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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_link_scope_lookup - IPv6 route lookup based on flow for link
104  *                           local and multicast addresses
105  *      @net: network namespace for device index lookup
106  *      @fl6: IPv6 flow struct for lookup
107  */
108 
109 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
110                                            struct flowi6 *fl6)
111 {
112         struct dst_entry *dst = NULL;
113         struct net_device *dev;
114 
115         if (fl6->flowi6_oif) {
116                 rcu_read_lock();
117 
118                 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
119                 if (dev && netif_is_l3_slave(dev))
120                         dev = netdev_master_upper_dev_get_rcu(dev);
121 
122                 if (dev && netif_is_l3_master(dev) &&
123                     dev->l3mdev_ops->l3mdev_link_scope_lookup)
124                         dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
125 
126                 rcu_read_unlock();
127         }
128 
129         return dst;
130 }
131 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
132 
133 /**
134  *      l3mdev_fib_rule_match - Determine if flowi references an
135  *                              L3 master device
136  *      @net: network namespace for device index lookup
137  *      @fl:  flow struct
138  */
139 
140 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
141                           struct fib_lookup_arg *arg)
142 {
143         struct net_device *dev;
144         int rc = 0;
145 
146         rcu_read_lock();
147 
148         dev = dev_get_by_index_rcu(net, fl->flowi_oif);
149         if (dev && netif_is_l3_master(dev) &&
150             dev->l3mdev_ops->l3mdev_fib_table) {
151                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
152                 rc = 1;
153                 goto out;
154         }
155 
156         dev = dev_get_by_index_rcu(net, fl->flowi_iif);
157         if (dev && netif_is_l3_master(dev) &&
158             dev->l3mdev_ops->l3mdev_fib_table) {
159                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
160                 rc = 1;
161                 goto out;
162         }
163 
164 out:
165         rcu_read_unlock();
166 
167         return rc;
168 }
169 
170 void l3mdev_update_flow(struct net *net, struct flowi *fl)
171 {
172         struct net_device *dev;
173         int ifindex;
174 
175         rcu_read_lock();
176 
177         if (fl->flowi_oif) {
178                 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
179                 if (dev) {
180                         ifindex = l3mdev_master_ifindex_rcu(dev);
181                         if (ifindex) {
182                                 fl->flowi_oif = ifindex;
183                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
184                                 goto out;
185                         }
186                 }
187         }
188 
189         if (fl->flowi_iif) {
190                 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
191                 if (dev) {
192                         ifindex = l3mdev_master_ifindex_rcu(dev);
193                         if (ifindex) {
194                                 fl->flowi_iif = ifindex;
195                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
196                         }
197                 }
198         }
199 
200 out:
201         rcu_read_unlock();
202 }
203 EXPORT_SYMBOL_GPL(l3mdev_update_flow);
204 

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