[PATCH 2/2] iptables: xt_LOG: Add ring buffer support
From: Richard Weinberger
Date: Sat Feb 04 2012 - 19:17:33 EST
This patch adds "--ring" and "--ring-size" to xt_LOG.
Signed-off-by: Richard Weinberger <richard@xxxxxx>
---
extensions/libxt_LOG.c | 129 ++++++++++++++++++++++++++++++++++++++
extensions/libxt_LOG.man | 9 +++
include/linux/netfilter/xt_LOG.h | 13 ++++-
3 files changed, 150 insertions(+), 1 deletions(-)
diff --git a/extensions/libxt_LOG.c b/extensions/libxt_LOG.c
index a4c11b6..a9afbb5 100644
--- a/extensions/libxt_LOG.c
+++ b/extensions/libxt_LOG.c
@@ -1,10 +1,12 @@
#include <stdio.h>
#include <string.h>
+#include <ctype.h>
#include <syslog.h>
#include <xtables.h>
#include <linux/netfilter/xt_LOG.h>
#define LOG_DEFAULT_LEVEL LOG_WARNING
+#define DEFAULT_RING_SIZE 1024
#ifndef XT_LOG_UID /* Old kernel */
#define XT_LOG_UID 0x08 /* Log UID owning local socket */
@@ -20,6 +22,9 @@ enum {
O_LOG_IPOPTS,
O_LOG_UID,
O_LOG_MAC,
+ O_LOG_TIMESTAMP,
+ O_LOG_RING_NAME,
+ O_LOG_RING_SIZE,
};
static void LOG_help(void)
@@ -35,6 +40,17 @@ static void LOG_help(void)
" --log-macdecode Decode MAC addresses and protocol.\n\n");
}
+static void LOG_help_v1(void)
+{
+ LOG_help();
+
+ printf(
+" --log-timestamp Add the current time to the log message.\n\n"
+" --ring NAME Log messages into a ring buffer NAME instead of kernel syslog.\n\n"
+" --ring-size SIZE Size of the ring buffer in KiB.\n\n"
+);
+}
+
#define s struct xt_log_info
static const struct xt_option_entry LOG_opts[] = {
{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
@@ -50,6 +66,26 @@ static const struct xt_option_entry LOG_opts[] = {
};
#undef s
+#define s struct xt_log_info_v1
+static const struct xt_option_entry LOG_opts_v1[] = {
+ {.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
+ .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
+ {.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
+ .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
+ {.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
+ {.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
+ {.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
+ {.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
+ {.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
+ {.name = "log-timestamp", .id = O_LOG_TIMESTAMP, .type = XTTYPE_NONE},
+ {.name = "ring", .id = O_LOG_RING_NAME, .type = XTTYPE_STRING,
+ .flags = XTOPT_PUT, XTOPT_POINTER(s, ring_name), .min = 1},
+ {.name = "ring-size", .id = O_LOG_RING_SIZE, .type = XTTYPE_UINT64,
+ .flags = XTOPT_PUT, XTOPT_POINTER(s, ring_size)},
+ XTOPT_TABLEEND,
+};
+#undef s
+
static void LOG_init(struct xt_entry_target *t)
{
struct xt_log_info *loginfo = (struct xt_log_info *)t->data;
@@ -104,6 +140,29 @@ static void LOG_parse(struct xt_option_call *cb)
}
}
+static void LOG_parse_v1(struct xt_option_call *cb)
+{
+ struct xt_log_info_v1 *info = cb->data;
+ int i;
+
+ LOG_parse(cb);
+
+ switch (cb->entry->id) {
+ case O_LOG_TIMESTAMP:
+ info->logflags |= XT_LOG_ADD_TIMESTAMP;
+ break;
+ case O_LOG_RING_NAME:
+ if (!info->ring_size)
+ info->ring_size = DEFAULT_RING_SIZE;
+
+ for (i = 0; i < strlen(info->ring_name); i++)
+ if (!isalnum(cb->arg[i]))
+ xtables_error(PARAMETER_PROBLEM,
+ "Ring name is not alphanumeric");
+ break;
+ }
+}
+
static void LOG_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
@@ -141,6 +200,27 @@ static void LOG_print(const void *ip, const struct xt_entry_target *target,
printf(" prefix \"%s\"", loginfo->prefix);
}
+static void LOG_print_v1(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct xt_log_info_v1 *loginfo
+ = (const struct xt_log_info_v1 *)target->data;
+
+ LOG_print(ip, target, numeric);
+
+ if (!numeric) {
+ if (loginfo->logflags & XT_LOG_ADD_TIMESTAMP)
+ printf(" log-timestamp");
+ }
+
+ if (loginfo->ring_name[0]) {
+ printf(" ring \"%s\"", loginfo->ring_name);
+
+ if (loginfo->ring_size != DEFAULT_RING_SIZE)
+ printf(" ring-size %lu", (unsigned long)loginfo->ring_size);
+ }
+}
+
static void LOG_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_log_info *loginfo
@@ -166,6 +246,25 @@ static void LOG_save(const void *ip, const struct xt_entry_target *target)
printf(" --log-macdecode");
}
+static void LOG_save_v1(const void *ip, const struct xt_entry_target *target)
+{
+ const struct xt_log_info_v1 *loginfo
+ = (const struct xt_log_info_v1 *)target->data;
+
+ LOG_save(ip, target);
+
+ if (loginfo->logflags & XT_LOG_ADD_TIMESTAMP)
+ printf(" --log-timestamp");
+
+ if (loginfo->ring_name[0]) {
+ printf(" --ring");
+ xtables_save_string(loginfo->ring_name);
+
+ if (loginfo->ring_size != DEFAULT_RING_SIZE)
+ printf(" --ring-size %lu", (unsigned long)loginfo->ring_size);
+ }
+}
+
static struct xtables_target log_tg_regs[] = {
{
.name = "LOG",
@@ -176,6 +275,7 @@ static struct xtables_target log_tg_regs[] = {
.help = LOG_help,
.init = LOG_init,
.print = LOG_print,
+ .revision = 0,
.save = LOG_save,
.x6_parse = LOG_parse,
.x6_options = LOG_opts,
@@ -189,10 +289,39 @@ static struct xtables_target log_tg_regs[] = {
.help = LOG_help,
.init = LOG_init,
.print = LOG_print,
+ .revision = 0,
.save = LOG_save,
.x6_parse = LOG_parse,
.x6_options = LOG_opts,
},
+ {
+ .name = "LOG",
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV4,
+ .size = XT_ALIGN(sizeof(struct xt_log_info_v1)),
+ .userspacesize = offsetof(struct xt_log_info_v1, rctx),
+ .help = LOG_help_v1,
+ .init = LOG_init,
+ .print = LOG_print_v1,
+ .revision = 1,
+ .save = LOG_save_v1,
+ .x6_parse = LOG_parse_v1,
+ .x6_options = LOG_opts_v1,
+ },
+ {
+ .name = "LOG",
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV6,
+ .size = XT_ALIGN(sizeof(struct xt_log_info_v1)),
+ .userspacesize = offsetof(struct xt_log_info_v1, rctx),
+ .help = LOG_help_v1,
+ .init = LOG_init,
+ .print = LOG_print_v1,
+ .revision = 1,
+ .save = LOG_save_v1,
+ .x6_parse = LOG_parse_v1,
+ .x6_options = LOG_opts_v1,
+ },
};
void _init(void)
diff --git a/extensions/libxt_LOG.man b/extensions/libxt_LOG.man
index 47c35e0..2f0b2ff 100644
--- a/extensions/libxt_LOG.man
+++ b/extensions/libxt_LOG.man
@@ -29,3 +29,12 @@ Log options from the IP packet header.
.TP
\fB\-\-log\-uid\fP
Log the userid of the process which generated the packet.
+\fB\-\-log\-timestamp\fP
+Add a timestamp to each log message.
+\fB\-\-ring\fP \fIname\fP
+Log all messages into a ring buffer identified by \fIname\fP.
+Each ring buffer is represented as file in
+/proc/net/netfilter/xt_LOG_ring/.
+\fB\-\-ring\-size\fP \fIsize\fP
+Set the ring buffer size in KiB.
+Default is 1024 KiB.
diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
index cac0790..d84710c 100644
--- a/include/linux/netfilter/xt_LOG.h
+++ b/include/linux/netfilter/xt_LOG.h
@@ -8,7 +8,8 @@
#define XT_LOG_UID 0x08 /* Log UID owning local socket */
#define XT_LOG_NFLOG 0x10 /* Unsupported, don't reuse */
#define XT_LOG_MACDECODE 0x20 /* Decode MAC header */
-#define XT_LOG_MASK 0x2f
+#define XT_LOG_ADD_TIMESTAMP 0x40 /* Add a timestamp */
+#define XT_LOG_MASK 0x6f
struct xt_log_info {
unsigned char level;
@@ -16,4 +17,14 @@ struct xt_log_info {
char prefix[30];
};
+struct xt_log_info_v1 {
+ unsigned char level;
+ unsigned char logflags;
+ char prefix[30];
+
+ char ring_name[30];
+ __aligned_u64 ring_size;
+ struct xt_LOG_ring_ctx *rctx __attribute__((aligned(8)));
+};
+
#endif /* _XT_LOG_H */
--
1.7.7.3
--
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