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UPSTREAM: bpf: Fix build without CONFIG_NET when using BPF XDP link

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Entire net/core subsystem is not built without CONFIG_NET. linux/netdevice.h
just assumes that it's always there, so the easiest way to fix this is to
conditionally compile out bpf_xdp_link_attach() use in bpf/syscall.c.

Fixes: aa8d3a716b59 ("bpf, xdp: Add bpf_link-based XDP attachment API")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Change-Id: I8e2e9fabcda1234326e3cc4101f689e51cc9dd91
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200728190527.110830-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-07-28 12:05:27 -07:00 • committed by basamaryan
commit f8021e2b60
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kernel/bpf/syscall.c
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@ -3921,9 +3921,11 @@ static int link_create(union bpf_attr *attr)
case BPF_PROG_TYPE_SK_LOOKUP:
ret = netns_bpf_link_create(attr, prog);
break;
#ifdef CONFIG_NET
case BPF_PROG_TYPE_XDP:
ret = bpf_xdp_link_attach(attr, prog);
break;
#endif
default:
ret = -EINVAL;
}