Hi,
On 12/20/2013 10:29 AM, Pablo Neira Ayuso wrote:
On Fri, Dec 20, 2013 at 10:26:38AM +0100, Pablo Neira Ayuso wrote:
Hi,
On Thu, Dec 19, 2013 at 12:03:26PM +0100, valentina.giusti@xxxxxxxxxxxx wrote:
From: Valentina Giusti <valentina.giusti@xxxxxxxxxxxxxxxx>
Thanks to commits 41063e9 (ipv4: Early TCP socket demux) and 421b388 (udp: ipv4:
Add udp early demux) it is now possible to parse UID and GID socket info
also for incoming TCP and UDP connections. Having this info available, it
is convenient to let NFQUEUE parse it in order to improve and refine the
traffic analysis in userspace.
Signed-off-by: Valentina Giusti <valentina.giusti@xxxxxxxxxxxx>
---
include/uapi/linux/netfilter/nfnetlink_queue.h | 5 ++++-
net/netfilter/nfnetlink_queue_core.c | 31 ++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/netfilter/nfnetlink_queue.h b/include/uapi/linux/netfilter/nfnetlink_queue.h
index 0132bad..8dd819e 100644
--- a/include/uapi/linux/netfilter/nfnetlink_queue.h
+++ b/include/uapi/linux/netfilter/nfnetlink_queue.h
@@ -47,6 +47,8 @@ enum nfqnl_attr_type {
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
};
@@ -99,7 +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/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 21258cf..2cdef07 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -297,6 +297,29 @@ nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
}
+static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
+{
+ const struct cred *cred;
+
+ if (sk && sk->sk_state != TCP_TIME_WAIT) {
+ read_lock_bh(&sk->sk_callback_lock);
+ if (sk->sk_socket && sk->sk_socket->file) {
+ cred = sk->sk_socket->file->f_cred;
+ if (nla_put_u32(skb, NFQA_UID, htonl(cred->fsuid)))
I'm hitting this compilation error here:
net/netfilter/nfnetlink_queue_core.c: In function ‘nfqnl_put_sk_uidgid’:
net/netfilter/nfnetlink_queue_core.c:308:4: error: aggregate value used where an integer was expected
It seems that in recent kernels you have to use:
from_kuid_munged(&init_user_ns, cred->fsuid);
to retrieve the integer that represents the uid.
Please,
sorry, I left this sentence incomplete, I was telling... Please, test
your patches with current git trees :-). Thanks.
Just to be on the safe side, I am testing my patches against the nf-next
tree, branch master. Is that correct?
Thanks,
Val
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