diff options
Diffstat (limited to 'drivers/net/vxlan.c')
| -rw-r--r-- | drivers/net/vxlan.c | 1929 |
1 files changed, 0 insertions, 1929 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c deleted file mode 100644 index 0ba1e7edbb1b..000000000000 --- a/drivers/net/vxlan.c +++ /dev/null @@ -1,1929 +0,0 @@ -/* - * 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 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) -/* 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 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 UDP socket information */ -struct vxlan_sock { - struct hlist_node hlist; - struct rcu_head rcu; - struct work_struct del_work; - atomic_t refcnt; - struct socket *sock; - struct hlist_head vni_list[VNI_HASH_SIZE]; -}; - -/* 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; -}; - -struct vxlan_rdst { - __be32 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 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 */ - - struct work_struct sock_work; - struct work_struct igmp_work; - - 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 struct workqueue_struct *vxlan_wq; - -static void vxlan_sock_work(struct work_struct *work); - -/* 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(struct vxlan_fdb *fdb) -{ - return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list); -} - -/* Find VXLAN socket based on network namespace and UDP port */ -static struct vxlan_sock *vxlan_find_port(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; -} - -/* 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; - struct vxlan_dev *vxlan; - - vs = vxlan_find_port(net, port); - if (!vs) - return NULL; - - hlist_for_each_entry_rcu(vxlan, vni_head(vs, 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_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(__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, - 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, first_remote(fdb)); - 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 = { - .state = NUD_STALE, - }; - struct vxlan_rdst remote = { - .remote_ip = ipa, /* goes to NDA_DST */ - .remote_vni = VXLAN_N_VID, - }; - - INIT_LIST_HEAD(&f.remotes); - list_add_rcu(&remote.list, &f.remotes); - - 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 = { - .state = NUD_STALE, - }; - - INIT_LIST_HEAD(&f.remotes); - 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; -} - -/* caller should hold vxlan->hash_lock */ -static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, - __be32 ip, __be16 port, - __u32 vni, __u32 ifindex) -{ - struct vxlan_rdst *rd; - - list_for_each_entry(rd, &f->remotes, list) { - if (rd->remote_ip == ip && - rd->remote_port == port && - rd->remote_vni == vni && - rd->remote_ifindex == ifindex) - return rd; - } - - return NULL; -} - -/* 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; - - 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); - - 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) || - is_zero_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->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); - - ++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_rdst(struct rcu_head *head) -{ - struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); - kfree(rd); -} - -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, 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, - __be32 *ip, __be16 *port, u32 *vni, u32 *ifindex) -{ - struct net *net = dev_net(vxlan->dev); - - if (tb[NDA_DST]) { - if (nla_len(tb[NDA_DST]) != sizeof(__be32)) - return -EAFNOSUPPORT; - - *ip = nla_get_be32(tb[NDA_DST]); - } else { - *ip = htonl(INADDR_ANY); - } - - 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; - } - - 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); */ - __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; - - err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); - if (err) - return err; - - 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; - __be32 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 (ip != htonl(INADDR_ANY)) { - 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); - call_rcu(&rd->rcu, vxlan_fdb_free_rdst); - 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, - __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)) { - struct vxlan_rdst *rdst = first_remote(f); - - if (likely(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 %pI4 to %pI4\n", - src_mac, &rdst->remote_ip, &src_ip); - - rdst->remote_ip = src_ip; - f->updated = jiffies; - vxlan_fdb_notify(vxlan, f, 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, __be32 remote_ip) -{ - struct vxlan_dev *vxlan; - - list_for_each_entry(vxlan, &vn->vxlan_list, next) { - if (!netif_running(vxlan->dev)) - continue; - - if (vxlan->default_dst.remote_ip == remote_ip) - return true; - } - - return false; -} - -static void vxlan_sock_hold(struct vxlan_sock *vs) -{ - atomic_inc(&vs->refcnt); -} - -static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs) -{ - if (!atomic_dec_and_test(&vs->refcnt)) - return; - - spin_lock(&vn->sock_lock); - hlist_del_rcu(&vs->hlist); - spin_unlock(&vn->sock_lock); - - queue_work(vxlan_wq, &vs->del_work); -} - -/* Callback to update multicast group membership. - * Scheduled when vxlan goes up/down. - */ -static void vxlan_igmp_work(struct work_struct *work) -{ - struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work); - struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id); - struct vxlan_sock *vs = vxlan->vn_sock; - struct sock *sk = vs->sock->sk; - struct ip_mreqn mreq = { - .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, - .imr_ifindex = vxlan->default_dst.remote_ifindex, - }; - - lock_sock(sk); - if (vxlan_group_used(vn, vxlan->default_dst.remote_ip)) - ip_mc_join_group(sk, &mreq); - else - ip_mc_leave_group(sk, &mreq); - release_sock(sk); - - vxlan_sock_release(vn, 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 iphdr *oip; - struct vxlanhdr *vxh; - struct vxlan_dev *vxlan; - struct pcpu_tstats *stats; - __be16 port; - __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; - port = inet_sk(sk)->inet_sport; - vxlan = vxlan_find_vni(sock_net(sk), vni, port); - if (!vxlan) { - netdev_dbg(skb->dev, "unknown vni %d port %u\n", - vni, ntohs(port)); - 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 && first_remote(f)->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); - - 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_put(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_dev *vxlan = netdev_priv(dev); - struct sock *sk = vxlan->vn_sock->sock->sk; - - skb_orphan(skb); - sock_hold(sk); - skb->sk = sk; - skb->destructor = vxlan_sock_put; -} - -/* 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 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; - const struct iphdr *old_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; - int err; - - 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; - } - 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, dst_port); - if (!dst_vxlan) - goto tx_error; - vxlan_encap_bypass(skb, vxlan, dst_vxlan); - return; - } - 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; - - vxlan_set_owner(dev, skb); - - if (handle_offloads(skb)) - goto drop; - - tos = ip_tunnel_ecn_encap(tos, old_iph, skb); - ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); - - err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst, - IPPROTO_UDP, tos, ttl, df); - iptunnel_xmit_stats(err, &dev->stats, dev->tstats); - - return; - -drop: - dev->stats.tx_dropped++; - goto tx_free; - -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; - struct vxlan_fdb *f; - - 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) { - 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++; - dev_kfree_skb(skb); - return NETDEV_TX_OK; - } - } - - list_for_each_entry_rcu(rdst, &f->remotes, list) { - struct sk_buff *skb1; - - skb1 = skb_clone(skb, GFP_ATOMIC); - if (skb1) - vxlan_xmit_one(skb1, dev, rdst, did_rsc); - } - - dev_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); -} - -/* 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(dev_net(dev), vxlan_net_id); - struct vxlan_sock *vs; - __u32 vni = vxlan->default_dst.remote_vni; - - dev->tstats = alloc_percpu(struct pcpu_tstats); - if (!dev->tstats) - return -ENOMEM; - - spin_lock(&vn->sock_lock); - vs = vxlan_find_port(dev_net(dev), vxlan->dst_port); - if (vs) { - /* If we have a socket with same port already, reuse it */ - atomic_inc(&vs->refcnt); - vxlan->vn_sock = vs; - hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); - } 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_net *vn = net_generic(dev_net(dev), vxlan_net_id); - struct vxlan_sock *vs = vxlan->vn_sock; - - vxlan_fdb_delete_default(vxlan); - - if (vs) - vxlan_sock_release(vn, 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 (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { - vxlan_sock_hold(vs); - dev_hold(dev); - queue_work(vxlan_wq, &vxlan->igmp_work); - } - - 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_sock *vs = vxlan->vn_sock; - - if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { - vxlan_sock_hold(vs); - dev_hold(dev); - queue_work(vxlan_wq, &vxlan->igmp_work); - } - - 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_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 = 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", -}; - -/* 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); - dev->hard_header_len = 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_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; - - INIT_LIST_HEAD(&vxlan->next); - spin_lock_init(&vxlan->hash_lock); - INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work); - 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(&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 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); -} - -static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port) -{ - struct vxlan_sock *vs; - struct sock *sk; - struct sockaddr_in vxlan_addr = { - .sin_family = AF_INET, - .sin_addr.s_addr = htonl(INADDR_ANY), - .sin_port = port, - }; - int rc; - unsigned int h; - - vs = kmalloc(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); - - /* Create UDP socket for encapsulation receive. */ - rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock); - if (rc < 0) { - pr_debug("UDP socket create failed\n"); - kfree(vs); - return ERR_PTR(rc); - } - - /* Put in proper namespace */ - sk = vs->sock->sk; - sk_change_net(sk, net); - - rc = kernel_bind(vs->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); - kfree(vs); - return ERR_PTR(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(); - atomic_set(&vs->refcnt, 1); - - return vs; -} - -/* 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_device *dev = vxlan->dev; - struct net *net = dev_net(dev); - __u32 vni = vxlan->default_dst.remote_vni; - __be16 port = vxlan->dst_port; - struct vxlan_net *vn = net_generic(net, vxlan_net_id); - struct vxlan_sock *nvs, *ovs; - - nvs = vxlan_socket_create(net, port); - if (IS_ERR(nvs)) { - netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n", - PTR_ERR(nvs)); - goto out; - } - - spin_lock(&vn->sock_lock); - /* Look again to see if can reuse socket */ - ovs = vxlan_find_port(net, port); - if (ovs) { - atomic_inc(&ovs->refcnt); - vxlan->vn_sock = ovs; - hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni)); - spin_unlock(&vn->sock_lock); - - sk_release_kernel(nvs->sock->sk); - kfree(nvs); - } else { - vxlan->vn_sock = nvs; - hlist_add_head_rcu(&nvs->hlist, vs_head(net, port)); - hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni)); - spin_unlock(&vn->sock_lock); - } -out: - dev_put(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; - - if (!data[IFLA_VXLAN_ID]) - return -EINVAL; - - vni = nla_get_u32(data[IFLA_VXLAN_ID]); - 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->hard_header_len = 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]); - - if (vxlan_find_vni(net, vni, vxlan->dst_port)) { - pr_info("duplicate VNI %u\n", vni); - return -EEXIST; - } - - SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); - - /* create an fdb entry for default destination */ - 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); - - hlist_del_rcu(&vxlan->hlist); - 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(__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); - 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 __net_exit void vxlan_exit_net(struct net *net) -{ - struct vxlan_net *vn = net_generic(net, vxlan_net_id); - struct vxlan_dev *vxlan; - - rtnl_lock(); - list_for_each_entry(vxlan, &vn->vxlan_list, next) - dev_close(vxlan->dev); - 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_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: - destroy_workqueue(vxlan_wq); - return rc; -} -late_initcall(vxlan_init_module); - -static void __exit vxlan_cleanup_module(void) -{ - rtnl_link_unregister(&vxlan_link_ops); - destroy_workqueue(vxlan_wq); - 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"); |