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Linux/net/l3mdev/l3mdev.c

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Diff markup

Differences between /net/l3mdev/l3mdev.c (Version linux-4.18.20) and /net/l3mdev/l3mdev.c (Version linux-4.10.17)


  1 /*                                                  1 /*
  2  * net/l3mdev/l3mdev.c - L3 master device impl      2  * net/l3mdev/l3mdev.c - L3 master device implementation
  3  * Copyright (c) 2015 Cumulus Networks              3  * Copyright (c) 2015 Cumulus Networks
  4  * Copyright (c) 2015 David Ahern <dsa@cumulus      4  * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
  5  *                                                  5  *
  6  * This program is free software; you can redi      6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Publi      7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either versio      8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.              9  * (at your option) any later version.
 10  */                                                10  */
 11                                                    11 
 12 #include <linux/netdevice.h>                       12 #include <linux/netdevice.h>
 13 #include <net/fib_rules.h>                         13 #include <net/fib_rules.h>
 14 #include <net/l3mdev.h>                            14 #include <net/l3mdev.h>
 15                                                    15 
 16 /**                                                16 /**
 17  *      l3mdev_master_ifindex - get index of L     17  *      l3mdev_master_ifindex - get index of L3 master device
 18  *      @dev: targeted interface                   18  *      @dev: targeted interface
 19  */                                                19  */
 20                                                    20 
 21 int l3mdev_master_ifindex_rcu(const struct net     21 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
 22 {                                                  22 {
 23         int ifindex = 0;                           23         int ifindex = 0;
 24                                                    24 
 25         if (!dev)                                  25         if (!dev)
 26                 return 0;                          26                 return 0;
 27                                                    27 
 28         if (netif_is_l3_master(dev)) {             28         if (netif_is_l3_master(dev)) {
 29                 ifindex = dev->ifindex;            29                 ifindex = dev->ifindex;
 30         } else if (netif_is_l3_slave(dev)) {       30         } else if (netif_is_l3_slave(dev)) {
 31                 struct net_device *master;         31                 struct net_device *master;
 32                 struct net_device *_dev = (str     32                 struct net_device *_dev = (struct net_device *)dev;
 33                                                    33 
 34                 /* netdev_master_upper_dev_get     34                 /* netdev_master_upper_dev_get_rcu calls
 35                  * list_first_or_null_rcu to w     35                  * list_first_or_null_rcu to walk the upper dev list.
 36                  * list_first_or_null_rcu does     36                  * list_first_or_null_rcu does not handle a const arg. We aren't
 37                  * making changes, just want t     37                  * making changes, just want the master device from that list so
 38                  * typecast to remove the cons     38                  * typecast to remove the const
 39                  */                                39                  */
 40                 master = netdev_master_upper_d     40                 master = netdev_master_upper_dev_get_rcu(_dev);
 41                 if (master)                        41                 if (master)
 42                         ifindex = master->ifin     42                         ifindex = master->ifindex;
 43         }                                          43         }
 44                                                    44 
 45         return ifindex;                            45         return ifindex;
 46 }                                                  46 }
 47 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);      47 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
 48                                                    48 
 49 /**                                                49 /**
 50  *      l3mdev_fib_table - get FIB table id as     50  *      l3mdev_fib_table - get FIB table id associated with an L3
 51  *                             master interfac     51  *                             master interface
 52  *      @dev: targeted interface                   52  *      @dev: targeted interface
 53  */                                                53  */
 54                                                    54 
 55 u32 l3mdev_fib_table_rcu(const struct net_devi     55 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
 56 {                                                  56 {
 57         u32 tb_id = 0;                             57         u32 tb_id = 0;
 58                                                    58 
 59         if (!dev)                                  59         if (!dev)
 60                 return 0;                          60                 return 0;
 61                                                    61 
 62         if (netif_is_l3_master(dev)) {             62         if (netif_is_l3_master(dev)) {
 63                 if (dev->l3mdev_ops->l3mdev_fi     63                 if (dev->l3mdev_ops->l3mdev_fib_table)
 64                         tb_id = dev->l3mdev_op     64                         tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
 65         } else if (netif_is_l3_slave(dev)) {       65         } else if (netif_is_l3_slave(dev)) {
 66                 /* Users of netdev_master_uppe     66                 /* Users of netdev_master_upper_dev_get_rcu need non-const,
 67                  * but current inet_*type func     67                  * but current inet_*type functions take a const
 68                  */                                68                  */
 69                 struct net_device *_dev = (str     69                 struct net_device *_dev = (struct net_device *) dev;
 70                 const struct net_device *maste     70                 const struct net_device *master;
 71                                                    71 
 72                 master = netdev_master_upper_d     72                 master = netdev_master_upper_dev_get_rcu(_dev);
 73                 if (master &&                      73                 if (master &&
 74                     master->l3mdev_ops->l3mdev     74                     master->l3mdev_ops->l3mdev_fib_table)
 75                         tb_id = master->l3mdev     75                         tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
 76         }                                          76         }
 77                                                    77 
 78         return tb_id;                              78         return tb_id;
 79 }                                                  79 }
 80 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);           80 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
 81                                                    81 
 82 u32 l3mdev_fib_table_by_index(struct net *net,     82 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
 83 {                                                  83 {
 84         struct net_device *dev;                    84         struct net_device *dev;
 85         u32 tb_id = 0;                             85         u32 tb_id = 0;
 86                                                    86 
 87         if (!ifindex)                              87         if (!ifindex)
 88                 return 0;                          88                 return 0;
 89                                                    89 
 90         rcu_read_lock();                           90         rcu_read_lock();
 91                                                    91 
 92         dev = dev_get_by_index_rcu(net, ifinde     92         dev = dev_get_by_index_rcu(net, ifindex);
 93         if (dev)                                   93         if (dev)
 94                 tb_id = l3mdev_fib_table_rcu(d     94                 tb_id = l3mdev_fib_table_rcu(dev);
 95                                                    95 
 96         rcu_read_unlock();                         96         rcu_read_unlock();
 97                                                    97 
 98         return tb_id;                              98         return tb_id;
 99 }                                                  99 }
100 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);     100 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
101                                                   101 
102 /**                                               102 /**
103  *      l3mdev_link_scope_lookup - IPv6 route     103  *      l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
104  *                           local and multica    104  *                           local and multicast addresses
105  *      @net: network namespace for device ind    105  *      @net: network namespace for device index lookup
106  *      @fl6: IPv6 flow struct for lookup         106  *      @fl6: IPv6 flow struct for lookup
107  */                                               107  */
108                                                   108 
109 struct dst_entry *l3mdev_link_scope_lookup(str    109 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
110                                            str    110                                            struct flowi6 *fl6)
111 {                                                 111 {
112         struct dst_entry *dst = NULL;             112         struct dst_entry *dst = NULL;
113         struct net_device *dev;                   113         struct net_device *dev;
114                                                   114 
115         if (fl6->flowi6_oif) {                    115         if (fl6->flowi6_oif) {
116                 rcu_read_lock();                  116                 rcu_read_lock();
117                                                   117 
118                 dev = dev_get_by_index_rcu(net    118                 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
119                 if (dev && netif_is_l3_slave(d    119                 if (dev && netif_is_l3_slave(dev))
120                         dev = netdev_master_up    120                         dev = netdev_master_upper_dev_get_rcu(dev);
121                                                   121 
122                 if (dev && netif_is_l3_master(    122                 if (dev && netif_is_l3_master(dev) &&
123                     dev->l3mdev_ops->l3mdev_li    123                     dev->l3mdev_ops->l3mdev_link_scope_lookup)
124                         dst = dev->l3mdev_ops-    124                         dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
125                                                   125 
126                 rcu_read_unlock();                126                 rcu_read_unlock();
127         }                                         127         }
128                                                   128 
129         return dst;                               129         return dst;
130 }                                                 130 }
131 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);      131 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
132                                                   132 
133 /**                                               133 /**
134  *      l3mdev_fib_rule_match - Determine if f    134  *      l3mdev_fib_rule_match - Determine if flowi references an
135  *                              L3 master devi    135  *                              L3 master device
136  *      @net: network namespace for device ind    136  *      @net: network namespace for device index lookup
137  *      @fl:  flow struct                         137  *      @fl:  flow struct
138  */                                               138  */
139                                                   139 
140 int l3mdev_fib_rule_match(struct net *net, str    140 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
141                           struct fib_lookup_ar    141                           struct fib_lookup_arg *arg)
142 {                                                 142 {
143         struct net_device *dev;                   143         struct net_device *dev;
144         int rc = 0;                               144         int rc = 0;
145                                                   145 
146         rcu_read_lock();                          146         rcu_read_lock();
147                                                   147 
148         dev = dev_get_by_index_rcu(net, fl->fl    148         dev = dev_get_by_index_rcu(net, fl->flowi_oif);
149         if (dev && netif_is_l3_master(dev) &&     149         if (dev && netif_is_l3_master(dev) &&
150             dev->l3mdev_ops->l3mdev_fib_table)    150             dev->l3mdev_ops->l3mdev_fib_table) {
151                 arg->table = dev->l3mdev_ops->    151                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
152                 rc = 1;                           152                 rc = 1;
153                 goto out;                         153                 goto out;
154         }                                         154         }
155                                                   155 
156         dev = dev_get_by_index_rcu(net, fl->fl    156         dev = dev_get_by_index_rcu(net, fl->flowi_iif);
157         if (dev && netif_is_l3_master(dev) &&     157         if (dev && netif_is_l3_master(dev) &&
158             dev->l3mdev_ops->l3mdev_fib_table)    158             dev->l3mdev_ops->l3mdev_fib_table) {
159                 arg->table = dev->l3mdev_ops->    159                 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
160                 rc = 1;                           160                 rc = 1;
161                 goto out;                         161                 goto out;
162         }                                         162         }
163                                                   163 
164 out:                                              164 out:
165         rcu_read_unlock();                        165         rcu_read_unlock();
166                                                   166 
167         return rc;                                167         return rc;
168 }                                                 168 }
169                                                   169 
170 void l3mdev_update_flow(struct net *net, struc    170 void l3mdev_update_flow(struct net *net, struct flowi *fl)
171 {                                                 171 {
172         struct net_device *dev;                   172         struct net_device *dev;
173         int ifindex;                              173         int ifindex;
174                                                   174 
175         rcu_read_lock();                          175         rcu_read_lock();
176                                                   176 
177         if (fl->flowi_oif) {                      177         if (fl->flowi_oif) {
178                 dev = dev_get_by_index_rcu(net    178                 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
179                 if (dev) {                        179                 if (dev) {
180                         ifindex = l3mdev_maste    180                         ifindex = l3mdev_master_ifindex_rcu(dev);
181                         if (ifindex) {            181                         if (ifindex) {
182                                 fl->flowi_oif     182                                 fl->flowi_oif = ifindex;
183                                 fl->flowi_flag    183                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
184                                 goto out;         184                                 goto out;
185                         }                         185                         }
186                 }                                 186                 }
187         }                                         187         }
188                                                   188 
189         if (fl->flowi_iif) {                      189         if (fl->flowi_iif) {
190                 dev = dev_get_by_index_rcu(net    190                 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
191                 if (dev) {                        191                 if (dev) {
192                         ifindex = l3mdev_maste    192                         ifindex = l3mdev_master_ifindex_rcu(dev);
193                         if (ifindex) {            193                         if (ifindex) {
194                                 fl->flowi_iif     194                                 fl->flowi_iif = ifindex;
195                                 fl->flowi_flag    195                                 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
196                         }                         196                         }
197                 }                                 197                 }
198         }                                         198         }
199                                                   199 
200 out:                                              200 out:
201         rcu_read_unlock();                        201         rcu_read_unlock();
202 }                                                 202 }
203 EXPORT_SYMBOL_GPL(l3mdev_update_flow);            203 EXPORT_SYMBOL_GPL(l3mdev_update_flow);
204                                                   204 

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