ripd/rip_offset.c

   1 /* RIP 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 #include <zebra.h>
  23
  24 #include "if.h"
  25 #include "prefix.h"
  26 #include "filter.h"
  27 #include "command.h"
  28 #include "linklist.h"
  29 #include "memory.h"
  30
  31 #include "ripd/ripd.h"
  32
  33 #define RIP_OFFSET_LIST_IN  0
  34 #define RIP_OFFSET_LIST_OUT 1
  35 #define RIP_OFFSET_LIST_MAX 2
  36
  37 struct rip_offset_list
  38 {
  39   char *ifname;
  40
  41   struct
  42   {
  43     char *alist_name;
  44     /* struct access_list *alist; */
  45     int metric;
  46   } direct[RIP_OFFSET_LIST_MAX];
  47 };
  48
  49 static struct list *rip_offset_list_master;
  50
  51 static int
  52 strcmp_safe (const char *s1, const char *s2)
  53 {
  54   if (s1 == NULL && s2 == NULL)
  55     return 0;
  56   if (s1 == NULL)
  57     return -1;
  58   if (s2 == NULL)
  59     return 1;
  60   return strcmp (s1, s2);
  61 }
  62
  63 static struct rip_offset_list *
  64 rip_offset_list_new (void)
  65 {
  66   return XCALLOC (MTYPE_RIP_OFFSET_LIST, sizeof (struct rip_offset_list));
  67 }
  68
  69 static void
  70 rip_offset_list_free (struct rip_offset_list *offset)
  71 {
  72   XFREE (MTYPE_RIP_OFFSET_LIST, offset);
  73 }
  74
  75 static struct rip_offset_list *
  76 rip_offset_list_lookup (const char *ifname)
  77 {
  78   struct rip_offset_list *offset;
  79   struct listnode *node, *nnode;
  80
  81   for (ALL_LIST_ELEMENTS (rip_offset_list_master, node, nnode, offset))
  82     {
  83       if (strcmp_safe (offset->ifname, ifname) == 0)
  84         return offset;
  85     }
  86   return NULL;
  87 }
  88
  89 static struct rip_offset_list *
  90 rip_offset_list_get (const char *ifname)
  91 {
  92   struct rip_offset_list *offset;
  93
  94   offset = rip_offset_list_lookup (ifname);
  95   if (offset)
  96     return offset;
  97
  98   offset = rip_offset_list_new ();
  99   if (ifname)
 100     offset->ifname = strdup (ifname);
 101   listnode_add_sort (rip_offset_list_master, offset);
 102
 103   return offset;
 104 }
 105
 106 static int
 107 rip_offset_list_set (struct vty *vty, const char *alist, const char *direct_str,
 108                      const char *metric_str, const char *ifname)
 109 {
 110   int direct;
 111   int metric;
 112   struct rip_offset_list *offset;
 113
 114   /* Check direction. */
 115   if (strncmp (direct_str, "i", 1) == 0)
 116     direct = RIP_OFFSET_LIST_IN;
 117   else if (strncmp (direct_str, "o", 1) == 0)
 118     direct = RIP_OFFSET_LIST_OUT;
 119   else
 120     {
 121       vty_out (vty, "Invalid direction: %s%s", direct_str, VTY_NEWLINE);
 122       return CMD_WARNING;
 123     }
 124
 125   /* Check metric. */
 126   metric = atoi (metric_str);
 127   if (metric < 0 || metric > 16)
 128     {
 129       vty_out (vty, "Invalid metric: %s%s", metric_str, VTY_NEWLINE);
 130       return CMD_WARNING;
 131     }
 132
 133   /* Get offset-list structure with interface name. */
 134   offset = rip_offset_list_get (ifname);
 135
 136   if (offset->direct[direct].alist_name)
 137     free (offset->direct[direct].alist_name);
 138   offset->direct[direct].alist_name = strdup (alist);
 139   offset->direct[direct].metric = metric;
 140
 141   return CMD_SUCCESS;
 142 }
 143
 144 static int
 145 rip_offset_list_unset (struct vty *vty, const char *alist,
 146                        const char *direct_str, const char *metric_str,
 147                        const char *ifname)
 148 {
 149   int direct;
 150   int metric;
 151   struct rip_offset_list *offset;
 152
 153   /* Check direction. */
 154   if (strncmp (direct_str, "i", 1) == 0)
 155     direct = RIP_OFFSET_LIST_IN;
 156   else if (strncmp (direct_str, "o", 1) == 0)
 157     direct = RIP_OFFSET_LIST_OUT;
 158   else
 159     {
 160       vty_out (vty, "Invalid direction: %s%s", direct_str, VTY_NEWLINE);
 161       return CMD_WARNING;
 162     }
 163
 164   /* Check metric. */
 165   metric = atoi (metric_str);
 166   if (metric < 0 || metric > 16)
 167     {
 168       vty_out (vty, "Invalid metric: %s%s", metric_str, VTY_NEWLINE);
 169       return CMD_WARNING;
 170     }
 171
 172   /* Get offset-list structure with interface name. */
 173   offset = rip_offset_list_lookup (ifname);
 174
 175   if (offset)
 176     {
 177       if (offset->direct[direct].alist_name)
 178         free (offset->direct[direct].alist_name);
 179       offset->direct[direct].alist_name = NULL;
 180
 181       if (offset->direct[RIP_OFFSET_LIST_IN].alist_name == NULL &&
 182           offset->direct[RIP_OFFSET_LIST_OUT].alist_name == NULL)
 183         {
 184           listnode_delete (rip_offset_list_master, offset);
 185           if (offset->ifname)
 186             free (offset->ifname);
 187           rip_offset_list_free (offset);
 188         }
 189     }
 190   else
 191     {
 192       vty_out (vty, "Can't find offset-list%s", VTY_NEWLINE);
 193       return CMD_WARNING;
 194     }
 195   return CMD_SUCCESS;
 196 }
 197
 198 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_IN].alist_name)
 199 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_IN].metric)
 200
 201 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].alist_name)
 202 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].metric)
 203
 204 /* If metric is modifed return 1. */
 205 int
 206 rip_offset_list_apply_in (struct prefix_ipv4 *p, struct interface *ifp,
 207                           u_int32_t *metric)
 208 {
 209   struct rip_offset_list *offset;
 210   struct access_list *alist;
 211
 212   /* Look up offset-list with interface name. */
 213   offset = rip_offset_list_lookup (ifp->name);
 214   if (offset && OFFSET_LIST_IN_NAME (offset))
 215     {
 216       alist = access_list_lookup (AFI_IP, OFFSET_LIST_IN_NAME (offset));
 217
 218       if (alist
 219           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 220         {
 221           *metric += OFFSET_LIST_IN_METRIC (offset);
 222           return 1;
 223         }
 224       return 0;
 225     }
 226   /* Look up offset-list without interface name. */
 227   offset = rip_offset_list_lookup (NULL);
 228   if (offset && OFFSET_LIST_IN_NAME (offset))
 229     {
 230       alist = access_list_lookup (AFI_IP, OFFSET_LIST_IN_NAME (offset));
 231
 232       if (alist
 233           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 234         {
 235           *metric += OFFSET_LIST_IN_METRIC (offset);
 236           return 1;
 237         }
 238       return 0;
 239     }
 240   return 0;
 241 }
 242
 243 /* If metric is modifed return 1. */
 244 int
 245 rip_offset_list_apply_out (struct prefix_ipv4 *p, struct interface *ifp,
 246                           u_int32_t *metric)
 247 {
 248   struct rip_offset_list *offset;
 249   struct access_list *alist;
 250
 251   /* Look up offset-list with interface name. */
 252   offset = rip_offset_list_lookup (ifp->name);
 253   if (offset && OFFSET_LIST_OUT_NAME (offset))
 254     {
 255       alist = access_list_lookup (AFI_IP, OFFSET_LIST_OUT_NAME (offset));
 256
 257       if (alist
 258           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 259         {
 260           *metric += OFFSET_LIST_OUT_METRIC (offset);
 261           return 1;
 262         }
 263       return 0;
 264     }
 265
 266   /* Look up offset-list without interface name. */
 267   offset = rip_offset_list_lookup (NULL);
 268   if (offset && OFFSET_LIST_OUT_NAME (offset))
 269     {
 270       alist = access_list_lookup (AFI_IP, OFFSET_LIST_OUT_NAME (offset));
 271
 272       if (alist
 273           && access_list_apply (alist, (struct prefix *)p) == FILTER_PERMIT)
 274         {
 275           *metric += OFFSET_LIST_OUT_METRIC (offset);
 276           return 1;
 277         }
 278       return 0;
 279     }
 280   return 0;
 281 }
 282
 283 DEFUN (rip_offset_list,
 284        rip_offset_list_cmd,
 285        "offset-list WORD (in|out) <0-16>",
 286        "Modify RIP metric\n"
 287        "Access-list name\n"
 288        "For incoming updates\n"
 289        "For outgoing updates\n"
 290        "Metric value\n")
 291 {
 292   return rip_offset_list_set (vty, argv[0], argv[1], argv[2], NULL);
 293 }
 294
 295 DEFUN (rip_offset_list_ifname,
 296        rip_offset_list_ifname_cmd,
 297        "offset-list WORD (in|out) <0-16> IFNAME",
 298        "Modify RIP metric\n"
 299        "Access-list name\n"
 300        "For incoming updates\n"
 301        "For outgoing updates\n"
 302        "Metric value\n"
 303        "Interface to match\n")
 304 {
 305   return rip_offset_list_set (vty, argv[0], argv[1], argv[2], argv[3]);
 306 }
 307
 308 DEFUN (no_rip_offset_list,
 309        no_rip_offset_list_cmd,
 310        "no offset-list WORD (in|out) <0-16>",
 311        NO_STR
 312        "Modify RIP metric\n"
 313        "Access-list name\n"
 314        "For incoming updates\n"
 315        "For outgoing updates\n"
 316        "Metric value\n")
 317 {
 318   return rip_offset_list_unset (vty, argv[0], argv[1], argv[2], NULL);
 319 }
 320
 321 DEFUN (no_rip_offset_list_ifname,
 322        no_rip_offset_list_ifname_cmd,
 323        "no offset-list WORD (in|out) <0-16> IFNAME",
 324        NO_STR
 325        "Modify RIP metric\n"
 326        "Access-list name\n"
 327        "For incoming updates\n"
 328        "For outgoing updates\n"
 329        "Metric value\n"
 330        "Interface to match\n")
 331 {
 332   return rip_offset_list_unset (vty, argv[0], argv[1], argv[2], argv[3]);
 333 }
 334
 335 static int
 336 offset_list_cmp (struct rip_offset_list *o1, struct rip_offset_list *o2)
 337 {
 338   return strcmp_safe (o1->ifname, o2->ifname);
 339 }
 340
 341 static void
 342 offset_list_del (struct rip_offset_list *offset)
 343 {
 344   if (OFFSET_LIST_IN_NAME (offset))
 345     free (OFFSET_LIST_IN_NAME (offset));
 346   if (OFFSET_LIST_OUT_NAME (offset))
 347     free (OFFSET_LIST_OUT_NAME (offset));
 348   if (offset->ifname)
 349     free (offset->ifname);
 350   rip_offset_list_free (offset);
 351 }
 352
 353 void
 354 rip_offset_init ()
 355 {
 356   rip_offset_list_master = list_new ();
 357   rip_offset_list_master->cmp = (int (*)(void *, void *)) offset_list_cmp;
 358   rip_offset_list_master->del = (void (*)(void *)) offset_list_del;
 359
 360   install_element (RIP_NODE, &rip_offset_list_cmd);
 361   install_element (RIP_NODE, &rip_offset_list_ifname_cmd);
 362   install_element (RIP_NODE, &no_rip_offset_list_cmd);
 363   install_element (RIP_NODE, &no_rip_offset_list_ifname_cmd);
 364 }
 365
 366 void
 367 rip_offset_clean ()
 368 {
 369   list_delete (rip_offset_list_master);
 370
 371   rip_offset_list_master = list_new ();
 372   rip_offset_list_master->cmp = (int (*)(void *, void *)) offset_list_cmp;
 373   rip_offset_list_master->del = (void (*)(void *)) offset_list_del;
 374 }
 375
 376 int
 377 config_write_rip_offset_list (struct vty *vty)
 378 {
 379   struct listnode *node, *nnode;
 380   struct rip_offset_list *offset;
 381
 382   for (ALL_LIST_ELEMENTS (rip_offset_list_master, node, nnode, offset))
 383     {
 384       if (! offset->ifname)
 385         {
 386           if (offset->direct[RIP_OFFSET_LIST_IN].alist_name)
 387             vty_out (vty, " offset-list %s in %d%s",
 388                      offset->direct[RIP_OFFSET_LIST_IN].alist_name,
 389                      offset->direct[RIP_OFFSET_LIST_IN].metric,
 390                      VTY_NEWLINE);
 391           if (offset->direct[RIP_OFFSET_LIST_OUT].alist_name)
 392             vty_out (vty, " offset-list %s out %d%s",
 393                      offset->direct[RIP_OFFSET_LIST_OUT].alist_name,
 394                      offset->direct[RIP_OFFSET_LIST_OUT].metric,
 395                      VTY_NEWLINE);
 396         }
 397       else
 398         {
 399           if (offset->direct[RIP_OFFSET_LIST_IN].alist_name)
 400             vty_out (vty, " offset-list %s in %d %s%s",
 401                      offset->direct[RIP_OFFSET_LIST_IN].alist_name,
 402                      offset->direct[RIP_OFFSET_LIST_IN].metric,
 403                      offset->ifname, VTY_NEWLINE);
 404           if (offset->direct[RIP_OFFSET_LIST_OUT].alist_name)
 405             vty_out (vty, " offset-list %s out %d %s%s",
 406                      offset->direct[RIP_OFFSET_LIST_OUT].alist_name,
 407                      offset->direct[RIP_OFFSET_LIST_OUT].metric,
 408                      offset->ifname, VTY_NEWLINE);
 409         }
 410     }
 411
 412   return 0;
 413 }