| /* |
| * 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, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 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->hard_header_len = 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->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]); |
| |
| 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"); |