Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1 | /* |
| 2 | * x_tables core - Backend for {ip,ip6,arp}_tables |
| 3 | * |
| 4 | * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> |
| 5 | * |
| 6 | * Based on existing ip_tables code which is |
| 7 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
| 8 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/config.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/socket.h> |
| 19 | #include <linux/net.h> |
| 20 | #include <linux/proc_fs.h> |
| 21 | #include <linux/seq_file.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/vmalloc.h> |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 24 | #include <linux/mutex.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 25 | |
| 26 | #include <linux/netfilter/x_tables.h> |
| 27 | #include <linux/netfilter_arp.h> |
| 28 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 29 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 30 | MODULE_LICENSE("GPL"); |
| 31 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 32 | MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module"); |
| 33 | |
| 34 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) |
| 35 | |
| 36 | struct xt_af { |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 37 | struct mutex mutex; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 38 | struct list_head match; |
| 39 | struct list_head target; |
| 40 | struct list_head tables; |
| 41 | }; |
| 42 | |
| 43 | static struct xt_af *xt; |
| 44 | |
| 45 | #ifdef DEBUG_IP_FIREWALL_USER |
| 46 | #define duprintf(format, args...) printk(format , ## args) |
| 47 | #else |
| 48 | #define duprintf(format, args...) |
| 49 | #endif |
| 50 | |
| 51 | enum { |
| 52 | TABLE, |
| 53 | TARGET, |
| 54 | MATCH, |
| 55 | }; |
| 56 | |
Patrick McHardy | 37f9f73 | 2006-03-20 17:59:06 -0800 | [diff] [blame] | 57 | static const char *xt_prefix[NPROTO] = { |
| 58 | [AF_INET] = "ip", |
| 59 | [AF_INET6] = "ip6", |
| 60 | [NF_ARP] = "arp", |
| 61 | }; |
| 62 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 63 | /* Registration hooks for targets. */ |
| 64 | int |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 65 | xt_register_target(struct xt_target *target) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 66 | { |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 67 | int ret, af = target->family; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 68 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 69 | ret = mutex_lock_interruptible(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 70 | if (ret != 0) |
| 71 | return ret; |
| 72 | list_add(&target->list, &xt[af].target); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 73 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 74 | return ret; |
| 75 | } |
| 76 | EXPORT_SYMBOL(xt_register_target); |
| 77 | |
| 78 | void |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 79 | xt_unregister_target(struct xt_target *target) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 80 | { |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 81 | int af = target->family; |
| 82 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 83 | mutex_lock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 84 | LIST_DELETE(&xt[af].target, target); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 85 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 86 | } |
| 87 | EXPORT_SYMBOL(xt_unregister_target); |
| 88 | |
| 89 | int |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 90 | xt_register_match(struct xt_match *match) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 91 | { |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 92 | int ret, af = match->family; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 93 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 94 | ret = mutex_lock_interruptible(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 95 | if (ret != 0) |
| 96 | return ret; |
| 97 | |
| 98 | list_add(&match->list, &xt[af].match); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 99 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 100 | |
| 101 | return ret; |
| 102 | } |
| 103 | EXPORT_SYMBOL(xt_register_match); |
| 104 | |
| 105 | void |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 106 | xt_unregister_match(struct xt_match *match) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 107 | { |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 108 | int af = match->family; |
| 109 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 110 | mutex_lock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 111 | LIST_DELETE(&xt[af].match, match); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 112 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 113 | } |
| 114 | EXPORT_SYMBOL(xt_unregister_match); |
| 115 | |
| 116 | |
| 117 | /* |
| 118 | * These are weird, but module loading must not be done with mutex |
| 119 | * held (since they will register), and we have to have a single |
| 120 | * function to use try_then_request_module(). |
| 121 | */ |
| 122 | |
| 123 | /* Find match, grabs ref. Returns ERR_PTR() on error. */ |
| 124 | struct xt_match *xt_find_match(int af, const char *name, u8 revision) |
| 125 | { |
| 126 | struct xt_match *m; |
| 127 | int err = 0; |
| 128 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 129 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 130 | return ERR_PTR(-EINTR); |
| 131 | |
| 132 | list_for_each_entry(m, &xt[af].match, list) { |
| 133 | if (strcmp(m->name, name) == 0) { |
| 134 | if (m->revision == revision) { |
| 135 | if (try_module_get(m->me)) { |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 136 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 137 | return m; |
| 138 | } |
| 139 | } else |
| 140 | err = -EPROTOTYPE; /* Found something. */ |
| 141 | } |
| 142 | } |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 143 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 144 | return ERR_PTR(err); |
| 145 | } |
| 146 | EXPORT_SYMBOL(xt_find_match); |
| 147 | |
| 148 | /* Find target, grabs ref. Returns ERR_PTR() on error. */ |
| 149 | struct xt_target *xt_find_target(int af, const char *name, u8 revision) |
| 150 | { |
| 151 | struct xt_target *t; |
| 152 | int err = 0; |
| 153 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 154 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 155 | return ERR_PTR(-EINTR); |
| 156 | |
| 157 | list_for_each_entry(t, &xt[af].target, list) { |
| 158 | if (strcmp(t->name, name) == 0) { |
| 159 | if (t->revision == revision) { |
| 160 | if (try_module_get(t->me)) { |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 161 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 162 | return t; |
| 163 | } |
| 164 | } else |
| 165 | err = -EPROTOTYPE; /* Found something. */ |
| 166 | } |
| 167 | } |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 168 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 169 | return ERR_PTR(err); |
| 170 | } |
| 171 | EXPORT_SYMBOL(xt_find_target); |
| 172 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 173 | struct xt_target *xt_request_find_target(int af, const char *name, u8 revision) |
| 174 | { |
| 175 | struct xt_target *target; |
| 176 | |
| 177 | target = try_then_request_module(xt_find_target(af, name, revision), |
Patrick McHardy | 37f9f73 | 2006-03-20 17:59:06 -0800 | [diff] [blame] | 178 | "%st_%s", xt_prefix[af], name); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 179 | if (IS_ERR(target) || !target) |
| 180 | return NULL; |
| 181 | return target; |
| 182 | } |
| 183 | EXPORT_SYMBOL_GPL(xt_request_find_target); |
| 184 | |
| 185 | static int match_revfn(int af, const char *name, u8 revision, int *bestp) |
| 186 | { |
| 187 | struct xt_match *m; |
| 188 | int have_rev = 0; |
| 189 | |
| 190 | list_for_each_entry(m, &xt[af].match, list) { |
| 191 | if (strcmp(m->name, name) == 0) { |
| 192 | if (m->revision > *bestp) |
| 193 | *bestp = m->revision; |
| 194 | if (m->revision == revision) |
| 195 | have_rev = 1; |
| 196 | } |
| 197 | } |
| 198 | return have_rev; |
| 199 | } |
| 200 | |
| 201 | static int target_revfn(int af, const char *name, u8 revision, int *bestp) |
| 202 | { |
| 203 | struct xt_target *t; |
| 204 | int have_rev = 0; |
| 205 | |
| 206 | list_for_each_entry(t, &xt[af].target, list) { |
| 207 | if (strcmp(t->name, name) == 0) { |
| 208 | if (t->revision > *bestp) |
| 209 | *bestp = t->revision; |
| 210 | if (t->revision == revision) |
| 211 | have_rev = 1; |
| 212 | } |
| 213 | } |
| 214 | return have_rev; |
| 215 | } |
| 216 | |
| 217 | /* Returns true or false (if no such extension at all) */ |
| 218 | int xt_find_revision(int af, const char *name, u8 revision, int target, |
| 219 | int *err) |
| 220 | { |
| 221 | int have_rev, best = -1; |
| 222 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 223 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 224 | *err = -EINTR; |
| 225 | return 1; |
| 226 | } |
| 227 | if (target == 1) |
| 228 | have_rev = target_revfn(af, name, revision, &best); |
| 229 | else |
| 230 | have_rev = match_revfn(af, name, revision, &best); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 231 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 232 | |
| 233 | /* Nothing at all? Return 0 to try loading module. */ |
| 234 | if (best == -1) { |
| 235 | *err = -ENOENT; |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | *err = best; |
| 240 | if (!have_rev) |
| 241 | *err = -EPROTONOSUPPORT; |
| 242 | return 1; |
| 243 | } |
| 244 | EXPORT_SYMBOL_GPL(xt_find_revision); |
| 245 | |
Patrick McHardy | 37f9f73 | 2006-03-20 17:59:06 -0800 | [diff] [blame] | 246 | int xt_check_match(const struct xt_match *match, unsigned short family, |
| 247 | unsigned int size, const char *table, unsigned int hook_mask, |
| 248 | unsigned short proto, int inv_proto) |
| 249 | { |
| 250 | if (XT_ALIGN(match->matchsize) != size) { |
| 251 | printk("%s_tables: %s match: invalid size %Zu != %u\n", |
| 252 | xt_prefix[family], match->name, |
| 253 | XT_ALIGN(match->matchsize), size); |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | if (match->table && strcmp(match->table, table)) { |
| 257 | printk("%s_tables: %s match: only valid in %s table, not %s\n", |
| 258 | xt_prefix[family], match->name, match->table, table); |
| 259 | return -EINVAL; |
| 260 | } |
| 261 | if (match->hooks && (hook_mask & ~match->hooks) != 0) { |
| 262 | printk("%s_tables: %s match: bad hook_mask %u\n", |
| 263 | xt_prefix[family], match->name, hook_mask); |
| 264 | return -EINVAL; |
| 265 | } |
| 266 | if (match->proto && (match->proto != proto || inv_proto)) { |
| 267 | printk("%s_tables: %s match: only valid for protocol %u\n", |
| 268 | xt_prefix[family], match->name, match->proto); |
| 269 | return -EINVAL; |
| 270 | } |
| 271 | return 0; |
| 272 | } |
| 273 | EXPORT_SYMBOL_GPL(xt_check_match); |
| 274 | |
| 275 | int xt_check_target(const struct xt_target *target, unsigned short family, |
| 276 | unsigned int size, const char *table, unsigned int hook_mask, |
| 277 | unsigned short proto, int inv_proto) |
| 278 | { |
| 279 | if (XT_ALIGN(target->targetsize) != size) { |
| 280 | printk("%s_tables: %s target: invalid size %Zu != %u\n", |
| 281 | xt_prefix[family], target->name, |
| 282 | XT_ALIGN(target->targetsize), size); |
| 283 | return -EINVAL; |
| 284 | } |
| 285 | if (target->table && strcmp(target->table, table)) { |
| 286 | printk("%s_tables: %s target: only valid in %s table, not %s\n", |
| 287 | xt_prefix[family], target->name, target->table, table); |
| 288 | return -EINVAL; |
| 289 | } |
| 290 | if (target->hooks && (hook_mask & ~target->hooks) != 0) { |
| 291 | printk("%s_tables: %s target: bad hook_mask %u\n", |
| 292 | xt_prefix[family], target->name, hook_mask); |
| 293 | return -EINVAL; |
| 294 | } |
| 295 | if (target->proto && (target->proto != proto || inv_proto)) { |
| 296 | printk("%s_tables: %s target: only valid for protocol %u\n", |
| 297 | xt_prefix[family], target->name, target->proto); |
| 298 | return -EINVAL; |
| 299 | } |
| 300 | return 0; |
| 301 | } |
| 302 | EXPORT_SYMBOL_GPL(xt_check_target); |
| 303 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 304 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
| 305 | { |
| 306 | struct xt_table_info *newinfo; |
| 307 | int cpu; |
| 308 | |
| 309 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ |
| 310 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages) |
| 311 | return NULL; |
| 312 | |
| 313 | newinfo = kzalloc(sizeof(struct xt_table_info), GFP_KERNEL); |
| 314 | if (!newinfo) |
| 315 | return NULL; |
| 316 | |
| 317 | newinfo->size = size; |
| 318 | |
| 319 | for_each_cpu(cpu) { |
| 320 | if (size <= PAGE_SIZE) |
| 321 | newinfo->entries[cpu] = kmalloc_node(size, |
| 322 | GFP_KERNEL, |
| 323 | cpu_to_node(cpu)); |
| 324 | else |
| 325 | newinfo->entries[cpu] = vmalloc_node(size, |
| 326 | cpu_to_node(cpu)); |
| 327 | |
| 328 | if (newinfo->entries[cpu] == NULL) { |
| 329 | xt_free_table_info(newinfo); |
| 330 | return NULL; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | return newinfo; |
| 335 | } |
| 336 | EXPORT_SYMBOL(xt_alloc_table_info); |
| 337 | |
| 338 | void xt_free_table_info(struct xt_table_info *info) |
| 339 | { |
| 340 | int cpu; |
| 341 | |
| 342 | for_each_cpu(cpu) { |
| 343 | if (info->size <= PAGE_SIZE) |
| 344 | kfree(info->entries[cpu]); |
| 345 | else |
| 346 | vfree(info->entries[cpu]); |
| 347 | } |
| 348 | kfree(info); |
| 349 | } |
| 350 | EXPORT_SYMBOL(xt_free_table_info); |
| 351 | |
| 352 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ |
| 353 | struct xt_table *xt_find_table_lock(int af, const char *name) |
| 354 | { |
| 355 | struct xt_table *t; |
| 356 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 357 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 358 | return ERR_PTR(-EINTR); |
| 359 | |
| 360 | list_for_each_entry(t, &xt[af].tables, list) |
| 361 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
| 362 | return t; |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 363 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 364 | return NULL; |
| 365 | } |
| 366 | EXPORT_SYMBOL_GPL(xt_find_table_lock); |
| 367 | |
| 368 | void xt_table_unlock(struct xt_table *table) |
| 369 | { |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 370 | mutex_unlock(&xt[table->af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 371 | } |
| 372 | EXPORT_SYMBOL_GPL(xt_table_unlock); |
| 373 | |
| 374 | |
| 375 | struct xt_table_info * |
| 376 | xt_replace_table(struct xt_table *table, |
| 377 | unsigned int num_counters, |
| 378 | struct xt_table_info *newinfo, |
| 379 | int *error) |
| 380 | { |
| 381 | struct xt_table_info *oldinfo, *private; |
| 382 | |
| 383 | /* Do the substitution. */ |
| 384 | write_lock_bh(&table->lock); |
| 385 | private = table->private; |
| 386 | /* Check inside lock: is the old number correct? */ |
| 387 | if (num_counters != private->number) { |
| 388 | duprintf("num_counters != table->private->number (%u/%u)\n", |
| 389 | num_counters, private->number); |
| 390 | write_unlock_bh(&table->lock); |
| 391 | *error = -EAGAIN; |
| 392 | return NULL; |
| 393 | } |
| 394 | oldinfo = private; |
| 395 | table->private = newinfo; |
| 396 | newinfo->initial_entries = oldinfo->initial_entries; |
| 397 | write_unlock_bh(&table->lock); |
| 398 | |
| 399 | return oldinfo; |
| 400 | } |
| 401 | EXPORT_SYMBOL_GPL(xt_replace_table); |
| 402 | |
| 403 | int xt_register_table(struct xt_table *table, |
| 404 | struct xt_table_info *bootstrap, |
| 405 | struct xt_table_info *newinfo) |
| 406 | { |
| 407 | int ret; |
| 408 | struct xt_table_info *private; |
| 409 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 410 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 411 | if (ret != 0) |
| 412 | return ret; |
| 413 | |
| 414 | /* Don't autoload: we'd eat our tail... */ |
| 415 | if (list_named_find(&xt[table->af].tables, table->name)) { |
| 416 | ret = -EEXIST; |
| 417 | goto unlock; |
| 418 | } |
| 419 | |
| 420 | /* Simplifies replace_table code. */ |
| 421 | table->private = bootstrap; |
| 422 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
| 423 | goto unlock; |
| 424 | |
| 425 | private = table->private; |
| 426 | duprintf("table->private->number = %u\n", private->number); |
| 427 | |
| 428 | /* save number of initial entries */ |
| 429 | private->initial_entries = private->number; |
| 430 | |
| 431 | rwlock_init(&table->lock); |
| 432 | list_prepend(&xt[table->af].tables, table); |
| 433 | |
| 434 | ret = 0; |
| 435 | unlock: |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 436 | mutex_unlock(&xt[table->af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 437 | return ret; |
| 438 | } |
| 439 | EXPORT_SYMBOL_GPL(xt_register_table); |
| 440 | |
| 441 | void *xt_unregister_table(struct xt_table *table) |
| 442 | { |
| 443 | struct xt_table_info *private; |
| 444 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 445 | mutex_lock(&xt[table->af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 446 | private = table->private; |
| 447 | LIST_DELETE(&xt[table->af].tables, table); |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 448 | mutex_unlock(&xt[table->af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 449 | |
| 450 | return private; |
| 451 | } |
| 452 | EXPORT_SYMBOL_GPL(xt_unregister_table); |
| 453 | |
| 454 | #ifdef CONFIG_PROC_FS |
| 455 | static char *xt_proto_prefix[NPROTO] = { |
| 456 | [AF_INET] = "ip", |
| 457 | [AF_INET6] = "ip6", |
| 458 | [NF_ARP] = "arp", |
| 459 | }; |
| 460 | |
| 461 | static struct list_head *xt_get_idx(struct list_head *list, struct seq_file *seq, loff_t pos) |
| 462 | { |
| 463 | struct list_head *head = list->next; |
| 464 | |
| 465 | if (!head || list_empty(list)) |
| 466 | return NULL; |
| 467 | |
| 468 | while (pos && (head = head->next)) { |
| 469 | if (head == list) |
| 470 | return NULL; |
| 471 | pos--; |
| 472 | } |
| 473 | return pos ? NULL : head; |
| 474 | } |
| 475 | |
| 476 | static struct list_head *type2list(u_int16_t af, u_int16_t type) |
| 477 | { |
| 478 | struct list_head *list; |
| 479 | |
| 480 | switch (type) { |
| 481 | case TARGET: |
| 482 | list = &xt[af].target; |
| 483 | break; |
| 484 | case MATCH: |
| 485 | list = &xt[af].match; |
| 486 | break; |
| 487 | case TABLE: |
| 488 | list = &xt[af].tables; |
| 489 | break; |
| 490 | default: |
| 491 | list = NULL; |
| 492 | break; |
| 493 | } |
| 494 | |
| 495 | return list; |
| 496 | } |
| 497 | |
| 498 | static void *xt_tgt_seq_start(struct seq_file *seq, loff_t *pos) |
| 499 | { |
| 500 | struct proc_dir_entry *pde = (struct proc_dir_entry *) seq->private; |
| 501 | u_int16_t af = (unsigned long)pde->data & 0xffff; |
| 502 | u_int16_t type = (unsigned long)pde->data >> 16; |
| 503 | struct list_head *list; |
| 504 | |
| 505 | if (af >= NPROTO) |
| 506 | return NULL; |
| 507 | |
| 508 | list = type2list(af, type); |
| 509 | if (!list) |
| 510 | return NULL; |
| 511 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 512 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 513 | return NULL; |
| 514 | |
| 515 | return xt_get_idx(list, seq, *pos); |
| 516 | } |
| 517 | |
| 518 | static void *xt_tgt_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 519 | { |
| 520 | struct proc_dir_entry *pde = seq->private; |
| 521 | u_int16_t af = (unsigned long)pde->data & 0xffff; |
| 522 | u_int16_t type = (unsigned long)pde->data >> 16; |
| 523 | struct list_head *list; |
| 524 | |
| 525 | if (af >= NPROTO) |
| 526 | return NULL; |
| 527 | |
| 528 | list = type2list(af, type); |
| 529 | if (!list) |
| 530 | return NULL; |
| 531 | |
| 532 | (*pos)++; |
| 533 | return xt_get_idx(list, seq, *pos); |
| 534 | } |
| 535 | |
| 536 | static void xt_tgt_seq_stop(struct seq_file *seq, void *v) |
| 537 | { |
| 538 | struct proc_dir_entry *pde = seq->private; |
| 539 | u_int16_t af = (unsigned long)pde->data & 0xffff; |
| 540 | |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 541 | mutex_unlock(&xt[af].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | static int xt_name_seq_show(struct seq_file *seq, void *v) |
| 545 | { |
| 546 | char *name = (char *)v + sizeof(struct list_head); |
| 547 | |
| 548 | if (strlen(name)) |
| 549 | return seq_printf(seq, "%s\n", name); |
| 550 | else |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | static struct seq_operations xt_tgt_seq_ops = { |
| 555 | .start = xt_tgt_seq_start, |
| 556 | .next = xt_tgt_seq_next, |
| 557 | .stop = xt_tgt_seq_stop, |
| 558 | .show = xt_name_seq_show, |
| 559 | }; |
| 560 | |
| 561 | static int xt_tgt_open(struct inode *inode, struct file *file) |
| 562 | { |
| 563 | int ret; |
| 564 | |
| 565 | ret = seq_open(file, &xt_tgt_seq_ops); |
| 566 | if (!ret) { |
| 567 | struct seq_file *seq = file->private_data; |
| 568 | struct proc_dir_entry *pde = PDE(inode); |
| 569 | |
| 570 | seq->private = pde; |
| 571 | } |
| 572 | |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | static struct file_operations xt_file_ops = { |
| 577 | .owner = THIS_MODULE, |
| 578 | .open = xt_tgt_open, |
| 579 | .read = seq_read, |
| 580 | .llseek = seq_lseek, |
| 581 | .release = seq_release, |
| 582 | }; |
| 583 | |
| 584 | #define FORMAT_TABLES "_tables_names" |
| 585 | #define FORMAT_MATCHES "_tables_matches" |
| 586 | #define FORMAT_TARGETS "_tables_targets" |
| 587 | |
| 588 | #endif /* CONFIG_PROC_FS */ |
| 589 | |
| 590 | int xt_proto_init(int af) |
| 591 | { |
| 592 | #ifdef CONFIG_PROC_FS |
| 593 | char buf[XT_FUNCTION_MAXNAMELEN]; |
| 594 | struct proc_dir_entry *proc; |
| 595 | #endif |
| 596 | |
| 597 | if (af >= NPROTO) |
| 598 | return -EINVAL; |
| 599 | |
| 600 | |
| 601 | #ifdef CONFIG_PROC_FS |
| 602 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 603 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
| 604 | proc = proc_net_fops_create(buf, 0440, &xt_file_ops); |
| 605 | if (!proc) |
| 606 | goto out; |
| 607 | proc->data = (void *) ((unsigned long) af | (TABLE << 16)); |
| 608 | |
| 609 | |
| 610 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 611 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
| 612 | proc = proc_net_fops_create(buf, 0440, &xt_file_ops); |
| 613 | if (!proc) |
| 614 | goto out_remove_tables; |
| 615 | proc->data = (void *) ((unsigned long) af | (MATCH << 16)); |
| 616 | |
| 617 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 618 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
| 619 | proc = proc_net_fops_create(buf, 0440, &xt_file_ops); |
| 620 | if (!proc) |
| 621 | goto out_remove_matches; |
| 622 | proc->data = (void *) ((unsigned long) af | (TARGET << 16)); |
| 623 | #endif |
| 624 | |
| 625 | return 0; |
| 626 | |
| 627 | #ifdef CONFIG_PROC_FS |
| 628 | out_remove_matches: |
| 629 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 630 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
| 631 | proc_net_remove(buf); |
| 632 | |
| 633 | out_remove_tables: |
| 634 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 635 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
| 636 | proc_net_remove(buf); |
| 637 | out: |
| 638 | return -1; |
| 639 | #endif |
| 640 | } |
| 641 | EXPORT_SYMBOL_GPL(xt_proto_init); |
| 642 | |
| 643 | void xt_proto_fini(int af) |
| 644 | { |
| 645 | #ifdef CONFIG_PROC_FS |
| 646 | char buf[XT_FUNCTION_MAXNAMELEN]; |
| 647 | |
| 648 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 649 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
| 650 | proc_net_remove(buf); |
| 651 | |
| 652 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 653 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
| 654 | proc_net_remove(buf); |
| 655 | |
| 656 | strlcpy(buf, xt_proto_prefix[af], sizeof(buf)); |
| 657 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
| 658 | proc_net_remove(buf); |
| 659 | #endif /*CONFIG_PROC_FS*/ |
| 660 | } |
| 661 | EXPORT_SYMBOL_GPL(xt_proto_fini); |
| 662 | |
| 663 | |
| 664 | static int __init xt_init(void) |
| 665 | { |
| 666 | int i; |
| 667 | |
| 668 | xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL); |
| 669 | if (!xt) |
| 670 | return -ENOMEM; |
| 671 | |
| 672 | for (i = 0; i < NPROTO; i++) { |
Ingo Molnar | 9e19bb6 | 2006-03-25 01:41:10 -0800 | [diff] [blame] | 673 | mutex_init(&xt[i].mutex); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 674 | INIT_LIST_HEAD(&xt[i].target); |
| 675 | INIT_LIST_HEAD(&xt[i].match); |
| 676 | INIT_LIST_HEAD(&xt[i].tables); |
| 677 | } |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | static void __exit xt_fini(void) |
| 682 | { |
| 683 | kfree(xt); |
| 684 | } |
| 685 | |
| 686 | module_init(xt_init); |
| 687 | module_exit(xt_fini); |
| 688 | |