aboutsummaryrefslogtreecommitdiff
path: root/net/l3mdev/l3mdev.c
blob: 6651a78e100cdf987a5963fc84be5484221053ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*
 * net/l3mdev/l3mdev.c - L3 master device implementation
 * 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.
 */

#include <linux/netdevice.h>
#include <net/l3mdev.h>

/**
 *	l3mdev_master_ifindex - get index of L3 master device
 *	@dev: targeted interface
 */

int l3mdev_master_ifindex_rcu(const struct net_device *dev)
{
	int ifindex = 0;

	if (!dev)
		return 0;

	if (netif_is_l3_master(dev)) {
		ifindex = dev->ifindex;
	} else if (netif_is_l3_slave(dev)) {
		struct net_device *master;
		struct net_device *_dev = (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
		 */
		master = netdev_master_upper_dev_get_rcu(_dev);
		if (master)
			ifindex = master->ifindex;
	}

	return ifindex;
}
EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);

/**
 *	l3mdev_fib_table - get FIB table id associated with an L3
 *                             master interface
 *	@dev: targeted interface
 */

u32 l3mdev_fib_table_rcu(const struct net_device *dev)
{
	u32 tb_id = 0;

	if (!dev)
		return 0;

	if (netif_is_l3_master(dev)) {
		if (dev->l3mdev_ops->l3mdev_fib_table)
			tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
	} else if (netif_is_l3_slave(dev)) {
		/* Users of netdev_master_upper_dev_get_rcu need non-const,
		 * but current inet_*type functions take a const
		 */
		struct net_device *_dev = (struct net_device *) dev;
		const struct net_device *master;

		master = netdev_master_upper_dev_get_rcu(_dev);
		if (master &&
		    master->l3mdev_ops->l3mdev_fib_table)
			tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
	}

	return tb_id;
}
EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);

u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;
	u32 tb_id = 0;

	if (!ifindex)
		return 0;

	rcu_read_lock();

	dev = dev_get_by_index_rcu(net, ifindex);
	if (dev)
		tb_id = l3mdev_fib_table_rcu(dev);

	rcu_read_unlock();

	return tb_id;
}
EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);

/**
 *	l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
 *			     cached route for L3 master device if relevant
 *			     to flow
 *	@net: network namespace for device index lookup
 *	@fl6: IPv6 flow struct for lookup
 */

struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
				     const struct flowi6 *fl6)
{
	struct dst_entry *dst = NULL;
	struct net_device *dev;

	if (fl6->flowi6_oif) {
		rcu_read_lock();

		dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
		if (dev && netif_is_l3_slave(dev))
			dev = netdev_master_upper_dev_get_rcu(dev);

		if (dev && netif_is_l3_master(dev) &&
		    dev->l3mdev_ops->l3mdev_get_rt6_dst)
			dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);

		rcu_read_unlock();
	}

	return dst;
}
EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);

/**
 *	l3mdev_get_saddr - get source address for a flow based on an interface
 *			   enslaved to an L3 master device
 *	@net: network namespace for device index lookup
 *	@ifindex: Interface index
 *	@fl4: IPv4 flow struct
 */

int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
{
	struct net_device *dev;
	int rc = 0;

	if (ifindex) {
		rcu_read_lock();

		dev = dev_get_by_index_rcu(net, ifindex);
		if (dev && netif_is_l3_slave(dev))
			dev = netdev_master_upper_dev_get_rcu(dev);

		if (dev && netif_is_l3_master(dev) &&
		    dev->l3mdev_ops->l3mdev_get_saddr)
			rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);

		rcu_read_unlock();
	}

	return rc;
}
EXPORT_SYMBOL_GPL(l3mdev_get_saddr);