usr/src/cmd/cmd-inet/usr.sbin/if_mpadm.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <errno.h>
  27 #include <ipmp_admin.h>
  28 #include <libinetutil.h>
  29 #include <locale.h>
  30 #include <net/if.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36 #include <sys/socket.h>
  37 #include <sys/sockio.h>
  38 #include <sys/types.h>
  39
  40 typedef void            offline_func_t(const char *, ipmp_handle_t);
  41
  42 static const char       *progname;
  43 static int              sioc4fd, sioc6fd;
  44 static offline_func_t   do_offline, undo_offline;
  45 static boolean_t        set_lifflags(const char *, uint64_t);
  46 static boolean_t        is_offline(const char *);
  47 static void             warn(const char *, ...);
  48 static void             die(const char *, ...);
  49
  50 static void
  51 usage(void)
  52 {
  53         (void) fprintf(stderr, gettext("Usage: %s -d | -r <ifname>\n"),
  54             progname);
  55         exit(EXIT_FAILURE);
  56 }
  57
  58 static const char *
  59 mpadm_errmsg(uint32_t error)
  60 {
  61         switch (error) {
  62         case IPMP_EUNKIF:
  63                 return (gettext("not a physical interface or not in an "
  64                     "IPMP group"));
  65         case IPMP_EMINRED:
  66                 return (gettext("no other functioning interfaces are in its "
  67                     "IPMP group"));
  68         default:
  69                 return (ipmp_errmsg(error));
  70         }
  71 }
  72
  73 int
  74 main(int argc, char **argv)
  75 {
  76         int retval;
  77         ipmp_handle_t handle;
  78         offline_func_t *ofuncp = NULL;
  79         const char *ifname;
  80         int c;
  81
  82         if ((progname = strrchr(argv[0], '/')) != NULL)
  83                 progname++;
  84         else
  85                 progname = argv[0];
  86
  87         (void) setlocale(LC_ALL, "");
  88         (void) textdomain(TEXT_DOMAIN);
  89
  90         while ((c = getopt(argc, argv, "d:r:")) != EOF) {
  91                 switch (c) {
  92                 case 'd':
  93                         ifname = optarg;
  94                         ofuncp = do_offline;
  95                         break;
  96                 case 'r':
  97                         ifname = optarg;
  98                         ofuncp = undo_offline;
  99                         break;
 100                 default:
 101                         usage();
 102                 }
 103         }
 104
 105         if (ofuncp == NULL)
 106                 usage();
 107
 108         /*
 109          * Create the global V4 and V6 socket ioctl descriptors.
 110          */
 111         sioc4fd = socket(AF_INET, SOCK_DGRAM, 0);
 112         sioc6fd = socket(AF_INET6, SOCK_DGRAM, 0);
 113         if (sioc4fd == -1 || sioc6fd == -1)
 114                 die("cannot create sockets");
 115
 116         if ((retval = ipmp_open(&handle)) != IPMP_SUCCESS)
 117                 die("cannot create ipmp handle: %s\n", ipmp_errmsg(retval));
 118
 119         (*ofuncp)(ifname, handle);
 120
 121         ipmp_close(handle);
 122         (void) close(sioc4fd);
 123         (void) close(sioc6fd);
 124
 125         return (EXIT_SUCCESS);
 126 }
 127
 128 /*
 129  * Checks whether IFF_OFFLINE is set on `ifname'.
 130  */
 131 boolean_t
 132 is_offline(const char *ifname)
 133 {
 134         struct lifreq lifr = { 0 };
 135
 136         (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
 137         if (ioctl(sioc4fd, SIOCGLIFFLAGS, &lifr) == -1) {
 138                 if (errno != ENXIO ||
 139                     ioctl(sioc6fd, SIOCGLIFFLAGS, &lifr) == -1) {
 140                         die("cannot get interface flags on %s", ifname);
 141                 }
 142         }
 143
 144         return ((lifr.lifr_flags & IFF_OFFLINE) != 0);
 145 }
 146
 147 static void
 148 do_offline(const char *ifname, ipmp_handle_t handle)
 149 {
 150         ifaddrlistx_t *ifaddrp, *ifaddrs;
 151         int retval;
 152
 153         if (is_offline(ifname))
 154                 die("interface %s is already offline\n", ifname);
 155
 156         if ((retval = ipmp_offline(handle, ifname, 1)) != IPMP_SUCCESS)
 157                 die("cannot offline %s: %s\n", ifname, mpadm_errmsg(retval));
 158
 159         /*
 160          * Get all the up addresses for `ifname' and bring them down.
 161          */
 162         if (ifaddrlistx(ifname, IFF_UP, 0, &ifaddrs) == -1)
 163                 die("cannot get addresses on %s", ifname);
 164
 165         for (ifaddrp = ifaddrs; ifaddrp != NULL; ifaddrp = ifaddrp->ia_next) {
 166                 if (!(ifaddrp->ia_flags & IFF_OFFLINE))
 167                         warn("IFF_OFFLINE vanished on %s\n", ifaddrp->ia_name);
 168
 169                 if (!set_lifflags(ifaddrp->ia_name,
 170                     ifaddrp->ia_flags & ~IFF_UP))
 171                         warn("cannot bring down address on %s",
 172                             ifaddrp->ia_name);
 173         }
 174
 175         ifaddrlistx_free(ifaddrs);
 176 }
 177
 178 static void
 179 undo_offline(const char *ifname, ipmp_handle_t handle)
 180 {
 181         ifaddrlistx_t *ifaddrp, *ifaddrs;
 182         int retval;
 183
 184         if (!is_offline(ifname))
 185                 die("interface %s is not offline\n", ifname);
 186
 187         /*
 188          * Get all the down addresses for `ifname' and bring them up.
 189          */
 190         if (ifaddrlistx(ifname, 0, IFF_UP, &ifaddrs) == -1)
 191                 die("cannot get addresses for %s", ifname);
 192
 193         for (ifaddrp = ifaddrs; ifaddrp != NULL; ifaddrp = ifaddrp->ia_next) {
 194                 if (!(ifaddrp->ia_flags & IFF_OFFLINE))
 195                         warn("IFF_OFFLINE vanished on %s\n", ifaddrp->ia_name);
 196
 197                 if (!set_lifflags(ifaddrp->ia_name, ifaddrp->ia_flags | IFF_UP))
 198                         warn("cannot bring up address on %s", ifaddrp->ia_name);
 199         }
 200
 201         ifaddrlistx_free(ifaddrs);
 202
 203         /*
 204          * Undo the offline.
 205          */
 206         if ((retval = ipmp_undo_offline(handle, ifname)) != IPMP_SUCCESS) {
 207                 die("cannot undo-offline %s: %s\n", ifname,
 208                     mpadm_errmsg(retval));
 209         }
 210
 211         /*
 212          * Verify whether IFF_OFFLINE is set as a sanity check.
 213          */
 214         if (is_offline(ifname))
 215                 warn("in.mpathd has not cleared IFF_OFFLINE on %s\n", ifname);
 216 }
 217
 218 /*
 219  * Change `lifname' to have `flags' set.  Returns B_TRUE on success.
 220  */
 221 static boolean_t
 222 set_lifflags(const char *lifname, uint64_t flags)
 223 {
 224         struct lifreq   lifr = { 0 };
 225         int             fd = (flags & IFF_IPV4) ? sioc4fd : sioc6fd;
 226
 227         (void) strlcpy(lifr.lifr_name, lifname, LIFNAMSIZ);
 228         lifr.lifr_flags = flags;
 229
 230         return (ioctl(fd, SIOCSLIFFLAGS, &lifr) >= 0);
 231 }
 232
 233 /* PRINTFLIKE1 */
 234 static void
 235 die(const char *format, ...)
 236 {
 237         va_list alist;
 238         char *errstr = strerror(errno);
 239
 240         format = gettext(format);
 241         (void) fprintf(stderr, gettext("%s: fatal: "), progname);
 242
 243         va_start(alist, format);
 244         (void) vfprintf(stderr, format, alist);
 245         va_end(alist);
 246
 247         if (strchr(format, '\n') == NULL)
 248                 (void) fprintf(stderr, ": %s\n", errstr);
 249
 250         exit(EXIT_FAILURE);
 251 }
 252
 253 /* PRINTFLIKE1 */
 254 static void
 255 warn(const char *format, ...)
 256 {
 257         va_list alist;
 258         char *errstr = strerror(errno);
 259
 260         format = gettext(format);
 261         (void) fprintf(stderr, gettext("%s: warning: "), progname);
 262
 263         va_start(alist, format);
 264         (void) vfprintf(stderr, format, alist);
 265         va_end(alist);
 266
 267         if (strchr(format, '\n') == NULL)
 268                 (void) fprintf(stderr, ": %s\n", errstr);
 269 }