273 lines
6.6 KiB
C
273 lines
6.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Vxlan multicast group handling
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*
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*/
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#include <linux/kernel.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <linux/igmp.h>
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#include <net/vxlan.h>
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#include "vxlan_private.h"
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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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int vxlan_igmp_join(struct vxlan_dev *vxlan, union vxlan_addr *rip,
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int rifindex)
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{
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union vxlan_addr *ip = (rip ? : &vxlan->default_dst.remote_ip);
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int ifindex = (rifindex ? : vxlan->default_dst.remote_ifindex);
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int ret = -EINVAL;
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struct sock *sk;
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if (ip->sa.sa_family == AF_INET) {
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struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
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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 = sock4->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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struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
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sk = sock6->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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return ret;
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}
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int vxlan_igmp_leave(struct vxlan_dev *vxlan, union vxlan_addr *rip,
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int rifindex)
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{
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union vxlan_addr *ip = (rip ? : &vxlan->default_dst.remote_ip);
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int ifindex = (rifindex ? : vxlan->default_dst.remote_ifindex);
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int ret = -EINVAL;
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struct sock *sk;
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if (ip->sa.sa_family == AF_INET) {
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struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
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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 = sock4->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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struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
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sk = sock6->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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return ret;
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}
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static bool vxlan_group_used_match(union vxlan_addr *ip, int ifindex,
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union vxlan_addr *rip, int rifindex)
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{
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if (!vxlan_addr_multicast(rip))
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return false;
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if (!vxlan_addr_equal(rip, ip))
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return false;
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if (rifindex != ifindex)
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return false;
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return true;
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}
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static bool vxlan_group_used_by_vnifilter(struct vxlan_dev *vxlan,
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union vxlan_addr *ip, int ifindex)
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{
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struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
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struct vxlan_vni_node *v, *tmp;
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if (vxlan_group_used_match(ip, ifindex,
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&vxlan->default_dst.remote_ip,
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vxlan->default_dst.remote_ifindex))
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return true;
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list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
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if (!vxlan_addr_multicast(&v->remote_ip))
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continue;
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if (vxlan_group_used_match(ip, ifindex,
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&v->remote_ip,
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vxlan->default_dst.remote_ifindex))
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return true;
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}
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return false;
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}
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/* See if multicast group is already in use by other ID */
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bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev,
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__be32 vni, union vxlan_addr *rip, int rifindex)
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{
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union vxlan_addr *ip = (rip ? : &dev->default_dst.remote_ip);
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int ifindex = (rifindex ? : dev->default_dst.remote_ifindex);
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struct vxlan_dev *vxlan;
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struct vxlan_sock *sock4;
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#if IS_ENABLED(CONFIG_IPV6)
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struct vxlan_sock *sock6;
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#endif
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unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
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sock4 = rtnl_dereference(dev->vn4_sock);
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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 (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
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return false;
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#if IS_ENABLED(CONFIG_IPV6)
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sock6 = rtnl_dereference(dev->vn6_sock);
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if (family == AF_INET6 && sock6 && refcount_read(&sock6->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 (family == AF_INET &&
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rtnl_dereference(vxlan->vn4_sock) != sock4)
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continue;
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#if IS_ENABLED(CONFIG_IPV6)
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if (family == AF_INET6 &&
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rtnl_dereference(vxlan->vn6_sock) != sock6)
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continue;
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#endif
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if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
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if (!vxlan_group_used_by_vnifilter(vxlan, ip, ifindex))
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continue;
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} else {
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if (!vxlan_group_used_match(ip, ifindex,
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&vxlan->default_dst.remote_ip,
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vxlan->default_dst.remote_ifindex))
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continue;
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}
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return true;
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}
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return false;
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}
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static int vxlan_multicast_join_vnigrp(struct vxlan_dev *vxlan)
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{
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struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
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struct vxlan_vni_node *v, *tmp, *vgood = NULL;
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int ret = 0;
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list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
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if (!vxlan_addr_multicast(&v->remote_ip))
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continue;
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/* skip if address is same as default address */
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if (vxlan_addr_equal(&v->remote_ip,
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&vxlan->default_dst.remote_ip))
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continue;
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ret = vxlan_igmp_join(vxlan, &v->remote_ip, 0);
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if (ret == -EADDRINUSE)
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ret = 0;
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if (ret)
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goto out;
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vgood = v;
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}
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out:
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if (ret) {
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list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
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if (!vxlan_addr_multicast(&v->remote_ip))
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continue;
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if (vxlan_addr_equal(&v->remote_ip,
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&vxlan->default_dst.remote_ip))
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continue;
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vxlan_igmp_leave(vxlan, &v->remote_ip, 0);
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if (v == vgood)
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break;
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}
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}
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return ret;
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}
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static int vxlan_multicast_leave_vnigrp(struct vxlan_dev *vxlan)
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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_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
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struct vxlan_vni_node *v, *tmp;
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int last_err = 0, ret;
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list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
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if (vxlan_addr_multicast(&v->remote_ip) &&
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!vxlan_group_used(vn, vxlan, v->vni, &v->remote_ip,
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0)) {
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ret = vxlan_igmp_leave(vxlan, &v->remote_ip, 0);
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if (ret)
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last_err = ret;
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}
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}
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return last_err;
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}
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int vxlan_multicast_join(struct vxlan_dev *vxlan)
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{
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int ret = 0;
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if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
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ret = vxlan_igmp_join(vxlan, &vxlan->default_dst.remote_ip,
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vxlan->default_dst.remote_ifindex);
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if (ret == -EADDRINUSE)
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ret = 0;
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if (ret)
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return ret;
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}
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if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
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return vxlan_multicast_join_vnigrp(vxlan);
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return 0;
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}
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int vxlan_multicast_leave(struct vxlan_dev *vxlan)
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{
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struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
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int ret = 0;
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if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
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!vxlan_group_used(vn, vxlan, 0, NULL, 0)) {
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ret = vxlan_igmp_leave(vxlan, &vxlan->default_dst.remote_ip,
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vxlan->default_dst.remote_ifindex);
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if (ret)
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return ret;
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}
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if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
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return vxlan_multicast_leave_vnigrp(vxlan);
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return 0;
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}
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