diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/bonding/bond_main.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/bonding/bond_main.c | 4969 |
1 files changed, 4969 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/drivers/net/bonding/bond_main.c b/ANDROID_3.4.5/drivers/net/bonding/bond_main.c new file mode 100644 index 00000000..a579a2f5 --- /dev/null +++ b/ANDROID_3.4.5/drivers/net/bonding/bond_main.c @@ -0,0 +1,4969 @@ +/* + * originally based on the dummy device. + * + * Copyright 1999, Thomas Davis, tadavis@lbl.gov. + * Licensed under the GPL. Based on dummy.c, and eql.c devices. + * + * bonding.c: an Ethernet Bonding driver + * + * This is useful to talk to a Cisco EtherChannel compatible equipment: + * Cisco 5500 + * Sun Trunking (Solaris) + * Alteon AceDirector Trunks + * Linux Bonding + * and probably many L2 switches ... + * + * How it works: + * ifconfig bond0 ipaddress netmask up + * will setup a network device, with an ip address. No mac address + * will be assigned at this time. The hw mac address will come from + * the first slave bonded to the channel. All slaves will then use + * this hw mac address. + * + * ifconfig bond0 down + * will release all slaves, marking them as down. + * + * ifenslave bond0 eth0 + * will attach eth0 to bond0 as a slave. eth0 hw mac address will either + * a: be used as initial mac address + * b: if a hw mac address already is there, eth0's hw mac address + * will then be set from bond0. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <net/ip.h> +#include <linux/ip.h> +#include <linux/tcp.h> +#include <linux/udp.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/timer.h> +#include <linux/socket.h> +#include <linux/ctype.h> +#include <linux/inet.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <asm/dma.h> +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/igmp.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/rtnetlink.h> +#include <linux/smp.h> +#include <linux/if_ether.h> +#include <net/arp.h> +#include <linux/mii.h> +#include <linux/ethtool.h> +#include <linux/if_vlan.h> +#include <linux/if_bonding.h> +#include <linux/jiffies.h> +#include <linux/preempt.h> +#include <net/route.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/pkt_sched.h> +#include "bonding.h" +#include "bond_3ad.h" +#include "bond_alb.h" + +/*---------------------------- Module parameters ----------------------------*/ + +/* monitor all links that often (in milliseconds). <=0 disables monitoring */ +#define BOND_LINK_MON_INTERV 0 +#define BOND_LINK_ARP_INTERV 0 + +static int max_bonds = BOND_DEFAULT_MAX_BONDS; +static int tx_queues = BOND_DEFAULT_TX_QUEUES; +static int num_peer_notif = 1; +static int miimon = BOND_LINK_MON_INTERV; +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 = BOND_LINK_ARP_INTERV; +static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; +static char *arp_validate; +static char *fail_over_mac; +static int all_slaves_active = 0; +static struct bond_params bonding_defaults; +static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; + +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"); +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(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"); + +/*----------------------------- 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; + +const struct bond_parm_tbl bond_lacp_tbl[] = { +{ "slow", AD_LACP_SLOW}, +{ "fast", AD_LACP_FAST}, +{ NULL, -1}, +}; + +const struct bond_parm_tbl bond_mode_tbl[] = { +{ "balance-rr", BOND_MODE_ROUNDROBIN}, +{ "active-backup", BOND_MODE_ACTIVEBACKUP}, +{ "balance-xor", BOND_MODE_XOR}, +{ "broadcast", BOND_MODE_BROADCAST}, +{ "802.3ad", BOND_MODE_8023AD}, +{ "balance-tlb", BOND_MODE_TLB}, +{ "balance-alb", BOND_MODE_ALB}, +{ NULL, -1}, +}; + +const struct bond_parm_tbl xmit_hashtype_tbl[] = { +{ "layer2", BOND_XMIT_POLICY_LAYER2}, +{ "layer3+4", BOND_XMIT_POLICY_LAYER34}, +{ "layer2+3", BOND_XMIT_POLICY_LAYER23}, +{ NULL, -1}, +}; + +const struct bond_parm_tbl arp_validate_tbl[] = { +{ "none", BOND_ARP_VALIDATE_NONE}, +{ "active", BOND_ARP_VALIDATE_ACTIVE}, +{ "backup", BOND_ARP_VALIDATE_BACKUP}, +{ "all", BOND_ARP_VALIDATE_ALL}, +{ NULL, -1}, +}; + +const struct bond_parm_tbl fail_over_mac_tbl[] = { +{ "none", BOND_FOM_NONE}, +{ "active", BOND_FOM_ACTIVE}, +{ "follow", BOND_FOM_FOLLOW}, +{ NULL, -1}, +}; + +const struct bond_parm_tbl pri_reselect_tbl[] = { +{ "always", BOND_PRI_RESELECT_ALWAYS}, +{ "better", BOND_PRI_RESELECT_BETTER}, +{ "failure", BOND_PRI_RESELECT_FAILURE}, +{ NULL, -1}, +}; + +struct bond_parm_tbl ad_select_tbl[] = { +{ "stable", BOND_AD_STABLE}, +{ "bandwidth", BOND_AD_BANDWIDTH}, +{ "count", BOND_AD_COUNT}, +{ NULL, -1}, +}; + +/*-------------------------- Forward declarations ---------------------------*/ + +static int bond_init(struct net_device *bond_dev); +static void bond_uninit(struct net_device *bond_dev); + +/*---------------------------- General routines -----------------------------*/ + +const char *bond_mode_name(int mode) +{ + static const char *names[] = { + [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", + [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", + [BOND_MODE_XOR] = "load balancing (xor)", + [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", + [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", + [BOND_MODE_TLB] = "transmit load balancing", + [BOND_MODE_ALB] = "adaptive load balancing", + }; + + if (mode < 0 || mode > BOND_MODE_ALB) + return "unknown"; + + return names[mode]; +} + +/*---------------------------------- VLAN -----------------------------------*/ + +/** + * bond_add_vlan - add a new vlan id on bond + * @bond: bond that got the notification + * @vlan_id: the vlan id to add + * + * Returns -ENOMEM if allocation failed. + */ +static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) +{ + struct vlan_entry *vlan; + + pr_debug("bond: %s, vlan id %d\n", + (bond ? bond->dev->name : "None"), vlan_id); + + vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL); + if (!vlan) + return -ENOMEM; + + INIT_LIST_HEAD(&vlan->vlan_list); + vlan->vlan_id = vlan_id; + + write_lock_bh(&bond->lock); + + list_add_tail(&vlan->vlan_list, &bond->vlan_list); + + write_unlock_bh(&bond->lock); + + pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); + + return 0; +} + +/** + * bond_del_vlan - delete a vlan id from bond + * @bond: bond that got the notification + * @vlan_id: the vlan id to delete + * + * returns -ENODEV if @vlan_id was not found in @bond. + */ +static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) +{ + struct vlan_entry *vlan; + int res = -ENODEV; + + pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); + + block_netpoll_tx(); + write_lock_bh(&bond->lock); + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + if (vlan->vlan_id == vlan_id) { + list_del(&vlan->vlan_list); + + if (bond_is_lb(bond)) + bond_alb_clear_vlan(bond, vlan_id); + + pr_debug("removed VLAN ID %d from bond %s\n", + vlan_id, bond->dev->name); + + kfree(vlan); + + res = 0; + goto out; + } + } + + pr_debug("couldn't find VLAN ID %d in bond %s\n", + vlan_id, bond->dev->name); + +out: + write_unlock_bh(&bond->lock); + unblock_netpoll_tx(); + return res; +} + +/** + * bond_next_vlan - safely skip to the next item in the vlans list. + * @bond: the bond we're working on + * @curr: item we're advancing from + * + * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, + * or @curr->next otherwise (even if it is @curr itself again). + * + * Caller must hold bond->lock + */ +struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) +{ + struct vlan_entry *next, *last; + + if (list_empty(&bond->vlan_list)) + return NULL; + + if (!curr) { + next = list_entry(bond->vlan_list.next, + struct vlan_entry, vlan_list); + } else { + last = list_entry(bond->vlan_list.prev, + struct vlan_entry, vlan_list); + if (last == curr) { + next = list_entry(bond->vlan_list.next, + struct vlan_entry, vlan_list); + } else { + next = list_entry(curr->vlan_list.next, + struct vlan_entry, vlan_list); + } + } + + return next; +} + +/** + * bond_dev_queue_xmit - Prepare skb for xmit. + * + * @bond: bond device that got this skb for tx. + * @skb: hw accel VLAN tagged skb to transmit + * @slave_dev: slave that is supposed to xmit this skbuff + */ +int 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)->bond_queue_mapping)); + skb->queue_mapping = qdisc_skb_cb(skb)->bond_queue_mapping; + + if (unlikely(netpoll_tx_running(slave_dev))) + bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); + else + dev_queue_xmit(skb); + + return 0; +} + +/* + * 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, uint16_t vid) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *stop_at; + int i, res; + + bond_for_each_slave(bond, slave, i) { + res = vlan_vid_add(slave->dev, vid); + if (res) + goto unwind; + } + + res = bond_add_vlan(bond, vid); + if (res) { + pr_err("%s: Error: Failed to add vlan id %d\n", + bond_dev->name, vid); + return res; + } + + return 0; + +unwind: + /* unwind from head to the slave that failed */ + stop_at = slave; + bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) + vlan_vid_del(slave->dev, 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, uint16_t vid) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + int i, res; + + bond_for_each_slave(bond, slave, i) + vlan_vid_del(slave->dev, vid); + + res = bond_del_vlan(bond, vid); + if (res) { + pr_err("%s: Error: Failed to remove vlan id %d\n", + bond_dev->name, vid); + return res; + } + + return 0; +} + +static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) +{ + struct vlan_entry *vlan; + int res; + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + res = vlan_vid_add(slave_dev, vlan->vlan_id); + if (res) + pr_warning("%s: Failed to add vlan id %d to device %s\n", + bond->dev->name, vlan->vlan_id, + slave_dev->name); + } +} + +static void bond_del_vlans_from_slave(struct bonding *bond, + struct net_device *slave_dev) +{ + struct vlan_entry *vlan; + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + if (!vlan->vlan_id) + continue; + vlan_vid_del(slave_dev, vlan->vlan_id); + } +} + +/*------------------------------- Link status -------------------------------*/ + +/* + * Set the carrier state for the master according to the state of its + * slaves. If any slaves are up, the master is up. In 802.3ad mode, + * do special 802.3ad magic. + * + * Returns zero if carrier state does not change, nonzero if it does. + */ +static int bond_set_carrier(struct bonding *bond) +{ + struct slave *slave; + int i; + + if (bond->slave_cnt == 0) + goto down; + + if (bond->params.mode == BOND_MODE_8023AD) + return bond_3ad_set_carrier(bond); + + bond_for_each_slave(bond, slave, i) { + if (slave->link == BOND_LINK_UP) { + if (!netif_carrier_ok(bond->dev)) { + netif_carrier_on(bond->dev); + return 1; + } + return 0; + } + } + +down: + if (netif_carrier_ok(bond->dev)) { + netif_carrier_off(bond->dev); + return 1; + } + return 0; +} + +/* + * Get link speed and duplex from the slave's base driver + * using ethtool. If for some reason the call fails or the + * values are invalid, set speed and duplex to -1, + * and return error. + */ +static int 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 -1; + + slave_speed = ethtool_cmd_speed(&ecmd); + if (slave_speed == 0 || slave_speed == ((__u32) -1)) + return -1; + + switch (ecmd.duplex) { + case DUPLEX_FULL: + case DUPLEX_HALF: + break; + default: + return -1; + } + + slave->speed = slave_speed; + slave->duplex = ecmd.duplex; + + return 0; +} + +/* + * if <dev> supports MII link status reporting, check its link status. + * + * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), + * 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) { + if (slave_dev->ethtool_ops->get_link) { + u32 link; + + link = slave_dev->ethtool_ops->get_link(slave_dev); + + return link ? 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) +{ + int err = 0; + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + err = dev_set_promiscuity(bond->curr_active_slave->dev, + inc); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + 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) +{ + int err = 0; + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + err = dev_set_allmulti(bond->curr_active_slave->dev, + inc); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + err = dev_set_allmulti(slave->dev, inc); + if (err) + return err; + } + } + return err; +} + +/* + * Add a Multicast address to slaves + * according to mode + */ +static void bond_mc_add(struct bonding *bond, void *addr) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) + dev_mc_add(bond->curr_active_slave->dev, addr); + } else { + struct slave *slave; + int i; + + bond_for_each_slave(bond, slave, i) + dev_mc_add(slave->dev, addr); + } +} + +/* + * Remove a multicast address from slave + * according to mode + */ +static void bond_mc_del(struct bonding *bond, void *addr) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) + dev_mc_del(bond->curr_active_slave->dev, addr); + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + dev_mc_del(slave->dev, addr); + } + } +} + + +static void __bond_resend_igmp_join_requests(struct net_device *dev) +{ + struct in_device *in_dev; + + rcu_read_lock(); + in_dev = __in_dev_get_rcu(dev); + if (in_dev) + ip_mc_rejoin_groups(in_dev); + rcu_read_unlock(); +} + +/* + * Retrieve the list of registered multicast addresses for the bonding + * device and retransmit an IGMP JOIN request to the current active + * slave. + */ +static void bond_resend_igmp_join_requests(struct bonding *bond) +{ + struct net_device *bond_dev, *vlan_dev, *master_dev; + struct vlan_entry *vlan; + + read_lock(&bond->lock); + + bond_dev = bond->dev; + + /* rejoin all groups on bond device */ + __bond_resend_igmp_join_requests(bond_dev); + + /* + * if bond is enslaved to a bridge, + * then rejoin all groups on its master + */ + master_dev = bond_dev->master; + if (master_dev) + if ((master_dev->priv_flags & IFF_EBRIDGE) + && (bond_dev->priv_flags & IFF_BRIDGE_PORT)) + __bond_resend_igmp_join_requests(master_dev); + + /* rejoin all groups on vlan devices */ + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + rcu_read_lock(); + vlan_dev = __vlan_find_dev_deep(bond_dev, + vlan->vlan_id); + rcu_read_unlock(); + if (vlan_dev) + __bond_resend_igmp_join_requests(vlan_dev); + } + + if (--bond->igmp_retrans > 0) + queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); + + read_unlock(&bond->lock); +} + +static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + mcast_work.work); + bond_resend_igmp_join_requests(bond); +} + +/* + * flush all members of flush->mc_list from device dev->mc_list + */ +static void bond_mc_list_flush(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct netdev_hw_addr *ha; + + netdev_for_each_mc_addr(ha, bond_dev) + dev_mc_del(slave_dev, ha->addr); + + if (bond->params.mode == BOND_MODE_8023AD) { + /* del lacpdu mc addr from mc list */ + u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; + + dev_mc_del(slave_dev, lacpdu_multicast); + } +} + +/*--------------------------- Active slave change ---------------------------*/ + +/* + * Update the mc list and multicast-related flags for the new and + * old active slaves (if any) according to the multicast mode, and + * promiscuous flags unconditionally. + */ +static void bond_mc_swap(struct bonding *bond, struct slave *new_active, + struct slave *old_active) +{ + struct netdev_hw_addr *ha; + + if (!USES_PRIMARY(bond->params.mode)) + /* nothing to do - mc list is already up-to-date on + * all slaves + */ + return; + + if (old_active) { + if (bond->dev->flags & IFF_PROMISC) + dev_set_promiscuity(old_active->dev, -1); + + if (bond->dev->flags & IFF_ALLMULTI) + dev_set_allmulti(old_active->dev, -1); + + netdev_for_each_mc_addr(ha, bond->dev) + dev_mc_del(old_active->dev, ha->addr); + } + + 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); + + netdev_for_each_mc_addr(ha, bond->dev) + dev_mc_add(new_active->dev, ha->addr); + } +} + +/* + * bond_do_fail_over_mac + * + * Perform special MAC address swapping for fail_over_mac settings + * + * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. + */ +static void bond_do_fail_over_mac(struct bonding *bond, + struct slave *new_active, + struct slave *old_active) + __releases(&bond->curr_slave_lock) + __releases(&bond->lock) + __acquires(&bond->lock) + __acquires(&bond->curr_slave_lock) +{ + u8 tmp_mac[ETH_ALEN]; + struct sockaddr saddr; + int rv; + + switch (bond->params.fail_over_mac) { + case BOND_FOM_ACTIVE: + if (new_active) { + memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, + new_active->dev->addr_len); + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); + call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); + } + break; + case BOND_FOM_FOLLOW: + /* + * if new_active && old_active, swap them + * if just old_active, do nothing (going to no active slave) + * if just new_active, set new_active to bond's MAC + */ + if (!new_active) + return; + + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); + + if (old_active) { + memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); + memcpy(saddr.sa_data, old_active->dev->dev_addr, + ETH_ALEN); + saddr.sa_family = new_active->dev->type; + } else { + memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); + saddr.sa_family = bond->dev->type; + } + + rv = dev_set_mac_address(new_active->dev, &saddr); + if (rv) { + pr_err("%s: Error %d setting MAC of slave %s\n", + bond->dev->name, -rv, new_active->dev->name); + goto out; + } + + if (!old_active) + goto out; + + memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); + saddr.sa_family = old_active->dev->type; + + rv = dev_set_mac_address(old_active->dev, &saddr); + if (rv) + pr_err("%s: Error %d setting MAC of slave %s\n", + bond->dev->name, -rv, new_active->dev->name); +out: + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); + break; + default: + pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", + bond->dev->name, bond->params.fail_over_mac); + break; + } + +} + +static bool bond_should_change_active(struct bonding *bond) +{ + struct slave *prim = bond->primary_slave; + struct slave *curr = bond->curr_active_slave; + + if (!prim || !curr || curr->link != BOND_LINK_UP) + return true; + if (bond->force_primary) { + bond->force_primary = false; + return true; + } + if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && + (prim->speed < curr->speed || + (prim->speed == curr->speed && prim->duplex <= curr->duplex))) + return false; + if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) + return false; + return true; +} + +/** + * find_best_interface - select the best available slave to be the active one + * @bond: our bonding struct + * + * Warning: Caller must hold curr_slave_lock for writing. + */ +static struct slave *bond_find_best_slave(struct bonding *bond) +{ + struct slave *new_active, *old_active; + struct slave *bestslave = NULL; + int mintime = bond->params.updelay; + int i; + + new_active = bond->curr_active_slave; + + if (!new_active) { /* there were no active slaves left */ + if (bond->slave_cnt > 0) /* found one slave */ + new_active = bond->first_slave; + else + return NULL; /* still no slave, return NULL */ + } + + if ((bond->primary_slave) && + bond->primary_slave->link == BOND_LINK_UP && + bond_should_change_active(bond)) { + new_active = bond->primary_slave; + } + + /* remember where to stop iterating over the slaves */ + old_active = new_active; + + bond_for_each_slave_from(bond, new_active, i, old_active) { + if (new_active->link == BOND_LINK_UP) { + return new_active; + } else if (new_active->link == BOND_LINK_BACK && + IS_UP(new_active->dev)) { + /* link up, but waiting for stabilization */ + if (new_active->delay < mintime) { + mintime = new_active->delay; + bestslave = new_active; + } + } + } + + return bestslave; +} + +static bool bond_should_notify_peers(struct bonding *bond) +{ + struct slave *slave = bond->curr_active_slave; + + pr_debug("bond_should_notify_peers: bond %s slave %s\n", + bond->dev->name, slave ? slave->dev->name : "NULL"); + + if (!slave || !bond->send_peer_notif || + test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) + return false; + + bond->send_peer_notif--; + return true; +} + +/** + * change_active_interface - change the active slave into the specified one + * @bond: our bonding struct + * @new: the new slave to make the active one + * + * Set the new slave to the bond's settings and unset them on the old + * curr_active_slave. + * Setting include flags, mc-list, promiscuity, allmulti, etc. + * + * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, + * because it is apparently the best available slave we have, even though its + * updelay hasn't timed out yet. + * + * If new_active is not NULL, caller must hold bond->lock for read and + * curr_slave_lock for write_bh. + */ +void bond_change_active_slave(struct bonding *bond, struct slave *new_active) +{ + struct slave *old_active = bond->curr_active_slave; + + if (old_active == new_active) + return; + + if (new_active) { + new_active->jiffies = jiffies; + + if (new_active->link == BOND_LINK_BACK) { + if (USES_PRIMARY(bond->params.mode)) { + pr_info("%s: making interface %s the new active one %d ms earlier.\n", + bond->dev->name, new_active->dev->name, + (bond->params.updelay - new_active->delay) * bond->params.miimon); + } + + new_active->delay = 0; + new_active->link = BOND_LINK_UP; + + if (bond->params.mode == BOND_MODE_8023AD) + bond_3ad_handle_link_change(new_active, BOND_LINK_UP); + + if (bond_is_lb(bond)) + bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); + } else { + if (USES_PRIMARY(bond->params.mode)) { + pr_info("%s: making interface %s the new active one.\n", + bond->dev->name, new_active->dev->name); + } + } + } + + if (USES_PRIMARY(bond->params.mode)) + bond_mc_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); + if (new_active) + bond_set_slave_active_flags(new_active); + } else { + bond->curr_active_slave = new_active; + } + + if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { + if (old_active) + bond_set_slave_inactive_flags(old_active); + + if (new_active) { + bool should_notify_peers = false; + + bond_set_slave_active_flags(new_active); + + if (bond->params.fail_over_mac) + bond_do_fail_over_mac(bond, new_active, + old_active); + + if (netif_running(bond->dev)) { + bond->send_peer_notif = + bond->params.num_peer_notif; + should_notify_peers = + bond_should_notify_peers(bond); + } + + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); + + netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER); + if (should_notify_peers) + netdev_bonding_change(bond->dev, + NETDEV_NOTIFY_PEERS); + + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); + } + } + + /* resend IGMP joins since active slave has changed or + * all were sent on curr_active_slave. + * resend only if bond is brought up with the affected + * bonding modes and the retransmission is enabled */ + if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && + ((USES_PRIMARY(bond->params.mode) && new_active) || + bond->params.mode == BOND_MODE_ROUNDROBIN)) { + bond->igmp_retrans = bond->params.resend_igmp; + queue_delayed_work(bond->wq, &bond->mcast_work, 0); + } +} + +/** + * 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 bond->lock for read and curr_slave_lock for write_bh. + */ +void bond_select_active_slave(struct bonding *bond) +{ + struct slave *best_slave; + int rv; + + best_slave = bond_find_best_slave(bond); + if (best_slave != bond->curr_active_slave) { + bond_change_active_slave(bond, best_slave); + rv = bond_set_carrier(bond); + if (!rv) + return; + + if (netif_carrier_ok(bond->dev)) { + pr_info("%s: first active interface up!\n", + bond->dev->name); + } else { + pr_info("%s: now running without any active interface !\n", + bond->dev->name); + } + } +} + +/*--------------------------- slave list handling ---------------------------*/ + +/* + * This function attaches the slave to the end of list. + * + * bond->lock held for writing by caller. + */ +static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) +{ + if (bond->first_slave == NULL) { /* attaching the first slave */ + new_slave->next = new_slave; + new_slave->prev = new_slave; + bond->first_slave = new_slave; + } else { + new_slave->next = bond->first_slave; + new_slave->prev = bond->first_slave->prev; + new_slave->next->prev = new_slave; + new_slave->prev->next = new_slave; + } + + bond->slave_cnt++; +} + +/* + * This function detaches the slave from the list. + * WARNING: no check is made to verify if the slave effectively + * belongs to <bond>. + * Nothing is freed on return, structures are just unchained. + * If any slave pointer in bond was pointing to <slave>, + * it should be changed by the calling function. + * + * bond->lock held for writing by caller. + */ +static void bond_detach_slave(struct bonding *bond, struct slave *slave) +{ + if (slave->next) + slave->next->prev = slave->prev; + + if (slave->prev) + slave->prev->next = slave->next; + + if (bond->first_slave == slave) { /* slave is the first slave */ + if (bond->slave_cnt > 1) { /* there are more slave */ + bond->first_slave = slave->next; + } else { + bond->first_slave = NULL; /* slave was the last one */ + } + } + + slave->next = NULL; + slave->prev = NULL; + bond->slave_cnt--; +} + +#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; + + np->dev = slave->dev; + strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ); + err = __netpoll_setup(np); + 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; + synchronize_rcu_bh(); + __netpoll_cleanup(np); + kfree(np); +} +static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) +{ + if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) + return false; + if (!slave_dev->netdev_ops->ndo_poll_controller) + return false; + return true; +} + +static void bond_poll_controller(struct net_device *bond_dev) +{ +} + +static void __bond_netpoll_cleanup(struct bonding *bond) +{ + struct slave *slave; + int i; + + bond_for_each_slave(bond, slave, i) + if (IS_UP(slave->dev)) + slave_disable_netpoll(slave); +} +static void bond_netpoll_cleanup(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + + read_lock(&bond->lock); + __bond_netpoll_cleanup(bond); + read_unlock(&bond->lock); +} + +static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) +{ + struct bonding *bond = netdev_priv(dev); + struct slave *slave; + int i, err = 0; + + read_lock(&bond->lock); + bond_for_each_slave(bond, slave, i) { + err = slave_enable_netpoll(slave); + if (err) { + __bond_netpoll_cleanup(bond); + break; + } + } + read_unlock(&bond->lock); + return err; +} + +static struct netpoll_info *bond_netpoll_info(struct bonding *bond) +{ + return bond->dev->npinfo; +} + +#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 int bond_sethwaddr(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + pr_debug("bond_dev=%p\n", bond_dev); + pr_debug("slave_dev=%p\n", slave_dev); + pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); + memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); + return 0; +} + +static netdev_features_t bond_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct slave *slave; + struct bonding *bond = netdev_priv(dev); + netdev_features_t mask; + int i; + + read_lock(&bond->lock); + + if (!bond->first_slave) { + /* Disable adding VLANs to empty bond. But why? --mq */ + features |= NETIF_F_VLAN_CHALLENGED; + goto out; + } + + mask = features; + features &= ~NETIF_F_ONE_FOR_ALL; + features |= NETIF_F_ALL_FOR_ALL; + + bond_for_each_slave(bond, slave, i) { + features = netdev_increment_features(features, + slave->dev->features, + mask); + } + +out: + read_unlock(&bond->lock); + return features; +} + +#define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ + NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ + NETIF_F_HIGHDMA | NETIF_F_LRO) + +static void bond_compute_features(struct bonding *bond) +{ + struct slave *slave; + struct net_device *bond_dev = bond->dev; + netdev_features_t vlan_features = BOND_VLAN_FEATURES; + unsigned short max_hard_header_len = ETH_HLEN; + int i; + + read_lock(&bond->lock); + + if (!bond->first_slave) + goto done; + + bond_for_each_slave(bond, slave, i) { + vlan_features = netdev_increment_features(vlan_features, + slave->dev->vlan_features, BOND_VLAN_FEATURES); + + if (slave->dev->hard_header_len > max_hard_header_len) + max_hard_header_len = slave->dev->hard_header_len; + } + +done: + bond_dev->vlan_features = vlan_features; + bond_dev->hard_header_len = max_hard_header_len; + + read_unlock(&bond->lock); + + netdev_change_features(bond_dev); +} + +static void bond_setup_by_slave(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_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); + bond->setup_by_slave = 1; +} + +/* On bonding slaves other than the currently active slave, suppress + * duplicates except for alb non-mcast/bcast. + */ +static bool bond_should_deliver_exact_match(struct sk_buff *skb, + struct slave *slave, + struct bonding *bond) +{ + if (bond_is_slave_inactive(slave)) { + if (bond->params.mode == BOND_MODE_ALB && + skb->pkt_type != PACKET_BROADCAST && + skb->pkt_type != PACKET_MULTICAST) + return false; + return true; + } + return false; +} + +static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + struct slave *slave; + struct bonding *bond; + int (*recv_probe)(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; + + if (bond->params.arp_interval) + slave->dev->last_rx = jiffies; + + recv_probe = ACCESS_ONCE(bond->recv_probe); + if (recv_probe) { + struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); + + if (likely(nskb)) { + ret = recv_probe(nskb, bond, slave); + dev_kfree_skb(nskb); + if (ret == RX_HANDLER_CONSUMED) { + consume_skb(skb); + return ret; + } + } + } + + if (bond_should_deliver_exact_match(skb, slave, bond)) { + return RX_HANDLER_EXACT; + } + + skb->dev = bond->dev; + + if (bond->params.mode == BOND_MODE_ALB && + bond->dev->priv_flags & IFF_BRIDGE_PORT && + skb->pkt_type == PACKET_HOST) { + + if (unlikely(skb_cow_head(skb, + skb->data - skb_mac_header(skb)))) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); + } + + return ret; +} + +/* 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; + struct netdev_hw_addr *ha; + struct sockaddr addr; + int link_reporting; + int res = 0; + + if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && + slave_ops->ndo_do_ioctl == NULL) { + pr_warning("%s: Warning: no link monitoring support for %s\n", + bond_dev->name, slave_dev->name); + } + + /* already enslaved */ + if (slave_dev->flags & IFF_SLAVE) { + pr_debug("Error, Device was already enslaved\n"); + return -EBUSY; + } + + /* vlan challenged mutual exclusion */ + /* no need to lock since we're protected by rtnl_lock */ + if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { + pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); + if (bond_vlan_used(bond)) { + pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", + bond_dev->name, slave_dev->name, bond_dev->name); + return -EPERM; + } else { + pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", + bond_dev->name, slave_dev->name, + slave_dev->name, bond_dev->name); + } + } else { + pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); + } + + /* + * Old ifenslave binaries are no longer supported. These can + * be identified with moderate accuracy by the state of the slave: + * the current ifenslave will set the interface down prior to + * enslaving it; the old ifenslave will not. + */ + if ((slave_dev->flags & IFF_UP)) { + pr_err("%s is up. This may be due to an out of date ifenslave.\n", + slave_dev->name); + res = -EPERM; + goto err_undo_flags; + } + + /* set bonding device ether type by slave - bonding netdevices are + * created with ether_setup, so when the slave type is not ARPHRD_ETHER + * there is a need to override some of the type dependent attribs/funcs. + * + * bond ether type mutual exclusion - don't allow slaves of dissimilar + * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond + */ + if (bond->slave_cnt == 0) { + if (bond_dev->type != slave_dev->type) { + pr_debug("%s: change device type from %d to %d\n", + bond_dev->name, + bond_dev->type, slave_dev->type); + + res = netdev_bonding_change(bond_dev, + NETDEV_PRE_TYPE_CHANGE); + res = notifier_to_errno(res); + if (res) { + pr_err("%s: refused to change device type\n", + bond_dev->name); + res = -EBUSY; + goto err_undo_flags; + } + + /* Flush unicast and multicast addresses */ + dev_uc_flush(bond_dev); + dev_mc_flush(bond_dev); + + if (slave_dev->type != ARPHRD_ETHER) + bond_setup_by_slave(bond_dev, slave_dev); + else { + ether_setup(bond_dev); + bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; + } + + netdev_bonding_change(bond_dev, + NETDEV_POST_TYPE_CHANGE); + } + } else if (bond_dev->type != slave_dev->type) { + pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", + slave_dev->name, + slave_dev->type, bond_dev->type); + res = -EINVAL; + goto err_undo_flags; + } + + if (slave_ops->ndo_set_mac_address == NULL) { + if (bond->slave_cnt == 0) { + pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", + bond_dev->name); + bond->params.fail_over_mac = BOND_FOM_ACTIVE; + } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { + pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n", + bond_dev->name); + res = -EOPNOTSUPP; + goto err_undo_flags; + } + } + + call_netdevice_notifiers(NETDEV_JOIN, slave_dev); + + /* If this is the first slave, then we need to set the master's hardware + * address to be the same as the slave's. */ + if (is_zero_ether_addr(bond->dev->dev_addr)) + memcpy(bond->dev->dev_addr, slave_dev->dev_addr, + slave_dev->addr_len); + + + new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); + if (!new_slave) { + res = -ENOMEM; + goto err_undo_flags; + } + + /* + * Set the new_slave's queue_id to be zero. Queue ID mapping + * is set via sysfs or module option if desired. + */ + new_slave->queue_id = 0; + + /* Save slave's original mtu and then set it to match the bond */ + new_slave->original_mtu = slave_dev->mtu; + res = dev_set_mtu(slave_dev, bond->dev->mtu); + if (res) { + pr_debug("Error %d calling dev_set_mtu\n", res); + goto err_free; + } + + /* + * Save slave's original ("permanent") mac address for modes + * that need it, and for restoring it upon release, and then + * set it to the master's address + */ + memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); + + if (!bond->params.fail_over_mac) { + /* + * Set slave to master's mac address. The application already + * set the master's mac address to that of the first slave + */ + memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); + addr.sa_family = slave_dev->type; + res = dev_set_mac_address(slave_dev, &addr); + if (res) { + pr_debug("Error %d calling set_mac_address\n", res); + goto err_restore_mtu; + } + } + + res = netdev_set_bond_master(slave_dev, bond_dev); + if (res) { + pr_debug("Error %d calling netdev_set_bond_master\n", res); + goto err_restore_mac; + } + + /* open the slave since the application closed it */ + res = dev_open(slave_dev); + if (res) { + pr_debug("Opening slave %s failed\n", slave_dev->name); + goto err_unset_master; + } + + new_slave->bond = bond; + new_slave->dev = slave_dev; + slave_dev->priv_flags |= IFF_BONDING; + + if (bond_is_lb(bond)) { + /* bond_alb_init_slave() must be called before all other stages since + * it might fail and we do not want to have to undo everything + */ + res = bond_alb_init_slave(bond, new_slave); + if (res) + goto err_close; + } + + /* If the mode USES_PRIMARY, then the new slave gets the + * master's promisc (and mc) settings only if it becomes the + * curr_active_slave, and that is taken care of later when calling + * bond_change_active() + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* set promiscuity level to new slave */ + if (bond_dev->flags & IFF_PROMISC) { + 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); + /* upload master's mc_list to new slave */ + netdev_for_each_mc_addr(ha, bond_dev) + dev_mc_add(slave_dev, ha->addr); + netif_addr_unlock_bh(bond_dev); + } + + if (bond->params.mode == BOND_MODE_8023AD) { + /* add lacpdu mc addr to mc list */ + u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; + + dev_mc_add(slave_dev, lacpdu_multicast); + } + + bond_add_vlans_on_slave(bond, slave_dev); + + write_lock_bh(&bond->lock); + + bond_attach_slave(bond, new_slave); + + new_slave->delay = 0; + new_slave->link_failure_count = 0; + + write_unlock_bh(&bond->lock); + + bond_compute_features(bond); + + read_lock(&bond->lock); + + new_slave->last_arp_rx = jiffies; + + if (bond->params.miimon && !bond->params.use_carrier) { + link_reporting = bond_check_dev_link(bond, slave_dev, 1); + + if ((link_reporting == -1) && !bond->params.arp_interval) { + /* + * miimon is set but a bonded network driver + * does not support ETHTOOL/MII and + * arp_interval is not set. Note: if + * use_carrier is enabled, we will never go + * here (because netif_carrier is always + * supported); thus, we don't need to change + * the messages for netif_carrier. + */ + pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n", + bond_dev->name, slave_dev->name); + } else if (link_reporting == -1) { + /* unable get link status using mii/ethtool */ + pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n", + bond_dev->name, slave_dev->name); + } + } + + /* check for initial state */ + if (!bond->params.miimon || + (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { + if (bond->params.updelay) { + pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n"); + new_slave->link = BOND_LINK_BACK; + new_slave->delay = bond->params.updelay; + } else { + pr_debug("Initial state of slave_dev is BOND_LINK_UP\n"); + new_slave->link = BOND_LINK_UP; + } + new_slave->jiffies = jiffies; + } else { + pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n"); + new_slave->link = BOND_LINK_DOWN; + } + + bond_update_speed_duplex(new_slave); + + if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { + /* if there is a primary slave, remember it */ + if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { + bond->primary_slave = new_slave; + bond->force_primary = true; + } + } + + write_lock_bh(&bond->curr_slave_lock); + + switch (bond->params.mode) { + case BOND_MODE_ACTIVEBACKUP: + bond_set_slave_inactive_flags(new_slave); + bond_select_active_slave(bond); + break; + case BOND_MODE_8023AD: + /* in 802.3ad mode, the internal mechanism + * will activate the slaves in the selected + * aggregator + */ + bond_set_slave_inactive_flags(new_slave); + /* if this is the first slave */ + if (bond->slave_cnt == 1) { + SLAVE_AD_INFO(new_slave).id = 1; + /* Initialize AD with the number of times that the AD timer is called in 1 second + * can be called only after the mac address of the bond is set + */ + bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); + } else { + SLAVE_AD_INFO(new_slave).id = + SLAVE_AD_INFO(new_slave->prev).id + 1; + } + + bond_3ad_bind_slave(new_slave); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + bond_set_active_slave(new_slave); + bond_set_slave_inactive_flags(new_slave); + bond_select_active_slave(bond); + break; + default: + pr_debug("This slave is always active in trunk mode\n"); + + /* always active in trunk mode */ + bond_set_active_slave(new_slave); + + /* In trunking mode there is little meaning to curr_active_slave + * anyway (it holds no special properties of the bond device), + * so we can change it without calling change_active_interface() + */ + if (!bond->curr_active_slave) + bond->curr_active_slave = new_slave; + + break; + } /* switch(bond_mode) */ + + write_unlock_bh(&bond->curr_slave_lock); + + bond_set_carrier(bond); + +#ifdef CONFIG_NET_POLL_CONTROLLER + slave_dev->npinfo = bond_netpoll_info(bond); + if (slave_dev->npinfo) { + if (slave_enable_netpoll(new_slave)) { + read_unlock(&bond->lock); + pr_info("Error, %s: master_dev is using netpoll, " + "but new slave device does not support netpoll.\n", + bond_dev->name); + res = -EBUSY; + goto err_detach; + } + } +#endif + + read_unlock(&bond->lock); + + res = bond_create_slave_symlinks(bond_dev, slave_dev); + if (res) + goto err_detach; + + res = netdev_rx_handler_register(slave_dev, bond_handle_frame, + new_slave); + if (res) { + pr_debug("Error %d calling netdev_rx_handler_register\n", res); + goto err_dest_symlinks; + } + + pr_info("%s: enslaving %s as a%s interface with a%s link.\n", + bond_dev->name, slave_dev->name, + bond_is_active_slave(new_slave) ? "n active" : " backup", + new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); + + /* enslave is successful */ + return 0; + +/* Undo stages on error */ +err_dest_symlinks: + bond_destroy_slave_symlinks(bond_dev, slave_dev); + +err_detach: + write_lock_bh(&bond->lock); + bond_detach_slave(bond, new_slave); + write_unlock_bh(&bond->lock); + +err_close: + dev_close(slave_dev); + +err_unset_master: + netdev_set_bond_master(slave_dev, NULL); + +err_restore_mac: + if (!bond->params.fail_over_mac) { + /* 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. + */ + memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); + addr.sa_family = slave_dev->type; + dev_set_mac_address(slave_dev, &addr); + } + +err_restore_mtu: + dev_set_mtu(slave_dev, new_slave->original_mtu); + +err_free: + kfree(new_slave); + +err_undo_flags: + bond_compute_features(bond); + + return res; +} + +/* + * Try to release the slave device <slave> from the bond device <master> + * It is legal to access curr_active_slave without a lock because all the function + * is write-locked. + * + * The rules for slave state should be: + * for Active/Backup: + * Active stays on all backups go down + * for Bonded connections: + * The first up interface should be left on and all others downed. + */ +int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *oldcurrent; + struct sockaddr addr; + 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) || + (slave_dev->master != bond_dev)) { + pr_err("%s: Error: cannot release %s.\n", + bond_dev->name, slave_dev->name); + return -EINVAL; + } + + block_netpoll_tx(); + netdev_bonding_change(bond_dev, NETDEV_RELEASE); + write_lock_bh(&bond->lock); + + slave = bond_get_slave_by_dev(bond, slave_dev); + if (!slave) { + /* not a slave of this bond */ + pr_info("%s: %s not enslaved\n", + bond_dev->name, slave_dev->name); + write_unlock_bh(&bond->lock); + unblock_netpoll_tx(); + return -EINVAL; + } + + /* unregister rx_handler early so bond_handle_frame wouldn't be called + * for this slave anymore. + */ + netdev_rx_handler_unregister(slave_dev); + write_unlock_bh(&bond->lock); + synchronize_net(); + write_lock_bh(&bond->lock); + + if (!bond->params.fail_over_mac) { + if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) && + bond->slave_cnt > 1) + pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n", + bond_dev->name, slave_dev->name, + slave->perm_hwaddr, + bond_dev->name, slave_dev->name); + } + + /* Inform AD package of unbinding of slave. */ + if (bond->params.mode == BOND_MODE_8023AD) { + /* must be called before the slave is + * detached from the list + */ + bond_3ad_unbind_slave(slave); + } + + pr_info("%s: releasing %s interface %s\n", + bond_dev->name, + bond_is_active_slave(slave) ? "active" : "backup", + slave_dev->name); + + oldcurrent = bond->curr_active_slave; + + bond->current_arp_slave = NULL; + + /* release the slave from its bond */ + bond_detach_slave(bond, slave); + + if (bond->primary_slave == slave) + 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. + */ + write_unlock_bh(&bond->lock); + bond_alb_deinit_slave(bond, slave); + write_lock_bh(&bond->lock); + } + + if (oldcurrent == slave) { + /* + * Note that we hold RTNL over this sequence, so there + * is no concern that another slave add/remove event + * will interfere. + */ + write_unlock_bh(&bond->lock); + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); + + bond_select_active_slave(bond); + + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); + write_lock_bh(&bond->lock); + } + + if (bond->slave_cnt == 0) { + bond_set_carrier(bond); + + /* if the last slave was removed, zero the mac address + * of the master so it will be set by the application + * to the mac address of the first slave + */ + memset(bond_dev->dev_addr, 0, bond_dev->addr_len); + + if (bond_vlan_used(bond)) { + pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", + bond_dev->name, bond_dev->name); + pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", + bond_dev->name); + } + } + + write_unlock_bh(&bond->lock); + unblock_netpoll_tx(); + + if (bond->slave_cnt == 0) + call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); + + bond_compute_features(bond); + if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && + (old_features & NETIF_F_VLAN_CHALLENGED)) + pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", + bond_dev->name, slave_dev->name, bond_dev->name); + + /* must do this from outside any spinlocks */ + bond_destroy_slave_symlinks(bond_dev, slave_dev); + + bond_del_vlans_from_slave(bond, slave_dev); + + /* If the mode USES_PRIMARY, then we should only remove its + * promisc and mc settings if it was the curr_active_slave, but that was + * already taken care of above when we detached the slave + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* unset promiscuity level from slave */ + if (bond_dev->flags & IFF_PROMISC) + dev_set_promiscuity(slave_dev, -1); + + /* unset allmulti level from slave */ + if (bond_dev->flags & IFF_ALLMULTI) + dev_set_allmulti(slave_dev, -1); + + /* flush master's mc_list from slave */ + netif_addr_lock_bh(bond_dev); + bond_mc_list_flush(bond_dev, slave_dev); + netif_addr_unlock_bh(bond_dev); + } + + netdev_set_bond_master(slave_dev, NULL); + + slave_disable_netpoll(slave); + + /* close slave before restoring its mac address */ + dev_close(slave_dev); + + if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { + /* restore original ("permanent") mac address */ + memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); + addr.sa_family = slave_dev->type; + dev_set_mac_address(slave_dev, &addr); + } + + dev_set_mtu(slave_dev, slave->original_mtu); + + slave_dev->priv_flags &= ~IFF_BONDING; + + kfree(slave); + + return 0; /* deletion OK */ +} + +/* +* 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->slave_cnt == 0)) { + bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; + pr_info("%s: destroying bond %s.\n", + bond_dev->name, bond_dev->name); + unregister_netdevice(bond_dev); + } + return ret; +} + +/* + * This function releases all slaves. + */ +static int bond_release_all(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + struct net_device *slave_dev; + struct sockaddr addr; + + write_lock_bh(&bond->lock); + + netif_carrier_off(bond_dev); + + if (bond->slave_cnt == 0) + goto out; + + bond->current_arp_slave = NULL; + bond->primary_slave = NULL; + bond_change_active_slave(bond, NULL); + + while ((slave = bond->first_slave) != NULL) { + /* Inform AD package of unbinding of slave + * before slave is detached from the list. + */ + if (bond->params.mode == BOND_MODE_8023AD) + bond_3ad_unbind_slave(slave); + + slave_dev = slave->dev; + bond_detach_slave(bond, slave); + + /* now that the slave is detached, unlock and perform + * all the undo steps that should not be called from + * within a lock. + */ + write_unlock_bh(&bond->lock); + + /* unregister rx_handler early so bond_handle_frame wouldn't + * be called for this slave anymore. + */ + netdev_rx_handler_unregister(slave_dev); + synchronize_net(); + + if (bond_is_lb(bond)) { + /* must be called only after the slave + * has been detached from the list + */ + bond_alb_deinit_slave(bond, slave); + } + + bond_destroy_slave_symlinks(bond_dev, slave_dev); + bond_del_vlans_from_slave(bond, slave_dev); + + /* If the mode USES_PRIMARY, then we should only remove its + * promisc and mc settings if it was the curr_active_slave, but that was + * already taken care of above when we detached the slave + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* unset promiscuity level from slave */ + if (bond_dev->flags & IFF_PROMISC) + dev_set_promiscuity(slave_dev, -1); + + /* unset allmulti level from slave */ + if (bond_dev->flags & IFF_ALLMULTI) + dev_set_allmulti(slave_dev, -1); + + /* flush master's mc_list from slave */ + netif_addr_lock_bh(bond_dev); + bond_mc_list_flush(bond_dev, slave_dev); + netif_addr_unlock_bh(bond_dev); + } + + netdev_set_bond_master(slave_dev, NULL); + + slave_disable_netpoll(slave); + + /* close slave before restoring its mac address */ + dev_close(slave_dev); + + if (!bond->params.fail_over_mac) { + /* restore original ("permanent") mac address*/ + memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); + addr.sa_family = slave_dev->type; + dev_set_mac_address(slave_dev, &addr); + } + + kfree(slave); + + /* re-acquire the lock before getting the next slave */ + write_lock_bh(&bond->lock); + } + + /* zero the mac address of the master so it will be + * set by the application to the mac address of the + * first slave + */ + memset(bond_dev->dev_addr, 0, bond_dev->addr_len); + + if (bond_vlan_used(bond)) { + pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", + bond_dev->name, bond_dev->name); + pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", + bond_dev->name); + } + + pr_info("%s: released all slaves\n", bond_dev->name); + +out: + write_unlock_bh(&bond->lock); + + bond_compute_features(bond); + + return 0; +} + +/* + * This function changes the active slave to slave <slave_dev>. + * It returns -EINVAL in the following cases. + * - <slave_dev> is not found in the list. + * - There is not active slave now. + * - <slave_dev> is already active. + * - The link state of <slave_dev> is not BOND_LINK_UP. + * - <slave_dev> is not running. + * In these cases, this function does nothing. + * In the other cases, current_slave pointer is changed and 0 is returned. + */ +static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *old_active = NULL; + struct slave *new_active = NULL; + int res = 0; + + if (!USES_PRIMARY(bond->params.mode)) + return -EINVAL; + + /* Verify that master_dev is indeed the master of slave_dev */ + if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) + return -EINVAL; + + read_lock(&bond->lock); + + read_lock(&bond->curr_slave_lock); + old_active = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + new_active = bond_get_slave_by_dev(bond, slave_dev); + + /* + * Changing to the current active: do nothing; return success. + */ + if (new_active && (new_active == old_active)) { + read_unlock(&bond->lock); + return 0; + } + + if ((new_active) && + (old_active) && + (new_active->link == BOND_LINK_UP) && + IS_UP(new_active->dev)) { + block_netpoll_tx(); + write_lock_bh(&bond->curr_slave_lock); + bond_change_active_slave(bond, new_active); + write_unlock_bh(&bond->curr_slave_lock); + unblock_netpoll_tx(); + } else + res = -EINVAL; + + read_unlock(&bond->lock); + + return res; +} + +static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) +{ + struct bonding *bond = netdev_priv(bond_dev); + + info->bond_mode = bond->params.mode; + info->miimon = bond->params.miimon; + + read_lock(&bond->lock); + info->num_slaves = bond->slave_cnt; + read_unlock(&bond->lock); + + return 0; +} + +static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + int i, res = -ENODEV; + + read_lock(&bond->lock); + + bond_for_each_slave(bond, slave, i) { + if (i == (int)info->slave_id) { + res = 0; + strcpy(info->slave_name, slave->dev->name); + info->link = slave->link; + info->state = bond_slave_state(slave); + info->link_failure_count = slave->link_failure_count; + break; + } + } + + read_unlock(&bond->lock); + + return res; +} + +/*-------------------------------- Monitoring -------------------------------*/ + + +static int bond_miimon_inspect(struct bonding *bond) +{ + struct slave *slave; + int i, link_state, commit = 0; + bool ignore_updelay; + + ignore_updelay = !bond->curr_active_slave ? true : false; + + bond_for_each_slave(bond, slave, i) { + slave->new_link = BOND_LINK_NOCHANGE; + + link_state = bond_check_dev_link(bond, slave->dev, 0); + + switch (slave->link) { + case BOND_LINK_UP: + if (link_state) + continue; + + slave->link = BOND_LINK_FAIL; + slave->delay = bond->params.downdelay; + if (slave->delay) { + pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", + bond->dev->name, + (bond->params.mode == + BOND_MODE_ACTIVEBACKUP) ? + (bond_is_active_slave(slave) ? + "active " : "backup ") : "", + slave->dev->name, + bond->params.downdelay * bond->params.miimon); + } + /*FALLTHRU*/ + case BOND_LINK_FAIL: + if (link_state) { + /* + * recovered before downdelay expired + */ + slave->link = BOND_LINK_UP; + slave->jiffies = jiffies; + pr_info("%s: link status up again after %d ms for interface %s.\n", + bond->dev->name, + (bond->params.downdelay - slave->delay) * + bond->params.miimon, + slave->dev->name); + continue; + } + + if (slave->delay <= 0) { + slave->new_link = BOND_LINK_DOWN; + commit++; + continue; + } + + slave->delay--; + break; + + case BOND_LINK_DOWN: + if (!link_state) + continue; + + slave->link = BOND_LINK_BACK; + slave->delay = bond->params.updelay; + + if (slave->delay) { + pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", + bond->dev->name, slave->dev->name, + ignore_updelay ? 0 : + bond->params.updelay * + bond->params.miimon); + } + /*FALLTHRU*/ + case BOND_LINK_BACK: + if (!link_state) { + slave->link = BOND_LINK_DOWN; + pr_info("%s: link status down again after %d ms for interface %s.\n", + bond->dev->name, + (bond->params.updelay - slave->delay) * + bond->params.miimon, + slave->dev->name); + + continue; + } + + if (ignore_updelay) + slave->delay = 0; + + if (slave->delay <= 0) { + slave->new_link = BOND_LINK_UP; + commit++; + ignore_updelay = false; + continue; + } + + slave->delay--; + break; + } + } + + return commit; +} + +static void bond_miimon_commit(struct bonding *bond) +{ + struct slave *slave; + int i; + + bond_for_each_slave(bond, slave, i) { + switch (slave->new_link) { + case BOND_LINK_NOCHANGE: + continue; + + case BOND_LINK_UP: + slave->link = BOND_LINK_UP; + slave->jiffies = jiffies; + + if (bond->params.mode == BOND_MODE_8023AD) { + /* prevent it from being the active one */ + bond_set_backup_slave(slave); + } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { + /* make it immediately active */ + bond_set_active_slave(slave); + } else if (slave != bond->primary_slave) { + /* prevent it from being the active one */ + bond_set_backup_slave(slave); + } + + bond_update_speed_duplex(slave); + + pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", + bond->dev->name, slave->dev->name, + slave->speed, slave->duplex ? "full" : "half"); + + /* notify ad that the link status has changed */ + if (bond->params.mode == BOND_MODE_8023AD) + bond_3ad_handle_link_change(slave, BOND_LINK_UP); + + if (bond_is_lb(bond)) + bond_alb_handle_link_change(bond, slave, + BOND_LINK_UP); + + if (!bond->curr_active_slave || + (slave == bond->primary_slave)) + goto do_failover; + + continue; + + case BOND_LINK_DOWN: + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + slave->link = BOND_LINK_DOWN; + + if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || + bond->params.mode == BOND_MODE_8023AD) + bond_set_slave_inactive_flags(slave); + + pr_info("%s: link status definitely down for interface %s, disabling it\n", + bond->dev->name, slave->dev->name); + + if (bond->params.mode == BOND_MODE_8023AD) + bond_3ad_handle_link_change(slave, + BOND_LINK_DOWN); + + if (bond_is_lb(bond)) + bond_alb_handle_link_change(bond, slave, + BOND_LINK_DOWN); + + if (slave == bond->curr_active_slave) + goto do_failover; + + continue; + + default: + pr_err("%s: invalid new link %d on slave %s\n", + bond->dev->name, slave->new_link, + slave->dev->name); + slave->new_link = BOND_LINK_NOCHANGE; + + continue; + } + +do_failover: + ASSERT_RTNL(); + block_netpoll_tx(); + write_lock_bh(&bond->curr_slave_lock); + bond_select_active_slave(bond); + write_unlock_bh(&bond->curr_slave_lock); + unblock_netpoll_tx(); + } + + bond_set_carrier(bond); +} + +/* + * bond_mii_monitor + * + * Really a wrapper that splits the mii monitor into two phases: an + * inspection, then (if inspection indicates something needs to be done) + * an acquisition of appropriate locks followed by a commit phase to + * implement whatever link state changes are indicated. + */ +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; + + read_lock(&bond->lock); + + delay = msecs_to_jiffies(bond->params.miimon); + + if (bond->slave_cnt == 0) + goto re_arm; + + should_notify_peers = bond_should_notify_peers(bond); + + if (bond_miimon_inspect(bond)) { + read_unlock(&bond->lock); + + /* Race avoidance with bond_close cancel of workqueue */ + if (!rtnl_trylock()) { + read_lock(&bond->lock); + delay = 1; + should_notify_peers = false; + goto re_arm; + } + + read_lock(&bond->lock); + + bond_miimon_commit(bond); + + read_unlock(&bond->lock); + rtnl_unlock(); /* might sleep, hold no other locks */ + read_lock(&bond->lock); + } + +re_arm: + if (bond->params.miimon) + queue_delayed_work(bond->wq, &bond->mii_work, delay); + + read_unlock(&bond->lock); + + if (should_notify_peers) { + if (!rtnl_trylock()) { + read_lock(&bond->lock); + bond->send_peer_notif++; + read_unlock(&bond->lock); + return; + } + netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); + rtnl_unlock(); + } +} + +static int bond_has_this_ip(struct bonding *bond, __be32 ip) +{ + struct vlan_entry *vlan; + struct net_device *vlan_dev; + + if (ip == bond_confirm_addr(bond->dev, 0, ip)) + return 1; + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + rcu_read_lock(); + vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id); + rcu_read_unlock(); + if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip)) + return 1; + } + + return 0; +} + +/* + * We go to the (large) trouble of VLAN tagging ARP frames because + * switches in VLAN mode (especially if ports are configured as + * "native" to a VLAN) might not pass non-tagged frames. + */ +static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) +{ + struct sk_buff *skb; + + pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, + slave_dev->name, dest_ip, src_ip, vlan_id); + + skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, + NULL, slave_dev->dev_addr, NULL); + + if (!skb) { + pr_err("ARP packet allocation failed\n"); + return; + } + if (vlan_id) { + skb = vlan_put_tag(skb, vlan_id); + if (!skb) { + pr_err("failed to insert VLAN tag\n"); + return; + } + } + arp_xmit(skb); +} + + +static void bond_arp_send_all(struct bonding *bond, struct slave *slave) +{ + int i, vlan_id; + __be32 *targets = bond->params.arp_targets; + struct vlan_entry *vlan; + struct net_device *vlan_dev = NULL; + struct rtable *rt; + + for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { + __be32 addr; + if (!targets[i]) + break; + pr_debug("basa: target %x\n", targets[i]); + if (!bond_vlan_used(bond)) { + pr_debug("basa: empty vlan: arp_send\n"); + addr = bond_confirm_addr(bond->dev, targets[i], 0); + bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], + addr, 0); + continue; + } + + /* + * If VLANs are configured, we do a route lookup to + * determine which VLAN interface would be used, so we + * can tag the ARP with the proper VLAN tag. + */ + rt = ip_route_output(dev_net(bond->dev), targets[i], 0, + RTO_ONLINK, 0); + if (IS_ERR(rt)) { + if (net_ratelimit()) { + pr_warning("%s: no route to arp_ip_target %pI4\n", + bond->dev->name, &targets[i]); + } + continue; + } + + /* + * This target is not on a VLAN + */ + if (rt->dst.dev == bond->dev) { + ip_rt_put(rt); + pr_debug("basa: rtdev == bond->dev: arp_send\n"); + addr = bond_confirm_addr(bond->dev, targets[i], 0); + bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], + addr, 0); + continue; + } + + vlan_id = 0; + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + rcu_read_lock(); + vlan_dev = __vlan_find_dev_deep(bond->dev, + vlan->vlan_id); + rcu_read_unlock(); + if (vlan_dev == rt->dst.dev) { + vlan_id = vlan->vlan_id; + pr_debug("basa: vlan match on %s %d\n", + vlan_dev->name, vlan_id); + break; + } + } + + if (vlan_id && vlan_dev) { + ip_rt_put(rt); + addr = bond_confirm_addr(vlan_dev, targets[i], 0); + bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], + addr, vlan_id); + continue; + } + + if (net_ratelimit()) { + pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", + bond->dev->name, &targets[i], + rt->dst.dev ? rt->dst.dev->name : "NULL"); + } + ip_rt_put(rt); + } +} + +static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) +{ + int i; + __be32 *targets = bond->params.arp_targets; + + for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { + pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", + &sip, &tip, i, &targets[i], + bond_has_this_ip(bond, tip)); + if (sip == targets[i]) { + if (bond_has_this_ip(bond, tip)) + slave->last_arp_rx = jiffies; + return; + } + } +} + +static int bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct arphdr *arp; + unsigned char *arp_ptr; + __be32 sip, tip; + + if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) + return RX_HANDLER_ANOTHER; + + read_lock(&bond->lock); + + pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", + bond->dev->name, skb->dev->name); + + if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) + goto out_unlock; + + arp = arp_hdr(skb); + if (arp->ar_hln != bond->dev->addr_len || + skb->pkt_type == PACKET_OTHERHOST || + skb->pkt_type == PACKET_LOOPBACK || + arp->ar_hrd != htons(ARPHRD_ETHER) || + arp->ar_pro != htons(ETH_P_IP) || + arp->ar_pln != 4) + goto out_unlock; + + arp_ptr = (unsigned char *)(arp + 1); + arp_ptr += bond->dev->addr_len; + memcpy(&sip, arp_ptr, 4); + arp_ptr += 4 + bond->dev->addr_len; + memcpy(&tip, arp_ptr, 4); + + pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", + bond->dev->name, slave->dev->name, bond_slave_state(slave), + bond->params.arp_validate, slave_do_arp_validate(bond, slave), + &sip, &tip); + + /* + * Backup slaves won't see the ARP reply, but do come through + * here for each ARP probe (so we swap the sip/tip to validate + * the probe). In a "redundant switch, common router" type of + * configuration, the ARP probe will (hopefully) travel from + * the active, through one switch, the router, then the other + * switch before reaching the backup. + */ + if (bond_is_active_slave(slave)) + bond_validate_arp(bond, slave, sip, tip); + else + bond_validate_arp(bond, slave, tip, sip); + +out_unlock: + read_unlock(&bond->lock); + return RX_HANDLER_ANOTHER; +} + +/* + * this function is called regularly to monitor each slave's link + * ensuring that traffic is being sent and received when arp monitoring + * is used in load-balancing mode. if the adapter has been dormant, then an + * arp is transmitted to generate traffic. see activebackup_arp_monitor for + * arp monitoring in active backup mode. + */ +void bond_loadbalance_arp_mon(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + arp_work.work); + struct slave *slave, *oldcurrent; + int do_failover = 0; + int delta_in_ticks; + int i; + + read_lock(&bond->lock); + + delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); + + if (bond->slave_cnt == 0) + goto re_arm; + + read_lock(&bond->curr_slave_lock); + oldcurrent = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + /* see if any of the previous devices are up now (i.e. they have + * xmt and rcv traffic). the curr_active_slave does not come into + * the picture unless it is null. also, slave->jiffies is not needed + * here because we send an arp on each slave and give a slave as + * long as it needs to get the tx/rx within the delta. + * TODO: what about up/down delay in arp mode? it wasn't here before + * so it can wait + */ + bond_for_each_slave(bond, slave, i) { + unsigned long trans_start = dev_trans_start(slave->dev); + + if (slave->link != BOND_LINK_UP) { + if (time_in_range(jiffies, + trans_start - delta_in_ticks, + trans_start + delta_in_ticks) && + time_in_range(jiffies, + slave->dev->last_rx - delta_in_ticks, + slave->dev->last_rx + delta_in_ticks)) { + + slave->link = BOND_LINK_UP; + bond_set_active_slave(slave); + + /* primary_slave has no meaning in round-robin + * mode. the window of a slave being up and + * curr_active_slave being null after enslaving + * is closed. + */ + if (!oldcurrent) { + pr_info("%s: link status definitely up for interface %s, ", + bond->dev->name, + slave->dev->name); + do_failover = 1; + } else { + pr_info("%s: interface %s is now up\n", + bond->dev->name, + slave->dev->name); + } + } + } else { + /* slave->link == BOND_LINK_UP */ + + /* not all switches will respond to an arp request + * when the source ip is 0, so don't take the link down + * if we don't know our ip yet + */ + if (!time_in_range(jiffies, + trans_start - delta_in_ticks, + trans_start + 2 * delta_in_ticks) || + !time_in_range(jiffies, + slave->dev->last_rx - delta_in_ticks, + slave->dev->last_rx + 2 * delta_in_ticks)) { + + slave->link = BOND_LINK_DOWN; + bond_set_backup_slave(slave); + + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + pr_info("%s: interface %s is now down.\n", + bond->dev->name, + slave->dev->name); + + if (slave == oldcurrent) + do_failover = 1; + } + } + + /* note: if switch is in round-robin mode, all links + * must tx arp to ensure all links rx an arp - otherwise + * links may oscillate or not come up at all; if switch is + * in something like xor mode, there is nothing we can + * do - all replies will be rx'ed on same link causing slaves + * to be unstable during low/no traffic periods + */ + if (IS_UP(slave->dev)) + bond_arp_send_all(bond, slave); + } + + if (do_failover) { + block_netpoll_tx(); + write_lock_bh(&bond->curr_slave_lock); + + bond_select_active_slave(bond); + + write_unlock_bh(&bond->curr_slave_lock); + unblock_netpoll_tx(); + } + +re_arm: + if (bond->params.arp_interval) + queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); + + read_unlock(&bond->lock); +} + +/* + * 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 bond->lock held for read. + */ +static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) +{ + struct slave *slave; + int i, commit = 0; + unsigned long trans_start; + + bond_for_each_slave(bond, slave, i) { + slave->new_link = BOND_LINK_NOCHANGE; + + if (slave->link != BOND_LINK_UP) { + if (time_in_range(jiffies, + slave_last_rx(bond, slave) - delta_in_ticks, + slave_last_rx(bond, slave) + delta_in_ticks)) { + + 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 (time_in_range(jiffies, + slave->jiffies - delta_in_ticks, + slave->jiffies + 2 * delta_in_ticks)) + continue; + + /* + * Backup slave is down if: + * - No current_arp_slave AND + * - more than 3*delta since last receive AND + * - the bond has an IP address + * + * Note: a non-null current_arp_slave indicates + * the curr_active_slave went down and we are + * searching for a new one; under this condition + * we only take the curr_active_slave down - this + * gives each slave a chance to tx/rx traffic + * before being taken out + */ + if (!bond_is_active_slave(slave) && + !bond->current_arp_slave && + !time_in_range(jiffies, + slave_last_rx(bond, slave) - delta_in_ticks, + slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { + + 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) && + (!time_in_range(jiffies, + trans_start - delta_in_ticks, + trans_start + 2 * delta_in_ticks) || + !time_in_range(jiffies, + slave_last_rx(bond, slave) - delta_in_ticks, + slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { + + 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 and bond->lock for read. + */ +static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) +{ + struct slave *slave; + int i; + unsigned long trans_start; + + bond_for_each_slave(bond, slave, i) { + switch (slave->new_link) { + case BOND_LINK_NOCHANGE: + continue; + + case BOND_LINK_UP: + trans_start = dev_trans_start(slave->dev); + if ((!bond->curr_active_slave && + time_in_range(jiffies, + trans_start - delta_in_ticks, + trans_start + delta_in_ticks)) || + bond->curr_active_slave != slave) { + slave->link = BOND_LINK_UP; + if (bond->current_arp_slave) { + bond_set_slave_inactive_flags( + bond->current_arp_slave); + bond->current_arp_slave = NULL; + } + + pr_info("%s: link status definitely up for interface %s.\n", + bond->dev->name, slave->dev->name); + + if (!bond->curr_active_slave || + (slave == bond->primary_slave)) + goto do_failover; + + } + + continue; + + case BOND_LINK_DOWN: + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + slave->link = BOND_LINK_DOWN; + bond_set_slave_inactive_flags(slave); + + pr_info("%s: link status definitely down for interface %s, disabling it\n", + bond->dev->name, slave->dev->name); + + if (slave == bond->curr_active_slave) { + bond->current_arp_slave = NULL; + goto do_failover; + } + + continue; + + default: + pr_err("%s: impossible: new_link %d on slave %s\n", + bond->dev->name, slave->new_link, + slave->dev->name); + continue; + } + +do_failover: + ASSERT_RTNL(); + block_netpoll_tx(); + write_lock_bh(&bond->curr_slave_lock); + bond_select_active_slave(bond); + write_unlock_bh(&bond->curr_slave_lock); + unblock_netpoll_tx(); + } + + bond_set_carrier(bond); +} + +/* + * Send ARP probes for active-backup mode ARP monitor. + * + * Called with bond->lock held for read. + */ +static void bond_ab_arp_probe(struct bonding *bond) +{ + struct slave *slave; + int i; + + read_lock(&bond->curr_slave_lock); + + if (bond->current_arp_slave && bond->curr_active_slave) + pr_info("PROBE: c_arp %s && cas %s BAD\n", + bond->current_arp_slave->dev->name, + bond->curr_active_slave->dev->name); + + if (bond->curr_active_slave) { + bond_arp_send_all(bond, bond->curr_active_slave); + read_unlock(&bond->curr_slave_lock); + return; + } + + read_unlock(&bond->curr_slave_lock); + + /* 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 (!bond->current_arp_slave) { + bond->current_arp_slave = bond->first_slave; + if (!bond->current_arp_slave) + return; + } + + bond_set_slave_inactive_flags(bond->current_arp_slave); + + /* search for next candidate */ + bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { + if (IS_UP(slave->dev)) { + slave->link = BOND_LINK_BACK; + bond_set_slave_active_flags(slave); + bond_arp_send_all(bond, slave); + slave->jiffies = jiffies; + bond->current_arp_slave = slave; + break; + } + + /* if the link state is up at this point, we + * mark it down - this can happen if we have + * simultaneous link failures and + * reselect_active_interface doesn't make this + * one the current slave so it is still marked + * up when it is actually down + */ + if (slave->link == BOND_LINK_UP) { + slave->link = BOND_LINK_DOWN; + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + bond_set_slave_inactive_flags(slave); + + pr_info("%s: backup interface %s is now down.\n", + bond->dev->name, slave->dev->name); + } + } +} + +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; + int delta_in_ticks; + + read_lock(&bond->lock); + + delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); + + if (bond->slave_cnt == 0) + goto re_arm; + + should_notify_peers = bond_should_notify_peers(bond); + + if (bond_ab_arp_inspect(bond, delta_in_ticks)) { + read_unlock(&bond->lock); + + /* Race avoidance with bond_close flush of workqueue */ + if (!rtnl_trylock()) { + read_lock(&bond->lock); + delta_in_ticks = 1; + should_notify_peers = false; + goto re_arm; + } + + read_lock(&bond->lock); + + bond_ab_arp_commit(bond, delta_in_ticks); + + read_unlock(&bond->lock); + rtnl_unlock(); + read_lock(&bond->lock); + } + + bond_ab_arp_probe(bond); + +re_arm: + if (bond->params.arp_interval) + queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); + + read_unlock(&bond->lock); + + if (should_notify_peers) { + if (!rtnl_trylock()) { + read_lock(&bond->lock); + bond->send_peer_notif++; + read_unlock(&bond->lock); + return; + } + netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); + 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); + default: + break; + } + + return NOTIFY_DONE; +} + +static int bond_slave_netdev_event(unsigned long event, + struct net_device *slave_dev) +{ + struct net_device *bond_dev = slave_dev->master; + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave = NULL; + + switch (event) { + case NETDEV_UNREGISTER: + if (bond_dev) { + if (bond->setup_by_slave) + bond_release_and_destroy(bond_dev, slave_dev); + else + bond_release(bond_dev, slave_dev); + } + break; + case NETDEV_UP: + case NETDEV_CHANGE: + slave = bond_get_slave_by_dev(bond, slave_dev); + if (slave) { + u32 old_speed = slave->speed; + u8 old_duplex = slave->duplex; + + bond_update_speed_duplex(slave); + + if (bond->params.mode == BOND_MODE_8023AD) { + if (old_speed != slave->speed) + bond_3ad_adapter_speed_changed(slave); + if (old_duplex != slave->duplex) + bond_3ad_adapter_duplex_changed(slave); + } + } + + break; + case NETDEV_DOWN: + /* + * ... Or is it this? + */ + break; + case NETDEV_CHANGEMTU: + /* + * TODO: Should slaves be allowed to + * independently alter their MTU? For + * an active-backup bond, slaves need + * not be the same type of device, so + * MTUs may vary. For other modes, + * slaves arguably should have the + * same MTUs. To do this, we'd need to + * take over the slave's change_mtu + * function for the duration of their + * servitude. + */ + break; + case NETDEV_CHANGENAME: + /* + * TODO: handle changing the primary's name + */ + break; + case NETDEV_FEAT_CHANGE: + bond_compute_features(bond); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +/* + * bond_netdev_event: handle netdev notifier chain events. + * + * This function receives events for the netdev chain. The caller (an + * ioctl handler calling blocking_notifier_call_chain) holds the necessary + * locks for us to safely manipulate the slave devices (RTNL lock, + * dev_probe_lock). + */ +static int bond_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *event_dev = (struct net_device *)ptr; + + pr_debug("event_dev: %s, event: %lx\n", + event_dev ? event_dev->name : "None", + event); + + if (!(event_dev->priv_flags & IFF_BONDING)) + return NOTIFY_DONE; + + if (event_dev->flags & IFF_MASTER) { + pr_debug("IFF_MASTER\n"); + return bond_master_netdev_event(event, event_dev); + } + + if (event_dev->flags & IFF_SLAVE) { + pr_debug("IFF_SLAVE\n"); + return bond_slave_netdev_event(event, event_dev); + } + + return NOTIFY_DONE; +} + +static struct notifier_block bond_netdev_notifier = { + .notifier_call = bond_netdev_event, +}; + +/*---------------------------- Hashing Policies -----------------------------*/ + +/* + * Hash for the output device based upon layer 2 and layer 3 data. If + * the packet is not IP mimic bond_xmit_hash_policy_l2() + */ +static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) +{ + struct ethhdr *data = (struct ethhdr *)skb->data; + struct iphdr *iph = ip_hdr(skb); + + if (skb->protocol == htons(ETH_P_IP)) { + return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ + (data->h_dest[5] ^ data->h_source[5])) % count; + } + + return (data->h_dest[5] ^ data->h_source[5]) % count; +} + +/* + * Hash for the output device based upon layer 3 and layer 4 data. If + * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is + * altogether not IP, mimic bond_xmit_hash_policy_l2() + */ +static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) +{ + struct ethhdr *data = (struct ethhdr *)skb->data; + struct iphdr *iph = ip_hdr(skb); + __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); + int layer4_xor = 0; + + if (skb->protocol == htons(ETH_P_IP)) { + if (!ip_is_fragment(iph) && + (iph->protocol == IPPROTO_TCP || + iph->protocol == IPPROTO_UDP)) { + layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); + } + return (layer4_xor ^ + ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; + + } + + return (data->h_dest[5] ^ data->h_source[5]) % count; +} + +/* + * Hash for the output device based upon layer 2 data + */ +static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) +{ + struct ethhdr *data = (struct ethhdr *)skb->data; + + return (data->h_dest[5] ^ data->h_source[5]) % count; +} + +/*-------------------------- Device entry points ----------------------------*/ + +static int bond_open(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + int i; + + /* reset slave->backup and slave->inactive */ + read_lock(&bond->lock); + if (bond->slave_cnt > 0) { + read_lock(&bond->curr_slave_lock); + bond_for_each_slave(bond, slave, i) { + if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) + && (slave != bond->curr_active_slave)) { + bond_set_slave_inactive_flags(slave); + } else { + bond_set_slave_active_flags(slave); + } + } + read_unlock(&bond->curr_slave_lock); + } + read_unlock(&bond->lock); + + INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); + + if (bond_is_lb(bond)) { + /* bond_alb_initialize must be called before the timer + * is started. + */ + if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { + /* something went wrong - fail the open operation */ + return -ENOMEM; + } + + INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); + queue_delayed_work(bond->wq, &bond->alb_work, 0); + } + + if (bond->params.miimon) { /* link check interval, in milliseconds. */ + INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); + queue_delayed_work(bond->wq, &bond->mii_work, 0); + } + + if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ + if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) + INIT_DELAYED_WORK(&bond->arp_work, + bond_activebackup_arp_mon); + else + INIT_DELAYED_WORK(&bond->arp_work, + bond_loadbalance_arp_mon); + + queue_delayed_work(bond->wq, &bond->arp_work, 0); + if (bond->params.arp_validate) + bond->recv_probe = bond_arp_rcv; + } + + if (bond->params.mode == BOND_MODE_8023AD) { + INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); + queue_delayed_work(bond->wq, &bond->ad_work, 0); + /* register to receive LACPDUs */ + bond->recv_probe = bond_3ad_lacpdu_recv; + bond_3ad_initiate_agg_selection(bond, 1); + } + + return 0; +} + +static int bond_close(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + + write_lock_bh(&bond->lock); + + bond->send_peer_notif = 0; + + write_unlock_bh(&bond->lock); + + if (bond->params.miimon) { /* link check interval, in milliseconds. */ + cancel_delayed_work_sync(&bond->mii_work); + } + + if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ + cancel_delayed_work_sync(&bond->arp_work); + } + + switch (bond->params.mode) { + case BOND_MODE_8023AD: + cancel_delayed_work_sync(&bond->ad_work); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + cancel_delayed_work_sync(&bond->alb_work); + break; + default: + break; + } + + if (delayed_work_pending(&bond->mcast_work)) + cancel_delayed_work_sync(&bond->mcast_work); + + if (bond_is_lb(bond)) { + /* Must be called only after all + * slaves have been released + */ + 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 slave *slave; + int i; + + memset(stats, 0, sizeof(*stats)); + + read_lock_bh(&bond->lock); + + bond_for_each_slave(bond, slave, i) { + const struct rtnl_link_stats64 *sstats = + dev_get_stats(slave->dev, &temp); + + stats->rx_packets += sstats->rx_packets; + stats->rx_bytes += sstats->rx_bytes; + stats->rx_errors += sstats->rx_errors; + stats->rx_dropped += sstats->rx_dropped; + + stats->tx_packets += sstats->tx_packets; + stats->tx_bytes += sstats->tx_bytes; + stats->tx_errors += sstats->tx_errors; + stats->tx_dropped += sstats->tx_dropped; + + stats->multicast += sstats->multicast; + stats->collisions += sstats->collisions; + + stats->rx_length_errors += sstats->rx_length_errors; + stats->rx_over_errors += sstats->rx_over_errors; + stats->rx_crc_errors += sstats->rx_crc_errors; + stats->rx_frame_errors += sstats->rx_frame_errors; + stats->rx_fifo_errors += sstats->rx_fifo_errors; + stats->rx_missed_errors += sstats->rx_missed_errors; + + stats->tx_aborted_errors += sstats->tx_aborted_errors; + stats->tx_carrier_errors += sstats->tx_carrier_errors; + stats->tx_fifo_errors += sstats->tx_fifo_errors; + stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; + stats->tx_window_errors += sstats->tx_window_errors; + } + + read_unlock_bh(&bond->lock); + + return stats; +} + +static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) +{ + struct net_device *slave_dev = NULL; + struct ifbond k_binfo; + struct ifbond __user *u_binfo = NULL; + struct ifslave k_sinfo; + struct ifslave __user *u_sinfo = NULL; + struct mii_ioctl_data *mii = NULL; + int res = 0; + + pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); + + switch (cmd) { + case SIOCGMIIPHY: + mii = if_mii(ifr); + if (!mii) + return -EINVAL; + + mii->phy_id = 0; + /* Fall Through */ + case SIOCGMIIREG: + /* + * We do this again just in case we were called by SIOCGMIIREG + * instead of SIOCGMIIPHY. + */ + mii = if_mii(ifr); + if (!mii) + return -EINVAL; + + + if (mii->reg_num == 1) { + struct bonding *bond = netdev_priv(bond_dev); + mii->val_out = 0; + read_lock(&bond->lock); + read_lock(&bond->curr_slave_lock); + if (netif_carrier_ok(bond->dev)) + mii->val_out = BMSR_LSTATUS; + + read_unlock(&bond->curr_slave_lock); + read_unlock(&bond->lock); + } + + return 0; + case BOND_INFO_QUERY_OLD: + case SIOCBONDINFOQUERY: + u_binfo = (struct ifbond __user *)ifr->ifr_data; + + if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) + return -EFAULT; + + res = bond_info_query(bond_dev, &k_binfo); + if (res == 0 && + copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) + return -EFAULT; + + return res; + case BOND_SLAVE_INFO_QUERY_OLD: + case SIOCBONDSLAVEINFOQUERY: + u_sinfo = (struct ifslave __user *)ifr->ifr_data; + + if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) + return -EFAULT; + + res = bond_slave_info_query(bond_dev, &k_sinfo); + if (res == 0 && + copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) + return -EFAULT; + + return res; + default: + /* Go on */ + break; + } + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); + + pr_debug("slave_dev=%p:\n", slave_dev); + + if (!slave_dev) + res = -ENODEV; + else { + pr_debug("slave_dev->name=%s:\n", slave_dev->name); + switch (cmd) { + case BOND_ENSLAVE_OLD: + case SIOCBONDENSLAVE: + res = bond_enslave(bond_dev, slave_dev); + break; + case BOND_RELEASE_OLD: + case SIOCBONDRELEASE: + res = bond_release(bond_dev, slave_dev); + break; + case BOND_SETHWADDR_OLD: + case SIOCBONDSETHWADDR: + res = bond_sethwaddr(bond_dev, slave_dev); + break; + case BOND_CHANGE_ACTIVE_OLD: + case SIOCBONDCHANGEACTIVE: + res = bond_ioctl_change_active(bond_dev, slave_dev); + break; + default: + res = -EOPNOTSUPP; + } + + dev_put(slave_dev); + } + + return res; +} + +static bool bond_addr_in_mc_list(unsigned char *addr, + struct netdev_hw_addr_list *list, + int addrlen) +{ + struct netdev_hw_addr *ha; + + netdev_hw_addr_list_for_each(ha, list) + if (!memcmp(ha->addr, addr, addrlen)) + return true; + + return false; +} + +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_multicast_list(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct netdev_hw_addr *ha; + bool found; + + read_lock(&bond->lock); + + /* looking for addresses to add to slaves' mc list */ + netdev_for_each_mc_addr(ha, bond_dev) { + found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, + bond_dev->addr_len); + if (!found) + bond_mc_add(bond, ha->addr); + } + + /* looking for addresses to delete from slaves' list */ + netdev_hw_addr_list_for_each(ha, &bond->mc_list) { + found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, + bond_dev->addr_len); + if (!found) + bond_mc_del(bond, ha->addr); + } + + /* save master's multicast list */ + __hw_addr_flush(&bond->mc_list); + __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, + bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); + + read_unlock(&bond->lock); +} + +static int bond_neigh_init(struct neighbour *n) +{ + struct bonding *bond = netdev_priv(n->dev); + struct slave *slave = bond->first_slave; + const struct net_device_ops *slave_ops; + struct neigh_parms parms; + int ret; + + 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. + */ +static int bond_neigh_setup(struct net_device *dev, + struct neigh_parms *parms) +{ + 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, *stop_at; + int res = 0; + int i; + + pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, + (bond_dev ? bond_dev->name : "None"), new_mtu); + + /* Can't hold bond->lock with bh disabled here since + * some base drivers panic. On the other hand we can't + * hold bond->lock without bh disabled because we'll + * deadlock. The only solution is to rely on the fact + * that we're under rtnl_lock here, and the slaves + * list won't change. This doesn't solve the problem + * of setting the slave's MTU while it is + * transmitting, but the assumption is that the base + * driver can handle that. + * + * TODO: figure out a way to safely iterate the slaves + * list, but without holding a lock around the actual + * call to the base driver. + */ + + bond_for_each_slave(bond, slave, i) { + pr_debug("s %p s->p %p c_m %p\n", + slave, + slave->prev, + slave->dev->netdev_ops->ndo_change_mtu); + + res = dev_set_mtu(slave->dev, new_mtu); + + if (res) { + /* If we failed to set the slave's mtu to the new value + * we must abort the operation even in ACTIVE_BACKUP + * mode, because if we allow the backup slaves to have + * different mtu values than the active slave we'll + * need to change their mtu when doing a failover. That + * means changing their mtu from timer context, which + * is probably not a good idea. + */ + pr_debug("err %d %s\n", res, slave->dev->name); + goto unwind; + } + } + + bond_dev->mtu = new_mtu; + + return 0; + +unwind: + /* unwind from head to the slave that failed */ + stop_at = slave; + bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { + int tmp_res; + + tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); + if (tmp_res) { + pr_debug("unwind err %d dev %s\n", + tmp_res, slave->dev->name); + } + } + + return res; +} + +/* + * Change HW address + * + * Note that many devices must be down to change the HW address, and + * downing the master releases all slaves. We can make bonds full of + * bonding devices to test this, however. + */ +static int bond_set_mac_address(struct net_device *bond_dev, void *addr) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct sockaddr *sa = addr, tmp_sa; + struct slave *slave, *stop_at; + int res = 0; + int i; + + if (bond->params.mode == BOND_MODE_ALB) + return bond_alb_set_mac_address(bond_dev, addr); + + + pr_debug("bond=%p, name=%s\n", + bond, bond_dev ? bond_dev->name : "None"); + + /* + * If fail_over_mac is set to active, do nothing and return + * success. Returning an error causes ifenslave to fail. + */ + if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) + return 0; + + if (!is_valid_ether_addr(sa->sa_data)) + return -EADDRNOTAVAIL; + + /* Can't hold bond->lock with bh disabled here since + * some base drivers panic. On the other hand we can't + * hold bond->lock without bh disabled because we'll + * deadlock. The only solution is to rely on the fact + * that we're under rtnl_lock here, and the slaves + * list won't change. This doesn't solve the problem + * of setting the slave's hw address while it is + * transmitting, but the assumption is that the base + * driver can handle that. + * + * TODO: figure out a way to safely iterate the slaves + * list, but without holding a lock around the actual + * call to the base driver. + */ + + bond_for_each_slave(bond, slave, i) { + const struct net_device_ops *slave_ops = slave->dev->netdev_ops; + pr_debug("slave %p %s\n", slave, slave->dev->name); + + if (slave_ops->ndo_set_mac_address == NULL) { + res = -EOPNOTSUPP; + pr_debug("EOPNOTSUPP %s\n", slave->dev->name); + goto unwind; + } + + res = dev_set_mac_address(slave->dev, addr); + if (res) { + /* TODO: consider downing the slave + * and retry ? + * User should expect communications + * breakage anyway until ARP finish + * updating, so... + */ + pr_debug("err %d %s\n", res, slave->dev->name); + goto unwind; + } + } + + /* success */ + memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); + return 0; + +unwind: + memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); + tmp_sa.sa_family = bond_dev->type; + + /* unwind from head to the slave that failed */ + stop_at = slave; + bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { + int tmp_res; + + tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); + if (tmp_res) { + pr_debug("unwind err %d dev %s\n", + tmp_res, slave->dev->name); + } + } + + return res; +} + +static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *start_at; + int i, slave_no, res = 1; + struct iphdr *iph = ip_hdr(skb); + + /* + * 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))) { + + read_lock(&bond->curr_slave_lock); + slave = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + if (!slave) + goto out; + } else { + /* + * Concurrent TX may collide on rr_tx_counter; we accept + * that as being rare enough not to justify using an + * atomic op here. + */ + slave_no = bond->rr_tx_counter++ % bond->slave_cnt; + + bond_for_each_slave(bond, slave, i) { + slave_no--; + if (slave_no < 0) + break; + } + } + + start_at = slave; + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + bond_is_active_slave(slave)) { + res = bond_dev_queue_xmit(bond, skb, slave->dev); + break; + } + } + +out: + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(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); + int res = 1; + + read_lock(&bond->curr_slave_lock); + + if (bond->curr_active_slave) + res = bond_dev_queue_xmit(bond, skb, + bond->curr_active_slave->dev); + + if (res) + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + + read_unlock(&bond->curr_slave_lock); + + return NETDEV_TX_OK; +} + +/* + * In bond_xmit_xor() , we determine the output device by using a pre- + * determined xmit_hash_policy(), If the selected device is not enabled, + * find the next active slave. + */ +static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *start_at; + int slave_no; + int i; + int res = 1; + + slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); + + bond_for_each_slave(bond, slave, i) { + slave_no--; + if (slave_no < 0) + break; + } + + start_at = slave; + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + bond_is_active_slave(slave)) { + res = bond_dev_queue_xmit(bond, skb, slave->dev); + break; + } + } + + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(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, *start_at; + struct net_device *tx_dev = NULL; + int i; + int res = 1; + + read_lock(&bond->curr_slave_lock); + start_at = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + if (!start_at) + goto out; + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + bond_is_active_slave(slave)) { + if (tx_dev) { + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); + if (!skb2) { + pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", + bond_dev->name); + continue; + } + + res = bond_dev_queue_xmit(bond, skb2, tx_dev); + if (res) { + dev_kfree_skb(skb2); + continue; + } + } + tx_dev = slave->dev; + } + } + + if (tx_dev) + res = bond_dev_queue_xmit(bond, skb, tx_dev); + +out: + if (res) + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + + /* frame sent to all suitable interfaces */ + return NETDEV_TX_OK; +} + +/*------------------------- Device initialization ---------------------------*/ + +static void bond_set_xmit_hash_policy(struct bonding *bond) +{ + switch (bond->params.xmit_policy) { + case BOND_XMIT_POLICY_LAYER23: + bond->xmit_hash_policy = bond_xmit_hash_policy_l23; + break; + case BOND_XMIT_POLICY_LAYER34: + bond->xmit_hash_policy = bond_xmit_hash_policy_l34; + break; + case BOND_XMIT_POLICY_LAYER2: + default: + bond->xmit_hash_policy = bond_xmit_hash_policy_l2; + break; + } +} + +/* + * Lookup the slave that corresponds to a qid + */ +static inline int bond_slave_override(struct bonding *bond, + struct sk_buff *skb) +{ + int i, res = 1; + struct slave *slave = NULL; + struct slave *check_slave; + + if (!skb->queue_mapping) + return 1; + + /* Find out if any slaves have the same mapping as this skb. */ + bond_for_each_slave(bond, check_slave, i) { + if (check_slave->queue_id == skb->queue_mapping) { + slave = check_slave; + break; + } + } + + /* If the slave isn't UP, use default transmit policy. */ + if (slave && slave->queue_id && IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP)) { + res = bond_dev_queue_xmit(bond, skb, slave->dev); + } + + return res; +} + + +static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) +{ + /* + * 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)->bond_queue_mapping = skb->queue_mapping; + + if (unlikely(txq >= dev->real_num_tx_queues)) { + do { + txq -= dev->real_num_tx_queues; + } while (txq >= dev->real_num_tx_queues); + } + return txq; +} + +static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct bonding *bond = netdev_priv(dev); + + if (TX_QUEUE_OVERRIDE(bond->params.mode)) { + if (!bond_slave_override(bond, skb)) + return NETDEV_TX_OK; + } + + switch (bond->params.mode) { + case BOND_MODE_ROUNDROBIN: + return bond_xmit_roundrobin(skb, dev); + case BOND_MODE_ACTIVEBACKUP: + return bond_xmit_activebackup(skb, dev); + case BOND_MODE_XOR: + return bond_xmit_xor(skb, dev); + case BOND_MODE_BROADCAST: + return bond_xmit_broadcast(skb, dev); + case BOND_MODE_8023AD: + return bond_3ad_xmit_xor(skb, dev); + case BOND_MODE_ALB: + case BOND_MODE_TLB: + return bond_alb_xmit(skb, dev); + default: + /* Should never happen, mode already checked */ + pr_err("%s: Error: Unknown bonding mode %d\n", + dev->name, bond->params.mode); + WARN_ON_ONCE(1); + dev_kfree_skb(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 (is_netpoll_tx_blocked(dev)) + return NETDEV_TX_BUSY; + + read_lock(&bond->lock); + + if (bond->slave_cnt) + ret = __bond_start_xmit(skb, dev); + else + dev_kfree_skb(skb); + + read_unlock(&bond->lock); + + return ret; +} + +/* + * set bond mode specific net device operations + */ +void bond_set_mode_ops(struct bonding *bond, int mode) +{ + struct net_device *bond_dev = bond->dev; + + switch (mode) { + case BOND_MODE_ROUNDROBIN: + break; + case BOND_MODE_ACTIVEBACKUP: + break; + case BOND_MODE_XOR: + bond_set_xmit_hash_policy(bond); + break; + case BOND_MODE_BROADCAST: + break; + case BOND_MODE_8023AD: + bond_set_xmit_hash_policy(bond); + break; + case BOND_MODE_ALB: + /* FALLTHRU */ + case BOND_MODE_TLB: + break; + default: + /* Should never happen, mode already checked */ + pr_err("%s: Error: Unknown bonding mode %d\n", + bond_dev->name, mode); + break; + } +} + +static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, + struct ethtool_drvinfo *drvinfo) +{ + strncpy(drvinfo->driver, DRV_NAME, 32); + strncpy(drvinfo->version, DRV_VERSION, 32); + snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); +} + +static const struct ethtool_ops bond_ethtool_ops = { + .get_drvinfo = bond_ethtool_get_drvinfo, + .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_multicast_list, + .ndo_change_mtu = bond_change_mtu, + .ndo_set_mac_address = bond_set_mac_address, + .ndo_neigh_setup = bond_neigh_setup, + .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_netpoll_setup = bond_netpoll_setup, + .ndo_netpoll_cleanup = bond_netpoll_cleanup, + .ndo_poll_controller = bond_poll_controller, +#endif + .ndo_add_slave = bond_enslave, + .ndo_del_slave = bond_release, + .ndo_fix_features = bond_fix_features, +}; + +static 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); +} + +static void bond_setup(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + + /* initialize rwlocks */ + rwlock_init(&bond->lock); + rwlock_init(&bond->curr_slave_lock); + + bond->params = bonding_defaults; + + /* Initialize pointers */ + bond->dev = bond_dev; + INIT_LIST_HEAD(&bond->vlan_list); + + /* Initialize the device entry points */ + ether_setup(bond_dev); + bond_dev->netdev_ops = &bond_netdev_ops; + bond_dev->ethtool_ops = &bond_ethtool_ops; + bond_set_mode_ops(bond, bond->params.mode); + + bond_dev->destructor = bond_destructor; + + /* Initialize the device options */ + bond_dev->tx_queue_len = 0; + bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; + bond_dev->priv_flags |= IFF_BONDING; + bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); + + /* At first, we block adding VLANs. That's the only way to + * prevent problems that occur when adding VLANs over an + * empty bond. The block will be removed once non-challenged + * slaves are enslaved. + */ + bond_dev->features |= NETIF_F_VLAN_CHALLENGED; + + /* don't acquire bond device's netif_tx_lock when + * transmitting */ + bond_dev->features |= NETIF_F_LLTX; + + /* By default, we declare the bond to be fully + * VLAN hardware accelerated capable. Special + * care is taken in the various xmit functions + * when there are slaves that are not hw accel + * capable + */ + + bond_dev->hw_features = BOND_VLAN_FEATURES | + NETIF_F_HW_VLAN_TX | + NETIF_F_HW_VLAN_RX | + NETIF_F_HW_VLAN_FILTER; + + bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); + bond_dev->features |= bond_dev->hw_features; +} + +static void bond_work_cancel_all(struct bonding *bond) +{ + if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) + cancel_delayed_work_sync(&bond->mii_work); + + if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) + cancel_delayed_work_sync(&bond->arp_work); + + if (bond->params.mode == BOND_MODE_ALB && + delayed_work_pending(&bond->alb_work)) + cancel_delayed_work_sync(&bond->alb_work); + + if (bond->params.mode == BOND_MODE_8023AD && + delayed_work_pending(&bond->ad_work)) + cancel_delayed_work_sync(&bond->ad_work); + + if (delayed_work_pending(&bond->mcast_work)) + cancel_delayed_work_sync(&bond->mcast_work); +} + +/* +* 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 vlan_entry *vlan, *tmp; + + bond_netpoll_cleanup(bond_dev); + + /* Release the bonded slaves */ + bond_release_all(bond_dev); + + list_del(&bond->bond_list); + + bond_work_cancel_all(bond); + + bond_remove_proc_entry(bond); + + bond_debug_unregister(bond); + + __hw_addr_flush(&bond->mc_list); + + list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { + list_del(&vlan->vlan_list); + kfree(vlan); + } +} + +/*------------------------- Module initialization ---------------------------*/ + +/* + * Convert string input module parms. Accept either the + * number of the mode or its string name. A bit complicated because + * some mode names are substrings of other names, and calls from sysfs + * may have whitespace in the name (trailing newlines, for example). + */ +int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) +{ + int modeint = -1, i, rv; + char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; + + for (p = (char *)buf; *p; p++) + if (!(isdigit(*p) || isspace(*p))) + break; + + if (*p) + rv = sscanf(buf, "%20s", modestr); + else + rv = sscanf(buf, "%d", &modeint); + + if (!rv) + return -1; + + for (i = 0; tbl[i].modename; i++) { + if (modeint == tbl[i].mode) + return tbl[i].mode; + if (strcmp(modestr, tbl[i].modename) == 0) + return tbl[i].mode; + } + + return -1; +} + +static int bond_check_params(struct bond_params *params) +{ + int arp_validate_value, fail_over_mac_value, primary_reselect_value; + + /* + * Convert string parameters. + */ + if (mode) { + bond_mode = bond_parse_parm(mode, bond_mode_tbl); + if (bond_mode == -1) { + pr_err("Error: Invalid bonding mode \"%s\"\n", + mode == NULL ? "NULL" : mode); + return -EINVAL; + } + } + + if (xmit_hash_policy) { + if ((bond_mode != BOND_MODE_XOR) && + (bond_mode != BOND_MODE_8023AD)) { + pr_info("xmit_hash_policy param is irrelevant in mode %s\n", + bond_mode_name(bond_mode)); + } else { + xmit_hashtype = bond_parse_parm(xmit_hash_policy, + xmit_hashtype_tbl); + if (xmit_hashtype == -1) { + pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", + xmit_hash_policy == NULL ? "NULL" : + xmit_hash_policy); + return -EINVAL; + } + } + } + + if (lacp_rate) { + if (bond_mode != BOND_MODE_8023AD) { + pr_info("lacp_rate param is irrelevant in mode %s\n", + bond_mode_name(bond_mode)); + } else { + lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); + if (lacp_fast == -1) { + pr_err("Error: Invalid lacp rate \"%s\"\n", + lacp_rate == NULL ? "NULL" : lacp_rate); + return -EINVAL; + } + } + } + + if (ad_select) { + params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); + if (params->ad_select == -1) { + pr_err("Error: Invalid ad_select \"%s\"\n", + ad_select == NULL ? "NULL" : ad_select); + return -EINVAL; + } + + if (bond_mode != BOND_MODE_8023AD) { + pr_warning("ad_select param only affects 802.3ad mode\n"); + } + } else { + params->ad_select = BOND_AD_STABLE; + } + + if (max_bonds < 0) { + pr_warning("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_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", + miimon, INT_MAX, BOND_LINK_MON_INTERV); + miimon = BOND_LINK_MON_INTERV; + } + + if (updelay < 0) { + pr_warning("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_warning("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_warning("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_warning("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 */ + if (bond_mode == BOND_MODE_8023AD) { + if (!miimon) { + pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n"); + pr_warning("Forcing miimon to 100msec\n"); + miimon = 100; + } + } + + if (tx_queues < 1 || tx_queues > 255) { + pr_warning("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_warning("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_warning("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; + } + + /* reset values for TLB/ALB */ + if ((bond_mode == BOND_MODE_TLB) || + (bond_mode == BOND_MODE_ALB)) { + if (!miimon) { + pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n"); + pr_warning("Forcing miimon to 100msec\n"); + miimon = 100; + } + } + + 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_warning("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_warning("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_warning("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_warning("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_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", + arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); + arp_interval = BOND_LINK_ARP_INTERV; + } + + for (arp_ip_count = 0; + (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; + arp_ip_count++) { + /* not complete check, but should be good enough to + catch mistakes */ + if (!isdigit(arp_ip_target[arp_ip_count][0])) { + pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", + arp_ip_target[arp_ip_count]); + arp_interval = 0; + } else { + __be32 ip = in_aton(arp_ip_target[arp_ip_count]); + arp_target[arp_ip_count] = ip; + } + } + + if (arp_interval && !arp_ip_count) { + /* don't allow arping if no arp_ip_target given... */ + pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", + arp_interval); + arp_interval = 0; + } + + if (arp_validate) { + if (bond_mode != BOND_MODE_ACTIVEBACKUP) { + pr_err("arp_validate only supported in active-backup mode\n"); + return -EINVAL; + } + if (!arp_interval) { + pr_err("arp_validate requires arp_interval\n"); + return -EINVAL; + } + + arp_validate_value = bond_parse_parm(arp_validate, + arp_validate_tbl); + if (arp_validate_value == -1) { + pr_err("Error: invalid arp_validate \"%s\"\n", + arp_validate == NULL ? "NULL" : arp_validate); + return -EINVAL; + } + } else + arp_validate_value = 0; + + if (miimon) { + pr_info("MII link monitoring set to %d ms\n", miimon); + } else if (arp_interval) { + int i; + + pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", + arp_interval, + arp_validate_tbl[arp_validate_value].modename, + arp_ip_count); + + for (i = 0; i < arp_ip_count; i++) + pr_info(" %s", arp_ip_target[i]); + + pr_info("\n"); + + } else if (max_bonds) { + /* miimon and arp_interval not set, we need one so things + * work as expected, see bonding.txt for details + */ + pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n"); + } + + if (primary && !USES_PRIMARY(bond_mode)) { + /* currently, using a primary only makes sense + * in active backup, TLB or ALB modes + */ + pr_warning("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) { + primary_reselect_value = bond_parse_parm(primary_reselect, + pri_reselect_tbl); + if (primary_reselect_value == -1) { + pr_err("Error: Invalid primary_reselect \"%s\"\n", + primary_reselect == + NULL ? "NULL" : primary_reselect); + return -EINVAL; + } + } else { + primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; + } + + if (fail_over_mac) { + fail_over_mac_value = bond_parse_parm(fail_over_mac, + fail_over_mac_tbl); + if (fail_over_mac_value == -1) { + pr_err("Error: invalid fail_over_mac \"%s\"\n", + arp_validate == NULL ? "NULL" : arp_validate); + return -EINVAL; + } + + if (bond_mode != BOND_MODE_ACTIVEBACKUP) + pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); + } else { + fail_over_mac_value = BOND_FOM_NONE; + } + + /* 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->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; + + 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 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); +} + +/* + * Called from registration process + */ +static int bond_init(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + pr_debug("Begin bond_init for %s\n", bond_dev->name); + + /* + * Initialize locks that may be required during + * en/deslave operations. All of the bond_open work + * (of which this is part) should really be moved to + * a phase prior to dev_open + */ + spin_lock_init(&(bond_info->tx_hashtbl_lock)); + spin_lock_init(&(bond_info->rx_hashtbl_lock)); + + bond->wq = create_singlethread_workqueue(bond_dev->name); + if (!bond->wq) + return -ENOMEM; + + bond_set_lockdep_class(bond_dev); + + bond_create_proc_entry(bond); + list_add_tail(&bond->bond_list, &bn->dev_list); + + bond_prepare_sysfs_group(bond); + + bond_debug_register(bond); + + __hw_addr_init(&bond->mc_list); + return 0; +} + +static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) +{ + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) + return -EINVAL; + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) + return -EADDRNOTAVAIL; + } + return 0; +} + +static int bond_get_tx_queues(struct net *net, struct nlattr *tb[], + unsigned int *num_queues, + unsigned int *real_num_queues) +{ + *num_queues = tx_queues; + return 0; +} + +static struct rtnl_link_ops bond_link_ops __read_mostly = { + .kind = "bond", + .priv_size = sizeof(struct bonding), + .setup = bond_setup, + .validate = bond_validate, + .get_tx_queues = bond_get_tx_queues, +}; + +/* Create a new bond based on the specified name and bonding parameters. + * If name is NULL, obtain a suitable "bond%d" name for us. + * Caller must NOT hold rtnl_lock; we need to release it here before we + * set up our sysfs entries. + */ +int bond_create(struct net *net, const char *name) +{ + struct net_device *bond_dev; + int res; + + rtnl_lock(); + + bond_dev = alloc_netdev_mq(sizeof(struct bonding), + name ? name : "bond%d", + bond_setup, tx_queues); + if (!bond_dev) { + pr_err("%s: eek! can't alloc netdev!\n", name); + rtnl_unlock(); + return -ENOMEM; + } + + dev_net_set(bond_dev, net); + bond_dev->rtnl_link_ops = &bond_link_ops; + + res = register_netdevice(bond_dev); + + netif_carrier_off(bond_dev); + + rtnl_unlock(); + if (res < 0) + bond_destructor(bond_dev); + return res; +} + +static int __net_init bond_net_init(struct net *net) +{ + struct bond_net *bn = net_generic(net, bond_net_id); + + bn->net = net; + INIT_LIST_HEAD(&bn->dev_list); + + bond_create_proc_dir(bn); + bond_create_sysfs(bn); + + return 0; +} + +static void __net_exit bond_net_exit(struct net *net) +{ + struct bond_net *bn = net_generic(net, bond_net_id); + + bond_destroy_sysfs(bn); + 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 = rtnl_link_register(&bond_link_ops); + 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: + rtnl_link_unregister(&bond_link_ops); +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(); + + rtnl_link_unregister(&bond_link_ops); + 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"); +MODULE_ALIAS_RTNL_LINK("bond"); |