372 строки
12 KiB
C
372 строки
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_UDP_TUNNEL_H
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#define __NET_UDP_TUNNEL_H
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#include <net/ip_tunnels.h>
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#include <net/udp.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/ipv6_stubs.h>
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#endif
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struct udp_port_cfg {
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u8 family;
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/* Used only for kernel-created sockets */
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union {
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struct in_addr local_ip;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr local_ip6;
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#endif
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};
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union {
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struct in_addr peer_ip;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr peer_ip6;
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#endif
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};
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__be16 local_udp_port;
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__be16 peer_udp_port;
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int bind_ifindex;
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unsigned int use_udp_checksums:1,
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use_udp6_tx_checksums:1,
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use_udp6_rx_checksums:1,
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ipv6_v6only:1;
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};
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int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp);
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#if IS_ENABLED(CONFIG_IPV6)
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int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp);
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#else
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static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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return 0;
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}
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#endif
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static inline int udp_sock_create(struct net *net,
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struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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if (cfg->family == AF_INET)
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return udp_sock_create4(net, cfg, sockp);
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if (cfg->family == AF_INET6)
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return udp_sock_create6(net, cfg, sockp);
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return -EPFNOSUPPORT;
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}
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typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
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typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk,
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struct sk_buff *skb);
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typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
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typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk,
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struct list_head *head,
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struct sk_buff *skb);
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typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
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int nhoff);
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struct udp_tunnel_sock_cfg {
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void *sk_user_data; /* user data used by encap_rcv call back */
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/* Used for setting up udp_sock fields, see udp.h for details */
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__u8 encap_type;
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udp_tunnel_encap_rcv_t encap_rcv;
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udp_tunnel_encap_err_lookup_t encap_err_lookup;
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udp_tunnel_encap_destroy_t encap_destroy;
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udp_tunnel_gro_receive_t gro_receive;
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udp_tunnel_gro_complete_t gro_complete;
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};
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/* Setup the given (UDP) sock to receive UDP encapsulated packets */
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void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
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struct udp_tunnel_sock_cfg *sock_cfg);
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/* -- List of parsable UDP tunnel types --
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*
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* Adding to this list will result in serious debate. The main issue is
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* that this list is essentially a list of workarounds for either poorly
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* designed tunnels, or poorly designed device offloads.
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*
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* The parsing supported via these types should really be used for Rx
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* traffic only as the network stack will have already inserted offsets for
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* the location of the headers in the skb. In addition any ports that are
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* pushed should be kept within the namespace without leaking to other
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* devices such as VFs or other ports on the same device.
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*
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* It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the
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* need to use this for Rx checksum offload. It should not be necessary to
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* call this function to perform Tx offloads on outgoing traffic.
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*/
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enum udp_parsable_tunnel_type {
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UDP_TUNNEL_TYPE_VXLAN = BIT(0), /* RFC 7348 */
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UDP_TUNNEL_TYPE_GENEVE = BIT(1), /* draft-ietf-nvo3-geneve */
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UDP_TUNNEL_TYPE_VXLAN_GPE = BIT(2), /* draft-ietf-nvo3-vxlan-gpe */
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};
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struct udp_tunnel_info {
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unsigned short type;
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sa_family_t sa_family;
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__be16 port;
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u8 hw_priv;
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};
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/* Notify network devices of offloadable types */
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void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
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unsigned short type);
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void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
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unsigned short type);
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void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type);
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void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);
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static inline void udp_tunnel_get_rx_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev);
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}
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static inline void udp_tunnel_drop_rx_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev);
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}
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/* Transmit the skb using UDP encapsulation. */
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void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 tos, __u8 ttl,
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__be16 df, __be16 src_port, __be16 dst_port,
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bool xnet, bool nocheck);
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int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb,
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struct net_device *dev, struct in6_addr *saddr,
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struct in6_addr *daddr,
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__u8 prio, __u8 ttl, __be32 label,
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__be16 src_port, __be16 dst_port, bool nocheck);
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void udp_tunnel_sock_release(struct socket *sock);
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struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
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__be16 flags, __be64 tunnel_id,
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int md_size);
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#ifdef CONFIG_INET
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static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
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{
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int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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return iptunnel_handle_offloads(skb, type);
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}
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#endif
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static inline void udp_tunnel_encap_enable(struct socket *sock)
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{
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struct udp_sock *up = udp_sk(sock->sk);
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if (up->encap_enabled)
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return;
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up->encap_enabled = 1;
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#if IS_ENABLED(CONFIG_IPV6)
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if (sock->sk->sk_family == PF_INET6)
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ipv6_stub->udpv6_encap_enable();
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else
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#endif
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udp_encap_enable();
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}
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#define UDP_TUNNEL_NIC_MAX_TABLES 4
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enum udp_tunnel_nic_info_flags {
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/* Device callbacks may sleep */
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UDP_TUNNEL_NIC_INFO_MAY_SLEEP = BIT(0),
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/* Device only supports offloads when it's open, all ports
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* will be removed before close and re-added after open.
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*/
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UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(1),
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/* Device supports only IPv4 tunnels */
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UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(2),
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/* Device has hard-coded the IANA VXLAN port (4789) as VXLAN.
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* This port must not be counted towards n_entries of any table.
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* Driver will not receive any callback associated with port 4789.
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*/
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UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(3),
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};
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struct udp_tunnel_nic;
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#define UDP_TUNNEL_NIC_MAX_SHARING_DEVICES (U16_MAX / 2)
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struct udp_tunnel_nic_shared {
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struct udp_tunnel_nic *udp_tunnel_nic_info;
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struct list_head devices;
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};
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struct udp_tunnel_nic_shared_node {
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struct net_device *dev;
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struct list_head list;
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};
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/**
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* struct udp_tunnel_nic_info - driver UDP tunnel offload information
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* @set_port: callback for adding a new port
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* @unset_port: callback for removing a port
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* @sync_table: callback for syncing the entire port table at once
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* @shared: reference to device global state (optional)
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* @flags: device flags from enum udp_tunnel_nic_info_flags
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* @tables: UDP port tables this device has
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* @tables.n_entries: number of entries in this table
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* @tables.tunnel_types: types of tunnels this table accepts
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*
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* Drivers are expected to provide either @set_port and @unset_port callbacks
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* or the @sync_table callback. Callbacks are invoked with rtnl lock held.
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*
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* Devices which (misguidedly) share the UDP tunnel port table across multiple
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* netdevs should allocate an instance of struct udp_tunnel_nic_shared and
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* point @shared at it.
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* There must never be more than %UDP_TUNNEL_NIC_MAX_SHARING_DEVICES devices
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* sharing a table.
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*
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* Known limitations:
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* - UDP tunnel port notifications are fundamentally best-effort -
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* it is likely the driver will both see skbs which use a UDP tunnel port,
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* while not being a tunneled skb, and tunnel skbs from other ports -
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* drivers should only use these ports for non-critical RX-side offloads,
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* e.g. the checksum offload;
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* - none of the devices care about the socket family at present, so we don't
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* track it. Please extend this code if you care.
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*/
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struct udp_tunnel_nic_info {
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/* one-by-one */
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int (*set_port)(struct net_device *dev,
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unsigned int table, unsigned int entry,
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struct udp_tunnel_info *ti);
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int (*unset_port)(struct net_device *dev,
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unsigned int table, unsigned int entry,
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struct udp_tunnel_info *ti);
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/* all at once */
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int (*sync_table)(struct net_device *dev, unsigned int table);
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struct udp_tunnel_nic_shared *shared;
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unsigned int flags;
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struct udp_tunnel_nic_table_info {
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unsigned int n_entries;
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unsigned int tunnel_types;
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} tables[UDP_TUNNEL_NIC_MAX_TABLES];
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};
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/* UDP tunnel module dependencies
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*
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* Tunnel drivers are expected to have a hard dependency on the udp_tunnel
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* module. NIC drivers are not, they just attach their
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* struct udp_tunnel_nic_info to the netdev and wait for callbacks to come.
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* Loading a tunnel driver will cause the udp_tunnel module to be loaded
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* and only then will all the required state structures be allocated.
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* Since we want a weak dependency from the drivers and the core to udp_tunnel
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* we call things through the following stubs.
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*/
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struct udp_tunnel_nic_ops {
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void (*get_port)(struct net_device *dev, unsigned int table,
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unsigned int idx, struct udp_tunnel_info *ti);
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void (*set_port_priv)(struct net_device *dev, unsigned int table,
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unsigned int idx, u8 priv);
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void (*add_port)(struct net_device *dev, struct udp_tunnel_info *ti);
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void (*del_port)(struct net_device *dev, struct udp_tunnel_info *ti);
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void (*reset_ntf)(struct net_device *dev);
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size_t (*dump_size)(struct net_device *dev, unsigned int table);
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int (*dump_write)(struct net_device *dev, unsigned int table,
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struct sk_buff *skb);
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};
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#ifdef CONFIG_INET
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extern const struct udp_tunnel_nic_ops *udp_tunnel_nic_ops;
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#else
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#define udp_tunnel_nic_ops ((struct udp_tunnel_nic_ops *)NULL)
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#endif
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static inline void
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udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table,
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unsigned int idx, struct udp_tunnel_info *ti)
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{
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/* This helper is used from .sync_table, we indicate empty entries
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* by zero'ed @ti. Drivers which need to know the details of a port
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* when it gets deleted should use the .set_port / .unset_port
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* callbacks.
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* Zero out here, otherwise !CONFIG_INET causes uninitilized warnings.
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*/
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memset(ti, 0, sizeof(*ti));
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if (udp_tunnel_nic_ops)
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udp_tunnel_nic_ops->get_port(dev, table, idx, ti);
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}
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static inline void
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udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table,
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unsigned int idx, u8 priv)
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{
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if (udp_tunnel_nic_ops)
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udp_tunnel_nic_ops->set_port_priv(dev, table, idx, priv);
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}
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static inline void
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udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti)
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{
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if (udp_tunnel_nic_ops)
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udp_tunnel_nic_ops->add_port(dev, ti);
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}
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static inline void
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udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti)
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{
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if (udp_tunnel_nic_ops)
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udp_tunnel_nic_ops->del_port(dev, ti);
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}
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/**
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* udp_tunnel_nic_reset_ntf() - device-originating reset notification
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* @dev: network interface device structure
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*
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* Called by the driver to inform the core that the entire UDP tunnel port
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* state has been lost, usually due to device reset. Core will assume device
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* forgot all the ports and issue .set_port and .sync_table callbacks as
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* necessary.
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*
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* This function must be called with rtnl lock held, and will issue all
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* the callbacks before returning.
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*/
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static inline void udp_tunnel_nic_reset_ntf(struct net_device *dev)
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{
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if (udp_tunnel_nic_ops)
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udp_tunnel_nic_ops->reset_ntf(dev);
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}
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static inline size_t
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udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table)
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{
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if (!udp_tunnel_nic_ops)
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return 0;
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return udp_tunnel_nic_ops->dump_size(dev, table);
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}
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static inline int
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udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table,
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struct sk_buff *skb)
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{
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if (!udp_tunnel_nic_ops)
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return 0;
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return udp_tunnel_nic_ops->dump_write(dev, table, skb);
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}
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#endif
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