2 * EIGRP Network Related Functions.
3 * Copyright (C) 2013-2014
11 * This file is part of GNU Zebra.
13 * GNU Zebra is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2, or (at your option) any
18 * GNU Zebra is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; see the file COPYING; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 #include "sockunion.h"
40 #include "lib_errors.h"
42 #include "eigrpd/eigrp_structs.h"
43 #include "eigrpd/eigrpd.h"
44 #include "eigrpd/eigrp_interface.h"
45 #include "eigrpd/eigrp_neighbor.h"
46 #include "eigrpd/eigrp_packet.h"
47 #include "eigrpd/eigrp_zebra.h"
48 #include "eigrpd/eigrp_vty.h"
49 #include "eigrpd/eigrp_network.h"
51 static int eigrp_network_match_iface(const struct prefix
*connected_prefix
,
52 const struct prefix
*prefix
);
53 static void eigrp_network_run_interface(struct eigrp
*, struct prefix
*,
56 int eigrp_sock_init(struct vrf
*vrf
)
67 frr_with_privs(&eigrpd_privs
) {
68 eigrp_sock
= vrf_socket(
69 AF_INET
, SOCK_RAW
, IPPROTO_EIGRPIGP
, vrf
->vrf_id
,
70 vrf
->vrf_id
!= VRF_DEFAULT
? vrf
->name
: NULL
);
72 zlog_err("eigrp_read_sock_init: socket: %s",
73 safe_strerror(errno
));
78 /* we will include IP header with packet */
79 ret
= setsockopt(eigrp_sock
, IPPROTO_IP
, IP_HDRINCL
, &hincl
,
82 zlog_warn("Can't set IP_HDRINCL option for fd %d: %s",
83 eigrp_sock
, safe_strerror(errno
));
85 #elif defined(IPTOS_PREC_INTERNETCONTROL)
86 #warning "IP_HDRINCL not available on this system"
87 #warning "using IPTOS_PREC_INTERNETCONTROL"
88 ret
= setsockopt_ipv4_tos(eigrp_sock
,
89 IPTOS_PREC_INTERNETCONTROL
);
91 zlog_warn("can't set sockopt IP_TOS %d to socket %d: %s",
92 tos
, eigrp_sock
, safe_strerror(errno
));
93 close(eigrp_sock
); /* Prevent sd leak. */
96 #else /* !IPTOS_PREC_INTERNETCONTROL */
97 #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
98 zlog_warn("IP_HDRINCL option not available");
99 #endif /* IP_HDRINCL */
101 ret
= setsockopt_ifindex(AF_INET
, eigrp_sock
, 1);
103 zlog_warn("Can't set pktinfo option for fd %d",
110 void eigrp_adjust_sndbuflen(struct eigrp
*eigrp
, unsigned int buflen
)
113 /* Check if any work has to be done at all. */
114 if (eigrp
->maxsndbuflen
>= buflen
)
117 /* Now we try to set SO_SNDBUF to what our caller has requested
118 * (the MTU of a newly added interface). However, if the OS has
119 * truncated the actual buffer size to somewhat less size, try
120 * to detect it and update our records appropriately. The OS
121 * may allocate more buffer space, than requested, this isn't
124 setsockopt_so_sendbuf(eigrp
->fd
, buflen
);
125 newbuflen
= getsockopt_so_sendbuf(eigrp
->fd
);
126 if (newbuflen
< 0 || newbuflen
< (int)buflen
)
127 zlog_warn("%s: tried to set SO_SNDBUF to %u, but got %d",
128 __func__
, buflen
, newbuflen
);
130 eigrp
->maxsndbuflen
= (unsigned int)newbuflen
;
132 zlog_warn("%s: failed to get SO_SNDBUF", __func__
);
135 int eigrp_if_ipmulticast(struct eigrp
*top
, struct prefix
*p
,
136 unsigned int ifindex
)
144 /* Prevent receiving self-origined multicast packets. */
145 ret
= setsockopt(top
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, (void *)&val
,
149 "can't setsockopt IP_MULTICAST_LOOP (0) for fd %d: %s",
150 top
->fd
, safe_strerror(errno
));
152 /* Explicitly set multicast ttl to 1 -- endo. */
154 ret
= setsockopt(top
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&val
,
157 zlog_warn("can't setsockopt IP_MULTICAST_TTL (1) for fd %d: %s",
158 top
->fd
, safe_strerror(errno
));
160 ret
= setsockopt_ipv4_multicast_if(top
->fd
, p
->u
.prefix4
, ifindex
);
163 "can't setsockopt IP_MULTICAST_IF (fd %d, addr %s, "
165 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
166 safe_strerror(errno
));
171 /* Join to the EIGRP multicast group. */
172 int eigrp_if_add_allspfrouters(struct eigrp
*top
, struct prefix
*p
,
173 unsigned int ifindex
)
177 ret
= setsockopt_ipv4_multicast(
178 top
->fd
, IP_ADD_MEMBERSHIP
, p
->u
.prefix4
,
179 htonl(EIGRP_MULTICAST_ADDRESS
), ifindex
);
182 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
183 "ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
184 "on # of multicast group memberships has been exceeded?",
185 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
186 safe_strerror(errno
));
188 zlog_debug("interface %s [%u] join EIGRP Multicast group.",
189 inet_ntoa(p
->u
.prefix4
), ifindex
);
194 int eigrp_if_drop_allspfrouters(struct eigrp
*top
, struct prefix
*p
,
195 unsigned int ifindex
)
199 ret
= setsockopt_ipv4_multicast(
200 top
->fd
, IP_DROP_MEMBERSHIP
, p
->u
.prefix4
,
201 htonl(EIGRP_MULTICAST_ADDRESS
), ifindex
);
204 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
205 "ifindex %u, AllSPFRouters): %s",
206 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
207 safe_strerror(errno
));
209 zlog_debug("interface %s [%u] leave EIGRP Multicast group.",
210 inet_ntoa(p
->u
.prefix4
), ifindex
);
215 int eigrp_network_set(struct eigrp
*eigrp
, struct prefix
*p
)
217 struct vrf
*vrf
= vrf_lookup_by_id(eigrp
->vrf_id
);
218 struct route_node
*rn
;
219 struct interface
*ifp
;
221 rn
= route_node_get(eigrp
->networks
, (struct prefix
*)p
);
223 /* There is already same network statement. */
224 route_unlock_node(rn
);
228 struct prefix
*pref
= prefix_new();
229 PREFIX_COPY_IPV4(pref
, p
);
230 rn
->info
= (void *)pref
;
232 /* Schedule Router ID Update. */
233 if (eigrp
->router_id
.s_addr
== INADDR_ANY
)
234 eigrp_router_id_update(eigrp
);
235 /* Run network config now. */
236 /* Get target interface. */
237 FOR_ALL_INTERFACES (vrf
, ifp
) {
238 zlog_debug("Setting up %s", ifp
->name
);
239 eigrp_network_run_interface(eigrp
, p
, ifp
);
244 /* Check whether interface matches given network
245 * returns: 1, true. 0, false
247 static int eigrp_network_match_iface(const struct prefix
*co_prefix
,
248 const struct prefix
*net
)
250 /* new approach: more elegant and conceptually clean */
251 return prefix_match_network_statement(net
, co_prefix
);
254 static void eigrp_network_run_interface(struct eigrp
*eigrp
, struct prefix
*p
,
255 struct interface
*ifp
)
257 struct eigrp_interface
*ei
;
258 struct listnode
*cnode
;
259 struct connected
*co
;
261 /* if interface prefix is match specified prefix,
262 then create socket and join multicast group. */
263 for (ALL_LIST_ELEMENTS_RO(ifp
->connected
, cnode
, co
)) {
265 if (CHECK_FLAG(co
->flags
, ZEBRA_IFA_SECONDARY
))
268 if (p
->family
== co
->address
->family
&& !ifp
->info
269 && eigrp_network_match_iface(co
->address
, p
)) {
271 ei
= eigrp_if_new(eigrp
, ifp
, co
->address
);
273 /* Relate eigrp interface to eigrp instance. */
276 /* if router_id is not configured, dont bring up
278 * eigrp_router_id_update() will call eigrp_if_update
279 * whenever r-id is configured instead.
281 if (if_is_operative(ifp
))
287 void eigrp_if_update(struct interface
*ifp
)
289 struct listnode
*node
, *nnode
;
290 struct route_node
*rn
;
294 * In the event there are multiple eigrp autonymnous systems running,
295 * we need to check eac one and add the interface as approperate
297 for (ALL_LIST_ELEMENTS(eigrp_om
->eigrp
, node
, nnode
, eigrp
)) {
298 if (ifp
->vrf_id
!= eigrp
->vrf_id
)
301 /* EIGRP must be on and Router-ID must be configured. */
302 if (eigrp
->router_id
.s_addr
== 0)
305 /* Run each network for this interface. */
306 for (rn
= route_top(eigrp
->networks
); rn
; rn
= route_next(rn
))
307 if (rn
->info
!= NULL
) {
308 eigrp_network_run_interface(eigrp
, &rn
->p
, ifp
);
313 int eigrp_network_unset(struct eigrp
*eigrp
, struct prefix
*p
)
315 struct route_node
*rn
;
316 struct listnode
*node
, *nnode
;
317 struct eigrp_interface
*ei
;
320 rn
= route_node_lookup(eigrp
->networks
, p
);
325 route_unlock_node(rn
);
327 if (!IPV4_ADDR_SAME(&pref
->u
.prefix4
, &p
->u
.prefix4
))
330 prefix_ipv4_free((struct prefix_ipv4
**)&rn
->info
);
331 route_unlock_node(rn
); /* initial reference */
333 /* Find interfaces that not configured already. */
334 for (ALL_LIST_ELEMENTS(eigrp
->eiflist
, node
, nnode
, ei
)) {
337 for (rn
= route_top(eigrp
->networks
); rn
; rn
= route_next(rn
)) {
338 if (rn
->info
== NULL
)
341 if (eigrp_network_match_iface(&ei
->address
, &rn
->p
)) {
343 route_unlock_node(rn
);
349 eigrp_if_free(ei
, INTERFACE_DOWN_BY_VTY
);
356 uint32_t eigrp_calculate_metrics(struct eigrp
*eigrp
,
357 struct eigrp_metrics metric
)
359 uint64_t temp_metric
;
362 if (metric
.delay
== EIGRP_MAX_METRIC
)
363 return EIGRP_MAX_METRIC
;
366 // {K1*BW+[(K2*BW)/(256-load)]+(K3*delay)}*{K5/(reliability+K4)}
368 if (eigrp
->k_values
[0])
369 temp_metric
+= (eigrp
->k_values
[0] * metric
.bandwidth
);
370 if (eigrp
->k_values
[1])
371 temp_metric
+= ((eigrp
->k_values
[1] * metric
.bandwidth
)
372 / (256 - metric
.load
));
373 if (eigrp
->k_values
[2])
374 temp_metric
+= (eigrp
->k_values
[2] * metric
.delay
);
375 if (eigrp
->k_values
[3] && !eigrp
->k_values
[4])
376 temp_metric
*= eigrp
->k_values
[3];
377 if (!eigrp
->k_values
[3] && eigrp
->k_values
[4])
378 temp_metric
*= (eigrp
->k_values
[4] / metric
.reliability
);
379 if (eigrp
->k_values
[3] && eigrp
->k_values
[4])
380 temp_metric
*= ((eigrp
->k_values
[4] / metric
.reliability
)
381 + eigrp
->k_values
[3]);
383 if (temp_metric
<= EIGRP_MAX_METRIC
)
384 return (uint32_t)temp_metric
;
386 return EIGRP_MAX_METRIC
;
389 uint32_t eigrp_calculate_total_metrics(struct eigrp
*eigrp
,
390 struct eigrp_nexthop_entry
*entry
)
392 struct eigrp_interface
*ei
= entry
->ei
;
394 entry
->total_metric
= entry
->reported_metric
;
395 uint64_t temp_delay
=
396 (uint64_t)entry
->total_metric
.delay
397 + (uint64_t)eigrp_delay_to_scaled(ei
->params
.delay
);
398 entry
->total_metric
.delay
= temp_delay
> EIGRP_MAX_METRIC
400 : (uint32_t)temp_delay
;
402 uint32_t bw
= eigrp_bandwidth_to_scaled(ei
->params
.bandwidth
);
403 entry
->total_metric
.bandwidth
= entry
->total_metric
.bandwidth
> bw
405 : entry
->total_metric
.bandwidth
;
407 return eigrp_calculate_metrics(eigrp
, entry
->total_metric
);
410 uint8_t eigrp_metrics_is_same(struct eigrp_metrics metric1
,
411 struct eigrp_metrics metric2
)
413 if ((metric1
.bandwidth
== metric2
.bandwidth
)
414 && (metric1
.delay
== metric2
.delay
)
415 && (metric1
.hop_count
== metric2
.hop_count
)
416 && (metric1
.load
== metric2
.load
)
417 && (metric1
.reliability
== metric2
.reliability
)
418 && (metric1
.mtu
[0] == metric2
.mtu
[0])
419 && (metric1
.mtu
[1] == metric2
.mtu
[1])
420 && (metric1
.mtu
[2] == metric2
.mtu
[2]))
423 return 0; // if different
426 void eigrp_external_routes_refresh(struct eigrp
*eigrp
, int type
)