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