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 hlist_node bydst;
471 struct hlist_node byidx;
473 /* This lock only affects elements except for entry. */
476 struct timer_list timer;
480 struct xfrm_selector selector;
481 struct xfrm_lifetime_cfg lft;
482 struct xfrm_lifetime_cur curlft;
483 struct dst_entry *bundles;
484 struct xfrm_policy_walk_entry walk;
490 struct xfrm_sec_ctx *security;
491 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
494 struct xfrm_kmaddress {
495 xfrm_address_t local;
496 xfrm_address_t remote;
501 struct xfrm_migrate {
502 xfrm_address_t old_daddr;
503 xfrm_address_t old_saddr;
504 xfrm_address_t new_daddr;
505 xfrm_address_t new_saddr;
514 #define XFRM_KM_TIMEOUT 30
516 #define XFRM_REPLAY_SEQ 1
517 #define XFRM_REPLAY_OSEQ 2
518 #define XFRM_REPLAY_SEQ_MASK 3
520 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
521 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
523 /* default aevent timeout in units of 100ms */
524 #define XFRM_AE_ETIME 10
525 /* Async Event timer multiplier */
526 #define XFRM_AE_ETH_M 10
527 /* default seq threshold size */
528 #define XFRM_AE_SEQT_SIZE 2
532 struct list_head list;
534 int (*notify)(struct xfrm_state *x, struct km_event *c);
535 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
536 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
537 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
538 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
539 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
540 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
543 extern int xfrm_register_km(struct xfrm_mgr *km);
544 extern int xfrm_unregister_km(struct xfrm_mgr *km);
546 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
549 * This structure is used for the duration where packets are being
550 * transformed by IPsec. As soon as the packet leaves IPsec the
551 * area beyond the generic IP part may be overwritten.
555 struct inet_skb_parm h4;
556 struct inet6_skb_parm h6;
559 /* Sequence number for replay protection. */
566 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
569 * This structure is used by the afinfo prepare_input/prepare_output functions
570 * to transmit header information to the mode input/output functions.
572 struct xfrm_mode_skb_cb {
574 struct inet_skb_parm h4;
575 struct inet6_skb_parm h6;
578 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
582 /* IP header length (excluding options or extension headers). */
585 /* TOS for IPv4, class for IPv6. */
588 /* TTL for IPv4, hop limitfor IPv6. */
591 /* Protocol for IPv4, NH for IPv6. */
594 /* Option length for IPv4, zero for IPv6. */
597 /* Used by IPv6 only, zero for IPv4. */
601 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
604 * This structure is used by the input processing to locate the SPI and
605 * related information.
607 struct xfrm_spi_skb_cb {
609 struct inet_skb_parm h4;
610 struct inet6_skb_parm h6;
613 unsigned int daddroff;
617 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
619 /* Audit Information */
627 #ifdef CONFIG_AUDITSYSCALL
628 static inline struct audit_buffer *xfrm_audit_start(const char *op)
630 struct audit_buffer *audit_buf = NULL;
632 if (audit_enabled == 0)
634 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
635 AUDIT_MAC_IPSEC_EVENT);
636 if (audit_buf == NULL)
638 audit_log_format(audit_buf, "op=%s", op);
642 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
643 struct audit_buffer *audit_buf)
648 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
650 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
651 audit_log_format(audit_buf, " subj=%s", secctx);
652 security_release_secctx(secctx, secctx_len);
654 audit_log_task_context(audit_buf);
657 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
658 u32 auid, u32 ses, u32 secid);
659 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
660 u32 auid, u32 ses, u32 secid);
661 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
662 u32 auid, u32 ses, u32 secid);
663 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
664 u32 auid, u32 ses, u32 secid);
665 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
666 struct sk_buff *skb);
667 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
668 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
669 __be32 net_spi, __be32 net_seq);
670 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
671 struct sk_buff *skb, u8 proto);
674 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
675 u32 auid, u32 ses, u32 secid)
679 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
680 u32 auid, u32 ses, u32 secid)
684 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
685 u32 auid, u32 ses, u32 secid)
689 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
690 u32 auid, u32 ses, u32 secid)
694 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
699 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
704 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
705 __be32 net_spi, __be32 net_seq)
709 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
710 struct sk_buff *skb, u8 proto)
713 #endif /* CONFIG_AUDITSYSCALL */
715 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
717 if (likely(policy != NULL))
718 atomic_inc(&policy->refcnt);
721 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
723 static inline void xfrm_pol_put(struct xfrm_policy *policy)
725 if (atomic_dec_and_test(&policy->refcnt))
726 xfrm_policy_destroy(policy);
729 #ifdef CONFIG_XFRM_SUB_POLICY
730 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
733 for (i = npols - 1; i >= 0; --i)
734 xfrm_pol_put(pols[i]);
737 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
739 xfrm_pol_put(pols[0]);
743 extern void __xfrm_state_destroy(struct xfrm_state *);
745 static inline void __xfrm_state_put(struct xfrm_state *x)
747 atomic_dec(&x->refcnt);
750 static inline void xfrm_state_put(struct xfrm_state *x)
752 if (atomic_dec_and_test(&x->refcnt))
753 __xfrm_state_destroy(x);
756 static inline void xfrm_state_hold(struct xfrm_state *x)
758 atomic_inc(&x->refcnt);
761 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
768 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
769 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
772 if (memcmp(a1, a2, pdw << 2))
778 mask = htonl((0xffffffff) << (32 - pbi));
780 if ((a1[pdw] ^ a2[pdw]) & mask)
788 __be16 xfrm_flowi_sport(struct flowi *fl)
794 case IPPROTO_UDPLITE:
796 port = fl->fl_ip_sport;
800 port = htons(fl->fl_icmp_type);
803 port = htons(fl->fl_mh_type);
812 __be16 xfrm_flowi_dport(struct flowi *fl)
818 case IPPROTO_UDPLITE:
820 port = fl->fl_ip_dport;
824 port = htons(fl->fl_icmp_code);
832 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
833 unsigned short family);
835 #ifdef CONFIG_SECURITY_NETWORK_XFRM
836 /* If neither has a context --> match
837 * Otherwise, both must have a context and the sids, doi, alg must match
839 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
841 return ((!s1 && !s2) ||
843 (s1->ctx_sid == s2->ctx_sid) &&
844 (s1->ctx_doi == s2->ctx_doi) &&
845 (s1->ctx_alg == s2->ctx_alg)));
848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
854 /* A struct encoding bundle of transformations to apply to some set of flow.
856 * dst->child points to the next element of bundle.
857 * dst->xfrm points to an instanse of transformer.
859 * Due to unfortunate limitations of current routing cache, which we
860 * have no time to fix, it mirrors struct rtable and bound to the same
861 * routing key, including saddr,daddr. However, we can have many of
862 * bundles differing by session id. All the bundles grow from a parent
868 struct dst_entry dst;
872 struct dst_entry *route;
873 #ifdef CONFIG_XFRM_SUB_POLICY
874 struct flowi *origin;
875 struct xfrm_selector *partner;
878 u32 route_mtu_cached;
879 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;
899 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
905 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
908 static inline struct sec_path *
909 secpath_get(struct sec_path *sp)
912 atomic_inc(&sp->refcnt);
916 extern void __secpath_destroy(struct sec_path *sp);
919 secpath_put(struct sec_path *sp)
921 if (sp && atomic_dec_and_test(&sp->refcnt))
922 __secpath_destroy(sp);
925 extern struct sec_path *secpath_dup(struct sec_path *src);
928 secpath_reset(struct sk_buff *skb)
931 secpath_put(skb->sp);
937 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
941 return addr->a4 == 0;
943 return ipv6_addr_any((struct in6_addr *)&addr->a6);
949 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
951 return (tmpl->saddr.a4 &&
952 tmpl->saddr.a4 != x->props.saddr.a4);
956 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
958 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
959 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
963 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
967 return __xfrm4_state_addr_cmp(tmpl, x);
969 return __xfrm6_state_addr_cmp(tmpl, x);
975 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
977 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
979 unsigned int family, int reverse)
981 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
983 if (sk && sk->sk_policy[XFRM_POLICY_IN])
984 return __xfrm_policy_check(sk, ndir, skb, family);
986 return (!xfrm_policy_count[dir] && !skb->sp) ||
987 (skb->dst->flags & DST_NOPOLICY) ||
988 __xfrm_policy_check(sk, ndir, skb, family);
991 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
993 return __xfrm_policy_check2(sk, dir, skb, family, 0);
996 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
998 return xfrm_policy_check(sk, dir, skb, AF_INET);
1001 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1003 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1006 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1007 struct sk_buff *skb)
1009 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1012 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1013 struct sk_buff *skb)
1015 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1018 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1019 unsigned int family, int reverse);
1021 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1022 unsigned int family)
1024 return __xfrm_decode_session(skb, fl, family, 0);
1027 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1029 unsigned int family)
1031 return __xfrm_decode_session(skb, fl, family, 1);
1034 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1036 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1038 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1039 (skb->dst->flags & DST_NOXFRM) ||
1040 __xfrm_route_forward(skb, family);
1043 static inline int xfrm4_route_forward(struct sk_buff *skb)
1045 return xfrm_route_forward(skb, AF_INET);
1048 static inline int xfrm6_route_forward(struct sk_buff *skb)
1050 return xfrm_route_forward(skb, AF_INET6);
1053 extern int __xfrm_sk_clone_policy(struct sock *sk);
1055 static inline int xfrm_sk_clone_policy(struct sock *sk)
1057 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1058 return __xfrm_sk_clone_policy(sk);
1062 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1064 static inline void xfrm_sk_free_policy(struct sock *sk)
1066 if (unlikely(sk->sk_policy[0] != NULL)) {
1067 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1068 sk->sk_policy[0] = NULL;
1070 if (unlikely(sk->sk_policy[1] != NULL)) {
1071 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1072 sk->sk_policy[1] = NULL;
1078 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1079 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1080 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1081 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1082 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1086 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1090 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1094 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1096 unsigned int family)
1100 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1101 struct sk_buff *skb)
1105 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1106 struct sk_buff *skb)
1113 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1117 return (xfrm_address_t *)&fl->fl4_dst;
1119 return (xfrm_address_t *)&fl->fl6_dst;
1125 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1129 return (xfrm_address_t *)&fl->fl4_src;
1131 return (xfrm_address_t *)&fl->fl6_src;
1137 void xfrm_flowi_addr_get(struct flowi *fl,
1138 xfrm_address_t *saddr, xfrm_address_t *daddr,
1139 unsigned short family)
1143 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1144 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1147 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1148 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1153 static __inline__ int
1154 __xfrm4_state_addr_check(struct xfrm_state *x,
1155 xfrm_address_t *daddr, xfrm_address_t *saddr)
1157 if (daddr->a4 == x->id.daddr.a4 &&
1158 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1163 static __inline__ int
1164 __xfrm6_state_addr_check(struct xfrm_state *x,
1165 xfrm_address_t *daddr, xfrm_address_t *saddr)
1167 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1168 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1169 ipv6_addr_any((struct in6_addr *)saddr) ||
1170 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1175 static __inline__ int
1176 xfrm_state_addr_check(struct xfrm_state *x,
1177 xfrm_address_t *daddr, xfrm_address_t *saddr,
1178 unsigned short family)
1182 return __xfrm4_state_addr_check(x, daddr, saddr);
1184 return __xfrm6_state_addr_check(x, daddr, saddr);
1189 static __inline__ int
1190 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1191 unsigned short family)
1195 return __xfrm4_state_addr_check(x,
1196 (xfrm_address_t *)&fl->fl4_dst,
1197 (xfrm_address_t *)&fl->fl4_src);
1199 return __xfrm6_state_addr_check(x,
1200 (xfrm_address_t *)&fl->fl6_dst,
1201 (xfrm_address_t *)&fl->fl6_src);
1206 static inline int xfrm_state_kern(struct xfrm_state *x)
1208 return atomic_read(&x->tunnel_users);
1211 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1213 return (!userproto || proto == userproto ||
1214 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1215 proto == IPPROTO_ESP ||
1216 proto == IPPROTO_COMP)));
1220 * xfrm algorithm information
1222 struct xfrm_algo_aead_info {
1226 struct xfrm_algo_auth_info {
1231 struct xfrm_algo_encr_info {
1236 struct xfrm_algo_comp_info {
1240 struct xfrm_algo_desc {
1245 struct xfrm_algo_aead_info aead;
1246 struct xfrm_algo_auth_info auth;
1247 struct xfrm_algo_encr_info encr;
1248 struct xfrm_algo_comp_info comp;
1250 struct sadb_alg desc;
1253 /* XFRM tunnel handlers. */
1254 struct xfrm_tunnel {
1255 int (*handler)(struct sk_buff *skb);
1256 int (*err_handler)(struct sk_buff *skb, __u32 info);
1258 struct xfrm_tunnel *next;
1262 struct xfrm6_tunnel {
1263 int (*handler)(struct sk_buff *skb);
1264 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1265 int type, int code, int offset, __be32 info);
1266 struct xfrm6_tunnel *next;
1270 extern void xfrm_init(void);
1271 extern void xfrm4_init(void);
1272 extern void xfrm_state_init(void);
1273 extern void xfrm4_state_init(void);
1275 extern int xfrm6_init(void);
1276 extern void xfrm6_fini(void);
1277 extern int xfrm6_state_init(void);
1278 extern void xfrm6_state_fini(void);
1280 static inline int xfrm6_init(void)
1284 static inline void xfrm6_fini(void)
1290 #ifdef CONFIG_XFRM_STATISTICS
1291 extern int xfrm_proc_init(void);
1294 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1295 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1296 int (*func)(struct xfrm_state *, int, void*), void *);
1297 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1298 extern struct xfrm_state *xfrm_state_alloc(void);
1299 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1300 struct flowi *fl, struct xfrm_tmpl *tmpl,
1301 struct xfrm_policy *pol, int *err,
1302 unsigned short family);
1303 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1304 xfrm_address_t *saddr,
1305 unsigned short family,
1306 u8 mode, u8 proto, u32 reqid);
1307 extern int xfrm_state_check_expire(struct xfrm_state *x);
1308 extern void xfrm_state_insert(struct xfrm_state *x);
1309 extern int xfrm_state_add(struct xfrm_state *x);
1310 extern int xfrm_state_update(struct xfrm_state *x);
1311 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1312 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1313 #ifdef CONFIG_XFRM_SUB_POLICY
1314 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1315 int n, unsigned short family);
1316 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1317 int n, unsigned short family);
1319 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1320 int n, unsigned short family)
1325 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1326 int n, unsigned short family)
1332 struct xfrmk_sadinfo {
1333 u32 sadhcnt; /* current hash bkts */
1334 u32 sadhmcnt; /* max allowed hash bkts */
1335 u32 sadcnt; /* current running count */
1338 struct xfrmk_spdinfo {
1349 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1350 extern int xfrm_state_delete(struct xfrm_state *x);
1351 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1352 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1353 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1354 extern int xfrm_replay_check(struct xfrm_state *x,
1355 struct sk_buff *skb, __be32 seq);
1356 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1357 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1358 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1359 extern int xfrm_init_state(struct xfrm_state *x);
1360 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1361 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1364 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1365 extern int xfrm_output(struct sk_buff *skb);
1366 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1367 extern int xfrm4_extract_header(struct sk_buff *skb);
1368 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1369 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1371 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1372 extern int xfrm4_rcv(struct sk_buff *skb);
1374 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1376 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1379 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1380 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm4_output(struct sk_buff *skb);
1382 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1383 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1384 extern int xfrm6_extract_header(struct sk_buff *skb);
1385 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1386 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1387 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1388 extern int xfrm6_rcv(struct sk_buff *skb);
1389 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1390 xfrm_address_t *saddr, u8 proto);
1391 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1392 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1393 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1394 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1395 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1396 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm6_output(struct sk_buff *skb);
1399 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1403 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1404 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1406 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1408 return -ENOPROTOOPT;
1411 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1413 /* should not happen */
1419 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1421 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1422 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1423 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1424 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1425 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1426 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1427 struct xfrm_selector *sel,
1428 struct xfrm_sec_ctx *ctx, int delete,
1430 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1431 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1432 u32 xfrm_get_acqseq(void);
1433 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1434 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1435 xfrm_address_t *daddr, xfrm_address_t *saddr,
1436 int create, unsigned short family);
1437 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1438 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1439 struct flowi *fl, int family, int strict);
1441 #ifdef CONFIG_XFRM_MIGRATE
1442 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1443 struct xfrm_migrate *m, int num_bundles,
1444 struct xfrm_kmaddress *k);
1445 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1446 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1447 struct xfrm_migrate *m);
1448 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1449 struct xfrm_migrate *m, int num_bundles,
1450 struct xfrm_kmaddress *k);
1453 extern wait_queue_head_t km_waitq;
1454 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1455 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1456 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1458 extern void xfrm_input_init(void);
1459 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1461 extern void xfrm_probe_algs(void);
1462 extern int xfrm_count_auth_supported(void);
1463 extern int xfrm_count_enc_supported(void);
1464 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1465 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1466 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1467 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1469 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1470 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1472 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1477 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1480 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1481 int offset, int len, icv_update_fn_t icv_update);
1483 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1489 return (__force __u32)a->a4 - (__force __u32)b->a4;
1491 return ipv6_addr_cmp((struct in6_addr *)a,
1492 (struct in6_addr *)b);
1496 static inline int xfrm_policy_id2dir(u32 index)
1501 static inline int xfrm_aevent_is_on(void)
1507 nlsk = rcu_dereference(xfrm_nl);
1509 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1514 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1516 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1519 #ifdef CONFIG_XFRM_MIGRATE
1520 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1522 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1525 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1528 for (i = 0; i < n; i++)
1529 xfrm_state_put(*(states + i));
1532 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1535 for (i = 0; i < n; i++)
1536 xfrm_state_delete(*(states + i));
1541 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1543 return skb->sp->xvec[skb->sp->len - 1];
1547 #endif /* _NET_XFRM_H */