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linux/include/net/l3mdev.h
Andrea Mayer 49042c220b l3mdev: add infrastructure for table to VRF mapping 
Add infrastructure to l3mdev (the core code for Layer 3 master devices) in
order to find out the corresponding VRF device for a given table id.
Therefore, the l3mdev implementations:
 - can register a callback that returns the device index of the l3mdev
   associated with a given table id;
 - can offer the lookup function (table to VRF device).

Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-20 17:22:22 -07:00

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/* 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);
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 (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;
}
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;
}
int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
static inline
int 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 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) ||
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 inline
struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
{
return l3mdev_l3_rcv(skb, AF_INET);
}
static inline
struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
{
return l3mdev_l3_rcv(skb, AF_INET6);
}
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;
}
static inline
struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
{
return l3mdev_l3_out(sk, skb, AF_INET);
}
static inline
struct 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 inline
int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
{
return 0;
}
static inline
int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
{
return 0;
}
static inline
struct 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 inline
struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
{
return NULL;
}
static inline
struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
{
return skb;
}
static inline
struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
{
return skb;
}
static inline
struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
{
return skb;
}
static inline
struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
{
return skb;
}
static inline
int l3mdev_table_lookup_register(enum l3mdev_type l3type,
lookup_by_table_id_t fn)
{
return -EOPNOTSUPP;
}
static inline
void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
lookup_by_table_id_t fn)
{
}
static inline
int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,
u32 table_id)
{
return -ENODEV;
}
static inline
int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
struct fib_lookup_arg *arg)
{
return 1;
}
static inline
void l3mdev_update_flow(struct net *net, struct flowi *fl)
{
}
#endif
#endif /* _NET_L3MDEV_H_ */
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