From 7e1a1ac1fbaa88fe254400b7f30b775502932ad3 Mon Sep 17 00:00:00 2001 From: Wang Chen Date: Mon, 14 Jul 2008 20:51:36 -0700 Subject: [PATCH] bonding: Check return of dev_set_promiscuity/allmulti dev_set_promiscuity/allmulti might overflow. Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes dev_set_promiscuity/allmulti return error number if overflow happened. In bond_alb and bond_main, we check all positive increment for promiscuity and allmulti to get error return. But there are still two problems left. 1. Some code path has no mechanism to signal errors upstream. 2. If there are multi slaves, it's hard to tell which slaves increment promisc/allmulti successfully and which failed. So I left these problems to be FIXME. Fortunately, the overflow is very rare case. Signed-off-by: Wang Chen Signed-off-by: David S. Miller --- drivers/net/bonding/bond_alb.c | 6 +++-- drivers/net/bonding/bond_main.c | 39 ++++++++++++++++++++++++++------- 2 files changed, 35 insertions(+), 10 deletions(-) diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 5a673725471c..b211486a0ca3 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -419,8 +419,10 @@ static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) } if (!bond->alb_info.primary_is_promisc) { - bond->alb_info.primary_is_promisc = 1; - dev_set_promiscuity(bond->curr_active_slave->dev, 1); + if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) + bond->alb_info.primary_is_promisc = 1; + else + bond->alb_info.primary_is_promisc = 0; } bond->alb_info.rlb_promisc_timeout_counter = 0; diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index dc733d75a5e9..8ae7ff313218 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -772,39 +772,49 @@ static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct /* * Push the promiscuity flag down to appropriate slaves */ -static void bond_set_promiscuity(struct bonding *bond, int inc) +static int bond_set_promiscuity(struct bonding *bond, int inc) { + int err = 0; if (USES_PRIMARY(bond->params.mode)) { /* write lock already acquired */ if (bond->curr_active_slave) { - dev_set_promiscuity(bond->curr_active_slave->dev, inc); + err = dev_set_promiscuity(bond->curr_active_slave->dev, + inc); } } else { struct slave *slave; int i; bond_for_each_slave(bond, slave, i) { - dev_set_promiscuity(slave->dev, inc); + err = dev_set_promiscuity(slave->dev, inc); + if (err) + return err; } } + return err; } /* * Push the allmulti flag down to all slaves */ -static void bond_set_allmulti(struct bonding *bond, int inc) +static int bond_set_allmulti(struct bonding *bond, int inc) { + int err = 0; if (USES_PRIMARY(bond->params.mode)) { /* write lock already acquired */ if (bond->curr_active_slave) { - dev_set_allmulti(bond->curr_active_slave->dev, inc); + err = dev_set_allmulti(bond->curr_active_slave->dev, + inc); } } else { struct slave *slave; int i; bond_for_each_slave(bond, slave, i) { - dev_set_allmulti(slave->dev, inc); + err = dev_set_allmulti(slave->dev, inc); + if (err) + return err; } } + return err; } /* @@ -965,6 +975,7 @@ static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct } if (new_active) { + /* FIXME: Signal errors upstream. */ if (bond->dev->flags & IFF_PROMISC) { dev_set_promiscuity(new_active->dev, 1); } @@ -1544,12 +1555,16 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) if (!USES_PRIMARY(bond->params.mode)) { /* set promiscuity level to new slave */ if (bond_dev->flags & IFF_PROMISC) { - dev_set_promiscuity(slave_dev, 1); + res = dev_set_promiscuity(slave_dev, 1); + if (res) + goto err_close; } /* set allmulti level to new slave */ if (bond_dev->flags & IFF_ALLMULTI) { - dev_set_allmulti(slave_dev, 1); + res = dev_set_allmulti(slave_dev, 1); + if (res) + goto err_close; } netif_tx_lock_bh(bond_dev); @@ -4065,6 +4080,10 @@ static void bond_set_multicast_list(struct net_device *bond_dev) * Do promisc before checking multicast_mode */ if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) { + /* + * FIXME: Need to handle the error when one of the multi-slaves + * encounters error. + */ bond_set_promiscuity(bond, 1); } @@ -4074,6 +4093,10 @@ static void bond_set_multicast_list(struct net_device *bond_dev) /* set allmulti flag to slaves */ if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) { + /* + * FIXME: Need to handle the error when one of the multi-slaves + * encounters error. + */ bond_set_allmulti(bond, 1); } -- 2.30.2