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;
40 extern int sysctl_xfrm_larval_drop;
41 extern u32 sysctl_xfrm_acq_expires;
43 extern struct mutex xfrm_cfg_mutex;
45 /* Organization of SPD aka "XFRM rules"
46 ------------------------------------
49 - policy rule, struct xfrm_policy (=SPD entry)
50 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
51 - instance of a transformer, struct xfrm_state (=SA)
52 - template to clone xfrm_state, struct xfrm_tmpl
54 SPD is plain linear list of xfrm_policy rules, ordered by priority.
55 (To be compatible with existing pfkeyv2 implementations,
56 many rules with priority of 0x7fffffff are allowed to exist and
57 such rules are ordered in an unpredictable way, thanks to bsd folks.)
59 Lookup is plain linear search until the first match with selector.
61 If "action" is "block", then we prohibit the flow, otherwise:
62 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
63 policy entry has list of up to XFRM_MAX_DEPTH transformations,
64 described by templates xfrm_tmpl. Each template is resolved
65 to a complete xfrm_state (see below) and we pack bundle of transformations
66 to a dst_entry returned to requestor.
68 dst -. xfrm .-> xfrm_state #1
69 |---. child .-> dst -. xfrm .-> xfrm_state #2
70 |---. child .-> dst -. xfrm .-> xfrm_state #3
73 Bundles are cached at xrfm_policy struct (field ->bundles).
76 Resolution of xrfm_tmpl
77 -----------------------
79 1. ->mode Mode: transport or tunnel
80 2. ->id.proto Protocol: AH/ESP/IPCOMP
81 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
82 Q: allow to resolve security gateway?
83 4. ->id.spi If not zero, static SPI.
84 5. ->saddr Local tunnel endpoint, ignored for transport mode.
85 6. ->algos List of allowed algos. Plain bitmask now.
86 Q: ealgos, aalgos, calgos. What a mess...
87 7. ->share Sharing mode.
88 Q: how to implement private sharing mode? To add struct sock* to
91 Having this template we search through SAD searching for entries
92 with appropriate mode/proto/algo, permitted by selector.
93 If no appropriate entry found, it is requested from key manager.
96 Q: How to find all the bundles referring to a physical path for
97 PMTU discovery? Seems, dst should contain list of all parents...
98 and enter to infinite locking hierarchy disaster.
99 No! It is easier, we will not search for them, let them find us.
100 We add genid to each dst plus pointer to genid of raw IP route,
101 pmtu disc will update pmtu on raw IP route and increase its genid.
102 dst_check() will see this for top level and trigger resyncing
103 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
106 /* Full description of state of transformer. */
109 /* Note: bydst is re-used during gc */
110 struct hlist_node bydst;
111 struct hlist_node bysrc;
112 struct hlist_node byspi;
118 struct xfrm_selector sel;
122 /* Key manger bits */
129 /* Parameters of this state. */
134 u8 aalgo, ealgo, calgo;
137 xfrm_address_t saddr;
142 struct xfrm_lifetime_cfg lft;
144 /* Data for transformer */
145 struct xfrm_algo *aalg;
146 struct xfrm_algo *ealg;
147 struct xfrm_algo *calg;
149 /* Data for encapsulator */
150 struct xfrm_encap_tmpl *encap;
152 /* Data for care-of address */
153 xfrm_address_t *coaddr;
155 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
156 struct xfrm_state *tunnel;
158 /* If a tunnel, number of users + 1 */
159 atomic_t tunnel_users;
161 /* State for replay detection */
162 struct xfrm_replay_state replay;
164 /* Replay detection state at the time we sent the last notification */
165 struct xfrm_replay_state preplay;
167 /* internal flag that only holds state for delayed aevent at the
172 /* Replay detection notification settings */
176 /* Replay detection notification timer */
177 struct timer_list rtimer;
180 struct xfrm_stats stats;
182 struct xfrm_lifetime_cur curlft;
183 struct timer_list timer;
188 /* Reference to data common to all the instances of this
190 struct xfrm_type *type;
191 struct xfrm_mode *inner_mode;
192 struct xfrm_mode *outer_mode;
194 /* Security context */
195 struct xfrm_sec_ctx *security;
197 /* Private data of this transformer, format is opaque,
198 * interpreted by xfrm_type methods. */
202 /* xflags - make enum if more show up */
203 #define XFRM_TIME_DEFER 1
214 /* callback structure passed from either netlink or pfkey */
232 struct xfrm_policy_afinfo {
233 unsigned short family;
234 struct dst_ops *dst_ops;
235 void (*garbage_collect)(void);
236 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
237 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
238 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
239 int (*bundle_create)(struct xfrm_policy *policy,
240 struct xfrm_state **xfrm,
243 struct dst_entry **dst_p);
244 void (*decode_session)(struct sk_buff *skb,
248 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
249 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
250 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
251 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
254 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
255 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
256 extern int __xfrm_state_delete(struct xfrm_state *x);
258 struct xfrm_state_afinfo {
260 struct module *owner;
261 struct xfrm_type *type_map[IPPROTO_MAX];
262 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
263 int (*init_flags)(struct xfrm_state *x);
264 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
265 struct xfrm_tmpl *tmpl,
266 xfrm_address_t *daddr, xfrm_address_t *saddr);
267 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
268 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
269 int (*output)(struct sk_buff *skb);
272 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
273 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
275 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
280 struct module *owner;
283 #define XFRM_TYPE_NON_FRAGMENT 1
284 #define XFRM_TYPE_REPLAY_PROT 2
286 int (*init_state)(struct xfrm_state *x);
287 void (*destructor)(struct xfrm_state *);
288 int (*input)(struct xfrm_state *, struct sk_buff *skb);
289 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
290 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
291 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
292 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
293 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
294 /* Estimate maximal size of result of transformation of a dgram */
295 u32 (*get_mtu)(struct xfrm_state *, int size);
298 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
299 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
302 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
305 * Add encapsulation header.
307 * On exit, the transport header will be set to the start of the
308 * encapsulation header to be filled in by x->type->output and
309 * the mac header will be set to the nextheader (protocol for
310 * IPv4) field of the extension header directly preceding the
311 * encapsulation header, or in its absence, that of the top IP
312 * header. The value of the network header will always point
313 * to the top IP header while skb->data will point to the payload.
315 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
317 struct xfrm_state_afinfo *afinfo;
318 struct module *owner;
323 /* Flags for xfrm_mode. */
325 XFRM_MODE_FLAG_TUNNEL = 1,
328 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
329 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
333 /* id in template is interpreted as:
334 * daddr - destination of tunnel, may be zero for transport mode.
335 * spi - zero to acquire spi. Not zero if spi is static, then
336 * daddr must be fixed too.
337 * proto - AH/ESP/IPCOMP
341 /* Source address of tunnel. Ignored, if it is not a tunnel. */
342 xfrm_address_t saddr;
344 unsigned short encap_family;
348 /* Mode: transport, tunnel etc. */
351 /* Sharing mode: unique, this session only, this user only etc. */
354 /* May skip this transfomration if no SA is found */
357 /* Bit mask of algos allowed for acquisition */
363 #define XFRM_MAX_DEPTH 6
367 struct xfrm_policy *next;
368 struct hlist_node bydst;
369 struct hlist_node byidx;
371 /* This lock only affects elements except for entry. */
374 struct timer_list timer;
378 struct xfrm_selector selector;
379 struct xfrm_lifetime_cfg lft;
380 struct xfrm_lifetime_cur curlft;
381 struct dst_entry *bundles;
388 /* XXX 1 byte hole, try to pack */
389 struct xfrm_sec_ctx *security;
390 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
393 struct xfrm_migrate {
394 xfrm_address_t old_daddr;
395 xfrm_address_t old_saddr;
396 xfrm_address_t new_daddr;
397 xfrm_address_t new_saddr;
406 #define XFRM_KM_TIMEOUT 30
408 #define XFRM_REPLAY_SEQ 1
409 #define XFRM_REPLAY_OSEQ 2
410 #define XFRM_REPLAY_SEQ_MASK 3
412 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
413 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
415 /* default aevent timeout in units of 100ms */
416 #define XFRM_AE_ETIME 10
417 /* Async Event timer multiplier */
418 #define XFRM_AE_ETH_M 10
419 /* default seq threshold size */
420 #define XFRM_AE_SEQT_SIZE 2
424 struct list_head list;
426 int (*notify)(struct xfrm_state *x, struct km_event *c);
427 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
428 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
429 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
430 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
431 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
432 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
435 extern int xfrm_register_km(struct xfrm_mgr *km);
436 extern int xfrm_unregister_km(struct xfrm_mgr *km);
438 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
441 * This structure is used for the duration where packets are being
442 * transformed by IPsec. As soon as the packet leaves IPsec the
443 * area beyond the generic IP part may be overwritten.
447 struct inet_skb_parm h4;
448 struct inet6_skb_parm h6;
451 /* Sequence number for replay protection. */
455 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
457 /* Audit Information */
464 #ifdef CONFIG_AUDITSYSCALL
465 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
467 struct audit_buffer *audit_buf = NULL;
471 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
472 AUDIT_MAC_IPSEC_EVENT);
473 if (audit_buf == NULL)
476 audit_log_format(audit_buf, "auid=%u", auid);
479 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
480 audit_log_format(audit_buf, " subj=%s", secctx);
481 security_release_secctx(secctx, secctx_len);
483 audit_log_task_context(audit_buf);
487 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
489 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
491 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
493 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
496 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
497 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
498 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
499 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
500 #endif /* CONFIG_AUDITSYSCALL */
502 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
504 if (likely(policy != NULL))
505 atomic_inc(&policy->refcnt);
508 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
510 static inline void xfrm_pol_put(struct xfrm_policy *policy)
512 if (atomic_dec_and_test(&policy->refcnt))
513 __xfrm_policy_destroy(policy);
516 #ifdef CONFIG_XFRM_SUB_POLICY
517 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
520 for (i = npols - 1; i >= 0; --i)
521 xfrm_pol_put(pols[i]);
524 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
526 xfrm_pol_put(pols[0]);
530 extern void __xfrm_state_destroy(struct xfrm_state *);
532 static inline void __xfrm_state_put(struct xfrm_state *x)
534 atomic_dec(&x->refcnt);
537 static inline void xfrm_state_put(struct xfrm_state *x)
539 if (atomic_dec_and_test(&x->refcnt))
540 __xfrm_state_destroy(x);
543 static inline void xfrm_state_hold(struct xfrm_state *x)
545 atomic_inc(&x->refcnt);
548 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
555 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
556 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
559 if (memcmp(a1, a2, pdw << 2))
565 mask = htonl((0xffffffff) << (32 - pbi));
567 if ((a1[pdw] ^ a2[pdw]) & mask)
575 __be16 xfrm_flowi_sport(struct flowi *fl)
581 case IPPROTO_UDPLITE:
583 port = fl->fl_ip_sport;
587 port = htons(fl->fl_icmp_type);
590 port = htons(fl->fl_mh_type);
599 __be16 xfrm_flowi_dport(struct flowi *fl)
605 case IPPROTO_UDPLITE:
607 port = fl->fl_ip_dport;
611 port = htons(fl->fl_icmp_code);
619 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
620 unsigned short family);
622 #ifdef CONFIG_SECURITY_NETWORK_XFRM
623 /* If neither has a context --> match
624 * Otherwise, both must have a context and the sids, doi, alg must match
626 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
628 return ((!s1 && !s2) ||
630 (s1->ctx_sid == s2->ctx_sid) &&
631 (s1->ctx_doi == s2->ctx_doi) &&
632 (s1->ctx_alg == s2->ctx_alg)));
635 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
641 /* A struct encoding bundle of transformations to apply to some set of flow.
643 * dst->child points to the next element of bundle.
644 * dst->xfrm points to an instanse of transformer.
646 * Due to unfortunate limitations of current routing cache, which we
647 * have no time to fix, it mirrors struct rtable and bound to the same
648 * routing key, including saddr,daddr. However, we can have many of
649 * bundles differing by session id. All the bundles grow from a parent
655 struct dst_entry dst;
659 struct dst_entry *route;
660 #ifdef CONFIG_XFRM_SUB_POLICY
661 struct flowi *origin;
662 struct xfrm_selector *partner;
665 u32 route_mtu_cached;
666 u32 child_mtu_cached;
671 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
673 dst_release(xdst->route);
674 if (likely(xdst->u.dst.xfrm))
675 xfrm_state_put(xdst->u.dst.xfrm);
676 #ifdef CONFIG_XFRM_SUB_POLICY
679 kfree(xdst->partner);
680 xdst->partner = NULL;
684 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
690 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
693 static inline struct sec_path *
694 secpath_get(struct sec_path *sp)
697 atomic_inc(&sp->refcnt);
701 extern void __secpath_destroy(struct sec_path *sp);
704 secpath_put(struct sec_path *sp)
706 if (sp && atomic_dec_and_test(&sp->refcnt))
707 __secpath_destroy(sp);
710 extern struct sec_path *secpath_dup(struct sec_path *src);
713 secpath_reset(struct sk_buff *skb)
716 secpath_put(skb->sp);
722 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
726 return addr->a4 == 0;
728 return ipv6_addr_any((struct in6_addr *)&addr->a6);
734 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
736 return (tmpl->saddr.a4 &&
737 tmpl->saddr.a4 != x->props.saddr.a4);
741 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
743 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
744 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
748 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
752 return __xfrm4_state_addr_cmp(tmpl, x);
754 return __xfrm6_state_addr_cmp(tmpl, x);
761 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
763 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
765 if (sk && sk->sk_policy[XFRM_POLICY_IN])
766 return __xfrm_policy_check(sk, dir, skb, family);
768 return (!xfrm_policy_count[dir] && !skb->sp) ||
769 (skb->dst->flags & DST_NOPOLICY) ||
770 __xfrm_policy_check(sk, dir, skb, family);
773 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
775 return xfrm_policy_check(sk, dir, skb, AF_INET);
778 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
780 return xfrm_policy_check(sk, dir, skb, AF_INET6);
783 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
784 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
786 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
788 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
789 (skb->dst->flags & DST_NOXFRM) ||
790 __xfrm_route_forward(skb, family);
793 static inline int xfrm4_route_forward(struct sk_buff *skb)
795 return xfrm_route_forward(skb, AF_INET);
798 static inline int xfrm6_route_forward(struct sk_buff *skb)
800 return xfrm_route_forward(skb, AF_INET6);
803 extern int __xfrm_sk_clone_policy(struct sock *sk);
805 static inline int xfrm_sk_clone_policy(struct sock *sk)
807 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
808 return __xfrm_sk_clone_policy(sk);
812 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
814 static inline void xfrm_sk_free_policy(struct sock *sk)
816 if (unlikely(sk->sk_policy[0] != NULL)) {
817 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
818 sk->sk_policy[0] = NULL;
820 if (unlikely(sk->sk_policy[1] != NULL)) {
821 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
822 sk->sk_policy[1] = NULL;
828 static inline void xfrm_sk_free_policy(struct sock *sk) {}
829 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
830 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
831 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
832 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
836 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
840 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
847 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
851 return (xfrm_address_t *)&fl->fl4_dst;
853 return (xfrm_address_t *)&fl->fl6_dst;
859 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
863 return (xfrm_address_t *)&fl->fl4_src;
865 return (xfrm_address_t *)&fl->fl6_src;
870 static __inline__ int
871 __xfrm4_state_addr_check(struct xfrm_state *x,
872 xfrm_address_t *daddr, xfrm_address_t *saddr)
874 if (daddr->a4 == x->id.daddr.a4 &&
875 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
880 static __inline__ int
881 __xfrm6_state_addr_check(struct xfrm_state *x,
882 xfrm_address_t *daddr, xfrm_address_t *saddr)
884 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
885 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
886 ipv6_addr_any((struct in6_addr *)saddr) ||
887 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
892 static __inline__ int
893 xfrm_state_addr_check(struct xfrm_state *x,
894 xfrm_address_t *daddr, xfrm_address_t *saddr,
895 unsigned short family)
899 return __xfrm4_state_addr_check(x, daddr, saddr);
901 return __xfrm6_state_addr_check(x, daddr, saddr);
906 static __inline__ int
907 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
908 unsigned short family)
912 return __xfrm4_state_addr_check(x,
913 (xfrm_address_t *)&fl->fl4_dst,
914 (xfrm_address_t *)&fl->fl4_src);
916 return __xfrm6_state_addr_check(x,
917 (xfrm_address_t *)&fl->fl6_dst,
918 (xfrm_address_t *)&fl->fl6_src);
923 static inline int xfrm_state_kern(struct xfrm_state *x)
925 return atomic_read(&x->tunnel_users);
928 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
930 return (!userproto || proto == userproto ||
931 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
932 proto == IPPROTO_ESP ||
933 proto == IPPROTO_COMP)));
937 * xfrm algorithm information
939 struct xfrm_algo_auth_info {
944 struct xfrm_algo_encr_info {
949 struct xfrm_algo_comp_info {
953 struct xfrm_algo_desc {
958 struct xfrm_algo_auth_info auth;
959 struct xfrm_algo_encr_info encr;
960 struct xfrm_algo_comp_info comp;
962 struct sadb_alg desc;
965 /* XFRM tunnel handlers. */
967 int (*handler)(struct sk_buff *skb);
968 int (*err_handler)(struct sk_buff *skb, __u32 info);
970 struct xfrm_tunnel *next;
974 struct xfrm6_tunnel {
975 int (*handler)(struct sk_buff *skb);
976 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
977 int type, int code, int offset, __be32 info);
978 struct xfrm6_tunnel *next;
982 extern void xfrm_init(void);
983 extern void xfrm4_init(void);
984 extern void xfrm6_init(void);
985 extern void xfrm6_fini(void);
986 extern void xfrm_state_init(void);
987 extern void xfrm4_state_init(void);
988 extern void xfrm6_state_init(void);
989 extern void xfrm6_state_fini(void);
991 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
992 extern struct xfrm_state *xfrm_state_alloc(void);
993 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
994 struct flowi *fl, struct xfrm_tmpl *tmpl,
995 struct xfrm_policy *pol, int *err,
996 unsigned short family);
997 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
998 xfrm_address_t *saddr,
999 unsigned short family,
1000 u8 mode, u8 proto, u32 reqid);
1001 extern int xfrm_state_check_expire(struct xfrm_state *x);
1002 extern void xfrm_state_insert(struct xfrm_state *x);
1003 extern int xfrm_state_add(struct xfrm_state *x);
1004 extern int xfrm_state_update(struct xfrm_state *x);
1005 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1006 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1007 #ifdef CONFIG_XFRM_SUB_POLICY
1008 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1009 int n, unsigned short family);
1010 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1011 int n, unsigned short family);
1013 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1014 int n, unsigned short family)
1019 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1020 int n, unsigned short family)
1026 struct xfrmk_sadinfo {
1027 u32 sadhcnt; /* current hash bkts */
1028 u32 sadhmcnt; /* max allowed hash bkts */
1029 u32 sadcnt; /* current running count */
1032 struct xfrmk_spdinfo {
1043 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1044 extern int xfrm_state_delete(struct xfrm_state *x);
1045 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1046 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1047 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1048 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1049 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1050 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1051 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1052 extern int xfrm_init_state(struct xfrm_state *x);
1053 extern int xfrm_output(struct sk_buff *skb);
1054 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1056 extern int xfrm4_rcv(struct sk_buff *skb);
1058 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1060 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1063 extern int xfrm4_output(struct sk_buff *skb);
1064 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1065 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1066 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1067 extern int xfrm6_rcv(struct sk_buff *skb);
1068 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1069 xfrm_address_t *saddr, u8 proto);
1070 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1071 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1072 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1073 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1074 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1075 extern int xfrm6_output(struct sk_buff *skb);
1076 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1080 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1081 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1082 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1084 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1086 return -ENOPROTOOPT;
1089 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1091 /* should not happen */
1096 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1102 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1103 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1104 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1105 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1106 struct xfrm_selector *sel,
1107 struct xfrm_sec_ctx *ctx, int delete,
1109 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1110 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1111 u32 xfrm_get_acqseq(void);
1112 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1113 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1114 xfrm_address_t *daddr, xfrm_address_t *saddr,
1115 int create, unsigned short family);
1116 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1117 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1118 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1119 struct flowi *fl, int family, int strict);
1120 extern void xfrm_init_pmtu(struct dst_entry *dst);
1122 #ifdef CONFIG_XFRM_MIGRATE
1123 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1124 struct xfrm_migrate *m, int num_bundles);
1125 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1126 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1127 struct xfrm_migrate *m);
1128 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1129 struct xfrm_migrate *m, int num_bundles);
1132 extern wait_queue_head_t km_waitq;
1133 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1134 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1135 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1137 extern void xfrm_input_init(void);
1138 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1140 extern void xfrm_probe_algs(void);
1141 extern int xfrm_count_auth_supported(void);
1142 extern int xfrm_count_enc_supported(void);
1143 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1144 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1145 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1146 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1147 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1148 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1149 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1150 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1154 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1157 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1158 int offset, int len, icv_update_fn_t icv_update);
1160 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1166 return (__force __u32)a->a4 - (__force __u32)b->a4;
1168 return ipv6_addr_cmp((struct in6_addr *)a,
1169 (struct in6_addr *)b);
1173 static inline int xfrm_policy_id2dir(u32 index)
1178 static inline int xfrm_aevent_is_on(void)
1184 nlsk = rcu_dereference(xfrm_nl);
1186 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1191 #ifdef CONFIG_XFRM_MIGRATE
1192 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1194 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1197 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1200 for (i = 0; i < n; i++)
1201 xfrm_state_put(*(states + i));
1204 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1207 for (i = 0; i < n; i++)
1208 xfrm_state_delete(*(states + i));
1212 #endif /* _NET_XFRM_H */