315 lines
6.8 KiB
C
315 lines
6.8 KiB
C
/*
|
|
* 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;
|
|
|
|
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);
|
|
}
|
|
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;
|
|
|
|
err = tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);
|
|
if (err < 0)
|
|
return err;
|
|
err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
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;
|
|
|
|
err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
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:
|
|
tcf_exts_destroy(&fnew->exts);
|
|
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");
|
|
|