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>
31 #include <net/sch_generic.h>
37 struct fw_filter __rcu *ht[HTSIZE];
42 struct fw_filter __rcu *next;
44 struct tcf_result res;
45 #ifdef CONFIG_NET_CLS_IND
47 #endif /* CONFIG_NET_CLS_IND */
50 struct rcu_work rwork;
53 static u32 fw_hash(u32 handle)
55 handle ^= (handle >> 16);
56 handle ^= (handle >> 8);
57 return handle % HTSIZE;
60 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
61 struct tcf_result *res)
63 struct fw_head *head = rcu_dereference_bh(tp->root);
71 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
72 f = rcu_dereference_bh(f->next)) {
75 #ifdef CONFIG_NET_CLS_IND
76 if (!tcf_match_indev(skb, f->ifindex))
78 #endif /* CONFIG_NET_CLS_IND */
79 r = tcf_exts_exec(skb, &f->exts, res);
87 struct Qdisc *q = tcf_block_q(tp->chain->block);
89 /* Old method: classify the packet using its skb mark. */
90 if (id && (TC_H_MAJ(id) == 0 ||
91 !(TC_H_MAJ(id ^ q->handle)))) {
101 static void *fw_get(struct tcf_proto *tp, u32 handle)
103 struct fw_head *head = rtnl_dereference(tp->root);
109 f = rtnl_dereference(head->ht[fw_hash(handle)]);
110 for (; f; f = rtnl_dereference(f->next)) {
117 static int fw_init(struct tcf_proto *tp)
119 /* We don't allocate fw_head here, because in the old method
120 * we don't need it at all.
125 static void __fw_delete_filter(struct fw_filter *f)
127 tcf_exts_destroy(&f->exts);
128 tcf_exts_put_net(&f->exts);
132 static void fw_delete_filter_work(struct work_struct *work)
134 struct fw_filter *f = container_of(to_rcu_work(work),
138 __fw_delete_filter(f);
142 static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
143 struct netlink_ext_ack *extack)
145 struct fw_head *head = rtnl_dereference(tp->root);
152 for (h = 0; h < HTSIZE; h++) {
153 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
154 RCU_INIT_POINTER(head->ht[h],
155 rtnl_dereference(f->next));
156 tcf_unbind_filter(tp, &f->res);
157 if (tcf_exts_get_net(&f->exts))
158 tcf_queue_work(&f->rwork, fw_delete_filter_work);
160 __fw_delete_filter(f);
163 kfree_rcu(head, rcu);
166 static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
167 bool rtnl_held, struct netlink_ext_ack *extack)
169 struct fw_head *head = rtnl_dereference(tp->root);
170 struct fw_filter *f = arg;
171 struct fw_filter __rcu **fp;
172 struct fw_filter *pfp;
176 if (head == NULL || f == NULL)
179 fp = &head->ht[fw_hash(f->id)];
181 for (pfp = rtnl_dereference(*fp); pfp;
182 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
184 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
185 tcf_unbind_filter(tp, &f->res);
186 tcf_exts_get_net(&f->exts);
187 tcf_queue_work(&f->rwork, fw_delete_filter_work);
194 for (h = 0; h < HTSIZE; h++) {
195 if (rcu_access_pointer(head->ht[h])) {
205 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
206 [TCA_FW_CLASSID] = { .type = NLA_U32 },
207 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
208 [TCA_FW_MASK] = { .type = NLA_U32 },
211 static int fw_set_parms(struct net *net, struct tcf_proto *tp,
212 struct fw_filter *f, struct nlattr **tb,
213 struct nlattr **tca, unsigned long base, bool ovr,
214 struct netlink_ext_ack *extack)
216 struct fw_head *head = rtnl_dereference(tp->root);
220 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
225 if (tb[TCA_FW_CLASSID]) {
226 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
227 tcf_bind_filter(tp, &f->res, base);
230 #ifdef CONFIG_NET_CLS_IND
231 if (tb[TCA_FW_INDEV]) {
233 ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
238 #endif /* CONFIG_NET_CLS_IND */
241 if (tb[TCA_FW_MASK]) {
242 mask = nla_get_u32(tb[TCA_FW_MASK]);
243 if (mask != head->mask)
245 } else if (head->mask != 0xFFFFFFFF)
251 static int fw_change(struct net *net, struct sk_buff *in_skb,
252 struct tcf_proto *tp, unsigned long base,
253 u32 handle, struct nlattr **tca, void **arg,
254 bool ovr, bool rtnl_held,
255 struct netlink_ext_ack *extack)
257 struct fw_head *head = rtnl_dereference(tp->root);
258 struct fw_filter *f = *arg;
259 struct nlattr *opt = tca[TCA_OPTIONS];
260 struct nlattr *tb[TCA_FW_MAX + 1];
264 return handle ? -EINVAL : 0; /* Succeed if it is old method. */
266 err = nla_parse_nested_deprecated(tb, TCA_FW_MAX, opt, fw_policy,
272 struct fw_filter *pfp, *fnew;
273 struct fw_filter __rcu **fp;
275 if (f->id != handle && handle)
278 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
284 #ifdef CONFIG_NET_CLS_IND
285 fnew->ifindex = f->ifindex;
286 #endif /* CONFIG_NET_CLS_IND */
289 err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
296 err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
298 tcf_exts_destroy(&fnew->exts);
303 fp = &head->ht[fw_hash(fnew->id)];
304 for (pfp = rtnl_dereference(*fp); pfp;
305 fp = &pfp->next, pfp = rtnl_dereference(*fp))
309 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
310 rcu_assign_pointer(*fp, fnew);
311 tcf_unbind_filter(tp, &f->res);
312 tcf_exts_get_net(&f->exts);
313 tcf_queue_work(&f->rwork, fw_delete_filter_work);
323 u32 mask = 0xFFFFFFFF;
325 mask = nla_get_u32(tb[TCA_FW_MASK]);
327 head = kzalloc(sizeof(*head), GFP_KERNEL);
332 rcu_assign_pointer(tp->root, head);
335 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
339 err = tcf_exts_init(&f->exts, net, TCA_FW_ACT, TCA_FW_POLICE);
345 err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
349 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
350 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
356 tcf_exts_destroy(&f->exts);
361 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg,
364 struct fw_head *head = rtnl_dereference(tp->root);
373 for (h = 0; h < HTSIZE; h++) {
376 for (f = rtnl_dereference(head->ht[h]); f;
377 f = rtnl_dereference(f->next)) {
378 if (arg->count < arg->skip) {
382 if (arg->fn(tp, f, arg) < 0) {
391 static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
392 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
394 struct fw_head *head = rtnl_dereference(tp->root);
395 struct fw_filter *f = fh;
401 t->tcm_handle = f->id;
403 if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
406 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
408 goto nla_put_failure;
410 if (f->res.classid &&
411 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
412 goto nla_put_failure;
413 #ifdef CONFIG_NET_CLS_IND
415 struct net_device *dev;
416 dev = __dev_get_by_index(net, f->ifindex);
417 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
418 goto nla_put_failure;
420 #endif /* CONFIG_NET_CLS_IND */
421 if (head->mask != 0xFFFFFFFF &&
422 nla_put_u32(skb, TCA_FW_MASK, head->mask))
423 goto nla_put_failure;
425 if (tcf_exts_dump(skb, &f->exts) < 0)
426 goto nla_put_failure;
428 nla_nest_end(skb, nest);
430 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
431 goto nla_put_failure;
436 nla_nest_cancel(skb, nest);
440 static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
442 struct fw_filter *f = fh;
444 if (f && f->res.classid == classid)
448 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
450 .classify = fw_classify,
452 .destroy = fw_destroy,
458 .bind_class = fw_bind_class,
459 .owner = THIS_MODULE,
462 static int __init init_fw(void)
464 return register_tcf_proto_ops(&cls_fw_ops);
467 static void __exit exit_fw(void)
469 unregister_tcf_proto_ops(&cls_fw_ops);
474 MODULE_LICENSE("GPL");