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netfilter: ipt_LOG/ip6t_LOG: add option to print decoded MAC header

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The LOG targets print the entire MAC header as one long string, which is not
readable very well:

IN=eth0 OUT= MAC=00:15:f2:24:91:f8:00:1b:24:dc:61:e6:08:00 ...

Add an option to decode known header formats (currently just ARPHRD_ETHER devices)
in their individual fields:

IN=eth0 OUT= MACSRC=00:1b:24:dc:61:e6 MACDST=00:15:f2:24:91:f8 MACPROTO=0800 ...
IN=eth0 OUT= MACSRC=00:1b:24:dc:61:e6 MACDST=00:15:f2:24:91:f8 MACPROTO=86dd ...

The option needs to be explicitly enabled by userspace to avoid breaking
existing parsers.

Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Patrick McHardy 2010-06-28 14:16:08 +02:00
commit 7eb9282cd0
4 changed files with 97 additions and 44 deletions
Download patch file Download diff file Expand all files Collapse all files

54
net/ipv4/netfilter/ipt_LOG.c
View file

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
@ -363,6 +364,42 @@ static void dump_packet(const struct nf_loginfo *info,
/* maxlen = 230+ 91 + 230 + 252 = 803 */
}
static void dump_mac_header(const struct nf_loginfo *info,
const struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
unsigned int logflags = 0;
if (info->type == NF_LOG_TYPE_LOG)
logflags = info->u.log.logflags;
if (!(logflags & IPT_LOG_MACDECODE))
goto fallback;
switch (dev->type) {
case ARPHRD_ETHER:
printk("MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
ntohs(eth_hdr(skb)->h_proto));
return;
default:
break;
}
fallback:
printk("MAC=");
if (dev->hard_header_len &&
skb->mac_header != skb->network_header) {
const unsigned char *p = skb_mac_header(skb);
unsigned int i;
printk("%02x", *p++);
for (i = 1; i < dev->hard_header_len; i++, p++)
printk(":%02x", *p);
}
printk(" ");
}
static struct nf_loginfo default_loginfo = {
.type = NF_LOG_TYPE_LOG,
.u = {
@ -404,20 +441,9 @@ ipt_log_packet(u_int8_t pf,
}
#endif
if (in && !out) {
/* MAC logging for input chain only. */
printk("MAC=");
if (skb->dev && skb->dev->hard_header_len &&
skb->mac_header != skb->network_header) {
int i;
const unsigned char *p = skb_mac_header(skb);
printk("%02x", *p++);
for (i = 1; i < skb->dev->hard_header_len; i++, p++)
printk(":%02x", *p);
}
printk(" ");
}
/* MAC logging for input path only. */
if (in && !out)
dump_mac_header(loginfo, skb);
dump_packet(loginfo, skb, 0);
printk("\n");