1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * VXLAN: Virtual eXtensible Local Area Network
   4 *
   5 * Copyright (c) 2012-2013 Vyatta Inc.
   6 */
   7
   8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10#include <linux/kernel.h>
  11#include <linux/module.h>
  12#include <linux/errno.h>
  13#include <linux/slab.h>
  14#include <linux/udp.h>
  15#include <linux/igmp.h>
  16#include <linux/if_ether.h>
  17#include <linux/ethtool.h>
  18#include <net/arp.h>
  19#include <net/ndisc.h>
  20#include <net/gro.h>
  21#include <net/ipv6_stubs.h>
  22#include <net/ip.h>
  23#include <net/icmp.h>
  24#include <net/rtnetlink.h>
  25#include <net/inet_ecn.h>
  26#include <net/net_namespace.h>
  27#include <net/netns/generic.h>
  28#include <net/tun_proto.h>
  29#include <net/vxlan.h>
  30#include <net/nexthop.h>
  31
  32#if IS_ENABLED(CONFIG_IPV6)
  33#include <net/ip6_tunnel.h>
  34#include <net/ip6_checksum.h>
  35#endif
  36
  37#include "vxlan_private.h"
  38
  39#define VXLAN_VERSION	"0.1"
  40
  41#define FDB_AGE_DEFAULT 300 /* 5 min */
  42#define FDB_AGE_INTERVAL (10 * HZ)	/* rescan interval */
  43
  44/* UDP port for VXLAN traffic.
  45 * The IANA assigned port is 4789, but the Linux default is 8472
  46 * for compatibility with early adopters.
  47 */
  48static unsigned short vxlan_port __read_mostly = 8472;
  49module_param_named(udp_port, vxlan_port, ushort, 0444);
  50MODULE_PARM_DESC(udp_port, "Destination UDP port");
  51
  52static bool log_ecn_error = true;
  53module_param(log_ecn_error, bool, 0644);
  54MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  55
  56unsigned int vxlan_net_id;
  57
  58const u8 all_zeros_mac[ETH_ALEN + 2];
  59static struct rtnl_link_ops vxlan_link_ops;
  60
  61static int vxlan_sock_add(struct vxlan_dev *vxlan);
  62
  63static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  64
  65/* salt for hash table */
  66static u32 vxlan_salt __read_mostly;
  67
  68static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  69{
  70	return vs->flags & VXLAN_F_COLLECT_METADATA ||
  71	       ip_tunnel_collect_metadata();
  72}
  73
  74/* Find VXLAN socket based on network namespace, address family, UDP port,
  75 * enabled unshareable flags and socket device binding (see l3mdev with
  76 * non-default VRF).
  77 */
  78static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
  79					  __be16 port, u32 flags, int ifindex)
  80{
  81	struct vxlan_sock *vs;
  82
  83	flags &= VXLAN_F_RCV_FLAGS;
  84
  85	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
  86		if (inet_sk(vs->sock->sk)->inet_sport == port &&
  87		    vxlan_get_sk_family(vs) == family &&
  88		    vs->flags == flags &&
  89		    vs->sock->sk->sk_bound_dev_if == ifindex)
  90			return vs;
  91	}
  92	return NULL;
  93}
  94
  95static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs,
  96					   int ifindex, __be32 vni,
  97					   struct vxlan_vni_node **vninode)
  98{
  99	struct vxlan_vni_node *vnode;
 100	struct vxlan_dev_node *node;
 101
 102	/* For flow based devices, map all packets to VNI 0 */
 103	if (vs->flags & VXLAN_F_COLLECT_METADATA &&
 104	    !(vs->flags & VXLAN_F_VNIFILTER))
 105		vni = 0;
 106
 107	hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 108		if (!node->vxlan)
 109			continue;
 110		vnode = NULL;
 111		if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
 112			vnode = vxlan_vnifilter_lookup(node->vxlan, vni);
 113			if (!vnode)
 114				continue;
 115		} else if (node->vxlan->default_dst.remote_vni != vni) {
 116			continue;
 117		}
 118
 119		if (IS_ENABLED(CONFIG_IPV6)) {
 120			const struct vxlan_config *cfg = &node->vxlan->cfg;
 121
 122			if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 123			    cfg->remote_ifindex != ifindex)
 124				continue;
 125		}
 126
 127		if (vninode)
 128			*vninode = vnode;
 129		return node->vxlan;
 130	}
 131
 132	return NULL;
 133}
 134
 135/* Look up VNI in a per net namespace table */
 136static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 137					__be32 vni, sa_family_t family,
 138					__be16 port, u32 flags)
 139{
 140	struct vxlan_sock *vs;
 141
 142	vs = vxlan_find_sock(net, family, port, flags, ifindex);
 143	if (!vs)
 144		return NULL;
 145
 146	return vxlan_vs_find_vni(vs, ifindex, vni, NULL);
 147}
 148
 149/* Fill in neighbour message in skbuff. */
 150static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 151			  const struct vxlan_fdb *fdb,
 152			  u32 portid, u32 seq, int type, unsigned int flags,
 153			  const struct vxlan_rdst *rdst)
 154{
 155	unsigned long now = jiffies;
 156	struct nda_cacheinfo ci;
 157	bool send_ip, send_eth;
 158	struct nlmsghdr *nlh;
 159	struct nexthop *nh;
 160	struct ndmsg *ndm;
 161	int nh_family;
 162	u32 nh_id;
 163
 164	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 165	if (nlh == NULL)
 166		return -EMSGSIZE;
 167
 168	ndm = nlmsg_data(nlh);
 169	memset(ndm, 0, sizeof(*ndm));
 170
 171	send_eth = send_ip = true;
 172
 173	rcu_read_lock();
 174	nh = rcu_dereference(fdb->nh);
 175	if (nh) {
 176		nh_family = nexthop_get_family(nh);
 177		nh_id = nh->id;
 178	}
 179	rcu_read_unlock();
 180
 181	if (type == RTM_GETNEIGH) {
 182		if (rdst) {
 183			send_ip = !vxlan_addr_any(&rdst->remote_ip);
 184			ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 185		} else if (nh) {
 186			ndm->ndm_family = nh_family;
 187		}
 188		send_eth = !is_zero_ether_addr(fdb->eth_addr);
 189	} else
 190		ndm->ndm_family	= AF_BRIDGE;
 191	ndm->ndm_state = fdb->state;
 192	ndm->ndm_ifindex = vxlan->dev->ifindex;
 193	ndm->ndm_flags = fdb->flags;
 194	if (rdst && rdst->offloaded)
 195		ndm->ndm_flags |= NTF_OFFLOADED;
 196	ndm->ndm_type = RTN_UNICAST;
 197
 198	if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 199	    nla_put_s32(skb, NDA_LINK_NETNSID,
 200			peernet2id(dev_net(vxlan->dev), vxlan->net)))
 201		goto nla_put_failure;
 202
 203	if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 204		goto nla_put_failure;
 205	if (nh) {
 206		if (nla_put_u32(skb, NDA_NH_ID, nh_id))
 207			goto nla_put_failure;
 208	} else if (rdst) {
 209		if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
 210						  &rdst->remote_ip))
 211			goto nla_put_failure;
 212
 213		if (rdst->remote_port &&
 214		    rdst->remote_port != vxlan->cfg.dst_port &&
 215		    nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 216			goto nla_put_failure;
 217		if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 218		    nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 219			goto nla_put_failure;
 220		if (rdst->remote_ifindex &&
 221		    nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 222			goto nla_put_failure;
 223	}
 224
 225	if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 226	    nla_put_u32(skb, NDA_SRC_VNI,
 227			be32_to_cpu(fdb->vni)))
 228		goto nla_put_failure;
 229
 230	ci.ndm_used	 = jiffies_to_clock_t(now - fdb->used);
 231	ci.ndm_confirmed = 0;
 232	ci.ndm_updated	 = jiffies_to_clock_t(now - fdb->updated);
 233	ci.ndm_refcnt	 = 0;
 234
 235	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 236		goto nla_put_failure;
 237
 238	nlmsg_end(skb, nlh);
 239	return 0;
 240
 241nla_put_failure:
 242	nlmsg_cancel(skb, nlh);
 243	return -EMSGSIZE;
 244}
 245
 246static inline size_t vxlan_nlmsg_size(void)
 247{
 248	return NLMSG_ALIGN(sizeof(struct ndmsg))
 249		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 250		+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 251		+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
 252		+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
 253		+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 254		+ nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 255		+ nla_total_size(sizeof(struct nda_cacheinfo));
 256}
 257
 258static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 259			       struct vxlan_rdst *rd, int type)
 260{
 261	struct net *net = dev_net(vxlan->dev);
 262	struct sk_buff *skb;
 263	int err = -ENOBUFS;
 264
 265	skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 266	if (skb == NULL)
 267		goto errout;
 268
 269	err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 270	if (err < 0) {
 271		/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 272		WARN_ON(err == -EMSGSIZE);
 273		kfree_skb(skb);
 274		goto errout;
 275	}
 276
 277	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 278	return;
 279errout:
 280	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 
 281}
 282
 283static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 284			    const struct vxlan_fdb *fdb,
 285			    const struct vxlan_rdst *rd,
 286			    struct netlink_ext_ack *extack,
 287			    struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 288{
 289	fdb_info->info.dev = vxlan->dev;
 290	fdb_info->info.extack = extack;
 291	fdb_info->remote_ip = rd->remote_ip;
 292	fdb_info->remote_port = rd->remote_port;
 293	fdb_info->remote_vni = rd->remote_vni;
 294	fdb_info->remote_ifindex = rd->remote_ifindex;
 295	memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 296	fdb_info->vni = fdb->vni;
 297	fdb_info->offloaded = rd->offloaded;
 298	fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 299}
 300
 301static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 302					      struct vxlan_fdb *fdb,
 303					      struct vxlan_rdst *rd,
 304					      bool adding,
 305					      struct netlink_ext_ack *extack)
 306{
 307	struct switchdev_notifier_vxlan_fdb_info info;
 308	enum switchdev_notifier_type notifier_type;
 309	int ret;
 310
 311	if (WARN_ON(!rd))
 312		return 0;
 313
 314	notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 315			       : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 316	vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 317	ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 318				       &info.info, extack);
 319	return notifier_to_errno(ret);
 320}
 321
 322static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 323			    struct vxlan_rdst *rd, int type, bool swdev_notify,
 324			    struct netlink_ext_ack *extack)
 325{
 326	int err;
 327
 328	if (swdev_notify && rd) {
 329		switch (type) {
 330		case RTM_NEWNEIGH:
 331			err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 332								 true, extack);
 333			if (err)
 334				return err;
 335			break;
 336		case RTM_DELNEIGH:
 337			vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 338							   false, extack);
 339			break;
 340		}
 341	}
 342
 343	__vxlan_fdb_notify(vxlan, fdb, rd, type);
 344	return 0;
 345}
 346
 347static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 348{
 349	struct vxlan_dev *vxlan = netdev_priv(dev);
 350	struct vxlan_fdb f = {
 351		.state = NUD_STALE,
 352	};
 353	struct vxlan_rdst remote = {
 354		.remote_ip = *ipa, /* goes to NDA_DST */
 355		.remote_vni = cpu_to_be32(VXLAN_N_VID),
 356	};
 357
 358	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 359}
 360
 361static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 362{
 363	struct vxlan_fdb f = {
 364		.state = NUD_STALE,
 365	};
 366	struct vxlan_rdst remote = { };
 367
 368	memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 369
 370	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 371}
 372
 373/* Hash Ethernet address */
 374static u32 eth_hash(const unsigned char *addr)
 375{
 376	u64 value = get_unaligned((u64 *)addr);
 377
 378	/* only want 6 bytes */
 379#ifdef __BIG_ENDIAN
 380	value >>= 16;
 381#else
 382	value <<= 16;
 383#endif
 384	return hash_64(value, FDB_HASH_BITS);
 385}
 386
 387u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 388{
 389	/* use 1 byte of OUI and 3 bytes of NIC */
 390	u32 key = get_unaligned((u32 *)(addr + 2));
 391
 392	return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 393}
 394
 395u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 396{
 397	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 398		return eth_vni_hash(mac, vni);
 399	else
 400		return eth_hash(mac);
 401}
 402
 403/* Hash chain to use given mac address */
 404static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 405						const u8 *mac, __be32 vni)
 406{
 407	return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 408}
 409
 410/* Look up Ethernet address in forwarding table */
 411static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 412					  const u8 *mac, __be32 vni)
 413{
 414	struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 415	struct vxlan_fdb *f;
 416
 417	hlist_for_each_entry_rcu(f, head, hlist) {
 418		if (ether_addr_equal(mac, f->eth_addr)) {
 419			if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 420				if (vni == f->vni)
 421					return f;
 422			} else {
 423				return f;
 424			}
 425		}
 426	}
 427
 428	return NULL;
 429}
 430
 431static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 432					const u8 *mac, __be32 vni)
 433{
 434	struct vxlan_fdb *f;
 435
 436	f = __vxlan_find_mac(vxlan, mac, vni);
 437	if (f && f->used != jiffies)
 438		f->used = jiffies;
 439
 440	return f;
 441}
 442
 443/* caller should hold vxlan->hash_lock */
 444static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 445					      union vxlan_addr *ip, __be16 port,
 446					      __be32 vni, __u32 ifindex)
 447{
 448	struct vxlan_rdst *rd;
 449
 450	list_for_each_entry(rd, &f->remotes, list) {
 451		if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 452		    rd->remote_port == port &&
 453		    rd->remote_vni == vni &&
 454		    rd->remote_ifindex == ifindex)
 455			return rd;
 456	}
 457
 458	return NULL;
 459}
 460
 461int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 462		      struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 463{
 464	struct vxlan_dev *vxlan = netdev_priv(dev);
 465	u8 eth_addr[ETH_ALEN + 2] = { 0 };
 466	struct vxlan_rdst *rdst;
 467	struct vxlan_fdb *f;
 468	int rc = 0;
 469
 470	if (is_multicast_ether_addr(mac) ||
 471	    is_zero_ether_addr(mac))
 472		return -EINVAL;
 473
 474	ether_addr_copy(eth_addr, mac);
 475
 476	rcu_read_lock();
 477
 478	f = __vxlan_find_mac(vxlan, eth_addr, vni);
 479	if (!f) {
 480		rc = -ENOENT;
 481		goto out;
 482	}
 483
 484	rdst = first_remote_rcu(f);
 485	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 486
 487out:
 488	rcu_read_unlock();
 489	return rc;
 490}
 491EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 492
 493static int vxlan_fdb_notify_one(struct notifier_block *nb,
 494				const struct vxlan_dev *vxlan,
 495				const struct vxlan_fdb *f,
 496				const struct vxlan_rdst *rdst,
 497				struct netlink_ext_ack *extack)
 498{
 499	struct switchdev_notifier_vxlan_fdb_info fdb_info;
 500	int rc;
 501
 502	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 503	rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 504			       &fdb_info);
 505	return notifier_to_errno(rc);
 506}
 507
 508int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 509		     struct notifier_block *nb,
 510		     struct netlink_ext_ack *extack)
 511{
 512	struct vxlan_dev *vxlan;
 513	struct vxlan_rdst *rdst;
 514	struct vxlan_fdb *f;
 515	unsigned int h;
 516	int rc = 0;
 517
 518	if (!netif_is_vxlan(dev))
 519		return -EINVAL;
 520	vxlan = netdev_priv(dev);
 521
 522	for (h = 0; h < FDB_HASH_SIZE; ++h) {
 523		spin_lock_bh(&vxlan->hash_lock[h]);
 524		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 525			if (f->vni == vni) {
 526				list_for_each_entry(rdst, &f->remotes, list) {
 527					rc = vxlan_fdb_notify_one(nb, vxlan,
 528								  f, rdst,
 529								  extack);
 530					if (rc)
 531						goto unlock;
 532				}
 533			}
 534		}
 535		spin_unlock_bh(&vxlan->hash_lock[h]);
 536	}
 537	return 0;
 538
 539unlock:
 540	spin_unlock_bh(&vxlan->hash_lock[h]);
 541	return rc;
 542}
 543EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 544
 545void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 546{
 547	struct vxlan_dev *vxlan;
 548	struct vxlan_rdst *rdst;
 549	struct vxlan_fdb *f;
 550	unsigned int h;
 551
 552	if (!netif_is_vxlan(dev))
 553		return;
 554	vxlan = netdev_priv(dev);
 555
 556	for (h = 0; h < FDB_HASH_SIZE; ++h) {
 557		spin_lock_bh(&vxlan->hash_lock[h]);
 558		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 559			if (f->vni == vni)
 560				list_for_each_entry(rdst, &f->remotes, list)
 561					rdst->offloaded = false;
 562		spin_unlock_bh(&vxlan->hash_lock[h]);
 563	}
 564
 565}
 566EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 567
 568/* Replace destination of unicast mac */
 569static int vxlan_fdb_replace(struct vxlan_fdb *f,
 570			     union vxlan_addr *ip, __be16 port, __be32 vni,
 571			     __u32 ifindex, struct vxlan_rdst *oldrd)
 572{
 573	struct vxlan_rdst *rd;
 574
 575	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 576	if (rd)
 577		return 0;
 578
 579	rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 580	if (!rd)
 581		return 0;
 582
 583	*oldrd = *rd;
 584	dst_cache_reset(&rd->dst_cache);
 585	rd->remote_ip = *ip;
 586	rd->remote_port = port;
 587	rd->remote_vni = vni;
 588	rd->remote_ifindex = ifindex;
 589	rd->offloaded = false;
 590	return 1;
 591}
 592
 593/* Add/update destinations for multicast */
 594static int vxlan_fdb_append(struct vxlan_fdb *f,
 595			    union vxlan_addr *ip, __be16 port, __be32 vni,
 596			    __u32 ifindex, struct vxlan_rdst **rdp)
 597{
 598	struct vxlan_rdst *rd;
 599
 600	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 601	if (rd)
 602		return 0;
 603
 604	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 605	if (rd == NULL)
 606		return -ENOMEM;
 607
 608	if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 609		kfree(rd);
 610		return -ENOMEM;
 611	}
 612
 613	rd->remote_ip = *ip;
 614	rd->remote_port = port;
 615	rd->offloaded = false;
 616	rd->remote_vni = vni;
 617	rd->remote_ifindex = ifindex;
 618
 619	list_add_tail_rcu(&rd->list, &f->remotes);
 620
 621	*rdp = rd;
 622	return 1;
 623}
 624
 625static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol)
 626{
 627	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr;
 628
 629	/* Need to have Next Protocol set for interfaces in GPE mode. */
 630	if (!gpe->np_applied)
 631		return false;
 632	/* "The initial version is 0. If a receiver does not support the
 633	 * version indicated it MUST drop the packet.
 634	 */
 635	if (gpe->version != 0)
 636		return false;
 637	/* "When the O bit is set to 1, the packet is an OAM packet and OAM
 638	 * processing MUST occur." However, we don't implement OAM
 639	 * processing, thus drop the packet.
 640	 */
 641	if (gpe->oam_flag)
 642		return false;
 643
 644	*protocol = tun_p_to_eth_p(gpe->next_protocol);
 645	if (!*protocol)
 646		return false;
 647
 648	return true;
 649}
 650
 651static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 652					  unsigned int off,
 653					  struct vxlanhdr *vh, size_t hdrlen,
 654					  __be32 vni_field,
 655					  struct gro_remcsum *grc,
 656					  bool nopartial)
 657{
 658	size_t start, offset;
 659
 660	if (skb->remcsum_offload)
 661		return vh;
 662
 663	if (!NAPI_GRO_CB(skb)->csum_valid)
 664		return NULL;
 665
 666	start = vxlan_rco_start(vni_field);
 667	offset = start + vxlan_rco_offset(vni_field);
 668
 669	vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 670				     start, offset, grc, nopartial);
 671
 672	skb->remcsum_offload = 1;
 673
 674	return vh;
 675}
 676
 677static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk,
 678						  struct list_head *head,
 679						  struct sk_buff *skb,
 680						  struct gro_remcsum *grc)
 681{
 682	struct sk_buff *p;
 683	struct vxlanhdr *vh, *vh2;
 684	unsigned int hlen, off_vx;
 685	struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 686	__be32 flags;
 687
 688	skb_gro_remcsum_init(grc);
 689
 690	off_vx = skb_gro_offset(skb);
 691	hlen = off_vx + sizeof(*vh);
 692	vh = skb_gro_header(skb, hlen, off_vx);
 693	if (unlikely(!vh))
 694		return NULL;
 695
 696	skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 697
 698	flags = vh->vx_flags;
 699
 700	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 701		vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 702				       vh->vx_vni, grc,
 703				       !!(vs->flags &
 704					  VXLAN_F_REMCSUM_NOPARTIAL));
 705
 706		if (!vh)
 707			return NULL;
 708	}
 709
 710	skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 711
 712	list_for_each_entry(p, head, list) {
 713		if (!NAPI_GRO_CB(p)->same_flow)
 714			continue;
 715
 716		vh2 = (struct vxlanhdr *)(p->data + off_vx);
 717		if (vh->vx_flags != vh2->vx_flags ||
 718		    vh->vx_vni != vh2->vx_vni) {
 719			NAPI_GRO_CB(p)->same_flow = 0;
 720			continue;
 721		}
 722	}
 723
 724	return vh;
 725}
 726
 727static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 728					 struct list_head *head,
 729					 struct sk_buff *skb)
 730{
 731	struct sk_buff *pp = NULL;
 732	struct gro_remcsum grc;
 733	int flush = 1;
 734
 735	if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) {
 736		pp = call_gro_receive(eth_gro_receive, head, skb);
 737		flush = 0;
 738	}
 739	skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 740	return pp;
 741}
 742
 743static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk,
 744					     struct list_head *head,
 745					     struct sk_buff *skb)
 746{
 747	const struct packet_offload *ptype;
 748	struct sk_buff *pp = NULL;
 749	struct gro_remcsum grc;
 750	struct vxlanhdr *vh;
 751	__be16 protocol;
 752	int flush = 1;
 753
 754	vh = vxlan_gro_prepare_receive(sk, head, skb, &grc);
 755	if (vh) {
 756		if (!vxlan_parse_gpe_proto(vh, &protocol))
 757			goto out;
 758		ptype = gro_find_receive_by_type(protocol);
 759		if (!ptype)
 760			goto out;
 761		pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 762		flush = 0;
 763	}
 764out:
 765	skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 766	return pp;
 767}
 768
 769static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 770{
 771	/* Sets 'skb->inner_mac_header' since we are always called with
 772	 * 'skb->encapsulation' set.
 773	 */
 774	return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 775}
 776
 777static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 778{
 779	struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff);
 780	const struct packet_offload *ptype;
 781	int err = -ENOSYS;
 782	__be16 protocol;
 783
 784	if (!vxlan_parse_gpe_proto(vh, &protocol))
 785		return err;
 786	ptype = gro_find_complete_by_type(protocol);
 787	if (ptype)
 788		err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 789	return err;
 790}
 791
 792static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
 793					 __u16 state, __be32 src_vni,
 794					 __u16 ndm_flags)
 795{
 796	struct vxlan_fdb *f;
 797
 798	f = kmalloc(sizeof(*f), GFP_ATOMIC);
 799	if (!f)
 800		return NULL;
 801	f->state = state;
 802	f->flags = ndm_flags;
 803	f->updated = f->used = jiffies;
 804	f->vni = src_vni;
 805	f->nh = NULL;
 806	RCU_INIT_POINTER(f->vdev, vxlan);
 807	INIT_LIST_HEAD(&f->nh_list);
 808	INIT_LIST_HEAD(&f->remotes);
 809	memcpy(f->eth_addr, mac, ETH_ALEN);
 810
 811	return f;
 812}
 813
 814static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 815			     __be32 src_vni, struct vxlan_fdb *f)
 816{
 817	++vxlan->addrcnt;
 818	hlist_add_head_rcu(&f->hlist,
 819			   vxlan_fdb_head(vxlan, mac, src_vni));
 820}
 821
 822static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 823			       u32 nhid, struct netlink_ext_ack *extack)
 824{
 825	struct nexthop *old_nh = rtnl_dereference(fdb->nh);
 826	struct nexthop *nh;
 827	int err = -EINVAL;
 828
 829	if (old_nh && old_nh->id == nhid)
 830		return 0;
 831
 832	nh = nexthop_find_by_id(vxlan->net, nhid);
 833	if (!nh) {
 834		NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
 835		goto err_inval;
 836	}
 837
 838	if (!nexthop_get(nh)) {
 839		NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 840		nh = NULL;
 841		goto err_inval;
 842	}
 843	if (!nexthop_is_fdb(nh)) {
 844		NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
 845		goto err_inval;
 846	}
 847
 848	if (!nexthop_is_multipath(nh)) {
 849		NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 850		goto err_inval;
 851	}
 852
 853	/* check nexthop group family */
 854	switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 855	case AF_INET:
 856		if (!nexthop_has_v4(nh)) {
 857			err = -EAFNOSUPPORT;
 858			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 859			goto err_inval;
 860		}
 861		break;
 862	case AF_INET6:
 863		if (nexthop_has_v4(nh)) {
 864			err = -EAFNOSUPPORT;
 865			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 866			goto err_inval;
 867		}
 868	}
 869
 870	if (old_nh) {
 871		list_del_rcu(&fdb->nh_list);
 872		nexthop_put(old_nh);
 873	}
 874	rcu_assign_pointer(fdb->nh, nh);
 875	list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
 876	return 1;
 877
 878err_inval:
 879	if (nh)
 880		nexthop_put(nh);
 881	return err;
 882}
 883
 884int vxlan_fdb_create(struct vxlan_dev *vxlan,
 885		     const u8 *mac, union vxlan_addr *ip,
 886		     __u16 state, __be16 port, __be32 src_vni,
 887		     __be32 vni, __u32 ifindex, __u16 ndm_flags,
 888		     u32 nhid, struct vxlan_fdb **fdb,
 889		     struct netlink_ext_ack *extack)
 890{
 891	struct vxlan_rdst *rd = NULL;
 892	struct vxlan_fdb *f;
 893	int rc;
 894
 895	if (vxlan->cfg.addrmax &&
 896	    vxlan->addrcnt >= vxlan->cfg.addrmax)
 897		return -ENOSPC;
 898
 899	netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 900	f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 901	if (!f)
 902		return -ENOMEM;
 903
 904	if (nhid)
 905		rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 906	else
 907		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 908	if (rc < 0)
 909		goto errout;
 910
 911	*fdb = f;
 912
 913	return 0;
 914
 915errout:
 916	kfree(f);
 917	return rc;
 918}
 919
 920static void __vxlan_fdb_free(struct vxlan_fdb *f)
 921{
 922	struct vxlan_rdst *rd, *nd;
 923	struct nexthop *nh;
 924
 925	nh = rcu_dereference_raw(f->nh);
 926	if (nh) {
 927		rcu_assign_pointer(f->nh, NULL);
 928		rcu_assign_pointer(f->vdev, NULL);
 929		nexthop_put(nh);
 930	}
 931
 932	list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 933		dst_cache_destroy(&rd->dst_cache);
 934		kfree(rd);
 935	}
 936	kfree(f);
 937}
 938
 939static void vxlan_fdb_free(struct rcu_head *head)
 940{
 941	struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 942
 943	__vxlan_fdb_free(f);
 944}
 945
 946static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 947			      bool do_notify, bool swdev_notify)
 948{
 949	struct vxlan_rdst *rd;
 950
 951	netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 952
 953	--vxlan->addrcnt;
 954	if (do_notify) {
 955		if (rcu_access_pointer(f->nh))
 956			vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
 957					 swdev_notify, NULL);
 958		else
 959			list_for_each_entry(rd, &f->remotes, list)
 960				vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 961						 swdev_notify, NULL);
 962	}
 963
 964	hlist_del_rcu(&f->hlist);
 965	list_del_rcu(&f->nh_list);
 966	call_rcu(&f->rcu, vxlan_fdb_free);
 967}
 968
 969static void vxlan_dst_free(struct rcu_head *head)
 970{
 971	struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 972
 973	dst_cache_destroy(&rd->dst_cache);
 974	kfree(rd);
 975}
 976
 977static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
 978				     union vxlan_addr *ip,
 979				     __u16 state, __u16 flags,
 980				     __be16 port, __be32 vni,
 981				     __u32 ifindex, __u16 ndm_flags,
 982				     struct vxlan_fdb *f, u32 nhid,
 983				     bool swdev_notify,
 984				     struct netlink_ext_ack *extack)
 985{
 986	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
 987	struct vxlan_rdst *rd = NULL;
 988	struct vxlan_rdst oldrd;
 989	int notify = 0;
 990	int rc = 0;
 991	int err;
 992
 993	if (nhid && !rcu_access_pointer(f->nh)) {
 994		NL_SET_ERR_MSG(extack,
 995			       "Cannot replace an existing non nexthop fdb with a nexthop");
 996		return -EOPNOTSUPP;
 997	}
 998
 999	if (nhid && (flags & NLM_F_APPEND)) {
1000		NL_SET_ERR_MSG(extack,
1001			       "Cannot append to a nexthop fdb");
1002		return -EOPNOTSUPP;
1003	}
1004
1005	/* Do not allow an externally learned entry to take over an entry added
1006	 * by the user.
1007	 */
1008	if (!(fdb_flags & NTF_EXT_LEARNED) ||
1009	    !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1010		if (f->state != state) {
1011			f->state = state;
1012			f->updated = jiffies;
1013			notify = 1;
1014		}
1015		if (f->flags != fdb_flags) {
1016			f->flags = fdb_flags;
1017			f->updated = jiffies;
1018			notify = 1;
1019		}
1020	}
1021
1022	if ((flags & NLM_F_REPLACE)) {
1023		/* Only change unicasts */
1024		if (!(is_multicast_ether_addr(f->eth_addr) ||
1025		      is_zero_ether_addr(f->eth_addr))) {
1026			if (nhid) {
1027				rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1028				if (rc < 0)
1029					return rc;
1030			} else {
1031				rc = vxlan_fdb_replace(f, ip, port, vni,
1032						       ifindex, &oldrd);
1033			}
1034			notify |= rc;
1035		} else {
1036			NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1037			return -EOPNOTSUPP;
1038		}
1039	}
1040	if ((flags & NLM_F_APPEND) &&
1041	    (is_multicast_ether_addr(f->eth_addr) ||
1042	     is_zero_ether_addr(f->eth_addr))) {
1043		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1044
1045		if (rc < 0)
1046			return rc;
1047		notify |= rc;
1048	}
1049
1050	if (ndm_flags & NTF_USE)
1051		f->used = jiffies;
1052
1053	if (notify) {
1054		if (rd == NULL)
1055			rd = first_remote_rtnl(f);
1056
1057		err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1058				       swdev_notify, extack);
1059		if (err)
1060			goto err_notify;
1061	}
1062
1063	return 0;
1064
1065err_notify:
1066	if (nhid)
1067		return err;
1068	if ((flags & NLM_F_REPLACE) && rc)
1069		*rd = oldrd;
1070	else if ((flags & NLM_F_APPEND) && rc) {
1071		list_del_rcu(&rd->list);
1072		call_rcu(&rd->rcu, vxlan_dst_free);
1073	}
1074	return err;
1075}
1076
1077static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1078				   const u8 *mac, union vxlan_addr *ip,
1079				   __u16 state, __u16 flags,
1080				   __be16 port, __be32 src_vni, __be32 vni,
1081				   __u32 ifindex, __u16 ndm_flags, u32 nhid,
1082				   bool swdev_notify,
1083				   struct netlink_ext_ack *extack)
1084{
1085	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
1086	struct vxlan_fdb *f;
1087	int rc;
1088
1089	/* Disallow replace to add a multicast entry */
1090	if ((flags & NLM_F_REPLACE) &&
1091	    (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1092		return -EOPNOTSUPP;
1093
1094	netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1095	rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1096			      vni, ifindex, fdb_flags, nhid, &f, extack);
1097	if (rc < 0)
1098		return rc;
1099
1100	vxlan_fdb_insert(vxlan, mac, src_vni, f);
1101	rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1102			      swdev_notify, extack);
1103	if (rc)
1104		goto err_notify;
1105
1106	return 0;
1107
1108err_notify:
1109	vxlan_fdb_destroy(vxlan, f, false, false);
1110	return rc;
1111}
1112
1113/* Add new entry to forwarding table -- assumes lock held */
1114int vxlan_fdb_update(struct vxlan_dev *vxlan,
1115		     const u8 *mac, union vxlan_addr *ip,
1116		     __u16 state, __u16 flags,
1117		     __be16 port, __be32 src_vni, __be32 vni,
1118		     __u32 ifindex, __u16 ndm_flags, u32 nhid,
1119		     bool swdev_notify,
1120		     struct netlink_ext_ack *extack)
1121{
1122	struct vxlan_fdb *f;
1123
1124	f = __vxlan_find_mac(vxlan, mac, src_vni);
1125	if (f) {
1126		if (flags & NLM_F_EXCL) {
1127			netdev_dbg(vxlan->dev,
1128				   "lost race to create %pM\n", mac);
1129			return -EEXIST;
1130		}
1131
1132		return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1133						 vni, ifindex, ndm_flags, f,
1134						 nhid, swdev_notify, extack);
1135	} else {
1136		if (!(flags & NLM_F_CREATE))
1137			return -ENOENT;
1138
1139		return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1140					       port, src_vni, vni, ifindex,
1141					       ndm_flags, nhid, swdev_notify,
1142					       extack);
1143	}
1144}
1145
1146static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1147				  struct vxlan_rdst *rd, bool swdev_notify)
1148{
1149	list_del_rcu(&rd->list);
1150	vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1151	call_rcu(&rd->rcu, vxlan_dst_free);
1152}
1153
1154static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1155			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1156			   __be32 *vni, u32 *ifindex, u32 *nhid,
1157			   struct netlink_ext_ack *extack)
1158{
1159	struct net *net = dev_net(vxlan->dev);
1160	int err;
1161
1162	if (tb[NDA_NH_ID] &&
1163	    (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) {
1164		NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");
1165		return -EINVAL;
1166	}
1167
1168	if (tb[NDA_DST]) {
1169		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1170		if (err) {
1171			NL_SET_ERR_MSG(extack, "Unsupported address family");
1172			return err;
1173		}
1174	} else {
1175		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1176
1177		if (remote->sa.sa_family == AF_INET) {
1178			ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1179			ip->sa.sa_family = AF_INET;
1180#if IS_ENABLED(CONFIG_IPV6)
1181		} else {
1182			ip->sin6.sin6_addr = in6addr_any;
1183			ip->sa.sa_family = AF_INET6;
1184#endif
1185		}
1186	}
1187
1188	if (tb[NDA_PORT]) {
1189		if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) {
1190			NL_SET_ERR_MSG(extack, "Invalid vxlan port");
1191			return -EINVAL;
1192		}
1193		*port = nla_get_be16(tb[NDA_PORT]);
1194	} else {
1195		*port = vxlan->cfg.dst_port;
1196	}
1197
1198	if (tb[NDA_VNI]) {
1199		if (nla_len(tb[NDA_VNI]) != sizeof(u32)) {
1200			NL_SET_ERR_MSG(extack, "Invalid vni");
1201			return -EINVAL;
1202		}
1203		*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1204	} else {
1205		*vni = vxlan->default_dst.remote_vni;
1206	}
1207
1208	if (tb[NDA_SRC_VNI]) {
1209		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) {
1210			NL_SET_ERR_MSG(extack, "Invalid src vni");
1211			return -EINVAL;
1212		}
1213		*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1214	} else {
1215		*src_vni = vxlan->default_dst.remote_vni;
1216	}
1217
1218	if (tb[NDA_IFINDEX]) {
1219		struct net_device *tdev;
1220
1221		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) {
1222			NL_SET_ERR_MSG(extack, "Invalid ifindex");
1223			return -EINVAL;
1224		}
1225		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1226		tdev = __dev_get_by_index(net, *ifindex);
1227		if (!tdev) {
1228			NL_SET_ERR_MSG(extack, "Device not found");
1229			return -EADDRNOTAVAIL;
1230		}
1231	} else {
1232		*ifindex = 0;
1233	}
1234
1235	*nhid = nla_get_u32_default(tb[NDA_NH_ID], 0);
 
 
 
1236
1237	return 0;
1238}
1239
1240/* Add static entry (via netlink) */
1241static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1242			 struct net_device *dev,
1243			 const unsigned char *addr, u16 vid, u16 flags,
1244			 bool *notified, struct netlink_ext_ack *extack)
1245{
1246	struct vxlan_dev *vxlan = netdev_priv(dev);
1247	/* struct net *net = dev_net(vxlan->dev); */
1248	union vxlan_addr ip;
1249	__be16 port;
1250	__be32 src_vni, vni;
1251	u32 ifindex, nhid;
1252	u32 hash_index;
1253	int err;
1254
1255	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1256		pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1257			ndm->ndm_state);
1258		return -EINVAL;
1259	}
1260
1261	if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1262		return -EINVAL;
1263
1264	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1265			      &nhid, extack);
1266	if (err)
1267		return err;
1268
1269	if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1270		return -EAFNOSUPPORT;
1271
1272	hash_index = fdb_head_index(vxlan, addr, src_vni);
1273	spin_lock_bh(&vxlan->hash_lock[hash_index]);
1274	err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1275			       port, src_vni, vni, ifindex,
1276			       ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1277			       nhid, true, extack);
1278	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1279
1280	if (!err)
1281		*notified = true;
1282
1283	return err;
1284}
1285
1286int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1287		       const unsigned char *addr, union vxlan_addr ip,
1288		       __be16 port, __be32 src_vni, __be32 vni,
1289		       u32 ifindex, bool swdev_notify)
1290{
1291	struct vxlan_rdst *rd = NULL;
1292	struct vxlan_fdb *f;
1293	int err = -ENOENT;
1294
1295	f = vxlan_find_mac(vxlan, addr, src_vni);
1296	if (!f)
1297		return err;
1298
1299	if (!vxlan_addr_any(&ip)) {
1300		rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1301		if (!rd)
1302			goto out;
1303	}
1304
1305	/* remove a destination if it's not the only one on the list,
1306	 * otherwise destroy the fdb entry
1307	 */
1308	if (rd && !list_is_singular(&f->remotes)) {
1309		vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1310		goto out;
1311	}
1312
1313	vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1314
1315out:
1316	return 0;
1317}
1318
1319/* Delete entry (via netlink) */
1320static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1321			    struct net_device *dev,
1322			    const unsigned char *addr, u16 vid, bool *notified,
1323			    struct netlink_ext_ack *extack)
1324{
1325	struct vxlan_dev *vxlan = netdev_priv(dev);
1326	union vxlan_addr ip;
1327	__be32 src_vni, vni;
1328	u32 ifindex, nhid;
1329	u32 hash_index;
1330	__be16 port;
1331	int err;
1332
1333	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1334			      &nhid, extack);
1335	if (err)
1336		return err;
1337
1338	hash_index = fdb_head_index(vxlan, addr, src_vni);
1339	spin_lock_bh(&vxlan->hash_lock[hash_index]);
1340	err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1341				 true);
1342	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1343
1344	if (!err)
1345		*notified = true;
1346
1347	return err;
1348}
1349
1350/* Dump forwarding table */
1351static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1352			  struct net_device *dev,
1353			  struct net_device *filter_dev, int *idx)
1354{
1355	struct vxlan_dev *vxlan = netdev_priv(dev);
1356	unsigned int h;
1357	int err = 0;
1358
1359	for (h = 0; h < FDB_HASH_SIZE; ++h) {
1360		struct vxlan_fdb *f;
1361
1362		rcu_read_lock();
1363		hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1364			struct vxlan_rdst *rd;
1365
1366			if (rcu_access_pointer(f->nh)) {
1367				if (*idx < cb->args[2])
1368					goto skip_nh;
1369				err = vxlan_fdb_info(skb, vxlan, f,
1370						     NETLINK_CB(cb->skb).portid,
1371						     cb->nlh->nlmsg_seq,
1372						     RTM_NEWNEIGH,
1373						     NLM_F_MULTI, NULL);
1374				if (err < 0) {
1375					rcu_read_unlock();
1376					goto out;
1377				}
1378skip_nh:
1379				*idx += 1;
1380				continue;
1381			}
1382
1383			list_for_each_entry_rcu(rd, &f->remotes, list) {
1384				if (*idx < cb->args[2])
1385					goto skip;
1386
1387				err = vxlan_fdb_info(skb, vxlan, f,
1388						     NETLINK_CB(cb->skb).portid,
1389						     cb->nlh->nlmsg_seq,
1390						     RTM_NEWNEIGH,
1391						     NLM_F_MULTI, rd);
1392				if (err < 0) {
1393					rcu_read_unlock();
1394					goto out;
1395				}
1396skip:
1397				*idx += 1;
1398			}
1399		}
1400		rcu_read_unlock();
1401	}
1402out:
1403	return err;
1404}
1405
1406static int vxlan_fdb_get(struct sk_buff *skb,
1407			 struct nlattr *tb[],
1408			 struct net_device *dev,
1409			 const unsigned char *addr,
1410			 u16 vid, u32 portid, u32 seq,
1411			 struct netlink_ext_ack *extack)
1412{
1413	struct vxlan_dev *vxlan = netdev_priv(dev);
1414	struct vxlan_fdb *f;
1415	__be32 vni;
1416	int err;
1417
1418	if (tb[NDA_VNI])
1419		vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1420	else
1421		vni = vxlan->default_dst.remote_vni;
1422
1423	rcu_read_lock();
1424
1425	f = __vxlan_find_mac(vxlan, addr, vni);
1426	if (!f) {
1427		NL_SET_ERR_MSG(extack, "Fdb entry not found");
1428		err = -ENOENT;
1429		goto errout;
1430	}
1431
1432	err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1433			     RTM_NEWNEIGH, 0, first_remote_rcu(f));
1434errout:
1435	rcu_read_unlock();
1436	return err;
1437}
1438
1439/* Watch incoming packets to learn mapping between Ethernet address
1440 * and Tunnel endpoint.
 
1441 */
1442static enum skb_drop_reason vxlan_snoop(struct net_device *dev,
1443					union vxlan_addr *src_ip,
1444					const u8 *src_mac, u32 src_ifindex,
1445					__be32 vni)
1446{
1447	struct vxlan_dev *vxlan = netdev_priv(dev);
1448	struct vxlan_fdb *f;
1449	u32 ifindex = 0;
1450
1451	/* Ignore packets from invalid src-address */
1452	if (!is_valid_ether_addr(src_mac))
1453		return SKB_DROP_REASON_MAC_INVALID_SOURCE;
1454
1455#if IS_ENABLED(CONFIG_IPV6)
1456	if (src_ip->sa.sa_family == AF_INET6 &&
1457	    (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1458		ifindex = src_ifindex;
1459#endif
1460
1461	f = vxlan_find_mac(vxlan, src_mac, vni);
1462	if (likely(f)) {
1463		struct vxlan_rdst *rdst = first_remote_rcu(f);
1464
1465		if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1466			   rdst->remote_ifindex == ifindex))
1467			return SKB_NOT_DROPPED_YET;
1468
1469		/* Don't migrate static entries, drop packets */
1470		if (f->state & (NUD_PERMANENT | NUD_NOARP))
1471			return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS;
1472
1473		/* Don't override an fdb with nexthop with a learnt entry */
1474		if (rcu_access_pointer(f->nh))
1475			return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS;
1476
1477		if (net_ratelimit())
1478			netdev_info(dev,
1479				    "%pM migrated from %pIS to %pIS\n",
1480				    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1481
1482		rdst->remote_ip = *src_ip;
1483		f->updated = jiffies;
1484		vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1485	} else {
1486		u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1487
1488		/* learned new entry */
1489		spin_lock(&vxlan->hash_lock[hash_index]);
1490
1491		/* close off race between vxlan_flush and incoming packets */
1492		if (netif_running(dev))
1493			vxlan_fdb_update(vxlan, src_mac, src_ip,
1494					 NUD_REACHABLE,
1495					 NLM_F_EXCL|NLM_F_CREATE,
1496					 vxlan->cfg.dst_port,
1497					 vni,
1498					 vxlan->default_dst.remote_vni,
1499					 ifindex, NTF_SELF, 0, true, NULL);
1500		spin_unlock(&vxlan->hash_lock[hash_index]);
1501	}
1502
1503	return SKB_NOT_DROPPED_YET;
1504}
1505
1506static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1507{
1508	struct vxlan_net *vn;
1509
1510	if (!vs)
1511		return false;
1512	if (!refcount_dec_and_test(&vs->refcnt))
1513		return false;
1514
1515	vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1516	spin_lock(&vn->sock_lock);
1517	hlist_del_rcu(&vs->hlist);
1518	udp_tunnel_notify_del_rx_port(vs->sock,
1519				      (vs->flags & VXLAN_F_GPE) ?
1520				      UDP_TUNNEL_TYPE_VXLAN_GPE :
1521				      UDP_TUNNEL_TYPE_VXLAN);
1522	spin_unlock(&vn->sock_lock);
1523
1524	return true;
1525}
1526
1527static void vxlan_sock_release(struct vxlan_dev *vxlan)
1528{
1529	struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1530#if IS_ENABLED(CONFIG_IPV6)
1531	struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1532
1533	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1534#endif
1535
1536	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1537	synchronize_net();
1538
1539	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
1540		vxlan_vs_del_vnigrp(vxlan);
1541	else
1542		vxlan_vs_del_dev(vxlan);
1543
1544	if (__vxlan_sock_release_prep(sock4)) {
1545		udp_tunnel_sock_release(sock4->sock);
1546		kfree(sock4);
1547	}
1548
1549#if IS_ENABLED(CONFIG_IPV6)
1550	if (__vxlan_sock_release_prep(sock6)) {
1551		udp_tunnel_sock_release(sock6->sock);
1552		kfree(sock6);
1553	}
1554#endif
1555}
1556
1557static enum skb_drop_reason vxlan_remcsum(struct vxlanhdr *unparsed,
1558					  struct sk_buff *skb,
1559					  u32 vxflags)
1560{
1561	enum skb_drop_reason reason;
1562	size_t start, offset;
1563
1564	if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1565		goto out;
1566
1567	start = vxlan_rco_start(unparsed->vx_vni);
1568	offset = start + vxlan_rco_offset(unparsed->vx_vni);
1569
1570	reason = pskb_may_pull_reason(skb, offset + sizeof(u16));
1571	if (reason)
1572		return reason;
1573
1574	skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1575			    !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1576out:
1577	unparsed->vx_flags &= ~VXLAN_HF_RCO;
1578	unparsed->vx_vni &= VXLAN_VNI_MASK;
1579
1580	return SKB_NOT_DROPPED_YET;
1581}
1582
1583static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1584				struct sk_buff *skb, u32 vxflags,
1585				struct vxlan_metadata *md)
1586{
1587	struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1588	struct metadata_dst *tun_dst;
1589
1590	if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1591		goto out;
1592
1593	md->gbp = ntohs(gbp->policy_id);
1594
1595	tun_dst = (struct metadata_dst *)skb_dst(skb);
1596	if (tun_dst) {
1597		__set_bit(IP_TUNNEL_VXLAN_OPT_BIT,
1598			  tun_dst->u.tun_info.key.tun_flags);
1599		tun_dst->u.tun_info.options_len = sizeof(*md);
1600	}
1601	if (gbp->dont_learn)
1602		md->gbp |= VXLAN_GBP_DONT_LEARN;
1603
1604	if (gbp->policy_applied)
1605		md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1606
1607	/* In flow-based mode, GBP is carried in dst_metadata */
1608	if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1609		skb->mark = md->gbp;
1610out:
1611	unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1612}
1613
1614static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan,
1615					  struct vxlan_sock *vs,
1616					  struct sk_buff *skb, __be32 vni)
1617{
1618	union vxlan_addr saddr;
1619	u32 ifindex = skb->dev->ifindex;
1620
1621	skb_reset_mac_header(skb);
1622	skb->protocol = eth_type_trans(skb, vxlan->dev);
1623	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1624
1625	/* Ignore packet loops (and multicast echo) */
1626	if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1627		return SKB_DROP_REASON_LOCAL_MAC;
 
 
 
 
1628
1629	/* Get address from the outer IP header */
1630	if (vxlan_get_sk_family(vs) == AF_INET) {
1631		saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1632		saddr.sa.sa_family = AF_INET;
1633#if IS_ENABLED(CONFIG_IPV6)
1634	} else {
1635		saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1636		saddr.sa.sa_family = AF_INET6;
1637#endif
1638	}
1639
1640	if (!(vxlan->cfg.flags & VXLAN_F_LEARN))
1641		return SKB_NOT_DROPPED_YET;
 
1642
1643	return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source,
1644			   ifindex, vni);
1645}
1646
1647static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1648				  struct sk_buff *skb)
1649{
1650	int err = 0;
1651
1652	if (vxlan_get_sk_family(vs) == AF_INET)
1653		err = IP_ECN_decapsulate(oiph, skb);
1654#if IS_ENABLED(CONFIG_IPV6)
1655	else
1656		err = IP6_ECN_decapsulate(oiph, skb);
1657#endif
1658
1659	if (unlikely(err) && log_ecn_error) {
1660		if (vxlan_get_sk_family(vs) == AF_INET)
1661			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1662					     &((struct iphdr *)oiph)->saddr,
1663					     ((struct iphdr *)oiph)->tos);
1664		else
1665			net_info_ratelimited("non-ECT from %pI6\n",
1666					     &((struct ipv6hdr *)oiph)->saddr);
1667	}
1668	return err <= 1;
1669}
1670
1671/* Callback from net/ipv4/udp.c to receive packets */
1672static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1673{
1674	struct vxlan_vni_node *vninode = NULL;
1675	struct vxlan_dev *vxlan;
1676	struct vxlan_sock *vs;
1677	struct vxlanhdr unparsed;
1678	struct vxlan_metadata _md;
1679	struct vxlan_metadata *md = &_md;
1680	__be16 protocol = htons(ETH_P_TEB);
1681	enum skb_drop_reason reason;
1682	bool raw_proto = false;
1683	void *oiph;
1684	__be32 vni = 0;
1685	int nh;
1686
1687	/* Need UDP and VXLAN header to be present */
1688	reason = pskb_may_pull_reason(skb, VXLAN_HLEN);
1689	if (reason)
1690		goto drop;
1691
1692	unparsed = *vxlan_hdr(skb);
1693	/* VNI flag always required to be set */
1694	if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1695		netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1696			   ntohl(vxlan_hdr(skb)->vx_flags),
1697			   ntohl(vxlan_hdr(skb)->vx_vni));
1698		reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
1699		/* Return non vxlan pkt */
1700		goto drop;
1701	}
1702	unparsed.vx_flags &= ~VXLAN_HF_VNI;
1703	unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1704
1705	vs = rcu_dereference_sk_user_data(sk);
1706	if (!vs)
1707		goto drop;
1708
1709	vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1710
1711	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
1712	if (!vxlan) {
1713		reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND;
1714		goto drop;
1715	}
1716
1717	/* For backwards compatibility, only allow reserved fields to be
1718	 * used by VXLAN extensions if explicitly requested.
1719	 */
1720	if (vs->flags & VXLAN_F_GPE) {
1721		if (!vxlan_parse_gpe_proto(&unparsed, &protocol))
1722			goto drop;
1723		unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS;
1724		raw_proto = true;
1725	}
1726
1727	if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1728				   !net_eq(vxlan->net, dev_net(vxlan->dev)))) {
1729		reason = SKB_DROP_REASON_NOMEM;
1730		goto drop;
1731	}
1732
1733	if (vs->flags & VXLAN_F_REMCSUM_RX) {
1734		reason = vxlan_remcsum(&unparsed, skb, vs->flags);
1735		if (unlikely(reason))
1736			goto drop;
1737	}
1738
1739	if (vxlan_collect_metadata(vs)) {
1740		IP_TUNNEL_DECLARE_FLAGS(flags) = { };
1741		struct metadata_dst *tun_dst;
1742
1743		__set_bit(IP_TUNNEL_KEY_BIT, flags);
1744		tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags,
1745					 key32_to_tunnel_id(vni), sizeof(*md));
1746
1747		if (!tun_dst) {
1748			reason = SKB_DROP_REASON_NOMEM;
1749			goto drop;
1750		}
1751
1752		md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1753
1754		skb_dst_set(skb, (struct dst_entry *)tun_dst);
1755	} else {
1756		memset(md, 0, sizeof(*md));
1757	}
1758
1759	if (vs->flags & VXLAN_F_GBP)
1760		vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1761	/* Note that GBP and GPE can never be active together. This is
1762	 * ensured in vxlan_dev_configure.
1763	 */
1764
1765	if (unparsed.vx_flags || unparsed.vx_vni) {
1766		/* If there are any unprocessed flags remaining treat
1767		 * this as a malformed packet. This behavior diverges from
1768		 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1769		 * in reserved fields are to be ignored. The approach here
1770		 * maintains compatibility with previous stack code, and also
1771		 * is more robust and provides a little more security in
1772		 * adding extensions to VXLAN.
1773		 */
1774		reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
1775		goto drop;
1776	}
1777
1778	if (!raw_proto) {
1779		reason = vxlan_set_mac(vxlan, vs, skb, vni);
1780		if (reason)
1781			goto drop;
1782	} else {
1783		skb_reset_mac_header(skb);
1784		skb->dev = vxlan->dev;
1785		skb->pkt_type = PACKET_HOST;
1786	}
1787
1788	/* Save offset of outer header relative to skb->head,
1789	 * because we are going to reset the network header to the inner header
1790	 * and might change skb->head.
1791	 */
1792	nh = skb_network_header(skb) - skb->head;
1793
1794	skb_reset_network_header(skb);
1795
1796	reason = pskb_inet_may_pull_reason(skb);
1797	if (reason) {
1798		DEV_STATS_INC(vxlan->dev, rx_length_errors);
1799		DEV_STATS_INC(vxlan->dev, rx_errors);
1800		vxlan_vnifilter_count(vxlan, vni, vninode,
1801				      VXLAN_VNI_STATS_RX_ERRORS, 0);
1802		goto drop;
1803	}
1804
1805	/* Get the outer header. */
1806	oiph = skb->head + nh;
1807
1808	if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1809		reason = SKB_DROP_REASON_IP_TUNNEL_ECN;
1810		DEV_STATS_INC(vxlan->dev, rx_frame_errors);
1811		DEV_STATS_INC(vxlan->dev, rx_errors);
1812		vxlan_vnifilter_count(vxlan, vni, vninode,
1813				      VXLAN_VNI_STATS_RX_ERRORS, 0);
1814		goto drop;
1815	}
1816
1817	rcu_read_lock();
1818
1819	if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1820		rcu_read_unlock();
1821		dev_core_stats_rx_dropped_inc(vxlan->dev);
1822		vxlan_vnifilter_count(vxlan, vni, vninode,
1823				      VXLAN_VNI_STATS_RX_DROPS, 0);
1824		reason = SKB_DROP_REASON_DEV_READY;
1825		goto drop;
1826	}
1827
1828	dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1829	vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len);
1830	gro_cells_receive(&vxlan->gro_cells, skb);
1831
1832	rcu_read_unlock();
1833
1834	return 0;
1835
1836drop:
1837	reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED;
1838	/* Consume bad packet */
1839	kfree_skb_reason(skb, reason);
1840	return 0;
1841}
1842
1843/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1844static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1845{
1846	struct vxlan_dev *vxlan;
1847	struct vxlan_sock *vs;
1848	struct vxlanhdr *hdr;
1849	__be32 vni;
1850
1851	if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1852		return -EINVAL;
1853
1854	hdr = vxlan_hdr(skb);
1855
1856	if (!(hdr->vx_flags & VXLAN_HF_VNI))
1857		return -EINVAL;
1858
1859	vs = rcu_dereference_sk_user_data(sk);
1860	if (!vs)
1861		return -ENOENT;
1862
1863	vni = vxlan_vni(hdr->vx_vni);
1864	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL);
1865	if (!vxlan)
1866		return -ENOENT;
1867
1868	return 0;
1869}
1870
1871static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1872{
1873	struct vxlan_dev *vxlan = netdev_priv(dev);
1874	struct arphdr *parp;
1875	u8 *arpptr, *sha;
1876	__be32 sip, tip;
1877	struct neighbour *n;
1878
1879	if (dev->flags & IFF_NOARP)
1880		goto out;
1881
1882	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1883		dev_core_stats_tx_dropped_inc(dev);
1884		vxlan_vnifilter_count(vxlan, vni, NULL,
1885				      VXLAN_VNI_STATS_TX_DROPS, 0);
1886		goto out;
1887	}
1888	parp = arp_hdr(skb);
1889
1890	if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1891	     parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1892	    parp->ar_pro != htons(ETH_P_IP) ||
1893	    parp->ar_op != htons(ARPOP_REQUEST) ||
1894	    parp->ar_hln != dev->addr_len ||
1895	    parp->ar_pln != 4)
1896		goto out;
1897	arpptr = (u8 *)parp + sizeof(struct arphdr);
1898	sha = arpptr;
1899	arpptr += dev->addr_len;	/* sha */
1900	memcpy(&sip, arpptr, sizeof(sip));
1901	arpptr += sizeof(sip);
1902	arpptr += dev->addr_len;	/* tha */
1903	memcpy(&tip, arpptr, sizeof(tip));
1904
1905	if (ipv4_is_loopback(tip) ||
1906	    ipv4_is_multicast(tip))
1907		goto out;
1908
1909	n = neigh_lookup(&arp_tbl, &tip, dev);
1910
1911	if (n) {
1912		struct vxlan_fdb *f;
1913		struct sk_buff	*reply;
1914
1915		if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
1916			neigh_release(n);
1917			goto out;
1918		}
1919
1920		f = vxlan_find_mac(vxlan, n->ha, vni);
1921		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1922			/* bridge-local neighbor */
1923			neigh_release(n);
1924			goto out;
1925		}
1926
1927		reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1928				n->ha, sha);
1929
1930		neigh_release(n);
1931
1932		if (reply == NULL)
1933			goto out;
1934
1935		skb_reset_mac_header(reply);
1936		__skb_pull(reply, skb_network_offset(reply));
1937		reply->ip_summed = CHECKSUM_UNNECESSARY;
1938		reply->pkt_type = PACKET_HOST;
1939
1940		if (netif_rx(reply) == NET_RX_DROP) {
1941			dev_core_stats_rx_dropped_inc(dev);
1942			vxlan_vnifilter_count(vxlan, vni, NULL,
1943					      VXLAN_VNI_STATS_RX_DROPS, 0);
1944		}
1945
1946	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1947		union vxlan_addr ipa = {
1948			.sin.sin_addr.s_addr = tip,
1949			.sin.sin_family = AF_INET,
1950		};
1951
1952		vxlan_ip_miss(dev, &ipa);
1953	}
1954out:
1955	consume_skb(skb);
1956	return NETDEV_TX_OK;
1957}
1958
1959#if IS_ENABLED(CONFIG_IPV6)
1960static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1961	struct neighbour *n, bool isrouter)
1962{
1963	struct net_device *dev = request->dev;
1964	struct sk_buff *reply;
1965	struct nd_msg *ns, *na;
1966	struct ipv6hdr *pip6;
1967	u8 *daddr;
1968	int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1969	int ns_olen;
1970	int i, len;
1971
1972	if (dev == NULL || !pskb_may_pull(request, request->len))
1973		return NULL;
1974
1975	len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1976		sizeof(*na) + na_olen + dev->needed_tailroom;
1977	reply = alloc_skb(len, GFP_ATOMIC);
1978	if (reply == NULL)
1979		return NULL;
1980
1981	reply->protocol = htons(ETH_P_IPV6);
1982	reply->dev = dev;
1983	skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1984	skb_push(reply, sizeof(struct ethhdr));
1985	skb_reset_mac_header(reply);
1986
1987	ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1988
1989	daddr = eth_hdr(request)->h_source;
1990	ns_olen = request->len - skb_network_offset(request) -
1991		sizeof(struct ipv6hdr) - sizeof(*ns);
1992	for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1993		if (!ns->opt[i + 1]) {
1994			kfree_skb(reply);
1995			return NULL;
1996		}
1997		if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1998			daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1999			break;
2000		}
2001	}
2002
2003	/* Ethernet header */
2004	ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2005	ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2006	eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2007	reply->protocol = htons(ETH_P_IPV6);
2008
2009	skb_pull(reply, sizeof(struct ethhdr));
2010	skb_reset_network_header(reply);
2011	skb_put(reply, sizeof(struct ipv6hdr));
2012
2013	/* IPv6 header */
2014
2015	pip6 = ipv6_hdr(reply);
2016	memset(pip6, 0, sizeof(struct ipv6hdr));
2017	pip6->version = 6;
2018	pip6->priority = ipv6_hdr(request)->priority;
2019	pip6->nexthdr = IPPROTO_ICMPV6;
2020	pip6->hop_limit = 255;
2021	pip6->daddr = ipv6_hdr(request)->saddr;
2022	pip6->saddr = *(struct in6_addr *)n->primary_key;
2023
2024	skb_pull(reply, sizeof(struct ipv6hdr));
2025	skb_reset_transport_header(reply);
2026
2027	/* Neighbor Advertisement */
2028	na = skb_put_zero(reply, sizeof(*na) + na_olen);
2029	na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2030	na->icmph.icmp6_router = isrouter;
2031	na->icmph.icmp6_override = 1;
2032	na->icmph.icmp6_solicited = 1;
2033	na->target = ns->target;
2034	ether_addr_copy(&na->opt[2], n->ha);
2035	na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2036	na->opt[1] = na_olen >> 3;
2037
2038	na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2039		&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2040		csum_partial(na, sizeof(*na)+na_olen, 0));
2041
2042	pip6->payload_len = htons(sizeof(*na)+na_olen);
2043
2044	skb_push(reply, sizeof(struct ipv6hdr));
2045
2046	reply->ip_summed = CHECKSUM_UNNECESSARY;
2047
2048	return reply;
2049}
2050
2051static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2052{
2053	struct vxlan_dev *vxlan = netdev_priv(dev);
2054	const struct in6_addr *daddr;
2055	const struct ipv6hdr *iphdr;
2056	struct inet6_dev *in6_dev;
2057	struct neighbour *n;
2058	struct nd_msg *msg;
2059
2060	rcu_read_lock();
2061	in6_dev = __in6_dev_get(dev);
2062	if (!in6_dev)
2063		goto out;
2064
2065	iphdr = ipv6_hdr(skb);
2066	daddr = &iphdr->daddr;
2067	msg = (struct nd_msg *)(iphdr + 1);
2068
2069	if (ipv6_addr_loopback(daddr) ||
2070	    ipv6_addr_is_multicast(&msg->target))
2071		goto out;
2072
2073	n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2074
2075	if (n) {
2076		struct vxlan_fdb *f;
2077		struct sk_buff *reply;
2078
2079		if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
2080			neigh_release(n);
2081			goto out;
2082		}
2083
2084		f = vxlan_find_mac(vxlan, n->ha, vni);
2085		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2086			/* bridge-local neighbor */
2087			neigh_release(n);
2088			goto out;
2089		}
2090
2091		reply = vxlan_na_create(skb, n,
2092					!!(f ? f->flags & NTF_ROUTER : 0));
2093
2094		neigh_release(n);
2095
2096		if (reply == NULL)
2097			goto out;
2098
2099		if (netif_rx(reply) == NET_RX_DROP) {
2100			dev_core_stats_rx_dropped_inc(dev);
2101			vxlan_vnifilter_count(vxlan, vni, NULL,
2102					      VXLAN_VNI_STATS_RX_DROPS, 0);
2103		}
2104	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2105		union vxlan_addr ipa = {
2106			.sin6.sin6_addr = msg->target,
2107			.sin6.sin6_family = AF_INET6,
2108		};
2109
2110		vxlan_ip_miss(dev, &ipa);
2111	}
2112
2113out:
2114	rcu_read_unlock();
2115	consume_skb(skb);
2116	return NETDEV_TX_OK;
2117}
2118#endif
2119
2120static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2121{
2122	struct vxlan_dev *vxlan = netdev_priv(dev);
2123	struct neighbour *n;
2124
2125	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2126		return false;
2127
2128	n = NULL;
2129	switch (ntohs(eth_hdr(skb)->h_proto)) {
2130	case ETH_P_IP:
2131	{
2132		struct iphdr *pip;
2133
2134		if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2135			return false;
2136		pip = ip_hdr(skb);
2137		n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2138		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2139			union vxlan_addr ipa = {
2140				.sin.sin_addr.s_addr = pip->daddr,
2141				.sin.sin_family = AF_INET,
2142			};
2143
2144			vxlan_ip_miss(dev, &ipa);
2145			return false;
2146		}
2147
2148		break;
2149	}
2150#if IS_ENABLED(CONFIG_IPV6)
2151	case ETH_P_IPV6:
2152	{
2153		struct ipv6hdr *pip6;
2154
2155		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2156			return false;
2157		pip6 = ipv6_hdr(skb);
2158		n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2159		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2160			union vxlan_addr ipa = {
2161				.sin6.sin6_addr = pip6->daddr,
2162				.sin6.sin6_family = AF_INET6,
2163			};
2164
2165			vxlan_ip_miss(dev, &ipa);
2166			return false;
2167		}
2168
2169		break;
2170	}
2171#endif
2172	default:
2173		return false;
2174	}
2175
2176	if (n) {
2177		bool diff;
2178
2179		diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2180		if (diff) {
2181			memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2182				dev->addr_len);
2183			memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2184		}
2185		neigh_release(n);
2186		return diff;
2187	}
2188
2189	return false;
2190}
2191
2192static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol)
2193{
2194	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2195
2196	gpe->np_applied = 1;
2197	gpe->next_protocol = tun_p_from_eth_p(protocol);
2198	if (!gpe->next_protocol)
2199		return -EPFNOSUPPORT;
2200	return 0;
2201}
2202
2203static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2204			   int iphdr_len, __be32 vni,
2205			   struct vxlan_metadata *md, u32 vxflags,
2206			   bool udp_sum)
2207{
2208	struct vxlanhdr *vxh;
2209	int min_headroom;
2210	int err;
2211	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2212	__be16 inner_protocol = htons(ETH_P_TEB);
2213
2214	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2215	    skb->ip_summed == CHECKSUM_PARTIAL) {
2216		int csum_start = skb_checksum_start_offset(skb);
2217
2218		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2219		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2220		    (skb->csum_offset == offsetof(struct udphdr, check) ||
2221		     skb->csum_offset == offsetof(struct tcphdr, check)))
2222			type |= SKB_GSO_TUNNEL_REMCSUM;
2223	}
2224
2225	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2226			+ VXLAN_HLEN + iphdr_len;
2227
2228	/* Need space for new headers (invalidates iph ptr) */
2229	err = skb_cow_head(skb, min_headroom);
2230	if (unlikely(err))
2231		return err;
2232
2233	err = iptunnel_handle_offloads(skb, type);
2234	if (err)
2235		return err;
2236
2237	vxh = __skb_push(skb, sizeof(*vxh));
2238	vxh->vx_flags = VXLAN_HF_VNI;
2239	vxh->vx_vni = vxlan_vni_field(vni);
2240
2241	if (type & SKB_GSO_TUNNEL_REMCSUM) {
2242		unsigned int start;
2243
2244		start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2245		vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2246		vxh->vx_flags |= VXLAN_HF_RCO;
2247
2248		if (!skb_is_gso(skb)) {
2249			skb->ip_summed = CHECKSUM_NONE;
2250			skb->encapsulation = 0;
2251		}
2252	}
2253
2254	if (vxflags & VXLAN_F_GBP)
2255		vxlan_build_gbp_hdr(vxh, md);
2256	if (vxflags & VXLAN_F_GPE) {
2257		err = vxlan_build_gpe_hdr(vxh, skb->protocol);
2258		if (err < 0)
2259			return err;
2260		inner_protocol = skb->protocol;
2261	}
2262
2263	skb_set_inner_protocol(skb, inner_protocol);
2264	return 0;
2265}
2266
2267/* Bypass encapsulation if the destination is local */
2268static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2269			       struct vxlan_dev *dst_vxlan, __be32 vni,
2270			       bool snoop)
2271{
2272	union vxlan_addr loopback;
2273	union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2274	struct net_device *dev;
2275	int len = skb->len;
2276
2277	skb->pkt_type = PACKET_HOST;
2278	skb->encapsulation = 0;
2279	skb->dev = dst_vxlan->dev;
2280	__skb_pull(skb, skb_network_offset(skb));
2281
2282	if (remote_ip->sa.sa_family == AF_INET) {
2283		loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2284		loopback.sa.sa_family =  AF_INET;
2285#if IS_ENABLED(CONFIG_IPV6)
2286	} else {
2287		loopback.sin6.sin6_addr = in6addr_loopback;
2288		loopback.sa.sa_family =  AF_INET6;
2289#endif
2290	}
2291
2292	rcu_read_lock();
2293	dev = skb->dev;
2294	if (unlikely(!(dev->flags & IFF_UP))) {
2295		kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY);
2296		goto drop;
2297	}
2298
2299	if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2300		vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2301
2302	dev_sw_netstats_tx_add(src_vxlan->dev, 1, len);
2303	vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len);
2304
2305	if (__netif_rx(skb) == NET_RX_SUCCESS) {
2306		dev_sw_netstats_rx_add(dst_vxlan->dev, len);
2307		vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX,
2308				      len);
2309	} else {
2310drop:
2311		dev_core_stats_rx_dropped_inc(dev);
2312		vxlan_vnifilter_count(dst_vxlan, vni, NULL,
2313				      VXLAN_VNI_STATS_RX_DROPS, 0);
2314	}
2315	rcu_read_unlock();
2316}
2317
2318static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2319				 struct vxlan_dev *vxlan,
2320				 int addr_family,
2321				 __be16 dst_port, int dst_ifindex, __be32 vni,
2322				 struct dst_entry *dst,
2323				 u32 rt_flags)
2324{
2325#if IS_ENABLED(CONFIG_IPV6)
2326	/* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2327	 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2328	 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2329	 */
2330	BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2331#endif
2332	/* Bypass encapsulation if the destination is local */
2333	if (rt_flags & RTCF_LOCAL &&
2334	    !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
2335	    vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) {
2336		struct vxlan_dev *dst_vxlan;
2337
2338		dst_release(dst);
2339		dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2340					   addr_family, dst_port,
2341					   vxlan->cfg.flags);
2342		if (!dst_vxlan) {
2343			DEV_STATS_INC(dev, tx_errors);
2344			vxlan_vnifilter_count(vxlan, vni, NULL,
2345					      VXLAN_VNI_STATS_TX_ERRORS, 0);
2346			kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND);
2347
2348			return -ENOENT;
2349		}
2350		vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2351		return 1;
2352	}
2353
2354	return 0;
2355}
2356
2357void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2358		    __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc)
2359{
2360	struct dst_cache *dst_cache;
2361	struct ip_tunnel_info *info;
2362	struct ip_tunnel_key *pkey;
2363	struct ip_tunnel_key key;
2364	struct vxlan_dev *vxlan = netdev_priv(dev);
2365	const struct iphdr *old_iph;
2366	struct vxlan_metadata _md;
2367	struct vxlan_metadata *md = &_md;
2368	unsigned int pkt_len = skb->len;
2369	__be16 src_port = 0, dst_port;
2370	struct dst_entry *ndst = NULL;
2371	int addr_family;
2372	__u8 tos, ttl;
2373	int ifindex;
2374	int err;
2375	u32 flags = vxlan->cfg.flags;
2376	bool use_cache;
2377	bool udp_sum = false;
2378	bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2379	enum skb_drop_reason reason;
2380	bool no_eth_encap;
2381	__be32 vni = 0;
2382
2383	no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB);
2384	reason = skb_vlan_inet_prepare(skb, no_eth_encap);
2385	if (reason)
2386		goto drop;
2387
2388	reason = SKB_DROP_REASON_NOT_SPECIFIED;
2389	old_iph = ip_hdr(skb);
2390
2391	info = skb_tunnel_info(skb);
2392	use_cache = ip_tunnel_dst_cache_usable(skb, info);
2393
2394	if (rdst) {
2395		memset(&key, 0, sizeof(key));
2396		pkey = &key;
2397
2398		if (vxlan_addr_any(&rdst->remote_ip)) {
2399			if (did_rsc) {
2400				/* short-circuited back to local bridge */
2401				vxlan_encap_bypass(skb, vxlan, vxlan,
2402						   default_vni, true);
2403				return;
2404			}
2405			goto drop;
2406		}
2407
2408		addr_family = vxlan->cfg.saddr.sa.sa_family;
2409		dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2410		vni = (rdst->remote_vni) ? : default_vni;
2411		ifindex = rdst->remote_ifindex;
2412
2413		if (addr_family == AF_INET) {
2414			key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2415			key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr;
2416		} else {
2417			key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr;
2418			key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr;
2419		}
2420
2421		dst_cache = &rdst->dst_cache;
2422		md->gbp = skb->mark;
2423		if (flags & VXLAN_F_TTL_INHERIT) {
2424			ttl = ip_tunnel_get_ttl(old_iph, skb);
2425		} else {
2426			ttl = vxlan->cfg.ttl;
2427			if (!ttl && vxlan_addr_multicast(&rdst->remote_ip))
2428				ttl = 1;
2429		}
2430		tos = vxlan->cfg.tos;
2431		if (tos == 1)
2432			tos = ip_tunnel_get_dsfield(old_iph, skb);
2433		if (tos && !info)
2434			use_cache = false;
2435
2436		if (addr_family == AF_INET)
2437			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2438		else
2439			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2440#if IS_ENABLED(CONFIG_IPV6)
2441		switch (vxlan->cfg.label_policy) {
2442		case VXLAN_LABEL_FIXED:
2443			key.label = vxlan->cfg.label;
2444			break;
2445		case VXLAN_LABEL_INHERIT:
2446			key.label = ip_tunnel_get_flowlabel(old_iph, skb);
2447			break;
2448		default:
2449			DEBUG_NET_WARN_ON_ONCE(1);
2450			goto drop;
2451		}
2452#endif
2453	} else {
2454		if (!info) {
2455			WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2456				  dev->name);
2457			goto drop;
2458		}
2459		pkey = &info->key;
2460		addr_family = ip_tunnel_info_af(info);
2461		dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2462		vni = tunnel_id_to_key32(info->key.tun_id);
2463		ifindex = 0;
2464		dst_cache = &info->dst_cache;
2465		if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) {
2466			if (info->options_len < sizeof(*md))
2467				goto drop;
2468			md = ip_tunnel_info_opts(info);
2469		}
2470		ttl = info->key.ttl;
2471		tos = info->key.tos;
2472		udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
2473	}
2474	src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2475				     vxlan->cfg.port_max, true);
2476
2477	rcu_read_lock();
2478	if (addr_family == AF_INET) {
2479		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2480		struct rtable *rt;
2481		__be16 df = 0;
2482		__be32 saddr;
2483
2484		if (!ifindex)
2485			ifindex = sock4->sock->sk->sk_bound_dev_if;
2486
2487		rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex,
2488					   &saddr, pkey, src_port, dst_port,
2489					   tos, use_cache ? dst_cache : NULL);
2490		if (IS_ERR(rt)) {
2491			err = PTR_ERR(rt);
2492			reason = SKB_DROP_REASON_IP_OUTNOROUTES;
2493			goto tx_error;
2494		}
2495
2496		if (!info) {
2497			/* Bypass encapsulation if the destination is local */
2498			err = encap_bypass_if_local(skb, dev, vxlan, AF_INET,
2499						    dst_port, ifindex, vni,
2500						    &rt->dst, rt->rt_flags);
2501			if (err)
2502				goto out_unlock;
2503
2504			if (vxlan->cfg.df == VXLAN_DF_SET) {
2505				df = htons(IP_DF);
2506			} else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2507				struct ethhdr *eth = eth_hdr(skb);
2508
2509				if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2510				    (ntohs(eth->h_proto) == ETH_P_IP &&
2511				     old_iph->frag_off & htons(IP_DF)))
2512					df = htons(IP_DF);
2513			}
2514		} else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT,
2515				    info->key.tun_flags)) {
2516			df = htons(IP_DF);
2517		}
2518
2519		ndst = &rt->dst;
2520		err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE),
2521					    netif_is_any_bridge_port(dev));
2522		if (err < 0) {
2523			goto tx_error;
2524		} else if (err) {
2525			if (info) {
2526				struct ip_tunnel_info *unclone;
2527
2528				unclone = skb_tunnel_info_unclone(skb);
2529				if (unlikely(!unclone))
2530					goto tx_error;
2531
2532				unclone->key.u.ipv4.src = pkey->u.ipv4.dst;
2533				unclone->key.u.ipv4.dst = saddr;
2534			}
2535			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2536			dst_release(ndst);
2537			goto out_unlock;
2538		}
2539
2540		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2541		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2542		err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2543				      vni, md, flags, udp_sum);
2544		if (err < 0) {
2545			reason = SKB_DROP_REASON_NOMEM;
2546			goto tx_error;
2547		}
2548
2549		udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr,
2550				    pkey->u.ipv4.dst, tos, ttl, df,
2551				    src_port, dst_port, xnet, !udp_sum);
2552#if IS_ENABLED(CONFIG_IPV6)
2553	} else {
2554		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2555		struct in6_addr saddr;
2556
2557		if (!ifindex)
2558			ifindex = sock6->sock->sk->sk_bound_dev_if;
2559
2560		ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock,
2561					      ifindex, &saddr, pkey,
2562					      src_port, dst_port, tos,
2563					      use_cache ? dst_cache : NULL);
2564		if (IS_ERR(ndst)) {
2565			err = PTR_ERR(ndst);
2566			ndst = NULL;
2567			reason = SKB_DROP_REASON_IP_OUTNOROUTES;
2568			goto tx_error;
2569		}
2570
2571		if (!info) {
2572			u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags;
2573
2574			err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6,
2575						    dst_port, ifindex, vni,
2576						    ndst, rt6i_flags);
2577			if (err)
2578				goto out_unlock;
2579		}
2580
2581		err = skb_tunnel_check_pmtu(skb, ndst,
2582					    vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6),
2583					    netif_is_any_bridge_port(dev));
2584		if (err < 0) {
2585			goto tx_error;
2586		} else if (err) {
2587			if (info) {
2588				struct ip_tunnel_info *unclone;
2589
2590				unclone = skb_tunnel_info_unclone(skb);
2591				if (unlikely(!unclone))
2592					goto tx_error;
2593
2594				unclone->key.u.ipv6.src = pkey->u.ipv6.dst;
2595				unclone->key.u.ipv6.dst = saddr;
2596			}
2597
2598			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2599			dst_release(ndst);
2600			goto out_unlock;
2601		}
2602
2603		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2604		ttl = ttl ? : ip6_dst_hoplimit(ndst);
2605		skb_scrub_packet(skb, xnet);
2606		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2607				      vni, md, flags, udp_sum);
2608		if (err < 0) {
2609			reason = SKB_DROP_REASON_NOMEM;
2610			goto tx_error;
2611		}
2612
2613		udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2614				     &saddr, &pkey->u.ipv6.dst, tos, ttl,
2615				     pkey->label, src_port, dst_port, !udp_sum);
2616#endif
2617	}
2618	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len);
2619out_unlock:
2620	rcu_read_unlock();
2621	return;
2622
2623drop:
2624	dev_core_stats_tx_dropped_inc(dev);
2625	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
2626	kfree_skb_reason(skb, reason);
2627	return;
2628
2629tx_error:
2630	rcu_read_unlock();
2631	if (err == -ELOOP)
2632		DEV_STATS_INC(dev, collisions);
2633	else if (err == -ENETUNREACH)
2634		DEV_STATS_INC(dev, tx_carrier_errors);
2635	dst_release(ndst);
2636	DEV_STATS_INC(dev, tx_errors);
2637	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
2638	kfree_skb_reason(skb, reason);
2639}
2640
2641static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2642			  struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2643{
2644	struct vxlan_rdst nh_rdst;
2645	struct nexthop *nh;
2646	bool do_xmit;
2647	u32 hash;
2648
2649	memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2650	hash = skb_get_hash(skb);
2651
2652	rcu_read_lock();
2653	nh = rcu_dereference(f->nh);
2654	if (!nh) {
2655		rcu_read_unlock();
2656		goto drop;
2657	}
2658	do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2659	rcu_read_unlock();
2660
2661	if (likely(do_xmit))
2662		vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2663	else
2664		goto drop;
2665
2666	return;
2667
2668drop:
2669	dev_core_stats_tx_dropped_inc(dev);
2670	vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2671			      VXLAN_VNI_STATS_TX_DROPS, 0);
2672	dev_kfree_skb(skb);
2673}
2674
2675static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev,
2676				   u32 nhid, __be32 vni)
2677{
2678	struct vxlan_dev *vxlan = netdev_priv(dev);
2679	struct vxlan_rdst nh_rdst;
2680	struct nexthop *nh;
2681	bool do_xmit;
2682	u32 hash;
2683
2684	memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2685	hash = skb_get_hash(skb);
2686
2687	rcu_read_lock();
2688	nh = nexthop_find_by_id(dev_net(dev), nhid);
2689	if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) {
2690		rcu_read_unlock();
2691		goto drop;
2692	}
2693	do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2694	rcu_read_unlock();
2695
2696	if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family)
2697		goto drop;
2698
2699	if (likely(do_xmit))
2700		vxlan_xmit_one(skb, dev, vni, &nh_rdst, false);
2701	else
2702		goto drop;
2703
2704	return NETDEV_TX_OK;
2705
2706drop:
2707	dev_core_stats_tx_dropped_inc(dev);
2708	vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2709			      VXLAN_VNI_STATS_TX_DROPS, 0);
2710	dev_kfree_skb(skb);
2711	return NETDEV_TX_OK;
2712}
2713
2714/* Transmit local packets over Vxlan
2715 *
2716 * Outer IP header inherits ECN and DF from inner header.
2717 * Outer UDP destination is the VXLAN assigned port.
2718 *           source port is based on hash of flow
2719 */
2720static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2721{
2722	struct vxlan_dev *vxlan = netdev_priv(dev);
2723	struct vxlan_rdst *rdst, *fdst = NULL;
2724	const struct ip_tunnel_info *info;
 
2725	struct vxlan_fdb *f;
2726	struct ethhdr *eth;
2727	__be32 vni = 0;
2728	u32 nhid = 0;
2729	bool did_rsc;
2730
2731	info = skb_tunnel_info(skb);
2732
2733	skb_reset_mac_header(skb);
2734
2735	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2736		if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2737		    info->mode & IP_TUNNEL_INFO_TX) {
2738			vni = tunnel_id_to_key32(info->key.tun_id);
2739			nhid = info->key.nhid;
2740		} else {
2741			if (info && info->mode & IP_TUNNEL_INFO_TX)
2742				vxlan_xmit_one(skb, dev, vni, NULL, false);
2743			else
2744				kfree_skb_reason(skb, SKB_DROP_REASON_TUNNEL_TXINFO);
2745			return NETDEV_TX_OK;
2746		}
2747	}
2748
2749	if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2750		eth = eth_hdr(skb);
2751		if (ntohs(eth->h_proto) == ETH_P_ARP)
2752			return arp_reduce(dev, skb, vni);
2753#if IS_ENABLED(CONFIG_IPV6)
2754		else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2755			 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2756					    sizeof(struct nd_msg)) &&
2757			 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2758			struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2759
2760			if (m->icmph.icmp6_code == 0 &&
2761			    m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2762				return neigh_reduce(dev, skb, vni);
2763		}
2764#endif
2765	}
2766
2767	if (nhid)
2768		return vxlan_xmit_nhid(skb, dev, nhid, vni);
2769
2770	if (vxlan->cfg.flags & VXLAN_F_MDB) {
2771		struct vxlan_mdb_entry *mdb_entry;
2772
2773		rcu_read_lock();
2774		mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni);
2775		if (mdb_entry) {
2776			netdev_tx_t ret;
2777
2778			ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb);
2779			rcu_read_unlock();
2780			return ret;
2781		}
2782		rcu_read_unlock();
2783	}
2784
2785	eth = eth_hdr(skb);
2786	f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2787	did_rsc = false;
2788
2789	if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2790	    (ntohs(eth->h_proto) == ETH_P_IP ||
2791	     ntohs(eth->h_proto) == ETH_P_IPV6)) {
2792		did_rsc = route_shortcircuit(dev, skb);
2793		if (did_rsc)
2794			f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2795	}
2796
2797	if (f == NULL) {
2798		f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2799		if (f == NULL) {
2800			if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2801			    !is_multicast_ether_addr(eth->h_dest))
2802				vxlan_fdb_miss(vxlan, eth->h_dest);
2803
2804			dev_core_stats_tx_dropped_inc(dev);
2805			vxlan_vnifilter_count(vxlan, vni, NULL,
2806					      VXLAN_VNI_STATS_TX_DROPS, 0);
2807			kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_NO_REMOTE);
2808			return NETDEV_TX_OK;
2809		}
2810	}
2811
2812	if (rcu_access_pointer(f->nh)) {
2813		vxlan_xmit_nh(skb, dev, f,
2814			      (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2815	} else {
2816		list_for_each_entry_rcu(rdst, &f->remotes, list) {
2817			struct sk_buff *skb1;
2818
2819			if (!fdst) {
2820				fdst = rdst;
2821				continue;
2822			}
2823			skb1 = skb_clone(skb, GFP_ATOMIC);
2824			if (skb1)
2825				vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2826		}
2827		if (fdst)
2828			vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2829		else
2830			kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_NO_REMOTE);
2831	}
2832
2833	return NETDEV_TX_OK;
2834}
2835
2836/* Walk the forwarding table and purge stale entries */
2837static void vxlan_cleanup(struct timer_list *t)
2838{
2839	struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2840	unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2841	unsigned int h;
2842
2843	if (!netif_running(vxlan->dev))
2844		return;
2845
2846	for (h = 0; h < FDB_HASH_SIZE; ++h) {
2847		struct hlist_node *p, *n;
2848
2849		spin_lock(&vxlan->hash_lock[h]);
2850		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2851			struct vxlan_fdb *f
2852				= container_of(p, struct vxlan_fdb, hlist);
2853			unsigned long timeout;
2854
2855			if (f->state & (NUD_PERMANENT | NUD_NOARP))
2856				continue;
2857
2858			if (f->flags & NTF_EXT_LEARNED)
2859				continue;
2860
2861			timeout = f->used + vxlan->cfg.age_interval * HZ;
2862			if (time_before_eq(timeout, jiffies)) {
2863				netdev_dbg(vxlan->dev,
2864					   "garbage collect %pM\n",
2865					   f->eth_addr);
2866				f->state = NUD_STALE;
2867				vxlan_fdb_destroy(vxlan, f, true, true);
2868			} else if (time_before(timeout, next_timer))
2869				next_timer = timeout;
2870		}
2871		spin_unlock(&vxlan->hash_lock[h]);
2872	}
2873
2874	mod_timer(&vxlan->age_timer, next_timer);
2875}
2876
2877static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2878{
2879	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2880
2881	spin_lock(&vn->sock_lock);
2882	hlist_del_init_rcu(&vxlan->hlist4.hlist);
2883#if IS_ENABLED(CONFIG_IPV6)
2884	hlist_del_init_rcu(&vxlan->hlist6.hlist);
2885#endif
2886	spin_unlock(&vn->sock_lock);
2887}
2888
2889static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2890			     struct vxlan_dev_node *node)
2891{
2892	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2893	__be32 vni = vxlan->default_dst.remote_vni;
2894
2895	node->vxlan = vxlan;
2896	spin_lock(&vn->sock_lock);
2897	hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2898	spin_unlock(&vn->sock_lock);
2899}
2900
2901/* Setup stats when device is created */
2902static int vxlan_init(struct net_device *dev)
2903{
2904	struct vxlan_dev *vxlan = netdev_priv(dev);
2905	int err;
2906
2907	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
2908		err = vxlan_vnigroup_init(vxlan);
2909		if (err)
2910			return err;
2911	}
2912
2913	err = gro_cells_init(&vxlan->gro_cells, dev);
2914	if (err)
2915		goto err_vnigroup_uninit;
2916
2917	err = vxlan_mdb_init(vxlan);
2918	if (err)
2919		goto err_gro_cells_destroy;
2920
2921	netdev_lockdep_set_classes(dev);
2922	return 0;
2923
2924err_gro_cells_destroy:
2925	gro_cells_destroy(&vxlan->gro_cells);
2926err_vnigroup_uninit:
2927	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2928		vxlan_vnigroup_uninit(vxlan);
2929	return err;
2930}
2931
2932static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2933{
2934	struct vxlan_fdb *f;
2935	u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2936
2937	spin_lock_bh(&vxlan->hash_lock[hash_index]);
2938	f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2939	if (f)
2940		vxlan_fdb_destroy(vxlan, f, true, true);
2941	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2942}
2943
2944static void vxlan_uninit(struct net_device *dev)
2945{
2946	struct vxlan_dev *vxlan = netdev_priv(dev);
2947
2948	vxlan_mdb_fini(vxlan);
2949
2950	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2951		vxlan_vnigroup_uninit(vxlan);
2952
2953	gro_cells_destroy(&vxlan->gro_cells);
2954
2955	vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2956}
2957
2958/* Start ageing timer and join group when device is brought up */
2959static int vxlan_open(struct net_device *dev)
2960{
2961	struct vxlan_dev *vxlan = netdev_priv(dev);
2962	int ret;
2963
2964	ret = vxlan_sock_add(vxlan);
2965	if (ret < 0)
2966		return ret;
2967
2968	ret = vxlan_multicast_join(vxlan);
2969	if (ret) {
2970		vxlan_sock_release(vxlan);
2971		return ret;
2972	}
2973
2974	if (vxlan->cfg.age_interval)
2975		mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2976
2977	return ret;
2978}
2979
2980struct vxlan_fdb_flush_desc {
2981	bool				ignore_default_entry;
2982	unsigned long                   state;
2983	unsigned long			state_mask;
2984	unsigned long                   flags;
2985	unsigned long			flags_mask;
2986	__be32				src_vni;
2987	u32				nhid;
2988	__be32				vni;
2989	__be16				port;
2990	union vxlan_addr		dst_ip;
2991};
2992
2993static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f,
2994				       const struct vxlan_dev *vxlan)
2995{
2996	return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni;
2997}
2998
2999static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid)
3000{
3001	struct nexthop *nh = rtnl_dereference(f->nh);
3002
3003	return nh && nh->id == nhid;
3004}
3005
3006static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f,
3007				    const struct vxlan_dev *vxlan,
3008				    const struct vxlan_fdb_flush_desc *desc)
3009{
3010	if (desc->state_mask && (f->state & desc->state_mask) != desc->state)
3011		return false;
3012
3013	if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags)
3014		return false;
3015
3016	if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan))
3017		return false;
3018
3019	if (desc->src_vni && f->vni != desc->src_vni)
3020		return false;
3021
3022	if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid))
3023		return false;
3024
3025	return true;
3026}
3027
3028static bool
3029vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc)
3030{
3031	return desc->vni || desc->port || desc->dst_ip.sa.sa_family;
3032}
3033
3034static bool
3035vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc,
3036			       const struct vxlan_rdst *rd)
3037{
3038	if (desc->vni && rd->remote_vni != desc->vni)
3039		return false;
3040
3041	if (desc->port && rd->remote_port != desc->port)
3042		return false;
3043
3044	if (desc->dst_ip.sa.sa_family &&
3045	    !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip))
3046		return false;
3047
3048	return true;
3049}
3050
3051static void
3052vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan,
3053			      const struct vxlan_fdb_flush_desc *desc,
3054			      bool *p_destroy_fdb)
3055{
3056	bool remotes_flushed = false;
3057	struct vxlan_rdst *rd, *tmp;
3058
3059	list_for_each_entry_safe(rd, tmp, &f->remotes, list) {
3060		if (!vxlan_fdb_flush_remote_matches(desc, rd))
3061			continue;
3062
3063		vxlan_fdb_dst_destroy(vxlan, f, rd, true);
3064		remotes_flushed = true;
3065	}
3066
3067	*p_destroy_fdb = remotes_flushed && list_empty(&f->remotes);
3068}
3069
3070/* Purge the forwarding table */
3071static void vxlan_flush(struct vxlan_dev *vxlan,
3072			const struct vxlan_fdb_flush_desc *desc)
3073{
3074	bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc);
3075	unsigned int h;
3076
3077	for (h = 0; h < FDB_HASH_SIZE; ++h) {
3078		struct hlist_node *p, *n;
3079
3080		spin_lock_bh(&vxlan->hash_lock[h]);
3081		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3082			struct vxlan_fdb *f
3083				= container_of(p, struct vxlan_fdb, hlist);
3084
3085			if (!vxlan_fdb_flush_matches(f, vxlan, desc))
3086				continue;
3087
3088			if (match_remotes) {
3089				bool destroy_fdb = false;
3090
3091				vxlan_fdb_flush_match_remotes(f, vxlan, desc,
3092							      &destroy_fdb);
3093
3094				if (!destroy_fdb)
3095					continue;
3096			}
3097
3098			vxlan_fdb_destroy(vxlan, f, true, true);
3099		}
3100		spin_unlock_bh(&vxlan->hash_lock[h]);
3101	}
3102}
3103
3104static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = {
3105	[NDA_SRC_VNI]   = { .type = NLA_U32 },
3106	[NDA_NH_ID]	= { .type = NLA_U32 },
3107	[NDA_VNI]	= { .type = NLA_U32 },
3108	[NDA_PORT]	= { .type = NLA_U16 },
3109	[NDA_DST]	= NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr),
3110					   sizeof(struct in6_addr)),
3111	[NDA_NDM_STATE_MASK]	= { .type = NLA_U16 },
3112	[NDA_NDM_FLAGS_MASK]	= { .type = NLA_U8 },
3113};
3114
3115#define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF)
3116#define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP)
3117#define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \
3118					   NTF_ROUTER)
3119
3120static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev,
3121				 struct netlink_ext_ack *extack)
3122{
3123	struct vxlan_dev *vxlan = netdev_priv(dev);
3124	struct vxlan_fdb_flush_desc desc = {};
3125	struct ndmsg *ndm = nlmsg_data(nlh);
3126	struct nlattr *tb[NDA_MAX + 1];
3127	u8 ndm_flags;
3128	int err;
3129
3130	ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS;
3131
3132	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy,
3133			  extack);
3134	if (err)
3135		return err;
3136
3137	if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) {
3138		NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set");
3139		return -EINVAL;
3140	}
3141	if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) {
3142		NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set");
3143		return -EINVAL;
3144	}
3145
3146	desc.state = ndm->ndm_state;
3147	desc.flags = ndm_flags;
3148
3149	if (tb[NDA_NDM_STATE_MASK])
3150		desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]);
3151
3152	if (tb[NDA_NDM_FLAGS_MASK])
3153		desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]);
3154
3155	if (tb[NDA_SRC_VNI])
3156		desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
3157
3158	if (tb[NDA_NH_ID])
3159		desc.nhid = nla_get_u32(tb[NDA_NH_ID]);
3160
3161	if (tb[NDA_VNI])
3162		desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
3163
3164	if (tb[NDA_PORT])
3165		desc.port = nla_get_be16(tb[NDA_PORT]);
3166
3167	if (tb[NDA_DST]) {
3168		union vxlan_addr ip;
3169
3170		err = vxlan_nla_get_addr(&ip, tb[NDA_DST]);
3171		if (err) {
3172			NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST],
3173					    "Unsupported address family");
3174			return err;
3175		}
3176		desc.dst_ip = ip;
3177	}
3178
3179	vxlan_flush(vxlan, &desc);
3180
3181	return 0;
3182}
3183
3184/* Cleanup timer and forwarding table on shutdown */
3185static int vxlan_stop(struct net_device *dev)
3186{
3187	struct vxlan_dev *vxlan = netdev_priv(dev);
3188	struct vxlan_fdb_flush_desc desc = {
3189		/* Default entry is deleted at vxlan_uninit. */
3190		.ignore_default_entry = true,
3191		.state = 0,
3192		.state_mask = NUD_PERMANENT | NUD_NOARP,
3193	};
3194
3195	vxlan_multicast_leave(vxlan);
3196
3197	del_timer_sync(&vxlan->age_timer);
3198
3199	vxlan_flush(vxlan, &desc);
3200	vxlan_sock_release(vxlan);
3201
3202	return 0;
3203}
3204
3205/* Stub, nothing needs to be done. */
3206static void vxlan_set_multicast_list(struct net_device *dev)
3207{
3208}
3209
3210static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3211{
3212	struct vxlan_dev *vxlan = netdev_priv(dev);
3213	struct vxlan_rdst *dst = &vxlan->default_dst;
3214	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3215							 dst->remote_ifindex);
3216
3217	/* This check is different than dev->max_mtu, because it looks at
3218	 * the lowerdev->mtu, rather than the static dev->max_mtu
3219	 */
3220	if (lowerdev) {
3221		int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags);
3222		if (new_mtu > max_mtu)
3223			return -EINVAL;
3224	}
3225
3226	WRITE_ONCE(dev->mtu, new_mtu);
3227	return 0;
3228}
3229
3230static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3231{
3232	struct vxlan_dev *vxlan = netdev_priv(dev);
3233	struct ip_tunnel_info *info = skb_tunnel_info(skb);
3234	__be16 sport, dport;
3235
3236	sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3237				  vxlan->cfg.port_max, true);
3238	dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3239
3240	if (ip_tunnel_info_af(info) == AF_INET) {
3241		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3242		struct rtable *rt;
3243
3244		if (!sock4)
3245			return -EIO;
3246
3247		rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0,
3248					   &info->key.u.ipv4.src,
3249					   &info->key,
3250					   sport, dport, info->key.tos,
3251					   &info->dst_cache);
3252		if (IS_ERR(rt))
3253			return PTR_ERR(rt);
3254		ip_rt_put(rt);
3255	} else {
3256#if IS_ENABLED(CONFIG_IPV6)
3257		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3258		struct dst_entry *ndst;
3259
3260		if (!sock6)
3261			return -EIO;
3262
3263		ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock,
3264					      0, &info->key.u.ipv6.src,
3265					      &info->key,
3266					      sport, dport, info->key.tos,
3267					      &info->dst_cache);
3268		if (IS_ERR(ndst))
3269			return PTR_ERR(ndst);
3270		dst_release(ndst);
3271#else /* !CONFIG_IPV6 */
3272		return -EPFNOSUPPORT;
3273#endif
3274	}
3275	info->key.tp_src = sport;
3276	info->key.tp_dst = dport;
3277	return 0;
3278}
3279
3280static const struct net_device_ops vxlan_netdev_ether_ops = {
3281	.ndo_init		= vxlan_init,
3282	.ndo_uninit		= vxlan_uninit,
3283	.ndo_open		= vxlan_open,
3284	.ndo_stop		= vxlan_stop,
3285	.ndo_start_xmit		= vxlan_xmit,
3286	.ndo_set_rx_mode	= vxlan_set_multicast_list,
3287	.ndo_change_mtu		= vxlan_change_mtu,
3288	.ndo_validate_addr	= eth_validate_addr,
3289	.ndo_set_mac_address	= eth_mac_addr,
3290	.ndo_fdb_add		= vxlan_fdb_add,
3291	.ndo_fdb_del		= vxlan_fdb_delete,
3292	.ndo_fdb_del_bulk	= vxlan_fdb_delete_bulk,
3293	.ndo_fdb_dump		= vxlan_fdb_dump,
3294	.ndo_fdb_get		= vxlan_fdb_get,
3295	.ndo_mdb_add		= vxlan_mdb_add,
3296	.ndo_mdb_del		= vxlan_mdb_del,
3297	.ndo_mdb_del_bulk	= vxlan_mdb_del_bulk,
3298	.ndo_mdb_dump		= vxlan_mdb_dump,
3299	.ndo_mdb_get		= vxlan_mdb_get,
3300	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
3301};
3302
3303static const struct net_device_ops vxlan_netdev_raw_ops = {
3304	.ndo_init		= vxlan_init,
3305	.ndo_uninit		= vxlan_uninit,
3306	.ndo_open		= vxlan_open,
3307	.ndo_stop		= vxlan_stop,
3308	.ndo_start_xmit		= vxlan_xmit,
3309	.ndo_change_mtu		= vxlan_change_mtu,
3310	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
3311};
3312
3313/* Info for udev, that this is a virtual tunnel endpoint */
3314static const struct device_type vxlan_type = {
3315	.name = "vxlan",
3316};
3317
3318/* Calls the ndo_udp_tunnel_add of the caller in order to
3319 * supply the listening VXLAN udp ports. Callers are expected
3320 * to implement the ndo_udp_tunnel_add.
3321 */
3322static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3323{
3324	struct vxlan_sock *vs;
3325	struct net *net = dev_net(dev);
3326	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3327	unsigned int i;
3328
3329	spin_lock(&vn->sock_lock);
3330	for (i = 0; i < PORT_HASH_SIZE; ++i) {
3331		hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3332			unsigned short type;
3333
3334			if (vs->flags & VXLAN_F_GPE)
3335				type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3336			else
3337				type = UDP_TUNNEL_TYPE_VXLAN;
3338
3339			if (push)
3340				udp_tunnel_push_rx_port(dev, vs->sock, type);
3341			else
3342				udp_tunnel_drop_rx_port(dev, vs->sock, type);
3343		}
3344	}
3345	spin_unlock(&vn->sock_lock);
3346}
3347
3348/* Initialize the device structure. */
3349static void vxlan_setup(struct net_device *dev)
3350{
3351	struct vxlan_dev *vxlan = netdev_priv(dev);
3352	unsigned int h;
3353
3354	eth_hw_addr_random(dev);
3355	ether_setup(dev);
3356
3357	dev->needs_free_netdev = true;
3358	SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3359
 
3360	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3361	dev->features   |= NETIF_F_RXCSUM;
3362	dev->features   |= NETIF_F_GSO_SOFTWARE;
3363
3364	dev->vlan_features = dev->features;
3365	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3366	dev->hw_features |= NETIF_F_RXCSUM;
3367	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3368	netif_keep_dst(dev);
3369	dev->priv_flags |= IFF_NO_QUEUE;
3370	dev->change_proto_down = true;
3371	dev->lltx = true;
3372
3373	/* MTU range: 68 - 65535 */
3374	dev->min_mtu = ETH_MIN_MTU;
3375	dev->max_mtu = ETH_MAX_MTU;
3376
3377	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
3378	INIT_LIST_HEAD(&vxlan->next);
3379
3380	timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3381
3382	vxlan->dev = dev;
3383
3384	for (h = 0; h < FDB_HASH_SIZE; ++h) {
3385		spin_lock_init(&vxlan->hash_lock[h]);
3386		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3387	}
3388}
3389
3390static void vxlan_ether_setup(struct net_device *dev)
3391{
3392	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3393	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3394	dev->netdev_ops = &vxlan_netdev_ether_ops;
3395}
3396
3397static void vxlan_raw_setup(struct net_device *dev)
3398{
3399	dev->header_ops = NULL;
3400	dev->type = ARPHRD_NONE;
3401	dev->hard_header_len = 0;
3402	dev->addr_len = 0;
3403	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3404	dev->netdev_ops = &vxlan_netdev_raw_ops;
3405}
3406
3407static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3408	[IFLA_VXLAN_UNSPEC]     = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS },
3409	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
3410	[IFLA_VXLAN_GROUP]	= { .len = sizeof_field(struct iphdr, daddr) },
3411	[IFLA_VXLAN_GROUP6]	= { .len = sizeof(struct in6_addr) },
3412	[IFLA_VXLAN_LINK]	= { .type = NLA_U32 },
3413	[IFLA_VXLAN_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
3414	[IFLA_VXLAN_LOCAL6]	= { .len = sizeof(struct in6_addr) },
3415	[IFLA_VXLAN_TOS]	= { .type = NLA_U8 },
3416	[IFLA_VXLAN_TTL]	= { .type = NLA_U8 },
3417	[IFLA_VXLAN_LABEL]	= { .type = NLA_U32 },
3418	[IFLA_VXLAN_LEARNING]	= { .type = NLA_U8 },
3419	[IFLA_VXLAN_AGEING]	= { .type = NLA_U32 },
3420	[IFLA_VXLAN_LIMIT]	= { .type = NLA_U32 },
3421	[IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3422	[IFLA_VXLAN_PROXY]	= { .type = NLA_U8 },
3423	[IFLA_VXLAN_RSC]	= { .type = NLA_U8 },
3424	[IFLA_VXLAN_L2MISS]	= { .type = NLA_U8 },
3425	[IFLA_VXLAN_L3MISS]	= { .type = NLA_U8 },
3426	[IFLA_VXLAN_COLLECT_METADATA]	= { .type = NLA_U8 },
3427	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
3428	[IFLA_VXLAN_UDP_CSUM]	= { .type = NLA_U8 },
3429	[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
3430	[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
3431	[IFLA_VXLAN_REMCSUM_TX]	= { .type = NLA_U8 },
3432	[IFLA_VXLAN_REMCSUM_RX]	= { .type = NLA_U8 },
3433	[IFLA_VXLAN_GBP]	= { .type = NLA_FLAG, },
3434	[IFLA_VXLAN_GPE]	= { .type = NLA_FLAG, },
3435	[IFLA_VXLAN_REMCSUM_NOPARTIAL]	= { .type = NLA_FLAG },
3436	[IFLA_VXLAN_TTL_INHERIT]	= { .type = NLA_FLAG },
3437	[IFLA_VXLAN_DF]		= { .type = NLA_U8 },
3438	[IFLA_VXLAN_VNIFILTER]	= { .type = NLA_U8 },
3439	[IFLA_VXLAN_LOCALBYPASS]	= NLA_POLICY_MAX(NLA_U8, 1),
3440	[IFLA_VXLAN_LABEL_POLICY]       = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX),
3441};
3442
3443static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3444			  struct netlink_ext_ack *extack)
3445{
3446	if (tb[IFLA_ADDRESS]) {
3447		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3448			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3449					    "Provided link layer address is not Ethernet");
3450			return -EINVAL;
3451		}
3452
3453		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3454			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3455					    "Provided Ethernet address is not unicast");
3456			return -EADDRNOTAVAIL;
3457		}
3458	}
3459
3460	if (tb[IFLA_MTU]) {
3461		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3462
3463		if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3464			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3465					    "MTU must be between 68 and 65535");
3466			return -EINVAL;
3467		}
3468	}
3469
3470	if (!data) {
3471		NL_SET_ERR_MSG(extack,
3472			       "Required attributes not provided to perform the operation");
3473		return -EINVAL;
3474	}
3475
3476	if (data[IFLA_VXLAN_ID]) {
3477		u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3478
3479		if (id >= VXLAN_N_VID) {
3480			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3481					    "VXLAN ID must be lower than 16777216");
3482			return -ERANGE;
3483		}
3484	}
3485
3486	if (data[IFLA_VXLAN_PORT_RANGE]) {
3487		const struct ifla_vxlan_port_range *p
3488			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3489
3490		if (ntohs(p->high) < ntohs(p->low)) {
3491			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3492					    "Invalid source port range");
3493			return -EINVAL;
3494		}
3495	}
3496
3497	if (data[IFLA_VXLAN_DF]) {
3498		enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3499
3500		if (df < 0 || df > VXLAN_DF_MAX) {
3501			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3502					    "Invalid DF attribute");
3503			return -EINVAL;
3504		}
3505	}
3506
3507	return 0;
3508}
3509
3510static void vxlan_get_drvinfo(struct net_device *netdev,
3511			      struct ethtool_drvinfo *drvinfo)
3512{
3513	strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3514	strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3515}
3516
3517static int vxlan_get_link_ksettings(struct net_device *dev,
3518				    struct ethtool_link_ksettings *cmd)
3519{
3520	struct vxlan_dev *vxlan = netdev_priv(dev);
3521	struct vxlan_rdst *dst = &vxlan->default_dst;
3522	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3523							 dst->remote_ifindex);
3524
3525	if (!lowerdev) {
3526		cmd->base.duplex = DUPLEX_UNKNOWN;
3527		cmd->base.port = PORT_OTHER;
3528		cmd->base.speed = SPEED_UNKNOWN;
3529
3530		return 0;
3531	}
3532
3533	return __ethtool_get_link_ksettings(lowerdev, cmd);
3534}
3535
3536static const struct ethtool_ops vxlan_ethtool_ops = {
3537	.get_drvinfo		= vxlan_get_drvinfo,
3538	.get_link		= ethtool_op_get_link,
3539	.get_link_ksettings	= vxlan_get_link_ksettings,
3540};
3541
3542static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3543					__be16 port, u32 flags, int ifindex)
3544{
3545	struct socket *sock;
3546	struct udp_port_cfg udp_conf;
3547	int err;
3548
3549	memset(&udp_conf, 0, sizeof(udp_conf));
3550
3551	if (ipv6) {
3552		udp_conf.family = AF_INET6;
3553		udp_conf.use_udp6_rx_checksums =
3554		    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3555		udp_conf.ipv6_v6only = 1;
3556	} else {
3557		udp_conf.family = AF_INET;
3558	}
3559
3560	udp_conf.local_udp_port = port;
3561	udp_conf.bind_ifindex = ifindex;
3562
3563	/* Open UDP socket */
3564	err = udp_sock_create(net, &udp_conf, &sock);
3565	if (err < 0)
3566		return ERR_PTR(err);
3567
3568	udp_allow_gso(sock->sk);
3569	return sock;
3570}
3571
3572/* Create new listen socket if needed */
3573static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3574					      __be16 port, u32 flags,
3575					      int ifindex)
3576{
3577	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3578	struct vxlan_sock *vs;
3579	struct socket *sock;
3580	unsigned int h;
3581	struct udp_tunnel_sock_cfg tunnel_cfg;
3582
3583	vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3584	if (!vs)
3585		return ERR_PTR(-ENOMEM);
3586
3587	for (h = 0; h < VNI_HASH_SIZE; ++h)
3588		INIT_HLIST_HEAD(&vs->vni_list[h]);
3589
3590	sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3591	if (IS_ERR(sock)) {
3592		kfree(vs);
3593		return ERR_CAST(sock);
3594	}
3595
3596	vs->sock = sock;
3597	refcount_set(&vs->refcnt, 1);
3598	vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3599
3600	spin_lock(&vn->sock_lock);
3601	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3602	udp_tunnel_notify_add_rx_port(sock,
3603				      (vs->flags & VXLAN_F_GPE) ?
3604				      UDP_TUNNEL_TYPE_VXLAN_GPE :
3605				      UDP_TUNNEL_TYPE_VXLAN);
3606	spin_unlock(&vn->sock_lock);
3607
3608	/* Mark socket as an encapsulation socket. */
3609	memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3610	tunnel_cfg.sk_user_data = vs;
3611	tunnel_cfg.encap_type = 1;
3612	tunnel_cfg.encap_rcv = vxlan_rcv;
3613	tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3614	tunnel_cfg.encap_destroy = NULL;
3615	if (vs->flags & VXLAN_F_GPE) {
3616		tunnel_cfg.gro_receive = vxlan_gpe_gro_receive;
3617		tunnel_cfg.gro_complete = vxlan_gpe_gro_complete;
3618	} else {
3619		tunnel_cfg.gro_receive = vxlan_gro_receive;
3620		tunnel_cfg.gro_complete = vxlan_gro_complete;
3621	}
3622
3623	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3624
3625	return vs;
3626}
3627
3628static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3629{
3630	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3631	bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3632	struct vxlan_sock *vs = NULL;
3633	struct vxlan_dev_node *node;
3634	int l3mdev_index = 0;
3635
3636	if (vxlan->cfg.remote_ifindex)
3637		l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3638			vxlan->net, vxlan->cfg.remote_ifindex);
3639
3640	if (!vxlan->cfg.no_share) {
3641		spin_lock(&vn->sock_lock);
3642		vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3643				     vxlan->cfg.dst_port, vxlan->cfg.flags,
3644				     l3mdev_index);
3645		if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3646			spin_unlock(&vn->sock_lock);
3647			return -EBUSY;
3648		}
3649		spin_unlock(&vn->sock_lock);
3650	}
3651	if (!vs)
3652		vs = vxlan_socket_create(vxlan->net, ipv6,
3653					 vxlan->cfg.dst_port, vxlan->cfg.flags,
3654					 l3mdev_index);
3655	if (IS_ERR(vs))
3656		return PTR_ERR(vs);
3657#if IS_ENABLED(CONFIG_IPV6)
3658	if (ipv6) {
3659		rcu_assign_pointer(vxlan->vn6_sock, vs);
3660		node = &vxlan->hlist6;
3661	} else
3662#endif
3663	{
3664		rcu_assign_pointer(vxlan->vn4_sock, vs);
3665		node = &vxlan->hlist4;
3666	}
3667
3668	if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER))
3669		vxlan_vs_add_vnigrp(vxlan, vs, ipv6);
3670	else
3671		vxlan_vs_add_dev(vs, vxlan, node);
3672
3673	return 0;
3674}
3675
3676static int vxlan_sock_add(struct vxlan_dev *vxlan)
3677{
3678	bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3679	bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3680	bool ipv4 = !ipv6 || metadata;
3681	int ret = 0;
3682
3683	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3684#if IS_ENABLED(CONFIG_IPV6)
3685	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3686	if (ipv6) {
3687		ret = __vxlan_sock_add(vxlan, true);
3688		if (ret < 0 && ret != -EAFNOSUPPORT)
3689			ipv4 = false;
3690	}
3691#endif
3692	if (ipv4)
3693		ret = __vxlan_sock_add(vxlan, false);
3694	if (ret < 0)
3695		vxlan_sock_release(vxlan);
3696	return ret;
3697}
3698
3699int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
3700		     struct vxlan_config *conf, __be32 vni)
3701{
3702	struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3703	struct vxlan_dev *tmp;
3704
3705	list_for_each_entry(tmp, &vn->vxlan_list, next) {
3706		if (tmp == vxlan)
3707			continue;
3708		if (tmp->cfg.flags & VXLAN_F_VNIFILTER) {
3709			if (!vxlan_vnifilter_lookup(tmp, vni))
3710				continue;
3711		} else if (tmp->cfg.vni != vni) {
3712			continue;
3713		}
3714		if (tmp->cfg.dst_port != conf->dst_port)
3715			continue;
3716		if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3717		    (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3718			continue;
3719
3720		if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3721		    tmp->cfg.remote_ifindex != conf->remote_ifindex)
3722			continue;
3723
3724		return -EEXIST;
3725	}
3726
3727	return 0;
3728}
3729
3730static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3731				 struct net_device **lower,
3732				 struct vxlan_dev *old,
3733				 struct netlink_ext_ack *extack)
3734{
3735	bool use_ipv6 = false;
3736
3737	if (conf->flags & VXLAN_F_GPE) {
3738		/* For now, allow GPE only together with
3739		 * COLLECT_METADATA. This can be relaxed later; in such
3740		 * case, the other side of the PtP link will have to be
3741		 * provided.
3742		 */
3743		if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3744		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3745			NL_SET_ERR_MSG(extack,
3746				       "VXLAN GPE does not support this combination of attributes");
3747			return -EINVAL;
3748		}
3749	}
3750
3751	if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3752		/* Unless IPv6 is explicitly requested, assume IPv4 */
3753		conf->remote_ip.sa.sa_family = AF_INET;
3754		conf->saddr.sa.sa_family = AF_INET;
3755	} else if (!conf->remote_ip.sa.sa_family) {
3756		conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3757	} else if (!conf->saddr.sa.sa_family) {
3758		conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3759	}
3760
3761	if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3762		NL_SET_ERR_MSG(extack,
3763			       "Local and remote address must be from the same family");
3764		return -EINVAL;
3765	}
3766
3767	if (vxlan_addr_multicast(&conf->saddr)) {
3768		NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3769		return -EINVAL;
3770	}
3771
3772	if (conf->saddr.sa.sa_family == AF_INET6) {
3773		if (!IS_ENABLED(CONFIG_IPV6)) {
3774			NL_SET_ERR_MSG(extack,
3775				       "IPv6 support not enabled in the kernel");
3776			return -EPFNOSUPPORT;
3777		}
3778		use_ipv6 = true;
3779		conf->flags |= VXLAN_F_IPV6;
3780
3781		if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3782			int local_type =
3783				ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3784			int remote_type =
3785				ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3786
3787			if (local_type & IPV6_ADDR_LINKLOCAL) {
3788				if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3789				    (remote_type != IPV6_ADDR_ANY)) {
3790					NL_SET_ERR_MSG(extack,
3791						       "Invalid combination of local and remote address scopes");
3792					return -EINVAL;
3793				}
3794
3795				conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3796			} else {
3797				if (remote_type ==
3798				    (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3799					NL_SET_ERR_MSG(extack,
3800						       "Invalid combination of local and remote address scopes");
3801					return -EINVAL;
3802				}
3803
3804				conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3805			}
3806		}
3807	}
3808
3809	if (conf->label && !use_ipv6) {
3810		NL_SET_ERR_MSG(extack,
3811			       "Label attribute only applies to IPv6 VXLAN devices");
3812		return -EINVAL;
3813	}
3814
3815	if (conf->label_policy && !use_ipv6) {
3816		NL_SET_ERR_MSG(extack,
3817			       "Label policy only applies to IPv6 VXLAN devices");
3818		return -EINVAL;
3819	}
3820
3821	if (conf->remote_ifindex) {
3822		struct net_device *lowerdev;
3823
3824		lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3825		if (!lowerdev) {
3826			NL_SET_ERR_MSG(extack,
3827				       "Invalid local interface, device not found");
3828			return -ENODEV;
3829		}
3830
3831#if IS_ENABLED(CONFIG_IPV6)
3832		if (use_ipv6) {
3833			struct inet6_dev *idev = __in6_dev_get(lowerdev);
3834
3835			if (idev && idev->cnf.disable_ipv6) {
3836				NL_SET_ERR_MSG(extack,
3837					       "IPv6 support disabled by administrator");
3838				return -EPERM;
3839			}
3840		}
3841#endif
3842
3843		*lower = lowerdev;
3844	} else {
3845		if (vxlan_addr_multicast(&conf->remote_ip)) {
3846			NL_SET_ERR_MSG(extack,
3847				       "Local interface required for multicast remote destination");
3848
3849			return -EINVAL;
3850		}
3851
3852#if IS_ENABLED(CONFIG_IPV6)
3853		if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3854			NL_SET_ERR_MSG(extack,
3855				       "Local interface required for link-local local/remote addresses");
3856			return -EINVAL;
3857		}
3858#endif
3859
3860		*lower = NULL;
3861	}
3862
3863	if (!conf->dst_port) {
3864		if (conf->flags & VXLAN_F_GPE)
3865			conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
3866		else
3867			conf->dst_port = htons(vxlan_port);
3868	}
3869
3870	if (!conf->age_interval)
3871		conf->age_interval = FDB_AGE_DEFAULT;
3872
3873	if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) {
3874		NL_SET_ERR_MSG(extack,
3875			       "A VXLAN device with the specified VNI already exists");
3876		return -EEXIST;
3877	}
3878
3879	return 0;
3880}
3881
3882static void vxlan_config_apply(struct net_device *dev,
3883			       struct vxlan_config *conf,
3884			       struct net_device *lowerdev,
3885			       struct net *src_net,
3886			       bool changelink)
3887{
3888	struct vxlan_dev *vxlan = netdev_priv(dev);
3889	struct vxlan_rdst *dst = &vxlan->default_dst;
3890	unsigned short needed_headroom = ETH_HLEN;
3891	int max_mtu = ETH_MAX_MTU;
3892	u32 flags = conf->flags;
3893
3894	if (!changelink) {
3895		if (flags & VXLAN_F_GPE)
3896			vxlan_raw_setup(dev);
3897		else
3898			vxlan_ether_setup(dev);
3899
3900		if (conf->mtu)
3901			dev->mtu = conf->mtu;
3902
3903		vxlan->net = src_net;
3904	}
3905
3906	dst->remote_vni = conf->vni;
3907
3908	memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3909
3910	if (lowerdev) {
3911		dst->remote_ifindex = conf->remote_ifindex;
3912
3913		netif_inherit_tso_max(dev, lowerdev);
3914
3915		needed_headroom = lowerdev->hard_header_len;
3916		needed_headroom += lowerdev->needed_headroom;
3917
3918		dev->needed_tailroom = lowerdev->needed_tailroom;
3919
3920		max_mtu = lowerdev->mtu - vxlan_headroom(flags);
3921		if (max_mtu < ETH_MIN_MTU)
3922			max_mtu = ETH_MIN_MTU;
3923
3924		if (!changelink && !conf->mtu)
3925			dev->mtu = max_mtu;
3926	}
3927
3928	if (dev->mtu > max_mtu)
3929		dev->mtu = max_mtu;
3930
3931	if (flags & VXLAN_F_COLLECT_METADATA)
3932		flags |= VXLAN_F_IPV6;
3933	needed_headroom += vxlan_headroom(flags);
3934	dev->needed_headroom = needed_headroom;
3935
3936	memcpy(&vxlan->cfg, conf, sizeof(*conf));
3937}
3938
3939static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3940			       struct vxlan_config *conf, bool changelink,
3941			       struct netlink_ext_ack *extack)
3942{
3943	struct vxlan_dev *vxlan = netdev_priv(dev);
3944	struct net_device *lowerdev;
3945	int ret;
3946
3947	ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3948	if (ret)
3949		return ret;
3950
3951	vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3952
3953	return 0;
3954}
3955
3956static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3957			      struct vxlan_config *conf,
3958			      struct netlink_ext_ack *extack)
3959{
3960	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3961	struct vxlan_dev *vxlan = netdev_priv(dev);
3962	struct net_device *remote_dev = NULL;
3963	struct vxlan_fdb *f = NULL;
3964	bool unregister = false;
3965	struct vxlan_rdst *dst;
3966	int err;
3967
3968	dst = &vxlan->default_dst;
3969	err = vxlan_dev_configure(net, dev, conf, false, extack);
3970	if (err)
3971		return err;
3972
3973	dev->ethtool_ops = &vxlan_ethtool_ops;
3974
3975	/* create an fdb entry for a valid default destination */
3976	if (!vxlan_addr_any(&dst->remote_ip)) {
3977		err = vxlan_fdb_create(vxlan, all_zeros_mac,
3978				       &dst->remote_ip,
3979				       NUD_REACHABLE | NUD_PERMANENT,
3980				       vxlan->cfg.dst_port,
3981				       dst->remote_vni,
3982				       dst->remote_vni,
3983				       dst->remote_ifindex,
3984				       NTF_SELF, 0, &f, extack);
3985		if (err)
3986			return err;
3987	}
3988
3989	err = register_netdevice(dev);
3990	if (err)
3991		goto errout;
3992	unregister = true;
3993
3994	if (dst->remote_ifindex) {
3995		remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3996		if (!remote_dev) {
3997			err = -ENODEV;
3998			goto errout;
3999		}
4000
4001		err = netdev_upper_dev_link(remote_dev, dev, extack);
4002		if (err)
4003			goto errout;
4004	}
4005
4006	err = rtnl_configure_link(dev, NULL, 0, NULL);
4007	if (err < 0)
4008		goto unlink;
4009
4010	if (f) {
4011		vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
4012
4013		/* notify default fdb entry */
4014		err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
4015				       RTM_NEWNEIGH, true, extack);
4016		if (err) {
4017			vxlan_fdb_destroy(vxlan, f, false, false);
4018			if (remote_dev)
4019				netdev_upper_dev_unlink(remote_dev, dev);
4020			goto unregister;
4021		}
4022	}
4023
4024	list_add(&vxlan->next, &vn->vxlan_list);
4025	if (remote_dev)
4026		dst->remote_dev = remote_dev;
4027	return 0;
4028unlink:
4029	if (remote_dev)
4030		netdev_upper_dev_unlink(remote_dev, dev);
4031errout:
4032	/* unregister_netdevice() destroys the default FDB entry with deletion
4033	 * notification. But the addition notification was not sent yet, so
4034	 * destroy the entry by hand here.
4035	 */
4036	if (f)
4037		__vxlan_fdb_free(f);
4038unregister:
4039	if (unregister)
4040		unregister_netdevice(dev);
4041	return err;
4042}
4043
4044/* Set/clear flags based on attribute */
4045static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
4046			  int attrtype, unsigned long mask, bool changelink,
4047			  bool changelink_supported,
4048			  struct netlink_ext_ack *extack)
4049{
4050	unsigned long flags;
4051
4052	if (!tb[attrtype])
4053		return 0;
4054
4055	if (changelink && !changelink_supported) {
4056		vxlan_flag_attr_error(attrtype, extack);
4057		return -EOPNOTSUPP;
4058	}
4059
4060	if (vxlan_policy[attrtype].type == NLA_FLAG)
4061		flags = conf->flags | mask;
4062	else if (nla_get_u8(tb[attrtype]))
4063		flags = conf->flags | mask;
4064	else
4065		flags = conf->flags & ~mask;
4066
4067	conf->flags = flags;
4068
4069	return 0;
4070}
4071
4072static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
4073			 struct net_device *dev, struct vxlan_config *conf,
4074			 bool changelink, struct netlink_ext_ack *extack)
4075{
4076	struct vxlan_dev *vxlan = netdev_priv(dev);
4077	int err = 0;
4078
4079	memset(conf, 0, sizeof(*conf));
4080
4081	/* if changelink operation, start with old existing cfg */
4082	if (changelink)
4083		memcpy(conf, &vxlan->cfg, sizeof(*conf));
4084
4085	if (data[IFLA_VXLAN_ID]) {
4086		__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
4087
4088		if (changelink && (vni != conf->vni)) {
4089			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
4090			return -EOPNOTSUPP;
4091		}
4092		conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
4093	}
4094
4095	if (data[IFLA_VXLAN_GROUP]) {
4096		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
4097			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
4098			return -EOPNOTSUPP;
4099		}
4100
4101		conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
4102		conf->remote_ip.sa.sa_family = AF_INET;
4103	} else if (data[IFLA_VXLAN_GROUP6]) {
4104		if (!IS_ENABLED(CONFIG_IPV6)) {
4105			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
4106			return -EPFNOSUPPORT;
4107		}
4108
4109		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
4110			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
4111			return -EOPNOTSUPP;
4112		}
4113
4114		conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
4115		conf->remote_ip.sa.sa_family = AF_INET6;
4116	}
4117
4118	if (data[IFLA_VXLAN_LOCAL]) {
4119		if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
4120			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
4121			return -EOPNOTSUPP;
4122		}
4123
4124		conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
4125		conf->saddr.sa.sa_family = AF_INET;
4126	} else if (data[IFLA_VXLAN_LOCAL6]) {
4127		if (!IS_ENABLED(CONFIG_IPV6)) {
4128			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
4129			return -EPFNOSUPPORT;
4130		}
4131
4132		if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
4133			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
4134			return -EOPNOTSUPP;
4135		}
4136
4137		/* TODO: respect scope id */
4138		conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
4139		conf->saddr.sa.sa_family = AF_INET6;
4140	}
4141
4142	if (data[IFLA_VXLAN_LINK])
4143		conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
4144
4145	if (data[IFLA_VXLAN_TOS])
4146		conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
4147
4148	if (data[IFLA_VXLAN_TTL])
4149		conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4150
4151	if (data[IFLA_VXLAN_TTL_INHERIT]) {
4152		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4153				    VXLAN_F_TTL_INHERIT, changelink, false,
4154				    extack);
4155		if (err)
4156			return err;
4157
4158	}
4159
4160	if (data[IFLA_VXLAN_LABEL])
4161		conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4162			     IPV6_FLOWLABEL_MASK;
4163	if (data[IFLA_VXLAN_LABEL_POLICY])
4164		conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]);
4165
4166	if (data[IFLA_VXLAN_LEARNING]) {
4167		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4168				    VXLAN_F_LEARN, changelink, true,
4169				    extack);
4170		if (err)
4171			return err;
4172	} else if (!changelink) {
4173		/* default to learn on a new device */
4174		conf->flags |= VXLAN_F_LEARN;
4175	}
4176
4177	if (data[IFLA_VXLAN_AGEING])
4178		conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4179
4180	if (data[IFLA_VXLAN_PROXY]) {
4181		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4182				    VXLAN_F_PROXY, changelink, false,
4183				    extack);
4184		if (err)
4185			return err;
4186	}
4187
4188	if (data[IFLA_VXLAN_RSC]) {
4189		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4190				    VXLAN_F_RSC, changelink, false,
4191				    extack);
4192		if (err)
4193			return err;
4194	}
4195
4196	if (data[IFLA_VXLAN_L2MISS]) {
4197		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4198				    VXLAN_F_L2MISS, changelink, false,
4199				    extack);
4200		if (err)
4201			return err;
4202	}
4203
4204	if (data[IFLA_VXLAN_L3MISS]) {
4205		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4206				    VXLAN_F_L3MISS, changelink, false,
4207				    extack);
4208		if (err)
4209			return err;
4210	}
4211
4212	if (data[IFLA_VXLAN_LIMIT]) {
4213		if (changelink) {
4214			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4215					    "Cannot change limit");
4216			return -EOPNOTSUPP;
4217		}
4218		conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4219	}
4220
4221	if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4222		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4223				    VXLAN_F_COLLECT_METADATA, changelink, false,
4224				    extack);
4225		if (err)
4226			return err;
4227	}
4228
4229	if (data[IFLA_VXLAN_PORT_RANGE]) {
4230		if (!changelink) {
4231			const struct ifla_vxlan_port_range *p
4232				= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4233			conf->port_min = ntohs(p->low);
4234			conf->port_max = ntohs(p->high);
4235		} else {
4236			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4237					    "Cannot change port range");
4238			return -EOPNOTSUPP;
4239		}
4240	}
4241
4242	if (data[IFLA_VXLAN_PORT]) {
4243		if (changelink) {
4244			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4245					    "Cannot change port");
4246			return -EOPNOTSUPP;
4247		}
4248		conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4249	}
4250
4251	if (data[IFLA_VXLAN_UDP_CSUM]) {
4252		if (changelink) {
4253			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4254					    "Cannot change UDP_CSUM flag");
4255			return -EOPNOTSUPP;
4256		}
4257		if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4258			conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4259	}
4260
4261	if (data[IFLA_VXLAN_LOCALBYPASS]) {
4262		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS,
4263				    VXLAN_F_LOCALBYPASS, changelink,
4264				    true, extack);
4265		if (err)
4266			return err;
4267	} else if (!changelink) {
4268		/* default to local bypass on a new device */
4269		conf->flags |= VXLAN_F_LOCALBYPASS;
4270	}
4271
4272	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4273		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4274				    VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4275				    false, extack);
4276		if (err)
4277			return err;
4278	}
4279
4280	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4281		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4282				    VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4283				    false, extack);
4284		if (err)
4285			return err;
4286	}
4287
4288	if (data[IFLA_VXLAN_REMCSUM_TX]) {
4289		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4290				    VXLAN_F_REMCSUM_TX, changelink, false,
4291				    extack);
4292		if (err)
4293			return err;
4294	}
4295
4296	if (data[IFLA_VXLAN_REMCSUM_RX]) {
4297		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4298				    VXLAN_F_REMCSUM_RX, changelink, false,
4299				    extack);
4300		if (err)
4301			return err;
4302	}
4303
4304	if (data[IFLA_VXLAN_GBP]) {
4305		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4306				    VXLAN_F_GBP, changelink, false, extack);
4307		if (err)
4308			return err;
4309	}
4310
4311	if (data[IFLA_VXLAN_GPE]) {
4312		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4313				    VXLAN_F_GPE, changelink, false,
4314				    extack);
4315		if (err)
4316			return err;
4317	}
4318
4319	if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4320		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4321				    VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4322				    false, extack);
4323		if (err)
4324			return err;
4325	}
4326
4327	if (tb[IFLA_MTU]) {
4328		if (changelink) {
4329			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4330					    "Cannot change mtu");
4331			return -EOPNOTSUPP;
4332		}
4333		conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4334	}
4335
4336	if (data[IFLA_VXLAN_DF])
4337		conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4338
4339	if (data[IFLA_VXLAN_VNIFILTER]) {
4340		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER,
4341				    VXLAN_F_VNIFILTER, changelink, false,
4342				    extack);
4343		if (err)
4344			return err;
4345
4346		if ((conf->flags & VXLAN_F_VNIFILTER) &&
4347		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
4348			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER],
4349					    "vxlan vnifilter only valid in collect metadata mode");
4350			return -EINVAL;
4351		}
4352	}
4353
4354	return 0;
4355}
4356
4357static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4358			 struct nlattr *tb[], struct nlattr *data[],
4359			 struct netlink_ext_ack *extack)
4360{
4361	struct vxlan_config conf;
4362	int err;
4363
4364	err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4365	if (err)
4366		return err;
4367
4368	return __vxlan_dev_create(src_net, dev, &conf, extack);
4369}
4370
4371static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4372			    struct nlattr *data[],
4373			    struct netlink_ext_ack *extack)
4374{
4375	struct vxlan_dev *vxlan = netdev_priv(dev);
4376	struct net_device *lowerdev;
4377	struct vxlan_config conf;
4378	struct vxlan_rdst *dst;
4379	int err;
4380
4381	dst = &vxlan->default_dst;
4382	err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4383	if (err)
4384		return err;
4385
4386	err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4387				    vxlan, extack);
4388	if (err)
4389		return err;
4390
4391	if (dst->remote_dev == lowerdev)
4392		lowerdev = NULL;
4393
4394	err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4395					     extack);
4396	if (err)
4397		return err;
4398
4399	/* handle default dst entry */
4400	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4401		u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4402
4403		spin_lock_bh(&vxlan->hash_lock[hash_index]);
4404		if (!vxlan_addr_any(&conf.remote_ip)) {
4405			err = vxlan_fdb_update(vxlan, all_zeros_mac,
4406					       &conf.remote_ip,
4407					       NUD_REACHABLE | NUD_PERMANENT,
4408					       NLM_F_APPEND | NLM_F_CREATE,
4409					       vxlan->cfg.dst_port,
4410					       conf.vni, conf.vni,
4411					       conf.remote_ifindex,
4412					       NTF_SELF, 0, true, extack);
4413			if (err) {
4414				spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4415				netdev_adjacent_change_abort(dst->remote_dev,
4416							     lowerdev, dev);
4417				return err;
4418			}
4419		}
4420		if (!vxlan_addr_any(&dst->remote_ip))
4421			__vxlan_fdb_delete(vxlan, all_zeros_mac,
4422					   dst->remote_ip,
4423					   vxlan->cfg.dst_port,
4424					   dst->remote_vni,
4425					   dst->remote_vni,
4426					   dst->remote_ifindex,
4427					   true);
4428		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4429
4430		/* If vni filtering device, also update fdb entries of
4431		 * all vnis that were using default remote ip
4432		 */
4433		if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
4434			err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip,
4435							 &conf.remote_ip, extack);
4436			if (err) {
4437				netdev_adjacent_change_abort(dst->remote_dev,
4438							     lowerdev, dev);
4439				return err;
4440			}
4441		}
4442	}
4443
4444	if (conf.age_interval != vxlan->cfg.age_interval)
4445		mod_timer(&vxlan->age_timer, jiffies);
4446
4447	netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4448	if (lowerdev && lowerdev != dst->remote_dev)
4449		dst->remote_dev = lowerdev;
4450	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4451	return 0;
4452}
4453
4454static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4455{
4456	struct vxlan_dev *vxlan = netdev_priv(dev);
4457	struct vxlan_fdb_flush_desc desc = {
4458		/* Default entry is deleted at vxlan_uninit. */
4459		.ignore_default_entry = true,
4460	};
4461
4462	vxlan_flush(vxlan, &desc);
4463
4464	list_del(&vxlan->next);
4465	unregister_netdevice_queue(dev, head);
4466	if (vxlan->default_dst.remote_dev)
4467		netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4468}
4469
4470static size_t vxlan_get_size(const struct net_device *dev)
4471{
4472	return nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_ID */
4473		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4474		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LINK */
4475		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4476		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL */
4477		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL_INHERIT */
4478		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
4479		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_DF */
4480		nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4481		nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_LABEL_POLICY */
4482		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_LEARNING */
4483		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_PROXY */
4484		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_RSC */
4485		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L2MISS */
4486		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L3MISS */
4487		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_COLLECT_METADATA */
4488		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_AGEING */
4489		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LIMIT */
4490		nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4491		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4492		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4493		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4494		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4495		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4496		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */
4497		/* IFLA_VXLAN_PORT_RANGE */
4498		nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4499		nla_total_size(0) + /* IFLA_VXLAN_GBP */
4500		nla_total_size(0) + /* IFLA_VXLAN_GPE */
4501		nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */
4502		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */
4503		0;
4504}
4505
4506static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4507{
4508	const struct vxlan_dev *vxlan = netdev_priv(dev);
4509	const struct vxlan_rdst *dst = &vxlan->default_dst;
4510	struct ifla_vxlan_port_range ports = {
4511		.low =  htons(vxlan->cfg.port_min),
4512		.high = htons(vxlan->cfg.port_max),
4513	};
4514
4515	if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4516		goto nla_put_failure;
4517
4518	if (!vxlan_addr_any(&dst->remote_ip)) {
4519		if (dst->remote_ip.sa.sa_family == AF_INET) {
4520			if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4521					    dst->remote_ip.sin.sin_addr.s_addr))
4522				goto nla_put_failure;
4523#if IS_ENABLED(CONFIG_IPV6)
4524		} else {
4525			if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4526					     &dst->remote_ip.sin6.sin6_addr))
4527				goto nla_put_failure;
4528#endif
4529		}
4530	}
4531
4532	if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4533		goto nla_put_failure;
4534
4535	if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4536		if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4537			if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4538					    vxlan->cfg.saddr.sin.sin_addr.s_addr))
4539				goto nla_put_failure;
4540#if IS_ENABLED(CONFIG_IPV6)
4541		} else {
4542			if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4543					     &vxlan->cfg.saddr.sin6.sin6_addr))
4544				goto nla_put_failure;
4545#endif
4546		}
4547	}
4548
4549	if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4550	    nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4551		       !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4552	    nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4553	    nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4554	    nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4555	    nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) ||
4556	    nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4557		       !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4558	    nla_put_u8(skb, IFLA_VXLAN_PROXY,
4559		       !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4560	    nla_put_u8(skb, IFLA_VXLAN_RSC,
4561		       !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4562	    nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4563		       !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4564	    nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4565		       !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4566	    nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4567		       !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4568	    nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4569	    nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4570	    nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4571	    nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4572		       !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4573	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4574		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4575	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4576		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4577	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4578		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4579	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4580		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) ||
4581	    nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS,
4582		       !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS)))
4583		goto nla_put_failure;
4584
4585	if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4586		goto nla_put_failure;
4587
4588	if (vxlan->cfg.flags & VXLAN_F_GBP &&
4589	    nla_put_flag(skb, IFLA_VXLAN_GBP))
4590		goto nla_put_failure;
4591
4592	if (vxlan->cfg.flags & VXLAN_F_GPE &&
4593	    nla_put_flag(skb, IFLA_VXLAN_GPE))
4594		goto nla_put_failure;
4595
4596	if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4597	    nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4598		goto nla_put_failure;
4599
4600	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER &&
4601	    nla_put_u8(skb, IFLA_VXLAN_VNIFILTER,
4602		       !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER)))
4603		goto nla_put_failure;
4604
4605	return 0;
4606
4607nla_put_failure:
4608	return -EMSGSIZE;
4609}
4610
4611static struct net *vxlan_get_link_net(const struct net_device *dev)
4612{
4613	struct vxlan_dev *vxlan = netdev_priv(dev);
4614
4615	return READ_ONCE(vxlan->net);
4616}
4617
4618static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4619	.kind		= "vxlan",
4620	.maxtype	= IFLA_VXLAN_MAX,
4621	.policy		= vxlan_policy,
4622	.priv_size	= sizeof(struct vxlan_dev),
4623	.setup		= vxlan_setup,
4624	.validate	= vxlan_validate,
4625	.newlink	= vxlan_newlink,
4626	.changelink	= vxlan_changelink,
4627	.dellink	= vxlan_dellink,
4628	.get_size	= vxlan_get_size,
4629	.fill_info	= vxlan_fill_info,
4630	.get_link_net	= vxlan_get_link_net,
4631};
4632
4633struct net_device *vxlan_dev_create(struct net *net, const char *name,
4634				    u8 name_assign_type,
4635				    struct vxlan_config *conf)
4636{
4637	struct nlattr *tb[IFLA_MAX + 1];
4638	struct net_device *dev;
4639	int err;
4640
4641	memset(&tb, 0, sizeof(tb));
4642
4643	dev = rtnl_create_link(net, name, name_assign_type,
4644			       &vxlan_link_ops, tb, NULL);
4645	if (IS_ERR(dev))
4646		return dev;
4647
4648	err = __vxlan_dev_create(net, dev, conf, NULL);
4649	if (err < 0) {
4650		free_netdev(dev);
4651		return ERR_PTR(err);
4652	}
4653
4654	err = rtnl_configure_link(dev, NULL, 0, NULL);
4655	if (err < 0) {
4656		LIST_HEAD(list_kill);
4657
4658		vxlan_dellink(dev, &list_kill);
4659		unregister_netdevice_many(&list_kill);
4660		return ERR_PTR(err);
4661	}
4662
4663	return dev;
4664}
4665EXPORT_SYMBOL_GPL(vxlan_dev_create);
4666
4667static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4668					     struct net_device *dev)
4669{
4670	struct vxlan_dev *vxlan, *next;
4671	LIST_HEAD(list_kill);
4672
4673	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4674		struct vxlan_rdst *dst = &vxlan->default_dst;
4675
4676		/* In case we created vxlan device with carrier
4677		 * and we loose the carrier due to module unload
4678		 * we also need to remove vxlan device. In other
4679		 * cases, it's not necessary and remote_ifindex
4680		 * is 0 here, so no matches.
4681		 */
4682		if (dst->remote_ifindex == dev->ifindex)
4683			vxlan_dellink(vxlan->dev, &list_kill);
4684	}
4685
4686	unregister_netdevice_many(&list_kill);
4687}
4688
4689static int vxlan_netdevice_event(struct notifier_block *unused,
4690				 unsigned long event, void *ptr)
4691{
4692	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4693	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4694
4695	if (event == NETDEV_UNREGISTER)
4696		vxlan_handle_lowerdev_unregister(vn, dev);
4697	else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
4698		vxlan_offload_rx_ports(dev, true);
4699	else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
4700		vxlan_offload_rx_ports(dev, false);
4701
4702	return NOTIFY_DONE;
4703}
4704
4705static struct notifier_block vxlan_notifier_block __read_mostly = {
4706	.notifier_call = vxlan_netdevice_event,
4707};
4708
4709static void
4710vxlan_fdb_offloaded_set(struct net_device *dev,
4711			struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4712{
4713	struct vxlan_dev *vxlan = netdev_priv(dev);
4714	struct vxlan_rdst *rdst;
4715	struct vxlan_fdb *f;
4716	u32 hash_index;
4717
4718	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4719
4720	spin_lock_bh(&vxlan->hash_lock[hash_index]);
4721
4722	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4723	if (!f)
4724		goto out;
4725
4726	rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4727				   fdb_info->remote_port,
4728				   fdb_info->remote_vni,
4729				   fdb_info->remote_ifindex);
4730	if (!rdst)
4731		goto out;
4732
4733	rdst->offloaded = fdb_info->offloaded;
4734
4735out:
4736	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4737}
4738
4739static int
4740vxlan_fdb_external_learn_add(struct net_device *dev,
4741			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4742{
4743	struct vxlan_dev *vxlan = netdev_priv(dev);
4744	struct netlink_ext_ack *extack;
4745	u32 hash_index;
4746	int err;
4747
4748	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4749	extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4750
4751	spin_lock_bh(&vxlan->hash_lock[hash_index]);
4752	err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4753			       NUD_REACHABLE,
4754			       NLM_F_CREATE | NLM_F_REPLACE,
4755			       fdb_info->remote_port,
4756			       fdb_info->vni,
4757			       fdb_info->remote_vni,
4758			       fdb_info->remote_ifindex,
4759			       NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4760			       0, false, extack);
4761	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4762
4763	return err;
4764}
4765
4766static int
4767vxlan_fdb_external_learn_del(struct net_device *dev,
4768			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4769{
4770	struct vxlan_dev *vxlan = netdev_priv(dev);
4771	struct vxlan_fdb *f;
4772	u32 hash_index;
4773	int err = 0;
4774
4775	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4776	spin_lock_bh(&vxlan->hash_lock[hash_index]);
4777
4778	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4779	if (!f)
4780		err = -ENOENT;
4781	else if (f->flags & NTF_EXT_LEARNED)
4782		err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4783					 fdb_info->remote_ip,
4784					 fdb_info->remote_port,
4785					 fdb_info->vni,
4786					 fdb_info->remote_vni,
4787					 fdb_info->remote_ifindex,
4788					 false);
4789
4790	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4791
4792	return err;
4793}
4794
4795static int vxlan_switchdev_event(struct notifier_block *unused,
4796				 unsigned long event, void *ptr)
4797{
4798	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4799	struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4800	int err = 0;
4801
4802	switch (event) {
4803	case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4804		vxlan_fdb_offloaded_set(dev, ptr);
4805		break;
4806	case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4807		fdb_info = ptr;
4808		err = vxlan_fdb_external_learn_add(dev, fdb_info);
4809		if (err) {
4810			err = notifier_from_errno(err);
4811			break;
4812		}
4813		fdb_info->offloaded = true;
4814		vxlan_fdb_offloaded_set(dev, fdb_info);
4815		break;
4816	case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4817		fdb_info = ptr;
4818		err = vxlan_fdb_external_learn_del(dev, fdb_info);
4819		if (err) {
4820			err = notifier_from_errno(err);
4821			break;
4822		}
4823		fdb_info->offloaded = false;
4824		vxlan_fdb_offloaded_set(dev, fdb_info);
4825		break;
4826	}
4827
4828	return err;
4829}
4830
4831static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4832	.notifier_call = vxlan_switchdev_event,
4833};
4834
4835static void vxlan_fdb_nh_flush(struct nexthop *nh)
4836{
4837	struct vxlan_fdb *fdb;
4838	struct vxlan_dev *vxlan;
4839	u32 hash_index;
4840
4841	rcu_read_lock();
4842	list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4843		vxlan = rcu_dereference(fdb->vdev);
4844		WARN_ON(!vxlan);
4845		hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4846					    vxlan->default_dst.remote_vni);
4847		spin_lock_bh(&vxlan->hash_lock[hash_index]);
4848		if (!hlist_unhashed(&fdb->hlist))
4849			vxlan_fdb_destroy(vxlan, fdb, false, false);
4850		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4851	}
4852	rcu_read_unlock();
4853}
4854
4855static int vxlan_nexthop_event(struct notifier_block *nb,
4856			       unsigned long event, void *ptr)
4857{
4858	struct nh_notifier_info *info = ptr;
4859	struct nexthop *nh;
4860
4861	if (event != NEXTHOP_EVENT_DEL)
4862		return NOTIFY_DONE;
4863
4864	nh = nexthop_find_by_id(info->net, info->id);
4865	if (!nh)
4866		return NOTIFY_DONE;
4867
4868	vxlan_fdb_nh_flush(nh);
4869
4870	return NOTIFY_DONE;
4871}
4872
4873static __net_init int vxlan_init_net(struct net *net)
4874{
4875	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4876	unsigned int h;
4877
4878	INIT_LIST_HEAD(&vn->vxlan_list);
4879	spin_lock_init(&vn->sock_lock);
4880	vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
4881
4882	for (h = 0; h < PORT_HASH_SIZE; ++h)
4883		INIT_HLIST_HEAD(&vn->sock_list[h]);
4884
4885	return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
4886					 NULL);
4887}
4888
4889static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn,
4890					     struct list_head *dev_to_kill)
4891{
4892	struct vxlan_dev *vxlan, *next;
4893
4894	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next)
4895		vxlan_dellink(vxlan->dev, dev_to_kill);
4896}
4897
4898static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list,
4899					     struct list_head *dev_to_kill)
4900{
4901	struct net *net;
4902
4903	ASSERT_RTNL();
4904	list_for_each_entry(net, net_list, exit_list) {
4905		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4906
4907		__unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
4908
4909		vxlan_destroy_tunnels(vn, dev_to_kill);
4910	}
4911}
4912
4913static void __net_exit vxlan_exit_net(struct net *net)
4914{
4915	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4916	unsigned int h;
4917
4918	for (h = 0; h < PORT_HASH_SIZE; ++h)
4919		WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4920}
4921
4922static struct pernet_operations vxlan_net_ops = {
4923	.init = vxlan_init_net,
4924	.exit_batch_rtnl = vxlan_exit_batch_rtnl,
4925	.exit = vxlan_exit_net,
4926	.id   = &vxlan_net_id,
4927	.size = sizeof(struct vxlan_net),
4928};
4929
4930static int __init vxlan_init_module(void)
4931{
4932	int rc;
4933
4934	get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4935
4936	rc = register_pernet_subsys(&vxlan_net_ops);
4937	if (rc)
4938		goto out1;
4939
4940	rc = register_netdevice_notifier(&vxlan_notifier_block);
4941	if (rc)
4942		goto out2;
4943
4944	rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4945	if (rc)
4946		goto out3;
4947
4948	rc = rtnl_link_register(&vxlan_link_ops);
4949	if (rc)
4950		goto out4;
4951
4952	rc = vxlan_vnifilter_init();
4953	if (rc)
4954		goto out5;
4955
4956	return 0;
4957out5:
4958	rtnl_link_unregister(&vxlan_link_ops);
4959out4:
4960	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4961out3:
4962	unregister_netdevice_notifier(&vxlan_notifier_block);
4963out2:
4964	unregister_pernet_subsys(&vxlan_net_ops);
4965out1:
4966	return rc;
4967}
4968late_initcall(vxlan_init_module);
4969
4970static void __exit vxlan_cleanup_module(void)
4971{
4972	vxlan_vnifilter_uninit();
4973	rtnl_link_unregister(&vxlan_link_ops);
4974	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4975	unregister_netdevice_notifier(&vxlan_notifier_block);
4976	unregister_pernet_subsys(&vxlan_net_ops);
4977	/* rcu_barrier() is called by netns */
4978}
4979module_exit(vxlan_cleanup_module);
4980
4981MODULE_LICENSE("GPL");
4982MODULE_VERSION(VXLAN_VERSION);
4983MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4984MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4985MODULE_ALIAS_RTNL_LINK("vxlan");