vxlan.c 82.5 KB
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/*
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 * VXLAN: Virtual eXtensible Local Area Network
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 *
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 * Copyright (c) 2012-2013 Vyatta Inc.
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/rculist.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/hash.h>
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#include <linux/ethtool.h>
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#include <net/arp.h>
#include <net/ndisc.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/icmp.h>
#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#include <net/rtnetlink.h>
#include <net/route.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
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#include <net/vxlan.h>
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#include <net/protocol.h>
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#include <net/udp_tunnel.h>
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#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#endif
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#include <net/dst_metadata.h>
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#define VXLAN_VERSION	"0.1"

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#define PORT_HASH_BITS	8
#define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
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#define FDB_AGE_DEFAULT 300 /* 5 min */
#define FDB_AGE_INTERVAL (10 * HZ)	/* rescan interval */

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/* UDP port for VXLAN traffic.
 * The IANA assigned port is 4789, but the Linux default is 8472
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 * for compatibility with early adopters.
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 */
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static unsigned short vxlan_port __read_mostly = 8472;
module_param_named(udp_port, vxlan_port, ushort, 0444);
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MODULE_PARM_DESC(udp_port, "Destination UDP port");

static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

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static int vxlan_net_id;
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static struct rtnl_link_ops vxlan_link_ops;
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static const u8 all_zeros_mac[ETH_ALEN + 2];
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static int vxlan_sock_add(struct vxlan_dev *vxlan);
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/* per-network namespace private data for this module */
struct vxlan_net {
	struct list_head  vxlan_list;
	struct hlist_head sock_list[PORT_HASH_SIZE];
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	spinlock_t	  sock_lock;
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};

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/* Forwarding table entry */
struct vxlan_fdb {
	struct hlist_node hlist;	/* linked list of entries */
	struct rcu_head	  rcu;
	unsigned long	  updated;	/* jiffies */
	unsigned long	  used;
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	struct list_head  remotes;
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	u8		  eth_addr[ETH_ALEN];
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	u16		  state;	/* see ndm_state */
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	u8		  flags;	/* see ndm_flags */
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};

/* salt for hash table */
static u32 vxlan_salt __read_mostly;
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static struct workqueue_struct *vxlan_wq;
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static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
{
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	return vs->flags & VXLAN_F_COLLECT_METADATA ||
	       ip_tunnel_collect_metadata();
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}

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#if IS_ENABLED(CONFIG_IPV6)
static inline
bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
{
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	if (a->sa.sa_family != b->sa.sa_family)
		return false;
	if (a->sa.sa_family == AF_INET6)
		return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
	else
		return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
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}

static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
{
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	if (ipa->sa.sa_family == AF_INET6)
		return ipv6_addr_any(&ipa->sin6.sin6_addr);
	else
		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
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}

static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
{
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	if (ipa->sa.sa_family == AF_INET6)
		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
	else
		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
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}

static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
{
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	if (nla_len(nla) >= sizeof(struct in6_addr)) {
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		ip->sin6.sin6_addr = nla_get_in6_addr(nla);
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		ip->sa.sa_family = AF_INET6;
		return 0;
	} else if (nla_len(nla) >= sizeof(__be32)) {
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		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
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		ip->sa.sa_family = AF_INET;
		return 0;
	} else {
		return -EAFNOSUPPORT;
	}
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}

static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
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			      const union vxlan_addr *ip)
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{
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	if (ip->sa.sa_family == AF_INET6)
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		return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
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	else
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		return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
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}

#else /* !CONFIG_IPV6 */

static inline
bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
{
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	return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
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}

static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
{
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	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
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}

static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
{
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	return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
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}

static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
{
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	if (nla_len(nla) >= sizeof(struct in6_addr)) {
		return -EAFNOSUPPORT;
	} else if (nla_len(nla) >= sizeof(__be32)) {
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		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
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		ip->sa.sa_family = AF_INET;
		return 0;
	} else {
		return -EAFNOSUPPORT;
	}
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}

static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
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			      const union vxlan_addr *ip)
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{
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	return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
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}
#endif

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/* Virtual Network hash table head */
static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
{
	return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
}

/* Socket hash table head */
static inline struct hlist_head *vs_head(struct net *net, __be16 port)
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{
	struct vxlan_net *vn = net_generic(net, vxlan_net_id);

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	return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
}

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/* First remote destination for a forwarding entry.
 * Guaranteed to be non-NULL because remotes are never deleted.
 */
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static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
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{
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	return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
}

static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
{
	return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
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}

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/* Find VXLAN socket based on network namespace, address family and UDP port
 * and enabled unshareable flags.
 */
static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
					  __be16 port, u32 flags)
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{
	struct vxlan_sock *vs;
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	flags &= VXLAN_F_RCV_FLAGS;
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	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
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		if (inet_sk(vs->sock->sk)->inet_sport == port &&
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		    vxlan_get_sk_family(vs) == family &&
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		    vs->flags == flags)
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			return vs;
	}
	return NULL;
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}

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static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
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{
	struct vxlan_dev *vxlan;

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	hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
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		if (vxlan->default_dst.remote_vni == id)
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			return vxlan;
	}

	return NULL;
}

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/* Look up VNI in a per net namespace table */
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static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
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					sa_family_t family, __be16 port,
					u32 flags)
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{
	struct vxlan_sock *vs;

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	vs = vxlan_find_sock(net, family, port, flags);
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	if (!vs)
		return NULL;

	return vxlan_vs_find_vni(vs, id);
}

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/* Fill in neighbour message in skbuff. */
static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
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			  const struct vxlan_fdb *fdb,
			  u32 portid, u32 seq, int type, unsigned int flags,
			  const struct vxlan_rdst *rdst)
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{
	unsigned long now = jiffies;
	struct nda_cacheinfo ci;
	struct nlmsghdr *nlh;
	struct ndmsg *ndm;
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	bool send_ip, send_eth;
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	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
	if (nlh == NULL)
		return -EMSGSIZE;

	ndm = nlmsg_data(nlh);
	memset(ndm, 0, sizeof(*ndm));
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	send_eth = send_ip = true;

	if (type == RTM_GETNEIGH) {
		ndm->ndm_family	= AF_INET;
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		send_ip = !vxlan_addr_any(&rdst->remote_ip);
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		send_eth = !is_zero_ether_addr(fdb->eth_addr);
	} else
		ndm->ndm_family	= AF_BRIDGE;
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	ndm->ndm_state = fdb->state;
	ndm->ndm_ifindex = vxlan->dev->ifindex;
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	ndm->ndm_flags = fdb->flags;
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	ndm->ndm_type = RTN_UNICAST;
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	if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
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	    nla_put_s32(skb, NDA_LINK_NETNSID,
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			peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
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		goto nla_put_failure;

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	if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
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		goto nla_put_failure;

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	if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
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		goto nla_put_failure;

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	if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
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	    nla_put_be16(skb, NDA_PORT, rdst->remote_port))
		goto nla_put_failure;
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	if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
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	    nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
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		goto nla_put_failure;
	if (rdst->remote_ifindex &&
	    nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
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		goto nla_put_failure;

	ci.ndm_used	 = jiffies_to_clock_t(now - fdb->used);
	ci.ndm_confirmed = 0;
	ci.ndm_updated	 = jiffies_to_clock_t(now - fdb->updated);
	ci.ndm_refcnt	 = 0;

	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
		goto nla_put_failure;

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	nlmsg_end(skb, nlh);
	return 0;
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nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t vxlan_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct ndmsg))
		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
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		+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
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		+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
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		+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
		+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
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		+ nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
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		+ nla_total_size(sizeof(struct nda_cacheinfo));
}

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static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
			     struct vxlan_rdst *rd, int type)
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{
	struct net *net = dev_net(vxlan->dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;

	skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
	if (skb == NULL)
		goto errout;

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	err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
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	if (err < 0) {
		/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}

	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
	return;
errout:
	if (err < 0)
		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}

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static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
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{
	struct vxlan_dev *vxlan = netdev_priv(dev);
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	struct vxlan_fdb f = {
		.state = NUD_STALE,
	};
	struct vxlan_rdst remote = {
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		.remote_ip = *ipa, /* goes to NDA_DST */
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		.remote_vni = VXLAN_N_VID,
	};
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	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
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}

static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
{
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	struct vxlan_fdb f = {
		.state = NUD_STALE,
	};
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	struct vxlan_rdst remote = { };
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	memcpy(f.eth_addr, eth_addr, ETH_ALEN);

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	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
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}

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/* Hash Ethernet address */
static u32 eth_hash(const unsigned char *addr)
{
	u64 value = get_unaligned((u64 *)addr);

	/* only want 6 bytes */
#ifdef __BIG_ENDIAN
	value >>= 16;
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#else
	value <<= 16;
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#endif
	return hash_64(value, FDB_HASH_BITS);
}

/* Hash chain to use given mac address */
static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
						const u8 *mac)
{
	return &vxlan->fdb_head[eth_hash(mac)];
}

/* Look up Ethernet address in forwarding table */
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static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
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					const u8 *mac)
{
	struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
	struct vxlan_fdb *f;

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	hlist_for_each_entry_rcu(f, head, hlist) {
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		if (ether_addr_equal(mac, f->eth_addr))
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			return f;
	}

	return NULL;
}

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static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
					const u8 *mac)
{
	struct vxlan_fdb *f;

	f = __vxlan_find_mac(vxlan, mac);
	if (f)
		f->used = jiffies;

	return f;
}

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/* caller should hold vxlan->hash_lock */
static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
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					      union vxlan_addr *ip, __be16 port,
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					      __u32 vni, __u32 ifindex)
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{
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	struct vxlan_rdst *rd;
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	list_for_each_entry(rd, &f->remotes, list) {
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		if (vxlan_addr_equal(&rd->remote_ip, ip) &&
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		    rd->remote_port == port &&
		    rd->remote_vni == vni &&
		    rd->remote_ifindex == ifindex)
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			return rd;
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	}
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	return NULL;
}

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/* Replace destination of unicast mac */
static int vxlan_fdb_replace(struct vxlan_fdb *f,
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			     union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
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{
	struct vxlan_rdst *rd;

	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
	if (rd)
		return 0;

	rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
	if (!rd)
		return 0;
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	rd->remote_ip = *ip;
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	rd->remote_port = port;
	rd->remote_vni = vni;
	rd->remote_ifindex = ifindex;
	return 1;
}

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/* Add/update destinations for multicast */
static int vxlan_fdb_append(struct vxlan_fdb *f,
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			    union vxlan_addr *ip, __be16 port, __u32 vni,
			    __u32 ifindex, struct vxlan_rdst **rdp)
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{
	struct vxlan_rdst *rd;

	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
	if (rd)
		return 0;

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	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
	if (rd == NULL)
		return -ENOBUFS;
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	rd->remote_ip = *ip;
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	rd->remote_port = port;
	rd->remote_vni = vni;
	rd->remote_ifindex = ifindex;
508 509 510

	list_add_tail_rcu(&rd->list, &f->remotes);

511
	*rdp = rd;
512 513 514
	return 1;
}

T
Tom Herbert 已提交
515 516 517
static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
					  unsigned int off,
					  struct vxlanhdr *vh, size_t hdrlen,
518 519
					  u32 data, struct gro_remcsum *grc,
					  bool nopartial)
T
Tom Herbert 已提交
520
{
521
	size_t start, offset;
T
Tom Herbert 已提交
522 523

	if (skb->remcsum_offload)
524
		return vh;
T
Tom Herbert 已提交
525 526 527 528 529 530 531 532 533

	if (!NAPI_GRO_CB(skb)->csum_valid)
		return NULL;

	start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
	offset = start + ((data & VXLAN_RCO_UDP) ?
			  offsetof(struct udphdr, check) :
			  offsetof(struct tcphdr, check));

534 535
	vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
				     start, offset, grc, nopartial);
T
Tom Herbert 已提交
536 537 538 539 540 541

	skb->remcsum_offload = 1;

	return vh;
}

542 543 544
static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
					  struct sk_buff *skb,
					  struct udp_offload *uoff)
545 546 547
{
	struct sk_buff *p, **pp = NULL;
	struct vxlanhdr *vh, *vh2;
548
	unsigned int hlen, off_vx;
549
	int flush = 1;
T
Tom Herbert 已提交
550 551 552
	struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
					     udp_offloads);
	u32 flags;
553 554 555
	struct gro_remcsum grc;

	skb_gro_remcsum_init(&grc);
556 557 558 559 560 561 562 563 564 565

	off_vx = skb_gro_offset(skb);
	hlen = off_vx + sizeof(*vh);
	vh   = skb_gro_header_fast(skb, off_vx);
	if (skb_gro_header_hard(skb, hlen)) {
		vh = skb_gro_header_slow(skb, hlen, off_vx);
		if (unlikely(!vh))
			goto out;
	}

T
Tom Herbert 已提交
566 567 568 569 570 571
	skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));

	flags = ntohl(vh->vx_flags);

	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
		vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
572 573 574
				       ntohl(vh->vx_vni), &grc,
				       !!(vs->flags &
					  VXLAN_F_REMCSUM_NOPARTIAL));
T
Tom Herbert 已提交
575 576 577 578 579

		if (!vh)
			goto out;
	}

580 581
	skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */

582 583 584 585 586 587 588
	flush = 0;

	for (p = *head; p; p = p->next) {
		if (!NAPI_GRO_CB(p)->same_flow)
			continue;

		vh2 = (struct vxlanhdr *)(p->data + off_vx);
T
Thomas Graf 已提交
589 590
		if (vh->vx_flags != vh2->vx_flags ||
		    vh->vx_vni != vh2->vx_vni) {
591 592 593 594 595
			NAPI_GRO_CB(p)->same_flow = 0;
			continue;
		}
	}

596
	pp = eth_gro_receive(head, skb);
597 598

out:
599
	skb_gro_remcsum_cleanup(skb, &grc);
600 601 602 603 604
	NAPI_GRO_CB(skb)->flush |= flush;

	return pp;
}

605 606
static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
			      struct udp_offload *uoff)
607
{
608 609
	udp_tunnel_gro_complete(skb, nhoff);

610
	return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
611 612
}

613
/* Notify netdevs that UDP port started listening */
614
static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
615 616
{
	struct net_device *dev;
617
	struct sock *sk = vs->sock->sk;
618
	struct net *net = sock_net(sk);
619
	sa_family_t sa_family = vxlan_get_sk_family(vs);
J
Joseph Gasparakis 已提交
620
	__be16 port = inet_sk(sk)->inet_sport;
621 622 623
	int err;

	if (sa_family == AF_INET) {
624
		err = udp_add_offload(net, &vs->udp_offloads);
625 626 627
		if (err)
			pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
	}
628 629 630 631 632 633 634 635 636 637 638

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		if (dev->netdev_ops->ndo_add_vxlan_port)
			dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
							    port);
	}
	rcu_read_unlock();
}

/* Notify netdevs that UDP port is no more listening */
639
static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
640 641
{
	struct net_device *dev;
642
	struct sock *sk = vs->sock->sk;
643
	struct net *net = sock_net(sk);
644
	sa_family_t sa_family = vxlan_get_sk_family(vs);
J
Joseph Gasparakis 已提交
645
	__be16 port = inet_sk(sk)->inet_sport;
646 647 648 649 650 651 652 653

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		if (dev->netdev_ops->ndo_del_vxlan_port)
			dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
							    port);
	}
	rcu_read_unlock();
654 655 656

	if (sa_family == AF_INET)
		udp_del_offload(&vs->udp_offloads);
657 658
}

S
stephen hemminger 已提交
659 660
/* Add new entry to forwarding table -- assumes lock held */
static int vxlan_fdb_create(struct vxlan_dev *vxlan,
C
Cong Wang 已提交
661
			    const u8 *mac, union vxlan_addr *ip,
662
			    __u16 state, __u16 flags,
663
			    __be16 port, __u32 vni, __u32 ifindex,
664
			    __u8 ndm_flags)
S
stephen hemminger 已提交
665
{
666
	struct vxlan_rdst *rd = NULL;
S
stephen hemminger 已提交
667 668 669
	struct vxlan_fdb *f;
	int notify = 0;

670
	f = __vxlan_find_mac(vxlan, mac);
S
stephen hemminger 已提交
671 672 673 674 675 676 677 678 679 680 681
	if (f) {
		if (flags & NLM_F_EXCL) {
			netdev_dbg(vxlan->dev,
				   "lost race to create %pM\n", mac);
			return -EEXIST;
		}
		if (f->state != state) {
			f->state = state;
			f->updated = jiffies;
			notify = 1;
		}
682 683 684 685 686
		if (f->flags != ndm_flags) {
			f->flags = ndm_flags;
			f->updated = jiffies;
			notify = 1;
		}
687 688 689 690
		if ((flags & NLM_F_REPLACE)) {
			/* Only change unicasts */
			if (!(is_multicast_ether_addr(f->eth_addr) ||
			     is_zero_ether_addr(f->eth_addr))) {
691
				notify |= vxlan_fdb_replace(f, ip, port, vni,
692 693 694 695
							   ifindex);
			} else
				return -EOPNOTSUPP;
		}
696
		if ((flags & NLM_F_APPEND) &&
697 698
		    (is_multicast_ether_addr(f->eth_addr) ||
		     is_zero_ether_addr(f->eth_addr))) {
699 700
			int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
						  &rd);
701 702 703 704 705

			if (rc < 0)
				return rc;
			notify |= rc;
		}
S
stephen hemminger 已提交
706 707 708 709
	} else {
		if (!(flags & NLM_F_CREATE))
			return -ENOENT;

710 711
		if (vxlan->cfg.addrmax &&
		    vxlan->addrcnt >= vxlan->cfg.addrmax)
S
stephen hemminger 已提交
712 713
			return -ENOSPC;

714 715 716 717 718
		/* Disallow replace to add a multicast entry */
		if ((flags & NLM_F_REPLACE) &&
		    (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
			return -EOPNOTSUPP;

C
Cong Wang 已提交
719
		netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
S
stephen hemminger 已提交
720 721 722 723 724 725
		f = kmalloc(sizeof(*f), GFP_ATOMIC);
		if (!f)
			return -ENOMEM;

		notify = 1;
		f->state = state;
726
		f->flags = ndm_flags;
S
stephen hemminger 已提交
727
		f->updated = f->used = jiffies;
728
		INIT_LIST_HEAD(&f->remotes);
S
stephen hemminger 已提交
729 730
		memcpy(f->eth_addr, mac, ETH_ALEN);

731
		vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
732

S
stephen hemminger 已提交
733 734 735 736 737
		++vxlan->addrcnt;
		hlist_add_head_rcu(&f->hlist,
				   vxlan_fdb_head(vxlan, mac));
	}

738 739 740 741 742
	if (notify) {
		if (rd == NULL)
			rd = first_remote_rtnl(f);
		vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
	}
S
stephen hemminger 已提交
743 744 745 746

	return 0;
}

W
Wei Yongjun 已提交
747
static void vxlan_fdb_free(struct rcu_head *head)
748 749
{
	struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
750
	struct vxlan_rdst *rd, *nd;
751

752
	list_for_each_entry_safe(rd, nd, &f->remotes, list)
753 754 755 756
		kfree(rd);
	kfree(f);
}

S
stephen hemminger 已提交
757 758 759 760 761 762
static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
{
	netdev_dbg(vxlan->dev,
		    "delete %pM\n", f->eth_addr);

	--vxlan->addrcnt;
763
	vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
S
stephen hemminger 已提交
764 765

	hlist_del_rcu(&f->hlist);
766
	call_rcu(&f->rcu, vxlan_fdb_free);
S
stephen hemminger 已提交
767 768
}

M
Mike Rapoport 已提交
769
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
C
Cong Wang 已提交
770
			   union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
S
stephen hemminger 已提交
771
{
772
	struct net *net = dev_net(vxlan->dev);
C
Cong Wang 已提交
773
	int err;
S
stephen hemminger 已提交
774

M
Mike Rapoport 已提交
775
	if (tb[NDA_DST]) {
C
Cong Wang 已提交
776 777 778
		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
		if (err)
			return err;
M
Mike Rapoport 已提交
779
	} else {
C
Cong Wang 已提交
780 781 782 783 784 785 786 787 788 789
		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
		if (remote->sa.sa_family == AF_INET) {
			ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
			ip->sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
		} else {
			ip->sin6.sin6_addr = in6addr_any;
			ip->sa.sa_family = AF_INET6;
#endif
		}
M
Mike Rapoport 已提交
790
	}
S
stephen hemminger 已提交
791

792
	if (tb[NDA_PORT]) {
793
		if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
794
			return -EINVAL;
M
Mike Rapoport 已提交
795 796
		*port = nla_get_be16(tb[NDA_PORT]);
	} else {
797
		*port = vxlan->cfg.dst_port;
M
Mike Rapoport 已提交
798
	}
799 800 801 802

	if (tb[NDA_VNI]) {
		if (nla_len(tb[NDA_VNI]) != sizeof(u32))
			return -EINVAL;
M
Mike Rapoport 已提交
803 804 805 806
		*vni = nla_get_u32(tb[NDA_VNI]);
	} else {
		*vni = vxlan->default_dst.remote_vni;
	}
807 808

	if (tb[NDA_IFINDEX]) {
P
Pravin B Shelar 已提交
809
		struct net_device *tdev;
810 811 812

		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
			return -EINVAL;
M
Mike Rapoport 已提交
813
		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
814
		tdev = __dev_get_by_index(net, *ifindex);
P
Pravin B Shelar 已提交
815
		if (!tdev)
816
			return -EADDRNOTAVAIL;
M
Mike Rapoport 已提交
817 818 819 820 821 822 823 824 825 826
	} else {
		*ifindex = 0;
	}

	return 0;
}

/* Add static entry (via netlink) */
static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
			 struct net_device *dev,
827
			 const unsigned char *addr, u16 vid, u16 flags)
M
Mike Rapoport 已提交
828 829 830
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	/* struct net *net = dev_net(vxlan->dev); */
C
Cong Wang 已提交
831
	union vxlan_addr ip;
M
Mike Rapoport 已提交
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847
	__be16 port;
	u32 vni, ifindex;
	int err;

	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
		pr_info("RTM_NEWNEIGH with invalid state %#x\n",
			ndm->ndm_state);
		return -EINVAL;
	}

	if (tb[NDA_DST] == NULL)
		return -EINVAL;

	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
	if (err)
		return err;
848

849 850 851
	if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
		return -EAFNOSUPPORT;

S
stephen hemminger 已提交
852
	spin_lock_bh(&vxlan->hash_lock);
C
Cong Wang 已提交
853
	err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
854
			       port, vni, ifindex, ndm->ndm_flags);
S
stephen hemminger 已提交
855 856 857 858 859 860
	spin_unlock_bh(&vxlan->hash_lock);

	return err;
}

/* Delete entry (via netlink) */
861 862
static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
			    struct net_device *dev,
863
			    const unsigned char *addr, u16 vid)
S
stephen hemminger 已提交
864 865 866
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct vxlan_fdb *f;
867
	struct vxlan_rdst *rd = NULL;
C
Cong Wang 已提交
868
	union vxlan_addr ip;
869 870 871 872 873 874 875 876 877
	__be16 port;
	u32 vni, ifindex;
	int err;

	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
	if (err)
		return err;

	err = -ENOENT;
S
stephen hemminger 已提交
878 879 880

	spin_lock_bh(&vxlan->hash_lock);
	f = vxlan_find_mac(vxlan, addr);
881 882 883
	if (!f)
		goto out;

C
Cong Wang 已提交
884 885
	if (!vxlan_addr_any(&ip)) {
		rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
886 887 888 889 890 891 892 893 894 895 896
		if (!rd)
			goto out;
	}

	err = 0;

	/* remove a destination if it's not the only one on the list,
	 * otherwise destroy the fdb entry
	 */
	if (rd && !list_is_singular(&f->remotes)) {
		list_del_rcu(&rd->list);
897
		vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
898
		kfree_rcu(rd, rcu);
899
		goto out;
S
stephen hemminger 已提交
900
	}
901 902 903 904

	vxlan_fdb_destroy(vxlan, f);

out:
S
stephen hemminger 已提交
905 906 907 908 909 910 911
	spin_unlock_bh(&vxlan->hash_lock);

	return err;
}

/* Dump forwarding table */
static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
912 913
			  struct net_device *dev,
			  struct net_device *filter_dev, int idx)
S
stephen hemminger 已提交
914 915 916 917 918 919 920 921
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	unsigned int h;

	for (h = 0; h < FDB_HASH_SIZE; ++h) {
		struct vxlan_fdb *f;
		int err;

922
		hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
923 924
			struct vxlan_rdst *rd;

925
			list_for_each_entry_rcu(rd, &f->remotes, list) {
926 927 928
				if (idx < cb->args[0])
					goto skip;

929 930 931 932 933
				err = vxlan_fdb_info(skb, vxlan, f,
						     NETLINK_CB(cb->skb).portid,
						     cb->nlh->nlmsg_seq,
						     RTM_NEWNEIGH,
						     NLM_F_MULTI, rd);
934 935
				if (err < 0) {
					cb->args[1] = err;
936
					goto out;
937
				}
938
skip:
939 940
				++idx;
			}
S
stephen hemminger 已提交
941 942
		}
	}
943
out:
S
stephen hemminger 已提交
944 945 946 947 948
	return idx;
}

/* Watch incoming packets to learn mapping between Ethernet address
 * and Tunnel endpoint.
949
 * Return true if packet is bogus and should be dropped.
S
stephen hemminger 已提交
950
 */
951
static bool vxlan_snoop(struct net_device *dev,
C
Cong Wang 已提交
952
			union vxlan_addr *src_ip, const u8 *src_mac)
S
stephen hemminger 已提交
953 954 955 956 957 958
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct vxlan_fdb *f;

	f = vxlan_find_mac(vxlan, src_mac);
	if (likely(f)) {
959
		struct vxlan_rdst *rdst = first_remote_rcu(f);
960

C
Cong Wang 已提交
961
		if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
962 963 964
			return false;

		/* Don't migrate static entries, drop packets */
965
		if (f->state & NUD_NOARP)
966
			return true;
S
stephen hemminger 已提交
967 968 969

		if (net_ratelimit())
			netdev_info(dev,
C
Cong Wang 已提交
970
				    "%pM migrated from %pIS to %pIS\n",
971
				    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
S
stephen hemminger 已提交
972

C
Cong Wang 已提交
973
		rdst->remote_ip = *src_ip;
S
stephen hemminger 已提交
974
		f->updated = jiffies;
975
		vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
S
stephen hemminger 已提交
976 977 978
	} else {
		/* learned new entry */
		spin_lock(&vxlan->hash_lock);
979 980 981 982 983 984

		/* close off race between vxlan_flush and incoming packets */
		if (netif_running(dev))
			vxlan_fdb_create(vxlan, src_mac, src_ip,
					 NUD_REACHABLE,
					 NLM_F_EXCL|NLM_F_CREATE,
985
					 vxlan->cfg.dst_port,
986 987
					 vxlan->default_dst.remote_vni,
					 0, NTF_SELF);
S
stephen hemminger 已提交
988 989
		spin_unlock(&vxlan->hash_lock);
	}
990 991

	return false;
S
stephen hemminger 已提交
992 993 994
}

/* See if multicast group is already in use by other ID */
995
static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
S
stephen hemminger 已提交
996
{
997
	struct vxlan_dev *vxlan;
998
	unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
S
stephen hemminger 已提交
999

1000 1001 1002
	/* The vxlan_sock is only used by dev, leaving group has
	 * no effect on other vxlan devices.
	 */
1003 1004
	if (family == AF_INET && dev->vn4_sock &&
	    atomic_read(&dev->vn4_sock->refcnt) == 1)
1005
		return false;
1006 1007 1008 1009 1010
#if IS_ENABLED(CONFIG_IPV6)
	if (family == AF_INET6 && dev->vn6_sock &&
	    atomic_read(&dev->vn6_sock->refcnt) == 1)
		return false;
#endif
1011

1012
	list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1013
		if (!netif_running(vxlan->dev) || vxlan == dev)
1014
			continue;
S
stephen hemminger 已提交
1015

1016
		if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1017
			continue;
1018 1019 1020 1021
#if IS_ENABLED(CONFIG_IPV6)
		if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
			continue;
#endif
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031

		if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
				      &dev->default_dst.remote_ip))
			continue;

		if (vxlan->default_dst.remote_ifindex !=
		    dev->default_dst.remote_ifindex)
			continue;

		return true;
1032
	}
S
stephen hemminger 已提交
1033 1034 1035 1036

	return false;
}

1037
static void __vxlan_sock_release(struct vxlan_sock *vs)
1038
{
1039
	struct vxlan_net *vn;
1040

1041 1042
	if (!vs)
		return;
1043 1044
	if (!atomic_dec_and_test(&vs->refcnt))
		return;
S
stephen hemminger 已提交
1045

1046
	vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047
	spin_lock(&vn->sock_lock);
1048
	hlist_del_rcu(&vs->hlist);
1049
	vxlan_notify_del_rx_port(vs);
1050 1051
	spin_unlock(&vn->sock_lock);

1052
	queue_work(vxlan_wq, &vs->del_work);
S
stephen hemminger 已提交
1053 1054
}

1055 1056 1057 1058 1059 1060 1061 1062
static void vxlan_sock_release(struct vxlan_dev *vxlan)
{
	__vxlan_sock_release(vxlan->vn4_sock);
#if IS_ENABLED(CONFIG_IPV6)
	__vxlan_sock_release(vxlan->vn6_sock);
#endif
}

1063
/* Update multicast group membership when first VNI on
1064
 * multicast address is brought up
1065
 */
1066
static int vxlan_igmp_join(struct vxlan_dev *vxlan)
S
stephen hemminger 已提交
1067
{
1068
	struct sock *sk;
C
Cong Wang 已提交
1069 1070
	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
	int ifindex = vxlan->default_dst.remote_ifindex;
1071
	int ret = -EINVAL;
S
stephen hemminger 已提交
1072

C
Cong Wang 已提交
1073 1074 1075 1076 1077 1078
	if (ip->sa.sa_family == AF_INET) {
		struct ip_mreqn mreq = {
			.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
			.imr_ifindex		= ifindex,
		};

1079 1080
		sk = vxlan->vn4_sock->sock->sk;
		lock_sock(sk);
1081
		ret = ip_mc_join_group(sk, &mreq);
1082
		release_sock(sk);
C
Cong Wang 已提交
1083 1084
#if IS_ENABLED(CONFIG_IPV6)
	} else {
1085 1086
		sk = vxlan->vn6_sock->sock->sk;
		lock_sock(sk);
1087 1088
		ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
						   &ip->sin6.sin6_addr);
1089
		release_sock(sk);
C
Cong Wang 已提交
1090 1091
#endif
	}
S
stephen hemminger 已提交
1092

1093
	return ret;
S
stephen hemminger 已提交
1094 1095 1096
}

/* Inverse of vxlan_igmp_join when last VNI is brought down */
1097
static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
S
stephen hemminger 已提交
1098
{
1099
	struct sock *sk;
C
Cong Wang 已提交
1100 1101
	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
	int ifindex = vxlan->default_dst.remote_ifindex;
1102
	int ret = -EINVAL;
S
stephen hemminger 已提交
1103

C
Cong Wang 已提交
1104 1105 1106 1107 1108 1109
	if (ip->sa.sa_family == AF_INET) {
		struct ip_mreqn mreq = {
			.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
			.imr_ifindex		= ifindex,
		};

1110 1111
		sk = vxlan->vn4_sock->sock->sk;
		lock_sock(sk);
1112
		ret = ip_mc_leave_group(sk, &mreq);
1113
		release_sock(sk);
C
Cong Wang 已提交
1114 1115
#if IS_ENABLED(CONFIG_IPV6)
	} else {
1116 1117
		sk = vxlan->vn6_sock->sock->sk;
		lock_sock(sk);
1118 1119
		ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
						   &ip->sin6.sin6_addr);
1120
		release_sock(sk);
C
Cong Wang 已提交
1121 1122
#endif
	}
S
stephen hemminger 已提交
1123

1124
	return ret;
S
stephen hemminger 已提交
1125 1126
}

T
Tom Herbert 已提交
1127
static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1128
				      size_t hdrlen, u32 data, bool nopartial)
T
Tom Herbert 已提交
1129 1130 1131
{
	size_t start, offset, plen;

1132 1133 1134
	if (skb->remcsum_offload)
		return vh;

T
Tom Herbert 已提交
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
	start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
	offset = start + ((data & VXLAN_RCO_UDP) ?
			  offsetof(struct udphdr, check) :
			  offsetof(struct tcphdr, check));

	plen = hdrlen + offset + sizeof(u16);

	if (!pskb_may_pull(skb, plen))
		return NULL;

	vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);

1147 1148
	skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
			    nopartial);
T
Tom Herbert 已提交
1149 1150 1151 1152

	return vh;
}

1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
		      struct vxlan_metadata *md, u32 vni,
		      struct metadata_dst *tun_dst)
{
	struct iphdr *oip = NULL;
	struct ipv6hdr *oip6 = NULL;
	struct vxlan_dev *vxlan;
	struct pcpu_sw_netstats *stats;
	union vxlan_addr saddr;
	int err = 0;

	/* For flow based devices, map all packets to VNI 0 */
1165
	if (vs->flags & VXLAN_F_COLLECT_METADATA)
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
		vni = 0;

	/* Is this VNI defined? */
	vxlan = vxlan_vs_find_vni(vs, vni);
	if (!vxlan)
		goto drop;

	skb_reset_mac_header(skb);
	skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
	skb->protocol = eth_type_trans(skb, vxlan->dev);
	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

	/* Ignore packet loops (and multicast echo) */
	if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
		goto drop;

1182 1183
	/* Get data from the outer IP header */
	if (vxlan_get_sk_family(vs) == AF_INET) {
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
		oip = ip_hdr(skb);
		saddr.sin.sin_addr.s_addr = oip->saddr;
		saddr.sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
	} else {
		oip6 = ipv6_hdr(skb);
		saddr.sin6.sin6_addr = oip6->saddr;
		saddr.sa.sa_family = AF_INET6;
#endif
	}

	if (tun_dst) {
		skb_dst_set(skb, (struct dst_entry *)tun_dst);
		tun_dst = NULL;
	}

	if ((vxlan->flags & VXLAN_F_LEARN) &&
	    vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
		goto drop;

	skb_reset_network_header(skb);
	/* In flow-based mode, GBP is carried in dst_metadata */
1206
	if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
		skb->mark = md->gbp;

	if (oip6)
		err = IP6_ECN_decapsulate(oip6, skb);
	if (oip)
		err = IP_ECN_decapsulate(oip, skb);

	if (unlikely(err)) {
		if (log_ecn_error) {
			if (oip6)
				net_info_ratelimited("non-ECT from %pI6\n",
						     &oip6->saddr);
			if (oip)
				net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
						     &oip->saddr, oip->tos);
		}
		if (err > 1) {
			++vxlan->dev->stats.rx_frame_errors;
			++vxlan->dev->stats.rx_errors;
			goto drop;
		}
	}

	stats = this_cpu_ptr(vxlan->dev->tstats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

T
Tom Herbert 已提交
1236
	gro_cells_receive(&vxlan->gro_cells, skb);
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246

	return;
drop:
	if (tun_dst)
		dst_release((struct dst_entry *)tun_dst);

	/* Consume bad packet */
	kfree_skb(skb);
}

S
stephen hemminger 已提交
1247 1248 1249
/* Callback from net/ipv4/udp.c to receive packets */
static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
T
Thomas Graf 已提交
1250
	struct metadata_dst *tun_dst = NULL;
P
Pravin B Shelar 已提交
1251
	struct vxlan_sock *vs;
S
stephen hemminger 已提交
1252
	struct vxlanhdr *vxh;
1253
	u32 flags, vni;
T
Thomas Graf 已提交
1254 1255
	struct vxlan_metadata _md;
	struct vxlan_metadata *md = &_md;
S
stephen hemminger 已提交
1256 1257

	/* Need Vxlan and inner Ethernet header to be present */
1258
	if (!pskb_may_pull(skb, VXLAN_HLEN))
S
stephen hemminger 已提交
1259 1260
		goto error;

1261
	vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1262 1263 1264 1265 1266 1267 1268 1269
	flags = ntohl(vxh->vx_flags);
	vni = ntohl(vxh->vx_vni);

	if (flags & VXLAN_HF_VNI) {
		flags &= ~VXLAN_HF_VNI;
	} else {
		/* VNI flag always required to be set */
		goto bad_flags;
S
stephen hemminger 已提交
1270 1271
	}

P
Pravin B Shelar 已提交
1272 1273
	if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
		goto drop;
T
Tom Herbert 已提交
1274
	vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
P
Pravin B Shelar 已提交
1275

1276
	vs = rcu_dereference_sk_user_data(sk);
P
Pravin B Shelar 已提交
1277
	if (!vs)
S
stephen hemminger 已提交
1278 1279
		goto drop;

T
Tom Herbert 已提交
1280
	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1281 1282
		vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
				    !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
T
Tom Herbert 已提交
1283 1284 1285 1286
		if (!vxh)
			goto drop;

		flags &= ~VXLAN_HF_RCO;
1287
		vni &= VXLAN_VNI_MASK;
T
Tom Herbert 已提交
1288 1289
	}

T
Thomas Graf 已提交
1290
	if (vxlan_collect_metadata(vs)) {
1291 1292 1293
		tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
					 cpu_to_be64(vni >> 8), sizeof(*md));

T
Thomas Graf 已提交
1294 1295 1296
		if (!tun_dst)
			goto drop;

1297
		md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
T
Thomas Graf 已提交
1298 1299 1300 1301
	} else {
		memset(md, 0, sizeof(*md));
	}

T
Thomas Graf 已提交
1302 1303 1304 1305 1306 1307 1308
	/* For backwards compatibility, only allow reserved fields to be
	 * used by VXLAN extensions if explicitly requested.
	 */
	if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
		struct vxlanhdr_gbp *gbp;

		gbp = (struct vxlanhdr_gbp *)vxh;
T
Thomas Graf 已提交
1309 1310 1311
		md->gbp = ntohs(gbp->policy_id);

		if (tun_dst)
1312
			tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
T
Thomas Graf 已提交
1313 1314

		if (gbp->dont_learn)
T
Thomas Graf 已提交
1315
			md->gbp |= VXLAN_GBP_DONT_LEARN;
T
Thomas Graf 已提交
1316 1317

		if (gbp->policy_applied)
T
Thomas Graf 已提交
1318
			md->gbp |= VXLAN_GBP_POLICY_APPLIED;
T
Thomas Graf 已提交
1319 1320 1321 1322

		flags &= ~VXLAN_GBP_USED_BITS;
	}

1323
	if (flags || vni & ~VXLAN_VNI_MASK) {
1324 1325 1326 1327
		/* If there are any unprocessed flags remaining treat
		 * this as a malformed packet. This behavior diverges from
		 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
		 * in reserved fields are to be ignored. The approach here
1328
		 * maintains compatibility with previous stack code, and also
1329 1330 1331 1332 1333 1334 1335
		 * is more robust and provides a little more security in
		 * adding extensions to VXLAN.
		 */

		goto bad_flags;
	}

1336
	vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
P
Pravin B Shelar 已提交
1337 1338 1339 1340 1341 1342 1343
	return 0;

drop:
	/* Consume bad packet */
	kfree_skb(skb);
	return 0;

1344 1345 1346 1347
bad_flags:
	netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
		   ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));

P
Pravin B Shelar 已提交
1348
error:
T
Thomas Graf 已提交
1349 1350 1351
	if (tun_dst)
		dst_release((struct dst_entry *)tun_dst);

P
Pravin B Shelar 已提交
1352 1353 1354 1355
	/* Return non vxlan pkt */
	return 1;
}

D
David Stevens 已提交
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct arphdr *parp;
	u8 *arpptr, *sha;
	__be32 sip, tip;
	struct neighbour *n;

	if (dev->flags & IFF_NOARP)
		goto out;

	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
		dev->stats.tx_dropped++;
		goto out;
	}
	parp = arp_hdr(skb);

	if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
	     parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
	    parp->ar_pro != htons(ETH_P_IP) ||
	    parp->ar_op != htons(ARPOP_REQUEST) ||
	    parp->ar_hln != dev->addr_len ||
	    parp->ar_pln != 4)
		goto out;
	arpptr = (u8 *)parp + sizeof(struct arphdr);
	sha = arpptr;
	arpptr += dev->addr_len;	/* sha */
	memcpy(&sip, arpptr, sizeof(sip));
	arpptr += sizeof(sip);
	arpptr += dev->addr_len;	/* tha */
	memcpy(&tip, arpptr, sizeof(tip));

	if (ipv4_is_loopback(tip) ||
	    ipv4_is_multicast(tip))
		goto out;

	n = neigh_lookup(&arp_tbl, &tip, dev);

	if (n) {
		struct vxlan_fdb *f;
		struct sk_buff	*reply;

		if (!(n->nud_state & NUD_CONNECTED)) {
			neigh_release(n);
			goto out;
		}

		f = vxlan_find_mac(vxlan, n->ha);
C
Cong Wang 已提交
1404
		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
D
David Stevens 已提交
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414
			/* bridge-local neighbor */
			neigh_release(n);
			goto out;
		}

		reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
				n->ha, sha);

		neigh_release(n);

1415 1416 1417
		if (reply == NULL)
			goto out;

D
David Stevens 已提交
1418 1419 1420 1421 1422 1423 1424
		skb_reset_mac_header(reply);
		__skb_pull(reply, skb_network_offset(reply));
		reply->ip_summed = CHECKSUM_UNNECESSARY;
		reply->pkt_type = PACKET_HOST;

		if (netif_rx_ni(reply) == NET_RX_DROP)
			dev->stats.rx_dropped++;
C
Cong Wang 已提交
1425 1426 1427
	} else if (vxlan->flags & VXLAN_F_L3MISS) {
		union vxlan_addr ipa = {
			.sin.sin_addr.s_addr = tip,
1428
			.sin.sin_family = AF_INET,
C
Cong Wang 已提交
1429 1430 1431 1432
		};

		vxlan_ip_miss(dev, &ipa);
	}
D
David Stevens 已提交
1433 1434 1435 1436 1437
out:
	consume_skb(skb);
	return NETDEV_TX_OK;
}

C
Cong Wang 已提交
1438
#if IS_ENABLED(CONFIG_IPV6)
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
static struct sk_buff *vxlan_na_create(struct sk_buff *request,
	struct neighbour *n, bool isrouter)
{
	struct net_device *dev = request->dev;
	struct sk_buff *reply;
	struct nd_msg *ns, *na;
	struct ipv6hdr *pip6;
	u8 *daddr;
	int na_olen = 8; /* opt hdr + ETH_ALEN for target */
	int ns_olen;
	int i, len;

	if (dev == NULL)
		return NULL;

	len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
		sizeof(*na) + na_olen + dev->needed_tailroom;
	reply = alloc_skb(len, GFP_ATOMIC);
	if (reply == NULL)
		return NULL;

	reply->protocol = htons(ETH_P_IPV6);
	reply->dev = dev;
	skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
	skb_push(reply, sizeof(struct ethhdr));
	skb_set_mac_header(reply, 0);

	ns = (struct nd_msg *)skb_transport_header(request);

	daddr = eth_hdr(request)->h_source;
	ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
	for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
		if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
			daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
			break;
		}
	}

	/* Ethernet header */
	ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
	ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
	eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
	reply->protocol = htons(ETH_P_IPV6);

	skb_pull(reply, sizeof(struct ethhdr));
	skb_set_network_header(reply, 0);
	skb_put(reply, sizeof(struct ipv6hdr));

	/* IPv6 header */

	pip6 = ipv6_hdr(reply);
	memset(pip6, 0, sizeof(struct ipv6hdr));
	pip6->version = 6;
	pip6->priority = ipv6_hdr(request)->priority;
	pip6->nexthdr = IPPROTO_ICMPV6;
	pip6->hop_limit = 255;
	pip6->daddr = ipv6_hdr(request)->saddr;
	pip6->saddr = *(struct in6_addr *)n->primary_key;

	skb_pull(reply, sizeof(struct ipv6hdr));
	skb_set_transport_header(reply, 0);

	na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);

	/* Neighbor Advertisement */
	memset(na, 0, sizeof(*na)+na_olen);
	na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
	na->icmph.icmp6_router = isrouter;
	na->icmph.icmp6_override = 1;
	na->icmph.icmp6_solicited = 1;
	na->target = ns->target;
	ether_addr_copy(&na->opt[2], n->ha);
	na->opt[0] = ND_OPT_TARGET_LL_ADDR;
	na->opt[1] = na_olen >> 3;

	na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
		&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
		csum_partial(na, sizeof(*na)+na_olen, 0));

	pip6->payload_len = htons(sizeof(*na)+na_olen);

	skb_push(reply, sizeof(struct ipv6hdr));

	reply->ip_summed = CHECKSUM_UNNECESSARY;

	return reply;
}

C
Cong Wang 已提交
1527 1528 1529
static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
1530
	struct nd_msg *msg;
C
Cong Wang 已提交
1531 1532
	const struct ipv6hdr *iphdr;
	const struct in6_addr *saddr, *daddr;
1533 1534
	struct neighbour *n;
	struct inet6_dev *in6_dev;
C
Cong Wang 已提交
1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548

	in6_dev = __in6_dev_get(dev);
	if (!in6_dev)
		goto out;

	iphdr = ipv6_hdr(skb);
	saddr = &iphdr->saddr;
	daddr = &iphdr->daddr;

	msg = (struct nd_msg *)skb_transport_header(skb);
	if (msg->icmph.icmp6_code != 0 ||
	    msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
		goto out;

1549 1550 1551 1552 1553
	if (ipv6_addr_loopback(daddr) ||
	    ipv6_addr_is_multicast(&msg->target))
		goto out;

	n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
C
Cong Wang 已提交
1554 1555 1556

	if (n) {
		struct vxlan_fdb *f;
1557
		struct sk_buff *reply;
C
Cong Wang 已提交
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570

		if (!(n->nud_state & NUD_CONNECTED)) {
			neigh_release(n);
			goto out;
		}

		f = vxlan_find_mac(vxlan, n->ha);
		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
			/* bridge-local neighbor */
			neigh_release(n);
			goto out;
		}

1571 1572 1573
		reply = vxlan_na_create(skb, n,
					!!(f ? f->flags & NTF_ROUTER : 0));

C
Cong Wang 已提交
1574
		neigh_release(n);
1575 1576 1577 1578 1579 1580 1581

		if (reply == NULL)
			goto out;

		if (netif_rx_ni(reply) == NET_RX_DROP)
			dev->stats.rx_dropped++;

C
Cong Wang 已提交
1582
	} else if (vxlan->flags & VXLAN_F_L3MISS) {
1583 1584
		union vxlan_addr ipa = {
			.sin6.sin6_addr = msg->target,
1585
			.sin6.sin6_family = AF_INET6,
1586 1587
		};

C
Cong Wang 已提交
1588 1589 1590 1591 1592 1593 1594 1595 1596
		vxlan_ip_miss(dev, &ipa);
	}

out:
	consume_skb(skb);
	return NETDEV_TX_OK;
}
#endif

D
David Stevens 已提交
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct neighbour *n;

	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
		return false;

	n = NULL;
	switch (ntohs(eth_hdr(skb)->h_proto)) {
	case ETH_P_IP:
1608 1609 1610
	{
		struct iphdr *pip;

D
David Stevens 已提交
1611 1612 1613 1614
		if (!pskb_may_pull(skb, sizeof(struct iphdr)))
			return false;
		pip = ip_hdr(skb);
		n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
C
Cong Wang 已提交
1615 1616 1617
		if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
			union vxlan_addr ipa = {
				.sin.sin_addr.s_addr = pip->daddr,
1618
				.sin.sin_family = AF_INET,
C
Cong Wang 已提交
1619 1620 1621 1622 1623 1624
			};

			vxlan_ip_miss(dev, &ipa);
			return false;
		}

D
David Stevens 已提交
1625
		break;
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638
	}
#if IS_ENABLED(CONFIG_IPV6)
	case ETH_P_IPV6:
	{
		struct ipv6hdr *pip6;

		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
			return false;
		pip6 = ipv6_hdr(skb);
		n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
		if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
			union vxlan_addr ipa = {
				.sin6.sin6_addr = pip6->daddr,
1639
				.sin6.sin6_family = AF_INET6,
1640 1641 1642 1643 1644 1645 1646 1647 1648
			};

			vxlan_ip_miss(dev, &ipa);
			return false;
		}

		break;
	}
#endif
D
David Stevens 已提交
1649 1650 1651 1652 1653 1654 1655
	default:
		return false;
	}

	if (n) {
		bool diff;

1656
		diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
D
David Stevens 已提交
1657 1658 1659 1660 1661 1662 1663
		if (diff) {
			memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
				dev->addr_len);
			memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
		}
		neigh_release(n);
		return diff;
C
Cong Wang 已提交
1664 1665
	}

D
David Stevens 已提交
1666 1667 1668
	return false;
}

1669
static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
T
Thomas Graf 已提交
1670 1671 1672 1673
				struct vxlan_metadata *md)
{
	struct vxlanhdr_gbp *gbp;

1674 1675 1676
	if (!md->gbp)
		return;

T
Thomas Graf 已提交
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	gbp = (struct vxlanhdr_gbp *)vxh;
	vxh->vx_flags |= htonl(VXLAN_HF_GBP);

	if (md->gbp & VXLAN_GBP_DONT_LEARN)
		gbp->dont_learn = 1;

	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
		gbp->policy_applied = 1;

	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
}

C
Cong Wang 已提交
1689
#if IS_ENABLED(CONFIG_IPV6)
1690 1691
static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
			   struct sk_buff *skb,
C
Cong Wang 已提交
1692 1693
			   struct net_device *dev, struct in6_addr *saddr,
			   struct in6_addr *daddr, __u8 prio, __u8 ttl,
1694
			   __be16 src_port, __be16 dst_port, __be32 vni,
1695
			   struct vxlan_metadata *md, bool xnet, u32 vxflags)
C
Cong Wang 已提交
1696 1697 1698 1699
{
	struct vxlanhdr *vxh;
	int min_headroom;
	int err;
1700
	bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
T
Tom Herbert 已提交
1701 1702 1703
	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
	u16 hdrlen = sizeof(struct vxlanhdr);

1704
	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
T
Tom Herbert 已提交
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
	    skb->ip_summed == CHECKSUM_PARTIAL) {
		int csum_start = skb_checksum_start_offset(skb);

		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
		    (skb->csum_offset == offsetof(struct udphdr, check) ||
		     skb->csum_offset == offsetof(struct tcphdr, check))) {
			udp_sum = false;
			type |= SKB_GSO_TUNNEL_REMCSUM;
		}
	}
C
Cong Wang 已提交
1716

N
Nicolas Dichtel 已提交
1717
	skb_scrub_packet(skb, xnet);
1718

C
Cong Wang 已提交
1719 1720
	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
			+ VXLAN_HLEN + sizeof(struct ipv6hdr)
1721
			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
C
Cong Wang 已提交
1722 1723 1724

	/* Need space for new headers (invalidates iph ptr) */
	err = skb_cow_head(skb, min_headroom);
P
Pravin B Shelar 已提交
1725 1726 1727 1728
	if (unlikely(err)) {
		kfree_skb(skb);
		goto err;
	}
C
Cong Wang 已提交
1729

1730
	skb = vlan_hwaccel_push_inside(skb);
P
Pravin B Shelar 已提交
1731 1732 1733 1734
	if (WARN_ON(!skb)) {
		err = -ENOMEM;
		goto err;
	}
C
Cong Wang 已提交
1735

1736 1737 1738 1739 1740 1741
	skb = iptunnel_handle_offloads(skb, udp_sum, type);
	if (IS_ERR(skb)) {
		err = -EINVAL;
		goto err;
	}

C
Cong Wang 已提交
1742
	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1743
	vxh->vx_flags = htonl(VXLAN_HF_VNI);
1744
	vxh->vx_vni = vni;
C
Cong Wang 已提交
1745

T
Tom Herbert 已提交
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	if (type & SKB_GSO_TUNNEL_REMCSUM) {
		u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
			   VXLAN_RCO_SHIFT;

		if (skb->csum_offset == offsetof(struct udphdr, check))
			data |= VXLAN_RCO_UDP;

		vxh->vx_vni |= htonl(data);
		vxh->vx_flags |= htonl(VXLAN_HF_RCO);

		if (!skb_is_gso(skb)) {
			skb->ip_summed = CHECKSUM_NONE;
			skb->encapsulation = 0;
		}
	}

1762 1763
	if (vxflags & VXLAN_F_GBP)
		vxlan_build_gbp_hdr(vxh, vxflags, md);
T
Thomas Graf 已提交
1764

1765 1766
	skb_set_inner_protocol(skb, htons(ETH_P_TEB));

1767
	udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1768
			     ttl, src_port, dst_port,
1769
			     !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
C
Cong Wang 已提交
1770
	return 0;
P
Pravin B Shelar 已提交
1771 1772 1773
err:
	dst_release(dst);
	return err;
C
Cong Wang 已提交
1774 1775 1776
}
#endif

1777 1778
static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
			  __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1779
			  __be16 src_port, __be16 dst_port, __be32 vni,
1780
			  struct vxlan_metadata *md, bool xnet, u32 vxflags)
1781 1782
{
	struct vxlanhdr *vxh;
1783
	int min_headroom;
1784
	int err;
1785
	bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
T
Tom Herbert 已提交
1786 1787 1788
	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
	u16 hdrlen = sizeof(struct vxlanhdr);

1789
	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
T
Tom Herbert 已提交
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
	    skb->ip_summed == CHECKSUM_PARTIAL) {
		int csum_start = skb_checksum_start_offset(skb);

		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
		    (skb->csum_offset == offsetof(struct udphdr, check) ||
		     skb->csum_offset == offsetof(struct tcphdr, check))) {
			udp_sum = false;
			type |= SKB_GSO_TUNNEL_REMCSUM;
		}
	}
1801

1802
	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1803
			+ VXLAN_HLEN + sizeof(struct iphdr)
1804
			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1805 1806 1807

	/* Need space for new headers (invalidates iph ptr) */
	err = skb_cow_head(skb, min_headroom);
P
Pravin B Shelar 已提交
1808 1809
	if (unlikely(err)) {
		kfree_skb(skb);
1810
		return err;
P
Pravin B Shelar 已提交
1811
	}
1812

1813 1814 1815
	skb = vlan_hwaccel_push_inside(skb);
	if (WARN_ON(!skb))
		return -ENOMEM;
1816

1817 1818 1819 1820
	skb = iptunnel_handle_offloads(skb, udp_sum, type);
	if (IS_ERR(skb))
		return PTR_ERR(skb);

1821
	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1822
	vxh->vx_flags = htonl(VXLAN_HF_VNI);
1823
	vxh->vx_vni = vni;
1824

T
Tom Herbert 已提交
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840
	if (type & SKB_GSO_TUNNEL_REMCSUM) {
		u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
			   VXLAN_RCO_SHIFT;

		if (skb->csum_offset == offsetof(struct udphdr, check))
			data |= VXLAN_RCO_UDP;

		vxh->vx_vni |= htonl(data);
		vxh->vx_flags |= htonl(VXLAN_HF_RCO);

		if (!skb_is_gso(skb)) {
			skb->ip_summed = CHECKSUM_NONE;
			skb->encapsulation = 0;
		}
	}

1841 1842
	if (vxflags & VXLAN_F_GBP)
		vxlan_build_gbp_hdr(vxh, vxflags, md);
T
Thomas Graf 已提交
1843

1844 1845
	skb_set_inner_protocol(skb, htons(ETH_P_TEB));

1846 1847 1848 1849
	udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
			    src_port, dst_port, xnet,
			    !(vxflags & VXLAN_F_UDP_CSUM));
	return 0;
1850 1851
}

1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
					  struct sk_buff *skb, int oif,
					  const struct in6_addr *daddr,
					  struct in6_addr *saddr)
{
	struct dst_entry *ndst;
	struct flowi6 fl6;
	int err;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_oif = oif;
	fl6.daddr = *daddr;
	fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
	fl6.flowi6_mark = skb->mark;
	fl6.flowi6_proto = IPPROTO_UDP;

	err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
					 vxlan->vn6_sock->sock->sk,
					 &ndst, &fl6);
	if (err < 0)
		return ERR_PTR(err);

	*saddr = fl6.saddr;
	return ndst;
}
#endif

1880 1881 1882 1883
/* Bypass encapsulation if the destination is local */
static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
			       struct vxlan_dev *dst_vxlan)
{
1884
	struct pcpu_sw_netstats *tx_stats, *rx_stats;
C
Cong Wang 已提交
1885 1886
	union vxlan_addr loopback;
	union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1887 1888
	struct net_device *dev = skb->dev;
	int len = skb->len;
1889

1890 1891
	tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
	rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1892 1893 1894 1895 1896
	skb->pkt_type = PACKET_HOST;
	skb->encapsulation = 0;
	skb->dev = dst_vxlan->dev;
	__skb_pull(skb, skb_network_offset(skb));

C
Cong Wang 已提交
1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	if (remote_ip->sa.sa_family == AF_INET) {
		loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
		loopback.sa.sa_family =  AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
	} else {
		loopback.sin6.sin6_addr = in6addr_loopback;
		loopback.sa.sa_family =  AF_INET6;
#endif
	}

1907
	if (dst_vxlan->flags & VXLAN_F_LEARN)
C
Cong Wang 已提交
1908
		vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1909 1910 1911

	u64_stats_update_begin(&tx_stats->syncp);
	tx_stats->tx_packets++;
1912
	tx_stats->tx_bytes += len;
1913 1914 1915 1916 1917
	u64_stats_update_end(&tx_stats->syncp);

	if (netif_rx(skb) == NET_RX_SUCCESS) {
		u64_stats_update_begin(&rx_stats->syncp);
		rx_stats->rx_packets++;
1918
		rx_stats->rx_bytes += len;
1919 1920
		u64_stats_update_end(&rx_stats->syncp);
	} else {
1921
		dev->stats.rx_dropped++;
1922 1923 1924
	}
}

1925 1926
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
			   struct vxlan_rdst *rdst, bool did_rsc)
S
stephen hemminger 已提交
1927
{
1928
	struct ip_tunnel_info *info;
S
stephen hemminger 已提交
1929
	struct vxlan_dev *vxlan = netdev_priv(dev);
1930
	struct sock *sk;
C
Cong Wang 已提交
1931
	struct rtable *rt = NULL;
S
stephen hemminger 已提交
1932 1933
	const struct iphdr *old_iph;
	struct flowi4 fl4;
C
Cong Wang 已提交
1934
	union vxlan_addr *dst;
T
Thomas Graf 已提交
1935 1936 1937
	union vxlan_addr remote_ip;
	struct vxlan_metadata _md;
	struct vxlan_metadata *md = &_md;
C
Cong Wang 已提交
1938
	__be16 src_port = 0, dst_port;
S
Stephen Hemminger 已提交
1939
	u32 vni;
S
stephen hemminger 已提交
1940 1941
	__be16 df = 0;
	__u8 tos, ttl;
1942
	int err;
T
Thomas Graf 已提交
1943
	u32 flags = vxlan->flags;
S
stephen hemminger 已提交
1944

1945
	info = skb_tunnel_info(skb);
1946

T
Thomas Graf 已提交
1947
	if (rdst) {
1948
		dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
T
Thomas Graf 已提交
1949 1950 1951 1952 1953 1954 1955 1956
		vni = rdst->remote_vni;
		dst = &rdst->remote_ip;
	} else {
		if (!info) {
			WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
				  dev->name);
			goto drop;
		}
1957
		dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
T
Thomas Graf 已提交
1958
		vni = be64_to_cpu(info->key.tun_id);
1959 1960
		remote_ip.sa.sa_family = ip_tunnel_info_af(info);
		if (remote_ip.sa.sa_family == AF_INET)
1961 1962 1963
			remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
		else
			remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
T
Thomas Graf 已提交
1964 1965
		dst = &remote_ip;
	}
D
David Stevens 已提交
1966

C
Cong Wang 已提交
1967
	if (vxlan_addr_any(dst)) {
D
David Stevens 已提交
1968 1969
		if (did_rsc) {
			/* short-circuited back to local bridge */
1970
			vxlan_encap_bypass(skb, vxlan, vxlan);
1971
			return;
D
David Stevens 已提交
1972
		}
1973
		goto drop;
D
David Stevens 已提交
1974
	}
1975

S
stephen hemminger 已提交
1976 1977
	old_iph = ip_hdr(skb);

1978
	ttl = vxlan->cfg.ttl;
C
Cong Wang 已提交
1979
	if (!ttl && vxlan_addr_multicast(dst))
S
stephen hemminger 已提交
1980 1981
		ttl = 1;

1982
	tos = vxlan->cfg.tos;
S
stephen hemminger 已提交
1983
	if (tos == 1)
1984
		tos = ip_tunnel_get_dsfield(old_iph, skb);
S
stephen hemminger 已提交
1985

1986 1987
	src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
				     vxlan->cfg.port_max, true);
S
stephen hemminger 已提交
1988

1989 1990 1991 1992 1993
	if (info) {
		ttl = info->key.ttl;
		tos = info->key.tos;

		if (info->options_len)
1994
			md = ip_tunnel_info_opts(info);
1995 1996 1997 1998
	} else {
		md->gbp = skb->mark;
	}

C
Cong Wang 已提交
1999
	if (dst->sa.sa_family == AF_INET) {
2000 2001 2002 2003
		if (!vxlan->vn4_sock)
			goto drop;
		sk = vxlan->vn4_sock->sock->sk;

2004 2005 2006 2007 2008 2009 2010 2011 2012
		if (info) {
			if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
				df = htons(IP_DF);

			if (info->key.tun_flags & TUNNEL_CSUM)
				flags |= VXLAN_F_UDP_CSUM;
			else
				flags &= ~VXLAN_F_UDP_CSUM;
		}
T
Thomas Graf 已提交
2013

C
Cong Wang 已提交
2014
		memset(&fl4, 0, sizeof(fl4));
T
Thomas Graf 已提交
2015
		fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
C
Cong Wang 已提交
2016
		fl4.flowi4_tos = RT_TOS(tos);
2017 2018
		fl4.flowi4_mark = skb->mark;
		fl4.flowi4_proto = IPPROTO_UDP;
C
Cong Wang 已提交
2019
		fl4.daddr = dst->sin.sin_addr.s_addr;
2020
		fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
C
Cong Wang 已提交
2021

N
Nicolas Dichtel 已提交
2022
		rt = ip_route_output_key(vxlan->net, &fl4);
C
Cong Wang 已提交
2023 2024 2025 2026 2027 2028
		if (IS_ERR(rt)) {
			netdev_dbg(dev, "no route to %pI4\n",
				   &dst->sin.sin_addr.s_addr);
			dev->stats.tx_carrier_errors++;
			goto tx_error;
		}
S
stephen hemminger 已提交
2029

C
Cong Wang 已提交
2030 2031 2032 2033
		if (rt->dst.dev == dev) {
			netdev_dbg(dev, "circular route to %pI4\n",
				   &dst->sin.sin_addr.s_addr);
			dev->stats.collisions++;
2034
			goto rt_tx_error;
C
Cong Wang 已提交
2035 2036 2037 2038 2039 2040 2041 2042
		}

		/* Bypass encapsulation if the destination is local */
		if (rt->rt_flags & RTCF_LOCAL &&
		    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
			struct vxlan_dev *dst_vxlan;

			ip_rt_put(rt);
2043
			dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2044 2045
						   dst->sa.sa_family, dst_port,
						   vxlan->flags);
C
Cong Wang 已提交
2046 2047 2048 2049 2050 2051 2052 2053
			if (!dst_vxlan)
				goto tx_error;
			vxlan_encap_bypass(skb, vxlan, dst_vxlan);
			return;
		}

		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2054
		err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2055
				     dst->sin.sin_addr.s_addr, tos, ttl, df,
2056
				     src_port, dst_port, htonl(vni << 8), md,
2057
				     !net_eq(vxlan->net, dev_net(vxlan->dev)),
T
Thomas Graf 已提交
2058
				     flags);
P
Pravin B Shelar 已提交
2059 2060 2061
		if (err < 0) {
			/* skb is already freed. */
			skb = NULL;
C
Cong Wang 已提交
2062
			goto rt_tx_error;
P
Pravin B Shelar 已提交
2063
		}
C
Cong Wang 已提交
2064 2065 2066
#if IS_ENABLED(CONFIG_IPV6)
	} else {
		struct dst_entry *ndst;
2067
		struct in6_addr saddr;
J
Jiri Benc 已提交
2068
		u32 rt6i_flags;
C
Cong Wang 已提交
2069

2070 2071 2072 2073
		if (!vxlan->vn6_sock)
			goto drop;
		sk = vxlan->vn6_sock->sock->sk;

2074 2075 2076 2077
		ndst = vxlan6_get_route(vxlan, skb,
					rdst ? rdst->remote_ifindex : 0,
					&dst->sin6.sin6_addr, &saddr);
		if (IS_ERR(ndst)) {
C
Cong Wang 已提交
2078 2079 2080
			netdev_dbg(dev, "no route to %pI6\n",
				   &dst->sin6.sin6_addr);
			dev->stats.tx_carrier_errors++;
2081
			goto tx_error;
C
Cong Wang 已提交
2082
		}
S
stephen hemminger 已提交
2083

C
Cong Wang 已提交
2084 2085 2086 2087 2088 2089 2090
		if (ndst->dev == dev) {
			netdev_dbg(dev, "circular route to %pI6\n",
				   &dst->sin6.sin6_addr);
			dst_release(ndst);
			dev->stats.collisions++;
			goto tx_error;
		}
2091

C
Cong Wang 已提交
2092
		/* Bypass encapsulation if the destination is local */
J
Jiri Benc 已提交
2093 2094 2095
		rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
		if (rt6i_flags & RTF_LOCAL &&
		    !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
C
Cong Wang 已提交
2096 2097 2098
			struct vxlan_dev *dst_vxlan;

			dst_release(ndst);
2099
			dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2100 2101
						   dst->sa.sa_family, dst_port,
						   vxlan->flags);
C
Cong Wang 已提交
2102 2103 2104 2105 2106
			if (!dst_vxlan)
				goto tx_error;
			vxlan_encap_bypass(skb, vxlan, dst_vxlan);
			return;
		}
2107

2108 2109 2110 2111 2112 2113 2114
		if (info) {
			if (info->key.tun_flags & TUNNEL_CSUM)
				flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
			else
				flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
		}

C
Cong Wang 已提交
2115
		ttl = ttl ? : ip6_dst_hoplimit(ndst);
2116
		err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2117
				      0, ttl, src_port, dst_port, htonl(vni << 8), md,
2118
				      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2119
				      flags);
C
Cong Wang 已提交
2120 2121
#endif
	}
2122

2123
	return;
S
stephen hemminger 已提交
2124 2125 2126 2127 2128

drop:
	dev->stats.tx_dropped++;
	goto tx_free;

2129 2130
rt_tx_error:
	ip_rt_put(rt);
S
stephen hemminger 已提交
2131 2132 2133 2134 2135 2136
tx_error:
	dev->stats.tx_errors++;
tx_free:
	dev_kfree_skb(skb);
}

2137 2138 2139 2140 2141 2142 2143 2144 2145
/* Transmit local packets over Vxlan
 *
 * Outer IP header inherits ECN and DF from inner header.
 * Outer UDP destination is the VXLAN assigned port.
 *           source port is based on hash of flow
 */
static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
2146
	const struct ip_tunnel_info *info;
2147 2148
	struct ethhdr *eth;
	bool did_rsc = false;
2149
	struct vxlan_rdst *rdst, *fdst = NULL;
2150 2151
	struct vxlan_fdb *f;

2152
	info = skb_tunnel_info(skb);
2153

2154 2155 2156
	skb_reset_mac_header(skb);
	eth = eth_hdr(skb);

C
Cong Wang 已提交
2157 2158 2159 2160 2161
	if ((vxlan->flags & VXLAN_F_PROXY)) {
		if (ntohs(eth->h_proto) == ETH_P_ARP)
			return arp_reduce(dev, skb);
#if IS_ENABLED(CONFIG_IPV6)
		else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2162 2163
			 pskb_may_pull(skb, sizeof(struct ipv6hdr)
				       + sizeof(struct nd_msg)) &&
C
Cong Wang 已提交
2164 2165 2166 2167 2168 2169 2170 2171
			 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
				struct nd_msg *msg;

				msg = (struct nd_msg *)skb_transport_header(skb);
				if (msg->icmph.icmp6_code == 0 &&
				    msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
					return neigh_reduce(dev, skb);
		}
L
Li RongQing 已提交
2172
		eth = eth_hdr(skb);
C
Cong Wang 已提交
2173 2174
#endif
	}
2175

2176 2177 2178 2179 2180
	if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
		if (info && info->mode & IP_TUNNEL_INFO_TX)
			vxlan_xmit_one(skb, dev, NULL, false);
		else
			kfree_skb(skb);
T
Thomas Graf 已提交
2181 2182 2183
		return NETDEV_TX_OK;
	}

2184
	f = vxlan_find_mac(vxlan, eth->h_dest);
2185 2186 2187
	did_rsc = false;

	if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2188 2189
	    (ntohs(eth->h_proto) == ETH_P_IP ||
	     ntohs(eth->h_proto) == ETH_P_IPV6)) {
2190 2191 2192 2193 2194
		did_rsc = route_shortcircuit(dev, skb);
		if (did_rsc)
			f = vxlan_find_mac(vxlan, eth->h_dest);
	}

2195
	if (f == NULL) {
2196 2197 2198 2199 2200 2201 2202
		f = vxlan_find_mac(vxlan, all_zeros_mac);
		if (f == NULL) {
			if ((vxlan->flags & VXLAN_F_L2MISS) &&
			    !is_multicast_ether_addr(eth->h_dest))
				vxlan_fdb_miss(vxlan, eth->h_dest);

			dev->stats.tx_dropped++;
2203
			kfree_skb(skb);
2204 2205 2206
			return NETDEV_TX_OK;
		}
	}
2207

2208 2209
	list_for_each_entry_rcu(rdst, &f->remotes, list) {
		struct sk_buff *skb1;
2210

2211 2212 2213 2214
		if (!fdst) {
			fdst = rdst;
			continue;
		}
2215 2216 2217
		skb1 = skb_clone(skb, GFP_ATOMIC);
		if (skb1)
			vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2218 2219
	}

2220 2221 2222 2223
	if (fdst)
		vxlan_xmit_one(skb, dev, fdst, did_rsc);
	else
		kfree_skb(skb);
2224
	return NETDEV_TX_OK;
2225 2226
}

S
stephen hemminger 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238
/* Walk the forwarding table and purge stale entries */
static void vxlan_cleanup(unsigned long arg)
{
	struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
	unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
	unsigned int h;

	if (!netif_running(vxlan->dev))
		return;

	for (h = 0; h < FDB_HASH_SIZE; ++h) {
		struct hlist_node *p, *n;
2239 2240

		spin_lock_bh(&vxlan->hash_lock);
S
stephen hemminger 已提交
2241 2242 2243 2244 2245
		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
			struct vxlan_fdb *f
				= container_of(p, struct vxlan_fdb, hlist);
			unsigned long timeout;

2246
			if (f->state & NUD_PERMANENT)
S
stephen hemminger 已提交
2247 2248
				continue;

2249
			timeout = f->used + vxlan->cfg.age_interval * HZ;
S
stephen hemminger 已提交
2250 2251 2252 2253 2254 2255 2256 2257 2258
			if (time_before_eq(timeout, jiffies)) {
				netdev_dbg(vxlan->dev,
					   "garbage collect %pM\n",
					   f->eth_addr);
				f->state = NUD_STALE;
				vxlan_fdb_destroy(vxlan, f);
			} else if (time_before(timeout, next_timer))
				next_timer = timeout;
		}
2259
		spin_unlock_bh(&vxlan->hash_lock);
S
stephen hemminger 已提交
2260 2261 2262 2263 2264
	}

	mod_timer(&vxlan->age_timer, next_timer);
}

2265 2266
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
{
2267
	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2268 2269
	__u32 vni = vxlan->default_dst.remote_vni;

2270
	spin_lock(&vn->sock_lock);
2271
	hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2272
	spin_unlock(&vn->sock_lock);
2273 2274
}

S
stephen hemminger 已提交
2275 2276 2277
/* Setup stats when device is created */
static int vxlan_init(struct net_device *dev)
{
2278
	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2279
	if (!dev->tstats)
S
stephen hemminger 已提交
2280 2281 2282 2283 2284
		return -ENOMEM;

	return 0;
}

2285
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295
{
	struct vxlan_fdb *f;

	spin_lock_bh(&vxlan->hash_lock);
	f = __vxlan_find_mac(vxlan, all_zeros_mac);
	if (f)
		vxlan_fdb_destroy(vxlan, f);
	spin_unlock_bh(&vxlan->hash_lock);
}

2296 2297 2298 2299
static void vxlan_uninit(struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);

2300
	vxlan_fdb_delete_default(vxlan);
2301

2302 2303 2304
	free_percpu(dev->tstats);
}

S
stephen hemminger 已提交
2305 2306 2307 2308
/* Start ageing timer and join group when device is brought up */
static int vxlan_open(struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
2309
	int ret;
2310

2311 2312 2313
	ret = vxlan_sock_add(vxlan);
	if (ret < 0)
		return ret;
S
stephen hemminger 已提交
2314

2315
	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2316
		ret = vxlan_igmp_join(vxlan);
2317 2318
		if (ret == -EADDRINUSE)
			ret = 0;
2319
		if (ret) {
2320
			vxlan_sock_release(vxlan);
2321 2322
			return ret;
		}
S
stephen hemminger 已提交
2323 2324
	}

2325
	if (vxlan->cfg.age_interval)
S
stephen hemminger 已提交
2326 2327
		mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);

2328
	return ret;
S
stephen hemminger 已提交
2329 2330 2331 2332 2333
}

/* Purge the forwarding table */
static void vxlan_flush(struct vxlan_dev *vxlan)
{
2334
	unsigned int h;
S
stephen hemminger 已提交
2335 2336 2337 2338 2339 2340 2341

	spin_lock_bh(&vxlan->hash_lock);
	for (h = 0; h < FDB_HASH_SIZE; ++h) {
		struct hlist_node *p, *n;
		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
			struct vxlan_fdb *f
				= container_of(p, struct vxlan_fdb, hlist);
2342 2343 2344
			/* the all_zeros_mac entry is deleted at vxlan_uninit */
			if (!is_zero_ether_addr(f->eth_addr))
				vxlan_fdb_destroy(vxlan, f);
S
stephen hemminger 已提交
2345 2346 2347 2348 2349 2350 2351 2352 2353
		}
	}
	spin_unlock_bh(&vxlan->hash_lock);
}

/* Cleanup timer and forwarding table on shutdown */
static int vxlan_stop(struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
N
Nicolas Dichtel 已提交
2354
	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2355
	int ret = 0;
S
stephen hemminger 已提交
2356

2357
	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2358
	    !vxlan_group_used(vn, vxlan))
2359
		ret = vxlan_igmp_leave(vxlan);
S
stephen hemminger 已提交
2360 2361 2362 2363

	del_timer_sync(&vxlan->age_timer);

	vxlan_flush(vxlan);
2364
	vxlan_sock_release(vxlan);
S
stephen hemminger 已提交
2365

2366
	return ret;
S
stephen hemminger 已提交
2367 2368 2369 2370 2371 2372 2373
}

/* Stub, nothing needs to be done. */
static void vxlan_set_multicast_list(struct net_device *dev)
{
}

D
David Wragg 已提交
2374 2375 2376
static int __vxlan_change_mtu(struct net_device *dev,
			      struct net_device *lowerdev,
			      struct vxlan_rdst *dst, int new_mtu, bool strict)
2377
{
D
David Wragg 已提交
2378
	int max_mtu = IP_MAX_MTU;
2379

D
David Wragg 已提交
2380 2381
	if (lowerdev)
		max_mtu = lowerdev->mtu;
2382 2383

	if (dst->remote_ip.sa.sa_family == AF_INET6)
D
David Wragg 已提交
2384
		max_mtu -= VXLAN6_HEADROOM;
2385
	else
D
David Wragg 已提交
2386
		max_mtu -= VXLAN_HEADROOM;
2387

D
David Wragg 已提交
2388
	if (new_mtu < 68)
2389 2390
		return -EINVAL;

D
David Wragg 已提交
2391 2392 2393 2394 2395 2396 2397
	if (new_mtu > max_mtu) {
		if (strict)
			return -EINVAL;

		new_mtu = max_mtu;
	}

2398 2399 2400 2401
	dev->mtu = new_mtu;
	return 0;
}

D
David Wragg 已提交
2402 2403 2404 2405 2406 2407 2408 2409 2410
static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct vxlan_rdst *dst = &vxlan->default_dst;
	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
							 dst->remote_ifindex);
	return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
}

2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445
static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
				struct ip_tunnel_info *info,
				__be16 sport, __be16 dport)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct rtable *rt;
	struct flowi4 fl4;

	memset(&fl4, 0, sizeof(fl4));
	fl4.flowi4_tos = RT_TOS(info->key.tos);
	fl4.flowi4_mark = skb->mark;
	fl4.flowi4_proto = IPPROTO_UDP;
	fl4.daddr = info->key.u.ipv4.dst;

	rt = ip_route_output_key(vxlan->net, &fl4);
	if (IS_ERR(rt))
		return PTR_ERR(rt);
	ip_rt_put(rt);

	info->key.u.ipv4.src = fl4.saddr;
	info->key.tp_src = sport;
	info->key.tp_dst = dport;
	return 0;
}

static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
	struct ip_tunnel_info *info = skb_tunnel_info(skb);
	__be16 sport, dport;

	sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
				  vxlan->cfg.port_max, true);
	dport = info->key.tp_dst ? : vxlan->cfg.dst_port;

2446 2447 2448
	if (ip_tunnel_info_af(info) == AF_INET) {
		if (!vxlan->vn4_sock)
			return -EINVAL;
2449
		return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469
	} else {
#if IS_ENABLED(CONFIG_IPV6)
		struct dst_entry *ndst;

		if (!vxlan->vn6_sock)
			return -EINVAL;
		ndst = vxlan6_get_route(vxlan, skb, 0,
					&info->key.u.ipv6.dst,
					&info->key.u.ipv6.src);
		if (IS_ERR(ndst))
			return PTR_ERR(ndst);
		dst_release(ndst);

		info->key.tp_src = sport;
		info->key.tp_dst = dport;
#else /* !CONFIG_IPV6 */
		return -EPFNOSUPPORT;
#endif
	}
	return 0;
2470 2471
}

S
stephen hemminger 已提交
2472 2473
static const struct net_device_ops vxlan_netdev_ops = {
	.ndo_init		= vxlan_init,
2474
	.ndo_uninit		= vxlan_uninit,
S
stephen hemminger 已提交
2475 2476 2477
	.ndo_open		= vxlan_open,
	.ndo_stop		= vxlan_stop,
	.ndo_start_xmit		= vxlan_xmit,
2478
	.ndo_get_stats64	= ip_tunnel_get_stats64,
S
stephen hemminger 已提交
2479
	.ndo_set_rx_mode	= vxlan_set_multicast_list,
2480
	.ndo_change_mtu		= vxlan_change_mtu,
S
stephen hemminger 已提交
2481 2482 2483 2484 2485
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_fdb_add		= vxlan_fdb_add,
	.ndo_fdb_del		= vxlan_fdb_delete,
	.ndo_fdb_dump		= vxlan_fdb_dump,
2486
	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
S
stephen hemminger 已提交
2487 2488 2489 2490 2491 2492 2493
};

/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type vxlan_type = {
	.name = "vxlan",
};

2494
/* Calls the ndo_add_vxlan_port of the caller in order to
J
Joseph Gasparakis 已提交
2495 2496
 * supply the listening VXLAN udp ports. Callers are expected
 * to implement the ndo_add_vxlan_port.
2497 2498 2499 2500 2501 2502 2503
 */
void vxlan_get_rx_port(struct net_device *dev)
{
	struct vxlan_sock *vs;
	struct net *net = dev_net(dev);
	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
	sa_family_t sa_family;
J
Joseph Gasparakis 已提交
2504 2505
	__be16 port;
	unsigned int i;
2506 2507 2508

	spin_lock(&vn->sock_lock);
	for (i = 0; i < PORT_HASH_SIZE; ++i) {
J
Joseph Gasparakis 已提交
2509 2510
		hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
			port = inet_sk(vs->sock->sk)->inet_sport;
2511
			sa_family = vxlan_get_sk_family(vs);
2512 2513 2514 2515 2516 2517 2518 2519
			dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
							    port);
		}
	}
	spin_unlock(&vn->sock_lock);
}
EXPORT_SYMBOL_GPL(vxlan_get_rx_port);

S
stephen hemminger 已提交
2520 2521 2522 2523
/* Initialize the device structure. */
static void vxlan_setup(struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
2524
	unsigned int h;
S
stephen hemminger 已提交
2525 2526 2527 2528 2529

	eth_hw_addr_random(dev);
	ether_setup(dev);

	dev->netdev_ops = &vxlan_netdev_ops;
2530
	dev->destructor = free_netdev;
S
stephen hemminger 已提交
2531 2532 2533
	SET_NETDEV_DEVTYPE(dev, &vxlan_type);

	dev->features	|= NETIF_F_LLTX;
2534
	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM;
2535
	dev->features   |= NETIF_F_RXCSUM;
2536
	dev->features   |= NETIF_F_GSO_SOFTWARE;
2537

2538 2539
	dev->vlan_features = dev->features;
	dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2540
	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2541
	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2542
	dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2543
	netif_keep_dst(dev);
J
Jiri Benc 已提交
2544
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2545
	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
S
stephen hemminger 已提交
2546

2547
	INIT_LIST_HEAD(&vxlan->next);
S
stephen hemminger 已提交
2548 2549 2550 2551 2552 2553
	spin_lock_init(&vxlan->hash_lock);

	init_timer_deferrable(&vxlan->age_timer);
	vxlan->age_timer.function = vxlan_cleanup;
	vxlan->age_timer.data = (unsigned long) vxlan;

2554
	vxlan->cfg.dst_port = htons(vxlan_port);
2555

S
stephen hemminger 已提交
2556 2557
	vxlan->dev = dev;

T
Tom Herbert 已提交
2558 2559
	gro_cells_init(&vxlan->gro_cells, dev);

S
stephen hemminger 已提交
2560 2561 2562 2563 2564 2565
	for (h = 0; h < FDB_HASH_SIZE; ++h)
		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
}

static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
2566
	[IFLA_VXLAN_GROUP]	= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
C
Cong Wang 已提交
2567
	[IFLA_VXLAN_GROUP6]	= { .len = sizeof(struct in6_addr) },
S
stephen hemminger 已提交
2568 2569
	[IFLA_VXLAN_LINK]	= { .type = NLA_U32 },
	[IFLA_VXLAN_LOCAL]	= { .len = FIELD_SIZEOF(struct iphdr, saddr) },
C
Cong Wang 已提交
2570
	[IFLA_VXLAN_LOCAL6]	= { .len = sizeof(struct in6_addr) },
S
stephen hemminger 已提交
2571 2572 2573 2574 2575
	[IFLA_VXLAN_TOS]	= { .type = NLA_U8 },
	[IFLA_VXLAN_TTL]	= { .type = NLA_U8 },
	[IFLA_VXLAN_LEARNING]	= { .type = NLA_U8 },
	[IFLA_VXLAN_AGEING]	= { .type = NLA_U32 },
	[IFLA_VXLAN_LIMIT]	= { .type = NLA_U32 },
2576
	[IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
D
David Stevens 已提交
2577 2578 2579 2580
	[IFLA_VXLAN_PROXY]	= { .type = NLA_U8 },
	[IFLA_VXLAN_RSC]	= { .type = NLA_U8 },
	[IFLA_VXLAN_L2MISS]	= { .type = NLA_U8 },
	[IFLA_VXLAN_L3MISS]	= { .type = NLA_U8 },
2581
	[IFLA_VXLAN_COLLECT_METADATA]	= { .type = NLA_U8 },
2582
	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
2583 2584 2585
	[IFLA_VXLAN_UDP_CSUM]	= { .type = NLA_U8 },
	[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
	[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
T
Tom Herbert 已提交
2586 2587
	[IFLA_VXLAN_REMCSUM_TX]	= { .type = NLA_U8 },
	[IFLA_VXLAN_REMCSUM_RX]	= { .type = NLA_U8 },
T
Thomas Graf 已提交
2588
	[IFLA_VXLAN_GBP]	= { .type = NLA_FLAG, },
2589
	[IFLA_VXLAN_REMCSUM_NOPARTIAL]	= { .type = NLA_FLAG },
S
stephen hemminger 已提交
2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614
};

static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
			pr_debug("invalid link address (not ethernet)\n");
			return -EINVAL;
		}

		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
			pr_debug("invalid all zero ethernet address\n");
			return -EADDRNOTAVAIL;
		}
	}

	if (!data)
		return -EINVAL;

	if (data[IFLA_VXLAN_ID]) {
		__u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
		if (id >= VXLAN_VID_MASK)
			return -ERANGE;
	}

2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625
	if (data[IFLA_VXLAN_PORT_RANGE]) {
		const struct ifla_vxlan_port_range *p
			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);

		if (ntohs(p->high) < ntohs(p->low)) {
			pr_debug("port range %u .. %u not valid\n",
				 ntohs(p->low), ntohs(p->high));
			return -EINVAL;
		}
	}

S
stephen hemminger 已提交
2626 2627 2628
	return 0;
}

Y
Yan Burman 已提交
2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640
static void vxlan_get_drvinfo(struct net_device *netdev,
			      struct ethtool_drvinfo *drvinfo)
{
	strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
	strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
}

static const struct ethtool_ops vxlan_ethtool_ops = {
	.get_drvinfo	= vxlan_get_drvinfo,
	.get_link	= ethtool_op_get_link,
};

2641 2642 2643
static void vxlan_del_work(struct work_struct *work)
{
	struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2644
	udp_tunnel_sock_release(vs->sock);
2645 2646 2647
	kfree_rcu(vs, rcu);
}

T
Tom Herbert 已提交
2648 2649
static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
					__be16 port, u32 flags)
2650
{
C
Cong Wang 已提交
2651
	struct socket *sock;
T
Tom Herbert 已提交
2652 2653
	struct udp_port_cfg udp_conf;
	int err;
C
Cong Wang 已提交
2654

T
Tom Herbert 已提交
2655
	memset(&udp_conf, 0, sizeof(udp_conf));
C
Cong Wang 已提交
2656

T
Tom Herbert 已提交
2657 2658 2659
	if (ipv6) {
		udp_conf.family = AF_INET6;
		udp_conf.use_udp6_rx_checksums =
2660
		    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2661
		udp_conf.ipv6_v6only = 1;
T
Tom Herbert 已提交
2662 2663
	} else {
		udp_conf.family = AF_INET;
C
Cong Wang 已提交
2664 2665
	}

T
Tom Herbert 已提交
2666
	udp_conf.local_udp_port = port;
2667

T
Tom Herbert 已提交
2668 2669 2670 2671
	/* Open UDP socket */
	err = udp_sock_create(net, &udp_conf, &sock);
	if (err < 0)
		return ERR_PTR(err);
C
Cong Wang 已提交
2672

Z
Zhi Yong Wu 已提交
2673
	return sock;
C
Cong Wang 已提交
2674 2675 2676
}

/* Create new listen socket if needed */
2677 2678
static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
					      __be16 port, u32 flags)
C
Cong Wang 已提交
2679 2680 2681 2682 2683
{
	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
	struct vxlan_sock *vs;
	struct socket *sock;
	unsigned int h;
2684
	struct udp_tunnel_sock_cfg tunnel_cfg;
C
Cong Wang 已提交
2685

2686
	vs = kzalloc(sizeof(*vs), GFP_KERNEL);
C
Cong Wang 已提交
2687 2688 2689 2690 2691 2692 2693 2694
	if (!vs)
		return ERR_PTR(-ENOMEM);

	for (h = 0; h < VNI_HASH_SIZE; ++h)
		INIT_HLIST_HEAD(&vs->vni_list[h]);

	INIT_WORK(&vs->del_work, vxlan_del_work);

T
Tom Herbert 已提交
2695
	sock = vxlan_create_sock(net, ipv6, port, flags);
Z
Zhi Yong Wu 已提交
2696
	if (IS_ERR(sock)) {
2697 2698
		pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
			PTR_ERR(sock));
2699
		kfree(vs);
2700
		return ERR_CAST(sock);
2701
	}
C
Cong Wang 已提交
2702 2703

	vs->sock = sock;
2704
	atomic_set(&vs->refcnt, 1);
2705
	vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2706

2707 2708 2709 2710 2711
	/* Initialize the vxlan udp offloads structure */
	vs->udp_offloads.port = port;
	vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
	vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;

2712 2713
	spin_lock(&vn->sock_lock);
	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2714
	vxlan_notify_add_rx_port(vs);
2715
	spin_unlock(&vn->sock_lock);
2716 2717

	/* Mark socket as an encapsulation socket. */
2718 2719 2720 2721 2722 2723
	tunnel_cfg.sk_user_data = vs;
	tunnel_cfg.encap_type = 1;
	tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
	tunnel_cfg.encap_destroy = NULL;

	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
C
Cong Wang 已提交
2724

2725 2726 2727
	return vs;
}

2728
static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2729
{
2730 2731
	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
	struct vxlan_sock *vs = NULL;
2732

2733
	if (!vxlan->cfg.no_share) {
2734
		spin_lock(&vn->sock_lock);
2735 2736 2737
		vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
				     vxlan->cfg.dst_port, vxlan->flags);
		if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2738
			spin_unlock(&vn->sock_lock);
2739
			return -EBUSY;
2740 2741 2742
		}
		spin_unlock(&vn->sock_lock);
	}
2743
	if (!vs)
2744 2745
		vs = vxlan_socket_create(vxlan->net, ipv6,
					 vxlan->cfg.dst_port, vxlan->flags);
2746 2747
	if (IS_ERR(vs))
		return PTR_ERR(vs);
2748 2749 2750 2751 2752 2753
#if IS_ENABLED(CONFIG_IPV6)
	if (ipv6)
		vxlan->vn6_sock = vs;
	else
#endif
		vxlan->vn4_sock = vs;
2754 2755
	vxlan_vs_add_dev(vs, vxlan);
	return 0;
2756 2757
}

2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776
static int vxlan_sock_add(struct vxlan_dev *vxlan)
{
	bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
	bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
	int ret = 0;

	vxlan->vn4_sock = NULL;
#if IS_ENABLED(CONFIG_IPV6)
	vxlan->vn6_sock = NULL;
	if (ipv6 || metadata)
		ret = __vxlan_sock_add(vxlan, true);
#endif
	if (!ret && (!ipv6 || metadata))
		ret = __vxlan_sock_add(vxlan, false);
	if (ret < 0)
		vxlan_sock_release(vxlan);
	return ret;
}

2777 2778
static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
			       struct vxlan_config *conf)
S
stephen hemminger 已提交
2779
{
2780
	struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2781
	struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2782
	struct vxlan_rdst *dst = &vxlan->default_dst;
2783
	unsigned short needed_headroom = ETH_HLEN;
S
stephen hemminger 已提交
2784
	int err;
C
Cong Wang 已提交
2785
	bool use_ipv6 = false;
2786
	__be16 default_port = vxlan->cfg.dst_port;
2787
	struct net_device *lowerdev = NULL;
S
stephen hemminger 已提交
2788

2789
	vxlan->net = src_net;
N
Nicolas Dichtel 已提交
2790

2791
	dst->remote_vni = conf->vni;
S
stephen hemminger 已提交
2792

2793
	memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
S
stephen hemminger 已提交
2794

2795 2796 2797
	/* Unless IPv6 is explicitly requested, assume IPv4 */
	if (!dst->remote_ip.sa.sa_family)
		dst->remote_ip.sa.sa_family = AF_INET;
C
Cong Wang 已提交
2798

2799
	if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2800 2801 2802
	    vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
		if (!IS_ENABLED(CONFIG_IPV6))
			return -EPFNOSUPPORT;
C
Cong Wang 已提交
2803
		use_ipv6 = true;
2804
		vxlan->flags |= VXLAN_F_IPV6;
2805
	}
S
stephen hemminger 已提交
2806

2807
	if (conf->remote_ifindex) {
2808
		lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2809
		dst->remote_ifindex = conf->remote_ifindex;
2810 2811

		if (!lowerdev) {
2812
			pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2813 2814
			return -ENODEV;
		}
S
stephen hemminger 已提交
2815

C
Cong Wang 已提交
2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
#if IS_ENABLED(CONFIG_IPV6)
		if (use_ipv6) {
			struct inet6_dev *idev = __in6_dev_get(lowerdev);
			if (idev && idev->cnf.disable_ipv6) {
				pr_info("IPv6 is disabled via sysctl\n");
				return -EPERM;
			}
		}
#endif

2826
		if (!conf->mtu)
C
Cong Wang 已提交
2827
			dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2828

2829
		needed_headroom = lowerdev->hard_header_len;
J
Jiri Benc 已提交
2830
	}
S
stephen hemminger 已提交
2831

2832 2833 2834 2835 2836 2837
	if (conf->mtu) {
		err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
		if (err)
			return err;
	}

2838 2839 2840 2841 2842 2843
	if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
		needed_headroom += VXLAN6_HEADROOM;
	else
		needed_headroom += VXLAN_HEADROOM;
	dev->needed_headroom = needed_headroom;

2844 2845 2846 2847 2848 2849 2850 2851
	memcpy(&vxlan->cfg, conf, sizeof(*conf));
	if (!vxlan->cfg.dst_port)
		vxlan->cfg.dst_port = default_port;
	vxlan->flags |= conf->flags;

	if (!vxlan->cfg.age_interval)
		vxlan->cfg.age_interval = FDB_AGE_DEFAULT;

2852 2853 2854 2855 2856 2857 2858
	list_for_each_entry(tmp, &vn->vxlan_list, next) {
		if (tmp->cfg.vni == conf->vni &&
		    (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
		     tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
		    tmp->cfg.dst_port == vxlan->cfg.dst_port &&
		    (tmp->flags & VXLAN_F_RCV_FLAGS) ==
		    (vxlan->flags & VXLAN_F_RCV_FLAGS))
2859
		return -EEXIST;
2860
	}
2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919

	dev->ethtool_ops = &vxlan_ethtool_ops;

	/* create an fdb entry for a valid default destination */
	if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
		err = vxlan_fdb_create(vxlan, all_zeros_mac,
				       &vxlan->default_dst.remote_ip,
				       NUD_REACHABLE|NUD_PERMANENT,
				       NLM_F_EXCL|NLM_F_CREATE,
				       vxlan->cfg.dst_port,
				       vxlan->default_dst.remote_vni,
				       vxlan->default_dst.remote_ifindex,
				       NTF_SELF);
		if (err)
			return err;
	}

	err = register_netdevice(dev);
	if (err) {
		vxlan_fdb_delete_default(vxlan);
		return err;
	}

	list_add(&vxlan->next, &vn->vxlan_list);

	return 0;
}

struct net_device *vxlan_dev_create(struct net *net, const char *name,
				    u8 name_assign_type, struct vxlan_config *conf)
{
	struct nlattr *tb[IFLA_MAX+1];
	struct net_device *dev;
	int err;

	memset(&tb, 0, sizeof(tb));

	dev = rtnl_create_link(net, name, name_assign_type,
			       &vxlan_link_ops, tb);
	if (IS_ERR(dev))
		return dev;

	err = vxlan_dev_configure(net, dev, conf);
	if (err < 0) {
		free_netdev(dev);
		return ERR_PTR(err);
	}

	return dev;
}
EXPORT_SYMBOL_GPL(vxlan_dev_create);

static int vxlan_newlink(struct net *src_net, struct net_device *dev,
			 struct nlattr *tb[], struct nlattr *data[])
{
	struct vxlan_config conf;
	int err;

	memset(&conf, 0, sizeof(conf));
2920 2921 2922

	if (data[IFLA_VXLAN_ID])
		conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948

	if (data[IFLA_VXLAN_GROUP]) {
		conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
	} else if (data[IFLA_VXLAN_GROUP6]) {
		if (!IS_ENABLED(CONFIG_IPV6))
			return -EPFNOSUPPORT;

		conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
		conf.remote_ip.sa.sa_family = AF_INET6;
	}

	if (data[IFLA_VXLAN_LOCAL]) {
		conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
		conf.saddr.sa.sa_family = AF_INET;
	} else if (data[IFLA_VXLAN_LOCAL6]) {
		if (!IS_ENABLED(CONFIG_IPV6))
			return -EPFNOSUPPORT;

		/* TODO: respect scope id */
		conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
		conf.saddr.sa.sa_family = AF_INET6;
	}

	if (data[IFLA_VXLAN_LINK])
		conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);

S
stephen hemminger 已提交
2949
	if (data[IFLA_VXLAN_TOS])
2950
		conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
S
stephen hemminger 已提交
2951

2952
	if (data[IFLA_VXLAN_TTL])
2953
		conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2954

S
stephen hemminger 已提交
2955
	if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2956
		conf.flags |= VXLAN_F_LEARN;
S
stephen hemminger 已提交
2957 2958

	if (data[IFLA_VXLAN_AGEING])
2959
		conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
S
stephen hemminger 已提交
2960

D
David Stevens 已提交
2961
	if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2962
		conf.flags |= VXLAN_F_PROXY;
D
David Stevens 已提交
2963 2964

	if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2965
		conf.flags |= VXLAN_F_RSC;
D
David Stevens 已提交
2966 2967

	if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2968
		conf.flags |= VXLAN_F_L2MISS;
D
David Stevens 已提交
2969 2970

	if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2971
		conf.flags |= VXLAN_F_L3MISS;
D
David Stevens 已提交
2972

S
stephen hemminger 已提交
2973
	if (data[IFLA_VXLAN_LIMIT])
2974
		conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
S
stephen hemminger 已提交
2975

2976 2977 2978 2979
	if (data[IFLA_VXLAN_COLLECT_METADATA] &&
	    nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
		conf.flags |= VXLAN_F_COLLECT_METADATA;

2980 2981 2982
	if (data[IFLA_VXLAN_PORT_RANGE]) {
		const struct ifla_vxlan_port_range *p
			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2983 2984
		conf.port_min = ntohs(p->low);
		conf.port_max = ntohs(p->high);
2985 2986
	}

2987
	if (data[IFLA_VXLAN_PORT])
2988
		conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2989

2990
	if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2991
		conf.flags |= VXLAN_F_UDP_CSUM;
2992 2993 2994

	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
	    nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2995
		conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2996 2997 2998

	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
	    nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2999
		conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3000

T
Tom Herbert 已提交
3001 3002
	if (data[IFLA_VXLAN_REMCSUM_TX] &&
	    nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3003
		conf.flags |= VXLAN_F_REMCSUM_TX;
T
Tom Herbert 已提交
3004 3005 3006

	if (data[IFLA_VXLAN_REMCSUM_RX] &&
	    nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3007
		conf.flags |= VXLAN_F_REMCSUM_RX;
T
Tom Herbert 已提交
3008

T
Thomas Graf 已提交
3009
	if (data[IFLA_VXLAN_GBP])
3010
		conf.flags |= VXLAN_F_GBP;
T
Thomas Graf 已提交
3011

3012
	if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3013
		conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3014

3015 3016 3017 3018 3019
	err = vxlan_dev_configure(src_net, dev, &conf);
	switch (err) {
	case -ENODEV:
		pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
		break;
Y
Yan Burman 已提交
3020

3021 3022 3023
	case -EPERM:
		pr_info("IPv6 is disabled via sysctl\n");
		break;
S
stephen hemminger 已提交
3024

3025 3026 3027
	case -EEXIST:
		pr_info("duplicate VNI %u\n", conf.vni);
		break;
3028 3029
	}

3030
	return err;
S
stephen hemminger 已提交
3031 3032 3033 3034 3035
}

static void vxlan_dellink(struct net_device *dev, struct list_head *head)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);
N
Nicolas Dichtel 已提交
3036
	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
S
stephen hemminger 已提交
3037

3038
	spin_lock(&vn->sock_lock);
3039 3040
	if (!hlist_unhashed(&vxlan->hlist))
		hlist_del_rcu(&vxlan->hlist);
3041 3042
	spin_unlock(&vn->sock_lock);

T
Tom Herbert 已提交
3043
	gro_cells_destroy(&vxlan->gro_cells);
3044
	list_del(&vxlan->next);
S
stephen hemminger 已提交
3045 3046 3047 3048 3049 3050 3051
	unregister_netdevice_queue(dev, head);
}

static size_t vxlan_get_size(const struct net_device *dev)
{

	return nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_ID */
C
Cong Wang 已提交
3052
		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
S
stephen hemminger 已提交
3053
		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LINK */
C
Cong Wang 已提交
3054
		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
S
stephen hemminger 已提交
3055 3056 3057
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL */
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_LEARNING */
D
David Stevens 已提交
3058 3059 3060 3061
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_PROXY */
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_RSC */
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L2MISS */
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L3MISS */
3062
		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_COLLECT_METADATA */
S
stephen hemminger 已提交
3063 3064
		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_AGEING */
		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LIMIT */
3065
		nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3066 3067 3068 3069
		nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
T
Tom Herbert 已提交
3070 3071
		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
S
stephen hemminger 已提交
3072 3073 3074 3075 3076 3077
		0;
}

static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	const struct vxlan_dev *vxlan = netdev_priv(dev);
3078
	const struct vxlan_rdst *dst = &vxlan->default_dst;
3079
	struct ifla_vxlan_port_range ports = {
3080 3081
		.low =  htons(vxlan->cfg.port_min),
		.high = htons(vxlan->cfg.port_max),
3082
	};
S
stephen hemminger 已提交
3083

3084
	if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
S
stephen hemminger 已提交
3085 3086
		goto nla_put_failure;

C
Cong Wang 已提交
3087 3088
	if (!vxlan_addr_any(&dst->remote_ip)) {
		if (dst->remote_ip.sa.sa_family == AF_INET) {
3089 3090
			if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
					    dst->remote_ip.sin.sin_addr.s_addr))
C
Cong Wang 已提交
3091 3092 3093
				goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
		} else {
3094 3095
			if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
					     &dst->remote_ip.sin6.sin6_addr))
C
Cong Wang 已提交
3096 3097 3098 3099
				goto nla_put_failure;
#endif
		}
	}
S
stephen hemminger 已提交
3100

3101
	if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
S
stephen hemminger 已提交
3102 3103
		goto nla_put_failure;

3104 3105
	if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
		if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3106
			if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3107
					    vxlan->cfg.saddr.sin.sin_addr.s_addr))
C
Cong Wang 已提交
3108 3109 3110
				goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
		} else {
3111
			if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3112
					     &vxlan->cfg.saddr.sin6.sin6_addr))
C
Cong Wang 已提交
3113 3114 3115 3116
				goto nla_put_failure;
#endif
		}
	}
S
stephen hemminger 已提交
3117

3118 3119
	if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
	    nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
D
David Stevens 已提交
3120 3121 3122 3123 3124 3125 3126 3127 3128
	    nla_put_u8(skb, IFLA_VXLAN_LEARNING,
			!!(vxlan->flags & VXLAN_F_LEARN)) ||
	    nla_put_u8(skb, IFLA_VXLAN_PROXY,
			!!(vxlan->flags & VXLAN_F_PROXY)) ||
	    nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
	    nla_put_u8(skb, IFLA_VXLAN_L2MISS,
			!!(vxlan->flags & VXLAN_F_L2MISS)) ||
	    nla_put_u8(skb, IFLA_VXLAN_L3MISS,
			!!(vxlan->flags & VXLAN_F_L3MISS)) ||
3129 3130
	    nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
		       !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3131 3132 3133
	    nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
	    nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
	    nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3134 3135 3136 3137 3138
	    nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
			!!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
			!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
T
Tom Herbert 已提交
3139 3140 3141 3142 3143
			!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
			!!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
			!!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
S
stephen hemminger 已提交
3144 3145
		goto nla_put_failure;

3146 3147 3148
	if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
		goto nla_put_failure;

T
Thomas Graf 已提交
3149 3150 3151 3152
	if (vxlan->flags & VXLAN_F_GBP &&
	    nla_put_flag(skb, IFLA_VXLAN_GBP))
		goto nla_put_failure;

3153 3154 3155 3156
	if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
	    nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
		goto nla_put_failure;

S
stephen hemminger 已提交
3157 3158 3159 3160 3161 3162
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

3163 3164 3165 3166 3167 3168 3169
static struct net *vxlan_get_link_net(const struct net_device *dev)
{
	struct vxlan_dev *vxlan = netdev_priv(dev);

	return vxlan->net;
}

S
stephen hemminger 已提交
3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180
static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
	.kind		= "vxlan",
	.maxtype	= IFLA_VXLAN_MAX,
	.policy		= vxlan_policy,
	.priv_size	= sizeof(struct vxlan_dev),
	.setup		= vxlan_setup,
	.validate	= vxlan_validate,
	.newlink	= vxlan_newlink,
	.dellink	= vxlan_dellink,
	.get_size	= vxlan_get_size,
	.fill_info	= vxlan_fill_info,
3181
	.get_link_net	= vxlan_get_link_net,
S
stephen hemminger 已提交
3182 3183
};

3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209
static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
					     struct net_device *dev)
{
	struct vxlan_dev *vxlan, *next;
	LIST_HEAD(list_kill);

	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
		struct vxlan_rdst *dst = &vxlan->default_dst;

		/* In case we created vxlan device with carrier
		 * and we loose the carrier due to module unload
		 * we also need to remove vxlan device. In other
		 * cases, it's not necessary and remote_ifindex
		 * is 0 here, so no matches.
		 */
		if (dst->remote_ifindex == dev->ifindex)
			vxlan_dellink(vxlan->dev, &list_kill);
	}

	unregister_netdevice_many(&list_kill);
}

static int vxlan_lowerdev_event(struct notifier_block *unused,
				unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3210
	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3211

3212
	if (event == NETDEV_UNREGISTER)
3213 3214 3215 3216 3217 3218 3219 3220 3221
		vxlan_handle_lowerdev_unregister(vn, dev);

	return NOTIFY_DONE;
}

static struct notifier_block vxlan_notifier_block __read_mostly = {
	.notifier_call = vxlan_lowerdev_event,
};

S
stephen hemminger 已提交
3222 3223 3224
static __net_init int vxlan_init_net(struct net *net)
{
	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3225
	unsigned int h;
S
stephen hemminger 已提交
3226

3227
	INIT_LIST_HEAD(&vn->vxlan_list);
3228
	spin_lock_init(&vn->sock_lock);
S
stephen hemminger 已提交
3229

3230 3231
	for (h = 0; h < PORT_HASH_SIZE; ++h)
		INIT_HLIST_HEAD(&vn->sock_list[h]);
S
stephen hemminger 已提交
3232 3233 3234 3235

	return 0;
}

N
Nicolas Dichtel 已提交
3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
static void __net_exit vxlan_exit_net(struct net *net)
{
	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
	struct vxlan_dev *vxlan, *next;
	struct net_device *dev, *aux;
	LIST_HEAD(list);

	rtnl_lock();
	for_each_netdev_safe(net, dev, aux)
		if (dev->rtnl_link_ops == &vxlan_link_ops)
			unregister_netdevice_queue(dev, &list);

	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
		/* If vxlan->dev is in the same netns, it has already been added
		 * to the list by the previous loop.
		 */
T
Tom Herbert 已提交
3252 3253
		if (!net_eq(dev_net(vxlan->dev), net)) {
			gro_cells_destroy(&vxlan->gro_cells);
3254
			unregister_netdevice_queue(vxlan->dev, &list);
T
Tom Herbert 已提交
3255
		}
N
Nicolas Dichtel 已提交
3256 3257 3258 3259 3260 3261
	}

	unregister_netdevice_many(&list);
	rtnl_unlock();
}

S
stephen hemminger 已提交
3262 3263
static struct pernet_operations vxlan_net_ops = {
	.init = vxlan_init_net,
N
Nicolas Dichtel 已提交
3264
	.exit = vxlan_exit_net,
S
stephen hemminger 已提交
3265 3266 3267 3268 3269 3270 3271 3272
	.id   = &vxlan_net_id,
	.size = sizeof(struct vxlan_net),
};

static int __init vxlan_init_module(void)
{
	int rc;

3273 3274 3275 3276
	vxlan_wq = alloc_workqueue("vxlan", 0, 0);
	if (!vxlan_wq)
		return -ENOMEM;

S
stephen hemminger 已提交
3277 3278
	get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));

3279
	rc = register_pernet_subsys(&vxlan_net_ops);
S
stephen hemminger 已提交
3280 3281 3282
	if (rc)
		goto out1;

3283
	rc = register_netdevice_notifier(&vxlan_notifier_block);
S
stephen hemminger 已提交
3284 3285 3286
	if (rc)
		goto out2;

3287 3288 3289
	rc = rtnl_link_register(&vxlan_link_ops);
	if (rc)
		goto out3;
S
stephen hemminger 已提交
3290

3291 3292 3293
	return 0;
out3:
	unregister_netdevice_notifier(&vxlan_notifier_block);
S
stephen hemminger 已提交
3294
out2:
3295
	unregister_pernet_subsys(&vxlan_net_ops);
S
stephen hemminger 已提交
3296
out1:
3297
	destroy_workqueue(vxlan_wq);
S
stephen hemminger 已提交
3298 3299
	return rc;
}
3300
late_initcall(vxlan_init_module);
S
stephen hemminger 已提交
3301 3302 3303

static void __exit vxlan_cleanup_module(void)
{
3304
	rtnl_link_unregister(&vxlan_link_ops);
3305
	unregister_netdevice_notifier(&vxlan_notifier_block);
3306
	destroy_workqueue(vxlan_wq);
3307 3308
	unregister_pernet_subsys(&vxlan_net_ops);
	/* rcu_barrier() is called by netns */
S
stephen hemminger 已提交
3309 3310 3311 3312 3313
}
module_exit(vxlan_cleanup_module);

MODULE_LICENSE("GPL");
MODULE_VERSION(VXLAN_VERSION);
3314
MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
J
Jesse Brandeburg 已提交
3315
MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
S
stephen hemminger 已提交
3316
MODULE_ALIAS_RTNL_LINK("vxlan");