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>
23 #define XFRM_PROTO_ESP 50
24 #define XFRM_PROTO_AH 51
25 #define XFRM_PROTO_COMP 108
26 #define XFRM_PROTO_IPIP 4
27 #define XFRM_PROTO_IPV6 41
28 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
29 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
31 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
32 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
33 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
34 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
35 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
37 extern struct sock *xfrm_nl;
38 extern u32 sysctl_xfrm_aevent_etime;
39 extern u32 sysctl_xfrm_aevent_rseqth;
40 extern int sysctl_xfrm_larval_drop;
41 extern u32 sysctl_xfrm_acq_expires;
43 extern struct mutex xfrm_cfg_mutex;
45 /* Organization of SPD aka "XFRM rules"
46 ------------------------------------
49 - policy rule, struct xfrm_policy (=SPD entry)
50 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
51 - instance of a transformer, struct xfrm_state (=SA)
52 - template to clone xfrm_state, struct xfrm_tmpl
54 SPD is plain linear list of xfrm_policy rules, ordered by priority.
55 (To be compatible with existing pfkeyv2 implementations,
56 many rules with priority of 0x7fffffff are allowed to exist and
57 such rules are ordered in an unpredictable way, thanks to bsd folks.)
59 Lookup is plain linear search until the first match with selector.
61 If "action" is "block", then we prohibit the flow, otherwise:
62 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
63 policy entry has list of up to XFRM_MAX_DEPTH transformations,
64 described by templates xfrm_tmpl. Each template is resolved
65 to a complete xfrm_state (see below) and we pack bundle of transformations
66 to a dst_entry returned to requestor.
68 dst -. xfrm .-> xfrm_state #1
69 |---. child .-> dst -. xfrm .-> xfrm_state #2
70 |---. child .-> dst -. xfrm .-> xfrm_state #3
73 Bundles are cached at xrfm_policy struct (field ->bundles).
76 Resolution of xrfm_tmpl
77 -----------------------
79 1. ->mode Mode: transport or tunnel
80 2. ->id.proto Protocol: AH/ESP/IPCOMP
81 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
82 Q: allow to resolve security gateway?
83 4. ->id.spi If not zero, static SPI.
84 5. ->saddr Local tunnel endpoint, ignored for transport mode.
85 6. ->algos List of allowed algos. Plain bitmask now.
86 Q: ealgos, aalgos, calgos. What a mess...
87 7. ->share Sharing mode.
88 Q: how to implement private sharing mode? To add struct sock* to
91 Having this template we search through SAD searching for entries
92 with appropriate mode/proto/algo, permitted by selector.
93 If no appropriate entry found, it is requested from key manager.
96 Q: How to find all the bundles referring to a physical path for
97 PMTU discovery? Seems, dst should contain list of all parents...
98 and enter to infinite locking hierarchy disaster.
99 No! It is easier, we will not search for them, let them find us.
100 We add genid to each dst plus pointer to genid of raw IP route,
101 pmtu disc will update pmtu on raw IP route and increase its genid.
102 dst_check() will see this for top level and trigger resyncing
103 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
106 /* Full description of state of transformer. */
109 /* Note: bydst is re-used during gc */
110 struct hlist_node bydst;
111 struct hlist_node bysrc;
112 struct hlist_node byspi;
118 struct xfrm_selector sel;
122 /* Key manger bits */
129 /* Parameters of this state. */
134 u8 aalgo, ealgo, calgo;
137 xfrm_address_t saddr;
142 struct xfrm_lifetime_cfg lft;
144 /* Data for transformer */
145 struct xfrm_algo *aalg;
146 struct xfrm_algo *ealg;
147 struct xfrm_algo *calg;
149 /* Data for encapsulator */
150 struct xfrm_encap_tmpl *encap;
152 /* Data for care-of address */
153 xfrm_address_t *coaddr;
155 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
156 struct xfrm_state *tunnel;
158 /* If a tunnel, number of users + 1 */
159 atomic_t tunnel_users;
161 /* State for replay detection */
162 struct xfrm_replay_state replay;
164 /* Replay detection state at the time we sent the last notification */
165 struct xfrm_replay_state preplay;
167 /* internal flag that only holds state for delayed aevent at the
172 /* Replay detection notification settings */
176 /* Replay detection notification timer */
177 struct timer_list rtimer;
180 struct xfrm_stats stats;
182 struct xfrm_lifetime_cur curlft;
183 struct timer_list timer;
186 unsigned long lastused;
188 /* Reference to data common to all the instances of this
190 struct xfrm_type *type;
191 struct xfrm_mode *inner_mode;
192 struct xfrm_mode *outer_mode;
194 /* Security context */
195 struct xfrm_sec_ctx *security;
197 /* Private data of this transformer, format is opaque,
198 * interpreted by xfrm_type methods. */
202 /* xflags - make enum if more show up */
203 #define XFRM_TIME_DEFER 1
214 /* callback structure passed from either netlink or pfkey */
233 struct xfrm_policy_afinfo {
234 unsigned short family;
235 struct dst_ops *dst_ops;
236 void (*garbage_collect)(void);
237 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
238 xfrm_address_t *daddr);
239 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
240 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
241 void (*decode_session)(struct sk_buff *skb,
244 int (*get_tos)(struct flowi *fl);
245 int (*fill_dst)(struct xfrm_dst *xdst,
246 struct net_device *dev);
249 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
250 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
251 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
252 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
255 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
256 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
257 extern int __xfrm_state_delete(struct xfrm_state *x);
259 struct xfrm_state_afinfo {
262 unsigned int eth_proto;
263 struct module *owner;
264 struct xfrm_type *type_map[IPPROTO_MAX];
265 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
266 int (*init_flags)(struct xfrm_state *x);
267 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
268 struct xfrm_tmpl *tmpl,
269 xfrm_address_t *daddr, xfrm_address_t *saddr);
270 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
271 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
272 int (*output)(struct sk_buff *skb);
273 int (*extract_input)(struct xfrm_state *x,
274 struct sk_buff *skb);
275 int (*extract_output)(struct xfrm_state *x,
276 struct sk_buff *skb);
277 int (*transport_finish)(struct sk_buff *skb,
281 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
282 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
284 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
289 struct module *owner;
292 #define XFRM_TYPE_NON_FRAGMENT 1
293 #define XFRM_TYPE_REPLAY_PROT 2
294 #define XFRM_TYPE_LOCAL_COADDR 4
295 #define XFRM_TYPE_REMOTE_COADDR 8
297 int (*init_state)(struct xfrm_state *x);
298 void (*destructor)(struct xfrm_state *);
299 int (*input)(struct xfrm_state *, struct sk_buff *skb);
300 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
301 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
302 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
303 /* Estimate maximal size of result of transformation of a dgram */
304 u32 (*get_mtu)(struct xfrm_state *, int size);
307 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
308 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
312 * Remove encapsulation header.
314 * The IP header will be moved over the top of the encapsulation
317 * On entry, the transport header shall point to where the IP header
318 * should be and the network header shall be set to where the IP
319 * header currently is. skb->data shall point to the start of the
322 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
325 * This is the actual input entry point.
327 * For transport mode and equivalent this would be identical to
328 * input2 (which does not need to be set). While tunnel mode
329 * and equivalent would set this to the tunnel encapsulation function
330 * xfrm4_prepare_input that would in turn call input2.
332 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
335 * Add encapsulation header.
337 * On exit, the transport header will be set to the start of the
338 * encapsulation header to be filled in by x->type->output and
339 * the mac header will be set to the nextheader (protocol for
340 * IPv4) field of the extension header directly preceding the
341 * encapsulation header, or in its absence, that of the top IP
342 * header. The value of the network header will always point
343 * to the top IP header while skb->data will point to the payload.
345 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
348 * This is the actual output entry point.
350 * For transport mode and equivalent this would be identical to
351 * output2 (which does not need to be set). While tunnel mode
352 * and equivalent would set this to a tunnel encapsulation function
353 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
356 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
358 struct xfrm_state_afinfo *afinfo;
359 struct module *owner;
364 /* Flags for xfrm_mode. */
366 XFRM_MODE_FLAG_TUNNEL = 1,
369 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
370 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
374 /* id in template is interpreted as:
375 * daddr - destination of tunnel, may be zero for transport mode.
376 * spi - zero to acquire spi. Not zero if spi is static, then
377 * daddr must be fixed too.
378 * proto - AH/ESP/IPCOMP
382 /* Source address of tunnel. Ignored, if it is not a tunnel. */
383 xfrm_address_t saddr;
385 unsigned short encap_family;
389 /* Mode: transport, tunnel etc. */
392 /* Sharing mode: unique, this session only, this user only etc. */
395 /* May skip this transfomration if no SA is found */
398 /* Bit mask of algos allowed for acquisition */
404 #define XFRM_MAX_DEPTH 6
408 struct xfrm_policy *next;
409 struct hlist_node bydst;
410 struct hlist_node byidx;
412 /* This lock only affects elements except for entry. */
415 struct timer_list timer;
419 struct xfrm_selector selector;
420 struct xfrm_lifetime_cfg lft;
421 struct xfrm_lifetime_cur curlft;
422 struct dst_entry *bundles;
429 /* XXX 1 byte hole, try to pack */
430 struct xfrm_sec_ctx *security;
431 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
434 struct xfrm_migrate {
435 xfrm_address_t old_daddr;
436 xfrm_address_t old_saddr;
437 xfrm_address_t new_daddr;
438 xfrm_address_t new_saddr;
447 #define XFRM_KM_TIMEOUT 30
449 #define XFRM_REPLAY_SEQ 1
450 #define XFRM_REPLAY_OSEQ 2
451 #define XFRM_REPLAY_SEQ_MASK 3
453 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
454 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
456 /* default aevent timeout in units of 100ms */
457 #define XFRM_AE_ETIME 10
458 /* Async Event timer multiplier */
459 #define XFRM_AE_ETH_M 10
460 /* default seq threshold size */
461 #define XFRM_AE_SEQT_SIZE 2
465 struct list_head list;
467 int (*notify)(struct xfrm_state *x, struct km_event *c);
468 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
469 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
470 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
471 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
472 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
473 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
476 extern int xfrm_register_km(struct xfrm_mgr *km);
477 extern int xfrm_unregister_km(struct xfrm_mgr *km);
479 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
482 * This structure is used for the duration where packets are being
483 * transformed by IPsec. As soon as the packet leaves IPsec the
484 * area beyond the generic IP part may be overwritten.
488 struct inet_skb_parm h4;
489 struct inet6_skb_parm h6;
492 /* Sequence number for replay protection. */
496 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
499 * This structure is used by the afinfo prepare_input/prepare_output functions
500 * to transmit header information to the mode input/output functions.
502 struct xfrm_mode_skb_cb {
504 struct inet_skb_parm h4;
505 struct inet6_skb_parm h6;
508 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
512 /* TOS for IPv4, class for IPv6. */
515 /* TTL for IPv4, hop limitfor IPv6. */
518 /* Protocol for IPv4, NH for IPv6. */
521 /* Used by IPv6 only, zero for IPv4. */
525 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
528 * This structure is used by the input processing to locate the SPI and
529 * related information.
531 struct xfrm_spi_skb_cb {
533 struct inet_skb_parm h4;
534 struct inet6_skb_parm h6;
537 unsigned int daddroff;
541 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
543 /* Audit Information */
550 #ifdef CONFIG_AUDITSYSCALL
551 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
553 struct audit_buffer *audit_buf = NULL;
557 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
558 AUDIT_MAC_IPSEC_EVENT);
559 if (audit_buf == NULL)
562 audit_log_format(audit_buf, "auid=%u", auid);
565 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
566 audit_log_format(audit_buf, " subj=%s", secctx);
567 security_release_secctx(secctx, secctx_len);
569 audit_log_task_context(audit_buf);
573 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
575 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
577 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
579 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
582 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
583 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
584 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
585 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
586 #endif /* CONFIG_AUDITSYSCALL */
588 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
590 if (likely(policy != NULL))
591 atomic_inc(&policy->refcnt);
594 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
596 static inline void xfrm_pol_put(struct xfrm_policy *policy)
598 if (atomic_dec_and_test(&policy->refcnt))
599 __xfrm_policy_destroy(policy);
602 #ifdef CONFIG_XFRM_SUB_POLICY
603 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
606 for (i = npols - 1; i >= 0; --i)
607 xfrm_pol_put(pols[i]);
610 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
612 xfrm_pol_put(pols[0]);
616 extern void __xfrm_state_destroy(struct xfrm_state *);
618 static inline void __xfrm_state_put(struct xfrm_state *x)
620 atomic_dec(&x->refcnt);
623 static inline void xfrm_state_put(struct xfrm_state *x)
625 if (atomic_dec_and_test(&x->refcnt))
626 __xfrm_state_destroy(x);
629 static inline void xfrm_state_hold(struct xfrm_state *x)
631 atomic_inc(&x->refcnt);
634 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
641 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
642 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
645 if (memcmp(a1, a2, pdw << 2))
651 mask = htonl((0xffffffff) << (32 - pbi));
653 if ((a1[pdw] ^ a2[pdw]) & mask)
661 __be16 xfrm_flowi_sport(struct flowi *fl)
667 case IPPROTO_UDPLITE:
669 port = fl->fl_ip_sport;
673 port = htons(fl->fl_icmp_type);
676 port = htons(fl->fl_mh_type);
685 __be16 xfrm_flowi_dport(struct flowi *fl)
691 case IPPROTO_UDPLITE:
693 port = fl->fl_ip_dport;
697 port = htons(fl->fl_icmp_code);
705 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
706 unsigned short family);
708 #ifdef CONFIG_SECURITY_NETWORK_XFRM
709 /* If neither has a context --> match
710 * Otherwise, both must have a context and the sids, doi, alg must match
712 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
714 return ((!s1 && !s2) ||
716 (s1->ctx_sid == s2->ctx_sid) &&
717 (s1->ctx_doi == s2->ctx_doi) &&
718 (s1->ctx_alg == s2->ctx_alg)));
721 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
727 /* A struct encoding bundle of transformations to apply to some set of flow.
729 * dst->child points to the next element of bundle.
730 * dst->xfrm points to an instanse of transformer.
732 * Due to unfortunate limitations of current routing cache, which we
733 * have no time to fix, it mirrors struct rtable and bound to the same
734 * routing key, including saddr,daddr. However, we can have many of
735 * bundles differing by session id. All the bundles grow from a parent
741 struct dst_entry dst;
745 struct dst_entry *route;
746 #ifdef CONFIG_XFRM_SUB_POLICY
747 struct flowi *origin;
748 struct xfrm_selector *partner;
751 u32 route_mtu_cached;
752 u32 child_mtu_cached;
757 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
759 dst_release(xdst->route);
760 if (likely(xdst->u.dst.xfrm))
761 xfrm_state_put(xdst->u.dst.xfrm);
762 #ifdef CONFIG_XFRM_SUB_POLICY
765 kfree(xdst->partner);
766 xdst->partner = NULL;
770 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
776 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
779 static inline struct sec_path *
780 secpath_get(struct sec_path *sp)
783 atomic_inc(&sp->refcnt);
787 extern void __secpath_destroy(struct sec_path *sp);
790 secpath_put(struct sec_path *sp)
792 if (sp && atomic_dec_and_test(&sp->refcnt))
793 __secpath_destroy(sp);
796 extern struct sec_path *secpath_dup(struct sec_path *src);
799 secpath_reset(struct sk_buff *skb)
802 secpath_put(skb->sp);
808 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
812 return addr->a4 == 0;
814 return ipv6_addr_any((struct in6_addr *)&addr->a6);
820 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
822 return (tmpl->saddr.a4 &&
823 tmpl->saddr.a4 != x->props.saddr.a4);
827 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
829 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
830 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
834 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
838 return __xfrm4_state_addr_cmp(tmpl, x);
840 return __xfrm6_state_addr_cmp(tmpl, x);
846 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
848 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
850 unsigned int family, int reverse)
852 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
854 if (sk && sk->sk_policy[XFRM_POLICY_IN])
855 return __xfrm_policy_check(sk, ndir, skb, family);
857 return (!xfrm_policy_count[dir] && !skb->sp) ||
858 (skb->dst->flags & DST_NOPOLICY) ||
859 __xfrm_policy_check(sk, ndir, skb, family);
862 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
864 return __xfrm_policy_check2(sk, dir, skb, family, 0);
867 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
869 return xfrm_policy_check(sk, dir, skb, AF_INET);
872 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
874 return xfrm_policy_check(sk, dir, skb, AF_INET6);
877 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
880 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
883 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
886 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
889 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
890 unsigned int family, int reverse);
892 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
895 return __xfrm_decode_session(skb, fl, family, 0);
898 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
902 return __xfrm_decode_session(skb, fl, family, 1);
905 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
907 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
909 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
910 (skb->dst->flags & DST_NOXFRM) ||
911 __xfrm_route_forward(skb, family);
914 static inline int xfrm4_route_forward(struct sk_buff *skb)
916 return xfrm_route_forward(skb, AF_INET);
919 static inline int xfrm6_route_forward(struct sk_buff *skb)
921 return xfrm_route_forward(skb, AF_INET6);
924 extern int __xfrm_sk_clone_policy(struct sock *sk);
926 static inline int xfrm_sk_clone_policy(struct sock *sk)
928 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
929 return __xfrm_sk_clone_policy(sk);
933 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
935 static inline void xfrm_sk_free_policy(struct sock *sk)
937 if (unlikely(sk->sk_policy[0] != NULL)) {
938 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
939 sk->sk_policy[0] = NULL;
941 if (unlikely(sk->sk_policy[1] != NULL)) {
942 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
943 sk->sk_policy[1] = NULL;
949 static inline void xfrm_sk_free_policy(struct sock *sk) {}
950 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
951 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
952 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
953 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
957 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
961 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
965 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
971 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
976 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
984 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
988 return (xfrm_address_t *)&fl->fl4_dst;
990 return (xfrm_address_t *)&fl->fl6_dst;
996 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1000 return (xfrm_address_t *)&fl->fl4_src;
1002 return (xfrm_address_t *)&fl->fl6_src;
1007 static __inline__ int
1008 __xfrm4_state_addr_check(struct xfrm_state *x,
1009 xfrm_address_t *daddr, xfrm_address_t *saddr)
1011 if (daddr->a4 == x->id.daddr.a4 &&
1012 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1017 static __inline__ int
1018 __xfrm6_state_addr_check(struct xfrm_state *x,
1019 xfrm_address_t *daddr, xfrm_address_t *saddr)
1021 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1022 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1023 ipv6_addr_any((struct in6_addr *)saddr) ||
1024 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1029 static __inline__ int
1030 xfrm_state_addr_check(struct xfrm_state *x,
1031 xfrm_address_t *daddr, xfrm_address_t *saddr,
1032 unsigned short family)
1036 return __xfrm4_state_addr_check(x, daddr, saddr);
1038 return __xfrm6_state_addr_check(x, daddr, saddr);
1043 static __inline__ int
1044 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1045 unsigned short family)
1049 return __xfrm4_state_addr_check(x,
1050 (xfrm_address_t *)&fl->fl4_dst,
1051 (xfrm_address_t *)&fl->fl4_src);
1053 return __xfrm6_state_addr_check(x,
1054 (xfrm_address_t *)&fl->fl6_dst,
1055 (xfrm_address_t *)&fl->fl6_src);
1060 static inline int xfrm_state_kern(struct xfrm_state *x)
1062 return atomic_read(&x->tunnel_users);
1065 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1067 return (!userproto || proto == userproto ||
1068 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1069 proto == IPPROTO_ESP ||
1070 proto == IPPROTO_COMP)));
1074 * xfrm algorithm information
1076 struct xfrm_algo_auth_info {
1081 struct xfrm_algo_encr_info {
1086 struct xfrm_algo_comp_info {
1090 struct xfrm_algo_desc {
1095 struct xfrm_algo_auth_info auth;
1096 struct xfrm_algo_encr_info encr;
1097 struct xfrm_algo_comp_info comp;
1099 struct sadb_alg desc;
1102 /* XFRM tunnel handlers. */
1103 struct xfrm_tunnel {
1104 int (*handler)(struct sk_buff *skb);
1105 int (*err_handler)(struct sk_buff *skb, __u32 info);
1107 struct xfrm_tunnel *next;
1111 struct xfrm6_tunnel {
1112 int (*handler)(struct sk_buff *skb);
1113 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1114 int type, int code, int offset, __be32 info);
1115 struct xfrm6_tunnel *next;
1119 extern void xfrm_init(void);
1120 extern void xfrm4_init(void);
1121 extern void xfrm_state_init(void);
1122 extern void xfrm4_state_init(void);
1124 extern int xfrm6_init(void);
1125 extern void xfrm6_fini(void);
1126 extern int xfrm6_state_init(void);
1127 extern void xfrm6_state_fini(void);
1129 static inline int xfrm6_init(void)
1133 static inline void xfrm6_fini(void)
1139 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1140 extern struct xfrm_state *xfrm_state_alloc(void);
1141 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1142 struct flowi *fl, struct xfrm_tmpl *tmpl,
1143 struct xfrm_policy *pol, int *err,
1144 unsigned short family);
1145 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1146 xfrm_address_t *saddr,
1147 unsigned short family,
1148 u8 mode, u8 proto, u32 reqid);
1149 extern int xfrm_state_check_expire(struct xfrm_state *x);
1150 extern void xfrm_state_insert(struct xfrm_state *x);
1151 extern int xfrm_state_add(struct xfrm_state *x);
1152 extern int xfrm_state_update(struct xfrm_state *x);
1153 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1154 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1155 #ifdef CONFIG_XFRM_SUB_POLICY
1156 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1157 int n, unsigned short family);
1158 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1159 int n, unsigned short family);
1161 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1162 int n, unsigned short family)
1167 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1168 int n, unsigned short family)
1174 struct xfrmk_sadinfo {
1175 u32 sadhcnt; /* current hash bkts */
1176 u32 sadhmcnt; /* max allowed hash bkts */
1177 u32 sadcnt; /* current running count */
1180 struct xfrmk_spdinfo {
1191 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1192 extern int xfrm_state_delete(struct xfrm_state *x);
1193 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1194 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1195 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1196 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1197 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1198 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1199 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1200 extern int xfrm_init_state(struct xfrm_state *x);
1201 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1202 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1204 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1205 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1206 extern int xfrm_output(struct sk_buff *skb);
1207 extern int xfrm4_extract_header(struct sk_buff *skb);
1208 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1209 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1211 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1212 extern int xfrm4_rcv(struct sk_buff *skb);
1214 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1216 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1219 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1220 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1221 extern int xfrm4_output(struct sk_buff *skb);
1222 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1223 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1224 extern int xfrm6_extract_header(struct sk_buff *skb);
1225 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1226 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1227 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1228 extern int xfrm6_rcv(struct sk_buff *skb);
1229 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1230 xfrm_address_t *saddr, u8 proto);
1231 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1232 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1233 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1234 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1235 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1236 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1237 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1238 extern int xfrm6_output(struct sk_buff *skb);
1239 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1243 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1244 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1246 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1248 return -ENOPROTOOPT;
1251 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1253 /* should not happen */
1259 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1260 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1261 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1262 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1263 struct xfrm_selector *sel,
1264 struct xfrm_sec_ctx *ctx, int delete,
1266 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1267 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1268 u32 xfrm_get_acqseq(void);
1269 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1270 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1271 xfrm_address_t *daddr, xfrm_address_t *saddr,
1272 int create, unsigned short family);
1273 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1274 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1275 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1276 struct flowi *fl, int family, int strict);
1278 #ifdef CONFIG_XFRM_MIGRATE
1279 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1280 struct xfrm_migrate *m, int num_bundles);
1281 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1282 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1283 struct xfrm_migrate *m);
1284 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1285 struct xfrm_migrate *m, int num_bundles);
1288 extern wait_queue_head_t km_waitq;
1289 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1290 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1291 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1293 extern void xfrm_input_init(void);
1294 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1296 extern void xfrm_probe_algs(void);
1297 extern int xfrm_count_auth_supported(void);
1298 extern int xfrm_count_enc_supported(void);
1299 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1300 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1301 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1302 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1303 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1304 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1305 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1306 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1310 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1313 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1314 int offset, int len, icv_update_fn_t icv_update);
1316 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1322 return (__force __u32)a->a4 - (__force __u32)b->a4;
1324 return ipv6_addr_cmp((struct in6_addr *)a,
1325 (struct in6_addr *)b);
1329 static inline int xfrm_policy_id2dir(u32 index)
1334 static inline int xfrm_aevent_is_on(void)
1340 nlsk = rcu_dereference(xfrm_nl);
1342 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1347 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1349 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1352 #ifdef CONFIG_XFRM_MIGRATE
1353 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1355 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1358 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1361 for (i = 0; i < n; i++)
1362 xfrm_state_put(*(states + i));
1365 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1368 for (i = 0; i < n; i++)
1369 xfrm_state_delete(*(states + i));
1373 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1375 return skb->sp->xvec[skb->sp->len - 1];
1378 #endif /* _NET_XFRM_H */