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[PPP] L2TP: Disallow non-UDP datagram sockets

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With the addition of UDP-Lite we need to refine the socket check so
that only genuine UDP sockets are allowed through.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-09-18 13:18:17 -07:00 committed by David S. Miller
parent 21d0c83302
commit a14d6abc94
1 changed files with 6 additions and 5 deletions
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11
drivers/net/pppol2tp.c
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@ -1326,12 +1326,14 @@ static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
goto err;
}
sk = sock->sk;
/* Quick sanity checks */
err = -ESOCKTNOSUPPORT;
if (sock->type != SOCK_DGRAM) {
err = -EPROTONOSUPPORT;
if (sk->sk_protocol != IPPROTO_UDP) {
PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
"tunl %hu: fd %d wrong type, got %d, expected %d\n",
tunnel_id, fd, sock->type, SOCK_DGRAM);
"tunl %hu: fd %d wrong protocol, got %d, expected %d\n",
tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP);
goto err;
}
err = -EAFNOSUPPORT;
@ -1343,7 +1345,6 @@ static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
}
err = -ENOTCONN;
sk = sock->sk;
/* Check if this socket has already been prepped */
tunnel = (struct pppol2tp_tunnel *)sk->sk_user_data;