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libbpf: Deprecate notion of BPF program "title" in favor of "section name"

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BPF program title is ambigious and misleading term. It is ELF section name, so
let's just call it that and deprecate bpf_program__title() API in favor of
bpf_program__section_name().

Additionally, using bpf_object__find_program_by_title() is now inherently
dangerous and ambiguous, as multiple BPF program can have the same section
name. So deprecate this API as well and recommend to switch to non-ambiguous
bpf_object__find_program_by_name().

Internally, clean up usage and mis-usage of BPF program section name for
denoting BPF program name. Shorten the field name to prog->sec_name to be
consistent with all other prog->sec_* variables.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200903203542.15944-11-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-09-03 13:35:38 -07:00 committed by Alexei Starovoitov
parent a7659cc30b
commit 5210958420
3 changed files with 101 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

215
tools/lib/bpf/libbpf.c
View File

@ -217,7 +217,7 @@ struct bpf_sec_def {
*/
struct bpf_program {
const struct bpf_sec_def *sec_def;
char *section_name;
char *sec_name;
size_t sec_idx;
/* this program's instruction offset (in number of instructions)
* within its containing ELF section
@ -239,7 +239,7 @@ struct bpf_program {
size_t sub_insn_off;
char *name;
/* section_name with / replaced by _; makes recursive pinning
/* sec_name with / replaced by _; makes recursive pinning
* in bpf_object__pin_programs easier
*/
char *pin_name;
@ -515,7 +515,7 @@ static void bpf_program__exit(struct bpf_program *prog)
bpf_program__unload(prog);
zfree(&prog->name);
zfree(&prog->section_name);
zfree(&prog->sec_name);
zfree(&prog->pin_name);
zfree(&prog->insns);
zfree(&prog->reloc_desc);
@ -529,7 +529,7 @@ static char *__bpf_program__pin_name(struct bpf_program *prog)
{
char *name, *p;
name = p = strdup(prog->section_name);
name = p = strdup(prog->sec_name);
while ((p = strchr(p, '/')))
*p = '_';
@ -574,8 +574,8 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
prog->instances.fds = NULL;
prog->instances.nr = -1;
prog->section_name = strdup(sec_name);
if (!prog->section_name)
prog->sec_name = strdup(sec_name);
if (!prog->sec_name)
goto errout;
prog->name = strdup(name);
@ -3254,7 +3254,7 @@ bpf_object__find_program_by_title(const struct bpf_object *obj,
struct bpf_program *pos;
bpf_object__for_each_program(pos, obj) {
if (pos->section_name && !strcmp(pos->section_name, title))
if (pos->sec_name && !strcmp(pos->sec_name, title))
return pos;
}
return NULL;
@ -4994,8 +4994,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog,
*val = sz;
} else {
pr_warn("prog '%s': relo %d at insn #%d can't be applied to array access\n",
bpf_program__title(prog, false),
relo->kind, relo->insn_off / 8);
prog->name, relo->kind, relo->insn_off / 8);
return -EINVAL;
}
if (validate)
@ -5017,8 +5016,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog,
if (byte_sz >= 8) {
/* bitfield can't be read with 64-bit read */
pr_warn("prog '%s': relo %d at insn #%d can't be satisfied for bitfield\n",
bpf_program__title(prog, false),
relo->kind, relo->insn_off / 8);
prog->name, relo->kind, relo->insn_off / 8);
return -E2BIG;
}
byte_sz *= 2;
@ -5183,8 +5181,8 @@ static int bpf_core_calc_relo(const struct bpf_program *prog,
} else if (err == -EOPNOTSUPP) {
/* EOPNOTSUPP means unknown/unsupported relocation */
pr_warn("prog '%s': relo #%d: unrecognized CO-RE relocation %s (%d) at insn #%d\n",
bpf_program__title(prog, false), relo_idx,
core_relo_kind_str(relo->kind), relo->kind, relo->insn_off / 8);
prog->name, relo_idx, core_relo_kind_str(relo->kind),
relo->kind, relo->insn_off / 8);
}
return err;
@ -5198,7 +5196,7 @@ static void bpf_core_poison_insn(struct bpf_program *prog, int relo_idx,
int insn_idx, struct bpf_insn *insn)
{
pr_debug("prog '%s': relo #%d: substituting insn #%d w/ invalid insn\n",
bpf_program__title(prog, false), relo_idx, insn_idx);
prog->name, relo_idx, insn_idx);
insn->code = BPF_JMP | BPF_CALL;
insn->dst_reg = 0;
insn->src_reg = 0;
@ -5270,14 +5268,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
return -EINVAL;
if (res->validate && insn->imm != orig_val) {
pr_warn("prog '%s': relo #%d: unexpected insn #%d (ALU/ALU64) value: got %u, exp %u -> %u\n",
bpf_program__title(prog, false), relo_idx,
prog->name, relo_idx,
insn_idx, insn->imm, orig_val, new_val);
return -EINVAL;
}
orig_val = insn->imm;
insn->imm = new_val;
pr_debug("prog '%s': relo #%d: patched insn #%d (ALU/ALU64) imm %u -> %u\n",
bpf_program__title(prog, false), relo_idx, insn_idx,
prog->name, relo_idx, insn_idx,
orig_val, new_val);
break;
case BPF_LDX:
@ -5285,21 +5283,18 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
case BPF_STX:
if (res->validate && insn->off != orig_val) {
pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDX/ST/STX) value: got %u, exp %u -> %u\n",
bpf_program__title(prog, false), relo_idx,
insn_idx, insn->off, orig_val, new_val);
prog->name, relo_idx, insn_idx, insn->off, orig_val, new_val);
return -EINVAL;
}
if (new_val > SHRT_MAX) {
pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) value too big: %u\n",
bpf_program__title(prog, false), relo_idx,
insn_idx, new_val);
prog->name, relo_idx, insn_idx, new_val);
return -ERANGE;
}
orig_val = insn->off;
insn->off = new_val;
pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) off %u -> %u\n",
bpf_program__title(prog, false), relo_idx, insn_idx,
orig_val, new_val);
prog->name, relo_idx, insn_idx, orig_val, new_val);
break;
case BPF_LD: {
__u64 imm;
@ -5310,14 +5305,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
insn[1].code != 0 || insn[1].dst_reg != 0 ||
insn[1].src_reg != 0 || insn[1].off != 0) {
pr_warn("prog '%s': relo #%d: insn #%d (LDIMM64) has unexpected form\n",
bpf_program__title(prog, false), relo_idx, insn_idx);
prog->name, relo_idx, insn_idx);
return -EINVAL;
}
imm = insn[0].imm + ((__u64)insn[1].imm << 32);
if (res->validate && imm != orig_val) {
pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDIMM64) value: got %llu, exp %u -> %u\n",
bpf_program__title(prog, false), relo_idx,
prog->name, relo_idx,
insn_idx, (unsigned long long)imm,
orig_val, new_val);
return -EINVAL;
@ -5326,15 +5321,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
insn[0].imm = new_val;
insn[1].imm = 0; /* currently only 32-bit values are supported */
pr_debug("prog '%s': relo #%d: patched insn #%d (LDIMM64) imm64 %llu -> %u\n",
bpf_program__title(prog, false), relo_idx, insn_idx,
prog->name, relo_idx, insn_idx,
(unsigned long long)imm, new_val);
break;
}
default:
pr_warn("prog '%s': relo #%d: trying to relocate unrecognized insn #%d, code:0x%x, src:0x%x, dst:0x%x, off:0x%x, imm:0x%x\n",
bpf_program__title(prog, false), relo_idx,
insn_idx, insn->code, insn->src_reg, insn->dst_reg,
insn->off, insn->imm);
prog->name, relo_idx, insn_idx, insn->code,
insn->src_reg, insn->dst_reg, insn->off, insn->imm);
return -EINVAL;
}
@ -5464,7 +5458,6 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
const struct btf *targ_btf,
struct hashmap *cand_cache)
{
const char *prog_name = bpf_program__title(prog, false);
struct bpf_core_spec local_spec, cand_spec, targ_spec = {};
const void *type_key = u32_as_hash_key(relo->type_id);
struct bpf_core_relo_res cand_res, targ_res;
@ -5491,13 +5484,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
err = bpf_core_parse_spec(local_btf, local_id, spec_str, relo->kind, &local_spec);
if (err) {
pr_warn("prog '%s': relo #%d: parsing [%d] %s %s + %s failed: %d\n",
prog_name, relo_idx, local_id, btf_kind_str(local_type),
prog->name, relo_idx, local_id, btf_kind_str(local_type),
str_is_empty(local_name) ? "<anon>" : local_name,
spec_str, err);
return -EINVAL;
}
pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog_name,
pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog->name,
relo_idx, core_relo_kind_str(relo->kind), relo->kind);
bpf_core_dump_spec(LIBBPF_DEBUG, &local_spec);
libbpf_print(LIBBPF_DEBUG, "\n");
@ -5514,7 +5507,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
/* libbpf doesn't support candidate search for anonymous types */
if (str_is_empty(spec_str)) {
pr_warn("prog '%s': relo #%d: <%s> (%d) relocation doesn't support anonymous types\n",
prog_name, relo_idx, core_relo_kind_str(relo->kind), relo->kind);
prog->name, relo_idx, core_relo_kind_str(relo->kind), relo->kind);
return -EOPNOTSUPP;
}
@ -5522,7 +5515,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
cand_ids = bpf_core_find_cands(local_btf, local_id, targ_btf);
if (IS_ERR(cand_ids)) {
pr_warn("prog '%s': relo #%d: target candidate search failed for [%d] %s %s: %ld",
prog_name, relo_idx, local_id, btf_kind_str(local_type),
prog->name, relo_idx, local_id, btf_kind_str(local_type),
local_name, PTR_ERR(cand_ids));
return PTR_ERR(cand_ids);
}
@ -5538,13 +5531,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
err = bpf_core_spec_match(&local_spec, targ_btf, cand_id, &cand_spec);
if (err < 0) {
pr_warn("prog '%s': relo #%d: error matching candidate #%d ",
prog_name, relo_idx, i);
prog->name, relo_idx, i);
bpf_core_dump_spec(LIBBPF_WARN, &cand_spec);
libbpf_print(LIBBPF_WARN, ": %d\n", err);
return err;
}
pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog_name,
pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog->name,
relo_idx, err == 0 ? "non-matching" : "matching", i);
bpf_core_dump_spec(LIBBPF_DEBUG, &cand_spec);
libbpf_print(LIBBPF_DEBUG, "\n");
@ -5564,7 +5557,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
* should all resolve to the same bit offset
*/
pr_warn("prog '%s': relo #%d: field offset ambiguity: %u != %u\n",
prog_name, relo_idx, cand_spec.bit_offset,
prog->name, relo_idx, cand_spec.bit_offset,
targ_spec.bit_offset);
return -EINVAL;
} else if (cand_res.poison != targ_res.poison || cand_res.new_val != targ_res.new_val) {
@ -5573,7 +5566,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
* proceed due to ambiguity
*/
pr_warn("prog '%s': relo #%d: relocation decision ambiguity: %s %u != %s %u\n",
prog_name, relo_idx,
prog->name, relo_idx,
cand_res.poison ? "failure" : "success", cand_res.new_val,
targ_res.poison ? "failure" : "success", targ_res.new_val);
return -EINVAL;
@ -5606,7 +5599,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
*/
if (j == 0) {
pr_debug("prog '%s': relo #%d: no matching targets found\n",
prog_name, relo_idx);
prog->name, relo_idx);
/* calculate single target relo result explicitly */
err = bpf_core_calc_relo(prog, relo, relo_idx, &local_spec, NULL, &targ_res);
@ -5619,7 +5612,7 @@ patch_insn:
err = bpf_core_patch_insn(prog, relo, relo_idx, &targ_res);
if (err) {
pr_warn("prog '%s': relo #%d: failed to patch insn at offset %d: %d\n",
prog_name, relo_idx, relo->insn_off, err);
prog->name, relo_idx, relo->insn_off, err);
return -EINVAL;
}
@ -5673,7 +5666,7 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path)
prog = NULL;
for (i = 0; i < obj->nr_programs; i++) {
prog = &obj->programs[i];
if (strcmp(prog->section_name, sec_name) == 0)
if (strcmp(prog->sec_name, sec_name) == 0)
break;
}
if (!prog) {
@ -5787,7 +5780,7 @@ static int adjust_prog_btf_ext_info(const struct bpf_object *obj,
sec_name = btf__name_by_offset(obj->btf, sec->sec_name_off);
if (!sec_name)
return -EINVAL;
if (strcmp(sec_name, prog->section_name) != 0)
if (strcmp(sec_name, prog->sec_name) != 0)
continue;
for_each_btf_ext_rec(ext_info, sec, i, rec) {
@ -6527,8 +6520,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
int err = 0, fd, i, btf_id;
if (prog->obj->loaded) {
pr_warn("prog '%s'('%s'): can't load after object was loaded\n",
prog->name, prog->section_name);
pr_warn("prog '%s': can't load after object was loaded\n", prog->name);
return -EINVAL;
}
@ -6544,7 +6536,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
if (prog->instances.nr < 0 || !prog->instances.fds) {
if (prog->preprocessor) {
pr_warn("Internal error: can't load program '%s'\n",
prog->section_name);
prog->name);
return -LIBBPF_ERRNO__INTERNAL;
}
@ -6559,8 +6551,8 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
if (!prog->preprocessor) {
if (prog->instances.nr != 1) {
pr_warn("Program '%s' is inconsistent: nr(%d) != 1\n",
prog->section_name, prog->instances.nr);
pr_warn("prog '%s': inconsistent nr(%d) != 1\n",
prog->name, prog->instances.nr);
}
err = load_program(prog, prog->insns, prog->insns_cnt,
license, kern_ver, &fd);
@ -6578,13 +6570,13 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
prog->insns_cnt, &result);
if (err) {
pr_warn("Preprocessing the %dth instance of program '%s' failed\n",
i, prog->section_name);
i, prog->name);
goto out;
}
if (!result.new_insn_ptr || !result.new_insn_cnt) {
pr_debug("Skip loading the %dth instance of program '%s'\n",
i, prog->section_name);
i, prog->name);
prog->instances.fds[i] = -1;
if (result.pfd)
*result.pfd = -1;
@ -6595,7 +6587,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
result.new_insn_cnt, license, kern_ver, &fd);
if (err) {
pr_warn("Loading the %dth instance of program '%s' failed\n",
i, prog->section_name);
i, prog->name);
goto out;
}
@ -6605,7 +6597,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
}
out:
if (err)
pr_warn("failed to load program '%s'\n", prog->section_name);
pr_warn("failed to load program '%s'\n", prog->name);
zfree(&prog->insns);
prog->insns_cnt = 0;
return err;
@ -6697,7 +6689,7 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz,
bpf_object__elf_finish(obj);
bpf_object__for_each_program(prog, obj) {
prog->sec_def = find_sec_def(prog->section_name);
prog->sec_def = find_sec_def(prog->sec_name);
if (!prog->sec_def)
/* couldn't guess, but user might manually specify */
continue;
@ -7078,7 +7070,7 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
if (instance < 0 || instance >= prog->instances.nr) {
pr_warn("invalid prog instance %d of prog %s (max %d)\n",
instance, prog->section_name, prog->instances.nr);
instance, prog->name, prog->instances.nr);
return -EINVAL;
}
@ -7109,7 +7101,7 @@ int bpf_program__unpin_instance(struct bpf_program *prog, const char *path,
if (instance < 0 || instance >= prog->instances.nr) {
pr_warn("invalid prog instance %d of prog %s (max %d)\n",
instance, prog->section_name, prog->instances.nr);
instance, prog->name, prog->instances.nr);
return -EINVAL;
}
@ -7139,8 +7131,7 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
}
if (prog->instances.nr <= 0) {
pr_warn("no instances of prog %s to pin\n",
prog->section_name);
pr_warn("no instances of prog %s to pin\n", prog->name);
return -EINVAL;
}
@ -7202,8 +7193,7 @@ int bpf_program__unpin(struct bpf_program *prog, const char *path)
}
if (prog->instances.nr <= 0) {
pr_warn("no instances of prog %s to pin\n",
prog->section_name);
pr_warn("no instances of prog %s to pin\n", prog->name);
return -EINVAL;
}
@ -7738,11 +7728,16 @@ const char *bpf_program__name(const struct bpf_program *prog)
return prog->name;
}
const char *bpf_program__section_name(const struct bpf_program *prog)
{
return prog->sec_name;
}
const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy)
{
const char *title;
title = prog->section_name;
title = prog->sec_name;
if (needs_copy) {
title = strdup(title);
if (!title) {
@ -7815,14 +7810,14 @@ int bpf_program__nth_fd(const struct bpf_program *prog, int n)
if (n >= prog->instances.nr || n < 0) {
pr_warn("Can't get the %dth fd from program %s: only %d instances\n",
n, prog->section_name, prog->instances.nr);
n, prog->name, prog->instances.nr);
return -EINVAL;
}
fd = prog->instances.fds[n];
if (fd < 0) {
pr_warn("%dth instance of program '%s' is invalid\n",
n, prog->section_name);
n, prog->name);
return -ENOENT;
}
@ -8259,7 +8254,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj,
if (prog->type == BPF_PROG_TYPE_UNSPEC) {
const struct bpf_sec_def *sec_def;
sec_def = find_sec_def(prog->section_name);
sec_def = find_sec_def(prog->sec_name);
if (sec_def &&
sec_def->prog_type != BPF_PROG_TYPE_STRUCT_OPS) {
/* for pr_warn */
@ -8282,7 +8277,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj,
invalid_prog:
pr_warn("struct_ops reloc %s: cannot use prog %s in sec %s with type %u attach_btf_id %u expected_attach_type %u for func ptr %s\n",
map->name, prog->name, prog->section_name, prog->type,
map->name, prog->name, prog->sec_name, prog->type,
prog->attach_btf_id, prog->expected_attach_type, name);
return -EINVAL;
}
@ -8386,7 +8381,7 @@ static int libbpf_find_attach_btf_id(struct bpf_program *prog)
{
enum bpf_attach_type attach_type = prog->expected_attach_type;
__u32 attach_prog_fd = prog->attach_prog_fd;
const char *name = prog->section_name;
const char *name = prog->sec_name;
int i, err;
if (!name)
@ -8913,14 +8908,14 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog,
int prog_fd, err;
if (pfd < 0) {
pr_warn("program '%s': invalid perf event FD %d\n",
bpf_program__title(prog, false), pfd);
pr_warn("prog '%s': invalid perf event FD %d\n",
prog->name, pfd);
return ERR_PTR(-EINVAL);
}
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("program '%s': can't attach BPF program w/o FD (did you load it?)\n",
bpf_program__title(prog, false));
pr_warn("prog '%s': can't attach BPF program w/o FD (did you load it?)\n",
prog->name);
return ERR_PTR(-EINVAL);
}
@ -8933,20 +8928,18 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog,
if (ioctl(pfd, PERF_EVENT_IOC_SET_BPF, prog_fd) < 0) {
err = -errno;
free(link);
pr_warn("program '%s': failed to attach to pfd %d: %s\n",
bpf_program__title(prog, false), pfd,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
pr_warn("prog '%s': failed to attach to pfd %d: %s\n",
prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
if (err == -EPROTO)
pr_warn("program '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n",
bpf_program__title(prog, false), pfd);
pr_warn("prog '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n",
prog->name, pfd);
return ERR_PTR(err);
}
if (ioctl(pfd, PERF_EVENT_IOC_ENABLE, 0) < 0) {
err = -errno;
free(link);
pr_warn("program '%s': failed to enable pfd %d: %s\n",
bpf_program__title(prog, false), pfd,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
pr_warn("prog '%s': failed to enable pfd %d: %s\n",
prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return ERR_PTR(err);
}
return link;
@ -9068,9 +9061,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
pfd = perf_event_open_probe(false /* uprobe */, retprobe, func_name,
0 /* offset */, -1 /* pid */);
if (pfd < 0) {
pr_warn("program '%s': failed to create %s '%s' perf event: %s\n",
bpf_program__title(prog, false),
retprobe ? "kretprobe" : "kprobe", func_name,
pr_warn("prog '%s': failed to create %s '%s' perf event: %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return ERR_PTR(pfd);
}
@ -9078,9 +9070,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
if (IS_ERR(link)) {
close(pfd);
err = PTR_ERR(link);
pr_warn("program '%s': failed to attach to %s '%s': %s\n",
bpf_program__title(prog, false),
retprobe ? "kretprobe" : "kprobe", func_name,
pr_warn("prog '%s': failed to attach to %s '%s': %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return link;
}
@ -9093,7 +9084,7 @@ static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec,
const char *func_name;
bool retprobe;
func_name = bpf_program__title(prog, false) + sec->len;
func_name = prog->sec_name + sec->len;
retprobe = strcmp(sec->sec, "kretprobe/") == 0;
return bpf_program__attach_kprobe(prog, retprobe, func_name);
@ -9111,9 +9102,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog,
pfd = perf_event_open_probe(true /* uprobe */, retprobe,
binary_path, func_offset, pid);
if (pfd < 0) {
pr_warn("program '%s': failed to create %s '%s:0x%zx' perf event: %s\n",
bpf_program__title(prog, false),
retprobe ? "uretprobe" : "uprobe",
pr_warn("prog '%s': failed to create %s '%s:0x%zx' perf event: %s\n",
prog->name, retprobe ? "uretprobe" : "uprobe",
binary_path, func_offset,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return ERR_PTR(pfd);
@ -9122,9 +9112,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog,
if (IS_ERR(link)) {
close(pfd);
err = PTR_ERR(link);
pr_warn("program '%s': failed to attach to %s '%s:0x%zx': %s\n",
bpf_program__title(prog, false),
retprobe ? "uretprobe" : "uprobe",
pr_warn("prog '%s': failed to attach to %s '%s:0x%zx': %s\n",
prog->name, retprobe ? "uretprobe" : "uprobe",
binary_path, func_offset,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return link;
@ -9192,9 +9181,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog,
pfd = perf_event_open_tracepoint(tp_category, tp_name);
if (pfd < 0) {
pr_warn("program '%s': failed to create tracepoint '%s/%s' perf event: %s\n",
bpf_program__title(prog, false),
tp_category, tp_name,
pr_warn("prog '%s': failed to create tracepoint '%s/%s' perf event: %s\n",
prog->name, tp_category, tp_name,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return ERR_PTR(pfd);
}
@ -9202,9 +9190,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog,
if (IS_ERR(link)) {
close(pfd);
err = PTR_ERR(link);
pr_warn("program '%s': failed to attach to tracepoint '%s/%s': %s\n",
bpf_program__title(prog, false),
tp_category, tp_name,
pr_warn("prog '%s': failed to attach to tracepoint '%s/%s': %s\n",
prog->name, tp_category, tp_name,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return link;
}
@ -9217,7 +9204,7 @@ static struct bpf_link *attach_tp(const struct bpf_sec_def *sec,
char *sec_name, *tp_cat, *tp_name;
struct bpf_link *link;
sec_name = strdup(bpf_program__title(prog, false));
sec_name = strdup(prog->sec_name);
if (!sec_name)
return ERR_PTR(-ENOMEM);
@ -9246,8 +9233,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("program '%s': can't attach before loaded\n",
bpf_program__title(prog, false));
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
return ERR_PTR(-EINVAL);
}
@ -9260,9 +9246,8 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
if (pfd < 0) {
pfd = -errno;
free(link);
pr_warn("program '%s': failed to attach to raw tracepoint '%s': %s\n",
bpf_program__title(prog, false), tp_name,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
pr_warn("prog '%s': failed to attach to raw tracepoint '%s': %s\n",
prog->name, tp_name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return ERR_PTR(pfd);
}
link->fd = pfd;
@ -9272,7 +9257,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
static struct bpf_link *attach_raw_tp(const struct bpf_sec_def *sec,
struct bpf_program *prog)
{
const char *tp_name = bpf_program__title(prog, false) + sec->len;
const char *tp_name = prog->sec_name + sec->len;
return bpf_program__attach_raw_tracepoint(prog, tp_name);
}
@ -9286,8 +9271,7 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog)
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("program '%s': can't attach before loaded\n",
bpf_program__title(prog, false));
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
return ERR_PTR(-EINVAL);
}
@ -9300,9 +9284,8 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog)
if (pfd < 0) {
pfd = -errno;
free(link);
pr_warn("program '%s': failed to attach: %s\n",
bpf_program__title(prog, false),
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
pr_warn("prog '%s': failed to attach: %s\n",
prog->name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return ERR_PTR(pfd);
}
link->fd = pfd;
@ -9348,8 +9331,7 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd,
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("program '%s': can't attach before loaded\n",
bpf_program__title(prog, false));
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
return ERR_PTR(-EINVAL);
}
@ -9363,8 +9345,8 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd,
if (link_fd < 0) {
link_fd = -errno;
free(link);
pr_warn("program '%s': failed to attach to %s: %s\n",
bpf_program__title(prog, false), target_name,
pr_warn("prog '%s': failed to attach to %s: %s\n",
prog->name, target_name,
libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
return ERR_PTR(link_fd);
}
@ -9408,8 +9390,7 @@ bpf_program__attach_iter(struct bpf_program *prog,
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("program '%s': can't attach before loaded\n",
bpf_program__title(prog, false));
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
return ERR_PTR(-EINVAL);
}
@ -9423,9 +9404,8 @@ bpf_program__attach_iter(struct bpf_program *prog,
if (link_fd < 0) {
link_fd = -errno;
free(link);
pr_warn("program '%s': failed to attach to iterator: %s\n",
bpf_program__title(prog, false),
libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
pr_warn("prog '%s': failed to attach to iterator: %s\n",
prog->name, libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
return ERR_PTR(link_fd);
}
link->fd = link_fd;
@ -9436,7 +9416,7 @@ struct bpf_link *bpf_program__attach(struct bpf_program *prog)
{
const struct bpf_sec_def *sec_def;
sec_def = find_sec_def(bpf_program__title(prog, false));
sec_def = find_sec_def(prog->sec_name);
if (!sec_def || !sec_def->attach_fn)
return ERR_PTR(-ESRCH);
@ -10506,12 +10486,11 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s)
struct bpf_program *prog = *s->progs[i].prog;
struct bpf_link **link = s->progs[i].link;
const struct bpf_sec_def *sec_def;
const char *sec_name = bpf_program__title(prog, false);
if (!prog->load)
continue;
sec_def = find_sec_def(sec_name);
sec_def = find_sec_def(prog->sec_name);
if (!sec_def || !sec_def->attach_fn)
continue;

5
tools/lib/bpf/libbpf.h
View File

@ -198,8 +198,9 @@ LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
__u32 ifindex);
LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog);
LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
bool needs_copy);
LIBBPF_API const char *bpf_program__section_name(const struct bpf_program *prog);
LIBBPF_API LIBBPF_DEPRECATED("BPF program title is confusing term; please use bpf_program__section_name() instead")
const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy);
LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog);
LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload);

1
tools/lib/bpf/libbpf.map
View File

@ -302,6 +302,7 @@ LIBBPF_0.1.0 {
LIBBPF_0.2.0 {
global:
bpf_program__section_name;
perf_buffer__buffer_cnt;
perf_buffer__buffer_fd;
perf_buffer__epoll_fd;