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>
23 #define XFRM_PROTO_ESP 50
24 #define XFRM_PROTO_AH 51
25 #define XFRM_PROTO_COMP 108
26 #define XFRM_PROTO_IPIP 4
27 #define XFRM_PROTO_IPV6 41
28 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
29 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
31 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
32 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
33 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
34 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
35 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
37 extern struct sock *xfrm_nl;
38 extern u32 sysctl_xfrm_aevent_etime;
39 extern u32 sysctl_xfrm_aevent_rseqth;
41 extern struct mutex xfrm_cfg_mutex;
43 /* Organization of SPD aka "XFRM rules"
44 ------------------------------------
47 - policy rule, struct xfrm_policy (=SPD entry)
48 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
49 - instance of a transformer, struct xfrm_state (=SA)
50 - template to clone xfrm_state, struct xfrm_tmpl
52 SPD is plain linear list of xfrm_policy rules, ordered by priority.
53 (To be compatible with existing pfkeyv2 implementations,
54 many rules with priority of 0x7fffffff are allowed to exist and
55 such rules are ordered in an unpredictable way, thanks to bsd folks.)
57 Lookup is plain linear search until the first match with selector.
59 If "action" is "block", then we prohibit the flow, otherwise:
60 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
61 policy entry has list of up to XFRM_MAX_DEPTH transformations,
62 described by templates xfrm_tmpl. Each template is resolved
63 to a complete xfrm_state (see below) and we pack bundle of transformations
64 to a dst_entry returned to requestor.
66 dst -. xfrm .-> xfrm_state #1
67 |---. child .-> dst -. xfrm .-> xfrm_state #2
68 |---. child .-> dst -. xfrm .-> xfrm_state #3
71 Bundles are cached at xrfm_policy struct (field ->bundles).
74 Resolution of xrfm_tmpl
75 -----------------------
77 1. ->mode Mode: transport or tunnel
78 2. ->id.proto Protocol: AH/ESP/IPCOMP
79 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
80 Q: allow to resolve security gateway?
81 4. ->id.spi If not zero, static SPI.
82 5. ->saddr Local tunnel endpoint, ignored for transport mode.
83 6. ->algos List of allowed algos. Plain bitmask now.
84 Q: ealgos, aalgos, calgos. What a mess...
85 7. ->share Sharing mode.
86 Q: how to implement private sharing mode? To add struct sock* to
89 Having this template we search through SAD searching for entries
90 with appropriate mode/proto/algo, permitted by selector.
91 If no appropriate entry found, it is requested from key manager.
94 Q: How to find all the bundles referring to a physical path for
95 PMTU discovery? Seems, dst should contain list of all parents...
96 and enter to infinite locking hierarchy disaster.
97 No! It is easier, we will not search for them, let them find us.
98 We add genid to each dst plus pointer to genid of raw IP route,
99 pmtu disc will update pmtu on raw IP route and increase its genid.
100 dst_check() will see this for top level and trigger resyncing
101 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
104 /* Full description of state of transformer. */
107 /* Note: bydst is re-used during gc */
108 struct hlist_node bydst;
109 struct hlist_node bysrc;
110 struct hlist_node byspi;
116 struct xfrm_selector sel;
120 /* Key manger bits */
127 /* Parameters of this state. */
132 u8 aalgo, ealgo, calgo;
135 xfrm_address_t saddr;
140 struct xfrm_lifetime_cfg lft;
142 /* Data for transformer */
143 struct xfrm_algo *aalg;
144 struct xfrm_algo *ealg;
145 struct xfrm_algo *calg;
147 /* Data for encapsulator */
148 struct xfrm_encap_tmpl *encap;
150 /* Data for care-of address */
151 xfrm_address_t *coaddr;
153 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
154 struct xfrm_state *tunnel;
156 /* If a tunnel, number of users + 1 */
157 atomic_t tunnel_users;
159 /* State for replay detection */
160 struct xfrm_replay_state replay;
162 /* Replay detection state at the time we sent the last notification */
163 struct xfrm_replay_state preplay;
165 /* internal flag that only holds state for delayed aevent at the
170 /* Replay detection notification settings */
174 /* Replay detection notification timer */
175 struct timer_list rtimer;
178 struct xfrm_stats stats;
180 struct xfrm_lifetime_cur curlft;
181 struct timer_list timer;
186 /* Reference to data common to all the instances of this
188 struct xfrm_type *type;
189 struct xfrm_mode *mode;
191 /* Security context */
192 struct xfrm_sec_ctx *security;
194 /* Private data of this transformer, format is opaque,
195 * interpreted by xfrm_type methods. */
199 /* xflags - make enum if more show up */
200 #define XFRM_TIME_DEFER 1
211 /* callback structure passed from either netlink or pfkey */
229 struct xfrm_policy_afinfo {
230 unsigned short family;
231 struct dst_ops *dst_ops;
232 void (*garbage_collect)(void);
233 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
234 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
235 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
236 int (*bundle_create)(struct xfrm_policy *policy,
237 struct xfrm_state **xfrm,
240 struct dst_entry **dst_p);
241 void (*decode_session)(struct sk_buff *skb,
245 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
246 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
247 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
248 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
251 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
252 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
253 extern int __xfrm_state_delete(struct xfrm_state *x);
255 struct xfrm_state_afinfo {
256 unsigned short family;
257 struct xfrm_type *type_map[IPPROTO_MAX];
258 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
259 int (*init_flags)(struct xfrm_state *x);
260 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
261 struct xfrm_tmpl *tmpl,
262 xfrm_address_t *daddr, xfrm_address_t *saddr);
263 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
264 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
265 int (*output)(struct sk_buff *skb);
268 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
269 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
270 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
271 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
273 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
278 struct module *owner;
281 #define XFRM_TYPE_NON_FRAGMENT 1
282 #define XFRM_TYPE_REPLAY_PROT 2
284 int (*init_state)(struct xfrm_state *x);
285 void (*destructor)(struct xfrm_state *);
286 int (*input)(struct xfrm_state *, struct sk_buff *skb);
287 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
288 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
289 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
290 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
291 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
292 /* Estimate maximal size of result of transformation of a dgram */
293 u32 (*get_mtu)(struct xfrm_state *, int size);
296 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
297 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
300 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
303 * Add encapsulation header.
305 * On exit, the transport header will be set to the start of the
306 * encapsulation header to be filled in by x->type->output and
307 * the mac header will be set to the nextheader (protocol for
308 * IPv4) field of the extension header directly preceding the
309 * encapsulation header, or in its absence, that of the top IP
310 * header. The value of the network header will always point
311 * to the top IP header while skb->data will point to the payload.
313 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
315 struct module *owner;
319 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
320 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
324 /* id in template is interpreted as:
325 * daddr - destination of tunnel, may be zero for transport mode.
326 * spi - zero to acquire spi. Not zero if spi is static, then
327 * daddr must be fixed too.
328 * proto - AH/ESP/IPCOMP
332 /* Source address of tunnel. Ignored, if it is not a tunnel. */
333 xfrm_address_t saddr;
335 unsigned short encap_family;
339 /* Mode: transport, tunnel etc. */
342 /* Sharing mode: unique, this session only, this user only etc. */
345 /* May skip this transfomration if no SA is found */
348 /* Bit mask of algos allowed for acquisition */
354 #define XFRM_MAX_DEPTH 6
358 struct xfrm_policy *next;
359 struct hlist_node bydst;
360 struct hlist_node byidx;
362 /* This lock only affects elements except for entry. */
365 struct timer_list timer;
369 struct xfrm_selector selector;
370 struct xfrm_lifetime_cfg lft;
371 struct xfrm_lifetime_cur curlft;
372 struct dst_entry *bundles;
379 /* XXX 1 byte hole, try to pack */
380 struct xfrm_sec_ctx *security;
381 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
384 struct xfrm_migrate {
385 xfrm_address_t old_daddr;
386 xfrm_address_t old_saddr;
387 xfrm_address_t new_daddr;
388 xfrm_address_t new_saddr;
397 #define XFRM_KM_TIMEOUT 30
399 #define XFRM_REPLAY_SEQ 1
400 #define XFRM_REPLAY_OSEQ 2
401 #define XFRM_REPLAY_SEQ_MASK 3
403 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
404 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
406 /* default aevent timeout in units of 100ms */
407 #define XFRM_AE_ETIME 10
408 /* Async Event timer multiplier */
409 #define XFRM_AE_ETH_M 10
410 /* default seq threshold size */
411 #define XFRM_AE_SEQT_SIZE 2
415 struct list_head list;
417 int (*notify)(struct xfrm_state *x, struct km_event *c);
418 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
419 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
420 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
421 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
422 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
423 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
426 extern int xfrm_register_km(struct xfrm_mgr *km);
427 extern int xfrm_unregister_km(struct xfrm_mgr *km);
429 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
432 * This structure is used for the duration where packets are being
433 * transformed by IPsec. As soon as the packet leaves IPsec the
434 * area beyond the generic IP part may be overwritten.
438 struct inet_skb_parm h4;
439 struct inet6_skb_parm h6;
442 /* Sequence number for replay protection. */
446 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
448 /* Audit Information */
455 #ifdef CONFIG_AUDITSYSCALL
456 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
458 struct audit_buffer *audit_buf = NULL;
462 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
463 AUDIT_MAC_IPSEC_EVENT);
464 if (audit_buf == NULL)
467 audit_log_format(audit_buf, "auid=%u", auid);
470 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
471 audit_log_format(audit_buf, " subj=%s", secctx);
472 security_release_secctx(secctx, secctx_len);
474 audit_log_task_context(audit_buf);
478 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
480 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
482 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
484 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
487 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
488 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
489 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
490 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
491 #endif /* CONFIG_AUDITSYSCALL */
493 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
495 if (likely(policy != NULL))
496 atomic_inc(&policy->refcnt);
499 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
501 static inline void xfrm_pol_put(struct xfrm_policy *policy)
503 if (atomic_dec_and_test(&policy->refcnt))
504 __xfrm_policy_destroy(policy);
507 #ifdef CONFIG_XFRM_SUB_POLICY
508 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
511 for (i = npols - 1; i >= 0; --i)
512 xfrm_pol_put(pols[i]);
515 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
517 xfrm_pol_put(pols[0]);
521 extern void __xfrm_state_destroy(struct xfrm_state *);
523 static inline void __xfrm_state_put(struct xfrm_state *x)
525 atomic_dec(&x->refcnt);
528 static inline void xfrm_state_put(struct xfrm_state *x)
530 if (atomic_dec_and_test(&x->refcnt))
531 __xfrm_state_destroy(x);
534 static inline void xfrm_state_hold(struct xfrm_state *x)
536 atomic_inc(&x->refcnt);
539 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
546 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
547 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
550 if (memcmp(a1, a2, pdw << 2))
556 mask = htonl((0xffffffff) << (32 - pbi));
558 if ((a1[pdw] ^ a2[pdw]) & mask)
566 __be16 xfrm_flowi_sport(struct flowi *fl)
572 case IPPROTO_UDPLITE:
574 port = fl->fl_ip_sport;
578 port = htons(fl->fl_icmp_type);
581 port = htons(fl->fl_mh_type);
590 __be16 xfrm_flowi_dport(struct flowi *fl)
596 case IPPROTO_UDPLITE:
598 port = fl->fl_ip_dport;
602 port = htons(fl->fl_icmp_code);
610 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
611 unsigned short family);
613 #ifdef CONFIG_SECURITY_NETWORK_XFRM
614 /* If neither has a context --> match
615 * Otherwise, both must have a context and the sids, doi, alg must match
617 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
619 return ((!s1 && !s2) ||
621 (s1->ctx_sid == s2->ctx_sid) &&
622 (s1->ctx_doi == s2->ctx_doi) &&
623 (s1->ctx_alg == s2->ctx_alg)));
626 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
632 /* A struct encoding bundle of transformations to apply to some set of flow.
634 * dst->child points to the next element of bundle.
635 * dst->xfrm points to an instanse of transformer.
637 * Due to unfortunate limitations of current routing cache, which we
638 * have no time to fix, it mirrors struct rtable and bound to the same
639 * routing key, including saddr,daddr. However, we can have many of
640 * bundles differing by session id. All the bundles grow from a parent
646 struct dst_entry dst;
650 struct dst_entry *route;
651 #ifdef CONFIG_XFRM_SUB_POLICY
652 struct flowi *origin;
653 struct xfrm_selector *partner;
656 u32 route_mtu_cached;
657 u32 child_mtu_cached;
662 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
664 dst_release(xdst->route);
665 if (likely(xdst->u.dst.xfrm))
666 xfrm_state_put(xdst->u.dst.xfrm);
667 #ifdef CONFIG_XFRM_SUB_POLICY
670 kfree(xdst->partner);
671 xdst->partner = NULL;
675 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
681 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
684 static inline struct sec_path *
685 secpath_get(struct sec_path *sp)
688 atomic_inc(&sp->refcnt);
692 extern void __secpath_destroy(struct sec_path *sp);
695 secpath_put(struct sec_path *sp)
697 if (sp && atomic_dec_and_test(&sp->refcnt))
698 __secpath_destroy(sp);
701 extern struct sec_path *secpath_dup(struct sec_path *src);
704 secpath_reset(struct sk_buff *skb)
707 secpath_put(skb->sp);
713 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
717 return addr->a4 == 0;
719 return ipv6_addr_any((struct in6_addr *)&addr->a6);
725 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
727 return (tmpl->saddr.a4 &&
728 tmpl->saddr.a4 != x->props.saddr.a4);
732 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
734 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
735 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
739 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
743 return __xfrm4_state_addr_cmp(tmpl, x);
745 return __xfrm6_state_addr_cmp(tmpl, x);
752 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
754 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
756 if (sk && sk->sk_policy[XFRM_POLICY_IN])
757 return __xfrm_policy_check(sk, dir, skb, family);
759 return (!xfrm_policy_count[dir] && !skb->sp) ||
760 (skb->dst->flags & DST_NOPOLICY) ||
761 __xfrm_policy_check(sk, dir, skb, family);
764 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
766 return xfrm_policy_check(sk, dir, skb, AF_INET);
769 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
771 return xfrm_policy_check(sk, dir, skb, AF_INET6);
774 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
775 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
777 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
779 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
780 (skb->dst->flags & DST_NOXFRM) ||
781 __xfrm_route_forward(skb, family);
784 static inline int xfrm4_route_forward(struct sk_buff *skb)
786 return xfrm_route_forward(skb, AF_INET);
789 static inline int xfrm6_route_forward(struct sk_buff *skb)
791 return xfrm_route_forward(skb, AF_INET6);
794 extern int __xfrm_sk_clone_policy(struct sock *sk);
796 static inline int xfrm_sk_clone_policy(struct sock *sk)
798 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
799 return __xfrm_sk_clone_policy(sk);
803 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
805 static inline void xfrm_sk_free_policy(struct sock *sk)
807 if (unlikely(sk->sk_policy[0] != NULL)) {
808 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
809 sk->sk_policy[0] = NULL;
811 if (unlikely(sk->sk_policy[1] != NULL)) {
812 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
813 sk->sk_policy[1] = NULL;
819 static inline void xfrm_sk_free_policy(struct sock *sk) {}
820 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
821 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
822 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
823 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
827 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
831 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
838 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
842 return (xfrm_address_t *)&fl->fl4_dst;
844 return (xfrm_address_t *)&fl->fl6_dst;
850 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
854 return (xfrm_address_t *)&fl->fl4_src;
856 return (xfrm_address_t *)&fl->fl6_src;
861 static __inline__ int
862 __xfrm4_state_addr_check(struct xfrm_state *x,
863 xfrm_address_t *daddr, xfrm_address_t *saddr)
865 if (daddr->a4 == x->id.daddr.a4 &&
866 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
871 static __inline__ int
872 __xfrm6_state_addr_check(struct xfrm_state *x,
873 xfrm_address_t *daddr, xfrm_address_t *saddr)
875 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
876 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
877 ipv6_addr_any((struct in6_addr *)saddr) ||
878 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
883 static __inline__ int
884 xfrm_state_addr_check(struct xfrm_state *x,
885 xfrm_address_t *daddr, xfrm_address_t *saddr,
886 unsigned short family)
890 return __xfrm4_state_addr_check(x, daddr, saddr);
892 return __xfrm6_state_addr_check(x, daddr, saddr);
897 static __inline__ int
898 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
899 unsigned short family)
903 return __xfrm4_state_addr_check(x,
904 (xfrm_address_t *)&fl->fl4_dst,
905 (xfrm_address_t *)&fl->fl4_src);
907 return __xfrm6_state_addr_check(x,
908 (xfrm_address_t *)&fl->fl6_dst,
909 (xfrm_address_t *)&fl->fl6_src);
914 static inline int xfrm_state_kern(struct xfrm_state *x)
916 return atomic_read(&x->tunnel_users);
919 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
921 return (!userproto || proto == userproto ||
922 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
923 proto == IPPROTO_ESP ||
924 proto == IPPROTO_COMP)));
928 * xfrm algorithm information
930 struct xfrm_algo_auth_info {
935 struct xfrm_algo_encr_info {
940 struct xfrm_algo_comp_info {
944 struct xfrm_algo_desc {
949 struct xfrm_algo_auth_info auth;
950 struct xfrm_algo_encr_info encr;
951 struct xfrm_algo_comp_info comp;
953 struct sadb_alg desc;
956 /* XFRM tunnel handlers. */
958 int (*handler)(struct sk_buff *skb);
959 int (*err_handler)(struct sk_buff *skb, __u32 info);
961 struct xfrm_tunnel *next;
965 struct xfrm6_tunnel {
966 int (*handler)(struct sk_buff *skb);
967 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
968 int type, int code, int offset, __be32 info);
969 struct xfrm6_tunnel *next;
973 extern void xfrm_init(void);
974 extern void xfrm4_init(void);
975 extern void xfrm6_init(void);
976 extern void xfrm6_fini(void);
977 extern void xfrm_state_init(void);
978 extern void xfrm4_state_init(void);
979 extern void xfrm6_state_init(void);
980 extern void xfrm6_state_fini(void);
982 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
983 extern struct xfrm_state *xfrm_state_alloc(void);
984 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
985 struct flowi *fl, struct xfrm_tmpl *tmpl,
986 struct xfrm_policy *pol, int *err,
987 unsigned short family);
988 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
989 xfrm_address_t *saddr,
990 unsigned short family,
991 u8 mode, u8 proto, u32 reqid);
992 extern int xfrm_state_check_expire(struct xfrm_state *x);
993 extern void xfrm_state_insert(struct xfrm_state *x);
994 extern int xfrm_state_add(struct xfrm_state *x);
995 extern int xfrm_state_update(struct xfrm_state *x);
996 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
997 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
998 #ifdef CONFIG_XFRM_SUB_POLICY
999 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1000 int n, unsigned short family);
1001 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1002 int n, unsigned short family);
1004 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1005 int n, unsigned short family)
1010 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1011 int n, unsigned short family)
1017 struct xfrmk_sadinfo {
1018 u32 sadhcnt; /* current hash bkts */
1019 u32 sadhmcnt; /* max allowed hash bkts */
1020 u32 sadcnt; /* current running count */
1023 struct xfrmk_spdinfo {
1034 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1035 extern int xfrm_state_delete(struct xfrm_state *x);
1036 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1037 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1038 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1039 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1040 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1041 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1042 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1043 extern int xfrm_init_state(struct xfrm_state *x);
1044 extern int xfrm_output(struct sk_buff *skb);
1045 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1047 extern int xfrm4_rcv(struct sk_buff *skb);
1049 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1051 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1054 extern int xfrm4_output(struct sk_buff *skb);
1055 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1056 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1057 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1058 extern int xfrm6_rcv(struct sk_buff *skb);
1059 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1060 xfrm_address_t *saddr, u8 proto);
1061 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1062 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1063 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1064 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1065 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1066 extern int xfrm6_output(struct sk_buff *skb);
1067 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1071 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1072 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1073 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1075 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1077 return -ENOPROTOOPT;
1080 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1082 /* should not happen */
1087 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1093 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1094 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1095 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1096 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1097 struct xfrm_selector *sel,
1098 struct xfrm_sec_ctx *ctx, int delete,
1100 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1101 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1102 u32 xfrm_get_acqseq(void);
1103 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1104 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1105 xfrm_address_t *daddr, xfrm_address_t *saddr,
1106 int create, unsigned short family);
1107 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1108 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1109 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1110 struct flowi *fl, int family, int strict);
1111 extern void xfrm_init_pmtu(struct dst_entry *dst);
1113 #ifdef CONFIG_XFRM_MIGRATE
1114 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1115 struct xfrm_migrate *m, int num_bundles);
1116 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1117 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1118 struct xfrm_migrate *m);
1119 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1120 struct xfrm_migrate *m, int num_bundles);
1123 extern wait_queue_head_t km_waitq;
1124 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1125 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1126 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1128 extern void xfrm_input_init(void);
1129 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1131 extern void xfrm_probe_algs(void);
1132 extern int xfrm_count_auth_supported(void);
1133 extern int xfrm_count_enc_supported(void);
1134 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1135 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1136 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1137 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1138 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1139 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1140 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1141 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1145 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1148 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1149 int offset, int len, icv_update_fn_t icv_update);
1151 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1157 return (__force __u32)a->a4 - (__force __u32)b->a4;
1159 return ipv6_addr_cmp((struct in6_addr *)a,
1160 (struct in6_addr *)b);
1164 static inline int xfrm_policy_id2dir(u32 index)
1169 static inline int xfrm_aevent_is_on(void)
1175 nlsk = rcu_dereference(xfrm_nl);
1177 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1182 #ifdef CONFIG_XFRM_MIGRATE
1183 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1185 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1188 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1191 for (i = 0; i < n; i++)
1192 xfrm_state_put(*(states + i));
1195 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1198 for (i = 0; i < n; i++)
1199 xfrm_state_delete(*(states + i));
1203 #endif /* _NET_XFRM_H */