diff options
Diffstat (limited to 'drivers/net/bonding/bond_main.c')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 4708 |
1 files changed, 4708 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c new file mode 100644 index 00000000000..770e28f98fd --- /dev/null +++ b/drivers/net/bonding/bond_main.c @@ -0,0 +1,4708 @@ +/* + * 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. + * + * v0.1 - first working version. + * v0.2 - changed stats to be calculated by summing slaves stats. + * + * Changes: + * Arnaldo Carvalho de Melo <acme@conectiva.com.br> + * - fix leaks on failure at bond_init + * + * 2000/09/30 - Willy Tarreau <willy at meta-x.org> + * - added trivial code to release a slave device. + * - fixed security bug (CAP_NET_ADMIN not checked) + * - implemented MII link monitoring to disable dead links : + * All MII capable slaves are checked every <miimon> milliseconds + * (100 ms seems good). This value can be changed by passing it to + * insmod. A value of zero disables the monitoring (default). + * - fixed an infinite loop in bond_xmit_roundrobin() when there's no + * good slave. + * - made the code hopefully SMP safe + * + * 2000/10/03 - Willy Tarreau <willy at meta-x.org> + * - optimized slave lists based on relevant suggestions from Thomas Davis + * - implemented active-backup method to obtain HA with two switches: + * stay as long as possible on the same active interface, while we + * also monitor the backup one (MII link status) because we want to know + * if we are able to switch at any time. ( pass "mode=1" to insmod ) + * - lots of stress testings because we need it to be more robust than the + * wires ! :-> + * + * 2000/10/09 - Willy Tarreau <willy at meta-x.org> + * - added up and down delays after link state change. + * - optimized the slaves chaining so that when we run forward, we never + * repass through the bond itself, but we can find it by searching + * backwards. Renders the deletion more difficult, but accelerates the + * scan. + * - smarter enslaving and releasing. + * - finer and more robust SMP locking + * + * 2000/10/17 - Willy Tarreau <willy at meta-x.org> + * - fixed two potential SMP race conditions + * + * 2000/10/18 - Willy Tarreau <willy at meta-x.org> + * - small fixes to the monitoring FSM in case of zero delays + * 2000/11/01 - Willy Tarreau <willy at meta-x.org> + * - fixed first slave not automatically used in trunk mode. + * 2000/11/10 : spelling of "EtherChannel" corrected. + * 2000/11/13 : fixed a race condition in case of concurrent accesses to ioctl(). + * 2000/12/16 : fixed improper usage of rtnl_exlock_nowait(). + * + * 2001/1/3 - Chad N. Tindel <ctindel at ieee dot org> + * - The bonding driver now simulates MII status monitoring, just like + * a normal network device. It will show that the link is down iff + * every slave in the bond shows that their links are down. If at least + * one slave is up, the bond's MII status will appear as up. + * + * 2001/2/7 - Chad N. Tindel <ctindel at ieee dot org> + * - Applications can now query the bond from user space to get + * information which may be useful. They do this by calling + * the BOND_INFO_QUERY ioctl. Once the app knows how many slaves + * are in the bond, it can call the BOND_SLAVE_INFO_QUERY ioctl to + * get slave specific information (# link failures, etc). See + * <linux/if_bonding.h> for more details. The structs of interest + * are ifbond and ifslave. + * + * 2001/4/5 - Chad N. Tindel <ctindel at ieee dot org> + * - Ported to 2.4 Kernel + * + * 2001/5/2 - Jeffrey E. Mast <jeff at mastfamily dot com> + * - When a device is detached from a bond, the slave device is no longer + * left thinking that is has a master. + * + * 2001/5/16 - Jeffrey E. Mast <jeff at mastfamily dot com> + * - memset did not appropriately initialized the bond rw_locks. Used + * rwlock_init to initialize to unlocked state to prevent deadlock when + * first attempting a lock + * - Called SET_MODULE_OWNER for bond device + * + * 2001/5/17 - Tim Anderson <tsa at mvista.com> + * - 2 paths for releasing for slave release; 1 through ioctl + * and 2) through close. Both paths need to release the same way. + * - the free slave in bond release is changing slave status before + * the free. The netdev_set_master() is intended to change slave state + * so it should not be done as part of the release process. + * - Simple rule for slave state at release: only the active in A/B and + * only one in the trunked case. + * + * 2001/6/01 - Tim Anderson <tsa at mvista.com> + * - Now call dev_close when releasing a slave so it doesn't screw up + * out routing table. + * + * 2001/6/01 - Chad N. Tindel <ctindel at ieee dot org> + * - Added /proc support for getting bond and slave information. + * Information is in /proc/net/<bond device>/info. + * - Changed the locking when calling bond_close to prevent deadlock. + * + * 2001/8/05 - Janice Girouard <girouard at us.ibm.com> + * - correct problem where refcnt of slave is not incremented in bond_ioctl + * so the system hangs when halting. + * - correct locking problem when unable to malloc in bond_enslave. + * - adding bond_xmit_xor logic. + * - adding multiple bond device support. + * + * 2001/8/13 - Erik Habbinga <erik_habbinga at hp dot com> + * - correct locking problem with rtnl_exlock_nowait + * + * 2001/8/23 - Janice Girouard <girouard at us.ibm.com> + * - bzero initial dev_bonds, to correct oops + * - convert SIOCDEVPRIVATE to new MII ioctl calls + * + * 2001/9/13 - Takao Indoh <indou dot takao at jp dot fujitsu dot com> + * - Add the BOND_CHANGE_ACTIVE ioctl implementation + * + * 2001/9/14 - Mark Huth <mhuth at mvista dot com> + * - Change MII_LINK_READY to not check for end of auto-negotiation, + * but only for an up link. + * + * 2001/9/20 - Chad N. Tindel <ctindel at ieee dot org> + * - Add the device field to bonding_t. Previously the net_device + * corresponding to a bond wasn't available from the bonding_t + * structure. + * + * 2001/9/25 - Janice Girouard <girouard at us.ibm.com> + * - add arp_monitor for active backup mode + * + * 2001/10/23 - Takao Indoh <indou dot takao at jp dot fujitsu dot com> + * - Various memory leak fixes + * + * 2001/11/5 - Mark Huth <mark dot huth at mvista dot com> + * - Don't take rtnl lock in bond_mii_monitor as it deadlocks under + * certain hotswap conditions. + * Note: this same change may be required in bond_arp_monitor ??? + * - Remove possibility of calling bond_sethwaddr with NULL slave_dev ptr + * - Handle hot swap ethernet interface deregistration events to remove + * kernel oops following hot swap of enslaved interface + * + * 2002/1/2 - Chad N. Tindel <ctindel at ieee dot org> + * - Restore original slave flags at release time. + * + * 2002/02/18 - Erik Habbinga <erik_habbinga at hp dot com> + * - bond_release(): calling kfree on our_slave after call to + * bond_restore_slave_flags, not before + * - bond_enslave(): saving slave flags into original_flags before + * call to netdev_set_master, so the IFF_SLAVE flag doesn't end + * up in original_flags + * + * 2002/04/05 - Mark Smith <mark.smith at comdev dot cc> and + * Steve Mead <steve.mead at comdev dot cc> + * - Port Gleb Natapov's multicast support patchs from 2.4.12 + * to 2.4.18 adding support for multicast. + * + * 2002/06/10 - Tony Cureington <tony.cureington * hp_com> + * - corrected uninitialized pointer (ifr.ifr_data) in bond_check_dev_link; + * actually changed function to use MIIPHY, then MIIREG, and finally + * ETHTOOL to determine the link status + * - fixed bad ifr_data pointer assignments in bond_ioctl + * - corrected mode 1 being reported as active-backup in bond_get_info; + * also added text to distinguish type of load balancing (rr or xor) + * - change arp_ip_target module param from "1-12s" (array of 12 ptrs) + * to "s" (a single ptr) + * + * 2002/08/30 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Removed acquisition of xmit_lock in set_multicast_list; caused + * deadlock on SMP (lock is held by caller). + * - Revamped SIOCGMIIPHY, SIOCGMIIREG portion of bond_check_dev_link(). + * + * 2002/09/18 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Fixed up bond_check_dev_link() (and callers): removed some magic + * numbers, banished local MII_ defines, wrapped ioctl calls to + * prevent EFAULT errors + * + * 2002/9/30 - Jay Vosburgh <fubar at us dot ibm dot com> + * - make sure the ip target matches the arp_target before saving the + * hw address. + * + * 2002/9/30 - Dan Eisner <eisner at 2robots dot com> + * - make sure my_ip is set before taking down the link, since + * not all switches respond if the source ip is not set. + * + * 2002/10/8 - Janice Girouard <girouard at us dot ibm dot com> + * - read in the local ip address when enslaving a device + * - add primary support + * - make sure 2*arp_interval has passed when a new device + * is brought on-line before taking it down. + * + * 2002/09/11 - Philippe De Muyter <phdm at macqel dot be> + * - Added bond_xmit_broadcast logic. + * - Added bond_mode() support function. + * + * 2002/10/26 - Laurent Deniel <laurent.deniel at free.fr> + * - allow to register multicast addresses only on active slave + * (useful in active-backup mode) + * - add multicast module parameter + * - fix deletion of multicast groups after unloading module + * + * 2002/11/06 - Kameshwara Rayaprolu <kameshwara.rao * wipro_com> + * - Changes to prevent panic from closing the device twice; if we close + * the device in bond_release, we must set the original_flags to down + * so it won't be closed again by the network layer. + * + * 2002/11/07 - Tony Cureington <tony.cureington * hp_com> + * - Fix arp_target_hw_addr memory leak + * - Created activebackup_arp_monitor function to handle arp monitoring + * in active backup mode - the bond_arp_monitor had several problems... + * such as allowing slaves to tx arps sequentially without any delay + * for a response + * - Renamed bond_arp_monitor to loadbalance_arp_monitor and re-wrote + * this function to just handle arp monitoring in load-balancing mode; + * it is a lot more compact now + * - Changes to ensure one and only one slave transmits in active-backup + * mode + * - Robustesize parameters; warn users about bad combinations of + * parameters; also if miimon is specified and a network driver does + * not support MII or ETHTOOL, inform the user of this + * - Changes to support link_failure_count when in arp monitoring mode + * - Fix up/down delay reported in /proc + * - Added version; log version; make version available from "modinfo -d" + * - Fixed problem in bond_check_dev_link - if the first IOCTL (SIOCGMIIPH) + * failed, the ETHTOOL ioctl never got a chance + * + * 2002/11/16 - Laurent Deniel <laurent.deniel at free.fr> + * - fix multicast handling in activebackup_arp_monitor + * - remove one unnecessary and confusing curr_active_slave == slave test + * in activebackup_arp_monitor + * + * 2002/11/17 - Laurent Deniel <laurent.deniel at free.fr> + * - fix bond_slave_info_query when slave_id = num_slaves + * + * 2002/11/19 - Janice Girouard <girouard at us dot ibm dot com> + * - correct ifr_data reference. Update ifr_data reference + * to mii_ioctl_data struct values to avoid confusion. + * + * 2002/11/22 - Bert Barbe <bert.barbe at oracle dot com> + * - Add support for multiple arp_ip_target + * + * 2002/12/13 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Changed to allow text strings for mode and multicast, e.g., + * insmod bonding mode=active-backup. The numbers still work. + * One change: an invalid choice will cause module load failure, + * rather than the previous behavior of just picking one. + * - Minor cleanups; got rid of dup ctype stuff, atoi function + * + * 2003/02/07 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Added use_carrier module parameter that causes miimon to + * use netif_carrier_ok() test instead of MII/ETHTOOL ioctls. + * - Minor cleanups; consolidated ioctl calls to one function. + * + * 2003/02/07 - Tony Cureington <tony.cureington * hp_com> + * - Fix bond_mii_monitor() logic error that could result in + * bonding round-robin mode ignoring links after failover/recovery + * + * 2003/03/17 - Jay Vosburgh <fubar at us dot ibm dot com> + * - kmalloc fix (GFP_KERNEL to GFP_ATOMIC) reported by + * Shmulik dot Hen at intel.com. + * - Based on discussion on mailing list, changed use of + * update_slave_cnt(), created wrapper functions for adding/removing + * slaves, changed bond_xmit_xor() to check slave_cnt instead of + * checking slave and slave->dev (which only worked by accident). + * - Misc code cleanup: get arp_send() prototype from header file, + * add max_bonds to bonding.txt. + * + * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and + * Shmulik Hen <shmulik.hen at intel dot com> + * - Make sure only bond_attach_slave() and bond_detach_slave() can + * manipulate the slave list, including slave_cnt, even when in + * bond_release_all(). + * - Fixed hang in bond_release() with traffic running: + * netdev_set_master() must not be called from within the bond lock. + * + * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and + * Shmulik Hen <shmulik.hen at intel dot com> + * - Fixed hang in bond_enslave() with traffic running: + * netdev_set_master() must not be called from within the bond lock. + * + * 2003/03/18 - Amir Noam <amir.noam at intel dot com> + * - Added support for getting slave's speed and duplex via ethtool. + * Needed for 802.3ad and other future modes. + * + * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and + * Shmulik Hen <shmulik.hen at intel dot com> + * - Enable support of modes that need to use the unique mac address of + * each slave. + * * bond_enslave(): Moved setting the slave's mac address, and + * openning it, from the application to the driver. This breaks + * backward comaptibility with old versions of ifenslave that open + * the slave before enalsving it !!!. + * * bond_release(): The driver also takes care of closing the slave + * and restoring its original mac address. + * - Removed the code that restores all base driver's flags. + * Flags are automatically restored once all undo stages are done + * properly. + * - Block possibility of enslaving before the master is up. This + * prevents putting the system in an unstable state. + * + * 2003/03/18 - Amir Noam <amir.noam at intel dot com>, + * Tsippy Mendelson <tsippy.mendelson at intel dot com> and + * Shmulik Hen <shmulik.hen at intel dot com> + * - Added support for IEEE 802.3ad Dynamic link aggregation mode. + * + * 2003/05/01 - Amir Noam <amir.noam at intel dot com> + * - Added ABI version control to restore compatibility between + * new/old ifenslave and new/old bonding. + * + * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com> + * - Fixed bug in bond_release_all(): save old value of curr_active_slave + * before setting it to NULL. + * - Changed driver versioning scheme to include version number instead + * of release date (that is already in another field). There are 3 + * fields X.Y.Z where: + * X - Major version - big behavior changes + * Y - Minor version - addition of features + * Z - Extra version - minor changes and bug fixes + * The current version is 1.0.0 as a base line. + * + * 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and + * Amir Noam <amir.noam at intel dot com> + * - Added support for lacp_rate module param. + * - Code beautification and style changes (mainly in comments). + * new version - 1.0.1 + * + * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com> + * - Based on discussion on mailing list, changed locking scheme + * to use lock/unlock or lock_bh/unlock_bh appropriately instead + * of lock_irqsave/unlock_irqrestore. The new scheme helps exposing + * hidden bugs and solves system hangs that occurred due to the fact + * that holding lock_irqsave doesn't prevent softirqs from running. + * This also increases total throughput since interrupts are not + * blocked on each transmitted packets or monitor timeout. + * new version - 2.0.0 + * + * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com> + * - Added support for Transmit load balancing mode. + * - Concentrate all assignments of curr_active_slave to a single point + * so specific modes can take actions when the primary adapter is + * changed. + * - Take the updelay parameter into consideration during bond_enslave + * since some adapters loose their link during setting the device. + * - Renamed bond_3ad_link_status_changed() to + * bond_3ad_handle_link_change() for compatibility with TLB. + * new version - 2.1.0 + * + * 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com> + * - Added support for Adaptive load balancing mode which is + * equivalent to Transmit load balancing + Receive load balancing. + * new version - 2.2.0 + * + * 2003/05/15 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Applied fix to activebackup_arp_monitor posted to bonding-devel + * by Tony Cureington <tony.cureington * hp_com>. Fixes ARP + * monitor endless failover bug. Version to 2.2.10 + * + * 2003/05/20 - Amir Noam <amir.noam at intel dot com> + * - Fixed bug in ABI version control - Don't commit to a specific + * ABI version if receiving unsupported ioctl commands. + * + * 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com> + * - Fix ifenslave -c causing bond to loose existing routes; + * added bond_set_mac_address() that doesn't require the + * bond to be down. + * - In conjunction with fix for ifenslave -c, in + * bond_change_active(), changing to the already active slave + * is no longer an error (it successfully does nothing). + * + * 2003/06/30 - Amir Noam <amir.noam at intel dot com> + * - Fixed bond_change_active() for ALB/TLB modes. + * Version to 2.2.14. + * + * 2003/07/29 - Amir Noam <amir.noam at intel dot com> + * - Fixed ARP monitoring bug. + * Version to 2.2.15. + * + * 2003/07/31 - Willy Tarreau <willy at ods dot org> + * - Fixed kernel panic when using ARP monitoring without + * setting bond's IP address. + * Version to 2.2.16. + * + * 2003/08/06 - Amir Noam <amir.noam at intel dot com> + * - Back port from 2.6: use alloc_netdev(); fix /proc handling; + * made stats a part of bond struct so no need to allocate + * and free it separately; use standard list operations instead + * of pre-allocated array of bonds. + * Version to 2.3.0. + * + * 2003/08/07 - Jay Vosburgh <fubar at us dot ibm dot com>, + * Amir Noam <amir.noam at intel dot com> and + * Shmulik Hen <shmulik.hen at intel dot com> + * - Propagating master's settings: Distinguish between modes that + * use a primary slave from those that don't, and propagate settings + * accordingly; Consolidate change_active opeartions and add + * reselect_active and find_best opeartions; Decouple promiscuous + * handling from the multicast mode setting; Add support for changing + * HW address and MTU with proper unwind; Consolidate procfs code, + * add CHANGENAME handler; Enhance netdev notification handling. + * Version to 2.4.0. + * + * 2003/09/15 - Stephen Hemminger <shemminger at osdl dot org>, + * Amir Noam <amir.noam at intel dot com> + * - Convert /proc to seq_file interface. + * Change /proc/net/bondX/info to /proc/net/bonding/bondX. + * Set version to 2.4.1. + * + * 2003/11/20 - Amir Noam <amir.noam at intel dot com> + * - Fix /proc creation/destruction. + * + * 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com> + * - Massive cleanup - Set version to 2.5.0 + * Code changes: + * o Consolidate format of prints and debug prints. + * o Remove bonding_t/slave_t typedefs and consolidate all casts. + * o Remove dead code and unnecessary checks. + * o Consolidate starting/stopping timers. + * o Consolidate handling of primary module param throughout the code. + * o Removed multicast module param support - all settings are done + * according to mode. + * o Slave list iteration - bond is no longer part of the list, + * added cyclic list iteration macros. + * o Consolidate error handling in all xmit functions. + * Style changes: + * o Consolidate function naming and declarations. + * o Consolidate function params and local variables names. + * o Consolidate return values. + * o Consolidate curly braces. + * o Consolidate conditionals format. + * o Change struct member names and types. + * o Chomp trailing spaces, remove empty lines, fix indentations. + * o Re-organize code according to context. + * + * 2003/12/30 - Amir Noam <amir.noam at intel dot com> + * - Fixed: Cannot remove and re-enslave the original active slave. + * - Fixed: Releasing the original active slave causes mac address + * duplication. + * - Add support for slaves that use ethtool_ops. + * Set version to 2.5.3. + * + * 2004/01/05 - Amir Noam <amir.noam at intel dot com> + * - Save bonding parameters per bond instead of using the global values. + * Set version to 2.5.4. + * + * 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com> + * - Enhance VLAN support: + * * Add support for VLAN hardware acceleration capable slaves. + * * Add capability to tag self generated packets in ALB/TLB modes. + * Set version to 2.6.0. + * 2004/10/29 - Mitch Williams <mitch.a.williams at intel dot com> + * - Fixed bug when unloading module while using 802.3ad. If + * spinlock debugging is turned on, this causes a stack dump. + * Solution is to move call to dev_remove_pack outside of the + * spinlock. + * Set version to 2.6.1. + * + */ + +//#define BONDING_DEBUG 1 + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/timer.h> +#include <linux/socket.h> +#include <linux/ctype.h> +#include <linux/inet.h> +#include <linux/bitops.h> +#include <asm/system.h> +#include <asm/io.h> +#include <asm/dma.h> +#include <asm/uaccess.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/rtnetlink.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/smp.h> +#include <linux/if_ether.h> +#include <net/arp.h> +#include <linux/mii.h> +#include <linux/ethtool.h> +#include <linux/if_vlan.h> +#include <linux/if_bonding.h> +#include "bonding.h" +#include "bond_3ad.h" +#include "bond_alb.h" + +/*---------------------------- Module parameters ----------------------------*/ + +/* monitor all links that often (in milliseconds). <=0 disables monitoring */ +#define BOND_LINK_MON_INTERV 0 +#define BOND_LINK_ARP_INTERV 0 + +static int max_bonds = BOND_DEFAULT_MAX_BONDS; +static int miimon = BOND_LINK_MON_INTERV; +static int updelay = 0; +static int downdelay = 0; +static int use_carrier = 1; +static char *mode = NULL; +static char *primary = NULL; +static char *lacp_rate = NULL; +static int arp_interval = BOND_LINK_ARP_INTERV; +static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, }; + +module_param(max_bonds, int, 0); +MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); +module_param(miimon, int, 0); +MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); +module_param(updelay, int, 0); +MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); +module_param(downdelay, int, 0); +MODULE_PARM_DESC(downdelay, "Delay before considering link down, in milliseconds"); +module_param(use_carrier, int, 0); +MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; 0 for off, 1 for on (default)"); +module_param(mode, charp, 0); +MODULE_PARM_DESC(mode, "Mode of operation : 0 for round robin, 1 for active-backup, 2 for xor"); +module_param(primary, charp, 0); +MODULE_PARM_DESC(primary, "Primary network device to use"); +module_param(lacp_rate, charp, 0); +MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner (slow/fast)"); +module_param(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"); + +/*----------------------------- Global variables ----------------------------*/ + +static const char *version = + DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"; + +static LIST_HEAD(bond_dev_list); + +#ifdef CONFIG_PROC_FS +static struct proc_dir_entry *bond_proc_dir = NULL; +#endif + +static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ; +static int arp_ip_count = 0; +static u32 my_ip = 0; +static int bond_mode = BOND_MODE_ROUNDROBIN; +static int lacp_fast = 0; +static int app_abi_ver = 0; +static int orig_app_abi_ver = -1; /* This is used to save the first ABI version + * we receive from the application. Once set, + * it won't be changed, and the module will + * refuse to enslave/release interfaces if the + * command comes from an application using + * another ABI version. + */ + +struct bond_parm_tbl { + char *modename; + int mode; +}; + +static struct bond_parm_tbl bond_lacp_tbl[] = { +{ "slow", AD_LACP_SLOW}, +{ "fast", AD_LACP_FAST}, +{ NULL, -1}, +}; + +static 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}, +}; + +/*-------------------------- Forward declarations ---------------------------*/ + +static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode); + +/*---------------------------- General routines -----------------------------*/ + +static const char *bond_mode_name(int mode) +{ + switch (mode) { + case BOND_MODE_ROUNDROBIN : + return "load balancing (round-robin)"; + case BOND_MODE_ACTIVEBACKUP : + return "fault-tolerance (active-backup)"; + case BOND_MODE_XOR : + return "load balancing (xor)"; + case BOND_MODE_BROADCAST : + return "fault-tolerance (broadcast)"; + case BOND_MODE_8023AD: + return "IEEE 802.3ad Dynamic link aggregation"; + case BOND_MODE_TLB: + return "transmit load balancing"; + case BOND_MODE_ALB: + return "adaptive load balancing"; + default: + return "unknown"; + } +} + +/*---------------------------------- VLAN -----------------------------------*/ + +/** + * bond_add_vlan - add a new vlan id on bond + * @bond: bond that got the notification + * @vlan_id: the vlan id to add + * + * Returns -ENOMEM if allocation failed. + */ +static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) +{ + struct vlan_entry *vlan; + + dprintk("bond: %s, vlan id %d\n", + (bond ? bond->dev->name: "None"), vlan_id); + + vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL); + if (!vlan) { + return -ENOMEM; + } + + INIT_LIST_HEAD(&vlan->vlan_list); + vlan->vlan_id = vlan_id; + + write_lock_bh(&bond->lock); + + list_add_tail(&vlan->vlan_list, &bond->vlan_list); + + write_unlock_bh(&bond->lock); + + dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); + + return 0; +} + +/** + * bond_del_vlan - delete a vlan id from bond + * @bond: bond that got the notification + * @vlan_id: the vlan id to delete + * + * returns -ENODEV if @vlan_id was not found in @bond. + */ +static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) +{ + struct vlan_entry *vlan, *next; + int res = -ENODEV; + + dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); + + write_lock_bh(&bond->lock); + + list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) { + if (vlan->vlan_id == vlan_id) { + list_del(&vlan->vlan_list); + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + bond_alb_clear_vlan(bond, vlan_id); + } + + dprintk("removed VLAN ID %d from bond %s\n", vlan_id, + bond->dev->name); + + kfree(vlan); + + if (list_empty(&bond->vlan_list) && + (bond->slave_cnt == 0)) { + /* Last VLAN removed and no slaves, so + * restore block on adding VLANs. This will + * be removed once new slaves that are not + * VLAN challenged will be added. + */ + bond->dev->features |= NETIF_F_VLAN_CHALLENGED; + } + + res = 0; + goto out; + } + } + + dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id, + bond->dev->name); + +out: + write_unlock_bh(&bond->lock); + return res; +} + +/** + * bond_has_challenged_slaves + * @bond: the bond we're working on + * + * Searches the slave list. Returns 1 if a vlan challenged slave + * was found, 0 otherwise. + * + * Assumes bond->lock is held. + */ +static int bond_has_challenged_slaves(struct bonding *bond) +{ + struct slave *slave; + int i; + + bond_for_each_slave(bond, slave, i) { + if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) { + dprintk("found VLAN challenged slave - %s\n", + slave->dev->name); + return 1; + } + } + + dprintk("no VLAN challenged slaves found\n"); + return 0; +} + +/** + * bond_next_vlan - safely skip to the next item in the vlans list. + * @bond: the bond we're working on + * @curr: item we're advancing from + * + * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, + * or @curr->next otherwise (even if it is @curr itself again). + * + * Caller must hold bond->lock + */ +struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) +{ + struct vlan_entry *next, *last; + + if (list_empty(&bond->vlan_list)) { + return NULL; + } + + if (!curr) { + next = list_entry(bond->vlan_list.next, + struct vlan_entry, vlan_list); + } else { + last = list_entry(bond->vlan_list.prev, + struct vlan_entry, vlan_list); + if (last == curr) { + next = list_entry(bond->vlan_list.next, + struct vlan_entry, vlan_list); + } else { + next = list_entry(curr->vlan_list.next, + struct vlan_entry, vlan_list); + } + } + + return next; +} + +/** + * bond_dev_queue_xmit - Prepare skb for xmit. + * + * @bond: bond device that got this skb for tx. + * @skb: hw accel VLAN tagged skb to transmit + * @slave_dev: slave that is supposed to xmit this skbuff + * + * When the bond gets an skb to transmit that is + * already hardware accelerated VLAN tagged, and it + * needs to relay this skb to a slave that is not + * hw accel capable, the skb needs to be "unaccelerated", + * i.e. strip the hwaccel tag and re-insert it as part + * of the payload. + */ +int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev) +{ + unsigned short vlan_id; + + if (!list_empty(&bond->vlan_list) && + !(slave_dev->features & NETIF_F_HW_VLAN_TX) && + vlan_get_tag(skb, &vlan_id) == 0) { + skb->dev = slave_dev; + skb = vlan_put_tag(skb, vlan_id); + if (!skb) { + /* vlan_put_tag() frees the skb in case of error, + * so return success here so the calling functions + * won't attempt to free is again. + */ + return 0; + } + } else { + skb->dev = slave_dev; + } + + skb->priority = 1; + dev_queue_xmit(skb); + + return 0; +} + +/* + * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid + * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a + * lock because: + * a. This operation is performed in IOCTL context, + * b. The operation is protected by the RTNL semaphore in the 8021q code, + * c. Holding a lock with BH disabled while directly calling a base driver + * entry point is generally a BAD idea. + * + * The design of synchronization/protection for this operation in the 8021q + * module is good for one or more VLAN devices over a single physical device + * and cannot be extended for a teaming solution like bonding, so there is a + * potential race condition here where a net device from the vlan group might + * be referenced (either by a base driver or the 8021q code) while it is being + * removed from the system. However, it turns out we're not making matters + * worse, and if it works for regular VLAN usage it will work here too. +*/ + +/** + * bond_vlan_rx_register - Propagates registration to slaves + * @bond_dev: bonding net device that got called + * @grp: vlan group being registered + */ +static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + int i; + + bond->vlgrp = grp; + + bond_for_each_slave(bond, slave, i) { + struct net_device *slave_dev = slave->dev; + + if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && + slave_dev->vlan_rx_register) { + slave_dev->vlan_rx_register(slave_dev, grp); + } + } +} + +/** + * bond_vlan_rx_add_vid - Propagates adding an id to slaves + * @bond_dev: bonding net device that got called + * @vid: vlan id being added + */ +static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + int i, res; + + bond_for_each_slave(bond, slave, i) { + struct net_device *slave_dev = slave->dev; + + if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && + slave_dev->vlan_rx_add_vid) { + slave_dev->vlan_rx_add_vid(slave_dev, vid); + } + } + + res = bond_add_vlan(bond, vid); + if (res) { + printk(KERN_ERR DRV_NAME + ": %s: Failed to add vlan id %d\n", + bond_dev->name, vid); + } +} + +/** + * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves + * @bond_dev: bonding net device that got called + * @vid: vlan id being removed + */ +static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + struct net_device *vlan_dev; + int i, res; + + bond_for_each_slave(bond, slave, i) { + struct net_device *slave_dev = slave->dev; + + if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && + slave_dev->vlan_rx_kill_vid) { + /* Save and then restore vlan_dev in the grp array, + * since the slave's driver might clear it. + */ + vlan_dev = bond->vlgrp->vlan_devices[vid]; + slave_dev->vlan_rx_kill_vid(slave_dev, vid); + bond->vlgrp->vlan_devices[vid] = vlan_dev; + } + } + + res = bond_del_vlan(bond, vid); + if (res) { + printk(KERN_ERR DRV_NAME + ": %s: Failed to remove vlan id %d\n", + bond_dev->name, vid); + } +} + +static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) +{ + struct vlan_entry *vlan; + + write_lock_bh(&bond->lock); + + if (list_empty(&bond->vlan_list)) { + goto out; + } + + if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && + slave_dev->vlan_rx_register) { + slave_dev->vlan_rx_register(slave_dev, bond->vlgrp); + } + + if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || + !(slave_dev->vlan_rx_add_vid)) { + goto out; + } + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id); + } + +out: + write_unlock_bh(&bond->lock); +} + +static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev) +{ + struct vlan_entry *vlan; + struct net_device *vlan_dev; + + write_lock_bh(&bond->lock); + + if (list_empty(&bond->vlan_list)) { + goto out; + } + + if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || + !(slave_dev->vlan_rx_kill_vid)) { + goto unreg; + } + + list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { + /* Save and then restore vlan_dev in the grp array, + * since the slave's driver might clear it. + */ + vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id]; + slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id); + bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev; + } + +unreg: + if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && + slave_dev->vlan_rx_register) { + slave_dev->vlan_rx_register(slave_dev, NULL); + } + +out: + write_unlock_bh(&bond->lock); +} + +/*------------------------------- Link status -------------------------------*/ + +/* + * Get link speed and duplex from the slave's base driver + * using ethtool. If for some reason the call fails or the + * values are invalid, fake speed and duplex to 100/Full + * and return error. + */ +static int bond_update_speed_duplex(struct slave *slave) +{ + struct net_device *slave_dev = slave->dev; + static int (* ioctl)(struct net_device *, struct ifreq *, int); + struct ifreq ifr; + struct ethtool_cmd etool; + + /* Fake speed and duplex */ + slave->speed = SPEED_100; + slave->duplex = DUPLEX_FULL; + + if (slave_dev->ethtool_ops) { + u32 res; + + if (!slave_dev->ethtool_ops->get_settings) { + return -1; + } + + res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool); + if (res < 0) { + return -1; + } + + goto verify; + } + + ioctl = slave_dev->do_ioctl; + strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); + etool.cmd = ETHTOOL_GSET; + ifr.ifr_data = (char*)&etool; + if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) { + return -1; + } + +verify: + switch (etool.speed) { + case SPEED_10: + case SPEED_100: + case SPEED_1000: + break; + default: + return -1; + } + + switch (etool.duplex) { + case DUPLEX_FULL: + case DUPLEX_HALF: + break; + default: + return -1; + } + + slave->speed = etool.speed; + slave->duplex = etool.duplex; + + return 0; +} + +/* + * if <dev> supports MII link status reporting, check its link status. + * + * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), + * depening upon the setting of the use_carrier parameter. + * + * Return either BMSR_LSTATUS, meaning that the link is up (or we + * can't tell and just pretend it is), or 0, meaning that the link is + * down. + * + * If reporting is non-zero, instead of faking link up, return -1 if + * both ETHTOOL and MII ioctls fail (meaning the device does not + * support them). If use_carrier is set, return whatever it says. + * It'd be nice if there was a good way to tell if a driver supports + * netif_carrier, but there really isn't. + */ +static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting) +{ + static int (* ioctl)(struct net_device *, struct ifreq *, int); + struct ifreq ifr; + struct mii_ioctl_data *mii; + struct ethtool_value etool; + + if (bond->params.use_carrier) { + return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; + } + + ioctl = slave_dev->do_ioctl; + if (ioctl) { + /* TODO: set pointer to correct ioctl on a per team member */ + /* bases to make this more efficient. that is, once */ + /* we determine the correct ioctl, we will always */ + /* call it and not the others for that team */ + /* member. */ + + /* + * We cannot assume that SIOCGMIIPHY will also read a + * register; not all network drivers (e.g., e100) + * support that. + */ + + /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ + strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); + mii = if_mii(&ifr); + if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { + mii->reg_num = MII_BMSR; + if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) { + return (mii->val_out & BMSR_LSTATUS); + } + } + } + + /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */ + /* for a period of time so we attempt to get link status */ + /* from it last if the above MII ioctls fail... */ + if (slave_dev->ethtool_ops) { + if (slave_dev->ethtool_ops->get_link) { + u32 link; + + link = slave_dev->ethtool_ops->get_link(slave_dev); + + return link ? BMSR_LSTATUS : 0; + } + } + + if (ioctl) { + strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); + etool.cmd = ETHTOOL_GLINK; + ifr.ifr_data = (char*)&etool; + if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) { + if (etool.data == 1) { + return BMSR_LSTATUS; + } else { + dprintk("SIOCETHTOOL shows link down\n"); + return 0; + } + } + } + + /* + * If reporting, report that either there's no dev->do_ioctl, + * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we + * cannot report link status). If not reporting, pretend + * we're ok. + */ + return (reporting ? -1 : BMSR_LSTATUS); +} + +/*----------------------------- Multicast list ------------------------------*/ + +/* + * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise + */ +static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2) +{ + return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 && + dmi1->dmi_addrlen == dmi2->dmi_addrlen; +} + +/* + * returns dmi entry if found, NULL otherwise + */ +static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list) +{ + struct dev_mc_list *idmi; + + for (idmi = mc_list; idmi; idmi = idmi->next) { + if (bond_is_dmi_same(dmi, idmi)) { + return idmi; + } + } + + return NULL; +} + +/* + * Push the promiscuity flag down to appropriate slaves + */ +static void bond_set_promiscuity(struct bonding *bond, int inc) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + dev_set_promiscuity(bond->curr_active_slave->dev, inc); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + dev_set_promiscuity(slave->dev, inc); + } + } +} + +/* + * Push the allmulti flag down to all slaves + */ +static void bond_set_allmulti(struct bonding *bond, int inc) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + dev_set_allmulti(bond->curr_active_slave->dev, inc); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + dev_set_allmulti(slave->dev, inc); + } + } +} + +/* + * Add a Multicast address to slaves + * according to mode + */ +static void bond_mc_add(struct bonding *bond, void *addr, int alen) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + dev_mc_add(slave->dev, addr, alen, 0); + } + } +} + +/* + * Remove a multicast address from slave + * according to mode + */ +static void bond_mc_delete(struct bonding *bond, void *addr, int alen) +{ + if (USES_PRIMARY(bond->params.mode)) { + /* write lock already acquired */ + if (bond->curr_active_slave) { + dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0); + } + } else { + struct slave *slave; + int i; + bond_for_each_slave(bond, slave, i) { + dev_mc_delete(slave->dev, addr, alen, 0); + } + } +} + +/* + * Totally destroys the mc_list in bond + */ +static void bond_mc_list_destroy(struct bonding *bond) +{ + struct dev_mc_list *dmi; + + dmi = bond->mc_list; + while (dmi) { + bond->mc_list = dmi->next; + kfree(dmi); + dmi = bond->mc_list; + } +} + +/* + * Copy all the Multicast addresses from src to the bonding device dst + */ +static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond, int gpf_flag) +{ + struct dev_mc_list *dmi, *new_dmi; + + for (dmi = mc_list; dmi; dmi = dmi->next) { + new_dmi = kmalloc(sizeof(struct dev_mc_list), gpf_flag); + + if (!new_dmi) { + /* FIXME: Potential memory leak !!! */ + return -ENOMEM; + } + + new_dmi->next = bond->mc_list; + bond->mc_list = new_dmi; + new_dmi->dmi_addrlen = dmi->dmi_addrlen; + memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen); + new_dmi->dmi_users = dmi->dmi_users; + new_dmi->dmi_gusers = dmi->dmi_gusers; + } + + return 0; +} + +/* + * flush all members of flush->mc_list from device dev->mc_list + */ +static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = bond_dev->priv; + struct dev_mc_list *dmi; + + for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) { + dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0); + } + + if (bond->params.mode == BOND_MODE_8023AD) { + /* del lacpdu mc addr from mc list */ + u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; + + dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0); + } +} + +/*--------------------------- Active slave change ---------------------------*/ + +/* + * Update the mc list and multicast-related flags for the new and + * old active slaves (if any) according to the multicast mode, and + * promiscuous flags unconditionally. + */ +static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active) +{ + struct dev_mc_list *dmi; + + if (!USES_PRIMARY(bond->params.mode)) { + /* nothing to do - mc list is already up-to-date on + * all slaves + */ + return; + } + + if (old_active) { + if (bond->dev->flags & IFF_PROMISC) { + dev_set_promiscuity(old_active->dev, -1); + } + + if (bond->dev->flags & IFF_ALLMULTI) { + dev_set_allmulti(old_active->dev, -1); + } + + for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) { + dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0); + } + } + + if (new_active) { + if (bond->dev->flags & IFF_PROMISC) { + dev_set_promiscuity(new_active->dev, 1); + } + + if (bond->dev->flags & IFF_ALLMULTI) { + dev_set_allmulti(new_active->dev, 1); + } + + for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) { + dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0); + } + } +} + +/** + * find_best_interface - select the best available slave to be the active one + * @bond: our bonding struct + * + * Warning: Caller must hold curr_slave_lock for writing. + */ +static struct slave *bond_find_best_slave(struct bonding *bond) +{ + struct slave *new_active, *old_active; + struct slave *bestslave = NULL; + int mintime = bond->params.updelay; + int i; + + new_active = old_active = bond->curr_active_slave; + + if (!new_active) { /* there were no active slaves left */ + if (bond->slave_cnt > 0) { /* found one slave */ + new_active = bond->first_slave; + } else { + return NULL; /* still no slave, return NULL */ + } + } + + /* first try the primary link; if arping, a link must tx/rx traffic + * before it can be considered the curr_active_slave - also, we would skip + * slaves between the curr_active_slave and primary_slave that may be up + * and able to arp + */ + if ((bond->primary_slave) && + (!bond->params.arp_interval) && + (IS_UP(bond->primary_slave->dev))) { + new_active = bond->primary_slave; + } + + /* remember where to stop iterating over the slaves */ + old_active = new_active; + + bond_for_each_slave_from(bond, new_active, i, old_active) { + if (IS_UP(new_active->dev)) { + if (new_active->link == BOND_LINK_UP) { + return new_active; + } else if (new_active->link == BOND_LINK_BACK) { + /* link up, but waiting for stabilization */ + if (new_active->delay < mintime) { + mintime = new_active->delay; + bestslave = new_active; + } + } + } + } + + return bestslave; +} + +/** + * change_active_interface - change the active slave into the specified one + * @bond: our bonding struct + * @new: the new slave to make the active one + * + * Set the new slave to the bond's settings and unset them on the old + * curr_active_slave. + * Setting include flags, mc-list, promiscuity, allmulti, etc. + * + * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, + * because it is apparently the best available slave we have, even though its + * updelay hasn't timed out yet. + * + * Warning: Caller must hold curr_slave_lock for writing. + */ +static void bond_change_active_slave(struct bonding *bond, struct slave *new_active) +{ + struct slave *old_active = bond->curr_active_slave; + + if (old_active == new_active) { + return; + } + + if (new_active) { + if (new_active->link == BOND_LINK_BACK) { + if (USES_PRIMARY(bond->params.mode)) { + printk(KERN_INFO DRV_NAME + ": %s: making interface %s the new " + "active one %d ms earlier.\n", + bond->dev->name, new_active->dev->name, + (bond->params.updelay - new_active->delay) * bond->params.miimon); + } + + new_active->delay = 0; + new_active->link = BOND_LINK_UP; + new_active->jiffies = jiffies; + + if (bond->params.mode == BOND_MODE_8023AD) { + bond_3ad_handle_link_change(new_active, BOND_LINK_UP); + } + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); + } + } else { + if (USES_PRIMARY(bond->params.mode)) { + printk(KERN_INFO DRV_NAME + ": %s: making interface %s the new " + "active one.\n", + bond->dev->name, new_active->dev->name); + } + } + } + + if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { + if (old_active) { + bond_set_slave_inactive_flags(old_active); + } + + if (new_active) { + bond_set_slave_active_flags(new_active); + } + } + + if (USES_PRIMARY(bond->params.mode)) { + bond_mc_swap(bond, new_active, old_active); + } + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + bond_alb_handle_active_change(bond, new_active); + } else { + bond->curr_active_slave = new_active; + } +} + +/** + * bond_select_active_slave - select a new active slave, if needed + * @bond: our bonding struct + * + * This functions shoud be called when one of the following occurs: + * - The old curr_active_slave has been released or lost its link. + * - The primary_slave has got its link back. + * - A slave has got its link back and there's no old curr_active_slave. + * + * Warning: Caller must hold curr_slave_lock for writing. + */ +static void bond_select_active_slave(struct bonding *bond) +{ + struct slave *best_slave; + + best_slave = bond_find_best_slave(bond); + if (best_slave != bond->curr_active_slave) { + bond_change_active_slave(bond, best_slave); + } +} + +/*--------------------------- slave list handling ---------------------------*/ + +/* + * This function attaches the slave to the end of list. + * + * bond->lock held for writing by caller. + */ +static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) +{ + if (bond->first_slave == NULL) { /* attaching the first slave */ + new_slave->next = new_slave; + new_slave->prev = new_slave; + bond->first_slave = new_slave; + } else { + new_slave->next = bond->first_slave; + new_slave->prev = bond->first_slave->prev; + new_slave->next->prev = new_slave; + new_slave->prev->next = new_slave; + } + + bond->slave_cnt++; +} + +/* + * This function detaches the slave from the list. + * WARNING: no check is made to verify if the slave effectively + * belongs to <bond>. + * Nothing is freed on return, structures are just unchained. + * If any slave pointer in bond was pointing to <slave>, + * it should be changed by the calling function. + * + * bond->lock held for writing by caller. + */ +static void bond_detach_slave(struct bonding *bond, struct slave *slave) +{ + if (slave->next) { + slave->next->prev = slave->prev; + } + + if (slave->prev) { + slave->prev->next = slave->next; + } + + if (bond->first_slave == slave) { /* slave is the first slave */ + if (bond->slave_cnt > 1) { /* there are more slave */ + bond->first_slave = slave->next; + } else { + bond->first_slave = NULL; /* slave was the last one */ + } + } + + slave->next = NULL; + slave->prev = NULL; + bond->slave_cnt--; +} + +/*---------------------------------- IOCTL ----------------------------------*/ + +static int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev) +{ + dprintk("bond_dev=%p\n", bond_dev); + dprintk("slave_dev=%p\n", slave_dev); + dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len); + memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); + return 0; +} + +/* enslave device <slave> to bond device <master> */ +static int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *new_slave = NULL; + struct dev_mc_list *dmi; + struct sockaddr addr; + int link_reporting; + int old_features = bond_dev->features; + int res = 0; + + if (slave_dev->do_ioctl == NULL) { + printk(KERN_WARNING DRV_NAME + ": Warning : no link monitoring support for %s\n", + slave_dev->name); + } + + /* bond must be initialized by bond_open() before enslaving */ + if (!(bond_dev->flags & IFF_UP)) { + dprintk("Error, master_dev is not up\n"); + return -EPERM; + } + + /* already enslaved */ + if (slave_dev->flags & IFF_SLAVE) { + dprintk("Error, Device was already enslaved\n"); + return -EBUSY; + } + + /* vlan challenged mutual exclusion */ + /* no need to lock since we're protected by rtnl_lock */ + if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { + dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); + if (!list_empty(&bond->vlan_list)) { + printk(KERN_ERR DRV_NAME + ": Error: cannot enslave VLAN " + "challenged slave %s on VLAN enabled " + "bond %s\n", slave_dev->name, + bond_dev->name); + return -EPERM; + } else { + printk(KERN_WARNING DRV_NAME + ": Warning: enslaved VLAN challenged " + "slave %s. Adding VLANs will be blocked as " + "long as %s is part of bond %s\n", + slave_dev->name, slave_dev->name, + bond_dev->name); + bond_dev->features |= NETIF_F_VLAN_CHALLENGED; + } + } else { + dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); + if (bond->slave_cnt == 0) { + /* First slave, and it is not VLAN challenged, + * so remove the block of adding VLANs over the bond. + */ + bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED; + } + } + + if (app_abi_ver >= 1) { + /* The application is using an ABI, which requires the + * slave interface to be closed. + */ + if ((slave_dev->flags & IFF_UP)) { + printk(KERN_ERR DRV_NAME + ": Error: %s is up\n", + slave_dev->name); + res = -EPERM; + goto err_undo_flags; + } + + if (slave_dev->set_mac_address == NULL) { + printk(KERN_ERR DRV_NAME + ": Error: The slave device you specified does " + "not support setting the MAC address.\n"); + printk(KERN_ERR + "Your kernel likely does not support slave " + "devices.\n"); + + res = -EOPNOTSUPP; + goto err_undo_flags; + } + } else { + /* The application is not using an ABI, which requires the + * slave interface to be open. + */ + if (!(slave_dev->flags & IFF_UP)) { + printk(KERN_ERR DRV_NAME + ": Error: %s is not running\n", + slave_dev->name); + res = -EINVAL; + goto err_undo_flags; + } + + if ((bond->params.mode == BOND_MODE_8023AD) || + (bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + printk(KERN_ERR DRV_NAME + ": Error: to use %s mode, you must upgrade " + "ifenslave.\n", + bond_mode_name(bond->params.mode)); + res = -EOPNOTSUPP; + goto err_undo_flags; + } + } + + new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL); + if (!new_slave) { + res = -ENOMEM; + goto err_undo_flags; + } + + memset(new_slave, 0, sizeof(struct slave)); + + /* save slave's original flags before calling + * netdev_set_master and dev_open + */ + new_slave->original_flags = slave_dev->flags; + + if (app_abi_ver >= 1) { + /* save slave's original ("permanent") mac address for + * modes that needs it, and for restoring it upon release, + * and then set it to the master's address + */ + memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); + + /* set slave to master's mac address + * The application already set the master's + * mac address to that of the first slave + */ + memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); + addr.sa_family = slave_dev->type; + res = dev_set_mac_address(slave_dev, &addr); + if (res) { + dprintk("Error %d calling set_mac_address\n", res); + goto err_free; + } + + /* open the slave since the application closed it */ + res = dev_open(slave_dev); + if (res) { + dprintk("Openning slave %s failed\n", slave_dev->name); + goto err_restore_mac; + } + } + + res = netdev_set_master(slave_dev, bond_dev); + if (res) { + dprintk("Error %d calling netdev_set_master\n", res); + if (app_abi_ver < 1) { + goto err_free; + } else { + goto err_close; + } + } + + new_slave->dev = slave_dev; + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + /* bond_alb_init_slave() must be called before all other stages since + * it might fail and we do not want to have to undo everything + */ + res = bond_alb_init_slave(bond, new_slave); + if (res) { + goto err_unset_master; + } + } + + /* If the mode USES_PRIMARY, then the new slave gets the + * master's promisc (and mc) settings only if it becomes the + * curr_active_slave, and that is taken care of later when calling + * bond_change_active() + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* set promiscuity level to new slave */ + if (bond_dev->flags & IFF_PROMISC) { + dev_set_promiscuity(slave_dev, 1); + } + + /* set allmulti level to new slave */ + if (bond_dev->flags & IFF_ALLMULTI) { + dev_set_allmulti(slave_dev, 1); + } + + /* upload master's mc_list to new slave */ + for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) { + dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0); + } + } + + if (bond->params.mode == BOND_MODE_8023AD) { + /* add lacpdu mc addr to mc list */ + u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; + + dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0); + } + + bond_add_vlans_on_slave(bond, slave_dev); + + write_lock_bh(&bond->lock); + + bond_attach_slave(bond, new_slave); + + new_slave->delay = 0; + new_slave->link_failure_count = 0; + + if (bond->params.miimon && !bond->params.use_carrier) { + link_reporting = bond_check_dev_link(bond, slave_dev, 1); + + if ((link_reporting == -1) && !bond->params.arp_interval) { + /* + * miimon is set but a bonded network driver + * does not support ETHTOOL/MII and + * arp_interval is not set. Note: if + * use_carrier is enabled, we will never go + * here (because netif_carrier is always + * supported); thus, we don't need to change + * the messages for netif_carrier. + */ + printk(KERN_WARNING DRV_NAME + ": 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", + slave_dev->name); + } else if (link_reporting == -1) { + /* unable get link status using mii/ethtool */ + printk(KERN_WARNING DRV_NAME + ": 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", + slave_dev->name); + } + } + + /* check for initial state */ + if (!bond->params.miimon || + (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { + if (bond->params.updelay) { + dprintk("Initial state of slave_dev is " + "BOND_LINK_BACK\n"); + new_slave->link = BOND_LINK_BACK; + new_slave->delay = bond->params.updelay; + } else { + dprintk("Initial state of slave_dev is " + "BOND_LINK_UP\n"); + new_slave->link = BOND_LINK_UP; + } + new_slave->jiffies = jiffies; + } else { + dprintk("Initial state of slave_dev is " + "BOND_LINK_DOWN\n"); + new_slave->link = BOND_LINK_DOWN; + } + + if (bond_update_speed_duplex(new_slave) && + (new_slave->link != BOND_LINK_DOWN)) { + printk(KERN_WARNING DRV_NAME + ": Warning: failed to get speed and duplex from %s, " + "assumed to be 100Mb/sec and Full.\n", + new_slave->dev->name); + + if (bond->params.mode == BOND_MODE_8023AD) { + printk(KERN_WARNING + "Operation of 802.3ad mode requires ETHTOOL " + "support in base driver for proper aggregator " + "selection.\n"); + } + } + + if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { + /* if there is a primary slave, remember it */ + if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { + bond->primary_slave = new_slave; + } + } + + switch (bond->params.mode) { + case BOND_MODE_ACTIVEBACKUP: + /* if we're in active-backup mode, we need one and only one active + * interface. The backup interfaces will have their NOARP flag set + * because we need them to be completely deaf and not to respond to + * any ARP request on the network to avoid fooling a switch. Thus, + * since we guarantee that curr_active_slave always point to the last + * usable interface, we just have to verify this interface's flag. + */ + if (((!bond->curr_active_slave) || + (bond->curr_active_slave->dev->flags & IFF_NOARP)) && + (new_slave->link != BOND_LINK_DOWN)) { + dprintk("This is the first active slave\n"); + /* first slave or no active slave yet, and this link + is OK, so make this interface the active one */ + bond_change_active_slave(bond, new_slave); + } else { + dprintk("This is just a backup slave\n"); + bond_set_slave_inactive_flags(new_slave); + } + break; + case BOND_MODE_8023AD: + /* in 802.3ad mode, the internal mechanism + * will activate the slaves in the selected + * aggregator + */ + bond_set_slave_inactive_flags(new_slave); + /* if this is the first slave */ + if (bond->slave_cnt == 1) { + SLAVE_AD_INFO(new_slave).id = 1; + /* Initialize AD with the number of times that the AD timer is called in 1 second + * can be called only after the mac address of the bond is set + */ + bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL, + bond->params.lacp_fast); + } else { + SLAVE_AD_INFO(new_slave).id = + SLAVE_AD_INFO(new_slave->prev).id + 1; + } + + bond_3ad_bind_slave(new_slave); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + new_slave->state = BOND_STATE_ACTIVE; + if ((!bond->curr_active_slave) && + (new_slave->link != BOND_LINK_DOWN)) { + /* first slave or no active slave yet, and this link + * is OK, so make this interface the active one + */ + bond_change_active_slave(bond, new_slave); + } + break; + default: + dprintk("This slave is always active in trunk mode\n"); + + /* always active in trunk mode */ + new_slave->state = BOND_STATE_ACTIVE; + + /* In trunking mode there is little meaning to curr_active_slave + * anyway (it holds no special properties of the bond device), + * so we can change it without calling change_active_interface() + */ + if (!bond->curr_active_slave) { + bond->curr_active_slave = new_slave; + } + break; + } /* switch(bond_mode) */ + + write_unlock_bh(&bond->lock); + + if (app_abi_ver < 1) { + /* + * !!! This is to support old versions of ifenslave. + * We can remove this in 2.5 because our ifenslave takes + * care of this for us. + * We check to see if the master has a mac address yet. + * If not, we'll give it the mac address of our slave device. + */ + int ndx = 0; + + for (ndx = 0; ndx < bond_dev->addr_len; ndx++) { + dprintk("Checking ndx=%d of bond_dev->dev_addr\n", + ndx); + if (bond_dev->dev_addr[ndx] != 0) { + dprintk("Found non-zero byte at ndx=%d\n", + ndx); + break; + } + } + + if (ndx == bond_dev->addr_len) { + /* + * We got all the way through the address and it was + * all 0's. + */ + dprintk("%s doesn't have a MAC address yet. \n", + bond_dev->name); + dprintk("Going to give assign it from %s.\n", + slave_dev->name); + bond_sethwaddr(bond_dev, slave_dev); + } + } + + printk(KERN_INFO DRV_NAME + ": %s: enslaving %s as a%s interface with a%s link.\n", + bond_dev->name, slave_dev->name, + new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup", + new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); + + /* enslave is successful */ + return 0; + +/* Undo stages on error */ +err_unset_master: + netdev_set_master(slave_dev, NULL); + +err_close: + dev_close(slave_dev); + +err_restore_mac: + memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); + addr.sa_family = slave_dev->type; + dev_set_mac_address(slave_dev, &addr); + +err_free: + kfree(new_slave); + +err_undo_flags: + bond_dev->features = old_features; + + return res; +} + +/* + * Try to release the slave device <slave> from the bond device <master> + * It is legal to access curr_active_slave without a lock because all the function + * is write-locked. + * + * The rules for slave state should be: + * for Active/Backup: + * Active stays on all backups go down + * for Bonded connections: + * The first up interface should be left on and all others downed. + */ +static int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *oldcurrent; + struct sockaddr addr; + int mac_addr_differ; + + /* slave is not a slave or master is not master of this slave */ + if (!(slave_dev->flags & IFF_SLAVE) || + (slave_dev->master != bond_dev)) { + printk(KERN_ERR DRV_NAME + ": Error: %s: cannot release %s.\n", + bond_dev->name, slave_dev->name); + return -EINVAL; + } + + write_lock_bh(&bond->lock); + + slave = bond_get_slave_by_dev(bond, slave_dev); + if (!slave) { + /* not a slave of this bond */ + printk(KERN_INFO DRV_NAME + ": %s: %s not enslaved\n", + bond_dev->name, slave_dev->name); + return -EINVAL; + } + + mac_addr_differ = memcmp(bond_dev->dev_addr, + slave->perm_hwaddr, + ETH_ALEN); + if (!mac_addr_differ && (bond->slave_cnt > 1)) { + printk(KERN_WARNING DRV_NAME + ": Warning: the permanent HWaddr of %s " + "- %02X:%02X:%02X:%02X:%02X:%02X - is " + "still in use by %s. Set the HWaddr of " + "%s to a different address to avoid " + "conflicts.\n", + slave_dev->name, + slave->perm_hwaddr[0], + slave->perm_hwaddr[1], + slave->perm_hwaddr[2], + slave->perm_hwaddr[3], + slave->perm_hwaddr[4], + slave->perm_hwaddr[5], + bond_dev->name, + slave_dev->name); + } + + /* Inform AD package of unbinding of slave. */ + if (bond->params.mode == BOND_MODE_8023AD) { + /* must be called before the slave is + * detached from the list + */ + bond_3ad_unbind_slave(slave); + } + + printk(KERN_INFO DRV_NAME + ": %s: releasing %s interface %s\n", + bond_dev->name, + (slave->state == BOND_STATE_ACTIVE) + ? "active" : "backup", + slave_dev->name); + + oldcurrent = bond->curr_active_slave; + + bond->current_arp_slave = NULL; + + /* release the slave from its bond */ + bond_detach_slave(bond, slave); + + if (bond->primary_slave == slave) { + bond->primary_slave = NULL; + } + + if (oldcurrent == slave) { + bond_change_active_slave(bond, NULL); + } + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + /* Must be called only after the slave has been + * detached from the list and the curr_active_slave + * has been cleared (if our_slave == old_current), + * but before a new active slave is selected. + */ + bond_alb_deinit_slave(bond, slave); + } + + if (oldcurrent == slave) { + bond_select_active_slave(bond); + + if (!bond->curr_active_slave) { + printk(KERN_INFO DRV_NAME + ": %s: now running without any active " + "interface !\n", + bond_dev->name); + } + } + + if (bond->slave_cnt == 0) { + /* if the last slave was removed, zero the mac address + * of the master so it will be set by the application + * to the mac address of the first slave + */ + memset(bond_dev->dev_addr, 0, bond_dev->addr_len); + + if (list_empty(&bond->vlan_list)) { + bond_dev->features |= NETIF_F_VLAN_CHALLENGED; + } else { + printk(KERN_WARNING DRV_NAME + ": Warning: clearing HW address of %s while it " + "still has VLANs.\n", + bond_dev->name); + printk(KERN_WARNING DRV_NAME + ": When re-adding slaves, make sure the bond's " + "HW address matches its VLANs'.\n"); + } + } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) && + !bond_has_challenged_slaves(bond)) { + printk(KERN_INFO DRV_NAME + ": last VLAN challenged slave %s " + "left bond %s. VLAN blocking is removed\n", + slave_dev->name, bond_dev->name); + bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED; + } + + write_unlock_bh(&bond->lock); + + bond_del_vlans_from_slave(bond, slave_dev); + + /* If the mode USES_PRIMARY, then we should only remove its + * promisc and mc settings if it was the curr_active_slave, but that was + * already taken care of above when we detached the slave + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* unset promiscuity level from slave */ + if (bond_dev->flags & IFF_PROMISC) { + dev_set_promiscuity(slave_dev, -1); + } + + /* unset allmulti level from slave */ + if (bond_dev->flags & IFF_ALLMULTI) { + dev_set_allmulti(slave_dev, -1); + } + + /* flush master's mc_list from slave */ + bond_mc_list_flush(bond_dev, slave_dev); + } + + netdev_set_master(slave_dev, NULL); + + /* close slave before restoring its mac address */ + dev_close(slave_dev); + + if (app_abi_ver >= 1) { + /* 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); + } + + /* restore the original state of the + * IFF_NOARP flag that might have been + * set by bond_set_slave_inactive_flags() + */ + if ((slave->original_flags & IFF_NOARP) == 0) { + slave_dev->flags &= ~IFF_NOARP; + } + + kfree(slave); + + return 0; /* deletion OK */ +} + +/* + * This function releases all slaves. + */ +static int bond_release_all(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + struct net_device *slave_dev; + struct sockaddr addr; + + write_lock_bh(&bond->lock); + + if (bond->slave_cnt == 0) { + goto out; + } + + bond->current_arp_slave = NULL; + bond->primary_slave = NULL; + bond_change_active_slave(bond, NULL); + + while ((slave = bond->first_slave) != NULL) { + /* Inform AD package of unbinding of slave + * before slave is detached from the list. + */ + if (bond->params.mode == BOND_MODE_8023AD) { + bond_3ad_unbind_slave(slave); + } + + slave_dev = slave->dev; + bond_detach_slave(bond, slave); + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + /* must be called only after the slave + * has been detached from the list + */ + bond_alb_deinit_slave(bond, slave); + } + + /* now that the slave is detached, unlock and perform + * all the undo steps that should not be called from + * within a lock. + */ + write_unlock_bh(&bond->lock); + + bond_del_vlans_from_slave(bond, slave_dev); + + /* If the mode USES_PRIMARY, then we should only remove its + * promisc and mc settings if it was the curr_active_slave, but that was + * already taken care of above when we detached the slave + */ + if (!USES_PRIMARY(bond->params.mode)) { + /* unset promiscuity level from slave */ + if (bond_dev->flags & IFF_PROMISC) { + dev_set_promiscuity(slave_dev, -1); + } + + /* unset allmulti level from slave */ + if (bond_dev->flags & IFF_ALLMULTI) { + dev_set_allmulti(slave_dev, -1); + } + + /* flush master's mc_list from slave */ + bond_mc_list_flush(bond_dev, slave_dev); + } + + netdev_set_master(slave_dev, NULL); + + /* close slave before restoring its mac address */ + dev_close(slave_dev); + + if (app_abi_ver >= 1) { + /* 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); + } + + /* restore the original state of the IFF_NOARP flag that might have + * been set by bond_set_slave_inactive_flags() + */ + if ((slave->original_flags & IFF_NOARP) == 0) { + slave_dev->flags &= ~IFF_NOARP; + } + + kfree(slave); + + /* re-acquire the lock before getting the next slave */ + write_lock_bh(&bond->lock); + } + + /* zero the mac address of the master so it will be + * set by the application to the mac address of the + * first slave + */ + memset(bond_dev->dev_addr, 0, bond_dev->addr_len); + + if (list_empty(&bond->vlan_list)) { + bond_dev->features |= NETIF_F_VLAN_CHALLENGED; + } else { + printk(KERN_WARNING DRV_NAME + ": Warning: clearing HW address of %s while it " + "still has VLANs.\n", + bond_dev->name); + printk(KERN_WARNING DRV_NAME + ": When re-adding slaves, make sure the bond's " + "HW address matches its VLANs'.\n"); + } + + printk(KERN_INFO DRV_NAME + ": %s: released all slaves\n", + bond_dev->name); + +out: + write_unlock_bh(&bond->lock); + + return 0; +} + +/* + * This function changes the active slave to slave <slave_dev>. + * It returns -EINVAL in the following cases. + * - <slave_dev> is not found in the list. + * - There is not active slave now. + * - <slave_dev> is already active. + * - The link state of <slave_dev> is not BOND_LINK_UP. + * - <slave_dev> is not running. + * In these cases, this fuction does nothing. + * In the other cases, currnt_slave pointer is changed and 0 is returned. + */ +static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *old_active = NULL; + struct slave *new_active = NULL; + int res = 0; + + if (!USES_PRIMARY(bond->params.mode)) { + return -EINVAL; + } + + /* Verify that master_dev is indeed the master of slave_dev */ + if (!(slave_dev->flags & IFF_SLAVE) || + (slave_dev->master != bond_dev)) { + return -EINVAL; + } + + write_lock_bh(&bond->lock); + + old_active = bond->curr_active_slave; + new_active = bond_get_slave_by_dev(bond, slave_dev); + + /* + * Changing to the current active: do nothing; return success. + */ + if (new_active && (new_active == old_active)) { + write_unlock_bh(&bond->lock); + return 0; + } + + if ((new_active) && + (old_active) && + (new_active->link == BOND_LINK_UP) && + IS_UP(new_active->dev)) { + bond_change_active_slave(bond, new_active); + } else { + res = -EINVAL; + } + + write_unlock_bh(&bond->lock); + + return res; +} + +static int bond_ethtool_ioctl(struct net_device *bond_dev, struct ifreq *ifr) +{ + struct ethtool_drvinfo info; + void __user *addr = ifr->ifr_data; + uint32_t cmd; + + if (get_user(cmd, (uint32_t __user *)addr)) { + return -EFAULT; + } + + switch (cmd) { + case ETHTOOL_GDRVINFO: + if (copy_from_user(&info, addr, sizeof(info))) { + return -EFAULT; + } + + if (strcmp(info.driver, "ifenslave") == 0) { + int new_abi_ver; + char *endptr; + + new_abi_ver = simple_strtoul(info.fw_version, + &endptr, 0); + if (*endptr) { + printk(KERN_ERR DRV_NAME + ": Error: got invalid ABI " + "version from application\n"); + + return -EINVAL; + } + + if (orig_app_abi_ver == -1) { + orig_app_abi_ver = new_abi_ver; + } + + app_abi_ver = new_abi_ver; + } + + strncpy(info.driver, DRV_NAME, 32); + strncpy(info.version, DRV_VERSION, 32); + snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION); + + if (copy_to_user(addr, &info, sizeof(info))) { + return -EFAULT; + } + + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) +{ + struct bonding *bond = bond_dev->priv; + + info->bond_mode = bond->params.mode; + info->miimon = bond->params.miimon; + + read_lock_bh(&bond->lock); + info->num_slaves = bond->slave_cnt; + read_unlock_bh(&bond->lock); + + return 0; +} + +static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + int i, found = 0; + + if (info->slave_id < 0) { + return -ENODEV; + } + + read_lock_bh(&bond->lock); + + bond_for_each_slave(bond, slave, i) { + if (i == (int)info->slave_id) { + found = 1; + break; + } + } + + read_unlock_bh(&bond->lock); + + if (found) { + strcpy(info->slave_name, slave->dev->name); + info->link = slave->link; + info->state = slave->state; + info->link_failure_count = slave->link_failure_count; + } else { + return -ENODEV; + } + + return 0; +} + +/*-------------------------------- Monitoring -------------------------------*/ + +/* this function is called regularly to monitor each slave's link. */ +static void bond_mii_monitor(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *oldcurrent; + int do_failover = 0; + int delta_in_ticks; + int i; + + read_lock(&bond->lock); + + delta_in_ticks = (bond->params.miimon * HZ) / 1000; + + if (bond->kill_timers) { + goto out; + } + + if (bond->slave_cnt == 0) { + goto re_arm; + } + + /* we will try to read the link status of each of our slaves, and + * set their IFF_RUNNING flag appropriately. For each slave not + * supporting MII status, we won't do anything so that a user-space + * program could monitor the link itself if needed. + */ + + read_lock(&bond->curr_slave_lock); + oldcurrent = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + bond_for_each_slave(bond, slave, i) { + struct net_device *slave_dev = slave->dev; + int link_state; + u16 old_speed = slave->speed; + u8 old_duplex = slave->duplex; + + link_state = bond_check_dev_link(bond, slave_dev, 0); + + switch (slave->link) { + case BOND_LINK_UP: /* the link was up */ + if (link_state == BMSR_LSTATUS) { + /* link stays up, nothing more to do */ + break; + } else { /* link going down */ + slave->link = BOND_LINK_FAIL; + slave->delay = bond->params.downdelay; + + if (slave->link_failure_count < UINT_MAX) { + slave->link_failure_count++; + } + + if (bond->params.downdelay) { + printk(KERN_INFO DRV_NAME + ": %s: link status down for %s " + "interface %s, disabling it in " + "%d ms.\n", + bond_dev->name, + IS_UP(slave_dev) + ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) + ? ((slave == oldcurrent) + ? "active " : "backup ") + : "") + : "idle ", + slave_dev->name, + bond->params.downdelay * bond->params.miimon); + } + } + /* no break ! fall through the BOND_LINK_FAIL test to + ensure proper action to be taken + */ + case BOND_LINK_FAIL: /* the link has just gone down */ + if (link_state != BMSR_LSTATUS) { + /* link stays down */ + if (slave->delay <= 0) { + /* link down for too long time */ + slave->link = BOND_LINK_DOWN; + + /* in active/backup mode, we must + * completely disable this interface + */ + if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) || + (bond->params.mode == BOND_MODE_8023AD)) { + bond_set_slave_inactive_flags(slave); + } + + printk(KERN_INFO DRV_NAME + ": %s: link status definitely " + "down for interface %s, " + "disabling it\n", + bond_dev->name, + slave_dev->name); + + /* notify ad that the link status has changed */ + if (bond->params.mode == BOND_MODE_8023AD) { + bond_3ad_handle_link_change(slave, BOND_LINK_DOWN); + } + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN); + } + + if (slave == oldcurrent) { + do_failover = 1; + } + } else { + slave->delay--; + } + } else { + /* link up again */ + slave->link = BOND_LINK_UP; + slave->jiffies = jiffies; + printk(KERN_INFO DRV_NAME + ": %s: link status up again after %d " + "ms for interface %s.\n", + bond_dev->name, + (bond->params.downdelay - slave->delay) * bond->params.miimon, + slave_dev->name); + } + break; + case BOND_LINK_DOWN: /* the link was down */ + if (link_state != BMSR_LSTATUS) { + /* the link stays down, nothing more to do */ + break; + } else { /* link going up */ + slave->link = BOND_LINK_BACK; + slave->delay = bond->params.updelay; + + if (bond->params.updelay) { + /* if updelay == 0, no need to + advertise about a 0 ms delay */ + printk(KERN_INFO DRV_NAME + ": %s: link status up for " + "interface %s, enabling it " + "in %d ms.\n", + bond_dev->name, + slave_dev->name, + bond->params.updelay * bond->params.miimon); + } + } + /* no break ! fall through the BOND_LINK_BACK state in + case there's something to do. + */ + case BOND_LINK_BACK: /* the link has just come back */ + if (link_state != BMSR_LSTATUS) { + /* link down again */ + slave->link = BOND_LINK_DOWN; + + printk(KERN_INFO DRV_NAME + ": %s: link status down again after %d " + "ms for interface %s.\n", + bond_dev->name, + (bond->params.updelay - slave->delay) * bond->params.miimon, + slave_dev->name); + } else { + /* link stays up */ + if (slave->delay == 0) { + /* now the link has been up for long time enough */ + slave->link = BOND_LINK_UP; + slave->jiffies = jiffies; + + if (bond->params.mode == BOND_MODE_8023AD) { + /* prevent it from being the active one */ + slave->state = BOND_STATE_BACKUP; + } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { + /* make it immediately active */ + slave->state = BOND_STATE_ACTIVE; + } else if (slave != bond->primary_slave) { + /* prevent it from being the active one */ + slave->state = BOND_STATE_BACKUP; + } + + printk(KERN_INFO DRV_NAME + ": %s: link status definitely " + "up for interface %s.\n", + bond_dev->name, + slave_dev->name); + + /* notify ad that the link status has changed */ + if (bond->params.mode == BOND_MODE_8023AD) { + bond_3ad_handle_link_change(slave, BOND_LINK_UP); + } + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + bond_alb_handle_link_change(bond, slave, BOND_LINK_UP); + } + + if ((!oldcurrent) || + (slave == bond->primary_slave)) { + do_failover = 1; + } + } else { + slave->delay--; + } + } + break; + default: + /* Should not happen */ + printk(KERN_ERR "bonding: Error: %s Illegal value (link=%d)\n", + slave->dev->name, slave->link); + goto out; + } /* end of switch (slave->link) */ + + bond_update_speed_duplex(slave); + + if (bond->params.mode == BOND_MODE_8023AD) { + if (old_speed != slave->speed) { + bond_3ad_adapter_speed_changed(slave); + } + + if (old_duplex != slave->duplex) { + bond_3ad_adapter_duplex_changed(slave); + } + } + + } /* end of for */ + + if (do_failover) { + write_lock(&bond->curr_slave_lock); + + bond_select_active_slave(bond); + + if (oldcurrent && !bond->curr_active_slave) { + printk(KERN_INFO DRV_NAME + ": %s: now running without any active " + "interface !\n", + bond_dev->name); + } + + write_unlock(&bond->curr_slave_lock); + } + +re_arm: + if (bond->params.miimon) { + mod_timer(&bond->mii_timer, jiffies + delta_in_ticks); + } +out: + read_unlock(&bond->lock); +} + +static void bond_arp_send_all(struct bonding *bond, struct slave *slave) +{ + int i; + u32 *targets = bond->params.arp_targets; + + for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { + arp_send(ARPOP_REQUEST, ETH_P_ARP, targets[i], slave->dev, + my_ip, NULL, slave->dev->dev_addr, + NULL); + } +} + +/* + * this function is called regularly to monitor each slave's link + * ensuring that traffic is being sent and received when arp monitoring + * is used in load-balancing mode. if the adapter has been dormant, then an + * arp is transmitted to generate traffic. see activebackup_arp_monitor for + * arp monitoring in active backup mode. + */ +static void bond_loadbalance_arp_mon(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *oldcurrent; + int do_failover = 0; + int delta_in_ticks; + int i; + + read_lock(&bond->lock); + + delta_in_ticks = (bond->params.arp_interval * HZ) / 1000; + + if (bond->kill_timers) { + goto out; + } + + if (bond->slave_cnt == 0) { + goto re_arm; + } + + read_lock(&bond->curr_slave_lock); + oldcurrent = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + /* see if any of the previous devices are up now (i.e. they have + * xmt and rcv traffic). the curr_active_slave does not come into + * the picture unless it is null. also, slave->jiffies is not needed + * here because we send an arp on each slave and give a slave as + * long as it needs to get the tx/rx within the delta. + * TODO: what about up/down delay in arp mode? it wasn't here before + * so it can wait + */ + bond_for_each_slave(bond, slave, i) { + if (slave->link != BOND_LINK_UP) { + if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) && + ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) { + + slave->link = BOND_LINK_UP; + slave->state = BOND_STATE_ACTIVE; + + /* primary_slave has no meaning in round-robin + * mode. the window of a slave being up and + * curr_active_slave being null after enslaving + * is closed. + */ + if (!oldcurrent) { + printk(KERN_INFO DRV_NAME + ": %s: link status definitely " + "up for interface %s, ", + bond_dev->name, + slave->dev->name); + do_failover = 1; + } else { + printk(KERN_INFO DRV_NAME + ": %s: interface %s is now up\n", + bond_dev->name, + slave->dev->name); + } + } + } else { + /* slave->link == BOND_LINK_UP */ + + /* not all switches will respond to an arp request + * when the source ip is 0, so don't take the link down + * if we don't know our ip yet + */ + if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) || + (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) && + my_ip)) { + + slave->link = BOND_LINK_DOWN; + slave->state = BOND_STATE_BACKUP; + + if (slave->link_failure_count < UINT_MAX) { + slave->link_failure_count++; + } + + printk(KERN_INFO DRV_NAME + ": %s: interface %s is now down.\n", + bond_dev->name, + slave->dev->name); + + if (slave == oldcurrent) { + do_failover = 1; + } + } + } + + /* note: if switch is in round-robin mode, all links + * must tx arp to ensure all links rx an arp - otherwise + * links may oscillate or not come up at all; if switch is + * in something like xor mode, there is nothing we can + * do - all replies will be rx'ed on same link causing slaves + * to be unstable during low/no traffic periods + */ + if (IS_UP(slave->dev)) { + bond_arp_send_all(bond, slave); + } + } + + if (do_failover) { + write_lock(&bond->curr_slave_lock); + + bond_select_active_slave(bond); + + if (oldcurrent && !bond->curr_active_slave) { + printk(KERN_INFO DRV_NAME + ": %s: now running without any active " + "interface !\n", + bond_dev->name); + } + + write_unlock(&bond->curr_slave_lock); + } + +re_arm: + if (bond->params.arp_interval) { + mod_timer(&bond->arp_timer, jiffies + delta_in_ticks); + } +out: + read_unlock(&bond->lock); +} + +/* + * When using arp monitoring in active-backup mode, this function is + * called to determine if any backup slaves have went down or a new + * current slave needs to be found. + * The backup slaves never generate traffic, they are considered up by merely + * receiving traffic. If the current slave goes down, each backup slave will + * be given the opportunity to tx/rx an arp before being taken down - this + * prevents all slaves from being taken down due to the current slave not + * sending any traffic for the backups to receive. The arps are not necessarily + * necessary, any tx and rx traffic will keep the current slave up. While any + * rx traffic will keep the backup slaves up, the current slave is responsible + * for generating traffic to keep them up regardless of any other traffic they + * may have received. + * see loadbalance_arp_monitor for arp monitoring in load balancing mode + */ +static void bond_activebackup_arp_mon(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave; + int delta_in_ticks; + int i; + + read_lock(&bond->lock); + + delta_in_ticks = (bond->params.arp_interval * HZ) / 1000; + + if (bond->kill_timers) { + goto out; + } + + if (bond->slave_cnt == 0) { + goto re_arm; + } + + /* determine if any slave has come up or any backup slave has + * gone down + * TODO: what about up/down delay in arp mode? it wasn't here before + * so it can wait + */ + bond_for_each_slave(bond, slave, i) { + if (slave->link != BOND_LINK_UP) { + if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) { + + slave->link = BOND_LINK_UP; + + write_lock(&bond->curr_slave_lock); + + if ((!bond->curr_active_slave) && + ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) { + bond_change_active_slave(bond, slave); + bond->current_arp_slave = NULL; + } else if (bond->curr_active_slave != slave) { + /* this slave has just come up but we + * already have a current slave; this + * can also happen if bond_enslave adds + * a new slave that is up while we are + * searching for a new slave + */ + bond_set_slave_inactive_flags(slave); + bond->current_arp_slave = NULL; + } + + if (slave == bond->curr_active_slave) { + printk(KERN_INFO DRV_NAME + ": %s: %s is up and now the " + "active interface\n", + bond_dev->name, + slave->dev->name); + } else { + printk(KERN_INFO DRV_NAME + ": %s: backup interface %s is " + "now up\n", + bond_dev->name, + slave->dev->name); + } + + write_unlock(&bond->curr_slave_lock); + } + } else { + read_lock(&bond->curr_slave_lock); + + if ((slave != bond->curr_active_slave) && + (!bond->current_arp_slave) && + (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) && + my_ip)) { + /* a backup slave has gone down; three times + * the delta allows the current slave to be + * taken out before the backup slave. + * note: a non-null current_arp_slave indicates + * the curr_active_slave went down and we are + * searching for a new one; under this + * condition we only take the curr_active_slave + * down - this gives each slave a chance to + * tx/rx traffic before being taken out + */ + + read_unlock(&bond->curr_slave_lock); + + slave->link = BOND_LINK_DOWN; + + if (slave->link_failure_count < UINT_MAX) { + slave->link_failure_count++; + } + + bond_set_slave_inactive_flags(slave); + + printk(KERN_INFO DRV_NAME + ": %s: backup interface %s is now down\n", + bond_dev->name, + slave->dev->name); + } else { + read_unlock(&bond->curr_slave_lock); + } + } + } + + read_lock(&bond->curr_slave_lock); + slave = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + if (slave) { + /* if we have sent traffic in the past 2*arp_intervals but + * haven't xmit and rx traffic in that time interval, select + * a different slave. slave->jiffies is only updated when + * a slave first becomes the curr_active_slave - not necessarily + * after every arp; this ensures the slave has a full 2*delta + * before being taken out. if a primary is being used, check + * if it is up and needs to take over as the curr_active_slave + */ + if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) || + (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) && + my_ip)) && + ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) { + + slave->link = BOND_LINK_DOWN; + + if (slave->link_failure_count < UINT_MAX) { + slave->link_failure_count++; + } + + printk(KERN_INFO DRV_NAME + ": %s: link status down for active interface " + "%s, disabling it\n", + bond_dev->name, + slave->dev->name); + + write_lock(&bond->curr_slave_lock); + + bond_select_active_slave(bond); + slave = bond->curr_active_slave; + + write_unlock(&bond->curr_slave_lock); + + bond->current_arp_slave = slave; + + if (slave) { + slave->jiffies = jiffies; + } + } else if ((bond->primary_slave) && + (bond->primary_slave != slave) && + (bond->primary_slave->link == BOND_LINK_UP)) { + /* at this point, slave is the curr_active_slave */ + printk(KERN_INFO DRV_NAME + ": %s: changing from interface %s to primary " + "interface %s\n", + bond_dev->name, + slave->dev->name, + bond->primary_slave->dev->name); + + /* primary is up so switch to it */ + write_lock(&bond->curr_slave_lock); + bond_change_active_slave(bond, bond->primary_slave); + write_unlock(&bond->curr_slave_lock); + + slave = bond->primary_slave; + slave->jiffies = jiffies; + } else { + bond->current_arp_slave = NULL; + } + + /* the current slave must tx an arp to ensure backup slaves + * rx traffic + */ + if (slave && my_ip) { + bond_arp_send_all(bond, slave); + } + } + + /* if we don't have a curr_active_slave, search for the next available + * backup slave from the current_arp_slave and make it the candidate + * for becoming the curr_active_slave + */ + if (!slave) { + if (!bond->current_arp_slave) { + bond->current_arp_slave = bond->first_slave; + } + + if (bond->current_arp_slave) { + bond_set_slave_inactive_flags(bond->current_arp_slave); + + /* search for next candidate */ + bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave) { + if (IS_UP(slave->dev)) { + slave->link = BOND_LINK_BACK; + bond_set_slave_active_flags(slave); + bond_arp_send_all(bond, slave); + slave->jiffies = jiffies; + bond->current_arp_slave = slave; + break; + } + + /* if the link state is up at this point, we + * mark it down - this can happen if we have + * simultaneous link failures and + * reselect_active_interface doesn't make this + * one the current slave so it is still marked + * up when it is actually down + */ + if (slave->link == BOND_LINK_UP) { + slave->link = BOND_LINK_DOWN; + if (slave->link_failure_count < UINT_MAX) { + slave->link_failure_count++; + } + + bond_set_slave_inactive_flags(slave); + + printk(KERN_INFO DRV_NAME + ": %s: backup interface %s is " + "now down.\n", + bond_dev->name, + slave->dev->name); + } + } + } + } + +re_arm: + if (bond->params.arp_interval) { + mod_timer(&bond->arp_timer, jiffies + delta_in_ticks); + } +out: + read_unlock(&bond->lock); +} + +/*------------------------------ proc/seq_file-------------------------------*/ + +#ifdef CONFIG_PROC_FS + +#define SEQ_START_TOKEN ((void *)1) + +static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct bonding *bond = seq->private; + loff_t off = 0; + struct slave *slave; + int i; + + /* make sure the bond won't be taken away */ + read_lock(&dev_base_lock); + read_lock_bh(&bond->lock); + + if (*pos == 0) { + return SEQ_START_TOKEN; + } + + bond_for_each_slave(bond, slave, i) { + if (++off == *pos) { + return slave; + } + } + + return NULL; +} + +static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct bonding *bond = seq->private; + struct slave *slave = v; + + ++*pos; + if (v == SEQ_START_TOKEN) { + return bond->first_slave; + } + + slave = slave->next; + + return (slave == bond->first_slave) ? NULL : slave; +} + +static void bond_info_seq_stop(struct seq_file *seq, void *v) +{ + struct bonding *bond = seq->private; + + read_unlock_bh(&bond->lock); + read_unlock(&dev_base_lock); +} + +static void bond_info_show_master(struct seq_file *seq) +{ + struct bonding *bond = seq->private; + struct slave *curr; + + read_lock(&bond->curr_slave_lock); + curr = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + seq_printf(seq, "Bonding Mode: %s\n", + bond_mode_name(bond->params.mode)); + + if (USES_PRIMARY(bond->params.mode)) { + seq_printf(seq, "Primary Slave: %s\n", + (bond->params.primary[0]) ? + bond->params.primary : "None"); + + seq_printf(seq, "Currently Active Slave: %s\n", + (curr) ? curr->dev->name : "None"); + } + + seq_printf(seq, "MII Status: %s\n", (curr) ? "up" : "down"); + seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon); + seq_printf(seq, "Up Delay (ms): %d\n", + bond->params.updelay * bond->params.miimon); + seq_printf(seq, "Down Delay (ms): %d\n", + bond->params.downdelay * bond->params.miimon); + + if (bond->params.mode == BOND_MODE_8023AD) { + struct ad_info ad_info; + + seq_puts(seq, "\n802.3ad info\n"); + seq_printf(seq, "LACP rate: %s\n", + (bond->params.lacp_fast) ? "fast" : "slow"); + + if (bond_3ad_get_active_agg_info(bond, &ad_info)) { + seq_printf(seq, "bond %s has no active aggregator\n", + bond->dev->name); + } else { + seq_printf(seq, "Active Aggregator Info:\n"); + + seq_printf(seq, "\tAggregator ID: %d\n", + ad_info.aggregator_id); + seq_printf(seq, "\tNumber of ports: %d\n", + ad_info.ports); + seq_printf(seq, "\tActor Key: %d\n", + ad_info.actor_key); + seq_printf(seq, "\tPartner Key: %d\n", + ad_info.partner_key); + seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n", + ad_info.partner_system[0], + ad_info.partner_system[1], + ad_info.partner_system[2], + ad_info.partner_system[3], + ad_info.partner_system[4], + ad_info.partner_system[5]); + } + } +} + +static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave) +{ + struct bonding *bond = seq->private; + + seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name); + seq_printf(seq, "MII Status: %s\n", + (slave->link == BOND_LINK_UP) ? "up" : "down"); + seq_printf(seq, "Link Failure Count: %d\n", + slave->link_failure_count); + + if (app_abi_ver >= 1) { + seq_printf(seq, + "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n", + slave->perm_hwaddr[0], + slave->perm_hwaddr[1], + slave->perm_hwaddr[2], + slave->perm_hwaddr[3], + slave->perm_hwaddr[4], + slave->perm_hwaddr[5]); + } + + if (bond->params.mode == BOND_MODE_8023AD) { + const struct aggregator *agg + = SLAVE_AD_INFO(slave).port.aggregator; + + if (agg) { + seq_printf(seq, "Aggregator ID: %d\n", + agg->aggregator_identifier); + } else { + seq_puts(seq, "Aggregator ID: N/A\n"); + } + } +} + +static int bond_info_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) { + seq_printf(seq, "%s\n", version); + bond_info_show_master(seq); + } else { + bond_info_show_slave(seq, v); + } + + return 0; +} + +static struct seq_operations bond_info_seq_ops = { + .start = bond_info_seq_start, + .next = bond_info_seq_next, + .stop = bond_info_seq_stop, + .show = bond_info_seq_show, +}; + +static int bond_info_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + struct proc_dir_entry *proc; + int res; + + res = seq_open(file, &bond_info_seq_ops); + if (!res) { + /* recover the pointer buried in proc_dir_entry data */ + seq = file->private_data; + proc = PDE(inode); + seq->private = proc->data; + } + + return res; +} + +static struct file_operations bond_info_fops = { + .owner = THIS_MODULE, + .open = bond_info_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int bond_create_proc_entry(struct bonding *bond) +{ + struct net_device *bond_dev = bond->dev; + + if (bond_proc_dir) { + bond->proc_entry = create_proc_entry(bond_dev->name, + S_IRUGO, + bond_proc_dir); + if (bond->proc_entry == NULL) { + printk(KERN_WARNING DRV_NAME + ": Warning: Cannot create /proc/net/%s/%s\n", + DRV_NAME, bond_dev->name); + } else { + bond->proc_entry->data = bond; + bond->proc_entry->proc_fops = &bond_info_fops; + bond->proc_entry->owner = THIS_MODULE; + memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ); + } + } + + return 0; +} + +static void bond_remove_proc_entry(struct bonding *bond) +{ + if (bond_proc_dir && bond->proc_entry) { + remove_proc_entry(bond->proc_file_name, bond_proc_dir); + memset(bond->proc_file_name, 0, IFNAMSIZ); + bond->proc_entry = NULL; + } +} + +/* Create the bonding directory under /proc/net, if doesn't exist yet. + * Caller must hold rtnl_lock. + */ +static void bond_create_proc_dir(void) +{ + int len = strlen(DRV_NAME); + + for (bond_proc_dir = proc_net->subdir; bond_proc_dir; + bond_proc_dir = bond_proc_dir->next) { + if ((bond_proc_dir->namelen == len) && + !memcmp(bond_proc_dir->name, DRV_NAME, len)) { + break; + } + } + + if (!bond_proc_dir) { + bond_proc_dir = proc_mkdir(DRV_NAME, proc_net); + if (bond_proc_dir) { + bond_proc_dir->owner = THIS_MODULE; + } else { + printk(KERN_WARNING DRV_NAME + ": Warning: cannot create /proc/net/%s\n", + DRV_NAME); + } + } +} + +/* Destroy the bonding directory under /proc/net, if empty. + * Caller must hold rtnl_lock. + */ +static void bond_destroy_proc_dir(void) +{ + struct proc_dir_entry *de; + + if (!bond_proc_dir) { + return; + } + + /* verify that the /proc dir is empty */ + for (de = bond_proc_dir->subdir; de; de = de->next) { + /* ignore . and .. */ + if (*(de->name) != '.') { + break; + } + } + + if (de) { + if (bond_proc_dir->owner == THIS_MODULE) { + bond_proc_dir->owner = NULL; + } + } else { + remove_proc_entry(DRV_NAME, proc_net); + bond_proc_dir = NULL; + } +} +#endif /* CONFIG_PROC_FS */ + +/*-------------------------- netdev event handling --------------------------*/ + +/* + * Change device name + */ +static int bond_event_changename(struct bonding *bond) +{ +#ifdef CONFIG_PROC_FS + bond_remove_proc_entry(bond); + bond_create_proc_entry(bond); +#endif + + return NOTIFY_DONE; +} + +static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev) +{ + struct bonding *event_bond = bond_dev->priv; + + switch (event) { + case NETDEV_CHANGENAME: + return bond_event_changename(event_bond); + case NETDEV_UNREGISTER: + /* + * TODO: remove a bond from the list? + */ + break; + default: + break; + } + + return NOTIFY_DONE; +} + +static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev) +{ + struct net_device *bond_dev = slave_dev->master; + + switch (event) { + case NETDEV_UNREGISTER: + if (bond_dev) { + bond_release(bond_dev, slave_dev); + } + break; + case NETDEV_CHANGE: + /* + * TODO: is this what we get if somebody + * sets up a hierarchical bond, then rmmod's + * one of the slave bonding devices? + */ + break; + case NETDEV_DOWN: + /* + * ... Or is it this? + */ + break; + case NETDEV_CHANGEMTU: + /* + * TODO: Should slaves be allowed to + * independently alter their MTU? For + * an active-backup bond, slaves need + * not be the same type of device, so + * MTUs may vary. For other modes, + * slaves arguably should have the + * same MTUs. To do this, we'd need to + * take over the slave's change_mtu + * function for the duration of their + * servitude. + */ + break; + case NETDEV_CHANGENAME: + /* + * TODO: handle changing the primary's name + */ + break; + 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 notifier_call_chain) holds the necessary + * locks for us to safely manipulate the slave devices (RTNL lock, + * dev_probe_lock). + */ +static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct net_device *event_dev = (struct net_device *)ptr; + + dprintk("event_dev: %s, event: %lx\n", + (event_dev ? event_dev->name : "None"), + event); + + if (event_dev->flags & IFF_MASTER) { + dprintk("IFF_MASTER\n"); + return bond_master_netdev_event(event, event_dev); + } + + if (event_dev->flags & IFF_SLAVE) { + dprintk("IFF_SLAVE\n"); + return bond_slave_netdev_event(event, event_dev); + } + + return NOTIFY_DONE; +} + +static struct notifier_block bond_netdev_notifier = { + .notifier_call = bond_netdev_event, +}; + +/*-------------------------- Packet type handling ---------------------------*/ + +/* register to receive lacpdus on a bond */ +static void bond_register_lacpdu(struct bonding *bond) +{ + struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type); + + /* initialize packet type */ + pk_type->type = PKT_TYPE_LACPDU; + pk_type->dev = bond->dev; + pk_type->func = bond_3ad_lacpdu_recv; + + dev_add_pack(pk_type); +} + +/* unregister to receive lacpdus on a bond */ +static void bond_unregister_lacpdu(struct bonding *bond) +{ + dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type)); +} + +/*-------------------------- Device entry points ----------------------------*/ + +static int bond_open(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct timer_list *mii_timer = &bond->mii_timer; + struct timer_list *arp_timer = &bond->arp_timer; + + bond->kill_timers = 0; + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer); + + /* bond_alb_initialize must be called before the timer + * is started. + */ + if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { + /* something went wrong - fail the open operation */ + return -1; + } + + init_timer(alb_timer); + alb_timer->expires = jiffies + 1; + alb_timer->data = (unsigned long)bond; + alb_timer->function = (void *)&bond_alb_monitor; + add_timer(alb_timer); + } + + if (bond->params.miimon) { /* link check interval, in milliseconds. */ + init_timer(mii_timer); + mii_timer->expires = jiffies + 1; + mii_timer->data = (unsigned long)bond_dev; + mii_timer->function = (void *)&bond_mii_monitor; + add_timer(mii_timer); + } + + if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ + init_timer(arp_timer); + arp_timer->expires = jiffies + 1; + arp_timer->data = (unsigned long)bond_dev; + if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { + arp_timer->function = (void *)&bond_activebackup_arp_mon; + } else { + arp_timer->function = (void *)&bond_loadbalance_arp_mon; + } + add_timer(arp_timer); + } + + if (bond->params.mode == BOND_MODE_8023AD) { + struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer); + init_timer(ad_timer); + ad_timer->expires = jiffies + 1; + ad_timer->data = (unsigned long)bond; + ad_timer->function = (void *)&bond_3ad_state_machine_handler; + add_timer(ad_timer); + + /* register to receive LACPDUs */ + bond_register_lacpdu(bond); + } + + return 0; +} + +static int bond_close(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + + if (bond->params.mode == BOND_MODE_8023AD) { + /* Unregister the receive of LACPDUs */ + bond_unregister_lacpdu(bond); + } + + write_lock_bh(&bond->lock); + + bond_mc_list_destroy(bond); + + /* signal timers not to re-arm */ + bond->kill_timers = 1; + + write_unlock_bh(&bond->lock); + + /* del_timer_sync must run without holding the bond->lock + * because a running timer might be trying to hold it too + */ + + if (bond->params.miimon) { /* link check interval, in milliseconds. */ + del_timer_sync(&bond->mii_timer); + } + + if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ + del_timer_sync(&bond->arp_timer); + } + + switch (bond->params.mode) { + case BOND_MODE_8023AD: + del_timer_sync(&(BOND_AD_INFO(bond).ad_timer)); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer)); + break; + default: + break; + } + + /* Release the bonded slaves */ + bond_release_all(bond_dev); + + if ((bond->params.mode == BOND_MODE_TLB) || + (bond->params.mode == BOND_MODE_ALB)) { + /* Must be called only after all + * slaves have been released + */ + bond_alb_deinitialize(bond); + } + + return 0; +} + +static struct net_device_stats *bond_get_stats(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct net_device_stats *stats = &(bond->stats), *sstats; + struct slave *slave; + int i; + + memset(stats, 0, sizeof(struct net_device_stats)); + + read_lock_bh(&bond->lock); + + bond_for_each_slave(bond, slave, i) { + sstats = slave->dev->get_stats(slave->dev); + + stats->rx_packets += sstats->rx_packets; + stats->rx_bytes += sstats->rx_bytes; + stats->rx_errors += sstats->rx_errors; + stats->rx_dropped += sstats->rx_dropped; + + stats->tx_packets += sstats->tx_packets; + stats->tx_bytes += sstats->tx_bytes; + stats->tx_errors += sstats->tx_errors; + stats->tx_dropped += sstats->tx_dropped; + + stats->multicast += sstats->multicast; + stats->collisions += sstats->collisions; + + stats->rx_length_errors += sstats->rx_length_errors; + stats->rx_over_errors += sstats->rx_over_errors; + stats->rx_crc_errors += sstats->rx_crc_errors; + stats->rx_frame_errors += sstats->rx_frame_errors; + stats->rx_fifo_errors += sstats->rx_fifo_errors; + stats->rx_missed_errors += sstats->rx_missed_errors; + + stats->tx_aborted_errors += sstats->tx_aborted_errors; + stats->tx_carrier_errors += sstats->tx_carrier_errors; + stats->tx_fifo_errors += sstats->tx_fifo_errors; + stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; + stats->tx_window_errors += sstats->tx_window_errors; + } + + read_unlock_bh(&bond->lock); + + return stats; +} + +static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) +{ + struct net_device *slave_dev = NULL; + struct ifbond k_binfo; + struct ifbond __user *u_binfo = NULL; + struct ifslave k_sinfo; + struct ifslave __user *u_sinfo = NULL; + struct mii_ioctl_data *mii = NULL; + int prev_abi_ver = orig_app_abi_ver; + int res = 0; + + dprintk("bond_ioctl: master=%s, cmd=%d\n", + bond_dev->name, cmd); + + switch (cmd) { + case SIOCETHTOOL: + return bond_ethtool_ioctl(bond_dev, ifr); + case SIOCGMIIPHY: + mii = if_mii(ifr); + if (!mii) { + return -EINVAL; + } + mii->phy_id = 0; + /* Fall Through */ + case SIOCGMIIREG: + /* + * We do this again just in case we were called by SIOCGMIIREG + * instead of SIOCGMIIPHY. + */ + mii = if_mii(ifr); + if (!mii) { + return -EINVAL; + } + + if (mii->reg_num == 1) { + struct bonding *bond = bond_dev->priv; + mii->val_out = 0; + read_lock_bh(&bond->lock); + read_lock(&bond->curr_slave_lock); + if (bond->curr_active_slave) { + mii->val_out = BMSR_LSTATUS; + } + read_unlock(&bond->curr_slave_lock); + read_unlock_bh(&bond->lock); + } + + return 0; + case BOND_INFO_QUERY_OLD: + case SIOCBONDINFOQUERY: + u_binfo = (struct ifbond __user *)ifr->ifr_data; + + if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) { + return -EFAULT; + } + + res = bond_info_query(bond_dev, &k_binfo); + if (res == 0) { + if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) { + return -EFAULT; + } + } + + return res; + case BOND_SLAVE_INFO_QUERY_OLD: + case SIOCBONDSLAVEINFOQUERY: + u_sinfo = (struct ifslave __user *)ifr->ifr_data; + + if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) { + return -EFAULT; + } + + res = bond_slave_info_query(bond_dev, &k_sinfo); + if (res == 0) { + if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) { + return -EFAULT; + } + } + + return res; + default: + /* Go on */ + break; + } + + if (!capable(CAP_NET_ADMIN)) { + return -EPERM; + } + + if (orig_app_abi_ver == -1) { + /* no orig_app_abi_ver was provided yet, so we'll use the + * current one from now on, even if it's 0 + */ + orig_app_abi_ver = app_abi_ver; + + } else if (orig_app_abi_ver != app_abi_ver) { + printk(KERN_ERR DRV_NAME + ": Error: already using ifenslave ABI version %d; to " + "upgrade ifenslave to version %d, you must first " + "reload bonding.\n", + orig_app_abi_ver, app_abi_ver); + return -EINVAL; + } + + slave_dev = dev_get_by_name(ifr->ifr_slave); + + dprintk("slave_dev=%p: \n", slave_dev); + + if (!slave_dev) { + res = -ENODEV; + } else { + dprintk("slave_dev->name=%s: \n", slave_dev->name); + switch (cmd) { + case BOND_ENSLAVE_OLD: + case SIOCBONDENSLAVE: + res = bond_enslave(bond_dev, slave_dev); + break; + case BOND_RELEASE_OLD: + case SIOCBONDRELEASE: + res = bond_release(bond_dev, slave_dev); + break; + case BOND_SETHWADDR_OLD: + case SIOCBONDSETHWADDR: + res = bond_sethwaddr(bond_dev, slave_dev); + break; + case BOND_CHANGE_ACTIVE_OLD: + case SIOCBONDCHANGEACTIVE: + res = bond_ioctl_change_active(bond_dev, slave_dev); + break; + default: + res = -EOPNOTSUPP; + } + + dev_put(slave_dev); + } + + if (res < 0) { + /* The ioctl failed, so there's no point in changing the + * orig_app_abi_ver. We'll restore it's value just in case + * we've changed it earlier in this function. + */ + orig_app_abi_ver = prev_abi_ver; + } + + return res; +} + +static void bond_set_multicast_list(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct dev_mc_list *dmi; + + write_lock_bh(&bond->lock); + + /* + * Do promisc before checking multicast_mode + */ + if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) { + bond_set_promiscuity(bond, 1); + } + + if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) { + bond_set_promiscuity(bond, -1); + } + + /* set allmulti flag to slaves */ + if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) { + bond_set_allmulti(bond, 1); + } + + if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) { + bond_set_allmulti(bond, -1); + } + + bond->flags = bond_dev->flags; + + /* looking for addresses to add to slaves' mc list */ + for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) { + if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) { + bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen); + } + } + + /* looking for addresses to delete from slaves' list */ + for (dmi = bond->mc_list; dmi; dmi = dmi->next) { + if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) { + bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen); + } + } + + /* save master's multicast list */ + bond_mc_list_destroy(bond); + bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC); + + write_unlock_bh(&bond->lock); +} + +/* + * Change the MTU of all of a master's slaves to match the master + */ +static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *stop_at; + int res = 0; + int i; + + dprintk("bond=%p, name=%s, new_mtu=%d\n", bond, + (bond_dev ? bond_dev->name : "None"), new_mtu); + + /* Can't hold bond->lock with bh disabled here since + * some base drivers panic. On the other hand we can't + * hold bond->lock without bh disabled because we'll + * deadlock. The only solution is to rely on the fact + * that we're under rtnl_lock here, and the slaves + * list won't change. This doesn't solve the problem + * of setting the slave's MTU while it is + * transmitting, but the assumption is that the base + * driver can handle that. + * + * TODO: figure out a way to safely iterate the slaves + * list, but without holding a lock around the actual + * call to the base driver. + */ + + bond_for_each_slave(bond, slave, i) { + dprintk("s %p s->p %p c_m %p\n", slave, + slave->prev, slave->dev->change_mtu); + res = dev_set_mtu(slave->dev, new_mtu); + + if (res) { + /* If we failed to set the slave's mtu to the new value + * we must abort the operation even in ACTIVE_BACKUP + * mode, because if we allow the backup slaves to have + * different mtu values than the active slave we'll + * need to change their mtu when doing a failover. That + * means changing their mtu from timer context, which + * is probably not a good idea. + */ + dprintk("err %d %s\n", res, slave->dev->name); + goto unwind; + } + } + + bond_dev->mtu = new_mtu; + + return 0; + +unwind: + /* unwind from head to the slave that failed */ + stop_at = slave; + bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { + int tmp_res; + + tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); + if (tmp_res) { + dprintk("unwind err %d dev %s\n", tmp_res, + slave->dev->name); + } + } + + return res; +} + +/* + * Change HW address + * + * Note that many devices must be down to change the HW address, and + * downing the master releases all slaves. We can make bonds full of + * bonding devices to test this, however. + */ +static int bond_set_mac_address(struct net_device *bond_dev, void *addr) +{ + struct bonding *bond = bond_dev->priv; + struct sockaddr *sa = addr, tmp_sa; + struct slave *slave, *stop_at; + int res = 0; + int i; + + dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None")); + + if (!is_valid_ether_addr(sa->sa_data)) { + return -EADDRNOTAVAIL; + } + + /* Can't hold bond->lock with bh disabled here since + * some base drivers panic. On the other hand we can't + * hold bond->lock without bh disabled because we'll + * deadlock. The only solution is to rely on the fact + * that we're under rtnl_lock here, and the slaves + * list won't change. This doesn't solve the problem + * of setting the slave's hw address while it is + * transmitting, but the assumption is that the base + * driver can handle that. + * + * TODO: figure out a way to safely iterate the slaves + * list, but without holding a lock around the actual + * call to the base driver. + */ + + bond_for_each_slave(bond, slave, i) { + dprintk("slave %p %s\n", slave, slave->dev->name); + + if (slave->dev->set_mac_address == NULL) { + res = -EOPNOTSUPP; + dprintk("EOPNOTSUPP %s\n", slave->dev->name); + goto unwind; + } + + res = dev_set_mac_address(slave->dev, addr); + if (res) { + /* TODO: consider downing the slave + * and retry ? + * User should expect communications + * breakage anyway until ARP finish + * updating, so... + */ + dprintk("err %d %s\n", res, slave->dev->name); + goto unwind; + } + } + + /* success */ + memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); + return 0; + +unwind: + memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); + tmp_sa.sa_family = bond_dev->type; + + /* unwind from head to the slave that failed */ + stop_at = slave; + bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { + int tmp_res; + + tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); + if (tmp_res) { + dprintk("unwind err %d dev %s\n", tmp_res, + slave->dev->name); + } + } + + return res; +} + +static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *start_at; + int i; + int res = 1; + + read_lock(&bond->lock); + + if (!BOND_IS_OK(bond)) { + goto out; + } + + read_lock(&bond->curr_slave_lock); + slave = start_at = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + if (!slave) { + goto out; + } + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + (slave->state == BOND_STATE_ACTIVE)) { + res = bond_dev_queue_xmit(bond, skb, slave->dev); + + write_lock(&bond->curr_slave_lock); + bond->curr_active_slave = slave->next; + write_unlock(&bond->curr_slave_lock); + + break; + } + } + + +out: + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + } + read_unlock(&bond->lock); + return 0; +} + +/* + * in active-backup mode, we know that bond->curr_active_slave is always valid if + * the bond has a usable interface. + */ +static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + int res = 1; + + /* if we are sending arp packets, try to at least + identify our own ip address */ + if (bond->params.arp_interval && !my_ip && + (skb->protocol == __constant_htons(ETH_P_ARP))) { + char *the_ip = (char *)skb->data + + sizeof(struct ethhdr) + + sizeof(struct arphdr) + + ETH_ALEN; + memcpy(&my_ip, the_ip, 4); + } + + read_lock(&bond->lock); + read_lock(&bond->curr_slave_lock); + + if (!BOND_IS_OK(bond)) { + goto out; + } + + if (bond->curr_active_slave) { /* one usable interface */ + res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev); + } + +out: + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + } + read_unlock(&bond->curr_slave_lock); + read_unlock(&bond->lock); + return 0; +} + +/* + * in XOR mode, we determine the output device by performing xor on + * the source and destination hw adresses. If this device is not + * enabled, find the next slave following this xor slave. + */ +static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct ethhdr *data = (struct ethhdr *)skb->data; + struct slave *slave, *start_at; + int slave_no; + int i; + int res = 1; + + read_lock(&bond->lock); + + if (!BOND_IS_OK(bond)) { + goto out; + } + + slave_no = (data->h_dest[5]^bond_dev->dev_addr[5]) % bond->slave_cnt; + + bond_for_each_slave(bond, slave, i) { + slave_no--; + if (slave_no < 0) { + break; + } + } + + start_at = slave; + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + (slave->state == BOND_STATE_ACTIVE)) { + res = bond_dev_queue_xmit(bond, skb, slave->dev); + break; + } + } + +out: + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + } + read_unlock(&bond->lock); + return 0; +} + +/* + * in broadcast mode, we send everything to all usable interfaces. + */ +static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + struct slave *slave, *start_at; + struct net_device *tx_dev = NULL; + int i; + int res = 1; + + read_lock(&bond->lock); + + if (!BOND_IS_OK(bond)) { + goto out; + } + + read_lock(&bond->curr_slave_lock); + start_at = bond->curr_active_slave; + read_unlock(&bond->curr_slave_lock); + + if (!start_at) { + goto out; + } + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (IS_UP(slave->dev) && + (slave->link == BOND_LINK_UP) && + (slave->state == BOND_STATE_ACTIVE)) { + if (tx_dev) { + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); + if (!skb2) { + printk(KERN_ERR DRV_NAME + ": Error: bond_xmit_broadcast(): " + "skb_clone() failed\n"); + continue; + } + + res = bond_dev_queue_xmit(bond, skb2, tx_dev); + if (res) { + dev_kfree_skb(skb2); + continue; + } + } + tx_dev = slave->dev; + } + } + + if (tx_dev) { + res = bond_dev_queue_xmit(bond, skb, tx_dev); + } + +out: + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + } + /* frame sent to all suitable interfaces */ + read_unlock(&bond->lock); + return 0; +} + +/*------------------------- Device initialization ---------------------------*/ + +/* + * set bond mode specific net device operations + */ +static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode) +{ + switch (mode) { + case BOND_MODE_ROUNDROBIN: + bond_dev->hard_start_xmit = bond_xmit_roundrobin; + break; + case BOND_MODE_ACTIVEBACKUP: + bond_dev->hard_start_xmit = bond_xmit_activebackup; + break; + case BOND_MODE_XOR: + bond_dev->hard_start_xmit = bond_xmit_xor; + break; + case BOND_MODE_BROADCAST: + bond_dev->hard_start_xmit = bond_xmit_broadcast; + break; + case BOND_MODE_8023AD: + bond_dev->hard_start_xmit = bond_3ad_xmit_xor; + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + bond_dev->hard_start_xmit = bond_alb_xmit; + bond_dev->set_mac_address = bond_alb_set_mac_address; + break; + default: + /* Should never happen, mode already checked */ + printk(KERN_ERR DRV_NAME + ": Error: Unknown bonding mode %d\n", + mode); + break; + } +} + +/* + * Does not allocate but creates a /proc entry. + * Allowed to fail. + */ +static int __init bond_init(struct net_device *bond_dev, struct bond_params *params) +{ + struct bonding *bond = bond_dev->priv; + + dprintk("Begin bond_init for %s\n", bond_dev->name); + + /* initialize rwlocks */ + rwlock_init(&bond->lock); + rwlock_init(&bond->curr_slave_lock); + + bond->params = *params; /* copy params struct */ + + /* Initialize pointers */ + bond->first_slave = NULL; + bond->curr_active_slave = NULL; + bond->current_arp_slave = NULL; + bond->primary_slave = NULL; + bond->dev = bond_dev; + INIT_LIST_HEAD(&bond->vlan_list); + + /* Initialize the device entry points */ + bond_dev->open = bond_open; + bond_dev->stop = bond_close; + bond_dev->get_stats = bond_get_stats; + bond_dev->do_ioctl = bond_do_ioctl; + bond_dev->set_multicast_list = bond_set_multicast_list; + bond_dev->change_mtu = bond_change_mtu; + bond_dev->set_mac_address = bond_set_mac_address; + + bond_set_mode_ops(bond_dev, bond->params.mode); + + bond_dev->destructor = free_netdev; + + /* Initialize the device options */ + bond_dev->tx_queue_len = 0; + bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; + + /* 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 xmit_lock when + * transmitting */ + bond_dev->features |= NETIF_F_LLTX; + + /* By default, we declare the bond to be fully + * VLAN hardware accelerated capable. Special + * care is taken in the various xmit functions + * when there are slaves that are not hw accel + * capable + */ + bond_dev->vlan_rx_register = bond_vlan_rx_register; + bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid; + bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid; + bond_dev->features |= (NETIF_F_HW_VLAN_TX | + NETIF_F_HW_VLAN_RX | + NETIF_F_HW_VLAN_FILTER); + +#ifdef CONFIG_PROC_FS + bond_create_proc_entry(bond); +#endif + + list_add_tail(&bond->bond_list, &bond_dev_list); + + return 0; +} + +/* De-initialize device specific data. + * Caller must hold rtnl_lock. + */ +static inline void bond_deinit(struct net_device *bond_dev) +{ + struct bonding *bond = bond_dev->priv; + + list_del(&bond->bond_list); + +#ifdef CONFIG_PROC_FS + bond_remove_proc_entry(bond); +#endif +} + +/* Unregister and free all bond devices. + * Caller must hold rtnl_lock. + */ +static void bond_free_all(void) +{ + struct bonding *bond, *nxt; + + list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) { + struct net_device *bond_dev = bond->dev; + + unregister_netdevice(bond_dev); + bond_deinit(bond_dev); + } + +#ifdef CONFIG_PROC_FS + bond_destroy_proc_dir(); +#endif +} + +/*------------------------- Module initialization ---------------------------*/ + +/* + * Convert string input module parms. Accept either the + * number of the mode or its string name. + */ +static inline int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl) +{ + int i; + + for (i = 0; tbl[i].modename; i++) { + if ((isdigit(*mode_arg) && + tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) || + (strncmp(mode_arg, tbl[i].modename, + strlen(tbl[i].modename)) == 0)) { + return tbl[i].mode; + } + } + + return -1; +} + +static int bond_check_params(struct bond_params *params) +{ + /* + * Convert string parameters. + */ + if (mode) { + bond_mode = bond_parse_parm(mode, bond_mode_tbl); + if (bond_mode == -1) { + printk(KERN_ERR DRV_NAME + ": Error: Invalid bonding mode \"%s\"\n", + mode == NULL ? "NULL" : mode); + return -EINVAL; + } + } + + if (lacp_rate) { + if (bond_mode != BOND_MODE_8023AD) { + printk(KERN_INFO DRV_NAME + ": lacp_rate param is irrelevant in mode %s\n", + bond_mode_name(bond_mode)); + } else { + lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); + if (lacp_fast == -1) { + printk(KERN_ERR DRV_NAME + ": Error: Invalid lacp rate \"%s\"\n", + lacp_rate == NULL ? "NULL" : lacp_rate); + return -EINVAL; + } + } + } + + if (max_bonds < 1 || max_bonds > INT_MAX) { + printk(KERN_WARNING DRV_NAME + ": Warning: max_bonds (%d) not in range %d-%d, so it " + "was reset to BOND_DEFAULT_MAX_BONDS (%d)", + max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS); + max_bonds = BOND_DEFAULT_MAX_BONDS; + } + + if (miimon < 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: miimon module parameter (%d), " + "not in range 0-%d, so it was reset to %d\n", + miimon, INT_MAX, BOND_LINK_MON_INTERV); + miimon = BOND_LINK_MON_INTERV; + } + + if (updelay < 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: updelay module parameter (%d), " + "not in range 0-%d, so it was reset to 0\n", + updelay, INT_MAX); + updelay = 0; + } + + if (downdelay < 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: downdelay module parameter (%d), " + "not in range 0-%d, so it was reset to 0\n", + downdelay, INT_MAX); + downdelay = 0; + } + + if ((use_carrier != 0) && (use_carrier != 1)) { + printk(KERN_WARNING DRV_NAME + ": Warning: use_carrier module parameter (%d), " + "not of valid value (0/1), so it was set to 1\n", + use_carrier); + use_carrier = 1; + } + + /* reset values for 802.3ad */ + if (bond_mode == BOND_MODE_8023AD) { + if (!miimon) { + printk(KERN_WARNING DRV_NAME + ": Warning: miimon must be specified, " + "otherwise bonding will not detect link " + "failure, speed and duplex which are " + "essential for 802.3ad operation\n"); + printk(KERN_WARNING "Forcing miimon to 100msec\n"); + miimon = 100; + } + } + + /* reset values for TLB/ALB */ + if ((bond_mode == BOND_MODE_TLB) || + (bond_mode == BOND_MODE_ALB)) { + if (!miimon) { + printk(KERN_WARNING DRV_NAME + ": Warning: miimon must be specified, " + "otherwise bonding will not detect link " + "failure and link speed which are essential " + "for TLB/ALB load balancing\n"); + printk(KERN_WARNING "Forcing miimon to 100msec\n"); + miimon = 100; + } + } + + if (bond_mode == BOND_MODE_ALB) { + printk(KERN_NOTICE DRV_NAME + ": In ALB mode you might experience client " + "disconnections upon reconnection of a link if the " + "bonding module updelay parameter (%d msec) is " + "incompatible with the forwarding delay time of the " + "switch\n", + updelay); + } + + if (!miimon) { + if (updelay || downdelay) { + /* just warn the user the up/down delay will have + * no effect since miimon is zero... + */ + printk(KERN_WARNING DRV_NAME + ": Warning: miimon module parameter not set " + "and updelay (%d) or downdelay (%d) module " + "parameter is set; updelay and downdelay have " + "no effect unless miimon is set\n", + updelay, downdelay); + } + } else { + /* don't allow arp monitoring */ + if (arp_interval) { + printk(KERN_WARNING DRV_NAME + ": Warning: miimon (%d) and arp_interval (%d) " + "can't be used simultaneously, disabling ARP " + "monitoring\n", + miimon, arp_interval); + arp_interval = 0; + } + + if ((updelay % miimon) != 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: updelay (%d) is not a multiple " + "of miimon (%d), updelay rounded to %d ms\n", + updelay, miimon, (updelay / miimon) * miimon); + } + + updelay /= miimon; + + if ((downdelay % miimon) != 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: downdelay (%d) is not a multiple " + "of miimon (%d), downdelay rounded to %d ms\n", + downdelay, miimon, + (downdelay / miimon) * miimon); + } + + downdelay /= miimon; + } + + if (arp_interval < 0) { + printk(KERN_WARNING DRV_NAME + ": Warning: arp_interval module parameter (%d) " + ", not in range 0-%d, so it was reset to %d\n", + arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); + arp_interval = BOND_LINK_ARP_INTERV; + } + + for (arp_ip_count = 0; + (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; + arp_ip_count++) { + /* not complete check, but should be good enough to + catch mistakes */ + if (!isdigit(arp_ip_target[arp_ip_count][0])) { + printk(KERN_WARNING DRV_NAME + ": Warning: bad arp_ip_target module parameter " + "(%s), ARP monitoring will not be performed\n", + arp_ip_target[arp_ip_count]); + arp_interval = 0; + } else { + u32 ip = in_aton(arp_ip_target[arp_ip_count]); + arp_target[arp_ip_count] = ip; + } + } + + if (arp_interval && !arp_ip_count) { + /* don't allow arping if no arp_ip_target given... */ + printk(KERN_WARNING DRV_NAME + ": Warning: arp_interval module parameter (%d) " + "specified without providing an arp_ip_target " + "parameter, arp_interval was reset to 0\n", + arp_interval); + arp_interval = 0; + } + + if (miimon) { + printk(KERN_INFO DRV_NAME + ": MII link monitoring set to %d ms\n", + miimon); + } else if (arp_interval) { + int i; + + printk(KERN_INFO DRV_NAME + ": ARP monitoring set to %d ms with %d target(s):", + arp_interval, arp_ip_count); + + for (i = 0; i < arp_ip_count; i++) + printk (" %s", arp_ip_target[i]); + + printk("\n"); + + } else { + /* miimon and arp_interval not set, we need one so things + * work as expected, see bonding.txt for details + */ + printk(KERN_WARNING DRV_NAME + ": Warning: either miimon or arp_interval and " + "arp_ip_target module parameters must be specified, " + "otherwise bonding will not detect link failures! see " + "bonding.txt for details.\n"); + } + + if (primary && !USES_PRIMARY(bond_mode)) { + /* currently, using a primary only makes sense + * in active backup, TLB or ALB modes + */ + printk(KERN_WARNING DRV_NAME + ": Warning: %s primary device specified but has no " + "effect in %s mode\n", + primary, bond_mode_name(bond_mode)); + primary = NULL; + } + + /* fill params struct with the proper values */ + params->mode = bond_mode; + params->miimon = miimon; + params->arp_interval = arp_interval; + params->updelay = updelay; + params->downdelay = downdelay; + params->use_carrier = use_carrier; + params->lacp_fast = lacp_fast; + params->primary[0] = 0; + + if (primary) { + strncpy(params->primary, primary, IFNAMSIZ); + params->primary[IFNAMSIZ - 1] = 0; + } + + memcpy(params->arp_targets, arp_target, sizeof(arp_target)); + + return 0; +} + +static int __init bonding_init(void) +{ + struct bond_params params; + int i; + int res; + + printk(KERN_INFO "%s", version); + + res = bond_check_params(¶ms); + if (res) { + return res; + } + + rtnl_lock(); + +#ifdef CONFIG_PROC_FS + bond_create_proc_dir(); +#endif + + for (i = 0; i < max_bonds; i++) { + struct net_device *bond_dev; + + bond_dev = alloc_netdev(sizeof(struct bonding), "", ether_setup); + if (!bond_dev) { + res = -ENOMEM; + goto out_err; + } + + res = dev_alloc_name(bond_dev, "bond%d"); + if (res < 0) { + free_netdev(bond_dev); + goto out_err; + } + + /* bond_init() must be called after dev_alloc_name() (for the + * /proc files), but before register_netdevice(), because we + * need to set function pointers. + */ + res = bond_init(bond_dev, ¶ms); + if (res < 0) { + free_netdev(bond_dev); + goto out_err; + } + + SET_MODULE_OWNER(bond_dev); + + res = register_netdevice(bond_dev); + if (res < 0) { + bond_deinit(bond_dev); + free_netdev(bond_dev); + goto out_err; + } + } + + rtnl_unlock(); + register_netdevice_notifier(&bond_netdev_notifier); + + return 0; + +out_err: + /* free and unregister all bonds that were successfully added */ + bond_free_all(); + + rtnl_unlock(); + + return res; +} + +static void __exit bonding_exit(void) +{ + unregister_netdevice_notifier(&bond_netdev_notifier); + + rtnl_lock(); + bond_free_all(); + rtnl_unlock(); +} + +module_init(bonding_init); +module_exit(bonding_exit); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); +MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); +MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); +MODULE_SUPPORTED_DEVICE("most ethernet devices"); + +/* + * Local variables: + * c-indent-level: 8 + * c-basic-offset: 8 + * tab-width: 8 + * End: + */ + |