datapath: Account for "udp: Add udp_sock_create for UDP tunnels to op…

…en listener socket"

Upstream commit:
    udp: Add udp_sock_create for UDP tunnels to open listener socket

    Added udp_tunnel.c which can contain some common functions for UDP
    tunnels. The first function in this is udp_sock_create which is used
    to open the listener port for a UDP tunnel.

    Signed-off-by: Tom Herbert <therbert@google.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Upstream: 8024e028 ("udp: Add udp_sock_create for UDP tunnels to open listener socket")
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Thomas Graf <tgraf@noironetworks.com>

datapath/linux/.gitignore

@@ -38,6 +38,7 @@
 /time.c
 /tmp
 /tunnel.c
+/udp_tunnel.c
 /utils.c
 /vlan.c
 /vport-generic.c

datapath/linux/Modules.mk

@@ -11,6 +11,7 @@ openvswitch_sources += \
 	linux/compat/net_namespace.c \
 	linux/compat/reciprocal_div.c \
 	linux/compat/skbuff-openvswitch.c \
+	linux/compat/udp_tunnel.c \
 	linux/compat/vxlan.c	\
 	linux/compat/utils.c
 openvswitch_headers += \
@@ -71,6 +72,7 @@ openvswitch_headers += \
 	linux/compat/include/net/net_namespace.h \
 	linux/compat/include/net/netlink.h \
 	linux/compat/include/net/udp.h \
+	linux/compat/include/net/udp_tunnel.h \
 	linux/compat/include/net/sock.h \
 	linux/compat/include/net/vxlan.h \
 	linux/compat/include/net/sctp/checksum.h

datapath/linux/compat/include/net/udp_tunnel.h

@@ -0,0 +1,40 @@
+#ifndef __NET_UDP_TUNNEL_WRAPPER_H
+#define __NET_UDP_TUNNEL_WRAPPER_H
+
+#include <linux/version.h>
+#include <linux/kconfig.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
+#include_next <net/udp_tunnel.h>
+#else
+
+struct udp_port_cfg {
+	u8			family;
+
+	/* Used only for kernel-created sockets */
+	union {
+		struct in_addr		local_ip;
+#if IS_ENABLED(CONFIG_IPV6)
+		struct in6_addr		local_ip6;
+#endif
+	};
+
+	union {
+		struct in_addr		peer_ip;
+#if IS_ENABLED(CONFIG_IPV6)
+		struct in6_addr		peer_ip6;
+#endif
+	};
+
+	__be16			local_udp_port;
+	__be16			peer_udp_port;
+	unsigned int		use_udp_checksums:1,
+				use_udp6_tx_checksums:1,
+				use_udp6_rx_checksums:1;
+};
+
+int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
+		    struct socket **sockp);
+
+#endif /* Linux version < 3.17 */
+#endif

datapath/linux/compat/udp_tunnel.c

@@ -0,0 +1,98 @@
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/udp.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+#include <net/net_namespace.h>
+
+int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
+		    struct socket **sockp)
+{
+	int err = -EINVAL;
+	struct socket *sock = NULL;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (cfg->family == AF_INET6) {
+		struct sockaddr_in6 udp6_addr;
+
+		err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock);
+		if (err < 0)
+			goto error;
+
+		sk_change_net(sock->sk, net);
+
+		udp6_addr.sin6_family = AF_INET6;
+		memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
+		       sizeof(udp6_addr.sin6_addr));
+		udp6_addr.sin6_port = cfg->local_udp_port;
+		err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
+				  sizeof(udp6_addr));
+		if (err < 0)
+			goto error;
+
+		if (cfg->peer_udp_port) {
+			udp6_addr.sin6_family = AF_INET6;
+			memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
+			       sizeof(udp6_addr.sin6_addr));
+			udp6_addr.sin6_port = cfg->peer_udp_port;
+			err = kernel_connect(sock,
+					     (struct sockaddr *)&udp6_addr,
+					     sizeof(udp6_addr), 0);
+		}
+		if (err < 0)
+			goto error;
+	} else
+#endif
+	if (cfg->family == AF_INET) {
+		struct sockaddr_in udp_addr;
+
+		err = sock_create_kern(AF_INET, SOCK_DGRAM, 0, &sock);
+		if (err < 0)
+			goto error;
+
+		sk_change_net(sock->sk, net);
+
+		udp_addr.sin_family = AF_INET;
+		udp_addr.sin_addr = cfg->local_ip;
+		udp_addr.sin_port = cfg->local_udp_port;
+		err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
+				  sizeof(udp_addr));
+		if (err < 0)
+			goto error;
+
+		if (cfg->peer_udp_port) {
+			udp_addr.sin_family = AF_INET;
+			udp_addr.sin_addr = cfg->peer_ip;
+			udp_addr.sin_port = cfg->peer_udp_port;
+			err = kernel_connect(sock,
+					     (struct sockaddr *)&udp_addr,
+					     sizeof(udp_addr), 0);
+			if (err < 0)
+				goto error;
+		}
+	} else {
+		return -EPFNOSUPPORT;
+	}
+
+
+	*sockp = sock;
+
+	return 0;
+
+error:
+	if (sock) {
+		kernel_sock_shutdown(sock, SHUT_RDWR);
+		sk_release_kernel(sock->sk);
+	}
+	*sockp = NULL;
+	return err;
+}
+
+#endif /* Linux version < 3.17 */