1 #include <linux/rtnetlink.h> 2 #include <linux/notifier.h> 3 #include <linux/socket.h> 4 #include <linux/kernel.h> 5 #include <linux/export.h> 6 #include <net/net_namespace.h> 7 #include <net/fib_notifier.h> 8 #include <net/netns/ipv4.h> 9 #include <net/ip_fib.h> 10 11 int call_fib4_notifier(struct notifier_block *nb, struct net *net, 12 enum fib_event_type event_type, 13 struct fib_notifier_info *info) 14 { 15 info->family = AF_INET; 16 return call_fib_notifier(nb, net, event_type, info); 17 } 18 19 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 20 struct fib_notifier_info *info) 21 { 22 ASSERT_RTNL(); 23 24 info->family = AF_INET; 25 net->ipv4.fib_seq++; 26 return call_fib_notifiers(net, event_type, info); 27 } 28 29 static unsigned int fib4_seq_read(struct net *net) 30 { 31 ASSERT_RTNL(); 32 33 return net->ipv4.fib_seq + fib4_rules_seq_read(net); 34 } 35 36 static int fib4_dump(struct net *net, struct notifier_block *nb) 37 { 38 int err; 39 40 err = fib4_rules_dump(net, nb); 41 if (err) 42 return err; 43 44 fib_notify(net, nb); 45 46 return 0; 47 } 48 49 static const struct fib_notifier_ops fib4_notifier_ops_template = { 50 .family = AF_INET, 51 .fib_seq_read = fib4_seq_read, 52 .fib_dump = fib4_dump, 53 .owner = THIS_MODULE, 54 }; 55 56 int __net_init fib4_notifier_init(struct net *net) 57 { 58 struct fib_notifier_ops *ops; 59 60 net->ipv4.fib_seq = 0; 61 62 ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net); 63 if (IS_ERR(ops)) 64 return PTR_ERR(ops); 65 net->ipv4.notifier_ops = ops; 66 67 return 0; 68 } 69 70 void __net_exit fib4_notifier_exit(struct net *net) 71 { 72 fib_notifier_ops_unregister(net->ipv4.notifier_ops); 73 } 74