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#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_vlan.h>
#include <string.h>
#include <limits.h>
#include "busybox.h"
#define VLAN_GROUP_ARRAY_LEN 4096
#define SIOCSIFVLAN 0x8983 /* Set 802.1Q VLAN options */
/* This is rather specialized in that we're passing a 'char **' in
* order to avoid the pointer dereference multiple times in the
* actual calls below. */
static unsigned long xstrtoul10(char **str, unsigned long max_val)
{
char *endptr;
unsigned long r;
r = strtoul(str[2], &endptr, 10);
if ((r > max_val) || (*endptr != 0)) {
show_usage();
}
return r;
}
/* On entry, table points to the length of the current string plus
* nul terminator plus data lenght for the subsequent entry. The
* return value is the last data entry for the matching string. */
static const char *xfind_str(const char *table, const char *str)
{
while (strcasecmp(str, table+1) != 0) {
if (!*(table += table[0])) {
show_usage();
}
}
return table - 1;
}
static const char cmds[] = {
4, ADD_VLAN_CMD, 7,
'a', 'd', 'd', 0,
3, DEL_VLAN_CMD, 7,
'r', 'e', 'm', 0,
3, SET_VLAN_NAME_TYPE_CMD, 17,
's', 'e', 't', '_',
'n', 'a', 'm', 'e', '_',
't', 'y', 'p', 'e', 0,
4, SET_VLAN_FLAG_CMD, 12,
's', 'e', 't', '_',
'f', 'l', 'a', 'g', 0,
5, SET_VLAN_EGRESS_PRIORITY_CMD, 18,
's', 'e', 't', '_',
'e', 'g', 'r', 'e', 's', 's', '_',
'm', 'a', 'p', 0,
5, SET_VLAN_INGRESS_PRIORITY_CMD, 16,
's', 'e', 't', '_',
'i', 'n', 'g', 'r', 'e', 's', 's', '_',
'm', 'a', 'p', 0,
};
static const char name_types[] = {
VLAN_NAME_TYPE_PLUS_VID, 16,
'V', 'L', 'A', 'N',
'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
0,
VLAN_NAME_TYPE_PLUS_VID_NO_PAD, 22,
'V', 'L', 'A', 'N',
'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
'_', 'N', 'O', '_', 'P', 'A', 'D', 0,
VLAN_NAME_TYPE_RAW_PLUS_VID, 15,
'D', 'E', 'V',
'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
0,
VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, 20,
'D', 'E', 'V',
'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
'_', 'N', 'O', '_', 'P', 'A', 'D', 0,
};
static const char conf_file_name[] = "/proc/net/vlan/config";
int vconfig_main(int argc, char **argv)
{
struct vlan_ioctl_args ifr;
const char *p;
int fd;
if (argc < 3) {
show_usage();
}
/* Don't bother closing the filedes. It will be closed on cleanup. */
if (open(conf_file_name, O_RDONLY) < 0) { /* Is 802.1q is present? */
perror_msg_and_die("open %s", conf_file_name);
}
memset(&ifr, 0, sizeof(struct vlan_ioctl_args));
++argv;
p = xfind_str(cmds+2, *argv);
ifr.cmd = *p;
if (argc != p[-1]) {
show_usage();
}
if (ifr.cmd == SET_VLAN_NAME_TYPE_CMD) { /* set_name_type */
ifr.u.name_type = *xfind_str(name_types+1, argv[1]);
} else {
if (strlen(argv[1]) >= IF_NAMESIZE) {
error_msg_and_die("if_name >= %d chars\n", IF_NAMESIZE);
}
strcpy(ifr.device1, argv[1]);
/* I suppose one could try to combine some of the function calls below,
* since ifr.u.flag, ifr.u.VID, and ifr.u.skb_priority are all same-sized
* (unsigned) int members of a unions. But because of the range checking,
* doing so wouldn't save that much space and would also make maintainence
* more of a pain. */
if (ifr.cmd == SET_VLAN_FLAG_CMD) { /* set_flag */
ifr.u.flag = xstrtoul10(argv, 1);
} else if (ifr.cmd == ADD_VLAN_CMD) { /* add */
ifr.u.VID = xstrtoul10(argv, VLAN_GROUP_ARRAY_LEN-1);
} else if (ifr.cmd != DEL_VLAN_CMD) { /* set_{egress|ingress}_map */
ifr.u.skb_priority = xstrtoul10(argv, ULONG_MAX);
ifr.vlan_qos = xstrtoul10(argv+1, 7);
}
}
if (((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
|| (ioctl(fd, SIOCSIFVLAN, &ifr) < 0)
) {
perror_msg_and_die("socket or ioctl error for %s", *argv);
}
return 0;
}
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