4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
19 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
57 extern struct mutex xfrm_cfg_mutex;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 /* Note: bydst is re-used during gc */
124 struct list_head all;
125 struct hlist_node bydst;
126 struct hlist_node bysrc;
127 struct hlist_node byspi;
133 struct xfrm_selector sel;
137 /* Key manger bits */
144 /* Parameters of this state. */
149 u8 aalgo, ealgo, calgo;
152 xfrm_address_t saddr;
157 struct xfrm_lifetime_cfg lft;
159 /* Data for transformer */
160 struct xfrm_algo *aalg;
161 struct xfrm_algo *ealg;
162 struct xfrm_algo *calg;
163 struct xfrm_algo_aead *aead;
165 /* Data for encapsulator */
166 struct xfrm_encap_tmpl *encap;
168 /* Data for care-of address */
169 xfrm_address_t *coaddr;
171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
172 struct xfrm_state *tunnel;
174 /* If a tunnel, number of users + 1 */
175 atomic_t tunnel_users;
177 /* State for replay detection */
178 struct xfrm_replay_state replay;
180 /* Replay detection state at the time we sent the last notification */
181 struct xfrm_replay_state preplay;
183 /* internal flag that only holds state for delayed aevent at the
188 /* Replay detection notification settings */
192 /* Replay detection notification timer */
193 struct timer_list rtimer;
196 struct xfrm_stats stats;
198 struct xfrm_lifetime_cur curlft;
199 struct timer_list timer;
202 unsigned long lastused;
204 /* Reference to data common to all the instances of this
206 const struct xfrm_type *type;
207 struct xfrm_mode *inner_mode;
208 struct xfrm_mode *inner_mode_iaf;
209 struct xfrm_mode *outer_mode;
211 /* Security context */
212 struct xfrm_sec_ctx *security;
214 /* Private data of this transformer, format is opaque,
215 * interpreted by xfrm_type methods. */
219 /* xflags - make enum if more show up */
220 #define XFRM_TIME_DEFER 1
231 /* callback structure passed from either netlink or pfkey */
250 struct xfrm_policy_afinfo {
251 unsigned short family;
252 struct dst_ops *dst_ops;
253 void (*garbage_collect)(void);
254 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
255 xfrm_address_t *daddr);
256 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
257 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
258 void (*decode_session)(struct sk_buff *skb,
261 int (*get_tos)(struct flowi *fl);
262 int (*init_path)(struct xfrm_dst *path,
263 struct dst_entry *dst,
265 int (*fill_dst)(struct xfrm_dst *xdst,
266 struct net_device *dev);
269 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
270 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
271 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
272 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
275 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
276 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
277 extern int __xfrm_state_delete(struct xfrm_state *x);
279 struct xfrm_state_afinfo {
283 struct module *owner;
284 const struct xfrm_type *type_map[IPPROTO_MAX];
285 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
286 int (*init_flags)(struct xfrm_state *x);
287 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
288 struct xfrm_tmpl *tmpl,
289 xfrm_address_t *daddr, xfrm_address_t *saddr);
290 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
291 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
292 int (*output)(struct sk_buff *skb);
293 int (*extract_input)(struct xfrm_state *x,
294 struct sk_buff *skb);
295 int (*extract_output)(struct xfrm_state *x,
296 struct sk_buff *skb);
297 int (*transport_finish)(struct sk_buff *skb,
301 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
302 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
304 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
309 struct module *owner;
312 #define XFRM_TYPE_NON_FRAGMENT 1
313 #define XFRM_TYPE_REPLAY_PROT 2
314 #define XFRM_TYPE_LOCAL_COADDR 4
315 #define XFRM_TYPE_REMOTE_COADDR 8
317 int (*init_state)(struct xfrm_state *x);
318 void (*destructor)(struct xfrm_state *);
319 int (*input)(struct xfrm_state *, struct sk_buff *skb);
320 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
321 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
322 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
323 /* Estimate maximal size of result of transformation of a dgram */
324 u32 (*get_mtu)(struct xfrm_state *, int size);
327 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
328 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
332 * Remove encapsulation header.
334 * The IP header will be moved over the top of the encapsulation
337 * On entry, the transport header shall point to where the IP header
338 * should be and the network header shall be set to where the IP
339 * header currently is. skb->data shall point to the start of the
342 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
345 * This is the actual input entry point.
347 * For transport mode and equivalent this would be identical to
348 * input2 (which does not need to be set). While tunnel mode
349 * and equivalent would set this to the tunnel encapsulation function
350 * xfrm4_prepare_input that would in turn call input2.
352 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
355 * Add encapsulation header.
357 * On exit, the transport header will be set to the start of the
358 * encapsulation header to be filled in by x->type->output and
359 * the mac header will be set to the nextheader (protocol for
360 * IPv4) field of the extension header directly preceding the
361 * encapsulation header, or in its absence, that of the top IP
362 * header. The value of the network header will always point
363 * to the top IP header while skb->data will point to the payload.
365 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
368 * This is the actual output entry point.
370 * For transport mode and equivalent this would be identical to
371 * output2 (which does not need to be set). While tunnel mode
372 * and equivalent would set this to a tunnel encapsulation function
373 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
376 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
378 struct xfrm_state_afinfo *afinfo;
379 struct module *owner;
384 /* Flags for xfrm_mode. */
386 XFRM_MODE_FLAG_TUNNEL = 1,
389 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
390 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
392 static inline int xfrm_af2proto(unsigned int family)
404 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
406 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
407 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
408 return x->inner_mode;
410 return x->inner_mode_iaf;
415 /* id in template is interpreted as:
416 * daddr - destination of tunnel, may be zero for transport mode.
417 * spi - zero to acquire spi. Not zero if spi is static, then
418 * daddr must be fixed too.
419 * proto - AH/ESP/IPCOMP
423 /* Source address of tunnel. Ignored, if it is not a tunnel. */
424 xfrm_address_t saddr;
426 unsigned short encap_family;
430 /* Mode: transport, tunnel etc. */
433 /* Sharing mode: unique, this session only, this user only etc. */
436 /* May skip this transfomration if no SA is found */
439 /* Skip aalgos/ealgos/calgos checks. */
442 /* Bit mask of algos allowed for acquisition */
448 #define XFRM_MAX_DEPTH 6
452 struct xfrm_policy *next;
453 struct list_head bytype;
454 struct hlist_node bydst;
455 struct hlist_node byidx;
457 /* This lock only affects elements except for entry. */
460 struct timer_list timer;
464 struct xfrm_selector selector;
465 struct xfrm_lifetime_cfg lft;
466 struct xfrm_lifetime_cur curlft;
467 struct dst_entry *bundles;
474 /* XXX 1 byte hole, try to pack */
475 struct xfrm_sec_ctx *security;
476 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
479 struct xfrm_migrate {
480 xfrm_address_t old_daddr;
481 xfrm_address_t old_saddr;
482 xfrm_address_t new_daddr;
483 xfrm_address_t new_saddr;
492 #define XFRM_KM_TIMEOUT 30
494 #define XFRM_REPLAY_SEQ 1
495 #define XFRM_REPLAY_OSEQ 2
496 #define XFRM_REPLAY_SEQ_MASK 3
498 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
499 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
501 /* default aevent timeout in units of 100ms */
502 #define XFRM_AE_ETIME 10
503 /* Async Event timer multiplier */
504 #define XFRM_AE_ETH_M 10
505 /* default seq threshold size */
506 #define XFRM_AE_SEQT_SIZE 2
510 struct list_head list;
512 int (*notify)(struct xfrm_state *x, struct km_event *c);
513 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
514 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
515 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
516 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
517 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
518 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
521 extern int xfrm_register_km(struct xfrm_mgr *km);
522 extern int xfrm_unregister_km(struct xfrm_mgr *km);
524 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
527 * This structure is used for the duration where packets are being
528 * transformed by IPsec. As soon as the packet leaves IPsec the
529 * area beyond the generic IP part may be overwritten.
533 struct inet_skb_parm h4;
534 struct inet6_skb_parm h6;
537 /* Sequence number for replay protection. */
544 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
547 * This structure is used by the afinfo prepare_input/prepare_output functions
548 * to transmit header information to the mode input/output functions.
550 struct xfrm_mode_skb_cb {
552 struct inet_skb_parm h4;
553 struct inet6_skb_parm h6;
556 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
560 /* IP header length (excluding options or extension headers). */
563 /* TOS for IPv4, class for IPv6. */
566 /* TTL for IPv4, hop limitfor IPv6. */
569 /* Protocol for IPv4, NH for IPv6. */
572 /* Option length for IPv4, zero for IPv6. */
575 /* Used by IPv6 only, zero for IPv4. */
579 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
582 * This structure is used by the input processing to locate the SPI and
583 * related information.
585 struct xfrm_spi_skb_cb {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
591 unsigned int daddroff;
595 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
597 /* Audit Information */
605 #ifdef CONFIG_AUDITSYSCALL
606 static inline struct audit_buffer *xfrm_audit_start(const char *op)
608 struct audit_buffer *audit_buf = NULL;
610 if (audit_enabled == 0)
612 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
613 AUDIT_MAC_IPSEC_EVENT);
614 if (audit_buf == NULL)
616 audit_log_format(audit_buf, "op=%s", op);
620 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
621 struct audit_buffer *audit_buf)
626 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
628 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
629 audit_log_format(audit_buf, " subj=%s", secctx);
630 security_release_secctx(secctx, secctx_len);
632 audit_log_task_context(audit_buf);
635 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
636 u32 auid, u32 ses, u32 secid);
637 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
638 u32 auid, u32 ses, u32 secid);
639 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
640 u32 auid, u32 ses, u32 secid);
641 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
642 u32 auid, u32 ses, u32 secid);
643 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
644 struct sk_buff *skb);
645 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
646 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
647 __be32 net_spi, __be32 net_seq);
648 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
649 struct sk_buff *skb, u8 proto);
651 #define xfrm_audit_policy_add(x, r, a, se, s) do { ; } while (0)
652 #define xfrm_audit_policy_delete(x, r, a, se, s) do { ; } while (0)
653 #define xfrm_audit_state_add(x, r, a, se, s) do { ; } while (0)
654 #define xfrm_audit_state_delete(x, r, a, se, s) do { ; } while (0)
655 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
656 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
657 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
658 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
659 #endif /* CONFIG_AUDITSYSCALL */
661 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
663 if (likely(policy != NULL))
664 atomic_inc(&policy->refcnt);
667 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
669 static inline void xfrm_pol_put(struct xfrm_policy *policy)
671 if (atomic_dec_and_test(&policy->refcnt))
672 xfrm_policy_destroy(policy);
675 #ifdef CONFIG_XFRM_SUB_POLICY
676 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
679 for (i = npols - 1; i >= 0; --i)
680 xfrm_pol_put(pols[i]);
683 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
685 xfrm_pol_put(pols[0]);
689 extern void __xfrm_state_destroy(struct xfrm_state *);
691 static inline void __xfrm_state_put(struct xfrm_state *x)
693 atomic_dec(&x->refcnt);
696 static inline void xfrm_state_put(struct xfrm_state *x)
698 if (atomic_dec_and_test(&x->refcnt))
699 __xfrm_state_destroy(x);
702 static inline void xfrm_state_hold(struct xfrm_state *x)
704 atomic_inc(&x->refcnt);
707 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
714 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
715 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
718 if (memcmp(a1, a2, pdw << 2))
724 mask = htonl((0xffffffff) << (32 - pbi));
726 if ((a1[pdw] ^ a2[pdw]) & mask)
734 __be16 xfrm_flowi_sport(struct flowi *fl)
740 case IPPROTO_UDPLITE:
742 port = fl->fl_ip_sport;
746 port = htons(fl->fl_icmp_type);
749 port = htons(fl->fl_mh_type);
758 __be16 xfrm_flowi_dport(struct flowi *fl)
764 case IPPROTO_UDPLITE:
766 port = fl->fl_ip_dport;
770 port = htons(fl->fl_icmp_code);
778 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
779 unsigned short family);
781 #ifdef CONFIG_SECURITY_NETWORK_XFRM
782 /* If neither has a context --> match
783 * Otherwise, both must have a context and the sids, doi, alg must match
785 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
787 return ((!s1 && !s2) ||
789 (s1->ctx_sid == s2->ctx_sid) &&
790 (s1->ctx_doi == s2->ctx_doi) &&
791 (s1->ctx_alg == s2->ctx_alg)));
794 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
800 /* A struct encoding bundle of transformations to apply to some set of flow.
802 * dst->child points to the next element of bundle.
803 * dst->xfrm points to an instanse of transformer.
805 * Due to unfortunate limitations of current routing cache, which we
806 * have no time to fix, it mirrors struct rtable and bound to the same
807 * routing key, including saddr,daddr. However, we can have many of
808 * bundles differing by session id. All the bundles grow from a parent
814 struct dst_entry dst;
818 struct dst_entry *route;
819 #ifdef CONFIG_XFRM_SUB_POLICY
820 struct flowi *origin;
821 struct xfrm_selector *partner;
824 u32 route_mtu_cached;
825 u32 child_mtu_cached;
830 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
832 dst_release(xdst->route);
833 if (likely(xdst->u.dst.xfrm))
834 xfrm_state_put(xdst->u.dst.xfrm);
835 #ifdef CONFIG_XFRM_SUB_POLICY
838 kfree(xdst->partner);
839 xdst->partner = NULL;
843 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
849 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
852 static inline struct sec_path *
853 secpath_get(struct sec_path *sp)
856 atomic_inc(&sp->refcnt);
860 extern void __secpath_destroy(struct sec_path *sp);
863 secpath_put(struct sec_path *sp)
865 if (sp && atomic_dec_and_test(&sp->refcnt))
866 __secpath_destroy(sp);
869 extern struct sec_path *secpath_dup(struct sec_path *src);
872 secpath_reset(struct sk_buff *skb)
875 secpath_put(skb->sp);
881 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
885 return addr->a4 == 0;
887 return ipv6_addr_any((struct in6_addr *)&addr->a6);
893 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
895 return (tmpl->saddr.a4 &&
896 tmpl->saddr.a4 != x->props.saddr.a4);
900 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
902 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
903 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
907 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
911 return __xfrm4_state_addr_cmp(tmpl, x);
913 return __xfrm6_state_addr_cmp(tmpl, x);
919 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
921 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
923 unsigned int family, int reverse)
925 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
927 if (sk && sk->sk_policy[XFRM_POLICY_IN])
928 return __xfrm_policy_check(sk, ndir, skb, family);
930 return (!xfrm_policy_count[dir] && !skb->sp) ||
931 (skb->dst->flags & DST_NOPOLICY) ||
932 __xfrm_policy_check(sk, ndir, skb, family);
935 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
937 return __xfrm_policy_check2(sk, dir, skb, family, 0);
940 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
942 return xfrm_policy_check(sk, dir, skb, AF_INET);
945 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
947 return xfrm_policy_check(sk, dir, skb, AF_INET6);
950 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
953 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
956 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
959 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
962 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
963 unsigned int family, int reverse);
965 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
968 return __xfrm_decode_session(skb, fl, family, 0);
971 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
975 return __xfrm_decode_session(skb, fl, family, 1);
978 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
980 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
982 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
983 (skb->dst->flags & DST_NOXFRM) ||
984 __xfrm_route_forward(skb, family);
987 static inline int xfrm4_route_forward(struct sk_buff *skb)
989 return xfrm_route_forward(skb, AF_INET);
992 static inline int xfrm6_route_forward(struct sk_buff *skb)
994 return xfrm_route_forward(skb, AF_INET6);
997 extern int __xfrm_sk_clone_policy(struct sock *sk);
999 static inline int xfrm_sk_clone_policy(struct sock *sk)
1001 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1002 return __xfrm_sk_clone_policy(sk);
1006 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1008 static inline void xfrm_sk_free_policy(struct sock *sk)
1010 if (unlikely(sk->sk_policy[0] != NULL)) {
1011 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1012 sk->sk_policy[0] = NULL;
1014 if (unlikely(sk->sk_policy[1] != NULL)) {
1015 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1016 sk->sk_policy[1] = NULL;
1022 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1023 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1024 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1025 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1026 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1030 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1034 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1038 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1040 unsigned int family)
1044 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1045 struct sk_buff *skb)
1049 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1050 struct sk_buff *skb)
1057 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1061 return (xfrm_address_t *)&fl->fl4_dst;
1063 return (xfrm_address_t *)&fl->fl6_dst;
1069 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1073 return (xfrm_address_t *)&fl->fl4_src;
1075 return (xfrm_address_t *)&fl->fl6_src;
1081 void xfrm_flowi_addr_get(struct flowi *fl,
1082 xfrm_address_t *saddr, xfrm_address_t *daddr,
1083 unsigned short family)
1087 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1088 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1091 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1092 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1097 static __inline__ int
1098 __xfrm4_state_addr_check(struct xfrm_state *x,
1099 xfrm_address_t *daddr, xfrm_address_t *saddr)
1101 if (daddr->a4 == x->id.daddr.a4 &&
1102 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1107 static __inline__ int
1108 __xfrm6_state_addr_check(struct xfrm_state *x,
1109 xfrm_address_t *daddr, xfrm_address_t *saddr)
1111 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1112 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1113 ipv6_addr_any((struct in6_addr *)saddr) ||
1114 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1119 static __inline__ int
1120 xfrm_state_addr_check(struct xfrm_state *x,
1121 xfrm_address_t *daddr, xfrm_address_t *saddr,
1122 unsigned short family)
1126 return __xfrm4_state_addr_check(x, daddr, saddr);
1128 return __xfrm6_state_addr_check(x, daddr, saddr);
1133 static __inline__ int
1134 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1135 unsigned short family)
1139 return __xfrm4_state_addr_check(x,
1140 (xfrm_address_t *)&fl->fl4_dst,
1141 (xfrm_address_t *)&fl->fl4_src);
1143 return __xfrm6_state_addr_check(x,
1144 (xfrm_address_t *)&fl->fl6_dst,
1145 (xfrm_address_t *)&fl->fl6_src);
1150 static inline int xfrm_state_kern(struct xfrm_state *x)
1152 return atomic_read(&x->tunnel_users);
1155 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1157 return (!userproto || proto == userproto ||
1158 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1159 proto == IPPROTO_ESP ||
1160 proto == IPPROTO_COMP)));
1164 * xfrm algorithm information
1166 struct xfrm_algo_aead_info {
1170 struct xfrm_algo_auth_info {
1175 struct xfrm_algo_encr_info {
1180 struct xfrm_algo_comp_info {
1184 struct xfrm_algo_desc {
1189 struct xfrm_algo_aead_info aead;
1190 struct xfrm_algo_auth_info auth;
1191 struct xfrm_algo_encr_info encr;
1192 struct xfrm_algo_comp_info comp;
1194 struct sadb_alg desc;
1197 /* XFRM tunnel handlers. */
1198 struct xfrm_tunnel {
1199 int (*handler)(struct sk_buff *skb);
1200 int (*err_handler)(struct sk_buff *skb, __u32 info);
1202 struct xfrm_tunnel *next;
1206 struct xfrm6_tunnel {
1207 int (*handler)(struct sk_buff *skb);
1208 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1209 int type, int code, int offset, __be32 info);
1210 struct xfrm6_tunnel *next;
1214 struct xfrm_state_walk {
1215 struct xfrm_state *state;
1220 struct xfrm_policy_walk {
1221 struct xfrm_policy *policy;
1226 extern void xfrm_init(void);
1227 extern void xfrm4_init(void);
1228 extern void xfrm_state_init(void);
1229 extern void xfrm4_state_init(void);
1231 extern int xfrm6_init(void);
1232 extern void xfrm6_fini(void);
1233 extern int xfrm6_state_init(void);
1234 extern void xfrm6_state_fini(void);
1236 static inline int xfrm6_init(void)
1240 static inline void xfrm6_fini(void)
1246 #ifdef CONFIG_XFRM_STATISTICS
1247 extern int xfrm_proc_init(void);
1250 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1252 walk->proto = proto;
1257 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1259 if (walk->state != NULL) {
1260 xfrm_state_put(walk->state);
1265 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1266 int (*func)(struct xfrm_state *, int, void*), void *);
1267 extern struct xfrm_state *xfrm_state_alloc(void);
1268 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1269 struct flowi *fl, struct xfrm_tmpl *tmpl,
1270 struct xfrm_policy *pol, int *err,
1271 unsigned short family);
1272 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1273 xfrm_address_t *saddr,
1274 unsigned short family,
1275 u8 mode, u8 proto, u32 reqid);
1276 extern int xfrm_state_check_expire(struct xfrm_state *x);
1277 extern void xfrm_state_insert(struct xfrm_state *x);
1278 extern int xfrm_state_add(struct xfrm_state *x);
1279 extern int xfrm_state_update(struct xfrm_state *x);
1280 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1281 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1282 #ifdef CONFIG_XFRM_SUB_POLICY
1283 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1284 int n, unsigned short family);
1285 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1286 int n, unsigned short family);
1288 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1289 int n, unsigned short family)
1294 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1295 int n, unsigned short family)
1301 struct xfrmk_sadinfo {
1302 u32 sadhcnt; /* current hash bkts */
1303 u32 sadhmcnt; /* max allowed hash bkts */
1304 u32 sadcnt; /* current running count */
1307 struct xfrmk_spdinfo {
1318 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1319 extern int xfrm_state_delete(struct xfrm_state *x);
1320 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1321 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1322 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1323 extern int xfrm_replay_check(struct xfrm_state *x,
1324 struct sk_buff *skb, __be32 seq);
1325 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1326 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1327 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1328 extern int xfrm_init_state(struct xfrm_state *x);
1329 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1330 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1332 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1333 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1334 extern int xfrm_output(struct sk_buff *skb);
1335 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1336 extern int xfrm4_extract_header(struct sk_buff *skb);
1337 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1338 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1340 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1341 extern int xfrm4_rcv(struct sk_buff *skb);
1343 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1345 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1348 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1349 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1350 extern int xfrm4_output(struct sk_buff *skb);
1351 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1352 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1353 extern int xfrm6_extract_header(struct sk_buff *skb);
1354 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1355 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1356 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1357 extern int xfrm6_rcv(struct sk_buff *skb);
1358 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1359 xfrm_address_t *saddr, u8 proto);
1360 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1361 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1362 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1363 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1364 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1365 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1366 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1367 extern int xfrm6_output(struct sk_buff *skb);
1368 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1372 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1373 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1375 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1377 return -ENOPROTOOPT;
1380 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1382 /* should not happen */
1388 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1390 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1392 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1394 walk->policy = NULL;
1398 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1400 if (walk->policy != NULL) {
1401 xfrm_pol_put(walk->policy);
1402 walk->policy = NULL;
1406 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1407 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1408 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1409 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1410 struct xfrm_selector *sel,
1411 struct xfrm_sec_ctx *ctx, int delete,
1413 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1414 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1415 u32 xfrm_get_acqseq(void);
1416 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1417 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1418 xfrm_address_t *daddr, xfrm_address_t *saddr,
1419 int create, unsigned short family);
1420 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1421 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1422 struct flowi *fl, int family, int strict);
1424 #ifdef CONFIG_XFRM_MIGRATE
1425 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1426 struct xfrm_migrate *m, int num_bundles);
1427 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1428 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1429 struct xfrm_migrate *m);
1430 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1431 struct xfrm_migrate *m, int num_bundles);
1434 extern wait_queue_head_t km_waitq;
1435 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1436 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1437 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1439 extern void xfrm_input_init(void);
1440 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1442 extern void xfrm_probe_algs(void);
1443 extern int xfrm_count_auth_supported(void);
1444 extern int xfrm_count_enc_supported(void);
1445 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1446 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1447 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1448 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1449 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1450 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1451 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1452 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1453 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1458 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1461 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1462 int offset, int len, icv_update_fn_t icv_update);
1464 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1470 return (__force __u32)a->a4 - (__force __u32)b->a4;
1472 return ipv6_addr_cmp((struct in6_addr *)a,
1473 (struct in6_addr *)b);
1477 static inline int xfrm_policy_id2dir(u32 index)
1482 static inline int xfrm_aevent_is_on(void)
1488 nlsk = rcu_dereference(xfrm_nl);
1490 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1495 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1497 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1500 #ifdef CONFIG_XFRM_MIGRATE
1501 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1503 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1506 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1509 for (i = 0; i < n; i++)
1510 xfrm_state_put(*(states + i));
1513 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1516 for (i = 0; i < n; i++)
1517 xfrm_state_delete(*(states + i));
1521 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1523 return skb->sp->xvec[skb->sp->len - 1];
1526 #endif /* _NET_XFRM_H */