lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <45FFD433.8060706@bx.jp.nec.com>
Date:	Tue, 20 Mar 2007 21:31:47 +0900
From:	Keiichi KII <k-keiichi@...jp.nec.com>
To:	mpm@...enic.com
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC][PATCH -mm take3 5/6][resend] switch function of netpoll

From: Keiichi KII <k-keiichi@...jp.nec.com>

This patch contains switch function of netpoll.

If "enabled" attribute of certain port is '1', this port is used
and the configurations of this port are uable to change.

If "enabled" attribute of certain port is '0', this port isn't used
and the configurations of this port are able to change.

-+- /sys/class/misc/
|-+- netconsole/
  |-+- port1/
  | |--- id          [r--r--r--]  id
  | |--- enabled     [rw-r--r--]  0: disable 1: enable, writable
  | ...
  |--- port2/
  ...

Signed-off-by: Keiichi KII <k-keiichi@...jp.nec.com>
Signed-off-by: Takayoshi Kochi <t-kochi@...jp.nec.com>
---
Index: linux-2.6.19.5/drivers/net/netconsole.c
===================================================================
--- linux-2.6.19.5.orig/drivers/net/netconsole.c
+++ linux-2.6.19.5/drivers/net/netconsole.c
@@ -60,6 +60,7 @@ struct netconsole_target {
 	struct list_head list;
 	struct kobject obj;
 	int id;
+	int enabled;
 	struct netpoll np;
 };
 
@@ -128,10 +129,19 @@ static ssize_t show_remote_mac(struct ne
 		       nt->np.remote_mac[4], nt->np.remote_mac[5]);
 }
 
+static ssize_t show_enabled(struct netconsole_target *nt, char *buf)
+{
+	return sprintf(buf, "%d\n", nt->enabled);
+}
+
 static ssize_t store_local_port(struct netconsole_target *nt, const char *buf,
 				size_t count)
 {
 	spin_lock(&target_list_lock);
+	if (nt->enabled) {
+		spin_unlock(&target_list_lock);
+		return -EINVAL;
+	}
 	nt->np.local_port = simple_strtol(buf, NULL, 10);
 	spin_unlock(&target_list_lock);
 
@@ -142,6 +152,10 @@ static ssize_t store_remote_port(struct 
 				size_t count)
 {
 	spin_lock(&target_list_lock);
+	if (nt->enabled) {
+		spin_unlock(&target_list_lock);
+		return -EINVAL;
+	}
 	nt->np.remote_port = simple_strtol(buf, NULL, 10);
 	spin_unlock(&target_list_lock);
 
@@ -152,6 +166,10 @@ static ssize_t store_local_ip(struct net
 			      size_t count)
 {
 	spin_lock(&target_list_lock);
+	if (nt->enabled) {
+		spin_unlock(&target_list_lock);
+		return -EINVAL;
+	}
 	nt->np.local_ip = ntohl(in_aton(buf));
 	spin_unlock(&target_list_lock);
 
@@ -162,6 +180,10 @@ static ssize_t store_remote_ip(struct ne
 			       size_t count)
 {
 	spin_lock(&target_list_lock);
+	if (nt->enabled) {
+		spin_unlock(&target_list_lock);
+		return -EINVAL;
+	}
 	nt->np.remote_ip = ntohl(in_aton(buf));
 	spin_unlock(&target_list_lock);
 
@@ -184,12 +206,39 @@ static ssize_t store_remote_mac(struct n
 	if (i != ETH_ALEN)
 		return -EINVAL;
 	spin_lock(&target_list_lock);
+	if (nt->enabled) {
+		spin_unlock(&target_list_lock);
+		return -EINVAL;
+	}
 	memcpy(nt->np.remote_mac, input_mac, ETH_ALEN);
 	spin_unlock(&target_list_lock);
 
 	return count;
 }
 
+static ssize_t store_enabled(struct netconsole_target *nt, const char *buf,
+			    size_t count)
+{
+	int enabled = 0;
+
+	if (count >= 2 && (count != 2 || buf[count - 1] != '\n')) {
+		printk(KERN_ERR "netconsole: invalid argument: %s\n", buf);
+		return -EINVAL;
+	} else if (strncmp(buf, "1", 1) == 0) {
+		enabled = 1;
+	} else if(strncmp(buf, "0", 1) == 0) {
+		enabled = 0;
+	} else {
+		printk(KERN_ERR "netconsole: invalid argument: %s\n", buf);
+		return -EINVAL;
+	}
+	spin_lock(&target_list_lock);
+	nt->enabled = enabled;
+	spin_unlock(&target_list_lock);
+
+	return count;
+}
+
 #define NETCON_CLASS_ATTR(_name, _mode, _show, _store) \
 struct target_attr target_attr_##_name = \
                            __ATTR(_name, _mode, _show, _store)
@@ -206,6 +255,8 @@ static NETCON_CLASS_ATTR(remote_ip, S_IR
 static NETCON_CLASS_ATTR(local_mac, S_IRUGO, show_local_mac, NULL);
 static NETCON_CLASS_ATTR(remote_mac, S_IRUGO | S_IWUSR,
 			 show_remote_mac, store_remote_mac);
+static NETCON_CLASS_ATTR(enabled, S_IRUGO | S_IWUSR,
+			 show_enabled, store_enabled);
 
 static struct attribute *target_attrs[] = {
 	&target_attr_id.attr,
@@ -215,6 +266,7 @@ static struct attribute *target_attrs[] 
 	&target_attr_remote_ip.attr,
 	&target_attr_local_mac.attr,
 	&target_attr_remote_mac.attr,
+	&target_attr_enabled.attr,
 	NULL
 };
 
@@ -313,6 +365,7 @@ static int add_target(char* target_confi
 
 	atomic_inc(&target_count);
 	new_target->id = atomic_read(&target_count);
+	new_target->enabled = 1;
 
 	printk(KERN_INFO "netconsole: add target: "
 	       "remote ip_addr=%d.%d.%d.%d remote port=%d\n",
@@ -420,7 +473,8 @@ static void write_msg(struct console *co
 	for(left = len; left; ) {
 		frag = min(left, MAX_PRINT_CHUNK);
 		list_for_each_entry(target, &target_list, list) {
-			netpoll_send_udp(&target->np, msg, frag);
+			if (target->enabled)
+				netpoll_send_udp(&target->np, msg, frag);
 		}
 		msg += frag;
 		left -= frag;

-- 


-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ