2 * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
13 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
14 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
16 * JHS: We should remove the CONFIG_NET_CLS_IND from here
17 * eventually when the meta match extension is made available
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
27 #include <linux/skbuff.h>
28 #include <net/netlink.h>
29 #include <net/act_api.h>
30 #include <net/pkt_cls.h>
36 struct fw_filter __rcu *ht[HTSIZE];
41 struct fw_filter __rcu *next;
43 struct tcf_result res;
44 #ifdef CONFIG_NET_CLS_IND
46 #endif /* CONFIG_NET_CLS_IND */
52 static u32 fw_hash(u32 handle)
54 handle ^= (handle >> 16);
55 handle ^= (handle >> 8);
56 return handle % HTSIZE;
59 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
60 struct tcf_result *res)
62 struct fw_head *head = rcu_dereference_bh(tp->root);
70 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
71 f = rcu_dereference_bh(f->next)) {
74 #ifdef CONFIG_NET_CLS_IND
75 if (!tcf_match_indev(skb, f->ifindex))
77 #endif /* CONFIG_NET_CLS_IND */
78 r = tcf_exts_exec(skb, &f->exts, res);
87 if (id && (TC_H_MAJ(id) == 0 ||
88 !(TC_H_MAJ(id ^ tp->q->handle)))) {
98 static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
100 struct fw_head *head = rtnl_dereference(tp->root);
106 f = rtnl_dereference(head->ht[fw_hash(handle)]);
107 for (; f; f = rtnl_dereference(f->next)) {
109 return (unsigned long)f;
114 static void fw_put(struct tcf_proto *tp, unsigned long f)
118 static int fw_init(struct tcf_proto *tp)
123 static void fw_delete_filter(struct rcu_head *head)
125 struct fw_filter *f = container_of(head, struct fw_filter, rcu);
127 tcf_exts_destroy(&f->exts);
131 static void fw_destroy(struct tcf_proto *tp)
133 struct fw_head *head = rtnl_dereference(tp->root);
140 for (h = 0; h < HTSIZE; h++) {
141 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
142 RCU_INIT_POINTER(head->ht[h],
143 rtnl_dereference(f->next));
144 tcf_unbind_filter(tp, &f->res);
145 call_rcu(&f->rcu, fw_delete_filter);
148 RCU_INIT_POINTER(tp->root, NULL);
149 kfree_rcu(head, rcu);
152 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
154 struct fw_head *head = rtnl_dereference(tp->root);
155 struct fw_filter *f = (struct fw_filter *)arg;
156 struct fw_filter __rcu **fp;
157 struct fw_filter *pfp;
159 if (head == NULL || f == NULL)
162 fp = &head->ht[fw_hash(f->id)];
164 for (pfp = rtnl_dereference(*fp); pfp;
165 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
167 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
168 tcf_unbind_filter(tp, &f->res);
169 call_rcu(&f->rcu, fw_delete_filter);
177 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
178 [TCA_FW_CLASSID] = { .type = NLA_U32 },
179 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
180 [TCA_FW_MASK] = { .type = NLA_U32 },
184 fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
185 struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr)
187 struct fw_head *head = rtnl_dereference(tp->root);
192 tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
193 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
197 if (tb[TCA_FW_CLASSID]) {
198 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
199 tcf_bind_filter(tp, &f->res, base);
202 #ifdef CONFIG_NET_CLS_IND
203 if (tb[TCA_FW_INDEV]) {
205 ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
212 #endif /* CONFIG_NET_CLS_IND */
215 if (tb[TCA_FW_MASK]) {
216 mask = nla_get_u32(tb[TCA_FW_MASK]);
217 if (mask != head->mask)
219 } else if (head->mask != 0xFFFFFFFF)
222 tcf_exts_change(tp, &f->exts, &e);
226 tcf_exts_destroy(&e);
230 static int fw_change(struct net *net, struct sk_buff *in_skb,
231 struct tcf_proto *tp, unsigned long base,
234 unsigned long *arg, bool ovr)
236 struct fw_head *head = rtnl_dereference(tp->root);
237 struct fw_filter *f = (struct fw_filter *) *arg;
238 struct nlattr *opt = tca[TCA_OPTIONS];
239 struct nlattr *tb[TCA_FW_MAX + 1];
243 return handle ? -EINVAL : 0;
245 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
250 struct fw_filter *pfp, *fnew;
251 struct fw_filter __rcu **fp;
253 if (f->id != handle && handle)
256 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
262 #ifdef CONFIG_NET_CLS_IND
263 fnew->ifindex = f->ifindex;
264 #endif /* CONFIG_NET_CLS_IND */
267 tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
269 err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
275 fp = &head->ht[fw_hash(fnew->id)];
276 for (pfp = rtnl_dereference(*fp); pfp;
277 fp = &pfp->next, pfp = rtnl_dereference(*fp))
281 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
282 rcu_assign_pointer(*fp, fnew);
283 tcf_unbind_filter(tp, &f->res);
284 call_rcu(&f->rcu, fw_delete_filter);
286 *arg = (unsigned long)fnew;
294 u32 mask = 0xFFFFFFFF;
296 mask = nla_get_u32(tb[TCA_FW_MASK]);
298 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
303 rcu_assign_pointer(tp->root, head);
306 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
310 tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
314 err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
318 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
319 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
321 *arg = (unsigned long)f;
329 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
331 struct fw_head *head = rtnl_dereference(tp->root);
340 for (h = 0; h < HTSIZE; h++) {
343 for (f = rtnl_dereference(head->ht[h]); f;
344 f = rtnl_dereference(f->next)) {
345 if (arg->count < arg->skip) {
349 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
358 static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
359 struct sk_buff *skb, struct tcmsg *t)
361 struct fw_head *head = rtnl_dereference(tp->root);
362 struct fw_filter *f = (struct fw_filter *)fh;
363 unsigned char *b = skb_tail_pointer(skb);
369 t->tcm_handle = f->id;
371 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
374 nest = nla_nest_start(skb, TCA_OPTIONS);
376 goto nla_put_failure;
378 if (f->res.classid &&
379 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
380 goto nla_put_failure;
381 #ifdef CONFIG_NET_CLS_IND
383 struct net_device *dev;
384 dev = __dev_get_by_index(net, f->ifindex);
385 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
386 goto nla_put_failure;
388 #endif /* CONFIG_NET_CLS_IND */
389 if (head->mask != 0xFFFFFFFF &&
390 nla_put_u32(skb, TCA_FW_MASK, head->mask))
391 goto nla_put_failure;
393 if (tcf_exts_dump(skb, &f->exts) < 0)
394 goto nla_put_failure;
396 nla_nest_end(skb, nest);
398 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
399 goto nla_put_failure;
408 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
410 .classify = fw_classify,
412 .destroy = fw_destroy,
419 .owner = THIS_MODULE,
422 static int __init init_fw(void)
424 return register_tcf_proto_ops(&cls_fw_ops);
427 static void __exit exit_fw(void)
429 unregister_tcf_proto_ops(&cls_fw_ops);
434 MODULE_LICENSE("GPL");