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Message-Id: <1389101420-16557-2-git-send-email-valentina.giusti@bmw-carit.de>
Date: Tue, 7 Jan 2014 14:30:19 +0100
From: valentina.giusti@...-carit.de
To: pablo@...filter.org, netfilter-devel@...r.kernel.org
Cc: netdev@...r.kernel.org, fw@...len.de, daniel.wagner@...-carit.de
Subject: [PATCH 1/2] src: add support for UID/GID socket info
From: Valentina Giusti <Valentina.Giusti@...-carit.de>
With this patch libnetfilter_queue is able to parse UID/GID
socket information.
Signed-off-by: Valentina Giusti <Valentina.Giusti@...-carit.de>
---
include/libnetfilter_queue/libnetfilter_queue.h | 4 ++
include/libnetfilter_queue/linux_nfnetlink_queue.h | 6 ++-
include/linux/netfilter/nfnetlink_queue.h | 6 ++-
src/libnetfilter_queue.c | 46 ++++++++++++++++++++++
src/nlmsg.c | 2 +
5 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/include/libnetfilter_queue/libnetfilter_queue.h b/include/libnetfilter_queue/libnetfilter_queue.h
index b9f16e2..122cd10 100644
--- a/include/libnetfilter_queue/libnetfilter_queue.h
+++ b/include/libnetfilter_queue/libnetfilter_queue.h
@@ -103,6 +103,8 @@ extern u_int32_t nfq_get_indev(struct nfq_data *nfad);
extern u_int32_t nfq_get_physindev(struct nfq_data *nfad);
extern u_int32_t nfq_get_outdev(struct nfq_data *nfad);
extern u_int32_t nfq_get_physoutdev(struct nfq_data *nfad);
+extern int nfq_get_uid(struct nfq_data *nfad, u_int32_t *uid);
+extern int nfq_get_gid(struct nfq_data *nfad, u_int32_t *gid);
extern int nfq_get_indev_name(struct nlif_handle *nlif_handle,
struct nfq_data *nfad, char *name);
@@ -125,6 +127,8 @@ enum {
NFQ_XML_PHYSDEV = (1 << 3),
NFQ_XML_PAYLOAD = (1 << 4),
NFQ_XML_TIME = (1 << 5),
+ NFQ_XML_UID = (1 << 6),
+ NFQ_XML_GID = (1 << 7),
NFQ_XML_ALL = ~0U,
};
diff --git a/include/libnetfilter_queue/linux_nfnetlink_queue.h b/include/libnetfilter_queue/linux_nfnetlink_queue.h
index 81a485b..f732201 100644
--- a/include/libnetfilter_queue/linux_nfnetlink_queue.h
+++ b/include/libnetfilter_queue/linux_nfnetlink_queue.h
@@ -49,6 +49,9 @@ enum nfqnl_attr_type {
NFQA_CT_INFO, /* enum ip_conntrack_info */
NFQA_CAP_LEN, /* __u32 length of captured packet */
NFQA_SKB_INFO, /* __u32 skb meta information */
+ NFQA_EXP, /* nf_conntrack_netlink.h */
+ NFQA_UID, /* __u32 sk uid */
+ NFQA_GID, /* __u32 sk gid */
__NFQA_MAX
};
@@ -101,7 +104,8 @@ enum nfqnl_attr_config {
#define NFQA_CFG_F_FAIL_OPEN (1 << 0)
#define NFQA_CFG_F_CONNTRACK (1 << 1)
#define NFQA_CFG_F_GSO (1 << 2)
-#define NFQA_CFG_F_MAX (1 << 3)
+#define NFQA_CFG_F_UID_GID (1 << 3)
+#define NFQA_CFG_F_MAX (1 << 4)
/* flags for NFQA_SKB_INFO */
/* packet appears to have wrong checksums, but they are ok */
diff --git a/include/linux/netfilter/nfnetlink_queue.h b/include/linux/netfilter/nfnetlink_queue.h
index a2308ae..22f5d45 100644
--- a/include/linux/netfilter/nfnetlink_queue.h
+++ b/include/linux/netfilter/nfnetlink_queue.h
@@ -46,6 +46,9 @@ enum nfqnl_attr_type {
NFQA_CT_INFO, /* enum ip_conntrack_info */
NFQA_CAP_LEN, /* __u32 length of captured packet */
NFQA_SKB_INFO, /* __u32 skb meta information */
+ NFQA_EXP, /* nf_conntrack_netlink.h */
+ NFQA_UID, /* __u32 sk uid */
+ NFQA_GID, /* __u32 sk gid */
__NFQA_MAX
};
@@ -98,7 +101,8 @@ enum nfqnl_attr_config {
#define NFQA_CFG_F_FAIL_OPEN (1 << 0)
#define NFQA_CFG_F_CONNTRACK (1 << 1)
#define NFQA_CFG_F_GSO (1 << 2)
-#define NFQA_CFG_F_MAX (1 << 3)
+#define NFQA_CFG_F_UID_GID (1 << 3)
+#define NFQA_CFG_F_MAX (1 << 4)
/* flags for NFQA_SKB_INFO */
/* packet appears to have wrong checksums, but they are ok */
diff --git a/src/libnetfilter_queue.c b/src/libnetfilter_queue.c
index fa8efe7..32725d1 100644
--- a/src/libnetfilter_queue.c
+++ b/src/libnetfilter_queue.c
@@ -668,6 +668,9 @@ EXPORT_SYMBOL(nfq_set_mode);
* if this bit is set, the layer 3/4 checksums of the packet appear incorrect,
* but are not (because they will be corrected later by the kernel).
*
+ * - NFQA_CFG_F_UID_GID: the kernel will dump UID and GID of the socket to
+ * which each packet belongs.
+ *
* Here's a little code snippet to show how to use this API:
* \verbatim
uint32_t flags = NFQA_CFG_F_FAIL_OPEN;
@@ -1181,6 +1184,38 @@ struct nfqnl_msg_packet_hw *nfq_get_packet_hw(struct nfq_data *nfad)
EXPORT_SYMBOL(nfq_get_packet_hw);
/**
+ * nfq_get_uid - get the UID of the user the packet belongs to
+ * \param nfad Netlink packet data handle passed to callback function
+ *
+ * \return 1 if there is a UID available, 0 otherwise.
+ */
+int nfq_get_uid(struct nfq_data *nfad, u_int32_t *uid)
+{
+ if (!nfnl_attr_present(nfad->data, NFQA_UID))
+ return 0;
+
+ *uid = ntohl(nfnl_get_data(nfad->data, NFQA_UID, u_int32_t));
+ return 1;
+}
+EXPORT_SYMBOL(nfq_get_uid);
+
+/**
+ * nfq_get_gid - get the GID of the user the packet belongs to
+ * \param nfad Netlink packet data handle passed to callback function
+ *
+ * \return 1 if there is a GID available, 0 otherwise.
+ */
+int nfq_get_gid(struct nfq_data *nfad, u_int32_t *gid)
+{
+ if (!nfnl_attr_present(nfad->data, NFQA_GID))
+ return 0;
+
+ *gid = ntohl(nfnl_get_data(nfad->data, NFQA_GID, u_int32_t));
+ return 1;
+}
+EXPORT_SYMBOL(nfq_get_gid);
+
+/**
* nfq_get_payload - get payload
* \param nfad Netlink packet data handle passed to callback function
* \param data Pointer of pointer that will be pointed to the payload
@@ -1250,6 +1285,7 @@ int nfq_snprintf_xml(char *buf, size_t rem, struct nfq_data *tb, int flags)
struct nfqnl_msg_packet_hdr *ph;
struct nfqnl_msg_packet_hw *hwph;
u_int32_t mark, ifi;
+ u_int32_t uid, gid;
int size, offset = 0, len = 0, ret;
unsigned char *data;
@@ -1365,6 +1401,16 @@ int nfq_snprintf_xml(char *buf, size_t rem, struct nfq_data *tb, int flags)
SNPRINTF_FAILURE(size, rem, offset, len);
}
+ if (nfq_get_uid(tb, &uid) && (flags & NFQ_XML_UID)) {
+ size = snprintf(buf + offset, rem, "<uid>%u</uid>", uid);
+ SNPRINTF_FAILURE(size, rem, offset, len);
+ }
+
+ if (nfq_get_gid(tb, &gid) && (flags & NFQ_XML_GID)) {
+ size = snprintf(buf + offset, rem, "<gid>%u</gid>", gid);
+ SNPRINTF_FAILURE(size, rem, offset, len);
+ }
+
ret = nfq_get_payload(tb, &data);
if (ret >= 0 && (flags & NFQ_XML_PAYLOAD)) {
int i;
diff --git a/src/nlmsg.c b/src/nlmsg.c
index e7a30e0..81e170e 100644
--- a/src/nlmsg.c
+++ b/src/nlmsg.c
@@ -134,6 +134,8 @@ static int nfq_pkt_parse_attr_cb(const struct nlattr *attr, void *data)
case NFQA_IFINDEX_PHYSOUTDEV:
case NFQA_CAP_LEN:
case NFQA_SKB_INFO:
+ case NFQA_UID:
+ case NFQA_GID:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
--
1.8.5.1
--
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