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linux/drivers/net/bonding/bond_main.c
Arjan van de Ven d54b1fdb1d [PATCH] mark struct file_operations const 5 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

4839 lines
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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/sched.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/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 -----------------------------*/
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 = bond->vlgrp->vlan_devices[vid];
slave_dev->vlan_rx_kill_vid(slave_dev, vid);
bond->vlgrp->vlan_devices[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 = bond->vlgrp->vlan_devices[vlan->vlan_id];
slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
bond->vlgrp->vlan_devices[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);
}
}
}
/*
* 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;
}
}
/*
* 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);
}
}
}
/**
* 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 ----------------------------------*/
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;
}
if (slave_dev->get_stats == NULL) {
printk(KERN_NOTICE DRV_NAME
": %s: the driver for slave device %s does not provide "
"get_stats function, network statistics will be "
"inaccurate.\n", bond_dev->name, slave_dev->name);
}
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;
}
/* 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;
}
res = netdev_set_master(slave_dev, bond_dev);
if (res) {
dprintk("Error %d calling netdev_set_master\n", res);
goto err_close;
}
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 = bond->vlgrp->vlan_devices[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 = bond->vlgrp->vlan_devices[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 = skb->nh.arph;
if (arp->ar_hln != dev->addr_len ||
skb->pkt_type == PACKET_OTHERHOST ||
skb->pkt_type == PACKET_LOOPBACK ||
arp->ar_hrd != htons(ARPHRD_ETHER) ||
arp->ar_pro != htons(ETH_P_IP) ||
arp->ar_pln != 4)
goto out_unlock;
arp_ptr = (unsigned char *)(arp + 1);
arp_ptr += dev->addr_len;
memcpy(&sip, arp_ptr, 4);
arp_ptr += 4 + dev->addr_len;
memcpy(&tip, arp_ptr, 4);
dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
" tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
slave->state, bond->params.arp_validate,
slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
/*
* Backup slaves won't see the ARP reply, but do come through
* here for each ARP probe (so we swap the sip/tip to validate
* the probe). In a "redundant switch, common router" type of
* configuration, the ARP probe will (hopefully) travel from
* the active, through one switch, the router, then the other
* switch before reaching the backup.
*/
if (slave->state == BOND_STATE_ACTIVE)
bond_validate_arp(bond, slave, sip, tip);
else
bond_validate_arp(bond, slave, tip, sip);
out_unlock:
read_unlock(&bond->lock);
out:
dev_kfree_skb(skb);
return NET_RX_SUCCESS;
}
/*
* this function is called regularly to monitor each slave's link
* ensuring that traffic is being sent and received when arp monitoring
* 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 = bond->vlgrp->vlan_devices[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;
pt->type = htons(ETH_P_ARP);
pt->dev = NULL; /*bond->dev;XXX*/
pt->func = bond_arp_rcv;
dev_add_pack(pt);
}
void bond_unregister_arp(struct bonding *bond)
{
dev_remove_pack(&bond->arp_mon_pt);
}
/*---------------------------- Hashing Policies -----------------------------*/
/*
* Hash for the 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 = skb->nh.iph;
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) {
if (slave->dev->get_stats) {
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;
}
static void bond_activebackup_xmit_copy(struct sk_buff *skb,
struct bonding *bond,
struct slave *slave)
{
struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
struct ethhdr *eth_data;
u8 *hwaddr;
int res;
if (!skb2) {
printk(KERN_ERR DRV_NAME ": Error: "
"bond_activebackup_xmit_copy(): skb_copy() failed\n");
return;
}
skb2->mac.raw = (unsigned char *)skb2->data;
eth_data = eth_hdr(skb2);
/* Pick an appropriate source MAC address
* -- use slave's perm MAC addr, unless used by bond
* -- otherwise, borrow active slave's perm MAC addr
* since that will not be used
*/
hwaddr = slave->perm_hwaddr;
if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
hwaddr = bond->curr_active_slave->perm_hwaddr;
/* Set source MAC address appropriately */
memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
res = bond_dev_queue_xmit(bond, skb2, slave->dev);
if (res)
dev_kfree_skb(skb2);
return;
}
/*
* 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;
/* Xmit IGMP frames on all slaves to ensure rapid fail-over
for multicast traffic on snooping switches */
if (skb->protocol == __constant_htons(ETH_P_IP) &&
skb->nh.iph->protocol == IPPROTO_IGMP) {
struct slave *slave, *active_slave;
int i;
active_slave = bond->curr_active_slave;
bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
active_slave->prev)
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP))
bond_activebackup_xmit_copy(skb, bond, slave);
}
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);
unregister_netdevice(bond_dev);
bond_deinit(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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