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>
15 #include <linux/slab.h>
20 #include <net/route.h>
22 #include <net/ip6_fib.h>
25 #include <linux/interrupt.h>
27 #ifdef CONFIG_XFRM_STATISTICS
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
56 extern struct mutex xfrm_cfg_mutex;
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72 Lookup is plain linear search until the first match with selector.
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
86 Bundles are cached at xrfm_policy struct (field ->bundles).
89 Resolution of xrfm_tmpl
90 -----------------------
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
119 struct xfrm_state_walk {
120 struct list_head all;
129 /* Full description of state of transformer. */
135 struct hlist_node gclist;
136 struct hlist_node bydst;
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
151 /* Key manager bits */
152 struct xfrm_state_walk km;
154 /* Parameters of this state. */
159 u8 aalgo, ealgo, calgo;
162 xfrm_address_t saddr;
167 struct xfrm_lifetime_cfg lft;
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
198 /* internal flag that only holds state for delayed aevent at the
203 /* Replay detection notification settings */
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
211 struct xfrm_stats stats;
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
217 unsigned long lastused;
219 /* Reference to data common to all the instances of this
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
226 /* Security context */
227 struct xfrm_sec_ctx *security;
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
234 static inline struct net *xs_net(struct xfrm_state *x)
236 return read_pnet(&x->xs_net);
239 /* xflags - make enum if more show up */
240 #define XFRM_TIME_DEFER 1
251 /* callback structure passed from either netlink or pfkey */
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
272 int (*recheck)(struct xfrm_state *x,
275 void (*notify)(struct xfrm_state *x, int event);
276 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
282 struct xfrm_policy_afinfo {
283 unsigned short family;
284 struct dst_ops *dst_ops;
285 void (*garbage_collect)(struct net *net);
286 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
287 const xfrm_address_t *saddr,
288 const xfrm_address_t *daddr);
289 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
290 void (*decode_session)(struct sk_buff *skb,
293 int (*get_tos)(const struct flowi *fl);
294 int (*init_path)(struct xfrm_dst *path,
295 struct dst_entry *dst,
297 int (*fill_dst)(struct xfrm_dst *xdst,
298 struct net_device *dev,
299 const struct flowi *fl);
300 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
303 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
304 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
305 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
306 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
309 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
310 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
311 extern int __xfrm_state_delete(struct xfrm_state *x);
313 struct xfrm_state_afinfo {
317 struct module *owner;
318 const struct xfrm_type *type_map[IPPROTO_MAX];
319 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
320 int (*init_flags)(struct xfrm_state *x);
321 void (*init_tempsel)(struct xfrm_selector *sel,
322 const struct flowi *fl);
323 void (*init_temprop)(struct xfrm_state *x,
324 const struct xfrm_tmpl *tmpl,
325 const xfrm_address_t *daddr,
326 const xfrm_address_t *saddr);
327 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
328 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
329 int (*output)(struct sk_buff *skb);
330 int (*output_finish)(struct sk_buff *skb);
331 int (*extract_input)(struct xfrm_state *x,
332 struct sk_buff *skb);
333 int (*extract_output)(struct xfrm_state *x,
334 struct sk_buff *skb);
335 int (*transport_finish)(struct sk_buff *skb,
339 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
340 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
342 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
346 struct module *owner;
349 #define XFRM_TYPE_NON_FRAGMENT 1
350 #define XFRM_TYPE_REPLAY_PROT 2
351 #define XFRM_TYPE_LOCAL_COADDR 4
352 #define XFRM_TYPE_REMOTE_COADDR 8
354 int (*init_state)(struct xfrm_state *x);
355 void (*destructor)(struct xfrm_state *);
356 int (*input)(struct xfrm_state *, struct sk_buff *skb);
357 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
358 int (*reject)(struct xfrm_state *, struct sk_buff *,
359 const struct flowi *);
360 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
361 /* Estimate maximal size of result of transformation of a dgram */
362 u32 (*get_mtu)(struct xfrm_state *, int size);
365 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
366 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
370 * Remove encapsulation header.
372 * The IP header will be moved over the top of the encapsulation
375 * On entry, the transport header shall point to where the IP header
376 * should be and the network header shall be set to where the IP
377 * header currently is. skb->data shall point to the start of the
380 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
383 * This is the actual input entry point.
385 * For transport mode and equivalent this would be identical to
386 * input2 (which does not need to be set). While tunnel mode
387 * and equivalent would set this to the tunnel encapsulation function
388 * xfrm4_prepare_input that would in turn call input2.
390 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
393 * Add encapsulation header.
395 * On exit, the transport header will be set to the start of the
396 * encapsulation header to be filled in by x->type->output and
397 * the mac header will be set to the nextheader (protocol for
398 * IPv4) field of the extension header directly preceding the
399 * encapsulation header, or in its absence, that of the top IP
400 * header. The value of the network header will always point
401 * to the top IP header while skb->data will point to the payload.
403 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
406 * This is the actual output entry point.
408 * For transport mode and equivalent this would be identical to
409 * output2 (which does not need to be set). While tunnel mode
410 * and equivalent would set this to a tunnel encapsulation function
411 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
414 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
416 struct xfrm_state_afinfo *afinfo;
417 struct module *owner;
422 /* Flags for xfrm_mode. */
424 XFRM_MODE_FLAG_TUNNEL = 1,
427 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
428 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
430 static inline int xfrm_af2proto(unsigned int family)
442 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
444 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
445 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
446 return x->inner_mode;
448 return x->inner_mode_iaf;
452 /* id in template is interpreted as:
453 * daddr - destination of tunnel, may be zero for transport mode.
454 * spi - zero to acquire spi. Not zero if spi is static, then
455 * daddr must be fixed too.
456 * proto - AH/ESP/IPCOMP
460 /* Source address of tunnel. Ignored, if it is not a tunnel. */
461 xfrm_address_t saddr;
463 unsigned short encap_family;
467 /* Mode: transport, tunnel etc. */
470 /* Sharing mode: unique, this session only, this user only etc. */
473 /* May skip this transfomration if no SA is found */
476 /* Skip aalgos/ealgos/calgos checks. */
479 /* Bit mask of algos allowed for acquisition */
485 #define XFRM_MAX_DEPTH 6
487 struct xfrm_policy_walk_entry {
488 struct list_head all;
492 struct xfrm_policy_walk {
493 struct xfrm_policy_walk_entry walk;
502 struct hlist_node bydst;
503 struct hlist_node byidx;
505 /* This lock only affects elements except for entry. */
508 struct timer_list timer;
510 struct flow_cache_object flo;
514 struct xfrm_mark mark;
515 struct xfrm_selector selector;
516 struct xfrm_lifetime_cfg lft;
517 struct xfrm_lifetime_cur curlft;
518 struct xfrm_policy_walk_entry walk;
524 struct xfrm_sec_ctx *security;
525 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
528 static inline struct net *xp_net(const struct xfrm_policy *xp)
530 return read_pnet(&xp->xp_net);
533 struct xfrm_kmaddress {
534 xfrm_address_t local;
535 xfrm_address_t remote;
540 struct xfrm_migrate {
541 xfrm_address_t old_daddr;
542 xfrm_address_t old_saddr;
543 xfrm_address_t new_daddr;
544 xfrm_address_t new_saddr;
553 #define XFRM_KM_TIMEOUT 30
555 #define XFRM_REPLAY_SEQ 1
556 #define XFRM_REPLAY_OSEQ 2
557 #define XFRM_REPLAY_SEQ_MASK 3
559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
562 /* default aevent timeout in units of 100ms */
563 #define XFRM_AE_ETIME 10
564 /* Async Event timer multiplier */
565 #define XFRM_AE_ETH_M 10
566 /* default seq threshold size */
567 #define XFRM_AE_SEQT_SIZE 2
570 struct list_head list;
572 int (*notify)(struct xfrm_state *x, const struct km_event *c);
573 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
574 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
575 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
576 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
577 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
578 int (*migrate)(const struct xfrm_selector *sel,
580 const struct xfrm_migrate *m,
582 const struct xfrm_kmaddress *k);
585 extern int xfrm_register_km(struct xfrm_mgr *km);
586 extern int xfrm_unregister_km(struct xfrm_mgr *km);
589 * This structure is used for the duration where packets are being
590 * transformed by IPsec. As soon as the packet leaves IPsec the
591 * area beyond the generic IP part may be overwritten.
595 struct inet_skb_parm h4;
596 struct inet6_skb_parm h6;
599 /* Sequence number for replay protection. */
612 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
615 * This structure is used by the afinfo prepare_input/prepare_output functions
616 * to transmit header information to the mode input/output functions.
618 struct xfrm_mode_skb_cb {
620 struct inet_skb_parm h4;
621 struct inet6_skb_parm h6;
624 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
628 /* IP header length (excluding options or extension headers). */
631 /* TOS for IPv4, class for IPv6. */
634 /* TTL for IPv4, hop limitfor IPv6. */
637 /* Protocol for IPv4, NH for IPv6. */
640 /* Option length for IPv4, zero for IPv6. */
643 /* Used by IPv6 only, zero for IPv4. */
647 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
650 * This structure is used by the input processing to locate the SPI and
651 * related information.
653 struct xfrm_spi_skb_cb {
655 struct inet_skb_parm h4;
656 struct inet6_skb_parm h6;
659 unsigned int daddroff;
663 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
665 /* Audit Information */
672 #ifdef CONFIG_AUDITSYSCALL
673 static inline struct audit_buffer *xfrm_audit_start(const char *op)
675 struct audit_buffer *audit_buf = NULL;
677 if (audit_enabled == 0)
679 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
680 AUDIT_MAC_IPSEC_EVENT);
681 if (audit_buf == NULL)
683 audit_log_format(audit_buf, "op=%s", op);
687 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
688 struct audit_buffer *audit_buf)
693 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
695 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
696 audit_log_format(audit_buf, " subj=%s", secctx);
697 security_release_secctx(secctx, secctx_len);
699 audit_log_task_context(audit_buf);
702 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
703 u32 auid, u32 ses, u32 secid);
704 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
705 u32 auid, u32 ses, u32 secid);
706 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
707 u32 auid, u32 ses, u32 secid);
708 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
709 u32 auid, u32 ses, u32 secid);
710 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
711 struct sk_buff *skb);
712 extern void xfrm_audit_state_replay(struct xfrm_state *x,
713 struct sk_buff *skb, __be32 net_seq);
714 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
715 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
716 __be32 net_spi, __be32 net_seq);
717 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
718 struct sk_buff *skb, u8 proto);
721 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
722 u32 auid, u32 ses, u32 secid)
726 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
727 u32 auid, u32 ses, u32 secid)
731 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
732 u32 auid, u32 ses, u32 secid)
736 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
737 u32 auid, u32 ses, u32 secid)
741 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
746 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
747 struct sk_buff *skb, __be32 net_seq)
751 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
756 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
757 __be32 net_spi, __be32 net_seq)
761 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
762 struct sk_buff *skb, u8 proto)
765 #endif /* CONFIG_AUDITSYSCALL */
767 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
769 if (likely(policy != NULL))
770 atomic_inc(&policy->refcnt);
773 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
775 static inline void xfrm_pol_put(struct xfrm_policy *policy)
777 if (atomic_dec_and_test(&policy->refcnt))
778 xfrm_policy_destroy(policy);
781 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
784 for (i = npols - 1; i >= 0; --i)
785 xfrm_pol_put(pols[i]);
788 extern void __xfrm_state_destroy(struct xfrm_state *);
790 static inline void __xfrm_state_put(struct xfrm_state *x)
792 atomic_dec(&x->refcnt);
795 static inline void xfrm_state_put(struct xfrm_state *x)
797 if (atomic_dec_and_test(&x->refcnt))
798 __xfrm_state_destroy(x);
801 static inline void xfrm_state_hold(struct xfrm_state *x)
803 atomic_inc(&x->refcnt);
806 static inline bool addr_match(const void *token1, const void *token2,
809 const __be32 *a1 = token1;
810 const __be32 *a2 = token2;
814 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
815 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
818 if (memcmp(a1, a2, pdw << 2))
824 mask = htonl((0xffffffff) << (32 - pbi));
826 if ((a1[pdw] ^ a2[pdw]) & mask)
834 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
837 switch(fl->flowi_proto) {
840 case IPPROTO_UDPLITE:
842 port = uli->ports.sport;
846 port = htons(uli->icmpt.type);
849 port = htons(uli->mht.type);
852 port = htons(ntohl(uli->gre_key) >> 16);
861 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
864 switch(fl->flowi_proto) {
867 case IPPROTO_UDPLITE:
869 port = uli->ports.dport;
873 port = htons(uli->icmpt.code);
876 port = htons(ntohl(uli->gre_key) & 0xffff);
884 extern int xfrm_selector_match(const struct xfrm_selector *sel,
885 const struct flowi *fl,
886 unsigned short family);
888 #ifdef CONFIG_SECURITY_NETWORK_XFRM
889 /* If neither has a context --> match
890 * Otherwise, both must have a context and the sids, doi, alg must match
892 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
894 return ((!s1 && !s2) ||
896 (s1->ctx_sid == s2->ctx_sid) &&
897 (s1->ctx_doi == s2->ctx_doi) &&
898 (s1->ctx_alg == s2->ctx_alg)));
901 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
907 /* A struct encoding bundle of transformations to apply to some set of flow.
909 * dst->child points to the next element of bundle.
910 * dst->xfrm points to an instanse of transformer.
912 * Due to unfortunate limitations of current routing cache, which we
913 * have no time to fix, it mirrors struct rtable and bound to the same
914 * routing key, including saddr,daddr. However, we can have many of
915 * bundles differing by session id. All the bundles grow from a parent
920 struct dst_entry dst;
924 struct dst_entry *route;
925 struct flow_cache_object flo;
926 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
927 int num_pols, num_xfrms;
928 #ifdef CONFIG_XFRM_SUB_POLICY
929 struct flowi *origin;
930 struct xfrm_selector *partner;
934 u32 route_mtu_cached;
935 u32 child_mtu_cached;
941 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
943 xfrm_pols_put(xdst->pols, xdst->num_pols);
944 dst_release(xdst->route);
945 if (likely(xdst->u.dst.xfrm))
946 xfrm_state_put(xdst->u.dst.xfrm);
947 #ifdef CONFIG_XFRM_SUB_POLICY
950 kfree(xdst->partner);
951 xdst->partner = NULL;
956 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
961 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
964 static inline int secpath_exists(struct sk_buff *skb)
967 return skb->sp != NULL;
973 static inline struct sec_path *
974 secpath_get(struct sec_path *sp)
977 atomic_inc(&sp->refcnt);
981 extern void __secpath_destroy(struct sec_path *sp);
984 secpath_put(struct sec_path *sp)
986 if (sp && atomic_dec_and_test(&sp->refcnt))
987 __secpath_destroy(sp);
990 extern struct sec_path *secpath_dup(struct sec_path *src);
993 secpath_reset(struct sk_buff *skb)
996 secpath_put(skb->sp);
1002 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1006 return addr->a4 == 0;
1008 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1014 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1016 return (tmpl->saddr.a4 &&
1017 tmpl->saddr.a4 != x->props.saddr.a4);
1021 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1023 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1024 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1028 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1032 return __xfrm4_state_addr_cmp(tmpl, x);
1034 return __xfrm6_state_addr_cmp(tmpl, x);
1040 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1042 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1043 struct sk_buff *skb,
1044 unsigned int family, int reverse)
1046 struct net *net = dev_net(skb->dev);
1047 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1049 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1050 return __xfrm_policy_check(sk, ndir, skb, family);
1052 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1053 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1054 __xfrm_policy_check(sk, ndir, skb, family);
1057 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1059 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1062 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1064 return xfrm_policy_check(sk, dir, skb, AF_INET);
1067 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1069 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1072 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1073 struct sk_buff *skb)
1075 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1078 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1079 struct sk_buff *skb)
1081 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1084 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family, int reverse);
1087 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1088 unsigned int family)
1090 return __xfrm_decode_session(skb, fl, family, 0);
1093 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1095 unsigned int family)
1097 return __xfrm_decode_session(skb, fl, family, 1);
1100 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1102 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1104 struct net *net = dev_net(skb->dev);
1106 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1107 (skb_dst(skb)->flags & DST_NOXFRM) ||
1108 __xfrm_route_forward(skb, family);
1111 static inline int xfrm4_route_forward(struct sk_buff *skb)
1113 return xfrm_route_forward(skb, AF_INET);
1116 static inline int xfrm6_route_forward(struct sk_buff *skb)
1118 return xfrm_route_forward(skb, AF_INET6);
1121 extern int __xfrm_sk_clone_policy(struct sock *sk);
1123 static inline int xfrm_sk_clone_policy(struct sock *sk)
1125 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1126 return __xfrm_sk_clone_policy(sk);
1130 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1132 static inline void xfrm_sk_free_policy(struct sock *sk)
1134 if (unlikely(sk->sk_policy[0] != NULL)) {
1135 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1136 sk->sk_policy[0] = NULL;
1138 if (unlikely(sk->sk_policy[1] != NULL)) {
1139 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1140 sk->sk_policy[1] = NULL;
1146 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1147 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1148 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1149 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1150 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1154 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1158 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1162 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1164 unsigned int family)
1168 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1169 struct sk_buff *skb)
1173 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1174 struct sk_buff *skb)
1181 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1185 return (xfrm_address_t *)&fl->u.ip4.daddr;
1187 return (xfrm_address_t *)&fl->u.ip6.daddr;
1193 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1197 return (xfrm_address_t *)&fl->u.ip4.saddr;
1199 return (xfrm_address_t *)&fl->u.ip6.saddr;
1205 void xfrm_flowi_addr_get(const struct flowi *fl,
1206 xfrm_address_t *saddr, xfrm_address_t *daddr,
1207 unsigned short family)
1211 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1212 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1215 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1216 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1221 static __inline__ int
1222 __xfrm4_state_addr_check(const struct xfrm_state *x,
1223 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1225 if (daddr->a4 == x->id.daddr.a4 &&
1226 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1231 static __inline__ int
1232 __xfrm6_state_addr_check(const struct xfrm_state *x,
1233 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1235 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1236 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1237 ipv6_addr_any((struct in6_addr *)saddr) ||
1238 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1243 static __inline__ int
1244 xfrm_state_addr_check(const struct xfrm_state *x,
1245 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1246 unsigned short family)
1250 return __xfrm4_state_addr_check(x, daddr, saddr);
1252 return __xfrm6_state_addr_check(x, daddr, saddr);
1257 static __inline__ int
1258 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1259 unsigned short family)
1263 return __xfrm4_state_addr_check(x,
1264 (const xfrm_address_t *)&fl->u.ip4.daddr,
1265 (const xfrm_address_t *)&fl->u.ip4.saddr);
1267 return __xfrm6_state_addr_check(x,
1268 (const xfrm_address_t *)&fl->u.ip6.daddr,
1269 (const xfrm_address_t *)&fl->u.ip6.saddr);
1274 static inline int xfrm_state_kern(const struct xfrm_state *x)
1276 return atomic_read(&x->tunnel_users);
1279 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1281 return (!userproto || proto == userproto ||
1282 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1283 proto == IPPROTO_ESP ||
1284 proto == IPPROTO_COMP)));
1288 * xfrm algorithm information
1290 struct xfrm_algo_aead_info {
1294 struct xfrm_algo_auth_info {
1299 struct xfrm_algo_encr_info {
1304 struct xfrm_algo_comp_info {
1308 struct xfrm_algo_desc {
1313 struct xfrm_algo_aead_info aead;
1314 struct xfrm_algo_auth_info auth;
1315 struct xfrm_algo_encr_info encr;
1316 struct xfrm_algo_comp_info comp;
1318 struct sadb_alg desc;
1321 /* XFRM tunnel handlers. */
1322 struct xfrm_tunnel {
1323 int (*handler)(struct sk_buff *skb);
1324 int (*err_handler)(struct sk_buff *skb, u32 info);
1326 struct xfrm_tunnel __rcu *next;
1330 struct xfrm6_tunnel {
1331 int (*handler)(struct sk_buff *skb);
1332 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1333 u8 type, u8 code, int offset, __be32 info);
1334 struct xfrm6_tunnel __rcu *next;
1338 extern void xfrm_init(void);
1339 extern void xfrm4_init(int rt_hash_size);
1340 extern int xfrm_state_init(struct net *net);
1341 extern void xfrm_state_fini(struct net *net);
1342 extern void xfrm4_state_init(void);
1344 extern int xfrm6_init(void);
1345 extern void xfrm6_fini(void);
1346 extern int xfrm6_state_init(void);
1347 extern void xfrm6_state_fini(void);
1349 static inline int xfrm6_init(void)
1353 static inline void xfrm6_fini(void)
1359 #ifdef CONFIG_XFRM_STATISTICS
1360 extern int xfrm_proc_init(struct net *net);
1361 extern void xfrm_proc_fini(struct net *net);
1364 extern int xfrm_sysctl_init(struct net *net);
1365 #ifdef CONFIG_SYSCTL
1366 extern void xfrm_sysctl_fini(struct net *net);
1368 static inline void xfrm_sysctl_fini(struct net *net)
1373 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1374 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1375 int (*func)(struct xfrm_state *, int, void*), void *);
1376 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1377 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1378 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1379 const xfrm_address_t *saddr,
1380 const struct flowi *fl,
1381 struct xfrm_tmpl *tmpl,
1382 struct xfrm_policy *pol, int *err,
1383 unsigned short family);
1384 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1385 xfrm_address_t *daddr,
1386 xfrm_address_t *saddr,
1387 unsigned short family,
1388 u8 mode, u8 proto, u32 reqid);
1389 extern int xfrm_state_check_expire(struct xfrm_state *x);
1390 extern void xfrm_state_insert(struct xfrm_state *x);
1391 extern int xfrm_state_add(struct xfrm_state *x);
1392 extern int xfrm_state_update(struct xfrm_state *x);
1393 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr, __be32 spi,
1395 u8 proto, unsigned short family);
1396 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1397 const xfrm_address_t *daddr,
1398 const xfrm_address_t *saddr,
1400 unsigned short family);
1401 #ifdef CONFIG_XFRM_SUB_POLICY
1402 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1403 int n, unsigned short family);
1404 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1405 int n, unsigned short family);
1407 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1408 int n, unsigned short family)
1413 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1414 int n, unsigned short family)
1420 struct xfrmk_sadinfo {
1421 u32 sadhcnt; /* current hash bkts */
1422 u32 sadhmcnt; /* max allowed hash bkts */
1423 u32 sadcnt; /* current running count */
1426 struct xfrmk_spdinfo {
1437 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1439 extern int xfrm_state_delete(struct xfrm_state *x);
1440 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1441 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1442 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1443 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1444 extern int xfrm_init_replay(struct xfrm_state *x);
1445 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1446 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1447 extern int xfrm_init_state(struct xfrm_state *x);
1448 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1449 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1451 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1452 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1453 extern int xfrm_output(struct sk_buff *skb);
1454 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1455 extern int xfrm4_extract_header(struct sk_buff *skb);
1456 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1457 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1459 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1460 extern int xfrm4_rcv(struct sk_buff *skb);
1462 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1464 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1467 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1468 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1469 extern int xfrm4_output(struct sk_buff *skb);
1470 extern int xfrm4_output_finish(struct sk_buff *skb);
1471 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1472 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1473 extern int xfrm6_extract_header(struct sk_buff *skb);
1474 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1475 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1476 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1477 extern int xfrm6_rcv(struct sk_buff *skb);
1478 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1479 xfrm_address_t *saddr, u8 proto);
1480 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1481 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1482 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1483 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1484 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1485 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1486 extern int xfrm6_output(struct sk_buff *skb);
1487 extern int xfrm6_output_finish(struct sk_buff *skb);
1488 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1492 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1493 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1495 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1497 return -ENOPROTOOPT;
1500 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1502 /* should not happen */
1508 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1510 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1511 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1512 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1513 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1514 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1515 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1517 struct xfrm_selector *sel,
1518 struct xfrm_sec_ctx *ctx, int delete,
1520 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1521 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1522 u32 xfrm_get_acqseq(void);
1523 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1524 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1525 u8 mode, u32 reqid, u8 proto,
1526 const xfrm_address_t *daddr,
1527 const xfrm_address_t *saddr, int create,
1528 unsigned short family);
1529 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1531 #ifdef CONFIG_XFRM_MIGRATE
1532 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1533 const struct xfrm_migrate *m, int num_bundles,
1534 const struct xfrm_kmaddress *k);
1535 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1536 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1537 struct xfrm_migrate *m);
1538 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1539 struct xfrm_migrate *m, int num_bundles,
1540 struct xfrm_kmaddress *k);
1543 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1544 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1545 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1547 extern void xfrm_input_init(void);
1548 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1550 extern void xfrm_probe_algs(void);
1551 extern int xfrm_count_auth_supported(void);
1552 extern int xfrm_count_enc_supported(void);
1553 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1554 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1555 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1556 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1557 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1558 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1559 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1560 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1561 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1566 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1569 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1570 const xfrm_address_t *b,
1576 return (__force u32)a->a4 - (__force u32)b->a4;
1578 return ipv6_addr_cmp((const struct in6_addr *)a,
1579 (const struct in6_addr *)b);
1583 static inline int xfrm_policy_id2dir(u32 index)
1589 static inline int xfrm_aevent_is_on(struct net *net)
1595 nlsk = rcu_dereference(net->xfrm.nlsk);
1597 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1603 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1605 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1610 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1613 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1615 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1618 #ifdef CONFIG_XFRM_MIGRATE
1619 static inline int xfrm_replay_clone(struct xfrm_state *x,
1620 struct xfrm_state *orig)
1622 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1627 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1628 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1630 x->preplay_esn = kmemdup(x->replay_esn,
1631 xfrm_replay_state_esn_len(x->replay_esn),
1633 if (!x->preplay_esn) {
1634 kfree(x->replay_esn);
1641 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1643 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1646 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1648 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1651 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1654 for (i = 0; i < n; i++)
1655 xfrm_state_put(*(states + i));
1658 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1661 for (i = 0; i < n; i++)
1662 xfrm_state_delete(*(states + i));
1667 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1669 return skb->sp->xvec[skb->sp->len - 1];
1673 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1675 if (attrs[XFRMA_MARK])
1676 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1683 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1686 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1693 #endif /* _NET_XFRM_H */