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,
243 int (*get_tos)(struct flowi *fl);
244 int (*fill_dst)(struct xfrm_dst *xdst,
245 struct net_device *dev);
248 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
249 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
250 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
251 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
254 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
255 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
256 extern int __xfrm_state_delete(struct xfrm_state *x);
258 struct xfrm_state_afinfo {
261 unsigned int eth_proto;
262 struct module *owner;
263 struct xfrm_type *type_map[IPPROTO_MAX];
264 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
265 int (*init_flags)(struct xfrm_state *x);
266 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
267 struct xfrm_tmpl *tmpl,
268 xfrm_address_t *daddr, xfrm_address_t *saddr);
269 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
270 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
271 int (*output)(struct sk_buff *skb);
272 int (*extract_input)(struct xfrm_state *x,
273 struct sk_buff *skb);
274 int (*extract_output)(struct xfrm_state *x,
275 struct sk_buff *skb);
276 int (*transport_finish)(struct sk_buff *skb,
280 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
281 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
283 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
288 struct module *owner;
291 #define XFRM_TYPE_NON_FRAGMENT 1
292 #define XFRM_TYPE_REPLAY_PROT 2
293 #define XFRM_TYPE_LOCAL_COADDR 4
294 #define XFRM_TYPE_REMOTE_COADDR 8
296 int (*init_state)(struct xfrm_state *x);
297 void (*destructor)(struct xfrm_state *);
298 int (*input)(struct xfrm_state *, struct sk_buff *skb);
299 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
300 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
301 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
302 /* Estimate maximal size of result of transformation of a dgram */
303 u32 (*get_mtu)(struct xfrm_state *, int size);
306 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
307 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
311 * Remove encapsulation header.
313 * The IP header will be moved over the top of the encapsulation
316 * On entry, the transport header shall point to where the IP header
317 * should be and the network header shall be set to where the IP
318 * header currently is. skb->data shall point to the start of the
321 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
324 * This is the actual input entry point.
326 * For transport mode and equivalent this would be identical to
327 * input2 (which does not need to be set). While tunnel mode
328 * and equivalent would set this to the tunnel encapsulation function
329 * xfrm4_prepare_input that would in turn call input2.
331 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
334 * Add encapsulation header.
336 * On exit, the transport header will be set to the start of the
337 * encapsulation header to be filled in by x->type->output and
338 * the mac header will be set to the nextheader (protocol for
339 * IPv4) field of the extension header directly preceding the
340 * encapsulation header, or in its absence, that of the top IP
341 * header. The value of the network header will always point
342 * to the top IP header while skb->data will point to the payload.
344 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
347 * This is the actual output entry point.
349 * For transport mode and equivalent this would be identical to
350 * output2 (which does not need to be set). While tunnel mode
351 * and equivalent would set this to a tunnel encapsulation function
352 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
355 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
357 struct xfrm_state_afinfo *afinfo;
358 struct module *owner;
363 /* Flags for xfrm_mode. */
365 XFRM_MODE_FLAG_TUNNEL = 1,
368 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
369 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
373 /* id in template is interpreted as:
374 * daddr - destination of tunnel, may be zero for transport mode.
375 * spi - zero to acquire spi. Not zero if spi is static, then
376 * daddr must be fixed too.
377 * proto - AH/ESP/IPCOMP
381 /* Source address of tunnel. Ignored, if it is not a tunnel. */
382 xfrm_address_t saddr;
384 unsigned short encap_family;
388 /* Mode: transport, tunnel etc. */
391 /* Sharing mode: unique, this session only, this user only etc. */
394 /* May skip this transfomration if no SA is found */
397 /* Bit mask of algos allowed for acquisition */
403 #define XFRM_MAX_DEPTH 6
407 struct xfrm_policy *next;
408 struct hlist_node bydst;
409 struct hlist_node byidx;
411 /* This lock only affects elements except for entry. */
414 struct timer_list timer;
418 struct xfrm_selector selector;
419 struct xfrm_lifetime_cfg lft;
420 struct xfrm_lifetime_cur curlft;
421 struct dst_entry *bundles;
428 /* XXX 1 byte hole, try to pack */
429 struct xfrm_sec_ctx *security;
430 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
433 struct xfrm_migrate {
434 xfrm_address_t old_daddr;
435 xfrm_address_t old_saddr;
436 xfrm_address_t new_daddr;
437 xfrm_address_t new_saddr;
446 #define XFRM_KM_TIMEOUT 30
448 #define XFRM_REPLAY_SEQ 1
449 #define XFRM_REPLAY_OSEQ 2
450 #define XFRM_REPLAY_SEQ_MASK 3
452 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
453 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
455 /* default aevent timeout in units of 100ms */
456 #define XFRM_AE_ETIME 10
457 /* Async Event timer multiplier */
458 #define XFRM_AE_ETH_M 10
459 /* default seq threshold size */
460 #define XFRM_AE_SEQT_SIZE 2
464 struct list_head list;
466 int (*notify)(struct xfrm_state *x, struct km_event *c);
467 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
468 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
469 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
470 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
471 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
472 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
475 extern int xfrm_register_km(struct xfrm_mgr *km);
476 extern int xfrm_unregister_km(struct xfrm_mgr *km);
478 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
481 * This structure is used for the duration where packets are being
482 * transformed by IPsec. As soon as the packet leaves IPsec the
483 * area beyond the generic IP part may be overwritten.
487 struct inet_skb_parm h4;
488 struct inet6_skb_parm h6;
491 /* Sequence number for replay protection. */
495 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
498 * This structure is used by the afinfo prepare_input/prepare_output functions
499 * to transmit header information to the mode input/output functions.
501 struct xfrm_mode_skb_cb {
503 struct inet_skb_parm h4;
504 struct inet6_skb_parm h6;
507 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
511 /* TOS for IPv4, class for IPv6. */
514 /* TTL for IPv4, hop limitfor IPv6. */
517 /* Protocol for IPv4, NH for IPv6. */
520 /* Used by IPv6 only, zero for IPv4. */
524 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
527 * This structure is used by the input processing to locate the SPI and
528 * related information.
530 struct xfrm_spi_skb_cb {
532 struct inet_skb_parm h4;
533 struct inet6_skb_parm h6;
536 unsigned int daddroff;
540 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
542 /* Audit Information */
549 #ifdef CONFIG_AUDITSYSCALL
550 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
552 struct audit_buffer *audit_buf = NULL;
556 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
557 AUDIT_MAC_IPSEC_EVENT);
558 if (audit_buf == NULL)
561 audit_log_format(audit_buf, "auid=%u", auid);
564 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
565 audit_log_format(audit_buf, " subj=%s", secctx);
566 security_release_secctx(secctx, secctx_len);
568 audit_log_task_context(audit_buf);
572 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
574 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
576 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
578 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
581 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
582 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
583 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
584 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
585 #endif /* CONFIG_AUDITSYSCALL */
587 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
589 if (likely(policy != NULL))
590 atomic_inc(&policy->refcnt);
593 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
595 static inline void xfrm_pol_put(struct xfrm_policy *policy)
597 if (atomic_dec_and_test(&policy->refcnt))
598 __xfrm_policy_destroy(policy);
601 #ifdef CONFIG_XFRM_SUB_POLICY
602 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
605 for (i = npols - 1; i >= 0; --i)
606 xfrm_pol_put(pols[i]);
609 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
611 xfrm_pol_put(pols[0]);
615 extern void __xfrm_state_destroy(struct xfrm_state *);
617 static inline void __xfrm_state_put(struct xfrm_state *x)
619 atomic_dec(&x->refcnt);
622 static inline void xfrm_state_put(struct xfrm_state *x)
624 if (atomic_dec_and_test(&x->refcnt))
625 __xfrm_state_destroy(x);
628 static inline void xfrm_state_hold(struct xfrm_state *x)
630 atomic_inc(&x->refcnt);
633 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
640 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
641 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
644 if (memcmp(a1, a2, pdw << 2))
650 mask = htonl((0xffffffff) << (32 - pbi));
652 if ((a1[pdw] ^ a2[pdw]) & mask)
660 __be16 xfrm_flowi_sport(struct flowi *fl)
666 case IPPROTO_UDPLITE:
668 port = fl->fl_ip_sport;
672 port = htons(fl->fl_icmp_type);
675 port = htons(fl->fl_mh_type);
684 __be16 xfrm_flowi_dport(struct flowi *fl)
690 case IPPROTO_UDPLITE:
692 port = fl->fl_ip_dport;
696 port = htons(fl->fl_icmp_code);
704 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
705 unsigned short family);
707 #ifdef CONFIG_SECURITY_NETWORK_XFRM
708 /* If neither has a context --> match
709 * Otherwise, both must have a context and the sids, doi, alg must match
711 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
713 return ((!s1 && !s2) ||
715 (s1->ctx_sid == s2->ctx_sid) &&
716 (s1->ctx_doi == s2->ctx_doi) &&
717 (s1->ctx_alg == s2->ctx_alg)));
720 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
726 /* A struct encoding bundle of transformations to apply to some set of flow.
728 * dst->child points to the next element of bundle.
729 * dst->xfrm points to an instanse of transformer.
731 * Due to unfortunate limitations of current routing cache, which we
732 * have no time to fix, it mirrors struct rtable and bound to the same
733 * routing key, including saddr,daddr. However, we can have many of
734 * bundles differing by session id. All the bundles grow from a parent
740 struct dst_entry dst;
744 struct dst_entry *route;
745 #ifdef CONFIG_XFRM_SUB_POLICY
746 struct flowi *origin;
747 struct xfrm_selector *partner;
750 u32 route_mtu_cached;
751 u32 child_mtu_cached;
756 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
758 dst_release(xdst->route);
759 if (likely(xdst->u.dst.xfrm))
760 xfrm_state_put(xdst->u.dst.xfrm);
761 #ifdef CONFIG_XFRM_SUB_POLICY
764 kfree(xdst->partner);
765 xdst->partner = NULL;
769 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
775 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
778 static inline struct sec_path *
779 secpath_get(struct sec_path *sp)
782 atomic_inc(&sp->refcnt);
786 extern void __secpath_destroy(struct sec_path *sp);
789 secpath_put(struct sec_path *sp)
791 if (sp && atomic_dec_and_test(&sp->refcnt))
792 __secpath_destroy(sp);
795 extern struct sec_path *secpath_dup(struct sec_path *src);
798 secpath_reset(struct sk_buff *skb)
801 secpath_put(skb->sp);
807 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
811 return addr->a4 == 0;
813 return ipv6_addr_any((struct in6_addr *)&addr->a6);
819 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
821 return (tmpl->saddr.a4 &&
822 tmpl->saddr.a4 != x->props.saddr.a4);
826 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
828 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
829 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
833 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
837 return __xfrm4_state_addr_cmp(tmpl, x);
839 return __xfrm6_state_addr_cmp(tmpl, x);
845 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
847 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
849 if (sk && sk->sk_policy[XFRM_POLICY_IN])
850 return __xfrm_policy_check(sk, dir, skb, family);
852 return (!xfrm_policy_count[dir] && !skb->sp) ||
853 (skb->dst->flags & DST_NOPOLICY) ||
854 __xfrm_policy_check(sk, dir, skb, family);
857 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
859 return xfrm_policy_check(sk, dir, skb, AF_INET);
862 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
864 return xfrm_policy_check(sk, dir, skb, AF_INET6);
867 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
868 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
870 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
872 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
873 (skb->dst->flags & DST_NOXFRM) ||
874 __xfrm_route_forward(skb, family);
877 static inline int xfrm4_route_forward(struct sk_buff *skb)
879 return xfrm_route_forward(skb, AF_INET);
882 static inline int xfrm6_route_forward(struct sk_buff *skb)
884 return xfrm_route_forward(skb, AF_INET6);
887 extern int __xfrm_sk_clone_policy(struct sock *sk);
889 static inline int xfrm_sk_clone_policy(struct sock *sk)
891 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
892 return __xfrm_sk_clone_policy(sk);
896 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
898 static inline void xfrm_sk_free_policy(struct sock *sk)
900 if (unlikely(sk->sk_policy[0] != NULL)) {
901 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
902 sk->sk_policy[0] = NULL;
904 if (unlikely(sk->sk_policy[1] != NULL)) {
905 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
906 sk->sk_policy[1] = NULL;
912 static inline void xfrm_sk_free_policy(struct sock *sk) {}
913 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
914 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
915 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
916 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
920 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
924 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
931 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
935 return (xfrm_address_t *)&fl->fl4_dst;
937 return (xfrm_address_t *)&fl->fl6_dst;
943 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
947 return (xfrm_address_t *)&fl->fl4_src;
949 return (xfrm_address_t *)&fl->fl6_src;
954 static __inline__ int
955 __xfrm4_state_addr_check(struct xfrm_state *x,
956 xfrm_address_t *daddr, xfrm_address_t *saddr)
958 if (daddr->a4 == x->id.daddr.a4 &&
959 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
964 static __inline__ int
965 __xfrm6_state_addr_check(struct xfrm_state *x,
966 xfrm_address_t *daddr, xfrm_address_t *saddr)
968 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
969 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
970 ipv6_addr_any((struct in6_addr *)saddr) ||
971 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
976 static __inline__ int
977 xfrm_state_addr_check(struct xfrm_state *x,
978 xfrm_address_t *daddr, xfrm_address_t *saddr,
979 unsigned short family)
983 return __xfrm4_state_addr_check(x, daddr, saddr);
985 return __xfrm6_state_addr_check(x, daddr, saddr);
990 static __inline__ int
991 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
992 unsigned short family)
996 return __xfrm4_state_addr_check(x,
997 (xfrm_address_t *)&fl->fl4_dst,
998 (xfrm_address_t *)&fl->fl4_src);
1000 return __xfrm6_state_addr_check(x,
1001 (xfrm_address_t *)&fl->fl6_dst,
1002 (xfrm_address_t *)&fl->fl6_src);
1007 static inline int xfrm_state_kern(struct xfrm_state *x)
1009 return atomic_read(&x->tunnel_users);
1012 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1014 return (!userproto || proto == userproto ||
1015 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1016 proto == IPPROTO_ESP ||
1017 proto == IPPROTO_COMP)));
1021 * xfrm algorithm information
1023 struct xfrm_algo_auth_info {
1028 struct xfrm_algo_encr_info {
1033 struct xfrm_algo_comp_info {
1037 struct xfrm_algo_desc {
1042 struct xfrm_algo_auth_info auth;
1043 struct xfrm_algo_encr_info encr;
1044 struct xfrm_algo_comp_info comp;
1046 struct sadb_alg desc;
1049 /* XFRM tunnel handlers. */
1050 struct xfrm_tunnel {
1051 int (*handler)(struct sk_buff *skb);
1052 int (*err_handler)(struct sk_buff *skb, __u32 info);
1054 struct xfrm_tunnel *next;
1058 struct xfrm6_tunnel {
1059 int (*handler)(struct sk_buff *skb);
1060 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1061 int type, int code, int offset, __be32 info);
1062 struct xfrm6_tunnel *next;
1066 extern void xfrm_init(void);
1067 extern void xfrm4_init(void);
1068 extern void xfrm_state_init(void);
1069 extern void xfrm4_state_init(void);
1071 extern int xfrm6_init(void);
1072 extern void xfrm6_fini(void);
1073 extern int xfrm6_state_init(void);
1074 extern void xfrm6_state_fini(void);
1076 static inline int xfrm6_init(void)
1080 static inline void xfrm6_fini(void)
1086 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1087 extern struct xfrm_state *xfrm_state_alloc(void);
1088 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1089 struct flowi *fl, struct xfrm_tmpl *tmpl,
1090 struct xfrm_policy *pol, int *err,
1091 unsigned short family);
1092 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1093 xfrm_address_t *saddr,
1094 unsigned short family,
1095 u8 mode, u8 proto, u32 reqid);
1096 extern int xfrm_state_check_expire(struct xfrm_state *x);
1097 extern void xfrm_state_insert(struct xfrm_state *x);
1098 extern int xfrm_state_add(struct xfrm_state *x);
1099 extern int xfrm_state_update(struct xfrm_state *x);
1100 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1101 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1102 #ifdef CONFIG_XFRM_SUB_POLICY
1103 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1104 int n, unsigned short family);
1105 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1106 int n, unsigned short family);
1108 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1109 int n, unsigned short family)
1114 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1115 int n, unsigned short family)
1121 struct xfrmk_sadinfo {
1122 u32 sadhcnt; /* current hash bkts */
1123 u32 sadhmcnt; /* max allowed hash bkts */
1124 u32 sadcnt; /* current running count */
1127 struct xfrmk_spdinfo {
1138 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1139 extern int xfrm_state_delete(struct xfrm_state *x);
1140 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1141 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1142 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1143 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1144 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1145 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1146 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1147 extern int xfrm_init_state(struct xfrm_state *x);
1148 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1149 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1151 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1152 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1153 extern int xfrm_output(struct sk_buff *skb);
1154 extern int xfrm4_extract_header(struct sk_buff *skb);
1155 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1156 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1158 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1159 extern int xfrm4_rcv(struct sk_buff *skb);
1161 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1163 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1166 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1167 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1168 extern int xfrm4_output(struct sk_buff *skb);
1169 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1170 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1171 extern int xfrm6_extract_header(struct sk_buff *skb);
1172 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1173 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1174 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1175 extern int xfrm6_rcv(struct sk_buff *skb);
1176 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1177 xfrm_address_t *saddr, u8 proto);
1178 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1179 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1180 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1181 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1182 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1183 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1184 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1185 extern int xfrm6_output(struct sk_buff *skb);
1186 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1190 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1191 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1193 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1195 return -ENOPROTOOPT;
1198 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1200 /* should not happen */
1206 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1207 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1208 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1209 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1210 struct xfrm_selector *sel,
1211 struct xfrm_sec_ctx *ctx, int delete,
1213 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1214 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1215 u32 xfrm_get_acqseq(void);
1216 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1217 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1218 xfrm_address_t *daddr, xfrm_address_t *saddr,
1219 int create, unsigned short family);
1220 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1221 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1222 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1223 struct flowi *fl, int family, int strict);
1225 #ifdef CONFIG_XFRM_MIGRATE
1226 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1227 struct xfrm_migrate *m, int num_bundles);
1228 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1229 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1230 struct xfrm_migrate *m);
1231 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1232 struct xfrm_migrate *m, int num_bundles);
1235 extern wait_queue_head_t km_waitq;
1236 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1237 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1238 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1240 extern void xfrm_input_init(void);
1241 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1243 extern void xfrm_probe_algs(void);
1244 extern int xfrm_count_auth_supported(void);
1245 extern int xfrm_count_enc_supported(void);
1246 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1247 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1248 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1249 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1250 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1251 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1252 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1253 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1257 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1260 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1261 int offset, int len, icv_update_fn_t icv_update);
1263 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1269 return (__force __u32)a->a4 - (__force __u32)b->a4;
1271 return ipv6_addr_cmp((struct in6_addr *)a,
1272 (struct in6_addr *)b);
1276 static inline int xfrm_policy_id2dir(u32 index)
1281 static inline int xfrm_aevent_is_on(void)
1287 nlsk = rcu_dereference(xfrm_nl);
1289 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1294 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1296 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1299 #ifdef CONFIG_XFRM_MIGRATE
1300 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1302 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1305 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1308 for (i = 0; i < n; i++)
1309 xfrm_state_put(*(states + i));
1312 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1315 for (i = 0; i < n; i++)
1316 xfrm_state_delete(*(states + i));
1320 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1322 return skb->sp->xvec[skb->sp->len - 1];
1325 #endif /* _NET_XFRM_H */