Commit 24025c46 authored by Soheil Hassas Yeganeh's avatar Soheil Hassas Yeganeh Committed by David S. Miller

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: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3dd17e63
......@@ -56,6 +56,7 @@ static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
}
struct ipcm_cookie {
struct sockcm_cookie sockc;
__be32 addr;
int oif;
struct ip_options_rcu *opt;
......@@ -550,7 +551,7 @@ int ip_options_rcv_srr(struct sk_buff *skb);
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
int ip_cmsg_send(struct net *net, struct msghdr *msg,
int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
struct ipcm_cookie *ipc, bool allow_ipv6);
int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
unsigned int optlen);
......
......@@ -219,11 +219,12 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
}
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 @@ int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
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) {
......
......@@ -747,7 +747,7 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
sock_tx_timestamp(sk, &ipc.tx_flags);
if (msg->msg_controllen) {
err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
err = ip_cmsg_send(sk, msg, &ipc, false);
if (unlikely(err)) {
kfree(ipc.opt);
return err;
......
......@@ -548,7 +548,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
ipc.oif = sk->sk_bound_dev_if;
if (msg->msg_controllen) {
err = ip_cmsg_send(net, msg, &ipc, false);
err = ip_cmsg_send(sk, msg, &ipc, false);
if (unlikely(err)) {
kfree(ipc.opt);
goto out;
......
......@@ -1034,8 +1034,7 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
sock_tx_timestamp(sk, &ipc.tx_flags);
if (msg->msg_controllen) {
err = ip_cmsg_send(sock_net(sk), msg, &ipc,
sk->sk_family == AF_INET6);
err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6);
if (unlikely(err)) {
kfree(ipc.opt);
return err;
......
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