302 lines
6.6 KiB
C
302 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/l3mdev/l3mdev.c - L3 master device implementation
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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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#include <linux/netdevice.h>
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#include <net/fib_rules.h>
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#include <net/l3mdev.h>
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static DEFINE_SPINLOCK(l3mdev_lock);
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struct l3mdev_handler {
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lookup_by_table_id_t dev_lookup;
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};
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static struct l3mdev_handler l3mdev_handlers[L3MDEV_TYPE_MAX + 1];
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static int l3mdev_check_type(enum l3mdev_type l3type)
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{
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if (l3type <= L3MDEV_TYPE_UNSPEC || l3type > L3MDEV_TYPE_MAX)
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return -EINVAL;
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return 0;
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}
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int l3mdev_table_lookup_register(enum l3mdev_type l3type,
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lookup_by_table_id_t fn)
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{
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struct l3mdev_handler *hdlr;
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int res;
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res = l3mdev_check_type(l3type);
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if (res)
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return res;
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hdlr = &l3mdev_handlers[l3type];
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spin_lock(&l3mdev_lock);
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if (hdlr->dev_lookup) {
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res = -EBUSY;
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goto unlock;
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}
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hdlr->dev_lookup = fn;
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res = 0;
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unlock:
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spin_unlock(&l3mdev_lock);
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return res;
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}
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EXPORT_SYMBOL_GPL(l3mdev_table_lookup_register);
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void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
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lookup_by_table_id_t fn)
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{
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struct l3mdev_handler *hdlr;
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if (l3mdev_check_type(l3type))
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return;
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hdlr = &l3mdev_handlers[l3type];
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spin_lock(&l3mdev_lock);
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if (hdlr->dev_lookup == fn)
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hdlr->dev_lookup = NULL;
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spin_unlock(&l3mdev_lock);
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}
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EXPORT_SYMBOL_GPL(l3mdev_table_lookup_unregister);
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int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type,
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struct net *net, u32 table_id)
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{
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lookup_by_table_id_t lookup;
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struct l3mdev_handler *hdlr;
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int ifindex = -EINVAL;
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int res;
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res = l3mdev_check_type(l3type);
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if (res)
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return res;
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hdlr = &l3mdev_handlers[l3type];
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spin_lock(&l3mdev_lock);
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lookup = hdlr->dev_lookup;
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if (!lookup)
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goto unlock;
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ifindex = lookup(net, table_id);
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unlock:
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spin_unlock(&l3mdev_lock);
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return ifindex;
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}
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EXPORT_SYMBOL_GPL(l3mdev_ifindex_lookup_by_table_id);
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/**
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* l3mdev_master_ifindex_rcu - get index of L3 master device
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* @dev: targeted interface
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*/
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int l3mdev_master_ifindex_rcu(const struct net_device *dev)
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{
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int ifindex = 0;
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if (!dev)
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return 0;
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if (netif_is_l3_master(dev)) {
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ifindex = dev->ifindex;
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} else if (netif_is_l3_slave(dev)) {
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struct net_device *master;
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struct net_device *_dev = (struct net_device *)dev;
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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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master = netdev_master_upper_dev_get_rcu(_dev);
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if (master)
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ifindex = master->ifindex;
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}
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return ifindex;
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}
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EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
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/**
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* l3mdev_master_upper_ifindex_by_index_rcu - get index of upper l3 master
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* device
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* @net: network namespace for device index lookup
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* @ifindex: targeted interface
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*/
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int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
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{
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struct net_device *dev;
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dev = dev_get_by_index_rcu(net, ifindex);
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while (dev && !netif_is_l3_master(dev))
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dev = netdev_master_upper_dev_get_rcu(dev);
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return dev ? dev->ifindex : 0;
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}
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EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
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/**
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* l3mdev_fib_table_rcu - get FIB table id associated with an L3
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* master interface
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* @dev: targeted interface
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*/
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u32 l3mdev_fib_table_rcu(const struct net_device *dev)
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{
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u32 tb_id = 0;
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if (!dev)
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return 0;
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if (netif_is_l3_master(dev)) {
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if (dev->l3mdev_ops->l3mdev_fib_table)
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tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
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} else if (netif_is_l3_slave(dev)) {
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/* Users of netdev_master_upper_dev_get_rcu need non-const,
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* but current inet_*type functions take a 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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master = netdev_master_upper_dev_get_rcu(_dev);
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if (master &&
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master->l3mdev_ops->l3mdev_fib_table)
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tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
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}
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return tb_id;
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}
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EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
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u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
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{
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struct net_device *dev;
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u32 tb_id = 0;
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if (!ifindex)
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return 0;
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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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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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EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
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/**
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* l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
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* local and multicast addresses
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* @net: network namespace for device index lookup
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* @fl6: IPv6 flow struct for lookup
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* This function does not hold refcnt on the returned dst.
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* Caller must hold rcu_read_lock().
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*/
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struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
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struct flowi6 *fl6)
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{
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struct dst_entry *dst = NULL;
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struct net_device *dev;
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WARN_ON_ONCE(!rcu_read_lock_held());
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if (fl6->flowi6_oif) {
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dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
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if (dev && netif_is_l3_slave(dev))
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dev = netdev_master_upper_dev_get_rcu(dev);
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if (dev && netif_is_l3_master(dev) &&
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dev->l3mdev_ops->l3mdev_link_scope_lookup)
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dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
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}
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return dst;
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}
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EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
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/**
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* l3mdev_fib_rule_match - Determine if flowi references an
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* L3 master device
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* @net: network namespace for device index lookup
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* @fl: flow struct
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* @arg: store the table the rule matched with here
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*/
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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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struct net_device *dev;
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int rc = 0;
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/* update flow ensures flowi_l3mdev is set when relevant */
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if (!fl->flowi_l3mdev)
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return 0;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, fl->flowi_l3mdev);
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if (dev && netif_is_l3_master(dev) &&
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dev->l3mdev_ops->l3mdev_fib_table) {
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arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
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rc = 1;
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}
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rcu_read_unlock();
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return rc;
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}
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void l3mdev_update_flow(struct net *net, struct flowi *fl)
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{
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struct net_device *dev;
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rcu_read_lock();
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if (fl->flowi_oif) {
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dev = dev_get_by_index_rcu(net, fl->flowi_oif);
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if (dev) {
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if (!fl->flowi_l3mdev)
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fl->flowi_l3mdev = l3mdev_master_ifindex_rcu(dev);
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/* oif set to L3mdev directs lookup to its table;
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* reset to avoid oif match in fib_lookup
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*/
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if (netif_is_l3_master(dev))
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fl->flowi_oif = 0;
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goto out;
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}
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}
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if (fl->flowi_iif > LOOPBACK_IFINDEX && !fl->flowi_l3mdev) {
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dev = dev_get_by_index_rcu(net, fl->flowi_iif);
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if (dev)
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fl->flowi_l3mdev = l3mdev_master_ifindex_rcu(dev);
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}
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out:
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(l3mdev_update_flow);
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