2 * net/sched/cls_matchll.c Match-all classifier
4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
16 #include <net/sch_generic.h>
17 #include <net/pkt_cls.h>
19 struct cls_mall_head {
21 struct tcf_result res;
27 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
28 struct tcf_result *res)
30 struct cls_mall_head *head = rcu_dereference_bh(tp->root);
32 if (tc_skip_sw(head->flags))
35 return tcf_exts_exec(skb, &head->exts, res);
38 static int mall_init(struct tcf_proto *tp)
43 static void mall_destroy_rcu(struct rcu_head *rcu)
45 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
48 tcf_exts_destroy(&head->exts);
52 static int mall_replace_hw_filter(struct tcf_proto *tp,
53 struct cls_mall_head *head,
56 struct net_device *dev = tp->q->dev_queue->dev;
57 struct tc_to_netdev offload;
58 struct tc_cls_matchall_offload mall_offload = {0};
60 offload.type = TC_SETUP_MATCHALL;
61 offload.cls_mall = &mall_offload;
62 offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
63 offload.cls_mall->exts = &head->exts;
64 offload.cls_mall->cookie = cookie;
66 return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
70 static void mall_destroy_hw_filter(struct tcf_proto *tp,
71 struct cls_mall_head *head,
74 struct net_device *dev = tp->q->dev_queue->dev;
75 struct tc_to_netdev offload;
76 struct tc_cls_matchall_offload mall_offload = {0};
78 offload.type = TC_SETUP_MATCHALL;
79 offload.cls_mall = &mall_offload;
80 offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
81 offload.cls_mall->exts = NULL;
82 offload.cls_mall->cookie = cookie;
84 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
88 static bool mall_destroy(struct tcf_proto *tp, bool force)
90 struct cls_mall_head *head = rtnl_dereference(tp->root);
91 struct net_device *dev = tp->q->dev_queue->dev;
96 if (tc_should_offload(dev, tp, head->flags))
97 mall_destroy_hw_filter(tp, head, (unsigned long) head);
99 call_rcu(&head->rcu, mall_destroy_rcu);
103 static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
108 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
109 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
110 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
113 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
114 struct cls_mall_head *head,
115 unsigned long base, struct nlattr **tb,
116 struct nlattr *est, bool ovr)
121 tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
122 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
126 if (tb[TCA_MATCHALL_CLASSID]) {
127 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
128 tcf_bind_filter(tp, &head->res, base);
131 tcf_exts_change(tp, &head->exts, &e);
136 static int mall_change(struct net *net, struct sk_buff *in_skb,
137 struct tcf_proto *tp, unsigned long base,
138 u32 handle, struct nlattr **tca,
139 unsigned long *arg, bool ovr)
141 struct cls_mall_head *head = rtnl_dereference(tp->root);
142 struct net_device *dev = tp->q->dev_queue->dev;
143 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
144 struct cls_mall_head *new;
148 if (!tca[TCA_OPTIONS])
154 err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
155 tca[TCA_OPTIONS], mall_policy);
159 if (tb[TCA_MATCHALL_FLAGS]) {
160 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
161 if (!tc_flags_valid(flags))
165 new = kzalloc(sizeof(*new), GFP_KERNEL);
169 tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
173 new->handle = handle;
176 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
180 if (tc_should_offload(dev, tp, flags)) {
181 err = mall_replace_hw_filter(tp, new, (unsigned long) new);
183 if (tc_skip_sw(flags))
190 *arg = (unsigned long) head;
191 rcu_assign_pointer(tp->root, new);
193 call_rcu(&head->rcu, mall_destroy_rcu);
201 static int mall_delete(struct tcf_proto *tp, unsigned long arg)
206 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
208 struct cls_mall_head *head = rtnl_dereference(tp->root);
210 if (arg->count < arg->skip)
212 if (arg->fn(tp, (unsigned long) head, arg) < 0)
218 static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
219 struct sk_buff *skb, struct tcmsg *t)
221 struct cls_mall_head *head = (struct cls_mall_head *) fh;
227 t->tcm_handle = head->handle;
229 nest = nla_nest_start(skb, TCA_OPTIONS);
231 goto nla_put_failure;
233 if (head->res.classid &&
234 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
235 goto nla_put_failure;
237 if (tcf_exts_dump(skb, &head->exts))
238 goto nla_put_failure;
240 nla_nest_end(skb, nest);
242 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
243 goto nla_put_failure;
248 nla_nest_cancel(skb, nest);
252 static struct tcf_proto_ops cls_mall_ops __read_mostly = {
254 .classify = mall_classify,
256 .destroy = mall_destroy,
258 .change = mall_change,
259 .delete = mall_delete,
262 .owner = THIS_MODULE,
265 static int __init cls_mall_init(void)
267 return register_tcf_proto_ops(&cls_mall_ops);
270 static void __exit cls_mall_exit(void)
272 unregister_tcf_proto_ops(&cls_mall_ops);
275 module_init(cls_mall_init);
276 module_exit(cls_mall_exit);
278 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
279 MODULE_DESCRIPTION("Match-all classifier");
280 MODULE_LICENSE("GPL v2");