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>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
57 extern struct mutex xfrm_cfg_mutex;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 /* Note: bydst is re-used during gc */
124 struct list_head all;
125 struct hlist_node bydst;
126 struct hlist_node bysrc;
127 struct hlist_node byspi;
133 struct xfrm_selector sel;
137 /* Key manger bits */
144 /* Parameters of this state. */
149 u8 aalgo, ealgo, calgo;
152 xfrm_address_t saddr;
157 struct xfrm_lifetime_cfg lft;
159 /* Data for transformer */
160 struct xfrm_algo *aalg;
161 struct xfrm_algo *ealg;
162 struct xfrm_algo *calg;
163 struct xfrm_algo_aead *aead;
165 /* Data for encapsulator */
166 struct xfrm_encap_tmpl *encap;
168 /* Data for care-of address */
169 xfrm_address_t *coaddr;
171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
172 struct xfrm_state *tunnel;
174 /* If a tunnel, number of users + 1 */
175 atomic_t tunnel_users;
177 /* State for replay detection */
178 struct xfrm_replay_state replay;
180 /* Replay detection state at the time we sent the last notification */
181 struct xfrm_replay_state preplay;
183 /* internal flag that only holds state for delayed aevent at the
188 /* Replay detection notification settings */
192 /* Replay detection notification timer */
193 struct timer_list rtimer;
196 struct xfrm_stats stats;
198 struct xfrm_lifetime_cur curlft;
199 struct timer_list timer;
202 unsigned long lastused;
204 /* Reference to data common to all the instances of this
206 const struct xfrm_type *type;
207 struct xfrm_mode *inner_mode;
208 struct xfrm_mode *inner_mode_iaf;
209 struct xfrm_mode *outer_mode;
211 /* Security context */
212 struct xfrm_sec_ctx *security;
214 /* Private data of this transformer, format is opaque,
215 * interpreted by xfrm_type methods. */
219 /* xflags - make enum if more show up */
220 #define XFRM_TIME_DEFER 1
231 /* callback structure passed from either netlink or pfkey */
250 struct xfrm_policy_afinfo {
251 unsigned short family;
252 struct dst_ops *dst_ops;
253 void (*garbage_collect)(void);
254 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
255 xfrm_address_t *daddr);
256 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
257 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
258 void (*decode_session)(struct sk_buff *skb,
261 int (*get_tos)(struct flowi *fl);
262 int (*init_path)(struct xfrm_dst *path,
263 struct dst_entry *dst,
265 int (*fill_dst)(struct xfrm_dst *xdst,
266 struct net_device *dev);
269 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
270 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
271 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
272 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
275 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
276 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
277 extern int __xfrm_state_delete(struct xfrm_state *x);
279 struct xfrm_state_afinfo {
283 struct module *owner;
284 const struct xfrm_type *type_map[IPPROTO_MAX];
285 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
286 int (*init_flags)(struct xfrm_state *x);
287 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
288 struct xfrm_tmpl *tmpl,
289 xfrm_address_t *daddr, xfrm_address_t *saddr);
290 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
291 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
292 int (*output)(struct sk_buff *skb);
293 int (*extract_input)(struct xfrm_state *x,
294 struct sk_buff *skb);
295 int (*extract_output)(struct xfrm_state *x,
296 struct sk_buff *skb);
297 int (*transport_finish)(struct sk_buff *skb,
301 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
302 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
304 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
309 struct module *owner;
312 #define XFRM_TYPE_NON_FRAGMENT 1
313 #define XFRM_TYPE_REPLAY_PROT 2
314 #define XFRM_TYPE_LOCAL_COADDR 4
315 #define XFRM_TYPE_REMOTE_COADDR 8
317 int (*init_state)(struct xfrm_state *x);
318 void (*destructor)(struct xfrm_state *);
319 int (*input)(struct xfrm_state *, struct sk_buff *skb);
320 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
321 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
322 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
323 /* Estimate maximal size of result of transformation of a dgram */
324 u32 (*get_mtu)(struct xfrm_state *, int size);
327 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
328 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
332 * Remove encapsulation header.
334 * The IP header will be moved over the top of the encapsulation
337 * On entry, the transport header shall point to where the IP header
338 * should be and the network header shall be set to where the IP
339 * header currently is. skb->data shall point to the start of the
342 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
345 * This is the actual input entry point.
347 * For transport mode and equivalent this would be identical to
348 * input2 (which does not need to be set). While tunnel mode
349 * and equivalent would set this to the tunnel encapsulation function
350 * xfrm4_prepare_input that would in turn call input2.
352 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
355 * Add encapsulation header.
357 * On exit, the transport header will be set to the start of the
358 * encapsulation header to be filled in by x->type->output and
359 * the mac header will be set to the nextheader (protocol for
360 * IPv4) field of the extension header directly preceding the
361 * encapsulation header, or in its absence, that of the top IP
362 * header. The value of the network header will always point
363 * to the top IP header while skb->data will point to the payload.
365 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
368 * This is the actual output entry point.
370 * For transport mode and equivalent this would be identical to
371 * output2 (which does not need to be set). While tunnel mode
372 * and equivalent would set this to a tunnel encapsulation function
373 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
376 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
378 struct xfrm_state_afinfo *afinfo;
379 struct module *owner;
384 /* Flags for xfrm_mode. */
386 XFRM_MODE_FLAG_TUNNEL = 1,
389 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
390 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
392 static inline int xfrm_af2proto(unsigned int family)
404 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
406 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
407 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
408 return x->inner_mode;
410 return x->inner_mode_iaf;
415 /* id in template is interpreted as:
416 * daddr - destination of tunnel, may be zero for transport mode.
417 * spi - zero to acquire spi. Not zero if spi is static, then
418 * daddr must be fixed too.
419 * proto - AH/ESP/IPCOMP
423 /* Source address of tunnel. Ignored, if it is not a tunnel. */
424 xfrm_address_t saddr;
426 unsigned short encap_family;
430 /* Mode: transport, tunnel etc. */
433 /* Sharing mode: unique, this session only, this user only etc. */
436 /* May skip this transfomration if no SA is found */
439 /* Skip aalgos/ealgos/calgos checks. */
442 /* Bit mask of algos allowed for acquisition */
448 #define XFRM_MAX_DEPTH 6
452 struct xfrm_policy *next;
453 struct list_head bytype;
454 struct hlist_node bydst;
455 struct hlist_node byidx;
457 /* This lock only affects elements except for entry. */
460 struct timer_list timer;
464 struct xfrm_selector selector;
465 struct xfrm_lifetime_cfg lft;
466 struct xfrm_lifetime_cur curlft;
467 struct dst_entry *bundles;
474 /* XXX 1 byte hole, try to pack */
475 struct xfrm_sec_ctx *security;
476 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
479 struct xfrm_migrate {
480 xfrm_address_t old_daddr;
481 xfrm_address_t old_saddr;
482 xfrm_address_t new_daddr;
483 xfrm_address_t new_saddr;
492 #define XFRM_KM_TIMEOUT 30
494 #define XFRM_REPLAY_SEQ 1
495 #define XFRM_REPLAY_OSEQ 2
496 #define XFRM_REPLAY_SEQ_MASK 3
498 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
499 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
501 /* default aevent timeout in units of 100ms */
502 #define XFRM_AE_ETIME 10
503 /* Async Event timer multiplier */
504 #define XFRM_AE_ETH_M 10
505 /* default seq threshold size */
506 #define XFRM_AE_SEQT_SIZE 2
510 struct list_head list;
512 int (*notify)(struct xfrm_state *x, struct km_event *c);
513 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
514 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
515 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
516 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
517 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
518 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
521 extern int xfrm_register_km(struct xfrm_mgr *km);
522 extern int xfrm_unregister_km(struct xfrm_mgr *km);
524 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
527 * This structure is used for the duration where packets are being
528 * transformed by IPsec. As soon as the packet leaves IPsec the
529 * area beyond the generic IP part may be overwritten.
533 struct inet_skb_parm h4;
534 struct inet6_skb_parm h6;
537 /* Sequence number for replay protection. */
544 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
547 * This structure is used by the afinfo prepare_input/prepare_output functions
548 * to transmit header information to the mode input/output functions.
550 struct xfrm_mode_skb_cb {
552 struct inet_skb_parm h4;
553 struct inet6_skb_parm h6;
556 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
560 /* IP header length (excluding options or extension headers). */
563 /* TOS for IPv4, class for IPv6. */
566 /* TTL for IPv4, hop limitfor IPv6. */
569 /* Protocol for IPv4, NH for IPv6. */
572 /* Option length for IPv4, zero for IPv6. */
575 /* Used by IPv6 only, zero for IPv4. */
579 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
582 * This structure is used by the input processing to locate the SPI and
583 * related information.
585 struct xfrm_spi_skb_cb {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
591 unsigned int daddroff;
595 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
597 /* Audit Information */
605 #ifdef CONFIG_AUDITSYSCALL
606 static inline struct audit_buffer *xfrm_audit_start(const char *op)
608 struct audit_buffer *audit_buf = NULL;
610 if (audit_enabled == 0)
612 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
613 AUDIT_MAC_IPSEC_EVENT);
614 if (audit_buf == NULL)
616 audit_log_format(audit_buf, "op=%s", op);
620 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
621 struct audit_buffer *audit_buf)
626 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
628 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
629 audit_log_format(audit_buf, " subj=%s", secctx);
630 security_release_secctx(secctx, secctx_len);
632 audit_log_task_context(audit_buf);
635 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
636 u32 auid, u32 ses, u32 secid);
637 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
638 u32 auid, u32 ses, u32 secid);
639 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
640 u32 auid, u32 ses, u32 secid);
641 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
642 u32 auid, u32 ses, u32 secid);
643 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
644 struct sk_buff *skb);
645 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
646 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
647 __be32 net_spi, __be32 net_seq);
648 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
649 struct sk_buff *skb, u8 proto);
652 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
653 u32 auid, u32 ses, u32 secid)
657 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
658 u32 auid, u32 ses, u32 secid)
662 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
663 u32 auid, u32 ses, u32 secid)
667 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
668 u32 auid, u32 ses, u32 secid)
672 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
677 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
682 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
683 __be32 net_spi, __be32 net_seq)
687 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
688 struct sk_buff *skb, u8 proto)
691 #endif /* CONFIG_AUDITSYSCALL */
693 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
695 if (likely(policy != NULL))
696 atomic_inc(&policy->refcnt);
699 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
701 static inline void xfrm_pol_put(struct xfrm_policy *policy)
703 if (atomic_dec_and_test(&policy->refcnt))
704 xfrm_policy_destroy(policy);
707 #ifdef CONFIG_XFRM_SUB_POLICY
708 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
711 for (i = npols - 1; i >= 0; --i)
712 xfrm_pol_put(pols[i]);
715 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
717 xfrm_pol_put(pols[0]);
721 extern void __xfrm_state_destroy(struct xfrm_state *);
723 static inline void __xfrm_state_put(struct xfrm_state *x)
725 atomic_dec(&x->refcnt);
728 static inline void xfrm_state_put(struct xfrm_state *x)
730 if (atomic_dec_and_test(&x->refcnt))
731 __xfrm_state_destroy(x);
734 static inline void xfrm_state_hold(struct xfrm_state *x)
736 atomic_inc(&x->refcnt);
739 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
746 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
747 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
750 if (memcmp(a1, a2, pdw << 2))
756 mask = htonl((0xffffffff) << (32 - pbi));
758 if ((a1[pdw] ^ a2[pdw]) & mask)
766 __be16 xfrm_flowi_sport(struct flowi *fl)
772 case IPPROTO_UDPLITE:
774 port = fl->fl_ip_sport;
778 port = htons(fl->fl_icmp_type);
781 port = htons(fl->fl_mh_type);
790 __be16 xfrm_flowi_dport(struct flowi *fl)
796 case IPPROTO_UDPLITE:
798 port = fl->fl_ip_dport;
802 port = htons(fl->fl_icmp_code);
810 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
811 unsigned short family);
813 #ifdef CONFIG_SECURITY_NETWORK_XFRM
814 /* If neither has a context --> match
815 * Otherwise, both must have a context and the sids, doi, alg must match
817 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
819 return ((!s1 && !s2) ||
821 (s1->ctx_sid == s2->ctx_sid) &&
822 (s1->ctx_doi == s2->ctx_doi) &&
823 (s1->ctx_alg == s2->ctx_alg)));
826 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
832 /* A struct encoding bundle of transformations to apply to some set of flow.
834 * dst->child points to the next element of bundle.
835 * dst->xfrm points to an instanse of transformer.
837 * Due to unfortunate limitations of current routing cache, which we
838 * have no time to fix, it mirrors struct rtable and bound to the same
839 * routing key, including saddr,daddr. However, we can have many of
840 * bundles differing by session id. All the bundles grow from a parent
846 struct dst_entry dst;
850 struct dst_entry *route;
851 #ifdef CONFIG_XFRM_SUB_POLICY
852 struct flowi *origin;
853 struct xfrm_selector *partner;
856 u32 route_mtu_cached;
857 u32 child_mtu_cached;
862 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
864 dst_release(xdst->route);
865 if (likely(xdst->u.dst.xfrm))
866 xfrm_state_put(xdst->u.dst.xfrm);
867 #ifdef CONFIG_XFRM_SUB_POLICY
870 kfree(xdst->partner);
871 xdst->partner = NULL;
875 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
881 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
884 static inline struct sec_path *
885 secpath_get(struct sec_path *sp)
888 atomic_inc(&sp->refcnt);
892 extern void __secpath_destroy(struct sec_path *sp);
895 secpath_put(struct sec_path *sp)
897 if (sp && atomic_dec_and_test(&sp->refcnt))
898 __secpath_destroy(sp);
901 extern struct sec_path *secpath_dup(struct sec_path *src);
904 secpath_reset(struct sk_buff *skb)
907 secpath_put(skb->sp);
913 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
917 return addr->a4 == 0;
919 return ipv6_addr_any((struct in6_addr *)&addr->a6);
925 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
927 return (tmpl->saddr.a4 &&
928 tmpl->saddr.a4 != x->props.saddr.a4);
932 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
934 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
935 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
939 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
943 return __xfrm4_state_addr_cmp(tmpl, x);
945 return __xfrm6_state_addr_cmp(tmpl, x);
951 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
953 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
955 unsigned int family, int reverse)
957 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
959 if (sk && sk->sk_policy[XFRM_POLICY_IN])
960 return __xfrm_policy_check(sk, ndir, skb, family);
962 return (!xfrm_policy_count[dir] && !skb->sp) ||
963 (skb->dst->flags & DST_NOPOLICY) ||
964 __xfrm_policy_check(sk, ndir, skb, family);
967 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
969 return __xfrm_policy_check2(sk, dir, skb, family, 0);
972 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
974 return xfrm_policy_check(sk, dir, skb, AF_INET);
977 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
979 return xfrm_policy_check(sk, dir, skb, AF_INET6);
982 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
985 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
988 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
991 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
994 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
995 unsigned int family, int reverse);
997 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1000 return __xfrm_decode_session(skb, fl, family, 0);
1003 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1005 unsigned int family)
1007 return __xfrm_decode_session(skb, fl, family, 1);
1010 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1012 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1014 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1015 (skb->dst->flags & DST_NOXFRM) ||
1016 __xfrm_route_forward(skb, family);
1019 static inline int xfrm4_route_forward(struct sk_buff *skb)
1021 return xfrm_route_forward(skb, AF_INET);
1024 static inline int xfrm6_route_forward(struct sk_buff *skb)
1026 return xfrm_route_forward(skb, AF_INET6);
1029 extern int __xfrm_sk_clone_policy(struct sock *sk);
1031 static inline int xfrm_sk_clone_policy(struct sock *sk)
1033 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1034 return __xfrm_sk_clone_policy(sk);
1038 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1040 static inline void xfrm_sk_free_policy(struct sock *sk)
1042 if (unlikely(sk->sk_policy[0] != NULL)) {
1043 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1044 sk->sk_policy[0] = NULL;
1046 if (unlikely(sk->sk_policy[1] != NULL)) {
1047 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1048 sk->sk_policy[1] = NULL;
1054 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1055 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1056 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1057 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1058 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1062 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1066 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1070 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1072 unsigned int family)
1076 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1077 struct sk_buff *skb)
1081 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1082 struct sk_buff *skb)
1089 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1093 return (xfrm_address_t *)&fl->fl4_dst;
1095 return (xfrm_address_t *)&fl->fl6_dst;
1101 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1105 return (xfrm_address_t *)&fl->fl4_src;
1107 return (xfrm_address_t *)&fl->fl6_src;
1113 void xfrm_flowi_addr_get(struct flowi *fl,
1114 xfrm_address_t *saddr, xfrm_address_t *daddr,
1115 unsigned short family)
1119 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1120 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1123 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1124 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1129 static __inline__ int
1130 __xfrm4_state_addr_check(struct xfrm_state *x,
1131 xfrm_address_t *daddr, xfrm_address_t *saddr)
1133 if (daddr->a4 == x->id.daddr.a4 &&
1134 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1139 static __inline__ int
1140 __xfrm6_state_addr_check(struct xfrm_state *x,
1141 xfrm_address_t *daddr, xfrm_address_t *saddr)
1143 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1144 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1145 ipv6_addr_any((struct in6_addr *)saddr) ||
1146 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1151 static __inline__ int
1152 xfrm_state_addr_check(struct xfrm_state *x,
1153 xfrm_address_t *daddr, xfrm_address_t *saddr,
1154 unsigned short family)
1158 return __xfrm4_state_addr_check(x, daddr, saddr);
1160 return __xfrm6_state_addr_check(x, daddr, saddr);
1165 static __inline__ int
1166 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1167 unsigned short family)
1171 return __xfrm4_state_addr_check(x,
1172 (xfrm_address_t *)&fl->fl4_dst,
1173 (xfrm_address_t *)&fl->fl4_src);
1175 return __xfrm6_state_addr_check(x,
1176 (xfrm_address_t *)&fl->fl6_dst,
1177 (xfrm_address_t *)&fl->fl6_src);
1182 static inline int xfrm_state_kern(struct xfrm_state *x)
1184 return atomic_read(&x->tunnel_users);
1187 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1189 return (!userproto || proto == userproto ||
1190 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1191 proto == IPPROTO_ESP ||
1192 proto == IPPROTO_COMP)));
1196 * xfrm algorithm information
1198 struct xfrm_algo_aead_info {
1202 struct xfrm_algo_auth_info {
1207 struct xfrm_algo_encr_info {
1212 struct xfrm_algo_comp_info {
1216 struct xfrm_algo_desc {
1221 struct xfrm_algo_aead_info aead;
1222 struct xfrm_algo_auth_info auth;
1223 struct xfrm_algo_encr_info encr;
1224 struct xfrm_algo_comp_info comp;
1226 struct sadb_alg desc;
1229 /* XFRM tunnel handlers. */
1230 struct xfrm_tunnel {
1231 int (*handler)(struct sk_buff *skb);
1232 int (*err_handler)(struct sk_buff *skb, __u32 info);
1234 struct xfrm_tunnel *next;
1238 struct xfrm6_tunnel {
1239 int (*handler)(struct sk_buff *skb);
1240 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1241 int type, int code, int offset, __be32 info);
1242 struct xfrm6_tunnel *next;
1246 struct xfrm_state_walk {
1247 struct xfrm_state *state;
1252 struct xfrm_policy_walk {
1253 struct xfrm_policy *policy;
1258 extern void xfrm_init(void);
1259 extern void xfrm4_init(void);
1260 extern void xfrm_state_init(void);
1261 extern void xfrm4_state_init(void);
1263 extern int xfrm6_init(void);
1264 extern void xfrm6_fini(void);
1265 extern int xfrm6_state_init(void);
1266 extern void xfrm6_state_fini(void);
1268 static inline int xfrm6_init(void)
1272 static inline void xfrm6_fini(void)
1278 #ifdef CONFIG_XFRM_STATISTICS
1279 extern int xfrm_proc_init(void);
1282 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1284 walk->proto = proto;
1289 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1291 if (walk->state != NULL) {
1292 xfrm_state_put(walk->state);
1297 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1298 int (*func)(struct xfrm_state *, int, void*), void *);
1299 extern struct xfrm_state *xfrm_state_alloc(void);
1300 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1301 struct flowi *fl, struct xfrm_tmpl *tmpl,
1302 struct xfrm_policy *pol, int *err,
1303 unsigned short family);
1304 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1305 xfrm_address_t *saddr,
1306 unsigned short family,
1307 u8 mode, u8 proto, u32 reqid);
1308 extern int xfrm_state_check_expire(struct xfrm_state *x);
1309 extern void xfrm_state_insert(struct xfrm_state *x);
1310 extern int xfrm_state_add(struct xfrm_state *x);
1311 extern int xfrm_state_update(struct xfrm_state *x);
1312 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1313 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1314 #ifdef CONFIG_XFRM_SUB_POLICY
1315 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316 int n, unsigned short family);
1317 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318 int n, unsigned short family);
1320 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1321 int n, unsigned short family)
1326 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1327 int n, unsigned short family)
1333 struct xfrmk_sadinfo {
1334 u32 sadhcnt; /* current hash bkts */
1335 u32 sadhmcnt; /* max allowed hash bkts */
1336 u32 sadcnt; /* current running count */
1339 struct xfrmk_spdinfo {
1350 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1351 extern int xfrm_state_delete(struct xfrm_state *x);
1352 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1353 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1354 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1355 extern int xfrm_replay_check(struct xfrm_state *x,
1356 struct sk_buff *skb, __be32 seq);
1357 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1358 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1359 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1360 extern int xfrm_init_state(struct xfrm_state *x);
1361 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1362 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1364 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1365 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1366 extern int xfrm_output(struct sk_buff *skb);
1367 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_extract_header(struct sk_buff *skb);
1369 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1370 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1372 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1373 extern int xfrm4_rcv(struct sk_buff *skb);
1375 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1377 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1380 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1382 extern int xfrm4_output(struct sk_buff *skb);
1383 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1384 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1385 extern int xfrm6_extract_header(struct sk_buff *skb);
1386 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1388 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1389 extern int xfrm6_rcv(struct sk_buff *skb);
1390 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1391 xfrm_address_t *saddr, u8 proto);
1392 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1393 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1394 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1395 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1396 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1397 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm6_output(struct sk_buff *skb);
1400 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1404 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1405 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1407 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1409 return -ENOPROTOOPT;
1412 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1414 /* should not happen */
1420 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1422 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1424 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1426 walk->policy = NULL;
1430 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1432 if (walk->policy != NULL) {
1433 xfrm_pol_put(walk->policy);
1434 walk->policy = NULL;
1438 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1439 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1440 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1441 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1442 struct xfrm_selector *sel,
1443 struct xfrm_sec_ctx *ctx, int delete,
1445 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1446 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1447 u32 xfrm_get_acqseq(void);
1448 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1449 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1450 xfrm_address_t *daddr, xfrm_address_t *saddr,
1451 int create, unsigned short family);
1452 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1453 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1454 struct flowi *fl, int family, int strict);
1456 #ifdef CONFIG_XFRM_MIGRATE
1457 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles);
1459 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1460 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1461 struct xfrm_migrate *m);
1462 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1463 struct xfrm_migrate *m, int num_bundles);
1466 extern wait_queue_head_t km_waitq;
1467 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1468 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1469 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1471 extern void xfrm_input_init(void);
1472 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1474 extern void xfrm_probe_algs(void);
1475 extern int xfrm_count_auth_supported(void);
1476 extern int xfrm_count_enc_supported(void);
1477 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1478 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1479 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1480 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1481 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1482 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1483 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1484 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1485 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1490 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1493 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1494 int offset, int len, icv_update_fn_t icv_update);
1496 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1502 return (__force __u32)a->a4 - (__force __u32)b->a4;
1504 return ipv6_addr_cmp((struct in6_addr *)a,
1505 (struct in6_addr *)b);
1509 static inline int xfrm_policy_id2dir(u32 index)
1514 static inline int xfrm_aevent_is_on(void)
1520 nlsk = rcu_dereference(xfrm_nl);
1522 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1527 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1529 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1532 #ifdef CONFIG_XFRM_MIGRATE
1533 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1535 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1538 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1541 for (i = 0; i < n; i++)
1542 xfrm_state_put(*(states + i));
1545 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1548 for (i = 0; i < n; i++)
1549 xfrm_state_delete(*(states + i));
1553 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1555 return skb->sp->xvec[skb->sp->len - 1];
1558 #endif /* _NET_XFRM_H */