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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 <netinet/ether.h>
#include <linux/netfilter_bridge/ebt_stp.h>
#include <xtables.h>
#include "iptables/nft.h"
#include "iptables/nft-bridge.h"
/* These must correspond to the bit position in EBT_STP_* defines */
enum {
O_TYPE = 0,
O_FLAGS,
O_RPRIO,
O_RADDR,
O_RCOST,
O_SPRIO,
O_SADDR,
O_PORT,
O_MSGAGE,
O_MAXAGE,
O_HTIME,
O_FWDD,
};
static const struct xt_option_entry brstp_opts[] = {
#define ENTRY(n, i, t) { .name = n, .id = i, .type = t, .flags = XTOPT_INVERT }
ENTRY("stp-type", O_TYPE, XTTYPE_STRING),
ENTRY("stp-flags", O_FLAGS, XTTYPE_STRING),
ENTRY("stp-root-prio", O_RPRIO, XTTYPE_UINT16RC),
ENTRY("stp-root-addr", O_RADDR, XTTYPE_ETHERMACMASK),
ENTRY("stp-root-cost", O_RCOST, XTTYPE_UINT32RC),
ENTRY("stp-sender-prio", O_SPRIO, XTTYPE_UINT16RC),
ENTRY("stp-sender-addr", O_SADDR, XTTYPE_ETHERMACMASK),
ENTRY("stp-port", O_PORT, XTTYPE_UINT16RC),
ENTRY("stp-msg-age", O_MSGAGE, XTTYPE_UINT16RC),
ENTRY("stp-max-age", O_MAXAGE, XTTYPE_UINT16RC),
ENTRY("stp-hello-time", O_HTIME, XTTYPE_UINT16RC),
ENTRY("stp-forward-delay", O_FWDD, XTTYPE_UINT16RC),
XTOPT_TABLEEND,
};
#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 brstp_print_help(void)
{
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 print_range(unsigned int l, unsigned int u)
{
if (l == u)
printf("%u", l);
else
printf("%u:%u", l, u);
}
static void brstp_parse(struct xt_option_call *cb)
{
struct ebt_stp_info *stpinfo = cb->data;
char *end = NULL;
long int i;
xtables_option_parse(cb);
stpinfo->bitmask |= 1 << cb->entry->id;
if (cb->invert)
stpinfo->invflags |= 1 << cb->entry->id;
switch (cb->entry->id) {
case O_TYPE:
i = strtol(cb->arg, &end, 0);
if (i < 0 || i > 255 || *end != '\0') {
if (!strcasecmp(cb->arg, BPDU_TYPE_CONFIG_STRING))
stpinfo->type = BPDU_TYPE_CONFIG;
else if (!strcasecmp(cb->arg, BPDU_TYPE_TCN_STRING))
stpinfo->type = BPDU_TYPE_TCN;
else
xtables_error(PARAMETER_PROBLEM, "Bad --stp-type argument");
} else
stpinfo->type = i;
break;
case O_FLAGS:
i = strtol(cb->arg, &end, 0);
if (i < 0 || i > 255 || *end != '\0') {
if (!strcasecmp(cb->arg, FLAG_TC_STRING))
stpinfo->config.flags = FLAG_TC;
else if (!strcasecmp(cb->arg, FLAG_TC_ACK_STRING))
stpinfo->config.flags = FLAG_TC_ACK;
else
xtables_error(PARAMETER_PROBLEM, "Bad --stp-flags argument");
} else
stpinfo->config.flags = i;
break;
case O_RADDR:
memcpy(stpinfo->config.root_addr, cb->val.ethermac, ETH_ALEN);
memcpy(stpinfo->config.root_addrmsk,
cb->val.ethermacmask, ETH_ALEN);
break;
case O_SADDR:
memcpy(stpinfo->config.sender_addr, cb->val.ethermac, ETH_ALEN);
memcpy(stpinfo->config.sender_addrmsk,
cb->val.ethermacmask, ETH_ALEN);
break;
#define RANGE_ASSIGN(fname, val) { \
stpinfo->config.fname##l = val[0]; \
stpinfo->config.fname##u = cb->nvals > 1 ? val[1] : val[0]; \
}
case O_RPRIO:
RANGE_ASSIGN(root_prio, cb->val.u16_range);
break;
case O_RCOST:
RANGE_ASSIGN(root_cost, cb->val.u32_range);
break;
case O_SPRIO:
RANGE_ASSIGN(sender_prio, cb->val.u16_range);
break;
case O_PORT:
RANGE_ASSIGN(port, cb->val.u16_range);
break;
case O_MSGAGE:
RANGE_ASSIGN(msg_age, cb->val.u16_range);
break;
case O_MAXAGE:
RANGE_ASSIGN(max_age, cb->val.u16_range);
break;
case O_HTIME:
RANGE_ASSIGN(hello_time, cb->val.u16_range);
break;
case O_FWDD:
RANGE_ASSIGN(forward_delay, cb->val.u16_range);
break;
#undef RANGE_ASSIGN
}
}
static void brstp_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ebt_stp_info *stpinfo = (struct ebt_stp_info *)match->data;
const struct ebt_stp_config_info *c = &(stpinfo->config);
int i;
for (i = 0; (1 << i) < EBT_STP_MASK; i++) {
if (!(stpinfo->bitmask & (1 << i)))
continue;
printf("%s--%s ",
(stpinfo->invflags & (1 << i)) ? "! " : "",
brstp_opts[i].name);
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))
xtables_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))
xtables_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 struct xtables_match brstp_match = {
.name = "stp",
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = sizeof(struct ebt_stp_info),
.help = brstp_print_help,
.x6_parse = brstp_parse,
.print = brstp_print,
.x6_options = brstp_opts
};
void _init(void)
{
xtables_register_match(&brstp_match);
}
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