[mirror_frr.git] / zebra / connected.c

/*
 * Address linked list routine.
 * Copyright (C) 1997, 98 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "prefix.h"
#include "linklist.h"
#include "if.h"
#include "table.h"
#include "rib.h"
#include "table.h"
#include "log.h"
#include "memory.h"
#include "zebra_memory.h"

#include "vty.h"
#include "zebra/debug.h"
#include "zebra/zserv.h"
#include "zebra/redistribute.h"
#include "zebra/interface.h"
#include "zebra/connected.h"
#include "zebra/rtadv.h"
#include "zebra/zebra_mpls.h"
#include "zebra/debug.h"

/* communicate the withdrawal of a connected address */
static void connected_withdraw(struct connected *ifc)
{
	if (!ifc)
		return;

	/* Update interface address information to protocol daemon. */
	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
		zebra_interface_address_delete_update(ifc->ifp, ifc);

		if (ifc->address->family == AF_INET)
			if_subnet_delete(ifc->ifp, ifc);

		connected_down(ifc->ifp, ifc);

		UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
	}

	/* The address is not in the kernel anymore, so clear the flag */
	UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
		listnode_delete(ifc->ifp->connected, ifc);
		connected_free(ifc);
	}
}

static void connected_announce(struct interface *ifp, struct connected *ifc)
{
	if (!ifc)
		return;

	if (!if_is_loopback(ifp) && ifc->address->family == AF_INET &&
	    !IS_ZEBRA_IF_VRF(ifp)) {
		if (ifc->address->prefixlen == 32)
			SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
		else
			UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
	}

	listnode_add(ifp->connected, ifc);

	/* Update interface address information to protocol daemon. */
	if (ifc->address->family == AF_INET)
		if_subnet_add(ifp, ifc);

	zebra_interface_address_add_update(ifp, ifc);

	if (if_is_operative(ifp)) {
		connected_up(ifp, ifc);
	}
}

/* If same interface address is already exist... */
struct connected *connected_check(struct interface *ifp,
				  union prefixconstptr pu)
{
	const struct prefix *p = pu.p;
	struct connected *ifc;
	struct listnode *node;

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
		if (prefix_same(ifc->address, p))
			return ifc;

	return NULL;
}

/* same, but with peer address */
struct connected *connected_check_ptp(struct interface *ifp,
				      union prefixconstptr pu,
				      union prefixconstptr du)
{
	const struct prefix *p = pu.p;
	const struct prefix *d = du.p;
	struct connected *ifc;
	struct listnode *node;

	/* ignore broadcast addresses */
	if (p->prefixlen != IPV4_MAX_PREFIXLEN)
		d = NULL;

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
		if (!prefix_same(ifc->address, p))
			continue;
		if (!CONNECTED_PEER(ifc) && !d)
			return ifc;
		if (CONNECTED_PEER(ifc) && d
		    && prefix_same(ifc->destination, d))
			return ifc;
	}

	return NULL;
}

/* Check if two ifc's describe the same address in the same state */
static int connected_same(struct connected *ifc1, struct connected *ifc2)
{
	if (ifc1->ifp != ifc2->ifp)
		return 0;

	if (ifc1->destination)
		if (!ifc2->destination)
			return 0;
	if (ifc2->destination)
		if (!ifc1->destination)
			return 0;

	if (ifc1->destination && ifc2->destination)
		if (!prefix_same(ifc1->destination, ifc2->destination))
			return 0;

	if (ifc1->flags != ifc2->flags)
		return 0;

	if (ifc1->conf != ifc2->conf)
		return 0;

	return 1;
}

/* Handle changes to addresses and send the neccesary announcements
 * to clients. */
static void connected_update(struct interface *ifp, struct connected *ifc)
{
	struct connected *current;

	/* Check same connected route. */
	current = connected_check_ptp(ifp, ifc->address, ifc->destination);
	if (current) {
		if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
			SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);

		/* Avoid spurious withdraws, this might be just the kernel
		 * 'reflecting'
		 * back an address we have already added.
		 */
		if (connected_same(current, ifc)) {
			/* nothing to do */
			connected_free(ifc);
			return;
		}

		/* Clear the configured flag on the old ifc, so it will be freed
		 * by
		 * connected withdraw. */
		UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
		connected_withdraw(
			current); /* implicit withdraw - freebsd does this */
	}

	/* If the connected is new or has changed, announce it, if it is usable
	 */
	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
		connected_announce(ifp, ifc);
}

/* Called from if_up(). */
void connected_up(struct interface *ifp, struct connected *ifc)
{
	afi_t afi;
	struct prefix p;
	struct nexthop nh = {
		.type = NEXTHOP_TYPE_IFINDEX,
		.ifindex = ifp->ifindex,
		.vrf_id = ifp->vrf_id,
	};

	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
		return;

	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));

	/* Apply mask to the network. */
	apply_mask(&p);

	afi = family2afi(p.family);

	switch (afi) {
	case AFI_IP:
		/*
		 * In case of connected address is 0.0.0.0/0 we treat it tunnel
		 * address.
		 */
		if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
			return;
		break;
	case AFI_IP6:
#ifndef LINUX
		/* XXX: It is already done by rib_bogus_ipv6 within rib_add */
		if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
			return;
#endif
		break;
	default:
		zlog_warn("Received unknown AFI: %s", afi2str(afi));
		return;
		break;
	}

	rib_add(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
		NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);

	rib_add(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
		NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);

	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
		char buf[PREFIX_STRLEN];

		zlog_debug(
			"%u: IF %s address %s add/up, scheduling RIB processing",
			ifp->vrf_id, ifp->name,
			prefix2str(&p, buf, sizeof(buf)));
	}
	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);

	/* Schedule LSP forwarding entries for processing, if appropriate. */
	if (ifp->vrf_id == VRF_DEFAULT) {
		if (IS_ZEBRA_DEBUG_MPLS) {
			char buf[PREFIX_STRLEN];

			zlog_debug(
				"%u: IF %s IP %s address add/up, scheduling MPLS processing",
				ifp->vrf_id, ifp->name,
				prefix2str(&p, buf, sizeof(buf)));
		}
		mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
	}
}

/* Add connected IPv4 route to the interface. */
void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
			uint8_t prefixlen, struct in_addr *broad,
			const char *label)
{
	struct prefix_ipv4 *p;
	struct connected *ifc;

	if (ipv4_martian(addr))
		return;

	/* Make connected structure. */
	ifc = connected_new();
	ifc->ifp = ifp;
	ifc->flags = flags;
	/* If we get a notification from the kernel,
	 * we can safely assume the address is known to the kernel */
	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

	/* Allocate new connected address. */
	p = prefix_ipv4_new();
	p->family = AF_INET;
	p->prefix = *addr;
	p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
							 : prefixlen;
	ifc->address = (struct prefix *)p;

	/* If there is broadcast or peer address. */
	if (broad) {
		p = prefix_ipv4_new();
		p->family = AF_INET;
		p->prefix = *broad;
		p->prefixlen = prefixlen;
		ifc->destination = (struct prefix *)p;

		/* validate the destination address */
		if (CONNECTED_PEER(ifc)) {
			if (IPV4_ADDR_SAME(addr, broad))
				zlog_warn(
					"warning: interface %s has same local and peer "
					"address %s, routing protocols may malfunction",
					ifp->name, inet_ntoa(*addr));
		} else {
			if (broad->s_addr
			    != ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
				char buf[2][INET_ADDRSTRLEN];
				struct in_addr bcalc;
				bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
								   prefixlen);
				zlog_warn(
					"warning: interface %s broadcast addr %s/%d != "
					"calculated %s, routing protocols may malfunction",
					ifp->name,
					inet_ntop(AF_INET, broad, buf[0],
						  sizeof(buf[0])),
					prefixlen,
					inet_ntop(AF_INET, &bcalc, buf[1],
						  sizeof(buf[1])));
			}
		}

	} else {
		if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
			zlog_warn(
				"warning: %s called for interface %s "
				"with peer flag set, but no peer address supplied",
				__func__, ifp->name);
			UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
		}

		/* no broadcast or destination address was supplied */
		if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
			zlog_warn(
				"warning: PtP interface %s with addr %s/%d needs a "
				"peer address",
				ifp->name, inet_ntoa(*addr), prefixlen);
	}

	/* Label of this address. */
	if (label)
		ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);

	/* For all that I know an IPv4 address is always ready when we receive
	 * the notification. So it should be safe to set the REAL flag here. */
	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);

	connected_update(ifp, ifc);
}

void connected_down(struct interface *ifp, struct connected *ifc)
{
	afi_t afi;
	struct prefix p;
	struct nexthop nh = {
		.type = NEXTHOP_TYPE_IFINDEX,
		.ifindex = ifp->ifindex,
		.vrf_id = ifp->vrf_id,
	};

	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
		return;

	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));

	/* Apply mask to the network. */
	apply_mask(&p);

	afi = family2afi(p.family);

	switch (afi) {
	case AFI_IP:
		/*
		 * In case of connected address is 0.0.0.0/0 we treat it tunnel
		 *  address.
		 */
		if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
			return;
		break;
	case AFI_IP6:
		if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
			return;
		break;
	default:
		zlog_info("Unknown AFI: %s", afi2str(afi));
		break;
	}

	/*
	 * Same logic as for connected_up(): push the changes into the
	 * head.
	 */
	rib_delete(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
		   &p, NULL, &nh, 0, 0, 0, false);

	rib_delete(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
		   &p, NULL, &nh, 0, 0, 0, false);

	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
		char buf[PREFIX_STRLEN];

		zlog_debug(
			"%u: IF %s IP %s address down, scheduling RIB processing",
			ifp->vrf_id, ifp->name,
			prefix2str(&p, buf, sizeof(buf)));
	}

	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);

	/* Schedule LSP forwarding entries for processing, if appropriate. */
	if (ifp->vrf_id == VRF_DEFAULT) {
		if (IS_ZEBRA_DEBUG_MPLS) {
			char buf[PREFIX_STRLEN];

			zlog_debug(
				"%u: IF %s IP %s address down, scheduling MPLS processing",
				ifp->vrf_id, ifp->name,
				prefix2str(&p, buf, sizeof(buf)));
		}
		mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
	}
}

static void connected_delete_helper(struct connected *ifc, struct prefix *p)
{
	struct interface *ifp;

	if (!ifc)
		return;
	ifp = ifc->ifp;

	connected_withdraw(ifc);

	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
		char buf[PREFIX_STRLEN];

		zlog_debug(
			"%u: IF %s IP %s address del, scheduling RIB processing",
			ifp->vrf_id, ifp->name,
			prefix2str(p, buf, sizeof(buf)));
	}
	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);

	/* Schedule LSP forwarding entries for processing, if appropriate. */
	if (ifp->vrf_id == VRF_DEFAULT) {
		if (IS_ZEBRA_DEBUG_MPLS) {
			char buf[PREFIX_STRLEN];

			zlog_debug(
				"%u: IF %s IP %s address delete, scheduling MPLS processing",
				ifp->vrf_id, ifp->name,
				prefix2str(p, buf, sizeof(buf)));
		}
		mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
	}
}

/* Delete connected IPv4 route to the interface. */
void connected_delete_ipv4(struct interface *ifp, int flags,
			   struct in_addr *addr, uint8_t prefixlen,
			   struct in_addr *broad)
{
	struct prefix p, d;
	struct connected *ifc;

	memset(&p, 0, sizeof(struct prefix));
	p.family = AF_INET;
	p.u.prefix4 = *addr;
	p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
							: prefixlen;

	if (broad) {
		memset(&d, 0, sizeof(struct prefix));
		d.family = AF_INET;
		d.u.prefix4 = *broad;
		d.prefixlen = prefixlen;
		ifc = connected_check_ptp(ifp, &p, &d);
	} else
		ifc = connected_check_ptp(ifp, &p, NULL);

	connected_delete_helper(ifc, &p);
}

/* Add connected IPv6 route to the interface. */
void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
			struct in6_addr *broad, uint8_t prefixlen,
			const char *label)
{
	struct prefix_ipv6 *p;
	struct connected *ifc;

	if (ipv6_martian(addr))
		return;

	/* Make connected structure. */
	ifc = connected_new();
	ifc->ifp = ifp;
	ifc->flags = flags;
	/* If we get a notification from the kernel,
	 * we can safely assume the address is known to the kernel */
	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

	/* Allocate new connected address. */
	p = prefix_ipv6_new();
	p->family = AF_INET6;
	IPV6_ADDR_COPY(&p->prefix, addr);
	p->prefixlen = prefixlen;
	ifc->address = (struct prefix *)p;

	if (broad) {
		p = prefix_ipv6_new();
		p->family = AF_INET6;
		IPV6_ADDR_COPY(&p->prefix, broad);
		p->prefixlen = prefixlen;
		ifc->destination = (struct prefix *)p;
	} else {
		if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
			zlog_warn("warning: %s called for interface %s with peer flag set, but no peer address supplied",
				  __func__, ifp->name);
			UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
		}
	}

	/* Label of this address. */
	if (label)
		ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);

	/* On Linux, we only get here when DAD is complete, therefore we can set
	 * ZEBRA_IFC_REAL.
	 *
	 * On BSD, there currently doesn't seem to be a way to check for
	 * completion of
	 * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
	 * although DAD
	 * might still be running.
	 */
	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
	connected_update(ifp, ifc);
}

void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
			   struct in6_addr *broad, uint8_t prefixlen)
{
	struct prefix p, d;
	struct connected *ifc;

	memset(&p, 0, sizeof(struct prefix));
	p.family = AF_INET6;
	memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
	p.prefixlen = prefixlen;

	if (broad) {
		memset(&d, 0, sizeof(struct prefix));
		d.family = AF_INET6;
		IPV6_ADDR_COPY(&d.u.prefix6, broad);
		d.prefixlen = prefixlen;
		ifc = connected_check_ptp(ifp, &p, &d);
	} else
		ifc = connected_check_ptp(ifp, &p, NULL);

	connected_delete_helper(ifc, &p);
}

int connected_is_unnumbered(struct interface *ifp)
{
	struct connected *connected;
	struct listnode *node;

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
		if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
		    && connected->address->family == AF_INET)
			return CHECK_FLAG(connected->flags,
					  ZEBRA_IFA_UNNUMBERED);
	}
	return 0;
}
Commit	Line	Data
718e3744	1	/*
	2	* Address linked list routine.
	3	* Copyright (C) 1997, 98 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	*
896014f4 DL	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
718e3744	20	*/
	21
	22	#include <zebra.h>
	23
	24	#include "prefix.h"
	25	#include "linklist.h"
	26	#include "if.h"
	27	#include "table.h"
	28	#include "rib.h"
	29	#include "table.h"
	30	#include "log.h"
0752ef0b	31	#include "memory.h"
4a1ab8e4	32	#include "zebra_memory.h"
718e3744	33
82f97584	34	#include "vty.h"
b84c7253	35	#include "zebra/debug.h"
718e3744	36	#include "zebra/zserv.h"
718e3744	37	#include "zebra/redistribute.h"
eef1fe11	38	#include "zebra/interface.h"
a1ac18c4	39	#include "zebra/connected.h"
b6120505	40	#include "zebra/rtadv.h"
40c7bdb0	41	#include "zebra/zebra_mpls.h"
939fba27	42	#include "zebra/debug.h"
6b0655a2	43
02b4805f	44	/* communicate the withdrawal of a connected address */
d62a17ae	45	static void connected_withdraw(struct connected *ifc)
ca16218d	46	{
d62a17ae	47	if (!ifc)
d62a17ae	48	return;
ca16218d	49
d62a17ae	50	/* Update interface address information to protocol daemon. */
	51	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
	52	zebra_interface_address_delete_update(ifc->ifp, ifc);
ca16218d	53
d62a17ae	54	if (ifc->address->family == AF_INET)
d62a17ae	55	if_subnet_delete(ifc->ifp, ifc);
9db047fc	56
11461c63	57	connected_down(ifc->ifp, ifc);
ca16218d	58
d62a17ae	59	UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
d62a17ae	60	}
ca16218d	61
d62a17ae	62	/* The address is not in the kernel anymore, so clear the flag */
d62a17ae	63	UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
f7f740fe	64
d62a17ae	65	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
	66	listnode_delete(ifc->ifp->connected, ifc);
	67	connected_free(ifc);
	68	}
ca16218d	69	}
ca16218d	70
d62a17ae	71	static void connected_announce(struct interface ifp, struct connected ifc)
ca16218d	72	{
d62a17ae	73	if (!ifc)
	74	return;
	75
b0fa6f6a CS	76	if (!if_is_loopback(ifp) && ifc->address->family == AF_INET &&
b0fa6f6a CS	77	!IS_ZEBRA_IF_VRF(ifp)) {
d62a17ae	78	if (ifc->address->prefixlen == 32)
	79	SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
	80	else
	81	UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
	82	}
	83
	84	listnode_add(ifp->connected, ifc);
	85
	86	/* Update interface address information to protocol daemon. */
	87	if (ifc->address->family == AF_INET)
	88	if_subnet_add(ifp, ifc);
	89
	90	zebra_interface_address_add_update(ifp, ifc);
	91
	92	if (if_is_operative(ifp)) {
ae87977c	93	connected_up(ifp, ifc);
d62a17ae	94	}
ca16218d	95	}
6b0655a2	96
718e3744	97	/* If same interface address is already exist... */
abffde07 DL	98	struct connected connected_check(struct interface ifp,
abffde07 DL	99	union prefixconstptr pu)
718e3744	100	{
abffde07	101	const struct prefix *p = pu.p;
d62a17ae	102	struct connected *ifc;
d62a17ae	103	struct listnode *node;
718e3744	104
d62a17ae	105	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
	106	if (prefix_same(ifc->address, p))
	107	return ifc;
718e3744	108
d62a17ae	109	return NULL;
718e3744	110	}
718e3744	111
abffde07 DL	112	/* same, but with peer address */
	113	struct connected connected_check_ptp(struct interface ifp,
	114	union prefixconstptr pu,
	115	union prefixconstptr du)
	116	{
	117	const struct prefix *p = pu.p;
	118	const struct prefix *d = du.p;
	119	struct connected *ifc;
	120	struct listnode *node;
	121
	122	/* ignore broadcast addresses */
	123	if (p->prefixlen != IPV4_MAX_PREFIXLEN)
	124	d = NULL;
	125
	126	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
	127	if (!prefix_same(ifc->address, p))
	128	continue;
	129	if (!CONNECTED_PEER(ifc) && !d)
	130	return ifc;
	131	if (CONNECTED_PEER(ifc) && d
	132	&& prefix_same(ifc->destination, d))
	133	return ifc;
	134	}
	135
	136	return NULL;
	137	}
	138
02b4805f	139	/* Check if two ifc's describe the same address in the same state */
d62a17ae	140	static int connected_same(struct connected ifc1, struct connected ifc2)
74ecdc9e	141	{
d62a17ae	142	if (ifc1->ifp != ifc2->ifp)
	143	return 0;
	144
	145	if (ifc1->destination)
	146	if (!ifc2->destination)
	147	return 0;
	148	if (ifc2->destination)
	149	if (!ifc1->destination)
	150	return 0;
	151
	152	if (ifc1->destination && ifc2->destination)
	153	if (!prefix_same(ifc1->destination, ifc2->destination))
	154	return 0;
	155
	156	if (ifc1->flags != ifc2->flags)
	157	return 0;
	158
	159	if (ifc1->conf != ifc2->conf)
	160	return 0;
	161
	162	return 1;
74ecdc9e PJ	163	}
74ecdc9e PJ	164
d7f5dad6 CF	165	/* Handle changes to addresses and send the neccesary announcements
d7f5dad6 CF	166	* to clients. */
d62a17ae	167	static void connected_update(struct interface ifp, struct connected ifc)
74ecdc9e	168	{
d62a17ae	169	struct connected *current;
	170
	171	/* Check same connected route. */
abffde07 DL	172	current = connected_check_ptp(ifp, ifc->address, ifc->destination);
abffde07 DL	173	if (current) {
d62a17ae	174	if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
	175	SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
	176
	177	/* Avoid spurious withdraws, this might be just the kernel
	178	* 'reflecting'
	179	* back an address we have already added.
	180	*/
	181	if (connected_same(current, ifc)) {
	182	/* nothing to do */
	183	connected_free(ifc);
	184	return;
	185	}
	186
	187	/* Clear the configured flag on the old ifc, so it will be freed
	188	* by
	189	* connected withdraw. */
	190	UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
	191	connected_withdraw(
	192	current); /* implicit withdraw - freebsd does this */
	193	}
	194
	195	/* If the connected is new or has changed, announce it, if it is usable
	196	*/
	197	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
	198	connected_announce(ifp, ifc);
74ecdc9e PJ	199	}
74ecdc9e PJ	200
718e3744	201	/* Called from if_up(). */
ae87977c	202	void connected_up(struct interface ifp, struct connected ifc)
718e3744	203	{
ae87977c	204	afi_t afi;
d62a17ae	205	struct prefix p;
fd36be7e	206	struct nexthop nh = {
4a7371e9 DS	207	.type = NEXTHOP_TYPE_IFINDEX,
	208	.ifindex = ifp->ifindex,
	209	.vrf_id = ifp->vrf_id,
fd36be7e	210	};
d62a17ae	211
	212	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
	213	return;
	214
ae87977c	215	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
d62a17ae	216
	217	/* Apply mask to the network. */
	218	apply_mask(&p);
	219
ae87977c DS	220	afi = family2afi(p.family);
	221
	222	switch (afi) {
	223	case AFI_IP:
	224	/*
	225	* In case of connected address is 0.0.0.0/0 we treat it tunnel
	226	* address.
	227	*/
	228	if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
	229	return;
	230	break;
	231	case AFI_IP6:
	232	#ifndef LINUX
	233	/* XXX: It is already done by rib_bogus_ipv6 within rib_add */
	234	if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
	235	return;
	236	#endif
	237	break;
	238	default:
	239	zlog_warn("Received unknown AFI: %s", afi2str(afi));
d62a17ae	240	return;
ae87977c DS	241	break;
ae87977c DS	242	}
d62a17ae	243
4a7371e9 DS	244	rib_add(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
4a7371e9 DS	245	NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
d62a17ae	246
4a7371e9 DS	247	rib_add(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
4a7371e9 DS	248	NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
d62a17ae	249
ae87977c DS	250	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	251	char buf[PREFIX_STRLEN];
	252
996c9314 LB	253	zlog_debug(
	254	"%u: IF %s address %s add/up, scheduling RIB processing",
	255	ifp->vrf_id, ifp->name,
	256	prefix2str(&p, buf, sizeof(buf)));
ae87977c	257	}
d62a17ae	258	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
	259
	260	/* Schedule LSP forwarding entries for processing, if appropriate. */
	261	if (ifp->vrf_id == VRF_DEFAULT) {
ae87977c DS	262	if (IS_ZEBRA_DEBUG_MPLS) {
	263	char buf[PREFIX_STRLEN];
	264
996c9314 LB	265	zlog_debug(
	266	"%u: IF %s IP %s address add/up, scheduling MPLS processing",
	267	ifp->vrf_id, ifp->name,
	268	prefix2str(&p, buf, sizeof(buf)));
ae87977c	269	}
d62a17ae	270	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
d62a17ae	271	}
718e3744	272	}
	273
	274	/* Add connected IPv4 route to the interface. */
d62a17ae	275	void connected_add_ipv4(struct interface ifp, int flags, struct in_addr addr,
d7c0a89a	276	uint8_t prefixlen, struct in_addr *broad,
d62a17ae	277	const char *label)
718e3744	278	{
d62a17ae	279	struct prefix_ipv4 *p;
	280	struct connected *ifc;
	281
	282	if (ipv4_martian(addr))
	283	return;
	284
	285	/* Make connected structure. */
	286	ifc = connected_new();
	287	ifc->ifp = ifp;
	288	ifc->flags = flags;
	289	/* If we get a notification from the kernel,
	290	* we can safely assume the address is known to the kernel */
	291	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
	292
	293	/* Allocate new connected address. */
	294	p = prefix_ipv4_new();
	295	p->family = AF_INET;
	296	p->prefix = *addr;
abffde07 DL	297	p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
abffde07 DL	298	: prefixlen;
d62a17ae	299	ifc->address = (struct prefix *)p;
	300
	301	/* If there is broadcast or peer address. */
	302	if (broad) {
	303	p = prefix_ipv4_new();
	304	p->family = AF_INET;
	305	p->prefix = *broad;
	306	p->prefixlen = prefixlen;
	307	ifc->destination = (struct prefix *)p;
	308
	309	/* validate the destination address */
	310	if (CONNECTED_PEER(ifc)) {
	311	if (IPV4_ADDR_SAME(addr, broad))
	312	zlog_warn(
	313	"warning: interface %s has same local and peer "
	314	"address %s, routing protocols may malfunction",
	315	ifp->name, inet_ntoa(*addr));
	316	} else {
	317	if (broad->s_addr
	318	!= ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
	319	char buf[2][INET_ADDRSTRLEN];
	320	struct in_addr bcalc;
	321	bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
	322	prefixlen);
	323	zlog_warn(
	324	"warning: interface %s broadcast addr %s/%d != "
	325	"calculated %s, routing protocols may malfunction",
	326	ifp->name,
	327	inet_ntop(AF_INET, broad, buf[0],
	328	sizeof(buf[0])),
	329	prefixlen,
	330	inet_ntop(AF_INET, &bcalc, buf[1],
	331	sizeof(buf[1])));
	332	}
	333	}
	334
	335	} else {
	336	if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
	337	zlog_warn(
	338	"warning: %s called for interface %s "
	339	"with peer flag set, but no peer address supplied",
	340	__func__, ifp->name);
	341	UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
	342	}
	343
	344	/* no broadcast or destination address was supplied */
	345	if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
	346	zlog_warn(
	347	"warning: PtP interface %s with addr %s/%d needs a "
	348	"peer address",
	349	ifp->name, inet_ntoa(*addr), prefixlen);
e4529636 AS	350	}
e4529636 AS	351
d62a17ae	352	/* Label of this address. */
	353	if (label)
	354	ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
718e3744	355
d62a17ae	356	/* For all that I know an IPv4 address is always ready when we receive
	357	* the notification. So it should be safe to set the REAL flag here. */
	358	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
718e3744	359
d62a17ae	360	connected_update(ifp, ifc);
718e3744	361	}
718e3744	362
11461c63	363	void connected_down(struct interface ifp, struct connected ifc)
718e3744	364	{
11461c63	365	afi_t afi;
d62a17ae	366	struct prefix p;
fd36be7e	367	struct nexthop nh = {
4a7371e9 DS	368	.type = NEXTHOP_TYPE_IFINDEX,
	369	.ifindex = ifp->ifindex,
	370	.vrf_id = ifp->vrf_id,
fd36be7e	371	};
718e3744	372
d62a17ae	373	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
d62a17ae	374	return;
718e3744	375
11461c63	376	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
718e3744	377
d62a17ae	378	/* Apply mask to the network. */
d62a17ae	379	apply_mask(&p);
718e3744	380
11461c63 DS	381	afi = family2afi(p.family);
	382
	383	switch (afi) {
	384	case AFI_IP:
	385	/*
	386	* In case of connected address is 0.0.0.0/0 we treat it tunnel
	387	* address.
	388	*/
	389	if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
	390	return;
	391	break;
	392	case AFI_IP6:
	393	if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
	394	return;
	395	break;
	396	default:
	397	zlog_info("Unknown AFI: %s", afi2str(afi));
	398	break;
	399	}
718e3744	400
11461c63 DS	401	/*
	402	* Same logic as for connected_up(): push the changes into the
	403	* head.
	404	*/
	405	rib_delete(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
40ecd8e4	406	&p, NULL, &nh, 0, 0, 0, false);
718e3744	407
996c9314	408	rib_delete(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
40ecd8e4	409	&p, NULL, &nh, 0, 0, 0, false);
42cb6b66	410
11461c63 DS	411	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	412	char buf[PREFIX_STRLEN];
	413
996c9314 LB	414	zlog_debug(
	415	"%u: IF %s IP %s address down, scheduling RIB processing",
	416	ifp->vrf_id, ifp->name,
	417	prefix2str(&p, buf, sizeof(buf)));
11461c63	418	}
b84c7253	419
d62a17ae	420	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
40c7bdb0	421
d62a17ae	422	/* Schedule LSP forwarding entries for processing, if appropriate. */
d62a17ae	423	if (ifp->vrf_id == VRF_DEFAULT) {
11461c63 DS	424	if (IS_ZEBRA_DEBUG_MPLS) {
	425	char buf[PREFIX_STRLEN];
	426
996c9314 LB	427	zlog_debug(
	428	"%u: IF %s IP %s address down, scheduling MPLS processing",
	429	ifp->vrf_id, ifp->name,
	430	prefix2str(&p, buf, sizeof(buf)));
11461c63	431	}
d62a17ae	432	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
d62a17ae	433	}
718e3744	434	}
718e3744	435
dc7cd304 DS	436	static void connected_delete_helper(struct connected ifc, struct prefix p)
	437	{
	438	struct interface *ifp;
	439
	440	if (!ifc)
	441	return;
	442	ifp = ifc->ifp;
	443
	444	connected_withdraw(ifc);
	445
	446	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	447	char buf[PREFIX_STRLEN];
	448
996c9314 LB	449	zlog_debug(
	450	"%u: IF %s IP %s address del, scheduling RIB processing",
	451	ifp->vrf_id, ifp->name,
	452	prefix2str(p, buf, sizeof(buf)));
dc7cd304 DS	453	}
	454	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
	455
	456	/* Schedule LSP forwarding entries for processing, if appropriate. */
	457	if (ifp->vrf_id == VRF_DEFAULT) {
	458	if (IS_ZEBRA_DEBUG_MPLS) {
	459	char buf[PREFIX_STRLEN];
	460
996c9314 LB	461	zlog_debug(
	462	"%u: IF %s IP %s address delete, scheduling MPLS processing",
	463	ifp->vrf_id, ifp->name,
	464	prefix2str(p, buf, sizeof(buf)));
dc7cd304 DS	465	}
	466	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
	467	}
	468	}
	469
718e3744	470	/* Delete connected IPv4 route to the interface. */
d62a17ae	471	void connected_delete_ipv4(struct interface *ifp, int flags,
d7c0a89a	472	struct in_addr *addr, uint8_t prefixlen,
d62a17ae	473	struct in_addr *broad)
718e3744	474	{
dc7cd304	475	struct prefix p, d;
d62a17ae	476	struct connected *ifc;
d62a17ae	477
dc7cd304	478	memset(&p, 0, sizeof(struct prefix));
d62a17ae	479	p.family = AF_INET;
dc7cd304	480	p.u.prefix4 = *addr;
abffde07 DL	481	p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
	482	: prefixlen;
	483
	484	if (broad) {
dc7cd304	485	memset(&d, 0, sizeof(struct prefix));
abffde07	486	d.family = AF_INET;
dc7cd304	487	d.u.prefix4 = *broad;
abffde07	488	d.prefixlen = prefixlen;
dc7cd304	489	ifc = connected_check_ptp(ifp, &p, &d);
abffde07	490	} else
dc7cd304	491	ifc = connected_check_ptp(ifp, &p, NULL);
d62a17ae	492
dc7cd304	493	connected_delete_helper(ifc, &p);
718e3744	494	}
718e3744	495
718e3744	496	/* Add connected IPv6 route to the interface. */
d62a17ae	497	void connected_add_ipv6(struct interface ifp, int flags, struct in6_addr addr,
60c0687a DS	498	struct in6_addr *broad, uint8_t prefixlen,
60c0687a DS	499	const char *label)
718e3744	500	{
d62a17ae	501	struct prefix_ipv6 *p;
	502	struct connected *ifc;
	503
	504	if (ipv6_martian(addr))
	505	return;
	506
	507	/* Make connected structure. */
	508	ifc = connected_new();
	509	ifc->ifp = ifp;
	510	ifc->flags = flags;
	511	/* If we get a notification from the kernel,
	512	* we can safely assume the address is known to the kernel */
	513	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
	514
	515	/* Allocate new connected address. */
	516	p = prefix_ipv6_new();
	517	p->family = AF_INET6;
	518	IPV6_ADDR_COPY(&p->prefix, addr);
	519	p->prefixlen = prefixlen;
	520	ifc->address = (struct prefix *)p;
	521
f52d0a1a	522	if (broad) {
60c0687a DS	523	p = prefix_ipv6_new();
	524	p->family = AF_INET6;
	525	IPV6_ADDR_COPY(&p->prefix, broad);
	526	p->prefixlen = prefixlen;
	527	ifc->destination = (struct prefix *)p;
f52d0a1a DS	528	} else {
	529	if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
	530	zlog_warn("warning: %s called for interface %s with peer flag set, but no peer address supplied",
	531	__func__, ifp->name);
	532	UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
	533	}
60c0687a DS	534	}
60c0687a DS	535
d62a17ae	536	/* Label of this address. */
	537	if (label)
	538	ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
	539
	540	/* On Linux, we only get here when DAD is complete, therefore we can set
	541	* ZEBRA_IFC_REAL.
	542	*
	543	* On BSD, there currently doesn't seem to be a way to check for
	544	* completion of
	545	* DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
	546	* although DAD
	547	* might still be running.
	548	*/
	549	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
	550	connected_update(ifp, ifc);
718e3744	551	}
718e3744	552
d62a17ae	553	void connected_delete_ipv6(struct interface ifp, struct in6_addr address,
60c0687a	554	struct in6_addr *broad, uint8_t prefixlen)
718e3744	555	{
60c0687a	556	struct prefix p, d;
d62a17ae	557	struct connected *ifc;
d62a17ae	558
dc7cd304	559	memset(&p, 0, sizeof(struct prefix));
d62a17ae	560	p.family = AF_INET6;
dc7cd304	561	memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
d62a17ae	562	p.prefixlen = prefixlen;
d62a17ae	563
60c0687a DS	564	if (broad) {
	565	memset(&d, 0, sizeof(struct prefix));
	566	d.family = AF_INET6;
a85297a7	567	IPV6_ADDR_COPY(&d.u.prefix6, broad);
60c0687a DS	568	d.prefixlen = prefixlen;
	569	ifc = connected_check_ptp(ifp, &p, &d);
	570	} else
	571	ifc = connected_check_ptp(ifp, &p, NULL);
d62a17ae	572
dc7cd304	573	connected_delete_helper(ifc, &p);
718e3744	574	}
d44ca835	575
d62a17ae	576	int connected_is_unnumbered(struct interface *ifp)
d44ca835	577	{
d62a17ae	578	struct connected *connected;
	579	struct listnode *node;
	580
	581	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
	582	if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
	583	&& connected->address->family == AF_INET)
	584	return CHECK_FLAG(connected->flags,
	585	ZEBRA_IFA_UNNUMBERED);
	586	}
	587	return 0;
d44ca835	588	}