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 struct xfrm_state_walk {
121 struct list_head all;
130 /* Full description of state of transformer. */
137 struct hlist_node gclist;
138 struct hlist_node bydst;
140 struct hlist_node bysrc;
141 struct hlist_node byspi;
147 struct xfrm_selector sel;
151 /* Key manager bits */
152 struct xfrm_state_walk km;
154 /* Parameters of this state. */
159 u8 aalgo, ealgo, calgo;
162 xfrm_address_t saddr;
167 struct xfrm_lifetime_cfg lft;
169 /* Data for transformer */
170 struct xfrm_algo *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
193 /* internal flag that only holds state for delayed aevent at the
198 /* Replay detection notification settings */
202 /* Replay detection notification timer */
203 struct timer_list rtimer;
206 struct xfrm_stats stats;
208 struct xfrm_lifetime_cur curlft;
209 struct timer_list timer;
212 unsigned long lastused;
214 /* Reference to data common to all the instances of this
216 const struct xfrm_type *type;
217 struct xfrm_mode *inner_mode;
218 struct xfrm_mode *inner_mode_iaf;
219 struct xfrm_mode *outer_mode;
221 /* Security context */
222 struct xfrm_sec_ctx *security;
224 /* Private data of this transformer, format is opaque,
225 * interpreted by xfrm_type methods. */
229 static inline struct net *xs_net(struct xfrm_state *x)
231 return read_pnet(&x->xs_net);
234 /* xflags - make enum if more show up */
235 #define XFRM_TIME_DEFER 1
246 /* callback structure passed from either netlink or pfkey */
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(void);
269 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
270 xfrm_address_t *daddr);
271 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
272 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
273 void (*decode_session)(struct sk_buff *skb,
276 int (*get_tos)(struct flowi *fl);
277 int (*init_path)(struct xfrm_dst *path,
278 struct dst_entry *dst,
280 int (*fill_dst)(struct xfrm_dst *xdst,
281 struct net_device *dev);
284 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
285 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
287 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
290 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
291 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
292 extern int __xfrm_state_delete(struct xfrm_state *x);
294 struct xfrm_state_afinfo {
298 struct module *owner;
299 const struct xfrm_type *type_map[IPPROTO_MAX];
300 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
301 int (*init_flags)(struct xfrm_state *x);
302 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
303 struct xfrm_tmpl *tmpl,
304 xfrm_address_t *daddr, xfrm_address_t *saddr);
305 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
306 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
307 int (*output)(struct sk_buff *skb);
308 int (*extract_input)(struct xfrm_state *x,
309 struct sk_buff *skb);
310 int (*extract_output)(struct xfrm_state *x,
311 struct sk_buff *skb);
312 int (*transport_finish)(struct sk_buff *skb,
316 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
317 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
319 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
324 struct module *owner;
327 #define XFRM_TYPE_NON_FRAGMENT 1
328 #define XFRM_TYPE_REPLAY_PROT 2
329 #define XFRM_TYPE_LOCAL_COADDR 4
330 #define XFRM_TYPE_REMOTE_COADDR 8
332 int (*init_state)(struct xfrm_state *x);
333 void (*destructor)(struct xfrm_state *);
334 int (*input)(struct xfrm_state *, struct sk_buff *skb);
335 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
336 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
337 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
338 /* Estimate maximal size of result of transformation of a dgram */
339 u32 (*get_mtu)(struct xfrm_state *, int size);
342 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
343 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
347 * Remove encapsulation header.
349 * The IP header will be moved over the top of the encapsulation
352 * On entry, the transport header shall point to where the IP header
353 * should be and the network header shall be set to where the IP
354 * header currently is. skb->data shall point to the start of the
357 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
360 * This is the actual input entry point.
362 * For transport mode and equivalent this would be identical to
363 * input2 (which does not need to be set). While tunnel mode
364 * and equivalent would set this to the tunnel encapsulation function
365 * xfrm4_prepare_input that would in turn call input2.
367 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
370 * Add encapsulation header.
372 * On exit, the transport header will be set to the start of the
373 * encapsulation header to be filled in by x->type->output and
374 * the mac header will be set to the nextheader (protocol for
375 * IPv4) field of the extension header directly preceding the
376 * encapsulation header, or in its absence, that of the top IP
377 * header. The value of the network header will always point
378 * to the top IP header while skb->data will point to the payload.
380 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
383 * This is the actual output entry point.
385 * For transport mode and equivalent this would be identical to
386 * output2 (which does not need to be set). While tunnel mode
387 * and equivalent would set this to a tunnel encapsulation function
388 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
391 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
393 struct xfrm_state_afinfo *afinfo;
394 struct module *owner;
399 /* Flags for xfrm_mode. */
401 XFRM_MODE_FLAG_TUNNEL = 1,
404 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
405 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
407 static inline int xfrm_af2proto(unsigned int family)
419 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
421 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
422 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
423 return x->inner_mode;
425 return x->inner_mode_iaf;
430 /* id in template is interpreted as:
431 * daddr - destination of tunnel, may be zero for transport mode.
432 * spi - zero to acquire spi. Not zero if spi is static, then
433 * daddr must be fixed too.
434 * proto - AH/ESP/IPCOMP
438 /* Source address of tunnel. Ignored, if it is not a tunnel. */
439 xfrm_address_t saddr;
441 unsigned short encap_family;
445 /* Mode: transport, tunnel etc. */
448 /* Sharing mode: unique, this session only, this user only etc. */
451 /* May skip this transfomration if no SA is found */
454 /* Skip aalgos/ealgos/calgos checks. */
457 /* Bit mask of algos allowed for acquisition */
463 #define XFRM_MAX_DEPTH 6
465 struct xfrm_policy_walk_entry {
466 struct list_head all;
470 struct xfrm_policy_walk {
471 struct xfrm_policy_walk_entry walk;
478 struct hlist_node bydst;
479 struct hlist_node byidx;
481 /* This lock only affects elements except for entry. */
484 struct timer_list timer;
488 struct xfrm_selector selector;
489 struct xfrm_lifetime_cfg lft;
490 struct xfrm_lifetime_cur curlft;
491 struct dst_entry *bundles;
492 struct xfrm_policy_walk_entry walk;
498 struct xfrm_sec_ctx *security;
499 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
502 struct xfrm_kmaddress {
503 xfrm_address_t local;
504 xfrm_address_t remote;
509 struct xfrm_migrate {
510 xfrm_address_t old_daddr;
511 xfrm_address_t old_saddr;
512 xfrm_address_t new_daddr;
513 xfrm_address_t new_saddr;
522 #define XFRM_KM_TIMEOUT 30
524 #define XFRM_REPLAY_SEQ 1
525 #define XFRM_REPLAY_OSEQ 2
526 #define XFRM_REPLAY_SEQ_MASK 3
528 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
529 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
531 /* default aevent timeout in units of 100ms */
532 #define XFRM_AE_ETIME 10
533 /* Async Event timer multiplier */
534 #define XFRM_AE_ETH_M 10
535 /* default seq threshold size */
536 #define XFRM_AE_SEQT_SIZE 2
540 struct list_head list;
542 int (*notify)(struct xfrm_state *x, struct km_event *c);
543 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
544 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
545 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
546 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
547 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
548 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
551 extern int xfrm_register_km(struct xfrm_mgr *km);
552 extern int xfrm_unregister_km(struct xfrm_mgr *km);
554 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
557 * This structure is used for the duration where packets are being
558 * transformed by IPsec. As soon as the packet leaves IPsec the
559 * area beyond the generic IP part may be overwritten.
563 struct inet_skb_parm h4;
564 struct inet6_skb_parm h6;
567 /* Sequence number for replay protection. */
574 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
577 * This structure is used by the afinfo prepare_input/prepare_output functions
578 * to transmit header information to the mode input/output functions.
580 struct xfrm_mode_skb_cb {
582 struct inet_skb_parm h4;
583 struct inet6_skb_parm h6;
586 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
590 /* IP header length (excluding options or extension headers). */
593 /* TOS for IPv4, class for IPv6. */
596 /* TTL for IPv4, hop limitfor IPv6. */
599 /* Protocol for IPv4, NH for IPv6. */
602 /* Option length for IPv4, zero for IPv6. */
605 /* Used by IPv6 only, zero for IPv4. */
609 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
612 * This structure is used by the input processing to locate the SPI and
613 * related information.
615 struct xfrm_spi_skb_cb {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
621 unsigned int daddroff;
625 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
627 /* Audit Information */
635 #ifdef CONFIG_AUDITSYSCALL
636 static inline struct audit_buffer *xfrm_audit_start(const char *op)
638 struct audit_buffer *audit_buf = NULL;
640 if (audit_enabled == 0)
642 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
643 AUDIT_MAC_IPSEC_EVENT);
644 if (audit_buf == NULL)
646 audit_log_format(audit_buf, "op=%s", op);
650 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
651 struct audit_buffer *audit_buf)
656 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
658 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
659 audit_log_format(audit_buf, " subj=%s", secctx);
660 security_release_secctx(secctx, secctx_len);
662 audit_log_task_context(audit_buf);
665 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
666 u32 auid, u32 ses, u32 secid);
667 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
668 u32 auid, u32 ses, u32 secid);
669 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
670 u32 auid, u32 ses, u32 secid);
671 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
672 u32 auid, u32 ses, u32 secid);
673 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
674 struct sk_buff *skb);
675 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
676 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
677 __be32 net_spi, __be32 net_seq);
678 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
679 struct sk_buff *skb, u8 proto);
682 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
683 u32 auid, u32 ses, u32 secid)
687 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
688 u32 auid, u32 ses, u32 secid)
692 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
693 u32 auid, u32 ses, u32 secid)
697 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
698 u32 auid, u32 ses, u32 secid)
702 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
707 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
712 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq)
717 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
718 struct sk_buff *skb, u8 proto)
721 #endif /* CONFIG_AUDITSYSCALL */
723 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
725 if (likely(policy != NULL))
726 atomic_inc(&policy->refcnt);
729 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
731 static inline void xfrm_pol_put(struct xfrm_policy *policy)
733 if (atomic_dec_and_test(&policy->refcnt))
734 xfrm_policy_destroy(policy);
737 #ifdef CONFIG_XFRM_SUB_POLICY
738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
741 for (i = npols - 1; i >= 0; --i)
742 xfrm_pol_put(pols[i]);
745 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
747 xfrm_pol_put(pols[0]);
751 extern void __xfrm_state_destroy(struct xfrm_state *);
753 static inline void __xfrm_state_put(struct xfrm_state *x)
755 atomic_dec(&x->refcnt);
758 static inline void xfrm_state_put(struct xfrm_state *x)
760 if (atomic_dec_and_test(&x->refcnt))
761 __xfrm_state_destroy(x);
764 static inline void xfrm_state_hold(struct xfrm_state *x)
766 atomic_inc(&x->refcnt);
769 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
776 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
777 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
780 if (memcmp(a1, a2, pdw << 2))
786 mask = htonl((0xffffffff) << (32 - pbi));
788 if ((a1[pdw] ^ a2[pdw]) & mask)
796 __be16 xfrm_flowi_sport(struct flowi *fl)
802 case IPPROTO_UDPLITE:
804 port = fl->fl_ip_sport;
808 port = htons(fl->fl_icmp_type);
811 port = htons(fl->fl_mh_type);
820 __be16 xfrm_flowi_dport(struct flowi *fl)
826 case IPPROTO_UDPLITE:
828 port = fl->fl_ip_dport;
832 port = htons(fl->fl_icmp_code);
840 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
841 unsigned short family);
843 #ifdef CONFIG_SECURITY_NETWORK_XFRM
844 /* If neither has a context --> match
845 * Otherwise, both must have a context and the sids, doi, alg must match
847 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
849 return ((!s1 && !s2) ||
851 (s1->ctx_sid == s2->ctx_sid) &&
852 (s1->ctx_doi == s2->ctx_doi) &&
853 (s1->ctx_alg == s2->ctx_alg)));
856 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
862 /* A struct encoding bundle of transformations to apply to some set of flow.
864 * dst->child points to the next element of bundle.
865 * dst->xfrm points to an instanse of transformer.
867 * Due to unfortunate limitations of current routing cache, which we
868 * have no time to fix, it mirrors struct rtable and bound to the same
869 * routing key, including saddr,daddr. However, we can have many of
870 * bundles differing by session id. All the bundles grow from a parent
876 struct dst_entry dst;
880 struct dst_entry *route;
881 #ifdef CONFIG_XFRM_SUB_POLICY
882 struct flowi *origin;
883 struct xfrm_selector *partner;
886 u32 route_mtu_cached;
887 u32 child_mtu_cached;
893 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
895 dst_release(xdst->route);
896 if (likely(xdst->u.dst.xfrm))
897 xfrm_state_put(xdst->u.dst.xfrm);
898 #ifdef CONFIG_XFRM_SUB_POLICY
901 kfree(xdst->partner);
902 xdst->partner = NULL;
907 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
913 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
916 static inline struct sec_path *
917 secpath_get(struct sec_path *sp)
920 atomic_inc(&sp->refcnt);
924 extern void __secpath_destroy(struct sec_path *sp);
927 secpath_put(struct sec_path *sp)
929 if (sp && atomic_dec_and_test(&sp->refcnt))
930 __secpath_destroy(sp);
933 extern struct sec_path *secpath_dup(struct sec_path *src);
936 secpath_reset(struct sk_buff *skb)
939 secpath_put(skb->sp);
945 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
949 return addr->a4 == 0;
951 return ipv6_addr_any((struct in6_addr *)&addr->a6);
957 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
959 return (tmpl->saddr.a4 &&
960 tmpl->saddr.a4 != x->props.saddr.a4);
964 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
966 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
967 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
971 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
975 return __xfrm4_state_addr_cmp(tmpl, x);
977 return __xfrm6_state_addr_cmp(tmpl, x);
983 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
985 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
987 unsigned int family, int reverse)
989 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
991 if (sk && sk->sk_policy[XFRM_POLICY_IN])
992 return __xfrm_policy_check(sk, ndir, skb, family);
994 return (!xfrm_policy_count[dir] && !skb->sp) ||
995 (skb->dst->flags & DST_NOPOLICY) ||
996 __xfrm_policy_check(sk, ndir, skb, family);
999 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1001 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1004 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1006 return xfrm_policy_check(sk, dir, skb, AF_INET);
1009 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1011 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1014 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1015 struct sk_buff *skb)
1017 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1020 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1021 struct sk_buff *skb)
1023 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1026 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1027 unsigned int family, int reverse);
1029 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1030 unsigned int family)
1032 return __xfrm_decode_session(skb, fl, family, 0);
1035 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1037 unsigned int family)
1039 return __xfrm_decode_session(skb, fl, family, 1);
1042 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1044 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1046 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1047 (skb->dst->flags & DST_NOXFRM) ||
1048 __xfrm_route_forward(skb, family);
1051 static inline int xfrm4_route_forward(struct sk_buff *skb)
1053 return xfrm_route_forward(skb, AF_INET);
1056 static inline int xfrm6_route_forward(struct sk_buff *skb)
1058 return xfrm_route_forward(skb, AF_INET6);
1061 extern int __xfrm_sk_clone_policy(struct sock *sk);
1063 static inline int xfrm_sk_clone_policy(struct sock *sk)
1065 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1066 return __xfrm_sk_clone_policy(sk);
1070 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1072 static inline void xfrm_sk_free_policy(struct sock *sk)
1074 if (unlikely(sk->sk_policy[0] != NULL)) {
1075 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1076 sk->sk_policy[0] = NULL;
1078 if (unlikely(sk->sk_policy[1] != NULL)) {
1079 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1080 sk->sk_policy[1] = NULL;
1086 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1087 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1088 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1089 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1094 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1098 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1104 unsigned int family)
1108 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1109 struct sk_buff *skb)
1113 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1114 struct sk_buff *skb)
1121 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1125 return (xfrm_address_t *)&fl->fl4_dst;
1127 return (xfrm_address_t *)&fl->fl6_dst;
1133 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1137 return (xfrm_address_t *)&fl->fl4_src;
1139 return (xfrm_address_t *)&fl->fl6_src;
1145 void xfrm_flowi_addr_get(struct flowi *fl,
1146 xfrm_address_t *saddr, xfrm_address_t *daddr,
1147 unsigned short family)
1151 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1152 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1155 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1156 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1161 static __inline__ int
1162 __xfrm4_state_addr_check(struct xfrm_state *x,
1163 xfrm_address_t *daddr, xfrm_address_t *saddr)
1165 if (daddr->a4 == x->id.daddr.a4 &&
1166 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1171 static __inline__ int
1172 __xfrm6_state_addr_check(struct xfrm_state *x,
1173 xfrm_address_t *daddr, xfrm_address_t *saddr)
1175 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1176 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1177 ipv6_addr_any((struct in6_addr *)saddr) ||
1178 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1183 static __inline__ int
1184 xfrm_state_addr_check(struct xfrm_state *x,
1185 xfrm_address_t *daddr, xfrm_address_t *saddr,
1186 unsigned short family)
1190 return __xfrm4_state_addr_check(x, daddr, saddr);
1192 return __xfrm6_state_addr_check(x, daddr, saddr);
1197 static __inline__ int
1198 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1199 unsigned short family)
1203 return __xfrm4_state_addr_check(x,
1204 (xfrm_address_t *)&fl->fl4_dst,
1205 (xfrm_address_t *)&fl->fl4_src);
1207 return __xfrm6_state_addr_check(x,
1208 (xfrm_address_t *)&fl->fl6_dst,
1209 (xfrm_address_t *)&fl->fl6_src);
1214 static inline int xfrm_state_kern(struct xfrm_state *x)
1216 return atomic_read(&x->tunnel_users);
1219 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1221 return (!userproto || proto == userproto ||
1222 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1223 proto == IPPROTO_ESP ||
1224 proto == IPPROTO_COMP)));
1228 * xfrm algorithm information
1230 struct xfrm_algo_aead_info {
1234 struct xfrm_algo_auth_info {
1239 struct xfrm_algo_encr_info {
1244 struct xfrm_algo_comp_info {
1248 struct xfrm_algo_desc {
1253 struct xfrm_algo_aead_info aead;
1254 struct xfrm_algo_auth_info auth;
1255 struct xfrm_algo_encr_info encr;
1256 struct xfrm_algo_comp_info comp;
1258 struct sadb_alg desc;
1261 /* XFRM tunnel handlers. */
1262 struct xfrm_tunnel {
1263 int (*handler)(struct sk_buff *skb);
1264 int (*err_handler)(struct sk_buff *skb, __u32 info);
1266 struct xfrm_tunnel *next;
1270 struct xfrm6_tunnel {
1271 int (*handler)(struct sk_buff *skb);
1272 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1273 int type, int code, int offset, __be32 info);
1274 struct xfrm6_tunnel *next;
1278 extern void xfrm_init(void);
1279 extern void xfrm4_init(void);
1280 extern int xfrm_state_init(struct net *net);
1281 extern void xfrm_state_fini(struct net *net);
1282 extern void xfrm4_state_init(void);
1284 extern int xfrm6_init(void);
1285 extern void xfrm6_fini(void);
1286 extern int xfrm6_state_init(void);
1287 extern void xfrm6_state_fini(void);
1289 static inline int xfrm6_init(void)
1293 static inline void xfrm6_fini(void)
1299 #ifdef CONFIG_XFRM_STATISTICS
1300 extern int xfrm_proc_init(void);
1303 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1304 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1305 int (*func)(struct xfrm_state *, int, void*), void *);
1306 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1307 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1308 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1309 struct flowi *fl, struct xfrm_tmpl *tmpl,
1310 struct xfrm_policy *pol, int *err,
1311 unsigned short family);
1312 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1313 xfrm_address_t *saddr,
1314 unsigned short family,
1315 u8 mode, u8 proto, u32 reqid);
1316 extern int xfrm_state_check_expire(struct xfrm_state *x);
1317 extern void xfrm_state_insert(struct xfrm_state *x);
1318 extern int xfrm_state_add(struct xfrm_state *x);
1319 extern int xfrm_state_update(struct xfrm_state *x);
1320 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1321 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1322 #ifdef CONFIG_XFRM_SUB_POLICY
1323 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1324 int n, unsigned short family);
1325 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1326 int n, unsigned short family);
1328 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1329 int n, unsigned short family)
1334 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335 int n, unsigned short family)
1341 struct xfrmk_sadinfo {
1342 u32 sadhcnt; /* current hash bkts */
1343 u32 sadhmcnt; /* max allowed hash bkts */
1344 u32 sadcnt; /* current running count */
1347 struct xfrmk_spdinfo {
1358 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1359 extern int xfrm_state_delete(struct xfrm_state *x);
1360 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1361 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1362 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1363 extern int xfrm_replay_check(struct xfrm_state *x,
1364 struct sk_buff *skb, __be32 seq);
1365 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1366 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1367 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1368 extern int xfrm_init_state(struct xfrm_state *x);
1369 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1370 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1372 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1373 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1374 extern int xfrm_output(struct sk_buff *skb);
1375 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1376 extern int xfrm4_extract_header(struct sk_buff *skb);
1377 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1378 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1380 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1381 extern int xfrm4_rcv(struct sk_buff *skb);
1383 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1385 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1388 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1390 extern int xfrm4_output(struct sk_buff *skb);
1391 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1392 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1393 extern int xfrm6_extract_header(struct sk_buff *skb);
1394 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1396 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1397 extern int xfrm6_rcv(struct sk_buff *skb);
1398 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1399 xfrm_address_t *saddr, u8 proto);
1400 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1401 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1402 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1403 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1404 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1405 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1406 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1407 extern int xfrm6_output(struct sk_buff *skb);
1408 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1412 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1413 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1415 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1417 return -ENOPROTOOPT;
1420 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1422 /* should not happen */
1428 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1430 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1431 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1432 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1433 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1434 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1435 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1436 struct xfrm_selector *sel,
1437 struct xfrm_sec_ctx *ctx, int delete,
1439 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1440 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1441 u32 xfrm_get_acqseq(void);
1442 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1443 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1444 xfrm_address_t *daddr, xfrm_address_t *saddr,
1445 int create, unsigned short family);
1446 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1447 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1448 struct flowi *fl, int family, int strict);
1450 #ifdef CONFIG_XFRM_MIGRATE
1451 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1452 struct xfrm_migrate *m, int num_bundles,
1453 struct xfrm_kmaddress *k);
1454 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1455 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1456 struct xfrm_migrate *m);
1457 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles,
1459 struct xfrm_kmaddress *k);
1462 extern wait_queue_head_t km_waitq;
1463 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1464 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1465 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1467 extern void xfrm_input_init(void);
1468 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1470 extern void xfrm_probe_algs(void);
1471 extern int xfrm_count_auth_supported(void);
1472 extern int xfrm_count_enc_supported(void);
1473 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1474 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1475 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1476 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1477 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1478 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1479 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1480 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1481 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1486 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1489 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1490 int offset, int len, icv_update_fn_t icv_update);
1492 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1498 return (__force __u32)a->a4 - (__force __u32)b->a4;
1500 return ipv6_addr_cmp((struct in6_addr *)a,
1501 (struct in6_addr *)b);
1505 static inline int xfrm_policy_id2dir(u32 index)
1510 static inline int xfrm_aevent_is_on(void)
1516 nlsk = rcu_dereference(xfrm_nl);
1518 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1523 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1525 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1528 #ifdef CONFIG_XFRM_MIGRATE
1529 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1531 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1534 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1537 for (i = 0; i < n; i++)
1538 xfrm_state_put(*(states + i));
1541 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1544 for (i = 0; i < n; i++)
1545 xfrm_state_delete(*(states + i));
1550 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1552 return skb->sp->xvec[skb->sp->len - 1];
1556 #endif /* _NET_XFRM_H */