// SPDX-License-Identifier: GPL-2.0-or-later/* * net/sched/cls_basic.c	Basic Packet Classifier. * * 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 <linux/idr.h>#include <linux/percpu.h>#include <net/netlink.h>#include <net/act_api.h>#include <net/pkt_cls.h>#include <net/tc_wrapper.h> struct basic_head {	struct list_head	flist;	struct idr		handle_idr;	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 tc_basic_pcnt __percpu *pf;	struct rcu_work		rwork;}; TC_INDIRECT_SCOPE 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) {		__this_cpu_inc(f->pf->rcnt);		if (!tcf_em_tree_match(skb, &f->ematches, NULL))			continue;		__this_cpu_inc(f->pf->rhit);		*res = f->res;		r = tcf_exts_exec(skb, &f->exts, res);		if (r < 0)			continue;		return r;	}	return -1;} static void *basic_get(struct tcf_proto *tp, u32 handle){	struct basic_head *head = rtnl_dereference(tp->root);	struct basic_filter *f; 	list_for_each_entry(f, &head->flist, link) {		if (f->handle == handle) {			return f;		}	} 	return NULL;} static int basic_init(struct tcf_proto *tp){	struct basic_head *head; 	head = kzalloc_obj(*head);	if (head == NULL)		return -ENOBUFS;	INIT_LIST_HEAD(&head->flist);	idr_init(&head->handle_idr);	rcu_assign_pointer(tp->root, head);	return 0;} static void __basic_delete_filter(struct basic_filter *f){	tcf_exts_destroy(&f->exts);	tcf_em_tree_destroy(&f->ematches);	tcf_exts_put_net(&f->exts);	free_percpu(f->pf);	kfree(f);} static void basic_delete_filter_work(struct work_struct *work){	struct basic_filter *f = container_of(to_rcu_work(work),					      struct basic_filter,					      rwork);	rtnl_lock();	__basic_delete_filter(f);	rtnl_unlock();} static void basic_destroy(struct tcf_proto *tp, bool rtnl_held,			  struct netlink_ext_ack *extack){	struct basic_head *head = rtnl_dereference(tp->root);	struct basic_filter *f, *n; 	list_for_each_entry_safe(f, n, &head->flist, link) {		list_del_rcu(&f->link);		tcf_unbind_filter(tp, &f->res);		idr_remove(&head->handle_idr, f->handle);		if (tcf_exts_get_net(&f->exts))			tcf_queue_work(&f->rwork, basic_delete_filter_work);		else			__basic_delete_filter(f);	}	idr_destroy(&head->handle_idr);	kfree_rcu(head, rcu);} static int basic_delete(struct tcf_proto *tp, void *arg, bool *last,			bool rtnl_held, struct netlink_ext_ack *extack){	struct basic_head *head = rtnl_dereference(tp->root);	struct basic_filter *f = arg; 	list_del_rcu(&f->link);	tcf_unbind_filter(tp, &f->res);	idr_remove(&head->handle_idr, f->handle);	tcf_exts_get_net(&f->exts);	tcf_queue_work(&f->rwork, basic_delete_filter_work);	*last = list_empty(&head->flist);	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, u32 flags,			   struct netlink_ext_ack *extack){	int err; 	err = tcf_exts_validate(net, tp, tb, est, &f->exts, flags, extack);	if (err < 0)		return err; 	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);	if (err < 0)		return err; 	if (tb[TCA_BASIC_CLASSID]) {		f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);		tcf_bind_filter(tp, &f->res, base);	} 	f->tp = tp;	return 0;} static int basic_change(struct net *net, struct sk_buff *in_skb,			struct tcf_proto *tp, unsigned long base, u32 handle,			struct nlattr **tca, void **arg,			u32 flags, struct netlink_ext_ack *extack){	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_deprecated(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],					  basic_policy, NULL);	if (err < 0)		return err; 	if (fold != NULL) {		if (handle && fold->handle != handle)			return -EINVAL;	} 	fnew = kzalloc_obj(*fnew, GFP_KERNEL_ACCOUNT);	if (!fnew)		return -ENOBUFS; 	err = tcf_exts_init(&fnew->exts, net, TCA_BASIC_ACT, TCA_BASIC_POLICE);	if (err < 0)		goto errout; 	if (!handle) {		handle = 1;		err = idr_alloc_u32(&head->handle_idr, fnew, &handle,				    INT_MAX, GFP_KERNEL);	} else if (!fold) {		err = idr_alloc_u32(&head->handle_idr, fnew, &handle,				    handle, GFP_KERNEL);	}	if (err)		goto errout;	fnew->handle = handle;	fnew->pf = alloc_percpu_gfp(struct tc_basic_pcnt, GFP_KERNEL_ACCOUNT);	if (!fnew->pf) {		err = -ENOMEM;		if (!fold)			idr_remove(&head->handle_idr, fnew->handle);		goto errout;	} 	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], flags,			      extack);	if (err < 0) {		if (!fold)			idr_remove(&head->handle_idr, fnew->handle);		goto errout;	} 	*arg = fnew; 	if (fold) {		idr_replace(&head->handle_idr, fnew, fnew->handle);		list_replace_rcu(&fold->link, &fnew->link);		tcf_unbind_filter(tp, &fold->res);		tcf_exts_get_net(&fold->exts);		tcf_queue_work(&fold->rwork, basic_delete_filter_work);	} else {		list_add_rcu(&fnew->link, &head->flist);	} 	return 0;errout:	free_percpu(fnew->pf);	tcf_exts_destroy(&fnew->exts);	kfree(fnew);	return err;} static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg,		       bool rtnl_held){	struct basic_head *head = rtnl_dereference(tp->root);	struct basic_filter *f; 	list_for_each_entry(f, &head->flist, link) {		if (!tc_cls_stats_dump(tp, arg, f))			break;	}} static void basic_bind_class(void *fh, u32 classid, unsigned long cl, void *q,			     unsigned long base){	struct basic_filter *f = fh; 	tc_cls_bind_class(classid, cl, q, &f->res, base);} static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,		      struct sk_buff *skb, struct tcmsg *t, bool rtnl_held){	struct tc_basic_pcnt gpf = {};	struct basic_filter *f = fh;	struct nlattr *nest;	int cpu; 	if (f == NULL)		return skb->len; 	t->tcm_handle = f->handle; 	nest = nla_nest_start_noflag(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; 	for_each_possible_cpu(cpu) {		struct tc_basic_pcnt *pf = per_cpu_ptr(f->pf, cpu); 		gpf.rcnt += pf->rcnt;		gpf.rhit += pf->rhit;	} 	if (nla_put_64bit(skb, TCA_BASIC_PCNT,			  sizeof(struct tc_basic_pcnt),			  &gpf, TCA_BASIC_PAD))		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,	.bind_class	=	basic_bind_class,	.owner		=	THIS_MODULE,};MODULE_ALIAS_NET_CLS("basic"); 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_DESCRIPTION("TC basic classifier");MODULE_LICENSE("GPL");