[mirror_ubuntu-bionic-kernel.git] / net / sched / cls_bpf.c

/*
 * Berkeley Packet Filter based traffic classifier
 *
 * Might be used to classify traffic through flexible, user-defined and
 * possibly JIT-ed BPF filters for traffic control as an alternative to
 * ematches.
 *
 * (C) 2013 Daniel Borkmann <dborkman@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/filter.h>
#include <linux/bpf.h>

#include <net/rtnetlink.h>
#include <net/pkt_cls.h>
#include <net/sock.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
MODULE_DESCRIPTION("TC BPF based classifier");

#define CLS_BPF_NAME_LEN	256
#define CLS_BPF_SUPPORTED_GEN_FLAGS		\
	(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)

struct cls_bpf_head {
	struct list_head plist;
	u32 hgen;
	struct rcu_head rcu;
};

struct cls_bpf_prog {
	struct bpf_prog *filter;
	struct list_head link;
	struct tcf_result res;
	bool exts_integrated;
	bool offloaded;
	u32 gen_flags;
	struct tcf_exts exts;
	u32 handle;
	union {
		u32 bpf_fd;
		u16 bpf_num_ops;
	};
	struct sock_filter *bpf_ops;
	const char *bpf_name;
	struct tcf_proto *tp;
	struct rcu_head rcu;
};

static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
	[TCA_BPF_CLASSID]	= { .type = NLA_U32 },
	[TCA_BPF_FLAGS]		= { .type = NLA_U32 },
	[TCA_BPF_FLAGS_GEN]	= { .type = NLA_U32 },
	[TCA_BPF_FD]		= { .type = NLA_U32 },
	[TCA_BPF_NAME]		= { .type = NLA_NUL_STRING,
				    .len = CLS_BPF_NAME_LEN },
	[TCA_BPF_OPS_LEN]	= { .type = NLA_U16 },
	[TCA_BPF_OPS]		= { .type = NLA_BINARY,
				    .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
};

static int cls_bpf_exec_opcode(int code)
{
	switch (code) {
	case TC_ACT_OK:
	case TC_ACT_SHOT:
	case TC_ACT_STOLEN:
	case TC_ACT_REDIRECT:
	case TC_ACT_UNSPEC:
		return code;
	default:
		return TC_ACT_UNSPEC;
	}
}

static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			    struct tcf_result *res)
{
	struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
	bool at_ingress = skb_at_tc_ingress(skb);
	struct cls_bpf_prog *prog;
	int ret = -1;

	/* Needed here for accessing maps. */
	rcu_read_lock();
	list_for_each_entry_rcu(prog, &head->plist, link) {
		int filter_res;

		qdisc_skb_cb(skb)->tc_classid = prog->res.classid;

		if (tc_skip_sw(prog->gen_flags)) {
			filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
		} else if (at_ingress) {
			/* It is safe to push/pull even if skb_shared() */
			__skb_push(skb, skb->mac_len);
			bpf_compute_data_end(skb);
			filter_res = BPF_PROG_RUN(prog->filter, skb);
			__skb_pull(skb, skb->mac_len);
		} else {
			bpf_compute_data_end(skb);
			filter_res = BPF_PROG_RUN(prog->filter, skb);
		}

		if (prog->exts_integrated) {
			res->class   = 0;
			res->classid = TC_H_MAJ(prog->res.classid) |
				       qdisc_skb_cb(skb)->tc_classid;

			ret = cls_bpf_exec_opcode(filter_res);
			if (ret == TC_ACT_UNSPEC)
				continue;
			break;
		}

		if (filter_res == 0)
			continue;
		if (filter_res != -1) {
			res->class   = 0;
			res->classid = filter_res;
		} else {
			*res = prog->res;
		}

		ret = tcf_exts_exec(skb, &prog->exts, res);
		if (ret < 0)
			continue;

		break;
	}
	rcu_read_unlock();

	return ret;
}

static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
{
	return !prog->bpf_ops;
}

static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
			       enum tc_clsbpf_command cmd)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_bpf_offload bpf_offload = {};
	struct tc_to_netdev offload;

	offload.type = TC_SETUP_CLSBPF;
	offload.cls_bpf = &bpf_offload;

	bpf_offload.command = cmd;
	bpf_offload.exts = &prog->exts;
	bpf_offload.prog = prog->filter;
	bpf_offload.name = prog->bpf_name;
	bpf_offload.exts_integrated = prog->exts_integrated;
	bpf_offload.gen_flags = prog->gen_flags;

	return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
					     tp->protocol, &offload);
}

static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
			   struct cls_bpf_prog *oldprog)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct cls_bpf_prog *obj = prog;
	enum tc_clsbpf_command cmd;
	bool skip_sw;
	int ret;

	skip_sw = tc_skip_sw(prog->gen_flags) ||
		(oldprog && tc_skip_sw(oldprog->gen_flags));

	if (oldprog && oldprog->offloaded) {
		if (tc_should_offload(dev, tp, prog->gen_flags)) {
			cmd = TC_CLSBPF_REPLACE;
		} else if (!tc_skip_sw(prog->gen_flags)) {
			obj = oldprog;
			cmd = TC_CLSBPF_DESTROY;
		} else {
			return -EINVAL;
		}
	} else {
		if (!tc_should_offload(dev, tp, prog->gen_flags))
			return skip_sw ? -EINVAL : 0;
		cmd = TC_CLSBPF_ADD;
	}

	ret = cls_bpf_offload_cmd(tp, obj, cmd);
	if (ret)
		return skip_sw ? ret : 0;

	obj->offloaded = true;
	if (oldprog)
		oldprog->offloaded = false;

	return 0;
}

static void cls_bpf_stop_offload(struct tcf_proto *tp,
				 struct cls_bpf_prog *prog)
{
	int err;

	if (!prog->offloaded)
		return;

	err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
	if (err) {
		pr_err("Stopping hardware offload failed: %d\n", err);
		return;
	}

	prog->offloaded = false;
}

static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
					 struct cls_bpf_prog *prog)
{
	if (!prog->offloaded)
		return;

	cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS);
}

static int cls_bpf_init(struct tcf_proto *tp)
{
	struct cls_bpf_head *head;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (head == NULL)
		return -ENOBUFS;

	INIT_LIST_HEAD_RCU(&head->plist);
	rcu_assign_pointer(tp->root, head);

	return 0;
}

static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
{
	tcf_exts_destroy(&prog->exts);

	if (cls_bpf_is_ebpf(prog))
		bpf_prog_put(prog->filter);
	else
		bpf_prog_destroy(prog->filter);

	kfree(prog->bpf_name);
	kfree(prog->bpf_ops);
	kfree(prog);
}

static void __cls_bpf_delete_prog(struct rcu_head *rcu)
{
	struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);

	cls_bpf_delete_prog(prog->tp, prog);
}

static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;

	cls_bpf_stop_offload(tp, prog);
	list_del_rcu(&prog->link);
	tcf_unbind_filter(tp, &prog->res);
	call_rcu(&prog->rcu, __cls_bpf_delete_prog);

	return 0;
}

static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
{
	struct cls_bpf_head *head = rtnl_dereference(tp->root);
	struct cls_bpf_prog *prog, *tmp;

	if (!force && !list_empty(&head->plist))
		return false;

	list_for_each_entry_safe(prog, tmp, &head->plist, link) {
		cls_bpf_stop_offload(tp, prog);
		list_del_rcu(&prog->link);
		tcf_unbind_filter(tp, &prog->res);
		call_rcu(&prog->rcu, __cls_bpf_delete_prog);
	}

	RCU_INIT_POINTER(tp->root, NULL);
	kfree_rcu(head, rcu);
	return true;
}

static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
{
	struct cls_bpf_head *head = rtnl_dereference(tp->root);
	struct cls_bpf_prog *prog;
	unsigned long ret = 0UL;

	if (head == NULL)
		return 0UL;

	list_for_each_entry(prog, &head->plist, link) {
		if (prog->handle == handle) {
			ret = (unsigned long) prog;
			break;
		}
	}

	return ret;
}

static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
{
	struct sock_filter *bpf_ops;
	struct sock_fprog_kern fprog_tmp;
	struct bpf_prog *fp;
	u16 bpf_size, bpf_num_ops;
	int ret;

	bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
	if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
		return -EINVAL;

	bpf_size = bpf_num_ops * sizeof(*bpf_ops);
	if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
		return -EINVAL;

	bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
	if (bpf_ops == NULL)
		return -ENOMEM;

	memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);

	fprog_tmp.len = bpf_num_ops;
	fprog_tmp.filter = bpf_ops;

	ret = bpf_prog_create(&fp, &fprog_tmp);
	if (ret < 0) {
		kfree(bpf_ops);
		return ret;
	}

	prog->bpf_ops = bpf_ops;
	prog->bpf_num_ops = bpf_num_ops;
	prog->bpf_name = NULL;
	prog->filter = fp;

	return 0;
}

static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
				 const struct tcf_proto *tp)
{
	struct bpf_prog *fp;
	char *name = NULL;
	u32 bpf_fd;

	bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);

	fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS);
	if (IS_ERR(fp))
		return PTR_ERR(fp);

	if (tb[TCA_BPF_NAME]) {
		name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
			       nla_len(tb[TCA_BPF_NAME]),
			       GFP_KERNEL);
		if (!name) {
			bpf_prog_put(fp);
			return -ENOMEM;
		}
	}

	prog->bpf_ops = NULL;
	prog->bpf_fd = bpf_fd;
	prog->bpf_name = name;
	prog->filter = fp;

	if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
		netif_keep_dst(qdisc_dev(tp->q));

	return 0;
}

static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
				   struct cls_bpf_prog *prog,
				   unsigned long base, struct nlattr **tb,
				   struct nlattr *est, bool ovr)
{
	bool is_bpf, is_ebpf, have_exts = false;
	struct tcf_exts exts;
	u32 gen_flags = 0;
	int ret;

	is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
	is_ebpf = tb[TCA_BPF_FD];
	if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
		return -EINVAL;

	ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);
	if (ret < 0)
		return ret;
	ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);
	if (ret < 0)
		goto errout;

	if (tb[TCA_BPF_FLAGS]) {
		u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);

		if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
			ret = -EINVAL;
			goto errout;
		}

		have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
	}
	if (tb[TCA_BPF_FLAGS_GEN]) {
		gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
		if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
		    !tc_flags_valid(gen_flags)) {
			ret = -EINVAL;
			goto errout;
		}
	}

	prog->exts_integrated = have_exts;
	prog->gen_flags = gen_flags;

	ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
		       cls_bpf_prog_from_efd(tb, prog, tp);
	if (ret < 0)
		goto errout;

	if (tb[TCA_BPF_CLASSID]) {
		prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
		tcf_bind_filter(tp, &prog->res, base);
	}

	tcf_exts_change(tp, &prog->exts, &exts);
	return 0;

errout:
	tcf_exts_destroy(&exts);
	return ret;
}

static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
				   struct cls_bpf_head *head)
{
	unsigned int i = 0x80000000;
	u32 handle;

	do {
		if (++head->hgen == 0x7FFFFFFF)
			head->hgen = 1;
	} while (--i > 0 && cls_bpf_get(tp, head->hgen));

	if (unlikely(i == 0)) {
		pr_err("Insufficient number of handles\n");
		handle = 0;
	} else {
		handle = head->hgen;
	}

	return handle;
}

static int cls_bpf_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_bpf_head *head = rtnl_dereference(tp->root);
	struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg;
	struct nlattr *tb[TCA_BPF_MAX + 1];
	struct cls_bpf_prog *prog;
	int ret;

	if (tca[TCA_OPTIONS] == NULL)
		return -EINVAL;

	ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
	if (ret < 0)
		return ret;

	prog = kzalloc(sizeof(*prog), GFP_KERNEL);
	if (!prog)
		return -ENOBUFS;

	ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
	if (ret < 0)
		goto errout;

	if (oldprog) {
		if (handle && oldprog->handle != handle) {
			ret = -EINVAL;
			goto errout;
		}
	}

	if (handle == 0)
		prog->handle = cls_bpf_grab_new_handle(tp, head);
	else
		prog->handle = handle;
	if (prog->handle == 0) {
		ret = -EINVAL;
		goto errout;
	}

	ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE],
				      ovr);
	if (ret < 0)
		goto errout;

	ret = cls_bpf_offload(tp, prog, oldprog);
	if (ret) {
		cls_bpf_delete_prog(tp, prog);
		return ret;
	}

	if (oldprog) {
		list_replace_rcu(&oldprog->link, &prog->link);
		tcf_unbind_filter(tp, &oldprog->res);
		call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
	} else {
		list_add_rcu(&prog->link, &head->plist);
	}

	*arg = (unsigned long) prog;
	return 0;

errout:
	tcf_exts_destroy(&prog->exts);
	kfree(prog);
	return ret;
}

static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
				 struct sk_buff *skb)
{
	struct nlattr *nla;

	if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
		return -EMSGSIZE;

	nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
			  sizeof(struct sock_filter));
	if (nla == NULL)
		return -EMSGSIZE;

	memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));

	return 0;
}

static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
				  struct sk_buff *skb)
{
	if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd))
		return -EMSGSIZE;

	if (prog->bpf_name &&
	    nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
		return -EMSGSIZE;

	return 0;
}

static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
			struct sk_buff *skb, struct tcmsg *tm)
{
	struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh;
	struct nlattr *nest;
	u32 bpf_flags = 0;
	int ret;

	if (prog == NULL)
		return skb->len;

	tm->tcm_handle = prog->handle;

	cls_bpf_offload_update_stats(tp, prog);

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	if (prog->res.classid &&
	    nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
		goto nla_put_failure;

	if (cls_bpf_is_ebpf(prog))
		ret = cls_bpf_dump_ebpf_info(prog, skb);
	else
		ret = cls_bpf_dump_bpf_info(prog, skb);
	if (ret)
		goto nla_put_failure;

	if (tcf_exts_dump(skb, &prog->exts) < 0)
		goto nla_put_failure;

	if (prog->exts_integrated)
		bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
	if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
		goto nla_put_failure;
	if (prog->gen_flags &&
	    nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct cls_bpf_head *head = rtnl_dereference(tp->root);
	struct cls_bpf_prog *prog;

	list_for_each_entry(prog, &head->plist, link) {
		if (arg->count < arg->skip)
			goto skip;
		if (arg->fn(tp, (unsigned long) prog, arg) < 0) {
			arg->stop = 1;
			break;
		}
skip:
		arg->count++;
	}
}

static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
	.kind		=	"bpf",
	.owner		=	THIS_MODULE,
	.classify	=	cls_bpf_classify,
	.init		=	cls_bpf_init,
	.destroy	=	cls_bpf_destroy,
	.get		=	cls_bpf_get,
	.change		=	cls_bpf_change,
	.delete		=	cls_bpf_delete,
	.walk		=	cls_bpf_walk,
	.dump		=	cls_bpf_dump,
};

static int __init cls_bpf_init_mod(void)
{
	return register_tcf_proto_ops(&cls_bpf_ops);
}

static void __exit cls_bpf_exit_mod(void)
{
	unregister_tcf_proto_ops(&cls_bpf_ops);
}

module_init(cls_bpf_init_mod);
module_exit(cls_bpf_exit_mod);
Commit	Line	Data
7d1d65cb DB	1	/*
	2	* Berkeley Packet Filter based traffic classifier
	3	*
	4	* Might be used to classify traffic through flexible, user-defined and
	5	* possibly JIT-ed BPF filters for traffic control as an alternative to
	6	* ematches.
	7	*
	8	* (C) 2013 Daniel Borkmann <dborkman@redhat.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/types.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/filter.h>
e2e9b654 DB	19	#include <linux/bpf.h>
e2e9b654 DB	20
7d1d65cb DB	21	#include <net/rtnetlink.h>
	22	#include <net/pkt_cls.h>
	23	#include <net/sock.h>
	24
	25	MODULE_LICENSE("GPL");
	26	MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
	27	MODULE_DESCRIPTION("TC BPF based classifier");
	28
e2e9b654	29	#define CLS_BPF_NAME_LEN 256
0d01d45f	30	#define CLS_BPF_SUPPORTED_GEN_FLAGS \
eadb4148	31	(TCA_CLS_FLAGS_SKIP_HW \| TCA_CLS_FLAGS_SKIP_SW)
e2e9b654	32
7d1d65cb DB	33	struct cls_bpf_head {
	34	struct list_head plist;
	35	u32 hgen;
1f947bf1	36	struct rcu_head rcu;
7d1d65cb DB	37	};
	38
	39	struct cls_bpf_prog {
7ae457c1	40	struct bpf_prog *filter;
7d1d65cb	41	struct list_head link;
e2e9b654	42	struct tcf_result res;
045efa82	43	bool exts_integrated;
332ae8e2	44	bool offloaded;
0d01d45f	45	u32 gen_flags;
e2e9b654	46	struct tcf_exts exts;
7d1d65cb	47	u32 handle;
e2e9b654 DB	48	union {
	49	u32 bpf_fd;
	50	u16 bpf_num_ops;
	51	};
	52	struct sock_filter *bpf_ops;
	53	const char *bpf_name;
1f947bf1 JF	54	struct tcf_proto *tp;
1f947bf1 JF	55	struct rcu_head rcu;
7d1d65cb DB	56	};
	57
	58	static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
	59	[TCA_BPF_CLASSID] = { .type = NLA_U32 },
045efa82	60	[TCA_BPF_FLAGS] = { .type = NLA_U32 },
0d01d45f	61	[TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 },
e2e9b654	62	[TCA_BPF_FD] = { .type = NLA_U32 },
5a7a5555 JHS	63	[TCA_BPF_NAME] = { .type = NLA_NUL_STRING,
5a7a5555 JHS	64	.len = CLS_BPF_NAME_LEN },
7d1d65cb DB	65	[TCA_BPF_OPS_LEN] = { .type = NLA_U16 },
	66	[TCA_BPF_OPS] = { .type = NLA_BINARY,
	67	.len = sizeof(struct sock_filter) * BPF_MAXINSNS },
	68	};
	69
045efa82 DB	70	static int cls_bpf_exec_opcode(int code)
	71	{
	72	switch (code) {
	73	case TC_ACT_OK:
045efa82	74	case TC_ACT_SHOT:
045efa82	75	case TC_ACT_STOLEN:
27b29f63	76	case TC_ACT_REDIRECT:
045efa82 DB	77	case TC_ACT_UNSPEC:
	78	return code;
	79	default:
	80	return TC_ACT_UNSPEC;
	81	}
	82	}
	83
7d1d65cb DB	84	static int cls_bpf_classify(struct sk_buff skb, const struct tcf_proto tp,
	85	struct tcf_result *res)
	86	{
80dcbd12	87	struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
fdc5432a	88	bool at_ingress = skb_at_tc_ingress(skb);
7d1d65cb	89	struct cls_bpf_prog *prog;
54720df1	90	int ret = -1;
7d1d65cb	91
54720df1 DB	92	/* Needed here for accessing maps. */
54720df1 DB	93	rcu_read_lock();
1f947bf1	94	list_for_each_entry_rcu(prog, &head->plist, link) {
3431205e AS	95	int filter_res;
3431205e AS	96
045efa82 DB	97	qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
045efa82 DB	98
eadb4148 JK	99	if (tc_skip_sw(prog->gen_flags)) {
	100	filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
	101	} else if (at_ingress) {
3431205e AS	102	/* It is safe to push/pull even if skb_shared() */
3431205e AS	103	__skb_push(skb, skb->mac_len);
db58ba45	104	bpf_compute_data_end(skb);
3431205e AS	105	filter_res = BPF_PROG_RUN(prog->filter, skb);
	106	__skb_pull(skb, skb->mac_len);
	107	} else {
db58ba45	108	bpf_compute_data_end(skb);
3431205e AS	109	filter_res = BPF_PROG_RUN(prog->filter, skb);
3431205e AS	110	}
7d1d65cb	111
045efa82	112	if (prog->exts_integrated) {
3a461da1 DB	113	res->class = 0;
	114	res->classid = TC_H_MAJ(prog->res.classid) \|
	115	qdisc_skb_cb(skb)->tc_classid;
045efa82 DB	116
	117	ret = cls_bpf_exec_opcode(filter_res);
	118	if (ret == TC_ACT_UNSPEC)
	119	continue;
	120	break;
	121	}
	122
7d1d65cb DB	123	if (filter_res == 0)
7d1d65cb DB	124	continue;
3a461da1 DB	125	if (filter_res != -1) {
3a461da1 DB	126	res->class = 0;
7d1d65cb	127	res->classid = filter_res;
3a461da1 DB	128	} else {
	129	*res = prog->res;
	130	}
7d1d65cb DB	131
	132	ret = tcf_exts_exec(skb, &prog->exts, res);
	133	if (ret < 0)
	134	continue;
	135
54720df1	136	break;
7d1d65cb	137	}
54720df1	138	rcu_read_unlock();
7d1d65cb	139
54720df1	140	return ret;
7d1d65cb DB	141	}
7d1d65cb DB	142
e2e9b654 DB	143	static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
	144	{
	145	return !prog->bpf_ops;
	146	}
	147
332ae8e2 JK	148	static int cls_bpf_offload_cmd(struct tcf_proto tp, struct cls_bpf_prog prog,
	149	enum tc_clsbpf_command cmd)
	150	{
	151	struct net_device *dev = tp->q->dev_queue->dev;
	152	struct tc_cls_bpf_offload bpf_offload = {};
	153	struct tc_to_netdev offload;
	154
	155	offload.type = TC_SETUP_CLSBPF;
	156	offload.cls_bpf = &bpf_offload;
	157
	158	bpf_offload.command = cmd;
	159	bpf_offload.exts = &prog->exts;
	160	bpf_offload.prog = prog->filter;
	161	bpf_offload.name = prog->bpf_name;
	162	bpf_offload.exts_integrated = prog->exts_integrated;
0d01d45f	163	bpf_offload.gen_flags = prog->gen_flags;
332ae8e2 JK	164
	165	return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
	166	tp->protocol, &offload);
	167	}
	168
eadb4148 JK	169	static int cls_bpf_offload(struct tcf_proto tp, struct cls_bpf_prog prog,
eadb4148 JK	170	struct cls_bpf_prog *oldprog)
332ae8e2 JK	171	{
	172	struct net_device *dev = tp->q->dev_queue->dev;
	173	struct cls_bpf_prog *obj = prog;
	174	enum tc_clsbpf_command cmd;
eadb4148 JK	175	bool skip_sw;
	176	int ret;
	177
	178	skip_sw = tc_skip_sw(prog->gen_flags) \|\|
	179	(oldprog && tc_skip_sw(oldprog->gen_flags));
332ae8e2 JK	180
332ae8e2 JK	181	if (oldprog && oldprog->offloaded) {
0d01d45f	182	if (tc_should_offload(dev, tp, prog->gen_flags)) {
332ae8e2	183	cmd = TC_CLSBPF_REPLACE;
eadb4148	184	} else if (!tc_skip_sw(prog->gen_flags)) {
332ae8e2 JK	185	obj = oldprog;
332ae8e2 JK	186	cmd = TC_CLSBPF_DESTROY;
eadb4148 JK	187	} else {
eadb4148 JK	188	return -EINVAL;
332ae8e2 JK	189	}
332ae8e2 JK	190	} else {
0d01d45f	191	if (!tc_should_offload(dev, tp, prog->gen_flags))
eadb4148	192	return skip_sw ? -EINVAL : 0;
332ae8e2 JK	193	cmd = TC_CLSBPF_ADD;
	194	}
	195
eadb4148 JK	196	ret = cls_bpf_offload_cmd(tp, obj, cmd);
	197	if (ret)
	198	return skip_sw ? ret : 0;
332ae8e2 JK	199
	200	obj->offloaded = true;
	201	if (oldprog)
	202	oldprog->offloaded = false;
eadb4148 JK	203
eadb4148 JK	204	return 0;
332ae8e2 JK	205	}
	206
	207	static void cls_bpf_stop_offload(struct tcf_proto *tp,
	208	struct cls_bpf_prog *prog)
	209	{
	210	int err;
	211
	212	if (!prog->offloaded)
	213	return;
	214
	215	err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
	216	if (err) {
	217	pr_err("Stopping hardware offload failed: %d\n", err);
	218	return;
	219	}
	220
	221	prog->offloaded = false;
	222	}
	223
68d64063 JK	224	static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
	225	struct cls_bpf_prog *prog)
	226	{
	227	if (!prog->offloaded)
	228	return;
	229
	230	cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS);
	231	}
	232
7d1d65cb DB	233	static int cls_bpf_init(struct tcf_proto *tp)
	234	{
	235	struct cls_bpf_head *head;
	236
	237	head = kzalloc(sizeof(*head), GFP_KERNEL);
	238	if (head == NULL)
	239	return -ENOBUFS;
	240
1f947bf1 JF	241	INIT_LIST_HEAD_RCU(&head->plist);
1f947bf1 JF	242	rcu_assign_pointer(tp->root, head);
7d1d65cb DB	243
	244	return 0;
	245	}
	246
	247	static void cls_bpf_delete_prog(struct tcf_proto tp, struct cls_bpf_prog prog)
	248	{
18d0264f	249	tcf_exts_destroy(&prog->exts);
7d1d65cb	250
e2e9b654 DB	251	if (cls_bpf_is_ebpf(prog))
	252	bpf_prog_put(prog->filter);
	253	else
	254	bpf_prog_destroy(prog->filter);
7d1d65cb	255
e2e9b654	256	kfree(prog->bpf_name);
7d1d65cb DB	257	kfree(prog->bpf_ops);
	258	kfree(prog);
	259	}
	260
1f947bf1 JF	261	static void __cls_bpf_delete_prog(struct rcu_head *rcu)
	262	{
	263	struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
	264
	265	cls_bpf_delete_prog(prog->tp, prog);
	266	}
	267
7d1d65cb DB	268	static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
7d1d65cb DB	269	{
472f5837	270	struct cls_bpf_prog prog = (struct cls_bpf_prog ) arg;
7d1d65cb	271
332ae8e2	272	cls_bpf_stop_offload(tp, prog);
472f5837 JP	273	list_del_rcu(&prog->link);
	274	tcf_unbind_filter(tp, &prog->res);
	275	call_rcu(&prog->rcu, __cls_bpf_delete_prog);
e2e9b654	276
472f5837	277	return 0;
7d1d65cb DB	278	}
7d1d65cb DB	279
1e052be6	280	static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
7d1d65cb	281	{
1f947bf1	282	struct cls_bpf_head *head = rtnl_dereference(tp->root);
7d1d65cb DB	283	struct cls_bpf_prog prog, tmp;
7d1d65cb DB	284
1e052be6 CW	285	if (!force && !list_empty(&head->plist))
	286	return false;
	287
7d1d65cb	288	list_for_each_entry_safe(prog, tmp, &head->plist, link) {
332ae8e2	289	cls_bpf_stop_offload(tp, prog);
1f947bf1	290	list_del_rcu(&prog->link);
18cdb37e	291	tcf_unbind_filter(tp, &prog->res);
1f947bf1	292	call_rcu(&prog->rcu, __cls_bpf_delete_prog);
7d1d65cb DB	293	}
7d1d65cb DB	294
1f947bf1 JF	295	RCU_INIT_POINTER(tp->root, NULL);
1f947bf1 JF	296	kfree_rcu(head, rcu);
1e052be6	297	return true;
7d1d65cb DB	298	}
	299
	300	static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
	301	{
1f947bf1	302	struct cls_bpf_head *head = rtnl_dereference(tp->root);
7d1d65cb DB	303	struct cls_bpf_prog *prog;
	304	unsigned long ret = 0UL;
	305
	306	if (head == NULL)
	307	return 0UL;
	308
3fe6b49e	309	list_for_each_entry(prog, &head->plist, link) {
7d1d65cb DB	310	if (prog->handle == handle) {
	311	ret = (unsigned long) prog;
	312	break;
	313	}
	314	}
	315
	316	return ret;
	317	}
	318
045efa82	319	static int cls_bpf_prog_from_ops(struct nlattr *tb, struct cls_bpf_prog prog)
7d1d65cb	320	{
1f947bf1	321	struct sock_filter *bpf_ops;
e2e9b654	322	struct sock_fprog_kern fprog_tmp;
1f947bf1	323	struct bpf_prog *fp;
33e9fcc6	324	u16 bpf_size, bpf_num_ops;
7d1d65cb DB	325	int ret;
7d1d65cb DB	326
33e9fcc6	327	bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
e2e9b654 DB	328	if (bpf_num_ops > BPF_MAXINSNS \|\| bpf_num_ops == 0)
e2e9b654 DB	329	return -EINVAL;
7d1d65cb	330
33e9fcc6	331	bpf_size = bpf_num_ops * sizeof(*bpf_ops);
e2e9b654 DB	332	if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
e2e9b654 DB	333	return -EINVAL;
7913ecf6	334
7d1d65cb	335	bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
e2e9b654 DB	336	if (bpf_ops == NULL)
e2e9b654 DB	337	return -ENOMEM;
7d1d65cb DB	338
	339	memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
	340
e2e9b654 DB	341	fprog_tmp.len = bpf_num_ops;
e2e9b654 DB	342	fprog_tmp.filter = bpf_ops;
7d1d65cb	343
e2e9b654 DB	344	ret = bpf_prog_create(&fp, &fprog_tmp);
	345	if (ret < 0) {
	346	kfree(bpf_ops);
	347	return ret;
	348	}
7d1d65cb	349
7d1d65cb	350	prog->bpf_ops = bpf_ops;
e2e9b654 DB	351	prog->bpf_num_ops = bpf_num_ops;
e2e9b654 DB	352	prog->bpf_name = NULL;
7d1d65cb	353	prog->filter = fp;
7d1d65cb	354
e2e9b654 DB	355	return 0;
	356	}
	357
c46646d0 DB	358	static int cls_bpf_prog_from_efd(struct nlattr *tb, struct cls_bpf_prog prog,
c46646d0 DB	359	const struct tcf_proto *tp)
e2e9b654 DB	360	{
	361	struct bpf_prog *fp;
	362	char *name = NULL;
	363	u32 bpf_fd;
	364
	365	bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
	366
113214be	367	fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS);
e2e9b654 DB	368	if (IS_ERR(fp))
	369	return PTR_ERR(fp);
	370
e2e9b654 DB	371	if (tb[TCA_BPF_NAME]) {
	372	name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
	373	nla_len(tb[TCA_BPF_NAME]),
	374	GFP_KERNEL);
	375	if (!name) {
	376	bpf_prog_put(fp);
	377	return -ENOMEM;
	378	}
	379	}
	380
	381	prog->bpf_ops = NULL;
	382	prog->bpf_fd = bpf_fd;
	383	prog->bpf_name = name;
e2e9b654	384	prog->filter = fp;
e2e9b654	385
1f211a1b	386	if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
c46646d0 DB	387	netif_keep_dst(qdisc_dev(tp->q));
c46646d0 DB	388
e2e9b654 DB	389	return 0;
	390	}
	391
	392	static int cls_bpf_modify_existing(struct net net, struct tcf_proto tp,
	393	struct cls_bpf_prog *prog,
	394	unsigned long base, struct nlattr **tb,
	395	struct nlattr *est, bool ovr)
	396	{
045efa82	397	bool is_bpf, is_ebpf, have_exts = false;
e2e9b654	398	struct tcf_exts exts;
0d01d45f	399	u32 gen_flags = 0;
e2e9b654 DB	400	int ret;
	401
	402	is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
	403	is_ebpf = tb[TCA_BPF_FD];
ef146fa4	404	if ((!is_bpf && !is_ebpf) \|\| (is_bpf && is_ebpf))
e2e9b654 DB	405	return -EINVAL;
e2e9b654 DB	406
b9a24bb7	407	ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);
e2e9b654 DB	408	if (ret < 0)
e2e9b654 DB	409	return ret;
b9a24bb7 WC	410	ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);
	411	if (ret < 0)
	412	goto errout;
e2e9b654	413
045efa82 DB	414	if (tb[TCA_BPF_FLAGS]) {
	415	u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
	416
	417	if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
b9a24bb7 WC	418	ret = -EINVAL;
b9a24bb7 WC	419	goto errout;
045efa82 DB	420	}
	421
	422	have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
	423	}
0d01d45f JK	424	if (tb[TCA_BPF_FLAGS_GEN]) {
	425	gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
	426	if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS \|\|
	427	!tc_flags_valid(gen_flags)) {
	428	ret = -EINVAL;
	429	goto errout;
	430	}
	431	}
045efa82	432
045efa82	433	prog->exts_integrated = have_exts;
0d01d45f	434	prog->gen_flags = gen_flags;
e2e9b654	435
045efa82	436	ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
c46646d0	437	cls_bpf_prog_from_efd(tb, prog, tp);
b9a24bb7 WC	438	if (ret < 0)
b9a24bb7 WC	439	goto errout;
e2e9b654	440
ef146fa4 DB	441	if (tb[TCA_BPF_CLASSID]) {
	442	prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
	443	tcf_bind_filter(tp, &prog->res, base);
	444	}
7d1d65cb	445
ef146fa4	446	tcf_exts_change(tp, &prog->exts, &exts);
7d1d65cb	447	return 0;
b9a24bb7 WC	448
	449	errout:
	450	tcf_exts_destroy(&exts);
	451	return ret;
7d1d65cb DB	452	}
	453
	454	static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
	455	struct cls_bpf_head *head)
	456	{
	457	unsigned int i = 0x80000000;
3f2ab135	458	u32 handle;
7d1d65cb DB	459
	460	do {
	461	if (++head->hgen == 0x7FFFFFFF)
	462	head->hgen = 1;
	463	} while (--i > 0 && cls_bpf_get(tp, head->hgen));
3f2ab135 DB	464
3f2ab135 DB	465	if (unlikely(i == 0)) {
7d1d65cb	466	pr_err("Insufficient number of handles\n");
3f2ab135 DB	467	handle = 0;
	468	} else {
	469	handle = head->hgen;
	470	}
7d1d65cb	471
3f2ab135	472	return handle;
7d1d65cb DB	473	}
	474
	475	static int cls_bpf_change(struct net net, struct sk_buff in_skb,
	476	struct tcf_proto *tp, unsigned long base,
	477	u32 handle, struct nlattr **tca,
2f7ef2f8	478	unsigned long *arg, bool ovr)
7d1d65cb	479	{
1f947bf1 JF	480	struct cls_bpf_head *head = rtnl_dereference(tp->root);
1f947bf1 JF	481	struct cls_bpf_prog oldprog = (struct cls_bpf_prog ) *arg;
7d1d65cb	482	struct nlattr *tb[TCA_BPF_MAX + 1];
1f947bf1	483	struct cls_bpf_prog *prog;
7d1d65cb DB	484	int ret;
	485
	486	if (tca[TCA_OPTIONS] == NULL)
	487	return -EINVAL;
	488
	489	ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
	490	if (ret < 0)
	491	return ret;
	492
7d1d65cb	493	prog = kzalloc(sizeof(*prog), GFP_KERNEL);
1f947bf1	494	if (!prog)
7d1d65cb DB	495	return -ENOBUFS;
7d1d65cb DB	496
b9a24bb7 WC	497	ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
	498	if (ret < 0)
	499	goto errout;
1f947bf1 JF	500
	501	if (oldprog) {
	502	if (handle && oldprog->handle != handle) {
	503	ret = -EINVAL;
	504	goto errout;
	505	}
	506	}
	507
7d1d65cb DB	508	if (handle == 0)
	509	prog->handle = cls_bpf_grab_new_handle(tp, head);
	510	else
	511	prog->handle = handle;
	512	if (prog->handle == 0) {
	513	ret = -EINVAL;
	514	goto errout;
	515	}
	516
5a7a5555 JHS	517	ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE],
5a7a5555 JHS	518	ovr);
7d1d65cb DB	519	if (ret < 0)
	520	goto errout;
	521
eadb4148 JK	522	ret = cls_bpf_offload(tp, prog, oldprog);
	523	if (ret) {
	524	cls_bpf_delete_prog(tp, prog);
	525	return ret;
	526	}
332ae8e2	527
1f947bf1	528	if (oldprog) {
f6bfc46d	529	list_replace_rcu(&oldprog->link, &prog->link);
18cdb37e	530	tcf_unbind_filter(tp, &oldprog->res);
1f947bf1 JF	531	call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
	532	} else {
	533	list_add_rcu(&prog->link, &head->plist);
	534	}
7d1d65cb DB	535
7d1d65cb DB	536	*arg = (unsigned long) prog;
7d1d65cb	537	return 0;
b9a24bb7	538
7d1d65cb	539	errout:
b9a24bb7	540	tcf_exts_destroy(&prog->exts);
1f947bf1	541	kfree(prog);
7d1d65cb DB	542	return ret;
	543	}
	544
e2e9b654 DB	545	static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
	546	struct sk_buff *skb)
	547	{
	548	struct nlattr *nla;
	549
	550	if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
	551	return -EMSGSIZE;
	552
	553	nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
	554	sizeof(struct sock_filter));
	555	if (nla == NULL)
	556	return -EMSGSIZE;
	557
	558	memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
	559
	560	return 0;
	561	}
	562
	563	static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
	564	struct sk_buff *skb)
	565	{
	566	if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd))
	567	return -EMSGSIZE;
	568
	569	if (prog->bpf_name &&
	570	nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
	571	return -EMSGSIZE;
	572
	573	return 0;
	574	}
	575
832d1d5b	576	static int cls_bpf_dump(struct net net, struct tcf_proto tp, unsigned long fh,
7d1d65cb DB	577	struct sk_buff skb, struct tcmsg tm)
	578	{
	579	struct cls_bpf_prog prog = (struct cls_bpf_prog ) fh;
e2e9b654	580	struct nlattr *nest;
bf007d1c	581	u32 bpf_flags = 0;
e2e9b654	582	int ret;
7d1d65cb DB	583
	584	if (prog == NULL)
	585	return skb->len;
	586
	587	tm->tcm_handle = prog->handle;
	588
68d64063 JK	589	cls_bpf_offload_update_stats(tp, prog);
68d64063 JK	590
7d1d65cb DB	591	nest = nla_nest_start(skb, TCA_OPTIONS);
	592	if (nest == NULL)
	593	goto nla_put_failure;
	594
ef146fa4 DB	595	if (prog->res.classid &&
ef146fa4 DB	596	nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
7d1d65cb	597	goto nla_put_failure;
7d1d65cb	598
e2e9b654 DB	599	if (cls_bpf_is_ebpf(prog))
	600	ret = cls_bpf_dump_ebpf_info(prog, skb);
	601	else
	602	ret = cls_bpf_dump_bpf_info(prog, skb);
	603	if (ret)
7d1d65cb DB	604	goto nla_put_failure;
7d1d65cb DB	605
5da57f42	606	if (tcf_exts_dump(skb, &prog->exts) < 0)
7d1d65cb DB	607	goto nla_put_failure;
7d1d65cb DB	608
bf007d1c DB	609	if (prog->exts_integrated)
	610	bpf_flags \|= TCA_BPF_FLAG_ACT_DIRECT;
	611	if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
	612	goto nla_put_failure;
0d01d45f JK	613	if (prog->gen_flags &&
	614	nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
	615	goto nla_put_failure;
bf007d1c	616
7d1d65cb DB	617	nla_nest_end(skb, nest);
7d1d65cb DB	618
5da57f42	619	if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
7d1d65cb DB	620	goto nla_put_failure;
	621
	622	return skb->len;
	623
	624	nla_put_failure:
	625	nla_nest_cancel(skb, nest);
	626	return -1;
	627	}
	628
	629	static void cls_bpf_walk(struct tcf_proto tp, struct tcf_walker arg)
	630	{
1f947bf1	631	struct cls_bpf_head *head = rtnl_dereference(tp->root);
7d1d65cb DB	632	struct cls_bpf_prog *prog;
7d1d65cb DB	633
3fe6b49e	634	list_for_each_entry(prog, &head->plist, link) {
7d1d65cb DB	635	if (arg->count < arg->skip)
	636	goto skip;
	637	if (arg->fn(tp, (unsigned long) prog, arg) < 0) {
	638	arg->stop = 1;
	639	break;
	640	}
	641	skip:
	642	arg->count++;
	643	}
	644	}
	645
	646	static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
	647	.kind = "bpf",
	648	.owner = THIS_MODULE,
	649	.classify = cls_bpf_classify,
	650	.init = cls_bpf_init,
	651	.destroy = cls_bpf_destroy,
	652	.get = cls_bpf_get,
7d1d65cb DB	653	.change = cls_bpf_change,
	654	.delete = cls_bpf_delete,
	655	.walk = cls_bpf_walk,
	656	.dump = cls_bpf_dump,
	657	};
	658
	659	static int __init cls_bpf_init_mod(void)
	660	{
	661	return register_tcf_proto_ops(&cls_bpf_ops);
	662	}
	663
	664	static void __exit cls_bpf_exit_mod(void)
	665	{
	666	unregister_tcf_proto_ops(&cls_bpf_ops);
	667	}
	668
	669	module_init(cls_bpf_init_mod);
	670	module_exit(cls_bpf_exit_mod);