selftests/bpf: Use if_nametoindex instead of reading the /sys/net/class/*/ifindex

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When switching netns, the setns_by_fd() is doing dances in mount/umounting
the /sys directories.  One reason is the tc_redirect.c test is depending
on the /sys/net/class/*/ifindex instead of using the if_nametoindex().
if_nametoindex() uses ioctl() to get the ifindex.

This patch is to move all /sys/net/class/*/ifindex usages to
if_nametoindex().  The current code checks ifindex >= 0 which is
incorrect.  ifindex > 0 should be checked instead.  This patch also
stores ifindex_veth_src and ifindex_veth_dst since the latter patch
will need them.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20221129070900.3142427-2-martin.lau@linux.dev

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Martin KaFai Lau 2022-11-28 23:08:54 -08:00 • committed by Daniel Borkmann

parent 91a7de8560

commit 052c82dcdc

1 changed files with 18 additions and 28 deletions

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tools/testing/selftests/bpf/prog_tests/tc_redirect.c

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