Commit 6b102db5 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net: Add device index to tcp_md5sig 



Add support for userspace to specify a device index to limit the scope
of an entry via the TCP_MD5SIG_EXT setsockopt. The existing __tcpm_pad
is renamed to tcpm_ifindex and the new field is only checked if the new
TCP_MD5SIG_FLAG_IFINDEX is set in tcpm_flags. For now, the device index
must point to an L3 master device (e.g., VRF). The API and error
handling are setup to allow the constraint to be relaxed in the future
to any device index.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dea53bb8

include/uapi/linux/tcp.h

+3 −2
Original line number Diff line number Diff line
@@ -317,14 +317,15 @@ enum { 
#define TCP_MD5SIG_MAXKEYLEN	80



/* tcp_md5sig extension flags for TCP_MD5SIG_EXT */

#define TCP_MD5SIG_FLAG_PREFIX		1	/* address prefix length */

#define TCP_MD5SIG_FLAG_PREFIX		0x1	/* address prefix length */

#define TCP_MD5SIG_FLAG_IFINDEX		0x2	/* ifindex set */



struct tcp_md5sig {

	struct __kernel_sockaddr_storage tcpm_addr;	/* address associated */

	__u8	tcpm_flags;				/* extension flags */

	__u8	tcpm_prefixlen;				/* address prefix */

	__u16	tcpm_keylen;				/* key length */

	__u32	__tcpm_pad;				/* zero */

	int	tcpm_ifindex;				/* device index for scope */

	__u8	tcpm_key[TCP_MD5SIG_MAXKEYLEN];		/* key (binary) */

};

net/ipv4/tcp_ipv4.c

+18 −0
Original line number Diff line number Diff line
@@ -1196,6 +1196,24 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, 
			return -EINVAL;

	}



	if (optname == TCP_MD5SIG_EXT &&

	    cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) {

		struct net_device *dev;



		rcu_read_lock();

		dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex);

		if (dev && netif_is_l3_master(dev))

			l3index = dev->ifindex;



		rcu_read_unlock();



		/* ok to reference set/not set outside of rcu;

		 * right now device MUST be an L3 master

		 */

		if (!dev || !l3index)

			return -EINVAL;

	}



	addr = (union tcp_md5_addr *)&sin->sin_addr.s_addr;



	if (!cmd.tcpm_keylen)

net/ipv6/tcp_ipv6.c

+19 −1
Original line number Diff line number Diff line
@@ -578,10 +578,28 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, 
		prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128;

	}



	if (optname == TCP_MD5SIG_EXT &&

	    cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) {

		struct net_device *dev;



		rcu_read_lock();

		dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex);

		if (dev && netif_is_l3_master(dev))

			l3index = dev->ifindex;

		rcu_read_unlock();



		/* ok to reference set/not set outside of rcu;

		 * right now device MUST be an L3 master

		 */

		if (!dev || !l3index)

			return -EINVAL;

	}



	if (!cmd.tcpm_keylen) {

		if (ipv6_addr_v4mapped(&sin6->sin6_addr))

			return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],

					      AF_INET, prefixlen, l3index);

					      AF_INET, prefixlen,

					      l3index);

		return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,

				      AF_INET6, prefixlen, l3index);

	}

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