utilities/ovs-vlan-bug-workaround.c

   1 /*
   2  * Copyright (c) 2011 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include <errno.h>
  20 #include <getopt.h>
  21 #include <linux/if_vlan.h>
  22 #include <linux/sockios.h>
  23 #include <net/if.h>
  24 #include <stdlib.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/socket.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include "command-line.h"
  32 #include "util.h"
  33
  34 #define ADD_ALL_VLANS_CMD 10
  35 #define DEL_ALL_VLANS_CMD 11
  36
  37 static void usage(void);
  38 static void parse_options(int argc, char *argv[]);
  39
  40 int
  41 main(int argc, char *argv[])
  42 {
  43     struct vlan_ioctl_args vlan_args;
  44     const char *netdev, *setting;
  45     int fd;
  46
  47     set_program_name(argv[0]);
  48
  49     parse_options(argc, argv);
  50     if (argc - optind != 2) {
  51         ovs_fatal(0, "exactly two non-option arguments are required "
  52                   "(use --help for help)");
  53     }
  54
  55     memset(&vlan_args, 0, sizeof vlan_args);
  56
  57     /* Get command. */
  58     setting = argv[optind + 1];
  59     if (!strcmp(setting, "on")) {
  60         vlan_args.cmd = ADD_ALL_VLANS_CMD;
  61     } else if (!strcmp(setting, "off")) {
  62         vlan_args.cmd = DEL_ALL_VLANS_CMD;
  63     } else {
  64         ovs_fatal(0, "second command line argument must be \"on\" or \"off\" "
  65                   "(not \"%s\")", setting);
  66     }
  67
  68     /* Get network device name. */
  69     netdev = argv[optind];
  70     if (strlen(netdev) >= IFNAMSIZ) {
  71         ovs_fatal(0, "%s: network device name too long", netdev);
  72     }
  73     strcpy(vlan_args.device1, netdev);
  74
  75     /* Execute operation. */
  76     fd = socket(AF_INET, SOCK_STREAM, 0);
  77     if (fd < 0) {
  78         ovs_fatal(errno, "socket creation failed");
  79     }
  80     if (ioctl(fd, SIOCSIFVLAN, &vlan_args) < 0) {
  81         if (errno == ENOPKG) {
  82             ovs_fatal(0, "operation failed (8021q module not loaded)");
  83         } else if (errno == EOPNOTSUPP) {
  84             ovs_fatal(0, "operation failed (kernel does not support the "
  85                       "VLAN bug workaround)");
  86         } else {
  87             ovs_fatal(errno, "operation failed");
  88         }
  89     }
  90     close(fd);
  91
  92     return 0;
  93 }
  94
  95 static void
  96 usage(void)
  97 {
  98     printf("\
  99 %s, for enabling or disabling the kernel VLAN bug workaround\n\
 100 usage: %s NETDEV SETTING\n\
 101 where NETDEV is a network device (e.g. \"eth0\")\n\
 102   and SETTING is \"on\" to enable the workaround or \"off\" to disable it.\n\
 103 \n\
 104 Options:\n\
 105   -h, --help         Print this helpful information\n\
 106   -V, --version      Display version information\n",
 107            program_name, program_name);
 108     exit(EXIT_SUCCESS);
 109 }
 110
 111 static void
 112 parse_options(int argc, char *argv[])
 113 {
 114     static const struct option long_options[] = {
 115         {"help", no_argument, NULL, 'h'},
 116         {"version", no_argument, NULL, 'V'},
 117         {NULL, 0, NULL, 0},
 118     };
 119     char *short_options = long_options_to_short_options(long_options);
 120
 121     for (;;) {
 122         int option;
 123
 124         option = getopt_long(argc, argv, "+t:hVe", long_options, NULL);
 125         if (option == -1) {
 126             break;
 127         }
 128         switch (option) {
 129         case 'h':
 130             usage();
 131             break;
 132
 133         case 'V':
 134             ovs_print_version(0, 0);
 135             exit(EXIT_SUCCESS);
 136
 137         case '?':
 138             exit(EXIT_FAILURE);
 139
 140         default:
 141             OVS_NOT_REACHED();
 142         }
 143     }
 144     free(short_options);
 145 }