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linux/drivers/net/bonding/bond_main.c
Adrian Bunk 4ad072c984 bonding/bond_main.c: make 2 functions static 
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Chad Tindel <ctindel@users.sourceforge.net>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-07-10 14:31:45 -04:00

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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 BONDING_DEBUG 1
#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 <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/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/proc_fs.h>
#include <linux/seq_file.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 <net/route.h>
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"
/*---------------------------- Module parameters ----------------------------*/
/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#define BOND_LINK_MON_INTERV 0
#define BOND_LINK_ARP_INTERV 0
static int max_bonds = BOND_DEFAULT_MAX_BONDS;
static int miimon = BOND_LINK_MON_INTERV;
static int updelay = 0;
static int downdelay = 0;
static int use_carrier = 1;
static char *mode = NULL;
static char *primary = NULL;
static char *lacp_rate = NULL;
static char *xmit_hash_policy = NULL;
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
static char *arp_validate = NULL;
struct bond_params bonding_defaults;
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
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(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
"(slow/fast)");
module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
", 1 for 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: none (default), active, backup or all");
/*----------------------------- Global variables ----------------------------*/
static const char * const version =
DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
LIST_HEAD(bond_dev_list);
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
#endif
extern struct rw_semaphore bonding_rwsem;
static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
static int arp_ip_count = 0;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
static int lacp_fast = 0;
struct bond_parm_tbl bond_lacp_tbl[] = {
{ "slow", AD_LACP_SLOW},
{ "fast", AD_LACP_FAST},
{ NULL, -1},
};
struct bond_parm_tbl bond_mode_tbl[] = {
{ "balance-rr", BOND_MODE_ROUNDROBIN},
{ "active-backup", BOND_MODE_ACTIVEBACKUP},
{ "balance-xor", BOND_MODE_XOR},
{ "broadcast", BOND_MODE_BROADCAST},
{ "802.3ad", BOND_MODE_8023AD},
{ "balance-tlb", BOND_MODE_TLB},
{ "balance-alb", BOND_MODE_ALB},
{ NULL, -1},
};
struct bond_parm_tbl xmit_hashtype_tbl[] = {
{ "layer2", BOND_XMIT_POLICY_LAYER2},
{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
{ NULL, -1},
};
struct bond_parm_tbl arp_validate_tbl[] = {
{ "none", BOND_ARP_VALIDATE_NONE},
{ "active", BOND_ARP_VALIDATE_ACTIVE},
{ "backup", BOND_ARP_VALIDATE_BACKUP},
{ "all", BOND_ARP_VALIDATE_ALL},
{ NULL, -1},
};
/*-------------------------- Forward declarations ---------------------------*/
static void bond_send_gratuitous_arp(struct bonding *bond);
/*---------------------------- General routines -----------------------------*/
static const char *bond_mode_name(int mode)
{
switch (mode) {
case BOND_MODE_ROUNDROBIN :
return "load balancing (round-robin)";
case BOND_MODE_ACTIVEBACKUP :
return "fault-tolerance (active-backup)";
case BOND_MODE_XOR :
return "load balancing (xor)";
case BOND_MODE_BROADCAST :
return "fault-tolerance (broadcast)";
case BOND_MODE_8023AD:
return "IEEE 802.3ad Dynamic link aggregation";
case BOND_MODE_TLB:
return "transmit load balancing";
case BOND_MODE_ALB:
return "adaptive load balancing";
default:
return "unknown";
}
}
/*---------------------------------- VLAN -----------------------------------*/
/**
* bond_add_vlan - add a new vlan id on bond
* @bond: bond that got the notification
* @vlan_id: the vlan id to add
*
* Returns -ENOMEM if allocation failed.
*/
static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
{
struct vlan_entry *vlan;
dprintk("bond: %s, vlan id %d\n",
(bond ? bond->dev->name: "None"), vlan_id);
vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
if (!vlan) {
return -ENOMEM;
}
INIT_LIST_HEAD(&vlan->vlan_list);
vlan->vlan_id = vlan_id;
vlan->vlan_ip = 0;
write_lock_bh(&bond->lock);
list_add_tail(&vlan->vlan_list, &bond->vlan_list);
write_unlock_bh(&bond->lock);
dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
return 0;
}
/**
* bond_del_vlan - delete a vlan id from bond
* @bond: bond that got the notification
* @vlan_id: the vlan id to delete
*
* returns -ENODEV if @vlan_id was not found in @bond.
*/
static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
{
struct vlan_entry *vlan, *next;
int res = -ENODEV;
dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
write_lock_bh(&bond->lock);
list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
if (vlan->vlan_id == vlan_id) {
list_del(&vlan->vlan_list);
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_clear_vlan(bond, vlan_id);
}
dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
bond->dev->name);
kfree(vlan);
if (list_empty(&bond->vlan_list) &&
(bond->slave_cnt == 0)) {
/* Last VLAN removed and no slaves, so
* restore block on adding VLANs. This will
* be removed once new slaves that are not
* VLAN challenged will be added.
*/
bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
}
res = 0;
goto out;
}
}
dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
bond->dev->name);
out:
write_unlock_bh(&bond->lock);
return res;
}
/**
* bond_has_challenged_slaves
* @bond: the bond we're working on
*
* Searches the slave list. Returns 1 if a vlan challenged slave
* was found, 0 otherwise.
*
* Assumes bond->lock is held.
*/
static int bond_has_challenged_slaves(struct bonding *bond)
{
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
dprintk("found VLAN challenged slave - %s\n",
slave->dev->name);
return 1;
}
}
dprintk("no VLAN challenged slaves found\n");
return 0;
}
/**
* bond_next_vlan - safely skip to the next item in the vlans list.
* @bond: the bond we're working on
* @curr: item we're advancing from
*
* Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
* or @curr->next otherwise (even if it is @curr itself again).
*
* Caller must hold bond->lock
*/
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
struct vlan_entry *next, *last;
if (list_empty(&bond->vlan_list)) {
return NULL;
}
if (!curr) {
next = list_entry(bond->vlan_list.next,
struct vlan_entry, vlan_list);
} else {
last = list_entry(bond->vlan_list.prev,
struct vlan_entry, vlan_list);
if (last == curr) {
next = list_entry(bond->vlan_list.next,
struct vlan_entry, vlan_list);
} else {
next = list_entry(curr->vlan_list.next,
struct vlan_entry, vlan_list);
}
}
return next;
}
/**
* 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
*
* When the bond gets an skb to transmit that is
* already hardware accelerated VLAN tagged, and it
* needs to relay this skb to a slave that is not
* hw accel capable, the skb needs to be "unaccelerated",
* i.e. strip the hwaccel tag and re-insert it as part
* of the payload.
*/
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
{
unsigned short vlan_id;
if (!list_empty(&bond->vlan_list) &&
!(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
vlan_get_tag(skb, &vlan_id) == 0) {
skb->dev = slave_dev;
skb = vlan_put_tag(skb, vlan_id);
if (!skb) {
/* vlan_put_tag() frees the skb in case of error,
* so return success here so the calling functions
* won't attempt to free is again.
*/
return 0;
}
} else {
skb->dev = slave_dev;
}
skb->priority = 1;
dev_queue_xmit(skb);
return 0;
}
/*
* In the following 3 functions, bond_vlan_rx_register(), 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_register - Propagates registration to slaves
* @bond_dev: bonding net device that got called
* @grp: vlan group being registered
*/
static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i;
bond->vlgrp = grp;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, grp);
}
}
}
/**
* 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 void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i, res;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
slave_dev->vlan_rx_add_vid) {
slave_dev->vlan_rx_add_vid(slave_dev, vid);
}
}
res = bond_add_vlan(bond, vid);
if (res) {
printk(KERN_ERR DRV_NAME
": %s: Error: Failed to add vlan id %d\n",
bond_dev->name, vid);
}
}
/**
* 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 void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
struct net_device *vlan_dev;
int i, res;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
slave_dev->vlan_rx_kill_vid) {
/* Save and then restore vlan_dev in the grp array,
* since the slave's driver might clear it.
*/
vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
slave_dev->vlan_rx_kill_vid(slave_dev, vid);
vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
}
}
res = bond_del_vlan(bond, vid);
if (res) {
printk(KERN_ERR DRV_NAME
": %s: Error: Failed to remove vlan id %d\n",
bond_dev->name, vid);
}
}
static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
struct vlan_entry *vlan;
write_lock_bh(&bond->lock);
if (list_empty(&bond->vlan_list)) {
goto out;
}
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
}
if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
!(slave_dev->vlan_rx_add_vid)) {
goto out;
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
}
out:
write_unlock_bh(&bond->lock);
}
static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
{
struct vlan_entry *vlan;
struct net_device *vlan_dev;
write_lock_bh(&bond->lock);
if (list_empty(&bond->vlan_list)) {
goto out;
}
if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
!(slave_dev->vlan_rx_kill_vid)) {
goto unreg;
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
/* Save and then restore vlan_dev in the grp array,
* since the slave's driver might clear it.
*/
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
}
unreg:
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, NULL);
}
out:
write_unlock_bh(&bond->lock);
}
/*------------------------------- 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 slave *slave;
int i;
if (bond->slave_cnt == 0)
goto down;
if (bond->params.mode == BOND_MODE_8023AD)
return bond_3ad_set_carrier(bond);
bond_for_each_slave(bond, slave, i) {
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, fake speed and duplex to 100/Full
* and return error.
*/
static int bond_update_speed_duplex(struct slave *slave)
{
struct net_device *slave_dev = slave->dev;
static int (* ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct ethtool_cmd etool;
/* Fake speed and duplex */
slave->speed = SPEED_100;
slave->duplex = DUPLEX_FULL;
if (slave_dev->ethtool_ops) {
int res;
if (!slave_dev->ethtool_ops->get_settings) {
return -1;
}
res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
if (res < 0) {
return -1;
}
goto verify;
}
ioctl = slave_dev->do_ioctl;
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
etool.cmd = ETHTOOL_GSET;
ifr.ifr_data = (char*)&etool;
if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
return -1;
}
verify:
switch (etool.speed) {
case SPEED_10:
case SPEED_100:
case SPEED_1000:
case SPEED_10000:
break;
default:
return -1;
}
switch (etool.duplex) {
case DUPLEX_FULL:
case DUPLEX_HALF:
break;
default:
return -1;
}
slave->speed = etool.speed;
slave->duplex = etool.duplex;
return 0;
}
/*
* if <dev> supports MII link status reporting, check its link status.
*
* We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
* depening 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)
{
static int (* ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct mii_ioctl_data *mii;
struct ethtool_value etool;
if (bond->params.use_carrier) {
return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
}
ioctl = slave_dev->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);
}
}
}
/* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
/* for a period of time so we attempt to get link status */
/* from it last if the above MII ioctls fail... */
if (slave_dev->ethtool_ops) {
if (slave_dev->ethtool_ops->get_link) {
u32 link;
link = slave_dev->ethtool_ops->get_link(slave_dev);
return link ? BMSR_LSTATUS : 0;
}
}
if (ioctl) {
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
etool.cmd = ETHTOOL_GLINK;
ifr.ifr_data = (char*)&etool;
if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
if (etool.data == 1) {
return BMSR_LSTATUS;
} else {
dprintk("SIOCETHTOOL shows link down\n");
return 0;
}
}
}
/*
* If reporting, report that either there's no dev->do_ioctl,
* or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
* cannot report link status). If not reporting, pretend
* we're ok.
*/
return (reporting ? -1 : BMSR_LSTATUS);
}
/*----------------------------- Multicast list ------------------------------*/
/*
* Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
*/
static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
{
return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
dmi1->dmi_addrlen == dmi2->dmi_addrlen;
}
/*
* returns dmi entry if found, NULL otherwise
*/
static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
{
struct dev_mc_list *idmi;
for (idmi = mc_list; idmi; idmi = idmi->next) {
if (bond_is_dmi_same(dmi, idmi)) {
return idmi;
}
}
return NULL;
}
/*
* Push the promiscuity flag down to appropriate slaves
*/
static void bond_set_promiscuity(struct bonding *bond, int inc)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_set_promiscuity(bond->curr_active_slave->dev, inc);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_set_promiscuity(slave->dev, inc);
}
}
}
/*
* Push the allmulti flag down to all slaves
*/
static void bond_set_allmulti(struct bonding *bond, int inc)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_set_allmulti(bond->curr_active_slave->dev, inc);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_set_allmulti(slave->dev, inc);
}
}
}
/*
* Add a Multicast address to slaves
* according to mode
*/
static void bond_mc_add(struct bonding *bond, void *addr, int alen)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_mc_add(slave->dev, addr, alen, 0);
}
}
}
/*
* Remove a multicast address from slave
* according to mode
*/
static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_mc_delete(slave->dev, addr, alen, 0);
}
}
}
/*
* 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(struct bonding *bond)
{
struct in_device *in_dev;
struct ip_mc_list *im;
rcu_read_lock();
in_dev = __in_dev_get_rcu(bond->dev);
if (in_dev) {
for (im = in_dev->mc_list; im; im = im->next) {
ip_mc_rejoin_group(im);
}
}
rcu_read_unlock();
}
/*
* Totally destroys the mc_list in bond
*/
static void bond_mc_list_destroy(struct bonding *bond)
{
struct dev_mc_list *dmi;
dmi = bond->mc_list;
while (dmi) {
bond->mc_list = dmi->next;
kfree(dmi);
dmi = bond->mc_list;
}
bond->mc_list = NULL;
}
/*
* Copy all the Multicast addresses from src to the bonding device dst
*/
static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
gfp_t gfp_flag)
{
struct dev_mc_list *dmi, *new_dmi;
for (dmi = mc_list; dmi; dmi = dmi->next) {
new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
if (!new_dmi) {
/* FIXME: Potential memory leak !!! */
return -ENOMEM;
}
new_dmi->next = bond->mc_list;
bond->mc_list = new_dmi;
new_dmi->dmi_addrlen = dmi->dmi_addrlen;
memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
new_dmi->dmi_users = dmi->dmi_users;
new_dmi->dmi_gusers = dmi->dmi_gusers;
}
return 0;
}
/*
* flush all members of flush->mc_list from device dev->mc_list
*/
static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct dev_mc_list *dmi;
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
if (bond->params.mode == BOND_MODE_8023AD) {
/* del lacpdu mc addr from mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
}
}
/*--------------------------- Active slave change ---------------------------*/
/*
* Update the mc list and multicast-related flags for the new and
* old active slaves (if any) according to the multicast mode, and
* promiscuous flags unconditionally.
*/
static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
{
struct dev_mc_list *dmi;
if (!USES_PRIMARY(bond->params.mode)) {
/* nothing to do - mc list is already up-to-date on
* all slaves
*/
return;
}
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);
}
for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
}
if (new_active) {
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);
}
for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
bond_resend_igmp_join_requests(bond);
}
}
/**
* find_best_interface - select the best available slave to be the active one
* @bond: our bonding struct
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
static struct slave *bond_find_best_slave(struct bonding *bond)
{
struct slave *new_active, *old_active;
struct slave *bestslave = NULL;
int mintime = bond->params.updelay;
int i;
new_active = old_active = bond->curr_active_slave;
if (!new_active) { /* there were no active slaves left */
if (bond->slave_cnt > 0) { /* found one slave */
new_active = bond->first_slave;
} else {
return NULL; /* still no slave, return NULL */
}
}
/* first try the primary link; if arping, a link must tx/rx traffic
* before it can be considered the curr_active_slave - also, we would skip
* slaves between the curr_active_slave and primary_slave that may be up
* and able to arp
*/
if ((bond->primary_slave) &&
(!bond->params.arp_interval) &&
(IS_UP(bond->primary_slave->dev))) {
new_active = bond->primary_slave;
}
/* remember where to stop iterating over the slaves */
old_active = new_active;
bond_for_each_slave_from(bond, new_active, i, old_active) {
if (IS_UP(new_active->dev)) {
if (new_active->link == BOND_LINK_UP) {
return new_active;
} else if (new_active->link == BOND_LINK_BACK) {
/* link up, but waiting for stabilization */
if (new_active->delay < mintime) {
mintime = new_active->delay;
bestslave = new_active;
}
}
}
}
return bestslave;
}
/**
* 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.
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
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) {
if (new_active->link == BOND_LINK_BACK) {
if (USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %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;
new_active->jiffies = jiffies;
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
}
} else {
if (USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: making interface %s the new "
"active one.\n",
bond->dev->name, new_active->dev->name);
}
}
}
if (USES_PRIMARY(bond->params.mode)) {
bond_mc_swap(bond, new_active, old_active);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_active_change(bond, new_active);
if (old_active)
bond_set_slave_inactive_flags(old_active);
if (new_active)
bond_set_slave_active_flags(new_active);
} else {
bond->curr_active_slave = new_active;
}
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
if (old_active) {
bond_set_slave_inactive_flags(old_active);
}
if (new_active) {
bond_set_slave_active_flags(new_active);
}
bond_send_gratuitous_arp(bond);
}
}
/**
* bond_select_active_slave - select a new active slave, if needed
* @bond: our bonding struct
*
* This functions shoud 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.
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
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)) {
printk(KERN_INFO DRV_NAME
": %s: first active interface up!\n",
bond->dev->name);
} else {
printk(KERN_INFO DRV_NAME ": %s: "
"now running without any active interface !\n",
bond->dev->name);
}
}
}
/*--------------------------- slave list handling ---------------------------*/
/*
* This function attaches the slave to the end of list.
*
* bond->lock held for writing by caller.
*/
static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
{
if (bond->first_slave == NULL) { /* attaching the first slave */
new_slave->next = new_slave;
new_slave->prev = new_slave;
bond->first_slave = new_slave;
} else {
new_slave->next = bond->first_slave;
new_slave->prev = bond->first_slave->prev;
new_slave->next->prev = new_slave;
new_slave->prev->next = new_slave;
}
bond->slave_cnt++;
}
/*
* This function detaches the slave from the list.
* WARNING: no check is made to verify if the slave effectively
* belongs to <bond>.
* Nothing is freed on return, structures are just unchained.
* If any slave pointer in bond was pointing to <slave>,
* it should be changed by the calling function.
*
* bond->lock held for writing by caller.
*/
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
if (slave->next) {
slave->next->prev = slave->prev;
}
if (slave->prev) {
slave->prev->next = slave->next;
}
if (bond->first_slave == slave) { /* slave is the first slave */
if (bond->slave_cnt > 1) { /* there are more slave */
bond->first_slave = slave->next;
} else {
bond->first_slave = NULL; /* slave was the last one */
}
}
slave->next = NULL;
slave->prev = NULL;
bond->slave_cnt--;
}
/*---------------------------------- IOCTL ----------------------------------*/
static int bond_sethwaddr(struct net_device *bond_dev,
struct net_device *slave_dev)
{
dprintk("bond_dev=%p\n", bond_dev);
dprintk("slave_dev=%p\n", slave_dev);
dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
return 0;
}
#define BOND_INTERSECT_FEATURES \
(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
/*
* Compute the common dev->feature set available to all slaves. Some
* feature bits are managed elsewhere, so preserve feature bits set on
* master device that are not part of the examined set.
*/
static int bond_compute_features(struct bonding *bond)
{
unsigned long features = BOND_INTERSECT_FEATURES;
struct slave *slave;
struct net_device *bond_dev = bond->dev;
unsigned short max_hard_header_len = ETH_HLEN;
int i;
bond_for_each_slave(bond, slave, i) {
features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
if (slave->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = slave->dev->hard_header_len;
}
if ((features & NETIF_F_SG) &&
!(features & NETIF_F_ALL_CSUM))
features &= ~NETIF_F_SG;
/*
* features will include NETIF_F_TSO (NETIF_F_UFO) iff all
* slave devices support NETIF_F_TSO (NETIF_F_UFO), which
* implies that all slaves also support scatter-gather
* (NETIF_F_SG), which implies that features also includes
* NETIF_F_SG. So no need to check whether we have an
* illegal combination of NETIF_F_{TSO,UFO} and
* !NETIF_F_SG
*/
features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
bond_dev->features = features;
bond_dev->hard_header_len = max_hard_header_len;
return 0;
}
/* enslave device <slave> to bond device <master> */
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *new_slave = NULL;
struct dev_mc_list *dmi;
struct sockaddr addr;
int link_reporting;
int old_features = bond_dev->features;
int res = 0;
if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
slave_dev->do_ioctl == NULL) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: no link monitoring support for %s\n",
bond_dev->name, slave_dev->name);
}
/* bond must be initialized by bond_open() before enslaving */
if (!(bond_dev->flags & IFF_UP)) {
dprintk("Error, master_dev is not up\n");
return -EPERM;
}
/* already enslaved */
if (slave_dev->flags & IFF_SLAVE) {
dprintk("Error, Device was already enslaved\n");
return -EBUSY;
}
/* vlan challenged mutual exclusion */
/* no need to lock since we're protected by rtnl_lock */
if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
if (!list_empty(&bond->vlan_list)) {
printk(KERN_ERR DRV_NAME
": %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 {
printk(KERN_WARNING DRV_NAME
": %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);
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
}
} else {
dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
if (bond->slave_cnt == 0) {
/* First slave, and it is not VLAN challenged,
* so remove the block of adding VLANs over the bond.
*/
bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
}
}
/*
* Old ifenslave binaries are no longer supported. These can
* be identified with moderate accurary 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)) {
printk(KERN_ERR DRV_NAME ": %s is up. "
"This may be due to an out of date ifenslave.\n",
slave_dev->name);
res = -EPERM;
goto err_undo_flags;
}
if (slave_dev->set_mac_address == NULL) {
printk(KERN_ERR DRV_NAME
": %s: Error: The slave device you specified does "
"not support setting the MAC address. "
"Your kernel likely does not support slave "
"devices.\n", bond_dev->name);
res = -EOPNOTSUPP;
goto err_undo_flags;
}
new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
if (!new_slave) {
res = -ENOMEM;
goto err_undo_flags;
}
/* save slave's original flags before calling
* netdev_set_master and dev_open
*/
new_slave->original_flags = slave_dev->flags;
/*
* 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
*/
memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
/*
* 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) {
dprintk("Error %d calling set_mac_address\n", res);
goto err_free;
}
res = netdev_set_master(slave_dev, bond_dev);
if (res) {
dprintk("Error %d calling netdev_set_master\n", res);
goto err_close;
}
/* open the slave since the application closed it */
res = dev_open(slave_dev);
if (res) {
dprintk("Openning slave %s failed\n", slave_dev->name);
goto err_restore_mac;
}
new_slave->dev = slave_dev;
slave_dev->priv_flags |= IFF_BONDING;
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* 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_unset_master;
}
}
/* If the mode USES_PRIMARY, then the new slave gets the
* master's promisc (and mc) settings only if it becomes the
* curr_active_slave, and that is taken care of later when calling
* bond_change_active()
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* set promiscuity level to new slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, 1);
}
/* set allmulti level to new slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, 1);
}
/* upload master's mc_list to new slave */
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
}
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, ETH_ALEN, 0);
}
bond_add_vlans_on_slave(bond, slave_dev);
write_lock_bh(&bond->lock);
bond_attach_slave(bond, new_slave);
new_slave->delay = 0;
new_slave->link_failure_count = 0;
bond_compute_features(bond);
new_slave->last_arp_rx = jiffies;
if (bond->params.miimon && !bond->params.use_carrier) {
link_reporting = bond_check_dev_link(bond, slave_dev, 1);
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.
*/
printk(KERN_WARNING DRV_NAME
": %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 */
printk(KERN_WARNING DRV_NAME
": %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 ||
(bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
if (bond->params.updelay) {
dprintk("Initial state of slave_dev is "
"BOND_LINK_BACK\n");
new_slave->link = BOND_LINK_BACK;
new_slave->delay = bond->params.updelay;
} else {
dprintk("Initial state of slave_dev is "
"BOND_LINK_UP\n");
new_slave->link = BOND_LINK_UP;
}
new_slave->jiffies = jiffies;
} else {
dprintk("Initial state of slave_dev is "
"BOND_LINK_DOWN\n");
new_slave->link = BOND_LINK_DOWN;
}
if (bond_update_speed_duplex(new_slave) &&
(new_slave->link != BOND_LINK_DOWN)) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: failed to get speed and duplex from %s, "
"assumed to be 100Mb/sec and Full.\n",
bond_dev->name, new_slave->dev->name);
if (bond->params.mode == BOND_MODE_8023AD) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
"support in base driver for proper aggregator "
"selection.\n", bond_dev->name);
}
}
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;
}
}
switch (bond->params.mode) {
case BOND_MODE_ACTIVEBACKUP:
bond_set_slave_inactive_flags(new_slave);
bond_select_active_slave(bond);
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);
/* if this is the first slave */
if (bond->slave_cnt == 1) {
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,
bond->params.lacp_fast);
} else {
SLAVE_AD_INFO(new_slave).id =
SLAVE_AD_INFO(new_slave->prev).id + 1;
}
bond_3ad_bind_slave(new_slave);
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
new_slave->state = BOND_STATE_ACTIVE;
if ((!bond->curr_active_slave) &&
(new_slave->link != BOND_LINK_DOWN)) {
/* first slave or no active slave yet, and this link
* is OK, so make this interface the active one
*/
bond_change_active_slave(bond, new_slave);
} else {
bond_set_slave_inactive_flags(new_slave);
}
break;
default:
dprintk("This slave is always active in trunk mode\n");
/* always active in trunk mode */
new_slave->state = BOND_STATE_ACTIVE;
/* 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) {
bond->curr_active_slave = new_slave;
}
break;
} /* switch(bond_mode) */
bond_set_carrier(bond);
write_unlock_bh(&bond->lock);
res = bond_create_slave_symlinks(bond_dev, slave_dev);
if (res)
goto err_unset_master;
printk(KERN_INFO DRV_NAME
": %s: enslaving %s as a%s interface with a%s link.\n",
bond_dev->name, slave_dev->name,
new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
/* enslave is successful */
return 0;
/* Undo stages on error */
err_unset_master:
netdev_set_master(slave_dev, NULL);
err_close:
dev_close(slave_dev);
err_restore_mac:
memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
err_free:
kfree(new_slave);
err_undo_flags:
bond_dev->features = old_features;
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.
*
* 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.
*/
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
struct sockaddr addr;
int mac_addr_differ;
/* slave is not a slave or master is not master of this slave */
if (!(slave_dev->flags & IFF_SLAVE) ||
(slave_dev->master != bond_dev)) {
printk(KERN_ERR DRV_NAME
": %s: Error: cannot release %s.\n",
bond_dev->name, slave_dev->name);
return -EINVAL;
}
write_lock_bh(&bond->lock);
slave = bond_get_slave_by_dev(bond, slave_dev);
if (!slave) {
/* not a slave of this bond */
printk(KERN_INFO DRV_NAME
": %s: %s not enslaved\n",
bond_dev->name, slave_dev->name);
write_unlock_bh(&bond->lock);
return -EINVAL;
}
mac_addr_differ = memcmp(bond_dev->dev_addr,
slave->perm_hwaddr,
ETH_ALEN);
if (!mac_addr_differ && (bond->slave_cnt > 1)) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: the permanent HWaddr of %s "
"- %02X:%02X:%02X:%02X:%02X:%02X - 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[0],
slave->perm_hwaddr[1],
slave->perm_hwaddr[2],
slave->perm_hwaddr[3],
slave->perm_hwaddr[4],
slave->perm_hwaddr[5],
bond_dev->name,
slave_dev->name);
}
/* Inform AD package of unbinding of slave. */
if (bond->params.mode == BOND_MODE_8023AD) {
/* must be called before the slave is
* detached from the list
*/
bond_3ad_unbind_slave(slave);
}
printk(KERN_INFO DRV_NAME
": %s: releasing %s interface %s\n",
bond_dev->name,
(slave->state == BOND_STATE_ACTIVE)
? "active" : "backup",
slave_dev->name);
oldcurrent = bond->curr_active_slave;
bond->current_arp_slave = NULL;
/* release the slave from its bond */
bond_detach_slave(bond, slave);
bond_compute_features(bond);
if (bond->primary_slave == slave) {
bond->primary_slave = NULL;
}
if (oldcurrent == slave) {
bond_change_active_slave(bond, NULL);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* 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 (oldcurrent == slave)
bond_select_active_slave(bond);
if (bond->slave_cnt == 0) {
bond_set_carrier(bond);
/* if the last slave was removed, zero the mac address
* of the master so it will be set by the application
* to the mac address of the first slave
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
if (list_empty(&bond->vlan_list)) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
} else {
printk(KERN_WARNING DRV_NAME
": %s: Warning: clearing HW address of %s while it "
"still has VLANs.\n",
bond_dev->name, bond_dev->name);
printk(KERN_WARNING DRV_NAME
": %s: When re-adding slaves, make sure the bond's "
"HW address matches its VLANs'.\n",
bond_dev->name);
}
} else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
!bond_has_challenged_slaves(bond)) {
printk(KERN_INFO DRV_NAME
": %s: last VLAN challenged slave %s "
"left bond %s. VLAN blocking is removed\n",
bond_dev->name, slave_dev->name, bond_dev->name);
bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
}
write_unlock_bh(&bond->lock);
/* must do this from outside any spinlocks */
bond_destroy_slave_symlinks(bond_dev, slave_dev);
bond_del_vlans_from_slave(bond, slave_dev);
/* If the mode USES_PRIMARY, then we should only remove its
* promisc and mc settings if it was the curr_active_slave, but that was
* already taken care of above when we detached the slave
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* unset promiscuity level from slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, -1);
}
/* unset allmulti level from slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, -1);
}
/* flush master's mc_list from slave */
bond_mc_list_flush(bond_dev, slave_dev);
}
netdev_set_master(slave_dev, NULL);
/* close slave before restoring its mac address */
dev_close(slave_dev);
/* restore original ("permanent") mac address */
memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
IFF_SLAVE_INACTIVE | IFF_BONDING |
IFF_SLAVE_NEEDARP);
kfree(slave);
return 0; /* deletion OK */
}
/*
* This function releases all slaves.
*/
static int bond_release_all(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
struct net_device *slave_dev;
struct sockaddr addr;
write_lock_bh(&bond->lock);
netif_carrier_off(bond_dev);
if (bond->slave_cnt == 0) {
goto out;
}
bond->current_arp_slave = NULL;
bond->primary_slave = NULL;
bond_change_active_slave(bond, NULL);
while ((slave = bond->first_slave) != NULL) {
/* Inform AD package of unbinding of slave
* before slave is detached from the list.
*/
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_unbind_slave(slave);
}
slave_dev = slave->dev;
bond_detach_slave(bond, slave);
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* must be called only after the slave
* has been detached from the list
*/
bond_alb_deinit_slave(bond, slave);
}
bond_compute_features(bond);
/* now that the slave is detached, unlock and perform
* all the undo steps that should not be called from
* within a lock.
*/
write_unlock_bh(&bond->lock);
bond_destroy_slave_symlinks(bond_dev, slave_dev);
bond_del_vlans_from_slave(bond, slave_dev);
/* If the mode USES_PRIMARY, then we should only remove its
* promisc and mc settings if it was the curr_active_slave, but that was
* already taken care of above when we detached the slave
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* unset promiscuity level from slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, -1);
}
/* unset allmulti level from slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, -1);
}
/* flush master's mc_list from slave */
bond_mc_list_flush(bond_dev, slave_dev);
}
netdev_set_master(slave_dev, NULL);
/* close slave before restoring its mac address */
dev_close(slave_dev);
/* restore original ("permanent") mac address*/
memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
IFF_SLAVE_INACTIVE);
kfree(slave);
/* re-acquire the lock before getting the next slave */
write_lock_bh(&bond->lock);
}
/* zero the mac address of the master so it will be
* set by the application to the mac address of the
* first slave
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
if (list_empty(&bond->vlan_list)) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
} else {
printk(KERN_WARNING DRV_NAME
": %s: Warning: clearing HW address of %s while it "
"still has VLANs.\n",
bond_dev->name, bond_dev->name);
printk(KERN_WARNING DRV_NAME
": %s: When re-adding slaves, make sure the bond's "
"HW address matches its VLANs'.\n",
bond_dev->name);
}
printk(KERN_INFO DRV_NAME
": %s: released all slaves\n",
bond_dev->name);
out:
write_unlock_bh(&bond->lock);
return 0;
}
/*
* This function changes the active slave to slave <slave_dev>.
* It returns -EINVAL in the following cases.
* - <slave_dev> is not found in the list.
* - There is not active slave now.
* - <slave_dev> is already active.
* - The link state of <slave_dev> is not BOND_LINK_UP.
* - <slave_dev> is not running.
* In these cases, this fuction does nothing.
* In the other cases, currnt_slave pointer is changed and 0 is returned.
*/
static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *old_active = NULL;
struct slave *new_active = NULL;
int res = 0;
if (!USES_PRIMARY(bond->params.mode)) {
return -EINVAL;
}
/* Verify that master_dev is indeed the master of slave_dev */
if (!(slave_dev->flags & IFF_SLAVE) ||
(slave_dev->master != bond_dev)) {
return -EINVAL;
}
write_lock_bh(&bond->lock);
old_active = bond->curr_active_slave;
new_active = bond_get_slave_by_dev(bond, slave_dev);
/*
* Changing to the current active: do nothing; return success.
*/
if (new_active && (new_active == old_active)) {
write_unlock_bh(&bond->lock);
return 0;
}
if ((new_active) &&
(old_active) &&
(new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
bond_change_active_slave(bond, new_active);
} else {
res = -EINVAL;
}
write_unlock_bh(&bond->lock);
return res;
}
static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
{
struct bonding *bond = bond_dev->priv;
info->bond_mode = bond->params.mode;
info->miimon = bond->params.miimon;
read_lock_bh(&bond->lock);
info->num_slaves = bond->slave_cnt;
read_unlock_bh(&bond->lock);
return 0;
}
static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i, found = 0;
if (info->slave_id < 0) {
return -ENODEV;
}
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (i == (int)info->slave_id) {
found = 1;
break;
}
}
read_unlock_bh(&bond->lock);
if (found) {
strcpy(info->slave_name, slave->dev->name);
info->link = slave->link;
info->state = slave->state;
info->link_failure_count = slave->link_failure_count;
} else {
return -ENODEV;
}
return 0;
}
/*-------------------------------- Monitoring -------------------------------*/
/* this function is called regularly to monitor each slave's link. */
void bond_mii_monitor(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
int do_failover = 0;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.miimon * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
/* we will try to read the link status of each of our slaves, and
* set their IFF_RUNNING flag appropriately. For each slave not
* supporting MII status, we won't do anything so that a user-space
* program could monitor the link itself if needed.
*/
read_lock(&bond->curr_slave_lock);
oldcurrent = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
int link_state;
u16 old_speed = slave->speed;
u8 old_duplex = slave->duplex;
link_state = bond_check_dev_link(bond, slave_dev, 0);
switch (slave->link) {
case BOND_LINK_UP: /* the link was up */
if (link_state == BMSR_LSTATUS) {
/* link stays up, nothing more to do */
break;
} else { /* link going down */
slave->link = BOND_LINK_FAIL;
slave->delay = bond->params.downdelay;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
if (bond->params.downdelay) {
printk(KERN_INFO DRV_NAME
": %s: link status down for %s "
"interface %s, disabling it in "
"%d ms.\n",
bond_dev->name,
IS_UP(slave_dev)
? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
? ((slave == oldcurrent)
? "active " : "backup ")
: "")
: "idle ",
slave_dev->name,
bond->params.downdelay * bond->params.miimon);
}
}
/* no break ! fall through the BOND_LINK_FAIL test to
ensure proper action to be taken
*/
case BOND_LINK_FAIL: /* the link has just gone down */
if (link_state != BMSR_LSTATUS) {
/* link stays down */
if (slave->delay <= 0) {
/* link down for too long time */
slave->link = BOND_LINK_DOWN;
/* in active/backup mode, we must
* completely disable this interface
*/
if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
(bond->params.mode == BOND_MODE_8023AD)) {
bond_set_slave_inactive_flags(slave);
}
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"down for interface %s, "
"disabling it\n",
bond_dev->name,
slave_dev->name);
/* notify ad that the link status has changed */
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
}
if (slave == oldcurrent) {
do_failover = 1;
}
} else {
slave->delay--;
}
} else {
/* link up again */
slave->link = BOND_LINK_UP;
slave->jiffies = jiffies;
printk(KERN_INFO DRV_NAME
": %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);
}
break;
case BOND_LINK_DOWN: /* the link was down */
if (link_state != BMSR_LSTATUS) {
/* the link stays down, nothing more to do */
break;
} else { /* link going up */
slave->link = BOND_LINK_BACK;
slave->delay = bond->params.updelay;
if (bond->params.updelay) {
/* if updelay == 0, no need to
advertise about a 0 ms delay */
printk(KERN_INFO DRV_NAME
": %s: link status up for "
"interface %s, enabling it "
"in %d ms.\n",
bond_dev->name,
slave_dev->name,
bond->params.updelay * bond->params.miimon);
}
}
/* no break ! fall through the BOND_LINK_BACK state in
case there's something to do.
*/
case BOND_LINK_BACK: /* the link has just come back */
if (link_state != BMSR_LSTATUS) {
/* link down again */
slave->link = BOND_LINK_DOWN;
printk(KERN_INFO DRV_NAME
": %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);
} else {
/* link stays up */
if (slave->delay == 0) {
/* now the link has been up for long time enough */
slave->link = BOND_LINK_UP;
slave->jiffies = jiffies;
if (bond->params.mode == BOND_MODE_8023AD) {
/* prevent it from being the active one */
slave->state = BOND_STATE_BACKUP;
} else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/* make it immediately active */
slave->state = BOND_STATE_ACTIVE;
} else if (slave != bond->primary_slave) {
/* prevent it from being the active one */
slave->state = BOND_STATE_BACKUP;
}
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"up for interface %s.\n",
bond_dev->name,
slave_dev->name);
/* 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->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
}
if ((!oldcurrent) ||
(slave == bond->primary_slave)) {
do_failover = 1;
}
} else {
slave->delay--;
}
}
break;
default:
/* Should not happen */
printk(KERN_ERR DRV_NAME
": %s: Error: %s Illegal value (link=%d)\n",
bond_dev->name,
slave->dev->name,
slave->link);
goto out;
} /* end of switch (slave->link) */
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);
}
}
} /* end of for */
if (do_failover) {
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock(&bond->curr_slave_lock);
} else
bond_set_carrier(bond);
re_arm:
if (bond->params.miimon) {
mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
}
out:
read_unlock(&bond->lock);
}
static u32 bond_glean_dev_ip(struct net_device *dev)
{
struct in_device *idev;
struct in_ifaddr *ifa;
__be32 addr = 0;
if (!dev)
return 0;
rcu_read_lock();
idev = __in_dev_get_rcu(dev);
if (!idev)
goto out;
ifa = idev->ifa_list;
if (!ifa)
goto out;
addr = ifa->ifa_local;
out:
rcu_read_unlock();
return addr;
}
static int bond_has_ip(struct bonding *bond)
{
struct vlan_entry *vlan, *vlan_next;
if (bond->master_ip)
return 1;
if (list_empty(&bond->vlan_list))
return 0;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
if (vlan->vlan_ip)
return 1;
}
return 0;
}
static int bond_has_this_ip(struct bonding *bond, u32 ip)
{
struct vlan_entry *vlan, *vlan_next;
if (ip == bond->master_ip)
return 1;
if (list_empty(&bond->vlan_list))
return 0;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
if (ip == vlan->vlan_ip)
return 1;
}
return 0;
}
/*
* We go to the (large) trouble of VLAN tagging ARP frames because
* switches in VLAN mode (especially if ports are configured as
* "native" to a VLAN) might not pass non-tagged frames.
*/
static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
{
struct sk_buff *skb;
dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
slave_dev->name, dest_ip, src_ip, vlan_id);
skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
NULL, slave_dev->dev_addr, NULL);
if (!skb) {
printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
return;
}
if (vlan_id) {
skb = vlan_put_tag(skb, vlan_id);
if (!skb) {
printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
return;
}
}
arp_xmit(skb);
}
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
int i, vlan_id, rv;
u32 *targets = bond->params.arp_targets;
struct vlan_entry *vlan, *vlan_next;
struct net_device *vlan_dev;
struct flowi fl;
struct rtable *rt;
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
if (!targets[i])
continue;
dprintk("basa: target %x\n", targets[i]);
if (list_empty(&bond->vlan_list)) {
dprintk("basa: empty vlan: arp_send\n");
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
bond->master_ip, 0);
continue;
}
/*
* If VLANs are configured, we do a route lookup to
* determine which VLAN interface would be used, so we
* can tag the ARP with the proper VLAN tag.
*/
memset(&fl, 0, sizeof(fl));
fl.fl4_dst = targets[i];
fl.fl4_tos = RTO_ONLINK;
rv = ip_route_output_key(&rt, &fl);
if (rv) {
if (net_ratelimit()) {
printk(KERN_WARNING DRV_NAME
": %s: no route to arp_ip_target %u.%u.%u.%u\n",
bond->dev->name, NIPQUAD(fl.fl4_dst));
}
continue;
}
/*
* This target is not on a VLAN
*/
if (rt->u.dst.dev == bond->dev) {
ip_rt_put(rt);
dprintk("basa: rtdev == bond->dev: arp_send\n");
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
bond->master_ip, 0);
continue;
}
vlan_id = 0;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
if (vlan_dev == rt->u.dst.dev) {
vlan_id = vlan->vlan_id;
dprintk("basa: vlan match on %s %d\n",
vlan_dev->name, vlan_id);
break;
}
}
if (vlan_id) {
ip_rt_put(rt);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
vlan->vlan_ip, vlan_id);
continue;
}
if (net_ratelimit()) {
printk(KERN_WARNING DRV_NAME
": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
bond->dev->name, NIPQUAD(fl.fl4_dst),
rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
}
ip_rt_put(rt);
}
}
/*
* Kick out a gratuitous ARP for an IP on the bonding master plus one
* for each VLAN above us.
*/
static void bond_send_gratuitous_arp(struct bonding *bond)
{
struct slave *slave = bond->curr_active_slave;
struct vlan_entry *vlan;
struct net_device *vlan_dev;
dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
slave ? slave->dev->name : "NULL");
if (!slave)
return;
if (bond->master_ip) {
bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
bond->master_ip, 0);
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
if (vlan->vlan_ip) {
bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
vlan->vlan_ip, vlan->vlan_id);
}
}
}
static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
{
int i;
u32 *targets = bond->params.arp_targets;
targets = bond->params.arp_targets;
for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
"%u.%u.%u.%u bhti(tip) %d\n",
NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
bond_has_this_ip(bond, tip));
if (sip == targets[i]) {
if (bond_has_this_ip(bond, tip))
slave->last_arp_rx = jiffies;
return;
}
}
}
static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
struct arphdr *arp;
struct slave *slave;
struct bonding *bond;
unsigned char *arp_ptr;
u32 sip, tip;
if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
goto out;
bond = dev->priv;
read_lock(&bond->lock);
dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
bond->dev->name, skb->dev ? skb->dev->name : "NULL",
orig_dev ? orig_dev->name : "NULL");
slave = bond_get_slave_by_dev(bond, orig_dev);
if (!slave || !slave_do_arp_validate(bond, slave))
goto out_unlock;
/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
(2 * dev->addr_len) +
(2 * sizeof(u32)))))
goto out_unlock;
arp = arp_hdr(skb);
if (arp->ar_hln != dev->addr_len ||
skb->pkt_type == PACKET_OTHERHOST ||
skb->pkt_type == PACKET_LOOPBACK ||
arp->ar_hrd != htons(ARPHRD_ETHER) ||
arp->ar_pro != htons(ETH_P_IP) ||
arp->ar_pln != 4)
goto out_unlock;
arp_ptr = (unsigned char *)(arp + 1);
arp_ptr += dev->addr_len;
memcpy(&sip, arp_ptr, 4);
arp_ptr += 4 + dev->addr_len;
memcpy(&tip, arp_ptr, 4);
dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
" tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
slave->state, bond->params.arp_validate,
slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
/*
* Backup slaves won't see the ARP reply, but do come through
* here for each ARP probe (so we swap the sip/tip to validate
* the probe). In a "redundant switch, common router" type of
* configuration, the ARP probe will (hopefully) travel from
* the active, through one switch, the router, then the other
* switch before reaching the backup.
*/
if (slave->state == BOND_STATE_ACTIVE)
bond_validate_arp(bond, slave, sip, tip);
else
bond_validate_arp(bond, slave, tip, sip);
out_unlock:
read_unlock(&bond->lock);
out:
dev_kfree_skb(skb);
return NET_RX_SUCCESS;
}
/*
* this function is called regularly to monitor each slave's link
* ensuring that traffic is being sent and received when arp monitoring
* 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.
*/
void bond_loadbalance_arp_mon(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
int do_failover = 0;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
read_lock(&bond->curr_slave_lock);
oldcurrent = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
/* 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->jiffies 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(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
slave->link = BOND_LINK_UP;
slave->state = BOND_STATE_ACTIVE;
/* 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) {
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"up for interface %s, ",
bond_dev->name,
slave->dev->name);
do_failover = 1;
} else {
printk(KERN_INFO DRV_NAME
": %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 (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
bond_has_ip(bond))) {
slave->link = BOND_LINK_DOWN;
slave->state = BOND_STATE_BACKUP;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
printk(KERN_INFO DRV_NAME
": %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);
}
}
if (do_failover) {
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock(&bond->curr_slave_lock);
}
re_arm:
if (bond->params.arp_interval) {
mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
}
out:
read_unlock(&bond->lock);
}
/*
* When using arp monitoring in active-backup mode, this function is
* called to determine if any backup slaves have went down or a new
* current slave needs to be found.
* The backup slaves never generate traffic, they are considered up by merely
* receiving traffic. If the current slave goes down, each backup slave will
* be given the opportunity to tx/rx an arp before being taken down - this
* prevents all slaves from being taken down due to the current slave not
* sending any traffic for the backups to receive. The arps are not necessarily
* necessary, any tx and rx traffic will keep the current slave up. While any
* rx traffic will keep the backup slaves up, the current slave is responsible
* for generating traffic to keep them up regardless of any other traffic they
* may have received.
* see loadbalance_arp_monitor for arp monitoring in load balancing mode
*/
void bond_activebackup_arp_mon(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
/* determine if any slave has come up or any backup slave has
* gone down
* TODO: what about up/down delay in arp mode? it wasn't here before
* so it can wait
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if ((jiffies - slave_last_rx(bond, slave)) <=
delta_in_ticks) {
slave->link = BOND_LINK_UP;
write_lock(&bond->curr_slave_lock);
if ((!bond->curr_active_slave) &&
((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
bond_change_active_slave(bond, slave);
bond->current_arp_slave = NULL;
} else if (bond->curr_active_slave != slave) {
/* this slave has just come up but we
* already have a current slave; this
* can also happen if bond_enslave adds
* a new slave that is up while we are
* searching for a new slave
*/
bond_set_slave_inactive_flags(slave);
bond->current_arp_slave = NULL;
}
bond_set_carrier(bond);
if (slave == bond->curr_active_slave) {
printk(KERN_INFO DRV_NAME
": %s: %s is up and now the "
"active interface\n",
bond_dev->name,
slave->dev->name);
netif_carrier_on(bond->dev);
} else {
printk(KERN_INFO DRV_NAME
": %s: backup interface %s is "
"now up\n",
bond_dev->name,
slave->dev->name);
}
write_unlock(&bond->curr_slave_lock);
}
} else {
read_lock(&bond->curr_slave_lock);
if ((slave != bond->curr_active_slave) &&
(!bond->current_arp_slave) &&
(((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
bond_has_ip(bond))) {
/* a backup slave has gone down; three times
* the delta allows the current slave to be
* taken out before the backup slave.
* 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
*/
read_unlock(&bond->curr_slave_lock);
slave->link = BOND_LINK_DOWN;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
bond_set_slave_inactive_flags(slave);
printk(KERN_INFO DRV_NAME
": %s: backup interface %s is now down\n",
bond_dev->name,
slave->dev->name);
} else {
read_unlock(&bond->curr_slave_lock);
}
}
}
read_lock(&bond->curr_slave_lock);
slave = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (slave) {
/* if we have sent traffic in the past 2*arp_intervals but
* haven't xmit and rx traffic in that time interval, select
* a different slave. slave->jiffies is only updated when
* a slave first becomes the curr_active_slave - not necessarily
* after every arp; this ensures the slave has a full 2*delta
* before being taken out. if a primary is being used, check
* if it is up and needs to take over as the curr_active_slave
*/
if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
bond_has_ip(bond))) &&
((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
slave->link = BOND_LINK_DOWN;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
printk(KERN_INFO DRV_NAME
": %s: link status down for active interface "
"%s, disabling it\n",
bond_dev->name,
slave->dev->name);
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
slave = bond->curr_active_slave;
write_unlock(&bond->curr_slave_lock);
bond->current_arp_slave = slave;
if (slave) {
slave->jiffies = jiffies;
}
} else if ((bond->primary_slave) &&
(bond->primary_slave != slave) &&
(bond->primary_slave->link == BOND_LINK_UP)) {
/* at this point, slave is the curr_active_slave */
printk(KERN_INFO DRV_NAME
": %s: changing from interface %s to primary "
"interface %s\n",
bond_dev->name,
slave->dev->name,
bond->primary_slave->dev->name);
/* primary is up so switch to it */
write_lock(&bond->curr_slave_lock);
bond_change_active_slave(bond, bond->primary_slave);
write_unlock(&bond->curr_slave_lock);
slave = bond->primary_slave;
slave->jiffies = jiffies;
} else {
bond->current_arp_slave = NULL;
}
/* the current slave must tx an arp to ensure backup slaves
* rx traffic
*/
if (slave && bond_has_ip(bond)) {
bond_arp_send_all(bond, slave);
}
}
/* 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 (!slave) {
if (!bond->current_arp_slave) {
bond->current_arp_slave = bond->first_slave;
}
if (bond->current_arp_slave) {
bond_set_slave_inactive_flags(bond->current_arp_slave);
/* search for next candidate */
bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
if (IS_UP(slave->dev)) {
slave->link = BOND_LINK_BACK;
bond_set_slave_active_flags(slave);
bond_arp_send_all(bond, slave);
slave->jiffies = jiffies;
bond->current_arp_slave = slave;
break;
}
/* 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 (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);
printk(KERN_INFO DRV_NAME
": %s: backup interface %s is "
"now down.\n",
bond_dev->name,
slave->dev->name);
}
}
}
}
re_arm:
if (bond->params.arp_interval) {
mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
}
out:
read_unlock(&bond->lock);
}
/*------------------------------ proc/seq_file-------------------------------*/
#ifdef CONFIG_PROC_FS
#define SEQ_START_TOKEN ((void *)1)
static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
{
struct bonding *bond = seq->private;
loff_t off = 0;
struct slave *slave;
int i;
/* make sure the bond won't be taken away */
read_lock(&dev_base_lock);
read_lock_bh(&bond->lock);
if (*pos == 0) {
return SEQ_START_TOKEN;
}
bond_for_each_slave(bond, slave, i) {
if (++off == *pos) {
return slave;
}
}
return NULL;
}
static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct bonding *bond = seq->private;
struct slave *slave = v;
++*pos;
if (v == SEQ_START_TOKEN) {
return bond->first_slave;
}
slave = slave->next;
return (slave == bond->first_slave) ? NULL : slave;
}
static void bond_info_seq_stop(struct seq_file *seq, void *v)
{
struct bonding *bond = seq->private;
read_unlock_bh(&bond->lock);
read_unlock(&dev_base_lock);
}
static void bond_info_show_master(struct seq_file *seq)
{
struct bonding *bond = seq->private;
struct slave *curr;
int i;
u32 target;
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
seq_printf(seq, "Bonding Mode: %s\n",
bond_mode_name(bond->params.mode));
if (bond->params.mode == BOND_MODE_XOR ||
bond->params.mode == BOND_MODE_8023AD) {
seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
xmit_hashtype_tbl[bond->params.xmit_policy].modename,
bond->params.xmit_policy);
}
if (USES_PRIMARY(bond->params.mode)) {
seq_printf(seq, "Primary Slave: %s\n",
(bond->primary_slave) ?
bond->primary_slave->dev->name : "None");
seq_printf(seq, "Currently Active Slave: %s\n",
(curr) ? curr->dev->name : "None");
}
seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
"up" : "down");
seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
seq_printf(seq, "Up Delay (ms): %d\n",
bond->params.updelay * bond->params.miimon);
seq_printf(seq, "Down Delay (ms): %d\n",
bond->params.downdelay * bond->params.miimon);
/* ARP information */
if(bond->params.arp_interval > 0) {
int printed=0;
seq_printf(seq, "ARP Polling Interval (ms): %d\n",
bond->params.arp_interval);
seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
if (!bond->params.arp_targets[i])
continue;
if (printed)
seq_printf(seq, ",");
target = ntohl(bond->params.arp_targets[i]);
seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
printed = 1;
}
seq_printf(seq, "\n");
}
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
seq_puts(seq, "\n802.3ad info\n");
seq_printf(seq, "LACP rate: %s\n",
(bond->params.lacp_fast) ? "fast" : "slow");
if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
seq_printf(seq, "bond %s has no active aggregator\n",
bond->dev->name);
} else {
seq_printf(seq, "Active Aggregator Info:\n");
seq_printf(seq, "\tAggregator ID: %d\n",
ad_info.aggregator_id);
seq_printf(seq, "\tNumber of ports: %d\n",
ad_info.ports);
seq_printf(seq, "\tActor Key: %d\n",
ad_info.actor_key);
seq_printf(seq, "\tPartner Key: %d\n",
ad_info.partner_key);
seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
ad_info.partner_system[0],
ad_info.partner_system[1],
ad_info.partner_system[2],
ad_info.partner_system[3],
ad_info.partner_system[4],
ad_info.partner_system[5]);
}
}
}
static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
{
struct bonding *bond = seq->private;
seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
seq_printf(seq, "MII Status: %s\n",
(slave->link == BOND_LINK_UP) ? "up" : "down");
seq_printf(seq, "Link Failure Count: %u\n",
slave->link_failure_count);
seq_printf(seq,
"Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
slave->perm_hwaddr[0], slave->perm_hwaddr[1],
slave->perm_hwaddr[2], slave->perm_hwaddr[3],
slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
if (bond->params.mode == BOND_MODE_8023AD) {
const struct aggregator *agg
= SLAVE_AD_INFO(slave).port.aggregator;
if (agg) {
seq_printf(seq, "Aggregator ID: %d\n",
agg->aggregator_identifier);
} else {
seq_puts(seq, "Aggregator ID: N/A\n");
}
}
}
static int bond_info_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN) {
seq_printf(seq, "%s\n", version);
bond_info_show_master(seq);
} else {
bond_info_show_slave(seq, v);
}
return 0;
}
static struct seq_operations bond_info_seq_ops = {
.start = bond_info_seq_start,
.next = bond_info_seq_next,
.stop = bond_info_seq_stop,
.show = bond_info_seq_show,
};
static int bond_info_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
struct proc_dir_entry *proc;
int res;
res = seq_open(file, &bond_info_seq_ops);
if (!res) {
/* recover the pointer buried in proc_dir_entry data */
seq = file->private_data;
proc = PDE(inode);
seq->private = proc->data;
}
return res;
}
static const struct file_operations bond_info_fops = {
.owner = THIS_MODULE,
.open = bond_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int bond_create_proc_entry(struct bonding *bond)
{
struct net_device *bond_dev = bond->dev;
if (bond_proc_dir) {
bond->proc_entry = create_proc_entry(bond_dev->name,
S_IRUGO,
bond_proc_dir);
if (bond->proc_entry == NULL) {
printk(KERN_WARNING DRV_NAME
": Warning: Cannot create /proc/net/%s/%s\n",
DRV_NAME, bond_dev->name);
} else {
bond->proc_entry->data = bond;
bond->proc_entry->proc_fops = &bond_info_fops;
bond->proc_entry->owner = THIS_MODULE;
memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
}
}
return 0;
}
static void bond_remove_proc_entry(struct bonding *bond)
{
if (bond_proc_dir && bond->proc_entry) {
remove_proc_entry(bond->proc_file_name, bond_proc_dir);
memset(bond->proc_file_name, 0, IFNAMSIZ);
bond->proc_entry = NULL;
}
}
/* Create the bonding directory under /proc/net, if doesn't exist yet.
* Caller must hold rtnl_lock.
*/
static void bond_create_proc_dir(void)
{
int len = strlen(DRV_NAME);
for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
bond_proc_dir = bond_proc_dir->next) {
if ((bond_proc_dir->namelen == len) &&
!memcmp(bond_proc_dir->name, DRV_NAME, len)) {
break;
}
}
if (!bond_proc_dir) {
bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
if (bond_proc_dir) {
bond_proc_dir->owner = THIS_MODULE;
} else {
printk(KERN_WARNING DRV_NAME
": Warning: cannot create /proc/net/%s\n",
DRV_NAME);
}
}
}
/* Destroy the bonding directory under /proc/net, if empty.
* Caller must hold rtnl_lock.
*/
static void bond_destroy_proc_dir(void)
{
struct proc_dir_entry *de;
if (!bond_proc_dir) {
return;
}
/* verify that the /proc dir is empty */
for (de = bond_proc_dir->subdir; de; de = de->next) {
/* ignore . and .. */
if (*(de->name) != '.') {
break;
}
}
if (de) {
if (bond_proc_dir->owner == THIS_MODULE) {
bond_proc_dir->owner = NULL;
}
} else {
remove_proc_entry(DRV_NAME, proc_net);
bond_proc_dir = NULL;
}
}
#endif /* CONFIG_PROC_FS */
/*-------------------------- netdev event handling --------------------------*/
/*
* Change device name
*/
static int bond_event_changename(struct bonding *bond)
{
#ifdef CONFIG_PROC_FS
bond_remove_proc_entry(bond);
bond_create_proc_entry(bond);
#endif
down_write(&(bonding_rwsem));
bond_destroy_sysfs_entry(bond);
bond_create_sysfs_entry(bond);
up_write(&(bonding_rwsem));
return NOTIFY_DONE;
}
static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
{
struct bonding *event_bond = bond_dev->priv;
switch (event) {
case NETDEV_CHANGENAME:
return bond_event_changename(event_bond);
case NETDEV_UNREGISTER:
/*
* TODO: remove a bond from the list?
*/
break;
default:
break;
}
return NOTIFY_DONE;
}
static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
{
struct net_device *bond_dev = slave_dev->master;
struct bonding *bond = bond_dev->priv;
switch (event) {
case NETDEV_UNREGISTER:
if (bond_dev) {
bond_release(bond_dev, slave_dev);
}
break;
case NETDEV_CHANGE:
/*
* TODO: is this what we get if somebody
* sets up a hierarchical bond, then rmmod's
* one of the slave bonding devices?
*/
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:
/*
* TODO: handle changing the primary's name
*/
break;
case NETDEV_FEAT_CHANGE:
bond_compute_features(bond);
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 = (struct net_device *)ptr;
dprintk("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) {
dprintk("IFF_MASTER\n");
return bond_master_netdev_event(event, event_dev);
}
if (event_dev->flags & IFF_SLAVE) {
dprintk("IFF_SLAVE\n");
return bond_slave_netdev_event(event, event_dev);
}
return NOTIFY_DONE;
}
/*
* bond_inetaddr_event: handle inetaddr notifier chain events.
*
* We keep track of device IPs primarily to use as source addresses in
* ARP monitor probes (rather than spewing out broadcasts all the time).
*
* We track one IP for the main device (if it has one), plus one per VLAN.
*/
static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct in_ifaddr *ifa = ptr;
struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
struct bonding *bond, *bond_next;
struct vlan_entry *vlan, *vlan_next;
list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
if (bond->dev == event_dev) {
switch (event) {
case NETDEV_UP:
bond->master_ip = ifa->ifa_local;
return NOTIFY_OK;
case NETDEV_DOWN:
bond->master_ip = bond_glean_dev_ip(bond->dev);
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
if (list_empty(&bond->vlan_list))
continue;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
if (vlan_dev == event_dev) {
switch (event) {
case NETDEV_UP:
vlan->vlan_ip = ifa->ifa_local;
return NOTIFY_OK;
case NETDEV_DOWN:
vlan->vlan_ip =
bond_glean_dev_ip(vlan_dev);
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
}
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier = {
.notifier_call = bond_netdev_event,
};
static struct notifier_block bond_inetaddr_notifier = {
.notifier_call = bond_inetaddr_event,
};
/*-------------------------- Packet type handling ---------------------------*/
/* register to receive lacpdus on a bond */
static void bond_register_lacpdu(struct bonding *bond)
{
struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
/* initialize packet type */
pk_type->type = PKT_TYPE_LACPDU;
pk_type->dev = bond->dev;
pk_type->func = bond_3ad_lacpdu_recv;
dev_add_pack(pk_type);
}
/* unregister to receive lacpdus on a bond */
static void bond_unregister_lacpdu(struct bonding *bond)
{
dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
}
void bond_register_arp(struct bonding *bond)
{
struct packet_type *pt = &bond->arp_mon_pt;
if (pt->type)
return;
pt->type = htons(ETH_P_ARP);
pt->dev = bond->dev;
pt->func = bond_arp_rcv;
dev_add_pack(pt);
}
void bond_unregister_arp(struct bonding *bond)
{
struct packet_type *pt = &bond->arp_mon_pt;
dev_remove_pack(pt);
pt->type = 0;
}
/*---------------------------- Hashing Policies -----------------------------*/
/*
* Hash for the output device based upon layer 3 and layer 4 data. If
* the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
* altogether not IP, mimic bond_xmit_hash_policy_l2()
*/
static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
struct iphdr *iph = ip_hdr(skb);
u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
int layer4_xor = 0;
if (skb->protocol == __constant_htons(ETH_P_IP)) {
if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
(iph->protocol == IPPROTO_TCP ||
iph->protocol == IPPROTO_UDP)) {
layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
}
return (layer4_xor ^
((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
}
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*
* Hash for the output device based upon layer 2 data
*/
static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*-------------------------- Device entry points ----------------------------*/
static int bond_open(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct timer_list *mii_timer = &bond->mii_timer;
struct timer_list *arp_timer = &bond->arp_timer;
bond->kill_timers = 0;
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
/* bond_alb_initialize must be called before the timer
* is started.
*/
if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
/* something went wrong - fail the open operation */
return -1;
}
init_timer(alb_timer);
alb_timer->expires = jiffies + 1;
alb_timer->data = (unsigned long)bond;
alb_timer->function = (void *)&bond_alb_monitor;
add_timer(alb_timer);
}
if (bond->params.miimon) { /* link check interval, in milliseconds. */
init_timer(mii_timer);
mii_timer->expires = jiffies + 1;
mii_timer->data = (unsigned long)bond_dev;
mii_timer->function = (void *)&bond_mii_monitor;
add_timer(mii_timer);
}
if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
init_timer(arp_timer);
arp_timer->expires = jiffies + 1;
arp_timer->data = (unsigned long)bond_dev;
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
arp_timer->function = (void *)&bond_activebackup_arp_mon;
} else {
arp_timer->function = (void *)&bond_loadbalance_arp_mon;
}
if (bond->params.arp_validate)
bond_register_arp(bond);
add_timer(arp_timer);
}
if (bond->params.mode == BOND_MODE_8023AD) {
struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
init_timer(ad_timer);
ad_timer->expires = jiffies + 1;
ad_timer->data = (unsigned long)bond;
ad_timer->function = (void *)&bond_3ad_state_machine_handler;
add_timer(ad_timer);
/* register to receive LACPDUs */
bond_register_lacpdu(bond);
}
return 0;
}
static int bond_close(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
if (bond->params.mode == BOND_MODE_8023AD) {
/* Unregister the receive of LACPDUs */
bond_unregister_lacpdu(bond);
}
if (bond->params.arp_validate)
bond_unregister_arp(bond);
write_lock_bh(&bond->lock);
/* signal timers not to re-arm */
bond->kill_timers = 1;
write_unlock_bh(&bond->lock);
/* del_timer_sync must run without holding the bond->lock
* because a running timer might be trying to hold it too
*/
if (bond->params.miimon) { /* link check interval, in milliseconds. */
del_timer_sync(&bond->mii_timer);
}
if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
del_timer_sync(&bond->arp_timer);
}
switch (bond->params.mode) {
case BOND_MODE_8023AD:
del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
break;
default:
break;
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* Must be called only after all
* slaves have been released
*/
bond_alb_deinitialize(bond);
}
return 0;
}
static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct net_device_stats *stats = &(bond->stats), *sstats;
struct slave *slave;
int i;
memset(stats, 0, sizeof(struct net_device_stats));
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
sstats = slave->dev->get_stats(slave->dev);
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 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;
int res = 0;
dprintk("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) {
struct bonding *bond = bond_dev->priv;
mii->val_out = 0;
read_lock_bh(&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_bh(&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) {
if (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) {
if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
return -EFAULT;
}
}
return res;
default:
/* Go on */
break;
}
if (!capable(CAP_NET_ADMIN)) {
return -EPERM;
}
down_write(&(bonding_rwsem));
slave_dev = dev_get_by_name(ifr->ifr_slave);
dprintk("slave_dev=%p: \n", slave_dev);
if (!slave_dev) {
res = -ENODEV;
} else {
dprintk("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:
res = bond_sethwaddr(bond_dev, slave_dev);
break;
case BOND_CHANGE_ACTIVE_OLD:
case SIOCBONDCHANGEACTIVE:
res = bond_ioctl_change_active(bond_dev, slave_dev);
break;
default:
res = -EOPNOTSUPP;
}
dev_put(slave_dev);
}
up_write(&(bonding_rwsem));
return res;
}
static void bond_set_multicast_list(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct dev_mc_list *dmi;
write_lock_bh(&bond->lock);
/*
* Do promisc before checking multicast_mode
*/
if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
bond_set_promiscuity(bond, 1);
}
if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
bond_set_promiscuity(bond, -1);
}
/* set allmulti flag to slaves */
if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
bond_set_allmulti(bond, 1);
}
if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
bond_set_allmulti(bond, -1);
}
bond->flags = bond_dev->flags;
/* looking for addresses to add to slaves' mc list */
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
}
}
/* looking for addresses to delete from slaves' list */
for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
}
}
/* save master's multicast list */
bond_mc_list_destroy(bond);
bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
write_unlock_bh(&bond->lock);
}
/*
* 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 = bond_dev->priv;
struct slave *slave, *stop_at;
int res = 0;
int i;
dprintk("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, i) {
dprintk("s %p s->p %p c_m %p\n", slave,
slave->prev, slave->dev->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.
*/
dprintk("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 */
stop_at = slave;
bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
int tmp_res;
tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
if (tmp_res) {
dprintk("unwind err %d dev %s\n", tmp_res,
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 = bond_dev->priv;
struct sockaddr *sa = addr, tmp_sa;
struct slave *slave, *stop_at;
int res = 0;
int i;
dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
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, i) {
dprintk("slave %p %s\n", slave, slave->dev->name);
if (slave->dev->set_mac_address == NULL) {
res = -EOPNOTSUPP;
dprintk("EOPNOTSUPP %s\n", slave->dev->name);
goto unwind;
}
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...
*/
dprintk("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 */
stop_at = slave;
bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
int tmp_res;
tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
if (tmp_res) {
dprintk("unwind err %d dev %s\n", tmp_res,
slave->dev->name);
}
}
return res;
}
static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *start_at;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
read_lock(&bond->curr_slave_lock);
slave = start_at = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (!slave) {
goto out;
}
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
write_lock(&bond->curr_slave_lock);
bond->curr_active_slave = slave->next;
write_unlock(&bond->curr_slave_lock);
break;
}
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->lock);
return 0;
}
/*
* 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 = bond_dev->priv;
int res = 1;
read_lock(&bond->lock);
read_lock(&bond->curr_slave_lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
if (!bond->curr_active_slave)
goto out;
res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->curr_slave_lock);
read_unlock(&bond->lock);
return 0;
}
/*
* 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 = bond_dev->priv;
struct slave *slave, *start_at;
int slave_no;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
bond_for_each_slave(bond, slave, i) {
slave_no--;
if (slave_no < 0) {
break;
}
}
start_at = slave;
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
break;
}
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->lock);
return 0;
}
/*
* 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 = bond_dev->priv;
struct slave *slave, *start_at;
struct net_device *tx_dev = NULL;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
read_lock(&bond->curr_slave_lock);
start_at = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (!start_at) {
goto out;
}
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
if (tx_dev) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2) {
printk(KERN_ERR DRV_NAME
": %s: Error: bond_xmit_broadcast(): "
"skb_clone() failed\n",
bond_dev->name);
continue;
}
res = bond_dev_queue_xmit(bond, skb2, tx_dev);
if (res) {
dev_kfree_skb(skb2);
continue;
}
}
tx_dev = slave->dev;
}
}
if (tx_dev) {
res = bond_dev_queue_xmit(bond, skb, tx_dev);
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
/* frame sent to all suitable interfaces */
read_unlock(&bond->lock);
return 0;
}
/*------------------------- Device initialization ---------------------------*/
/*
* set bond mode specific net device operations
*/
void bond_set_mode_ops(struct bonding *bond, int mode)
{
struct net_device *bond_dev = bond->dev;
switch (mode) {
case BOND_MODE_ROUNDROBIN:
bond_dev->hard_start_xmit = bond_xmit_roundrobin;
break;
case BOND_MODE_ACTIVEBACKUP:
bond_dev->hard_start_xmit = bond_xmit_activebackup;
break;
case BOND_MODE_XOR:
bond_dev->hard_start_xmit = bond_xmit_xor;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
break;
case BOND_MODE_BROADCAST:
bond_dev->hard_start_xmit = bond_xmit_broadcast;
break;
case BOND_MODE_8023AD:
bond_set_master_3ad_flags(bond);
bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
break;
case BOND_MODE_ALB:
bond_set_master_alb_flags(bond);
/* FALLTHRU */
case BOND_MODE_TLB:
bond_dev->hard_start_xmit = bond_alb_xmit;
bond_dev->set_mac_address = bond_alb_set_mac_address;
break;
default:
/* Should never happen, mode already checked */
printk(KERN_ERR DRV_NAME
": %s: Error: Unknown bonding mode %d\n",
bond_dev->name,
mode);
break;
}
}
static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
struct ethtool_drvinfo *drvinfo)
{
strncpy(drvinfo->driver, DRV_NAME, 32);
strncpy(drvinfo->version, DRV_VERSION, 32);
snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
}
static const struct ethtool_ops bond_ethtool_ops = {
.get_tx_csum = ethtool_op_get_tx_csum,
.get_tso = ethtool_op_get_tso,
.get_ufo = ethtool_op_get_ufo,
.get_sg = ethtool_op_get_sg,
.get_drvinfo = bond_ethtool_get_drvinfo,
};
/*
* Does not allocate but creates a /proc entry.
* Allowed to fail.
*/
static int bond_init(struct net_device *bond_dev, struct bond_params *params)
{
struct bonding *bond = bond_dev->priv;
dprintk("Begin bond_init for %s\n", bond_dev->name);
/* initialize rwlocks */
rwlock_init(&bond->lock);
rwlock_init(&bond->curr_slave_lock);
bond->params = *params; /* copy params struct */
/* Initialize pointers */
bond->first_slave = NULL;
bond->curr_active_slave = NULL;
bond->current_arp_slave = NULL;
bond->primary_slave = NULL;
bond->dev = bond_dev;
INIT_LIST_HEAD(&bond->vlan_list);
/* Initialize the device entry points */
bond_dev->open = bond_open;
bond_dev->stop = bond_close;
bond_dev->get_stats = bond_get_stats;
bond_dev->do_ioctl = bond_do_ioctl;
bond_dev->ethtool_ops = &bond_ethtool_ops;
bond_dev->set_multicast_list = bond_set_multicast_list;
bond_dev->change_mtu = bond_change_mtu;
bond_dev->set_mac_address = bond_set_mac_address;
bond_set_mode_ops(bond, bond->params.mode);
bond_dev->destructor = free_netdev;
/* Initialize the device options */
bond_dev->tx_queue_len = 0;
bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
bond_dev->priv_flags |= IFF_BONDING;
/* 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
*/
bond_dev->vlan_rx_register = bond_vlan_rx_register;
bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
bond_dev->features |= (NETIF_F_HW_VLAN_TX |
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER);
#ifdef CONFIG_PROC_FS
bond_create_proc_entry(bond);
#endif
list_add_tail(&bond->bond_list, &bond_dev_list);
return 0;
}
/* De-initialize device specific data.
* Caller must hold rtnl_lock.
*/
void bond_deinit(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
list_del(&bond->bond_list);
#ifdef CONFIG_PROC_FS
bond_remove_proc_entry(bond);
#endif
}
/* Unregister and free all bond devices.
* Caller must hold rtnl_lock.
*/
static void bond_free_all(void)
{
struct bonding *bond, *nxt;
list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
struct net_device *bond_dev = bond->dev;
bond_mc_list_destroy(bond);
/* Release the bonded slaves */
bond_release_all(bond_dev);
bond_deinit(bond_dev);
unregister_netdevice(bond_dev);
}
#ifdef CONFIG_PROC_FS
bond_destroy_proc_dir();
#endif
}
/*------------------------- Module initialization ---------------------------*/
/*
* Convert string input module parms. Accept either the
* number of the mode or its string name.
*/
int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
{
int i;
for (i = 0; tbl[i].modename; i++) {
if ((isdigit(*mode_arg) &&
tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
(strncmp(mode_arg, tbl[i].modename,
strlen(tbl[i].modename)) == 0)) {
return tbl[i].mode;
}
}
return -1;
}
static int bond_check_params(struct bond_params *params)
{
int arp_validate_value;
/*
* Convert string parameters.
*/
if (mode) {
bond_mode = bond_parse_parm(mode, bond_mode_tbl);
if (bond_mode == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid bonding mode \"%s\"\n",
mode == NULL ? "NULL" : mode);
return -EINVAL;
}
}
if (xmit_hash_policy) {
if ((bond_mode != BOND_MODE_XOR) &&
(bond_mode != BOND_MODE_8023AD)) {
printk(KERN_INFO DRV_NAME
": xor_mode param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
xmit_hashtype = bond_parse_parm(xmit_hash_policy,
xmit_hashtype_tbl);
if (xmit_hashtype == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid xmit_hash_policy \"%s\"\n",
xmit_hash_policy == NULL ? "NULL" :
xmit_hash_policy);
return -EINVAL;
}
}
}
if (lacp_rate) {
if (bond_mode != BOND_MODE_8023AD) {
printk(KERN_INFO DRV_NAME
": lacp_rate param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
if (lacp_fast == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid lacp rate \"%s\"\n",
lacp_rate == NULL ? "NULL" : lacp_rate);
return -EINVAL;
}
}
}
if (max_bonds < 1 || max_bonds > INT_MAX) {
printk(KERN_WARNING DRV_NAME
": Warning: max_bonds (%d) not in range %d-%d, so it "
"was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
max_bonds = BOND_DEFAULT_MAX_BONDS;
}
if (miimon < 0) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon module parameter (%d), "
"not in range 0-%d, so it was reset to %d\n",
miimon, INT_MAX, BOND_LINK_MON_INTERV);
miimon = BOND_LINK_MON_INTERV;
}
if (updelay < 0) {
printk(KERN_WARNING DRV_NAME
": 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) {
printk(KERN_WARNING DRV_NAME
": 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)) {
printk(KERN_WARNING DRV_NAME
": Warning: use_carrier module parameter (%d), "
"not of valid value (0/1), so it was set to 1\n",
use_carrier);
use_carrier = 1;
}
/* reset values for 802.3ad */
if (bond_mode == BOND_MODE_8023AD) {
if (!miimon) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon must be specified, "
"otherwise bonding will not detect link "
"failure, speed and duplex which are "
"essential for 802.3ad operation\n");
printk(KERN_WARNING "Forcing miimon to 100msec\n");
miimon = 100;
}
}
/* reset values for TLB/ALB */
if ((bond_mode == BOND_MODE_TLB) ||
(bond_mode == BOND_MODE_ALB)) {
if (!miimon) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon must be specified, "
"otherwise bonding will not detect link "
"failure and link speed which are essential "
"for TLB/ALB load balancing\n");
printk(KERN_WARNING "Forcing miimon to 100msec\n");
miimon = 100;
}
}
if (bond_mode == BOND_MODE_ALB) {
printk(KERN_NOTICE DRV_NAME
": 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...
*/
printk(KERN_WARNING DRV_NAME
": 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) {
printk(KERN_WARNING DRV_NAME
": 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) {
printk(KERN_WARNING DRV_NAME
": 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) {
printk(KERN_WARNING DRV_NAME
": 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) {
printk(KERN_WARNING DRV_NAME
": Warning: arp_interval module parameter (%d) "
", not in range 0-%d, so it was reset to %d\n",
arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
arp_interval = BOND_LINK_ARP_INTERV;
}
for (arp_ip_count = 0;
(arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
arp_ip_count++) {
/* not complete check, but should be good enough to
catch mistakes */
if (!isdigit(arp_ip_target[arp_ip_count][0])) {
printk(KERN_WARNING DRV_NAME
": Warning: bad arp_ip_target module parameter "
"(%s), ARP monitoring will not be performed\n",
arp_ip_target[arp_ip_count]);
arp_interval = 0;
} else {
u32 ip = in_aton(arp_ip_target[arp_ip_count]);
arp_target[arp_ip_count] = ip;
}
}
if (arp_interval && !arp_ip_count) {
/* don't allow arping if no arp_ip_target given... */
printk(KERN_WARNING DRV_NAME
": 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 (bond_mode != BOND_MODE_ACTIVEBACKUP) {
printk(KERN_ERR DRV_NAME
": arp_validate only supported in active-backup mode\n");
return -EINVAL;
}
if (!arp_interval) {
printk(KERN_ERR DRV_NAME
": arp_validate requires arp_interval\n");
return -EINVAL;
}
arp_validate_value = bond_parse_parm(arp_validate,
arp_validate_tbl);
if (arp_validate_value == -1) {
printk(KERN_ERR DRV_NAME
": Error: invalid arp_validate \"%s\"\n",
arp_validate == NULL ? "NULL" : arp_validate);
return -EINVAL;
}
} else
arp_validate_value = 0;
if (miimon) {
printk(KERN_INFO DRV_NAME
": MII link monitoring set to %d ms\n",
miimon);
} else if (arp_interval) {
int i;
printk(KERN_INFO DRV_NAME
": ARP monitoring set to %d ms, validate %s, with %d target(s):",
arp_interval,
arp_validate_tbl[arp_validate_value].modename,
arp_ip_count);
for (i = 0; i < arp_ip_count; i++)
printk (" %s", arp_ip_target[i]);
printk("\n");
} else {
/* miimon and arp_interval not set, we need one so things
* work as expected, see bonding.txt for details
*/
printk(KERN_WARNING DRV_NAME
": 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
*/
printk(KERN_WARNING DRV_NAME
": Warning: %s primary device specified but has no "
"effect in %s mode\n",
primary, bond_mode_name(bond_mode));
primary = NULL;
}
/* fill params struct with the proper values */
params->mode = bond_mode;
params->xmit_policy = xmit_hashtype;
params->miimon = miimon;
params->arp_interval = arp_interval;
params->arp_validate = arp_validate_value;
params->updelay = updelay;
params->downdelay = downdelay;
params->use_carrier = use_carrier;
params->lacp_fast = lacp_fast;
params->primary[0] = 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;
/* 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(char *name, struct bond_params *params, struct bonding **newbond)
{
struct net_device *bond_dev;
int res;
rtnl_lock();
bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
ether_setup);
if (!bond_dev) {
printk(KERN_ERR DRV_NAME
": %s: eek! can't alloc netdev!\n",
name);
res = -ENOMEM;
goto out_rtnl;
}
if (!name) {
res = dev_alloc_name(bond_dev, "bond%d");
if (res < 0)
goto out_netdev;
}
/* bond_init() must be called after dev_alloc_name() (for the
* /proc files), but before register_netdevice(), because we
* need to set function pointers.
*/
res = bond_init(bond_dev, params);
if (res < 0) {
goto out_netdev;
}
SET_MODULE_OWNER(bond_dev);
res = register_netdevice(bond_dev);
if (res < 0) {
goto out_bond;
}
lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
if (newbond)
*newbond = bond_dev->priv;
netif_carrier_off(bond_dev);
rtnl_unlock(); /* allows sysfs registration of net device */
res = bond_create_sysfs_entry(bond_dev->priv);
if (res < 0) {
rtnl_lock();
goto out_bond;
}
return 0;
out_bond:
bond_deinit(bond_dev);
out_netdev:
free_netdev(bond_dev);
out_rtnl:
rtnl_unlock();
return res;
}
static int __init bonding_init(void)
{
int i;
int res;
printk(KERN_INFO "%s", version);
res = bond_check_params(&bonding_defaults);
if (res) {
goto out;
}
#ifdef CONFIG_PROC_FS
bond_create_proc_dir();
#endif
for (i = 0; i < max_bonds; i++) {
res = bond_create(NULL, &bonding_defaults, NULL);
if (res)
goto err;
}
res = bond_create_sysfs();
if (res)
goto err;
register_netdevice_notifier(&bond_netdev_notifier);
register_inetaddr_notifier(&bond_inetaddr_notifier);
goto out;
err:
rtnl_lock();
bond_free_all();
bond_destroy_sysfs();
rtnl_unlock();
out:
return res;
}
static void __exit bonding_exit(void)
{
unregister_netdevice_notifier(&bond_netdev_notifier);
unregister_inetaddr_notifier(&bond_inetaddr_notifier);
rtnl_lock();
bond_free_all();
bond_destroy_sysfs();
rtnl_unlock();
}
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");
MODULE_SUPPORTED_DEVICE("most ethernet devices");
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
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