summaryrefslogtreecommitdiff
path: root/tools/lib/bpf
diff options
context:
space:
mode:
Diffstat (limited to 'tools/lib/bpf')
-rw-r--r--tools/lib/bpf/Build2
-rw-r--r--tools/lib/bpf/Makefile6
-rw-r--r--tools/lib/bpf/libbpf.c188
-rw-r--r--tools/lib/bpf/libbpf.h11
-rw-r--r--tools/lib/bpf/libbpf_errno.c74
5 files changed, 202 insertions, 79 deletions
diff --git a/tools/lib/bpf/Build b/tools/lib/bpf/Build
index 6070e655042d..13a861135127 100644
--- a/tools/lib/bpf/Build
+++ b/tools/lib/bpf/Build
@@ -1 +1 @@
-libbpf-y := libbpf.o bpf.o nlattr.o btf.o
+libbpf-y := libbpf.o bpf.o nlattr.o btf.o libbpf_errno.o
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 5390e7725e43..7a8e4c98ef1a 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -66,7 +66,7 @@ ifndef VERBOSE
endif
FEATURE_USER = .libbpf
-FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
+FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf reallocarray
FEATURE_DISPLAY = libelf bpf
INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi -I$(srctree)/tools/perf
@@ -120,6 +120,10 @@ ifeq ($(feature-libelf-getphdrnum), 1)
override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
endif
+ifeq ($(feature-reallocarray), 0)
+ override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
+endif
+
# Append required CFLAGS
override CFLAGS += $(EXTRA_WARNINGS)
override CFLAGS += -Werror -Wall
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 38ed3e92e393..955f8eafbf41 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -22,6 +22,7 @@
* License along with this program; if not, see <http://www.gnu.org/licenses>
*/
+#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
@@ -41,6 +42,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
+#include <tools/libc_compat.h>
#include <libelf.h>
#include <gelf.h>
@@ -95,54 +97,6 @@ void libbpf_set_print(libbpf_print_fn_t warn,
#define STRERR_BUFSIZE 128
-#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
-#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
-#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
-
-static const char *libbpf_strerror_table[NR_ERRNO] = {
- [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
- [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
- [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
- [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
- [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
- [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
- [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
- [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
- [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
- [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
- [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
- [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
-};
-
-int libbpf_strerror(int err, char *buf, size_t size)
-{
- if (!buf || !size)
- return -1;
-
- err = err > 0 ? err : -err;
-
- if (err < __LIBBPF_ERRNO__START) {
- int ret;
-
- ret = strerror_r(err, buf, size);
- buf[size - 1] = '\0';
- return ret;
- }
-
- if (err < __LIBBPF_ERRNO__END) {
- const char *msg;
-
- msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
- snprintf(buf, size, "%s", msg);
- buf[size - 1] = '\0';
- return 0;
- }
-
- snprintf(buf, size, "Unknown libbpf error %d", err);
- buf[size - 1] = '\0';
- return -1;
-}
-
#define CHECK_ERR(action, err, out) do { \
err = action; \
if (err) \
@@ -369,7 +323,7 @@ bpf_object__add_program(struct bpf_object *obj, void *data, size_t size,
progs = obj->programs;
nr_progs = obj->nr_programs;
- progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1));
+ progs = reallocarray(progs, nr_progs + 1, sizeof(progs[0]));
if (!progs) {
/*
* In this case the original obj->programs
@@ -870,8 +824,8 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
continue;
}
- reloc = realloc(reloc,
- sizeof(*obj->efile.reloc) * nr_reloc);
+ reloc = reallocarray(reloc, nr_reloc,
+ sizeof(*obj->efile.reloc));
if (!reloc) {
pr_warning("realloc failed\n");
err = -ENOMEM;
@@ -1081,6 +1035,53 @@ static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
return 0;
}
+int bpf_map__reuse_fd(struct bpf_map *map, int fd)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ int new_fd, err;
+ char *new_name;
+
+ err = bpf_obj_get_info_by_fd(fd, &info, &len);
+ if (err)
+ return err;
+
+ new_name = strdup(info.name);
+ if (!new_name)
+ return -errno;
+
+ new_fd = open("/", O_RDONLY | O_CLOEXEC);
+ if (new_fd < 0)
+ goto err_free_new_name;
+
+ new_fd = dup3(fd, new_fd, O_CLOEXEC);
+ if (new_fd < 0)
+ goto err_close_new_fd;
+
+ err = zclose(map->fd);
+ if (err)
+ goto err_close_new_fd;
+ free(map->name);
+
+ map->fd = new_fd;
+ map->name = new_name;
+ map->def.type = info.type;
+ map->def.key_size = info.key_size;
+ map->def.value_size = info.value_size;
+ map->def.max_entries = info.max_entries;
+ map->def.map_flags = info.map_flags;
+ map->btf_key_type_id = info.btf_key_type_id;
+ map->btf_value_type_id = info.btf_value_type_id;
+
+ return 0;
+
+err_close_new_fd:
+ close(new_fd);
+err_free_new_name:
+ free(new_name);
+ return -errno;
+}
+
static int
bpf_object__create_maps(struct bpf_object *obj)
{
@@ -1093,6 +1094,12 @@ bpf_object__create_maps(struct bpf_object *obj)
struct bpf_map_def *def = &map->def;
int *pfd = &map->fd;
+ if (map->fd >= 0) {
+ pr_debug("skip map create (preset) %s: fd=%d\n",
+ map->name, map->fd);
+ continue;
+ }
+
create_attr.name = map->name;
create_attr.map_ifindex = map->map_ifindex;
create_attr.map_type = def->type;
@@ -1163,7 +1170,7 @@ bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj,
return -LIBBPF_ERRNO__RELOC;
}
new_cnt = prog->insns_cnt + text->insns_cnt;
- new_insn = realloc(prog->insns, new_cnt * sizeof(*insn));
+ new_insn = reallocarray(prog->insns, new_cnt, sizeof(*insn));
if (!new_insn) {
pr_warning("oom in prog realloc\n");
return -ENOMEM;
@@ -1520,15 +1527,26 @@ out:
return ERR_PTR(err);
}
-struct bpf_object *bpf_object__open(const char *path)
+struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr)
{
/* param validation */
- if (!path)
+ if (!attr->file)
return NULL;
- pr_debug("loading %s\n", path);
+ pr_debug("loading %s\n", attr->file);
+
+ return __bpf_object__open(attr->file, NULL, 0,
+ bpf_prog_type__needs_kver(attr->prog_type));
+}
+
+struct bpf_object *bpf_object__open(const char *path)
+{
+ struct bpf_object_open_attr attr = {
+ .file = path,
+ .prog_type = BPF_PROG_TYPE_UNSPEC,
+ };
- return __bpf_object__open(path, NULL, 0, true);
+ return bpf_object__open_xattr(&attr);
}
struct bpf_object *bpf_object__open_buffer(void *obj_buf,
@@ -2081,23 +2099,31 @@ 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;
-
- 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;
+ if (!name)
+ return -EINVAL;
-err:
- pr_warning("failed to guess program type based on section name %s\n",
- prog->section_name);
+ 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;
+}
- 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)
@@ -2146,6 +2172,11 @@ void *bpf_map__priv(struct bpf_map *map)
return map ? map->priv : ERR_PTR(-EINVAL);
}
+bool bpf_map__is_offload_neutral(struct bpf_map *map)
+{
+ return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
+}
+
void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex)
{
map->map_ifindex = ifindex;
@@ -2225,12 +2256,15 @@ int bpf_prog_load(const char *file, enum bpf_prog_type type,
int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
struct bpf_object **pobj, int *prog_fd)
{
+ struct bpf_object_open_attr open_attr = {
+ .file = attr->file,
+ .prog_type = attr->prog_type,
+ };
struct bpf_program *prog, *first_prog = NULL;
enum bpf_attach_type expected_attach_type;
enum bpf_prog_type prog_type;
struct bpf_object *obj;
struct bpf_map *map;
- int section_idx;
int err;
if (!attr)
@@ -2238,8 +2272,7 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
if (!attr->file)
return -EINVAL;
- obj = __bpf_object__open(attr->file, NULL, 0,
- bpf_prog_type__needs_kver(attr->prog_type));
+ obj = bpf_object__open_xattr(&open_attr);
if (IS_ERR_OR_NULL(obj))
return -ENOENT;
@@ -2252,14 +2285,14 @@ 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);
@@ -2271,7 +2304,8 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
}
bpf_map__for_each(map, obj) {
- map->map_ifindex = attr->ifindex;
+ if (!bpf_map__is_offload_neutral(map))
+ map->map_ifindex = attr->ifindex;
}
if (!first_prog) {
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 564f4be9bae0..1f8fc2060460 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -66,7 +66,13 @@ void libbpf_set_print(libbpf_print_fn_t warn,
/* Hide internal to user */
struct bpf_object;
+struct bpf_object_open_attr {
+ const char *file;
+ enum bpf_prog_type prog_type;
+};
+
struct bpf_object *bpf_object__open(const char *path);
+struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr);
struct bpf_object *bpf_object__open_buffer(void *obj_buf,
size_t obj_buf_sz,
const char *name);
@@ -92,6 +98,9 @@ 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,
@@ -252,6 +261,8 @@ typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
int bpf_map__set_priv(struct bpf_map *map, void *priv,
bpf_map_clear_priv_t clear_priv);
void *bpf_map__priv(struct bpf_map *map);
+int bpf_map__reuse_fd(struct bpf_map *map, int fd);
+bool bpf_map__is_offload_neutral(struct bpf_map *map);
void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
int bpf_map__pin(struct bpf_map *map, const char *path);
diff --git a/tools/lib/bpf/libbpf_errno.c b/tools/lib/bpf/libbpf_errno.c
new file mode 100644
index 000000000000..d9ba851bd7f9
--- /dev/null
+++ b/tools/lib/bpf/libbpf_errno.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: LGPL-2.1
+
+/*
+ * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
+ * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2015 Huawei Inc.
+ * Copyright (C) 2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses>
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "libbpf.h"
+
+#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
+#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
+#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
+
+static const char *libbpf_strerror_table[NR_ERRNO] = {
+ [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
+ [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
+ [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
+ [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
+ [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
+ [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
+ [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
+ [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
+ [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
+ [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
+ [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
+ [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
+};
+
+int libbpf_strerror(int err, char *buf, size_t size)
+{
+ if (!buf || !size)
+ return -1;
+
+ err = err > 0 ? err : -err;
+
+ if (err < __LIBBPF_ERRNO__START) {
+ int ret;
+
+ ret = strerror_r(err, buf, size);
+ buf[size - 1] = '\0';
+ return ret;
+ }
+
+ if (err < __LIBBPF_ERRNO__END) {
+ const char *msg;
+
+ msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
+ snprintf(buf, size, "%s", msg);
+ buf[size - 1] = '\0';
+ return 0;
+ }
+
+ snprintf(buf, size, "Unknown libbpf error %d", err);
+ buf[size - 1] = '\0';
+ return -1;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2026-05-08 08:51:11 +0000