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Date: Fri, 30 Apr 2010 17:45:29 +0200
From: Jiri Bohac <jbohac@...e.cz>
To: Jay Vosburgh <fubar@...ibm.com>
Cc: Jiri Bohac <jbohac@...e.cz>, bonding-devel@...ts.sourceforge.net,
netdev@...r.kernel.org
Subject: Re: [PATCH] bonding: fix arp_validate on bonds inside a bridge
On Thu, Apr 29, 2010 at 11:57:23AM -0700, Jay Vosburgh wrote:
> This doesn't apply to the current net-next-2.6 (because
> skb_bond_should_drop was pulled out of line a few weeks ago); can you
> update the patch?
sure, here it goes:
----
bonding with arp_validate does not currently work when the
bonding master is part of a bridge. This is because
bond_arp_rcv() is registered as a packet type handler for ARP,
but before netif_receive_skb() processes the ptype_base hash
table, handle_bridge() is called and changes the skb->dev to
point to the bridge device.
This patch makes bonding_should_drop() call the bonding ARP
handler directly if a IFF_MASTER_NEEDARP flag is set on the
bonding master. bond_register_arp() now only needs to set the
IFF_MASTER_NEEDARP flag.
We no longer need special ARP handling for inactive slaves, hence
IFF_SLAVE_NEEDARP is not needed.
skb_reset_network_header() and skb_reset_transport_header() need
to be called before the call to bonding_should_drop() because
bond_handle_arp() needs the offsets initialized.
As a side-effect, skb_bond_should_drop is #defined as 0
when CONFIG_BONDING is not set.
Signed-off-by: Jiri Bohac <jbohac@...e.cz>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 85e813c..b149bfa 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1879,8 +1879,7 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
}
slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
- IFF_SLAVE_INACTIVE | IFF_BONDING |
- IFF_SLAVE_NEEDARP);
+ IFF_SLAVE_INACTIVE | IFF_BONDING);
kfree(slave);
@@ -2551,11 +2550,12 @@ static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32
}
}
-static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
+static void bond_handle_arp(struct sk_buff *skb)
{
struct arphdr *arp;
struct slave *slave;
struct bonding *bond;
+ struct net_device *dev = skb->dev->master, *orig_dev = skb->dev;
unsigned char *arp_ptr;
__be32 sip, tip;
@@ -2576,9 +2576,8 @@ static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct pack
bond = netdev_priv(dev);
read_lock(&bond->lock);
- pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
- bond->dev->name, skb->dev ? skb->dev->name : "NULL",
- orig_dev ? orig_dev->name : "NULL");
+ pr_debug("bond_handle_arp: bond: %s, master: %s, slave: %s\n",
+ bond->dev->name, dev->name, orig_dev->name);
slave = bond_get_slave_by_dev(bond, orig_dev);
if (!slave || !slave_do_arp_validate(bond, slave))
@@ -2623,8 +2622,7 @@ static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct pack
out_unlock:
read_unlock(&bond->lock);
out:
- dev_kfree_skb(skb);
- return NET_RX_SUCCESS;
+ return;
}
/*
@@ -3506,23 +3504,12 @@ static void bond_unregister_lacpdu(struct bonding *bond)
void bond_register_arp(struct bonding *bond)
{
- struct packet_type *pt = &bond->arp_mon_pt;
-
- if (pt->type)
- return;
-
- pt->type = htons(ETH_P_ARP);
- pt->dev = bond->dev;
- pt->func = bond_arp_rcv;
- dev_add_pack(pt);
+ bond->dev->priv_flags |= IFF_MASTER_NEEDARP;
}
void bond_unregister_arp(struct bonding *bond)
{
- struct packet_type *pt = &bond->arp_mon_pt;
-
- dev_remove_pack(pt);
- pt->type = 0;
+ bond->dev->priv_flags &= ~IFF_MASTER_NEEDARP;
}
/*---------------------------- Hashing Policies -----------------------------*/
@@ -4967,6 +4954,7 @@ static struct pernet_operations bond_net_ops = {
.size = sizeof(struct bond_net),
};
+extern void (*bond_handle_arp_hook)(struct sk_buff *skb);
static int __init bonding_init(void)
{
int i;
@@ -4999,6 +4987,7 @@ static int __init bonding_init(void)
register_netdevice_notifier(&bond_netdev_notifier);
register_inetaddr_notifier(&bond_inetaddr_notifier);
bond_register_ipv6_notifier();
+ bond_handle_arp_hook = bond_handle_arp;
out:
return res;
err:
@@ -5019,6 +5008,7 @@ static void __exit bonding_exit(void)
rtnl_link_unregister(&bond_link_ops);
unregister_pernet_subsys(&bond_net_ops);
+ bond_handle_arp_hook = NULL;
}
module_init(bonding_init);
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 2aa3367..64e0108 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -212,7 +212,6 @@ struct bonding {
struct bond_params params;
struct list_head vlan_list;
struct vlan_group *vlgrp;
- struct packet_type arp_mon_pt;
struct workqueue_struct *wq;
struct delayed_work mii_work;
struct delayed_work arp_work;
@@ -292,14 +291,12 @@ static inline void bond_set_slave_inactive_flags(struct slave *slave)
if (!bond_is_lb(bond))
slave->state = BOND_STATE_BACKUP;
slave->dev->priv_flags |= IFF_SLAVE_INACTIVE;
- if (slave_do_arp_validate(bond, slave))
- slave->dev->priv_flags |= IFF_SLAVE_NEEDARP;
}
static inline void bond_set_slave_active_flags(struct slave *slave)
{
slave->state = BOND_STATE_ACTIVE;
- slave->dev->priv_flags &= ~(IFF_SLAVE_INACTIVE | IFF_SLAVE_NEEDARP);
+ slave->dev->priv_flags &= ~IFF_SLAVE_INACTIVE;
}
static inline void bond_set_master_3ad_flags(struct bonding *bond)
diff --git a/include/linux/if.h b/include/linux/if.h
index 3a9f410..84ab2c8 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -63,7 +63,7 @@
#define IFF_MASTER_8023AD 0x8 /* bonding master, 802.3ad. */
#define IFF_MASTER_ALB 0x10 /* bonding master, balance-alb. */
#define IFF_BONDING 0x20 /* bonding master or slave */
-#define IFF_SLAVE_NEEDARP 0x40 /* need ARPs for validation */
+#define IFF_MASTER_NEEDARP 0x40 /* need ARPs for validation */
#define IFF_ISATAP 0x80 /* ISATAP interface (RFC4214) */
#define IFF_MASTER_ARPMON 0x100 /* bonding master, ARP mon in use */
#define IFF_WAN_HDLC 0x200 /* WAN HDLC device */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 40d4c20..fa27d16 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2162,6 +2162,7 @@ static inline void netif_set_gso_max_size(struct net_device *dev,
dev->gso_max_size = size;
}
+#if defined(CONFIG_BONDING) || defined(CONFIG_BONDING_MODULE)
extern int __skb_bond_should_drop(struct sk_buff *skb,
struct net_device *master);
@@ -2172,6 +2173,9 @@ static inline int skb_bond_should_drop(struct sk_buff *skb,
return __skb_bond_should_drop(skb, master);
return 0;
}
+#else
+#define skb_bond_should_drop(a, b) 0
+#endif
extern struct pernet_operations __net_initdata loopback_net_ops;
diff --git a/net/core/dev.c b/net/core/dev.c
index 100dcbd..2689ff0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2734,6 +2734,10 @@ static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
}
}
+#if defined(CONFIG_BONDING) || defined(CONFIG_BONDING_MODULE)
+void (*bond_handle_arp_hook)(struct sk_buff *skb);
+EXPORT_SYMBOL_GPL(bond_handle_arp_hook);
+
/* On bonding slaves other than the currently active slave, suppress
* duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
* ARP on active-backup slaves with arp_validate enabled.
@@ -2753,11 +2757,13 @@ int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
skb_bond_set_mac_by_master(skb, master);
}
- if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
- if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
- skb->protocol == __cpu_to_be16(ETH_P_ARP))
- return 0;
+ /* pass ARP frames directly to bonding
+ before bridging or other hooks change them */
+ if ((master->priv_flags & IFF_MASTER_NEEDARP) &&
+ skb->protocol == __cpu_to_be16(ETH_P_ARP))
+ bond_handle_arp_hook(skb);
+ if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
if (master->priv_flags & IFF_MASTER_ALB) {
if (skb->pkt_type != PACKET_BROADCAST &&
skb->pkt_type != PACKET_MULTICAST)
@@ -2772,6 +2778,7 @@ int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
return 0;
}
EXPORT_SYMBOL(__skb_bond_should_drop);
+#endif
static int __netif_receive_skb(struct sk_buff *skb)
{
@@ -2796,6 +2803,10 @@ static int __netif_receive_skb(struct sk_buff *skb)
if (!skb->skb_iif)
skb->skb_iif = skb->dev->ifindex;
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ skb->mac_len = skb->network_header - skb->mac_header;
+
null_or_orig = NULL;
orig_dev = skb->dev;
master = ACCESS_ONCE(orig_dev->master);
@@ -2808,10 +2819,6 @@ static int __netif_receive_skb(struct sk_buff *skb)
__get_cpu_var(netdev_rx_stat).total++;
- skb_reset_network_header(skb);
- skb_reset_transport_header(skb);
- skb->mac_len = skb->network_header - skb->mac_header;
-
pt_prev = NULL;
rcu_read_lock();
--
Jiri Bohac <jbohac@...e.cz>
SUSE Labs, SUSE CZ
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