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 typedef struct sk_buff **(*udp_tunnel_gro_receive_t)(struct sock *sk, 68 struct sk_buff **head, 69 struct sk_buff *skb); 70 typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb, 71 int nhoff); 72 73 struct udp_tunnel_sock_cfg { 74 void *sk_user_data; /* user data used by encap_rcv call back */ 75 /* Used for setting up udp_sock fields, see udp.h for details */ 76 __u8 encap_type; 77 udp_tunnel_encap_rcv_t encap_rcv; 78 udp_tunnel_encap_destroy_t encap_destroy; 79 udp_tunnel_gro_receive_t gro_receive; 80 udp_tunnel_gro_complete_t gro_complete; 81 }; 82 83 /* Setup the given (UDP) sock to receive UDP encapsulated packets */ 84 void setup_udp_tunnel_sock(struct net *net, struct socket *sock, 85 struct udp_tunnel_sock_cfg *sock_cfg); 86 87 /* -- List of parsable UDP tunnel types -- 88 * 89 * Adding to this list will result in serious debate. The main issue is 90 * that this list is essentially a list of workarounds for either poorly 91 * designed tunnels, or poorly designed device offloads. 92 * 93 * The parsing supported via these types should really be used for Rx 94 * traffic only as the network stack will have already inserted offsets for 95 * the location of the headers in the skb. In addition any ports that are 96 * pushed should be kept within the namespace without leaking to other 97 * devices such as VFs or other ports on the same device. 98 * 99 * It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the 100 * need to use this for Rx checksum offload. It should not be necessary to 101 * call this function to perform Tx offloads on outgoing traffic. 102 */ 103 enum udp_parsable_tunnel_type { 104 UDP_TUNNEL_TYPE_VXLAN, /* RFC 7348 */ 105 UDP_TUNNEL_TYPE_GENEVE, /* draft-ietf-nvo3-geneve */ 106 UDP_TUNNEL_TYPE_VXLAN_GPE, /* draft-ietf-nvo3-vxlan-gpe */ 107 }; 108 109 struct udp_tunnel_info { 110 unsigned short type; 111 sa_family_t sa_family; 112 __be16 port; 113 }; 114 115 /* Notify network devices of offloadable types */ 116 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock, 117 unsigned short type); 118 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock, 119 unsigned short type); 120 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type); 121 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type); 122 123 static inline void udp_tunnel_get_rx_info(struct net_device *dev) 124 { 125 ASSERT_RTNL(); 126 call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev); 127 } 128 129 static inline void udp_tunnel_drop_rx_info(struct net_device *dev) 130 { 131 ASSERT_RTNL(); 132 call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev); 133 } 134 135 /* Transmit the skb using UDP encapsulation. */ 136 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb, 137 __be32 src, __be32 dst, __u8 tos, __u8 ttl, 138 __be16 df, __be16 src_port, __be16 dst_port, 139 bool xnet, bool nocheck); 140 141 #if IS_ENABLED(CONFIG_IPV6) 142 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 143 struct sk_buff *skb, 144 struct net_device *dev, struct in6_addr *saddr, 145 struct in6_addr *daddr, 146 __u8 prio, __u8 ttl, __be32 label, 147 __be16 src_port, __be16 dst_port, bool nocheck); 148 #endif 149 150 void udp_tunnel_sock_release(struct socket *sock); 151 152 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family, 153 __be16 flags, __be64 tunnel_id, 154 int md_size); 155 156 #ifdef CONFIG_INET 157 static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum) 158 { 159 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 160 161 return iptunnel_handle_offloads(skb, type); 162 } 163 #endif 164 165 static inline void udp_tunnel_encap_enable(struct socket *sock) 166 { 167 #if IS_ENABLED(CONFIG_IPV6) 168 if (sock->sk->sk_family == PF_INET6) 169 ipv6_stub->udpv6_encap_enable(); 170 else 171 #endif 172 udp_encap_enable(); 173 } 174 175 #endif 176