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 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
42 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
43 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
45 #define XFRM_INC_STATS(net, field) ((void)(net))
46 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
47 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
50 extern struct mutex xfrm_cfg_mutex;
52 /* Organization of SPD aka "XFRM rules"
53 ------------------------------------
56 - policy rule, struct xfrm_policy (=SPD entry)
57 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
58 - instance of a transformer, struct xfrm_state (=SA)
59 - template to clone xfrm_state, struct xfrm_tmpl
61 SPD is plain linear list of xfrm_policy rules, ordered by priority.
62 (To be compatible with existing pfkeyv2 implementations,
63 many rules with priority of 0x7fffffff are allowed to exist and
64 such rules are ordered in an unpredictable way, thanks to bsd folks.)
66 Lookup is plain linear search until the first match with selector.
68 If "action" is "block", then we prohibit the flow, otherwise:
69 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
70 policy entry has list of up to XFRM_MAX_DEPTH transformations,
71 described by templates xfrm_tmpl. Each template is resolved
72 to a complete xfrm_state (see below) and we pack bundle of transformations
73 to a dst_entry returned to requestor.
75 dst -. xfrm .-> xfrm_state #1
76 |---. child .-> dst -. xfrm .-> xfrm_state #2
77 |---. child .-> dst -. xfrm .-> xfrm_state #3
80 Bundles are cached at xrfm_policy struct (field ->bundles).
83 Resolution of xrfm_tmpl
84 -----------------------
86 1. ->mode Mode: transport or tunnel
87 2. ->id.proto Protocol: AH/ESP/IPCOMP
88 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
89 Q: allow to resolve security gateway?
90 4. ->id.spi If not zero, static SPI.
91 5. ->saddr Local tunnel endpoint, ignored for transport mode.
92 6. ->algos List of allowed algos. Plain bitmask now.
93 Q: ealgos, aalgos, calgos. What a mess...
94 7. ->share Sharing mode.
95 Q: how to implement private sharing mode? To add struct sock* to
98 Having this template we search through SAD searching for entries
99 with appropriate mode/proto/algo, permitted by selector.
100 If no appropriate entry found, it is requested from key manager.
103 Q: How to find all the bundles referring to a physical path for
104 PMTU discovery? Seems, dst should contain list of all parents...
105 and enter to infinite locking hierarchy disaster.
106 No! It is easier, we will not search for them, let them find us.
107 We add genid to each dst plus pointer to genid of raw IP route,
108 pmtu disc will update pmtu on raw IP route and increase its genid.
109 dst_check() will see this for top level and trigger resyncing
110 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
113 struct xfrm_state_walk {
114 struct list_head all;
123 /* Full description of state of transformer. */
130 struct hlist_node gclist;
131 struct hlist_node bydst;
133 struct hlist_node bysrc;
134 struct hlist_node byspi;
140 struct xfrm_selector sel;
144 /* Key manager bits */
145 struct xfrm_state_walk km;
147 /* Parameters of this state. */
152 u8 aalgo, ealgo, calgo;
155 xfrm_address_t saddr;
160 struct xfrm_lifetime_cfg lft;
162 /* Data for transformer */
163 struct xfrm_algo *aalg;
164 struct xfrm_algo *ealg;
165 struct xfrm_algo *calg;
166 struct xfrm_algo_aead *aead;
168 /* Data for encapsulator */
169 struct xfrm_encap_tmpl *encap;
171 /* Data for care-of address */
172 xfrm_address_t *coaddr;
174 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
175 struct xfrm_state *tunnel;
177 /* If a tunnel, number of users + 1 */
178 atomic_t tunnel_users;
180 /* State for replay detection */
181 struct xfrm_replay_state replay;
183 /* Replay detection state at the time we sent the last notification */
184 struct xfrm_replay_state preplay;
186 /* internal flag that only holds state for delayed aevent at the
191 /* Replay detection notification settings */
195 /* Replay detection notification timer */
196 struct timer_list rtimer;
199 struct xfrm_stats stats;
201 struct xfrm_lifetime_cur curlft;
202 struct timer_list timer;
205 unsigned long lastused;
207 /* Reference to data common to all the instances of this
209 const struct xfrm_type *type;
210 struct xfrm_mode *inner_mode;
211 struct xfrm_mode *inner_mode_iaf;
212 struct xfrm_mode *outer_mode;
214 /* Security context */
215 struct xfrm_sec_ctx *security;
217 /* Private data of this transformer, format is opaque,
218 * interpreted by xfrm_type methods. */
222 static inline struct net *xs_net(struct xfrm_state *x)
224 return read_pnet(&x->xs_net);
227 /* xflags - make enum if more show up */
228 #define XFRM_TIME_DEFER 1
239 /* callback structure passed from either netlink or pfkey */
259 struct xfrm_policy_afinfo {
260 unsigned short family;
261 struct dst_ops *dst_ops;
262 void (*garbage_collect)(struct net *net);
263 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
264 xfrm_address_t *saddr,
265 xfrm_address_t *daddr);
266 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
267 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
268 void (*decode_session)(struct sk_buff *skb,
271 int (*get_tos)(struct flowi *fl);
272 int (*init_path)(struct xfrm_dst *path,
273 struct dst_entry *dst,
275 int (*fill_dst)(struct xfrm_dst *xdst,
276 struct net_device *dev);
279 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
280 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
281 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
282 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
285 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
286 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
287 extern int __xfrm_state_delete(struct xfrm_state *x);
289 struct xfrm_state_afinfo {
293 struct module *owner;
294 const struct xfrm_type *type_map[IPPROTO_MAX];
295 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
296 int (*init_flags)(struct xfrm_state *x);
297 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
298 struct xfrm_tmpl *tmpl,
299 xfrm_address_t *daddr, xfrm_address_t *saddr);
300 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
301 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
302 int (*output)(struct sk_buff *skb);
303 int (*extract_input)(struct xfrm_state *x,
304 struct sk_buff *skb);
305 int (*extract_output)(struct xfrm_state *x,
306 struct sk_buff *skb);
307 int (*transport_finish)(struct sk_buff *skb,
311 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
312 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
314 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
319 struct module *owner;
322 #define XFRM_TYPE_NON_FRAGMENT 1
323 #define XFRM_TYPE_REPLAY_PROT 2
324 #define XFRM_TYPE_LOCAL_COADDR 4
325 #define XFRM_TYPE_REMOTE_COADDR 8
327 int (*init_state)(struct xfrm_state *x);
328 void (*destructor)(struct xfrm_state *);
329 int (*input)(struct xfrm_state *, struct sk_buff *skb);
330 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
331 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
332 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
333 /* Estimate maximal size of result of transformation of a dgram */
334 u32 (*get_mtu)(struct xfrm_state *, int size);
337 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
338 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
342 * Remove encapsulation header.
344 * The IP header will be moved over the top of the encapsulation
347 * On entry, the transport header shall point to where the IP header
348 * should be and the network header shall be set to where the IP
349 * header currently is. skb->data shall point to the start of the
352 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
355 * This is the actual input entry point.
357 * For transport mode and equivalent this would be identical to
358 * input2 (which does not need to be set). While tunnel mode
359 * and equivalent would set this to the tunnel encapsulation function
360 * xfrm4_prepare_input that would in turn call input2.
362 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
365 * Add encapsulation header.
367 * On exit, the transport header will be set to the start of the
368 * encapsulation header to be filled in by x->type->output and
369 * the mac header will be set to the nextheader (protocol for
370 * IPv4) field of the extension header directly preceding the
371 * encapsulation header, or in its absence, that of the top IP
372 * header. The value of the network header will always point
373 * to the top IP header while skb->data will point to the payload.
375 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
378 * This is the actual output entry point.
380 * For transport mode and equivalent this would be identical to
381 * output2 (which does not need to be set). While tunnel mode
382 * and equivalent would set this to a tunnel encapsulation function
383 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
386 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
388 struct xfrm_state_afinfo *afinfo;
389 struct module *owner;
394 /* Flags for xfrm_mode. */
396 XFRM_MODE_FLAG_TUNNEL = 1,
399 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
400 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
402 static inline int xfrm_af2proto(unsigned int family)
414 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
416 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
417 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
418 return x->inner_mode;
420 return x->inner_mode_iaf;
425 /* id in template is interpreted as:
426 * daddr - destination of tunnel, may be zero for transport mode.
427 * spi - zero to acquire spi. Not zero if spi is static, then
428 * daddr must be fixed too.
429 * proto - AH/ESP/IPCOMP
433 /* Source address of tunnel. Ignored, if it is not a tunnel. */
434 xfrm_address_t saddr;
436 unsigned short encap_family;
440 /* Mode: transport, tunnel etc. */
443 /* Sharing mode: unique, this session only, this user only etc. */
446 /* May skip this transfomration if no SA is found */
449 /* Skip aalgos/ealgos/calgos checks. */
452 /* Bit mask of algos allowed for acquisition */
458 #define XFRM_MAX_DEPTH 6
460 struct xfrm_policy_walk_entry {
461 struct list_head all;
465 struct xfrm_policy_walk {
466 struct xfrm_policy_walk_entry walk;
476 struct hlist_node bydst;
477 struct hlist_node byidx;
479 /* This lock only affects elements except for entry. */
482 struct timer_list timer;
486 struct xfrm_selector selector;
487 struct xfrm_lifetime_cfg lft;
488 struct xfrm_lifetime_cur curlft;
489 struct dst_entry *bundles;
490 struct xfrm_policy_walk_entry walk;
496 struct xfrm_sec_ctx *security;
497 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
500 static inline struct net *xp_net(struct xfrm_policy *xp)
502 return read_pnet(&xp->xp_net);
505 struct xfrm_kmaddress {
506 xfrm_address_t local;
507 xfrm_address_t remote;
512 struct xfrm_migrate {
513 xfrm_address_t old_daddr;
514 xfrm_address_t old_saddr;
515 xfrm_address_t new_daddr;
516 xfrm_address_t new_saddr;
525 #define XFRM_KM_TIMEOUT 30
527 #define XFRM_REPLAY_SEQ 1
528 #define XFRM_REPLAY_OSEQ 2
529 #define XFRM_REPLAY_SEQ_MASK 3
531 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
532 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
534 /* default aevent timeout in units of 100ms */
535 #define XFRM_AE_ETIME 10
536 /* Async Event timer multiplier */
537 #define XFRM_AE_ETH_M 10
538 /* default seq threshold size */
539 #define XFRM_AE_SEQT_SIZE 2
543 struct list_head list;
545 int (*notify)(struct xfrm_state *x, struct km_event *c);
546 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
547 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
548 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
549 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
550 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
551 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
554 extern int xfrm_register_km(struct xfrm_mgr *km);
555 extern int xfrm_unregister_km(struct xfrm_mgr *km);
558 * This structure is used for the duration where packets are being
559 * transformed by IPsec. As soon as the packet leaves IPsec the
560 * area beyond the generic IP part may be overwritten.
564 struct inet_skb_parm h4;
565 struct inet6_skb_parm h6;
568 /* Sequence number for replay protection. */
575 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
578 * This structure is used by the afinfo prepare_input/prepare_output functions
579 * to transmit header information to the mode input/output functions.
581 struct xfrm_mode_skb_cb {
583 struct inet_skb_parm h4;
584 struct inet6_skb_parm h6;
587 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
591 /* IP header length (excluding options or extension headers). */
594 /* TOS for IPv4, class for IPv6. */
597 /* TTL for IPv4, hop limitfor IPv6. */
600 /* Protocol for IPv4, NH for IPv6. */
603 /* Option length for IPv4, zero for IPv6. */
606 /* Used by IPv6 only, zero for IPv4. */
610 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
613 * This structure is used by the input processing to locate the SPI and
614 * related information.
616 struct xfrm_spi_skb_cb {
618 struct inet_skb_parm h4;
619 struct inet6_skb_parm h6;
622 unsigned int daddroff;
626 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
628 /* Audit Information */
636 #ifdef CONFIG_AUDITSYSCALL
637 static inline struct audit_buffer *xfrm_audit_start(const char *op)
639 struct audit_buffer *audit_buf = NULL;
641 if (audit_enabled == 0)
643 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
644 AUDIT_MAC_IPSEC_EVENT);
645 if (audit_buf == NULL)
647 audit_log_format(audit_buf, "op=%s", op);
651 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
652 struct audit_buffer *audit_buf)
657 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
659 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
660 audit_log_format(audit_buf, " subj=%s", secctx);
661 security_release_secctx(secctx, secctx_len);
663 audit_log_task_context(audit_buf);
666 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
667 u32 auid, u32 ses, u32 secid);
668 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
669 u32 auid, u32 ses, u32 secid);
670 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
671 u32 auid, u32 ses, u32 secid);
672 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
673 u32 auid, u32 ses, u32 secid);
674 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
675 struct sk_buff *skb);
676 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
677 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
678 __be32 net_spi, __be32 net_seq);
679 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
680 struct sk_buff *skb, u8 proto);
683 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
684 u32 auid, u32 ses, u32 secid)
688 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
689 u32 auid, u32 ses, u32 secid)
693 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
694 u32 auid, u32 ses, u32 secid)
698 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
699 u32 auid, u32 ses, u32 secid)
703 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
713 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
714 __be32 net_spi, __be32 net_seq)
718 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
719 struct sk_buff *skb, u8 proto)
722 #endif /* CONFIG_AUDITSYSCALL */
724 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
726 if (likely(policy != NULL))
727 atomic_inc(&policy->refcnt);
730 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
732 static inline void xfrm_pol_put(struct xfrm_policy *policy)
734 if (atomic_dec_and_test(&policy->refcnt))
735 xfrm_policy_destroy(policy);
738 #ifdef CONFIG_XFRM_SUB_POLICY
739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
742 for (i = npols - 1; i >= 0; --i)
743 xfrm_pol_put(pols[i]);
746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
748 xfrm_pol_put(pols[0]);
752 extern void __xfrm_state_destroy(struct xfrm_state *);
754 static inline void __xfrm_state_put(struct xfrm_state *x)
756 atomic_dec(&x->refcnt);
759 static inline void xfrm_state_put(struct xfrm_state *x)
761 if (atomic_dec_and_test(&x->refcnt))
762 __xfrm_state_destroy(x);
765 static inline void xfrm_state_hold(struct xfrm_state *x)
767 atomic_inc(&x->refcnt);
770 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
777 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
778 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
781 if (memcmp(a1, a2, pdw << 2))
787 mask = htonl((0xffffffff) << (32 - pbi));
789 if ((a1[pdw] ^ a2[pdw]) & mask)
797 __be16 xfrm_flowi_sport(struct flowi *fl)
803 case IPPROTO_UDPLITE:
805 port = fl->fl_ip_sport;
809 port = htons(fl->fl_icmp_type);
812 port = htons(fl->fl_mh_type);
821 __be16 xfrm_flowi_dport(struct flowi *fl)
827 case IPPROTO_UDPLITE:
829 port = fl->fl_ip_dport;
833 port = htons(fl->fl_icmp_code);
841 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
842 unsigned short family);
844 #ifdef CONFIG_SECURITY_NETWORK_XFRM
845 /* If neither has a context --> match
846 * Otherwise, both must have a context and the sids, doi, alg must match
848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
850 return ((!s1 && !s2) ||
852 (s1->ctx_sid == s2->ctx_sid) &&
853 (s1->ctx_doi == s2->ctx_doi) &&
854 (s1->ctx_alg == s2->ctx_alg)));
857 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
863 /* A struct encoding bundle of transformations to apply to some set of flow.
865 * dst->child points to the next element of bundle.
866 * dst->xfrm points to an instanse of transformer.
868 * Due to unfortunate limitations of current routing cache, which we
869 * have no time to fix, it mirrors struct rtable and bound to the same
870 * routing key, including saddr,daddr. However, we can have many of
871 * bundles differing by session id. All the bundles grow from a parent
877 struct dst_entry dst;
881 struct dst_entry *route;
882 #ifdef CONFIG_XFRM_SUB_POLICY
883 struct flowi *origin;
884 struct xfrm_selector *partner;
887 u32 route_mtu_cached;
888 u32 child_mtu_cached;
894 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
896 dst_release(xdst->route);
897 if (likely(xdst->u.dst.xfrm))
898 xfrm_state_put(xdst->u.dst.xfrm);
899 #ifdef CONFIG_XFRM_SUB_POLICY
902 kfree(xdst->partner);
903 xdst->partner = NULL;
908 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
914 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
917 static inline struct sec_path *
918 secpath_get(struct sec_path *sp)
921 atomic_inc(&sp->refcnt);
925 extern void __secpath_destroy(struct sec_path *sp);
928 secpath_put(struct sec_path *sp)
930 if (sp && atomic_dec_and_test(&sp->refcnt))
931 __secpath_destroy(sp);
934 extern struct sec_path *secpath_dup(struct sec_path *src);
937 secpath_reset(struct sk_buff *skb)
940 secpath_put(skb->sp);
946 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
950 return addr->a4 == 0;
952 return ipv6_addr_any((struct in6_addr *)&addr->a6);
958 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
960 return (tmpl->saddr.a4 &&
961 tmpl->saddr.a4 != x->props.saddr.a4);
965 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
967 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
968 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
972 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
976 return __xfrm4_state_addr_cmp(tmpl, x);
978 return __xfrm6_state_addr_cmp(tmpl, x);
984 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
986 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
988 unsigned int family, int reverse)
990 struct net *net = dev_net(skb->dev);
991 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
993 if (sk && sk->sk_policy[XFRM_POLICY_IN])
994 return __xfrm_policy_check(sk, ndir, skb, family);
996 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
997 (skb_dst(skb)->flags & DST_NOPOLICY) ||
998 __xfrm_policy_check(sk, ndir, skb, family);
1001 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1003 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1006 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1008 return xfrm_policy_check(sk, dir, skb, AF_INET);
1011 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1013 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1016 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1017 struct sk_buff *skb)
1019 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1022 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1023 struct sk_buff *skb)
1025 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1028 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1029 unsigned int family, int reverse);
1031 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1032 unsigned int family)
1034 return __xfrm_decode_session(skb, fl, family, 0);
1037 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1039 unsigned int family)
1041 return __xfrm_decode_session(skb, fl, family, 1);
1044 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1046 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1048 struct net *net = dev_net(skb->dev);
1050 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1051 (skb_dst(skb)->flags & DST_NOXFRM) ||
1052 __xfrm_route_forward(skb, family);
1055 static inline int xfrm4_route_forward(struct sk_buff *skb)
1057 return xfrm_route_forward(skb, AF_INET);
1060 static inline int xfrm6_route_forward(struct sk_buff *skb)
1062 return xfrm_route_forward(skb, AF_INET6);
1065 extern int __xfrm_sk_clone_policy(struct sock *sk);
1067 static inline int xfrm_sk_clone_policy(struct sock *sk)
1069 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1070 return __xfrm_sk_clone_policy(sk);
1074 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1076 static inline void xfrm_sk_free_policy(struct sock *sk)
1078 if (unlikely(sk->sk_policy[0] != NULL)) {
1079 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1080 sk->sk_policy[0] = NULL;
1082 if (unlikely(sk->sk_policy[1] != NULL)) {
1083 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1084 sk->sk_policy[1] = NULL;
1090 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1091 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1092 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1093 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1094 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1098 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1106 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1108 unsigned int family)
1112 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1113 struct sk_buff *skb)
1117 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1125 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1129 return (xfrm_address_t *)&fl->fl4_dst;
1131 return (xfrm_address_t *)&fl->fl6_dst;
1137 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1141 return (xfrm_address_t *)&fl->fl4_src;
1143 return (xfrm_address_t *)&fl->fl6_src;
1149 void xfrm_flowi_addr_get(struct flowi *fl,
1150 xfrm_address_t *saddr, xfrm_address_t *daddr,
1151 unsigned short family)
1155 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1156 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1159 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1160 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1165 static __inline__ int
1166 __xfrm4_state_addr_check(struct xfrm_state *x,
1167 xfrm_address_t *daddr, xfrm_address_t *saddr)
1169 if (daddr->a4 == x->id.daddr.a4 &&
1170 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1175 static __inline__ int
1176 __xfrm6_state_addr_check(struct xfrm_state *x,
1177 xfrm_address_t *daddr, xfrm_address_t *saddr)
1179 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1180 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1181 ipv6_addr_any((struct in6_addr *)saddr) ||
1182 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1187 static __inline__ int
1188 xfrm_state_addr_check(struct xfrm_state *x,
1189 xfrm_address_t *daddr, xfrm_address_t *saddr,
1190 unsigned short family)
1194 return __xfrm4_state_addr_check(x, daddr, saddr);
1196 return __xfrm6_state_addr_check(x, daddr, saddr);
1201 static __inline__ int
1202 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1203 unsigned short family)
1207 return __xfrm4_state_addr_check(x,
1208 (xfrm_address_t *)&fl->fl4_dst,
1209 (xfrm_address_t *)&fl->fl4_src);
1211 return __xfrm6_state_addr_check(x,
1212 (xfrm_address_t *)&fl->fl6_dst,
1213 (xfrm_address_t *)&fl->fl6_src);
1218 static inline int xfrm_state_kern(struct xfrm_state *x)
1220 return atomic_read(&x->tunnel_users);
1223 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1225 return (!userproto || proto == userproto ||
1226 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1227 proto == IPPROTO_ESP ||
1228 proto == IPPROTO_COMP)));
1232 * xfrm algorithm information
1234 struct xfrm_algo_aead_info {
1238 struct xfrm_algo_auth_info {
1243 struct xfrm_algo_encr_info {
1248 struct xfrm_algo_comp_info {
1252 struct xfrm_algo_desc {
1257 struct xfrm_algo_aead_info aead;
1258 struct xfrm_algo_auth_info auth;
1259 struct xfrm_algo_encr_info encr;
1260 struct xfrm_algo_comp_info comp;
1262 struct sadb_alg desc;
1265 /* XFRM tunnel handlers. */
1266 struct xfrm_tunnel {
1267 int (*handler)(struct sk_buff *skb);
1268 int (*err_handler)(struct sk_buff *skb, __u32 info);
1270 struct xfrm_tunnel *next;
1274 struct xfrm6_tunnel {
1275 int (*handler)(struct sk_buff *skb);
1276 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1277 int type, int code, int offset, __be32 info);
1278 struct xfrm6_tunnel *next;
1282 extern void xfrm_init(void);
1283 extern void xfrm4_init(void);
1284 extern int xfrm_state_init(struct net *net);
1285 extern void xfrm_state_fini(struct net *net);
1286 extern void xfrm4_state_init(void);
1288 extern int xfrm6_init(void);
1289 extern void xfrm6_fini(void);
1290 extern int xfrm6_state_init(void);
1291 extern void xfrm6_state_fini(void);
1293 static inline int xfrm6_init(void)
1297 static inline void xfrm6_fini(void)
1303 #ifdef CONFIG_XFRM_STATISTICS
1304 extern int xfrm_proc_init(struct net *net);
1305 extern void xfrm_proc_fini(struct net *net);
1308 extern int xfrm_sysctl_init(struct net *net);
1309 #ifdef CONFIG_SYSCTL
1310 extern void xfrm_sysctl_fini(struct net *net);
1312 static inline void xfrm_sysctl_fini(struct net *net)
1317 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1318 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1319 int (*func)(struct xfrm_state *, int, void*), void *);
1320 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1321 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1322 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1323 struct flowi *fl, struct xfrm_tmpl *tmpl,
1324 struct xfrm_policy *pol, int *err,
1325 unsigned short family);
1326 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1327 xfrm_address_t *daddr,
1328 xfrm_address_t *saddr,
1329 unsigned short family,
1330 u8 mode, u8 proto, u32 reqid);
1331 extern int xfrm_state_check_expire(struct xfrm_state *x);
1332 extern void xfrm_state_insert(struct xfrm_state *x);
1333 extern int xfrm_state_add(struct xfrm_state *x);
1334 extern int xfrm_state_update(struct xfrm_state *x);
1335 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1336 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1337 #ifdef CONFIG_XFRM_SUB_POLICY
1338 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1339 int n, unsigned short family);
1340 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1341 int n, unsigned short family);
1343 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1344 int n, unsigned short family)
1349 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1350 int n, unsigned short family)
1356 struct xfrmk_sadinfo {
1357 u32 sadhcnt; /* current hash bkts */
1358 u32 sadhmcnt; /* max allowed hash bkts */
1359 u32 sadcnt; /* current running count */
1362 struct xfrmk_spdinfo {
1373 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1374 extern int xfrm_state_delete(struct xfrm_state *x);
1375 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1376 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1377 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1378 extern int xfrm_replay_check(struct xfrm_state *x,
1379 struct sk_buff *skb, __be32 seq);
1380 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1381 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1382 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1383 extern int xfrm_init_state(struct xfrm_state *x);
1384 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1387 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1388 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1389 extern int xfrm_output(struct sk_buff *skb);
1390 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1391 extern int xfrm4_extract_header(struct sk_buff *skb);
1392 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1393 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1395 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1396 extern int xfrm4_rcv(struct sk_buff *skb);
1398 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1400 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1403 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1405 extern int xfrm4_output(struct sk_buff *skb);
1406 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1407 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1408 extern int xfrm6_extract_header(struct sk_buff *skb);
1409 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1410 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1411 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1412 extern int xfrm6_rcv(struct sk_buff *skb);
1413 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1414 xfrm_address_t *saddr, u8 proto);
1415 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1416 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1417 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1418 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1419 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1420 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1421 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1422 extern int xfrm6_output(struct sk_buff *skb);
1423 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1427 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1428 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1430 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1432 return -ENOPROTOOPT;
1435 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1437 /* should not happen */
1443 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1445 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1446 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1447 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1448 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1449 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1450 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1451 struct xfrm_selector *sel,
1452 struct xfrm_sec_ctx *ctx, int delete,
1454 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1455 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1456 u32 xfrm_get_acqseq(void);
1457 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1458 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1459 xfrm_address_t *daddr, xfrm_address_t *saddr,
1460 int create, unsigned short family);
1461 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1462 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1463 struct flowi *fl, int family, int strict);
1465 #ifdef CONFIG_XFRM_MIGRATE
1466 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1467 struct xfrm_migrate *m, int num_bundles,
1468 struct xfrm_kmaddress *k);
1469 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1470 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1471 struct xfrm_migrate *m);
1472 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1473 struct xfrm_migrate *m, int num_bundles,
1474 struct xfrm_kmaddress *k);
1477 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1478 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1479 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1481 extern void xfrm_input_init(void);
1482 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1484 extern void xfrm_probe_algs(void);
1485 extern int xfrm_count_auth_supported(void);
1486 extern int xfrm_count_enc_supported(void);
1487 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1488 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1489 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1490 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1491 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1492 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1493 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1494 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1495 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1500 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1503 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1504 int offset, int len, icv_update_fn_t icv_update);
1506 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1512 return (__force __u32)a->a4 - (__force __u32)b->a4;
1514 return ipv6_addr_cmp((struct in6_addr *)a,
1515 (struct in6_addr *)b);
1519 static inline int xfrm_policy_id2dir(u32 index)
1525 static inline int xfrm_aevent_is_on(struct net *net)
1531 nlsk = rcu_dereference(net->xfrm.nlsk);
1533 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1539 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1541 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1544 #ifdef CONFIG_XFRM_MIGRATE
1545 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1547 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1550 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1553 for (i = 0; i < n; i++)
1554 xfrm_state_put(*(states + i));
1557 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1560 for (i = 0; i < n; i++)
1561 xfrm_state_delete(*(states + i));
1566 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1568 return skb->sp->xvec[skb->sp->len - 1];
1572 #endif /* _NET_XFRM_H */