This patch adds a new configuration variable which is used to limit
conntrack event to connection of these protocols:
For example:
accept_proto_filter=tcp,sctp
Signed-off-by: Eric Leblond <eric@xxxxxxxxx>
---
input/flow/ulogd_inpflow_NFCT.c | 60 +++++++++++++++++++++++++++++++++++++--
ulogd.conf.in | 1 +
2 files changed, 59 insertions(+), 2 deletions(-)
diff --git a/input/flow/ulogd_inpflow_NFCT.c b/input/flow/ulogd_inpflow_NFCT.c
index b3e48d7..3889b10 100644
--- a/input/flow/ulogd_inpflow_NFCT.c
+++ b/input/flow/ulogd_inpflow_NFCT.c
@@ -36,6 +36,7 @@
#include <sys/time.h>
#include <time.h>
#include <netinet/in.h>
+#include <netdb.h>
#include <ulogd/linuxlist.h>
#include <ulogd/jhash.h>
#include <ulogd/hash.h>
@@ -73,7 +74,7 @@ struct nfct_pluginstance {
#define EVENT_MASK NF_NETLINK_CONNTRACK_NEW | NF_NETLINK_CONNTRACK_DESTROY
static struct config_keyset nfct_kset = {
- .num_ces = 11,
+ .num_ces = 12,
.ces = {
{
.key = "pollinterval",
@@ -139,6 +140,11 @@ static struct config_keyset nfct_kset = {
.type = CONFIG_TYPE_STRING,
.options = CONFIG_OPT_NONE,
},
+ {
+ .key = "accept_proto_filter",
+ .type = CONFIG_TYPE_STRING,
+ .options = CONFIG_OPT_NONE,
+ },
},
};
#define pollint_ce(x) (x->ces[0])
@@ -152,6 +158,7 @@ static struct config_keyset nfct_kset = {
#define reliable_ce(x) (x->ces[8])
#define src_filter_ce(x) ((x)->ces[9])
#define dst_filter_ce(x) ((x)->ces[10])
+#define proto_filter_ce(x) ((x)->ces[11])
enum nfct_keys {
NFCT_ORIG_IP_SADDR = 0,
@@ -1143,6 +1150,46 @@ static int build_nfct_filter_dir(struct nfct_filter *filter, char* filter_string
return 0;
}
+static int build_nfct_filter_proto(struct nfct_filter *filter, char* filter_string)
+{
+ char *from = filter_string;
+ char *comma;
+ struct protoent * pent = NULL;
+
+ while ((comma = strchr(from, ',')) != NULL) {
+ size_t len = comma - from;
+ *comma = 0;
+ pent = getprotobyname(from);
+ if (pent == NULL) {
+ ulogd_log(ULOGD_FATAL, "Unknown protocol\n");
+ endprotoent();
+ return -1;
+ }
+ ulogd_log(ULOGD_NOTICE, "adding proto to filter: \"%s\" (%d)\n",
+ pent->p_name, pent->p_proto
+ );
+ nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO,
+ pent->p_proto);
+ from += len + 1;
+ }
+ pent = getprotobyname(from);
+ if (pent == NULL) {
+ ulogd_log(ULOGD_FATAL, "Unknown protocol %s\n", from);
+ endprotoent();
+ return -1;
+ }
+ ulogd_log(ULOGD_NOTICE, "adding proto to filter: \"%s (%d)\"\n",
+ pent->p_name, pent->p_proto
+ );
+ nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO,
+ pent->p_proto);
+
+
+ endprotoent();
+ return 0;
+}
+
+
static int build_nfct_filter(struct ulogd_pluginstance *upi)
{
struct nfct_pluginstance *cpi =
@@ -1176,6 +1223,14 @@ static int build_nfct_filter(struct ulogd_pluginstance *upi)
goto err_filter;
}
}
+ if (strlen(proto_filter_ce(upi->config_kset).u.string) != 0) {
+ char *filter_string = proto_filter_ce(upi->config_kset).u.string;
+ if (build_nfct_filter_proto(filter, filter_string) != 0) {
+ ulogd_log(ULOGD_FATAL,
+ "Unable to create proto filter\n");
+ goto err_filter;
+ }
+ }
if (filter) {
if (nfct_filter_attach(nfct_fd(cpi->cth), filter) == -1) {
@@ -1208,7 +1263,8 @@ static int constructor_nfct_events(struct ulogd_pluginstance *upi)
}
if ((strlen(src_filter_ce(upi->config_kset).u.string) != 0) ||
- (strlen(dst_filter_ce(upi->config_kset).u.string) != 0)
+ (strlen(dst_filter_ce(upi->config_kset).u.string) != 0) ||
+ (strlen(proto_filter_ce(upi->config_kset).u.string) != 0)
) {
if (build_nfct_filter(upi) != 0) {
ulogd_log(ULOGD_FATAL, "error creating NFCT filter\n");
diff --git a/ulogd.conf.in b/ulogd.conf.in
index fa1fbf2..783cb2b 100644
--- a/ulogd.conf.in
+++ b/ulogd.conf.in
@@ -129,6 +129,7 @@ plugin="@pkglibdir@/ulogd_output_GRAPHITE.so"
# In this case, you can use the following filters on events:
#accept_src_filter=192.168.1.0/24,1:2::/64 # source ip of connection must belong to these networks
#accept_dst_filter=192.168.1.0/24 # destination ip of connection must belong to these networks
+#accept_proto_filter=tcp,sctp # layer 4 proto of connections
[ct2]
#netlink_socket_buffer_size=217088
--
1.7.10.4
--
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