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Linux/net/l3mdev/l3mdev.c

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  1 /*
  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>
 13 #include <net/fib_rules.h>
 14 #include <net/l3mdev.h>
 15 
 16 /**
 17  *      l3mdev_master_ifindex - get index of L3 master device
 18  *      @dev: targeted interface
 19  */
 20 
 21 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
 22 {
 23         int ifindex = 0;
 24 
 25         if (!dev)
 26                 return 0;
 27 
 28         if (netif_is_l3_master(dev)) {
 29                 ifindex = dev->ifindex;
 30         } else if (netif_is_l3_slave(dev)) {
 31                 struct net_device *master;
 32                 struct net_device *_dev = (struct net_device *)dev;
 33 
 34                 /* 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);
 41                 if (master)
 42                         ifindex = master->ifindex;
 43         }
 44 
 45         return ifindex;
 46 }
 47 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
 48 
 49 /**
 50  *      l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
 51  *                                             device
 52  *      @net: network namespace for device index lookup
 53  *      @ifindex: targeted interface
 54  */
 55 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
 56 {
 57         struct net_device *dev;
 58 
 59         dev = dev_get_by_index_rcu(net, ifindex);
 60         while (dev && !netif_is_l3_master(dev))
 61                 dev = netdev_master_upper_dev_get(dev);
 62 
 63         return dev ? dev->ifindex : 0;
 64 }
 65 EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
 66 
 67 /**
 68  *      l3mdev_fib_table - get FIB table id associated with an L3
 69  *                             master interface
 70  *      @dev: targeted interface
 71  */
 72 
 73 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
 74 {
 75         u32 tb_id = 0;
 76 
 77         if (!dev)
 78                 return 0;
 79 
 80         if (netif_is_l3_master(dev)) {
 81                 if (dev->l3mdev_ops->l3mdev_fib_table)
 82                         tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
 83         } else if (netif_is_l3_slave(dev)) {
 84                 /* Users of netdev_master_upper_dev_get_rcu need non-const,
 85                  * but current inet_*type functions take a const
 86                  */
 87                 struct net_device *_dev = (struct net_device *) dev;
 88                 const struct net_device *master;
 89 
 90                 master = netdev_master_upper_dev_get_rcu(_dev);
 91                 if (master &&
 92                     master->l3mdev_ops->l3mdev_fib_table)
 93                         tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
 94         }
 95 
 96         return tb_id;
 97 }
 98 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
 99 
100 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
101 {
102         struct net_device *dev;
103         u32 tb_id = 0;
104 
105         if (!ifindex)
106                 return 0;
107 
108         rcu_read_lock();
109 
110         dev = dev_get_by_index_rcu(net, ifindex);
111         if (dev)
112                 tb_id = l3mdev_fib_table_rcu(dev);
113 
114         rcu_read_unlock();
115 
116         return tb_id;
117 }
118 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
119 
120 /**
121  *      l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
122  *                           local and multicast addresses
123  *      @net: network namespace for device index lookup
124  *      @fl6: IPv6 flow struct for lookup
125  */
126 
127 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
128                                            struct flowi6 *fl6)
129 {
130         struct dst_entry *dst = NULL;
131         struct net_device *dev;
132 
133         if (fl6->flowi6_oif) {
134                 rcu_read_lock();
135 
136                 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
137                 if (dev && netif_is_l3_slave(dev))
138                         dev = netdev_master_upper_dev_get_rcu(dev);
139 
140                 if (dev && netif_is_l3_master(dev) &&
141                     dev->l3mdev_ops->l3mdev_link_scope_lookup)
142                         dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
143 
144                 rcu_read_unlock();
145         }
146 
147         return dst;
148 }
149 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
150 
151 /**
152  *      l3mdev_fib_rule_match - Determine if flowi references an
153  *                              L3 master device
154  *      @net: network namespace for device index lookup
155  *      @fl:  flow struct
156  */
157 
158 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
159                           struct fib_lookup_arg *arg)
160 {
161         struct net_device *dev;
162         int rc = 0;
163 
164         rcu_read_lock();
165 
166         dev = dev_get_by_index_rcu(net, fl->flowi_oif);
167         if (dev && netif_is_l3_master(dev) &&
168             dev->l3mdev_ops->l3mdev_fib_table) {
169                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
170                 rc = 1;
171                 goto out;
172         }
173 
174         dev = dev_get_by_index_rcu(net, fl->flowi_iif);
175         if (dev && netif_is_l3_master(dev) &&
176             dev->l3mdev_ops->l3mdev_fib_table) {
177                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
178                 rc = 1;
179                 goto out;
180         }
181 
182 out:
183         rcu_read_unlock();
184 
185         return rc;
186 }
187 
188 void l3mdev_update_flow(struct net *net, struct flowi *fl)
189 {
190         struct net_device *dev;
191         int ifindex;
192 
193         rcu_read_lock();
194 
195         if (fl->flowi_oif) {
196                 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
197                 if (dev) {
198                         ifindex = l3mdev_master_ifindex_rcu(dev);
199                         if (ifindex) {
200                                 fl->flowi_oif = ifindex;
201                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
202                                 goto out;
203                         }
204                 }
205         }
206 
207         if (fl->flowi_iif) {
208                 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
209                 if (dev) {
210                         ifindex = l3mdev_master_ifindex_rcu(dev);
211                         if (ifindex) {
212                                 fl->flowi_iif = ifindex;
213                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
214                         }
215                 }
216         }
217 
218 out:
219         rcu_read_unlock();
220 }
221 EXPORT_SYMBOL_GPL(l3mdev_update_flow);
222 

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