| /* |
| * VXLAN: Virtual eXtensiable Local Area Network |
| * |
| * Copyright (c) 2012 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 |
| * - use IANA UDP port number (when defined) |
| * - 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 <net/ip.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) |
| /* VLAN + IP header + UDP + VXLAN */ |
| #define VXLAN_HEADROOM (4 + 20 + 8 + 8) |
| |
| #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. */ |
| 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]; |
| }; |
| |
| /* 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; |
| __be32 remote_ip; |
| u16 state; /* see ndm_state */ |
| u8 eth_addr[ETH_ALEN]; |
| }; |
| |
| /* Per-cpu network traffic stats */ |
| struct vxlan_stats { |
| u64 rx_packets; |
| u64 rx_bytes; |
| u64 tx_packets; |
| u64 tx_bytes; |
| struct u64_stats_sync syncp; |
| }; |
| |
| /* Pseudo network device */ |
| struct vxlan_dev { |
| struct hlist_node hlist; |
| struct net_device *dev; |
| struct vxlan_stats __percpu *stats; |
| __u32 vni; /* virtual network id */ |
| __be32 gaddr; /* multicast group */ |
| __be32 saddr; /* source address */ |
| unsigned int link; /* link to multicast over */ |
| __u8 tos; /* TOS override */ |
| __u8 ttl; |
| bool learn; |
| |
| unsigned long age_interval; |
| struct timer_list age_timer; |
| spinlock_t hash_lock; |
| unsigned int addrcnt; |
| unsigned int addrmax; |
| unsigned int addrexceeded; |
| |
| struct hlist_head fdb_head[FDB_HASH_SIZE]; |
| }; |
| |
| /* 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; |
| struct hlist_node *node; |
| |
| hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) { |
| if (vxlan->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) |
| { |
| unsigned long now = jiffies; |
| struct nda_cacheinfo ci; |
| struct nlmsghdr *nlh; |
| struct ndmsg *ndm; |
| |
| nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| ndm = nlmsg_data(nlh); |
| memset(ndm, 0, sizeof(*ndm)); |
| ndm->ndm_family = AF_BRIDGE; |
| ndm->ndm_state = fdb->state; |
| ndm->ndm_ifindex = vxlan->dev->ifindex; |
| ndm->ndm_flags = NTF_SELF; |
| ndm->ndm_type = NDA_DST; |
| |
| if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
| goto nla_put_failure; |
| |
| if (nla_put_be32(skb, NDA_DST, fdb->remote_ip)) |
| 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(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); |
| 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); |
| } |
| |
| /* 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; |
| struct hlist_node *node; |
| |
| hlist_for_each_entry_rcu(f, node, head, hlist) { |
| if (compare_ether_addr(mac, f->eth_addr) == 0) |
| return f; |
| } |
| |
| return NULL; |
| } |
| |
| /* 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) |
| { |
| 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; |
| } |
| } 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_ip = ip; |
| f->state = state; |
| 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_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); |
| kfree_rcu(f, rcu); |
| } |
| |
| /* 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); |
| __be32 ip; |
| 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]); |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags); |
| spin_unlock_bh(&vxlan->hash_lock); |
| |
| return err; |
| } |
| |
| /* Delete entry (via netlink) */ |
| static int vxlan_fdb_delete(struct ndmsg *ndm, 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; |
| struct hlist_node *n; |
| int err; |
| |
| hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) { |
| 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); |
| if (err < 0) |
| break; |
| skip: |
| ++idx; |
| } |
| } |
| |
| return idx; |
| } |
| |
| /* Watch incoming packets to learn mapping between Ethernet address |
| * and Tunnel endpoint. |
| */ |
| static void vxlan_snoop(struct net_device *dev, |
| __be32 src_ip, const u8 *src_mac) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb *f; |
| int err; |
| |
| f = vxlan_find_mac(vxlan, src_mac); |
| if (likely(f)) { |
| f->used = jiffies; |
| if (likely(f->remote_ip == src_ip)) |
| return; |
| |
| if (net_ratelimit()) |
| netdev_info(dev, |
| "%pM migrated from %pI4 to %pI4\n", |
| src_mac, &f->remote_ip, &src_ip); |
| |
| f->remote_ip = src_ip; |
| f->updated = jiffies; |
| } else { |
| /* learned new entry */ |
| spin_lock(&vxlan->hash_lock); |
| err = vxlan_fdb_create(vxlan, src_mac, src_ip, |
| NUD_REACHABLE, |
| NLM_F_EXCL|NLM_F_CREATE); |
| spin_unlock(&vxlan->hash_lock); |
| } |
| } |
| |
| |
| /* 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; |
| struct hlist_node *node; |
| unsigned h; |
| |
| for (h = 0; h < VNI_HASH_SIZE; ++h) |
| hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) { |
| if (vxlan == this) |
| continue; |
| |
| if (!netif_running(vxlan->dev)) |
| continue; |
| |
| if (vxlan->gaddr == this->gaddr) |
| 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->gaddr, |
| }; |
| 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->gaddr, |
| }; |
| |
| /* 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 vxlan_stats *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)); |
| skb_postpull_rcsum(skb, eth_hdr(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; |
| } |
| |
| /* Re-examine inner Ethernet packet */ |
| oip = ip_hdr(skb); |
| skb->protocol = eth_type_trans(skb, vxlan->dev); |
| skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| |
| /* Ignore packet loops (and multicast echo) */ |
| if (compare_ether_addr(eth_hdr(skb)->h_source, |
| vxlan->dev->dev_addr) == 0) |
| goto drop; |
| |
| if (vxlan->learn) |
| vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); |
| |
| __skb_tunnel_rx(skb, vxlan->dev); |
| skb_reset_network_header(skb); |
| |
| 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->stats); |
| 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; |
| } |
| |
| /* Extract dsfield from inner protocol */ |
| static inline u8 vxlan_get_dsfield(const struct iphdr *iph, |
| const struct sk_buff *skb) |
| { |
| if (skb->protocol == htons(ETH_P_IP)) |
| return iph->tos; |
| else if (skb->protocol == htons(ETH_P_IPV6)) |
| return ipv6_get_dsfield((const struct ipv6hdr *)iph); |
| else |
| return 0; |
| } |
| |
| /* Propogate ECN bits out */ |
| static inline u8 vxlan_ecn_encap(u8 tos, |
| const struct iphdr *iph, |
| const struct sk_buff *skb) |
| { |
| u8 inner = vxlan_get_dsfield(iph, skb); |
| |
| return INET_ECN_encapsulate(tos, inner); |
| } |
| |
| static __be32 vxlan_find_dst(struct vxlan_dev *vxlan, struct sk_buff *skb) |
| { |
| const struct ethhdr *eth = (struct ethhdr *) skb->data; |
| const struct vxlan_fdb *f; |
| |
| if (is_multicast_ether_addr(eth->h_dest)) |
| return vxlan->gaddr; |
| |
| f = vxlan_find_mac(vxlan, eth->h_dest); |
| if (f) |
| return f->remote_ip; |
| else |
| return vxlan->gaddr; |
| |
| } |
| |
| /* 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 if available |
| * otherwise use a random value |
| */ |
| static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| 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; |
| unsigned int pkt_len = skb->len; |
| u32 hash; |
| __be32 dst; |
| __be16 df = 0; |
| __u8 tos, ttl; |
| int err; |
| |
| dst = vxlan_find_dst(vxlan, skb); |
| if (!dst) |
| goto drop; |
| |
| /* 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 = vxlan_get_dsfield(old_iph, skb); |
| |
| hash = skb_get_rxhash(skb); |
| |
| rt = ip_route_output_gre(dev_net(dev), &fl4, dst, |
| vxlan->saddr, vxlan->vni, |
| RT_TOS(tos), vxlan->link); |
| 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; |
| } |
| |
| 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(vxlan->vni << 8); |
| |
| __skb_push(skb, sizeof(*uh)); |
| skb_reset_transport_header(skb); |
| uh = udp_hdr(skb); |
| |
| uh->dest = htons(vxlan_port); |
| uh->source = hash ? :random32(); |
| |
| 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 = vxlan_ecn_encap(tos, old_iph, skb); |
| iph->daddr = fl4.daddr; |
| iph->saddr = fl4.saddr; |
| iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
| |
| /* See __IPTUNNEL_XMIT */ |
| skb->ip_summed = CHECKSUM_NONE; |
| ip_select_ident(iph, &rt->dst, NULL); |
| |
| err = ip_local_out(skb); |
| if (likely(net_xmit_eval(err) == 0)) { |
| struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats); |
| |
| u64_stats_update_begin(&stats->syncp); |
| stats->tx_packets++; |
| stats->tx_bytes += pkt_len; |
| u64_stats_update_end(&stats->syncp); |
| } else { |
| dev->stats.tx_errors++; |
| dev->stats.tx_aborted_errors++; |
| } |
| 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; |
| } |
| |
| /* 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); |
| |
| vxlan->stats = alloc_percpu(struct vxlan_stats); |
| if (!vxlan->stats) |
| 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 (vxlan->gaddr) { |
| 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 (vxlan->gaddr) |
| vxlan_leave_group(dev); |
| |
| del_timer_sync(&vxlan->age_timer); |
| |
| vxlan_flush(vxlan); |
| |
| return 0; |
| } |
| |
| /* Merge per-cpu statistics */ |
| static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, |
| struct rtnl_link_stats64 *stats) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_stats tmp, sum = { 0 }; |
| unsigned int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| unsigned int start; |
| const struct vxlan_stats *stats |
| = per_cpu_ptr(vxlan->stats, cpu); |
| |
| do { |
| start = u64_stats_fetch_begin_bh(&stats->syncp); |
| memcpy(&tmp, stats, sizeof(tmp)); |
| } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); |
| |
| sum.tx_bytes += tmp.tx_bytes; |
| sum.tx_packets += tmp.tx_packets; |
| sum.rx_bytes += tmp.rx_bytes; |
| sum.rx_packets += tmp.rx_packets; |
| } |
| |
| stats->tx_bytes = sum.tx_bytes; |
| stats->tx_packets = sum.tx_packets; |
| stats->rx_bytes = sum.rx_bytes; |
| stats->rx_packets = sum.rx_packets; |
| |
| stats->multicast = dev->stats.multicast; |
| stats->rx_length_errors = dev->stats.rx_length_errors; |
| stats->rx_frame_errors = dev->stats.rx_frame_errors; |
| stats->rx_errors = dev->stats.rx_errors; |
| |
| stats->tx_dropped = dev->stats.tx_dropped; |
| stats->tx_carrier_errors = dev->stats.tx_carrier_errors; |
| stats->tx_aborted_errors = dev->stats.tx_aborted_errors; |
| stats->collisions = dev->stats.collisions; |
| stats->tx_errors = dev->stats.tx_errors; |
| |
| return stats; |
| } |
| |
| /* 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 = vxlan_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) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| |
| free_percpu(vxlan->stats); |
| free_netdev(dev); |
| } |
| |
| /* Initialize the device structure. */ |
| static void vxlan_setup(struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| unsigned h; |
| |
| eth_hw_addr_random(dev); |
| ether_setup(dev); |
| |
| 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->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
| |
| 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; |
| |
| 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 }, |
| }; |
| |
| 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_GROUP]) { |
| __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); |
| if (!IN_MULTICAST(ntohl(gaddr))) { |
| pr_debug("group address is not IPv4 multicast\n"); |
| return -EADDRNOTAVAIL; |
| } |
| } |
| return 0; |
| } |
| |
| static int vxlan_newlink(struct net *net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[]) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| __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; |
| } |
| vxlan->vni = vni; |
| |
| if (data[IFLA_VXLAN_GROUP]) |
| vxlan->gaddr = 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]) { |
| vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]); |
| |
| if (!tb[IFLA_MTU]) { |
| struct net_device *lowerdev; |
| lowerdev = __dev_get_by_index(net, vxlan->link); |
| dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
| } |
| } |
| |
| if (data[IFLA_VXLAN_TOS]) |
| vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); |
| |
| if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
| vxlan->learn = true; |
| |
| 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_LIMIT]) |
| vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); |
| |
| err = register_netdevice(dev); |
| if (!err) |
| hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->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(__u32)) + /* IFLA_VXLAN_AGEING */ |
| nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ |
| 0; |
| } |
| |
| static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| const struct vxlan_dev *vxlan = netdev_priv(dev); |
| |
| if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) |
| goto nla_put_failure; |
| |
| if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
| goto nla_put_failure; |
| |
| if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) |
| 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->learn) || |
| nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
| nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) |
| 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); |
| |
| 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); |
| } |
| module_exit(vxlan_cleanup_module); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION(VXLAN_VERSION); |
| MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); |
| MODULE_ALIAS_RTNL_LINK("vxlan"); |