4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
19 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
57 extern struct mutex xfrm_cfg_mutex;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 struct list_head all;
125 struct list_head gclist;
126 struct hlist_node bydst;
128 struct hlist_node bysrc;
129 struct hlist_node byspi;
135 struct xfrm_selector sel;
139 /* Key manger bits */
146 /* Parameters of this state. */
151 u8 aalgo, ealgo, calgo;
154 xfrm_address_t saddr;
159 struct xfrm_lifetime_cfg lft;
161 /* Data for transformer */
162 struct xfrm_algo *aalg;
163 struct xfrm_algo *ealg;
164 struct xfrm_algo *calg;
165 struct xfrm_algo_aead *aead;
167 /* Data for encapsulator */
168 struct xfrm_encap_tmpl *encap;
170 /* Data for care-of address */
171 xfrm_address_t *coaddr;
173 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
174 struct xfrm_state *tunnel;
176 /* If a tunnel, number of users + 1 */
177 atomic_t tunnel_users;
179 /* State for replay detection */
180 struct xfrm_replay_state replay;
182 /* Replay detection state at the time we sent the last notification */
183 struct xfrm_replay_state preplay;
185 /* internal flag that only holds state for delayed aevent at the
190 /* Replay detection notification settings */
194 /* Replay detection notification timer */
195 struct timer_list rtimer;
198 struct xfrm_stats stats;
200 struct xfrm_lifetime_cur curlft;
201 struct timer_list timer;
204 unsigned long lastused;
206 /* Reference to data common to all the instances of this
208 const struct xfrm_type *type;
209 struct xfrm_mode *inner_mode;
210 struct xfrm_mode *inner_mode_iaf;
211 struct xfrm_mode *outer_mode;
213 /* Security context */
214 struct xfrm_sec_ctx *security;
216 /* Private data of this transformer, format is opaque,
217 * interpreted by xfrm_type methods. */
221 /* xflags - make enum if more show up */
222 #define XFRM_TIME_DEFER 1
233 /* callback structure passed from either netlink or pfkey */
252 struct xfrm_policy_afinfo {
253 unsigned short family;
254 struct dst_ops *dst_ops;
255 void (*garbage_collect)(void);
256 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
257 xfrm_address_t *daddr);
258 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
259 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
260 void (*decode_session)(struct sk_buff *skb,
263 int (*get_tos)(struct flowi *fl);
264 int (*init_path)(struct xfrm_dst *path,
265 struct dst_entry *dst,
267 int (*fill_dst)(struct xfrm_dst *xdst,
268 struct net_device *dev);
271 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
272 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
273 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
274 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
277 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
278 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
279 extern int __xfrm_state_delete(struct xfrm_state *x);
281 struct xfrm_state_afinfo {
285 struct module *owner;
286 const struct xfrm_type *type_map[IPPROTO_MAX];
287 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
288 int (*init_flags)(struct xfrm_state *x);
289 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
290 struct xfrm_tmpl *tmpl,
291 xfrm_address_t *daddr, xfrm_address_t *saddr);
292 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
293 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
294 int (*output)(struct sk_buff *skb);
295 int (*extract_input)(struct xfrm_state *x,
296 struct sk_buff *skb);
297 int (*extract_output)(struct xfrm_state *x,
298 struct sk_buff *skb);
299 int (*transport_finish)(struct sk_buff *skb,
303 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
304 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
306 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
311 struct module *owner;
314 #define XFRM_TYPE_NON_FRAGMENT 1
315 #define XFRM_TYPE_REPLAY_PROT 2
316 #define XFRM_TYPE_LOCAL_COADDR 4
317 #define XFRM_TYPE_REMOTE_COADDR 8
319 int (*init_state)(struct xfrm_state *x);
320 void (*destructor)(struct xfrm_state *);
321 int (*input)(struct xfrm_state *, struct sk_buff *skb);
322 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
323 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
324 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
325 /* Estimate maximal size of result of transformation of a dgram */
326 u32 (*get_mtu)(struct xfrm_state *, int size);
329 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
330 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
334 * Remove encapsulation header.
336 * The IP header will be moved over the top of the encapsulation
339 * On entry, the transport header shall point to where the IP header
340 * should be and the network header shall be set to where the IP
341 * header currently is. skb->data shall point to the start of the
344 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
347 * This is the actual input entry point.
349 * For transport mode and equivalent this would be identical to
350 * input2 (which does not need to be set). While tunnel mode
351 * and equivalent would set this to the tunnel encapsulation function
352 * xfrm4_prepare_input that would in turn call input2.
354 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
357 * Add encapsulation header.
359 * On exit, the transport header will be set to the start of the
360 * encapsulation header to be filled in by x->type->output and
361 * the mac header will be set to the nextheader (protocol for
362 * IPv4) field of the extension header directly preceding the
363 * encapsulation header, or in its absence, that of the top IP
364 * header. The value of the network header will always point
365 * to the top IP header while skb->data will point to the payload.
367 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
370 * This is the actual output entry point.
372 * For transport mode and equivalent this would be identical to
373 * output2 (which does not need to be set). While tunnel mode
374 * and equivalent would set this to a tunnel encapsulation function
375 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
378 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
380 struct xfrm_state_afinfo *afinfo;
381 struct module *owner;
386 /* Flags for xfrm_mode. */
388 XFRM_MODE_FLAG_TUNNEL = 1,
391 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
392 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
394 static inline int xfrm_af2proto(unsigned int family)
406 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
408 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
409 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
410 return x->inner_mode;
412 return x->inner_mode_iaf;
417 /* id in template is interpreted as:
418 * daddr - destination of tunnel, may be zero for transport mode.
419 * spi - zero to acquire spi. Not zero if spi is static, then
420 * daddr must be fixed too.
421 * proto - AH/ESP/IPCOMP
425 /* Source address of tunnel. Ignored, if it is not a tunnel. */
426 xfrm_address_t saddr;
428 unsigned short encap_family;
432 /* Mode: transport, tunnel etc. */
435 /* Sharing mode: unique, this session only, this user only etc. */
438 /* May skip this transfomration if no SA is found */
441 /* Skip aalgos/ealgos/calgos checks. */
444 /* Bit mask of algos allowed for acquisition */
450 #define XFRM_MAX_DEPTH 6
454 struct xfrm_policy *next;
455 struct list_head bytype;
456 struct hlist_node bydst;
457 struct hlist_node byidx;
459 /* This lock only affects elements except for entry. */
462 struct timer_list timer;
466 struct xfrm_selector selector;
467 struct xfrm_lifetime_cfg lft;
468 struct xfrm_lifetime_cur curlft;
469 struct dst_entry *bundles;
476 /* XXX 1 byte hole, try to pack */
477 struct xfrm_sec_ctx *security;
478 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
481 struct xfrm_migrate {
482 xfrm_address_t old_daddr;
483 xfrm_address_t old_saddr;
484 xfrm_address_t new_daddr;
485 xfrm_address_t new_saddr;
494 #define XFRM_KM_TIMEOUT 30
496 #define XFRM_REPLAY_SEQ 1
497 #define XFRM_REPLAY_OSEQ 2
498 #define XFRM_REPLAY_SEQ_MASK 3
500 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
501 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
503 /* default aevent timeout in units of 100ms */
504 #define XFRM_AE_ETIME 10
505 /* Async Event timer multiplier */
506 #define XFRM_AE_ETH_M 10
507 /* default seq threshold size */
508 #define XFRM_AE_SEQT_SIZE 2
512 struct list_head list;
514 int (*notify)(struct xfrm_state *x, struct km_event *c);
515 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
516 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
517 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
518 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
519 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
520 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
523 extern int xfrm_register_km(struct xfrm_mgr *km);
524 extern int xfrm_unregister_km(struct xfrm_mgr *km);
526 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
529 * This structure is used for the duration where packets are being
530 * transformed by IPsec. As soon as the packet leaves IPsec the
531 * area beyond the generic IP part may be overwritten.
535 struct inet_skb_parm h4;
536 struct inet6_skb_parm h6;
539 /* Sequence number for replay protection. */
546 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
549 * This structure is used by the afinfo prepare_input/prepare_output functions
550 * to transmit header information to the mode input/output functions.
552 struct xfrm_mode_skb_cb {
554 struct inet_skb_parm h4;
555 struct inet6_skb_parm h6;
558 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
562 /* IP header length (excluding options or extension headers). */
565 /* TOS for IPv4, class for IPv6. */
568 /* TTL for IPv4, hop limitfor IPv6. */
571 /* Protocol for IPv4, NH for IPv6. */
574 /* Option length for IPv4, zero for IPv6. */
577 /* Used by IPv6 only, zero for IPv4. */
581 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
584 * This structure is used by the input processing to locate the SPI and
585 * related information.
587 struct xfrm_spi_skb_cb {
589 struct inet_skb_parm h4;
590 struct inet6_skb_parm h6;
593 unsigned int daddroff;
597 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
599 /* Audit Information */
607 #ifdef CONFIG_AUDITSYSCALL
608 static inline struct audit_buffer *xfrm_audit_start(const char *op)
610 struct audit_buffer *audit_buf = NULL;
612 if (audit_enabled == 0)
614 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
615 AUDIT_MAC_IPSEC_EVENT);
616 if (audit_buf == NULL)
618 audit_log_format(audit_buf, "op=%s", op);
622 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
623 struct audit_buffer *audit_buf)
628 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
630 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
631 audit_log_format(audit_buf, " subj=%s", secctx);
632 security_release_secctx(secctx, secctx_len);
634 audit_log_task_context(audit_buf);
637 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
638 u32 auid, u32 ses, u32 secid);
639 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
640 u32 auid, u32 ses, u32 secid);
641 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
642 u32 auid, u32 ses, u32 secid);
643 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
644 u32 auid, u32 ses, u32 secid);
645 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
646 struct sk_buff *skb);
647 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
648 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
649 __be32 net_spi, __be32 net_seq);
650 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
651 struct sk_buff *skb, u8 proto);
654 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
655 u32 auid, u32 ses, u32 secid)
659 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
660 u32 auid, u32 ses, u32 secid)
664 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
665 u32 auid, u32 ses, u32 secid)
669 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
670 u32 auid, u32 ses, u32 secid)
674 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
679 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
684 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
685 __be32 net_spi, __be32 net_seq)
689 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
690 struct sk_buff *skb, u8 proto)
693 #endif /* CONFIG_AUDITSYSCALL */
695 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
697 if (likely(policy != NULL))
698 atomic_inc(&policy->refcnt);
701 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
703 static inline void xfrm_pol_put(struct xfrm_policy *policy)
705 if (atomic_dec_and_test(&policy->refcnt))
706 xfrm_policy_destroy(policy);
709 #ifdef CONFIG_XFRM_SUB_POLICY
710 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
713 for (i = npols - 1; i >= 0; --i)
714 xfrm_pol_put(pols[i]);
717 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
719 xfrm_pol_put(pols[0]);
723 extern void __xfrm_state_destroy(struct xfrm_state *);
725 static inline void __xfrm_state_put(struct xfrm_state *x)
727 atomic_dec(&x->refcnt);
730 static inline void xfrm_state_put(struct xfrm_state *x)
732 if (atomic_dec_and_test(&x->refcnt))
733 __xfrm_state_destroy(x);
736 static inline void xfrm_state_hold(struct xfrm_state *x)
738 atomic_inc(&x->refcnt);
741 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
748 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
749 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
752 if (memcmp(a1, a2, pdw << 2))
758 mask = htonl((0xffffffff) << (32 - pbi));
760 if ((a1[pdw] ^ a2[pdw]) & mask)
768 __be16 xfrm_flowi_sport(struct flowi *fl)
774 case IPPROTO_UDPLITE:
776 port = fl->fl_ip_sport;
780 port = htons(fl->fl_icmp_type);
783 port = htons(fl->fl_mh_type);
792 __be16 xfrm_flowi_dport(struct flowi *fl)
798 case IPPROTO_UDPLITE:
800 port = fl->fl_ip_dport;
804 port = htons(fl->fl_icmp_code);
812 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
813 unsigned short family);
815 #ifdef CONFIG_SECURITY_NETWORK_XFRM
816 /* If neither has a context --> match
817 * Otherwise, both must have a context and the sids, doi, alg must match
819 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
821 return ((!s1 && !s2) ||
823 (s1->ctx_sid == s2->ctx_sid) &&
824 (s1->ctx_doi == s2->ctx_doi) &&
825 (s1->ctx_alg == s2->ctx_alg)));
828 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
834 /* A struct encoding bundle of transformations to apply to some set of flow.
836 * dst->child points to the next element of bundle.
837 * dst->xfrm points to an instanse of transformer.
839 * Due to unfortunate limitations of current routing cache, which we
840 * have no time to fix, it mirrors struct rtable and bound to the same
841 * routing key, including saddr,daddr. However, we can have many of
842 * bundles differing by session id. All the bundles grow from a parent
848 struct dst_entry dst;
852 struct dst_entry *route;
853 #ifdef CONFIG_XFRM_SUB_POLICY
854 struct flowi *origin;
855 struct xfrm_selector *partner;
858 u32 route_mtu_cached;
859 u32 child_mtu_cached;
864 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
866 dst_release(xdst->route);
867 if (likely(xdst->u.dst.xfrm))
868 xfrm_state_put(xdst->u.dst.xfrm);
869 #ifdef CONFIG_XFRM_SUB_POLICY
872 kfree(xdst->partner);
873 xdst->partner = NULL;
877 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
883 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
886 static inline struct sec_path *
887 secpath_get(struct sec_path *sp)
890 atomic_inc(&sp->refcnt);
894 extern void __secpath_destroy(struct sec_path *sp);
897 secpath_put(struct sec_path *sp)
899 if (sp && atomic_dec_and_test(&sp->refcnt))
900 __secpath_destroy(sp);
903 extern struct sec_path *secpath_dup(struct sec_path *src);
906 secpath_reset(struct sk_buff *skb)
909 secpath_put(skb->sp);
915 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
919 return addr->a4 == 0;
921 return ipv6_addr_any((struct in6_addr *)&addr->a6);
927 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
929 return (tmpl->saddr.a4 &&
930 tmpl->saddr.a4 != x->props.saddr.a4);
934 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
936 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
937 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
941 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
945 return __xfrm4_state_addr_cmp(tmpl, x);
947 return __xfrm6_state_addr_cmp(tmpl, x);
953 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
955 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
957 unsigned int family, int reverse)
959 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
961 if (sk && sk->sk_policy[XFRM_POLICY_IN])
962 return __xfrm_policy_check(sk, ndir, skb, family);
964 return (!xfrm_policy_count[dir] && !skb->sp) ||
965 (skb->dst->flags & DST_NOPOLICY) ||
966 __xfrm_policy_check(sk, ndir, skb, family);
969 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
971 return __xfrm_policy_check2(sk, dir, skb, family, 0);
974 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
976 return xfrm_policy_check(sk, dir, skb, AF_INET);
979 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
981 return xfrm_policy_check(sk, dir, skb, AF_INET6);
984 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
987 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
990 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
993 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
996 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
997 unsigned int family, int reverse);
999 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1000 unsigned int family)
1002 return __xfrm_decode_session(skb, fl, family, 0);
1005 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1007 unsigned int family)
1009 return __xfrm_decode_session(skb, fl, family, 1);
1012 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1014 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1016 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1017 (skb->dst->flags & DST_NOXFRM) ||
1018 __xfrm_route_forward(skb, family);
1021 static inline int xfrm4_route_forward(struct sk_buff *skb)
1023 return xfrm_route_forward(skb, AF_INET);
1026 static inline int xfrm6_route_forward(struct sk_buff *skb)
1028 return xfrm_route_forward(skb, AF_INET6);
1031 extern int __xfrm_sk_clone_policy(struct sock *sk);
1033 static inline int xfrm_sk_clone_policy(struct sock *sk)
1035 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1036 return __xfrm_sk_clone_policy(sk);
1040 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1042 static inline void xfrm_sk_free_policy(struct sock *sk)
1044 if (unlikely(sk->sk_policy[0] != NULL)) {
1045 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1046 sk->sk_policy[0] = NULL;
1048 if (unlikely(sk->sk_policy[1] != NULL)) {
1049 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1050 sk->sk_policy[1] = NULL;
1056 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1057 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1058 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1059 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1060 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1064 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1068 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1072 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1074 unsigned int family)
1078 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1079 struct sk_buff *skb)
1083 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1084 struct sk_buff *skb)
1091 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1095 return (xfrm_address_t *)&fl->fl4_dst;
1097 return (xfrm_address_t *)&fl->fl6_dst;
1103 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1107 return (xfrm_address_t *)&fl->fl4_src;
1109 return (xfrm_address_t *)&fl->fl6_src;
1115 void xfrm_flowi_addr_get(struct flowi *fl,
1116 xfrm_address_t *saddr, xfrm_address_t *daddr,
1117 unsigned short family)
1121 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1122 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1125 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1126 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1131 static __inline__ int
1132 __xfrm4_state_addr_check(struct xfrm_state *x,
1133 xfrm_address_t *daddr, xfrm_address_t *saddr)
1135 if (daddr->a4 == x->id.daddr.a4 &&
1136 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1141 static __inline__ int
1142 __xfrm6_state_addr_check(struct xfrm_state *x,
1143 xfrm_address_t *daddr, xfrm_address_t *saddr)
1145 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1146 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1147 ipv6_addr_any((struct in6_addr *)saddr) ||
1148 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1153 static __inline__ int
1154 xfrm_state_addr_check(struct xfrm_state *x,
1155 xfrm_address_t *daddr, xfrm_address_t *saddr,
1156 unsigned short family)
1160 return __xfrm4_state_addr_check(x, daddr, saddr);
1162 return __xfrm6_state_addr_check(x, daddr, saddr);
1167 static __inline__ int
1168 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1169 unsigned short family)
1173 return __xfrm4_state_addr_check(x,
1174 (xfrm_address_t *)&fl->fl4_dst,
1175 (xfrm_address_t *)&fl->fl4_src);
1177 return __xfrm6_state_addr_check(x,
1178 (xfrm_address_t *)&fl->fl6_dst,
1179 (xfrm_address_t *)&fl->fl6_src);
1184 static inline int xfrm_state_kern(struct xfrm_state *x)
1186 return atomic_read(&x->tunnel_users);
1189 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1191 return (!userproto || proto == userproto ||
1192 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1193 proto == IPPROTO_ESP ||
1194 proto == IPPROTO_COMP)));
1198 * xfrm algorithm information
1200 struct xfrm_algo_aead_info {
1204 struct xfrm_algo_auth_info {
1209 struct xfrm_algo_encr_info {
1214 struct xfrm_algo_comp_info {
1218 struct xfrm_algo_desc {
1223 struct xfrm_algo_aead_info aead;
1224 struct xfrm_algo_auth_info auth;
1225 struct xfrm_algo_encr_info encr;
1226 struct xfrm_algo_comp_info comp;
1228 struct sadb_alg desc;
1231 /* XFRM tunnel handlers. */
1232 struct xfrm_tunnel {
1233 int (*handler)(struct sk_buff *skb);
1234 int (*err_handler)(struct sk_buff *skb, __u32 info);
1236 struct xfrm_tunnel *next;
1240 struct xfrm6_tunnel {
1241 int (*handler)(struct sk_buff *skb);
1242 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1243 int type, int code, int offset, __be32 info);
1244 struct xfrm6_tunnel *next;
1248 struct xfrm_state_walk {
1249 struct xfrm_state *state;
1254 struct xfrm_policy_walk {
1255 struct xfrm_policy *policy;
1260 extern void xfrm_init(void);
1261 extern void xfrm4_init(void);
1262 extern void xfrm_state_init(void);
1263 extern void xfrm4_state_init(void);
1265 extern int xfrm6_init(void);
1266 extern void xfrm6_fini(void);
1267 extern int xfrm6_state_init(void);
1268 extern void xfrm6_state_fini(void);
1270 static inline int xfrm6_init(void)
1274 static inline void xfrm6_fini(void)
1280 #ifdef CONFIG_XFRM_STATISTICS
1281 extern int xfrm_proc_init(void);
1284 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1286 walk->proto = proto;
1291 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1292 int (*func)(struct xfrm_state *, int, void*), void *);
1293 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1294 extern struct xfrm_state *xfrm_state_alloc(void);
1295 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1296 struct flowi *fl, struct xfrm_tmpl *tmpl,
1297 struct xfrm_policy *pol, int *err,
1298 unsigned short family);
1299 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1300 xfrm_address_t *saddr,
1301 unsigned short family,
1302 u8 mode, u8 proto, u32 reqid);
1303 extern int xfrm_state_check_expire(struct xfrm_state *x);
1304 extern void xfrm_state_insert(struct xfrm_state *x);
1305 extern int xfrm_state_add(struct xfrm_state *x);
1306 extern int xfrm_state_update(struct xfrm_state *x);
1307 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1308 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1309 #ifdef CONFIG_XFRM_SUB_POLICY
1310 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1311 int n, unsigned short family);
1312 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1313 int n, unsigned short family);
1315 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316 int n, unsigned short family)
1321 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1322 int n, unsigned short family)
1328 struct xfrmk_sadinfo {
1329 u32 sadhcnt; /* current hash bkts */
1330 u32 sadhmcnt; /* max allowed hash bkts */
1331 u32 sadcnt; /* current running count */
1334 struct xfrmk_spdinfo {
1345 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1346 extern int xfrm_state_delete(struct xfrm_state *x);
1347 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1348 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1349 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1350 extern int xfrm_replay_check(struct xfrm_state *x,
1351 struct sk_buff *skb, __be32 seq);
1352 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1353 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1354 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1355 extern int xfrm_init_state(struct xfrm_state *x);
1356 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1357 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1359 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1360 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1361 extern int xfrm_output(struct sk_buff *skb);
1362 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1363 extern int xfrm4_extract_header(struct sk_buff *skb);
1364 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1365 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1367 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1368 extern int xfrm4_rcv(struct sk_buff *skb);
1370 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1372 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1375 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1376 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1377 extern int xfrm4_output(struct sk_buff *skb);
1378 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1379 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1380 extern int xfrm6_extract_header(struct sk_buff *skb);
1381 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1382 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1383 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1384 extern int xfrm6_rcv(struct sk_buff *skb);
1385 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1386 xfrm_address_t *saddr, u8 proto);
1387 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1388 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1389 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1390 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1391 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1392 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1393 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1394 extern int xfrm6_output(struct sk_buff *skb);
1395 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1399 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1400 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1402 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1404 return -ENOPROTOOPT;
1407 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1409 /* should not happen */
1415 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1417 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1419 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1421 walk->policy = NULL;
1425 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1427 if (walk->policy != NULL) {
1428 xfrm_pol_put(walk->policy);
1429 walk->policy = NULL;
1433 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1434 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1435 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1436 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1437 struct xfrm_selector *sel,
1438 struct xfrm_sec_ctx *ctx, int delete,
1440 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1441 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1442 u32 xfrm_get_acqseq(void);
1443 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1444 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1445 xfrm_address_t *daddr, xfrm_address_t *saddr,
1446 int create, unsigned short family);
1447 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1448 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1449 struct flowi *fl, int family, int strict);
1451 #ifdef CONFIG_XFRM_MIGRATE
1452 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1453 struct xfrm_migrate *m, int num_bundles);
1454 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1455 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1456 struct xfrm_migrate *m);
1457 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles);
1461 extern wait_queue_head_t km_waitq;
1462 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1463 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1464 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1466 extern void xfrm_input_init(void);
1467 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1469 extern void xfrm_probe_algs(void);
1470 extern int xfrm_count_auth_supported(void);
1471 extern int xfrm_count_enc_supported(void);
1472 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1473 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1474 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1475 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1476 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1477 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1478 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1479 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1480 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1485 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1488 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1489 int offset, int len, icv_update_fn_t icv_update);
1491 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1497 return (__force __u32)a->a4 - (__force __u32)b->a4;
1499 return ipv6_addr_cmp((struct in6_addr *)a,
1500 (struct in6_addr *)b);
1504 static inline int xfrm_policy_id2dir(u32 index)
1509 static inline int xfrm_aevent_is_on(void)
1515 nlsk = rcu_dereference(xfrm_nl);
1517 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1522 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1524 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1527 #ifdef CONFIG_XFRM_MIGRATE
1528 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1530 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1533 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1536 for (i = 0; i < n; i++)
1537 xfrm_state_put(*(states + i));
1540 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1543 for (i = 0; i < n; i++)
1544 xfrm_state_delete(*(states + i));
1548 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1550 return skb->sp->xvec[skb->sp->len - 1];
1553 #endif /* _NET_XFRM_H */