include/net/udp_tunnel.h

   1 #ifndef __NET_UDP_TUNNEL_H
   2 #define __NET_UDP_TUNNEL_H
   3
   4 #include <net/ip_tunnels.h>
   5 #include <net/udp.h>
   6
   7 #if IS_ENABLED(CONFIG_IPV6)
   8 #include <net/ipv6.h>
   9 #include <net/addrconf.h>
  10 #endif
  11
  12 struct udp_port_cfg {
  13         u8                      family;
  14
  15         /* Used only for kernel-created sockets */
  16         union {
  17                 struct in_addr          local_ip;
  18 #if IS_ENABLED(CONFIG_IPV6)
  19                 struct in6_addr         local_ip6;
  20 #endif
  21         };
  22
  23         union {
  24                 struct in_addr          peer_ip;
  25 #if IS_ENABLED(CONFIG_IPV6)
  26                 struct in6_addr         peer_ip6;
  27 #endif
  28         };
  29
  30         __be16                  local_udp_port;
  31         __be16                  peer_udp_port;
  32         unsigned int            use_udp_checksums:1,
  33                                 use_udp6_tx_checksums:1,
  34                                 use_udp6_rx_checksums:1;
  35 };
  36
  37 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
  38                      struct socket **sockp);
  39
  40 #if IS_ENABLED(CONFIG_IPV6)
  41 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
  42                      struct socket **sockp);
  43 #else
  44 static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
  45                                    struct socket **sockp)
  46 {
  47         return 0;
  48 }
  49 #endif
  50
  51 static inline int udp_sock_create(struct net *net,
  52                                   struct udp_port_cfg *cfg,
  53                                   struct socket **sockp)
  54 {
  55         if (cfg->family == AF_INET)
  56                 return udp_sock_create4(net, cfg, sockp);
  57
  58         if (cfg->family == AF_INET6)
  59                 return udp_sock_create6(net, cfg, sockp);
  60
  61         return -EPFNOSUPPORT;
  62 }
  63
  64 typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
  65 typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
  66
  67 struct udp_tunnel_sock_cfg {
  68         void *sk_user_data;     /* user data used by encap_rcv call back */
  69         /* Used for setting up udp_sock fields, see udp.h for details */
  70         __u8  encap_type;
  71         udp_tunnel_encap_rcv_t encap_rcv;
  72         udp_tunnel_encap_destroy_t encap_destroy;
  73 };
  74
  75 /* Setup the given (UDP) sock to receive UDP encapsulated packets */
  76 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
  77                            struct udp_tunnel_sock_cfg *sock_cfg);
  78
  79 /* Transmit the skb using UDP encapsulation. */
  80 int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
  81                         __be32 src, __be32 dst, __u8 tos, __u8 ttl,
  82                         __be16 df, __be16 src_port, __be16 dst_port,
  83                         bool xnet, bool nocheck);
  84
  85 #if IS_ENABLED(CONFIG_IPV6)
  86 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
  87                          struct sk_buff *skb,
  88                          struct net_device *dev, struct in6_addr *saddr,
  89                          struct in6_addr *daddr,
  90                          __u8 prio, __u8 ttl, __be16 src_port,
  91                          __be16 dst_port, bool nocheck);
  92 #endif
  93
  94 void udp_tunnel_sock_release(struct socket *sock);
  95
  96 static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
  97                                                          bool udp_csum)
  98 {
  99         int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
 100
 101         return iptunnel_handle_offloads(skb, udp_csum, type);
 102 }
 103
 104 static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff)
 105 {
 106         struct udphdr *uh;
 107
 108         uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr));
 109         skb_shinfo(skb)->gso_type |= uh->check ?
 110                                 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
 111 }
 112
 113 static inline void udp_tunnel_encap_enable(struct socket *sock)
 114 {
 115 #if IS_ENABLED(CONFIG_IPV6)
 116         if (sock->sk->sk_family == PF_INET6)
 117                 ipv6_stub->udpv6_encap_enable();
 118         else
 119 #endif
 120                 udp_encap_enable();
 121 }
 122
 123 #endif