ripngd/ripng_zebra.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * RIPngd and zebra interface.
   4  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
   5  */
   6
   7 #include <zebra.h>
   8
   9 #include "command.h"
  10 #include "prefix.h"
  11 #include "agg_table.h"
  12 #include "stream.h"
  13 #include "memory.h"
  14 #include "routemap.h"
  15 #include "zclient.h"
  16 #include "log.h"
  17
  18 #include "ripngd/ripngd.h"
  19 #include "ripngd/ripng_debug.h"
  20
  21 /* All information about zebra. */
  22 struct zclient *zclient = NULL;
  23
  24 /* Send ECMP routes to zebra. */
  25 static void ripng_zebra_ipv6_send(struct ripng *ripng, struct agg_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 ripng_info *rinfo = NULL;
  33         int count = 0;
  34         const struct prefix *p = agg_node_get_prefix(rp);
  35
  36         memset(&api, 0, sizeof(api));
  37         api.vrf_id = ripng->vrf->vrf_id;
  38         api.type = ZEBRA_ROUTE_RIPNG;
  39         api.safi = SAFI_UNICAST;
  40         api.prefix = *p;
  41
  42         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  43         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  44                 if (count >= MULTIPATH_NUM)
  45                         break;
  46                 api_nh = &api.nexthops[count];
  47                 api_nh->vrf_id = ripng->vrf->vrf_id;
  48                 api_nh->gate.ipv6 = rinfo->nexthop;
  49                 api_nh->ifindex = rinfo->ifindex;
  50                 api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
  51                 count++;
  52                 if (cmd == ZEBRA_ROUTE_ADD)
  53                         SET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  54                 else
  55                         UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  56         }
  57
  58         api.nexthop_num = count;
  59
  60         rinfo = listgetdata(listhead(list));
  61
  62         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  63         api.metric = rinfo->metric;
  64
  65         if (rinfo->tag) {
  66                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  67                 api.tag = rinfo->tag;
  68         }
  69
  70         zclient_route_send(cmd, zclient, &api);
  71
  72         if (IS_RIPNG_DEBUG_ZEBRA) {
  73                 if (ripng->ecmp)
  74                         zlog_debug("%s: %pRN nexthops %d",
  75                                    (cmd == ZEBRA_ROUTE_ADD)
  76                                            ? "Install into zebra"
  77                                            : "Delete from zebra",
  78                                    rp, count);
  79                 else
  80                         zlog_debug("%s: %pRN",
  81                                    (cmd == ZEBRA_ROUTE_ADD)
  82                                            ? "Install into zebra"
  83                                            : "Delete from zebra",
  84                                    rp);
  85         }
  86 }
  87
  88 /* Add/update ECMP routes to zebra. */
  89 void ripng_zebra_ipv6_add(struct ripng *ripng, struct agg_node *rp)
  90 {
  91         ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_ADD);
  92 }
  93
  94 /* Delete ECMP routes from zebra. */
  95 void ripng_zebra_ipv6_delete(struct ripng *ripng, struct agg_node *rp)
  96 {
  97         ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_DELETE);
  98 }
  99
 100 /* Zebra route add and delete treatment. */
 101 static int ripng_zebra_read_route(ZAPI_CALLBACK_ARGS)
 102 {
 103         struct ripng *ripng;
 104         struct zapi_route api;
 105         struct in6_addr nexthop;
 106         unsigned long ifindex;
 107
 108         ripng = ripng_lookup_by_vrf_id(vrf_id);
 109         if (!ripng)
 110                 return 0;
 111
 112         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 113                 return -1;
 114
 115         /* we completely ignore srcdest routes for now. */
 116         if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
 117                 return 0;
 118
 119         if (IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 120                 return 0;
 121
 122         nexthop = api.nexthops[0].gate.ipv6;
 123         ifindex = api.nexthops[0].ifindex;
 124
 125         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 126                 ripng_redistribute_add(ripng, api.type,
 127                                        RIPNG_ROUTE_REDISTRIBUTE,
 128                                        (struct prefix_ipv6 *)&api.prefix,
 129                                        ifindex, &nexthop, api.tag);
 130         else
 131                 ripng_redistribute_delete(
 132                         ripng, api.type, RIPNG_ROUTE_REDISTRIBUTE,
 133                         (struct prefix_ipv6 *)&api.prefix, ifindex);
 134
 135         return 0;
 136 }
 137
 138 void ripng_redistribute_conf_update(struct ripng *ripng, int type)
 139 {
 140         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6,
 141                                 type, 0, ripng->vrf->vrf_id);
 142 }
 143
 144 void ripng_redistribute_conf_delete(struct ripng *ripng, int type)
 145 {
 146         if (zclient->sock > 0)
 147                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 148                                         AFI_IP6, type, 0, ripng->vrf->vrf_id);
 149
 150         ripng_redistribute_withdraw(ripng, type);
 151 }
 152
 153 int ripng_redistribute_check(struct ripng *ripng, int type)
 154 {
 155         return ripng->redist[type].enabled;
 156 }
 157
 158 void ripng_redistribute_enable(struct ripng *ripng)
 159 {
 160         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 161                 if (!ripng_redistribute_check(ripng, i))
 162                         continue;
 163
 164                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient,
 165                                         AFI_IP6, i, 0, ripng->vrf->vrf_id);
 166         }
 167 }
 168
 169 void ripng_redistribute_disable(struct ripng *ripng)
 170 {
 171         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 172                 if (!ripng_redistribute_check(ripng, i))
 173                         continue;
 174
 175                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 176                                         AFI_IP6, i, 0, ripng->vrf->vrf_id);
 177         }
 178 }
 179
 180 void ripng_redistribute_write(struct vty *vty, struct ripng *ripng)
 181 {
 182         int i;
 183
 184         for (i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 185                 if (i == zclient->redist_default
 186                     || !ripng_redistribute_check(ripng, i))
 187                         continue;
 188
 189                 vty_out(vty, "    %s", zebra_route_string(i));
 190         }
 191 }
 192
 193 void ripng_zebra_vrf_register(struct vrf *vrf)
 194 {
 195         if (vrf->vrf_id == VRF_DEFAULT)
 196                 return;
 197
 198         if (IS_RIPNG_DEBUG_EVENT)
 199                 zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
 200                            vrf->name, vrf->vrf_id);
 201
 202         zclient_send_reg_requests(zclient, vrf->vrf_id);
 203 }
 204
 205 void ripng_zebra_vrf_deregister(struct vrf *vrf)
 206 {
 207         if (vrf->vrf_id == VRF_DEFAULT)
 208                 return;
 209
 210         if (IS_RIPNG_DEBUG_EVENT)
 211                 zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
 212                            vrf->name, vrf->vrf_id);
 213
 214         zclient_send_dereg_requests(zclient, vrf->vrf_id);
 215 }
 216
 217 static void ripng_zebra_connected(struct zclient *zclient)
 218 {
 219         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 220 }
 221
 222 static zclient_handler *const ripng_handlers[] = {
 223         [ZEBRA_INTERFACE_ADDRESS_ADD] = ripng_interface_address_add,
 224         [ZEBRA_INTERFACE_ADDRESS_DELETE] = ripng_interface_address_delete,
 225         [ZEBRA_INTERFACE_VRF_UPDATE] = ripng_interface_vrf_update,
 226         [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = ripng_zebra_read_route,
 227         [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ripng_zebra_read_route,
 228 };
 229
 230 /* Initialize zebra structure and it's commands. */
 231 void zebra_init(struct event_loop *master)
 232 {
 233         /* Allocate zebra structure. */
 234         zclient = zclient_new(master, &zclient_options_default, ripng_handlers,
 235                               array_size(ripng_handlers));
 236         zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs);
 237
 238         zclient->zebra_connected = ripng_zebra_connected;
 239 }
 240
 241 void ripng_zebra_stop(void)
 242 {
 243         zclient_stop(zclient);
 244         zclient_free(zclient);
 245 }