On Mon, 2014-01-06 at 00:12 +0100, Pablo Neira Ayuso wrote:
> From: Valentina Giusti <valentina.giusti@xxxxxxxxxxxx>
>
> 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>
> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
> ---
> include/uapi/linux/netfilter/nfnetlink_queue.h | 5 +++-
> net/netfilter/nfnetlink_queue_core.c | 34 ++++++++++++++++++++++++
> 2 files changed, 38 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..d3cf12b 100644
> --- a/net/netfilter/nfnetlink_queue_core.c
> +++ b/net/netfilter/nfnetlink_queue_core.c
> @@ -297,6 +297,31 @@ 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_state == TCP_TIME_WAIT)
> + return 0;
> +
net/netfilter/nfnetlink_queue_core.c: In function 'nfqnl_put_sk_uidgid':
net/netfilter/nfnetlink_queue_core.c:304:35: error: 'TCP_TIME_WAIT' undeclared (first use in this function)
net/netfilter/nfnetlink_queue_core.c:304:35: note: each undeclared identifier is reported only once for each function it appears in
make[3]: *** [net/netfilter/nfnetlink_queue_core.o] Error 1
Fix is obvious (#include <net/tcp_states.h>), but I have to run...
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