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/netdevice.h>
10 #include <linux/crypto.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/in6.h>
16 #include <net/route.h>
18 #include <net/ip6_fib.h>
20 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
22 extern struct semaphore xfrm_cfg_sem;
24 /* Organization of SPD aka "XFRM rules"
25 ------------------------------------
28 - policy rule, struct xfrm_policy (=SPD entry)
29 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
30 - instance of a transformer, struct xfrm_state (=SA)
31 - template to clone xfrm_state, struct xfrm_tmpl
33 SPD is plain linear list of xfrm_policy rules, ordered by priority.
34 (To be compatible with existing pfkeyv2 implementations,
35 many rules with priority of 0x7fffffff are allowed to exist and
36 such rules are ordered in an unpredictable way, thanks to bsd folks.)
38 Lookup is plain linear search until the first match with selector.
40 If "action" is "block", then we prohibit the flow, otherwise:
41 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
42 policy entry has list of up to XFRM_MAX_DEPTH transformations,
43 described by templates xfrm_tmpl. Each template is resolved
44 to a complete xfrm_state (see below) and we pack bundle of transformations
45 to a dst_entry returned to requestor.
47 dst -. xfrm .-> xfrm_state #1
48 |---. child .-> dst -. xfrm .-> xfrm_state #2
49 |---. child .-> dst -. xfrm .-> xfrm_state #3
52 Bundles are cached at xrfm_policy struct (field ->bundles).
55 Resolution of xrfm_tmpl
56 -----------------------
58 1. ->mode Mode: transport or tunnel
59 2. ->id.proto Protocol: AH/ESP/IPCOMP
60 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
61 Q: allow to resolve security gateway?
62 4. ->id.spi If not zero, static SPI.
63 5. ->saddr Local tunnel endpoint, ignored for transport mode.
64 6. ->algos List of allowed algos. Plain bitmask now.
65 Q: ealgos, aalgos, calgos. What a mess...
66 7. ->share Sharing mode.
67 Q: how to implement private sharing mode? To add struct sock* to
70 Having this template we search through SAD searching for entries
71 with appropriate mode/proto/algo, permitted by selector.
72 If no appropriate entry found, it is requested from key manager.
75 Q: How to find all the bundles referring to a physical path for
76 PMTU discovery? Seems, dst should contain list of all parents...
77 and enter to infinite locking hierarchy disaster.
78 No! It is easier, we will not search for them, let them find us.
79 We add genid to each dst plus pointer to genid of raw IP route,
80 pmtu disc will update pmtu on raw IP route and increase its genid.
81 dst_check() will see this for top level and trigger resyncing
82 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
85 /* Full description of state of transformer. */
88 /* Note: bydst is re-used during gc */
89 struct list_head bydst;
90 struct list_head byspi;
96 struct xfrm_selector sel;
105 /* Parameters of this state. */
110 u8 aalgo, ealgo, calgo;
113 xfrm_address_t saddr;
118 struct xfrm_lifetime_cfg lft;
120 /* Data for transformer */
121 struct xfrm_algo *aalg;
122 struct xfrm_algo *ealg;
123 struct xfrm_algo *calg;
125 /* Data for encapsulator */
126 struct xfrm_encap_tmpl *encap;
128 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
129 struct xfrm_state *tunnel;
131 /* If a tunnel, number of users + 1 */
132 atomic_t tunnel_users;
134 /* State for replay detection */
135 struct xfrm_replay_state replay;
138 struct xfrm_stats stats;
140 struct xfrm_lifetime_cur curlft;
141 struct timer_list timer;
143 /* Reference to data common to all the instances of this
145 struct xfrm_type *type;
147 /* Private data of this transformer, format is opaque,
148 * interpreted by xfrm_type methods. */
161 /* callback structure passed from either netlink or pfkey */
177 struct xfrm_policy_afinfo {
178 unsigned short family;
180 struct xfrm_type_map *type_map;
181 struct dst_ops *dst_ops;
182 void (*garbage_collect)(void);
183 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
184 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
185 int (*bundle_create)(struct xfrm_policy *policy,
186 struct xfrm_state **xfrm,
189 struct dst_entry **dst_p);
190 void (*decode_session)(struct sk_buff *skb,
194 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
195 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
196 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
197 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
199 #define XFRM_ACQ_EXPIRES 30
202 struct xfrm_state_afinfo {
203 unsigned short family;
205 struct list_head *state_bydst;
206 struct list_head *state_byspi;
207 int (*init_flags)(struct xfrm_state *x);
208 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
209 struct xfrm_tmpl *tmpl,
210 xfrm_address_t *daddr, xfrm_address_t *saddr);
211 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
212 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
213 xfrm_address_t *daddr, xfrm_address_t *saddr,
217 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
218 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
220 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
222 struct xfrm_decap_state;
226 struct module *owner;
229 int (*init_state)(struct xfrm_state *x);
230 void (*destructor)(struct xfrm_state *);
231 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
232 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
233 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
234 /* Estimate maximal size of result of transformation of a dgram */
235 u32 (*get_max_size)(struct xfrm_state *, int size);
238 struct xfrm_type_map {
240 struct xfrm_type *map[256];
243 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
244 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
245 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
246 extern void xfrm_put_type(struct xfrm_type *type);
250 /* id in template is interpreted as:
251 * daddr - destination of tunnel, may be zero for transport mode.
252 * spi - zero to acquire spi. Not zero if spi is static, then
253 * daddr must be fixed too.
254 * proto - AH/ESP/IPCOMP
258 /* Source address of tunnel. Ignored, if it is not a tunnel. */
259 xfrm_address_t saddr;
263 /* Mode: transport/tunnel */
266 /* Sharing mode: unique, this session only, this user only etc. */
269 /* May skip this transfomration if no SA is found */
272 /* Bit mask of algos allowed for acquisition */
278 #define XFRM_MAX_DEPTH 4
282 struct xfrm_policy *next;
283 struct list_head list;
285 /* This lock only affects elements except for entry. */
288 struct timer_list timer;
292 struct xfrm_selector selector;
293 struct xfrm_lifetime_cfg lft;
294 struct xfrm_lifetime_cur curlft;
295 struct dst_entry *bundles;
301 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
304 #define XFRM_KM_TIMEOUT 30
308 struct list_head list;
310 int (*notify)(struct xfrm_state *x, struct km_event *c);
311 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
312 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
313 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
314 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
317 extern int xfrm_register_km(struct xfrm_mgr *km);
318 extern int xfrm_unregister_km(struct xfrm_mgr *km);
321 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
323 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
325 if (likely(policy != NULL))
326 atomic_inc(&policy->refcnt);
329 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
331 static inline void xfrm_pol_put(struct xfrm_policy *policy)
333 if (atomic_dec_and_test(&policy->refcnt))
334 __xfrm_policy_destroy(policy);
337 #define XFRM_DST_HSIZE 1024
340 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
344 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
349 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
352 h = ntohl(addr->a6[2]^addr->a6[3]);
353 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
358 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
362 return __xfrm4_dst_hash(addr);
364 return __xfrm6_dst_hash(addr);
370 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
373 h = ntohl(addr->a4^spi^proto);
374 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
379 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
382 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
383 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
388 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
392 return __xfrm4_spi_hash(addr, spi, proto);
394 return __xfrm6_spi_hash(addr, spi, proto);
399 extern void __xfrm_state_destroy(struct xfrm_state *);
401 static inline void xfrm_state_put(struct xfrm_state *x)
403 if (atomic_dec_and_test(&x->refcnt))
404 __xfrm_state_destroy(x);
407 static inline void xfrm_state_hold(struct xfrm_state *x)
409 atomic_inc(&x->refcnt);
412 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
419 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
420 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
423 if (memcmp(a1, a2, pdw << 2))
429 mask = htonl((0xffffffff) << (32 - pbi));
431 if ((a1[pdw] ^ a2[pdw]) & mask)
439 u16 xfrm_flowi_sport(struct flowi *fl)
446 port = fl->fl_ip_sport;
450 port = htons(fl->fl_icmp_type);
459 u16 xfrm_flowi_dport(struct flowi *fl)
466 port = fl->fl_ip_dport;
470 port = htons(fl->fl_icmp_code);
479 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
481 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
482 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
483 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
484 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
485 (fl->proto == sel->proto || !sel->proto) &&
486 (fl->oif == sel->ifindex || !sel->ifindex);
490 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
492 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
493 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
494 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
495 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
496 (fl->proto == sel->proto || !sel->proto) &&
497 (fl->oif == sel->ifindex || !sel->ifindex);
501 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
502 unsigned short family)
506 return __xfrm4_selector_match(sel, fl);
508 return __xfrm6_selector_match(sel, fl);
513 /* A struct encoding bundle of transformations to apply to some set of flow.
515 * dst->child points to the next element of bundle.
516 * dst->xfrm points to an instanse of transformer.
518 * Due to unfortunate limitations of current routing cache, which we
519 * have no time to fix, it mirrors struct rtable and bound to the same
520 * routing key, including saddr,daddr. However, we can have many of
521 * bundles differing by session id. All the bundles grow from a parent
527 struct xfrm_dst *next;
528 struct dst_entry dst;
532 struct dst_entry *route;
533 u32 route_mtu_cached;
534 u32 child_mtu_cached;
539 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
541 dst_release(xdst->route);
542 if (likely(xdst->u.dst.xfrm))
543 xfrm_state_put(xdst->u.dst.xfrm);
546 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
548 /* Decapsulation state, used by the input to store data during
549 * decapsulation procedure, to be used later (during the policy
552 struct xfrm_decap_state {
557 struct sec_decap_state {
558 struct xfrm_state *xvec;
559 struct xfrm_decap_state decap;
566 struct sec_decap_state x[XFRM_MAX_DEPTH];
569 static inline struct sec_path *
570 secpath_get(struct sec_path *sp)
573 atomic_inc(&sp->refcnt);
577 extern void __secpath_destroy(struct sec_path *sp);
580 secpath_put(struct sec_path *sp)
582 if (sp && atomic_dec_and_test(&sp->refcnt))
583 __secpath_destroy(sp);
586 extern struct sec_path *secpath_dup(struct sec_path *src);
589 secpath_reset(struct sk_buff *skb)
592 secpath_put(skb->sp);
598 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
600 return (tmpl->saddr.a4 &&
601 tmpl->saddr.a4 != x->props.saddr.a4);
605 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
607 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
608 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
612 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
616 return __xfrm4_state_addr_cmp(tmpl, x);
618 return __xfrm6_state_addr_cmp(tmpl, x);
625 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
627 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
629 if (sk && sk->sk_policy[XFRM_POLICY_IN])
630 return __xfrm_policy_check(sk, dir, skb, family);
632 return (!xfrm_policy_list[dir] && !skb->sp) ||
633 (skb->dst->flags & DST_NOPOLICY) ||
634 __xfrm_policy_check(sk, dir, skb, family);
637 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
639 return xfrm_policy_check(sk, dir, skb, AF_INET);
642 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
644 return xfrm_policy_check(sk, dir, skb, AF_INET6);
648 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
650 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
652 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
653 (skb->dst->flags & DST_NOXFRM) ||
654 __xfrm_route_forward(skb, family);
657 static inline int xfrm4_route_forward(struct sk_buff *skb)
659 return xfrm_route_forward(skb, AF_INET);
662 static inline int xfrm6_route_forward(struct sk_buff *skb)
664 return xfrm_route_forward(skb, AF_INET6);
667 extern int __xfrm_sk_clone_policy(struct sock *sk);
669 static inline int xfrm_sk_clone_policy(struct sock *sk)
671 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
672 return __xfrm_sk_clone_policy(sk);
676 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
678 static inline void xfrm_sk_free_policy(struct sock *sk)
680 if (unlikely(sk->sk_policy[0] != NULL)) {
681 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
682 sk->sk_policy[0] = NULL;
684 if (unlikely(sk->sk_policy[1] != NULL)) {
685 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
686 sk->sk_policy[1] = NULL;
692 static inline void xfrm_sk_free_policy(struct sock *sk) {}
693 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
694 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
695 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
696 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
700 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
704 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
711 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
715 return (xfrm_address_t *)&fl->fl4_dst;
717 return (xfrm_address_t *)&fl->fl6_dst;
723 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
727 return (xfrm_address_t *)&fl->fl4_src;
729 return (xfrm_address_t *)&fl->fl6_src;
734 static __inline__ int
735 __xfrm4_state_addr_check(struct xfrm_state *x,
736 xfrm_address_t *daddr, xfrm_address_t *saddr)
738 if (daddr->a4 == x->id.daddr.a4 &&
739 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
744 static __inline__ int
745 __xfrm6_state_addr_check(struct xfrm_state *x,
746 xfrm_address_t *daddr, xfrm_address_t *saddr)
748 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
749 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
750 ipv6_addr_any((struct in6_addr *)saddr) ||
751 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
756 static __inline__ int
757 xfrm_state_addr_check(struct xfrm_state *x,
758 xfrm_address_t *daddr, xfrm_address_t *saddr,
759 unsigned short family)
763 return __xfrm4_state_addr_check(x, daddr, saddr);
765 return __xfrm6_state_addr_check(x, daddr, saddr);
770 static inline int xfrm_state_kern(struct xfrm_state *x)
772 return atomic_read(&x->tunnel_users);
776 * xfrm algorithm information
778 struct xfrm_algo_auth_info {
783 struct xfrm_algo_encr_info {
788 struct xfrm_algo_comp_info {
792 struct xfrm_algo_desc {
796 struct xfrm_algo_auth_info auth;
797 struct xfrm_algo_encr_info encr;
798 struct xfrm_algo_comp_info comp;
800 struct sadb_alg desc;
803 /* XFRM tunnel handlers. */
805 int (*handler)(struct sk_buff *skb);
806 void (*err_handler)(struct sk_buff *skb, __u32 info);
809 struct xfrm6_tunnel {
810 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
811 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
812 int type, int code, int offset, __u32 info);
815 extern void xfrm_init(void);
816 extern void xfrm4_init(void);
817 extern void xfrm6_init(void);
818 extern void xfrm6_fini(void);
819 extern void xfrm_state_init(void);
820 extern void xfrm4_state_init(void);
821 extern void xfrm4_state_fini(void);
822 extern void xfrm6_state_init(void);
823 extern void xfrm6_state_fini(void);
825 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
826 extern struct xfrm_state *xfrm_state_alloc(void);
827 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
828 struct flowi *fl, struct xfrm_tmpl *tmpl,
829 struct xfrm_policy *pol, int *err,
830 unsigned short family);
831 extern int xfrm_state_check_expire(struct xfrm_state *x);
832 extern void xfrm_state_insert(struct xfrm_state *x);
833 extern int xfrm_state_add(struct xfrm_state *x);
834 extern int xfrm_state_update(struct xfrm_state *x);
835 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
836 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
837 extern int xfrm_state_delete(struct xfrm_state *x);
838 extern void xfrm_state_flush(u8 proto);
839 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
840 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
841 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
842 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
843 extern int xfrm_init_state(struct xfrm_state *x);
844 extern int xfrm4_rcv(struct sk_buff *skb);
845 extern int xfrm4_output(struct sk_buff *skb);
846 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
847 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
848 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
849 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
850 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
851 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
852 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
853 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
854 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
855 extern int xfrm6_output(struct sk_buff *skb);
858 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
859 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
860 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
862 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
867 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
869 /* should not happen */
873 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
879 struct xfrm_policy *xfrm_policy_alloc(int gfp);
880 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
881 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
882 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
884 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
885 void xfrm_policy_flush(void);
886 u32 xfrm_get_acqseq(void);
887 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
888 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
889 xfrm_address_t *daddr, xfrm_address_t *saddr,
890 int create, unsigned short family);
891 extern void xfrm_policy_flush(void);
892 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
893 extern int xfrm_flush_bundles(void);
894 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
895 extern void xfrm_init_pmtu(struct dst_entry *dst);
897 extern wait_queue_head_t km_waitq;
898 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
899 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
901 extern void xfrm_input_init(void);
902 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
904 extern void xfrm_probe_algs(void);
905 extern int xfrm_count_auth_supported(void);
906 extern int xfrm_count_enc_supported(void);
907 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
908 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
909 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
910 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
911 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
912 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
913 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
914 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
917 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
919 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
920 int offset, int len, icv_update_fn_t icv_update);
922 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
928 return a->a4 - b->a4;
930 return ipv6_addr_cmp((struct in6_addr *)a,
931 (struct in6_addr *)b);
935 #endif /* _NET_XFRM_H */