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 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 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 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 } 66 67 typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb); 68 typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk, 69 struct sk_buff *skb); 70 typedef void (*udp_tunnel_encap_err_rcv_t)(struct sock *sk, 71 struct sk_buff *skb, int err, 72 __be16 port, u32 info, u8 *payload); 73 typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk); 74 typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk, 75 struct list_head *head, 76 struct sk_buff *skb); 77 typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb, 78 int nhoff); 79 80 struct 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 */ 93 void 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 */ 112 enum 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 }; 117 118 struct 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 */ 126 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock, 127 unsigned short type); 128 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock, 129 unsigned short type); 130 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type); 131 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type); 132 133 static 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 } 140 141 static 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. */ 150 void 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); 154 155 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk, 156 struct sk_buff *skb, 157 struct net_device *dev, 158 const struct in6_addr *saddr, 159 const struct in6_addr *daddr, 160 __u8 prio, __u8 ttl, __be32 label, 161 __be16 src_port, __be16 dst_port, bool nocheck); 162 163 void udp_tunnel_sock_release(struct socket *sock); 164 165 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family, 166 __be16 flags, __be64 tunnel_id, 167 int md_size); 168 169 #ifdef CONFIG_INET 170 static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum) 171 { 172 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 173 174 return iptunnel_handle_offloads(skb, type); 175 } 176 #endif 177 178 static inline void udp_tunnel_encap_enable(struct sock *sk) 179 { 180 if (udp_test_and_set_bit(ENCAP_ENABLED, sk)) 181 return; 182 183 #if IS_ENABLED(CONFIG_IPV6) 184 if (READ_ONCE(sk->sk_family) == PF_INET6) 185 ipv6_stub->udpv6_encap_enable(); 186 #endif 187 udp_encap_enable(); 188 } 189 190 #define UDP_TUNNEL_NIC_MAX_TABLES 4 191 192 enum udp_tunnel_nic_info_flags { 193 /* Device callbacks may sleep */ 194 UDP_TUNNEL_NIC_INFO_MAY_SLEEP = BIT(0), 195 /* Device only supports offloads when it's open, all ports 196 * will be removed before close and re-added after open. 197 */ 198 UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(1), 199 /* Device supports only IPv4 tunnels */ 200 UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(2), 201 /* Device has hard-coded the IANA VXLAN port (4789) as VXLAN. 202 * This port must not be counted towards n_entries of any table. 203 * Driver will not receive any callback associated with port 4789. 204 */ 205 UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(3), 206 }; 207 208 struct udp_tunnel_nic; 209 210 #define UDP_TUNNEL_NIC_MAX_SHARING_DEVICES (U16_MAX / 2) 211 212 struct udp_tunnel_nic_shared { 213 struct udp_tunnel_nic *udp_tunnel_nic_info; 214 215 struct list_head devices; 216 }; 217 218 struct udp_tunnel_nic_shared_node { 219 struct net_device *dev; 220 struct list_head list; 221 }; 222 223 /** 224 * struct udp_tunnel_nic_info - driver UDP tunnel offload information 225 * @set_port: callback for adding a new port 226 * @unset_port: callback for removing a port 227 * @sync_table: callback for syncing the entire port table at once 228 * @shared: reference to device global state (optional) 229 * @flags: device flags from enum udp_tunnel_nic_info_flags 230 * @tables: UDP port tables this device has 231 * @tables.n_entries: number of entries in this table 232 * @tables.tunnel_types: types of tunnels this table accepts 233 * 234 * Drivers are expected to provide either @set_port and @unset_port callbacks 235 * or the @sync_table callback. Callbacks are invoked with rtnl lock held. 236 * 237 * Devices which (misguidedly) share the UDP tunnel port table across multiple 238 * netdevs should allocate an instance of struct udp_tunnel_nic_shared and 239 * point @shared at it. 240 * There must never be more than %UDP_TUNNEL_NIC_MAX_SHARING_DEVICES devices 241 * sharing a table. 242 * 243 * Known limitations: 244 * - UDP tunnel port notifications are fundamentally best-effort - 245 * it is likely the driver will both see skbs which use a UDP tunnel port, 246 * while not being a tunneled skb, and tunnel skbs from other ports - 247 * drivers should only use these ports for non-critical RX-side offloads, 248 * e.g. the checksum offload; 249 * - none of the devices care about the socket family at present, so we don't 250 * track it. Please extend this code if you care. 251 */ 252 struct udp_tunnel_nic_info { 253 /* one-by-one */ 254 int (*set_port)(struct net_device *dev, 255 unsigned int table, unsigned int entry, 256 struct udp_tunnel_info *ti); 257 int (*unset_port)(struct net_device *dev, 258 unsigned int table, unsigned int entry, 259 struct udp_tunnel_info *ti); 260 261 /* all at once */ 262 int (*sync_table)(struct net_device *dev, unsigned int table); 263 264 struct udp_tunnel_nic_shared *shared; 265 266 unsigned int flags; 267 268 struct udp_tunnel_nic_table_info { 269 unsigned int n_entries; 270 unsigned int tunnel_types; 271 } tables[UDP_TUNNEL_NIC_MAX_TABLES]; 272 }; 273 274 /* UDP tunnel module dependencies 275 * 276 * Tunnel drivers are expected to have a hard dependency on the udp_tunnel 277 * module. NIC drivers are not, they just attach their 278 * struct udp_tunnel_nic_info to the netdev and wait for callbacks to come. 279 * Loading a tunnel driver will cause the udp_tunnel module to be loaded 280 * and only then will all the required state structures be allocated. 281 * Since we want a weak dependency from the drivers and the core to udp_tunnel 282 * we call things through the following stubs. 283 */ 284 struct udp_tunnel_nic_ops { 285 void (*get_port)(struct net_device *dev, unsigned int table, 286 unsigned int idx, struct udp_tunnel_info *ti); 287 void (*set_port_priv)(struct net_device *dev, unsigned int table, 288 unsigned int idx, u8 priv); 289 void (*add_port)(struct net_device *dev, struct udp_tunnel_info *ti); 290 void (*del_port)(struct net_device *dev, struct udp_tunnel_info *ti); 291 void (*reset_ntf)(struct net_device *dev); 292 293 size_t (*dump_size)(struct net_device *dev, unsigned int table); 294 int (*dump_write)(struct net_device *dev, unsigned int table, 295 struct sk_buff *skb); 296 }; 297 298 #ifdef CONFIG_INET 299 extern const struct udp_tunnel_nic_ops *udp_tunnel_nic_ops; 300 #else 301 #define udp_tunnel_nic_ops ((struct udp_tunnel_nic_ops *)NULL) 302 #endif 303 304 static inline void 305 udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table, 306 unsigned int idx, struct udp_tunnel_info *ti) 307 { 308 /* This helper is used from .sync_table, we indicate empty entries 309 * by zero'ed @ti. Drivers which need to know the details of a port 310 * when it gets deleted should use the .set_port / .unset_port 311 * callbacks. 312 * Zero out here, otherwise !CONFIG_INET causes uninitilized warnings. 313 */ 314 memset(ti, 0, sizeof(*ti)); 315 316 if (udp_tunnel_nic_ops) 317 udp_tunnel_nic_ops->get_port(dev, table, idx, ti); 318 } 319 320 static inline void 321 udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table, 322 unsigned int idx, u8 priv) 323 { 324 if (udp_tunnel_nic_ops) 325 udp_tunnel_nic_ops->set_port_priv(dev, table, idx, priv); 326 } 327 328 static inline void 329 udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti) 330 { 331 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) 332 return; 333 if (udp_tunnel_nic_ops) 334 udp_tunnel_nic_ops->add_port(dev, ti); 335 } 336 337 static inline void 338 udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti) 339 { 340 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) 341 return; 342 if (udp_tunnel_nic_ops) 343 udp_tunnel_nic_ops->del_port(dev, ti); 344 } 345 346 /** 347 * udp_tunnel_nic_reset_ntf() - device-originating reset notification 348 * @dev: network interface device structure 349 * 350 * Called by the driver to inform the core that the entire UDP tunnel port 351 * state has been lost, usually due to device reset. Core will assume device 352 * forgot all the ports and issue .set_port and .sync_table callbacks as 353 * necessary. 354 * 355 * This function must be called with rtnl lock held, and will issue all 356 * the callbacks before returning. 357 */ 358 static inline void udp_tunnel_nic_reset_ntf(struct net_device *dev) 359 { 360 if (udp_tunnel_nic_ops) 361 udp_tunnel_nic_ops->reset_ntf(dev); 362 } 363 364 static inline size_t 365 udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table) 366 { 367 if (!udp_tunnel_nic_ops) 368 return 0; 369 return udp_tunnel_nic_ops->dump_size(dev, table); 370 } 371 372 static inline int 373 udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table, 374 struct sk_buff *skb) 375 { 376 if (!udp_tunnel_nic_ops) 377 return 0; 378 return udp_tunnel_nic_ops->dump_write(dev, table, skb); 379 } 380 #endif 381