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udp-tunnel: Add a few more UDP tunnel APIs

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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>
This commit is contained in:
Andy Zhou
2014-09-16 17:31:17 -07:00
committed by David S. Miller
parent fd384412e1
commit 6a93cc9052
3 changed files with 151 additions and 1 deletions
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net/ipv4/udp_tunnel.c
+52 -1
View File
@@ -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");