1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/rtnetlink.h> 3 #include <linux/notifier.h> 4 #include <linux/socket.h> 5 #include <linux/kernel.h> 6 #include <linux/export.h> 7 #include <net/net_namespace.h> 8 #include <net/fib_notifier.h> 9 #include <net/netns/ipv4.h> 10 #include <net/ip_fib.h> 11 12 int call_fib4_notifier(struct notifier_block *nb, 13 enum fib_event_type event_type, 14 struct fib_notifier_info *info) 15 { 16 info->family = AF_INET; 17 return call_fib_notifier(nb, event_type, info); 18 } 19 20 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 21 struct fib_notifier_info *info) 22 { 23 ASSERT_RTNL(); 24 25 info->family = AF_INET; 26 net->ipv4.fib_seq++; 27 return call_fib_notifiers(net, event_type, info); 28 } 29 30 static unsigned int fib4_seq_read(struct net *net) 31 { 32 ASSERT_RTNL(); 33 34 return net->ipv4.fib_seq + fib4_rules_seq_read(net); 35 } 36 37 static int fib4_dump(struct net *net, struct notifier_block *nb, 38 struct netlink_ext_ack *extack) 39 { 40 int err; 41 42 err = fib4_rules_dump(net, nb, extack); 43 if (err) 44 return err; 45 46 return fib_notify(net, nb, extack); 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