From 74f7a6552c8d76ffc5e11eb8d9d6c07238b9ae77 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Tue, 25 Aug 2009 15:33:08 +0200 Subject: [PATCH] netfilter: nf_conntrack: log packets dropped by helpers Log packets dropped by helpers using the netfilter logging API. This is useful in combination with nfnetlink_log to analyze those packets in userspace for debugging. Signed-off-by: Patrick McHardy --- net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 6 +++++- net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c | 6 +++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index 9ac2fdc..aa95bb8 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -26,6 +26,7 @@ #include #include #include +#include int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, struct nf_conn *ct, @@ -113,8 +114,11 @@ static unsigned int ipv4_confirm(unsigned int hooknum, ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), ct, ctinfo); - if (ret != NF_ACCEPT) + if (ret != NF_ACCEPT) { + nf_log_packet(NFPROTO_IPV4, hooknum, skb, in, out, NULL, + "nf_ct_%s: dropping packet", helper->name); return ret; + } if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) { typeof(nf_nat_seq_adjust_hook) seq_adjust; diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c index a7f4cd6..5f2ec20 100644 --- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c +++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c @@ -27,6 +27,7 @@ #include #include #include +#include static bool ipv6_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, struct nf_conntrack_tuple *tuple) @@ -176,8 +177,11 @@ static unsigned int ipv6_confirm(unsigned int hooknum, } ret = helper->help(skb, protoff, ct, ctinfo); - if (ret != NF_ACCEPT) + if (ret != NF_ACCEPT) { + nf_log_packet(NFPROTO_IPV6, hooknum, skb, in, out, NULL, + "nf_ct_%s: dropping packet", helper->name); return ret; + } out: /* We've seen it coming out the other side: confirm it */ return nf_conntrack_confirm(skb); -- 1.8.2.3