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. */
134 struct hlist_node gclist;
135 struct hlist_node bydst;
137 struct hlist_node bysrc;
138 struct hlist_node byspi;
144 struct xfrm_selector sel;
148 /* Key manager bits */
149 struct xfrm_state_walk km;
151 /* Parameters of this state. */
156 u8 aalgo, ealgo, calgo;
159 xfrm_address_t saddr;
164 struct xfrm_lifetime_cfg lft;
166 /* Data for transformer */
167 struct xfrm_algo *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
172 /* Data for encapsulator */
173 struct xfrm_encap_tmpl *encap;
175 /* Data for care-of address */
176 xfrm_address_t *coaddr;
178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
179 struct xfrm_state *tunnel;
181 /* If a tunnel, number of users + 1 */
182 atomic_t tunnel_users;
184 /* State for replay detection */
185 struct xfrm_replay_state replay;
187 /* Replay detection state at the time we sent the last notification */
188 struct xfrm_replay_state preplay;
190 /* internal flag that only holds state for delayed aevent at the
195 /* Replay detection notification settings */
199 /* Replay detection notification timer */
200 struct timer_list rtimer;
203 struct xfrm_stats stats;
205 struct xfrm_lifetime_cur curlft;
206 struct timer_list timer;
209 unsigned long lastused;
211 /* Reference to data common to all the instances of this
213 const struct xfrm_type *type;
214 struct xfrm_mode *inner_mode;
215 struct xfrm_mode *inner_mode_iaf;
216 struct xfrm_mode *outer_mode;
218 /* Security context */
219 struct xfrm_sec_ctx *security;
221 /* Private data of this transformer, format is opaque,
222 * interpreted by xfrm_type methods. */
226 /* xflags - make enum if more show up */
227 #define XFRM_TIME_DEFER 1
238 /* callback structure passed from either netlink or pfkey */
257 struct xfrm_policy_afinfo {
258 unsigned short family;
259 struct dst_ops *dst_ops;
260 void (*garbage_collect)(void);
261 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
262 xfrm_address_t *daddr);
263 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
264 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
265 void (*decode_session)(struct sk_buff *skb,
268 int (*get_tos)(struct flowi *fl);
269 int (*init_path)(struct xfrm_dst *path,
270 struct dst_entry *dst,
272 int (*fill_dst)(struct xfrm_dst *xdst,
273 struct net_device *dev);
276 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
277 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
278 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
279 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
282 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
283 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
284 extern int __xfrm_state_delete(struct xfrm_state *x);
286 struct xfrm_state_afinfo {
290 struct module *owner;
291 const struct xfrm_type *type_map[IPPROTO_MAX];
292 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
293 int (*init_flags)(struct xfrm_state *x);
294 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
295 struct xfrm_tmpl *tmpl,
296 xfrm_address_t *daddr, xfrm_address_t *saddr);
297 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
298 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
299 int (*output)(struct sk_buff *skb);
300 int (*extract_input)(struct xfrm_state *x,
301 struct sk_buff *skb);
302 int (*extract_output)(struct xfrm_state *x,
303 struct sk_buff *skb);
304 int (*transport_finish)(struct sk_buff *skb,
308 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
309 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
311 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
316 struct module *owner;
319 #define XFRM_TYPE_NON_FRAGMENT 1
320 #define XFRM_TYPE_REPLAY_PROT 2
321 #define XFRM_TYPE_LOCAL_COADDR 4
322 #define XFRM_TYPE_REMOTE_COADDR 8
324 int (*init_state)(struct xfrm_state *x);
325 void (*destructor)(struct xfrm_state *);
326 int (*input)(struct xfrm_state *, struct sk_buff *skb);
327 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
328 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
329 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
330 /* Estimate maximal size of result of transformation of a dgram */
331 u32 (*get_mtu)(struct xfrm_state *, int size);
334 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
335 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
339 * Remove encapsulation header.
341 * The IP header will be moved over the top of the encapsulation
344 * On entry, the transport header shall point to where the IP header
345 * should be and the network header shall be set to where the IP
346 * header currently is. skb->data shall point to the start of the
349 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
352 * This is the actual input entry point.
354 * For transport mode and equivalent this would be identical to
355 * input2 (which does not need to be set). While tunnel mode
356 * and equivalent would set this to the tunnel encapsulation function
357 * xfrm4_prepare_input that would in turn call input2.
359 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
362 * Add encapsulation header.
364 * On exit, the transport header will be set to the start of the
365 * encapsulation header to be filled in by x->type->output and
366 * the mac header will be set to the nextheader (protocol for
367 * IPv4) field of the extension header directly preceding the
368 * encapsulation header, or in its absence, that of the top IP
369 * header. The value of the network header will always point
370 * to the top IP header while skb->data will point to the payload.
372 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
375 * This is the actual output entry point.
377 * For transport mode and equivalent this would be identical to
378 * output2 (which does not need to be set). While tunnel mode
379 * and equivalent would set this to a tunnel encapsulation function
380 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
383 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
385 struct xfrm_state_afinfo *afinfo;
386 struct module *owner;
391 /* Flags for xfrm_mode. */
393 XFRM_MODE_FLAG_TUNNEL = 1,
396 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
397 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
399 static inline int xfrm_af2proto(unsigned int family)
411 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
413 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
414 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
415 return x->inner_mode;
417 return x->inner_mode_iaf;
422 /* id in template is interpreted as:
423 * daddr - destination of tunnel, may be zero for transport mode.
424 * spi - zero to acquire spi. Not zero if spi is static, then
425 * daddr must be fixed too.
426 * proto - AH/ESP/IPCOMP
430 /* Source address of tunnel. Ignored, if it is not a tunnel. */
431 xfrm_address_t saddr;
433 unsigned short encap_family;
437 /* Mode: transport, tunnel etc. */
440 /* Sharing mode: unique, this session only, this user only etc. */
443 /* May skip this transfomration if no SA is found */
446 /* Skip aalgos/ealgos/calgos checks. */
449 /* Bit mask of algos allowed for acquisition */
455 #define XFRM_MAX_DEPTH 6
457 struct xfrm_policy_walk_entry {
458 struct list_head all;
462 struct xfrm_policy_walk {
463 struct xfrm_policy_walk_entry walk;
470 struct xfrm_policy *next;
471 struct hlist_node bydst;
472 struct hlist_node byidx;
474 /* This lock only affects elements except for entry. */
477 struct timer_list timer;
481 struct xfrm_selector selector;
482 struct xfrm_lifetime_cfg lft;
483 struct xfrm_lifetime_cur curlft;
484 struct dst_entry *bundles;
485 struct xfrm_policy_walk_entry walk;
491 struct xfrm_sec_ctx *security;
492 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
495 struct xfrm_kmaddress {
496 xfrm_address_t local;
497 xfrm_address_t remote;
502 struct xfrm_migrate {
503 xfrm_address_t old_daddr;
504 xfrm_address_t old_saddr;
505 xfrm_address_t new_daddr;
506 xfrm_address_t new_saddr;
515 #define XFRM_KM_TIMEOUT 30
517 #define XFRM_REPLAY_SEQ 1
518 #define XFRM_REPLAY_OSEQ 2
519 #define XFRM_REPLAY_SEQ_MASK 3
521 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
522 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
524 /* default aevent timeout in units of 100ms */
525 #define XFRM_AE_ETIME 10
526 /* Async Event timer multiplier */
527 #define XFRM_AE_ETH_M 10
528 /* default seq threshold size */
529 #define XFRM_AE_SEQT_SIZE 2
533 struct list_head list;
535 int (*notify)(struct xfrm_state *x, struct km_event *c);
536 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
537 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
538 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
539 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
540 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
541 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
544 extern int xfrm_register_km(struct xfrm_mgr *km);
545 extern int xfrm_unregister_km(struct xfrm_mgr *km);
547 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
550 * This structure is used for the duration where packets are being
551 * transformed by IPsec. As soon as the packet leaves IPsec the
552 * area beyond the generic IP part may be overwritten.
556 struct inet_skb_parm h4;
557 struct inet6_skb_parm h6;
560 /* Sequence number for replay protection. */
567 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
570 * This structure is used by the afinfo prepare_input/prepare_output functions
571 * to transmit header information to the mode input/output functions.
573 struct xfrm_mode_skb_cb {
575 struct inet_skb_parm h4;
576 struct inet6_skb_parm h6;
579 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
583 /* IP header length (excluding options or extension headers). */
586 /* TOS for IPv4, class for IPv6. */
589 /* TTL for IPv4, hop limitfor IPv6. */
592 /* Protocol for IPv4, NH for IPv6. */
595 /* Option length for IPv4, zero for IPv6. */
598 /* Used by IPv6 only, zero for IPv4. */
602 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
605 * This structure is used by the input processing to locate the SPI and
606 * related information.
608 struct xfrm_spi_skb_cb {
610 struct inet_skb_parm h4;
611 struct inet6_skb_parm h6;
614 unsigned int daddroff;
618 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
620 /* Audit Information */
628 #ifdef CONFIG_AUDITSYSCALL
629 static inline struct audit_buffer *xfrm_audit_start(const char *op)
631 struct audit_buffer *audit_buf = NULL;
633 if (audit_enabled == 0)
635 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
636 AUDIT_MAC_IPSEC_EVENT);
637 if (audit_buf == NULL)
639 audit_log_format(audit_buf, "op=%s", op);
643 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
644 struct audit_buffer *audit_buf)
649 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
651 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
652 audit_log_format(audit_buf, " subj=%s", secctx);
653 security_release_secctx(secctx, secctx_len);
655 audit_log_task_context(audit_buf);
658 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
659 u32 auid, u32 ses, u32 secid);
660 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
661 u32 auid, u32 ses, u32 secid);
662 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
663 u32 auid, u32 ses, u32 secid);
664 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
665 u32 auid, u32 ses, u32 secid);
666 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
667 struct sk_buff *skb);
668 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
669 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
670 __be32 net_spi, __be32 net_seq);
671 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
672 struct sk_buff *skb, u8 proto);
675 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
676 u32 auid, u32 ses, u32 secid)
680 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
681 u32 auid, u32 ses, u32 secid)
685 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
686 u32 auid, u32 ses, u32 secid)
690 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
691 u32 auid, u32 ses, u32 secid)
695 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
700 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
705 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
706 __be32 net_spi, __be32 net_seq)
710 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
711 struct sk_buff *skb, u8 proto)
714 #endif /* CONFIG_AUDITSYSCALL */
716 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
718 if (likely(policy != NULL))
719 atomic_inc(&policy->refcnt);
722 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
724 static inline void xfrm_pol_put(struct xfrm_policy *policy)
726 if (atomic_dec_and_test(&policy->refcnt))
727 xfrm_policy_destroy(policy);
730 #ifdef CONFIG_XFRM_SUB_POLICY
731 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
734 for (i = npols - 1; i >= 0; --i)
735 xfrm_pol_put(pols[i]);
738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
740 xfrm_pol_put(pols[0]);
744 extern void __xfrm_state_destroy(struct xfrm_state *);
746 static inline void __xfrm_state_put(struct xfrm_state *x)
748 atomic_dec(&x->refcnt);
751 static inline void xfrm_state_put(struct xfrm_state *x)
753 if (atomic_dec_and_test(&x->refcnt))
754 __xfrm_state_destroy(x);
757 static inline void xfrm_state_hold(struct xfrm_state *x)
759 atomic_inc(&x->refcnt);
762 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
769 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
770 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
773 if (memcmp(a1, a2, pdw << 2))
779 mask = htonl((0xffffffff) << (32 - pbi));
781 if ((a1[pdw] ^ a2[pdw]) & mask)
789 __be16 xfrm_flowi_sport(struct flowi *fl)
795 case IPPROTO_UDPLITE:
797 port = fl->fl_ip_sport;
801 port = htons(fl->fl_icmp_type);
804 port = htons(fl->fl_mh_type);
813 __be16 xfrm_flowi_dport(struct flowi *fl)
819 case IPPROTO_UDPLITE:
821 port = fl->fl_ip_dport;
825 port = htons(fl->fl_icmp_code);
833 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
834 unsigned short family);
836 #ifdef CONFIG_SECURITY_NETWORK_XFRM
837 /* If neither has a context --> match
838 * Otherwise, both must have a context and the sids, doi, alg must match
840 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
842 return ((!s1 && !s2) ||
844 (s1->ctx_sid == s2->ctx_sid) &&
845 (s1->ctx_doi == s2->ctx_doi) &&
846 (s1->ctx_alg == s2->ctx_alg)));
849 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
855 /* A struct encoding bundle of transformations to apply to some set of flow.
857 * dst->child points to the next element of bundle.
858 * dst->xfrm points to an instanse of transformer.
860 * Due to unfortunate limitations of current routing cache, which we
861 * have no time to fix, it mirrors struct rtable and bound to the same
862 * routing key, including saddr,daddr. However, we can have many of
863 * bundles differing by session id. All the bundles grow from a parent
869 struct dst_entry dst;
873 struct dst_entry *route;
874 #ifdef CONFIG_XFRM_SUB_POLICY
875 struct flowi *origin;
876 struct xfrm_selector *partner;
879 u32 route_mtu_cached;
880 u32 child_mtu_cached;
885 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
887 dst_release(xdst->route);
888 if (likely(xdst->u.dst.xfrm))
889 xfrm_state_put(xdst->u.dst.xfrm);
890 #ifdef CONFIG_XFRM_SUB_POLICY
893 kfree(xdst->partner);
894 xdst->partner = NULL;
898 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
904 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
907 static inline struct sec_path *
908 secpath_get(struct sec_path *sp)
911 atomic_inc(&sp->refcnt);
915 extern void __secpath_destroy(struct sec_path *sp);
918 secpath_put(struct sec_path *sp)
920 if (sp && atomic_dec_and_test(&sp->refcnt))
921 __secpath_destroy(sp);
924 extern struct sec_path *secpath_dup(struct sec_path *src);
927 secpath_reset(struct sk_buff *skb)
930 secpath_put(skb->sp);
936 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
940 return addr->a4 == 0;
942 return ipv6_addr_any((struct in6_addr *)&addr->a6);
948 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
950 return (tmpl->saddr.a4 &&
951 tmpl->saddr.a4 != x->props.saddr.a4);
955 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
957 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
958 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
962 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
966 return __xfrm4_state_addr_cmp(tmpl, x);
968 return __xfrm6_state_addr_cmp(tmpl, x);
974 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
976 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
978 unsigned int family, int reverse)
980 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
982 if (sk && sk->sk_policy[XFRM_POLICY_IN])
983 return __xfrm_policy_check(sk, ndir, skb, family);
985 return (!xfrm_policy_count[dir] && !skb->sp) ||
986 (skb->dst->flags & DST_NOPOLICY) ||
987 __xfrm_policy_check(sk, ndir, skb, family);
990 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
992 return __xfrm_policy_check2(sk, dir, skb, family, 0);
995 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
997 return xfrm_policy_check(sk, dir, skb, AF_INET);
1000 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1002 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1005 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1006 struct sk_buff *skb)
1008 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1011 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1012 struct sk_buff *skb)
1014 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1017 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1018 unsigned int family, int reverse);
1020 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1021 unsigned int family)
1023 return __xfrm_decode_session(skb, fl, family, 0);
1026 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1028 unsigned int family)
1030 return __xfrm_decode_session(skb, fl, family, 1);
1033 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1035 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1037 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1038 (skb->dst->flags & DST_NOXFRM) ||
1039 __xfrm_route_forward(skb, family);
1042 static inline int xfrm4_route_forward(struct sk_buff *skb)
1044 return xfrm_route_forward(skb, AF_INET);
1047 static inline int xfrm6_route_forward(struct sk_buff *skb)
1049 return xfrm_route_forward(skb, AF_INET6);
1052 extern int __xfrm_sk_clone_policy(struct sock *sk);
1054 static inline int xfrm_sk_clone_policy(struct sock *sk)
1056 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1057 return __xfrm_sk_clone_policy(sk);
1061 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1063 static inline void xfrm_sk_free_policy(struct sock *sk)
1065 if (unlikely(sk->sk_policy[0] != NULL)) {
1066 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1067 sk->sk_policy[0] = NULL;
1069 if (unlikely(sk->sk_policy[1] != NULL)) {
1070 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1071 sk->sk_policy[1] = NULL;
1077 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1078 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1079 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1080 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1081 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1085 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1093 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1095 unsigned int family)
1099 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1100 struct sk_buff *skb)
1104 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1105 struct sk_buff *skb)
1112 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1116 return (xfrm_address_t *)&fl->fl4_dst;
1118 return (xfrm_address_t *)&fl->fl6_dst;
1124 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1128 return (xfrm_address_t *)&fl->fl4_src;
1130 return (xfrm_address_t *)&fl->fl6_src;
1136 void xfrm_flowi_addr_get(struct flowi *fl,
1137 xfrm_address_t *saddr, xfrm_address_t *daddr,
1138 unsigned short family)
1142 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1143 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1146 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1147 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1152 static __inline__ int
1153 __xfrm4_state_addr_check(struct xfrm_state *x,
1154 xfrm_address_t *daddr, xfrm_address_t *saddr)
1156 if (daddr->a4 == x->id.daddr.a4 &&
1157 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1162 static __inline__ int
1163 __xfrm6_state_addr_check(struct xfrm_state *x,
1164 xfrm_address_t *daddr, xfrm_address_t *saddr)
1166 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1167 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1168 ipv6_addr_any((struct in6_addr *)saddr) ||
1169 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1174 static __inline__ int
1175 xfrm_state_addr_check(struct xfrm_state *x,
1176 xfrm_address_t *daddr, xfrm_address_t *saddr,
1177 unsigned short family)
1181 return __xfrm4_state_addr_check(x, daddr, saddr);
1183 return __xfrm6_state_addr_check(x, daddr, saddr);
1188 static __inline__ int
1189 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1190 unsigned short family)
1194 return __xfrm4_state_addr_check(x,
1195 (xfrm_address_t *)&fl->fl4_dst,
1196 (xfrm_address_t *)&fl->fl4_src);
1198 return __xfrm6_state_addr_check(x,
1199 (xfrm_address_t *)&fl->fl6_dst,
1200 (xfrm_address_t *)&fl->fl6_src);
1205 static inline int xfrm_state_kern(struct xfrm_state *x)
1207 return atomic_read(&x->tunnel_users);
1210 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1212 return (!userproto || proto == userproto ||
1213 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1214 proto == IPPROTO_ESP ||
1215 proto == IPPROTO_COMP)));
1219 * xfrm algorithm information
1221 struct xfrm_algo_aead_info {
1225 struct xfrm_algo_auth_info {
1230 struct xfrm_algo_encr_info {
1235 struct xfrm_algo_comp_info {
1239 struct xfrm_algo_desc {
1244 struct xfrm_algo_aead_info aead;
1245 struct xfrm_algo_auth_info auth;
1246 struct xfrm_algo_encr_info encr;
1247 struct xfrm_algo_comp_info comp;
1249 struct sadb_alg desc;
1252 /* XFRM tunnel handlers. */
1253 struct xfrm_tunnel {
1254 int (*handler)(struct sk_buff *skb);
1255 int (*err_handler)(struct sk_buff *skb, __u32 info);
1257 struct xfrm_tunnel *next;
1261 struct xfrm6_tunnel {
1262 int (*handler)(struct sk_buff *skb);
1263 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1264 int type, int code, int offset, __be32 info);
1265 struct xfrm6_tunnel *next;
1269 extern void xfrm_init(void);
1270 extern void xfrm4_init(void);
1271 extern void xfrm_state_init(void);
1272 extern void xfrm4_state_init(void);
1274 extern int xfrm6_init(void);
1275 extern void xfrm6_fini(void);
1276 extern int xfrm6_state_init(void);
1277 extern void xfrm6_state_fini(void);
1279 static inline int xfrm6_init(void)
1283 static inline void xfrm6_fini(void)
1289 #ifdef CONFIG_XFRM_STATISTICS
1290 extern int xfrm_proc_init(void);
1293 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1294 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1295 int (*func)(struct xfrm_state *, int, void*), void *);
1296 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1297 extern struct xfrm_state *xfrm_state_alloc(void);
1298 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1299 struct flowi *fl, struct xfrm_tmpl *tmpl,
1300 struct xfrm_policy *pol, int *err,
1301 unsigned short family);
1302 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1303 xfrm_address_t *saddr,
1304 unsigned short family,
1305 u8 mode, u8 proto, u32 reqid);
1306 extern int xfrm_state_check_expire(struct xfrm_state *x);
1307 extern void xfrm_state_insert(struct xfrm_state *x);
1308 extern int xfrm_state_add(struct xfrm_state *x);
1309 extern int xfrm_state_update(struct xfrm_state *x);
1310 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1311 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1312 #ifdef CONFIG_XFRM_SUB_POLICY
1313 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1314 int n, unsigned short family);
1315 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1316 int n, unsigned short family);
1318 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1319 int n, unsigned short family)
1324 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1325 int n, unsigned short family)
1331 struct xfrmk_sadinfo {
1332 u32 sadhcnt; /* current hash bkts */
1333 u32 sadhmcnt; /* max allowed hash bkts */
1334 u32 sadcnt; /* current running count */
1337 struct xfrmk_spdinfo {
1348 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1349 extern int xfrm_state_delete(struct xfrm_state *x);
1350 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1351 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1352 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1353 extern int xfrm_replay_check(struct xfrm_state *x,
1354 struct sk_buff *skb, __be32 seq);
1355 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1356 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1357 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1358 extern int xfrm_init_state(struct xfrm_state *x);
1359 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1360 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1362 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1363 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1364 extern int xfrm_output(struct sk_buff *skb);
1365 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1366 extern int xfrm4_extract_header(struct sk_buff *skb);
1367 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1370 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1371 extern int xfrm4_rcv(struct sk_buff *skb);
1373 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1375 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1378 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1380 extern int xfrm4_output(struct sk_buff *skb);
1381 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1382 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1383 extern int xfrm6_extract_header(struct sk_buff *skb);
1384 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1386 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1387 extern int xfrm6_rcv(struct sk_buff *skb);
1388 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1389 xfrm_address_t *saddr, u8 proto);
1390 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1391 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1392 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1393 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1394 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1395 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm6_output(struct sk_buff *skb);
1398 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1402 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1403 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1405 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1407 return -ENOPROTOOPT;
1410 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1412 /* should not happen */
1418 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1420 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1421 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1422 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1423 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1424 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1425 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1426 struct xfrm_selector *sel,
1427 struct xfrm_sec_ctx *ctx, int delete,
1429 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1430 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1431 u32 xfrm_get_acqseq(void);
1432 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1433 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1434 xfrm_address_t *daddr, xfrm_address_t *saddr,
1435 int create, unsigned short family);
1436 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1437 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1438 struct flowi *fl, int family, int strict);
1440 #ifdef CONFIG_XFRM_MIGRATE
1441 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1442 struct xfrm_migrate *m, int num_bundles,
1443 struct xfrm_kmaddress *k);
1444 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1445 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1446 struct xfrm_migrate *m);
1447 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1448 struct xfrm_migrate *m, int num_bundles,
1449 struct xfrm_kmaddress *k);
1452 extern wait_queue_head_t km_waitq;
1453 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1454 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1455 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1457 extern void xfrm_input_init(void);
1458 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1460 extern void xfrm_probe_algs(void);
1461 extern int xfrm_count_auth_supported(void);
1462 extern int xfrm_count_enc_supported(void);
1463 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1464 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1465 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1466 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1467 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1469 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1470 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1476 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1479 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1480 int offset, int len, icv_update_fn_t icv_update);
1482 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1488 return (__force __u32)a->a4 - (__force __u32)b->a4;
1490 return ipv6_addr_cmp((struct in6_addr *)a,
1491 (struct in6_addr *)b);
1495 static inline int xfrm_policy_id2dir(u32 index)
1500 static inline int xfrm_aevent_is_on(void)
1506 nlsk = rcu_dereference(xfrm_nl);
1508 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1513 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1515 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1518 #ifdef CONFIG_XFRM_MIGRATE
1519 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1521 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1524 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1527 for (i = 0; i < n; i++)
1528 xfrm_state_put(*(states + i));
1531 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1534 for (i = 0; i < n; i++)
1535 xfrm_state_delete(*(states + i));
1539 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1541 return skb->sp->xvec[skb->sp->len - 1];
1544 #endif /* _NET_XFRM_H */