diff options
Diffstat (limited to 'drivers/net/vxlan.c')
| -rw-r--r-- | drivers/net/vxlan.c | 1704 |
1 files changed, 1704 insertions, 0 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c new file mode 100644 index 00000000..a1dc186c --- /dev/null +++ b/drivers/net/vxlan.c @@ -0,0 +1,1704 @@ +/* + * 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. + * + * TODO + * - IPv6 (not in RFC) + */ + +#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/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> + +#define VXLAN_VERSION "0.1" + +#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) +/* IP header + UDP + VXLAN + Ethernet header */ +#define VXLAN_HEADROOM (20 + 8 + 8 + 14) + +#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 compatability with early adopters. + */ +static unsigned int vxlan_port __read_mostly = 8472; +module_param_named(udp_port, vxlan_port, uint, 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"); + +/* per-net private data for this module */ +static unsigned int vxlan_net_id; +struct vxlan_net { + struct socket *sock; /* UDP encap socket */ + struct hlist_head vni_list[VNI_HASH_SIZE]; +}; + +struct vxlan_rdst { + struct rcu_head rcu; + __be32 remote_ip; + __be16 remote_port; + u32 remote_vni; + u32 remote_ifindex; + struct vxlan_rdst *remote_next; +}; + +/* 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 vxlan_rdst remote; + 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; + struct net_device *dev; + struct vxlan_rdst default_dst; /* default destination */ + __be32 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_* below */ + + 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]; +}; + +#define VXLAN_F_LEARN 0x01 +#define VXLAN_F_PROXY 0x02 +#define VXLAN_F_RSC 0x04 +#define VXLAN_F_L2MISS 0x08 +#define VXLAN_F_L3MISS 0x10 + +/* salt for hash table */ +static u32 vxlan_salt __read_mostly; + +static inline struct hlist_head *vni_head(struct net *net, u32 id) +{ + struct vxlan_net *vn = net_generic(net, vxlan_net_id); + + return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; +} + +/* Look up VNI in a per net namespace table */ +static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) +{ + struct vxlan_dev *vxlan; + + hlist_for_each_entry_rcu(vxlan, vni_head(net, id), hlist) { + if (vxlan->default_dst.remote_vni == id) + return vxlan; + } + + return NULL; +} + +/* 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 = rdst->remote_ip != htonl(INADDR_ANY); + 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 = NDA_DST; + + if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) + goto nla_put_failure; + + if (send_ip && nla_put_be32(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_be32(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(__be32)) /* 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, + const struct vxlan_fdb *fdb, 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, &fdb->remote); + 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, __be32 ipa) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct vxlan_fdb f; + + memset(&f, 0, sizeof f); + f.state = NUD_STALE; + f.remote.remote_ip = ipa; /* goes to NDA_DST */ + f.remote.remote_vni = VXLAN_N_VID; + + vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); +} + +static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) +{ + struct vxlan_fdb f; + + memset(&f, 0, sizeof f); + f.state = NUD_STALE; + memcpy(f.eth_addr, eth_addr, ETH_ALEN); + + vxlan_fdb_notify(vxlan, &f, 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 (compare_ether_addr(mac, f->eth_addr) == 0) + 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; +} + +/* Add/update destinations for multicast */ +static int vxlan_fdb_append(struct vxlan_fdb *f, + __be32 ip, __be16 port, __u32 vni, __u32 ifindex) +{ + struct vxlan_rdst *rd_prev, *rd; + + rd_prev = NULL; + for (rd = &f->remote; rd; rd = rd->remote_next) { + if (rd->remote_ip == ip && + rd->remote_port == port && + rd->remote_vni == vni && + rd->remote_ifindex == ifindex) + return 0; + rd_prev = rd; + } + 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; + rd->remote_next = NULL; + rd_prev->remote_next = rd; + return 1; +} + +/* Add new entry to forwarding table -- assumes lock held */ +static int vxlan_fdb_create(struct vxlan_dev *vxlan, + const u8 *mac, __be32 ip, + __u16 state, __u16 flags, + __be16 port, __u32 vni, __u32 ifindex, + __u8 ndm_flags) +{ + 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_APPEND) && + is_multicast_ether_addr(f->eth_addr)) { + int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); + + if (rc < 0) + return rc; + notify |= rc; + } + } else { + if (!(flags & NLM_F_CREATE)) + return -ENOENT; + + if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) + return -ENOSPC; + + netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); + f = kmalloc(sizeof(*f), GFP_ATOMIC); + if (!f) + return -ENOMEM; + + notify = 1; + f->remote.remote_ip = ip; + f->remote.remote_port = port; + f->remote.remote_vni = vni; + f->remote.remote_ifindex = ifindex; + f->remote.remote_next = NULL; + f->state = state; + f->flags = ndm_flags; + f->updated = f->used = jiffies; + memcpy(f->eth_addr, mac, ETH_ALEN); + + ++vxlan->addrcnt; + hlist_add_head_rcu(&f->hlist, + vxlan_fdb_head(vxlan, mac)); + } + + if (notify) + vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); + + return 0; +} + +static void vxlan_fdb_free(struct rcu_head *head) +{ + struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); + + while (f->remote.remote_next) { + struct vxlan_rdst *rd = f->remote.remote_next; + + f->remote.remote_next = rd->remote_next; + 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, RTM_DELNEIGH); + + hlist_del_rcu(&f->hlist); + call_rcu(&f->rcu, vxlan_fdb_free); +} + +/* 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); + __be32 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; + + if (nla_len(tb[NDA_DST]) != sizeof(__be32)) + return -EAFNOSUPPORT; + + ip = nla_get_be32(tb[NDA_DST]); + + 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; + dev_put(tdev); + } else + ifindex = 0; + + 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; + int err = -ENOENT; + + spin_lock_bh(&vxlan->hash_lock); + f = vxlan_find_mac(vxlan, addr); + if (f) { + vxlan_fdb_destroy(vxlan, f); + err = 0; + } + 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; + for (rd = &f->remote; rd; rd = rd->remote_next) { + if (idx < cb->args[0]) + goto skip; + + 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) + break; +skip: + ++idx; + } + } + } + + 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, + __be32 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)) { + if (likely(f->remote.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 %pI4 to %pI4\n", + src_mac, &f->remote.remote_ip, &src_ip); + + f->remote.remote_ip = src_ip; + f->updated = jiffies; + } 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, + const struct vxlan_dev *this) +{ + const struct vxlan_dev *vxlan; + unsigned h; + + for (h = 0; h < VNI_HASH_SIZE; ++h) + hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) { + if (vxlan == this) + continue; + + if (!netif_running(vxlan->dev)) + continue; + + if (vxlan->default_dst.remote_ip == this->default_dst.remote_ip) + return true; + } + + return false; +} + +/* kernel equivalent to IP_ADD_MEMBERSHIP */ +static int vxlan_join_group(struct net_device *dev) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); + struct sock *sk = vn->sock->sk; + struct ip_mreqn mreq = { + .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, + .imr_ifindex = vxlan->default_dst.remote_ifindex, + }; + int err; + + /* Already a member of group */ + if (vxlan_group_used(vn, vxlan)) + return 0; + + /* Need to drop RTNL to call multicast join */ + rtnl_unlock(); + lock_sock(sk); + err = ip_mc_join_group(sk, &mreq); + release_sock(sk); + rtnl_lock(); + + return err; +} + + +/* kernel equivalent to IP_DROP_MEMBERSHIP */ +static int vxlan_leave_group(struct net_device *dev) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); + int err = 0; + struct sock *sk = vn->sock->sk; + struct ip_mreqn mreq = { + .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, + .imr_ifindex = vxlan->default_dst.remote_ifindex, + }; + + /* Only leave group when last vxlan is done. */ + if (vxlan_group_used(vn, vxlan)) + return 0; + + /* Need to drop RTNL to call multicast leave */ + rtnl_unlock(); + lock_sock(sk); + err = ip_mc_leave_group(sk, &mreq); + release_sock(sk); + rtnl_lock(); + + return err; +} + +/* Callback from net/ipv4/udp.c to receive packets */ +static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) +{ + struct iphdr *oip; + struct vxlanhdr *vxh; + struct vxlan_dev *vxlan; + struct pcpu_tstats *stats; + __u32 vni; + int err; + + /* pop off outer UDP header */ + __skb_pull(skb, sizeof(struct udphdr)); + + /* Need Vxlan and inner Ethernet header to be present */ + if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) + goto error; + + /* Drop packets with reserved bits set */ + vxh = (struct vxlanhdr *) skb->data; + 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; + } + + __skb_pull(skb, sizeof(struct vxlanhdr)); + + /* Is this VNI defined? */ + vni = ntohl(vxh->vx_vni) >> 8; + vxlan = vxlan_find_vni(sock_net(sk), vni); + if (!vxlan) { + netdev_dbg(skb->dev, "unknown vni %d\n", vni); + goto drop; + } + + if (!pskb_may_pull(skb, ETH_HLEN)) { + vxlan->dev->stats.rx_length_errors++; + vxlan->dev->stats.rx_errors++; + goto drop; + } + + skb_reset_mac_header(skb); + + /* Re-examine inner Ethernet packet */ + oip = ip_hdr(skb); + skb->protocol = eth_type_trans(skb, vxlan->dev); + + /* Ignore packet loops (and multicast echo) */ + if (compare_ether_addr(eth_hdr(skb)->h_source, + vxlan->dev->dev_addr) == 0) + goto drop; + + if ((vxlan->flags & VXLAN_F_LEARN) && + vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source)) + goto drop; + + __skb_tunnel_rx(skb, vxlan->dev); + skb_reset_network_header(skb); + + /* If the NIC driver gave us an encapsulated packet with + * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, + * leave the CHECKSUM_UNNECESSARY, the device checksummed it + * for us. Otherwise force the upper layers to verify it. + */ + if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || + !(vxlan->dev->features & NETIF_F_RXCSUM)) + skb->ip_summed = CHECKSUM_NONE; + + skb->encapsulation = 0; + + err = IP_ECN_decapsulate(oip, skb); + if (unlikely(err)) { + if (log_ecn_error) + 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 0; +error: + /* Put UDP header back */ + __skb_push(skb, sizeof(struct udphdr)); + + return 1; +drop: + /* Consume bad packet */ + kfree_skb(skb); + return 0; +} + +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 && f->remote.remote_ip == htonl(INADDR_ANY)) { + /* 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) + vxlan_ip_miss(dev, tip); +out: + consume_skb(skb); + return NETDEV_TX_OK; +} + +static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct neighbour *n; + struct iphdr *pip; + + 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: + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + return false; + pip = ip_hdr(skb); + n = neigh_lookup(&arp_tbl, &pip->daddr, dev); + break; + default: + return false; + } + + if (n) { + bool diff; + + diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; + 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; + } else if (vxlan->flags & VXLAN_F_L3MISS) + vxlan_ip_miss(dev, pip->daddr); + return false; +} + +static void vxlan_sock_free(struct sk_buff *skb) +{ + sock_put(skb->sk); +} + +/* On transmit, associate with the tunnel socket */ +static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) +{ + struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); + struct sock *sk = vn->sock->sk; + + skb_orphan(skb); + sock_hold(sk); + skb->sk = sk; + skb->destructor = vxlan_sock_free; +} + +/* 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 + */ +static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) +{ + unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; + u32 hash; + + hash = skb_get_rxhash(skb); + if (!hash) + hash = jhash(skb->data, 2 * ETH_ALEN, + (__force u32) skb->protocol); + + return htons((((u64) hash * range) >> 32) + vxlan->port_min); +} + +static int handle_offloads(struct sk_buff *skb) +{ + if (skb_is_gso(skb)) { + int err = skb_unclone(skb, GFP_ATOMIC); + if (unlikely(err)) + return err; + + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; + } else if (skb->ip_summed != CHECKSUM_PARTIAL) + skb->ip_summed = CHECKSUM_NONE; + + return 0; +} + +/* 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_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); + struct pcpu_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 (dst_vxlan->flags & VXLAN_F_LEARN) + vxlan_snoop(skb->dev, htonl(INADDR_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 netdev_tx_t 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; + const struct iphdr *old_iph; + struct iphdr *iph; + struct vxlanhdr *vxh; + struct udphdr *uh; + struct flowi4 fl4; + __be32 dst; + __be16 src_port, dst_port; + u32 vni; + __be16 df = 0; + __u8 tos, ttl; + + dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; + vni = rdst->remote_vni; + dst = rdst->remote_ip; + + if (!dst) { + if (did_rsc) { + /* short-circuited back to local bridge */ + vxlan_encap_bypass(skb, vxlan, vxlan); + return NETDEV_TX_OK; + } + goto drop; + } + + if (!skb->encapsulation) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + + /* Need space for new headers (invalidates iph ptr) */ + if (skb_cow_head(skb, VXLAN_HEADROOM)) + goto drop; + + old_iph = ip_hdr(skb); + + ttl = vxlan->ttl; + if (!ttl && IN_MULTICAST(ntohl(dst))) + ttl = 1; + + tos = vxlan->tos; + if (tos == 1) + tos = ip_tunnel_get_dsfield(old_iph, skb); + + src_port = vxlan_src_port(vxlan, skb); + + memset(&fl4, 0, sizeof(fl4)); + fl4.flowi4_oif = rdst->remote_ifindex; + fl4.flowi4_tos = RT_TOS(tos); + fl4.daddr = dst; + fl4.saddr = vxlan->saddr; + + rt = ip_route_output_key(dev_net(dev), &fl4); + if (IS_ERR(rt)) { + netdev_dbg(dev, "no route to %pI4\n", &dst); + dev->stats.tx_carrier_errors++; + goto tx_error; + } + + if (rt->dst.dev == dev) { + netdev_dbg(dev, "circular route to %pI4\n", &dst); + ip_rt_put(rt); + dev->stats.collisions++; + goto 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(dev_net(dev), vni); + if (!dst_vxlan) + goto tx_error; + vxlan_encap_bypass(skb, vxlan, dst_vxlan); + return NETDEV_TX_OK; + } + + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); + IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | + IPSKB_REROUTED); + skb_dst_drop(skb); + skb_dst_set(skb, &rt->dst); + + vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); + vxh->vx_flags = htonl(VXLAN_FLAGS); + vxh->vx_vni = htonl(vni << 8); + + __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); + uh->check = 0; + + __skb_push(skb, sizeof(*iph)); + skb_reset_network_header(skb); + iph = ip_hdr(skb); + iph->version = 4; + iph->ihl = sizeof(struct iphdr) >> 2; + iph->frag_off = df; + iph->protocol = IPPROTO_UDP; + iph->tos = ip_tunnel_ecn_encap(tos, old_iph, skb); + iph->daddr = dst; + iph->saddr = fl4.saddr; + iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); + __ip_select_ident(iph, skb_shinfo(skb)->gso_segs ?: 1); + + nf_reset(skb); + + vxlan_set_owner(dev, skb); + + if (handle_offloads(skb)) + goto drop; + + iptunnel_xmit(skb, dev); + return NETDEV_TX_OK; + +drop: + dev->stats.tx_dropped++; + goto tx_free; + +tx_error: + dev->stats.tx_errors++; +tx_free: + dev_kfree_skb(skb); + return NETDEV_TX_OK; +} + +/* 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 *rdst0, *rdst; + struct vxlan_fdb *f; + int rc1, rc; + + skb_reset_mac_header(skb); + eth = eth_hdr(skb); + + if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) + return arp_reduce(dev, skb); + + 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) { + did_rsc = route_shortcircuit(dev, skb); + if (did_rsc) + f = vxlan_find_mac(vxlan, eth->h_dest); + } + + if (f == NULL) { + rdst0 = &vxlan->default_dst; + + if (rdst0->remote_ip == htonl(INADDR_ANY) && + (vxlan->flags & VXLAN_F_L2MISS) && + !is_multicast_ether_addr(eth->h_dest)) + vxlan_fdb_miss(vxlan, eth->h_dest); + } else + rdst0 = &f->remote; + + rc = NETDEV_TX_OK; + + /* if there are multiple destinations, send copies */ + for (rdst = rdst0->remote_next; rdst; rdst = rdst->remote_next) { + struct sk_buff *skb1; + + skb1 = skb_clone(skb, GFP_ATOMIC); + if (skb1) { + rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc); + if (rc == NETDEV_TX_OK) + rc = rc1; + } + } + + rc1 = vxlan_xmit_one(skb, dev, rdst0, did_rsc); + if (rc == NETDEV_TX_OK) + rc = rc1; + return rc; +} + +/* 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); +} + +/* Setup stats when device is created */ +static int vxlan_init(struct net_device *dev) +{ + dev->tstats = alloc_percpu(struct pcpu_tstats); + if (!dev->tstats) + return -ENOMEM; + + return 0; +} + +/* 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); + int err; + + if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { + err = vxlan_join_group(dev); + if (err) + return err; + } + + 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 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); + 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); + + if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) + vxlan_leave_group(dev); + + 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 const struct net_device_ops vxlan_netdev_ops = { + .ndo_init = vxlan_init, + .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 = eth_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", +}; + +static void vxlan_free(struct net_device *dev) +{ + free_percpu(dev->tstats); + free_netdev(dev); +} + +/* Initialize the device structure. */ +static void vxlan_setup(struct net_device *dev) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + unsigned h; + int low, high; + + eth_hw_addr_random(dev); + ether_setup(dev); + dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM; + + dev->netdev_ops = &vxlan_netdev_ops; + dev->destructor = vxlan_free; + SET_NETDEV_DEVTYPE(dev, &vxlan_type); + + dev->tx_queue_len = 0; + dev->features |= NETIF_F_LLTX; + dev->features |= NETIF_F_NETNS_LOCAL; + dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; + dev->features |= NETIF_F_RXCSUM; + dev->features |= NETIF_F_GSO_SOFTWARE; + + dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; + dev->hw_features |= NETIF_F_GSO_SOFTWARE; + dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; + dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; + + 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; + + inet_get_local_port_range(&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_LINK] = { .type = NLA_U32 }, + [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, + [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 int vxlan_newlink(struct net *net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct vxlan_rdst *dst = &vxlan->default_dst; + __u32 vni; + int err; + + if (!data[IFLA_VXLAN_ID]) + return -EINVAL; + + vni = nla_get_u32(data[IFLA_VXLAN_ID]); + if (vxlan_find_vni(net, vni)) { + pr_info("duplicate VNI %u\n", vni); + return -EEXIST; + } + dst->remote_vni = vni; + + if (data[IFLA_VXLAN_GROUP]) + dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]); + + if (data[IFLA_VXLAN_LOCAL]) + vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); + + 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 (!tb[IFLA_MTU]) + dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; + + /* update header length based on lower device */ + dev->needed_headroom = lowerdev->hard_header_len + + VXLAN_HEADROOM; + } + + 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]); + + SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); + + err = register_netdevice(dev); + if (!err) + hlist_add_head_rcu(&vxlan->hlist, vni_head(net, dst->remote_vni)); + + return err; +} + +static void vxlan_dellink(struct net_device *dev, struct list_head *head) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + + hlist_del_rcu(&vxlan->hlist); + + 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(__be32)) +/* IFLA_VXLAN_GROUP */ + nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ + nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ + 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 */ + 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 (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip)) + goto nla_put_failure; + + if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) + goto nla_put_failure; + + if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) + goto nla_put_failure; + + 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)) + 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 __net_init int vxlan_init_net(struct net *net) +{ + struct vxlan_net *vn = net_generic(net, vxlan_net_id); + struct sock *sk; + struct sockaddr_in vxlan_addr = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + }; + int rc; + unsigned h; + + /* Create UDP socket for encapsulation receive. */ + rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); + if (rc < 0) { + pr_debug("UDP socket create failed\n"); + return rc; + } + /* Put in proper namespace */ + sk = vn->sock->sk; + sk_change_net(sk, net); + + vxlan_addr.sin_port = htons(vxlan_port); + + rc = kernel_bind(vn->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); + vn->sock = NULL; + return rc; + } + + /* Disable multicast loopback */ + inet_sk(sk)->mc_loop = 0; + + /* Mark socket as an encapsulation socket. */ + udp_sk(sk)->encap_type = 1; + udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; + udp_encap_enable(); + + for (h = 0; h < VNI_HASH_SIZE; ++h) + INIT_HLIST_HEAD(&vn->vni_list[h]); + + return 0; +} + +static __net_exit void vxlan_exit_net(struct net *net) +{ + struct vxlan_net *vn = net_generic(net, vxlan_net_id); + struct vxlan_dev *vxlan; + unsigned h; + + rtnl_lock(); + for (h = 0; h < VNI_HASH_SIZE; ++h) + hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) + dev_close(vxlan->dev); + rtnl_unlock(); + + if (vn->sock) { + sk_release_kernel(vn->sock->sk); + vn->sock = NULL; + } +} + +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; + + get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); + + rc = register_pernet_device(&vxlan_net_ops); + if (rc) + goto out1; + + rc = rtnl_link_register(&vxlan_link_ops); + if (rc) + goto out2; + + return 0; + +out2: + unregister_pernet_device(&vxlan_net_ops); +out1: + return rc; +} +module_init(vxlan_init_module); + +static void __exit vxlan_cleanup_module(void) +{ + rtnl_link_unregister(&vxlan_link_ops); + unregister_pernet_device(&vxlan_net_ops); + rcu_barrier(); +} +module_exit(vxlan_cleanup_module); + +MODULE_LICENSE("GPL"); +MODULE_VERSION(VXLAN_VERSION); +MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); +MODULE_ALIAS_RTNL_LINK("vxlan"); |