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path: root/drivers/net/vxlan.c
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-rw-r--r--drivers/net/vxlan.c2984
1 files changed, 2984 insertions, 0 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
new file mode 100644
index 00000000000..9f79192c9aa
--- /dev/null
+++ b/drivers/net/vxlan.c
@@ -0,0 +1,2984 @@
+/*
+ * VXLAN: Virtual eXtensible Local Area Network
+ *
+ * Copyright (c) 2012-2013 Vyatta Inc.
+ *
+ * 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>
+#include <linux/if_vlan.h>
+#include <linux/hash.h>
+#include <linux/ethtool.h>
+#include <net/arp.h>
+#include <net/ndisc.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#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>
+#include <net/vxlan.h>
+#include <net/protocol.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+#endif
+
+#define VXLAN_VERSION "0.1"
+
+#define PORT_HASH_BITS 8
+#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
+#define VNI_HASH_BITS 10
+#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
+#define FDB_HASH_BITS 8
+#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
+#define FDB_AGE_DEFAULT 300 /* 5 min */
+#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
+
+#define VXLAN_N_VID (1u << 24)
+#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
+#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
+
+#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
+
+/* VXLAN protocol header */
+struct vxlanhdr {
+ __be32 vx_flags;
+ __be32 vx_vni;
+};
+
+/* UDP port for VXLAN traffic.
+ * The IANA assigned port is 4789, but the Linux default is 8472
+ * for compatibility with early adopters.
+ */
+static unsigned short vxlan_port __read_mostly = 8472;
+module_param_named(udp_port, vxlan_port, ushort, 0444);
+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");
+
+static int vxlan_net_id;
+
+static const u8 all_zeros_mac[ETH_ALEN];
+
+/* per-network namespace private data for this module */
+struct vxlan_net {
+ struct list_head vxlan_list;
+ struct hlist_head sock_list[PORT_HASH_SIZE];
+ spinlock_t sock_lock;
+};
+
+union vxlan_addr {
+ struct sockaddr_in sin;
+ struct sockaddr_in6 sin6;
+ struct sockaddr sa;
+};
+
+struct vxlan_rdst {
+ union vxlan_addr remote_ip;
+ __be16 remote_port;
+ u32 remote_vni;
+ u32 remote_ifindex;
+ struct list_head list;
+ struct rcu_head rcu;
+};
+
+/* 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;
+ struct list_head remotes;
+ u16 state; /* see ndm_state */
+ u8 flags; /* see ndm_flags */
+ u8 eth_addr[ETH_ALEN];
+};
+
+/* Pseudo network device */
+struct vxlan_dev {
+ struct hlist_node hlist; /* vni hash table */
+ struct list_head next; /* vxlan's per namespace list */
+ struct vxlan_sock *vn_sock; /* listening socket */
+ struct net_device *dev;
+ struct net *net; /* netns for packet i/o */
+ struct vxlan_rdst default_dst; /* default destination */
+ union vxlan_addr saddr; /* source address */
+ __be16 dst_port;
+ __u16 port_min; /* source port range */
+ __u16 port_max;
+ __u8 tos; /* TOS override */
+ __u8 ttl;
+ u32 flags; /* VXLAN_F_* in vxlan.h */
+
+ struct work_struct sock_work;
+ struct work_struct igmp_join;
+ struct work_struct igmp_leave;
+
+ unsigned long age_interval;
+ struct timer_list age_timer;
+ spinlock_t hash_lock;
+ unsigned int addrcnt;
+ unsigned int addrmax;
+
+ struct hlist_head fdb_head[FDB_HASH_SIZE];
+};
+
+/* salt for hash table */
+static u32 vxlan_salt __read_mostly;
+static struct workqueue_struct *vxlan_wq;
+
+static void vxlan_sock_work(struct work_struct *work);
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+ 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;
+}
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+ 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);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+ 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));
+}
+
+static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+ if (nla_len(nla) >= sizeof(struct in6_addr)) {
+ nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
+ ip->sa.sa_family = AF_INET6;
+ return 0;
+ } else if (nla_len(nla) >= sizeof(__be32)) {
+ ip->sin.sin_addr.s_addr = nla_get_be32(nla);
+ ip->sa.sa_family = AF_INET;
+ return 0;
+ } else {
+ return -EAFNOSUPPORT;
+ }
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+ const union vxlan_addr *ip)
+{
+ if (ip->sa.sa_family == AF_INET6)
+ return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
+ else
+ return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
+}
+
+#else /* !CONFIG_IPV6 */
+
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+ return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+ return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+ return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+ if (nla_len(nla) >= sizeof(struct in6_addr)) {
+ return -EAFNOSUPPORT;
+ } else if (nla_len(nla) >= sizeof(__be32)) {
+ ip->sin.sin_addr.s_addr = nla_get_be32(nla);
+ ip->sa.sa_family = AF_INET;
+ return 0;
+ } else {
+ return -EAFNOSUPPORT;
+ }
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+ const union vxlan_addr *ip)
+{
+ return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
+}
+#endif
+
+/* 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)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+ return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
+}
+
+/* First remote destination for a forwarding entry.
+ * Guaranteed to be non-NULL because remotes are never deleted.
+ */
+static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
+{
+ 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);
+}
+
+/* Find VXLAN socket based on network namespace and UDP port */
+static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
+{
+ struct vxlan_sock *vs;
+
+ hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
+ if (inet_sk(vs->sock->sk)->inet_sport == port)
+ return vs;
+ }
+ return NULL;
+}
+
+static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
+{
+ struct vxlan_dev *vxlan;
+
+ hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
+ if (vxlan->default_dst.remote_vni == id)
+ return vxlan;
+ }
+
+ return NULL;
+}
+
+/* Look up VNI in a per net namespace table */
+static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
+{
+ struct vxlan_sock *vs;
+
+ vs = vxlan_find_sock(net, port);
+ if (!vs)
+ return NULL;
+
+ return vxlan_vs_find_vni(vs, id);
+}
+
+/* Fill in neighbour message in skbuff. */
+static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
+ const struct vxlan_fdb *fdb,
+ u32 portid, u32 seq, int type, unsigned int flags,
+ const struct vxlan_rdst *rdst)
+{
+ unsigned long now = jiffies;
+ struct nda_cacheinfo ci;
+ struct nlmsghdr *nlh;
+ struct ndmsg *ndm;
+ bool send_ip, send_eth;
+
+ nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ ndm = nlmsg_data(nlh);
+ memset(ndm, 0, sizeof(*ndm));
+
+ send_eth = send_ip = true;
+
+ if (type == RTM_GETNEIGH) {
+ ndm->ndm_family = AF_INET;
+ send_ip = !vxlan_addr_any(&rdst->remote_ip);
+ send_eth = !is_zero_ether_addr(fdb->eth_addr);
+ } else
+ ndm->ndm_family = AF_BRIDGE;
+ ndm->ndm_state = fdb->state;
+ ndm->ndm_ifindex = vxlan->dev->ifindex;
+ ndm->ndm_flags = fdb->flags;
+ ndm->ndm_type = RTN_UNICAST;
+
+ if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
+ goto nla_put_failure;
+
+ if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
+ goto nla_put_failure;
+
+ if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
+ nla_put_be16(skb, NDA_PORT, rdst->remote_port))
+ goto nla_put_failure;
+ if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
+ nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
+ goto nla_put_failure;
+ if (rdst->remote_ifindex &&
+ nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
+ 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;
+
+ return nlmsg_end(skb, nlh);
+
+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 */
+ + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
+ + nla_total_size(sizeof(__be16)) /* NDA_PORT */
+ + nla_total_size(sizeof(__be32)) /* NDA_VNI */
+ + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
+ + nla_total_size(sizeof(struct nda_cacheinfo));
+}
+
+static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+ struct vxlan_rdst *rd, int type)
+{
+ 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;
+
+ err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
+ 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);
+}
+
+static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb f = {
+ .state = NUD_STALE,
+ };
+ struct vxlan_rdst remote = {
+ .remote_ip = *ipa, /* goes to NDA_DST */
+ .remote_vni = VXLAN_N_VID,
+ };
+
+ vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
+}
+
+static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
+{
+ struct vxlan_fdb f = {
+ .state = NUD_STALE,
+ };
+ struct vxlan_rdst remote = { };
+
+ memcpy(f.eth_addr, eth_addr, ETH_ALEN);
+
+ vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
+}
+
+/* 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;
+#else
+ value <<= 16;
+#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 */
+static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
+ const u8 *mac)
+{
+ struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
+ struct vxlan_fdb *f;
+
+ hlist_for_each_entry_rcu(f, head, hlist) {
+ if (ether_addr_equal(mac, f->eth_addr))
+ return f;
+ }
+
+ return NULL;
+}
+
+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;
+}
+
+/* caller should hold vxlan->hash_lock */
+static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port,
+ __u32 vni, __u32 ifindex)
+{
+ struct vxlan_rdst *rd;
+
+ list_for_each_entry(rd, &f->remotes, list) {
+ if (vxlan_addr_equal(&rd->remote_ip, ip) &&
+ rd->remote_port == port &&
+ rd->remote_vni == vni &&
+ rd->remote_ifindex == ifindex)
+ return rd;
+ }
+
+ return NULL;
+}
+
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
+{
+ 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;
+ rd->remote_ip = *ip;
+ rd->remote_port = port;
+ rd->remote_vni = vni;
+ rd->remote_ifindex = ifindex;
+ return 1;
+}
+
+/* Add/update destinations for multicast */
+static int vxlan_fdb_append(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port, __u32 vni,
+ __u32 ifindex, struct vxlan_rdst **rdp)
+{
+ struct vxlan_rdst *rd;
+
+ rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+ if (rd)
+ return 0;
+
+ rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
+ if (rd == NULL)
+ return -ENOBUFS;
+ rd->remote_ip = *ip;
+ rd->remote_port = port;
+ rd->remote_vni = vni;
+ rd->remote_ifindex = ifindex;
+
+ list_add_tail_rcu(&rd->list, &f->remotes);
+
+ *rdp = rd;
+ return 1;
+}
+
+static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+ struct sk_buff *p, **pp = NULL;
+ struct vxlanhdr *vh, *vh2;
+ struct ethhdr *eh, *eh2;
+ unsigned int hlen, off_vx, off_eth;
+ const struct packet_offload *ptype;
+ __be16 type;
+ int flush = 1;
+
+ 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;
+ }
+ skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
+ skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
+
+ off_eth = skb_gro_offset(skb);
+ hlen = off_eth + sizeof(*eh);
+ eh = skb_gro_header_fast(skb, off_eth);
+ if (skb_gro_header_hard(skb, hlen)) {
+ eh = skb_gro_header_slow(skb, hlen, off_eth);
+ if (unlikely(!eh))
+ goto out;
+ }
+
+ flush = 0;
+
+ for (p = *head; p; p = p->next) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ vh2 = (struct vxlanhdr *)(p->data + off_vx);
+ eh2 = (struct ethhdr *)(p->data + off_eth);
+ if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ type = eh->h_proto;
+
+ rcu_read_lock();
+ ptype = gro_find_receive_by_type(type);
+ if (ptype == NULL) {
+ flush = 1;
+ goto out_unlock;
+ }
+
+ skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
+ skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
+ pp = ptype->callbacks.gro_receive(head, skb);
+
+out_unlock:
+ rcu_read_unlock();
+out:
+ NAPI_GRO_CB(skb)->flush |= flush;
+
+ return pp;
+}
+
+static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ struct ethhdr *eh;
+ struct packet_offload *ptype;
+ __be16 type;
+ int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
+ int err = -ENOSYS;
+
+ eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
+ type = eh->h_proto;
+
+ rcu_read_lock();
+ ptype = gro_find_complete_by_type(type);
+ if (ptype != NULL)
+ err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
+
+ rcu_read_unlock();
+ return err;
+}
+
+/* Notify netdevs that UDP port started listening */
+static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
+{
+ struct net_device *dev;
+ struct sock *sk = vs->sock->sk;
+ struct net *net = sock_net(sk);
+ sa_family_t sa_family = sk->sk_family;
+ __be16 port = inet_sk(sk)->inet_sport;
+ int err;
+
+ if (sa_family == AF_INET) {
+ err = udp_add_offload(&vs->udp_offloads);
+ if (err)
+ pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
+ }
+
+ 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 */
+static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
+{
+ struct net_device *dev;
+ struct sock *sk = vs->sock->sk;
+ struct net *net = sock_net(sk);
+ sa_family_t sa_family = sk->sk_family;
+ __be16 port = inet_sk(sk)->inet_sport;
+
+ 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();
+
+ if (sa_family == AF_INET)
+ udp_del_offload(&vs->udp_offloads);
+}
+
+/* Add new entry to forwarding table -- assumes lock held */
+static int vxlan_fdb_create(struct vxlan_dev *vxlan,
+ const u8 *mac, union vxlan_addr *ip,
+ __u16 state, __u16 flags,
+ __be16 port, __u32 vni, __u32 ifindex,
+ __u8 ndm_flags)
+{
+ struct vxlan_rdst *rd = NULL;
+ struct vxlan_fdb *f;
+ int notify = 0;
+
+ f = __vxlan_find_mac(vxlan, mac);
+ 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;
+ }
+ if (f->flags != ndm_flags) {
+ f->flags = ndm_flags;
+ f->updated = jiffies;
+ notify = 1;
+ }
+ if ((flags & NLM_F_REPLACE)) {
+ /* Only change unicasts */
+ if (!(is_multicast_ether_addr(f->eth_addr) ||
+ is_zero_ether_addr(f->eth_addr))) {
+ int rc = vxlan_fdb_replace(f, ip, port, vni,
+ ifindex);
+
+ if (rc < 0)
+ return rc;
+ notify |= rc;
+ } else
+ return -EOPNOTSUPP;
+ }
+ if ((flags & NLM_F_APPEND) &&
+ (is_multicast_ether_addr(f->eth_addr) ||
+ is_zero_ether_addr(f->eth_addr))) {
+ int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
+ &rd);
+
+ if (rc < 0)
+ return rc;
+ notify |= rc;
+ }
+ } else {
+ if (!(flags & NLM_F_CREATE))
+ return -ENOENT;
+
+ if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
+ return -ENOSPC;
+
+ /* Disallow replace to add a multicast entry */
+ if ((flags & NLM_F_REPLACE) &&
+ (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
+ return -EOPNOTSUPP;
+
+ netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
+ f = kmalloc(sizeof(*f), GFP_ATOMIC);
+ if (!f)
+ return -ENOMEM;
+
+ notify = 1;
+ f->state = state;
+ f->flags = ndm_flags;
+ f->updated = f->used = jiffies;
+ INIT_LIST_HEAD(&f->remotes);
+ memcpy(f->eth_addr, mac, ETH_ALEN);
+
+ vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+
+ ++vxlan->addrcnt;
+ hlist_add_head_rcu(&f->hlist,
+ vxlan_fdb_head(vxlan, mac));
+ }
+
+ if (notify) {
+ if (rd == NULL)
+ rd = first_remote_rtnl(f);
+ vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
+ }
+
+ return 0;
+}
+
+static void vxlan_fdb_free(struct rcu_head *head)
+{
+ struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
+ struct vxlan_rdst *rd, *nd;
+
+ list_for_each_entry_safe(rd, nd, &f->remotes, list)
+ kfree(rd);
+ kfree(f);
+}
+
+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;
+ vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
+
+ hlist_del_rcu(&f->hlist);
+ call_rcu(&f->rcu, vxlan_fdb_free);
+}
+
+static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
+ union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
+{
+ struct net *net = dev_net(vxlan->dev);
+ int err;
+
+ if (tb[NDA_DST]) {
+ err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
+ if (err)
+ return err;
+ } else {
+ 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
+ }
+ }
+
+ if (tb[NDA_PORT]) {
+ if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
+ return -EINVAL;
+ *port = nla_get_be16(tb[NDA_PORT]);
+ } else {
+ *port = vxlan->dst_port;
+ }
+
+ if (tb[NDA_VNI]) {
+ if (nla_len(tb[NDA_VNI]) != sizeof(u32))
+ return -EINVAL;
+ *vni = nla_get_u32(tb[NDA_VNI]);
+ } else {
+ *vni = vxlan->default_dst.remote_vni;
+ }
+
+ if (tb[NDA_IFINDEX]) {
+ struct net_device *tdev;
+
+ if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
+ return -EINVAL;
+ *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
+ tdev = __dev_get_by_index(net, *ifindex);
+ if (!tdev)
+ return -EADDRNOTAVAIL;
+ } 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,
+ const unsigned char *addr, u16 flags)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ /* struct net *net = dev_net(vxlan->dev); */
+ union vxlan_addr ip;
+ __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;
+
+ if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
+ return -EAFNOSUPPORT;
+
+ spin_lock_bh(&vxlan->hash_lock);
+ err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
+ port, vni, ifindex, ndm->ndm_flags);
+ spin_unlock_bh(&vxlan->hash_lock);
+
+ return err;
+}
+
+/* Delete entry (via netlink) */
+static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb *f;
+ struct vxlan_rdst *rd = NULL;
+ union vxlan_addr ip;
+ __be16 port;
+ u32 vni, ifindex;
+ int err;
+
+ err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
+ if (err)
+ return err;
+
+ err = -ENOENT;
+
+ spin_lock_bh(&vxlan->hash_lock);
+ f = vxlan_find_mac(vxlan, addr);
+ if (!f)
+ goto out;
+
+ if (!vxlan_addr_any(&ip)) {
+ rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
+ 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);
+ vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
+ kfree_rcu(rd, rcu);
+ goto out;
+ }
+
+ vxlan_fdb_destroy(vxlan, f);
+
+out:
+ spin_unlock_bh(&vxlan->hash_lock);
+
+ return err;
+}
+
+/* Dump forwarding table */
+static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev, int idx)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ unsigned int h;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ struct vxlan_fdb *f;
+ int err;
+
+ hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
+ struct vxlan_rdst *rd;
+
+ if (idx < cb->args[0])
+ goto skip;
+
+ list_for_each_entry_rcu(rd, &f->remotes, list) {
+ err = vxlan_fdb_info(skb, vxlan, f,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNEIGH,
+ NLM_F_MULTI, rd);
+ if (err < 0)
+ goto out;
+ }
+skip:
+ ++idx;
+ }
+ }
+out:
+ return idx;
+}
+
+/* Watch incoming packets to learn mapping between Ethernet address
+ * and Tunnel endpoint.
+ * Return true if packet is bogus and should be droppped.
+ */
+static bool vxlan_snoop(struct net_device *dev,
+ union vxlan_addr *src_ip, const u8 *src_mac)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb *f;
+
+ f = vxlan_find_mac(vxlan, src_mac);
+ if (likely(f)) {
+ struct vxlan_rdst *rdst = first_remote_rcu(f);
+
+ if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
+ return false;
+
+ /* Don't migrate static entries, drop packets */
+ if (f->state & NUD_NOARP)
+ return true;
+
+ if (net_ratelimit())
+ netdev_info(dev,
+ "%pM migrated from %pIS to %pIS\n",
+ src_mac, &rdst->remote_ip, &src_ip);
+
+ rdst->remote_ip = *src_ip;
+ f->updated = jiffies;
+ vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
+ } else {
+ /* learned new entry */
+ spin_lock(&vxlan->hash_lock);
+
+ /* 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,
+ vxlan->dst_port,
+ vxlan->default_dst.remote_vni,
+ 0, NTF_SELF);
+ spin_unlock(&vxlan->hash_lock);
+ }
+
+ return false;
+}
+
+/* See if multicast group is already in use by other ID */
+static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
+{
+ struct vxlan_dev *vxlan;
+
+ /* The vxlan_sock is only used by dev, leaving group has
+ * no effect on other vxlan devices.
+ */
+ if (atomic_read(&dev->vn_sock->refcnt) == 1)
+ return false;
+
+ list_for_each_entry(vxlan, &vn->vxlan_list, next) {
+ if (!netif_running(vxlan->dev) || vxlan == dev)
+ continue;
+
+ if (vxlan->vn_sock != dev->vn_sock)
+ continue;
+
+ 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;
+ }
+
+ return false;
+}
+
+static void vxlan_sock_hold(struct vxlan_sock *vs)
+{
+ atomic_inc(&vs->refcnt);
+}
+
+void vxlan_sock_release(struct vxlan_sock *vs)
+{
+ struct sock *sk = vs->sock->sk;
+ struct net *net = sock_net(sk);
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+ if (!atomic_dec_and_test(&vs->refcnt))
+ return;
+
+ spin_lock(&vn->sock_lock);
+ hlist_del_rcu(&vs->hlist);
+ rcu_assign_sk_user_data(vs->sock->sk, NULL);
+ vxlan_notify_del_rx_port(vs);
+ spin_unlock(&vn->sock_lock);
+
+ queue_work(vxlan_wq, &vs->del_work);
+}
+EXPORT_SYMBOL_GPL(vxlan_sock_release);
+
+/* Callback to update multicast group membership when first VNI on
+ * multicast asddress is brought up
+ * Done as workqueue because ip_mc_join_group acquires RTNL.
+ */
+static void vxlan_igmp_join(struct work_struct *work)
+{
+ struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
+ struct vxlan_sock *vs = vxlan->vn_sock;
+ struct sock *sk = vs->sock->sk;
+ union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+ int ifindex = vxlan->default_dst.remote_ifindex;
+
+ lock_sock(sk);
+ if (ip->sa.sa_family == AF_INET) {
+ struct ip_mreqn mreq = {
+ .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
+ .imr_ifindex = ifindex,
+ };
+
+ ip_mc_join_group(sk, &mreq);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
+ &ip->sin6.sin6_addr);
+#endif
+ }
+ release_sock(sk);
+
+ vxlan_sock_release(vs);
+ dev_put(vxlan->dev);
+}
+
+/* Inverse of vxlan_igmp_join when last VNI is brought down */
+static void vxlan_igmp_leave(struct work_struct *work)
+{
+ struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
+ struct vxlan_sock *vs = vxlan->vn_sock;
+ struct sock *sk = vs->sock->sk;
+ union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+ int ifindex = vxlan->default_dst.remote_ifindex;
+
+ lock_sock(sk);
+ if (ip->sa.sa_family == AF_INET) {
+ struct ip_mreqn mreq = {
+ .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
+ .imr_ifindex = ifindex,
+ };
+
+ ip_mc_leave_group(sk, &mreq);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
+ &ip->sin6.sin6_addr);
+#endif
+ }
+
+ release_sock(sk);
+
+ vxlan_sock_release(vs);
+ dev_put(vxlan->dev);
+}
+
+/* Callback from net/ipv4/udp.c to receive packets */
+static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct vxlan_sock *vs;
+ struct vxlanhdr *vxh;
+
+ /* Need Vxlan and inner Ethernet header to be present */
+ if (!pskb_may_pull(skb, VXLAN_HLEN))
+ goto error;
+
+ /* Return packets with reserved bits set */
+ vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
+ if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
+ (vxh->vx_vni & htonl(0xff))) {
+ netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
+ ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
+ goto error;
+ }
+
+ if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
+ goto drop;
+
+ vs = rcu_dereference_sk_user_data(sk);
+ if (!vs)
+ goto drop;
+
+ skb_pop_rcv_encapsulation(skb);
+
+ vs->rcv(vs, skb, vxh->vx_vni);
+ return 0;
+
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+ return 0;
+
+error:
+ /* Return non vxlan pkt */
+ return 1;
+}
+
+static void vxlan_rcv(struct vxlan_sock *vs,
+ struct sk_buff *skb, __be32 vx_vni)
+{
+ struct iphdr *oip = NULL;
+ struct ipv6hdr *oip6 = NULL;
+ struct vxlan_dev *vxlan;
+ struct pcpu_sw_netstats *stats;
+ union vxlan_addr saddr;
+ __u32 vni;
+ int err = 0;
+ union vxlan_addr *remote_ip;
+
+ vni = ntohl(vx_vni) >> 8;
+ /* Is this VNI defined? */
+ vxlan = vxlan_vs_find_vni(vs, vni);
+ if (!vxlan)
+ goto drop;
+
+ remote_ip = &vxlan->default_dst.remote_ip;
+ 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;
+
+ /* Re-examine inner Ethernet packet */
+ if (remote_ip->sa.sa_family == AF_INET) {
+ 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 ((vxlan->flags & VXLAN_F_LEARN) &&
+ vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
+ goto drop;
+
+ skb_reset_network_header(skb);
+
+ 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);
+
+ netif_rx(skb);
+
+ return;
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+}
+
+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);
+ if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+ /* 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);
+
+ if (reply == NULL)
+ goto out;
+
+ 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++;
+ } else if (vxlan->flags & VXLAN_F_L3MISS) {
+ union vxlan_addr ipa = {
+ .sin.sin_addr.s_addr = tip,
+ .sa.sa_family = AF_INET,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ }
+out:
+ consume_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+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;
+}
+
+static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct nd_msg *msg;
+ const struct ipv6hdr *iphdr;
+ const struct in6_addr *saddr, *daddr;
+ struct neighbour *n;
+ struct inet6_dev *in6_dev;
+
+ in6_dev = __in6_dev_get(dev);
+ if (!in6_dev)
+ goto out;
+
+ if (!pskb_may_pull(skb, skb->len))
+ 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;
+
+ if (ipv6_addr_loopback(daddr) ||
+ ipv6_addr_is_multicast(&msg->target))
+ goto out;
+
+ n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, 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);
+ if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+ /* bridge-local neighbor */
+ neigh_release(n);
+ goto out;
+ }
+
+ reply = vxlan_na_create(skb, n,
+ !!(f ? f->flags & NTF_ROUTER : 0));
+
+ neigh_release(n);
+
+ if (reply == NULL)
+ goto out;
+
+ if (netif_rx_ni(reply) == NET_RX_DROP)
+ dev->stats.rx_dropped++;
+
+ } else if (vxlan->flags & VXLAN_F_L3MISS) {
+ union vxlan_addr ipa = {
+ .sin6.sin6_addr = msg->target,
+ .sa.sa_family = AF_INET6,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ }
+
+out:
+ consume_skb(skb);
+ return NETDEV_TX_OK;
+}
+#endif
+
+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:
+ {
+ struct iphdr *pip;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ return false;
+ pip = ip_hdr(skb);
+ n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
+ if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
+ union vxlan_addr ipa = {
+ .sin.sin_addr.s_addr = pip->daddr,
+ .sa.sa_family = AF_INET,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ return false;
+ }
+
+ break;
+ }
+#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,
+ .sa.sa_family = AF_INET6,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ return false;
+ }
+
+ break;
+ }
+#endif
+ default:
+ return false;
+ }
+
+ if (n) {
+ bool diff;
+
+ diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
+ 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;
+ }
+
+ return false;
+}
+
+/* Compute source port for outgoing packet
+ * first choice to use L4 flow hash since it will spread
+ * better and maybe available from hardware
+ * secondary choice is to use jhash on the Ethernet header
+ */
+__be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
+{
+ unsigned int range = (port_max - port_min) + 1;
+ u32 hash;
+
+ hash = skb_get_hash(skb);
+ if (!hash)
+ hash = jhash(skb->data, 2 * ETH_ALEN,
+ (__force u32) skb->protocol);
+
+ return htons((((u64) hash * range) >> 32) + port_min);
+}
+EXPORT_SYMBOL_GPL(vxlan_src_port);
+
+static inline struct sk_buff *vxlan_handle_offloads(struct sk_buff *skb,
+ bool udp_csum)
+{
+ int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+ return iptunnel_handle_offloads(skb, udp_csum, type);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int vxlan6_xmit_skb(struct vxlan_sock *vs,
+ struct dst_entry *dst, struct sk_buff *skb,
+ struct net_device *dev, struct in6_addr *saddr,
+ struct in6_addr *daddr, __u8 prio, __u8 ttl,
+ __be16 src_port, __be16 dst_port, __be32 vni,
+ bool xnet)
+{
+ struct ipv6hdr *ip6h;
+ struct vxlanhdr *vxh;
+ struct udphdr *uh;
+ int min_headroom;
+ int err;
+
+ skb = vxlan_handle_offloads(skb, !udp_get_no_check6_tx(vs->sock->sk));
+ if (IS_ERR(skb))
+ return -EINVAL;
+
+ skb_scrub_packet(skb, xnet);
+
+ min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ + VXLAN_HLEN + sizeof(struct ipv6hdr)
+ + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
+
+ /* Need space for new headers (invalidates iph ptr) */
+ err = skb_cow_head(skb, min_headroom);
+ if (unlikely(err))
+ return err;
+
+ if (vlan_tx_tag_present(skb)) {
+ if (WARN_ON(!__vlan_put_tag(skb,
+ skb->vlan_proto,
+ vlan_tx_tag_get(skb))))
+ return -ENOMEM;
+
+ skb->vlan_tci = 0;
+ }
+
+ vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+ vxh->vx_flags = htonl(VXLAN_FLAGS);
+ vxh->vx_vni = vni;
+
+ __skb_push(skb, sizeof(*uh));
+ skb_reset_transport_header(skb);
+ uh = udp_hdr(skb);
+
+ uh->dest = dst_port;
+ uh->source = src_port;
+
+ uh->len = htons(skb->len);
+
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
+ IPSKB_REROUTED);
+ skb_dst_set(skb, dst);
+
+ udp6_set_csum(udp_get_no_check6_tx(vs->sock->sk), skb,
+ saddr, daddr, skb->len);
+
+ __skb_push(skb, sizeof(*ip6h));
+ skb_reset_network_header(skb);
+ ip6h = ipv6_hdr(skb);
+ ip6h->version = 6;
+ ip6h->priority = prio;
+ ip6h->flow_lbl[0] = 0;
+ ip6h->flow_lbl[1] = 0;
+ ip6h->flow_lbl[2] = 0;
+ ip6h->payload_len = htons(skb->len);
+ ip6h->nexthdr = IPPROTO_UDP;
+ ip6h->hop_limit = ttl;
+ ip6h->daddr = *daddr;
+ ip6h->saddr = *saddr;
+
+ ip6tunnel_xmit(skb, dev);
+ return 0;
+}
+#endif
+
+int vxlan_xmit_skb(struct vxlan_sock *vs,
+ struct rtable *rt, struct sk_buff *skb,
+ __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
+ __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
+{
+ struct vxlanhdr *vxh;
+ struct udphdr *uh;
+ int min_headroom;
+ int err;
+
+ skb = vxlan_handle_offloads(skb, !vs->sock->sk->sk_no_check_tx);
+ if (IS_ERR(skb))
+ return -EINVAL;
+
+ min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ + VXLAN_HLEN + sizeof(struct iphdr)
+ + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
+
+ /* Need space for new headers (invalidates iph ptr) */
+ err = skb_cow_head(skb, min_headroom);
+ if (unlikely(err))
+ return err;
+
+ if (vlan_tx_tag_present(skb)) {
+ if (WARN_ON(!__vlan_put_tag(skb,
+ skb->vlan_proto,
+ vlan_tx_tag_get(skb))))
+ return -ENOMEM;
+
+ skb->vlan_tci = 0;
+ }
+
+ vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+ vxh->vx_flags = htonl(VXLAN_FLAGS);
+ vxh->vx_vni = vni;
+
+ __skb_push(skb, sizeof(*uh));
+ skb_reset_transport_header(skb);
+ uh = udp_hdr(skb);
+
+ uh->dest = dst_port;
+ uh->source = src_port;
+
+ uh->len = htons(skb->len);
+
+ udp_set_csum(vs->sock->sk->sk_no_check_tx, skb,
+ src, dst, skb->len);
+
+ return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
+ tos, ttl, df, xnet);
+}
+EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
+
+/* 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)
+{
+ struct pcpu_sw_netstats *tx_stats, *rx_stats;
+ union vxlan_addr loopback;
+ union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
+
+ tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
+ rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
+ skb->pkt_type = PACKET_HOST;
+ skb->encapsulation = 0;
+ skb->dev = dst_vxlan->dev;
+ __skb_pull(skb, skb_network_offset(skb));
+
+ 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
+ }
+
+ if (dst_vxlan->flags & VXLAN_F_LEARN)
+ vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
+
+ u64_stats_update_begin(&tx_stats->syncp);
+ tx_stats->tx_packets++;
+ tx_stats->tx_bytes += skb->len;
+ 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++;
+ rx_stats->rx_bytes += skb->len;
+ u64_stats_update_end(&rx_stats->syncp);
+ } else {
+ skb->dev->stats.rx_dropped++;
+ }
+}
+
+static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
+ struct vxlan_rdst *rdst, bool did_rsc)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct rtable *rt = NULL;
+ const struct iphdr *old_iph;
+ struct flowi4 fl4;
+ union vxlan_addr *dst;
+ __be16 src_port = 0, dst_port;
+ u32 vni;
+ __be16 df = 0;
+ __u8 tos, ttl;
+ int err;
+
+ dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
+ vni = rdst->remote_vni;
+ dst = &rdst->remote_ip;
+
+ if (vxlan_addr_any(dst)) {
+ if (did_rsc) {
+ /* short-circuited back to local bridge */
+ vxlan_encap_bypass(skb, vxlan, vxlan);
+ return;
+ }
+ goto drop;
+ }
+
+ old_iph = ip_hdr(skb);
+
+ ttl = vxlan->ttl;
+ if (!ttl && vxlan_addr_multicast(dst))
+ ttl = 1;
+
+ tos = vxlan->tos;
+ if (tos == 1)
+ tos = ip_tunnel_get_dsfield(old_iph, skb);
+
+ src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
+
+ if (dst->sa.sa_family == AF_INET) {
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = rdst->remote_ifindex;
+ fl4.flowi4_tos = RT_TOS(tos);
+ fl4.daddr = dst->sin.sin_addr.s_addr;
+ fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
+
+ rt = ip_route_output_key(vxlan->net, &fl4);
+ 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;
+ }
+
+ if (rt->dst.dev == dev) {
+ netdev_dbg(dev, "circular route to %pI4\n",
+ &dst->sin.sin_addr.s_addr);
+ dev->stats.collisions++;
+ goto rt_tx_error;
+ }
+
+ /* 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);
+ dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
+ 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);
+
+ err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
+ fl4.saddr, dst->sin.sin_addr.s_addr,
+ tos, ttl, df, src_port, dst_port,
+ htonl(vni << 8),
+ !net_eq(vxlan->net, dev_net(vxlan->dev)));
+
+ if (err < 0)
+ goto rt_tx_error;
+ iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct sock *sk = vxlan->vn_sock->sock->sk;
+ struct dst_entry *ndst;
+ struct flowi6 fl6;
+ u32 flags;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = rdst->remote_ifindex;
+ fl6.daddr = dst->sin6.sin6_addr;
+ fl6.saddr = vxlan->saddr.sin6.sin6_addr;
+ fl6.flowi6_proto = IPPROTO_UDP;
+
+ if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
+ netdev_dbg(dev, "no route to %pI6\n",
+ &dst->sin6.sin6_addr);
+ dev->stats.tx_carrier_errors++;
+ goto tx_error;
+ }
+
+ 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;
+ }
+
+ /* Bypass encapsulation if the destination is local */
+ flags = ((struct rt6_info *)ndst)->rt6i_flags;
+ if (flags & RTF_LOCAL &&
+ !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+ struct vxlan_dev *dst_vxlan;
+
+ dst_release(ndst);
+ dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
+ if (!dst_vxlan)
+ goto tx_error;
+ vxlan_encap_bypass(skb, vxlan, dst_vxlan);
+ return;
+ }
+
+ ttl = ttl ? : ip6_dst_hoplimit(ndst);
+
+ err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
+ dev, &fl6.saddr, &fl6.daddr, 0, ttl,
+ src_port, dst_port, htonl(vni << 8),
+ !net_eq(vxlan->net, dev_net(vxlan->dev)));
+#endif
+ }
+
+ return;
+
+drop:
+ dev->stats.tx_dropped++;
+ goto tx_free;
+
+rt_tx_error:
+ ip_rt_put(rt);
+tx_error:
+ dev->stats.tx_errors++;
+tx_free:
+ dev_kfree_skb(skb);
+}
+
+/* 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);
+ struct ethhdr *eth;
+ bool did_rsc = false;
+ struct vxlan_rdst *rdst, *fdst = NULL;
+ struct vxlan_fdb *f;
+
+ skb_reset_mac_header(skb);
+ eth = eth_hdr(skb);
+
+ 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 &&
+ skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
+ 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);
+ }
+#endif
+ }
+
+ f = vxlan_find_mac(vxlan, eth->h_dest);
+ did_rsc = false;
+
+ if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
+ (ntohs(eth->h_proto) == ETH_P_IP ||
+ ntohs(eth->h_proto) == ETH_P_IPV6)) {
+ did_rsc = route_shortcircuit(dev, skb);
+ if (did_rsc)
+ f = vxlan_find_mac(vxlan, eth->h_dest);
+ }
+
+ if (f == NULL) {
+ 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++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ }
+
+ list_for_each_entry_rcu(rdst, &f->remotes, list) {
+ struct sk_buff *skb1;
+
+ if (!fdst) {
+ fdst = rdst;
+ continue;
+ }
+ skb1 = skb_clone(skb, GFP_ATOMIC);
+ if (skb1)
+ vxlan_xmit_one(skb1, dev, rdst, did_rsc);
+ }
+
+ if (fdst)
+ vxlan_xmit_one(skb, dev, fdst, did_rsc);
+ else
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+/* 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;
+
+ 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);
+ unsigned long timeout;
+
+ if (f->state & NUD_PERMANENT)
+ continue;
+
+ timeout = f->used + vxlan->age_interval * HZ;
+ 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;
+ }
+ }
+ spin_unlock_bh(&vxlan->hash_lock);
+
+ mod_timer(&vxlan->age_timer, next_timer);
+}
+
+static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
+{
+ __u32 vni = vxlan->default_dst.remote_vni;
+
+ vxlan->vn_sock = vs;
+ hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
+}
+
+/* Setup stats when device is created */
+static int vxlan_init(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ struct vxlan_sock *vs;
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ spin_lock(&vn->sock_lock);
+ vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
+ if (vs) {
+ /* If we have a socket with same port already, reuse it */
+ atomic_inc(&vs->refcnt);
+ vxlan_vs_add_dev(vs, vxlan);
+ } else {
+ /* otherwise make new socket outside of RTNL */
+ dev_hold(dev);
+ queue_work(vxlan_wq, &vxlan->sock_work);
+ }
+ spin_unlock(&vn->sock_lock);
+
+ return 0;
+}
+
+static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
+{
+ 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);
+}
+
+static void vxlan_uninit(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_sock *vs = vxlan->vn_sock;
+
+ vxlan_fdb_delete_default(vxlan);
+
+ if (vs)
+ vxlan_sock_release(vs);
+ free_percpu(dev->tstats);
+}
+
+/* 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);
+ struct vxlan_sock *vs = vxlan->vn_sock;
+
+ /* socket hasn't been created */
+ if (!vs)
+ return -ENOTCONN;
+
+ if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
+ vxlan_sock_hold(vs);
+ dev_hold(dev);
+ queue_work(vxlan_wq, &vxlan->igmp_join);
+ }
+
+ if (vxlan->age_interval)
+ mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
+
+ return 0;
+}
+
+/* Purge the forwarding table */
+static void vxlan_flush(struct vxlan_dev *vxlan)
+{
+ unsigned int h;
+
+ 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);
+ /* the all_zeros_mac entry is deleted at vxlan_uninit */
+ if (!is_zero_ether_addr(f->eth_addr))
+ vxlan_fdb_destroy(vxlan, f);
+ }
+ }
+ 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);
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ struct vxlan_sock *vs = vxlan->vn_sock;
+
+ if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
+ !vxlan_group_used(vn, vxlan)) {
+ vxlan_sock_hold(vs);
+ dev_hold(dev);
+ queue_work(vxlan_wq, &vxlan->igmp_leave);
+ }
+
+ del_timer_sync(&vxlan->age_timer);
+
+ vxlan_flush(vxlan);
+
+ return 0;
+}
+
+/* Stub, nothing needs to be done. */
+static void vxlan_set_multicast_list(struct net_device *dev)
+{
+}
+
+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;
+ int max_mtu;
+
+ lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
+ if (lowerdev == NULL)
+ return eth_change_mtu(dev, new_mtu);
+
+ if (dst->remote_ip.sa.sa_family == AF_INET6)
+ max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
+ else
+ max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
+
+ if (new_mtu < 68 || new_mtu > max_mtu)
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static const struct net_device_ops vxlan_netdev_ops = {
+ .ndo_init = vxlan_init,
+ .ndo_uninit = vxlan_uninit,
+ .ndo_open = vxlan_open,
+ .ndo_stop = vxlan_stop,
+ .ndo_start_xmit = vxlan_xmit,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_set_rx_mode = vxlan_set_multicast_list,
+ .ndo_change_mtu = vxlan_change_mtu,
+ .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,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type vxlan_type = {
+ .name = "vxlan",
+};
+
+/* Calls the ndo_add_vxlan_port of the caller in order to
+ * supply the listening VXLAN udp ports. Callers are expected
+ * to implement the ndo_add_vxlan_port.
+ */
+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;
+ __be16 port;
+ unsigned int i;
+
+ spin_lock(&vn->sock_lock);
+ for (i = 0; i < PORT_HASH_SIZE; ++i) {
+ hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
+ port = inet_sk(vs->sock->sk)->inet_sport;
+ sa_family = vs->sock->sk->sk_family;
+ dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
+ port);
+ }
+ }
+ spin_unlock(&vn->sock_lock);
+}
+EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
+
+/* Initialize the device structure. */
+static void vxlan_setup(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ unsigned int h;
+ int low, high;
+
+ eth_hw_addr_random(dev);
+ ether_setup(dev);
+ if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
+ dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
+ else
+ dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
+
+ dev->netdev_ops = &vxlan_netdev_ops;
+ dev->destructor = free_netdev;
+ SET_NETDEV_DEVTYPE(dev, &vxlan_type);
+
+ dev->tx_queue_len = 0;
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+ dev->features |= NETIF_F_RXCSUM;
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+
+ dev->vlan_features = dev->features;
+ dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+
+ INIT_LIST_HEAD(&vxlan->next);
+ spin_lock_init(&vxlan->hash_lock);
+ INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
+ INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
+ INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
+
+ init_timer_deferrable(&vxlan->age_timer);
+ vxlan->age_timer.function = vxlan_cleanup;
+ vxlan->age_timer.data = (unsigned long) vxlan;
+
+ inet_get_local_port_range(dev_net(dev), &low, &high);
+ vxlan->port_min = low;
+ vxlan->port_max = high;
+ vxlan->dst_port = htons(vxlan_port);
+
+ vxlan->dev = dev;
+
+ 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 },
+ [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+ [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
+ [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
+ [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
+ [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
+ [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 },
+ [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
+ [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
+ [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
+ [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
+ [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
+ [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
+};
+
+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;
+ }
+
+ 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;
+ }
+ }
+
+ return 0;
+}
+
+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,
+};
+
+static void vxlan_del_work(struct work_struct *work)
+{
+ struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
+
+ sk_release_kernel(vs->sock->sk);
+ kfree_rcu(vs, rcu);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/* Create UDP socket for encapsulation receive. AF_INET6 socket
+ * could be used for both IPv4 and IPv6 communications, but
+ * users may set bindv6only=1.
+ */
+static struct socket *create_v6_sock(struct net *net, __be16 port, u32 flags)
+{
+ struct sock *sk;
+ struct socket *sock;
+ struct sockaddr_in6 vxlan_addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = port,
+ };
+ int rc, val = 1;
+
+ rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
+ if (rc < 0) {
+ pr_debug("UDPv6 socket create failed\n");
+ return ERR_PTR(rc);
+ }
+
+ /* Put in proper namespace */
+ sk = sock->sk;
+ sk_change_net(sk, net);
+
+ kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+ (char *)&val, sizeof(val));
+ rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
+ sizeof(struct sockaddr_in6));
+ if (rc < 0) {
+ pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
+ &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
+ sk_release_kernel(sk);
+ return ERR_PTR(rc);
+ }
+ /* At this point, IPv6 module should have been loaded in
+ * sock_create_kern().
+ */
+ BUG_ON(!ipv6_stub);
+
+ /* Disable multicast loopback */
+ inet_sk(sk)->mc_loop = 0;
+
+ if (flags & VXLAN_F_UDP_ZERO_CSUM6_TX)
+ udp_set_no_check6_tx(sk, true);
+
+ if (flags & VXLAN_F_UDP_ZERO_CSUM6_RX)
+ udp_set_no_check6_rx(sk, true);
+
+ return sock;
+}
+
+#else
+
+static struct socket *create_v6_sock(struct net *net, __be16 port, u32 flags)
+{
+ return ERR_PTR(-EPFNOSUPPORT);
+}
+#endif
+
+static struct socket *create_v4_sock(struct net *net, __be16 port, u32 flags)
+{
+ struct sock *sk;
+ struct socket *sock;
+ struct sockaddr_in vxlan_addr = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_ANY),
+ .sin_port = port,
+ };
+ int rc;
+
+ /* Create UDP socket for encapsulation receive. */
+ rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
+ if (rc < 0) {
+ pr_debug("UDP socket create failed\n");
+ return ERR_PTR(rc);
+ }
+
+ /* Put in proper namespace */
+ sk = sock->sk;
+ sk_change_net(sk, net);
+
+ rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
+ sizeof(vxlan_addr));
+ if (rc < 0) {
+ pr_debug("bind for UDP socket %pI4:%u (%d)\n",
+ &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
+ sk_release_kernel(sk);
+ return ERR_PTR(rc);
+ }
+
+ /* Disable multicast loopback */
+ inet_sk(sk)->mc_loop = 0;
+
+ if (!(flags & VXLAN_F_UDP_CSUM))
+ sock->sk->sk_no_check_tx = 1;
+
+ return sock;
+}
+
+/* Create new listen socket if needed */
+static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
+ vxlan_rcv_t *rcv, void *data,
+ u32 flags)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_sock *vs;
+ struct socket *sock;
+ struct sock *sk;
+ unsigned int h;
+ bool ipv6 = !!(flags & VXLAN_F_IPV6);
+
+ vs = kzalloc(sizeof(*vs), GFP_KERNEL);
+ 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);
+
+ if (ipv6)
+ sock = create_v6_sock(net, port, flags);
+ else
+ sock = create_v4_sock(net, port, flags);
+ if (IS_ERR(sock)) {
+ kfree(vs);
+ return ERR_CAST(sock);
+ }
+
+ vs->sock = sock;
+ sk = sock->sk;
+ atomic_set(&vs->refcnt, 1);
+ vs->rcv = rcv;
+ vs->data = data;
+ rcu_assign_sk_user_data(vs->sock->sk, vs);
+
+ /* 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;
+
+ spin_lock(&vn->sock_lock);
+ hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
+ vxlan_notify_add_rx_port(vs);
+ spin_unlock(&vn->sock_lock);
+
+ /* Mark socket as an encapsulation socket. */
+ udp_sk(sk)->encap_type = 1;
+ udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (ipv6)
+ ipv6_stub->udpv6_encap_enable();
+ else
+#endif
+ udp_encap_enable();
+
+ return vs;
+}
+
+struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
+ vxlan_rcv_t *rcv, void *data,
+ bool no_share, u32 flags)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_sock *vs;
+
+ vs = vxlan_socket_create(net, port, rcv, data, flags);
+ if (!IS_ERR(vs))
+ return vs;
+
+ if (no_share) /* Return error if sharing is not allowed. */
+ return vs;
+
+ spin_lock(&vn->sock_lock);
+ vs = vxlan_find_sock(net, port);
+ if (vs) {
+ if (vs->rcv == rcv)
+ atomic_inc(&vs->refcnt);
+ else
+ vs = ERR_PTR(-EBUSY);
+ }
+ spin_unlock(&vn->sock_lock);
+
+ if (!vs)
+ vs = ERR_PTR(-EINVAL);
+
+ return vs;
+}
+EXPORT_SYMBOL_GPL(vxlan_sock_add);
+
+/* Scheduled at device creation to bind to a socket */
+static void vxlan_sock_work(struct work_struct *work)
+{
+ struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
+ struct net *net = vxlan->net;
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ __be16 port = vxlan->dst_port;
+ struct vxlan_sock *nvs;
+
+ nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
+ spin_lock(&vn->sock_lock);
+ if (!IS_ERR(nvs))
+ vxlan_vs_add_dev(nvs, vxlan);
+ spin_unlock(&vn->sock_lock);
+
+ dev_put(vxlan->dev);
+}
+
+static int vxlan_newlink(struct net *net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ __u32 vni;
+ int err;
+ bool use_ipv6 = false;
+
+ if (!data[IFLA_VXLAN_ID])
+ return -EINVAL;
+
+ vxlan->net = dev_net(dev);
+
+ vni = nla_get_u32(data[IFLA_VXLAN_ID]);
+ dst->remote_vni = vni;
+
+ /* Unless IPv6 is explicitly requested, assume IPv4 */
+ dst->remote_ip.sa.sa_family = AF_INET;
+ if (data[IFLA_VXLAN_GROUP]) {
+ dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
+ } else if (data[IFLA_VXLAN_GROUP6]) {
+ if (!IS_ENABLED(CONFIG_IPV6))
+ return -EPFNOSUPPORT;
+
+ nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
+ sizeof(struct in6_addr));
+ dst->remote_ip.sa.sa_family = AF_INET6;
+ use_ipv6 = true;
+ }
+
+ if (data[IFLA_VXLAN_LOCAL]) {
+ vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
+ vxlan->saddr.sa.sa_family = AF_INET;
+ } else if (data[IFLA_VXLAN_LOCAL6]) {
+ if (!IS_ENABLED(CONFIG_IPV6))
+ return -EPFNOSUPPORT;
+
+ /* TODO: respect scope id */
+ nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
+ sizeof(struct in6_addr));
+ vxlan->saddr.sa.sa_family = AF_INET6;
+ use_ipv6 = true;
+ }
+
+ if (data[IFLA_VXLAN_LINK] &&
+ (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
+ struct net_device *lowerdev
+ = __dev_get_by_index(net, dst->remote_ifindex);
+
+ if (!lowerdev) {
+ pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
+ return -ENODEV;
+ }
+
+#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;
+ }
+ vxlan->flags |= VXLAN_F_IPV6;
+ }
+#endif
+
+ if (!tb[IFLA_MTU])
+ dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+
+ dev->needed_headroom = lowerdev->hard_header_len +
+ (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+ } else if (use_ipv6)
+ vxlan->flags |= VXLAN_F_IPV6;
+
+ if (data[IFLA_VXLAN_TOS])
+ vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
+
+ if (data[IFLA_VXLAN_TTL])
+ vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
+
+ if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
+ vxlan->flags |= VXLAN_F_LEARN;
+
+ if (data[IFLA_VXLAN_AGEING])
+ vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
+ else
+ vxlan->age_interval = FDB_AGE_DEFAULT;
+
+ if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
+ vxlan->flags |= VXLAN_F_PROXY;
+
+ if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
+ vxlan->flags |= VXLAN_F_RSC;
+
+ if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
+ vxlan->flags |= VXLAN_F_L2MISS;
+
+ if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
+ vxlan->flags |= VXLAN_F_L3MISS;
+
+ if (data[IFLA_VXLAN_LIMIT])
+ vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
+
+ if (data[IFLA_VXLAN_PORT_RANGE]) {
+ const struct ifla_vxlan_port_range *p
+ = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
+ vxlan->port_min = ntohs(p->low);
+ vxlan->port_max = ntohs(p->high);
+ }
+
+ if (data[IFLA_VXLAN_PORT])
+ vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
+
+ if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
+ vxlan->flags |= VXLAN_F_UDP_CSUM;
+
+ if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
+ nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
+ vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
+
+ if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
+ nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
+ vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
+
+ if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
+ pr_info("duplicate VNI %u\n", vni);
+ return -EEXIST;
+ }
+
+ 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->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;
+}
+
+static void vxlan_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+
+ spin_lock(&vn->sock_lock);
+ if (!hlist_unhashed(&vxlan->hlist))
+ hlist_del_rcu(&vxlan->hlist);
+ spin_unlock(&vn->sock_lock);
+
+ list_del(&vxlan->next);
+ 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 */
+ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
+ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
+ 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 */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
+ nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
+ 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 */
+ 0;
+}
+
+static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ const struct vxlan_dev *vxlan = netdev_priv(dev);
+ const struct vxlan_rdst *dst = &vxlan->default_dst;
+ struct ifla_vxlan_port_range ports = {
+ .low = htons(vxlan->port_min),
+ .high = htons(vxlan->port_max),
+ };
+
+ if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
+ goto nla_put_failure;
+
+ if (!vxlan_addr_any(&dst->remote_ip)) {
+ if (dst->remote_ip.sa.sa_family == AF_INET) {
+ if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
+ dst->remote_ip.sin.sin_addr.s_addr))
+ goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
+ &dst->remote_ip.sin6.sin6_addr))
+ goto nla_put_failure;
+#endif
+ }
+ }
+
+ if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
+ goto nla_put_failure;
+
+ if (!vxlan_addr_any(&vxlan->saddr)) {
+ if (vxlan->saddr.sa.sa_family == AF_INET) {
+ if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
+ vxlan->saddr.sin.sin_addr.s_addr))
+ goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
+ &vxlan->saddr.sin6.sin6_addr))
+ goto nla_put_failure;
+#endif
+ }
+ }
+
+ if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
+ nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
+ 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)) ||
+ nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
+ nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
+ nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
+ 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,
+ !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
+ goto nla_put_failure;
+
+ if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+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,
+};
+
+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);
+ struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
+
+ if (event == NETDEV_UNREGISTER)
+ vxlan_handle_lowerdev_unregister(vn, dev);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block vxlan_notifier_block __read_mostly = {
+ .notifier_call = vxlan_lowerdev_event,
+};
+
+static __net_init int vxlan_init_net(struct net *net)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ unsigned int h;
+
+ INIT_LIST_HEAD(&vn->vxlan_list);
+ spin_lock_init(&vn->sock_lock);
+
+ for (h = 0; h < PORT_HASH_SIZE; ++h)
+ INIT_HLIST_HEAD(&vn->sock_list[h]);
+
+ return 0;
+}
+
+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.
+ */
+ if (!net_eq(dev_net(vxlan->dev), net))
+ unregister_netdevice_queue(dev, &list);
+ }
+
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations vxlan_net_ops = {
+ .init = vxlan_init_net,
+ .exit = vxlan_exit_net,
+ .id = &vxlan_net_id,
+ .size = sizeof(struct vxlan_net),
+};
+
+static int __init vxlan_init_module(void)
+{
+ int rc;
+
+ vxlan_wq = alloc_workqueue("vxlan", 0, 0);
+ if (!vxlan_wq)
+ return -ENOMEM;
+
+ get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
+
+ rc = register_pernet_subsys(&vxlan_net_ops);
+ if (rc)
+ goto out1;
+
+ rc = register_netdevice_notifier(&vxlan_notifier_block);
+ if (rc)
+ goto out2;
+
+ rc = rtnl_link_register(&vxlan_link_ops);
+ if (rc)
+ goto out3;
+
+ return 0;
+out3:
+ unregister_netdevice_notifier(&vxlan_notifier_block);
+out2:
+ unregister_pernet_subsys(&vxlan_net_ops);
+out1:
+ destroy_workqueue(vxlan_wq);
+ return rc;
+}
+late_initcall(vxlan_init_module);
+
+static void __exit vxlan_cleanup_module(void)
+{
+ rtnl_link_unregister(&vxlan_link_ops);
+ unregister_netdevice_notifier(&vxlan_notifier_block);
+ destroy_workqueue(vxlan_wq);
+ unregister_pernet_subsys(&vxlan_net_ops);
+ /* rcu_barrier() is called by netns */
+}
+module_exit(vxlan_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(VXLAN_VERSION);
+MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
+MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
+MODULE_ALIAS_RTNL_LINK("vxlan");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 13:25:52 +0000