From: Ken-ichirou MATSUZAWA <chamaken@xxxxxxxxx>
This patch enables to include the conntrack information together
with the packet that is sent to user-space via NFLOG, then a
user-space program can acquire NATed information by this NFULA_CT
attribute.
Including the conntrack information is optional, you can set it
via NFULNL_CFG_F_CONNTRACK flag with the NFULA_CFG_FLAGS attribute
like NFQUEUE.
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@xxxxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/uapi/linux/netfilter/nfnetlink_log.h | 3 +++
net/netfilter/Kconfig | 9 ++++---
net/netfilter/nfnetlink_log.c | 37 ++++++++++++++++++++++++----
3 files changed, 40 insertions(+), 9 deletions(-)
diff --git a/include/uapi/linux/netfilter/nfnetlink_log.h b/include/uapi/linux/netfilter/nfnetlink_log.h
index 90c2c95..fb21f0c 100644
--- a/include/uapi/linux/netfilter/nfnetlink_log.h
+++ b/include/uapi/linux/netfilter/nfnetlink_log.h
@@ -51,6 +51,8 @@ enum nfulnl_attr_type {
NFULA_HWTYPE, /* hardware type */
NFULA_HWHEADER, /* hardware header */
NFULA_HWLEN, /* hardware header length */
+ NFULA_CT, /* nf_conntrack_netlink.h */
+ NFULA_CT_INFO, /* enum ip_conntrack_info */
__NFULA_MAX
};
@@ -93,5 +95,6 @@ enum nfulnl_attr_config {
#define NFULNL_CFG_F_SEQ 0x0001
#define NFULNL_CFG_F_SEQ_GLOBAL 0x0002
+#define NFULNL_CFG_F_CONNTRACK 0x0004
#endif /* _NFNETLINK_LOG_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index d287818..e22349e 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -363,12 +363,13 @@ config NF_CT_NETLINK_HELPER
If unsure, say `N'.
config NETFILTER_NETLINK_GLUE_CT
- bool "NFQUEUE integration with Connection Tracking"
+ bool "NFQUEUE and NFLOG integration with Connection Tracking"
default n
- depends on NETFILTER_NETLINK_QUEUE && NF_CT_NETLINK
+ depends on (NETFILTER_NETLINK_QUEUE || NETFILTER_NETLINK_LOG) && NF_CT_NETLINK
help
- If this option is enabled, NFQUEUE can include Connection Tracking
- information together with the packet is the enqueued via NFNETLINK.
+ If this option is enabled, NFQUEUE and NFLOG can include
+ Connection Tracking information together with the packet is
+ the enqueued via NFNETLINK.
config NF_NAT
tristate
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 4670821..e1d1187 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -27,6 +27,7 @@
#include <net/netlink.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_log.h>
+#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
@@ -401,7 +402,9 @@ __build_packet_message(struct nfnl_log_net *log,
unsigned int hooknum,
const struct net_device *indev,
const struct net_device *outdev,
- const char *prefix, unsigned int plen)
+ const char *prefix, unsigned int plen,
+ const struct nfnl_ct_hook *nfnl_ct,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
struct nfulnl_msg_packet_hdr pmsg;
struct nlmsghdr *nlh;
@@ -575,6 +578,10 @@ __build_packet_message(struct nfnl_log_net *log,
htonl(atomic_inc_return(&log->global_seq))))
goto nla_put_failure;
+ if (ct && nfnl_ct->build(inst->skb, ct, ctinfo,
+ NFULA_CT, NFULA_CT_INFO) < 0)
+ goto nla_put_failure;
+
if (data_len) {
struct nlattr *nla;
int size = nla_attr_size(data_len);
@@ -620,12 +627,16 @@ nfulnl_log_packet(struct net *net,
const struct nf_loginfo *li_user,
const char *prefix)
{
- unsigned int size, data_len;
+ size_t size;
+ unsigned int data_len;
struct nfulnl_instance *inst;
const struct nf_loginfo *li;
unsigned int qthreshold;
unsigned int plen;
struct nfnl_log_net *log = nfnl_log_pernet(net);
+ const struct nfnl_ct_hook *nfnl_ct = NULL;
+ struct nf_conn *ct = NULL;
+ enum ip_conntrack_info uninitialized_var(ctinfo);
if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
li = li_user;
@@ -671,6 +682,14 @@ nfulnl_log_packet(struct net *net,
size += nla_total_size(sizeof(u_int32_t));
if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
size += nla_total_size(sizeof(u_int32_t));
+ if (inst->flags & NFULNL_CFG_F_CONNTRACK) {
+ nfnl_ct = rcu_dereference(nfnl_ct_hook);
+ if (nfnl_ct != NULL) {
+ ct = nfnl_ct->get_ct(skb, &ctinfo);
+ if (ct != NULL)
+ size += nfnl_ct->build_size(ct);
+ }
+ }
qthreshold = inst->qthreshold;
/* per-rule qthreshold overrides per-instance */
@@ -715,7 +734,8 @@ nfulnl_log_packet(struct net *net,
inst->qlen++;
__build_packet_message(log, inst, skb, data_len, pf,
- hooknum, in, out, prefix, plen);
+ hooknum, in, out, prefix, plen,
+ nfnl_ct, ct, ctinfo);
if (inst->qlen >= qthreshold)
__nfulnl_flush(inst);
@@ -899,13 +919,20 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
}
if (nfula[NFULA_CFG_FLAGS]) {
- __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
+ u16 flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS]));
if (!inst) {
ret = -ENODEV;
goto out;
}
- nfulnl_set_flags(inst, ntohs(flags));
+
+ if (flags & NFULNL_CFG_F_CONNTRACK &&
+ rcu_access_pointer(nfnl_ct_hook) == NULL) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ nfulnl_set_flags(inst, flags);
}
out_put:
--
2.1.4
--
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