Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/act_api.c Packet action API. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Author: Jamal Hadi Salim |
| 10 | * |
| 11 | * |
| 12 | */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
| 20 | #include <linux/kmod.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <net/sch_generic.h> |
| 22 | #include <net/act_api.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 23 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 25 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
| 26 | { |
| 27 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
| 28 | struct tcf_common **p1p; |
| 29 | |
| 30 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { |
| 31 | if (*p1p == p) { |
| 32 | write_lock_bh(hinfo->lock); |
| 33 | *p1p = p->tcfc_next; |
| 34 | write_unlock_bh(hinfo->lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 35 | gen_kill_estimator(&p->tcfc_bstats, |
| 36 | &p->tcfc_rate_est); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 37 | kfree(p); |
| 38 | return; |
| 39 | } |
| 40 | } |
| 41 | BUG_TRAP(0); |
| 42 | } |
| 43 | EXPORT_SYMBOL(tcf_hash_destroy); |
| 44 | |
| 45 | int tcf_hash_release(struct tcf_common *p, int bind, |
| 46 | struct tcf_hashinfo *hinfo) |
| 47 | { |
| 48 | int ret = 0; |
| 49 | |
| 50 | if (p) { |
| 51 | if (bind) |
| 52 | p->tcfc_bindcnt--; |
| 53 | |
| 54 | p->tcfc_refcnt--; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 55 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 56 | tcf_hash_destroy(p, hinfo); |
| 57 | ret = 1; |
| 58 | } |
| 59 | } |
| 60 | return ret; |
| 61 | } |
| 62 | EXPORT_SYMBOL(tcf_hash_release); |
| 63 | |
| 64 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, |
| 65 | struct tc_action *a, struct tcf_hashinfo *hinfo) |
| 66 | { |
| 67 | struct tcf_common *p; |
| 68 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; |
| 69 | struct rtattr *r ; |
| 70 | |
Jamal Hadi Salim | e1e992e | 2007-09-12 16:32:59 +0200 | [diff] [blame^] | 71 | read_lock_bh(hinfo->lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 72 | |
| 73 | s_i = cb->args[0]; |
| 74 | |
| 75 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
| 76 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
| 77 | |
| 78 | for (; p; p = p->tcfc_next) { |
| 79 | index++; |
| 80 | if (index < s_i) |
| 81 | continue; |
| 82 | a->priv = p; |
| 83 | a->order = n_i; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 84 | r = (struct rtattr *)skb_tail_pointer(skb); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 85 | RTA_PUT(skb, a->order, 0, NULL); |
| 86 | err = tcf_action_dump_1(skb, a, 0, 0); |
| 87 | if (err < 0) { |
| 88 | index--; |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 89 | nlmsg_trim(skb, r); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 90 | goto done; |
| 91 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 92 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 93 | n_i++; |
| 94 | if (n_i >= TCA_ACT_MAX_PRIO) |
| 95 | goto done; |
| 96 | } |
| 97 | } |
| 98 | done: |
Jamal Hadi Salim | e1e992e | 2007-09-12 16:32:59 +0200 | [diff] [blame^] | 99 | read_unlock_bh(hinfo->lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 100 | if (n_i) |
| 101 | cb->args[0] += n_i; |
| 102 | return n_i; |
| 103 | |
| 104 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 105 | nlmsg_trim(skb, r); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 106 | goto done; |
| 107 | } |
| 108 | |
| 109 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, |
| 110 | struct tcf_hashinfo *hinfo) |
| 111 | { |
| 112 | struct tcf_common *p, *s_p; |
| 113 | struct rtattr *r ; |
| 114 | int i= 0, n_i = 0; |
| 115 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 116 | r = (struct rtattr *)skb_tail_pointer(skb); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 117 | RTA_PUT(skb, a->order, 0, NULL); |
| 118 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); |
| 119 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
| 120 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
| 121 | |
| 122 | while (p != NULL) { |
| 123 | s_p = p->tcfc_next; |
| 124 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) |
| 125 | module_put(a->ops->owner); |
| 126 | n_i++; |
| 127 | p = s_p; |
| 128 | } |
| 129 | } |
| 130 | RTA_PUT(skb, TCA_FCNT, 4, &n_i); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 131 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 132 | |
| 133 | return n_i; |
| 134 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 135 | nlmsg_trim(skb, r); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 136 | return -EINVAL; |
| 137 | } |
| 138 | |
| 139 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
| 140 | int type, struct tc_action *a) |
| 141 | { |
| 142 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
| 143 | |
| 144 | if (type == RTM_DELACTION) { |
| 145 | return tcf_del_walker(skb, a, hinfo); |
| 146 | } else if (type == RTM_GETACTION) { |
| 147 | return tcf_dump_walker(skb, cb, a, hinfo); |
| 148 | } else { |
| 149 | printk("tcf_generic_walker: unknown action %d\n", type); |
| 150 | return -EINVAL; |
| 151 | } |
| 152 | } |
| 153 | EXPORT_SYMBOL(tcf_generic_walker); |
| 154 | |
| 155 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
| 156 | { |
| 157 | struct tcf_common *p; |
| 158 | |
Jamal Hadi Salim | e1e992e | 2007-09-12 16:32:59 +0200 | [diff] [blame^] | 159 | read_lock_bh(hinfo->lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 160 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
| 161 | p = p->tcfc_next) { |
| 162 | if (p->tcfc_index == index) |
| 163 | break; |
| 164 | } |
Jamal Hadi Salim | e1e992e | 2007-09-12 16:32:59 +0200 | [diff] [blame^] | 165 | read_unlock_bh(hinfo->lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 166 | |
| 167 | return p; |
| 168 | } |
| 169 | EXPORT_SYMBOL(tcf_hash_lookup); |
| 170 | |
| 171 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) |
| 172 | { |
| 173 | u32 val = *idx_gen; |
| 174 | |
| 175 | do { |
| 176 | if (++val == 0) |
| 177 | val = 1; |
| 178 | } while (tcf_hash_lookup(val, hinfo)); |
| 179 | |
| 180 | return (*idx_gen = val); |
| 181 | } |
| 182 | EXPORT_SYMBOL(tcf_hash_new_index); |
| 183 | |
| 184 | int tcf_hash_search(struct tc_action *a, u32 index) |
| 185 | { |
| 186 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
| 187 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); |
| 188 | |
| 189 | if (p) { |
| 190 | a->priv = p; |
| 191 | return 1; |
| 192 | } |
| 193 | return 0; |
| 194 | } |
| 195 | EXPORT_SYMBOL(tcf_hash_search); |
| 196 | |
| 197 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, |
| 198 | struct tcf_hashinfo *hinfo) |
| 199 | { |
| 200 | struct tcf_common *p = NULL; |
| 201 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { |
| 202 | if (bind) { |
| 203 | p->tcfc_bindcnt++; |
| 204 | p->tcfc_refcnt++; |
| 205 | } |
| 206 | a->priv = p; |
| 207 | } |
| 208 | return p; |
| 209 | } |
| 210 | EXPORT_SYMBOL(tcf_hash_check); |
| 211 | |
| 212 | struct tcf_common *tcf_hash_create(u32 index, struct rtattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo) |
| 213 | { |
| 214 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
| 215 | |
| 216 | if (unlikely(!p)) |
| 217 | return p; |
| 218 | p->tcfc_refcnt = 1; |
| 219 | if (bind) |
| 220 | p->tcfc_bindcnt = 1; |
| 221 | |
| 222 | spin_lock_init(&p->tcfc_lock); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 223 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
| 224 | p->tcfc_tm.install = jiffies; |
| 225 | p->tcfc_tm.lastuse = jiffies; |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 226 | if (est) |
| 227 | gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, |
Patrick McHardy | 4bdf399 | 2007-07-02 22:47:37 -0700 | [diff] [blame] | 228 | &p->tcfc_lock, est); |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 229 | a->priv = (void *) p; |
| 230 | return p; |
| 231 | } |
| 232 | EXPORT_SYMBOL(tcf_hash_create); |
| 233 | |
| 234 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
| 235 | { |
| 236 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
| 237 | |
| 238 | write_lock_bh(hinfo->lock); |
| 239 | p->tcfc_next = hinfo->htab[h]; |
| 240 | hinfo->htab[h] = p; |
| 241 | write_unlock_bh(hinfo->lock); |
| 242 | } |
| 243 | EXPORT_SYMBOL(tcf_hash_insert); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | static struct tc_action_ops *act_base = NULL; |
| 246 | static DEFINE_RWLOCK(act_mod_lock); |
| 247 | |
| 248 | int tcf_register_action(struct tc_action_ops *act) |
| 249 | { |
| 250 | struct tc_action_ops *a, **ap; |
| 251 | |
| 252 | write_lock(&act_mod_lock); |
| 253 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { |
| 254 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
| 255 | write_unlock(&act_mod_lock); |
| 256 | return -EEXIST; |
| 257 | } |
| 258 | } |
| 259 | act->next = NULL; |
| 260 | *ap = act; |
| 261 | write_unlock(&act_mod_lock); |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | int tcf_unregister_action(struct tc_action_ops *act) |
| 266 | { |
| 267 | struct tc_action_ops *a, **ap; |
| 268 | int err = -ENOENT; |
| 269 | |
| 270 | write_lock(&act_mod_lock); |
| 271 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) |
| 272 | if (a == act) |
| 273 | break; |
| 274 | if (a) { |
| 275 | *ap = a->next; |
| 276 | a->next = NULL; |
| 277 | err = 0; |
| 278 | } |
| 279 | write_unlock(&act_mod_lock); |
| 280 | return err; |
| 281 | } |
| 282 | |
| 283 | /* lookup by name */ |
| 284 | static struct tc_action_ops *tc_lookup_action_n(char *kind) |
| 285 | { |
| 286 | struct tc_action_ops *a = NULL; |
| 287 | |
| 288 | if (kind) { |
| 289 | read_lock(&act_mod_lock); |
| 290 | for (a = act_base; a; a = a->next) { |
| 291 | if (strcmp(kind, a->kind) == 0) { |
| 292 | if (!try_module_get(a->owner)) { |
| 293 | read_unlock(&act_mod_lock); |
| 294 | return NULL; |
| 295 | } |
| 296 | break; |
| 297 | } |
| 298 | } |
| 299 | read_unlock(&act_mod_lock); |
| 300 | } |
| 301 | return a; |
| 302 | } |
| 303 | |
| 304 | /* lookup by rtattr */ |
| 305 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) |
| 306 | { |
| 307 | struct tc_action_ops *a = NULL; |
| 308 | |
| 309 | if (kind) { |
| 310 | read_lock(&act_mod_lock); |
| 311 | for (a = act_base; a; a = a->next) { |
| 312 | if (rtattr_strcmp(kind, a->kind) == 0) { |
| 313 | if (!try_module_get(a->owner)) { |
| 314 | read_unlock(&act_mod_lock); |
| 315 | return NULL; |
| 316 | } |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | read_unlock(&act_mod_lock); |
| 321 | } |
| 322 | return a; |
| 323 | } |
| 324 | |
| 325 | #if 0 |
| 326 | /* lookup by id */ |
| 327 | static struct tc_action_ops *tc_lookup_action_id(u32 type) |
| 328 | { |
| 329 | struct tc_action_ops *a = NULL; |
| 330 | |
| 331 | if (type) { |
| 332 | read_lock(&act_mod_lock); |
| 333 | for (a = act_base; a; a = a->next) { |
| 334 | if (a->type == type) { |
| 335 | if (!try_module_get(a->owner)) { |
| 336 | read_unlock(&act_mod_lock); |
| 337 | return NULL; |
| 338 | } |
| 339 | break; |
| 340 | } |
| 341 | } |
| 342 | read_unlock(&act_mod_lock); |
| 343 | } |
| 344 | return a; |
| 345 | } |
| 346 | #endif |
| 347 | |
| 348 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 349 | struct tcf_result *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | struct tc_action *a; |
| 352 | int ret = -1; |
| 353 | |
| 354 | if (skb->tc_verd & TC_NCLS) { |
| 355 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | ret = TC_ACT_OK; |
| 357 | goto exec_done; |
| 358 | } |
| 359 | while ((a = act) != NULL) { |
| 360 | repeat: |
| 361 | if (a->ops && a->ops->act) { |
Patrick McHardy | f43c5a0 | 2006-01-08 22:15:34 -0800 | [diff] [blame] | 362 | ret = a->ops->act(skb, a, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | if (TC_MUNGED & skb->tc_verd) { |
| 364 | /* copied already, allow trampling */ |
| 365 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); |
| 366 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); |
| 367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | if (ret == TC_ACT_REPEAT) |
| 369 | goto repeat; /* we need a ttl - JHS */ |
J Hadi Salim | 14d50e7 | 2005-05-03 16:29:13 -0700 | [diff] [blame] | 370 | if (ret != TC_ACT_PIPE) |
| 371 | goto exec_done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | act = a->next; |
| 374 | } |
| 375 | exec_done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | return ret; |
| 377 | } |
| 378 | |
| 379 | void tcf_action_destroy(struct tc_action *act, int bind) |
| 380 | { |
| 381 | struct tc_action *a; |
| 382 | |
| 383 | for (a = act; a; a = act) { |
| 384 | if (a->ops && a->ops->cleanup) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
| 386 | module_put(a->ops->owner); |
| 387 | act = act->next; |
| 388 | kfree(a); |
| 389 | } else { /*FIXME: Remove later - catch insertion bugs*/ |
| 390 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); |
| 391 | act = act->next; |
| 392 | kfree(a); |
| 393 | } |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | int |
| 398 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
| 399 | { |
| 400 | int err = -EINVAL; |
| 401 | |
| 402 | if (a->ops == NULL || a->ops->dump == NULL) |
| 403 | return err; |
| 404 | return a->ops->dump(skb, a, bind, ref); |
| 405 | } |
| 406 | |
| 407 | int |
| 408 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
| 409 | { |
| 410 | int err = -EINVAL; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 411 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | struct rtattr *r; |
| 413 | |
| 414 | if (a->ops == NULL || a->ops->dump == NULL) |
| 415 | return err; |
| 416 | |
| 417 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); |
| 418 | if (tcf_action_copy_stats(skb, a, 0)) |
| 419 | goto rtattr_failure; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 420 | r = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
| 422 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 423 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | return err; |
| 425 | } |
| 426 | |
| 427 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 428 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | return -1; |
| 430 | } |
| 431 | |
| 432 | int |
| 433 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) |
| 434 | { |
| 435 | struct tc_action *a; |
| 436 | int err = -EINVAL; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 437 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | struct rtattr *r ; |
| 439 | |
| 440 | while ((a = act) != NULL) { |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 441 | r = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | act = a->next; |
| 443 | RTA_PUT(skb, a->order, 0, NULL); |
| 444 | err = tcf_action_dump_1(skb, a, bind, ref); |
| 445 | if (err < 0) |
Thomas Graf | 4fe683f | 2006-07-05 20:47:28 -0700 | [diff] [blame] | 446 | goto errout; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 447 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | return 0; |
| 451 | |
| 452 | rtattr_failure: |
Thomas Graf | 4fe683f | 2006-07-05 20:47:28 -0700 | [diff] [blame] | 453 | err = -EINVAL; |
| 454 | errout: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 455 | nlmsg_trim(skb, b); |
Thomas Graf | 4fe683f | 2006-07-05 20:47:28 -0700 | [diff] [blame] | 456 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 460 | char *name, int ovr, int bind, int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
| 462 | struct tc_action *a; |
| 463 | struct tc_action_ops *a_o; |
| 464 | char act_name[IFNAMSIZ]; |
| 465 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 466 | struct rtattr *kind; |
| 467 | |
| 468 | *err = -EINVAL; |
| 469 | |
| 470 | if (name == NULL) { |
| 471 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 472 | goto err_out; |
| 473 | kind = tb[TCA_ACT_KIND-1]; |
| 474 | if (kind == NULL) |
| 475 | goto err_out; |
| 476 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
| 477 | goto err_out; |
| 478 | } else { |
| 479 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
| 480 | goto err_out; |
| 481 | } |
| 482 | |
| 483 | a_o = tc_lookup_action_n(act_name); |
| 484 | if (a_o == NULL) { |
| 485 | #ifdef CONFIG_KMOD |
| 486 | rtnl_unlock(); |
Patrick McHardy | 4bba392 | 2006-01-08 22:22:14 -0800 | [diff] [blame] | 487 | request_module("act_%s", act_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | rtnl_lock(); |
| 489 | |
| 490 | a_o = tc_lookup_action_n(act_name); |
| 491 | |
| 492 | /* We dropped the RTNL semaphore in order to |
| 493 | * perform the module load. So, even if we |
| 494 | * succeeded in loading the module we have to |
| 495 | * tell the caller to replay the request. We |
| 496 | * indicate this using -EAGAIN. |
| 497 | */ |
| 498 | if (a_o != NULL) { |
| 499 | *err = -EAGAIN; |
| 500 | goto err_mod; |
| 501 | } |
| 502 | #endif |
Thomas Graf | d152b4e | 2006-07-05 20:45:57 -0700 | [diff] [blame] | 503 | *err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | goto err_out; |
| 505 | } |
| 506 | |
| 507 | *err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 508 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (a == NULL) |
| 510 | goto err_mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | /* backward compatibility for policer */ |
| 513 | if (name == NULL) |
| 514 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); |
| 515 | else |
| 516 | *err = a_o->init(rta, est, a, ovr, bind); |
| 517 | if (*err < 0) |
| 518 | goto err_free; |
| 519 | |
| 520 | /* module count goes up only when brand new policy is created |
| 521 | if it exists and is only bound to in a_o->init() then |
| 522 | ACT_P_CREATED is not returned (a zero is). |
| 523 | */ |
| 524 | if (*err != ACT_P_CREATED) |
| 525 | module_put(a_o->owner); |
| 526 | a->ops = a_o; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
| 528 | *err = 0; |
| 529 | return a; |
| 530 | |
| 531 | err_free: |
| 532 | kfree(a); |
| 533 | err_mod: |
| 534 | module_put(a_o->owner); |
| 535 | err_out: |
| 536 | return NULL; |
| 537 | } |
| 538 | |
| 539 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 540 | char *name, int ovr, int bind, int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
| 542 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; |
| 543 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
| 544 | int i; |
| 545 | |
| 546 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { |
| 547 | *err = -EINVAL; |
| 548 | return head; |
| 549 | } |
| 550 | |
| 551 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { |
| 552 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); |
| 553 | if (act == NULL) |
| 554 | goto err; |
| 555 | act->order = i+1; |
| 556 | |
| 557 | if (head == NULL) |
| 558 | head = act; |
| 559 | else |
| 560 | act_prev->next = act; |
| 561 | act_prev = act; |
| 562 | } |
| 563 | return head; |
| 564 | |
| 565 | err: |
| 566 | if (head != NULL) |
| 567 | tcf_action_destroy(head, bind); |
| 568 | return NULL; |
| 569 | } |
| 570 | |
| 571 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, |
| 572 | int compat_mode) |
| 573 | { |
| 574 | int err = 0; |
| 575 | struct gnet_dump d; |
| 576 | struct tcf_act_hdr *h = a->priv; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | if (h == NULL) |
| 579 | goto errout; |
| 580 | |
| 581 | /* compat_mode being true specifies a call that is supposed |
| 582 | * to add additional backward compatiblity statistic TLVs. |
| 583 | */ |
| 584 | if (compat_mode) { |
| 585 | if (a->type == TCA_OLD_COMPAT) |
| 586 | err = gnet_stats_start_copy_compat(skb, 0, |
Patrick McHardy | 4bdf399 | 2007-07-02 22:47:37 -0700 | [diff] [blame] | 587 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | else |
| 589 | return 0; |
| 590 | } else |
| 591 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, |
Patrick McHardy | 4bdf399 | 2007-07-02 22:47:37 -0700 | [diff] [blame] | 592 | &h->tcf_lock, &d); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | if (err < 0) |
| 595 | goto errout; |
| 596 | |
| 597 | if (a->ops != NULL && a->ops->get_stats != NULL) |
| 598 | if (a->ops->get_stats(skb, a) < 0) |
| 599 | goto errout; |
| 600 | |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 601 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 602 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
David S. Miller | e9ce1cd | 2006-08-21 23:54:55 -0700 | [diff] [blame] | 603 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | goto errout; |
| 605 | |
| 606 | if (gnet_stats_finish_copy(&d) < 0) |
| 607 | goto errout; |
| 608 | |
| 609 | return 0; |
| 610 | |
| 611 | errout: |
| 612 | return -1; |
| 613 | } |
| 614 | |
| 615 | static int |
| 616 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 617 | u16 flags, int event, int bind, int ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | { |
| 619 | struct tcamsg *t; |
| 620 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 621 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | struct rtattr *x; |
| 623 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 624 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | t = NLMSG_DATA(nlh); |
| 627 | t->tca_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 628 | t->tca__pad1 = 0; |
| 629 | t->tca__pad2 = 0; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 630 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 631 | x = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 633 | |
| 634 | if (tcf_action_dump(skb, a, bind, ref) < 0) |
| 635 | goto rtattr_failure; |
| 636 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 637 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 638 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 639 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return skb->len; |
| 641 | |
| 642 | rtattr_failure: |
| 643 | nlmsg_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 644 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | return -1; |
| 646 | } |
| 647 | |
| 648 | static int |
| 649 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) |
| 650 | { |
| 651 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 654 | if (!skb) |
| 655 | return -ENOBUFS; |
| 656 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
| 657 | kfree_skb(skb); |
| 658 | return -EINVAL; |
| 659 | } |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 660 | |
| 661 | return rtnl_unicast(skb, pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | static struct tc_action * |
| 665 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) |
| 666 | { |
| 667 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 668 | struct tc_action *a; |
| 669 | int index; |
| 670 | |
| 671 | *err = -EINVAL; |
| 672 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 673 | return NULL; |
| 674 | |
| 675 | if (tb[TCA_ACT_INDEX - 1] == NULL || |
| 676 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) |
| 677 | return NULL; |
| 678 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); |
| 679 | |
| 680 | *err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 681 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | if (a == NULL) |
| 683 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | *err = -EINVAL; |
| 686 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); |
| 687 | if (a->ops == NULL) |
| 688 | goto err_free; |
| 689 | if (a->ops->lookup == NULL) |
| 690 | goto err_mod; |
| 691 | *err = -ENOENT; |
| 692 | if (a->ops->lookup(a, index) == 0) |
| 693 | goto err_mod; |
| 694 | |
| 695 | module_put(a->ops->owner); |
| 696 | *err = 0; |
| 697 | return a; |
| 698 | err_mod: |
| 699 | module_put(a->ops->owner); |
| 700 | err_free: |
| 701 | kfree(a); |
| 702 | return NULL; |
| 703 | } |
| 704 | |
| 705 | static void cleanup_a(struct tc_action *act) |
| 706 | { |
| 707 | struct tc_action *a; |
| 708 | |
| 709 | for (a = act; a; a = act) { |
| 710 | act = a->next; |
| 711 | kfree(a); |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | static struct tc_action *create_a(int i) |
| 716 | { |
| 717 | struct tc_action *act; |
| 718 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 719 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | if (act == NULL) { |
| 721 | printk("create_a: failed to alloc!\n"); |
| 722 | return NULL; |
| 723 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | act->order = i; |
| 725 | return act; |
| 726 | } |
| 727 | |
| 728 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) |
| 729 | { |
| 730 | struct sk_buff *skb; |
| 731 | unsigned char *b; |
| 732 | struct nlmsghdr *nlh; |
| 733 | struct tcamsg *t; |
| 734 | struct netlink_callback dcb; |
| 735 | struct rtattr *x; |
| 736 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 737 | struct rtattr *kind; |
| 738 | struct tc_action *a = create_a(0); |
| 739 | int err = -EINVAL; |
| 740 | |
| 741 | if (a == NULL) { |
| 742 | printk("tca_action_flush: couldnt create tc_action\n"); |
| 743 | return err; |
| 744 | } |
| 745 | |
| 746 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 747 | if (!skb) { |
| 748 | printk("tca_action_flush: failed skb alloc\n"); |
| 749 | kfree(a); |
| 750 | return -ENOBUFS; |
| 751 | } |
| 752 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 753 | b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 756 | goto err_out; |
| 757 | |
| 758 | kind = tb[TCA_ACT_KIND-1]; |
| 759 | a->ops = tc_lookup_action(kind); |
| 760 | if (a->ops == NULL) |
| 761 | goto err_out; |
| 762 | |
| 763 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); |
| 764 | t = NLMSG_DATA(nlh); |
| 765 | t->tca_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 766 | t->tca__pad1 = 0; |
| 767 | t->tca__pad2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 769 | x = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 771 | |
| 772 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); |
| 773 | if (err < 0) |
| 774 | goto rtattr_failure; |
| 775 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 776 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 778 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | nlh->nlmsg_flags |= NLM_F_ROOT; |
| 780 | module_put(a->ops->owner); |
| 781 | kfree(a); |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 782 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | if (err > 0) |
| 784 | return 0; |
| 785 | |
| 786 | return err; |
| 787 | |
| 788 | rtattr_failure: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | nlmsg_failure: |
Thomas Graf | ebbaeab | 2006-07-09 11:36:23 -0700 | [diff] [blame] | 790 | module_put(a->ops->owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | err_out: |
| 792 | kfree_skb(skb); |
| 793 | kfree(a); |
| 794 | return err; |
| 795 | } |
| 796 | |
| 797 | static int |
| 798 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) |
| 799 | { |
| 800 | int i, ret = 0; |
| 801 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; |
| 802 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
| 803 | |
| 804 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) |
| 805 | return -EINVAL; |
| 806 | |
| 807 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { |
| 808 | if (tb[0] != NULL && tb[1] == NULL) |
| 809 | return tca_action_flush(tb[0], n, pid); |
| 810 | } |
| 811 | |
| 812 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { |
| 813 | act = tcf_action_get_1(tb[i], n, pid, &ret); |
| 814 | if (act == NULL) |
| 815 | goto err; |
| 816 | act->order = i+1; |
| 817 | |
| 818 | if (head == NULL) |
| 819 | head = act; |
| 820 | else |
| 821 | act_prev->next = act; |
| 822 | act_prev = act; |
| 823 | } |
| 824 | |
| 825 | if (event == RTM_GETACTION) |
| 826 | ret = act_get_notify(pid, n, head, event); |
| 827 | else { /* delete */ |
| 828 | struct sk_buff *skb; |
| 829 | |
| 830 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 831 | if (!skb) { |
| 832 | ret = -ENOBUFS; |
| 833 | goto err; |
| 834 | } |
| 835 | |
| 836 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 837 | 0, 1) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | kfree_skb(skb); |
| 839 | ret = -EINVAL; |
| 840 | goto err; |
| 841 | } |
| 842 | |
| 843 | /* now do the delete */ |
| 844 | tcf_action_destroy(head, 0); |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 845 | ret = rtnetlink_send(skb, pid, RTNLGRP_TC, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 846 | n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | if (ret > 0) |
| 848 | return 0; |
| 849 | return ret; |
| 850 | } |
| 851 | err: |
| 852 | cleanup_a(head); |
| 853 | return ret; |
| 854 | } |
| 855 | |
| 856 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 857 | u16 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
| 859 | struct tcamsg *t; |
| 860 | struct nlmsghdr *nlh; |
| 861 | struct sk_buff *skb; |
| 862 | struct rtattr *x; |
| 863 | unsigned char *b; |
| 864 | int err = 0; |
| 865 | |
| 866 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 867 | if (!skb) |
| 868 | return -ENOBUFS; |
| 869 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 870 | b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 872 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | t = NLMSG_DATA(nlh); |
| 874 | t->tca_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 875 | t->tca__pad1 = 0; |
| 876 | t->tca__pad2 = 0; |
| 877 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 878 | x = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 880 | |
| 881 | if (tcf_action_dump(skb, a, 0, 0) < 0) |
| 882 | goto rtattr_failure; |
| 883 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 884 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 885 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 886 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 887 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 888 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 889 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | if (err > 0) |
| 891 | err = 0; |
| 892 | return err; |
| 893 | |
| 894 | rtattr_failure: |
| 895 | nlmsg_failure: |
Patrick McHardy | f6e5746 | 2006-03-12 20:33:22 -0800 | [diff] [blame] | 896 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | return -1; |
| 898 | } |
| 899 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | static int |
| 902 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) |
| 903 | { |
| 904 | int ret = 0; |
| 905 | struct tc_action *act; |
| 906 | struct tc_action *a; |
| 907 | u32 seq = n->nlmsg_seq; |
| 908 | |
| 909 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); |
| 910 | if (act == NULL) |
| 911 | goto done; |
| 912 | |
| 913 | /* dump then free all the actions after update; inserted policy |
| 914 | * stays intact |
| 915 | * */ |
| 916 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
| 917 | for (a = act; a; a = act) { |
| 918 | act = a->next; |
| 919 | kfree(a); |
| 920 | } |
| 921 | done: |
| 922 | return ret; |
| 923 | } |
| 924 | |
| 925 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 926 | { |
| 927 | struct rtattr **tca = arg; |
| 928 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
| 929 | int ret = 0, ovr = 0; |
| 930 | |
| 931 | if (tca[TCA_ACT_TAB-1] == NULL) { |
| 932 | printk("tc_ctl_action: received NO action attribs\n"); |
| 933 | return -EINVAL; |
| 934 | } |
| 935 | |
| 936 | /* n->nlmsg_flags&NLM_F_CREATE |
| 937 | * */ |
| 938 | switch (n->nlmsg_type) { |
| 939 | case RTM_NEWACTION: |
| 940 | /* we are going to assume all other flags |
| 941 | * imply create only if it doesnt exist |
| 942 | * Note that CREATE | EXCL implies that |
| 943 | * but since we want avoid ambiguity (eg when flags |
| 944 | * is zero) then just set this |
| 945 | */ |
| 946 | if (n->nlmsg_flags&NLM_F_REPLACE) |
| 947 | ovr = 1; |
| 948 | replay: |
| 949 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); |
| 950 | if (ret == -EAGAIN) |
| 951 | goto replay; |
| 952 | break; |
| 953 | case RTM_DELACTION: |
| 954 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); |
| 955 | break; |
| 956 | case RTM_GETACTION: |
| 957 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); |
| 958 | break; |
| 959 | default: |
| 960 | BUG(); |
| 961 | } |
| 962 | |
| 963 | return ret; |
| 964 | } |
| 965 | |
Thomas Graf | 26dab89 | 2006-07-05 20:45:06 -0700 | [diff] [blame] | 966 | static struct rtattr * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | find_dump_kind(struct nlmsghdr *n) |
| 968 | { |
| 969 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; |
| 970 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; |
| 971 | struct rtattr *rta[TCAA_MAX + 1]; |
| 972 | struct rtattr *kind; |
| 973 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); |
| 974 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); |
| 975 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); |
| 976 | |
| 977 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) |
| 978 | return NULL; |
| 979 | tb1 = rta[TCA_ACT_TAB - 1]; |
| 980 | if (tb1 == NULL) |
| 981 | return NULL; |
| 982 | |
| 983 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 984 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | return NULL; |
| 986 | if (tb[0] == NULL) |
| 987 | return NULL; |
| 988 | |
| 989 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 990 | RTA_PAYLOAD(tb[0])) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | return NULL; |
| 992 | kind = tb2[TCA_ACT_KIND-1]; |
| 993 | |
Thomas Graf | 26dab89 | 2006-07-05 20:45:06 -0700 | [diff] [blame] | 994 | return kind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | static int |
| 998 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
| 999 | { |
| 1000 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1001 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | struct rtattr *x; |
| 1003 | struct tc_action_ops *a_o; |
| 1004 | struct tc_action a; |
| 1005 | int ret = 0; |
| 1006 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); |
Thomas Graf | 26dab89 | 2006-07-05 20:45:06 -0700 | [diff] [blame] | 1007 | struct rtattr *kind = find_dump_kind(cb->nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
| 1009 | if (kind == NULL) { |
| 1010 | printk("tc_dump_action: action bad kind\n"); |
| 1011 | return 0; |
| 1012 | } |
| 1013 | |
Thomas Graf | 26dab89 | 2006-07-05 20:45:06 -0700 | [diff] [blame] | 1014 | a_o = tc_lookup_action(kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | if (a_o == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | return 0; |
| 1017 | } |
| 1018 | |
| 1019 | memset(&a, 0, sizeof(struct tc_action)); |
| 1020 | a.ops = a_o; |
| 1021 | |
| 1022 | if (a_o->walk == NULL) { |
Thomas Graf | 26dab89 | 2006-07-05 20:45:06 -0700 | [diff] [blame] | 1023 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | goto rtattr_failure; |
| 1025 | } |
| 1026 | |
| 1027 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1028 | cb->nlh->nlmsg_type, sizeof(*t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | t = NLMSG_DATA(nlh); |
| 1030 | t->tca_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1031 | t->tca__pad1 = 0; |
| 1032 | t->tca__pad2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1034 | x = (struct rtattr *)skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 1036 | |
| 1037 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); |
| 1038 | if (ret < 0) |
| 1039 | goto rtattr_failure; |
| 1040 | |
| 1041 | if (ret > 0) { |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1042 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | ret = skb->len; |
| 1044 | } else |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1045 | nlmsg_trim(skb, x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1047 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | if (NETLINK_CB(cb->skb).pid && ret) |
| 1049 | nlh->nlmsg_flags |= NLM_F_MULTI; |
| 1050 | module_put(a_o->owner); |
| 1051 | return skb->len; |
| 1052 | |
| 1053 | rtattr_failure: |
| 1054 | nlmsg_failure: |
| 1055 | module_put(a_o->owner); |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1056 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | return skb->len; |
| 1058 | } |
| 1059 | |
| 1060 | static int __init tc_action_init(void) |
| 1061 | { |
Thomas Graf | 708914c | 2007-03-22 11:56:59 -0700 | [diff] [blame] | 1062 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
| 1063 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); |
| 1064 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | subsys_initcall(tc_action_init); |
| 1070 | |
| 1071 | EXPORT_SYMBOL(tcf_register_action); |
| 1072 | EXPORT_SYMBOL(tcf_unregister_action); |
| 1073 | EXPORT_SYMBOL(tcf_action_exec); |
| 1074 | EXPORT_SYMBOL(tcf_action_dump_1); |