From 87a7b84b588c2ddbde890890855aef18ec34174e Mon Sep 17 00:00:00 2001 From: Veaceslav Falico Date: Mon, 24 Jun 2013 11:49:29 +0200 Subject: bonding: add helper function bond_get_targets_ip(targets, ip) Add function bond_get_targets_ip(targets, ip) which searches through targets array of ips (arp_targets) and returns the position of first match. If ip == 0, returns the first free slot. On failure to find the ip or free slot, return -1. Use it to verify if the arp we've received is valid and in sysfs. v1->v2: Fix "[2/6] bonding: add helper function bond_get_targets_ip(targets, ip)", per Nikolay's advice, to verify if source ip != 0.0.0.0, otherwise we might update 'null' arp_ip_targets' last_rx. Also, address style. Signed-off-by: Veaceslav Falico Signed-off-by: David S. Miller --- drivers/net/bonding/bond_sysfs.c | 54 ++++++++++++++++------------------------ 1 file changed, 21 insertions(+), 33 deletions(-) (limited to 'drivers/net/bonding/bond_sysfs.c') diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index f8bee4c0cbf1..ece57f146a60 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -591,7 +591,7 @@ static ssize_t bonding_store_arp_targets(struct device *d, const char *buf, size_t count) { __be32 newtarget; - int i = 0, done = 0, ret = count; + int i = 0, ret = -EINVAL; struct bonding *bond = to_bond(d); __be32 *targets; @@ -602,57 +602,44 @@ static ssize_t bonding_store_arp_targets(struct device *d, if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) { pr_err("%s: invalid ARP target %pI4 specified for addition\n", bond->dev->name, &newtarget); - ret = -EINVAL; goto out; } - /* look for an empty slot to put the target in, and check for dupes */ - for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) { - if (targets[i] == newtarget) { /* duplicate */ - pr_err("%s: ARP target %pI4 is already present\n", - bond->dev->name, &newtarget); - ret = -EINVAL; - goto out; - } - if (targets[i] == 0) { - pr_info("%s: adding ARP target %pI4.\n", - bond->dev->name, &newtarget); - done = 1; - targets[i] = newtarget; - } + + if (bond_get_targets_ip(targets, newtarget) != -1) { /* dup */ + pr_err("%s: ARP target %pI4 is already present\n", + bond->dev->name, &newtarget); + goto out; } - if (!done) { + + i = bond_get_targets_ip(targets, 0); /* first free slot */ + if (i == -1) { pr_err("%s: ARP target table is full!\n", bond->dev->name); - ret = -EINVAL; goto out; } + pr_info("%s: adding ARP target %pI4.\n", bond->dev->name, + &newtarget); + targets[i] = newtarget; } 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); - ret = -EINVAL; goto out; } - for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) { - if (targets[i] == newtarget) { - int j; - pr_info("%s: removing ARP target %pI4.\n", - bond->dev->name, &newtarget); - for (j = i; (j < (BOND_MAX_ARP_TARGETS-1)) && targets[j+1]; j++) - targets[j] = targets[j+1]; - - targets[j] = 0; - done = 1; - } - } - if (!done) { + i = bond_get_targets_ip(targets, newtarget); + if (i == -1) { pr_info("%s: unable to remove nonexistent ARP target %pI4.\n", bond->dev->name, &newtarget); - ret = -EINVAL; goto out; } + + pr_info("%s: removing ARP target %pI4.\n", bond->dev->name, + &newtarget); + for (; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++) + targets[i] = targets[i+1]; + targets[i] = 0; } else { pr_err("no command found in arp_ip_targets file for bond %s. Use + or -.\n", bond->dev->name); @@ -660,6 +647,7 @@ static ssize_t bonding_store_arp_targets(struct device *d, goto out; } + ret = count; out: return ret; } -- cgit v1.2.3-59-g8ed1b