mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
2896 lines
72 KiB
C
2896 lines
72 KiB
C
/*
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* VXLAN: Virtual eXtensible Local Area Network
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*
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* Copyright (c) 2012-2013 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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#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/if_vlan.h>
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#include <linux/hash.h>
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#include <linux/ethtool.h>
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#include <net/arp.h>
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#include <net/ndisc.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.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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#include <net/vxlan.h>
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#include <net/protocol.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#endif
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#define VXLAN_VERSION "0.1"
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#define PORT_HASH_BITS 8
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#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
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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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#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
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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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* The IANA assigned port is 4789, but the Linux default is 8472
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* for compatibility with early adopters.
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*/
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static unsigned short vxlan_port __read_mostly = 8472;
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module_param_named(udp_port, vxlan_port, ushort, 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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static int vxlan_net_id;
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static const u8 all_zeros_mac[ETH_ALEN];
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/* per-network namespace private data for this module */
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struct vxlan_net {
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struct list_head vxlan_list;
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struct hlist_head sock_list[PORT_HASH_SIZE];
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spinlock_t sock_lock;
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};
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union vxlan_addr {
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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struct sockaddr sa;
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};
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struct vxlan_rdst {
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union vxlan_addr remote_ip;
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__be16 remote_port;
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u32 remote_vni;
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u32 remote_ifindex;
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struct list_head list;
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struct rcu_head rcu;
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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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struct list_head remotes;
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u16 state; /* see ndm_state */
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u8 flags; /* see ndm_flags */
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u8 eth_addr[ETH_ALEN];
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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; /* vni hash table */
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struct list_head next; /* vxlan's per namespace list */
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struct vxlan_sock *vn_sock; /* listening socket */
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struct net_device *dev;
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struct net *net; /* netns for packet i/o */
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struct vxlan_rdst default_dst; /* default destination */
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union vxlan_addr saddr; /* source address */
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__be16 dst_port;
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__u16 port_min; /* source port range */
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__u16 port_max;
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__u8 tos; /* TOS override */
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__u8 ttl;
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u32 flags; /* VXLAN_F_* in vxlan.h */
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struct work_struct sock_work;
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struct work_struct igmp_join;
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struct work_struct igmp_leave;
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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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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 struct workqueue_struct *vxlan_wq;
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static void vxlan_sock_work(struct work_struct *work);
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#if IS_ENABLED(CONFIG_IPV6)
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static inline
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bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
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{
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if (a->sa.sa_family != b->sa.sa_family)
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return false;
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if (a->sa.sa_family == AF_INET6)
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return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
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else
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return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
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}
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static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
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{
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if (ipa->sa.sa_family == AF_INET6)
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return ipv6_addr_any(&ipa->sin6.sin6_addr);
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else
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return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
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}
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static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
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{
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if (ipa->sa.sa_family == AF_INET6)
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return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
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else
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return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
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}
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static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
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{
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if (nla_len(nla) >= sizeof(struct in6_addr)) {
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nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
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ip->sa.sa_family = AF_INET6;
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return 0;
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} else if (nla_len(nla) >= sizeof(__be32)) {
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ip->sin.sin_addr.s_addr = nla_get_be32(nla);
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ip->sa.sa_family = AF_INET;
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return 0;
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} else {
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return -EAFNOSUPPORT;
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}
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}
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static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
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const union vxlan_addr *ip)
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{
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if (ip->sa.sa_family == AF_INET6)
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return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
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else
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return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
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}
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#else /* !CONFIG_IPV6 */
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static inline
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bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
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{
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return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
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}
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static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
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{
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return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
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}
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static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
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{
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return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
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}
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static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
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{
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if (nla_len(nla) >= sizeof(struct in6_addr)) {
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return -EAFNOSUPPORT;
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} else if (nla_len(nla) >= sizeof(__be32)) {
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ip->sin.sin_addr.s_addr = nla_get_be32(nla);
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ip->sa.sa_family = AF_INET;
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return 0;
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} else {
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return -EAFNOSUPPORT;
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}
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}
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static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
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const union vxlan_addr *ip)
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{
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return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
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}
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#endif
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/* Virtual Network hash table head */
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static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
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{
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return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
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}
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/* Socket hash table head */
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static inline struct hlist_head *vs_head(struct net *net, __be16 port)
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{
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struct vxlan_net *vn = net_generic(net, vxlan_net_id);
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return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
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}
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/* First remote destination for a forwarding entry.
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* Guaranteed to be non-NULL because remotes are never deleted.
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*/
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static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
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{
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return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
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}
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static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
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{
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return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
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}
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/* Find VXLAN socket based on network namespace and UDP port */
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static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
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{
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struct vxlan_sock *vs;
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hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
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if (inet_sk(vs->sock->sk)->inet_sport == port)
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return vs;
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}
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return NULL;
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}
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static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
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{
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struct vxlan_dev *vxlan;
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hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
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if (vxlan->default_dst.remote_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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/* 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, __be16 port)
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{
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struct vxlan_sock *vs;
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vs = vxlan_find_sock(net, port);
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if (!vs)
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return NULL;
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return vxlan_vs_find_vni(vs, id);
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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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const struct vxlan_rdst *rdst)
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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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bool send_ip, send_eth;
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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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send_eth = send_ip = true;
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if (type == RTM_GETNEIGH) {
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ndm->ndm_family = AF_INET;
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send_ip = !vxlan_addr_any(&rdst->remote_ip);
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send_eth = !is_zero_ether_addr(fdb->eth_addr);
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} else
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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 = fdb->flags;
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ndm->ndm_type = RTN_UNICAST;
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if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
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goto nla_put_failure;
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if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
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goto nla_put_failure;
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if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
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nla_put_be16(skb, NDA_PORT, rdst->remote_port))
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goto nla_put_failure;
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if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
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nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
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goto nla_put_failure;
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if (rdst->remote_ifindex &&
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nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
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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(struct in6_addr)) /* NDA_DST */
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+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
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+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
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+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
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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, struct vxlan_fdb *fdb,
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struct vxlan_rdst *rd, 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, rd);
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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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static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
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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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.state = NUD_STALE,
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};
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struct vxlan_rdst remote = {
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.remote_ip = *ipa, /* goes to NDA_DST */
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.remote_vni = VXLAN_N_VID,
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};
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vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
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}
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|
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static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
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{
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struct vxlan_fdb f = {
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.state = NUD_STALE,
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};
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struct vxlan_rdst remote = { };
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memcpy(f.eth_addr, eth_addr, ETH_ALEN);
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vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
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}
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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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|
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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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#else
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value <<= 16;
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#endif
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return hash_64(value, FDB_HASH_BITS);
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}
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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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|
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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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|
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hlist_for_each_entry_rcu(f, head, hlist) {
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if (ether_addr_equal(mac, f->eth_addr))
|
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return f;
|
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}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
|
|
const u8 *mac)
|
|
{
|
|
struct vxlan_fdb *f;
|
|
|
|
f = __vxlan_find_mac(vxlan, mac);
|
|
if (f)
|
|
f->used = jiffies;
|
|
|
|
return f;
|
|
}
|
|
|
|
/* caller should hold vxlan->hash_lock */
|
|
static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
|
|
union vxlan_addr *ip, __be16 port,
|
|
__u32 vni, __u32 ifindex)
|
|
{
|
|
struct vxlan_rdst *rd;
|
|
|
|
list_for_each_entry(rd, &f->remotes, list) {
|
|
if (vxlan_addr_equal(&rd->remote_ip, ip) &&
|
|
rd->remote_port == port &&
|
|
rd->remote_vni == vni &&
|
|
rd->remote_ifindex == ifindex)
|
|
return rd;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Replace destination of unicast mac */
|
|
static int vxlan_fdb_replace(struct vxlan_fdb *f,
|
|
union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
|
|
{
|
|
struct vxlan_rdst *rd;
|
|
|
|
rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
|
|
if (rd)
|
|
return 0;
|
|
|
|
rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
|
|
if (!rd)
|
|
return 0;
|
|
rd->remote_ip = *ip;
|
|
rd->remote_port = port;
|
|
rd->remote_vni = vni;
|
|
rd->remote_ifindex = ifindex;
|
|
return 1;
|
|
}
|
|
|
|
/* Add/update destinations for multicast */
|
|
static int vxlan_fdb_append(struct vxlan_fdb *f,
|
|
union vxlan_addr *ip, __be16 port, __u32 vni,
|
|
__u32 ifindex, struct vxlan_rdst **rdp)
|
|
{
|
|
struct vxlan_rdst *rd;
|
|
|
|
rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
|
|
if (rd)
|
|
return 0;
|
|
|
|
rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
|
|
if (rd == NULL)
|
|
return -ENOBUFS;
|
|
rd->remote_ip = *ip;
|
|
rd->remote_port = port;
|
|
rd->remote_vni = vni;
|
|
rd->remote_ifindex = ifindex;
|
|
|
|
list_add_tail_rcu(&rd->list, &f->remotes);
|
|
|
|
*rdp = rd;
|
|
return 1;
|
|
}
|
|
|
|
static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *p, **pp = NULL;
|
|
struct vxlanhdr *vh, *vh2;
|
|
struct ethhdr *eh, *eh2;
|
|
unsigned int hlen, off_vx, off_eth;
|
|
const struct packet_offload *ptype;
|
|
__be16 type;
|
|
int flush = 1;
|
|
|
|
off_vx = skb_gro_offset(skb);
|
|
hlen = off_vx + sizeof(*vh);
|
|
vh = skb_gro_header_fast(skb, off_vx);
|
|
if (skb_gro_header_hard(skb, hlen)) {
|
|
vh = skb_gro_header_slow(skb, hlen, off_vx);
|
|
if (unlikely(!vh))
|
|
goto out;
|
|
}
|
|
skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
|
|
skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
|
|
|
|
off_eth = skb_gro_offset(skb);
|
|
hlen = off_eth + sizeof(*eh);
|
|
eh = skb_gro_header_fast(skb, off_eth);
|
|
if (skb_gro_header_hard(skb, hlen)) {
|
|
eh = skb_gro_header_slow(skb, hlen, off_eth);
|
|
if (unlikely(!eh))
|
|
goto out;
|
|
}
|
|
|
|
flush = 0;
|
|
|
|
for (p = *head; p; p = p->next) {
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
vh2 = (struct vxlanhdr *)(p->data + off_vx);
|
|
eh2 = (struct ethhdr *)(p->data + off_eth);
|
|
if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
type = eh->h_proto;
|
|
|
|
rcu_read_lock();
|
|
ptype = gro_find_receive_by_type(type);
|
|
if (ptype == NULL) {
|
|
flush = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
|
|
skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
|
|
pp = ptype->callbacks.gro_receive(head, skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
|
|
return pp;
|
|
}
|
|
|
|
static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
|
|
{
|
|
struct ethhdr *eh;
|
|
struct packet_offload *ptype;
|
|
__be16 type;
|
|
int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
|
|
int err = -ENOSYS;
|
|
|
|
eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
|
|
type = eh->h_proto;
|
|
|
|
rcu_read_lock();
|
|
ptype = gro_find_complete_by_type(type);
|
|
if (ptype != NULL)
|
|
err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
|
|
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
/* Notify netdevs that UDP port started listening */
|
|
static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
|
|
{
|
|
struct net_device *dev;
|
|
struct sock *sk = vs->sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
sa_family_t sa_family = sk->sk_family;
|
|
__be16 port = inet_sk(sk)->inet_sport;
|
|
int err;
|
|
|
|
if (sa_family == AF_INET) {
|
|
err = udp_add_offload(&vs->udp_offloads);
|
|
if (err)
|
|
pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
if (dev->netdev_ops->ndo_add_vxlan_port)
|
|
dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
|
|
port);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* Notify netdevs that UDP port is no more listening */
|
|
static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
|
|
{
|
|
struct net_device *dev;
|
|
struct sock *sk = vs->sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
sa_family_t sa_family = sk->sk_family;
|
|
__be16 port = inet_sk(sk)->inet_sport;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
if (dev->netdev_ops->ndo_del_vxlan_port)
|
|
dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
|
|
port);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (sa_family == AF_INET)
|
|
udp_del_offload(&vs->udp_offloads);
|
|
}
|
|
|
|
/* Add new entry to forwarding table -- assumes lock held */
|
|
static int vxlan_fdb_create(struct vxlan_dev *vxlan,
|
|
const u8 *mac, union vxlan_addr *ip,
|
|
__u16 state, __u16 flags,
|
|
__be16 port, __u32 vni, __u32 ifindex,
|
|
__u8 ndm_flags)
|
|
{
|
|
struct vxlan_rdst *rd = NULL;
|
|
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_REPLACE)) {
|
|
/* Only change unicasts */
|
|
if (!(is_multicast_ether_addr(f->eth_addr) ||
|
|
is_zero_ether_addr(f->eth_addr))) {
|
|
int rc = vxlan_fdb_replace(f, ip, port, vni,
|
|
ifindex);
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
notify |= rc;
|
|
} else
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if ((flags & NLM_F_APPEND) &&
|
|
(is_multicast_ether_addr(f->eth_addr) ||
|
|
is_zero_ether_addr(f->eth_addr))) {
|
|
int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
|
|
&rd);
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
notify |= rc;
|
|
}
|
|
} else {
|
|
if (!(flags & NLM_F_CREATE))
|
|
return -ENOENT;
|
|
|
|
if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
|
|
return -ENOSPC;
|
|
|
|
/* Disallow replace to add a multicast entry */
|
|
if ((flags & NLM_F_REPLACE) &&
|
|
(is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
|
|
return -EOPNOTSUPP;
|
|
|
|
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
|
|
f = kmalloc(sizeof(*f), GFP_ATOMIC);
|
|
if (!f)
|
|
return -ENOMEM;
|
|
|
|
notify = 1;
|
|
f->state = state;
|
|
f->flags = ndm_flags;
|
|
f->updated = f->used = jiffies;
|
|
INIT_LIST_HEAD(&f->remotes);
|
|
memcpy(f->eth_addr, mac, ETH_ALEN);
|
|
|
|
vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
|
|
|
|
++vxlan->addrcnt;
|
|
hlist_add_head_rcu(&f->hlist,
|
|
vxlan_fdb_head(vxlan, mac));
|
|
}
|
|
|
|
if (notify) {
|
|
if (rd == NULL)
|
|
rd = first_remote_rtnl(f);
|
|
vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vxlan_fdb_free(struct rcu_head *head)
|
|
{
|
|
struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
|
|
struct vxlan_rdst *rd, *nd;
|
|
|
|
list_for_each_entry_safe(rd, nd, &f->remotes, list)
|
|
kfree(rd);
|
|
kfree(f);
|
|
}
|
|
|
|
static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
|
|
{
|
|
netdev_dbg(vxlan->dev,
|
|
"delete %pM\n", f->eth_addr);
|
|
|
|
--vxlan->addrcnt;
|
|
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
|
|
|
|
hlist_del_rcu(&f->hlist);
|
|
call_rcu(&f->rcu, vxlan_fdb_free);
|
|
}
|
|
|
|
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
|
|
union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
|
|
{
|
|
struct net *net = dev_net(vxlan->dev);
|
|
int err;
|
|
|
|
if (tb[NDA_DST]) {
|
|
err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
|
|
if (remote->sa.sa_family == AF_INET) {
|
|
ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
ip->sa.sa_family = AF_INET;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
ip->sin6.sin6_addr = in6addr_any;
|
|
ip->sa.sa_family = AF_INET6;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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;
|
|
} else {
|
|
*ifindex = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Add static entry (via netlink) */
|
|
static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
|
|
struct net_device *dev,
|
|
const unsigned char *addr, u16 flags)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
/* struct net *net = dev_net(vxlan->dev); */
|
|
union vxlan_addr ip;
|
|
__be16 port;
|
|
u32 vni, ifindex;
|
|
int err;
|
|
|
|
if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
|
|
pr_info("RTM_NEWNEIGH with invalid state %#x\n",
|
|
ndm->ndm_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (tb[NDA_DST] == NULL)
|
|
return -EINVAL;
|
|
|
|
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
|
|
if (err)
|
|
return err;
|
|
|
|
if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
|
|
return -EAFNOSUPPORT;
|
|
|
|
spin_lock_bh(&vxlan->hash_lock);
|
|
err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
|
|
port, vni, ifindex, ndm->ndm_flags);
|
|
spin_unlock_bh(&vxlan->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Delete entry (via netlink) */
|
|
static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
|
|
struct net_device *dev,
|
|
const unsigned char *addr)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_fdb *f;
|
|
struct vxlan_rdst *rd = NULL;
|
|
union vxlan_addr ip;
|
|
__be16 port;
|
|
u32 vni, ifindex;
|
|
int err;
|
|
|
|
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
|
|
if (err)
|
|
return err;
|
|
|
|
err = -ENOENT;
|
|
|
|
spin_lock_bh(&vxlan->hash_lock);
|
|
f = vxlan_find_mac(vxlan, addr);
|
|
if (!f)
|
|
goto out;
|
|
|
|
if (!vxlan_addr_any(&ip)) {
|
|
rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
|
|
if (!rd)
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
/* remove a destination if it's not the only one on the list,
|
|
* otherwise destroy the fdb entry
|
|
*/
|
|
if (rd && !list_is_singular(&f->remotes)) {
|
|
list_del_rcu(&rd->list);
|
|
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
|
|
kfree_rcu(rd, rcu);
|
|
goto out;
|
|
}
|
|
|
|
vxlan_fdb_destroy(vxlan, f);
|
|
|
|
out:
|
|
spin_unlock_bh(&vxlan->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Dump forwarding table */
|
|
static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct net_device *dev,
|
|
struct net_device *filter_dev, int idx)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
unsigned int h;
|
|
|
|
for (h = 0; h < FDB_HASH_SIZE; ++h) {
|
|
struct vxlan_fdb *f;
|
|
int err;
|
|
|
|
hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
|
|
struct vxlan_rdst *rd;
|
|
|
|
if (idx < cb->args[0])
|
|
goto skip;
|
|
|
|
list_for_each_entry_rcu(rd, &f->remotes, list) {
|
|
err = vxlan_fdb_info(skb, vxlan, f,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWNEIGH,
|
|
NLM_F_MULTI, rd);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
skip:
|
|
++idx;
|
|
}
|
|
}
|
|
out:
|
|
return idx;
|
|
}
|
|
|
|
/* Watch incoming packets to learn mapping between Ethernet address
|
|
* and Tunnel endpoint.
|
|
* Return true if packet is bogus and should be droppped.
|
|
*/
|
|
static bool vxlan_snoop(struct net_device *dev,
|
|
union vxlan_addr *src_ip, const u8 *src_mac)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_fdb *f;
|
|
|
|
f = vxlan_find_mac(vxlan, src_mac);
|
|
if (likely(f)) {
|
|
struct vxlan_rdst *rdst = first_remote_rcu(f);
|
|
|
|
if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
|
|
return false;
|
|
|
|
/* Don't migrate static entries, drop packets */
|
|
if (f->state & NUD_NOARP)
|
|
return true;
|
|
|
|
if (net_ratelimit())
|
|
netdev_info(dev,
|
|
"%pM migrated from %pIS to %pIS\n",
|
|
src_mac, &rdst->remote_ip, &src_ip);
|
|
|
|
rdst->remote_ip = *src_ip;
|
|
f->updated = jiffies;
|
|
vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
|
|
} else {
|
|
/* learned new entry */
|
|
spin_lock(&vxlan->hash_lock);
|
|
|
|
/* close off race between vxlan_flush and incoming packets */
|
|
if (netif_running(dev))
|
|
vxlan_fdb_create(vxlan, src_mac, src_ip,
|
|
NUD_REACHABLE,
|
|
NLM_F_EXCL|NLM_F_CREATE,
|
|
vxlan->dst_port,
|
|
vxlan->default_dst.remote_vni,
|
|
0, NTF_SELF);
|
|
spin_unlock(&vxlan->hash_lock);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* See if multicast group is already in use by other ID */
|
|
static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
|
|
{
|
|
struct vxlan_dev *vxlan;
|
|
|
|
/* The vxlan_sock is only used by dev, leaving group has
|
|
* no effect on other vxlan devices.
|
|
*/
|
|
if (atomic_read(&dev->vn_sock->refcnt) == 1)
|
|
return false;
|
|
|
|
list_for_each_entry(vxlan, &vn->vxlan_list, next) {
|
|
if (!netif_running(vxlan->dev) || vxlan == dev)
|
|
continue;
|
|
|
|
if (vxlan->vn_sock != dev->vn_sock)
|
|
continue;
|
|
|
|
if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
|
|
&dev->default_dst.remote_ip))
|
|
continue;
|
|
|
|
if (vxlan->default_dst.remote_ifindex !=
|
|
dev->default_dst.remote_ifindex)
|
|
continue;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void vxlan_sock_hold(struct vxlan_sock *vs)
|
|
{
|
|
atomic_inc(&vs->refcnt);
|
|
}
|
|
|
|
void vxlan_sock_release(struct vxlan_sock *vs)
|
|
{
|
|
struct sock *sk = vs->sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
|
|
if (!atomic_dec_and_test(&vs->refcnt))
|
|
return;
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
hlist_del_rcu(&vs->hlist);
|
|
rcu_assign_sk_user_data(vs->sock->sk, NULL);
|
|
vxlan_notify_del_rx_port(vs);
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
queue_work(vxlan_wq, &vs->del_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vxlan_sock_release);
|
|
|
|
/* Callback to update multicast group membership when first VNI on
|
|
* multicast asddress is brought up
|
|
* Done as workqueue because ip_mc_join_group acquires RTNL.
|
|
*/
|
|
static void vxlan_igmp_join(struct work_struct *work)
|
|
{
|
|
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
|
|
struct vxlan_sock *vs = vxlan->vn_sock;
|
|
struct sock *sk = vs->sock->sk;
|
|
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
|
|
int ifindex = vxlan->default_dst.remote_ifindex;
|
|
|
|
lock_sock(sk);
|
|
if (ip->sa.sa_family == AF_INET) {
|
|
struct ip_mreqn mreq = {
|
|
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
|
|
.imr_ifindex = ifindex,
|
|
};
|
|
|
|
ip_mc_join_group(sk, &mreq);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
|
|
&ip->sin6.sin6_addr);
|
|
#endif
|
|
}
|
|
release_sock(sk);
|
|
|
|
vxlan_sock_release(vs);
|
|
dev_put(vxlan->dev);
|
|
}
|
|
|
|
/* Inverse of vxlan_igmp_join when last VNI is brought down */
|
|
static void vxlan_igmp_leave(struct work_struct *work)
|
|
{
|
|
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
|
|
struct vxlan_sock *vs = vxlan->vn_sock;
|
|
struct sock *sk = vs->sock->sk;
|
|
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
|
|
int ifindex = vxlan->default_dst.remote_ifindex;
|
|
|
|
lock_sock(sk);
|
|
if (ip->sa.sa_family == AF_INET) {
|
|
struct ip_mreqn mreq = {
|
|
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
|
|
.imr_ifindex = ifindex,
|
|
};
|
|
|
|
ip_mc_leave_group(sk, &mreq);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
|
|
&ip->sin6.sin6_addr);
|
|
#endif
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
vxlan_sock_release(vs);
|
|
dev_put(vxlan->dev);
|
|
}
|
|
|
|
/* Callback from net/ipv4/udp.c to receive packets */
|
|
static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct vxlan_sock *vs;
|
|
struct vxlanhdr *vxh;
|
|
|
|
/* Need Vxlan and inner Ethernet header to be present */
|
|
if (!pskb_may_pull(skb, VXLAN_HLEN))
|
|
goto error;
|
|
|
|
/* Return packets with reserved bits set */
|
|
vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
|
|
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;
|
|
}
|
|
|
|
if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
|
|
goto drop;
|
|
|
|
vs = rcu_dereference_sk_user_data(sk);
|
|
if (!vs)
|
|
goto drop;
|
|
|
|
skb_pop_rcv_encapsulation(skb);
|
|
|
|
vs->rcv(vs, skb, vxh->vx_vni);
|
|
return 0;
|
|
|
|
drop:
|
|
/* Consume bad packet */
|
|
kfree_skb(skb);
|
|
return 0;
|
|
|
|
error:
|
|
/* Return non vxlan pkt */
|
|
return 1;
|
|
}
|
|
|
|
static void vxlan_rcv(struct vxlan_sock *vs,
|
|
struct sk_buff *skb, __be32 vx_vni)
|
|
{
|
|
struct iphdr *oip = NULL;
|
|
struct ipv6hdr *oip6 = NULL;
|
|
struct vxlan_dev *vxlan;
|
|
struct pcpu_sw_netstats *stats;
|
|
union vxlan_addr saddr;
|
|
__u32 vni;
|
|
int err = 0;
|
|
union vxlan_addr *remote_ip;
|
|
|
|
vni = ntohl(vx_vni) >> 8;
|
|
/* Is this VNI defined? */
|
|
vxlan = vxlan_vs_find_vni(vs, vni);
|
|
if (!vxlan)
|
|
goto drop;
|
|
|
|
remote_ip = &vxlan->default_dst.remote_ip;
|
|
skb_reset_mac_header(skb);
|
|
skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
|
|
skb->protocol = eth_type_trans(skb, vxlan->dev);
|
|
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
|
|
|
|
/* Ignore packet loops (and multicast echo) */
|
|
if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
|
|
goto drop;
|
|
|
|
/* Re-examine inner Ethernet packet */
|
|
if (remote_ip->sa.sa_family == AF_INET) {
|
|
oip = ip_hdr(skb);
|
|
saddr.sin.sin_addr.s_addr = oip->saddr;
|
|
saddr.sa.sa_family = AF_INET;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
oip6 = ipv6_hdr(skb);
|
|
saddr.sin6.sin6_addr = oip6->saddr;
|
|
saddr.sa.sa_family = AF_INET6;
|
|
#endif
|
|
}
|
|
|
|
if ((vxlan->flags & VXLAN_F_LEARN) &&
|
|
vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
|
|
goto drop;
|
|
|
|
skb_reset_network_header(skb);
|
|
|
|
if (oip6)
|
|
err = IP6_ECN_decapsulate(oip6, skb);
|
|
if (oip)
|
|
err = IP_ECN_decapsulate(oip, skb);
|
|
|
|
if (unlikely(err)) {
|
|
if (log_ecn_error) {
|
|
if (oip6)
|
|
net_info_ratelimited("non-ECT from %pI6\n",
|
|
&oip6->saddr);
|
|
if (oip)
|
|
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;
|
|
drop:
|
|
/* Consume bad packet */
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
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 && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
|
|
/* 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) {
|
|
union vxlan_addr ipa = {
|
|
.sin.sin_addr.s_addr = tip,
|
|
.sa.sa_family = AF_INET,
|
|
};
|
|
|
|
vxlan_ip_miss(dev, &ipa);
|
|
}
|
|
out:
|
|
consume_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
static struct sk_buff *vxlan_na_create(struct sk_buff *request,
|
|
struct neighbour *n, bool isrouter)
|
|
{
|
|
struct net_device *dev = request->dev;
|
|
struct sk_buff *reply;
|
|
struct nd_msg *ns, *na;
|
|
struct ipv6hdr *pip6;
|
|
u8 *daddr;
|
|
int na_olen = 8; /* opt hdr + ETH_ALEN for target */
|
|
int ns_olen;
|
|
int i, len;
|
|
|
|
if (dev == NULL)
|
|
return NULL;
|
|
|
|
len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
|
|
sizeof(*na) + na_olen + dev->needed_tailroom;
|
|
reply = alloc_skb(len, GFP_ATOMIC);
|
|
if (reply == NULL)
|
|
return NULL;
|
|
|
|
reply->protocol = htons(ETH_P_IPV6);
|
|
reply->dev = dev;
|
|
skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
|
|
skb_push(reply, sizeof(struct ethhdr));
|
|
skb_set_mac_header(reply, 0);
|
|
|
|
ns = (struct nd_msg *)skb_transport_header(request);
|
|
|
|
daddr = eth_hdr(request)->h_source;
|
|
ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
|
|
for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
|
|
if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
|
|
daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Ethernet header */
|
|
ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
|
|
ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
|
|
eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
|
|
reply->protocol = htons(ETH_P_IPV6);
|
|
|
|
skb_pull(reply, sizeof(struct ethhdr));
|
|
skb_set_network_header(reply, 0);
|
|
skb_put(reply, sizeof(struct ipv6hdr));
|
|
|
|
/* IPv6 header */
|
|
|
|
pip6 = ipv6_hdr(reply);
|
|
memset(pip6, 0, sizeof(struct ipv6hdr));
|
|
pip6->version = 6;
|
|
pip6->priority = ipv6_hdr(request)->priority;
|
|
pip6->nexthdr = IPPROTO_ICMPV6;
|
|
pip6->hop_limit = 255;
|
|
pip6->daddr = ipv6_hdr(request)->saddr;
|
|
pip6->saddr = *(struct in6_addr *)n->primary_key;
|
|
|
|
skb_pull(reply, sizeof(struct ipv6hdr));
|
|
skb_set_transport_header(reply, 0);
|
|
|
|
na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
|
|
|
|
/* Neighbor Advertisement */
|
|
memset(na, 0, sizeof(*na)+na_olen);
|
|
na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
|
|
na->icmph.icmp6_router = isrouter;
|
|
na->icmph.icmp6_override = 1;
|
|
na->icmph.icmp6_solicited = 1;
|
|
na->target = ns->target;
|
|
ether_addr_copy(&na->opt[2], n->ha);
|
|
na->opt[0] = ND_OPT_TARGET_LL_ADDR;
|
|
na->opt[1] = na_olen >> 3;
|
|
|
|
na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
|
|
&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
|
|
csum_partial(na, sizeof(*na)+na_olen, 0));
|
|
|
|
pip6->payload_len = htons(sizeof(*na)+na_olen);
|
|
|
|
skb_push(reply, sizeof(struct ipv6hdr));
|
|
|
|
reply->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
return reply;
|
|
}
|
|
|
|
static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct nd_msg *msg;
|
|
const struct ipv6hdr *iphdr;
|
|
const struct in6_addr *saddr, *daddr;
|
|
struct neighbour *n;
|
|
struct inet6_dev *in6_dev;
|
|
|
|
in6_dev = __in6_dev_get(dev);
|
|
if (!in6_dev)
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, skb->len))
|
|
goto out;
|
|
|
|
iphdr = ipv6_hdr(skb);
|
|
saddr = &iphdr->saddr;
|
|
daddr = &iphdr->daddr;
|
|
|
|
msg = (struct nd_msg *)skb_transport_header(skb);
|
|
if (msg->icmph.icmp6_code != 0 ||
|
|
msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
|
|
goto out;
|
|
|
|
if (ipv6_addr_loopback(daddr) ||
|
|
ipv6_addr_is_multicast(&msg->target))
|
|
goto out;
|
|
|
|
n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, 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 && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
|
|
/* bridge-local neighbor */
|
|
neigh_release(n);
|
|
goto out;
|
|
}
|
|
|
|
reply = vxlan_na_create(skb, n,
|
|
!!(f ? f->flags & NTF_ROUTER : 0));
|
|
|
|
neigh_release(n);
|
|
|
|
if (reply == NULL)
|
|
goto out;
|
|
|
|
if (netif_rx_ni(reply) == NET_RX_DROP)
|
|
dev->stats.rx_dropped++;
|
|
|
|
} else if (vxlan->flags & VXLAN_F_L3MISS) {
|
|
union vxlan_addr ipa = {
|
|
.sin6.sin6_addr = msg->target,
|
|
.sa.sa_family = AF_INET6,
|
|
};
|
|
|
|
vxlan_ip_miss(dev, &ipa);
|
|
}
|
|
|
|
out:
|
|
consume_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
#endif
|
|
|
|
static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct neighbour *n;
|
|
|
|
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:
|
|
{
|
|
struct iphdr *pip;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
return false;
|
|
pip = ip_hdr(skb);
|
|
n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
|
|
if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
|
|
union vxlan_addr ipa = {
|
|
.sin.sin_addr.s_addr = pip->daddr,
|
|
.sa.sa_family = AF_INET,
|
|
};
|
|
|
|
vxlan_ip_miss(dev, &ipa);
|
|
return false;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case ETH_P_IPV6:
|
|
{
|
|
struct ipv6hdr *pip6;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
return false;
|
|
pip6 = ipv6_hdr(skb);
|
|
n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
|
|
if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
|
|
union vxlan_addr ipa = {
|
|
.sin6.sin6_addr = pip6->daddr,
|
|
.sa.sa_family = AF_INET6,
|
|
};
|
|
|
|
vxlan_ip_miss(dev, &ipa);
|
|
return false;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (n) {
|
|
bool diff;
|
|
|
|
diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
|
|
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;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline struct sk_buff *vxlan_handle_offloads(struct sk_buff *skb,
|
|
bool udp_csum)
|
|
{
|
|
int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
|
|
return iptunnel_handle_offloads(skb, udp_csum, type);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int vxlan6_xmit_skb(struct vxlan_sock *vs,
|
|
struct dst_entry *dst, struct sk_buff *skb,
|
|
struct net_device *dev, struct in6_addr *saddr,
|
|
struct in6_addr *daddr, __u8 prio, __u8 ttl,
|
|
__be16 src_port, __be16 dst_port, __be32 vni,
|
|
bool xnet)
|
|
{
|
|
struct ipv6hdr *ip6h;
|
|
struct vxlanhdr *vxh;
|
|
struct udphdr *uh;
|
|
int min_headroom;
|
|
int err;
|
|
|
|
skb = vxlan_handle_offloads(skb, !udp_get_no_check6_tx(vs->sock->sk));
|
|
if (IS_ERR(skb))
|
|
return -EINVAL;
|
|
|
|
skb_scrub_packet(skb, xnet);
|
|
|
|
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
|
|
+ VXLAN_HLEN + sizeof(struct ipv6hdr)
|
|
+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
|
|
|
|
/* Need space for new headers (invalidates iph ptr) */
|
|
err = skb_cow_head(skb, min_headroom);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if (vlan_tx_tag_present(skb)) {
|
|
if (WARN_ON(!__vlan_put_tag(skb,
|
|
skb->vlan_proto,
|
|
vlan_tx_tag_get(skb))))
|
|
return -ENOMEM;
|
|
|
|
skb->vlan_tci = 0;
|
|
}
|
|
|
|
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
|
|
vxh->vx_flags = htonl(VXLAN_FLAGS);
|
|
vxh->vx_vni = vni;
|
|
|
|
__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);
|
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
|
|
IPSKB_REROUTED);
|
|
skb_dst_set(skb, dst);
|
|
|
|
udp6_set_csum(udp_get_no_check6_tx(vs->sock->sk), skb,
|
|
saddr, daddr, skb->len);
|
|
|
|
__skb_push(skb, sizeof(*ip6h));
|
|
skb_reset_network_header(skb);
|
|
ip6h = ipv6_hdr(skb);
|
|
ip6h->version = 6;
|
|
ip6h->priority = prio;
|
|
ip6h->flow_lbl[0] = 0;
|
|
ip6h->flow_lbl[1] = 0;
|
|
ip6h->flow_lbl[2] = 0;
|
|
ip6h->payload_len = htons(skb->len);
|
|
ip6h->nexthdr = IPPROTO_UDP;
|
|
ip6h->hop_limit = ttl;
|
|
ip6h->daddr = *daddr;
|
|
ip6h->saddr = *saddr;
|
|
|
|
ip6tunnel_xmit(skb, dev);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int vxlan_xmit_skb(struct vxlan_sock *vs,
|
|
struct rtable *rt, struct sk_buff *skb,
|
|
__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
|
|
__be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
|
|
{
|
|
struct vxlanhdr *vxh;
|
|
struct udphdr *uh;
|
|
int min_headroom;
|
|
int err;
|
|
|
|
skb = vxlan_handle_offloads(skb, !vs->sock->sk->sk_no_check_tx);
|
|
if (IS_ERR(skb))
|
|
return -EINVAL;
|
|
|
|
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
|
|
+ VXLAN_HLEN + sizeof(struct iphdr)
|
|
+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
|
|
|
|
/* Need space for new headers (invalidates iph ptr) */
|
|
err = skb_cow_head(skb, min_headroom);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if (vlan_tx_tag_present(skb)) {
|
|
if (WARN_ON(!__vlan_put_tag(skb,
|
|
skb->vlan_proto,
|
|
vlan_tx_tag_get(skb))))
|
|
return -ENOMEM;
|
|
|
|
skb->vlan_tci = 0;
|
|
}
|
|
|
|
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
|
|
vxh->vx_flags = htonl(VXLAN_FLAGS);
|
|
vxh->vx_vni = vni;
|
|
|
|
__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);
|
|
|
|
udp_set_csum(vs->sock->sk->sk_no_check_tx, skb,
|
|
src, dst, skb->len);
|
|
|
|
return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
|
|
tos, ttl, df, xnet);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
|
|
|
|
/* 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_sw_netstats *tx_stats, *rx_stats;
|
|
union vxlan_addr loopback;
|
|
union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
|
|
|
|
tx_stats = this_cpu_ptr(src_vxlan->dev->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 (remote_ip->sa.sa_family == AF_INET) {
|
|
loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
loopback.sa.sa_family = AF_INET;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
loopback.sin6.sin6_addr = in6addr_loopback;
|
|
loopback.sa.sa_family = AF_INET6;
|
|
#endif
|
|
}
|
|
|
|
if (dst_vxlan->flags & VXLAN_F_LEARN)
|
|
vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
|
|
|
|
u64_stats_update_begin(&tx_stats->syncp);
|
|
tx_stats->tx_packets++;
|
|
tx_stats->tx_bytes += skb->len;
|
|
u64_stats_update_end(&tx_stats->syncp);
|
|
|
|
if (netif_rx(skb) == NET_RX_SUCCESS) {
|
|
u64_stats_update_begin(&rx_stats->syncp);
|
|
rx_stats->rx_packets++;
|
|
rx_stats->rx_bytes += skb->len;
|
|
u64_stats_update_end(&rx_stats->syncp);
|
|
} else {
|
|
skb->dev->stats.rx_dropped++;
|
|
}
|
|
}
|
|
|
|
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
|
|
struct vxlan_rdst *rdst, bool did_rsc)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct rtable *rt = NULL;
|
|
const struct iphdr *old_iph;
|
|
struct flowi4 fl4;
|
|
union vxlan_addr *dst;
|
|
__be16 src_port = 0, dst_port;
|
|
u32 vni;
|
|
__be16 df = 0;
|
|
__u8 tos, ttl;
|
|
int err;
|
|
|
|
dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
|
|
vni = rdst->remote_vni;
|
|
dst = &rdst->remote_ip;
|
|
|
|
if (vxlan_addr_any(dst)) {
|
|
if (did_rsc) {
|
|
/* short-circuited back to local bridge */
|
|
vxlan_encap_bypass(skb, vxlan, vxlan);
|
|
return;
|
|
}
|
|
goto drop;
|
|
}
|
|
|
|
old_iph = ip_hdr(skb);
|
|
|
|
ttl = vxlan->ttl;
|
|
if (!ttl && vxlan_addr_multicast(dst))
|
|
ttl = 1;
|
|
|
|
tos = vxlan->tos;
|
|
if (tos == 1)
|
|
tos = ip_tunnel_get_dsfield(old_iph, skb);
|
|
|
|
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
|
|
vxlan->port_max, true);
|
|
|
|
if (dst->sa.sa_family == AF_INET) {
|
|
memset(&fl4, 0, sizeof(fl4));
|
|
fl4.flowi4_oif = rdst->remote_ifindex;
|
|
fl4.flowi4_tos = RT_TOS(tos);
|
|
fl4.daddr = dst->sin.sin_addr.s_addr;
|
|
fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
|
|
|
|
rt = ip_route_output_key(vxlan->net, &fl4);
|
|
if (IS_ERR(rt)) {
|
|
netdev_dbg(dev, "no route to %pI4\n",
|
|
&dst->sin.sin_addr.s_addr);
|
|
dev->stats.tx_carrier_errors++;
|
|
goto tx_error;
|
|
}
|
|
|
|
if (rt->dst.dev == dev) {
|
|
netdev_dbg(dev, "circular route to %pI4\n",
|
|
&dst->sin.sin_addr.s_addr);
|
|
dev->stats.collisions++;
|
|
goto rt_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(vxlan->net, vni, dst_port);
|
|
if (!dst_vxlan)
|
|
goto tx_error;
|
|
vxlan_encap_bypass(skb, vxlan, dst_vxlan);
|
|
return;
|
|
}
|
|
|
|
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
|
|
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
|
|
|
|
err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
|
|
fl4.saddr, dst->sin.sin_addr.s_addr,
|
|
tos, ttl, df, src_port, dst_port,
|
|
htonl(vni << 8),
|
|
!net_eq(vxlan->net, dev_net(vxlan->dev)));
|
|
|
|
if (err < 0)
|
|
goto rt_tx_error;
|
|
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
struct sock *sk = vxlan->vn_sock->sock->sk;
|
|
struct dst_entry *ndst;
|
|
struct flowi6 fl6;
|
|
u32 flags;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_oif = rdst->remote_ifindex;
|
|
fl6.daddr = dst->sin6.sin6_addr;
|
|
fl6.saddr = vxlan->saddr.sin6.sin6_addr;
|
|
fl6.flowi6_proto = IPPROTO_UDP;
|
|
|
|
if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
|
|
netdev_dbg(dev, "no route to %pI6\n",
|
|
&dst->sin6.sin6_addr);
|
|
dev->stats.tx_carrier_errors++;
|
|
goto tx_error;
|
|
}
|
|
|
|
if (ndst->dev == dev) {
|
|
netdev_dbg(dev, "circular route to %pI6\n",
|
|
&dst->sin6.sin6_addr);
|
|
dst_release(ndst);
|
|
dev->stats.collisions++;
|
|
goto tx_error;
|
|
}
|
|
|
|
/* Bypass encapsulation if the destination is local */
|
|
flags = ((struct rt6_info *)ndst)->rt6i_flags;
|
|
if (flags & RTF_LOCAL &&
|
|
!(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
|
|
struct vxlan_dev *dst_vxlan;
|
|
|
|
dst_release(ndst);
|
|
dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
|
|
if (!dst_vxlan)
|
|
goto tx_error;
|
|
vxlan_encap_bypass(skb, vxlan, dst_vxlan);
|
|
return;
|
|
}
|
|
|
|
ttl = ttl ? : ip6_dst_hoplimit(ndst);
|
|
|
|
err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
|
|
dev, &fl6.saddr, &fl6.daddr, 0, ttl,
|
|
src_port, dst_port, htonl(vni << 8),
|
|
!net_eq(vxlan->net, dev_net(vxlan->dev)));
|
|
#endif
|
|
}
|
|
|
|
return;
|
|
|
|
drop:
|
|
dev->stats.tx_dropped++;
|
|
goto tx_free;
|
|
|
|
rt_tx_error:
|
|
ip_rt_put(rt);
|
|
tx_error:
|
|
dev->stats.tx_errors++;
|
|
tx_free:
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
/* Transmit local packets over Vxlan
|
|
*
|
|
* Outer IP header inherits ECN and DF from inner header.
|
|
* Outer UDP destination is the VXLAN assigned port.
|
|
* source port is based on hash of flow
|
|
*/
|
|
static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct ethhdr *eth;
|
|
bool did_rsc = false;
|
|
struct vxlan_rdst *rdst, *fdst = NULL;
|
|
struct vxlan_fdb *f;
|
|
|
|
skb_reset_mac_header(skb);
|
|
eth = eth_hdr(skb);
|
|
|
|
if ((vxlan->flags & VXLAN_F_PROXY)) {
|
|
if (ntohs(eth->h_proto) == ETH_P_ARP)
|
|
return arp_reduce(dev, skb);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
|
|
skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
|
|
ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
|
|
struct nd_msg *msg;
|
|
|
|
msg = (struct nd_msg *)skb_transport_header(skb);
|
|
if (msg->icmph.icmp6_code == 0 &&
|
|
msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
|
|
return neigh_reduce(dev, skb);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
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 ||
|
|
ntohs(eth->h_proto) == ETH_P_IPV6)) {
|
|
did_rsc = route_shortcircuit(dev, skb);
|
|
if (did_rsc)
|
|
f = vxlan_find_mac(vxlan, eth->h_dest);
|
|
}
|
|
|
|
if (f == NULL) {
|
|
f = vxlan_find_mac(vxlan, all_zeros_mac);
|
|
if (f == NULL) {
|
|
if ((vxlan->flags & VXLAN_F_L2MISS) &&
|
|
!is_multicast_ether_addr(eth->h_dest))
|
|
vxlan_fdb_miss(vxlan, eth->h_dest);
|
|
|
|
dev->stats.tx_dropped++;
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry_rcu(rdst, &f->remotes, list) {
|
|
struct sk_buff *skb1;
|
|
|
|
if (!fdst) {
|
|
fdst = rdst;
|
|
continue;
|
|
}
|
|
skb1 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb1)
|
|
vxlan_xmit_one(skb1, dev, rdst, did_rsc);
|
|
}
|
|
|
|
if (fdst)
|
|
vxlan_xmit_one(skb, dev, fdst, did_rsc);
|
|
else
|
|
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);
|
|
}
|
|
|
|
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
|
|
{
|
|
__u32 vni = vxlan->default_dst.remote_vni;
|
|
|
|
vxlan->vn_sock = vs;
|
|
hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
|
|
}
|
|
|
|
/* Setup stats when device is created */
|
|
static int vxlan_init(struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
|
struct vxlan_sock *vs;
|
|
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
|
|
if (vs) {
|
|
/* If we have a socket with same port already, reuse it */
|
|
atomic_inc(&vs->refcnt);
|
|
vxlan_vs_add_dev(vs, vxlan);
|
|
} else {
|
|
/* otherwise make new socket outside of RTNL */
|
|
dev_hold(dev);
|
|
queue_work(vxlan_wq, &vxlan->sock_work);
|
|
}
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
|
|
{
|
|
struct vxlan_fdb *f;
|
|
|
|
spin_lock_bh(&vxlan->hash_lock);
|
|
f = __vxlan_find_mac(vxlan, all_zeros_mac);
|
|
if (f)
|
|
vxlan_fdb_destroy(vxlan, f);
|
|
spin_unlock_bh(&vxlan->hash_lock);
|
|
}
|
|
|
|
static void vxlan_uninit(struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_sock *vs = vxlan->vn_sock;
|
|
|
|
vxlan_fdb_delete_default(vxlan);
|
|
|
|
if (vs)
|
|
vxlan_sock_release(vs);
|
|
free_percpu(dev->tstats);
|
|
}
|
|
|
|
/* Start ageing timer and join group when device is brought up */
|
|
static int vxlan_open(struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_sock *vs = vxlan->vn_sock;
|
|
|
|
/* socket hasn't been created */
|
|
if (!vs)
|
|
return -ENOTCONN;
|
|
|
|
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
|
|
vxlan_sock_hold(vs);
|
|
dev_hold(dev);
|
|
queue_work(vxlan_wq, &vxlan->igmp_join);
|
|
}
|
|
|
|
if (vxlan->age_interval)
|
|
mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Purge the forwarding table */
|
|
static void vxlan_flush(struct vxlan_dev *vxlan)
|
|
{
|
|
unsigned int h;
|
|
|
|
spin_lock_bh(&vxlan->hash_lock);
|
|
for (h = 0; h < FDB_HASH_SIZE; ++h) {
|
|
struct hlist_node *p, *n;
|
|
hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
|
|
struct vxlan_fdb *f
|
|
= container_of(p, struct vxlan_fdb, hlist);
|
|
/* the all_zeros_mac entry is deleted at vxlan_uninit */
|
|
if (!is_zero_ether_addr(f->eth_addr))
|
|
vxlan_fdb_destroy(vxlan, f);
|
|
}
|
|
}
|
|
spin_unlock_bh(&vxlan->hash_lock);
|
|
}
|
|
|
|
/* Cleanup timer and forwarding table on shutdown */
|
|
static int vxlan_stop(struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
|
struct vxlan_sock *vs = vxlan->vn_sock;
|
|
|
|
if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
|
|
!vxlan_group_used(vn, vxlan)) {
|
|
vxlan_sock_hold(vs);
|
|
dev_hold(dev);
|
|
queue_work(vxlan_wq, &vxlan->igmp_leave);
|
|
}
|
|
|
|
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 int vxlan_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_rdst *dst = &vxlan->default_dst;
|
|
struct net_device *lowerdev;
|
|
int max_mtu;
|
|
|
|
lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
|
|
if (lowerdev == NULL)
|
|
return eth_change_mtu(dev, new_mtu);
|
|
|
|
if (dst->remote_ip.sa.sa_family == AF_INET6)
|
|
max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
|
|
else
|
|
max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
|
|
|
|
if (new_mtu < 68 || new_mtu > max_mtu)
|
|
return -EINVAL;
|
|
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops vxlan_netdev_ops = {
|
|
.ndo_init = vxlan_init,
|
|
.ndo_uninit = vxlan_uninit,
|
|
.ndo_open = vxlan_open,
|
|
.ndo_stop = vxlan_stop,
|
|
.ndo_start_xmit = vxlan_xmit,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
.ndo_set_rx_mode = vxlan_set_multicast_list,
|
|
.ndo_change_mtu = vxlan_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",
|
|
};
|
|
|
|
/* Calls the ndo_add_vxlan_port of the caller in order to
|
|
* supply the listening VXLAN udp ports. Callers are expected
|
|
* to implement the ndo_add_vxlan_port.
|
|
*/
|
|
void vxlan_get_rx_port(struct net_device *dev)
|
|
{
|
|
struct vxlan_sock *vs;
|
|
struct net *net = dev_net(dev);
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
sa_family_t sa_family;
|
|
__be16 port;
|
|
unsigned int i;
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
for (i = 0; i < PORT_HASH_SIZE; ++i) {
|
|
hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
|
|
port = inet_sk(vs->sock->sk)->inet_sport;
|
|
sa_family = vs->sock->sk->sk_family;
|
|
dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
|
|
port);
|
|
}
|
|
}
|
|
spin_unlock(&vn->sock_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
|
|
|
|
/* Initialize the device structure. */
|
|
static void vxlan_setup(struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
unsigned int h;
|
|
|
|
eth_hw_addr_random(dev);
|
|
ether_setup(dev);
|
|
if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
|
|
dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
|
|
else
|
|
dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
|
|
|
|
dev->netdev_ops = &vxlan_netdev_ops;
|
|
dev->destructor = free_netdev;
|
|
SET_NETDEV_DEVTYPE(dev, &vxlan_type);
|
|
|
|
dev->tx_queue_len = 0;
|
|
dev->features |= NETIF_F_LLTX;
|
|
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
|
|
dev->features |= NETIF_F_RXCSUM;
|
|
dev->features |= NETIF_F_GSO_SOFTWARE;
|
|
|
|
dev->vlan_features = dev->features;
|
|
dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
|
|
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
|
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
|
|
dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
|
|
|
|
INIT_LIST_HEAD(&vxlan->next);
|
|
spin_lock_init(&vxlan->hash_lock);
|
|
INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
|
|
INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
|
|
INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
|
|
|
|
init_timer_deferrable(&vxlan->age_timer);
|
|
vxlan->age_timer.function = vxlan_cleanup;
|
|
vxlan->age_timer.data = (unsigned long) vxlan;
|
|
|
|
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_GROUP6] = { .len = sizeof(struct in6_addr) },
|
|
[IFLA_VXLAN_LINK] = { .type = NLA_U32 },
|
|
[IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
|
|
[IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
|
|
[IFLA_VXLAN_TOS] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_TTL] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
|
|
[IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
|
|
[IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
|
|
[IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_RSC] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
|
|
[IFLA_VXLAN_PORT] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
|
|
pr_debug("invalid link address (not ethernet)\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
|
|
pr_debug("invalid all zero ethernet address\n");
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
}
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
if (data[IFLA_VXLAN_ID]) {
|
|
__u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
|
|
if (id >= VXLAN_VID_MASK)
|
|
return -ERANGE;
|
|
}
|
|
|
|
if (data[IFLA_VXLAN_PORT_RANGE]) {
|
|
const struct ifla_vxlan_port_range *p
|
|
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
|
|
|
|
if (ntohs(p->high) < ntohs(p->low)) {
|
|
pr_debug("port range %u .. %u not valid\n",
|
|
ntohs(p->low), ntohs(p->high));
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vxlan_get_drvinfo(struct net_device *netdev,
|
|
struct ethtool_drvinfo *drvinfo)
|
|
{
|
|
strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
|
|
strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
|
|
}
|
|
|
|
static const struct ethtool_ops vxlan_ethtool_ops = {
|
|
.get_drvinfo = vxlan_get_drvinfo,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
static void vxlan_del_work(struct work_struct *work)
|
|
{
|
|
struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
|
|
|
|
sk_release_kernel(vs->sock->sk);
|
|
kfree_rcu(vs, rcu);
|
|
}
|
|
|
|
static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
|
|
__be16 port, u32 flags)
|
|
{
|
|
struct socket *sock;
|
|
struct udp_port_cfg udp_conf;
|
|
int err;
|
|
|
|
memset(&udp_conf, 0, sizeof(udp_conf));
|
|
|
|
if (ipv6) {
|
|
udp_conf.family = AF_INET6;
|
|
udp_conf.use_udp6_tx_checksums =
|
|
!!(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
|
|
udp_conf.use_udp6_rx_checksums =
|
|
!!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
|
|
} else {
|
|
udp_conf.family = AF_INET;
|
|
udp_conf.local_ip.s_addr = INADDR_ANY;
|
|
udp_conf.use_udp_checksums =
|
|
!!(flags & VXLAN_F_UDP_CSUM);
|
|
}
|
|
|
|
udp_conf.local_udp_port = port;
|
|
|
|
/* Open UDP socket */
|
|
err = udp_sock_create(net, &udp_conf, &sock);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
|
|
/* Disable multicast loopback */
|
|
inet_sk(sock->sk)->mc_loop = 0;
|
|
|
|
return sock;
|
|
}
|
|
|
|
/* Create new listen socket if needed */
|
|
static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
|
|
vxlan_rcv_t *rcv, void *data,
|
|
u32 flags)
|
|
{
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
struct vxlan_sock *vs;
|
|
struct socket *sock;
|
|
struct sock *sk;
|
|
unsigned int h;
|
|
bool ipv6 = !!(flags & VXLAN_F_IPV6);
|
|
|
|
vs = kzalloc(sizeof(*vs), GFP_KERNEL);
|
|
if (!vs)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (h = 0; h < VNI_HASH_SIZE; ++h)
|
|
INIT_HLIST_HEAD(&vs->vni_list[h]);
|
|
|
|
INIT_WORK(&vs->del_work, vxlan_del_work);
|
|
|
|
sock = vxlan_create_sock(net, ipv6, port, flags);
|
|
if (IS_ERR(sock)) {
|
|
kfree(vs);
|
|
return ERR_CAST(sock);
|
|
}
|
|
|
|
vs->sock = sock;
|
|
sk = sock->sk;
|
|
atomic_set(&vs->refcnt, 1);
|
|
vs->rcv = rcv;
|
|
vs->data = data;
|
|
rcu_assign_sk_user_data(vs->sock->sk, vs);
|
|
|
|
/* Initialize the vxlan udp offloads structure */
|
|
vs->udp_offloads.port = port;
|
|
vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
|
|
vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
|
|
vxlan_notify_add_rx_port(vs);
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
/* Mark socket as an encapsulation socket. */
|
|
udp_sk(sk)->encap_type = 1;
|
|
udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (ipv6)
|
|
ipv6_stub->udpv6_encap_enable();
|
|
else
|
|
#endif
|
|
udp_encap_enable();
|
|
|
|
return vs;
|
|
}
|
|
|
|
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
|
|
vxlan_rcv_t *rcv, void *data,
|
|
bool no_share, u32 flags)
|
|
{
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
struct vxlan_sock *vs;
|
|
|
|
vs = vxlan_socket_create(net, port, rcv, data, flags);
|
|
if (!IS_ERR(vs))
|
|
return vs;
|
|
|
|
if (no_share) /* Return error if sharing is not allowed. */
|
|
return vs;
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
vs = vxlan_find_sock(net, port);
|
|
if (vs) {
|
|
if (vs->rcv == rcv)
|
|
atomic_inc(&vs->refcnt);
|
|
else
|
|
vs = ERR_PTR(-EBUSY);
|
|
}
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
if (!vs)
|
|
vs = ERR_PTR(-EINVAL);
|
|
|
|
return vs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vxlan_sock_add);
|
|
|
|
/* Scheduled at device creation to bind to a socket */
|
|
static void vxlan_sock_work(struct work_struct *work)
|
|
{
|
|
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
|
|
struct net *net = vxlan->net;
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
__be16 port = vxlan->dst_port;
|
|
struct vxlan_sock *nvs;
|
|
|
|
nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
|
|
spin_lock(&vn->sock_lock);
|
|
if (!IS_ERR(nvs))
|
|
vxlan_vs_add_dev(nvs, vxlan);
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
dev_put(vxlan->dev);
|
|
}
|
|
|
|
static int vxlan_newlink(struct net *net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_rdst *dst = &vxlan->default_dst;
|
|
__u32 vni;
|
|
int err;
|
|
bool use_ipv6 = false;
|
|
|
|
if (!data[IFLA_VXLAN_ID])
|
|
return -EINVAL;
|
|
|
|
vxlan->net = dev_net(dev);
|
|
|
|
vni = nla_get_u32(data[IFLA_VXLAN_ID]);
|
|
dst->remote_vni = vni;
|
|
|
|
/* Unless IPv6 is explicitly requested, assume IPv4 */
|
|
dst->remote_ip.sa.sa_family = AF_INET;
|
|
if (data[IFLA_VXLAN_GROUP]) {
|
|
dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
|
|
} else if (data[IFLA_VXLAN_GROUP6]) {
|
|
if (!IS_ENABLED(CONFIG_IPV6))
|
|
return -EPFNOSUPPORT;
|
|
|
|
nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
|
|
sizeof(struct in6_addr));
|
|
dst->remote_ip.sa.sa_family = AF_INET6;
|
|
use_ipv6 = true;
|
|
}
|
|
|
|
if (data[IFLA_VXLAN_LOCAL]) {
|
|
vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
|
|
vxlan->saddr.sa.sa_family = AF_INET;
|
|
} else if (data[IFLA_VXLAN_LOCAL6]) {
|
|
if (!IS_ENABLED(CONFIG_IPV6))
|
|
return -EPFNOSUPPORT;
|
|
|
|
/* TODO: respect scope id */
|
|
nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
|
|
sizeof(struct in6_addr));
|
|
vxlan->saddr.sa.sa_family = AF_INET6;
|
|
use_ipv6 = true;
|
|
}
|
|
|
|
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 IS_ENABLED(CONFIG_IPV6)
|
|
if (use_ipv6) {
|
|
struct inet6_dev *idev = __in6_dev_get(lowerdev);
|
|
if (idev && idev->cnf.disable_ipv6) {
|
|
pr_info("IPv6 is disabled via sysctl\n");
|
|
return -EPERM;
|
|
}
|
|
vxlan->flags |= VXLAN_F_IPV6;
|
|
}
|
|
#endif
|
|
|
|
if (!tb[IFLA_MTU])
|
|
dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
|
|
|
|
dev->needed_headroom = lowerdev->hard_header_len +
|
|
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
|
|
} else if (use_ipv6)
|
|
vxlan->flags |= VXLAN_F_IPV6;
|
|
|
|
if (data[IFLA_VXLAN_TOS])
|
|
vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
|
|
|
|
if (data[IFLA_VXLAN_TTL])
|
|
vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
|
|
|
|
if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
|
|
vxlan->flags |= VXLAN_F_LEARN;
|
|
|
|
if (data[IFLA_VXLAN_AGEING])
|
|
vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
|
|
else
|
|
vxlan->age_interval = FDB_AGE_DEFAULT;
|
|
|
|
if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
|
|
vxlan->flags |= VXLAN_F_PROXY;
|
|
|
|
if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
|
|
vxlan->flags |= VXLAN_F_RSC;
|
|
|
|
if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
|
|
vxlan->flags |= VXLAN_F_L2MISS;
|
|
|
|
if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
|
|
vxlan->flags |= VXLAN_F_L3MISS;
|
|
|
|
if (data[IFLA_VXLAN_LIMIT])
|
|
vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
|
|
|
|
if (data[IFLA_VXLAN_PORT_RANGE]) {
|
|
const struct ifla_vxlan_port_range *p
|
|
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
|
|
vxlan->port_min = ntohs(p->low);
|
|
vxlan->port_max = ntohs(p->high);
|
|
}
|
|
|
|
if (data[IFLA_VXLAN_PORT])
|
|
vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
|
|
|
|
if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
|
|
vxlan->flags |= VXLAN_F_UDP_CSUM;
|
|
|
|
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
|
|
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
|
|
vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
|
|
|
|
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
|
|
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
|
|
vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
|
|
|
|
if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
|
|
pr_info("duplicate VNI %u\n", vni);
|
|
return -EEXIST;
|
|
}
|
|
|
|
dev->ethtool_ops = &vxlan_ethtool_ops;
|
|
|
|
/* create an fdb entry for a valid default destination */
|
|
if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
|
|
err = vxlan_fdb_create(vxlan, all_zeros_mac,
|
|
&vxlan->default_dst.remote_ip,
|
|
NUD_REACHABLE|NUD_PERMANENT,
|
|
NLM_F_EXCL|NLM_F_CREATE,
|
|
vxlan->dst_port,
|
|
vxlan->default_dst.remote_vni,
|
|
vxlan->default_dst.remote_ifindex,
|
|
NTF_SELF);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
err = register_netdevice(dev);
|
|
if (err) {
|
|
vxlan_fdb_delete_default(vxlan);
|
|
return err;
|
|
}
|
|
|
|
list_add(&vxlan->next, &vn->vxlan_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vxlan_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
|
|
|
spin_lock(&vn->sock_lock);
|
|
if (!hlist_unhashed(&vxlan->hlist))
|
|
hlist_del_rcu(&vxlan->hlist);
|
|
spin_unlock(&vn->sock_lock);
|
|
|
|
list_del(&vxlan->next);
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static size_t vxlan_get_size(const struct net_device *dev)
|
|
{
|
|
|
|
return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
|
|
nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
|
|
nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
|
|
nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
|
|
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 */
|
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
|
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
|
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
|
|
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 (!vxlan_addr_any(&dst->remote_ip)) {
|
|
if (dst->remote_ip.sa.sa_family == AF_INET) {
|
|
if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
|
|
dst->remote_ip.sin.sin_addr.s_addr))
|
|
goto nla_put_failure;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
|
|
&dst->remote_ip.sin6.sin6_addr))
|
|
goto nla_put_failure;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
|
|
goto nla_put_failure;
|
|
|
|
if (!vxlan_addr_any(&vxlan->saddr)) {
|
|
if (vxlan->saddr.sa.sa_family == AF_INET) {
|
|
if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
|
|
vxlan->saddr.sin.sin_addr.s_addr))
|
|
goto nla_put_failure;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
|
|
&vxlan->saddr.sin6.sin6_addr))
|
|
goto nla_put_failure;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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) ||
|
|
nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
|
|
!!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
|
|
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
|
|
!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
|
|
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
|
|
!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
|
|
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 void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
|
|
struct net_device *dev)
|
|
{
|
|
struct vxlan_dev *vxlan, *next;
|
|
LIST_HEAD(list_kill);
|
|
|
|
list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
|
|
struct vxlan_rdst *dst = &vxlan->default_dst;
|
|
|
|
/* In case we created vxlan device with carrier
|
|
* and we loose the carrier due to module unload
|
|
* we also need to remove vxlan device. In other
|
|
* cases, it's not necessary and remote_ifindex
|
|
* is 0 here, so no matches.
|
|
*/
|
|
if (dst->remote_ifindex == dev->ifindex)
|
|
vxlan_dellink(vxlan->dev, &list_kill);
|
|
}
|
|
|
|
unregister_netdevice_many(&list_kill);
|
|
}
|
|
|
|
static int vxlan_lowerdev_event(struct notifier_block *unused,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
|
|
|
|
if (event == NETDEV_UNREGISTER)
|
|
vxlan_handle_lowerdev_unregister(vn, dev);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block vxlan_notifier_block __read_mostly = {
|
|
.notifier_call = vxlan_lowerdev_event,
|
|
};
|
|
|
|
static __net_init int vxlan_init_net(struct net *net)
|
|
{
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
unsigned int h;
|
|
|
|
INIT_LIST_HEAD(&vn->vxlan_list);
|
|
spin_lock_init(&vn->sock_lock);
|
|
|
|
for (h = 0; h < PORT_HASH_SIZE; ++h)
|
|
INIT_HLIST_HEAD(&vn->sock_list[h]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit vxlan_exit_net(struct net *net)
|
|
{
|
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
struct vxlan_dev *vxlan, *next;
|
|
struct net_device *dev, *aux;
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
for_each_netdev_safe(net, dev, aux)
|
|
if (dev->rtnl_link_ops == &vxlan_link_ops)
|
|
unregister_netdevice_queue(dev, &list);
|
|
|
|
list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
|
|
/* If vxlan->dev is in the same netns, it has already been added
|
|
* to the list by the previous loop.
|
|
*/
|
|
if (!net_eq(dev_net(vxlan->dev), net))
|
|
unregister_netdevice_queue(dev, &list);
|
|
}
|
|
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations vxlan_net_ops = {
|
|
.init = vxlan_init_net,
|
|
.exit = vxlan_exit_net,
|
|
.id = &vxlan_net_id,
|
|
.size = sizeof(struct vxlan_net),
|
|
};
|
|
|
|
static int __init vxlan_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
vxlan_wq = alloc_workqueue("vxlan", 0, 0);
|
|
if (!vxlan_wq)
|
|
return -ENOMEM;
|
|
|
|
get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
|
|
|
|
rc = register_pernet_subsys(&vxlan_net_ops);
|
|
if (rc)
|
|
goto out1;
|
|
|
|
rc = register_netdevice_notifier(&vxlan_notifier_block);
|
|
if (rc)
|
|
goto out2;
|
|
|
|
rc = rtnl_link_register(&vxlan_link_ops);
|
|
if (rc)
|
|
goto out3;
|
|
|
|
return 0;
|
|
out3:
|
|
unregister_netdevice_notifier(&vxlan_notifier_block);
|
|
out2:
|
|
unregister_pernet_subsys(&vxlan_net_ops);
|
|
out1:
|
|
destroy_workqueue(vxlan_wq);
|
|
return rc;
|
|
}
|
|
late_initcall(vxlan_init_module);
|
|
|
|
static void __exit vxlan_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&vxlan_link_ops);
|
|
unregister_netdevice_notifier(&vxlan_notifier_block);
|
|
destroy_workqueue(vxlan_wq);
|
|
unregister_pernet_subsys(&vxlan_net_ops);
|
|
/* rcu_barrier() is called by netns */
|
|
}
|
|
module_exit(vxlan_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(VXLAN_VERSION);
|
|
MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
|
|
MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
|
|
MODULE_ALIAS_RTNL_LINK("vxlan");
|