vrrpd/vrrp_zebra.c

   1 /*
   2  * VRRP Zebra interfacing.
   3  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
   4  * Quentin Young
   5  *
   6  * This program 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 Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20 #include <zebra.h>
  21
  22 #include "lib/if.h"
  23 #include "lib/linklist.h"
  24 #include "lib/log.h"
  25 #include "lib/prefix.h"
  26 #include "lib/vty.h"
  27 #include "lib/zclient.h"
  28
  29 #include "vrrp.h"
  30 #include "vrrp_debug.h"
  31 #include "vrrp_zebra.h"
  32
  33 #define VRRP_LOGPFX "[ZEBRA] "
  34
  35 static struct zclient *zclient = NULL;
  36
  37 static void vrrp_zebra_debug_if_state(struct interface *ifp, vrf_id_t vrf_id,
  38                                       const char *func)
  39 {
  40         DEBUGD(&vrrp_dbg_zebra,
  41                "%s: %s index %d(%u) flags %ld metric %d mtu %d operative %d",
  42                func, ifp->name, ifp->ifindex, vrf_id, (long)ifp->flags,
  43                ifp->metric, ifp->mtu, if_is_operative(ifp));
  44 }
  45
  46 static void vrrp_zebra_debug_if_dump_address(struct interface *ifp,
  47                                              const char *func)
  48 {
  49         struct connected *ifc;
  50         struct listnode *node;
  51
  52         DEBUGD(&vrrp_dbg_zebra, "%s: interface %s addresses:", func, ifp->name);
  53
  54         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
  55                 struct prefix *p = ifc->address;
  56
  57                 DEBUGD(&vrrp_dbg_zebra, "%s: interface %s address %s %s", func,
  58                        ifp->name, inet_ntoa(p->u.prefix4),
  59                        CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY) ? "secondary"
  60                                                                    : "primary");
  61         }
  62 }
  63
  64
  65 static void vrrp_zebra_connected(struct zclient *zclient)
  66 {
  67         zclient_send_reg_requests(zclient, VRF_DEFAULT);
  68 }
  69
  70 /* Router-id update message from zebra. */
  71 static int vrrp_router_id_update_zebra(int command, struct zclient *zclient,
  72                                        zebra_size_t length, vrf_id_t vrf_id)
  73 {
  74         struct prefix router_id;
  75
  76         zebra_router_id_update_read(zclient->ibuf, &router_id);
  77
  78         return 0;
  79 }
  80
  81 static int vrrp_zebra_if_add(int command, struct zclient *zclient,
  82                              zebra_size_t length, vrf_id_t vrf_id)
  83 {
  84         struct interface *ifp;
  85
  86         /*
  87          * zebra api adds/dels interfaces using the same call
  88          * interface_add_read below, see comments in lib/zclient.c
  89          */
  90         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  91
  92         if (!ifp)
  93                 return 0;
  94
  95         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
  96
  97         vrrp_if_add(ifp);
  98
  99         return 0;
 100 }
 101
 102 static int vrrp_zebra_if_del(int command, struct zclient *zclient,
 103                              zebra_size_t length, vrf_id_t vrf_id)
 104 {
 105         struct interface *ifp;
 106
 107         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 108
 109         if (!ifp)
 110                 return 0;
 111
 112         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
 113
 114         vrrp_if_del(ifp);
 115
 116         return 0;
 117 }
 118
 119 static int vrrp_zebra_if_state_up(int command, struct zclient *zclient,
 120                                   zebra_size_t length, vrf_id_t vrf_id)
 121 {
 122         struct interface *ifp;
 123
 124         /*
 125          * zebra api notifies interface up/down events by using the same call
 126          * zebra_interface_state_read below, see comments in lib/zclient.c ifp =
 127          * zebra_interface_state_read(zclient->ibuf, vrf_id);
 128          */
 129         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 130
 131         if (!ifp)
 132                 return 0;
 133
 134         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
 135
 136         vrrp_if_up(ifp);
 137
 138         return 0;
 139 }
 140
 141 static int vrrp_zebra_if_state_down(int command, struct zclient *zclient,
 142                                     zebra_size_t length, vrf_id_t vrf_id)
 143 {
 144         struct interface *ifp;
 145
 146         /*
 147          * zebra api notifies interface up/down events by using the same call
 148          * zebra_interface_state_read below, see comments in lib/zclient.c
 149          */
 150         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 151
 152         if (!ifp)
 153                 return 0;
 154
 155         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
 156
 157         vrrp_if_down(ifp);
 158
 159         return 0;
 160 }
 161
 162 static int vrrp_zebra_if_address_add(int command, struct zclient *zclient,
 163                                      zebra_size_t length, vrf_id_t vrf_id)
 164 {
 165         struct connected *c;
 166
 167         /*
 168          * zebra api notifies address adds/dels events by using the same call
 169          * interface_add_read below, see comments in lib/zclient.c
 170          *
 171          * zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD, ...)
 172          * will add address to interface list by calling
 173          * connected_add_by_prefix()
 174          */
 175         c = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
 176
 177         if (!c)
 178                 return 0;
 179
 180         vrrp_zebra_debug_if_state(c->ifp, vrf_id, __func__);
 181         vrrp_zebra_debug_if_dump_address(c->ifp, __func__);
 182
 183         vrrp_if_address_add(c->ifp);
 184
 185         return 0;
 186 }
 187
 188 static int vrrp_zebra_if_address_del(int command, struct zclient *client,
 189                                      zebra_size_t length, vrf_id_t vrf_id)
 190 {
 191         struct connected *c;
 192
 193         /*
 194          * zebra api notifies address adds/dels events by using the same call
 195          * interface_add_read below, see comments in lib/zclient.c
 196          *
 197          * zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE, ...)
 198          * will remove address from interface list by calling
 199          * connected_delete_by_prefix()
 200          */
 201         c = zebra_interface_address_read(command, client->ibuf, vrf_id);
 202
 203         if (!c)
 204                 return 0;
 205
 206         vrrp_zebra_debug_if_state(c->ifp, vrf_id, __func__);
 207         vrrp_zebra_debug_if_dump_address(c->ifp, __func__);
 208
 209         vrrp_if_address_del(c->ifp);
 210
 211         return 0;
 212 }
 213
 214 void vrrp_zebra_radv_set(struct vrrp_router *r, bool enable)
 215 {
 216         DEBUGD(&vrrp_dbg_zebra,
 217                VRRP_LOGPFX VRRP_LOGPFX_VRID
 218                "Requesting Zebra to turn router advertisements %s for %s",
 219                r->vr->vrid, enable ? "on" : "off", r->mvl_ifp->name);
 220
 221         zclient_send_interface_radv_req(zclient, VRF_DEFAULT, r->mvl_ifp,
 222                                         enable, VRRP_RADV_INT);
 223 }
 224
 225 int vrrp_zclient_send_interface_protodown(struct interface *ifp, bool down)
 226 {
 227         DEBUGD(&vrrp_dbg_zebra,
 228                VRRP_LOGPFX "Requesting Zebra to set %s protodown %s", ifp->name,
 229                down ? "on" : "off");
 230
 231         return zclient_send_interface_protodown(zclient, VRF_DEFAULT, ifp,
 232                                                 down);
 233 }
 234
 235 void vrrp_zebra_init(void)
 236 {
 237         /* Socket for receiving updates from Zebra daemon */
 238         zclient = zclient_new(master, &zclient_options_default);
 239
 240         zclient->zebra_connected = vrrp_zebra_connected;
 241         zclient->router_id_update = vrrp_router_id_update_zebra;
 242         zclient->interface_add = vrrp_zebra_if_add;
 243         zclient->interface_delete = vrrp_zebra_if_del;
 244         zclient->interface_up = vrrp_zebra_if_state_up;
 245         zclient->interface_down = vrrp_zebra_if_state_down;
 246         zclient->interface_address_add = vrrp_zebra_if_address_add;
 247         zclient->interface_address_delete = vrrp_zebra_if_address_del;
 248
 249         zclient_init(zclient, 0, 0, &vrrp_privs);
 250
 251         zlog_notice("%s: zclient socket initialized", __PRETTY_FUNCTION__);
 252 }