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 u32 sysctl_xfrm_aevent_etime;
52 extern u32 sysctl_xfrm_aevent_rseqth;
53 extern int sysctl_xfrm_larval_drop;
54 extern u32 sysctl_xfrm_acq_expires;
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. */
136 struct hlist_node gclist;
137 struct hlist_node bydst;
139 struct hlist_node bysrc;
140 struct hlist_node byspi;
146 struct xfrm_selector sel;
150 /* Key manager bits */
151 struct xfrm_state_walk km;
153 /* Parameters of this state. */
158 u8 aalgo, ealgo, calgo;
161 xfrm_address_t saddr;
166 struct xfrm_lifetime_cfg lft;
168 /* Data for transformer */
169 struct xfrm_algo *aalg;
170 struct xfrm_algo *ealg;
171 struct xfrm_algo *calg;
172 struct xfrm_algo_aead *aead;
174 /* Data for encapsulator */
175 struct xfrm_encap_tmpl *encap;
177 /* Data for care-of address */
178 xfrm_address_t *coaddr;
180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181 struct xfrm_state *tunnel;
183 /* If a tunnel, number of users + 1 */
184 atomic_t tunnel_users;
186 /* State for replay detection */
187 struct xfrm_replay_state replay;
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
192 /* internal flag that only holds state for delayed aevent at the
197 /* Replay detection notification settings */
201 /* Replay detection notification timer */
202 struct timer_list rtimer;
205 struct xfrm_stats stats;
207 struct xfrm_lifetime_cur curlft;
208 struct timer_list timer;
211 unsigned long lastused;
213 /* Reference to data common to all the instances of this
215 const struct xfrm_type *type;
216 struct xfrm_mode *inner_mode;
217 struct xfrm_mode *inner_mode_iaf;
218 struct xfrm_mode *outer_mode;
220 /* Security context */
221 struct xfrm_sec_ctx *security;
223 /* Private data of this transformer, format is opaque,
224 * interpreted by xfrm_type methods. */
228 static inline struct net *xs_net(struct xfrm_state *x)
230 return read_pnet(&x->xs_net);
233 /* xflags - make enum if more show up */
234 #define XFRM_TIME_DEFER 1
245 /* callback structure passed from either netlink or pfkey */
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(struct net *net);
269 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
270 xfrm_address_t *saddr,
271 xfrm_address_t *daddr);
272 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
273 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
274 void (*decode_session)(struct sk_buff *skb,
277 int (*get_tos)(struct flowi *fl);
278 int (*init_path)(struct xfrm_dst *path,
279 struct dst_entry *dst,
281 int (*fill_dst)(struct xfrm_dst *xdst,
282 struct net_device *dev);
285 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
287 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
288 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
291 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
292 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
293 extern int __xfrm_state_delete(struct xfrm_state *x);
295 struct xfrm_state_afinfo {
299 struct module *owner;
300 const struct xfrm_type *type_map[IPPROTO_MAX];
301 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
302 int (*init_flags)(struct xfrm_state *x);
303 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
304 struct xfrm_tmpl *tmpl,
305 xfrm_address_t *daddr, xfrm_address_t *saddr);
306 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
307 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
308 int (*output)(struct sk_buff *skb);
309 int (*extract_input)(struct xfrm_state *x,
310 struct sk_buff *skb);
311 int (*extract_output)(struct xfrm_state *x,
312 struct sk_buff *skb);
313 int (*transport_finish)(struct sk_buff *skb,
317 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
318 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
320 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
325 struct module *owner;
328 #define XFRM_TYPE_NON_FRAGMENT 1
329 #define XFRM_TYPE_REPLAY_PROT 2
330 #define XFRM_TYPE_LOCAL_COADDR 4
331 #define XFRM_TYPE_REMOTE_COADDR 8
333 int (*init_state)(struct xfrm_state *x);
334 void (*destructor)(struct xfrm_state *);
335 int (*input)(struct xfrm_state *, struct sk_buff *skb);
336 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
337 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
338 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
339 /* Estimate maximal size of result of transformation of a dgram */
340 u32 (*get_mtu)(struct xfrm_state *, int size);
343 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
344 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
348 * Remove encapsulation header.
350 * The IP header will be moved over the top of the encapsulation
353 * On entry, the transport header shall point to where the IP header
354 * should be and the network header shall be set to where the IP
355 * header currently is. skb->data shall point to the start of the
358 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
361 * This is the actual input entry point.
363 * For transport mode and equivalent this would be identical to
364 * input2 (which does not need to be set). While tunnel mode
365 * and equivalent would set this to the tunnel encapsulation function
366 * xfrm4_prepare_input that would in turn call input2.
368 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
371 * Add encapsulation header.
373 * On exit, the transport header will be set to the start of the
374 * encapsulation header to be filled in by x->type->output and
375 * the mac header will be set to the nextheader (protocol for
376 * IPv4) field of the extension header directly preceding the
377 * encapsulation header, or in its absence, that of the top IP
378 * header. The value of the network header will always point
379 * to the top IP header while skb->data will point to the payload.
381 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
384 * This is the actual output entry point.
386 * For transport mode and equivalent this would be identical to
387 * output2 (which does not need to be set). While tunnel mode
388 * and equivalent would set this to a tunnel encapsulation function
389 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
392 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
394 struct xfrm_state_afinfo *afinfo;
395 struct module *owner;
400 /* Flags for xfrm_mode. */
402 XFRM_MODE_FLAG_TUNNEL = 1,
405 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
406 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
408 static inline int xfrm_af2proto(unsigned int family)
420 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
422 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
423 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
424 return x->inner_mode;
426 return x->inner_mode_iaf;
431 /* id in template is interpreted as:
432 * daddr - destination of tunnel, may be zero for transport mode.
433 * spi - zero to acquire spi. Not zero if spi is static, then
434 * daddr must be fixed too.
435 * proto - AH/ESP/IPCOMP
439 /* Source address of tunnel. Ignored, if it is not a tunnel. */
440 xfrm_address_t saddr;
442 unsigned short encap_family;
446 /* Mode: transport, tunnel etc. */
449 /* Sharing mode: unique, this session only, this user only etc. */
452 /* May skip this transfomration if no SA is found */
455 /* Skip aalgos/ealgos/calgos checks. */
458 /* Bit mask of algos allowed for acquisition */
464 #define XFRM_MAX_DEPTH 6
466 struct xfrm_policy_walk_entry {
467 struct list_head all;
471 struct xfrm_policy_walk {
472 struct xfrm_policy_walk_entry walk;
482 struct hlist_node bydst;
483 struct hlist_node byidx;
485 /* This lock only affects elements except for entry. */
488 struct timer_list timer;
492 struct xfrm_selector selector;
493 struct xfrm_lifetime_cfg lft;
494 struct xfrm_lifetime_cur curlft;
495 struct dst_entry *bundles;
496 struct xfrm_policy_walk_entry walk;
502 struct xfrm_sec_ctx *security;
503 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
506 static inline struct net *xp_net(struct xfrm_policy *xp)
508 return read_pnet(&xp->xp_net);
511 struct xfrm_kmaddress {
512 xfrm_address_t local;
513 xfrm_address_t remote;
518 struct xfrm_migrate {
519 xfrm_address_t old_daddr;
520 xfrm_address_t old_saddr;
521 xfrm_address_t new_daddr;
522 xfrm_address_t new_saddr;
531 #define XFRM_KM_TIMEOUT 30
533 #define XFRM_REPLAY_SEQ 1
534 #define XFRM_REPLAY_OSEQ 2
535 #define XFRM_REPLAY_SEQ_MASK 3
537 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
538 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
540 /* default aevent timeout in units of 100ms */
541 #define XFRM_AE_ETIME 10
542 /* Async Event timer multiplier */
543 #define XFRM_AE_ETH_M 10
544 /* default seq threshold size */
545 #define XFRM_AE_SEQT_SIZE 2
549 struct list_head list;
551 int (*notify)(struct xfrm_state *x, struct km_event *c);
552 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
553 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
554 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
555 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
556 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
557 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
560 extern int xfrm_register_km(struct xfrm_mgr *km);
561 extern int xfrm_unregister_km(struct xfrm_mgr *km);
564 * This structure is used for the duration where packets are being
565 * transformed by IPsec. As soon as the packet leaves IPsec the
566 * area beyond the generic IP part may be overwritten.
570 struct inet_skb_parm h4;
571 struct inet6_skb_parm h6;
574 /* Sequence number for replay protection. */
581 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
584 * This structure is used by the afinfo prepare_input/prepare_output functions
585 * to transmit header information to the mode input/output functions.
587 struct xfrm_mode_skb_cb {
589 struct inet_skb_parm h4;
590 struct inet6_skb_parm h6;
593 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
597 /* IP header length (excluding options or extension headers). */
600 /* TOS for IPv4, class for IPv6. */
603 /* TTL for IPv4, hop limitfor IPv6. */
606 /* Protocol for IPv4, NH for IPv6. */
609 /* Option length for IPv4, zero for IPv6. */
612 /* Used by IPv6 only, zero for IPv4. */
616 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
619 * This structure is used by the input processing to locate the SPI and
620 * related information.
622 struct xfrm_spi_skb_cb {
624 struct inet_skb_parm h4;
625 struct inet6_skb_parm h6;
628 unsigned int daddroff;
632 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
634 /* Audit Information */
642 #ifdef CONFIG_AUDITSYSCALL
643 static inline struct audit_buffer *xfrm_audit_start(const char *op)
645 struct audit_buffer *audit_buf = NULL;
647 if (audit_enabled == 0)
649 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
650 AUDIT_MAC_IPSEC_EVENT);
651 if (audit_buf == NULL)
653 audit_log_format(audit_buf, "op=%s", op);
657 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
658 struct audit_buffer *audit_buf)
663 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
665 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
666 audit_log_format(audit_buf, " subj=%s", secctx);
667 security_release_secctx(secctx, secctx_len);
669 audit_log_task_context(audit_buf);
672 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
673 u32 auid, u32 ses, u32 secid);
674 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
675 u32 auid, u32 ses, u32 secid);
676 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
677 u32 auid, u32 ses, u32 secid);
678 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
679 u32 auid, u32 ses, u32 secid);
680 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
681 struct sk_buff *skb);
682 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
683 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
684 __be32 net_spi, __be32 net_seq);
685 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
686 struct sk_buff *skb, u8 proto);
689 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
690 u32 auid, u32 ses, u32 secid)
694 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
695 u32 auid, u32 ses, u32 secid)
699 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
700 u32 auid, u32 ses, u32 secid)
704 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
705 u32 auid, u32 ses, u32 secid)
709 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
714 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
719 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
720 __be32 net_spi, __be32 net_seq)
724 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
725 struct sk_buff *skb, u8 proto)
728 #endif /* CONFIG_AUDITSYSCALL */
730 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
732 if (likely(policy != NULL))
733 atomic_inc(&policy->refcnt);
736 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
738 static inline void xfrm_pol_put(struct xfrm_policy *policy)
740 if (atomic_dec_and_test(&policy->refcnt))
741 xfrm_policy_destroy(policy);
744 #ifdef CONFIG_XFRM_SUB_POLICY
745 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
748 for (i = npols - 1; i >= 0; --i)
749 xfrm_pol_put(pols[i]);
752 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
754 xfrm_pol_put(pols[0]);
758 extern void __xfrm_state_destroy(struct xfrm_state *);
760 static inline void __xfrm_state_put(struct xfrm_state *x)
762 atomic_dec(&x->refcnt);
765 static inline void xfrm_state_put(struct xfrm_state *x)
767 if (atomic_dec_and_test(&x->refcnt))
768 __xfrm_state_destroy(x);
771 static inline void xfrm_state_hold(struct xfrm_state *x)
773 atomic_inc(&x->refcnt);
776 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
783 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
784 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
787 if (memcmp(a1, a2, pdw << 2))
793 mask = htonl((0xffffffff) << (32 - pbi));
795 if ((a1[pdw] ^ a2[pdw]) & mask)
803 __be16 xfrm_flowi_sport(struct flowi *fl)
809 case IPPROTO_UDPLITE:
811 port = fl->fl_ip_sport;
815 port = htons(fl->fl_icmp_type);
818 port = htons(fl->fl_mh_type);
827 __be16 xfrm_flowi_dport(struct flowi *fl)
833 case IPPROTO_UDPLITE:
835 port = fl->fl_ip_dport;
839 port = htons(fl->fl_icmp_code);
847 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
848 unsigned short family);
850 #ifdef CONFIG_SECURITY_NETWORK_XFRM
851 /* If neither has a context --> match
852 * Otherwise, both must have a context and the sids, doi, alg must match
854 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
856 return ((!s1 && !s2) ||
858 (s1->ctx_sid == s2->ctx_sid) &&
859 (s1->ctx_doi == s2->ctx_doi) &&
860 (s1->ctx_alg == s2->ctx_alg)));
863 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
869 /* A struct encoding bundle of transformations to apply to some set of flow.
871 * dst->child points to the next element of bundle.
872 * dst->xfrm points to an instanse of transformer.
874 * Due to unfortunate limitations of current routing cache, which we
875 * have no time to fix, it mirrors struct rtable and bound to the same
876 * routing key, including saddr,daddr. However, we can have many of
877 * bundles differing by session id. All the bundles grow from a parent
883 struct dst_entry dst;
887 struct dst_entry *route;
888 #ifdef CONFIG_XFRM_SUB_POLICY
889 struct flowi *origin;
890 struct xfrm_selector *partner;
893 u32 route_mtu_cached;
894 u32 child_mtu_cached;
900 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
902 dst_release(xdst->route);
903 if (likely(xdst->u.dst.xfrm))
904 xfrm_state_put(xdst->u.dst.xfrm);
905 #ifdef CONFIG_XFRM_SUB_POLICY
908 kfree(xdst->partner);
909 xdst->partner = NULL;
914 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
920 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
923 static inline struct sec_path *
924 secpath_get(struct sec_path *sp)
927 atomic_inc(&sp->refcnt);
931 extern void __secpath_destroy(struct sec_path *sp);
934 secpath_put(struct sec_path *sp)
936 if (sp && atomic_dec_and_test(&sp->refcnt))
937 __secpath_destroy(sp);
940 extern struct sec_path *secpath_dup(struct sec_path *src);
943 secpath_reset(struct sk_buff *skb)
946 secpath_put(skb->sp);
952 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
956 return addr->a4 == 0;
958 return ipv6_addr_any((struct in6_addr *)&addr->a6);
964 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
966 return (tmpl->saddr.a4 &&
967 tmpl->saddr.a4 != x->props.saddr.a4);
971 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
973 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
974 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
978 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
982 return __xfrm4_state_addr_cmp(tmpl, x);
984 return __xfrm6_state_addr_cmp(tmpl, x);
990 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
992 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
994 unsigned int family, int reverse)
996 struct net *net = dev_net(skb->dev);
997 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
999 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1000 return __xfrm_policy_check(sk, ndir, skb, family);
1002 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1003 (skb->dst->flags & DST_NOPOLICY) ||
1004 __xfrm_policy_check(sk, ndir, skb, family);
1007 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1009 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1012 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1014 return xfrm_policy_check(sk, dir, skb, AF_INET);
1017 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1019 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1022 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1023 struct sk_buff *skb)
1025 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1028 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1029 struct sk_buff *skb)
1031 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1034 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1035 unsigned int family, int reverse);
1037 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1038 unsigned int family)
1040 return __xfrm_decode_session(skb, fl, family, 0);
1043 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1045 unsigned int family)
1047 return __xfrm_decode_session(skb, fl, family, 1);
1050 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1052 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1054 struct net *net = dev_net(skb->dev);
1056 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1057 (skb->dst->flags & DST_NOXFRM) ||
1058 __xfrm_route_forward(skb, family);
1061 static inline int xfrm4_route_forward(struct sk_buff *skb)
1063 return xfrm_route_forward(skb, AF_INET);
1066 static inline int xfrm6_route_forward(struct sk_buff *skb)
1068 return xfrm_route_forward(skb, AF_INET6);
1071 extern int __xfrm_sk_clone_policy(struct sock *sk);
1073 static inline int xfrm_sk_clone_policy(struct sock *sk)
1075 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1076 return __xfrm_sk_clone_policy(sk);
1080 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1082 static inline void xfrm_sk_free_policy(struct sock *sk)
1084 if (unlikely(sk->sk_policy[0] != NULL)) {
1085 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1086 sk->sk_policy[0] = NULL;
1088 if (unlikely(sk->sk_policy[1] != NULL)) {
1089 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1090 sk->sk_policy[1] = NULL;
1096 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1097 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1098 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1099 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1100 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1104 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1108 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1112 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1114 unsigned int family)
1118 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1119 struct sk_buff *skb)
1123 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1124 struct sk_buff *skb)
1131 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1135 return (xfrm_address_t *)&fl->fl4_dst;
1137 return (xfrm_address_t *)&fl->fl6_dst;
1143 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1147 return (xfrm_address_t *)&fl->fl4_src;
1149 return (xfrm_address_t *)&fl->fl6_src;
1155 void xfrm_flowi_addr_get(struct flowi *fl,
1156 xfrm_address_t *saddr, xfrm_address_t *daddr,
1157 unsigned short family)
1161 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1162 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1165 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1166 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1171 static __inline__ int
1172 __xfrm4_state_addr_check(struct xfrm_state *x,
1173 xfrm_address_t *daddr, xfrm_address_t *saddr)
1175 if (daddr->a4 == x->id.daddr.a4 &&
1176 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1181 static __inline__ int
1182 __xfrm6_state_addr_check(struct xfrm_state *x,
1183 xfrm_address_t *daddr, xfrm_address_t *saddr)
1185 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1186 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1187 ipv6_addr_any((struct in6_addr *)saddr) ||
1188 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1193 static __inline__ int
1194 xfrm_state_addr_check(struct xfrm_state *x,
1195 xfrm_address_t *daddr, xfrm_address_t *saddr,
1196 unsigned short family)
1200 return __xfrm4_state_addr_check(x, daddr, saddr);
1202 return __xfrm6_state_addr_check(x, daddr, saddr);
1207 static __inline__ int
1208 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1209 unsigned short family)
1213 return __xfrm4_state_addr_check(x,
1214 (xfrm_address_t *)&fl->fl4_dst,
1215 (xfrm_address_t *)&fl->fl4_src);
1217 return __xfrm6_state_addr_check(x,
1218 (xfrm_address_t *)&fl->fl6_dst,
1219 (xfrm_address_t *)&fl->fl6_src);
1224 static inline int xfrm_state_kern(struct xfrm_state *x)
1226 return atomic_read(&x->tunnel_users);
1229 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1231 return (!userproto || proto == userproto ||
1232 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1233 proto == IPPROTO_ESP ||
1234 proto == IPPROTO_COMP)));
1238 * xfrm algorithm information
1240 struct xfrm_algo_aead_info {
1244 struct xfrm_algo_auth_info {
1249 struct xfrm_algo_encr_info {
1254 struct xfrm_algo_comp_info {
1258 struct xfrm_algo_desc {
1263 struct xfrm_algo_aead_info aead;
1264 struct xfrm_algo_auth_info auth;
1265 struct xfrm_algo_encr_info encr;
1266 struct xfrm_algo_comp_info comp;
1268 struct sadb_alg desc;
1271 /* XFRM tunnel handlers. */
1272 struct xfrm_tunnel {
1273 int (*handler)(struct sk_buff *skb);
1274 int (*err_handler)(struct sk_buff *skb, __u32 info);
1276 struct xfrm_tunnel *next;
1280 struct xfrm6_tunnel {
1281 int (*handler)(struct sk_buff *skb);
1282 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1283 int type, int code, int offset, __be32 info);
1284 struct xfrm6_tunnel *next;
1288 extern void xfrm_init(void);
1289 extern void xfrm4_init(void);
1290 extern int xfrm_state_init(struct net *net);
1291 extern void xfrm_state_fini(struct net *net);
1292 extern void xfrm4_state_init(void);
1294 extern int xfrm6_init(void);
1295 extern void xfrm6_fini(void);
1296 extern int xfrm6_state_init(void);
1297 extern void xfrm6_state_fini(void);
1299 static inline int xfrm6_init(void)
1303 static inline void xfrm6_fini(void)
1309 #ifdef CONFIG_XFRM_STATISTICS
1310 extern int xfrm_proc_init(void);
1313 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1314 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1315 int (*func)(struct xfrm_state *, int, void*), void *);
1316 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1317 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1318 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1319 struct flowi *fl, struct xfrm_tmpl *tmpl,
1320 struct xfrm_policy *pol, int *err,
1321 unsigned short family);
1322 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1323 xfrm_address_t *daddr,
1324 xfrm_address_t *saddr,
1325 unsigned short family,
1326 u8 mode, u8 proto, u32 reqid);
1327 extern int xfrm_state_check_expire(struct xfrm_state *x);
1328 extern void xfrm_state_insert(struct xfrm_state *x);
1329 extern int xfrm_state_add(struct xfrm_state *x);
1330 extern int xfrm_state_update(struct xfrm_state *x);
1331 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1332 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1333 #ifdef CONFIG_XFRM_SUB_POLICY
1334 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1335 int n, unsigned short family);
1336 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1337 int n, unsigned short family);
1339 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1340 int n, unsigned short family)
1345 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1346 int n, unsigned short family)
1352 struct xfrmk_sadinfo {
1353 u32 sadhcnt; /* current hash bkts */
1354 u32 sadhmcnt; /* max allowed hash bkts */
1355 u32 sadcnt; /* current running count */
1358 struct xfrmk_spdinfo {
1369 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1370 extern int xfrm_state_delete(struct xfrm_state *x);
1371 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1372 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1373 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1374 extern int xfrm_replay_check(struct xfrm_state *x,
1375 struct sk_buff *skb, __be32 seq);
1376 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1377 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1378 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1379 extern int xfrm_init_state(struct xfrm_state *x);
1380 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1383 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1384 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1385 extern int xfrm_output(struct sk_buff *skb);
1386 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm4_extract_header(struct sk_buff *skb);
1388 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1391 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1392 extern int xfrm4_rcv(struct sk_buff *skb);
1394 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1396 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1399 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1400 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1401 extern int xfrm4_output(struct sk_buff *skb);
1402 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1403 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1404 extern int xfrm6_extract_header(struct sk_buff *skb);
1405 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1406 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1407 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1408 extern int xfrm6_rcv(struct sk_buff *skb);
1409 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1410 xfrm_address_t *saddr, u8 proto);
1411 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1412 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1413 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1414 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1415 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1416 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1417 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1418 extern int xfrm6_output(struct sk_buff *skb);
1419 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1423 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1424 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1426 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1428 return -ENOPROTOOPT;
1431 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1433 /* should not happen */
1439 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1441 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1442 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1443 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1444 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1445 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1446 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1447 struct xfrm_selector *sel,
1448 struct xfrm_sec_ctx *ctx, int delete,
1450 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1451 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1452 u32 xfrm_get_acqseq(void);
1453 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1454 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1455 xfrm_address_t *daddr, xfrm_address_t *saddr,
1456 int create, unsigned short family);
1457 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1458 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1459 struct flowi *fl, int family, int strict);
1461 #ifdef CONFIG_XFRM_MIGRATE
1462 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1463 struct xfrm_migrate *m, int num_bundles,
1464 struct xfrm_kmaddress *k);
1465 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1466 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1467 struct xfrm_migrate *m);
1468 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1469 struct xfrm_migrate *m, int num_bundles,
1470 struct xfrm_kmaddress *k);
1473 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1474 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1475 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1477 extern void xfrm_input_init(void);
1478 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1480 extern void xfrm_probe_algs(void);
1481 extern int xfrm_count_auth_supported(void);
1482 extern int xfrm_count_enc_supported(void);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1485 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1486 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1487 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1488 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1489 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1490 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1491 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1496 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1499 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1500 int offset, int len, icv_update_fn_t icv_update);
1502 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1508 return (__force __u32)a->a4 - (__force __u32)b->a4;
1510 return ipv6_addr_cmp((struct in6_addr *)a,
1511 (struct in6_addr *)b);
1515 static inline int xfrm_policy_id2dir(u32 index)
1521 static inline int xfrm_aevent_is_on(struct net *net)
1527 nlsk = rcu_dereference(net->xfrm.nlsk);
1529 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1535 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1537 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1540 #ifdef CONFIG_XFRM_MIGRATE
1541 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1543 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1546 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1549 for (i = 0; i < n; i++)
1550 xfrm_state_put(*(states + i));
1553 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1556 for (i = 0; i < n; i++)
1557 xfrm_state_delete(*(states + i));
1562 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1564 return skb->sp->xvec[skb->sp->len - 1];
1568 #endif /* _NET_XFRM_H */