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* kernel: Backport upstream flowtable patches from 5.15Hauke Mehrtens2022-08-141-0/+47
This backports some patches from kernel 5.15 to fix issues with flowtable offloading in kernel 5.10. OpenWrt backports most of the patches related to flowtable offloading from kernel 5.15 already, but we are missing some of the extra fixes. This fixes some connection tracking problems when a flow gets removed from the offload and added to the normal SW path again. The patch 614-v5.18-netfilter-flowtable-fix-TCP-flow-teardown.patch was extended manually with the nf_conntrack_tcp_established() function. All changes are already included in kernel 5.15. Fixes: #8776 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> (cherry picked from commit 96ef2dabce1a5f102d53a15f33383193b47fd297)