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;
886 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
888 dst_release(xdst->route);
889 if (likely(xdst->u.dst.xfrm))
890 xfrm_state_put(xdst->u.dst.xfrm);
891 #ifdef CONFIG_XFRM_SUB_POLICY
894 kfree(xdst->partner);
895 xdst->partner = NULL;
900 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
906 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
909 static inline struct sec_path *
910 secpath_get(struct sec_path *sp)
913 atomic_inc(&sp->refcnt);
917 extern void __secpath_destroy(struct sec_path *sp);
920 secpath_put(struct sec_path *sp)
922 if (sp && atomic_dec_and_test(&sp->refcnt))
923 __secpath_destroy(sp);
926 extern struct sec_path *secpath_dup(struct sec_path *src);
929 secpath_reset(struct sk_buff *skb)
932 secpath_put(skb->sp);
938 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
942 return addr->a4 == 0;
944 return ipv6_addr_any((struct in6_addr *)&addr->a6);
950 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
952 return (tmpl->saddr.a4 &&
953 tmpl->saddr.a4 != x->props.saddr.a4);
957 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
959 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
960 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
964 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
968 return __xfrm4_state_addr_cmp(tmpl, x);
970 return __xfrm6_state_addr_cmp(tmpl, x);
976 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
978 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
980 unsigned int family, int reverse)
982 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
984 if (sk && sk->sk_policy[XFRM_POLICY_IN])
985 return __xfrm_policy_check(sk, ndir, skb, family);
987 return (!xfrm_policy_count[dir] && !skb->sp) ||
988 (skb->dst->flags & DST_NOPOLICY) ||
989 __xfrm_policy_check(sk, ndir, skb, family);
992 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
994 return __xfrm_policy_check2(sk, dir, skb, family, 0);
997 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
999 return xfrm_policy_check(sk, dir, skb, AF_INET);
1002 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1004 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1007 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1008 struct sk_buff *skb)
1010 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1013 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1014 struct sk_buff *skb)
1016 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1019 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1020 unsigned int family, int reverse);
1022 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023 unsigned int family)
1025 return __xfrm_decode_session(skb, fl, family, 0);
1028 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1030 unsigned int family)
1032 return __xfrm_decode_session(skb, fl, family, 1);
1035 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1037 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1039 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1040 (skb->dst->flags & DST_NOXFRM) ||
1041 __xfrm_route_forward(skb, family);
1044 static inline int xfrm4_route_forward(struct sk_buff *skb)
1046 return xfrm_route_forward(skb, AF_INET);
1049 static inline int xfrm6_route_forward(struct sk_buff *skb)
1051 return xfrm_route_forward(skb, AF_INET6);
1054 extern int __xfrm_sk_clone_policy(struct sock *sk);
1056 static inline int xfrm_sk_clone_policy(struct sock *sk)
1058 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1059 return __xfrm_sk_clone_policy(sk);
1063 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1065 static inline void xfrm_sk_free_policy(struct sock *sk)
1067 if (unlikely(sk->sk_policy[0] != NULL)) {
1068 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1069 sk->sk_policy[0] = NULL;
1071 if (unlikely(sk->sk_policy[1] != NULL)) {
1072 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1073 sk->sk_policy[1] = NULL;
1079 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1080 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1081 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1082 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1083 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1091 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1095 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1097 unsigned int family)
1101 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1102 struct sk_buff *skb)
1106 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1107 struct sk_buff *skb)
1114 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1118 return (xfrm_address_t *)&fl->fl4_dst;
1120 return (xfrm_address_t *)&fl->fl6_dst;
1126 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1130 return (xfrm_address_t *)&fl->fl4_src;
1132 return (xfrm_address_t *)&fl->fl6_src;
1138 void xfrm_flowi_addr_get(struct flowi *fl,
1139 xfrm_address_t *saddr, xfrm_address_t *daddr,
1140 unsigned short family)
1144 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1145 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1148 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1149 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1154 static __inline__ int
1155 __xfrm4_state_addr_check(struct xfrm_state *x,
1156 xfrm_address_t *daddr, xfrm_address_t *saddr)
1158 if (daddr->a4 == x->id.daddr.a4 &&
1159 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1164 static __inline__ int
1165 __xfrm6_state_addr_check(struct xfrm_state *x,
1166 xfrm_address_t *daddr, xfrm_address_t *saddr)
1168 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1169 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1170 ipv6_addr_any((struct in6_addr *)saddr) ||
1171 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1176 static __inline__ int
1177 xfrm_state_addr_check(struct xfrm_state *x,
1178 xfrm_address_t *daddr, xfrm_address_t *saddr,
1179 unsigned short family)
1183 return __xfrm4_state_addr_check(x, daddr, saddr);
1185 return __xfrm6_state_addr_check(x, daddr, saddr);
1190 static __inline__ int
1191 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1192 unsigned short family)
1196 return __xfrm4_state_addr_check(x,
1197 (xfrm_address_t *)&fl->fl4_dst,
1198 (xfrm_address_t *)&fl->fl4_src);
1200 return __xfrm6_state_addr_check(x,
1201 (xfrm_address_t *)&fl->fl6_dst,
1202 (xfrm_address_t *)&fl->fl6_src);
1207 static inline int xfrm_state_kern(struct xfrm_state *x)
1209 return atomic_read(&x->tunnel_users);
1212 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1214 return (!userproto || proto == userproto ||
1215 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1216 proto == IPPROTO_ESP ||
1217 proto == IPPROTO_COMP)));
1221 * xfrm algorithm information
1223 struct xfrm_algo_aead_info {
1227 struct xfrm_algo_auth_info {
1232 struct xfrm_algo_encr_info {
1237 struct xfrm_algo_comp_info {
1241 struct xfrm_algo_desc {
1246 struct xfrm_algo_aead_info aead;
1247 struct xfrm_algo_auth_info auth;
1248 struct xfrm_algo_encr_info encr;
1249 struct xfrm_algo_comp_info comp;
1251 struct sadb_alg desc;
1254 /* XFRM tunnel handlers. */
1255 struct xfrm_tunnel {
1256 int (*handler)(struct sk_buff *skb);
1257 int (*err_handler)(struct sk_buff *skb, __u32 info);
1259 struct xfrm_tunnel *next;
1263 struct xfrm6_tunnel {
1264 int (*handler)(struct sk_buff *skb);
1265 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1266 int type, int code, int offset, __be32 info);
1267 struct xfrm6_tunnel *next;
1271 extern void xfrm_init(void);
1272 extern void xfrm4_init(void);
1273 extern void xfrm_state_init(void);
1274 extern void xfrm4_state_init(void);
1276 extern int xfrm6_init(void);
1277 extern void xfrm6_fini(void);
1278 extern int xfrm6_state_init(void);
1279 extern void xfrm6_state_fini(void);
1281 static inline int xfrm6_init(void)
1285 static inline void xfrm6_fini(void)
1291 #ifdef CONFIG_XFRM_STATISTICS
1292 extern int xfrm_proc_init(void);
1295 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1296 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1297 int (*func)(struct xfrm_state *, int, void*), void *);
1298 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1299 extern struct xfrm_state *xfrm_state_alloc(void);
1300 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1301 struct flowi *fl, struct xfrm_tmpl *tmpl,
1302 struct xfrm_policy *pol, int *err,
1303 unsigned short family);
1304 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1305 xfrm_address_t *saddr,
1306 unsigned short family,
1307 u8 mode, u8 proto, u32 reqid);
1308 extern int xfrm_state_check_expire(struct xfrm_state *x);
1309 extern void xfrm_state_insert(struct xfrm_state *x);
1310 extern int xfrm_state_add(struct xfrm_state *x);
1311 extern int xfrm_state_update(struct xfrm_state *x);
1312 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1313 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1314 #ifdef CONFIG_XFRM_SUB_POLICY
1315 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316 int n, unsigned short family);
1317 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318 int n, unsigned short family);
1320 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1321 int n, unsigned short family)
1326 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1327 int n, unsigned short family)
1333 struct xfrmk_sadinfo {
1334 u32 sadhcnt; /* current hash bkts */
1335 u32 sadhmcnt; /* max allowed hash bkts */
1336 u32 sadcnt; /* current running count */
1339 struct xfrmk_spdinfo {
1350 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1351 extern int xfrm_state_delete(struct xfrm_state *x);
1352 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1353 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1354 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1355 extern int xfrm_replay_check(struct xfrm_state *x,
1356 struct sk_buff *skb, __be32 seq);
1357 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1358 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1359 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1360 extern int xfrm_init_state(struct xfrm_state *x);
1361 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1362 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1364 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1365 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1366 extern int xfrm_output(struct sk_buff *skb);
1367 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_extract_header(struct sk_buff *skb);
1369 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1370 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1372 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1373 extern int xfrm4_rcv(struct sk_buff *skb);
1375 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1377 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1380 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1382 extern int xfrm4_output(struct sk_buff *skb);
1383 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1384 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1385 extern int xfrm6_extract_header(struct sk_buff *skb);
1386 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1388 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1389 extern int xfrm6_rcv(struct sk_buff *skb);
1390 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1391 xfrm_address_t *saddr, u8 proto);
1392 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1393 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1394 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1395 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1396 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1397 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm6_output(struct sk_buff *skb);
1400 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1404 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1405 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1407 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1409 return -ENOPROTOOPT;
1412 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1414 /* should not happen */
1420 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1422 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1423 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1424 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1425 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1426 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1427 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1428 struct xfrm_selector *sel,
1429 struct xfrm_sec_ctx *ctx, int delete,
1431 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1432 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1433 u32 xfrm_get_acqseq(void);
1434 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1435 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1436 xfrm_address_t *daddr, xfrm_address_t *saddr,
1437 int create, unsigned short family);
1438 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1439 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1440 struct flowi *fl, int family, int strict);
1442 #ifdef CONFIG_XFRM_MIGRATE
1443 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1444 struct xfrm_migrate *m, int num_bundles,
1445 struct xfrm_kmaddress *k);
1446 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1447 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1448 struct xfrm_migrate *m);
1449 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1450 struct xfrm_migrate *m, int num_bundles,
1451 struct xfrm_kmaddress *k);
1454 extern wait_queue_head_t km_waitq;
1455 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1456 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1457 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1459 extern void xfrm_input_init(void);
1460 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1462 extern void xfrm_probe_algs(void);
1463 extern int xfrm_count_auth_supported(void);
1464 extern int xfrm_count_enc_supported(void);
1465 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1466 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1467 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1469 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1470 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1472 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1473 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1478 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1481 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1482 int offset, int len, icv_update_fn_t icv_update);
1484 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1490 return (__force __u32)a->a4 - (__force __u32)b->a4;
1492 return ipv6_addr_cmp((struct in6_addr *)a,
1493 (struct in6_addr *)b);
1497 static inline int xfrm_policy_id2dir(u32 index)
1502 static inline int xfrm_aevent_is_on(void)
1508 nlsk = rcu_dereference(xfrm_nl);
1510 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1515 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1517 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1520 #ifdef CONFIG_XFRM_MIGRATE
1521 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1523 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1526 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1529 for (i = 0; i < n; i++)
1530 xfrm_state_put(*(states + i));
1533 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1536 for (i = 0; i < n; i++)
1537 xfrm_state_delete(*(states + i));
1542 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1544 return skb->sp->xvec[skb->sp->len - 1];
1548 #endif /* _NET_XFRM_H */