Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2008-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 as |
| 5 | * published by the Free Software Foundation. |
| 6 | */ |
| 7 | |
| 8 | /* Kernel module implementing an IP set type: the list:set type */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/ip.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | #include <linux/errno.h> |
| 14 | |
| 15 | #include <linux/netfilter/ipset/ip_set.h> |
| 16 | #include <linux/netfilter/ipset/ip_set_timeout.h> |
| 17 | #include <linux/netfilter/ipset/ip_set_list.h> |
| 18 | |
| 19 | MODULE_LICENSE("GPL"); |
| 20 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| 21 | MODULE_DESCRIPTION("list:set type of IP sets"); |
| 22 | MODULE_ALIAS("ip_set_list:set"); |
| 23 | |
| 24 | /* Member elements without and with timeout */ |
| 25 | struct set_elem { |
| 26 | ip_set_id_t id; |
| 27 | }; |
| 28 | |
| 29 | struct set_telem { |
| 30 | ip_set_id_t id; |
| 31 | unsigned long timeout; |
| 32 | }; |
| 33 | |
| 34 | /* Type structure */ |
| 35 | struct list_set { |
| 36 | size_t dsize; /* element size */ |
| 37 | u32 size; /* size of set list array */ |
| 38 | u32 timeout; /* timeout value */ |
| 39 | struct timer_list gc; /* garbage collection */ |
| 40 | struct set_elem members[0]; /* the set members */ |
| 41 | }; |
| 42 | |
| 43 | static inline struct set_elem * |
| 44 | list_set_elem(const struct list_set *map, u32 id) |
| 45 | { |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 46 | return (struct set_elem *)((void *)map->members + id * map->dsize); |
| 47 | } |
| 48 | |
| 49 | static inline struct set_telem * |
| 50 | list_set_telem(const struct list_set *map, u32 id) |
| 51 | { |
| 52 | return (struct set_telem *)((void *)map->members + id * map->dsize); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | static inline bool |
| 56 | list_set_timeout(const struct list_set *map, u32 id) |
| 57 | { |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 58 | const struct set_telem *elem = list_set_telem(map, id); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 59 | |
| 60 | return ip_set_timeout_test(elem->timeout); |
| 61 | } |
| 62 | |
| 63 | static inline bool |
| 64 | list_set_expired(const struct list_set *map, u32 id) |
| 65 | { |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 66 | const struct set_telem *elem = list_set_telem(map, id); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 67 | |
| 68 | return ip_set_timeout_expired(elem->timeout); |
| 69 | } |
| 70 | |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 71 | /* Set list without and with timeout */ |
| 72 | |
| 73 | static int |
| 74 | list_set_kadt(struct ip_set *set, const struct sk_buff *skb, |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame^] | 75 | enum ipset_adt adt, const struct ip_set_adt_opt *opt) |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 76 | { |
| 77 | struct list_set *map = set->data; |
| 78 | struct set_elem *elem; |
| 79 | u32 i; |
| 80 | int ret; |
| 81 | |
| 82 | for (i = 0; i < map->size; i++) { |
| 83 | elem = list_set_elem(map, i); |
| 84 | if (elem->id == IPSET_INVALID_ID) |
| 85 | return 0; |
| 86 | if (with_timeout(map->timeout) && list_set_expired(map, i)) |
| 87 | continue; |
| 88 | switch (adt) { |
| 89 | case IPSET_TEST: |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame^] | 90 | ret = ip_set_test(elem->id, skb, opt); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 91 | if (ret > 0) |
| 92 | return ret; |
| 93 | break; |
| 94 | case IPSET_ADD: |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame^] | 95 | ret = ip_set_add(elem->id, skb, opt); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 96 | if (ret == 0) |
| 97 | return ret; |
| 98 | break; |
| 99 | case IPSET_DEL: |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame^] | 100 | ret = ip_set_del(elem->id, skb, opt); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 101 | if (ret == 0) |
| 102 | return ret; |
| 103 | break; |
| 104 | default: |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | return -EINVAL; |
| 109 | } |
| 110 | |
| 111 | static bool |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 112 | id_eq(const struct list_set *map, u32 i, ip_set_id_t id) |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 113 | { |
| 114 | const struct set_elem *elem; |
| 115 | |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 116 | if (i < map->size) { |
| 117 | elem = list_set_elem(map, i); |
| 118 | return elem->id == id; |
| 119 | } |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static bool |
| 125 | id_eq_timeout(const struct list_set *map, u32 i, ip_set_id_t id) |
| 126 | { |
| 127 | const struct set_elem *elem; |
| 128 | |
| 129 | if (i < map->size) { |
| 130 | elem = list_set_elem(map, i); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 131 | return !!(elem->id == id && |
| 132 | !(with_timeout(map->timeout) && |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 133 | list_set_expired(map, i))); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static void |
| 140 | list_elem_add(struct list_set *map, u32 i, ip_set_id_t id) |
| 141 | { |
| 142 | struct set_elem *e; |
| 143 | |
| 144 | for (; i < map->size; i++) { |
| 145 | e = list_set_elem(map, i); |
| 146 | swap(e->id, id); |
| 147 | if (e->id == IPSET_INVALID_ID) |
| 148 | break; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static void |
| 153 | list_elem_tadd(struct list_set *map, u32 i, ip_set_id_t id, |
| 154 | unsigned long timeout) |
| 155 | { |
| 156 | struct set_telem *e; |
| 157 | |
| 158 | for (; i < map->size; i++) { |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 159 | e = list_set_telem(map, i); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 160 | swap(e->id, id); |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 161 | swap(e->timeout, timeout); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 162 | if (e->id == IPSET_INVALID_ID) |
| 163 | break; |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 164 | } |
| 165 | } |
| 166 | |
| 167 | static int |
| 168 | list_set_add(struct list_set *map, u32 i, ip_set_id_t id, |
| 169 | unsigned long timeout) |
| 170 | { |
| 171 | const struct set_elem *e = list_set_elem(map, i); |
| 172 | |
| 173 | if (i == map->size - 1 && e->id != IPSET_INVALID_ID) |
| 174 | /* Last element replaced: e.g. add new,before,last */ |
| 175 | ip_set_put_byindex(e->id); |
| 176 | if (with_timeout(map->timeout)) |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 177 | list_elem_tadd(map, i, id, ip_set_timeout_set(timeout)); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 178 | else |
| 179 | list_elem_add(map, i, id); |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | static int |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 185 | list_set_del(struct list_set *map, u32 i) |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 186 | { |
| 187 | struct set_elem *a = list_set_elem(map, i), *b; |
| 188 | |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 189 | ip_set_put_byindex(a->id); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 190 | |
| 191 | for (; i < map->size - 1; i++) { |
| 192 | b = list_set_elem(map, i + 1); |
| 193 | a->id = b->id; |
| 194 | if (with_timeout(map->timeout)) |
| 195 | ((struct set_telem *)a)->timeout = |
| 196 | ((struct set_telem *)b)->timeout; |
| 197 | a = b; |
| 198 | if (a->id == IPSET_INVALID_ID) |
| 199 | break; |
| 200 | } |
| 201 | /* Last element */ |
| 202 | a->id = IPSET_INVALID_ID; |
| 203 | return 0; |
| 204 | } |
| 205 | |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 206 | static void |
| 207 | cleanup_entries(struct list_set *map) |
| 208 | { |
| 209 | struct set_telem *e; |
| 210 | u32 i; |
| 211 | |
| 212 | for (i = 0; i < map->size; i++) { |
| 213 | e = list_set_telem(map, i); |
| 214 | if (e->id != IPSET_INVALID_ID && list_set_expired(map, i)) |
| 215 | list_set_del(map, i); |
| 216 | } |
| 217 | } |
| 218 | |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 219 | static int |
| 220 | list_set_uadt(struct ip_set *set, struct nlattr *tb[], |
| 221 | enum ipset_adt adt, u32 *lineno, u32 flags) |
| 222 | { |
| 223 | struct list_set *map = set->data; |
| 224 | bool with_timeout = with_timeout(map->timeout); |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 225 | bool flag_exist = flags & IPSET_FLAG_EXIST; |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 226 | int before = 0; |
| 227 | u32 timeout = map->timeout; |
| 228 | ip_set_id_t id, refid = IPSET_INVALID_ID; |
| 229 | const struct set_elem *elem; |
| 230 | struct ip_set *s; |
| 231 | u32 i; |
| 232 | int ret = 0; |
| 233 | |
| 234 | if (unlikely(!tb[IPSET_ATTR_NAME] || |
| 235 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
| 236 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) |
| 237 | return -IPSET_ERR_PROTOCOL; |
| 238 | |
| 239 | if (tb[IPSET_ATTR_LINENO]) |
| 240 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); |
| 241 | |
| 242 | id = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAME]), &s); |
| 243 | if (id == IPSET_INVALID_ID) |
| 244 | return -IPSET_ERR_NAME; |
| 245 | /* "Loop detection" */ |
| 246 | if (s->type->features & IPSET_TYPE_NAME) { |
| 247 | ret = -IPSET_ERR_LOOP; |
| 248 | goto finish; |
| 249 | } |
| 250 | |
| 251 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
| 252 | u32 f = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
| 253 | before = f & IPSET_FLAG_BEFORE; |
| 254 | } |
| 255 | |
| 256 | if (before && !tb[IPSET_ATTR_NAMEREF]) { |
| 257 | ret = -IPSET_ERR_BEFORE; |
| 258 | goto finish; |
| 259 | } |
| 260 | |
| 261 | if (tb[IPSET_ATTR_NAMEREF]) { |
| 262 | refid = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAMEREF]), |
| 263 | &s); |
| 264 | if (refid == IPSET_INVALID_ID) { |
| 265 | ret = -IPSET_ERR_NAMEREF; |
| 266 | goto finish; |
| 267 | } |
| 268 | if (!before) |
| 269 | before = -1; |
| 270 | } |
| 271 | if (tb[IPSET_ATTR_TIMEOUT]) { |
| 272 | if (!with_timeout) { |
| 273 | ret = -IPSET_ERR_TIMEOUT; |
| 274 | goto finish; |
| 275 | } |
| 276 | timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| 277 | } |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 278 | if (with_timeout && adt != IPSET_TEST) |
| 279 | cleanup_entries(map); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 280 | |
| 281 | switch (adt) { |
| 282 | case IPSET_TEST: |
| 283 | for (i = 0; i < map->size && !ret; i++) { |
| 284 | elem = list_set_elem(map, i); |
| 285 | if (elem->id == IPSET_INVALID_ID || |
| 286 | (before != 0 && i + 1 >= map->size)) |
| 287 | break; |
| 288 | else if (with_timeout && list_set_expired(map, i)) |
| 289 | continue; |
| 290 | else if (before > 0 && elem->id == id) |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 291 | ret = id_eq_timeout(map, i + 1, refid); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 292 | else if (before < 0 && elem->id == refid) |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 293 | ret = id_eq_timeout(map, i + 1, id); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 294 | else if (before == 0 && elem->id == id) |
| 295 | ret = 1; |
| 296 | } |
| 297 | break; |
| 298 | case IPSET_ADD: |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 299 | for (i = 0; i < map->size; i++) { |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 300 | elem = list_set_elem(map, i); |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 301 | if (elem->id != id) |
| 302 | continue; |
| 303 | if (!(with_timeout && flag_exist)) { |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 304 | ret = -IPSET_ERR_EXIST; |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 305 | goto finish; |
| 306 | } else { |
| 307 | struct set_telem *e = list_set_telem(map, i); |
| 308 | |
| 309 | if ((before > 1 && |
| 310 | !id_eq(map, i + 1, refid)) || |
| 311 | (before < 0 && |
| 312 | (i == 0 || !id_eq(map, i - 1, refid)))) { |
Jozsef Kadlecsik | 483e9ea | 2011-06-16 18:41:53 +0200 | [diff] [blame] | 313 | ret = -IPSET_ERR_EXIST; |
| 314 | goto finish; |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 315 | } |
| 316 | e->timeout = ip_set_timeout_set(timeout); |
| 317 | ip_set_put_byindex(id); |
| 318 | ret = 0; |
| 319 | goto finish; |
| 320 | } |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 321 | } |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 322 | ret = -IPSET_ERR_LIST_FULL; |
| 323 | for (i = 0; i < map->size && ret == -IPSET_ERR_LIST_FULL; i++) { |
| 324 | elem = list_set_elem(map, i); |
| 325 | if (elem->id == IPSET_INVALID_ID) |
| 326 | ret = before != 0 ? -IPSET_ERR_REF_EXIST |
| 327 | : list_set_add(map, i, id, timeout); |
| 328 | else if (elem->id != refid) |
| 329 | continue; |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 330 | else if (before > 0) |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 331 | ret = list_set_add(map, i, id, timeout); |
| 332 | else if (i + 1 < map->size) |
| 333 | ret = list_set_add(map, i + 1, id, timeout); |
| 334 | } |
| 335 | break; |
| 336 | case IPSET_DEL: |
| 337 | ret = -IPSET_ERR_EXIST; |
| 338 | for (i = 0; i < map->size && ret == -IPSET_ERR_EXIST; i++) { |
| 339 | elem = list_set_elem(map, i); |
| 340 | if (elem->id == IPSET_INVALID_ID) { |
| 341 | ret = before != 0 ? -IPSET_ERR_REF_EXIST |
| 342 | : -IPSET_ERR_EXIST; |
| 343 | break; |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 344 | } else if (elem->id == id && |
| 345 | (before == 0 || |
| 346 | (before > 0 && id_eq(map, i + 1, refid)))) |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 347 | ret = list_set_del(map, i); |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 348 | else if (elem->id == refid && |
| 349 | before < 0 && id_eq(map, i + 1, id)) |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 350 | ret = list_set_del(map, i + 1); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 351 | } |
| 352 | break; |
| 353 | default: |
| 354 | break; |
| 355 | } |
| 356 | |
| 357 | finish: |
| 358 | if (refid != IPSET_INVALID_ID) |
| 359 | ip_set_put_byindex(refid); |
| 360 | if (adt != IPSET_ADD || ret) |
| 361 | ip_set_put_byindex(id); |
| 362 | |
| 363 | return ip_set_eexist(ret, flags) ? 0 : ret; |
| 364 | } |
| 365 | |
| 366 | static void |
| 367 | list_set_flush(struct ip_set *set) |
| 368 | { |
| 369 | struct list_set *map = set->data; |
| 370 | struct set_elem *elem; |
| 371 | u32 i; |
| 372 | |
| 373 | for (i = 0; i < map->size; i++) { |
| 374 | elem = list_set_elem(map, i); |
| 375 | if (elem->id != IPSET_INVALID_ID) { |
| 376 | ip_set_put_byindex(elem->id); |
| 377 | elem->id = IPSET_INVALID_ID; |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static void |
| 383 | list_set_destroy(struct ip_set *set) |
| 384 | { |
| 385 | struct list_set *map = set->data; |
| 386 | |
| 387 | if (with_timeout(map->timeout)) |
| 388 | del_timer_sync(&map->gc); |
| 389 | list_set_flush(set); |
| 390 | kfree(map); |
| 391 | |
| 392 | set->data = NULL; |
| 393 | } |
| 394 | |
| 395 | static int |
| 396 | list_set_head(struct ip_set *set, struct sk_buff *skb) |
| 397 | { |
| 398 | const struct list_set *map = set->data; |
| 399 | struct nlattr *nested; |
| 400 | |
| 401 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); |
| 402 | if (!nested) |
| 403 | goto nla_put_failure; |
| 404 | NLA_PUT_NET32(skb, IPSET_ATTR_SIZE, htonl(map->size)); |
| 405 | if (with_timeout(map->timeout)) |
| 406 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout)); |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 407 | NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 408 | NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, |
| 409 | htonl(sizeof(*map) + map->size * map->dsize)); |
| 410 | ipset_nest_end(skb, nested); |
| 411 | |
| 412 | return 0; |
| 413 | nla_put_failure: |
| 414 | return -EMSGSIZE; |
| 415 | } |
| 416 | |
| 417 | static int |
| 418 | list_set_list(const struct ip_set *set, |
| 419 | struct sk_buff *skb, struct netlink_callback *cb) |
| 420 | { |
| 421 | const struct list_set *map = set->data; |
| 422 | struct nlattr *atd, *nested; |
| 423 | u32 i, first = cb->args[2]; |
| 424 | const struct set_elem *e; |
| 425 | |
| 426 | atd = ipset_nest_start(skb, IPSET_ATTR_ADT); |
| 427 | if (!atd) |
| 428 | return -EMSGSIZE; |
| 429 | for (; cb->args[2] < map->size; cb->args[2]++) { |
| 430 | i = cb->args[2]; |
| 431 | e = list_set_elem(map, i); |
| 432 | if (e->id == IPSET_INVALID_ID) |
| 433 | goto finish; |
| 434 | if (with_timeout(map->timeout) && list_set_expired(map, i)) |
| 435 | continue; |
| 436 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); |
| 437 | if (!nested) { |
| 438 | if (i == first) { |
| 439 | nla_nest_cancel(skb, atd); |
| 440 | return -EMSGSIZE; |
| 441 | } else |
| 442 | goto nla_put_failure; |
| 443 | } |
| 444 | NLA_PUT_STRING(skb, IPSET_ATTR_NAME, |
| 445 | ip_set_name_byindex(e->id)); |
| 446 | if (with_timeout(map->timeout)) { |
| 447 | const struct set_telem *te = |
| 448 | (const struct set_telem *) e; |
| 449 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, |
| 450 | htonl(ip_set_timeout_get(te->timeout))); |
| 451 | } |
| 452 | ipset_nest_end(skb, nested); |
| 453 | } |
| 454 | finish: |
| 455 | ipset_nest_end(skb, atd); |
| 456 | /* Set listing finished */ |
| 457 | cb->args[2] = 0; |
| 458 | return 0; |
| 459 | |
| 460 | nla_put_failure: |
| 461 | nla_nest_cancel(skb, nested); |
| 462 | ipset_nest_end(skb, atd); |
| 463 | if (unlikely(i == first)) { |
| 464 | cb->args[2] = 0; |
| 465 | return -EMSGSIZE; |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | static bool |
| 471 | list_set_same_set(const struct ip_set *a, const struct ip_set *b) |
| 472 | { |
| 473 | const struct list_set *x = a->data; |
| 474 | const struct list_set *y = b->data; |
| 475 | |
| 476 | return x->size == y->size && |
| 477 | x->timeout == y->timeout; |
| 478 | } |
| 479 | |
| 480 | static const struct ip_set_type_variant list_set = { |
| 481 | .kadt = list_set_kadt, |
| 482 | .uadt = list_set_uadt, |
| 483 | .destroy = list_set_destroy, |
| 484 | .flush = list_set_flush, |
| 485 | .head = list_set_head, |
| 486 | .list = list_set_list, |
| 487 | .same_set = list_set_same_set, |
| 488 | }; |
| 489 | |
| 490 | static void |
| 491 | list_set_gc(unsigned long ul_set) |
| 492 | { |
| 493 | struct ip_set *set = (struct ip_set *) ul_set; |
| 494 | struct list_set *map = set->data; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 495 | |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 496 | write_lock_bh(&set->lock); |
Jozsef Kadlecsik | 5416219 | 2011-06-16 18:40:55 +0200 | [diff] [blame] | 497 | cleanup_entries(map); |
Jozsef Kadlecsik | 512d06b | 2011-04-04 15:18:45 +0200 | [diff] [blame] | 498 | write_unlock_bh(&set->lock); |
Jozsef Kadlecsik | f830837 | 2011-02-01 15:54:59 +0100 | [diff] [blame] | 499 | |
| 500 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; |
| 501 | add_timer(&map->gc); |
| 502 | } |
| 503 | |
| 504 | static void |
| 505 | list_set_gc_init(struct ip_set *set) |
| 506 | { |
| 507 | struct list_set *map = set->data; |
| 508 | |
| 509 | init_timer(&map->gc); |
| 510 | map->gc.data = (unsigned long) set; |
| 511 | map->gc.function = list_set_gc; |
| 512 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; |
| 513 | add_timer(&map->gc); |
| 514 | } |
| 515 | |
| 516 | /* Create list:set type of sets */ |
| 517 | |
| 518 | static bool |
| 519 | init_list_set(struct ip_set *set, u32 size, size_t dsize, |
| 520 | unsigned long timeout) |
| 521 | { |
| 522 | struct list_set *map; |
| 523 | struct set_elem *e; |
| 524 | u32 i; |
| 525 | |
| 526 | map = kzalloc(sizeof(*map) + size * dsize, GFP_KERNEL); |
| 527 | if (!map) |
| 528 | return false; |
| 529 | |
| 530 | map->size = size; |
| 531 | map->dsize = dsize; |
| 532 | map->timeout = timeout; |
| 533 | set->data = map; |
| 534 | |
| 535 | for (i = 0; i < size; i++) { |
| 536 | e = list_set_elem(map, i); |
| 537 | e->id = IPSET_INVALID_ID; |
| 538 | } |
| 539 | |
| 540 | return true; |
| 541 | } |
| 542 | |
| 543 | static int |
| 544 | list_set_create(struct ip_set *set, struct nlattr *tb[], u32 flags) |
| 545 | { |
| 546 | u32 size = IP_SET_LIST_DEFAULT_SIZE; |
| 547 | |
| 548 | if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_SIZE) || |
| 549 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) |
| 550 | return -IPSET_ERR_PROTOCOL; |
| 551 | |
| 552 | if (tb[IPSET_ATTR_SIZE]) |
| 553 | size = ip_set_get_h32(tb[IPSET_ATTR_SIZE]); |
| 554 | if (size < IP_SET_LIST_MIN_SIZE) |
| 555 | size = IP_SET_LIST_MIN_SIZE; |
| 556 | |
| 557 | if (tb[IPSET_ATTR_TIMEOUT]) { |
| 558 | if (!init_list_set(set, size, sizeof(struct set_telem), |
| 559 | ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]))) |
| 560 | return -ENOMEM; |
| 561 | |
| 562 | list_set_gc_init(set); |
| 563 | } else { |
| 564 | if (!init_list_set(set, size, sizeof(struct set_elem), |
| 565 | IPSET_NO_TIMEOUT)) |
| 566 | return -ENOMEM; |
| 567 | } |
| 568 | set->variant = &list_set; |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | static struct ip_set_type list_set_type __read_mostly = { |
| 573 | .name = "list:set", |
| 574 | .protocol = IPSET_PROTOCOL, |
| 575 | .features = IPSET_TYPE_NAME | IPSET_DUMP_LAST, |
| 576 | .dimension = IPSET_DIM_ONE, |
| 577 | .family = AF_UNSPEC, |
| 578 | .revision = 0, |
| 579 | .create = list_set_create, |
| 580 | .create_policy = { |
| 581 | [IPSET_ATTR_SIZE] = { .type = NLA_U32 }, |
| 582 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
| 583 | }, |
| 584 | .adt_policy = { |
| 585 | [IPSET_ATTR_NAME] = { .type = NLA_STRING, |
| 586 | .len = IPSET_MAXNAMELEN }, |
| 587 | [IPSET_ATTR_NAMEREF] = { .type = NLA_STRING, |
| 588 | .len = IPSET_MAXNAMELEN }, |
| 589 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
| 590 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
| 591 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
| 592 | }, |
| 593 | .me = THIS_MODULE, |
| 594 | }; |
| 595 | |
| 596 | static int __init |
| 597 | list_set_init(void) |
| 598 | { |
| 599 | return ip_set_type_register(&list_set_type); |
| 600 | } |
| 601 | |
| 602 | static void __exit |
| 603 | list_set_fini(void) |
| 604 | { |
| 605 | ip_set_type_unregister(&list_set_type); |
| 606 | } |
| 607 | |
| 608 | module_init(list_set_init); |
| 609 | module_exit(list_set_fini); |