2012-10-01 06:32:35 -06:00
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/*
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* VXLAN: Virtual eXtensiable Local Area Network
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*
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* Copyright (c) 2012 Vyatta Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* TODO
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* - use IANA UDP port number (when defined)
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* - IPv6 (not in RFC)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/rculist.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/hash.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/rtnetlink.h>
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#include <net/route.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#define VXLAN_VERSION "0.1"
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#define VNI_HASH_BITS 10
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#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
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#define FDB_HASH_BITS 8
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#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
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#define FDB_AGE_DEFAULT 300 /* 5 min */
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#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
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#define VXLAN_N_VID (1u << 24)
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#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
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/* VLAN + IP header + UDP + VXLAN */
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#define VXLAN_HEADROOM (4 + 20 + 8 + 8)
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#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
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/* VXLAN protocol header */
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struct vxlanhdr {
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__be32 vx_flags;
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__be32 vx_vni;
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};
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/* UDP port for VXLAN traffic. */
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static unsigned int vxlan_port __read_mostly = 8472;
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module_param_named(udp_port, vxlan_port, uint, 0444);
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MODULE_PARM_DESC(udp_port, "Destination UDP port");
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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/* per-net private data for this module */
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static unsigned int vxlan_net_id;
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struct vxlan_net {
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struct socket *sock; /* UDP encap socket */
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struct hlist_head vni_list[VNI_HASH_SIZE];
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};
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/* Forwarding table entry */
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struct vxlan_fdb {
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struct hlist_node hlist; /* linked list of entries */
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struct rcu_head rcu;
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unsigned long updated; /* jiffies */
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unsigned long used;
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__be32 remote_ip;
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u16 state; /* see ndm_state */
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u8 eth_addr[ETH_ALEN];
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};
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/* Per-cpu network traffic stats */
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struct vxlan_stats {
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u64 rx_packets;
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u64 rx_bytes;
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u64 tx_packets;
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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};
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/* Pseudo network device */
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struct vxlan_dev {
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struct hlist_node hlist;
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struct net_device *dev;
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struct vxlan_stats __percpu *stats;
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__u32 vni; /* virtual network id */
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__be32 gaddr; /* multicast group */
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__be32 saddr; /* source address */
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unsigned int link; /* link to multicast over */
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2012-10-09 14:35:50 -06:00
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__u16 port_min; /* source port range */
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__u16 port_max;
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2012-10-01 06:32:35 -06:00
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__u8 tos; /* TOS override */
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__u8 ttl;
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bool learn;
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unsigned long age_interval;
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struct timer_list age_timer;
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spinlock_t hash_lock;
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unsigned int addrcnt;
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unsigned int addrmax;
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unsigned int addrexceeded;
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struct hlist_head fdb_head[FDB_HASH_SIZE];
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};
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/* salt for hash table */
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static u32 vxlan_salt __read_mostly;
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static inline struct hlist_head *vni_head(struct net *net, u32 id)
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{
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struct vxlan_net *vn = net_generic(net, vxlan_net_id);
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return &vn->vni_list[hash_32(id, VNI_HASH_BITS)];
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}
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/* Look up VNI in a per net namespace table */
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static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id)
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{
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struct vxlan_dev *vxlan;
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struct hlist_node *node;
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hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) {
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if (vxlan->vni == id)
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return vxlan;
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}
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return NULL;
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}
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/* Fill in neighbour message in skbuff. */
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static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
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const struct vxlan_fdb *fdb,
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u32 portid, u32 seq, int type, unsigned int flags)
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{
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unsigned long now = jiffies;
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struct nda_cacheinfo ci;
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struct nlmsghdr *nlh;
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struct ndmsg *ndm;
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nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
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if (nlh == NULL)
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return -EMSGSIZE;
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ndm = nlmsg_data(nlh);
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memset(ndm, 0, sizeof(*ndm));
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ndm->ndm_family = AF_BRIDGE;
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ndm->ndm_state = fdb->state;
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ndm->ndm_ifindex = vxlan->dev->ifindex;
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ndm->ndm_flags = NTF_SELF;
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ndm->ndm_type = NDA_DST;
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if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
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goto nla_put_failure;
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if (nla_put_be32(skb, NDA_DST, fdb->remote_ip))
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goto nla_put_failure;
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ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
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ci.ndm_confirmed = 0;
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ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
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ci.ndm_refcnt = 0;
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if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
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goto nla_put_failure;
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static inline size_t vxlan_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg))
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+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
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+ nla_total_size(sizeof(__be32)) /* NDA_DST */
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+ nla_total_size(sizeof(struct nda_cacheinfo));
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}
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static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
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const struct vxlan_fdb *fdb, int type)
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{
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struct net *net = dev_net(vxlan->dev);
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
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if (skb == NULL)
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goto errout;
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err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0);
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if (err < 0) {
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/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
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return;
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errout:
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if (err < 0)
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rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
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}
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/* Hash Ethernet address */
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static u32 eth_hash(const unsigned char *addr)
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{
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u64 value = get_unaligned((u64 *)addr);
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/* only want 6 bytes */
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#ifdef __BIG_ENDIAN
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value >>= 16;
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2012-10-09 14:35:47 -06:00
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#else
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value <<= 16;
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2012-10-01 06:32:35 -06:00
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#endif
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return hash_64(value, FDB_HASH_BITS);
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}
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/* Hash chain to use given mac address */
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static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
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const u8 *mac)
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{
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return &vxlan->fdb_head[eth_hash(mac)];
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}
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/* Look up Ethernet address in forwarding table */
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static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
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const u8 *mac)
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{
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struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
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struct vxlan_fdb *f;
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struct hlist_node *node;
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hlist_for_each_entry_rcu(f, node, head, hlist) {
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if (compare_ether_addr(mac, f->eth_addr) == 0)
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return f;
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}
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return NULL;
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}
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/* Add new entry to forwarding table -- assumes lock held */
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static int vxlan_fdb_create(struct vxlan_dev *vxlan,
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const u8 *mac, __be32 ip,
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__u16 state, __u16 flags)
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{
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struct vxlan_fdb *f;
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int notify = 0;
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f = vxlan_find_mac(vxlan, mac);
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if (f) {
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if (flags & NLM_F_EXCL) {
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netdev_dbg(vxlan->dev,
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"lost race to create %pM\n", mac);
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return -EEXIST;
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}
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if (f->state != state) {
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f->state = state;
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f->updated = jiffies;
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notify = 1;
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}
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} else {
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if (!(flags & NLM_F_CREATE))
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return -ENOENT;
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if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
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return -ENOSPC;
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netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
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f = kmalloc(sizeof(*f), GFP_ATOMIC);
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if (!f)
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return -ENOMEM;
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notify = 1;
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f->remote_ip = ip;
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f->state = state;
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f->updated = f->used = jiffies;
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memcpy(f->eth_addr, mac, ETH_ALEN);
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++vxlan->addrcnt;
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hlist_add_head_rcu(&f->hlist,
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vxlan_fdb_head(vxlan, mac));
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}
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if (notify)
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vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
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return 0;
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}
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static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
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{
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netdev_dbg(vxlan->dev,
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"delete %pM\n", f->eth_addr);
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--vxlan->addrcnt;
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vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
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hlist_del_rcu(&f->hlist);
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kfree_rcu(f, rcu);
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}
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/* Add static entry (via netlink) */
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static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
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struct net_device *dev,
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const unsigned char *addr, u16 flags)
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{
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struct vxlan_dev *vxlan = netdev_priv(dev);
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__be32 ip;
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int err;
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if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
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pr_info("RTM_NEWNEIGH with invalid state %#x\n",
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ndm->ndm_state);
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return -EINVAL;
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}
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if (tb[NDA_DST] == NULL)
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return -EINVAL;
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if (nla_len(tb[NDA_DST]) != sizeof(__be32))
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return -EAFNOSUPPORT;
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ip = nla_get_be32(tb[NDA_DST]);
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spin_lock_bh(&vxlan->hash_lock);
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err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags);
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spin_unlock_bh(&vxlan->hash_lock);
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return err;
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}
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/* Delete entry (via netlink) */
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static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev,
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const unsigned char *addr)
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{
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struct vxlan_dev *vxlan = netdev_priv(dev);
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struct vxlan_fdb *f;
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int err = -ENOENT;
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spin_lock_bh(&vxlan->hash_lock);
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f = vxlan_find_mac(vxlan, addr);
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|
|
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));
|
|
|
|
|
|
|
|
/* 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);
|
|
|
|
|
|
|
|
/* 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);
|
2012-10-09 14:35:52 -06:00
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2012-10-09 14:35:46 -06:00
|
|
|
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;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2012-10-09 14:35:49 -06:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2012-10-09 14:35:50 -06:00
|
|
|
/* 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 u16 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 (((u64) hash * range) >> 32) + vxlan->port_min;
|
|
|
|
}
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
/* Transmit local packets over Vxlan
|
|
|
|
*
|
|
|
|
* Outer IP header inherits ECN and DF from inner header.
|
|
|
|
* Outer UDP destination is the VXLAN assigned port.
|
2012-10-09 14:35:50 -06:00
|
|
|
* source port is based on hash of flow
|
2012-10-01 06:32:35 -06:00
|
|
|
*/
|
|
|
|
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;
|
|
|
|
__be32 dst;
|
2012-10-09 14:35:50 -06:00
|
|
|
__u16 src_port;
|
2012-10-01 06:32:35 -06:00
|
|
|
__be16 df = 0;
|
|
|
|
__u8 tos, ttl;
|
|
|
|
int err;
|
|
|
|
|
2012-10-09 14:35:46 -06:00
|
|
|
dst = vxlan_find_dst(vxlan, skb);
|
|
|
|
if (!dst)
|
|
|
|
goto drop;
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
/* 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);
|
|
|
|
|
2012-10-09 14:35:50 -06:00
|
|
|
src_port = vxlan_src_port(vxlan, skb);
|
2012-10-01 06:32:35 -06:00
|
|
|
|
2012-10-09 14:35:48 -06:00
|
|
|
memset(&fl4, 0, sizeof(fl4));
|
|
|
|
fl4.flowi4_oif = vxlan->link;
|
|
|
|
fl4.flowi4_tos = RT_TOS(tos);
|
|
|
|
fl4.daddr = dst;
|
|
|
|
fl4.saddr = vxlan->saddr;
|
|
|
|
|
|
|
|
rt = ip_route_output_key(dev_net(dev), &fl4);
|
2012-10-01 06:32:35 -06:00
|
|
|
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);
|
2012-10-09 14:35:50 -06:00
|
|
|
uh->source = htons(src_port);
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
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);
|
2012-10-09 14:35:48 -06:00
|
|
|
iph->daddr = dst;
|
2012-10-01 06:32:35 -06:00
|
|
|
iph->saddr = fl4.saddr;
|
|
|
|
iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
|
|
|
|
|
2012-10-09 14:35:49 -06:00
|
|
|
vxlan_set_owner(dev, skb);
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
/* 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;
|
|
|
|
|
2012-10-26 00:24:34 -06:00
|
|
|
if (f->state & NUD_PERMANENT)
|
2012-10-01 06:32:35 -06:00
|
|
|
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;
|
2012-10-09 14:35:50 -06:00
|
|
|
int low, high;
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
eth_hw_addr_random(dev);
|
|
|
|
ether_setup(dev);
|
2012-10-09 14:35:51 -06:00
|
|
|
dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2012-10-09 14:35:50 -06:00
|
|
|
inet_get_local_port_range(&low, &high);
|
|
|
|
vxlan->port_min = low;
|
|
|
|
vxlan->port_max = high;
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
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 },
|
2012-10-09 14:35:50 -06:00
|
|
|
[IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
|
2012-10-01 06:32:35 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
2012-10-09 14:35:50 -06:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
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]);
|
|
|
|
|
2012-10-09 14:35:53 -06:00
|
|
|
if (data[IFLA_VXLAN_LINK] &&
|
|
|
|
(vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
|
|
|
|
struct net_device *lowerdev
|
|
|
|
= __dev_get_by_index(net, vxlan->link);
|
|
|
|
|
|
|
|
if (!lowerdev) {
|
|
|
|
pr_info("ifindex %d does not exist\n", vxlan->link);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
2012-10-01 06:32:35 -06:00
|
|
|
|
2012-10-09 14:35:53 -06:00
|
|
|
if (!tb[IFLA_MTU])
|
2012-10-01 06:32:35 -06:00
|
|
|
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]);
|
|
|
|
|
2012-10-09 14:35:50 -06:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
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 */
|
2012-10-09 14:35:50 -06:00
|
|
|
nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
|
2012-10-01 06:32:35 -06:00
|
|
|
0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
|
|
{
|
|
|
|
const struct vxlan_dev *vxlan = netdev_priv(dev);
|
2012-10-09 14:35:50 -06:00
|
|
|
struct ifla_vxlan_port_range ports = {
|
|
|
|
.low = htons(vxlan->port_min),
|
|
|
|
.high = htons(vxlan->port_max),
|
|
|
|
};
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni))
|
|
|
|
goto nla_put_failure;
|
|
|
|
|
2012-10-08 15:55:30 -06:00
|
|
|
if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr))
|
2012-10-01 06:32:35 -06:00
|
|
|
goto nla_put_failure;
|
|
|
|
|
|
|
|
if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link))
|
|
|
|
goto nla_put_failure;
|
|
|
|
|
2012-10-08 15:55:30 -06:00
|
|
|
if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
|
2012-10-01 06:32:35 -06:00
|
|
|
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;
|
|
|
|
|
2012-10-09 14:35:50 -06:00
|
|
|
if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
|
|
|
|
goto nla_put_failure;
|
|
|
|
|
2012-10-01 06:32:35 -06:00
|
|
|
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;
|
|
|
|
}
|
2012-10-01 12:49:21 -06:00
|
|
|
/* Put in proper namespace */
|
|
|
|
sk = vn->sock->sk;
|
|
|
|
sk_change_net(sk, net);
|
2012-10-01 06:32:35 -06:00
|
|
|
|
|
|
|
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);
|
2012-10-01 12:49:21 -06:00
|
|
|
sk_release_kernel(sk);
|
2012-10-01 06:32:35 -06:00
|
|
|
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) {
|
2012-10-01 12:49:21 -06:00
|
|
|
sk_release_kernel(vn->sock->sk);
|
2012-10-01 06:32:35 -06:00
|
|
|
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");
|