![Hechao Li](/assets/img/avatar_default.png)
Use the newly added bpf_num_possible_cpus() in bpftool and selftests and remove duplicate implementations. Signed-off-by: Hechao Li <hechaol@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
596 lines
11 KiB
C
596 lines
11 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <libgen.h>
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#include <mntent.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/limits.h>
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#include <linux/magic.h>
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#include <net/if.h>
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#include <sys/mount.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <bpf.h>
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#include <libbpf.h> /* libbpf_num_possible_cpus */
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#include "main.h"
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#ifndef BPF_FS_MAGIC
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#define BPF_FS_MAGIC 0xcafe4a11
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#endif
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void __printf(1, 2) p_err(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (json_output) {
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jsonw_start_object(json_wtr);
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jsonw_name(json_wtr, "error");
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jsonw_vprintf_enquote(json_wtr, fmt, ap);
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jsonw_end_object(json_wtr);
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} else {
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fprintf(stderr, "Error: ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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}
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va_end(ap);
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}
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void __printf(1, 2) p_info(const char *fmt, ...)
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{
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va_list ap;
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if (json_output)
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return;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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}
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static bool is_bpffs(char *path)
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{
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struct statfs st_fs;
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if (statfs(path, &st_fs) < 0)
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return false;
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return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
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}
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void set_max_rlimit(void)
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{
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struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
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setrlimit(RLIMIT_MEMLOCK, &rinf);
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}
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static int
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mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
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{
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bool bind_done = false;
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while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
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if (errno != EINVAL || bind_done) {
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snprintf(buff, bufflen,
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"mount --make-private %s failed: %s",
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target, strerror(errno));
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return -1;
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}
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if (mount(target, target, "none", MS_BIND, NULL)) {
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snprintf(buff, bufflen,
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"mount --bind %s %s failed: %s",
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target, target, strerror(errno));
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return -1;
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}
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bind_done = true;
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}
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if (mount(type, target, type, 0, "mode=0700")) {
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snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
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type, type, target, strerror(errno));
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return -1;
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}
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return 0;
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}
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int mount_tracefs(const char *target)
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{
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char err_str[ERR_MAX_LEN];
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int err;
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err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
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if (err) {
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err_str[ERR_MAX_LEN - 1] = '\0';
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p_err("can't mount tracefs: %s", err_str);
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}
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return err;
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}
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int open_obj_pinned(char *path, bool quiet)
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{
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int fd;
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fd = bpf_obj_get(path);
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if (fd < 0) {
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if (!quiet)
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p_err("bpf obj get (%s): %s", path,
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errno == EACCES && !is_bpffs(dirname(path)) ?
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"directory not in bpf file system (bpffs)" :
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strerror(errno));
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return -1;
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}
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return fd;
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}
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int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
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{
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enum bpf_obj_type type;
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int fd;
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fd = open_obj_pinned(path, false);
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if (fd < 0)
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return -1;
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type = get_fd_type(fd);
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if (type < 0) {
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close(fd);
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return type;
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}
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if (type != exp_type) {
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p_err("incorrect object type: %s", get_fd_type_name(type));
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close(fd);
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return -1;
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}
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return fd;
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}
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int mount_bpffs_for_pin(const char *name)
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{
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char err_str[ERR_MAX_LEN];
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char *file;
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char *dir;
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int err = 0;
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file = malloc(strlen(name) + 1);
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strcpy(file, name);
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dir = dirname(file);
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if (is_bpffs(dir))
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/* nothing to do if already mounted */
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goto out_free;
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if (block_mount) {
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p_err("no BPF file system found, not mounting it due to --nomount option");
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err = -1;
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goto out_free;
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}
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err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
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if (err) {
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err_str[ERR_MAX_LEN - 1] = '\0';
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p_err("can't mount BPF file system to pin the object (%s): %s",
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name, err_str);
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}
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out_free:
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free(file);
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return err;
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}
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int do_pin_fd(int fd, const char *name)
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{
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int err;
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err = mount_bpffs_for_pin(name);
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if (err)
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return err;
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return bpf_obj_pin(fd, name);
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}
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int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
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{
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unsigned int id;
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char *endptr;
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int err;
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int fd;
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if (argc < 3) {
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p_err("too few arguments, id ID and FILE path is required");
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return -1;
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} else if (argc > 3) {
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p_err("too many arguments");
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return -1;
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}
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if (!is_prefix(*argv, "id")) {
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p_err("expected 'id' got %s", *argv);
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return -1;
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}
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NEXT_ARG();
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id = strtoul(*argv, &endptr, 0);
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if (*endptr) {
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p_err("can't parse %s as ID", *argv);
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return -1;
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}
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NEXT_ARG();
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fd = get_fd_by_id(id);
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if (fd < 0) {
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p_err("can't get prog by id (%u): %s", id, strerror(errno));
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return -1;
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}
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err = do_pin_fd(fd, *argv);
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close(fd);
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return err;
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}
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const char *get_fd_type_name(enum bpf_obj_type type)
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{
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static const char * const names[] = {
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[BPF_OBJ_UNKNOWN] = "unknown",
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[BPF_OBJ_PROG] = "prog",
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[BPF_OBJ_MAP] = "map",
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};
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if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
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return names[BPF_OBJ_UNKNOWN];
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return names[type];
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}
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int get_fd_type(int fd)
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{
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char path[PATH_MAX];
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char buf[512];
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ssize_t n;
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snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
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n = readlink(path, buf, sizeof(buf));
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if (n < 0) {
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p_err("can't read link type: %s", strerror(errno));
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return -1;
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}
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if (n == sizeof(path)) {
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p_err("can't read link type: path too long!");
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return -1;
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}
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if (strstr(buf, "bpf-map"))
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return BPF_OBJ_MAP;
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else if (strstr(buf, "bpf-prog"))
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return BPF_OBJ_PROG;
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return BPF_OBJ_UNKNOWN;
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}
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char *get_fdinfo(int fd, const char *key)
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{
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char path[PATH_MAX];
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char *line = NULL;
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size_t line_n = 0;
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ssize_t n;
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FILE *fdi;
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snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
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fdi = fopen(path, "r");
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if (!fdi)
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return NULL;
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while ((n = getline(&line, &line_n, fdi)) > 0) {
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char *value;
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int len;
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if (!strstr(line, key))
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continue;
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fclose(fdi);
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value = strchr(line, '\t');
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if (!value || !value[1]) {
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free(line);
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return NULL;
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}
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value++;
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len = strlen(value);
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memmove(line, value, len);
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line[len - 1] = '\0';
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return line;
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}
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free(line);
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fclose(fdi);
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return NULL;
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}
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void print_data_json(uint8_t *data, size_t len)
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{
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unsigned int i;
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jsonw_start_array(json_wtr);
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for (i = 0; i < len; i++)
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jsonw_printf(json_wtr, "%d", data[i]);
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jsonw_end_array(json_wtr);
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}
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void print_hex_data_json(uint8_t *data, size_t len)
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{
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unsigned int i;
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jsonw_start_array(json_wtr);
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for (i = 0; i < len; i++)
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jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
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jsonw_end_array(json_wtr);
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}
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int build_pinned_obj_table(struct pinned_obj_table *tab,
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enum bpf_obj_type type)
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{
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struct bpf_prog_info pinned_info = {};
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struct pinned_obj *obj_node = NULL;
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__u32 len = sizeof(pinned_info);
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struct mntent *mntent = NULL;
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enum bpf_obj_type objtype;
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FILE *mntfile = NULL;
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FTSENT *ftse = NULL;
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FTS *fts = NULL;
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int fd, err;
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mntfile = setmntent("/proc/mounts", "r");
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if (!mntfile)
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return -1;
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while ((mntent = getmntent(mntfile))) {
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char *path[] = { mntent->mnt_dir, NULL };
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if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
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continue;
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fts = fts_open(path, 0, NULL);
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if (!fts)
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continue;
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while ((ftse = fts_read(fts))) {
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if (!(ftse->fts_info & FTS_F))
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continue;
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fd = open_obj_pinned(ftse->fts_path, true);
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if (fd < 0)
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continue;
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objtype = get_fd_type(fd);
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if (objtype != type) {
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close(fd);
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continue;
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}
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memset(&pinned_info, 0, sizeof(pinned_info));
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err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
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if (err) {
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close(fd);
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continue;
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}
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obj_node = malloc(sizeof(*obj_node));
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if (!obj_node) {
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close(fd);
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fts_close(fts);
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fclose(mntfile);
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return -1;
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}
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memset(obj_node, 0, sizeof(*obj_node));
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obj_node->id = pinned_info.id;
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obj_node->path = strdup(ftse->fts_path);
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hash_add(tab->table, &obj_node->hash, obj_node->id);
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close(fd);
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}
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fts_close(fts);
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}
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fclose(mntfile);
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return 0;
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}
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void delete_pinned_obj_table(struct pinned_obj_table *tab)
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{
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struct pinned_obj *obj;
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struct hlist_node *tmp;
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unsigned int bkt;
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hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
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hash_del(&obj->hash);
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free(obj->path);
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free(obj);
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}
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}
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unsigned int get_page_size(void)
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{
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static int result;
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if (!result)
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result = getpagesize();
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return result;
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}
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unsigned int get_possible_cpus(void)
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{
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int cpus = libbpf_num_possible_cpus();
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if (cpus < 0) {
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p_err("Can't get # of possible cpus: %s", strerror(-cpus));
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exit(-1);
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}
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return cpus;
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}
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static char *
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ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
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{
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struct stat st;
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int err;
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err = stat("/proc/self/ns/net", &st);
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if (err) {
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p_err("Can't stat /proc/self: %s", strerror(errno));
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return NULL;
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}
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if (st.st_dev != ns_dev || st.st_ino != ns_ino)
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return NULL;
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return if_indextoname(ifindex, buf);
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}
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static int read_sysfs_hex_int(char *path)
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{
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char vendor_id_buf[8];
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int len;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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p_err("Can't open %s: %s", path, strerror(errno));
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return -1;
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}
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len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
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close(fd);
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if (len < 0) {
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p_err("Can't read %s: %s", path, strerror(errno));
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return -1;
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}
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if (len >= (int)sizeof(vendor_id_buf)) {
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p_err("Value in %s too long", path);
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return -1;
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}
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vendor_id_buf[len] = 0;
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return strtol(vendor_id_buf, NULL, 0);
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}
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static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
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{
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char full_path[64];
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snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
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devname, entry_name);
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return read_sysfs_hex_int(full_path);
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}
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const char *
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ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
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const char **opt)
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{
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char devname[IF_NAMESIZE];
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int vendor_id;
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int device_id;
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if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
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p_err("Can't get net device name for ifindex %d: %s", ifindex,
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strerror(errno));
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return NULL;
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}
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vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
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if (vendor_id < 0) {
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p_err("Can't get device vendor id for %s", devname);
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return NULL;
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}
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switch (vendor_id) {
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case 0x19ee:
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device_id = read_sysfs_netdev_hex_int(devname, "device");
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if (device_id != 0x4000 &&
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device_id != 0x6000 &&
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device_id != 0x6003)
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p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
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*opt = "ctx4";
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return "NFP-6xxx";
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default:
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p_err("Can't get bfd arch name for device vendor id 0x%04x",
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vendor_id);
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return NULL;
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}
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}
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void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
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{
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char name[IF_NAMESIZE];
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if (!ifindex)
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return;
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printf(" offloaded_to ");
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if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
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printf("%s", name);
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else
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printf("ifindex %u ns_dev %llu ns_ino %llu",
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ifindex, ns_dev, ns_inode);
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}
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void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
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{
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char name[IF_NAMESIZE];
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if (!ifindex)
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return;
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|
|
|
jsonw_name(json_wtr, "dev");
|
|
jsonw_start_object(json_wtr);
|
|
jsonw_uint_field(json_wtr, "ifindex", ifindex);
|
|
jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
|
|
jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
|
|
if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
|
|
jsonw_string_field(json_wtr, "ifname", name);
|
|
jsonw_end_object(json_wtr);
|
|
}
|
|
|
|
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
|
|
{
|
|
char *endptr;
|
|
|
|
NEXT_ARGP();
|
|
|
|
if (*val) {
|
|
p_err("%s already specified", what);
|
|
return -1;
|
|
}
|
|
|
|
*val = strtoul(**argv, &endptr, 0);
|
|
if (*endptr) {
|
|
p_err("can't parse %s as %s", **argv, what);
|
|
return -1;
|
|
}
|
|
NEXT_ARGP();
|
|
|
|
return 0;
|
|
}
|