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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 <kaber@trash.net>
This commit is contained in:
Patrick McHardy
2010-06-28 14:16:08 +02:00
parent cf377eb4ae
commit 7eb9282cd0
4 changed files with 97 additions and 44 deletions
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3
include/linux/netfilter_ipv4/ipt_LOG.h
View File

@@ -7,7 +7,8 @@
#define IPT_LOG_IPOPT 0x04 /* Log IP options */
#define IPT_LOG_UID 0x08 /* Log UID owning local socket */
#define IPT_LOG_NFLOG 0x10 /* Unsupported, don't reuse */
#define IPT_LOG_MASK 0x1f
#define IPT_LOG_MACDECODE 0x20 /* Decode MAC header */
#define IPT_LOG_MASK 0x2f
struct ipt_log_info {
unsigned char level;

3
include/linux/netfilter_ipv6/ip6t_LOG.h
View File

@@ -7,7 +7,8 @@
#define IP6T_LOG_IPOPT 0x04 /* Log IP options */
#define IP6T_LOG_UID 0x08 /* Log UID owning local socket */
#define IP6T_LOG_NFLOG 0x10 /* Unsupported, don't use */
#define IP6T_LOG_MASK 0x1f
#define IP6T_LOG_MACDECODE 0x20 /* Decode MAC header */
#define IP6T_LOG_MASK 0x2f
struct ip6t_log_info {
unsigned char level;