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

include/net/ip.h

+2 −1
Original line number Diff line number Diff line
@@ -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);

net/ipv4/ip_sockglue.c

+8 −1
Original line number Diff line number Diff line
@@ -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) {

net/ipv4/ping.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

net/ipv4/raw.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

net/ipv4/udp.c

+1 −2
Original line number Diff line number Diff line
@@ -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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