[PATCH] bonding: Validate probe replies in ARP monitor
Add logic to check ARP request / reply packets used for ARP
monitor link integrity checking.
The current method simply examines the slave device to see if it
has sent and received traffic; this can be fooled by extraneous traffic.
For example, if multiple hosts running bonding are behind a common
switch, the probe traffic from the multiple instances of bonding will
update the tx/rx times on each other's slave devices.
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index bafe62f..fd521b0 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -96,6 +96,7 @@
static char *xmit_hash_policy = NULL;
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
+static char *arp_validate = NULL;
struct bond_params bonding_defaults;
module_param(max_bonds, int, 0);
@@ -127,6 +128,8 @@
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
+module_param(arp_validate, charp, 0);
+MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
/*----------------------------- Global variables ----------------------------*/
@@ -170,6 +173,14 @@
{ NULL, -1},
};
+struct bond_parm_tbl arp_validate_tbl[] = {
+{ "none", BOND_ARP_VALIDATE_NONE},
+{ "active", BOND_ARP_VALIDATE_ACTIVE},
+{ "backup", BOND_ARP_VALIDATE_BACKUP},
+{ "all", BOND_ARP_VALIDATE_ALL},
+{ NULL, -1},
+};
+
/*-------------------------- Forward declarations ---------------------------*/
static void bond_send_gratuitous_arp(struct bonding *bond);
@@ -1424,6 +1435,8 @@
bond_compute_features(bond);
+ new_slave->last_arp_rx = jiffies;
+
if (bond->params.miimon && !bond->params.use_carrier) {
link_reporting = bond_check_dev_link(bond, slave_dev, 1);
@@ -1785,7 +1798,8 @@
dev_set_mac_address(slave_dev, &addr);
slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
- IFF_SLAVE_INACTIVE | IFF_BONDING);
+ IFF_SLAVE_INACTIVE | IFF_BONDING |
+ IFF_SLAVE_NEEDARP);
kfree(slave);
@@ -2298,6 +2312,25 @@
return 0;
}
+static int bond_has_this_ip(struct bonding *bond, u32 ip)
+{
+ struct vlan_entry *vlan, *vlan_next;
+
+ if (ip == bond->master_ip)
+ return 1;
+
+ if (list_empty(&bond->vlan_list))
+ return 0;
+
+ list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
+ vlan_list) {
+ if (ip == vlan->vlan_ip)
+ return 1;
+ }
+
+ return 0;
+}
+
/*
* We go to the (large) trouble of VLAN tagging ARP frames because
* switches in VLAN mode (especially if ports are configured as
@@ -2436,6 +2469,93 @@
}
}
+static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
+{
+ int i;
+ u32 *targets = bond->params.arp_targets;
+
+ targets = bond->params.arp_targets;
+ for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
+ dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
+ "%u.%u.%u.%u bhti(tip) %d\n",
+ NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
+ bond_has_this_ip(bond, tip));
+ if (sip == targets[i]) {
+ if (bond_has_this_ip(bond, tip))
+ slave->last_arp_rx = jiffies;
+ return;
+ }
+ }
+}
+
+static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct arphdr *arp;
+ struct slave *slave;
+ struct bonding *bond;
+ unsigned char *arp_ptr;
+ u32 sip, tip;
+
+ if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
+ goto out;
+
+ bond = dev->priv;
+ read_lock(&bond->lock);
+
+ dprintk("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");
+
+ slave = bond_get_slave_by_dev(bond, orig_dev);
+ if (!slave || !slave_do_arp_validate(bond, slave))
+ goto out_unlock;
+
+ /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
+ if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
+ (2 * dev->addr_len) +
+ (2 * sizeof(u32)))))
+ goto out_unlock;
+
+ arp = skb->nh.arph;
+ if (arp->ar_hln != dev->addr_len ||
+ skb->pkt_type == PACKET_OTHERHOST ||
+ skb->pkt_type == PACKET_LOOPBACK ||
+ arp->ar_hrd != htons(ARPHRD_ETHER) ||
+ arp->ar_pro != htons(ETH_P_IP) ||
+ arp->ar_pln != 4)
+ goto out_unlock;
+
+ arp_ptr = (unsigned char *)(arp + 1);
+ arp_ptr += dev->addr_len;
+ memcpy(&sip, arp_ptr, 4);
+ arp_ptr += 4 + dev->addr_len;
+ memcpy(&tip, arp_ptr, 4);
+
+ dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
+ " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
+ slave->state, bond->params.arp_validate,
+ slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
+
+ /*
+ * Backup slaves won't see the ARP reply, but do come through
+ * here for each ARP probe (so we swap the sip/tip to validate
+ * the probe). In a "redundant switch, common router" type of
+ * configuration, the ARP probe will (hopefully) travel from
+ * the active, through one switch, the router, then the other
+ * switch before reaching the backup.
+ */
+ if (slave->state == BOND_STATE_ACTIVE)
+ bond_validate_arp(bond, slave, sip, tip);
+ else
+ bond_validate_arp(bond, slave, tip, sip);
+
+out_unlock:
+ read_unlock(&bond->lock);
+out:
+ dev_kfree_skb(skb);
+ return NET_RX_SUCCESS;
+}
+
/*
* this function is called regularly to monitor each slave's link
* ensuring that traffic is being sent and received when arp monitoring
@@ -2600,7 +2720,8 @@
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
- if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
+ if ((jiffies - slave_last_rx(bond, slave)) <=
+ delta_in_ticks) {
slave->link = BOND_LINK_UP;
@@ -2645,7 +2766,7 @@
if ((slave != bond->curr_active_slave) &&
(!bond->current_arp_slave) &&
- (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
+ (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
bond_has_ip(bond))) {
/* a backup slave has gone down; three times
* the delta allows the current slave to be
@@ -2692,7 +2813,7 @@
* if it is up and needs to take over as the curr_active_slave
*/
if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
- (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
+ (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
bond_has_ip(bond))) &&
((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
@@ -3315,6 +3436,21 @@
dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
}
+void bond_register_arp(struct bonding *bond)
+{
+ struct packet_type *pt = &bond->arp_mon_pt;
+
+ pt->type = htons(ETH_P_ARP);
+ pt->dev = NULL; /*bond->dev;XXX*/
+ pt->func = bond_arp_rcv;
+ dev_add_pack(pt);
+}
+
+void bond_unregister_arp(struct bonding *bond)
+{
+ dev_remove_pack(&bond->arp_mon_pt);
+}
+
/*---------------------------- Hashing Policies -----------------------------*/
/*
@@ -3401,6 +3537,9 @@
} else {
arp_timer->function = (void *)&bond_loadbalance_arp_mon;
}
+ if (bond->params.arp_validate)
+ bond_register_arp(bond);
+
add_timer(arp_timer);
}
@@ -3428,6 +3567,9 @@
bond_unregister_lacpdu(bond);
}
+ if (bond->params.arp_validate)
+ bond_unregister_arp(bond);
+
write_lock_bh(&bond->lock);
@@ -4281,6 +4423,8 @@
static int bond_check_params(struct bond_params *params)
{
+ int arp_validate_value;
+
/*
* Convert string parameters.
*/
@@ -4484,6 +4628,29 @@
arp_interval = 0;
}
+ if (arp_validate) {
+ if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
+ printk(KERN_ERR DRV_NAME
+ ": arp_validate only supported in active-backup mode\n");
+ return -EINVAL;
+ }
+ if (!arp_interval) {
+ printk(KERN_ERR DRV_NAME
+ ": arp_validate requires arp_interval\n");
+ return -EINVAL;
+ }
+
+ arp_validate_value = bond_parse_parm(arp_validate,
+ arp_validate_tbl);
+ if (arp_validate_value == -1) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: invalid arp_validate \"%s\"\n",
+ arp_validate == NULL ? "NULL" : arp_validate);
+ return -EINVAL;
+ }
+ } else
+ arp_validate_value = 0;
+
if (miimon) {
printk(KERN_INFO DRV_NAME
": MII link monitoring set to %d ms\n",
@@ -4492,8 +4659,10 @@
int i;
printk(KERN_INFO DRV_NAME
- ": ARP monitoring set to %d ms with %d target(s):",
- arp_interval, arp_ip_count);
+ ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
+ arp_interval,
+ arp_validate_tbl[arp_validate_value].modename,
+ arp_ip_count);
for (i = 0; i < arp_ip_count; i++)
printk (" %s", arp_ip_target[i]);
@@ -4527,6 +4696,7 @@
params->xmit_policy = xmit_hashtype;
params->miimon = miimon;
params->arp_interval = arp_interval;
+ params->arp_validate = arp_validate_value;
params->updelay = updelay;
params->downdelay = downdelay;
params->use_carrier = use_carrier;