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authorTom Herbert <therbert@google.com>2014-07-13 19:49:37 -0700
committerDavid S. Miller <davem@davemloft.net>2014-07-14 16:12:15 -0700
commit8024e02879ddd5042be02c70557f74cdc70b44b4 (patch)
treebd11e8dae8b5d397c4d9e43e0af3c9330de24658 /net/ipv4/udp_tunnel.c
parent39b1c29b7bb932d7c2bd5680a927f269944bdfda (diff)
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>
Diffstat (limited to 'net/ipv4/udp_tunnel.c')
-rw-r--r--net/ipv4/udp_tunnel.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
new file mode 100644
index 000000000000..61ec1a65207e
--- /dev/null
+++ b/net/ipv4/udp_tunnel.c
@@ -0,0 +1,100 @@
+#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;
+
+ udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
+ udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
+ } 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;
+ }
+
+ sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
+ } 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;
+}
+EXPORT_SYMBOL(udp_sock_create);
+
+MODULE_LICENSE("GPL");