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 struct 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 .procname = "anycast_src_echo_reply", 29 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply, 30 .maxlen = sizeof(int), 31 .mode = 0644, 32 .proc_handler = proc_dointvec 33 }, 34 { 35 .procname = "flowlabel_consistency", 36 .data = &init_net.ipv6.sysctl.flowlabel_consistency, 37 .maxlen = sizeof(int), 38 .mode = 0644, 39 .proc_handler = proc_dointvec 40 }, 41 { 42 .procname = "auto_flowlabels", 43 .data = &init_net.ipv6.sysctl.auto_flowlabels, 44 .maxlen = sizeof(int), 45 .mode = 0644, 46 .proc_handler = proc_dointvec 47 }, 48 { 49 .procname = "fwmark_reflect", 50 .data = &init_net.ipv6.sysctl.fwmark_reflect, 51 .maxlen = sizeof(int), 52 .mode = 0644, 53 .proc_handler = proc_dointvec 54 }, 55 { } 56 }; 57 58 static struct ctl_table ipv6_rotable[] = { 59 { 60 .procname = "mld_max_msf", 61 .data = &sysctl_mld_max_msf, 62 .maxlen = sizeof(int), 63 .mode = 0644, 64 .proc_handler = proc_dointvec 65 }, 66 { } 67 }; 68 69 static int __net_init ipv6_sysctl_net_init(struct net *net) 70 { 71 struct ctl_table *ipv6_table; 72 struct ctl_table *ipv6_route_table; 73 struct ctl_table *ipv6_icmp_table; 74 int err; 75 76 err = -ENOMEM; 77 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 78 GFP_KERNEL); 79 if (!ipv6_table) 80 goto out; 81 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 82 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 83 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 84 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels; 85 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect; 86 87 ipv6_route_table = ipv6_route_sysctl_init(net); 88 if (!ipv6_route_table) 89 goto out_ipv6_table; 90 91 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 92 if (!ipv6_icmp_table) 93 goto out_ipv6_route_table; 94 95 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 96 if (!net->ipv6.sysctl.hdr) 97 goto out_ipv6_icmp_table; 98 99 net->ipv6.sysctl.route_hdr = 100 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 101 if (!net->ipv6.sysctl.route_hdr) 102 goto out_unregister_ipv6_table; 103 104 net->ipv6.sysctl.icmp_hdr = 105 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 106 if (!net->ipv6.sysctl.icmp_hdr) 107 goto out_unregister_route_table; 108 109 err = 0; 110 out: 111 return err; 112 out_unregister_route_table: 113 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 114 out_unregister_ipv6_table: 115 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 116 out_ipv6_icmp_table: 117 kfree(ipv6_icmp_table); 118 out_ipv6_route_table: 119 kfree(ipv6_route_table); 120 out_ipv6_table: 121 kfree(ipv6_table); 122 goto out; 123 } 124 125 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 126 { 127 struct ctl_table *ipv6_table; 128 struct ctl_table *ipv6_route_table; 129 struct ctl_table *ipv6_icmp_table; 130 131 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 132 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 133 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 134 135 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 136 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 137 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 138 139 kfree(ipv6_table); 140 kfree(ipv6_route_table); 141 kfree(ipv6_icmp_table); 142 } 143 144 static struct pernet_operations ipv6_sysctl_net_ops = { 145 .init = ipv6_sysctl_net_init, 146 .exit = ipv6_sysctl_net_exit, 147 }; 148 149 static struct ctl_table_header *ip6_header; 150 151 int ipv6_sysctl_register(void) 152 { 153 int err = -ENOMEM; 154 155 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 156 if (ip6_header == NULL) 157 goto out; 158 159 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 160 if (err) 161 goto err_pernet; 162 out: 163 return err; 164 165 err_pernet: 166 unregister_net_sysctl_table(ip6_header); 167 goto out; 168 } 169 170 void ipv6_sysctl_unregister(void) 171 { 172 unregister_net_sysctl_table(ip6_header); 173 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 174 } 175