4 #include <linux/xfrm.h>
5 #include <linux/spinlock.h>
6 #include <linux/list.h>
7 #include <linux/skbuff.h>
8 #include <linux/netdevice.h>
9 #include <linux/crypto.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/in6.h>
15 #include <net/route.h>
17 #include <net/ip6_fib.h>
19 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
21 extern struct semaphore xfrm_cfg_sem;
23 /* Organization of SPD aka "XFRM rules"
24 ------------------------------------
27 - policy rule, struct xfrm_policy (=SPD entry)
28 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
29 - instance of a transformer, struct xfrm_state (=SA)
30 - template to clone xfrm_state, struct xfrm_tmpl
32 SPD is plain linear list of xfrm_policy rules, ordered by priority.
33 (To be compatible with existing pfkeyv2 implementations,
34 many rules with priority of 0x7fffffff are allowed to exist and
35 such rules are ordered in an unpredictable way, thanks to bsd folks.)
37 Lookup is plain linear search until the first match with selector.
39 If "action" is "block", then we prohibit the flow, otherwise:
40 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
41 policy entry has list of up to XFRM_MAX_DEPTH transformations,
42 described by templates xfrm_tmpl. Each template is resolved
43 to a complete xfrm_state (see below) and we pack bundle of transformations
44 to a dst_entry returned to requestor.
46 dst -. xfrm .-> xfrm_state #1
47 |---. child .-> dst -. xfrm .-> xfrm_state #2
48 |---. child .-> dst -. xfrm .-> xfrm_state #3
51 Bundles are cached at xrfm_policy struct (field ->bundles).
54 Resolution of xrfm_tmpl
55 -----------------------
57 1. ->mode Mode: transport or tunnel
58 2. ->id.proto Protocol: AH/ESP/IPCOMP
59 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
60 Q: allow to resolve security gateway?
61 4. ->id.spi If not zero, static SPI.
62 5. ->saddr Local tunnel endpoint, ignored for transport mode.
63 6. ->algos List of allowed algos. Plain bitmask now.
64 Q: ealgos, aalgos, calgos. What a mess...
65 7. ->share Sharing mode.
66 Q: how to implement private sharing mode? To add struct sock* to
69 Having this template we search through SAD searching for entries
70 with appropriate mode/proto/algo, permitted by selector.
71 If no appropriate entry found, it is requested from key manager.
74 Q: How to find all the bundles referring to a physical path for
75 PMTU discovery? Seems, dst should contain list of all parents...
76 and enter to infinite locking hierarchy disaster.
77 No! It is easier, we will not search for them, let them find us.
78 We add genid to each dst plus pointer to genid of raw IP route,
79 pmtu disc will update pmtu on raw IP route and increase its genid.
80 dst_check() will see this for top level and trigger resyncing
81 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
84 /* Full description of state of transformer. */
87 /* Note: bydst is re-used during gc */
88 struct list_head bydst;
89 struct list_head byspi;
95 struct xfrm_selector sel;
104 /* Parameters of this state. */
109 u8 aalgo, ealgo, calgo;
112 xfrm_address_t saddr;
117 struct xfrm_lifetime_cfg lft;
119 /* Data for transformer */
120 struct xfrm_algo *aalg;
121 struct xfrm_algo *ealg;
122 struct xfrm_algo *calg;
124 /* Data for encapsulator */
125 struct xfrm_encap_tmpl *encap;
127 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
128 struct xfrm_state *tunnel;
130 /* If a tunnel, number of users + 1 */
131 atomic_t tunnel_users;
133 /* State for replay detection */
134 struct xfrm_replay_state replay;
137 struct xfrm_stats stats;
139 struct xfrm_lifetime_cur curlft;
140 struct timer_list timer;
142 /* Reference to data common to all the instances of this
144 struct xfrm_type *type;
146 /* Private data of this transformer, format is opaque,
147 * interpreted by xfrm_type methods. */
162 struct xfrm_policy_afinfo {
163 unsigned short family;
165 struct xfrm_type_map *type_map;
166 struct dst_ops *dst_ops;
167 void (*garbage_collect)(void);
168 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
169 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
170 int (*bundle_create)(struct xfrm_policy *policy,
171 struct xfrm_state **xfrm,
174 struct dst_entry **dst_p);
175 void (*decode_session)(struct sk_buff *skb,
179 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
180 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
181 extern struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
182 extern void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
184 #define XFRM_ACQ_EXPIRES 30
187 struct xfrm_state_afinfo {
188 unsigned short family;
190 struct list_head *state_bydst;
191 struct list_head *state_byspi;
192 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
193 struct xfrm_tmpl *tmpl,
194 xfrm_address_t *daddr, xfrm_address_t *saddr);
195 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
196 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
197 xfrm_address_t *daddr, xfrm_address_t *saddr,
201 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
202 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
203 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
204 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
206 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
208 struct xfrm_decap_state;
212 struct module *owner;
215 int (*init_state)(struct xfrm_state *x, void *args);
216 void (*destructor)(struct xfrm_state *);
217 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
218 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
219 int (*output)(struct sk_buff *pskb);
220 /* Estimate maximal size of result of transformation of a dgram */
221 u32 (*get_max_size)(struct xfrm_state *, int size);
224 struct xfrm_type_map {
226 struct xfrm_type *map[256];
229 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
230 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
231 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
232 extern void xfrm_put_type(struct xfrm_type *type);
236 /* id in template is interpreted as:
237 * daddr - destination of tunnel, may be zero for transport mode.
238 * spi - zero to acquire spi. Not zero if spi is static, then
239 * daddr must be fixed too.
240 * proto - AH/ESP/IPCOMP
244 /* Source address of tunnel. Ignored, if it is not a tunnel. */
245 xfrm_address_t saddr;
249 /* Mode: transport/tunnel */
252 /* Sharing mode: unique, this session only, this user only etc. */
255 /* May skip this transfomration if no SA is found */
258 /* Bit mask of algos allowed for acquisition */
264 #define XFRM_MAX_DEPTH 4
268 struct xfrm_policy *next;
269 struct list_head list;
271 /* This lock only affects elements except for entry. */
274 struct timer_list timer;
278 struct xfrm_selector selector;
279 struct xfrm_lifetime_cfg lft;
280 struct xfrm_lifetime_cur curlft;
281 struct dst_entry *bundles;
287 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
290 #define XFRM_KM_TIMEOUT 30
294 struct list_head list;
296 int (*notify)(struct xfrm_state *x, int event);
297 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
298 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
299 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
300 int (*notify_policy)(struct xfrm_policy *x, int dir, int event);
303 extern int xfrm_register_km(struct xfrm_mgr *km);
304 extern int xfrm_unregister_km(struct xfrm_mgr *km);
307 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
309 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
311 if (likely(policy != NULL))
312 atomic_inc(&policy->refcnt);
315 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
317 static inline void xfrm_pol_put(struct xfrm_policy *policy)
319 if (atomic_dec_and_test(&policy->refcnt))
320 __xfrm_policy_destroy(policy);
323 #define XFRM_DST_HSIZE 1024
326 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
330 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
335 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
338 h = ntohl(addr->a6[2]^addr->a6[3]);
339 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
344 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
348 return __xfrm4_dst_hash(addr);
350 return __xfrm6_dst_hash(addr);
356 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
359 h = ntohl(addr->a4^spi^proto);
360 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
365 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
368 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
369 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
374 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
378 return __xfrm4_spi_hash(addr, spi, proto);
380 return __xfrm6_spi_hash(addr, spi, proto);
385 extern void __xfrm_state_destroy(struct xfrm_state *);
387 static inline void xfrm_state_put(struct xfrm_state *x)
389 if (atomic_dec_and_test(&x->refcnt))
390 __xfrm_state_destroy(x);
393 static inline void xfrm_state_hold(struct xfrm_state *x)
395 atomic_inc(&x->refcnt);
398 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
405 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
406 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
409 if (memcmp(a1, a2, pdw << 2))
415 mask = htonl((0xffffffff) << (32 - pbi));
417 if ((a1[pdw] ^ a2[pdw]) & mask)
425 u16 xfrm_flowi_sport(struct flowi *fl)
431 port = fl->fl_ip_sport;
435 port = htons(fl->fl_icmp_type);
444 u16 xfrm_flowi_dport(struct flowi *fl)
450 port = fl->fl_ip_dport;
454 port = htons(fl->fl_icmp_code);
463 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
465 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
466 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
467 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
468 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
469 (fl->proto == sel->proto || !sel->proto) &&
470 (fl->oif == sel->ifindex || !sel->ifindex);
474 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
476 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
477 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
478 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
479 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
480 (fl->proto == sel->proto || !sel->proto) &&
481 (fl->oif == sel->ifindex || !sel->ifindex);
485 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
486 unsigned short family)
490 return __xfrm4_selector_match(sel, fl);
492 return __xfrm6_selector_match(sel, fl);
497 /* A struct encoding bundle of transformations to apply to some set of flow.
499 * dst->child points to the next element of bundle.
500 * dst->xfrm points to an instanse of transformer.
502 * Due to unfortunate limitations of current routing cache, which we
503 * have no time to fix, it mirrors struct rtable and bound to the same
504 * routing key, including saddr,daddr. However, we can have many of
505 * bundles differing by session id. All the bundles grow from a parent
511 struct xfrm_dst *next;
512 struct dst_entry dst;
518 /* Decapsulation state, used by the input to store data during
519 * decapsulation procedure, to be used later (during the policy
522 struct xfrm_decap_state {
527 struct sec_decap_state {
528 struct xfrm_state *xvec;
529 struct xfrm_decap_state decap;
536 #ifdef CONFIG_NETFILTER
539 struct sec_decap_state x[XFRM_MAX_DEPTH];
542 static inline struct sec_path *
543 secpath_get(struct sec_path *sp)
546 atomic_inc(&sp->refcnt);
550 extern void __secpath_destroy(struct sec_path *sp);
553 secpath_put(struct sec_path *sp)
555 if (sp && atomic_dec_and_test(&sp->refcnt))
556 __secpath_destroy(sp);
559 extern struct sec_path *secpath_dup(struct sec_path *src);
562 secpath_reset(struct sk_buff *skb)
565 secpath_put(skb->sp);
571 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
573 return (tmpl->saddr.a4 &&
574 tmpl->saddr.a4 != x->props.saddr.a4);
578 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
580 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
581 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
585 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
589 return __xfrm4_state_addr_cmp(tmpl, x);
591 return __xfrm6_state_addr_cmp(tmpl, x);
598 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
600 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
602 if (sk && sk->sk_policy[XFRM_POLICY_IN])
603 return __xfrm_policy_check(sk, dir, skb, family);
605 return !xfrm_policy_list[dir] ||
606 (skb->dst->flags & DST_NOPOLICY) ||
607 __xfrm_policy_check(sk, dir, skb, family);
610 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
612 return xfrm_policy_check(sk, dir, skb, AF_INET);
615 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
617 return xfrm_policy_check(sk, dir, skb, AF_INET6);
621 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
623 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
625 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
626 (skb->dst->flags & DST_NOXFRM) ||
627 __xfrm_route_forward(skb, family);
630 static inline int xfrm4_route_forward(struct sk_buff *skb)
632 return xfrm_route_forward(skb, AF_INET);
635 static inline int xfrm6_route_forward(struct sk_buff *skb)
637 return xfrm_route_forward(skb, AF_INET6);
640 extern int __xfrm_sk_clone_policy(struct sock *sk);
642 static inline int xfrm_sk_clone_policy(struct sock *sk)
644 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
645 return __xfrm_sk_clone_policy(sk);
649 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
651 static inline void xfrm_sk_free_policy(struct sock *sk)
653 if (unlikely(sk->sk_policy[0] != NULL)) {
654 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
655 sk->sk_policy[0] = NULL;
657 if (unlikely(sk->sk_policy[1] != NULL)) {
658 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
659 sk->sk_policy[1] = NULL;
665 static inline void xfrm_sk_free_policy(struct sock *sk) {}
666 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
667 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
668 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
669 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
673 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
677 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
684 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
688 return (xfrm_address_t *)&fl->fl4_dst;
690 return (xfrm_address_t *)&fl->fl6_dst;
696 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
700 return (xfrm_address_t *)&fl->fl4_src;
702 return (xfrm_address_t *)&fl->fl6_src;
707 static __inline__ int
708 __xfrm4_state_addr_check(struct xfrm_state *x,
709 xfrm_address_t *daddr, xfrm_address_t *saddr)
711 if (daddr->a4 == x->id.daddr.a4 &&
712 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
717 static __inline__ int
718 __xfrm6_state_addr_check(struct xfrm_state *x,
719 xfrm_address_t *daddr, xfrm_address_t *saddr)
721 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
722 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
723 ipv6_addr_any((struct in6_addr *)saddr) ||
724 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
729 static __inline__ int
730 xfrm_state_addr_check(struct xfrm_state *x,
731 xfrm_address_t *daddr, xfrm_address_t *saddr,
732 unsigned short family)
736 return __xfrm4_state_addr_check(x, daddr, saddr);
738 return __xfrm6_state_addr_check(x, daddr, saddr);
743 static inline int xfrm_state_kern(struct xfrm_state *x)
745 return atomic_read(&x->tunnel_users);
749 * xfrm algorithm information
751 struct xfrm_algo_auth_info {
756 struct xfrm_algo_encr_info {
761 struct xfrm_algo_comp_info {
765 struct xfrm_algo_desc {
769 struct xfrm_algo_auth_info auth;
770 struct xfrm_algo_encr_info encr;
771 struct xfrm_algo_comp_info comp;
773 struct sadb_alg desc;
776 /* XFRM tunnel handlers. */
778 int (*handler)(struct sk_buff *skb);
779 void (*err_handler)(struct sk_buff *skb, void *info);
782 struct xfrm6_tunnel {
783 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
784 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
785 int type, int code, int offset, __u32 info);
788 extern void xfrm_init(void);
789 extern void xfrm4_init(void);
790 extern void xfrm4_fini(void);
791 extern void xfrm6_init(void);
792 extern void xfrm6_fini(void);
793 extern void xfrm_state_init(void);
794 extern void xfrm4_state_init(void);
795 extern void xfrm4_state_fini(void);
796 extern void xfrm6_state_init(void);
797 extern void xfrm6_state_fini(void);
799 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
800 extern struct xfrm_state *xfrm_state_alloc(void);
801 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
802 struct flowi *fl, struct xfrm_tmpl *tmpl,
803 struct xfrm_policy *pol, int *err,
804 unsigned short family);
805 extern int xfrm_state_check_expire(struct xfrm_state *x);
806 extern void xfrm_state_insert(struct xfrm_state *x);
807 extern int xfrm_state_add(struct xfrm_state *x);
808 extern int xfrm_state_update(struct xfrm_state *x);
809 extern int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb);
810 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
811 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
812 extern void xfrm_state_delete(struct xfrm_state *x);
813 extern void xfrm_state_flush(u8 proto);
814 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
815 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
816 extern int xfrm_check_selectors(struct xfrm_state **x, int n, struct flowi *fl);
817 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
818 extern int xfrm4_rcv(struct sk_buff *skb);
819 extern int xfrm4_output(struct sk_buff **pskb);
820 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
821 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
822 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
823 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
824 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
825 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
826 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
827 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
828 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
829 extern int xfrm6_output(struct sk_buff **pskb);
832 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
833 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
834 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
836 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
841 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
843 /* should not happen */
847 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
853 void xfrm_policy_init(void);
854 struct xfrm_policy *xfrm_policy_alloc(int gfp);
855 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
856 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
857 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
859 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
860 void xfrm_policy_flush(void);
861 u32 xfrm_get_acqseq(void);
862 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
863 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
864 xfrm_address_t *daddr, xfrm_address_t *saddr,
865 int create, unsigned short family);
866 extern void xfrm_policy_flush(void);
867 extern void xfrm_policy_kill(struct xfrm_policy *);
868 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
869 extern struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl);
870 extern int xfrm_flush_bundles(void);
872 extern wait_queue_head_t km_waitq;
873 extern void km_state_expired(struct xfrm_state *x, int hard);
874 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *pol);
875 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
876 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
878 extern void xfrm_input_init(void);
879 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
881 extern void xfrm_probe_algs(void);
882 extern int xfrm_count_auth_supported(void);
883 extern int xfrm_count_enc_supported(void);
884 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
885 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
886 extern struct xfrm_algo_desc *xfrm_calg_get_byidx(unsigned int idx);
887 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
888 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
889 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
890 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name);
891 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name);
892 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name);
895 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
897 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
898 int offset, int len, icv_update_fn_t icv_update);
900 #endif /* _NET_XFRM_H */