Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 1 | /* nf_sysctl.c netfilter sysctl registration/unregistation |
| 2 | * |
| 3 | * Copyright (c) 2006 Patrick McHardy <kaber@trash.net> |
| 4 | */ |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/sysctl.h> |
| 7 | #include <linux/string.h> |
| 8 | #include <linux/slab.h> |
| 9 | |
| 10 | static void |
| 11 | path_free(struct ctl_table *path, struct ctl_table *table) |
| 12 | { |
| 13 | struct ctl_table *t, *next; |
| 14 | |
| 15 | for (t = path; t != NULL && t != table; t = next) { |
| 16 | next = t->child; |
| 17 | kfree(t); |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | static struct ctl_table * |
| 22 | path_dup(struct ctl_table *path, struct ctl_table *table) |
| 23 | { |
| 24 | struct ctl_table *t, *last = NULL, *tmp; |
| 25 | |
| 26 | for (t = path; t != NULL; t = t->child) { |
| 27 | /* twice the size since path elements are terminated by an |
| 28 | * empty element */ |
| 29 | tmp = kmemdup(t, 2 * sizeof(*t), GFP_KERNEL); |
| 30 | if (tmp == NULL) { |
| 31 | if (last != NULL) |
| 32 | path_free(path, table); |
| 33 | return NULL; |
| 34 | } |
| 35 | |
| 36 | if (last != NULL) |
| 37 | last->child = tmp; |
| 38 | else |
| 39 | path = tmp; |
| 40 | last = tmp; |
| 41 | } |
| 42 | |
| 43 | if (last != NULL) |
| 44 | last->child = table; |
| 45 | else |
| 46 | path = table; |
| 47 | |
| 48 | return path; |
| 49 | } |
| 50 | |
| 51 | struct ctl_table_header * |
| 52 | nf_register_sysctl_table(struct ctl_table *path, struct ctl_table *table) |
| 53 | { |
| 54 | struct ctl_table_header *header; |
| 55 | |
| 56 | path = path_dup(path, table); |
| 57 | if (path == NULL) |
| 58 | return NULL; |
Eric W. Biederman | 0b4d414 | 2007-02-14 00:34:09 -0800 | [diff] [blame] | 59 | header = register_sysctl_table(path); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 60 | if (header == NULL) |
| 61 | path_free(path, table); |
| 62 | return header; |
| 63 | } |
| 64 | EXPORT_SYMBOL_GPL(nf_register_sysctl_table); |
| 65 | |
| 66 | void |
| 67 | nf_unregister_sysctl_table(struct ctl_table_header *header, |
| 68 | struct ctl_table *table) |
| 69 | { |
| 70 | struct ctl_table *path = header->ctl_table; |
| 71 | |
| 72 | unregister_sysctl_table(header); |
| 73 | path_free(path, table); |
| 74 | } |
| 75 | EXPORT_SYMBOL_GPL(nf_unregister_sysctl_table); |
| 76 | |
| 77 | /* net/netfilter */ |
| 78 | static struct ctl_table nf_net_netfilter_table[] = { |
| 79 | { |
| 80 | .ctl_name = NET_NETFILTER, |
| 81 | .procname = "netfilter", |
| 82 | .mode = 0555, |
| 83 | }, |
| 84 | { |
| 85 | .ctl_name = 0 |
| 86 | } |
| 87 | }; |
| 88 | struct ctl_table nf_net_netfilter_sysctl_path[] = { |
| 89 | { |
| 90 | .ctl_name = CTL_NET, |
| 91 | .procname = "net", |
| 92 | .mode = 0555, |
| 93 | .child = nf_net_netfilter_table, |
| 94 | }, |
| 95 | { |
| 96 | .ctl_name = 0 |
| 97 | } |
| 98 | }; |
| 99 | EXPORT_SYMBOL_GPL(nf_net_netfilter_sysctl_path); |
| 100 | |
| 101 | /* net/ipv4/netfilter */ |
| 102 | static struct ctl_table nf_net_ipv4_netfilter_table[] = { |
| 103 | { |
| 104 | .ctl_name = NET_IPV4_NETFILTER, |
| 105 | .procname = "netfilter", |
| 106 | .mode = 0555, |
| 107 | }, |
| 108 | { |
| 109 | .ctl_name = 0 |
| 110 | } |
| 111 | }; |
| 112 | static struct ctl_table nf_net_ipv4_table[] = { |
| 113 | { |
| 114 | .ctl_name = NET_IPV4, |
| 115 | .procname = "ipv4", |
| 116 | .mode = 0555, |
| 117 | .child = nf_net_ipv4_netfilter_table, |
| 118 | }, |
| 119 | { |
| 120 | .ctl_name = 0 |
| 121 | } |
| 122 | }; |
| 123 | struct ctl_table nf_net_ipv4_netfilter_sysctl_path[] = { |
| 124 | { |
| 125 | .ctl_name = CTL_NET, |
| 126 | .procname = "net", |
| 127 | .mode = 0555, |
| 128 | .child = nf_net_ipv4_table, |
| 129 | }, |
| 130 | { |
| 131 | .ctl_name = 0 |
| 132 | } |
| 133 | }; |
| 134 | EXPORT_SYMBOL_GPL(nf_net_ipv4_netfilter_sysctl_path); |