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    SubjectRe: 答复: 答复: 答复: [PATCH] set fake_rtable's dst to NULL to avoid kernel Oops.
    On Sat, 2012-03-31 at 09:26 +0800, Peter Huang (Peng) wrote:
    > > > >Check net/bridge/br_netfilter.c and commits e688a6048076 (net: introduce
    > > > >DST_NOPEER dst flag ) 4adf0af6818f3ea5 (bridge: send correct MTU value
    > > > >in PMTU (revised))
    > Hi, Eric
    > I confirmed the patch contents again.
    > For our case, NF_INET_PRE_ROUTING is involved, not NF_BR_LOCAL_IN.
    > It seems pre-routing is not included in the patch you mentioned.
    > BTW, our pkts are all ipv6 DHCP pkts(with MAC 33 33 00 01 00 02).
    > We verified the patch bellow, and this works fine, no WARN_ON happened.

    Hi Peter

    I claim that your patch is not the good one and you need to refine it.

    First, code is not needed if CONFIG_BRIDGE_NETFILTER is not set.

    In fact, if CONFIG_BRIDGE_NETFILTER is not set, compilation will fail
    since fake_rtable doesnt exist in "struct net_bridge", so you fix a bug
    and introduce a new one.

    CC [M] net/bridge/br_forward.o
    net/bridge/br_forward.c: In function ‘__br_forward’:
    net/bridge/br_forward.c:94: error: ‘struct sk_buff’ has no member named ‘_skb_dst’
    net/bridge/br_forward.c:94: error: ‘struct net_bridge’ has no member named ‘fake_rtable’
    make[1]: *** [net/bridge/br_forward.o] Error 1
    make: *** [_module_net/bridge] Error 2

    Then, the test is using obsolete dst internals and cast that should not
    be in a C file. :

    if (skb->_skb_dst == (unsigned long)&to->br->fake_rtable)

    So I suggested you take a look at net/bridge/br_netfilter.c code to see
    how this can be done properly. Maybe you need to add a helper in an
    include file to make this proper.

    I hope this is now clear to you, because your initial patch cannot be
    applied as is. If you want full credit for this work, you must go a step
    forward, or else another guy will finish the job.


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