Commit 6987990c authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by David S. Miller
Browse files

net: tcp: Remove TCP probe module 



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: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c3fde1bd

net/Kconfig

+0 −17
Original line number Diff line number Diff line
@@ -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

net/ipv4/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -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

net/ipv4/tcp_probe.c

deleted100644 → 0
+0 −301
Original line number Diff line number Diff line 
/*

 * 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);