Le vendredi 19 février 2010 à 08:06 +0100, Patrick McHardy a écrit :
> Stephen Hemminger wrote:
> > On Fri, 19 Feb 2010 06:45:43 +0100
> > Patrick McHardy <kaber@xxxxxxxxx> wrote:
> >
> >> Stephen Hemminger wrote:
> >>> Something in net-next tree broke bridging of virtual nets.
> >>> My local VM's can no longer access external networks.
> >>>
> >>> It is a NAT problem. One of the recent netfilter changes is causing
> >>> the packets to not have there source address rewritten.
> >>>
> >>> I see:
> >>> VM1 -- 192.168.100.0/24 -- HOST -- 192.168.1.0/24 -- ROUTER
> >>> virbr0 eth0
> >>>
> >>> Even a simple ping from VM1 doesn't get responded to because
> >>> the 192.168.100.X source address is not getting rewritten.
> >> I'll try to reproduce it locally. What is the HEAD of the broken
> >> tree you're running?
> >
> > commit 37ee3d5b3e979a168536e7e2f15bd1e769cb4122
> > Author: Patrick McHardy <kaber@xxxxxxxxx>
> > Date: Thu Feb 18 19:04:44 2010 +0100
> >
> > netfilter: nf_defrag_ipv4: fix compilation error with NF_CONNTRACK=n
>
> This patch should fix it.
>
> pièce jointe document texte brut (x)
> commit 4bac6b180771f7ef5275b1a6d88e630ca3a3d6f0
> Author: Patrick McHardy <kaber@xxxxxxxxx>
> Date: Fri Feb 19 08:03:28 2010 +0100
>
> netfilter: restore POST_ROUTING hook in NF_HOOK_COND
>
> Commit 2249065 ("netfilter: get rid of the grossness in netfilter.h")
> inverted the logic for conditional hook invocation, breaking the
> POST_ROUTING hook invoked by ip_output().
>
> Correct the logic and remove an unnecessary initialization.
>
> Reported-by: Stephen Hemminger <shemminger@xxxxxxxxxx>
> Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
>
> diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
> index 7007945..89341c3 100644
> --- a/include/linux/netfilter.h
> +++ b/include/linux/netfilter.h
> @@ -212,8 +212,9 @@ NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
> struct net_device *in, struct net_device *out,
> int (*okfn)(struct sk_buff *), bool cond)
> {
> - int ret = 1;
> - if (cond ||
> + int ret;
> +
> + if (!cond ||
> (ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN) == 1))
> ret = okfn(skb);
> return ret;
I dont quite get it
Original code was :
#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
({int __ret; \
if ((cond) || (__ret = nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN)) == 1)\
__ret = (okfn)(skb); \
__ret;})
There was no condition inversion.
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