lib/logicalrouter.c

   1 /*
   2  * Logical Router functions.
   3  * Copyright (C) 2018 6WIND S.A.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the Free
   7  * Software Foundation; either version 2 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <zebra.h>
  21
  22 #include "ns.h"
  23 #include "log.h"
  24 #include "memory.h"
  25
  26 #include "command.h"
  27 #include "vty.h"
  28 #include "logicalrouter.h"
  29
  30 /* Comment that useless define to avoid compilation error
  31  * in order to use it, one could provide the kind of NETNS to NS backend
  32  * so that the allocation will match the logical router
  33  * DEFINE_MTYPE_STATIC(LIB, LOGICALROUTER, "LogicalRouter Context")
  34  */
  35 DEFINE_MTYPE_STATIC(LIB, LOGICALROUTER_NAME, "Logical Router Name")
  36
  37 /* Logical Router node has no interface. */
  38 static struct cmd_node logicalrouter_node = {LOGICALROUTER_NODE, "",
  39                                              1};
  40
  41 static int logicalrouter_backend;
  42
  43 /* Get a NS. If not found, create one. */
  44 static struct ns *logicalrouter_get(ns_id_t ns_id)
  45 {
  46         struct ns *ns;
  47
  48         ns = ns_lookup(ns_id);
  49         if (ns)
  50                 return (ns);
  51         ns = ns_get_created(ns, NULL, ns_id);
  52         return ns;
  53 }
  54
  55 static int logicalrouter_is_backend_netns(void)
  56 {
  57         return (logicalrouter_backend == LOGICALROUTER_BACKEND_NETNS);
  58 }
  59
  60
  61 DEFUN_NOSH (logicalrouter,
  62        logicalrouter_cmd,
  63        "logical-router (1-65535) ns NAME",
  64        "Enable a logical-router\n"
  65        "Specify the logical-router indentifier\n"
  66        "The Name Space\n"
  67        "The file name in " NS_RUN_DIR ", or a full pathname\n")
  68 {
  69         int idx_number = 1;
  70         int idx_name = 3;
  71         ns_id_t ns_id;
  72         struct ns *ns = NULL;
  73         char *pathname = ns_netns_pathname(vty, argv[idx_name]->arg);
  74
  75         if (!pathname)
  76                 return CMD_WARNING_CONFIG_FAILED;
  77
  78         ns_id = strtoul(argv[idx_number]->arg, NULL, 10);
  79         ns = logicalrouter_get(ns_id);
  80
  81         if (ns->name && strcmp(ns->name, pathname) != 0) {
  82                 vty_out(vty, "NS %u is already configured with NETNS %s\n",
  83                         ns->ns_id, ns->name);
  84                 return CMD_WARNING;
  85         }
  86
  87         if (!ns->name)
  88                 ns->name = XSTRDUP(MTYPE_LOGICALROUTER_NAME, pathname);
  89
  90         if (!ns_enable(ns, NULL)) {
  91                 vty_out(vty, "Can not associate NS %u with NETNS %s\n",
  92                         ns->ns_id, ns->name);
  93                 return CMD_WARNING_CONFIG_FAILED;
  94         }
  95
  96         return CMD_SUCCESS;
  97 }
  98
  99 DEFUN (no_logicalrouter,
 100        no_logicalrouter_cmd,
 101        "no logical-router (1-65535) ns NAME",
 102        NO_STR
 103        "Enable a Logical-Router\n"
 104        "Specify the Logical-Router identifier\n"
 105        "The Name Space\n"
 106        "The file name in " NS_RUN_DIR ", or a full pathname\n")
 107 {
 108         int idx_number = 2;
 109         int idx_name = 4;
 110         ns_id_t ns_id;
 111         struct ns *ns = NULL;
 112         char *pathname = ns_netns_pathname(vty, argv[idx_name]->arg);
 113
 114         if (!pathname)
 115                 return CMD_WARNING_CONFIG_FAILED;
 116
 117         ns_id = strtoul(argv[idx_number]->arg, NULL, 10);
 118         ns = ns_lookup(ns_id);
 119
 120         if (!ns) {
 121                 vty_out(vty, "NS %u is not found\n", ns_id);
 122                 return CMD_SUCCESS;
 123         }
 124
 125         if (ns->name && strcmp(ns->name, pathname) != 0) {
 126                 vty_out(vty, "Incorrect NETNS file name\n");
 127                 return CMD_WARNING_CONFIG_FAILED;
 128         }
 129
 130         ns_disable(ns);
 131
 132         if (ns->name) {
 133                 XFREE(MTYPE_LOGICALROUTER_NAME, ns->name);
 134                 ns->name = NULL;
 135         }
 136
 137         return CMD_SUCCESS;
 138 }
 139
 140 /* Initialize NS module. */
 141 void logicalrouter_init(int (*writefunc)(struct vty *vty))
 142 {
 143         if (ns_have_netns() && logicalrouter_is_backend_netns()) {
 144                 /* Install LogicalRouter commands. */
 145                 install_node(&logicalrouter_node, writefunc);
 146                 install_element(CONFIG_NODE, &logicalrouter_cmd);
 147                 install_element(CONFIG_NODE, &no_logicalrouter_cmd);
 148         }
 149 }
 150
 151 void logicalrouter_terminate(void)
 152 {
 153         ns_terminate();
 154 }
 155
 156 void logicalrouter_configure_backend(int backend_netns)
 157 {
 158         logicalrouter_backend = backend_netns;
 159 }