--- /dev/null
+/*
+ * 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_keys.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, "803.ad aggregation selection logic; "
+ "0 for stable (default), 1 for bandwidth, "
+ "2 for count");
+module_param(min_links, int, 0);
+MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
+
+module_param(xmit_hash_policy, charp, 0);
+MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
+ "0 for layer 2 (default), 1 for layer 3+4, "
+ "2 for layer 2+3, 3 for encap layer 2+3, "
+ "4 for encap layer 3+4");
+module_param(arp_interval, int, 0);
+MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
+module_param_array(arp_ip_target, charp, NULL, 0);
+MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
+module_param(arp_validate, charp, 0);
+MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
+ "0 for none (default), 1 for active, "
+ "2 for backup, 3 for all");
+module_param(arp_all_targets, charp, 0);
+MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
+module_param(fail_over_mac, charp, 0);
+MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
+ "the same MAC; 0 for none (default), "
+ "1 for active, 2 for follow");
+module_param(all_slaves_active, int, 0);
+MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
+ "by setting active flag for all slaves; "
+ "0 for never (default), 1 for always.");
+module_param(resend_igmp, int, 0);
+MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
+ "link failure");
+module_param(packets_per_slave, int, 0);
+MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
+ "mode; 0 for a random slave, 1 packet per "
+ "slave (default), >1 packets per slave.");
+module_param(lp_interval, uint, 0);
+MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
+ "the bonding driver sends learning packets to "
+ "each slaves peer switch. The default is 1.");
+
+/*----------------------------- Global variables ----------------------------*/
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+atomic_t netpoll_block_tx = ATOMIC_INIT(0);
+#endif
+
+int bond_net_id __read_mostly;
+
+static __be32 arp_target[BOND_MAX_ARP_TARGETS];
+static int arp_ip_count;
+static int bond_mode = BOND_MODE_ROUNDROBIN;
+static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
+static int lacp_fast;
+
+/*-------------------------- Forward declarations ---------------------------*/
+
+static int bond_init(struct net_device *bond_dev);
+static void bond_uninit(struct net_device *bond_dev);
+static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
+ struct rtnl_link_stats64 *stats);
+static void bond_slave_arr_handler(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->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
+
+ if (unlikely(netpoll_tx_running(bond->dev)))
+ bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
+ else
+ dev_queue_xmit(skb);
+}
+
+/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
+ * We don't protect the slave list iteration with a lock because:
+ * a. This operation is performed in IOCTL context,
+ * b. The operation is protected by the RTNL semaphore in the 8021q code,
+ * c. Holding a lock with BH disabled while directly calling a base driver
+ * entry point is generally a BAD idea.
+ *
+ * The design of synchronization/protection for this operation in the 8021q
+ * module is good for one or more VLAN devices over a single physical device
+ * and cannot be extended for a teaming solution like bonding, so there is a
+ * potential race condition here where a net device from the vlan group might
+ * be referenced (either by a base driver or the 8021q code) while it is being
+ * removed from the system. However, it turns out we're not making matters
+ * worse, and if it works for regular VLAN usage it will work here too.
+*/
+
+/**
+ * bond_vlan_rx_add_vid - Propagates adding an id to slaves
+ * @bond_dev: bonding net device that got called
+ * @vid: vlan id being added
+ */
+static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
+ __be16 proto, u16 vid)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave, *rollback_slave;
+ struct list_head *iter;
+ int res;
+
+ bond_for_each_slave(bond, slave, iter) {
+ res = vlan_vid_add(slave->dev, proto, vid);
+ if (res)
+ goto unwind;
+ }
+
+ return 0;
+
+unwind:
+ /* unwind to the slave that failed */
+ bond_for_each_slave(bond, rollback_slave, iter) {
+ if (rollback_slave == slave)
+ break;
+
+ vlan_vid_del(rollback_slave->dev, proto, vid);
+ }
+
+ return res;
+}
+
+/**
+ * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
+ * @bond_dev: bonding net device that got called
+ * @vid: vlan id being removed
+ */
+static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
+ __be16 proto, u16 vid)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct list_head *iter;
+ struct slave *slave;
+
+ bond_for_each_slave(bond, slave, iter)
+ vlan_vid_del(slave->dev, proto, vid);
+
+ if (bond_is_lb(bond))
+ bond_alb_clear_vlan(bond, vid);
+
+ return 0;
+}
+
+/*------------------------------- Link status -------------------------------*/
+
+/* Set the carrier state for the master according to the state of its
+ * slaves. If any slaves are up, the master is up. In 802.3ad mode,
+ * do special 802.3ad magic.
+ *
+ * Returns zero if carrier state does not change, nonzero if it does.
+ */
+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.
+ */
+static void bond_update_speed_duplex(struct slave *slave)
+{
+ struct net_device *slave_dev = slave->dev;
+ struct ethtool_cmd ecmd;
+ u32 slave_speed;
+ int res;
+
+ slave->speed = SPEED_UNKNOWN;
+ slave->duplex = DUPLEX_UNKNOWN;
+
+ res = __ethtool_get_settings(slave_dev, &ecmd);
+ if (res < 0)
+ return;
+
+ slave_speed = ethtool_cmd_speed(&ecmd);
+ if (slave_speed == 0 || slave_speed == ((__u32) -1))
+ return;
+
+ switch (ecmd.duplex) {
+ case DUPLEX_FULL:
+ case DUPLEX_HALF:
+ break;
+ default:
+ return;
+ }
+
+ slave->speed = slave_speed;
+ slave->duplex = ecmd.duplex;
+
+ return;
+}
+
+const char *bond_slave_link_status(s8 link)
+{
+ switch (link) {
+ case BOND_LINK_UP:
+ return "up";
+ case BOND_LINK_FAIL:
+ return "going down";
+ case BOND_LINK_DOWN:
+ return "down";
+ case BOND_LINK_BACK:
+ return "going back";
+ default:
+ return "unknown";
+ }
+}
+
+/* if <dev> supports MII link status reporting, check its link status.
+ *
+ * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
+ * depending upon the setting of the use_carrier parameter.
+ *
+ * Return either BMSR_LSTATUS, meaning that the link is up (or we
+ * can't tell and just pretend it is), or 0, meaning that the link is
+ * down.
+ *
+ * If reporting is non-zero, instead of faking link up, return -1 if
+ * both ETHTOOL and MII ioctls fail (meaning the device does not
+ * support them). If use_carrier is set, return whatever it says.
+ * It'd be nice if there was a good way to tell if a driver supports
+ * netif_carrier, but there really isn't.
+ */
+static int bond_check_dev_link(struct bonding *bond,
+ struct net_device *slave_dev, int reporting)
+{
+ const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
+ int (*ioctl)(struct net_device *, struct ifreq *, int);
+ struct ifreq ifr;
+ struct mii_ioctl_data *mii;
+
+ if (!reporting && !netif_running(slave_dev))
+ return 0;
+
+ if (bond->params.use_carrier)
+ return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
+
+ /* Try to get link status using Ethtool first. */
+ if (slave_dev->ethtool_ops->get_link)
+ return slave_dev->ethtool_ops->get_link(slave_dev) ?
+ BMSR_LSTATUS : 0;
+
+ /* Ethtool can't be used, fallback to MII ioctls. */
+ ioctl = slave_ops->ndo_do_ioctl;
+ if (ioctl) {
+ /* TODO: set pointer to correct ioctl on a per team member
+ * bases to make this more efficient. that is, once
+ * we determine the correct ioctl, we will always
+ * call it and not the others for that team
+ * member.
+ */
+
+ /* We cannot assume that SIOCGMIIPHY will also read a
+ * register; not all network drivers (e.g., e100)
+ * support that.
+ */
+
+ /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
+ strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
+ mii = if_mii(&ifr);
+ if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
+ mii->reg_num = MII_BMSR;
+ if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
+ return mii->val_out & BMSR_LSTATUS;
+ }
+ }
+
+ /* If reporting, report that either there's no dev->do_ioctl,
+ * or both SIOCGMIIREG and get_link failed (meaning that we
+ * cannot report link status). If not reporting, pretend
+ * we're ok.
+ */
+ return reporting ? -1 : BMSR_LSTATUS;
+}
+
+/*----------------------------- Multicast list ------------------------------*/
+
+/* Push the promiscuity flag down to appropriate slaves */
+static int bond_set_promiscuity(struct bonding *bond, int inc)
+{
+ struct list_head *iter;
+ int err = 0;
+
+ if (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->addr_len=%d\n",
+ bond_dev, slave_dev, slave_dev->addr_len);
+ memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
+ bond_dev->addr_assign_type = NET_ADDR_STOLEN;
+ call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
+}
+
+/* bond_do_fail_over_mac
+ *
+ * Perform special MAC address swapping for fail_over_mac settings
+ *
+ * Called with RTNL
+ */
+static void bond_do_fail_over_mac(struct bonding *bond,
+ struct slave *new_active,
+ struct slave *old_active)
+{
+ u8 tmp_mac[ETH_ALEN];
+ struct sockaddr saddr;
+ 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) {
+ ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
+ ether_addr_copy(saddr.sa_data,
+ old_active->dev->dev_addr);
+ saddr.sa_family = new_active->dev->type;
+ } else {
+ ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
+ saddr.sa_family = bond->dev->type;
+ }
+
+ rv = dev_set_mac_address(new_active->dev, &saddr);
+ if (rv) {
+ netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
+ -rv, new_active->dev->name);
+ goto out;
+ }
+
+ if (!old_active)
+ goto out;
+
+ ether_addr_copy(saddr.sa_data, tmp_mac);
+ saddr.sa_family = old_active->dev->type;
+
+ rv = dev_set_mac_address(old_active->dev, &saddr);
+ if (rv)
+ 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 bool bond_should_change_active(struct bonding *bond)
+{
+ struct slave *prim = rtnl_dereference(bond->primary_slave);
+ struct slave *curr = rtnl_dereference(bond->curr_active_slave);
+
+ if (!prim || !curr || curr->link != BOND_LINK_UP)
+ return true;
+ if (bond->force_primary) {
+ bond->force_primary = false;
+ return true;
+ }
+ if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
+ (prim->speed < curr->speed ||
+ (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
+ return false;
+ if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
+ return false;
+ return true;
+}
+
+/**
+ * find_best_interface - select the best available slave to be the active one
+ * @bond: our bonding struct
+ */
+static struct slave *bond_find_best_slave(struct bonding *bond)
+{
+ struct slave *slave, *bestslave = NULL, *primary;
+ struct list_head *iter;
+ int mintime = bond->params.updelay;
+
+ primary = rtnl_dereference(bond->primary_slave);
+ if (primary && primary->link == BOND_LINK_UP &&
+ bond_should_change_active(bond))
+ return primary;
+
+ 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 ||
+ 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);
+
+ 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;
+ struct netpoll_info *ni;
+ const struct net_device_ops *ops;
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD)
+ if (bond_3ad_get_active_agg_info(bond, &ad_info))
+ return;
+
+ rcu_read_lock_bh();
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ ops = slave->dev->netdev_ops;
+ if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
+ 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;
+ }
+
+ ni = rcu_dereference_bh(slave->dev->npinfo);
+ if (down_trylock(&ni->dev_lock))
+ continue;
+ ops->ndo_poll_controller(slave->dev);
+ up(&ni->dev_lock);
+ }
+ rcu_read_unlock_bh();
+}
+
+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;
+
+ /* If any slave has the offload feature flag set,
+ * set the offload flag on the bond.
+ */
+ mask = features | NETIF_F_HW_SWITCH_OFFLOAD;
+
+ features &= ~NETIF_F_ONE_FOR_ALL;
+ features |= NETIF_F_ALL_FOR_ALL;
+
+ bond_for_each_slave(bond, slave, iter) {
+ features = netdev_increment_features(features,
+ slave->dev->features,
+ mask);
+ }
+ features = netdev_add_tso_features(features, mask);
+
+ return features;
+}
+
+#define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
+ NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
+ NETIF_F_HIGHDMA | NETIF_F_LRO)
+
+#define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
+ NETIF_F_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);
+ }
+
+done:
+ bond_dev->vlan_features = vlan_features;
+ bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
+ bond_dev->hard_header_len = max_hard_header_len;
+ bond_dev->gso_max_segs = gso_max_segs;
+ netif_set_gso_max_size(bond_dev, gso_max_size);
+
+ 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->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 = ACCESS_ONCE(bond->recv_probe);
+ if (recv_probe) {
+ ret = recv_probe(skb, bond, slave);
+ if (ret == RX_HANDLER_CONSUMED) {
+ consume_skb(skb);
+ return ret;
+ }
+ }
+
+ if (bond_should_deliver_exact_match(skb, slave, bond)) {
+ return RX_HANDLER_EXACT;
+ }
+
+ skb->dev = bond->dev;
+
+ if (BOND_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;
+ }
+ ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
+ }
+
+ return ret;
+}
+
+static int bond_master_upper_dev_link(struct net_device *bond_dev,
+ struct net_device *slave_dev,
+ struct slave *slave)
+{
+ int err;
+
+ err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
+ if (err)
+ return err;
+ slave_dev->flags |= IFF_SLAVE;
+ rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
+ return 0;
+}
+
+static void bond_upper_dev_unlink(struct net_device *bond_dev,
+ struct net_device *slave_dev)
+{
+ netdev_upper_dev_unlink(slave_dev, bond_dev);
+ slave_dev->flags &= ~IFF_SLAVE;
+ rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
+}
+
+static struct slave *bond_alloc_slave(struct bonding *bond)
+{
+ struct slave *slave = NULL;
+
+ slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
+ if (!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)) {
+ kfree(slave);
+ return NULL;
+ }
+ }
+ return slave;
+}
+
+static void bond_free_slave(struct slave *slave)
+{
+ struct bonding *bond = bond_get_bond_by_slave(slave);
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD)
+ kfree(SLAVE_AD_INFO(slave));
+
+ kfree(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(struct net_device *dev,
+ struct netdev_bonding_info *info)
+{
+ rtnl_lock();
+ netdev_bonding_info_change(dev, info);
+ rtnl_unlock();
+}
+
+static void bond_netdev_notify_work(struct work_struct *_work)
+{
+ struct netdev_notify_work *w =
+ container_of(_work, struct netdev_notify_work, work.work);
+
+ bond_netdev_notify(w->dev, &w->bonding_info);
+ dev_put(w->dev);
+ kfree(w);
+}
+
+void bond_queue_slave_event(struct slave *slave)
+{
+ struct bonding *bond = slave->bond;
+ struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
+
+ if (!nnw)
+ return;
+
+ dev_hold(slave->dev);
+ nnw->dev = slave->dev;
+ bond_fill_ifslave(slave, &nnw->bonding_info.slave);
+ bond_fill_ifbond(bond, &nnw->bonding_info.master);
+ INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
+
+ queue_delayed_work(slave->bond->wq, &nnw->work, 0);
+}
+
+/* enslave device <slave> to bond device <master> */
+int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
+ struct slave *new_slave = NULL, *prev_slave;
+ struct sockaddr addr;
+ int link_reporting;
+ int res = 0, i;
+
+ if (!bond->params.use_carrier &&
+ slave_dev->ethtool_ops->get_link == NULL &&
+ slave_ops->ndo_do_ioctl == NULL) {
+ netdev_warn(bond_dev, "no link monitoring support for %s\n",
+ slave_dev->name);
+ }
+
+ /* already enslaved */
+ if (slave_dev->flags & IFF_SLAVE) {
+ netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
+ return -EBUSY;
+ }
+
+ if (bond_dev == slave_dev) {
+ 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)) {
+ 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)) {
+ netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
+ slave_dev->name);
+ res = -EPERM;
+ goto err_undo_flags;
+ }
+
+ /* set bonding device ether type by slave - bonding netdevices are
+ * created with ether_setup, so when the slave type is not ARPHRD_ETHER
+ * there is a need to override some of the type dependent attribs/funcs.
+ *
+ * bond ether type mutual exclusion - don't allow slaves of dissimilar
+ * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
+ */
+ if (!bond_has_slaves(bond)) {
+ if (bond_dev->type != slave_dev->type) {
+ 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");
+ res = -EBUSY;
+ goto err_undo_flags;
+ }
+
+ /* Flush unicast and multicast addresses */
+ dev_uc_flush(bond_dev);
+ dev_mc_flush(bond_dev);
+
+ if (slave_dev->type != ARPHRD_ETHER)
+ bond_setup_by_slave(bond_dev, slave_dev);
+ else {
+ ether_setup(bond_dev);
+ bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ }
+
+ call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
+ bond_dev);
+ }
+ } else if (bond_dev->type != slave_dev->type) {
+ 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);
+ res = -EINVAL;
+ goto err_undo_flags;
+ }
+
+ if (slave_ops->ndo_set_mac_address == NULL) {
+ 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 {
+ 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);
+ if (!new_slave) {
+ res = -ENOMEM;
+ goto err_undo_flags;
+ }
+
+ new_slave->bond = bond;
+ new_slave->dev = slave_dev;
+ /* 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
+ */
+ ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
+
+ 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(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
+ addr.sa_family = slave_dev->type;
+ res = dev_set_mac_address(slave_dev, &addr);
+ if (res) {
+ netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
+ goto err_restore_mtu;
+ }
+ }
+
+ /* open the slave since the application closed it */
+ res = dev_open(slave_dev);
+ if (res) {
+ 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;
+ }
+
+ /* 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_close;
+ }
+
+ /* set allmulti level to new slave */
+ if (bond_dev->flags & IFF_ALLMULTI) {
+ res = dev_set_allmulti(slave_dev, 1);
+ if (res)
+ goto err_close;
+ }
+
+ netif_addr_lock_bh(bond_dev);
+
+ dev_mc_sync_multiple(slave_dev, bond_dev);
+ dev_uc_sync_multiple(slave_dev, bond_dev);
+
+ netif_addr_unlock_bh(bond_dev);
+ }
+
+ if (BOND_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);
+ }
+
+ 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;
+
+ bond_update_speed_duplex(new_slave);
+
+ new_slave->last_rx = jiffies -
+ (msecs_to_jiffies(bond->params.arp_interval) + 1);
+ for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
+ new_slave->target_last_arp_rx[i] = new_slave->last_rx;
+
+ if (bond->params.miimon && !bond->params.use_carrier) {
+ link_reporting = bond_check_dev_link(bond, slave_dev, 1);
+
+ if ((link_reporting == -1) && !bond->params.arp_interval) {
+ /* miimon is set but a bonded network driver
+ * does not support ETHTOOL/MII and
+ * arp_interval is not set. Note: if
+ * use_carrier is enabled, we will never go
+ * here (because netif_carrier is always
+ * supported); thus, we don't need to change
+ * the messages for netif_carrier.
+ */
+ 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 */
+ 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);
+ new_slave->delay = bond->params.updelay;
+ } else {
+ bond_set_slave_link_state(new_slave,
+ BOND_LINK_UP);
+ }
+ } else {
+ bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
+ }
+ } else if (bond->params.arp_interval) {
+ bond_set_slave_link_state(new_slave,
+ (netif_carrier_ok(slave_dev) ?
+ BOND_LINK_UP : BOND_LINK_DOWN));
+ } else {
+ bond_set_slave_link_state(new_slave, BOND_LINK_UP);
+ }
+
+ 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
+ slave_dev->npinfo = bond->dev->npinfo;
+ if (slave_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_dev, slave_dev, new_slave);
+ 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->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_uses_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_upper_unlink:
+ bond_upper_dev_unlink(bond_dev, slave_dev);
+
+err_unregister:
+ netdev_rx_handler_unregister(slave_dev);
+
+err_detach:
+ if (!bond_uses_primary(bond))
+ bond_hw_addr_flush(bond_dev, slave_dev);
+
+ 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:
+ slave_dev->priv_flags &= ~IFF_BONDING;
+ dev_close(slave_dev);
+
+err_restore_mac:
+ 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.
+ */
+ ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
+ addr.sa_family = slave_dev->type;
+ dev_set_mac_address(slave_dev, &addr);
+ }
+
+err_restore_mtu:
+ dev_set_mtu(slave_dev, new_slave->original_mtu);
+
+err_free:
+ bond_free_slave(new_slave);
+
+err_undo_flags:
+ /* Enslave of first slave has failed and we need to fix master's mac */
+ if (!bond_has_slaves(bond) &&
+ ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
+ eth_hw_addr_random(bond_dev);
+
+ return res;
+}
+
+/* Try to release the slave device <slave> from the bond device <master>
+ * It is legal to access curr_active_slave without a lock because all the function
+ * is 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)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave, *oldcurrent;
+ struct sockaddr addr;
+ int old_flags = bond_dev->flags;
+ netdev_features_t old_features = bond_dev->features;
+
+ /* slave is not a slave or master is not master of this slave */
+ if (!(slave_dev->flags & IFF_SLAVE) ||
+ !netdev_has_upper_dev(slave_dev, bond_dev)) {
+ 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_sysfs_slave_del(slave);
+
+ /* recompute stats just before removing the slave */
+ bond_get_stats(bond->dev, &bond->bond_stats);
+
+ bond_upper_dev_unlink(bond_dev, slave_dev);
+ /* unregister rx_handler early so bond_handle_frame wouldn't be called
+ * for this slave anymore.
+ */
+ netdev_rx_handler_unregister(slave_dev);
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD)
+ bond_3ad_unbind_slave(slave);
+
+ if (bond_mode_uses_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);
+ }
+
+ 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 */
+ ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
+ addr.sa_family = slave_dev->type;
+ dev_set_mac_address(slave_dev, &addr);
+ }
+
+ dev_set_mtu(slave_dev, slave->original_mtu);
+
+ slave_dev->priv_flags &= ~IFF_BONDING;
+
+ bond_free_slave(slave);
+
+ 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);
+}
+
+/* First release a slave and then destroy the bond if no more slaves are left.
+ * Must be under rtnl_lock when this function is called.
+ */
+static int bond_release_and_destroy(struct net_device *bond_dev,
+ struct net_device *slave_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ int ret;
+
+ ret = bond_release(bond_dev, slave_dev);
+ if (ret == 0 && !bond_has_slaves(bond)) {
+ bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
+ netdev_info(bond_dev, "Destroying bond %s\n",
+ bond_dev->name);
+ unregister_netdevice(bond_dev);
+ }
+ return ret;
+}
+
+static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ bond_fill_ifbond(bond, info);
+ return 0;
+}
+
+static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct list_head *iter;
+ int i = 0, res = -ENODEV;
+ struct slave *slave;
+
+ bond_for_each_slave(bond, slave, iter) {
+ if (i++ == (int)info->slave_id) {
+ res = 0;
+ 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) {
+ slave->new_link = BOND_LINK_NOCHANGE;
+
+ link_state = bond_check_dev_link(bond, slave->dev, 0);
+
+ switch (slave->link) {
+ case BOND_LINK_UP:
+ if (link_state)
+ continue;
+
+ bond_set_slave_link_state(slave, BOND_LINK_FAIL);
+ 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_set_slave_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);
+ continue;
+ }
+
+ if (slave->delay <= 0) {
+ slave->new_link = BOND_LINK_DOWN;
+ commit++;
+ continue;
+ }
+
+ slave->delay--;
+ break;
+
+ case BOND_LINK_DOWN:
+ if (!link_state)
+ continue;
+
+ bond_set_slave_link_state(slave, BOND_LINK_BACK);
+ 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_set_slave_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);
+
+ continue;
+ }
+
+ if (ignore_updelay)
+ slave->delay = 0;
+
+ if (slave->delay <= 0) {
+ slave->new_link = BOND_LINK_UP;
+ commit++;
+ ignore_updelay = false;
+ continue;
+ }
+
+ slave->delay--;
+ break;
+ }
+ }
+
+ return commit;
+}
+
+static void bond_miimon_commit(struct bonding *bond)
+{
+ struct list_head *iter;
+ struct slave *slave, *primary;
+
+ bond_for_each_slave(bond, slave, iter) {
+ switch (slave->new_link) {
+ case BOND_LINK_NOCHANGE:
+ continue;
+
+ case BOND_LINK_UP:
+ bond_set_slave_link_state(slave, BOND_LINK_UP);
+ 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);
+ } else if (slave != primary) {
+ /* prevent it from being the active one */
+ bond_set_backup_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");
+
+ /* notify ad that the link status has changed */
+ if (BOND_MODE(bond) == BOND_MODE_8023AD)
+ bond_3ad_handle_link_change(slave, BOND_LINK_UP);
+
+ if (bond_is_lb(bond))
+ bond_alb_handle_link_change(bond, slave,
+ BOND_LINK_UP);
+
+ if (BOND_MODE(bond) == BOND_MODE_XOR)
+ bond_update_slave_arr(bond, NULL);
+
+ 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);
+
+ 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);
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD)
+ bond_3ad_handle_link_change(slave,
+ BOND_LINK_DOWN);
+
+ if (bond_is_lb(bond))
+ bond_alb_handle_link_change(bond, slave,
+ BOND_LINK_DOWN);
+
+ if (BOND_MODE(bond) == BOND_MODE_XOR)
+ bond_update_slave_arr(bond, NULL);
+
+ 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->new_link, slave->dev->name);
+ slave->new_link = 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;
+
+ delay = msecs_to_jiffies(bond->params.miimon);
+
+ if (!bond_has_slaves(bond))
+ goto re_arm;
+
+ rcu_read_lock();
+
+ should_notify_peers = bond_should_notify_peers(bond);
+
+ if (bond_miimon_inspect(bond)) {
+ rcu_read_unlock();
+
+ /* Race avoidance with bond_close cancel of workqueue */
+ if (!rtnl_trylock()) {
+ delay = 1;
+ should_notify_peers = false;
+ goto re_arm;
+ }
+
+ bond_miimon_commit(bond);
+
+ rtnl_unlock(); /* might sleep, hold no other locks */
+ } else
+ rcu_read_unlock();
+
+re_arm:
+ if (bond->params.miimon)
+ queue_delayed_work(bond->wq, &bond->mii_work, delay);
+
+ if (should_notify_peers) {
+ if (!rtnl_trylock())
+ return;
+ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
+ rtnl_unlock();
+ }
+}
+
+static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
+{
+ struct net_device *upper;
+ struct list_head *iter;
+ bool ret = false;
+
+ if (ip == bond_confirm_addr(bond->dev, 0, ip))
+ return true;
+
+ rcu_read_lock();
+ netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
+ if (ip == bond_confirm_addr(upper, 0, ip)) {
+ ret = true;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/* We go to the (large) trouble of VLAN tagging ARP frames because
+ * switches in VLAN mode (especially if ports are configured as
+ * "native" to a VLAN) might not pass non-tagged frames.
+ */
+static void bond_arp_send(struct net_device *slave_dev, int arp_op,
+ __be32 dest_ip, __be32 src_ip,
+ struct bond_vlan_tag *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 = kzalloc(sizeof(*tags) * (level + 1), 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;
+ unsigned char *arp_ptr;
+ __be32 sip, tip;
+ int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
+
+ if (!slave_do_arp_validate(bond, slave)) {
+ if ((slave_do_arp_validate_only(bond) && 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);
+
+ /* Backup slaves won't see the ARP reply, but do come through
+ * here for each ARP probe (so we swap the sip/tip to validate
+ * the probe). In a "redundant switch, common router" type of
+ * configuration, the ARP probe will (hopefully) travel from
+ * the active, through one switch, the router, then the other
+ * switch before reaching the backup.
+ *
+ * We 'trust' the arp requests if there is an active slave and
+ * it received valid arp reply(s) after it became active. This
+ * is done to avoid endless looping when we can't reach the
+ * arp_ip_target and fool ourselves with our own arp requests.
+ */
+
+ if (bond_is_active_slave(slave))
+ bond_validate_arp(bond, slave, sip, tip);
+ else if (curr_active_slave &&
+ time_after(slave_last_rx(bond, curr_active_slave),
+ curr_active_slave->last_link_up))
+ bond_validate_arp(bond, slave, tip, sip);
+
+out_unlock:
+ if (arp != (struct arphdr *)skb->data)
+ kfree(arp);
+ return RX_HANDLER_ANOTHER;
+}
+
+/* function to verify if we're in the arp_interval timeslice, returns true if
+ * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
+ * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
+ */
+static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
+ int mod)
+{
+ int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
+
+ return time_in_range(jiffies,
+ last_act - delta_in_ticks,
+ last_act + mod * delta_in_ticks + delta_in_ticks/2);
+}
+
+/* This function is called regularly to monitor each slave's link
+ * ensuring that traffic is being sent and received when arp monitoring
+ * is used in load-balancing mode. if the adapter has been dormant, then an
+ * arp is transmitted to generate traffic. see activebackup_arp_monitor for
+ * arp monitoring in active backup mode.
+ */
+static void bond_loadbalance_arp_mon(struct work_struct *work)
+{
+ struct bonding *bond = container_of(work, struct bonding,
+ arp_work.work);
+ struct slave *slave, *oldcurrent;
+ struct list_head *iter;
+ int do_failover = 0, slave_state_changed = 0;
+
+ if (!bond_has_slaves(bond))
+ goto re_arm;
+
+ rcu_read_lock();
+
+ oldcurrent = 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);
+
+ if (slave->link != BOND_LINK_UP) {
+ if (bond_time_in_interval(bond, trans_start, 1) &&
+ bond_time_in_interval(bond, slave->last_rx, 1)) {
+
+ slave->link = BOND_LINK_UP;
+ slave_state_changed = 1;
+
+ /* primary_slave has no meaning in round-robin
+ * mode. the window of a slave being up and
+ * curr_active_slave being null after enslaving
+ * is closed.
+ */
+ if (!oldcurrent) {
+ 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)) {
+
+ slave->link = 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;
+
+ 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 new_link in slaves to specify what action should take
+ * place for the slave. Returns 0 if no changes are found, >0 if changes
+ * to link states must be committed.
+ *
+ * Called with rcu_read_lock 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) {
+ slave->new_link = BOND_LINK_NOCHANGE;
+ last_rx = slave_last_rx(bond, slave);
+
+ if (slave->link != BOND_LINK_UP) {
+ if (bond_time_in_interval(bond, last_rx, 1)) {
+ slave->new_link = BOND_LINK_UP;
+ commit++;
+ }
+ continue;
+ }
+
+ /* Give slaves 2*delta after being enslaved or made
+ * active. This avoids bouncing, as the last receive
+ * times need a full ARP monitor cycle to be updated.
+ */
+ if (bond_time_in_interval(bond, slave->last_link_up, 2))
+ continue;
+
+ /* Backup slave is down if:
+ * - No current_arp_slave AND
+ * - more than 3*delta since last receive AND
+ * - the bond has an IP address
+ *
+ * Note: a non-null current_arp_slave indicates
+ * the curr_active_slave went down and we are
+ * searching for a new one; under this condition
+ * we only take the curr_active_slave down - this
+ * gives each slave a chance to tx/rx traffic
+ * before being taken out
+ */
+ if (!bond_is_active_slave(slave) &&
+ !rcu_access_pointer(bond->current_arp_slave) &&
+ !bond_time_in_interval(bond, last_rx, 3)) {
+ slave->new_link = BOND_LINK_DOWN;
+ commit++;
+ }
+
+ /* Active slave is down if:
+ * - more than 2*delta since transmitting OR
+ * - (more than 2*delta since receive AND
+ * the bond has an IP address)
+ */
+ trans_start = dev_trans_start(slave->dev);
+ if (bond_is_active_slave(slave) &&
+ (!bond_time_in_interval(bond, trans_start, 2) ||
+ !bond_time_in_interval(bond, last_rx, 2))) {
+ slave->new_link = BOND_LINK_DOWN;
+ commit++;
+ }
+ }
+
+ return commit;
+}
+
+/* Called to commit link state changes noted by inspection step of
+ * active-backup mode ARP monitor.
+ *
+ * Called with RTNL hold.
+ */
+static void bond_ab_arp_commit(struct bonding *bond)
+{
+ unsigned long trans_start;
+ struct list_head *iter;
+ struct slave *slave;
+
+ bond_for_each_slave(bond, slave, iter) {
+ switch (slave->new_link) {
+ case BOND_LINK_NOCHANGE:
+ continue;
+
+ case BOND_LINK_UP:
+ trans_start = dev_trans_start(slave->dev);
+ if (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);
+ 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_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;
+
+ default:
+ netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
+ slave->new_link, 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_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
+
+ 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);
+ 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_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
+ bond_arp_send_all(bond, new_slave);
+ new_slave->last_link_up = jiffies;
+ rcu_assign_pointer(bond->current_arp_slave, new_slave);
+
+check_state:
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ if (slave->should_notify) {
+ should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
+ break;
+ }
+ }
+ return should_notify_rtnl;
+}
+
+static void bond_activebackup_arp_mon(struct work_struct *work)
+{
+ struct bonding *bond = container_of(work, struct bonding,
+ arp_work.work);
+ bool should_notify_peers = false;
+ bool should_notify_rtnl = false;
+ int delta_in_ticks;
+
+ delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
+
+ if (!bond_has_slaves(bond))
+ goto re_arm;
+
+ rcu_read_lock();
+
+ should_notify_peers = bond_should_notify_peers(bond);
+
+ if (bond_ab_arp_inspect(bond)) {
+ rcu_read_unlock();
+
+ /* Race avoidance with bond_close flush of workqueue */
+ if (!rtnl_trylock()) {
+ delta_in_ticks = 1;
+ should_notify_peers = false;
+ goto re_arm;
+ }
+
+ bond_ab_arp_commit(bond);
+
+ rtnl_unlock();
+ rcu_read_lock();
+ }
+
+ should_notify_rtnl = bond_ab_arp_probe(bond);
+ rcu_read_unlock();
+
+re_arm:
+ if (bond->params.arp_interval)
+ queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
+
+ if (should_notify_peers || should_notify_rtnl) {
+ if (!rtnl_trylock())
+ return;
+
+ if (should_notify_peers)
+ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
+ bond->dev);
+ if (should_notify_rtnl)
+ bond_slave_state_notify(bond);
+
+ rtnl_unlock();
+ }
+}
+
+/*-------------------------- netdev event handling --------------------------*/
+
+/* Change device name */
+static int bond_event_changename(struct bonding *bond)
+{
+ bond_remove_proc_entry(bond);
+ bond_create_proc_entry(bond);
+
+ bond_debug_reregister(bond);
+
+ return NOTIFY_DONE;
+}
+
+static int bond_master_netdev_event(unsigned long event,
+ struct net_device *bond_dev)
+{
+ struct bonding *event_bond = netdev_priv(bond_dev);
+
+ switch (event) {
+ case NETDEV_CHANGENAME:
+ return bond_event_changename(event_bond);
+ case NETDEV_UNREGISTER:
+ bond_remove_proc_entry(event_bond);
+ break;
+ case NETDEV_REGISTER:
+ bond_create_proc_entry(event_bond);
+ break;
+ case NETDEV_NOTIFY_PEERS:
+ if (event_bond->send_peer_notif)
+ event_bond->send_peer_notif--;
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int bond_slave_netdev_event(unsigned long event,
+ struct net_device *slave_dev)
+{
+ struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
+ struct bonding *bond;
+ struct net_device *bond_dev;
+ u32 old_speed;
+ u8 old_duplex;
+
+ /* A netdev event can be generated while enslaving a device
+ * before netdev_rx_handler_register is called in which case
+ * slave will be NULL
+ */
+ if (!slave)
+ return NOTIFY_DONE;
+ bond_dev = slave->bond->dev;
+ bond = slave->bond;
+ 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(bond_dev, slave_dev);
+ break;
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ old_speed = slave->speed;
+ old_duplex = slave->duplex;
+
+ bond_update_speed_duplex(slave);
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+ if (old_speed != slave->speed)
+ bond_3ad_adapter_speed_changed(slave);
+ if (old_duplex != slave->duplex)
+ bond_3ad_adapter_duplex_changed(slave);
+ }
+ /* Fallthrough */
+ case NETDEV_DOWN:
+ /* Refresh slave-array if applicable!
+ * If the setup does not use miimon or arpmon (mode-specific!),
+ * then these events will not cause the slave-array to be
+ * refreshed. This will cause xmit to use a slave that is not
+ * usable. Avoid such situation by refeshing the array at these
+ * events. If these (miimon/arpmon) parameters are configured
+ * then array gets refreshed twice and that should be fine!
+ */
+ if (bond_mode_uses_xmit_hash(bond))
+ bond_update_slave_arr(bond, NULL);
+ break;
+ case NETDEV_CHANGEMTU:
+ /* TODO: Should slaves be allowed to
+ * independently alter their MTU? For
+ * an active-backup bond, slaves need
+ * not be the same type of device, so
+ * MTUs may vary. For other modes,
+ * slaves arguably should have the
+ * same MTUs. To do this, we'd need to
+ * take over the slave's change_mtu
+ * function for the duration of their
+ * servitude.
+ */
+ break;
+ case NETDEV_CHANGENAME:
+ /* we don't care if we don't have primary set */
+ if (!bond_uses_primary(bond) ||
+ !bond->params.primary[0])
+ break;
+
+ if (slave == primary) {
+ /* slave's name changed - he's no longer primary */
+ RCU_INIT_POINTER(bond->primary_slave, NULL);
+ } else if (!strcmp(slave_dev->name, bond->params.primary)) {
+ /* we have a new primary slave */
+ rcu_assign_pointer(bond->primary_slave, slave);
+ } else { /* we didn't change primary - exit */
+ break;
+ }
+
+ netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
+ primary ? slave_dev->name : "none");
+
+ block_netpoll_tx();
+ bond_select_active_slave(bond);
+ unblock_netpoll_tx();
+ break;
+ case NETDEV_FEAT_CHANGE:
+ bond_compute_features(bond);
+ break;
+ case NETDEV_RESEND_IGMP:
+ /* Propagate to master device */
+ call_netdevice_notifiers(event, slave->bond->dev);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+/* bond_netdev_event: handle netdev notifier chain events.
+ *
+ * This function receives events for the netdev chain. The caller (an
+ * ioctl handler calling blocking_notifier_call_chain) holds the necessary
+ * locks for us to safely manipulate the slave devices (RTNL lock,
+ * dev_probe_lock).
+ */
+static int bond_netdev_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
+
+ netdev_dbg(event_dev, "event: %lx\n", event);
+
+ if (!(event_dev->priv_flags & IFF_BONDING))
+ return NOTIFY_DONE;
+
+ if (event_dev->flags & IFF_MASTER) {
+ netdev_dbg(event_dev, "IFF_MASTER\n");
+ return bond_master_netdev_event(event, event_dev);
+ }
+
+ if (event_dev->flags & IFF_SLAVE) {
+ netdev_dbg(event_dev, "IFF_SLAVE\n");
+ return bond_slave_netdev_event(event, event_dev);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block bond_netdev_notifier = {
+ .notifier_call = bond_netdev_event,
+};
+
+/*---------------------------- Hashing Policies -----------------------------*/
+
+/* L2 hash helper */
+static inline u32 bond_eth_hash(struct sk_buff *skb)
+{
+ struct ethhdr *ep, hdr_tmp;
+
+ ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
+ if (ep)
+ return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
+ return 0;
+}
+
+/* Extract the appropriate headers based on bond's xmit policy */
+static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
+ struct flow_keys *fk)
+{
+ const struct ipv6hdr *iph6;
+ const struct iphdr *iph;
+ int noff, proto = -1;
+
+ if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
+ return skb_flow_dissect(skb, fk);
+
+ fk->ports = 0;
+ noff = skb_network_offset(skb);
+ if (skb->protocol == htons(ETH_P_IP)) {
+ if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
+ return false;
+ iph = ip_hdr(skb);
+ fk->src = iph->saddr;
+ fk->dst = iph->daddr;
+ noff += iph->ihl << 2;
+ if (!ip_is_fragment(iph))
+ proto = iph->protocol;
+ } else if (skb->protocol == htons(ETH_P_IPV6)) {
+ if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
+ return false;
+ iph6 = ipv6_hdr(skb);
+ fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
+ fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
+ noff += sizeof(*iph6);
+ proto = iph6->nexthdr;
+ } else {
+ return false;
+ }
+ if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
+ fk->ports = skb_flow_get_ports(skb, noff, proto);
+
+ return true;
+}
+
+/**
+ * bond_xmit_hash - generate a hash value based on the xmit policy
+ * @bond: bonding device
+ * @skb: buffer to use for headers
+ *
+ * This function will extract the necessary headers from the skb buffer and use
+ * them to generate a hash based on the xmit_policy set in the bonding device
+ */
+u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
+{
+ struct flow_keys flow;
+ u32 hash;
+
+ if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
+ !bond_flow_dissect(bond, skb, &flow))
+ return bond_eth_hash(skb);
+
+ if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
+ bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
+ hash = bond_eth_hash(skb);
+ else
+ hash = (__force u32)flow.ports;
+ hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
+ hash ^= (hash >> 16);
+ hash ^= (hash >> 8);
+
+ return hash;
+}
+
+/*-------------------------- Device entry points ----------------------------*/
+
+static void bond_work_init_all(struct bonding *bond)
+{
+ INIT_DELAYED_WORK(&bond->mcast_work,
+ bond_resend_igmp_join_requests_delayed);
+ INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
+ INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
+ if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
+ INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
+ else
+ INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
+ INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
+ INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
+}
+
+static void bond_work_cancel_all(struct bonding *bond)
+{
+ cancel_delayed_work_sync(&bond->mii_work);
+ cancel_delayed_work_sync(&bond->arp_work);
+ cancel_delayed_work_sync(&bond->alb_work);
+ cancel_delayed_work_sync(&bond->ad_work);
+ cancel_delayed_work_sync(&bond->mcast_work);
+ cancel_delayed_work_sync(&bond->slave_arr_work);
+}
+
+static int bond_open(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct list_head *iter;
+ struct slave *slave;
+
+ /* reset slave->backup and slave->inactive */
+ if (bond_has_slaves(bond)) {
+ bond_for_each_slave(bond, slave, iter) {
+ if (bond_uses_primary(bond) &&
+ slave != rcu_access_pointer(bond->curr_active_slave)) {
+ bond_set_slave_inactive_flags(slave,
+ BOND_SLAVE_NOTIFY_NOW);
+ } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
+ bond_set_slave_active_flags(slave,
+ BOND_SLAVE_NOTIFY_NOW);
+ }
+ }
+ }
+
+ bond_work_init_all(bond);
+
+ if (bond_is_lb(bond)) {
+ /* bond_alb_initialize must be called before the timer
+ * is started.
+ */
+ if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
+ return -ENOMEM;
+ if (bond->params.tlb_dynamic_lb)
+ queue_delayed_work(bond->wq, &bond->alb_work, 0);
+ }
+
+ if (bond->params.miimon) /* link check interval, in milliseconds. */
+ queue_delayed_work(bond->wq, &bond->mii_work, 0);
+
+ if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
+ queue_delayed_work(bond->wq, &bond->arp_work, 0);
+ bond->recv_probe = bond_arp_rcv;
+ }
+
+ if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+ queue_delayed_work(bond->wq, &bond->ad_work, 0);
+ /* register to receive LACPDUs */
+ bond->recv_probe = bond_3ad_lacpdu_recv;
+ bond_3ad_initiate_agg_selection(bond, 1);
+ }
+
+ if (bond_mode_uses_xmit_hash(bond))
+ bond_update_slave_arr(bond, NULL);
+
+ return 0;
+}
+
+static int bond_close(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+
+ bond_work_cancel_all(bond);
+ bond->send_peer_notif = 0;
+ if (bond_is_lb(bond))
+ bond_alb_deinitialize(bond);
+ bond->recv_probe = NULL;
+
+ return 0;
+}
+
+static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
+ struct rtnl_link_stats64 *stats)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct rtnl_link_stats64 temp;
+ struct list_head *iter;
+ struct slave *slave;
+
+ memcpy(stats, &bond->bond_stats, sizeof(*stats));
+
+ bond_for_each_slave(bond, slave, iter) {
+ const struct rtnl_link_stats64 *sstats =
+ dev_get_stats(slave->dev, &temp);
+ struct rtnl_link_stats64 *pstats = &slave->slave_stats;
+
+ stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
+ stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
+ stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
+ stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
+
+ stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
+ stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
+ stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
+ stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
+
+ stats->multicast += sstats->multicast - pstats->multicast;
+ stats->collisions += sstats->collisions - pstats->collisions;
+
+ stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
+ stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
+ stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
+ stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
+ stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
+ stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
+
+ stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
+ stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
+ stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
+ stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
+ stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
+
+ /* save off the slave stats for the next run */
+ memcpy(pstats, sstats, sizeof(*sstats));
+ }
+ memcpy(&bond->bond_stats, stats, sizeof(*stats));
+
+ return stats;
+}
+
+static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct net_device *slave_dev = NULL;
+ struct ifbond k_binfo;
+ struct ifbond __user *u_binfo = NULL;
+ struct ifslave k_sinfo;
+ struct ifslave __user *u_sinfo = NULL;
+ struct mii_ioctl_data *mii = NULL;
+ struct bond_opt_value newval;
+ struct net *net;
+ int res = 0;
+
+ netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
+
+ switch (cmd) {
+ case SIOCGMIIPHY:
+ mii = if_mii(ifr);
+ if (!mii)
+ return -EINVAL;
+
+ mii->phy_id = 0;
+ /* Fall Through */
+ case SIOCGMIIREG:
+ /* We do this again just in case we were called by SIOCGMIIREG
+ * instead of SIOCGMIIPHY.
+ */
+ mii = if_mii(ifr);
+ if (!mii)
+ return -EINVAL;
+
+ if (mii->reg_num == 1) {
+ mii->val_out = 0;
+ if (netif_carrier_ok(bond->dev))
+ mii->val_out = BMSR_LSTATUS;
+ }
+
+ return 0;
+ case BOND_INFO_QUERY_OLD:
+ case SIOCBONDINFOQUERY:
+ u_binfo = (struct ifbond __user *)ifr->ifr_data;
+
+ if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
+ return -EFAULT;
+
+ res = bond_info_query(bond_dev, &k_binfo);
+ if (res == 0 &&
+ copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
+ return -EFAULT;
+
+ return res;
+ case BOND_SLAVE_INFO_QUERY_OLD:
+ case SIOCBONDSLAVEINFOQUERY:
+ u_sinfo = (struct ifslave __user *)ifr->ifr_data;
+
+ if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
+ return -EFAULT;
+
+ res = bond_slave_info_query(bond_dev, &k_sinfo);
+ if (res == 0 &&
+ copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
+ return -EFAULT;
+
+ return res;
+ default:
+ break;
+ }
+
+ net = dev_net(bond_dev);
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
+
+ netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
+
+ if (!slave_dev)
+ return -ENODEV;
+
+ netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
+ switch (cmd) {
+ case BOND_ENSLAVE_OLD:
+ case SIOCBONDENSLAVE:
+ res = bond_enslave(bond_dev, slave_dev);
+ break;
+ case BOND_RELEASE_OLD:
+ case SIOCBONDRELEASE:
+ res = bond_release(bond_dev, slave_dev);
+ break;
+ case BOND_SETHWADDR_OLD:
+ case SIOCBONDSETHWADDR:
+ bond_set_dev_addr(bond_dev, slave_dev);
+ res = 0;
+ break;
+ case BOND_CHANGE_ACTIVE_OLD:
+ case SIOCBONDCHANGEACTIVE:
+ bond_opt_initstr(&newval, slave_dev->name);
+ res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
+ break;
+ default:
+ res = -EOPNOTSUPP;
+ }
+
+ return res;
+}
+
+static void bond_change_rx_flags(struct net_device *bond_dev, int change)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+
+ if (change & IFF_PROMISC)
+ bond_set_promiscuity(bond,
+ bond_dev->flags & IFF_PROMISC ? 1 : -1);
+
+ if (change & IFF_ALLMULTI)
+ bond_set_allmulti(bond,
+ bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
+}
+
+static void bond_set_rx_mode(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct list_head *iter;
+ struct slave *slave;
+
+ rcu_read_lock();
+ if (bond_uses_primary(bond)) {
+ slave = rcu_dereference(bond->curr_active_slave);
+ if (slave) {
+ dev_uc_sync(slave->dev, bond_dev);
+ dev_mc_sync(slave->dev, bond_dev);
+ }
+ } else {
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ dev_uc_sync_multiple(slave->dev, bond_dev);
+ dev_mc_sync_multiple(slave->dev, bond_dev);
+ }
+ }
+ rcu_read_unlock();
+}
+
+static int bond_neigh_init(struct neighbour *n)
+{
+ struct bonding *bond = netdev_priv(n->dev);
+ const struct net_device_ops *slave_ops;
+ struct neigh_parms parms;
+ struct slave *slave;
+ int ret;
+
+ slave = bond_first_slave(bond);
+ if (!slave)
+ return 0;
+ slave_ops = slave->dev->netdev_ops;
+ if (!slave_ops->ndo_neigh_setup)
+ return 0;
+
+ parms.neigh_setup = NULL;
+ parms.neigh_cleanup = NULL;
+ ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
+ if (ret)
+ return ret;
+
+ /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
+ * after the last slave has been detached. Assumes that all slaves
+ * utilize the same neigh_cleanup (true at this writing as only user
+ * is ipoib).
+ */
+ n->parms->neigh_cleanup = parms.neigh_cleanup;
+
+ if (!parms.neigh_setup)
+ return 0;
+
+ return parms.neigh_setup(n);
+}
+
+/* The bonding ndo_neigh_setup is called at init time beofre any
+ * slave exists. So we must declare proxy setup function which will
+ * be used at run time to resolve the actual slave neigh param setup.
+ *
+ * It's also called by master devices (such as vlans) to setup their
+ * underlying devices. In that case - do nothing, we're already set up from
+ * our init.
+ */
+static int bond_neigh_setup(struct net_device *dev,
+ struct neigh_parms *parms)
+{
+ /* modify only our neigh_parms */
+ if (parms->dev == dev)
+ parms->neigh_setup = bond_neigh_init;
+
+ return 0;
+}
+
+/* Change the MTU of all of a master's slaves to match the master */
+static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave, *rollback_slave;
+ struct list_head *iter;
+ int res = 0;
+
+ netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
+
+ bond_for_each_slave(bond, slave, iter) {
+ netdev_dbg(bond_dev, "s %p c_m %p\n",
+ slave, slave->dev->netdev_ops->ndo_change_mtu);
+
+ res = dev_set_mtu(slave->dev, new_mtu);
+
+ if (res) {
+ /* If we failed to set the slave's mtu to the new value
+ * we must abort the operation even in ACTIVE_BACKUP
+ * mode, because if we allow the backup slaves to have
+ * different mtu values than the active slave we'll
+ * need to change their mtu when doing a failover. That
+ * means changing their mtu from timer context, which
+ * is probably not a good idea.
+ */
+ netdev_dbg(bond_dev, "err %d %s\n", res,
+ slave->dev->name);
+ goto unwind;
+ }
+ }
+
+ bond_dev->mtu = new_mtu;
+
+ return 0;
+
+unwind:
+ /* unwind from head to the slave that failed */
+ bond_for_each_slave(bond, rollback_slave, iter) {
+ int tmp_res;
+
+ if (rollback_slave == slave)
+ break;
+
+ tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
+ if (tmp_res) {
+ netdev_dbg(bond_dev, "unwind err %d dev %s\n",
+ tmp_res, rollback_slave->dev->name);
+ }
+ }
+
+ return res;
+}
+
+/* Change HW address
+ *
+ * Note that many devices must be down to change the HW address, and
+ * downing the master releases all slaves. We can make bonds full of
+ * bonding devices to test this, however.
+ */
+static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave, *rollback_slave;
+ struct sockaddr *sa = addr, tmp_sa;
+ struct list_head *iter;
+ int res = 0;
+
+ if (BOND_MODE(bond) == BOND_MODE_ALB)
+ return bond_alb_set_mac_address(bond_dev, addr);
+
+
+ netdev_dbg(bond_dev, "bond=%p\n", bond);
+
+ /* If fail_over_mac is enabled, do nothing and return success.
+ * Returning an error causes ifenslave to fail.
+ */
+ if (bond->params.fail_over_mac &&
+ BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
+ return 0;
+
+ if (!is_valid_ether_addr(sa->sa_data))
+ return -EADDRNOTAVAIL;
+
+ bond_for_each_slave(bond, slave, iter) {
+ netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
+ res = dev_set_mac_address(slave->dev, addr);
+ if (res) {
+ /* TODO: consider downing the slave
+ * and retry ?
+ * User should expect communications
+ * breakage anyway until ARP finish
+ * updating, so...
+ */
+ netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
+ goto unwind;
+ }
+ }
+
+ /* success */
+ memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
+ return 0;
+
+unwind:
+ memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
+ tmp_sa.sa_family = bond_dev->type;
+
+ /* unwind from head to the slave that failed */
+ bond_for_each_slave(bond, rollback_slave, iter) {
+ int tmp_res;
+
+ if (rollback_slave == slave)
+ break;
+
+ tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
+ if (tmp_res) {
+ netdev_dbg(bond_dev, "unwind err %d dev %s\n",
+ tmp_res, rollback_slave->dev->name);
+ }
+ }
+
+ return res;
+}
+
+/**
+ * bond_xmit_slave_id - transmit skb through slave with slave_id
+ * @bond: bonding device that is transmitting
+ * @skb: buffer to transmit
+ * @slave_id: slave id up to slave_cnt-1 through which to transmit
+ *
+ * This function tries to transmit through slave with slave_id but in case
+ * it fails, it tries to find the first available slave for transmission.
+ * The skb is consumed in all cases, thus the function is void.
+ */
+static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
+{
+ struct list_head *iter;
+ struct slave *slave;
+ int i = slave_id;
+
+ /* Here we start from the slave with slave_id */
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ if (--i < 0) {
+ if (bond_slave_can_tx(slave)) {
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ return;
+ }
+ }
+ }
+
+ /* Here we start from the first slave up to slave_id */
+ i = slave_id;
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ if (--i < 0)
+ break;
+ if (bond_slave_can_tx(slave)) {
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ return;
+ }
+ }
+ /* no slave that can tx has been found */
+ bond_tx_drop(bond->dev, skb);
+}
+
+/**
+ * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
+ * @bond: bonding device to use
+ *
+ * Based on the value of the bonding device's packets_per_slave parameter
+ * this function generates a slave id, which is usually used as the next
+ * slave to transmit through.
+ */
+static u32 bond_rr_gen_slave_id(struct bonding *bond)
+{
+ u32 slave_id;
+ struct reciprocal_value reciprocal_packets_per_slave;
+ int packets_per_slave = bond->params.packets_per_slave;
+
+ switch (packets_per_slave) {
+ case 0:
+ slave_id = prandom_u32();
+ break;
+ case 1:
+ slave_id = bond->rr_tx_counter;
+ break;
+ default:
+ reciprocal_packets_per_slave =
+ bond->params.reciprocal_packets_per_slave;
+ slave_id = reciprocal_divide(bond->rr_tx_counter,
+ reciprocal_packets_per_slave);
+ break;
+ }
+ bond->rr_tx_counter++;
+
+ return slave_id;
+}
+
+static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct iphdr *iph = ip_hdr(skb);
+ struct slave *slave;
+ u32 slave_id;
+
+ /* Start with the curr_active_slave that joined the bond as the
+ * default for sending IGMP traffic. For failover purposes one
+ * needs to maintain some consistency for the interface that will
+ * send the join/membership reports. The curr_active_slave found
+ * will send all of this type of traffic.
+ */
+ if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
+ slave = rcu_dereference(bond->curr_active_slave);
+ if (slave)
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ else
+ bond_xmit_slave_id(bond, skb, 0);
+ } else {
+ int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
+
+ if (likely(slave_cnt)) {
+ slave_id = bond_rr_gen_slave_id(bond);
+ bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
+ } else {
+ bond_tx_drop(bond_dev, skb);
+ }
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/* In active-backup mode, we know that bond->curr_active_slave is always valid if
+ * the bond has a usable interface.
+ */
+static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave;
+
+ slave = rcu_dereference(bond->curr_active_slave);
+ if (slave)
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ else
+ bond_tx_drop(bond_dev, skb);
+
+ return NETDEV_TX_OK;
+}
+
+/* Use this to update slave_array when (a) it's not appropriate to update
+ * slave_array right away (note that update_slave_array() may sleep)
+ * and / or (b) RTNL is not held.
+ */
+void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
+{
+ queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
+}
+
+/* Slave array work handler. Holds only RTNL */
+static void bond_slave_arr_handler(struct work_struct *work)
+{
+ struct bonding *bond = container_of(work, struct bonding,
+ slave_arr_work.work);
+ int ret;
+
+ if (!rtnl_trylock())
+ goto err;
+
+ ret = bond_update_slave_arr(bond, NULL);
+ rtnl_unlock();
+ if (ret) {
+ pr_warn_ratelimited("Failed to update slave array from WT\n");
+ goto err;
+ }
+ return;
+
+err:
+ bond_slave_arr_work_rearm(bond, 1);
+}
+
+/* Build the usable slaves array in control path for modes that use xmit-hash
+ * to determine the slave interface -
+ * (a) BOND_MODE_8023AD
+ * (b) BOND_MODE_XOR
+ * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
+ *
+ * The caller is expected to hold RTNL only and NO other lock!
+ */
+int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
+{
+ struct slave *slave;
+ struct list_head *iter;
+ struct bond_up_slave *new_arr, *old_arr;
+ int slaves_in_agg;
+ int agg_id = 0;
+ int ret = 0;
+
+#ifdef CONFIG_LOCKDEP
+ WARN_ON(lockdep_is_held(&bond->mode_lock));
+#endif
+
+ new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
+ GFP_KERNEL);
+ if (!new_arr) {
+ ret = -ENOMEM;
+ pr_err("Failed to build slave-array.\n");
+ goto out;
+ }
+ if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+ struct ad_info ad_info;
+
+ if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
+ pr_debug("bond_3ad_get_active_agg_info failed\n");
+ kfree_rcu(new_arr, rcu);
+ /* No active aggragator means it's not safe to use
+ * the previous array.
+ */
+ old_arr = rtnl_dereference(bond->slave_arr);
+ if (old_arr) {
+ RCU_INIT_POINTER(bond->slave_arr, NULL);
+ kfree_rcu(old_arr, rcu);
+ }
+ goto out;
+ }
+ slaves_in_agg = ad_info.ports;
+ agg_id = ad_info.aggregator_id;
+ }
+ bond_for_each_slave(bond, slave, iter) {
+ if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+ struct aggregator *agg;
+
+ agg = SLAVE_AD_INFO(slave)->port.aggregator;
+ if (!agg || agg->aggregator_identifier != agg_id)
+ continue;
+ }
+ if (!bond_slave_can_tx(slave))
+ continue;
+ if (skipslave == slave)
+ continue;
+ new_arr->arr[new_arr->count++] = slave;
+ }
+
+ old_arr = rtnl_dereference(bond->slave_arr);
+ rcu_assign_pointer(bond->slave_arr, new_arr);
+ if (old_arr)
+ kfree_rcu(old_arr, rcu);
+out:
+ if (ret != 0 && skipslave) {
+ int idx;
+
+ /* Rare situation where caller has asked to skip a specific
+ * slave but allocation failed (most likely!). BTW this is
+ * only possible when the call is initiated from
+ * __bond_release_one(). In this situation; overwrite the
+ * skipslave entry in the array with the last entry from the
+ * array to avoid a situation where the xmit path may choose
+ * this to-be-skipped slave to send a packet out.
+ */
+ old_arr = rtnl_dereference(bond->slave_arr);
+ for (idx = 0; idx < old_arr->count; idx++) {
+ if (skipslave == old_arr->arr[idx]) {
+ old_arr->arr[idx] =
+ old_arr->arr[old_arr->count-1];
+ old_arr->count--;
+ break;
+ }
+ }
+ }
+ return ret;
+}
+
+/* Use this Xmit function for 3AD as well as XOR modes. The current
+ * usable slave array is formed in the control path. The xmit function
+ * just calculates hash and sends the packet out.
+ */
+static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct bonding *bond = netdev_priv(dev);
+ struct slave *slave;
+ struct bond_up_slave *slaves;
+ unsigned int count;
+
+ slaves = rcu_dereference(bond->slave_arr);
+ count = slaves ? ACCESS_ONCE(slaves->count) : 0;
+ if (likely(count)) {
+ slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ } else {
+ bond_tx_drop(dev, skb);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/* in broadcast mode, we send everything to all usable interfaces. */
+static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave = NULL;
+ struct list_head *iter;
+
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ if (bond_is_last_slave(bond, slave))
+ break;
+ if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb2) {
+ net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
+ bond_dev->name, __func__);
+ continue;
+ }
+ bond_dev_queue_xmit(bond, skb2, slave->dev);
+ }
+ }
+ if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ else
+ bond_tx_drop(bond_dev, skb);
+
+ return NETDEV_TX_OK;
+}
+
+/*------------------------- Device initialization ---------------------------*/
+
+/* Lookup the slave that corresponds to a qid */
+static inline int bond_slave_override(struct bonding *bond,
+ struct sk_buff *skb)
+{
+ struct slave *slave = NULL;
+ struct list_head *iter;
+
+ if (!skb->queue_mapping)
+ return 1;
+
+ /* Find out if any slaves have the same mapping as this skb. */
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ if (slave->queue_id == skb->queue_mapping) {
+ if (bond_slave_is_up(slave) &&
+ slave->link == BOND_LINK_UP) {
+ bond_dev_queue_xmit(bond, skb, slave->dev);
+ return 0;
+ }
+ /* If the slave isn't UP, use default transmit policy. */
+ break;
+ }
+ }
+
+ return 1;
+}
+
+
+static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback)
+{
+ /* This helper function exists to help dev_pick_tx get the correct
+ * destination queue. Using a helper function skips a call to
+ * skb_tx_hash and will put the skbs in the queue we expect on their
+ * way down to the bonding driver.
+ */
+ u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
+
+ /* Save the original txq to restore before passing to the driver */
+ qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
+
+ if (unlikely(txq >= dev->real_num_tx_queues)) {
+ do {
+ txq -= dev->real_num_tx_queues;
+ } while (txq >= dev->real_num_tx_queues);
+ }
+ return txq;
+}
+
+static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct bonding *bond = netdev_priv(dev);
+
+ if (bond_should_override_tx_queue(bond) &&
+ !bond_slave_override(bond, skb))
+ return NETDEV_TX_OK;
+
+ switch (BOND_MODE(bond)) {
+ case BOND_MODE_ROUNDROBIN:
+ return bond_xmit_roundrobin(skb, dev);
+ case BOND_MODE_ACTIVEBACKUP:
+ return bond_xmit_activebackup(skb, dev);
+ case BOND_MODE_8023AD:
+ case BOND_MODE_XOR:
+ return bond_3ad_xor_xmit(skb, dev);
+ case BOND_MODE_BROADCAST:
+ return bond_xmit_broadcast(skb, dev);
+ case BOND_MODE_ALB:
+ return bond_alb_xmit(skb, dev);
+ case BOND_MODE_TLB:
+ return bond_tlb_xmit(skb, dev);
+ default:
+ /* Should never happen, mode already checked */
+ netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
+ WARN_ON_ONCE(1);
+ bond_tx_drop(dev, skb);
+ return NETDEV_TX_OK;
+ }
+}
+
+static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct bonding *bond = netdev_priv(dev);
+ netdev_tx_t ret = NETDEV_TX_OK;
+
+ /* If we risk deadlock from transmitting this in the
+ * netpoll path, tell netpoll to queue the frame for later tx
+ */
+ if (unlikely(is_netpoll_tx_blocked(dev)))
+ return NETDEV_TX_BUSY;
+
+ rcu_read_lock();
+ if (bond_has_slaves(bond))
+ ret = __bond_start_xmit(skb, dev);
+ else
+ bond_tx_drop(dev, skb);
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static int bond_ethtool_get_settings(struct net_device *bond_dev,
+ struct ethtool_cmd *ecmd)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ unsigned long speed = 0;
+ struct list_head *iter;
+ struct slave *slave;
+
+ ecmd->duplex = DUPLEX_UNKNOWN;
+ ecmd->port = PORT_OTHER;
+
+ /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
+ * do not need to check mode. Though link speed might not represent
+ * the true receive or transmit bandwidth (not all modes are symmetric)
+ * this is an accurate maximum.
+ */
+ bond_for_each_slave(bond, slave, iter) {
+ if (bond_slave_can_tx(slave)) {
+ if (slave->speed != SPEED_UNKNOWN)
+ speed += slave->speed;
+ if (ecmd->duplex == DUPLEX_UNKNOWN &&
+ slave->duplex != DUPLEX_UNKNOWN)
+ ecmd->duplex = slave->duplex;
+ }
+ }
+ ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
+
+ return 0;
+}
+
+static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
+ struct ethtool_drvinfo *drvinfo)
+{
+ strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
+ strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
+ snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
+ BOND_ABI_VERSION);
+}
+
+static const struct ethtool_ops bond_ethtool_ops = {
+ .get_drvinfo = bond_ethtool_get_drvinfo,
+ .get_settings = bond_ethtool_get_settings,
+ .get_link = ethtool_op_get_link,
+};
+
+static const struct net_device_ops bond_netdev_ops = {
+ .ndo_init = bond_init,
+ .ndo_uninit = bond_uninit,
+ .ndo_open = bond_open,
+ .ndo_stop = bond_close,
+ .ndo_start_xmit = bond_start_xmit,
+ .ndo_select_queue = bond_select_queue,
+ .ndo_get_stats64 = bond_get_stats,
+ .ndo_do_ioctl = bond_do_ioctl,
+ .ndo_change_rx_flags = bond_change_rx_flags,
+ .ndo_set_rx_mode = bond_set_rx_mode,
+ .ndo_change_mtu = bond_change_mtu,
+ .ndo_set_mac_address = bond_set_mac_address,
+ .ndo_neigh_setup = bond_neigh_setup,
+ .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_netpoll_setup = bond_netpoll_setup,
+ .ndo_netpoll_cleanup = bond_netpoll_cleanup,
+ .ndo_poll_controller = bond_poll_controller,
+#endif
+ .ndo_add_slave = bond_enslave,
+ .ndo_del_slave = bond_release,
+ .ndo_fix_features = bond_fix_features,
+ .ndo_bridge_setlink = ndo_dflt_netdev_switch_port_bridge_setlink,
+ .ndo_bridge_dellink = ndo_dflt_netdev_switch_port_bridge_dellink,
+ .ndo_features_check = passthru_features_check,
+};
+
+static const struct device_type bond_type = {
+ .name = "bond",
+};
+
+static void bond_destructor(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ if (bond->wq)
+ destroy_workqueue(bond->wq);
+ free_netdev(bond_dev);
+}
+
+void bond_setup(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+
+ spin_lock_init(&bond->mode_lock);
+ bond->params = bonding_defaults;
+
+ /* Initialize pointers */
+ bond->dev = bond_dev;
+
+ /* Initialize the device entry points */
+ ether_setup(bond_dev);
+ bond_dev->netdev_ops = &bond_netdev_ops;
+ bond_dev->ethtool_ops = &bond_ethtool_ops;
+
+ bond_dev->destructor = bond_destructor;
+
+ SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
+
+ /* Initialize the device options */
+ bond_dev->tx_queue_len = 0;
+ bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
+ bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
+ bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
+
+ /* don't acquire bond device's netif_tx_lock when transmitting */
+ bond_dev->features |= NETIF_F_LLTX;
+
+ /* By default, we declare the bond to be fully
+ * VLAN hardware accelerated capable. Special
+ * care is taken in the various xmit functions
+ * when there are slaves that are not hw accel
+ * capable
+ */
+
+ /* Don't allow bond devices to change network namespaces. */
+ bond_dev->features |= NETIF_F_NETNS_LOCAL;
+
+ bond_dev->hw_features = BOND_VLAN_FEATURES |
+ NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_CTAG_RX |
+ NETIF_F_HW_VLAN_CTAG_FILTER;
+
+ bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
+ bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
+ bond_dev->features |= bond_dev->hw_features;
+}
+
+/* Destroy a bonding device.
+ * Must be under rtnl_lock when this function is called.
+ */
+static void bond_uninit(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct list_head *iter;
+ struct slave *slave;
+ struct bond_up_slave *arr;
+
+ bond_netpoll_cleanup(bond_dev);
+
+ /* Release the bonded slaves */
+ bond_for_each_slave(bond, slave, iter)
+ __bond_release_one(bond_dev, slave->dev, true);
+ netdev_info(bond_dev, "Released all slaves\n");
+
+ arr = rtnl_dereference(bond->slave_arr);
+ if (arr) {
+ RCU_INIT_POINTER(bond->slave_arr, NULL);
+ kfree_rcu(arr, rcu);
+ }
+
+ list_del(&bond->bond_list);
+
+ bond_debug_unregister(bond);
+}
+
+/*------------------------- Module initialization ---------------------------*/
+
+static int bond_check_params(struct bond_params *params)
+{
+ int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
+ struct bond_opt_value newval;
+ const struct bond_opt_value *valptr;
+ int arp_all_targets_value;
+
+ /* Convert string parameters. */
+ if (mode) {
+ bond_opt_initstr(&newval, mode);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
+ if (!valptr) {
+ pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
+ return -EINVAL;
+ }
+ bond_mode = valptr->value;
+ }
+
+ if (xmit_hash_policy) {
+ if ((bond_mode != BOND_MODE_XOR) &&
+ (bond_mode != BOND_MODE_8023AD) &&
+ (bond_mode != BOND_MODE_TLB)) {
+ pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
+ bond_mode_name(bond_mode));
+ } else {
+ bond_opt_initstr(&newval, xmit_hash_policy);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
+ xmit_hash_policy);
+ return -EINVAL;
+ }
+ xmit_hashtype = valptr->value;
+ }
+ }
+
+ if (lacp_rate) {
+ if (bond_mode != BOND_MODE_8023AD) {
+ pr_info("lacp_rate param is irrelevant in mode %s\n",
+ bond_mode_name(bond_mode));
+ } else {
+ bond_opt_initstr(&newval, lacp_rate);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: Invalid lacp rate \"%s\"\n",
+ lacp_rate);
+ return -EINVAL;
+ }
+ lacp_fast = valptr->value;
+ }
+ }
+
+ if (ad_select) {
+ bond_opt_initstr(&newval, ad_select);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
+ return -EINVAL;
+ }
+ params->ad_select = valptr->value;
+ if (bond_mode != BOND_MODE_8023AD)
+ pr_warn("ad_select param only affects 802.3ad mode\n");
+ } else {
+ params->ad_select = BOND_AD_STABLE;
+ }
+
+ if (max_bonds < 0) {
+ pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
+ max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
+ max_bonds = BOND_DEFAULT_MAX_BONDS;
+ }
+
+ if (miimon < 0) {
+ pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
+ miimon, INT_MAX);
+ miimon = 0;
+ }
+
+ if (updelay < 0) {
+ pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
+ updelay, INT_MAX);
+ updelay = 0;
+ }
+
+ if (downdelay < 0) {
+ pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
+ downdelay, INT_MAX);
+ downdelay = 0;
+ }
+
+ if ((use_carrier != 0) && (use_carrier != 1)) {
+ pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
+ use_carrier);
+ use_carrier = 1;
+ }
+
+ if (num_peer_notif < 0 || num_peer_notif > 255) {
+ pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
+ num_peer_notif);
+ num_peer_notif = 1;
+ }
+
+ /* reset values for 802.3ad/TLB/ALB */
+ if (!bond_mode_uses_arp(bond_mode)) {
+ if (!miimon) {
+ pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
+ pr_warn("Forcing miimon to 100msec\n");
+ miimon = BOND_DEFAULT_MIIMON;
+ }
+ }
+
+ if (tx_queues < 1 || tx_queues > 255) {
+ pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
+ tx_queues, BOND_DEFAULT_TX_QUEUES);
+ tx_queues = BOND_DEFAULT_TX_QUEUES;
+ }
+
+ if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
+ pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
+ all_slaves_active);
+ all_slaves_active = 0;
+ }
+
+ if (resend_igmp < 0 || resend_igmp > 255) {
+ pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
+ resend_igmp, BOND_DEFAULT_RESEND_IGMP);
+ resend_igmp = BOND_DEFAULT_RESEND_IGMP;
+ }
+
+ bond_opt_initval(&newval, packets_per_slave);
+ if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
+ pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
+ packets_per_slave, USHRT_MAX);
+ packets_per_slave = 1;
+ }
+
+ if (bond_mode == BOND_MODE_ALB) {
+ pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
+ updelay);
+ }
+
+ if (!miimon) {
+ if (updelay || downdelay) {
+ /* just warn the user the up/down delay will have
+ * no effect since miimon is zero...
+ */
+ pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
+ updelay, downdelay);
+ }
+ } else {
+ /* don't allow arp monitoring */
+ if (arp_interval) {
+ pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
+ miimon, arp_interval);
+ arp_interval = 0;
+ }
+
+ if ((updelay % miimon) != 0) {
+ pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
+ updelay, miimon, (updelay / miimon) * miimon);
+ }
+
+ updelay /= miimon;
+
+ if ((downdelay % miimon) != 0) {
+ pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
+ downdelay, miimon,
+ (downdelay / miimon) * miimon);
+ }
+
+ downdelay /= miimon;
+ }
+
+ if (arp_interval < 0) {
+ pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
+ arp_interval, INT_MAX);
+ arp_interval = 0;
+ }
+
+ for (arp_ip_count = 0, i = 0;
+ (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
+ __be32 ip;
+
+ /* not a complete check, but good enough to catch mistakes */
+ if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
+ !bond_is_ip_target_ok(ip)) {
+ pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
+ arp_ip_target[i]);
+ arp_interval = 0;
+ } else {
+ if (bond_get_targets_ip(arp_target, ip) == -1)
+ arp_target[arp_ip_count++] = ip;
+ else
+ pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
+ &ip);
+ }
+ }
+
+ if (arp_interval && !arp_ip_count) {
+ /* don't allow arping if no arp_ip_target given... */
+ pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
+ arp_interval);
+ arp_interval = 0;
+ }
+
+ if (arp_validate) {
+ if (!arp_interval) {
+ pr_err("arp_validate requires arp_interval\n");
+ return -EINVAL;
+ }
+
+ bond_opt_initstr(&newval, arp_validate);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: invalid arp_validate \"%s\"\n",
+ arp_validate);
+ return -EINVAL;
+ }
+ arp_validate_value = valptr->value;
+ } else {
+ arp_validate_value = 0;
+ }
+
+ arp_all_targets_value = 0;
+ if (arp_all_targets) {
+ bond_opt_initstr(&newval, arp_all_targets);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
+ arp_all_targets);
+ arp_all_targets_value = 0;
+ } else {
+ arp_all_targets_value = valptr->value;
+ }
+ }
+
+ if (miimon) {
+ pr_info("MII link monitoring set to %d ms\n", miimon);
+ } else if (arp_interval) {
+ valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
+ arp_validate_value);
+ pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
+ arp_interval, valptr->string, arp_ip_count);
+
+ for (i = 0; i < arp_ip_count; i++)
+ pr_cont(" %s", arp_ip_target[i]);
+
+ pr_cont("\n");
+
+ } else if (max_bonds) {
+ /* miimon and arp_interval not set, we need one so things
+ * work as expected, see bonding.txt for details
+ */
+ pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
+ }
+
+ if (primary && !bond_mode_uses_primary(bond_mode)) {
+ /* currently, using a primary only makes sense
+ * in active backup, TLB or ALB modes
+ */
+ pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
+ primary, bond_mode_name(bond_mode));
+ primary = NULL;
+ }
+
+ if (primary && primary_reselect) {
+ bond_opt_initstr(&newval, primary_reselect);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: Invalid primary_reselect \"%s\"\n",
+ primary_reselect);
+ return -EINVAL;
+ }
+ primary_reselect_value = valptr->value;
+ } else {
+ primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
+ }
+
+ if (fail_over_mac) {
+ bond_opt_initstr(&newval, fail_over_mac);
+ valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
+ &newval);
+ if (!valptr) {
+ pr_err("Error: invalid fail_over_mac \"%s\"\n",
+ fail_over_mac);
+ return -EINVAL;
+ }
+ fail_over_mac_value = valptr->value;
+ if (bond_mode != BOND_MODE_ACTIVEBACKUP)
+ pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
+ } else {
+ fail_over_mac_value = BOND_FOM_NONE;
+ }
+
+ if (lp_interval == 0) {
+ pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
+ INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
+ lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
+ }
+
+ /* fill params struct with the proper values */
+ params->mode = bond_mode;
+ params->xmit_policy = xmit_hashtype;
+ params->miimon = miimon;
+ params->num_peer_notif = num_peer_notif;
+ params->arp_interval = arp_interval;
+ params->arp_validate = arp_validate_value;
+ params->arp_all_targets = arp_all_targets_value;
+ params->updelay = updelay;
+ params->downdelay = downdelay;
+ params->use_carrier = use_carrier;
+ params->lacp_fast = lacp_fast;
+ params->primary[0] = 0;
+ params->primary_reselect = primary_reselect_value;
+ params->fail_over_mac = fail_over_mac_value;
+ params->tx_queues = tx_queues;
+ params->all_slaves_active = all_slaves_active;
+ params->resend_igmp = resend_igmp;
+ params->min_links = min_links;
+ params->lp_interval = lp_interval;
+ params->packets_per_slave = packets_per_slave;
+ params->tlb_dynamic_lb = 1; /* Default value */
+ if (packets_per_slave > 0) {
+ params->reciprocal_packets_per_slave =
+ reciprocal_value(packets_per_slave);
+ } else {
+ /* reciprocal_packets_per_slave is unused if
+ * packets_per_slave is 0 or 1, just initialize it
+ */
+ params->reciprocal_packets_per_slave =
+ (struct reciprocal_value) { 0 };
+ }
+
+ if (primary) {
+ strncpy(params->primary, primary, IFNAMSIZ);
+ params->primary[IFNAMSIZ - 1] = 0;
+ }
+
+ memcpy(params->arp_targets, arp_target, sizeof(arp_target));
+
+ return 0;
+}
+
+static struct lock_class_key bonding_netdev_xmit_lock_key;
+static struct lock_class_key bonding_netdev_addr_lock_key;
+static struct lock_class_key bonding_tx_busylock_key;
+
+static void bond_set_lockdep_class_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock,
+ &bonding_netdev_xmit_lock_key);
+}
+
+static void bond_set_lockdep_class(struct net_device *dev)
+{
+ lockdep_set_class(&dev->addr_list_lock,
+ &bonding_netdev_addr_lock_key);
+ netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
+ dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
+}
+
+/* Called from registration process */
+static int bond_init(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
+
+ netdev_dbg(bond_dev, "Begin bond_init\n");
+
+ bond->wq = create_singlethread_workqueue(bond_dev->name);
+ if (!bond->wq)
+ return -ENOMEM;
+
+ bond_set_lockdep_class(bond_dev);
+
+ list_add_tail(&bond->bond_list, &bn->dev_list);
+
+ bond_prepare_sysfs_group(bond);
+
+ bond_debug_register(bond);
+
+ /* Ensure valid dev_addr */
+ if (is_zero_ether_addr(bond_dev->dev_addr) &&
+ bond_dev->addr_assign_type == NET_ADDR_PERM)
+ eth_hw_addr_random(bond_dev);
+
+ return 0;
+}
+
+unsigned int bond_get_num_tx_queues(void)
+{
+ return tx_queues;
+}
+
+/* Create a new bond based on the specified name and bonding parameters.
+ * If name is NULL, obtain a suitable "bond%d" name for us.
+ * Caller must NOT hold rtnl_lock; we need to release it here before we
+ * set up our sysfs entries.
+ */
+int bond_create(struct net *net, const char *name)
+{
+ struct net_device *bond_dev;
+ struct bonding *bond;
+ struct alb_bond_info *bond_info;
+ int res;
+
+ rtnl_lock();
+
+ bond_dev = alloc_netdev_mq(sizeof(struct bonding),
+ name ? name : "bond%d", NET_NAME_UNKNOWN,
+ bond_setup, tx_queues);
+ if (!bond_dev) {
+ pr_err("%s: eek! can't alloc netdev!\n", name);
+ rtnl_unlock();
+ return -ENOMEM;
+ }
+
+ /*
+ * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
+ * It is set to 0 by default which is wrong.
+ */
+ bond = netdev_priv(bond_dev);
+ bond_info = &(BOND_ALB_INFO(bond));
+ bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
+
+ dev_net_set(bond_dev, net);
+ bond_dev->rtnl_link_ops = &bond_link_ops;
+
+ res = register_netdevice(bond_dev);
+
+ netif_carrier_off(bond_dev);
+
+ rtnl_unlock();
+ if (res < 0)
+ bond_destructor(bond_dev);
+ return res;
+}
+
+static int __net_init bond_net_init(struct net *net)
+{
+ struct bond_net *bn = net_generic(net, bond_net_id);
+
+ bn->net = net;
+ INIT_LIST_HEAD(&bn->dev_list);
+
+ bond_create_proc_dir(bn);
+ bond_create_sysfs(bn);
+
+ return 0;
+}
+
+static void __net_exit bond_net_exit(struct net *net)
+{
+ struct bond_net *bn = net_generic(net, bond_net_id);
+ struct bonding *bond, *tmp_bond;
+ LIST_HEAD(list);
+
+ bond_destroy_sysfs(bn);
+
+ /* Kill off any bonds created after unregistering bond rtnl ops */
+ rtnl_lock();
+ list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
+ unregister_netdevice_queue(bond->dev, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+
+ bond_destroy_proc_dir(bn);
+}
+
+static struct pernet_operations bond_net_ops = {
+ .init = bond_net_init,
+ .exit = bond_net_exit,
+ .id = &bond_net_id,
+ .size = sizeof(struct bond_net),
+};
+
+static int __init bonding_init(void)
+{
+ int i;
+ int res;
+
+ pr_info("%s", bond_version);
+
+ res = bond_check_params(&bonding_defaults);
+ if (res)
+ goto out;
+
+ res = register_pernet_subsys(&bond_net_ops);
+ if (res)
+ goto out;
+
+ res = bond_netlink_init();
+ if (res)
+ goto err_link;
+
+ bond_create_debugfs();
+
+ for (i = 0; i < max_bonds; i++) {
+ res = bond_create(&init_net, NULL);
+ if (res)
+ goto err;
+ }
+
+ register_netdevice_notifier(&bond_netdev_notifier);
+out:
+ return res;
+err:
+ bond_destroy_debugfs();
+ bond_netlink_fini();
+err_link:
+ unregister_pernet_subsys(&bond_net_ops);
+ goto out;
+
+}
+
+static void __exit bonding_exit(void)
+{
+ unregister_netdevice_notifier(&bond_netdev_notifier);
+
+ bond_destroy_debugfs();
+
+ bond_netlink_fini();
+ unregister_pernet_subsys(&bond_net_ops);
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ /* Make sure we don't have an imbalance on our netpoll blocking */
+ WARN_ON(atomic_read(&netpoll_block_tx));
+#endif
+}
+
+module_init(bonding_init);
+module_exit(bonding_exit);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
+MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Code Review / kvmfornfv.git / blobdiff