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Linux/net/l3mdev/l3mdev.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/l3mdev/l3mdev.c - L3 master device implementation
  4  * Copyright (c) 2015 Cumulus Networks
  5  * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
  6  */
  7 
  8 #include <linux/netdevice.h>
  9 #include <net/fib_rules.h>
 10 #include <net/l3mdev.h>
 11 
 12 /**
 13  *      l3mdev_master_ifindex - get index of L3 master device
 14  *      @dev: targeted interface
 15  */
 16 
 17 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
 18 {
 19         int ifindex = 0;
 20 
 21         if (!dev)
 22                 return 0;
 23 
 24         if (netif_is_l3_master(dev)) {
 25                 ifindex = dev->ifindex;
 26         } else if (netif_is_l3_slave(dev)) {
 27                 struct net_device *master;
 28                 struct net_device *_dev = (struct net_device *)dev;
 29 
 30                 /* netdev_master_upper_dev_get_rcu calls
 31                  * list_first_or_null_rcu to walk the upper dev list.
 32                  * list_first_or_null_rcu does not handle a const arg. We aren't
 33                  * making changes, just want the master device from that list so
 34                  * typecast to remove the const
 35                  */
 36                 master = netdev_master_upper_dev_get_rcu(_dev);
 37                 if (master)
 38                         ifindex = master->ifindex;
 39         }
 40 
 41         return ifindex;
 42 }
 43 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
 44 
 45 /**
 46  *      l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
 47  *                                             device
 48  *      @net: network namespace for device index lookup
 49  *      @ifindex: targeted interface
 50  */
 51 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
 52 {
 53         struct net_device *dev;
 54 
 55         dev = dev_get_by_index_rcu(net, ifindex);
 56         while (dev && !netif_is_l3_master(dev))
 57                 dev = netdev_master_upper_dev_get(dev);
 58 
 59         return dev ? dev->ifindex : 0;
 60 }
 61 EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
 62 
 63 /**
 64  *      l3mdev_fib_table - get FIB table id associated with an L3
 65  *                             master interface
 66  *      @dev: targeted interface
 67  */
 68 
 69 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
 70 {
 71         u32 tb_id = 0;
 72 
 73         if (!dev)
 74                 return 0;
 75 
 76         if (netif_is_l3_master(dev)) {
 77                 if (dev->l3mdev_ops->l3mdev_fib_table)
 78                         tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
 79         } else if (netif_is_l3_slave(dev)) {
 80                 /* Users of netdev_master_upper_dev_get_rcu need non-const,
 81                  * but current inet_*type functions take a const
 82                  */
 83                 struct net_device *_dev = (struct net_device *) dev;
 84                 const struct net_device *master;
 85 
 86                 master = netdev_master_upper_dev_get_rcu(_dev);
 87                 if (master &&
 88                     master->l3mdev_ops->l3mdev_fib_table)
 89                         tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
 90         }
 91 
 92         return tb_id;
 93 }
 94 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
 95 
 96 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
 97 {
 98         struct net_device *dev;
 99         u32 tb_id = 0;
100 
101         if (!ifindex)
102                 return 0;
103 
104         rcu_read_lock();
105 
106         dev = dev_get_by_index_rcu(net, ifindex);
107         if (dev)
108                 tb_id = l3mdev_fib_table_rcu(dev);
109 
110         rcu_read_unlock();
111 
112         return tb_id;
113 }
114 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
115 
116 /**
117  *      l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
118  *                           local and multicast addresses
119  *      @net: network namespace for device index lookup
120  *      @fl6: IPv6 flow struct for lookup
121  *      This function does not hold refcnt on the returned dst.
122  *      Caller must hold rcu_read_lock().
123  */
124 
125 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
126                                            struct flowi6 *fl6)
127 {
128         struct dst_entry *dst = NULL;
129         struct net_device *dev;
130 
131         WARN_ON_ONCE(!rcu_read_lock_held());
132         if (fl6->flowi6_oif) {
133                 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
134                 if (dev && netif_is_l3_slave(dev))
135                         dev = netdev_master_upper_dev_get_rcu(dev);
136 
137                 if (dev && netif_is_l3_master(dev) &&
138                     dev->l3mdev_ops->l3mdev_link_scope_lookup)
139                         dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
140         }
141 
142         return dst;
143 }
144 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
145 
146 /**
147  *      l3mdev_fib_rule_match - Determine if flowi references an
148  *                              L3 master device
149  *      @net: network namespace for device index lookup
150  *      @fl:  flow struct
151  */
152 
153 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
154                           struct fib_lookup_arg *arg)
155 {
156         struct net_device *dev;
157         int rc = 0;
158 
159         rcu_read_lock();
160 
161         dev = dev_get_by_index_rcu(net, fl->flowi_oif);
162         if (dev && netif_is_l3_master(dev) &&
163             dev->l3mdev_ops->l3mdev_fib_table) {
164                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
165                 rc = 1;
166                 goto out;
167         }
168 
169         dev = dev_get_by_index_rcu(net, fl->flowi_iif);
170         if (dev && netif_is_l3_master(dev) &&
171             dev->l3mdev_ops->l3mdev_fib_table) {
172                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
173                 rc = 1;
174                 goto out;
175         }
176 
177 out:
178         rcu_read_unlock();
179 
180         return rc;
181 }
182 
183 void l3mdev_update_flow(struct net *net, struct flowi *fl)
184 {
185         struct net_device *dev;
186         int ifindex;
187 
188         rcu_read_lock();
189 
190         if (fl->flowi_oif) {
191                 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
192                 if (dev) {
193                         ifindex = l3mdev_master_ifindex_rcu(dev);
194                         if (ifindex) {
195                                 fl->flowi_oif = ifindex;
196                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
197                                 goto out;
198                         }
199                 }
200         }
201 
202         if (fl->flowi_iif) {
203                 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
204                 if (dev) {
205                         ifindex = l3mdev_master_ifindex_rcu(dev);
206                         if (ifindex) {
207                                 fl->flowi_iif = ifindex;
208                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
209                         }
210                 }
211         }
212 
213 out:
214         rcu_read_unlock();
215 }
216 EXPORT_SYMBOL_GPL(l3mdev_update_flow);
217 

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