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bonding: make bond_arp_send_all use upper device list 

Currently, bond_arp_send_all() is aware only of vlans, which breaks
configurations like bond <- bridge (or any other 'upper' device) with IP
(which is quite a common scenario for virt setups).

To fix this we convert the bond_arp_send_all() to first verify if the rt
device is the bond itself, and if not - to go through its list of upper
vlans and their respectiv upper devices (if the vlan's upper device matches
- tag the packet), if still not found - go through all of our upper list
devices to see if any of them match the route device for the target. If the
match is a vlan device - we also save its vlan_id and tag it in
bond_arp_send().

Also, clean the function a bit to be more readable.

CC: Vlad Yasevich <vyasevic@redhat.com>
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Veaceslav Falico 2013-08-28 23:25:10 +02:00 committed by David S. Miller
parent c752af2c55
commit 27bc11e638
1 changed files with 52 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
drivers/net/bonding/bond_main.c
View File

@ -2444,30 +2444,16 @@ static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
int i, vlan_id;
__be32 *targets = bond->params.arp_targets;
struct vlan_entry *vlan;
struct net_device *vlan_dev = NULL;
struct net_device *upper, *vlan_upper;
struct list_head *iter, *vlan_iter;
struct rtable *rt;
__be32 *targets = bond->params.arp_targets, addr;
int i, vlan_id;
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
__be32 addr;
if (!targets[i])
break;
for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
pr_debug("basa: target %pI4\n", &targets[i]);
if (!bond_vlan_used(bond)) {
pr_debug("basa: empty vlan: arp_send\n");
addr = bond_confirm_addr(bond->dev, targets[i], 0);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
addr, 0);
continue;
}
/*
* If VLANs are configured, we do a route lookup to
* determine which VLAN interface would be used, so we
* can tag the ARP with the proper VLAN tag.
*/
/* Find out through which dev should the packet go */
rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
RTO_ONLINK, 0);
if (IS_ERR(rt)) {
@ -2478,47 +2464,61 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
continue;
}
/*
* This target is not on a VLAN
*/
if (rt->dst.dev == bond->dev) {
ip_rt_put(rt);
pr_debug("basa: rtdev == bond->dev: arp_send\n");
addr = bond_confirm_addr(bond->dev, targets[i], 0);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
addr, 0);
continue;
}
vlan_id = 0;
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
rcu_read_lock();
vlan_dev = __vlan_find_dev_deep(bond->dev,
htons(ETH_P_8021Q),
vlan->vlan_id);
rcu_read_unlock();
if (vlan_dev == rt->dst.dev) {
vlan_id = vlan->vlan_id;
pr_debug("basa: vlan match on %s %d\n",
vlan_dev->name, vlan_id);
break;
/* bond device itself */
if (rt->dst.dev == bond->dev)
goto found;
rcu_read_lock();
/* first we search only for vlan devices. for every vlan
* found we verify its upper dev list, searching for the
* rt->dst.dev. If found we save the tag of the vlan and
* proceed to send the packet.
*
* TODO: QinQ?
*/
netdev_for_each_upper_dev_rcu(bond->dev, vlan_upper, vlan_iter) {
if (!is_vlan_dev(vlan_upper))
continue;
netdev_for_each_upper_dev_rcu(vlan_upper, upper, iter) {
if (upper == rt->dst.dev) {
vlan_id = vlan_dev_vlan_id(vlan_upper);
rcu_read_unlock();
goto found;
}
}
}
if (vlan_id && vlan_dev) {
ip_rt_put(rt);
addr = bond_confirm_addr(vlan_dev, targets[i], 0);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
addr, vlan_id);
continue;
}
/* if the device we're looking for is not on top of any of
* our upper vlans, then just search for any dev that
* matches, and in case it's a vlan - save the id
*/
netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) {
if (upper == rt->dst.dev) {
/* if it's a vlan - get its VID */
if (is_vlan_dev(upper))
vlan_id = vlan_dev_vlan_id(upper);
if (net_ratelimit()) {
rcu_read_unlock();
goto found;
}
}
rcu_read_unlock();
/* Not our device - skip */
if (net_ratelimit())
pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
bond->dev->name, &targets[i],
rt->dst.dev ? rt->dst.dev->name : "NULL");
}
ip_rt_put(rt);
continue;
found:
addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
ip_rt_put(rt);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
addr, vlan_id);
}
}