blob: d90e4ef09e858050364f0822013cfe26752d035c [file] [log] [blame]
David Ahern1b69c6d2015-09-29 20:07:11 -07001/*
2 * net/l3mdev/l3mdev.c - L3 master device implementation
3 * Copyright (c) 2015 Cumulus Networks
4 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/netdevice.h>
David Ahern96c63fa2016-06-08 10:55:39 -070013#include <net/fib_rules.h>
David Ahern1b69c6d2015-09-29 20:07:11 -070014#include <net/l3mdev.h>
15
16/**
17 * l3mdev_master_ifindex - get index of L3 master device
18 * @dev: targeted interface
19 */
20
David Ahern3f2fb9a2016-02-24 11:47:02 -080021int l3mdev_master_ifindex_rcu(const struct net_device *dev)
David Ahern1b69c6d2015-09-29 20:07:11 -070022{
23 int ifindex = 0;
24
25 if (!dev)
26 return 0;
27
28 if (netif_is_l3_master(dev)) {
29 ifindex = dev->ifindex;
David Ahernfee6d4c2015-10-05 08:51:24 -070030 } else if (netif_is_l3_slave(dev)) {
David Ahern1b69c6d2015-09-29 20:07:11 -070031 struct net_device *master;
David Ahern3f2fb9a2016-02-24 11:47:02 -080032 struct net_device *_dev = (struct net_device *)dev;
David Ahern1b69c6d2015-09-29 20:07:11 -070033
David Ahern3f2fb9a2016-02-24 11:47:02 -080034 /* netdev_master_upper_dev_get_rcu calls
35 * list_first_or_null_rcu to walk the upper dev list.
36 * list_first_or_null_rcu does not handle a const arg. We aren't
37 * making changes, just want the master device from that list so
38 * typecast to remove the const
39 */
40 master = netdev_master_upper_dev_get_rcu(_dev);
David Ahernfee6d4c2015-10-05 08:51:24 -070041 if (master)
David Ahern1b69c6d2015-09-29 20:07:11 -070042 ifindex = master->ifindex;
43 }
44
45 return ifindex;
46}
47EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
48
49/**
50 * l3mdev_fib_table - get FIB table id associated with an L3
51 * master interface
52 * @dev: targeted interface
53 */
54
55u32 l3mdev_fib_table_rcu(const struct net_device *dev)
56{
57 u32 tb_id = 0;
58
59 if (!dev)
60 return 0;
61
62 if (netif_is_l3_master(dev)) {
63 if (dev->l3mdev_ops->l3mdev_fib_table)
64 tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
David Ahernfee6d4c2015-10-05 08:51:24 -070065 } else if (netif_is_l3_slave(dev)) {
David Ahern1b69c6d2015-09-29 20:07:11 -070066 /* Users of netdev_master_upper_dev_get_rcu need non-const,
67 * but current inet_*type functions take a const
68 */
69 struct net_device *_dev = (struct net_device *) dev;
70 const struct net_device *master;
71
72 master = netdev_master_upper_dev_get_rcu(_dev);
David Ahernfee6d4c2015-10-05 08:51:24 -070073 if (master &&
David Ahern1b69c6d2015-09-29 20:07:11 -070074 master->l3mdev_ops->l3mdev_fib_table)
75 tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
76 }
77
78 return tb_id;
79}
80EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
81
82u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
83{
84 struct net_device *dev;
85 u32 tb_id = 0;
86
87 if (!ifindex)
88 return 0;
89
90 rcu_read_lock();
91
92 dev = dev_get_by_index_rcu(net, ifindex);
93 if (dev)
94 tb_id = l3mdev_fib_table_rcu(dev);
95
96 rcu_read_unlock();
97
98 return tb_id;
99}
100EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
David Ahern4a658962016-05-07 16:48:59 -0700101
102/**
103 * l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
104 * cached route for L3 master device if relevant
105 * to flow
106 * @net: network namespace for device index lookup
107 * @fl6: IPv6 flow struct for lookup
108 */
109
110struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
David Aherncd2a9e62016-06-13 13:44:17 -0700111 struct flowi6 *fl6)
David Ahern4a658962016-05-07 16:48:59 -0700112{
113 struct dst_entry *dst = NULL;
114 struct net_device *dev;
115
David Ahern1ff23be2016-05-07 16:49:00 -0700116 if (fl6->flowi6_oif) {
117 rcu_read_lock();
118
119 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
120 if (dev && netif_is_l3_slave(dev))
121 dev = netdev_master_upper_dev_get_rcu(dev);
122
123 if (dev && netif_is_l3_master(dev) &&
David Ahern4a658962016-05-07 16:48:59 -0700124 dev->l3mdev_ops->l3mdev_get_rt6_dst)
125 dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
David Ahern1ff23be2016-05-07 16:49:00 -0700126
127 rcu_read_unlock();
David Ahern4a658962016-05-07 16:48:59 -0700128 }
129
130 return dst;
131}
132EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
133
134/**
135 * l3mdev_get_saddr - get source address for a flow based on an interface
136 * enslaved to an L3 master device
137 * @net: network namespace for device index lookup
138 * @ifindex: Interface index
139 * @fl4: IPv4 flow struct
140 */
141
142int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
143{
144 struct net_device *dev;
145 int rc = 0;
146
147 if (ifindex) {
148 rcu_read_lock();
149
150 dev = dev_get_by_index_rcu(net, ifindex);
David Ahern1ff23be2016-05-07 16:49:00 -0700151 if (dev && netif_is_l3_slave(dev))
152 dev = netdev_master_upper_dev_get_rcu(dev);
153
David Ahern4a658962016-05-07 16:48:59 -0700154 if (dev && netif_is_l3_master(dev) &&
155 dev->l3mdev_ops->l3mdev_get_saddr)
156 rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
157
158 rcu_read_unlock();
159 }
160
161 return rc;
162}
163EXPORT_SYMBOL_GPL(l3mdev_get_saddr);
David Ahern96c63fa2016-06-08 10:55:39 -0700164
165/**
166 * l3mdev_fib_rule_match - Determine if flowi references an
167 * L3 master device
168 * @net: network namespace for device index lookup
169 * @fl: flow struct
170 */
171
172int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
173 struct fib_lookup_arg *arg)
174{
175 struct net_device *dev;
176 int rc = 0;
177
178 rcu_read_lock();
179
180 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
181 if (dev && netif_is_l3_master(dev) &&
182 dev->l3mdev_ops->l3mdev_fib_table) {
183 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
184 rc = 1;
185 goto out;
186 }
187
188 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
189 if (dev && netif_is_l3_master(dev) &&
190 dev->l3mdev_ops->l3mdev_fib_table) {
191 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
192 rc = 1;
193 goto out;
194 }
195
196out:
197 rcu_read_unlock();
198
199 return rc;
200}