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 xfrm_type *type_map[IPPROTO_MAX];
232 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
233 struct dst_ops *dst_ops;
234 void (*garbage_collect)(void);
235 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
236 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
237 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
238 int (*bundle_create)(struct xfrm_policy *policy,
239 struct xfrm_state **xfrm,
242 struct dst_entry **dst_p);
243 void (*decode_session)(struct sk_buff *skb,
247 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
248 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
249 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
250 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
253 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
254 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
255 extern int __xfrm_state_delete(struct xfrm_state *x);
257 struct xfrm_state_afinfo {
258 unsigned short family;
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);
298 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
299 extern void xfrm_put_type(struct xfrm_type *type);
302 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
303 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
305 struct module *owner;
309 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
310 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
311 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
312 extern void xfrm_put_mode(struct xfrm_mode *mode);
316 /* id in template is interpreted as:
317 * daddr - destination of tunnel, may be zero for transport mode.
318 * spi - zero to acquire spi. Not zero if spi is static, then
319 * daddr must be fixed too.
320 * proto - AH/ESP/IPCOMP
324 /* Source address of tunnel. Ignored, if it is not a tunnel. */
325 xfrm_address_t saddr;
327 unsigned short encap_family;
331 /* Mode: transport, tunnel etc. */
334 /* Sharing mode: unique, this session only, this user only etc. */
337 /* May skip this transfomration if no SA is found */
340 /* Bit mask of algos allowed for acquisition */
346 #define XFRM_MAX_DEPTH 6
350 struct xfrm_policy *next;
351 struct hlist_node bydst;
352 struct hlist_node byidx;
354 /* This lock only affects elements except for entry. */
357 struct timer_list timer;
361 struct xfrm_selector selector;
362 struct xfrm_lifetime_cfg lft;
363 struct xfrm_lifetime_cur curlft;
364 struct dst_entry *bundles;
371 /* XXX 1 byte hole, try to pack */
372 struct xfrm_sec_ctx *security;
373 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
376 struct xfrm_migrate {
377 xfrm_address_t old_daddr;
378 xfrm_address_t old_saddr;
379 xfrm_address_t new_daddr;
380 xfrm_address_t new_saddr;
389 #define XFRM_KM_TIMEOUT 30
391 #define XFRM_REPLAY_SEQ 1
392 #define XFRM_REPLAY_OSEQ 2
393 #define XFRM_REPLAY_SEQ_MASK 3
395 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
396 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
398 /* default aevent timeout in units of 100ms */
399 #define XFRM_AE_ETIME 10
400 /* Async Event timer multiplier */
401 #define XFRM_AE_ETH_M 10
402 /* default seq threshold size */
403 #define XFRM_AE_SEQT_SIZE 2
407 struct list_head list;
409 int (*notify)(struct xfrm_state *x, struct km_event *c);
410 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
411 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
412 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
413 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
414 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
415 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
418 extern int xfrm_register_km(struct xfrm_mgr *km);
419 extern int xfrm_unregister_km(struct xfrm_mgr *km);
421 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
424 * This structure is used for the duration where packets are being
425 * transformed by IPsec. As soon as the packet leaves IPsec the
426 * area beyond the generic IP part may be overwritten.
430 struct inet_skb_parm h4;
431 struct inet6_skb_parm h6;
434 /* Sequence number for replay protection. */
438 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
440 /* Audit Information */
447 #ifdef CONFIG_AUDITSYSCALL
448 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
450 struct audit_buffer *audit_buf = NULL;
454 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
455 AUDIT_MAC_IPSEC_EVENT);
456 if (audit_buf == NULL)
459 audit_log_format(audit_buf, "auid=%u", auid);
462 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
463 audit_log_format(audit_buf, " subj=%s", secctx);
464 security_release_secctx(secctx, secctx_len);
466 audit_log_task_context(audit_buf);
470 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
472 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
474 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
476 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
479 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
480 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
481 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
482 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
483 #endif /* CONFIG_AUDITSYSCALL */
485 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
487 if (likely(policy != NULL))
488 atomic_inc(&policy->refcnt);
491 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
493 static inline void xfrm_pol_put(struct xfrm_policy *policy)
495 if (atomic_dec_and_test(&policy->refcnt))
496 __xfrm_policy_destroy(policy);
499 #ifdef CONFIG_XFRM_SUB_POLICY
500 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
503 for (i = npols - 1; i >= 0; --i)
504 xfrm_pol_put(pols[i]);
507 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
509 xfrm_pol_put(pols[0]);
513 extern void __xfrm_state_destroy(struct xfrm_state *);
515 static inline void __xfrm_state_put(struct xfrm_state *x)
517 atomic_dec(&x->refcnt);
520 static inline void xfrm_state_put(struct xfrm_state *x)
522 if (atomic_dec_and_test(&x->refcnt))
523 __xfrm_state_destroy(x);
526 static inline void xfrm_state_hold(struct xfrm_state *x)
528 atomic_inc(&x->refcnt);
531 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
538 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
539 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
542 if (memcmp(a1, a2, pdw << 2))
548 mask = htonl((0xffffffff) << (32 - pbi));
550 if ((a1[pdw] ^ a2[pdw]) & mask)
558 __be16 xfrm_flowi_sport(struct flowi *fl)
564 case IPPROTO_UDPLITE:
566 port = fl->fl_ip_sport;
570 port = htons(fl->fl_icmp_type);
573 port = htons(fl->fl_mh_type);
582 __be16 xfrm_flowi_dport(struct flowi *fl)
588 case IPPROTO_UDPLITE:
590 port = fl->fl_ip_dport;
594 port = htons(fl->fl_icmp_code);
602 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
603 unsigned short family);
605 #ifdef CONFIG_SECURITY_NETWORK_XFRM
606 /* If neither has a context --> match
607 * Otherwise, both must have a context and the sids, doi, alg must match
609 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
611 return ((!s1 && !s2) ||
613 (s1->ctx_sid == s2->ctx_sid) &&
614 (s1->ctx_doi == s2->ctx_doi) &&
615 (s1->ctx_alg == s2->ctx_alg)));
618 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
624 /* A struct encoding bundle of transformations to apply to some set of flow.
626 * dst->child points to the next element of bundle.
627 * dst->xfrm points to an instanse of transformer.
629 * Due to unfortunate limitations of current routing cache, which we
630 * have no time to fix, it mirrors struct rtable and bound to the same
631 * routing key, including saddr,daddr. However, we can have many of
632 * bundles differing by session id. All the bundles grow from a parent
638 struct dst_entry dst;
642 struct dst_entry *route;
643 #ifdef CONFIG_XFRM_SUB_POLICY
644 struct flowi *origin;
645 struct xfrm_selector *partner;
648 u32 route_mtu_cached;
649 u32 child_mtu_cached;
654 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
656 dst_release(xdst->route);
657 if (likely(xdst->u.dst.xfrm))
658 xfrm_state_put(xdst->u.dst.xfrm);
659 #ifdef CONFIG_XFRM_SUB_POLICY
662 kfree(xdst->partner);
663 xdst->partner = NULL;
667 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
673 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
676 static inline struct sec_path *
677 secpath_get(struct sec_path *sp)
680 atomic_inc(&sp->refcnt);
684 extern void __secpath_destroy(struct sec_path *sp);
687 secpath_put(struct sec_path *sp)
689 if (sp && atomic_dec_and_test(&sp->refcnt))
690 __secpath_destroy(sp);
693 extern struct sec_path *secpath_dup(struct sec_path *src);
696 secpath_reset(struct sk_buff *skb)
699 secpath_put(skb->sp);
705 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
709 return addr->a4 == 0;
711 return ipv6_addr_any((struct in6_addr *)&addr->a6);
717 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
719 return (tmpl->saddr.a4 &&
720 tmpl->saddr.a4 != x->props.saddr.a4);
724 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
726 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
727 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
731 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
735 return __xfrm4_state_addr_cmp(tmpl, x);
737 return __xfrm6_state_addr_cmp(tmpl, x);
744 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
746 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
748 if (sk && sk->sk_policy[XFRM_POLICY_IN])
749 return __xfrm_policy_check(sk, dir, skb, family);
751 return (!xfrm_policy_count[dir] && !skb->sp) ||
752 (skb->dst->flags & DST_NOPOLICY) ||
753 __xfrm_policy_check(sk, dir, skb, family);
756 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
758 return xfrm_policy_check(sk, dir, skb, AF_INET);
761 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
763 return xfrm_policy_check(sk, dir, skb, AF_INET6);
766 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
767 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
769 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
771 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
772 (skb->dst->flags & DST_NOXFRM) ||
773 __xfrm_route_forward(skb, family);
776 static inline int xfrm4_route_forward(struct sk_buff *skb)
778 return xfrm_route_forward(skb, AF_INET);
781 static inline int xfrm6_route_forward(struct sk_buff *skb)
783 return xfrm_route_forward(skb, AF_INET6);
786 extern int __xfrm_sk_clone_policy(struct sock *sk);
788 static inline int xfrm_sk_clone_policy(struct sock *sk)
790 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
791 return __xfrm_sk_clone_policy(sk);
795 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
797 static inline void xfrm_sk_free_policy(struct sock *sk)
799 if (unlikely(sk->sk_policy[0] != NULL)) {
800 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
801 sk->sk_policy[0] = NULL;
803 if (unlikely(sk->sk_policy[1] != NULL)) {
804 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
805 sk->sk_policy[1] = NULL;
811 static inline void xfrm_sk_free_policy(struct sock *sk) {}
812 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
813 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
814 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
815 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
819 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
823 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
830 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
834 return (xfrm_address_t *)&fl->fl4_dst;
836 return (xfrm_address_t *)&fl->fl6_dst;
842 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
846 return (xfrm_address_t *)&fl->fl4_src;
848 return (xfrm_address_t *)&fl->fl6_src;
853 static __inline__ int
854 __xfrm4_state_addr_check(struct xfrm_state *x,
855 xfrm_address_t *daddr, xfrm_address_t *saddr)
857 if (daddr->a4 == x->id.daddr.a4 &&
858 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
863 static __inline__ int
864 __xfrm6_state_addr_check(struct xfrm_state *x,
865 xfrm_address_t *daddr, xfrm_address_t *saddr)
867 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
868 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
869 ipv6_addr_any((struct in6_addr *)saddr) ||
870 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
875 static __inline__ int
876 xfrm_state_addr_check(struct xfrm_state *x,
877 xfrm_address_t *daddr, xfrm_address_t *saddr,
878 unsigned short family)
882 return __xfrm4_state_addr_check(x, daddr, saddr);
884 return __xfrm6_state_addr_check(x, daddr, saddr);
889 static __inline__ int
890 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
891 unsigned short family)
895 return __xfrm4_state_addr_check(x,
896 (xfrm_address_t *)&fl->fl4_dst,
897 (xfrm_address_t *)&fl->fl4_src);
899 return __xfrm6_state_addr_check(x,
900 (xfrm_address_t *)&fl->fl6_dst,
901 (xfrm_address_t *)&fl->fl6_src);
906 static inline int xfrm_state_kern(struct xfrm_state *x)
908 return atomic_read(&x->tunnel_users);
911 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
913 return (!userproto || proto == userproto ||
914 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
915 proto == IPPROTO_ESP ||
916 proto == IPPROTO_COMP)));
920 * xfrm algorithm information
922 struct xfrm_algo_auth_info {
927 struct xfrm_algo_encr_info {
932 struct xfrm_algo_comp_info {
936 struct xfrm_algo_desc {
941 struct xfrm_algo_auth_info auth;
942 struct xfrm_algo_encr_info encr;
943 struct xfrm_algo_comp_info comp;
945 struct sadb_alg desc;
948 /* XFRM tunnel handlers. */
950 int (*handler)(struct sk_buff *skb);
951 int (*err_handler)(struct sk_buff *skb, __u32 info);
953 struct xfrm_tunnel *next;
957 struct xfrm6_tunnel {
958 int (*handler)(struct sk_buff *skb);
959 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
960 int type, int code, int offset, __be32 info);
961 struct xfrm6_tunnel *next;
965 extern void xfrm_init(void);
966 extern void xfrm4_init(void);
967 extern void xfrm6_init(void);
968 extern void xfrm6_fini(void);
969 extern void xfrm_state_init(void);
970 extern void xfrm4_state_init(void);
971 extern void xfrm6_state_init(void);
972 extern void xfrm6_state_fini(void);
974 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
975 extern struct xfrm_state *xfrm_state_alloc(void);
976 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
977 struct flowi *fl, struct xfrm_tmpl *tmpl,
978 struct xfrm_policy *pol, int *err,
979 unsigned short family);
980 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
981 xfrm_address_t *saddr,
982 unsigned short family,
983 u8 mode, u8 proto, u32 reqid);
984 extern int xfrm_state_check_expire(struct xfrm_state *x);
985 extern void xfrm_state_insert(struct xfrm_state *x);
986 extern int xfrm_state_add(struct xfrm_state *x);
987 extern int xfrm_state_update(struct xfrm_state *x);
988 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
989 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
990 #ifdef CONFIG_XFRM_SUB_POLICY
991 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
992 int n, unsigned short family);
993 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
994 int n, unsigned short family);
996 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
997 int n, unsigned short family)
1002 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1003 int n, unsigned short family)
1009 struct xfrmk_sadinfo {
1010 u32 sadhcnt; /* current hash bkts */
1011 u32 sadhmcnt; /* max allowed hash bkts */
1012 u32 sadcnt; /* current running count */
1015 struct xfrmk_spdinfo {
1026 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1027 extern int xfrm_state_delete(struct xfrm_state *x);
1028 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1029 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1030 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1031 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1032 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1033 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1034 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1035 extern int xfrm_init_state(struct xfrm_state *x);
1036 extern int xfrm_output(struct sk_buff *skb);
1037 extern int xfrm4_rcv(struct sk_buff *skb);
1038 extern int xfrm4_output(struct sk_buff *skb);
1039 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1040 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1041 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
1042 extern int xfrm6_rcv(struct sk_buff **pskb);
1043 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1044 xfrm_address_t *saddr, u8 proto);
1045 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1046 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1047 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1048 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1049 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1050 extern int xfrm6_output(struct sk_buff *skb);
1051 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1055 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1056 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1057 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1059 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1061 return -ENOPROTOOPT;
1064 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1066 /* should not happen */
1071 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1077 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1078 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1079 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1080 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1081 struct xfrm_selector *sel,
1082 struct xfrm_sec_ctx *ctx, int delete,
1084 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1085 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1086 u32 xfrm_get_acqseq(void);
1087 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1088 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1089 xfrm_address_t *daddr, xfrm_address_t *saddr,
1090 int create, unsigned short family);
1091 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1092 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1093 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1094 struct flowi *fl, int family, int strict);
1095 extern void xfrm_init_pmtu(struct dst_entry *dst);
1097 #ifdef CONFIG_XFRM_MIGRATE
1098 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1099 struct xfrm_migrate *m, int num_bundles);
1100 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1101 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1102 struct xfrm_migrate *m);
1103 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1104 struct xfrm_migrate *m, int num_bundles);
1107 extern wait_queue_head_t km_waitq;
1108 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1109 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1110 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1112 extern void xfrm_input_init(void);
1113 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1115 extern void xfrm_probe_algs(void);
1116 extern int xfrm_count_auth_supported(void);
1117 extern int xfrm_count_enc_supported(void);
1118 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1119 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1120 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1121 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1122 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1123 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1124 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1125 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1129 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1132 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1133 int offset, int len, icv_update_fn_t icv_update);
1135 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1141 return (__force __u32)a->a4 - (__force __u32)b->a4;
1143 return ipv6_addr_cmp((struct in6_addr *)a,
1144 (struct in6_addr *)b);
1148 static inline int xfrm_policy_id2dir(u32 index)
1153 static inline int xfrm_aevent_is_on(void)
1159 nlsk = rcu_dereference(xfrm_nl);
1161 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1166 #ifdef CONFIG_XFRM_MIGRATE
1167 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1169 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1172 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1175 for (i = 0; i < n; i++)
1176 xfrm_state_put(*(states + i));
1179 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1182 for (i = 0; i < n; i++)
1183 xfrm_state_delete(*(states + i));
1187 #endif /* _NET_XFRM_H */