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Ido Schimmel 6933cd4714 ipv6: Align behavior across nexthops during path selection 
A nexthop is only chosen when the calculated multipath hash falls in the
nexthop's hash region (i.e., the hash is smaller than the nexthop's hash
threshold) and when the nexthop is assigned a non-negative score by
rt6_score_route().

Commit 4d0ab3a688 ("ipv6: Start path selection from the first
nexthop") introduced an unintentional difference between the first
nexthop and the rest when the score is negative.

When the first nexthop matches, but has a negative score, the code will
currently evaluate subsequent nexthops until one is found with a
non-negative score. On the other hand, when a different nexthop matches,
but has a negative score, the code will fallback to the nexthop with
which the selection started ('match').

Align the behavior across all nexthops and fallback to 'match' when the
first nexthop matches, but has a negative score.

Fixes: 3d709f69a3 ("ipv6: Use hash-threshold instead of modulo-N")
Fixes: 4d0ab3a688 ("ipv6: Start path selection from the first nexthop")
Reported-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Closes: https://lore.kernel.org/netdev/67efef607bc41_1ddca82948c@willemb.c.googlers.com.notmuch/
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250408084316.243559-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-04-09 18:00:06 -07:00
arch Miscellaneous x86 fixes: 2025-04-04 07:12:26 -07:00
block block: don't grab elevator lock during queue initialization 2025-04-03 08:32:03 -06:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push fixes reverts the multibuffer hash testing as it is buggy. 2025-04-02 09:14:59 -07:00
Documentation net: hold instance lock during NETDEV_CHANGE 2025-04-07 11:13:39 -07:00
drivers net: phy: allow MDIO bus PM ops to start/stop state machine for phylink-controlled PHY 2025-04-09 17:56:08 -07:00
fs 4 ksmbd SMB3 server fixes, all also for stable 2025-04-03 16:18:06 -07:00
include sctp: detect and prevent references to a freed transport in sendmsg 2025-04-08 11:34:06 +02:00
init ARM and clkdev updates for 6.15-rc1 2025-04-03 12:21:44 -07:00
io_uring io_uring: always do atomic put from iowq 2025-04-03 08:31:57 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel Persistent buffer cleanups and simplifications for v6.15: 2025-04-03 16:09:29 -07:00
lib One bugfix and a couple of small late-arriving updates. 2025-04-03 11:16:57 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm - The 2 patch series "mm: fixes for fallouts from mem_init() cleanup" 2025-04-03 11:10:00 -07:00
net ipv6: Align behavior across nexthops during path selection 2025-04-09 18:00:06 -07:00
rust ARM and clkdev updates for 6.15-rc1 2025-04-03 12:21:44 -07:00
samples tracing fixes for 6.15 2025-04-03 09:52:44 -07:00
scripts ARM and clkdev updates for 6.15-rc1 2025-04-03 12:21:44 -07:00
security mseal sysmap: kernel config and header change 2025-04-01 15:17:14 -07:00
sound sound fixes for 6.15-rc1 2025-04-04 07:05:33 -07:00
tools selftests/tc-testing: sfq: check that a derived limit of 1 is rejected 2025-04-09 12:55:48 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt ARM: 2025-03-25 14:22:07 -07:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +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 rust: use host dylib naming convention to support macOS 2025-01-10 01:01:24 +01:00
.mailmap mailmap: add an entry for Nicolas Schier 2025-04-01 15:20:45 -07:00
.rustfmt.toml
COPYING
CREDITS Including fixes from netfilter. 2025-04-04 09:15:35 -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 Including fixes from netfilter. 2025-04-04 09:15:35 -07:00
Makefile [ Merge note: this pull request depends on you having merged 2025-03-24 22:06:11 -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.