diff options
Diffstat (limited to 'drivers/net/vxlan.c')
| -rw-r--r-- | drivers/net/vxlan.c | 4511 |
1 files changed, 0 insertions, 4511 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c deleted file mode 100644 index d3b08b76b1ec..000000000000 --- a/drivers/net/vxlan.c +++ /dev/null @@ -1,4511 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * VXLAN: Virtual eXtensible Local Area Network - * - * Copyright (c) 2012-2013 Vyatta Inc. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/udp.h> -#include <linux/igmp.h> -#include <linux/if_ether.h> -#include <linux/ethtool.h> -#include <net/arp.h> -#include <net/ndisc.h> -#include <net/ipv6_stubs.h> -#include <net/ip.h> -#include <net/icmp.h> -#include <net/rtnetlink.h> -#include <net/inet_ecn.h> -#include <net/net_namespace.h> -#include <net/netns/generic.h> -#include <net/tun_proto.h> -#include <net/vxlan.h> - -#if IS_ENABLED(CONFIG_IPV6) -#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 FDB_AGE_DEFAULT 300 /* 5 min */ -#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ - -/* 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 unsigned int vxlan_net_id; -static struct rtnl_link_ops vxlan_link_ops; - -static const u8 all_zeros_mac[ETH_ALEN + 2]; - -static int vxlan_sock_add(struct vxlan_dev *vxlan); - -static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); - -/* 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; -}; - -/* 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; - u8 eth_addr[ETH_ALEN]; - u16 state; /* see ndm_state */ - __be32 vni; - u16 flags; /* see ndm_flags and below */ -}; - -#define NTF_VXLAN_ADDED_BY_USER 0x100 - -/* salt for hash table */ -static u32 vxlan_salt __read_mostly; - -static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) -{ - return vs->flags & VXLAN_F_COLLECT_METADATA || - ip_tunnel_collect_metadata(); -} - -#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 int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) -{ - if (nla_len(nla) >= sizeof(struct in6_addr)) { - ip->sin6.sin6_addr = nla_get_in6_addr(nla); - ip->sa.sa_family = AF_INET6; - return 0; - } else if (nla_len(nla) >= sizeof(__be32)) { - ip->sin.sin_addr.s_addr = nla_get_in_addr(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_in6_addr(skb, attr, &ip->sin6.sin6_addr); - else - return nla_put_in_addr(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 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_in_addr(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_in_addr(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, __be32 vni) -{ - return &vs->vni_list[hash_32((__force u32)vni, 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, address family and UDP port - * and enabled unshareable flags. - */ -static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, - __be16 port, u32 flags, int ifindex) -{ - struct vxlan_sock *vs; - - flags &= VXLAN_F_RCV_FLAGS; - - hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { - if (inet_sk(vs->sock->sk)->inet_sport == port && - vxlan_get_sk_family(vs) == family && - vs->flags == flags && - vs->sock->sk->sk_bound_dev_if == ifindex) - return vs; - } - return NULL; -} - -static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex, - __be32 vni) -{ - struct vxlan_dev_node *node; - - /* For flow based devices, map all packets to VNI 0 */ - if (vs->flags & VXLAN_F_COLLECT_METADATA) - vni = 0; - - hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { - if (node->vxlan->default_dst.remote_vni != vni) - continue; - - if (IS_ENABLED(CONFIG_IPV6)) { - const struct vxlan_config *cfg = &node->vxlan->cfg; - - if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && - cfg->remote_ifindex != ifindex) - continue; - } - - return node->vxlan; - } - - return NULL; -} - -/* Look up VNI in a per net namespace table */ -static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, - __be32 vni, sa_family_t family, - __be16 port, u32 flags) -{ - struct vxlan_sock *vs; - - vs = vxlan_find_sock(net, family, port, flags, ifindex); - if (!vs) - return NULL; - - return vxlan_vs_find_vni(vs, ifindex, vni); -} - -/* 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) { - send_ip = !vxlan_addr_any(&rdst->remote_ip); - send_eth = !is_zero_ether_addr(fdb->eth_addr); - ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; - } else - ndm->ndm_family = AF_BRIDGE; - ndm->ndm_state = fdb->state; - ndm->ndm_ifindex = vxlan->dev->ifindex; - ndm->ndm_flags = fdb->flags; - if (rdst->offloaded) - ndm->ndm_flags |= NTF_OFFLOADED; - ndm->ndm_type = RTN_UNICAST; - - if (!net_eq(dev_net(vxlan->dev), vxlan->net) && - nla_put_s32(skb, NDA_LINK_NETNSID, - peernet2id(dev_net(vxlan->dev), vxlan->net))) - goto nla_put_failure; - - 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->cfg.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, be32_to_cpu(rdst->remote_vni))) - goto nla_put_failure; - if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && - nla_put_u32(skb, NDA_SRC_VNI, - be32_to_cpu(fdb->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; - - nlmsg_end(skb, nlh); - return 0; - -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(__s32)) /* NDA_LINK_NETNSID */ - + 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_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, - const struct vxlan_fdb *fdb, - const struct vxlan_rdst *rd, - struct netlink_ext_ack *extack, - struct switchdev_notifier_vxlan_fdb_info *fdb_info) -{ - fdb_info->info.dev = vxlan->dev; - fdb_info->info.extack = extack; - fdb_info->remote_ip = rd->remote_ip; - fdb_info->remote_port = rd->remote_port; - fdb_info->remote_vni = rd->remote_vni; - fdb_info->remote_ifindex = rd->remote_ifindex; - memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); - fdb_info->vni = fdb->vni; - fdb_info->offloaded = rd->offloaded; - fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; -} - -static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, - struct vxlan_fdb *fdb, - struct vxlan_rdst *rd, - bool adding, - struct netlink_ext_ack *extack) -{ - struct switchdev_notifier_vxlan_fdb_info info; - enum switchdev_notifier_type notifier_type; - int ret; - - if (WARN_ON(!rd)) - return 0; - - notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE - : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; - vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); - ret = call_switchdev_notifiers(notifier_type, vxlan->dev, - &info.info, extack); - return notifier_to_errno(ret); -} - -static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, - struct vxlan_rdst *rd, int type, bool swdev_notify, - struct netlink_ext_ack *extack) -{ - int err; - - if (swdev_notify) { - switch (type) { - case RTM_NEWNEIGH: - err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, - true, extack); - if (err) - return err; - break; - case RTM_DELNEIGH: - vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, - false, extack); - break; - } - } - - __vxlan_fdb_notify(vxlan, fdb, rd, type); - return 0; -} - -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 = cpu_to_be32(VXLAN_N_VID), - }; - - vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); -} - -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, true, NULL); -} - -/* 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); -} - -static u32 eth_vni_hash(const unsigned char *addr, __be32 vni) -{ - /* use 1 byte of OUI and 3 bytes of NIC */ - u32 key = get_unaligned((u32 *)(addr + 2)); - - return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); -} - -static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) -{ - if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) - return eth_vni_hash(mac, vni); - else - return eth_hash(mac); -} - -/* Hash chain to use given mac address */ -static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, - const u8 *mac, __be32 vni) -{ - return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; -} - -/* Look up Ethernet address in forwarding table */ -static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, - const u8 *mac, __be32 vni) -{ - struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); - struct vxlan_fdb *f; - - hlist_for_each_entry_rcu(f, head, hlist) { - if (ether_addr_equal(mac, f->eth_addr)) { - if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { - if (vni == f->vni) - return f; - } else { - return f; - } - } - } - - return NULL; -} - -static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, - const u8 *mac, __be32 vni) -{ - struct vxlan_fdb *f; - - f = __vxlan_find_mac(vxlan, mac, vni); - if (f && f->used != jiffies) - 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, - __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; -} - -int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, - struct switchdev_notifier_vxlan_fdb_info *fdb_info) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - u8 eth_addr[ETH_ALEN + 2] = { 0 }; - struct vxlan_rdst *rdst; - struct vxlan_fdb *f; - int rc = 0; - - if (is_multicast_ether_addr(mac) || - is_zero_ether_addr(mac)) - return -EINVAL; - - ether_addr_copy(eth_addr, mac); - - rcu_read_lock(); - - f = __vxlan_find_mac(vxlan, eth_addr, vni); - if (!f) { - rc = -ENOENT; - goto out; - } - - rdst = first_remote_rcu(f); - vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); - -out: - rcu_read_unlock(); - return rc; -} -EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); - -static int vxlan_fdb_notify_one(struct notifier_block *nb, - const struct vxlan_dev *vxlan, - const struct vxlan_fdb *f, - const struct vxlan_rdst *rdst, - struct netlink_ext_ack *extack) -{ - struct switchdev_notifier_vxlan_fdb_info fdb_info; - int rc; - - vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); - rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, - &fdb_info); - return notifier_to_errno(rc); -} - -int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, - struct notifier_block *nb, - struct netlink_ext_ack *extack) -{ - struct vxlan_dev *vxlan; - struct vxlan_rdst *rdst; - struct vxlan_fdb *f; - unsigned int h; - int rc = 0; - - if (!netif_is_vxlan(dev)) - return -EINVAL; - vxlan = netdev_priv(dev); - - for (h = 0; h < FDB_HASH_SIZE; ++h) { - spin_lock_bh(&vxlan->hash_lock[h]); - hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { - if (f->vni == vni) { - list_for_each_entry(rdst, &f->remotes, list) { - rc = vxlan_fdb_notify_one(nb, vxlan, - f, rdst, - extack); - if (rc) - goto unlock; - } - } - } - spin_unlock_bh(&vxlan->hash_lock[h]); - } - return 0; - -unlock: - spin_unlock_bh(&vxlan->hash_lock[h]); - return rc; -} -EXPORT_SYMBOL_GPL(vxlan_fdb_replay); - -void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) -{ - struct vxlan_dev *vxlan; - struct vxlan_rdst *rdst; - struct vxlan_fdb *f; - unsigned int h; - - if (!netif_is_vxlan(dev)) - return; - vxlan = netdev_priv(dev); - - for (h = 0; h < FDB_HASH_SIZE; ++h) { - spin_lock_bh(&vxlan->hash_lock[h]); - hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) - if (f->vni == vni) - list_for_each_entry(rdst, &f->remotes, list) - rdst->offloaded = false; - spin_unlock_bh(&vxlan->hash_lock[h]); - } - -} -EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); - -/* 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 *oldrd) -{ - 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; - - *oldrd = *rd; - dst_cache_reset(&rd->dst_cache); - rd->remote_ip = *ip; - rd->remote_port = port; - rd->remote_vni = vni; - rd->remote_ifindex = ifindex; - rd->offloaded = false; - 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->offloaded = false; - 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(const u8 *mac, __u16 state, - __be32 src_vni, __u16 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 void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, - __be32 src_vni, struct vxlan_fdb *f) -{ - ++vxlan->addrcnt; - hlist_add_head_rcu(&f->hlist, - vxlan_fdb_head(vxlan, mac, src_vni)); -} - -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, __u16 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(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; - } - - *fdb = f; - - return 0; -} - -static void __vxlan_fdb_free(struct vxlan_fdb *f) -{ - 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_free(struct rcu_head *head) -{ - struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); - - __vxlan_fdb_free(f); -} - -static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, - bool do_notify, bool swdev_notify) -{ - struct vxlan_rdst *rd; - - netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); - - --vxlan->addrcnt; - if (do_notify) - list_for_each_entry(rd, &f->remotes, list) - vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, - swdev_notify, NULL); - - 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 int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, - union vxlan_addr *ip, - __u16 state, __u16 flags, - __be16 port, __be32 vni, - __u32 ifindex, __u16 ndm_flags, - struct vxlan_fdb *f, - bool swdev_notify, - struct netlink_ext_ack *extack) -{ - __u16 fdb_flags = (ndm_flags & ~NTF_USE); - struct vxlan_rdst *rd = NULL; - struct vxlan_rdst oldrd; - int notify = 0; - int rc = 0; - int err; - - /* Do not allow an externally learned entry to take over an entry added - * by the user. - */ - if (!(fdb_flags & NTF_EXT_LEARNED) || - !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { - if (f->state != state) { - f->state = state; - f->updated = jiffies; - notify = 1; - } - if (f->flags != fdb_flags) { - f->flags = fdb_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))) { - rc = vxlan_fdb_replace(f, ip, port, vni, - ifindex, &oldrd); - notify |= rc; - } 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; - } - - if (ndm_flags & NTF_USE) - f->used = jiffies; - - if (notify) { - if (rd == NULL) - rd = first_remote_rtnl(f); - - err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, - swdev_notify, extack); - if (err) - goto err_notify; - } - - return 0; - -err_notify: - if ((flags & NLM_F_REPLACE) && rc) - *rd = oldrd; - else if ((flags & NLM_F_APPEND) && rc) { - list_del_rcu(&rd->list); - call_rcu(&rd->rcu, vxlan_dst_free); - } - return err; -} - -static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, - const u8 *mac, union vxlan_addr *ip, - __u16 state, __u16 flags, - __be16 port, __be32 src_vni, __be32 vni, - __u32 ifindex, __u16 ndm_flags, - bool swdev_notify, - struct netlink_ext_ack *extack) -{ - __u16 fdb_flags = (ndm_flags & ~NTF_USE); - struct vxlan_fdb *f; - int rc; - - /* 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, fdb_flags, &f); - if (rc < 0) - return rc; - - vxlan_fdb_insert(vxlan, mac, src_vni, f); - rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, - swdev_notify, extack); - if (rc) - goto err_notify; - - return 0; - -err_notify: - vxlan_fdb_destroy(vxlan, f, false, false); - return rc; -} - -/* 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, __u16 ndm_flags, - bool swdev_notify, - struct netlink_ext_ack *extack) -{ - struct vxlan_fdb *f; - - 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; - } - - return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, - vni, ifindex, ndm_flags, f, - swdev_notify, extack); - } else { - if (!(flags & NLM_F_CREATE)) - return -ENOENT; - - return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, - port, src_vni, vni, ifindex, - ndm_flags, swdev_notify, extack); - } -} - -static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, - struct vxlan_rdst *rd, bool swdev_notify) -{ - list_del_rcu(&rd->list); - vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); - 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 netlink_ext_ack *extack) -{ - 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; - u32 hash_index; - 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; - - hash_index = fdb_head_index(vxlan, addr, src_vni); - spin_lock_bh(&vxlan->hash_lock[hash_index]); - err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, - port, src_vni, vni, ifindex, - ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, - true, extack); - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - - 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, bool swdev_notify) -{ - 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, swdev_notify); - goto out; - } - - vxlan_fdb_destroy(vxlan, f, true, swdev_notify); - -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; - u32 hash_index; - int err; - - err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex); - if (err) - return err; - - hash_index = fdb_head_index(vxlan, addr, src_vni); - spin_lock_bh(&vxlan->hash_lock[hash_index]); - err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, - true); - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - - 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; - - 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) - goto out; -skip: - *idx += 1; - } - } - } -out: - return err; -} - -static int vxlan_fdb_get(struct sk_buff *skb, - struct nlattr *tb[], - struct net_device *dev, - const unsigned char *addr, - u16 vid, u32 portid, u32 seq, - struct netlink_ext_ack *extack) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - struct vxlan_fdb *f; - __be32 vni; - int err; - - if (tb[NDA_VNI]) - vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); - else - vni = vxlan->default_dst.remote_vni; - - rcu_read_lock(); - - f = __vxlan_find_mac(vxlan, addr, vni); - if (!f) { - NL_SET_ERR_MSG(extack, "Fdb entry not found"); - err = -ENOENT; - goto errout; - } - - err = vxlan_fdb_info(skb, vxlan, f, portid, seq, - RTM_NEWNEIGH, 0, first_remote_rcu(f)); -errout: - rcu_read_unlock(); - 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, true, NULL); - } else { - u32 hash_index = fdb_head_index(vxlan, src_mac, vni); - - /* learned new entry */ - spin_lock(&vxlan->hash_lock[hash_index]); - - /* 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, true, NULL); - spin_unlock(&vxlan->hash_lock[hash_index]); - } - - 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; -} - -/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ -static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) -{ - struct vxlan_dev *vxlan; - struct vxlan_sock *vs; - struct vxlanhdr *hdr; - __be32 vni; - - if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) - return -EINVAL; - - hdr = vxlan_hdr(skb); - - if (!(hdr->vx_flags & VXLAN_HF_VNI)) - return -EINVAL; - - vs = rcu_dereference_sk_user_data(sk); - if (!vs) - return -ENOENT; - - vni = vxlan_vni(hdr->vx_vni); - vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni); - if (!vxlan) - return -ENOENT; - - 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] == 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; - - 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: - 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 (!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; - - if (!ifindex) - ifindex = sock4->sock->sk->sk_bound_dev_if; - - 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; - } - - if (!info) { - /* Bypass encapsulation if the destination is local */ - err = encap_bypass_if_local(skb, dev, vxlan, dst, - dst_port, ifindex, vni, - &rt->dst, rt->rt_flags); - if (err) - goto out_unlock; - - if (vxlan->cfg.df == VXLAN_DF_SET) { - df = htons(IP_DF); - } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { - struct ethhdr *eth = eth_hdr(skb); - - if (ntohs(eth->h_proto) == ETH_P_IPV6 || - (ntohs(eth->h_proto) == ETH_P_IP && - old_iph->frag_off & htons(IP_DF))) - df = htons(IP_DF); - } - } 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(RT_TOS(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); - - if (!ifindex) - ifindex = sock6->sock->sk->sk_bound_dev_if; - - 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(RT_TOS(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(&vxlan->hash_lock[h]); - 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, true); - } else if (time_before(timeout, next_timer)) - next_timer = timeout; - } - spin_unlock(&vxlan->hash_lock[h]); - } - - 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) -{ - dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); - if (!dev->tstats) - return -ENOMEM; - - return 0; -} - -static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) -{ - struct vxlan_fdb *f; - u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); - - spin_lock_bh(&vxlan->hash_lock[hash_index]); - f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); - if (f) - vxlan_fdb_destroy(vxlan, f, true, true); - spin_unlock_bh(&vxlan->hash_lock[hash_index]); -} - -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; - - for (h = 0; h < FDB_HASH_SIZE; ++h) { - struct hlist_node *p, *n; - - spin_lock_bh(&vxlan->hash_lock[h]); - 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, true); - } - spin_unlock_bh(&vxlan->hash_lock[h]); - } -} - -/* 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_fdb_get = vxlan_fdb_get, - .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, - .ndo_change_proto_down = dev_change_proto_down_generic, -}; - -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); - - timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); - - vxlan->dev = dev; - - gro_cells_init(&vxlan->gro_cells, dev); - - for (h = 0; h < FDB_HASH_SIZE; ++h) { - spin_lock_init(&vxlan->hash_lock[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 = sizeof_field(struct iphdr, daddr) }, - [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, - [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, - [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(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 }, - [IFLA_VXLAN_DF] = { .type = NLA_U8 }, -}; - -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; - } - } - - if (data[IFLA_VXLAN_DF]) { - enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); - - if (df < 0 || df > VXLAN_DF_MAX) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF], - "Invalid DF attribute"); - 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 int vxlan_get_link_ksettings(struct net_device *dev, - struct ethtool_link_ksettings *cmd) -{ - 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); - - if (!lowerdev) { - cmd->base.duplex = DUPLEX_UNKNOWN; - cmd->base.port = PORT_OTHER; - cmd->base.speed = SPEED_UNKNOWN; - - return 0; - } - - return __ethtool_get_link_ksettings(lowerdev, cmd); -} - -static const struct ethtool_ops vxlan_ethtool_ops = { - .get_drvinfo = vxlan_get_drvinfo, - .get_link = ethtool_op_get_link, - .get_link_ksettings = vxlan_get_link_ksettings, -}; - -static struct socket *vxlan_create_sock(struct net *net, bool ipv6, - __be16 port, u32 flags, int ifindex) -{ - 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; - udp_conf.bind_ifindex = ifindex; - - /* 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, - int ifindex) -{ - 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, ifindex); - 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_err_lookup = vxlan_err_lookup; - 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; - int l3mdev_index = 0; - - if (vxlan->cfg.remote_ifindex) - l3mdev_index = l3mdev_master_upper_ifindex_by_index( - vxlan->net, vxlan->cfg.remote_ifindex); - - 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, - l3mdev_index); - 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, - l3mdev_index); - 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; - - 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 net_device *remote_dev = NULL; - struct vxlan_fdb *f = NULL; - bool unregister = false; - struct vxlan_rdst *dst; - int err; - - dst = &vxlan->default_dst; - 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(&dst->remote_ip)) { - err = vxlan_fdb_create(vxlan, all_zeros_mac, - &dst->remote_ip, - NUD_REACHABLE | NUD_PERMANENT, - vxlan->cfg.dst_port, - dst->remote_vni, - dst->remote_vni, - dst->remote_ifindex, - NTF_SELF, &f); - if (err) - return err; - } - - err = register_netdevice(dev); - if (err) - goto errout; - unregister = true; - - if (dst->remote_ifindex) { - remote_dev = __dev_get_by_index(net, dst->remote_ifindex); - if (!remote_dev) - goto errout; - - err = netdev_upper_dev_link(remote_dev, dev, extack); - if (err) - goto errout; - } - - err = rtnl_configure_link(dev, NULL); - if (err) - goto unlink; - - if (f) { - vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); - - /* notify default fdb entry */ - err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), - RTM_NEWNEIGH, true, extack); - if (err) { - vxlan_fdb_destroy(vxlan, f, false, false); - if (remote_dev) - netdev_upper_dev_unlink(remote_dev, dev); - goto unregister; - } - } - - list_add(&vxlan->next, &vn->vxlan_list); - if (remote_dev) - dst->remote_dev = remote_dev; - return 0; -unlink: - if (remote_dev) - netdev_upper_dev_unlink(remote_dev, dev); -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_free(f); -unregister: - if (unregister) - unregister_netdevice(dev); - return err; -} - -/* Set/clear flags based on attribute */ -static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], - int attrtype, unsigned long mask, bool changelink, - bool changelink_supported, - struct netlink_ext_ack *extack) -{ - unsigned long flags; - - if (!tb[attrtype]) - return 0; - - if (changelink && !changelink_supported) { - vxlan_flag_attr_error(attrtype, extack); - return -EOPNOTSUPP; - } - - if (vxlan_policy[attrtype].type == NLA_FLAG) - flags = conf->flags | mask; - else if (nla_get_u8(tb[attrtype])) - flags = conf->flags | mask; - else - flags = conf->flags & ~mask; - - conf->flags = flags; - - return 0; -} - -static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], - struct net_device *dev, struct vxlan_config *conf, - bool changelink, struct netlink_ext_ack *extack) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - int err = 0; - - 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)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change 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)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); - 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)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); - return -EPFNOSUPPORT; - } - - if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); - 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)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); - 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)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); - return -EPFNOSUPPORT; - } - - if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); - 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]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, - VXLAN_F_TTL_INHERIT, changelink, false, - extack); - if (err) - return err; - - } - - if (data[IFLA_VXLAN_LABEL]) - conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & - IPV6_FLOWLABEL_MASK; - - if (data[IFLA_VXLAN_LEARNING]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, - VXLAN_F_LEARN, changelink, true, - extack); - if (err) - return err; - } else if (!changelink) { - /* default to learn on a new device */ - conf->flags |= VXLAN_F_LEARN; - } - - if (data[IFLA_VXLAN_AGEING]) - conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); - - if (data[IFLA_VXLAN_PROXY]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, - VXLAN_F_PROXY, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_RSC]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, - VXLAN_F_RSC, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_L2MISS]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, - VXLAN_F_L2MISS, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_L3MISS]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, - VXLAN_F_L3MISS, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_LIMIT]) { - if (changelink) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], - "Cannot change limit"); - return -EOPNOTSUPP; - } - conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); - } - - if (data[IFLA_VXLAN_COLLECT_METADATA]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, - VXLAN_F_COLLECT_METADATA, changelink, false, - extack); - if (err) - return err; - } - - 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 { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], - "Cannot change port range"); - return -EOPNOTSUPP; - } - } - - if (data[IFLA_VXLAN_PORT]) { - if (changelink) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], - "Cannot change port"); - return -EOPNOTSUPP; - } - conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); - } - - if (data[IFLA_VXLAN_UDP_CSUM]) { - if (changelink) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], - "Cannot change UDP_CSUM flag"); - 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]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, - VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, - false, extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, - VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, - false, extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_REMCSUM_TX]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, - VXLAN_F_REMCSUM_TX, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_REMCSUM_RX]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, - VXLAN_F_REMCSUM_RX, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_GBP]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, - VXLAN_F_GBP, changelink, false, extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_GPE]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, - VXLAN_F_GPE, changelink, false, - extack); - if (err) - return err; - } - - if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { - err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, - VXLAN_F_REMCSUM_NOPARTIAL, changelink, - false, extack); - if (err) - return err; - } - - if (tb[IFLA_MTU]) { - if (changelink) { - NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], - "Cannot change mtu"); - return -EOPNOTSUPP; - } - conf->mtu = nla_get_u32(tb[IFLA_MTU]); - } - - if (data[IFLA_VXLAN_DF]) - conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); - - 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, extack); - 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 net_device *lowerdev; - struct vxlan_config conf; - struct vxlan_rdst *dst; - int err; - - dst = &vxlan->default_dst; - err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); - if (err) - return err; - - err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, - vxlan, extack); - if (err) - return err; - - if (dst->remote_dev == lowerdev) - lowerdev = NULL; - - err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, - extack); - if (err) - return err; - - /* handle default dst entry */ - if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { - u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); - - spin_lock_bh(&vxlan->hash_lock[hash_index]); - if (!vxlan_addr_any(&conf.remote_ip)) { - err = vxlan_fdb_update(vxlan, all_zeros_mac, - &conf.remote_ip, - NUD_REACHABLE | NUD_PERMANENT, - NLM_F_APPEND | NLM_F_CREATE, - vxlan->cfg.dst_port, - conf.vni, conf.vni, - conf.remote_ifindex, - NTF_SELF, true, extack); - if (err) { - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - netdev_adjacent_change_abort(dst->remote_dev, - lowerdev, dev); - return err; - } - } - if (!vxlan_addr_any(&dst->remote_ip)) - __vxlan_fdb_delete(vxlan, all_zeros_mac, - dst->remote_ip, - vxlan->cfg.dst_port, - dst->remote_vni, - dst->remote_vni, - dst->remote_ifindex, - true); - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - } - - if (conf.age_interval != vxlan->cfg.age_interval) - mod_timer(&vxlan->age_timer, jiffies); - - netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); - if (lowerdev && lowerdev != dst->remote_dev) { - dst->remote_dev = lowerdev; - netdev_update_lockdep_key(lowerdev); - } - vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); - 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); - if (vxlan->default_dst.remote_dev) - netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); -} - -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(__u8)) + /* IFLA_VXLAN_DF */ - 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_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || - 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, NULL); - 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 void -vxlan_fdb_offloaded_set(struct net_device *dev, - struct switchdev_notifier_vxlan_fdb_info *fdb_info) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - struct vxlan_rdst *rdst; - struct vxlan_fdb *f; - u32 hash_index; - - hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); - - spin_lock_bh(&vxlan->hash_lock[hash_index]); - - f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); - if (!f) - goto out; - - rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, - fdb_info->remote_port, - fdb_info->remote_vni, - fdb_info->remote_ifindex); - if (!rdst) - goto out; - - rdst->offloaded = fdb_info->offloaded; - -out: - spin_unlock_bh(&vxlan->hash_lock[hash_index]); -} - -static int -vxlan_fdb_external_learn_add(struct net_device *dev, - struct switchdev_notifier_vxlan_fdb_info *fdb_info) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - struct netlink_ext_ack *extack; - u32 hash_index; - int err; - - hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); - extack = switchdev_notifier_info_to_extack(&fdb_info->info); - - spin_lock_bh(&vxlan->hash_lock[hash_index]); - err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, - NUD_REACHABLE, - NLM_F_CREATE | NLM_F_REPLACE, - fdb_info->remote_port, - fdb_info->vni, - fdb_info->remote_vni, - fdb_info->remote_ifindex, - NTF_USE | NTF_SELF | NTF_EXT_LEARNED, - false, extack); - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - - return err; -} - -static int -vxlan_fdb_external_learn_del(struct net_device *dev, - struct switchdev_notifier_vxlan_fdb_info *fdb_info) -{ - struct vxlan_dev *vxlan = netdev_priv(dev); - struct vxlan_fdb *f; - u32 hash_index; - int err = 0; - - hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); - spin_lock_bh(&vxlan->hash_lock[hash_index]); - - f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); - if (!f) - err = -ENOENT; - else if (f->flags & NTF_EXT_LEARNED) - err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, - fdb_info->remote_ip, - fdb_info->remote_port, - fdb_info->vni, - fdb_info->remote_vni, - fdb_info->remote_ifindex, - false); - - spin_unlock_bh(&vxlan->hash_lock[hash_index]); - - return err; -} - -static int vxlan_switchdev_event(struct notifier_block *unused, - unsigned long event, void *ptr) -{ - struct net_device *dev = switchdev_notifier_info_to_dev(ptr); - struct switchdev_notifier_vxlan_fdb_info *fdb_info; - int err = 0; - - switch (event) { - case SWITCHDEV_VXLAN_FDB_OFFLOADED: - vxlan_fdb_offloaded_set(dev, ptr); - break; - case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: - fdb_info = ptr; - err = vxlan_fdb_external_learn_add(dev, fdb_info); - if (err) { - err = notifier_from_errno(err); - break; - } - fdb_info->offloaded = true; - vxlan_fdb_offloaded_set(dev, fdb_info); - break; - case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: - fdb_info = ptr; - err = vxlan_fdb_external_learn_del(dev, fdb_info); - if (err) { - err = notifier_from_errno(err); - break; - } - fdb_info->offloaded = false; - vxlan_fdb_offloaded_set(dev, fdb_info); - break; - } - - return err; -} - -static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { - .notifier_call = vxlan_switchdev_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; - unsigned int h; - - 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); - } - - for (h = 0; h < PORT_HASH_SIZE; ++h) - WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); -} - -static void __net_exit vxlan_exit_batch_net(struct list_head *net_list) -{ - struct net *net; - LIST_HEAD(list); - - rtnl_lock(); - list_for_each_entry(net, net_list, exit_list) - vxlan_destroy_tunnels(net, &list); - - unregister_netdevice_many(&list); - rtnl_unlock(); -} - -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 = register_switchdev_notifier(&vxlan_switchdev_notifier_block); - if (rc) - goto out3; - - rc = rtnl_link_register(&vxlan_link_ops); - if (rc) - goto out4; - - return 0; -out4: - unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); -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_switchdev_notifier(&vxlan_switchdev_notifier_block); - 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"); |