| /* |
| * 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. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/interrupt.h> |
| #include <linux/ptrace.h> |
| #include <linux/ioport.h> |
| #include <linux/in.h> |
| #include <net/ip.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <linux/udp.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/init.h> |
| #include <linux/timer.h> |
| #include <linux/socket.h> |
| #include <linux/ctype.h> |
| #include <linux/inet.h> |
| #include <linux/bitops.h> |
| #include <linux/io.h> |
| #include <asm/dma.h> |
| #include <linux/uaccess.h> |
| #include <linux/errno.h> |
| #include <linux/netdevice.h> |
| #include <linux/inetdevice.h> |
| #include <linux/igmp.h> |
| #include <linux/etherdevice.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/smp.h> |
| #include <linux/if_ether.h> |
| #include <net/arp.h> |
| #include <linux/mii.h> |
| #include <linux/ethtool.h> |
| #include <linux/if_vlan.h> |
| #include <linux/if_bonding.h> |
| #include <linux/jiffies.h> |
| #include <linux/preempt.h> |
| #include <net/route.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/pkt_sched.h> |
| #include <linux/rculist.h> |
| #include <net/flow_dissector.h> |
| #include <net/switchdev.h> |
| #include <net/bonding.h> |
| #include <net/bond_3ad.h> |
| #include <net/bond_alb.h> |
| |
| #include "bonding_priv.h" |
| |
| /*---------------------------- Module parameters ----------------------------*/ |
| |
| /* monitor all links that often (in milliseconds). <=0 disables monitoring */ |
| |
| static int max_bonds = BOND_DEFAULT_MAX_BONDS; |
| static int tx_queues = BOND_DEFAULT_TX_QUEUES; |
| static int num_peer_notif = 1; |
| static int miimon; |
| static int updelay; |
| static int downdelay; |
| static int use_carrier = 1; |
| static char *mode; |
| static char *primary; |
| static char *primary_reselect; |
| static char *lacp_rate; |
| static int min_links; |
| static char *ad_select; |
| static char *xmit_hash_policy; |
| static int arp_interval; |
| static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; |
| static char *arp_validate; |
| static char *arp_all_targets; |
| static char *fail_over_mac; |
| static int all_slaves_active; |
| static struct bond_params bonding_defaults; |
| static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; |
| static int packets_per_slave = 1; |
| static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; |
| |
| module_param(max_bonds, int, 0); |
| MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); |
| module_param(tx_queues, int, 0); |
| MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); |
| module_param_named(num_grat_arp, num_peer_notif, int, 0644); |
| MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " |
| "failover event (alias of num_unsol_na)"); |
| module_param_named(num_unsol_na, num_peer_notif, int, 0644); |
| MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " |
| "failover event (alias of num_grat_arp)"); |
| module_param(miimon, int, 0); |
| MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); |
| module_param(updelay, int, 0); |
| MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); |
| module_param(downdelay, int, 0); |
| MODULE_PARM_DESC(downdelay, "Delay before considering link down, " |
| "in milliseconds"); |
| module_param(use_carrier, int, 0); |
| MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " |
| "0 for off, 1 for on (default)"); |
| module_param(mode, charp, 0); |
| MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " |
| "1 for active-backup, 2 for balance-xor, " |
| "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " |
| "6 for balance-alb"); |
| module_param(primary, charp, 0); |
| MODULE_PARM_DESC(primary, "Primary network device to use"); |
| module_param(primary_reselect, charp, 0); |
| MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " |
| "once it comes up; " |
| "0 for always (default), " |
| "1 for only if speed of primary is " |
| "better, " |
| "2 for only on active slave " |
| "failure"); |
| module_param(lacp_rate, charp, 0); |
| MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " |
| "0 for slow, 1 for fast"); |
| module_param(ad_select, charp, 0); |
| MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " |
| "0 for stable (default), 1 for bandwidth, " |
| "2 for count"); |
| module_param(min_links, int, 0); |
| MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); |
| |
| module_param(xmit_hash_policy, charp, 0); |
| MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " |
| "0 for layer 2 (default), 1 for layer 3+4, " |
| "2 for layer 2+3, 3 for encap layer 2+3, " |
| "4 for encap layer 3+4"); |
| module_param(arp_interval, int, 0); |
| MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); |
| module_param_array(arp_ip_target, charp, NULL, 0); |
| MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); |
| module_param(arp_validate, charp, 0); |
| MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " |
| "0 for none (default), 1 for active, " |
| "2 for backup, 3 for all"); |
| module_param(arp_all_targets, charp, 0); |
| MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); |
| module_param(fail_over_mac, charp, 0); |
| MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " |
| "the same MAC; 0 for none (default), " |
| "1 for active, 2 for follow"); |
| module_param(all_slaves_active, int, 0); |
| MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " |
| "by setting active flag for all slaves; " |
| "0 for never (default), 1 for always."); |
| module_param(resend_igmp, int, 0); |
| MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " |
| "link failure"); |
| module_param(packets_per_slave, int, 0); |
| MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " |
| "mode; 0 for a random slave, 1 packet per " |
| "slave (default), >1 packets per slave."); |
| module_param(lp_interval, uint, 0); |
| MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " |
| "the bonding driver sends learning packets to " |
| "each slaves peer switch. The default is 1."); |
| |
| /*----------------------------- Global variables ----------------------------*/ |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| atomic_t netpoll_block_tx = ATOMIC_INIT(0); |
| #endif |
| |
| unsigned int bond_net_id __read_mostly; |
| |
| /*-------------------------- Forward declarations ---------------------------*/ |
| |
| static int bond_init(struct net_device *bond_dev); |
| static void bond_uninit(struct net_device *bond_dev); |
| static void bond_get_stats(struct net_device *bond_dev, |
| struct rtnl_link_stats64 *stats); |
| static void bond_slave_arr_handler(struct work_struct *work); |
| static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, |
| int mod); |
| static void bond_netdev_notify_work(struct work_struct *work); |
| |
| /*---------------------------- General routines -----------------------------*/ |
| |
| const char *bond_mode_name(int mode) |
| { |
| static const char *names[] = { |
| [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", |
| [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", |
| [BOND_MODE_XOR] = "load balancing (xor)", |
| [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", |
| [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", |
| [BOND_MODE_TLB] = "transmit load balancing", |
| [BOND_MODE_ALB] = "adaptive load balancing", |
| }; |
| |
| if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) |
| return "unknown"; |
| |
| return names[mode]; |
| } |
| |
| /*---------------------------------- VLAN -----------------------------------*/ |
| |
| /** |
| * bond_dev_queue_xmit - Prepare skb for xmit. |
| * |
| * @bond: bond device that got this skb for tx. |
| * @skb: hw accel VLAN tagged skb to transmit |
| * @slave_dev: slave that is supposed to xmit this skbuff |
| */ |
| void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, |
| struct net_device *slave_dev) |
| { |
| skb->dev = slave_dev; |
| |
| BUILD_BUG_ON(sizeof(skb->queue_mapping) != |
| sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); |
| skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); |
| |
| if (unlikely(netpoll_tx_running(bond->dev))) |
| bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); |
| else |
| dev_queue_xmit(skb); |
| } |
| |
| /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, |
| * We don't protect the slave list iteration with a lock because: |
| * a. This operation is performed in IOCTL context, |
| * b. The operation is protected by the RTNL semaphore in the 8021q code, |
| * c. Holding a lock with BH disabled while directly calling a base driver |
| * entry point is generally a BAD idea. |
| * |
| * The design of synchronization/protection for this operation in the 8021q |
| * module is good for one or more VLAN devices over a single physical device |
| * and cannot be extended for a teaming solution like bonding, so there is a |
| * potential race condition here where a net device from the vlan group might |
| * be referenced (either by a base driver or the 8021q code) while it is being |
| * removed from the system. However, it turns out we're not making matters |
| * worse, and if it works for regular VLAN usage it will work here too. |
| */ |
| |
| /** |
| * bond_vlan_rx_add_vid - Propagates adding an id to slaves |
| * @bond_dev: bonding net device that got called |
| * @vid: vlan id being added |
| */ |
| static int bond_vlan_rx_add_vid(struct net_device *bond_dev, |
| __be16 proto, u16 vid) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct slave *slave, *rollback_slave; |
| struct list_head *iter; |
| int res; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| res = vlan_vid_add(slave->dev, proto, vid); |
| if (res) |
| goto unwind; |
| } |
| |
| return 0; |
| |
| unwind: |
| /* unwind to the slave that failed */ |
| bond_for_each_slave(bond, rollback_slave, iter) { |
| if (rollback_slave == slave) |
| break; |
| |
| vlan_vid_del(rollback_slave->dev, proto, vid); |
| } |
| |
| return res; |
| } |
| |
| /** |
| * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves |
| * @bond_dev: bonding net device that got called |
| * @vid: vlan id being removed |
| */ |
| static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, |
| __be16 proto, u16 vid) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct list_head *iter; |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) |
| vlan_vid_del(slave->dev, proto, vid); |
| |
| if (bond_is_lb(bond)) |
| bond_alb_clear_vlan(bond, vid); |
| |
| return 0; |
| } |
| |
| /*------------------------------- Link status -------------------------------*/ |
| |
| /* Set the carrier state for the master according to the state of its |
| * slaves. If any slaves are up, the master is up. In 802.3ad mode, |
| * do special 802.3ad magic. |
| * |
| * Returns zero if carrier state does not change, nonzero if it does. |
| */ |
| int bond_set_carrier(struct bonding *bond) |
| { |
| struct list_head *iter; |
| struct slave *slave; |
| |
| if (!bond_has_slaves(bond)) |
| goto down; |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) |
| return bond_3ad_set_carrier(bond); |
| |
| bond_for_each_slave(bond, slave, iter) { |
| if (slave->link == BOND_LINK_UP) { |
| if (!netif_carrier_ok(bond->dev)) { |
| netif_carrier_on(bond->dev); |
| return 1; |
| } |
| return 0; |
| } |
| } |
| |
| down: |
| if (netif_carrier_ok(bond->dev)) { |
| netif_carrier_off(bond->dev); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Get link speed and duplex from the slave's base driver |
| * using ethtool. If for some reason the call fails or the |
| * values are invalid, set speed and duplex to -1, |
| * and return. Return 1 if speed or duplex settings are |
| * UNKNOWN; 0 otherwise. |
| */ |
| static int bond_update_speed_duplex(struct slave *slave) |
| { |
| struct net_device *slave_dev = slave->dev; |
| struct ethtool_link_ksettings ecmd; |
| int res; |
| |
| slave->speed = SPEED_UNKNOWN; |
| slave->duplex = DUPLEX_UNKNOWN; |
| |
| res = __ethtool_get_link_ksettings(slave_dev, &ecmd); |
| if (res < 0) |
| return 1; |
| if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) |
| return 1; |
| switch (ecmd.base.duplex) { |
| case DUPLEX_FULL: |
| case DUPLEX_HALF: |
| break; |
| default: |
| return 1; |
| } |
| |
| slave->speed = ecmd.base.speed; |
| slave->duplex = ecmd.base.duplex; |
| |
| return 0; |
| } |
| |
| const char *bond_slave_link_status(s8 link) |
| { |
| switch (link) { |
| case BOND_LINK_UP: |
| return "up"; |
| case BOND_LINK_FAIL: |
| return "going down"; |
| case BOND_LINK_DOWN: |
| return "down"; |
| case BOND_LINK_BACK: |
| return "going back"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| /* if <dev> supports MII link status reporting, check its link status. |
| * |
| * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), |
| * depending upon the setting of the use_carrier parameter. |
| * |
| * Return either BMSR_LSTATUS, meaning that the link is up (or we |
| * can't tell and just pretend it is), or 0, meaning that the link is |
| * down. |
| * |
| * If reporting is non-zero, instead of faking link up, return -1 if |
| * both ETHTOOL and MII ioctls fail (meaning the device does not |
| * support them). If use_carrier is set, return whatever it says. |
| * It'd be nice if there was a good way to tell if a driver supports |
| * netif_carrier, but there really isn't. |
| */ |
| static int bond_check_dev_link(struct bonding *bond, |
| struct net_device *slave_dev, int reporting) |
| { |
| const struct net_device_ops *slave_ops = slave_dev->netdev_ops; |
| int (*ioctl)(struct net_device *, struct ifreq *, int); |
| struct ifreq ifr; |
| struct mii_ioctl_data *mii; |
| |
| if (!reporting && !netif_running(slave_dev)) |
| return 0; |
| |
| if (bond->params.use_carrier) |
| return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; |
| |
| /* Try to get link status using Ethtool first. */ |
| if (slave_dev->ethtool_ops->get_link) |
| return slave_dev->ethtool_ops->get_link(slave_dev) ? |
| BMSR_LSTATUS : 0; |
| |
| /* Ethtool can't be used, fallback to MII ioctls. */ |
| ioctl = slave_ops->ndo_do_ioctl; |
| if (ioctl) { |
| /* TODO: set pointer to correct ioctl on a per team member |
| * bases to make this more efficient. that is, once |
| * we determine the correct ioctl, we will always |
| * call it and not the others for that team |
| * member. |
| */ |
| |
| /* We cannot assume that SIOCGMIIPHY will also read a |
| * register; not all network drivers (e.g., e100) |
| * support that. |
| */ |
| |
| /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ |
| strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); |
| mii = if_mii(&ifr); |
| if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { |
| mii->reg_num = MII_BMSR; |
| if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) |
| return mii->val_out & BMSR_LSTATUS; |
| } |
| } |
| |
| /* If reporting, report that either there's no dev->do_ioctl, |
| * or both SIOCGMIIREG and get_link failed (meaning that we |
| * cannot report link status). If not reporting, pretend |
| * we're ok. |
| */ |
| return reporting ? -1 : BMSR_LSTATUS; |
| } |
| |
| /*----------------------------- Multicast list ------------------------------*/ |
| |
| /* Push the promiscuity flag down to appropriate slaves */ |
| static int bond_set_promiscuity(struct bonding *bond, int inc) |
| { |
| struct list_head *iter; |
| int err = 0; |
| |
| if (bond_uses_primary(bond)) { |
| struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
| |
| if (curr_active) |
| err = dev_set_promiscuity(curr_active->dev, inc); |
| } else { |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| err = dev_set_promiscuity(slave->dev, inc); |
| if (err) |
| return err; |
| } |
| } |
| return err; |
| } |
| |
| /* Push the allmulti flag down to all slaves */ |
| static int bond_set_allmulti(struct bonding *bond, int inc) |
| { |
| struct list_head *iter; |
| int err = 0; |
| |
| if (bond_uses_primary(bond)) { |
| struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
| |
| if (curr_active) |
| err = dev_set_allmulti(curr_active->dev, inc); |
| } else { |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| err = dev_set_allmulti(slave->dev, inc); |
| if (err) |
| return err; |
| } |
| } |
| return err; |
| } |
| |
| /* Retrieve the list of registered multicast addresses for the bonding |
| * device and retransmit an IGMP JOIN request to the current active |
| * slave. |
| */ |
| static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) |
| { |
| struct bonding *bond = container_of(work, struct bonding, |
| mcast_work.work); |
| |
| if (!rtnl_trylock()) { |
| queue_delayed_work(bond->wq, &bond->mcast_work, 1); |
| return; |
| } |
| call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); |
| |
| if (bond->igmp_retrans > 1) { |
| bond->igmp_retrans--; |
| queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); |
| } |
| rtnl_unlock(); |
| } |
| |
| /* Flush bond's hardware addresses from slave */ |
| static void bond_hw_addr_flush(struct net_device *bond_dev, |
| struct net_device *slave_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| |
| dev_uc_unsync(slave_dev, bond_dev); |
| dev_mc_unsync(slave_dev, bond_dev); |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) { |
| /* del lacpdu mc addr from mc list */ |
| u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; |
| |
| dev_mc_del(slave_dev, lacpdu_multicast); |
| } |
| } |
| |
| /*--------------------------- Active slave change ---------------------------*/ |
| |
| /* Update the hardware address list and promisc/allmulti for the new and |
| * old active slaves (if any). Modes that are not using primary keep all |
| * slaves up date at all times; only the modes that use primary need to call |
| * this function to swap these settings during a failover. |
| */ |
| static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, |
| struct slave *old_active) |
| { |
| if (old_active) { |
| if (bond->dev->flags & IFF_PROMISC) |
| dev_set_promiscuity(old_active->dev, -1); |
| |
| if (bond->dev->flags & IFF_ALLMULTI) |
| dev_set_allmulti(old_active->dev, -1); |
| |
| bond_hw_addr_flush(bond->dev, old_active->dev); |
| } |
| |
| if (new_active) { |
| /* FIXME: Signal errors upstream. */ |
| if (bond->dev->flags & IFF_PROMISC) |
| dev_set_promiscuity(new_active->dev, 1); |
| |
| if (bond->dev->flags & IFF_ALLMULTI) |
| dev_set_allmulti(new_active->dev, 1); |
| |
| netif_addr_lock_bh(bond->dev); |
| dev_uc_sync(new_active->dev, bond->dev); |
| dev_mc_sync(new_active->dev, bond->dev); |
| netif_addr_unlock_bh(bond->dev); |
| } |
| } |
| |
| /** |
| * bond_set_dev_addr - clone slave's address to bond |
| * @bond_dev: bond net device |
| * @slave_dev: slave net device |
| * |
| * Should be called with RTNL held. |
| */ |
| static void bond_set_dev_addr(struct net_device *bond_dev, |
| struct net_device *slave_dev) |
| { |
| netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n", |
| bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len); |
| memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); |
| bond_dev->addr_assign_type = NET_ADDR_STOLEN; |
| call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); |
| } |
| |
| static struct slave *bond_get_old_active(struct bonding *bond, |
| struct slave *new_active) |
| { |
| struct slave *slave; |
| struct list_head *iter; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| if (slave == new_active) |
| continue; |
| |
| if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) |
| return slave; |
| } |
| |
| return NULL; |
| } |
| |
| /* bond_do_fail_over_mac |
| * |
| * Perform special MAC address swapping for fail_over_mac settings |
| * |
| * Called with RTNL |
| */ |
| static void bond_do_fail_over_mac(struct bonding *bond, |
| struct slave *new_active, |
| struct slave *old_active) |
| { |
| u8 tmp_mac[MAX_ADDR_LEN]; |
| struct sockaddr_storage ss; |
| int rv; |
| |
| switch (bond->params.fail_over_mac) { |
| case BOND_FOM_ACTIVE: |
| if (new_active) |
| bond_set_dev_addr(bond->dev, new_active->dev); |
| break; |
| case BOND_FOM_FOLLOW: |
| /* if new_active && old_active, swap them |
| * if just old_active, do nothing (going to no active slave) |
| * if just new_active, set new_active to bond's MAC |
| */ |
| if (!new_active) |
| return; |
| |
| if (!old_active) |
| old_active = bond_get_old_active(bond, new_active); |
| |
| if (old_active) { |
| bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, |
| new_active->dev->addr_len); |
| bond_hw_addr_copy(ss.__data, |
| old_active->dev->dev_addr, |
| old_active->dev->addr_len); |
| ss.ss_family = new_active->dev->type; |
| } else { |
| bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, |
| bond->dev->addr_len); |
| ss.ss_family = bond->dev->type; |
| } |
| |
| rv = dev_set_mac_address(new_active->dev, |
| (struct sockaddr *)&ss); |
| if (rv) { |
| netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", |
| -rv, new_active->dev->name); |
| goto out; |
| } |
| |
| if (!old_active) |
| goto out; |
| |
| bond_hw_addr_copy(ss.__data, tmp_mac, |
| new_active->dev->addr_len); |
| ss.ss_family = old_active->dev->type; |
| |
| rv = dev_set_mac_address(old_active->dev, |
| (struct sockaddr *)&ss); |
| if (rv) |
| netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", |
| -rv, new_active->dev->name); |
| out: |
| break; |
| default: |
| netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", |
| bond->params.fail_over_mac); |
| break; |
| } |
| |
| } |
| |
| static struct slave *bond_choose_primary_or_current(struct bonding *bond) |
| { |
| struct slave *prim = rtnl_dereference(bond->primary_slave); |
| struct slave *curr = rtnl_dereference(bond->curr_active_slave); |
| |
| if (!prim || prim->link != BOND_LINK_UP) { |
| if (!curr || curr->link != BOND_LINK_UP) |
| return NULL; |
| return curr; |
| } |
| |
| if (bond->force_primary) { |
| bond->force_primary = false; |
| return prim; |
| } |
| |
| if (!curr || curr->link != BOND_LINK_UP) |
| return prim; |
| |
| /* At this point, prim and curr are both up */ |
| switch (bond->params.primary_reselect) { |
| case BOND_PRI_RESELECT_ALWAYS: |
| return prim; |
| case BOND_PRI_RESELECT_BETTER: |
| if (prim->speed < curr->speed) |
| return curr; |
| if (prim->speed == curr->speed && prim->duplex <= curr->duplex) |
| return curr; |
| return prim; |
| case BOND_PRI_RESELECT_FAILURE: |
| return curr; |
| default: |
| netdev_err(bond->dev, "impossible primary_reselect %d\n", |
| bond->params.primary_reselect); |
| return curr; |
| } |
| } |
| |
| /** |
| * bond_find_best_slave - select the best available slave to be the active one |
| * @bond: our bonding struct |
| */ |
| static struct slave *bond_find_best_slave(struct bonding *bond) |
| { |
| struct slave *slave, *bestslave = NULL; |
| struct list_head *iter; |
| int mintime = bond->params.updelay; |
| |
| slave = bond_choose_primary_or_current(bond); |
| if (slave) |
| return slave; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| if (slave->link == BOND_LINK_UP) |
| return slave; |
| if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && |
| slave->delay < mintime) { |
| mintime = slave->delay; |
| bestslave = slave; |
| } |
| } |
| |
| return bestslave; |
| } |
| |
| static bool bond_should_notify_peers(struct bonding *bond) |
| { |
| struct slave *slave; |
| |
| rcu_read_lock(); |
| slave = rcu_dereference(bond->curr_active_slave); |
| rcu_read_unlock(); |
| |
| netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", |
| slave ? slave->dev->name : "NULL"); |
| |
| if (!slave || !bond->send_peer_notif || |
| !netif_carrier_ok(bond->dev) || |
| test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * change_active_interface - change the active slave into the specified one |
| * @bond: our bonding struct |
| * @new: the new slave to make the active one |
| * |
| * Set the new slave to the bond's settings and unset them on the old |
| * curr_active_slave. |
| * Setting include flags, mc-list, promiscuity, allmulti, etc. |
| * |
| * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, |
| * because it is apparently the best available slave we have, even though its |
| * updelay hasn't timed out yet. |
| * |
| * Caller must hold RTNL. |
| */ |
| void bond_change_active_slave(struct bonding *bond, struct slave *new_active) |
| { |
| struct slave *old_active; |
| |
| ASSERT_RTNL(); |
| |
| old_active = rtnl_dereference(bond->curr_active_slave); |
| |
| if (old_active == new_active) |
| return; |
| |
| if (new_active) { |
| new_active->last_link_up = jiffies; |
| |
| if (new_active->link == BOND_LINK_BACK) { |
| if (bond_uses_primary(bond)) { |
| netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", |
| new_active->dev->name, |
| (bond->params.updelay - new_active->delay) * bond->params.miimon); |
| } |
| |
| new_active->delay = 0; |
| bond_set_slave_link_state(new_active, BOND_LINK_UP, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) |
| bond_3ad_handle_link_change(new_active, BOND_LINK_UP); |
| |
| if (bond_is_lb(bond)) |
| bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); |
| } else { |
| if (bond_uses_primary(bond)) { |
| netdev_info(bond->dev, "making interface %s the new active one\n", |
| new_active->dev->name); |
| } |
| } |
| } |
| |
| if (bond_uses_primary(bond)) |
| bond_hw_addr_swap(bond, new_active, old_active); |
| |
| if (bond_is_lb(bond)) { |
| bond_alb_handle_active_change(bond, new_active); |
| if (old_active) |
| bond_set_slave_inactive_flags(old_active, |
| BOND_SLAVE_NOTIFY_NOW); |
| if (new_active) |
| bond_set_slave_active_flags(new_active, |
| BOND_SLAVE_NOTIFY_NOW); |
| } else { |
| rcu_assign_pointer(bond->curr_active_slave, new_active); |
| } |
| |
| if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { |
| if (old_active) |
| bond_set_slave_inactive_flags(old_active, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| if (new_active) { |
| bool should_notify_peers = false; |
| |
| bond_set_slave_active_flags(new_active, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| if (bond->params.fail_over_mac) |
| bond_do_fail_over_mac(bond, new_active, |
| old_active); |
| |
| if (netif_running(bond->dev)) { |
| bond->send_peer_notif = |
| bond->params.num_peer_notif; |
| should_notify_peers = |
| bond_should_notify_peers(bond); |
| } |
| |
| call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); |
| if (should_notify_peers) |
| call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, |
| bond->dev); |
| } |
| } |
| |
| /* resend IGMP joins since active slave has changed or |
| * all were sent on curr_active_slave. |
| * resend only if bond is brought up with the affected |
| * bonding modes and the retransmission is enabled |
| */ |
| if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && |
| ((bond_uses_primary(bond) && new_active) || |
| BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { |
| bond->igmp_retrans = bond->params.resend_igmp; |
| queue_delayed_work(bond->wq, &bond->mcast_work, 1); |
| } |
| } |
| |
| /** |
| * bond_select_active_slave - select a new active slave, if needed |
| * @bond: our bonding struct |
| * |
| * This functions should be called when one of the following occurs: |
| * - The old curr_active_slave has been released or lost its link. |
| * - The primary_slave has got its link back. |
| * - A slave has got its link back and there's no old curr_active_slave. |
| * |
| * Caller must hold RTNL. |
| */ |
| void bond_select_active_slave(struct bonding *bond) |
| { |
| struct slave *best_slave; |
| int rv; |
| |
| ASSERT_RTNL(); |
| |
| best_slave = bond_find_best_slave(bond); |
| if (best_slave != rtnl_dereference(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)) |
| netdev_info(bond->dev, "first active interface up!\n"); |
| else |
| netdev_info(bond->dev, "now running without any active interface!\n"); |
| } |
| } |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| static inline int slave_enable_netpoll(struct slave *slave) |
| { |
| struct netpoll *np; |
| int err = 0; |
| |
| np = kzalloc(sizeof(*np), GFP_KERNEL); |
| err = -ENOMEM; |
| if (!np) |
| goto out; |
| |
| err = __netpoll_setup(np, slave->dev); |
| if (err) { |
| kfree(np); |
| goto out; |
| } |
| slave->np = np; |
| out: |
| return err; |
| } |
| static inline void slave_disable_netpoll(struct slave *slave) |
| { |
| struct netpoll *np = slave->np; |
| |
| if (!np) |
| return; |
| |
| slave->np = NULL; |
| __netpoll_free_async(np); |
| } |
| |
| static void bond_poll_controller(struct net_device *bond_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct slave *slave = NULL; |
| struct list_head *iter; |
| struct ad_info ad_info; |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) |
| if (bond_3ad_get_active_agg_info(bond, &ad_info)) |
| return; |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| if (!bond_slave_is_up(slave)) |
| continue; |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) { |
| struct aggregator *agg = |
| SLAVE_AD_INFO(slave)->port.aggregator; |
| |
| if (agg && |
| agg->aggregator_identifier != ad_info.aggregator_id) |
| continue; |
| } |
| |
| netpoll_poll_dev(slave->dev); |
| } |
| } |
| |
| static void bond_netpoll_cleanup(struct net_device *bond_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct list_head *iter; |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) |
| if (bond_slave_is_up(slave)) |
| slave_disable_netpoll(slave); |
| } |
| |
| static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
| { |
| struct bonding *bond = netdev_priv(dev); |
| struct list_head *iter; |
| struct slave *slave; |
| int err = 0; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| err = slave_enable_netpoll(slave); |
| if (err) { |
| bond_netpoll_cleanup(dev); |
| break; |
| } |
| } |
| return err; |
| } |
| #else |
| static inline int slave_enable_netpoll(struct slave *slave) |
| { |
| return 0; |
| } |
| static inline void slave_disable_netpoll(struct slave *slave) |
| { |
| } |
| static void bond_netpoll_cleanup(struct net_device *bond_dev) |
| { |
| } |
| #endif |
| |
| /*---------------------------------- IOCTL ----------------------------------*/ |
| |
| static netdev_features_t bond_fix_features(struct net_device *dev, |
| netdev_features_t features) |
| { |
| struct bonding *bond = netdev_priv(dev); |
| struct list_head *iter; |
| netdev_features_t mask; |
| struct slave *slave; |
| |
| mask = features; |
| |
| features &= ~NETIF_F_ONE_FOR_ALL; |
| features |= NETIF_F_ALL_FOR_ALL; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| features = netdev_increment_features(features, |
| slave->dev->features, |
| mask); |
| } |
| features = netdev_add_tso_features(features, mask); |
| |
| return features; |
| } |
| |
| #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ |
| NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ |
| NETIF_F_HIGHDMA | NETIF_F_LRO) |
| |
| #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ |
| NETIF_F_RXCSUM | NETIF_F_ALL_TSO) |
| |
| static void bond_compute_features(struct bonding *bond) |
| { |
| unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | |
| IFF_XMIT_DST_RELEASE_PERM; |
| netdev_features_t vlan_features = BOND_VLAN_FEATURES; |
| netdev_features_t enc_features = BOND_ENC_FEATURES; |
| struct net_device *bond_dev = bond->dev; |
| struct list_head *iter; |
| struct slave *slave; |
| unsigned short max_hard_header_len = ETH_HLEN; |
| unsigned int gso_max_size = GSO_MAX_SIZE; |
| u16 gso_max_segs = GSO_MAX_SEGS; |
| |
| if (!bond_has_slaves(bond)) |
| goto done; |
| vlan_features &= NETIF_F_ALL_FOR_ALL; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| vlan_features = netdev_increment_features(vlan_features, |
| slave->dev->vlan_features, BOND_VLAN_FEATURES); |
| |
| enc_features = netdev_increment_features(enc_features, |
| slave->dev->hw_enc_features, |
| BOND_ENC_FEATURES); |
| dst_release_flag &= slave->dev->priv_flags; |
| if (slave->dev->hard_header_len > max_hard_header_len) |
| max_hard_header_len = slave->dev->hard_header_len; |
| |
| gso_max_size = min(gso_max_size, slave->dev->gso_max_size); |
| gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); |
| } |
| bond_dev->hard_header_len = max_hard_header_len; |
| |
| done: |
| bond_dev->vlan_features = vlan_features; |
| bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | |
| NETIF_F_HW_VLAN_CTAG_TX | |
| NETIF_F_HW_VLAN_STAG_TX | |
| NETIF_F_GSO_UDP_L4; |
| bond_dev->gso_max_segs = gso_max_segs; |
| netif_set_gso_max_size(bond_dev, gso_max_size); |
| |
| bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
| if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && |
| dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) |
| bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; |
| |
| netdev_change_features(bond_dev); |
| } |
| |
| static void bond_setup_by_slave(struct net_device *bond_dev, |
| struct net_device *slave_dev) |
| { |
| bond_dev->header_ops = slave_dev->header_ops; |
| |
| bond_dev->type = slave_dev->type; |
| bond_dev->hard_header_len = slave_dev->hard_header_len; |
| bond_dev->needed_headroom = slave_dev->needed_headroom; |
| bond_dev->addr_len = slave_dev->addr_len; |
| |
| memcpy(bond_dev->broadcast, slave_dev->broadcast, |
| slave_dev->addr_len); |
| } |
| |
| /* On bonding slaves other than the currently active slave, suppress |
| * duplicates except for alb non-mcast/bcast. |
| */ |
| static bool bond_should_deliver_exact_match(struct sk_buff *skb, |
| struct slave *slave, |
| struct bonding *bond) |
| { |
| if (bond_is_slave_inactive(slave)) { |
| if (BOND_MODE(bond) == BOND_MODE_ALB && |
| skb->pkt_type != PACKET_BROADCAST && |
| skb->pkt_type != PACKET_MULTICAST) |
| return false; |
| return true; |
| } |
| return false; |
| } |
| |
| static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) |
| { |
| struct sk_buff *skb = *pskb; |
| struct slave *slave; |
| struct bonding *bond; |
| int (*recv_probe)(const struct sk_buff *, struct bonding *, |
| struct slave *); |
| int ret = RX_HANDLER_ANOTHER; |
| |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| if (unlikely(!skb)) |
| return RX_HANDLER_CONSUMED; |
| |
| *pskb = skb; |
| |
| slave = bond_slave_get_rcu(skb->dev); |
| bond = slave->bond; |
| |
| recv_probe = READ_ONCE(bond->recv_probe); |
| if (recv_probe) { |
| ret = recv_probe(skb, bond, slave); |
| if (ret == RX_HANDLER_CONSUMED) { |
| consume_skb(skb); |
| return ret; |
| } |
| } |
| |
| /* |
| * For packets determined by bond_should_deliver_exact_match() call to |
| * be suppressed we want to make an exception for link-local packets. |
| * This is necessary for e.g. LLDP daemons to be able to monitor |
| * inactive slave links without being forced to bind to them |
| * explicitly. |
| * |
| * At the same time, packets that are passed to the bonding master |
| * (including link-local ones) can have their originating interface |
| * determined via PACKET_ORIGDEV socket option. |
| */ |
| if (bond_should_deliver_exact_match(skb, slave, bond)) { |
| if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) |
| return RX_HANDLER_PASS; |
| return RX_HANDLER_EXACT; |
| } |
| |
| skb->dev = bond->dev; |
| |
| if (BOND_MODE(bond) == BOND_MODE_ALB && |
| bond->dev->priv_flags & IFF_BRIDGE_PORT && |
| skb->pkt_type == PACKET_HOST) { |
| |
| if (unlikely(skb_cow_head(skb, |
| skb->data - skb_mac_header(skb)))) { |
| kfree_skb(skb); |
| return RX_HANDLER_CONSUMED; |
| } |
| bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, |
| bond->dev->addr_len); |
| } |
| |
| return ret; |
| } |
| |
| static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) |
| { |
| switch (BOND_MODE(bond)) { |
| case BOND_MODE_ROUNDROBIN: |
| return NETDEV_LAG_TX_TYPE_ROUNDROBIN; |
| case BOND_MODE_ACTIVEBACKUP: |
| return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; |
| case BOND_MODE_BROADCAST: |
| return NETDEV_LAG_TX_TYPE_BROADCAST; |
| case BOND_MODE_XOR: |
| case BOND_MODE_8023AD: |
| return NETDEV_LAG_TX_TYPE_HASH; |
| default: |
| return NETDEV_LAG_TX_TYPE_UNKNOWN; |
| } |
| } |
| |
| static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, |
| enum netdev_lag_tx_type type) |
| { |
| if (type != NETDEV_LAG_TX_TYPE_HASH) |
| return NETDEV_LAG_HASH_NONE; |
| |
| switch (bond->params.xmit_policy) { |
| case BOND_XMIT_POLICY_LAYER2: |
| return NETDEV_LAG_HASH_L2; |
| case BOND_XMIT_POLICY_LAYER34: |
| return NETDEV_LAG_HASH_L34; |
| case BOND_XMIT_POLICY_LAYER23: |
| return NETDEV_LAG_HASH_L23; |
| case BOND_XMIT_POLICY_ENCAP23: |
| return NETDEV_LAG_HASH_E23; |
| case BOND_XMIT_POLICY_ENCAP34: |
| return NETDEV_LAG_HASH_E34; |
| default: |
| return NETDEV_LAG_HASH_UNKNOWN; |
| } |
| } |
| |
| static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, |
| struct netlink_ext_ack *extack) |
| { |
| struct netdev_lag_upper_info lag_upper_info; |
| enum netdev_lag_tx_type type; |
| |
| type = bond_lag_tx_type(bond); |
| lag_upper_info.tx_type = type; |
| lag_upper_info.hash_type = bond_lag_hash_type(bond, type); |
| |
| return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, |
| &lag_upper_info, extack); |
| } |
| |
| static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) |
| { |
| netdev_upper_dev_unlink(slave->dev, bond->dev); |
| slave->dev->flags &= ~IFF_SLAVE; |
| } |
| |
| static void slave_kobj_release(struct kobject *kobj) |
| { |
| struct slave *slave = to_slave(kobj); |
| struct bonding *bond = bond_get_bond_by_slave(slave); |
| |
| cancel_delayed_work_sync(&slave->notify_work); |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) |
| kfree(SLAVE_AD_INFO(slave)); |
| |
| kfree(slave); |
| } |
| |
| static struct kobj_type slave_ktype = { |
| .release = slave_kobj_release, |
| #ifdef CONFIG_SYSFS |
| .sysfs_ops = &slave_sysfs_ops, |
| #endif |
| }; |
| |
| static int bond_kobj_init(struct slave *slave) |
| { |
| int err; |
| |
| err = kobject_init_and_add(&slave->kobj, &slave_ktype, |
| &(slave->dev->dev.kobj), "bonding_slave"); |
| if (err) |
| kobject_put(&slave->kobj); |
| |
| return err; |
| } |
| |
| static struct slave *bond_alloc_slave(struct bonding *bond, |
| struct net_device *slave_dev) |
| { |
| struct slave *slave = NULL; |
| |
| slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
| if (!slave) |
| return NULL; |
| |
| slave->bond = bond; |
| slave->dev = slave_dev; |
| INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); |
| |
| if (bond_kobj_init(slave)) |
| return NULL; |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) { |
| SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), |
| GFP_KERNEL); |
| if (!SLAVE_AD_INFO(slave)) { |
| kobject_put(&slave->kobj); |
| return NULL; |
| } |
| } |
| |
| return slave; |
| } |
| |
| static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) |
| { |
| info->bond_mode = BOND_MODE(bond); |
| info->miimon = bond->params.miimon; |
| info->num_slaves = bond->slave_cnt; |
| } |
| |
| static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) |
| { |
| strcpy(info->slave_name, slave->dev->name); |
| info->link = slave->link; |
| info->state = bond_slave_state(slave); |
| info->link_failure_count = slave->link_failure_count; |
| } |
| |
| static void bond_netdev_notify_work(struct work_struct *_work) |
| { |
| struct slave *slave = container_of(_work, struct slave, |
| notify_work.work); |
| |
| if (rtnl_trylock()) { |
| struct netdev_bonding_info binfo; |
| |
| bond_fill_ifslave(slave, &binfo.slave); |
| bond_fill_ifbond(slave->bond, &binfo.master); |
| netdev_bonding_info_change(slave->dev, &binfo); |
| rtnl_unlock(); |
| } else { |
| queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); |
| } |
| } |
| |
| void bond_queue_slave_event(struct slave *slave) |
| { |
| queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); |
| } |
| |
| void bond_lower_state_changed(struct slave *slave) |
| { |
| struct netdev_lag_lower_state_info info; |
| |
| info.link_up = slave->link == BOND_LINK_UP || |
| slave->link == BOND_LINK_FAIL; |
| info.tx_enabled = bond_is_active_slave(slave); |
| netdev_lower_state_changed(slave->dev, &info); |
| } |
| |
| /* enslave device <slave> to bond device <master> */ |
| int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, |
| struct netlink_ext_ack *extack) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| const struct net_device_ops *slave_ops = slave_dev->netdev_ops; |
| struct slave *new_slave = NULL, *prev_slave; |
| struct sockaddr_storage ss; |
| int link_reporting; |
| int res = 0, i; |
| |
| if (!bond->params.use_carrier && |
| slave_dev->ethtool_ops->get_link == NULL && |
| slave_ops->ndo_do_ioctl == NULL) { |
| netdev_warn(bond_dev, "no link monitoring support for %s\n", |
| slave_dev->name); |
| } |
| |
| /* already in-use? */ |
| if (netdev_is_rx_handler_busy(slave_dev)) { |
| NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved"); |
| netdev_err(bond_dev, |
| "Error: Device is in use and cannot be enslaved\n"); |
| return -EBUSY; |
| } |
| |
| if (bond_dev == slave_dev) { |
| NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself."); |
| netdev_err(bond_dev, "cannot enslave bond to itself.\n"); |
| return -EPERM; |
| } |
| |
| /* vlan challenged mutual exclusion */ |
| /* no need to lock since we're protected by rtnl_lock */ |
| if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { |
| netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", |
| slave_dev->name); |
| if (vlan_uses_dev(bond_dev)) { |
| NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond"); |
| netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", |
| slave_dev->name, bond_dev->name); |
| return -EPERM; |
| } else { |
| netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", |
| slave_dev->name, slave_dev->name, |
| bond_dev->name); |
| } |
| } else { |
| netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", |
| slave_dev->name); |
| } |
| |
| /* Old ifenslave binaries are no longer supported. These can |
| * be identified with moderate accuracy by the state of the slave: |
| * the current ifenslave will set the interface down prior to |
| * enslaving it; the old ifenslave will not. |
| */ |
| if (slave_dev->flags & IFF_UP) { |
| NL_SET_ERR_MSG(extack, "Device can not be enslaved while up"); |
| netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", |
| slave_dev->name); |
| return -EPERM; |
| } |
| |
| /* set bonding device ether type by slave - bonding netdevices are |
| * created with ether_setup, so when the slave type is not ARPHRD_ETHER |
| * there is a need to override some of the type dependent attribs/funcs. |
| * |
| * bond ether type mutual exclusion - don't allow slaves of dissimilar |
| * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond |
| */ |
| if (!bond_has_slaves(bond)) { |
| if (bond_dev->type != slave_dev->type) { |
| netdev_dbg(bond_dev, "change device type from %d to %d\n", |
| bond_dev->type, slave_dev->type); |
| |
| res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, |
| bond_dev); |
| res = notifier_to_errno(res); |
| if (res) { |
| netdev_err(bond_dev, "refused to change device type\n"); |
| return -EBUSY; |
| } |
| |
| /* Flush unicast and multicast addresses */ |
| dev_uc_flush(bond_dev); |
| dev_mc_flush(bond_dev); |
| |
| if (slave_dev->type != ARPHRD_ETHER) |
| bond_setup_by_slave(bond_dev, slave_dev); |
| else { |
| ether_setup(bond_dev); |
| bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| } |
| |
| call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, |
| bond_dev); |
| } |
| } else if (bond_dev->type != slave_dev->type) { |
| NL_SET_ERR_MSG(extack, "Device type is different from other slaves"); |
| netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", |
| slave_dev->name, slave_dev->type, bond_dev->type); |
| return -EINVAL; |
| } |
| |
| if (slave_dev->type == ARPHRD_INFINIBAND && |
| BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { |
| NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves"); |
| netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", |
| slave_dev->type); |
| res = -EOPNOTSUPP; |
| goto err_undo_flags; |
| } |
| |
| if (!slave_ops->ndo_set_mac_address || |
| slave_dev->type == ARPHRD_INFINIBAND) { |
| netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); |
| if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && |
| bond->params.fail_over_mac != BOND_FOM_ACTIVE) { |
| if (!bond_has_slaves(bond)) { |
| bond->params.fail_over_mac = BOND_FOM_ACTIVE; |
| netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); |
| } else { |
| NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); |
| netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n"); |
| res = -EOPNOTSUPP; |
| goto err_undo_flags; |
| } |
| } |
| } |
| |
| call_netdevice_notifiers(NETDEV_JOIN, slave_dev); |
| |
| /* If this is the first slave, then we need to set the master's hardware |
| * address to be the same as the slave's. |
| */ |
| if (!bond_has_slaves(bond) && |
| bond->dev->addr_assign_type == NET_ADDR_RANDOM) |
| bond_set_dev_addr(bond->dev, slave_dev); |
| |
| new_slave = bond_alloc_slave(bond, slave_dev); |
| if (!new_slave) { |
| res = -ENOMEM; |
| goto err_undo_flags; |
| } |
| |
| /* Set the new_slave's queue_id to be zero. Queue ID mapping |
| * is set via sysfs or module option if desired. |
| */ |
| new_slave->queue_id = 0; |
| |
| /* Save slave's original mtu and then set it to match the bond */ |
| new_slave->original_mtu = slave_dev->mtu; |
| res = dev_set_mtu(slave_dev, bond->dev->mtu); |
| if (res) { |
| netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); |
| goto err_free; |
| } |
| |
| /* Save slave's original ("permanent") mac address for modes |
| * that need it, and for restoring it upon release, and then |
| * set it to the master's address |
| */ |
| bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, |
| slave_dev->addr_len); |
| |
| if (!bond->params.fail_over_mac || |
| BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { |
| /* Set slave to master's mac address. The application already |
| * set the master's mac address to that of the first slave |
| */ |
| memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); |
| ss.ss_family = slave_dev->type; |
| res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); |
| if (res) { |
| netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); |
| goto err_restore_mtu; |
| } |
| } |
| |
| /* set slave flag before open to prevent IPv6 addrconf */ |
| slave_dev->flags |= IFF_SLAVE; |
| |
| /* open the slave since the application closed it */ |
| res = dev_open(slave_dev); |
| if (res) { |
| netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); |
| goto err_restore_mac; |
| } |
| |
| slave_dev->priv_flags |= IFF_BONDING; |
| /* initialize slave stats */ |
| dev_get_stats(new_slave->dev, &new_slave->slave_stats); |
| |
| if (bond_is_lb(bond)) { |
| /* bond_alb_init_slave() must be called before all other stages since |
| * it might fail and we do not want to have to undo everything |
| */ |
| res = bond_alb_init_slave(bond, new_slave); |
| if (res) |
| goto err_close; |
| } |
| |
| res = vlan_vids_add_by_dev(slave_dev, bond_dev); |
| if (res) { |
| netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", |
| slave_dev->name); |
| goto err_close; |
| } |
| |
| prev_slave = bond_last_slave(bond); |
| |
| new_slave->delay = 0; |
| new_slave->link_failure_count = 0; |
| |
| if (bond_update_speed_duplex(new_slave) && |
| bond_needs_speed_duplex(bond)) |
| new_slave->link = BOND_LINK_DOWN; |
| |
| new_slave->last_rx = jiffies - |
| (msecs_to_jiffies(bond->params.arp_interval) + 1); |
| for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) |
| new_slave->target_last_arp_rx[i] = new_slave->last_rx; |
| |
| if (bond->params.miimon && !bond->params.use_carrier) { |
| link_reporting = bond_check_dev_link(bond, slave_dev, 1); |
| |
| if ((link_reporting == -1) && !bond->params.arp_interval) { |
| /* miimon is set but a bonded network driver |
| * does not support ETHTOOL/MII and |
| * arp_interval is not set. Note: if |
| * use_carrier is enabled, we will never go |
| * here (because netif_carrier is always |
| * supported); thus, we don't need to change |
| * the messages for netif_carrier. |
| */ |
| netdev_warn(bond_dev, "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", |
| slave_dev->name); |
| } else if (link_reporting == -1) { |
| /* unable get link status using mii/ethtool */ |
| netdev_warn(bond_dev, "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", |
| slave_dev->name); |
| } |
| } |
| |
| /* check for initial state */ |
| new_slave->link = BOND_LINK_NOCHANGE; |
| if (bond->params.miimon) { |
| if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { |
| if (bond->params.updelay) { |
| bond_set_slave_link_state(new_slave, |
| BOND_LINK_BACK, |
| BOND_SLAVE_NOTIFY_NOW); |
| new_slave->delay = bond->params.updelay; |
| } else { |
| bond_set_slave_link_state(new_slave, |
| BOND_LINK_UP, |
| BOND_SLAVE_NOTIFY_NOW); |
| } |
| } else { |
| bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, |
| BOND_SLAVE_NOTIFY_NOW); |
| } |
| } else if (bond->params.arp_interval) { |
| bond_set_slave_link_state(new_slave, |
| (netif_carrier_ok(slave_dev) ? |
| BOND_LINK_UP : BOND_LINK_DOWN), |
| BOND_SLAVE_NOTIFY_NOW); |
| } else { |
| bond_set_slave_link_state(new_slave, BOND_LINK_UP, |
| BOND_SLAVE_NOTIFY_NOW); |
| } |
| |
| if (new_slave->link != BOND_LINK_DOWN) |
| new_slave->last_link_up = jiffies; |
| netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", |
| new_slave->link == BOND_LINK_DOWN ? "DOWN" : |
| (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); |
| |
| if (bond_uses_primary(bond) && bond->params.primary[0]) { |
| /* if there is a primary slave, remember it */ |
| if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { |
| rcu_assign_pointer(bond->primary_slave, new_slave); |
| bond->force_primary = true; |
| } |
| } |
| |
| switch (BOND_MODE(bond)) { |
| case BOND_MODE_ACTIVEBACKUP: |
| bond_set_slave_inactive_flags(new_slave, |
| BOND_SLAVE_NOTIFY_NOW); |
| break; |
| case BOND_MODE_8023AD: |
| /* in 802.3ad mode, the internal mechanism |
| * will activate the slaves in the selected |
| * aggregator |
| */ |
| bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); |
| /* if this is the first slave */ |
| if (!prev_slave) { |
| SLAVE_AD_INFO(new_slave)->id = 1; |
| /* Initialize AD with the number of times that the AD timer is called in 1 second |
| * can be called only after the mac address of the bond is set |
| */ |
| bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); |
| } else { |
| SLAVE_AD_INFO(new_slave)->id = |
| SLAVE_AD_INFO(prev_slave)->id + 1; |
| } |
| |
| bond_3ad_bind_slave(new_slave); |
| break; |
| case BOND_MODE_TLB: |
| case BOND_MODE_ALB: |
| bond_set_active_slave(new_slave); |
| bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); |
| break; |
| default: |
| netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); |
| |
| /* always active in trunk mode */ |
| bond_set_active_slave(new_slave); |
| |
| /* In trunking mode there is little meaning to curr_active_slave |
| * anyway (it holds no special properties of the bond device), |
| * so we can change it without calling change_active_interface() |
| */ |
| if (!rcu_access_pointer(bond->curr_active_slave) && |
| new_slave->link == BOND_LINK_UP) |
| rcu_assign_pointer(bond->curr_active_slave, new_slave); |
| |
| break; |
| } /* switch(bond_mode) */ |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| if (bond->dev->npinfo) { |
| if (slave_enable_netpoll(new_slave)) { |
| netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); |
| res = -EBUSY; |
| goto err_detach; |
| } |
| } |
| #endif |
| |
| if (!(bond_dev->features & NETIF_F_LRO)) |
| dev_disable_lro(slave_dev); |
| |
| res = netdev_rx_handler_register(slave_dev, bond_handle_frame, |
| new_slave); |
| if (res) { |
| netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); |
| goto err_detach; |
| } |
| |
| res = bond_master_upper_dev_link(bond, new_slave, extack); |
| if (res) { |
| netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); |
| goto err_unregister; |
| } |
| |
| res = bond_sysfs_slave_add(new_slave); |
| if (res) { |
| netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); |
| goto err_upper_unlink; |
| } |
| |
| bond->nest_level = dev_get_nest_level(bond_dev) + 1; |
| |
| /* If the mode uses primary, then the following is handled by |
| * bond_change_active_slave(). |
| */ |
| if (!bond_uses_primary(bond)) { |
| /* set promiscuity level to new slave */ |
| if (bond_dev->flags & IFF_PROMISC) { |
| res = dev_set_promiscuity(slave_dev, 1); |
| if (res) |
| goto err_sysfs_del; |
| } |
| |
| /* set allmulti level to new slave */ |
| if (bond_dev->flags & IFF_ALLMULTI) { |
| res = dev_set_allmulti(slave_dev, 1); |
| if (res) { |
| if (bond_dev->flags & IFF_PROMISC) |
| dev_set_promiscuity(slave_dev, -1); |
| goto err_sysfs_del; |
| } |
| } |
| |
| netif_addr_lock_bh(bond_dev); |
| dev_mc_sync_multiple(slave_dev, bond_dev); |
| dev_uc_sync_multiple(slave_dev, bond_dev); |
| netif_addr_unlock_bh(bond_dev); |
| |
| if (BOND_MODE(bond) == 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); |
| } |
| } |
| |
| bond->slave_cnt++; |
| bond_compute_features(bond); |
| bond_set_carrier(bond); |
| |
| if (bond_uses_primary(bond)) { |
| block_netpoll_tx(); |
| bond_select_active_slave(bond); |
| unblock_netpoll_tx(); |
| } |
| |
| if (bond_mode_can_use_xmit_hash(bond)) |
| bond_update_slave_arr(bond, NULL); |
| |
| |
| netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", |
| slave_dev->name, |
| bond_is_active_slave(new_slave) ? "an active" : "a backup", |
| new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); |
| |
| /* enslave is successful */ |
| bond_queue_slave_event(new_slave); |
| return 0; |
| |
| /* Undo stages on error */ |
| err_sysfs_del: |
| bond_sysfs_slave_del(new_slave); |
| |
| err_upper_unlink: |
| bond_upper_dev_unlink(bond, new_slave); |
| |
| err_unregister: |
| netdev_rx_handler_unregister(slave_dev); |
| |
| err_detach: |
| vlan_vids_del_by_dev(slave_dev, bond_dev); |
| if (rcu_access_pointer(bond->primary_slave) == new_slave) |
| RCU_INIT_POINTER(bond->primary_slave, NULL); |
| if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { |
| block_netpoll_tx(); |
| bond_change_active_slave(bond, NULL); |
| bond_select_active_slave(bond); |
| unblock_netpoll_tx(); |
| } |
| /* either primary_slave or curr_active_slave might've changed */ |
| synchronize_rcu(); |
| slave_disable_netpoll(new_slave); |
| |
| err_close: |
| if (!netif_is_bond_master(slave_dev)) |
| slave_dev->priv_flags &= ~IFF_BONDING; |
| dev_close(slave_dev); |
| |
| err_restore_mac: |
| slave_dev->flags &= ~IFF_SLAVE; |
| if (!bond->params.fail_over_mac || |
| BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { |
| /* XXX TODO - fom follow mode needs to change master's |
| * MAC if this slave's MAC is in use by the bond, or at |
| * least print a warning. |
| */ |
| bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, |
| new_slave->dev->addr_len); |
| ss.ss_family = slave_dev->type; |
| dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); |
| } |
| |
| err_restore_mtu: |
| dev_set_mtu(slave_dev, new_slave->original_mtu); |
| |
| err_free: |
| kobject_put(&new_slave->kobj); |
| |
| err_undo_flags: |
| /* Enslave of first slave has failed and we need to fix master's mac */ |
| if (!bond_has_slaves(bond)) { |
| if (ether_addr_equal_64bits(bond_dev->dev_addr, |
| slave_dev->dev_addr)) |
| eth_hw_addr_random(bond_dev); |
| if (bond_dev->type != ARPHRD_ETHER) { |
| dev_close(bond_dev); |
| ether_setup(bond_dev); |
| bond_dev->flags |= IFF_MASTER; |
| bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| } |
| } |
| |
| 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 RTNL-locked. If "all" is true it means that the function is being called |
| * while destroying a bond interface and all slaves are being released. |
| * |
| * The rules for slave state should be: |
| * for Active/Backup: |
| * Active stays on all backups go down |
| * for Bonded connections: |
| * The first up interface should be left on and all others downed. |
| */ |
| static int __bond_release_one(struct net_device *bond_dev, |
| struct net_device *slave_dev, |
| bool all, bool unregister) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct slave *slave, *oldcurrent; |
| struct sockaddr_storage ss; |
| int old_flags = bond_dev->flags; |
| netdev_features_t old_features = bond_dev->features; |
| |
| /* slave is not a slave or master is not master of this slave */ |
| if (!(slave_dev->flags & IFF_SLAVE) || |
| !netdev_has_upper_dev(slave_dev, bond_dev)) { |
| netdev_dbg(bond_dev, "cannot release %s\n", |
| slave_dev->name); |
| return -EINVAL; |
| } |
| |
| block_netpoll_tx(); |
| |
| slave = bond_get_slave_by_dev(bond, slave_dev); |
| if (!slave) { |
| /* not a slave of this bond */ |
| netdev_info(bond_dev, "%s not enslaved\n", |
| slave_dev->name); |
| unblock_netpoll_tx(); |
| return -EINVAL; |
| } |
| |
| bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); |
| |
| bond_sysfs_slave_del(slave); |
| |
| /* recompute stats just before removing the slave */ |
| bond_get_stats(bond->dev, &bond->bond_stats); |
| |
| /* unregister rx_handler early so bond_handle_frame wouldn't be called |
| * for this slave anymore. |
| */ |
| netdev_rx_handler_unregister(slave_dev); |
| |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) |
| bond_3ad_unbind_slave(slave); |
| |
| bond_upper_dev_unlink(bond, slave); |
| |
| if (bond_mode_can_use_xmit_hash(bond)) |
| bond_update_slave_arr(bond, slave); |
| |
| netdev_info(bond_dev, "Releasing %s interface %s\n", |
| bond_is_active_slave(slave) ? "active" : "backup", |
| slave_dev->name); |
| |
| oldcurrent = rcu_access_pointer(bond->curr_active_slave); |
| |
| RCU_INIT_POINTER(bond->current_arp_slave, NULL); |
| |
| if (!all && (!bond->params.fail_over_mac || |
| BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { |
| if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && |
| bond_has_slaves(bond)) |
| netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n", |
| slave_dev->name, slave->perm_hwaddr, |
| bond_dev->name, slave_dev->name); |
| } |
| |
| if (rtnl_dereference(bond->primary_slave) == slave) |
| RCU_INIT_POINTER(bond->primary_slave, NULL); |
| |
| if (oldcurrent == slave) |
| bond_change_active_slave(bond, NULL); |
| |
| if (bond_is_lb(bond)) { |
| /* Must be called only after the slave has been |
| * detached from the list and the curr_active_slave |
| * has been cleared (if our_slave == old_current), |
| * but before a new active slave is selected. |
| */ |
| bond_alb_deinit_slave(bond, slave); |
| } |
| |
| if (all) { |
| RCU_INIT_POINTER(bond->curr_active_slave, NULL); |
| } else if (oldcurrent == slave) { |
| /* Note that we hold RTNL over this sequence, so there |
| * is no concern that another slave add/remove event |
| * will interfere. |
| */ |
| bond_select_active_slave(bond); |
| } |
| |
| if (!bond_has_slaves(bond)) { |
| bond_set_carrier(bond); |
| eth_hw_addr_random(bond_dev); |
| bond->nest_level = SINGLE_DEPTH_NESTING; |
| } else { |
| bond->nest_level = dev_get_nest_level(bond_dev) + 1; |
| } |
| |
| unblock_netpoll_tx(); |
| synchronize_rcu(); |
| bond->slave_cnt--; |
| |
| if (!bond_has_slaves(bond)) { |
| call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); |
| call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); |
| } |
| |
| bond_compute_features(bond); |
| if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && |
| (old_features & NETIF_F_VLAN_CHALLENGED)) |
| netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", |
| slave_dev->name, bond_dev->name); |
| |
| vlan_vids_del_by_dev(slave_dev, bond_dev); |
| |
| /* If the mode uses primary, then this case was handled above by |
| * bond_change_active_slave(..., NULL) |
| */ |
| if (!bond_uses_primary(bond)) { |
| /* unset promiscuity level from slave |
| * NOTE: The NETDEV_CHANGEADDR call above may change the value |
| * of the IFF_PROMISC flag in the bond_dev, but we need the |
| * value of that flag before that change, as that was the value |
| * when this slave was attached, so we cache at the start of the |
| * function and use it here. Same goes for ALLMULTI below |
| */ |
| if (old_flags & IFF_PROMISC) |
| dev_set_promiscuity(slave_dev, -1); |
| |
| /* unset allmulti level from slave */ |
| if (old_flags & IFF_ALLMULTI) |
| dev_set_allmulti(slave_dev, -1); |
| |
| bond_hw_addr_flush(bond_dev, slave_dev); |
| } |
| |
| slave_disable_netpoll(slave); |
| |
| /* close slave before restoring its mac address */ |
| dev_close(slave_dev); |
| |
| if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || |
| BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { |
| /* restore original ("permanent") mac address */ |
| bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, |
| slave->dev->addr_len); |
| ss.ss_family = slave_dev->type; |
| dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); |
| } |
| |
| if (unregister) |
| __dev_set_mtu(slave_dev, slave->original_mtu); |
| else |
| dev_set_mtu(slave_dev, slave->original_mtu); |
| |
| if (!netif_is_bond_master(slave_dev)) |
| slave_dev->priv_flags &= ~IFF_BONDING; |
| |
| kobject_put(&slave->kobj); |
| |
| return 0; |
| } |
| |
| /* A wrapper used because of ndo_del_link */ |
| int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) |
| { |
| return __bond_release_one(bond_dev, slave_dev, false, false); |
| } |
| |
| /* First release a slave and then destroy the bond if no more slaves are left. |
| * Must be under rtnl_lock when this function is called. |
| */ |
| static int bond_release_and_destroy(struct net_device *bond_dev, |
| struct net_device *slave_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| int ret; |
| |
| ret = __bond_release_one(bond_dev, slave_dev, false, true); |
| if (ret == 0 && !bond_has_slaves(bond) && |
| bond_dev->reg_state != NETREG_UNREGISTERING) { |
| bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; |
| netdev_info(bond_dev, "Destroying bond %s\n", |
| bond_dev->name); |
| bond_remove_proc_entry(bond); |
| unregister_netdevice(bond_dev); |
| } |
| return ret; |
| } |
| |
| static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| bond_fill_ifbond(bond, info); |
| } |
| |
| static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct list_head *iter; |
| int i = 0, res = -ENODEV; |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| if (i++ == (int)info->slave_id) { |
| res = 0; |
| bond_fill_ifslave(slave, info); |
| break; |
| } |
| } |
| |
| return res; |
| } |
| |
| /*-------------------------------- Monitoring -------------------------------*/ |
| |
| /* called with rcu_read_lock() */ |
| static int bond_miimon_inspect(struct bonding *bond) |
| { |
| int link_state, commit = 0; |
| struct list_head *iter; |
| struct slave *slave; |
| bool ignore_updelay; |
| |
| ignore_updelay = !rcu_dereference(bond->curr_active_slave); |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| bond_propose_link_state(slave, BOND_LINK_NOCHANGE); |
| |
| link_state = bond_check_dev_link(bond, slave->dev, 0); |
| |
| switch (slave->link) { |
| case BOND_LINK_UP: |
| if (link_state) |
| continue; |
| |
| bond_propose_link_state(slave, BOND_LINK_FAIL); |
| commit++; |
| slave->delay = bond->params.downdelay; |
| if (slave->delay) { |
| netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", |
| (BOND_MODE(bond) == |
| BOND_MODE_ACTIVEBACKUP) ? |
| (bond_is_active_slave(slave) ? |
| "active " : "backup ") : "", |
| slave->dev->name, |
| bond->params.downdelay * bond->params.miimon); |
| } |
| /*FALLTHRU*/ |
| case BOND_LINK_FAIL: |
| if (link_state) { |
| /* recovered before downdelay expired */ |
| bond_propose_link_state(slave, BOND_LINK_UP); |
| slave->last_link_up = jiffies; |
| netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", |
| (bond->params.downdelay - slave->delay) * |
| bond->params.miimon, |
| slave->dev->name); |
| commit++; |
| continue; |
| } |
| |
| if (slave->delay <= 0) { |
| bond_propose_link_state(slave, BOND_LINK_DOWN); |
| commit++; |
| continue; |
| } |
| |
| slave->delay--; |
| break; |
| |
| case BOND_LINK_DOWN: |
| if (!link_state) |
| continue; |
| |
| bond_propose_link_state(slave, BOND_LINK_BACK); |
| commit++; |
| slave->delay = bond->params.updelay; |
| |
| if (slave->delay) { |
| netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", |
| slave->dev->name, |
| ignore_updelay ? 0 : |
| bond->params.updelay * |
| bond->params.miimon); |
| } |
| /*FALLTHRU*/ |
| case BOND_LINK_BACK: |
| if (!link_state) { |
| bond_propose_link_state(slave, BOND_LINK_DOWN); |
| netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", |
| (bond->params.updelay - slave->delay) * |
| bond->params.miimon, |
| slave->dev->name); |
| commit++; |
| continue; |
| } |
| |
| if (ignore_updelay) |
| slave->delay = 0; |
| |
| if (slave->delay <= 0) { |
| bond_propose_link_state(slave, BOND_LINK_UP); |
| commit++; |
| ignore_updelay = false; |
| continue; |
| } |
| |
| slave->delay--; |
| break; |
| } |
| } |
| |
| return commit; |
| } |
| |
| static void bond_miimon_link_change(struct bonding *bond, |
| struct slave *slave, |
| char link) |
| { |
| switch (BOND_MODE(bond)) { |
| case BOND_MODE_8023AD: |
| bond_3ad_handle_link_change(slave, link); |
| break; |
| case BOND_MODE_TLB: |
| case BOND_MODE_ALB: |
| bond_alb_handle_link_change(bond, slave, link); |
| break; |
| case BOND_MODE_XOR: |
| bond_update_slave_arr(bond, NULL); |
| break; |
| } |
| } |
| |
| static void bond_miimon_commit(struct bonding *bond) |
| { |
| struct list_head *iter; |
| struct slave *slave, *primary; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| switch (slave->link_new_state) { |
| case BOND_LINK_NOCHANGE: |
| /* For 802.3ad mode, check current slave speed and |
| * duplex again in case its port was disabled after |
| * invalid speed/duplex reporting but recovered before |
| * link monitoring could make a decision on the actual |
| * link status |
| */ |
| if (BOND_MODE(bond) == BOND_MODE_8023AD && |
| slave->link == BOND_LINK_UP) |
| bond_3ad_adapter_speed_duplex_changed(slave); |
| continue; |
| |
| case BOND_LINK_UP: |
| if (bond_update_speed_duplex(slave) && |
| bond_needs_speed_duplex(bond)) { |
| slave->link = BOND_LINK_DOWN; |
| if (net_ratelimit()) |
| netdev_warn(bond->dev, |
| "failed to get link speed/duplex for %s\n", |
| slave->dev->name); |
| continue; |
| } |
| bond_set_slave_link_state(slave, BOND_LINK_UP, |
| BOND_SLAVE_NOTIFY_NOW); |
| slave->last_link_up = jiffies; |
| |
| primary = rtnl_dereference(bond->primary_slave); |
| if (BOND_MODE(bond) == BOND_MODE_8023AD) { |
| /* prevent it from being the active one */ |
| bond_set_backup_slave(slave); |
| } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { |
| /* make it immediately active */ |
| bond_set_active_slave(slave); |
| } |
| |
| netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", |
| slave->dev->name, |
| slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, |
| slave->duplex ? "full" : "half"); |
| |
| bond_miimon_link_change(bond, slave, BOND_LINK_UP); |
| |
| if (!bond->curr_active_slave || slave == primary) |
| goto do_failover; |
| |
| continue; |
| |
| case BOND_LINK_DOWN: |
| if (slave->link_failure_count < UINT_MAX) |
| slave->link_failure_count++; |
| |
| bond_set_slave_link_state(slave, BOND_LINK_DOWN, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || |
| BOND_MODE(bond) == BOND_MODE_8023AD) |
| bond_set_slave_inactive_flags(slave, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", |
| slave->dev->name); |
| |
| bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); |
| |
| if (slave == rcu_access_pointer(bond->curr_active_slave)) |
| goto do_failover; |
| |
| continue; |
| |
| default: |
| netdev_err(bond->dev, "invalid new link %d on slave %s\n", |
| slave->link_new_state, slave->dev->name); |
| bond_propose_link_state(slave, BOND_LINK_NOCHANGE); |
| |
| continue; |
| } |
| |
| do_failover: |
| block_netpoll_tx(); |
| bond_select_active_slave(bond); |
| unblock_netpoll_tx(); |
| } |
| |
| bond_set_carrier(bond); |
| } |
| |
| /* bond_mii_monitor |
| * |
| * Really a wrapper that splits the mii monitor into two phases: an |
| * inspection, then (if inspection indicates something needs to be done) |
| * an acquisition of appropriate locks followed by a commit phase to |
| * implement whatever link state changes are indicated. |
| */ |
| static void bond_mii_monitor(struct work_struct *work) |
| { |
| struct bonding *bond = container_of(work, struct bonding, |
| mii_work.work); |
| bool should_notify_peers = false; |
| unsigned long delay; |
| struct slave *slave; |
| struct list_head *iter; |
| |
| delay = msecs_to_jiffies(bond->params.miimon); |
| |
| if (!bond_has_slaves(bond)) |
| goto re_arm; |
| |
| rcu_read_lock(); |
| |
| should_notify_peers = bond_should_notify_peers(bond); |
| |
| if (bond_miimon_inspect(bond)) { |
| rcu_read_unlock(); |
| |
| /* Race avoidance with bond_close cancel of workqueue */ |
| if (!rtnl_trylock()) { |
| delay = 1; |
| should_notify_peers = false; |
| goto re_arm; |
| } |
| |
| bond_for_each_slave(bond, slave, iter) { |
| bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); |
| } |
| bond_miimon_commit(bond); |
| |
| rtnl_unlock(); /* might sleep, hold no other locks */ |
| } else |
| rcu_read_unlock(); |
| |
| re_arm: |
| if (bond->params.miimon) |
| queue_delayed_work(bond->wq, &bond->mii_work, delay); |
| |
| if (should_notify_peers) { |
| if (!rtnl_trylock()) |
| return; |
| call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); |
| rtnl_unlock(); |
| } |
| } |
| |
| static int bond_upper_dev_walk(struct net_device *upper, void *data) |
| { |
| __be32 ip = *((__be32 *)data); |
| |
| return ip == bond_confirm_addr(upper, 0, ip); |
| } |
| |
| static bool bond_has_this_ip(struct bonding *bond, __be32 ip) |
| { |
| bool ret = false; |
| |
| if (ip == bond_confirm_addr(bond->dev, 0, ip)) |
| return true; |
| |
| rcu_read_lock(); |
| if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip)) |
| ret = true; |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| /* We go to the (large) trouble of VLAN tagging ARP frames because |
| * switches in VLAN mode (especially if ports are configured as |
| * "native" to a VLAN) might not pass non-tagged frames. |
| */ |
| static void bond_arp_send(struct net_device *slave_dev, int arp_op, |
| __be32 dest_ip, __be32 src_ip, |
| struct bond_vlan_tag *tags) |
| { |
| struct sk_buff *skb; |
| struct bond_vlan_tag *outer_tag = tags; |
| |
| netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", |
| arp_op, slave_dev->name, &dest_ip, &src_ip); |
| |
| skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, |
| NULL, slave_dev->dev_addr, NULL); |
| |
| if (!skb) { |
| net_err_ratelimited("ARP packet allocation failed\n"); |
| return; |
| } |
| |
| if (!tags || tags->vlan_proto == VLAN_N_VID) |
| goto xmit; |
| |
| tags++; |
| |
| /* Go through all the tags backwards and add them to the packet */ |
| while (tags->vlan_proto != VLAN_N_VID) { |
| if (!tags->vlan_id) { |
| tags++; |
| continue; |
| } |
| |
| netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", |
| ntohs(outer_tag->vlan_proto), tags->vlan_id); |
| skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, |
| tags->vlan_id); |
| if (!skb) { |
| net_err_ratelimited("failed to insert inner VLAN tag\n"); |
| return; |
| } |
| |
| tags++; |
| } |
| /* Set the outer tag */ |
| if (outer_tag->vlan_id) { |
| netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", |
| ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); |
| __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, |
| outer_tag->vlan_id); |
| } |
| |
| xmit: |
| arp_xmit(skb); |
| } |
| |
| /* Validate the device path between the @start_dev and the @end_dev. |
| * The path is valid if the @end_dev is reachable through device |
| * stacking. |
| * When the path is validated, collect any vlan information in the |
| * path. |
| */ |
| struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, |
| struct net_device *end_dev, |
| int level) |
| { |
| struct bond_vlan_tag *tags; |
| struct net_device *upper; |
| struct list_head *iter; |
| |
| if (start_dev == end_dev) { |
| tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); |
| if (!tags) |
| return ERR_PTR(-ENOMEM); |
| tags[level].vlan_proto = VLAN_N_VID; |
| return tags; |
| } |
| |
| netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { |
| tags = bond_verify_device_path(upper, end_dev, level + 1); |
| if (IS_ERR_OR_NULL(tags)) { |
| if (IS_ERR(tags)) |
| return tags; |
| continue; |
| } |
| if (is_vlan_dev(upper)) { |
| tags[level].vlan_proto = vlan_dev_vlan_proto(upper); |
| tags[level].vlan_id = vlan_dev_vlan_id(upper); |
| } |
| |
| return tags; |
| } |
| |
| return NULL; |
| } |
| |
| static void bond_arp_send_all(struct bonding *bond, struct slave *slave) |
| { |
| struct rtable *rt; |
| struct bond_vlan_tag *tags; |
| __be32 *targets = bond->params.arp_targets, addr; |
| int i; |
| |
| for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { |
| netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); |
| tags = NULL; |
| |
| /* Find out through which dev should the packet go */ |
| rt = ip_route_output(dev_net(bond->dev), targets[i], 0, |
| RTO_ONLINK, 0); |
| if (IS_ERR(rt)) { |
| /* there's no route to target - try to send arp |
| * probe to generate any traffic (arp_validate=0) |
| */ |
| if (bond->params.arp_validate) |
| net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", |
| bond->dev->name, |
| &targets[i]); |
| bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], |
| 0, tags); |
| continue; |
| } |
| |
| /* bond device itself */ |
| if (rt->dst.dev == bond->dev) |
| goto found; |
| |
| rcu_read_lock(); |
| tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); |
| rcu_read_unlock(); |
| |
| if (!IS_ERR_OR_NULL(tags)) |
| goto found; |
| |
| /* Not our device - skip */ |
| netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", |
| &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); |
| |
| ip_rt_put(rt); |
| continue; |
| |
| found: |
| addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); |
| ip_rt_put(rt); |
| bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], |
| addr, tags); |
| kfree(tags); |
| } |
| } |
| |
| static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) |
| { |
| int i; |
| |
| if (!sip || !bond_has_this_ip(bond, tip)) { |
| netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", |
| &sip, &tip); |
| return; |
| } |
| |
| i = bond_get_targets_ip(bond->params.arp_targets, sip); |
| if (i == -1) { |
| netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", |
| &sip); |
| return; |
| } |
| slave->last_rx = jiffies; |
| slave->target_last_arp_rx[i] = jiffies; |
| } |
| |
| int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, |
| struct slave *slave) |
| { |
| struct arphdr *arp = (struct arphdr *)skb->data; |
| struct slave *curr_active_slave, *curr_arp_slave; |
| unsigned char *arp_ptr; |
| __be32 sip, tip; |
| int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); |
| unsigned int alen; |
| |
| if (!slave_do_arp_validate(bond, slave)) { |
| if ((slave_do_arp_validate_only(bond) && is_arp) || |
| !slave_do_arp_validate_only(bond)) |
| slave->last_rx = jiffies; |
| return RX_HANDLER_ANOTHER; |
| } else if (!is_arp) { |
| return RX_HANDLER_ANOTHER; |
| } |
| |
| alen = arp_hdr_len(bond->dev); |
| |
| netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", |
| skb->dev->name); |
| |
| if (alen > skb_headlen(skb)) { |
| arp = kmalloc(alen, GFP_ATOMIC); |
| if (!arp) |
| goto out_unlock; |
| if (skb_copy_bits(skb, 0, arp, alen) < 0) |
| goto out_unlock; |
| } |
| |
| if (arp->ar_hln != bond->dev->addr_len || |
| skb->pkt_type == PACKET_OTHERHOST || |
| skb->pkt_type == PACKET_LOOPBACK || |
| arp->ar_hrd != htons(ARPHRD_ETHER) || |
| arp->ar_pro != htons(ETH_P_IP) || |
| arp->ar_pln != 4) |
| goto out_unlock; |
| |
| arp_ptr = (unsigned char *)(arp + 1); |
| arp_ptr += bond->dev->addr_len; |
| memcpy(&sip, arp_ptr, 4); |
| arp_ptr += 4 + bond->dev->addr_len; |
| memcpy(&tip, arp_ptr, 4); |
| |
| netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", |
| slave->dev->name, bond_slave_state(slave), |
| bond->params.arp_validate, slave_do_arp_validate(bond, slave), |
| &sip, &tip); |
| |
| curr_active_slave = rcu_dereference(bond->curr_active_slave); |
| curr_arp_slave = rcu_dereference(bond->current_arp_slave); |
| |
| /* We 'trust' the received ARP enough to validate it if: |
| * |
| * (a) the slave receiving the ARP is active (which includes the |
| * current ARP slave, if any), or |
| * |
| * (b) the receiving slave isn't active, but there is a currently |
| * active slave and it received valid arp reply(s) after it became |
| * the currently active slave, or |
| * |
| * (c) there is an ARP slave that sent an ARP during the prior ARP |
| * interval, and we receive an ARP reply on any slave. We accept |
| * these because switch FDB update delays may deliver the ARP |
| * reply to a slave other than the sender of the ARP request. |
| * |
| * Note: for (b), backup slaves are receiving the broadcast ARP |
| * request, not a reply. This request passes from the sending |
| * slave through the L2 switch(es) to the receiving slave. Since |
| * this is checking the request, sip/tip are swapped for |
| * validation. |
| * |
| * This is done to avoid endless looping when we can't reach the |
| * arp_ip_target and fool ourselves with our own arp requests. |
| */ |
| if (bond_is_active_slave(slave)) |
| bond_validate_arp(bond, slave, sip, tip); |
| else if (curr_active_slave && |
| time_after(slave_last_rx(bond, curr_active_slave), |
| curr_active_slave->last_link_up)) |
| bond_validate_arp(bond, slave, tip, sip); |
| else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && |
| bond_time_in_interval(bond, |
| dev_trans_start(curr_arp_slave->dev), 1)) |
| bond_validate_arp(bond, slave, sip, tip); |
| |
| out_unlock: |
| if (arp != (struct arphdr *)skb->data) |
| kfree(arp); |
| return RX_HANDLER_ANOTHER; |
| } |
| |
| /* function to verify if we're in the arp_interval timeslice, returns true if |
| * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + |
| * arp_interval/2) . the arp_interval/2 is needed for really fast networks. |
| */ |
| static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, |
| int mod) |
| { |
| int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); |
| |
| return time_in_range(jiffies, |
| last_act - delta_in_ticks, |
| last_act + mod * delta_in_ticks + delta_in_ticks/2); |
| } |
| |
| /* This function is called regularly to monitor each slave's link |
| * ensuring that traffic is being sent and received when arp monitoring |
| * is used in load-balancing mode. if the adapter has been dormant, then an |
| * arp is transmitted to generate traffic. see activebackup_arp_monitor for |
| * arp monitoring in active backup mode. |
| */ |
| static void bond_loadbalance_arp_mon(struct bonding *bond) |
| { |
| struct slave *slave, *oldcurrent; |
| struct list_head *iter; |
| int do_failover = 0, slave_state_changed = 0; |
| |
| if (!bond_has_slaves(bond)) |
| goto re_arm; |
| |
| rcu_read_lock(); |
| |
| oldcurrent = rcu_dereference(bond->curr_active_slave); |
| /* see if any of the previous devices are up now (i.e. they have |
| * xmt and rcv traffic). the curr_active_slave does not come into |
| * the picture unless it is null. also, slave->last_link_up is not |
| * needed here because we send an arp on each slave and give a slave |
| * as long as it needs to get the tx/rx within the delta. |
| * TODO: what about up/down delay in arp mode? it wasn't here before |
| * so it can wait |
| */ |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| unsigned long trans_start = dev_trans_start(slave->dev); |
| |
| bond_propose_link_state(slave, BOND_LINK_NOCHANGE); |
| |
| if (slave->link != BOND_LINK_UP) { |
| if (bond_time_in_interval(bond, trans_start, 1) && |
| bond_time_in_interval(bond, slave->last_rx, 1)) { |
| |
| bond_propose_link_state(slave, BOND_LINK_UP); |
| slave_state_changed = 1; |
| |
| /* primary_slave has no meaning in round-robin |
| * mode. the window of a slave being up and |
| * curr_active_slave being null after enslaving |
| * is closed. |
| */ |
| if (!oldcurrent) { |
| netdev_info(bond->dev, "link status definitely up for interface %s\n", |
| slave->dev->name); |
| do_failover = 1; |
| } else { |
| netdev_info(bond->dev, "interface %s is now up\n", |
| slave->dev->name); |
| } |
| } |
| } else { |
| /* slave->link == BOND_LINK_UP */ |
| |
| /* not all switches will respond to an arp request |
| * when the source ip is 0, so don't take the link down |
| * if we don't know our ip yet |
| */ |
| if (!bond_time_in_interval(bond, trans_start, 2) || |
| !bond_time_in_interval(bond, slave->last_rx, 2)) { |
| |
| bond_propose_link_state(slave, BOND_LINK_DOWN); |
| slave_state_changed = 1; |
| |
| if (slave->link_failure_count < UINT_MAX) |
| slave->link_failure_count++; |
| |
| netdev_info(bond->dev, "interface %s is now down\n", |
| 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 (bond_slave_is_up(slave)) |
| bond_arp_send_all(bond, slave); |
| } |
| |
| rcu_read_unlock(); |
| |
| if (do_failover || slave_state_changed) { |
| if (!rtnl_trylock()) |
| goto re_arm; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| if (slave->link_new_state != BOND_LINK_NOCHANGE) |
| slave->link = slave->link_new_state; |
| } |
| |
| if (slave_state_changed) { |
| bond_slave_state_change(bond); |
| if (BOND_MODE(bond) == BOND_MODE_XOR) |
| bond_update_slave_arr(bond, NULL); |
| } |
| if (do_failover) { |
| block_netpoll_tx(); |
| bond_select_active_slave(bond); |
| unblock_netpoll_tx(); |
| } |
| rtnl_unlock(); |
| } |
| |
| re_arm: |
| if (bond->params.arp_interval) |
| queue_delayed_work(bond->wq, &bond->arp_work, |
| msecs_to_jiffies(bond->params.arp_interval)); |
| } |
| |
| /* Called to inspect slaves for active-backup mode ARP monitor link state |
| * changes. Sets proposed link state in slaves to specify what action |
| * should take place for the slave. Returns 0 if no changes are found, >0 |
| * if changes to link states must be committed. |
| * |
| * Called with rcu_read_lock held. |
| */ |
| static int bond_ab_arp_inspect(struct bonding *bond) |
| { |
| unsigned long trans_start, last_rx; |
| struct list_head *iter; |
| struct slave *slave; |
| int commit = 0; |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| bond_propose_link_state(slave, BOND_LINK_NOCHANGE); |
| last_rx = slave_last_rx(bond, slave); |
| |
| if (slave->link != BOND_LINK_UP) { |
| if (bond_time_in_interval(bond, last_rx, 1)) { |
| bond_propose_link_state(slave, BOND_LINK_UP); |
| commit++; |
| } else if (slave->link == BOND_LINK_BACK) { |
| bond_propose_link_state(slave, BOND_LINK_FAIL); |
| commit++; |
| } |
| continue; |
| } |
| |
| /* Give slaves 2*delta after being enslaved or made |
| * active. This avoids bouncing, as the last receive |
| * times need a full ARP monitor cycle to be updated. |
| */ |
| if (bond_time_in_interval(bond, slave->last_link_up, 2)) |
| continue; |
| |
| /* Backup slave is down if: |
| * - No current_arp_slave AND |
| * - more than 3*delta since last receive AND |
| * - the bond has an IP address |
| * |
| * Note: a non-null current_arp_slave indicates |
| * the curr_active_slave went down and we are |
| * searching for a new one; under this condition |
| * we only take the curr_active_slave down - this |
| * gives each slave a chance to tx/rx traffic |
| * before being taken out |
| */ |
| if (!bond_is_active_slave(slave) && |
| !rcu_access_pointer(bond->current_arp_slave) && |
| !bond_time_in_interval(bond, last_rx, 3)) { |
| bond_propose_link_state(slave, BOND_LINK_DOWN); |
| commit++; |
| } |
| |
| /* Active slave is down if: |
| * - more than 2*delta since transmitting OR |
| * - (more than 2*delta since receive AND |
| * the bond has an IP address) |
| */ |
| trans_start = dev_trans_start(slave->dev); |
| if (bond_is_active_slave(slave) && |
| (!bond_time_in_interval(bond, trans_start, 2) || |
| !bond_time_in_interval(bond, last_rx, 2))) { |
| bond_propose_link_state(slave, BOND_LINK_DOWN); |
| commit++; |
| } |
| } |
| |
| return commit; |
| } |
| |
| /* Called to commit link state changes noted by inspection step of |
| * active-backup mode ARP monitor. |
| * |
| * Called with RTNL hold. |
| */ |
| static void bond_ab_arp_commit(struct bonding *bond) |
| { |
| unsigned long trans_start; |
| struct list_head *iter; |
| struct slave *slave; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| switch (slave->link_new_state) { |
| case BOND_LINK_NOCHANGE: |
| continue; |
| |
| case BOND_LINK_UP: |
| trans_start = dev_trans_start(slave->dev); |
| if (rtnl_dereference(bond->curr_active_slave) != slave || |
| (!rtnl_dereference(bond->curr_active_slave) && |
| bond_time_in_interval(bond, trans_start, 1))) { |
| struct slave *current_arp_slave; |
| |
| current_arp_slave = rtnl_dereference(bond->current_arp_slave); |
| bond_set_slave_link_state(slave, BOND_LINK_UP, |
| BOND_SLAVE_NOTIFY_NOW); |
| if (current_arp_slave) { |
| bond_set_slave_inactive_flags( |
| current_arp_slave, |
| BOND_SLAVE_NOTIFY_NOW); |
| RCU_INIT_POINTER(bond->current_arp_slave, NULL); |
| } |
| |
| netdev_info(bond->dev, "link status definitely up for interface %s\n", |
| slave->dev->name); |
| |
| if (!rtnl_dereference(bond->curr_active_slave) || |
| slave == rtnl_dereference(bond->primary_slave)) |
| goto do_failover; |
| |
| } |
| |
| continue; |
| |
| case BOND_LINK_DOWN: |
| if (slave->link_failure_count < UINT_MAX) |
| slave->link_failure_count++; |
| |
| bond_set_slave_link_state(slave, BOND_LINK_DOWN, |
| BOND_SLAVE_NOTIFY_NOW); |
| bond_set_slave_inactive_flags(slave, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", |
| slave->dev->name); |
| |
| if (slave == rtnl_dereference(bond->curr_active_slave)) { |
| RCU_INIT_POINTER(bond->current_arp_slave, NULL); |
| goto do_failover; |
| } |
| |
| continue; |
| |
| case BOND_LINK_FAIL: |
| bond_set_slave_link_state(slave, BOND_LINK_FAIL, |
| BOND_SLAVE_NOTIFY_NOW); |
| bond_set_slave_inactive_flags(slave, |
| BOND_SLAVE_NOTIFY_NOW); |
| |
| /* A slave has just been enslaved and has become |
| * the current active slave. |
| */ |
| if (rtnl_dereference(bond->curr_active_slave)) |
| RCU_INIT_POINTER(bond->current_arp_slave, NULL); |
| continue; |
| |
| default: |
| netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", |
| slave->link_new_state, slave->dev->name); |
| continue; |
| } |
| |
| do_failover: |
| block_netpoll_tx(); |
| bond_select_active_slave(bond); |
| unblock_netpoll_tx(); |
| } |
| |
| bond_set_carrier(bond); |
| } |
| |
| /* Send ARP probes for active-backup mode ARP monitor. |
| * |
| * Called with rcu_read_lock held. |
| */ |
| static bool bond_ab_arp_probe(struct bonding *bond) |
| { |
| struct slave *slave, *before = NULL, *new_slave = NULL, |
| *curr_arp_slave = rcu_dereference(bond->current_arp_slave), |
| *curr_active_slave = rcu_dereference(bond->curr_active_slave); |
| struct list_head *iter; |
| bool found = false; |
| bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; |
| |
| if (curr_arp_slave && curr_active_slave) |
| netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", |
| curr_arp_slave->dev->name, |
| curr_active_slave->dev->name); |
| |
| if (curr_active_slave) { |
| bond_arp_send_all(bond, curr_active_slave); |
| return should_notify_rtnl; |
| } |
| |
| /* if we don't have a curr_active_slave, search for the next available |
| * backup slave from the current_arp_slave and make it the candidate |
| * for becoming the curr_active_slave |
| */ |
| |
| if (!curr_arp_slave) { |
| curr_arp_slave = bond_first_slave_rcu(bond); |
| if (!curr_arp_slave) |
| return should_notify_rtnl; |
| } |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| if (!found && !before && bond_slave_is_up(slave)) |
| before = slave; |
| |
| if (found && !new_slave && bond_slave_is_up(slave)) |
| new_slave = slave; |
| /* if the link state is up at this point, we |
| * mark it down - this can happen if we have |
| * simultaneous link failures and |
| * reselect_active_interface doesn't make this |
| * one the current slave so it is still marked |
| * up when it is actually down |
| */ |
| if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { |
| bond_set_slave_link_state(slave, BOND_LINK_DOWN, |
| BOND_SLAVE_NOTIFY_LATER); |
| if (slave->link_failure_count < UINT_MAX) |
| slave->link_failure_count++; |
| |
| bond_set_slave_inactive_flags(slave, |
| BOND_SLAVE_NOTIFY_LATER); |
| |
| netdev_info(bond->dev, "backup interface %s is now down\n", |
| slave->dev->name); |
| } |
| if (slave == curr_arp_slave) |
| found = true; |
| } |
| |
| if (!new_slave && before) |
| new_slave = before; |
| |
| if (!new_slave) |
| goto check_state; |
| |
| bond_set_slave_link_state(new_slave, BOND_LINK_BACK, |
| BOND_SLAVE_NOTIFY_LATER); |
| bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); |
| bond_arp_send_all(bond, new_slave); |
| new_slave->last_link_up = jiffies; |
| rcu_assign_pointer(bond->current_arp_slave, new_slave); |
| |
| check_state: |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| if (slave->should_notify || slave->should_notify_link) { |
| should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; |
| break; |
| } |
| } |
| return should_notify_rtnl; |
| } |
| |
| static void bond_activebackup_arp_mon(struct bonding *bond) |
| { |
| bool should_notify_peers = false; |
| bool should_notify_rtnl = false; |
| int delta_in_ticks; |
| |
| delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); |
| |
| if (!bond_has_slaves(bond)) |
| goto re_arm; |
| |
| rcu_read_lock(); |
| |
| should_notify_peers = bond_should_notify_peers(bond); |
| |
| if (bond_ab_arp_inspect(bond)) { |
| rcu_read_unlock(); |
| |
| /* Race avoidance with bond_close flush of workqueue */ |
| if (!rtnl_trylock()) { |
| delta_in_ticks = 1; |
| should_notify_peers = false; |
| goto re_arm; |
| } |
| |
| bond_ab_arp_commit(bond); |
| |
| rtnl_unlock(); |
| rcu_read_lock(); |
| } |
| |
| should_notify_rtnl = bond_ab_arp_probe(bond); |
| rcu_read_unlock(); |
| |
| re_arm: |
| if (bond->params.arp_interval) |
| queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); |
| |
| if (should_notify_peers || should_notify_rtnl) { |
| if (!rtnl_trylock()) |
| return; |
| |
| if (should_notify_peers) |
| call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, |
| bond->dev); |
| if (should_notify_rtnl) { |
| bond_slave_state_notify(bond); |
| bond_slave_link_notify(bond); |
| } |
| |
| rtnl_unlock(); |
| } |
| } |
| |
| static void bond_arp_monitor(struct work_struct *work) |
| { |
| struct bonding *bond = container_of(work, struct bonding, |
| arp_work.work); |
| |
| if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) |
| bond_activebackup_arp_mon(bond); |
| else |
| bond_loadbalance_arp_mon(bond); |
| } |
| |
| /*-------------------------- netdev event handling --------------------------*/ |
| |
| /* Change device name */ |
| static int bond_event_changename(struct bonding *bond) |
| { |
| bond_remove_proc_entry(bond); |
| bond_create_proc_entry(bond); |
| |
| bond_debug_reregister(bond); |
| |
| return NOTIFY_DONE; |
| } |
| |
| static int bond_master_netdev_event(unsigned long event, |
| struct net_device *bond_dev) |
| { |
| struct bonding *event_bond = netdev_priv(bond_dev); |
| |
| switch (event) { |
| case NETDEV_CHANGENAME: |
| return bond_event_changename(event_bond); |
| case NETDEV_UNREGISTER: |
| bond_remove_proc_entry(event_bond); |
| break; |
| case NETDEV_REGISTER: |
| bond_create_proc_entry(event_bond); |
| break; |
| case NETDEV_NOTIFY_PEERS: |
| if (event_bond->send_peer_notif) |
| event_bond->send_peer_notif--; |
| break; |
| default: |
| break; |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| static int bond_slave_netdev_event(unsigned long event, |
| struct net_device *slave_dev) |
| { |
| struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; |
| struct bonding *bond; |
| struct net_device *bond_dev; |
| |
| /* A netdev event can be generated while enslaving a device |
| * before netdev_rx_handler_register is called in which case |
| * slave will be NULL |
| */ |
| if (!slave) |
| return NOTIFY_DONE; |
| bond_dev = slave->bond->dev; |
| bond = slave->bond; |
| primary = rtnl_dereference(bond->primary_slave); |
| |
| switch (event) { |
| case NETDEV_UNREGISTER: |
| if (bond_dev->type != ARPHRD_ETHER) |
| bond_release_and_destroy(bond_dev, slave_dev); |
| else |
| __bond_release_one(bond_dev, slave_dev, false, true); |
| |