| 1 | /* |
| 2 | * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem. |
| 3 | * |
| 4 | * Changes: |
| 5 | * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table. |
| 6 | */ |
| 7 | |
| 8 | #include <linux/mm.h> |
| 9 | #include <linux/sysctl.h> |
| 10 | #include <linux/in6.h> |
| 11 | #include <linux/ipv6.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/export.h> |
| 14 | #include <net/ndisc.h> |
| 15 | #include <net/ipv6.h> |
| 16 | #include <net/addrconf.h> |
| 17 | #include <net/inet_frag.h> |
| 18 | |
| 19 | static ctl_table ipv6_table_template[] = { |
| 20 | { |
| 21 | .procname = "bindv6only", |
| 22 | .data = &init_net.ipv6.sysctl.bindv6only, |
| 23 | .maxlen = sizeof(int), |
| 24 | .mode = 0644, |
| 25 | .proc_handler = proc_dointvec |
| 26 | }, |
| 27 | { } |
| 28 | }; |
| 29 | |
| 30 | static ctl_table ipv6_rotable[] = { |
| 31 | { |
| 32 | .procname = "mld_max_msf", |
| 33 | .data = &sysctl_mld_max_msf, |
| 34 | .maxlen = sizeof(int), |
| 35 | .mode = 0644, |
| 36 | .proc_handler = proc_dointvec |
| 37 | }, |
| 38 | { } |
| 39 | }; |
| 40 | |
| 41 | static int __net_init ipv6_sysctl_net_init(struct net *net) |
| 42 | { |
| 43 | struct ctl_table *ipv6_table; |
| 44 | struct ctl_table *ipv6_route_table; |
| 45 | struct ctl_table *ipv6_icmp_table; |
| 46 | int err; |
| 47 | |
| 48 | err = -ENOMEM; |
| 49 | ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), |
| 50 | GFP_KERNEL); |
| 51 | if (!ipv6_table) |
| 52 | goto out; |
| 53 | ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; |
| 54 | |
| 55 | ipv6_route_table = ipv6_route_sysctl_init(net); |
| 56 | if (!ipv6_route_table) |
| 57 | goto out_ipv6_table; |
| 58 | |
| 59 | ipv6_icmp_table = ipv6_icmp_sysctl_init(net); |
| 60 | if (!ipv6_icmp_table) |
| 61 | goto out_ipv6_route_table; |
| 62 | |
| 63 | net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); |
| 64 | if (!net->ipv6.sysctl.hdr) |
| 65 | goto out_ipv6_icmp_table; |
| 66 | |
| 67 | net->ipv6.sysctl.route_hdr = |
| 68 | register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); |
| 69 | if (!net->ipv6.sysctl.route_hdr) |
| 70 | goto out_unregister_ipv6_table; |
| 71 | |
| 72 | net->ipv6.sysctl.icmp_hdr = |
| 73 | register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); |
| 74 | if (!net->ipv6.sysctl.icmp_hdr) |
| 75 | goto out_unregister_route_table; |
| 76 | |
| 77 | err = 0; |
| 78 | out: |
| 79 | return err; |
| 80 | out_unregister_route_table: |
| 81 | unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); |
| 82 | out_unregister_ipv6_table: |
| 83 | unregister_net_sysctl_table(net->ipv6.sysctl.hdr); |
| 84 | out_ipv6_icmp_table: |
| 85 | kfree(ipv6_icmp_table); |
| 86 | out_ipv6_route_table: |
| 87 | kfree(ipv6_route_table); |
| 88 | out_ipv6_table: |
| 89 | kfree(ipv6_table); |
| 90 | goto out; |
| 91 | } |
| 92 | |
| 93 | static void __net_exit ipv6_sysctl_net_exit(struct net *net) |
| 94 | { |
| 95 | struct ctl_table *ipv6_table; |
| 96 | struct ctl_table *ipv6_route_table; |
| 97 | struct ctl_table *ipv6_icmp_table; |
| 98 | |
| 99 | ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; |
| 100 | ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; |
| 101 | ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; |
| 102 | |
| 103 | unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); |
| 104 | unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); |
| 105 | unregister_net_sysctl_table(net->ipv6.sysctl.hdr); |
| 106 | |
| 107 | kfree(ipv6_table); |
| 108 | kfree(ipv6_route_table); |
| 109 | kfree(ipv6_icmp_table); |
| 110 | } |
| 111 | |
| 112 | static struct pernet_operations ipv6_sysctl_net_ops = { |
| 113 | .init = ipv6_sysctl_net_init, |
| 114 | .exit = ipv6_sysctl_net_exit, |
| 115 | }; |
| 116 | |
| 117 | static struct ctl_table_header *ip6_header; |
| 118 | |
| 119 | int ipv6_sysctl_register(void) |
| 120 | { |
| 121 | int err = -ENOMEM; |
| 122 | |
| 123 | ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); |
| 124 | if (ip6_header == NULL) |
| 125 | goto out; |
| 126 | |
| 127 | err = register_pernet_subsys(&ipv6_sysctl_net_ops); |
| 128 | if (err) |
| 129 | goto err_pernet; |
| 130 | out: |
| 131 | return err; |
| 132 | |
| 133 | err_pernet: |
| 134 | unregister_net_sysctl_table(ip6_header); |
| 135 | goto out; |
| 136 | } |
| 137 | |
| 138 | void ipv6_sysctl_unregister(void) |
| 139 | { |
| 140 | unregister_net_sysctl_table(ip6_header); |
| 141 | unregister_pernet_subsys(&ipv6_sysctl_net_ops); |
| 142 | } |