cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vxlan_core.c (122640B)


      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#if IS_ENABLED(CONFIG_IPV6)
     75static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
     76{
     77	if (nla_len(nla) >= sizeof(struct in6_addr)) {
     78		ip->sin6.sin6_addr = nla_get_in6_addr(nla);
     79		ip->sa.sa_family = AF_INET6;
     80		return 0;
     81	} else if (nla_len(nla) >= sizeof(__be32)) {
     82		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
     83		ip->sa.sa_family = AF_INET;
     84		return 0;
     85	} else {
     86		return -EAFNOSUPPORT;
     87	}
     88}
     89
     90static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
     91			      const union vxlan_addr *ip)
     92{
     93	if (ip->sa.sa_family == AF_INET6)
     94		return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
     95	else
     96		return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
     97}
     98
     99#else /* !CONFIG_IPV6 */
    100
    101static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
    102{
    103	if (nla_len(nla) >= sizeof(struct in6_addr)) {
    104		return -EAFNOSUPPORT;
    105	} else if (nla_len(nla) >= sizeof(__be32)) {
    106		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
    107		ip->sa.sa_family = AF_INET;
    108		return 0;
    109	} else {
    110		return -EAFNOSUPPORT;
    111	}
    112}
    113
    114static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
    115			      const union vxlan_addr *ip)
    116{
    117	return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
    118}
    119#endif
    120
    121/* Find VXLAN socket based on network namespace, address family, UDP port,
    122 * enabled unshareable flags and socket device binding (see l3mdev with
    123 * non-default VRF).
    124 */
    125static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
    126					  __be16 port, u32 flags, int ifindex)
    127{
    128	struct vxlan_sock *vs;
    129
    130	flags &= VXLAN_F_RCV_FLAGS;
    131
    132	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
    133		if (inet_sk(vs->sock->sk)->inet_sport == port &&
    134		    vxlan_get_sk_family(vs) == family &&
    135		    vs->flags == flags &&
    136		    vs->sock->sk->sk_bound_dev_if == ifindex)
    137			return vs;
    138	}
    139	return NULL;
    140}
    141
    142static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs,
    143					   int ifindex, __be32 vni,
    144					   struct vxlan_vni_node **vninode)
    145{
    146	struct vxlan_vni_node *vnode;
    147	struct vxlan_dev_node *node;
    148
    149	/* For flow based devices, map all packets to VNI 0 */
    150	if (vs->flags & VXLAN_F_COLLECT_METADATA &&
    151	    !(vs->flags & VXLAN_F_VNIFILTER))
    152		vni = 0;
    153
    154	hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
    155		if (!node->vxlan)
    156			continue;
    157		vnode = NULL;
    158		if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
    159			vnode = vxlan_vnifilter_lookup(node->vxlan, vni);
    160			if (!vnode)
    161				continue;
    162		} else if (node->vxlan->default_dst.remote_vni != vni) {
    163			continue;
    164		}
    165
    166		if (IS_ENABLED(CONFIG_IPV6)) {
    167			const struct vxlan_config *cfg = &node->vxlan->cfg;
    168
    169			if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
    170			    cfg->remote_ifindex != ifindex)
    171				continue;
    172		}
    173
    174		if (vninode)
    175			*vninode = vnode;
    176		return node->vxlan;
    177	}
    178
    179	return NULL;
    180}
    181
    182/* Look up VNI in a per net namespace table */
    183static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
    184					__be32 vni, sa_family_t family,
    185					__be16 port, u32 flags)
    186{
    187	struct vxlan_sock *vs;
    188
    189	vs = vxlan_find_sock(net, family, port, flags, ifindex);
    190	if (!vs)
    191		return NULL;
    192
    193	return vxlan_vs_find_vni(vs, ifindex, vni, NULL);
    194}
    195
    196/* Fill in neighbour message in skbuff. */
    197static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
    198			  const struct vxlan_fdb *fdb,
    199			  u32 portid, u32 seq, int type, unsigned int flags,
    200			  const struct vxlan_rdst *rdst)
    201{
    202	unsigned long now = jiffies;
    203	struct nda_cacheinfo ci;
    204	bool send_ip, send_eth;
    205	struct nlmsghdr *nlh;
    206	struct nexthop *nh;
    207	struct ndmsg *ndm;
    208	int nh_family;
    209	u32 nh_id;
    210
    211	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
    212	if (nlh == NULL)
    213		return -EMSGSIZE;
    214
    215	ndm = nlmsg_data(nlh);
    216	memset(ndm, 0, sizeof(*ndm));
    217
    218	send_eth = send_ip = true;
    219
    220	rcu_read_lock();
    221	nh = rcu_dereference(fdb->nh);
    222	if (nh) {
    223		nh_family = nexthop_get_family(nh);
    224		nh_id = nh->id;
    225	}
    226	rcu_read_unlock();
    227
    228	if (type == RTM_GETNEIGH) {
    229		if (rdst) {
    230			send_ip = !vxlan_addr_any(&rdst->remote_ip);
    231			ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
    232		} else if (nh) {
    233			ndm->ndm_family = nh_family;
    234		}
    235		send_eth = !is_zero_ether_addr(fdb->eth_addr);
    236	} else
    237		ndm->ndm_family	= AF_BRIDGE;
    238	ndm->ndm_state = fdb->state;
    239	ndm->ndm_ifindex = vxlan->dev->ifindex;
    240	ndm->ndm_flags = fdb->flags;
    241	if (rdst && rdst->offloaded)
    242		ndm->ndm_flags |= NTF_OFFLOADED;
    243	ndm->ndm_type = RTN_UNICAST;
    244
    245	if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
    246	    nla_put_s32(skb, NDA_LINK_NETNSID,
    247			peernet2id(dev_net(vxlan->dev), vxlan->net)))
    248		goto nla_put_failure;
    249
    250	if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
    251		goto nla_put_failure;
    252	if (nh) {
    253		if (nla_put_u32(skb, NDA_NH_ID, nh_id))
    254			goto nla_put_failure;
    255	} else if (rdst) {
    256		if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
    257						  &rdst->remote_ip))
    258			goto nla_put_failure;
    259
    260		if (rdst->remote_port &&
    261		    rdst->remote_port != vxlan->cfg.dst_port &&
    262		    nla_put_be16(skb, NDA_PORT, rdst->remote_port))
    263			goto nla_put_failure;
    264		if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
    265		    nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
    266			goto nla_put_failure;
    267		if (rdst->remote_ifindex &&
    268		    nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
    269			goto nla_put_failure;
    270	}
    271
    272	if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
    273	    nla_put_u32(skb, NDA_SRC_VNI,
    274			be32_to_cpu(fdb->vni)))
    275		goto nla_put_failure;
    276
    277	ci.ndm_used	 = jiffies_to_clock_t(now - fdb->used);
    278	ci.ndm_confirmed = 0;
    279	ci.ndm_updated	 = jiffies_to_clock_t(now - fdb->updated);
    280	ci.ndm_refcnt	 = 0;
    281
    282	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
    283		goto nla_put_failure;
    284
    285	nlmsg_end(skb, nlh);
    286	return 0;
    287
    288nla_put_failure:
    289	nlmsg_cancel(skb, nlh);
    290	return -EMSGSIZE;
    291}
    292
    293static inline size_t vxlan_nlmsg_size(void)
    294{
    295	return NLMSG_ALIGN(sizeof(struct ndmsg))
    296		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
    297		+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
    298		+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
    299		+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
    300		+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
    301		+ nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
    302		+ nla_total_size(sizeof(struct nda_cacheinfo));
    303}
    304
    305static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
    306			       struct vxlan_rdst *rd, int type)
    307{
    308	struct net *net = dev_net(vxlan->dev);
    309	struct sk_buff *skb;
    310	int err = -ENOBUFS;
    311
    312	skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
    313	if (skb == NULL)
    314		goto errout;
    315
    316	err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
    317	if (err < 0) {
    318		/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
    319		WARN_ON(err == -EMSGSIZE);
    320		kfree_skb(skb);
    321		goto errout;
    322	}
    323
    324	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
    325	return;
    326errout:
    327	if (err < 0)
    328		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
    329}
    330
    331static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
    332			    const struct vxlan_fdb *fdb,
    333			    const struct vxlan_rdst *rd,
    334			    struct netlink_ext_ack *extack,
    335			    struct switchdev_notifier_vxlan_fdb_info *fdb_info)
    336{
    337	fdb_info->info.dev = vxlan->dev;
    338	fdb_info->info.extack = extack;
    339	fdb_info->remote_ip = rd->remote_ip;
    340	fdb_info->remote_port = rd->remote_port;
    341	fdb_info->remote_vni = rd->remote_vni;
    342	fdb_info->remote_ifindex = rd->remote_ifindex;
    343	memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
    344	fdb_info->vni = fdb->vni;
    345	fdb_info->offloaded = rd->offloaded;
    346	fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
    347}
    348
    349static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
    350					      struct vxlan_fdb *fdb,
    351					      struct vxlan_rdst *rd,
    352					      bool adding,
    353					      struct netlink_ext_ack *extack)
    354{
    355	struct switchdev_notifier_vxlan_fdb_info info;
    356	enum switchdev_notifier_type notifier_type;
    357	int ret;
    358
    359	if (WARN_ON(!rd))
    360		return 0;
    361
    362	notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
    363			       : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
    364	vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
    365	ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
    366				       &info.info, extack);
    367	return notifier_to_errno(ret);
    368}
    369
    370static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
    371			    struct vxlan_rdst *rd, int type, bool swdev_notify,
    372			    struct netlink_ext_ack *extack)
    373{
    374	int err;
    375
    376	if (swdev_notify && rd) {
    377		switch (type) {
    378		case RTM_NEWNEIGH:
    379			err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
    380								 true, extack);
    381			if (err)
    382				return err;
    383			break;
    384		case RTM_DELNEIGH:
    385			vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
    386							   false, extack);
    387			break;
    388		}
    389	}
    390
    391	__vxlan_fdb_notify(vxlan, fdb, rd, type);
    392	return 0;
    393}
    394
    395static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
    396{
    397	struct vxlan_dev *vxlan = netdev_priv(dev);
    398	struct vxlan_fdb f = {
    399		.state = NUD_STALE,
    400	};
    401	struct vxlan_rdst remote = {
    402		.remote_ip = *ipa, /* goes to NDA_DST */
    403		.remote_vni = cpu_to_be32(VXLAN_N_VID),
    404	};
    405
    406	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
    407}
    408
    409static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
    410{
    411	struct vxlan_fdb f = {
    412		.state = NUD_STALE,
    413	};
    414	struct vxlan_rdst remote = { };
    415
    416	memcpy(f.eth_addr, eth_addr, ETH_ALEN);
    417
    418	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
    419}
    420
    421/* Hash Ethernet address */
    422static u32 eth_hash(const unsigned char *addr)
    423{
    424	u64 value = get_unaligned((u64 *)addr);
    425
    426	/* only want 6 bytes */
    427#ifdef __BIG_ENDIAN
    428	value >>= 16;
    429#else
    430	value <<= 16;
    431#endif
    432	return hash_64(value, FDB_HASH_BITS);
    433}
    434
    435u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
    436{
    437	/* use 1 byte of OUI and 3 bytes of NIC */
    438	u32 key = get_unaligned((u32 *)(addr + 2));
    439
    440	return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
    441}
    442
    443u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
    444{
    445	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
    446		return eth_vni_hash(mac, vni);
    447	else
    448		return eth_hash(mac);
    449}
    450
    451/* Hash chain to use given mac address */
    452static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
    453						const u8 *mac, __be32 vni)
    454{
    455	return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
    456}
    457
    458/* Look up Ethernet address in forwarding table */
    459static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
    460					  const u8 *mac, __be32 vni)
    461{
    462	struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
    463	struct vxlan_fdb *f;
    464
    465	hlist_for_each_entry_rcu(f, head, hlist) {
    466		if (ether_addr_equal(mac, f->eth_addr)) {
    467			if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
    468				if (vni == f->vni)
    469					return f;
    470			} else {
    471				return f;
    472			}
    473		}
    474	}
    475
    476	return NULL;
    477}
    478
    479static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
    480					const u8 *mac, __be32 vni)
    481{
    482	struct vxlan_fdb *f;
    483
    484	f = __vxlan_find_mac(vxlan, mac, vni);
    485	if (f && f->used != jiffies)
    486		f->used = jiffies;
    487
    488	return f;
    489}
    490
    491/* caller should hold vxlan->hash_lock */
    492static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
    493					      union vxlan_addr *ip, __be16 port,
    494					      __be32 vni, __u32 ifindex)
    495{
    496	struct vxlan_rdst *rd;
    497
    498	list_for_each_entry(rd, &f->remotes, list) {
    499		if (vxlan_addr_equal(&rd->remote_ip, ip) &&
    500		    rd->remote_port == port &&
    501		    rd->remote_vni == vni &&
    502		    rd->remote_ifindex == ifindex)
    503			return rd;
    504	}
    505
    506	return NULL;
    507}
    508
    509int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
    510		      struct switchdev_notifier_vxlan_fdb_info *fdb_info)
    511{
    512	struct vxlan_dev *vxlan = netdev_priv(dev);
    513	u8 eth_addr[ETH_ALEN + 2] = { 0 };
    514	struct vxlan_rdst *rdst;
    515	struct vxlan_fdb *f;
    516	int rc = 0;
    517
    518	if (is_multicast_ether_addr(mac) ||
    519	    is_zero_ether_addr(mac))
    520		return -EINVAL;
    521
    522	ether_addr_copy(eth_addr, mac);
    523
    524	rcu_read_lock();
    525
    526	f = __vxlan_find_mac(vxlan, eth_addr, vni);
    527	if (!f) {
    528		rc = -ENOENT;
    529		goto out;
    530	}
    531
    532	rdst = first_remote_rcu(f);
    533	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
    534
    535out:
    536	rcu_read_unlock();
    537	return rc;
    538}
    539EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
    540
    541static int vxlan_fdb_notify_one(struct notifier_block *nb,
    542				const struct vxlan_dev *vxlan,
    543				const struct vxlan_fdb *f,
    544				const struct vxlan_rdst *rdst,
    545				struct netlink_ext_ack *extack)
    546{
    547	struct switchdev_notifier_vxlan_fdb_info fdb_info;
    548	int rc;
    549
    550	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
    551	rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
    552			       &fdb_info);
    553	return notifier_to_errno(rc);
    554}
    555
    556int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
    557		     struct notifier_block *nb,
    558		     struct netlink_ext_ack *extack)
    559{
    560	struct vxlan_dev *vxlan;
    561	struct vxlan_rdst *rdst;
    562	struct vxlan_fdb *f;
    563	unsigned int h;
    564	int rc = 0;
    565
    566	if (!netif_is_vxlan(dev))
    567		return -EINVAL;
    568	vxlan = netdev_priv(dev);
    569
    570	for (h = 0; h < FDB_HASH_SIZE; ++h) {
    571		spin_lock_bh(&vxlan->hash_lock[h]);
    572		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
    573			if (f->vni == vni) {
    574				list_for_each_entry(rdst, &f->remotes, list) {
    575					rc = vxlan_fdb_notify_one(nb, vxlan,
    576								  f, rdst,
    577								  extack);
    578					if (rc)
    579						goto unlock;
    580				}
    581			}
    582		}
    583		spin_unlock_bh(&vxlan->hash_lock[h]);
    584	}
    585	return 0;
    586
    587unlock:
    588	spin_unlock_bh(&vxlan->hash_lock[h]);
    589	return rc;
    590}
    591EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
    592
    593void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
    594{
    595	struct vxlan_dev *vxlan;
    596	struct vxlan_rdst *rdst;
    597	struct vxlan_fdb *f;
    598	unsigned int h;
    599
    600	if (!netif_is_vxlan(dev))
    601		return;
    602	vxlan = netdev_priv(dev);
    603
    604	for (h = 0; h < FDB_HASH_SIZE; ++h) {
    605		spin_lock_bh(&vxlan->hash_lock[h]);
    606		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
    607			if (f->vni == vni)
    608				list_for_each_entry(rdst, &f->remotes, list)
    609					rdst->offloaded = false;
    610		spin_unlock_bh(&vxlan->hash_lock[h]);
    611	}
    612
    613}
    614EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
    615
    616/* Replace destination of unicast mac */
    617static int vxlan_fdb_replace(struct vxlan_fdb *f,
    618			     union vxlan_addr *ip, __be16 port, __be32 vni,
    619			     __u32 ifindex, struct vxlan_rdst *oldrd)
    620{
    621	struct vxlan_rdst *rd;
    622
    623	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
    624	if (rd)
    625		return 0;
    626
    627	rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
    628	if (!rd)
    629		return 0;
    630
    631	*oldrd = *rd;
    632	dst_cache_reset(&rd->dst_cache);
    633	rd->remote_ip = *ip;
    634	rd->remote_port = port;
    635	rd->remote_vni = vni;
    636	rd->remote_ifindex = ifindex;
    637	rd->offloaded = false;
    638	return 1;
    639}
    640
    641/* Add/update destinations for multicast */
    642static int vxlan_fdb_append(struct vxlan_fdb *f,
    643			    union vxlan_addr *ip, __be16 port, __be32 vni,
    644			    __u32 ifindex, struct vxlan_rdst **rdp)
    645{
    646	struct vxlan_rdst *rd;
    647
    648	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
    649	if (rd)
    650		return 0;
    651
    652	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
    653	if (rd == NULL)
    654		return -ENOMEM;
    655
    656	if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
    657		kfree(rd);
    658		return -ENOMEM;
    659	}
    660
    661	rd->remote_ip = *ip;
    662	rd->remote_port = port;
    663	rd->offloaded = false;
    664	rd->remote_vni = vni;
    665	rd->remote_ifindex = ifindex;
    666
    667	list_add_tail_rcu(&rd->list, &f->remotes);
    668
    669	*rdp = rd;
    670	return 1;
    671}
    672
    673static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
    674					  unsigned int off,
    675					  struct vxlanhdr *vh, size_t hdrlen,
    676					  __be32 vni_field,
    677					  struct gro_remcsum *grc,
    678					  bool nopartial)
    679{
    680	size_t start, offset;
    681
    682	if (skb->remcsum_offload)
    683		return vh;
    684
    685	if (!NAPI_GRO_CB(skb)->csum_valid)
    686		return NULL;
    687
    688	start = vxlan_rco_start(vni_field);
    689	offset = start + vxlan_rco_offset(vni_field);
    690
    691	vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
    692				     start, offset, grc, nopartial);
    693
    694	skb->remcsum_offload = 1;
    695
    696	return vh;
    697}
    698
    699static struct sk_buff *vxlan_gro_receive(struct sock *sk,
    700					 struct list_head *head,
    701					 struct sk_buff *skb)
    702{
    703	struct sk_buff *pp = NULL;
    704	struct sk_buff *p;
    705	struct vxlanhdr *vh, *vh2;
    706	unsigned int hlen, off_vx;
    707	int flush = 1;
    708	struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
    709	__be32 flags;
    710	struct gro_remcsum grc;
    711
    712	skb_gro_remcsum_init(&grc);
    713
    714	off_vx = skb_gro_offset(skb);
    715	hlen = off_vx + sizeof(*vh);
    716	vh   = skb_gro_header_fast(skb, off_vx);
    717	if (skb_gro_header_hard(skb, hlen)) {
    718		vh = skb_gro_header_slow(skb, hlen, off_vx);
    719		if (unlikely(!vh))
    720			goto out;
    721	}
    722
    723	skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
    724
    725	flags = vh->vx_flags;
    726
    727	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
    728		vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
    729				       vh->vx_vni, &grc,
    730				       !!(vs->flags &
    731					  VXLAN_F_REMCSUM_NOPARTIAL));
    732
    733		if (!vh)
    734			goto out;
    735	}
    736
    737	skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
    738
    739	list_for_each_entry(p, head, list) {
    740		if (!NAPI_GRO_CB(p)->same_flow)
    741			continue;
    742
    743		vh2 = (struct vxlanhdr *)(p->data + off_vx);
    744		if (vh->vx_flags != vh2->vx_flags ||
    745		    vh->vx_vni != vh2->vx_vni) {
    746			NAPI_GRO_CB(p)->same_flow = 0;
    747			continue;
    748		}
    749	}
    750
    751	pp = call_gro_receive(eth_gro_receive, head, skb);
    752	flush = 0;
    753
    754out:
    755	skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
    756
    757	return pp;
    758}
    759
    760static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
    761{
    762	/* Sets 'skb->inner_mac_header' since we are always called with
    763	 * 'skb->encapsulation' set.
    764	 */
    765	return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
    766}
    767
    768static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
    769					 __u16 state, __be32 src_vni,
    770					 __u16 ndm_flags)
    771{
    772	struct vxlan_fdb *f;
    773
    774	f = kmalloc(sizeof(*f), GFP_ATOMIC);
    775	if (!f)
    776		return NULL;
    777	f->state = state;
    778	f->flags = ndm_flags;
    779	f->updated = f->used = jiffies;
    780	f->vni = src_vni;
    781	f->nh = NULL;
    782	RCU_INIT_POINTER(f->vdev, vxlan);
    783	INIT_LIST_HEAD(&f->nh_list);
    784	INIT_LIST_HEAD(&f->remotes);
    785	memcpy(f->eth_addr, mac, ETH_ALEN);
    786
    787	return f;
    788}
    789
    790static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
    791			     __be32 src_vni, struct vxlan_fdb *f)
    792{
    793	++vxlan->addrcnt;
    794	hlist_add_head_rcu(&f->hlist,
    795			   vxlan_fdb_head(vxlan, mac, src_vni));
    796}
    797
    798static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
    799			       u32 nhid, struct netlink_ext_ack *extack)
    800{
    801	struct nexthop *old_nh = rtnl_dereference(fdb->nh);
    802	struct nexthop *nh;
    803	int err = -EINVAL;
    804
    805	if (old_nh && old_nh->id == nhid)
    806		return 0;
    807
    808	nh = nexthop_find_by_id(vxlan->net, nhid);
    809	if (!nh) {
    810		NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
    811		goto err_inval;
    812	}
    813
    814	if (!nexthop_get(nh)) {
    815		NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
    816		nh = NULL;
    817		goto err_inval;
    818	}
    819	if (!nexthop_is_fdb(nh)) {
    820		NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
    821		goto err_inval;
    822	}
    823
    824	if (!nexthop_is_multipath(nh)) {
    825		NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
    826		goto err_inval;
    827	}
    828
    829	/* check nexthop group family */
    830	switch (vxlan->default_dst.remote_ip.sa.sa_family) {
    831	case AF_INET:
    832		if (!nexthop_has_v4(nh)) {
    833			err = -EAFNOSUPPORT;
    834			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
    835			goto err_inval;
    836		}
    837		break;
    838	case AF_INET6:
    839		if (nexthop_has_v4(nh)) {
    840			err = -EAFNOSUPPORT;
    841			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
    842			goto err_inval;
    843		}
    844	}
    845
    846	if (old_nh) {
    847		list_del_rcu(&fdb->nh_list);
    848		nexthop_put(old_nh);
    849	}
    850	rcu_assign_pointer(fdb->nh, nh);
    851	list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
    852	return 1;
    853
    854err_inval:
    855	if (nh)
    856		nexthop_put(nh);
    857	return err;
    858}
    859
    860int vxlan_fdb_create(struct vxlan_dev *vxlan,
    861		     const u8 *mac, union vxlan_addr *ip,
    862		     __u16 state, __be16 port, __be32 src_vni,
    863		     __be32 vni, __u32 ifindex, __u16 ndm_flags,
    864		     u32 nhid, struct vxlan_fdb **fdb,
    865		     struct netlink_ext_ack *extack)
    866{
    867	struct vxlan_rdst *rd = NULL;
    868	struct vxlan_fdb *f;
    869	int rc;
    870
    871	if (vxlan->cfg.addrmax &&
    872	    vxlan->addrcnt >= vxlan->cfg.addrmax)
    873		return -ENOSPC;
    874
    875	netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
    876	f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
    877	if (!f)
    878		return -ENOMEM;
    879
    880	if (nhid)
    881		rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
    882	else
    883		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
    884	if (rc < 0)
    885		goto errout;
    886
    887	*fdb = f;
    888
    889	return 0;
    890
    891errout:
    892	kfree(f);
    893	return rc;
    894}
    895
    896static void __vxlan_fdb_free(struct vxlan_fdb *f)
    897{
    898	struct vxlan_rdst *rd, *nd;
    899	struct nexthop *nh;
    900
    901	nh = rcu_dereference_raw(f->nh);
    902	if (nh) {
    903		rcu_assign_pointer(f->nh, NULL);
    904		rcu_assign_pointer(f->vdev, NULL);
    905		nexthop_put(nh);
    906	}
    907
    908	list_for_each_entry_safe(rd, nd, &f->remotes, list) {
    909		dst_cache_destroy(&rd->dst_cache);
    910		kfree(rd);
    911	}
    912	kfree(f);
    913}
    914
    915static void vxlan_fdb_free(struct rcu_head *head)
    916{
    917	struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
    918
    919	__vxlan_fdb_free(f);
    920}
    921
    922static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
    923			      bool do_notify, bool swdev_notify)
    924{
    925	struct vxlan_rdst *rd;
    926
    927	netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
    928
    929	--vxlan->addrcnt;
    930	if (do_notify) {
    931		if (rcu_access_pointer(f->nh))
    932			vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
    933					 swdev_notify, NULL);
    934		else
    935			list_for_each_entry(rd, &f->remotes, list)
    936				vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
    937						 swdev_notify, NULL);
    938	}
    939
    940	hlist_del_rcu(&f->hlist);
    941	list_del_rcu(&f->nh_list);
    942	call_rcu(&f->rcu, vxlan_fdb_free);
    943}
    944
    945static void vxlan_dst_free(struct rcu_head *head)
    946{
    947	struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
    948
    949	dst_cache_destroy(&rd->dst_cache);
    950	kfree(rd);
    951}
    952
    953static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
    954				     union vxlan_addr *ip,
    955				     __u16 state, __u16 flags,
    956				     __be16 port, __be32 vni,
    957				     __u32 ifindex, __u16 ndm_flags,
    958				     struct vxlan_fdb *f, u32 nhid,
    959				     bool swdev_notify,
    960				     struct netlink_ext_ack *extack)
    961{
    962	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
    963	struct vxlan_rdst *rd = NULL;
    964	struct vxlan_rdst oldrd;
    965	int notify = 0;
    966	int rc = 0;
    967	int err;
    968
    969	if (nhid && !rcu_access_pointer(f->nh)) {
    970		NL_SET_ERR_MSG(extack,
    971			       "Cannot replace an existing non nexthop fdb with a nexthop");
    972		return -EOPNOTSUPP;
    973	}
    974
    975	if (nhid && (flags & NLM_F_APPEND)) {
    976		NL_SET_ERR_MSG(extack,
    977			       "Cannot append to a nexthop fdb");
    978		return -EOPNOTSUPP;
    979	}
    980
    981	/* Do not allow an externally learned entry to take over an entry added
    982	 * by the user.
    983	 */
    984	if (!(fdb_flags & NTF_EXT_LEARNED) ||
    985	    !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
    986		if (f->state != state) {
    987			f->state = state;
    988			f->updated = jiffies;
    989			notify = 1;
    990		}
    991		if (f->flags != fdb_flags) {
    992			f->flags = fdb_flags;
    993			f->updated = jiffies;
    994			notify = 1;
    995		}
    996	}
    997
    998	if ((flags & NLM_F_REPLACE)) {
    999		/* Only change unicasts */
   1000		if (!(is_multicast_ether_addr(f->eth_addr) ||
   1001		      is_zero_ether_addr(f->eth_addr))) {
   1002			if (nhid) {
   1003				rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
   1004				if (rc < 0)
   1005					return rc;
   1006			} else {
   1007				rc = vxlan_fdb_replace(f, ip, port, vni,
   1008						       ifindex, &oldrd);
   1009			}
   1010			notify |= rc;
   1011		} else {
   1012			NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
   1013			return -EOPNOTSUPP;
   1014		}
   1015	}
   1016	if ((flags & NLM_F_APPEND) &&
   1017	    (is_multicast_ether_addr(f->eth_addr) ||
   1018	     is_zero_ether_addr(f->eth_addr))) {
   1019		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
   1020
   1021		if (rc < 0)
   1022			return rc;
   1023		notify |= rc;
   1024	}
   1025
   1026	if (ndm_flags & NTF_USE)
   1027		f->used = jiffies;
   1028
   1029	if (notify) {
   1030		if (rd == NULL)
   1031			rd = first_remote_rtnl(f);
   1032
   1033		err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
   1034				       swdev_notify, extack);
   1035		if (err)
   1036			goto err_notify;
   1037	}
   1038
   1039	return 0;
   1040
   1041err_notify:
   1042	if (nhid)
   1043		return err;
   1044	if ((flags & NLM_F_REPLACE) && rc)
   1045		*rd = oldrd;
   1046	else if ((flags & NLM_F_APPEND) && rc) {
   1047		list_del_rcu(&rd->list);
   1048		call_rcu(&rd->rcu, vxlan_dst_free);
   1049	}
   1050	return err;
   1051}
   1052
   1053static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
   1054				   const u8 *mac, union vxlan_addr *ip,
   1055				   __u16 state, __u16 flags,
   1056				   __be16 port, __be32 src_vni, __be32 vni,
   1057				   __u32 ifindex, __u16 ndm_flags, u32 nhid,
   1058				   bool swdev_notify,
   1059				   struct netlink_ext_ack *extack)
   1060{
   1061	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
   1062	struct vxlan_fdb *f;
   1063	int rc;
   1064
   1065	/* Disallow replace to add a multicast entry */
   1066	if ((flags & NLM_F_REPLACE) &&
   1067	    (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
   1068		return -EOPNOTSUPP;
   1069
   1070	netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
   1071	rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
   1072			      vni, ifindex, fdb_flags, nhid, &f, extack);
   1073	if (rc < 0)
   1074		return rc;
   1075
   1076	vxlan_fdb_insert(vxlan, mac, src_vni, f);
   1077	rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
   1078			      swdev_notify, extack);
   1079	if (rc)
   1080		goto err_notify;
   1081
   1082	return 0;
   1083
   1084err_notify:
   1085	vxlan_fdb_destroy(vxlan, f, false, false);
   1086	return rc;
   1087}
   1088
   1089/* Add new entry to forwarding table -- assumes lock held */
   1090int vxlan_fdb_update(struct vxlan_dev *vxlan,
   1091		     const u8 *mac, union vxlan_addr *ip,
   1092		     __u16 state, __u16 flags,
   1093		     __be16 port, __be32 src_vni, __be32 vni,
   1094		     __u32 ifindex, __u16 ndm_flags, u32 nhid,
   1095		     bool swdev_notify,
   1096		     struct netlink_ext_ack *extack)
   1097{
   1098	struct vxlan_fdb *f;
   1099
   1100	f = __vxlan_find_mac(vxlan, mac, src_vni);
   1101	if (f) {
   1102		if (flags & NLM_F_EXCL) {
   1103			netdev_dbg(vxlan->dev,
   1104				   "lost race to create %pM\n", mac);
   1105			return -EEXIST;
   1106		}
   1107
   1108		return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
   1109						 vni, ifindex, ndm_flags, f,
   1110						 nhid, swdev_notify, extack);
   1111	} else {
   1112		if (!(flags & NLM_F_CREATE))
   1113			return -ENOENT;
   1114
   1115		return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
   1116					       port, src_vni, vni, ifindex,
   1117					       ndm_flags, nhid, swdev_notify,
   1118					       extack);
   1119	}
   1120}
   1121
   1122static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
   1123				  struct vxlan_rdst *rd, bool swdev_notify)
   1124{
   1125	list_del_rcu(&rd->list);
   1126	vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
   1127	call_rcu(&rd->rcu, vxlan_dst_free);
   1128}
   1129
   1130static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
   1131			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
   1132			   __be32 *vni, u32 *ifindex, u32 *nhid,
   1133			   struct netlink_ext_ack *extack)
   1134{
   1135	struct net *net = dev_net(vxlan->dev);
   1136	int err;
   1137
   1138	if (tb[NDA_NH_ID] &&
   1139	    (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) {
   1140		NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");
   1141		return -EINVAL;
   1142	}
   1143
   1144	if (tb[NDA_DST]) {
   1145		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
   1146		if (err) {
   1147			NL_SET_ERR_MSG(extack, "Unsupported address family");
   1148			return err;
   1149		}
   1150	} else {
   1151		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
   1152
   1153		if (remote->sa.sa_family == AF_INET) {
   1154			ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
   1155			ip->sa.sa_family = AF_INET;
   1156#if IS_ENABLED(CONFIG_IPV6)
   1157		} else {
   1158			ip->sin6.sin6_addr = in6addr_any;
   1159			ip->sa.sa_family = AF_INET6;
   1160#endif
   1161		}
   1162	}
   1163
   1164	if (tb[NDA_PORT]) {
   1165		if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) {
   1166			NL_SET_ERR_MSG(extack, "Invalid vxlan port");
   1167			return -EINVAL;
   1168		}
   1169		*port = nla_get_be16(tb[NDA_PORT]);
   1170	} else {
   1171		*port = vxlan->cfg.dst_port;
   1172	}
   1173
   1174	if (tb[NDA_VNI]) {
   1175		if (nla_len(tb[NDA_VNI]) != sizeof(u32)) {
   1176			NL_SET_ERR_MSG(extack, "Invalid vni");
   1177			return -EINVAL;
   1178		}
   1179		*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
   1180	} else {
   1181		*vni = vxlan->default_dst.remote_vni;
   1182	}
   1183
   1184	if (tb[NDA_SRC_VNI]) {
   1185		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) {
   1186			NL_SET_ERR_MSG(extack, "Invalid src vni");
   1187			return -EINVAL;
   1188		}
   1189		*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
   1190	} else {
   1191		*src_vni = vxlan->default_dst.remote_vni;
   1192	}
   1193
   1194	if (tb[NDA_IFINDEX]) {
   1195		struct net_device *tdev;
   1196
   1197		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) {
   1198			NL_SET_ERR_MSG(extack, "Invalid ifindex");
   1199			return -EINVAL;
   1200		}
   1201		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
   1202		tdev = __dev_get_by_index(net, *ifindex);
   1203		if (!tdev) {
   1204			NL_SET_ERR_MSG(extack, "Device not found");
   1205			return -EADDRNOTAVAIL;
   1206		}
   1207	} else {
   1208		*ifindex = 0;
   1209	}
   1210
   1211	if (tb[NDA_NH_ID])
   1212		*nhid = nla_get_u32(tb[NDA_NH_ID]);
   1213	else
   1214		*nhid = 0;
   1215
   1216	return 0;
   1217}
   1218
   1219/* Add static entry (via netlink) */
   1220static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
   1221			 struct net_device *dev,
   1222			 const unsigned char *addr, u16 vid, u16 flags,
   1223			 struct netlink_ext_ack *extack)
   1224{
   1225	struct vxlan_dev *vxlan = netdev_priv(dev);
   1226	/* struct net *net = dev_net(vxlan->dev); */
   1227	union vxlan_addr ip;
   1228	__be16 port;
   1229	__be32 src_vni, vni;
   1230	u32 ifindex, nhid;
   1231	u32 hash_index;
   1232	int err;
   1233
   1234	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
   1235		pr_info("RTM_NEWNEIGH with invalid state %#x\n",
   1236			ndm->ndm_state);
   1237		return -EINVAL;
   1238	}
   1239
   1240	if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
   1241		return -EINVAL;
   1242
   1243	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
   1244			      &nhid, extack);
   1245	if (err)
   1246		return err;
   1247
   1248	if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
   1249		return -EAFNOSUPPORT;
   1250
   1251	hash_index = fdb_head_index(vxlan, addr, src_vni);
   1252	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   1253	err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
   1254			       port, src_vni, vni, ifindex,
   1255			       ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
   1256			       nhid, true, extack);
   1257	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   1258
   1259	return err;
   1260}
   1261
   1262int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
   1263		       const unsigned char *addr, union vxlan_addr ip,
   1264		       __be16 port, __be32 src_vni, __be32 vni,
   1265		       u32 ifindex, bool swdev_notify)
   1266{
   1267	struct vxlan_rdst *rd = NULL;
   1268	struct vxlan_fdb *f;
   1269	int err = -ENOENT;
   1270
   1271	f = vxlan_find_mac(vxlan, addr, src_vni);
   1272	if (!f)
   1273		return err;
   1274
   1275	if (!vxlan_addr_any(&ip)) {
   1276		rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
   1277		if (!rd)
   1278			goto out;
   1279	}
   1280
   1281	/* remove a destination if it's not the only one on the list,
   1282	 * otherwise destroy the fdb entry
   1283	 */
   1284	if (rd && !list_is_singular(&f->remotes)) {
   1285		vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
   1286		goto out;
   1287	}
   1288
   1289	vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
   1290
   1291out:
   1292	return 0;
   1293}
   1294
   1295/* Delete entry (via netlink) */
   1296static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
   1297			    struct net_device *dev,
   1298			    const unsigned char *addr, u16 vid,
   1299			    struct netlink_ext_ack *extack)
   1300{
   1301	struct vxlan_dev *vxlan = netdev_priv(dev);
   1302	union vxlan_addr ip;
   1303	__be32 src_vni, vni;
   1304	u32 ifindex, nhid;
   1305	u32 hash_index;
   1306	__be16 port;
   1307	int err;
   1308
   1309	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
   1310			      &nhid, extack);
   1311	if (err)
   1312		return err;
   1313
   1314	hash_index = fdb_head_index(vxlan, addr, src_vni);
   1315	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   1316	err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
   1317				 true);
   1318	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   1319
   1320	return err;
   1321}
   1322
   1323/* Dump forwarding table */
   1324static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
   1325			  struct net_device *dev,
   1326			  struct net_device *filter_dev, int *idx)
   1327{
   1328	struct vxlan_dev *vxlan = netdev_priv(dev);
   1329	unsigned int h;
   1330	int err = 0;
   1331
   1332	for (h = 0; h < FDB_HASH_SIZE; ++h) {
   1333		struct vxlan_fdb *f;
   1334
   1335		rcu_read_lock();
   1336		hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
   1337			struct vxlan_rdst *rd;
   1338
   1339			if (rcu_access_pointer(f->nh)) {
   1340				if (*idx < cb->args[2])
   1341					goto skip_nh;
   1342				err = vxlan_fdb_info(skb, vxlan, f,
   1343						     NETLINK_CB(cb->skb).portid,
   1344						     cb->nlh->nlmsg_seq,
   1345						     RTM_NEWNEIGH,
   1346						     NLM_F_MULTI, NULL);
   1347				if (err < 0) {
   1348					rcu_read_unlock();
   1349					goto out;
   1350				}
   1351skip_nh:
   1352				*idx += 1;
   1353				continue;
   1354			}
   1355
   1356			list_for_each_entry_rcu(rd, &f->remotes, list) {
   1357				if (*idx < cb->args[2])
   1358					goto skip;
   1359
   1360				err = vxlan_fdb_info(skb, vxlan, f,
   1361						     NETLINK_CB(cb->skb).portid,
   1362						     cb->nlh->nlmsg_seq,
   1363						     RTM_NEWNEIGH,
   1364						     NLM_F_MULTI, rd);
   1365				if (err < 0) {
   1366					rcu_read_unlock();
   1367					goto out;
   1368				}
   1369skip:
   1370				*idx += 1;
   1371			}
   1372		}
   1373		rcu_read_unlock();
   1374	}
   1375out:
   1376	return err;
   1377}
   1378
   1379static int vxlan_fdb_get(struct sk_buff *skb,
   1380			 struct nlattr *tb[],
   1381			 struct net_device *dev,
   1382			 const unsigned char *addr,
   1383			 u16 vid, u32 portid, u32 seq,
   1384			 struct netlink_ext_ack *extack)
   1385{
   1386	struct vxlan_dev *vxlan = netdev_priv(dev);
   1387	struct vxlan_fdb *f;
   1388	__be32 vni;
   1389	int err;
   1390
   1391	if (tb[NDA_VNI])
   1392		vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
   1393	else
   1394		vni = vxlan->default_dst.remote_vni;
   1395
   1396	rcu_read_lock();
   1397
   1398	f = __vxlan_find_mac(vxlan, addr, vni);
   1399	if (!f) {
   1400		NL_SET_ERR_MSG(extack, "Fdb entry not found");
   1401		err = -ENOENT;
   1402		goto errout;
   1403	}
   1404
   1405	err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
   1406			     RTM_NEWNEIGH, 0, first_remote_rcu(f));
   1407errout:
   1408	rcu_read_unlock();
   1409	return err;
   1410}
   1411
   1412/* Watch incoming packets to learn mapping between Ethernet address
   1413 * and Tunnel endpoint.
   1414 * Return true if packet is bogus and should be dropped.
   1415 */
   1416static bool vxlan_snoop(struct net_device *dev,
   1417			union vxlan_addr *src_ip, const u8 *src_mac,
   1418			u32 src_ifindex, __be32 vni)
   1419{
   1420	struct vxlan_dev *vxlan = netdev_priv(dev);
   1421	struct vxlan_fdb *f;
   1422	u32 ifindex = 0;
   1423
   1424#if IS_ENABLED(CONFIG_IPV6)
   1425	if (src_ip->sa.sa_family == AF_INET6 &&
   1426	    (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
   1427		ifindex = src_ifindex;
   1428#endif
   1429
   1430	f = vxlan_find_mac(vxlan, src_mac, vni);
   1431	if (likely(f)) {
   1432		struct vxlan_rdst *rdst = first_remote_rcu(f);
   1433
   1434		if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
   1435			   rdst->remote_ifindex == ifindex))
   1436			return false;
   1437
   1438		/* Don't migrate static entries, drop packets */
   1439		if (f->state & (NUD_PERMANENT | NUD_NOARP))
   1440			return true;
   1441
   1442		/* Don't override an fdb with nexthop with a learnt entry */
   1443		if (rcu_access_pointer(f->nh))
   1444			return true;
   1445
   1446		if (net_ratelimit())
   1447			netdev_info(dev,
   1448				    "%pM migrated from %pIS to %pIS\n",
   1449				    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
   1450
   1451		rdst->remote_ip = *src_ip;
   1452		f->updated = jiffies;
   1453		vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
   1454	} else {
   1455		u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
   1456
   1457		/* learned new entry */
   1458		spin_lock(&vxlan->hash_lock[hash_index]);
   1459
   1460		/* close off race between vxlan_flush and incoming packets */
   1461		if (netif_running(dev))
   1462			vxlan_fdb_update(vxlan, src_mac, src_ip,
   1463					 NUD_REACHABLE,
   1464					 NLM_F_EXCL|NLM_F_CREATE,
   1465					 vxlan->cfg.dst_port,
   1466					 vni,
   1467					 vxlan->default_dst.remote_vni,
   1468					 ifindex, NTF_SELF, 0, true, NULL);
   1469		spin_unlock(&vxlan->hash_lock[hash_index]);
   1470	}
   1471
   1472	return false;
   1473}
   1474
   1475static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
   1476{
   1477	struct vxlan_net *vn;
   1478
   1479	if (!vs)
   1480		return false;
   1481	if (!refcount_dec_and_test(&vs->refcnt))
   1482		return false;
   1483
   1484	vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
   1485	spin_lock(&vn->sock_lock);
   1486	hlist_del_rcu(&vs->hlist);
   1487	udp_tunnel_notify_del_rx_port(vs->sock,
   1488				      (vs->flags & VXLAN_F_GPE) ?
   1489				      UDP_TUNNEL_TYPE_VXLAN_GPE :
   1490				      UDP_TUNNEL_TYPE_VXLAN);
   1491	spin_unlock(&vn->sock_lock);
   1492
   1493	return true;
   1494}
   1495
   1496static void vxlan_sock_release(struct vxlan_dev *vxlan)
   1497{
   1498	struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
   1499#if IS_ENABLED(CONFIG_IPV6)
   1500	struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
   1501
   1502	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
   1503#endif
   1504
   1505	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
   1506	synchronize_net();
   1507
   1508	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
   1509		vxlan_vs_del_vnigrp(vxlan);
   1510	else
   1511		vxlan_vs_del_dev(vxlan);
   1512
   1513	if (__vxlan_sock_release_prep(sock4)) {
   1514		udp_tunnel_sock_release(sock4->sock);
   1515		kfree(sock4);
   1516	}
   1517
   1518#if IS_ENABLED(CONFIG_IPV6)
   1519	if (__vxlan_sock_release_prep(sock6)) {
   1520		udp_tunnel_sock_release(sock6->sock);
   1521		kfree(sock6);
   1522	}
   1523#endif
   1524}
   1525
   1526static bool vxlan_remcsum(struct vxlanhdr *unparsed,
   1527			  struct sk_buff *skb, u32 vxflags)
   1528{
   1529	size_t start, offset;
   1530
   1531	if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
   1532		goto out;
   1533
   1534	start = vxlan_rco_start(unparsed->vx_vni);
   1535	offset = start + vxlan_rco_offset(unparsed->vx_vni);
   1536
   1537	if (!pskb_may_pull(skb, offset + sizeof(u16)))
   1538		return false;
   1539
   1540	skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
   1541			    !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
   1542out:
   1543	unparsed->vx_flags &= ~VXLAN_HF_RCO;
   1544	unparsed->vx_vni &= VXLAN_VNI_MASK;
   1545	return true;
   1546}
   1547
   1548static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
   1549				struct sk_buff *skb, u32 vxflags,
   1550				struct vxlan_metadata *md)
   1551{
   1552	struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
   1553	struct metadata_dst *tun_dst;
   1554
   1555	if (!(unparsed->vx_flags & VXLAN_HF_GBP))
   1556		goto out;
   1557
   1558	md->gbp = ntohs(gbp->policy_id);
   1559
   1560	tun_dst = (struct metadata_dst *)skb_dst(skb);
   1561	if (tun_dst) {
   1562		tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
   1563		tun_dst->u.tun_info.options_len = sizeof(*md);
   1564	}
   1565	if (gbp->dont_learn)
   1566		md->gbp |= VXLAN_GBP_DONT_LEARN;
   1567
   1568	if (gbp->policy_applied)
   1569		md->gbp |= VXLAN_GBP_POLICY_APPLIED;
   1570
   1571	/* In flow-based mode, GBP is carried in dst_metadata */
   1572	if (!(vxflags & VXLAN_F_COLLECT_METADATA))
   1573		skb->mark = md->gbp;
   1574out:
   1575	unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
   1576}
   1577
   1578static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
   1579				__be16 *protocol,
   1580				struct sk_buff *skb, u32 vxflags)
   1581{
   1582	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
   1583
   1584	/* Need to have Next Protocol set for interfaces in GPE mode. */
   1585	if (!gpe->np_applied)
   1586		return false;
   1587	/* "The initial version is 0. If a receiver does not support the
   1588	 * version indicated it MUST drop the packet.
   1589	 */
   1590	if (gpe->version != 0)
   1591		return false;
   1592	/* "When the O bit is set to 1, the packet is an OAM packet and OAM
   1593	 * processing MUST occur." However, we don't implement OAM
   1594	 * processing, thus drop the packet.
   1595	 */
   1596	if (gpe->oam_flag)
   1597		return false;
   1598
   1599	*protocol = tun_p_to_eth_p(gpe->next_protocol);
   1600	if (!*protocol)
   1601		return false;
   1602
   1603	unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
   1604	return true;
   1605}
   1606
   1607static bool vxlan_set_mac(struct vxlan_dev *vxlan,
   1608			  struct vxlan_sock *vs,
   1609			  struct sk_buff *skb, __be32 vni)
   1610{
   1611	union vxlan_addr saddr;
   1612	u32 ifindex = skb->dev->ifindex;
   1613
   1614	skb_reset_mac_header(skb);
   1615	skb->protocol = eth_type_trans(skb, vxlan->dev);
   1616	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
   1617
   1618	/* Ignore packet loops (and multicast echo) */
   1619	if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
   1620		return false;
   1621
   1622	/* Get address from the outer IP header */
   1623	if (vxlan_get_sk_family(vs) == AF_INET) {
   1624		saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
   1625		saddr.sa.sa_family = AF_INET;
   1626#if IS_ENABLED(CONFIG_IPV6)
   1627	} else {
   1628		saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
   1629		saddr.sa.sa_family = AF_INET6;
   1630#endif
   1631	}
   1632
   1633	if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
   1634	    vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
   1635		return false;
   1636
   1637	return true;
   1638}
   1639
   1640static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
   1641				  struct sk_buff *skb)
   1642{
   1643	int err = 0;
   1644
   1645	if (vxlan_get_sk_family(vs) == AF_INET)
   1646		err = IP_ECN_decapsulate(oiph, skb);
   1647#if IS_ENABLED(CONFIG_IPV6)
   1648	else
   1649		err = IP6_ECN_decapsulate(oiph, skb);
   1650#endif
   1651
   1652	if (unlikely(err) && log_ecn_error) {
   1653		if (vxlan_get_sk_family(vs) == AF_INET)
   1654			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
   1655					     &((struct iphdr *)oiph)->saddr,
   1656					     ((struct iphdr *)oiph)->tos);
   1657		else
   1658			net_info_ratelimited("non-ECT from %pI6\n",
   1659					     &((struct ipv6hdr *)oiph)->saddr);
   1660	}
   1661	return err <= 1;
   1662}
   1663
   1664/* Callback from net/ipv4/udp.c to receive packets */
   1665static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
   1666{
   1667	struct vxlan_vni_node *vninode = NULL;
   1668	struct vxlan_dev *vxlan;
   1669	struct vxlan_sock *vs;
   1670	struct vxlanhdr unparsed;
   1671	struct vxlan_metadata _md;
   1672	struct vxlan_metadata *md = &_md;
   1673	__be16 protocol = htons(ETH_P_TEB);
   1674	bool raw_proto = false;
   1675	void *oiph;
   1676	__be32 vni = 0;
   1677
   1678	/* Need UDP and VXLAN header to be present */
   1679	if (!pskb_may_pull(skb, VXLAN_HLEN))
   1680		goto drop;
   1681
   1682	unparsed = *vxlan_hdr(skb);
   1683	/* VNI flag always required to be set */
   1684	if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
   1685		netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
   1686			   ntohl(vxlan_hdr(skb)->vx_flags),
   1687			   ntohl(vxlan_hdr(skb)->vx_vni));
   1688		/* Return non vxlan pkt */
   1689		goto drop;
   1690	}
   1691	unparsed.vx_flags &= ~VXLAN_HF_VNI;
   1692	unparsed.vx_vni &= ~VXLAN_VNI_MASK;
   1693
   1694	vs = rcu_dereference_sk_user_data(sk);
   1695	if (!vs)
   1696		goto drop;
   1697
   1698	vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
   1699
   1700	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
   1701	if (!vxlan)
   1702		goto drop;
   1703
   1704	/* For backwards compatibility, only allow reserved fields to be
   1705	 * used by VXLAN extensions if explicitly requested.
   1706	 */
   1707	if (vs->flags & VXLAN_F_GPE) {
   1708		if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
   1709			goto drop;
   1710		raw_proto = true;
   1711	}
   1712
   1713	if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
   1714				   !net_eq(vxlan->net, dev_net(vxlan->dev))))
   1715		goto drop;
   1716
   1717	if (vs->flags & VXLAN_F_REMCSUM_RX)
   1718		if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
   1719			goto drop;
   1720
   1721	if (vxlan_collect_metadata(vs)) {
   1722		struct metadata_dst *tun_dst;
   1723
   1724		tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
   1725					 key32_to_tunnel_id(vni), sizeof(*md));
   1726
   1727		if (!tun_dst)
   1728			goto drop;
   1729
   1730		md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
   1731
   1732		skb_dst_set(skb, (struct dst_entry *)tun_dst);
   1733	} else {
   1734		memset(md, 0, sizeof(*md));
   1735	}
   1736
   1737	if (vs->flags & VXLAN_F_GBP)
   1738		vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
   1739	/* Note that GBP and GPE can never be active together. This is
   1740	 * ensured in vxlan_dev_configure.
   1741	 */
   1742
   1743	if (unparsed.vx_flags || unparsed.vx_vni) {
   1744		/* If there are any unprocessed flags remaining treat
   1745		 * this as a malformed packet. This behavior diverges from
   1746		 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
   1747		 * in reserved fields are to be ignored. The approach here
   1748		 * maintains compatibility with previous stack code, and also
   1749		 * is more robust and provides a little more security in
   1750		 * adding extensions to VXLAN.
   1751		 */
   1752		goto drop;
   1753	}
   1754
   1755	if (!raw_proto) {
   1756		if (!vxlan_set_mac(vxlan, vs, skb, vni))
   1757			goto drop;
   1758	} else {
   1759		skb_reset_mac_header(skb);
   1760		skb->dev = vxlan->dev;
   1761		skb->pkt_type = PACKET_HOST;
   1762	}
   1763
   1764	oiph = skb_network_header(skb);
   1765	skb_reset_network_header(skb);
   1766
   1767	if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
   1768		++vxlan->dev->stats.rx_frame_errors;
   1769		++vxlan->dev->stats.rx_errors;
   1770		vxlan_vnifilter_count(vxlan, vni, vninode,
   1771				      VXLAN_VNI_STATS_RX_ERRORS, 0);
   1772		goto drop;
   1773	}
   1774
   1775	rcu_read_lock();
   1776
   1777	if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
   1778		rcu_read_unlock();
   1779		dev_core_stats_rx_dropped_inc(vxlan->dev);
   1780		vxlan_vnifilter_count(vxlan, vni, vninode,
   1781				      VXLAN_VNI_STATS_RX_DROPS, 0);
   1782		goto drop;
   1783	}
   1784
   1785	dev_sw_netstats_rx_add(vxlan->dev, skb->len);
   1786	vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len);
   1787	gro_cells_receive(&vxlan->gro_cells, skb);
   1788
   1789	rcu_read_unlock();
   1790
   1791	return 0;
   1792
   1793drop:
   1794	/* Consume bad packet */
   1795	kfree_skb(skb);
   1796	return 0;
   1797}
   1798
   1799/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
   1800static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
   1801{
   1802	struct vxlan_dev *vxlan;
   1803	struct vxlan_sock *vs;
   1804	struct vxlanhdr *hdr;
   1805	__be32 vni;
   1806
   1807	if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
   1808		return -EINVAL;
   1809
   1810	hdr = vxlan_hdr(skb);
   1811
   1812	if (!(hdr->vx_flags & VXLAN_HF_VNI))
   1813		return -EINVAL;
   1814
   1815	vs = rcu_dereference_sk_user_data(sk);
   1816	if (!vs)
   1817		return -ENOENT;
   1818
   1819	vni = vxlan_vni(hdr->vx_vni);
   1820	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL);
   1821	if (!vxlan)
   1822		return -ENOENT;
   1823
   1824	return 0;
   1825}
   1826
   1827static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
   1828{
   1829	struct vxlan_dev *vxlan = netdev_priv(dev);
   1830	struct arphdr *parp;
   1831	u8 *arpptr, *sha;
   1832	__be32 sip, tip;
   1833	struct neighbour *n;
   1834
   1835	if (dev->flags & IFF_NOARP)
   1836		goto out;
   1837
   1838	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
   1839		dev->stats.tx_dropped++;
   1840		goto out;
   1841	}
   1842	parp = arp_hdr(skb);
   1843
   1844	if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
   1845	     parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
   1846	    parp->ar_pro != htons(ETH_P_IP) ||
   1847	    parp->ar_op != htons(ARPOP_REQUEST) ||
   1848	    parp->ar_hln != dev->addr_len ||
   1849	    parp->ar_pln != 4)
   1850		goto out;
   1851	arpptr = (u8 *)parp + sizeof(struct arphdr);
   1852	sha = arpptr;
   1853	arpptr += dev->addr_len;	/* sha */
   1854	memcpy(&sip, arpptr, sizeof(sip));
   1855	arpptr += sizeof(sip);
   1856	arpptr += dev->addr_len;	/* tha */
   1857	memcpy(&tip, arpptr, sizeof(tip));
   1858
   1859	if (ipv4_is_loopback(tip) ||
   1860	    ipv4_is_multicast(tip))
   1861		goto out;
   1862
   1863	n = neigh_lookup(&arp_tbl, &tip, dev);
   1864
   1865	if (n) {
   1866		struct vxlan_fdb *f;
   1867		struct sk_buff	*reply;
   1868
   1869		if (!(n->nud_state & NUD_CONNECTED)) {
   1870			neigh_release(n);
   1871			goto out;
   1872		}
   1873
   1874		f = vxlan_find_mac(vxlan, n->ha, vni);
   1875		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
   1876			/* bridge-local neighbor */
   1877			neigh_release(n);
   1878			goto out;
   1879		}
   1880
   1881		reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
   1882				n->ha, sha);
   1883
   1884		neigh_release(n);
   1885
   1886		if (reply == NULL)
   1887			goto out;
   1888
   1889		skb_reset_mac_header(reply);
   1890		__skb_pull(reply, skb_network_offset(reply));
   1891		reply->ip_summed = CHECKSUM_UNNECESSARY;
   1892		reply->pkt_type = PACKET_HOST;
   1893
   1894		if (netif_rx(reply) == NET_RX_DROP) {
   1895			dev->stats.rx_dropped++;
   1896			vxlan_vnifilter_count(vxlan, vni, NULL,
   1897					      VXLAN_VNI_STATS_RX_DROPS, 0);
   1898		}
   1899
   1900	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
   1901		union vxlan_addr ipa = {
   1902			.sin.sin_addr.s_addr = tip,
   1903			.sin.sin_family = AF_INET,
   1904		};
   1905
   1906		vxlan_ip_miss(dev, &ipa);
   1907	}
   1908out:
   1909	consume_skb(skb);
   1910	return NETDEV_TX_OK;
   1911}
   1912
   1913#if IS_ENABLED(CONFIG_IPV6)
   1914static struct sk_buff *vxlan_na_create(struct sk_buff *request,
   1915	struct neighbour *n, bool isrouter)
   1916{
   1917	struct net_device *dev = request->dev;
   1918	struct sk_buff *reply;
   1919	struct nd_msg *ns, *na;
   1920	struct ipv6hdr *pip6;
   1921	u8 *daddr;
   1922	int na_olen = 8; /* opt hdr + ETH_ALEN for target */
   1923	int ns_olen;
   1924	int i, len;
   1925
   1926	if (dev == NULL || !pskb_may_pull(request, request->len))
   1927		return NULL;
   1928
   1929	len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
   1930		sizeof(*na) + na_olen + dev->needed_tailroom;
   1931	reply = alloc_skb(len, GFP_ATOMIC);
   1932	if (reply == NULL)
   1933		return NULL;
   1934
   1935	reply->protocol = htons(ETH_P_IPV6);
   1936	reply->dev = dev;
   1937	skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
   1938	skb_push(reply, sizeof(struct ethhdr));
   1939	skb_reset_mac_header(reply);
   1940
   1941	ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
   1942
   1943	daddr = eth_hdr(request)->h_source;
   1944	ns_olen = request->len - skb_network_offset(request) -
   1945		sizeof(struct ipv6hdr) - sizeof(*ns);
   1946	for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
   1947		if (!ns->opt[i + 1]) {
   1948			kfree_skb(reply);
   1949			return NULL;
   1950		}
   1951		if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
   1952			daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
   1953			break;
   1954		}
   1955	}
   1956
   1957	/* Ethernet header */
   1958	ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
   1959	ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
   1960	eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
   1961	reply->protocol = htons(ETH_P_IPV6);
   1962
   1963	skb_pull(reply, sizeof(struct ethhdr));
   1964	skb_reset_network_header(reply);
   1965	skb_put(reply, sizeof(struct ipv6hdr));
   1966
   1967	/* IPv6 header */
   1968
   1969	pip6 = ipv6_hdr(reply);
   1970	memset(pip6, 0, sizeof(struct ipv6hdr));
   1971	pip6->version = 6;
   1972	pip6->priority = ipv6_hdr(request)->priority;
   1973	pip6->nexthdr = IPPROTO_ICMPV6;
   1974	pip6->hop_limit = 255;
   1975	pip6->daddr = ipv6_hdr(request)->saddr;
   1976	pip6->saddr = *(struct in6_addr *)n->primary_key;
   1977
   1978	skb_pull(reply, sizeof(struct ipv6hdr));
   1979	skb_reset_transport_header(reply);
   1980
   1981	/* Neighbor Advertisement */
   1982	na = skb_put_zero(reply, sizeof(*na) + na_olen);
   1983	na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
   1984	na->icmph.icmp6_router = isrouter;
   1985	na->icmph.icmp6_override = 1;
   1986	na->icmph.icmp6_solicited = 1;
   1987	na->target = ns->target;
   1988	ether_addr_copy(&na->opt[2], n->ha);
   1989	na->opt[0] = ND_OPT_TARGET_LL_ADDR;
   1990	na->opt[1] = na_olen >> 3;
   1991
   1992	na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
   1993		&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
   1994		csum_partial(na, sizeof(*na)+na_olen, 0));
   1995
   1996	pip6->payload_len = htons(sizeof(*na)+na_olen);
   1997
   1998	skb_push(reply, sizeof(struct ipv6hdr));
   1999
   2000	reply->ip_summed = CHECKSUM_UNNECESSARY;
   2001
   2002	return reply;
   2003}
   2004
   2005static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
   2006{
   2007	struct vxlan_dev *vxlan = netdev_priv(dev);
   2008	const struct in6_addr *daddr;
   2009	const struct ipv6hdr *iphdr;
   2010	struct inet6_dev *in6_dev;
   2011	struct neighbour *n;
   2012	struct nd_msg *msg;
   2013
   2014	rcu_read_lock();
   2015	in6_dev = __in6_dev_get(dev);
   2016	if (!in6_dev)
   2017		goto out;
   2018
   2019	iphdr = ipv6_hdr(skb);
   2020	daddr = &iphdr->daddr;
   2021	msg = (struct nd_msg *)(iphdr + 1);
   2022
   2023	if (ipv6_addr_loopback(daddr) ||
   2024	    ipv6_addr_is_multicast(&msg->target))
   2025		goto out;
   2026
   2027	n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
   2028
   2029	if (n) {
   2030		struct vxlan_fdb *f;
   2031		struct sk_buff *reply;
   2032
   2033		if (!(n->nud_state & NUD_CONNECTED)) {
   2034			neigh_release(n);
   2035			goto out;
   2036		}
   2037
   2038		f = vxlan_find_mac(vxlan, n->ha, vni);
   2039		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
   2040			/* bridge-local neighbor */
   2041			neigh_release(n);
   2042			goto out;
   2043		}
   2044
   2045		reply = vxlan_na_create(skb, n,
   2046					!!(f ? f->flags & NTF_ROUTER : 0));
   2047
   2048		neigh_release(n);
   2049
   2050		if (reply == NULL)
   2051			goto out;
   2052
   2053		if (netif_rx(reply) == NET_RX_DROP) {
   2054			dev->stats.rx_dropped++;
   2055			vxlan_vnifilter_count(vxlan, vni, NULL,
   2056					      VXLAN_VNI_STATS_RX_DROPS, 0);
   2057		}
   2058	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
   2059		union vxlan_addr ipa = {
   2060			.sin6.sin6_addr = msg->target,
   2061			.sin6.sin6_family = AF_INET6,
   2062		};
   2063
   2064		vxlan_ip_miss(dev, &ipa);
   2065	}
   2066
   2067out:
   2068	rcu_read_unlock();
   2069	consume_skb(skb);
   2070	return NETDEV_TX_OK;
   2071}
   2072#endif
   2073
   2074static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
   2075{
   2076	struct vxlan_dev *vxlan = netdev_priv(dev);
   2077	struct neighbour *n;
   2078
   2079	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
   2080		return false;
   2081
   2082	n = NULL;
   2083	switch (ntohs(eth_hdr(skb)->h_proto)) {
   2084	case ETH_P_IP:
   2085	{
   2086		struct iphdr *pip;
   2087
   2088		if (!pskb_may_pull(skb, sizeof(struct iphdr)))
   2089			return false;
   2090		pip = ip_hdr(skb);
   2091		n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
   2092		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
   2093			union vxlan_addr ipa = {
   2094				.sin.sin_addr.s_addr = pip->daddr,
   2095				.sin.sin_family = AF_INET,
   2096			};
   2097
   2098			vxlan_ip_miss(dev, &ipa);
   2099			return false;
   2100		}
   2101
   2102		break;
   2103	}
   2104#if IS_ENABLED(CONFIG_IPV6)
   2105	case ETH_P_IPV6:
   2106	{
   2107		struct ipv6hdr *pip6;
   2108
   2109		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
   2110			return false;
   2111		pip6 = ipv6_hdr(skb);
   2112		n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
   2113		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
   2114			union vxlan_addr ipa = {
   2115				.sin6.sin6_addr = pip6->daddr,
   2116				.sin6.sin6_family = AF_INET6,
   2117			};
   2118
   2119			vxlan_ip_miss(dev, &ipa);
   2120			return false;
   2121		}
   2122
   2123		break;
   2124	}
   2125#endif
   2126	default:
   2127		return false;
   2128	}
   2129
   2130	if (n) {
   2131		bool diff;
   2132
   2133		diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
   2134		if (diff) {
   2135			memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
   2136				dev->addr_len);
   2137			memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
   2138		}
   2139		neigh_release(n);
   2140		return diff;
   2141	}
   2142
   2143	return false;
   2144}
   2145
   2146static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
   2147				struct vxlan_metadata *md)
   2148{
   2149	struct vxlanhdr_gbp *gbp;
   2150
   2151	if (!md->gbp)
   2152		return;
   2153
   2154	gbp = (struct vxlanhdr_gbp *)vxh;
   2155	vxh->vx_flags |= VXLAN_HF_GBP;
   2156
   2157	if (md->gbp & VXLAN_GBP_DONT_LEARN)
   2158		gbp->dont_learn = 1;
   2159
   2160	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
   2161		gbp->policy_applied = 1;
   2162
   2163	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
   2164}
   2165
   2166static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
   2167			       __be16 protocol)
   2168{
   2169	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
   2170
   2171	gpe->np_applied = 1;
   2172	gpe->next_protocol = tun_p_from_eth_p(protocol);
   2173	if (!gpe->next_protocol)
   2174		return -EPFNOSUPPORT;
   2175	return 0;
   2176}
   2177
   2178static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
   2179			   int iphdr_len, __be32 vni,
   2180			   struct vxlan_metadata *md, u32 vxflags,
   2181			   bool udp_sum)
   2182{
   2183	struct vxlanhdr *vxh;
   2184	int min_headroom;
   2185	int err;
   2186	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
   2187	__be16 inner_protocol = htons(ETH_P_TEB);
   2188
   2189	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
   2190	    skb->ip_summed == CHECKSUM_PARTIAL) {
   2191		int csum_start = skb_checksum_start_offset(skb);
   2192
   2193		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
   2194		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
   2195		    (skb->csum_offset == offsetof(struct udphdr, check) ||
   2196		     skb->csum_offset == offsetof(struct tcphdr, check)))
   2197			type |= SKB_GSO_TUNNEL_REMCSUM;
   2198	}
   2199
   2200	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
   2201			+ VXLAN_HLEN + iphdr_len;
   2202
   2203	/* Need space for new headers (invalidates iph ptr) */
   2204	err = skb_cow_head(skb, min_headroom);
   2205	if (unlikely(err))
   2206		return err;
   2207
   2208	err = iptunnel_handle_offloads(skb, type);
   2209	if (err)
   2210		return err;
   2211
   2212	vxh = __skb_push(skb, sizeof(*vxh));
   2213	vxh->vx_flags = VXLAN_HF_VNI;
   2214	vxh->vx_vni = vxlan_vni_field(vni);
   2215
   2216	if (type & SKB_GSO_TUNNEL_REMCSUM) {
   2217		unsigned int start;
   2218
   2219		start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
   2220		vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
   2221		vxh->vx_flags |= VXLAN_HF_RCO;
   2222
   2223		if (!skb_is_gso(skb)) {
   2224			skb->ip_summed = CHECKSUM_NONE;
   2225			skb->encapsulation = 0;
   2226		}
   2227	}
   2228
   2229	if (vxflags & VXLAN_F_GBP)
   2230		vxlan_build_gbp_hdr(vxh, vxflags, md);
   2231	if (vxflags & VXLAN_F_GPE) {
   2232		err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
   2233		if (err < 0)
   2234			return err;
   2235		inner_protocol = skb->protocol;
   2236	}
   2237
   2238	skb_set_inner_protocol(skb, inner_protocol);
   2239	return 0;
   2240}
   2241
   2242static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
   2243				      struct vxlan_sock *sock4,
   2244				      struct sk_buff *skb, int oif, u8 tos,
   2245				      __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
   2246				      struct dst_cache *dst_cache,
   2247				      const struct ip_tunnel_info *info)
   2248{
   2249	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
   2250	struct rtable *rt = NULL;
   2251	struct flowi4 fl4;
   2252
   2253	if (!sock4)
   2254		return ERR_PTR(-EIO);
   2255
   2256	if (tos && !info)
   2257		use_cache = false;
   2258	if (use_cache) {
   2259		rt = dst_cache_get_ip4(dst_cache, saddr);
   2260		if (rt)
   2261			return rt;
   2262	}
   2263
   2264	memset(&fl4, 0, sizeof(fl4));
   2265	fl4.flowi4_oif = oif;
   2266	fl4.flowi4_tos = RT_TOS(tos);
   2267	fl4.flowi4_mark = skb->mark;
   2268	fl4.flowi4_proto = IPPROTO_UDP;
   2269	fl4.daddr = daddr;
   2270	fl4.saddr = *saddr;
   2271	fl4.fl4_dport = dport;
   2272	fl4.fl4_sport = sport;
   2273
   2274	rt = ip_route_output_key(vxlan->net, &fl4);
   2275	if (!IS_ERR(rt)) {
   2276		if (rt->dst.dev == dev) {
   2277			netdev_dbg(dev, "circular route to %pI4\n", &daddr);
   2278			ip_rt_put(rt);
   2279			return ERR_PTR(-ELOOP);
   2280		}
   2281
   2282		*saddr = fl4.saddr;
   2283		if (use_cache)
   2284			dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
   2285	} else {
   2286		netdev_dbg(dev, "no route to %pI4\n", &daddr);
   2287		return ERR_PTR(-ENETUNREACH);
   2288	}
   2289	return rt;
   2290}
   2291
   2292#if IS_ENABLED(CONFIG_IPV6)
   2293static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
   2294					  struct net_device *dev,
   2295					  struct vxlan_sock *sock6,
   2296					  struct sk_buff *skb, int oif, u8 tos,
   2297					  __be32 label,
   2298					  const struct in6_addr *daddr,
   2299					  struct in6_addr *saddr,
   2300					  __be16 dport, __be16 sport,
   2301					  struct dst_cache *dst_cache,
   2302					  const struct ip_tunnel_info *info)
   2303{
   2304	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
   2305	struct dst_entry *ndst;
   2306	struct flowi6 fl6;
   2307
   2308	if (!sock6)
   2309		return ERR_PTR(-EIO);
   2310
   2311	if (tos && !info)
   2312		use_cache = false;
   2313	if (use_cache) {
   2314		ndst = dst_cache_get_ip6(dst_cache, saddr);
   2315		if (ndst)
   2316			return ndst;
   2317	}
   2318
   2319	memset(&fl6, 0, sizeof(fl6));
   2320	fl6.flowi6_oif = oif;
   2321	fl6.daddr = *daddr;
   2322	fl6.saddr = *saddr;
   2323	fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
   2324	fl6.flowi6_mark = skb->mark;
   2325	fl6.flowi6_proto = IPPROTO_UDP;
   2326	fl6.fl6_dport = dport;
   2327	fl6.fl6_sport = sport;
   2328
   2329	ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
   2330					       &fl6, NULL);
   2331	if (IS_ERR(ndst)) {
   2332		netdev_dbg(dev, "no route to %pI6\n", daddr);
   2333		return ERR_PTR(-ENETUNREACH);
   2334	}
   2335
   2336	if (unlikely(ndst->dev == dev)) {
   2337		netdev_dbg(dev, "circular route to %pI6\n", daddr);
   2338		dst_release(ndst);
   2339		return ERR_PTR(-ELOOP);
   2340	}
   2341
   2342	*saddr = fl6.saddr;
   2343	if (use_cache)
   2344		dst_cache_set_ip6(dst_cache, ndst, saddr);
   2345	return ndst;
   2346}
   2347#endif
   2348
   2349/* Bypass encapsulation if the destination is local */
   2350static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
   2351			       struct vxlan_dev *dst_vxlan, __be32 vni,
   2352			       bool snoop)
   2353{
   2354	struct pcpu_sw_netstats *tx_stats, *rx_stats;
   2355	union vxlan_addr loopback;
   2356	union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
   2357	struct net_device *dev;
   2358	int len = skb->len;
   2359
   2360	tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
   2361	rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
   2362	skb->pkt_type = PACKET_HOST;
   2363	skb->encapsulation = 0;
   2364	skb->dev = dst_vxlan->dev;
   2365	__skb_pull(skb, skb_network_offset(skb));
   2366
   2367	if (remote_ip->sa.sa_family == AF_INET) {
   2368		loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
   2369		loopback.sa.sa_family =  AF_INET;
   2370#if IS_ENABLED(CONFIG_IPV6)
   2371	} else {
   2372		loopback.sin6.sin6_addr = in6addr_loopback;
   2373		loopback.sa.sa_family =  AF_INET6;
   2374#endif
   2375	}
   2376
   2377	rcu_read_lock();
   2378	dev = skb->dev;
   2379	if (unlikely(!(dev->flags & IFF_UP))) {
   2380		kfree_skb(skb);
   2381		goto drop;
   2382	}
   2383
   2384	if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
   2385		vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
   2386
   2387	u64_stats_update_begin(&tx_stats->syncp);
   2388	tx_stats->tx_packets++;
   2389	tx_stats->tx_bytes += len;
   2390	u64_stats_update_end(&tx_stats->syncp);
   2391	vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len);
   2392
   2393	if (__netif_rx(skb) == NET_RX_SUCCESS) {
   2394		u64_stats_update_begin(&rx_stats->syncp);
   2395		rx_stats->rx_packets++;
   2396		rx_stats->rx_bytes += len;
   2397		u64_stats_update_end(&rx_stats->syncp);
   2398		vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX,
   2399				      len);
   2400	} else {
   2401drop:
   2402		dev->stats.rx_dropped++;
   2403		vxlan_vnifilter_count(dst_vxlan, vni, NULL,
   2404				      VXLAN_VNI_STATS_RX_DROPS, 0);
   2405	}
   2406	rcu_read_unlock();
   2407}
   2408
   2409static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
   2410				 struct vxlan_dev *vxlan,
   2411				 union vxlan_addr *daddr,
   2412				 __be16 dst_port, int dst_ifindex, __be32 vni,
   2413				 struct dst_entry *dst,
   2414				 u32 rt_flags)
   2415{
   2416#if IS_ENABLED(CONFIG_IPV6)
   2417	/* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
   2418	 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
   2419	 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
   2420	 */
   2421	BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
   2422#endif
   2423	/* Bypass encapsulation if the destination is local */
   2424	if (rt_flags & RTCF_LOCAL &&
   2425	    !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
   2426		struct vxlan_dev *dst_vxlan;
   2427
   2428		dst_release(dst);
   2429		dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
   2430					   daddr->sa.sa_family, dst_port,
   2431					   vxlan->cfg.flags);
   2432		if (!dst_vxlan) {
   2433			dev->stats.tx_errors++;
   2434			vxlan_vnifilter_count(vxlan, vni, NULL,
   2435					      VXLAN_VNI_STATS_TX_ERRORS, 0);
   2436			kfree_skb(skb);
   2437
   2438			return -ENOENT;
   2439		}
   2440		vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
   2441		return 1;
   2442	}
   2443
   2444	return 0;
   2445}
   2446
   2447static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
   2448			   __be32 default_vni, struct vxlan_rdst *rdst,
   2449			   bool did_rsc)
   2450{
   2451	struct dst_cache *dst_cache;
   2452	struct ip_tunnel_info *info;
   2453	struct vxlan_dev *vxlan = netdev_priv(dev);
   2454	const struct iphdr *old_iph = ip_hdr(skb);
   2455	union vxlan_addr *dst;
   2456	union vxlan_addr remote_ip, local_ip;
   2457	struct vxlan_metadata _md;
   2458	struct vxlan_metadata *md = &_md;
   2459	unsigned int pkt_len = skb->len;
   2460	__be16 src_port = 0, dst_port;
   2461	struct dst_entry *ndst = NULL;
   2462	__u8 tos, ttl;
   2463	int ifindex;
   2464	int err;
   2465	u32 flags = vxlan->cfg.flags;
   2466	bool udp_sum = false;
   2467	bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
   2468	__be32 vni = 0;
   2469#if IS_ENABLED(CONFIG_IPV6)
   2470	__be32 label;
   2471#endif
   2472
   2473	info = skb_tunnel_info(skb);
   2474
   2475	if (rdst) {
   2476		dst = &rdst->remote_ip;
   2477		if (vxlan_addr_any(dst)) {
   2478			if (did_rsc) {
   2479				/* short-circuited back to local bridge */
   2480				vxlan_encap_bypass(skb, vxlan, vxlan,
   2481						   default_vni, true);
   2482				return;
   2483			}
   2484			goto drop;
   2485		}
   2486
   2487		dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
   2488		vni = (rdst->remote_vni) ? : default_vni;
   2489		ifindex = rdst->remote_ifindex;
   2490		local_ip = vxlan->cfg.saddr;
   2491		dst_cache = &rdst->dst_cache;
   2492		md->gbp = skb->mark;
   2493		if (flags & VXLAN_F_TTL_INHERIT) {
   2494			ttl = ip_tunnel_get_ttl(old_iph, skb);
   2495		} else {
   2496			ttl = vxlan->cfg.ttl;
   2497			if (!ttl && vxlan_addr_multicast(dst))
   2498				ttl = 1;
   2499		}
   2500
   2501		tos = vxlan->cfg.tos;
   2502		if (tos == 1)
   2503			tos = ip_tunnel_get_dsfield(old_iph, skb);
   2504
   2505		if (dst->sa.sa_family == AF_INET)
   2506			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
   2507		else
   2508			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
   2509#if IS_ENABLED(CONFIG_IPV6)
   2510		label = vxlan->cfg.label;
   2511#endif
   2512	} else {
   2513		if (!info) {
   2514			WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
   2515				  dev->name);
   2516			goto drop;
   2517		}
   2518		remote_ip.sa.sa_family = ip_tunnel_info_af(info);
   2519		if (remote_ip.sa.sa_family == AF_INET) {
   2520			remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
   2521			local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
   2522		} else {
   2523			remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
   2524			local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
   2525		}
   2526		dst = &remote_ip;
   2527		dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
   2528		vni = tunnel_id_to_key32(info->key.tun_id);
   2529		ifindex = 0;
   2530		dst_cache = &info->dst_cache;
   2531		if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
   2532			if (info->options_len < sizeof(*md))
   2533				goto drop;
   2534			md = ip_tunnel_info_opts(info);
   2535		}
   2536		ttl = info->key.ttl;
   2537		tos = info->key.tos;
   2538#if IS_ENABLED(CONFIG_IPV6)
   2539		label = info->key.label;
   2540#endif
   2541		udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
   2542	}
   2543	src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
   2544				     vxlan->cfg.port_max, true);
   2545
   2546	rcu_read_lock();
   2547	if (dst->sa.sa_family == AF_INET) {
   2548		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
   2549		struct rtable *rt;
   2550		__be16 df = 0;
   2551
   2552		if (!ifindex)
   2553			ifindex = sock4->sock->sk->sk_bound_dev_if;
   2554
   2555		rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
   2556				     dst->sin.sin_addr.s_addr,
   2557				     &local_ip.sin.sin_addr.s_addr,
   2558				     dst_port, src_port,
   2559				     dst_cache, info);
   2560		if (IS_ERR(rt)) {
   2561			err = PTR_ERR(rt);
   2562			goto tx_error;
   2563		}
   2564
   2565		if (!info) {
   2566			/* Bypass encapsulation if the destination is local */
   2567			err = encap_bypass_if_local(skb, dev, vxlan, dst,
   2568						    dst_port, ifindex, vni,
   2569						    &rt->dst, rt->rt_flags);
   2570			if (err)
   2571				goto out_unlock;
   2572
   2573			if (vxlan->cfg.df == VXLAN_DF_SET) {
   2574				df = htons(IP_DF);
   2575			} else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
   2576				struct ethhdr *eth = eth_hdr(skb);
   2577
   2578				if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
   2579				    (ntohs(eth->h_proto) == ETH_P_IP &&
   2580				     old_iph->frag_off & htons(IP_DF)))
   2581					df = htons(IP_DF);
   2582			}
   2583		} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
   2584			df = htons(IP_DF);
   2585		}
   2586
   2587		ndst = &rt->dst;
   2588		err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
   2589					    netif_is_any_bridge_port(dev));
   2590		if (err < 0) {
   2591			goto tx_error;
   2592		} else if (err) {
   2593			if (info) {
   2594				struct ip_tunnel_info *unclone;
   2595				struct in_addr src, dst;
   2596
   2597				unclone = skb_tunnel_info_unclone(skb);
   2598				if (unlikely(!unclone))
   2599					goto tx_error;
   2600
   2601				src = remote_ip.sin.sin_addr;
   2602				dst = local_ip.sin.sin_addr;
   2603				unclone->key.u.ipv4.src = src.s_addr;
   2604				unclone->key.u.ipv4.dst = dst.s_addr;
   2605			}
   2606			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
   2607			dst_release(ndst);
   2608			goto out_unlock;
   2609		}
   2610
   2611		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
   2612		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
   2613		err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
   2614				      vni, md, flags, udp_sum);
   2615		if (err < 0)
   2616			goto tx_error;
   2617
   2618		udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
   2619				    dst->sin.sin_addr.s_addr, tos, ttl, df,
   2620				    src_port, dst_port, xnet, !udp_sum);
   2621#if IS_ENABLED(CONFIG_IPV6)
   2622	} else {
   2623		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
   2624
   2625		if (!ifindex)
   2626			ifindex = sock6->sock->sk->sk_bound_dev_if;
   2627
   2628		ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
   2629					label, &dst->sin6.sin6_addr,
   2630					&local_ip.sin6.sin6_addr,
   2631					dst_port, src_port,
   2632					dst_cache, info);
   2633		if (IS_ERR(ndst)) {
   2634			err = PTR_ERR(ndst);
   2635			ndst = NULL;
   2636			goto tx_error;
   2637		}
   2638
   2639		if (!info) {
   2640			u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
   2641
   2642			err = encap_bypass_if_local(skb, dev, vxlan, dst,
   2643						    dst_port, ifindex, vni,
   2644						    ndst, rt6i_flags);
   2645			if (err)
   2646				goto out_unlock;
   2647		}
   2648
   2649		err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
   2650					    netif_is_any_bridge_port(dev));
   2651		if (err < 0) {
   2652			goto tx_error;
   2653		} else if (err) {
   2654			if (info) {
   2655				struct ip_tunnel_info *unclone;
   2656				struct in6_addr src, dst;
   2657
   2658				unclone = skb_tunnel_info_unclone(skb);
   2659				if (unlikely(!unclone))
   2660					goto tx_error;
   2661
   2662				src = remote_ip.sin6.sin6_addr;
   2663				dst = local_ip.sin6.sin6_addr;
   2664				unclone->key.u.ipv6.src = src;
   2665				unclone->key.u.ipv6.dst = dst;
   2666			}
   2667
   2668			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
   2669			dst_release(ndst);
   2670			goto out_unlock;
   2671		}
   2672
   2673		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
   2674		ttl = ttl ? : ip6_dst_hoplimit(ndst);
   2675		skb_scrub_packet(skb, xnet);
   2676		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
   2677				      vni, md, flags, udp_sum);
   2678		if (err < 0)
   2679			goto tx_error;
   2680
   2681		udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
   2682				     &local_ip.sin6.sin6_addr,
   2683				     &dst->sin6.sin6_addr, tos, ttl,
   2684				     label, src_port, dst_port, !udp_sum);
   2685#endif
   2686	}
   2687	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len);
   2688out_unlock:
   2689	rcu_read_unlock();
   2690	return;
   2691
   2692drop:
   2693	dev->stats.tx_dropped++;
   2694	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
   2695	dev_kfree_skb(skb);
   2696	return;
   2697
   2698tx_error:
   2699	rcu_read_unlock();
   2700	if (err == -ELOOP)
   2701		dev->stats.collisions++;
   2702	else if (err == -ENETUNREACH)
   2703		dev->stats.tx_carrier_errors++;
   2704	dst_release(ndst);
   2705	dev->stats.tx_errors++;
   2706	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
   2707	kfree_skb(skb);
   2708}
   2709
   2710static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
   2711			  struct vxlan_fdb *f, __be32 vni, bool did_rsc)
   2712{
   2713	struct vxlan_rdst nh_rdst;
   2714	struct nexthop *nh;
   2715	bool do_xmit;
   2716	u32 hash;
   2717
   2718	memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
   2719	hash = skb_get_hash(skb);
   2720
   2721	rcu_read_lock();
   2722	nh = rcu_dereference(f->nh);
   2723	if (!nh) {
   2724		rcu_read_unlock();
   2725		goto drop;
   2726	}
   2727	do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
   2728	rcu_read_unlock();
   2729
   2730	if (likely(do_xmit))
   2731		vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
   2732	else
   2733		goto drop;
   2734
   2735	return;
   2736
   2737drop:
   2738	dev->stats.tx_dropped++;
   2739	vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
   2740			      VXLAN_VNI_STATS_TX_DROPS, 0);
   2741	dev_kfree_skb(skb);
   2742}
   2743
   2744/* Transmit local packets over Vxlan
   2745 *
   2746 * Outer IP header inherits ECN and DF from inner header.
   2747 * Outer UDP destination is the VXLAN assigned port.
   2748 *           source port is based on hash of flow
   2749 */
   2750static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
   2751{
   2752	struct vxlan_dev *vxlan = netdev_priv(dev);
   2753	struct vxlan_rdst *rdst, *fdst = NULL;
   2754	const struct ip_tunnel_info *info;
   2755	bool did_rsc = false;
   2756	struct vxlan_fdb *f;
   2757	struct ethhdr *eth;
   2758	__be32 vni = 0;
   2759
   2760	info = skb_tunnel_info(skb);
   2761
   2762	skb_reset_mac_header(skb);
   2763
   2764	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
   2765		if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
   2766		    info->mode & IP_TUNNEL_INFO_TX) {
   2767			vni = tunnel_id_to_key32(info->key.tun_id);
   2768		} else {
   2769			if (info && info->mode & IP_TUNNEL_INFO_TX)
   2770				vxlan_xmit_one(skb, dev, vni, NULL, false);
   2771			else
   2772				kfree_skb(skb);
   2773			return NETDEV_TX_OK;
   2774		}
   2775	}
   2776
   2777	if (vxlan->cfg.flags & VXLAN_F_PROXY) {
   2778		eth = eth_hdr(skb);
   2779		if (ntohs(eth->h_proto) == ETH_P_ARP)
   2780			return arp_reduce(dev, skb, vni);
   2781#if IS_ENABLED(CONFIG_IPV6)
   2782		else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
   2783			 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
   2784					    sizeof(struct nd_msg)) &&
   2785			 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
   2786			struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
   2787
   2788			if (m->icmph.icmp6_code == 0 &&
   2789			    m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
   2790				return neigh_reduce(dev, skb, vni);
   2791		}
   2792#endif
   2793	}
   2794
   2795	eth = eth_hdr(skb);
   2796	f = vxlan_find_mac(vxlan, eth->h_dest, vni);
   2797	did_rsc = false;
   2798
   2799	if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
   2800	    (ntohs(eth->h_proto) == ETH_P_IP ||
   2801	     ntohs(eth->h_proto) == ETH_P_IPV6)) {
   2802		did_rsc = route_shortcircuit(dev, skb);
   2803		if (did_rsc)
   2804			f = vxlan_find_mac(vxlan, eth->h_dest, vni);
   2805	}
   2806
   2807	if (f == NULL) {
   2808		f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
   2809		if (f == NULL) {
   2810			if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
   2811			    !is_multicast_ether_addr(eth->h_dest))
   2812				vxlan_fdb_miss(vxlan, eth->h_dest);
   2813
   2814			dev->stats.tx_dropped++;
   2815			vxlan_vnifilter_count(vxlan, vni, NULL,
   2816					      VXLAN_VNI_STATS_TX_DROPS, 0);
   2817			kfree_skb(skb);
   2818			return NETDEV_TX_OK;
   2819		}
   2820	}
   2821
   2822	if (rcu_access_pointer(f->nh)) {
   2823		vxlan_xmit_nh(skb, dev, f,
   2824			      (vni ? : vxlan->default_dst.remote_vni), did_rsc);
   2825	} else {
   2826		list_for_each_entry_rcu(rdst, &f->remotes, list) {
   2827			struct sk_buff *skb1;
   2828
   2829			if (!fdst) {
   2830				fdst = rdst;
   2831				continue;
   2832			}
   2833			skb1 = skb_clone(skb, GFP_ATOMIC);
   2834			if (skb1)
   2835				vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
   2836		}
   2837		if (fdst)
   2838			vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
   2839		else
   2840			kfree_skb(skb);
   2841	}
   2842
   2843	return NETDEV_TX_OK;
   2844}
   2845
   2846/* Walk the forwarding table and purge stale entries */
   2847static void vxlan_cleanup(struct timer_list *t)
   2848{
   2849	struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
   2850	unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
   2851	unsigned int h;
   2852
   2853	if (!netif_running(vxlan->dev))
   2854		return;
   2855
   2856	for (h = 0; h < FDB_HASH_SIZE; ++h) {
   2857		struct hlist_node *p, *n;
   2858
   2859		spin_lock(&vxlan->hash_lock[h]);
   2860		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
   2861			struct vxlan_fdb *f
   2862				= container_of(p, struct vxlan_fdb, hlist);
   2863			unsigned long timeout;
   2864
   2865			if (f->state & (NUD_PERMANENT | NUD_NOARP))
   2866				continue;
   2867
   2868			if (f->flags & NTF_EXT_LEARNED)
   2869				continue;
   2870
   2871			timeout = f->used + vxlan->cfg.age_interval * HZ;
   2872			if (time_before_eq(timeout, jiffies)) {
   2873				netdev_dbg(vxlan->dev,
   2874					   "garbage collect %pM\n",
   2875					   f->eth_addr);
   2876				f->state = NUD_STALE;
   2877				vxlan_fdb_destroy(vxlan, f, true, true);
   2878			} else if (time_before(timeout, next_timer))
   2879				next_timer = timeout;
   2880		}
   2881		spin_unlock(&vxlan->hash_lock[h]);
   2882	}
   2883
   2884	mod_timer(&vxlan->age_timer, next_timer);
   2885}
   2886
   2887static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
   2888{
   2889	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
   2890
   2891	spin_lock(&vn->sock_lock);
   2892	hlist_del_init_rcu(&vxlan->hlist4.hlist);
   2893#if IS_ENABLED(CONFIG_IPV6)
   2894	hlist_del_init_rcu(&vxlan->hlist6.hlist);
   2895#endif
   2896	spin_unlock(&vn->sock_lock);
   2897}
   2898
   2899static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
   2900			     struct vxlan_dev_node *node)
   2901{
   2902	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
   2903	__be32 vni = vxlan->default_dst.remote_vni;
   2904
   2905	node->vxlan = vxlan;
   2906	spin_lock(&vn->sock_lock);
   2907	hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
   2908	spin_unlock(&vn->sock_lock);
   2909}
   2910
   2911/* Setup stats when device is created */
   2912static int vxlan_init(struct net_device *dev)
   2913{
   2914	struct vxlan_dev *vxlan = netdev_priv(dev);
   2915	int err;
   2916
   2917	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
   2918		vxlan_vnigroup_init(vxlan);
   2919
   2920	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
   2921	if (!dev->tstats)
   2922		return -ENOMEM;
   2923
   2924	err = gro_cells_init(&vxlan->gro_cells, dev);
   2925	if (err) {
   2926		free_percpu(dev->tstats);
   2927		return err;
   2928	}
   2929
   2930	return 0;
   2931}
   2932
   2933static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
   2934{
   2935	struct vxlan_fdb *f;
   2936	u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
   2937
   2938	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   2939	f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
   2940	if (f)
   2941		vxlan_fdb_destroy(vxlan, f, true, true);
   2942	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   2943}
   2944
   2945static void vxlan_uninit(struct net_device *dev)
   2946{
   2947	struct vxlan_dev *vxlan = netdev_priv(dev);
   2948
   2949	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
   2950		vxlan_vnigroup_uninit(vxlan);
   2951
   2952	gro_cells_destroy(&vxlan->gro_cells);
   2953
   2954	vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
   2955
   2956	free_percpu(dev->tstats);
   2957}
   2958
   2959/* Start ageing timer and join group when device is brought up */
   2960static int vxlan_open(struct net_device *dev)
   2961{
   2962	struct vxlan_dev *vxlan = netdev_priv(dev);
   2963	int ret;
   2964
   2965	ret = vxlan_sock_add(vxlan);
   2966	if (ret < 0)
   2967		return ret;
   2968
   2969	ret = vxlan_multicast_join(vxlan);
   2970	if (ret) {
   2971		vxlan_sock_release(vxlan);
   2972		return ret;
   2973	}
   2974
   2975	if (vxlan->cfg.age_interval)
   2976		mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
   2977
   2978	return ret;
   2979}
   2980
   2981/* Purge the forwarding table */
   2982static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
   2983{
   2984	unsigned int h;
   2985
   2986	for (h = 0; h < FDB_HASH_SIZE; ++h) {
   2987		struct hlist_node *p, *n;
   2988
   2989		spin_lock_bh(&vxlan->hash_lock[h]);
   2990		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
   2991			struct vxlan_fdb *f
   2992				= container_of(p, struct vxlan_fdb, hlist);
   2993			if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
   2994				continue;
   2995			/* the all_zeros_mac entry is deleted at vxlan_uninit */
   2996			if (is_zero_ether_addr(f->eth_addr) &&
   2997			    f->vni == vxlan->cfg.vni)
   2998				continue;
   2999			vxlan_fdb_destroy(vxlan, f, true, true);
   3000		}
   3001		spin_unlock_bh(&vxlan->hash_lock[h]);
   3002	}
   3003}
   3004
   3005/* Cleanup timer and forwarding table on shutdown */
   3006static int vxlan_stop(struct net_device *dev)
   3007{
   3008	struct vxlan_dev *vxlan = netdev_priv(dev);
   3009
   3010	vxlan_multicast_leave(vxlan);
   3011
   3012	del_timer_sync(&vxlan->age_timer);
   3013
   3014	vxlan_flush(vxlan, false);
   3015	vxlan_sock_release(vxlan);
   3016
   3017	return 0;
   3018}
   3019
   3020/* Stub, nothing needs to be done. */
   3021static void vxlan_set_multicast_list(struct net_device *dev)
   3022{
   3023}
   3024
   3025static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
   3026{
   3027	struct vxlan_dev *vxlan = netdev_priv(dev);
   3028	struct vxlan_rdst *dst = &vxlan->default_dst;
   3029	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
   3030							 dst->remote_ifindex);
   3031	bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
   3032
   3033	/* This check is different than dev->max_mtu, because it looks at
   3034	 * the lowerdev->mtu, rather than the static dev->max_mtu
   3035	 */
   3036	if (lowerdev) {
   3037		int max_mtu = lowerdev->mtu -
   3038			      (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
   3039		if (new_mtu > max_mtu)
   3040			return -EINVAL;
   3041	}
   3042
   3043	dev->mtu = new_mtu;
   3044	return 0;
   3045}
   3046
   3047static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
   3048{
   3049	struct vxlan_dev *vxlan = netdev_priv(dev);
   3050	struct ip_tunnel_info *info = skb_tunnel_info(skb);
   3051	__be16 sport, dport;
   3052
   3053	sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
   3054				  vxlan->cfg.port_max, true);
   3055	dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
   3056
   3057	if (ip_tunnel_info_af(info) == AF_INET) {
   3058		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
   3059		struct rtable *rt;
   3060
   3061		rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
   3062				     info->key.u.ipv4.dst,
   3063				     &info->key.u.ipv4.src, dport, sport,
   3064				     &info->dst_cache, info);
   3065		if (IS_ERR(rt))
   3066			return PTR_ERR(rt);
   3067		ip_rt_put(rt);
   3068	} else {
   3069#if IS_ENABLED(CONFIG_IPV6)
   3070		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
   3071		struct dst_entry *ndst;
   3072
   3073		ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
   3074					info->key.label, &info->key.u.ipv6.dst,
   3075					&info->key.u.ipv6.src, dport, sport,
   3076					&info->dst_cache, info);
   3077		if (IS_ERR(ndst))
   3078			return PTR_ERR(ndst);
   3079		dst_release(ndst);
   3080#else /* !CONFIG_IPV6 */
   3081		return -EPFNOSUPPORT;
   3082#endif
   3083	}
   3084	info->key.tp_src = sport;
   3085	info->key.tp_dst = dport;
   3086	return 0;
   3087}
   3088
   3089static const struct net_device_ops vxlan_netdev_ether_ops = {
   3090	.ndo_init		= vxlan_init,
   3091	.ndo_uninit		= vxlan_uninit,
   3092	.ndo_open		= vxlan_open,
   3093	.ndo_stop		= vxlan_stop,
   3094	.ndo_start_xmit		= vxlan_xmit,
   3095	.ndo_get_stats64	= dev_get_tstats64,
   3096	.ndo_set_rx_mode	= vxlan_set_multicast_list,
   3097	.ndo_change_mtu		= vxlan_change_mtu,
   3098	.ndo_validate_addr	= eth_validate_addr,
   3099	.ndo_set_mac_address	= eth_mac_addr,
   3100	.ndo_fdb_add		= vxlan_fdb_add,
   3101	.ndo_fdb_del		= vxlan_fdb_delete,
   3102	.ndo_fdb_dump		= vxlan_fdb_dump,
   3103	.ndo_fdb_get		= vxlan_fdb_get,
   3104	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
   3105};
   3106
   3107static const struct net_device_ops vxlan_netdev_raw_ops = {
   3108	.ndo_init		= vxlan_init,
   3109	.ndo_uninit		= vxlan_uninit,
   3110	.ndo_open		= vxlan_open,
   3111	.ndo_stop		= vxlan_stop,
   3112	.ndo_start_xmit		= vxlan_xmit,
   3113	.ndo_get_stats64	= dev_get_tstats64,
   3114	.ndo_change_mtu		= vxlan_change_mtu,
   3115	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
   3116};
   3117
   3118/* Info for udev, that this is a virtual tunnel endpoint */
   3119static struct device_type vxlan_type = {
   3120	.name = "vxlan",
   3121};
   3122
   3123/* Calls the ndo_udp_tunnel_add of the caller in order to
   3124 * supply the listening VXLAN udp ports. Callers are expected
   3125 * to implement the ndo_udp_tunnel_add.
   3126 */
   3127static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
   3128{
   3129	struct vxlan_sock *vs;
   3130	struct net *net = dev_net(dev);
   3131	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   3132	unsigned int i;
   3133
   3134	spin_lock(&vn->sock_lock);
   3135	for (i = 0; i < PORT_HASH_SIZE; ++i) {
   3136		hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
   3137			unsigned short type;
   3138
   3139			if (vs->flags & VXLAN_F_GPE)
   3140				type = UDP_TUNNEL_TYPE_VXLAN_GPE;
   3141			else
   3142				type = UDP_TUNNEL_TYPE_VXLAN;
   3143
   3144			if (push)
   3145				udp_tunnel_push_rx_port(dev, vs->sock, type);
   3146			else
   3147				udp_tunnel_drop_rx_port(dev, vs->sock, type);
   3148		}
   3149	}
   3150	spin_unlock(&vn->sock_lock);
   3151}
   3152
   3153/* Initialize the device structure. */
   3154static void vxlan_setup(struct net_device *dev)
   3155{
   3156	struct vxlan_dev *vxlan = netdev_priv(dev);
   3157	unsigned int h;
   3158
   3159	eth_hw_addr_random(dev);
   3160	ether_setup(dev);
   3161
   3162	dev->needs_free_netdev = true;
   3163	SET_NETDEV_DEVTYPE(dev, &vxlan_type);
   3164
   3165	dev->features	|= NETIF_F_LLTX;
   3166	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
   3167	dev->features   |= NETIF_F_RXCSUM;
   3168	dev->features   |= NETIF_F_GSO_SOFTWARE;
   3169
   3170	dev->vlan_features = dev->features;
   3171	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
   3172	dev->hw_features |= NETIF_F_RXCSUM;
   3173	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
   3174	netif_keep_dst(dev);
   3175	dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
   3176
   3177	/* MTU range: 68 - 65535 */
   3178	dev->min_mtu = ETH_MIN_MTU;
   3179	dev->max_mtu = ETH_MAX_MTU;
   3180
   3181	INIT_LIST_HEAD(&vxlan->next);
   3182
   3183	timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
   3184
   3185	vxlan->dev = dev;
   3186
   3187	for (h = 0; h < FDB_HASH_SIZE; ++h) {
   3188		spin_lock_init(&vxlan->hash_lock[h]);
   3189		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
   3190	}
   3191}
   3192
   3193static void vxlan_ether_setup(struct net_device *dev)
   3194{
   3195	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
   3196	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
   3197	dev->netdev_ops = &vxlan_netdev_ether_ops;
   3198}
   3199
   3200static void vxlan_raw_setup(struct net_device *dev)
   3201{
   3202	dev->header_ops = NULL;
   3203	dev->type = ARPHRD_NONE;
   3204	dev->hard_header_len = 0;
   3205	dev->addr_len = 0;
   3206	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
   3207	dev->netdev_ops = &vxlan_netdev_raw_ops;
   3208}
   3209
   3210static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
   3211	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
   3212	[IFLA_VXLAN_GROUP]	= { .len = sizeof_field(struct iphdr, daddr) },
   3213	[IFLA_VXLAN_GROUP6]	= { .len = sizeof(struct in6_addr) },
   3214	[IFLA_VXLAN_LINK]	= { .type = NLA_U32 },
   3215	[IFLA_VXLAN_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
   3216	[IFLA_VXLAN_LOCAL6]	= { .len = sizeof(struct in6_addr) },
   3217	[IFLA_VXLAN_TOS]	= { .type = NLA_U8 },
   3218	[IFLA_VXLAN_TTL]	= { .type = NLA_U8 },
   3219	[IFLA_VXLAN_LABEL]	= { .type = NLA_U32 },
   3220	[IFLA_VXLAN_LEARNING]	= { .type = NLA_U8 },
   3221	[IFLA_VXLAN_AGEING]	= { .type = NLA_U32 },
   3222	[IFLA_VXLAN_LIMIT]	= { .type = NLA_U32 },
   3223	[IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
   3224	[IFLA_VXLAN_PROXY]	= { .type = NLA_U8 },
   3225	[IFLA_VXLAN_RSC]	= { .type = NLA_U8 },
   3226	[IFLA_VXLAN_L2MISS]	= { .type = NLA_U8 },
   3227	[IFLA_VXLAN_L3MISS]	= { .type = NLA_U8 },
   3228	[IFLA_VXLAN_COLLECT_METADATA]	= { .type = NLA_U8 },
   3229	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
   3230	[IFLA_VXLAN_UDP_CSUM]	= { .type = NLA_U8 },
   3231	[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
   3232	[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
   3233	[IFLA_VXLAN_REMCSUM_TX]	= { .type = NLA_U8 },
   3234	[IFLA_VXLAN_REMCSUM_RX]	= { .type = NLA_U8 },
   3235	[IFLA_VXLAN_GBP]	= { .type = NLA_FLAG, },
   3236	[IFLA_VXLAN_GPE]	= { .type = NLA_FLAG, },
   3237	[IFLA_VXLAN_REMCSUM_NOPARTIAL]	= { .type = NLA_FLAG },
   3238	[IFLA_VXLAN_TTL_INHERIT]	= { .type = NLA_FLAG },
   3239	[IFLA_VXLAN_DF]		= { .type = NLA_U8 },
   3240	[IFLA_VXLAN_VNIFILTER]	= { .type = NLA_U8 },
   3241};
   3242
   3243static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
   3244			  struct netlink_ext_ack *extack)
   3245{
   3246	if (tb[IFLA_ADDRESS]) {
   3247		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
   3248			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
   3249					    "Provided link layer address is not Ethernet");
   3250			return -EINVAL;
   3251		}
   3252
   3253		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
   3254			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
   3255					    "Provided Ethernet address is not unicast");
   3256			return -EADDRNOTAVAIL;
   3257		}
   3258	}
   3259
   3260	if (tb[IFLA_MTU]) {
   3261		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
   3262
   3263		if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
   3264			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
   3265					    "MTU must be between 68 and 65535");
   3266			return -EINVAL;
   3267		}
   3268	}
   3269
   3270	if (!data) {
   3271		NL_SET_ERR_MSG(extack,
   3272			       "Required attributes not provided to perform the operation");
   3273		return -EINVAL;
   3274	}
   3275
   3276	if (data[IFLA_VXLAN_ID]) {
   3277		u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
   3278
   3279		if (id >= VXLAN_N_VID) {
   3280			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
   3281					    "VXLAN ID must be lower than 16777216");
   3282			return -ERANGE;
   3283		}
   3284	}
   3285
   3286	if (data[IFLA_VXLAN_PORT_RANGE]) {
   3287		const struct ifla_vxlan_port_range *p
   3288			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
   3289
   3290		if (ntohs(p->high) < ntohs(p->low)) {
   3291			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
   3292					    "Invalid source port range");
   3293			return -EINVAL;
   3294		}
   3295	}
   3296
   3297	if (data[IFLA_VXLAN_DF]) {
   3298		enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
   3299
   3300		if (df < 0 || df > VXLAN_DF_MAX) {
   3301			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
   3302					    "Invalid DF attribute");
   3303			return -EINVAL;
   3304		}
   3305	}
   3306
   3307	return 0;
   3308}
   3309
   3310static void vxlan_get_drvinfo(struct net_device *netdev,
   3311			      struct ethtool_drvinfo *drvinfo)
   3312{
   3313	strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
   3314	strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
   3315}
   3316
   3317static int vxlan_get_link_ksettings(struct net_device *dev,
   3318				    struct ethtool_link_ksettings *cmd)
   3319{
   3320	struct vxlan_dev *vxlan = netdev_priv(dev);
   3321	struct vxlan_rdst *dst = &vxlan->default_dst;
   3322	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
   3323							 dst->remote_ifindex);
   3324
   3325	if (!lowerdev) {
   3326		cmd->base.duplex = DUPLEX_UNKNOWN;
   3327		cmd->base.port = PORT_OTHER;
   3328		cmd->base.speed = SPEED_UNKNOWN;
   3329
   3330		return 0;
   3331	}
   3332
   3333	return __ethtool_get_link_ksettings(lowerdev, cmd);
   3334}
   3335
   3336static const struct ethtool_ops vxlan_ethtool_ops = {
   3337	.get_drvinfo		= vxlan_get_drvinfo,
   3338	.get_link		= ethtool_op_get_link,
   3339	.get_link_ksettings	= vxlan_get_link_ksettings,
   3340};
   3341
   3342static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
   3343					__be16 port, u32 flags, int ifindex)
   3344{
   3345	struct socket *sock;
   3346	struct udp_port_cfg udp_conf;
   3347	int err;
   3348
   3349	memset(&udp_conf, 0, sizeof(udp_conf));
   3350
   3351	if (ipv6) {
   3352		udp_conf.family = AF_INET6;
   3353		udp_conf.use_udp6_rx_checksums =
   3354		    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
   3355		udp_conf.ipv6_v6only = 1;
   3356	} else {
   3357		udp_conf.family = AF_INET;
   3358	}
   3359
   3360	udp_conf.local_udp_port = port;
   3361	udp_conf.bind_ifindex = ifindex;
   3362
   3363	/* Open UDP socket */
   3364	err = udp_sock_create(net, &udp_conf, &sock);
   3365	if (err < 0)
   3366		return ERR_PTR(err);
   3367
   3368	udp_allow_gso(sock->sk);
   3369	return sock;
   3370}
   3371
   3372/* Create new listen socket if needed */
   3373static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
   3374					      __be16 port, u32 flags,
   3375					      int ifindex)
   3376{
   3377	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   3378	struct vxlan_sock *vs;
   3379	struct socket *sock;
   3380	unsigned int h;
   3381	struct udp_tunnel_sock_cfg tunnel_cfg;
   3382
   3383	vs = kzalloc(sizeof(*vs), GFP_KERNEL);
   3384	if (!vs)
   3385		return ERR_PTR(-ENOMEM);
   3386
   3387	for (h = 0; h < VNI_HASH_SIZE; ++h)
   3388		INIT_HLIST_HEAD(&vs->vni_list[h]);
   3389
   3390	sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
   3391	if (IS_ERR(sock)) {
   3392		kfree(vs);
   3393		return ERR_CAST(sock);
   3394	}
   3395
   3396	vs->sock = sock;
   3397	refcount_set(&vs->refcnt, 1);
   3398	vs->flags = (flags & VXLAN_F_RCV_FLAGS);
   3399
   3400	spin_lock(&vn->sock_lock);
   3401	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
   3402	udp_tunnel_notify_add_rx_port(sock,
   3403				      (vs->flags & VXLAN_F_GPE) ?
   3404				      UDP_TUNNEL_TYPE_VXLAN_GPE :
   3405				      UDP_TUNNEL_TYPE_VXLAN);
   3406	spin_unlock(&vn->sock_lock);
   3407
   3408	/* Mark socket as an encapsulation socket. */
   3409	memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
   3410	tunnel_cfg.sk_user_data = vs;
   3411	tunnel_cfg.encap_type = 1;
   3412	tunnel_cfg.encap_rcv = vxlan_rcv;
   3413	tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
   3414	tunnel_cfg.encap_destroy = NULL;
   3415	tunnel_cfg.gro_receive = vxlan_gro_receive;
   3416	tunnel_cfg.gro_complete = vxlan_gro_complete;
   3417
   3418	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
   3419
   3420	return vs;
   3421}
   3422
   3423static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
   3424{
   3425	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
   3426	bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
   3427	struct vxlan_sock *vs = NULL;
   3428	struct vxlan_dev_node *node;
   3429	int l3mdev_index = 0;
   3430
   3431	if (vxlan->cfg.remote_ifindex)
   3432		l3mdev_index = l3mdev_master_upper_ifindex_by_index(
   3433			vxlan->net, vxlan->cfg.remote_ifindex);
   3434
   3435	if (!vxlan->cfg.no_share) {
   3436		spin_lock(&vn->sock_lock);
   3437		vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
   3438				     vxlan->cfg.dst_port, vxlan->cfg.flags,
   3439				     l3mdev_index);
   3440		if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
   3441			spin_unlock(&vn->sock_lock);
   3442			return -EBUSY;
   3443		}
   3444		spin_unlock(&vn->sock_lock);
   3445	}
   3446	if (!vs)
   3447		vs = vxlan_socket_create(vxlan->net, ipv6,
   3448					 vxlan->cfg.dst_port, vxlan->cfg.flags,
   3449					 l3mdev_index);
   3450	if (IS_ERR(vs))
   3451		return PTR_ERR(vs);
   3452#if IS_ENABLED(CONFIG_IPV6)
   3453	if (ipv6) {
   3454		rcu_assign_pointer(vxlan->vn6_sock, vs);
   3455		node = &vxlan->hlist6;
   3456	} else
   3457#endif
   3458	{
   3459		rcu_assign_pointer(vxlan->vn4_sock, vs);
   3460		node = &vxlan->hlist4;
   3461	}
   3462
   3463	if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER))
   3464		vxlan_vs_add_vnigrp(vxlan, vs, ipv6);
   3465	else
   3466		vxlan_vs_add_dev(vs, vxlan, node);
   3467
   3468	return 0;
   3469}
   3470
   3471static int vxlan_sock_add(struct vxlan_dev *vxlan)
   3472{
   3473	bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
   3474	bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
   3475	bool ipv4 = !ipv6 || metadata;
   3476	int ret = 0;
   3477
   3478	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
   3479#if IS_ENABLED(CONFIG_IPV6)
   3480	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
   3481	if (ipv6) {
   3482		ret = __vxlan_sock_add(vxlan, true);
   3483		if (ret < 0 && ret != -EAFNOSUPPORT)
   3484			ipv4 = false;
   3485	}
   3486#endif
   3487	if (ipv4)
   3488		ret = __vxlan_sock_add(vxlan, false);
   3489	if (ret < 0)
   3490		vxlan_sock_release(vxlan);
   3491	return ret;
   3492}
   3493
   3494int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
   3495		     struct vxlan_config *conf, __be32 vni)
   3496{
   3497	struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
   3498	struct vxlan_dev *tmp;
   3499
   3500	list_for_each_entry(tmp, &vn->vxlan_list, next) {
   3501		if (tmp == vxlan)
   3502			continue;
   3503		if (tmp->cfg.flags & VXLAN_F_VNIFILTER) {
   3504			if (!vxlan_vnifilter_lookup(tmp, vni))
   3505				continue;
   3506		} else if (tmp->cfg.vni != vni) {
   3507			continue;
   3508		}
   3509		if (tmp->cfg.dst_port != conf->dst_port)
   3510			continue;
   3511		if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
   3512		    (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
   3513			continue;
   3514
   3515		if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
   3516		    tmp->cfg.remote_ifindex != conf->remote_ifindex)
   3517			continue;
   3518
   3519		return -EEXIST;
   3520	}
   3521
   3522	return 0;
   3523}
   3524
   3525static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
   3526				 struct net_device **lower,
   3527				 struct vxlan_dev *old,
   3528				 struct netlink_ext_ack *extack)
   3529{
   3530	bool use_ipv6 = false;
   3531
   3532	if (conf->flags & VXLAN_F_GPE) {
   3533		/* For now, allow GPE only together with
   3534		 * COLLECT_METADATA. This can be relaxed later; in such
   3535		 * case, the other side of the PtP link will have to be
   3536		 * provided.
   3537		 */
   3538		if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
   3539		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
   3540			NL_SET_ERR_MSG(extack,
   3541				       "VXLAN GPE does not support this combination of attributes");
   3542			return -EINVAL;
   3543		}
   3544	}
   3545
   3546	if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
   3547		/* Unless IPv6 is explicitly requested, assume IPv4 */
   3548		conf->remote_ip.sa.sa_family = AF_INET;
   3549		conf->saddr.sa.sa_family = AF_INET;
   3550	} else if (!conf->remote_ip.sa.sa_family) {
   3551		conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
   3552	} else if (!conf->saddr.sa.sa_family) {
   3553		conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
   3554	}
   3555
   3556	if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
   3557		NL_SET_ERR_MSG(extack,
   3558			       "Local and remote address must be from the same family");
   3559		return -EINVAL;
   3560	}
   3561
   3562	if (vxlan_addr_multicast(&conf->saddr)) {
   3563		NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
   3564		return -EINVAL;
   3565	}
   3566
   3567	if (conf->saddr.sa.sa_family == AF_INET6) {
   3568		if (!IS_ENABLED(CONFIG_IPV6)) {
   3569			NL_SET_ERR_MSG(extack,
   3570				       "IPv6 support not enabled in the kernel");
   3571			return -EPFNOSUPPORT;
   3572		}
   3573		use_ipv6 = true;
   3574		conf->flags |= VXLAN_F_IPV6;
   3575
   3576		if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
   3577			int local_type =
   3578				ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
   3579			int remote_type =
   3580				ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
   3581
   3582			if (local_type & IPV6_ADDR_LINKLOCAL) {
   3583				if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
   3584				    (remote_type != IPV6_ADDR_ANY)) {
   3585					NL_SET_ERR_MSG(extack,
   3586						       "Invalid combination of local and remote address scopes");
   3587					return -EINVAL;
   3588				}
   3589
   3590				conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
   3591			} else {
   3592				if (remote_type ==
   3593				    (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
   3594					NL_SET_ERR_MSG(extack,
   3595						       "Invalid combination of local and remote address scopes");
   3596					return -EINVAL;
   3597				}
   3598
   3599				conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
   3600			}
   3601		}
   3602	}
   3603
   3604	if (conf->label && !use_ipv6) {
   3605		NL_SET_ERR_MSG(extack,
   3606			       "Label attribute only applies to IPv6 VXLAN devices");
   3607		return -EINVAL;
   3608	}
   3609
   3610	if (conf->remote_ifindex) {
   3611		struct net_device *lowerdev;
   3612
   3613		lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
   3614		if (!lowerdev) {
   3615			NL_SET_ERR_MSG(extack,
   3616				       "Invalid local interface, device not found");
   3617			return -ENODEV;
   3618		}
   3619
   3620#if IS_ENABLED(CONFIG_IPV6)
   3621		if (use_ipv6) {
   3622			struct inet6_dev *idev = __in6_dev_get(lowerdev);
   3623
   3624			if (idev && idev->cnf.disable_ipv6) {
   3625				NL_SET_ERR_MSG(extack,
   3626					       "IPv6 support disabled by administrator");
   3627				return -EPERM;
   3628			}
   3629		}
   3630#endif
   3631
   3632		*lower = lowerdev;
   3633	} else {
   3634		if (vxlan_addr_multicast(&conf->remote_ip)) {
   3635			NL_SET_ERR_MSG(extack,
   3636				       "Local interface required for multicast remote destination");
   3637
   3638			return -EINVAL;
   3639		}
   3640
   3641#if IS_ENABLED(CONFIG_IPV6)
   3642		if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
   3643			NL_SET_ERR_MSG(extack,
   3644				       "Local interface required for link-local local/remote addresses");
   3645			return -EINVAL;
   3646		}
   3647#endif
   3648
   3649		*lower = NULL;
   3650	}
   3651
   3652	if (!conf->dst_port) {
   3653		if (conf->flags & VXLAN_F_GPE)
   3654			conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
   3655		else
   3656			conf->dst_port = htons(vxlan_port);
   3657	}
   3658
   3659	if (!conf->age_interval)
   3660		conf->age_interval = FDB_AGE_DEFAULT;
   3661
   3662	if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) {
   3663		NL_SET_ERR_MSG(extack,
   3664			       "A VXLAN device with the specified VNI already exists");
   3665		return -EEXIST;
   3666	}
   3667
   3668	return 0;
   3669}
   3670
   3671static void vxlan_config_apply(struct net_device *dev,
   3672			       struct vxlan_config *conf,
   3673			       struct net_device *lowerdev,
   3674			       struct net *src_net,
   3675			       bool changelink)
   3676{
   3677	struct vxlan_dev *vxlan = netdev_priv(dev);
   3678	struct vxlan_rdst *dst = &vxlan->default_dst;
   3679	unsigned short needed_headroom = ETH_HLEN;
   3680	bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
   3681	int max_mtu = ETH_MAX_MTU;
   3682
   3683	if (!changelink) {
   3684		if (conf->flags & VXLAN_F_GPE)
   3685			vxlan_raw_setup(dev);
   3686		else
   3687			vxlan_ether_setup(dev);
   3688
   3689		if (conf->mtu)
   3690			dev->mtu = conf->mtu;
   3691
   3692		vxlan->net = src_net;
   3693	}
   3694
   3695	dst->remote_vni = conf->vni;
   3696
   3697	memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
   3698
   3699	if (lowerdev) {
   3700		dst->remote_ifindex = conf->remote_ifindex;
   3701
   3702		netif_inherit_tso_max(dev, lowerdev);
   3703
   3704		needed_headroom = lowerdev->hard_header_len;
   3705		needed_headroom += lowerdev->needed_headroom;
   3706
   3707		dev->needed_tailroom = lowerdev->needed_tailroom;
   3708
   3709		max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
   3710					   VXLAN_HEADROOM);
   3711		if (max_mtu < ETH_MIN_MTU)
   3712			max_mtu = ETH_MIN_MTU;
   3713
   3714		if (!changelink && !conf->mtu)
   3715			dev->mtu = max_mtu;
   3716	}
   3717
   3718	if (dev->mtu > max_mtu)
   3719		dev->mtu = max_mtu;
   3720
   3721	if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
   3722		needed_headroom += VXLAN6_HEADROOM;
   3723	else
   3724		needed_headroom += VXLAN_HEADROOM;
   3725	dev->needed_headroom = needed_headroom;
   3726
   3727	memcpy(&vxlan->cfg, conf, sizeof(*conf));
   3728}
   3729
   3730static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
   3731			       struct vxlan_config *conf, bool changelink,
   3732			       struct netlink_ext_ack *extack)
   3733{
   3734	struct vxlan_dev *vxlan = netdev_priv(dev);
   3735	struct net_device *lowerdev;
   3736	int ret;
   3737
   3738	ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
   3739	if (ret)
   3740		return ret;
   3741
   3742	vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
   3743
   3744	return 0;
   3745}
   3746
   3747static int __vxlan_dev_create(struct net *net, struct net_device *dev,
   3748			      struct vxlan_config *conf,
   3749			      struct netlink_ext_ack *extack)
   3750{
   3751	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   3752	struct vxlan_dev *vxlan = netdev_priv(dev);
   3753	struct net_device *remote_dev = NULL;
   3754	struct vxlan_fdb *f = NULL;
   3755	bool unregister = false;
   3756	struct vxlan_rdst *dst;
   3757	int err;
   3758
   3759	dst = &vxlan->default_dst;
   3760	err = vxlan_dev_configure(net, dev, conf, false, extack);
   3761	if (err)
   3762		return err;
   3763
   3764	dev->ethtool_ops = &vxlan_ethtool_ops;
   3765
   3766	/* create an fdb entry for a valid default destination */
   3767	if (!vxlan_addr_any(&dst->remote_ip)) {
   3768		err = vxlan_fdb_create(vxlan, all_zeros_mac,
   3769				       &dst->remote_ip,
   3770				       NUD_REACHABLE | NUD_PERMANENT,
   3771				       vxlan->cfg.dst_port,
   3772				       dst->remote_vni,
   3773				       dst->remote_vni,
   3774				       dst->remote_ifindex,
   3775				       NTF_SELF, 0, &f, extack);
   3776		if (err)
   3777			return err;
   3778	}
   3779
   3780	err = register_netdevice(dev);
   3781	if (err)
   3782		goto errout;
   3783	unregister = true;
   3784
   3785	if (dst->remote_ifindex) {
   3786		remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
   3787		if (!remote_dev) {
   3788			err = -ENODEV;
   3789			goto errout;
   3790		}
   3791
   3792		err = netdev_upper_dev_link(remote_dev, dev, extack);
   3793		if (err)
   3794			goto errout;
   3795	}
   3796
   3797	err = rtnl_configure_link(dev, NULL);
   3798	if (err < 0)
   3799		goto unlink;
   3800
   3801	if (f) {
   3802		vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
   3803
   3804		/* notify default fdb entry */
   3805		err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
   3806				       RTM_NEWNEIGH, true, extack);
   3807		if (err) {
   3808			vxlan_fdb_destroy(vxlan, f, false, false);
   3809			if (remote_dev)
   3810				netdev_upper_dev_unlink(remote_dev, dev);
   3811			goto unregister;
   3812		}
   3813	}
   3814
   3815	list_add(&vxlan->next, &vn->vxlan_list);
   3816	if (remote_dev)
   3817		dst->remote_dev = remote_dev;
   3818	return 0;
   3819unlink:
   3820	if (remote_dev)
   3821		netdev_upper_dev_unlink(remote_dev, dev);
   3822errout:
   3823	/* unregister_netdevice() destroys the default FDB entry with deletion
   3824	 * notification. But the addition notification was not sent yet, so
   3825	 * destroy the entry by hand here.
   3826	 */
   3827	if (f)
   3828		__vxlan_fdb_free(f);
   3829unregister:
   3830	if (unregister)
   3831		unregister_netdevice(dev);
   3832	return err;
   3833}
   3834
   3835/* Set/clear flags based on attribute */
   3836static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
   3837			  int attrtype, unsigned long mask, bool changelink,
   3838			  bool changelink_supported,
   3839			  struct netlink_ext_ack *extack)
   3840{
   3841	unsigned long flags;
   3842
   3843	if (!tb[attrtype])
   3844		return 0;
   3845
   3846	if (changelink && !changelink_supported) {
   3847		vxlan_flag_attr_error(attrtype, extack);
   3848		return -EOPNOTSUPP;
   3849	}
   3850
   3851	if (vxlan_policy[attrtype].type == NLA_FLAG)
   3852		flags = conf->flags | mask;
   3853	else if (nla_get_u8(tb[attrtype]))
   3854		flags = conf->flags | mask;
   3855	else
   3856		flags = conf->flags & ~mask;
   3857
   3858	conf->flags = flags;
   3859
   3860	return 0;
   3861}
   3862
   3863static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
   3864			 struct net_device *dev, struct vxlan_config *conf,
   3865			 bool changelink, struct netlink_ext_ack *extack)
   3866{
   3867	struct vxlan_dev *vxlan = netdev_priv(dev);
   3868	int err = 0;
   3869
   3870	memset(conf, 0, sizeof(*conf));
   3871
   3872	/* if changelink operation, start with old existing cfg */
   3873	if (changelink)
   3874		memcpy(conf, &vxlan->cfg, sizeof(*conf));
   3875
   3876	if (data[IFLA_VXLAN_ID]) {
   3877		__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
   3878
   3879		if (changelink && (vni != conf->vni)) {
   3880			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
   3881			return -EOPNOTSUPP;
   3882		}
   3883		conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
   3884	}
   3885
   3886	if (data[IFLA_VXLAN_GROUP]) {
   3887		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
   3888			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
   3889			return -EOPNOTSUPP;
   3890		}
   3891
   3892		conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
   3893		conf->remote_ip.sa.sa_family = AF_INET;
   3894	} else if (data[IFLA_VXLAN_GROUP6]) {
   3895		if (!IS_ENABLED(CONFIG_IPV6)) {
   3896			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
   3897			return -EPFNOSUPPORT;
   3898		}
   3899
   3900		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
   3901			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
   3902			return -EOPNOTSUPP;
   3903		}
   3904
   3905		conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
   3906		conf->remote_ip.sa.sa_family = AF_INET6;
   3907	}
   3908
   3909	if (data[IFLA_VXLAN_LOCAL]) {
   3910		if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
   3911			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
   3912			return -EOPNOTSUPP;
   3913		}
   3914
   3915		conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
   3916		conf->saddr.sa.sa_family = AF_INET;
   3917	} else if (data[IFLA_VXLAN_LOCAL6]) {
   3918		if (!IS_ENABLED(CONFIG_IPV6)) {
   3919			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
   3920			return -EPFNOSUPPORT;
   3921		}
   3922
   3923		if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
   3924			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
   3925			return -EOPNOTSUPP;
   3926		}
   3927
   3928		/* TODO: respect scope id */
   3929		conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
   3930		conf->saddr.sa.sa_family = AF_INET6;
   3931	}
   3932
   3933	if (data[IFLA_VXLAN_LINK])
   3934		conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
   3935
   3936	if (data[IFLA_VXLAN_TOS])
   3937		conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
   3938
   3939	if (data[IFLA_VXLAN_TTL])
   3940		conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
   3941
   3942	if (data[IFLA_VXLAN_TTL_INHERIT]) {
   3943		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
   3944				    VXLAN_F_TTL_INHERIT, changelink, false,
   3945				    extack);
   3946		if (err)
   3947			return err;
   3948
   3949	}
   3950
   3951	if (data[IFLA_VXLAN_LABEL])
   3952		conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
   3953			     IPV6_FLOWLABEL_MASK;
   3954
   3955	if (data[IFLA_VXLAN_LEARNING]) {
   3956		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
   3957				    VXLAN_F_LEARN, changelink, true,
   3958				    extack);
   3959		if (err)
   3960			return err;
   3961	} else if (!changelink) {
   3962		/* default to learn on a new device */
   3963		conf->flags |= VXLAN_F_LEARN;
   3964	}
   3965
   3966	if (data[IFLA_VXLAN_AGEING])
   3967		conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
   3968
   3969	if (data[IFLA_VXLAN_PROXY]) {
   3970		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
   3971				    VXLAN_F_PROXY, changelink, false,
   3972				    extack);
   3973		if (err)
   3974			return err;
   3975	}
   3976
   3977	if (data[IFLA_VXLAN_RSC]) {
   3978		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
   3979				    VXLAN_F_RSC, changelink, false,
   3980				    extack);
   3981		if (err)
   3982			return err;
   3983	}
   3984
   3985	if (data[IFLA_VXLAN_L2MISS]) {
   3986		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
   3987				    VXLAN_F_L2MISS, changelink, false,
   3988				    extack);
   3989		if (err)
   3990			return err;
   3991	}
   3992
   3993	if (data[IFLA_VXLAN_L3MISS]) {
   3994		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
   3995				    VXLAN_F_L3MISS, changelink, false,
   3996				    extack);
   3997		if (err)
   3998			return err;
   3999	}
   4000
   4001	if (data[IFLA_VXLAN_LIMIT]) {
   4002		if (changelink) {
   4003			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
   4004					    "Cannot change limit");
   4005			return -EOPNOTSUPP;
   4006		}
   4007		conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
   4008	}
   4009
   4010	if (data[IFLA_VXLAN_COLLECT_METADATA]) {
   4011		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
   4012				    VXLAN_F_COLLECT_METADATA, changelink, false,
   4013				    extack);
   4014		if (err)
   4015			return err;
   4016	}
   4017
   4018	if (data[IFLA_VXLAN_PORT_RANGE]) {
   4019		if (!changelink) {
   4020			const struct ifla_vxlan_port_range *p
   4021				= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
   4022			conf->port_min = ntohs(p->low);
   4023			conf->port_max = ntohs(p->high);
   4024		} else {
   4025			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
   4026					    "Cannot change port range");
   4027			return -EOPNOTSUPP;
   4028		}
   4029	}
   4030
   4031	if (data[IFLA_VXLAN_PORT]) {
   4032		if (changelink) {
   4033			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
   4034					    "Cannot change port");
   4035			return -EOPNOTSUPP;
   4036		}
   4037		conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
   4038	}
   4039
   4040	if (data[IFLA_VXLAN_UDP_CSUM]) {
   4041		if (changelink) {
   4042			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
   4043					    "Cannot change UDP_CSUM flag");
   4044			return -EOPNOTSUPP;
   4045		}
   4046		if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
   4047			conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
   4048	}
   4049
   4050	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
   4051		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
   4052				    VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
   4053				    false, extack);
   4054		if (err)
   4055			return err;
   4056	}
   4057
   4058	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
   4059		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
   4060				    VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
   4061				    false, extack);
   4062		if (err)
   4063			return err;
   4064	}
   4065
   4066	if (data[IFLA_VXLAN_REMCSUM_TX]) {
   4067		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
   4068				    VXLAN_F_REMCSUM_TX, changelink, false,
   4069				    extack);
   4070		if (err)
   4071			return err;
   4072	}
   4073
   4074	if (data[IFLA_VXLAN_REMCSUM_RX]) {
   4075		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
   4076				    VXLAN_F_REMCSUM_RX, changelink, false,
   4077				    extack);
   4078		if (err)
   4079			return err;
   4080	}
   4081
   4082	if (data[IFLA_VXLAN_GBP]) {
   4083		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
   4084				    VXLAN_F_GBP, changelink, false, extack);
   4085		if (err)
   4086			return err;
   4087	}
   4088
   4089	if (data[IFLA_VXLAN_GPE]) {
   4090		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
   4091				    VXLAN_F_GPE, changelink, false,
   4092				    extack);
   4093		if (err)
   4094			return err;
   4095	}
   4096
   4097	if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
   4098		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
   4099				    VXLAN_F_REMCSUM_NOPARTIAL, changelink,
   4100				    false, extack);
   4101		if (err)
   4102			return err;
   4103	}
   4104
   4105	if (tb[IFLA_MTU]) {
   4106		if (changelink) {
   4107			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
   4108					    "Cannot change mtu");
   4109			return -EOPNOTSUPP;
   4110		}
   4111		conf->mtu = nla_get_u32(tb[IFLA_MTU]);
   4112	}
   4113
   4114	if (data[IFLA_VXLAN_DF])
   4115		conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
   4116
   4117	if (data[IFLA_VXLAN_VNIFILTER]) {
   4118		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER,
   4119				    VXLAN_F_VNIFILTER, changelink, false,
   4120				    extack);
   4121		if (err)
   4122			return err;
   4123
   4124		if ((conf->flags & VXLAN_F_VNIFILTER) &&
   4125		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
   4126			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER],
   4127					    "vxlan vnifilter only valid in collect metadata mode");
   4128			return -EINVAL;
   4129		}
   4130	}
   4131
   4132	return 0;
   4133}
   4134
   4135static int vxlan_newlink(struct net *src_net, struct net_device *dev,
   4136			 struct nlattr *tb[], struct nlattr *data[],
   4137			 struct netlink_ext_ack *extack)
   4138{
   4139	struct vxlan_config conf;
   4140	int err;
   4141
   4142	err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
   4143	if (err)
   4144		return err;
   4145
   4146	return __vxlan_dev_create(src_net, dev, &conf, extack);
   4147}
   4148
   4149static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
   4150			    struct nlattr *data[],
   4151			    struct netlink_ext_ack *extack)
   4152{
   4153	struct vxlan_dev *vxlan = netdev_priv(dev);
   4154	struct net_device *lowerdev;
   4155	struct vxlan_config conf;
   4156	struct vxlan_rdst *dst;
   4157	int err;
   4158
   4159	dst = &vxlan->default_dst;
   4160	err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
   4161	if (err)
   4162		return err;
   4163
   4164	err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
   4165				    vxlan, extack);
   4166	if (err)
   4167		return err;
   4168
   4169	if (dst->remote_dev == lowerdev)
   4170		lowerdev = NULL;
   4171
   4172	err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
   4173					     extack);
   4174	if (err)
   4175		return err;
   4176
   4177	/* handle default dst entry */
   4178	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
   4179		u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
   4180
   4181		spin_lock_bh(&vxlan->hash_lock[hash_index]);
   4182		if (!vxlan_addr_any(&conf.remote_ip)) {
   4183			err = vxlan_fdb_update(vxlan, all_zeros_mac,
   4184					       &conf.remote_ip,
   4185					       NUD_REACHABLE | NUD_PERMANENT,
   4186					       NLM_F_APPEND | NLM_F_CREATE,
   4187					       vxlan->cfg.dst_port,
   4188					       conf.vni, conf.vni,
   4189					       conf.remote_ifindex,
   4190					       NTF_SELF, 0, true, extack);
   4191			if (err) {
   4192				spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4193				netdev_adjacent_change_abort(dst->remote_dev,
   4194							     lowerdev, dev);
   4195				return err;
   4196			}
   4197		}
   4198		if (!vxlan_addr_any(&dst->remote_ip))
   4199			__vxlan_fdb_delete(vxlan, all_zeros_mac,
   4200					   dst->remote_ip,
   4201					   vxlan->cfg.dst_port,
   4202					   dst->remote_vni,
   4203					   dst->remote_vni,
   4204					   dst->remote_ifindex,
   4205					   true);
   4206		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4207
   4208		/* If vni filtering device, also update fdb entries of
   4209		 * all vnis that were using default remote ip
   4210		 */
   4211		if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
   4212			err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip,
   4213							 &conf.remote_ip, extack);
   4214			if (err) {
   4215				netdev_adjacent_change_abort(dst->remote_dev,
   4216							     lowerdev, dev);
   4217				return err;
   4218			}
   4219		}
   4220	}
   4221
   4222	if (conf.age_interval != vxlan->cfg.age_interval)
   4223		mod_timer(&vxlan->age_timer, jiffies);
   4224
   4225	netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
   4226	if (lowerdev && lowerdev != dst->remote_dev)
   4227		dst->remote_dev = lowerdev;
   4228	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
   4229	return 0;
   4230}
   4231
   4232static void vxlan_dellink(struct net_device *dev, struct list_head *head)
   4233{
   4234	struct vxlan_dev *vxlan = netdev_priv(dev);
   4235
   4236	vxlan_flush(vxlan, true);
   4237
   4238	list_del(&vxlan->next);
   4239	unregister_netdevice_queue(dev, head);
   4240	if (vxlan->default_dst.remote_dev)
   4241		netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
   4242}
   4243
   4244static size_t vxlan_get_size(const struct net_device *dev)
   4245{
   4246
   4247	return nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_ID */
   4248		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
   4249		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LINK */
   4250		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
   4251		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL */
   4252		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL_INHERIT */
   4253		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
   4254		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_DF */
   4255		nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
   4256		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_LEARNING */
   4257		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_PROXY */
   4258		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_RSC */
   4259		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L2MISS */
   4260		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L3MISS */
   4261		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_COLLECT_METADATA */
   4262		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_AGEING */
   4263		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LIMIT */
   4264		nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
   4265		nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
   4266		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
   4267		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
   4268		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
   4269		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
   4270		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
   4271		0;
   4272}
   4273
   4274static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
   4275{
   4276	const struct vxlan_dev *vxlan = netdev_priv(dev);
   4277	const struct vxlan_rdst *dst = &vxlan->default_dst;
   4278	struct ifla_vxlan_port_range ports = {
   4279		.low =  htons(vxlan->cfg.port_min),
   4280		.high = htons(vxlan->cfg.port_max),
   4281	};
   4282
   4283	if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
   4284		goto nla_put_failure;
   4285
   4286	if (!vxlan_addr_any(&dst->remote_ip)) {
   4287		if (dst->remote_ip.sa.sa_family == AF_INET) {
   4288			if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
   4289					    dst->remote_ip.sin.sin_addr.s_addr))
   4290				goto nla_put_failure;
   4291#if IS_ENABLED(CONFIG_IPV6)
   4292		} else {
   4293			if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
   4294					     &dst->remote_ip.sin6.sin6_addr))
   4295				goto nla_put_failure;
   4296#endif
   4297		}
   4298	}
   4299
   4300	if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
   4301		goto nla_put_failure;
   4302
   4303	if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
   4304		if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
   4305			if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
   4306					    vxlan->cfg.saddr.sin.sin_addr.s_addr))
   4307				goto nla_put_failure;
   4308#if IS_ENABLED(CONFIG_IPV6)
   4309		} else {
   4310			if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
   4311					     &vxlan->cfg.saddr.sin6.sin6_addr))
   4312				goto nla_put_failure;
   4313#endif
   4314		}
   4315	}
   4316
   4317	if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
   4318	    nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
   4319		       !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
   4320	    nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
   4321	    nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
   4322	    nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
   4323	    nla_put_u8(skb, IFLA_VXLAN_LEARNING,
   4324		       !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
   4325	    nla_put_u8(skb, IFLA_VXLAN_PROXY,
   4326		       !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
   4327	    nla_put_u8(skb, IFLA_VXLAN_RSC,
   4328		       !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
   4329	    nla_put_u8(skb, IFLA_VXLAN_L2MISS,
   4330		       !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
   4331	    nla_put_u8(skb, IFLA_VXLAN_L3MISS,
   4332		       !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
   4333	    nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
   4334		       !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
   4335	    nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
   4336	    nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
   4337	    nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
   4338	    nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
   4339		       !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
   4340	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
   4341		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
   4342	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
   4343		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
   4344	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
   4345		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
   4346	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
   4347		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
   4348		goto nla_put_failure;
   4349
   4350	if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
   4351		goto nla_put_failure;
   4352
   4353	if (vxlan->cfg.flags & VXLAN_F_GBP &&
   4354	    nla_put_flag(skb, IFLA_VXLAN_GBP))
   4355		goto nla_put_failure;
   4356
   4357	if (vxlan->cfg.flags & VXLAN_F_GPE &&
   4358	    nla_put_flag(skb, IFLA_VXLAN_GPE))
   4359		goto nla_put_failure;
   4360
   4361	if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
   4362	    nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
   4363		goto nla_put_failure;
   4364
   4365	if (vxlan->cfg.flags & VXLAN_F_VNIFILTER &&
   4366	    nla_put_u8(skb, IFLA_VXLAN_VNIFILTER,
   4367		       !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER)))
   4368		goto nla_put_failure;
   4369
   4370	return 0;
   4371
   4372nla_put_failure:
   4373	return -EMSGSIZE;
   4374}
   4375
   4376static struct net *vxlan_get_link_net(const struct net_device *dev)
   4377{
   4378	struct vxlan_dev *vxlan = netdev_priv(dev);
   4379
   4380	return vxlan->net;
   4381}
   4382
   4383static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
   4384	.kind		= "vxlan",
   4385	.maxtype	= IFLA_VXLAN_MAX,
   4386	.policy		= vxlan_policy,
   4387	.priv_size	= sizeof(struct vxlan_dev),
   4388	.setup		= vxlan_setup,
   4389	.validate	= vxlan_validate,
   4390	.newlink	= vxlan_newlink,
   4391	.changelink	= vxlan_changelink,
   4392	.dellink	= vxlan_dellink,
   4393	.get_size	= vxlan_get_size,
   4394	.fill_info	= vxlan_fill_info,
   4395	.get_link_net	= vxlan_get_link_net,
   4396};
   4397
   4398struct net_device *vxlan_dev_create(struct net *net, const char *name,
   4399				    u8 name_assign_type,
   4400				    struct vxlan_config *conf)
   4401{
   4402	struct nlattr *tb[IFLA_MAX + 1];
   4403	struct net_device *dev;
   4404	int err;
   4405
   4406	memset(&tb, 0, sizeof(tb));
   4407
   4408	dev = rtnl_create_link(net, name, name_assign_type,
   4409			       &vxlan_link_ops, tb, NULL);
   4410	if (IS_ERR(dev))
   4411		return dev;
   4412
   4413	err = __vxlan_dev_create(net, dev, conf, NULL);
   4414	if (err < 0) {
   4415		free_netdev(dev);
   4416		return ERR_PTR(err);
   4417	}
   4418
   4419	err = rtnl_configure_link(dev, NULL);
   4420	if (err < 0) {
   4421		LIST_HEAD(list_kill);
   4422
   4423		vxlan_dellink(dev, &list_kill);
   4424		unregister_netdevice_many(&list_kill);
   4425		return ERR_PTR(err);
   4426	}
   4427
   4428	return dev;
   4429}
   4430EXPORT_SYMBOL_GPL(vxlan_dev_create);
   4431
   4432static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
   4433					     struct net_device *dev)
   4434{
   4435	struct vxlan_dev *vxlan, *next;
   4436	LIST_HEAD(list_kill);
   4437
   4438	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
   4439		struct vxlan_rdst *dst = &vxlan->default_dst;
   4440
   4441		/* In case we created vxlan device with carrier
   4442		 * and we loose the carrier due to module unload
   4443		 * we also need to remove vxlan device. In other
   4444		 * cases, it's not necessary and remote_ifindex
   4445		 * is 0 here, so no matches.
   4446		 */
   4447		if (dst->remote_ifindex == dev->ifindex)
   4448			vxlan_dellink(vxlan->dev, &list_kill);
   4449	}
   4450
   4451	unregister_netdevice_many(&list_kill);
   4452}
   4453
   4454static int vxlan_netdevice_event(struct notifier_block *unused,
   4455				 unsigned long event, void *ptr)
   4456{
   4457	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
   4458	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
   4459
   4460	if (event == NETDEV_UNREGISTER)
   4461		vxlan_handle_lowerdev_unregister(vn, dev);
   4462	else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
   4463		vxlan_offload_rx_ports(dev, true);
   4464	else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
   4465		vxlan_offload_rx_ports(dev, false);
   4466
   4467	return NOTIFY_DONE;
   4468}
   4469
   4470static struct notifier_block vxlan_notifier_block __read_mostly = {
   4471	.notifier_call = vxlan_netdevice_event,
   4472};
   4473
   4474static void
   4475vxlan_fdb_offloaded_set(struct net_device *dev,
   4476			struct switchdev_notifier_vxlan_fdb_info *fdb_info)
   4477{
   4478	struct vxlan_dev *vxlan = netdev_priv(dev);
   4479	struct vxlan_rdst *rdst;
   4480	struct vxlan_fdb *f;
   4481	u32 hash_index;
   4482
   4483	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
   4484
   4485	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   4486
   4487	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
   4488	if (!f)
   4489		goto out;
   4490
   4491	rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
   4492				   fdb_info->remote_port,
   4493				   fdb_info->remote_vni,
   4494				   fdb_info->remote_ifindex);
   4495	if (!rdst)
   4496		goto out;
   4497
   4498	rdst->offloaded = fdb_info->offloaded;
   4499
   4500out:
   4501	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4502}
   4503
   4504static int
   4505vxlan_fdb_external_learn_add(struct net_device *dev,
   4506			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
   4507{
   4508	struct vxlan_dev *vxlan = netdev_priv(dev);
   4509	struct netlink_ext_ack *extack;
   4510	u32 hash_index;
   4511	int err;
   4512
   4513	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
   4514	extack = switchdev_notifier_info_to_extack(&fdb_info->info);
   4515
   4516	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   4517	err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
   4518			       NUD_REACHABLE,
   4519			       NLM_F_CREATE | NLM_F_REPLACE,
   4520			       fdb_info->remote_port,
   4521			       fdb_info->vni,
   4522			       fdb_info->remote_vni,
   4523			       fdb_info->remote_ifindex,
   4524			       NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
   4525			       0, false, extack);
   4526	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4527
   4528	return err;
   4529}
   4530
   4531static int
   4532vxlan_fdb_external_learn_del(struct net_device *dev,
   4533			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
   4534{
   4535	struct vxlan_dev *vxlan = netdev_priv(dev);
   4536	struct vxlan_fdb *f;
   4537	u32 hash_index;
   4538	int err = 0;
   4539
   4540	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
   4541	spin_lock_bh(&vxlan->hash_lock[hash_index]);
   4542
   4543	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
   4544	if (!f)
   4545		err = -ENOENT;
   4546	else if (f->flags & NTF_EXT_LEARNED)
   4547		err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
   4548					 fdb_info->remote_ip,
   4549					 fdb_info->remote_port,
   4550					 fdb_info->vni,
   4551					 fdb_info->remote_vni,
   4552					 fdb_info->remote_ifindex,
   4553					 false);
   4554
   4555	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4556
   4557	return err;
   4558}
   4559
   4560static int vxlan_switchdev_event(struct notifier_block *unused,
   4561				 unsigned long event, void *ptr)
   4562{
   4563	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
   4564	struct switchdev_notifier_vxlan_fdb_info *fdb_info;
   4565	int err = 0;
   4566
   4567	switch (event) {
   4568	case SWITCHDEV_VXLAN_FDB_OFFLOADED:
   4569		vxlan_fdb_offloaded_set(dev, ptr);
   4570		break;
   4571	case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
   4572		fdb_info = ptr;
   4573		err = vxlan_fdb_external_learn_add(dev, fdb_info);
   4574		if (err) {
   4575			err = notifier_from_errno(err);
   4576			break;
   4577		}
   4578		fdb_info->offloaded = true;
   4579		vxlan_fdb_offloaded_set(dev, fdb_info);
   4580		break;
   4581	case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
   4582		fdb_info = ptr;
   4583		err = vxlan_fdb_external_learn_del(dev, fdb_info);
   4584		if (err) {
   4585			err = notifier_from_errno(err);
   4586			break;
   4587		}
   4588		fdb_info->offloaded = false;
   4589		vxlan_fdb_offloaded_set(dev, fdb_info);
   4590		break;
   4591	}
   4592
   4593	return err;
   4594}
   4595
   4596static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
   4597	.notifier_call = vxlan_switchdev_event,
   4598};
   4599
   4600static void vxlan_fdb_nh_flush(struct nexthop *nh)
   4601{
   4602	struct vxlan_fdb *fdb;
   4603	struct vxlan_dev *vxlan;
   4604	u32 hash_index;
   4605
   4606	rcu_read_lock();
   4607	list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
   4608		vxlan = rcu_dereference(fdb->vdev);
   4609		WARN_ON(!vxlan);
   4610		hash_index = fdb_head_index(vxlan, fdb->eth_addr,
   4611					    vxlan->default_dst.remote_vni);
   4612		spin_lock_bh(&vxlan->hash_lock[hash_index]);
   4613		if (!hlist_unhashed(&fdb->hlist))
   4614			vxlan_fdb_destroy(vxlan, fdb, false, false);
   4615		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
   4616	}
   4617	rcu_read_unlock();
   4618}
   4619
   4620static int vxlan_nexthop_event(struct notifier_block *nb,
   4621			       unsigned long event, void *ptr)
   4622{
   4623	struct nh_notifier_info *info = ptr;
   4624	struct nexthop *nh;
   4625
   4626	if (event != NEXTHOP_EVENT_DEL)
   4627		return NOTIFY_DONE;
   4628
   4629	nh = nexthop_find_by_id(info->net, info->id);
   4630	if (!nh)
   4631		return NOTIFY_DONE;
   4632
   4633	vxlan_fdb_nh_flush(nh);
   4634
   4635	return NOTIFY_DONE;
   4636}
   4637
   4638static __net_init int vxlan_init_net(struct net *net)
   4639{
   4640	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   4641	unsigned int h;
   4642
   4643	INIT_LIST_HEAD(&vn->vxlan_list);
   4644	spin_lock_init(&vn->sock_lock);
   4645	vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
   4646
   4647	for (h = 0; h < PORT_HASH_SIZE; ++h)
   4648		INIT_HLIST_HEAD(&vn->sock_list[h]);
   4649
   4650	return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
   4651					 NULL);
   4652}
   4653
   4654static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
   4655{
   4656	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   4657	struct vxlan_dev *vxlan, *next;
   4658	struct net_device *dev, *aux;
   4659
   4660	for_each_netdev_safe(net, dev, aux)
   4661		if (dev->rtnl_link_ops == &vxlan_link_ops)
   4662			unregister_netdevice_queue(dev, head);
   4663
   4664	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
   4665		/* If vxlan->dev is in the same netns, it has already been added
   4666		 * to the list by the previous loop.
   4667		 */
   4668		if (!net_eq(dev_net(vxlan->dev), net))
   4669			unregister_netdevice_queue(vxlan->dev, head);
   4670	}
   4671
   4672}
   4673
   4674static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
   4675{
   4676	struct net *net;
   4677	LIST_HEAD(list);
   4678	unsigned int h;
   4679
   4680	list_for_each_entry(net, net_list, exit_list) {
   4681		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   4682
   4683		unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
   4684	}
   4685	rtnl_lock();
   4686	list_for_each_entry(net, net_list, exit_list)
   4687		vxlan_destroy_tunnels(net, &list);
   4688
   4689	unregister_netdevice_many(&list);
   4690	rtnl_unlock();
   4691
   4692	list_for_each_entry(net, net_list, exit_list) {
   4693		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
   4694
   4695		for (h = 0; h < PORT_HASH_SIZE; ++h)
   4696			WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
   4697	}
   4698}
   4699
   4700static struct pernet_operations vxlan_net_ops = {
   4701	.init = vxlan_init_net,
   4702	.exit_batch = vxlan_exit_batch_net,
   4703	.id   = &vxlan_net_id,
   4704	.size = sizeof(struct vxlan_net),
   4705};
   4706
   4707static int __init vxlan_init_module(void)
   4708{
   4709	int rc;
   4710
   4711	get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
   4712
   4713	rc = register_pernet_subsys(&vxlan_net_ops);
   4714	if (rc)
   4715		goto out1;
   4716
   4717	rc = register_netdevice_notifier(&vxlan_notifier_block);
   4718	if (rc)
   4719		goto out2;
   4720
   4721	rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
   4722	if (rc)
   4723		goto out3;
   4724
   4725	rc = rtnl_link_register(&vxlan_link_ops);
   4726	if (rc)
   4727		goto out4;
   4728
   4729	vxlan_vnifilter_init();
   4730
   4731	return 0;
   4732out4:
   4733	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
   4734out3:
   4735	unregister_netdevice_notifier(&vxlan_notifier_block);
   4736out2:
   4737	unregister_pernet_subsys(&vxlan_net_ops);
   4738out1:
   4739	return rc;
   4740}
   4741late_initcall(vxlan_init_module);
   4742
   4743static void __exit vxlan_cleanup_module(void)
   4744{
   4745	vxlan_vnifilter_uninit();
   4746	rtnl_link_unregister(&vxlan_link_ops);
   4747	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
   4748	unregister_netdevice_notifier(&vxlan_notifier_block);
   4749	unregister_pernet_subsys(&vxlan_net_ops);
   4750	/* rcu_barrier() is called by netns */
   4751}
   4752module_exit(vxlan_cleanup_module);
   4753
   4754MODULE_LICENSE("GPL");
   4755MODULE_VERSION(VXLAN_VERSION);
   4756MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
   4757MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
   4758MODULE_ALIAS_RTNL_LINK("vxlan");