afbac6010a
IPv6 version of 3f2fb9a834 ("net: l3mdev: address selection should only
consider devices in L3 domain") and the follow up commit, a17b693cdd876
("net: l3mdev: prefer VRF master for source address selection").
That is, if outbound device is given then the address preference order
is an address from that device, an address from the master device if it
is enslaved, and then an address from a device in the same L3 domain.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
296 lines
6.4 KiB
C
296 lines
6.4 KiB
C
/*
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* include/net/l3mdev.h - L3 master device API
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* Copyright (c) 2015 Cumulus Networks
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* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef _NET_L3MDEV_H_
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#define _NET_L3MDEV_H_
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#include <net/fib_rules.h>
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/**
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* struct l3mdev_ops - l3mdev operations
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*
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* @l3mdev_fib_table: Get FIB table id to use for lookups
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*
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* @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
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*
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* @l3mdev_get_saddr: Get source address for a flow
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*
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* @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
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*/
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struct l3mdev_ops {
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u32 (*l3mdev_fib_table)(const struct net_device *dev);
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struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
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struct sk_buff *skb, u16 proto);
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/* IPv4 ops */
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struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
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const struct flowi4 *fl4);
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int (*l3mdev_get_saddr)(struct net_device *dev,
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struct flowi4 *fl4);
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/* IPv6 ops */
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struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
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struct flowi6 *fl6);
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int (*l3mdev_get_saddr6)(struct net_device *dev,
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const struct sock *sk,
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struct flowi6 *fl6);
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};
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#ifdef CONFIG_NET_L3_MASTER_DEV
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int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
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struct fib_lookup_arg *arg);
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int l3mdev_master_ifindex_rcu(const struct net_device *dev);
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static inline int l3mdev_master_ifindex(struct net_device *dev)
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{
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int ifindex;
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rcu_read_lock();
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ifindex = l3mdev_master_ifindex_rcu(dev);
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rcu_read_unlock();
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return ifindex;
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}
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static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
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{
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struct net_device *dev;
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int rc = 0;
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if (likely(ifindex)) {
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifindex);
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if (dev)
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rc = l3mdev_master_ifindex_rcu(dev);
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rcu_read_unlock();
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}
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return rc;
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}
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static inline
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const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
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{
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/* netdev_master_upper_dev_get_rcu calls
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* list_first_or_null_rcu to walk the upper dev list.
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* list_first_or_null_rcu does not handle a const arg. We aren't
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* making changes, just want the master device from that list so
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* typecast to remove the const
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*/
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struct net_device *dev = (struct net_device *)_dev;
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const struct net_device *master;
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if (!dev)
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return NULL;
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if (netif_is_l3_master(dev))
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master = dev;
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else if (netif_is_l3_slave(dev))
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master = netdev_master_upper_dev_get_rcu(dev);
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else
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master = NULL;
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return master;
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}
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/* get index of an interface to use for FIB lookups. For devices
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* enslaved to an L3 master device FIB lookups are based on the
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* master index
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*/
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static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
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{
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return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
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}
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static inline int l3mdev_fib_oif(struct net_device *dev)
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{
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int oif;
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rcu_read_lock();
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oif = l3mdev_fib_oif_rcu(dev);
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rcu_read_unlock();
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return oif;
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}
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u32 l3mdev_fib_table_rcu(const struct net_device *dev);
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u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
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static inline u32 l3mdev_fib_table(const struct net_device *dev)
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{
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u32 tb_id;
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rcu_read_lock();
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tb_id = l3mdev_fib_table_rcu(dev);
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rcu_read_unlock();
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return tb_id;
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}
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static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
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const struct flowi4 *fl4)
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{
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if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
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return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
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return NULL;
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}
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static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
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{
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struct net_device *dev;
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bool rc = false;
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if (ifindex == 0)
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return false;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifindex);
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if (dev)
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rc = netif_is_l3_master(dev);
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rcu_read_unlock();
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return rc;
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}
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int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4);
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struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6);
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int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
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struct flowi6 *fl6);
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static inline
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struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
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{
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struct net_device *master = NULL;
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if (netif_is_l3_slave(skb->dev))
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master = netdev_master_upper_dev_get_rcu(skb->dev);
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else if (netif_is_l3_master(skb->dev))
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master = skb->dev;
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if (master && master->l3mdev_ops->l3mdev_l3_rcv)
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skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
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return skb;
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}
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static inline
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struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
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{
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return l3mdev_l3_rcv(skb, AF_INET);
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}
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static inline
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struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
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{
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return l3mdev_l3_rcv(skb, AF_INET6);
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}
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#else
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static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
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{
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return 0;
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}
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static inline int l3mdev_master_ifindex(struct net_device *dev)
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{
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return 0;
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}
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static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
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{
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return 0;
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}
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static inline
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const struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
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{
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return NULL;
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}
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static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
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{
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return dev ? dev->ifindex : 0;
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}
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static inline int l3mdev_fib_oif(struct net_device *dev)
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{
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return dev ? dev->ifindex : 0;
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}
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static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
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{
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return 0;
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}
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static inline u32 l3mdev_fib_table(const struct net_device *dev)
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{
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return 0;
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}
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static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
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{
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return 0;
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}
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static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
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const struct flowi4 *fl4)
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{
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return NULL;
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}
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static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
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{
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return false;
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}
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static inline int l3mdev_get_saddr(struct net *net, int ifindex,
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struct flowi4 *fl4)
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{
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return 0;
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}
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static inline
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struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6)
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{
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return NULL;
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}
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static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
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struct flowi6 *fl6)
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{
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return 0;
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}
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static inline
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struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
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{
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return skb;
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}
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static inline
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struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
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{
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return skb;
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}
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static inline
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int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
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struct fib_lookup_arg *arg)
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{
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return 1;
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}
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#endif
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#endif /* _NET_L3MDEV_H_ */
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