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libbpf: Add support for field existance CO-RE relocation

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Add support for BPF_FRK_EXISTS relocation kind to detect existence of
captured field in a destination BTF, allowing conditional logic to
handle incompatible differences between kernels.

Also introduce opt-in relaxed CO-RE relocation handling option, which
makes libbpf emit warning for failed relocations, but proceed with other
relocations. Instruction, for which relocation failed, is patched with
(u32)-1 value.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191015182849.3922287-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-10-15 11:28:47 -07:00
committed by Andrii Nakryiko
parent 807b9d7be1
commit 0db22b01a1
2 changed files with 61 additions and 17 deletions
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4
src/libbpf.h
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@@ -96,8 +96,10 @@ struct bpf_object_open_opts {
const char *object_name;
/* parse map definitions non-strictly, allowing extra attributes/data */
bool relaxed_maps;
/* process CO-RE relocations non-strictly, allowing them to fail */
bool relaxed_core_relocs;
};
#define bpf_object_open_opts__last_field relaxed_maps
#define bpf_object_open_opts__last_field relaxed_core_relocs
LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
LIBBPF_API struct bpf_object *