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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_fib_table - get FIB table id associated with an L3
 51  *                             master interface
 52  *      @dev: targeted interface
 53  */
 54 
 55 u32 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);
 65         } else if (netif_is_l3_slave(dev)) {
 66                 /* 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);
 73                 if (master &&
 74                     master->l3mdev_ops->l3mdev_fib_table)
 75                         tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
 76         }
 77 
 78         return tb_id;
 79 }
 80 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
 81 
 82 u32 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 }
100 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
101 
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 
110 struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
111                                      struct flowi6 *fl6)
112 {
113         struct dst_entry *dst = NULL;
114         struct net_device *dev;
115 
116         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) &&
124                     dev->l3mdev_ops->l3mdev_get_rt6_dst)
125                         dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
126 
127                 rcu_read_unlock();
128         }
129 
130         return dst;
131 }
132 EXPORT_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 
142 int 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);
151                 if (dev && netif_is_l3_slave(dev))
152                         dev = netdev_master_upper_dev_get_rcu(dev);
153 
154                 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 }
163 EXPORT_SYMBOL_GPL(l3mdev_get_saddr);
164 
165 int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
166                       struct flowi6 *fl6)
167 {
168         struct net_device *dev;
169         int rc = 0;
170 
171         if (fl6->flowi6_oif) {
172                 rcu_read_lock();
173 
174                 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
175                 if (dev && netif_is_l3_slave(dev))
176                         dev = netdev_master_upper_dev_get_rcu(dev);
177 
178                 if (dev && netif_is_l3_master(dev) &&
179                     dev->l3mdev_ops->l3mdev_get_saddr6)
180                         rc = dev->l3mdev_ops->l3mdev_get_saddr6(dev, sk, fl6);
181 
182                 rcu_read_unlock();
183         }
184 
185         return rc;
186 }
187 EXPORT_SYMBOL_GPL(l3mdev_get_saddr6);
188 
189 /**
190  *      l3mdev_fib_rule_match - Determine if flowi references an
191  *                              L3 master device
192  *      @net: network namespace for device index lookup
193  *      @fl:  flow struct
194  */
195 
196 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
197                           struct fib_lookup_arg *arg)
198 {
199         struct net_device *dev;
200         int rc = 0;
201 
202         rcu_read_lock();
203 
204         dev = dev_get_by_index_rcu(net, fl->flowi_oif);
205         if (dev && netif_is_l3_master(dev) &&
206             dev->l3mdev_ops->l3mdev_fib_table) {
207                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
208                 rc = 1;
209                 goto out;
210         }
211 
212         dev = dev_get_by_index_rcu(net, fl->flowi_iif);
213         if (dev && netif_is_l3_master(dev) &&
214             dev->l3mdev_ops->l3mdev_fib_table) {
215                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
216                 rc = 1;
217                 goto out;
218         }
219 
220 out:
221         rcu_read_unlock();
222 
223         return rc;
224 }
225 

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