lkml.org 
[lkml]   [2016]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3.19.y-ckt 188/210] vxlan: fix test which detect duplicate vxlan iface
    Date
    3.19.8-ckt14 -stable review patch.  If anyone has any objections, please let me know.

    ---8<------------------------------------------------------------

    From: Nicolas Dichtel <nicolas.dichtel@6wind.com>

    [ Upstream commit 07b9b37c227cb8d88d478b4a9c5634fee514ede1 ]

    When a vxlan interface is created, the driver checks that there is not
    another vxlan interface with the same properties. To do this, it checks
    the existing vxlan udp socket. Since commit 1c51a9159dde, the creation of
    the vxlan socket is done only when the interface is set up, thus it breaks
    that test.

    Example:
    $ ip l a vxlan10 type vxlan id 10 group 239.0.0.10 dev eth0 dstport 0
    $ ip l a vxlan11 type vxlan id 10 group 239.0.0.10 dev eth0 dstport 0
    $ ip -br l | grep vxlan
    vxlan10 DOWN f2:55:1c:6a:fb:00 <BROADCAST,MULTICAST>
    vxlan11 DOWN 7a:cb:b9:38:59:0d <BROADCAST,MULTICAST>

    Instead of checking sockets, let's loop over the vxlan iface list.

    Fixes: 1c51a9159dde ("vxlan: fix race caused by dropping rtnl_unlock")
    Reported-by: Thomas Faivre <thomas.faivre@6wind.com>
    Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/net/vxlan.c | 12 ++++++++----
    include/net/vxlan.h | 5 +++++
    2 files changed, 13 insertions(+), 4 deletions(-)

    diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
    index d1494f7..3f97a9f 100644
    --- a/drivers/net/vxlan.c
    +++ b/drivers/net/vxlan.c
    @@ -2432,7 +2432,7 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
    struct nlattr *tb[], struct nlattr *data[])
    {
    struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
    - struct vxlan_dev *vxlan = netdev_priv(dev);
    + struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
    struct vxlan_rdst *dst = &vxlan->default_dst;
    __u32 vni;
    int err;
    @@ -2557,9 +2557,13 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
    nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
    vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;

    - if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
    - vxlan->dst_port)) {
    - pr_info("duplicate VNI %u\n", vni);
    + list_for_each_entry(tmp, &vn->vxlan_list, next) {
    + if (tmp->default_dst.remote_vni == vni &&
    + (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
    + tmp->saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
    + tmp->dst_port == vxlan->dst_port &&
    + (tmp->flags & VXLAN_F_RCV_FLAGS) ==
    + (vxlan->flags & VXLAN_F_RCV_FLAGS))
    return -EEXIST;
    }

    diff --git a/include/net/vxlan.h b/include/net/vxlan.h
    index 903461a..2f3572f 100644
    --- a/include/net/vxlan.h
    +++ b/include/net/vxlan.h
    @@ -43,6 +43,11 @@ struct vxlan_sock {
    #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
    #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100

    +/* Flags that are used in the receive path. These flags must match in
    + * order for a socket to be shareable
    + */
    +#define VXLAN_F_RCV_FLAGS VXLAN_F_UDP_ZERO_CSUM6_RX
    +
    struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
    vxlan_rcv_t *rcv, void *data,
    bool no_share, u32 flags);
    --
    1.9.1
    \
     
     \ /
      Last update: 2016-01-29 03:01    [W:3.695 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site