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https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
vxlan: support both IPv4 and IPv6 sockets in a single vxlan device
For metadata based vxlan interface, open both IPv4 and IPv6 socket. This is much more user friendly: it's not necessary to create two vxlan interfaces and pay attention to using the right one in routing rules. Signed-off-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc
David S. Miller
parent
205f356d16
commit
b1be00a6c3
3 changed files with 103 additions and 42 deletions
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@ -993,19 +993,30 @@ static bool vxlan_snoop(struct net_device *dev,
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static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
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{
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struct vxlan_dev *vxlan;
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unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
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/* The vxlan_sock is only used by dev, leaving group has
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* no effect on other vxlan devices.
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*/
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if (atomic_read(&dev->vn_sock->refcnt) == 1)
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if (family == AF_INET && dev->vn4_sock &&
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atomic_read(&dev->vn4_sock->refcnt) == 1)
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return false;
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#if IS_ENABLED(CONFIG_IPV6)
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if (family == AF_INET6 && dev->vn6_sock &&
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atomic_read(&dev->vn6_sock->refcnt) == 1)
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return false;
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#endif
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list_for_each_entry(vxlan, &vn->vxlan_list, next) {
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if (!netif_running(vxlan->dev) || vxlan == dev)
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continue;
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if (vxlan->vn_sock != dev->vn_sock)
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if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
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continue;
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#if IS_ENABLED(CONFIG_IPV6)
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if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
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continue;
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#endif
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if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
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&dev->default_dst.remote_ip))
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@ -1021,16 +1032,16 @@ static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
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return false;
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}
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static void vxlan_sock_release(struct vxlan_dev *vxlan)
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static void __vxlan_sock_release(struct vxlan_sock *vs)
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{
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struct vxlan_sock *vs = vxlan->vn_sock;
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struct sock *sk = vs->sock->sk;
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struct net *net = sock_net(sk);
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struct vxlan_net *vn = net_generic(net, vxlan_net_id);
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struct vxlan_net *vn;
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if (!vs)
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return;
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if (!atomic_dec_and_test(&vs->refcnt))
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return;
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vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
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spin_lock(&vn->sock_lock);
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hlist_del_rcu(&vs->hlist);
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vxlan_notify_del_rx_port(vs);
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@ -1039,32 +1050,43 @@ static void vxlan_sock_release(struct vxlan_dev *vxlan)
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queue_work(vxlan_wq, &vs->del_work);
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}
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static void vxlan_sock_release(struct vxlan_dev *vxlan)
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{
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__vxlan_sock_release(vxlan->vn4_sock);
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#if IS_ENABLED(CONFIG_IPV6)
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__vxlan_sock_release(vxlan->vn6_sock);
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#endif
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}
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/* Update multicast group membership when first VNI on
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* multicast address is brought up
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*/
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static int vxlan_igmp_join(struct vxlan_dev *vxlan)
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{
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struct vxlan_sock *vs = vxlan->vn_sock;
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struct sock *sk = vs->sock->sk;
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struct sock *sk;
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union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
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int ifindex = vxlan->default_dst.remote_ifindex;
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int ret = -EINVAL;
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lock_sock(sk);
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if (ip->sa.sa_family == AF_INET) {
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struct ip_mreqn mreq = {
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.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
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.imr_ifindex = ifindex,
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};
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sk = vxlan->vn4_sock->sock->sk;
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lock_sock(sk);
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ret = ip_mc_join_group(sk, &mreq);
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release_sock(sk);
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#if IS_ENABLED(CONFIG_IPV6)
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} else {
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sk = vxlan->vn6_sock->sock->sk;
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lock_sock(sk);
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ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
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&ip->sin6.sin6_addr);
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release_sock(sk);
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#endif
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}
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release_sock(sk);
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return ret;
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}
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@ -1072,27 +1094,30 @@ static int vxlan_igmp_join(struct vxlan_dev *vxlan)
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/* Inverse of vxlan_igmp_join when last VNI is brought down */
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static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
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{
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struct vxlan_sock *vs = vxlan->vn_sock;
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struct sock *sk = vs->sock->sk;
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struct sock *sk;
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union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
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int ifindex = vxlan->default_dst.remote_ifindex;
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int ret = -EINVAL;
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lock_sock(sk);
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if (ip->sa.sa_family == AF_INET) {
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struct ip_mreqn mreq = {
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.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
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.imr_ifindex = ifindex,
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};
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sk = vxlan->vn4_sock->sock->sk;
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lock_sock(sk);
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ret = ip_mc_leave_group(sk, &mreq);
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release_sock(sk);
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#if IS_ENABLED(CONFIG_IPV6)
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} else {
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sk = vxlan->vn6_sock->sock->sk;
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lock_sock(sk);
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ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
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&ip->sin6.sin6_addr);
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release_sock(sk);
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#endif
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}
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release_sock(sk);
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return ret;
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}
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@ -1873,8 +1898,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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{
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struct ip_tunnel_info *info;
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struct vxlan_dev *vxlan = netdev_priv(dev);
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struct sock *sk = vxlan->vn_sock->sock->sk;
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unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
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struct sock *sk;
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struct rtable *rt = NULL;
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const struct iphdr *old_iph;
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struct flowi4 fl4;
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@ -1901,13 +1925,10 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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dev->name);
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goto drop;
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}
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if (family != ip_tunnel_info_af(info))
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goto drop;
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dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
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vni = be64_to_cpu(info->key.tun_id);
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remote_ip.sa.sa_family = family;
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if (family == AF_INET)
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remote_ip.sa.sa_family = ip_tunnel_info_af(info);
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if (remote_ip.sa.sa_family == AF_INET)
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remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
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else
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remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
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@ -1952,6 +1973,10 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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}
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if (dst->sa.sa_family == AF_INET) {
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if (!vxlan->vn4_sock)
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goto drop;
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sk = vxlan->vn4_sock->sock->sk;
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if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
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df = htons(IP_DF);
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@ -2013,6 +2038,10 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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struct flowi6 fl6;
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u32 rt6i_flags;
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if (!vxlan->vn6_sock)
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goto drop;
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sk = vxlan->vn6_sock->sock->sk;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
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fl6.daddr = dst->sin6.sin6_addr;
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@ -2204,7 +2233,6 @@ static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
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struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
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__u32 vni = vxlan->default_dst.remote_vni;
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vxlan->vn_sock = vs;
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spin_lock(&vn->sock_lock);
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hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
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spin_unlock(&vn->sock_lock);
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@ -2535,14 +2563,13 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
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}
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/* Create new listen socket if needed */
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static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
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u32 flags)
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static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
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__be16 port, u32 flags)
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{
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struct vxlan_net *vn = net_generic(net, vxlan_net_id);
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struct vxlan_sock *vs;
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struct socket *sock;
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unsigned int h;
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bool ipv6 = !!(flags & VXLAN_F_IPV6);
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struct udp_tunnel_sock_cfg tunnel_cfg;
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vs = kzalloc(sizeof(*vs), GFP_KERNEL);
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@ -2587,11 +2614,10 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
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return vs;
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}
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static int vxlan_sock_add(struct vxlan_dev *vxlan)
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static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
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{
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struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
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struct vxlan_sock *vs = NULL;
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bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
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if (!vxlan->cfg.no_share) {
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spin_lock(&vn->sock_lock);
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@ -2604,20 +2630,46 @@ static int vxlan_sock_add(struct vxlan_dev *vxlan)
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spin_unlock(&vn->sock_lock);
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}
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if (!vs)
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vs = vxlan_socket_create(vxlan->net, vxlan->cfg.dst_port,
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vxlan->flags);
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vs = vxlan_socket_create(vxlan->net, ipv6,
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vxlan->cfg.dst_port, vxlan->flags);
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if (IS_ERR(vs))
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return PTR_ERR(vs);
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#if IS_ENABLED(CONFIG_IPV6)
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if (ipv6)
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vxlan->vn6_sock = vs;
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else
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#endif
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vxlan->vn4_sock = vs;
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vxlan_vs_add_dev(vs, vxlan);
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return 0;
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}
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static int vxlan_sock_add(struct vxlan_dev *vxlan)
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{
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bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
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bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
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int ret = 0;
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vxlan->vn4_sock = NULL;
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#if IS_ENABLED(CONFIG_IPV6)
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vxlan->vn6_sock = NULL;
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if (ipv6 || metadata)
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ret = __vxlan_sock_add(vxlan, true);
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#endif
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if (!ret && (!ipv6 || metadata))
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ret = __vxlan_sock_add(vxlan, false);
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if (ret < 0)
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vxlan_sock_release(vxlan);
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return ret;
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}
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static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
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struct vxlan_config *conf)
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{
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struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
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struct vxlan_dev *vxlan = netdev_priv(dev);
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struct vxlan_rdst *dst = &vxlan->default_dst;
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unsigned short needed_headroom = ETH_HLEN;
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int err;
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bool use_ipv6 = false;
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__be16 default_port = vxlan->cfg.dst_port;
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@ -2637,6 +2689,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
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if (!IS_ENABLED(CONFIG_IPV6))
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return -EPFNOSUPPORT;
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use_ipv6 = true;
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vxlan->flags |= VXLAN_F_IPV6;
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}
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if (conf->remote_ifindex) {
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@ -2657,22 +2710,21 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
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pr_info("IPv6 is disabled via sysctl\n");
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return -EPERM;
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}
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vxlan->flags |= VXLAN_F_IPV6;
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}
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#endif
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if (!conf->mtu)
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dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
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dev->needed_headroom = lowerdev->hard_header_len +
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(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
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} else if (use_ipv6) {
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vxlan->flags |= VXLAN_F_IPV6;
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dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
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} else {
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dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
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needed_headroom = lowerdev->hard_header_len;
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}
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if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
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needed_headroom += VXLAN6_HEADROOM;
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else
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needed_headroom += VXLAN_HEADROOM;
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dev->needed_headroom = needed_headroom;
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memcpy(&vxlan->cfg, conf, sizeof(*conf));
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if (!vxlan->cfg.dst_port)
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vxlan->cfg.dst_port = default_port;
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@ -152,7 +152,10 @@ struct vxlan_config {
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struct vxlan_dev {
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struct hlist_node hlist; /* vni hash table */
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struct list_head next; /* vxlan's per namespace list */
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struct vxlan_sock *vn_sock; /* listening socket */
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struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */
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#if IS_ENABLED(CONFIG_IPV6)
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struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */
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#endif
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struct net_device *dev;
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struct net *net; /* netns for packet i/o */
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struct vxlan_rdst default_dst; /* default destination */
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@ -195,9 +198,14 @@ struct vxlan_dev {
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struct net_device *vxlan_dev_create(struct net *net, const char *name,
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u8 name_assign_type, struct vxlan_config *conf);
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static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan)
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static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan,
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unsigned short family)
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{
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return inet_sk(vxlan->vn_sock->sock->sk)->inet_sport;
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#if IS_ENABLED(CONFIG_IPV6)
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if (family == AF_INET6)
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return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport;
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#endif
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return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport;
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}
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static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
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@ -151,7 +151,8 @@ static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
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{
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struct vxlan_dev *vxlan = netdev_priv(vport->dev);
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struct net *net = ovs_dp_get_net(vport->dp);
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__be16 dst_port = vxlan_dev_dst_port(vxlan);
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unsigned short family = ip_tunnel_info_af(upcall->egress_tun_info);
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__be16 dst_port = vxlan_dev_dst_port(vxlan, family);
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__be16 src_port;
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int port_min;
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int port_max;
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