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 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
138 struct xfrm_state *tunnel;
140 /* If a tunnel, number of users + 1 */
141 atomic_t tunnel_users;
143 /* State for replay detection */
144 struct xfrm_replay_state replay;
146 /* Replay detection state at the time we sent the last notification */
147 struct xfrm_replay_state preplay;
149 /* internal flag that only holds state for delayed aevent at the
154 /* Replay detection notification settings */
158 /* Replay detection notification timer */
159 struct timer_list rtimer;
162 struct xfrm_stats stats;
164 struct xfrm_lifetime_cur curlft;
165 struct timer_list timer;
167 /* Reference to data common to all the instances of this
169 struct xfrm_type *type;
170 struct xfrm_mode *mode;
172 /* Security context */
173 struct xfrm_sec_ctx *security;
175 /* Private data of this transformer, format is opaque,
176 * interpreted by xfrm_type methods. */
180 /* xflags - make enum if more show up */
181 #define XFRM_TIME_DEFER 1
192 /* callback structure passed from either netlink or pfkey */
209 struct xfrm_policy_afinfo {
210 unsigned short family;
211 struct xfrm_type *type_map[IPPROTO_MAX];
212 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
213 struct dst_ops *dst_ops;
214 void (*garbage_collect)(void);
215 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
216 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
217 int (*bundle_create)(struct xfrm_policy *policy,
218 struct xfrm_state **xfrm,
221 struct dst_entry **dst_p);
222 void (*decode_session)(struct sk_buff *skb,
226 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
227 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
228 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
229 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
230 #define XFRM_ACQ_EXPIRES 30
233 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
234 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
235 extern int __xfrm_state_delete(struct xfrm_state *x);
237 struct xfrm_state_afinfo {
238 unsigned short family;
239 struct list_head *state_bydst;
240 struct list_head *state_bysrc;
241 struct list_head *state_byspi;
242 int (*init_flags)(struct xfrm_state *x);
243 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
244 struct xfrm_tmpl *tmpl,
245 xfrm_address_t *daddr, xfrm_address_t *saddr);
246 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
247 struct xfrm_state *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
248 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
249 xfrm_address_t *daddr, xfrm_address_t *saddr,
253 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
254 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
256 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
261 struct module *owner;
264 int (*init_state)(struct xfrm_state *x);
265 void (*destructor)(struct xfrm_state *);
266 int (*input)(struct xfrm_state *, struct sk_buff *skb);
267 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
268 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
269 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
270 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
271 /* Estimate maximal size of result of transformation of a dgram */
272 u32 (*get_max_size)(struct xfrm_state *, int size);
275 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
276 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
277 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
278 extern void xfrm_put_type(struct xfrm_type *type);
281 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
282 int (*output)(struct sk_buff *skb);
284 struct module *owner;
288 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
289 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
290 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
291 extern void xfrm_put_mode(struct xfrm_mode *mode);
295 /* id in template is interpreted as:
296 * daddr - destination of tunnel, may be zero for transport mode.
297 * spi - zero to acquire spi. Not zero if spi is static, then
298 * daddr must be fixed too.
299 * proto - AH/ESP/IPCOMP
303 /* Source address of tunnel. Ignored, if it is not a tunnel. */
304 xfrm_address_t saddr;
308 /* Mode: transport, tunnel etc. */
311 /* Sharing mode: unique, this session only, this user only etc. */
314 /* May skip this transfomration if no SA is found */
317 /* Bit mask of algos allowed for acquisition */
323 #define XFRM_MAX_DEPTH 6
327 struct xfrm_policy *next;
328 struct list_head list;
330 /* This lock only affects elements except for entry. */
333 struct timer_list timer;
337 struct xfrm_selector selector;
338 struct xfrm_lifetime_cfg lft;
339 struct xfrm_lifetime_cur curlft;
340 struct dst_entry *bundles;
346 struct xfrm_sec_ctx *security;
347 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
350 #define XFRM_KM_TIMEOUT 30
352 #define XFRM_REPLAY_SEQ 1
353 #define XFRM_REPLAY_OSEQ 2
354 #define XFRM_REPLAY_SEQ_MASK 3
356 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
357 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
359 /* default aevent timeout in units of 100ms */
360 #define XFRM_AE_ETIME 10
361 /* Async Event timer multiplier */
362 #define XFRM_AE_ETH_M 10
363 /* default seq threshold size */
364 #define XFRM_AE_SEQT_SIZE 2
368 struct list_head list;
370 int (*notify)(struct xfrm_state *x, struct km_event *c);
371 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
372 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
373 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
374 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
377 extern int xfrm_register_km(struct xfrm_mgr *km);
378 extern int xfrm_unregister_km(struct xfrm_mgr *km);
381 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
383 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
385 if (likely(policy != NULL))
386 atomic_inc(&policy->refcnt);
389 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
391 static inline void xfrm_pol_put(struct xfrm_policy *policy)
393 if (atomic_dec_and_test(&policy->refcnt))
394 __xfrm_policy_destroy(policy);
397 #define XFRM_DST_HSIZE 1024
400 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
404 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
409 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
412 h = ntohl(addr->a6[2]^addr->a6[3]);
413 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
418 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
422 return __xfrm4_dst_hash(addr);
424 return __xfrm6_dst_hash(addr);
430 unsigned __xfrm4_src_hash(xfrm_address_t *addr)
432 return __xfrm4_dst_hash(addr);
436 unsigned __xfrm6_src_hash(xfrm_address_t *addr)
438 return __xfrm6_dst_hash(addr);
442 unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
446 return __xfrm4_src_hash(addr);
448 return __xfrm6_src_hash(addr);
454 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
457 h = ntohl(addr->a4^spi^proto);
458 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
463 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
466 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
467 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
472 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
476 return __xfrm4_spi_hash(addr, spi, proto);
478 return __xfrm6_spi_hash(addr, spi, proto);
483 extern void __xfrm_state_destroy(struct xfrm_state *);
485 static inline void __xfrm_state_put(struct xfrm_state *x)
487 atomic_dec(&x->refcnt);
490 static inline void xfrm_state_put(struct xfrm_state *x)
492 if (atomic_dec_and_test(&x->refcnt))
493 __xfrm_state_destroy(x);
496 static inline void xfrm_state_hold(struct xfrm_state *x)
498 atomic_inc(&x->refcnt);
501 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
508 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
509 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
512 if (memcmp(a1, a2, pdw << 2))
518 mask = htonl((0xffffffff) << (32 - pbi));
520 if ((a1[pdw] ^ a2[pdw]) & mask)
528 u16 xfrm_flowi_sport(struct flowi *fl)
535 port = fl->fl_ip_sport;
539 port = htons(fl->fl_icmp_type);
548 u16 xfrm_flowi_dport(struct flowi *fl)
555 port = fl->fl_ip_dport;
559 port = htons(fl->fl_icmp_code);
568 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
570 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
571 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
572 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
573 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
574 (fl->proto == sel->proto || !sel->proto) &&
575 (fl->oif == sel->ifindex || !sel->ifindex);
579 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
581 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
582 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
583 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
584 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
585 (fl->proto == sel->proto || !sel->proto) &&
586 (fl->oif == sel->ifindex || !sel->ifindex);
590 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
591 unsigned short family)
595 return __xfrm4_selector_match(sel, fl);
597 return __xfrm6_selector_match(sel, fl);
602 #ifdef CONFIG_SECURITY_NETWORK_XFRM
603 /* If neither has a context --> match
604 * Otherwise, both must have a context and the sids, doi, alg must match
606 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
608 return ((!s1 && !s2) ||
610 (s1->ctx_sid == s2->ctx_sid) &&
611 (s1->ctx_doi == s2->ctx_doi) &&
612 (s1->ctx_alg == s2->ctx_alg)));
615 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
621 /* A struct encoding bundle of transformations to apply to some set of flow.
623 * dst->child points to the next element of bundle.
624 * dst->xfrm points to an instanse of transformer.
626 * Due to unfortunate limitations of current routing cache, which we
627 * have no time to fix, it mirrors struct rtable and bound to the same
628 * routing key, including saddr,daddr. However, we can have many of
629 * bundles differing by session id. All the bundles grow from a parent
635 struct xfrm_dst *next;
636 struct dst_entry dst;
640 struct dst_entry *route;
641 u32 route_mtu_cached;
642 u32 child_mtu_cached;
647 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
649 dst_release(xdst->route);
650 if (likely(xdst->u.dst.xfrm))
651 xfrm_state_put(xdst->u.dst.xfrm);
654 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
660 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
663 static inline struct sec_path *
664 secpath_get(struct sec_path *sp)
667 atomic_inc(&sp->refcnt);
671 extern void __secpath_destroy(struct sec_path *sp);
674 secpath_put(struct sec_path *sp)
676 if (sp && atomic_dec_and_test(&sp->refcnt))
677 __secpath_destroy(sp);
680 extern struct sec_path *secpath_dup(struct sec_path *src);
683 secpath_reset(struct sk_buff *skb)
686 secpath_put(skb->sp);
692 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
694 return (tmpl->saddr.a4 &&
695 tmpl->saddr.a4 != x->props.saddr.a4);
699 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
701 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
702 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
706 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
710 return __xfrm4_state_addr_cmp(tmpl, x);
712 return __xfrm6_state_addr_cmp(tmpl, x);
719 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
721 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
723 if (sk && sk->sk_policy[XFRM_POLICY_IN])
724 return __xfrm_policy_check(sk, dir, skb, family);
726 return (!xfrm_policy_list[dir] && !skb->sp) ||
727 (skb->dst->flags & DST_NOPOLICY) ||
728 __xfrm_policy_check(sk, dir, skb, family);
731 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
733 return xfrm_policy_check(sk, dir, skb, AF_INET);
736 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
738 return xfrm_policy_check(sk, dir, skb, AF_INET6);
741 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
742 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
744 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
746 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
747 (skb->dst->flags & DST_NOXFRM) ||
748 __xfrm_route_forward(skb, family);
751 static inline int xfrm4_route_forward(struct sk_buff *skb)
753 return xfrm_route_forward(skb, AF_INET);
756 static inline int xfrm6_route_forward(struct sk_buff *skb)
758 return xfrm_route_forward(skb, AF_INET6);
761 extern int __xfrm_sk_clone_policy(struct sock *sk);
763 static inline int xfrm_sk_clone_policy(struct sock *sk)
765 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
766 return __xfrm_sk_clone_policy(sk);
770 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
772 static inline void xfrm_sk_free_policy(struct sock *sk)
774 if (unlikely(sk->sk_policy[0] != NULL)) {
775 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
776 sk->sk_policy[0] = NULL;
778 if (unlikely(sk->sk_policy[1] != NULL)) {
779 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
780 sk->sk_policy[1] = NULL;
786 static inline void xfrm_sk_free_policy(struct sock *sk) {}
787 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
788 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
789 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
790 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
794 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
798 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
805 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
809 return (xfrm_address_t *)&fl->fl4_dst;
811 return (xfrm_address_t *)&fl->fl6_dst;
817 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
821 return (xfrm_address_t *)&fl->fl4_src;
823 return (xfrm_address_t *)&fl->fl6_src;
828 static __inline__ int
829 __xfrm4_state_addr_check(struct xfrm_state *x,
830 xfrm_address_t *daddr, xfrm_address_t *saddr)
832 if (daddr->a4 == x->id.daddr.a4 &&
833 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
838 static __inline__ int
839 __xfrm6_state_addr_check(struct xfrm_state *x,
840 xfrm_address_t *daddr, xfrm_address_t *saddr)
842 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
843 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
844 ipv6_addr_any((struct in6_addr *)saddr) ||
845 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
850 static __inline__ int
851 xfrm_state_addr_check(struct xfrm_state *x,
852 xfrm_address_t *daddr, xfrm_address_t *saddr,
853 unsigned short family)
857 return __xfrm4_state_addr_check(x, daddr, saddr);
859 return __xfrm6_state_addr_check(x, daddr, saddr);
864 static inline int xfrm_state_kern(struct xfrm_state *x)
866 return atomic_read(&x->tunnel_users);
869 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
871 return (!userproto || proto == userproto ||
872 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
873 proto == IPPROTO_ESP ||
874 proto == IPPROTO_COMP)));
878 * xfrm algorithm information
880 struct xfrm_algo_auth_info {
885 struct xfrm_algo_encr_info {
890 struct xfrm_algo_comp_info {
894 struct xfrm_algo_desc {
899 struct xfrm_algo_auth_info auth;
900 struct xfrm_algo_encr_info encr;
901 struct xfrm_algo_comp_info comp;
903 struct sadb_alg desc;
906 /* XFRM tunnel handlers. */
908 int (*handler)(struct sk_buff *skb);
909 int (*err_handler)(struct sk_buff *skb, __u32 info);
911 struct xfrm_tunnel *next;
915 struct xfrm6_tunnel {
916 int (*handler)(struct sk_buff *skb);
917 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
918 int type, int code, int offset, __u32 info);
920 struct xfrm6_tunnel *next;
924 extern void xfrm_init(void);
925 extern void xfrm4_init(void);
926 extern void xfrm6_init(void);
927 extern void xfrm6_fini(void);
928 extern void xfrm_state_init(void);
929 extern void xfrm4_state_init(void);
930 extern void xfrm6_state_init(void);
931 extern void xfrm6_state_fini(void);
933 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
934 extern struct xfrm_state *xfrm_state_alloc(void);
935 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
936 struct flowi *fl, struct xfrm_tmpl *tmpl,
937 struct xfrm_policy *pol, int *err,
938 unsigned short family);
939 extern int xfrm_state_check_expire(struct xfrm_state *x);
940 extern void xfrm_state_insert(struct xfrm_state *x);
941 extern int xfrm_state_add(struct xfrm_state *x);
942 extern int xfrm_state_update(struct xfrm_state *x);
943 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
944 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
945 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
946 extern int xfrm_state_delete(struct xfrm_state *x);
947 extern void xfrm_state_flush(u8 proto);
948 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
949 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
950 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
951 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
952 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
953 extern int xfrm_init_state(struct xfrm_state *x);
954 extern int xfrm4_rcv(struct sk_buff *skb);
955 extern int xfrm4_output(struct sk_buff *skb);
956 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
957 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
958 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
959 extern int xfrm6_rcv(struct sk_buff **pskb);
960 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
961 xfrm_address_t *saddr, u8 proto);
962 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
963 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
964 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
965 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
966 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
967 extern int xfrm6_output(struct sk_buff *skb);
968 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
972 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
973 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
974 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
976 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
981 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
983 /* should not happen */
987 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
993 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
994 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
995 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
996 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
997 struct xfrm_sec_ctx *ctx, int delete);
998 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
999 void xfrm_policy_flush(void);
1000 u32 xfrm_get_acqseq(void);
1001 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1002 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1003 xfrm_address_t *daddr, xfrm_address_t *saddr,
1004 int create, unsigned short family);
1005 extern void xfrm_policy_flush(void);
1006 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1007 extern int xfrm_flush_bundles(void);
1008 extern void xfrm_flush_all_bundles(void);
1009 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
1010 extern void xfrm_init_pmtu(struct dst_entry *dst);
1012 extern wait_queue_head_t km_waitq;
1013 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
1014 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1016 extern void xfrm_input_init(void);
1017 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
1019 extern void xfrm_probe_algs(void);
1020 extern int xfrm_count_auth_supported(void);
1021 extern int xfrm_count_enc_supported(void);
1022 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1023 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1024 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1025 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1026 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1027 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1028 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1029 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1033 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1036 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1037 int offset, int len, icv_update_fn_t icv_update);
1039 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1045 return a->a4 - b->a4;
1047 return ipv6_addr_cmp((struct in6_addr *)a,
1048 (struct in6_addr *)b);
1052 static inline int xfrm_policy_id2dir(u32 index)
1057 static inline int xfrm_aevent_is_on(void)
1063 nlsk = rcu_dereference(xfrm_nl);
1065 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1070 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1072 if (xfrm_aevent_is_on())
1073 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1077 #endif /* _NET_XFRM_H */