Commit f07cbad2 authored by Andrey Ignatov's avatar Andrey Ignatov Committed by Daniel Borkmann

libbpf: Fix bpf_get_link_xdp_id flags handling

Currently if one of XDP_FLAGS_{DRV,HW,SKB}_MODE flags is passed to
bpf_get_link_xdp_id() and there is a single XDP program attached to
ifindex, that program's id will be returned by bpf_get_link_xdp_id() in
prog_id argument no matter what mode the program is attached in, i.e.
flags argument is not taken into account.

For example, if there is a single program attached with
XDP_FLAGS_SKB_MODE but user calls bpf_get_link_xdp_id() with flags =
XDP_FLAGS_DRV_MODE, that skb program will be returned.

Fix it by returning info->prog_id only if user didn't specify flags. If
flags is specified then return corresponding mode-specific-field from
struct xdp_link_info.

The initial error was introduced in commit 50db9f07 ("libbpf: Add a
support for getting xdp prog id on ifindex") and then refactored in
473f4e13 so 473f4e13 is used in the Fixes tag.

Fixes: 473f4e13 ("libbpf: Add bpf_get_link_xdp_info() function to get more XDP information")
Signed-off-by: default avatarAndrey Ignatov <rdna@fb.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/0e9e30490b44b447bb2bebc69c7135e7fe7e4e40.1586236080.git.rdna@fb.com
parent 489553dd
......@@ -321,7 +321,7 @@ int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
static __u32 get_xdp_id(struct xdp_link_info *info, __u32 flags)
{
if (info->attach_mode != XDP_ATTACHED_MULTI)
if (info->attach_mode != XDP_ATTACHED_MULTI && !flags)
return info->prog_id;
if (flags & XDP_FLAGS_DRV_MODE)
return info->drv_prog_id;
......
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