/* * net/switchdev/switchdev.c - Switch device API * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.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/kernel.h>#include <linux/types.h>#include <linux/init.h>#include <linux/mutex.h>#include <linux/notifier.h>#include <linux/netdevice.h>#include <net/ip_fib.h>#include <net/switchdev.h> /** *	netdev_switch_parent_id_get - Get ID of a switch *	@dev: port device *	@psid: switch ID * *	Get ID of a switch this port is part of. */int netdev_switch_parent_id_get(struct net_device *dev,				struct netdev_phys_item_id *psid){	const struct swdev_ops *ops = dev->swdev_ops; 	if (!ops || !ops->swdev_parent_id_get)		return -EOPNOTSUPP;	return ops->swdev_parent_id_get(dev, psid);}EXPORT_SYMBOL_GPL(netdev_switch_parent_id_get); /** *	netdev_switch_port_stp_update - Notify switch device port of STP *					state change *	@dev: port device *	@state: port STP state * *	Notify switch device port of bridge port STP state change. */int netdev_switch_port_stp_update(struct net_device *dev, u8 state){	const struct swdev_ops *ops = dev->swdev_ops;	struct net_device *lower_dev;	struct list_head *iter;	int err = -EOPNOTSUPP; 	if (ops && ops->swdev_port_stp_update)		return ops->swdev_port_stp_update(dev, state); 	netdev_for_each_lower_dev(dev, lower_dev, iter) {		err = netdev_switch_port_stp_update(lower_dev, state);		if (err && err != -EOPNOTSUPP)			return err;	} 	return err;}EXPORT_SYMBOL_GPL(netdev_switch_port_stp_update); static DEFINE_MUTEX(netdev_switch_mutex);static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain); /** *	register_netdev_switch_notifier - Register notifier *	@nb: notifier_block * *	Register switch device notifier. This should be used by code *	which needs to monitor events happening in particular device. *	Return values are same as for atomic_notifier_chain_register(). */int register_netdev_switch_notifier(struct notifier_block *nb){	int err; 	mutex_lock(&netdev_switch_mutex);	err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb);	mutex_unlock(&netdev_switch_mutex);	return err;}EXPORT_SYMBOL_GPL(register_netdev_switch_notifier); /** *	unregister_netdev_switch_notifier - Unregister notifier *	@nb: notifier_block * *	Unregister switch device notifier. *	Return values are same as for atomic_notifier_chain_unregister(). */int unregister_netdev_switch_notifier(struct notifier_block *nb){	int err; 	mutex_lock(&netdev_switch_mutex);	err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb);	mutex_unlock(&netdev_switch_mutex);	return err;}EXPORT_SYMBOL_GPL(unregister_netdev_switch_notifier); /** *	call_netdev_switch_notifiers - Call notifiers *	@val: value passed unmodified to notifier function *	@dev: port device *	@info: notifier information data * *	Call all network notifier blocks. This should be called by driver *	when it needs to propagate hardware event. *	Return values are same as for atomic_notifier_call_chain(). */int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,				 struct netdev_switch_notifier_info *info){	int err; 	info->dev = dev;	mutex_lock(&netdev_switch_mutex);	err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info);	mutex_unlock(&netdev_switch_mutex);	return err;}EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers); /** *	netdev_switch_port_bridge_setlink - Notify switch device port of bridge *	port attributes * *	@dev: port device *	@nlh: netlink msg with bridge port attributes *	@flags: bridge setlink flags * *	Notify switch device port of bridge port attributes */int netdev_switch_port_bridge_setlink(struct net_device *dev,				      struct nlmsghdr *nlh, u16 flags){	const struct net_device_ops *ops = dev->netdev_ops; 	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))		return 0; 	if (!ops->ndo_bridge_setlink)		return -EOPNOTSUPP; 	return ops->ndo_bridge_setlink(dev, nlh, flags);}EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_setlink); /** *	netdev_switch_port_bridge_dellink - Notify switch device port of bridge *	port attribute delete * *	@dev: port device *	@nlh: netlink msg with bridge port attributes *	@flags: bridge setlink flags * *	Notify switch device port of bridge port attribute delete */int netdev_switch_port_bridge_dellink(struct net_device *dev,				      struct nlmsghdr *nlh, u16 flags){	const struct net_device_ops *ops = dev->netdev_ops; 	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))		return 0; 	if (!ops->ndo_bridge_dellink)		return -EOPNOTSUPP; 	return ops->ndo_bridge_dellink(dev, nlh, flags);}EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_dellink); /** *	ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink *						     op for master devices * *	@dev: port device *	@nlh: netlink msg with bridge port attributes *	@flags: bridge setlink flags * *	Notify master device slaves of bridge port attributes */int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,					       struct nlmsghdr *nlh, u16 flags){	struct net_device *lower_dev;	struct list_head *iter;	int ret = 0, err = 0; 	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))		return ret; 	netdev_for_each_lower_dev(dev, lower_dev, iter) {		err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);		if (err && err != -EOPNOTSUPP)			ret = err;	} 	return ret;}EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_setlink); /** *	ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink *						     op for master devices * *	@dev: port device *	@nlh: netlink msg with bridge port attributes *	@flags: bridge dellink flags * *	Notify master device slaves of bridge port attribute deletes */int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,					       struct nlmsghdr *nlh, u16 flags){	struct net_device *lower_dev;	struct list_head *iter;	int ret = 0, err = 0; 	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))		return ret; 	netdev_for_each_lower_dev(dev, lower_dev, iter) {		err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);		if (err && err != -EOPNOTSUPP)			ret = err;	} 	return ret;}EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_dellink); static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev){	const struct swdev_ops *ops = dev->swdev_ops;	struct net_device *lower_dev;	struct net_device *port_dev;	struct list_head *iter; 	/* Recusively search down until we find a sw port dev.	 * (A sw port dev supports swdev_parent_id_get).	 */ 	if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&	    ops && ops->swdev_parent_id_get)		return dev; 	netdev_for_each_lower_dev(dev, lower_dev, iter) {		port_dev = netdev_switch_get_lowest_dev(lower_dev);		if (port_dev)			return port_dev;	} 	return NULL;} static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi){	struct netdev_phys_item_id psid;	struct netdev_phys_item_id prev_psid;	struct net_device *dev = NULL;	int nhsel; 	/* For this route, all nexthop devs must be on the same switch. */ 	for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {		const struct fib_nh *nh = &fi->fib_nh[nhsel]; 		if (!nh->nh_dev)			return NULL; 		dev = netdev_switch_get_lowest_dev(nh->nh_dev);		if (!dev)			return NULL; 		if (netdev_switch_parent_id_get(dev, &psid))			return NULL; 		if (nhsel > 0) {			if (prev_psid.id_len != psid.id_len)				return NULL;			if (memcmp(prev_psid.id, psid.id, psid.id_len))				return NULL;		} 		prev_psid = psid;	} 	return dev;} /** *	netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch * *	@dst: route's IPv4 destination address *	@dst_len: destination address length (prefix length) *	@fi: route FIB info structure *	@tos: route TOS *	@type: route type *	@nlflags: netlink flags passed in (NLM_F_*) *	@tb_id: route table ID * *	Add IPv4 route entry to switch device. */int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,			       u8 tos, u8 type, u32 nlflags, u32 tb_id){	struct net_device *dev;	const struct swdev_ops *ops;	int err = 0; 	/* Don't offload route if using custom ip rules or if	 * IPv4 FIB offloading has been disabled completely.	 */ #ifdef CONFIG_IP_MULTIPLE_TABLES	if (fi->fib_net->ipv4.fib_has_custom_rules)		return 0;#endif 	if (fi->fib_net->ipv4.fib_offload_disabled)		return 0; 	dev = netdev_switch_get_dev_by_nhs(fi);	if (!dev)		return 0;	ops = dev->swdev_ops; 	if (ops->swdev_fib_ipv4_add) {		err = ops->swdev_fib_ipv4_add(dev, htonl(dst), dst_len,					      fi, tos, type, nlflags,					      tb_id);		if (!err)			fi->fib_flags |= RTNH_F_EXTERNAL;	} 	return err;}EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_add); /** *	netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch * *	@dst: route's IPv4 destination address *	@dst_len: destination address length (prefix length) *	@fi: route FIB info structure *	@tos: route TOS *	@type: route type *	@tb_id: route table ID * *	Delete IPv4 route entry from switch device. */int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,			       u8 tos, u8 type, u32 tb_id){	struct net_device *dev;	const struct swdev_ops *ops;	int err = 0; 	if (!(fi->fib_flags & RTNH_F_EXTERNAL))		return 0; 	dev = netdev_switch_get_dev_by_nhs(fi);	if (!dev)		return 0;	ops = dev->swdev_ops; 	if (ops->swdev_fib_ipv4_del) {		err = ops->swdev_fib_ipv4_del(dev, htonl(dst), dst_len,					      fi, tos, type, tb_id);		if (!err)			fi->fib_flags &= ~RTNH_F_EXTERNAL;	} 	return err;}EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_del); /** *	netdev_switch_fib_ipv4_abort - Abort an IPv4 FIB operation * *	@fi: route FIB info structure */void netdev_switch_fib_ipv4_abort(struct fib_info *fi){	/* There was a problem installing this route to the offload	 * device.  For now, until we come up with more refined	 * policy handling, abruptly end IPv4 fib offloading for	 * for entire net by flushing offload device(s) of all	 * IPv4 routes, and mark IPv4 fib offloading broken from	 * this point forward.	 */ 	fib_flush_external(fi->fib_net);	fi->fib_net->ipv4.fib_offload_disabled = true;}EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_abort);