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Gergely Risko a914e1132f ipv6: fix reachability confirmation with proxy_ndp 
commit 9f535c870e upstream.

When proxying IPv6 NDP requests, the adverts to the initial multicast
solicits are correct and working.  On the other hand, when later a
reachability confirmation is requested (on unicast), no reply is sent.

This causes the neighbor entry expiring on the sending node, which is
mostly a non-issue, as a new multicast request is sent.  There are
routers, where the multicast requests are intentionally delayed, and in
these environments the current implementation causes periodic packet
loss for the proxied endpoints.

The root cause is the erroneous decrease of the hop limit, as this
is checked in ndisc.c and no answer is generated when it's 254 instead
of the correct 255.

Cc: stable@vger.kernel.org
Fixes: 46c7655f0b ("ipv6: decrease hop limit counter in ip6_forward()")
Signed-off-by: Gergely Risko <gergely.risko@gmail.com>
Tested-by: Gergely Risko <gergely.risko@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-02-01 08:34:39 +01:00
arch riscv: fix -Wundef warning for CONFIG_RISCV_BOOT_SPINWAIT 2023-02-01 08:34:39 +01:00
block block: mq-deadline: Rename deadline_is_seq_writes() 2023-01-24 07:24:44 +01:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto crypto: tcrypt - Fix multibuffer skcipher speed test mem leak 2022-12-31 13:32:34 +01:00
Documentation regulator: dt-bindings: samsung,s2mps14: add lost samsung,ext-control-gpios 2023-02-01 08:34:39 +01:00
drivers thermal: intel: int340x: Protect trip temperature from concurrent updates 2023-02-01 08:34:39 +01:00
fs ovl: fail on invalid uid/gid mapping at copy up 2023-02-01 08:34:38 +01:00
include scsi: ufs: core: Fix devfreq deadlocks 2023-02-01 08:34:39 +01:00
init gcc: disable -Warray-bounds for gcc-11 too 2023-01-14 10:33:43 +01:00
io_uring io_uring/net: cache provided buffer group value for multishot receives 2023-02-01 08:34:38 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel trace_events_hist: add check for return value of 'create_hist_field' 2023-02-01 08:34:37 +01:00
lib lockref: stop doing cpu_relax in the cmpxchg loop 2023-02-01 08:34:34 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm panic: Consolidate open-coded panic_on_warn checks 2023-01-24 07:24:41 +01:00
net ipv6: fix reachability confirmation with proxy_ndp 2023-02-01 08:34:39 +01:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples ftrace: Export ftrace_free_filter() to modules 2023-02-01 08:34:37 +01:00
scripts ftrace/scripts: Update the instructions for ftrace-bisect.sh 2023-02-01 08:34:37 +01:00
security tomoyo: fix broken dependency on *.conf.default 2023-02-01 08:34:06 +01:00
sound ASoC: fsl-asoc-card: Fix naming of AC'97 CODEC widgets 2023-02-01 08:34:31 +01:00
tools Revert "selftests/bpf: check null propagation only neither reg is PTR_TO_BTF_ID" 2023-02-01 08:34:34 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt kvm/vfio: Fix potential deadlock on vfio group_lock 2023-02-01 08:34:36 +01:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS panic: Expose "warn_count" to sysfs 2023-01-24 07:24:41 +01:00
Makefile kbuild: fix 'make modules' error when CONFIG_DEBUG_INFO_BTF_MODULES=y 2023-02-01 08:34:08 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 Restructured Text 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.