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1 | /* | |
2 | * RIPngd and zebra interface. | |
3 | * Copyright (C) 1998, 1999 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "command.h" | |
25 | #include "prefix.h" | |
26 | #include "agg_table.h" | |
27 | #include "stream.h" | |
28 | #include "memory.h" | |
29 | #include "routemap.h" | |
30 | #include "zclient.h" | |
31 | #include "log.h" | |
32 | ||
33 | #include "ripngd/ripngd.h" | |
34 | #include "ripngd/ripng_debug.h" | |
35 | ||
36 | /* All information about zebra. */ | |
37 | struct zclient *zclient = NULL; | |
38 | ||
39 | /* Send ECMP routes to zebra. */ | |
40 | static void ripng_zebra_ipv6_send(struct ripng *ripng, struct agg_node *rp, | |
41 | uint8_t cmd) | |
42 | { | |
43 | struct list *list = (struct list *)rp->info; | |
44 | struct zapi_route api; | |
45 | struct zapi_nexthop *api_nh; | |
46 | struct listnode *listnode = NULL; | |
47 | struct ripng_info *rinfo = NULL; | |
48 | int count = 0; | |
49 | const struct prefix *p = agg_node_get_prefix(rp); | |
50 | ||
51 | memset(&api, 0, sizeof(api)); | |
52 | api.vrf_id = ripng->vrf->vrf_id; | |
53 | api.type = ZEBRA_ROUTE_RIPNG; | |
54 | api.safi = SAFI_UNICAST; | |
55 | api.prefix = *p; | |
56 | ||
57 | SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); | |
58 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
59 | if (count >= MULTIPATH_NUM) | |
60 | break; | |
61 | api_nh = &api.nexthops[count]; | |
62 | api_nh->vrf_id = ripng->vrf->vrf_id; | |
63 | api_nh->gate.ipv6 = rinfo->nexthop; | |
64 | api_nh->ifindex = rinfo->ifindex; | |
65 | api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
66 | count++; | |
67 | if (cmd == ZEBRA_ROUTE_ADD) | |
68 | SET_FLAG(rinfo->flags, RIPNG_RTF_FIB); | |
69 | else | |
70 | UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB); | |
71 | } | |
72 | ||
73 | api.nexthop_num = count; | |
74 | ||
75 | rinfo = listgetdata(listhead(list)); | |
76 | ||
77 | SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); | |
78 | api.metric = rinfo->metric; | |
79 | ||
80 | if (rinfo->tag) { | |
81 | SET_FLAG(api.message, ZAPI_MESSAGE_TAG); | |
82 | api.tag = rinfo->tag; | |
83 | } | |
84 | ||
85 | zclient_route_send(cmd, zclient, &api); | |
86 | ||
87 | if (IS_RIPNG_DEBUG_ZEBRA) { | |
88 | if (ripng->ecmp) | |
89 | zlog_debug("%s: %pRN nexthops %d", | |
90 | (cmd == ZEBRA_ROUTE_ADD) | |
91 | ? "Install into zebra" | |
92 | : "Delete from zebra", | |
93 | rp, count); | |
94 | else | |
95 | zlog_debug("%s: %pRN", | |
96 | (cmd == ZEBRA_ROUTE_ADD) | |
97 | ? "Install into zebra" | |
98 | : "Delete from zebra", | |
99 | rp); | |
100 | } | |
101 | } | |
102 | ||
103 | /* Add/update ECMP routes to zebra. */ | |
104 | void ripng_zebra_ipv6_add(struct ripng *ripng, struct agg_node *rp) | |
105 | { | |
106 | ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_ADD); | |
107 | } | |
108 | ||
109 | /* Delete ECMP routes from zebra. */ | |
110 | void ripng_zebra_ipv6_delete(struct ripng *ripng, struct agg_node *rp) | |
111 | { | |
112 | ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_DELETE); | |
113 | } | |
114 | ||
115 | /* Zebra route add and delete treatment. */ | |
116 | static int ripng_zebra_read_route(ZAPI_CALLBACK_ARGS) | |
117 | { | |
118 | struct ripng *ripng; | |
119 | struct zapi_route api; | |
120 | struct in6_addr nexthop; | |
121 | unsigned long ifindex; | |
122 | ||
123 | ripng = ripng_lookup_by_vrf_id(vrf_id); | |
124 | if (!ripng) | |
125 | return 0; | |
126 | ||
127 | if (zapi_route_decode(zclient->ibuf, &api) < 0) | |
128 | return -1; | |
129 | ||
130 | /* we completely ignore srcdest routes for now. */ | |
131 | if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX)) | |
132 | return 0; | |
133 | ||
134 | if (IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6)) | |
135 | return 0; | |
136 | ||
137 | nexthop = api.nexthops[0].gate.ipv6; | |
138 | ifindex = api.nexthops[0].ifindex; | |
139 | ||
140 | if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) | |
141 | ripng_redistribute_add(ripng, api.type, | |
142 | RIPNG_ROUTE_REDISTRIBUTE, | |
143 | (struct prefix_ipv6 *)&api.prefix, | |
144 | ifindex, &nexthop, api.tag); | |
145 | else | |
146 | ripng_redistribute_delete( | |
147 | ripng, api.type, RIPNG_ROUTE_REDISTRIBUTE, | |
148 | (struct prefix_ipv6 *)&api.prefix, ifindex); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | void ripng_redistribute_conf_update(struct ripng *ripng, int type) | |
154 | { | |
155 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, | |
156 | type, 0, ripng->vrf->vrf_id); | |
157 | } | |
158 | ||
159 | void ripng_redistribute_conf_delete(struct ripng *ripng, int type) | |
160 | { | |
161 | if (zclient->sock > 0) | |
162 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, | |
163 | AFI_IP6, type, 0, ripng->vrf->vrf_id); | |
164 | ||
165 | ripng_redistribute_withdraw(ripng, type); | |
166 | } | |
167 | ||
168 | int ripng_redistribute_check(struct ripng *ripng, int type) | |
169 | { | |
170 | return ripng->redist[type].enabled; | |
171 | } | |
172 | ||
173 | void ripng_redistribute_enable(struct ripng *ripng) | |
174 | { | |
175 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
176 | if (!ripng_redistribute_check(ripng, i)) | |
177 | continue; | |
178 | ||
179 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, | |
180 | AFI_IP6, i, 0, ripng->vrf->vrf_id); | |
181 | } | |
182 | } | |
183 | ||
184 | void ripng_redistribute_disable(struct ripng *ripng) | |
185 | { | |
186 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
187 | if (!ripng_redistribute_check(ripng, i)) | |
188 | continue; | |
189 | ||
190 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, | |
191 | AFI_IP6, i, 0, ripng->vrf->vrf_id); | |
192 | } | |
193 | } | |
194 | ||
195 | void ripng_redistribute_write(struct vty *vty, struct ripng *ripng) | |
196 | { | |
197 | int i; | |
198 | ||
199 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
200 | if (i == zclient->redist_default | |
201 | || !ripng_redistribute_check(ripng, i)) | |
202 | continue; | |
203 | ||
204 | vty_out(vty, " %s", zebra_route_string(i)); | |
205 | } | |
206 | } | |
207 | ||
208 | void ripng_zebra_vrf_register(struct vrf *vrf) | |
209 | { | |
210 | if (vrf->vrf_id == VRF_DEFAULT) | |
211 | return; | |
212 | ||
213 | if (IS_RIPNG_DEBUG_EVENT) | |
214 | zlog_debug("%s: register VRF %s(%u) to zebra", __func__, | |
215 | vrf->name, vrf->vrf_id); | |
216 | ||
217 | zclient_send_reg_requests(zclient, vrf->vrf_id); | |
218 | } | |
219 | ||
220 | void ripng_zebra_vrf_deregister(struct vrf *vrf) | |
221 | { | |
222 | if (vrf->vrf_id == VRF_DEFAULT) | |
223 | return; | |
224 | ||
225 | if (IS_RIPNG_DEBUG_EVENT) | |
226 | zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__, | |
227 | vrf->name, vrf->vrf_id); | |
228 | ||
229 | zclient_send_dereg_requests(zclient, vrf->vrf_id); | |
230 | } | |
231 | ||
232 | static void ripng_zebra_connected(struct zclient *zclient) | |
233 | { | |
234 | zclient_send_reg_requests(zclient, VRF_DEFAULT); | |
235 | } | |
236 | ||
237 | static zclient_handler *const ripng_handlers[] = { | |
238 | [ZEBRA_INTERFACE_ADDRESS_ADD] = ripng_interface_address_add, | |
239 | [ZEBRA_INTERFACE_ADDRESS_DELETE] = ripng_interface_address_delete, | |
240 | [ZEBRA_INTERFACE_VRF_UPDATE] = ripng_interface_vrf_update, | |
241 | [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = ripng_zebra_read_route, | |
242 | [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ripng_zebra_read_route, | |
243 | }; | |
244 | ||
245 | /* Initialize zebra structure and it's commands. */ | |
246 | void zebra_init(struct thread_master *master) | |
247 | { | |
248 | /* Allocate zebra structure. */ | |
249 | zclient = zclient_new(master, &zclient_options_default, ripng_handlers, | |
250 | array_size(ripng_handlers)); | |
251 | zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs); | |
252 | ||
253 | zclient->zebra_connected = ripng_zebra_connected; | |
254 | } | |
255 | ||
256 | void ripng_zebra_stop(void) | |
257 | { | |
258 | zclient_stop(zclient); | |
259 | zclient_free(zclient); | |
260 | } |