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[XFRM]: IPsec tunnel wildcard address support

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When the source address of a tunnel is given as 0.0.0.0 do a routing lookup
to get the real source address for the destination and fill that into the
acquire message. This allows to specify policies like this:

spdadd 172.16.128.13/32 172.16.0.0/20 any -P out ipsec
        esp/tunnel/0.0.0.0-x.x.x.x/require;
spdadd 172.16.0.0/20 172.16.128.13/32 any -P in ipsec
        esp/tunnel/x.x.x.x-0.0.0.0/require;

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2006-01-13 14:34:36 -08:00
committed by David S. Miller
parent 7b11f69fb5
commit ee51b1b6ce
2 changed files with 32 additions and 0 deletions
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net/ipv4/xfrm4_state.c
+15
View File
@@ -42,6 +42,21 @@ __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
x->props.saddr = tmpl->saddr;
if (x->props.saddr.a4 == 0)
x->props.saddr.a4 = saddr->a4;
if (tmpl->mode && x->props.saddr.a4 == 0) {
struct rtable *rt;
struct flowi fl_tunnel = {
.nl_u = {
.ip4_u = {
.daddr = x->id.daddr.a4,
}
}
};
if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
&fl_tunnel, AF_INET)) {
x->props.saddr.a4 = rt->rt_src;
dst_release(&rt->u.dst);
}
}
x->props.mode = tmpl->mode;
x->props.reqid = tmpl->reqid;
x->props.family = AF_INET;