Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/cls_api.c Packet classifier 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 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * Changes: |
| 12 | * |
| 13 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <asm/uaccess.h> |
| 18 | #include <asm/system.h> |
| 19 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/socket.h> |
| 27 | #include <linux/sockios.h> |
| 28 | #include <linux/in.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/interrupt.h> |
| 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/rtnetlink.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/kmod.h> |
| 36 | #include <net/sock.h> |
| 37 | #include <net/pkt_sched.h> |
| 38 | #include <net/pkt_cls.h> |
| 39 | |
| 40 | #if 0 /* control */ |
| 41 | #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) |
| 42 | #else |
| 43 | #define DPRINTK(format,args...) |
| 44 | #endif |
| 45 | |
| 46 | /* The list of all installed classifier types */ |
| 47 | |
| 48 | static struct tcf_proto_ops *tcf_proto_base; |
| 49 | |
| 50 | /* Protects list of registered TC modules. It is pure SMP lock. */ |
| 51 | static DEFINE_RWLOCK(cls_mod_lock); |
| 52 | |
| 53 | /* Find classifier type by string name */ |
| 54 | |
| 55 | static struct tcf_proto_ops * tcf_proto_lookup_ops(struct rtattr *kind) |
| 56 | { |
| 57 | struct tcf_proto_ops *t = NULL; |
| 58 | |
| 59 | if (kind) { |
| 60 | read_lock(&cls_mod_lock); |
| 61 | for (t = tcf_proto_base; t; t = t->next) { |
| 62 | if (rtattr_strcmp(kind, t->kind) == 0) { |
| 63 | if (!try_module_get(t->owner)) |
| 64 | t = NULL; |
| 65 | break; |
| 66 | } |
| 67 | } |
| 68 | read_unlock(&cls_mod_lock); |
| 69 | } |
| 70 | return t; |
| 71 | } |
| 72 | |
| 73 | /* Register(unregister) new classifier type */ |
| 74 | |
| 75 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) |
| 76 | { |
| 77 | struct tcf_proto_ops *t, **tp; |
| 78 | int rc = -EEXIST; |
| 79 | |
| 80 | write_lock(&cls_mod_lock); |
| 81 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) |
| 82 | if (!strcmp(ops->kind, t->kind)) |
| 83 | goto out; |
| 84 | |
| 85 | ops->next = NULL; |
| 86 | *tp = ops; |
| 87 | rc = 0; |
| 88 | out: |
| 89 | write_unlock(&cls_mod_lock); |
| 90 | return rc; |
| 91 | } |
| 92 | |
| 93 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
| 94 | { |
| 95 | struct tcf_proto_ops *t, **tp; |
| 96 | int rc = -ENOENT; |
| 97 | |
| 98 | write_lock(&cls_mod_lock); |
| 99 | for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next) |
| 100 | if (t == ops) |
| 101 | break; |
| 102 | |
| 103 | if (!t) |
| 104 | goto out; |
| 105 | *tp = t->next; |
| 106 | rc = 0; |
| 107 | out: |
| 108 | write_unlock(&cls_mod_lock); |
| 109 | return rc; |
| 110 | } |
| 111 | |
| 112 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 113 | struct tcf_proto *tp, unsigned long fh, int event); |
| 114 | |
| 115 | |
| 116 | /* Select new prio value from the range, managed by kernel. */ |
| 117 | |
| 118 | static __inline__ u32 tcf_auto_prio(struct tcf_proto *tp) |
| 119 | { |
| 120 | u32 first = TC_H_MAKE(0xC0000000U,0U); |
| 121 | |
| 122 | if (tp) |
| 123 | first = tp->prio-1; |
| 124 | |
| 125 | return first; |
| 126 | } |
| 127 | |
| 128 | /* Add/change/delete/get a filter node */ |
| 129 | |
| 130 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 131 | { |
| 132 | struct rtattr **tca; |
| 133 | struct tcmsg *t; |
| 134 | u32 protocol; |
| 135 | u32 prio; |
| 136 | u32 nprio; |
| 137 | u32 parent; |
| 138 | struct net_device *dev; |
| 139 | struct Qdisc *q; |
| 140 | struct tcf_proto **back, **chain; |
| 141 | struct tcf_proto *tp; |
| 142 | struct tcf_proto_ops *tp_ops; |
| 143 | struct Qdisc_class_ops *cops; |
| 144 | unsigned long cl; |
| 145 | unsigned long fh; |
| 146 | int err; |
| 147 | |
| 148 | replay: |
| 149 | tca = arg; |
| 150 | t = NLMSG_DATA(n); |
| 151 | protocol = TC_H_MIN(t->tcm_info); |
| 152 | prio = TC_H_MAJ(t->tcm_info); |
| 153 | nprio = prio; |
| 154 | parent = t->tcm_parent; |
| 155 | cl = 0; |
| 156 | |
| 157 | if (prio == 0) { |
| 158 | /* If no priority is given, user wants we allocated it. */ |
| 159 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 160 | return -ENOENT; |
| 161 | prio = TC_H_MAKE(0x80000000U,0U); |
| 162 | } |
| 163 | |
| 164 | /* Find head of filter chain. */ |
| 165 | |
| 166 | /* Find link */ |
| 167 | if ((dev = __dev_get_by_index(t->tcm_ifindex)) == NULL) |
| 168 | return -ENODEV; |
| 169 | |
| 170 | /* Find qdisc */ |
| 171 | if (!parent) { |
| 172 | q = dev->qdisc_sleeping; |
| 173 | parent = q->handle; |
| 174 | } else if ((q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent))) == NULL) |
| 175 | return -EINVAL; |
| 176 | |
| 177 | /* Is it classful? */ |
| 178 | if ((cops = q->ops->cl_ops) == NULL) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | /* Do we search for filter, attached to class? */ |
| 182 | if (TC_H_MIN(parent)) { |
| 183 | cl = cops->get(q, parent); |
| 184 | if (cl == 0) |
| 185 | return -ENOENT; |
| 186 | } |
| 187 | |
| 188 | /* And the last stroke */ |
| 189 | chain = cops->tcf_chain(q, cl); |
| 190 | err = -EINVAL; |
| 191 | if (chain == NULL) |
| 192 | goto errout; |
| 193 | |
| 194 | /* Check the chain for existence of proto-tcf with this priority */ |
| 195 | for (back = chain; (tp=*back) != NULL; back = &tp->next) { |
| 196 | if (tp->prio >= prio) { |
| 197 | if (tp->prio == prio) { |
| 198 | if (!nprio || (tp->protocol != protocol && protocol)) |
| 199 | goto errout; |
| 200 | } else |
| 201 | tp = NULL; |
| 202 | break; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | if (tp == NULL) { |
| 207 | /* Proto-tcf does not exist, create new one */ |
| 208 | |
| 209 | if (tca[TCA_KIND-1] == NULL || !protocol) |
| 210 | goto errout; |
| 211 | |
| 212 | err = -ENOENT; |
| 213 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 214 | goto errout; |
| 215 | |
| 216 | |
| 217 | /* Create new proto tcf */ |
| 218 | |
| 219 | err = -ENOBUFS; |
Arnaldo Carvalho de Melo | c7b1b24 | 2006-11-21 01:19:40 -0200 | [diff] [blame] | 220 | if ((tp = kzalloc(sizeof(*tp), GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | goto errout; |
| 222 | err = -EINVAL; |
| 223 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND-1]); |
| 224 | if (tp_ops == NULL) { |
| 225 | #ifdef CONFIG_KMOD |
| 226 | struct rtattr *kind = tca[TCA_KIND-1]; |
| 227 | char name[IFNAMSIZ]; |
| 228 | |
| 229 | if (kind != NULL && |
| 230 | rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
| 231 | rtnl_unlock(); |
| 232 | request_module("cls_%s", name); |
| 233 | rtnl_lock(); |
| 234 | tp_ops = tcf_proto_lookup_ops(kind); |
| 235 | /* We dropped the RTNL semaphore in order to |
| 236 | * perform the module load. So, even if we |
| 237 | * succeeded in loading the module we have to |
| 238 | * replay the request. We indicate this using |
| 239 | * -EAGAIN. |
| 240 | */ |
| 241 | if (tp_ops != NULL) { |
| 242 | module_put(tp_ops->owner); |
| 243 | err = -EAGAIN; |
| 244 | } |
| 245 | } |
| 246 | #endif |
| 247 | kfree(tp); |
| 248 | goto errout; |
| 249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | tp->ops = tp_ops; |
| 251 | tp->protocol = protocol; |
| 252 | tp->prio = nprio ? : tcf_auto_prio(*back); |
| 253 | tp->q = q; |
| 254 | tp->classify = tp_ops->classify; |
| 255 | tp->classid = parent; |
| 256 | if ((err = tp_ops->init(tp)) != 0) { |
| 257 | module_put(tp_ops->owner); |
| 258 | kfree(tp); |
| 259 | goto errout; |
| 260 | } |
| 261 | |
| 262 | qdisc_lock_tree(dev); |
| 263 | tp->next = *back; |
| 264 | *back = tp; |
| 265 | qdisc_unlock_tree(dev); |
| 266 | |
| 267 | } else if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], tp->ops->kind)) |
| 268 | goto errout; |
| 269 | |
| 270 | fh = tp->ops->get(tp, t->tcm_handle); |
| 271 | |
| 272 | if (fh == 0) { |
| 273 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { |
| 274 | qdisc_lock_tree(dev); |
| 275 | *back = tp->next; |
| 276 | qdisc_unlock_tree(dev); |
| 277 | |
| 278 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); |
| 279 | tcf_destroy(tp); |
| 280 | err = 0; |
| 281 | goto errout; |
| 282 | } |
| 283 | |
| 284 | err = -ENOENT; |
| 285 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 286 | goto errout; |
| 287 | } else { |
| 288 | switch (n->nlmsg_type) { |
| 289 | case RTM_NEWTFILTER: |
| 290 | err = -EEXIST; |
| 291 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 292 | goto errout; |
| 293 | break; |
| 294 | case RTM_DELTFILTER: |
| 295 | err = tp->ops->delete(tp, fh); |
| 296 | if (err == 0) |
| 297 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); |
| 298 | goto errout; |
| 299 | case RTM_GETTFILTER: |
| 300 | err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); |
| 301 | goto errout; |
| 302 | default: |
| 303 | err = -EINVAL; |
| 304 | goto errout; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh); |
| 309 | if (err == 0) |
| 310 | tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); |
| 311 | |
| 312 | errout: |
| 313 | if (cl) |
| 314 | cops->put(q, cl); |
| 315 | if (err == -EAGAIN) |
| 316 | /* Replay the request. */ |
| 317 | goto replay; |
| 318 | return err; |
| 319 | } |
| 320 | |
| 321 | static int |
| 322 | tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh, |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 323 | u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | { |
| 325 | struct tcmsg *tcm; |
| 326 | struct nlmsghdr *nlh; |
| 327 | unsigned char *b = skb->tail; |
| 328 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 329 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | tcm = NLMSG_DATA(nlh); |
| 331 | tcm->tcm_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 332 | tcm->tcm__pad1 = 0; |
| 333 | tcm->tcm__pad1 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | tcm->tcm_ifindex = tp->q->dev->ifindex; |
| 335 | tcm->tcm_parent = tp->classid; |
| 336 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
| 337 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, tp->ops->kind); |
| 338 | tcm->tcm_handle = fh; |
| 339 | if (RTM_DELTFILTER != event) { |
| 340 | tcm->tcm_handle = 0; |
| 341 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) |
| 342 | goto rtattr_failure; |
| 343 | } |
| 344 | nlh->nlmsg_len = skb->tail - b; |
| 345 | return skb->len; |
| 346 | |
| 347 | nlmsg_failure: |
| 348 | rtattr_failure: |
| 349 | skb_trim(skb, b - skb->data); |
| 350 | return -1; |
| 351 | } |
| 352 | |
| 353 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 354 | struct tcf_proto *tp, unsigned long fh, int event) |
| 355 | { |
| 356 | struct sk_buff *skb; |
| 357 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 358 | |
| 359 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 360 | if (!skb) |
| 361 | return -ENOBUFS; |
| 362 | |
| 363 | if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) { |
| 364 | kfree_skb(skb); |
| 365 | return -EINVAL; |
| 366 | } |
| 367 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 368 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | struct tcf_dump_args |
| 372 | { |
| 373 | struct tcf_walker w; |
| 374 | struct sk_buff *skb; |
| 375 | struct netlink_callback *cb; |
| 376 | }; |
| 377 | |
| 378 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, struct tcf_walker *arg) |
| 379 | { |
| 380 | struct tcf_dump_args *a = (void*)arg; |
| 381 | |
| 382 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid, |
| 383 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
| 384 | } |
| 385 | |
| 386 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
| 387 | { |
| 388 | int t; |
| 389 | int s_t; |
| 390 | struct net_device *dev; |
| 391 | struct Qdisc *q; |
| 392 | struct tcf_proto *tp, **chain; |
| 393 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
| 394 | unsigned long cl = 0; |
| 395 | struct Qdisc_class_ops *cops; |
| 396 | struct tcf_dump_args arg; |
| 397 | |
| 398 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
| 399 | return skb->len; |
| 400 | if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL) |
| 401 | return skb->len; |
| 402 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 403 | read_lock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | if (!tcm->tcm_parent) |
| 405 | q = dev->qdisc_sleeping; |
| 406 | else |
| 407 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); |
| 408 | if (!q) |
| 409 | goto out; |
| 410 | if ((cops = q->ops->cl_ops) == NULL) |
| 411 | goto errout; |
| 412 | if (TC_H_MIN(tcm->tcm_parent)) { |
| 413 | cl = cops->get(q, tcm->tcm_parent); |
| 414 | if (cl == 0) |
| 415 | goto errout; |
| 416 | } |
| 417 | chain = cops->tcf_chain(q, cl); |
| 418 | if (chain == NULL) |
| 419 | goto errout; |
| 420 | |
| 421 | s_t = cb->args[0]; |
| 422 | |
| 423 | for (tp=*chain, t=0; tp; tp = tp->next, t++) { |
| 424 | if (t < s_t) continue; |
| 425 | if (TC_H_MAJ(tcm->tcm_info) && |
| 426 | TC_H_MAJ(tcm->tcm_info) != tp->prio) |
| 427 | continue; |
| 428 | if (TC_H_MIN(tcm->tcm_info) && |
| 429 | TC_H_MIN(tcm->tcm_info) != tp->protocol) |
| 430 | continue; |
| 431 | if (t > s_t) |
| 432 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 433 | if (cb->args[1] == 0) { |
| 434 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid, |
| 435 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER) <= 0) { |
| 436 | break; |
| 437 | } |
| 438 | cb->args[1] = 1; |
| 439 | } |
| 440 | if (tp->ops->walk == NULL) |
| 441 | continue; |
| 442 | arg.w.fn = tcf_node_dump; |
| 443 | arg.skb = skb; |
| 444 | arg.cb = cb; |
| 445 | arg.w.stop = 0; |
| 446 | arg.w.skip = cb->args[1]-1; |
| 447 | arg.w.count = 0; |
| 448 | tp->ops->walk(tp, &arg.w); |
| 449 | cb->args[1] = arg.w.count+1; |
| 450 | if (arg.w.stop) |
| 451 | break; |
| 452 | } |
| 453 | |
| 454 | cb->args[0] = t; |
| 455 | |
| 456 | errout: |
| 457 | if (cl) |
| 458 | cops->put(q, cl); |
| 459 | out: |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 460 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | dev_put(dev); |
| 462 | return skb->len; |
| 463 | } |
| 464 | |
| 465 | void |
| 466 | tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
| 467 | { |
| 468 | #ifdef CONFIG_NET_CLS_ACT |
| 469 | if (exts->action) { |
| 470 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); |
| 471 | exts->action = NULL; |
| 472 | } |
| 473 | #elif defined CONFIG_NET_CLS_POLICE |
| 474 | if (exts->police) { |
| 475 | tcf_police_release(exts->police, TCA_ACT_UNBIND); |
| 476 | exts->police = NULL; |
| 477 | } |
| 478 | #endif |
| 479 | } |
| 480 | |
| 481 | |
| 482 | int |
| 483 | tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb, |
| 484 | struct rtattr *rate_tlv, struct tcf_exts *exts, |
| 485 | struct tcf_ext_map *map) |
| 486 | { |
| 487 | memset(exts, 0, sizeof(*exts)); |
| 488 | |
| 489 | #ifdef CONFIG_NET_CLS_ACT |
| 490 | { |
| 491 | int err; |
| 492 | struct tc_action *act; |
| 493 | |
| 494 | if (map->police && tb[map->police-1]) { |
| 495 | act = tcf_action_init_1(tb[map->police-1], rate_tlv, "police", |
| 496 | TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err); |
| 497 | if (act == NULL) |
| 498 | return err; |
| 499 | |
| 500 | act->type = TCA_OLD_COMPAT; |
| 501 | exts->action = act; |
| 502 | } else if (map->action && tb[map->action-1]) { |
| 503 | act = tcf_action_init(tb[map->action-1], rate_tlv, NULL, |
| 504 | TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err); |
| 505 | if (act == NULL) |
| 506 | return err; |
| 507 | |
| 508 | exts->action = act; |
| 509 | } |
| 510 | } |
| 511 | #elif defined CONFIG_NET_CLS_POLICE |
| 512 | if (map->police && tb[map->police-1]) { |
| 513 | struct tcf_police *p; |
| 514 | |
| 515 | p = tcf_police_locate(tb[map->police-1], rate_tlv); |
| 516 | if (p == NULL) |
| 517 | return -EINVAL; |
| 518 | |
| 519 | exts->police = p; |
| 520 | } else if (map->action && tb[map->action-1]) |
| 521 | return -EOPNOTSUPP; |
| 522 | #else |
| 523 | if ((map->action && tb[map->action-1]) || |
| 524 | (map->police && tb[map->police-1])) |
| 525 | return -EOPNOTSUPP; |
| 526 | #endif |
| 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | void |
| 532 | tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
| 533 | struct tcf_exts *src) |
| 534 | { |
| 535 | #ifdef CONFIG_NET_CLS_ACT |
| 536 | if (src->action) { |
| 537 | struct tc_action *act; |
| 538 | tcf_tree_lock(tp); |
| 539 | act = xchg(&dst->action, src->action); |
| 540 | tcf_tree_unlock(tp); |
| 541 | if (act) |
| 542 | tcf_action_destroy(act, TCA_ACT_UNBIND); |
| 543 | } |
| 544 | #elif defined CONFIG_NET_CLS_POLICE |
| 545 | if (src->police) { |
| 546 | struct tcf_police *p; |
| 547 | tcf_tree_lock(tp); |
| 548 | p = xchg(&dst->police, src->police); |
| 549 | tcf_tree_unlock(tp); |
| 550 | if (p) |
| 551 | tcf_police_release(p, TCA_ACT_UNBIND); |
| 552 | } |
| 553 | #endif |
| 554 | } |
| 555 | |
| 556 | int |
| 557 | tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
| 558 | struct tcf_ext_map *map) |
| 559 | { |
| 560 | #ifdef CONFIG_NET_CLS_ACT |
| 561 | if (map->action && exts->action) { |
| 562 | /* |
| 563 | * again for backward compatible mode - we want |
| 564 | * to work with both old and new modes of entering |
| 565 | * tc data even if iproute2 was newer - jhs |
| 566 | */ |
| 567 | struct rtattr * p_rta = (struct rtattr*) skb->tail; |
| 568 | |
| 569 | if (exts->action->type != TCA_OLD_COMPAT) { |
| 570 | RTA_PUT(skb, map->action, 0, NULL); |
| 571 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
| 572 | goto rtattr_failure; |
| 573 | p_rta->rta_len = skb->tail - (u8*)p_rta; |
| 574 | } else if (map->police) { |
| 575 | RTA_PUT(skb, map->police, 0, NULL); |
| 576 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
| 577 | goto rtattr_failure; |
| 578 | p_rta->rta_len = skb->tail - (u8*)p_rta; |
| 579 | } |
| 580 | } |
| 581 | #elif defined CONFIG_NET_CLS_POLICE |
| 582 | if (map->police && exts->police) { |
| 583 | struct rtattr * p_rta = (struct rtattr*) skb->tail; |
| 584 | |
| 585 | RTA_PUT(skb, map->police, 0, NULL); |
| 586 | |
| 587 | if (tcf_police_dump(skb, exts->police) < 0) |
| 588 | goto rtattr_failure; |
| 589 | |
| 590 | p_rta->rta_len = skb->tail - (u8*)p_rta; |
| 591 | } |
| 592 | #endif |
| 593 | return 0; |
| 594 | rtattr_failure: __attribute__ ((unused)) |
| 595 | return -1; |
| 596 | } |
| 597 | |
| 598 | int |
| 599 | tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, |
| 600 | struct tcf_ext_map *map) |
| 601 | { |
| 602 | #ifdef CONFIG_NET_CLS_ACT |
| 603 | if (exts->action) |
| 604 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) |
| 605 | goto rtattr_failure; |
| 606 | #elif defined CONFIG_NET_CLS_POLICE |
| 607 | if (exts->police) |
| 608 | if (tcf_police_dump_stats(skb, exts->police) < 0) |
| 609 | goto rtattr_failure; |
| 610 | #endif |
| 611 | return 0; |
| 612 | rtattr_failure: __attribute__ ((unused)) |
| 613 | return -1; |
| 614 | } |
| 615 | |
| 616 | static int __init tc_filter_init(void) |
| 617 | { |
| 618 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; |
| 619 | |
| 620 | /* Setup rtnetlink links. It is made here to avoid |
| 621 | exporting large number of public symbols. |
| 622 | */ |
| 623 | |
| 624 | if (link_p) { |
| 625 | link_p[RTM_NEWTFILTER-RTM_BASE].doit = tc_ctl_tfilter; |
| 626 | link_p[RTM_DELTFILTER-RTM_BASE].doit = tc_ctl_tfilter; |
| 627 | link_p[RTM_GETTFILTER-RTM_BASE].doit = tc_ctl_tfilter; |
| 628 | link_p[RTM_GETTFILTER-RTM_BASE].dumpit = tc_dump_tfilter; |
| 629 | } |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | subsys_initcall(tc_filter_init); |
| 634 | |
| 635 | EXPORT_SYMBOL(register_tcf_proto_ops); |
| 636 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
| 637 | EXPORT_SYMBOL(tcf_exts_validate); |
| 638 | EXPORT_SYMBOL(tcf_exts_destroy); |
| 639 | EXPORT_SYMBOL(tcf_exts_change); |
| 640 | EXPORT_SYMBOL(tcf_exts_dump); |
| 641 | EXPORT_SYMBOL(tcf_exts_dump_stats); |