include/net/udp_tunnel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NET_UDP_TUNNEL_H
   3 #define __NET_UDP_TUNNEL_H
   4
   5 #include <net/ip_tunnels.h>
   6 #include <net/udp.h>
   7
   8 #if IS_ENABLED(CONFIG_IPV6)
   9 #include <net/ipv6.h>
  10 #include <net/ipv6_stubs.h>
  11 #endif
  12
  13 struct udp_port_cfg {
  14         u8                      family;
  15
  16         /* Used only for kernel-created sockets */
  17         union {
  18                 struct in_addr          local_ip;
  19 #if IS_ENABLED(CONFIG_IPV6)
  20                 struct in6_addr         local_ip6;
  21 #endif
  22         };
  23
  24         union {
  25                 struct in_addr          peer_ip;
  26 #if IS_ENABLED(CONFIG_IPV6)
  27                 struct in6_addr         peer_ip6;
  28 #endif
  29         };
  30
  31         __be16                  local_udp_port;
  32         __be16                  peer_udp_port;
  33         int                     bind_ifindex;
  34         unsigned int            use_udp_checksums:1,
  35                                 use_udp6_tx_checksums:1,
  36                                 use_udp6_rx_checksums:1,
  37                                 ipv6_v6only:1;
  38 };
  39
  40 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
  41                      struct socket **sockp);
  42
  43 #if IS_ENABLED(CONFIG_IPV6)
  44 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
  45                      struct socket **sockp);
  46 #else
  47 static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
  48                                    struct socket **sockp)
  49 {
  50         return 0;
  51 }
  52 #endif
  53
  54 static inline int udp_sock_create(struct net *net,
  55                                   struct udp_port_cfg *cfg,
  56                                   struct socket **sockp)
  57 {
  58         if (cfg->family == AF_INET)
  59                 return udp_sock_create4(net, cfg, sockp);
  60
  61         if (cfg->family == AF_INET6)
  62                 return udp_sock_create6(net, cfg, sockp);
  63
  64         return -EPFNOSUPPORT;
  65 }
  66
  67 typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
  68 typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk,
  69                                              struct sk_buff *skb);
  70 typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
  71 typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk,
  72                                                     struct list_head *head,
  73                                                     struct sk_buff *skb);
  74 typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
  75                                          int nhoff);
  76
  77 struct udp_tunnel_sock_cfg {
  78         void *sk_user_data;     /* user data used by encap_rcv call back */
  79         /* Used for setting up udp_sock fields, see udp.h for details */
  80         __u8  encap_type;
  81         udp_tunnel_encap_rcv_t encap_rcv;
  82         udp_tunnel_encap_err_lookup_t encap_err_lookup;
  83         udp_tunnel_encap_destroy_t encap_destroy;
  84         udp_tunnel_gro_receive_t gro_receive;
  85         udp_tunnel_gro_complete_t gro_complete;
  86 };
  87
  88 /* Setup the given (UDP) sock to receive UDP encapsulated packets */
  89 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
  90                            struct udp_tunnel_sock_cfg *sock_cfg);
  91
  92 /* -- List of parsable UDP tunnel types --
  93  *
  94  * Adding to this list will result in serious debate.  The main issue is
  95  * that this list is essentially a list of workarounds for either poorly
  96  * designed tunnels, or poorly designed device offloads.
  97  *
  98  * The parsing supported via these types should really be used for Rx
  99  * traffic only as the network stack will have already inserted offsets for
 100  * the location of the headers in the skb.  In addition any ports that are
 101  * pushed should be kept within the namespace without leaking to other
 102  * devices such as VFs or other ports on the same device.
 103  *
 104  * It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the
 105  * need to use this for Rx checksum offload.  It should not be necessary to
 106  * call this function to perform Tx offloads on outgoing traffic.
 107  */
 108 enum udp_parsable_tunnel_type {
 109         UDP_TUNNEL_TYPE_VXLAN,          /* RFC 7348 */
 110         UDP_TUNNEL_TYPE_GENEVE,         /* draft-ietf-nvo3-geneve */
 111         UDP_TUNNEL_TYPE_VXLAN_GPE,      /* draft-ietf-nvo3-vxlan-gpe */
 112 };
 113
 114 struct udp_tunnel_info {
 115         unsigned short type;
 116         sa_family_t sa_family;
 117         __be16 port;
 118 };
 119
 120 /* Notify network devices of offloadable types */
 121 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
 122                              unsigned short type);
 123 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
 124                              unsigned short type);
 125 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type);
 126 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);
 127
 128 static inline void udp_tunnel_get_rx_info(struct net_device *dev)
 129 {
 130         ASSERT_RTNL();
 131         call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev);
 132 }
 133
 134 static inline void udp_tunnel_drop_rx_info(struct net_device *dev)
 135 {
 136         ASSERT_RTNL();
 137         call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev);
 138 }
 139
 140 /* Transmit the skb using UDP encapsulation. */
 141 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
 142                          __be32 src, __be32 dst, __u8 tos, __u8 ttl,
 143                          __be16 df, __be16 src_port, __be16 dst_port,
 144                          bool xnet, bool nocheck);
 145
 146 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
 147                          struct sk_buff *skb,
 148                          struct net_device *dev, struct in6_addr *saddr,
 149                          struct in6_addr *daddr,
 150                          __u8 prio, __u8 ttl, __be32 label,
 151                          __be16 src_port, __be16 dst_port, bool nocheck);
 152
 153 void udp_tunnel_sock_release(struct socket *sock);
 154
 155 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
 156                                     __be16 flags, __be64 tunnel_id,
 157                                     int md_size);
 158
 159 #ifdef CONFIG_INET
 160 static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
 161 {
 162         int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
 163
 164         return iptunnel_handle_offloads(skb, type);
 165 }
 166 #endif
 167
 168 static inline void udp_tunnel_encap_enable(struct socket *sock)
 169 {
 170         struct udp_sock *up = udp_sk(sock->sk);
 171
 172         if (up->encap_enabled)
 173                 return;
 174
 175         up->encap_enabled = 1;
 176 #if IS_ENABLED(CONFIG_IPV6)
 177         if (sock->sk->sk_family == PF_INET6)
 178                 ipv6_stub->udpv6_encap_enable();
 179         else
 180 #endif
 181                 udp_encap_enable();
 182 }
 183
 184 #endif