Commit 8a3d0316 authored by Andy Gospodarek's avatar Andy Gospodarek Committed by David S. Miller
Browse files

net: track link-status of ipv4 nexthops 



Add a fib flag called RTNH_F_LINKDOWN to any ipv4 nexthops that are
reachable via an interface where carrier is off.  No action is taken,
but additional flags are passed to userspace to indicate carrier status.

This also includes a cleanup to fib_disable_ip to more clearly indicate
what event made the function call to replace the more cryptic force
option previously used.

v2: Split out kernel functionality into 2 patches, this patch simply
sets and clears new nexthop flag RTNH_F_LINKDOWN.

v3: Cleanups suggested by Alex as well as a bug noticed in
fib_sync_down_dev and fib_sync_up when multipath was not enabled.

v5: Whitespace and variable declaration fixups suggested by Dave.

v6: Style fixups noticed by Dave; ran checkpatch to be sure I got them
all.

Signed-off-by: default avatarAndy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: default avatarDinesh Dutt <ddutt@cumulusnetworks.com>
Acked-by: default avatarScott Feldman <sfeldma@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5c8079d0

include/net/ip_fib.h

+2 −2
Original line number Diff line number Diff line
@@ -305,9 +305,9 @@ void fib_flush_external(struct net *net); 


/* Exported by fib_semantics.c */

int ip_fib_check_default(__be32 gw, struct net_device *dev);

int fib_sync_down_dev(struct net_device *dev, int force);

int fib_sync_down_dev(struct net_device *dev, unsigned long event);

int fib_sync_down_addr(struct net *net, __be32 local);

int fib_sync_up(struct net_device *dev);

int fib_sync_up(struct net_device *dev, unsigned int nh_flags);

void fib_select_multipath(struct fib_result *res);



/* Exported by fib_trie.c */

include/uapi/linux/rtnetlink.h

+3 −0
Original line number Diff line number Diff line
@@ -338,6 +338,9 @@ struct rtnexthop { 
#define RTNH_F_PERVASIVE	2	/* Do recursive gateway lookup	*/

#define RTNH_F_ONLINK		4	/* Gateway is forced on link	*/

#define RTNH_F_OFFLOAD		8	/* offloaded route */

#define RTNH_F_LINKDOWN		16	/* carrier-down on nexthop */



#define RTNH_COMPARE_MASK	(RTNH_F_DEAD | RTNH_F_LINKDOWN)



/* Macros to handle hexthops */

net/ipv4/fib_frontend.c

+15 −8
Original line number Diff line number Diff line
@@ -1063,9 +1063,9 @@ static void nl_fib_lookup_exit(struct net *net) 
	net->ipv4.fibnl = NULL;

}



static void fib_disable_ip(struct net_device *dev, int force)

static void fib_disable_ip(struct net_device *dev, unsigned long event)

{

	if (fib_sync_down_dev(dev, force))

	if (fib_sync_down_dev(dev, event))

		fib_flush(dev_net(dev));

	rt_cache_flush(dev_net(dev));

	arp_ifdown(dev);
@@ -1081,7 +1081,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, 
	case NETDEV_UP:

		fib_add_ifaddr(ifa);

#ifdef CONFIG_IP_ROUTE_MULTIPATH

		fib_sync_up(dev);

		fib_sync_up(dev, RTNH_F_DEAD);

#endif

		atomic_inc(&net->ipv4.dev_addr_genid);

		rt_cache_flush(dev_net(dev));
@@ -1093,7 +1093,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, 
			/* Last address was deleted from this interface.

			 * Disable IP.

			 */

			fib_disable_ip(dev, 1);

			fib_disable_ip(dev, event);

		} else {

			rt_cache_flush(dev_net(dev));

		}
@@ -1107,9 +1107,10 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo 
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

	struct in_device *in_dev;

	struct net *net = dev_net(dev);

	unsigned int flags;



	if (event == NETDEV_UNREGISTER) {

		fib_disable_ip(dev, 2);

		fib_disable_ip(dev, event);

		rt_flush_dev(dev);

		return NOTIFY_DONE;

	}
@@ -1124,16 +1125,22 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo 
			fib_add_ifaddr(ifa);

		} endfor_ifa(in_dev);

#ifdef CONFIG_IP_ROUTE_MULTIPATH

		fib_sync_up(dev);

		fib_sync_up(dev, RTNH_F_DEAD);

#endif

		atomic_inc(&net->ipv4.dev_addr_genid);

		rt_cache_flush(net);

		break;

	case NETDEV_DOWN:

		fib_disable_ip(dev, 0);

		fib_disable_ip(dev, event);

		break;

	case NETDEV_CHANGEMTU:

	case NETDEV_CHANGE:

		flags = dev_get_flags(dev);

		if (flags & (IFF_RUNNING | IFF_LOWER_UP))

			fib_sync_up(dev, RTNH_F_LINKDOWN);

		else

			fib_sync_down_dev(dev, event);

		/* fall through */

	case NETDEV_CHANGEMTU:

		rt_cache_flush(net);

		break;

	}

net/ipv4/fib_semantics.c

+47 −13
Original line number Diff line number Diff line
@@ -266,7 +266,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) 
#ifdef CONFIG_IP_ROUTE_CLASSID

		    nh->nh_tclassid != onh->nh_tclassid ||

#endif

		    ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD))

		    ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK))

			return -1;

		onh++;

	} endfor_nexthops(fi);
@@ -318,7 +318,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi) 
		    nfi->fib_type == fi->fib_type &&

		    memcmp(nfi->fib_metrics, fi->fib_metrics,

			   sizeof(u32) * RTAX_MAX) == 0 &&

		    ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&

		    !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) &&

		    (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))

			return fi;

	}
@@ -604,6 +604,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, 
				return -ENODEV;

			if (!(dev->flags & IFF_UP))

				return -ENETDOWN;

			if (!netif_carrier_ok(dev))

				nh->nh_flags |= RTNH_F_LINKDOWN;

			nh->nh_dev = dev;

			dev_hold(dev);

			nh->nh_scope = RT_SCOPE_LINK;
@@ -636,6 +638,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, 
		if (!dev)

			goto out;

		dev_hold(dev);

		if (!netif_carrier_ok(dev))

			nh->nh_flags |= RTNH_F_LINKDOWN;

		err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;

	} else {

		struct in_device *in_dev;
@@ -654,6 +658,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, 
		nh->nh_dev = in_dev->dev;

		dev_hold(nh->nh_dev);

		nh->nh_scope = RT_SCOPE_HOST;

		if (!netif_carrier_ok(nh->nh_dev))

			nh->nh_flags |= RTNH_F_LINKDOWN;

		err = 0;

	}

out:
@@ -920,11 +926,17 @@ struct fib_info *fib_create_info(struct fib_config *cfg) 
		if (!nh->nh_dev)

			goto failure;

	} else {

		int linkdown = 0;



		change_nexthops(fi) {

			err = fib_check_nh(cfg, fi, nexthop_nh);

			if (err != 0)

				goto failure;

			if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN)

				linkdown++;

		} endfor_nexthops(fi)

		if (linkdown == fi->fib_nhs)

			fi->fib_flags |= RTNH_F_LINKDOWN;

	}



	if (fi->fib_prefsrc) {
@@ -1103,7 +1115,7 @@ int fib_sync_down_addr(struct net *net, __be32 local) 
	return ret;

}



int fib_sync_down_dev(struct net_device *dev, int force)

int fib_sync_down_dev(struct net_device *dev, unsigned long event)

{

	int ret = 0;

	int scope = RT_SCOPE_NOWHERE;
@@ -1112,7 +1124,8 @@ int fib_sync_down_dev(struct net_device *dev, int force) 
	struct hlist_head *head = &fib_info_devhash[hash];

	struct fib_nh *nh;



	if (force)

	if (event == NETDEV_UNREGISTER ||

	    event == NETDEV_DOWN)

		scope = -1;



	hlist_for_each_entry(nh, head, nh_hash) {
@@ -1129,7 +1142,15 @@ int fib_sync_down_dev(struct net_device *dev, int force) 
				dead++;

			else if (nexthop_nh->nh_dev == dev &&

				 nexthop_nh->nh_scope != scope) {

				switch (event) {

				case NETDEV_DOWN:

				case NETDEV_UNREGISTER:

					nexthop_nh->nh_flags |= RTNH_F_DEAD;

					/* fall through */

				case NETDEV_CHANGE:

					nexthop_nh->nh_flags |= RTNH_F_LINKDOWN;

					break;

				}

#ifdef CONFIG_IP_ROUTE_MULTIPATH

				spin_lock_bh(&fib_multipath_lock);

				fi->fib_power -= nexthop_nh->nh_power;
@@ -1139,14 +1160,23 @@ int fib_sync_down_dev(struct net_device *dev, int force) 
				dead++;

			}

#ifdef CONFIG_IP_ROUTE_MULTIPATH

			if (force > 1 && nexthop_nh->nh_dev == dev) {

			if (event == NETDEV_UNREGISTER &&

			    nexthop_nh->nh_dev == dev) {

				dead = fi->fib_nhs;

				break;

			}

#endif

		} endfor_nexthops(fi)

		if (dead == fi->fib_nhs) {

			switch (event) {

			case NETDEV_DOWN:

			case NETDEV_UNREGISTER:

				fi->fib_flags |= RTNH_F_DEAD;

				/* fall through */

			case NETDEV_CHANGE:

				fi->fib_flags |= RTNH_F_LINKDOWN;

				break;

			}

			ret++;

		}

	}
@@ -1210,13 +1240,11 @@ out: 
	return;

}



#ifdef CONFIG_IP_ROUTE_MULTIPATH



/*

 * Dead device goes up. We wake up dead nexthops.

 * It takes sense only on multipath routes.

 */

int fib_sync_up(struct net_device *dev)

int fib_sync_up(struct net_device *dev, unsigned int nh_flags)

{

	struct fib_info *prev_fi;

	unsigned int hash;
@@ -1243,7 +1271,7 @@ int fib_sync_up(struct net_device *dev) 
		prev_fi = fi;

		alive = 0;

		change_nexthops(fi) {

			if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) {

			if (!(nexthop_nh->nh_flags & nh_flags)) {

				alive++;

				continue;

			}
@@ -1254,14 +1282,18 @@ int fib_sync_up(struct net_device *dev) 
			    !__in_dev_get_rtnl(dev))

				continue;

			alive++;

#ifdef CONFIG_IP_ROUTE_MULTIPATH

			spin_lock_bh(&fib_multipath_lock);

			nexthop_nh->nh_power = 0;

			nexthop_nh->nh_flags &= ~RTNH_F_DEAD;

			nexthop_nh->nh_flags &= ~nh_flags;

			spin_unlock_bh(&fib_multipath_lock);

#else

			nexthop_nh->nh_flags &= ~nh_flags;

#endif

		} endfor_nexthops(fi)



		if (alive > 0) {

			fi->fib_flags &= ~RTNH_F_DEAD;

			fi->fib_flags &= ~nh_flags;

			ret++;

		}

	}
@@ -1269,6 +1301,8 @@ int fib_sync_up(struct net_device *dev) 
	return ret;

}



#ifdef CONFIG_IP_ROUTE_MULTIPATH



/*

 * The algorithm is suboptimal, but it provides really

 * fair weighted route distribution.

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