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;
320 /* Flags for xfrm_mode. */
322 XFRM_MODE_FLAG_TUNNEL = 1,
325 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
326 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
330 /* id in template is interpreted as:
331 * daddr - destination of tunnel, may be zero for transport mode.
332 * spi - zero to acquire spi. Not zero if spi is static, then
333 * daddr must be fixed too.
334 * proto - AH/ESP/IPCOMP
338 /* Source address of tunnel. Ignored, if it is not a tunnel. */
339 xfrm_address_t saddr;
341 unsigned short encap_family;
345 /* Mode: transport, tunnel etc. */
348 /* Sharing mode: unique, this session only, this user only etc. */
351 /* May skip this transfomration if no SA is found */
354 /* Bit mask of algos allowed for acquisition */
360 #define XFRM_MAX_DEPTH 6
364 struct xfrm_policy *next;
365 struct hlist_node bydst;
366 struct hlist_node byidx;
368 /* This lock only affects elements except for entry. */
371 struct timer_list timer;
375 struct xfrm_selector selector;
376 struct xfrm_lifetime_cfg lft;
377 struct xfrm_lifetime_cur curlft;
378 struct dst_entry *bundles;
385 /* XXX 1 byte hole, try to pack */
386 struct xfrm_sec_ctx *security;
387 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
390 struct xfrm_migrate {
391 xfrm_address_t old_daddr;
392 xfrm_address_t old_saddr;
393 xfrm_address_t new_daddr;
394 xfrm_address_t new_saddr;
403 #define XFRM_KM_TIMEOUT 30
405 #define XFRM_REPLAY_SEQ 1
406 #define XFRM_REPLAY_OSEQ 2
407 #define XFRM_REPLAY_SEQ_MASK 3
409 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
410 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
412 /* default aevent timeout in units of 100ms */
413 #define XFRM_AE_ETIME 10
414 /* Async Event timer multiplier */
415 #define XFRM_AE_ETH_M 10
416 /* default seq threshold size */
417 #define XFRM_AE_SEQT_SIZE 2
421 struct list_head list;
423 int (*notify)(struct xfrm_state *x, struct km_event *c);
424 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
425 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
426 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
427 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
428 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
429 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
432 extern int xfrm_register_km(struct xfrm_mgr *km);
433 extern int xfrm_unregister_km(struct xfrm_mgr *km);
435 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
438 * This structure is used for the duration where packets are being
439 * transformed by IPsec. As soon as the packet leaves IPsec the
440 * area beyond the generic IP part may be overwritten.
444 struct inet_skb_parm h4;
445 struct inet6_skb_parm h6;
448 /* Sequence number for replay protection. */
452 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
454 /* Audit Information */
461 #ifdef CONFIG_AUDITSYSCALL
462 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
464 struct audit_buffer *audit_buf = NULL;
468 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
469 AUDIT_MAC_IPSEC_EVENT);
470 if (audit_buf == NULL)
473 audit_log_format(audit_buf, "auid=%u", auid);
476 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
477 audit_log_format(audit_buf, " subj=%s", secctx);
478 security_release_secctx(secctx, secctx_len);
480 audit_log_task_context(audit_buf);
484 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
486 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
488 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
490 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
493 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
494 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
495 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
496 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
497 #endif /* CONFIG_AUDITSYSCALL */
499 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
501 if (likely(policy != NULL))
502 atomic_inc(&policy->refcnt);
505 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
507 static inline void xfrm_pol_put(struct xfrm_policy *policy)
509 if (atomic_dec_and_test(&policy->refcnt))
510 __xfrm_policy_destroy(policy);
513 #ifdef CONFIG_XFRM_SUB_POLICY
514 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
517 for (i = npols - 1; i >= 0; --i)
518 xfrm_pol_put(pols[i]);
521 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
523 xfrm_pol_put(pols[0]);
527 extern void __xfrm_state_destroy(struct xfrm_state *);
529 static inline void __xfrm_state_put(struct xfrm_state *x)
531 atomic_dec(&x->refcnt);
534 static inline void xfrm_state_put(struct xfrm_state *x)
536 if (atomic_dec_and_test(&x->refcnt))
537 __xfrm_state_destroy(x);
540 static inline void xfrm_state_hold(struct xfrm_state *x)
542 atomic_inc(&x->refcnt);
545 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
552 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
553 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
556 if (memcmp(a1, a2, pdw << 2))
562 mask = htonl((0xffffffff) << (32 - pbi));
564 if ((a1[pdw] ^ a2[pdw]) & mask)
572 __be16 xfrm_flowi_sport(struct flowi *fl)
578 case IPPROTO_UDPLITE:
580 port = fl->fl_ip_sport;
584 port = htons(fl->fl_icmp_type);
587 port = htons(fl->fl_mh_type);
596 __be16 xfrm_flowi_dport(struct flowi *fl)
602 case IPPROTO_UDPLITE:
604 port = fl->fl_ip_dport;
608 port = htons(fl->fl_icmp_code);
616 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
617 unsigned short family);
619 #ifdef CONFIG_SECURITY_NETWORK_XFRM
620 /* If neither has a context --> match
621 * Otherwise, both must have a context and the sids, doi, alg must match
623 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
625 return ((!s1 && !s2) ||
627 (s1->ctx_sid == s2->ctx_sid) &&
628 (s1->ctx_doi == s2->ctx_doi) &&
629 (s1->ctx_alg == s2->ctx_alg)));
632 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
638 /* A struct encoding bundle of transformations to apply to some set of flow.
640 * dst->child points to the next element of bundle.
641 * dst->xfrm points to an instanse of transformer.
643 * Due to unfortunate limitations of current routing cache, which we
644 * have no time to fix, it mirrors struct rtable and bound to the same
645 * routing key, including saddr,daddr. However, we can have many of
646 * bundles differing by session id. All the bundles grow from a parent
652 struct dst_entry dst;
656 struct dst_entry *route;
657 #ifdef CONFIG_XFRM_SUB_POLICY
658 struct flowi *origin;
659 struct xfrm_selector *partner;
662 u32 route_mtu_cached;
663 u32 child_mtu_cached;
668 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
670 dst_release(xdst->route);
671 if (likely(xdst->u.dst.xfrm))
672 xfrm_state_put(xdst->u.dst.xfrm);
673 #ifdef CONFIG_XFRM_SUB_POLICY
676 kfree(xdst->partner);
677 xdst->partner = NULL;
681 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
687 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
690 static inline struct sec_path *
691 secpath_get(struct sec_path *sp)
694 atomic_inc(&sp->refcnt);
698 extern void __secpath_destroy(struct sec_path *sp);
701 secpath_put(struct sec_path *sp)
703 if (sp && atomic_dec_and_test(&sp->refcnt))
704 __secpath_destroy(sp);
707 extern struct sec_path *secpath_dup(struct sec_path *src);
710 secpath_reset(struct sk_buff *skb)
713 secpath_put(skb->sp);
719 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
723 return addr->a4 == 0;
725 return ipv6_addr_any((struct in6_addr *)&addr->a6);
731 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
733 return (tmpl->saddr.a4 &&
734 tmpl->saddr.a4 != x->props.saddr.a4);
738 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
740 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
741 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
745 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
749 return __xfrm4_state_addr_cmp(tmpl, x);
751 return __xfrm6_state_addr_cmp(tmpl, x);
758 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
760 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
762 if (sk && sk->sk_policy[XFRM_POLICY_IN])
763 return __xfrm_policy_check(sk, dir, skb, family);
765 return (!xfrm_policy_count[dir] && !skb->sp) ||
766 (skb->dst->flags & DST_NOPOLICY) ||
767 __xfrm_policy_check(sk, dir, skb, family);
770 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
772 return xfrm_policy_check(sk, dir, skb, AF_INET);
775 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
777 return xfrm_policy_check(sk, dir, skb, AF_INET6);
780 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
781 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
783 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
785 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
786 (skb->dst->flags & DST_NOXFRM) ||
787 __xfrm_route_forward(skb, family);
790 static inline int xfrm4_route_forward(struct sk_buff *skb)
792 return xfrm_route_forward(skb, AF_INET);
795 static inline int xfrm6_route_forward(struct sk_buff *skb)
797 return xfrm_route_forward(skb, AF_INET6);
800 extern int __xfrm_sk_clone_policy(struct sock *sk);
802 static inline int xfrm_sk_clone_policy(struct sock *sk)
804 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
805 return __xfrm_sk_clone_policy(sk);
809 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
811 static inline void xfrm_sk_free_policy(struct sock *sk)
813 if (unlikely(sk->sk_policy[0] != NULL)) {
814 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
815 sk->sk_policy[0] = NULL;
817 if (unlikely(sk->sk_policy[1] != NULL)) {
818 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
819 sk->sk_policy[1] = NULL;
825 static inline void xfrm_sk_free_policy(struct sock *sk) {}
826 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
827 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
828 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
829 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
833 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
837 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
844 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
848 return (xfrm_address_t *)&fl->fl4_dst;
850 return (xfrm_address_t *)&fl->fl6_dst;
856 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
860 return (xfrm_address_t *)&fl->fl4_src;
862 return (xfrm_address_t *)&fl->fl6_src;
867 static __inline__ int
868 __xfrm4_state_addr_check(struct xfrm_state *x,
869 xfrm_address_t *daddr, xfrm_address_t *saddr)
871 if (daddr->a4 == x->id.daddr.a4 &&
872 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
877 static __inline__ int
878 __xfrm6_state_addr_check(struct xfrm_state *x,
879 xfrm_address_t *daddr, xfrm_address_t *saddr)
881 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
882 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
883 ipv6_addr_any((struct in6_addr *)saddr) ||
884 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
889 static __inline__ int
890 xfrm_state_addr_check(struct xfrm_state *x,
891 xfrm_address_t *daddr, xfrm_address_t *saddr,
892 unsigned short family)
896 return __xfrm4_state_addr_check(x, daddr, saddr);
898 return __xfrm6_state_addr_check(x, daddr, saddr);
903 static __inline__ int
904 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
905 unsigned short family)
909 return __xfrm4_state_addr_check(x,
910 (xfrm_address_t *)&fl->fl4_dst,
911 (xfrm_address_t *)&fl->fl4_src);
913 return __xfrm6_state_addr_check(x,
914 (xfrm_address_t *)&fl->fl6_dst,
915 (xfrm_address_t *)&fl->fl6_src);
920 static inline int xfrm_state_kern(struct xfrm_state *x)
922 return atomic_read(&x->tunnel_users);
925 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
927 return (!userproto || proto == userproto ||
928 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
929 proto == IPPROTO_ESP ||
930 proto == IPPROTO_COMP)));
934 * xfrm algorithm information
936 struct xfrm_algo_auth_info {
941 struct xfrm_algo_encr_info {
946 struct xfrm_algo_comp_info {
950 struct xfrm_algo_desc {
955 struct xfrm_algo_auth_info auth;
956 struct xfrm_algo_encr_info encr;
957 struct xfrm_algo_comp_info comp;
959 struct sadb_alg desc;
962 /* XFRM tunnel handlers. */
964 int (*handler)(struct sk_buff *skb);
965 int (*err_handler)(struct sk_buff *skb, __u32 info);
967 struct xfrm_tunnel *next;
971 struct xfrm6_tunnel {
972 int (*handler)(struct sk_buff *skb);
973 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
974 int type, int code, int offset, __be32 info);
975 struct xfrm6_tunnel *next;
979 extern void xfrm_init(void);
980 extern void xfrm4_init(void);
981 extern void xfrm6_init(void);
982 extern void xfrm6_fini(void);
983 extern void xfrm_state_init(void);
984 extern void xfrm4_state_init(void);
985 extern void xfrm6_state_init(void);
986 extern void xfrm6_state_fini(void);
988 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
989 extern struct xfrm_state *xfrm_state_alloc(void);
990 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
991 struct flowi *fl, struct xfrm_tmpl *tmpl,
992 struct xfrm_policy *pol, int *err,
993 unsigned short family);
994 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
995 xfrm_address_t *saddr,
996 unsigned short family,
997 u8 mode, u8 proto, u32 reqid);
998 extern int xfrm_state_check_expire(struct xfrm_state *x);
999 extern void xfrm_state_insert(struct xfrm_state *x);
1000 extern int xfrm_state_add(struct xfrm_state *x);
1001 extern int xfrm_state_update(struct xfrm_state *x);
1002 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1003 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1004 #ifdef CONFIG_XFRM_SUB_POLICY
1005 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1006 int n, unsigned short family);
1007 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1008 int n, unsigned short family);
1010 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1011 int n, unsigned short family)
1016 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1017 int n, unsigned short family)
1023 struct xfrmk_sadinfo {
1024 u32 sadhcnt; /* current hash bkts */
1025 u32 sadhmcnt; /* max allowed hash bkts */
1026 u32 sadcnt; /* current running count */
1029 struct xfrmk_spdinfo {
1040 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1041 extern int xfrm_state_delete(struct xfrm_state *x);
1042 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1043 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1044 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1045 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1046 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1047 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1048 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1049 extern int xfrm_init_state(struct xfrm_state *x);
1050 extern int xfrm_output(struct sk_buff *skb);
1051 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1053 extern int xfrm4_rcv(struct sk_buff *skb);
1055 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1057 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1060 extern int xfrm4_output(struct sk_buff *skb);
1061 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1062 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1063 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1064 extern int xfrm6_rcv(struct sk_buff *skb);
1065 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1066 xfrm_address_t *saddr, u8 proto);
1067 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1068 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1069 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1070 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1071 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1072 extern int xfrm6_output(struct sk_buff *skb);
1073 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1077 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1078 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1079 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1081 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1083 return -ENOPROTOOPT;
1086 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1088 /* should not happen */
1093 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1099 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1100 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1101 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1102 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1103 struct xfrm_selector *sel,
1104 struct xfrm_sec_ctx *ctx, int delete,
1106 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1107 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1108 u32 xfrm_get_acqseq(void);
1109 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1110 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1111 xfrm_address_t *daddr, xfrm_address_t *saddr,
1112 int create, unsigned short family);
1113 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1114 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1115 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1116 struct flowi *fl, int family, int strict);
1117 extern void xfrm_init_pmtu(struct dst_entry *dst);
1119 #ifdef CONFIG_XFRM_MIGRATE
1120 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1121 struct xfrm_migrate *m, int num_bundles);
1122 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1123 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1124 struct xfrm_migrate *m);
1125 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1126 struct xfrm_migrate *m, int num_bundles);
1129 extern wait_queue_head_t km_waitq;
1130 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1131 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1132 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1134 extern void xfrm_input_init(void);
1135 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1137 extern void xfrm_probe_algs(void);
1138 extern int xfrm_count_auth_supported(void);
1139 extern int xfrm_count_enc_supported(void);
1140 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1141 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1142 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1143 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1144 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1145 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1146 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1147 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1151 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1154 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1155 int offset, int len, icv_update_fn_t icv_update);
1157 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1163 return (__force __u32)a->a4 - (__force __u32)b->a4;
1165 return ipv6_addr_cmp((struct in6_addr *)a,
1166 (struct in6_addr *)b);
1170 static inline int xfrm_policy_id2dir(u32 index)
1175 static inline int xfrm_aevent_is_on(void)
1181 nlsk = rcu_dereference(xfrm_nl);
1183 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1188 #ifdef CONFIG_XFRM_MIGRATE
1189 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1191 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1194 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1197 for (i = 0; i < n; i++)
1198 xfrm_state_put(*(states + i));
1201 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1204 for (i = 0; i < n; i++)
1205 xfrm_state_delete(*(states + i));
1209 #endif /* _NET_XFRM_H */