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 */
233 struct xfrm_policy_afinfo {
234 unsigned short family;
235 struct dst_ops *dst_ops;
236 void (*garbage_collect)(void);
237 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
238 xfrm_address_t *daddr);
239 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
240 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
241 void (*decode_session)(struct sk_buff *skb,
243 int (*get_tos)(struct flowi *fl);
244 int (*fill_dst)(struct xfrm_dst *xdst,
245 struct net_device *dev);
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 {
261 struct module *owner;
262 struct xfrm_type *type_map[IPPROTO_MAX];
263 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
264 int (*init_flags)(struct xfrm_state *x);
265 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
266 struct xfrm_tmpl *tmpl,
267 xfrm_address_t *daddr, xfrm_address_t *saddr);
268 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
269 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
270 int (*output)(struct sk_buff *skb);
271 int (*extract_output)(struct xfrm_state *x,
272 struct sk_buff *skb);
275 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
276 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
278 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
283 struct module *owner;
286 #define XFRM_TYPE_NON_FRAGMENT 1
287 #define XFRM_TYPE_REPLAY_PROT 2
288 #define XFRM_TYPE_LOCAL_COADDR 4
289 #define XFRM_TYPE_REMOTE_COADDR 8
291 int (*init_state)(struct xfrm_state *x);
292 void (*destructor)(struct xfrm_state *);
293 int (*input)(struct xfrm_state *, struct sk_buff *skb);
294 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
295 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
296 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
297 /* Estimate maximal size of result of transformation of a dgram */
298 u32 (*get_mtu)(struct xfrm_state *, int size);
301 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
302 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
305 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
308 * Add encapsulation header.
310 * On exit, the transport header will be set to the start of the
311 * encapsulation header to be filled in by x->type->output and
312 * the mac header will be set to the nextheader (protocol for
313 * IPv4) field of the extension header directly preceding the
314 * encapsulation header, or in its absence, that of the top IP
315 * header. The value of the network header will always point
316 * to the top IP header while skb->data will point to the payload.
318 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
321 * This is the actual output entry point.
323 * For transport mode and equivalent this would be identical to
324 * output2 (which does not need to be set). While tunnel mode
325 * and equivalent would set this to a tunnel encapsulation function
326 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
329 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
331 struct xfrm_state_afinfo *afinfo;
332 struct module *owner;
337 /* Flags for xfrm_mode. */
339 XFRM_MODE_FLAG_TUNNEL = 1,
342 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
343 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
347 /* id in template is interpreted as:
348 * daddr - destination of tunnel, may be zero for transport mode.
349 * spi - zero to acquire spi. Not zero if spi is static, then
350 * daddr must be fixed too.
351 * proto - AH/ESP/IPCOMP
355 /* Source address of tunnel. Ignored, if it is not a tunnel. */
356 xfrm_address_t saddr;
358 unsigned short encap_family;
362 /* Mode: transport, tunnel etc. */
365 /* Sharing mode: unique, this session only, this user only etc. */
368 /* May skip this transfomration if no SA is found */
371 /* Bit mask of algos allowed for acquisition */
377 #define XFRM_MAX_DEPTH 6
381 struct xfrm_policy *next;
382 struct hlist_node bydst;
383 struct hlist_node byidx;
385 /* This lock only affects elements except for entry. */
388 struct timer_list timer;
392 struct xfrm_selector selector;
393 struct xfrm_lifetime_cfg lft;
394 struct xfrm_lifetime_cur curlft;
395 struct dst_entry *bundles;
402 /* XXX 1 byte hole, try to pack */
403 struct xfrm_sec_ctx *security;
404 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
407 struct xfrm_migrate {
408 xfrm_address_t old_daddr;
409 xfrm_address_t old_saddr;
410 xfrm_address_t new_daddr;
411 xfrm_address_t new_saddr;
420 #define XFRM_KM_TIMEOUT 30
422 #define XFRM_REPLAY_SEQ 1
423 #define XFRM_REPLAY_OSEQ 2
424 #define XFRM_REPLAY_SEQ_MASK 3
426 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
427 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
429 /* default aevent timeout in units of 100ms */
430 #define XFRM_AE_ETIME 10
431 /* Async Event timer multiplier */
432 #define XFRM_AE_ETH_M 10
433 /* default seq threshold size */
434 #define XFRM_AE_SEQT_SIZE 2
438 struct list_head list;
440 int (*notify)(struct xfrm_state *x, struct km_event *c);
441 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
442 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
443 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
444 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
445 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
446 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
449 extern int xfrm_register_km(struct xfrm_mgr *km);
450 extern int xfrm_unregister_km(struct xfrm_mgr *km);
452 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
455 * This structure is used for the duration where packets are being
456 * transformed by IPsec. As soon as the packet leaves IPsec the
457 * area beyond the generic IP part may be overwritten.
461 struct inet_skb_parm h4;
462 struct inet6_skb_parm h6;
465 /* Sequence number for replay protection. */
469 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
472 * This structure is used by the afinfo prepare_input/prepare_output functions
473 * to transmit header information to the mode input/output functions.
475 struct xfrm_mode_skb_cb {
477 struct inet_skb_parm h4;
478 struct inet6_skb_parm h6;
481 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
485 /* TOS for IPv4, class for IPv6. */
488 /* TTL for IPv4, hop limitfor IPv6. */
491 /* Protocol for IPv4, NH for IPv6. */
494 /* Used by IPv6 only, zero for IPv4. */
498 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
500 /* Audit Information */
507 #ifdef CONFIG_AUDITSYSCALL
508 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
510 struct audit_buffer *audit_buf = NULL;
514 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
515 AUDIT_MAC_IPSEC_EVENT);
516 if (audit_buf == NULL)
519 audit_log_format(audit_buf, "auid=%u", auid);
522 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
523 audit_log_format(audit_buf, " subj=%s", secctx);
524 security_release_secctx(secctx, secctx_len);
526 audit_log_task_context(audit_buf);
530 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
532 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
534 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
536 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
539 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
540 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
541 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
542 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
543 #endif /* CONFIG_AUDITSYSCALL */
545 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
547 if (likely(policy != NULL))
548 atomic_inc(&policy->refcnt);
551 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
553 static inline void xfrm_pol_put(struct xfrm_policy *policy)
555 if (atomic_dec_and_test(&policy->refcnt))
556 __xfrm_policy_destroy(policy);
559 #ifdef CONFIG_XFRM_SUB_POLICY
560 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
563 for (i = npols - 1; i >= 0; --i)
564 xfrm_pol_put(pols[i]);
567 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
569 xfrm_pol_put(pols[0]);
573 extern void __xfrm_state_destroy(struct xfrm_state *);
575 static inline void __xfrm_state_put(struct xfrm_state *x)
577 atomic_dec(&x->refcnt);
580 static inline void xfrm_state_put(struct xfrm_state *x)
582 if (atomic_dec_and_test(&x->refcnt))
583 __xfrm_state_destroy(x);
586 static inline void xfrm_state_hold(struct xfrm_state *x)
588 atomic_inc(&x->refcnt);
591 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
598 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
599 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
602 if (memcmp(a1, a2, pdw << 2))
608 mask = htonl((0xffffffff) << (32 - pbi));
610 if ((a1[pdw] ^ a2[pdw]) & mask)
618 __be16 xfrm_flowi_sport(struct flowi *fl)
624 case IPPROTO_UDPLITE:
626 port = fl->fl_ip_sport;
630 port = htons(fl->fl_icmp_type);
633 port = htons(fl->fl_mh_type);
642 __be16 xfrm_flowi_dport(struct flowi *fl)
648 case IPPROTO_UDPLITE:
650 port = fl->fl_ip_dport;
654 port = htons(fl->fl_icmp_code);
662 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
663 unsigned short family);
665 #ifdef CONFIG_SECURITY_NETWORK_XFRM
666 /* If neither has a context --> match
667 * Otherwise, both must have a context and the sids, doi, alg must match
669 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
671 return ((!s1 && !s2) ||
673 (s1->ctx_sid == s2->ctx_sid) &&
674 (s1->ctx_doi == s2->ctx_doi) &&
675 (s1->ctx_alg == s2->ctx_alg)));
678 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
684 /* A struct encoding bundle of transformations to apply to some set of flow.
686 * dst->child points to the next element of bundle.
687 * dst->xfrm points to an instanse of transformer.
689 * Due to unfortunate limitations of current routing cache, which we
690 * have no time to fix, it mirrors struct rtable and bound to the same
691 * routing key, including saddr,daddr. However, we can have many of
692 * bundles differing by session id. All the bundles grow from a parent
698 struct dst_entry dst;
702 struct dst_entry *route;
703 #ifdef CONFIG_XFRM_SUB_POLICY
704 struct flowi *origin;
705 struct xfrm_selector *partner;
708 u32 route_mtu_cached;
709 u32 child_mtu_cached;
714 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
716 dst_release(xdst->route);
717 if (likely(xdst->u.dst.xfrm))
718 xfrm_state_put(xdst->u.dst.xfrm);
719 #ifdef CONFIG_XFRM_SUB_POLICY
722 kfree(xdst->partner);
723 xdst->partner = NULL;
727 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
733 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
736 static inline struct sec_path *
737 secpath_get(struct sec_path *sp)
740 atomic_inc(&sp->refcnt);
744 extern void __secpath_destroy(struct sec_path *sp);
747 secpath_put(struct sec_path *sp)
749 if (sp && atomic_dec_and_test(&sp->refcnt))
750 __secpath_destroy(sp);
753 extern struct sec_path *secpath_dup(struct sec_path *src);
756 secpath_reset(struct sk_buff *skb)
759 secpath_put(skb->sp);
765 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
769 return addr->a4 == 0;
771 return ipv6_addr_any((struct in6_addr *)&addr->a6);
777 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
779 return (tmpl->saddr.a4 &&
780 tmpl->saddr.a4 != x->props.saddr.a4);
784 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
786 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
787 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
791 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
795 return __xfrm4_state_addr_cmp(tmpl, x);
797 return __xfrm6_state_addr_cmp(tmpl, x);
804 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
806 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
808 if (sk && sk->sk_policy[XFRM_POLICY_IN])
809 return __xfrm_policy_check(sk, dir, skb, family);
811 return (!xfrm_policy_count[dir] && !skb->sp) ||
812 (skb->dst->flags & DST_NOPOLICY) ||
813 __xfrm_policy_check(sk, dir, skb, family);
816 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
818 return xfrm_policy_check(sk, dir, skb, AF_INET);
821 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
823 return xfrm_policy_check(sk, dir, skb, AF_INET6);
826 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
827 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
829 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
831 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
832 (skb->dst->flags & DST_NOXFRM) ||
833 __xfrm_route_forward(skb, family);
836 static inline int xfrm4_route_forward(struct sk_buff *skb)
838 return xfrm_route_forward(skb, AF_INET);
841 static inline int xfrm6_route_forward(struct sk_buff *skb)
843 return xfrm_route_forward(skb, AF_INET6);
846 extern int __xfrm_sk_clone_policy(struct sock *sk);
848 static inline int xfrm_sk_clone_policy(struct sock *sk)
850 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
851 return __xfrm_sk_clone_policy(sk);
855 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
857 static inline void xfrm_sk_free_policy(struct sock *sk)
859 if (unlikely(sk->sk_policy[0] != NULL)) {
860 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
861 sk->sk_policy[0] = NULL;
863 if (unlikely(sk->sk_policy[1] != NULL)) {
864 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
865 sk->sk_policy[1] = NULL;
871 static inline void xfrm_sk_free_policy(struct sock *sk) {}
872 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
873 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
874 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
875 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
879 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
883 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
890 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
894 return (xfrm_address_t *)&fl->fl4_dst;
896 return (xfrm_address_t *)&fl->fl6_dst;
902 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
906 return (xfrm_address_t *)&fl->fl4_src;
908 return (xfrm_address_t *)&fl->fl6_src;
913 static __inline__ int
914 __xfrm4_state_addr_check(struct xfrm_state *x,
915 xfrm_address_t *daddr, xfrm_address_t *saddr)
917 if (daddr->a4 == x->id.daddr.a4 &&
918 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
923 static __inline__ int
924 __xfrm6_state_addr_check(struct xfrm_state *x,
925 xfrm_address_t *daddr, xfrm_address_t *saddr)
927 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
928 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
929 ipv6_addr_any((struct in6_addr *)saddr) ||
930 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
935 static __inline__ int
936 xfrm_state_addr_check(struct xfrm_state *x,
937 xfrm_address_t *daddr, xfrm_address_t *saddr,
938 unsigned short family)
942 return __xfrm4_state_addr_check(x, daddr, saddr);
944 return __xfrm6_state_addr_check(x, daddr, saddr);
949 static __inline__ int
950 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
951 unsigned short family)
955 return __xfrm4_state_addr_check(x,
956 (xfrm_address_t *)&fl->fl4_dst,
957 (xfrm_address_t *)&fl->fl4_src);
959 return __xfrm6_state_addr_check(x,
960 (xfrm_address_t *)&fl->fl6_dst,
961 (xfrm_address_t *)&fl->fl6_src);
966 static inline int xfrm_state_kern(struct xfrm_state *x)
968 return atomic_read(&x->tunnel_users);
971 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
973 return (!userproto || proto == userproto ||
974 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
975 proto == IPPROTO_ESP ||
976 proto == IPPROTO_COMP)));
980 * xfrm algorithm information
982 struct xfrm_algo_auth_info {
987 struct xfrm_algo_encr_info {
992 struct xfrm_algo_comp_info {
996 struct xfrm_algo_desc {
1001 struct xfrm_algo_auth_info auth;
1002 struct xfrm_algo_encr_info encr;
1003 struct xfrm_algo_comp_info comp;
1005 struct sadb_alg desc;
1008 /* XFRM tunnel handlers. */
1009 struct xfrm_tunnel {
1010 int (*handler)(struct sk_buff *skb);
1011 int (*err_handler)(struct sk_buff *skb, __u32 info);
1013 struct xfrm_tunnel *next;
1017 struct xfrm6_tunnel {
1018 int (*handler)(struct sk_buff *skb);
1019 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1020 int type, int code, int offset, __be32 info);
1021 struct xfrm6_tunnel *next;
1025 extern void xfrm_init(void);
1026 extern void xfrm4_init(void);
1027 extern void xfrm6_init(void);
1028 extern void xfrm6_fini(void);
1029 extern void xfrm_state_init(void);
1030 extern void xfrm4_state_init(void);
1031 extern void xfrm6_state_init(void);
1032 extern void xfrm6_state_fini(void);
1034 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1035 extern struct xfrm_state *xfrm_state_alloc(void);
1036 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1037 struct flowi *fl, struct xfrm_tmpl *tmpl,
1038 struct xfrm_policy *pol, int *err,
1039 unsigned short family);
1040 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1041 xfrm_address_t *saddr,
1042 unsigned short family,
1043 u8 mode, u8 proto, u32 reqid);
1044 extern int xfrm_state_check_expire(struct xfrm_state *x);
1045 extern void xfrm_state_insert(struct xfrm_state *x);
1046 extern int xfrm_state_add(struct xfrm_state *x);
1047 extern int xfrm_state_update(struct xfrm_state *x);
1048 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1049 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1050 #ifdef CONFIG_XFRM_SUB_POLICY
1051 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1052 int n, unsigned short family);
1053 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1054 int n, unsigned short family);
1056 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1057 int n, unsigned short family)
1062 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1063 int n, unsigned short family)
1069 struct xfrmk_sadinfo {
1070 u32 sadhcnt; /* current hash bkts */
1071 u32 sadhmcnt; /* max allowed hash bkts */
1072 u32 sadcnt; /* current running count */
1075 struct xfrmk_spdinfo {
1086 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1087 extern int xfrm_state_delete(struct xfrm_state *x);
1088 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1089 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1090 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1091 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1092 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1093 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1094 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1095 extern int xfrm_init_state(struct xfrm_state *x);
1096 extern int xfrm_output(struct sk_buff *skb);
1097 extern int xfrm4_extract_header(struct sk_buff *skb);
1098 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1100 extern int xfrm4_rcv(struct sk_buff *skb);
1102 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1104 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1107 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1108 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1109 extern int xfrm4_output(struct sk_buff *skb);
1110 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1111 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1112 extern int xfrm6_extract_header(struct sk_buff *skb);
1113 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1114 extern int xfrm6_rcv(struct sk_buff *skb);
1115 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1116 xfrm_address_t *saddr, u8 proto);
1117 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1118 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1119 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1120 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1121 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1122 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1123 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1124 extern int xfrm6_output(struct sk_buff *skb);
1125 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1129 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1130 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1132 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1134 return -ENOPROTOOPT;
1137 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1139 /* should not happen */
1145 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1146 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1147 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1148 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1149 struct xfrm_selector *sel,
1150 struct xfrm_sec_ctx *ctx, int delete,
1152 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1153 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1154 u32 xfrm_get_acqseq(void);
1155 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1156 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1157 xfrm_address_t *daddr, xfrm_address_t *saddr,
1158 int create, unsigned short family);
1159 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1160 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1161 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1162 struct flowi *fl, int family, int strict);
1164 #ifdef CONFIG_XFRM_MIGRATE
1165 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1166 struct xfrm_migrate *m, int num_bundles);
1167 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1168 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1169 struct xfrm_migrate *m);
1170 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1171 struct xfrm_migrate *m, int num_bundles);
1174 extern wait_queue_head_t km_waitq;
1175 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1176 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1177 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1179 extern void xfrm_input_init(void);
1180 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1182 extern void xfrm_probe_algs(void);
1183 extern int xfrm_count_auth_supported(void);
1184 extern int xfrm_count_enc_supported(void);
1185 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1186 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1187 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1188 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1189 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1190 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1191 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1192 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1196 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1199 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1200 int offset, int len, icv_update_fn_t icv_update);
1202 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1208 return (__force __u32)a->a4 - (__force __u32)b->a4;
1210 return ipv6_addr_cmp((struct in6_addr *)a,
1211 (struct in6_addr *)b);
1215 static inline int xfrm_policy_id2dir(u32 index)
1220 static inline int xfrm_aevent_is_on(void)
1226 nlsk = rcu_dereference(xfrm_nl);
1228 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1233 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1235 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1238 #ifdef CONFIG_XFRM_MIGRATE
1239 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1241 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1244 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1247 for (i = 0; i < n; i++)
1248 xfrm_state_put(*(states + i));
1251 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1254 for (i = 0; i < n; i++)
1255 xfrm_state_delete(*(states + i));
1259 #endif /* _NET_XFRM_H */