[SRU][F/E/B/X][PATCH 0/2] ipsec interfaces: fix sending with bpf_redirect() / AF_PACKET sockets

[Kelsey Skunberg]

BugLink: https://bugs.launchpad.net/bugs/1860969

[SRU Justification]

[Impact]

Packets sent to a vti[6]/xfrm interface via bpf_redirect() or via an AF_PACKET socket are dropped (no carrier).

This has been fixed in v5.5 by the following upstream commits
 - 95224166a903 ("vti[6]: fix packet tx through bpf_redirect()")
 - f042365dbffe ("xfrm interface: fix packet tx through bpf_redirect()")

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95224166a903
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f042365dbffe

The bug exists since the beginning of each driver.

== Fix ==

Backport the requested patches to Focal (5.4), Eoan (5.3), Bionic (4.15) and
Xenial (4.4).

== Risk of Regression ==

This patch affects only the cases described above (when no dst is attached to the skb), thus the risk should be low.

Nicolas Dichtel (2):
  vti[6]: fix packet tx through bpf_redirect()
  xfrm interface: fix packet tx through bpf_redirect()

 net/ipv4/ip_vti.c         | 13 +++++++++++--
 net/ipv6/ip6_vti.c        | 13 +++++++++++--
 net/xfrm/xfrm_interface.c | 32 +++++++++++++++++++++++++-------
 3 files changed, 47 insertions(+), 11 deletions(-)

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2.20.1