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 | |
| 14 | #include <asm/uaccess.h> |
| 15 | #include <asm/system.h> |
| 16 | #include <linux/bitops.h> |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/socket.h> |
| 24 | #include <linux/sockios.h> |
| 25 | #include <linux/in.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/netdevice.h> |
| 29 | #include <linux/skbuff.h> |
| 30 | #include <linux/rtnetlink.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/kmod.h> |
| 33 | #include <net/sock.h> |
| 34 | #include <net/sch_generic.h> |
| 35 | #include <net/act_api.h> |
| 36 | |
| 37 | #if 1 /* control */ |
| 38 | #define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args) |
| 39 | #else |
| 40 | #define DPRINTK(format, args...) |
| 41 | #endif |
| 42 | #if 0 /* data */ |
| 43 | #define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args) |
| 44 | #else |
| 45 | #define D2PRINTK(format, args...) |
| 46 | #endif |
| 47 | |
| 48 | static struct tc_action_ops *act_base = NULL; |
| 49 | static DEFINE_RWLOCK(act_mod_lock); |
| 50 | |
| 51 | int tcf_register_action(struct tc_action_ops *act) |
| 52 | { |
| 53 | struct tc_action_ops *a, **ap; |
| 54 | |
| 55 | write_lock(&act_mod_lock); |
| 56 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { |
| 57 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
| 58 | write_unlock(&act_mod_lock); |
| 59 | return -EEXIST; |
| 60 | } |
| 61 | } |
| 62 | act->next = NULL; |
| 63 | *ap = act; |
| 64 | write_unlock(&act_mod_lock); |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | int tcf_unregister_action(struct tc_action_ops *act) |
| 69 | { |
| 70 | struct tc_action_ops *a, **ap; |
| 71 | int err = -ENOENT; |
| 72 | |
| 73 | write_lock(&act_mod_lock); |
| 74 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) |
| 75 | if (a == act) |
| 76 | break; |
| 77 | if (a) { |
| 78 | *ap = a->next; |
| 79 | a->next = NULL; |
| 80 | err = 0; |
| 81 | } |
| 82 | write_unlock(&act_mod_lock); |
| 83 | return err; |
| 84 | } |
| 85 | |
| 86 | /* lookup by name */ |
| 87 | static struct tc_action_ops *tc_lookup_action_n(char *kind) |
| 88 | { |
| 89 | struct tc_action_ops *a = NULL; |
| 90 | |
| 91 | if (kind) { |
| 92 | read_lock(&act_mod_lock); |
| 93 | for (a = act_base; a; a = a->next) { |
| 94 | if (strcmp(kind, a->kind) == 0) { |
| 95 | if (!try_module_get(a->owner)) { |
| 96 | read_unlock(&act_mod_lock); |
| 97 | return NULL; |
| 98 | } |
| 99 | break; |
| 100 | } |
| 101 | } |
| 102 | read_unlock(&act_mod_lock); |
| 103 | } |
| 104 | return a; |
| 105 | } |
| 106 | |
| 107 | /* lookup by rtattr */ |
| 108 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) |
| 109 | { |
| 110 | struct tc_action_ops *a = NULL; |
| 111 | |
| 112 | if (kind) { |
| 113 | read_lock(&act_mod_lock); |
| 114 | for (a = act_base; a; a = a->next) { |
| 115 | if (rtattr_strcmp(kind, a->kind) == 0) { |
| 116 | if (!try_module_get(a->owner)) { |
| 117 | read_unlock(&act_mod_lock); |
| 118 | return NULL; |
| 119 | } |
| 120 | break; |
| 121 | } |
| 122 | } |
| 123 | read_unlock(&act_mod_lock); |
| 124 | } |
| 125 | return a; |
| 126 | } |
| 127 | |
| 128 | #if 0 |
| 129 | /* lookup by id */ |
| 130 | static struct tc_action_ops *tc_lookup_action_id(u32 type) |
| 131 | { |
| 132 | struct tc_action_ops *a = NULL; |
| 133 | |
| 134 | if (type) { |
| 135 | read_lock(&act_mod_lock); |
| 136 | for (a = act_base; a; a = a->next) { |
| 137 | if (a->type == type) { |
| 138 | if (!try_module_get(a->owner)) { |
| 139 | read_unlock(&act_mod_lock); |
| 140 | return NULL; |
| 141 | } |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | read_unlock(&act_mod_lock); |
| 146 | } |
| 147 | return a; |
| 148 | } |
| 149 | #endif |
| 150 | |
| 151 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, |
| 152 | struct tcf_result *res) |
| 153 | { |
| 154 | struct tc_action *a; |
| 155 | int ret = -1; |
| 156 | |
| 157 | if (skb->tc_verd & TC_NCLS) { |
| 158 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 159 | D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n", |
| 160 | skb, skb->input_dev ? skb->input_dev->name : "xxx", |
| 161 | skb->dev->name); |
| 162 | ret = TC_ACT_OK; |
| 163 | goto exec_done; |
| 164 | } |
| 165 | while ((a = act) != NULL) { |
| 166 | repeat: |
| 167 | if (a->ops && a->ops->act) { |
| 168 | ret = a->ops->act(&skb, a); |
| 169 | if (TC_MUNGED & skb->tc_verd) { |
| 170 | /* copied already, allow trampling */ |
| 171 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); |
| 172 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); |
| 173 | } |
| 174 | if (ret != TC_ACT_PIPE) |
| 175 | goto exec_done; |
| 176 | if (ret == TC_ACT_REPEAT) |
| 177 | goto repeat; /* we need a ttl - JHS */ |
| 178 | } |
| 179 | act = a->next; |
| 180 | } |
| 181 | exec_done: |
| 182 | if (skb->tc_classid > 0) { |
| 183 | res->classid = skb->tc_classid; |
| 184 | res->class = 0; |
| 185 | skb->tc_classid = 0; |
| 186 | } |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | void tcf_action_destroy(struct tc_action *act, int bind) |
| 191 | { |
| 192 | struct tc_action *a; |
| 193 | |
| 194 | for (a = act; a; a = act) { |
| 195 | if (a->ops && a->ops->cleanup) { |
| 196 | DPRINTK("tcf_action_destroy destroying %p next %p\n", |
| 197 | a, a->next); |
| 198 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
| 199 | module_put(a->ops->owner); |
| 200 | act = act->next; |
| 201 | kfree(a); |
| 202 | } else { /*FIXME: Remove later - catch insertion bugs*/ |
| 203 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); |
| 204 | act = act->next; |
| 205 | kfree(a); |
| 206 | } |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | int |
| 211 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
| 212 | { |
| 213 | int err = -EINVAL; |
| 214 | |
| 215 | if (a->ops == NULL || a->ops->dump == NULL) |
| 216 | return err; |
| 217 | return a->ops->dump(skb, a, bind, ref); |
| 218 | } |
| 219 | |
| 220 | int |
| 221 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
| 222 | { |
| 223 | int err = -EINVAL; |
| 224 | unsigned char *b = skb->tail; |
| 225 | struct rtattr *r; |
| 226 | |
| 227 | if (a->ops == NULL || a->ops->dump == NULL) |
| 228 | return err; |
| 229 | |
| 230 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); |
| 231 | if (tcf_action_copy_stats(skb, a, 0)) |
| 232 | goto rtattr_failure; |
| 233 | r = (struct rtattr*) skb->tail; |
| 234 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
| 235 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
| 236 | r->rta_len = skb->tail - (u8*)r; |
| 237 | return err; |
| 238 | } |
| 239 | |
| 240 | rtattr_failure: |
| 241 | skb_trim(skb, b - skb->data); |
| 242 | return -1; |
| 243 | } |
| 244 | |
| 245 | int |
| 246 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) |
| 247 | { |
| 248 | struct tc_action *a; |
| 249 | int err = -EINVAL; |
| 250 | unsigned char *b = skb->tail; |
| 251 | struct rtattr *r ; |
| 252 | |
| 253 | while ((a = act) != NULL) { |
| 254 | r = (struct rtattr*) skb->tail; |
| 255 | act = a->next; |
| 256 | RTA_PUT(skb, a->order, 0, NULL); |
| 257 | err = tcf_action_dump_1(skb, a, bind, ref); |
| 258 | if (err < 0) |
| 259 | goto rtattr_failure; |
| 260 | r->rta_len = skb->tail - (u8*)r; |
| 261 | } |
| 262 | |
| 263 | return 0; |
| 264 | |
| 265 | rtattr_failure: |
| 266 | skb_trim(skb, b - skb->data); |
| 267 | return -err; |
| 268 | } |
| 269 | |
| 270 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, |
| 271 | char *name, int ovr, int bind, int *err) |
| 272 | { |
| 273 | struct tc_action *a; |
| 274 | struct tc_action_ops *a_o; |
| 275 | char act_name[IFNAMSIZ]; |
| 276 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 277 | struct rtattr *kind; |
| 278 | |
| 279 | *err = -EINVAL; |
| 280 | |
| 281 | if (name == NULL) { |
| 282 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 283 | goto err_out; |
| 284 | kind = tb[TCA_ACT_KIND-1]; |
| 285 | if (kind == NULL) |
| 286 | goto err_out; |
| 287 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
| 288 | goto err_out; |
| 289 | } else { |
| 290 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
| 291 | goto err_out; |
| 292 | } |
| 293 | |
| 294 | a_o = tc_lookup_action_n(act_name); |
| 295 | if (a_o == NULL) { |
| 296 | #ifdef CONFIG_KMOD |
| 297 | rtnl_unlock(); |
| 298 | request_module(act_name); |
| 299 | rtnl_lock(); |
| 300 | |
| 301 | a_o = tc_lookup_action_n(act_name); |
| 302 | |
| 303 | /* We dropped the RTNL semaphore in order to |
| 304 | * perform the module load. So, even if we |
| 305 | * succeeded in loading the module we have to |
| 306 | * tell the caller to replay the request. We |
| 307 | * indicate this using -EAGAIN. |
| 308 | */ |
| 309 | if (a_o != NULL) { |
| 310 | *err = -EAGAIN; |
| 311 | goto err_mod; |
| 312 | } |
| 313 | #endif |
| 314 | goto err_out; |
| 315 | } |
| 316 | |
| 317 | *err = -ENOMEM; |
| 318 | a = kmalloc(sizeof(*a), GFP_KERNEL); |
| 319 | if (a == NULL) |
| 320 | goto err_mod; |
| 321 | memset(a, 0, sizeof(*a)); |
| 322 | |
| 323 | /* backward compatibility for policer */ |
| 324 | if (name == NULL) |
| 325 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); |
| 326 | else |
| 327 | *err = a_o->init(rta, est, a, ovr, bind); |
| 328 | if (*err < 0) |
| 329 | goto err_free; |
| 330 | |
| 331 | /* module count goes up only when brand new policy is created |
| 332 | if it exists and is only bound to in a_o->init() then |
| 333 | ACT_P_CREATED is not returned (a zero is). |
| 334 | */ |
| 335 | if (*err != ACT_P_CREATED) |
| 336 | module_put(a_o->owner); |
| 337 | a->ops = a_o; |
| 338 | DPRINTK("tcf_action_init_1: successfull %s\n", act_name); |
| 339 | |
| 340 | *err = 0; |
| 341 | return a; |
| 342 | |
| 343 | err_free: |
| 344 | kfree(a); |
| 345 | err_mod: |
| 346 | module_put(a_o->owner); |
| 347 | err_out: |
| 348 | return NULL; |
| 349 | } |
| 350 | |
| 351 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, |
| 352 | char *name, int ovr, int bind, int *err) |
| 353 | { |
| 354 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; |
| 355 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
| 356 | int i; |
| 357 | |
| 358 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { |
| 359 | *err = -EINVAL; |
| 360 | return head; |
| 361 | } |
| 362 | |
| 363 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { |
| 364 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); |
| 365 | if (act == NULL) |
| 366 | goto err; |
| 367 | act->order = i+1; |
| 368 | |
| 369 | if (head == NULL) |
| 370 | head = act; |
| 371 | else |
| 372 | act_prev->next = act; |
| 373 | act_prev = act; |
| 374 | } |
| 375 | return head; |
| 376 | |
| 377 | err: |
| 378 | if (head != NULL) |
| 379 | tcf_action_destroy(head, bind); |
| 380 | return NULL; |
| 381 | } |
| 382 | |
| 383 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, |
| 384 | int compat_mode) |
| 385 | { |
| 386 | int err = 0; |
| 387 | struct gnet_dump d; |
| 388 | struct tcf_act_hdr *h = a->priv; |
| 389 | |
| 390 | if (h == NULL) |
| 391 | goto errout; |
| 392 | |
| 393 | /* compat_mode being true specifies a call that is supposed |
| 394 | * to add additional backward compatiblity statistic TLVs. |
| 395 | */ |
| 396 | if (compat_mode) { |
| 397 | if (a->type == TCA_OLD_COMPAT) |
| 398 | err = gnet_stats_start_copy_compat(skb, 0, |
| 399 | TCA_STATS, TCA_XSTATS, h->stats_lock, &d); |
| 400 | else |
| 401 | return 0; |
| 402 | } else |
| 403 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, |
| 404 | h->stats_lock, &d); |
| 405 | |
| 406 | if (err < 0) |
| 407 | goto errout; |
| 408 | |
| 409 | if (a->ops != NULL && a->ops->get_stats != NULL) |
| 410 | if (a->ops->get_stats(skb, a) < 0) |
| 411 | goto errout; |
| 412 | |
| 413 | if (gnet_stats_copy_basic(&d, &h->bstats) < 0 || |
| 414 | #ifdef CONFIG_NET_ESTIMATOR |
| 415 | gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 || |
| 416 | #endif |
| 417 | gnet_stats_copy_queue(&d, &h->qstats) < 0) |
| 418 | goto errout; |
| 419 | |
| 420 | if (gnet_stats_finish_copy(&d) < 0) |
| 421 | goto errout; |
| 422 | |
| 423 | return 0; |
| 424 | |
| 425 | errout: |
| 426 | return -1; |
| 427 | } |
| 428 | |
| 429 | static int |
| 430 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, |
| 431 | unsigned flags, int event, int bind, int ref) |
| 432 | { |
| 433 | struct tcamsg *t; |
| 434 | struct nlmsghdr *nlh; |
| 435 | unsigned char *b = skb->tail; |
| 436 | struct rtattr *x; |
| 437 | |
| 438 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); |
| 439 | nlh->nlmsg_flags = flags; |
| 440 | t = NLMSG_DATA(nlh); |
| 441 | t->tca_family = AF_UNSPEC; |
| 442 | |
| 443 | x = (struct rtattr*) skb->tail; |
| 444 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 445 | |
| 446 | if (tcf_action_dump(skb, a, bind, ref) < 0) |
| 447 | goto rtattr_failure; |
| 448 | |
| 449 | x->rta_len = skb->tail - (u8*)x; |
| 450 | |
| 451 | nlh->nlmsg_len = skb->tail - b; |
| 452 | return skb->len; |
| 453 | |
| 454 | rtattr_failure: |
| 455 | nlmsg_failure: |
| 456 | skb_trim(skb, b - skb->data); |
| 457 | return -1; |
| 458 | } |
| 459 | |
| 460 | static int |
| 461 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) |
| 462 | { |
| 463 | struct sk_buff *skb; |
| 464 | int err = 0; |
| 465 | |
| 466 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 467 | if (!skb) |
| 468 | return -ENOBUFS; |
| 469 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
| 470 | kfree_skb(skb); |
| 471 | return -EINVAL; |
| 472 | } |
| 473 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); |
| 474 | if (err > 0) |
| 475 | err = 0; |
| 476 | return err; |
| 477 | } |
| 478 | |
| 479 | static struct tc_action * |
| 480 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) |
| 481 | { |
| 482 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 483 | struct tc_action *a; |
| 484 | int index; |
| 485 | |
| 486 | *err = -EINVAL; |
| 487 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 488 | return NULL; |
| 489 | |
| 490 | if (tb[TCA_ACT_INDEX - 1] == NULL || |
| 491 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) |
| 492 | return NULL; |
| 493 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); |
| 494 | |
| 495 | *err = -ENOMEM; |
| 496 | a = kmalloc(sizeof(struct tc_action), GFP_KERNEL); |
| 497 | if (a == NULL) |
| 498 | return NULL; |
| 499 | memset(a, 0, sizeof(struct tc_action)); |
| 500 | |
| 501 | *err = -EINVAL; |
| 502 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); |
| 503 | if (a->ops == NULL) |
| 504 | goto err_free; |
| 505 | if (a->ops->lookup == NULL) |
| 506 | goto err_mod; |
| 507 | *err = -ENOENT; |
| 508 | if (a->ops->lookup(a, index) == 0) |
| 509 | goto err_mod; |
| 510 | |
| 511 | module_put(a->ops->owner); |
| 512 | *err = 0; |
| 513 | return a; |
| 514 | err_mod: |
| 515 | module_put(a->ops->owner); |
| 516 | err_free: |
| 517 | kfree(a); |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | static void cleanup_a(struct tc_action *act) |
| 522 | { |
| 523 | struct tc_action *a; |
| 524 | |
| 525 | for (a = act; a; a = act) { |
| 526 | act = a->next; |
| 527 | kfree(a); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | static struct tc_action *create_a(int i) |
| 532 | { |
| 533 | struct tc_action *act; |
| 534 | |
| 535 | act = kmalloc(sizeof(*act), GFP_KERNEL); |
| 536 | if (act == NULL) { |
| 537 | printk("create_a: failed to alloc!\n"); |
| 538 | return NULL; |
| 539 | } |
| 540 | memset(act, 0, sizeof(*act)); |
| 541 | act->order = i; |
| 542 | return act; |
| 543 | } |
| 544 | |
| 545 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) |
| 546 | { |
| 547 | struct sk_buff *skb; |
| 548 | unsigned char *b; |
| 549 | struct nlmsghdr *nlh; |
| 550 | struct tcamsg *t; |
| 551 | struct netlink_callback dcb; |
| 552 | struct rtattr *x; |
| 553 | struct rtattr *tb[TCA_ACT_MAX+1]; |
| 554 | struct rtattr *kind; |
| 555 | struct tc_action *a = create_a(0); |
| 556 | int err = -EINVAL; |
| 557 | |
| 558 | if (a == NULL) { |
| 559 | printk("tca_action_flush: couldnt create tc_action\n"); |
| 560 | return err; |
| 561 | } |
| 562 | |
| 563 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 564 | if (!skb) { |
| 565 | printk("tca_action_flush: failed skb alloc\n"); |
| 566 | kfree(a); |
| 567 | return -ENOBUFS; |
| 568 | } |
| 569 | |
| 570 | b = (unsigned char *)skb->tail; |
| 571 | |
| 572 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) |
| 573 | goto err_out; |
| 574 | |
| 575 | kind = tb[TCA_ACT_KIND-1]; |
| 576 | a->ops = tc_lookup_action(kind); |
| 577 | if (a->ops == NULL) |
| 578 | goto err_out; |
| 579 | |
| 580 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); |
| 581 | t = NLMSG_DATA(nlh); |
| 582 | t->tca_family = AF_UNSPEC; |
| 583 | |
| 584 | x = (struct rtattr *) skb->tail; |
| 585 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 586 | |
| 587 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); |
| 588 | if (err < 0) |
| 589 | goto rtattr_failure; |
| 590 | |
| 591 | x->rta_len = skb->tail - (u8 *) x; |
| 592 | |
| 593 | nlh->nlmsg_len = skb->tail - b; |
| 594 | nlh->nlmsg_flags |= NLM_F_ROOT; |
| 595 | module_put(a->ops->owner); |
| 596 | kfree(a); |
| 597 | err = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
| 598 | if (err > 0) |
| 599 | return 0; |
| 600 | |
| 601 | return err; |
| 602 | |
| 603 | rtattr_failure: |
| 604 | module_put(a->ops->owner); |
| 605 | nlmsg_failure: |
| 606 | err_out: |
| 607 | kfree_skb(skb); |
| 608 | kfree(a); |
| 609 | return err; |
| 610 | } |
| 611 | |
| 612 | static int |
| 613 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) |
| 614 | { |
| 615 | int i, ret = 0; |
| 616 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; |
| 617 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
| 618 | |
| 619 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) |
| 620 | return -EINVAL; |
| 621 | |
| 622 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { |
| 623 | if (tb[0] != NULL && tb[1] == NULL) |
| 624 | return tca_action_flush(tb[0], n, pid); |
| 625 | } |
| 626 | |
| 627 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { |
| 628 | act = tcf_action_get_1(tb[i], n, pid, &ret); |
| 629 | if (act == NULL) |
| 630 | goto err; |
| 631 | act->order = i+1; |
| 632 | |
| 633 | if (head == NULL) |
| 634 | head = act; |
| 635 | else |
| 636 | act_prev->next = act; |
| 637 | act_prev = act; |
| 638 | } |
| 639 | |
| 640 | if (event == RTM_GETACTION) |
| 641 | ret = act_get_notify(pid, n, head, event); |
| 642 | else { /* delete */ |
| 643 | struct sk_buff *skb; |
| 644 | |
| 645 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 646 | if (!skb) { |
| 647 | ret = -ENOBUFS; |
| 648 | goto err; |
| 649 | } |
| 650 | |
| 651 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, |
| 652 | 0, 1) <= 0) { |
| 653 | kfree_skb(skb); |
| 654 | ret = -EINVAL; |
| 655 | goto err; |
| 656 | } |
| 657 | |
| 658 | /* now do the delete */ |
| 659 | tcf_action_destroy(head, 0); |
| 660 | ret = rtnetlink_send(skb, pid, RTMGRP_TC, |
| 661 | n->nlmsg_flags&NLM_F_ECHO); |
| 662 | if (ret > 0) |
| 663 | return 0; |
| 664 | return ret; |
| 665 | } |
| 666 | err: |
| 667 | cleanup_a(head); |
| 668 | return ret; |
| 669 | } |
| 670 | |
| 671 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, |
| 672 | unsigned flags) |
| 673 | { |
| 674 | struct tcamsg *t; |
| 675 | struct nlmsghdr *nlh; |
| 676 | struct sk_buff *skb; |
| 677 | struct rtattr *x; |
| 678 | unsigned char *b; |
| 679 | int err = 0; |
| 680 | |
| 681 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 682 | if (!skb) |
| 683 | return -ENOBUFS; |
| 684 | |
| 685 | b = (unsigned char *)skb->tail; |
| 686 | |
| 687 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); |
| 688 | nlh->nlmsg_flags = flags; |
| 689 | t = NLMSG_DATA(nlh); |
| 690 | t->tca_family = AF_UNSPEC; |
| 691 | |
| 692 | x = (struct rtattr*) skb->tail; |
| 693 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 694 | |
| 695 | if (tcf_action_dump(skb, a, 0, 0) < 0) |
| 696 | goto rtattr_failure; |
| 697 | |
| 698 | x->rta_len = skb->tail - (u8*)x; |
| 699 | |
| 700 | nlh->nlmsg_len = skb->tail - b; |
| 701 | NETLINK_CB(skb).dst_groups = RTMGRP_TC; |
| 702 | |
| 703 | err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO); |
| 704 | if (err > 0) |
| 705 | err = 0; |
| 706 | return err; |
| 707 | |
| 708 | rtattr_failure: |
| 709 | nlmsg_failure: |
| 710 | skb_trim(skb, b - skb->data); |
| 711 | return -1; |
| 712 | } |
| 713 | |
| 714 | |
| 715 | static int |
| 716 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) |
| 717 | { |
| 718 | int ret = 0; |
| 719 | struct tc_action *act; |
| 720 | struct tc_action *a; |
| 721 | u32 seq = n->nlmsg_seq; |
| 722 | |
| 723 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); |
| 724 | if (act == NULL) |
| 725 | goto done; |
| 726 | |
| 727 | /* dump then free all the actions after update; inserted policy |
| 728 | * stays intact |
| 729 | * */ |
| 730 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
| 731 | for (a = act; a; a = act) { |
| 732 | act = a->next; |
| 733 | kfree(a); |
| 734 | } |
| 735 | done: |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 740 | { |
| 741 | struct rtattr **tca = arg; |
| 742 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
| 743 | int ret = 0, ovr = 0; |
| 744 | |
| 745 | if (tca[TCA_ACT_TAB-1] == NULL) { |
| 746 | printk("tc_ctl_action: received NO action attribs\n"); |
| 747 | return -EINVAL; |
| 748 | } |
| 749 | |
| 750 | /* n->nlmsg_flags&NLM_F_CREATE |
| 751 | * */ |
| 752 | switch (n->nlmsg_type) { |
| 753 | case RTM_NEWACTION: |
| 754 | /* we are going to assume all other flags |
| 755 | * imply create only if it doesnt exist |
| 756 | * Note that CREATE | EXCL implies that |
| 757 | * but since we want avoid ambiguity (eg when flags |
| 758 | * is zero) then just set this |
| 759 | */ |
| 760 | if (n->nlmsg_flags&NLM_F_REPLACE) |
| 761 | ovr = 1; |
| 762 | replay: |
| 763 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); |
| 764 | if (ret == -EAGAIN) |
| 765 | goto replay; |
| 766 | break; |
| 767 | case RTM_DELACTION: |
| 768 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); |
| 769 | break; |
| 770 | case RTM_GETACTION: |
| 771 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); |
| 772 | break; |
| 773 | default: |
| 774 | BUG(); |
| 775 | } |
| 776 | |
| 777 | return ret; |
| 778 | } |
| 779 | |
| 780 | static char * |
| 781 | find_dump_kind(struct nlmsghdr *n) |
| 782 | { |
| 783 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; |
| 784 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; |
| 785 | struct rtattr *rta[TCAA_MAX + 1]; |
| 786 | struct rtattr *kind; |
| 787 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); |
| 788 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); |
| 789 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); |
| 790 | |
| 791 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) |
| 792 | return NULL; |
| 793 | tb1 = rta[TCA_ACT_TAB - 1]; |
| 794 | if (tb1 == NULL) |
| 795 | return NULL; |
| 796 | |
| 797 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), |
| 798 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) |
| 799 | return NULL; |
| 800 | if (tb[0] == NULL) |
| 801 | return NULL; |
| 802 | |
| 803 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), |
| 804 | RTA_PAYLOAD(tb[0])) < 0) |
| 805 | return NULL; |
| 806 | kind = tb2[TCA_ACT_KIND-1]; |
| 807 | |
| 808 | return (char *) RTA_DATA(kind); |
| 809 | } |
| 810 | |
| 811 | static int |
| 812 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
| 813 | { |
| 814 | struct nlmsghdr *nlh; |
| 815 | unsigned char *b = skb->tail; |
| 816 | struct rtattr *x; |
| 817 | struct tc_action_ops *a_o; |
| 818 | struct tc_action a; |
| 819 | int ret = 0; |
| 820 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); |
| 821 | char *kind = find_dump_kind(cb->nlh); |
| 822 | |
| 823 | if (kind == NULL) { |
| 824 | printk("tc_dump_action: action bad kind\n"); |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | a_o = tc_lookup_action_n(kind); |
| 829 | if (a_o == NULL) { |
| 830 | printk("failed to find %s\n", kind); |
| 831 | return 0; |
| 832 | } |
| 833 | |
| 834 | memset(&a, 0, sizeof(struct tc_action)); |
| 835 | a.ops = a_o; |
| 836 | |
| 837 | if (a_o->walk == NULL) { |
| 838 | printk("tc_dump_action: %s !capable of dumping table\n", kind); |
| 839 | goto rtattr_failure; |
| 840 | } |
| 841 | |
| 842 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, |
| 843 | cb->nlh->nlmsg_type, sizeof(*t)); |
| 844 | t = NLMSG_DATA(nlh); |
| 845 | t->tca_family = AF_UNSPEC; |
| 846 | |
| 847 | x = (struct rtattr *) skb->tail; |
| 848 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
| 849 | |
| 850 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); |
| 851 | if (ret < 0) |
| 852 | goto rtattr_failure; |
| 853 | |
| 854 | if (ret > 0) { |
| 855 | x->rta_len = skb->tail - (u8 *) x; |
| 856 | ret = skb->len; |
| 857 | } else |
| 858 | skb_trim(skb, (u8*)x - skb->data); |
| 859 | |
| 860 | nlh->nlmsg_len = skb->tail - b; |
| 861 | if (NETLINK_CB(cb->skb).pid && ret) |
| 862 | nlh->nlmsg_flags |= NLM_F_MULTI; |
| 863 | module_put(a_o->owner); |
| 864 | return skb->len; |
| 865 | |
| 866 | rtattr_failure: |
| 867 | nlmsg_failure: |
| 868 | module_put(a_o->owner); |
| 869 | skb_trim(skb, b - skb->data); |
| 870 | return skb->len; |
| 871 | } |
| 872 | |
| 873 | static int __init tc_action_init(void) |
| 874 | { |
| 875 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; |
| 876 | |
| 877 | if (link_p) { |
| 878 | link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action; |
| 879 | link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action; |
| 880 | link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action; |
| 881 | link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action; |
| 882 | } |
| 883 | |
| 884 | printk("TC classifier action (bugs to netdev@oss.sgi.com cc " |
| 885 | "hadi@cyberus.ca)\n"); |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | subsys_initcall(tc_action_init); |
| 890 | |
| 891 | EXPORT_SYMBOL(tcf_register_action); |
| 892 | EXPORT_SYMBOL(tcf_unregister_action); |
| 893 | EXPORT_SYMBOL(tcf_action_exec); |
| 894 | EXPORT_SYMBOL(tcf_action_dump_1); |