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TOMOYO Linux Cross Reference
Linux/include/net/udp_tunnel.h

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  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_notify_add_rx_port(struct socket *sock, unsigned short type);
119 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);
120 
121 static inline void udp_tunnel_get_rx_info(struct net_device *dev)
122 {
123         ASSERT_RTNL();
124         call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev);
125 }
126 
127 /* Transmit the skb using UDP encapsulation. */
128 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
129                          __be32 src, __be32 dst, __u8 tos, __u8 ttl,
130                          __be16 df, __be16 src_port, __be16 dst_port,
131                          bool xnet, bool nocheck);
132 
133 #if IS_ENABLED(CONFIG_IPV6)
134 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
135                          struct sk_buff *skb,
136                          struct net_device *dev, struct in6_addr *saddr,
137                          struct in6_addr *daddr,
138                          __u8 prio, __u8 ttl, __be32 label,
139                          __be16 src_port, __be16 dst_port, bool nocheck);
140 #endif
141 
142 void udp_tunnel_sock_release(struct socket *sock);
143 
144 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
145                                     __be16 flags, __be64 tunnel_id,
146                                     int md_size);
147 
148 #ifdef CONFIG_INET
149 static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
150 {
151         int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
152 
153         return iptunnel_handle_offloads(skb, type);
154 }
155 #endif
156 
157 static inline void udp_tunnel_encap_enable(struct socket *sock)
158 {
159 #if IS_ENABLED(CONFIG_IPV6)
160         if (sock->sk->sk_family == PF_INET6)
161                 ipv6_stub->udpv6_encap_enable();
162         else
163 #endif
164                 udp_encap_enable();
165 }
166 
167 #endif
168 

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