Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 639 insertions, 0 deletions

diff --git a/zebra/connected.c b/zebra/connected.c
new file mode 100644
index 0000000..c01be58
--- /dev/null
+++ b/zebra/connected.c
@@ -0,0 +1,639 @@
+/*
+ * 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 "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/zebra_errors.h"
+#include "zebra/zebra_router.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) {
+		if (ifc->address->prefixlen == IPV4_MAX_BITLEN)
+			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;
+
+	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->flags != ifc2->flags)
+		return 0;
+
+	if (ifc1->conf != ifc2->conf)
+		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;
+
+	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->vrf_id,
+	};
+	struct zebra_vrf *zvrf;
+	uint32_t metric;
+	uint32_t flags = 0;
+	uint32_t count = 0;
+	struct listnode *cnode;
+	struct connected *c;
+
+	zvrf = ifp->vrf->info;
+	if (!zvrf) {
+		flog_err(
+			EC_ZEBRA_VRF_NOT_FOUND,
+			"%s: Received Up for interface but no associated zvrf: %s(%d)",
+			__func__, ifp->vrf->name, ifp->vrf->vrf_id);
+		return;
+	}
+	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
+		return;
+
+	/* Ensure 'down' flag is cleared */
+	UNSET_FLAG(ifc->conf, ZEBRA_IFC_DOWN);
+
+	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 GNU_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;
+	}
+
+	metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
+				ifc->metric : ifp->metric;
+
+	/*
+	 * Since we are hand creating the connected routes
+	 * in our main routing table, *if* we are working
+	 * in an offloaded environment then we need to
+	 * pretend like the route is offloaded so everything
+	 * else will work
+	 */
+	if (zrouter.asic_offloaded)
+		flags |= ZEBRA_FLAG_OFFLOADED;
+
+	/*
+	 * It's possible to add the same network and mask
+	 * to an interface over and over.  This would
+	 * result in an equivalent number of connected
+	 * routes.  Just add one connected route in
+	 * for all the addresses on an interface that
+	 * resolve to the same network and mask
+	 */
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) {
+		struct prefix cp;
+
+		prefix_copy(&cp, CONNECTED_PREFIX(c));
+		apply_mask(&cp);
+
+		if (prefix_same(&cp, &p) &&
+		    !CHECK_FLAG(c->conf, ZEBRA_IFC_DOWN))
+			count++;
+
+		if (count >= 2)
+			return;
+	}
+
+	rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
+		flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0,
+		false);
+
+	rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
+		flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0,
+		false);
+
+	/* Schedule LSP forwarding entries for processing, if appropriate. */
+	if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
+		if (IS_ZEBRA_DEBUG_MPLS)
+			zlog_debug(
+				"%u: IF %s IP %pFX address add/up, scheduling MPLS processing",
+				zvrf->vrf->vrf_id, ifp->name, &p);
+		mpls_mark_lsps_for_processing(zvrf, &p);
+	}
+}
+
+/* Add connected IPv4 route to the interface. */
+void connected_add_ipv4(struct interface *ifp, int flags,
+			const struct in_addr *addr, uint16_t prefixlen,
+			const struct in_addr *dest, const char *label,
+			uint32_t metric)
+{
+	struct prefix_ipv4 *p;
+	struct connected *ifc;
+
+	if (ipv4_martian(addr))
+		return;
+
+	/* Make connected structure. */
+	ifc = connected_new();
+	ifc->ifp = ifp;
+	ifc->flags = flags;
+	ifc->metric = metric;
+	/* 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);
+	if (!if_is_operative(ifp))
+		SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN);
+
+	/* 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_BITLEN : prefixlen;
+	ifc->address = (struct prefix *)p;
+
+	/* If there is a peer address. */
+	if (CONNECTED_PEER(ifc)) {
+		/* validate the destination address */
+		if (dest) {
+			p = prefix_ipv4_new();
+			p->family = AF_INET;
+			p->prefix = *dest;
+			p->prefixlen = prefixlen;
+			ifc->destination = (struct prefix *)p;
+
+			if (IPV4_ADDR_SAME(addr, dest))
+				flog_warn(
+					EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
+					"interface %s has same local and peer address %pI4, routing protocols may malfunction",
+					ifp->name, addr);
+		} else {
+			zlog_debug(
+				"%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 destination address was supplied */
+	if (!dest && (prefixlen == IPV4_MAX_BITLEN) && if_is_pointopoint(ifp))
+		zlog_debug(
+			"PtP interface %s with addr %pI4/%d needs a peer address",
+			ifp->name, 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->vrf_id,
+	};
+	struct zebra_vrf *zvrf;
+	uint32_t count = 0;
+	struct listnode *cnode;
+	struct connected *c;
+
+	zvrf = ifp->vrf->info;
+	if (!zvrf) {
+		flog_err(
+			EC_ZEBRA_VRF_NOT_FOUND,
+			"%s: Received Down for interface but no associated zvrf: %s(%d)",
+			__func__, ifp->vrf->name, ifp->vrf->vrf_id);
+		return;
+	}
+
+	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
+		return;
+
+	/* Skip if we've already done this; this can happen if we have a
+	 * config change that takes an interface down, then we receive kernel
+	 * notifications about the downed interface and its addresses.
+	 */
+	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_DOWN)) {
+		if (IS_ZEBRA_DEBUG_RIB)
+			zlog_debug("%s: ifc %p, %pFX already DOWN",
+				   __func__, ifc, ifc->address);
+		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_warn("Unknown AFI: %s", afi2str(afi));
+		break;
+	}
+
+	/* Mark the address as 'down' */
+	SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN);
+
+	/*
+	 * It's possible to have X number of addresses
+	 * on a interface that all resolve to the same
+	 * network and mask.  Find them and just
+	 * allow the deletion when are removing the last
+	 * one.
+	 */
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) {
+		struct prefix cp;
+
+		prefix_copy(&cp, CONNECTED_PREFIX(c));
+		apply_mask(&cp);
+
+		if (prefix_same(&p, &cp) &&
+		    !CHECK_FLAG(c->conf, ZEBRA_IFC_DOWN))
+			count++;
+
+		if (count >= 1)
+			return;
+	}
+
+	/*
+	 * Same logic as for connected_up(): push the changes into the
+	 * head.
+	 */
+	rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
+		   0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
+
+	rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
+		   0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
+
+	/* Schedule LSP forwarding entries for processing, if appropriate. */
+	if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
+		if (IS_ZEBRA_DEBUG_MPLS)
+			zlog_debug(
+				"%u: IF %s IP %pFX address down, scheduling MPLS processing",
+				zvrf->vrf->vrf_id, ifp->name, &p);
+		mpls_mark_lsps_for_processing(zvrf, &p);
+	}
+}
+
+static void connected_delete_helper(struct connected *ifc, struct prefix *p)
+{
+	struct interface *ifp;
+
+	if (!ifc)
+		return;
+	ifp = ifc->ifp;
+
+	connected_withdraw(ifc);
+
+	/* Schedule LSP forwarding entries for processing, if appropriate. */
+	if (ifp->vrf->vrf_id == VRF_DEFAULT) {
+		if (IS_ZEBRA_DEBUG_MPLS)
+			zlog_debug(
+				"%u: IF %s IP %pFX address delete, scheduling MPLS processing",
+				ifp->vrf->vrf_id, ifp->name, p);
+		mpls_mark_lsps_for_processing(ifp->vrf->info, p);
+	}
+}
+
+/* Delete connected IPv4 route to the interface. */
+void connected_delete_ipv4(struct interface *ifp, int flags,
+			   const struct in_addr *addr, uint16_t prefixlen,
+			   const struct in_addr *dest)
+{
+	struct prefix p, d;
+	struct connected *ifc;
+
+	memset(&p, 0, sizeof(p));
+	p.family = AF_INET;
+	p.u.prefix4 = *addr;
+	p.prefixlen =
+		CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_BITLEN : prefixlen;
+
+	if (dest) {
+		memset(&d, 0, sizeof(d));
+		d.family = AF_INET;
+		d.u.prefix4 = *dest;
+		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,
+			const struct in6_addr *addr,
+			const struct in6_addr *dest, uint16_t prefixlen,
+			const char *label, uint32_t metric)
+{
+	struct prefix_ipv6 *p;
+	struct connected *ifc;
+
+	if (ipv6_martian(addr))
+		return;
+
+	/* Make connected structure. */
+	ifc = connected_new();
+	ifc->ifp = ifp;
+	ifc->flags = flags;
+	ifc->metric = metric;
+	/* 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);
+	if (!if_is_operative(ifp))
+		SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN);
+
+	/* 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;
+
+	/* Add global ipv6 address to the RA prefix list */
+	if (!IN6_IS_ADDR_LINKLOCAL(&p->prefix))
+		rtadv_add_prefix(ifp->info, p);
+
+	if (dest) {
+		p = prefix_ipv6_new();
+		p->family = AF_INET6;
+		IPV6_ADDR_COPY(&p->prefix, dest);
+		p->prefixlen = prefixlen;
+		ifc->destination = (struct prefix *)p;
+	} else {
+		if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
+			zlog_debug(
+				"%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,
+			   const struct in6_addr *address,
+			   const struct in6_addr *dest, uint16_t prefixlen)
+{
+	struct prefix p, d;
+	struct connected *ifc;
+
+	memset(&p, 0, sizeof(p));
+	p.family = AF_INET6;
+	memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
+	p.prefixlen = prefixlen;
+
+	/* Delete global ipv6 address from RA prefix list */
+	if (!IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6))
+		rtadv_delete_prefix(ifp->info, &p);
+
+	if (dest) {
+		memset(&d, 0, sizeof(d));
+		d.family = AF_INET6;
+		IPV6_ADDR_COPY(&d.u.prefix6, dest);
+		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;
+}