Rewrite by Manuel Novoa III, very compact implimentation.
This commit is contained in:
Glenn L McGrath
parent
cb665093b8
commit
b4f3d7f594
@ -1,166 +1,140 @@
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <strings.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 <linux/sockios.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.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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int vconfig_main(int argc, char** argv) {
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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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struct vlan_ioctl_args if_request;
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char* cmd = NULL;
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char* if_name = NULL;
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unsigned int vid = 0;
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unsigned int skb_priority;
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unsigned short vlan_qos;
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unsigned int nm_type = VLAN_NAME_TYPE_PLUS_VID;
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char* conf_file_name = "/proc/net/vlan/config";
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memset(&if_request, 0, sizeof(struct vlan_ioctl_args));
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if ((argc < 3) || (argc > 5)) {
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error_msg_and_die("Expecting argc to be 3-5, inclusive. Was: %d\n",argc);
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}
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else {
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cmd = argv[1];
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if (strcasecmp(cmd, "set_name_type") == 0) {
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if (strcasecmp(argv[2], "VLAN_PLUS_VID") == 0) {
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nm_type = VLAN_NAME_TYPE_PLUS_VID;
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}
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else if (strcasecmp(argv[2], "VLAN_PLUS_VID_NO_PAD") == 0) {
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nm_type = VLAN_NAME_TYPE_PLUS_VID_NO_PAD;
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}
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else if (strcasecmp(argv[2], "DEV_PLUS_VID") == 0) {
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nm_type = VLAN_NAME_TYPE_RAW_PLUS_VID;
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}
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else if (strcasecmp(argv[2], "DEV_PLUS_VID_NO_PAD") == 0) {
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nm_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
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}
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else {
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error_msg_and_die("Invalid name type.\n");
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}
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if_request.u.name_type = nm_type;
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}
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else {
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if_name = argv[2];
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if (strlen(if_name) > 15) {
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error_msg_and_die("ERROR: if_name must be 15 characters or less.\n");
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}
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strcpy(if_request.device1, if_name);
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if (argc < 3) {
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show_usage();
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}
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if (argc == 4) {
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vid = atoi(argv[3]);
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if_request.u.VID = vid;
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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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if (argc == 5) {
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skb_priority = atoi(argv[3]);
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vlan_qos = atoi(argv[4]);
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if_request.u.skb_priority = skb_priority;
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if_request.vlan_qos = vlan_qos;
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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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// Open up the /proc/vlan/config
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if ((fd = open(conf_file_name, O_RDONLY)) < 0) {
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error_msg("WARNING: Could not open /proc/net/vlan/config. Maybe you need to load the 8021q module, or maybe you are not using PROCFS??\n");
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}
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else {
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close(fd);
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}
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/* We use sockets now, instead of the file descriptor */
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if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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error_msg_and_die("FATAL: Couldn't open a socket..go figure!\n");
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}
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/* add */
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if (strcasecmp(cmd, "add") == 0) {
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if_request.cmd = ADD_VLAN_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to add VLAN #%u to IF -:%s:- error: %s\n",
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vid, if_name, strerror(errno));
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}
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else {
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printf("Added VLAN with VID == %u to IF -:%s:-\n", vid, if_name);
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if (vid == 1) {
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error_msg("WARNING: VLAN 1 does not work with many switches,\nconsider another number if you have problems.\n");
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}
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}
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}//if
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else if (strcasecmp(cmd, "rem") == 0) {
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if_request.cmd = DEL_VLAN_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to remove VLAN -:%s:- error: %s\n",
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if_name, strerror(errno));
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}
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else {
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printf("Removed VLAN -:%s:-\n", if_name);
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}
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}//if
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else if (strcasecmp(cmd, "set_egress_map") == 0) {
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if_request.cmd = SET_VLAN_EGRESS_PRIORITY_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to set egress map on device -:%s:- error: %s\n",
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if_name, strerror(errno));
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}
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else {
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printf("Set egress mapping on device -:%s:- "
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"Should be visible in /proc/net/vlan/%s\n",
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if_name, if_name);
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}
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}
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else if (strcasecmp(cmd, "set_ingress_map") == 0) {
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if_request.cmd = SET_VLAN_INGRESS_PRIORITY_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to set ingress map on device -:%s:- error: %s\n",
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if_name, strerror(errno));
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}
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else {
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printf("Set ingress mapping on device -:%s:- "
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"Should be visible in /proc/net/vlan/%s\n",
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if_name, if_name);
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}
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}
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else if (strcasecmp(cmd, "set_flag") == 0) {
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if_request.cmd = SET_VLAN_FLAG_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to set flag on device -:%s:- error: %s\n",
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if_name, strerror(errno));
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}
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else {
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printf("Set flag on device -:%s:- "
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"Should be visible in /proc/net/vlan/%s\n",
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if_name, if_name);
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}
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}
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else if (strcasecmp(cmd, "set_name_type") == 0) {
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if_request.cmd = SET_VLAN_NAME_TYPE_CMD;
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if (ioctl(fd, SIOCSIFVLAN, &if_request) < 0) {
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error_msg("ERROR: trying to set name type for VLAN subsystem, error: %s\n",
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strerror(errno));
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}
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else {
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printf("Set name-type for VLAN subsystem."
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" Should be visible in /proc/net/vlan/config\n");
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}
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}
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else {
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error_msg_and_die("Unknown command -:%s:-\n", cmd);
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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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}/* main */
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}
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