Commit 54dc3e33 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net: ipv6: Allow connect to linklocal address from socket bound to vrf 



Allow a process bound to a VRF to connect to a linklocal address.
Currently, this fails because of a mismatch between the scope of the
linklocal address and the sk_bound_dev_if inherited by the VRF binding:
    $ ssh -6 fe80::70b8:cff:fedd:ead8%eth1
    ssh: connect to host fe80::70b8:cff:fedd:ead8%eth1 port 22: Invalid argument

Relax the scope check to allow the socket to be bound to the same L3
device as the scope id.

This makes ipv6 linklocal consistent with other relaxed checks enabled
by commits 1ff23bee ("net: l3mdev: Allow send on enslaved interface")
and 7bb387c5 ("net: Allow IP_MULTICAST_IF to set index to L3 slave").

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3e49ca9

include/net/sock.h

+20 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ 
#include <net/tcp_states.h>

#include <linux/net_tstamp.h>

#include <net/smc.h>

#include <net/l3mdev.h>



/*

 * This structure really needs to be cleaned up.
@@ -2399,4 +2400,23 @@ static inline void sk_pacing_shift_update(struct sock *sk, int val) 
	sk->sk_pacing_shift = val;

}



/* if a socket is bound to a device, check that the given device

 * index is either the same or that the socket is bound to an L3

 * master device and the given device index is also enslaved to

 * that L3 master

 */

static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif)

{

	int mdif;



	if (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)

		return true;



	mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif);

	if (mdif && mdif == sk->sk_bound_dev_if)

		return true;



	return false;

}



#endif	/* _SOCK_H */

net/ipv6/datagram.c

+1 −2
Original line number Diff line number Diff line
@@ -221,8 +221,7 @@ ipv4_connected: 
	if (__ipv6_addr_needs_scope_id(addr_type)) {

		if (addr_len >= sizeof(struct sockaddr_in6) &&

		    usin->sin6_scope_id) {

			if (sk->sk_bound_dev_if &&

			    sk->sk_bound_dev_if != usin->sin6_scope_id) {

			if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {

				err = -EINVAL;

				goto out;

			}

net/ipv6/tcp_ipv6.c

+1 −2
Original line number Diff line number Diff line
@@ -176,8 +176,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 
			/* If interface is set while binding, indices

			 * must coincide.

			 */

			if (sk->sk_bound_dev_if &&

			    sk->sk_bound_dev_if != usin->sin6_scope_id)

			if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id))

				return -EINVAL;



			sk->sk_bound_dev_if = usin->sin6_scope_id;

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