ripd/rip_zebra.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* RIPd and zebra interface.
   3  * Copyright (C) 1997, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
   4  */
   5
   6 #include <zebra.h>
   7
   8 #include "command.h"
   9 #include "prefix.h"
  10 #include "table.h"
  11 #include "stream.h"
  12 #include "memory.h"
  13 #include "zclient.h"
  14 #include "log.h"
  15 #include "vrf.h"
  16 #include "ripd/ripd.h"
  17 #include "ripd/rip_debug.h"
  18 #include "ripd/rip_interface.h"
  19
  20 /* All information about zebra. */
  21 struct zclient *zclient = NULL;
  22
  23 /* Send ECMP routes to zebra. */
  24 static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
  25                                 uint8_t cmd)
  26 {
  27         struct list *list = (struct list *)rp->info;
  28         struct zapi_route api;
  29         struct zapi_nexthop *api_nh;
  30         struct listnode *listnode = NULL;
  31         struct rip_info *rinfo = NULL;
  32         int count = 0;
  33
  34         memset(&api, 0, sizeof(api));
  35         api.vrf_id = rip->vrf->vrf_id;
  36         api.type = ZEBRA_ROUTE_RIP;
  37         api.safi = SAFI_UNICAST;
  38
  39         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  40         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  41                 if (count >= MULTIPATH_NUM)
  42                         break;
  43                 api_nh = &api.nexthops[count];
  44                 api_nh->vrf_id = rip->vrf->vrf_id;
  45                 api_nh->gate = rinfo->nh.gate;
  46                 api_nh->type = NEXTHOP_TYPE_IPV4;
  47                 if (cmd == ZEBRA_ROUTE_ADD)
  48                         SET_FLAG(rinfo->flags, RIP_RTF_FIB);
  49                 else
  50                         UNSET_FLAG(rinfo->flags, RIP_RTF_FIB);
  51                 count++;
  52         }
  53
  54         api.prefix = rp->p;
  55         api.nexthop_num = count;
  56
  57         rinfo = listgetdata(listhead(list));
  58
  59         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  60         api.metric = rinfo->metric;
  61
  62         if (rinfo->distance && rinfo->distance != ZEBRA_RIP_DISTANCE_DEFAULT) {
  63                 SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
  64                 api.distance = rinfo->distance;
  65         }
  66
  67         if (rinfo->tag) {
  68                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  69                 api.tag = rinfo->tag;
  70         }
  71
  72         zclient_route_send(cmd, zclient, &api);
  73
  74         if (IS_RIP_DEBUG_ZEBRA) {
  75                 if (rip->ecmp)
  76                         zlog_debug("%s: %pFX nexthops %d",
  77                                    (cmd == ZEBRA_ROUTE_ADD)
  78                                            ? "Install into zebra"
  79                                            : "Delete from zebra",
  80                                    &rp->p, count);
  81                 else
  82                         zlog_debug("%s: %pFX",
  83                                    (cmd == ZEBRA_ROUTE_ADD)
  84                                            ? "Install into zebra"
  85                                            : "Delete from zebra", &rp->p);
  86         }
  87
  88         rip->counters.route_changes++;
  89 }
  90
  91 /* Add/update ECMP routes to zebra. */
  92 void rip_zebra_ipv4_add(struct rip *rip, struct route_node *rp)
  93 {
  94         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_ADD);
  95 }
  96
  97 /* Delete ECMP routes from zebra. */
  98 void rip_zebra_ipv4_delete(struct rip *rip, struct route_node *rp)
  99 {
 100         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_DELETE);
 101 }
 102
 103 /* Zebra route add and delete treatment. */
 104 static int rip_zebra_read_route(ZAPI_CALLBACK_ARGS)
 105 {
 106         struct rip *rip;
 107         struct zapi_route api;
 108         struct nexthop nh;
 109
 110         rip = rip_lookup_by_vrf_id(vrf_id);
 111         if (!rip)
 112                 return 0;
 113
 114         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 115                 return -1;
 116
 117         memset(&nh, 0, sizeof(nh));
 118         nh.type = api.nexthops[0].type;
 119         nh.gate.ipv4 = api.nexthops[0].gate.ipv4;
 120         nh.ifindex = api.nexthops[0].ifindex;
 121
 122         /* Then fetch IPv4 prefixes. */
 123         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 124                 rip_redistribute_add(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 125                                      (struct prefix_ipv4 *)&api.prefix, &nh,
 126                                      api.metric, api.distance, api.tag);
 127         else if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL)
 128                 rip_redistribute_delete(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 129                                         (struct prefix_ipv4 *)&api.prefix,
 130                                         nh.ifindex);
 131
 132         return 0;
 133 }
 134
 135 void rip_redistribute_conf_update(struct rip *rip, int type)
 136 {
 137         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 138                                 type, 0, rip->vrf->vrf_id);
 139 }
 140
 141 void rip_redistribute_conf_delete(struct rip *rip, int type)
 142 {
 143         if (zclient->sock > 0)
 144                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 145                                         AFI_IP, type, 0, rip->vrf->vrf_id);
 146
 147         /* Remove the routes from RIP table. */
 148         rip_redistribute_withdraw(rip, type);
 149 }
 150
 151 int rip_redistribute_check(struct rip *rip, int type)
 152 {
 153         return rip->redist[type].enabled;
 154 }
 155
 156 void rip_redistribute_enable(struct rip *rip)
 157 {
 158         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 159                 if (!rip_redistribute_check(rip, i))
 160                         continue;
 161
 162                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 163                                         i, 0, rip->vrf->vrf_id);
 164         }
 165 }
 166
 167 void rip_redistribute_disable(struct rip *rip)
 168 {
 169         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 170                 if (!rip_redistribute_check(rip, i))
 171                         continue;
 172
 173                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 174                                         AFI_IP, i, 0, rip->vrf->vrf_id);
 175         }
 176 }
 177
 178 void rip_show_redistribute_config(struct vty *vty, struct rip *rip)
 179 {
 180         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 181                 if (i == zclient->redist_default
 182                     || !rip_redistribute_check(rip, i))
 183                         continue;
 184
 185                 vty_out(vty, " %s", zebra_route_string(i));
 186         }
 187 }
 188
 189 void rip_zebra_vrf_register(struct vrf *vrf)
 190 {
 191         if (vrf->vrf_id == VRF_DEFAULT)
 192                 return;
 193
 194         if (IS_RIP_DEBUG_EVENT)
 195                 zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
 196                            vrf->name, vrf->vrf_id);
 197
 198         zclient_send_reg_requests(zclient, vrf->vrf_id);
 199 }
 200
 201 void rip_zebra_vrf_deregister(struct vrf *vrf)
 202 {
 203         if (vrf->vrf_id == VRF_DEFAULT)
 204                 return;
 205
 206         if (IS_RIP_DEBUG_EVENT)
 207                 zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
 208                            vrf->name, vrf->vrf_id);
 209
 210         zclient_send_dereg_requests(zclient, vrf->vrf_id);
 211 }
 212
 213 static void rip_zebra_connected(struct zclient *zclient)
 214 {
 215         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 216 }
 217
 218 zclient_handler *const rip_handlers[] = {
 219         [ZEBRA_INTERFACE_ADDRESS_ADD] = rip_interface_address_add,
 220         [ZEBRA_INTERFACE_ADDRESS_DELETE] = rip_interface_address_delete,
 221         [ZEBRA_INTERFACE_VRF_UPDATE] = rip_interface_vrf_update,
 222         [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = rip_zebra_read_route,
 223         [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = rip_zebra_read_route,
 224 };
 225
 226 void rip_zclient_init(struct event_loop *master)
 227 {
 228         /* Set default value to the zebra client structure. */
 229         zclient = zclient_new(master, &zclient_options_default, rip_handlers,
 230                               array_size(rip_handlers));
 231         zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
 232         zclient->zebra_connected = rip_zebra_connected;
 233 }
 234
 235 void rip_zclient_stop(void)
 236 {
 237         zclient_stop(zclient);
 238         zclient_free(zclient);
 239 }