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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
052c82dcdc