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netfilter: af_info: add 'strict' parameter to limit lookup to .oif

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ipv6 fib lookup can set RT6_LOOKUP_F_IFACE flag to restrict search
to an interface, but this flag cannot be set via struct flowi.

Also, it cannot be set via ip6_route_output: this function uses the
passed sock struct to determine if this flag is required
(by testing for nonzero sk_bound_dev_if).

Work around this by passing in an artificial struct sk in case
'strict' argument is true.

This is required to replace the rt6_lookup call in xt_addrtype.c with
nf_afinfo->route().

Signed-off-by: Florian Westphal <[email protected]>
Acked-by: David S. Miller <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Florian Westphal 2011-04-04 17:00:54 +02:00 • committed by Patrick McHardy
commit 0fae2e7740
5 changed files with 17 additions and 9 deletions
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12
net/ipv6/netfilter.c
View file

@ -91,9 +91,17 @@ static int nf_ip6_reroute(struct sk_buff *skb,
}
static int nf_ip6_route(struct net *net, struct dst_entry **dst,
struct flowi *fl)
struct flowi *fl, bool strict)
{
*dst = ip6_route_output(net, NULL, &fl->u.ip6);
static const struct ipv6_pinfo fake_pinfo;
static const struct inet_sock fake_sk = {
/* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */
.sk.sk_bound_dev_if = 1,
.pinet6 = (struct ipv6_pinfo *) &fake_pinfo,
};
const void *sk = strict ? &fake_sk : NULL;
*dst = ip6_route_output(net, sk, &fl->u.ip6);
return (*dst)->error;
}