/* * VXLAN: Virtual eXtensible Local Area Network * * Copyright (c) 2012-2013 Vyatta Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/types.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/skbuff.h> #include <linux/rculist.h> #include <linux/netdevice.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/udp.h> #include <linux/igmp.h> #include <linux/etherdevice.h> #include <linux/if_ether.h> #include <linux/if_vlan.h> #include <linux/hash.h> #include <linux/ethtool.h> #include <net/arp.h> #include <net/ndisc.h> #include <net/ip.h> #include <net/ip_tunnels.h> #include <net/icmp.h> #include <net/udp.h> #include <net/rtnetlink.h> #include <net/route.h> #include <net/dsfield.h> #include <net/inet_ecn.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include <net/vxlan.h> #include <net/protocol.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> #include <net/addrconf.h> #include <net/ip6_tunnel.h> #include <net/ip6_checksum.h> #endif #define VXLAN_VERSION "0.1" #define PORT_HASH_BITS 8 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS) #define VNI_HASH_BITS 10 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) #define FDB_HASH_BITS 8 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) #define FDB_AGE_DEFAULT 300 /* 5 min */ #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ #define VXLAN_N_VID (1u << 24) #define VXLAN_VID_MASK (VXLAN_N_VID - 1) #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ /* VXLAN protocol header */ struct vxlanhdr { __be32 vx_flags; __be32 vx_vni; }; /* UDP port for VXLAN traffic. * The IANA assigned port is 4789, but the Linux default is 8472 * for compatibility with early adopters. */ static unsigned short vxlan_port __read_mostly = 8472; module_param_named(udp_port, vxlan_port, ushort, 0444); MODULE_PARM_DESC(udp_port, "Destination UDP port"); static bool log_ecn_error = true; module_param(log_ecn_error, bool, 0644); MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); static int vxlan_net_id; static const u8 all_zeros_mac[ETH_ALEN]; /* per-network namespace private data for this module */ struct vxlan_net { struct list_head vxlan_list; struct hlist_head sock_list[PORT_HASH_SIZE]; spinlock_t sock_lock; }; union vxlan_addr { struct sockaddr_in sin; struct sockaddr_in6 sin6; struct sockaddr sa; }; struct vxlan_rdst { union vxlan_addr remote_ip; __be16 remote_port; u32 remote_vni; u32 remote_ifindex; struct list_head list; struct rcu_head rcu; }; /* Forwarding table entry */ struct vxlan_fdb { struct hlist_node hlist; /* linked list of entries */ struct rcu_head rcu; unsigned long updated; /* jiffies */ unsigned long used; struct list_head remotes; u16 state; /* see ndm_state */ u8 flags; /* see ndm_flags */ u8 eth_addr[ETH_ALEN]; }; /* Pseudo network device */ struct vxlan_dev { struct hlist_node hlist; /* vni hash table */ struct list_head next; /* vxlan's per namespace list */ struct vxlan_sock *vn_sock; /* listening socket */ struct net_device *dev; struct vxlan_rdst default_dst; /* default destination */ union vxlan_addr saddr; /* source address */ __be16 dst_port; __u16 port_min; /* source port range */ __u16 port_max; __u8 tos; /* TOS override */ __u8 ttl; u32 flags; /* VXLAN_F_* below */ struct work_struct sock_work; struct work_struct igmp_join; struct work_struct igmp_leave; unsigned long age_interval; struct timer_list age_timer; spinlock_t hash_lock; unsigned int addrcnt; unsigned int addrmax; struct hlist_head fdb_head[FDB_HASH_SIZE]; }; #define VXLAN_F_LEARN 0x01 #define VXLAN_F_PROXY 0x02 #define VXLAN_F_RSC 0x04 #define VXLAN_F_L2MISS 0x08 #define VXLAN_F_L3MISS 0x10 #define VXLAN_F_IPV6 0x20 /* internal flag */ /* salt for hash table */ static u32 vxlan_salt __read_mostly; static struct workqueue_struct *vxlan_wq; static void vxlan_sock_work(struct work_struct *work); #if IS_ENABLED(CONFIG_IPV6) static inline bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) { if (a->sa.sa_family != b->sa.sa_family) return false; if (a->sa.sa_family == AF_INET6) return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr); else return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; } static inline bool vxlan_addr_any(const union vxlan_addr *ipa) { if (ipa->sa.sa_family == AF_INET6) return ipv6_addr_any(&ipa->sin6.sin6_addr); else return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); } static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) { if (ipa->sa.sa_family == AF_INET6) return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr); else return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr)); } static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) { if (nla_len(nla) >= sizeof(struct in6_addr)) { nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr)); ip->sa.sa_family = AF_INET6; return 0; } else if (nla_len(nla) >= sizeof(__be32)) { ip->sin.sin_addr.s_addr = nla_get_be32(nla); ip->sa.sa_family = AF_INET; return 0; } else { return -EAFNOSUPPORT; } } static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, const union vxlan_addr *ip) { if (ip->sa.sa_family == AF_INET6) return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr); else return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr); } #else /* !CONFIG_IPV6 */ static inline bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) { return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; } static inline bool vxlan_addr_any(const union vxlan_addr *ipa) { return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); } static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) { return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr)); } static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) { if (nla_len(nla) >= sizeof(struct in6_addr)) { return -EAFNOSUPPORT; } else if (nla_len(nla) >= sizeof(__be32)) { ip->sin.sin_addr.s_addr = nla_get_be32(nla); ip->sa.sa_family = AF_INET; return 0; } else { return -EAFNOSUPPORT; } } static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, const union vxlan_addr *ip) { return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr); } #endif /* Virtual Network hash table head */ static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id) { return &vs->vni_list[hash_32(id, VNI_HASH_BITS)]; } /* Socket hash table head */ static inline struct hlist_head *vs_head(struct net *net, __be16 port) { struct vxlan_net *vn = net_generic(net, vxlan_net_id); return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; } /* First remote destination for a forwarding entry. * Guaranteed to be non-NULL because remotes are never deleted. */ static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb) { return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); } static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) { return list_first_entry(&fdb->remotes, struct vxlan_rdst, list); } /* Find VXLAN socket based on network namespace and UDP port */ static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port) { struct vxlan_sock *vs; hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { if (inet_sk(vs->sock->sk)->inet_sport == port) return vs; } return NULL; } static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id) { struct vxlan_dev *vxlan; hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) { if (vxlan->default_dst.remote_vni == id) return vxlan; } return NULL; } /* Look up VNI in a per net namespace table */ static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port) { struct vxlan_sock *vs; vs = vxlan_find_sock(net, port); if (!vs) return NULL; return vxlan_vs_find_vni(vs, id); } /* Fill in neighbour message in skbuff. */ static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, const struct vxlan_fdb *fdb, u32 portid, u32 seq, int type, unsigned int flags, const struct vxlan_rdst *rdst) { unsigned long now = jiffies; struct nda_cacheinfo ci; struct nlmsghdr *nlh; struct ndmsg *ndm; bool send_ip, send_eth; nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); if (nlh == NULL) return -EMSGSIZE; ndm = nlmsg_data(nlh); memset(ndm, 0, sizeof(*ndm)); send_eth = send_ip = true; if (type == RTM_GETNEIGH) { ndm->ndm_family = AF_INET; send_ip = !vxlan_addr_any(&rdst->remote_ip); send_eth = !is_zero_ether_addr(fdb->eth_addr); } else ndm->ndm_family = AF_BRIDGE; ndm->ndm_state = fdb->state; ndm->ndm_ifindex = vxlan->dev->ifindex; ndm->ndm_flags = fdb->flags; ndm->ndm_type = NDA_DST; if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) goto nla_put_failure; if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip)) goto nla_put_failure; if (rdst->remote_port && rdst->remote_port != vxlan->dst_port && nla_put_be16(skb, NDA_PORT, rdst->remote_port)) goto nla_put_failure; if (rdst->remote_vni != vxlan->default_dst.remote_vni && nla_put_u32(skb, NDA_VNI, rdst->remote_vni)) goto nla_put_failure; if (rdst->remote_ifindex && nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) goto nla_put_failure; ci.ndm_used = jiffies_to_clock_t(now - fdb->used); ci.ndm_confirmed = 0; ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); ci.ndm_refcnt = 0; if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) goto nla_put_failure; return nlmsg_end(skb, nlh); nla_put_failure: nlmsg_cancel(skb, nlh); return -EMSGSIZE; } static inline size_t vxlan_nlmsg_size(void) { return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ + nla_total_size(sizeof(__be16)) /* NDA_PORT */ + nla_total_size(sizeof(__be32)) /* NDA_VNI */ + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ + nla_total_size(sizeof(struct nda_cacheinfo)); } static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, struct vxlan_rdst *rd, int type) { struct net *net = dev_net(vxlan->dev); struct sk_buff *skb; int err = -ENOBUFS; skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); if (skb == NULL) goto errout; err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); if (err < 0) { /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ WARN_ON(err == -EMSGSIZE); kfree_skb(skb); goto errout; } rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); return; errout: if (err < 0) rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); } static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_fdb f = { .state = NUD_STALE, }; struct vxlan_rdst remote = { .remote_ip = *ipa, /* goes to NDA_DST */ .remote_vni = VXLAN_N_VID, }; vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH); } static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) { struct vxlan_fdb f = { .state = NUD_STALE, }; struct vxlan_rdst remote = { }; memcpy(f.eth_addr, eth_addr, ETH_ALEN); vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH); } /* Hash Ethernet address */ static u32 eth_hash(const unsigned char *addr) { u64 value = get_unaligned((u64 *)addr); /* only want 6 bytes */ #ifdef __BIG_ENDIAN value >>= 16; #else value <<= 16; #endif return hash_64(value, FDB_HASH_BITS); } /* Hash chain to use given mac address */ static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, const u8 *mac) { return &vxlan->fdb_head[eth_hash(mac)]; } /* Look up Ethernet address in forwarding table */ static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, const u8 *mac) { struct hlist_head *head = vxlan_fdb_head(vxlan, mac); struct vxlan_fdb *f; hlist_for_each_entry_rcu(f, head, hlist) { if (ether_addr_equal(mac, f->eth_addr)) return f; } return NULL; } static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, const u8 *mac) { struct vxlan_fdb *f; f = __vxlan_find_mac(vxlan, mac); if (f) f->used = jiffies; return f; } /* caller should hold vxlan->hash_lock */ static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex) { struct vxlan_rdst *rd; list_for_each_entry(rd, &f->remotes, list) { if (vxlan_addr_equal(&rd->remote_ip, ip) && rd->remote_port == port && rd->remote_vni == vni && rd->remote_ifindex == ifindex) return rd; } return NULL; } /* Replace destination of unicast mac */ static int vxlan_fdb_replace(struct vxlan_fdb *f, union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex) { struct vxlan_rdst *rd; rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); if (rd) return 0; rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); if (!rd) return 0; rd->remote_ip = *ip; rd->remote_port = port; rd->remote_vni = vni; rd->remote_ifindex = ifindex; return 1; } /* Add/update destinations for multicast */ static int vxlan_fdb_append(struct vxlan_fdb *f, union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex, struct vxlan_rdst **rdp) { struct vxlan_rdst *rd; rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); if (rd) return 0; rd = kmalloc(sizeof(*rd), GFP_ATOMIC); if (rd == NULL) return -ENOBUFS; rd->remote_ip = *ip; rd->remote_port = port; rd->remote_vni = vni; rd->remote_ifindex = ifindex; list_add_tail_rcu(&rd->list, &f->remotes); *rdp = rd; return 1; } static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb) { struct sk_buff *p, **pp = NULL; struct vxlanhdr *vh, *vh2; struct ethhdr *eh, *eh2; unsigned int hlen, off_vx, off_eth; const struct packet_offload *ptype; __be16 type; int flush = 1; off_vx = skb_gro_offset(skb); hlen = off_vx + sizeof(*vh); vh = skb_gro_header_fast(skb, off_vx); if (skb_gro_header_hard(skb, hlen)) { vh = skb_gro_header_slow(skb, hlen, off_vx); if (unlikely(!vh)) goto out; } skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ off_eth = skb_gro_offset(skb); hlen = off_eth + sizeof(*eh); eh = skb_gro_header_fast(skb, off_eth); if (skb_gro_header_hard(skb, hlen)) { eh = skb_gro_header_slow(skb, hlen, off_eth); if (unlikely(!eh)) goto out; } flush = 0; for (p = *head; p; p = p->next) { if (!NAPI_GRO_CB(p)->same_flow) continue; vh2 = (struct vxlanhdr *)(p->data + off_vx); eh2 = (struct ethhdr *)(p->data + off_eth); if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) { NAPI_GRO_CB(p)->same_flow = 0; continue; } } type = eh->h_proto; rcu_read_lock(); ptype = gro_find_receive_by_type(type); if (ptype == NULL) { flush = 1; goto out_unlock; } skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */ pp = ptype->callbacks.gro_receive(head, skb); out_unlock: rcu_read_unlock(); out: NAPI_GRO_CB(skb)->flush |= flush; return pp; } static int vxlan_gro_complete(struct sk_buff *skb, int nhoff) { struct ethhdr *eh; struct packet_offload *ptype; __be16 type; int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr); int err = -ENOSYS; eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr)); type = eh->h_proto; rcu_read_lock(); ptype = gro_find_complete_by_type(type); if (ptype != NULL) err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len); rcu_read_unlock(); return err; } /* Notify netdevs that UDP port started listening */ static void vxlan_notify_add_rx_port(struct vxlan_sock *vs) { struct net_device *dev; struct sock *sk = vs->sock->sk; struct net *net = sock_net(sk); sa_family_t sa_family = sk->sk_family; __be16 port = inet_sk(sk)->inet_sport; int err; if (sa_family == AF_INET) { err = udp_add_offload(&vs->udp_offloads); if (err) pr_warn("vxlan: udp_add_offload failed with status %d\n", err); } rcu_read_lock(); for_each_netdev_rcu(net, dev) { if (dev->netdev_ops->ndo_add_vxlan_port) dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family, port); } rcu_read_unlock(); } /* Notify netdevs that UDP port is no more listening */ static void vxlan_notify_del_rx_port(struct vxlan_sock *vs) { struct net_device *dev; struct sock *sk = vs->sock->sk; struct net *net = sock_net(sk); sa_family_t sa_family = sk->sk_family; __be16 port = inet_sk(sk)->inet_sport; rcu_read_lock(); for_each_netdev_rcu(net, dev) { if (dev->netdev_ops->ndo_del_vxlan_port) dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family, port); } rcu_read_unlock(); if (sa_family == AF_INET) udp_del_offload(&vs->udp_offloads); } /* Add new entry to forwarding table -- assumes lock held */ static int vxlan_fdb_create(struct vxlan_dev *vxlan, const u8 *mac, union vxlan_addr *ip, __u16 state, __u16 flags, __be16 port, __u32 vni, __u32 ifindex, __u8 ndm_flags) { struct vxlan_rdst *rd = NULL; struct vxlan_fdb *f; int notify = 0; f = __vxlan_find_mac(vxlan, mac); if (f) { if (flags & NLM_F_EXCL) { netdev_dbg(vxlan->dev, "lost race to create %pM\n", mac); return -EEXIST; } if (f->state != state) { f->state = state; f->updated = jiffies; notify = 1; } if (f->flags != ndm_flags) { f->flags = ndm_flags; f->updated = jiffies; notify = 1; } if ((flags & NLM_F_REPLACE)) { /* Only change unicasts */ if (!(is_multicast_ether_addr(f->eth_addr) || is_zero_ether_addr(f->eth_addr))) { int rc = vxlan_fdb_replace(f, ip, port, vni, ifindex); if (rc < 0) return rc; notify |= rc; } else return -EOPNOTSUPP; } if ((flags & NLM_F_APPEND) && (is_multicast_ether_addr(f->eth_addr) || is_zero_ether_addr(f->eth_addr))) { int rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); if (rc < 0) return rc; notify |= rc; } } else { if (!(flags & NLM_F_CREATE)) return -ENOENT; if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) return -ENOSPC; /* Disallow replace to add a multicast entry */ if ((flags & NLM_F_REPLACE) && (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) return -EOPNOTSUPP; netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); f = kmalloc(sizeof(*f), GFP_ATOMIC); if (!f) return -ENOMEM; notify = 1; f->state = state; f->flags = ndm_flags; f->updated = f->used = jiffies; INIT_LIST_HEAD(&f->remotes); memcpy(f->eth_addr, mac, ETH_ALEN); vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); ++vxlan->addrcnt; hlist_add_head_rcu(&f->hlist, vxlan_fdb_head(vxlan, mac)); } if (notify) { if (rd == NULL) rd = first_remote_rtnl(f); vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH); } return 0; } static void vxlan_fdb_free(struct rcu_head *head) { struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); struct vxlan_rdst *rd, *nd; list_for_each_entry_safe(rd, nd, &f->remotes, list) kfree(rd); kfree(f); } static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) { netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); --vxlan->addrcnt; vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH); hlist_del_rcu(&f->hlist); call_rcu(&f->rcu, vxlan_fdb_free); } static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex) { struct net *net = dev_net(vxlan->dev); int err; if (tb[NDA_DST]) { err = vxlan_nla_get_addr(ip, tb[NDA_DST]); if (err) return err; } else { union vxlan_addr *remote = &vxlan->default_dst.remote_ip; if (remote->sa.sa_family == AF_INET) { ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); ip->sa.sa_family = AF_INET; #if IS_ENABLED(CONFIG_IPV6) } else { ip->sin6.sin6_addr = in6addr_any; ip->sa.sa_family = AF_INET6; #endif } } if (tb[NDA_PORT]) { if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) return -EINVAL; *port = nla_get_be16(tb[NDA_PORT]); } else { *port = vxlan->dst_port; } if (tb[NDA_VNI]) { if (nla_len(tb[NDA_VNI]) != sizeof(u32)) return -EINVAL; *vni = nla_get_u32(tb[NDA_VNI]); } else { *vni = vxlan->default_dst.remote_vni; } if (tb[NDA_IFINDEX]) { struct net_device *tdev; if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) return -EINVAL; *ifindex = nla_get_u32(tb[NDA_IFINDEX]); tdev = __dev_get_by_index(net, *ifindex); if (!tdev) return -EADDRNOTAVAIL; } else { *ifindex = 0; } return 0; } /* Add static entry (via netlink) */ static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], struct net_device *dev, const unsigned char *addr, u16 flags) { struct vxlan_dev *vxlan = netdev_priv(dev); /* struct net *net = dev_net(vxlan->dev); */ union vxlan_addr ip; __be16 port; u32 vni, ifindex; int err; if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { pr_info("RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); return -EINVAL; } if (tb[NDA_DST] == NULL) return -EINVAL; err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); if (err) return err; if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) return -EAFNOSUPPORT; spin_lock_bh(&vxlan->hash_lock); err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags, port, vni, ifindex, ndm->ndm_flags); spin_unlock_bh(&vxlan->hash_lock); return err; } /* Delete entry (via netlink) */ static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], struct net_device *dev, const unsigned char *addr) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_fdb *f; struct vxlan_rdst *rd = NULL; union vxlan_addr ip; __be16 port; u32 vni, ifindex; int err; err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); if (err) return err; err = -ENOENT; spin_lock_bh(&vxlan->hash_lock); f = vxlan_find_mac(vxlan, addr); if (!f) goto out; if (!vxlan_addr_any(&ip)) { rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); if (!rd) goto out; } err = 0; /* remove a destination if it's not the only one on the list, * otherwise destroy the fdb entry */ if (rd && !list_is_singular(&f->remotes)) { list_del_rcu(&rd->list); vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH); kfree_rcu(rd, rcu); goto out; } vxlan_fdb_destroy(vxlan, f); out: spin_unlock_bh(&vxlan->hash_lock); return err; } /* Dump forwarding table */ static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, struct net_device *dev, int idx) { struct vxlan_dev *vxlan = netdev_priv(dev); unsigned int h; for (h = 0; h < FDB_HASH_SIZE; ++h) { struct vxlan_fdb *f; int err; hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { struct vxlan_rdst *rd; if (idx < cb->args[0]) goto skip; list_for_each_entry_rcu(rd, &f->remotes, list) { err = vxlan_fdb_info(skb, vxlan, f, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_NEWNEIGH, NLM_F_MULTI, rd); if (err < 0) goto out; } skip: ++idx; } } out: return idx; } /* Watch incoming packets to learn mapping between Ethernet address * and Tunnel endpoint. * Return true if packet is bogus and should be droppped. */ static bool vxlan_snoop(struct net_device *dev, union vxlan_addr *src_ip, const u8 *src_mac) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_fdb *f; f = vxlan_find_mac(vxlan, src_mac); if (likely(f)) { struct vxlan_rdst *rdst = first_remote_rcu(f); if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip))) return false; /* Don't migrate static entries, drop packets */ if (f->state & NUD_NOARP) return true; if (net_ratelimit()) netdev_info(dev, "%pM migrated from %pIS to %pIS\n", src_mac, &rdst->remote_ip, &src_ip); rdst->remote_ip = *src_ip; f->updated = jiffies; vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH); } else { /* learned new entry */ spin_lock(&vxlan->hash_lock); /* close off race between vxlan_flush and incoming packets */ if (netif_running(dev)) vxlan_fdb_create(vxlan, src_mac, src_ip, NUD_REACHABLE, NLM_F_EXCL|NLM_F_CREATE, vxlan->dst_port, vxlan->default_dst.remote_vni, 0, NTF_SELF); spin_unlock(&vxlan->hash_lock); } return false; } /* See if multicast group is already in use by other ID */ static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev) { struct vxlan_dev *vxlan; /* The vxlan_sock is only used by dev, leaving group has * no effect on other vxlan devices. */ if (atomic_read(&dev->vn_sock->refcnt) == 1) return false; list_for_each_entry(vxlan, &vn->vxlan_list, next) { if (!netif_running(vxlan->dev) || vxlan == dev) continue; if (vxlan->vn_sock != dev->vn_sock) continue; if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip, &dev->default_dst.remote_ip)) continue; if (vxlan->default_dst.remote_ifindex != dev->default_dst.remote_ifindex) continue; return true; } return false; } static void vxlan_sock_hold(struct vxlan_sock *vs) { atomic_inc(&vs->refcnt); } void vxlan_sock_release(struct vxlan_sock *vs) { struct sock *sk = vs->sock->sk; struct net *net = sock_net(sk); struct vxlan_net *vn = net_generic(net, vxlan_net_id); if (!atomic_dec_and_test(&vs->refcnt)) return; spin_lock(&vn->sock_lock); hlist_del_rcu(&vs->hlist); rcu_assign_sk_user_data(vs->sock->sk, NULL); vxlan_notify_del_rx_port(vs); spin_unlock(&vn->sock_lock); queue_work(vxlan_wq, &vs->del_work); } EXPORT_SYMBOL_GPL(vxlan_sock_release); /* Callback to update multicast group membership when first VNI on * multicast asddress is brought up * Done as workqueue because ip_mc_join_group acquires RTNL. */ static void vxlan_igmp_join(struct work_struct *work) { struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join); struct vxlan_sock *vs = vxlan->vn_sock; struct sock *sk = vs->sock->sk; union vxlan_addr *ip = &vxlan->default_dst.remote_ip; int ifindex = vxlan->default_dst.remote_ifindex; lock_sock(sk); if (ip->sa.sa_family == AF_INET) { struct ip_mreqn mreq = { .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, .imr_ifindex = ifindex, }; ip_mc_join_group(sk, &mreq); #if IS_ENABLED(CONFIG_IPV6) } else { ipv6_stub->ipv6_sock_mc_join(sk, ifindex, &ip->sin6.sin6_addr); #endif } release_sock(sk); vxlan_sock_release(vs); dev_put(vxlan->dev); } /* Inverse of vxlan_igmp_join when last VNI is brought down */ static void vxlan_igmp_leave(struct work_struct *work) { struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave); struct vxlan_sock *vs = vxlan->vn_sock; struct sock *sk = vs->sock->sk; union vxlan_addr *ip = &vxlan->default_dst.remote_ip; int ifindex = vxlan->default_dst.remote_ifindex; lock_sock(sk); if (ip->sa.sa_family == AF_INET) { struct ip_mreqn mreq = { .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, .imr_ifindex = ifindex, }; ip_mc_leave_group(sk, &mreq); #if IS_ENABLED(CONFIG_IPV6) } else { ipv6_stub->ipv6_sock_mc_drop(sk, ifindex, &ip->sin6.sin6_addr); #endif } release_sock(sk); vxlan_sock_release(vs); dev_put(vxlan->dev); } /* Callback from net/ipv4/udp.c to receive packets */ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) { struct vxlan_sock *vs; struct vxlanhdr *vxh; /* Need Vxlan and inner Ethernet header to be present */ if (!pskb_may_pull(skb, VXLAN_HLEN)) goto error; /* Return packets with reserved bits set */ vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1); if (vxh->vx_flags != htonl(VXLAN_FLAGS) || (vxh->vx_vni & htonl(0xff))) { netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); goto error; } if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB))) goto drop; vs = rcu_dereference_sk_user_data(sk); if (!vs) goto drop; /* If the NIC driver gave us an encapsulated packet * with the encapsulation mark, the device checksummed it * for us. Otherwise force the upper layers to verify it. */ if ((skb->ip_summed != CHECKSUM_UNNECESSARY && skb->ip_summed != CHECKSUM_PARTIAL) || !skb->encapsulation) skb->ip_summed = CHECKSUM_NONE; skb->encapsulation = 0; vs->rcv(vs, skb, vxh->vx_vni); return 0; drop: /* Consume bad packet */ kfree_skb(skb); return 0; error: /* Return non vxlan pkt */ return 1; } static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) { struct iphdr *oip = NULL; struct ipv6hdr *oip6 = NULL; struct vxlan_dev *vxlan; struct pcpu_sw_netstats *stats; union vxlan_addr saddr; __u32 vni; int err = 0; union vxlan_addr *remote_ip; vni = ntohl(vx_vni) >> 8; /* Is this VNI defined? */ vxlan = vxlan_vs_find_vni(vs, vni); if (!vxlan) goto drop; remote_ip = &vxlan->default_dst.remote_ip; skb_reset_mac_header(skb); skb->protocol = eth_type_trans(skb, vxlan->dev); /* Ignore packet loops (and multicast echo) */ if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) goto drop; /* Re-examine inner Ethernet packet */ if (remote_ip->sa.sa_family == AF_INET) { oip = ip_hdr(skb); saddr.sin.sin_addr.s_addr = oip->saddr; saddr.sa.sa_family = AF_INET; #if IS_ENABLED(CONFIG_IPV6) } else { oip6 = ipv6_hdr(skb); saddr.sin6.sin6_addr = oip6->saddr; saddr.sa.sa_family = AF_INET6; #endif } if ((vxlan->flags & VXLAN_F_LEARN) && vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source)) goto drop; skb_reset_network_header(skb); if (oip6) err = IP6_ECN_decapsulate(oip6, skb); if (oip) err = IP_ECN_decapsulate(oip, skb); if (unlikely(err)) { if (log_ecn_error) { if (oip6) net_info_ratelimited("non-ECT from %pI6\n", &oip6->saddr); if (oip) net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", &oip->saddr, oip->tos); } if (err > 1) { ++vxlan->dev->stats.rx_frame_errors; ++vxlan->dev->stats.rx_errors; goto drop; } } stats = this_cpu_ptr(vxlan->dev->tstats); u64_stats_update_begin(&stats->syncp); stats->rx_packets++; stats->rx_bytes += skb->len; u64_stats_update_end(&stats->syncp); netif_rx(skb); return; drop: /* Consume bad packet */ kfree_skb(skb); } static int arp_reduce(struct net_device *dev, struct sk_buff *skb) { struct vxlan_dev *vxlan = netdev_priv(dev); struct arphdr *parp; u8 *arpptr, *sha; __be32 sip, tip; struct neighbour *n; if (dev->flags & IFF_NOARP) goto out; if (!pskb_may_pull(skb, arp_hdr_len(dev))) { dev->stats.tx_dropped++; goto out; } parp = arp_hdr(skb); if ((parp->ar_hrd != htons(ARPHRD_ETHER) && parp->ar_hrd != htons(ARPHRD_IEEE802)) || parp->ar_pro != htons(ETH_P_IP) || parp->ar_op != htons(ARPOP_REQUEST) || parp->ar_hln != dev->addr_len || parp->ar_pln != 4) goto out; arpptr = (u8 *)parp + sizeof(struct arphdr); sha = arpptr; arpptr += dev->addr_len; /* sha */ memcpy(&sip, arpptr, sizeof(sip)); arpptr += sizeof(sip); arpptr += dev->addr_len; /* tha */ memcpy(&tip, arpptr, sizeof(tip)); if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) goto out; n = neigh_lookup(&arp_tbl, &tip, dev); if (n) { struct vxlan_fdb *f; struct sk_buff *reply; if (!(n->nud_state & NUD_CONNECTED)) { neigh_release(n); goto out; } f = vxlan_find_mac(vxlan, n->ha); if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { /* bridge-local neighbor */ neigh_release(n); goto out; } reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, n->ha, sha); neigh_release(n); if (reply == NULL) goto out; skb_reset_mac_header(reply); __skb_pull(reply, skb_network_offset(reply)); reply->ip_summed = CHECKSUM_UNNECESSARY; reply->pkt_type = PACKET_HOST; if (netif_rx_ni(reply) == NET_RX_DROP) dev->stats.rx_dropped++; } else if (vxlan->flags & VXLAN_F_L3MISS) { union vxlan_addr ipa = { .sin.sin_addr.s_addr = tip, .sa.sa_family = AF_INET, }; vxlan_ip_miss(dev, &ipa); } out: consume_skb(skb); return NETDEV_TX_OK; } #if IS_ENABLED(CONFIG_IPV6) static struct sk_buff *vxlan_na_create(struct sk_buff *request, struct neighbour *n, bool isrouter) { struct net_device *dev = request->dev; struct sk_buff *reply; struct nd_msg *ns, *na; struct ipv6hdr *pip6; u8 *daddr; int na_olen = 8; /* opt hdr + ETH_ALEN for target */ int ns_olen; int i, len; if (dev == NULL) return NULL; len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + sizeof(*na) + na_olen + dev->needed_tailroom; reply = alloc_skb(len, GFP_ATOMIC); if (reply == NULL) return NULL; reply->protocol = htons(ETH_P_IPV6); reply->dev = dev; skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); skb_push(reply, sizeof(struct ethhdr)); skb_set_mac_header(reply, 0); ns = (struct nd_msg *)skb_transport_header(request); daddr = eth_hdr(request)->h_source; ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns); for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { daddr = ns->opt + i + sizeof(struct nd_opt_hdr); break; } } /* Ethernet header */ ether_addr_copy(eth_hdr(reply)->h_dest, daddr); ether_addr_copy(eth_hdr(reply)->h_source, n->ha); eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); reply->protocol = htons(ETH_P_IPV6); skb_pull(reply, sizeof(struct ethhdr)); skb_set_network_header(reply, 0); skb_put(reply, sizeof(struct ipv6hdr)); /* IPv6 header */ pip6 = ipv6_hdr(reply); memset(pip6, 0, sizeof(struct ipv6hdr)); pip6->version = 6; pip6->priority = ipv6_hdr(request)->priority; pip6->nexthdr = IPPROTO_ICMPV6; pip6->hop_limit = 255; pip6->daddr = ipv6_hdr(request)->saddr; pip6->saddr = *(struct in6_addr *)n->primary_key; skb_pull(reply, sizeof(struct ipv6hdr)); skb_set_transport_header(reply, 0); na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen); /* Neighbor Advertisement */ memset(na, 0, sizeof(*na)+na_olen); na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; na->icmph.icmp6_router = isrouter; na->icmph.icmp6_override = 1; na->icmph.icmp6_solicited = 1; na->target = ns->target; ether_addr_copy(&na->opt[2], n->ha); na->opt[0] = ND_OPT_TARGET_LL_ADDR; na->opt[1] = na_olen >> 3; na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, csum_partial(na, sizeof(*na)+na_olen, 0)); pip6->payload_len = htons(sizeof(*na)+na_olen); skb_push(reply, sizeof(struct ipv6hdr)); reply->ip_summed = CHECKSUM_UNNECESSARY; return reply; } static int neigh_reduce(struct net_device *dev, struct sk_buff *skb) { struct vxlan_dev *vxlan = netdev_priv(dev); struct nd_msg *msg; const struct ipv6hdr *iphdr; const struct in6_addr *saddr, *daddr; struct neighbour *n; struct inet6_dev *in6_dev; in6_dev = __in6_dev_get(dev); if (!in6_dev) goto out; if (!pskb_may_pull(skb, skb->len)) goto out; iphdr = ipv6_hdr(skb); saddr = &iphdr->saddr; daddr = &iphdr->daddr; msg = (struct nd_msg *)skb_transport_header(skb); if (msg->icmph.icmp6_code != 0 || msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION) goto out; if (ipv6_addr_loopback(daddr) || ipv6_addr_is_multicast(&msg->target)) goto out; n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); if (n) { struct vxlan_fdb *f; struct sk_buff *reply; if (!(n->nud_state & NUD_CONNECTED)) { neigh_release(n); goto out; } f = vxlan_find_mac(vxlan, n->ha); if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { /* bridge-local neighbor */ neigh_release(n); goto out; } reply = vxlan_na_create(skb, n, !!(f ? f->flags & NTF_ROUTER : 0)); neigh_release(n); if (reply == NULL) goto out; if (netif_rx_ni(reply) == NET_RX_DROP) dev->stats.rx_dropped++; } else if (vxlan->flags & VXLAN_F_L3MISS) { union vxlan_addr ipa = { .sin6.sin6_addr = msg->target, .sa.sa_family = AF_INET6, }; vxlan_ip_miss(dev, &ipa); } out: consume_skb(skb); return NETDEV_TX_OK; } #endif static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) { struct vxlan_dev *vxlan = netdev_priv(dev); struct neighbour *n; if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) return false; n = NULL; switch (ntohs(eth_hdr(skb)->h_proto)) { case ETH_P_IP: { struct iphdr *pip; if (!pskb_may_pull(skb, sizeof(struct iphdr))) return false; pip = ip_hdr(skb); n = neigh_lookup(&arp_tbl, &pip->daddr, dev); if (!n && (vxlan->flags & VXLAN_F_L3MISS)) { union vxlan_addr ipa = { .sin.sin_addr.s_addr = pip->daddr, .sa.sa_family = AF_INET, }; vxlan_ip_miss(dev, &ipa); return false; } break; } #if IS_ENABLED(CONFIG_IPV6) case ETH_P_IPV6: { struct ipv6hdr *pip6; if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) return false; pip6 = ipv6_hdr(skb); n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); if (!n && (vxlan->flags & VXLAN_F_L3MISS)) { union vxlan_addr ipa = { .sin6.sin6_addr = pip6->daddr, .sa.sa_family = AF_INET6, }; vxlan_ip_miss(dev, &ipa); return false; } break; } #endif default: return false; } if (n) { bool diff; diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); if (diff) { memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, dev->addr_len); memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); } neigh_release(n); return diff; } return false; } /* Compute source port for outgoing packet * first choice to use L4 flow hash since it will spread * better and maybe available from hardware * secondary choice is to use jhash on the Ethernet header */ __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb) { unsigned int range = (port_max - port_min) + 1; u32 hash; hash = skb_get_hash(skb); if (!hash) hash = jhash(skb->data, 2 * ETH_ALEN, (__force u32) skb->protocol); return htons((((u64) hash * range) >> 32) + port_min); } EXPORT_SYMBOL_GPL(vxlan_src_port); static int handle_offloads(struct sk_buff *skb) { if (skb_is_gso(skb)) { int err = skb_unclone(skb, GFP_ATOMIC); if (unlikely(err)) return err; skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; } else if (skb->ip_summed != CHECKSUM_PARTIAL) skb->ip_summed = CHECKSUM_NONE; return 0; } #if IS_ENABLED(CONFIG_IPV6) static int vxlan6_xmit_skb(struct vxlan_sock *vs, struct dst_entry *dst, struct sk_buff *skb, struct net_device *dev, struct in6_addr *saddr, struct in6_addr *daddr, __u8 prio, __u8 ttl, __be16 src_port, __be16 dst_port, __be32 vni) { struct ipv6hdr *ip6h; struct vxlanhdr *vxh; struct udphdr *uh; int min_headroom; int err; if (!skb->encapsulation) { skb_reset_inner_headers(skb); skb->encapsulation = 1; } skb_scrub_packet(skb, false); min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + VXLAN_HLEN + sizeof(struct ipv6hdr) + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0); /* Need space for new headers (invalidates iph ptr) */ err = skb_cow_head(skb, min_headroom); if (unlikely(err)) return err; if (vlan_tx_tag_present(skb)) { if (WARN_ON(!__vlan_put_tag(skb, skb->vlan_proto, vlan_tx_tag_get(skb)))) return -ENOMEM; skb->vlan_tci = 0; } vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); vxh->vx_flags = htonl(VXLAN_FLAGS); vxh->vx_vni = vni; __skb_push(skb, sizeof(*uh)); skb_reset_transport_header(skb); uh = udp_hdr(skb); uh->dest = dst_port; uh->source = src_port; uh->len = htons(skb->len); uh->check = 0; memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED); skb_dst_set(skb, dst); if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) { __wsum csum = skb_checksum(skb, 0, skb->len, 0); skb->ip_summed = CHECKSUM_UNNECESSARY; uh->check = csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_UDP, csum); if (uh->check == 0) uh->check = CSUM_MANGLED_0; } else { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct udphdr, check); uh->check = ~csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_UDP, 0); } __skb_push(skb, sizeof(*ip6h)); skb_reset_network_header(skb); ip6h = ipv6_hdr(skb); ip6h->version = 6; ip6h->priority = prio; ip6h->flow_lbl[0] = 0; ip6h->flow_lbl[1] = 0; ip6h->flow_lbl[2] = 0; ip6h->payload_len = htons(skb->len); ip6h->nexthdr = IPPROTO_UDP; ip6h->hop_limit = ttl; ip6h->daddr = *daddr; ip6h->saddr = *saddr; err = handle_offloads(skb); if (err) return err; ip6tunnel_xmit(skb, dev); return 0; } #endif int vxlan_xmit_skb(struct vxlan_sock *vs, struct rtable *rt, struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port, __be32 vni) { struct vxlanhdr *vxh; struct udphdr *uh; int min_headroom; int err; if (!skb->encapsulation) { skb_reset_inner_headers(skb); skb->encapsulation = 1; } min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + VXLAN_HLEN + sizeof(struct iphdr) + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0); /* Need space for new headers (invalidates iph ptr) */ err = skb_cow_head(skb, min_headroom); if (unlikely(err)) return err; if (vlan_tx_tag_present(skb)) { if (WARN_ON(!__vlan_put_tag(skb, skb->vlan_proto, vlan_tx_tag_get(skb)))) return -ENOMEM; skb->vlan_tci = 0; } vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); vxh->vx_flags = htonl(VXLAN_FLAGS); vxh->vx_vni = vni; __skb_push(skb, sizeof(*uh)); skb_reset_transport_header(skb); uh = udp_hdr(skb); uh->dest = dst_port; uh->source = src_port; uh->len = htons(skb->len); uh->check = 0; err = handle_offloads(skb); if (err) return err; return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, false); } EXPORT_SYMBOL_GPL(vxlan_xmit_skb); /* Bypass encapsulation if the destination is local */ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, struct vxlan_dev *dst_vxlan) { struct pcpu_sw_netstats *tx_stats, *rx_stats; union vxlan_addr loopback; union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); skb->pkt_type = PACKET_HOST; skb->encapsulation = 0; skb->dev = dst_vxlan->dev; __skb_pull(skb, skb_network_offset(skb)); if (remote_ip->sa.sa_family == AF_INET) { loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); loopback.sa.sa_family = AF_INET; #if IS_ENABLED(CONFIG_IPV6) } else { loopback.sin6.sin6_addr = in6addr_loopback; loopback.sa.sa_family = AF_INET6; #endif } if (dst_vxlan->flags & VXLAN_F_LEARN) vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source); u64_stats_update_begin(&tx_stats->syncp); tx_stats->tx_packets++; tx_stats->tx_bytes += skb->len; u64_stats_update_end(&tx_stats->syncp); if (netif_rx(skb) == NET_RX_SUCCESS) { u64_stats_update_begin(&rx_stats->syncp); rx_stats->rx_packets++; rx_stats->rx_bytes += skb->len; u64_stats_update_end(&rx_stats->syncp); } else { skb->dev->stats.rx_dropped++; } } static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, struct vxlan_rdst *rdst, bool did_rsc) { struct vxlan_dev *vxlan = netdev_priv(dev); struct rtable *rt = NULL; const struct iphdr *old_iph; struct flowi4 fl4; union vxlan_addr *dst; __be16 src_port = 0, dst_port; u32 vni; __be16 df = 0; __u8 tos, ttl; int err; dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; vni = rdst->remote_vni; dst = &rdst->remote_ip; if (vxlan_addr_any(dst)) { if (did_rsc) { /* short-circuited back to local bridge */ vxlan_encap_bypass(skb, vxlan, vxlan); return; } goto drop; } old_iph = ip_hdr(skb); ttl = vxlan->ttl; if (!ttl && vxlan_addr_multicast(dst)) ttl = 1; tos = vxlan->tos; if (tos == 1) tos = ip_tunnel_get_dsfield(old_iph, skb); src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb); if (dst->sa.sa_family == AF_INET) { memset(&fl4, 0, sizeof(fl4)); fl4.flowi4_oif = rdst->remote_ifindex; fl4.flowi4_tos = RT_TOS(tos); fl4.daddr = dst->sin.sin_addr.s_addr; fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr; rt = ip_route_output_key(dev_net(dev), &fl4); if (IS_ERR(rt)) { netdev_dbg(dev, "no route to %pI4\n", &dst->sin.sin_addr.s_addr); dev->stats.tx_carrier_errors++; goto tx_error; } if (rt->dst.dev == dev) { netdev_dbg(dev, "circular route to %pI4\n", &dst->sin.sin_addr.s_addr); dev->stats.collisions++; goto rt_tx_error; } /* Bypass encapsulation if the destination is local */ if (rt->rt_flags & RTCF_LOCAL && !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { struct vxlan_dev *dst_vxlan; ip_rt_put(rt); dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port); if (!dst_vxlan) goto tx_error; vxlan_encap_bypass(skb, vxlan, dst_vxlan); return; } tos = ip_tunnel_ecn_encap(tos, old_iph, skb); ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb, fl4.saddr, dst->sin.sin_addr.s_addr, tos, ttl, df, src_port, dst_port, htonl(vni << 8)); if (err < 0) goto rt_tx_error; iptunnel_xmit_stats(err, &dev->stats, dev->tstats); #if IS_ENABLED(CONFIG_IPV6) } else { struct sock *sk = vxlan->vn_sock->sock->sk; struct dst_entry *ndst; struct flowi6 fl6; u32 flags; memset(&fl6, 0, sizeof(fl6)); fl6.flowi6_oif = rdst->remote_ifindex; fl6.daddr = dst->sin6.sin6_addr; fl6.saddr = vxlan->saddr.sin6.sin6_addr; fl6.flowi6_proto = IPPROTO_UDP; if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) { netdev_dbg(dev, "no route to %pI6\n", &dst->sin6.sin6_addr); dev->stats.tx_carrier_errors++; goto tx_error; } if (ndst->dev == dev) { netdev_dbg(dev, "circular route to %pI6\n", &dst->sin6.sin6_addr); dst_release(ndst); dev->stats.collisions++; goto tx_error; } /* Bypass encapsulation if the destination is local */ flags = ((struct rt6_info *)ndst)->rt6i_flags; if (flags & RTF_LOCAL && !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { struct vxlan_dev *dst_vxlan; dst_release(ndst); dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port); if (!dst_vxlan) goto tx_error; vxlan_encap_bypass(skb, vxlan, dst_vxlan); return; } ttl = ttl ? : ip6_dst_hoplimit(ndst); err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb, dev, &fl6.saddr, &fl6.daddr, 0, ttl, src_port, dst_port, htonl(vni << 8)); #endif } return; drop: dev->stats.tx_dropped++; goto tx_free; rt_tx_error: ip_rt_put(rt); tx_error: dev->stats.tx_errors++; tx_free: dev_kfree_skb(skb); } /* Transmit local packets over Vxlan * * Outer IP header inherits ECN and DF from inner header. * Outer UDP destination is the VXLAN assigned port. * source port is based on hash of flow */ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); struct ethhdr *eth; bool did_rsc = false; struct vxlan_rdst *rdst, *fdst = NULL; struct vxlan_fdb *f; skb_reset_mac_header(skb); eth = eth_hdr(skb); if ((vxlan->flags & VXLAN_F_PROXY)) { if (ntohs(eth->h_proto) == ETH_P_ARP) return arp_reduce(dev, skb); #if IS_ENABLED(CONFIG_IPV6) else if (ntohs(eth->h_proto) == ETH_P_IPV6 && skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) && ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { struct nd_msg *msg; msg = (struct nd_msg *)skb_transport_header(skb); if (msg->icmph.icmp6_code == 0 && msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) return neigh_reduce(dev, skb); } #endif } f = vxlan_find_mac(vxlan, eth->h_dest); did_rsc = false; if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && (ntohs(eth->h_proto) == ETH_P_IP || ntohs(eth->h_proto) == ETH_P_IPV6)) { did_rsc = route_shortcircuit(dev, skb); if (did_rsc) f = vxlan_find_mac(vxlan, eth->h_dest); } if (f == NULL) { f = vxlan_find_mac(vxlan, all_zeros_mac); if (f == NULL) { if ((vxlan->flags & VXLAN_F_L2MISS) && !is_multicast_ether_addr(eth->h_dest)) vxlan_fdb_miss(vxlan, eth->h_dest); dev->stats.tx_dropped++; kfree_skb(skb); return NETDEV_TX_OK; } } list_for_each_entry_rcu(rdst, &f->remotes, list) { struct sk_buff *skb1; if (!fdst) { fdst = rdst; continue; } skb1 = skb_clone(skb, GFP_ATOMIC); if (skb1) vxlan_xmit_one(skb1, dev, rdst, did_rsc); } if (fdst) vxlan_xmit_one(skb, dev, fdst, did_rsc); else kfree_skb(skb); return NETDEV_TX_OK; } /* Walk the forwarding table and purge stale entries */ static void vxlan_cleanup(unsigned long arg) { struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; unsigned int h; if (!netif_running(vxlan->dev)) return; spin_lock_bh(&vxlan->hash_lock); for (h = 0; h < FDB_HASH_SIZE; ++h) { struct hlist_node *p, *n; hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { struct vxlan_fdb *f = container_of(p, struct vxlan_fdb, hlist); unsigned long timeout; if (f->state & NUD_PERMANENT) continue; timeout = f->used + vxlan->age_interval * HZ; if (time_before_eq(timeout, jiffies)) { netdev_dbg(vxlan->dev, "garbage collect %pM\n", f->eth_addr); f->state = NUD_STALE; vxlan_fdb_destroy(vxlan, f); } else if (time_before(timeout, next_timer)) next_timer = timeout; } } spin_unlock_bh(&vxlan->hash_lock); mod_timer(&vxlan->age_timer, next_timer); } static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan) { __u32 vni = vxlan->default_dst.remote_vni; vxlan->vn_sock = vs; hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); } /* Setup stats when device is created */ static int vxlan_init(struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); struct vxlan_sock *vs; dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); if (!dev->tstats) return -ENOMEM; spin_lock(&vn->sock_lock); vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port); if (vs) { /* If we have a socket with same port already, reuse it */ atomic_inc(&vs->refcnt); vxlan_vs_add_dev(vs, vxlan); } else { /* otherwise make new socket outside of RTNL */ dev_hold(dev); queue_work(vxlan_wq, &vxlan->sock_work); } spin_unlock(&vn->sock_lock); return 0; } static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan) { struct vxlan_fdb *f; spin_lock_bh(&vxlan->hash_lock); f = __vxlan_find_mac(vxlan, all_zeros_mac); if (f) vxlan_fdb_destroy(vxlan, f); spin_unlock_bh(&vxlan->hash_lock); } static void vxlan_uninit(struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_sock *vs = vxlan->vn_sock; vxlan_fdb_delete_default(vxlan); if (vs) vxlan_sock_release(vs); free_percpu(dev->tstats); } /* Start ageing timer and join group when device is brought up */ static int vxlan_open(struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_sock *vs = vxlan->vn_sock; /* socket hasn't been created */ if (!vs) return -ENOTCONN; if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) { vxlan_sock_hold(vs); dev_hold(dev); queue_work(vxlan_wq, &vxlan->igmp_join); } if (vxlan->age_interval) mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); return 0; } /* Purge the forwarding table */ static void vxlan_flush(struct vxlan_dev *vxlan) { unsigned int h; spin_lock_bh(&vxlan->hash_lock); for (h = 0; h < FDB_HASH_SIZE; ++h) { struct hlist_node *p, *n; hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { struct vxlan_fdb *f = container_of(p, struct vxlan_fdb, hlist); /* the all_zeros_mac entry is deleted at vxlan_uninit */ if (!is_zero_ether_addr(f->eth_addr)) vxlan_fdb_destroy(vxlan, f); } } spin_unlock_bh(&vxlan->hash_lock); } /* Cleanup timer and forwarding table on shutdown */ static int vxlan_stop(struct net_device *dev) { struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_sock *vs = vxlan->vn_sock; if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) && !vxlan_group_used(vn, vxlan)) { vxlan_sock_hold(vs); dev_hold(dev); queue_work(vxlan_wq, &vxlan->igmp_leave); } del_timer_sync(&vxlan->age_timer); vxlan_flush(vxlan); return 0; } /* Stub, nothing needs to be done. */ static void vxlan_set_multicast_list(struct net_device *dev) { } static int vxlan_change_mtu(struct net_device *dev, int new_mtu) { struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_rdst *dst = &vxlan->default_dst; struct net_device *lowerdev; int max_mtu; lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex); if (lowerdev == NULL) return eth_change_mtu(dev, new_mtu); if (dst->remote_ip.sa.sa_family == AF_INET6) max_mtu = lowerdev->mtu - VXLAN6_HEADROOM; else max_mtu = lowerdev->mtu - VXLAN_HEADROOM; if (new_mtu < 68 || new_mtu > max_mtu) return -EINVAL; dev->mtu = new_mtu; return 0; } static const struct net_device_ops vxlan_netdev_ops = { .ndo_init = vxlan_init, .ndo_uninit = vxlan_uninit, .ndo_open = vxlan_open, .ndo_stop = vxlan_stop, .ndo_start_xmit = vxlan_xmit, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_set_rx_mode = vxlan_set_multicast_list, .ndo_change_mtu = vxlan_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = eth_mac_addr, .ndo_fdb_add = vxlan_fdb_add, .ndo_fdb_del = vxlan_fdb_delete, .ndo_fdb_dump = vxlan_fdb_dump, }; /* Info for udev, that this is a virtual tunnel endpoint */ static struct device_type vxlan_type = { .name = "vxlan", }; /* Calls the ndo_add_vxlan_port of the caller in order to * supply the listening VXLAN udp ports. Callers are expected * to implement the ndo_add_vxlan_port. */ void vxlan_get_rx_port(struct net_device *dev) { struct vxlan_sock *vs; struct net *net = dev_net(dev); struct vxlan_net *vn = net_generic(net, vxlan_net_id); sa_family_t sa_family; __be16 port; unsigned int i; spin_lock(&vn->sock_lock); for (i = 0; i < PORT_HASH_SIZE; ++i) { hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { port = inet_sk(vs->sock->sk)->inet_sport; sa_family = vs->sock->sk->sk_family; dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family, port); } } spin_unlock(&vn->sock_lock); } EXPORT_SYMBOL_GPL(vxlan_get_rx_port); /* Initialize the device structure. */ static void vxlan_setup(struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); unsigned int h; int low, high; eth_hw_addr_random(dev); ether_setup(dev); if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6) dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM; else dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; dev->netdev_ops = &vxlan_netdev_ops; dev->destructor = free_netdev; SET_NETDEV_DEVTYPE(dev, &vxlan_type); dev->tx_queue_len = 0; dev->features |= NETIF_F_LLTX; dev->features |= NETIF_F_NETNS_LOCAL; dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; dev->features |= NETIF_F_RXCSUM; dev->features |= NETIF_F_GSO_SOFTWARE; dev->vlan_features = dev->features; dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; dev->hw_features |= NETIF_F_GSO_SOFTWARE; dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; INIT_LIST_HEAD(&vxlan->next); spin_lock_init(&vxlan->hash_lock); INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join); INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave); INIT_WORK(&vxlan->sock_work, vxlan_sock_work); init_timer_deferrable(&vxlan->age_timer); vxlan->age_timer.function = vxlan_cleanup; vxlan->age_timer.data = (unsigned long) vxlan; inet_get_local_port_range(dev_net(dev), &low, &high); vxlan->port_min = low; vxlan->port_max = high; vxlan->dst_port = htons(vxlan_port); vxlan->dev = dev; for (h = 0; h < FDB_HASH_SIZE; ++h) INIT_HLIST_HEAD(&vxlan->fdb_head[h]); } static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { [IFLA_VXLAN_ID] = { .type = NLA_U32 }, [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, }; static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) { if (tb[IFLA_ADDRESS]) { if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { pr_debug("invalid link address (not ethernet)\n"); return -EINVAL; } if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { pr_debug("invalid all zero ethernet address\n"); return -EADDRNOTAVAIL; } } if (!data) return -EINVAL; if (data[IFLA_VXLAN_ID]) { __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); if (id >= VXLAN_VID_MASK) return -ERANGE; } if (data[IFLA_VXLAN_PORT_RANGE]) { const struct ifla_vxlan_port_range *p = nla_data(data[IFLA_VXLAN_PORT_RANGE]); if (ntohs(p->high) < ntohs(p->low)) { pr_debug("port range %u .. %u not valid\n", ntohs(p->low), ntohs(p->high)); return -EINVAL; } } return 0; } static void vxlan_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo) { strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); } static const struct ethtool_ops vxlan_ethtool_ops = { .get_drvinfo = vxlan_get_drvinfo, .get_link = ethtool_op_get_link, }; static void vxlan_del_work(struct work_struct *work) { struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work); sk_release_kernel(vs->sock->sk); kfree_rcu(vs, rcu); } #if IS_ENABLED(CONFIG_IPV6) /* Create UDP socket for encapsulation receive. AF_INET6 socket * could be used for both IPv4 and IPv6 communications, but * users may set bindv6only=1. */ static struct socket *create_v6_sock(struct net *net, __be16 port) { struct sock *sk; struct socket *sock; struct sockaddr_in6 vxlan_addr = { .sin6_family = AF_INET6, .sin6_port = port, }; int rc, val = 1; rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); if (rc < 0) { pr_debug("UDPv6 socket create failed\n"); return ERR_PTR(rc); } /* Put in proper namespace */ sk = sock->sk; sk_change_net(sk, net); kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, (char *)&val, sizeof(val)); rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr, sizeof(struct sockaddr_in6)); if (rc < 0) { pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n", &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc); sk_release_kernel(sk); return ERR_PTR(rc); } /* At this point, IPv6 module should have been loaded in * sock_create_kern(). */ BUG_ON(!ipv6_stub); /* Disable multicast loopback */ inet_sk(sk)->mc_loop = 0; return sock; } #else static struct socket *create_v6_sock(struct net *net, __be16 port) { return ERR_PTR(-EPFNOSUPPORT); } #endif static struct socket *create_v4_sock(struct net *net, __be16 port) { struct sock *sk; struct socket *sock; struct sockaddr_in vxlan_addr = { .sin_family = AF_INET, .sin_addr.s_addr = htonl(INADDR_ANY), .sin_port = port, }; int rc; /* Create UDP socket for encapsulation receive. */ rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); if (rc < 0) { pr_debug("UDP socket create failed\n"); return ERR_PTR(rc); } /* Put in proper namespace */ sk = sock->sk; sk_change_net(sk, net); rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr, sizeof(vxlan_addr)); if (rc < 0) { pr_debug("bind for UDP socket %pI4:%u (%d)\n", &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); sk_release_kernel(sk); return ERR_PTR(rc); } /* Disable multicast loopback */ inet_sk(sk)->mc_loop = 0; return sock; } /* Create new listen socket if needed */ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port, vxlan_rcv_t *rcv, void *data, bool ipv6) { struct vxlan_net *vn = net_generic(net, vxlan_net_id); struct vxlan_sock *vs; struct socket *sock; struct sock *sk; unsigned int h; vs = kzalloc(sizeof(*vs), GFP_KERNEL); if (!vs) return ERR_PTR(-ENOMEM); for (h = 0; h < VNI_HASH_SIZE; ++h) INIT_HLIST_HEAD(&vs->vni_list[h]); INIT_WORK(&vs->del_work, vxlan_del_work); if (ipv6) sock = create_v6_sock(net, port); else sock = create_v4_sock(net, port); if (IS_ERR(sock)) { kfree(vs); return ERR_CAST(sock); } vs->sock = sock; sk = sock->sk; atomic_set(&vs->refcnt, 1); vs->rcv = rcv; vs->data = data; rcu_assign_sk_user_data(vs->sock->sk, vs); /* Initialize the vxlan udp offloads structure */ vs->udp_offloads.port = port; vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive; vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete; spin_lock(&vn->sock_lock); hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); vxlan_notify_add_rx_port(vs); spin_unlock(&vn->sock_lock); /* Mark socket as an encapsulation socket. */ udp_sk(sk)->encap_type = 1; udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; #if IS_ENABLED(CONFIG_IPV6) if (ipv6) ipv6_stub->udpv6_encap_enable(); else #endif udp_encap_enable(); return vs; } struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, vxlan_rcv_t *rcv, void *data, bool no_share, bool ipv6) { struct vxlan_net *vn = net_generic(net, vxlan_net_id); struct vxlan_sock *vs; vs = vxlan_socket_create(net, port, rcv, data, ipv6); if (!IS_ERR(vs)) return vs; if (no_share) /* Return error if sharing is not allowed. */ return vs; spin_lock(&vn->sock_lock); vs = vxlan_find_sock(net, port); if (vs) { if (vs->rcv == rcv) atomic_inc(&vs->refcnt); else vs = ERR_PTR(-EBUSY); } spin_unlock(&vn->sock_lock); if (!vs) vs = ERR_PTR(-EINVAL); return vs; } EXPORT_SYMBOL_GPL(vxlan_sock_add); /* Scheduled at device creation to bind to a socket */ static void vxlan_sock_work(struct work_struct *work) { struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work); struct net *net = dev_net(vxlan->dev); struct vxlan_net *vn = net_generic(net, vxlan_net_id); __be16 port = vxlan->dst_port; struct vxlan_sock *nvs; nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6); spin_lock(&vn->sock_lock); if (!IS_ERR(nvs)) vxlan_vs_add_dev(nvs, vxlan); spin_unlock(&vn->sock_lock); dev_put(vxlan->dev); } static int vxlan_newlink(struct net *net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct vxlan_net *vn = net_generic(net, vxlan_net_id); struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_rdst *dst = &vxlan->default_dst; __u32 vni; int err; bool use_ipv6 = false; if (!data[IFLA_VXLAN_ID]) return -EINVAL; vni = nla_get_u32(data[IFLA_VXLAN_ID]); dst->remote_vni = vni; /* Unless IPv6 is explicitly requested, assume IPv4 */ dst->remote_ip.sa.sa_family = AF_INET; if (data[IFLA_VXLAN_GROUP]) { dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]); } else if (data[IFLA_VXLAN_GROUP6]) { if (!IS_ENABLED(CONFIG_IPV6)) return -EPFNOSUPPORT; nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6], sizeof(struct in6_addr)); dst->remote_ip.sa.sa_family = AF_INET6; use_ipv6 = true; } if (data[IFLA_VXLAN_LOCAL]) { vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); vxlan->saddr.sa.sa_family = AF_INET; } else if (data[IFLA_VXLAN_LOCAL6]) { if (!IS_ENABLED(CONFIG_IPV6)) return -EPFNOSUPPORT; /* TODO: respect scope id */ nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6], sizeof(struct in6_addr)); vxlan->saddr.sa.sa_family = AF_INET6; use_ipv6 = true; } if (data[IFLA_VXLAN_LINK] && (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) { struct net_device *lowerdev = __dev_get_by_index(net, dst->remote_ifindex); if (!lowerdev) { pr_info("ifindex %d does not exist\n", dst->remote_ifindex); return -ENODEV; } #if IS_ENABLED(CONFIG_IPV6) if (use_ipv6) { struct inet6_dev *idev = __in6_dev_get(lowerdev); if (idev && idev->cnf.disable_ipv6) { pr_info("IPv6 is disabled via sysctl\n"); return -EPERM; } vxlan->flags |= VXLAN_F_IPV6; } #endif if (!tb[IFLA_MTU]) dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM); /* update header length based on lower device */ dev->hard_header_len = lowerdev->hard_header_len + (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM); } else if (use_ipv6) vxlan->flags |= VXLAN_F_IPV6; if (data[IFLA_VXLAN_TOS]) vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); if (data[IFLA_VXLAN_TTL]) vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) vxlan->flags |= VXLAN_F_LEARN; if (data[IFLA_VXLAN_AGEING]) vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); else vxlan->age_interval = FDB_AGE_DEFAULT; if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) vxlan->flags |= VXLAN_F_PROXY; if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) vxlan->flags |= VXLAN_F_RSC; if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) vxlan->flags |= VXLAN_F_L2MISS; if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) vxlan->flags |= VXLAN_F_L3MISS; if (data[IFLA_VXLAN_LIMIT]) vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); if (data[IFLA_VXLAN_PORT_RANGE]) { const struct ifla_vxlan_port_range *p = nla_data(data[IFLA_VXLAN_PORT_RANGE]); vxlan->port_min = ntohs(p->low); vxlan->port_max = ntohs(p->high); } if (data[IFLA_VXLAN_PORT]) vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); if (vxlan_find_vni(net, vni, vxlan->dst_port)) { pr_info("duplicate VNI %u\n", vni); return -EEXIST; } SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); /* create an fdb entry for a valid default destination */ if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) { err = vxlan_fdb_create(vxlan, all_zeros_mac, &vxlan->default_dst.remote_ip, NUD_REACHABLE|NUD_PERMANENT, NLM_F_EXCL|NLM_F_CREATE, vxlan->dst_port, vxlan->default_dst.remote_vni, vxlan->default_dst.remote_ifindex, NTF_SELF); if (err) return err; } err = register_netdevice(dev); if (err) { vxlan_fdb_delete_default(vxlan); return err; } list_add(&vxlan->next, &vn->vxlan_list); return 0; } static void vxlan_dellink(struct net_device *dev, struct list_head *head) { struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); struct vxlan_dev *vxlan = netdev_priv(dev); spin_lock(&vn->sock_lock); if (!hlist_unhashed(&vxlan->hlist)) hlist_del_rcu(&vxlan->hlist); spin_unlock(&vn->sock_lock); list_del(&vxlan->next); unregister_netdevice_queue(dev, head); } static size_t vxlan_get_size(const struct net_device *dev) { return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ nla_total_size(sizeof(struct ifla_vxlan_port_range)) + nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */ 0; } static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) { const struct vxlan_dev *vxlan = netdev_priv(dev); const struct vxlan_rdst *dst = &vxlan->default_dst; struct ifla_vxlan_port_range ports = { .low = htons(vxlan->port_min), .high = htons(vxlan->port_max), }; if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni)) goto nla_put_failure; if (!vxlan_addr_any(&dst->remote_ip)) { if (dst->remote_ip.sa.sa_family == AF_INET) { if (nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip.sin.sin_addr.s_addr)) goto nla_put_failure; #if IS_ENABLED(CONFIG_IPV6) } else { if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr), &dst->remote_ip.sin6.sin6_addr)) goto nla_put_failure; #endif } } if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) goto nla_put_failure; if (!vxlan_addr_any(&vxlan->saddr)) { if (vxlan->saddr.sa.sa_family == AF_INET) { if (nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr.sin.sin_addr.s_addr)) goto nla_put_failure; #if IS_ENABLED(CONFIG_IPV6) } else { if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr), &vxlan->saddr.sin6.sin6_addr)) goto nla_put_failure; #endif } } if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || nla_put_u8(skb, IFLA_VXLAN_LEARNING, !!(vxlan->flags & VXLAN_F_LEARN)) || nla_put_u8(skb, IFLA_VXLAN_PROXY, !!(vxlan->flags & VXLAN_F_PROXY)) || nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || nla_put_u8(skb, IFLA_VXLAN_L2MISS, !!(vxlan->flags & VXLAN_F_L2MISS)) || nla_put_u8(skb, IFLA_VXLAN_L3MISS, !!(vxlan->flags & VXLAN_F_L3MISS)) || nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) || nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port)) goto nla_put_failure; if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; } static struct rtnl_link_ops vxlan_link_ops __read_mostly = { .kind = "vxlan", .maxtype = IFLA_VXLAN_MAX, .policy = vxlan_policy, .priv_size = sizeof(struct vxlan_dev), .setup = vxlan_setup, .validate = vxlan_validate, .newlink = vxlan_newlink, .dellink = vxlan_dellink, .get_size = vxlan_get_size, .fill_info = vxlan_fill_info, }; static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, struct net_device *dev) { struct vxlan_dev *vxlan, *next; LIST_HEAD(list_kill); list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { struct vxlan_rdst *dst = &vxlan->default_dst; /* In case we created vxlan device with carrier * and we loose the carrier due to module unload * we also need to remove vxlan device. In other * cases, it's not necessary and remote_ifindex * is 0 here, so no matches. */ if (dst->remote_ifindex == dev->ifindex) vxlan_dellink(vxlan->dev, &list_kill); } unregister_netdevice_many(&list_kill); } static int vxlan_lowerdev_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); if (event == NETDEV_UNREGISTER) vxlan_handle_lowerdev_unregister(vn, dev); return NOTIFY_DONE; } static struct notifier_block vxlan_notifier_block __read_mostly = { .notifier_call = vxlan_lowerdev_event, }; static __net_init int vxlan_init_net(struct net *net) { struct vxlan_net *vn = net_generic(net, vxlan_net_id); unsigned int h; INIT_LIST_HEAD(&vn->vxlan_list); spin_lock_init(&vn->sock_lock); for (h = 0; h < PORT_HASH_SIZE; ++h) INIT_HLIST_HEAD(&vn->sock_list[h]); return 0; } static struct pernet_operations vxlan_net_ops = { .init = vxlan_init_net, .id = &vxlan_net_id, .size = sizeof(struct vxlan_net), }; static int __init vxlan_init_module(void) { int rc; vxlan_wq = alloc_workqueue("vxlan", 0, 0); if (!vxlan_wq) return -ENOMEM; get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); rc = register_pernet_subsys(&vxlan_net_ops); if (rc) goto out1; rc = register_netdevice_notifier(&vxlan_notifier_block); if (rc) goto out2; rc = rtnl_link_register(&vxlan_link_ops); if (rc) goto out3; return 0; out3: unregister_netdevice_notifier(&vxlan_notifier_block); out2: unregister_pernet_subsys(&vxlan_net_ops); out1: destroy_workqueue(vxlan_wq); return rc; } late_initcall(vxlan_init_module); static void __exit vxlan_cleanup_module(void) { rtnl_link_unregister(&vxlan_link_ops); unregister_netdevice_notifier(&vxlan_notifier_block); destroy_workqueue(vxlan_wq); unregister_pernet_subsys(&vxlan_net_ops); /* rcu_barrier() is called by netns */ } module_exit(vxlan_cleanup_module); MODULE_LICENSE("GPL"); MODULE_VERSION(VXLAN_VERSION); MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); MODULE_ALIAS_RTNL_LINK("vxlan");