commit 36867351ecd0e2d1ad50d76da2df778ad319a75d
author Maciej Żenczykowski <maze@google.com> Mon Feb 15 01:53:17 2021 -0800
committer Maciej Żenczykowski <maze@google.com> Tue Feb 16 05:48:55 2021 +0000
tree b451ed6067fb3bd930c6b7020261a65efead0a46
parent d74918c6d2d2eefca0879950042d2fb5c6b2b9a6

offload ebpf - introduce 4.14+ ipv4 forwarding programs

We've backported the necessary support to all 4.14+ ACK kernels,
but we can't actually enforce that these changes will be picked
up by all devices.  Thus we can only make the full featured
implementations optional on [4.14..5.8) kernels, with a tcp-only
version for those 4.14+ devices where the full featured version
fails to load.

Note: there's still a fair bit of implementation work left
in the do_forward4() function itself.  This is really just
the skeleton.

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If78123e00d55a77f2ecd7da1547581797e23f9b2

Tethering/bpf_progs/bpf_tethering.h

diff --git a/Tethering/bpf_progs/bpf_tethering.h b/Tethering/bpf_progs/bpf_tethering.h
index c8ada88..10e6bb0 100644
--- a/Tethering/bpf_progs/bpf_tethering.h
+++ b/Tethering/bpf_progs/bpf_tethering.h
@@ -40,6 +40,7 @@
     ERR(IS_IP_FRAG)          \
     ERR(CHECKSUM)            \
     ERR(NON_TCP_UDP)         \
+    ERR(NON_TCP)             \
     ERR(SHORT_TCP_HEADER)    \
     ERR(SHORT_UDP_HEADER)    \
     ERR(TRUNCATED_IPV4)      \