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    net: fix bridge multicast packet checksum validation · 9b368814
    Linus Lüssing 提交于
    We need to update the skb->csum after pulling the skb, otherwise
    an unnecessary checksum (re)computation can ocure for IGMP/MLD packets
    in the bridge code. Additionally this fixes the following splats for
    network devices / bridge ports with support for and enabled RX checksum
    offloading:
    
    [...]
    [   43.986968] eth0: hw csum failure
    [   43.990344] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.4.0 #2
    [   43.996193] Hardware name: BCM2709
    [   43.999647] [<800204e0>] (unwind_backtrace) from [<8001cf14>] (show_stack+0x10/0x14)
    [   44.007432] [<8001cf14>] (show_stack) from [<801ab614>] (dump_stack+0x80/0x90)
    [   44.014695] [<801ab614>] (dump_stack) from [<802e4548>] (__skb_checksum_complete+0x6c/0xac)
    [   44.023090] [<802e4548>] (__skb_checksum_complete) from [<803a055c>] (ipv6_mc_validate_checksum+0x104/0x178)
    [   44.032959] [<803a055c>] (ipv6_mc_validate_checksum) from [<802e111c>] (skb_checksum_trimmed+0x130/0x188)
    [   44.042565] [<802e111c>] (skb_checksum_trimmed) from [<803a06e8>] (ipv6_mc_check_mld+0x118/0x338)
    [   44.051501] [<803a06e8>] (ipv6_mc_check_mld) from [<803b2c98>] (br_multicast_rcv+0x5dc/0xd00)
    [   44.060077] [<803b2c98>] (br_multicast_rcv) from [<803aa510>] (br_handle_frame_finish+0xac/0x51c)
    [...]
    
    Fixes: 9afd85c9 ("net: Export IGMP/MLD message validation code")
    Reported-by: NÁlvaro Fernández Rojas <noltari@gmail.com>
    Signed-off-by: NLinus Lüssing <linus.luessing@c0d3.blue>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    9b368814
skbuff.c 111.8 KB