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ipv6: Consider sk_bound_dev_if when binding a socket to a v4 mapped address 

Similar to c5ee066333 ("ipv6: Consider sk_bound_dev_if when binding a
socket to an address"), binding a socket to v4 mapped addresses needs to
consider if the socket is bound to a device.

This problem also exists from the beginning of git history.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-01-04 16:58:15 -08:00 committed by David S. Miller
parent ae84e4a8eb
commit ec90ad3349
1 changed files with 10 additions and 1 deletions
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11
net/ipv6/af_inet6.c
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@ -310,6 +310,7 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
/* Check if the address belongs to the host. */
if (addr_type == IPV6_ADDR_MAPPED) {
struct net_device *dev = NULL;
int chk_addr_ret;
/* Binding to v4-mapped address on a v6-only socket
@ -320,9 +321,17 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
goto out;
}
if (sk->sk_bound_dev_if) {
dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
if (!dev) {
err = -ENODEV;
goto out;
}
}
/* Reproduce AF_INET checks to make the bindings consistent */
v4addr = addr->sin6_addr.s6_addr32[3];
chk_addr_ret = inet_addr_type(net, v4addr);
chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
if (!inet_can_nonlocal_bind(net, inet) &&
v4addr != htonl(INADDR_ANY) &&
chk_addr_ret != RTN_LOCAL &&