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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
13struct 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
40int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
41 struct socket **sockp);
42
43#if IS_ENABLED(CONFIG_IPV6)
44int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
45 struct socket **sockp);
46#else
47static 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
54static 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
67typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
68typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk,
69 struct sk_buff *skb);
70typedef void (*udp_tunnel_encap_err_rcv_t)(struct sock *sk,
71 struct sk_buff *skb, int err,
72 __be16 port, u32 info, u8 *payload);
73typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
74typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk,
75 struct list_head *head,
76 struct sk_buff *skb);
77typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
78 int nhoff);
79
80struct udp_tunnel_sock_cfg {
81 void *sk_user_data; /* user data used by encap_rcv call back */
82 /* Used for setting up udp_sock fields, see udp.h for details */
83 __u8 encap_type;
84 udp_tunnel_encap_rcv_t encap_rcv;
85 udp_tunnel_encap_err_lookup_t encap_err_lookup;
86 udp_tunnel_encap_err_rcv_t encap_err_rcv;
87 udp_tunnel_encap_destroy_t encap_destroy;
88 udp_tunnel_gro_receive_t gro_receive;
89 udp_tunnel_gro_complete_t gro_complete;
90};
91
92/* Setup the given (UDP) sock to receive UDP encapsulated packets */
93void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
94 struct udp_tunnel_sock_cfg *sock_cfg);
95
96/* -- List of parsable UDP tunnel types --
97 *
98 * Adding to this list will result in serious debate. The main issue is
99 * that this list is essentially a list of workarounds for either poorly
100 * designed tunnels, or poorly designed device offloads.
101 *
102 * The parsing supported via these types should really be used for Rx
103 * traffic only as the network stack will have already inserted offsets for
104 * the location of the headers in the skb. In addition any ports that are
105 * pushed should be kept within the namespace without leaking to other
106 * devices such as VFs or other ports on the same device.
107 *
108 * It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the
109 * need to use this for Rx checksum offload. It should not be necessary to
110 * call this function to perform Tx offloads on outgoing traffic.
111 */
112enum udp_parsable_tunnel_type {
113 UDP_TUNNEL_TYPE_VXLAN = BIT(0), /* RFC 7348 */
114 UDP_TUNNEL_TYPE_GENEVE = BIT(1), /* draft-ietf-nvo3-geneve */
115 UDP_TUNNEL_TYPE_VXLAN_GPE = BIT(2), /* draft-ietf-nvo3-vxlan-gpe */
116};
117
118struct udp_tunnel_info {
119 unsigned short type;
120 sa_family_t sa_family;
121 __be16 port;
122 u8 hw_priv;
123};
124
125/* Notify network devices of offloadable types */
126void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
127 unsigned short type);
128void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
129 unsigned short type);
130void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type);
131void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);
132
133static inline void udp_tunnel_get_rx_info(struct net_device *dev)
134{
135 ASSERT_RTNL();
136 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
137 return;
138 call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev);
139}
140
141static inline void udp_tunnel_drop_rx_info(struct net_device *dev)
142{
143 ASSERT_RTNL();
144 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
145 return;
146 call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev);
147}
148
149/* Transmit the skb using UDP encapsulation. */
150void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
151 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
152 __be16 df, __be16 src_port, __be16 dst_port,
153 bool xnet, bool nocheck);
154
155int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
156 struct sk_buff *skb,
157 struct net_device *dev, struct in6_addr *saddr,
158 struct in6_addr *daddr,
159 __u8 prio, __u8 ttl, __be32 label,
160 __be16 src_port, __be16 dst_port, bool nocheck);
161
162void udp_tunnel_sock_release(struct socket *sock);
163
164struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
165 __be16 flags, __be64 tunnel_id,
166 int md_size);
167
168#ifdef CONFIG_INET
169static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
170{
171 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
172
173 return iptunnel_handle_offloads(skb, type);
174}
175#endif
176
177static inline void udp_tunnel_encap_enable(struct socket *sock)
178{
179 struct udp_sock *up = udp_sk(sock->sk);
180
181 if (up->encap_enabled)
182 return;
183
184 up->encap_enabled = 1;
185#if IS_ENABLED(CONFIG_IPV6)
186 if (sock->sk->sk_family == PF_INET6)
187 ipv6_stub->udpv6_encap_enable();
188#endif
189 udp_encap_enable();
190}
191
192#define UDP_TUNNEL_NIC_MAX_TABLES 4
193
194enum udp_tunnel_nic_info_flags {
195 /* Device callbacks may sleep */
196 UDP_TUNNEL_NIC_INFO_MAY_SLEEP = BIT(0),
197 /* Device only supports offloads when it's open, all ports
198 * will be removed before close and re-added after open.
199 */
200 UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(1),
201 /* Device supports only IPv4 tunnels */
202 UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(2),
203 /* Device has hard-coded the IANA VXLAN port (4789) as VXLAN.
204 * This port must not be counted towards n_entries of any table.
205 * Driver will not receive any callback associated with port 4789.
206 */
207 UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(3),
208};
209
210struct udp_tunnel_nic;
211
212#define UDP_TUNNEL_NIC_MAX_SHARING_DEVICES (U16_MAX / 2)
213
214struct udp_tunnel_nic_shared {
215 struct udp_tunnel_nic *udp_tunnel_nic_info;
216
217 struct list_head devices;
218};
219
220struct udp_tunnel_nic_shared_node {
221 struct net_device *dev;
222 struct list_head list;
223};
224
225/**
226 * struct udp_tunnel_nic_info - driver UDP tunnel offload information
227 * @set_port: callback for adding a new port
228 * @unset_port: callback for removing a port
229 * @sync_table: callback for syncing the entire port table at once
230 * @shared: reference to device global state (optional)
231 * @flags: device flags from enum udp_tunnel_nic_info_flags
232 * @tables: UDP port tables this device has
233 * @tables.n_entries: number of entries in this table
234 * @tables.tunnel_types: types of tunnels this table accepts
235 *
236 * Drivers are expected to provide either @set_port and @unset_port callbacks
237 * or the @sync_table callback. Callbacks are invoked with rtnl lock held.
238 *
239 * Devices which (misguidedly) share the UDP tunnel port table across multiple
240 * netdevs should allocate an instance of struct udp_tunnel_nic_shared and
241 * point @shared at it.
242 * There must never be more than %UDP_TUNNEL_NIC_MAX_SHARING_DEVICES devices
243 * sharing a table.
244 *
245 * Known limitations:
246 * - UDP tunnel port notifications are fundamentally best-effort -
247 * it is likely the driver will both see skbs which use a UDP tunnel port,
248 * while not being a tunneled skb, and tunnel skbs from other ports -
249 * drivers should only use these ports for non-critical RX-side offloads,
250 * e.g. the checksum offload;
251 * - none of the devices care about the socket family at present, so we don't
252 * track it. Please extend this code if you care.
253 */
254struct udp_tunnel_nic_info {
255 /* one-by-one */
256 int (*set_port)(struct net_device *dev,
257 unsigned int table, unsigned int entry,
258 struct udp_tunnel_info *ti);
259 int (*unset_port)(struct net_device *dev,
260 unsigned int table, unsigned int entry,
261 struct udp_tunnel_info *ti);
262
263 /* all at once */
264 int (*sync_table)(struct net_device *dev, unsigned int table);
265
266 struct udp_tunnel_nic_shared *shared;
267
268 unsigned int flags;
269
270 struct udp_tunnel_nic_table_info {
271 unsigned int n_entries;
272 unsigned int tunnel_types;
273 } tables[UDP_TUNNEL_NIC_MAX_TABLES];
274};
275
276/* UDP tunnel module dependencies
277 *
278 * Tunnel drivers are expected to have a hard dependency on the udp_tunnel
279 * module. NIC drivers are not, they just attach their
280 * struct udp_tunnel_nic_info to the netdev and wait for callbacks to come.
281 * Loading a tunnel driver will cause the udp_tunnel module to be loaded
282 * and only then will all the required state structures be allocated.
283 * Since we want a weak dependency from the drivers and the core to udp_tunnel
284 * we call things through the following stubs.
285 */
286struct udp_tunnel_nic_ops {
287 void (*get_port)(struct net_device *dev, unsigned int table,
288 unsigned int idx, struct udp_tunnel_info *ti);
289 void (*set_port_priv)(struct net_device *dev, unsigned int table,
290 unsigned int idx, u8 priv);
291 void (*add_port)(struct net_device *dev, struct udp_tunnel_info *ti);
292 void (*del_port)(struct net_device *dev, struct udp_tunnel_info *ti);
293 void (*reset_ntf)(struct net_device *dev);
294
295 size_t (*dump_size)(struct net_device *dev, unsigned int table);
296 int (*dump_write)(struct net_device *dev, unsigned int table,
297 struct sk_buff *skb);
298};
299
300#ifdef CONFIG_INET
301extern const struct udp_tunnel_nic_ops *udp_tunnel_nic_ops;
302#else
303#define udp_tunnel_nic_ops ((struct udp_tunnel_nic_ops *)NULL)
304#endif
305
306static inline void
307udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table,
308 unsigned int idx, struct udp_tunnel_info *ti)
309{
310 /* This helper is used from .sync_table, we indicate empty entries
311 * by zero'ed @ti. Drivers which need to know the details of a port
312 * when it gets deleted should use the .set_port / .unset_port
313 * callbacks.
314 * Zero out here, otherwise !CONFIG_INET causes uninitilized warnings.
315 */
316 memset(ti, 0, sizeof(*ti));
317
318 if (udp_tunnel_nic_ops)
319 udp_tunnel_nic_ops->get_port(dev, table, idx, ti);
320}
321
322static inline void
323udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table,
324 unsigned int idx, u8 priv)
325{
326 if (udp_tunnel_nic_ops)
327 udp_tunnel_nic_ops->set_port_priv(dev, table, idx, priv);
328}
329
330static inline void
331udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti)
332{
333 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
334 return;
335 if (udp_tunnel_nic_ops)
336 udp_tunnel_nic_ops->add_port(dev, ti);
337}
338
339static inline void
340udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti)
341{
342 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
343 return;
344 if (udp_tunnel_nic_ops)
345 udp_tunnel_nic_ops->del_port(dev, ti);
346}
347
348/**
349 * udp_tunnel_nic_reset_ntf() - device-originating reset notification
350 * @dev: network interface device structure
351 *
352 * Called by the driver to inform the core that the entire UDP tunnel port
353 * state has been lost, usually due to device reset. Core will assume device
354 * forgot all the ports and issue .set_port and .sync_table callbacks as
355 * necessary.
356 *
357 * This function must be called with rtnl lock held, and will issue all
358 * the callbacks before returning.
359 */
360static inline void udp_tunnel_nic_reset_ntf(struct net_device *dev)
361{
362 if (udp_tunnel_nic_ops)
363 udp_tunnel_nic_ops->reset_ntf(dev);
364}
365
366static inline size_t
367udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table)
368{
369 if (!udp_tunnel_nic_ops)
370 return 0;
371 return udp_tunnel_nic_ops->dump_size(dev, table);
372}
373
374static inline int
375udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table,
376 struct sk_buff *skb)
377{
378 if (!udp_tunnel_nic_ops)
379 return 0;
380 return udp_tunnel_nic_ops->dump_write(dev, table, skb);
381}
382#endif