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Antonio Quartulli 4e51141f1d ovpn: set skb->ignore_df = 1 before sending IPv6 packets out
IPv6 user packets (sent over the tunnel) may be larger than
the outgoing interface MTU after encapsulation.
When this happens ovpn should allow the kernel to fragment
them because they are "locally generated".

To achieve the above, we must set skb->ignore_df = 1
so that ip6_fragment() can be made aware of this decision.

Failing to do so will result in ip6_fragment() dropping
the packet thinking it was "routed".

No change is required in the IPv4 path, because when
calling udp_tunnel_xmit_skb() we already pass the
'df' argument set to 0, therefore the resulting datagram
is allowed to be fragmented if need be.

Fixes: 08857b5ec5 ("ovpn: implement basic TX path (UDP)")
Reported-by: Gert Doering <gert@greenie.muc.de>
Closes: https://github.com/OpenVPN/ovpn-net-next/issues/3
Tested-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Gert Doering <gert@greenie.muc.de> # as primary user
Link: https://mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31577.html
Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
History 2025-05-15 13:09:36 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-08 08:59:02 -07:00
block block-6.15-20250424 2025-04-25 11:34:39 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-01 15:11:38 -07:00
Documentation net: enable driver support for netmem TX 2025-05-13 11:12:49 +02:00
drivers ovpn: set skb->ignore_df = 1 before sending IPv6 packets out 2025-05-15 13:09:36 +02:00
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-08 08:59:02 -07:00
include net: phy: remove stub for mdiobus_register_board_info 2025-05-13 16:39:45 -07:00
init Kconfig: switch CONFIG_SYSFS_SYCALL default to n 2025-04-15 10:28:35 +02:00
io_uring net: devmem: Implement TX path 2025-05-13 11:12:48 +02:00
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 2025-05-08 08:59:02 -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 2025-05-08 08:59:02 -07:00
net net: check for driver support in netmem TX 2025-05-13 11:12:49 +02:00
rust Driver core fixes for 6.15-rc4 2025-04-25 10:02:59 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-01 15:11:38 -07:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-01 15:11:38 -07:00
security Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-01 15:11:38 -07:00
sound ASoC: Fixes for v6.15 2025-05-01 10:22:20 +02:00
tools tools: ynl-gen: support struct for binary attributes 2025-05-13 13:22:32 +02:00
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 scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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 MAINTAINERS: update git URL for ovpn 2025-05-15 13:09:36 +02:00
Makefile Linux 6.15-rc5 2025-05-04 13:55:04 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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.