Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / ip6_udp_tunnel.c

diff --git a/kernel/net/ipv6/ip6_udp_tunnel.c b/kernel/net/ipv6/ip6_udp_tunnel.c
new file mode 100644 (file)
index 0000000..bba8903
--- /dev/null
+++ b/kernel/net/ipv6/ip6_udp_tunnel.c
@@ -0,0 +1,106 @@
+#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 <linux/in6.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+
+int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
+                    struct socket **sockp)
+{
+       struct sockaddr_in6 udp6_addr;
+       int err;
+       struct socket *sock = NULL;
+
+       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);
+
+       *sockp = sock;
+       return 0;
+
+error:
+       if (sock) {
+               kernel_sock_shutdown(sock, SHUT_RDWR);
+               sk_release_kernel(sock->sk);
+       }
+       *sockp = NULL;
+       return err;
+}
+EXPORT_SYMBOL_GPL(udp_sock_create6);
+
+int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
+                        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, bool nocheck)
+{
+       struct udphdr *uh;
+       struct ipv6hdr *ip6h;
+
+       __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);
+
+       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(nocheck, skb, saddr, 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(sk, skb, dev);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
+
+MODULE_LICENSE("GPL");