/* * net/l3mdev/l3mdev.c - L3 master device implementation * Copyright (c) 2015 Cumulus Networks * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> * * This program 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 of the License, or * (at your option) any later version. */ #include <linux/netdevice.h>#include <net/fib_rules.h>#include <net/l3mdev.h> /** *	l3mdev_master_ifindex - get index of L3 master device *	@dev: targeted interface */ int l3mdev_master_ifindex_rcu(const struct net_device *dev){	int ifindex = 0; 	if (!dev)		return 0; 	if (netif_is_l3_master(dev)) {		ifindex = dev->ifindex;	} else if (netif_is_l3_slave(dev)) {		struct net_device *master;		struct net_device *_dev = (struct net_device *)dev; 		/* netdev_master_upper_dev_get_rcu calls		 * list_first_or_null_rcu to walk the upper dev list.		 * list_first_or_null_rcu does not handle a const arg. We aren't		 * making changes, just want the master device from that list so		 * typecast to remove the const		 */		master = netdev_master_upper_dev_get_rcu(_dev);		if (master)			ifindex = master->ifindex;	} 	return ifindex;}EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); /** *	l3mdev_fib_table - get FIB table id associated with an L3 *                             master interface *	@dev: targeted interface */ u32 l3mdev_fib_table_rcu(const struct net_device *dev){	u32 tb_id = 0; 	if (!dev)		return 0; 	if (netif_is_l3_master(dev)) {		if (dev->l3mdev_ops->l3mdev_fib_table)			tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);	} else if (netif_is_l3_slave(dev)) {		/* Users of netdev_master_upper_dev_get_rcu need non-const,		 * but current inet_*type functions take a const		 */		struct net_device *_dev = (struct net_device *) dev;		const struct net_device *master; 		master = netdev_master_upper_dev_get_rcu(_dev);		if (master &&		    master->l3mdev_ops->l3mdev_fib_table)			tb_id = master->l3mdev_ops->l3mdev_fib_table(master);	} 	return tb_id;}EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu); u32 l3mdev_fib_table_by_index(struct net *net, int ifindex){	struct net_device *dev;	u32 tb_id = 0; 	if (!ifindex)		return 0; 	rcu_read_lock(); 	dev = dev_get_by_index_rcu(net, ifindex);	if (dev)		tb_id = l3mdev_fib_table_rcu(dev); 	rcu_read_unlock(); 	return tb_id;}EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index); /** *	l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link *			     local and multicast addresses *	@net: network namespace for device index lookup *	@fl6: IPv6 flow struct for lookup */ struct dst_entry *l3mdev_link_scope_lookup(struct net *net,					   struct flowi6 *fl6){	struct dst_entry *dst = NULL;	struct net_device *dev; 	if (fl6->flowi6_oif) {		rcu_read_lock(); 		dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);		if (dev && netif_is_l3_slave(dev))			dev = netdev_master_upper_dev_get_rcu(dev); 		if (dev && netif_is_l3_master(dev) &&		    dev->l3mdev_ops->l3mdev_link_scope_lookup)			dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6); 		rcu_read_unlock();	} 	return dst;}EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup); /** *	l3mdev_fib_rule_match - Determine if flowi references an *				L3 master device *	@net: network namespace for device index lookup *	@fl:  flow struct */ int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,			  struct fib_lookup_arg *arg){	struct net_device *dev;	int rc = 0; 	rcu_read_lock(); 	dev = dev_get_by_index_rcu(net, fl->flowi_oif);	if (dev && netif_is_l3_master(dev) &&	    dev->l3mdev_ops->l3mdev_fib_table) {		arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);		rc = 1;		goto out;	} 	dev = dev_get_by_index_rcu(net, fl->flowi_iif);	if (dev && netif_is_l3_master(dev) &&	    dev->l3mdev_ops->l3mdev_fib_table) {		arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);		rc = 1;		goto out;	} out:	rcu_read_unlock(); 	return rc;} void l3mdev_update_flow(struct net *net, struct flowi *fl){	struct net_device *dev;	int ifindex; 	rcu_read_lock(); 	if (fl->flowi_oif) {		dev = dev_get_by_index_rcu(net, fl->flowi_oif);		if (dev) {			ifindex = l3mdev_master_ifindex_rcu(dev);			if (ifindex) {				fl->flowi_oif = ifindex;				fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;				goto out;			}		}	} 	if (fl->flowi_iif) {		dev = dev_get_by_index_rcu(net, fl->flowi_iif);		if (dev) {			ifindex = l3mdev_master_ifindex_rcu(dev);			if (ifindex) {				fl->flowi_iif = ifindex;				fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;			}		}	} out:	rcu_read_unlock();}EXPORT_SYMBOL_GPL(l3mdev_update_flow);