/*
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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/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/if_ether.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/icmp.h>
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#include <net/rtnetlink.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/tun_proto.h>
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#include <net/vxlan.h>
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#if IS_ENABLED(CONFIG_IPV6)
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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 FDB_AGE_DEFAULT 300 /* 5 min */
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#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
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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 unsigned int vxlan_net_id;
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static struct rtnl_link_ops vxlan_link_ops;
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static const u8 all_zeros_mac[ETH_ALEN + 2];
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static int vxlan_sock_add(struct vxlan_dev *vxlan);
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static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
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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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/* 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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u8 eth_addr[ETH_ALEN];
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u16 state; /* see ndm_state */
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__be32 vni;
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u8 flags; /* see ndm_flags */
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};
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/* salt for hash table */
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static u32 vxlan_salt __read_mostly;
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static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
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{
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return vs->flags & VXLAN_F_COLLECT_METADATA ||
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ip_tunnel_collect_metadata();
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}
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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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ip->sin6.sin6_addr = nla_get_in6_addr(nla);
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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_in_addr(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_in6_addr(skb, attr, &ip->sin6.sin6_addr);
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else
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return nla_put_in_addr(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_in_addr(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_in_addr(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, __be32 vni)
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{
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return &vs->vni_list[hash_32((__force u32)vni, 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, address family and UDP port
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* and enabled unshareable flags.
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*/
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static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
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__be16 port, u32 flags)
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{
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struct vxlan_sock *vs;
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flags &= VXLAN_F_RCV_FLAGS;
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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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vxlan_get_sk_family(vs) == family &&
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vs->flags == flags)
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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, int ifindex,
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__be32 vni)
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{
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struct vxlan_dev_node *node;
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/* For flow based devices, map all packets to VNI 0 */
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if (vs->flags & VXLAN_F_COLLECT_METADATA)
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vni = 0;
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hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
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if (node->vxlan->default_dst.remote_vni != vni)
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continue;
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if (IS_ENABLED(CONFIG_IPV6)) {
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const struct vxlan_config *cfg = &node->vxlan->cfg;
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if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
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cfg->remote_ifindex != ifindex)
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continue;
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}
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return node->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, int ifindex,
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__be32 vni, sa_family_t family,
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__be16 port, u32 flags)
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{
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struct vxlan_sock *vs;
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vs = vxlan_find_sock(net, family, port, flags);
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if (!vs)
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return NULL;
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return vxlan_vs_find_vni(vs, ifindex, vni);
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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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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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ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
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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 (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
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nla_put_s32(skb, NDA_LINK_NETNSID,
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peernet2id(dev_net(vxlan->dev), vxlan->net)))
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goto nla_put_failure;
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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->cfg.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, be32_to_cpu(rdst->remote_vni)))
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goto nla_put_failure;
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if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
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nla_put_u32(skb, NDA_SRC_VNI,
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be32_to_cpu(fdb->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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nlmsg_end(skb, nlh);
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return 0;
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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(__s32)) /* NDA_LINK_NETNSID */
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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 = cpu_to_be32(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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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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/* Hash Ethernet address */
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static u32 eth_hash(const unsigned char *addr)
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{
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u64 value = get_unaligned((u64 *)addr);
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/* only want 6 bytes */
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#ifdef __BIG_ENDIAN
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value >>= 16;
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#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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static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
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{
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/* use 1 byte of OUI and 3 bytes of NIC */
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u32 key = get_unaligned((u32 *)(addr + 2));
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return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
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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, __be32 vni)
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{
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if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
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return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
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else
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return &vxlan->fdb_head[eth_hash(mac)];
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}
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/* Look up Ethernet address in forwarding table */
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static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
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const u8 *mac, __be32 vni)
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{
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struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
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struct vxlan_fdb *f;
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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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if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
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if (vni == f->vni)
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return f;
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} else {
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return f;
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}
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}
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}
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return NULL;
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}
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static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
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const u8 *mac, __be32 vni)
|
{
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struct vxlan_fdb *f;
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f = __vxlan_find_mac(vxlan, mac, vni);
|
if (f)
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f->used = jiffies;
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|
return f;
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}
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/* caller should hold vxlan->hash_lock */
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static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
|
union vxlan_addr *ip, __be16 port,
|
__be32 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, __be32 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;
|
|
dst_cache_reset(&rd->dst_cache);
|
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, __be32 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;
|
|
if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
|
kfree(rd);
|
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 vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
|
unsigned int off,
|
struct vxlanhdr *vh, size_t hdrlen,
|
__be32 vni_field,
|
struct gro_remcsum *grc,
|
bool nopartial)
|
{
|
size_t start, offset;
|
|
if (skb->remcsum_offload)
|
return vh;
|
|
if (!NAPI_GRO_CB(skb)->csum_valid)
|
return NULL;
|
|
start = vxlan_rco_start(vni_field);
|
offset = start + vxlan_rco_offset(vni_field);
|
|
vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
|
start, offset, grc, nopartial);
|
|
skb->remcsum_offload = 1;
|
|
return vh;
|
}
|
|
static struct sk_buff *vxlan_gro_receive(struct sock *sk,
|
struct list_head *head,
|
struct sk_buff *skb)
|
{
|
struct sk_buff *pp = NULL;
|
struct sk_buff *p;
|
struct vxlanhdr *vh, *vh2;
|
unsigned int hlen, off_vx;
|
int flush = 1;
|
struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
|
__be32 flags;
|
struct gro_remcsum grc;
|
|
skb_gro_remcsum_init(&grc);
|
|
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_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
|
|
flags = vh->vx_flags;
|
|
if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
|
vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
|
vh->vx_vni, &grc,
|
!!(vs->flags &
|
VXLAN_F_REMCSUM_NOPARTIAL));
|
|
if (!vh)
|
goto out;
|
}
|
|
skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
|
|
list_for_each_entry(p, head, list) {
|
if (!NAPI_GRO_CB(p)->same_flow)
|
continue;
|
|
vh2 = (struct vxlanhdr *)(p->data + off_vx);
|
if (vh->vx_flags != vh2->vx_flags ||
|
vh->vx_vni != vh2->vx_vni) {
|
NAPI_GRO_CB(p)->same_flow = 0;
|
continue;
|
}
|
}
|
|
pp = call_gro_receive(eth_gro_receive, head, skb);
|
flush = 0;
|
|
out:
|
skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
|
|
return pp;
|
}
|
|
static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
|
{
|
/* Sets 'skb->inner_mac_header' since we are always called with
|
* 'skb->encapsulation' set.
|
*/
|
return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
|
}
|
|
static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
|
const u8 *mac, __u16 state,
|
__be32 src_vni, __u8 ndm_flags)
|
{
|
struct vxlan_fdb *f;
|
|
f = kmalloc(sizeof(*f), GFP_ATOMIC);
|
if (!f)
|
return NULL;
|
f->state = state;
|
f->flags = ndm_flags;
|
f->updated = f->used = jiffies;
|
f->vni = src_vni;
|
INIT_LIST_HEAD(&f->remotes);
|
memcpy(f->eth_addr, mac, ETH_ALEN);
|
|
return f;
|
}
|
|
static int vxlan_fdb_create(struct vxlan_dev *vxlan,
|
const u8 *mac, union vxlan_addr *ip,
|
__u16 state, __be16 port, __be32 src_vni,
|
__be32 vni, __u32 ifindex, __u8 ndm_flags,
|
struct vxlan_fdb **fdb)
|
{
|
struct vxlan_rdst *rd = NULL;
|
struct vxlan_fdb *f;
|
int rc;
|
|
if (vxlan->cfg.addrmax &&
|
vxlan->addrcnt >= vxlan->cfg.addrmax)
|
return -ENOSPC;
|
|
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
|
f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
|
if (!f)
|
return -ENOMEM;
|
|
rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
|
if (rc < 0) {
|
kfree(f);
|
return rc;
|
}
|
|
++vxlan->addrcnt;
|
hlist_add_head_rcu(&f->hlist,
|
vxlan_fdb_head(vxlan, mac, src_vni));
|
|
*fdb = f;
|
|
return 0;
|
}
|
|
/* Add new entry to forwarding table -- assumes lock held */
|
static int vxlan_fdb_update(struct vxlan_dev *vxlan,
|
const u8 *mac, union vxlan_addr *ip,
|
__u16 state, __u16 flags,
|
__be16 port, __be32 src_vni, __be32 vni,
|
__u32 ifindex, __u8 ndm_flags)
|
{
|
struct vxlan_rdst *rd = NULL;
|
struct vxlan_fdb *f;
|
int notify = 0;
|
int rc;
|
|
f = __vxlan_find_mac(vxlan, mac, src_vni);
|
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))) {
|
notify |= vxlan_fdb_replace(f, ip, port, vni,
|
ifindex);
|
} else
|
return -EOPNOTSUPP;
|
}
|
if ((flags & NLM_F_APPEND) &&
|
(is_multicast_ether_addr(f->eth_addr) ||
|
is_zero_ether_addr(f->eth_addr))) {
|
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;
|
|
/* 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);
|
rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
|
vni, ifindex, ndm_flags, &f);
|
if (rc < 0)
|
return rc;
|
notify = 1;
|
}
|
|
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) {
|
dst_cache_destroy(&rd->dst_cache);
|
kfree(rd);
|
}
|
kfree(f);
|
}
|
|
static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
|
bool do_notify)
|
{
|
netdev_dbg(vxlan->dev,
|
"delete %pM\n", f->eth_addr);
|
|
--vxlan->addrcnt;
|
if (do_notify)
|
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
|
|
hlist_del_rcu(&f->hlist);
|
call_rcu(&f->rcu, vxlan_fdb_free);
|
}
|
|
static void vxlan_dst_free(struct rcu_head *head)
|
{
|
struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
|
|
dst_cache_destroy(&rd->dst_cache);
|
kfree(rd);
|
}
|
|
static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
|
struct vxlan_rdst *rd)
|
{
|
list_del_rcu(&rd->list);
|
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
|
call_rcu(&rd->rcu, vxlan_dst_free);
|
}
|
|
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
|
union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
|
__be32 *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->cfg.dst_port;
|
}
|
|
if (tb[NDA_VNI]) {
|
if (nla_len(tb[NDA_VNI]) != sizeof(u32))
|
return -EINVAL;
|
*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
|
} else {
|
*vni = vxlan->default_dst.remote_vni;
|
}
|
|
if (tb[NDA_SRC_VNI]) {
|
if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
|
return -EINVAL;
|
*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
|
} else {
|
*src_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 vid, u16 flags)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
/* struct net *net = dev_net(vxlan->dev); */
|
union vxlan_addr ip;
|
__be16 port;
|
__be32 src_vni, vni;
|
u32 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, &src_vni, &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_update(vxlan, addr, &ip, ndm->ndm_state, flags,
|
port, src_vni, vni, ifindex, ndm->ndm_flags);
|
spin_unlock_bh(&vxlan->hash_lock);
|
|
return err;
|
}
|
|
static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
|
const unsigned char *addr, union vxlan_addr ip,
|
__be16 port, __be32 src_vni, __be32 vni,
|
u32 ifindex, u16 vid)
|
{
|
struct vxlan_fdb *f;
|
struct vxlan_rdst *rd = NULL;
|
int err = -ENOENT;
|
|
f = vxlan_find_mac(vxlan, addr, src_vni);
|
if (!f)
|
return err;
|
|
if (!vxlan_addr_any(&ip)) {
|
rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
|
if (!rd)
|
goto out;
|
}
|
|
/* 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)) {
|
vxlan_fdb_dst_destroy(vxlan, f, rd);
|
goto out;
|
}
|
|
vxlan_fdb_destroy(vxlan, f, true);
|
|
out:
|
return 0;
|
}
|
|
/* Delete entry (via netlink) */
|
static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
|
struct net_device *dev,
|
const unsigned char *addr, u16 vid)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
union vxlan_addr ip;
|
__be32 src_vni, vni;
|
__be16 port;
|
u32 ifindex;
|
int err;
|
|
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
|
if (err)
|
return err;
|
|
spin_lock_bh(&vxlan->hash_lock);
|
err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
|
vid);
|
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;
|
int err = 0;
|
|
for (h = 0; h < FDB_HASH_SIZE; ++h) {
|
struct vxlan_fdb *f;
|
|
rcu_read_lock();
|
hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
|
struct vxlan_rdst *rd;
|
|
list_for_each_entry_rcu(rd, &f->remotes, list) {
|
if (*idx < cb->args[2])
|
goto skip;
|
|
err = vxlan_fdb_info(skb, vxlan, f,
|
NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
RTM_NEWNEIGH,
|
NLM_F_MULTI, rd);
|
if (err < 0) {
|
rcu_read_unlock();
|
goto out;
|
}
|
skip:
|
*idx += 1;
|
}
|
}
|
rcu_read_unlock();
|
}
|
out:
|
return err;
|
}
|
|
/* Watch incoming packets to learn mapping between Ethernet address
|
* and Tunnel endpoint.
|
* Return true if packet is bogus and should be dropped.
|
*/
|
static bool vxlan_snoop(struct net_device *dev,
|
union vxlan_addr *src_ip, const u8 *src_mac,
|
u32 src_ifindex, __be32 vni)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct vxlan_fdb *f;
|
u32 ifindex = 0;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (src_ip->sa.sa_family == AF_INET6 &&
|
(ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
|
ifindex = src_ifindex;
|
#endif
|
|
f = vxlan_find_mac(vxlan, src_mac, vni);
|
if (likely(f)) {
|
struct vxlan_rdst *rdst = first_remote_rcu(f);
|
|
if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
|
rdst->remote_ifindex == ifindex))
|
return false;
|
|
/* Don't migrate static entries, drop packets */
|
if (f->state & (NUD_PERMANENT | NUD_NOARP))
|
return true;
|
|
if (net_ratelimit())
|
netdev_info(dev,
|
"%pM migrated from %pIS to %pIS\n",
|
src_mac, &rdst->remote_ip.sa, &src_ip->sa);
|
|
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_update(vxlan, src_mac, src_ip,
|
NUD_REACHABLE,
|
NLM_F_EXCL|NLM_F_CREATE,
|
vxlan->cfg.dst_port,
|
vni,
|
vxlan->default_dst.remote_vni,
|
ifindex, 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;
|
struct vxlan_sock *sock4;
|
#if IS_ENABLED(CONFIG_IPV6)
|
struct vxlan_sock *sock6;
|
#endif
|
unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
|
|
sock4 = rtnl_dereference(dev->vn4_sock);
|
|
/* The vxlan_sock is only used by dev, leaving group has
|
* no effect on other vxlan devices.
|
*/
|
if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
|
return false;
|
#if IS_ENABLED(CONFIG_IPV6)
|
sock6 = rtnl_dereference(dev->vn6_sock);
|
if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
|
return false;
|
#endif
|
|
list_for_each_entry(vxlan, &vn->vxlan_list, next) {
|
if (!netif_running(vxlan->dev) || vxlan == dev)
|
continue;
|
|
if (family == AF_INET &&
|
rtnl_dereference(vxlan->vn4_sock) != sock4)
|
continue;
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (family == AF_INET6 &&
|
rtnl_dereference(vxlan->vn6_sock) != sock6)
|
continue;
|
#endif
|
|
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 bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
|
{
|
struct vxlan_net *vn;
|
|
if (!vs)
|
return false;
|
if (!refcount_dec_and_test(&vs->refcnt))
|
return false;
|
|
vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
|
spin_lock(&vn->sock_lock);
|
hlist_del_rcu(&vs->hlist);
|
udp_tunnel_notify_del_rx_port(vs->sock,
|
(vs->flags & VXLAN_F_GPE) ?
|
UDP_TUNNEL_TYPE_VXLAN_GPE :
|
UDP_TUNNEL_TYPE_VXLAN);
|
spin_unlock(&vn->sock_lock);
|
|
return true;
|
}
|
|
static void vxlan_sock_release(struct vxlan_dev *vxlan)
|
{
|
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
|
#if IS_ENABLED(CONFIG_IPV6)
|
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
|
|
RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
|
#endif
|
|
RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
|
synchronize_net();
|
|
vxlan_vs_del_dev(vxlan);
|
|
if (__vxlan_sock_release_prep(sock4)) {
|
udp_tunnel_sock_release(sock4->sock);
|
kfree(sock4);
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (__vxlan_sock_release_prep(sock6)) {
|
udp_tunnel_sock_release(sock6->sock);
|
kfree(sock6);
|
}
|
#endif
|
}
|
|
/* Update multicast group membership when first VNI on
|
* multicast address is brought up
|
*/
|
static int vxlan_igmp_join(struct vxlan_dev *vxlan)
|
{
|
struct sock *sk;
|
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
|
int ifindex = vxlan->default_dst.remote_ifindex;
|
int ret = -EINVAL;
|
|
if (ip->sa.sa_family == AF_INET) {
|
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
|
struct ip_mreqn mreq = {
|
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
|
.imr_ifindex = ifindex,
|
};
|
|
sk = sock4->sock->sk;
|
lock_sock(sk);
|
ret = ip_mc_join_group(sk, &mreq);
|
release_sock(sk);
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else {
|
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
|
|
sk = sock6->sock->sk;
|
lock_sock(sk);
|
ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
|
&ip->sin6.sin6_addr);
|
release_sock(sk);
|
#endif
|
}
|
|
return ret;
|
}
|
|
/* Inverse of vxlan_igmp_join when last VNI is brought down */
|
static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
|
{
|
struct sock *sk;
|
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
|
int ifindex = vxlan->default_dst.remote_ifindex;
|
int ret = -EINVAL;
|
|
if (ip->sa.sa_family == AF_INET) {
|
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
|
struct ip_mreqn mreq = {
|
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
|
.imr_ifindex = ifindex,
|
};
|
|
sk = sock4->sock->sk;
|
lock_sock(sk);
|
ret = ip_mc_leave_group(sk, &mreq);
|
release_sock(sk);
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else {
|
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
|
|
sk = sock6->sock->sk;
|
lock_sock(sk);
|
ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
|
&ip->sin6.sin6_addr);
|
release_sock(sk);
|
#endif
|
}
|
|
return ret;
|
}
|
|
static bool vxlan_remcsum(struct vxlanhdr *unparsed,
|
struct sk_buff *skb, u32 vxflags)
|
{
|
size_t start, offset;
|
|
if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
|
goto out;
|
|
start = vxlan_rco_start(unparsed->vx_vni);
|
offset = start + vxlan_rco_offset(unparsed->vx_vni);
|
|
if (!pskb_may_pull(skb, offset + sizeof(u16)))
|
return false;
|
|
skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
|
!!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
|
out:
|
unparsed->vx_flags &= ~VXLAN_HF_RCO;
|
unparsed->vx_vni &= VXLAN_VNI_MASK;
|
return true;
|
}
|
|
static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
|
struct sk_buff *skb, u32 vxflags,
|
struct vxlan_metadata *md)
|
{
|
struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
|
struct metadata_dst *tun_dst;
|
|
if (!(unparsed->vx_flags & VXLAN_HF_GBP))
|
goto out;
|
|
md->gbp = ntohs(gbp->policy_id);
|
|
tun_dst = (struct metadata_dst *)skb_dst(skb);
|
if (tun_dst) {
|
tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
|
tun_dst->u.tun_info.options_len = sizeof(*md);
|
}
|
if (gbp->dont_learn)
|
md->gbp |= VXLAN_GBP_DONT_LEARN;
|
|
if (gbp->policy_applied)
|
md->gbp |= VXLAN_GBP_POLICY_APPLIED;
|
|
/* In flow-based mode, GBP is carried in dst_metadata */
|
if (!(vxflags & VXLAN_F_COLLECT_METADATA))
|
skb->mark = md->gbp;
|
out:
|
unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
|
}
|
|
static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
|
__be16 *protocol,
|
struct sk_buff *skb, u32 vxflags)
|
{
|
struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
|
|
/* Need to have Next Protocol set for interfaces in GPE mode. */
|
if (!gpe->np_applied)
|
return false;
|
/* "The initial version is 0. If a receiver does not support the
|
* version indicated it MUST drop the packet.
|
*/
|
if (gpe->version != 0)
|
return false;
|
/* "When the O bit is set to 1, the packet is an OAM packet and OAM
|
* processing MUST occur." However, we don't implement OAM
|
* processing, thus drop the packet.
|
*/
|
if (gpe->oam_flag)
|
return false;
|
|
*protocol = tun_p_to_eth_p(gpe->next_protocol);
|
if (!*protocol)
|
return false;
|
|
unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
|
return true;
|
}
|
|
static bool vxlan_set_mac(struct vxlan_dev *vxlan,
|
struct vxlan_sock *vs,
|
struct sk_buff *skb, __be32 vni)
|
{
|
union vxlan_addr saddr;
|
u32 ifindex = skb->dev->ifindex;
|
|
skb_reset_mac_header(skb);
|
skb->protocol = eth_type_trans(skb, vxlan->dev);
|
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
|
|
/* Ignore packet loops (and multicast echo) */
|
if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
|
return false;
|
|
/* Get address from the outer IP header */
|
if (vxlan_get_sk_family(vs) == AF_INET) {
|
saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
|
saddr.sa.sa_family = AF_INET;
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else {
|
saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
|
saddr.sa.sa_family = AF_INET6;
|
#endif
|
}
|
|
if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
|
vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
|
return false;
|
|
return true;
|
}
|
|
static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
|
struct sk_buff *skb)
|
{
|
int err = 0;
|
|
if (vxlan_get_sk_family(vs) == AF_INET)
|
err = IP_ECN_decapsulate(oiph, skb);
|
#if IS_ENABLED(CONFIG_IPV6)
|
else
|
err = IP6_ECN_decapsulate(oiph, skb);
|
#endif
|
|
if (unlikely(err) && log_ecn_error) {
|
if (vxlan_get_sk_family(vs) == AF_INET)
|
net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
|
&((struct iphdr *)oiph)->saddr,
|
((struct iphdr *)oiph)->tos);
|
else
|
net_info_ratelimited("non-ECT from %pI6\n",
|
&((struct ipv6hdr *)oiph)->saddr);
|
}
|
return err <= 1;
|
}
|
|
/* Callback from net/ipv4/udp.c to receive packets */
|
static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
|
{
|
struct pcpu_sw_netstats *stats;
|
struct vxlan_dev *vxlan;
|
struct vxlan_sock *vs;
|
struct vxlanhdr unparsed;
|
struct vxlan_metadata _md;
|
struct vxlan_metadata *md = &_md;
|
__be16 protocol = htons(ETH_P_TEB);
|
bool raw_proto = false;
|
void *oiph;
|
__be32 vni = 0;
|
|
/* Need UDP and VXLAN header to be present */
|
if (!pskb_may_pull(skb, VXLAN_HLEN))
|
goto drop;
|
|
unparsed = *vxlan_hdr(skb);
|
/* VNI flag always required to be set */
|
if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
|
netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
|
ntohl(vxlan_hdr(skb)->vx_flags),
|
ntohl(vxlan_hdr(skb)->vx_vni));
|
/* Return non vxlan pkt */
|
goto drop;
|
}
|
unparsed.vx_flags &= ~VXLAN_HF_VNI;
|
unparsed.vx_vni &= ~VXLAN_VNI_MASK;
|
|
vs = rcu_dereference_sk_user_data(sk);
|
if (!vs)
|
goto drop;
|
|
vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
|
|
vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
|
if (!vxlan)
|
goto drop;
|
|
/* For backwards compatibility, only allow reserved fields to be
|
* used by VXLAN extensions if explicitly requested.
|
*/
|
if (vs->flags & VXLAN_F_GPE) {
|
if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
|
goto drop;
|
raw_proto = true;
|
}
|
|
if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
|
!net_eq(vxlan->net, dev_net(vxlan->dev))))
|
goto drop;
|
|
if (vxlan_collect_metadata(vs)) {
|
struct metadata_dst *tun_dst;
|
|
tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
|
key32_to_tunnel_id(vni), sizeof(*md));
|
|
if (!tun_dst)
|
goto drop;
|
|
md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
|
|
skb_dst_set(skb, (struct dst_entry *)tun_dst);
|
} else {
|
memset(md, 0, sizeof(*md));
|
}
|
|
if (vs->flags & VXLAN_F_REMCSUM_RX)
|
if (!vxlan_remcsum(&unparsed, skb, vs->flags))
|
goto drop;
|
if (vs->flags & VXLAN_F_GBP)
|
vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
|
/* Note that GBP and GPE can never be active together. This is
|
* ensured in vxlan_dev_configure.
|
*/
|
|
if (unparsed.vx_flags || unparsed.vx_vni) {
|
/* If there are any unprocessed flags remaining treat
|
* this as a malformed packet. This behavior diverges from
|
* VXLAN RFC (RFC7348) which stipulates that bits in reserved
|
* in reserved fields are to be ignored. The approach here
|
* maintains compatibility with previous stack code, and also
|
* is more robust and provides a little more security in
|
* adding extensions to VXLAN.
|
*/
|
goto drop;
|
}
|
|
if (!raw_proto) {
|
if (!vxlan_set_mac(vxlan, vs, skb, vni))
|
goto drop;
|
} else {
|
skb_reset_mac_header(skb);
|
skb->dev = vxlan->dev;
|
skb->pkt_type = PACKET_HOST;
|
}
|
|
oiph = skb_network_header(skb);
|
skb_reset_network_header(skb);
|
|
if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
|
++vxlan->dev->stats.rx_frame_errors;
|
++vxlan->dev->stats.rx_errors;
|
goto drop;
|
}
|
|
rcu_read_lock();
|
|
if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
|
rcu_read_unlock();
|
atomic_long_inc(&vxlan->dev->rx_dropped);
|
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);
|
|
gro_cells_receive(&vxlan->gro_cells, skb);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
drop:
|
/* Consume bad packet */
|
kfree_skb(skb);
|
return 0;
|
}
|
|
static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
|
{
|
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, vni);
|
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->cfg.flags & VXLAN_F_L3MISS) {
|
union vxlan_addr ipa = {
|
.sin.sin_addr.s_addr = tip,
|
.sin.sin_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 || !pskb_may_pull(request, request->len))
|
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_reset_mac_header(reply);
|
|
ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
|
|
daddr = eth_hdr(request)->h_source;
|
ns_olen = request->len - skb_network_offset(request) -
|
sizeof(struct ipv6hdr) - sizeof(*ns);
|
for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
|
if (!ns->opt[i + 1]) {
|
kfree_skb(reply);
|
return NULL;
|
}
|
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_reset_network_header(reply);
|
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_reset_transport_header(reply);
|
|
/* Neighbor Advertisement */
|
na = skb_put_zero(reply, 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, __be32 vni)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
const struct in6_addr *daddr;
|
const struct ipv6hdr *iphdr;
|
struct inet6_dev *in6_dev;
|
struct neighbour *n;
|
struct nd_msg *msg;
|
|
rcu_read_lock();
|
in6_dev = __in6_dev_get(dev);
|
if (!in6_dev)
|
goto out;
|
|
iphdr = ipv6_hdr(skb);
|
daddr = &iphdr->daddr;
|
msg = (struct nd_msg *)(iphdr + 1);
|
|
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, vni);
|
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->cfg.flags & VXLAN_F_L3MISS) {
|
union vxlan_addr ipa = {
|
.sin6.sin6_addr = msg->target,
|
.sin6.sin6_family = AF_INET6,
|
};
|
|
vxlan_ip_miss(dev, &ipa);
|
}
|
|
out:
|
rcu_read_unlock();
|
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->cfg.flags & VXLAN_F_L3MISS)) {
|
union vxlan_addr ipa = {
|
.sin.sin_addr.s_addr = pip->daddr,
|
.sin.sin_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->cfg.flags & VXLAN_F_L3MISS)) {
|
union vxlan_addr ipa = {
|
.sin6.sin6_addr = pip6->daddr,
|
.sin6.sin6_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 void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
|
struct vxlan_metadata *md)
|
{
|
struct vxlanhdr_gbp *gbp;
|
|
if (!md->gbp)
|
return;
|
|
gbp = (struct vxlanhdr_gbp *)vxh;
|
vxh->vx_flags |= VXLAN_HF_GBP;
|
|
if (md->gbp & VXLAN_GBP_DONT_LEARN)
|
gbp->dont_learn = 1;
|
|
if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
|
gbp->policy_applied = 1;
|
|
gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
|
}
|
|
static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
|
__be16 protocol)
|
{
|
struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
|
|
gpe->np_applied = 1;
|
gpe->next_protocol = tun_p_from_eth_p(protocol);
|
if (!gpe->next_protocol)
|
return -EPFNOSUPPORT;
|
return 0;
|
}
|
|
static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
|
int iphdr_len, __be32 vni,
|
struct vxlan_metadata *md, u32 vxflags,
|
bool udp_sum)
|
{
|
struct vxlanhdr *vxh;
|
int min_headroom;
|
int err;
|
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
|
__be16 inner_protocol = htons(ETH_P_TEB);
|
|
if ((vxflags & VXLAN_F_REMCSUM_TX) &&
|
skb->ip_summed == CHECKSUM_PARTIAL) {
|
int csum_start = skb_checksum_start_offset(skb);
|
|
if (csum_start <= VXLAN_MAX_REMCSUM_START &&
|
!(csum_start & VXLAN_RCO_SHIFT_MASK) &&
|
(skb->csum_offset == offsetof(struct udphdr, check) ||
|
skb->csum_offset == offsetof(struct tcphdr, check)))
|
type |= SKB_GSO_TUNNEL_REMCSUM;
|
}
|
|
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
|
+ VXLAN_HLEN + iphdr_len;
|
|
/* Need space for new headers (invalidates iph ptr) */
|
err = skb_cow_head(skb, min_headroom);
|
if (unlikely(err))
|
return err;
|
|
err = iptunnel_handle_offloads(skb, type);
|
if (err)
|
return err;
|
|
vxh = __skb_push(skb, sizeof(*vxh));
|
vxh->vx_flags = VXLAN_HF_VNI;
|
vxh->vx_vni = vxlan_vni_field(vni);
|
|
if (type & SKB_GSO_TUNNEL_REMCSUM) {
|
unsigned int start;
|
|
start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
|
vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
|
vxh->vx_flags |= VXLAN_HF_RCO;
|
|
if (!skb_is_gso(skb)) {
|
skb->ip_summed = CHECKSUM_NONE;
|
skb->encapsulation = 0;
|
}
|
}
|
|
if (vxflags & VXLAN_F_GBP)
|
vxlan_build_gbp_hdr(vxh, vxflags, md);
|
if (vxflags & VXLAN_F_GPE) {
|
err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
|
if (err < 0)
|
return err;
|
inner_protocol = skb->protocol;
|
}
|
|
skb_set_inner_protocol(skb, inner_protocol);
|
return 0;
|
}
|
|
static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
|
struct vxlan_sock *sock4,
|
struct sk_buff *skb, int oif, u8 tos,
|
__be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
|
struct dst_cache *dst_cache,
|
const struct ip_tunnel_info *info)
|
{
|
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
|
struct rtable *rt = NULL;
|
struct flowi4 fl4;
|
|
if (!sock4)
|
return ERR_PTR(-EIO);
|
|
if (tos && !info)
|
use_cache = false;
|
if (use_cache) {
|
rt = dst_cache_get_ip4(dst_cache, saddr);
|
if (rt)
|
return rt;
|
}
|
|
memset(&fl4, 0, sizeof(fl4));
|
fl4.flowi4_oif = oif;
|
fl4.flowi4_tos = RT_TOS(tos);
|
fl4.flowi4_mark = skb->mark;
|
fl4.flowi4_proto = IPPROTO_UDP;
|
fl4.daddr = daddr;
|
fl4.saddr = *saddr;
|
fl4.fl4_dport = dport;
|
fl4.fl4_sport = sport;
|
|
rt = ip_route_output_key(vxlan->net, &fl4);
|
if (likely(!IS_ERR(rt))) {
|
if (rt->dst.dev == dev) {
|
netdev_dbg(dev, "circular route to %pI4\n", &daddr);
|
ip_rt_put(rt);
|
return ERR_PTR(-ELOOP);
|
}
|
|
*saddr = fl4.saddr;
|
if (use_cache)
|
dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
|
} else {
|
netdev_dbg(dev, "no route to %pI4\n", &daddr);
|
return ERR_PTR(-ENETUNREACH);
|
}
|
return rt;
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
|
struct net_device *dev,
|
struct vxlan_sock *sock6,
|
struct sk_buff *skb, int oif, u8 tos,
|
__be32 label,
|
const struct in6_addr *daddr,
|
struct in6_addr *saddr,
|
__be16 dport, __be16 sport,
|
struct dst_cache *dst_cache,
|
const struct ip_tunnel_info *info)
|
{
|
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
|
struct dst_entry *ndst;
|
struct flowi6 fl6;
|
|
if (!sock6)
|
return ERR_PTR(-EIO);
|
|
if (tos && !info)
|
use_cache = false;
|
if (use_cache) {
|
ndst = dst_cache_get_ip6(dst_cache, saddr);
|
if (ndst)
|
return ndst;
|
}
|
|
memset(&fl6, 0, sizeof(fl6));
|
fl6.flowi6_oif = oif;
|
fl6.daddr = *daddr;
|
fl6.saddr = *saddr;
|
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
|
fl6.flowi6_mark = skb->mark;
|
fl6.flowi6_proto = IPPROTO_UDP;
|
fl6.fl6_dport = dport;
|
fl6.fl6_sport = sport;
|
|
ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
|
&fl6, NULL);
|
if (unlikely(IS_ERR(ndst))) {
|
netdev_dbg(dev, "no route to %pI6\n", daddr);
|
return ERR_PTR(-ENETUNREACH);
|
}
|
|
if (unlikely(ndst->dev == dev)) {
|
netdev_dbg(dev, "circular route to %pI6\n", daddr);
|
dst_release(ndst);
|
return ERR_PTR(-ELOOP);
|
}
|
|
*saddr = fl6.saddr;
|
if (use_cache)
|
dst_cache_set_ip6(dst_cache, ndst, saddr);
|
return ndst;
|
}
|
#endif
|
|
/* 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, __be32 vni)
|
{
|
struct pcpu_sw_netstats *tx_stats, *rx_stats;
|
union vxlan_addr loopback;
|
union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
|
struct net_device *dev;
|
int len = skb->len;
|
|
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
|
}
|
|
rcu_read_lock();
|
dev = skb->dev;
|
if (unlikely(!(dev->flags & IFF_UP))) {
|
kfree_skb(skb);
|
goto drop;
|
}
|
|
if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
|
vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
|
|
u64_stats_update_begin(&tx_stats->syncp);
|
tx_stats->tx_packets++;
|
tx_stats->tx_bytes += 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 += len;
|
u64_stats_update_end(&rx_stats->syncp);
|
} else {
|
drop:
|
dev->stats.rx_dropped++;
|
}
|
rcu_read_unlock();
|
}
|
|
static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
|
struct vxlan_dev *vxlan,
|
union vxlan_addr *daddr,
|
__be16 dst_port, int dst_ifindex, __be32 vni,
|
struct dst_entry *dst,
|
u32 rt_flags)
|
{
|
#if IS_ENABLED(CONFIG_IPV6)
|
/* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
|
* RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
|
* we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
|
*/
|
BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
|
#endif
|
/* Bypass encapsulation if the destination is local */
|
if (rt_flags & RTCF_LOCAL &&
|
!(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
|
struct vxlan_dev *dst_vxlan;
|
|
dst_release(dst);
|
dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
|
daddr->sa.sa_family, dst_port,
|
vxlan->cfg.flags);
|
if (!dst_vxlan) {
|
dev->stats.tx_errors++;
|
kfree_skb(skb);
|
|
return -ENOENT;
|
}
|
vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
|
return 1;
|
}
|
|
return 0;
|
}
|
|
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
|
__be32 default_vni, struct vxlan_rdst *rdst,
|
bool did_rsc)
|
{
|
struct dst_cache *dst_cache;
|
struct ip_tunnel_info *info;
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
const struct iphdr *old_iph = ip_hdr(skb);
|
union vxlan_addr *dst;
|
union vxlan_addr remote_ip, local_ip;
|
struct vxlan_metadata _md;
|
struct vxlan_metadata *md = &_md;
|
__be16 src_port = 0, dst_port;
|
struct dst_entry *ndst = NULL;
|
__be32 vni, label;
|
__u8 tos, ttl;
|
int ifindex;
|
int err;
|
u32 flags = vxlan->cfg.flags;
|
bool udp_sum = false;
|
bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
|
|
info = skb_tunnel_info(skb);
|
|
if (rdst) {
|
dst = &rdst->remote_ip;
|
if (vxlan_addr_any(dst)) {
|
if (did_rsc) {
|
/* short-circuited back to local bridge */
|
vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
|
return;
|
}
|
goto drop;
|
}
|
|
dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
|
vni = (rdst->remote_vni) ? : default_vni;
|
ifindex = rdst->remote_ifindex;
|
local_ip = vxlan->cfg.saddr;
|
dst_cache = &rdst->dst_cache;
|
md->gbp = skb->mark;
|
if (flags & VXLAN_F_TTL_INHERIT) {
|
ttl = ip_tunnel_get_ttl(old_iph, skb);
|
} else {
|
ttl = vxlan->cfg.ttl;
|
if (!ttl && vxlan_addr_multicast(dst))
|
ttl = 1;
|
}
|
|
tos = vxlan->cfg.tos;
|
if (tos == 1)
|
tos = ip_tunnel_get_dsfield(old_iph, skb);
|
|
if (dst->sa.sa_family == AF_INET)
|
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
|
else
|
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
|
label = vxlan->cfg.label;
|
} else {
|
if (!info) {
|
WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
|
dev->name);
|
goto drop;
|
}
|
remote_ip.sa.sa_family = ip_tunnel_info_af(info);
|
if (remote_ip.sa.sa_family == AF_INET) {
|
remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
|
local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
|
} else {
|
remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
|
local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
|
}
|
dst = &remote_ip;
|
dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
|
vni = tunnel_id_to_key32(info->key.tun_id);
|
ifindex = 0;
|
dst_cache = &info->dst_cache;
|
if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
|
if (info->options_len < sizeof(*md))
|
goto drop;
|
md = ip_tunnel_info_opts(info);
|
}
|
ttl = info->key.ttl;
|
tos = info->key.tos;
|
label = info->key.label;
|
udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
|
}
|
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
|
vxlan->cfg.port_max, true);
|
|
rcu_read_lock();
|
if (dst->sa.sa_family == AF_INET) {
|
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
|
struct rtable *rt;
|
__be16 df = 0;
|
|
rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
|
dst->sin.sin_addr.s_addr,
|
&local_ip.sin.sin_addr.s_addr,
|
dst_port, src_port,
|
dst_cache, info);
|
if (IS_ERR(rt)) {
|
err = PTR_ERR(rt);
|
goto tx_error;
|
}
|
|
/* Bypass encapsulation if the destination is local */
|
if (!info) {
|
err = encap_bypass_if_local(skb, dev, vxlan, dst,
|
dst_port, ifindex, vni,
|
&rt->dst, rt->rt_flags);
|
if (err)
|
goto out_unlock;
|
} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
|
df = htons(IP_DF);
|
}
|
|
ndst = &rt->dst;
|
skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
|
|
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
|
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
|
err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
|
vni, md, flags, udp_sum);
|
if (err < 0)
|
goto tx_error;
|
|
udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
|
dst->sin.sin_addr.s_addr, tos, ttl, df,
|
src_port, dst_port, xnet, !udp_sum);
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else {
|
struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
|
|
ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
|
label, &dst->sin6.sin6_addr,
|
&local_ip.sin6.sin6_addr,
|
dst_port, src_port,
|
dst_cache, info);
|
if (IS_ERR(ndst)) {
|
err = PTR_ERR(ndst);
|
ndst = NULL;
|
goto tx_error;
|
}
|
|
if (!info) {
|
u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
|
|
err = encap_bypass_if_local(skb, dev, vxlan, dst,
|
dst_port, ifindex, vni,
|
ndst, rt6i_flags);
|
if (err)
|
goto out_unlock;
|
}
|
|
skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
|
|
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
|
ttl = ttl ? : ip6_dst_hoplimit(ndst);
|
skb_scrub_packet(skb, xnet);
|
err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
|
vni, md, flags, udp_sum);
|
if (err < 0)
|
goto tx_error;
|
|
udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
|
&local_ip.sin6.sin6_addr,
|
&dst->sin6.sin6_addr, tos, ttl,
|
label, src_port, dst_port, !udp_sum);
|
#endif
|
}
|
out_unlock:
|
rcu_read_unlock();
|
return;
|
|
drop:
|
dev->stats.tx_dropped++;
|
dev_kfree_skb(skb);
|
return;
|
|
tx_error:
|
rcu_read_unlock();
|
if (err == -ELOOP)
|
dev->stats.collisions++;
|
else if (err == -ENETUNREACH)
|
dev->stats.tx_carrier_errors++;
|
dst_release(ndst);
|
dev->stats.tx_errors++;
|
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 vxlan_rdst *rdst, *fdst = NULL;
|
const struct ip_tunnel_info *info;
|
bool did_rsc = false;
|
struct vxlan_fdb *f;
|
struct ethhdr *eth;
|
__be32 vni = 0;
|
|
info = skb_tunnel_info(skb);
|
|
skb_reset_mac_header(skb);
|
|
if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
|
if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
|
info->mode & IP_TUNNEL_INFO_TX) {
|
vni = tunnel_id_to_key32(info->key.tun_id);
|
} else {
|
if (info && info->mode & IP_TUNNEL_INFO_TX)
|
vxlan_xmit_one(skb, dev, vni, NULL, false);
|
else
|
kfree_skb(skb);
|
return NETDEV_TX_OK;
|
}
|
}
|
|
if (vxlan->cfg.flags & VXLAN_F_PROXY) {
|
eth = eth_hdr(skb);
|
if (ntohs(eth->h_proto) == ETH_P_ARP)
|
return arp_reduce(dev, skb, vni);
|
#if IS_ENABLED(CONFIG_IPV6)
|
else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
|
pskb_may_pull(skb, sizeof(struct ipv6hdr) +
|
sizeof(struct nd_msg)) &&
|
ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
|
struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
|
|
if (m->icmph.icmp6_code == 0 &&
|
m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
|
return neigh_reduce(dev, skb, vni);
|
}
|
#endif
|
}
|
|
eth = eth_hdr(skb);
|
f = vxlan_find_mac(vxlan, eth->h_dest, vni);
|
did_rsc = false;
|
|
if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.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, vni);
|
}
|
|
if (f == NULL) {
|
f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
|
if (f == NULL) {
|
if ((vxlan->cfg.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, vni, rdst, did_rsc);
|
}
|
|
if (fdst)
|
vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
|
else
|
kfree_skb(skb);
|
return NETDEV_TX_OK;
|
}
|
|
/* Walk the forwarding table and purge stale entries */
|
static void vxlan_cleanup(struct timer_list *t)
|
{
|
struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
|
unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
|
unsigned int h;
|
|
if (!netif_running(vxlan->dev))
|
return;
|
|
for (h = 0; h < FDB_HASH_SIZE; ++h) {
|
struct hlist_node *p, *n;
|
|
spin_lock_bh(&vxlan->hash_lock);
|
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 | NUD_NOARP))
|
continue;
|
|
if (f->flags & NTF_EXT_LEARNED)
|
continue;
|
|
timeout = f->used + vxlan->cfg.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, true);
|
} 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_del_dev(struct vxlan_dev *vxlan)
|
{
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
|
spin_lock(&vn->sock_lock);
|
hlist_del_init_rcu(&vxlan->hlist4.hlist);
|
#if IS_ENABLED(CONFIG_IPV6)
|
hlist_del_init_rcu(&vxlan->hlist6.hlist);
|
#endif
|
spin_unlock(&vn->sock_lock);
|
}
|
|
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
|
struct vxlan_dev_node *node)
|
{
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
__be32 vni = vxlan->default_dst.remote_vni;
|
|
node->vxlan = vxlan;
|
spin_lock(&vn->sock_lock);
|
hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
|
spin_unlock(&vn->sock_lock);
|
}
|
|
/* Setup stats when device is created */
|
static int vxlan_init(struct net_device *dev)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
int err;
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
if (!dev->tstats)
|
return -ENOMEM;
|
|
err = gro_cells_init(&vxlan->gro_cells, dev);
|
if (err) {
|
free_percpu(dev->tstats);
|
return err;
|
}
|
|
return 0;
|
}
|
|
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
|
{
|
struct vxlan_fdb *f;
|
|
spin_lock_bh(&vxlan->hash_lock);
|
f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
|
if (f)
|
vxlan_fdb_destroy(vxlan, f, true);
|
spin_unlock_bh(&vxlan->hash_lock);
|
}
|
|
static void vxlan_uninit(struct net_device *dev)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
gro_cells_destroy(&vxlan->gro_cells);
|
|
vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
|
|
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);
|
int ret;
|
|
ret = vxlan_sock_add(vxlan);
|
if (ret < 0)
|
return ret;
|
|
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
|
ret = vxlan_igmp_join(vxlan);
|
if (ret == -EADDRINUSE)
|
ret = 0;
|
if (ret) {
|
vxlan_sock_release(vxlan);
|
return ret;
|
}
|
}
|
|
if (vxlan->cfg.age_interval)
|
mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
|
|
return ret;
|
}
|
|
/* Purge the forwarding table */
|
static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
|
{
|
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);
|
if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
|
continue;
|
/* the all_zeros_mac entry is deleted at vxlan_uninit */
|
if (!is_zero_ether_addr(f->eth_addr))
|
vxlan_fdb_destroy(vxlan, f, true);
|
}
|
}
|
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);
|
int ret = 0;
|
|
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
|
!vxlan_group_used(vn, vxlan))
|
ret = vxlan_igmp_leave(vxlan);
|
|
del_timer_sync(&vxlan->age_timer);
|
|
vxlan_flush(vxlan, false);
|
vxlan_sock_release(vxlan);
|
|
return ret;
|
}
|
|
/* 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 = __dev_get_by_index(vxlan->net,
|
dst->remote_ifindex);
|
bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
|
|
/* This check is different than dev->max_mtu, because it looks at
|
* the lowerdev->mtu, rather than the static dev->max_mtu
|
*/
|
if (lowerdev) {
|
int max_mtu = lowerdev->mtu -
|
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
|
if (new_mtu > max_mtu)
|
return -EINVAL;
|
}
|
|
dev->mtu = new_mtu;
|
return 0;
|
}
|
|
static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct ip_tunnel_info *info = skb_tunnel_info(skb);
|
__be16 sport, dport;
|
|
sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
|
vxlan->cfg.port_max, true);
|
dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
|
|
if (ip_tunnel_info_af(info) == AF_INET) {
|
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
|
struct rtable *rt;
|
|
rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
|
info->key.u.ipv4.dst,
|
&info->key.u.ipv4.src, dport, sport,
|
&info->dst_cache, info);
|
if (IS_ERR(rt))
|
return PTR_ERR(rt);
|
ip_rt_put(rt);
|
} else {
|
#if IS_ENABLED(CONFIG_IPV6)
|
struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
|
struct dst_entry *ndst;
|
|
ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
|
info->key.label, &info->key.u.ipv6.dst,
|
&info->key.u.ipv6.src, dport, sport,
|
&info->dst_cache, info);
|
if (IS_ERR(ndst))
|
return PTR_ERR(ndst);
|
dst_release(ndst);
|
#else /* !CONFIG_IPV6 */
|
return -EPFNOSUPPORT;
|
#endif
|
}
|
info->key.tp_src = sport;
|
info->key.tp_dst = dport;
|
return 0;
|
}
|
|
static const struct net_device_ops vxlan_netdev_ether_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,
|
.ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
|
};
|
|
static const struct net_device_ops vxlan_netdev_raw_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_change_mtu = vxlan_change_mtu,
|
.ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
|
};
|
|
/* Info for udev, that this is a virtual tunnel endpoint */
|
static struct device_type vxlan_type = {
|
.name = "vxlan",
|
};
|
|
/* Calls the ndo_udp_tunnel_add of the caller in order to
|
* supply the listening VXLAN udp ports. Callers are expected
|
* to implement the ndo_udp_tunnel_add.
|
*/
|
static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
|
{
|
struct vxlan_sock *vs;
|
struct net *net = dev_net(dev);
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
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) {
|
unsigned short type;
|
|
if (vs->flags & VXLAN_F_GPE)
|
type = UDP_TUNNEL_TYPE_VXLAN_GPE;
|
else
|
type = UDP_TUNNEL_TYPE_VXLAN;
|
|
if (push)
|
udp_tunnel_push_rx_port(dev, vs->sock, type);
|
else
|
udp_tunnel_drop_rx_port(dev, vs->sock, type);
|
}
|
}
|
spin_unlock(&vn->sock_lock);
|
}
|
|
/* 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);
|
|
dev->needs_free_netdev = true;
|
SET_NETDEV_DEVTYPE(dev, &vxlan_type);
|
|
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->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
|
netif_keep_dst(dev);
|
dev->priv_flags |= IFF_NO_QUEUE;
|
|
/* MTU range: 68 - 65535 */
|
dev->min_mtu = ETH_MIN_MTU;
|
dev->max_mtu = ETH_MAX_MTU;
|
|
INIT_LIST_HEAD(&vxlan->next);
|
spin_lock_init(&vxlan->hash_lock);
|
|
timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
|
|
vxlan->dev = dev;
|
|
for (h = 0; h < FDB_HASH_SIZE; ++h)
|
INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
|
}
|
|
static void vxlan_ether_setup(struct net_device *dev)
|
{
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
|
dev->netdev_ops = &vxlan_netdev_ether_ops;
|
}
|
|
static void vxlan_raw_setup(struct net_device *dev)
|
{
|
dev->header_ops = NULL;
|
dev->type = ARPHRD_NONE;
|
dev->hard_header_len = 0;
|
dev->addr_len = 0;
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
|
dev->netdev_ops = &vxlan_netdev_raw_ops;
|
}
|
|
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_LABEL] = { .type = NLA_U32 },
|
[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_COLLECT_METADATA] = { .type = NLA_U8 },
|
[IFLA_VXLAN_PORT] = { .type = NLA_U16 },
|
[IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
|
[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
|
[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
|
[IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
|
[IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
|
[IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
|
[IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
|
[IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
|
[IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
|
};
|
|
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
if (tb[IFLA_ADDRESS]) {
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
|
"Provided link layer address is not Ethernet");
|
return -EINVAL;
|
}
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
|
"Provided Ethernet address is not unicast");
|
return -EADDRNOTAVAIL;
|
}
|
}
|
|
if (tb[IFLA_MTU]) {
|
u32 mtu = nla_get_u32(tb[IFLA_MTU]);
|
|
if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
|
"MTU must be between 68 and 65535");
|
return -EINVAL;
|
}
|
}
|
|
if (!data) {
|
NL_SET_ERR_MSG(extack,
|
"Required attributes not provided to perform the operation");
|
return -EINVAL;
|
}
|
|
if (data[IFLA_VXLAN_ID]) {
|
u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
|
|
if (id >= VXLAN_N_VID) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
|
"VXLAN ID must be lower than 16777216");
|
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)) {
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
|
"Invalid source port range");
|
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 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_rx_checksums =
|
!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
|
udp_conf.ipv6_v6only = 1;
|
} else {
|
udp_conf.family = AF_INET;
|
}
|
|
udp_conf.local_udp_port = port;
|
|
/* Open UDP socket */
|
err = udp_sock_create(net, &udp_conf, &sock);
|
if (err < 0)
|
return ERR_PTR(err);
|
|
return sock;
|
}
|
|
/* Create new listen socket if needed */
|
static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
|
__be16 port, u32 flags)
|
{
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
struct vxlan_sock *vs;
|
struct socket *sock;
|
unsigned int h;
|
struct udp_tunnel_sock_cfg tunnel_cfg;
|
|
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]);
|
|
sock = vxlan_create_sock(net, ipv6, port, flags);
|
if (IS_ERR(sock)) {
|
kfree(vs);
|
return ERR_CAST(sock);
|
}
|
|
vs->sock = sock;
|
refcount_set(&vs->refcnt, 1);
|
vs->flags = (flags & VXLAN_F_RCV_FLAGS);
|
|
spin_lock(&vn->sock_lock);
|
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
|
udp_tunnel_notify_add_rx_port(sock,
|
(vs->flags & VXLAN_F_GPE) ?
|
UDP_TUNNEL_TYPE_VXLAN_GPE :
|
UDP_TUNNEL_TYPE_VXLAN);
|
spin_unlock(&vn->sock_lock);
|
|
/* Mark socket as an encapsulation socket. */
|
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
|
tunnel_cfg.sk_user_data = vs;
|
tunnel_cfg.encap_type = 1;
|
tunnel_cfg.encap_rcv = vxlan_rcv;
|
tunnel_cfg.encap_destroy = NULL;
|
tunnel_cfg.gro_receive = vxlan_gro_receive;
|
tunnel_cfg.gro_complete = vxlan_gro_complete;
|
|
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
|
|
return vs;
|
}
|
|
static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
|
{
|
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
|
struct vxlan_sock *vs = NULL;
|
struct vxlan_dev_node *node;
|
|
if (!vxlan->cfg.no_share) {
|
spin_lock(&vn->sock_lock);
|
vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
|
vxlan->cfg.dst_port, vxlan->cfg.flags);
|
if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
|
spin_unlock(&vn->sock_lock);
|
return -EBUSY;
|
}
|
spin_unlock(&vn->sock_lock);
|
}
|
if (!vs)
|
vs = vxlan_socket_create(vxlan->net, ipv6,
|
vxlan->cfg.dst_port, vxlan->cfg.flags);
|
if (IS_ERR(vs))
|
return PTR_ERR(vs);
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (ipv6) {
|
rcu_assign_pointer(vxlan->vn6_sock, vs);
|
node = &vxlan->hlist6;
|
} else
|
#endif
|
{
|
rcu_assign_pointer(vxlan->vn4_sock, vs);
|
node = &vxlan->hlist4;
|
}
|
vxlan_vs_add_dev(vs, vxlan, node);
|
return 0;
|
}
|
|
static int vxlan_sock_add(struct vxlan_dev *vxlan)
|
{
|
bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
|
bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
|
bool ipv4 = !ipv6 || metadata;
|
int ret = 0;
|
|
RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
|
#if IS_ENABLED(CONFIG_IPV6)
|
RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
|
if (ipv6) {
|
ret = __vxlan_sock_add(vxlan, true);
|
if (ret < 0 && ret != -EAFNOSUPPORT)
|
ipv4 = false;
|
}
|
#endif
|
if (ipv4)
|
ret = __vxlan_sock_add(vxlan, false);
|
if (ret < 0)
|
vxlan_sock_release(vxlan);
|
return ret;
|
}
|
|
static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
|
struct net_device **lower,
|
struct vxlan_dev *old,
|
struct netlink_ext_ack *extack)
|
{
|
struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
|
struct vxlan_dev *tmp;
|
bool use_ipv6 = false;
|
|
if (conf->flags & VXLAN_F_GPE) {
|
/* For now, allow GPE only together with
|
* COLLECT_METADATA. This can be relaxed later; in such
|
* case, the other side of the PtP link will have to be
|
* provided.
|
*/
|
if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
|
!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
|
NL_SET_ERR_MSG(extack,
|
"VXLAN GPE does not support this combination of attributes");
|
return -EINVAL;
|
}
|
}
|
|
if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
|
/* Unless IPv6 is explicitly requested, assume IPv4 */
|
conf->remote_ip.sa.sa_family = AF_INET;
|
conf->saddr.sa.sa_family = AF_INET;
|
} else if (!conf->remote_ip.sa.sa_family) {
|
conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
|
} else if (!conf->saddr.sa.sa_family) {
|
conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
|
}
|
|
if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
|
NL_SET_ERR_MSG(extack,
|
"Local and remote address must be from the same family");
|
return -EINVAL;
|
}
|
|
if (vxlan_addr_multicast(&conf->saddr)) {
|
NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
|
return -EINVAL;
|
}
|
|
if (conf->saddr.sa.sa_family == AF_INET6) {
|
if (!IS_ENABLED(CONFIG_IPV6)) {
|
NL_SET_ERR_MSG(extack,
|
"IPv6 support not enabled in the kernel");
|
return -EPFNOSUPPORT;
|
}
|
use_ipv6 = true;
|
conf->flags |= VXLAN_F_IPV6;
|
|
if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
|
int local_type =
|
ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
|
int remote_type =
|
ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
|
|
if (local_type & IPV6_ADDR_LINKLOCAL) {
|
if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
|
(remote_type != IPV6_ADDR_ANY)) {
|
NL_SET_ERR_MSG(extack,
|
"Invalid combination of local and remote address scopes");
|
return -EINVAL;
|
}
|
|
conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
|
} else {
|
if (remote_type ==
|
(IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
|
NL_SET_ERR_MSG(extack,
|
"Invalid combination of local and remote address scopes");
|
return -EINVAL;
|
}
|
|
conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
|
}
|
}
|
}
|
|
if (conf->label && !use_ipv6) {
|
NL_SET_ERR_MSG(extack,
|
"Label attribute only applies to IPv6 VXLAN devices");
|
return -EINVAL;
|
}
|
|
if (conf->remote_ifindex) {
|
struct net_device *lowerdev;
|
|
lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
|
if (!lowerdev) {
|
NL_SET_ERR_MSG(extack,
|
"Invalid local interface, device not found");
|
return -ENODEV;
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (use_ipv6) {
|
struct inet6_dev *idev = __in6_dev_get(lowerdev);
|
if (idev && idev->cnf.disable_ipv6) {
|
NL_SET_ERR_MSG(extack,
|
"IPv6 support disabled by administrator");
|
return -EPERM;
|
}
|
}
|
#endif
|
|
*lower = lowerdev;
|
} else {
|
if (vxlan_addr_multicast(&conf->remote_ip)) {
|
NL_SET_ERR_MSG(extack,
|
"Local interface required for multicast remote destination");
|
|
return -EINVAL;
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
|
NL_SET_ERR_MSG(extack,
|
"Local interface required for link-local local/remote addresses");
|
return -EINVAL;
|
}
|
#endif
|
|
*lower = NULL;
|
}
|
|
if (!conf->dst_port) {
|
if (conf->flags & VXLAN_F_GPE)
|
conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
|
else
|
conf->dst_port = htons(vxlan_port);
|
}
|
|
if (!conf->age_interval)
|
conf->age_interval = FDB_AGE_DEFAULT;
|
|
list_for_each_entry(tmp, &vn->vxlan_list, next) {
|
if (tmp == old)
|
continue;
|
|
if (tmp->cfg.vni != conf->vni)
|
continue;
|
if (tmp->cfg.dst_port != conf->dst_port)
|
continue;
|
if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
|
(conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
|
continue;
|
|
if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
|
tmp->cfg.remote_ifindex != conf->remote_ifindex)
|
continue;
|
|
NL_SET_ERR_MSG(extack,
|
"A VXLAN device with the specified VNI already exists");
|
return -EEXIST;
|
}
|
|
return 0;
|
}
|
|
static void vxlan_config_apply(struct net_device *dev,
|
struct vxlan_config *conf,
|
struct net_device *lowerdev,
|
struct net *src_net,
|
bool changelink)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct vxlan_rdst *dst = &vxlan->default_dst;
|
unsigned short needed_headroom = ETH_HLEN;
|
bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
|
int max_mtu = ETH_MAX_MTU;
|
|
if (!changelink) {
|
if (conf->flags & VXLAN_F_GPE)
|
vxlan_raw_setup(dev);
|
else
|
vxlan_ether_setup(dev);
|
|
if (conf->mtu)
|
dev->mtu = conf->mtu;
|
|
vxlan->net = src_net;
|
}
|
|
dst->remote_vni = conf->vni;
|
|
memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
|
|
if (lowerdev) {
|
dst->remote_ifindex = conf->remote_ifindex;
|
|
dev->gso_max_size = lowerdev->gso_max_size;
|
dev->gso_max_segs = lowerdev->gso_max_segs;
|
|
needed_headroom = lowerdev->hard_header_len;
|
needed_headroom += lowerdev->needed_headroom;
|
|
dev->needed_tailroom = lowerdev->needed_tailroom;
|
|
max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
|
VXLAN_HEADROOM);
|
if (max_mtu < ETH_MIN_MTU)
|
max_mtu = ETH_MIN_MTU;
|
|
if (!changelink && !conf->mtu)
|
dev->mtu = max_mtu;
|
}
|
|
if (dev->mtu > max_mtu)
|
dev->mtu = max_mtu;
|
|
if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
|
needed_headroom += VXLAN6_HEADROOM;
|
else
|
needed_headroom += VXLAN_HEADROOM;
|
dev->needed_headroom = needed_headroom;
|
|
memcpy(&vxlan->cfg, conf, sizeof(*conf));
|
}
|
|
static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
|
struct vxlan_config *conf, bool changelink,
|
struct netlink_ext_ack *extack)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct net_device *lowerdev;
|
int ret;
|
|
ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
|
if (ret)
|
return ret;
|
|
vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
|
|
return 0;
|
}
|
|
static int __vxlan_dev_create(struct net *net, struct net_device *dev,
|
struct vxlan_config *conf,
|
struct netlink_ext_ack *extack)
|
{
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct vxlan_fdb *f = NULL;
|
bool unregister = false;
|
int err;
|
|
err = vxlan_dev_configure(net, dev, conf, false, extack);
|
if (err)
|
return err;
|
|
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,
|
vxlan->cfg.dst_port,
|
vxlan->default_dst.remote_vni,
|
vxlan->default_dst.remote_vni,
|
vxlan->default_dst.remote_ifindex,
|
NTF_SELF, &f);
|
if (err)
|
return err;
|
}
|
|
err = register_netdevice(dev);
|
if (err)
|
goto errout;
|
unregister = true;
|
|
err = rtnl_configure_link(dev, NULL);
|
if (err)
|
goto errout;
|
|
/* notify default fdb entry */
|
if (f)
|
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
|
|
list_add(&vxlan->next, &vn->vxlan_list);
|
return 0;
|
|
errout:
|
/* unregister_netdevice() destroys the default FDB entry with deletion
|
* notification. But the addition notification was not sent yet, so
|
* destroy the entry by hand here.
|
*/
|
if (f)
|
vxlan_fdb_destroy(vxlan, f, false);
|
if (unregister)
|
unregister_netdevice(dev);
|
return err;
|
}
|
|
static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
|
struct net_device *dev, struct vxlan_config *conf,
|
bool changelink)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
memset(conf, 0, sizeof(*conf));
|
|
/* if changelink operation, start with old existing cfg */
|
if (changelink)
|
memcpy(conf, &vxlan->cfg, sizeof(*conf));
|
|
if (data[IFLA_VXLAN_ID]) {
|
__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
|
|
if (changelink && (vni != conf->vni))
|
return -EOPNOTSUPP;
|
conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
|
}
|
|
if (data[IFLA_VXLAN_GROUP]) {
|
if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
|
return -EOPNOTSUPP;
|
|
conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
|
conf->remote_ip.sa.sa_family = AF_INET;
|
} else if (data[IFLA_VXLAN_GROUP6]) {
|
if (!IS_ENABLED(CONFIG_IPV6))
|
return -EPFNOSUPPORT;
|
|
if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
|
return -EOPNOTSUPP;
|
|
conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
|
conf->remote_ip.sa.sa_family = AF_INET6;
|
}
|
|
if (data[IFLA_VXLAN_LOCAL]) {
|
if (changelink && (conf->saddr.sa.sa_family != AF_INET))
|
return -EOPNOTSUPP;
|
|
conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
|
conf->saddr.sa.sa_family = AF_INET;
|
} else if (data[IFLA_VXLAN_LOCAL6]) {
|
if (!IS_ENABLED(CONFIG_IPV6))
|
return -EPFNOSUPPORT;
|
|
if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
|
return -EOPNOTSUPP;
|
|
/* TODO: respect scope id */
|
conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
|
conf->saddr.sa.sa_family = AF_INET6;
|
}
|
|
if (data[IFLA_VXLAN_LINK])
|
conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
|
|
if (data[IFLA_VXLAN_TOS])
|
conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
|
|
if (data[IFLA_VXLAN_TTL])
|
conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
|
|
if (data[IFLA_VXLAN_TTL_INHERIT]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->flags |= VXLAN_F_TTL_INHERIT;
|
}
|
|
if (data[IFLA_VXLAN_LABEL])
|
conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
|
IPV6_FLOWLABEL_MASK;
|
|
if (data[IFLA_VXLAN_LEARNING]) {
|
if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
|
conf->flags |= VXLAN_F_LEARN;
|
else
|
conf->flags &= ~VXLAN_F_LEARN;
|
} else if (!changelink) {
|
/* default to learn on a new device */
|
conf->flags |= VXLAN_F_LEARN;
|
}
|
|
if (data[IFLA_VXLAN_AGEING]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
|
}
|
|
if (data[IFLA_VXLAN_PROXY]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
|
conf->flags |= VXLAN_F_PROXY;
|
}
|
|
if (data[IFLA_VXLAN_RSC]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_RSC]))
|
conf->flags |= VXLAN_F_RSC;
|
}
|
|
if (data[IFLA_VXLAN_L2MISS]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
|
conf->flags |= VXLAN_F_L2MISS;
|
}
|
|
if (data[IFLA_VXLAN_L3MISS]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
|
conf->flags |= VXLAN_F_L3MISS;
|
}
|
|
if (data[IFLA_VXLAN_LIMIT]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
|
}
|
|
if (data[IFLA_VXLAN_COLLECT_METADATA]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
|
conf->flags |= VXLAN_F_COLLECT_METADATA;
|
}
|
|
if (data[IFLA_VXLAN_PORT_RANGE]) {
|
if (!changelink) {
|
const struct ifla_vxlan_port_range *p
|
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
|
conf->port_min = ntohs(p->low);
|
conf->port_max = ntohs(p->high);
|
} else {
|
return -EOPNOTSUPP;
|
}
|
}
|
|
if (data[IFLA_VXLAN_PORT]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
|
}
|
|
if (data[IFLA_VXLAN_UDP_CSUM]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
|
conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
|
}
|
|
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
|
conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
|
}
|
|
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
|
conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
|
}
|
|
if (data[IFLA_VXLAN_REMCSUM_TX]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
|
conf->flags |= VXLAN_F_REMCSUM_TX;
|
}
|
|
if (data[IFLA_VXLAN_REMCSUM_RX]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
|
conf->flags |= VXLAN_F_REMCSUM_RX;
|
}
|
|
if (data[IFLA_VXLAN_GBP]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->flags |= VXLAN_F_GBP;
|
}
|
|
if (data[IFLA_VXLAN_GPE]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->flags |= VXLAN_F_GPE;
|
}
|
|
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
|
}
|
|
if (tb[IFLA_MTU]) {
|
if (changelink)
|
return -EOPNOTSUPP;
|
conf->mtu = nla_get_u32(tb[IFLA_MTU]);
|
}
|
|
return 0;
|
}
|
|
static int vxlan_newlink(struct net *src_net, struct net_device *dev,
|
struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
struct vxlan_config conf;
|
int err;
|
|
err = vxlan_nl2conf(tb, data, dev, &conf, false);
|
if (err)
|
return err;
|
|
return __vxlan_dev_create(src_net, dev, &conf, extack);
|
}
|
|
static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
|
struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
struct vxlan_rdst *dst = &vxlan->default_dst;
|
struct vxlan_rdst old_dst;
|
struct vxlan_config conf;
|
int err;
|
|
err = vxlan_nl2conf(tb, data,
|
dev, &conf, true);
|
if (err)
|
return err;
|
|
memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
|
|
err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
|
if (err)
|
return err;
|
|
/* handle default dst entry */
|
if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
|
spin_lock_bh(&vxlan->hash_lock);
|
if (!vxlan_addr_any(&old_dst.remote_ip))
|
__vxlan_fdb_delete(vxlan, all_zeros_mac,
|
old_dst.remote_ip,
|
vxlan->cfg.dst_port,
|
old_dst.remote_vni,
|
old_dst.remote_vni,
|
old_dst.remote_ifindex, 0);
|
|
if (!vxlan_addr_any(&dst->remote_ip)) {
|
err = vxlan_fdb_update(vxlan, all_zeros_mac,
|
&dst->remote_ip,
|
NUD_REACHABLE | NUD_PERMANENT,
|
NLM_F_APPEND | NLM_F_CREATE,
|
vxlan->cfg.dst_port,
|
dst->remote_vni,
|
dst->remote_vni,
|
dst->remote_ifindex,
|
NTF_SELF);
|
if (err) {
|
spin_unlock_bh(&vxlan->hash_lock);
|
return err;
|
}
|
}
|
spin_unlock_bh(&vxlan->hash_lock);
|
}
|
|
return 0;
|
}
|
|
static void vxlan_dellink(struct net_device *dev, struct list_head *head)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
vxlan_flush(vxlan, true);
|
|
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_TTL_INHERIT */
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
|
nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
|
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(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
|
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 */
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
|
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_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->cfg.port_min),
|
.high = htons(vxlan->cfg.port_max),
|
};
|
|
if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(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_in_addr(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_in6_addr(skb, IFLA_VXLAN_GROUP6,
|
&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->cfg.saddr)) {
|
if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
|
if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
|
vxlan->cfg.saddr.sin.sin_addr.s_addr))
|
goto nla_put_failure;
|
#if IS_ENABLED(CONFIG_IPV6)
|
} else {
|
if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
|
&vxlan->cfg.saddr.sin6.sin6_addr))
|
goto nla_put_failure;
|
#endif
|
}
|
}
|
|
if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
|
nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
|
!!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
|
nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
|
nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
|
nla_put_u8(skb, IFLA_VXLAN_LEARNING,
|
!!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
|
nla_put_u8(skb, IFLA_VXLAN_PROXY,
|
!!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
|
nla_put_u8(skb, IFLA_VXLAN_RSC,
|
!!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
|
nla_put_u8(skb, IFLA_VXLAN_L2MISS,
|
!!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
|
nla_put_u8(skb, IFLA_VXLAN_L3MISS,
|
!!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
|
nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
|
!!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
|
nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
|
nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
|
nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
|
nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
|
!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
|
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
|
!!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
|
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
|
!!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
|
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
|
!!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
|
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
|
!!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
|
goto nla_put_failure;
|
|
if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
|
goto nla_put_failure;
|
|
if (vxlan->cfg.flags & VXLAN_F_GBP &&
|
nla_put_flag(skb, IFLA_VXLAN_GBP))
|
goto nla_put_failure;
|
|
if (vxlan->cfg.flags & VXLAN_F_GPE &&
|
nla_put_flag(skb, IFLA_VXLAN_GPE))
|
goto nla_put_failure;
|
|
if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
|
nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
|
goto nla_put_failure;
|
|
return 0;
|
|
nla_put_failure:
|
return -EMSGSIZE;
|
}
|
|
static struct net *vxlan_get_link_net(const struct net_device *dev)
|
{
|
struct vxlan_dev *vxlan = netdev_priv(dev);
|
|
return vxlan->net;
|
}
|
|
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,
|
.changelink = vxlan_changelink,
|
.dellink = vxlan_dellink,
|
.get_size = vxlan_get_size,
|
.fill_info = vxlan_fill_info,
|
.get_link_net = vxlan_get_link_net,
|
};
|
|
struct net_device *vxlan_dev_create(struct net *net, const char *name,
|
u8 name_assign_type,
|
struct vxlan_config *conf)
|
{
|
struct nlattr *tb[IFLA_MAX + 1];
|
struct net_device *dev;
|
int err;
|
|
memset(&tb, 0, sizeof(tb));
|
|
dev = rtnl_create_link(net, name, name_assign_type,
|
&vxlan_link_ops, tb);
|
if (IS_ERR(dev))
|
return dev;
|
|
err = __vxlan_dev_create(net, dev, conf, NULL);
|
if (err < 0) {
|
free_netdev(dev);
|
return ERR_PTR(err);
|
}
|
|
err = rtnl_configure_link(dev, NULL);
|
if (err < 0) {
|
LIST_HEAD(list_kill);
|
|
vxlan_dellink(dev, &list_kill);
|
unregister_netdevice_many(&list_kill);
|
return ERR_PTR(err);
|
}
|
|
return dev;
|
}
|
EXPORT_SYMBOL_GPL(vxlan_dev_create);
|
|
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_netdevice_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_offload_rx_ports(dev, false);
|
vxlan_handle_lowerdev_unregister(vn, dev);
|
} else if (event == NETDEV_REGISTER) {
|
vxlan_offload_rx_ports(dev, true);
|
} else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
|
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
|
vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
|
}
|
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block vxlan_notifier_block __read_mostly = {
|
.notifier_call = vxlan_netdevice_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 vxlan_destroy_tunnels(struct net *net, struct list_head *head)
|
{
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
struct vxlan_dev *vxlan, *next;
|
struct net_device *dev, *aux;
|
|
for_each_netdev_safe(net, dev, aux)
|
if (dev->rtnl_link_ops == &vxlan_link_ops)
|
unregister_netdevice_queue(dev, head);
|
|
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(vxlan->dev, head);
|
}
|
|
}
|
|
static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
|
{
|
struct net *net;
|
LIST_HEAD(list);
|
unsigned int h;
|
|
rtnl_lock();
|
list_for_each_entry(net, net_list, exit_list)
|
vxlan_destroy_tunnels(net, &list);
|
|
unregister_netdevice_many(&list);
|
rtnl_unlock();
|
|
list_for_each_entry(net, net_list, exit_list) {
|
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
|
|
for (h = 0; h < PORT_HASH_SIZE; ++h)
|
WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
|
}
|
}
|
|
static struct pernet_operations vxlan_net_ops = {
|
.init = vxlan_init_net,
|
.exit_batch = vxlan_exit_batch_net,
|
.id = &vxlan_net_id,
|
.size = sizeof(struct vxlan_net),
|
};
|
|
static int __init vxlan_init_module(void)
|
{
|
int rc;
|
|
get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
|
|
rc = register_pernet_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:
|
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);
|
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");
|
