[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/2113868
Title:
Backport request for fix for IPsec UDP GRO option issue
Status in linux package in Ubuntu:
Expired
Bug description:
Since kernel v6.7, GRO offloading of UDP-encapsulated ESP packets is
supported. This is enabled for individual UDP sockets via the
UDP_ENCAP_ESPINUDP and UDP_GRO options.
Unfortunately, the original implementation caused issues in some
cases. In particular, if the esp4_offload/esp6_offload modules are not
loaded (the default). This could prevent IKE or UDP-encapsulated ESP
packets from getting received on such a socket. As this happens in the
kernel's GRO layer, there is no indication to the user that a packet
was received and dropped (e.g. in tcpdump/Wireshark or Netfilter). So
it's difficult to debug.
A fix for this issue was included in v6.15 and backported to the two
affected stable/longterm trees (6.14 and 6.12):
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e3fd0577768584ece824c8b661c40fb3d912812a
But because the kernels in Ubuntu 22.04 LTS (HWE) and 24.04 LTS (HWE)
are 6.8 and 6.11, which are both affected but no official longterm
kernels, the fix might not get backported automatically.
So I'd like to request a backport explicitly because we intend to
enable the UDP_GRO option in the next strongSwan release, which some
users are likely going to run on Ubuntu LTS.
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