include/net/vxlan.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NET_VXLAN_H
   3 #define __NET_VXLAN_H 1
   4
   5 #include <linux/if_vlan.h>
   6 #include <linux/rhashtable-types.h>
   7 #include <net/udp_tunnel.h>
   8 #include <net/dst_metadata.h>
   9 #include <net/rtnetlink.h>
  10 #include <net/switchdev.h>
  11 #include <net/nexthop.h>
  12
  13 #define IANA_VXLAN_UDP_PORT     4789
  14 #define IANA_VXLAN_GPE_UDP_PORT 4790
  15
  16 /* VXLAN protocol (RFC 7348) header:
  17  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  18  * |R|R|R|R|I|R|R|R|               Reserved                        |
  19  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  20  * |                VXLAN Network Identifier (VNI) |   Reserved    |
  21  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  22  *
  23  * I = VXLAN Network Identifier (VNI) present.
  24  */
  25 struct vxlanhdr {
  26         __be32 vx_flags;
  27         __be32 vx_vni;
  28 };
  29
  30 /* VXLAN header flags. */
  31 #define VXLAN_HF_VNI    cpu_to_be32(BIT(27))
  32
  33 #define VXLAN_N_VID     (1u << 24)
  34 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
  35 #define VXLAN_VNI_MASK  cpu_to_be32(VXLAN_VID_MASK << 8)
  36 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
  37
  38 #define VNI_HASH_BITS   10
  39 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  40 #define FDB_HASH_BITS   8
  41 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  42
  43 /* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
  44  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  45  * |R|R|R|R|I|R|R|R|R|R|C|              Reserved                   |
  46  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  47  * |           VXLAN Network Identifier (VNI)      |O| Csum start  |
  48  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  49  *
  50  * C = Remote checksum offload bit. When set indicates that the
  51  *     remote checksum offload data is present.
  52  *
  53  * O = Offset bit. Indicates the checksum offset relative to
  54  *     checksum start.
  55  *
  56  * Csum start = Checksum start divided by two.
  57  *
  58  * http://tools.ietf.org/html/draft-herbert-vxlan-rco
  59  */
  60
  61 /* VXLAN-RCO header flags. */
  62 #define VXLAN_HF_RCO    cpu_to_be32(BIT(21))
  63
  64 /* Remote checksum offload header option */
  65 #define VXLAN_RCO_MASK  cpu_to_be32(0x7f)  /* Last byte of vni field */
  66 #define VXLAN_RCO_UDP   cpu_to_be32(0x80)  /* Indicate UDP RCO (TCP when not set *) */
  67 #define VXLAN_RCO_SHIFT 1                  /* Left shift of start */
  68 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
  69 #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
  70
  71 /*
  72  * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
  73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  74  * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
  75  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  76  * |                VXLAN Network Identifier (VNI) |   Reserved    |
  77  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  78  *
  79  * G = Group Policy ID present.
  80  *
  81  * D = Don't Learn bit. When set, this bit indicates that the egress
  82  *     VTEP MUST NOT learn the source address of the encapsulated frame.
  83  *
  84  * A = Indicates that the group policy has already been applied to
  85  *     this packet. Policies MUST NOT be applied by devices when the
  86  *     A bit is set.
  87  *
  88  * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
  89  */
  90 struct vxlanhdr_gbp {
  91         u8      vx_flags;
  92 #ifdef __LITTLE_ENDIAN_BITFIELD
  93         u8      reserved_flags1:3,
  94                 policy_applied:1,
  95                 reserved_flags2:2,
  96                 dont_learn:1,
  97                 reserved_flags3:1;
  98 #elif defined(__BIG_ENDIAN_BITFIELD)
  99         u8      reserved_flags1:1,
 100                 dont_learn:1,
 101                 reserved_flags2:2,
 102                 policy_applied:1,
 103                 reserved_flags3:3;
 104 #else
 105 #error  "Please fix <asm/byteorder.h>"
 106 #endif
 107         __be16  policy_id;
 108         __be32  vx_vni;
 109 };
 110
 111 /* VXLAN-GBP header flags. */
 112 #define VXLAN_HF_GBP    cpu_to_be32(BIT(31))
 113
 114 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
 115
 116 /* skb->mark mapping
 117  *
 118  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 119  * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
 120  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 121  */
 122 #define VXLAN_GBP_DONT_LEARN            (BIT(6) << 16)
 123 #define VXLAN_GBP_POLICY_APPLIED        (BIT(3) << 16)
 124 #define VXLAN_GBP_ID_MASK               (0xFFFF)
 125
 126 #define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \
 127                         VXLAN_GBP_ID_MASK)
 128
 129 /*
 130  * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
 131  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 132  * |R|R|Ver|I|P|R|O|       Reserved                |Next Protocol  |
 133  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 134  * |                VXLAN Network Identifier (VNI) |   Reserved    |
 135  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 136  *
 137  * Ver = Version. Indicates VXLAN GPE protocol version.
 138  *
 139  * P = Next Protocol Bit. The P bit is set to indicate that the
 140  *     Next Protocol field is present.
 141  *
 142  * O = OAM Flag Bit. The O bit is set to indicate that the packet
 143  *     is an OAM packet.
 144  *
 145  * Next Protocol = This 8 bit field indicates the protocol header
 146  * immediately following the VXLAN GPE header.
 147  *
 148  * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
 149  */
 150
 151 struct vxlanhdr_gpe {
 152 #if defined(__LITTLE_ENDIAN_BITFIELD)
 153         u8      oam_flag:1,
 154                 reserved_flags1:1,
 155                 np_applied:1,
 156                 instance_applied:1,
 157                 version:2,
 158                 reserved_flags2:2;
 159 #elif defined(__BIG_ENDIAN_BITFIELD)
 160         u8      reserved_flags2:2,
 161                 version:2,
 162                 instance_applied:1,
 163                 np_applied:1,
 164                 reserved_flags1:1,
 165                 oam_flag:1;
 166 #endif
 167         u8      reserved_flags3;
 168         u8      reserved_flags4;
 169         u8      next_protocol;
 170         __be32  vx_vni;
 171 };
 172
 173 /* VXLAN-GPE header flags. */
 174 #define VXLAN_HF_VER    cpu_to_be32(BIT(29) | BIT(28))
 175 #define VXLAN_HF_NP     cpu_to_be32(BIT(26))
 176 #define VXLAN_HF_OAM    cpu_to_be32(BIT(24))
 177
 178 #define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
 179                              cpu_to_be32(0xff))
 180
 181 struct vxlan_metadata {
 182         u32             gbp;
 183 };
 184
 185 /* per UDP socket information */
 186 struct vxlan_sock {
 187         struct hlist_node hlist;
 188         struct socket    *sock;
 189         struct hlist_head vni_list[VNI_HASH_SIZE];
 190         refcount_t        refcnt;
 191         u32               flags;
 192 };
 193
 194 union vxlan_addr {
 195         struct sockaddr_in sin;
 196         struct sockaddr_in6 sin6;
 197         struct sockaddr sa;
 198 };
 199
 200 struct vxlan_rdst {
 201         union vxlan_addr         remote_ip;
 202         __be16                   remote_port;
 203         u8                       offloaded:1;
 204         __be32                   remote_vni;
 205         u32                      remote_ifindex;
 206         struct net_device        *remote_dev;
 207         struct list_head         list;
 208         struct rcu_head          rcu;
 209         struct dst_cache         dst_cache;
 210 };
 211
 212 struct vxlan_config {
 213         union vxlan_addr                remote_ip;
 214         union vxlan_addr                saddr;
 215         __be32                          vni;
 216         int                             remote_ifindex;
 217         int                             mtu;
 218         __be16                          dst_port;
 219         u16                             port_min;
 220         u16                             port_max;
 221         u8                              tos;
 222         u8                              ttl;
 223         __be32                          label;
 224         enum ifla_vxlan_label_policy    label_policy;
 225         u32                             flags;
 226         unsigned long                   age_interval;
 227         unsigned int                    addrmax;
 228         bool                            no_share;
 229         enum ifla_vxlan_df              df;
 230 };
 231
 232 enum {
 233         VXLAN_VNI_STATS_RX,
 234         VXLAN_VNI_STATS_RX_DROPS,
 235         VXLAN_VNI_STATS_RX_ERRORS,
 236         VXLAN_VNI_STATS_TX,
 237         VXLAN_VNI_STATS_TX_DROPS,
 238         VXLAN_VNI_STATS_TX_ERRORS,
 239 };
 240
 241 struct vxlan_vni_stats {
 242         u64 rx_packets;
 243         u64 rx_bytes;
 244         u64 rx_drops;
 245         u64 rx_errors;
 246         u64 tx_packets;
 247         u64 tx_bytes;
 248         u64 tx_drops;
 249         u64 tx_errors;
 250 };
 251
 252 struct vxlan_vni_stats_pcpu {
 253         struct vxlan_vni_stats stats;
 254         struct u64_stats_sync syncp;
 255 };
 256
 257 struct vxlan_dev_node {
 258         struct hlist_node hlist;
 259         struct vxlan_dev *vxlan;
 260 };
 261
 262 struct vxlan_vni_node {
 263         struct rhash_head vnode;
 264         struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
 265 #if IS_ENABLED(CONFIG_IPV6)
 266         struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
 267 #endif
 268         struct list_head vlist;
 269         __be32 vni;
 270         union vxlan_addr remote_ip; /* default remote ip for this vni */
 271         struct vxlan_vni_stats_pcpu __percpu *stats;
 272
 273         struct rcu_head rcu;
 274 };
 275
 276 struct vxlan_vni_group {
 277         struct rhashtable       vni_hash;
 278         struct list_head        vni_list;
 279         u32                     num_vnis;
 280 };
 281
 282 /* Pseudo network device */
 283 struct vxlan_dev {
 284         struct vxlan_dev_node hlist4;   /* vni hash table for IPv4 socket */
 285 #if IS_ENABLED(CONFIG_IPV6)
 286         struct vxlan_dev_node hlist6;   /* vni hash table for IPv6 socket */
 287 #endif
 288         struct list_head  next;         /* vxlan's per namespace list */
 289         struct vxlan_sock __rcu *vn4_sock;      /* listening socket for IPv4 */
 290 #if IS_ENABLED(CONFIG_IPV6)
 291         struct vxlan_sock __rcu *vn6_sock;      /* listening socket for IPv6 */
 292 #endif
 293         struct net_device *dev;
 294         struct net        *net;         /* netns for packet i/o */
 295         struct vxlan_rdst default_dst;  /* default destination */
 296
 297         struct timer_list age_timer;
 298         spinlock_t        hash_lock[FDB_HASH_SIZE];
 299         unsigned int      addrcnt;
 300         struct gro_cells  gro_cells;
 301
 302         struct vxlan_config     cfg;
 303
 304         struct vxlan_vni_group  __rcu *vnigrp;
 305
 306         struct hlist_head fdb_head[FDB_HASH_SIZE];
 307
 308         struct rhashtable mdb_tbl;
 309         struct hlist_head mdb_list;
 310         unsigned int mdb_seq;
 311 };
 312
 313 #define VXLAN_F_LEARN                   0x01
 314 #define VXLAN_F_PROXY                   0x02
 315 #define VXLAN_F_RSC                     0x04
 316 #define VXLAN_F_L2MISS                  0x08
 317 #define VXLAN_F_L3MISS                  0x10
 318 #define VXLAN_F_IPV6                    0x20
 319 #define VXLAN_F_UDP_ZERO_CSUM_TX        0x40
 320 #define VXLAN_F_UDP_ZERO_CSUM6_TX       0x80
 321 #define VXLAN_F_UDP_ZERO_CSUM6_RX       0x100
 322 #define VXLAN_F_REMCSUM_TX              0x200
 323 #define VXLAN_F_REMCSUM_RX              0x400
 324 #define VXLAN_F_GBP                     0x800
 325 #define VXLAN_F_REMCSUM_NOPARTIAL       0x1000
 326 #define VXLAN_F_COLLECT_METADATA        0x2000
 327 #define VXLAN_F_GPE                     0x4000
 328 #define VXLAN_F_IPV6_LINKLOCAL          0x8000
 329 #define VXLAN_F_TTL_INHERIT             0x10000
 330 #define VXLAN_F_VNIFILTER               0x20000
 331 #define VXLAN_F_MDB                     0x40000
 332 #define VXLAN_F_LOCALBYPASS             0x80000
 333
 334 /* Flags that are used in the receive path. These flags must match in
 335  * order for a socket to be shareable
 336  */
 337 #define VXLAN_F_RCV_FLAGS               (VXLAN_F_GBP |                  \
 338                                          VXLAN_F_GPE |                  \
 339                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
 340                                          VXLAN_F_REMCSUM_RX |           \
 341                                          VXLAN_F_REMCSUM_NOPARTIAL |    \
 342                                          VXLAN_F_COLLECT_METADATA |     \
 343                                          VXLAN_F_VNIFILTER)
 344
 345 /* Flags that can be set together with VXLAN_F_GPE. */
 346 #define VXLAN_F_ALLOWED_GPE             (VXLAN_F_GPE |                  \
 347                                          VXLAN_F_IPV6 |                 \
 348                                          VXLAN_F_IPV6_LINKLOCAL |       \
 349                                          VXLAN_F_UDP_ZERO_CSUM_TX |     \
 350                                          VXLAN_F_UDP_ZERO_CSUM6_TX |    \
 351                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
 352                                          VXLAN_F_COLLECT_METADATA  |    \
 353                                          VXLAN_F_VNIFILTER         |    \
 354                                          VXLAN_F_LOCALBYPASS)
 355
 356 struct net_device *vxlan_dev_create(struct net *net, const char *name,
 357                                     u8 name_assign_type, struct vxlan_config *conf);
 358
 359 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
 360                                                      netdev_features_t features)
 361 {
 362         u8 l4_hdr = 0;
 363
 364         if (!skb->encapsulation)
 365                 return features;
 366
 367         switch (vlan_get_protocol(skb)) {
 368         case htons(ETH_P_IP):
 369                 l4_hdr = ip_hdr(skb)->protocol;
 370                 break;
 371         case htons(ETH_P_IPV6):
 372                 l4_hdr = ipv6_hdr(skb)->nexthdr;
 373                 break;
 374         default:
 375                 return features;
 376         }
 377
 378         if ((l4_hdr == IPPROTO_UDP) &&
 379             (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
 380              skb->inner_protocol != htons(ETH_P_TEB) ||
 381              (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
 382               sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
 383              (skb->ip_summed != CHECKSUM_NONE &&
 384               !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
 385                 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 386
 387         return features;
 388 }
 389
 390 static inline int vxlan_headroom(u32 flags)
 391 {
 392         /* VXLAN:     IP4/6 header + UDP + VXLAN + Ethernet header */
 393         /* VXLAN-GPE: IP4/6 header + UDP + VXLAN */
 394         return (flags & VXLAN_F_IPV6 ? sizeof(struct ipv6hdr) :
 395                                        sizeof(struct iphdr)) +
 396                sizeof(struct udphdr) + sizeof(struct vxlanhdr) +
 397                (flags & VXLAN_F_GPE ? 0 : ETH_HLEN);
 398 }
 399
 400 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
 401 {
 402         return (struct vxlanhdr *)(udp_hdr(skb) + 1);
 403 }
 404
 405 static inline __be32 vxlan_vni(__be32 vni_field)
 406 {
 407 #if defined(__BIG_ENDIAN)
 408         return (__force __be32)((__force u32)vni_field >> 8);
 409 #else
 410         return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
 411 #endif
 412 }
 413
 414 static inline __be32 vxlan_vni_field(__be32 vni)
 415 {
 416 #if defined(__BIG_ENDIAN)
 417         return (__force __be32)((__force u32)vni << 8);
 418 #else
 419         return (__force __be32)((__force u32)vni >> 8);
 420 #endif
 421 }
 422
 423 static inline size_t vxlan_rco_start(__be32 vni_field)
 424 {
 425         return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 426 }
 427
 428 static inline size_t vxlan_rco_offset(__be32 vni_field)
 429 {
 430         return (vni_field & VXLAN_RCO_UDP) ?
 431                 offsetof(struct udphdr, check) :
 432                 offsetof(struct tcphdr, check);
 433 }
 434
 435 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
 436 {
 437         __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
 438
 439         if (offset == offsetof(struct udphdr, check))
 440                 vni_field |= VXLAN_RCO_UDP;
 441         return vni_field;
 442 }
 443
 444 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
 445 {
 446         return vs->sock->sk->sk_family;
 447 }
 448
 449 #if IS_ENABLED(CONFIG_IPV6)
 450
 451 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 452 {
 453         if (ipa->sa.sa_family == AF_INET6)
 454                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 455         else
 456                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 457 }
 458
 459 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 460 {
 461         if (ipa->sa.sa_family == AF_INET6)
 462                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 463         else
 464                 return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
 465 }
 466
 467 #else /* !IS_ENABLED(CONFIG_IPV6) */
 468
 469 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 470 {
 471         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 472 }
 473
 474 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 475 {
 476         return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
 477 }
 478
 479 #endif /* IS_ENABLED(CONFIG_IPV6) */
 480
 481 static inline bool netif_is_vxlan(const struct net_device *dev)
 482 {
 483         return dev->rtnl_link_ops &&
 484                !strcmp(dev->rtnl_link_ops->kind, "vxlan");
 485 }
 486
 487 struct switchdev_notifier_vxlan_fdb_info {
 488         struct switchdev_notifier_info info; /* must be first */
 489         union vxlan_addr remote_ip;
 490         __be16 remote_port;
 491         __be32 remote_vni;
 492         u32 remote_ifindex;
 493         u8 eth_addr[ETH_ALEN];
 494         __be32 vni;
 495         bool offloaded;
 496         bool added_by_user;
 497 };
 498
 499 #if IS_ENABLED(CONFIG_VXLAN)
 500 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 501                       struct switchdev_notifier_vxlan_fdb_info *fdb_info);
 502 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 503                      struct notifier_block *nb,
 504                      struct netlink_ext_ack *extack);
 505 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni);
 506
 507 #else
 508 static inline int
 509 vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 510                   struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 511 {
 512         return -ENOENT;
 513 }
 514
 515 static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 516                                    struct notifier_block *nb,
 517                                    struct netlink_ext_ack *extack)
 518 {
 519         return -EOPNOTSUPP;
 520 }
 521
 522 static inline void
 523 vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 524 {
 525 }
 526 #endif
 527
 528 static inline void vxlan_flag_attr_error(int attrtype,
 529                                          struct netlink_ext_ack *extack)
 530 {
 531 #define VXLAN_FLAG(flg) \
 532         case IFLA_VXLAN_##flg: \
 533                 NL_SET_ERR_MSG_MOD(extack, \
 534                                    "cannot change " #flg " flag"); \
 535                 break
 536         switch (attrtype) {
 537         VXLAN_FLAG(TTL_INHERIT);
 538         VXLAN_FLAG(LEARNING);
 539         VXLAN_FLAG(PROXY);
 540         VXLAN_FLAG(RSC);
 541         VXLAN_FLAG(L2MISS);
 542         VXLAN_FLAG(L3MISS);
 543         VXLAN_FLAG(COLLECT_METADATA);
 544         VXLAN_FLAG(UDP_ZERO_CSUM6_TX);
 545         VXLAN_FLAG(UDP_ZERO_CSUM6_RX);
 546         VXLAN_FLAG(REMCSUM_TX);
 547         VXLAN_FLAG(REMCSUM_RX);
 548         VXLAN_FLAG(GBP);
 549         VXLAN_FLAG(GPE);
 550         VXLAN_FLAG(REMCSUM_NOPARTIAL);
 551         default:
 552                 NL_SET_ERR_MSG_MOD(extack, \
 553                                    "cannot change flag");
 554                 break;
 555         }
 556 #undef VXLAN_FLAG
 557 }
 558
 559 static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
 560                                             u32 hash,
 561                                             struct vxlan_rdst *rdst)
 562 {
 563         struct fib_nh_common *nhc;
 564
 565         nhc = nexthop_path_fdb_result(nh, hash >> 1);
 566         if (unlikely(!nhc))
 567                 return false;
 568
 569         switch (nhc->nhc_gw_family) {
 570         case AF_INET:
 571                 rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
 572                 rdst->remote_ip.sa.sa_family = AF_INET;
 573                 break;
 574         case AF_INET6:
 575                 rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
 576                 rdst->remote_ip.sa.sa_family = AF_INET6;
 577                 break;
 578         }
 579
 580         return true;
 581 }
 582
 583 static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md)
 584 {
 585         struct vxlanhdr_gbp *gbp;
 586
 587         if (!md->gbp)
 588                 return;
 589
 590         gbp = (struct vxlanhdr_gbp *)vxh;
 591         vxh->vx_flags |= VXLAN_HF_GBP;
 592
 593         if (md->gbp & VXLAN_GBP_DONT_LEARN)
 594                 gbp->dont_learn = 1;
 595
 596         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
 597                 gbp->policy_applied = 1;
 598
 599         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
 600 }
 601
 602 #endif