forked from Minki/linux
6a93cc9052
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>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
#ifndef __NET_UDP_TUNNEL_H
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#define __NET_UDP_TUNNEL_H
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#include <net/ip_tunnels.h>
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#include <net/udp.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#endif
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struct udp_port_cfg {
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u8 family;
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/* Used only for kernel-created sockets */
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union {
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struct in_addr local_ip;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr local_ip6;
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#endif
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};
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union {
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struct in_addr peer_ip;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr peer_ip6;
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#endif
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};
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__be16 local_udp_port;
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__be16 peer_udp_port;
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unsigned int use_udp_checksums:1,
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use_udp6_tx_checksums:1,
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use_udp6_rx_checksums:1;
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};
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int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp);
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#if IS_ENABLED(CONFIG_IPV6)
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int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp);
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#else
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static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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return 0;
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}
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#endif
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static inline int udp_sock_create(struct net *net,
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struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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if (cfg->family == AF_INET)
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return udp_sock_create4(net, cfg, sockp);
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if (cfg->family == AF_INET6)
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return udp_sock_create6(net, cfg, sockp);
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return -EPFNOSUPPORT;
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}
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typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
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typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
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struct udp_tunnel_sock_cfg {
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void *sk_user_data; /* user data used by encap_rcv call back */
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/* Used for setting up udp_sock fields, see udp.h for details */
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__u8 encap_type;
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udp_tunnel_encap_rcv_t encap_rcv;
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udp_tunnel_encap_destroy_t encap_destroy;
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};
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/* Setup the given (UDP) sock to receive UDP encapsulated packets */
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void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
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struct udp_tunnel_sock_cfg *sock_cfg);
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/* Transmit the skb using UDP encapsulation. */
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int udp_tunnel_xmit_skb(struct socket *sock, struct rtable *rt,
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struct sk_buff *skb, __be32 src, __be32 dst,
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__u8 tos, __u8 ttl, __be16 df, __be16 src_port,
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__be16 dst_port, bool xnet);
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#if IS_ENABLED(CONFIG_IPV6)
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int udp_tunnel6_xmit_skb(struct socket *sock, struct dst_entry *dst,
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struct sk_buff *skb, struct net_device *dev,
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struct in6_addr *saddr, struct in6_addr *daddr,
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__u8 prio, __u8 ttl, __be16 src_port,
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__be16 dst_port);
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#endif
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void udp_tunnel_sock_release(struct socket *sock);
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static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
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bool udp_csum)
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{
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int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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return iptunnel_handle_offloads(skb, udp_csum, type);
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}
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static inline void udp_tunnel_encap_enable(struct socket *sock)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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if (sock->sk->sk_family == PF_INET6)
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ipv6_stub->udpv6_encap_enable();
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else
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#endif
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udp_encap_enable();
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}
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#endif
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