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googlers / maze / linux / eeb91e4f9d578a6a8cc25a9603d4d62f2ec00db5 / . / drivers / net / bonding / bond_main.c
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/*
* originally based on the dummy device.
*
* Copyright 1999, Thomas Davis, tadavis@lbl.gov.
* Licensed under the GPL. Based on dummy.c, and eql.c devices.
*
* bonding.c: an Ethernet Bonding driver
*
* This is useful to talk to a Cisco EtherChannel compatible equipment:
* Cisco 5500
* Sun Trunking (Solaris)
* Alteon AceDirector Trunks
* Linux Bonding
* and probably many L2 switches ...
*
* How it works:
* ifconfig bond0 ipaddress netmask up
* will setup a network device, with an ip address. No mac address
* will be assigned at this time. The hw mac address will come from
* the first slave bonded to the channel. All slaves will then use
* this hw mac address.
*
* ifconfig bond0 down
* will release all slaves, marking them as down.
*
* ifenslave bond0 eth0
* will attach eth0 to bond0 as a slave. eth0 hw mac address will either
* a: be used as initial mac address
* b: if a hw mac address already is there, eth0's hw mac address
* will then be set from bond0.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <net/ip.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <asm/dma.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include <linux/jiffies.h>
#include <linux/preempt.h>
#include <net/route.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/pkt_sched.h>
#include <linux/rculist.h>
#include <net/flow_keys.h>
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"
/*---------------------------- Module parameters ----------------------------*/
/* monitor all links that often (in milliseconds). <=0 disables monitoring */
static int max_bonds = BOND_DEFAULT_MAX_BONDS;
static int tx_queues = BOND_DEFAULT_TX_QUEUES;
static int num_peer_notif = 1;
static int miimon;
static int updelay;
static int downdelay;
static int use_carrier = 1;
static char *mode;
static char *primary;
static char *primary_reselect;
static char *lacp_rate;
static int min_links;
static char *ad_select;
static char *xmit_hash_policy;
static int arp_interval;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *arp_all_targets;
static char *fail_over_mac;
static int all_slaves_active;
static struct bond_params bonding_defaults;
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
static int packets_per_slave = 1;
static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
module_param_named(num_grat_arp, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
"failover event (alias of num_unsol_na)");
module_param_named(num_unsol_na, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
"failover event (alias of num_grat_arp)");
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
"in milliseconds");
module_param(use_carrier, int, 0);
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
"0 for off, 1 for on (default)");
module_param(mode, charp, 0);
MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
"1 for active-backup, 2 for balance-xor, "
"3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
"6 for balance-alb");
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(primary_reselect, charp, 0);
MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
"once it comes up; "
"0 for always (default), "
"1 for only if speed of primary is "
"better, "
"2 for only on active slave "
"failure");
module_param(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
"0 for slow, 1 for fast");
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
"0 for stable (default), 1 for bandwidth, "
"2 for count");
module_param(min_links, int, 0);
MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
"0 for layer 2 (default), 1 for layer 3+4, "
"2 for layer 2+3, 3 for encap layer 2+3, "
"4 for encap layer 3+4");
module_param(arp_interval, int, 0);
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; "
"0 for none (default), 1 for active, "
"2 for backup, 3 for all");
module_param(arp_all_targets, charp, 0);
MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
"the same MAC; 0 for none (default), "
"1 for active, 2 for follow");
module_param(all_slaves_active, int, 0);
MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
"by setting active flag for all slaves; "
"0 for never (default), 1 for always.");
module_param(resend_igmp, int, 0);
MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
"link failure");
module_param(packets_per_slave, int, 0);
MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
"mode; 0 for a random slave, 1 packet per "
"slave (default), >1 packets per slave.");
module_param(lp_interval, uint, 0);
MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
"the bonding driver sends learning packets to "
"each slaves peer switch. The default is 1.");
/*----------------------------- Global variables ----------------------------*/
#ifdef CONFIG_NET_POLL_CONTROLLER
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
#endif
int bond_net_id __read_mostly;
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
/*-------------------------- Forward declarations ---------------------------*/
static int bond_init(struct net_device *bond_dev);
static void bond_uninit(struct net_device *bond_dev);
/*---------------------------- General routines -----------------------------*/
const char *bond_mode_name(int mode)
{
static const char *names[] = {
[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
[BOND_MODE_XOR] = "load balancing (xor)",
[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
[BOND_MODE_TLB] = "transmit load balancing",
[BOND_MODE_ALB] = "adaptive load balancing",
};
if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
return "unknown";
return names[mode];
}
/*---------------------------------- VLAN -----------------------------------*/
/**
* bond_dev_queue_xmit - Prepare skb for xmit.
*
* @bond: bond device that got this skb for tx.
* @skb: hw accel VLAN tagged skb to transmit
* @slave_dev: slave that is supposed to xmit this skbuff
*/
void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
struct net_device *slave_dev)
{
skb->dev = slave_dev;
BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
if (unlikely(netpoll_tx_running(bond->dev)))
bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
else
dev_queue_xmit(skb);
}
/*
* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
* We don't protect the slave list iteration with a lock because:
* a. This operation is performed in IOCTL context,
* b. The operation is protected by the RTNL semaphore in the 8021q code,
* c. Holding a lock with BH disabled while directly calling a base driver
* entry point is generally a BAD idea.
*
* The design of synchronization/protection for this operation in the 8021q
* module is good for one or more VLAN devices over a single physical device
* and cannot be extended for a teaming solution like bonding, so there is a
* potential race condition here where a net device from the vlan group might
* be referenced (either by a base driver or the 8021q code) while it is being
* removed from the system. However, it turns out we're not making matters
* worse, and if it works for regular VLAN usage it will work here too.
*/
/**
* bond_vlan_rx_add_vid - Propagates adding an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being added
*/
static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
__be16 proto, u16 vid)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *rollback_slave;
struct list_head *iter;
int res;
bond_for_each_slave(bond, slave, iter) {
res = vlan_vid_add(slave->dev, proto, vid);
if (res)
goto unwind;
}
return 0;
unwind:
/* unwind to the slave that failed */
bond_for_each_slave(bond, rollback_slave, iter) {
if (rollback_slave == slave)
break;
vlan_vid_del(rollback_slave->dev, proto, vid);
}
return res;
}
/**
* bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being removed
*/
static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
__be16 proto, u16 vid)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter)
vlan_vid_del(slave->dev, proto, vid);
if (bond_is_lb(bond))
bond_alb_clear_vlan(bond, vid);
return 0;
}
/*------------------------------- Link status -------------------------------*/
/*
* Set the carrier state for the master according to the state of its
* slaves. If any slaves are up, the master is up. In 802.3ad mode,
* do special 802.3ad magic.
*
* Returns zero if carrier state does not change, nonzero if it does.
*/
static int bond_set_carrier(struct bonding *bond)
{
struct list_head *iter;
struct slave *slave;
if (!bond_has_slaves(bond))
goto down;
if (bond->params.mode == BOND_MODE_8023AD)
return bond_3ad_set_carrier(bond);
bond_for_each_slave(bond, slave, iter) {
if (slave->link == BOND_LINK_UP) {
if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
return 1;
}
return 0;
}
}
down:
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
return 1;
}
return 0;
}
/*
* Get link speed and duplex from the slave's base driver
* using ethtool. If for some reason the call fails or the
* values are invalid, set speed and duplex to -1,
* and return.
*/
static void bond_update_speed_duplex(struct slave *slave)
{
struct net_device *slave_dev = slave->dev;
struct ethtool_cmd ecmd;
u32 slave_speed;
int res;
slave->speed = SPEED_UNKNOWN;
slave->duplex = DUPLEX_UNKNOWN;
res = __ethtool_get_settings(slave_dev, &ecmd);
if (res < 0)
return;
slave_speed = ethtool_cmd_speed(&ecmd);
if (slave_speed == 0 || slave_speed == ((__u32) -1))
return;
switch (ecmd.duplex) {
case DUPLEX_FULL:
case DUPLEX_HALF:
break;
default:
return;
}
slave->speed = slave_speed;
slave->duplex = ecmd.duplex;
return;
}
const char *bond_slave_link_status(s8 link)
{
switch (link) {
case BOND_LINK_UP:
return "up";
case BOND_LINK_FAIL:
return "going down";
case BOND_LINK_DOWN:
return "down";
case BOND_LINK_BACK:
return "going back";
default:
return "unknown";
}
}
/*
* if <dev> supports MII link status reporting, check its link status.
*
* We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
* depending upon the setting of the use_carrier parameter.
*
* Return either BMSR_LSTATUS, meaning that the link is up (or we
* can't tell and just pretend it is), or 0, meaning that the link is
* down.
*
* If reporting is non-zero, instead of faking link up, return -1 if
* both ETHTOOL and MII ioctls fail (meaning the device does not
* support them). If use_carrier is set, return whatever it says.
* It'd be nice if there was a good way to tell if a driver supports
* netif_carrier, but there really isn't.
*/
static int bond_check_dev_link(struct bonding *bond,
struct net_device *slave_dev, int reporting)
{
const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
int (*ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct mii_ioctl_data *mii;
if (!reporting && !netif_running(slave_dev))
return 0;
if (bond->params.use_carrier)
return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
/* Try to get link status using Ethtool first. */
if (slave_dev->ethtool_ops->get_link)
return slave_dev->ethtool_ops->get_link(slave_dev) ?
BMSR_LSTATUS : 0;
/* Ethtool can't be used, fallback to MII ioctls. */
ioctl = slave_ops->ndo_do_ioctl;
if (ioctl) {
/* TODO: set pointer to correct ioctl on a per team member */
/* bases to make this more efficient. that is, once */
/* we determine the correct ioctl, we will always */
/* call it and not the others for that team */
/* member. */
/*
* We cannot assume that SIOCGMIIPHY will also read a
* register; not all network drivers (e.g., e100)
* support that.
*/
/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
mii = if_mii(&ifr);
if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
mii->reg_num = MII_BMSR;
if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
return mii->val_out & BMSR_LSTATUS;
}
}
/*
* If reporting, report that either there's no dev->do_ioctl,
* or both SIOCGMIIREG and get_link failed (meaning that we
* cannot report link status). If not reporting, pretend
* we're ok.
*/
return reporting ? -1 : BMSR_LSTATUS;
}
/*----------------------------- Multicast list ------------------------------*/
/*
* Push the promiscuity flag down to appropriate slaves
*/
static int bond_set_promiscuity(struct bonding *bond, int inc)
{
struct list_head *iter;
int err = 0;
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
err = dev_set_promiscuity(bond->curr_active_slave->dev,
inc);
}
} else {
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
err = dev_set_promiscuity(slave->dev, inc);
if (err)
return err;
}
}
return err;
}
/*
* Push the allmulti flag down to all slaves
*/
static int bond_set_allmulti(struct bonding *bond, int inc)
{
struct list_head *iter;
int err = 0;
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
err = dev_set_allmulti(bond->curr_active_slave->dev,
inc);
}
} else {
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
err = dev_set_allmulti(slave->dev, inc);
if (err)
return err;
}
}
return err;
}
/*
* Retrieve the list of registered multicast addresses for the bonding
* device and retransmit an IGMP JOIN request to the current active
* slave.
*/
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
mcast_work.work);
if (!rtnl_trylock()) {
queue_delayed_work(bond->wq, &bond->mcast_work, 1);
return;
}
call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
if (bond->igmp_retrans > 1) {
bond->igmp_retrans--;
queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
}
rtnl_unlock();
}
/* Flush bond's hardware addresses from slave
*/
static void bond_hw_addr_flush(struct net_device *bond_dev,
struct net_device *slave_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
dev_uc_unsync(slave_dev, bond_dev);
dev_mc_unsync(slave_dev, bond_dev);
if (bond->params.mode == BOND_MODE_8023AD) {
/* del lacpdu mc addr from mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_del(slave_dev, lacpdu_multicast);
}
}
/*--------------------------- Active slave change ---------------------------*/
/* Update the hardware address list and promisc/allmulti for the new and
* old active slaves (if any). Modes that are !USES_PRIMARY keep all
* slaves up date at all times; only the USES_PRIMARY modes need to call
* this function to swap these settings during a failover.
*/
static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
struct slave *old_active)
{
ASSERT_RTNL();
if (old_active) {
if (bond->dev->flags & IFF_PROMISC)
dev_set_promiscuity(old_active->dev, -1);
if (bond->dev->flags & IFF_ALLMULTI)
dev_set_allmulti(old_active->dev, -1);
bond_hw_addr_flush(bond->dev, old_active->dev);
}
if (new_active) {
/* FIXME: Signal errors upstream. */
if (bond->dev->flags & IFF_PROMISC)
dev_set_promiscuity(new_active->dev, 1);
if (bond->dev->flags & IFF_ALLMULTI)
dev_set_allmulti(new_active->dev, 1);
netif_addr_lock_bh(bond->dev);
dev_uc_sync(new_active->dev, bond->dev);
dev_mc_sync(new_active->dev, bond->dev);
netif_addr_unlock_bh(bond->dev);
}
}
/**
* bond_set_dev_addr - clone slave's address to bond
* @bond_dev: bond net device
* @slave_dev: slave net device
*
* Should be called with RTNL held.
*/
static void bond_set_dev_addr(struct net_device *bond_dev,
struct net_device *slave_dev)
{
pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
bond_dev, slave_dev, slave_dev->addr_len);
memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
bond_dev->addr_assign_type = NET_ADDR_STOLEN;
call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
}
/*
* bond_do_fail_over_mac
*
* Perform special MAC address swapping for fail_over_mac settings
*
* Called with RTNL, curr_slave_lock for write_bh.
*/
static void bond_do_fail_over_mac(struct bonding *bond,
struct slave *new_active,
struct slave *old_active)
__releases(&bond->curr_slave_lock)
__acquires(&bond->curr_slave_lock)
{
u8 tmp_mac[ETH_ALEN];
struct sockaddr saddr;
int rv;
switch (bond->params.fail_over_mac) {
case BOND_FOM_ACTIVE:
if (new_active) {
write_unlock_bh(&bond->curr_slave_lock);
bond_set_dev_addr(bond->dev, new_active->dev);
write_lock_bh(&bond->curr_slave_lock);
}
break;
case BOND_FOM_FOLLOW:
/*
* if new_active && old_active, swap them
* if just old_active, do nothing (going to no active slave)
* if just new_active, set new_active to bond's MAC
*/
if (!new_active)
return;
write_unlock_bh(&bond->curr_slave_lock);
if (old_active) {
ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
ether_addr_copy(saddr.sa_data,
old_active->dev->dev_addr);
saddr.sa_family = new_active->dev->type;
} else {
ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
saddr.sa_family = bond->dev->type;
}
rv = dev_set_mac_address(new_active->dev, &saddr);
if (rv) {
pr_err("%s: Error %d setting MAC of slave %s\n",
bond->dev->name, -rv, new_active->dev->name);
goto out;
}
if (!old_active)
goto out;
ether_addr_copy(saddr.sa_data, tmp_mac);
saddr.sa_family = old_active->dev->type;
rv = dev_set_mac_address(old_active->dev, &saddr);
if (rv)
pr_err("%s: Error %d setting MAC of slave %s\n",
bond->dev->name, -rv, new_active->dev->name);
out:
write_lock_bh(&bond->curr_slave_lock);
break;
default:
pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
bond->dev->name, bond->params.fail_over_mac);
break;
}
}
static bool bond_should_change_active(struct bonding *bond)
{
struct slave *prim = bond->primary_slave;
struct slave *curr = bond->curr_active_slave;
if (!prim || !curr || curr->link != BOND_LINK_UP)
return true;
if (bond->force_primary) {
bond->force_primary = false;
return true;
}
if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
(prim->speed < curr->speed ||
(prim->speed == curr->speed && prim->duplex <= curr->duplex)))
return false;
if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
return false;
return true;
}
/**
* find_best_interface - select the best available slave to be the active one
* @bond: our bonding struct
*/
static struct slave *bond_find_best_slave(struct bonding *bond)
{
struct slave *slave, *bestslave = NULL;
struct list_head *iter;
int mintime = bond->params.updelay;
if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
bond_should_change_active(bond))
return bond->primary_slave;
bond_for_each_slave(bond, slave, iter) {
if (slave->link == BOND_LINK_UP)
return slave;
if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
slave->delay < mintime) {
mintime = slave->delay;
bestslave = slave;
}
}
return bestslave;
}
static bool bond_should_notify_peers(struct bonding *bond)
{
struct slave *slave;
rcu_read_lock();
slave = rcu_dereference(bond->curr_active_slave);
rcu_read_unlock();
pr_debug("bond_should_notify_peers: bond %s slave %s\n",
bond->dev->name, slave ? slave->dev->name : "NULL");
if (!slave || !bond->send_peer_notif ||
test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
return false;
return true;
}
/**
* change_active_interface - change the active slave into the specified one
* @bond: our bonding struct
* @new: the new slave to make the active one
*
* Set the new slave to the bond's settings and unset them on the old
* curr_active_slave.
* Setting include flags, mc-list, promiscuity, allmulti, etc.
*
* If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
* because it is apparently the best available slave we have, even though its
* updelay hasn't timed out yet.
*
* If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
*/
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
{
struct slave *old_active = bond->curr_active_slave;
if (old_active == new_active)
return;
if (new_active) {
new_active->last_link_up = jiffies;
if (new_active->link == BOND_LINK_BACK) {
if (USES_PRIMARY(bond->params.mode)) {
pr_info("%s: making interface %s the new active one %d ms earlier\n",
bond->dev->name, new_active->dev->name,
(bond->params.updelay - new_active->delay) * bond->params.miimon);
}
new_active->delay = 0;
new_active->link = BOND_LINK_UP;
if (bond->params.mode == BOND_MODE_8023AD)
bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
if (bond_is_lb(bond))
bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
} else {
if (USES_PRIMARY(bond->params.mode)) {
pr_info("%s: making interface %s the new active one\n",
bond->dev->name, new_active->dev->name);
}
}
}
if (USES_PRIMARY(bond->params.mode))
bond_hw_addr_swap(bond, new_active, old_active);
if (bond_is_lb(bond)) {
bond_alb_handle_active_change(bond, new_active);
if (old_active)
bond_set_slave_inactive_flags(old_active,
BOND_SLAVE_NOTIFY_NOW);
if (new_active)
bond_set_slave_active_flags(new_active,
BOND_SLAVE_NOTIFY_NOW);
} else {
rcu_assign_pointer(bond->curr_active_slave, new_active);
}
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
if (old_active)
bond_set_slave_inactive_flags(old_active,
BOND_SLAVE_NOTIFY_NOW);
if (new_active) {
bool should_notify_peers = false;
bond_set_slave_active_flags(new_active,
BOND_SLAVE_NOTIFY_NOW);
if (bond->params.fail_over_mac)
bond_do_fail_over_mac(bond, new_active,
old_active);
if (netif_running(bond->dev)) {
bond->send_peer_notif =
bond->params.num_peer_notif;
should_notify_peers =
bond_should_notify_peers(bond);
}
write_unlock_bh(&bond->curr_slave_lock);
call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
if (should_notify_peers)
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
bond->dev);
write_lock_bh(&bond->curr_slave_lock);
}
}
/* resend IGMP joins since active slave has changed or
* all were sent on curr_active_slave.
* resend only if bond is brought up with the affected
* bonding modes and the retransmission is enabled */
if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
((USES_PRIMARY(bond->params.mode) && new_active) ||
bond->params.mode == BOND_MODE_ROUNDROBIN)) {
bond->igmp_retrans = bond->params.resend_igmp;
queue_delayed_work(bond->wq, &bond->mcast_work, 1);
}
}
/**
* bond_select_active_slave - select a new active slave, if needed
* @bond: our bonding struct
*
* This functions should be called when one of the following occurs:
* - The old curr_active_slave has been released or lost its link.
* - The primary_slave has got its link back.
* - A slave has got its link back and there's no old curr_active_slave.
*
* Caller must hold curr_slave_lock for write_bh.
*/
void bond_select_active_slave(struct bonding *bond)
{
struct slave *best_slave;
int rv;
best_slave = bond_find_best_slave(bond);
if (best_slave != bond->curr_active_slave) {
bond_change_active_slave(bond, best_slave);
rv = bond_set_carrier(bond);
if (!rv)
return;
if (netif_carrier_ok(bond->dev)) {
pr_info("%s: first active interface up!\n",
bond->dev->name);
} else {
pr_info("%s: now running without any active interface!\n",
bond->dev->name);
}
}
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static inline int slave_enable_netpoll(struct slave *slave)
{
struct netpoll *np;
int err = 0;
np = kzalloc(sizeof(*np), GFP_KERNEL);
err = -ENOMEM;
if (!np)
goto out;
err = __netpoll_setup(np, slave->dev);
if (err) {
kfree(np);
goto out;
}
slave->np = np;
out:
return err;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
struct netpoll *np = slave->np;
if (!np)
return;
slave->np = NULL;
__netpoll_free_async(np);
}
static void bond_poll_controller(struct net_device *bond_dev)
{
}
static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter)
if (IS_UP(slave->dev))
slave_disable_netpoll(slave);
}
static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
{
struct bonding *bond = netdev_priv(dev);
struct list_head *iter;
struct slave *slave;
int err = 0;
bond_for_each_slave(bond, slave, iter) {
err = slave_enable_netpoll(slave);
if (err) {
bond_netpoll_cleanup(dev);
break;
}
}
return err;
}
#else
static inline int slave_enable_netpoll(struct slave *slave)
{
return 0;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
}
static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
}
#endif
/*---------------------------------- IOCTL ----------------------------------*/
static netdev_features_t bond_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct bonding *bond = netdev_priv(dev);
struct list_head *iter;
netdev_features_t mask;
struct slave *slave;
if (!bond_has_slaves(bond)) {
/* Disable adding VLANs to empty bond. But why? --mq */
features |= NETIF_F_VLAN_CHALLENGED;
return features;
}
mask = features;
features &= ~NETIF_F_ONE_FOR_ALL;
features |= NETIF_F_ALL_FOR_ALL;
bond_for_each_slave(bond, slave, iter) {
features = netdev_increment_features(features,
slave->dev->features,
mask);
}
features = netdev_add_tso_features(features, mask);
return features;
}
#define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
NETIF_F_HIGHDMA | NETIF_F_LRO)
static void bond_compute_features(struct bonding *bond)
{
unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
netdev_features_t vlan_features = BOND_VLAN_FEATURES;
struct net_device *bond_dev = bond->dev;
struct list_head *iter;
struct slave *slave;
unsigned short max_hard_header_len = ETH_HLEN;
unsigned int gso_max_size = GSO_MAX_SIZE;
u16 gso_max_segs = GSO_MAX_SEGS;
if (!bond_has_slaves(bond))
goto done;
bond_for_each_slave(bond, slave, iter) {
vlan_features = netdev_increment_features(vlan_features,
slave->dev->vlan_features, BOND_VLAN_FEATURES);
dst_release_flag &= slave->dev->priv_flags;
if (slave->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = slave->dev->hard_header_len;
gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
}
done:
bond_dev->vlan_features = vlan_features;
bond_dev->hard_header_len = max_hard_header_len;
bond_dev->gso_max_segs = gso_max_segs;
netif_set_gso_max_size(bond_dev, gso_max_size);
flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
bond_dev->priv_flags = flags | dst_release_flag;
netdev_change_features(bond_dev);
}
static void bond_setup_by_slave(struct net_device *bond_dev,
struct net_device *slave_dev)
{
bond_dev->header_ops = slave_dev->header_ops;
bond_dev->type = slave_dev->type;
bond_dev->hard_header_len = slave_dev->hard_header_len;
bond_dev->addr_len = slave_dev->addr_len;
memcpy(bond_dev->broadcast, slave_dev->broadcast,
slave_dev->addr_len);
}
/* On bonding slaves other than the currently active slave, suppress
* duplicates except for alb non-mcast/bcast.
*/
static bool bond_should_deliver_exact_match(struct sk_buff *skb,
struct slave *slave,
struct bonding *bond)
{
if (bond_is_slave_inactive(slave)) {
if (bond->params.mode == BOND_MODE_ALB &&
skb->pkt_type != PACKET_BROADCAST &&
skb->pkt_type != PACKET_MULTICAST)
return false;
return true;
}
return false;
}
static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct slave *slave;
struct bonding *bond;
int (*recv_probe)(const struct sk_buff *, struct bonding *,
struct slave *);
int ret = RX_HANDLER_ANOTHER;
skb = skb_share_check(skb, GFP_ATOMIC);
if (unlikely(!skb))
return RX_HANDLER_CONSUMED;
*pskb = skb;
slave = bond_slave_get_rcu(skb->dev);
bond = slave->bond;
recv_probe = ACCESS_ONCE(bond->recv_probe);
if (recv_probe) {
ret = recv_probe(skb, bond, slave);
if (ret == RX_HANDLER_CONSUMED) {
consume_skb(skb);
return ret;
}
}
if (bond_should_deliver_exact_match(skb, slave, bond)) {
return RX_HANDLER_EXACT;
}
skb->dev = bond->dev;
if (bond->params.mode == BOND_MODE_ALB &&
bond->dev->priv_flags & IFF_BRIDGE_PORT &&
skb->pkt_type == PACKET_HOST) {
if (unlikely(skb_cow_head(skb,
skb->data - skb_mac_header(skb)))) {
kfree_skb(skb);
return RX_HANDLER_CONSUMED;
}
ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
}
return ret;
}
static int bond_master_upper_dev_link(struct net_device *bond_dev,
struct net_device *slave_dev,
struct slave *slave)
{
int err;
err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
if (err)
return err;
slave_dev->flags |= IFF_SLAVE;
rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
return 0;
}
static void bond_upper_dev_unlink(struct net_device *bond_dev,
struct net_device *slave_dev)
{
netdev_upper_dev_unlink(slave_dev, bond_dev);
slave_dev->flags &= ~IFF_SLAVE;
rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
}
/* enslave device <slave> to bond device <master> */
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
struct slave *new_slave = NULL, *prev_slave;
struct sockaddr addr;
int link_reporting;
int res = 0, i;
if (!bond->params.use_carrier &&
slave_dev->ethtool_ops->get_link == NULL &&
slave_ops->ndo_do_ioctl == NULL) {
pr_warn("%s: Warning: no link monitoring support for %s\n",
bond_dev->name, slave_dev->name);
}
/* already enslaved */
if (slave_dev->flags & IFF_SLAVE) {
pr_debug("Error: Device was already enslaved\n");
return -EBUSY;
}
if (bond_dev == slave_dev) {
pr_err("%s: cannot enslave bond to itself.\n", bond_dev->name);
return -EPERM;
}
/* vlan challenged mutual exclusion */
/* no need to lock since we're protected by rtnl_lock */
if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
if (vlan_uses_dev(bond_dev)) {
pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
bond_dev->name, slave_dev->name, bond_dev->name);
return -EPERM;
} else {
pr_warn("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
bond_dev->name, slave_dev->name,
slave_dev->name, bond_dev->name);
}
} else {
pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
}
/*
* Old ifenslave binaries are no longer supported. These can
* be identified with moderate accuracy by the state of the slave:
* the current ifenslave will set the interface down prior to
* enslaving it; the old ifenslave will not.
*/
if ((slave_dev->flags & IFF_UP)) {
pr_err("%s is up - this may be due to an out of date ifenslave\n",
slave_dev->name);
res = -EPERM;
goto err_undo_flags;
}
/* set bonding device ether type by slave - bonding netdevices are
* created with ether_setup, so when the slave type is not ARPHRD_ETHER
* there is a need to override some of the type dependent attribs/funcs.
*
* bond ether type mutual exclusion - don't allow slaves of dissimilar
* ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
*/
if (!bond_has_slaves(bond)) {
if (bond_dev->type != slave_dev->type) {
pr_debug("%s: change device type from %d to %d\n",
bond_dev->name,
bond_dev->type, slave_dev->type);
res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
bond_dev);
res = notifier_to_errno(res);
if (res) {
pr_err("%s: refused to change device type\n",
bond_dev->name);
res = -EBUSY;
goto err_undo_flags;
}
/* Flush unicast and multicast addresses */
dev_uc_flush(bond_dev);
dev_mc_flush(bond_dev);
if (slave_dev->type != ARPHRD_ETHER)
bond_setup_by_slave(bond_dev, slave_dev);
else {
ether_setup(bond_dev);
bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
}
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
bond_dev);
}
} else if (bond_dev->type != slave_dev->type) {
pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
slave_dev->name, slave_dev->type, bond_dev->type);
res = -EINVAL;
goto err_undo_flags;
}
if (slave_ops->ndo_set_mac_address == NULL) {
if (!bond_has_slaves(bond)) {
pr_warn("%s: Warning: The first slave device specified does not support setting the MAC address\n",
bond_dev->name);
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
bond->params.fail_over_mac = BOND_FOM_ACTIVE;
pr_warn("%s: Setting fail_over_mac to active for active-backup mode\n",
bond_dev->name);
}
} else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n",
bond_dev->name);
res = -EOPNOTSUPP;
goto err_undo_flags;
}
}
call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
/* If this is the first slave, then we need to set the master's hardware
* address to be the same as the slave's. */
if (!bond_has_slaves(bond) &&
bond->dev->addr_assign_type == NET_ADDR_RANDOM)
bond_set_dev_addr(bond->dev, slave_dev);
new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
if (!new_slave) {
res = -ENOMEM;
goto err_undo_flags;
}
/*
* Set the new_slave's queue_id to be zero. Queue ID mapping
* is set via sysfs or module option if desired.
*/
new_slave->queue_id = 0;
/* Save slave's original mtu and then set it to match the bond */
new_slave->original_mtu = slave_dev->mtu;
res = dev_set_mtu(slave_dev, bond->dev->mtu);
if (res) {
pr_debug("Error %d calling dev_set_mtu\n", res);
goto err_free;
}
/*
* Save slave's original ("permanent") mac address for modes
* that need it, and for restoring it upon release, and then
* set it to the master's address
*/
ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
if (!bond->params.fail_over_mac ||
bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/*
* Set slave to master's mac address. The application already
* set the master's mac address to that of the first slave
*/
memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
addr.sa_family = slave_dev->type;
res = dev_set_mac_address(slave_dev, &addr);
if (res) {
pr_debug("Error %d calling set_mac_address\n", res);
goto err_restore_mtu;
}
}
/* open the slave since the application closed it */
res = dev_open(slave_dev);
if (res) {
pr_debug("Opening slave %s failed\n", slave_dev->name);
goto err_restore_mac;
}
new_slave->bond = bond;
new_slave->dev = slave_dev;
slave_dev->priv_flags |= IFF_BONDING;
if (bond_is_lb(bond)) {
/* bond_alb_init_slave() must be called before all other stages since
* it might fail and we do not want to have to undo everything
*/
res = bond_alb_init_slave(bond, new_slave);
if (res)
goto err_close;
}
/* If the mode USES_PRIMARY, then the following is handled by
* bond_change_active_slave().
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* set promiscuity level to new slave */
if (bond_dev->flags & IFF_PROMISC) {
res = dev_set_promiscuity(slave_dev, 1);
if (res)
goto err_close;
}
/* set allmulti level to new slave */
if (bond_dev->flags & IFF_ALLMULTI) {
res = dev_set_allmulti(slave_dev, 1);
if (res)
goto err_close;
}
netif_addr_lock_bh(bond_dev);
dev_mc_sync_multiple(slave_dev, bond_dev);
dev_uc_sync_multiple(slave_dev, bond_dev);
netif_addr_unlock_bh(bond_dev);
}
if (bond->params.mode == BOND_MODE_8023AD) {
/* add lacpdu mc addr to mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_add(slave_dev, lacpdu_multicast);
}
res = vlan_vids_add_by_dev(slave_dev, bond_dev);
if (res) {
pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
bond_dev->name, slave_dev->name);
goto err_close;
}
prev_slave = bond_last_slave(bond);
new_slave->delay = 0;
new_slave->link_failure_count = 0;
bond_update_speed_duplex(new_slave);
new_slave->last_rx = jiffies -
(msecs_to_jiffies(bond->params.arp_interval) + 1);
for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
new_slave->target_last_arp_rx[i] = new_slave->last_rx;
if (bond->params.miimon && !bond->params.use_carrier) {
link_reporting = bond_check_dev_link(bond, slave_dev, 1);
if ((link_reporting == -1) && !bond->params.arp_interval) {
/*
* miimon is set but a bonded network driver
* does not support ETHTOOL/MII and
* arp_interval is not set. Note: if
* use_carrier is enabled, we will never go
* here (because netif_carrier is always
* supported); thus, we don't need to change
* the messages for netif_carrier.
*/
pr_warn("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
bond_dev->name, slave_dev->name);
} else if (link_reporting == -1) {
/* unable get link status using mii/ethtool */
pr_warn("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n",
bond_dev->name, slave_dev->name);
}
}
/* check for initial state */
if (bond->params.miimon) {
if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
if (bond->params.updelay) {
new_slave->link = BOND_LINK_BACK;
new_slave->delay = bond->params.updelay;
} else {
new_slave->link = BOND_LINK_UP;
}
} else {
new_slave->link = BOND_LINK_DOWN;
}
} else if (bond->params.arp_interval) {
new_slave->link = (netif_carrier_ok(slave_dev) ?
BOND_LINK_UP : BOND_LINK_DOWN);
} else {
new_slave->link = BOND_LINK_UP;
}
if (new_slave->link != BOND_LINK_DOWN)
new_slave->last_link_up = jiffies;
pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
new_slave->link == BOND_LINK_DOWN ? "DOWN" :
(new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
/* if there is a primary slave, remember it */
if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
bond->primary_slave = new_slave;
bond->force_primary = true;
}
}
switch (bond->params.mode) {
case BOND_MODE_ACTIVEBACKUP:
bond_set_slave_inactive_flags(new_slave,
BOND_SLAVE_NOTIFY_NOW);
break;
case BOND_MODE_8023AD:
/* in 802.3ad mode, the internal mechanism
* will activate the slaves in the selected
* aggregator
*/
bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
/* if this is the first slave */
if (!prev_slave) {
SLAVE_AD_INFO(new_slave).id = 1;
/* Initialize AD with the number of times that the AD timer is called in 1 second
* can be called only after the mac address of the bond is set
*/
bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
} else {
SLAVE_AD_INFO(new_slave).id =
SLAVE_AD_INFO(prev_slave).id + 1;
}
bond_3ad_bind_slave(new_slave);
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
bond_set_active_slave(new_slave);
bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
break;
default:
pr_debug("This slave is always active in trunk mode\n");
/* always active in trunk mode */
bond_set_active_slave(new_slave);
/* In trunking mode there is little meaning to curr_active_slave
* anyway (it holds no special properties of the bond device),
* so we can change it without calling change_active_interface()
*/
if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
rcu_assign_pointer(bond->curr_active_slave, new_slave);
break;
} /* switch(bond_mode) */
#ifdef CONFIG_NET_POLL_CONTROLLER
slave_dev->npinfo = bond->dev->npinfo;
if (slave_dev->npinfo) {
if (slave_enable_netpoll(new_slave)) {
pr_info("Error, %s: master_dev is using netpoll, but new slave device does not support netpoll\n",
bond_dev->name);
res = -EBUSY;
goto err_detach;
}
}
#endif
res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
new_slave);
if (res) {
pr_debug("Error %d calling netdev_rx_handler_register\n", res);
goto err_detach;
}
res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
if (res) {
pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
goto err_unregister;
}
res = bond_sysfs_slave_add(new_slave);
if (res) {
pr_debug("Error %d calling bond_sysfs_slave_add\n", res);
goto err_upper_unlink;
}
bond->slave_cnt++;
bond_compute_features(bond);
bond_set_carrier(bond);
if (USES_PRIMARY(bond->params.mode)) {
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
pr_info("%s: Enslaving %s as %s interface with %s link\n",
bond_dev->name, slave_dev->name,
bond_is_active_slave(new_slave) ? "an active" : "a backup",
new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
/* enslave is successful */
return 0;
/* Undo stages on error */
err_upper_unlink:
bond_upper_dev_unlink(bond_dev, slave_dev);
err_unregister:
netdev_rx_handler_unregister(slave_dev);
err_detach:
if (!USES_PRIMARY(bond->params.mode))
bond_hw_addr_flush(bond_dev, slave_dev);
vlan_vids_del_by_dev(slave_dev, bond_dev);
if (bond->primary_slave == new_slave)
bond->primary_slave = NULL;
if (bond->curr_active_slave == new_slave) {
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_change_active_slave(bond, NULL);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
slave_disable_netpoll(new_slave);
err_close:
slave_dev->priv_flags &= ~IFF_BONDING;
dev_close(slave_dev);
err_restore_mac:
if (!bond->params.fail_over_mac ||
bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/* XXX TODO - fom follow mode needs to change master's
* MAC if this slave's MAC is in use by the bond, or at
* least print a warning.
*/
ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
}
err_restore_mtu:
dev_set_mtu(slave_dev, new_slave->original_mtu);
err_free:
kfree(new_slave);
err_undo_flags:
/* Enslave of first slave has failed and we need to fix master's mac */
if (!bond_has_slaves(bond) &&
ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
eth_hw_addr_random(bond_dev);
return res;
}
/*
* Try to release the slave device <slave> from the bond device <master>
* It is legal to access curr_active_slave without a lock because all the function
* is write-locked. If "all" is true it means that the function is being called
* while destroying a bond interface and all slaves are being released.
*
* The rules for slave state should be:
* for Active/Backup:
* Active stays on all backups go down
* for Bonded connections:
* The first up interface should be left on and all others downed.
*/
static int __bond_release_one(struct net_device *bond_dev,
struct net_device *slave_dev,
bool all)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *oldcurrent;
struct sockaddr addr;
int old_flags = bond_dev->flags;
netdev_features_t old_features = bond_dev->features;
/* slave is not a slave or master is not master of this slave */
if (!(slave_dev->flags & IFF_SLAVE) ||
!netdev_has_upper_dev(slave_dev, bond_dev)) {
pr_err("%s: Error: cannot release %s\n",
bond_dev->name, slave_dev->name);
return -EINVAL;
}
block_netpoll_tx();
slave = bond_get_slave_by_dev(bond, slave_dev);
if (!slave) {
/* not a slave of this bond */
pr_info("%s: %s not enslaved\n",
bond_dev->name, slave_dev->name);
unblock_netpoll_tx();
return -EINVAL;
}
bond_sysfs_slave_del(slave);
bond_upper_dev_unlink(bond_dev, slave_dev);
/* unregister rx_handler early so bond_handle_frame wouldn't be called
* for this slave anymore.
*/
netdev_rx_handler_unregister(slave_dev);
write_lock_bh(&bond->lock);
/* Inform AD package of unbinding of slave. */
if (bond->params.mode == BOND_MODE_8023AD)
bond_3ad_unbind_slave(slave);
write_unlock_bh(&bond->lock);
pr_info("%s: Releasing %s interface %s\n",
bond_dev->name,
bond_is_active_slave(slave) ? "active" : "backup",
slave_dev->name);
oldcurrent = bond->curr_active_slave;
bond->current_arp_slave = NULL;
if (!all && (!bond->params.fail_over_mac ||
bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
bond_has_slaves(bond))
pr_warn("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
bond_dev->name, slave_dev->name,
slave->perm_hwaddr,
bond_dev->name, slave_dev->name);
}
if (bond->primary_slave == slave)
bond->primary_slave = NULL;
if (oldcurrent == slave) {
write_lock_bh(&bond->curr_slave_lock);
bond_change_active_slave(bond, NULL);
write_unlock_bh(&bond->curr_slave_lock);
}
if (bond_is_lb(bond)) {
/* Must be called only after the slave has been
* detached from the list and the curr_active_slave
* has been cleared (if our_slave == old_current),
* but before a new active slave is selected.
*/
bond_alb_deinit_slave(bond, slave);
}
if (all) {
RCU_INIT_POINTER(bond->curr_active_slave, NULL);
} else if (oldcurrent == slave) {
/*
* Note that we hold RTNL over this sequence, so there
* is no concern that another slave add/remove event
* will interfere.
*/
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
}
if (!bond_has_slaves(bond)) {
bond_set_carrier(bond);
eth_hw_addr_random(bond_dev);
if (vlan_uses_dev(bond_dev)) {
pr_warn("%s: Warning: clearing HW address of %s while it still has VLANs\n",
bond_dev->name, bond_dev->name);
pr_warn("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs\n",
bond_dev->name);
}
}
unblock_netpoll_tx();
synchronize_rcu();
bond->slave_cnt--;
if (!bond_has_slaves(bond)) {
call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
}
bond_compute_features(bond);
if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
(old_features & NETIF_F_VLAN_CHALLENGED))
pr_info("%s: last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
bond_dev->name, slave_dev->name, bond_dev->name);
/* must do this from outside any spinlocks */
vlan_vids_del_by_dev(slave_dev, bond_dev);
/* If the mode USES_PRIMARY, then this cases was handled above by
* bond_change_active_slave(..., NULL)
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* unset promiscuity level from slave
* NOTE: The NETDEV_CHANGEADDR call above may change the value
* of the IFF_PROMISC flag in the bond_dev, but we need the
* value of that flag before that change, as that was the value
* when this slave was attached, so we cache at the start of the
* function and use it here. Same goes for ALLMULTI below
*/
if (old_flags & IFF_PROMISC)
dev_set_promiscuity(slave_dev, -1);
/* unset allmulti level from slave */
if (old_flags & IFF_ALLMULTI)
dev_set_allmulti(slave_dev, -1);
bond_hw_addr_flush(bond_dev, slave_dev);
}
slave_disable_netpoll(slave);
/* close slave before restoring its mac address */
dev_close(slave_dev);
if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/* restore original ("permanent") mac address */
ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
}
dev_set_mtu(slave_dev, slave->original_mtu);
slave_dev->priv_flags &= ~IFF_BONDING;
kfree(slave);
return 0; /* deletion OK */
}
/* A wrapper used because of ndo_del_link */
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
{
return __bond_release_one(bond_dev, slave_dev, false);
}
/*
* First release a slave and then destroy the bond if no more slaves are left.
* Must be under rtnl_lock when this function is called.
*/
static int bond_release_and_destroy(struct net_device *bond_dev,
struct net_device *slave_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
int ret;
ret = bond_release(bond_dev, slave_dev);
if (ret == 0 && !bond_has_slaves(bond)) {
bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
pr_info("%s: Destroying bond %s\n",
bond_dev->name, bond_dev->name);
unregister_netdevice(bond_dev);
}
return ret;
}
static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
{
struct bonding *bond = netdev_priv(bond_dev);
info->bond_mode = bond->params.mode;
info->miimon = bond->params.miimon;
info->num_slaves = bond->slave_cnt;
return 0;
}
static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
int i = 0, res = -ENODEV;
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
if (i++ == (int)info->slave_id) {
res = 0;
strcpy(info->slave_name, slave->dev->name);
info->link = slave->link;
info->state = bond_slave_state(slave);
info->link_failure_count = slave->link_failure_count;
break;
}
}
return res;
}
/*-------------------------------- Monitoring -------------------------------*/
static int bond_miimon_inspect(struct bonding *bond)
{
int link_state, commit = 0;
struct list_head *iter;
struct slave *slave;
bool ignore_updelay;
ignore_updelay = !bond->curr_active_slave ? true : false;
bond_for_each_slave_rcu(bond, slave, iter) {
slave->new_link = BOND_LINK_NOCHANGE;
link_state = bond_check_dev_link(bond, slave->dev, 0);
switch (slave->link) {
case BOND_LINK_UP:
if (link_state)
continue;
slave->link = BOND_LINK_FAIL;
slave->delay = bond->params.downdelay;
if (slave->delay) {
pr_info("%s: link status down for %sinterface %s, disabling it in %d ms\n",
bond->dev->name,
(bond->params.mode ==
BOND_MODE_ACTIVEBACKUP) ?
(bond_is_active_slave(slave) ?
"active " : "backup ") : "",
slave->dev->name,
bond->params.downdelay * bond->params.miimon);
}
/*FALLTHRU*/
case BOND_LINK_FAIL:
if (link_state) {
/*
* recovered before downdelay expired
*/
slave->link = BOND_LINK_UP;
slave->last_link_up = jiffies;
pr_info("%s: link status up again after %d ms for interface %s\n",
bond->dev->name,
(bond->params.downdelay - slave->delay) *
bond->params.miimon,
slave->dev->name);
continue;
}
if (slave->delay <= 0) {
slave->new_link = BOND_LINK_DOWN;
commit++;
continue;
}
slave->delay--;
break;
case BOND_LINK_DOWN:
if (!link_state)
continue;
slave->link = BOND_LINK_BACK;
slave->delay = bond->params.updelay;
if (slave->delay) {
pr_info("%s: link status up for interface %s, enabling it in %d ms\n",
bond->dev->name, slave->dev->name,
ignore_updelay ? 0 :
bond->params.updelay *
bond->params.miimon);
}
/*FALLTHRU*/
case BOND_LINK_BACK:
if (!link_state) {
slave->link = BOND_LINK_DOWN;
pr_info("%s: link status down again after %d ms for interface %s\n",
bond->dev->name,
(bond->params.updelay - slave->delay) *
bond->params.miimon,
slave->dev->name);
continue;
}
if (ignore_updelay)
slave->delay = 0;
if (slave->delay <= 0) {
slave->new_link = BOND_LINK_UP;
commit++;
ignore_updelay = false;
continue;
}
slave->delay--;
break;
}
}
return commit;
}
static void bond_miimon_commit(struct bonding *bond)
{
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
switch (slave->new_link) {
case BOND_LINK_NOCHANGE:
continue;
case BOND_LINK_UP:
slave->link = BOND_LINK_UP;
slave->last_link_up = jiffies;
if (bond->params.mode == BOND_MODE_8023AD) {
/* prevent it from being the active one */
bond_set_backup_slave(slave);
} else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/* make it immediately active */
bond_set_active_slave(slave);
} else if (slave != bond->primary_slave) {
/* prevent it from being the active one */
bond_set_backup_slave(slave);
}
pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex\n",
bond->dev->name, slave->dev->name,
slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
slave->duplex ? "full" : "half");
/* notify ad that the link status has changed */
if (bond->params.mode == BOND_MODE_8023AD)
bond_3ad_handle_link_change(slave, BOND_LINK_UP);
if (bond_is_lb(bond))
bond_alb_handle_link_change(bond, slave,
BOND_LINK_UP);
if (!bond->curr_active_slave ||
(slave == bond->primary_slave))
goto do_failover;
continue;
case BOND_LINK_DOWN:
if (slave->link_failure_count < UINT_MAX)
slave->link_failure_count++;
slave->link = BOND_LINK_DOWN;
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
bond->params.mode == BOND_MODE_8023AD)
bond_set_slave_inactive_flags(slave,
BOND_SLAVE_NOTIFY_NOW);
pr_info("%s: link status definitely down for interface %s, disabling it\n",
bond->dev->name, slave->dev->name);
if (bond->params.mode == BOND_MODE_8023AD)
bond_3ad_handle_link_change(slave,
BOND_LINK_DOWN);
if (bond_is_lb(bond))
bond_alb_handle_link_change(bond, slave,
BOND_LINK_DOWN);
if (slave == bond->curr_active_slave)
goto do_failover;
continue;
default:
pr_err("%s: invalid new link %d on slave %s\n",
bond->dev->name, slave->new_link,
slave->dev->name);
slave->new_link = BOND_LINK_NOCHANGE;
continue;
}
do_failover:
ASSERT_RTNL();
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
bond_set_carrier(bond);
}
/*
* bond_mii_monitor
*
* Really a wrapper that splits the mii monitor into two phases: an
* inspection, then (if inspection indicates something needs to be done)
* an acquisition of appropriate locks followed by a commit phase to
* implement whatever link state changes are indicated.
*/
static void bond_mii_monitor(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
mii_work.work);
bool should_notify_peers = false;
unsigned long delay;
delay = msecs_to_jiffies(bond->params.miimon);
if (!bond_has_slaves(bond))
goto re_arm;
rcu_read_lock();
should_notify_peers = bond_should_notify_peers(bond);
if (bond_miimon_inspect(bond)) {
rcu_read_unlock();
/* Race avoidance with bond_close cancel of workqueue */
if (!rtnl_trylock()) {
delay = 1;
should_notify_peers = false;
goto re_arm;
}
bond_miimon_commit(bond);
rtnl_unlock(); /* might sleep, hold no other locks */
} else
rcu_read_unlock();
re_arm:
if (bond->params.miimon)
queue_delayed_work(bond->wq, &bond->mii_work, delay);
if (should_notify_peers) {
if (!rtnl_trylock())
return;
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
rtnl_unlock();
}
}
static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
{
struct net_device *upper;
struct list_head *iter;
bool ret = false;
if (ip == bond_confirm_addr(bond->dev, 0, ip))
return true;
rcu_read_lock();
netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
if (ip == bond_confirm_addr(upper, 0, ip)) {
ret = true;
break;
}
}
rcu_read_unlock();
return ret;
}
/*
* We go to the (large) trouble of VLAN tagging ARP frames because
* switches in VLAN mode (especially if ports are configured as
* "native" to a VLAN) might not pass non-tagged frames.
*/
static void bond_arp_send(struct net_device *slave_dev, int arp_op,
__be32 dest_ip, __be32 src_ip,
struct bond_vlan_tag *inner,
struct bond_vlan_tag *outer)
{
struct sk_buff *skb;
pr_debug("arp %d on slave %s: dst %pI4 src %pI4\n",
arp_op, slave_dev->name, &dest_ip, &src_ip);
skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
NULL, slave_dev->dev_addr, NULL);
if (!skb) {
net_err_ratelimited("ARP packet allocation failed\n");
return;
}
if (outer->vlan_id) {
if (inner->vlan_id) {
pr_debug("inner tag: proto %X vid %X\n",
ntohs(inner->vlan_proto), inner->vlan_id);
skb = __vlan_put_tag(skb, inner->vlan_proto,
inner->vlan_id);
if (!skb) {
net_err_ratelimited("failed to insert inner VLAN tag\n");
return;
}
}
pr_debug("outer reg: proto %X vid %X\n",
ntohs(outer->vlan_proto), outer->vlan_id);
skb = vlan_put_tag(skb, outer->vlan_proto, outer->vlan_id);
if (!skb) {
net_err_ratelimited("failed to insert outer VLAN tag\n");
return;
}
}
arp_xmit(skb);
}
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
struct net_device *upper, *vlan_upper;
struct list_head *iter, *vlan_iter;
struct rtable *rt;
struct bond_vlan_tag inner, outer;
__be32 *targets = bond->params.arp_targets, addr;
int i;
for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
pr_debug("basa: target %pI4\n", &targets[i]);
inner.vlan_proto = 0;
inner.vlan_id = 0;
outer.vlan_proto = 0;
outer.vlan_id = 0;
/* 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)) {
/* there's no route to target - try to send arp
* probe to generate any traffic (arp_validate=0)
*/
if (bond->params.arp_validate)
net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
bond->dev->name,
&targets[i]);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 0, &inner, &outer);
continue;
}
/* 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.
*/
netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
vlan_iter) {
if (!is_vlan_dev(vlan_upper))
continue;
if (vlan_upper == rt->dst.dev) {
outer.vlan_proto = vlan_dev_vlan_proto(vlan_upper);
outer.vlan_id = vlan_dev_vlan_id(vlan_upper);
rcu_read_unlock();
goto found;
}
netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
iter) {
if (upper == rt->dst.dev) {
/* If the upper dev is a vlan dev too,
* set the vlan tag to inner tag.
*/
if (is_vlan_dev(upper)) {
inner.vlan_proto = vlan_dev_vlan_proto(upper);
inner.vlan_id = vlan_dev_vlan_id(upper);
}
outer.vlan_proto = vlan_dev_vlan_proto(vlan_upper);
outer.vlan_id = vlan_dev_vlan_id(vlan_upper);
rcu_read_unlock();
goto found;
}
}
}
/* 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_all_upper_dev_rcu(bond->dev, upper, iter) {
if (upper == rt->dst.dev) {
rcu_read_unlock();
goto found;
}
}
rcu_read_unlock();
/* Not our device - skip */
pr_debug("%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, &inner, &outer);
}
}
static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
{
int i;
if (!sip || !bond_has_this_ip(bond, tip)) {
pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
return;
}
i = bond_get_targets_ip(bond->params.arp_targets, sip);
if (i == -1) {
pr_debug("bva: sip %pI4 not found in targets\n", &sip);
return;
}
slave->last_rx = jiffies;
slave->target_last_arp_rx[i] = jiffies;
}
int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
struct arphdr *arp = (struct arphdr *)skb->data;
struct slave *curr_active_slave;
unsigned char *arp_ptr;
__be32 sip, tip;
int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
if (!slave_do_arp_validate(bond, slave)) {
if ((slave_do_arp_validate_only(bond, slave) && is_arp) ||
!slave_do_arp_validate_only(bond, slave))
slave->last_rx = jiffies;
return RX_HANDLER_ANOTHER;
} else if (!is_arp) {
return RX_HANDLER_ANOTHER;
}
alen = arp_hdr_len(bond->dev);
pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
bond->dev->name, skb->dev->name);
if (alen > skb_headlen(skb)) {
arp = kmalloc(alen, GFP_ATOMIC);
if (!arp)
goto out_unlock;
if (skb_copy_bits(skb, 0, arp, alen) < 0)
goto out_unlock;
}
if (arp->ar_hln != bond->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 += bond->dev->addr_len;
memcpy(&sip, arp_ptr, 4);
arp_ptr += 4 + bond->dev->addr_len;
memcpy(&tip, arp_ptr, 4);
pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
bond->dev->name, slave->dev->name, bond_slave_state(slave),
bond->params.arp_validate, slave_do_arp_validate(bond, slave),
&sip, &tip);
curr_active_slave = rcu_dereference(bond->curr_active_slave);
/*
* 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.
*
* We 'trust' the arp requests if there is an active slave and
* it received valid arp reply(s) after it became active. This
* is done to avoid endless looping when we can't reach the
* arp_ip_target and fool ourselves with our own arp requests.
*/
if (bond_is_active_slave(slave))
bond_validate_arp(bond, slave, sip, tip);
else if (curr_active_slave &&
time_after(slave_last_rx(bond, curr_active_slave),
curr_active_slave->last_link_up))
bond_validate_arp(bond, slave, tip, sip);
out_unlock:
if (arp != (struct arphdr *)skb->data)
kfree(arp);
return RX_HANDLER_ANOTHER;
}
/* function to verify if we're in the arp_interval timeslice, returns true if
* (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
* arp_interval/2) . the arp_interval/2 is needed for really fast networks.
*/
static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
int mod)
{
int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
return time_in_range(jiffies,
last_act - delta_in_ticks,
last_act + mod * delta_in_ticks + delta_in_ticks/2);
}
/*
* this function is called regularly to monitor each slave's link
* ensuring that traffic is being sent and received when arp monitoring
* is used in load-balancing mode. if the adapter has been dormant, then an
* arp is transmitted to generate traffic. see activebackup_arp_monitor for
* arp monitoring in active backup mode.
*/
static void bond_loadbalance_arp_mon(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
arp_work.work);
struct slave *slave, *oldcurrent;
struct list_head *iter;
int do_failover = 0, slave_state_changed = 0;
if (!bond_has_slaves(bond))
goto re_arm;
rcu_read_lock();
oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
/* see if any of the previous devices are up now (i.e. they have
* xmt and rcv traffic). the curr_active_slave does not come into
* the picture unless it is null. also, slave->last_link_up is not
* needed here because we send an arp on each slave and give a slave
* as long as it needs to get the tx/rx within the delta.
* TODO: what about up/down delay in arp mode? it wasn't here before
* so it can wait
*/
bond_for_each_slave_rcu(bond, slave, iter) {
unsigned long trans_start = dev_trans_start(slave->dev);
if (slave->link != BOND_LINK_UP) {
if (bond_time_in_interval(bond, trans_start, 1) &&
bond_time_in_interval(bond, slave->last_rx, 1)) {
slave->link = BOND_LINK_UP;
slave_state_changed = 1;
/* primary_slave has no meaning in round-robin
* mode. the window of a slave being up and
* curr_active_slave being null after enslaving
* is closed.
*/
if (!oldcurrent) {
pr_info("%s: link status definitely up for interface %s\n",
bond->dev->name,
slave->dev->name);
do_failover = 1;
} else {
pr_info("%s: interface %s is now up\n",
bond->dev->name,
slave->dev->name);
}
}
} else {
/* slave->link == BOND_LINK_UP */
/* not all switches will respond to an arp request
* when the source ip is 0, so don't take the link down
* if we don't know our ip yet
*/
if (!bond_time_in_interval(bond, trans_start, 2) ||
!bond_time_in_interval(bond, slave->last_rx, 2)) {
slave->link = BOND_LINK_DOWN;
slave_state_changed = 1;
if (slave->link_failure_count < UINT_MAX)
slave->link_failure_count++;
pr_info("%s: interface %s is now down\n",
bond->dev->name, slave->dev->name);
if (slave == oldcurrent)
do_failover = 1;
}
}
/* note: if switch is in round-robin mode, all links
* must tx arp to ensure all links rx an arp - otherwise
* links may oscillate or not come up at all; if switch is
* in something like xor mode, there is nothing we can
* do - all replies will be rx'ed on same link causing slaves
* to be unstable during low/no traffic periods
*/
if (IS_UP(slave->dev))
bond_arp_send_all(bond, slave);
}
rcu_read_unlock();
if (do_failover || slave_state_changed) {
if (!rtnl_trylock())
goto re_arm;
if (slave_state_changed) {
bond_slave_state_change(bond);
} else if (do_failover) {
/* the bond_select_active_slave must hold RTNL
* and curr_slave_lock for write.
*/
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
rtnl_unlock();
}
re_arm:
if (bond->params.arp_interval)
queue_delayed_work(bond->wq, &bond->arp_work,
msecs_to_jiffies(bond->params.arp_interval));
}
/*
* Called to inspect slaves for active-backup mode ARP monitor link state
* changes. Sets new_link in slaves to specify what action should take
* place for the slave. Returns 0 if no changes are found, >0 if changes
* to link states must be committed.
*
* Called with rcu_read_lock hold.
*/
static int bond_ab_arp_inspect(struct bonding *bond)
{
unsigned long trans_start, last_rx;
struct list_head *iter;
struct slave *slave;
int commit = 0;
bond_for_each_slave_rcu(bond, slave, iter) {
slave->new_link = BOND_LINK_NOCHANGE;
last_rx = slave_last_rx(bond, slave);
if (slave->link != BOND_LINK_UP) {
if (bond_time_in_interval(bond, last_rx, 1)) {
slave->new_link = BOND_LINK_UP;
commit++;
}
continue;
}
/*
* Give slaves 2*delta after being enslaved or made
* active. This avoids bouncing, as the last receive
* times need a full ARP monitor cycle to be updated.
*/
if (bond_time_in_interval(bond, slave->last_link_up, 2))
continue;
/*
* Backup slave is down if:
* - No current_arp_slave AND
* - more than 3*delta since last receive AND
* - the bond has an IP address
*
* Note: a non-null current_arp_slave indicates
* the curr_active_slave went down and we are
* searching for a new one; under this condition
* we only take the curr_active_slave down - this
* gives each slave a chance to tx/rx traffic
* before being taken out
*/
if (!bond_is_active_slave(slave) &&
!bond->current_arp_slave &&
!bond_time_in_interval(bond, last_rx, 3)) {
slave->new_link = BOND_LINK_DOWN;
commit++;
}
/*
* Active slave is down if:
* - more than 2*delta since transmitting OR
* - (more than 2*delta since receive AND
* the bond has an IP address)
*/
trans_start = dev_trans_start(slave->dev);
if (bond_is_active_slave(slave) &&
(!bond_time_in_interval(bond, trans_start, 2) ||
!bond_time_in_interval(bond, last_rx, 2))) {
slave->new_link = BOND_LINK_DOWN;
commit++;
}
}
return commit;
}
/*
* Called to commit link state changes noted by inspection step of
* active-backup mode ARP monitor.
*
* Called with RTNL hold.
*/
static void bond_ab_arp_commit(struct bonding *bond)
{
unsigned long trans_start;
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
switch (slave->new_link) {
case BOND_LINK_NOCHANGE:
continue;
case BOND_LINK_UP:
trans_start = dev_trans_start(slave->dev);
if (bond->curr_active_slave != slave ||
(!bond->curr_active_slave &&
bond_time_in_interval(bond, trans_start, 1))) {
slave->link = BOND_LINK_UP;
if (bond->current_arp_slave) {
bond_set_slave_inactive_flags(
bond->current_arp_slave,
BOND_SLAVE_NOTIFY_NOW);
bond->current_arp_slave = NULL;
}
pr_info("%s: link status definitely up for interface %s\n",
bond->dev->name, slave->dev->name);
if (!bond->curr_active_slave ||
(slave == bond->primary_slave))
goto do_failover;
}
continue;
case BOND_LINK_DOWN:
if (slave->link_failure_count < UINT_MAX)
slave->link_failure_count++;
slave->link = BOND_LINK_DOWN;
bond_set_slave_inactive_flags(slave,
BOND_SLAVE_NOTIFY_NOW);
pr_info("%s: link status definitely down for interface %s, disabling it\n",
bond->dev->name, slave->dev->name);
if (slave == bond->curr_active_slave) {
bond->current_arp_slave = NULL;
goto do_failover;
}
continue;
default:
pr_err("%s: impossible: new_link %d on slave %s\n",
bond->dev->name, slave->new_link,
slave->dev->name);
continue;
}
do_failover:
ASSERT_RTNL();
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
bond_set_carrier(bond);
}
/*
* Send ARP probes for active-backup mode ARP monitor.
*
* Called with rcu_read_lock hold.
*/
static bool bond_ab_arp_probe(struct bonding *bond)
{
struct slave *slave, *before = NULL, *new_slave = NULL,
*curr_arp_slave = rcu_dereference(bond->current_arp_slave),
*curr_active_slave = rcu_dereference(bond->curr_active_slave);
struct list_head *iter;
bool found = false;
bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
if (curr_arp_slave && curr_active_slave)
pr_info("PROBE: c_arp %s && cas %s BAD\n",
curr_arp_slave->dev->name,
curr_active_slave->dev->name);
if (curr_active_slave) {
bond_arp_send_all(bond, curr_active_slave);
return should_notify_rtnl;
}
/* if we don't have a curr_active_slave, search for the next available
* backup slave from the current_arp_slave and make it the candidate
* for becoming the curr_active_slave
*/
if (!curr_arp_slave) {
curr_arp_slave = bond_first_slave_rcu(bond);
if (!curr_arp_slave)
return should_notify_rtnl;
}
bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
bond_for_each_slave_rcu(bond, slave, iter) {
if (!found && !before && IS_UP(slave->dev))
before = slave;
if (found && !new_slave && IS_UP(slave->dev))
new_slave = slave;
/* if the link state is up at this point, we
* mark it down - this can happen if we have
* simultaneous link failures and
* reselect_active_interface doesn't make this
* one the current slave so it is still marked
* up when it is actually down
*/
if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
slave->link = BOND_LINK_DOWN;
if (slave->link_failure_count < UINT_MAX)
slave->link_failure_count++;
bond_set_slave_inactive_flags(slave,
BOND_SLAVE_NOTIFY_LATER);
pr_info("%s: backup interface %s is now down\n",
bond->dev->name, slave->dev->name);
}
if (slave == curr_arp_slave)
found = true;
}
if (!new_slave && before)
new_slave = before;
if (!new_slave)
goto check_state;
new_slave->link = BOND_LINK_BACK;
bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
bond_arp_send_all(bond, new_slave);
new_slave->last_link_up = jiffies;
rcu_assign_pointer(bond->current_arp_slave, new_slave);
check_state:
bond_for_each_slave_rcu(bond, slave, iter) {
if (slave->should_notify) {
should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
break;
}
}
return should_notify_rtnl;
}
static void bond_activebackup_arp_mon(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
arp_work.work);
bool should_notify_peers = false;
bool should_notify_rtnl = false;
int delta_in_ticks;
delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
if (!bond_has_slaves(bond))
goto re_arm;
rcu_read_lock();
should_notify_peers = bond_should_notify_peers(bond);
if (bond_ab_arp_inspect(bond)) {
rcu_read_unlock();
/* Race avoidance with bond_close flush of workqueue */
if (!rtnl_trylock()) {
delta_in_ticks = 1;
should_notify_peers = false;
goto re_arm;
}
bond_ab_arp_commit(bond);
rtnl_unlock();
rcu_read_lock();
}
should_notify_rtnl = bond_ab_arp_probe(bond);
rcu_read_unlock();
re_arm:
if (bond->params.arp_interval)
queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
if (should_notify_peers || should_notify_rtnl) {
if (!rtnl_trylock())
return;
if (should_notify_peers)
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
bond->dev);
if (should_notify_rtnl)
bond_slave_state_notify(bond);
rtnl_unlock();
}
}
/*-------------------------- netdev event handling --------------------------*/
/*
* Change device name
*/
static int bond_event_changename(struct bonding *bond)
{
bond_remove_proc_entry(bond);
bond_create_proc_entry(bond);
bond_debug_reregister(bond);
return NOTIFY_DONE;
}
static int bond_master_netdev_event(unsigned long event,
struct net_device *bond_dev)
{
struct bonding *event_bond = netdev_priv(bond_dev);
switch (event) {
case NETDEV_CHANGENAME:
return bond_event_changename(event_bond);
case NETDEV_UNREGISTER:
bond_remove_proc_entry(event_bond);
break;
case NETDEV_REGISTER:
bond_create_proc_entry(event_bond);
break;
case NETDEV_NOTIFY_PEERS:
if (event_bond->send_peer_notif)
event_bond->send_peer_notif--;
break;
default:
break;
}
return NOTIFY_DONE;
}
static int bond_slave_netdev_event(unsigned long event,
struct net_device *slave_dev)
{
struct slave *slave = bond_slave_get_rtnl(slave_dev);
struct bonding *bond;
struct net_device *bond_dev;
u32 old_speed;
u8 old_duplex;
/* A netdev event can be generated while enslaving a device
* before netdev_rx_handler_register is called in which case
* slave will be NULL
*/
if (!slave)
return NOTIFY_DONE;
bond_dev = slave->bond->dev;
bond = slave->bond;
switch (event) {
case NETDEV_UNREGISTER:
if (bond_dev->type != ARPHRD_ETHER)
bond_release_and_destroy(bond_dev, slave_dev);
else
bond_release(bond_dev, slave_dev);
break;
case NETDEV_UP:
case NETDEV_CHANGE:
old_speed = slave->speed;
old_duplex = slave->duplex;
bond_update_speed_duplex(slave);
if (bond->params.mode == BOND_MODE_8023AD) {
if (old_speed != slave->speed)
bond_3ad_adapter_speed_changed(slave);
if (old_duplex != slave->duplex)
bond_3ad_adapter_duplex_changed(slave);
}
break;
case NETDEV_DOWN:
/*
* ... Or is it this?
*/
break;
case NETDEV_CHANGEMTU:
/*
* TODO: Should slaves be allowed to
* independently alter their MTU? For
* an active-backup bond, slaves need
* not be the same type of device, so
* MTUs may vary. For other modes,
* slaves arguably should have the
* same MTUs. To do this, we'd need to
* take over the slave's change_mtu
* function for the duration of their
* servitude.
*/
break;
case NETDEV_CHANGENAME:
/* we don't care if we don't have primary set */
if (!USES_PRIMARY(bond->params.mode) ||
!bond->params.primary[0])
break;
if (slave == bond->primary_slave) {
/* slave's name changed - he's no longer primary */
bond->primary_slave = NULL;
} else if (!strcmp(slave_dev->name, bond->params.primary)) {
/* we have a new primary slave */
bond->primary_slave = slave;
} else { /* we didn't change primary - exit */
break;
}
pr_info("%s: Primary slave changed to %s, reselecting active slave\n",
bond->dev->name,
bond->primary_slave ? slave_dev->name : "none");
block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
break;
case NETDEV_FEAT_CHANGE:
bond_compute_features(bond);
break;
case NETDEV_RESEND_IGMP:
/* Propagate to master device */
call_netdevice_notifiers(event, slave->bond->dev);
break;
default:
break;
}
return NOTIFY_DONE;
}
/*
* bond_netdev_event: handle netdev notifier chain events.
*
* This function receives events for the netdev chain. The caller (an
* ioctl handler calling blocking_notifier_call_chain) holds the necessary
* locks for us to safely manipulate the slave devices (RTNL lock,
* dev_probe_lock).
*/
static int bond_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
pr_debug("event_dev: %s, event: %lx\n",
event_dev ? event_dev->name : "None", event);
if (!(event_dev->priv_flags & IFF_BONDING))
return NOTIFY_DONE;
if (event_dev->flags & IFF_MASTER) {
pr_debug("IFF_MASTER\n");
return bond_master_netdev_event(event, event_dev);
}
if (event_dev->flags & IFF_SLAVE) {
pr_debug("IFF_SLAVE\n");
return bond_slave_netdev_event(event, event_dev);
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier = {
.notifier_call = bond_netdev_event,
};
/*---------------------------- Hashing Policies -----------------------------*/
/* L2 hash helper */
static inline u32 bond_eth_hash(struct sk_buff *skb)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
return data->h_dest[5] ^ data->h_source[5];
return 0;
}
/* Extract the appropriate headers based on bond's xmit policy */
static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
struct flow_keys *fk)
{
const struct ipv6hdr *iph6;
const struct iphdr *iph;
int noff, proto = -1;
if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
return skb_flow_dissect(skb, fk);
fk->ports = 0;
noff = skb_network_offset(skb);
if (skb->protocol == htons(ETH_P_IP)) {
if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
return false;
iph = ip_hdr(skb);
fk->src = iph->saddr;
fk->dst = iph->daddr;
noff += iph->ihl << 2;
if (!ip_is_fragment(iph))
proto = iph->protocol;
} else if (skb->protocol == htons(ETH_P_IPV6)) {
if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
return false;
iph6 = ipv6_hdr(skb);
fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
noff += sizeof(*iph6);
proto = iph6->nexthdr;
} else {
return false;
}
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
fk->ports = skb_flow_get_ports(skb, noff, proto);
return true;
}
/**
* bond_xmit_hash - generate a hash value based on the xmit policy
* @bond: bonding device
* @skb: buffer to use for headers
* @count: modulo value
*
* This function will extract the necessary headers from the skb buffer and use
* them to generate a hash based on the xmit_policy set in the bonding device
* which will be reduced modulo count before returning.
*/
int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
{
struct flow_keys flow;
u32 hash;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
!bond_flow_dissect(bond, skb, &flow))
return bond_eth_hash(skb) % count;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
hash = bond_eth_hash(skb);
else
hash = (__force u32)flow.ports;
hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
hash ^= (hash >> 16);
hash ^= (hash >> 8);
return hash % count;
}
/*-------------------------- Device entry points ----------------------------*/
static void bond_work_init_all(struct bonding *bond)
{
INIT_DELAYED_WORK(&bond->mcast_work,
bond_resend_igmp_join_requests_delayed);
INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
else
INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
}
static void bond_work_cancel_all(struct bonding *bond)
{
cancel_delayed_work_sync(&bond->mii_work);
cancel_delayed_work_sync(&bond->arp_work);
cancel_delayed_work_sync(&bond->alb_work);
cancel_delayed_work_sync(&bond->ad_work);
cancel_delayed_work_sync(&bond->mcast_work);
}
static int bond_open(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
/* reset slave->backup and slave->inactive */
read_lock(&bond->lock);
if (bond_has_slaves(bond)) {
read_lock(&bond->curr_slave_lock);
bond_for_each_slave(bond, slave, iter) {
if (USES_PRIMARY(bond->params.mode)
&& (slave != bond->curr_active_slave)) {
bond_set_slave_inactive_flags(slave,
BOND_SLAVE_NOTIFY_NOW);
} else {
bond_set_slave_active_flags(slave,
BOND_SLAVE_NOTIFY_NOW);
}
}
read_unlock(&bond->curr_slave_lock);
}
read_unlock(&bond->lock);
bond_work_init_all(bond);
if (bond_is_lb(bond)) {
/* bond_alb_initialize must be called before the timer
* is started.
*/
if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
return -ENOMEM;
queue_delayed_work(bond->wq, &bond->alb_work, 0);
}
if (bond->params.miimon) /* link check interval, in milliseconds. */
queue_delayed_work(bond->wq, &bond->mii_work, 0);
if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
queue_delayed_work(bond->wq, &bond->arp_work, 0);
bond->recv_probe = bond_arp_rcv;
}
if (bond->params.mode == BOND_MODE_8023AD) {
queue_delayed_work(bond->wq, &bond->ad_work, 0);
/* register to receive LACPDUs */
bond->recv_probe = bond_3ad_lacpdu_recv;
bond_3ad_initiate_agg_selection(bond, 1);
}
return 0;
}
static int bond_close(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
bond_work_cancel_all(bond);
bond->send_peer_notif = 0;
if (bond_is_lb(bond))
bond_alb_deinitialize(bond);
bond->recv_probe = NULL;
return 0;
}
static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
struct rtnl_link_stats64 *stats)
{
struct bonding *bond = netdev_priv(bond_dev);
struct rtnl_link_stats64 temp;
struct list_head *iter;
struct slave *slave;
memset(stats, 0, sizeof(*stats));
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, iter) {
const struct rtnl_link_stats64 *sstats =
dev_get_stats(slave->dev, &temp);
stats->rx_packets += sstats->rx_packets;
stats->rx_bytes += sstats->rx_bytes;
stats->rx_errors += sstats->rx_errors;
stats->rx_dropped += sstats->rx_dropped;
stats->tx_packets += sstats->tx_packets;
stats->tx_bytes += sstats->tx_bytes;
stats->tx_errors += sstats->tx_errors;
stats->tx_dropped += sstats->tx_dropped;
stats->multicast += sstats->multicast;
stats->collisions += sstats->collisions;
stats->rx_length_errors += sstats->rx_length_errors;
stats->rx_over_errors += sstats->rx_over_errors;
stats->rx_crc_errors += sstats->rx_crc_errors;
stats->rx_frame_errors += sstats->rx_frame_errors;
stats->rx_fifo_errors += sstats->rx_fifo_errors;
stats->rx_missed_errors += sstats->rx_missed_errors;
stats->tx_aborted_errors += sstats->tx_aborted_errors;
stats->tx_carrier_errors += sstats->tx_carrier_errors;
stats->tx_fifo_errors += sstats->tx_fifo_errors;
stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
stats->tx_window_errors += sstats->tx_window_errors;
}
read_unlock_bh(&bond->lock);
return stats;
}
static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
{
struct bonding *bond = netdev_priv(bond_dev);
struct net_device *slave_dev = NULL;
struct ifbond k_binfo;
struct ifbond __user *u_binfo = NULL;
struct ifslave k_sinfo;
struct ifslave __user *u_sinfo = NULL;
struct mii_ioctl_data *mii = NULL;
struct bond_opt_value newval;
struct net *net;
int res = 0;
pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
switch (cmd) {
case SIOCGMIIPHY:
mii = if_mii(ifr);
if (!mii)
return -EINVAL;
mii->phy_id = 0;
/* Fall Through */
case SIOCGMIIREG:
/*
* We do this again just in case we were called by SIOCGMIIREG
* instead of SIOCGMIIPHY.
*/
mii = if_mii(ifr);
if (!mii)
return -EINVAL;
if (mii->reg_num == 1) {
mii->val_out = 0;
read_lock(&bond->lock);
read_lock(&bond->curr_slave_lock);
if (netif_carrier_ok(bond->dev))
mii->val_out = BMSR_LSTATUS;
read_unlock(&bond->curr_slave_lock);
read_unlock(&bond->lock);
}
return 0;
case BOND_INFO_QUERY_OLD:
case SIOCBONDINFOQUERY:
u_binfo = (struct ifbond __user *)ifr->ifr_data;
if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
return -EFAULT;
res = bond_info_query(bond_dev, &k_binfo);
if (res == 0 &&
copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
return -EFAULT;
return res;
case BOND_SLAVE_INFO_QUERY_OLD:
case SIOCBONDSLAVEINFOQUERY:
u_sinfo = (struct ifslave __user *)ifr->ifr_data;
if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
return -EFAULT;
res = bond_slave_info_query(bond_dev, &k_sinfo);
if (res == 0 &&
copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
return -EFAULT;
return res;
default:
/* Go on */
break;
}
net = dev_net(bond_dev);
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
pr_debug("slave_dev=%p:\n", slave_dev);
if (!slave_dev)
return -ENODEV;
pr_debug("slave_dev->name=%s:\n", slave_dev->name);
switch (cmd) {
case BOND_ENSLAVE_OLD:
case SIOCBONDENSLAVE:
res = bond_enslave(bond_dev, slave_dev);
break;
case BOND_RELEASE_OLD:
case SIOCBONDRELEASE:
res = bond_release(bond_dev, slave_dev);
break;
case BOND_SETHWADDR_OLD:
case SIOCBONDSETHWADDR:
bond_set_dev_addr(bond_dev, slave_dev);
res = 0;
break;
case BOND_CHANGE_ACTIVE_OLD:
case SIOCBONDCHANGEACTIVE:
bond_opt_initstr(&newval, slave_dev->name);
res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
break;
default:
res = -EOPNOTSUPP;
}
return res;
}
static void bond_change_rx_flags(struct net_device *bond_dev, int change)
{
struct bonding *bond = netdev_priv(bond_dev);
if (change & IFF_PROMISC)
bond_set_promiscuity(bond,
bond_dev->flags & IFF_PROMISC ? 1 : -1);
if (change & IFF_ALLMULTI)
bond_set_allmulti(bond,
bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
}
static void bond_set_rx_mode(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
rcu_read_lock();
if (USES_PRIMARY(bond->params.mode)) {
slave = rcu_dereference(bond->curr_active_slave);
if (slave) {
dev_uc_sync(slave->dev, bond_dev);
dev_mc_sync(slave->dev, bond_dev);
}
} else {
bond_for_each_slave_rcu(bond, slave, iter) {
dev_uc_sync_multiple(slave->dev, bond_dev);
dev_mc_sync_multiple(slave->dev, bond_dev);
}
}
rcu_read_unlock();
}
static int bond_neigh_init(struct neighbour *n)
{
struct bonding *bond = netdev_priv(n->dev);
const struct net_device_ops *slave_ops;
struct neigh_parms parms;
struct slave *slave;
int ret;
slave = bond_first_slave(bond);
if (!slave)
return 0;
slave_ops = slave->dev->netdev_ops;
if (!slave_ops->ndo_neigh_setup)
return 0;
parms.neigh_setup = NULL;
parms.neigh_cleanup = NULL;
ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
if (ret)
return ret;
/*
* Assign slave's neigh_cleanup to neighbour in case cleanup is called
* after the last slave has been detached. Assumes that all slaves
* utilize the same neigh_cleanup (true at this writing as only user
* is ipoib).
*/
n->parms->neigh_cleanup = parms.neigh_cleanup;
if (!parms.neigh_setup)
return 0;
return parms.neigh_setup(n);
}
/*
* The bonding ndo_neigh_setup is called at init time beofre any
* slave exists. So we must declare proxy setup function which will
* be used at run time to resolve the actual slave neigh param setup.
*
* It's also called by master devices (such as vlans) to setup their
* underlying devices. In that case - do nothing, we're already set up from
* our init.
*/
static int bond_neigh_setup(struct net_device *dev,
struct neigh_parms *parms)
{
/* modify only our neigh_parms */
if (parms->dev == dev)
parms->neigh_setup = bond_neigh_init;
return 0;
}
/*
* Change the MTU of all of a master's slaves to match the master
*/
static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *rollback_slave;
struct list_head *iter;
int res = 0;
pr_debug("bond=%p, name=%s, new_mtu=%d\n",
bond, bond_dev ? bond_dev->name : "None", new_mtu);
/* Can't hold bond->lock with bh disabled here since
* some base drivers panic. On the other hand we can't
* hold bond->lock without bh disabled because we'll
* deadlock. The only solution is to rely on the fact
* that we're under rtnl_lock here, and the slaves
* list won't change. This doesn't solve the problem
* of setting the slave's MTU while it is
* transmitting, but the assumption is that the base
* driver can handle that.
*
* TODO: figure out a way to safely iterate the slaves
* list, but without holding a lock around the actual
* call to the base driver.
*/
bond_for_each_slave(bond, slave, iter) {
pr_debug("s %p c_m %p\n",
slave, slave->dev->netdev_ops->ndo_change_mtu);
res = dev_set_mtu(slave->dev, new_mtu);
if (res) {
/* If we failed to set the slave's mtu to the new value
* we must abort the operation even in ACTIVE_BACKUP
* mode, because if we allow the backup slaves to have
* different mtu values than the active slave we'll
* need to change their mtu when doing a failover. That
* means changing their mtu from timer context, which
* is probably not a good idea.
*/
pr_debug("err %d %s\n", res, slave->dev->name);
goto unwind;
}
}
bond_dev->mtu = new_mtu;
return 0;
unwind:
/* unwind from head to the slave that failed */
bond_for_each_slave(bond, rollback_slave, iter) {
int tmp_res;
if (rollback_slave == slave)
break;
tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
if (tmp_res) {
pr_debug("unwind err %d dev %s\n",
tmp_res, rollback_slave->dev->name);
}
}
return res;
}
/*
* Change HW address
*
* Note that many devices must be down to change the HW address, and
* downing the master releases all slaves. We can make bonds full of
* bonding devices to test this, however.
*/
static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *rollback_slave;
struct sockaddr *sa = addr, tmp_sa;
struct list_head *iter;
int res = 0;
if (bond->params.mode == BOND_MODE_ALB)
return bond_alb_set_mac_address(bond_dev, addr);
pr_debug("bond=%p, name=%s\n",
bond, bond_dev ? bond_dev->name : "None");
/* If fail_over_mac is enabled, do nothing and return success.
* Returning an error causes ifenslave to fail.
*/
if (bond->params.fail_over_mac &&
bond->params.mode == BOND_MODE_ACTIVEBACKUP)
return 0;
if (!is_valid_ether_addr(sa->sa_data))
return -EADDRNOTAVAIL;
/* Can't hold bond->lock with bh disabled here since
* some base drivers panic. On the other hand we can't
* hold bond->lock without bh disabled because we'll
* deadlock. The only solution is to rely on the fact
* that we're under rtnl_lock here, and the slaves
* list won't change. This doesn't solve the problem
* of setting the slave's hw address while it is
* transmitting, but the assumption is that the base
* driver can handle that.
*
* TODO: figure out a way to safely iterate the slaves
* list, but without holding a lock around the actual
* call to the base driver.
*/
bond_for_each_slave(bond, slave, iter) {
pr_debug("slave %p %s\n", slave, slave->dev->name);
res = dev_set_mac_address(slave->dev, addr);
if (res) {
/* TODO: consider downing the slave
* and retry ?
* User should expect communications
* breakage anyway until ARP finish
* updating, so...
*/
pr_debug("err %d %s\n", res, slave->dev->name);
goto unwind;
}
}
/* success */
memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
return 0;
unwind:
memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
tmp_sa.sa_family = bond_dev->type;
/* unwind from head to the slave that failed */
bond_for_each_slave(bond, rollback_slave, iter) {
int tmp_res;
if (rollback_slave == slave)
break;
tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
if (tmp_res) {
pr_debug("unwind err %d dev %s\n",
tmp_res, rollback_slave->dev->name);
}
}
return res;
}
/**
* bond_xmit_slave_id - transmit skb through slave with slave_id
* @bond: bonding device that is transmitting
* @skb: buffer to transmit
* @slave_id: slave id up to slave_cnt-1 through which to transmit
*
* This function tries to transmit through slave with slave_id but in case
* it fails, it tries to find the first available slave for transmission.
* The skb is consumed in all cases, thus the function is void.
*/
static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
{
struct list_head *iter;
struct slave *slave;
int i = slave_id;
/* Here we start from the slave with slave_id */
bond_for_each_slave_rcu(bond, slave, iter) {
if (--i < 0) {
if (slave_can_tx(slave)) {
bond_dev_queue_xmit(bond, skb, slave->dev);
return;
}
}
}
/* Here we start from the first slave up to slave_id */
i = slave_id;
bond_for_each_slave_rcu(bond, slave, iter) {
if (--i < 0)
break;
if (slave_can_tx(slave)) {
bond_dev_queue_xmit(bond, skb, slave->dev);
return;
}
}
/* no slave that can tx has been found */
dev_kfree_skb_any(skb);
}
/**
* bond_rr_gen_slave_id - generate slave id based on packets_per_slave
* @bond: bonding device to use
*
* Based on the value of the bonding device's packets_per_slave parameter
* this function generates a slave id, which is usually used as the next
* slave to transmit through.
*/
static u32 bond_rr_gen_slave_id(struct bonding *bond)
{
u32 slave_id;
struct reciprocal_value reciprocal_packets_per_slave;
int packets_per_slave = bond->params.packets_per_slave;
switch (packets_per_slave) {
case 0:
slave_id = prandom_u32();
break;
case 1:
slave_id = bond->rr_tx_counter;
break;
default:
reciprocal_packets_per_slave =
bond->params.reciprocal_packets_per_slave;
slave_id = reciprocal_divide(bond->rr_tx_counter,
reciprocal_packets_per_slave);
break;
}
bond->rr_tx_counter++;
return slave_id;
}
static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct iphdr *iph = ip_hdr(skb);
struct slave *slave;
u32 slave_id;
/* Start with the curr_active_slave that joined the bond as the
* default for sending IGMP traffic. For failover purposes one
* needs to maintain some consistency for the interface that will
* send the join/membership reports. The curr_active_slave found
* will send all of this type of traffic.
*/
if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
slave = rcu_dereference(bond->curr_active_slave);
if (slave && slave_can_tx(slave))
bond_dev_queue_xmit(bond, skb, slave->dev);
else
bond_xmit_slave_id(bond, skb, 0);
} else {
slave_id = bond_rr_gen_slave_id(bond);
bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
}
return NETDEV_TX_OK;
}
/*
* in active-backup mode, we know that bond->curr_active_slave is always valid if
* the bond has a usable interface.
*/
static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave;
slave = rcu_dereference(bond->curr_active_slave);
if (slave)
bond_dev_queue_xmit(bond, skb, slave->dev);
else
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/* In bond_xmit_xor() , we determine the output device by using a pre-
* determined xmit_hash_policy(), If the selected device is not enabled,
* find the next active slave.
*/
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
return NETDEV_TX_OK;
}
/* in broadcast mode, we send everything to all usable interfaces. */
static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave = NULL;
struct list_head *iter;
bond_for_each_slave_rcu(bond, slave, iter) {
if (bond_is_last_slave(bond, slave))
break;
if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2) {
net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
bond_dev->name, __func__);
continue;
}
/* bond_dev_queue_xmit always returns 0 */
bond_dev_queue_xmit(bond, skb2, slave->dev);
}
}
if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
bond_dev_queue_xmit(bond, skb, slave->dev);
else
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/*------------------------- Device initialization ---------------------------*/
/*
* Lookup the slave that corresponds to a qid
*/
static inline int bond_slave_override(struct bonding *bond,
struct sk_buff *skb)
{
struct slave *slave = NULL;
struct list_head *iter;
if (!skb->queue_mapping)
return 1;
/* Find out if any slaves have the same mapping as this skb. */
bond_for_each_slave_rcu(bond, slave, iter) {
if (slave->queue_id == skb->queue_mapping) {
if (slave_can_tx(slave)) {
bond_dev_queue_xmit(bond, skb, slave->dev);
return 0;
}
/* If the slave isn't UP, use default transmit policy. */
break;
}
}
return 1;
}
static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
/*
* This helper function exists to help dev_pick_tx get the correct
* destination queue. Using a helper function skips a call to
* skb_tx_hash and will put the skbs in the queue we expect on their
* way down to the bonding driver.
*/
u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
/*
* Save the original txq to restore before passing to the driver
*/
qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
if (unlikely(txq >= dev->real_num_tx_queues)) {
do {
txq -= dev->real_num_tx_queues;
} while (txq >= dev->real_num_tx_queues);
}
return txq;
}
static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = netdev_priv(dev);
if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
if (!bond_slave_override(bond, skb))
return NETDEV_TX_OK;
}
switch (bond->params.mode) {
case BOND_MODE_ROUNDROBIN:
return bond_xmit_roundrobin(skb, dev);
case BOND_MODE_ACTIVEBACKUP:
return bond_xmit_activebackup(skb, dev);
case BOND_MODE_XOR:
return bond_xmit_xor(skb, dev);
case BOND_MODE_BROADCAST:
return bond_xmit_broadcast(skb, dev);
case BOND_MODE_8023AD:
return bond_3ad_xmit_xor(skb, dev);
case BOND_MODE_ALB:
case BOND_MODE_TLB:
return bond_alb_xmit(skb, dev);
default:
/* Should never happen, mode already checked */
pr_err("%s: Error: Unknown bonding mode %d\n",
dev->name, bond->params.mode);
WARN_ON_ONCE(1);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
}
static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = netdev_priv(dev);
netdev_tx_t ret = NETDEV_TX_OK;
/*
* If we risk deadlock from transmitting this in the
* netpoll path, tell netpoll to queue the frame for later tx
*/
if (unlikely(is_netpoll_tx_blocked(dev)))
return NETDEV_TX_BUSY;
rcu_read_lock();
if (bond_has_slaves(bond))
ret = __bond_start_xmit(skb, dev);
else
dev_kfree_skb_any(skb);
rcu_read_unlock();
return ret;
}
static int bond_ethtool_get_settings(struct net_device *bond_dev,
struct ethtool_cmd *ecmd)
{
struct bonding *bond = netdev_priv(bond_dev);
unsigned long speed = 0;
struct list_head *iter;
struct slave *slave;
ecmd->duplex = DUPLEX_UNKNOWN;
ecmd->port = PORT_OTHER;
/* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
* do not need to check mode. Though link speed might not represent
* the true receive or transmit bandwidth (not all modes are symmetric)
* this is an accurate maximum.
*/
read_lock(&bond->lock);
bond_for_each_slave(bond, slave, iter) {
if (SLAVE_IS_OK(slave)) {
if (slave->speed != SPEED_UNKNOWN)
speed += slave->speed;
if (ecmd->duplex == DUPLEX_UNKNOWN &&
slave->duplex != DUPLEX_UNKNOWN)
ecmd->duplex = slave->duplex;
}
}
ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
read_unlock(&bond->lock);
return 0;
}
static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
struct ethtool_drvinfo *drvinfo)
{
strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
BOND_ABI_VERSION);
}
static const struct ethtool_ops bond_ethtool_ops = {
.get_drvinfo = bond_ethtool_get_drvinfo,
.get_settings = bond_ethtool_get_settings,
.get_link = ethtool_op_get_link,
};
static const struct net_device_ops bond_netdev_ops = {
.ndo_init = bond_init,
.ndo_uninit = bond_uninit,
.ndo_open = bond_open,
.ndo_stop = bond_close,
.ndo_start_xmit = bond_start_xmit,
.ndo_select_queue = bond_select_queue,
.ndo_get_stats64 = bond_get_stats,
.ndo_do_ioctl = bond_do_ioctl,
.ndo_change_rx_flags = bond_change_rx_flags,
.ndo_set_rx_mode = bond_set_rx_mode,
.ndo_change_mtu = bond_change_mtu,
.ndo_set_mac_address = bond_set_mac_address,
.ndo_neigh_setup = bond_neigh_setup,
.ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_netpoll_setup = bond_netpoll_setup,
.ndo_netpoll_cleanup = bond_netpoll_cleanup,
.ndo_poll_controller = bond_poll_controller,
#endif
.ndo_add_slave = bond_enslave,
.ndo_del_slave = bond_release,
.ndo_fix_features = bond_fix_features,
};
static const struct device_type bond_type = {
.name = "bond",
};
static void bond_destructor(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
if (bond->wq)
destroy_workqueue(bond->wq);
free_netdev(bond_dev);
}
void bond_setup(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
/* initialize rwlocks */
rwlock_init(&bond->lock);
rwlock_init(&bond->curr_slave_lock);
bond->params = bonding_defaults;
/* Initialize pointers */
bond->dev = bond_dev;
/* Initialize the device entry points */
ether_setup(bond_dev);
bond_dev->netdev_ops = &bond_netdev_ops;
bond_dev->ethtool_ops = &bond_ethtool_ops;
bond_dev->destructor = bond_destructor;
SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
/* Initialize the device options */
bond_dev->tx_queue_len = 0;
bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
bond_dev->priv_flags |= IFF_BONDING;
bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
/* At first, we block adding VLANs. That's the only way to
* prevent problems that occur when adding VLANs over an
* empty bond. The block will be removed once non-challenged
* slaves are enslaved.
*/
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
/* don't acquire bond device's netif_tx_lock when
* transmitting */
bond_dev->features |= NETIF_F_LLTX;
/* By default, we declare the bond to be fully
* VLAN hardware accelerated capable. Special
* care is taken in the various xmit functions
* when there are slaves that are not hw accel
* capable
*/
/* Don't allow bond devices to change network namespaces. */
bond_dev->features |= NETIF_F_NETNS_LOCAL;
bond_dev->hw_features = BOND_VLAN_FEATURES |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER;
bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
bond_dev->features |= bond_dev->hw_features;
}
/*
* Destroy a bonding device.
* Must be under rtnl_lock when this function is called.
*/
static void bond_uninit(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
bond_netpoll_cleanup(bond_dev);
/* Release the bonded slaves */
bond_for_each_slave(bond, slave, iter)
__bond_release_one(bond_dev, slave->dev, true);
pr_info("%s: Released all slaves\n", bond_dev->name);
list_del(&bond->bond_list);
bond_debug_unregister(bond);
}
/*------------------------- Module initialization ---------------------------*/
static int bond_check_params(struct bond_params *params)
{
int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
struct bond_opt_value newval;
const struct bond_opt_value *valptr;
int arp_all_targets_value;
/*
* Convert string parameters.
*/
if (mode) {
bond_opt_initstr(&newval, mode);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
if (!valptr) {
pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
return -EINVAL;
}
bond_mode = valptr->value;
}
if (xmit_hash_policy) {
if ((bond_mode != BOND_MODE_XOR) &&
(bond_mode != BOND_MODE_8023AD)) {
pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
bond_opt_initstr(&newval, xmit_hash_policy);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
&newval);
if (!valptr) {
pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
xmit_hash_policy);
return -EINVAL;
}
xmit_hashtype = valptr->value;
}
}
if (lacp_rate) {
if (bond_mode != BOND_MODE_8023AD) {
pr_info("lacp_rate param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
bond_opt_initstr(&newval, lacp_rate);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
&newval);
if (!valptr) {
pr_err("Error: Invalid lacp rate \"%s\"\n",
lacp_rate);
return -EINVAL;
}
lacp_fast = valptr->value;
}
}
if (ad_select) {
bond_opt_initstr(&newval, lacp_rate);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
&newval);
if (!valptr) {
pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
return -EINVAL;
}
params->ad_select = valptr->value;
if (bond_mode != BOND_MODE_8023AD)
pr_warn("ad_select param only affects 802.3ad mode\n");
} else {
params->ad_select = BOND_AD_STABLE;
}
if (max_bonds < 0) {
pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
max_bonds = BOND_DEFAULT_MAX_BONDS;
}
if (miimon < 0) {
pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
miimon, INT_MAX);
miimon = 0;
}
if (updelay < 0) {
pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
updelay, INT_MAX);
updelay = 0;
}
if (downdelay < 0) {
pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
downdelay, INT_MAX);
downdelay = 0;
}
if ((use_carrier != 0) && (use_carrier != 1)) {
pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
use_carrier);
use_carrier = 1;
}
if (num_peer_notif < 0 || num_peer_notif > 255) {
pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
num_peer_notif);
num_peer_notif = 1;
}
/* reset values for 802.3ad/TLB/ALB */
if (BOND_NO_USES_ARP(bond_mode)) {
if (!miimon) {
pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
pr_warn("Forcing miimon to 100msec\n");
miimon = BOND_DEFAULT_MIIMON;
}
}
if (tx_queues < 1 || tx_queues > 255) {
pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
tx_queues, BOND_DEFAULT_TX_QUEUES);
tx_queues = BOND_DEFAULT_TX_QUEUES;
}
if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
all_slaves_active);
all_slaves_active = 0;
}
if (resend_igmp < 0 || resend_igmp > 255) {
pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
resend_igmp, BOND_DEFAULT_RESEND_IGMP);
resend_igmp = BOND_DEFAULT_RESEND_IGMP;
}
bond_opt_initval(&newval, packets_per_slave);
if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
packets_per_slave, USHRT_MAX);
packets_per_slave = 1;
}
if (bond_mode == BOND_MODE_ALB) {
pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
updelay);
}
if (!miimon) {
if (updelay || downdelay) {
/* just warn the user the up/down delay will have
* no effect since miimon is zero...
*/
pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
updelay, downdelay);
}
} else {
/* don't allow arp monitoring */
if (arp_interval) {
pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
miimon, arp_interval);
arp_interval = 0;
}
if ((updelay % miimon) != 0) {
pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
updelay, miimon, (updelay / miimon) * miimon);
}
updelay /= miimon;
if ((downdelay % miimon) != 0) {
pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
downdelay, miimon,
(downdelay / miimon) * miimon);
}
downdelay /= miimon;
}
if (arp_interval < 0) {
pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
arp_interval, INT_MAX);
arp_interval = 0;
}
for (arp_ip_count = 0, i = 0;
(arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
/* not complete check, but should be good enough to
catch mistakes */
__be32 ip;
if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
arp_ip_target[i]);
arp_interval = 0;
} else {
if (bond_get_targets_ip(arp_target, ip) == -1)
arp_target[arp_ip_count++] = ip;
else
pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
&ip);
}
}
if (arp_interval && !arp_ip_count) {
/* don't allow arping if no arp_ip_target given... */
pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
arp_interval);
arp_interval = 0;
}
if (arp_validate) {
if (!arp_interval) {
pr_err("arp_validate requires arp_interval\n");
return -EINVAL;
}
bond_opt_initstr(&newval, arp_validate);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
&newval);
if (!valptr) {
pr_err("Error: invalid arp_validate \"%s\"\n",
arp_validate);
return -EINVAL;
}
arp_validate_value = valptr->value;
} else {
arp_validate_value = 0;
}
arp_all_targets_value = 0;
if (arp_all_targets) {
bond_opt_initstr(&newval, arp_all_targets);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
&newval);
if (!valptr) {
pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
arp_all_targets);
arp_all_targets_value = 0;
} else {
arp_all_targets_value = valptr->value;
}
}
if (miimon) {
pr_info("MII link monitoring set to %d ms\n", miimon);
} else if (arp_interval) {
valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
arp_validate_value);
pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
arp_interval, valptr->string, arp_ip_count);
for (i = 0; i < arp_ip_count; i++)
pr_cont(" %s", arp_ip_target[i]);
pr_cont("\n");
} else if (max_bonds) {
/* miimon and arp_interval not set, we need one so things
* work as expected, see bonding.txt for details
*/
pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
}
if (primary && !USES_PRIMARY(bond_mode)) {
/* currently, using a primary only makes sense
* in active backup, TLB or ALB modes
*/
pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
primary, bond_mode_name(bond_mode));
primary = NULL;
}
if (primary && primary_reselect) {
bond_opt_initstr(&newval, primary_reselect);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
&newval);
if (!valptr) {
pr_err("Error: Invalid primary_reselect \"%s\"\n",
primary_reselect);
return -EINVAL;
}
primary_reselect_value = valptr->value;
} else {
primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
}
if (fail_over_mac) {
bond_opt_initstr(&newval, fail_over_mac);
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
&newval);
if (!valptr) {
pr_err("Error: invalid fail_over_mac \"%s\"\n",
fail_over_mac);
return -EINVAL;
}
fail_over_mac_value = valptr->value;
if (bond_mode != BOND_MODE_ACTIVEBACKUP)
pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
} else {
fail_over_mac_value = BOND_FOM_NONE;
}
if (lp_interval == 0) {
pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
}
/* fill params struct with the proper values */
params->mode = bond_mode;
params->xmit_policy = xmit_hashtype;
params->miimon = miimon;
params->num_peer_notif = num_peer_notif;
params->arp_interval = arp_interval;
params->arp_validate = arp_validate_value;
params->arp_all_targets = arp_all_targets_value;
params->updelay = updelay;
params->downdelay = downdelay;
params->use_carrier = use_carrier;
params->lacp_fast = lacp_fast;
params->primary[0] = 0;
params->primary_reselect = primary_reselect_value;
params->fail_over_mac = fail_over_mac_value;
params->tx_queues = tx_queues;
params->all_slaves_active = all_slaves_active;
params->resend_igmp = resend_igmp;
params->min_links = min_links;
params->lp_interval = lp_interval;
params->packets_per_slave = packets_per_slave;
if (packets_per_slave > 0) {
params->reciprocal_packets_per_slave =
reciprocal_value(packets_per_slave);
} else {
/* reciprocal_packets_per_slave is unused if
* packets_per_slave is 0 or 1, just initialize it
*/
params->reciprocal_packets_per_slave =
(struct reciprocal_value) { 0 };
}
if (primary) {
strncpy(params->primary, primary, IFNAMSIZ);
params->primary[IFNAMSIZ - 1] = 0;
}
memcpy(params->arp_targets, arp_target, sizeof(arp_target));
return 0;
}
static struct lock_class_key bonding_netdev_xmit_lock_key;
static struct lock_class_key bonding_netdev_addr_lock_key;
static struct lock_class_key bonding_tx_busylock_key;
static void bond_set_lockdep_class_one(struct net_device *dev,
struct netdev_queue *txq,
void *_unused)
{
lockdep_set_class(&txq->_xmit_lock,
&bonding_netdev_xmit_lock_key);
}
static void bond_set_lockdep_class(struct net_device *dev)
{
lockdep_set_class(&dev->addr_list_lock,
&bonding_netdev_addr_lock_key);
netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
}
/*
* Called from registration process
*/
static int bond_init(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
pr_debug("Begin bond_init for %s\n", bond_dev->name);
/*
* Initialize locks that may be required during
* en/deslave operations. All of the bond_open work
* (of which this is part) should really be moved to
* a phase prior to dev_open
*/
spin_lock_init(&(bond_info->tx_hashtbl_lock));
spin_lock_init(&(bond_info->rx_hashtbl_lock));
bond->wq = create_singlethread_workqueue(bond_dev->name);
if (!bond->wq)
return -ENOMEM;
bond_set_lockdep_class(bond_dev);
list_add_tail(&bond->bond_list, &bn->dev_list);
bond_prepare_sysfs_group(bond);
bond_debug_register(bond);
/* Ensure valid dev_addr */
if (is_zero_ether_addr(bond_dev->dev_addr) &&
bond_dev->addr_assign_type == NET_ADDR_PERM)
eth_hw_addr_random(bond_dev);
return 0;
}
unsigned int bond_get_num_tx_queues(void)
{
return tx_queues;
}
/* Create a new bond based on the specified name and bonding parameters.
* If name is NULL, obtain a suitable "bond%d" name for us.
* Caller must NOT hold rtnl_lock; we need to release it here before we
* set up our sysfs entries.
*/
int bond_create(struct net *net, const char *name)
{
struct net_device *bond_dev;
int res;
rtnl_lock();
bond_dev = alloc_netdev_mq(sizeof(struct bonding),
name ? name : "bond%d",
bond_setup, tx_queues);
if (!bond_dev) {
pr_err("%s: eek! can't alloc netdev!\n", name);
rtnl_unlock();
return -ENOMEM;
}
dev_net_set(bond_dev, net);
bond_dev->rtnl_link_ops = &bond_link_ops;
res = register_netdevice(bond_dev);
netif_carrier_off(bond_dev);
rtnl_unlock();
if (res < 0)
bond_destructor(bond_dev);
return res;
}
static int __net_init bond_net_init(struct net *net)
{
struct bond_net *bn = net_generic(net, bond_net_id);
bn->net = net;
INIT_LIST_HEAD(&bn->dev_list);
bond_create_proc_dir(bn);
bond_create_sysfs(bn);
return 0;
}
static void __net_exit bond_net_exit(struct net *net)
{
struct bond_net *bn = net_generic(net, bond_net_id);
struct bonding *bond, *tmp_bond;
LIST_HEAD(list);
bond_destroy_sysfs(bn);
bond_destroy_proc_dir(bn);
/* Kill off any bonds created after unregistering bond rtnl ops */
rtnl_lock();
list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
unregister_netdevice_queue(bond->dev, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations bond_net_ops = {
.init = bond_net_init,
.exit = bond_net_exit,
.id = &bond_net_id,
.size = sizeof(struct bond_net),
};
static int __init bonding_init(void)
{
int i;
int res;
pr_info("%s", bond_version);
res = bond_check_params(&bonding_defaults);
if (res)
goto out;
res = register_pernet_subsys(&bond_net_ops);
if (res)
goto out;
res = bond_netlink_init();
if (res)
goto err_link;
bond_create_debugfs();
for (i = 0; i < max_bonds; i++) {
res = bond_create(&init_net, NULL);
if (res)
goto err;
}
register_netdevice_notifier(&bond_netdev_notifier);
out:
return res;
err:
bond_netlink_fini();
err_link:
unregister_pernet_subsys(&bond_net_ops);
goto out;
}
static void __exit bonding_exit(void)
{
unregister_netdevice_notifier(&bond_netdev_notifier);
bond_destroy_debugfs();
bond_netlink_fini();
unregister_pernet_subsys(&bond_net_ops);
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
* Make sure we don't have an imbalance on our netpoll blocking
*/
WARN_ON(atomic_read(&netpoll_block_tx));
#endif
}
module_init(bonding_init);
module_exit(bonding_exit);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");