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-rw-r--r--net/sched/cls_matchall.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
new file mode 100644
index 000000000000..25927b6c4436
--- /dev/null
+++ b/net/sched/cls_matchall.c
@@ -0,0 +1,318 @@
+/*
+ * net/sched/cls_matchll.c Match-all classifier
+ *
+ * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <net/sch_generic.h>
+#include <net/pkt_cls.h>
+
+struct cls_mall_filter {
+ struct tcf_exts exts;
+ struct tcf_result res;
+ u32 handle;
+ struct rcu_head rcu;
+ u32 flags;
+};
+
+struct cls_mall_head {
+ struct cls_mall_filter *filter;
+ struct rcu_head rcu;
+};
+
+static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+ struct tcf_result *res)
+{
+ struct cls_mall_head *head = rcu_dereference_bh(tp->root);
+ struct cls_mall_filter *f = head->filter;
+
+ if (tc_skip_sw(f->flags))
+ return -1;
+
+ return tcf_exts_exec(skb, &f->exts, res);
+}
+
+static int mall_init(struct tcf_proto *tp)
+{
+ struct cls_mall_head *head;
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (!head)
+ return -ENOBUFS;
+
+ rcu_assign_pointer(tp->root, head);
+
+ return 0;
+}
+
+static void mall_destroy_filter(struct rcu_head *head)
+{
+ struct cls_mall_filter *f = container_of(head, struct cls_mall_filter, rcu);
+
+ tcf_exts_destroy(&f->exts);
+
+ kfree(f);
+}
+
+static int mall_replace_hw_filter(struct tcf_proto *tp,
+ struct cls_mall_filter *f,
+ unsigned long cookie)
+{
+ struct net_device *dev = tp->q->dev_queue->dev;
+ struct tc_to_netdev offload;
+ struct tc_cls_matchall_offload mall_offload = {0};
+
+ offload.type = TC_SETUP_MATCHALL;
+ offload.cls_mall = &mall_offload;
+ offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
+ offload.cls_mall->exts = &f->exts;
+ offload.cls_mall->cookie = cookie;
+
+ return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
+ &offload);
+}
+
+static void mall_destroy_hw_filter(struct tcf_proto *tp,
+ struct cls_mall_filter *f,
+ unsigned long cookie)
+{
+ struct net_device *dev = tp->q->dev_queue->dev;
+ struct tc_to_netdev offload;
+ struct tc_cls_matchall_offload mall_offload = {0};
+
+ offload.type = TC_SETUP_MATCHALL;
+ offload.cls_mall = &mall_offload;
+ offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
+ offload.cls_mall->exts = NULL;
+ offload.cls_mall->cookie = cookie;
+
+ dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
+ &offload);
+}
+
+static bool mall_destroy(struct tcf_proto *tp, bool force)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct net_device *dev = tp->q->dev_queue->dev;
+ struct cls_mall_filter *f = head->filter;
+
+ if (!force && f)
+ return false;
+
+ if (f) {
+ if (tc_should_offload(dev, tp, f->flags))
+ mall_destroy_hw_filter(tp, f, (unsigned long) f);
+
+ call_rcu(&f->rcu, mall_destroy_filter);
+ }
+ RCU_INIT_POINTER(tp->root, NULL);
+ kfree_rcu(head, rcu);
+ return true;
+}
+
+static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct cls_mall_filter *f = head->filter;
+
+ if (f && f->handle == handle)
+ return (unsigned long) f;
+ return 0;
+}
+
+static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
+ [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
+ [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
+};
+
+static int mall_set_parms(struct net *net, struct tcf_proto *tp,
+ struct cls_mall_filter *f,
+ unsigned long base, struct nlattr **tb,
+ struct nlattr *est, bool ovr)
+{
+ struct tcf_exts e;
+ int err;
+
+ tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
+ err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_MATCHALL_CLASSID]) {
+ f->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
+ tcf_bind_filter(tp, &f->res, base);
+ }
+
+ tcf_exts_change(tp, &f->exts, &e);
+
+ return 0;
+}
+
+static int mall_change(struct net *net, struct sk_buff *in_skb,
+ struct tcf_proto *tp, unsigned long base,
+ u32 handle, struct nlattr **tca,
+ unsigned long *arg, bool ovr)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct cls_mall_filter *fold = (struct cls_mall_filter *) *arg;
+ struct net_device *dev = tp->q->dev_queue->dev;
+ struct cls_mall_filter *f;
+ struct nlattr *tb[TCA_MATCHALL_MAX + 1];
+ u32 flags = 0;
+ int err;
+
+ if (!tca[TCA_OPTIONS])
+ return -EINVAL;
+
+ if (head->filter)
+ return -EBUSY;
+
+ if (fold)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
+ tca[TCA_OPTIONS], mall_policy);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_MATCHALL_FLAGS]) {
+ flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
+ if (!tc_flags_valid(flags))
+ return -EINVAL;
+ }
+
+ f = kzalloc(sizeof(*f), GFP_KERNEL);
+ if (!f)
+ return -ENOBUFS;
+
+ tcf_exts_init(&f->exts, TCA_MATCHALL_ACT, 0);
+
+ if (!handle)
+ handle = 1;
+ f->handle = handle;
+ f->flags = flags;
+
+ err = mall_set_parms(net, tp, f, base, tb, tca[TCA_RATE], ovr);
+ if (err)
+ goto errout;
+
+ if (tc_should_offload(dev, tp, flags)) {
+ err = mall_replace_hw_filter(tp, f, (unsigned long) f);
+ if (err) {
+ if (tc_skip_sw(flags))
+ goto errout;
+ else
+ err = 0;
+ }
+ }
+
+ *arg = (unsigned long) f;
+ rcu_assign_pointer(head->filter, f);
+
+ return 0;
+
+errout:
+ kfree(f);
+ return err;
+}
+
+static int mall_delete(struct tcf_proto *tp, unsigned long arg)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct cls_mall_filter *f = (struct cls_mall_filter *) arg;
+ struct net_device *dev = tp->q->dev_queue->dev;
+
+ if (tc_should_offload(dev, tp, f->flags))
+ mall_destroy_hw_filter(tp, f, (unsigned long) f);
+
+ RCU_INIT_POINTER(head->filter, NULL);
+ tcf_unbind_filter(tp, &f->res);
+ call_rcu(&f->rcu, mall_destroy_filter);
+ return 0;
+}
+
+static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct cls_mall_filter *f = head->filter;
+
+ if (arg->count < arg->skip)
+ goto skip;
+ if (arg->fn(tp, (unsigned long) f, arg) < 0)
+ arg->stop = 1;
+skip:
+ arg->count++;
+}
+
+static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
+ struct sk_buff *skb, struct tcmsg *t)
+{
+ struct cls_mall_filter *f = (struct cls_mall_filter *) fh;
+ struct nlattr *nest;
+
+ if (!f)
+ return skb->len;
+
+ t->tcm_handle = f->handle;
+
+ nest = nla_nest_start(skb, TCA_OPTIONS);
+ if (!nest)
+ goto nla_put_failure;
+
+ if (f->res.classid &&
+ nla_put_u32(skb, TCA_MATCHALL_CLASSID, f->res.classid))
+ goto nla_put_failure;
+
+ if (tcf_exts_dump(skb, &f->exts))
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+
+ if (tcf_exts_dump_stats(skb, &f->exts) < 0)
+ goto nla_put_failure;
+
+ return skb->len;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -1;
+}
+
+static struct tcf_proto_ops cls_mall_ops __read_mostly = {
+ .kind = "matchall",
+ .classify = mall_classify,
+ .init = mall_init,
+ .destroy = mall_destroy,
+ .get = mall_get,
+ .change = mall_change,
+ .delete = mall_delete,
+ .walk = mall_walk,
+ .dump = mall_dump,
+ .owner = THIS_MODULE,
+};
+
+static int __init cls_mall_init(void)
+{
+ return register_tcf_proto_ops(&cls_mall_ops);
+}
+
+static void __exit cls_mall_exit(void)
+{
+ unregister_tcf_proto_ops(&cls_mall_ops);
+}
+
+module_init(cls_mall_init);
+module_exit(cls_mall_exit);
+
+MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
+MODULE_DESCRIPTION("Match-all classifier");
+MODULE_LICENSE("GPL v2");