/*
* Copyright (C) 2017-2018 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <libgen.h>
#include <mntent.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
#include <linux/magic.h>
#include <net/if.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <bpf.h>
#include "main.h"
#ifndef BPF_FS_MAGIC
#define BPF_FS_MAGIC 0xcafe4a11
#endif
void p_err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "error");
jsonw_vprintf_enquote(json_wtr, fmt, ap);
jsonw_end_object(json_wtr);
} else {
fprintf(stderr, "Error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
}
va_end(ap);
}
void p_info(const char *fmt, ...)
{
va_list ap;
if (json_output)
return;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
static bool is_bpffs(char *path)
{
struct statfs st_fs;
if (statfs(path, &st_fs) < 0)
return false;
return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
}
static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
{
bool bind_done = false;
while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
if (errno != EINVAL || bind_done) {
snprintf(buff, bufflen,
"mount --make-private %s failed: %s",
target, strerror(errno));
return -1;
}
if (mount(target, target, "none", MS_BIND, NULL)) {
snprintf(buff, bufflen,
"mount --bind %s %s failed: %s",
target, target, strerror(errno));
return -1;
}
bind_done = true;
}
if (mount("bpf", target, "bpf", 0, "mode=0700")) {
snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
target, strerror(errno));
return -1;
}
return 0;
}
int open_obj_pinned(char *path)
{
int fd;
fd = bpf_obj_get(path);
if (fd < 0) {
p_err("bpf obj get (%s): %s", path,
errno == EACCES && !is_bpffs(dirname(path)) ?
"directory not in bpf file system (bpffs)" :
strerror(errno));
return -1;
}
return fd;
}
int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
{
enum bpf_obj_type type;
int fd;
fd = open_obj_pinned(path);
if (fd < 0)
return -1;
type = get_fd_type(fd);
if (type < 0) {
close(fd);
return type;
}
if (type != exp_type) {
p_err("incorrect object type: %s", get_fd_type_name(type));
close(fd);
return -1;
}
return fd;
}
int do_pin_fd(int fd, const char *name)
{
char err_str[ERR_MAX_LEN];
char *file;
char *dir;
int err = 0;
err = bpf_obj_pin(fd, name);
if (!err)
goto out;
file = malloc(strlen(name) + 1);
strcpy(file, name);
dir = dirname(file);
if (errno != EPERM || is_bpffs(dir)) {
p_err("can't pin the object (%s): %s", name, strerror(errno));
goto out_free;
}
/* Attempt to mount bpffs, then retry pinning. */
err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
if (!err) {
err = bpf_obj_pin(fd, name);
if (err)
p_err("can't pin the object (%s): %s", name,
strerror(errno));
} else {
err_str[ERR_MAX_LEN - 1] = '\0';
p_err("can't mount BPF file system to pin the object (%s): %s",
name, err_str);
}
out_free:
free(file);
out:
return err;
}
int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
{
unsigned int id;
char *endptr;
int err;
int fd;
if (argc < 3) {
p_err("too few arguments, id ID and FILE path is required");
return -1;
} else if (argc > 3) {
p_err("too many arguments");
return -1;
}
if (!is_prefix(*argv, "id")) {
p_err("expected 'id' got %s", *argv);
return -1;
}
NEXT_ARG();
id = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", *argv);
return -1;
}
NEXT_ARG();
fd = get_fd_by_id(id);
if (fd < 0) {
p_err("can't get prog by id (%u): %s", id, strerror(errno));
return -1;
}
err = do_pin_fd(fd, *argv);
close(fd);
return err;
}
const char *get_fd_type_name(enum bpf_obj_type type)
{
static const char * const names[] = {
[BPF_OBJ_UNKNOWN] = "unknown",
[BPF_OBJ_PROG] = "prog",
[BPF_OBJ_MAP] = "map",
};
if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
return names[BPF_OBJ_UNKNOWN];
return names[type];
}
int get_fd_type(int fd)
{
char path[PATH_MAX];
char buf[512];
ssize_t n;
snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
n = readlink(path, buf, sizeof(buf));
if (n < 0) {
p_err("can't read link type: %s", strerror(errno));
return -1;
}
if (n == sizeof(path)) {
p_err("can't read link type: path too long!");
return -1;
}
if (strstr(buf, "bpf-map"))
return BPF_OBJ_MAP;
else if (strstr(buf, "bpf-prog"))
return BPF_OBJ_PROG;
return BPF_OBJ_UNKNOWN;
}
char *get_fdinfo(int fd, const char *key)
{
char path[PATH_MAX];
char *line = NULL;
size_t line_n = 0;
ssize_t n;
FILE *fdi;
snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
fdi = fopen(path, "r");
if (!fdi) {
p_err("can't open fdinfo: %s", strerror(errno));
return NULL;
}
while ((n = getline(&line, &line_n, fdi)) > 0) {
char *value;
int len;
if (!strstr(line, key))
continue;
fclose(fdi);
value = strchr(line, '\t');
if (!value || !value[1]) {
p_err("malformed fdinfo!?");
free(line);
return NULL;
}
value++;
len = strlen(value);
memmove(line, value, len);
line[len - 1] = '\0';
return line;
}
p_err("key '%s' not found in fdinfo", key);
free(line);
fclose(fdi);
return NULL;
}
void print_data_json(uint8_t *data, size_t len)
{
unsigned int i;
jsonw_start_array(json_wtr);
for (i = 0; i < len; i++)
jsonw_printf(json_wtr, "%d", data[i]);
jsonw_end_array(json_wtr);
}
void print_hex_data_json(uint8_t *data, size_t len)
{
unsigned int i;
jsonw_start_array(json_wtr);
for (i = 0; i < len; i++)
jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
jsonw_end_array(json_wtr);
}
int build_pinned_obj_table(struct pinned_obj_table *tab,
enum bpf_obj_type type)
{
struct bpf_prog_info pinned_info = {};
struct pinned_obj *obj_node = NULL;
__u32 len = sizeof(pinned_info);
struct mntent *mntent = NULL;
enum bpf_obj_type objtype;
FILE *mntfile = NULL;
FTSENT *ftse = NULL;
FTS *fts = NULL;
int fd, err;
mntfile = setmntent("/proc/mounts", "r");
if (!mntfile)
return -1;
while ((mntent = getmntent(mntfile))) {
char *path[] = { mntent->mnt_dir, NULL };
if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
continue;
fts = fts_open(path, 0, NULL);
if (!fts)
continue;
while ((ftse = fts_read(fts))) {
if (!(ftse->fts_info & FTS_F))
continue;
fd = open_obj_pinned(ftse->fts_path);
if (fd < 0)
continue;
objtype = get_fd_type(fd);
if (objtype != type) {
close(fd);
continue;
}
memset(&pinned_info, 0, sizeof(pinned_info));
err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
if (err) {
close(fd);
continue;
}
obj_node = malloc(sizeof(*obj_node));
if (!obj_node) {
close(fd);
fts_close(fts);
fclose(mntfile);
return -1;
}
memset(obj_node, 0, sizeof(*obj_node));
obj_node->id = pinned_info.id;
obj_node->path = strdup(ftse->fts_path);
hash_add(tab->table, &obj_node->hash, obj_node->id);
close(fd);
}
fts_close(fts);
}
fclose(mntfile);
return 0;
}
void delete_pinned_obj_table(struct pinned_obj_table *tab)
{
struct pinned_obj *obj;
struct hlist_node *tmp;
unsigned int bkt;
hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
hash_del(&obj->hash);
free(obj->path);
free(obj);
}
}
unsigned int get_page_size(void)
{
static int result;
if (!result)
result = getpagesize();
return result;
}
unsigned int get_possible_cpus(void)
{
static unsigned int result;
char buf[128];
long int n;
char *ptr;
int fd;
if (result)
return result;
fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
if (fd < 0) {
p_err("can't open sysfs possible cpus");
exit(-1);
}
n = read(fd, buf, sizeof(buf));
if (n < 2) {
p_err("can't read sysfs possible cpus");
exit(-1);
}
close(fd);
if (n == sizeof(buf)) {
p_err("read sysfs possible cpus overflow");
exit(-1);
}
ptr = buf;
n = 0;
while (*ptr && *ptr != '\n') {
unsigned int a, b;
if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
n += b - a + 1;
ptr = strchr(ptr, '-') + 1;
} else if (sscanf(ptr, "%u", &a) == 1) {
n++;
} else {
assert(0);
}
while (isdigit(*ptr))
ptr++;
if (*ptr == ',')
ptr++;
}
result = n;
return result;
}
static char *
ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
{
struct stat st;
int err;
err = stat("/proc/self/ns/net", &st);
if (err) {
p_err("Can't stat /proc/self: %s", strerror(errno));
return NULL;
}
if (st.st_dev != ns_dev || st.st_ino != ns_ino)
return NULL;
return if_indextoname(ifindex, buf);
}
static int read_sysfs_hex_int(char *path)
{
char vendor_id_buf[8];
int len;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
p_err("Can't open %s: %s", path, strerror(errno));
return -1;
}
len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
close(fd);
if (len < 0) {
p_err("Can't read %s: %s", path, strerror(errno));
return -1;
}
if (len >= (int)sizeof(vendor_id_buf)) {
p_err("Value in %s too long", path);
return -1;
}
vendor_id_buf[len] = 0;
return strtol(vendor_id_buf, NULL, 0);
}
static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
{
char full_path[64];
snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
devname, entry_name);
return read_sysfs_hex_int(full_path);
}
const char *
ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
const char **opt)
{
char devname[IF_NAMESIZE];
int vendor_id;
int device_id;
if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
p_err("Can't get net device name for ifindex %d: %s", ifindex,
strerror(errno));
return NULL;
}
vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
if (vendor_id < 0) {
p_err("Can't get device vendor id for %s", devname);
return NULL;
}
switch (vendor_id) {
case 0x19ee:
device_id = read_sysfs_netdev_hex_int(devname, "device");
if (device_id != 0x4000 &&
device_id != 0x6000 &&
device_id != 0x6003)
p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
*opt = "ctx4";
return "NFP-6xxx";
default:
p_err("Can't get bfd arch name for device vendor id 0x%04x",
vendor_id);
return NULL;
}
}
void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
char name[IF_NAMESIZE];
if (!ifindex)
return;
printf(" dev ");
if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
printf("%s", name);
else
printf("ifindex %u ns_dev %llu ns_ino %llu",
ifindex, ns_dev, ns_inode);
}
void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
char name[IF_NAMESIZE];
if (!ifindex)
return;
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;
}
