)
763 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
764 return __xfrm_sk_clone_policy(sk);
768 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
770 static inline void xfrm_sk_free_policy(struct sock *sk)
772 if (unlikely(sk->sk_policy[0] != NULL)) {
773 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
774 sk->sk_policy[0] = NULL;
776 if (unlikely(sk->sk_policy[1] != NULL)) {
777 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
778 sk->sk_policy[1] = NULL;
784 static inline void xfrm_sk_free_policy(struct sock *sk) {}
785 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
786 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
787 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
788 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
792 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
796 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
803 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
807 return (xfrm_address_t *)&fl->fl4_dst;
809 return (xfrm_address_t *)&fl->fl6_dst;
815 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
819 return (xfrm_address_t *)&fl->fl4_src;
821 return (xfrm_address_t *)&fl->fl6_src;
826 static __inline__ int
827 __xfrm4_state_addr_check(struct xfrm_state *x,
828 xfrm_address_t *daddr, xfrm_address_t *saddr)
830 if (daddr->a4 == x->id.daddr.a4 &&
831 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
836 static __inline__ int
837 __xfrm6_state_addr_check(struct xfrm_state *x,
838 xfrm_address_t *daddr, xfrm_address_t *saddr)
840 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
841 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
842 ipv6_addr_any((struct in6_addr *)saddr) ||
843 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
848 static __inline__ int
849 xfrm_state_addr_check(struct xfrm_state *x,
850 xfrm_address_t *daddr, xfrm_address_t *saddr,
851 unsigned short family)
855 return __xfrm4_state_addr_check(x, daddr, saddr);
857 return __xfrm6_state_addr_check(x, daddr, saddr);
862 static inline int xfrm_state_kern(struct xfrm_state *x)
864 return atomic_read(&x->tunnel_users);
867 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
869 return (!userproto || proto == userproto ||
870 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
871 proto == IPPROTO_ESP ||
872 proto == IPPROTO_COMP)));
876 * xfrm algorithm information
878 struct xfrm_algo_auth_info {
883 struct xfrm_algo_encr_info {
888 struct xfrm_algo_comp_info {
892 struct xfrm_algo_desc {
897 struct xfrm_algo_auth_info auth;
898 struct xfrm_algo_encr_info encr;
899 struct xfrm_algo_comp_info comp;
901 struct sadb_alg desc;
904 /* XFRM tunnel handlers. */
906 int (*handler)(struct sk_buff *skb);
907 int (*err_handler)(struct sk_buff *skb, __u32 info);
909 struct xfrm_tunnel *next;
913 struct xfrm6_tunnel {
914 int (*handler)(struct sk_buff *skb);
915 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
916 int type, int code, int offset, __u32 info);
918 struct xfrm6_tunnel *next;
922 extern void xfrm_init(void);
923 extern void xfrm4_init(void);
924 extern void xfrm6_init(void);
925 extern void xfrm6_fini(void);
926 extern void xfrm_state_init(void);
927 extern void xfrm4_state_init(void);
928 extern void xfrm6_state_init(void);
929 extern void xfrm6_state_fini(void);
931 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
932 extern struct xfrm_state *xfrm_state_alloc(void);
933 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
934 struct flowi *fl, struct xfrm_tmpl *tmpl,
935 struct xfrm_policy *pol, int *err,
936 unsigned short family);
937 extern int xfrm_state_check_expire(struct xfrm_state *x);
938 extern void xfrm_state_insert(struct xfrm_state *x);
939 extern int xfrm_state_add(struct xfrm_state *x);
940 extern int xfrm_state_update(struct xfrm_state *x);
941 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
942 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
943 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
944 extern int xfrm_state_delete(struct xfrm_state *x);
945 extern void xfrm_state_flush(u8 proto);
946 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
947 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
948 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
949 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
950 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
951 extern int xfrm_init_state(struct xfrm_state *x);
952 extern int xfrm4_rcv(struct sk_buff *skb);
953 extern int xfrm4_output(struct sk_buff *skb);
954 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
955 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
956 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
957 extern int xfrm6_rcv(struct sk_buff **pskb);
958 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
959 xfrm_address_t *saddr, u8 proto);
960 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
961 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
962 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
963 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
964 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
965 extern int xfrm6_output(struct sk_buff *skb);
966 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
970 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
971 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
972 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
974 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
979 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
981 /* should not happen */
985 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
991 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
992 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
993 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
994 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
995 struct xfrm_sec_ctx *ctx, int delete);
996 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
997 void xfrm_policy_flush(void);
998 u32 xfrm_get_acqseq(void);
999 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1000 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1001 xfrm_address_t *daddr, xfrm_address_t *saddr,
1002 int create, unsigned short family);
1003 extern void xfrm_policy_flush(void);
1004 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1005 extern int xfrm_flush_bundles(void);
1006 extern void xfrm_flush_all_bundles(void);
1007 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
1008 extern void xfrm_init_pmtu(struct dst_entry *dst);
1010 extern wait_queue_head_t km_waitq;
1011 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1012 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1014 extern void xfrm_input_init(void);
1015 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1017 extern void xfrm_probe_algs(void);
1018 extern int xfrm_count_auth_supported(void);
1019 extern int xfrm_count_enc_supported(void);
1020 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1021 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1022 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1023 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1024 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1025 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1026 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1027 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1031 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1034 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1035 int offset, int len, icv_update_fn_t icv_update);
1037 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1043 return a->a4 - b->a4;
1045 return ipv6_addr_cmp((struct in6_addr *)a,
1046 (struct in6_addr *)b);
1050 static inline int xfrm_policy_id2dir(u32 index)
1055 static inline int xfrm_aevent_is_on(void)
1061 nlsk = rcu_dereference(xfrm_nl);
1063 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1068 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1070 if (xfrm_aevent_is_on())
1071 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1075 #endif /* _NET_XFRM_H */