From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/net/l2tp/l2tp_debugfs.c | 65 ++++++++++++--------------------
1 files changed, 24 insertions(+), 41 deletions(-)
diff --git a/kernel/net/l2tp/l2tp_debugfs.c b/kernel/net/l2tp/l2tp_debugfs.c
index 9821a14..bca75be 100644
--- a/kernel/net/l2tp/l2tp_debugfs.c
+++ b/kernel/net/l2tp/l2tp_debugfs.c
@@ -1,12 +1,7 @@
-/*
- * L2TP subsystem debugfs
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* L2TP subsystem debugfs
*
* Copyright (c) 2010 Katalix Systems Ltd
- *
- * 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -35,7 +30,6 @@
#include "l2tp_core.h"
static struct dentry *rootdir;
-static struct dentry *tunnels;
struct l2tp_dfs_seq_data {
struct net *net;
@@ -64,11 +58,10 @@
pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
pd->session_idx++;
- if (pd->session == NULL) {
+ if (!pd->session) {
pd->session_idx = 0;
l2tp_dfs_next_tunnel(pd);
}
-
}
static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
@@ -79,22 +72,24 @@
if (!pos)
goto out;
- BUG_ON(m->private == NULL);
+ if (WARN_ON(!m->private)) {
+ pd = NULL;
+ goto out;
+ }
pd = m->private;
- if (pd->tunnel == NULL)
+ if (!pd->tunnel)
l2tp_dfs_next_tunnel(pd);
else
l2tp_dfs_next_session(pd);
/* NULL tunnel and session indicates end of list */
- if ((pd->tunnel == NULL) && (pd->session == NULL))
+ if (!pd->tunnel && !pd->session)
pd = NULL;
out:
return pd;
}
-
static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
@@ -153,11 +148,13 @@
const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
seq_printf(m, " from %pI6c to %pI6c\n",
- &np->saddr, &tunnel->sock->sk_v6_daddr);
- } else
+ &np->saddr, &tunnel->sock->sk_v6_daddr);
+ }
#endif
- seq_printf(m, " from %pI4 to %pI4\n",
- &inet->inet_saddr, &inet->inet_daddr);
+ if (tunnel->sock->sk_family == AF_INET)
+ seq_printf(m, " from %pI4 to %pI4\n",
+ &inet->inet_saddr, &inet->inet_daddr);
+
if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
seq_printf(m, " source port %hu, dest port %hu\n",
ntohs(inet->inet_sport), ntohs(inet->inet_dport));
@@ -170,7 +167,7 @@
tunnel->sock ? refcount_read(&tunnel->sock->sk_refcnt) : 0,
refcount_read(&tunnel->ref_count));
seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n",
- tunnel->debug,
+ 0,
atomic_long_read(&tunnel->stats.tx_packets),
atomic_long_read(&tunnel->stats.tx_bytes),
atomic_long_read(&tunnel->stats.tx_errors),
@@ -195,7 +192,7 @@
session->recv_seq ? 'R' : '-',
session->send_seq ? 'S' : '-',
session->lns_mode ? "LNS" : "LAC",
- session->debug,
+ 0,
jiffies_to_msecs(session->reorder_timeout));
seq_printf(m, " offset 0 l2specific %hu/%hu\n",
session->l2specific_type, l2tp_get_l2specific_len(session));
@@ -207,7 +204,7 @@
seq_printf(m, "%02x%02x%02x%02x",
session->cookie[4], session->cookie[5],
session->cookie[6], session->cookie[7]);
- seq_printf(m, "\n");
+ seq_puts(m, "\n");
}
if (session->peer_cookie_len) {
seq_printf(m, " peer cookie %02x%02x%02x%02x",
@@ -217,7 +214,7 @@
seq_printf(m, "%02x%02x%02x%02x",
session->peer_cookie[4], session->peer_cookie[5],
session->peer_cookie[6], session->peer_cookie[7]);
- seq_printf(m, "\n");
+ seq_puts(m, "\n");
}
seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",
@@ -229,7 +226,7 @@
atomic_long_read(&session->stats.rx_bytes),
atomic_long_read(&session->stats.rx_errors));
- if (session->show != NULL)
+ if (session->show)
session->show(m, session);
}
@@ -276,7 +273,7 @@
int rc = -ENOMEM;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
- if (pd == NULL)
+ if (!pd)
goto out;
/* Derive the network namespace from the pid opening the
@@ -330,32 +327,18 @@
static int __init l2tp_debugfs_init(void)
{
- int rc = 0;
-
rootdir = debugfs_create_dir("l2tp", NULL);
- if (IS_ERR(rootdir)) {
- rc = PTR_ERR(rootdir);
- rootdir = NULL;
- goto out;
- }
- tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
- if (tunnels == NULL)
- rc = -EIO;
+ debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
pr_info("L2TP debugfs support\n");
-out:
- if (rc)
- pr_warn("unable to init\n");
-
- return rc;
+ return 0;
}
static void __exit l2tp_debugfs_exit(void)
{
- debugfs_remove(tunnels);
- debugfs_remove(rootdir);
+ debugfs_remove_recursive(rootdir);
}
module_init(l2tp_debugfs_init);
--
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