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[XFRM] STATE: Add a hook to obtain local/remote outbound address. 

Outbound transformation replaces both source and destination address with
state's end-point addresses at the same time when IPsec tunnel mode.
It is also required to change them for Mobile IPv6 route optimization, but we
should care about the following differences:
 - changing result is not end-point but care-of address
 - either source or destination is replaced for each state
This hook is a common platform to change outbound address.
Based on MIPL2 kernel patch.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Masahide NAKAMURA 2006-08-23 18:10:33 -07:00 committed by David S. Miller
parent 9e51fd371a
commit 99505a8436
2 changed files with 20 additions and 2 deletions
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2
include/net/xfrm.h
View File

@ -266,6 +266,8 @@ struct xfrm_type
int (*input)(struct xfrm_state *, struct sk_buff *skb);
int (*output)(struct xfrm_state *, struct sk_buff *pskb);
int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
/* Estimate maximal size of result of transformation of a dgram */
u32 (*get_max_size)(struct xfrm_state *, int size);
};

20
net/ipv6/xfrm6_policy.c
View File

@ -59,6 +59,22 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
return dst;
}
static inline struct in6_addr*
__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
{
return (x->type->remote_addr) ?
(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
(struct in6_addr*)&x->id.daddr;
}
static inline struct in6_addr*
__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
{
return (x->type->local_addr) ?
(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
(struct in6_addr*)&x->props.saddr;
}
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
* all the metrics... Shortly, bundle a bundle.
*/
@ -115,8 +131,8 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
dst1->next = dst_prev;
dst_prev = dst1;
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
remote = (struct in6_addr*)&xfrm[i]->id.daddr;
local = (struct in6_addr*)&xfrm[i]->props.saddr;
remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
local = __xfrm6_bundle_addr_local(xfrm[i], local);
tunnel = 1;
}
header_len += xfrm[i]->props.header_len;