ripngd/ripng_offset.c

   1 /* RIPng offset-list
   2  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22  /* RIPng support by Vincent Jardin <vincent.jardin@6wind.com>
  23   * Copyright (C) 2002 6WIND
  24   */
  25
  26 #include <zebra.h>
  27
  28 #include "if.h"
  29 #include "prefix.h"
  30 #include "filter.h"
  31 #include "command.h"
  32 #include "linklist.h"
  33 #include "memory.h"
  34
  35 #include "ripngd/ripngd.h"
  36
  37 #define RIPNG_OFFSET_LIST_IN  0
  38 #define RIPNG_OFFSET_LIST_OUT 1
  39 #define RIPNG_OFFSET_LIST_MAX 2
  40
  41 struct ripng_offset_list
  42 {
  43   char *ifname;
  44
  45   struct
  46   {
  47     char *alist_name;
  48     /* struct access_list *alist; */
  49     int metric;
  50   } direct[RIPNG_OFFSET_LIST_MAX];
  51 };
  52
  53 static struct list *ripng_offset_list_master;
  54
  55 static int
  56 strcmp_safe (const char *s1, const char *s2)
  57 {
  58   if (s1 == NULL && s2 == NULL)
  59     return 0;
  60   if (s1 == NULL)
  61     return -1;
  62   if (s2 == NULL)
  63     return 1;
  64   return strcmp (s1, s2);
  65 }
  66
  67 static struct ripng_offset_list *
  68 ripng_offset_list_new ()
  69 {
  70   struct ripng_offset_list *new;
  71
  72   new = XCALLOC (MTYPE_RIPNG_OFFSET_LIST, sizeof (struct ripng_offset_list));
  73   return new;
  74 }
  75
  76 static void
  77 ripng_offset_list_free (struct ripng_offset_list *offset)
  78 {
  79   XFREE (MTYPE_RIPNG_OFFSET_LIST, offset);
  80 }
  81
  82 static struct ripng_offset_list *
  83 ripng_offset_list_lookup (const char *ifname)
  84 {
  85   struct ripng_offset_list *offset;
  86   struct listnode *node, *nnode;
  87
  88   for (ALL_LIST_ELEMENTS (ripng_offset_list_master, node, nnode, offset))
  89     {
  90       if (strcmp_safe (offset->ifname, ifname) == 0)
  91         return offset;
  92     }
  93   return NULL;
  94 }
  95
  96 static struct ripng_offset_list *
  97 ripng_offset_list_get (const char *ifname)
  98 {
  99   struct ripng_offset_list *offset;
 100
 101   offset = ripng_offset_list_lookup (ifname);
 102   if (offset)
 103     return offset;
 104
 105   offset = ripng_offset_list_new ();
 106   if (ifname)
 107     offset->ifname = strdup (ifname);
 108   listnode_add_sort (ripng_offset_list_master, offset);
 109
 110   return offset;
 111 }
 112
 113 static int
 114 ripng_offset_list_set (struct vty *vty, const char *alist,
 115                        const char *direct_str, const char *metric_str,
 116                        const char *ifname)
 117 {
 118   int direct;
 119   int metric;
 120   struct ripng_offset_list *offset;
 121
 122   /* Check direction. */
 123   if (strncmp (direct_str, "i", 1) == 0)
 124     direct = RIPNG_OFFSET_LIST_IN;
 125   else if (strncmp (direct_str, "o", 1) == 0)
 126     direct = RIPNG_OFFSET_LIST_OUT;
 127   else
 128     {
 129       vty_out (vty, "Invalid direction: %s%s", direct_str, VTY_NEWLINE);
 130       return CMD_WARNING;
 131     }
 132
 133   /* Check metric. */
 134   metric = atoi (metric_str);
 135   if (metric < 0 || metric > 16)
 136     {
 137       vty_out (vty, "Invalid metric: %s%s", metric_str, VTY_NEWLINE);
 138       return CMD_WARNING;
 139     }
 140
 141   /* Get offset-list structure with interface name. */
 142   offset = ripng_offset_list_get (ifname);
 143
 144   if (offset->direct[direct].alist_name)
 145     free (offset->direct[direct].alist_name);
 146   offset->direct[direct].alist_name = strdup (alist);
 147   offset->direct[direct].metric = metric;
 148
 149   return CMD_SUCCESS;
 150 }
 151
 152 static int
 153 ripng_offset_list_unset (struct vty *vty, const char *alist,
 154                          const char *direct_str, const char *metric_str,
 155                          const char *ifname)
 156 {
 157   int direct;
 158   int metric;
 159   struct ripng_offset_list *offset;
 160
 161   /* Check direction. */
 162   if (strncmp (direct_str, "i", 1) == 0)
 163     direct = RIPNG_OFFSET_LIST_IN;
 164   else if (strncmp (direct_str, "o", 1) == 0)
 165     direct = RIPNG_OFFSET_LIST_OUT;
 166   else
 167     {
 168       vty_out (vty, "Invalid direction: %s%s", direct_str, VTY_NEWLINE);
 169       return CMD_WARNING;
 170     }
 171
 172   /* Check metric. */
 173   metric = atoi (metric_str);
 174   if (metric < 0 || metric > 16)
 175     {
 176       vty_out (vty, "Invalid metric: %s%s", metric_str, VTY_NEWLINE);
 177       return CMD_WARNING;
 178     }
 179
 180   /* Get offset-list structure with interface name. */
 181   offset = ripng_offset_list_lookup (ifname);
 182
 183   if (offset)
 184     {
 185       if (offset->direct[direct].alist_name)
 186         free (offset->direct[direct].alist_name);
 187       offset->direct[direct].alist_name = NULL;
 188
 189       if (offset->direct[RIPNG_OFFSET_LIST_IN].alist_name == NULL &&
 190           offset->direct[RIPNG_OFFSET_LIST_OUT].alist_name == NULL)
 191         {
 192           listnode_delete (ripng_offset_list_master, offset);
 193           if (offset->ifname)
 194             free (offset->ifname);
 195           ripng_offset_list_free (offset);
 196         }
 197     }
 198   else
 199     {
 200       vty_out (vty, "Can't find offset-list%s", VTY_NEWLINE);
 201       return CMD_WARNING;
 202     }
 203   return CMD_SUCCESS;
 204 }
 205
 206 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].alist_name)
 207 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].metric)
 208
 209 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
 210 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].metric)
 211
 212 /* If metric is modifed return 1. */
 213 int
 214 ripng_offset_list_apply_in (struct prefix_ipv6 *p, struct interface *ifp,
 215                             u_char *metric)
 216 {
 217   struct ripng_offset_list *offset;
 218   struct access_list *alist;
 219
 220   /* Look up offset-list with interface name. */
 221   offset = ripng_offset_list_lookup (ifp->name);
 222   if (offset && OFFSET_LIST_IN_NAME (offset))
 223     {
 224       alist = access_list_lookup (AFI_IP6, OFFSET_LIST_IN_NAME (offset));
 225
 226       if (alist
 227           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 228         {
 229           *metric += OFFSET_LIST_IN_METRIC (offset);
 230           return 1;
 231         }
 232       return 0;
 233     }
 234   /* Look up offset-list without interface name. */
 235   offset = ripng_offset_list_lookup (NULL);
 236   if (offset && OFFSET_LIST_IN_NAME (offset))
 237     {
 238       alist = access_list_lookup (AFI_IP6, OFFSET_LIST_IN_NAME (offset));
 239
 240       if (alist
 241           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 242         {
 243           *metric += OFFSET_LIST_IN_METRIC (offset);
 244           return 1;
 245         }
 246       return 0;
 247     }
 248   return 0;
 249 }
 250
 251 /* If metric is modifed return 1. */
 252 int
 253 ripng_offset_list_apply_out (struct prefix_ipv6 *p, struct interface *ifp,
 254                              u_char *metric)
 255 {
 256   struct ripng_offset_list *offset;
 257   struct access_list *alist;
 258
 259   /* Look up offset-list with interface name. */
 260   offset = ripng_offset_list_lookup (ifp->name);
 261   if (offset && OFFSET_LIST_OUT_NAME (offset))
 262     {
 263       alist = access_list_lookup (AFI_IP6, OFFSET_LIST_OUT_NAME (offset));
 264
 265       if (alist
 266           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 267         {
 268           *metric += OFFSET_LIST_OUT_METRIC (offset);
 269           return 1;
 270         }
 271       return 0;
 272     }
 273
 274   /* Look up offset-list without interface name. */
 275   offset = ripng_offset_list_lookup (NULL);
 276   if (offset && OFFSET_LIST_OUT_NAME (offset))
 277     {
 278       alist = access_list_lookup (AFI_IP6, OFFSET_LIST_OUT_NAME (offset));
 279
 280       if (alist
 281           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 282         {
 283           *metric += OFFSET_LIST_OUT_METRIC (offset);
 284           return 1;
 285         }
 286       return 0;
 287     }
 288   return 0;
 289 }
 290
 291 DEFUN (ripng_offset_list,
 292        ripng_offset_list_cmd,
 293        "offset-list WORD (in|out) <0-16>",
 294        "Modify RIPng metric\n"
 295        "Access-list name\n"
 296        "For incoming updates\n"
 297        "For outgoing updates\n"
 298        "Metric value\n")
 299 {
 300   return ripng_offset_list_set (vty, argv[0], argv[1], argv[2], NULL);
 301 }
 302
 303 DEFUN (ripng_offset_list_ifname,
 304        ripng_offset_list_ifname_cmd,
 305        "offset-list WORD (in|out) <0-16> IFNAME",
 306        "Modify RIPng metric\n"
 307        "Access-list name\n"
 308        "For incoming updates\n"
 309        "For outgoing updates\n"
 310        "Metric value\n"
 311        "Interface to match\n")
 312 {
 313   return ripng_offset_list_set (vty, argv[0], argv[1], argv[2], argv[3]);
 314 }
 315
 316 DEFUN (no_ripng_offset_list,
 317        no_ripng_offset_list_cmd,
 318        "no offset-list WORD (in|out) <0-16>",
 319        NO_STR
 320        "Modify RIPng metric\n"
 321        "Access-list name\n"
 322        "For incoming updates\n"
 323        "For outgoing updates\n"
 324        "Metric value\n")
 325 {
 326   return ripng_offset_list_unset (vty, argv[0], argv[1], argv[2], NULL);
 327 }
 328
 329 DEFUN (no_ripng_offset_list_ifname,
 330        no_ripng_offset_list_ifname_cmd,
 331        "no offset-list WORD (in|out) <0-16> IFNAME",
 332        NO_STR
 333        "Modify RIPng metric\n"
 334        "Access-list name\n"
 335        "For incoming updates\n"
 336        "For outgoing updates\n"
 337        "Metric value\n"
 338        "Interface to match\n")
 339 {
 340   return ripng_offset_list_unset (vty, argv[0], argv[1], argv[2], argv[3]);
 341 }
 342
 343 static int
 344 offset_list_cmp (struct ripng_offset_list *o1, struct ripng_offset_list *o2)
 345 {
 346   return strcmp_safe (o1->ifname, o2->ifname);
 347 }
 348
 349 static void
 350 offset_list_del (struct ripng_offset_list *offset)
 351 {
 352   if (OFFSET_LIST_IN_NAME (offset))
 353     free (OFFSET_LIST_IN_NAME (offset));
 354   if (OFFSET_LIST_OUT_NAME (offset))
 355     free (OFFSET_LIST_OUT_NAME (offset));
 356   if (offset->ifname)
 357     free (offset->ifname);
 358   ripng_offset_list_free (offset);
 359 }
 360
 361 void
 362 ripng_offset_init (void)
 363 {
 364   ripng_offset_list_master = list_new ();
 365   ripng_offset_list_master->cmp = (int (*)(void *, void *)) offset_list_cmp;
 366   ripng_offset_list_master->del = (void (*)(void *)) offset_list_del;
 367
 368   install_element (RIPNG_NODE, &ripng_offset_list_cmd);
 369   install_element (RIPNG_NODE, &ripng_offset_list_ifname_cmd);
 370   install_element (RIPNG_NODE, &no_ripng_offset_list_cmd);
 371   install_element (RIPNG_NODE, &no_ripng_offset_list_ifname_cmd);
 372 }
 373
 374 void
 375 ripng_offset_clean (void)
 376 {
 377   list_delete (ripng_offset_list_master);
 378
 379   ripng_offset_list_master = list_new ();
 380   ripng_offset_list_master->cmp = (int (*)(void *, void *)) offset_list_cmp;
 381   ripng_offset_list_master->del = (void (*)(void *)) offset_list_del;
 382 }
 383
 384 int
 385 config_write_ripng_offset_list (struct vty *vty)
 386 {
 387   struct listnode *node, *nnode;
 388   struct ripng_offset_list *offset;
 389
 390   for (ALL_LIST_ELEMENTS (ripng_offset_list_master, node, nnode, offset))
 391     {
 392       if (! offset->ifname)
 393         {
 394           if (offset->direct[RIPNG_OFFSET_LIST_IN].alist_name)
 395             vty_out (vty, " offset-list %s in %d%s",
 396                      offset->direct[RIPNG_OFFSET_LIST_IN].alist_name,
 397                      offset->direct[RIPNG_OFFSET_LIST_IN].metric,
 398                      VTY_NEWLINE);
 399           if (offset->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
 400             vty_out (vty, " offset-list %s out %d%s",
 401                      offset->direct[RIPNG_OFFSET_LIST_OUT].alist_name,
 402                      offset->direct[RIPNG_OFFSET_LIST_OUT].metric,
 403                      VTY_NEWLINE);
 404         }
 405       else
 406         {
 407           if (offset->direct[RIPNG_OFFSET_LIST_IN].alist_name)
 408             vty_out (vty, " offset-list %s in %d %s%s",
 409                      offset->direct[RIPNG_OFFSET_LIST_IN].alist_name,
 410                      offset->direct[RIPNG_OFFSET_LIST_IN].metric,
 411                      offset->ifname, VTY_NEWLINE);
 412           if (offset->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
 413             vty_out (vty, " offset-list %s out %d %s%s",
 414                      offset->direct[RIPNG_OFFSET_LIST_OUT].alist_name,
 415                      offset->direct[RIPNG_OFFSET_LIST_OUT].metric,
 416                      offset->ifname, VTY_NEWLINE);
 417         }
 418     }
 419
 420   return 0;
 421 }