[NETFILTER]: nfnetlink_log: include GID in netlink message

Similar to Maciej Soltysiak's ipt_LOG patch, include GID in addition
to UID in netlink message.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter/nfnetlink_log.h

@@ -47,6 +47,7 @@ enum nfulnl_attr_type {
 	NFULA_UID,			/* user id of socket */
 	NFULA_SEQ,			/* instance-local sequence number */
 	NFULA_SEQ_GLOBAL,		/* global sequence number */
+	NFULA_GID,			/* group id of socket */
 
 	__NFULA_MAX
 };

net/netfilter/nfnetlink_log.c

@@ -467,9 +467,11 @@ __build_packet_message(struct nfulnl_instance *inst,
 		read_lock_bh(&skb->sk->sk_callback_lock);
 		if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
 			__be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
+			__be32 gid = htons(skb->sk->sk_socket->file->f_gid);
 			/* need to unlock here since NLA_PUT may goto */
 			read_unlock_bh(&skb->sk->sk_callback_lock);
 			NLA_PUT_BE32(inst->skb, NFULA_UID, uid);
+			NLA_PUT_BE32(inst->skb, NFULA_GID, gid);
 		} else
 			read_unlock_bh(&skb->sk->sk_callback_lock);
 	}
@@ -564,6 +566,7 @@ nfulnl_log_packet(unsigned int pf,
 #endif
 		+ nla_total_size(sizeof(u_int32_t))	/* mark */
 		+ nla_total_size(sizeof(u_int32_t))	/* uid */
+		+ nla_total_size(sizeof(u_int32_t))	/* gid */
 		+ nla_total_size(plen)			/* prefix */
 		+ nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
 		+ nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp));