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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 <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2009-08-25 15:33:08 +02:00
parent f3abc9b963
commit 74f7a6552c
2 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View File

@ -26,6 +26,7 @@
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
#include <net/netfilter/nf_log.h>
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;

6
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View File

@ -27,6 +27,7 @@
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
#include <net/netfilter/nf_log.h>
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);