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libbpf: Fix type of old_fd in bpf_xdp_set_link_opts 

The 'old_fd' parameter used for atomic replacement of XDP programs is
supposed to be an FD, but was left as a u32 from an earlier iteration of
the patch that added it. It was converted to an int when read, so things
worked correctly even with negative values, but better change the
definition to correctly reflect the intention.

Fixes: bd5ca3ef93 ("libbpf: Add function to set link XDP fd while specifying old program")
Reported-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200414145025.182163-1-toke@redhat.com
This commit is contained in:
Toke Høiland-Jørgensen 2020-04-14 16:50:24 +02:00 committed by Daniel Borkmann
parent 25498a1969
commit 49b452c382
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/libbpf.h
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@ -458,7 +458,7 @@ struct xdp_link_info {
struct bpf_xdp_set_link_opts {
size_t sz;
__u32 old_fd;
int old_fd;
};
#define bpf_xdp_set_link_opts__last_field old_fd