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Hangbin Liu 5c3bf6cba7 bonding: assign random address if device address is same as bond 
This change addresses a MAC address conflict issue in failover scenarios,
similar to the problem described in commit a951bc1e6b ("bonding: correct
the MAC address for 'follow' fail_over_mac policy").

In fail_over_mac=follow mode, the bonding driver expects the formerly active
slave to swap MAC addresses with the newly active slave during failover.
However, under certain conditions, two slaves may end up with the same MAC
address, which breaks this policy:

1) ip link set eth0 master bond0
   -> bond0 adopts eth0's MAC address (MAC0).

2) ip link set eth1 master bond0
   -> eth1 is added as a backup with its own MAC (MAC1).

3) ip link set eth0 nomaster
   -> eth0 is released and restores its MAC (MAC0).
   -> eth1 becomes the active slave, and bond0 assigns MAC0 to eth1.

4) ip link set eth0 master bond0
   -> eth0 is re-added to bond0, now both eth0 and eth1 have MAC0.

This results in a MAC address conflict and violates the expected behavior
of the failover policy.

To fix this, we assign a random MAC address to any newly added slave if
its current MAC address matches that of the bond. The original (permanent)
MAC address is saved and will be restored when the device is released
from the bond.

This ensures that each slave has a unique MAC address during failover
transitions, preserving the integrity of the fail_over_mac=follow policy.

Fixes: 3915c1e863 ("bonding: Add "follow" option to fail_over_mac")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2025-04-28 12:37:54 +01:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
block vfs-6.15-rc3.fixes.2 2025-04-19 14:31:08 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: scomp - Fix off-by-one bug when calculating last page 2025-04-23 09:32:57 +08:00
Documentation rxrpc: Remove deadcode 2025-04-24 17:03:45 -07:00
drivers bonding: assign random address if device address is same as bond 2025-04-28 12:37:54 +01:00
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
include net: ethernet: mtk_wed: annotate RCU release in attach() 2025-04-24 18:22:05 -07:00
init Kconfig: switch CONFIG_SYSFS_SYCALL default to n 2025-04-15 10:28:35 +02:00
io_uring io_uring/zcrx: fix late dma unmap for a dead dev 2025-04-18 06:12:10 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
lib hardening fixes for v6.15-rc3 2025-04-18 13:20:20 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
net tcp: fastopen: pass TFO child indication through getsockopt 2025-04-24 18:21:04 -07:00
rust rust: helpers: Add dma_alloc_attrs() and dma_free_attrs() 2025-04-15 23:06:03 +02:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-17 12:26:50 -07:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
security Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
sound ASoC: Fixes for v6.15 2025-04-11 15:51:19 +02:00
tools io_uring/zcrx: selftests: add test case for rss ctx 2025-04-25 18:44:10 -07:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt ARM: 2025-04-08 13:47:55 -07:00
.clang-format clang-format: Update the ForEachMacros list for v6.15-rc1 2025-04-13 11:03:59 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-01-10 00:17:25 +01:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00
.mailmap sound fixes for 6.15-rc3 2025-04-17 10:14:51 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: update SLAB ALLOCATOR maintainers 2025-04-17 20:10:06 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-24 11:20:52 -07:00
Makefile Fix mis-uses of 'cc-option' for warning disablement 2025-04-23 10:08:29 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.