sctp: implement sctp association probing module
This patch implement sctp association probing module, the module
will be called sctp_probe.
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.
Usage:
$ modprobe sctp_probe [full=n] [port=n] [bufsize=n]
$ cat /proc/net/sctpprobe
The output format is:
TIME ASSOC LPORT RPORT MTU RWND UNACK <REMOTE-ADDR STATE CWND SSTHRESH INFLIGHT PARTIAL_BYTES_ACKED MTU> ...
The output will be like this:
9.226086 c4064c48 9000 8000 1500 53352 1 *192.168.0.19 1 4380 54784 1252 0 1500
9.287195 c4064c48 9000 8000 1500 45144 5 *192.168.0.19 1 5880 54784 6500 0 1500
9.289130 c4064c48 9000 8000 1500 42724 5 *192.168.0.19 1 7380 54784 6500 0 1500
9.620332 c4064c48 9000 8000 1500 48284 4 *192.168.0.19 1 8880 54784 5200 0 1500
......
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Wei Yongjun
Vlad Yasevich
Родитель
ec7b951950
Коммит
787a51a087
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@ -37,6 +37,18 @@ menuconfig IP_SCTP
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if IP_SCTP
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config NET_SCTPPROBE
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tristate "SCTP: Association probing"
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depends on PROC_FS && KPROBES
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---help---
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This module allows for capturing the changes to SCTP association
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state in response to incoming packets. It is used for debugging
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SCTP congestion control algorithms. If you don't understand
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what was just said, you don't need it: say N.
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To compile this code as a module, choose M here: the
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module will be called sctp_probe.
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config SCTP_DBG_MSG
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bool "SCTP: Debug messages"
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help
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@ -3,6 +3,7 @@
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#
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obj-$(CONFIG_IP_SCTP) += sctp.o
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obj-$(CONFIG_NET_SCTPPROBE) += sctp_probe.o
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sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
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protocol.o endpointola.o associola.o \
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@ -11,6 +12,8 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
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tsnmap.o bind_addr.o socket.o primitive.o \
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output.o input.o debug.o ssnmap.o auth.o
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sctp_probe-y := probe.o
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sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
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sctp-$(CONFIG_PROC_FS) += proc.o
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sctp-$(CONFIG_SYSCTL) += sysctl.o
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@ -0,0 +1,213 @@
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/*
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* sctp_probe - Observe the SCTP flow with kprobes.
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*
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* The idea for this came from Werner Almesberger's umlsim
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* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
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*
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* Modified for SCTP from Stephen Hemminger's code
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* Copyright (C) 2010, Wei Yongjun <yjwei@cn.fujitsu.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/socket.h>
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#include <linux/sctp.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/kfifo.h>
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#include <linux/time.h>
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#include <net/net_namespace.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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MODULE_AUTHOR("Wei Yongjun <yjwei@cn.fujitsu.com>");
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MODULE_DESCRIPTION("SCTP snooper");
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MODULE_LICENSE("GPL");
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static int port __read_mostly = 0;
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MODULE_PARM_DESC(port, "Port to match (0=all)");
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module_param(port, int, 0);
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static int bufsize __read_mostly = 64 * 1024;
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MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
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module_param(bufsize, int, 0);
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static int full __read_mostly = 1;
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MODULE_PARM_DESC(full, "Full log (1=every ack packet received, 0=only cwnd changes)");
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module_param(full, int, 0);
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static const char procname[] = "sctpprobe";
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static struct {
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struct kfifo fifo;
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spinlock_t lock;
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wait_queue_head_t wait;
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struct timespec tstart;
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} sctpw;
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static void printl(const char *fmt, ...)
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{
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va_list args;
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int len;
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char tbuf[256];
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va_start(args, fmt);
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len = vscnprintf(tbuf, sizeof(tbuf), fmt, args);
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va_end(args);
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kfifo_in_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
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wake_up(&sctpw.wait);
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}
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static int sctpprobe_open(struct inode *inode, struct file *file)
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{
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kfifo_reset(&sctpw.fifo);
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getnstimeofday(&sctpw.tstart);
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return 0;
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}
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static ssize_t sctpprobe_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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int error = 0, cnt = 0;
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unsigned char *tbuf;
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if (!buf)
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return -EINVAL;
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if (len == 0)
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return 0;
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tbuf = vmalloc(len);
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if (!tbuf)
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return -ENOMEM;
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error = wait_event_interruptible(sctpw.wait,
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kfifo_len(&sctpw.fifo) != 0);
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if (error)
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goto out_free;
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cnt = kfifo_out_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
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error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
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out_free:
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vfree(tbuf);
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return error ? error : cnt;
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}
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static const struct file_operations sctpprobe_fops = {
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.owner = THIS_MODULE,
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.open = sctpprobe_open,
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.read = sctpprobe_read,
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};
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sctp_disposition_t jsctp_sf_eat_sack(const struct sctp_endpoint *ep,
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const struct sctp_association *asoc,
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const sctp_subtype_t type,
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void *arg,
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sctp_cmd_seq_t *commands)
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{
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struct sctp_transport *sp;
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static __u32 lcwnd = 0;
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struct timespec now;
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sp = asoc->peer.primary_path;
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if ((full || sp->cwnd != lcwnd) &&
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(!port || asoc->peer.port == port ||
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ep->base.bind_addr.port == port)) {
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lcwnd = sp->cwnd;
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getnstimeofday(&now);
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now = timespec_sub(now, sctpw.tstart);
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printl("%lu.%06lu ", (unsigned long) now.tv_sec,
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(unsigned long) now.tv_nsec / NSEC_PER_USEC);
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printl("%p %5d %5d %5d %8d %5d ", asoc,
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ep->base.bind_addr.port, asoc->peer.port,
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asoc->pathmtu, asoc->peer.rwnd, asoc->unack_data);
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list_for_each_entry(sp, &asoc->peer.transport_addr_list,
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transports) {
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if (sp == asoc->peer.primary_path)
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printl("*");
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if (sp->ipaddr.sa.sa_family == AF_INET)
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printl("%pI4 ", &sp->ipaddr.v4.sin_addr);
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else
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printl("%pI6 ", &sp->ipaddr.v6.sin6_addr);
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printl("%2u %8u %8u %8u %8u %8u ",
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sp->state, sp->cwnd, sp->ssthresh,
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sp->flight_size, sp->partial_bytes_acked,
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sp->pathmtu);
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}
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printl("\n");
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}
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jprobe_return();
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return 0;
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}
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static struct jprobe sctp_recv_probe = {
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.kp = {
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.symbol_name = "sctp_sf_eat_sack_6_2",
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},
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.entry = jsctp_sf_eat_sack,
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};
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static __init int sctpprobe_init(void)
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{
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int ret = -ENOMEM;
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init_waitqueue_head(&sctpw.wait);
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spin_lock_init(&sctpw.lock);
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if (kfifo_alloc(&sctpw.fifo, bufsize, GFP_KERNEL))
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return ret;
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if (!proc_net_fops_create(&init_net, procname, S_IRUSR,
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&sctpprobe_fops))
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goto free_kfifo;
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ret = register_jprobe(&sctp_recv_probe);
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if (ret)
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goto remove_proc;
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pr_info("SCTP probe registered (port=%d)\n", port);
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return 0;
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remove_proc:
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proc_net_remove(&init_net, procname);
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free_kfifo:
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kfifo_free(&sctpw.fifo);
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return ret;
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}
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static __exit void sctpprobe_exit(void)
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{
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kfifo_free(&sctpw.fifo);
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proc_net_remove(&init_net, procname);
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unregister_jprobe(&sctp_recv_probe);
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}
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module_init(sctpprobe_init);
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module_exit(sctpprobe_exit);
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