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net/procfs: add tcp profs support

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add proc node /proc/net/tcp to show the active tcp connections from procfs

nuttx style:

server> cat /proc/net/tcp
TCP sl  st flg ref tmr uack nrt   rxsz local_address           remote_address
     1: 04  61   1  12    0   0   1024          0.0.0.0:4855      192.168.31.22:5001
     2: 04  61   1  12    0   0   1024          0.0.0.0:4856      192.168.31.22:5001
     3: 04  61   1   9    0   0      0                      :::4853   fe80::b27b:25ff:fe28:4011:8789
     4: 04  61   1   3    3   0      0                      :::4854   fe80::b27b:25ff:fe28:4011:8789

linux kernel:
https://www.kernel.org/doc/Documentation/networking/proc_net_tcp.txt

Signed-off-by: chao an <anchao@xiaomi.com>
This commit is contained in:
chao an 2022-09-05 17:06:05 +08:00 committed by Xiang Xiao
parent c754df6411
commit 7190e56a14
4 changed files with 252 additions and 0 deletions
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3
net/procfs/Make.defs
View File

@ -33,6 +33,9 @@ ifeq ($(CONFIG_NET_STATISTICS),y)
ifeq ($(CONFIG_NET_MLD),y)
NET_CSRCS += net_mld.c
endif
ifeq ($(CONFIG_NET_TCP),y)
NET_CSRCS += net_tcp.c
endif
endif
# Routing table

8
net/procfs/net_procfs.c
View File

@ -124,6 +124,14 @@ static const struct netprocfs_entry_s g_net_entries[] =
}
},
# endif
# ifdef CONFIG_NET_TCP
{
DTYPE_FILE, "tcp",
{
netprocfs_read_tcpstats
}
},
# endif
#endif
#ifdef CONFIG_NET_ROUTE
{

218
net/procfs/net_tcp.c Normal file
View File

@ -0,0 +1,218 @@
/****************************************************************************
* net/procfs/net_tcp.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <debug.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <nuttx/net/netstats.h>
#include "procfs/procfs.h"
#include "tcp/tcp.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_NET_TCP
#ifdef CONFIG_NET_IPv6
# define TCP_LINELEN 180
#else
# define TCP_LINELEN 120
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
static ssize_t netprocfs_tcpstats(FAR struct netprocfs_file_s *priv,
FAR char *buffer, size_t buflen,
uint8_t domain, int *skip)
{
int addrlen = (domain == PF_INET) ?
INET_ADDRSTRLEN : INET6_ADDRSTRLEN;
FAR struct tcp_conn_s *conn = NULL;
char remote[addrlen + 1];
char local[addrlen + 1];
int len = 0;
void *laddr;
void *raddr;
net_lock();
local[addrlen] = '\0';
remote[addrlen] = '\0';
while ((conn = tcp_nextconn(conn)) != NULL)
{
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
if (conn->domain != domain)
{
continue;
}
#endif /* CONFIG_NET_IPv4 && CONFIG_NET_IPv6 */
if (++(*skip) <= priv->offset)
{
continue;
}
if (buflen - len < TCP_LINELEN)
{
break;
}
#ifdef CONFIG_NET_IPv4
# ifdef CONFIG_NET_IPv6
if (domain == PF_INET)
# endif /* CONFIG_NET_IPv6 */
{
laddr = &conn->u.ipv4.laddr;
raddr = &conn->u.ipv4.raddr;
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
# ifdef CONFIG_NET_IPv4
else
# endif /* CONFIG_NET_IPv4 */
{
laddr = &conn->u.ipv6.laddr;
raddr = &conn->u.ipv6.raddr;
}
#endif /* CONFIG_NET_IPv6 */
len += snprintf(buffer + len, buflen - len,
" %2" PRIu8
": %02" PRIx8
" %3" PRIx8 " %3" PRIu8
" %3" PRIu8
" %4" PRIu32
" %3" PRIu8
#if CONFIG_NET_SEND_BUFSIZE > 0
" %6" PRIu32
#endif
" %6u",
priv->offset++,
conn->tcpstateflags,
conn->sconn.s_flags,
conn->crefs,
conn->timer,
(uint32_t)conn->tx_unacked,
conn->nrtx,
#if CONFIG_NET_SEND_BUFSIZE > 0
tcp_wrbuffer_inqueue_size(conn),
#endif
(conn->readahead) ? conn->readahead->io_pktlen : 0);
len += snprintf(buffer + len, buflen - len,
" %*s:%-6" PRIu16 " %*s:%-6" PRIu16 "\n",
(domain == PF_INET6) ? addrlen / 2 : addrlen,
inet_ntop(domain, laddr, local, addrlen),
ntohs(conn->lport),
(domain == PF_INET6) ? addrlen / 2 : addrlen,
inet_ntop(domain, raddr, remote, addrlen),
ntohs(conn->rport));
}
net_unlock();
return len;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netprocfs_read_tcpstats
*
* Description:
* Read and format TCP statistics.
*
* Input Parameters:
* priv - A reference to the network procfs file structure
* buffer - The user-provided buffer into which network status will be
* returned.
* bulen - The size in bytes of the user provided buffer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
ssize_t netprocfs_read_tcpstats(FAR struct netprocfs_file_s *priv,
FAR char *buffer, size_t buflen)
{
int skip = 1;
int len = 0;
net_lock();
if (tcp_nextconn(NULL) != NULL)
{
if (priv->offset == 0)
{
len = snprintf(buffer, buflen, "TCP sl "
"st flg ref tmr uack nrt "
#if CONFIG_NET_SEND_BUFSIZE > 0
"txsz "
#endif
"rxsz "
"%-*s "
"%-*s\n"
,
INET6_ADDRSTRLEN / 2,
"local_address",
INET6_ADDRSTRLEN / 2,
"remote_address"
);
priv->offset = 1;
}
#ifdef CONFIG_NET_IPv4
len += netprocfs_tcpstats(priv, buffer + len,
buflen - len, PF_INET, &skip);
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
len += netprocfs_tcpstats(priv, buffer + len,
buflen - len, PF_INET6, &skip);
#endif /* CONFIG_NET_IPv6 */
}
net_unlock();
return len;
}
#endif /* CONFIG_NET_TCP */

23
net/procfs/procfs.h
View File

@ -164,6 +164,29 @@ ssize_t netprocfs_read_mldstats(FAR struct netprocfs_file_s *priv,
FAR char *buffer, size_t buflen);
#endif
/****************************************************************************
* Name: netprocfs_read_tcpstats
*
* Description:
* Read and format TCP statistics.
*
* Input Parameters:
* priv - A reference to the network procfs file structure
* buffer - The user-provided buffer into which network status will be
* returned.
* bulen - The size in bytes of the user provided buffer.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
ssize_t netprocfs_read_tcpstats(FAR struct netprocfs_file_s *priv,
FAR char *buffer, size_t buflen);
#endif
/****************************************************************************
* Name: netprocfs_read_routes
*