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authorMasahide NAKAMURA <nakam@linux-ipv6.org>2006-08-23 18:11:50 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 15:06:41 -0700
commit1b5c229987dc4d0c92a38fac0cde2aeec08cd775 (patch)
tree5726243af6aa7194f1ed65e0340539e1ee5c6a42 /net/ipv6/xfrm6_policy.c
parent99505a843673faeae962a8cde128c7c034ba6b5e (diff)
[XFRM] STATE: Support non-fragment outbound transformation headers.
For originated outbound IPv6 packets which will fragment, ip6_append_data() should know length of extension headers before sending them and the length is carried by dst_entry. IPv6 IPsec headers fragment then transformation was designed to place all headers after fragment header. OTOH Mobile IPv6 extension headers do not fragment then it is a good idea to make dst_entry have non-fragment length to tell it to ip6_append_data(). 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>
Diffstat (limited to 'net/ipv6/xfrm6_policy.c')
-rw-r--r--net/ipv6/xfrm6_policy.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 9328fc88708..a3f68c8b737 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -75,6 +75,24 @@ __xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
(struct in6_addr*)&x->props.saddr;
}
+static inline void
+__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
+{
+ if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
+ *nflen += x->props.header_len;
+ else
+ *len += x->props.header_len;
+}
+
+static inline void
+__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
+{
+ if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
+ *nflen -= x->props.header_len;
+ else
+ *len -= x->props.header_len;
+}
+
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
* all the metrics... Shortly, bundle a bundle.
*/
@@ -99,6 +117,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
int i;
int err = 0;
int header_len = 0;
+ int nfheader_len = 0;
int trailer_len = 0;
dst = dst_prev = NULL;
@@ -135,7 +154,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
local = __xfrm6_bundle_addr_local(xfrm[i], local);
tunnel = 1;
}
- header_len += xfrm[i]->props.header_len;
+ __xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
trailer_len += xfrm[i]->props.trailer_len;
if (tunnel) {
@@ -170,6 +189,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
dst_prev->flags |= DST_HOST;
dst_prev->lastuse = jiffies;
dst_prev->header_len = header_len;
+ dst_prev->nfheader_len = nfheader_len;
dst_prev->trailer_len = trailer_len;
memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
@@ -188,7 +208,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
x->u.rt6.rt6i_src = rt0->rt6i_src;
x->u.rt6.rt6i_idev = rt0->rt6i_idev;
in6_dev_hold(rt0->rt6i_idev);
- header_len -= x->u.dst.xfrm->props.header_len;
+ __xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
trailer_len -= x->u.dst.xfrm->props.trailer_len;
}