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;
  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         if_set_index(ifp, IFINDEX_INTERNAL);
 117
 118         return 0;
 119 }
 120
 121 static int vrrp_zebra_if_state_up(int command, struct zclient *zclient,
 122                                   zebra_size_t length, vrf_id_t vrf_id)
 123 {
 124         struct interface *ifp;
 125
 126         /*
 127          * zebra api notifies interface up/down events by using the same call
 128          * zebra_interface_state_read below, see comments in lib/zclient.c ifp =
 129          * zebra_interface_state_read(zclient->ibuf, vrf_id);
 130          */
 131         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 132
 133         if (!ifp)
 134                 return 0;
 135
 136         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
 137
 138         vrrp_if_up(ifp);
 139
 140         return 0;
 141 }
 142
 143 static int vrrp_zebra_if_state_down(int command, struct zclient *zclient,
 144                                     zebra_size_t length, vrf_id_t vrf_id)
 145 {
 146         struct interface *ifp;
 147
 148         /*
 149          * zebra api notifies interface up/down events by using the same call
 150          * zebra_interface_state_read below, see comments in lib/zclient.c
 151          */
 152         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 153
 154         if (!ifp)
 155                 return 0;
 156
 157         vrrp_zebra_debug_if_state(ifp, vrf_id, __func__);
 158
 159         vrrp_if_down(ifp);
 160
 161         return 0;
 162 }
 163
 164 static int vrrp_zebra_if_address_add(int command, struct zclient *zclient,
 165                                      zebra_size_t length, vrf_id_t vrf_id)
 166 {
 167         struct connected *c;
 168
 169         /*
 170          * zebra api notifies address adds/dels events by using the same call
 171          * interface_add_read below, see comments in lib/zclient.c
 172          *
 173          * zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD, ...)
 174          * will add address to interface list by calling
 175          * connected_add_by_prefix()
 176          */
 177         c = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
 178
 179         if (!c)
 180                 return 0;
 181
 182         vrrp_zebra_debug_if_state(c->ifp, vrf_id, __func__);
 183         vrrp_zebra_debug_if_dump_address(c->ifp, __func__);
 184
 185         vrrp_if_address_add(c->ifp);
 186
 187         return 0;
 188 }
 189
 190 static int vrrp_zebra_if_address_del(int command, struct zclient *client,
 191                                      zebra_size_t length, vrf_id_t vrf_id)
 192 {
 193         struct connected *c;
 194
 195         /*
 196          * zebra api notifies address adds/dels events by using the same call
 197          * interface_add_read below, see comments in lib/zclient.c
 198          *
 199          * zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE, ...)
 200          * will remove address from interface list by calling
 201          * connected_delete_by_prefix()
 202          */
 203         c = zebra_interface_address_read(command, client->ibuf, vrf_id);
 204
 205         if (!c)
 206                 return 0;
 207
 208         vrrp_zebra_debug_if_state(c->ifp, vrf_id, __func__);
 209         vrrp_zebra_debug_if_dump_address(c->ifp, __func__);
 210
 211         vrrp_if_address_del(c->ifp);
 212
 213         return 0;
 214 }
 215
 216 void vrrp_zebra_radv_set(struct vrrp_router *r, bool enable)
 217 {
 218         DEBUGD(&vrrp_dbg_zebra,
 219                VRRP_LOGPFX VRRP_LOGPFX_VRID
 220                "Requesting Zebra to turn router advertisements %s for %s",
 221                r->vr->vrid, enable ? "on" : "off", r->mvl_ifp->name);
 222
 223         zclient_send_interface_radv_req(zclient, VRF_DEFAULT, r->mvl_ifp,
 224                                         enable, VRRP_RADV_INT);
 225 }
 226
 227 int vrrp_zclient_send_interface_protodown(struct interface *ifp, bool down)
 228 {
 229         DEBUGD(&vrrp_dbg_zebra,
 230                VRRP_LOGPFX "Requesting Zebra to set %s protodown %s", ifp->name,
 231                down ? "on" : "off");
 232
 233         return zclient_send_interface_protodown(zclient, VRF_DEFAULT, ifp,
 234                                                 down);
 235 }
 236
 237 void vrrp_zebra_init(void)
 238 {
 239         /* Socket for receiving updates from Zebra daemon */
 240         zclient = zclient_new(master, &zclient_options_default);
 241
 242         zclient->zebra_connected = vrrp_zebra_connected;
 243         zclient->router_id_update = vrrp_router_id_update_zebra;
 244         zclient->interface_add = vrrp_zebra_if_add;
 245         zclient->interface_delete = vrrp_zebra_if_del;
 246         zclient->interface_up = vrrp_zebra_if_state_up;
 247         zclient->interface_down = vrrp_zebra_if_state_down;
 248         zclient->interface_address_add = vrrp_zebra_if_address_add;
 249         zclient->interface_address_delete = vrrp_zebra_if_address_del;
 250
 251         zclient_init(zclient, ZEBRA_ROUTE_VRRP, 0, &vrrp_privs);
 252
 253         zlog_notice("%s: zclient socket initialized", __PRETTY_FUNCTION__);
 254 }