• Nicolas Dichtel's avatar
    vti6: flush x-netns xfrm cache when vti interface is removed · 7f92083e
    Nicolas Dichtel authored
    This is the same fix than commit a5d0dc81 ("vti: flush x-netns xfrm
    cache when vti interface is removed")
    
    This patch fixes a refcnt problem when a x-netns vti6 interface is removed:
    unregister_netdevice: waiting for vti6_test to become free. Usage count = 1
    
    Here is a script to reproduce the problem:
    
    ip link set dev ntfp2 up
    ip addr add dev ntfp2 2001::1/64
    ip link add vti6_test type vti6 local 2001::1 remote 2001::2 key 1
    ip netns add secure
    ip link set vti6_test netns secure
    ip netns exec secure ip link set vti6_test up
    ip netns exec secure ip link s lo up
    ip netns exec secure ip addr add dev vti6_test 2003::1/64
    ip -6 xfrm policy add dir out tmpl src 2001::1 dst 2001::2 proto esp \
    	   mode tunnel mark 1
    ip -6 xfrm policy add dir in tmpl src 2001::2 dst 2001::1 proto esp \
    	   mode tunnel mark 1
    ip xfrm state add src 2001::1 dst 2001::2 proto esp spi 1 mode tunnel \
    	   enc des3_ede 0x112233445566778811223344556677881122334455667788 mark 1
    ip xfrm state add src 2001::2 dst 2001::1 proto esp spi 1 mode tunnel \
    	   enc des3_ede 0x112233445566778811223344556677881122334455667788 mark 1
    ip netns exec secure  ping6 -c 4 2003::2
    ip netns del secure
    
    CC: Lance Richardson <lrichard@redhat.com>
    Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
    Acked-by: default avatarLance Richardson <lrichard@redhat.com>
    Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
    7f92083e
ip6_vti.c 28.8 KB