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;
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 unsigned int nf_post_routing;
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);
279 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
280 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
282 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
287 struct module *owner;
290 #define XFRM_TYPE_NON_FRAGMENT 1
291 #define XFRM_TYPE_REPLAY_PROT 2
292 #define XFRM_TYPE_LOCAL_COADDR 4
293 #define XFRM_TYPE_REMOTE_COADDR 8
295 int (*init_state)(struct xfrm_state *x);
296 void (*destructor)(struct xfrm_state *);
297 int (*input)(struct xfrm_state *, struct sk_buff *skb);
298 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
299 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
300 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
301 /* Estimate maximal size of result of transformation of a dgram */
302 u32 (*get_mtu)(struct xfrm_state *, int size);
305 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
306 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
310 * Remove encapsulation header.
312 * The IP header will be moved over the top of the encapsulation
315 * On entry, the transport header shall point to where the IP header
316 * should be and the network header shall be set to where the IP
317 * header currently is. skb->data shall point to the start of the
320 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
323 * This is the actual input entry point.
325 * For transport mode and equivalent this would be identical to
326 * input2 (which does not need to be set). While tunnel mode
327 * and equivalent would set this to the tunnel encapsulation function
328 * xfrm4_prepare_input that would in turn call input2.
330 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
333 * Add encapsulation header.
335 * On exit, the transport header will be set to the start of the
336 * encapsulation header to be filled in by x->type->output and
337 * the mac header will be set to the nextheader (protocol for
338 * IPv4) field of the extension header directly preceding the
339 * encapsulation header, or in its absence, that of the top IP
340 * header. The value of the network header will always point
341 * to the top IP header while skb->data will point to the payload.
343 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
346 * This is the actual output entry point.
348 * For transport mode and equivalent this would be identical to
349 * output2 (which does not need to be set). While tunnel mode
350 * and equivalent would set this to a tunnel encapsulation function
351 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
354 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
356 struct xfrm_state_afinfo *afinfo;
357 struct module *owner;
362 /* Flags for xfrm_mode. */
364 XFRM_MODE_FLAG_TUNNEL = 1,
367 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
368 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
372 /* id in template is interpreted as:
373 * daddr - destination of tunnel, may be zero for transport mode.
374 * spi - zero to acquire spi. Not zero if spi is static, then
375 * daddr must be fixed too.
376 * proto - AH/ESP/IPCOMP
380 /* Source address of tunnel. Ignored, if it is not a tunnel. */
381 xfrm_address_t saddr;
383 unsigned short encap_family;
387 /* Mode: transport, tunnel etc. */
390 /* Sharing mode: unique, this session only, this user only etc. */
393 /* May skip this transfomration if no SA is found */
396 /* Bit mask of algos allowed for acquisition */
402 #define XFRM_MAX_DEPTH 6
406 struct xfrm_policy *next;
407 struct hlist_node bydst;
408 struct hlist_node byidx;
410 /* This lock only affects elements except for entry. */
413 struct timer_list timer;
417 struct xfrm_selector selector;
418 struct xfrm_lifetime_cfg lft;
419 struct xfrm_lifetime_cur curlft;
420 struct dst_entry *bundles;
427 /* XXX 1 byte hole, try to pack */
428 struct xfrm_sec_ctx *security;
429 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
432 struct xfrm_migrate {
433 xfrm_address_t old_daddr;
434 xfrm_address_t old_saddr;
435 xfrm_address_t new_daddr;
436 xfrm_address_t new_saddr;
445 #define XFRM_KM_TIMEOUT 30
447 #define XFRM_REPLAY_SEQ 1
448 #define XFRM_REPLAY_OSEQ 2
449 #define XFRM_REPLAY_SEQ_MASK 3
451 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
452 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
454 /* default aevent timeout in units of 100ms */
455 #define XFRM_AE_ETIME 10
456 /* Async Event timer multiplier */
457 #define XFRM_AE_ETH_M 10
458 /* default seq threshold size */
459 #define XFRM_AE_SEQT_SIZE 2
463 struct list_head list;
465 int (*notify)(struct xfrm_state *x, struct km_event *c);
466 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
467 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
468 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
469 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
470 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
471 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
474 extern int xfrm_register_km(struct xfrm_mgr *km);
475 extern int xfrm_unregister_km(struct xfrm_mgr *km);
477 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
480 * This structure is used for the duration where packets are being
481 * transformed by IPsec. As soon as the packet leaves IPsec the
482 * area beyond the generic IP part may be overwritten.
486 struct inet_skb_parm h4;
487 struct inet6_skb_parm h6;
490 /* Sequence number for replay protection. */
494 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
497 * This structure is used by the afinfo prepare_input/prepare_output functions
498 * to transmit header information to the mode input/output functions.
500 struct xfrm_mode_skb_cb {
502 struct inet_skb_parm h4;
503 struct inet6_skb_parm h6;
506 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
510 /* TOS for IPv4, class for IPv6. */
513 /* TTL for IPv4, hop limitfor IPv6. */
516 /* Protocol for IPv4, NH for IPv6. */
519 /* Used by IPv6 only, zero for IPv4. */
523 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
525 /* Audit Information */
532 #ifdef CONFIG_AUDITSYSCALL
533 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
535 struct audit_buffer *audit_buf = NULL;
539 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
540 AUDIT_MAC_IPSEC_EVENT);
541 if (audit_buf == NULL)
544 audit_log_format(audit_buf, "auid=%u", auid);
547 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
548 audit_log_format(audit_buf, " subj=%s", secctx);
549 security_release_secctx(secctx, secctx_len);
551 audit_log_task_context(audit_buf);
555 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
557 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
559 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
561 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
564 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
565 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
566 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
567 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
568 #endif /* CONFIG_AUDITSYSCALL */
570 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
572 if (likely(policy != NULL))
573 atomic_inc(&policy->refcnt);
576 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
578 static inline void xfrm_pol_put(struct xfrm_policy *policy)
580 if (atomic_dec_and_test(&policy->refcnt))
581 __xfrm_policy_destroy(policy);
584 #ifdef CONFIG_XFRM_SUB_POLICY
585 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
588 for (i = npols - 1; i >= 0; --i)
589 xfrm_pol_put(pols[i]);
592 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
594 xfrm_pol_put(pols[0]);
598 extern void __xfrm_state_destroy(struct xfrm_state *);
600 static inline void __xfrm_state_put(struct xfrm_state *x)
602 atomic_dec(&x->refcnt);
605 static inline void xfrm_state_put(struct xfrm_state *x)
607 if (atomic_dec_and_test(&x->refcnt))
608 __xfrm_state_destroy(x);
611 static inline void xfrm_state_hold(struct xfrm_state *x)
613 atomic_inc(&x->refcnt);
616 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
623 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
624 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
627 if (memcmp(a1, a2, pdw << 2))
633 mask = htonl((0xffffffff) << (32 - pbi));
635 if ((a1[pdw] ^ a2[pdw]) & mask)
643 __be16 xfrm_flowi_sport(struct flowi *fl)
649 case IPPROTO_UDPLITE:
651 port = fl->fl_ip_sport;
655 port = htons(fl->fl_icmp_type);
658 port = htons(fl->fl_mh_type);
667 __be16 xfrm_flowi_dport(struct flowi *fl)
673 case IPPROTO_UDPLITE:
675 port = fl->fl_ip_dport;
679 port = htons(fl->fl_icmp_code);
687 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
688 unsigned short family);
690 #ifdef CONFIG_SECURITY_NETWORK_XFRM
691 /* If neither has a context --> match
692 * Otherwise, both must have a context and the sids, doi, alg must match
694 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
696 return ((!s1 && !s2) ||
698 (s1->ctx_sid == s2->ctx_sid) &&
699 (s1->ctx_doi == s2->ctx_doi) &&
700 (s1->ctx_alg == s2->ctx_alg)));
703 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
709 /* A struct encoding bundle of transformations to apply to some set of flow.
711 * dst->child points to the next element of bundle.
712 * dst->xfrm points to an instanse of transformer.
714 * Due to unfortunate limitations of current routing cache, which we
715 * have no time to fix, it mirrors struct rtable and bound to the same
716 * routing key, including saddr,daddr. However, we can have many of
717 * bundles differing by session id. All the bundles grow from a parent
723 struct dst_entry dst;
727 struct dst_entry *route;
728 #ifdef CONFIG_XFRM_SUB_POLICY
729 struct flowi *origin;
730 struct xfrm_selector *partner;
733 u32 route_mtu_cached;
734 u32 child_mtu_cached;
739 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
741 dst_release(xdst->route);
742 if (likely(xdst->u.dst.xfrm))
743 xfrm_state_put(xdst->u.dst.xfrm);
744 #ifdef CONFIG_XFRM_SUB_POLICY
747 kfree(xdst->partner);
748 xdst->partner = NULL;
752 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
758 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
761 static inline struct sec_path *
762 secpath_get(struct sec_path *sp)
765 atomic_inc(&sp->refcnt);
769 extern void __secpath_destroy(struct sec_path *sp);
772 secpath_put(struct sec_path *sp)
774 if (sp && atomic_dec_and_test(&sp->refcnt))
775 __secpath_destroy(sp);
778 extern struct sec_path *secpath_dup(struct sec_path *src);
781 secpath_reset(struct sk_buff *skb)
784 secpath_put(skb->sp);
790 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
794 return addr->a4 == 0;
796 return ipv6_addr_any((struct in6_addr *)&addr->a6);
802 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
804 return (tmpl->saddr.a4 &&
805 tmpl->saddr.a4 != x->props.saddr.a4);
809 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
811 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
812 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
816 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
820 return __xfrm4_state_addr_cmp(tmpl, x);
822 return __xfrm6_state_addr_cmp(tmpl, x);
829 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
831 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
833 if (sk && sk->sk_policy[XFRM_POLICY_IN])
834 return __xfrm_policy_check(sk, dir, skb, family);
836 return (!xfrm_policy_count[dir] && !skb->sp) ||
837 (skb->dst->flags & DST_NOPOLICY) ||
838 __xfrm_policy_check(sk, dir, skb, family);
841 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
843 return xfrm_policy_check(sk, dir, skb, AF_INET);
846 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
848 return xfrm_policy_check(sk, dir, skb, AF_INET6);
851 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
852 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
854 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
856 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
857 (skb->dst->flags & DST_NOXFRM) ||
858 __xfrm_route_forward(skb, family);
861 static inline int xfrm4_route_forward(struct sk_buff *skb)
863 return xfrm_route_forward(skb, AF_INET);
866 static inline int xfrm6_route_forward(struct sk_buff *skb)
868 return xfrm_route_forward(skb, AF_INET6);
871 extern int __xfrm_sk_clone_policy(struct sock *sk);
873 static inline int xfrm_sk_clone_policy(struct sock *sk)
875 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
876 return __xfrm_sk_clone_policy(sk);
880 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
882 static inline void xfrm_sk_free_policy(struct sock *sk)
884 if (unlikely(sk->sk_policy[0] != NULL)) {
885 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
886 sk->sk_policy[0] = NULL;
888 if (unlikely(sk->sk_policy[1] != NULL)) {
889 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
890 sk->sk_policy[1] = NULL;
896 static inline void xfrm_sk_free_policy(struct sock *sk) {}
897 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
898 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
899 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
900 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
904 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
908 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
915 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
919 return (xfrm_address_t *)&fl->fl4_dst;
921 return (xfrm_address_t *)&fl->fl6_dst;
927 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
931 return (xfrm_address_t *)&fl->fl4_src;
933 return (xfrm_address_t *)&fl->fl6_src;
938 static __inline__ int
939 __xfrm4_state_addr_check(struct xfrm_state *x,
940 xfrm_address_t *daddr, xfrm_address_t *saddr)
942 if (daddr->a4 == x->id.daddr.a4 &&
943 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
948 static __inline__ int
949 __xfrm6_state_addr_check(struct xfrm_state *x,
950 xfrm_address_t *daddr, xfrm_address_t *saddr)
952 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
953 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
954 ipv6_addr_any((struct in6_addr *)saddr) ||
955 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
960 static __inline__ int
961 xfrm_state_addr_check(struct xfrm_state *x,
962 xfrm_address_t *daddr, xfrm_address_t *saddr,
963 unsigned short family)
967 return __xfrm4_state_addr_check(x, daddr, saddr);
969 return __xfrm6_state_addr_check(x, daddr, saddr);
974 static __inline__ int
975 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
976 unsigned short family)
980 return __xfrm4_state_addr_check(x,
981 (xfrm_address_t *)&fl->fl4_dst,
982 (xfrm_address_t *)&fl->fl4_src);
984 return __xfrm6_state_addr_check(x,
985 (xfrm_address_t *)&fl->fl6_dst,
986 (xfrm_address_t *)&fl->fl6_src);
991 static inline int xfrm_state_kern(struct xfrm_state *x)
993 return atomic_read(&x->tunnel_users);
996 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
998 return (!userproto || proto == userproto ||
999 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1000 proto == IPPROTO_ESP ||
1001 proto == IPPROTO_COMP)));
1005 * xfrm algorithm information
1007 struct xfrm_algo_auth_info {
1012 struct xfrm_algo_encr_info {
1017 struct xfrm_algo_comp_info {
1021 struct xfrm_algo_desc {
1026 struct xfrm_algo_auth_info auth;
1027 struct xfrm_algo_encr_info encr;
1028 struct xfrm_algo_comp_info comp;
1030 struct sadb_alg desc;
1033 /* XFRM tunnel handlers. */
1034 struct xfrm_tunnel {
1035 int (*handler)(struct sk_buff *skb);
1036 int (*err_handler)(struct sk_buff *skb, __u32 info);
1038 struct xfrm_tunnel *next;
1042 struct xfrm6_tunnel {
1043 int (*handler)(struct sk_buff *skb);
1044 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1045 int type, int code, int offset, __be32 info);
1046 struct xfrm6_tunnel *next;
1050 extern void xfrm_init(void);
1051 extern void xfrm4_init(void);
1052 extern void xfrm6_init(void);
1053 extern void xfrm6_fini(void);
1054 extern void xfrm_state_init(void);
1055 extern void xfrm4_state_init(void);
1056 extern void xfrm6_state_init(void);
1057 extern void xfrm6_state_fini(void);
1059 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1060 extern struct xfrm_state *xfrm_state_alloc(void);
1061 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1062 struct flowi *fl, struct xfrm_tmpl *tmpl,
1063 struct xfrm_policy *pol, int *err,
1064 unsigned short family);
1065 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1066 xfrm_address_t *saddr,
1067 unsigned short family,
1068 u8 mode, u8 proto, u32 reqid);
1069 extern int xfrm_state_check_expire(struct xfrm_state *x);
1070 extern void xfrm_state_insert(struct xfrm_state *x);
1071 extern int xfrm_state_add(struct xfrm_state *x);
1072 extern int xfrm_state_update(struct xfrm_state *x);
1073 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1074 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1075 #ifdef CONFIG_XFRM_SUB_POLICY
1076 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1077 int n, unsigned short family);
1078 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1079 int n, unsigned short family);
1081 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1082 int n, unsigned short family)
1087 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1088 int n, unsigned short family)
1094 struct xfrmk_sadinfo {
1095 u32 sadhcnt; /* current hash bkts */
1096 u32 sadhmcnt; /* max allowed hash bkts */
1097 u32 sadcnt; /* current running count */
1100 struct xfrmk_spdinfo {
1111 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1112 extern int xfrm_state_delete(struct xfrm_state *x);
1113 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1114 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1115 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1116 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1117 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1118 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1119 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1120 extern int xfrm_init_state(struct xfrm_state *x);
1121 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1122 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1123 extern int xfrm_output(struct sk_buff *skb);
1124 extern int xfrm4_extract_header(struct sk_buff *skb);
1125 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1126 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1128 extern int xfrm4_rcv(struct sk_buff *skb);
1130 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1132 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1135 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1136 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1137 extern int xfrm4_output(struct sk_buff *skb);
1138 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1139 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1140 extern int xfrm6_extract_header(struct sk_buff *skb);
1141 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1142 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1143 extern int xfrm6_rcv(struct sk_buff *skb);
1144 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1145 xfrm_address_t *saddr, u8 proto);
1146 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1147 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1148 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1149 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1150 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1151 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1152 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1153 extern int xfrm6_output(struct sk_buff *skb);
1154 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1158 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1159 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1161 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1163 return -ENOPROTOOPT;
1166 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1168 /* should not happen */
1174 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1175 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1176 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1177 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1178 struct xfrm_selector *sel,
1179 struct xfrm_sec_ctx *ctx, int delete,
1181 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1182 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1183 u32 xfrm_get_acqseq(void);
1184 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1185 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1186 xfrm_address_t *daddr, xfrm_address_t *saddr,
1187 int create, unsigned short family);
1188 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1189 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1190 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1191 struct flowi *fl, int family, int strict);
1193 #ifdef CONFIG_XFRM_MIGRATE
1194 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1195 struct xfrm_migrate *m, int num_bundles);
1196 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1197 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1198 struct xfrm_migrate *m);
1199 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1200 struct xfrm_migrate *m, int num_bundles);
1203 extern wait_queue_head_t km_waitq;
1204 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1205 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1206 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1208 extern void xfrm_input_init(void);
1209 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1211 extern void xfrm_probe_algs(void);
1212 extern int xfrm_count_auth_supported(void);
1213 extern int xfrm_count_enc_supported(void);
1214 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1215 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1216 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1217 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1218 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1219 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1220 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1221 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1225 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1228 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1229 int offset, int len, icv_update_fn_t icv_update);
1231 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1237 return (__force __u32)a->a4 - (__force __u32)b->a4;
1239 return ipv6_addr_cmp((struct in6_addr *)a,
1240 (struct in6_addr *)b);
1244 static inline int xfrm_policy_id2dir(u32 index)
1249 static inline int xfrm_aevent_is_on(void)
1255 nlsk = rcu_dereference(xfrm_nl);
1257 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1262 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1264 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1267 #ifdef CONFIG_XFRM_MIGRATE
1268 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1270 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1273 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1276 for (i = 0; i < n; i++)
1277 xfrm_state_put(*(states + i));
1280 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1283 for (i = 0; i < n; i++)
1284 xfrm_state_delete(*(states + i));
1288 #endif /* _NET_XFRM_H */