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/* ebt_stp
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* July, 2003
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include "../include/ebtables_u.h"
#include <linux/netfilter_bridge/ebt_stp.h>
#define STP_TYPE 'a'
#define STP_FLAGS 'b'
#define STP_ROOTPRIO 'c'
#define STP_ROOTADDR 'd'
#define STP_ROOTCOST 'e'
#define STP_SENDERPRIO 'f'
#define STP_SENDERADDR 'g'
#define STP_PORT 'h'
#define STP_MSGAGE 'i'
#define STP_MAXAGE 'j'
#define STP_HELLOTIME 'k'
#define STP_FWDD 'l'
#define STP_NUMOPS 12
static struct option opts[] =
{
{ "stp-type" , required_argument, 0, STP_TYPE},
{ "stp-flags" , required_argument, 0, STP_FLAGS},
{ "stp-root-prio" , required_argument, 0, STP_ROOTPRIO},
{ "stp-root-addr" , required_argument, 0, STP_ROOTADDR},
{ "stp-root-cost" , required_argument, 0, STP_ROOTCOST},
{ "stp-sender-prio" , required_argument, 0, STP_SENDERPRIO},
{ "stp-sender-addr" , required_argument, 0, STP_SENDERADDR},
{ "stp-port" , required_argument, 0, STP_PORT},
{ "stp-msg-age" , required_argument, 0, STP_MSGAGE},
{ "stp-max-age" , required_argument, 0, STP_MAXAGE},
{ "stp-hello-time" , required_argument, 0, STP_HELLOTIME},
{ "stp-forward-delay", required_argument, 0, STP_FWDD},
{ 0 }
};
#define BPDU_TYPE_CONFIG 0
#define BPDU_TYPE_TCN 0x80
#define BPDU_TYPE_CONFIG_STRING "config"
#define BPDU_TYPE_TCN_STRING "tcn"
#define FLAG_TC 0x01
#define FLAG_TC_ACK 0x80
#define FLAG_TC_STRING "topology-change"
#define FLAG_TC_ACK_STRING "topology-change-ack"
static void print_help()
{
printf(
"stp options:\n"
"--stp-type type : BPDU type\n"
"--stp-flags flag : control flag\n"
"--stp-root-prio prio[:prio] : root priority (16-bit) range\n"
"--stp-root-addr address[/mask] : MAC address of root\n"
"--stp-root-cost cost[:cost] : root cost (32-bit) range\n"
"--stp-sender-prio prio[:prio] : sender priority (16-bit) range\n"
"--stp-sender-addr address[/mask] : MAC address of sender\n"
"--stp-port port[:port] : port id (16-bit) range\n"
"--stp-msg-age age[:age] : message age timer (16-bit) range\n"
"--stp-max-age age[:age] : maximum age timer (16-bit) range\n"
"--stp-hello-time time[:time] : hello time timer (16-bit) range\n"
"--stp-forward-delay delay[:delay]: forward delay timer (16-bit) range\n"
" Recognized BPDU type strings:\n"
" \"config\": configuration BPDU (=0)\n"
" \"tcn\" : topology change notification BPDU (=0x80)\n"
" Recognized control flag strings:\n"
" \"topology-change\" : topology change flag (0x01)\n"
" \"topology-change-ack\": topology change acknowledgement flag (0x80)");
}
static void init(struct ebt_entry_match *match)
{
struct ebt_stp_info *stpinfo = (struct ebt_stp_info *)match->data;
stpinfo->invflags = 0;
stpinfo->bitmask = 0;
}
static int parse_range(const char *portstring, void *lower, void *upper,
int bits, uint32_t min, uint32_t max)
{
char *buffer;
char *cp, *end;
uint32_t low_nr, upp_nr;
int ret = 0;
buffer = strdup(portstring);
if ((cp = strchr(buffer, ':')) == NULL) {
low_nr = strtoul(buffer, &end, 10);
if (*end || low_nr < min || low_nr > max) {
ret = -1;
goto out;
}
if (bits == 2) {
*(uint16_t *)lower = low_nr;
*(uint16_t *)upper = low_nr;
} else {
*(uint32_t *)lower = low_nr;
*(uint32_t *)upper = low_nr;
}
} else {
*cp = '\0';
cp++;
if (!*buffer)
low_nr = min;
else {
low_nr = strtoul(buffer, &end, 10);
if (*end || low_nr < min) {
ret = -1;
goto out;
}
}
if (!*cp)
upp_nr = max;
else {
upp_nr = strtoul(cp, &end, 10);
if (*end || upp_nr > max) {
ret = -1;
goto out;
}
}
if (upp_nr < low_nr) {
ret = -1;
goto out;
}
if (bits == 2) {
*(uint16_t *)lower = low_nr;
*(uint16_t *)upper = upp_nr;
} else {
*(uint32_t *)lower = low_nr;
*(uint32_t *)upper = upp_nr;
}
}
out:
free(buffer);
return ret;
}
static void print_range(unsigned int l, unsigned int u)
{
if (l == u)
printf("%u ", l);
else
printf("%u:%u ", l, u);
}
static int parse(int c, char **argv, int argc, const struct ebt_u_entry *entry,
unsigned int *flags, struct ebt_entry_match **match)
{
struct ebt_stp_info *stpinfo = (struct ebt_stp_info *)(*match)->data;
unsigned int flag;
long int i;
char *end = NULL;
if (c < 'a' || c > ('a' + STP_NUMOPS - 1))
return 0;
flag = 1 << (c - 'a');
ebt_check_option2(flags, flag);
if (ebt_check_inverse2(optarg))
stpinfo->invflags |= flag;
stpinfo->bitmask |= flag;
switch (flag) {
case EBT_STP_TYPE:
i = strtol(optarg, &end, 0);
if (i < 0 || i > 255 || *end != '\0') {
if (!strcasecmp(optarg, BPDU_TYPE_CONFIG_STRING))
stpinfo->type = BPDU_TYPE_CONFIG;
else if (!strcasecmp(optarg, BPDU_TYPE_TCN_STRING))
stpinfo->type = BPDU_TYPE_TCN;
else
ebt_print_error2("Bad --stp-type argument");
} else
stpinfo->type = i;
break;
case EBT_STP_FLAGS:
i = strtol(optarg, &end, 0);
if (i < 0 || i > 255 || *end != '\0') {
if (!strcasecmp(optarg, FLAG_TC_STRING))
stpinfo->config.flags = FLAG_TC;
else if (!strcasecmp(optarg, FLAG_TC_ACK_STRING))
stpinfo->config.flags = FLAG_TC_ACK;
else
ebt_print_error2("Bad --stp-flags argument");
} else
stpinfo->config.flags = i;
break;
case EBT_STP_ROOTPRIO:
if (parse_range(argv[optind-1], &(stpinfo->config.root_priol),
&(stpinfo->config.root_priou), 2, 0, 0xffff))
ebt_print_error("Bad --stp-root-prio range");
break;
case EBT_STP_ROOTCOST:
if (parse_range(argv[optind-1], &(stpinfo->config.root_costl),
&(stpinfo->config.root_costu), 4, 0, 0xffffffff))
ebt_print_error("Bad --stp-root-cost range");
break;
case EBT_STP_SENDERPRIO:
if (parse_range(argv[optind-1], &(stpinfo->config.sender_priol),
&(stpinfo->config.sender_priou), 2, 0, 0xffff))
ebt_print_error("Bad --stp-sender-prio range");
break;
case EBT_STP_PORT:
if (parse_range(argv[optind-1], &(stpinfo->config.portl),
&(stpinfo->config.portu), 2, 0, 0xffff))
ebt_print_error("Bad --stp-port range");
break;
case EBT_STP_MSGAGE:
if (parse_range(argv[optind-1], &(stpinfo->config.msg_agel),
&(stpinfo->config.msg_ageu), 2, 0, 0xffff))
ebt_print_error("Bad --stp-msg-age range");
break;
case EBT_STP_MAXAGE:
if (parse_range(argv[optind-1], &(stpinfo->config.max_agel),
&(stpinfo->config.max_ageu), 2, 0, 0xffff))
ebt_print_error("Bad --stp-max-age range");
break;
case EBT_STP_HELLOTIME:
if (parse_range(argv[optind-1], &(stpinfo->config.hello_timel),
&(stpinfo->config.hello_timeu), 2, 0, 0xffff))
ebt_print_error("Bad --stp-hello-time range");
break;
case EBT_STP_FWDD:
if (parse_range(argv[optind-1], &(stpinfo->config.forward_delayl),
&(stpinfo->config.forward_delayu), 2, 0, 0xffff))
ebt_print_error("Bad --stp-forward-delay range");
break;
case EBT_STP_ROOTADDR:
if (ebt_get_mac_and_mask(argv[optind-1],
(unsigned char *)stpinfo->config.root_addr,
(unsigned char *)stpinfo->config.root_addrmsk))
ebt_print_error("Bad --stp-root-addr address");
break;
case EBT_STP_SENDERADDR:
if (ebt_get_mac_and_mask(argv[optind-1],
(unsigned char *)stpinfo->config.sender_addr,
(unsigned char *)stpinfo->config.sender_addrmsk))
ebt_print_error("Bad --stp-sender-addr address");
break;
default:
ebt_print_error("stp match: this shouldn't happen");
}
return 1;
}
static void final_check(const struct ebt_u_entry *entry,
const struct ebt_entry_match *match, const char *name,
unsigned int hookmask, unsigned int time)
{
uint8_t bridge_ula[6] = {0x01, 0x80, 0xc2, 0x00, 0x00, 0x00};
uint8_t msk[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
if (memcmp(entry->destmac, bridge_ula, 6) ||
memcmp(entry->destmsk, msk, 6))
ebt_print_error("STP matching is only valid when the "
"destination MAC address is the bridge group "
"address (BGA) 01:80:c2:00:00:00");
}
static void print(const struct ebt_u_entry *entry,
const struct ebt_entry_match *match)
{
struct ebt_stp_info *stpinfo = (struct ebt_stp_info *)match->data;
struct ebt_stp_config_info *c = &(stpinfo->config);
int i;
for (i = 0; i < STP_NUMOPS; i++) {
if (!(stpinfo->bitmask & (1 << i)))
continue;
printf("--%s %s", opts[i].name,
(stpinfo->invflags & (1 << i)) ? "! " : "");
if (EBT_STP_TYPE == (1 << i)) {
if (stpinfo->type == BPDU_TYPE_CONFIG)
printf("%s", BPDU_TYPE_CONFIG_STRING);
else if (stpinfo->type == BPDU_TYPE_TCN)
printf("%s", BPDU_TYPE_TCN_STRING);
else
printf("%d", stpinfo->type);
} else if (EBT_STP_FLAGS == (1 << i)) {
if (c->flags == FLAG_TC)
printf("%s", FLAG_TC_STRING);
else if (c->flags == FLAG_TC_ACK)
printf("%s", FLAG_TC_ACK_STRING);
else
printf("%d", c->flags);
} else if (EBT_STP_ROOTPRIO == (1 << i))
print_range(c->root_priol, c->root_priou);
else if (EBT_STP_ROOTADDR == (1 << i))
ebt_print_mac_and_mask((unsigned char *)c->root_addr,
(unsigned char*)c->root_addrmsk);
else if (EBT_STP_ROOTCOST == (1 << i))
print_range(c->root_costl, c->root_costu);
else if (EBT_STP_SENDERPRIO == (1 << i))
print_range(c->sender_priol, c->sender_priou);
else if (EBT_STP_SENDERADDR == (1 << i))
ebt_print_mac_and_mask((unsigned char *)c->sender_addr,
(unsigned char *)c->sender_addrmsk);
else if (EBT_STP_PORT == (1 << i))
print_range(c->portl, c->portu);
else if (EBT_STP_MSGAGE == (1 << i))
print_range(c->msg_agel, c->msg_ageu);
else if (EBT_STP_MAXAGE == (1 << i))
print_range(c->max_agel, c->max_ageu);
else if (EBT_STP_HELLOTIME == (1 << i))
print_range(c->hello_timel, c->hello_timeu);
else if (EBT_STP_FWDD == (1 << i))
print_range(c->forward_delayl, c->forward_delayu);
printf(" ");
}
}
static int compare(const struct ebt_entry_match *m1,
const struct ebt_entry_match *m2)
{
return (!memcmp(m1->data, m2->data, sizeof(struct ebt_stp_info)));
}
static struct ebt_u_match stp_match =
{
.name = "stp",
.size = sizeof(struct ebt_stp_info),
.help = print_help,
.init = init,
.parse = parse,
.final_check = final_check,
.print = print,
.compare = compare,
.extra_ops = opts,
};
void _init(void)
{
ebt_register_match(&stp_match);
}