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[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>
This commit is contained in:
Jay Vosburgh
Jeff Garzik
parent
70298705bb
commit
f5b2b966f0
@ -192,6 +192,17 @@ or, for backwards compatibility, the option value. E.g.,
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arp_interval
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Specifies the ARP link monitoring frequency in milliseconds.
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The ARP monitor works by periodically checking the slave
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devices to determine whether they have sent or received
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traffic recently (the precise criteria depends upon the
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bonding mode, and the state of the slave). Regular traffic is
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generated via ARP probes issued for the addresses specified by
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the arp_ip_target option.
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This behavior can be modified by the arp_validate option,
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below.
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If ARP monitoring is used in an etherchannel compatible mode
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(modes 0 and 2), the switch should be configured in a mode
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that evenly distributes packets across all links. If the
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@ -213,6 +224,54 @@ arp_ip_target
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maximum number of targets that can be specified is 16. The
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default value is no IP addresses.
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arp_validate
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Specifies whether or not ARP probes and replies should be
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validated in the active-backup mode. This causes the ARP
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monitor to examine the incoming ARP requests and replies, and
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only consider a slave to be up if it is receiving the
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appropriate ARP traffic.
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Possible values are:
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none or 0
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No validation is performed. This is the default.
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active or 1
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Validation is performed only for the active slave.
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backup or 2
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Validation is performed only for backup slaves.
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all or 3
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Validation is performed for all slaves.
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For the active slave, the validation checks ARP replies to
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confirm that they were generated by an arp_ip_target. Since
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backup slaves do not typically receive these replies, the
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validation performed for backup slaves is on the ARP request
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sent out via the active slave. It is possible that some
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switch or network configurations may result in situations
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wherein the backup slaves do not receive the ARP requests; in
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such a situation, validation of backup slaves must be
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disabled.
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This option is useful in network configurations in which
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multiple bonding hosts are concurrently issuing ARPs to one or
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more targets beyond a common switch. Should the link between
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the switch and target fail (but not the switch itself), the
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probe traffic generated by the multiple bonding instances will
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fool the standard ARP monitor into considering the links as
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still up. Use of the arp_validate option can resolve this, as
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the ARP monitor will only consider ARP requests and replies
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associated with its own instance of bonding.
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This option was added in bonding version 3.1.0.
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downdelay
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Specifies the time, in milliseconds, to wait before disabling
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@ -96,6 +96,7 @@ static char *lacp_rate = NULL;
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static char *xmit_hash_policy = NULL;
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static int arp_interval = BOND_LINK_ARP_INTERV;
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static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
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static char *arp_validate = NULL;
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struct bond_params bonding_defaults;
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module_param(max_bonds, int, 0);
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@ -127,6 +128,8 @@ module_param(arp_interval, int, 0);
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MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
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module_param_array(arp_ip_target, charp, NULL, 0);
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MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
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module_param(arp_validate, charp, 0);
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MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
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/*----------------------------- Global variables ----------------------------*/
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@ -170,6 +173,14 @@ struct bond_parm_tbl xmit_hashtype_tbl[] = {
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{ NULL, -1},
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};
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struct bond_parm_tbl arp_validate_tbl[] = {
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{ "none", BOND_ARP_VALIDATE_NONE},
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{ "active", BOND_ARP_VALIDATE_ACTIVE},
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{ "backup", BOND_ARP_VALIDATE_BACKUP},
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{ "all", BOND_ARP_VALIDATE_ALL},
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{ NULL, -1},
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};
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/*-------------------------- Forward declarations ---------------------------*/
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static void bond_send_gratuitous_arp(struct bonding *bond);
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@ -1424,6 +1435,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
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bond_compute_features(bond);
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new_slave->last_arp_rx = jiffies;
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if (bond->params.miimon && !bond->params.use_carrier) {
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link_reporting = bond_check_dev_link(bond, slave_dev, 1);
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@ -1785,7 +1798,8 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
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dev_set_mac_address(slave_dev, &addr);
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slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
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IFF_SLAVE_INACTIVE | IFF_BONDING);
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IFF_SLAVE_INACTIVE | IFF_BONDING |
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IFF_SLAVE_NEEDARP);
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kfree(slave);
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@ -2298,6 +2312,25 @@ static int bond_has_ip(struct bonding *bond)
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return 0;
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}
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static int bond_has_this_ip(struct bonding *bond, u32 ip)
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{
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struct vlan_entry *vlan, *vlan_next;
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if (ip == bond->master_ip)
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return 1;
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if (list_empty(&bond->vlan_list))
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return 0;
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list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
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vlan_list) {
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if (ip == vlan->vlan_ip)
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return 1;
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}
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return 0;
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}
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/*
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* We go to the (large) trouble of VLAN tagging ARP frames because
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* switches in VLAN mode (especially if ports are configured as
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@ -2436,6 +2469,93 @@ static void bond_send_gratuitous_arp(struct bonding *bond)
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}
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}
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static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
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{
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int i;
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u32 *targets = bond->params.arp_targets;
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targets = bond->params.arp_targets;
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for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
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dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
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"%u.%u.%u.%u bhti(tip) %d\n",
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NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
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bond_has_this_ip(bond, tip));
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if (sip == targets[i]) {
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if (bond_has_this_ip(bond, tip))
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slave->last_arp_rx = jiffies;
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return;
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}
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}
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}
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static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
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{
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struct arphdr *arp;
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struct slave *slave;
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struct bonding *bond;
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unsigned char *arp_ptr;
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u32 sip, tip;
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if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
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goto out;
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bond = dev->priv;
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read_lock(&bond->lock);
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dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
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bond->dev->name, skb->dev ? skb->dev->name : "NULL",
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orig_dev ? orig_dev->name : "NULL");
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slave = bond_get_slave_by_dev(bond, orig_dev);
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if (!slave || !slave_do_arp_validate(bond, slave))
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goto out_unlock;
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/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
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if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
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(2 * dev->addr_len) +
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(2 * sizeof(u32)))))
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goto out_unlock;
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arp = skb->nh.arph;
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if (arp->ar_hln != dev->addr_len ||
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skb->pkt_type == PACKET_OTHERHOST ||
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skb->pkt_type == PACKET_LOOPBACK ||
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arp->ar_hrd != htons(ARPHRD_ETHER) ||
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arp->ar_pro != htons(ETH_P_IP) ||
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arp->ar_pln != 4)
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goto out_unlock;
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arp_ptr = (unsigned char *)(arp + 1);
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arp_ptr += dev->addr_len;
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memcpy(&sip, arp_ptr, 4);
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arp_ptr += 4 + dev->addr_len;
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memcpy(&tip, arp_ptr, 4);
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dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
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" tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
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slave->state, bond->params.arp_validate,
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slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
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/*
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* Backup slaves won't see the ARP reply, but do come through
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* here for each ARP probe (so we swap the sip/tip to validate
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* the probe). In a "redundant switch, common router" type of
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* configuration, the ARP probe will (hopefully) travel from
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* the active, through one switch, the router, then the other
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* switch before reaching the backup.
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*/
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if (slave->state == BOND_STATE_ACTIVE)
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bond_validate_arp(bond, slave, sip, tip);
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else
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bond_validate_arp(bond, slave, tip, sip);
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out_unlock:
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read_unlock(&bond->lock);
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out:
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dev_kfree_skb(skb);
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return NET_RX_SUCCESS;
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}
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/*
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* this function is called regularly to monitor each slave's link
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* ensuring that traffic is being sent and received when arp monitoring
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@ -2600,7 +2720,8 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
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*/
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bond_for_each_slave(bond, slave, i) {
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if (slave->link != BOND_LINK_UP) {
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if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
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if ((jiffies - slave_last_rx(bond, slave)) <=
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delta_in_ticks) {
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slave->link = BOND_LINK_UP;
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@ -2645,7 +2766,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
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if ((slave != bond->curr_active_slave) &&
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(!bond->current_arp_slave) &&
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(((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
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(((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
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bond_has_ip(bond))) {
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/* a backup slave has gone down; three times
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* the delta allows the current slave to be
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@ -2692,7 +2813,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
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* if it is up and needs to take over as the curr_active_slave
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*/
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if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
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(((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
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(((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
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bond_has_ip(bond))) &&
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((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
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@ -3315,6 +3436,21 @@ static void bond_unregister_lacpdu(struct bonding *bond)
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dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
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}
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void bond_register_arp(struct bonding *bond)
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{
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struct packet_type *pt = &bond->arp_mon_pt;
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pt->type = htons(ETH_P_ARP);
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pt->dev = NULL; /*bond->dev;XXX*/
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pt->func = bond_arp_rcv;
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dev_add_pack(pt);
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}
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void bond_unregister_arp(struct bonding *bond)
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{
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dev_remove_pack(&bond->arp_mon_pt);
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}
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/*---------------------------- Hashing Policies -----------------------------*/
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/*
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@ -3401,6 +3537,9 @@ static int bond_open(struct net_device *bond_dev)
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} else {
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arp_timer->function = (void *)&bond_loadbalance_arp_mon;
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}
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if (bond->params.arp_validate)
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bond_register_arp(bond);
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add_timer(arp_timer);
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}
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@ -3428,6 +3567,9 @@ static int bond_close(struct net_device *bond_dev)
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bond_unregister_lacpdu(bond);
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}
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if (bond->params.arp_validate)
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bond_unregister_arp(bond);
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write_lock_bh(&bond->lock);
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@ -4281,6 +4423,8 @@ int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
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static int bond_check_params(struct bond_params *params)
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{
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int arp_validate_value;
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/*
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* Convert string parameters.
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*/
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@ -4484,6 +4628,29 @@ static int bond_check_params(struct bond_params *params)
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arp_interval = 0;
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}
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if (arp_validate) {
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if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
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printk(KERN_ERR DRV_NAME
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": arp_validate only supported in active-backup mode\n");
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return -EINVAL;
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}
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if (!arp_interval) {
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printk(KERN_ERR DRV_NAME
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": arp_validate requires arp_interval\n");
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return -EINVAL;
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}
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arp_validate_value = bond_parse_parm(arp_validate,
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arp_validate_tbl);
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if (arp_validate_value == -1) {
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printk(KERN_ERR DRV_NAME
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": Error: invalid arp_validate \"%s\"\n",
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arp_validate == NULL ? "NULL" : arp_validate);
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return -EINVAL;
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}
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} else
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arp_validate_value = 0;
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if (miimon) {
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printk(KERN_INFO DRV_NAME
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": MII link monitoring set to %d ms\n",
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@ -4492,8 +4659,10 @@ static int bond_check_params(struct bond_params *params)
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int i;
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printk(KERN_INFO DRV_NAME
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": ARP monitoring set to %d ms with %d target(s):",
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arp_interval, arp_ip_count);
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": ARP monitoring set to %d ms, validate %s, with %d target(s):",
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arp_interval,
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arp_validate_tbl[arp_validate_value].modename,
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arp_ip_count);
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for (i = 0; i < arp_ip_count; i++)
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printk (" %s", arp_ip_target[i]);
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@ -4527,6 +4696,7 @@ static int bond_check_params(struct bond_params *params)
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params->xmit_policy = xmit_hashtype;
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params->miimon = miimon;
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params->arp_interval = arp_interval;
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params->arp_validate = arp_validate_value;
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params->updelay = updelay;
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params->downdelay = downdelay;
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params->use_carrier = use_carrier;
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@ -51,6 +51,7 @@ extern struct bond_params bonding_defaults;
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extern struct bond_parm_tbl bond_mode_tbl[];
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extern struct bond_parm_tbl bond_lacp_tbl[];
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extern struct bond_parm_tbl xmit_hashtype_tbl[];
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extern struct bond_parm_tbl arp_validate_tbl[];
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static int expected_refcount = -1;
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static struct class *netdev_class;
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@ -502,6 +503,53 @@ out:
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}
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static CLASS_DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
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/*
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* Show and set arp_validate.
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*/
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static ssize_t bonding_show_arp_validate(struct class_device *cd, char *buf)
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{
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struct bonding *bond = to_bond(cd);
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return sprintf(buf, "%s %d\n",
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arp_validate_tbl[bond->params.arp_validate].modename,
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bond->params.arp_validate) + 1;
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}
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static ssize_t bonding_store_arp_validate(struct class_device *cd, const char *buf, size_t count)
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{
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int new_value;
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struct bonding *bond = to_bond(cd);
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new_value = bond_parse_parm((char *)buf, arp_validate_tbl);
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if (new_value < 0) {
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printk(KERN_ERR DRV_NAME
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": %s: Ignoring invalid arp_validate value %s\n",
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bond->dev->name, buf);
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return -EINVAL;
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}
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if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
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printk(KERN_ERR DRV_NAME
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": %s: arp_validate only supported in active-backup mode.\n",
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bond->dev->name);
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return -EINVAL;
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}
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printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
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bond->dev->name, arp_validate_tbl[new_value].modename,
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new_value);
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if (!bond->params.arp_validate && new_value) {
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bond_register_arp(bond);
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} else if (bond->params.arp_validate && !new_value) {
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bond_unregister_arp(bond);
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}
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bond->params.arp_validate = new_value;
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return count;
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}
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static CLASS_DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
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/*
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* Show and set the arp timer interval. There are two tricky bits
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* here. First, if ARP monitoring is activated, then we must disable
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@ -914,6 +962,11 @@ static ssize_t bonding_store_miimon(struct class_device *cd, const char *buf, si
|
||||
"ARP monitoring. Disabling ARP monitoring...\n",
|
||||
bond->dev->name);
|
||||
bond->params.arp_interval = 0;
|
||||
if (bond->params.arp_validate) {
|
||||
bond_unregister_arp(bond);
|
||||
bond->params.arp_validate =
|
||||
BOND_ARP_VALIDATE_NONE;
|
||||
}
|
||||
/* Kill ARP timer, else it brings bond's link down */
|
||||
if (bond->mii_timer.function) {
|
||||
printk(KERN_INFO DRV_NAME
|
||||
@ -1273,6 +1326,7 @@ static CLASS_DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, N
|
||||
static struct attribute *per_bond_attrs[] = {
|
||||
&class_device_attr_slaves.attr,
|
||||
&class_device_attr_mode.attr,
|
||||
&class_device_attr_arp_validate.attr,
|
||||
&class_device_attr_arp_interval.attr,
|
||||
&class_device_attr_arp_ip_target.attr,
|
||||
&class_device_attr_downdelay.attr,
|
||||
|
||||
@ -22,8 +22,8 @@
|
||||
#include "bond_3ad.h"
|
||||
#include "bond_alb.h"
|
||||
|
||||
#define DRV_VERSION "3.0.3"
|
||||
#define DRV_RELDATE "March 23, 2006"
|
||||
#define DRV_VERSION "3.1.0-test"
|
||||
#define DRV_RELDATE "September 9, 2006"
|
||||
#define DRV_NAME "bonding"
|
||||
#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
|
||||
|
||||
@ -126,6 +126,7 @@ struct bond_params {
|
||||
int xmit_policy;
|
||||
int miimon;
|
||||
int arp_interval;
|
||||
int arp_validate;
|
||||
int use_carrier;
|
||||
int updelay;
|
||||
int downdelay;
|
||||
@ -151,6 +152,7 @@ struct slave {
|
||||
struct slave *prev;
|
||||
int delay;
|
||||
u32 jiffies;
|
||||
u32 last_arp_rx;
|
||||
s8 link; /* one of BOND_LINK_XXXX */
|
||||
s8 state; /* one of BOND_STATE_XXXX */
|
||||
u32 original_flags;
|
||||
@ -198,6 +200,7 @@ struct bonding {
|
||||
struct bond_params params;
|
||||
struct list_head vlan_list;
|
||||
struct vlan_group *vlgrp;
|
||||
struct packet_type arp_mon_pt;
|
||||
};
|
||||
|
||||
/**
|
||||
@ -228,6 +231,25 @@ static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
|
||||
return (struct bonding *)slave->dev->master->priv;
|
||||
}
|
||||
|
||||
#define BOND_ARP_VALIDATE_NONE 0
|
||||
#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
|
||||
#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
|
||||
#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
|
||||
BOND_ARP_VALIDATE_BACKUP)
|
||||
|
||||
extern inline int slave_do_arp_validate(struct bonding *bond, struct slave *slave)
|
||||
{
|
||||
return bond->params.arp_validate & (1 << slave->state);
|
||||
}
|
||||
|
||||
extern inline u32 slave_last_rx(struct bonding *bond, struct slave *slave)
|
||||
{
|
||||
if (slave_do_arp_validate(bond, slave))
|
||||
return slave->last_arp_rx;
|
||||
|
||||
return slave->dev->last_rx;
|
||||
}
|
||||
|
||||
static inline void bond_set_slave_inactive_flags(struct slave *slave)
|
||||
{
|
||||
struct bonding *bond = slave->dev->master->priv;
|
||||
@ -235,12 +257,14 @@ static inline void bond_set_slave_inactive_flags(struct slave *slave)
|
||||
bond->params.mode != BOND_MODE_ALB)
|
||||
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;
|
||||
slave->dev->priv_flags &= ~(IFF_SLAVE_INACTIVE | IFF_SLAVE_NEEDARP);
|
||||
}
|
||||
|
||||
static inline void bond_set_master_3ad_flags(struct bonding *bond)
|
||||
@ -284,6 +308,8 @@ int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl);
|
||||
const char *bond_mode_name(int mode);
|
||||
void bond_select_active_slave(struct bonding *bond);
|
||||
void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
|
||||
void bond_register_arp(struct bonding *);
|
||||
void bond_unregister_arp(struct bonding *);
|
||||
|
||||
#endif /* _LINUX_BONDING_H */
|
||||
|
||||
|
||||
@ -60,6 +60,7 @@
|
||||
#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 IF_GET_IFACE 0x0001 /* for querying only */
|
||||
#define IF_GET_PROTO 0x0002
|
||||
|
||||
@ -1016,7 +1016,8 @@ static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
|
||||
}
|
||||
|
||||
/* On bonding slaves other than the currently active slave, suppress
|
||||
* duplicates except for 802.3ad ETH_P_SLOW and alb non-mcast/bcast.
|
||||
* duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
|
||||
* ARP on active-backup slaves with arp_validate enabled.
|
||||
*/
|
||||
static inline int skb_bond_should_drop(struct sk_buff *skb)
|
||||
{
|
||||
@ -1025,6 +1026,10 @@ static inline int skb_bond_should_drop(struct sk_buff *skb)
|
||||
|
||||
if (master &&
|
||||
(dev->priv_flags & IFF_SLAVE_INACTIVE)) {
|
||||
if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
|
||||
skb->protocol == __constant_htons(ETH_P_ARP))
|
||||
return 0;
|
||||
|
||||
if (master->priv_flags & IFF_MASTER_ALB) {
|
||||
if (skb->pkt_type != PACKET_BROADCAST &&
|
||||
skb->pkt_type != PACKET_MULTICAST)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user