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 #define XFRM_TYPE_NON_FRAGMENT 1
266 int (*init_state
)(struct xfrm_state
*x
);
267 void (*destructor
)(struct xfrm_state
*);
268 int (*input
)(struct xfrm_state
*, struct sk_buff
*skb
);
269 int (*output
)(struct xfrm_state
*, struct sk_buff
*pskb
);
270 int (*hdr_offset
)(struct xfrm_state
*, struct sk_buff
*, u8
**);
271 xfrm_address_t
*(*local_addr
)(struct xfrm_state
*, xfrm_address_t
*);
272 xfrm_address_t
*(*remote_addr
)(struct xfrm_state
*, xfrm_address_t
*);
273 /* Estimate maximal size of result of transformation of a dgram */
274 u32 (*get_max_size
)(struct xfrm_state
*, int size
);
277 extern int xfrm_register_type(struct xfrm_type
*type
, unsigned short family
);
278 extern int xfrm_unregister_type(struct xfrm_type
*type
, unsigned short family
);
279 extern struct xfrm_type
*xfrm_get_type(u8 proto
, unsigned short family
);
280 extern void xfrm_put_type(struct xfrm_type
*type
);
283 int (*input
)(struct xfrm_state
*x
, struct sk_buff
*skb
);
284 int (*output
)(struct sk_buff
*skb
);
286 struct module
*owner
;
290 extern int xfrm_register_mode(struct xfrm_mode
*mode
, int family
);
291 extern int xfrm_unregister_mode(struct xfrm_mode
*mode
, int family
);
292 extern struct xfrm_mode
*xfrm_get_mode(unsigned int encap
, int family
);
293 extern void xfrm_put_mode(struct xfrm_mode
*mode
);
297 /* id in template is interpreted as:
298 * daddr - destination of tunnel, may be zero for transport mode.
299 * spi - zero to acquire spi. Not zero if spi is static, then
300 * daddr must be fixed too.
301 * proto - AH/ESP/IPCOMP
305 /* Source address of tunnel. Ignored, if it is not a tunnel. */
306 xfrm_address_t saddr
;
310 /* Mode: transport, tunnel etc. */
313 /* Sharing mode: unique, this session only, this user only etc. */
316 /* May skip this transfomration if no SA is found */
319 /* Bit mask of algos allowed for acquisition */
325 #define XFRM_MAX_DEPTH 6
329 struct xfrm_policy
*next
;
330 struct list_head list
;
332 /* This lock only affects elements except for entry. */
335 struct timer_list timer
;
339 struct xfrm_selector selector
;
340 struct xfrm_lifetime_cfg lft
;
341 struct xfrm_lifetime_cur curlft
;
342 struct dst_entry
*bundles
;
348 struct xfrm_sec_ctx
*security
;
349 struct xfrm_tmpl xfrm_vec
[XFRM_MAX_DEPTH
];
352 #define XFRM_KM_TIMEOUT 30
354 #define XFRM_REPLAY_SEQ 1
355 #define XFRM_REPLAY_OSEQ 2
356 #define XFRM_REPLAY_SEQ_MASK 3
358 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
359 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
361 /* default aevent timeout in units of 100ms */
362 #define XFRM_AE_ETIME 10
363 /* Async Event timer multiplier */
364 #define XFRM_AE_ETH_M 10
365 /* default seq threshold size */
366 #define XFRM_AE_SEQT_SIZE 2
370 struct list_head list
;
372 int (*notify
)(struct xfrm_state
*x
, struct km_event
*c
);
373 int (*acquire
)(struct xfrm_state
*x
, struct xfrm_tmpl
*, struct xfrm_policy
*xp
, int dir
);
374 struct xfrm_policy
*(*compile_policy
)(struct sock
*sk
, int opt
, u8
*data
, int len
, int *dir
);
375 int (*new_mapping
)(struct xfrm_state
*x
, xfrm_address_t
*ipaddr
, u16 sport
);
376 int (*notify_policy
)(struct xfrm_policy
*x
, int dir
, struct km_event
*c
);
379 extern int xfrm_register_km(struct xfrm_mgr
*km
);
380 extern int xfrm_unregister_km(struct xfrm_mgr
*km
);
383 extern struct xfrm_policy
*xfrm_policy_list
[XFRM_POLICY_MAX
*2];
385 static inline void xfrm_pol_hold(struct xfrm_policy
*policy
)
387 if (likely(policy
!= NULL
))
388 atomic_inc(&policy
->refcnt
);
391 extern void __xfrm_policy_destroy(struct xfrm_policy
*policy
);
393 static inline void xfrm_pol_put(struct xfrm_policy
*policy
)
395 if (atomic_dec_and_test(&policy
->refcnt
))
396 __xfrm_policy_destroy(policy
);
399 #define XFRM_DST_HSIZE 1024
402 unsigned __xfrm4_dst_hash(xfrm_address_t
*addr
)
406 h
= (h
^ (h
>>16)) % XFRM_DST_HSIZE
;
411 unsigned __xfrm6_dst_hash(xfrm_address_t
*addr
)
414 h
= ntohl(addr
->a6
[2]^addr
->a6
[3]);
415 h
= (h
^ (h
>>16)) % XFRM_DST_HSIZE
;
420 unsigned xfrm_dst_hash(xfrm_address_t
*addr
, unsigned short family
)
424 return __xfrm4_dst_hash(addr
);
426 return __xfrm6_dst_hash(addr
);
432 unsigned __xfrm4_src_hash(xfrm_address_t
*addr
)
434 return __xfrm4_dst_hash(addr
);
438 unsigned __xfrm6_src_hash(xfrm_address_t
*addr
)
440 return __xfrm6_dst_hash(addr
);
444 unsigned xfrm_src_hash(xfrm_address_t
*addr
, unsigned short family
)
448 return __xfrm4_src_hash(addr
);
450 return __xfrm6_src_hash(addr
);
456 unsigned __xfrm4_spi_hash(xfrm_address_t
*addr
, u32 spi
, u8 proto
)
459 h
= ntohl(addr
->a4
^spi
^proto
);
460 h
= (h
^ (h
>>10) ^ (h
>>20)) % XFRM_DST_HSIZE
;
465 unsigned __xfrm6_spi_hash(xfrm_address_t
*addr
, u32 spi
, u8 proto
)
468 h
= ntohl(addr
->a6
[2]^addr
->a6
[3]^spi
^proto
);
469 h
= (h
^ (h
>>10) ^ (h
>>20)) % XFRM_DST_HSIZE
;
474 unsigned xfrm_spi_hash(xfrm_address_t
*addr
, u32 spi
, u8 proto
, unsigned short family
)
478 return __xfrm4_spi_hash(addr
, spi
, proto
);
480 return __xfrm6_spi_hash(addr
, spi
, proto
);
485 extern void __xfrm_state_destroy(struct xfrm_state
*);
487 static inline void __xfrm_state_put(struct xfrm_state
*x
)
489 atomic_dec(&x
->refcnt
);
492 static inline void xfrm_state_put(struct xfrm_state
*x
)
494 if (atomic_dec_and_test(&x
->refcnt
))
495 __xfrm_state_destroy(x
);
498 static inline void xfrm_state_hold(struct xfrm_state
*x
)
500 atomic_inc(&x
->refcnt
);
503 static __inline__
int addr_match(void *token1
, void *token2
, int prefixlen
)
510 pdw
= prefixlen
>> 5; /* num of whole __u32 in prefix */
511 pbi
= prefixlen
& 0x1f; /* num of bits in incomplete u32 in prefix */
514 if (memcmp(a1
, a2
, pdw
<< 2))
520 mask
= htonl((0xffffffff) << (32 - pbi
));
522 if ((a1
[pdw
] ^ a2
[pdw
]) & mask
)
530 u16
xfrm_flowi_sport(struct flowi
*fl
)
537 port
= fl
->fl_ip_sport
;
541 port
= htons(fl
->fl_icmp_type
);
550 u16
xfrm_flowi_dport(struct flowi
*fl
)
557 port
= fl
->fl_ip_dport
;
561 port
= htons(fl
->fl_icmp_code
);
570 __xfrm4_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
)
572 return addr_match(&fl
->fl4_dst
, &sel
->daddr
, sel
->prefixlen_d
) &&
573 addr_match(&fl
->fl4_src
, &sel
->saddr
, sel
->prefixlen_s
) &&
574 !((xfrm_flowi_dport(fl
) ^ sel
->dport
) & sel
->dport_mask
) &&
575 !((xfrm_flowi_sport(fl
) ^ sel
->sport
) & sel
->sport_mask
) &&
576 (fl
->proto
== sel
->proto
|| !sel
->proto
) &&
577 (fl
->oif
== sel
->ifindex
|| !sel
->ifindex
);
581 __xfrm6_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
)
583 return addr_match(&fl
->fl6_dst
, &sel
->daddr
, sel
->prefixlen_d
) &&
584 addr_match(&fl
->fl6_src
, &sel
->saddr
, sel
->prefixlen_s
) &&
585 !((xfrm_flowi_dport(fl
) ^ sel
->dport
) & sel
->dport_mask
) &&
586 !((xfrm_flowi_sport(fl
) ^ sel
->sport
) & sel
->sport_mask
) &&
587 (fl
->proto
== sel
->proto
|| !sel
->proto
) &&
588 (fl
->oif
== sel
->ifindex
|| !sel
->ifindex
);
592 xfrm_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
,
593 unsigned short family
)
597 return __xfrm4_selector_match(sel
, fl
);
599 return __xfrm6_selector_match(sel
, fl
);
604 #ifdef CONFIG_SECURITY_NETWORK_XFRM
605 /* If neither has a context --> match
606 * Otherwise, both must have a context and the sids, doi, alg must match
608 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx
*s1
, struct xfrm_sec_ctx
*s2
)
610 return ((!s1
&& !s2
) ||
612 (s1
->ctx_sid
== s2
->ctx_sid
) &&
613 (s1
->ctx_doi
== s2
->ctx_doi
) &&
614 (s1
->ctx_alg
== s2
->ctx_alg
)));
617 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx
*s1
, struct xfrm_sec_ctx
*s2
)
623 /* A struct encoding bundle of transformations to apply to some set of flow.
625 * dst->child points to the next element of bundle.
626 * dst->xfrm points to an instanse of transformer.
628 * Due to unfortunate limitations of current routing cache, which we
629 * have no time to fix, it mirrors struct rtable and bound to the same
630 * routing key, including saddr,daddr. However, we can have many of
631 * bundles differing by session id. All the bundles grow from a parent
637 struct xfrm_dst
*next
;
638 struct dst_entry dst
;
642 struct dst_entry
*route
;
643 u32 route_mtu_cached
;
644 u32 child_mtu_cached
;
649 static inline void xfrm_dst_destroy(struct xfrm_dst
*xdst
)
651 dst_release(xdst
->route
);
652 if (likely(xdst
->u
.dst
.xfrm
))
653 xfrm_state_put(xdst
->u
.dst
.xfrm
);
656 extern void xfrm_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
);
662 struct xfrm_state
*xvec
[XFRM_MAX_DEPTH
];
665 static inline struct sec_path
*
666 secpath_get(struct sec_path
*sp
)
669 atomic_inc(&sp
->refcnt
);
673 extern void __secpath_destroy(struct sec_path
*sp
);
676 secpath_put(struct sec_path
*sp
)
678 if (sp
&& atomic_dec_and_test(&sp
->refcnt
))
679 __secpath_destroy(sp
);
682 extern struct sec_path
*secpath_dup(struct sec_path
*src
);
685 secpath_reset(struct sk_buff
*skb
)
688 secpath_put(skb
->sp
);
694 __xfrm4_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
)
696 return (tmpl
->saddr
.a4
&&
697 tmpl
->saddr
.a4
!= x
->props
.saddr
.a4
);
701 __xfrm6_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
)
703 return (!ipv6_addr_any((struct in6_addr
*)&tmpl
->saddr
) &&
704 ipv6_addr_cmp((struct in6_addr
*)&tmpl
->saddr
, (struct in6_addr
*)&x
->props
.saddr
));
708 xfrm_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
, unsigned short family
)
712 return __xfrm4_state_addr_cmp(tmpl
, x
);
714 return __xfrm6_state_addr_cmp(tmpl
, x
);
721 extern int __xfrm_policy_check(struct sock
*, int dir
, struct sk_buff
*skb
, unsigned short family
);
723 static inline int xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
, unsigned short family
)
725 if (sk
&& sk
->sk_policy
[XFRM_POLICY_IN
])
726 return __xfrm_policy_check(sk
, dir
, skb
, family
);
728 return (!xfrm_policy_list
[dir
] && !skb
->sp
) ||
729 (skb
->dst
->flags
& DST_NOPOLICY
) ||
730 __xfrm_policy_check(sk
, dir
, skb
, family
);
733 static inline int xfrm4_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
735 return xfrm_policy_check(sk
, dir
, skb
, AF_INET
);
738 static inline int xfrm6_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
740 return xfrm_policy_check(sk
, dir
, skb
, AF_INET6
);
743 extern int xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
, unsigned short family
);
744 extern int __xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
);
746 static inline int xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
)
748 return !xfrm_policy_list
[XFRM_POLICY_OUT
] ||
749 (skb
->dst
->flags
& DST_NOXFRM
) ||
750 __xfrm_route_forward(skb
, family
);
753 static inline int xfrm4_route_forward(struct sk_buff
*skb
)
755 return xfrm_route_forward(skb
, AF_INET
);
758 static inline int xfrm6_route_forward(struct sk_buff
*skb
)
760 return xfrm_route_forward(skb
, AF_INET6
);
763 extern int __xfrm_sk_clone_policy(struct sock
*sk
);
765 static inline int xfrm_sk_clone_policy(struct sock
*sk
)
767 if (unlikely(sk
->sk_policy
[0] || sk
->sk_policy
[1]))
768 return __xfrm_sk_clone_policy(sk
);
772 extern int xfrm_policy_delete(struct xfrm_policy
*pol
, int dir
);
774 static inline void xfrm_sk_free_policy(struct sock
*sk
)
776 if (unlikely(sk
->sk_policy
[0] != NULL
)) {
777 xfrm_policy_delete(sk
->sk_policy
[0], XFRM_POLICY_MAX
);
778 sk
->sk_policy
[0] = NULL
;
780 if (unlikely(sk
->sk_policy
[1] != NULL
)) {
781 xfrm_policy_delete(sk
->sk_policy
[1], XFRM_POLICY_MAX
+1);
782 sk
->sk_policy
[1] = NULL
;
788 static inline void xfrm_sk_free_policy(struct sock
*sk
) {}
789 static inline int xfrm_sk_clone_policy(struct sock
*sk
) { return 0; }
790 static inline int xfrm6_route_forward(struct sk_buff
*skb
) { return 1; }
791 static inline int xfrm4_route_forward(struct sk_buff
*skb
) { return 1; }
792 static inline int xfrm6_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
796 static inline int xfrm4_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
800 static inline int xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
, unsigned short family
)
807 xfrm_address_t
*xfrm_flowi_daddr(struct flowi
*fl
, unsigned short family
)
811 return (xfrm_address_t
*)&fl
->fl4_dst
;
813 return (xfrm_address_t
*)&fl
->fl6_dst
;
819 xfrm_address_t
*xfrm_flowi_saddr(struct flowi
*fl
, unsigned short family
)
823 return (xfrm_address_t
*)&fl
->fl4_src
;
825 return (xfrm_address_t
*)&fl
->fl6_src
;
830 static __inline__
int
831 __xfrm4_state_addr_check(struct xfrm_state
*x
,
832 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
)
834 if (daddr
->a4
== x
->id
.daddr
.a4
&&
835 (saddr
->a4
== x
->props
.saddr
.a4
|| !saddr
->a4
|| !x
->props
.saddr
.a4
))
840 static __inline__
int
841 __xfrm6_state_addr_check(struct xfrm_state
*x
,
842 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
)
844 if (!ipv6_addr_cmp((struct in6_addr
*)daddr
, (struct in6_addr
*)&x
->id
.daddr
) &&
845 (!ipv6_addr_cmp((struct in6_addr
*)saddr
, (struct in6_addr
*)&x
->props
.saddr
)||
846 ipv6_addr_any((struct in6_addr
*)saddr
) ||
847 ipv6_addr_any((struct in6_addr
*)&x
->props
.saddr
)))
852 static __inline__
int
853 xfrm_state_addr_check(struct xfrm_state
*x
,
854 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
855 unsigned short family
)
859 return __xfrm4_state_addr_check(x
, daddr
, saddr
);
861 return __xfrm6_state_addr_check(x
, daddr
, saddr
);
866 static inline int xfrm_state_kern(struct xfrm_state
*x
)
868 return atomic_read(&x
->tunnel_users
);
871 static inline int xfrm_id_proto_match(u8 proto
, u8 userproto
)
873 return (!userproto
|| proto
== userproto
||
874 (userproto
== IPSEC_PROTO_ANY
&& (proto
== IPPROTO_AH
||
875 proto
== IPPROTO_ESP
||
876 proto
== IPPROTO_COMP
)));
880 * xfrm algorithm information
882 struct xfrm_algo_auth_info
{
887 struct xfrm_algo_encr_info
{
892 struct xfrm_algo_comp_info
{
896 struct xfrm_algo_desc
{
901 struct xfrm_algo_auth_info auth
;
902 struct xfrm_algo_encr_info encr
;
903 struct xfrm_algo_comp_info comp
;
905 struct sadb_alg desc
;
908 /* XFRM tunnel handlers. */
910 int (*handler
)(struct sk_buff
*skb
);
911 int (*err_handler
)(struct sk_buff
*skb
, __u32 info
);
913 struct xfrm_tunnel
*next
;
917 struct xfrm6_tunnel
{
918 int (*handler
)(struct sk_buff
*skb
);
919 int (*err_handler
)(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
920 int type
, int code
, int offset
, __u32 info
);
922 struct xfrm6_tunnel
*next
;
926 extern void xfrm_init(void);
927 extern void xfrm4_init(void);
928 extern void xfrm6_init(void);
929 extern void xfrm6_fini(void);
930 extern void xfrm_state_init(void);
931 extern void xfrm4_state_init(void);
932 extern void xfrm6_state_init(void);
933 extern void xfrm6_state_fini(void);
935 extern int xfrm_state_walk(u8 proto
, int (*func
)(struct xfrm_state
*, int, void*), void *);
936 extern struct xfrm_state
*xfrm_state_alloc(void);
937 extern struct xfrm_state
*xfrm_state_find(xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
938 struct flowi
*fl
, struct xfrm_tmpl
*tmpl
,
939 struct xfrm_policy
*pol
, int *err
,
940 unsigned short family
);
941 extern int xfrm_state_check_expire(struct xfrm_state
*x
);
942 extern void xfrm_state_insert(struct xfrm_state
*x
);
943 extern int xfrm_state_add(struct xfrm_state
*x
);
944 extern int xfrm_state_update(struct xfrm_state
*x
);
945 extern struct xfrm_state
*xfrm_state_lookup(xfrm_address_t
*daddr
, u32 spi
, u8 proto
, unsigned short family
);
946 extern struct xfrm_state
*xfrm_state_lookup_byaddr(xfrm_address_t
*daddr
, xfrm_address_t
*saddr
, u8 proto
, unsigned short family
);
947 extern struct xfrm_state
*xfrm_find_acq_byseq(u32 seq
);
948 extern int xfrm_state_delete(struct xfrm_state
*x
);
949 extern void xfrm_state_flush(u8 proto
);
950 extern int xfrm_replay_check(struct xfrm_state
*x
, u32 seq
);
951 extern void xfrm_replay_advance(struct xfrm_state
*x
, u32 seq
);
952 extern void xfrm_replay_notify(struct xfrm_state
*x
, int event
);
953 extern int xfrm_state_check(struct xfrm_state
*x
, struct sk_buff
*skb
);
954 extern int xfrm_state_mtu(struct xfrm_state
*x
, int mtu
);
955 extern int xfrm_init_state(struct xfrm_state
*x
);
956 extern int xfrm4_rcv(struct sk_buff
*skb
);
957 extern int xfrm4_output(struct sk_buff
*skb
);
958 extern int xfrm4_tunnel_register(struct xfrm_tunnel
*handler
);
959 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel
*handler
);
960 extern int xfrm6_rcv_spi(struct sk_buff
*skb
, u32 spi
);
961 extern int xfrm6_rcv(struct sk_buff
**pskb
);
962 extern int xfrm6_input_addr(struct sk_buff
*skb
, xfrm_address_t
*daddr
,
963 xfrm_address_t
*saddr
, u8 proto
);
964 extern int xfrm6_tunnel_register(struct xfrm6_tunnel
*handler
);
965 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel
*handler
);
966 extern u32
xfrm6_tunnel_alloc_spi(xfrm_address_t
*saddr
);
967 extern void xfrm6_tunnel_free_spi(xfrm_address_t
*saddr
);
968 extern u32
xfrm6_tunnel_spi_lookup(xfrm_address_t
*saddr
);
969 extern int xfrm6_output(struct sk_buff
*skb
);
970 extern int xfrm6_find_1stfragopt(struct xfrm_state
*x
, struct sk_buff
*skb
,
974 extern int xfrm4_rcv_encap(struct sk_buff
*skb
, __u16 encap_type
);
975 extern int xfrm_user_policy(struct sock
*sk
, int optname
, u8 __user
*optval
, int optlen
);
976 extern int xfrm_dst_lookup(struct xfrm_dst
**dst
, struct flowi
*fl
, unsigned short family
);
978 static inline int xfrm_user_policy(struct sock
*sk
, int optname
, u8 __user
*optval
, int optlen
)
983 static inline int xfrm4_rcv_encap(struct sk_buff
*skb
, __u16 encap_type
)
985 /* should not happen */
989 static inline int xfrm_dst_lookup(struct xfrm_dst
**dst
, struct flowi
*fl
, unsigned short family
)
995 struct xfrm_policy
*xfrm_policy_alloc(gfp_t gfp
);
996 extern int xfrm_policy_walk(int (*func
)(struct xfrm_policy
*, int, int, void*), void *);
997 int xfrm_policy_insert(int dir
, struct xfrm_policy
*policy
, int excl
);
998 struct xfrm_policy
*xfrm_policy_bysel_ctx(int dir
, struct xfrm_selector
*sel
,
999 struct xfrm_sec_ctx
*ctx
, int delete);
1000 struct xfrm_policy
*xfrm_policy_byid(int dir
, u32 id
, int delete);
1001 void xfrm_policy_flush(void);
1002 u32
xfrm_get_acqseq(void);
1003 void xfrm_alloc_spi(struct xfrm_state
*x
, u32 minspi
, u32 maxspi
);
1004 struct xfrm_state
* xfrm_find_acq(u8 mode
, u32 reqid
, u8 proto
,
1005 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
1006 int create
, unsigned short family
);
1007 extern void xfrm_policy_flush(void);
1008 extern int xfrm_sk_policy_insert(struct sock
*sk
, int dir
, struct xfrm_policy
*pol
);
1009 extern int xfrm_flush_bundles(void);
1010 extern void xfrm_flush_all_bundles(void);
1011 extern int xfrm_bundle_ok(struct xfrm_dst
*xdst
, struct flowi
*fl
, int family
);
1012 extern void xfrm_init_pmtu(struct dst_entry
*dst
);
1014 extern wait_queue_head_t km_waitq
;
1015 extern int km_new_mapping(struct xfrm_state
*x
, xfrm_address_t
*ipaddr
, u16 sport
);
1016 extern void km_policy_expired(struct xfrm_policy
*pol
, int dir
, int hard
, u32 pid
);
1018 extern void xfrm_input_init(void);
1019 extern int xfrm_parse_spi(struct sk_buff
*skb
, u8 nexthdr
, u32
*spi
, u32
*seq
);
1021 extern void xfrm_probe_algs(void);
1022 extern int xfrm_count_auth_supported(void);
1023 extern int xfrm_count_enc_supported(void);
1024 extern struct xfrm_algo_desc
*xfrm_aalg_get_byidx(unsigned int idx
);
1025 extern struct xfrm_algo_desc
*xfrm_ealg_get_byidx(unsigned int idx
);
1026 extern struct xfrm_algo_desc
*xfrm_aalg_get_byid(int alg_id
);
1027 extern struct xfrm_algo_desc
*xfrm_ealg_get_byid(int alg_id
);
1028 extern struct xfrm_algo_desc
*xfrm_calg_get_byid(int alg_id
);
1029 extern struct xfrm_algo_desc
*xfrm_aalg_get_byname(char *name
, int probe
);
1030 extern struct xfrm_algo_desc
*xfrm_ealg_get_byname(char *name
, int probe
);
1031 extern struct xfrm_algo_desc
*xfrm_calg_get_byname(char *name
, int probe
);
1035 typedef int (icv_update_fn_t
)(struct hash_desc
*, struct scatterlist
*,
1038 extern int skb_icv_walk(const struct sk_buff
*skb
, struct hash_desc
*tfm
,
1039 int offset
, int len
, icv_update_fn_t icv_update
);
1041 static inline int xfrm_addr_cmp(xfrm_address_t
*a
, xfrm_address_t
*b
,
1047 return a
->a4
- b
->a4
;
1049 return ipv6_addr_cmp((struct in6_addr
*)a
,
1050 (struct in6_addr
*)b
);
1054 static inline int xfrm_policy_id2dir(u32 index
)
1059 static inline int xfrm_aevent_is_on(void)
1065 nlsk
= rcu_dereference(xfrm_nl
);
1067 ret
= netlink_has_listeners(nlsk
, XFRMNLGRP_AEVENTS
);
1072 static inline void xfrm_aevent_doreplay(struct xfrm_state
*x
)
1074 if (xfrm_aevent_is_on())
1075 xfrm_replay_notify(x
, XFRM_REPLAY_UPDATE
);
1079 #endif /* _NET_XFRM_H */