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netfilter: conntrack: warn the user if there is a better helper to use

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After db29a9508a ("netfilter: conntrack: disable generic tracking for
known protocols"), if the specific helper is built but not loaded
(a standard for most distributions) systems with a restrictive firewall
but weak configuration regarding netfilter modules to load, will
silently stop working.

This patch then puts a warning message so the sysadmin knows where to
start looking into. It's a pr_warn_once regardless of protocol itself
but it should be enough to give a hint on where to look.

Cc: Florian Westphal <fw@strlen.de>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Marcelo Ricardo Leitner 2015-05-21 10:57:12 -03:00 committed by Pablo Neira Ayuso
parent c63264def3
commit 779668450a
1 changed files with 7 additions and 1 deletions
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8
net/netfilter/nf_conntrack_proto_generic.c
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@ -90,7 +90,13 @@ static int generic_packet(struct nf_conn *ct,
static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
unsigned int dataoff, unsigned int *timeouts)
{
return nf_generic_should_process(nf_ct_protonum(ct));
bool ret;
ret = nf_generic_should_process(nf_ct_protonum(ct));
if (!ret)
pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n",
nf_ct_protonum(ct));
return ret;
}
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)