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l2tp: don't overwrite source address in l2tp_ip_bind()

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Applications using L2TP/IP sockets want to be able to bind() an L2TP/IP
socket to set the local tunnel id while leaving the auto-assigned source
address alone. So if no source address is supplied, don't overwrite
the address already stored in the socket.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2012-04-10 00:10:43 +00:00 committed by David S. Miller
parent d1f224ae18
commit c9be48dc8b
1 changed files with 2 additions and 1 deletions
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3
net/l2tp/l2tp_ip.c
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@ -271,7 +271,8 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
goto out;
inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
if (addr->l2tp_addr.s_addr)
inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
inet->inet_saddr = 0; /* Use device */
sk_dst_reset(sk);