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authorDaniel Borkmann <daniel@iogearbox.net>2015-03-01 12:31:43 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-01 14:05:19 -0500
commitf1a66f85b74c5ef7b503f746ea97742dacd56419 (patch)
tree74e50377321d7afae02ebf494ee523cb878d285a /samples/bpf
parenta2c83fff582ae133d9f5bb187404ea9ce4da1f96 (diff)
downloadlinux-f1a66f85b74c5ef7b503f746ea97742dacd56419.tar.gz
ebpf: export BPF_PSEUDO_MAP_FD to uapi
We need to export BPF_PSEUDO_MAP_FD to user space, as it's used in the ELF BPF loader where instructions are being loaded that need map fixups. An initial stage loads all maps into the kernel, and later on replaces related instructions in the eBPF blob with BPF_PSEUDO_MAP_FD as source register and the actual fd as immediate value. The kernel verifier recognizes this keyword and replaces the map fd with a real pointer internally. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/libbpf.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
index 58c5fe1bdba1..a6bb7e9c22c3 100644
--- a/samples/bpf/libbpf.h
+++ b/samples/bpf/libbpf.h
@@ -92,7 +92,9 @@ extern char bpf_log_buf[LOG_BUF_SIZE];
.off = 0, \
.imm = ((__u64) (IMM)) >> 32 })
-#define BPF_PSEUDO_MAP_FD 1
+#ifndef BPF_PSEUDO_MAP_FD
+# define BPF_PSEUDO_MAP_FD 1
+#endif
/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
#define BPF_LD_MAP_FD(DST, MAP_FD) \