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ipv6: Nonlocal bind

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Add support to allow non-local binds similar to how this was done for IPv4.
Non-local binds are very useful in emulating the Internet in a box, etc.

This add the ip_nonlocal_bind sysctl under ipv6.

Testing:

Set up nonlocal binding and receive routing on a host, e.g.:

ip -6 rule add from ::/0 iif eth0 lookup 200
ip -6 route add local 2001:0:0:1::/64 dev lo proto kernel scope host table 200
sysctl -w net.ipv6.ip_nonlocal_bind=1

Set up routing to 2001:0:0:1::/64 on peer to go to first host

ping6 -I 2001:0:0:1::1 peer-address -- to verify

Signed-off-by: Tom Herbert <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Herbert 2015-07-08 16:58:22 -07:00 • committed by David S. Miller
commit 35a256fee5
6 changed files with 20 additions and 3 deletions
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3
net/ipv4/ping.c
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@ -363,7 +363,8 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
scoped);
rcu_read_unlock();
if (!(isk->freebind || isk->transparent || has_addr ||
if (!(net->ipv6.sysctl.ip_nonlocal_bind ||
isk->freebind || isk->transparent || has_addr ||
addr_type == IPV6_ADDR_ANY))
return -EADDRNOTAVAIL;