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net: Introduce VRF related flags and helpers

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Add a VRF_MASTER flag for interfaces and helper functions for determining
if a device is a VRF_MASTER.

Add link attribute for passing VRF_TABLE id.

Add vrf_ptr to netdevice.

Add various macros for determining if a device is a VRF device, the index
of the master VRF device and table associated with VRF device.

Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-08-13 14:59:00 -06:00 committed by David S. Miller
parent 0344338bd8
commit 4e3c89920c
3 changed files with 168 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

20
include/linux/netdevice.h
View file

@ -1289,6 +1289,7 @@ enum netdev_priv_flags {
IFF_XMIT_DST_RELEASE_PERM = 1<<22,
IFF_IPVLAN_MASTER = 1<<23,
IFF_IPVLAN_SLAVE = 1<<24,
IFF_VRF_MASTER = 1<<25,
};
#define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
@ -1316,6 +1317,7 @@ enum netdev_priv_flags {
#define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM
#define IFF_IPVLAN_MASTER IFF_IPVLAN_MASTER
#define IFF_IPVLAN_SLAVE IFF_IPVLAN_SLAVE
#define IFF_VRF_MASTER IFF_VRF_MASTER
/**
* struct net_device - The DEVICE structure.
@ -1432,6 +1434,7 @@ enum netdev_priv_flags {
* @dn_ptr: DECnet specific data
* @ip6_ptr: IPv6 specific data
* @ax25_ptr: AX.25 specific data
* @vrf_ptr: VRF specific data
* @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
*
* @last_rx: Time of last Rx
@ -1650,6 +1653,7 @@ struct net_device {
struct dn_dev __rcu *dn_ptr;
struct inet6_dev __rcu *ip6_ptr;
void *ax25_ptr;
struct net_vrf_dev __rcu *vrf_ptr;
struct wireless_dev *ieee80211_ptr;
struct wpan_dev *ieee802154_ptr;
#if IS_ENABLED(CONFIG_MPLS_ROUTING)
@ -3808,6 +3812,22 @@ static inline bool netif_supports_nofcs(struct net_device *dev)
return dev->priv_flags & IFF_SUPP_NOFCS;
}
static inline bool netif_is_vrf(const struct net_device *dev)
{
return dev->priv_flags & IFF_VRF_MASTER;
}
static inline bool netif_index_is_vrf(struct net *net, int ifindex)
{
struct net_device *dev = dev_get_by_index_rcu(net, ifindex);
bool rc = false;
if (dev)
rc = netif_is_vrf(dev);
return rc;
}
/* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
static inline void netif_keep_dst(struct net_device *dev)
{

139
include/net/vrf.h Normal file
View file

@ -0,0 +1,139 @@
/*
* include/net/net_vrf.h - adds vrf dev structure definitions
* Copyright (c) 2015 Cumulus Networks
*
* 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 __LINUX_NET_VRF_H
#define __LINUX_NET_VRF_H
struct net_vrf_dev {
struct rcu_head rcu;
int ifindex; /* ifindex of master dev */
u32 tb_id; /* table id for VRF */
};
struct slave {
struct list_head list;
struct net_device *dev;
};
struct slave_queue {
struct list_head all_slaves;
int num_slaves;
};
struct net_vrf {
struct slave_queue queue;
struct rtable *rth;
u32 tb_id;
};
#if IS_ENABLED(CONFIG_NET_VRF)
/* called with rcu_read_lock() */
static inline int vrf_master_ifindex_rcu(const struct net_device *dev)
{
struct net_vrf_dev *vrf_ptr;
int ifindex = 0;
if (!dev)
return 0;
if (netif_is_vrf(dev))
ifindex = dev->ifindex;
else {
vrf_ptr = rcu_dereference(dev->vrf_ptr);
if (vrf_ptr)
ifindex = vrf_ptr->ifindex;
}
return ifindex;
}
/* called with rcu_read_lock */
static inline int vrf_dev_table_rcu(const struct net_device *dev)
{
int tb_id = 0;
if (dev) {
struct net_vrf_dev *vrf_ptr;
vrf_ptr = rcu_dereference(dev->vrf_ptr);
if (vrf_ptr)
tb_id = vrf_ptr->tb_id;
}
return tb_id;
}
static inline int vrf_dev_table(const struct net_device *dev)
{
int tb_id;
rcu_read_lock();
tb_id = vrf_dev_table_rcu(dev);
rcu_read_unlock();
return tb_id;
}
/* called with rtnl */
static inline int vrf_dev_table_rtnl(const struct net_device *dev)
{
int tb_id = 0;
if (dev) {
struct net_vrf_dev *vrf_ptr;
vrf_ptr = rtnl_dereference(dev->vrf_ptr);
if (vrf_ptr)
tb_id = vrf_ptr->tb_id;
}
return tb_id;
}
/* caller has already checked netif_is_vrf(dev) */
static inline struct rtable *vrf_dev_get_rth(const struct net_device *dev)
{
struct rtable *rth = ERR_PTR(-ENETUNREACH);
struct net_vrf *vrf = netdev_priv(dev);
if (vrf) {
rth = vrf->rth;
atomic_inc(&rth->dst.__refcnt);
}
return rth;
}
#else
static inline int vrf_master_ifindex_rcu(const struct net_device *dev)
{
return 0;
}
static inline int vrf_dev_table_rcu(const struct net_device *dev)
{
return 0;
}
static inline int vrf_dev_table(const struct net_device *dev)
{
return 0;
}
static inline int vrf_dev_table_rtnl(const struct net_device *dev)
{
return 0;
}
static inline struct rtable *vrf_dev_get_rth(const struct net_device *dev)
{
return ERR_PTR(-ENETUNREACH);
}
#endif
#endif /* __LINUX_NET_VRF_H */

9
include/uapi/linux/if_link.h
View file

@ -341,6 +341,15 @@ enum macvlan_macaddr_mode {
#define MACVLAN_FLAG_NOPROMISC 1
/* VRF section */
enum {
IFLA_VRF_UNSPEC,
IFLA_VRF_TABLE,
__IFLA_VRF_MAX
};
#define IFLA_VRF_MAX (__IFLA_VRF_MAX - 1)
/* IPVLAN section */
enum {
IFLA_IPVLAN_UNSPEC,