[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"
#include "zebra/zebra_errors.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:
		flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
			  "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))
				flog_warn(
					EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
					"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);
				flog_warn(
					EC_ZEBRA_BCAST_ADDR_MISMATCH,
					"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_debug(
				"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_debug(
				"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_debug(
				"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"
9df414fe	43	#include "zebra/zebra_errors.h"
6b0655a2	44
02b4805f	45	/* communicate the withdrawal of a connected address */
d62a17ae	46	static void connected_withdraw(struct connected *ifc)
ca16218d	47	{
d62a17ae	48	if (!ifc)
d62a17ae	49	return;
ca16218d	50
d62a17ae	51	/* Update interface address information to protocol daemon. */
	52	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
	53	zebra_interface_address_delete_update(ifc->ifp, ifc);
ca16218d	54
d62a17ae	55	if (ifc->address->family == AF_INET)
d62a17ae	56	if_subnet_delete(ifc->ifp, ifc);
9db047fc	57
11461c63	58	connected_down(ifc->ifp, ifc);
ca16218d	59
d62a17ae	60	UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
d62a17ae	61	}
ca16218d	62
d62a17ae	63	/* The address is not in the kernel anymore, so clear the flag */
d62a17ae	64	UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
f7f740fe	65
d62a17ae	66	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
	67	listnode_delete(ifc->ifp->connected, ifc);
	68	connected_free(ifc);
	69	}
ca16218d	70	}
ca16218d	71
d62a17ae	72	static void connected_announce(struct interface ifp, struct connected ifc)
ca16218d	73	{
d62a17ae	74	if (!ifc)
	75	return;
	76
b0fa6f6a CS	77	if (!if_is_loopback(ifp) && ifc->address->family == AF_INET &&
b0fa6f6a CS	78	!IS_ZEBRA_IF_VRF(ifp)) {
d62a17ae	79	if (ifc->address->prefixlen == 32)
	80	SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
	81	else
	82	UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
	83	}
	84
	85	listnode_add(ifp->connected, ifc);
	86
	87	/* Update interface address information to protocol daemon. */
	88	if (ifc->address->family == AF_INET)
	89	if_subnet_add(ifp, ifc);
	90
	91	zebra_interface_address_add_update(ifp, ifc);
	92
	93	if (if_is_operative(ifp)) {
ae87977c	94	connected_up(ifp, ifc);
d62a17ae	95	}
ca16218d	96	}
6b0655a2	97
718e3744	98	/* If same interface address is already exist... */
abffde07 DL	99	struct connected connected_check(struct interface ifp,
abffde07 DL	100	union prefixconstptr pu)
718e3744	101	{
abffde07	102	const struct prefix *p = pu.p;
d62a17ae	103	struct connected *ifc;
d62a17ae	104	struct listnode *node;
718e3744	105
d62a17ae	106	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
	107	if (prefix_same(ifc->address, p))
	108	return ifc;
718e3744	109
d62a17ae	110	return NULL;
718e3744	111	}
718e3744	112
abffde07 DL	113	/* same, but with peer address */
	114	struct connected connected_check_ptp(struct interface ifp,
	115	union prefixconstptr pu,
	116	union prefixconstptr du)
	117	{
	118	const struct prefix *p = pu.p;
	119	const struct prefix *d = du.p;
	120	struct connected *ifc;
	121	struct listnode *node;
	122
	123	/* ignore broadcast addresses */
	124	if (p->prefixlen != IPV4_MAX_PREFIXLEN)
	125	d = NULL;
	126
	127	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
	128	if (!prefix_same(ifc->address, p))
	129	continue;
	130	if (!CONNECTED_PEER(ifc) && !d)
	131	return ifc;
	132	if (CONNECTED_PEER(ifc) && d
	133	&& prefix_same(ifc->destination, d))
	134	return ifc;
	135	}
	136
	137	return NULL;
	138	}
	139
02b4805f	140	/* Check if two ifc's describe the same address in the same state */
d62a17ae	141	static int connected_same(struct connected ifc1, struct connected ifc2)
74ecdc9e	142	{
d62a17ae	143	if (ifc1->ifp != ifc2->ifp)
	144	return 0;
	145
	146	if (ifc1->destination)
	147	if (!ifc2->destination)
	148	return 0;
	149	if (ifc2->destination)
	150	if (!ifc1->destination)
	151	return 0;
	152
	153	if (ifc1->destination && ifc2->destination)
	154	if (!prefix_same(ifc1->destination, ifc2->destination))
	155	return 0;
	156
	157	if (ifc1->flags != ifc2->flags)
	158	return 0;
	159
	160	if (ifc1->conf != ifc2->conf)
	161	return 0;
	162
	163	return 1;
74ecdc9e PJ	164	}
74ecdc9e PJ	165
d7f5dad6 CF	166	/* Handle changes to addresses and send the neccesary announcements
d7f5dad6 CF	167	* to clients. */
d62a17ae	168	static void connected_update(struct interface ifp, struct connected ifc)
74ecdc9e	169	{
d62a17ae	170	struct connected *current;
	171
	172	/* Check same connected route. */
abffde07 DL	173	current = connected_check_ptp(ifp, ifc->address, ifc->destination);
abffde07 DL	174	if (current) {
d62a17ae	175	if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
	176	SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
	177
	178	/* Avoid spurious withdraws, this might be just the kernel
	179	* 'reflecting'
	180	* back an address we have already added.
	181	*/
	182	if (connected_same(current, ifc)) {
	183	/* nothing to do */
	184	connected_free(ifc);
	185	return;
	186	}
	187
	188	/* Clear the configured flag on the old ifc, so it will be freed
	189	* by
	190	* connected withdraw. */
	191	UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
	192	connected_withdraw(
	193	current); /* implicit withdraw - freebsd does this */
	194	}
	195
	196	/* If the connected is new or has changed, announce it, if it is usable
	197	*/
	198	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
	199	connected_announce(ifp, ifc);
74ecdc9e PJ	200	}
74ecdc9e PJ	201
718e3744	202	/* Called from if_up(). */
ae87977c	203	void connected_up(struct interface ifp, struct connected ifc)
718e3744	204	{
ae87977c	205	afi_t afi;
d62a17ae	206	struct prefix p;
fd36be7e	207	struct nexthop nh = {
4a7371e9 DS	208	.type = NEXTHOP_TYPE_IFINDEX,
	209	.ifindex = ifp->ifindex,
	210	.vrf_id = ifp->vrf_id,
fd36be7e	211	};
d62a17ae	212
	213	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
	214	return;
	215
ae87977c	216	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
d62a17ae	217
	218	/* Apply mask to the network. */
	219	apply_mask(&p);
	220
ae87977c DS	221	afi = family2afi(p.family);
	222
	223	switch (afi) {
	224	case AFI_IP:
	225	/*
	226	* In case of connected address is 0.0.0.0/0 we treat it tunnel
	227	* address.
	228	*/
	229	if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
	230	return;
	231	break;
	232	case AFI_IP6:
	233	#ifndef LINUX
	234	/* XXX: It is already done by rib_bogus_ipv6 within rib_add */
	235	if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
	236	return;
	237	#endif
	238	break;
	239	default:
e914ccbe	240	flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
9df414fe	241	"Received unknown AFI: %s", afi2str(afi));
d62a17ae	242	return;
ae87977c DS	243	break;
ae87977c DS	244	}
d62a17ae	245
4a7371e9 DS	246	rib_add(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
4a7371e9 DS	247	NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
d62a17ae	248
4a7371e9 DS	249	rib_add(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
4a7371e9 DS	250	NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
d62a17ae	251
ae87977c DS	252	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	253	char buf[PREFIX_STRLEN];
	254
996c9314 LB	255	zlog_debug(
	256	"%u: IF %s address %s add/up, scheduling RIB processing",
	257	ifp->vrf_id, ifp->name,
	258	prefix2str(&p, buf, sizeof(buf)));
ae87977c	259	}
d62a17ae	260	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
	261
	262	/* Schedule LSP forwarding entries for processing, if appropriate. */
	263	if (ifp->vrf_id == VRF_DEFAULT) {
ae87977c DS	264	if (IS_ZEBRA_DEBUG_MPLS) {
	265	char buf[PREFIX_STRLEN];
	266
996c9314 LB	267	zlog_debug(
	268	"%u: IF %s IP %s address add/up, scheduling MPLS processing",
	269	ifp->vrf_id, ifp->name,
	270	prefix2str(&p, buf, sizeof(buf)));
ae87977c	271	}
d62a17ae	272	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
d62a17ae	273	}
718e3744	274	}
	275
	276	/* Add connected IPv4 route to the interface. */
d62a17ae	277	void connected_add_ipv4(struct interface ifp, int flags, struct in_addr addr,
d7c0a89a	278	uint8_t prefixlen, struct in_addr *broad,
d62a17ae	279	const char *label)
718e3744	280	{
d62a17ae	281	struct prefix_ipv4 *p;
	282	struct connected *ifc;
	283
	284	if (ipv4_martian(addr))
	285	return;
	286
	287	/* Make connected structure. */
	288	ifc = connected_new();
	289	ifc->ifp = ifp;
	290	ifc->flags = flags;
	291	/* If we get a notification from the kernel,
	292	* we can safely assume the address is known to the kernel */
	293	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
	294
	295	/* Allocate new connected address. */
	296	p = prefix_ipv4_new();
	297	p->family = AF_INET;
	298	p->prefix = *addr;
abffde07 DL	299	p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
abffde07 DL	300	: prefixlen;
d62a17ae	301	ifc->address = (struct prefix *)p;
	302
	303	/* If there is broadcast or peer address. */
	304	if (broad) {
	305	p = prefix_ipv4_new();
	306	p->family = AF_INET;
	307	p->prefix = *broad;
	308	p->prefixlen = prefixlen;
	309	ifc->destination = (struct prefix *)p;
	310
	311	/* validate the destination address */
	312	if (CONNECTED_PEER(ifc)) {
	313	if (IPV4_ADDR_SAME(addr, broad))
9df414fe	314	flog_warn(
e914ccbe	315	EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
d62a17ae	316	"warning: interface %s has same local and peer "
	317	"address %s, routing protocols may malfunction",
	318	ifp->name, inet_ntoa(*addr));
	319	} else {
	320	if (broad->s_addr
	321	!= ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
	322	char buf[2][INET_ADDRSTRLEN];
	323	struct in_addr bcalc;
	324	bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
	325	prefixlen);
9df414fe	326	flog_warn(
e914ccbe	327	EC_ZEBRA_BCAST_ADDR_MISMATCH,
d62a17ae	328	"warning: interface %s broadcast addr %s/%d != "
	329	"calculated %s, routing protocols may malfunction",
	330	ifp->name,
	331	inet_ntop(AF_INET, broad, buf[0],
	332	sizeof(buf[0])),
	333	prefixlen,
	334	inet_ntop(AF_INET, &bcalc, buf[1],
	335	sizeof(buf[1])));
	336	}
	337	}
	338
	339	} else {
	340	if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
9df414fe	341	zlog_debug(
d62a17ae	342	"warning: %s called for interface %s "
	343	"with peer flag set, but no peer address supplied",
	344	__func__, ifp->name);
	345	UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
	346	}
	347
	348	/* no broadcast or destination address was supplied */
	349	if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
9df414fe	350	zlog_debug(
d62a17ae	351	"warning: PtP interface %s with addr %s/%d needs a "
	352	"peer address",
	353	ifp->name, inet_ntoa(*addr), prefixlen);
e4529636 AS	354	}
e4529636 AS	355
d62a17ae	356	/* Label of this address. */
	357	if (label)
	358	ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
718e3744	359
d62a17ae	360	/* For all that I know an IPv4 address is always ready when we receive
	361	* the notification. So it should be safe to set the REAL flag here. */
	362	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
718e3744	363
d62a17ae	364	connected_update(ifp, ifc);
718e3744	365	}
718e3744	366
11461c63	367	void connected_down(struct interface ifp, struct connected ifc)
718e3744	368	{
11461c63	369	afi_t afi;
d62a17ae	370	struct prefix p;
fd36be7e	371	struct nexthop nh = {
4a7371e9 DS	372	.type = NEXTHOP_TYPE_IFINDEX,
	373	.ifindex = ifp->ifindex,
	374	.vrf_id = ifp->vrf_id,
fd36be7e	375	};
718e3744	376
d62a17ae	377	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
d62a17ae	378	return;
718e3744	379
11461c63	380	PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
718e3744	381
d62a17ae	382	/* Apply mask to the network. */
d62a17ae	383	apply_mask(&p);
718e3744	384
11461c63 DS	385	afi = family2afi(p.family);
	386
	387	switch (afi) {
	388	case AFI_IP:
	389	/*
	390	* In case of connected address is 0.0.0.0/0 we treat it tunnel
	391	* address.
	392	*/
	393	if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
	394	return;
	395	break;
	396	case AFI_IP6:
	397	if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
	398	return;
	399	break;
	400	default:
	401	zlog_info("Unknown AFI: %s", afi2str(afi));
	402	break;
	403	}
718e3744	404
11461c63 DS	405	/*
	406	* Same logic as for connected_up(): push the changes into the
	407	* head.
	408	*/
	409	rib_delete(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
40ecd8e4	410	&p, NULL, &nh, 0, 0, 0, false);
718e3744	411
996c9314	412	rib_delete(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
40ecd8e4	413	&p, NULL, &nh, 0, 0, 0, false);
42cb6b66	414
11461c63 DS	415	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	416	char buf[PREFIX_STRLEN];
	417
996c9314 LB	418	zlog_debug(
	419	"%u: IF %s IP %s address down, scheduling RIB processing",
	420	ifp->vrf_id, ifp->name,
	421	prefix2str(&p, buf, sizeof(buf)));
11461c63	422	}
b84c7253	423
d62a17ae	424	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
40c7bdb0	425
d62a17ae	426	/* Schedule LSP forwarding entries for processing, if appropriate. */
d62a17ae	427	if (ifp->vrf_id == VRF_DEFAULT) {
11461c63 DS	428	if (IS_ZEBRA_DEBUG_MPLS) {
	429	char buf[PREFIX_STRLEN];
	430
996c9314 LB	431	zlog_debug(
	432	"%u: IF %s IP %s address down, scheduling MPLS processing",
	433	ifp->vrf_id, ifp->name,
	434	prefix2str(&p, buf, sizeof(buf)));
11461c63	435	}
d62a17ae	436	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
d62a17ae	437	}
718e3744	438	}
718e3744	439
dc7cd304 DS	440	static void connected_delete_helper(struct connected ifc, struct prefix p)
	441	{
	442	struct interface *ifp;
	443
	444	if (!ifc)
	445	return;
	446	ifp = ifc->ifp;
	447
	448	connected_withdraw(ifc);
	449
	450	if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
	451	char buf[PREFIX_STRLEN];
	452
996c9314 LB	453	zlog_debug(
	454	"%u: IF %s IP %s address del, scheduling RIB processing",
	455	ifp->vrf_id, ifp->name,
	456	prefix2str(p, buf, sizeof(buf)));
dc7cd304 DS	457	}
	458	rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
	459
	460	/* Schedule LSP forwarding entries for processing, if appropriate. */
	461	if (ifp->vrf_id == VRF_DEFAULT) {
	462	if (IS_ZEBRA_DEBUG_MPLS) {
	463	char buf[PREFIX_STRLEN];
	464
996c9314 LB	465	zlog_debug(
	466	"%u: IF %s IP %s address delete, scheduling MPLS processing",
	467	ifp->vrf_id, ifp->name,
	468	prefix2str(p, buf, sizeof(buf)));
dc7cd304 DS	469	}
	470	mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
	471	}
	472	}
	473
718e3744	474	/* Delete connected IPv4 route to the interface. */
d62a17ae	475	void connected_delete_ipv4(struct interface *ifp, int flags,
d7c0a89a	476	struct in_addr *addr, uint8_t prefixlen,
d62a17ae	477	struct in_addr *broad)
718e3744	478	{
dc7cd304	479	struct prefix p, d;
d62a17ae	480	struct connected *ifc;
d62a17ae	481
dc7cd304	482	memset(&p, 0, sizeof(struct prefix));
d62a17ae	483	p.family = AF_INET;
dc7cd304	484	p.u.prefix4 = *addr;
abffde07 DL	485	p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
	486	: prefixlen;
	487
	488	if (broad) {
dc7cd304	489	memset(&d, 0, sizeof(struct prefix));
abffde07	490	d.family = AF_INET;
dc7cd304	491	d.u.prefix4 = *broad;
abffde07	492	d.prefixlen = prefixlen;
dc7cd304	493	ifc = connected_check_ptp(ifp, &p, &d);
abffde07	494	} else
dc7cd304	495	ifc = connected_check_ptp(ifp, &p, NULL);
d62a17ae	496
dc7cd304	497	connected_delete_helper(ifc, &p);
718e3744	498	}
718e3744	499
718e3744	500	/* Add connected IPv6 route to the interface. */
d62a17ae	501	void connected_add_ipv6(struct interface ifp, int flags, struct in6_addr addr,
60c0687a DS	502	struct in6_addr *broad, uint8_t prefixlen,
60c0687a DS	503	const char *label)
718e3744	504	{
d62a17ae	505	struct prefix_ipv6 *p;
	506	struct connected *ifc;
	507
	508	if (ipv6_martian(addr))
	509	return;
	510
	511	/* Make connected structure. */
	512	ifc = connected_new();
	513	ifc->ifp = ifp;
	514	ifc->flags = flags;
	515	/* If we get a notification from the kernel,
	516	* we can safely assume the address is known to the kernel */
	517	SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
	518
	519	/* Allocate new connected address. */
	520	p = prefix_ipv6_new();
	521	p->family = AF_INET6;
	522	IPV6_ADDR_COPY(&p->prefix, addr);
	523	p->prefixlen = prefixlen;
	524	ifc->address = (struct prefix *)p;
	525
f52d0a1a	526	if (broad) {
60c0687a DS	527	p = prefix_ipv6_new();
	528	p->family = AF_INET6;
	529	IPV6_ADDR_COPY(&p->prefix, broad);
	530	p->prefixlen = prefixlen;
	531	ifc->destination = (struct prefix *)p;
f52d0a1a DS	532	} else {
f52d0a1a DS	533	if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
9df414fe QY	534	zlog_debug(
	535	"warning: %s called for interface %s with peer flag set, but no peer address supplied",
	536	__func__, ifp->name);
f52d0a1a DS	537	UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
f52d0a1a DS	538	}
60c0687a DS	539	}
60c0687a DS	540
d62a17ae	541	/* Label of this address. */
	542	if (label)
	543	ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
	544
	545	/* On Linux, we only get here when DAD is complete, therefore we can set
	546	* ZEBRA_IFC_REAL.
	547	*
	548	* On BSD, there currently doesn't seem to be a way to check for
	549	* completion of
	550	* DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
	551	* although DAD
	552	* might still be running.
	553	*/
	554	SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
	555	connected_update(ifp, ifc);
718e3744	556	}
718e3744	557
d62a17ae	558	void connected_delete_ipv6(struct interface ifp, struct in6_addr address,
60c0687a	559	struct in6_addr *broad, uint8_t prefixlen)
718e3744	560	{
60c0687a	561	struct prefix p, d;
d62a17ae	562	struct connected *ifc;
d62a17ae	563
dc7cd304	564	memset(&p, 0, sizeof(struct prefix));
d62a17ae	565	p.family = AF_INET6;
dc7cd304	566	memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
d62a17ae	567	p.prefixlen = prefixlen;
d62a17ae	568
60c0687a DS	569	if (broad) {
	570	memset(&d, 0, sizeof(struct prefix));
	571	d.family = AF_INET6;
a85297a7	572	IPV6_ADDR_COPY(&d.u.prefix6, broad);
60c0687a DS	573	d.prefixlen = prefixlen;
	574	ifc = connected_check_ptp(ifp, &p, &d);
	575	} else
	576	ifc = connected_check_ptp(ifp, &p, NULL);
d62a17ae	577
dc7cd304	578	connected_delete_helper(ifc, &p);
718e3744	579	}
d44ca835	580
d62a17ae	581	int connected_is_unnumbered(struct interface *ifp)
d44ca835	582	{
d62a17ae	583	struct connected *connected;
	584	struct listnode *node;
	585
	586	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
	587	if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
	588	&& connected->address->family == AF_INET)
	589	return CHECK_FLAG(connected->flags,
	590	ZEBRA_IFA_UNNUMBERED);
	591	}
	592	return 0;
d44ca835	593	}