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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __NET_UDP_TUNNEL_H #define __NET_UDP_TUNNEL_H #include <net/ip_tunnels.h> #include <net/udp.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> #include <net/ipv6_stubs.h> #endif struct udp_port_cfg { u8 family; / Used only for kernel-created sockets / union { struct in_addr local_ip; #if IS_ENABLED(CONFIG_IPV6) struct in6_addr local_ip6; #endif }; union { struct in_addr peer_ip; #if IS_ENABLED(CONFIG_IPV6) struct in6_addr peer_ip6; #endif }; __be16 local_udp_port; __be16 peer_udp_port; int bind_ifindex; unsigned int use_udp_checksums:1, use_udp6_tx_checksums:1, use_udp6_rx_checksums:1, ipv6_v6only:1; }; int udp_sock_create4(struct net net, struct udp_port_cfg cfg, struct socket sockp); #if IS_ENABLED(CONFIG_IPV6) int udp_sock_create6(struct net net, struct udp_port_cfg cfg, struct socket sockp); #else static inline int udp_sock_create6(struct net net, struct udp_port_cfg cfg, struct socket sockp) { return 0; } #endif static inline int udp_sock_create(struct net net, struct udp_port_cfg cfg, struct socket sockp) { if (cfg->family == AF_INET) return udp_sock_create4(net, cfg, sockp); if (cfg->family == AF_INET6) return udp_sock_create6(net, cfg, sockp); return -EPFNOSUPPORT; } typedef int (udp_tunnel_encap_rcv_t)(struct sock sk, struct sk_buff skb); typedef int (udp_tunnel_encap_err_lookup_t)(struct sock sk, struct sk_buff skb); typedef void (udp_tunnel_encap_destroy_t)(struct sock sk); typedef struct sk_buff (udp_tunnel_gro_receive_t)(struct sock sk, struct list_head head, struct sk_buff skb); typedef int (udp_tunnel_gro_complete_t)(struct sock sk, struct sk_buff skb, int nhoff); struct udp_tunnel_sock_cfg { void sk_user_data; /* user data used by encap_rcv call back / / Used for setting up udp_sock fields, see udp.h for details / __u8 encap_type; udp_tunnel_encap_rcv_t encap_rcv; udp_tunnel_encap_err_lookup_t encap_err_lookup; udp_tunnel_encap_destroy_t encap_destroy; udp_tunnel_gro_receive_t gro_receive; udp_tunnel_gro_complete_t gro_complete; }; / Setup the given (UDP) sock to receive UDP encapsulated packets / void setup_udp_tunnel_sock(struct net net, struct socket sock, struct udp_tunnel_sock_cfg sock_cfg); /* -- List of parsable UDP tunnel types -- * * Adding to this list will result in serious debate. The main issue is * that this list is essentially a list of workarounds for either poorly * designed tunnels, or poorly designed device offloads. * * The parsing supported via these types should really be used for Rx * traffic only as the network stack will have already inserted offsets for * the location of the headers in the skb. In addition any ports that are * pushed should be kept within the namespace without leaking to other * devices such as VFs or other ports on the same device. * * It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the * need to use this for Rx checksum offload. It should not be necessary to * call this function to perform Tx offloads on outgoing traffic. / enum udp_parsable_tunnel_type { UDP_TUNNEL_TYPE_VXLAN, / RFC 7348 / UDP_TUNNEL_TYPE_GENEVE, / draft-ietf-nvo3-geneve / UDP_TUNNEL_TYPE_VXLAN_GPE, / draft-ietf-nvo3-vxlan-gpe / }; struct udp_tunnel_info { unsigned short type; sa_family_t sa_family; __be16 port; }; / Notify network devices of offloadable types / void udp_tunnel_push_rx_port(struct net_device dev, struct socket sock, unsigned short type); void udp_tunnel_drop_rx_port(struct net_device dev, struct socket sock, unsigned short type); void udp_tunnel_notify_add_rx_port(struct socket sock, unsigned short type); void udp_tunnel_notify_del_rx_port(struct socket sock, unsigned short type); static inline void udp_tunnel_get_rx_info(struct net_device dev) { ASSERT_RTNL(); call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev); } static inline void udp_tunnel_drop_rx_info(struct net_device dev) { ASSERT_RTNL(); call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev); } / Transmit the skb using UDP encapsulation. / void udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff skb, __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port, bool xnet, bool nocheck); #if IS_ENABLED(CONFIG_IPV6) int udp_tunnel6_xmit_skb(struct dst_entry dst, struct sock sk, struct sk_buff skb, struct net_device dev, struct in6_addr saddr, struct in6_addr daddr, __u8 prio, __u8 ttl, __be32 label, __be16 src_port, __be16 dst_port, bool nocheck); #endif void udp_tunnel_sock_release(struct socket sock); struct metadata_dst udp_tun_rx_dst(struct sk_buff skb, unsigned short family, __be16 flags, __be64 tunnel_id, int md_size); #ifdef CONFIG_INET static inline int udp_tunnel_handle_offloads(struct sk_buff skb, bool udp_csum) { int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; return iptunnel_handle_offloads(skb, type); } #endif static inline void udp_tunnel_encap_enable(struct socket sock) { struct udp_sock up = udp_sk(sock->sk); if (up->encap_enabled) return; up->encap_enabled = 1; #if IS_ENABLED(CONFIG_IPV6) if (sock->sk->sk_family == PF_INET6) ipv6_stub->udpv6_encap_enable(); #endif udp_encap_enable(); } #endif

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