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()")
[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=95224166a90 3 /git.kernel. org/pub/ scm/linux/ kernel/ git/torvalds/ linux.git/ commit/ ?id=f042365dbff e
https:/
The bug exists since the beginning of each driver.
== Fix ==
Backport the requested patches to Focal (5.4), Disco (5.0), 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.