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 socket *sock, struct rtable *rt, 81 struct sk_buff *skb, __be32 src, __be32 dst, 82 __u8 tos, __u8 ttl, __be16 df, __be16 src_port, 83 __be16 dst_port, bool xnet); 84 85 #if IS_ENABLED(CONFIG_IPV6) 86 int udp_tunnel6_xmit_skb(struct socket *sock, struct dst_entry *dst, 87 struct sk_buff *skb, struct net_device *dev, 88 struct in6_addr *saddr, struct in6_addr *daddr, 89 __u8 prio, __u8 ttl, __be16 src_port, 90 __be16 dst_port); 91 #endif 92 93 void udp_tunnel_sock_release(struct socket *sock); 94 95 static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb, 96 bool udp_csum) 97 { 98 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 99 100 return iptunnel_handle_offloads(skb, udp_csum, type); 101 } 102 103 static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff) 104 { 105 struct udphdr *uh; 106 107 uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr)); 108 skb_shinfo(skb)->gso_type |= uh->check ? 109 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 110 } 111 112 static inline void udp_tunnel_encap_enable(struct socket *sock) 113 { 114 #if IS_ENABLED(CONFIG_IPV6) 115 if (sock->sk->sk_family == PF_INET6) 116 ipv6_stub->udpv6_encap_enable(); 117 else 118 #endif 119 udp_encap_enable(); 120 } 121 122 #endif 123