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netfilter: physdev: physdev-is-out should not work with OUTPUT chain 

physdev_mt() will check skb->nf_bridge first, which was alloced in
br_nf_pre_routing. So if we want to use --physdev-out and physdev-is-out,
we need to match it in FORWARD or POSTROUTING chain. physdev_mt_check()
only checked physdev-out and missed physdev-is-out. Fix it and update the
debug message to make it clearer.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Marcelo R Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Hangbin Liu 2016-07-05 20:55:36 +08:00 committed by Pablo Neira Ayuso
parent 870190a9ec
commit 47c7445625
1 changed files with 4 additions and 4 deletions
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8
net/netfilter/xt_physdev.c
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@ -102,14 +102,14 @@ static int physdev_mt_check(const struct xt_mtchk_param *par)
if (!(info->bitmask & XT_PHYSDEV_OP_MASK) ||
info->bitmask & ~XT_PHYSDEV_OP_MASK)
return -EINVAL;
if (info->bitmask & XT_PHYSDEV_OP_OUT &&
if (info->bitmask & (XT_PHYSDEV_OP_OUT | XT_PHYSDEV_OP_ISOUT) &&
(!(info->bitmask & XT_PHYSDEV_OP_BRIDGED) ||
info->invert & XT_PHYSDEV_OP_BRIDGED) &&
par->hook_mask & ((1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) | (1 << NF_INET_POST_ROUTING))) {
pr_info("using --physdev-out in the OUTPUT, FORWARD and "
"POSTROUTING chains for non-bridged traffic is not "
"supported anymore.\n");
pr_info("using --physdev-out and --physdev-is-out are only"
"supported in the FORWARD and POSTROUTING chains with"
"bridged traffic.\n");
if (par->hook_mask & (1 << NF_INET_LOCAL_OUT))
return -EINVAL;
}