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[IPv6] rules: Use RT6_LOOKUP_F_HAS_SADDR and fix source based selectors

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Fixes rt6_lookup() to provide the source address in the flow
and sets RT6_LOOKUP_F_HAS_SADDR whenever it is present in
the flow.

Avoids unnecessary prefix comparisons by checking for a prefix
length first.

Fixes the rule logic to not match packets if a source selector
has been specified but no source address is available.

Thanks to Kim Nordlund <kim.nordlund@nokia.com> for working
on this patch with me.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-10-13 15:01:03 -07:00 committed by David S. Miller
parent 918049f013
commit adaa70bbdf
2 changed files with 23 additions and 7 deletions
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11
net/ipv6/fib6_rules.c
View File

@ -117,12 +117,15 @@ static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
struct fib6_rule *r = (struct fib6_rule *) rule;
if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
if (r->dst.plen &&
!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
return 0;
if ((flags & RT6_LOOKUP_F_HAS_SADDR) &&
!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
return 0;
if (r->src.plen) {
if (!(flags & RT6_LOOKUP_F_HAS_SADDR) ||
!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
return 0;
}
if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
return 0;

19
net/ipv6/route.c
View File

@ -529,13 +529,17 @@ struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
.nl_u = {
.ip6_u = {
.daddr = *daddr,
/* TODO: saddr */
},
},
};
struct dst_entry *dst;
int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
if (saddr) {
memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
flags |= RT6_LOOKUP_F_HAS_SADDR;
}
dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
if (dst->error == 0)
return (struct rt6_info *) dst;
@ -697,6 +701,7 @@ out2:
void ip6_route_input(struct sk_buff *skb)
{
struct ipv6hdr *iph = skb->nh.ipv6h;
int flags = RT6_LOOKUP_F_HAS_SADDR;
struct flowi fl = {
.iif = skb->dev->ifindex,
.nl_u = {
@ -711,7 +716,9 @@ void ip6_route_input(struct sk_buff *skb)
},
.proto = iph->nexthdr,
};
int flags = rt6_need_strict(&iph->daddr) ? RT6_LOOKUP_F_IFACE : 0;
if (rt6_need_strict(&iph->daddr))
flags |= RT6_LOOKUP_F_IFACE;
skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
}
@ -794,6 +801,9 @@ struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
if (rt6_need_strict(&fl->fl6_dst))
flags |= RT6_LOOKUP_F_IFACE;
if (!ipv6_addr_any(&fl->fl6_src))
flags |= RT6_LOOKUP_F_HAS_SADDR;
return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
}
@ -1345,6 +1355,7 @@ static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
struct in6_addr *gateway,
struct net_device *dev)
{
int flags = RT6_LOOKUP_F_HAS_SADDR;
struct ip6rd_flowi rdfl = {
.fl = {
.oif = dev->ifindex,
@ -1357,7 +1368,9 @@ static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
},
.gateway = *gateway,
};
int flags = rt6_need_strict(dest) ? RT6_LOOKUP_F_IFACE : 0;
if (rt6_need_strict(dest))
flags |= RT6_LOOKUP_F_IFACE;
return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect);
}