The FIB lookup example[1] show how the IP-header field tot_len
(iph->tot_len) is used as input to perform the MTU check. The recently
added MTU check helper bpf_check_mtu() should also support this type
of MTU check.
Lets add this feature before merge window, please. This is a followup
to 34b2021cc616 ("bpf: Add BPF-helper for MTU checking").
[1] samples/bpf/xdp_fwd_kern.c
---
Jesper Dangaard Brouer (2):
bpf: BPF-helper for MTU checking add length input
selftests/bpf: Tests using bpf_check_mtu BPF-helper input mtu_len param
include/uapi/linux/bpf.h | 17 ++--
net/core/filter.c | 12 ++-
tools/testing/selftests/bpf/prog_tests/check_mtu.c | 4 +
tools/testing/selftests/bpf/progs/test_check_mtu.c | 92 ++++++++++++++++++++
4 files changed, 117 insertions(+), 8 deletions(-)
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