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Message-ID: <20061124220333.GO25048@Krystal>
Date: Fri, 24 Nov 2006 17:03:33 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To: linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
Greg Kroah-Hartman <gregkh@...e.de>,
Thomas Gleixner <tglx@...utronix.de>,
Tom Zanussi <zanussi@...ibm.com>,
Karim Yaghmour <karim@...rsys.com>,
Paul Mundt <lethal@...ux-sh.org>, Jes Sorensen <jes@....com>,
Richard J Moore <richardj_moore@...ibm.com>,
"Martin J. Bligh" <mbligh@...igh.org>,
Michel Dagenais <michel.dagenais@...ymtl.ca>,
Douglas Niehaus <niehaus@...s.ku.edu>, ltt-dev@...fik.org,
systemtap@...rces.redhat.com
Subject: [PATCH 14/16] LTTng 0.6.36 for 2.6.18 : Netlink control
Tracing control through netlink socket.
patch14-2.6.18-lttng-core-0.6.36-netlink-control.diff
Signed-off-by : Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
--BEGIN--
--- /dev/null
+++ b/ltt/ltt-control.c
@@ -0,0 +1,121 @@
+/* ltt-control.c
+ *
+ * LTT control module over a netlink socket.
+ *
+ * Inspired from Relay Apps, by Tom Zanussi and iptables
+ *
+ * Copyright 2005 -
+ * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <ltt/ltt-tracer.h>
+#include <linux/netlink.h>
+#include <linux/inet.h>
+#include <linux/ip.h>
+#include <linux/security.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <net/sock.h>
+#include "ltt-control.h"
+
+#define LTTCTLM_BASE 0x10
+#define LTTCTLM_CONTROL (LTTCTLM_BASE + 1) /* LTT control message */
+
+static struct sock *socket;
+
+void ltt_control_input(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh = NULL;
+ u8 *payload = NULL;
+ lttctl_peer_msg_t *msg;
+ int err;
+
+ printk(KERN_DEBUG "ltt-control ltt_control_input\n");
+
+ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (security_netlink_recv(skb, CAP_SYS_PTRACE)) {
+ netlink_ack(skb, nlh, EPERM);
+ kfree_skb(skb);
+ continue;
+ }
+ /* process netlink message pointed by skb->data */
+ err = EINVAL;
+ payload = NLMSG_DATA(nlh);
+ /* process netlink message with header pointed by
+ * nlh and payload pointed by payload
+ */
+ if (nlh->nlmsg_len !=
+ sizeof(lttctl_peer_msg_t) +
+ sizeof(struct nlmsghdr)) {
+ printk(KERN_ALERT "ltt-control bad message length %d vs. %zu\n",
+ nlh->nlmsg_len, sizeof(lttctl_peer_msg_t) +
+ sizeof(struct nlmsghdr));
+ netlink_ack(skb, nlh, EINVAL);
+ kfree_skb(skb);
+ continue;
+ }
+ msg = (lttctl_peer_msg_t*)payload;
+
+ switch (msg->op) {
+ case OP_CREATE:
+ err = ltt_control(LTT_CONTROL_CREATE_TRACE,
+ msg->trace_name,
+ msg->trace_type, msg->args);
+ break;
+ case OP_DESTROY:
+ err = ltt_control(LTT_CONTROL_DESTROY_TRACE,
+ msg->trace_name,
+ msg->trace_type, msg->args);
+ break;
+ case OP_START:
+ err = ltt_control(LTT_CONTROL_START,
+ msg->trace_name,
+ msg->trace_type, msg->args);
+ break;
+ case OP_STOP:
+ err = ltt_control(LTT_CONTROL_STOP,
+ msg->trace_name,
+ msg->trace_type, msg->args);
+ break;
+ default:
+ err = EBADRQC;
+ printk(KERN_INFO
+ "ltt-control invalid operation\n");
+ }
+ netlink_ack(skb, nlh, err);
+ kfree_skb(skb);
+ }
+}
+
+
+static int ltt_control_init(void)
+{
+ printk(KERN_INFO "ltt-control init\n");
+
+ socket = netlink_kernel_create(NETLINK_LTT, 1,
+ ltt_control_input, THIS_MODULE);
+ if (socket == NULL)
+ return -EPERM;
+ else
+ return 0;
+}
+
+static void ltt_control_exit(void)
+{
+ printk(KERN_INFO "ltt-control exit\n");
+ sock_release(socket->sk_socket);
+}
+
+
+module_init(ltt_control_init)
+module_exit(ltt_control_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Linux Trace Toolkit Controller");
+
--- /dev/null
+++ b/ltt/ltt-control.h
@@ -0,0 +1,31 @@
+/* ltt-control.h
+ *
+ * LTT control module over a netlink socket.
+ *
+ * Inspired from Relay Apps, by Tom Zanussi and iptables
+ *
+ * Copyright 2005 -
+ * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
+ */
+
+#ifndef _LTT_CONTROL_H
+#define _LTT_CONTROL_H
+
+enum trace_op {
+ OP_CREATE,
+ OP_DESTROY,
+ OP_START,
+ OP_STOP,
+ OP_ALIGN,
+ OP_NONE
+};
+
+typedef struct lttctl_peer_msg {
+ char trace_name[NAME_MAX];
+ char trace_type[NAME_MAX];
+ enum trace_op op;
+ union ltt_control_args args;
+} lttctl_peer_msg_t;
+
+#endif //_LTT_CONTROL_H
+
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -21,6 +21,7 @@ #define NETLINK_IP6_FW 13
#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
#define NETLINK_GENERIC 16
+#define NETLINK_LTT 31 /* Linux Trace Toolkit FIXME */
#define MAX_LINKS 32
--END--
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