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authorAndy Zhou <azhou@nicira.com>2014-09-17 04:31:17 +0400
committerDavid S. Miller <davem@davemloft.net>2014-09-19 23:57:15 +0400
commit6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d (patch)
tree4855feb2fa46451d755bf841a3e463ba2a8053a0 /net/ipv4/udp_tunnel.c
parentfd384412e199b62c3ddaabd18dce86d0e164c5b9 (diff)
downloadlinux-6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d.tar.xz
udp-tunnel: Add a few more UDP tunnel APIs
Added a few more UDP tunnel APIs that can be shared by UDP based tunnel protocol implementation. The main ones are highlighted below. setup_udp_tunnel_sock() configures UDP listener socket for receiving UDP encapsulated packets. udp_tunnel_xmit_skb() and upd_tunnel6_xmit_skb() transmit skb using UDP encapsulation. udp_tunnel_sock_release() closes the UDP tunnel listener socket. Signed-off-by: Andy Zhou <azhou@nicira.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.c53
1 files changed, 52 insertions, 1 deletions
diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
index 7fccf6c3417a..1671263e5fa0 100644
--- a/net/ipv4/udp_tunnel.c
+++ b/net/ipv4/udp_tunnel.c
@@ -11,7 +11,7 @@
int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
struct socket **sockp)
{
- int err = -EINVAL;
+ int err;
struct socket *sock = NULL;
struct sockaddr_in udp_addr;
@@ -54,4 +54,55 @@ error:
}
EXPORT_SYMBOL(udp_sock_create4);
+void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
+ struct udp_tunnel_sock_cfg *cfg)
+{
+ struct sock *sk = sock->sk;
+
+ /* Disable multicast loopback */
+ inet_sk(sk)->mc_loop = 0;
+
+ /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
+ udp_set_convert_csum(sk, true);
+
+ rcu_assign_sk_user_data(sk, cfg->sk_user_data);
+
+ udp_sk(sk)->encap_type = cfg->encap_type;
+ udp_sk(sk)->encap_rcv = cfg->encap_rcv;
+ udp_sk(sk)->encap_destroy = cfg->encap_destroy;
+
+ udp_tunnel_encap_enable(sock);
+}
+EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
+
+int udp_tunnel_xmit_skb(struct socket *sock, struct rtable *rt,
+ struct sk_buff *skb, __be32 src, __be32 dst,
+ __u8 tos, __u8 ttl, __be16 df, __be16 src_port,
+ __be16 dst_port, bool xnet)
+{
+ struct udphdr *uh;
+
+ __skb_push(skb, sizeof(*uh));
+ skb_reset_transport_header(skb);
+ uh = udp_hdr(skb);
+
+ uh->dest = dst_port;
+ uh->source = src_port;
+ uh->len = htons(skb->len);
+
+ udp_set_csum(sock->sk->sk_no_check_tx, skb, src, dst, skb->len);
+
+ return iptunnel_xmit(sock->sk, rt, skb, src, dst, IPPROTO_UDP,
+ tos, ttl, df, xnet);
+}
+EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
+
+void udp_tunnel_sock_release(struct socket *sock)
+{
+ rcu_assign_sk_user_data(sock->sk, NULL);
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+ sk_release_kernel(sock->sk);
+}
+EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
+
MODULE_LICENSE("GPL");