From adab0dd4789936495bb2f0d6892ad26437ebb31e Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 2 Mar 2015 01:04:55 +0100
Subject: [PATCH] netfilter: restore rule tracing via nfnetlink_log
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Since fab4085 ("netfilter: log: nf_log_packet() as real unified
interface"), the loginfo structure that is passed to nf_log_packet()
is used to explicitly indicate the logger type you want to use.
This is a problem for people tracing rules through nfnetlink_log since
packets are always routed to the NF_LOG_TYPE logger after the
aforementioned patch.
We can fix this by removing the trace loginfo structures, but that still
changes the log level from 4 to 5 for tracing messages and there may be
someone relying on this outthere. So let's just introduce some compat
code to restore the former behaviour.
Reported-by: Markus Kötter <koetter@rrzn.uni-hannover.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 10 ++++++++++
net/ipv4/netfilter/ip_tables.c | 2 +-
net/ipv6/netfilter/ip6_tables.c | 2 +-
net/netfilter/nf_log.c | 25 +++++++++++++++++++++++++
net/netfilter/nf_tables_core.c | 2 +-
5 files changed, 38 insertions(+), 3 deletions(-)
@@ -79,6 +79,16 @@ void nf_log_packet(struct net *net,
const struct nf_loginfo *li,
const char *fmt, ...);
+__printf(8, 9)
+void nf_log_compat(struct net *net,
+ u_int8_t pf,
+ unsigned int hooknum,
+ const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct nf_loginfo *li,
+ const char *fmt, ...);
+
struct nf_log_buf;
struct nf_log_buf *nf_log_buf_open(void);
@@ -272,7 +272,7 @@ static void trace_packet(const struct sk_buff *skb,
&chainname, &comment, &rulenum) != 0)
break;
- nf_log_packet(net, AF_INET, hook, skb, in, out, &trace_loginfo,
+ nf_log_compat(net, AF_INET, hook, skb, in, out, &trace_loginfo,
"TRACE: %s:%s:%s:%u ",
tablename, chainname, comment, rulenum);
}
@@ -298,7 +298,7 @@ static void trace_packet(const struct sk_buff *skb,
&chainname, &comment, &rulenum) != 0)
break;
- nf_log_packet(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
+ nf_log_compat(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
"TRACE: %s:%s:%s:%u ",
tablename, chainname, comment, rulenum);
}
@@ -212,6 +212,31 @@ void nf_log_packet(struct net *net,
}
EXPORT_SYMBOL(nf_log_packet);
+void nf_log_compat(struct net *net,
+ u_int8_t pf,
+ unsigned int hooknum,
+ const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct nf_loginfo *loginfo, const char *fmt, ...)
+{
+ va_list args;
+ char prefix[NF_LOG_PREFIXLEN];
+ const struct nf_logger *logger;
+
+ rcu_read_lock();
+ logger = rcu_dereference(net->nf.nf_loggers[pf]);
+
+ if (logger) {
+ va_start(args, fmt);
+ vsnprintf(prefix, sizeof(prefix), fmt, args);
+ va_end(args);
+ logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(nf_log_compat);
+
#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
struct nf_log_buf {
@@ -94,7 +94,7 @@ static void nft_trace_packet(const struct nft_pktinfo *pkt,
{
struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);
- nf_log_packet(net, pkt->xt.family, pkt->ops->hooknum, pkt->skb, pkt->in,
+ nf_log_compat(net, pkt->xt.family, pkt->ops->hooknum, pkt->skb, pkt->in,
pkt->out, &trace_loginfo, "TRACE: %s:%s:%s:%u ",
chain->table->name, chain->name, comments[type],
rulenum);
--
1.7.10.4