xref: /openbmc/linux/include/net/udp_tunnel.h (revision 0edbfea5)
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 /* Transmit the skb using UDP encapsulation. */
88 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
89 			 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
90 			 __be16 df, __be16 src_port, __be16 dst_port,
91 			 bool xnet, bool nocheck);
92 
93 #if IS_ENABLED(CONFIG_IPV6)
94 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
95 			 struct sk_buff *skb,
96 			 struct net_device *dev, struct in6_addr *saddr,
97 			 struct in6_addr *daddr,
98 			 __u8 prio, __u8 ttl, __be32 label,
99 			 __be16 src_port, __be16 dst_port, bool nocheck);
100 #endif
101 
102 void udp_tunnel_sock_release(struct socket *sock);
103 
104 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
105 				    __be16 flags, __be64 tunnel_id,
106 				    int md_size);
107 
108 static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
109 {
110 	int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
111 
112 	return iptunnel_handle_offloads(skb, type);
113 }
114 
115 static inline void udp_tunnel_encap_enable(struct socket *sock)
116 {
117 #if IS_ENABLED(CONFIG_IPV6)
118 	if (sock->sk->sk_family == PF_INET6)
119 		ipv6_stub->udpv6_encap_enable();
120 	else
121 #endif
122 		udp_encap_enable();
123 }
124 
125 #endif
126