4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
19 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib
, xfrm_statistics
);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock
*xfrm_nl
;
52 extern u32 sysctl_xfrm_aevent_etime
;
53 extern u32 sysctl_xfrm_aevent_rseqth
;
54 extern int sysctl_xfrm_larval_drop
;
55 extern u32 sysctl_xfrm_acq_expires
;
57 extern struct mutex xfrm_cfg_mutex
;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 /* Note: bydst is re-used during gc */
124 struct hlist_node bydst
;
125 struct hlist_node bysrc
;
126 struct hlist_node byspi
;
132 struct xfrm_selector sel
;
136 /* Key manger bits */
143 /* Parameters of this state. */
148 u8 aalgo
, ealgo
, calgo
;
151 xfrm_address_t saddr
;
156 struct xfrm_lifetime_cfg lft
;
158 /* Data for transformer */
159 struct xfrm_algo
*aalg
;
160 struct xfrm_algo
*ealg
;
161 struct xfrm_algo
*calg
;
163 /* Data for encapsulator */
164 struct xfrm_encap_tmpl
*encap
;
166 /* Data for care-of address */
167 xfrm_address_t
*coaddr
;
169 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
170 struct xfrm_state
*tunnel
;
172 /* If a tunnel, number of users + 1 */
173 atomic_t tunnel_users
;
175 /* State for replay detection */
176 struct xfrm_replay_state replay
;
178 /* Replay detection state at the time we sent the last notification */
179 struct xfrm_replay_state preplay
;
181 /* internal flag that only holds state for delayed aevent at the
186 /* Replay detection notification settings */
190 /* Replay detection notification timer */
191 struct timer_list rtimer
;
194 struct xfrm_stats stats
;
196 struct xfrm_lifetime_cur curlft
;
197 struct timer_list timer
;
200 unsigned long lastused
;
202 /* Reference to data common to all the instances of this
204 struct xfrm_type
*type
;
205 struct xfrm_mode
*inner_mode
;
206 struct xfrm_mode
*outer_mode
;
208 /* Security context */
209 struct xfrm_sec_ctx
*security
;
211 /* Private data of this transformer, format is opaque,
212 * interpreted by xfrm_type methods. */
216 /* xflags - make enum if more show up */
217 #define XFRM_TIME_DEFER 1
228 /* callback structure passed from either netlink or pfkey */
247 struct xfrm_policy_afinfo
{
248 unsigned short family
;
249 struct dst_ops
*dst_ops
;
250 void (*garbage_collect
)(void);
251 struct dst_entry
*(*dst_lookup
)(int tos
, xfrm_address_t
*saddr
,
252 xfrm_address_t
*daddr
);
253 int (*get_saddr
)(xfrm_address_t
*saddr
, xfrm_address_t
*daddr
);
254 struct dst_entry
*(*find_bundle
)(struct flowi
*fl
, struct xfrm_policy
*policy
);
255 void (*decode_session
)(struct sk_buff
*skb
,
258 int (*get_tos
)(struct flowi
*fl
);
259 int (*init_path
)(struct xfrm_dst
*path
,
260 struct dst_entry
*dst
,
262 int (*fill_dst
)(struct xfrm_dst
*xdst
,
263 struct net_device
*dev
);
266 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo
*afinfo
);
267 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo
*afinfo
);
268 extern void km_policy_notify(struct xfrm_policy
*xp
, int dir
, struct km_event
*c
);
269 extern void km_state_notify(struct xfrm_state
*x
, struct km_event
*c
);
272 extern int km_query(struct xfrm_state
*x
, struct xfrm_tmpl
*t
, struct xfrm_policy
*pol
);
273 extern void km_state_expired(struct xfrm_state
*x
, int hard
, u32 pid
);
274 extern int __xfrm_state_delete(struct xfrm_state
*x
);
276 struct xfrm_state_afinfo
{
279 unsigned int eth_proto
;
280 struct module
*owner
;
281 struct xfrm_type
*type_map
[IPPROTO_MAX
];
282 struct xfrm_mode
*mode_map
[XFRM_MODE_MAX
];
283 int (*init_flags
)(struct xfrm_state
*x
);
284 void (*init_tempsel
)(struct xfrm_state
*x
, struct flowi
*fl
,
285 struct xfrm_tmpl
*tmpl
,
286 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
);
287 int (*tmpl_sort
)(struct xfrm_tmpl
**dst
, struct xfrm_tmpl
**src
, int n
);
288 int (*state_sort
)(struct xfrm_state
**dst
, struct xfrm_state
**src
, int n
);
289 int (*output
)(struct sk_buff
*skb
);
290 int (*extract_input
)(struct xfrm_state
*x
,
291 struct sk_buff
*skb
);
292 int (*extract_output
)(struct xfrm_state
*x
,
293 struct sk_buff
*skb
);
294 int (*transport_finish
)(struct sk_buff
*skb
,
298 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo
*afinfo
);
299 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo
*afinfo
);
301 extern void xfrm_state_delete_tunnel(struct xfrm_state
*x
);
306 struct module
*owner
;
309 #define XFRM_TYPE_NON_FRAGMENT 1
310 #define XFRM_TYPE_REPLAY_PROT 2
311 #define XFRM_TYPE_LOCAL_COADDR 4
312 #define XFRM_TYPE_REMOTE_COADDR 8
314 int (*init_state
)(struct xfrm_state
*x
);
315 void (*destructor
)(struct xfrm_state
*);
316 int (*input
)(struct xfrm_state
*, struct sk_buff
*skb
);
317 int (*output
)(struct xfrm_state
*, struct sk_buff
*pskb
);
318 int (*reject
)(struct xfrm_state
*, struct sk_buff
*, struct flowi
*);
319 int (*hdr_offset
)(struct xfrm_state
*, struct sk_buff
*, u8
**);
320 /* Estimate maximal size of result of transformation of a dgram */
321 u32 (*get_mtu
)(struct xfrm_state
*, int size
);
324 extern int xfrm_register_type(struct xfrm_type
*type
, unsigned short family
);
325 extern int xfrm_unregister_type(struct xfrm_type
*type
, unsigned short family
);
329 * Remove encapsulation header.
331 * The IP header will be moved over the top of the encapsulation
334 * On entry, the transport header shall point to where the IP header
335 * should be and the network header shall be set to where the IP
336 * header currently is. skb->data shall point to the start of the
339 int (*input2
)(struct xfrm_state
*x
, struct sk_buff
*skb
);
342 * This is the actual input entry point.
344 * For transport mode and equivalent this would be identical to
345 * input2 (which does not need to be set). While tunnel mode
346 * and equivalent would set this to the tunnel encapsulation function
347 * xfrm4_prepare_input that would in turn call input2.
349 int (*input
)(struct xfrm_state
*x
, struct sk_buff
*skb
);
352 * Add encapsulation header.
354 * On exit, the transport header will be set to the start of the
355 * encapsulation header to be filled in by x->type->output and
356 * the mac header will be set to the nextheader (protocol for
357 * IPv4) field of the extension header directly preceding the
358 * encapsulation header, or in its absence, that of the top IP
359 * header. The value of the network header will always point
360 * to the top IP header while skb->data will point to the payload.
362 int (*output2
)(struct xfrm_state
*x
,struct sk_buff
*skb
);
365 * This is the actual output entry point.
367 * For transport mode and equivalent this would be identical to
368 * output2 (which does not need to be set). While tunnel mode
369 * and equivalent would set this to a tunnel encapsulation function
370 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
373 int (*output
)(struct xfrm_state
*x
, struct sk_buff
*skb
);
375 struct xfrm_state_afinfo
*afinfo
;
376 struct module
*owner
;
381 /* Flags for xfrm_mode. */
383 XFRM_MODE_FLAG_TUNNEL
= 1,
386 extern int xfrm_register_mode(struct xfrm_mode
*mode
, int family
);
387 extern int xfrm_unregister_mode(struct xfrm_mode
*mode
, int family
);
391 /* id in template is interpreted as:
392 * daddr - destination of tunnel, may be zero for transport mode.
393 * spi - zero to acquire spi. Not zero if spi is static, then
394 * daddr must be fixed too.
395 * proto - AH/ESP/IPCOMP
399 /* Source address of tunnel. Ignored, if it is not a tunnel. */
400 xfrm_address_t saddr
;
402 unsigned short encap_family
;
406 /* Mode: transport, tunnel etc. */
409 /* Sharing mode: unique, this session only, this user only etc. */
412 /* May skip this transfomration if no SA is found */
415 /* Bit mask of algos allowed for acquisition */
421 #define XFRM_MAX_DEPTH 6
425 struct xfrm_policy
*next
;
426 struct hlist_node bydst
;
427 struct hlist_node byidx
;
429 /* This lock only affects elements except for entry. */
432 struct timer_list timer
;
436 struct xfrm_selector selector
;
437 struct xfrm_lifetime_cfg lft
;
438 struct xfrm_lifetime_cur curlft
;
439 struct dst_entry
*bundles
;
446 /* XXX 1 byte hole, try to pack */
447 struct xfrm_sec_ctx
*security
;
448 struct xfrm_tmpl xfrm_vec
[XFRM_MAX_DEPTH
];
451 struct xfrm_migrate
{
452 xfrm_address_t old_daddr
;
453 xfrm_address_t old_saddr
;
454 xfrm_address_t new_daddr
;
455 xfrm_address_t new_saddr
;
464 #define XFRM_KM_TIMEOUT 30
466 #define XFRM_REPLAY_SEQ 1
467 #define XFRM_REPLAY_OSEQ 2
468 #define XFRM_REPLAY_SEQ_MASK 3
470 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
471 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
473 /* default aevent timeout in units of 100ms */
474 #define XFRM_AE_ETIME 10
475 /* Async Event timer multiplier */
476 #define XFRM_AE_ETH_M 10
477 /* default seq threshold size */
478 #define XFRM_AE_SEQT_SIZE 2
482 struct list_head list
;
484 int (*notify
)(struct xfrm_state
*x
, struct km_event
*c
);
485 int (*acquire
)(struct xfrm_state
*x
, struct xfrm_tmpl
*, struct xfrm_policy
*xp
, int dir
);
486 struct xfrm_policy
*(*compile_policy
)(struct sock
*sk
, int opt
, u8
*data
, int len
, int *dir
);
487 int (*new_mapping
)(struct xfrm_state
*x
, xfrm_address_t
*ipaddr
, __be16 sport
);
488 int (*notify_policy
)(struct xfrm_policy
*x
, int dir
, struct km_event
*c
);
489 int (*report
)(u8 proto
, struct xfrm_selector
*sel
, xfrm_address_t
*addr
);
490 int (*migrate
)(struct xfrm_selector
*sel
, u8 dir
, u8 type
, struct xfrm_migrate
*m
, int num_bundles
);
493 extern int xfrm_register_km(struct xfrm_mgr
*km
);
494 extern int xfrm_unregister_km(struct xfrm_mgr
*km
);
496 extern unsigned int xfrm_policy_count
[XFRM_POLICY_MAX
*2];
499 * This structure is used for the duration where packets are being
500 * transformed by IPsec. As soon as the packet leaves IPsec the
501 * area beyond the generic IP part may be overwritten.
505 struct inet_skb_parm h4
;
506 struct inet6_skb_parm h6
;
509 /* Sequence number for replay protection. */
513 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
516 * This structure is used by the afinfo prepare_input/prepare_output functions
517 * to transmit header information to the mode input/output functions.
519 struct xfrm_mode_skb_cb
{
521 struct inet_skb_parm h4
;
522 struct inet6_skb_parm h6
;
525 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
529 /* TOS for IPv4, class for IPv6. */
532 /* TTL for IPv4, hop limitfor IPv6. */
535 /* Protocol for IPv4, NH for IPv6. */
538 /* Used by IPv6 only, zero for IPv4. */
542 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
545 * This structure is used by the input processing to locate the SPI and
546 * related information.
548 struct xfrm_spi_skb_cb
{
550 struct inet_skb_parm h4
;
551 struct inet6_skb_parm h6
;
554 unsigned int daddroff
;
558 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
560 /* Audit Information */
567 #ifdef CONFIG_AUDITSYSCALL
568 static inline struct audit_buffer
*xfrm_audit_start(u32 auid
, u32 sid
)
570 struct audit_buffer
*audit_buf
= NULL
;
574 audit_buf
= audit_log_start(current
->audit_context
, GFP_ATOMIC
,
575 AUDIT_MAC_IPSEC_EVENT
);
576 if (audit_buf
== NULL
)
579 audit_log_format(audit_buf
, "auid=%u", auid
);
582 security_secid_to_secctx(sid
, &secctx
, &secctx_len
) == 0) {
583 audit_log_format(audit_buf
, " subj=%s", secctx
);
584 security_release_secctx(secctx
, secctx_len
);
586 audit_log_task_context(audit_buf
);
590 extern void xfrm_audit_policy_add(struct xfrm_policy
*xp
, int result
,
592 extern void xfrm_audit_policy_delete(struct xfrm_policy
*xp
, int result
,
594 extern void xfrm_audit_state_add(struct xfrm_state
*x
, int result
,
596 extern void xfrm_audit_state_delete(struct xfrm_state
*x
, int result
,
599 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
600 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
601 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
602 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
603 #endif /* CONFIG_AUDITSYSCALL */
605 static inline void xfrm_pol_hold(struct xfrm_policy
*policy
)
607 if (likely(policy
!= NULL
))
608 atomic_inc(&policy
->refcnt
);
611 extern void __xfrm_policy_destroy(struct xfrm_policy
*policy
);
613 static inline void xfrm_pol_put(struct xfrm_policy
*policy
)
615 if (atomic_dec_and_test(&policy
->refcnt
))
616 __xfrm_policy_destroy(policy
);
619 #ifdef CONFIG_XFRM_SUB_POLICY
620 static inline void xfrm_pols_put(struct xfrm_policy
**pols
, int npols
)
623 for (i
= npols
- 1; i
>= 0; --i
)
624 xfrm_pol_put(pols
[i
]);
627 static inline void xfrm_pols_put(struct xfrm_policy
**pols
, int npols
)
629 xfrm_pol_put(pols
[0]);
633 extern void __xfrm_state_destroy(struct xfrm_state
*);
635 static inline void __xfrm_state_put(struct xfrm_state
*x
)
637 atomic_dec(&x
->refcnt
);
640 static inline void xfrm_state_put(struct xfrm_state
*x
)
642 if (atomic_dec_and_test(&x
->refcnt
))
643 __xfrm_state_destroy(x
);
646 static inline void xfrm_state_hold(struct xfrm_state
*x
)
648 atomic_inc(&x
->refcnt
);
651 static __inline__
int addr_match(void *token1
, void *token2
, int prefixlen
)
658 pdw
= prefixlen
>> 5; /* num of whole __u32 in prefix */
659 pbi
= prefixlen
& 0x1f; /* num of bits in incomplete u32 in prefix */
662 if (memcmp(a1
, a2
, pdw
<< 2))
668 mask
= htonl((0xffffffff) << (32 - pbi
));
670 if ((a1
[pdw
] ^ a2
[pdw
]) & mask
)
678 __be16
xfrm_flowi_sport(struct flowi
*fl
)
684 case IPPROTO_UDPLITE
:
686 port
= fl
->fl_ip_sport
;
690 port
= htons(fl
->fl_icmp_type
);
693 port
= htons(fl
->fl_mh_type
);
702 __be16
xfrm_flowi_dport(struct flowi
*fl
)
708 case IPPROTO_UDPLITE
:
710 port
= fl
->fl_ip_dport
;
714 port
= htons(fl
->fl_icmp_code
);
722 extern int xfrm_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
,
723 unsigned short family
);
725 #ifdef CONFIG_SECURITY_NETWORK_XFRM
726 /* If neither has a context --> match
727 * Otherwise, both must have a context and the sids, doi, alg must match
729 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx
*s1
, struct xfrm_sec_ctx
*s2
)
731 return ((!s1
&& !s2
) ||
733 (s1
->ctx_sid
== s2
->ctx_sid
) &&
734 (s1
->ctx_doi
== s2
->ctx_doi
) &&
735 (s1
->ctx_alg
== s2
->ctx_alg
)));
738 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx
*s1
, struct xfrm_sec_ctx
*s2
)
744 /* A struct encoding bundle of transformations to apply to some set of flow.
746 * dst->child points to the next element of bundle.
747 * dst->xfrm points to an instanse of transformer.
749 * Due to unfortunate limitations of current routing cache, which we
750 * have no time to fix, it mirrors struct rtable and bound to the same
751 * routing key, including saddr,daddr. However, we can have many of
752 * bundles differing by session id. All the bundles grow from a parent
758 struct dst_entry dst
;
762 struct dst_entry
*route
;
763 #ifdef CONFIG_XFRM_SUB_POLICY
764 struct flowi
*origin
;
765 struct xfrm_selector
*partner
;
768 u32 route_mtu_cached
;
769 u32 child_mtu_cached
;
774 static inline void xfrm_dst_destroy(struct xfrm_dst
*xdst
)
776 dst_release(xdst
->route
);
777 if (likely(xdst
->u
.dst
.xfrm
))
778 xfrm_state_put(xdst
->u
.dst
.xfrm
);
779 #ifdef CONFIG_XFRM_SUB_POLICY
782 kfree(xdst
->partner
);
783 xdst
->partner
= NULL
;
787 extern void xfrm_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
);
793 struct xfrm_state
*xvec
[XFRM_MAX_DEPTH
];
796 static inline struct sec_path
*
797 secpath_get(struct sec_path
*sp
)
800 atomic_inc(&sp
->refcnt
);
804 extern void __secpath_destroy(struct sec_path
*sp
);
807 secpath_put(struct sec_path
*sp
)
809 if (sp
&& atomic_dec_and_test(&sp
->refcnt
))
810 __secpath_destroy(sp
);
813 extern struct sec_path
*secpath_dup(struct sec_path
*src
);
816 secpath_reset(struct sk_buff
*skb
)
819 secpath_put(skb
->sp
);
825 xfrm_addr_any(xfrm_address_t
*addr
, unsigned short family
)
829 return addr
->a4
== 0;
831 return ipv6_addr_any((struct in6_addr
*)&addr
->a6
);
837 __xfrm4_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
)
839 return (tmpl
->saddr
.a4
&&
840 tmpl
->saddr
.a4
!= x
->props
.saddr
.a4
);
844 __xfrm6_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
)
846 return (!ipv6_addr_any((struct in6_addr
*)&tmpl
->saddr
) &&
847 ipv6_addr_cmp((struct in6_addr
*)&tmpl
->saddr
, (struct in6_addr
*)&x
->props
.saddr
));
851 xfrm_state_addr_cmp(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
, unsigned short family
)
855 return __xfrm4_state_addr_cmp(tmpl
, x
);
857 return __xfrm6_state_addr_cmp(tmpl
, x
);
863 extern int __xfrm_policy_check(struct sock
*, int dir
, struct sk_buff
*skb
, unsigned short family
);
865 static inline int __xfrm_policy_check2(struct sock
*sk
, int dir
,
867 unsigned int family
, int reverse
)
869 int ndir
= dir
| (reverse
? XFRM_POLICY_MASK
+ 1 : 0);
871 if (sk
&& sk
->sk_policy
[XFRM_POLICY_IN
])
872 return __xfrm_policy_check(sk
, ndir
, skb
, family
);
874 return (!xfrm_policy_count
[dir
] && !skb
->sp
) ||
875 (skb
->dst
->flags
& DST_NOPOLICY
) ||
876 __xfrm_policy_check(sk
, ndir
, skb
, family
);
879 static inline int xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
, unsigned short family
)
881 return __xfrm_policy_check2(sk
, dir
, skb
, family
, 0);
884 static inline int xfrm4_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
886 return xfrm_policy_check(sk
, dir
, skb
, AF_INET
);
889 static inline int xfrm6_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
891 return xfrm_policy_check(sk
, dir
, skb
, AF_INET6
);
894 static inline int xfrm4_policy_check_reverse(struct sock
*sk
, int dir
,
897 return __xfrm_policy_check2(sk
, dir
, skb
, AF_INET
, 1);
900 static inline int xfrm6_policy_check_reverse(struct sock
*sk
, int dir
,
903 return __xfrm_policy_check2(sk
, dir
, skb
, AF_INET6
, 1);
906 extern int __xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
,
907 unsigned int family
, int reverse
);
909 static inline int xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
,
912 return __xfrm_decode_session(skb
, fl
, family
, 0);
915 static inline int xfrm_decode_session_reverse(struct sk_buff
*skb
,
919 return __xfrm_decode_session(skb
, fl
, family
, 1);
922 extern int __xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
);
924 static inline int xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
)
926 return !xfrm_policy_count
[XFRM_POLICY_OUT
] ||
927 (skb
->dst
->flags
& DST_NOXFRM
) ||
928 __xfrm_route_forward(skb
, family
);
931 static inline int xfrm4_route_forward(struct sk_buff
*skb
)
933 return xfrm_route_forward(skb
, AF_INET
);
936 static inline int xfrm6_route_forward(struct sk_buff
*skb
)
938 return xfrm_route_forward(skb
, AF_INET6
);
941 extern int __xfrm_sk_clone_policy(struct sock
*sk
);
943 static inline int xfrm_sk_clone_policy(struct sock
*sk
)
945 if (unlikely(sk
->sk_policy
[0] || sk
->sk_policy
[1]))
946 return __xfrm_sk_clone_policy(sk
);
950 extern int xfrm_policy_delete(struct xfrm_policy
*pol
, int dir
);
952 static inline void xfrm_sk_free_policy(struct sock
*sk
)
954 if (unlikely(sk
->sk_policy
[0] != NULL
)) {
955 xfrm_policy_delete(sk
->sk_policy
[0], XFRM_POLICY_MAX
);
956 sk
->sk_policy
[0] = NULL
;
958 if (unlikely(sk
->sk_policy
[1] != NULL
)) {
959 xfrm_policy_delete(sk
->sk_policy
[1], XFRM_POLICY_MAX
+1);
960 sk
->sk_policy
[1] = NULL
;
966 static inline void xfrm_sk_free_policy(struct sock
*sk
) {}
967 static inline int xfrm_sk_clone_policy(struct sock
*sk
) { return 0; }
968 static inline int xfrm6_route_forward(struct sk_buff
*skb
) { return 1; }
969 static inline int xfrm4_route_forward(struct sk_buff
*skb
) { return 1; }
970 static inline int xfrm6_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
974 static inline int xfrm4_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
)
978 static inline int xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
, unsigned short family
)
982 static inline int xfrm_decode_session_reverse(struct sk_buff
*skb
,
988 static inline int xfrm4_policy_check_reverse(struct sock
*sk
, int dir
,
993 static inline int xfrm6_policy_check_reverse(struct sock
*sk
, int dir
,
1001 xfrm_address_t
*xfrm_flowi_daddr(struct flowi
*fl
, unsigned short family
)
1005 return (xfrm_address_t
*)&fl
->fl4_dst
;
1007 return (xfrm_address_t
*)&fl
->fl6_dst
;
1013 xfrm_address_t
*xfrm_flowi_saddr(struct flowi
*fl
, unsigned short family
)
1017 return (xfrm_address_t
*)&fl
->fl4_src
;
1019 return (xfrm_address_t
*)&fl
->fl6_src
;
1024 static __inline__
int
1025 __xfrm4_state_addr_check(struct xfrm_state
*x
,
1026 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
)
1028 if (daddr
->a4
== x
->id
.daddr
.a4
&&
1029 (saddr
->a4
== x
->props
.saddr
.a4
|| !saddr
->a4
|| !x
->props
.saddr
.a4
))
1034 static __inline__
int
1035 __xfrm6_state_addr_check(struct xfrm_state
*x
,
1036 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
)
1038 if (!ipv6_addr_cmp((struct in6_addr
*)daddr
, (struct in6_addr
*)&x
->id
.daddr
) &&
1039 (!ipv6_addr_cmp((struct in6_addr
*)saddr
, (struct in6_addr
*)&x
->props
.saddr
)||
1040 ipv6_addr_any((struct in6_addr
*)saddr
) ||
1041 ipv6_addr_any((struct in6_addr
*)&x
->props
.saddr
)))
1046 static __inline__
int
1047 xfrm_state_addr_check(struct xfrm_state
*x
,
1048 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
1049 unsigned short family
)
1053 return __xfrm4_state_addr_check(x
, daddr
, saddr
);
1055 return __xfrm6_state_addr_check(x
, daddr
, saddr
);
1060 static __inline__
int
1061 xfrm_state_addr_flow_check(struct xfrm_state
*x
, struct flowi
*fl
,
1062 unsigned short family
)
1066 return __xfrm4_state_addr_check(x
,
1067 (xfrm_address_t
*)&fl
->fl4_dst
,
1068 (xfrm_address_t
*)&fl
->fl4_src
);
1070 return __xfrm6_state_addr_check(x
,
1071 (xfrm_address_t
*)&fl
->fl6_dst
,
1072 (xfrm_address_t
*)&fl
->fl6_src
);
1077 static inline int xfrm_state_kern(struct xfrm_state
*x
)
1079 return atomic_read(&x
->tunnel_users
);
1082 static inline int xfrm_id_proto_match(u8 proto
, u8 userproto
)
1084 return (!userproto
|| proto
== userproto
||
1085 (userproto
== IPSEC_PROTO_ANY
&& (proto
== IPPROTO_AH
||
1086 proto
== IPPROTO_ESP
||
1087 proto
== IPPROTO_COMP
)));
1091 * xfrm algorithm information
1093 struct xfrm_algo_auth_info
{
1098 struct xfrm_algo_encr_info
{
1103 struct xfrm_algo_comp_info
{
1107 struct xfrm_algo_desc
{
1112 struct xfrm_algo_auth_info auth
;
1113 struct xfrm_algo_encr_info encr
;
1114 struct xfrm_algo_comp_info comp
;
1116 struct sadb_alg desc
;
1119 /* XFRM tunnel handlers. */
1120 struct xfrm_tunnel
{
1121 int (*handler
)(struct sk_buff
*skb
);
1122 int (*err_handler
)(struct sk_buff
*skb
, __u32 info
);
1124 struct xfrm_tunnel
*next
;
1128 struct xfrm6_tunnel
{
1129 int (*handler
)(struct sk_buff
*skb
);
1130 int (*err_handler
)(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
1131 int type
, int code
, int offset
, __be32 info
);
1132 struct xfrm6_tunnel
*next
;
1136 extern void xfrm_init(void);
1137 extern void xfrm4_init(void);
1138 extern void xfrm_state_init(void);
1139 extern void xfrm4_state_init(void);
1141 extern int xfrm6_init(void);
1142 extern void xfrm6_fini(void);
1143 extern int xfrm6_state_init(void);
1144 extern void xfrm6_state_fini(void);
1146 static inline int xfrm6_init(void)
1150 static inline void xfrm6_fini(void)
1156 #ifdef CONFIG_XFRM_STATISTICS
1157 extern int xfrm_proc_init(void);
1160 extern int xfrm_state_walk(u8 proto
, int (*func
)(struct xfrm_state
*, int, void*), void *);
1161 extern struct xfrm_state
*xfrm_state_alloc(void);
1162 extern struct xfrm_state
*xfrm_state_find(xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
1163 struct flowi
*fl
, struct xfrm_tmpl
*tmpl
,
1164 struct xfrm_policy
*pol
, int *err
,
1165 unsigned short family
);
1166 extern struct xfrm_state
* xfrm_stateonly_find(xfrm_address_t
*daddr
,
1167 xfrm_address_t
*saddr
,
1168 unsigned short family
,
1169 u8 mode
, u8 proto
, u32 reqid
);
1170 extern int xfrm_state_check_expire(struct xfrm_state
*x
);
1171 extern void xfrm_state_insert(struct xfrm_state
*x
);
1172 extern int xfrm_state_add(struct xfrm_state
*x
);
1173 extern int xfrm_state_update(struct xfrm_state
*x
);
1174 extern struct xfrm_state
*xfrm_state_lookup(xfrm_address_t
*daddr
, __be32 spi
, u8 proto
, unsigned short family
);
1175 extern struct xfrm_state
*xfrm_state_lookup_byaddr(xfrm_address_t
*daddr
, xfrm_address_t
*saddr
, u8 proto
, unsigned short family
);
1176 #ifdef CONFIG_XFRM_SUB_POLICY
1177 extern int xfrm_tmpl_sort(struct xfrm_tmpl
**dst
, struct xfrm_tmpl
**src
,
1178 int n
, unsigned short family
);
1179 extern int xfrm_state_sort(struct xfrm_state
**dst
, struct xfrm_state
**src
,
1180 int n
, unsigned short family
);
1182 static inline int xfrm_tmpl_sort(struct xfrm_tmpl
**dst
, struct xfrm_tmpl
**src
,
1183 int n
, unsigned short family
)
1188 static inline int xfrm_state_sort(struct xfrm_state
**dst
, struct xfrm_state
**src
,
1189 int n
, unsigned short family
)
1195 struct xfrmk_sadinfo
{
1196 u32 sadhcnt
; /* current hash bkts */
1197 u32 sadhmcnt
; /* max allowed hash bkts */
1198 u32 sadcnt
; /* current running count */
1201 struct xfrmk_spdinfo
{
1212 extern struct xfrm_state
*xfrm_find_acq_byseq(u32 seq
);
1213 extern int xfrm_state_delete(struct xfrm_state
*x
);
1214 extern int xfrm_state_flush(u8 proto
, struct xfrm_audit
*audit_info
);
1215 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo
*si
);
1216 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo
*si
);
1217 extern int xfrm_replay_check(struct xfrm_state
*x
, __be32 seq
);
1218 extern void xfrm_replay_advance(struct xfrm_state
*x
, __be32 seq
);
1219 extern void xfrm_replay_notify(struct xfrm_state
*x
, int event
);
1220 extern int xfrm_state_mtu(struct xfrm_state
*x
, int mtu
);
1221 extern int xfrm_init_state(struct xfrm_state
*x
);
1222 extern int xfrm_prepare_input(struct xfrm_state
*x
, struct sk_buff
*skb
);
1223 extern int xfrm_input(struct sk_buff
*skb
, int nexthdr
, __be32 spi
,
1225 extern int xfrm_input_resume(struct sk_buff
*skb
, int nexthdr
);
1226 extern int xfrm_output_resume(struct sk_buff
*skb
, int err
);
1227 extern int xfrm_output(struct sk_buff
*skb
);
1228 extern int xfrm4_extract_header(struct sk_buff
*skb
);
1229 extern int xfrm4_extract_input(struct xfrm_state
*x
, struct sk_buff
*skb
);
1230 extern int xfrm4_rcv_encap(struct sk_buff
*skb
, int nexthdr
, __be32 spi
,
1232 extern int xfrm4_transport_finish(struct sk_buff
*skb
, int async
);
1233 extern int xfrm4_rcv(struct sk_buff
*skb
);
1235 static inline int xfrm4_rcv_spi(struct sk_buff
*skb
, int nexthdr
, __be32 spi
)
1237 return xfrm4_rcv_encap(skb
, nexthdr
, spi
, 0);
1240 extern int xfrm4_extract_output(struct xfrm_state
*x
, struct sk_buff
*skb
);
1241 extern int xfrm4_prepare_output(struct xfrm_state
*x
, struct sk_buff
*skb
);
1242 extern int xfrm4_output(struct sk_buff
*skb
);
1243 extern int xfrm4_tunnel_register(struct xfrm_tunnel
*handler
, unsigned short family
);
1244 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel
*handler
, unsigned short family
);
1245 extern int xfrm6_extract_header(struct sk_buff
*skb
);
1246 extern int xfrm6_extract_input(struct xfrm_state
*x
, struct sk_buff
*skb
);
1247 extern int xfrm6_rcv_spi(struct sk_buff
*skb
, int nexthdr
, __be32 spi
);
1248 extern int xfrm6_transport_finish(struct sk_buff
*skb
, int async
);
1249 extern int xfrm6_rcv(struct sk_buff
*skb
);
1250 extern int xfrm6_input_addr(struct sk_buff
*skb
, xfrm_address_t
*daddr
,
1251 xfrm_address_t
*saddr
, u8 proto
);
1252 extern int xfrm6_tunnel_register(struct xfrm6_tunnel
*handler
, unsigned short family
);
1253 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel
*handler
, unsigned short family
);
1254 extern __be32
xfrm6_tunnel_alloc_spi(xfrm_address_t
*saddr
);
1255 extern void xfrm6_tunnel_free_spi(xfrm_address_t
*saddr
);
1256 extern __be32
xfrm6_tunnel_spi_lookup(xfrm_address_t
*saddr
);
1257 extern int xfrm6_extract_output(struct xfrm_state
*x
, struct sk_buff
*skb
);
1258 extern int xfrm6_prepare_output(struct xfrm_state
*x
, struct sk_buff
*skb
);
1259 extern int xfrm6_output(struct sk_buff
*skb
);
1260 extern int xfrm6_find_1stfragopt(struct xfrm_state
*x
, struct sk_buff
*skb
,
1264 extern int xfrm4_udp_encap_rcv(struct sock
*sk
, struct sk_buff
*skb
);
1265 extern int xfrm_user_policy(struct sock
*sk
, int optname
, u8 __user
*optval
, int optlen
);
1267 static inline int xfrm_user_policy(struct sock
*sk
, int optname
, u8 __user
*optval
, int optlen
)
1269 return -ENOPROTOOPT
;
1272 static inline int xfrm4_udp_encap_rcv(struct sock
*sk
, struct sk_buff
*skb
)
1274 /* should not happen */
1280 struct xfrm_policy
*xfrm_policy_alloc(gfp_t gfp
);
1281 extern int xfrm_policy_walk(u8 type
, int (*func
)(struct xfrm_policy
*, int, int, void*), void *);
1282 int xfrm_policy_insert(int dir
, struct xfrm_policy
*policy
, int excl
);
1283 struct xfrm_policy
*xfrm_policy_bysel_ctx(u8 type
, int dir
,
1284 struct xfrm_selector
*sel
,
1285 struct xfrm_sec_ctx
*ctx
, int delete,
1287 struct xfrm_policy
*xfrm_policy_byid(u8
, int dir
, u32 id
, int delete, int *err
);
1288 int xfrm_policy_flush(u8 type
, struct xfrm_audit
*audit_info
);
1289 u32
xfrm_get_acqseq(void);
1290 extern int xfrm_alloc_spi(struct xfrm_state
*x
, u32 minspi
, u32 maxspi
);
1291 struct xfrm_state
* xfrm_find_acq(u8 mode
, u32 reqid
, u8 proto
,
1292 xfrm_address_t
*daddr
, xfrm_address_t
*saddr
,
1293 int create
, unsigned short family
);
1294 extern int xfrm_policy_flush(u8 type
, struct xfrm_audit
*audit_info
);
1295 extern int xfrm_sk_policy_insert(struct sock
*sk
, int dir
, struct xfrm_policy
*pol
);
1296 extern int xfrm_bundle_ok(struct xfrm_policy
*pol
, struct xfrm_dst
*xdst
,
1297 struct flowi
*fl
, int family
, int strict
);
1299 #ifdef CONFIG_XFRM_MIGRATE
1300 extern int km_migrate(struct xfrm_selector
*sel
, u8 dir
, u8 type
,
1301 struct xfrm_migrate
*m
, int num_bundles
);
1302 extern struct xfrm_state
* xfrm_migrate_state_find(struct xfrm_migrate
*m
);
1303 extern struct xfrm_state
* xfrm_state_migrate(struct xfrm_state
*x
,
1304 struct xfrm_migrate
*m
);
1305 extern int xfrm_migrate(struct xfrm_selector
*sel
, u8 dir
, u8 type
,
1306 struct xfrm_migrate
*m
, int num_bundles
);
1309 extern wait_queue_head_t km_waitq
;
1310 extern int km_new_mapping(struct xfrm_state
*x
, xfrm_address_t
*ipaddr
, __be16 sport
);
1311 extern void km_policy_expired(struct xfrm_policy
*pol
, int dir
, int hard
, u32 pid
);
1312 extern int km_report(u8 proto
, struct xfrm_selector
*sel
, xfrm_address_t
*addr
);
1314 extern void xfrm_input_init(void);
1315 extern int xfrm_parse_spi(struct sk_buff
*skb
, u8 nexthdr
, __be32
*spi
, __be32
*seq
);
1317 extern void xfrm_probe_algs(void);
1318 extern int xfrm_count_auth_supported(void);
1319 extern int xfrm_count_enc_supported(void);
1320 extern struct xfrm_algo_desc
*xfrm_aalg_get_byidx(unsigned int idx
);
1321 extern struct xfrm_algo_desc
*xfrm_ealg_get_byidx(unsigned int idx
);
1322 extern struct xfrm_algo_desc
*xfrm_aalg_get_byid(int alg_id
);
1323 extern struct xfrm_algo_desc
*xfrm_ealg_get_byid(int alg_id
);
1324 extern struct xfrm_algo_desc
*xfrm_calg_get_byid(int alg_id
);
1325 extern struct xfrm_algo_desc
*xfrm_aalg_get_byname(char *name
, int probe
);
1326 extern struct xfrm_algo_desc
*xfrm_ealg_get_byname(char *name
, int probe
);
1327 extern struct xfrm_algo_desc
*xfrm_calg_get_byname(char *name
, int probe
);
1331 typedef int (icv_update_fn_t
)(struct hash_desc
*, struct scatterlist
*,
1334 extern int skb_icv_walk(const struct sk_buff
*skb
, struct hash_desc
*tfm
,
1335 int offset
, int len
, icv_update_fn_t icv_update
);
1337 static inline int xfrm_addr_cmp(xfrm_address_t
*a
, xfrm_address_t
*b
,
1343 return (__force __u32
)a
->a4
- (__force __u32
)b
->a4
;
1345 return ipv6_addr_cmp((struct in6_addr
*)a
,
1346 (struct in6_addr
*)b
);
1350 static inline int xfrm_policy_id2dir(u32 index
)
1355 static inline int xfrm_aevent_is_on(void)
1361 nlsk
= rcu_dereference(xfrm_nl
);
1363 ret
= netlink_has_listeners(nlsk
, XFRMNLGRP_AEVENTS
);
1368 static inline int xfrm_alg_len(struct xfrm_algo
*alg
)
1370 return sizeof(*alg
) + ((alg
->alg_key_len
+ 7) / 8);
1373 #ifdef CONFIG_XFRM_MIGRATE
1374 static inline struct xfrm_algo
*xfrm_algo_clone(struct xfrm_algo
*orig
)
1376 return kmemdup(orig
, xfrm_alg_len(orig
), GFP_KERNEL
);
1379 static inline void xfrm_states_put(struct xfrm_state
**states
, int n
)
1382 for (i
= 0; i
< n
; i
++)
1383 xfrm_state_put(*(states
+ i
));
1386 static inline void xfrm_states_delete(struct xfrm_state
**states
, int n
)
1389 for (i
= 0; i
< n
; i
++)
1390 xfrm_state_delete(*(states
+ i
));
1394 static inline struct xfrm_state
*xfrm_input_state(struct sk_buff
*skb
)
1396 return skb
->sp
->xvec
[skb
->sp
->len
- 1];
1399 #endif /* _NET_XFRM_H */