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// SPDX-License-Identifier: GPL-2.0-only
/*
* Vxlan multicast group handling
*
*/
#include <linux/kernel.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <linux/igmp.h>
#include <net/vxlan.h>
#include "vxlan_private.h"
/* Update multicast group membership when first VNI on
* multicast address is brought up
*/
int vxlan_igmp_join(struct vxlan_dev *vxlan, union vxlan_addr *rip,
int rifindex)
{
union vxlan_addr *ip = (rip ? : &vxlan->default_dst.remote_ip);
int ifindex = (rifindex ? : vxlan->default_dst.remote_ifindex);
int ret = -EINVAL;
struct sock *sk;
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;
}
int vxlan_igmp_leave(struct vxlan_dev *vxlan, union vxlan_addr *rip,
int rifindex)
{
union vxlan_addr *ip = (rip ? : &vxlan->default_dst.remote_ip);
int ifindex = (rifindex ? : vxlan->default_dst.remote_ifindex);
int ret = -EINVAL;
struct sock *sk;
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_group_used_match(union vxlan_addr *ip, int ifindex,
union vxlan_addr *rip, int rifindex)
{
if (!vxlan_addr_multicast(rip))
return false;
if (!vxlan_addr_equal(rip, ip))
return false;
if (rifindex != ifindex)
return false;
return true;
}
static bool vxlan_group_used_by_vnifilter(struct vxlan_dev *vxlan,
union vxlan_addr *ip, int ifindex)
{
struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
struct vxlan_vni_node *v, *tmp;
if (vxlan_group_used_match(ip, ifindex,
&vxlan->default_dst.remote_ip,
vxlan->default_dst.remote_ifindex))
return true;
list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
if (!vxlan_addr_multicast(&v->remote_ip))
continue;
if (vxlan_group_used_match(ip, ifindex,
&v->remote_ip,
vxlan->default_dst.remote_ifindex))
return true;
}
return false;
}
/* See if multicast group is already in use by other ID */
bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev,
__be32 vni, union vxlan_addr *rip, int rifindex)
{
union vxlan_addr *ip = (rip ? : &dev->default_dst.remote_ip);
int ifindex = (rifindex ? : dev->default_dst.remote_ifindex);
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->cfg.flags & VXLAN_F_VNIFILTER) {
if (!vxlan_group_used_by_vnifilter(vxlan, ip, ifindex))
continue;
} else {
if (!vxlan_group_used_match(ip, ifindex,
&vxlan->default_dst.remote_ip,
vxlan->default_dst.remote_ifindex))
continue;
}
return true;
}
return false;
}
static int vxlan_multicast_join_vnigrp(struct vxlan_dev *vxlan)
{
struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
struct vxlan_vni_node *v, *tmp, *vgood = NULL;
int ret = 0;
list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
if (!vxlan_addr_multicast(&v->remote_ip))
continue;
/* skip if address is same as default address */
if (vxlan_addr_equal(&v->remote_ip,
&vxlan->default_dst.remote_ip))
continue;
ret = vxlan_igmp_join(vxlan, &v->remote_ip, 0);
if (ret == -EADDRINUSE)
ret = 0;
if (ret)
goto out;
vgood = v;
}
out:
if (ret) {
list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
if (!vxlan_addr_multicast(&v->remote_ip))
continue;
if (vxlan_addr_equal(&v->remote_ip,
&vxlan->default_dst.remote_ip))
continue;
vxlan_igmp_leave(vxlan, &v->remote_ip, 0);
if (v == vgood)
break;
}
}
return ret;
}
static int vxlan_multicast_leave_vnigrp(struct vxlan_dev *vxlan)
{
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp);
struct vxlan_vni_node *v, *tmp;
int last_err = 0, ret;
list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) {
if (vxlan_addr_multicast(&v->remote_ip) &&
!vxlan_group_used(vn, vxlan, v->vni, &v->remote_ip,
0)) {
ret = vxlan_igmp_leave(vxlan, &v->remote_ip, 0);
if (ret)
last_err = ret;
}
}
return last_err;
}
int vxlan_multicast_join(struct vxlan_dev *vxlan)
{
int ret = 0;
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
ret = vxlan_igmp_join(vxlan, &vxlan->default_dst.remote_ip,
vxlan->default_dst.remote_ifindex);
if (ret == -EADDRINUSE)
ret = 0;
if (ret)
return ret;
}
if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
return vxlan_multicast_join_vnigrp(vxlan);
return 0;
}
int vxlan_multicast_leave(struct vxlan_dev *vxlan)
{
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, 0, NULL, 0)) {
ret = vxlan_igmp_leave(vxlan, &vxlan->default_dst.remote_ip,
vxlan->default_dst.remote_ifindex);
if (ret)
return ret;
}
if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
return vxlan_multicast_leave_vnigrp(vxlan);
return 0;
}
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