From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ding Tianhong Subject: [PATCH net v4] bonding: add ip checks when store ip target Date: Fri, 15 Nov 2013 09:58:58 +0800 Message-ID: <52857FE2.5060400@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit To: Jay Vosburgh , Andy Gospodarek , "David S. Miller" , Nikolay Aleksandrov , Veaceslav Falico , Netdev Return-path: Received: from szxga01-in.huawei.com ([119.145.14.64]:46000 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756039Ab3KOCAe (ORCPT ); Thu, 14 Nov 2013 21:00:34 -0500 Sender: netdev-owner@vger.kernel.org List-ID: >>From 513509eecdee98d72668219aead9784d56dbad0f Mon Sep 17 00:00:00 2001 From: Wang Weidong Date: Fri, 15 Nov 2013 10:34:30 -0500 Subject: [PATCH] bonding: add ip checks when store ip target I met a Bug when I add ip target with the wrong ip address: echo +500.500.500.500 > /sys/class/net/bond0/bonding/arp_ip_target the wrong ip address will transfor to 245.245.245.244 and add to the ip target success, it is uncorrect, so I add checks to avoid adding wrong address. The in4_pton() will set wrong ip address to 0.0.0.0, it will return by the next check and will not add to ip target. v2 According Veaceslav's opinion, simplify the code. v3 According Veaceslav's opinion, add broadcast check and make a micro definition to package it. v4 Solve the problem of the format which David point out. Suggested-by: Veaceslav Falico Suggested-by: David S. Miller Signed-off-by: Ding Tianhong --- drivers/net/bonding/bond_sysfs.c | 19 ++++++------------- drivers/net/bonding/bonding.h | 3 +++ 2 files changed, 9 insertions(+), 13 deletions(-) diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index 47749c9..21dd2a5 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -611,15 +611,14 @@ static ssize_t bonding_store_arp_targets(struct device *d, return restart_syscall(); targets = bond->params.arp_targets; - newtarget = in_aton(buf + 1); + if (!in4_pton(buf + 1, -1, (u8 *)&newtarget, -1, NULL) || + IS_IP_TARGET_UNUSABLE_ADDRESS(newtarget)) { + pr_err("%s: invalid ARP target %pI4 specified for addition\n", + bond->dev->name, &newtarget); + goto out; + } /* look for adds */ if (buf[0] == '+') { - if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) { - pr_err("%s: invalid ARP target %pI4 specified for addition\n", - bond->dev->name, &newtarget); - goto out; - } - if (bond_get_targets_ip(targets, newtarget) != -1) { /* dup */ pr_err("%s: ARP target %pI4 is already present\n", bond->dev->name, &newtarget); @@ -642,12 +641,6 @@ static ssize_t bonding_store_arp_targets(struct device *d, targets[ind] = newtarget; write_unlock_bh(&bond->lock); } else if (buf[0] == '-') { - if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) { - pr_err("%s: invalid ARP target %pI4 specified for removal\n", - bond->dev->name, &newtarget); - goto out; - } - ind = bond_get_targets_ip(targets, newtarget); if (ind == -1) { pr_err("%s: unable to remove nonexistent ARP target %pI4.\n", diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index 046a605..253d5da 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -63,6 +63,9 @@ (((mode) == BOND_MODE_TLB) || \ ((mode) == BOND_MODE_ALB)) +#define IS_IP_TARGET_UNUSABLE_ADDRESS(a) \ + ((htonl(INADDR_BROADCAST) == a) || \ + ipv4_is_zeronet(a)) /* * Less bad way to call ioctl from within the kernel; this needs to be * done some other way to get the call out of interrupt context. -- 1.7.12