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- // SPDX-License-Identifier: LGPL-2.1
- /*
- * Common eBPF ELF object loading operations.
- *
- * 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>
- */
- #ifndef _GNU_SOURCE
- #define _GNU_SOURCE
- #endif
- #include <stdlib.h>
- #include <stdio.h>
- #include <stdarg.h>
- #include <libgen.h>
- #include <inttypes.h>
- #include <string.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <errno.h>
- #include <perf-sys.h>
- #include <asm/unistd.h>
- #include <linux/err.h>
- #include <linux/kernel.h>
- #include <linux/bpf.h>
- #include <linux/btf.h>
- #include <linux/list.h>
- #include <linux/limits.h>
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <sys/vfs.h>
- #include <tools/libc_compat.h>
- #include <libelf.h>
- #include <gelf.h>
- #include "libbpf.h"
- #include "bpf.h"
- #include "btf.h"
- #include "str_error.h"
- #ifndef EM_BPF
- #define EM_BPF 247
- #endif
- #ifndef BPF_FS_MAGIC
- #define BPF_FS_MAGIC 0xcafe4a11
- #endif
- #define __printf(a, b) __attribute__((format(printf, a, b)))
- __printf(1, 2)
- static int __base_pr(const char *format, ...)
- {
- va_list args;
- int err;
- va_start(args, format);
- err = vfprintf(stderr, format, args);
- va_end(args);
- return err;
- }
- static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
- static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
- static __printf(1, 2) libbpf_print_fn_t __pr_debug;
- #define __pr(func, fmt, ...) \
- do { \
- if ((func)) \
- (func)("libbpf: " fmt, ##__VA_ARGS__); \
- } while (0)
- #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
- #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
- #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
- void libbpf_set_print(libbpf_print_fn_t warn,
- libbpf_print_fn_t info,
- libbpf_print_fn_t debug)
- {
- __pr_warning = warn;
- __pr_info = info;
- __pr_debug = debug;
- }
- #define STRERR_BUFSIZE 128
- #define CHECK_ERR(action, err, out) do { \
- err = action; \
- if (err) \
- goto out; \
- } while(0)
- /* Copied from tools/perf/util/util.h */
- #ifndef zfree
- # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
- #endif
- #ifndef zclose
- # define zclose(fd) ({ \
- int ___err = 0; \
- if ((fd) >= 0) \
- ___err = close((fd)); \
- fd = -1; \
- ___err; })
- #endif
- #ifdef HAVE_LIBELF_MMAP_SUPPORT
- # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP
- #else
- # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ
- #endif
- /*
- * bpf_prog should be a better name but it has been used in
- * linux/filter.h.
- */
- struct bpf_program {
- /* Index in elf obj file, for relocation use. */
- int idx;
- char *name;
- int prog_ifindex;
- char *section_name;
- struct bpf_insn *insns;
- size_t insns_cnt, main_prog_cnt;
- enum bpf_prog_type type;
- struct reloc_desc {
- enum {
- RELO_LD64,
- RELO_CALL,
- } type;
- int insn_idx;
- union {
- int map_idx;
- int text_off;
- };
- } *reloc_desc;
- int nr_reloc;
- struct {
- int nr;
- int *fds;
- } instances;
- bpf_program_prep_t preprocessor;
- struct bpf_object *obj;
- void *priv;
- bpf_program_clear_priv_t clear_priv;
- enum bpf_attach_type expected_attach_type;
- };
- struct bpf_map {
- int fd;
- char *name;
- size_t offset;
- int map_ifindex;
- struct bpf_map_def def;
- __u32 btf_key_type_id;
- __u32 btf_value_type_id;
- void *priv;
- bpf_map_clear_priv_t clear_priv;
- };
- static LIST_HEAD(bpf_objects_list);
- struct bpf_object {
- char license[64];
- u32 kern_version;
- struct bpf_program *programs;
- size_t nr_programs;
- struct bpf_map *maps;
- size_t nr_maps;
- bool loaded;
- bool has_pseudo_calls;
- /*
- * Information when doing elf related work. Only valid if fd
- * is valid.
- */
- struct {
- int fd;
- void *obj_buf;
- size_t obj_buf_sz;
- Elf *elf;
- GElf_Ehdr ehdr;
- Elf_Data *symbols;
- size_t strtabidx;
- struct {
- GElf_Shdr shdr;
- Elf_Data *data;
- } *reloc;
- int nr_reloc;
- int maps_shndx;
- int text_shndx;
- } efile;
- /*
- * All loaded bpf_object is linked in a list, which is
- * hidden to caller. bpf_objects__<func> handlers deal with
- * all objects.
- */
- struct list_head list;
- struct btf *btf;
- void *priv;
- bpf_object_clear_priv_t clear_priv;
- char path[];
- };
- #define obj_elf_valid(o) ((o)->efile.elf)
- static void bpf_program__unload(struct bpf_program *prog)
- {
- int i;
- if (!prog)
- return;
- /*
- * If the object is opened but the program was never loaded,
- * it is possible that prog->instances.nr == -1.
- */
- if (prog->instances.nr > 0) {
- for (i = 0; i < prog->instances.nr; i++)
- zclose(prog->instances.fds[i]);
- } else if (prog->instances.nr != -1) {
- pr_warning("Internal error: instances.nr is %d\n",
- prog->instances.nr);
- }
- prog->instances.nr = -1;
- zfree(&prog->instances.fds);
- }
- static void bpf_program__exit(struct bpf_program *prog)
- {
- if (!prog)
- return;
- if (prog->clear_priv)
- prog->clear_priv(prog, prog->priv);
- prog->priv = NULL;
- prog->clear_priv = NULL;
- bpf_program__unload(prog);
- zfree(&prog->name);
- zfree(&prog->section_name);
- zfree(&prog->insns);
- zfree(&prog->reloc_desc);
- prog->nr_reloc = 0;
- prog->insns_cnt = 0;
- prog->idx = -1;
- }
- static int
- bpf_program__init(void *data, size_t size, char *section_name, int idx,
- struct bpf_program *prog)
- {
- if (size < sizeof(struct bpf_insn)) {
- pr_warning("corrupted section '%s'\n", section_name);
- return -EINVAL;
- }
- bzero(prog, sizeof(*prog));
- prog->section_name = strdup(section_name);
- if (!prog->section_name) {
- pr_warning("failed to alloc name for prog under section(%d) %s\n",
- idx, section_name);
- goto errout;
- }
- prog->insns = malloc(size);
- if (!prog->insns) {
- pr_warning("failed to alloc insns for prog under section %s\n",
- section_name);
- goto errout;
- }
- prog->insns_cnt = size / sizeof(struct bpf_insn);
- memcpy(prog->insns, data,
- prog->insns_cnt * sizeof(struct bpf_insn));
- prog->idx = idx;
- prog->instances.fds = NULL;
- prog->instances.nr = -1;
- prog->type = BPF_PROG_TYPE_KPROBE;
- return 0;
- errout:
- bpf_program__exit(prog);
- return -ENOMEM;
- }
- static int
- bpf_object__add_program(struct bpf_object *obj, void *data, size_t size,
- char *section_name, int idx)
- {
- struct bpf_program prog, *progs;
- int nr_progs, err;
- err = bpf_program__init(data, size, section_name, idx, &prog);
- if (err)
- return err;
- progs = obj->programs;
- nr_progs = obj->nr_programs;
- progs = reallocarray(progs, nr_progs + 1, sizeof(progs[0]));
- if (!progs) {
- /*
- * In this case the original obj->programs
- * is still valid, so don't need special treat for
- * bpf_close_object().
- */
- pr_warning("failed to alloc a new program under section '%s'\n",
- section_name);
- bpf_program__exit(&prog);
- return -ENOMEM;
- }
- pr_debug("found program %s\n", prog.section_name);
- obj->programs = progs;
- obj->nr_programs = nr_progs + 1;
- prog.obj = obj;
- progs[nr_progs] = prog;
- return 0;
- }
- static int
- bpf_object__init_prog_names(struct bpf_object *obj)
- {
- Elf_Data *symbols = obj->efile.symbols;
- struct bpf_program *prog;
- size_t pi, si;
- for (pi = 0; pi < obj->nr_programs; pi++) {
- const char *name = NULL;
- prog = &obj->programs[pi];
- for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name;
- si++) {
- GElf_Sym sym;
- if (!gelf_getsym(symbols, si, &sym))
- continue;
- if (sym.st_shndx != prog->idx)
- continue;
- if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL)
- continue;
- name = elf_strptr(obj->efile.elf,
- obj->efile.strtabidx,
- sym.st_name);
- if (!name) {
- pr_warning("failed to get sym name string for prog %s\n",
- prog->section_name);
- return -LIBBPF_ERRNO__LIBELF;
- }
- }
- if (!name && prog->idx == obj->efile.text_shndx)
- name = ".text";
- if (!name) {
- pr_warning("failed to find sym for prog %s\n",
- prog->section_name);
- return -EINVAL;
- }
- prog->name = strdup(name);
- if (!prog->name) {
- pr_warning("failed to allocate memory for prog sym %s\n",
- name);
- return -ENOMEM;
- }
- }
- return 0;
- }
- static struct bpf_object *bpf_object__new(const char *path,
- void *obj_buf,
- size_t obj_buf_sz)
- {
- struct bpf_object *obj;
- obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1);
- if (!obj) {
- pr_warning("alloc memory failed for %s\n", path);
- return ERR_PTR(-ENOMEM);
- }
- strcpy(obj->path, path);
- obj->efile.fd = -1;
- /*
- * Caller of this function should also calls
- * bpf_object__elf_finish() after data collection to return
- * obj_buf to user. If not, we should duplicate the buffer to
- * avoid user freeing them before elf finish.
- */
- obj->efile.obj_buf = obj_buf;
- obj->efile.obj_buf_sz = obj_buf_sz;
- obj->efile.maps_shndx = -1;
- obj->loaded = false;
- INIT_LIST_HEAD(&obj->list);
- list_add(&obj->list, &bpf_objects_list);
- return obj;
- }
- static void bpf_object__elf_finish(struct bpf_object *obj)
- {
- if (!obj_elf_valid(obj))
- return;
- if (obj->efile.elf) {
- elf_end(obj->efile.elf);
- obj->efile.elf = NULL;
- }
- obj->efile.symbols = NULL;
- zfree(&obj->efile.reloc);
- obj->efile.nr_reloc = 0;
- zclose(obj->efile.fd);
- obj->efile.obj_buf = NULL;
- obj->efile.obj_buf_sz = 0;
- }
- static int bpf_object__elf_init(struct bpf_object *obj)
- {
- int err = 0;
- GElf_Ehdr *ep;
- if (obj_elf_valid(obj)) {
- pr_warning("elf init: internal error\n");
- return -LIBBPF_ERRNO__LIBELF;
- }
- if (obj->efile.obj_buf_sz > 0) {
- /*
- * obj_buf should have been validated by
- * bpf_object__open_buffer().
- */
- obj->efile.elf = elf_memory(obj->efile.obj_buf,
- obj->efile.obj_buf_sz);
- } else {
- obj->efile.fd = open(obj->path, O_RDONLY);
- if (obj->efile.fd < 0) {
- char errmsg[STRERR_BUFSIZE];
- char *cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("failed to open %s: %s\n", obj->path, cp);
- return -errno;
- }
- obj->efile.elf = elf_begin(obj->efile.fd,
- LIBBPF_ELF_C_READ_MMAP,
- NULL);
- }
- if (!obj->efile.elf) {
- pr_warning("failed to open %s as ELF file\n",
- obj->path);
- err = -LIBBPF_ERRNO__LIBELF;
- goto errout;
- }
- if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) {
- pr_warning("failed to get EHDR from %s\n",
- obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- goto errout;
- }
- ep = &obj->efile.ehdr;
- /* Old LLVM set e_machine to EM_NONE */
- if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) {
- pr_warning("%s is not an eBPF object file\n",
- obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- goto errout;
- }
- return 0;
- errout:
- bpf_object__elf_finish(obj);
- return err;
- }
- static int
- bpf_object__check_endianness(struct bpf_object *obj)
- {
- static unsigned int const endian = 1;
- switch (obj->efile.ehdr.e_ident[EI_DATA]) {
- case ELFDATA2LSB:
- /* We are big endian, BPF obj is little endian. */
- if (*(unsigned char const *)&endian != 1)
- goto mismatch;
- break;
- case ELFDATA2MSB:
- /* We are little endian, BPF obj is big endian. */
- if (*(unsigned char const *)&endian != 0)
- goto mismatch;
- break;
- default:
- return -LIBBPF_ERRNO__ENDIAN;
- }
- return 0;
- mismatch:
- pr_warning("Error: endianness mismatch.\n");
- return -LIBBPF_ERRNO__ENDIAN;
- }
- static int
- bpf_object__init_license(struct bpf_object *obj,
- void *data, size_t size)
- {
- memcpy(obj->license, data,
- min(size, sizeof(obj->license) - 1));
- pr_debug("license of %s is %s\n", obj->path, obj->license);
- return 0;
- }
- static int
- bpf_object__init_kversion(struct bpf_object *obj,
- void *data, size_t size)
- {
- u32 kver;
- if (size != sizeof(kver)) {
- pr_warning("invalid kver section in %s\n", obj->path);
- return -LIBBPF_ERRNO__FORMAT;
- }
- memcpy(&kver, data, sizeof(kver));
- obj->kern_version = kver;
- pr_debug("kernel version of %s is %x\n", obj->path,
- obj->kern_version);
- return 0;
- }
- static int compare_bpf_map(const void *_a, const void *_b)
- {
- const struct bpf_map *a = _a;
- const struct bpf_map *b = _b;
- return a->offset - b->offset;
- }
- static int
- bpf_object__init_maps(struct bpf_object *obj)
- {
- int i, map_idx, map_def_sz, nr_maps = 0;
- Elf_Scn *scn;
- Elf_Data *data;
- Elf_Data *symbols = obj->efile.symbols;
- if (obj->efile.maps_shndx < 0)
- return -EINVAL;
- if (!symbols)
- return -EINVAL;
- scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx);
- if (scn)
- data = elf_getdata(scn, NULL);
- if (!scn || !data) {
- pr_warning("failed to get Elf_Data from map section %d\n",
- obj->efile.maps_shndx);
- return -EINVAL;
- }
- /*
- * Count number of maps. Each map has a name.
- * Array of maps is not supported: only the first element is
- * considered.
- *
- * TODO: Detect array of map and report error.
- */
- for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
- GElf_Sym sym;
- if (!gelf_getsym(symbols, i, &sym))
- continue;
- if (sym.st_shndx != obj->efile.maps_shndx)
- continue;
- nr_maps++;
- }
- /* Alloc obj->maps and fill nr_maps. */
- pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
- nr_maps, data->d_size);
- if (!nr_maps)
- return 0;
- /* Assume equally sized map definitions */
- map_def_sz = data->d_size / nr_maps;
- if (!data->d_size || (data->d_size % nr_maps) != 0) {
- pr_warning("unable to determine map definition size "
- "section %s, %d maps in %zd bytes\n",
- obj->path, nr_maps, data->d_size);
- return -EINVAL;
- }
- obj->maps = calloc(nr_maps, sizeof(obj->maps[0]));
- if (!obj->maps) {
- pr_warning("alloc maps for object failed\n");
- return -ENOMEM;
- }
- obj->nr_maps = nr_maps;
- /*
- * fill all fd with -1 so won't close incorrect
- * fd (fd=0 is stdin) when failure (zclose won't close
- * negative fd)).
- */
- for (i = 0; i < nr_maps; i++)
- obj->maps[i].fd = -1;
- /*
- * Fill obj->maps using data in "maps" section.
- */
- for (i = 0, map_idx = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
- GElf_Sym sym;
- const char *map_name;
- struct bpf_map_def *def;
- if (!gelf_getsym(symbols, i, &sym))
- continue;
- if (sym.st_shndx != obj->efile.maps_shndx)
- continue;
- map_name = elf_strptr(obj->efile.elf,
- obj->efile.strtabidx,
- sym.st_name);
- obj->maps[map_idx].offset = sym.st_value;
- if (sym.st_value + map_def_sz > data->d_size) {
- pr_warning("corrupted maps section in %s: last map \"%s\" too small\n",
- obj->path, map_name);
- return -EINVAL;
- }
- obj->maps[map_idx].name = strdup(map_name);
- if (!obj->maps[map_idx].name) {
- pr_warning("failed to alloc map name\n");
- return -ENOMEM;
- }
- pr_debug("map %d is \"%s\"\n", map_idx,
- obj->maps[map_idx].name);
- def = (struct bpf_map_def *)(data->d_buf + sym.st_value);
- /*
- * If the definition of the map in the object file fits in
- * bpf_map_def, copy it. Any extra fields in our version
- * of bpf_map_def will default to zero as a result of the
- * calloc above.
- */
- if (map_def_sz <= sizeof(struct bpf_map_def)) {
- memcpy(&obj->maps[map_idx].def, def, map_def_sz);
- } else {
- /*
- * Here the map structure being read is bigger than what
- * we expect, truncate if the excess bits are all zero.
- * If they are not zero, reject this map as
- * incompatible.
- */
- char *b;
- for (b = ((char *)def) + sizeof(struct bpf_map_def);
- b < ((char *)def) + map_def_sz; b++) {
- if (*b != 0) {
- pr_warning("maps section in %s: \"%s\" "
- "has unrecognized, non-zero "
- "options\n",
- obj->path, map_name);
- return -EINVAL;
- }
- }
- memcpy(&obj->maps[map_idx].def, def,
- sizeof(struct bpf_map_def));
- }
- map_idx++;
- }
- qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]), compare_bpf_map);
- return 0;
- }
- static bool section_have_execinstr(struct bpf_object *obj, int idx)
- {
- Elf_Scn *scn;
- GElf_Shdr sh;
- scn = elf_getscn(obj->efile.elf, idx);
- if (!scn)
- return false;
- if (gelf_getshdr(scn, &sh) != &sh)
- return false;
- if (sh.sh_flags & SHF_EXECINSTR)
- return true;
- return false;
- }
- static int bpf_object__elf_collect(struct bpf_object *obj)
- {
- Elf *elf = obj->efile.elf;
- GElf_Ehdr *ep = &obj->efile.ehdr;
- Elf_Scn *scn = NULL;
- int idx = 0, err = 0;
- /* Elf is corrupted/truncated, avoid calling elf_strptr. */
- if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) {
- pr_warning("failed to get e_shstrndx from %s\n",
- obj->path);
- return -LIBBPF_ERRNO__FORMAT;
- }
- while ((scn = elf_nextscn(elf, scn)) != NULL) {
- char *name;
- GElf_Shdr sh;
- Elf_Data *data;
- idx++;
- if (gelf_getshdr(scn, &sh) != &sh) {
- pr_warning("failed to get section(%d) header from %s\n",
- idx, obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- goto out;
- }
- name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name);
- if (!name) {
- pr_warning("failed to get section(%d) name from %s\n",
- idx, obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- goto out;
- }
- data = elf_getdata(scn, 0);
- if (!data) {
- pr_warning("failed to get section(%d) data from %s(%s)\n",
- idx, name, obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- goto out;
- }
- pr_debug("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
- idx, name, (unsigned long)data->d_size,
- (int)sh.sh_link, (unsigned long)sh.sh_flags,
- (int)sh.sh_type);
- if (strcmp(name, "license") == 0)
- err = bpf_object__init_license(obj,
- data->d_buf,
- data->d_size);
- else if (strcmp(name, "version") == 0)
- err = bpf_object__init_kversion(obj,
- data->d_buf,
- data->d_size);
- else if (strcmp(name, "maps") == 0)
- obj->efile.maps_shndx = idx;
- else if (strcmp(name, BTF_ELF_SEC) == 0) {
- obj->btf = btf__new(data->d_buf, data->d_size,
- __pr_debug);
- if (IS_ERR(obj->btf)) {
- pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
- BTF_ELF_SEC, PTR_ERR(obj->btf));
- obj->btf = NULL;
- }
- } else if (sh.sh_type == SHT_SYMTAB) {
- if (obj->efile.symbols) {
- pr_warning("bpf: multiple SYMTAB in %s\n",
- obj->path);
- err = -LIBBPF_ERRNO__FORMAT;
- } else {
- obj->efile.symbols = data;
- obj->efile.strtabidx = sh.sh_link;
- }
- } else if ((sh.sh_type == SHT_PROGBITS) &&
- (sh.sh_flags & SHF_EXECINSTR) &&
- (data->d_size > 0)) {
- if (strcmp(name, ".text") == 0)
- obj->efile.text_shndx = idx;
- err = bpf_object__add_program(obj, data->d_buf,
- data->d_size, name, idx);
- if (err) {
- char errmsg[STRERR_BUFSIZE];
- char *cp = str_error(-err, errmsg, sizeof(errmsg));
- pr_warning("failed to alloc program %s (%s): %s",
- name, obj->path, cp);
- }
- } else if (sh.sh_type == SHT_REL) {
- void *reloc = obj->efile.reloc;
- int nr_reloc = obj->efile.nr_reloc + 1;
- int sec = sh.sh_info; /* points to other section */
- /* Only do relo for section with exec instructions */
- if (!section_have_execinstr(obj, sec)) {
- pr_debug("skip relo %s(%d) for section(%d)\n",
- name, idx, sec);
- continue;
- }
- reloc = reallocarray(reloc, nr_reloc,
- sizeof(*obj->efile.reloc));
- if (!reloc) {
- pr_warning("realloc failed\n");
- err = -ENOMEM;
- } else {
- int n = nr_reloc - 1;
- obj->efile.reloc = reloc;
- obj->efile.nr_reloc = nr_reloc;
- obj->efile.reloc[n].shdr = sh;
- obj->efile.reloc[n].data = data;
- }
- } else {
- pr_debug("skip section(%d) %s\n", idx, name);
- }
- if (err)
- goto out;
- }
- if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) {
- pr_warning("Corrupted ELF file: index of strtab invalid\n");
- return LIBBPF_ERRNO__FORMAT;
- }
- if (obj->efile.maps_shndx >= 0) {
- err = bpf_object__init_maps(obj);
- if (err)
- goto out;
- }
- err = bpf_object__init_prog_names(obj);
- out:
- return err;
- }
- static struct bpf_program *
- bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx)
- {
- struct bpf_program *prog;
- size_t i;
- for (i = 0; i < obj->nr_programs; i++) {
- prog = &obj->programs[i];
- if (prog->idx == idx)
- return prog;
- }
- return NULL;
- }
- struct bpf_program *
- bpf_object__find_program_by_title(struct bpf_object *obj, const char *title)
- {
- struct bpf_program *pos;
- bpf_object__for_each_program(pos, obj) {
- if (pos->section_name && !strcmp(pos->section_name, title))
- return pos;
- }
- return NULL;
- }
- static int
- bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
- Elf_Data *data, struct bpf_object *obj)
- {
- Elf_Data *symbols = obj->efile.symbols;
- int text_shndx = obj->efile.text_shndx;
- int maps_shndx = obj->efile.maps_shndx;
- struct bpf_map *maps = obj->maps;
- size_t nr_maps = obj->nr_maps;
- int i, nrels;
- pr_debug("collecting relocating info for: '%s'\n",
- prog->section_name);
- nrels = shdr->sh_size / shdr->sh_entsize;
- prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels);
- if (!prog->reloc_desc) {
- pr_warning("failed to alloc memory in relocation\n");
- return -ENOMEM;
- }
- prog->nr_reloc = nrels;
- for (i = 0; i < nrels; i++) {
- GElf_Sym sym;
- GElf_Rel rel;
- unsigned int insn_idx;
- struct bpf_insn *insns = prog->insns;
- size_t map_idx;
- if (!gelf_getrel(data, i, &rel)) {
- pr_warning("relocation: failed to get %d reloc\n", i);
- return -LIBBPF_ERRNO__FORMAT;
- }
- if (!gelf_getsym(symbols,
- GELF_R_SYM(rel.r_info),
- &sym)) {
- pr_warning("relocation: symbol %"PRIx64" not found\n",
- GELF_R_SYM(rel.r_info));
- return -LIBBPF_ERRNO__FORMAT;
- }
- pr_debug("relo for %lld value %lld name %d\n",
- (long long) (rel.r_info >> 32),
- (long long) sym.st_value, sym.st_name);
- if (sym.st_shndx != maps_shndx && sym.st_shndx != text_shndx) {
- pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n",
- prog->section_name, sym.st_shndx);
- return -LIBBPF_ERRNO__RELOC;
- }
- insn_idx = rel.r_offset / sizeof(struct bpf_insn);
- pr_debug("relocation: insn_idx=%u\n", insn_idx);
- if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) {
- if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) {
- pr_warning("incorrect bpf_call opcode\n");
- return -LIBBPF_ERRNO__RELOC;
- }
- prog->reloc_desc[i].type = RELO_CALL;
- prog->reloc_desc[i].insn_idx = insn_idx;
- prog->reloc_desc[i].text_off = sym.st_value;
- obj->has_pseudo_calls = true;
- continue;
- }
- if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
- pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n",
- insn_idx, insns[insn_idx].code);
- return -LIBBPF_ERRNO__RELOC;
- }
- /* TODO: 'maps' is sorted. We can use bsearch to make it faster. */
- for (map_idx = 0; map_idx < nr_maps; map_idx++) {
- if (maps[map_idx].offset == sym.st_value) {
- pr_debug("relocation: find map %zd (%s) for insn %u\n",
- map_idx, maps[map_idx].name, insn_idx);
- break;
- }
- }
- if (map_idx >= nr_maps) {
- pr_warning("bpf relocation: map_idx %d large than %d\n",
- (int)map_idx, (int)nr_maps - 1);
- return -LIBBPF_ERRNO__RELOC;
- }
- prog->reloc_desc[i].type = RELO_LD64;
- prog->reloc_desc[i].insn_idx = insn_idx;
- prog->reloc_desc[i].map_idx = map_idx;
- }
- return 0;
- }
- static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
- {
- const struct btf_type *container_type;
- const struct btf_member *key, *value;
- struct bpf_map_def *def = &map->def;
- const size_t max_name = 256;
- char container_name[max_name];
- __s64 key_size, value_size;
- __s32 container_id;
- if (snprintf(container_name, max_name, "____btf_map_%s", map->name) ==
- max_name) {
- pr_warning("map:%s length of '____btf_map_%s' is too long\n",
- map->name, map->name);
- return -EINVAL;
- }
- container_id = btf__find_by_name(btf, container_name);
- if (container_id < 0) {
- pr_debug("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
- map->name, container_name);
- return container_id;
- }
- container_type = btf__type_by_id(btf, container_id);
- if (!container_type) {
- pr_warning("map:%s cannot find BTF type for container_id:%u\n",
- map->name, container_id);
- return -EINVAL;
- }
- if (BTF_INFO_KIND(container_type->info) != BTF_KIND_STRUCT ||
- BTF_INFO_VLEN(container_type->info) < 2) {
- pr_warning("map:%s container_name:%s is an invalid container struct\n",
- map->name, container_name);
- return -EINVAL;
- }
- key = (struct btf_member *)(container_type + 1);
- value = key + 1;
- key_size = btf__resolve_size(btf, key->type);
- if (key_size < 0) {
- pr_warning("map:%s invalid BTF key_type_size\n",
- map->name);
- return key_size;
- }
- if (def->key_size != key_size) {
- pr_warning("map:%s btf_key_type_size:%u != map_def_key_size:%u\n",
- map->name, (__u32)key_size, def->key_size);
- return -EINVAL;
- }
- value_size = btf__resolve_size(btf, value->type);
- if (value_size < 0) {
- pr_warning("map:%s invalid BTF value_type_size\n", map->name);
- return value_size;
- }
- if (def->value_size != value_size) {
- pr_warning("map:%s btf_value_type_size:%u != map_def_value_size:%u\n",
- map->name, (__u32)value_size, def->value_size);
- return -EINVAL;
- }
- map->btf_key_type_id = key->type;
- map->btf_value_type_id = value->type;
- 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) {
- err = -errno;
- goto err_free_new_name;
- }
- new_fd = dup3(fd, new_fd, O_CLOEXEC);
- if (new_fd < 0) {
- err = -errno;
- goto err_close_new_fd;
- }
- err = zclose(map->fd);
- if (err) {
- err = -errno;
- 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 err;
- }
- static int
- bpf_object__create_maps(struct bpf_object *obj)
- {
- struct bpf_create_map_attr create_attr = {};
- unsigned int i;
- int err;
- for (i = 0; i < obj->nr_maps; i++) {
- struct bpf_map *map = &obj->maps[i];
- struct bpf_map_def *def = &map->def;
- char *cp, errmsg[STRERR_BUFSIZE];
- 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;
- create_attr.map_flags = def->map_flags;
- create_attr.key_size = def->key_size;
- create_attr.value_size = def->value_size;
- create_attr.max_entries = def->max_entries;
- create_attr.btf_fd = 0;
- create_attr.btf_key_type_id = 0;
- create_attr.btf_value_type_id = 0;
- if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) {
- create_attr.btf_fd = btf__fd(obj->btf);
- create_attr.btf_key_type_id = map->btf_key_type_id;
- create_attr.btf_value_type_id = map->btf_value_type_id;
- }
- *pfd = bpf_create_map_xattr(&create_attr);
- if (*pfd < 0 && create_attr.btf_key_type_id) {
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n",
- map->name, cp, errno);
- create_attr.btf_fd = 0;
- create_attr.btf_key_type_id = 0;
- create_attr.btf_value_type_id = 0;
- map->btf_key_type_id = 0;
- map->btf_value_type_id = 0;
- *pfd = bpf_create_map_xattr(&create_attr);
- }
- if (*pfd < 0) {
- size_t j;
- err = *pfd;
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("failed to create map (name: '%s'): %s\n",
- map->name, cp);
- for (j = 0; j < i; j++)
- zclose(obj->maps[j].fd);
- return err;
- }
- pr_debug("create map %s: fd=%d\n", map->name, *pfd);
- }
- return 0;
- }
- static int
- bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj,
- struct reloc_desc *relo)
- {
- struct bpf_insn *insn, *new_insn;
- struct bpf_program *text;
- size_t new_cnt;
- if (relo->type != RELO_CALL)
- return -LIBBPF_ERRNO__RELOC;
- if (prog->idx == obj->efile.text_shndx) {
- pr_warning("relo in .text insn %d into off %d\n",
- relo->insn_idx, relo->text_off);
- return -LIBBPF_ERRNO__RELOC;
- }
- if (prog->main_prog_cnt == 0) {
- text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx);
- if (!text) {
- pr_warning("no .text section found yet relo into text exist\n");
- return -LIBBPF_ERRNO__RELOC;
- }
- new_cnt = prog->insns_cnt + text->insns_cnt;
- new_insn = reallocarray(prog->insns, new_cnt, sizeof(*insn));
- if (!new_insn) {
- pr_warning("oom in prog realloc\n");
- return -ENOMEM;
- }
- memcpy(new_insn + prog->insns_cnt, text->insns,
- text->insns_cnt * sizeof(*insn));
- prog->insns = new_insn;
- prog->main_prog_cnt = prog->insns_cnt;
- prog->insns_cnt = new_cnt;
- pr_debug("added %zd insn from %s to prog %s\n",
- text->insns_cnt, text->section_name,
- prog->section_name);
- }
- insn = &prog->insns[relo->insn_idx];
- insn->imm += prog->main_prog_cnt - relo->insn_idx;
- return 0;
- }
- static int
- bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj)
- {
- int i, err;
- if (!prog || !prog->reloc_desc)
- return 0;
- for (i = 0; i < prog->nr_reloc; i++) {
- if (prog->reloc_desc[i].type == RELO_LD64) {
- struct bpf_insn *insns = prog->insns;
- int insn_idx, map_idx;
- insn_idx = prog->reloc_desc[i].insn_idx;
- map_idx = prog->reloc_desc[i].map_idx;
- if (insn_idx >= (int)prog->insns_cnt) {
- pr_warning("relocation out of range: '%s'\n",
- prog->section_name);
- return -LIBBPF_ERRNO__RELOC;
- }
- insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
- insns[insn_idx].imm = obj->maps[map_idx].fd;
- } else {
- err = bpf_program__reloc_text(prog, obj,
- &prog->reloc_desc[i]);
- if (err)
- return err;
- }
- }
- zfree(&prog->reloc_desc);
- prog->nr_reloc = 0;
- return 0;
- }
- static int
- bpf_object__relocate(struct bpf_object *obj)
- {
- struct bpf_program *prog;
- size_t i;
- int err;
- for (i = 0; i < obj->nr_programs; i++) {
- prog = &obj->programs[i];
- err = bpf_program__relocate(prog, obj);
- if (err) {
- pr_warning("failed to relocate '%s'\n",
- prog->section_name);
- return err;
- }
- }
- return 0;
- }
- static int bpf_object__collect_reloc(struct bpf_object *obj)
- {
- int i, err;
- if (!obj_elf_valid(obj)) {
- pr_warning("Internal error: elf object is closed\n");
- return -LIBBPF_ERRNO__INTERNAL;
- }
- for (i = 0; i < obj->efile.nr_reloc; i++) {
- GElf_Shdr *shdr = &obj->efile.reloc[i].shdr;
- Elf_Data *data = obj->efile.reloc[i].data;
- int idx = shdr->sh_info;
- struct bpf_program *prog;
- if (shdr->sh_type != SHT_REL) {
- pr_warning("internal error at %d\n", __LINE__);
- return -LIBBPF_ERRNO__INTERNAL;
- }
- prog = bpf_object__find_prog_by_idx(obj, idx);
- if (!prog) {
- pr_warning("relocation failed: no section(%d)\n", idx);
- return -LIBBPF_ERRNO__RELOC;
- }
- err = bpf_program__collect_reloc(prog,
- shdr, data,
- obj);
- if (err)
- return err;
- }
- return 0;
- }
- static int
- load_program(enum bpf_prog_type type, enum bpf_attach_type expected_attach_type,
- const char *name, struct bpf_insn *insns, int insns_cnt,
- char *license, u32 kern_version, int *pfd, int prog_ifindex)
- {
- struct bpf_load_program_attr load_attr;
- char *cp, errmsg[STRERR_BUFSIZE];
- char *log_buf;
- int ret;
- memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
- load_attr.prog_type = type;
- load_attr.expected_attach_type = expected_attach_type;
- load_attr.name = name;
- load_attr.insns = insns;
- load_attr.insns_cnt = insns_cnt;
- load_attr.license = license;
- load_attr.kern_version = kern_version;
- load_attr.prog_ifindex = prog_ifindex;
- if (!load_attr.insns || !load_attr.insns_cnt)
- return -EINVAL;
- log_buf = malloc(BPF_LOG_BUF_SIZE);
- if (!log_buf)
- pr_warning("Alloc log buffer for bpf loader error, continue without log\n");
- ret = bpf_load_program_xattr(&load_attr, log_buf, BPF_LOG_BUF_SIZE);
- if (ret >= 0) {
- *pfd = ret;
- ret = 0;
- goto out;
- }
- ret = -LIBBPF_ERRNO__LOAD;
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("load bpf program failed: %s\n", cp);
- if (log_buf && log_buf[0] != '\0') {
- ret = -LIBBPF_ERRNO__VERIFY;
- pr_warning("-- BEGIN DUMP LOG ---\n");
- pr_warning("\n%s\n", log_buf);
- pr_warning("-- END LOG --\n");
- } else if (load_attr.insns_cnt >= BPF_MAXINSNS) {
- pr_warning("Program too large (%zu insns), at most %d insns\n",
- load_attr.insns_cnt, BPF_MAXINSNS);
- ret = -LIBBPF_ERRNO__PROG2BIG;
- } else {
- /* Wrong program type? */
- if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) {
- int fd;
- load_attr.prog_type = BPF_PROG_TYPE_KPROBE;
- load_attr.expected_attach_type = 0;
- fd = bpf_load_program_xattr(&load_attr, NULL, 0);
- if (fd >= 0) {
- close(fd);
- ret = -LIBBPF_ERRNO__PROGTYPE;
- goto out;
- }
- }
- if (log_buf)
- ret = -LIBBPF_ERRNO__KVER;
- }
- out:
- free(log_buf);
- return ret;
- }
- static int
- bpf_program__load(struct bpf_program *prog,
- char *license, u32 kern_version)
- {
- int err = 0, fd, i;
- if (prog->instances.nr < 0 || !prog->instances.fds) {
- if (prog->preprocessor) {
- pr_warning("Internal error: can't load program '%s'\n",
- prog->section_name);
- return -LIBBPF_ERRNO__INTERNAL;
- }
- prog->instances.fds = malloc(sizeof(int));
- if (!prog->instances.fds) {
- pr_warning("Not enough memory for BPF fds\n");
- return -ENOMEM;
- }
- prog->instances.nr = 1;
- prog->instances.fds[0] = -1;
- }
- if (!prog->preprocessor) {
- if (prog->instances.nr != 1) {
- pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n",
- prog->section_name, prog->instances.nr);
- }
- err = load_program(prog->type, prog->expected_attach_type,
- prog->name, prog->insns, prog->insns_cnt,
- license, kern_version, &fd,
- prog->prog_ifindex);
- if (!err)
- prog->instances.fds[0] = fd;
- goto out;
- }
- for (i = 0; i < prog->instances.nr; i++) {
- struct bpf_prog_prep_result result;
- bpf_program_prep_t preprocessor = prog->preprocessor;
- bzero(&result, sizeof(result));
- err = preprocessor(prog, i, prog->insns,
- prog->insns_cnt, &result);
- if (err) {
- pr_warning("Preprocessing the %dth instance of program '%s' failed\n",
- i, prog->section_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);
- prog->instances.fds[i] = -1;
- if (result.pfd)
- *result.pfd = -1;
- continue;
- }
- err = load_program(prog->type, prog->expected_attach_type,
- prog->name, result.new_insn_ptr,
- result.new_insn_cnt,
- license, kern_version, &fd,
- prog->prog_ifindex);
- if (err) {
- pr_warning("Loading the %dth instance of program '%s' failed\n",
- i, prog->section_name);
- goto out;
- }
- if (result.pfd)
- *result.pfd = fd;
- prog->instances.fds[i] = fd;
- }
- out:
- if (err)
- pr_warning("failed to load program '%s'\n",
- prog->section_name);
- zfree(&prog->insns);
- prog->insns_cnt = 0;
- return err;
- }
- static bool bpf_program__is_function_storage(struct bpf_program *prog,
- struct bpf_object *obj)
- {
- return prog->idx == obj->efile.text_shndx && obj->has_pseudo_calls;
- }
- static int
- bpf_object__load_progs(struct bpf_object *obj)
- {
- size_t i;
- int err;
- for (i = 0; i < obj->nr_programs; i++) {
- if (bpf_program__is_function_storage(&obj->programs[i], obj))
- continue;
- err = bpf_program__load(&obj->programs[i],
- obj->license,
- obj->kern_version);
- if (err)
- return err;
- }
- return 0;
- }
- static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
- {
- switch (type) {
- case BPF_PROG_TYPE_SOCKET_FILTER:
- case BPF_PROG_TYPE_SCHED_CLS:
- case BPF_PROG_TYPE_SCHED_ACT:
- case BPF_PROG_TYPE_XDP:
- case BPF_PROG_TYPE_CGROUP_SKB:
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_LWT_IN:
- case BPF_PROG_TYPE_LWT_OUT:
- case BPF_PROG_TYPE_LWT_XMIT:
- case BPF_PROG_TYPE_LWT_SEG6LOCAL:
- case BPF_PROG_TYPE_SOCK_OPS:
- case BPF_PROG_TYPE_SK_SKB:
- case BPF_PROG_TYPE_CGROUP_DEVICE:
- case BPF_PROG_TYPE_SK_MSG:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_LIRC_MODE2:
- case BPF_PROG_TYPE_SK_REUSEPORT:
- return false;
- case BPF_PROG_TYPE_UNSPEC:
- case BPF_PROG_TYPE_KPROBE:
- case BPF_PROG_TYPE_TRACEPOINT:
- case BPF_PROG_TYPE_PERF_EVENT:
- case BPF_PROG_TYPE_RAW_TRACEPOINT:
- default:
- return true;
- }
- }
- static int bpf_object__validate(struct bpf_object *obj, bool needs_kver)
- {
- if (needs_kver && obj->kern_version == 0) {
- pr_warning("%s doesn't provide kernel version\n",
- obj->path);
- return -LIBBPF_ERRNO__KVERSION;
- }
- return 0;
- }
- static struct bpf_object *
- __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz,
- bool needs_kver)
- {
- struct bpf_object *obj;
- int err;
- if (elf_version(EV_CURRENT) == EV_NONE) {
- pr_warning("failed to init libelf for %s\n", path);
- return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
- }
- obj = bpf_object__new(path, obj_buf, obj_buf_sz);
- if (IS_ERR(obj))
- return obj;
- CHECK_ERR(bpf_object__elf_init(obj), err, out);
- CHECK_ERR(bpf_object__check_endianness(obj), err, out);
- CHECK_ERR(bpf_object__elf_collect(obj), err, out);
- CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
- CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out);
- bpf_object__elf_finish(obj);
- return obj;
- out:
- bpf_object__close(obj);
- return ERR_PTR(err);
- }
- struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr)
- {
- /* param validation */
- if (!attr->file)
- return NULL;
- 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_xattr(&attr);
- }
- struct bpf_object *bpf_object__open_buffer(void *obj_buf,
- size_t obj_buf_sz,
- const char *name)
- {
- char tmp_name[64];
- /* param validation */
- if (!obj_buf || obj_buf_sz <= 0)
- return NULL;
- if (!name) {
- snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx",
- (unsigned long)obj_buf,
- (unsigned long)obj_buf_sz);
- tmp_name[sizeof(tmp_name) - 1] = '\0';
- name = tmp_name;
- }
- pr_debug("loading object '%s' from buffer\n",
- name);
- return __bpf_object__open(name, obj_buf, obj_buf_sz, true);
- }
- int bpf_object__unload(struct bpf_object *obj)
- {
- size_t i;
- if (!obj)
- return -EINVAL;
- for (i = 0; i < obj->nr_maps; i++)
- zclose(obj->maps[i].fd);
- for (i = 0; i < obj->nr_programs; i++)
- bpf_program__unload(&obj->programs[i]);
- return 0;
- }
- int bpf_object__load(struct bpf_object *obj)
- {
- int err;
- if (!obj)
- return -EINVAL;
- if (obj->loaded) {
- pr_warning("object should not be loaded twice\n");
- return -EINVAL;
- }
- obj->loaded = true;
- CHECK_ERR(bpf_object__create_maps(obj), err, out);
- CHECK_ERR(bpf_object__relocate(obj), err, out);
- CHECK_ERR(bpf_object__load_progs(obj), err, out);
- return 0;
- out:
- bpf_object__unload(obj);
- pr_warning("failed to load object '%s'\n", obj->path);
- return err;
- }
- static int check_path(const char *path)
- {
- char *cp, errmsg[STRERR_BUFSIZE];
- struct statfs st_fs;
- char *dname, *dir;
- int err = 0;
- if (path == NULL)
- return -EINVAL;
- dname = strdup(path);
- if (dname == NULL)
- return -ENOMEM;
- dir = dirname(dname);
- if (statfs(dir, &st_fs)) {
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("failed to statfs %s: %s\n", dir, cp);
- err = -errno;
- }
- free(dname);
- if (!err && st_fs.f_type != BPF_FS_MAGIC) {
- pr_warning("specified path %s is not on BPF FS\n", path);
- err = -EINVAL;
- }
- return err;
- }
- int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
- int instance)
- {
- char *cp, errmsg[STRERR_BUFSIZE];
- int err;
- err = check_path(path);
- if (err)
- return err;
- if (prog == NULL) {
- pr_warning("invalid program pointer\n");
- return -EINVAL;
- }
- if (instance < 0 || instance >= prog->instances.nr) {
- pr_warning("invalid prog instance %d of prog %s (max %d)\n",
- instance, prog->section_name, prog->instances.nr);
- return -EINVAL;
- }
- if (bpf_obj_pin(prog->instances.fds[instance], path)) {
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("failed to pin program: %s\n", cp);
- return -errno;
- }
- pr_debug("pinned program '%s'\n", path);
- return 0;
- }
- static int make_dir(const char *path)
- {
- char *cp, errmsg[STRERR_BUFSIZE];
- int err = 0;
- if (mkdir(path, 0700) && errno != EEXIST)
- err = -errno;
- if (err) {
- cp = str_error(-err, errmsg, sizeof(errmsg));
- pr_warning("failed to mkdir %s: %s\n", path, cp);
- }
- return err;
- }
- int bpf_program__pin(struct bpf_program *prog, const char *path)
- {
- int i, err;
- err = check_path(path);
- if (err)
- return err;
- if (prog == NULL) {
- pr_warning("invalid program pointer\n");
- return -EINVAL;
- }
- if (prog->instances.nr <= 0) {
- pr_warning("no instances of prog %s to pin\n",
- prog->section_name);
- return -EINVAL;
- }
- err = make_dir(path);
- if (err)
- return err;
- for (i = 0; i < prog->instances.nr; i++) {
- char buf[PATH_MAX];
- int len;
- len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
- if (len < 0)
- return -EINVAL;
- else if (len >= PATH_MAX)
- return -ENAMETOOLONG;
- err = bpf_program__pin_instance(prog, buf, i);
- if (err)
- return err;
- }
- return 0;
- }
- int bpf_map__pin(struct bpf_map *map, const char *path)
- {
- char *cp, errmsg[STRERR_BUFSIZE];
- int err;
- err = check_path(path);
- if (err)
- return err;
- if (map == NULL) {
- pr_warning("invalid map pointer\n");
- return -EINVAL;
- }
- if (bpf_obj_pin(map->fd, path)) {
- cp = str_error(errno, errmsg, sizeof(errmsg));
- pr_warning("failed to pin map: %s\n", cp);
- return -errno;
- }
- pr_debug("pinned map '%s'\n", path);
- return 0;
- }
- int bpf_object__pin(struct bpf_object *obj, const char *path)
- {
- struct bpf_program *prog;
- struct bpf_map *map;
- int err;
- if (!obj)
- return -ENOENT;
- if (!obj->loaded) {
- pr_warning("object not yet loaded; load it first\n");
- return -ENOENT;
- }
- err = make_dir(path);
- if (err)
- return err;
- bpf_map__for_each(map, obj) {
- char buf[PATH_MAX];
- int len;
- len = snprintf(buf, PATH_MAX, "%s/%s", path,
- bpf_map__name(map));
- if (len < 0)
- return -EINVAL;
- else if (len >= PATH_MAX)
- return -ENAMETOOLONG;
- err = bpf_map__pin(map, buf);
- if (err)
- return err;
- }
- bpf_object__for_each_program(prog, obj) {
- char buf[PATH_MAX];
- int len;
- len = snprintf(buf, PATH_MAX, "%s/%s", path,
- prog->section_name);
- if (len < 0)
- return -EINVAL;
- else if (len >= PATH_MAX)
- return -ENAMETOOLONG;
- err = bpf_program__pin(prog, buf);
- if (err)
- return err;
- }
- return 0;
- }
- void bpf_object__close(struct bpf_object *obj)
- {
- size_t i;
- if (!obj)
- return;
- if (obj->clear_priv)
- obj->clear_priv(obj, obj->priv);
- bpf_object__elf_finish(obj);
- bpf_object__unload(obj);
- btf__free(obj->btf);
- for (i = 0; i < obj->nr_maps; i++) {
- zfree(&obj->maps[i].name);
- if (obj->maps[i].clear_priv)
- obj->maps[i].clear_priv(&obj->maps[i],
- obj->maps[i].priv);
- obj->maps[i].priv = NULL;
- obj->maps[i].clear_priv = NULL;
- }
- zfree(&obj->maps);
- obj->nr_maps = 0;
- if (obj->programs && obj->nr_programs) {
- for (i = 0; i < obj->nr_programs; i++)
- bpf_program__exit(&obj->programs[i]);
- }
- zfree(&obj->programs);
- list_del(&obj->list);
- free(obj);
- }
- struct bpf_object *
- bpf_object__next(struct bpf_object *prev)
- {
- struct bpf_object *next;
- if (!prev)
- next = list_first_entry(&bpf_objects_list,
- struct bpf_object,
- list);
- else
- next = list_next_entry(prev, list);
- /* Empty list is noticed here so don't need checking on entry. */
- if (&next->list == &bpf_objects_list)
- return NULL;
- return next;
- }
- const char *bpf_object__name(struct bpf_object *obj)
- {
- return obj ? obj->path : ERR_PTR(-EINVAL);
- }
- unsigned int bpf_object__kversion(struct bpf_object *obj)
- {
- return obj ? obj->kern_version : 0;
- }
- int bpf_object__btf_fd(const struct bpf_object *obj)
- {
- return obj->btf ? btf__fd(obj->btf) : -1;
- }
- int bpf_object__set_priv(struct bpf_object *obj, void *priv,
- bpf_object_clear_priv_t clear_priv)
- {
- if (obj->priv && obj->clear_priv)
- obj->clear_priv(obj, obj->priv);
- obj->priv = priv;
- obj->clear_priv = clear_priv;
- return 0;
- }
- void *bpf_object__priv(struct bpf_object *obj)
- {
- return obj ? obj->priv : ERR_PTR(-EINVAL);
- }
- static struct bpf_program *
- __bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
- {
- size_t idx;
- if (!obj->programs)
- return NULL;
- /* First handler */
- if (prev == NULL)
- return &obj->programs[0];
- if (prev->obj != obj) {
- pr_warning("error: program handler doesn't match object\n");
- return NULL;
- }
- idx = (prev - obj->programs) + 1;
- if (idx >= obj->nr_programs)
- return NULL;
- return &obj->programs[idx];
- }
- struct bpf_program *
- bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
- {
- struct bpf_program *prog = prev;
- do {
- prog = __bpf_program__next(prog, obj);
- } while (prog && bpf_program__is_function_storage(prog, obj));
- return prog;
- }
- int bpf_program__set_priv(struct bpf_program *prog, void *priv,
- bpf_program_clear_priv_t clear_priv)
- {
- if (prog->priv && prog->clear_priv)
- prog->clear_priv(prog, prog->priv);
- prog->priv = priv;
- prog->clear_priv = clear_priv;
- return 0;
- }
- void *bpf_program__priv(struct bpf_program *prog)
- {
- return prog ? prog->priv : ERR_PTR(-EINVAL);
- }
- void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex)
- {
- prog->prog_ifindex = ifindex;
- }
- const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
- {
- const char *title;
- title = prog->section_name;
- if (needs_copy) {
- title = strdup(title);
- if (!title) {
- pr_warning("failed to strdup program title\n");
- return ERR_PTR(-ENOMEM);
- }
- }
- return title;
- }
- int bpf_program__fd(struct bpf_program *prog)
- {
- return bpf_program__nth_fd(prog, 0);
- }
- int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
- bpf_program_prep_t prep)
- {
- int *instances_fds;
- if (nr_instances <= 0 || !prep)
- return -EINVAL;
- if (prog->instances.nr > 0 || prog->instances.fds) {
- pr_warning("Can't set pre-processor after loading\n");
- return -EINVAL;
- }
- instances_fds = malloc(sizeof(int) * nr_instances);
- if (!instances_fds) {
- pr_warning("alloc memory failed for fds\n");
- return -ENOMEM;
- }
- /* fill all fd with -1 */
- memset(instances_fds, -1, sizeof(int) * nr_instances);
- prog->instances.nr = nr_instances;
- prog->instances.fds = instances_fds;
- prog->preprocessor = prep;
- return 0;
- }
- int bpf_program__nth_fd(struct bpf_program *prog, int n)
- {
- int fd;
- if (!prog)
- return -EINVAL;
- if (n >= prog->instances.nr || n < 0) {
- pr_warning("Can't get the %dth fd from program %s: only %d instances\n",
- n, prog->section_name, prog->instances.nr);
- return -EINVAL;
- }
- fd = prog->instances.fds[n];
- if (fd < 0) {
- pr_warning("%dth instance of program '%s' is invalid\n",
- n, prog->section_name);
- return -ENOENT;
- }
- return fd;
- }
- void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type)
- {
- prog->type = type;
- }
- static bool bpf_program__is_type(struct bpf_program *prog,
- enum bpf_prog_type type)
- {
- return prog ? (prog->type == type) : false;
- }
- #define BPF_PROG_TYPE_FNS(NAME, TYPE) \
- int bpf_program__set_##NAME(struct bpf_program *prog) \
- { \
- if (!prog) \
- return -EINVAL; \
- bpf_program__set_type(prog, TYPE); \
- return 0; \
- } \
- \
- bool bpf_program__is_##NAME(struct bpf_program *prog) \
- { \
- return bpf_program__is_type(prog, TYPE); \
- } \
- BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER);
- BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE);
- BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS);
- BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT);
- BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT);
- BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT);
- BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP);
- BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
- void bpf_program__set_expected_attach_type(struct bpf_program *prog,
- enum bpf_attach_type type)
- {
- prog->expected_attach_type = type;
- }
- #define BPF_PROG_SEC_FULL(string, ptype, atype) \
- { string, sizeof(string) - 1, ptype, atype }
- #define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_FULL(string, ptype, 0)
- #define BPF_S_PROG_SEC(string, ptype) \
- BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK, ptype)
- #define BPF_SA_PROG_SEC(string, ptype) \
- BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, ptype)
- static const struct {
- const char *sec;
- size_t len;
- enum bpf_prog_type prog_type;
- enum bpf_attach_type expected_attach_type;
- } section_names[] = {
- BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER),
- BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE),
- BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE),
- BPF_PROG_SEC("classifier", BPF_PROG_TYPE_SCHED_CLS),
- BPF_PROG_SEC("action", BPF_PROG_TYPE_SCHED_ACT),
- BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT),
- BPF_PROG_SEC("raw_tracepoint/", BPF_PROG_TYPE_RAW_TRACEPOINT),
- BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP),
- BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT),
- BPF_PROG_SEC("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB),
- BPF_PROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK),
- BPF_PROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE),
- BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN),
- BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT),
- BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT),
- BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL),
- BPF_PROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS),
- BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB),
- BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG),
- BPF_PROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2),
- BPF_SA_PROG_SEC("cgroup/bind4", BPF_CGROUP_INET4_BIND),
- BPF_SA_PROG_SEC("cgroup/bind6", BPF_CGROUP_INET6_BIND),
- BPF_SA_PROG_SEC("cgroup/connect4", BPF_CGROUP_INET4_CONNECT),
- BPF_SA_PROG_SEC("cgroup/connect6", BPF_CGROUP_INET6_CONNECT),
- BPF_SA_PROG_SEC("cgroup/sendmsg4", BPF_CGROUP_UDP4_SENDMSG),
- BPF_SA_PROG_SEC("cgroup/sendmsg6", BPF_CGROUP_UDP6_SENDMSG),
- BPF_S_PROG_SEC("cgroup/post_bind4", BPF_CGROUP_INET4_POST_BIND),
- BPF_S_PROG_SEC("cgroup/post_bind6", BPF_CGROUP_INET6_POST_BIND),
- };
- #undef BPF_PROG_SEC
- #undef BPF_PROG_SEC_FULL
- #undef BPF_S_PROG_SEC
- #undef BPF_SA_PROG_SEC
- 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 (!name)
- return -EINVAL;
- 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;
- }
- 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)
- {
- return map ? map->fd : -EINVAL;
- }
- const struct bpf_map_def *bpf_map__def(struct bpf_map *map)
- {
- return map ? &map->def : ERR_PTR(-EINVAL);
- }
- const char *bpf_map__name(struct bpf_map *map)
- {
- return map ? map->name : NULL;
- }
- __u32 bpf_map__btf_key_type_id(const struct bpf_map *map)
- {
- return map ? map->btf_key_type_id : 0;
- }
- __u32 bpf_map__btf_value_type_id(const struct bpf_map *map)
- {
- return map ? map->btf_value_type_id : 0;
- }
- int bpf_map__set_priv(struct bpf_map *map, void *priv,
- bpf_map_clear_priv_t clear_priv)
- {
- if (!map)
- return -EINVAL;
- if (map->priv) {
- if (map->clear_priv)
- map->clear_priv(map, map->priv);
- }
- map->priv = priv;
- map->clear_priv = clear_priv;
- return 0;
- }
- 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;
- }
- struct bpf_map *
- bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
- {
- size_t idx;
- struct bpf_map *s, *e;
- if (!obj || !obj->maps)
- return NULL;
- s = obj->maps;
- e = obj->maps + obj->nr_maps;
- if (prev == NULL)
- return s;
- if ((prev < s) || (prev >= e)) {
- pr_warning("error in %s: map handler doesn't belong to object\n",
- __func__);
- return NULL;
- }
- idx = (prev - obj->maps) + 1;
- if (idx >= obj->nr_maps)
- return NULL;
- return &obj->maps[idx];
- }
- struct bpf_map *
- bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
- {
- struct bpf_map *pos;
- bpf_map__for_each(pos, obj) {
- if (pos->name && !strcmp(pos->name, name))
- return pos;
- }
- return NULL;
- }
- struct bpf_map *
- bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
- {
- int i;
- for (i = 0; i < obj->nr_maps; i++) {
- if (obj->maps[i].offset == offset)
- return &obj->maps[i];
- }
- return ERR_PTR(-ENOENT);
- }
- long libbpf_get_error(const void *ptr)
- {
- if (IS_ERR(ptr))
- return PTR_ERR(ptr);
- return 0;
- }
- int bpf_prog_load(const char *file, enum bpf_prog_type type,
- struct bpf_object **pobj, int *prog_fd)
- {
- struct bpf_prog_load_attr attr;
- memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
- attr.file = file;
- attr.prog_type = type;
- attr.expected_attach_type = 0;
- return bpf_prog_load_xattr(&attr, pobj, prog_fd);
- }
- 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 = {};
- 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 err;
- if (!attr)
- return -EINVAL;
- if (!attr->file)
- return -EINVAL;
- open_attr.file = attr->file;
- open_attr.prog_type = attr->prog_type;
- obj = bpf_object__open_xattr(&open_attr);
- if (IS_ERR_OR_NULL(obj))
- return -ENOENT;
- bpf_object__for_each_program(prog, obj) {
- /*
- * If type is not specified, try to guess it based on
- * section name.
- */
- prog_type = attr->prog_type;
- prog->prog_ifindex = attr->ifindex;
- expected_attach_type = attr->expected_attach_type;
- if (prog_type == BPF_PROG_TYPE_UNSPEC) {
- 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;
- }
- }
- bpf_program__set_type(prog, prog_type);
- bpf_program__set_expected_attach_type(prog,
- expected_attach_type);
- if (!bpf_program__is_function_storage(prog, obj) && !first_prog)
- first_prog = prog;
- }
- bpf_map__for_each(map, obj) {
- if (!bpf_map__is_offload_neutral(map))
- map->map_ifindex = attr->ifindex;
- }
- if (!first_prog) {
- pr_warning("object file doesn't contain bpf program\n");
- bpf_object__close(obj);
- return -ENOENT;
- }
- err = bpf_object__load(obj);
- if (err) {
- bpf_object__close(obj);
- return -EINVAL;
- }
- *pobj = obj;
- *prog_fd = bpf_program__fd(first_prog);
- return 0;
- }
- enum bpf_perf_event_ret
- bpf_perf_event_read_simple(void *mem, unsigned long size,
- unsigned long page_size, void **buf, size_t *buf_len,
- bpf_perf_event_print_t fn, void *priv)
- {
- volatile struct perf_event_mmap_page *header = mem;
- __u64 data_tail = header->data_tail;
- __u64 data_head = header->data_head;
- int ret = LIBBPF_PERF_EVENT_ERROR;
- void *base, *begin, *end;
- asm volatile("" ::: "memory"); /* in real code it should be smp_rmb() */
- if (data_head == data_tail)
- return LIBBPF_PERF_EVENT_CONT;
- base = ((char *)header) + page_size;
- begin = base + data_tail % size;
- end = base + data_head % size;
- while (begin != end) {
- struct perf_event_header *ehdr;
- ehdr = begin;
- if (begin + ehdr->size > base + size) {
- long len = base + size - begin;
- if (*buf_len < ehdr->size) {
- free(*buf);
- *buf = malloc(ehdr->size);
- if (!*buf) {
- ret = LIBBPF_PERF_EVENT_ERROR;
- break;
- }
- *buf_len = ehdr->size;
- }
- memcpy(*buf, begin, len);
- memcpy(*buf + len, base, ehdr->size - len);
- ehdr = (void *)*buf;
- begin = base + ehdr->size - len;
- } else if (begin + ehdr->size == base + size) {
- begin = base;
- } else {
- begin += ehdr->size;
- }
- ret = fn(ehdr, priv);
- if (ret != LIBBPF_PERF_EVENT_CONT)
- break;
- data_tail += ehdr->size;
- }
- __sync_synchronize(); /* smp_mb() */
- header->data_tail = data_tail;
- return ret;
- }
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