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| author | Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | 2015-05-21 10:57:12 -0300 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-06-12 14:06:24 +0200 |
| commit | 779668450a990d402d316ffd9b7b103fbe5ab6f3 (patch) | |
| tree | a9967d17f449a2f28f9dd2afec488e1160e3a49a /net | |
| parent | c63264def3393dd123bfa630a7a46b5d6d2d6038 (diff) | |
| download | linux-779668450a990d402d316ffd9b7b103fbe5ab6f3.tar.gz linux-779668450a990d402d316ffd9b7b103fbe5ab6f3.tar.bz2 linux-779668450a990d402d316ffd9b7b103fbe5ab6f3.zip | |
netfilter: conntrack: warn the user if there is a better helper to use
After db29a9508a92 ("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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_generic.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c index 60865f110309..2281be419a74 100644 --- a/net/netfilter/nf_conntrack_proto_generic.c +++ b/net/netfilter/nf_conntrack_proto_generic.c @@ -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) |