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 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
42 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
43 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
45 #define XFRM_INC_STATS(net, field) ((void)(net))
46 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
47 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
50 extern struct mutex xfrm_cfg_mutex;
52 /* Organization of SPD aka "XFRM rules"
53 ------------------------------------
56 - policy rule, struct xfrm_policy (=SPD entry)
57 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
58 - instance of a transformer, struct xfrm_state (=SA)
59 - template to clone xfrm_state, struct xfrm_tmpl
61 SPD is plain linear list of xfrm_policy rules, ordered by priority.
62 (To be compatible with existing pfkeyv2 implementations,
63 many rules with priority of 0x7fffffff are allowed to exist and
64 such rules are ordered in an unpredictable way, thanks to bsd folks.)
66 Lookup is plain linear search until the first match with selector.
68 If "action" is "block", then we prohibit the flow, otherwise:
69 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
70 policy entry has list of up to XFRM_MAX_DEPTH transformations,
71 described by templates xfrm_tmpl. Each template is resolved
72 to a complete xfrm_state (see below) and we pack bundle of transformations
73 to a dst_entry returned to requestor.
75 dst -. xfrm .-> xfrm_state #1
76 |---. child .-> dst -. xfrm .-> xfrm_state #2
77 |---. child .-> dst -. xfrm .-> xfrm_state #3
80 Bundles are cached at xrfm_policy struct (field ->bundles).
83 Resolution of xrfm_tmpl
84 -----------------------
86 1. ->mode Mode: transport or tunnel
87 2. ->id.proto Protocol: AH/ESP/IPCOMP
88 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
89 Q: allow to resolve security gateway?
90 4. ->id.spi If not zero, static SPI.
91 5. ->saddr Local tunnel endpoint, ignored for transport mode.
92 6. ->algos List of allowed algos. Plain bitmask now.
93 Q: ealgos, aalgos, calgos. What a mess...
94 7. ->share Sharing mode.
95 Q: how to implement private sharing mode? To add struct sock* to
98 Having this template we search through SAD searching for entries
99 with appropriate mode/proto/algo, permitted by selector.
100 If no appropriate entry found, it is requested from key manager.
103 Q: How to find all the bundles referring to a physical path for
104 PMTU discovery? Seems, dst should contain list of all parents...
105 and enter to infinite locking hierarchy disaster.
106 No! It is easier, we will not search for them, let them find us.
107 We add genid to each dst plus pointer to genid of raw IP route,
108 pmtu disc will update pmtu on raw IP route and increase its genid.
109 dst_check() will see this for top level and trigger resyncing
110 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
113 struct xfrm_state_walk {
114 struct list_head all;
123 /* Full description of state of transformer. */
129 struct hlist_node gclist;
130 struct hlist_node bydst;
132 struct hlist_node bysrc;
133 struct hlist_node byspi;
139 struct xfrm_selector sel;
143 /* Key manager bits */
144 struct xfrm_state_walk km;
146 /* Parameters of this state. */
151 u8 aalgo, ealgo, calgo;
154 xfrm_address_t saddr;
159 struct xfrm_lifetime_cfg lft;
161 /* Data for transformer */
162 struct xfrm_algo *aalg;
163 struct xfrm_algo *ealg;
164 struct xfrm_algo *calg;
165 struct xfrm_algo_aead *aead;
167 /* Data for encapsulator */
168 struct xfrm_encap_tmpl *encap;
170 /* Data for care-of address */
171 xfrm_address_t *coaddr;
173 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
174 struct xfrm_state *tunnel;
176 /* If a tunnel, number of users + 1 */
177 atomic_t tunnel_users;
179 /* State for replay detection */
180 struct xfrm_replay_state replay;
182 /* Replay detection state at the time we sent the last notification */
183 struct xfrm_replay_state preplay;
185 /* internal flag that only holds state for delayed aevent at the
190 /* Replay detection notification settings */
194 /* Replay detection notification timer */
195 struct timer_list rtimer;
198 struct xfrm_stats stats;
200 struct xfrm_lifetime_cur curlft;
201 struct timer_list timer;
204 unsigned long lastused;
206 /* Reference to data common to all the instances of this
208 const struct xfrm_type *type;
209 struct xfrm_mode *inner_mode;
210 struct xfrm_mode *inner_mode_iaf;
211 struct xfrm_mode *outer_mode;
213 /* Security context */
214 struct xfrm_sec_ctx *security;
216 /* Private data of this transformer, format is opaque,
217 * interpreted by xfrm_type methods. */
221 static inline struct net *xs_net(struct xfrm_state *x)
223 return read_pnet(&x->xs_net);
226 /* xflags - make enum if more show up */
227 #define XFRM_TIME_DEFER 1
238 /* callback structure passed from either netlink or pfkey */
257 struct xfrm_policy_afinfo {
258 unsigned short family;
259 struct dst_ops *dst_ops;
260 void (*garbage_collect)(struct net *net);
261 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
262 xfrm_address_t *saddr,
263 xfrm_address_t *daddr);
264 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
265 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
266 void (*decode_session)(struct sk_buff *skb,
269 int (*get_tos)(struct flowi *fl);
270 int (*init_path)(struct xfrm_dst *path,
271 struct dst_entry *dst,
273 int (*fill_dst)(struct xfrm_dst *xdst,
274 struct net_device *dev);
277 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
278 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
279 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
280 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
283 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
284 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
285 extern int __xfrm_state_delete(struct xfrm_state *x);
287 struct xfrm_state_afinfo {
291 struct module *owner;
292 const struct xfrm_type *type_map[IPPROTO_MAX];
293 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
294 int (*init_flags)(struct xfrm_state *x);
295 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
296 struct xfrm_tmpl *tmpl,
297 xfrm_address_t *daddr, xfrm_address_t *saddr);
298 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
299 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
300 int (*output)(struct sk_buff *skb);
301 int (*extract_input)(struct xfrm_state *x,
302 struct sk_buff *skb);
303 int (*extract_output)(struct xfrm_state *x,
304 struct sk_buff *skb);
305 int (*transport_finish)(struct sk_buff *skb,
309 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
310 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
312 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
316 struct module *owner;
319 #define XFRM_TYPE_NON_FRAGMENT 1
320 #define XFRM_TYPE_REPLAY_PROT 2
321 #define XFRM_TYPE_LOCAL_COADDR 4
322 #define XFRM_TYPE_REMOTE_COADDR 8
324 int (*init_state)(struct xfrm_state *x);
325 void (*destructor)(struct xfrm_state *);
326 int (*input)(struct xfrm_state *, struct sk_buff *skb);
327 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
328 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
329 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
330 /* Estimate maximal size of result of transformation of a dgram */
331 u32 (*get_mtu)(struct xfrm_state *, int size);
334 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
335 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
339 * Remove encapsulation header.
341 * The IP header will be moved over the top of the encapsulation
344 * On entry, the transport header shall point to where the IP header
345 * should be and the network header shall be set to where the IP
346 * header currently is. skb->data shall point to the start of the
349 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
352 * This is the actual input entry point.
354 * For transport mode and equivalent this would be identical to
355 * input2 (which does not need to be set). While tunnel mode
356 * and equivalent would set this to the tunnel encapsulation function
357 * xfrm4_prepare_input that would in turn call input2.
359 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
362 * Add encapsulation header.
364 * On exit, the transport header will be set to the start of the
365 * encapsulation header to be filled in by x->type->output and
366 * the mac header will be set to the nextheader (protocol for
367 * IPv4) field of the extension header directly preceding the
368 * encapsulation header, or in its absence, that of the top IP
369 * header. The value of the network header will always point
370 * to the top IP header while skb->data will point to the payload.
372 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
375 * This is the actual output entry point.
377 * For transport mode and equivalent this would be identical to
378 * output2 (which does not need to be set). While tunnel mode
379 * and equivalent would set this to a tunnel encapsulation function
380 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
383 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
385 struct xfrm_state_afinfo *afinfo;
386 struct module *owner;
391 /* Flags for xfrm_mode. */
393 XFRM_MODE_FLAG_TUNNEL = 1,
396 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
397 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
399 static inline int xfrm_af2proto(unsigned int family)
411 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
413 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
414 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
415 return x->inner_mode;
417 return x->inner_mode_iaf;
421 /* id in template is interpreted as:
422 * daddr - destination of tunnel, may be zero for transport mode.
423 * spi - zero to acquire spi. Not zero if spi is static, then
424 * daddr must be fixed too.
425 * proto - AH/ESP/IPCOMP
429 /* Source address of tunnel. Ignored, if it is not a tunnel. */
430 xfrm_address_t saddr;
432 unsigned short encap_family;
436 /* Mode: transport, tunnel etc. */
439 /* Sharing mode: unique, this session only, this user only etc. */
442 /* May skip this transfomration if no SA is found */
445 /* Skip aalgos/ealgos/calgos checks. */
448 /* Bit mask of algos allowed for acquisition */
454 #define XFRM_MAX_DEPTH 6
456 struct xfrm_policy_walk_entry {
457 struct list_head all;
461 struct xfrm_policy_walk {
462 struct xfrm_policy_walk_entry walk;
471 struct hlist_node bydst;
472 struct hlist_node byidx;
474 /* This lock only affects elements except for entry. */
477 struct timer_list timer;
481 struct xfrm_selector selector;
482 struct xfrm_lifetime_cfg lft;
483 struct xfrm_lifetime_cur curlft;
484 struct dst_entry *bundles;
485 struct xfrm_policy_walk_entry walk;
491 struct xfrm_sec_ctx *security;
492 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
495 static inline struct net *xp_net(struct xfrm_policy *xp)
497 return read_pnet(&xp->xp_net);
500 struct xfrm_kmaddress {
501 xfrm_address_t local;
502 xfrm_address_t remote;
507 struct xfrm_migrate {
508 xfrm_address_t old_daddr;
509 xfrm_address_t old_saddr;
510 xfrm_address_t new_daddr;
511 xfrm_address_t new_saddr;
520 #define XFRM_KM_TIMEOUT 30
522 #define XFRM_REPLAY_SEQ 1
523 #define XFRM_REPLAY_OSEQ 2
524 #define XFRM_REPLAY_SEQ_MASK 3
526 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
527 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
529 /* default aevent timeout in units of 100ms */
530 #define XFRM_AE_ETIME 10
531 /* Async Event timer multiplier */
532 #define XFRM_AE_ETH_M 10
533 /* default seq threshold size */
534 #define XFRM_AE_SEQT_SIZE 2
537 struct list_head list;
539 int (*notify)(struct xfrm_state *x, struct km_event *c);
540 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
541 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
542 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
543 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
544 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
545 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
548 extern int xfrm_register_km(struct xfrm_mgr *km);
549 extern int xfrm_unregister_km(struct xfrm_mgr *km);
552 * This structure is used for the duration where packets are being
553 * transformed by IPsec. As soon as the packet leaves IPsec the
554 * area beyond the generic IP part may be overwritten.
558 struct inet_skb_parm h4;
559 struct inet6_skb_parm h6;
562 /* Sequence number for replay protection. */
569 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
572 * This structure is used by the afinfo prepare_input/prepare_output functions
573 * to transmit header information to the mode input/output functions.
575 struct xfrm_mode_skb_cb {
577 struct inet_skb_parm h4;
578 struct inet6_skb_parm h6;
581 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
585 /* IP header length (excluding options or extension headers). */
588 /* TOS for IPv4, class for IPv6. */
591 /* TTL for IPv4, hop limitfor IPv6. */
594 /* Protocol for IPv4, NH for IPv6. */
597 /* Option length for IPv4, zero for IPv6. */
600 /* Used by IPv6 only, zero for IPv4. */
604 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
607 * This structure is used by the input processing to locate the SPI and
608 * related information.
610 struct xfrm_spi_skb_cb {
612 struct inet_skb_parm h4;
613 struct inet6_skb_parm h6;
616 unsigned int daddroff;
620 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
622 /* Audit Information */
629 #ifdef CONFIG_AUDITSYSCALL
630 static inline struct audit_buffer *xfrm_audit_start(const char *op)
632 struct audit_buffer *audit_buf = NULL;
634 if (audit_enabled == 0)
636 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
637 AUDIT_MAC_IPSEC_EVENT);
638 if (audit_buf == NULL)
640 audit_log_format(audit_buf, "op=%s", op);
644 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
645 struct audit_buffer *audit_buf)
650 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
652 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
653 audit_log_format(audit_buf, " subj=%s", secctx);
654 security_release_secctx(secctx, secctx_len);
656 audit_log_task_context(audit_buf);
659 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
660 u32 auid, u32 ses, u32 secid);
661 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
662 u32 auid, u32 ses, u32 secid);
663 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
664 u32 auid, u32 ses, u32 secid);
665 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
666 u32 auid, u32 ses, u32 secid);
667 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
668 struct sk_buff *skb);
669 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
670 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
671 __be32 net_spi, __be32 net_seq);
672 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
673 struct sk_buff *skb, u8 proto);
676 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
677 u32 auid, u32 ses, u32 secid)
681 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
682 u32 auid, u32 ses, u32 secid)
686 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
687 u32 auid, u32 ses, u32 secid)
691 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
692 u32 auid, u32 ses, u32 secid)
696 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
701 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
706 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
707 __be32 net_spi, __be32 net_seq)
711 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
712 struct sk_buff *skb, u8 proto)
715 #endif /* CONFIG_AUDITSYSCALL */
717 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
719 if (likely(policy != NULL))
720 atomic_inc(&policy->refcnt);
723 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
725 static inline void xfrm_pol_put(struct xfrm_policy *policy)
727 if (atomic_dec_and_test(&policy->refcnt))
728 xfrm_policy_destroy(policy);
731 #ifdef CONFIG_XFRM_SUB_POLICY
732 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
735 for (i = npols - 1; i >= 0; --i)
736 xfrm_pol_put(pols[i]);
739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
741 xfrm_pol_put(pols[0]);
745 extern void __xfrm_state_destroy(struct xfrm_state *);
747 static inline void __xfrm_state_put(struct xfrm_state *x)
749 atomic_dec(&x->refcnt);
752 static inline void xfrm_state_put(struct xfrm_state *x)
754 if (atomic_dec_and_test(&x->refcnt))
755 __xfrm_state_destroy(x);
758 static inline void xfrm_state_hold(struct xfrm_state *x)
760 atomic_inc(&x->refcnt);
763 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
770 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
771 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
774 if (memcmp(a1, a2, pdw << 2))
780 mask = htonl((0xffffffff) << (32 - pbi));
782 if ((a1[pdw] ^ a2[pdw]) & mask)
790 __be16 xfrm_flowi_sport(struct flowi *fl)
796 case IPPROTO_UDPLITE:
798 port = fl->fl_ip_sport;
802 port = htons(fl->fl_icmp_type);
805 port = htons(fl->fl_mh_type);
814 __be16 xfrm_flowi_dport(struct flowi *fl)
820 case IPPROTO_UDPLITE:
822 port = fl->fl_ip_dport;
826 port = htons(fl->fl_icmp_code);
834 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
835 unsigned short family);
837 #ifdef CONFIG_SECURITY_NETWORK_XFRM
838 /* If neither has a context --> match
839 * Otherwise, both must have a context and the sids, doi, alg must match
841 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
843 return ((!s1 && !s2) ||
845 (s1->ctx_sid == s2->ctx_sid) &&
846 (s1->ctx_doi == s2->ctx_doi) &&
847 (s1->ctx_alg == s2->ctx_alg)));
850 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
856 /* A struct encoding bundle of transformations to apply to some set of flow.
858 * dst->child points to the next element of bundle.
859 * dst->xfrm points to an instanse of transformer.
861 * Due to unfortunate limitations of current routing cache, which we
862 * have no time to fix, it mirrors struct rtable and bound to the same
863 * routing key, including saddr,daddr. However, we can have many of
864 * bundles differing by session id. All the bundles grow from a parent
869 struct dst_entry dst;
873 struct dst_entry *route;
874 #ifdef CONFIG_XFRM_SUB_POLICY
875 struct flowi *origin;
876 struct xfrm_selector *partner;
879 u32 route_mtu_cached;
880 u32 child_mtu_cached;
886 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
888 dst_release(xdst->route);
889 if (likely(xdst->u.dst.xfrm))
890 xfrm_state_put(xdst->u.dst.xfrm);
891 #ifdef CONFIG_XFRM_SUB_POLICY
894 kfree(xdst->partner);
895 xdst->partner = NULL;
900 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
905 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
908 static inline struct sec_path *
909 secpath_get(struct sec_path *sp)
912 atomic_inc(&sp->refcnt);
916 extern void __secpath_destroy(struct sec_path *sp);
919 secpath_put(struct sec_path *sp)
921 if (sp && atomic_dec_and_test(&sp->refcnt))
922 __secpath_destroy(sp);
925 extern struct sec_path *secpath_dup(struct sec_path *src);
928 secpath_reset(struct sk_buff *skb)
931 secpath_put(skb->sp);
937 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
941 return addr->a4 == 0;
943 return ipv6_addr_any((struct in6_addr *)&addr->a6);
949 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
951 return (tmpl->saddr.a4 &&
952 tmpl->saddr.a4 != x->props.saddr.a4);
956 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
958 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
959 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
963 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
967 return __xfrm4_state_addr_cmp(tmpl, x);
969 return __xfrm6_state_addr_cmp(tmpl, x);
975 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
977 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
979 unsigned int family, int reverse)
981 struct net *net = dev_net(skb->dev);
982 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
984 if (sk && sk->sk_policy[XFRM_POLICY_IN])
985 return __xfrm_policy_check(sk, ndir, skb, family);
987 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
988 (skb_dst(skb)->flags & DST_NOPOLICY) ||
989 __xfrm_policy_check(sk, ndir, skb, family);
992 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
994 return __xfrm_policy_check2(sk, dir, skb, family, 0);
997 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
999 return xfrm_policy_check(sk, dir, skb, AF_INET);
1002 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1004 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1007 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1008 struct sk_buff *skb)
1010 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1013 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1014 struct sk_buff *skb)
1016 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1019 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1020 unsigned int family, int reverse);
1022 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023 unsigned int family)
1025 return __xfrm_decode_session(skb, fl, family, 0);
1028 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1030 unsigned int family)
1032 return __xfrm_decode_session(skb, fl, family, 1);
1035 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1037 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1039 struct net *net = dev_net(skb->dev);
1041 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1042 (skb_dst(skb)->flags & DST_NOXFRM) ||
1043 __xfrm_route_forward(skb, family);
1046 static inline int xfrm4_route_forward(struct sk_buff *skb)
1048 return xfrm_route_forward(skb, AF_INET);
1051 static inline int xfrm6_route_forward(struct sk_buff *skb)
1053 return xfrm_route_forward(skb, AF_INET6);
1056 extern int __xfrm_sk_clone_policy(struct sock *sk);
1058 static inline int xfrm_sk_clone_policy(struct sock *sk)
1060 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1061 return __xfrm_sk_clone_policy(sk);
1065 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1067 static inline void xfrm_sk_free_policy(struct sock *sk)
1069 if (unlikely(sk->sk_policy[0] != NULL)) {
1070 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1071 sk->sk_policy[0] = NULL;
1073 if (unlikely(sk->sk_policy[1] != NULL)) {
1074 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1075 sk->sk_policy[1] = NULL;
1081 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1082 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1083 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1084 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1085 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1099 unsigned int family)
1103 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1104 struct sk_buff *skb)
1108 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1109 struct sk_buff *skb)
1116 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1120 return (xfrm_address_t *)&fl->fl4_dst;
1122 return (xfrm_address_t *)&fl->fl6_dst;
1128 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1132 return (xfrm_address_t *)&fl->fl4_src;
1134 return (xfrm_address_t *)&fl->fl6_src;
1140 void xfrm_flowi_addr_get(struct flowi *fl,
1141 xfrm_address_t *saddr, xfrm_address_t *daddr,
1142 unsigned short family)
1146 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1147 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1150 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1151 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1156 static __inline__ int
1157 __xfrm4_state_addr_check(struct xfrm_state *x,
1158 xfrm_address_t *daddr, xfrm_address_t *saddr)
1160 if (daddr->a4 == x->id.daddr.a4 &&
1161 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1166 static __inline__ int
1167 __xfrm6_state_addr_check(struct xfrm_state *x,
1168 xfrm_address_t *daddr, xfrm_address_t *saddr)
1170 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1171 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1172 ipv6_addr_any((struct in6_addr *)saddr) ||
1173 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1178 static __inline__ int
1179 xfrm_state_addr_check(struct xfrm_state *x,
1180 xfrm_address_t *daddr, xfrm_address_t *saddr,
1181 unsigned short family)
1185 return __xfrm4_state_addr_check(x, daddr, saddr);
1187 return __xfrm6_state_addr_check(x, daddr, saddr);
1192 static __inline__ int
1193 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1194 unsigned short family)
1198 return __xfrm4_state_addr_check(x,
1199 (xfrm_address_t *)&fl->fl4_dst,
1200 (xfrm_address_t *)&fl->fl4_src);
1202 return __xfrm6_state_addr_check(x,
1203 (xfrm_address_t *)&fl->fl6_dst,
1204 (xfrm_address_t *)&fl->fl6_src);
1209 static inline int xfrm_state_kern(struct xfrm_state *x)
1211 return atomic_read(&x->tunnel_users);
1214 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1216 return (!userproto || proto == userproto ||
1217 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1218 proto == IPPROTO_ESP ||
1219 proto == IPPROTO_COMP)));
1223 * xfrm algorithm information
1225 struct xfrm_algo_aead_info {
1229 struct xfrm_algo_auth_info {
1234 struct xfrm_algo_encr_info {
1239 struct xfrm_algo_comp_info {
1243 struct xfrm_algo_desc {
1248 struct xfrm_algo_aead_info aead;
1249 struct xfrm_algo_auth_info auth;
1250 struct xfrm_algo_encr_info encr;
1251 struct xfrm_algo_comp_info comp;
1253 struct sadb_alg desc;
1256 /* XFRM tunnel handlers. */
1257 struct xfrm_tunnel {
1258 int (*handler)(struct sk_buff *skb);
1259 int (*err_handler)(struct sk_buff *skb, __u32 info);
1261 struct xfrm_tunnel *next;
1265 struct xfrm6_tunnel {
1266 int (*handler)(struct sk_buff *skb);
1267 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1268 u8 type, u8 code, int offset, __be32 info);
1269 struct xfrm6_tunnel *next;
1273 extern void xfrm_init(void);
1274 extern void xfrm4_init(int rt_hash_size);
1275 extern int xfrm_state_init(struct net *net);
1276 extern void xfrm_state_fini(struct net *net);
1277 extern void xfrm4_state_init(void);
1279 extern int xfrm6_init(void);
1280 extern void xfrm6_fini(void);
1281 extern int xfrm6_state_init(void);
1282 extern void xfrm6_state_fini(void);
1284 static inline int xfrm6_init(void)
1288 static inline void xfrm6_fini(void)
1294 #ifdef CONFIG_XFRM_STATISTICS
1295 extern int xfrm_proc_init(struct net *net);
1296 extern void xfrm_proc_fini(struct net *net);
1299 extern int xfrm_sysctl_init(struct net *net);
1300 #ifdef CONFIG_SYSCTL
1301 extern void xfrm_sysctl_fini(struct net *net);
1303 static inline void xfrm_sysctl_fini(struct net *net)
1308 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1309 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1310 int (*func)(struct xfrm_state *, int, void*), void *);
1311 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1312 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1313 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1314 struct flowi *fl, struct xfrm_tmpl *tmpl,
1315 struct xfrm_policy *pol, int *err,
1316 unsigned short family);
1317 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1318 xfrm_address_t *daddr,
1319 xfrm_address_t *saddr,
1320 unsigned short family,
1321 u8 mode, u8 proto, u32 reqid);
1322 extern int xfrm_state_check_expire(struct xfrm_state *x);
1323 extern void xfrm_state_insert(struct xfrm_state *x);
1324 extern int xfrm_state_add(struct xfrm_state *x);
1325 extern int xfrm_state_update(struct xfrm_state *x);
1326 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1327 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1328 #ifdef CONFIG_XFRM_SUB_POLICY
1329 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1330 int n, unsigned short family);
1331 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1332 int n, unsigned short family);
1334 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1335 int n, unsigned short family)
1340 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1341 int n, unsigned short family)
1347 struct xfrmk_sadinfo {
1348 u32 sadhcnt; /* current hash bkts */
1349 u32 sadhmcnt; /* max allowed hash bkts */
1350 u32 sadcnt; /* current running count */
1353 struct xfrmk_spdinfo {
1364 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1365 extern int xfrm_state_delete(struct xfrm_state *x);
1366 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1367 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1368 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1369 extern int xfrm_replay_check(struct xfrm_state *x,
1370 struct sk_buff *skb, __be32 seq);
1371 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1372 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1373 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1374 extern int xfrm_init_state(struct xfrm_state *x);
1375 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1376 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1378 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1379 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1380 extern int xfrm_output(struct sk_buff *skb);
1381 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1382 extern int xfrm4_extract_header(struct sk_buff *skb);
1383 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1384 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1386 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1387 extern int xfrm4_rcv(struct sk_buff *skb);
1389 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1391 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1394 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm4_output(struct sk_buff *skb);
1397 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1398 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1399 extern int xfrm6_extract_header(struct sk_buff *skb);
1400 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1401 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1402 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1403 extern int xfrm6_rcv(struct sk_buff *skb);
1404 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1405 xfrm_address_t *saddr, u8 proto);
1406 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1407 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1408 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1409 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1410 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1411 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1412 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1413 extern int xfrm6_output(struct sk_buff *skb);
1414 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1418 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1419 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1421 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1423 return -ENOPROTOOPT;
1426 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1428 /* should not happen */
1434 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1436 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1437 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1438 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1439 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1440 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1441 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1442 struct xfrm_selector *sel,
1443 struct xfrm_sec_ctx *ctx, int delete,
1445 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1446 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1447 u32 xfrm_get_acqseq(void);
1448 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1449 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1450 xfrm_address_t *daddr, xfrm_address_t *saddr,
1451 int create, unsigned short family);
1452 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1453 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1454 struct flowi *fl, int family, int strict);
1456 #ifdef CONFIG_XFRM_MIGRATE
1457 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles,
1459 struct xfrm_kmaddress *k);
1460 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1461 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1462 struct xfrm_migrate *m);
1463 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1464 struct xfrm_migrate *m, int num_bundles,
1465 struct xfrm_kmaddress *k);
1468 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1469 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1470 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1472 extern void xfrm_input_init(void);
1473 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1475 extern void xfrm_probe_algs(void);
1476 extern int xfrm_count_auth_supported(void);
1477 extern int xfrm_count_enc_supported(void);
1478 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1479 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1480 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1481 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1482 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1485 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1486 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1491 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1494 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1500 return (__force __u32)a->a4 - (__force __u32)b->a4;
1502 return ipv6_addr_cmp((struct in6_addr *)a,
1503 (struct in6_addr *)b);
1507 static inline int xfrm_policy_id2dir(u32 index)
1513 static inline int xfrm_aevent_is_on(struct net *net)
1519 nlsk = rcu_dereference(net->xfrm.nlsk);
1521 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1527 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1529 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1532 #ifdef CONFIG_XFRM_MIGRATE
1533 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1535 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1538 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1541 for (i = 0; i < n; i++)
1542 xfrm_state_put(*(states + i));
1545 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1548 for (i = 0; i < n; i++)
1549 xfrm_state_delete(*(states + i));
1554 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1556 return skb->sp->xvec[skb->sp->len - 1];
1560 #endif /* _NET_XFRM_H */