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;
216 /* used to fix curlft->add_time when changing date */
220 unsigned long lastused;
222 /* Reference to data common to all the instances of this
224 const struct xfrm_type *type;
225 struct xfrm_mode *inner_mode;
226 struct xfrm_mode *inner_mode_iaf;
227 struct xfrm_mode *outer_mode;
229 /* Security context */
230 struct xfrm_sec_ctx *security;
232 /* Private data of this transformer, format is opaque,
233 * interpreted by xfrm_type methods. */
237 static inline struct net *xs_net(struct xfrm_state *x)
239 return read_pnet(&x->xs_net);
242 /* xflags - make enum if more show up */
243 #define XFRM_TIME_DEFER 1
244 #define XFRM_SOFT_EXPIRE 2
255 /* callback structure passed from either netlink or pfkey */
272 void (*advance)(struct xfrm_state *x, __be32 net_seq);
273 int (*check)(struct xfrm_state *x,
276 void (*notify)(struct xfrm_state *x, int event);
277 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
283 struct xfrm_policy_afinfo {
284 unsigned short family;
285 struct dst_ops *dst_ops;
286 void (*garbage_collect)(struct net *net);
287 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
288 const xfrm_address_t *saddr,
289 const xfrm_address_t *daddr);
290 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
291 void (*decode_session)(struct sk_buff *skb,
294 int (*get_tos)(const struct flowi *fl);
295 int (*init_path)(struct xfrm_dst *path,
296 struct dst_entry *dst,
298 int (*fill_dst)(struct xfrm_dst *xdst,
299 struct net_device *dev,
300 const struct flowi *fl);
301 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
304 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
305 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
306 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
307 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
310 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
311 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
312 extern int __xfrm_state_delete(struct xfrm_state *x);
314 struct xfrm_state_afinfo {
318 struct module *owner;
319 const struct xfrm_type *type_map[IPPROTO_MAX];
320 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
321 int (*init_flags)(struct xfrm_state *x);
322 void (*init_tempsel)(struct xfrm_selector *sel,
323 const struct flowi *fl);
324 void (*init_temprop)(struct xfrm_state *x,
325 const struct xfrm_tmpl *tmpl,
326 const xfrm_address_t *daddr,
327 const xfrm_address_t *saddr);
328 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
329 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
330 int (*output)(struct sk_buff *skb);
331 int (*output_finish)(struct sk_buff *skb);
332 int (*extract_input)(struct xfrm_state *x,
333 struct sk_buff *skb);
334 int (*extract_output)(struct xfrm_state *x,
335 struct sk_buff *skb);
336 int (*transport_finish)(struct sk_buff *skb,
340 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
341 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
343 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
347 struct module *owner;
350 #define XFRM_TYPE_NON_FRAGMENT 1
351 #define XFRM_TYPE_REPLAY_PROT 2
352 #define XFRM_TYPE_LOCAL_COADDR 4
353 #define XFRM_TYPE_REMOTE_COADDR 8
355 int (*init_state)(struct xfrm_state *x);
356 void (*destructor)(struct xfrm_state *);
357 int (*input)(struct xfrm_state *, struct sk_buff *skb);
358 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
359 int (*reject)(struct xfrm_state *, struct sk_buff *,
360 const struct flowi *);
361 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
362 /* Estimate maximal size of result of transformation of a dgram */
363 u32 (*get_mtu)(struct xfrm_state *, int size);
366 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
367 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
371 * Remove encapsulation header.
373 * The IP header will be moved over the top of the encapsulation
376 * On entry, the transport header shall point to where the IP header
377 * should be and the network header shall be set to where the IP
378 * header currently is. skb->data shall point to the start of the
381 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
384 * This is the actual input entry point.
386 * For transport mode and equivalent this would be identical to
387 * input2 (which does not need to be set). While tunnel mode
388 * and equivalent would set this to the tunnel encapsulation function
389 * xfrm4_prepare_input that would in turn call input2.
391 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
394 * Add encapsulation header.
396 * On exit, the transport header will be set to the start of the
397 * encapsulation header to be filled in by x->type->output and
398 * the mac header will be set to the nextheader (protocol for
399 * IPv4) field of the extension header directly preceding the
400 * encapsulation header, or in its absence, that of the top IP
401 * header. The value of the network header will always point
402 * to the top IP header while skb->data will point to the payload.
404 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
407 * This is the actual output entry point.
409 * For transport mode and equivalent this would be identical to
410 * output2 (which does not need to be set). While tunnel mode
411 * and equivalent would set this to a tunnel encapsulation function
412 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
415 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
417 struct xfrm_state_afinfo *afinfo;
418 struct module *owner;
423 /* Flags for xfrm_mode. */
425 XFRM_MODE_FLAG_TUNNEL = 1,
428 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
429 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
431 static inline int xfrm_af2proto(unsigned int family)
443 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
445 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
446 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
447 return x->inner_mode;
449 return x->inner_mode_iaf;
453 /* id in template is interpreted as:
454 * daddr - destination of tunnel, may be zero for transport mode.
455 * spi - zero to acquire spi. Not zero if spi is static, then
456 * daddr must be fixed too.
457 * proto - AH/ESP/IPCOMP
461 /* Source address of tunnel. Ignored, if it is not a tunnel. */
462 xfrm_address_t saddr;
464 unsigned short encap_family;
468 /* Mode: transport, tunnel etc. */
471 /* Sharing mode: unique, this session only, this user only etc. */
474 /* May skip this transfomration if no SA is found */
477 /* Skip aalgos/ealgos/calgos checks. */
480 /* Bit mask of algos allowed for acquisition */
486 #define XFRM_MAX_DEPTH 6
488 struct xfrm_policy_walk_entry {
489 struct list_head all;
493 struct xfrm_policy_walk {
494 struct xfrm_policy_walk_entry walk;
503 struct hlist_node bydst;
504 struct hlist_node byidx;
506 /* This lock only affects elements except for entry. */
509 struct timer_list timer;
511 struct flow_cache_object flo;
515 struct xfrm_mark mark;
516 struct xfrm_selector selector;
517 struct xfrm_lifetime_cfg lft;
518 struct xfrm_lifetime_cur curlft;
519 struct xfrm_policy_walk_entry walk;
525 struct xfrm_sec_ctx *security;
526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
529 static inline struct net *xp_net(const struct xfrm_policy *xp)
531 return read_pnet(&xp->xp_net);
534 struct xfrm_kmaddress {
535 xfrm_address_t local;
536 xfrm_address_t remote;
541 struct xfrm_migrate {
542 xfrm_address_t old_daddr;
543 xfrm_address_t old_saddr;
544 xfrm_address_t new_daddr;
545 xfrm_address_t new_saddr;
554 #define XFRM_KM_TIMEOUT 30
556 #define XFRM_REPLAY_SEQ 1
557 #define XFRM_REPLAY_OSEQ 2
558 #define XFRM_REPLAY_SEQ_MASK 3
560 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
561 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
563 /* default aevent timeout in units of 100ms */
564 #define XFRM_AE_ETIME 10
565 /* Async Event timer multiplier */
566 #define XFRM_AE_ETH_M 10
567 /* default seq threshold size */
568 #define XFRM_AE_SEQT_SIZE 2
571 struct list_head list;
573 int (*notify)(struct xfrm_state *x, const struct km_event *c);
574 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
575 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
576 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
577 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
578 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
579 int (*migrate)(const struct xfrm_selector *sel,
581 const struct xfrm_migrate *m,
583 const struct xfrm_kmaddress *k);
586 extern int xfrm_register_km(struct xfrm_mgr *km);
587 extern int xfrm_unregister_km(struct xfrm_mgr *km);
590 * This structure is used for the duration where packets are being
591 * transformed by IPsec. As soon as the packet leaves IPsec the
592 * area beyond the generic IP part may be overwritten.
596 struct inet_skb_parm h4;
597 struct inet6_skb_parm h6;
600 /* Sequence number for replay protection. */
613 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
616 * This structure is used by the afinfo prepare_input/prepare_output functions
617 * to transmit header information to the mode input/output functions.
619 struct xfrm_mode_skb_cb {
621 struct inet_skb_parm h4;
622 struct inet6_skb_parm h6;
625 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
629 /* IP header length (excluding options or extension headers). */
632 /* TOS for IPv4, class for IPv6. */
635 /* TTL for IPv4, hop limitfor IPv6. */
638 /* Protocol for IPv4, NH for IPv6. */
641 /* Option length for IPv4, zero for IPv6. */
644 /* Used by IPv6 only, zero for IPv4. */
648 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
651 * This structure is used by the input processing to locate the SPI and
652 * related information.
654 struct xfrm_spi_skb_cb {
656 struct inet_skb_parm h4;
657 struct inet6_skb_parm h6;
660 unsigned int daddroff;
664 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
666 /* Audit Information */
673 #ifdef CONFIG_AUDITSYSCALL
674 static inline struct audit_buffer *xfrm_audit_start(const char *op)
676 struct audit_buffer *audit_buf = NULL;
678 if (audit_enabled == 0)
680 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
681 AUDIT_MAC_IPSEC_EVENT);
682 if (audit_buf == NULL)
684 audit_log_format(audit_buf, "op=%s", op);
688 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
689 struct audit_buffer *audit_buf)
694 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
696 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
697 audit_log_format(audit_buf, " subj=%s", secctx);
698 security_release_secctx(secctx, secctx_len);
700 audit_log_task_context(audit_buf);
703 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
704 u32 auid, u32 ses, u32 secid);
705 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
706 u32 auid, u32 ses, u32 secid);
707 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
708 u32 auid, u32 ses, u32 secid);
709 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
710 u32 auid, u32 ses, u32 secid);
711 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
712 struct sk_buff *skb);
713 extern void xfrm_audit_state_replay(struct xfrm_state *x,
714 struct sk_buff *skb, __be32 net_seq);
715 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
716 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
717 __be32 net_spi, __be32 net_seq);
718 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
719 struct sk_buff *skb, u8 proto);
722 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
723 u32 auid, u32 ses, u32 secid)
727 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
728 u32 auid, u32 ses, u32 secid)
732 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
733 u32 auid, u32 ses, u32 secid)
737 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
738 u32 auid, u32 ses, u32 secid)
742 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
747 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
748 struct sk_buff *skb, __be32 net_seq)
752 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
757 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
758 __be32 net_spi, __be32 net_seq)
762 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
763 struct sk_buff *skb, u8 proto)
766 #endif /* CONFIG_AUDITSYSCALL */
768 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
770 if (likely(policy != NULL))
771 atomic_inc(&policy->refcnt);
774 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
776 static inline void xfrm_pol_put(struct xfrm_policy *policy)
778 if (atomic_dec_and_test(&policy->refcnt))
779 xfrm_policy_destroy(policy);
782 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
785 for (i = npols - 1; i >= 0; --i)
786 xfrm_pol_put(pols[i]);
789 extern void __xfrm_state_destroy(struct xfrm_state *);
791 static inline void __xfrm_state_put(struct xfrm_state *x)
793 atomic_dec(&x->refcnt);
796 static inline void xfrm_state_put(struct xfrm_state *x)
798 if (atomic_dec_and_test(&x->refcnt))
799 __xfrm_state_destroy(x);
802 static inline void xfrm_state_hold(struct xfrm_state *x)
804 atomic_inc(&x->refcnt);
807 static inline bool addr_match(const void *token1, const void *token2,
810 const __be32 *a1 = token1;
811 const __be32 *a2 = token2;
815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
819 if (memcmp(a1, a2, pdw << 2))
825 mask = htonl((0xffffffff) << (32 - pbi));
827 if ((a1[pdw] ^ a2[pdw]) & mask)
834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
839 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
846 switch(fl->flowi_proto) {
849 case IPPROTO_UDPLITE:
851 port = uli->ports.sport;
855 port = htons(uli->icmpt.type);
858 port = htons(uli->mht.type);
861 port = htons(ntohl(uli->gre_key) >> 16);
870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
873 switch(fl->flowi_proto) {
876 case IPPROTO_UDPLITE:
878 port = uli->ports.dport;
882 port = htons(uli->icmpt.code);
885 port = htons(ntohl(uli->gre_key) & 0xffff);
893 extern bool xfrm_selector_match(const struct xfrm_selector *sel,
894 const struct flowi *fl,
895 unsigned short family);
897 #ifdef CONFIG_SECURITY_NETWORK_XFRM
898 /* If neither has a context --> match
899 * Otherwise, both must have a context and the sids, doi, alg must match
901 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
903 return ((!s1 && !s2) ||
905 (s1->ctx_sid == s2->ctx_sid) &&
906 (s1->ctx_doi == s2->ctx_doi) &&
907 (s1->ctx_alg == s2->ctx_alg)));
910 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
916 /* A struct encoding bundle of transformations to apply to some set of flow.
918 * dst->child points to the next element of bundle.
919 * dst->xfrm points to an instanse of transformer.
921 * Due to unfortunate limitations of current routing cache, which we
922 * have no time to fix, it mirrors struct rtable and bound to the same
923 * routing key, including saddr,daddr. However, we can have many of
924 * bundles differing by session id. All the bundles grow from a parent
929 struct dst_entry dst;
933 struct dst_entry *route;
934 struct flow_cache_object flo;
935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
936 int num_pols, num_xfrms;
937 #ifdef CONFIG_XFRM_SUB_POLICY
938 struct flowi *origin;
939 struct xfrm_selector *partner;
943 u32 route_mtu_cached;
944 u32 child_mtu_cached;
950 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
952 xfrm_pols_put(xdst->pols, xdst->num_pols);
953 dst_release(xdst->route);
954 if (likely(xdst->u.dst.xfrm))
955 xfrm_state_put(xdst->u.dst.xfrm);
956 #ifdef CONFIG_XFRM_SUB_POLICY
959 kfree(xdst->partner);
960 xdst->partner = NULL;
965 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
970 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
973 static inline int secpath_exists(struct sk_buff *skb)
976 return skb->sp != NULL;
982 static inline struct sec_path *
983 secpath_get(struct sec_path *sp)
986 atomic_inc(&sp->refcnt);
990 extern void __secpath_destroy(struct sec_path *sp);
993 secpath_put(struct sec_path *sp)
995 if (sp && atomic_dec_and_test(&sp->refcnt))
996 __secpath_destroy(sp);
999 extern struct sec_path *secpath_dup(struct sec_path *src);
1002 secpath_reset(struct sk_buff *skb)
1005 secpath_put(skb->sp);
1011 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1015 return addr->a4 == 0;
1017 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1023 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1025 return (tmpl->saddr.a4 &&
1026 tmpl->saddr.a4 != x->props.saddr.a4);
1030 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1032 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1033 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1037 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1041 return __xfrm4_state_addr_cmp(tmpl, x);
1043 return __xfrm6_state_addr_cmp(tmpl, x);
1049 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1051 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1052 struct sk_buff *skb,
1053 unsigned int family, int reverse)
1055 struct net *net = dev_net(skb->dev);
1056 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1058 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1059 return __xfrm_policy_check(sk, ndir, skb, family);
1061 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1062 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1063 __xfrm_policy_check(sk, ndir, skb, family);
1066 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1068 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1071 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1073 return xfrm_policy_check(sk, dir, skb, AF_INET);
1076 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1078 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1081 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1082 struct sk_buff *skb)
1084 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1087 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1088 struct sk_buff *skb)
1090 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1093 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1094 unsigned int family, int reverse);
1096 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1097 unsigned int family)
1099 return __xfrm_decode_session(skb, fl, family, 0);
1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1104 unsigned int family)
1106 return __xfrm_decode_session(skb, fl, family, 1);
1109 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1111 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1113 struct net *net = dev_net(skb->dev);
1115 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1116 (skb_dst(skb)->flags & DST_NOXFRM) ||
1117 __xfrm_route_forward(skb, family);
1120 static inline int xfrm4_route_forward(struct sk_buff *skb)
1122 return xfrm_route_forward(skb, AF_INET);
1125 static inline int xfrm6_route_forward(struct sk_buff *skb)
1127 return xfrm_route_forward(skb, AF_INET6);
1130 extern int __xfrm_sk_clone_policy(struct sock *sk);
1132 static inline int xfrm_sk_clone_policy(struct sock *sk)
1134 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1135 return __xfrm_sk_clone_policy(sk);
1139 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1141 static inline void xfrm_sk_free_policy(struct sock *sk)
1143 if (unlikely(sk->sk_policy[0] != NULL)) {
1144 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1145 sk->sk_policy[0] = NULL;
1147 if (unlikely(sk->sk_policy[1] != NULL)) {
1148 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1149 sk->sk_policy[1] = NULL;
1155 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1156 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1157 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1158 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1159 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1163 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1167 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1171 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1173 unsigned int family)
1177 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1178 struct sk_buff *skb)
1182 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1183 struct sk_buff *skb)
1190 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1194 return (xfrm_address_t *)&fl->u.ip4.daddr;
1196 return (xfrm_address_t *)&fl->u.ip6.daddr;
1202 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1206 return (xfrm_address_t *)&fl->u.ip4.saddr;
1208 return (xfrm_address_t *)&fl->u.ip6.saddr;
1214 void xfrm_flowi_addr_get(const struct flowi *fl,
1215 xfrm_address_t *saddr, xfrm_address_t *daddr,
1216 unsigned short family)
1220 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1221 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1224 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1225 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1230 static __inline__ int
1231 __xfrm4_state_addr_check(const struct xfrm_state *x,
1232 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1234 if (daddr->a4 == x->id.daddr.a4 &&
1235 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1240 static __inline__ int
1241 __xfrm6_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1244 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1245 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1246 ipv6_addr_any((struct in6_addr *)saddr) ||
1247 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1252 static __inline__ int
1253 xfrm_state_addr_check(const struct xfrm_state *x,
1254 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1255 unsigned short family)
1259 return __xfrm4_state_addr_check(x, daddr, saddr);
1261 return __xfrm6_state_addr_check(x, daddr, saddr);
1266 static __inline__ int
1267 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1268 unsigned short family)
1272 return __xfrm4_state_addr_check(x,
1273 (const xfrm_address_t *)&fl->u.ip4.daddr,
1274 (const xfrm_address_t *)&fl->u.ip4.saddr);
1276 return __xfrm6_state_addr_check(x,
1277 (const xfrm_address_t *)&fl->u.ip6.daddr,
1278 (const xfrm_address_t *)&fl->u.ip6.saddr);
1283 static inline int xfrm_state_kern(const struct xfrm_state *x)
1285 return atomic_read(&x->tunnel_users);
1288 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1290 return (!userproto || proto == userproto ||
1291 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1292 proto == IPPROTO_ESP ||
1293 proto == IPPROTO_COMP)));
1297 * xfrm algorithm information
1299 struct xfrm_algo_aead_info {
1303 struct xfrm_algo_auth_info {
1308 struct xfrm_algo_encr_info {
1313 struct xfrm_algo_comp_info {
1317 struct xfrm_algo_desc {
1322 struct xfrm_algo_aead_info aead;
1323 struct xfrm_algo_auth_info auth;
1324 struct xfrm_algo_encr_info encr;
1325 struct xfrm_algo_comp_info comp;
1327 struct sadb_alg desc;
1330 /* XFRM tunnel handlers. */
1331 struct xfrm_tunnel {
1332 int (*handler)(struct sk_buff *skb);
1333 int (*err_handler)(struct sk_buff *skb, u32 info);
1335 struct xfrm_tunnel __rcu *next;
1339 struct xfrm6_tunnel {
1340 int (*handler)(struct sk_buff *skb);
1341 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1342 u8 type, u8 code, int offset, __be32 info);
1343 struct xfrm6_tunnel __rcu *next;
1347 extern void xfrm_init(void);
1348 extern void xfrm4_init(int rt_hash_size);
1349 extern int xfrm_state_init(struct net *net);
1350 extern void xfrm_state_fini(struct net *net);
1351 extern void xfrm4_state_init(void);
1353 extern int xfrm6_init(void);
1354 extern void xfrm6_fini(void);
1355 extern int xfrm6_state_init(void);
1356 extern void xfrm6_state_fini(void);
1358 static inline int xfrm6_init(void)
1362 static inline void xfrm6_fini(void)
1368 #ifdef CONFIG_XFRM_STATISTICS
1369 extern int xfrm_proc_init(struct net *net);
1370 extern void xfrm_proc_fini(struct net *net);
1373 extern int xfrm_sysctl_init(struct net *net);
1374 #ifdef CONFIG_SYSCTL
1375 extern void xfrm_sysctl_fini(struct net *net);
1377 static inline void xfrm_sysctl_fini(struct net *net)
1382 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1383 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1384 int (*func)(struct xfrm_state *, int, void*), void *);
1385 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1386 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1387 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1388 const xfrm_address_t *saddr,
1389 const struct flowi *fl,
1390 struct xfrm_tmpl *tmpl,
1391 struct xfrm_policy *pol, int *err,
1392 unsigned short family);
1393 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1394 xfrm_address_t *daddr,
1395 xfrm_address_t *saddr,
1396 unsigned short family,
1397 u8 mode, u8 proto, u32 reqid);
1398 extern int xfrm_state_check_expire(struct xfrm_state *x);
1399 extern void xfrm_state_insert(struct xfrm_state *x);
1400 extern int xfrm_state_add(struct xfrm_state *x);
1401 extern int xfrm_state_update(struct xfrm_state *x);
1402 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1403 const xfrm_address_t *daddr, __be32 spi,
1404 u8 proto, unsigned short family);
1405 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1406 const xfrm_address_t *daddr,
1407 const xfrm_address_t *saddr,
1409 unsigned short family);
1410 #ifdef CONFIG_XFRM_SUB_POLICY
1411 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1412 int n, unsigned short family);
1413 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1414 int n, unsigned short family);
1416 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1417 int n, unsigned short family)
1422 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1423 int n, unsigned short family)
1429 struct xfrmk_sadinfo {
1430 u32 sadhcnt; /* current hash bkts */
1431 u32 sadhmcnt; /* max allowed hash bkts */
1432 u32 sadcnt; /* current running count */
1435 struct xfrmk_spdinfo {
1446 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1448 extern int xfrm_state_delete(struct xfrm_state *x);
1449 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1450 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1451 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1452 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1453 extern int xfrm_init_replay(struct xfrm_state *x);
1454 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1455 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1456 extern int xfrm_init_state(struct xfrm_state *x);
1457 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1458 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1460 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1461 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1462 extern int xfrm_output(struct sk_buff *skb);
1463 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1464 extern int xfrm4_extract_header(struct sk_buff *skb);
1465 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1466 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1468 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1469 extern int xfrm4_rcv(struct sk_buff *skb);
1471 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1473 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1476 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1477 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1478 extern int xfrm4_output(struct sk_buff *skb);
1479 extern int xfrm4_output_finish(struct sk_buff *skb);
1480 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1481 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1482 extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler);
1483 extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler);
1484 extern int xfrm6_extract_header(struct sk_buff *skb);
1485 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1486 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1487 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1488 extern int xfrm6_rcv(struct sk_buff *skb);
1489 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1490 xfrm_address_t *saddr, u8 proto);
1491 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1492 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1493 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1494 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1495 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1496 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1497 extern int xfrm6_output(struct sk_buff *skb);
1498 extern int xfrm6_output_finish(struct sk_buff *skb);
1499 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1503 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1504 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1506 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1508 return -ENOPROTOOPT;
1511 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1513 /* should not happen */
1519 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1521 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1522 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1523 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1524 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1525 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1526 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1528 struct xfrm_selector *sel,
1529 struct xfrm_sec_ctx *ctx, int delete,
1531 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1532 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1533 u32 xfrm_get_acqseq(void);
1534 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1535 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1536 u8 mode, u32 reqid, u8 proto,
1537 const xfrm_address_t *daddr,
1538 const xfrm_address_t *saddr, int create,
1539 unsigned short family);
1540 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1542 #ifdef CONFIG_XFRM_MIGRATE
1543 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1544 const struct xfrm_migrate *m, int num_bundles,
1545 const struct xfrm_kmaddress *k);
1546 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1547 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1548 struct xfrm_migrate *m);
1549 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1550 struct xfrm_migrate *m, int num_bundles,
1551 struct xfrm_kmaddress *k);
1554 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1555 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1556 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1558 extern void xfrm_input_init(void);
1559 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1561 extern void xfrm_probe_algs(void);
1562 extern int xfrm_count_auth_supported(void);
1563 extern int xfrm_count_enc_supported(void);
1564 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1565 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1566 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1567 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1568 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1569 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1570 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1571 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1572 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1575 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1576 const xfrm_address_t *b,
1582 return (__force u32)a->a4 - (__force u32)b->a4;
1584 return ipv6_addr_cmp((const struct in6_addr *)a,
1585 (const struct in6_addr *)b);
1589 static inline int xfrm_policy_id2dir(u32 index)
1595 static inline int xfrm_aevent_is_on(struct net *net)
1601 nlsk = rcu_dereference(net->xfrm.nlsk);
1603 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1609 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1611 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1614 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1616 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1619 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1621 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1624 #ifdef CONFIG_XFRM_MIGRATE
1625 static inline int xfrm_replay_clone(struct xfrm_state *x,
1626 struct xfrm_state *orig)
1628 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1633 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1634 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1636 x->preplay_esn = kmemdup(x->replay_esn,
1637 xfrm_replay_state_esn_len(x->replay_esn),
1639 if (!x->preplay_esn) {
1640 kfree(x->replay_esn);
1647 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1649 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1652 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1654 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1657 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1660 for (i = 0; i < n; i++)
1661 xfrm_state_put(*(states + i));
1664 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1667 for (i = 0; i < n; i++)
1668 xfrm_state_delete(*(states + i));
1673 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1675 return skb->sp->xvec[skb->sp->len - 1];
1679 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1681 if (attrs[XFRMA_MARK])
1682 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1689 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1694 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1698 #endif /* _NET_XFRM_H */