--- /dev/null
+/*
+ * net/sched/cls_basic.c Basic Packet Classifier.
+ *
+ * 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.
+ *
+ * Authors: Thomas Graf <tgraf@suug.ch>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+
+struct basic_head {
+ u32 hgenerator;
+ struct list_head flist;
+ struct rcu_head rcu;
+};
+
+struct basic_filter {
+ u32 handle;
+ struct tcf_exts exts;
+ struct tcf_ematch_tree ematches;
+ struct tcf_result res;
+ struct tcf_proto *tp;
+ struct list_head link;
+ struct rcu_head rcu;
+};
+
+static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+ struct tcf_result *res)
+{
+ int r;
+ struct basic_head *head = rcu_dereference_bh(tp->root);
+ struct basic_filter *f;
+
+ list_for_each_entry_rcu(f, &head->flist, link) {
+ if (!tcf_em_tree_match(skb, &f->ematches, NULL))
+ continue;
+ *res = f->res;
+ r = tcf_exts_exec(skb, &f->exts, res);
+ if (r < 0)
+ continue;
+ return r;
+ }
+ return -1;
+}
+
+static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
+{
+ unsigned long l = 0UL;
+ struct basic_head *head = rtnl_dereference(tp->root);
+ struct basic_filter *f;
+
+ if (head == NULL)
+ return 0UL;
+
+ list_for_each_entry(f, &head->flist, link) {
+ if (f->handle == handle) {
+ l = (unsigned long) f;
+ break;
+ }
+ }
+
+ return l;
+}
+
+static int basic_init(struct tcf_proto *tp)
+{
+ struct basic_head *head;
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (head == NULL)
+ return -ENOBUFS;
+ INIT_LIST_HEAD(&head->flist);
+ rcu_assign_pointer(tp->root, head);
+ return 0;
+}
+
+static void basic_delete_filter(struct rcu_head *head)
+{
+ struct basic_filter *f = container_of(head, struct basic_filter, rcu);
+
+ tcf_exts_destroy(&f->exts);
+ tcf_em_tree_destroy(&f->ematches);
+ kfree(f);
+}
+
+static bool basic_destroy(struct tcf_proto *tp, bool force)
+{
+ struct basic_head *head = rtnl_dereference(tp->root);
+ struct basic_filter *f, *n;
+
+ if (!force && !list_empty(&head->flist))
+ return false;
+
+ list_for_each_entry_safe(f, n, &head->flist, link) {
+ list_del_rcu(&f->link);
+ tcf_unbind_filter(tp, &f->res);
+ call_rcu(&f->rcu, basic_delete_filter);
+ }
+ RCU_INIT_POINTER(tp->root, NULL);
+ kfree_rcu(head, rcu);
+ return true;
+}
+
+static int basic_delete(struct tcf_proto *tp, unsigned long arg)
+{
+ struct basic_filter *f = (struct basic_filter *) arg;
+
+ list_del_rcu(&f->link);
+ tcf_unbind_filter(tp, &f->res);
+ call_rcu(&f->rcu, basic_delete_filter);
+ return 0;
+}
+
+static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
+ [TCA_BASIC_CLASSID] = { .type = NLA_U32 },
+ [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
+};
+
+static int basic_set_parms(struct net *net, struct tcf_proto *tp,
+ struct basic_filter *f, unsigned long base,
+ struct nlattr **tb,
+ struct nlattr *est, bool ovr)
+{
+ int err;
+ struct tcf_exts e;
+ struct tcf_ematch_tree t;
+
+ tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);
+ err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
+ if (err < 0)
+ return err;
+
+ err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);
+ if (err < 0)
+ goto errout;
+
+ if (tb[TCA_BASIC_CLASSID]) {
+ f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
+ tcf_bind_filter(tp, &f->res, base);
+ }
+
+ tcf_exts_change(tp, &f->exts, &e);
+ tcf_em_tree_change(tp, &f->ematches, &t);
+ f->tp = tp;
+
+ return 0;
+errout:
+ tcf_exts_destroy(&e);
+ return err;
+}
+
+static int basic_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)
+{
+ int err;
+ struct basic_head *head = rtnl_dereference(tp->root);
+ struct nlattr *tb[TCA_BASIC_MAX + 1];
+ struct basic_filter *fold = (struct basic_filter *) *arg;
+ struct basic_filter *fnew;
+
+ if (tca[TCA_OPTIONS] == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
+ basic_policy);
+ if (err < 0)
+ return err;
+
+ if (fold != NULL) {
+ if (handle && fold->handle != handle)
+ return -EINVAL;
+ }
+
+ fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
+ if (!fnew)
+ return -ENOBUFS;
+
+ tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);
+ err = -EINVAL;
+ if (handle) {
+ fnew->handle = handle;
+ } else if (fold) {
+ fnew->handle = fold->handle;
+ } else {
+ unsigned int i = 0x80000000;
+ do {
+ if (++head->hgenerator == 0x7FFFFFFF)
+ head->hgenerator = 1;
+ } while (--i > 0 && basic_get(tp, head->hgenerator));
+
+ if (i <= 0) {
+ pr_err("Insufficient number of handles\n");
+ goto errout;
+ }
+
+ fnew->handle = head->hgenerator;
+ }
+
+ err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
+ if (err < 0)
+ goto errout;
+
+ *arg = (unsigned long)fnew;
+
+ if (fold) {
+ list_replace_rcu(&fold->link, &fnew->link);
+ tcf_unbind_filter(tp, &fold->res);
+ call_rcu(&fold->rcu, basic_delete_filter);
+ } else {
+ list_add_rcu(&fnew->link, &head->flist);
+ }
+
+ return 0;
+errout:
+ kfree(fnew);
+ return err;
+}
+
+static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+ struct basic_head *head = rtnl_dereference(tp->root);
+ struct basic_filter *f;
+
+ list_for_each_entry(f, &head->flist, link) {
+ if (arg->count < arg->skip)
+ goto skip;
+
+ if (arg->fn(tp, (unsigned long) f, arg) < 0) {
+ arg->stop = 1;
+ break;
+ }
+skip:
+ arg->count++;
+ }
+}
+
+static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
+ struct sk_buff *skb, struct tcmsg *t)
+{
+ struct basic_filter *f = (struct basic_filter *) fh;
+ struct nlattr *nest;
+
+ if (f == NULL)
+ return skb->len;
+
+ t->tcm_handle = f->handle;
+
+ nest = nla_nest_start(skb, TCA_OPTIONS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (f->res.classid &&
+ nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid))
+ goto nla_put_failure;
+
+ if (tcf_exts_dump(skb, &f->exts) < 0 ||
+ tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
+ 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_basic_ops __read_mostly = {
+ .kind = "basic",
+ .classify = basic_classify,
+ .init = basic_init,
+ .destroy = basic_destroy,
+ .get = basic_get,
+ .change = basic_change,
+ .delete = basic_delete,
+ .walk = basic_walk,
+ .dump = basic_dump,
+ .owner = THIS_MODULE,
+};
+
+static int __init init_basic(void)
+{
+ return register_tcf_proto_ops(&cls_basic_ops);
+}
+
+static void __exit exit_basic(void)
+{
+ unregister_tcf_proto_ops(&cls_basic_ops);
+}
+
+module_init(init_basic)
+module_exit(exit_basic)
+MODULE_LICENSE("GPL");
+
Code Review / kvmfornfv.git / blobdiff