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nf_tbf_ctl.c
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/*
* Copyright (C) 2013 Mikhail Vorozhtsov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include "nf_tbf.h"
#define DEFAULT_CONFIGFS_PATH "/sys/kernel/config"
#define ARRAY_SIZE(ARRAY) (sizeof (ARRAY) / sizeof ((ARRAY)[0]))
static const char *argv_0;
#define ERROR(MSG,...) \
fprintf (stderr, "%s: " MSG "\n", argv_0, ## __VA_ARGS__)
static const struct option options[] =
{
{ "configfs", 1, 0, 'c' },
{ "version", 0, 0, 'V' },
{ "help", 0, 0, 'H' },
{ 0, 0, 0, 0 }
};
static const struct option add_options[] =
{
{ "limit", 1, 0, 'l' },
{ "latency", 1, 0, 'L' },
{ "burst", 1, 0, 'b' },
{ "rate", 1, 0, 'r' },
{ 0, 0, 0, 0 }
};
static const struct option info_options[] =
{
{ "human-readable", 0, 0, 'h' },
{ "columns", 2, 0, 'c' },
{ 0, 0, 0, 0 }
};
static const struct option stats_options[] =
{
{ "human-readable", 0, 0, 'h' },
{ "columns", 2, 0, 'c' },
{ 0, 0, 0, 0 }
};
static void
usage ()
{
printf ("\
Usage: nf_tbf_ctl [OPTIONS] [COMMAND]\n\
Options:\n\
--configfs PATH\n\
Path to the configfs mount point (defaults to `%s').\n\
--version\n\
Print the program version and exit.\n\
--help\n\
Print this message and exit.\n\
Commands:\n\
list, ls - List buckets.\n\
add [OPTIONS] BUCKET - Add a new bucket.\n\
Options:\n\
-l, --limit BYTES\n\
Maximum queue size.\n\
-L, --latency MS\n\
Maximum amount of time a (high priority) packet can be held\n\
in the queue.\n\
-b, --burst BYTES\n\
Number of bytes that can be sent instantaneously.\n\
-r, --rate RATE\n\
Maximum speed.\n\
rm, del BUCKET - Remove the bucket.\n\
exists BUCKET - Test if the bucket exists\n\
configured BUCKET - Test if the bucket is configured\n\
info [OPTIONS] BUCKET - Print the bucket configuration\n\
Options:\n\
-h, --human-readable\n\
Print configuration in human readable format (default).\n\
-c, --columns[=SETTINGS]\n\
Print values of settings in SETTINGS separated by spaces.\n\
SETTINGS defaults to `limit,latency,burst,rate'.\n\
cfg [OPTIONS] BUCKET - Reconfigure the bucket\n\
Options:\n\
-l, --limit BYTES\n\
Maximum queue size.\n\
-L, --latency MS\n\
Maximum amount of time a (high priority) packet can be held\n\
in the queue.\n\
-b, --burst BYTES\n\
Number of bytes that can be sent instantaneously.\n\
-r, --rate RATE\n\
Maximum speed.\n\
stats [OPTIONS] BUCKET - Print the bucket counters\n\
Options:\n\
-h, --human-readable\n\
Print counters in human readable format (default).\n\
-c, --columns[=COUNTERS]\n\
Print values of counters in COUNTERS separated by spaces.\n\
COUNTERS defaults to `first_pkt_ts,pkts_bursted,bytes_bursted,\n\
pkts_queued,bytes_queued,pkts_dropped,bytes_dropped,\n\
pkts_nomem,bytes_nomem'.\n",
DEFAULT_CONFIGFS_PATH);
}
static void
version ()
{
printf ("nf_tbf_ctl %s\n", PACKAGE_VERSION);
}
static int
parse_uint32 (const char *str, uint32_t *result,
uint32_t min_value, uint32_t max_value,
const char **end)
{
uint32_t value = 0;
char c = *str;
if (c < '0' || c > '9')
return EINVAL;
do
{
uint32_t d = c - '0';
if (value > UINT32_MAX / 10
|| (value == UINT32_MAX / 10 && d > UINT32_MAX % 10))
return ERANGE;
value = value * 10 + d;
if (value > max_value)
return ERANGE;
++str;
c = *str;
}
while (c >= '0' && c <= '9');
if (value < min_value)
return ERANGE;
if (end)
*end = str;
else if (c)
return EINVAL;
*result = value;
return 0;
}
static int
parse_size (const char *str, uint32_t *result)
{
const char *end;
uint32_t value;
int r = parse_uint32(str, result, 0, UINT32_MAX, &end);
if (r)
return r;
if (!*end)
return 0;
value = *result;
if (!strcmp (end, "k"))
{
if (value > UINT32_MAX / 1000)
return ERANGE;
*result = value * 1000;
return 0;
}
if (!strcmp (end, "m"))
{
if (value > UINT32_MAX / 1000000)
return ERANGE;
*result = value * 1000000;
return 0;
}
if (!strcmp (end, "g"))
{
if (value > UINT32_MAX / 1000000000)
return ERANGE;
*result = value * 1000000000;
return 0;
}
if (!strcmp (end, "K"))
{
if (value > UINT32_MAX / 1024)
return ERANGE;
*result = value * 1024;
return 0;
}
if (!strcmp (end, "M"))
{
if (value > UINT32_MAX / (1024 * 1024))
return ERANGE;
*result = value * 1024 * 1024;
return 0;
}
if (!strcmp (end, "G"))
{
if (value > UINT32_MAX / (1024 * 1024 * 1024))
return ERANGE;
*result = value * 1024 * 1024 * 1024;
return 0;
}
return EINVAL;
}
static int
parse_uint64 (const char *str, uint64_t *result,
uint64_t min_value, uint64_t max_value,
const char **end)
{
uint64_t value = 0;
char c = *str;
if (c < '0' || c > '9')
return EINVAL;
do
{
uint64_t d = c - '0';
if (value > UINT64_MAX / 10
|| (value == UINT64_MAX / 10 && d > UINT64_MAX % 10))
return ERANGE;
value = value * 10 + d;
if (value > max_value)
return ERANGE;
++str;
c = *str;
}
while (c >= '0' && c <= '9');
if (value < min_value)
return ERANGE;
if (end)
*end = str;
else if (c)
return EINVAL;
*result = value;
return 0;
}
static int
parse_rate (const char *str, uint32_t *result)
{
const char *end;
uint64_t value;
int r = parse_uint64(str, &value, 0, UINT32_MAX * 8, &end);
if (r)
return r;
if (!*end || !strcmp (end, "b") || !strcmp (end, "bps"))
{
*result = value >> 3;
return 0;
}
if (!strcmp (end, "B") || !strcmp (end, "Bps"))
{
if (value > UINT32_MAX)
return ERANGE;
*result = value;
return 0;
}
if (!strcmp (end, "k") || !strcmp (end, "kb") || !strcmp (end, "kbps"))
{
if (value > (UINT32_MAX * 8) / 1000)
return ERANGE;
*result = (value * 1000) >> 3;
return 0;
}
if (!strcmp (end, "m") || !strcmp (end, "mb") || !strcmp (end, "mbps"))
{
if (value > (UINT32_MAX * 8) / 1000000)
return ERANGE;
*result = (value * 1000000) >> 3;
return 0;
}
if (!strcmp (end, "g") || !strcmp (end, "gb") || !strcmp (end, "gbps"))
{
if (value > (UINT32_MAX * 8) / 1000000000)
return ERANGE;
*result = (value * 1000000000) >> 3;
return 0;
}
if (!strcmp (end, "K") || !strcmp (end, "Kb") || !strcmp (end, "Kbps"))
{
if (value > (UINT32_MAX * 8) / 1024)
return ERANGE;
*result = (value * 1024) >> 3;
return 0;
}
if (!strcmp (end, "M") || !strcmp (end, "Mb") || !strcmp (end, "Mbps"))
{
if (value > (UINT32_MAX * 8) / (1024 * 1024))
return ERANGE;
*result = (value * 1024 * 1024) >> 3;
return 0;
}
if (!strcmp (end, "G") || !strcmp (end, "Gb") || !strcmp (end, "Gbps"))
{
if (value > (UINT32_MAX * 8) / (1024 * 1024 * 1024))
return ERANGE;
*result = (value * 1024 * 1024 * 1024) >> 3;
return 0;
}
if (!strcmp (end, "kB") || !strcmp (end, "kBps"))
{
if (value > UINT32_MAX / 1000)
return ERANGE;
*result = value * 1000;
return 0;
}
if (!strcmp (end, "mB") || !strcmp (end, "mBps"))
{
if (value > UINT32_MAX / 1000000)
return ERANGE;
*result = value * 1000000;
return 0;
}
if (!strcmp (end, "gB") || !strcmp (end, "gBps"))
{
if (value > UINT32_MAX / 1000000000)
return ERANGE;
*result = value * 1000000000;
return 0;
}
if (!strcmp (end, "KB") || !strcmp (end, "KBps"))
{
if (value > UINT32_MAX / 1024)
return ERANGE;
*result = value * 1024;
return 0;
}
if (!strcmp (end, "MB") || !strcmp (end, "MBps"))
{
if (value > UINT32_MAX / (1024 * 1024))
return ERANGE;
*result = value * 1024 * 1024;
return 0;
}
if (!strcmp (end, "GB") || !strcmp (end, "GBps"))
{
if (value > UINT32_MAX / (1024 * 1024 * 1024))
return ERANGE;
*result = value * 1024 * 1024 * 1024;
return 0;
}
return -1;
}
static void
print_size (char *str, size_t len, uint32_t i)
{
if (i == 1024)
{
snprintf (str, len, "1K");
return;
}
if (i == 1000)
{
snprintf (str, len, "1k");
return;
}
if (i < 1024)
{
snprintf (str, len, "%" PRIu32, i);
return;
}
if (i % 1000 == 0)
{
i /= 1000;
if (i % 1000 == 0)
{
i /= 1000;
if (i % 1000 == 0)
{
i /= 1000;
snprintf (str, len, "%" PRIu32 "g", i);
return;
}
snprintf (str, len, "%" PRIu32 "m", i);
return;
}
snprintf (str, len, "%" PRIu32 "k", i);
return;
}
if (i % 1024 == 0)
{
i /= 1024;
if (i % 1024 == 0)
{
i /= 1024;
if (i % 1024 == 0)
{
i /= 1024;
snprintf (str, len, "%" PRIu32 "G", i);
return;
}
snprintf (str, len, "%" PRIu32 "M", i);
return;
}
snprintf (str, len, "%" PRIu32 "K", i);
return;
}
snprintf (str, len, "%" PRIu32, i);
}
int
main (int argc, char * const argv[])
{
const char *configfs_path = DEFAULT_CONFIGFS_PATH;
const char *cmd;
char path[PATH_MAX];
DIR *dir;
uint16_t bucket_id;
int c;
argv_0 = argv[0];
while (1)
{
c = getopt_long (argc, argv, "+", options, NULL);
if (c == -1)
break;
switch (c)
{
case 'c':
configfs_path = optarg;
break;
case 'V':
version ();
return 0;
case 'H':
usage ();
return 0;
default:
return 1;
}
}
argc -= optind;
argv += optind;
optind = 1;
if (argc == 0)
{
ERROR ("A command expected.");
return 1;
}
#define OPEN_CONFIGFS_DIR \
do \
{ \
snprintf (path, sizeof (path), "%s/%s", configfs_path, PACKAGE_NAME); \
\
dir = opendir (path); \
\
if (!dir) \
{ \
if (errno == ENOENT) \
ERROR ( \
"Directory `%s' doesn't exist. Check that module `%s' is loaded " \
"and configfs is mounted at `%s'.", \
path, PACKAGE_NAME, configfs_path); \
else \
ERROR ("Failed to open directory `%s': %s.", \
path, strerror (errno)); \
\
return 2; \
} \
} \
while (0)
#define CHECK_CONFIGFS_DIR \
do \
{ \
OPEN_CONFIGFS_DIR; \
closedir (dir); \
} \
while (0)
#define PARSE_BUCKET_ID \
do \
{ \
uint32_t bucket_id_value; \
\
argv += optind; \
argc -= optind; \
\
if (argc == 0) \
{ \
ERROR ("A bucket id expected."); \
return 1; \
} \
\
if (parse_uint32 (argv[0], &bucket_id_value, 0, 0xFFFF, NULL)) \
{ \
ERROR ( \
"Invalid bucket id `%s', an integer between 0 and %u expected.", \
argv[0], 0xFFFF); \
return 1; \
} \
\
bucket_id = bucket_id_value; \
\
if (argc > 1) \
{ \
ERROR ("No arguments expected after bucket id."); \
return 1; \
} \
} \
while (0)
#define READ_ATTR(NAME,VALUE,RC_NOENT,RC_READ,RC_INVAL) \
do \
{ \
int fd; \
ssize_t nread; \
\
snprintf (path, sizeof (path), "%s/%s/%u/" NAME, \
configfs_path, PACKAGE_NAME, bucket_id); \
\
fd = open (path, O_RDONLY); \
\
if (fd < 0) \
{ \
if (errno == ENOENT) \
{ \
ERROR ("Bucket #%u doesn't exist.", bucket_id); \
return (RC_NOENT); \
} \
\
ERROR ("Failed to read attribute `" NAME "': %s.", \
strerror (errno)); \
return (RC_READ); \
} \
\
nread = read (fd, &(VALUE), sizeof (VALUE)); \
\
if (nread < 0) \
{ \
ERROR ("Failed to read attribute `" NAME "': %s.", \
strerror (errno)); \
return (RC_READ); \
} \
\
if (nread != sizeof (VALUE)) \
{ \
ERROR ("Failed to read attribute `" NAME "': %s.", \
strerror (errno)); \
return (RC_INVAL); \
} \
\
close (fd); \
} \
while (0)
#define WRITE_ATTR(NAME,VALUE,RC_NOENT,RC_WRITE) \
do \
{ \
int fd; \
\
snprintf (path, sizeof (path), "%s/%s/%u/" NAME, \
configfs_path, PACKAGE_NAME, bucket_id); \
\
fd = open (path, O_WRONLY); \
\
if (fd < 0) \
{ \
if (errno == ENOENT) \
{ \
ERROR ("Bucket #%u doesn't exist.", bucket_id); \
return (RC_NOENT); \
} \
\
ERROR ("Failed to write attribute `" NAME "': %s.", \
strerror (errno)); \
return (RC_WRITE); \
} \
\
if (write (fd, &(VALUE), sizeof (VALUE)) != sizeof (VALUE)) \
{ \
ERROR ("Failed to write attribute `" NAME "': %s.", \
strerror (errno)); \
return (RC_WRITE); \
} \
\
close (fd); \
} \
while (0)
cmd = argv[0];
if (!strcmp (cmd, "list") || !strcmp (cmd, "ls"))
{
if (argc > 1)
{
ERROR ("No agruments expected for command `%s'.", cmd);
return 1;
}
OPEN_CONFIGFS_DIR;
while (1)
{
struct dirent *e;
errno = 0;
e = readdir (dir);
if (e == NULL)
{
if (errno != 0)
{
ERROR ("Failed to read pool list: %s.", strerror (errno));
return 3;
}
return 0;
}
if (e->d_name[0] >= '0' && e->d_name[0] <= '9')
printf ("%s\n", e->d_name);
}
}
else if (!strcmp (cmd, "add") || !strcmp (cmd, "cfg"))
{
struct nf_tbf_cfg cfg;
uint32_t latency = 0;
int r;
memset (&cfg, 0, sizeof (cfg));
((const char **) argv)[0] = argv_0;
while (1)
{
c = getopt_long (argc, argv, "+l:L:b:r:", add_options, NULL);
if (c == -1)
break;
switch (c)
{
case 'l':
r = parse_size (optarg, &cfg.limit);
if (r == ERANGE)
{
ERROR ("Limit `%s' is out of bounds.", optarg);
return 1;
}
if (r)
{
ERROR ("Invalid limit `%s'.", optarg);
return 1;
}
if (cfg.limit == 0)
{
ERROR ("Limit must be positive.");
return 1;
}
if (latency)
latency = 0;
break;
case 'L':
if (parse_uint32 (optarg, &latency, 0, 1000, NULL))
{
ERROR ("\
Invalid latency `%s', an integer between 0 and 1000 expected.",
optarg);
return 1;
}
if (cfg.limit)
cfg.limit = 0;
break;
case 'b':
r = parse_size (optarg, &cfg.burst);
if (r == ERANGE)
{
ERROR ("Burst `%s' is out of bounds.", optarg);
return 1;
}
if (r)
{
ERROR ("Invalid burst `%s'.", optarg);
return 1;
}
if (cfg.burst < NF_TBF_MIN_BURST)
{
ERROR ("Burst must be greater or equal to %u.",
NF_TBF_MIN_BURST);
return 1;
}
break;
case 'r':
r = parse_rate (optarg, &cfg.rate);
if (r == ERANGE)
{
ERROR ("Rate `%s' is out of bounds.", optarg);
return 1;
}
if (r)
{
ERROR ("Invalid rate `%s'.", optarg);
return 1;
}
if (cfg.rate < NF_TBF_MIN_RATE)
{
ERROR ("Rate must be greater or equal to %uBps",
NF_TBF_MIN_RATE);
return 1;
}
break;
default:
return 1;
}
}
if (cfg.burst == 0)
{
ERROR ("Burst was not specified.");
return 1;
}
if (cfg.rate == 0)
{
ERROR ("Rate was not specified.");
return 1;
}
if (cfg.limit == 0)
{
if (latency == 0)
{
ERROR ("Neither limit nor latency were specified.");
return 1;
}
cfg.limit = ((uint64_t) latency * cfg.rate) / 1000;
if (cfg.limit > UINT32_MAX - cfg.burst)
{
ERROR ("Latency is too high for the given rate and burst.");
return 1;
}
cfg.limit += cfg.burst;
}
else if (cfg.limit < cfg.burst)
{
ERROR ("Limit must be greater or equal to burst.");
return 1;
}
PARSE_BUCKET_ID;
CHECK_CONFIGFS_DIR;
if (!strcmp (cmd, "add"))
{
snprintf (path, sizeof (path), "%s/%s/%u",
configfs_path, PACKAGE_NAME, bucket_id);
if (mkdir (path, 00771) < 0)
{
if (errno == EEXIST)
{
ERROR ("Bucket #%u already exists.", bucket_id);
return 3;
}
else
{
ERROR ("Failed to create directory `%s': %s.",
path, strerror (errno));
return 4;
}
}
}
WRITE_ATTR("cfg", cfg, 5, 5);
}
else if (!strcmp (cmd, "rm") || !strcmp (cmd, "del"))
{
PARSE_BUCKET_ID;
CHECK_CONFIGFS_DIR;
snprintf (path, sizeof (path), "%s/%s/%u",
configfs_path, PACKAGE_NAME, bucket_id);
if (rmdir (path) < 0)
{
if (errno == ENOENT)
{
ERROR ("Bucket #%u doesn't exist.", bucket_id);
return 3;
}
ERROR ("Failed to remove directory `%s': %s.",
path, strerror (errno));
return 4;
}
}
else if (!strcmp (cmd, "exists"))
{
struct stat stat_buf;
PARSE_BUCKET_ID;
CHECK_CONFIGFS_DIR;
snprintf (path, sizeof (path), "%s/%s/%u",
configfs_path, PACKAGE_NAME, bucket_id);
if (stat (path, &stat_buf) < 0)
{
if (errno == ENOENT)
return 3;
ERROR ("Failed to open directory `%s': %s.",
path, strerror (errno));
return 4;
}
if (!S_ISDIR (stat_buf.st_mode))
{
ERROR ("Failed to open directory `%s': %s",
path, strerror (ENOTDIR));
return 4;
}
}
else if (!strcmp (cmd, "configured"))
{
struct nf_tbf_cfg cfg;
PARSE_BUCKET_ID;
CHECK_CONFIGFS_DIR;
READ_ATTR("cfg", cfg, 3, 4, 4);
if (cfg.burst == 0)
return 5;
}
else if (!strcmp (cmd, "info"))
{
enum column
{
COLUMN_NONE = 0,
COLUMN_LIMIT = 1,
COLUMN_LATENCY = 2,
COLUMN_BURST = 4,
COLUMN_RATE = 8,
COLUMN_ALL = COLUMN_LIMIT | COLUMN_LATENCY | COLUMN_BURST
| COLUMN_RATE
};
int human_readable_p = 1;
enum column columns = COLUMN_ALL;
enum column column_list[] = {
COLUMN_LIMIT, COLUMN_LATENCY, COLUMN_BURST, COLUMN_RATE
};
struct nf_tbf_cfg cfg;
uint64_t latency = 0, rem;
((const char **) argv)[0] = argv_0;
while (1)
{
c = getopt_long (argc, argv, "+hc::", info_options, NULL);
if (c == -1)
break;
switch (c)
{
case 'h':
human_readable_p = 1;
columns = COLUMN_ALL;
column_list[0] = COLUMN_LIMIT;
column_list[1] = COLUMN_LATENCY;
column_list[2] = COLUMN_BURST;
column_list[3] = COLUMN_RATE;
break;
case 'c':
if (optarg == NULL)
{
columns = COLUMN_ALL;
column_list[0] = COLUMN_LIMIT;
column_list[1] = COLUMN_LATENCY;
column_list[2] = COLUMN_BURST;
column_list[3] = COLUMN_RATE;
}
else
{
unsigned int i;
const char *s = optarg;
if (!*s)
{
ERROR ("Empty settings list.");
return 1;
}
columns = COLUMN_NONE;
column_list[0] = COLUMN_NONE;
column_list[1] = COLUMN_NONE;
column_list[2] = COLUMN_NONE;
column_list[3] = COLUMN_NONE;
for (i = 0; i < ARRAY_SIZE (column_list); ++ i)
{
#define CHECK_TOKEN(TOKEN,COLUMN) \
if (!strncmp (s, (TOKEN), strlen (TOKEN)) == 0) \
{ \
s += strlen (TOKEN); \
\
if (*s && *s != ',') \
break; \
\
if (columns & (COLUMN)) \
{ \
ERROR ("Token `" TOKEN "' is duplicated."); \
return 1; \
} \
\
columns |= COLUMN; \
column_list[i] = COLUMN; \
\
if (!*s) \
break; \
\
continue; \
}
CHECK_TOKEN ("limit", COLUMN_LIMIT);
CHECK_TOKEN ("latency", COLUMN_LATENCY);
CHECK_TOKEN ("burst", COLUMN_BURST);
CHECK_TOKEN ("rate", COLUMN_RATE);
#undef CHECK_TOKEN
break;
}
if (*s)
{
ERROR ("Invalid settings list `%s'.", optarg);
return 1;
}
}
human_readable_p = 0;
break;
default:
return 1;
}
}