/* SPDX-License-Identifier: GPL-2.0-or-later *//* * include/net/l3mdev.h - L3 master device API * Copyright (c) 2015 Cumulus Networks * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> */#ifndef _NET_L3MDEV_H_#define _NET_L3MDEV_H_ #include <net/dst.h>#include <net/fib_rules.h> enum l3mdev_type {	L3MDEV_TYPE_UNSPEC,	L3MDEV_TYPE_VRF,	__L3MDEV_TYPE_MAX}; #define L3MDEV_TYPE_MAX (__L3MDEV_TYPE_MAX - 1) typedef int (*lookup_by_table_id_t)(struct net *net, u32 table_d); /** * struct l3mdev_ops - l3mdev operations * * @l3mdev_fib_table: Get FIB table id to use for lookups * * @l3mdev_l3_rcv:    Hook in L3 receive path * * @l3mdev_l3_out:    Hook in L3 output path * * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations */ struct l3mdev_ops {	u32		(*l3mdev_fib_table)(const struct net_device *dev);	struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,					  struct sk_buff *skb, u16 proto);	struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,					  struct sock *sk, struct sk_buff *skb,					  u16 proto); 	/* IPv6 ops */	struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,						 struct flowi6 *fl6);}; #ifdef CONFIG_NET_L3_MASTER_DEV int l3mdev_table_lookup_register(enum l3mdev_type l3type,				 lookup_by_table_id_t fn); void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,				    lookup_by_table_id_t fn); int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,				      u32 table_id); int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,			  struct fib_lookup_arg *arg); static inlinebool l3mdev_fib_rule_iif_match(const struct flowi *fl, int iifindex){	return !(fl->flowi_flags & FLOWI_FLAG_L3MDEV_OIF) &&	       fl->flowi_l3mdev == iifindex;} static inlinebool l3mdev_fib_rule_oif_match(const struct flowi *fl, int oifindex){	return fl->flowi_flags & FLOWI_FLAG_L3MDEV_OIF &&	       fl->flowi_l3mdev == oifindex;} void l3mdev_update_flow(struct net *net, struct flowi *fl); int l3mdev_master_ifindex_rcu(const struct net_device *dev);static inline int l3mdev_master_ifindex(struct net_device *dev){	int ifindex; 	rcu_read_lock();	ifindex = l3mdev_master_ifindex_rcu(dev);	rcu_read_unlock(); 	return ifindex;} static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex){	struct net_device *dev;	int rc = 0; 	if (ifindex) {		rcu_read_lock(); 		dev = dev_get_by_index_rcu(net, ifindex);		if (dev)			rc = l3mdev_master_ifindex_rcu(dev); 		rcu_read_unlock();	} 	return rc;} static inlinestruct net_device *l3mdev_master_dev_rcu(const 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	 */	struct net_device *dev = (struct net_device *)_dev;	struct net_device *master; 	if (!dev)		return NULL; 	if (netif_is_l3_master(dev))		master = dev;	else if (netif_is_l3_slave(dev))		master = netdev_master_upper_dev_get_rcu(dev);	else		master = NULL; 	return master;} int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);static inlineint l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex){	rcu_read_lock();	ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex);	rcu_read_unlock(); 	return ifindex;} u32 l3mdev_fib_table_rcu(const struct net_device *dev);u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);static inline u32 l3mdev_fib_table(const struct net_device *dev){	u32 tb_id; 	rcu_read_lock();	tb_id = l3mdev_fib_table_rcu(dev);	rcu_read_unlock(); 	return tb_id;} static inline bool netif_index_is_l3_master(struct net *net, int ifindex){	struct net_device *dev;	bool rc = false; 	if (ifindex == 0)		return false; 	rcu_read_lock(); 	dev = dev_get_by_index_rcu(net, ifindex);	if (dev)		rc = netif_is_l3_master(dev); 	rcu_read_unlock(); 	return rc;} struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); static inlinestruct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto){	struct net_device *master = NULL; 	if (netif_is_l3_slave(skb->dev))		master = netdev_master_upper_dev_get_rcu(skb->dev);	else if (netif_is_l3_master(skb->dev) ||		 netif_has_l3_rx_handler(skb->dev))		master = skb->dev; 	if (master && master->l3mdev_ops->l3mdev_l3_rcv)		skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); 	return skb;} static inlinestruct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb){	return l3mdev_l3_rcv(skb, AF_INET);} static inlinestruct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb){	return l3mdev_l3_rcv(skb, AF_INET6);} static inlinestruct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto){	struct net_device *dev; 	rcu_read_lock();	dev = skb_dst_dev_rcu(skb);	if (netif_is_l3_slave(dev)) {		struct net_device *master; 		master = netdev_master_upper_dev_get_rcu(dev);		if (master && master->l3mdev_ops->l3mdev_l3_out)			skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,								skb, proto);	}	rcu_read_unlock(); 	return skb;} static inlinestruct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb){	return l3mdev_l3_out(sk, skb, AF_INET);} static inlinestruct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb){	return l3mdev_l3_out(sk, skb, AF_INET6);}#else static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev){	return 0;}static inline int l3mdev_master_ifindex(struct net_device *dev){	return 0;} static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex){	return 0;} static inlineint l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex){	return 0;}static inlineint l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex){	return 0;} static inlinestruct net_device *l3mdev_master_dev_rcu(const struct net_device *dev){	return NULL;} static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev){	return 0;}static inline u32 l3mdev_fib_table(const struct net_device *dev){	return 0;}static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex){	return 0;} static inline bool netif_index_is_l3_master(struct net *net, int ifindex){	return false;} static inlinestruct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6){	return NULL;} static inlinestruct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb){	return skb;} static inlinestruct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb){	return skb;} static inlinestruct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb){	return skb;} static inlinestruct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb){	return skb;} static inlineint l3mdev_table_lookup_register(enum l3mdev_type l3type,				 lookup_by_table_id_t fn){	return -EOPNOTSUPP;} static inlinevoid l3mdev_table_lookup_unregister(enum l3mdev_type l3type,				    lookup_by_table_id_t fn){} static inlineint l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,				      u32 table_id){	return -ENODEV;} static inlineint l3mdev_fib_rule_match(struct net *net, struct flowi *fl,			  struct fib_lookup_arg *arg){	return 1;} static inlinebool l3mdev_fib_rule_iif_match(const struct flowi *fl, int iifindex){	return false;} static inlinebool l3mdev_fib_rule_oif_match(const struct flowi *fl, int oifindex){	return false;} static inlinevoid l3mdev_update_flow(struct net *net, struct flowi *fl){}#endif #endif /* _NET_L3MDEV_H_ */