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Release 4.12 include/net/l3mdev.h

Directory: include/net
/*
 * include/net/l3mdev.h - L3 master device API
 * 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.
 */
#ifndef _NET_L3MDEV_H_

#define _NET_L3MDEV_H_

#include <net/dst.h>
#include <net/fib_rules.h>

/**
 * 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_fib_rule_match(struct net *net, struct flowi *fl,
			  struct fib_lookup_arg *arg);

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; }

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static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) { struct net_device *dev; int rc = 0; if (likely(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; }

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static inline struct 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; }

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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; }

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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; }

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struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
static inline struct 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)) master = skb->dev; if (master && master->l3mdev_ops->l3mdev_l3_rcv) skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); return skb; }

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static inline struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) { return l3mdev_l3_rcv(skb, AF_INET); }

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static inline struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) { return l3mdev_l3_rcv(skb, AF_INET6); }

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static inline struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto) { struct net_device *dev = skb_dst(skb)->dev; 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); } return skb; }

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static inline struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) { return l3mdev_l3_out(sk, skb, AF_INET); }

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static inline struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) { return l3mdev_l3_out(sk, skb, AF_INET6); }

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#else
static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) { return 0; }

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static inline int l3mdev_master_ifindex(struct net_device *dev) { return 0; }

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static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) { return 0; }

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static inline struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) { return NULL; }

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static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) { return 0; }

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static inline u32 l3mdev_fib_table(const struct net_device *dev) { return 0; }

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static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) { return 0; }

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static inline bool netif_index_is_l3_master(struct net *net, int ifindex) { return false; }

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static inline struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) { return NULL; }

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static inline struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) { return skb; }

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static inline struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) { return skb; }

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static inline struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) { return skb; }

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static inline struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) { return skb; }

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static inline int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, struct fib_lookup_arg *arg) { return 1; }

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static inline void l3mdev_update_flow(struct net *net, struct flowi *fl) { }

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#endif #endif /* _NET_L3MDEV_H_ */

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Directory: include/net
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