ipv4: process socket-level control messages in IPv4
Process socket-level control messages by invoking
__sock_cmsg_send in ip_cmsg_send for control messages on
the SOL_SOCKET layer.
This makes sure whenever ip_cmsg_send is called in udp, icmp,
and raw, we also process socket-level control messages.
Note that this commit interprets new control messages that
were ignored before. As such, this commit does not change
the behavior of IPv4 control messages.
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 035ad64..1b7c077 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -219,11 +219,12 @@
}
EXPORT_SYMBOL(ip_cmsg_recv_offset);
-int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
+int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
bool allow_ipv6)
{
int err, val;
struct cmsghdr *cmsg;
+ struct net *net = sock_net(sk);
for_each_cmsghdr(cmsg, msg) {
if (!CMSG_OK(msg, cmsg))
@@ -244,6 +245,12 @@
continue;
}
#endif
+ if (cmsg->cmsg_level == SOL_SOCKET) {
+ if (__sock_cmsg_send(sk, msg, cmsg, &ipc->sockc))
+ return -EINVAL;
+ continue;
+ }
+
if (cmsg->cmsg_level != SOL_IP)
continue;
switch (cmsg->cmsg_type) {