[bpf-next,V1,0/2] bpf: Updates for BPF-helper bpf_check_mtu

Message

Jesper Dangaard Brouer Feb. 15, 2021, 3:52 p.m. UTC

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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