[PATCH net-next v6 0/6] net: tcp: sctp: dccp: Replace jprobe usage with trace events

[PATCH net-next v6 0/6] net: tcp: sctp: dccp: Replace jprobe usage with trace events

[Masami Hiramatsu]

Hi,

This series is v6 of the replacement of jprobe usage with trace
events. This version fixes trace/events/tcp.h to avoid sparse
warning, as same as Mat Martineau's patch.

Previous version is here;
 https://www.spinics.net/lists/netdev/msg474057.html

Changes from v5:
  [1/6]: Avoid preprocessor directives in tracepoint macro args

Thank you,

---

Masami Hiramatsu (6):
      net: tcp: Add trace events for TCP congestion window tracing
      net: tcp: Remove TCP probe module
      net: sctp: Add SCTP ACK tracking trace event
      net: sctp: Remove debug SCTP probe module
      net: dccp: Add DCCP sendmsg trace event
      net: dccp: Remove dccpprobe module


 include/trace/events/sctp.h |   99 ++++++++++++++
 include/trace/events/tcp.h  |   97 ++++++++++++++
 net/Kconfig                 |   17 --
 net/dccp/Kconfig            |   17 --
 net/dccp/Makefile           |    5 -
 net/dccp/probe.c            |  203 -----------------------------
 net/dccp/proto.c            |    5 +
 net/dccp/trace.h            |  105 +++++++++++++++
 net/ipv4/Makefile           |    1 
 net/ipv4/tcp_input.c        |    3 
 net/ipv4/tcp_probe.c        |  301 -------------------------------------------
 net/sctp/Kconfig            |   12 --
 net/sctp/Makefile           |    3 
 net/sctp/probe.c            |  244 -----------------------------------
 net/sctp/sm_statefuns.c     |    5 +
 15 files changed, 317 insertions(+), 800 deletions(-)
 create mode 100644 include/trace/events/sctp.h
 delete mode 100644 net/dccp/probe.c
 create mode 100644 net/dccp/trace.h
 delete mode 100644 net/ipv4/tcp_probe.c
 delete mode 100644 net/sctp/probe.c

--
Masami Hiramatsu (Linaro) <mhiramat@kernel.org>

[PATCH net-next v6 1/6] net: tcp: Add trace events for TCP congestion window tracing

[Masami Hiramatsu]

This adds an event to trace TCP stat variables with
slightly intrusive trace-event. This uses ftrace/perf
event log buffer to trace those state, no needs to
prepare own ring-buffer, nor custom user apps.

User can use ftrace to trace this event as below;

  # cd /sys/kernel/debug/tracing
  # echo 1 > events/tcp/tcp_probe/enable
  (run workloads)
  # cat trace

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v6:
  - Avoid preprocessor directives in tracepoint macro args as
    Mat did on net tree.
---
 include/trace/events/tcp.h |   97 ++++++++++++++++++++++++++++++++++++++++++++
 net/ipv4/tcp_input.c       |    3 +
 2 files changed, 100 insertions(+)

diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index 8e88a1671538..4dea6342f7d4 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM tcp
 
@@ -8,6 +9,7 @@
 #include <linux/tcp.h>
 #include <linux/tracepoint.h>
 #include <net/ipv6.h>
+#include <net/tcp.h>
 
 /*
  * tcp event with arguments sk and skb
@@ -277,6 +279,101 @@ TRACE_EVENT(tcp_retransmit_synack,
 		  __entry->saddr_v6, __entry->daddr_v6)
 );
 
+
+#define TP_STORE_ADDR_PORTS_V4(__entry, inet, sk)			\
+	do {								\
+		struct sockaddr_in *v4 = (void *)__entry->saddr;	\
+									\
+		v4->sin_family = AF_INET;				\
+		v4->sin_port = inet->inet_sport;			\
+		v4->sin_addr.s_addr = inet->inet_saddr;			\
+		v4 = (void *)__entry->daddr;				\
+		v4->sin_family = AF_INET;				\
+		v4->sin_port = inet->inet_dport;			\
+		v4->sin_addr.s_addr = inet->inet_daddr;			\
+	} while (0)
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+#define TP_STORE_ADDR_PORTS(__entry, inet, sk)				\
+	do {								\
+		if (sk->sk_family == AF_INET6) {			\
+			struct sockaddr_in6 *v6 = (void *)__entry->saddr; \
+									\
+			v6->sin6_family = AF_INET6;			\
+			v6->sin6_port = inet->inet_sport;		\
+			v6->sin6_addr = inet6_sk(sk)->saddr;		\
+			v6 = (void *)__entry->daddr;			\
+			v6->sin6_family = AF_INET6;			\
+			v6->sin6_port = inet->inet_dport;		\
+			v6->sin6_addr = sk->sk_v6_daddr;		\
+		} else							\
+			TP_STORE_ADDR_PORTS_V4(__entry, inet, sk);	\
+	} while (0)
+
+#else
+
+#define TP_STORE_ADDR_PORTS(__entry, inet, sk)		\
+	TP_STORE_ADDR_PORTS_V4(__entry, inet, sk);
+
+#endif
+
+TRACE_EVENT(tcp_probe,
+
+	TP_PROTO(struct sock *sk, struct sk_buff *skb),
+
+	TP_ARGS(sk, skb),
+
+	TP_STRUCT__entry(
+		/* sockaddr_in6 is always bigger than sockaddr_in */
+		__array(__u8, saddr, sizeof(struct sockaddr_in6))
+		__array(__u8, daddr, sizeof(struct sockaddr_in6))
+		__field(__u16, sport)
+		__field(__u16, dport)
+		__field(__u32, mark)
+		__field(__u16, length)
+		__field(__u32, snd_nxt)
+		__field(__u32, snd_una)
+		__field(__u32, snd_cwnd)
+		__field(__u32, ssthresh)
+		__field(__u32, snd_wnd)
+		__field(__u32, srtt)
+		__field(__u32, rcv_wnd)
+	),
+
+	TP_fast_assign(
+		const struct tcp_sock *tp = tcp_sk(sk);
+		const struct inet_sock *inet = inet_sk(sk);
+
+		memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
+		memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
+
+		TP_STORE_ADDR_PORTS(__entry, inet, sk);
+
+		/* For filtering use */
+		__entry->sport = ntohs(inet->inet_sport);
+		__entry->dport = ntohs(inet->inet_dport);
+		__entry->mark = skb->mark;
+
+		__entry->length = skb->len;
+		__entry->snd_nxt = tp->snd_nxt;
+		__entry->snd_una = tp->snd_una;
+		__entry->snd_cwnd = tp->snd_cwnd;
+		__entry->snd_wnd = tp->snd_wnd;
+		__entry->rcv_wnd = tp->rcv_wnd;
+		__entry->ssthresh = tcp_current_ssthresh(sk);
+		__entry->srtt = tp->srtt_us >> 3;
+	),
+
+	TP_printk("src=%pISpc dest=%pISpc mark=%#x length=%d snd_nxt=%#x "
+		  "snd_una=%#x snd_cwnd=%u ssthresh=%u snd_wnd=%u srtt=%u "
+		  "rcv_wnd=%u",
+		  __entry->saddr, __entry->daddr, __entry->mark,
+		  __entry->length, __entry->snd_nxt, __entry->snd_una,
+		  __entry->snd_cwnd, __entry->ssthresh, __entry->snd_wnd,
+		  __entry->srtt, __entry->rcv_wnd)
+);
+
 #endif /* _TRACE_TCP_H */
 
 /* This part must be outside protection */
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4d55c4b338ee..ff71b18d9682 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5299,6 +5299,9 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 	unsigned int len = skb->len;
 	struct tcp_sock *tp = tcp_sk(sk);
 
+	/* TCP congestion window tracking */
+	trace_tcp_probe(sk, skb);
+
 	tcp_mstamp_refresh(tp);
 	if (unlikely(!sk->sk_rx_dst))
 		inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb);

[PATCH net-next v6 2/6] net: tcp: Remove TCP probe module

[Masami Hiramatsu]

Remove TCP probe module since jprobe has been deprecated.
That function is now replaced by tcp/tcp_probe trace-event.
You can use it via ftrace or perftools.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 net/Kconfig          |   17 ---
 net/ipv4/Makefile    |    1 
 net/ipv4/tcp_probe.c |  301 --------------------------------------------------
 3 files changed, 319 deletions(-)
 delete mode 100644 net/ipv4/tcp_probe.c

diff --git a/net/Kconfig b/net/Kconfig
index 9dba2715919d..efe930db3c08 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -336,23 +336,6 @@ config NET_PKTGEN
 	  To compile this code as a module, choose M here: the
 	  module will be called pktgen.
 
-config NET_TCPPROBE
-	tristate "TCP connection probing"
-	depends on INET && PROC_FS && KPROBES
-	---help---
-	This module allows for capturing the changes to TCP connection
-	state in response to incoming packets. It is used for debugging
-	TCP congestion avoidance modules. If you don't understand
-	what was just said, you don't need it: say N.
-
-	Documentation on how to use TCP connection probing can be found
-	at:
-	
-	  http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
-
-	To compile this code as a module, choose M here: the
-	module will be called tcp_probe.
-
 config NET_DROP_MONITOR
 	tristate "Network packet drop alerting service"
 	depends on INET && TRACEPOINTS
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index c6c8ad1d4b6d..47a0a6649a9d 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -43,7 +43,6 @@ obj-$(CONFIG_INET_DIAG) += inet_diag.o
 obj-$(CONFIG_INET_TCP_DIAG) += tcp_diag.o
 obj-$(CONFIG_INET_UDP_DIAG) += udp_diag.o
 obj-$(CONFIG_INET_RAW_DIAG) += raw_diag.o
-obj-$(CONFIG_NET_TCPPROBE) += tcp_probe.o
 obj-$(CONFIG_TCP_CONG_BBR) += tcp_bbr.o
 obj-$(CONFIG_TCP_CONG_BIC) += tcp_bic.o
 obj-$(CONFIG_TCP_CONG_CDG) += tcp_cdg.o
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
deleted file mode 100644
index 697f4c67b2e3..000000000000
--- a/net/ipv4/tcp_probe.c
+++ /dev/null
@@ -1,301 +0,0 @@
-/*
- * tcpprobe - Observe the TCP flow with kprobes.
- *
- * The idea for this came from Werner Almesberger's umlsim
- * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/socket.h>
-#include <linux/tcp.h>
-#include <linux/slab.h>
-#include <linux/proc_fs.h>
-#include <linux/module.h>
-#include <linux/ktime.h>
-#include <linux/time.h>
-#include <net/net_namespace.h>
-
-#include <net/tcp.h>
-
-MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
-MODULE_DESCRIPTION("TCP cwnd snooper");
-MODULE_LICENSE("GPL");
-MODULE_VERSION("1.1");
-
-static int port __read_mostly;
-MODULE_PARM_DESC(port, "Port to match (0=all)");
-module_param(port, int, 0);
-
-static unsigned int bufsize __read_mostly = 4096;
-MODULE_PARM_DESC(bufsize, "Log buffer size in packets (4096)");
-module_param(bufsize, uint, 0);
-
-static unsigned int fwmark __read_mostly;
-MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)");
-module_param(fwmark, uint, 0);
-
-static int full __read_mostly;
-MODULE_PARM_DESC(full, "Full log (1=every ack packet received,  0=only cwnd changes)");
-module_param(full, int, 0);
-
-static const char procname[] = "tcpprobe";
-
-struct tcp_log {
-	ktime_t tstamp;
-	union {
-		struct sockaddr		raw;
-		struct sockaddr_in	v4;
-		struct sockaddr_in6	v6;
-	}	src, dst;
-	u16	length;
-	u32	snd_nxt;
-	u32	snd_una;
-	u32	snd_wnd;
-	u32	rcv_wnd;
-	u32	snd_cwnd;
-	u32	ssthresh;
-	u32	srtt;
-};
-
-static struct {
-	spinlock_t	lock;
-	wait_queue_head_t wait;
-	ktime_t		start;
-	u32		lastcwnd;
-
-	unsigned long	head, tail;
-	struct tcp_log	*log;
-} tcp_probe;
-
-static inline int tcp_probe_used(void)
-{
-	return (tcp_probe.head - tcp_probe.tail) & (bufsize - 1);
-}
-
-static inline int tcp_probe_avail(void)
-{
-	return bufsize - tcp_probe_used() - 1;
-}
-
-#define tcp_probe_copy_fl_to_si4(inet, si4, mem)		\
-	do {							\
-		si4.sin_family = AF_INET;			\
-		si4.sin_port = inet->inet_##mem##port;		\
-		si4.sin_addr.s_addr = inet->inet_##mem##addr;	\
-	} while (0)						\
-
-/*
- * Hook inserted to be called before each receive packet.
- * Note: arguments must match tcp_rcv_established()!
- */
-static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
-				 const struct tcphdr *th)
-{
-	unsigned int len = skb->len;
-	const struct tcp_sock *tp = tcp_sk(sk);
-	const struct inet_sock *inet = inet_sk(sk);
-
-	/* Only update if port or skb mark matches */
-	if (((port == 0 && fwmark == 0) ||
-	     ntohs(inet->inet_dport) == port ||
-	     ntohs(inet->inet_sport) == port ||
-	     (fwmark > 0 && skb->mark == fwmark)) &&
-	    (full || tp->snd_cwnd != tcp_probe.lastcwnd)) {
-
-		spin_lock(&tcp_probe.lock);
-		/* If log fills, just silently drop */
-		if (tcp_probe_avail() > 1) {
-			struct tcp_log *p = tcp_probe.log + tcp_probe.head;
-
-			p->tstamp = ktime_get();
-			switch (sk->sk_family) {
-			case AF_INET:
-				tcp_probe_copy_fl_to_si4(inet, p->src.v4, s);
-				tcp_probe_copy_fl_to_si4(inet, p->dst.v4, d);
-				break;
-			case AF_INET6:
-				memset(&p->src.v6, 0, sizeof(p->src.v6));
-				memset(&p->dst.v6, 0, sizeof(p->dst.v6));
-#if IS_ENABLED(CONFIG_IPV6)
-				p->src.v6.sin6_family = AF_INET6;
-				p->src.v6.sin6_port = inet->inet_sport;
-				p->src.v6.sin6_addr = inet6_sk(sk)->saddr;
-
-				p->dst.v6.sin6_family = AF_INET6;
-				p->dst.v6.sin6_port = inet->inet_dport;
-				p->dst.v6.sin6_addr = sk->sk_v6_daddr;
-#endif
-				break;
-			default:
-				BUG();
-			}
-
-			p->length = len;
-			p->snd_nxt = tp->snd_nxt;
-			p->snd_una = tp->snd_una;
-			p->snd_cwnd = tp->snd_cwnd;
-			p->snd_wnd = tp->snd_wnd;
-			p->rcv_wnd = tp->rcv_wnd;
-			p->ssthresh = tcp_current_ssthresh(sk);
-			p->srtt = tp->srtt_us >> 3;
-
-			tcp_probe.head = (tcp_probe.head + 1) & (bufsize - 1);
-		}
-		tcp_probe.lastcwnd = tp->snd_cwnd;
-		spin_unlock(&tcp_probe.lock);
-
-		wake_up(&tcp_probe.wait);
-	}
-
-	jprobe_return();
-}
-
-static struct jprobe tcp_jprobe = {
-	.kp = {
-		.symbol_name	= "tcp_rcv_established",
-	},
-	.entry	= jtcp_rcv_established,
-};
-
-static int tcpprobe_open(struct inode *inode, struct file *file)
-{
-	/* Reset (empty) log */
-	spin_lock_bh(&tcp_probe.lock);
-	tcp_probe.head = tcp_probe.tail = 0;
-	tcp_probe.start = ktime_get();
-	spin_unlock_bh(&tcp_probe.lock);
-
-	return 0;
-}
-
-static int tcpprobe_sprint(char *tbuf, int n)
-{
-	const struct tcp_log *p
-		= tcp_probe.log + tcp_probe.tail;
-	struct timespec64 ts
-		= ktime_to_timespec64(ktime_sub(p->tstamp, tcp_probe.start));
-
-	return scnprintf(tbuf, n,
-			"%lu.%09lu %pISpc %pISpc %d %#x %#x %u %u %u %u %u\n",
-			(unsigned long)ts.tv_sec,
-			(unsigned long)ts.tv_nsec,
-			&p->src, &p->dst, p->length, p->snd_nxt, p->snd_una,
-			p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt, p->rcv_wnd);
-}
-
-static ssize_t tcpprobe_read(struct file *file, char __user *buf,
-			     size_t len, loff_t *ppos)
-{
-	int error = 0;
-	size_t cnt = 0;
-
-	if (!buf)
-		return -EINVAL;
-
-	while (cnt < len) {
-		char tbuf[256];
-		int width;
-
-		/* Wait for data in buffer */
-		error = wait_event_interruptible(tcp_probe.wait,
-						 tcp_probe_used() > 0);
-		if (error)
-			break;
-
-		spin_lock_bh(&tcp_probe.lock);
-		if (tcp_probe.head == tcp_probe.tail) {
-			/* multiple readers race? */
-			spin_unlock_bh(&tcp_probe.lock);
-			continue;
-		}
-
-		width = tcpprobe_sprint(tbuf, sizeof(tbuf));
-
-		if (cnt + width < len)
-			tcp_probe.tail = (tcp_probe.tail + 1) & (bufsize - 1);
-
-		spin_unlock_bh(&tcp_probe.lock);
-
-		/* if record greater than space available
-		   return partial buffer (so far) */
-		if (cnt + width >= len)
-			break;
-
-		if (copy_to_user(buf + cnt, tbuf, width))
-			return -EFAULT;
-		cnt += width;
-	}
-
-	return cnt == 0 ? error : cnt;
-}
-
-static const struct file_operations tcpprobe_fops = {
-	.owner	 = THIS_MODULE,
-	.open	 = tcpprobe_open,
-	.read    = tcpprobe_read,
-	.llseek  = noop_llseek,
-};
-
-static __init int tcpprobe_init(void)
-{
-	int ret = -ENOMEM;
-
-	/* Warning: if the function signature of tcp_rcv_established,
-	 * has been changed, you also have to change the signature of
-	 * jtcp_rcv_established, otherwise you end up right here!
-	 */
-	BUILD_BUG_ON(__same_type(tcp_rcv_established,
-				 jtcp_rcv_established) == 0);
-
-	init_waitqueue_head(&tcp_probe.wait);
-	spin_lock_init(&tcp_probe.lock);
-
-	if (bufsize == 0)
-		return -EINVAL;
-
-	bufsize = roundup_pow_of_two(bufsize);
-	tcp_probe.log = kcalloc(bufsize, sizeof(struct tcp_log), GFP_KERNEL);
-	if (!tcp_probe.log)
-		goto err0;
-
-	if (!proc_create(procname, S_IRUSR, init_net.proc_net, &tcpprobe_fops))
-		goto err0;
-
-	ret = register_jprobe(&tcp_jprobe);
-	if (ret)
-		goto err1;
-
-	pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n",
-		port, fwmark, bufsize);
-	return 0;
- err1:
-	remove_proc_entry(procname, init_net.proc_net);
- err0:
-	kfree(tcp_probe.log);
-	return ret;
-}
-module_init(tcpprobe_init);
-
-static __exit void tcpprobe_exit(void)
-{
-	remove_proc_entry(procname, init_net.proc_net);
-	unregister_jprobe(&tcp_jprobe);
-	kfree(tcp_probe.log);
-}
-module_exit(tcpprobe_exit);

[PATCH net-next v6 3/6] net: sctp: Add SCTP ACK tracking trace event

[Masami Hiramatsu]

Add SCTP ACK tracking trace event to trace the changes of SCTP
association state in response to incoming packets.
It is used for debugging SCTP congestion control algorithms,
and will replace sctp_probe module.

Note that this event a bit tricky. Since this consists of 2
events (sctp_probe and sctp_probe_path) so you have to enable
both events as below.

  # cd /sys/kernel/debug/tracing
  # echo 1 > events/sctp/sctp_probe/enable
  # echo 1 > events/sctp/sctp_probe_path/enable

Or, you can enable all the events under sctp.

  # echo 1 > events/sctp/enable

Since sctp_probe_path event is always invoked from sctp_probe
event, you can not see any output if you only enable
sctp_probe_path.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
  Changes in v3:
   - Add checking whether sctp_probe_path event is enabled
     before iterating sctp paths to record. Thanks Steven.
  Changes in v4:
   - Move a temporal variable definition in the block.
   - Fix to cast pointer to unsigned long instead of __u64
     for 32bit environment.
---
 include/trace/events/sctp.h |   99 +++++++++++++++++++++++++++++++++++++++++++
 net/sctp/sm_statefuns.c     |    5 ++
 2 files changed, 104 insertions(+)
 create mode 100644 include/trace/events/sctp.h

diff --git a/include/trace/events/sctp.h b/include/trace/events/sctp.h
new file mode 100644
index 000000000000..7475c7be165a
--- /dev/null
+++ b/include/trace/events/sctp.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sctp
+
+#if !defined(_TRACE_SCTP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SCTP_H
+
+#include <net/sctp/structs.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(sctp_probe_path,
+
+	TP_PROTO(struct sctp_transport *sp,
+		 const struct sctp_association *asoc),
+
+	TP_ARGS(sp, asoc),
+
+	TP_STRUCT__entry(
+		__field(__u64, asoc)
+		__field(__u32, primary)
+		__array(__u8, ipaddr, sizeof(union sctp_addr))
+		__field(__u32, state)
+		__field(__u32, cwnd)
+		__field(__u32, ssthresh)
+		__field(__u32, flight_size)
+		__field(__u32, partial_bytes_acked)
+		__field(__u32, pathmtu)
+	),
+
+	TP_fast_assign(
+		__entry->asoc = (unsigned long)asoc;
+		__entry->primary = (sp == asoc->peer.primary_path);
+		memcpy(__entry->ipaddr, &sp->ipaddr, sizeof(union sctp_addr));
+		__entry->state = sp->state;
+		__entry->cwnd = sp->cwnd;
+		__entry->ssthresh = sp->ssthresh;
+		__entry->flight_size = sp->flight_size;
+		__entry->partial_bytes_acked = sp->partial_bytes_acked;
+		__entry->pathmtu = sp->pathmtu;
+	),
+
+	TP_printk("asoc=%#llx%s ipaddr=%pISpc state=%u cwnd=%u ssthresh=%u "
+		  "flight_size=%u partial_bytes_acked=%u pathmtu=%u",
+		  __entry->asoc, __entry->primary ? "(*)" : "",
+		  __entry->ipaddr, __entry->state, __entry->cwnd,
+		  __entry->ssthresh, __entry->flight_size,
+		  __entry->partial_bytes_acked, __entry->pathmtu)
+);
+
+TRACE_EVENT(sctp_probe,
+
+	TP_PROTO(const struct sctp_endpoint *ep,
+		 const struct sctp_association *asoc,
+		 struct sctp_chunk *chunk),
+
+	TP_ARGS(ep, asoc, chunk),
+
+	TP_STRUCT__entry(
+		__field(__u64, asoc)
+		__field(__u32, mark)
+		__field(__u16, bind_port)
+		__field(__u16, peer_port)
+		__field(__u32, pathmtu)
+		__field(__u32, rwnd)
+		__field(__u16, unack_data)
+	),
+
+	TP_fast_assign(
+		struct sk_buff *skb = chunk->skb;
+
+		__entry->asoc = (unsigned long)asoc;
+		__entry->mark = skb->mark;
+		__entry->bind_port = ep->base.bind_addr.port;
+		__entry->peer_port = asoc->peer.port;
+		__entry->pathmtu = asoc->pathmtu;
+		__entry->rwnd = asoc->peer.rwnd;
+		__entry->unack_data = asoc->unack_data;
+
+		if (trace_sctp_probe_path_enabled()) {
+			struct sctp_transport *sp;
+
+			list_for_each_entry(sp, &asoc->peer.transport_addr_list,
+					    transports) {
+				trace_sctp_probe_path(sp, asoc);
+			}
+		}
+	),
+
+	TP_printk("asoc=%#llx mark=%#x bind_port=%d peer_port=%d pathmtu=%d "
+		  "rwnd=%u unack_data=%d",
+		  __entry->asoc, __entry->mark, __entry->bind_port,
+		  __entry->peer_port, __entry->pathmtu, __entry->rwnd,
+		  __entry->unack_data)
+);
+
+#endif /* _TRACE_SCTP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 541f34735346..eb7905ffe5f2 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -59,6 +59,9 @@
 #include <net/sctp/sm.h>
 #include <net/sctp/structs.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/sctp.h>
+
 static struct sctp_packet *sctp_abort_pkt_new(
 					struct net *net,
 					const struct sctp_endpoint *ep,
@@ -3219,6 +3222,8 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
 	struct sctp_sackhdr *sackh;
 	__u32 ctsn;
 
+	trace_sctp_probe(ep, asoc, chunk);
+
 	if (!sctp_vtag_verify(chunk, asoc))
 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
 

[PATCH net-next v6 4/6] net: sctp: Remove debug SCTP probe module

[Masami Hiramatsu]

Remove SCTP probe module since jprobe has been deprecated.
That function is now replaced by sctp/sctp_probe and
sctp/sctp_probe_path trace-events.
You can use it via ftrace or perftools.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 net/sctp/Kconfig  |   12 ---
 net/sctp/Makefile |    3 -
 net/sctp/probe.c  |  244 -----------------------------------------------------
 3 files changed, 259 deletions(-)
 delete mode 100644 net/sctp/probe.c

diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
index d9c04dc1b3f3..c740b189d4ba 100644
--- a/net/sctp/Kconfig
+++ b/net/sctp/Kconfig
@@ -37,18 +37,6 @@ menuconfig IP_SCTP
 
 if IP_SCTP
 
-config NET_SCTPPROBE
-	tristate "SCTP: Association probing"
-        depends on PROC_FS && KPROBES
-        ---help---
-        This module allows for capturing the changes to SCTP association
-        state in response to incoming packets. It is used for debugging
-        SCTP congestion control algorithms. If you don't understand
-        what was just said, you don't need it: say N.
-
-        To compile this code as a module, choose M here: the
-        module will be called sctp_probe.
-
 config SCTP_DBG_OBJCNT
 	bool "SCTP: Debug object counts"
 	depends on PROC_FS
diff --git a/net/sctp/Makefile b/net/sctp/Makefile
index 54bd9c1a8aa1..6776582ec449 100644
--- a/net/sctp/Makefile
+++ b/net/sctp/Makefile
@@ -4,7 +4,6 @@
 #
 
 obj-$(CONFIG_IP_SCTP) += sctp.o
-obj-$(CONFIG_NET_SCTPPROBE) += sctp_probe.o
 obj-$(CONFIG_INET_SCTP_DIAG) += sctp_diag.o
 
 sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
@@ -16,8 +15,6 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
 	  offload.o stream_sched.o stream_sched_prio.o \
 	  stream_sched_rr.o stream_interleave.o
 
-sctp_probe-y := probe.o
-
 sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
 sctp-$(CONFIG_PROC_FS) += proc.o
 sctp-$(CONFIG_SYSCTL) += sysctl.o
diff --git a/net/sctp/probe.c b/net/sctp/probe.c
deleted file mode 100644
index 1280f85a598d..000000000000
--- a/net/sctp/probe.c
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- * sctp_probe - Observe the SCTP flow with kprobes.
- *
- * The idea for this came from Werner Almesberger's umlsim
- * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
- *
- * Modified for SCTP from Stephen Hemminger's code
- * Copyright (C) 2010, Wei Yongjun <yjwei@cn.fujitsu.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/socket.h>
-#include <linux/sctp.h>
-#include <linux/proc_fs.h>
-#include <linux/vmalloc.h>
-#include <linux/module.h>
-#include <linux/kfifo.h>
-#include <linux/time.h>
-#include <net/net_namespace.h>
-
-#include <net/sctp/sctp.h>
-#include <net/sctp/sm.h>
-
-MODULE_SOFTDEP("pre: sctp");
-MODULE_AUTHOR("Wei Yongjun <yjwei@cn.fujitsu.com>");
-MODULE_DESCRIPTION("SCTP snooper");
-MODULE_LICENSE("GPL");
-
-static int port __read_mostly = 0;
-MODULE_PARM_DESC(port, "Port to match (0=all)");
-module_param(port, int, 0);
-
-static unsigned int fwmark __read_mostly = 0;
-MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)");
-module_param(fwmark, uint, 0);
-
-static int bufsize __read_mostly = 64 * 1024;
-MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
-module_param(bufsize, int, 0);
-
-static int full __read_mostly = 1;
-MODULE_PARM_DESC(full, "Full log (1=every ack packet received,  0=only cwnd changes)");
-module_param(full, int, 0);
-
-static const char procname[] = "sctpprobe";
-
-static struct {
-	struct kfifo	  fifo;
-	spinlock_t	  lock;
-	wait_queue_head_t wait;
-	struct timespec64 tstart;
-} sctpw;
-
-static __printf(1, 2) void printl(const char *fmt, ...)
-{
-	va_list args;
-	int len;
-	char tbuf[256];
-
-	va_start(args, fmt);
-	len = vscnprintf(tbuf, sizeof(tbuf), fmt, args);
-	va_end(args);
-
-	kfifo_in_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
-	wake_up(&sctpw.wait);
-}
-
-static int sctpprobe_open(struct inode *inode, struct file *file)
-{
-	kfifo_reset(&sctpw.fifo);
-	ktime_get_ts64(&sctpw.tstart);
-
-	return 0;
-}
-
-static ssize_t sctpprobe_read(struct file *file, char __user *buf,
-			      size_t len, loff_t *ppos)
-{
-	int error = 0, cnt = 0;
-	unsigned char *tbuf;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (len == 0)
-		return 0;
-
-	tbuf = vmalloc(len);
-	if (!tbuf)
-		return -ENOMEM;
-
-	error = wait_event_interruptible(sctpw.wait,
-					 kfifo_len(&sctpw.fifo) != 0);
-	if (error)
-		goto out_free;
-
-	cnt = kfifo_out_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
-	error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
-
-out_free:
-	vfree(tbuf);
-
-	return error ? error : cnt;
-}
-
-static const struct file_operations sctpprobe_fops = {
-	.owner	= THIS_MODULE,
-	.open	= sctpprobe_open,
-	.read	= sctpprobe_read,
-	.llseek = noop_llseek,
-};
-
-static enum sctp_disposition jsctp_sf_eat_sack(
-					struct net *net,
-					const struct sctp_endpoint *ep,
-					const struct sctp_association *asoc,
-					const union sctp_subtype type,
-					void *arg,
-					struct sctp_cmd_seq *commands)
-{
-	struct sctp_chunk *chunk = arg;
-	struct sk_buff *skb = chunk->skb;
-	struct sctp_transport *sp;
-	static __u32 lcwnd = 0;
-	struct timespec64 now;
-
-	sp = asoc->peer.primary_path;
-
-	if (((port == 0 && fwmark == 0) ||
-	     asoc->peer.port == port ||
-	     ep->base.bind_addr.port == port ||
-	     (fwmark > 0 && skb->mark == fwmark)) &&
-	    (full || sp->cwnd != lcwnd)) {
-		lcwnd = sp->cwnd;
-
-		ktime_get_ts64(&now);
-		now = timespec64_sub(now, sctpw.tstart);
-
-		printl("%lu.%06lu ", (unsigned long) now.tv_sec,
-		       (unsigned long) now.tv_nsec / NSEC_PER_USEC);
-
-		printl("%p %5d %5d %5d %8d %5d ", asoc,
-		       ep->base.bind_addr.port, asoc->peer.port,
-		       asoc->pathmtu, asoc->peer.rwnd, asoc->unack_data);
-
-		list_for_each_entry(sp, &asoc->peer.transport_addr_list,
-					transports) {
-			if (sp == asoc->peer.primary_path)
-				printl("*");
-
-			printl("%pISc %2u %8u %8u %8u %8u %8u ",
-			       &sp->ipaddr, sp->state, sp->cwnd, sp->ssthresh,
-			       sp->flight_size, sp->partial_bytes_acked,
-			       sp->pathmtu);
-		}
-		printl("\n");
-	}
-
-	jprobe_return();
-	return 0;
-}
-
-static struct jprobe sctp_recv_probe = {
-	.kp	= {
-		.symbol_name = "sctp_sf_eat_sack_6_2",
-	},
-	.entry	= jsctp_sf_eat_sack,
-};
-
-static __init int sctp_setup_jprobe(void)
-{
-	int ret = register_jprobe(&sctp_recv_probe);
-
-	if (ret) {
-		if (request_module("sctp"))
-			goto out;
-		ret = register_jprobe(&sctp_recv_probe);
-	}
-
-out:
-	return ret;
-}
-
-static __init int sctpprobe_init(void)
-{
-	int ret = -ENOMEM;
-
-	/* Warning: if the function signature of sctp_sf_eat_sack_6_2,
-	 * has been changed, you also have to change the signature of
-	 * jsctp_sf_eat_sack, otherwise you end up right here!
-	 */
-	BUILD_BUG_ON(__same_type(sctp_sf_eat_sack_6_2,
-				 jsctp_sf_eat_sack) == 0);
-
-	init_waitqueue_head(&sctpw.wait);
-	spin_lock_init(&sctpw.lock);
-	if (kfifo_alloc(&sctpw.fifo, bufsize, GFP_KERNEL))
-		return ret;
-
-	if (!proc_create(procname, S_IRUSR, init_net.proc_net,
-			 &sctpprobe_fops))
-		goto free_kfifo;
-
-	ret = sctp_setup_jprobe();
-	if (ret)
-		goto remove_proc;
-
-	pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n",
-		port, fwmark, bufsize);
-	return 0;
-
-remove_proc:
-	remove_proc_entry(procname, init_net.proc_net);
-free_kfifo:
-	kfifo_free(&sctpw.fifo);
-	return ret;
-}
-
-static __exit void sctpprobe_exit(void)
-{
-	kfifo_free(&sctpw.fifo);
-	remove_proc_entry(procname, init_net.proc_net);
-	unregister_jprobe(&sctp_recv_probe);
-}
-
-module_init(sctpprobe_init);
-module_exit(sctpprobe_exit);

[PATCH net-next v6 5/6] net: dccp: Add DCCP sendmsg trace event

[Masami Hiramatsu]

Add DCCP sendmsg trace event (dccp/dccp_probe) for
replacing dccpprobe. User can trace this event via
ftrace or perftools.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
  Changes in v5
   - Fix to add local directory to include for trace.h.
     Thanks Steven!
---
 net/dccp/Makefile |    3 ++
 net/dccp/proto.c  |    5 +++
 net/dccp/trace.h  |  105 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 113 insertions(+)
 create mode 100644 net/dccp/trace.h

diff --git a/net/dccp/Makefile b/net/dccp/Makefile
index 2e7b56097bc4..4215f13a63af 100644
--- a/net/dccp/Makefile
+++ b/net/dccp/Makefile
@@ -27,3 +27,6 @@ dccp-$(CONFIG_SYSCTL) += sysctl.o
 
 dccp_diag-y := diag.o
 dccp_probe-y := probe.o
+
+# build with local directory for trace.h
+CFLAGS_proto.o := -I$(src)
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 7a75a1d3568b..fa7e92e08920 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -38,6 +38,9 @@
 #include "dccp.h"
 #include "feat.h"
 
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
 DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
 
 EXPORT_SYMBOL_GPL(dccp_statistics);
@@ -761,6 +764,8 @@ int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	int rc, size;
 	long timeo;
 
+	trace_dccp_probe(sk, len);
+
 	if (len > dp->dccps_mss_cache)
 		return -EMSGSIZE;
 
diff --git a/net/dccp/trace.h b/net/dccp/trace.h
new file mode 100644
index 000000000000..aa01321a6c37
--- /dev/null
+++ b/net/dccp/trace.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM dccp
+
+#if !defined(_TRACE_DCCP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DCCP_H
+
+#include <net/sock.h>
+#include "dccp.h"
+#include "ccids/ccid3.h"
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(dccp_probe,
+
+	TP_PROTO(struct sock *sk, size_t size),
+
+	TP_ARGS(sk, size),
+
+	TP_STRUCT__entry(
+		/* sockaddr_in6 is always bigger than sockaddr_in */
+		__array(__u8, saddr, sizeof(struct sockaddr_in6))
+		__array(__u8, daddr, sizeof(struct sockaddr_in6))
+		__field(__u16, sport)
+		__field(__u16, dport)
+		__field(__u16, size)
+		__field(__u16, tx_s)
+		__field(__u32, tx_rtt)
+		__field(__u32, tx_p)
+		__field(__u32, tx_x_calc)
+		__field(__u64, tx_x_recv)
+		__field(__u64, tx_x)
+		__field(__u32, tx_t_ipi)
+	),
+
+	TP_fast_assign(
+		const struct inet_sock *inet = inet_sk(sk);
+		struct ccid3_hc_tx_sock *hc = NULL;
+
+		if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
+			hc = ccid3_hc_tx_sk(sk);
+
+		memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
+		memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
+
+		if (sk->sk_family == AF_INET) {
+			struct sockaddr_in *v4 = (void *)__entry->saddr;
+
+			v4->sin_family = AF_INET;
+			v4->sin_port = inet->inet_sport;
+			v4->sin_addr.s_addr = inet->inet_saddr;
+			v4 = (void *)__entry->daddr;
+			v4->sin_family = AF_INET;
+			v4->sin_port = inet->inet_dport;
+			v4->sin_addr.s_addr = inet->inet_daddr;
+#if IS_ENABLED(CONFIG_IPV6)
+		} else if (sk->sk_family == AF_INET6) {
+			struct sockaddr_in6 *v6 = (void *)__entry->saddr;
+
+			v6->sin6_family = AF_INET6;
+			v6->sin6_port = inet->inet_sport;
+			v6->sin6_addr = inet6_sk(sk)->saddr;
+			v6 = (void *)__entry->daddr;
+			v6->sin6_family = AF_INET6;
+			v6->sin6_port = inet->inet_dport;
+			v6->sin6_addr = sk->sk_v6_daddr;
+#endif
+		}
+
+		/* For filtering use */
+		__entry->sport = ntohs(inet->inet_sport);
+		__entry->dport = ntohs(inet->inet_dport);
+
+		__entry->size = size;
+		if (hc) {
+			__entry->tx_s = hc->tx_s;
+			__entry->tx_rtt = hc->tx_rtt;
+			__entry->tx_p = hc->tx_p;
+			__entry->tx_x_calc = hc->tx_x_calc;
+			__entry->tx_x_recv = hc->tx_x_recv >> 6;
+			__entry->tx_x = hc->tx_x >> 6;
+			__entry->tx_t_ipi = hc->tx_t_ipi;
+		} else {
+			__entry->tx_s = 0;
+			memset(&__entry->tx_rtt, 0, (void *)&__entry->tx_t_ipi -
+			       (void *)&__entry->tx_rtt +
+			       sizeof(__entry->tx_t_ipi));
+		}
+	),
+
+	TP_printk("src=%pISpc dest=%pISpc size=%d tx_s=%d tx_rtt=%d "
+		  "tx_p=%d tx_x_calc=%u tx_x_recv=%llu tx_x=%llu tx_t_ipi=%d",
+		  __entry->saddr, __entry->daddr, __entry->size,
+		  __entry->tx_s, __entry->tx_rtt, __entry->tx_p,
+		  __entry->tx_x_calc, __entry->tx_x_recv, __entry->tx_x,
+		  __entry->tx_t_ipi)
+);
+
+#endif /* _TRACE_TCP_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+#include <trace/define_trace.h>

[PATCH net-next v6 6/6] net: dccp: Remove dccpprobe module

[Masami Hiramatsu]

Remove DCCP probe module since jprobe has been deprecated.
That function is now replaced by dccp/dccp_probe trace-event.
You can use it via ftrace or perftools.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v5:
  - Fix a conflict with previous change in Makefile.
---
 net/dccp/Kconfig  |   17 ----
 net/dccp/Makefile |    2 -
 net/dccp/probe.c  |  203 -----------------------------------------------------
 3 files changed, 222 deletions(-)
 delete mode 100644 net/dccp/probe.c

diff --git a/net/dccp/Kconfig b/net/dccp/Kconfig
index 8c0ef71bed2f..b270e84d9c13 100644
--- a/net/dccp/Kconfig
+++ b/net/dccp/Kconfig
@@ -39,23 +39,6 @@ config IP_DCCP_DEBUG
 
 	  Just say N.
 
-config NET_DCCPPROBE
-	tristate "DCCP connection probing"
-	depends on PROC_FS && KPROBES
-	---help---
-	This module allows for capturing the changes to DCCP connection
-	state in response to incoming packets. It is used for debugging
-	DCCP congestion avoidance modules. If you don't understand
-	what was just said, you don't need it: say N.
-
-	Documentation on how to use DCCP connection probing can be found
-	at:
-	
-	  http://www.linuxfoundation.org/collaborate/workgroups/networking/dccpprobe
-
-	To compile this code as a module, choose M here: the
-	module will be called dccp_probe.
-
 
 endmenu
 
diff --git a/net/dccp/Makefile b/net/dccp/Makefile
index 4215f13a63af..5b4ff37bc806 100644
--- a/net/dccp/Makefile
+++ b/net/dccp/Makefile
@@ -21,12 +21,10 @@ obj-$(subst y,$(CONFIG_IP_DCCP),$(CONFIG_IPV6)) += dccp_ipv6.o
 dccp_ipv6-y := ipv6.o
 
 obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
-obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o
 
 dccp-$(CONFIG_SYSCTL) += sysctl.o
 
 dccp_diag-y := diag.o
-dccp_probe-y := probe.o
 
 # build with local directory for trace.h
 CFLAGS_proto.o := -I$(src)
diff --git a/net/dccp/probe.c b/net/dccp/probe.c
deleted file mode 100644
index 3d3fda05b32d..000000000000
--- a/net/dccp/probe.c
+++ /dev/null
@@ -1,203 +0,0 @@
-/*
- * dccp_probe - Observe the DCCP flow with kprobes.
- *
- * The idea for this came from Werner Almesberger's umlsim
- * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
- *
- * Modified for DCCP from Stephen Hemminger's code
- * Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/socket.h>
-#include <linux/dccp.h>
-#include <linux/proc_fs.h>
-#include <linux/module.h>
-#include <linux/kfifo.h>
-#include <linux/vmalloc.h>
-#include <linux/time64.h>
-#include <linux/gfp.h>
-#include <net/net_namespace.h>
-
-#include "dccp.h"
-#include "ccid.h"
-#include "ccids/ccid3.h"
-
-static int port;
-
-static int bufsize = 64 * 1024;
-
-static const char procname[] = "dccpprobe";
-
-static struct {
-	struct kfifo	  fifo;
-	spinlock_t	  lock;
-	wait_queue_head_t wait;
-	struct timespec64 tstart;
-} dccpw;
-
-static void printl(const char *fmt, ...)
-{
-	va_list args;
-	int len;
-	struct timespec64 now;
-	char tbuf[256];
-
-	va_start(args, fmt);
-	getnstimeofday64(&now);
-
-	now = timespec64_sub(now, dccpw.tstart);
-
-	len = sprintf(tbuf, "%lu.%06lu ",
-		      (unsigned long) now.tv_sec,
-		      (unsigned long) now.tv_nsec / NSEC_PER_USEC);
-	len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
-	va_end(args);
-
-	kfifo_in_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
-	wake_up(&dccpw.wait);
-}
-
-static int jdccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
-{
-	const struct inet_sock *inet = inet_sk(sk);
-	struct ccid3_hc_tx_sock *hc = NULL;
-
-	if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
-		hc = ccid3_hc_tx_sk(sk);
-
-	if (port == 0 || ntohs(inet->inet_dport) == port ||
-	    ntohs(inet->inet_sport) == port) {
-		if (hc)
-			printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n",
-			       &inet->inet_saddr, ntohs(inet->inet_sport),
-			       &inet->inet_daddr, ntohs(inet->inet_dport), size,
-			       hc->tx_s, hc->tx_rtt, hc->tx_p,
-			       hc->tx_x_calc, hc->tx_x_recv >> 6,
-			       hc->tx_x >> 6, hc->tx_t_ipi);
-		else
-			printl("%pI4:%u %pI4:%u %d\n",
-			       &inet->inet_saddr, ntohs(inet->inet_sport),
-			       &inet->inet_daddr, ntohs(inet->inet_dport),
-			       size);
-	}
-
-	jprobe_return();
-	return 0;
-}
-
-static struct jprobe dccp_send_probe = {
-	.kp	= {
-		.symbol_name = "dccp_sendmsg",
-	},
-	.entry	= jdccp_sendmsg,
-};
-
-static int dccpprobe_open(struct inode *inode, struct file *file)
-{
-	kfifo_reset(&dccpw.fifo);
-	getnstimeofday64(&dccpw.tstart);
-	return 0;
-}
-
-static ssize_t dccpprobe_read(struct file *file, char __user *buf,
-			      size_t len, loff_t *ppos)
-{
-	int error = 0, cnt = 0;
-	unsigned char *tbuf;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (len == 0)
-		return 0;
-
-	tbuf = vmalloc(len);
-	if (!tbuf)
-		return -ENOMEM;
-
-	error = wait_event_interruptible(dccpw.wait,
-					 kfifo_len(&dccpw.fifo) != 0);
-	if (error)
-		goto out_free;
-
-	cnt = kfifo_out_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
-	error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
-
-out_free:
-	vfree(tbuf);
-
-	return error ? error : cnt;
-}
-
-static const struct file_operations dccpprobe_fops = {
-	.owner	 = THIS_MODULE,
-	.open	 = dccpprobe_open,
-	.read    = dccpprobe_read,
-	.llseek  = noop_llseek,
-};
-
-static __init int dccpprobe_init(void)
-{
-	int ret = -ENOMEM;
-
-	init_waitqueue_head(&dccpw.wait);
-	spin_lock_init(&dccpw.lock);
-	if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
-		return ret;
-	if (!proc_create(procname, S_IRUSR, init_net.proc_net, &dccpprobe_fops))
-		goto err0;
-
-	ret = register_jprobe(&dccp_send_probe);
-	if (ret) {
-		ret = request_module("dccp");
-		if (!ret)
-			ret = register_jprobe(&dccp_send_probe);
-	}
-
-	if (ret)
-		goto err1;
-
-	pr_info("DCCP watch registered (port=%d)\n", port);
-	return 0;
-err1:
-	remove_proc_entry(procname, init_net.proc_net);
-err0:
-	kfifo_free(&dccpw.fifo);
-	return ret;
-}
-module_init(dccpprobe_init);
-
-static __exit void dccpprobe_exit(void)
-{
-	kfifo_free(&dccpw.fifo);
-	remove_proc_entry(procname, init_net.proc_net);
-	unregister_jprobe(&dccp_send_probe);
-
-}
-module_exit(dccpprobe_exit);
-
-MODULE_PARM_DESC(port, "Port to match (0=all)");
-module_param(port, int, 0);
-
-MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
-module_param(bufsize, int, 0);
-
-MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
-MODULE_DESCRIPTION("DCCP snooper");
-MODULE_LICENSE("GPL");

Re: [PATCH net-next v6 0/6] net: tcp: sctp: dccp: Replace jprobe usage with trace events

[David Miller]

From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Thu, 28 Dec 2017 15:10:00 +0900

> Changes from v5:
>   [1/6]: Avoid preprocessor directives in tracepoint macro args

Patch #1 is not the only patch which has this problem, at a minimum
patch #5 has it too.

Please audit the entire series for an issue when it is brought to your
attention.

Thank you.

Re: [PATCH net-next v6 0/6] net: tcp: sctp: dccp: Replace jprobe usage with trace events

[Masami Hiramatsu]

On Thu, 28 Dec 2017 12:06:13 -0500 (EST)
David Miller <davem@davemloft.net> wrote:

> From: Masami Hiramatsu <mhiramat@kernel.org>
> Date: Thu, 28 Dec 2017 15:10:00 +0900
> 
> > Changes from v5:
> >   [1/6]: Avoid preprocessor directives in tracepoint macro args
> 
> Patch #1 is not the only patch which has this problem, at a minimum
> patch #5 has it too.

Oops, sorry...

> Please audit the entire series for an issue when it is brought to your
> attention.

Thank you for your kindly advice.

> 
> Thank you.


-- 
Masami Hiramatsu <mhiramat@kernel.org>