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 u32 sysctl_xfrm_aevent_etime;
52 extern u32 sysctl_xfrm_aevent_rseqth;
53 extern int sysctl_xfrm_larval_drop;
54 extern u32 sysctl_xfrm_acq_expires;
56 extern struct mutex xfrm_cfg_mutex;
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72 Lookup is plain linear search until the first match with selector.
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
86 Bundles are cached at xrfm_policy struct (field ->bundles).
89 Resolution of xrfm_tmpl
90 -----------------------
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
119 struct xfrm_state_walk {
120 struct list_head all;
129 /* Full description of state of transformer. */
136 struct hlist_node gclist;
137 struct hlist_node bydst;
139 struct hlist_node bysrc;
140 struct hlist_node byspi;
146 struct xfrm_selector sel;
150 /* Key manager bits */
151 struct xfrm_state_walk km;
153 /* Parameters of this state. */
158 u8 aalgo, ealgo, calgo;
161 xfrm_address_t saddr;
166 struct xfrm_lifetime_cfg lft;
168 /* Data for transformer */
169 struct xfrm_algo *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
192 /* internal flag that only holds state for delayed aevent at the
197 /* Replay detection notification settings */
201 /* Replay detection notification timer */
202 struct timer_list rtimer;
205 struct xfrm_stats stats;
207 struct xfrm_lifetime_cur curlft;
208 struct timer_list timer;
211 unsigned long lastused;
213 /* Reference to data common to all the instances of this
215 const struct xfrm_type *type;
216 struct xfrm_mode *inner_mode;
217 struct xfrm_mode *inner_mode_iaf;
218 struct xfrm_mode *outer_mode;
220 /* Security context */
221 struct xfrm_sec_ctx *security;
223 /* Private data of this transformer, format is opaque,
224 * interpreted by xfrm_type methods. */
228 static inline struct net *xs_net(struct xfrm_state *x)
230 return read_pnet(&x->xs_net);
233 /* xflags - make enum if more show up */
234 #define XFRM_TIME_DEFER 1
245 /* callback structure passed from either netlink or pfkey */
264 struct xfrm_policy_afinfo {
265 unsigned short family;
266 struct dst_ops *dst_ops;
267 void (*garbage_collect)(struct net *net);
268 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
269 xfrm_address_t *daddr);
270 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
271 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
272 void (*decode_session)(struct sk_buff *skb,
275 int (*get_tos)(struct flowi *fl);
276 int (*init_path)(struct xfrm_dst *path,
277 struct dst_entry *dst,
279 int (*fill_dst)(struct xfrm_dst *xdst,
280 struct net_device *dev);
283 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
284 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
285 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
286 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
289 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
290 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
291 extern int __xfrm_state_delete(struct xfrm_state *x);
293 struct xfrm_state_afinfo {
297 struct module *owner;
298 const struct xfrm_type *type_map[IPPROTO_MAX];
299 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
300 int (*init_flags)(struct xfrm_state *x);
301 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
302 struct xfrm_tmpl *tmpl,
303 xfrm_address_t *daddr, xfrm_address_t *saddr);
304 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
305 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
306 int (*output)(struct sk_buff *skb);
307 int (*extract_input)(struct xfrm_state *x,
308 struct sk_buff *skb);
309 int (*extract_output)(struct xfrm_state *x,
310 struct sk_buff *skb);
311 int (*transport_finish)(struct sk_buff *skb,
315 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
316 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
318 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
323 struct module *owner;
326 #define XFRM_TYPE_NON_FRAGMENT 1
327 #define XFRM_TYPE_REPLAY_PROT 2
328 #define XFRM_TYPE_LOCAL_COADDR 4
329 #define XFRM_TYPE_REMOTE_COADDR 8
331 int (*init_state)(struct xfrm_state *x);
332 void (*destructor)(struct xfrm_state *);
333 int (*input)(struct xfrm_state *, struct sk_buff *skb);
334 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
335 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
336 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
337 /* Estimate maximal size of result of transformation of a dgram */
338 u32 (*get_mtu)(struct xfrm_state *, int size);
341 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
342 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
346 * Remove encapsulation header.
348 * The IP header will be moved over the top of the encapsulation
351 * On entry, the transport header shall point to where the IP header
352 * should be and the network header shall be set to where the IP
353 * header currently is. skb->data shall point to the start of the
356 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
359 * This is the actual input entry point.
361 * For transport mode and equivalent this would be identical to
362 * input2 (which does not need to be set). While tunnel mode
363 * and equivalent would set this to the tunnel encapsulation function
364 * xfrm4_prepare_input that would in turn call input2.
366 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
369 * Add encapsulation header.
371 * On exit, the transport header will be set to the start of the
372 * encapsulation header to be filled in by x->type->output and
373 * the mac header will be set to the nextheader (protocol for
374 * IPv4) field of the extension header directly preceding the
375 * encapsulation header, or in its absence, that of the top IP
376 * header. The value of the network header will always point
377 * to the top IP header while skb->data will point to the payload.
379 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
382 * This is the actual output entry point.
384 * For transport mode and equivalent this would be identical to
385 * output2 (which does not need to be set). While tunnel mode
386 * and equivalent would set this to a tunnel encapsulation function
387 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
390 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
392 struct xfrm_state_afinfo *afinfo;
393 struct module *owner;
398 /* Flags for xfrm_mode. */
400 XFRM_MODE_FLAG_TUNNEL = 1,
403 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
404 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
406 static inline int xfrm_af2proto(unsigned int family)
418 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
420 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
421 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
422 return x->inner_mode;
424 return x->inner_mode_iaf;
429 /* id in template is interpreted as:
430 * daddr - destination of tunnel, may be zero for transport mode.
431 * spi - zero to acquire spi. Not zero if spi is static, then
432 * daddr must be fixed too.
433 * proto - AH/ESP/IPCOMP
437 /* Source address of tunnel. Ignored, if it is not a tunnel. */
438 xfrm_address_t saddr;
440 unsigned short encap_family;
444 /* Mode: transport, tunnel etc. */
447 /* Sharing mode: unique, this session only, this user only etc. */
450 /* May skip this transfomration if no SA is found */
453 /* Skip aalgos/ealgos/calgos checks. */
456 /* Bit mask of algos allowed for acquisition */
462 #define XFRM_MAX_DEPTH 6
464 struct xfrm_policy_walk_entry {
465 struct list_head all;
469 struct xfrm_policy_walk {
470 struct xfrm_policy_walk_entry walk;
480 struct hlist_node bydst;
481 struct hlist_node byidx;
483 /* This lock only affects elements except for entry. */
486 struct timer_list timer;
490 struct xfrm_selector selector;
491 struct xfrm_lifetime_cfg lft;
492 struct xfrm_lifetime_cur curlft;
493 struct dst_entry *bundles;
494 struct xfrm_policy_walk_entry walk;
500 struct xfrm_sec_ctx *security;
501 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
504 static inline struct net *xp_net(struct xfrm_policy *xp)
506 return read_pnet(&xp->xp_net);
509 struct xfrm_kmaddress {
510 xfrm_address_t local;
511 xfrm_address_t remote;
516 struct xfrm_migrate {
517 xfrm_address_t old_daddr;
518 xfrm_address_t old_saddr;
519 xfrm_address_t new_daddr;
520 xfrm_address_t new_saddr;
529 #define XFRM_KM_TIMEOUT 30
531 #define XFRM_REPLAY_SEQ 1
532 #define XFRM_REPLAY_OSEQ 2
533 #define XFRM_REPLAY_SEQ_MASK 3
535 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
536 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
538 /* default aevent timeout in units of 100ms */
539 #define XFRM_AE_ETIME 10
540 /* Async Event timer multiplier */
541 #define XFRM_AE_ETH_M 10
542 /* default seq threshold size */
543 #define XFRM_AE_SEQT_SIZE 2
547 struct list_head list;
549 int (*notify)(struct xfrm_state *x, struct km_event *c);
550 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
551 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
552 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
553 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
554 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
555 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
558 extern int xfrm_register_km(struct xfrm_mgr *km);
559 extern int xfrm_unregister_km(struct xfrm_mgr *km);
562 * This structure is used for the duration where packets are being
563 * transformed by IPsec. As soon as the packet leaves IPsec the
564 * area beyond the generic IP part may be overwritten.
568 struct inet_skb_parm h4;
569 struct inet6_skb_parm h6;
572 /* Sequence number for replay protection. */
579 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
582 * This structure is used by the afinfo prepare_input/prepare_output functions
583 * to transmit header information to the mode input/output functions.
585 struct xfrm_mode_skb_cb {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
591 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
595 /* IP header length (excluding options or extension headers). */
598 /* TOS for IPv4, class for IPv6. */
601 /* TTL for IPv4, hop limitfor IPv6. */
604 /* Protocol for IPv4, NH for IPv6. */
607 /* Option length for IPv4, zero for IPv6. */
610 /* Used by IPv6 only, zero for IPv4. */
614 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
617 * This structure is used by the input processing to locate the SPI and
618 * related information.
620 struct xfrm_spi_skb_cb {
622 struct inet_skb_parm h4;
623 struct inet6_skb_parm h6;
626 unsigned int daddroff;
630 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
632 /* Audit Information */
640 #ifdef CONFIG_AUDITSYSCALL
641 static inline struct audit_buffer *xfrm_audit_start(const char *op)
643 struct audit_buffer *audit_buf = NULL;
645 if (audit_enabled == 0)
647 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
648 AUDIT_MAC_IPSEC_EVENT);
649 if (audit_buf == NULL)
651 audit_log_format(audit_buf, "op=%s", op);
655 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
656 struct audit_buffer *audit_buf)
661 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
663 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
664 audit_log_format(audit_buf, " subj=%s", secctx);
665 security_release_secctx(secctx, secctx_len);
667 audit_log_task_context(audit_buf);
670 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
671 u32 auid, u32 ses, u32 secid);
672 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
673 u32 auid, u32 ses, u32 secid);
674 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
675 u32 auid, u32 ses, u32 secid);
676 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
677 u32 auid, u32 ses, u32 secid);
678 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
679 struct sk_buff *skb);
680 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
681 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
682 __be32 net_spi, __be32 net_seq);
683 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
684 struct sk_buff *skb, u8 proto);
687 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
688 u32 auid, u32 ses, u32 secid)
692 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
693 u32 auid, u32 ses, u32 secid)
697 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
698 u32 auid, u32 ses, u32 secid)
702 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
703 u32 auid, u32 ses, u32 secid)
707 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
712 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
717 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
718 __be32 net_spi, __be32 net_seq)
722 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
723 struct sk_buff *skb, u8 proto)
726 #endif /* CONFIG_AUDITSYSCALL */
728 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
730 if (likely(policy != NULL))
731 atomic_inc(&policy->refcnt);
734 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
736 static inline void xfrm_pol_put(struct xfrm_policy *policy)
738 if (atomic_dec_and_test(&policy->refcnt))
739 xfrm_policy_destroy(policy);
742 #ifdef CONFIG_XFRM_SUB_POLICY
743 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
746 for (i = npols - 1; i >= 0; --i)
747 xfrm_pol_put(pols[i]);
750 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
752 xfrm_pol_put(pols[0]);
756 extern void __xfrm_state_destroy(struct xfrm_state *);
758 static inline void __xfrm_state_put(struct xfrm_state *x)
760 atomic_dec(&x->refcnt);
763 static inline void xfrm_state_put(struct xfrm_state *x)
765 if (atomic_dec_and_test(&x->refcnt))
766 __xfrm_state_destroy(x);
769 static inline void xfrm_state_hold(struct xfrm_state *x)
771 atomic_inc(&x->refcnt);
774 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
781 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
782 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
785 if (memcmp(a1, a2, pdw << 2))
791 mask = htonl((0xffffffff) << (32 - pbi));
793 if ((a1[pdw] ^ a2[pdw]) & mask)
801 __be16 xfrm_flowi_sport(struct flowi *fl)
807 case IPPROTO_UDPLITE:
809 port = fl->fl_ip_sport;
813 port = htons(fl->fl_icmp_type);
816 port = htons(fl->fl_mh_type);
825 __be16 xfrm_flowi_dport(struct flowi *fl)
831 case IPPROTO_UDPLITE:
833 port = fl->fl_ip_dport;
837 port = htons(fl->fl_icmp_code);
845 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
846 unsigned short family);
848 #ifdef CONFIG_SECURITY_NETWORK_XFRM
849 /* If neither has a context --> match
850 * Otherwise, both must have a context and the sids, doi, alg must match
852 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
854 return ((!s1 && !s2) ||
856 (s1->ctx_sid == s2->ctx_sid) &&
857 (s1->ctx_doi == s2->ctx_doi) &&
858 (s1->ctx_alg == s2->ctx_alg)));
861 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
867 /* A struct encoding bundle of transformations to apply to some set of flow.
869 * dst->child points to the next element of bundle.
870 * dst->xfrm points to an instanse of transformer.
872 * Due to unfortunate limitations of current routing cache, which we
873 * have no time to fix, it mirrors struct rtable and bound to the same
874 * routing key, including saddr,daddr. However, we can have many of
875 * bundles differing by session id. All the bundles grow from a parent
881 struct dst_entry dst;
885 struct dst_entry *route;
886 #ifdef CONFIG_XFRM_SUB_POLICY
887 struct flowi *origin;
888 struct xfrm_selector *partner;
891 u32 route_mtu_cached;
892 u32 child_mtu_cached;
898 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
900 dst_release(xdst->route);
901 if (likely(xdst->u.dst.xfrm))
902 xfrm_state_put(xdst->u.dst.xfrm);
903 #ifdef CONFIG_XFRM_SUB_POLICY
906 kfree(xdst->partner);
907 xdst->partner = NULL;
912 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
918 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
921 static inline struct sec_path *
922 secpath_get(struct sec_path *sp)
925 atomic_inc(&sp->refcnt);
929 extern void __secpath_destroy(struct sec_path *sp);
932 secpath_put(struct sec_path *sp)
934 if (sp && atomic_dec_and_test(&sp->refcnt))
935 __secpath_destroy(sp);
938 extern struct sec_path *secpath_dup(struct sec_path *src);
941 secpath_reset(struct sk_buff *skb)
944 secpath_put(skb->sp);
950 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
954 return addr->a4 == 0;
956 return ipv6_addr_any((struct in6_addr *)&addr->a6);
962 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
964 return (tmpl->saddr.a4 &&
965 tmpl->saddr.a4 != x->props.saddr.a4);
969 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
971 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
972 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
976 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
980 return __xfrm4_state_addr_cmp(tmpl, x);
982 return __xfrm6_state_addr_cmp(tmpl, x);
988 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
990 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
992 unsigned int family, int reverse)
994 struct net *net = dev_net(skb->dev);
995 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
997 if (sk && sk->sk_policy[XFRM_POLICY_IN])
998 return __xfrm_policy_check(sk, ndir, skb, family);
1000 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1001 (skb->dst->flags & DST_NOPOLICY) ||
1002 __xfrm_policy_check(sk, ndir, skb, family);
1005 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1007 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1010 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1012 return xfrm_policy_check(sk, dir, skb, AF_INET);
1015 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1017 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1020 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1021 struct sk_buff *skb)
1023 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1026 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1027 struct sk_buff *skb)
1029 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1032 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1033 unsigned int family, int reverse);
1035 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1036 unsigned int family)
1038 return __xfrm_decode_session(skb, fl, family, 0);
1041 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1043 unsigned int family)
1045 return __xfrm_decode_session(skb, fl, family, 1);
1048 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1050 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1052 struct net *net = dev_net(skb->dev);
1054 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1055 (skb->dst->flags & DST_NOXFRM) ||
1056 __xfrm_route_forward(skb, family);
1059 static inline int xfrm4_route_forward(struct sk_buff *skb)
1061 return xfrm_route_forward(skb, AF_INET);
1064 static inline int xfrm6_route_forward(struct sk_buff *skb)
1066 return xfrm_route_forward(skb, AF_INET6);
1069 extern int __xfrm_sk_clone_policy(struct sock *sk);
1071 static inline int xfrm_sk_clone_policy(struct sock *sk)
1073 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1074 return __xfrm_sk_clone_policy(sk);
1078 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1080 static inline void xfrm_sk_free_policy(struct sock *sk)
1082 if (unlikely(sk->sk_policy[0] != NULL)) {
1083 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1084 sk->sk_policy[0] = NULL;
1086 if (unlikely(sk->sk_policy[1] != NULL)) {
1087 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1088 sk->sk_policy[1] = NULL;
1094 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1095 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1096 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1097 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1098 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1102 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1106 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1110 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1112 unsigned int family)
1116 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1121 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1122 struct sk_buff *skb)
1129 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1133 return (xfrm_address_t *)&fl->fl4_dst;
1135 return (xfrm_address_t *)&fl->fl6_dst;
1141 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1145 return (xfrm_address_t *)&fl->fl4_src;
1147 return (xfrm_address_t *)&fl->fl6_src;
1153 void xfrm_flowi_addr_get(struct flowi *fl,
1154 xfrm_address_t *saddr, xfrm_address_t *daddr,
1155 unsigned short family)
1159 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1160 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1163 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1164 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1169 static __inline__ int
1170 __xfrm4_state_addr_check(struct xfrm_state *x,
1171 xfrm_address_t *daddr, xfrm_address_t *saddr)
1173 if (daddr->a4 == x->id.daddr.a4 &&
1174 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1179 static __inline__ int
1180 __xfrm6_state_addr_check(struct xfrm_state *x,
1181 xfrm_address_t *daddr, xfrm_address_t *saddr)
1183 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1184 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1185 ipv6_addr_any((struct in6_addr *)saddr) ||
1186 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1191 static __inline__ int
1192 xfrm_state_addr_check(struct xfrm_state *x,
1193 xfrm_address_t *daddr, xfrm_address_t *saddr,
1194 unsigned short family)
1198 return __xfrm4_state_addr_check(x, daddr, saddr);
1200 return __xfrm6_state_addr_check(x, daddr, saddr);
1205 static __inline__ int
1206 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1207 unsigned short family)
1211 return __xfrm4_state_addr_check(x,
1212 (xfrm_address_t *)&fl->fl4_dst,
1213 (xfrm_address_t *)&fl->fl4_src);
1215 return __xfrm6_state_addr_check(x,
1216 (xfrm_address_t *)&fl->fl6_dst,
1217 (xfrm_address_t *)&fl->fl6_src);
1222 static inline int xfrm_state_kern(struct xfrm_state *x)
1224 return atomic_read(&x->tunnel_users);
1227 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1229 return (!userproto || proto == userproto ||
1230 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1231 proto == IPPROTO_ESP ||
1232 proto == IPPROTO_COMP)));
1236 * xfrm algorithm information
1238 struct xfrm_algo_aead_info {
1242 struct xfrm_algo_auth_info {
1247 struct xfrm_algo_encr_info {
1252 struct xfrm_algo_comp_info {
1256 struct xfrm_algo_desc {
1261 struct xfrm_algo_aead_info aead;
1262 struct xfrm_algo_auth_info auth;
1263 struct xfrm_algo_encr_info encr;
1264 struct xfrm_algo_comp_info comp;
1266 struct sadb_alg desc;
1269 /* XFRM tunnel handlers. */
1270 struct xfrm_tunnel {
1271 int (*handler)(struct sk_buff *skb);
1272 int (*err_handler)(struct sk_buff *skb, __u32 info);
1274 struct xfrm_tunnel *next;
1278 struct xfrm6_tunnel {
1279 int (*handler)(struct sk_buff *skb);
1280 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1281 int type, int code, int offset, __be32 info);
1282 struct xfrm6_tunnel *next;
1286 extern void xfrm_init(void);
1287 extern void xfrm4_init(void);
1288 extern int xfrm_state_init(struct net *net);
1289 extern void xfrm_state_fini(struct net *net);
1290 extern void xfrm4_state_init(void);
1292 extern int xfrm6_init(void);
1293 extern void xfrm6_fini(void);
1294 extern int xfrm6_state_init(void);
1295 extern void xfrm6_state_fini(void);
1297 static inline int xfrm6_init(void)
1301 static inline void xfrm6_fini(void)
1307 #ifdef CONFIG_XFRM_STATISTICS
1308 extern int xfrm_proc_init(void);
1311 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1312 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1313 int (*func)(struct xfrm_state *, int, void*), void *);
1314 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1315 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1316 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1317 struct flowi *fl, struct xfrm_tmpl *tmpl,
1318 struct xfrm_policy *pol, int *err,
1319 unsigned short family);
1320 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1321 xfrm_address_t *daddr,
1322 xfrm_address_t *saddr,
1323 unsigned short family,
1324 u8 mode, u8 proto, u32 reqid);
1325 extern int xfrm_state_check_expire(struct xfrm_state *x);
1326 extern void xfrm_state_insert(struct xfrm_state *x);
1327 extern int xfrm_state_add(struct xfrm_state *x);
1328 extern int xfrm_state_update(struct xfrm_state *x);
1329 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1330 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1331 #ifdef CONFIG_XFRM_SUB_POLICY
1332 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1333 int n, unsigned short family);
1334 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335 int n, unsigned short family);
1337 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1338 int n, unsigned short family)
1343 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344 int n, unsigned short family)
1350 struct xfrmk_sadinfo {
1351 u32 sadhcnt; /* current hash bkts */
1352 u32 sadhmcnt; /* max allowed hash bkts */
1353 u32 sadcnt; /* current running count */
1356 struct xfrmk_spdinfo {
1367 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1368 extern int xfrm_state_delete(struct xfrm_state *x);
1369 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1370 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1371 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1372 extern int xfrm_replay_check(struct xfrm_state *x,
1373 struct sk_buff *skb, __be32 seq);
1374 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1375 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1376 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1377 extern int xfrm_init_state(struct xfrm_state *x);
1378 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1381 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1382 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1383 extern int xfrm_output(struct sk_buff *skb);
1384 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm4_extract_header(struct sk_buff *skb);
1386 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1389 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1390 extern int xfrm4_rcv(struct sk_buff *skb);
1392 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1394 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1397 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm4_output(struct sk_buff *skb);
1400 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1401 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1402 extern int xfrm6_extract_header(struct sk_buff *skb);
1403 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1405 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1406 extern int xfrm6_rcv(struct sk_buff *skb);
1407 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1408 xfrm_address_t *saddr, u8 proto);
1409 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1410 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1411 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1412 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1413 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1414 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1416 extern int xfrm6_output(struct sk_buff *skb);
1417 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1421 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1422 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1424 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1426 return -ENOPROTOOPT;
1429 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1431 /* should not happen */
1437 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1439 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1440 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1441 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1442 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1443 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1444 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1445 struct xfrm_selector *sel,
1446 struct xfrm_sec_ctx *ctx, int delete,
1448 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1449 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1450 u32 xfrm_get_acqseq(void);
1451 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1452 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1453 xfrm_address_t *daddr, xfrm_address_t *saddr,
1454 int create, unsigned short family);
1455 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1456 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1457 struct flowi *fl, int family, int strict);
1459 #ifdef CONFIG_XFRM_MIGRATE
1460 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1461 struct xfrm_migrate *m, int num_bundles,
1462 struct xfrm_kmaddress *k);
1463 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1464 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1465 struct xfrm_migrate *m);
1466 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1467 struct xfrm_migrate *m, int num_bundles,
1468 struct xfrm_kmaddress *k);
1471 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1472 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1473 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1475 extern void xfrm_input_init(void);
1476 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1478 extern void xfrm_probe_algs(void);
1479 extern int xfrm_count_auth_supported(void);
1480 extern int xfrm_count_enc_supported(void);
1481 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1482 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1485 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1486 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1487 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1488 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1489 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1494 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1497 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1498 int offset, int len, icv_update_fn_t icv_update);
1500 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1506 return (__force __u32)a->a4 - (__force __u32)b->a4;
1508 return ipv6_addr_cmp((struct in6_addr *)a,
1509 (struct in6_addr *)b);
1513 static inline int xfrm_policy_id2dir(u32 index)
1519 static inline int xfrm_aevent_is_on(struct net *net)
1525 nlsk = rcu_dereference(net->xfrm.nlsk);
1527 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1533 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1535 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1538 #ifdef CONFIG_XFRM_MIGRATE
1539 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1541 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1544 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1547 for (i = 0; i < n; i++)
1548 xfrm_state_put(*(states + i));
1551 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1554 for (i = 0; i < n; i++)
1555 xfrm_state_delete(*(states + i));
1560 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1562 return skb->sp->xvec[skb->sp->len - 1];
1566 #endif /* _NET_XFRM_H */