From ce44a4aea5e4203147013759a363c17b2ee5132b Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Mon, 19 Jun 2017 10:03:57 +0200 Subject: [PATCH] vxlan: improve validation of address family configuration Address families of source and destination addresses must match, and changelink operations can't change the address family. In addition, always use the VXLAN_F_IPV6 to check if a VXLAN device uses IPv4 or IPv6. Signed-off-by: Matthias Schiffer Signed-off-by: David S. Miller --- drivers/net/vxlan.c | 39 ++++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index b4fce3b29647..00680cc597ac 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2484,10 +2484,7 @@ static int vxlan_change_mtu(struct net_device *dev, int new_mtu) struct vxlan_rdst *dst = &vxlan->default_dst; struct net_device *lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex); - bool use_ipv6 = false; - - if (dst->remote_ip.sa.sa_family == AF_INET6) - use_ipv6 = true; + 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 @@ -2897,11 +2894,20 @@ static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, } } - if (!conf->remote_ip.sa.sa_family) + 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) + return -EINVAL; - if (conf->remote_ip.sa.sa_family == AF_INET6 || - conf->saddr.sa.sa_family == AF_INET6) { + if (conf->saddr.sa.sa_family == AF_INET6) { if (!IS_ENABLED(CONFIG_IPV6)) return -EPFNOSUPPORT; use_ipv6 = true; @@ -2949,11 +2955,9 @@ static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, continue; if (tmp->cfg.vni == conf->vni && - (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 || - tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 && tmp->cfg.dst_port == conf->dst_port && - (tmp->cfg.flags & VXLAN_F_RCV_FLAGS) == - (conf->flags & VXLAN_F_RCV_FLAGS)) + (tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) == + (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) return -EEXIST; } @@ -3084,22 +3088,35 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], } if (data[IFLA_VXLAN_GROUP]) { + if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) + 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)) return -EPFNOSUPPORT; + if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) + 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)) + 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)) return -EPFNOSUPPORT; + if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) + 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; -- 2.20.1