/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * 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.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/seqlock.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>

struct nft_counter {
	s64		bytes;
	s64		packets;
};

struct nft_counter_percpu_priv {
	struct nft_counter __percpu *counter;
};

static DEFINE_PER_CPU(seqcount_t, nft_counter_seq);

static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
				       struct nft_regs *regs,
				       const struct nft_pktinfo *pkt)
{
	struct nft_counter *this_cpu;
	seqcount_t *myseq;

	local_bh_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	myseq = this_cpu_ptr(&nft_counter_seq);

	write_seqcount_begin(myseq);

	this_cpu->bytes += pkt->skb->len;
	this_cpu->packets++;

	write_seqcount_end(myseq);
	local_bh_enable();
}

static inline void nft_counter_obj_eval(struct nft_object *obj,
					struct nft_regs *regs,
					const struct nft_pktinfo *pkt)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	nft_counter_do_eval(priv, regs, pkt);
}

static int nft_counter_do_init(const struct nlattr * const tb[],
			       struct nft_counter_percpu_priv *priv)
{
	struct nft_counter __percpu *cpu_stats;
	struct nft_counter *this_cpu;

	cpu_stats = alloc_percpu(struct nft_counter);
	if (cpu_stats == NULL)
		return -ENOMEM;

	preempt_disable();
	this_cpu = this_cpu_ptr(cpu_stats);
	if (tb[NFTA_COUNTER_PACKETS]) {
	        this_cpu->packets =
			be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	}
	if (tb[NFTA_COUNTER_BYTES]) {
		this_cpu->bytes =
			be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	}
	preempt_enable();
	priv->counter = cpu_stats;
	return 0;
}

static int nft_counter_obj_init(const struct nlattr * const tb[],
				struct nft_object *obj)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	return nft_counter_do_init(tb, priv);
}

static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
{
	free_percpu(priv->counter);
}

static void nft_counter_obj_destroy(struct nft_object *obj)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	nft_counter_do_destroy(priv);
}

static void nft_counter_reset(struct nft_counter_percpu_priv __percpu *priv,
			      struct nft_counter *total)
{
	struct nft_counter *this_cpu;

	local_bh_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	this_cpu->packets -= total->packets;
	this_cpu->bytes -= total->bytes;
	local_bh_enable();
}

static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
			      struct nft_counter *total)
{
	struct nft_counter *this_cpu;
	const seqcount_t *myseq;
	u64 bytes, packets;
	unsigned int seq;
	int cpu;

	memset(total, 0, sizeof(*total));
	for_each_possible_cpu(cpu) {
		myseq = per_cpu_ptr(&nft_counter_seq, cpu);
		this_cpu = per_cpu_ptr(priv->counter, cpu);
		do {
			seq	= read_seqcount_begin(myseq);
			bytes	= this_cpu->bytes;
			packets	= this_cpu->packets;
		} while (read_seqcount_retry(myseq, seq));

		total->bytes	+= bytes;
		total->packets	+= packets;
	}
}

static int nft_counter_do_dump(struct sk_buff *skb,
			       struct nft_counter_percpu_priv *priv,
			       bool reset)
{
	struct nft_counter total;

	nft_counter_fetch(priv, &total);

	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
			 NFTA_COUNTER_PAD) ||
	    nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
			 NFTA_COUNTER_PAD))
		goto nla_put_failure;

	if (reset)
		nft_counter_reset(priv, &total);

	return 0;

nla_put_failure:
	return -1;
}

static int nft_counter_obj_dump(struct sk_buff *skb,
				struct nft_object *obj, bool reset)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	return nft_counter_do_dump(skb, priv, reset);
}

static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
	[NFTA_COUNTER_PACKETS]	= { .type = NLA_U64 },
	[NFTA_COUNTER_BYTES]	= { .type = NLA_U64 },
};

static struct nft_object_type nft_counter_obj __read_mostly = {
	.type		= NFT_OBJECT_COUNTER,
	.size		= sizeof(struct nft_counter_percpu_priv),
	.maxattr	= NFTA_COUNTER_MAX,
	.policy		= nft_counter_policy,
	.eval		= nft_counter_obj_eval,
	.init		= nft_counter_obj_init,
	.destroy	= nft_counter_obj_destroy,
	.dump		= nft_counter_obj_dump,
	.owner		= THIS_MODULE,
};

static void nft_counter_eval(const struct nft_expr *expr,
			     struct nft_regs *regs,
			     const struct nft_pktinfo *pkt)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	nft_counter_do_eval(priv, regs, pkt);
}

static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	return nft_counter_do_dump(skb, priv, false);
}

static int nft_counter_init(const struct nft_ctx *ctx,
			    const struct nft_expr *expr,
			    const struct nlattr * const tb[])
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	return nft_counter_do_init(tb, priv);
}

static void nft_counter_destroy(const struct nft_ctx *ctx,
				const struct nft_expr *expr)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	nft_counter_do_destroy(priv);
}

static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
	struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
	struct nft_counter __percpu *cpu_stats;
	struct nft_counter *this_cpu;
	struct nft_counter total;

	nft_counter_fetch(priv, &total);

	cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
	if (cpu_stats == NULL)
		return -ENOMEM;

	preempt_disable();
	this_cpu = this_cpu_ptr(cpu_stats);
	this_cpu->packets = total.packets;
	this_cpu->bytes = total.bytes;
	preempt_enable();

	priv_clone->counter = cpu_stats;
	return 0;
}

static struct nft_expr_type nft_counter_type;
static const struct nft_expr_ops nft_counter_ops = {
	.type		= &nft_counter_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
	.eval		= nft_counter_eval,
	.init		= nft_counter_init,
	.destroy	= nft_counter_destroy,
	.dump		= nft_counter_dump,
	.clone		= nft_counter_clone,
};

static struct nft_expr_type nft_counter_type __read_mostly = {
	.name		= "counter",
	.ops		= &nft_counter_ops,
	.policy		= nft_counter_policy,
	.maxattr	= NFTA_COUNTER_MAX,
	.flags		= NFT_EXPR_STATEFUL,
	.owner		= THIS_MODULE,
};

static int __init nft_counter_module_init(void)
{
	int cpu, err;

	for_each_possible_cpu(cpu)
		seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));

	err = nft_register_obj(&nft_counter_obj);
	if (err < 0)
		return err;

	err = nft_register_expr(&nft_counter_type);
	if (err < 0)
		goto err1;

	return 0;
err1:
	nft_unregister_obj(&nft_counter_obj);
	return err;
}

static void __exit nft_counter_module_exit(void)
{
	nft_unregister_expr(&nft_counter_type);
	nft_unregister_obj(&nft_counter_obj);
}

module_init(nft_counter_module_init);
module_exit(nft_counter_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("counter");
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
 tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'net/decnet/TODO')</div><table summary='diffstat' class='diffstat'>