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 "bfd.h"
  17 #include "ripd/ripd.h"
  18 #include "ripd/rip_debug.h"
  19 #include "ripd/rip_interface.h"
  20
  21 /* All information about zebra. */
  22 struct zclient *zclient = NULL;
  23
  24 /* Send ECMP routes to zebra. */
  25 static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
  26                                 uint8_t cmd)
  27 {
  28         struct list *list = (struct list *)rp->info;
  29         struct zapi_route api;
  30         struct zapi_nexthop *api_nh;
  31         struct listnode *listnode = NULL;
  32         struct rip_info *rinfo = NULL;
  33         int count = 0;
  34
  35         memset(&api, 0, sizeof(api));
  36         api.vrf_id = rip->vrf->vrf_id;
  37         api.type = ZEBRA_ROUTE_RIP;
  38         api.safi = SAFI_UNICAST;
  39
  40         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  41         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  42                 if (count >= MULTIPATH_NUM)
  43                         break;
  44                 api_nh = &api.nexthops[count];
  45                 api_nh->vrf_id = rip->vrf->vrf_id;
  46                 api_nh->gate = rinfo->nh.gate;
  47                 api_nh->type = NEXTHOP_TYPE_IPV4;
  48                 if (cmd == ZEBRA_ROUTE_ADD)
  49                         SET_FLAG(rinfo->flags, RIP_RTF_FIB);
  50                 else
  51                         UNSET_FLAG(rinfo->flags, RIP_RTF_FIB);
  52                 count++;
  53         }
  54
  55         api.prefix = rp->p;
  56         api.nexthop_num = count;
  57
  58         rinfo = listgetdata(listhead(list));
  59
  60         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  61         api.metric = rinfo->metric;
  62
  63         if (rinfo->distance && rinfo->distance != ZEBRA_RIP_DISTANCE_DEFAULT) {
  64                 SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
  65                 api.distance = rinfo->distance;
  66         }
  67
  68         if (rinfo->tag) {
  69                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  70                 api.tag = rinfo->tag;
  71         }
  72
  73         zclient_route_send(cmd, zclient, &api);
  74
  75         if (IS_RIP_DEBUG_ZEBRA) {
  76                 if (rip->ecmp)
  77                         zlog_debug("%s: %pFX nexthops %d",
  78                                    (cmd == ZEBRA_ROUTE_ADD)
  79                                            ? "Install into zebra"
  80                                            : "Delete from zebra",
  81                                    &rp->p, count);
  82                 else
  83                         zlog_debug("%s: %pFX",
  84                                    (cmd == ZEBRA_ROUTE_ADD)
  85                                            ? "Install into zebra"
  86                                            : "Delete from zebra", &rp->p);
  87         }
  88
  89         rip->counters.route_changes++;
  90 }
  91
  92 /* Add/update ECMP routes to zebra. */
  93 void rip_zebra_ipv4_add(struct rip *rip, struct route_node *rp)
  94 {
  95         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_ADD);
  96 }
  97
  98 /* Delete ECMP routes from zebra. */
  99 void rip_zebra_ipv4_delete(struct rip *rip, struct route_node *rp)
 100 {
 101         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_DELETE);
 102 }
 103
 104 /* Zebra route add and delete treatment. */
 105 static int rip_zebra_read_route(ZAPI_CALLBACK_ARGS)
 106 {
 107         struct rip *rip;
 108         struct zapi_route api;
 109         struct nexthop nh;
 110
 111         rip = rip_lookup_by_vrf_id(vrf_id);
 112         if (!rip)
 113                 return 0;
 114
 115         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 116                 return -1;
 117
 118         memset(&nh, 0, sizeof(nh));
 119         nh.type = api.nexthops[0].type;
 120         nh.gate.ipv4 = api.nexthops[0].gate.ipv4;
 121         nh.ifindex = api.nexthops[0].ifindex;
 122
 123         /* Then fetch IPv4 prefixes. */
 124         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 125                 rip_redistribute_add(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 126                                      (struct prefix_ipv4 *)&api.prefix, &nh,
 127                                      api.metric, api.distance, api.tag);
 128         else if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL)
 129                 rip_redistribute_delete(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 130                                         (struct prefix_ipv4 *)&api.prefix,
 131                                         nh.ifindex);
 132
 133         return 0;
 134 }
 135
 136 void rip_redistribute_conf_update(struct rip *rip, int type)
 137 {
 138         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 139                                 type, 0, rip->vrf->vrf_id);
 140 }
 141
 142 void rip_redistribute_conf_delete(struct rip *rip, int type)
 143 {
 144         if (zclient->sock > 0)
 145                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 146                                         AFI_IP, type, 0, rip->vrf->vrf_id);
 147
 148         /* Remove the routes from RIP table. */
 149         rip_redistribute_withdraw(rip, type);
 150 }
 151
 152 int rip_redistribute_check(struct rip *rip, int type)
 153 {
 154         return rip->redist[type].enabled;
 155 }
 156
 157 void rip_redistribute_enable(struct rip *rip)
 158 {
 159         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 160                 if (!rip_redistribute_check(rip, i))
 161                         continue;
 162
 163                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 164                                         i, 0, rip->vrf->vrf_id);
 165         }
 166 }
 167
 168 void rip_redistribute_disable(struct rip *rip)
 169 {
 170         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 171                 if (!rip_redistribute_check(rip, i))
 172                         continue;
 173
 174                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 175                                         AFI_IP, i, 0, rip->vrf->vrf_id);
 176         }
 177 }
 178
 179 void rip_show_redistribute_config(struct vty *vty, struct rip *rip)
 180 {
 181         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 182                 if (i == zclient->redist_default
 183                     || !rip_redistribute_check(rip, i))
 184                         continue;
 185
 186                 vty_out(vty, " %s", zebra_route_string(i));
 187         }
 188 }
 189
 190 void rip_zebra_vrf_register(struct vrf *vrf)
 191 {
 192         if (vrf->vrf_id == VRF_DEFAULT)
 193                 return;
 194
 195         if (IS_RIP_DEBUG_EVENT)
 196                 zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
 197                            vrf->name, vrf->vrf_id);
 198
 199         zclient_send_reg_requests(zclient, vrf->vrf_id);
 200         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf->vrf_id);
 201 }
 202
 203 void rip_zebra_vrf_deregister(struct vrf *vrf)
 204 {
 205         if (vrf->vrf_id == VRF_DEFAULT)
 206                 return;
 207
 208         if (IS_RIP_DEBUG_EVENT)
 209                 zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
 210                            vrf->name, vrf->vrf_id);
 211
 212         zclient_send_dereg_requests(zclient, vrf->vrf_id);
 213         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_DEREGISTER, vrf->vrf_id);
 214 }
 215
 216 static void rip_zebra_connected(struct zclient *zclient)
 217 {
 218         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 219         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, VRF_DEFAULT);
 220 }
 221
 222 zclient_handler *const rip_handlers[] = {
 223         [ZEBRA_INTERFACE_ADDRESS_ADD] = rip_interface_address_add,
 224         [ZEBRA_INTERFACE_ADDRESS_DELETE] = rip_interface_address_delete,
 225         [ZEBRA_INTERFACE_VRF_UPDATE] = rip_interface_vrf_update,
 226         [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = rip_zebra_read_route,
 227         [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = rip_zebra_read_route,
 228 };
 229
 230 void rip_zclient_init(struct event_loop *master)
 231 {
 232         /* Set default value to the zebra client structure. */
 233         zclient = zclient_new(master, &zclient_options_default, rip_handlers,
 234                               array_size(rip_handlers));
 235         zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
 236         zclient->zebra_connected = rip_zebra_connected;
 237 }
 238
 239 void rip_zclient_stop(void)
 240 {
 241         zclient_stop(zclient);
 242         zclient_free(zclient);
 243 }