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