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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8024e028 TH |
2 | #ifndef __NET_UDP_TUNNEL_H |
3 | #define __NET_UDP_TUNNEL_H | |
4 | ||
6a93cc90 AZ |
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 | ||
8024e028 TH |
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; | |
da5095d0 | 33 | int bind_ifindex; |
8024e028 TH |
34 | unsigned int use_udp_checksums:1, |
35 | use_udp6_tx_checksums:1, | |
a43a9ef6 JB |
36 | use_udp6_rx_checksums:1, |
37 | ipv6_v6only:1; | |
8024e028 TH |
38 | }; |
39 | ||
fd384412 AZ |
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 | } | |
8024e028 | 66 | |
6a93cc90 | 67 | typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb); |
a36e185e SB |
68 | typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk, |
69 | struct sk_buff *skb); | |
6a93cc90 | 70 | typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk); |
d4546c25 DM |
71 | typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk, |
72 | struct list_head *head, | |
73 | struct sk_buff *skb); | |
38fd2af2 TH |
74 | typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb, |
75 | int nhoff); | |
6a93cc90 AZ |
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; | |
a36e185e | 82 | udp_tunnel_encap_err_lookup_t encap_err_lookup; |
6a93cc90 | 83 | udp_tunnel_encap_destroy_t encap_destroy; |
38fd2af2 TH |
84 | udp_tunnel_gro_receive_t gro_receive; |
85 | udp_tunnel_gro_complete_t gro_complete; | |
6a93cc90 AZ |
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 | ||
e7b3db5e AD |
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 */ | |
b9adcd69 | 111 | UDP_TUNNEL_TYPE_VXLAN_GPE, /* draft-ietf-nvo3-vxlan-gpe */ |
e7b3db5e AD |
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); | |
296d8ee3 SD |
123 | void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock, |
124 | unsigned short type); | |
e7b3db5e AD |
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 | ||
7c46a640 AD |
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 | ||
296d8ee3 SD |
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 | ||
6a93cc90 | 140 | /* Transmit the skb using UDP encapsulation. */ |
039f5062 PS |
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); | |
6a93cc90 AZ |
145 | |
146 | #if IS_ENABLED(CONFIG_IPV6) | |
79b16aad DM |
147 | int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, |
148 | struct sk_buff *skb, | |
d998f8ef TH |
149 | struct net_device *dev, struct in6_addr *saddr, |
150 | struct in6_addr *daddr, | |
13461144 DB |
151 | __u8 prio, __u8 ttl, __be32 label, |
152 | __be16 src_port, __be16 dst_port, bool nocheck); | |
6a93cc90 AZ |
153 | #endif |
154 | ||
155 | void udp_tunnel_sock_release(struct socket *sock); | |
156 | ||
c29a70d2 PS |
157 | struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family, |
158 | __be16 flags, __be64 tunnel_id, | |
159 | int md_size); | |
160 | ||
86a98057 | 161 | #ifdef CONFIG_INET |
aed069df | 162 | static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum) |
6a93cc90 AZ |
163 | { |
164 | int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
165 | ||
6fa79666 | 166 | return iptunnel_handle_offloads(skb, type); |
6a93cc90 | 167 | } |
86a98057 | 168 | #endif |
6a93cc90 AZ |
169 | |
170 | static inline void udp_tunnel_encap_enable(struct socket *sock) | |
171 | { | |
60fb9567 PA |
172 | struct udp_sock *up = udp_sk(sock->sk); |
173 | ||
174 | if (up->encap_enabled) | |
175 | return; | |
176 | ||
177 | up->encap_enabled = 1; | |
6a93cc90 AZ |
178 | #if IS_ENABLED(CONFIG_IPV6) |
179 | if (sock->sk->sk_family == PF_INET6) | |
180 | ipv6_stub->udpv6_encap_enable(); | |
181 | else | |
182 | #endif | |
183 | udp_encap_enable(); | |
184 | } | |
185 | ||
8024e028 | 186 | #endif |