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authorAndy Zhou <azhou@nicira.com>2014-09-17 02:31:17 +0200
committerDavid S. Miller <davem@davemloft.net>2014-09-19 21:57:15 +0200
commit6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d (patch)
tree4855feb2fa46451d755bf841a3e463ba2a8053a0 /net/ipv6/ip6_udp_tunnel.c
parentudp_tunnel: Seperate ipv6 functions into its own file. (diff)
downloadlinux-6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d.tar.xz
linux-6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d.zip
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/ipv6/ip6_udp_tunnel.c')
-rw-r--r--net/ipv6/ip6_udp_tunnel.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
index bcfbb4b496fc..cbc990712cc1 100644
--- a/net/ipv6/ip6_udp_tunnel.c
+++ b/net/ipv6/ip6_udp_tunnel.c
@@ -61,3 +61,45 @@ error:
return err;
}
EXPORT_SYMBOL_GPL(udp_sock_create6);
+
+int udp_tunnel6_xmit_skb(struct socket *sock, struct dst_entry *dst,
+ struct sk_buff *skb, struct net_device *dev,
+ struct in6_addr *saddr, struct in6_addr *daddr,
+ __u8 prio, __u8 ttl, __be16 src_port, __be16 dst_port)
+{
+ struct udphdr *uh;
+ struct ipv6hdr *ip6h;
+ struct sock *sk = sock->sk;
+
+ __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);
+ uh->check = 0;
+
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
+ | IPSKB_REROUTED);
+ skb_dst_set(skb, dst);
+
+ udp6_set_csum(udp_get_no_check6_tx(sk), skb, &inet6_sk(sk)->saddr,
+ &sk->sk_v6_daddr, skb->len);
+
+ __skb_push(skb, sizeof(*ip6h));
+ skb_reset_network_header(skb);
+ ip6h = ipv6_hdr(skb);
+ ip6_flow_hdr(ip6h, prio, htonl(0));
+ ip6h->payload_len = htons(skb->len);
+ ip6h->nexthdr = IPPROTO_UDP;
+ ip6h->hop_limit = ttl;
+ ip6h->daddr = *daddr;
+ ip6h->saddr = *saddr;
+
+ ip6tunnel_xmit(skb, dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);