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tools: libbpf: expose the prog type guessing from section name logic

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libbpf can guess program type based on ELF section names.  As libbpf
becomes more popular its association between section name strings and
types becomes more of a standard.  Allow libbpf users to use the same
logic for matching strings to types, e.g. when the string originates
from command line.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-07-10 14:42:59 -07:00 committed by Daniel Borkmann
parent ba6dd679a3
commit b60df2a0e1
2 changed files with 28 additions and 18 deletions
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43
tools/lib/bpf/libbpf.c
View File

@ -2081,23 +2081,31 @@ static const struct {
#undef BPF_S_PROG_SEC
#undef BPF_SA_PROG_SEC
static int bpf_program__identify_section(struct bpf_program *prog)
int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
enum bpf_attach_type *expected_attach_type)
{
int i;
if (!prog->section_name)
goto err;
if (!name)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(section_names); i++)
if (strncmp(prog->section_name, section_names[i].sec,
section_names[i].len) == 0)
return i;
for (i = 0; i < ARRAY_SIZE(section_names); i++) {
if (strncmp(name, section_names[i].sec, section_names[i].len))
continue;
*prog_type = section_names[i].prog_type;
*expected_attach_type = section_names[i].expected_attach_type;
return 0;
}
return -EINVAL;
}
err:
pr_warning("failed to guess program type based on section name %s\n",
prog->section_name);
return -1;
static int
bpf_program__identify_section(struct bpf_program *prog,
enum bpf_prog_type *prog_type,
enum bpf_attach_type *expected_attach_type)
{
return libbpf_prog_type_by_name(prog->section_name, prog_type,
expected_attach_type);
}
int bpf_map__fd(struct bpf_map *map)
@ -2230,7 +2238,6 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
enum bpf_prog_type prog_type;
struct bpf_object *obj;
struct bpf_map *map;
int section_idx;
int err;
if (!attr)
@ -2252,14 +2259,14 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
prog->prog_ifindex = attr->ifindex;
expected_attach_type = attr->expected_attach_type;
if (prog_type == BPF_PROG_TYPE_UNSPEC) {
section_idx = bpf_program__identify_section(prog);
if (section_idx < 0) {
err = bpf_program__identify_section(prog, &prog_type,
&expected_attach_type);
if (err < 0) {
pr_warning("failed to guess program type based on section name %s\n",
prog->section_name);
bpf_object__close(obj);
return -EINVAL;
}
prog_type = section_names[section_idx].prog_type;
expected_attach_type =
section_names[section_idx].expected_attach_type;
}
bpf_program__set_type(prog, prog_type);

3
tools/lib/bpf/libbpf.h
View File

@ -92,6 +92,9 @@ int bpf_object__set_priv(struct bpf_object *obj, void *priv,
bpf_object_clear_priv_t clear_priv);
void *bpf_object__priv(struct bpf_object *prog);
int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
enum bpf_attach_type *expected_attach_type);
/* Accessors of bpf_program */
struct bpf_program;
struct bpf_program *bpf_program__next(struct bpf_program *prog,