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 ipv6_v6only:1; 36 }; 37 38 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg, 39 struct socket **sockp); 40 41 #if IS_ENABLED(CONFIG_IPV6) 42 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg, 43 struct socket **sockp); 44 #else 45 static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg, 46 struct socket **sockp) 47 { 48 return 0; 49 } 50 #endif 51 52 static inline int udp_sock_create(struct net *net, 53 struct udp_port_cfg *cfg, 54 struct socket **sockp) 55 { 56 if (cfg->family == AF_INET) 57 return udp_sock_create4(net, cfg, sockp); 58 59 if (cfg->family == AF_INET6) 60 return udp_sock_create6(net, cfg, sockp); 61 62 return -EPFNOSUPPORT; 63 } 64 65 typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb); 66 typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk); 67 68 struct udp_tunnel_sock_cfg { 69 void *sk_user_data; /* user data used by encap_rcv call back */ 70 /* Used for setting up udp_sock fields, see udp.h for details */ 71 __u8 encap_type; 72 udp_tunnel_encap_rcv_t encap_rcv; 73 udp_tunnel_encap_destroy_t encap_destroy; 74 }; 75 76 /* Setup the given (UDP) sock to receive UDP encapsulated packets */ 77 void setup_udp_tunnel_sock(struct net *net, struct socket *sock, 78 struct udp_tunnel_sock_cfg *sock_cfg); 79 80 /* Transmit the skb using UDP encapsulation. */ 81 int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb, 82 __be32 src, __be32 dst, __u8 tos, __u8 ttl, 83 __be16 df, __be16 src_port, __be16 dst_port, 84 bool xnet, bool nocheck); 85 86 #if IS_ENABLED(CONFIG_IPV6) 87 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 88 struct sk_buff *skb, 89 struct net_device *dev, struct in6_addr *saddr, 90 struct in6_addr *daddr, 91 __u8 prio, __u8 ttl, __be16 src_port, 92 __be16 dst_port, bool nocheck); 93 #endif 94 95 void udp_tunnel_sock_release(struct socket *sock); 96 97 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family, 98 __be16 flags, __be64 tunnel_id, 99 int md_size); 100 101 static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb, 102 bool udp_csum) 103 { 104 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 105 106 return iptunnel_handle_offloads(skb, udp_csum, type); 107 } 108 109 static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff) 110 { 111 struct udphdr *uh; 112 113 uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr)); 114 skb_shinfo(skb)->gso_type |= uh->check ? 115 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 116 } 117 118 static inline void udp_tunnel_encap_enable(struct socket *sock) 119 { 120 #if IS_ENABLED(CONFIG_IPV6) 121 if (sock->sk->sk_family == PF_INET6) 122 ipv6_stub->udpv6_encap_enable(); 123 else 124 #endif 125 udp_encap_enable(); 126 } 127 128 #endif 129