4 #include <linux/compiler.h>
6 #include <linux/xfrm.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13 #include <linux/in6.h>
14 #include <linux/mutex.h>
18 #include <net/route.h>
20 #include <net/ip6_fib.h>
22 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
24 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
26 extern struct sock *xfrm_nl;
27 extern u32 sysctl_xfrm_aevent_etime;
28 extern u32 sysctl_xfrm_aevent_rseqth;
30 extern struct mutex xfrm_cfg_mutex;
32 /* Organization of SPD aka "XFRM rules"
33 ------------------------------------
36 - policy rule, struct xfrm_policy (=SPD entry)
37 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
38 - instance of a transformer, struct xfrm_state (=SA)
39 - template to clone xfrm_state, struct xfrm_tmpl
41 SPD is plain linear list of xfrm_policy rules, ordered by priority.
42 (To be compatible with existing pfkeyv2 implementations,
43 many rules with priority of 0x7fffffff are allowed to exist and
44 such rules are ordered in an unpredictable way, thanks to bsd folks.)
46 Lookup is plain linear search until the first match with selector.
48 If "action" is "block", then we prohibit the flow, otherwise:
49 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
50 policy entry has list of up to XFRM_MAX_DEPTH transformations,
51 described by templates xfrm_tmpl. Each template is resolved
52 to a complete xfrm_state (see below) and we pack bundle of transformations
53 to a dst_entry returned to requestor.
55 dst -. xfrm .-> xfrm_state #1
56 |---. child .-> dst -. xfrm .-> xfrm_state #2
57 |---. child .-> dst -. xfrm .-> xfrm_state #3
60 Bundles are cached at xrfm_policy struct (field ->bundles).
63 Resolution of xrfm_tmpl
64 -----------------------
66 1. ->mode Mode: transport or tunnel
67 2. ->id.proto Protocol: AH/ESP/IPCOMP
68 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
69 Q: allow to resolve security gateway?
70 4. ->id.spi If not zero, static SPI.
71 5. ->saddr Local tunnel endpoint, ignored for transport mode.
72 6. ->algos List of allowed algos. Plain bitmask now.
73 Q: ealgos, aalgos, calgos. What a mess...
74 7. ->share Sharing mode.
75 Q: how to implement private sharing mode? To add struct sock* to
78 Having this template we search through SAD searching for entries
79 with appropriate mode/proto/algo, permitted by selector.
80 If no appropriate entry found, it is requested from key manager.
83 Q: How to find all the bundles referring to a physical path for
84 PMTU discovery? Seems, dst should contain list of all parents...
85 and enter to infinite locking hierarchy disaster.
86 No! It is easier, we will not search for them, let them find us.
87 We add genid to each dst plus pointer to genid of raw IP route,
88 pmtu disc will update pmtu on raw IP route and increase its genid.
89 dst_check() will see this for top level and trigger resyncing
90 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
93 /* Full description of state of transformer. */
96 /* Note: bydst is re-used during gc */
97 struct list_head bydst;
98 struct list_head bysrc;
99 struct list_head byspi;
105 struct xfrm_selector sel;
107 /* Key manger bits */
114 /* Parameters of this state. */
119 u8 aalgo, ealgo, calgo;
122 xfrm_address_t saddr;
127 struct xfrm_lifetime_cfg lft;
129 /* Data for transformer */
130 struct xfrm_algo *aalg;
131 struct xfrm_algo *ealg;
132 struct xfrm_algo *calg;
134 /* Data for encapsulator */
135 struct xfrm_encap_tmpl *encap;
137 /* Data for care-of address */
138 xfrm_address_t *coaddr;
140 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
141 struct xfrm_state *tunnel;
143 /* If a tunnel, number of users + 1 */
144 atomic_t tunnel_users;
146 /* State for replay detection */
147 struct xfrm_replay_state replay;
149 /* Replay detection state at the time we sent the last notification */
150 struct xfrm_replay_state preplay;
152 /* internal flag that only holds state for delayed aevent at the
157 /* Replay detection notification settings */
161 /* Replay detection notification timer */
162 struct timer_list rtimer;
165 struct xfrm_stats stats;
167 struct xfrm_lifetime_cur curlft;
168 struct timer_list timer;
173 /* Reference to data common to all the instances of this
175 struct xfrm_type *type;
176 struct xfrm_mode *mode;
178 /* Security context */
179 struct xfrm_sec_ctx *security;
181 /* Private data of this transformer, format is opaque,
182 * interpreted by xfrm_type methods. */
186 /* xflags - make enum if more show up */
187 #define XFRM_TIME_DEFER 1
198 /* callback structure passed from either netlink or pfkey */
215 struct xfrm_policy_afinfo {
216 unsigned short family;
217 struct xfrm_type *type_map[IPPROTO_MAX];
218 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
219 struct dst_ops *dst_ops;
220 void (*garbage_collect)(void);
221 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
222 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
223 int (*bundle_create)(struct xfrm_policy *policy,
224 struct xfrm_state **xfrm,
227 struct dst_entry **dst_p);
228 void (*decode_session)(struct sk_buff *skb,
232 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
233 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
234 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
235 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
236 #define XFRM_ACQ_EXPIRES 30
239 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
240 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
241 extern int __xfrm_state_delete(struct xfrm_state *x);
243 struct xfrm_state_afinfo {
244 unsigned short family;
245 struct list_head *state_bydst;
246 struct list_head *state_bysrc;
247 struct list_head *state_byspi;
248 int (*init_flags)(struct xfrm_state *x);
249 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
250 struct xfrm_tmpl *tmpl,
251 xfrm_address_t *daddr, xfrm_address_t *saddr);
252 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
253 struct xfrm_state *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
254 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
255 xfrm_address_t *daddr, xfrm_address_t *saddr,
259 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
262 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
267 struct module *owner;
270 #define XFRM_TYPE_NON_FRAGMENT 1
272 int (*init_state)(struct xfrm_state *x);
273 void (*destructor)(struct xfrm_state *);
274 int (*input)(struct xfrm_state *, struct sk_buff *skb);
275 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
276 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
277 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
278 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
279 /* Estimate maximal size of result of transformation of a dgram */
280 u32 (*get_max_size)(struct xfrm_state *, int size);
283 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
284 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
285 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
286 extern void xfrm_put_type(struct xfrm_type *type);
289 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
290 int (*output)(struct sk_buff *skb);
292 struct module *owner;
296 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
297 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
298 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
299 extern void xfrm_put_mode(struct xfrm_mode *mode);
303 /* id in template is interpreted as:
304 * daddr - destination of tunnel, may be zero for transport mode.
305 * spi - zero to acquire spi. Not zero if spi is static, then
306 * daddr must be fixed too.
307 * proto - AH/ESP/IPCOMP
311 /* Source address of tunnel. Ignored, if it is not a tunnel. */
312 xfrm_address_t saddr;
316 /* Mode: transport, tunnel etc. */
319 /* Sharing mode: unique, this session only, this user only etc. */
322 /* May skip this transfomration if no SA is found */
325 /* Bit mask of algos allowed for acquisition */
331 #define XFRM_MAX_DEPTH 6
335 struct xfrm_policy *next;
336 struct list_head list;
338 /* This lock only affects elements except for entry. */
341 struct timer_list timer;
345 struct xfrm_selector selector;
346 struct xfrm_lifetime_cfg lft;
347 struct xfrm_lifetime_cur curlft;
348 struct dst_entry *bundles;
354 struct xfrm_sec_ctx *security;
355 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
358 #define XFRM_KM_TIMEOUT 30
360 #define XFRM_REPLAY_SEQ 1
361 #define XFRM_REPLAY_OSEQ 2
362 #define XFRM_REPLAY_SEQ_MASK 3
364 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
365 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
367 /* default aevent timeout in units of 100ms */
368 #define XFRM_AE_ETIME 10
369 /* Async Event timer multiplier */
370 #define XFRM_AE_ETH_M 10
371 /* default seq threshold size */
372 #define XFRM_AE_SEQT_SIZE 2
376 struct list_head list;
378 int (*notify)(struct xfrm_state *x, struct km_event *c);
379 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
380 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
381 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
382 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
385 extern int xfrm_register_km(struct xfrm_mgr *km);
386 extern int xfrm_unregister_km(struct xfrm_mgr *km);
389 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
391 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
393 if (likely(policy != NULL))
394 atomic_inc(&policy->refcnt);
397 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
399 static inline void xfrm_pol_put(struct xfrm_policy *policy)
401 if (atomic_dec_and_test(&policy->refcnt))
402 __xfrm_policy_destroy(policy);
405 #define XFRM_DST_HSIZE 1024
408 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
412 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
417 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
420 h = ntohl(addr->a6[2]^addr->a6[3]);
421 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
426 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
430 return __xfrm4_dst_hash(addr);
432 return __xfrm6_dst_hash(addr);
438 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
440 return __xfrm4_dst_hash(addr);
444 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
446 return __xfrm6_dst_hash(addr);
450 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
454 return __xfrm4_src_hash(addr);
456 return __xfrm6_src_hash(addr);
462 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
465 h = ntohl(addr->a4^spi^proto);
466 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
471 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
474 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
475 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
480 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
484 return __xfrm4_spi_hash(addr, spi, proto);
486 return __xfrm6_spi_hash(addr, spi, proto);
491 extern void __xfrm_state_destroy(struct xfrm_state *);
493 static inline void __xfrm_state_put(struct xfrm_state *x)
495 atomic_dec(&x->refcnt);
498 static inline void xfrm_state_put(struct xfrm_state *x)
500 if (atomic_dec_and_test(&x->refcnt))
501 __xfrm_state_destroy(x);
504 static inline void xfrm_state_hold(struct xfrm_state *x)
506 atomic_inc(&x->refcnt);
509 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
516 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
517 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
520 if (memcmp(a1, a2, pdw << 2))
526 mask = htonl((0xffffffff) << (32 - pbi));
528 if ((a1[pdw] ^ a2[pdw]) & mask)
536 u16 xfrm_flowi_sport(struct flowi *fl)
543 port = fl->fl_ip_sport;
547 port = htons(fl->fl_icmp_type);
549 #ifdef CONFIG_IPV6_MIP6
551 port = htons(fl->fl_mh_type);
561 u16 xfrm_flowi_dport(struct flowi *fl)
568 port = fl->fl_ip_dport;
572 port = htons(fl->fl_icmp_code);
581 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
583 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
584 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
585 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
586 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
587 (fl->proto == sel->proto || !sel->proto) &&
588 (fl->oif == sel->ifindex || !sel->ifindex);
592 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
594 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
595 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
596 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
597 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
598 (fl->proto == sel->proto || !sel->proto) &&
599 (fl->oif == sel->ifindex || !sel->ifindex);
603 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
604 unsigned short family)
608 return __xfrm4_selector_match(sel, fl);
610 return __xfrm6_selector_match(sel, fl);
615 #ifdef CONFIG_SECURITY_NETWORK_XFRM
616 /* If neither has a context --> match
617 * Otherwise, both must have a context and the sids, doi, alg must match
619 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
621 return ((!s1 && !s2) ||
623 (s1->ctx_sid == s2->ctx_sid) &&
624 (s1->ctx_doi == s2->ctx_doi) &&
625 (s1->ctx_alg == s2->ctx_alg)));
628 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
634 /* A struct encoding bundle of transformations to apply to some set of flow.
636 * dst->child points to the next element of bundle.
637 * dst->xfrm points to an instanse of transformer.
639 * Due to unfortunate limitations of current routing cache, which we
640 * have no time to fix, it mirrors struct rtable and bound to the same
641 * routing key, including saddr,daddr. However, we can have many of
642 * bundles differing by session id. All the bundles grow from a parent
648 struct xfrm_dst *next;
649 struct dst_entry dst;
653 struct dst_entry *route;
654 u32 route_mtu_cached;
655 u32 child_mtu_cached;
660 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
662 dst_release(xdst->route);
663 if (likely(xdst->u.dst.xfrm))
664 xfrm_state_put(xdst->u.dst.xfrm);
667 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
673 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
676 static inline struct sec_path *
677 secpath_get(struct sec_path *sp)
680 atomic_inc(&sp->refcnt);
684 extern void __secpath_destroy(struct sec_path *sp);
687 secpath_put(struct sec_path *sp)
689 if (sp && atomic_dec_and_test(&sp->refcnt))
690 __secpath_destroy(sp);
693 extern struct sec_path *secpath_dup(struct sec_path *src);
696 secpath_reset(struct sk_buff *skb)
699 secpath_put(skb->sp);
705 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
707 return (tmpl->saddr.a4 &&
708 tmpl->saddr.a4 != x->props.saddr.a4);
712 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
714 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
715 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
719 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
723 return __xfrm4_state_addr_cmp(tmpl, x);
725 return __xfrm6_state_addr_cmp(tmpl, x);
732 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
734 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
736 if (sk && sk->sk_policy[XFRM_POLICY_IN])
737 return __xfrm_policy_check(sk, dir, skb, family);
739 return (!xfrm_policy_list[dir] && !skb->sp) ||
740 (skb->dst->flags & DST_NOPOLICY) ||
741 __xfrm_policy_check(sk, dir, skb, family);
744 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
746 return xfrm_policy_check(sk, dir, skb, AF_INET);
749 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
751 return xfrm_policy_check(sk, dir, skb, AF_INET6);
754 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
755 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
757 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
759 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
760 (skb->dst->flags & DST_NOXFRM) ||
761 __xfrm_route_forward(skb, family);
764 static inline int xfrm4_route_forward(struct sk_buff *skb)
766 return xfrm_route_forward(skb, AF_INET);
769 static inline int xfrm6_route_forward(struct sk_buff *skb)
771 return xfrm_route_forward(skb, AF_INET6);
774 extern int __xfrm_sk_clone_policy(struct sock *sk);
776 static inline int xfrm_sk_clone_policy(struct sock *sk)
778 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
779 return __xfrm_sk_clone_policy(sk);
783 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
785 static inline void xfrm_sk_free_policy(struct sock *sk)
787 if (unlikely(sk->sk_policy[0] != NULL)) {
788 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
789 sk->sk_policy[0] = NULL;
791 if (unlikely(sk->sk_policy[1] != NULL)) {
792 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
793 sk->sk_policy[1] = NULL;
799 static inline void xfrm_sk_free_policy(struct sock *sk) {}
800 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
801 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
802 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
803 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
807 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
811 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
818 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
822 return (xfrm_address_t *)&fl->fl4_dst;
824 return (xfrm_address_t *)&fl->fl6_dst;
830 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
834 return (xfrm_address_t *)&fl->fl4_src;
836 return (xfrm_address_t *)&fl->fl6_src;
841 static __inline__ int
842 __xfrm4_state_addr_check(struct xfrm_state *x,
843 xfrm_address_t *daddr, xfrm_address_t *saddr)
845 if (daddr->a4 == x->id.daddr.a4 &&
846 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
851 static __inline__ int
852 __xfrm6_state_addr_check(struct xfrm_state *x,
853 xfrm_address_t *daddr, xfrm_address_t *saddr)
855 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
856 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
857 ipv6_addr_any((struct in6_addr *)saddr) ||
858 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
863 static __inline__ int
864 xfrm_state_addr_check(struct xfrm_state *x,
865 xfrm_address_t *daddr, xfrm_address_t *saddr,
866 unsigned short family)
870 return __xfrm4_state_addr_check(x, daddr, saddr);
872 return __xfrm6_state_addr_check(x, daddr, saddr);
877 static __inline__ int
878 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
879 unsigned short family)
883 return __xfrm4_state_addr_check(x,
884 (xfrm_address_t *)&fl->fl4_dst,
885 (xfrm_address_t *)&fl->fl4_src);
887 return __xfrm6_state_addr_check(x,
888 (xfrm_address_t *)&fl->fl6_dst,
889 (xfrm_address_t *)&fl->fl6_src);
894 static inline int xfrm_state_kern(struct xfrm_state *x)
896 return atomic_read(&x->tunnel_users);
899 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
901 return (!userproto || proto == userproto ||
902 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
903 proto == IPPROTO_ESP ||
904 proto == IPPROTO_COMP)));
908 * xfrm algorithm information
910 struct xfrm_algo_auth_info {
915 struct xfrm_algo_encr_info {
920 struct xfrm_algo_comp_info {
924 struct xfrm_algo_desc {
929 struct xfrm_algo_auth_info auth;
930 struct xfrm_algo_encr_info encr;
931 struct xfrm_algo_comp_info comp;
933 struct sadb_alg desc;
936 /* XFRM tunnel handlers. */
938 int (*handler)(struct sk_buff *skb);
939 int (*err_handler)(struct sk_buff *skb, __u32 info);
941 struct xfrm_tunnel *next;
945 struct xfrm6_tunnel {
946 int (*handler)(struct sk_buff *skb);
947 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
948 int type, int code, int offset, __u32 info);
950 struct xfrm6_tunnel *next;
954 extern void xfrm_init(void);
955 extern void xfrm4_init(void);
956 extern void xfrm6_init(void);
957 extern void xfrm6_fini(void);
958 extern void xfrm_state_init(void);
959 extern void xfrm4_state_init(void);
960 extern void xfrm6_state_init(void);
961 extern void xfrm6_state_fini(void);
963 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
964 extern struct xfrm_state *xfrm_state_alloc(void);
965 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
966 struct flowi *fl, struct xfrm_tmpl *tmpl,
967 struct xfrm_policy *pol, int *err,
968 unsigned short family);
969 extern int xfrm_state_check_expire(struct xfrm_state *x);
970 extern void xfrm_state_insert(struct xfrm_state *x);
971 extern int xfrm_state_add(struct xfrm_state *x);
972 extern int xfrm_state_update(struct xfrm_state *x);
973 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
974 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
975 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
976 extern int xfrm_state_delete(struct xfrm_state *x);
977 extern void xfrm_state_flush(u8 proto);
978 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
979 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
980 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
981 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
982 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
983 extern int xfrm_init_state(struct xfrm_state *x);
984 extern int xfrm4_rcv(struct sk_buff *skb);
985 extern int xfrm4_output(struct sk_buff *skb);
986 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
987 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
988 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
989 extern int xfrm6_rcv(struct sk_buff **pskb);
990 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
991 xfrm_address_t *saddr, u8 proto);
992 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
993 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
994 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
995 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
996 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
997 extern int xfrm6_output(struct sk_buff *skb);
998 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1002 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
1003 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1004 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1006 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1008 return -ENOPROTOOPT;
1011 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
1013 /* should not happen */
1017 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1023 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1024 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
1025 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1026 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
1027 struct xfrm_sec_ctx *ctx, int delete);
1028 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
1029 void xfrm_policy_flush(void);
1030 u32 xfrm_get_acqseq(void);
1031 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1032 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1033 xfrm_address_t *daddr, xfrm_address_t *saddr,
1034 int create, unsigned short family);
1035 extern void xfrm_policy_flush(void);
1036 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1037 extern int xfrm_flush_bundles(void);
1038 extern void xfrm_flush_all_bundles(void);
1039 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family, int strict);
1040 extern void xfrm_init_pmtu(struct dst_entry *dst);
1042 extern wait_queue_head_t km_waitq;
1043 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1044 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1046 extern void xfrm_input_init(void);
1047 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1049 extern void xfrm_probe_algs(void);
1050 extern int xfrm_count_auth_supported(void);
1051 extern int xfrm_count_enc_supported(void);
1052 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1053 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1054 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1055 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1056 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1057 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1058 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1059 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1063 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1066 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1067 int offset, int len, icv_update_fn_t icv_update);
1069 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1075 return a->a4 - b->a4;
1077 return ipv6_addr_cmp((struct in6_addr *)a,
1078 (struct in6_addr *)b);
1082 static inline int xfrm_policy_id2dir(u32 index)
1087 static inline int xfrm_aevent_is_on(void)
1093 nlsk = rcu_dereference(xfrm_nl);
1095 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1100 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1102 if (xfrm_aevent_is_on())
1103 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1107 #endif /* _NET_XFRM_H */