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ipv6: Use icmpv6_notify() to propagate redirect, instead of rt6_redirect().

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And delete rt6_redirect(), since it is no longer used.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-07-12 00:33:37 -07:00
parent ec18d9a269
commit b94f1c0904
5 changed files with 4 additions and 111 deletions
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107
net/ipv6/route.c
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@@ -1633,92 +1633,6 @@ static int ip6_route_del(struct fib6_config *cfg)
return err;
}
/*
* Handle redirects
*/
struct ip6rd_flowi {
struct flowi6 fl6;
struct in6_addr gateway;
};
static struct rt6_info *__ip6_route_redirect(struct net *net,
struct fib6_table *table,
struct flowi6 *fl6,
int flags)
{
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
struct rt6_info *rt;
struct fib6_node *fn;
/*
* Get the "current" route for this destination and
* check if the redirect has come from approriate router.
*
* RFC 2461 specifies that redirects should only be
* accepted if they come from the nexthop to the target.
* Due to the way the routes are chosen, this notion
* is a bit fuzzy and one might need to check all possible
* routes.
*/
read_lock_bh(&table->tb6_lock);
fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
restart:
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
/*
* Current route is on-link; redirect is always invalid.
*
* Seems, previous statement is not true. It could
* be node, which looks for us as on-link (f.e. proxy ndisc)
* But then router serving it might decide, that we should
* know truth 8)8) --ANK (980726).
*/
if (rt6_check_expired(rt))
continue;
if (!(rt->rt6i_flags & RTF_GATEWAY))
continue;
if (fl6->flowi6_oif != rt->dst.dev->ifindex)
continue;
if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
continue;
break;
}
if (!rt)
rt = net->ipv6.ip6_null_entry;
BACKTRACK(net, &fl6->saddr);
out:
dst_hold(&rt->dst);
read_unlock_bh(&table->tb6_lock);
return rt;
};
static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest,
const struct in6_addr *src,
const struct in6_addr *gateway,
struct net_device *dev)
{
int flags = RT6_LOOKUP_F_HAS_SADDR;
struct net *net = dev_net(dev);
struct ip6rd_flowi rdfl = {
.fl6 = {
.flowi6_oif = dev->ifindex,
.daddr = *dest,
.saddr = *src,
},
};
rdfl.gateway = *gateway;
if (rt6_need_strict(dest))
flags |= RT6_LOOKUP_F_IFACE;
return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6,
flags, __ip6_route_redirect);
}
static void rt6_do_redirect(struct dst_entry *dst, struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
@@ -1848,27 +1762,6 @@ out:
neigh_release(neigh);
}
void rt6_redirect(struct sk_buff *skb)
{
const struct in6_addr *target;
const struct in6_addr *dest;
const struct in6_addr *src;
const struct in6_addr *saddr;
struct icmp6hdr *icmph;
struct rt6_info *rt;
icmph = icmp6_hdr(skb);
target = (const struct in6_addr *) (icmph + 1);
dest = target + 1;
src = &ipv6_hdr(skb)->daddr;
saddr = &ipv6_hdr(skb)->saddr;
rt = ip6_route_redirect(dest, src, saddr, skb->dev);
rt6_do_redirect(&rt->dst, skb);
dst_release(&rt->dst);
}
/*
* Misc support functions
*/