4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
19 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
57 extern struct mutex xfrm_cfg_mutex;
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
73 Lookup is plain linear search until the first match with selector.
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
87 Bundles are cached at xrfm_policy struct (field ->bundles).
90 Resolution of xrfm_tmpl
91 -----------------------
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 /* Full description of state of transformer. */
123 /* Note: bydst is re-used during gc */
124 struct hlist_node bydst;
125 struct hlist_node bysrc;
126 struct hlist_node byspi;
132 struct xfrm_selector sel;
136 /* Key manger bits */
143 /* Parameters of this state. */
148 u8 aalgo, ealgo, calgo;
151 xfrm_address_t saddr;
156 struct xfrm_lifetime_cfg lft;
158 /* Data for transformer */
159 struct xfrm_algo *aalg;
160 struct xfrm_algo *ealg;
161 struct xfrm_algo *calg;
162 struct xfrm_algo_aead *aead;
164 /* Data for encapsulator */
165 struct xfrm_encap_tmpl *encap;
167 /* Data for care-of address */
168 xfrm_address_t *coaddr;
170 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
171 struct xfrm_state *tunnel;
173 /* If a tunnel, number of users + 1 */
174 atomic_t tunnel_users;
176 /* State for replay detection */
177 struct xfrm_replay_state replay;
179 /* Replay detection state at the time we sent the last notification */
180 struct xfrm_replay_state preplay;
182 /* internal flag that only holds state for delayed aevent at the
187 /* Replay detection notification settings */
191 /* Replay detection notification timer */
192 struct timer_list rtimer;
195 struct xfrm_stats stats;
197 struct xfrm_lifetime_cur curlft;
198 struct timer_list timer;
201 unsigned long lastused;
203 /* Reference to data common to all the instances of this
205 const struct xfrm_type *type;
206 struct xfrm_mode *inner_mode;
207 struct xfrm_mode *outer_mode;
209 /* Security context */
210 struct xfrm_sec_ctx *security;
212 /* Private data of this transformer, format is opaque,
213 * interpreted by xfrm_type methods. */
217 /* xflags - make enum if more show up */
218 #define XFRM_TIME_DEFER 1
229 /* callback structure passed from either netlink or pfkey */
248 struct xfrm_policy_afinfo {
249 unsigned short family;
250 struct dst_ops *dst_ops;
251 void (*garbage_collect)(void);
252 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
253 xfrm_address_t *daddr);
254 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
255 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
256 void (*decode_session)(struct sk_buff *skb,
259 int (*get_tos)(struct flowi *fl);
260 int (*init_path)(struct xfrm_dst *path,
261 struct dst_entry *dst,
263 int (*fill_dst)(struct xfrm_dst *xdst,
264 struct net_device *dev);
267 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
268 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
269 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
270 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
273 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
274 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
275 extern int __xfrm_state_delete(struct xfrm_state *x);
277 struct xfrm_state_afinfo {
280 unsigned int eth_proto;
281 struct module *owner;
282 const struct xfrm_type *type_map[IPPROTO_MAX];
283 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
284 int (*init_flags)(struct xfrm_state *x);
285 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
286 struct xfrm_tmpl *tmpl,
287 xfrm_address_t *daddr, xfrm_address_t *saddr);
288 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
289 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
290 int (*output)(struct sk_buff *skb);
291 int (*extract_input)(struct xfrm_state *x,
292 struct sk_buff *skb);
293 int (*extract_output)(struct xfrm_state *x,
294 struct sk_buff *skb);
295 int (*transport_finish)(struct sk_buff *skb,
299 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
300 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
302 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
307 struct module *owner;
310 #define XFRM_TYPE_NON_FRAGMENT 1
311 #define XFRM_TYPE_REPLAY_PROT 2
312 #define XFRM_TYPE_LOCAL_COADDR 4
313 #define XFRM_TYPE_REMOTE_COADDR 8
315 int (*init_state)(struct xfrm_state *x);
316 void (*destructor)(struct xfrm_state *);
317 int (*input)(struct xfrm_state *, struct sk_buff *skb);
318 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
319 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
320 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
321 /* Estimate maximal size of result of transformation of a dgram */
322 u32 (*get_mtu)(struct xfrm_state *, int size);
325 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
326 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
330 * Remove encapsulation header.
332 * The IP header will be moved over the top of the encapsulation
335 * On entry, the transport header shall point to where the IP header
336 * should be and the network header shall be set to where the IP
337 * header currently is. skb->data shall point to the start of the
340 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
343 * This is the actual input entry point.
345 * For transport mode and equivalent this would be identical to
346 * input2 (which does not need to be set). While tunnel mode
347 * and equivalent would set this to the tunnel encapsulation function
348 * xfrm4_prepare_input that would in turn call input2.
350 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
353 * Add encapsulation header.
355 * On exit, the transport header will be set to the start of the
356 * encapsulation header to be filled in by x->type->output and
357 * the mac header will be set to the nextheader (protocol for
358 * IPv4) field of the extension header directly preceding the
359 * encapsulation header, or in its absence, that of the top IP
360 * header. The value of the network header will always point
361 * to the top IP header while skb->data will point to the payload.
363 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
366 * This is the actual output entry point.
368 * For transport mode and equivalent this would be identical to
369 * output2 (which does not need to be set). While tunnel mode
370 * and equivalent would set this to a tunnel encapsulation function
371 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
374 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
376 struct xfrm_state_afinfo *afinfo;
377 struct module *owner;
382 /* Flags for xfrm_mode. */
384 XFRM_MODE_FLAG_TUNNEL = 1,
387 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
388 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
392 /* id in template is interpreted as:
393 * daddr - destination of tunnel, may be zero for transport mode.
394 * spi - zero to acquire spi. Not zero if spi is static, then
395 * daddr must be fixed too.
396 * proto - AH/ESP/IPCOMP
400 /* Source address of tunnel. Ignored, if it is not a tunnel. */
401 xfrm_address_t saddr;
403 unsigned short encap_family;
407 /* Mode: transport, tunnel etc. */
410 /* Sharing mode: unique, this session only, this user only etc. */
413 /* May skip this transfomration if no SA is found */
416 /* Bit mask of algos allowed for acquisition */
422 #define XFRM_MAX_DEPTH 6
426 struct xfrm_policy *next;
427 struct hlist_node bydst;
428 struct hlist_node byidx;
430 /* This lock only affects elements except for entry. */
433 struct timer_list timer;
437 struct xfrm_selector selector;
438 struct xfrm_lifetime_cfg lft;
439 struct xfrm_lifetime_cur curlft;
440 struct dst_entry *bundles;
447 /* XXX 1 byte hole, try to pack */
448 struct xfrm_sec_ctx *security;
449 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
452 struct xfrm_migrate {
453 xfrm_address_t old_daddr;
454 xfrm_address_t old_saddr;
455 xfrm_address_t new_daddr;
456 xfrm_address_t new_saddr;
465 #define XFRM_KM_TIMEOUT 30
467 #define XFRM_REPLAY_SEQ 1
468 #define XFRM_REPLAY_OSEQ 2
469 #define XFRM_REPLAY_SEQ_MASK 3
471 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
472 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
474 /* default aevent timeout in units of 100ms */
475 #define XFRM_AE_ETIME 10
476 /* Async Event timer multiplier */
477 #define XFRM_AE_ETH_M 10
478 /* default seq threshold size */
479 #define XFRM_AE_SEQT_SIZE 2
483 struct list_head list;
485 int (*notify)(struct xfrm_state *x, struct km_event *c);
486 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
487 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
488 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
489 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
490 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
491 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
494 extern int xfrm_register_km(struct xfrm_mgr *km);
495 extern int xfrm_unregister_km(struct xfrm_mgr *km);
497 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
500 * This structure is used for the duration where packets are being
501 * transformed by IPsec. As soon as the packet leaves IPsec the
502 * area beyond the generic IP part may be overwritten.
506 struct inet_skb_parm h4;
507 struct inet6_skb_parm h6;
510 /* Sequence number for replay protection. */
517 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
520 * This structure is used by the afinfo prepare_input/prepare_output functions
521 * to transmit header information to the mode input/output functions.
523 struct xfrm_mode_skb_cb {
525 struct inet_skb_parm h4;
526 struct inet6_skb_parm h6;
529 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
533 /* TOS for IPv4, class for IPv6. */
536 /* TTL for IPv4, hop limitfor IPv6. */
539 /* Protocol for IPv4, NH for IPv6. */
542 /* Used by IPv6 only, zero for IPv4. */
546 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
549 * This structure is used by the input processing to locate the SPI and
550 * related information.
552 struct xfrm_spi_skb_cb {
554 struct inet_skb_parm h4;
555 struct inet6_skb_parm h6;
558 unsigned int daddroff;
562 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
564 /* Audit Information */
571 #ifdef CONFIG_AUDITSYSCALL
572 static inline struct audit_buffer *xfrm_audit_start(const char *op)
574 struct audit_buffer *audit_buf = NULL;
576 if (audit_enabled == 0)
578 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
579 AUDIT_MAC_IPSEC_EVENT);
580 if (audit_buf == NULL)
582 audit_log_format(audit_buf, "op=%s", op);
586 static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
587 struct audit_buffer *audit_buf)
592 audit_log_format(audit_buf, " auid=%u", auid);
594 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
595 audit_log_format(audit_buf, " subj=%s", secctx);
596 security_release_secctx(secctx, secctx_len);
598 audit_log_task_context(audit_buf);
601 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
602 u32 auid, u32 secid);
603 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
604 u32 auid, u32 secid);
605 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
606 u32 auid, u32 secid);
607 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
608 u32 auid, u32 secid);
609 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
610 struct sk_buff *skb);
611 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
612 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
613 __be32 net_spi, __be32 net_seq);
614 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
615 struct sk_buff *skb, u8 proto);
617 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
618 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
619 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
620 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
621 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
622 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
623 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
624 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
625 #endif /* CONFIG_AUDITSYSCALL */
627 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
629 if (likely(policy != NULL))
630 atomic_inc(&policy->refcnt);
633 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
635 static inline void xfrm_pol_put(struct xfrm_policy *policy)
637 if (atomic_dec_and_test(&policy->refcnt))
638 xfrm_policy_destroy(policy);
641 #ifdef CONFIG_XFRM_SUB_POLICY
642 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
645 for (i = npols - 1; i >= 0; --i)
646 xfrm_pol_put(pols[i]);
649 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
651 xfrm_pol_put(pols[0]);
655 extern void __xfrm_state_destroy(struct xfrm_state *);
657 static inline void __xfrm_state_put(struct xfrm_state *x)
659 atomic_dec(&x->refcnt);
662 static inline void xfrm_state_put(struct xfrm_state *x)
664 if (atomic_dec_and_test(&x->refcnt))
665 __xfrm_state_destroy(x);
668 static inline void xfrm_state_hold(struct xfrm_state *x)
670 atomic_inc(&x->refcnt);
673 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
680 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
681 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
684 if (memcmp(a1, a2, pdw << 2))
690 mask = htonl((0xffffffff) << (32 - pbi));
692 if ((a1[pdw] ^ a2[pdw]) & mask)
700 __be16 xfrm_flowi_sport(struct flowi *fl)
706 case IPPROTO_UDPLITE:
708 port = fl->fl_ip_sport;
712 port = htons(fl->fl_icmp_type);
715 port = htons(fl->fl_mh_type);
724 __be16 xfrm_flowi_dport(struct flowi *fl)
730 case IPPROTO_UDPLITE:
732 port = fl->fl_ip_dport;
736 port = htons(fl->fl_icmp_code);
744 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
745 unsigned short family);
747 #ifdef CONFIG_SECURITY_NETWORK_XFRM
748 /* If neither has a context --> match
749 * Otherwise, both must have a context and the sids, doi, alg must match
751 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
753 return ((!s1 && !s2) ||
755 (s1->ctx_sid == s2->ctx_sid) &&
756 (s1->ctx_doi == s2->ctx_doi) &&
757 (s1->ctx_alg == s2->ctx_alg)));
760 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
766 /* A struct encoding bundle of transformations to apply to some set of flow.
768 * dst->child points to the next element of bundle.
769 * dst->xfrm points to an instanse of transformer.
771 * Due to unfortunate limitations of current routing cache, which we
772 * have no time to fix, it mirrors struct rtable and bound to the same
773 * routing key, including saddr,daddr. However, we can have many of
774 * bundles differing by session id. All the bundles grow from a parent
780 struct dst_entry dst;
784 struct dst_entry *route;
785 #ifdef CONFIG_XFRM_SUB_POLICY
786 struct flowi *origin;
787 struct xfrm_selector *partner;
790 u32 route_mtu_cached;
791 u32 child_mtu_cached;
796 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
798 dst_release(xdst->route);
799 if (likely(xdst->u.dst.xfrm))
800 xfrm_state_put(xdst->u.dst.xfrm);
801 #ifdef CONFIG_XFRM_SUB_POLICY
804 kfree(xdst->partner);
805 xdst->partner = NULL;
809 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
815 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
818 static inline struct sec_path *
819 secpath_get(struct sec_path *sp)
822 atomic_inc(&sp->refcnt);
826 extern void __secpath_destroy(struct sec_path *sp);
829 secpath_put(struct sec_path *sp)
831 if (sp && atomic_dec_and_test(&sp->refcnt))
832 __secpath_destroy(sp);
835 extern struct sec_path *secpath_dup(struct sec_path *src);
838 secpath_reset(struct sk_buff *skb)
841 secpath_put(skb->sp);
847 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
851 return addr->a4 == 0;
853 return ipv6_addr_any((struct in6_addr *)&addr->a6);
859 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
861 return (tmpl->saddr.a4 &&
862 tmpl->saddr.a4 != x->props.saddr.a4);
866 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
868 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
869 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
873 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
877 return __xfrm4_state_addr_cmp(tmpl, x);
879 return __xfrm6_state_addr_cmp(tmpl, x);
885 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
887 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
889 unsigned int family, int reverse)
891 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
893 if (sk && sk->sk_policy[XFRM_POLICY_IN])
894 return __xfrm_policy_check(sk, ndir, skb, family);
896 return (!xfrm_policy_count[dir] && !skb->sp) ||
897 (skb->dst->flags & DST_NOPOLICY) ||
898 __xfrm_policy_check(sk, ndir, skb, family);
901 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
903 return __xfrm_policy_check2(sk, dir, skb, family, 0);
906 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
908 return xfrm_policy_check(sk, dir, skb, AF_INET);
911 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
913 return xfrm_policy_check(sk, dir, skb, AF_INET6);
916 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
919 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
922 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
925 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
928 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
929 unsigned int family, int reverse);
931 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
934 return __xfrm_decode_session(skb, fl, family, 0);
937 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
941 return __xfrm_decode_session(skb, fl, family, 1);
944 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
946 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
948 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
949 (skb->dst->flags & DST_NOXFRM) ||
950 __xfrm_route_forward(skb, family);
953 static inline int xfrm4_route_forward(struct sk_buff *skb)
955 return xfrm_route_forward(skb, AF_INET);
958 static inline int xfrm6_route_forward(struct sk_buff *skb)
960 return xfrm_route_forward(skb, AF_INET6);
963 extern int __xfrm_sk_clone_policy(struct sock *sk);
965 static inline int xfrm_sk_clone_policy(struct sock *sk)
967 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
968 return __xfrm_sk_clone_policy(sk);
972 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
974 static inline void xfrm_sk_free_policy(struct sock *sk)
976 if (unlikely(sk->sk_policy[0] != NULL)) {
977 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
978 sk->sk_policy[0] = NULL;
980 if (unlikely(sk->sk_policy[1] != NULL)) {
981 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
982 sk->sk_policy[1] = NULL;
988 static inline void xfrm_sk_free_policy(struct sock *sk) {}
989 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
990 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
991 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
992 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
996 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1000 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1004 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1006 unsigned int family)
1010 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1011 struct sk_buff *skb)
1015 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1016 struct sk_buff *skb)
1023 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1027 return (xfrm_address_t *)&fl->fl4_dst;
1029 return (xfrm_address_t *)&fl->fl6_dst;
1035 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1039 return (xfrm_address_t *)&fl->fl4_src;
1041 return (xfrm_address_t *)&fl->fl6_src;
1046 static __inline__ int
1047 __xfrm4_state_addr_check(struct xfrm_state *x,
1048 xfrm_address_t *daddr, xfrm_address_t *saddr)
1050 if (daddr->a4 == x->id.daddr.a4 &&
1051 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1056 static __inline__ int
1057 __xfrm6_state_addr_check(struct xfrm_state *x,
1058 xfrm_address_t *daddr, xfrm_address_t *saddr)
1060 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1061 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1062 ipv6_addr_any((struct in6_addr *)saddr) ||
1063 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1068 static __inline__ int
1069 xfrm_state_addr_check(struct xfrm_state *x,
1070 xfrm_address_t *daddr, xfrm_address_t *saddr,
1071 unsigned short family)
1075 return __xfrm4_state_addr_check(x, daddr, saddr);
1077 return __xfrm6_state_addr_check(x, daddr, saddr);
1082 static __inline__ int
1083 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1084 unsigned short family)
1088 return __xfrm4_state_addr_check(x,
1089 (xfrm_address_t *)&fl->fl4_dst,
1090 (xfrm_address_t *)&fl->fl4_src);
1092 return __xfrm6_state_addr_check(x,
1093 (xfrm_address_t *)&fl->fl6_dst,
1094 (xfrm_address_t *)&fl->fl6_src);
1099 static inline int xfrm_state_kern(struct xfrm_state *x)
1101 return atomic_read(&x->tunnel_users);
1104 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1106 return (!userproto || proto == userproto ||
1107 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1108 proto == IPPROTO_ESP ||
1109 proto == IPPROTO_COMP)));
1113 * xfrm algorithm information
1115 struct xfrm_algo_aead_info {
1119 struct xfrm_algo_auth_info {
1124 struct xfrm_algo_encr_info {
1129 struct xfrm_algo_comp_info {
1133 struct xfrm_algo_desc {
1138 struct xfrm_algo_aead_info aead;
1139 struct xfrm_algo_auth_info auth;
1140 struct xfrm_algo_encr_info encr;
1141 struct xfrm_algo_comp_info comp;
1143 struct sadb_alg desc;
1146 /* XFRM tunnel handlers. */
1147 struct xfrm_tunnel {
1148 int (*handler)(struct sk_buff *skb);
1149 int (*err_handler)(struct sk_buff *skb, __u32 info);
1151 struct xfrm_tunnel *next;
1155 struct xfrm6_tunnel {
1156 int (*handler)(struct sk_buff *skb);
1157 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1158 int type, int code, int offset, __be32 info);
1159 struct xfrm6_tunnel *next;
1163 extern void xfrm_init(void);
1164 extern void xfrm4_init(void);
1165 extern void xfrm_state_init(void);
1166 extern void xfrm4_state_init(void);
1168 extern int xfrm6_init(void);
1169 extern void xfrm6_fini(void);
1170 extern int xfrm6_state_init(void);
1171 extern void xfrm6_state_fini(void);
1173 static inline int xfrm6_init(void)
1177 static inline void xfrm6_fini(void)
1183 #ifdef CONFIG_XFRM_STATISTICS
1184 extern int xfrm_proc_init(void);
1187 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1188 extern struct xfrm_state *xfrm_state_alloc(void);
1189 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1190 struct flowi *fl, struct xfrm_tmpl *tmpl,
1191 struct xfrm_policy *pol, int *err,
1192 unsigned short family);
1193 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1194 xfrm_address_t *saddr,
1195 unsigned short family,
1196 u8 mode, u8 proto, u32 reqid);
1197 extern int xfrm_state_check_expire(struct xfrm_state *x);
1198 extern void xfrm_state_insert(struct xfrm_state *x);
1199 extern int xfrm_state_add(struct xfrm_state *x);
1200 extern int xfrm_state_update(struct xfrm_state *x);
1201 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1202 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1203 #ifdef CONFIG_XFRM_SUB_POLICY
1204 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1205 int n, unsigned short family);
1206 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1207 int n, unsigned short family);
1209 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1210 int n, unsigned short family)
1215 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1216 int n, unsigned short family)
1222 struct xfrmk_sadinfo {
1223 u32 sadhcnt; /* current hash bkts */
1224 u32 sadhmcnt; /* max allowed hash bkts */
1225 u32 sadcnt; /* current running count */
1228 struct xfrmk_spdinfo {
1239 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1240 extern int xfrm_state_delete(struct xfrm_state *x);
1241 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1242 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1243 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1244 extern int xfrm_replay_check(struct xfrm_state *x,
1245 struct sk_buff *skb, __be32 seq);
1246 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1247 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1248 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1249 extern int xfrm_init_state(struct xfrm_state *x);
1250 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1251 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1253 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1254 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1255 extern int xfrm_output(struct sk_buff *skb);
1256 extern int xfrm4_extract_header(struct sk_buff *skb);
1257 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1258 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1260 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1261 extern int xfrm4_rcv(struct sk_buff *skb);
1263 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1265 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1268 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1269 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1270 extern int xfrm4_output(struct sk_buff *skb);
1271 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1272 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1273 extern int xfrm6_extract_header(struct sk_buff *skb);
1274 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1275 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1276 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1277 extern int xfrm6_rcv(struct sk_buff *skb);
1278 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1279 xfrm_address_t *saddr, u8 proto);
1280 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1281 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1282 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1283 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1284 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1285 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1286 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1287 extern int xfrm6_output(struct sk_buff *skb);
1288 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1292 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1293 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1295 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1297 return -ENOPROTOOPT;
1300 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1302 /* should not happen */
1308 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1309 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1310 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1311 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1312 struct xfrm_selector *sel,
1313 struct xfrm_sec_ctx *ctx, int delete,
1315 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1316 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1317 u32 xfrm_get_acqseq(void);
1318 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1319 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1320 xfrm_address_t *daddr, xfrm_address_t *saddr,
1321 int create, unsigned short family);
1322 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1323 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1324 struct flowi *fl, int family, int strict);
1326 #ifdef CONFIG_XFRM_MIGRATE
1327 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1328 struct xfrm_migrate *m, int num_bundles);
1329 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1330 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1331 struct xfrm_migrate *m);
1332 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1333 struct xfrm_migrate *m, int num_bundles);
1336 extern wait_queue_head_t km_waitq;
1337 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1338 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1339 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1341 extern void xfrm_input_init(void);
1342 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1344 extern void xfrm_probe_algs(void);
1345 extern int xfrm_count_auth_supported(void);
1346 extern int xfrm_count_enc_supported(void);
1347 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1348 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1349 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1350 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1351 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1352 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1353 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1354 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1355 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1360 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1363 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1364 int offset, int len, icv_update_fn_t icv_update);
1366 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1372 return (__force __u32)a->a4 - (__force __u32)b->a4;
1374 return ipv6_addr_cmp((struct in6_addr *)a,
1375 (struct in6_addr *)b);
1379 static inline int xfrm_policy_id2dir(u32 index)
1384 static inline int xfrm_aevent_is_on(void)
1390 nlsk = rcu_dereference(xfrm_nl);
1392 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1397 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1399 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1402 #ifdef CONFIG_XFRM_MIGRATE
1403 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1405 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1408 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1411 for (i = 0; i < n; i++)
1412 xfrm_state_put(*(states + i));
1415 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1418 for (i = 0; i < n; i++)
1419 xfrm_state_delete(*(states + i));
1423 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1425 return skb->sp->xvec[skb->sp->len - 1];
1428 #endif /* _NET_XFRM_H */