rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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, struct net *net, |
| 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, net, 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 | { |
| 39 | int err; |
| 40 | |
| 41 | err = fib4_rules_dump(net, nb); |
| 42 | if (err) |
| 43 | return err; |
| 44 | |
| 45 | fib_notify(net, nb); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static const struct fib_notifier_ops fib4_notifier_ops_template = { |
| 51 | .family = AF_INET, |
| 52 | .fib_seq_read = fib4_seq_read, |
| 53 | .fib_dump = fib4_dump, |
| 54 | .owner = THIS_MODULE, |
| 55 | }; |
| 56 | |
| 57 | int __net_init fib4_notifier_init(struct net *net) |
| 58 | { |
| 59 | struct fib_notifier_ops *ops; |
| 60 | |
| 61 | net->ipv4.fib_seq = 0; |
| 62 | |
| 63 | ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net); |
| 64 | if (IS_ERR(ops)) |
| 65 | return PTR_ERR(ops); |
| 66 | net->ipv4.notifier_ops = ops; |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | void __net_exit fib4_notifier_exit(struct net *net) |
| 72 | { |
| 73 | fib_notifier_ops_unregister(net->ipv4.notifier_ops); |
| 74 | } |