[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_flow_table_core.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/rhashtable.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/ip6_route.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_tuple.h>

static DEFINE_MUTEX(flowtable_lock);
static LIST_HEAD(flowtables);

static void
flow_offload_fill_dir(struct flow_offload *flow,
		      enum flow_offload_tuple_dir dir)
{
	struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple;
	struct nf_conntrack_tuple *ctt = &flow->ct->tuplehash[dir].tuple;

	ft->dir = dir;

	switch (ctt->src.l3num) {
	case NFPROTO_IPV4:
		ft->src_v4 = ctt->src.u3.in;
		ft->dst_v4 = ctt->dst.u3.in;
		break;
	case NFPROTO_IPV6:
		ft->src_v6 = ctt->src.u3.in6;
		ft->dst_v6 = ctt->dst.u3.in6;
		break;
	}

	ft->l3proto = ctt->src.l3num;
	ft->l4proto = ctt->dst.protonum;
	ft->src_port = ctt->src.u.tcp.port;
	ft->dst_port = ctt->dst.u.tcp.port;
}

struct flow_offload *flow_offload_alloc(struct nf_conn *ct)
{
	struct flow_offload *flow;

	if (unlikely(nf_ct_is_dying(ct) ||
	    !atomic_inc_not_zero(&ct->ct_general.use)))
		return NULL;

	flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
	if (!flow)
		goto err_ct_refcnt;

	flow->ct = ct;

	flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
	flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_REPLY);

	if (ct->status & IPS_SRC_NAT)
		__set_bit(NF_FLOW_SNAT, &flow->flags);
	if (ct->status & IPS_DST_NAT)
		__set_bit(NF_FLOW_DNAT, &flow->flags);

	return flow;

err_ct_refcnt:
	nf_ct_put(ct);

	return NULL;
}
EXPORT_SYMBOL_GPL(flow_offload_alloc);

static int flow_offload_fill_route(struct flow_offload *flow,
				   const struct nf_flow_route *route,
				   enum flow_offload_tuple_dir dir)
{
	struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
	struct dst_entry *dst = route->tuple[dir].dst;
	int i, j = 0;

	switch (flow_tuple->l3proto) {
	case NFPROTO_IPV4:
		flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true);
		break;
	case NFPROTO_IPV6:
		flow_tuple->mtu = ip6_dst_mtu_forward(dst);
		break;
	}

	flow_tuple->iifidx = route->tuple[dir].in.ifindex;
	for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) {
		flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id;
		flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto;
		j++;
	}
	flow_tuple->encap_num = route->tuple[dir].in.num_encaps;

	switch (route->tuple[dir].xmit_type) {
	case FLOW_OFFLOAD_XMIT_DIRECT:
		memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest,
		       ETH_ALEN);
		memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source,
		       ETH_ALEN);
		flow_tuple->out.ifidx = route->tuple[dir].out.ifindex;
		break;
	case FLOW_OFFLOAD_XMIT_XFRM:
	case FLOW_OFFLOAD_XMIT_NEIGH:
		if (!dst_hold_safe(route->tuple[dir].dst))
			return -1;

		flow_tuple->dst_cache = dst;
		break;
	}
	flow_tuple->xmit_type = route->tuple[dir].xmit_type;

	return 0;
}

static void nft_flow_dst_release(struct flow_offload *flow,
				 enum flow_offload_tuple_dir dir)
{
	if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH ||
	    flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)
		dst_release(flow->tuplehash[dir].tuple.dst_cache);
}

int flow_offload_route_init(struct flow_offload *flow,
			    const struct nf_flow_route *route)
{
	int err;

	err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL);
	if (err < 0)
		return err;

	err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY);
	if (err < 0)
		goto err_route_reply;

	flow->type = NF_FLOW_OFFLOAD_ROUTE;

	return 0;

err_route_reply:
	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);

	return err;
}
EXPORT_SYMBOL_GPL(flow_offload_route_init);

static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
{
	tcp->state = TCP_CONNTRACK_ESTABLISHED;
	tcp->seen[0].td_maxwin = 0;
	tcp->seen[1].td_maxwin = 0;
}

#define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT	(120 * HZ)
#define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT	(30 * HZ)

static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
{
	const struct nf_conntrack_l4proto *l4proto;
	int l4num = nf_ct_protonum(ct);
	unsigned int timeout;

	l4proto = nf_ct_l4proto_find(l4num);
	if (!l4proto)
		return;

	if (l4num == IPPROTO_TCP)
		timeout = NF_FLOWTABLE_TCP_PICKUP_TIMEOUT;
	else if (l4num == IPPROTO_UDP)
		timeout = NF_FLOWTABLE_UDP_PICKUP_TIMEOUT;
	else
		return;

	if (nf_flow_timeout_delta(ct->timeout) > (__s32)timeout)
		ct->timeout = nfct_time_stamp + timeout;
}

static void flow_offload_fixup_ct_state(struct nf_conn *ct)
{
	if (nf_ct_protonum(ct) == IPPROTO_TCP)
		flow_offload_fixup_tcp(&ct->proto.tcp);
}

static void flow_offload_fixup_ct(struct nf_conn *ct)
{
	flow_offload_fixup_ct_state(ct);
	flow_offload_fixup_ct_timeout(ct);
}

static void flow_offload_route_release(struct flow_offload *flow)
{
	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_REPLY);
}

void flow_offload_free(struct flow_offload *flow)
{
	switch (flow->type) {
	case NF_FLOW_OFFLOAD_ROUTE:
		flow_offload_route_release(flow);
		break;
	default:
		break;
	}
	nf_ct_put(flow->ct);
	kfree_rcu(flow, rcu_head);
}
EXPORT_SYMBOL_GPL(flow_offload_free);

static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
{
	const struct flow_offload_tuple *tuple = data;

	return jhash(tuple, offsetof(struct flow_offload_tuple, __hash), seed);
}

static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed)
{
	const struct flow_offload_tuple_rhash *tuplehash = data;

	return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, __hash), seed);
}

static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg,
					const void *ptr)
{
	const struct flow_offload_tuple *tuple = arg->key;
	const struct flow_offload_tuple_rhash *x = ptr;

	if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, __hash)))
		return 1;

	return 0;
}

static const struct rhashtable_params nf_flow_offload_rhash_params = {
	.head_offset		= offsetof(struct flow_offload_tuple_rhash, node),
	.hashfn			= flow_offload_hash,
	.obj_hashfn		= flow_offload_hash_obj,
	.obj_cmpfn		= flow_offload_hash_cmp,
	.automatic_shrinking	= true,
};

int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
{
	int err;

	flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;

	err = rhashtable_insert_fast(&flow_table->rhashtable,
				     &flow->tuplehash[0].node,
				     nf_flow_offload_rhash_params);
	if (err < 0)
		return err;

	err = rhashtable_insert_fast(&flow_table->rhashtable,
				     &flow->tuplehash[1].node,
				     nf_flow_offload_rhash_params);
	if (err < 0) {
		rhashtable_remove_fast(&flow_table->rhashtable,
				       &flow->tuplehash[0].node,
				       nf_flow_offload_rhash_params);
		return err;
	}

	nf_ct_offload_timeout(flow->ct);

	if (nf_flowtable_hw_offload(flow_table)) {
		__set_bit(NF_FLOW_HW, &flow->flags);
		nf_flow_offload_add(flow_table, flow);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(flow_offload_add);

void flow_offload_refresh(struct nf_flowtable *flow_table,
			  struct flow_offload *flow)
{
	flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;

	if (likely(!nf_flowtable_hw_offload(flow_table) ||
		   !test_and_clear_bit(NF_FLOW_HW_REFRESH, &flow->flags)))
		return;

	nf_flow_offload_add(flow_table, flow);
}
EXPORT_SYMBOL_GPL(flow_offload_refresh);

static inline bool nf_flow_has_expired(const struct flow_offload *flow)
{
	return nf_flow_timeout_delta(flow->timeout) <= 0;
}

static void flow_offload_del(struct nf_flowtable *flow_table,
			     struct flow_offload *flow)
{
	rhashtable_remove_fast(&flow_table->rhashtable,
			       &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
			       nf_flow_offload_rhash_params);
	rhashtable_remove_fast(&flow_table->rhashtable,
			       &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
			       nf_flow_offload_rhash_params);

	clear_bit(IPS_OFFLOAD_BIT, &flow->ct->status);

	if (nf_flow_has_expired(flow))
		flow_offload_fixup_ct(flow->ct);
	else
		flow_offload_fixup_ct_timeout(flow->ct);

	flow_offload_free(flow);
}

void flow_offload_teardown(struct flow_offload *flow)
{
	set_bit(NF_FLOW_TEARDOWN, &flow->flags);

	flow_offload_fixup_ct_state(flow->ct);
}
EXPORT_SYMBOL_GPL(flow_offload_teardown);

struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable *flow_table,
		    struct flow_offload_tuple *tuple)
{
	struct flow_offload_tuple_rhash *tuplehash;
	struct flow_offload *flow;
	int dir;

	tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple,
				      nf_flow_offload_rhash_params);
	if (!tuplehash)
		return NULL;

	dir = tuplehash->tuple.dir;
	flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
	if (test_bit(NF_FLOW_TEARDOWN, &flow->flags))
		return NULL;

	if (unlikely(nf_ct_is_dying(flow->ct)))
		return NULL;

	return tuplehash;
}
EXPORT_SYMBOL_GPL(flow_offload_lookup);

static int
nf_flow_table_iterate(struct nf_flowtable *flow_table,
		      void (*iter)(struct flow_offload *flow, void *data),
		      void *data)
{
	struct flow_offload_tuple_rhash *tuplehash;
	struct rhashtable_iter hti;
	struct flow_offload *flow;
	int err = 0;

	rhashtable_walk_enter(&flow_table->rhashtable, &hti);
	rhashtable_walk_start(&hti);

	while ((tuplehash = rhashtable_walk_next(&hti))) {
		if (IS_ERR(tuplehash)) {
			if (PTR_ERR(tuplehash) != -EAGAIN) {
				err = PTR_ERR(tuplehash);
				break;
			}
			continue;
		}
		if (tuplehash->tuple.dir)
			continue;

		flow = container_of(tuplehash, struct flow_offload, tuplehash[0]);

		iter(flow, data);
	}
	rhashtable_walk_stop(&hti);
	rhashtable_walk_exit(&hti);

	return err;
}

static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data)
{
	struct nf_flowtable *flow_table = data;

	if (nf_flow_has_expired(flow) || nf_ct_is_dying(flow->ct))
		set_bit(NF_FLOW_TEARDOWN, &flow->flags);

	if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) {
		if (test_bit(NF_FLOW_HW, &flow->flags)) {
			if (!test_bit(NF_FLOW_HW_DYING, &flow->flags))
				nf_flow_offload_del(flow_table, flow);
			else if (test_bit(NF_FLOW_HW_DEAD, &flow->flags))
				flow_offload_del(flow_table, flow);
		} else {
			flow_offload_del(flow_table, flow);
		}
	} else if (test_bit(NF_FLOW_HW, &flow->flags)) {
		nf_flow_offload_stats(flow_table, flow);
	}
}

static void nf_flow_offload_work_gc(struct work_struct *work)
{
	struct nf_flowtable *flow_table;

	flow_table = container_of(work, struct nf_flowtable, gc_work.work);
	nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table);
	queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
}

static void nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
				 __be16 port, __be16 new_port)
{
	struct tcphdr *tcph;

	tcph = (void *)(skb_network_header(skb) + thoff);
	inet_proto_csum_replace2(&tcph->check, skb, port, new_port, false);
}

static void nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff,
				 __be16 port, __be16 new_port)
{
	struct udphdr *udph;

	udph = (void *)(skb_network_header(skb) + thoff);
	if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {
		inet_proto_csum_replace2(&udph->check, skb, port,
					 new_port, false);
		if (!udph->check)
			udph->check = CSUM_MANGLED_0;
	}
}

static void nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff,
			     u8 protocol, __be16 port, __be16 new_port)
{
	switch (protocol) {
	case IPPROTO_TCP:
		nf_flow_nat_port_tcp(skb, thoff, port, new_port);
		break;
	case IPPROTO_UDP:
		nf_flow_nat_port_udp(skb, thoff, port, new_port);
		break;
	}
}

void nf_flow_snat_port(const struct flow_offload *flow,
		       struct sk_buff *skb, unsigned int thoff,
		       u8 protocol, enum flow_offload_tuple_dir dir)
{
	struct flow_ports *hdr;
	__be16 port, new_port;

	hdr = (void *)(skb_network_header(skb) + thoff);

	switch (dir) {
	case FLOW_OFFLOAD_DIR_ORIGINAL:
		port = hdr->source;
		new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port;
		hdr->source = new_port;
		break;
	case FLOW_OFFLOAD_DIR_REPLY:
		port = hdr->dest;
		new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port;
		hdr->dest = new_port;
		break;
	}

	nf_flow_nat_port(skb, thoff, protocol, port, new_port);
}
EXPORT_SYMBOL_GPL(nf_flow_snat_port);

void nf_flow_dnat_port(const struct flow_offload *flow, struct sk_buff *skb,
		       unsigned int thoff, u8 protocol,
		       enum flow_offload_tuple_dir dir)
{
	struct flow_ports *hdr;
	__be16 port, new_port;

	hdr = (void *)(skb_network_header(skb) + thoff);

	switch (dir) {
	case FLOW_OFFLOAD_DIR_ORIGINAL:
		port = hdr->dest;
		new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port;
		hdr->dest = new_port;
		break;
	case FLOW_OFFLOAD_DIR_REPLY:
		port = hdr->source;
		new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port;
		hdr->source = new_port;
		break;
	}

	nf_flow_nat_port(skb, thoff, protocol, port, new_port);
}
EXPORT_SYMBOL_GPL(nf_flow_dnat_port);

int nf_flow_table_init(struct nf_flowtable *flowtable)
{
	int err;

	INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
	flow_block_init(&flowtable->flow_block);
	init_rwsem(&flowtable->flow_block_lock);

	err = rhashtable_init(&flowtable->rhashtable,
			      &nf_flow_offload_rhash_params);
	if (err < 0)
		return err;

	queue_delayed_work(system_power_efficient_wq,
			   &flowtable->gc_work, HZ);

	mutex_lock(&flowtable_lock);
	list_add(&flowtable->list, &flowtables);
	mutex_unlock(&flowtable_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(nf_flow_table_init);

static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data)
{
	struct net_device *dev = data;

	if (!dev) {
		flow_offload_teardown(flow);
		return;
	}

	if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) &&
	    (flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
	     flow->tuplehash[1].tuple.iifidx == dev->ifindex))
		flow_offload_teardown(flow);
}

void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
			      struct net_device *dev)
{
	nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);
	flush_delayed_work(&flowtable->gc_work);
	nf_flow_table_offload_flush(flowtable);
}

void nf_flow_table_cleanup(struct net_device *dev)
{
	struct nf_flowtable *flowtable;

	mutex_lock(&flowtable_lock);
	list_for_each_entry(flowtable, &flowtables, list)
		nf_flow_table_gc_cleanup(flowtable, dev);
	mutex_unlock(&flowtable_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);

void nf_flow_table_free(struct nf_flowtable *flow_table)
{
	mutex_lock(&flowtable_lock);
	list_del(&flow_table->list);
	mutex_unlock(&flowtable_lock);

	cancel_delayed_work_sync(&flow_table->gc_work);
	nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
	nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table);
	nf_flow_table_offload_flush(flow_table);
	if (nf_flowtable_hw_offload(flow_table))
		nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step,
				      flow_table);
	rhashtable_destroy(&flow_table->rhashtable);
}
EXPORT_SYMBOL_GPL(nf_flow_table_free);

static int __init nf_flow_table_module_init(void)
{
	return nf_flow_table_offload_init();
}

static void __exit nf_flow_table_module_exit(void)
{
	nf_flow_table_offload_exit();
}

module_init(nf_flow_table_module_init);
module_exit(nf_flow_table_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_DESCRIPTION("Netfilter flow table module");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
ac2a6666 PNA	2	#include <linux/kernel.h>
	3	#include <linux/init.h>
	4	#include <linux/module.h>
	5	#include <linux/netfilter.h>
	6	#include <linux/rhashtable.h>
	7	#include <linux/netdevice.h>
4f3780c0 FF	8	#include <net/ip.h>
4f3780c0 FF	9	#include <net/ip6_route.h>
c0ea1bcb	10	#include <net/netfilter/nf_tables.h>
ac2a6666 PNA	11	#include <net/netfilter/nf_flow_table.h>
	12	#include <net/netfilter/nf_conntrack.h>
	13	#include <net/netfilter/nf_conntrack_core.h>
40d102cd	14	#include <net/netfilter/nf_conntrack_l4proto.h>
ac2a6666 PNA	15	#include <net/netfilter/nf_conntrack_tuple.h>
ac2a6666 PNA	16
84453a90 FF	17	static DEFINE_MUTEX(flowtable_lock);
	18	static LIST_HEAD(flowtables);
	19
047b300e	20	static void
458a1828	21	flow_offload_fill_dir(struct flow_offload *flow,
047b300e FF	22	enum flow_offload_tuple_dir dir)
	23	{
	24	struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple;
458a1828	25	struct nf_conntrack_tuple *ctt = &flow->ct->tuplehash[dir].tuple;
047b300e FF	26
	27	ft->dir = dir;
	28
	29	switch (ctt->src.l3num) {
	30	case NFPROTO_IPV4:
	31	ft->src_v4 = ctt->src.u3.in;
	32	ft->dst_v4 = ctt->dst.u3.in;
	33	break;
	34	case NFPROTO_IPV6:
	35	ft->src_v6 = ctt->src.u3.in6;
	36	ft->dst_v6 = ctt->dst.u3.in6;
	37	break;
	38	}
	39
	40	ft->l3proto = ctt->src.l3num;
	41	ft->l4proto = ctt->dst.protonum;
	42	ft->src_port = ctt->src.u.tcp.port;
	43	ft->dst_port = ctt->dst.u.tcp.port;
047b300e FF	44	}
047b300e FF	45
f1363e05	46	struct flow_offload flow_offload_alloc(struct nf_conn ct)
ac2a6666	47	{
ac2a6666 PNA	48	struct flow_offload *flow;
	49
	50	if (unlikely(nf_ct_is_dying(ct) \|\|
	51	!atomic_inc_not_zero(&ct->ct_general.use)))
	52	return NULL;
	53
62248df8 PNA	54	flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
62248df8 PNA	55	if (!flow)
ac2a6666 PNA	56	goto err_ct_refcnt;
ac2a6666 PNA	57
b32d2f34	58	flow->ct = ct;
ac2a6666	59
458a1828	60	flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
458a1828	61	flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_REPLY);
ac2a6666 PNA	62
ac2a6666 PNA	63	if (ct->status & IPS_SRC_NAT)
355a8b13	64	__set_bit(NF_FLOW_SNAT, &flow->flags);
df1e2025	65	if (ct->status & IPS_DST_NAT)
355a8b13	66	__set_bit(NF_FLOW_DNAT, &flow->flags);
ac2a6666 PNA	67
	68	return flow;
	69
ac2a6666 PNA	70	err_ct_refcnt:
	71	nf_ct_put(ct);
	72
	73	return NULL;
	74	}
	75	EXPORT_SYMBOL_GPL(flow_offload_alloc);
	76
f1363e05 PNA	77	static int flow_offload_fill_route(struct flow_offload *flow,
	78	const struct nf_flow_route *route,
	79	enum flow_offload_tuple_dir dir)
	80	{
	81	struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
f1363e05	82	struct dst_entry *dst = route->tuple[dir].dst;
4cd91f7c	83	int i, j = 0;
f1363e05	84
f1363e05 PNA	85	switch (flow_tuple->l3proto) {
	86	case NFPROTO_IPV4:
	87	flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true);
	88	break;
	89	case NFPROTO_IPV6:
	90	flow_tuple->mtu = ip6_dst_mtu_forward(dst);
	91	break;
	92	}
	93
c63a7cc4	94	flow_tuple->iifidx = route->tuple[dir].in.ifindex;
4cd91f7c PNA	95	for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) {
	96	flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id;
	97	flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto;
	98	j++;
	99	}
	100	flow_tuple->encap_num = route->tuple[dir].in.num_encaps;
7a27f6ab PNA	101
	102	switch (route->tuple[dir].xmit_type) {
	103	case FLOW_OFFLOAD_XMIT_DIRECT:
	104	memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest,
	105	ETH_ALEN);
	106	memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source,
	107	ETH_ALEN);
	108	flow_tuple->out.ifidx = route->tuple[dir].out.ifindex;
	109	break;
	110	case FLOW_OFFLOAD_XMIT_XFRM:
	111	case FLOW_OFFLOAD_XMIT_NEIGH:
	112	if (!dst_hold_safe(route->tuple[dir].dst))
	113	return -1;
	114
	115	flow_tuple->dst_cache = dst;
	116	break;
	117	}
5139c0c0	118	flow_tuple->xmit_type = route->tuple[dir].xmit_type;
f1363e05 PNA	119
	120	return 0;
	121	}
	122
7a27f6ab PNA	123	static void nft_flow_dst_release(struct flow_offload *flow,
	124	enum flow_offload_tuple_dir dir)
	125	{
	126	if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH \|\|
	127	flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)
	128	dst_release(flow->tuplehash[dir].tuple.dst_cache);
	129	}
	130
f1363e05 PNA	131	int flow_offload_route_init(struct flow_offload *flow,
	132	const struct nf_flow_route *route)
	133	{
	134	int err;
	135
	136	err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL);
	137	if (err < 0)
	138	return err;
	139
	140	err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY);
	141	if (err < 0)
	142	goto err_route_reply;
	143
	144	flow->type = NF_FLOW_OFFLOAD_ROUTE;
	145
	146	return 0;
	147
	148	err_route_reply:
7a27f6ab	149	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
f1363e05 PNA	150
	151	return err;
	152	}
	153	EXPORT_SYMBOL_GPL(flow_offload_route_init);
	154
da5984e5 FF	155	static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
	156	{
	157	tcp->state = TCP_CONNTRACK_ESTABLISHED;
	158	tcp->seen[0].td_maxwin = 0;
	159	tcp->seen[1].td_maxwin = 0;
	160	}
	161
e97d9404 FW	162	#define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT (120 * HZ)
	163	#define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT (30 * HZ)
	164
1e5b2471	165	static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
da5984e5 FF	166	{
da5984e5 FF	167	const struct nf_conntrack_l4proto *l4proto;
1e5b2471	168	int l4num = nf_ct_protonum(ct);
da5984e5	169	unsigned int timeout;
da5984e5	170
4a60dc74	171	l4proto = nf_ct_l4proto_find(l4num);
da5984e5 FF	172	if (!l4proto)
	173	return;
	174
da5984e5	175	if (l4num == IPPROTO_TCP)
e97d9404	176	timeout = NF_FLOWTABLE_TCP_PICKUP_TIMEOUT;
da5984e5	177	else if (l4num == IPPROTO_UDP)
e97d9404	178	timeout = NF_FLOWTABLE_UDP_PICKUP_TIMEOUT;
da5984e5 FF	179	else
	180	return;
	181
1e5b2471 PNA	182	if (nf_flow_timeout_delta(ct->timeout) > (__s32)timeout)
	183	ct->timeout = nfct_time_stamp + timeout;
	184	}
	185
	186	static void flow_offload_fixup_ct_state(struct nf_conn *ct)
	187	{
	188	if (nf_ct_protonum(ct) == IPPROTO_TCP)
	189	flow_offload_fixup_tcp(&ct->proto.tcp);
	190	}
	191
	192	static void flow_offload_fixup_ct(struct nf_conn *ct)
	193	{
	194	flow_offload_fixup_ct_state(ct);
	195	flow_offload_fixup_ct_timeout(ct);
da5984e5 FF	196	}
da5984e5 FF	197
f1363e05	198	static void flow_offload_route_release(struct flow_offload *flow)
ac2a6666	199	{
7a27f6ab PNA	200	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
7a27f6ab PNA	201	nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_REPLY);
f1363e05 PNA	202	}
	203
	204	void flow_offload_free(struct flow_offload *flow)
	205	{
	206	switch (flow->type) {
	207	case NF_FLOW_OFFLOAD_ROUTE:
	208	flow_offload_route_release(flow);
	209	break;
	210	default:
	211	break;
	212	}
b32d2f34	213	nf_ct_put(flow->ct);
62248df8	214	kfree_rcu(flow, rcu_head);
ac2a6666 PNA	215	}
	216	EXPORT_SYMBOL_GPL(flow_offload_free);
	217
a268de77 FF	218	static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
	219	{
	220	const struct flow_offload_tuple *tuple = data;
	221
dbc859d9	222	return jhash(tuple, offsetof(struct flow_offload_tuple, __hash), seed);
a268de77 FF	223	}
	224
	225	static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed)
	226	{
	227	const struct flow_offload_tuple_rhash *tuplehash = data;
	228
dbc859d9	229	return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, __hash), seed);
a268de77 FF	230	}
	231
	232	static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg,
	233	const void *ptr)
	234	{
	235	const struct flow_offload_tuple *tuple = arg->key;
	236	const struct flow_offload_tuple_rhash *x = ptr;
	237
dbc859d9	238	if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, __hash)))
a268de77 FF	239	return 1;
	240
	241	return 0;
	242	}
	243
	244	static const struct rhashtable_params nf_flow_offload_rhash_params = {
	245	.head_offset = offsetof(struct flow_offload_tuple_rhash, node),
	246	.hashfn = flow_offload_hash,
	247	.obj_hashfn = flow_offload_hash_obj,
	248	.obj_cmpfn = flow_offload_hash_cmp,
	249	.automatic_shrinking = true,
	250	};
	251
ac2a6666 PNA	252	int flow_offload_add(struct nf_flowtable flow_table, struct flow_offload flow)
ac2a6666 PNA	253	{
43c8f131 TY	254	int err;
43c8f131 TY	255
fb46f1b7	256	flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
daf61b02	257
43c8f131 TY	258	err = rhashtable_insert_fast(&flow_table->rhashtable,
	259	&flow->tuplehash[0].node,
	260	nf_flow_offload_rhash_params);
	261	if (err < 0)
	262	return err;
	263
	264	err = rhashtable_insert_fast(&flow_table->rhashtable,
	265	&flow->tuplehash[1].node,
	266	nf_flow_offload_rhash_params);
	267	if (err < 0) {
	268	rhashtable_remove_fast(&flow_table->rhashtable,
	269	&flow->tuplehash[0].node,
	270	nf_flow_offload_rhash_params);
	271	return err;
	272	}
ac2a6666	273
4203b19c RD	274	nf_ct_offload_timeout(flow->ct);
4203b19c RD	275
f698fe40 PNA	276	if (nf_flowtable_hw_offload(flow_table)) {
f698fe40 PNA	277	__set_bit(NF_FLOW_HW, &flow->flags);
c29f74e0	278	nf_flow_offload_add(flow_table, flow);
f698fe40	279	}
c29f74e0	280
ac2a6666 PNA	281	return 0;
	282	}
	283	EXPORT_SYMBOL_GPL(flow_offload_add);
	284
8b3646d6 PB	285	void flow_offload_refresh(struct nf_flowtable *flow_table,
	286	struct flow_offload *flow)
	287	{
	288	flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
	289
	290	if (likely(!nf_flowtable_hw_offload(flow_table) \|\|
	291	!test_and_clear_bit(NF_FLOW_HW_REFRESH, &flow->flags)))
	292	return;
	293
	294	nf_flow_offload_add(flow_table, flow);
	295	}
	296	EXPORT_SYMBOL_GPL(flow_offload_refresh);
	297
3e68db2f PNA	298	static inline bool nf_flow_has_expired(const struct flow_offload *flow)
3e68db2f PNA	299	{
1e5b2471	300	return nf_flow_timeout_delta(flow->timeout) <= 0;
3e68db2f PNA	301	}
3e68db2f PNA	302
0ff90b6c FF	303	static void flow_offload_del(struct nf_flowtable *flow_table,
0ff90b6c FF	304	struct flow_offload *flow)
ac2a6666	305	{
ac2a6666 PNA	306	rhashtable_remove_fast(&flow_table->rhashtable,
ac2a6666 PNA	307	&flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
a268de77	308	nf_flow_offload_rhash_params);
ac2a6666 PNA	309	rhashtable_remove_fast(&flow_table->rhashtable,
ac2a6666 PNA	310	&flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
a268de77	311	nf_flow_offload_rhash_params);
ac2a6666	312
b32d2f34	313	clear_bit(IPS_OFFLOAD_BIT, &flow->ct->status);
da5984e5	314
3e68db2f	315	if (nf_flow_has_expired(flow))
b32d2f34	316	flow_offload_fixup_ct(flow->ct);
9ed81c8e	317	else
b32d2f34	318	flow_offload_fixup_ct_timeout(flow->ct);
3e68db2f	319
0ff90b6c	320	flow_offload_free(flow);
ac2a6666	321	}
ac2a6666	322
59c466dd FF	323	void flow_offload_teardown(struct flow_offload *flow)
59c466dd FF	324	{
355a8b13	325	set_bit(NF_FLOW_TEARDOWN, &flow->flags);
da5984e5	326
b32d2f34	327	flow_offload_fixup_ct_state(flow->ct);
59c466dd FF	328	}
	329	EXPORT_SYMBOL_GPL(flow_offload_teardown);
	330
ac2a6666 PNA	331	struct flow_offload_tuple_rhash *
	332	flow_offload_lookup(struct nf_flowtable *flow_table,
	333	struct flow_offload_tuple *tuple)
	334	{
ba03137f FF	335	struct flow_offload_tuple_rhash *tuplehash;
	336	struct flow_offload *flow;
	337	int dir;
	338
a2d88182 TY	339	tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple,
a2d88182 TY	340	nf_flow_offload_rhash_params);
ba03137f FF	341	if (!tuplehash)
	342	return NULL;
	343
	344	dir = tuplehash->tuple.dir;
	345	flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
355a8b13	346	if (test_bit(NF_FLOW_TEARDOWN, &flow->flags))
ba03137f FF	347	return NULL;
ba03137f FF	348
b32d2f34	349	if (unlikely(nf_ct_is_dying(flow->ct)))
8cd2bc98 TY	350	return NULL;
8cd2bc98 TY	351
ba03137f	352	return tuplehash;
ac2a6666 PNA	353	}
	354	EXPORT_SYMBOL_GPL(flow_offload_lookup);
	355
49de9c09 TY	356	static int
	357	nf_flow_table_iterate(struct nf_flowtable *flow_table,
	358	void (iter)(struct flow_offload flow, void *data),
	359	void *data)
ac2a6666 PNA	360	{
	361	struct flow_offload_tuple_rhash *tuplehash;
	362	struct rhashtable_iter hti;
	363	struct flow_offload *flow;
0de22baa	364	int err = 0;
ac2a6666	365
0de22baa	366	rhashtable_walk_enter(&flow_table->rhashtable, &hti);
ac2a6666 PNA	367	rhashtable_walk_start(&hti);
	368
	369	while ((tuplehash = rhashtable_walk_next(&hti))) {
	370	if (IS_ERR(tuplehash)) {
0de22baa TY	371	if (PTR_ERR(tuplehash) != -EAGAIN) {
	372	err = PTR_ERR(tuplehash);
	373	break;
	374	}
ac2a6666 PNA	375	continue;
	376	}
	377	if (tuplehash->tuple.dir)
	378	continue;
	379
	380	flow = container_of(tuplehash, struct flow_offload, tuplehash[0]);
	381
	382	iter(flow, data);
	383	}
ac2a6666 PNA	384	rhashtable_walk_stop(&hti);
	385	rhashtable_walk_exit(&hti);
	386
	387	return err;
	388	}
ac2a6666	389
b9660987	390	static void nf_flow_offload_gc_step(struct flow_offload flow, void data)
ac2a6666	391	{
b9660987	392	struct nf_flowtable *flow_table = data;
ac2a6666	393
9ed81c8e PNA	394	if (nf_flow_has_expired(flow) \|\| nf_ct_is_dying(flow->ct))
	395	set_bit(NF_FLOW_TEARDOWN, &flow->flags);
	396
	397	if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) {
355a8b13 PNA	398	if (test_bit(NF_FLOW_HW, &flow->flags)) {
355a8b13 PNA	399	if (!test_bit(NF_FLOW_HW_DYING, &flow->flags))
c29f74e0	400	nf_flow_offload_del(flow_table, flow);
355a8b13	401	else if (test_bit(NF_FLOW_HW_DEAD, &flow->flags))
c29f74e0 PNA	402	flow_offload_del(flow_table, flow);
	403	} else {
	404	flow_offload_del(flow_table, flow);
	405	}
355a8b13	406	} else if (test_bit(NF_FLOW_HW, &flow->flags)) {
79b9b685	407	nf_flow_offload_stats(flow_table, flow);
c29f74e0	408	}
b408c5b0 PNA	409	}
b408c5b0 PNA	410
a268de77	411	static void nf_flow_offload_work_gc(struct work_struct *work)
b408c5b0 PNA	412	{
	413	struct nf_flowtable *flow_table;
	414
	415	flow_table = container_of(work, struct nf_flowtable, gc_work.work);
b9660987	416	nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table);
ac2a6666 PNA	417	queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
ac2a6666 PNA	418	}
ac2a6666	419
f4401262 PNA	420	static void nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
f4401262 PNA	421	__be16 port, __be16 new_port)
ac2a6666 PNA	422	{
	423	struct tcphdr *tcph;
	424
ac2a6666	425	tcph = (void *)(skb_network_header(skb) + thoff);
8d6bca15	426	inet_proto_csum_replace2(&tcph->check, skb, port, new_port, false);
ac2a6666 PNA	427	}
ac2a6666 PNA	428
f4401262 PNA	429	static void nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff,
f4401262 PNA	430	__be16 port, __be16 new_port)
ac2a6666 PNA	431	{
	432	struct udphdr *udph;
	433
ac2a6666 PNA	434	udph = (void *)(skb_network_header(skb) + thoff);
	435	if (udph->check \|\| skb->ip_summed == CHECKSUM_PARTIAL) {
	436	inet_proto_csum_replace2(&udph->check, skb, port,
8d6bca15	437	new_port, false);
ac2a6666 PNA	438	if (!udph->check)
	439	udph->check = CSUM_MANGLED_0;
	440	}
ac2a6666 PNA	441	}
ac2a6666 PNA	442
f4401262 PNA	443	static void nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff,
f4401262 PNA	444	u8 protocol, __be16 port, __be16 new_port)
ac2a6666 PNA	445	{
	446	switch (protocol) {
	447	case IPPROTO_TCP:
f4401262	448	nf_flow_nat_port_tcp(skb, thoff, port, new_port);
ac2a6666 PNA	449	break;
ac2a6666 PNA	450	case IPPROTO_UDP:
f4401262	451	nf_flow_nat_port_udp(skb, thoff, port, new_port);
ac2a6666 PNA	452	break;
ac2a6666 PNA	453	}
ac2a6666 PNA	454	}
ac2a6666 PNA	455
f4401262 PNA	456	void nf_flow_snat_port(const struct flow_offload *flow,
	457	struct sk_buff *skb, unsigned int thoff,
	458	u8 protocol, enum flow_offload_tuple_dir dir)
ac2a6666 PNA	459	{
	460	struct flow_ports *hdr;
	461	__be16 port, new_port;
	462
ac2a6666 PNA	463	hdr = (void *)(skb_network_header(skb) + thoff);
	464
	465	switch (dir) {
	466	case FLOW_OFFLOAD_DIR_ORIGINAL:
	467	port = hdr->source;
	468	new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port;
	469	hdr->source = new_port;
	470	break;
	471	case FLOW_OFFLOAD_DIR_REPLY:
	472	port = hdr->dest;
	473	new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port;
	474	hdr->dest = new_port;
	475	break;
ac2a6666 PNA	476	}
ac2a6666 PNA	477
f4401262	478	nf_flow_nat_port(skb, thoff, protocol, port, new_port);
ac2a6666 PNA	479	}
	480	EXPORT_SYMBOL_GPL(nf_flow_snat_port);
	481
f4401262 PNA	482	void nf_flow_dnat_port(const struct flow_offload flow, struct sk_buff skb,
	483	unsigned int thoff, u8 protocol,
	484	enum flow_offload_tuple_dir dir)
ac2a6666 PNA	485	{
	486	struct flow_ports *hdr;
	487	__be16 port, new_port;
	488
ac2a6666 PNA	489	hdr = (void *)(skb_network_header(skb) + thoff);
	490
	491	switch (dir) {
	492	case FLOW_OFFLOAD_DIR_ORIGINAL:
	493	port = hdr->dest;
	494	new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port;
	495	hdr->dest = new_port;
	496	break;
	497	case FLOW_OFFLOAD_DIR_REPLY:
	498	port = hdr->source;
	499	new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port;
	500	hdr->source = new_port;
	501	break;
ac2a6666 PNA	502	}
ac2a6666 PNA	503
f4401262	504	nf_flow_nat_port(skb, thoff, protocol, port, new_port);
ac2a6666 PNA	505	}
	506	EXPORT_SYMBOL_GPL(nf_flow_dnat_port);
	507
a268de77 FF	508	int nf_flow_table_init(struct nf_flowtable *flowtable)
	509	{
	510	int err;
	511
	512	INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
c29f74e0	513	flow_block_init(&flowtable->flow_block);
422c032a	514	init_rwsem(&flowtable->flow_block_lock);
a268de77 FF	515
	516	err = rhashtable_init(&flowtable->rhashtable,
	517	&nf_flow_offload_rhash_params);
	518	if (err < 0)
	519	return err;
	520
	521	queue_delayed_work(system_power_efficient_wq,
	522	&flowtable->gc_work, HZ);
	523
84453a90 FF	524	mutex_lock(&flowtable_lock);
	525	list_add(&flowtable->list, &flowtables);
	526	mutex_unlock(&flowtable_lock);
	527
a268de77 FF	528	return 0;
	529	}
	530	EXPORT_SYMBOL_GPL(nf_flow_table_init);
	531
c0ea1bcb PNA	532	static void nf_flow_table_do_cleanup(struct flow_offload flow, void data)
	533	{
	534	struct net_device *dev = data;
	535
59c466dd FF	536	if (!dev) {
59c466dd FF	537	flow_offload_teardown(flow);
c0ea1bcb	538	return;
59c466dd	539	}
b32d2f34 PNA	540
b32d2f34 PNA	541	if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) &&
a3fb3698 TY	542	(flow->tuplehash[0].tuple.iifidx == dev->ifindex \|\|
a3fb3698 TY	543	flow->tuplehash[1].tuple.iifidx == dev->ifindex))
445db8d0	544	flow_offload_teardown(flow);
c0ea1bcb PNA	545	}
c0ea1bcb PNA	546
a8284c68 PNA	547	void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
a8284c68 PNA	548	struct net_device *dev)
c0ea1bcb	549	{
84453a90	550	nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);
c0ea1bcb	551	flush_delayed_work(&flowtable->gc_work);
91bfaa15	552	nf_flow_table_offload_flush(flowtable);
c0ea1bcb PNA	553	}
c0ea1bcb PNA	554
5f1be84a	555	void nf_flow_table_cleanup(struct net_device *dev)
c0ea1bcb	556	{
84453a90 FF	557	struct nf_flowtable *flowtable;
	558
	559	mutex_lock(&flowtable_lock);
	560	list_for_each_entry(flowtable, &flowtables, list)
a8284c68	561	nf_flow_table_gc_cleanup(flowtable, dev);
84453a90	562	mutex_unlock(&flowtable_lock);
c0ea1bcb PNA	563	}
	564	EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
	565
b408c5b0 PNA	566	void nf_flow_table_free(struct nf_flowtable *flow_table)
b408c5b0 PNA	567	{
84453a90 FF	568	mutex_lock(&flowtable_lock);
	569	list_del(&flow_table->list);
	570	mutex_unlock(&flowtable_lock);
978703f4	571
a268de77	572	cancel_delayed_work_sync(&flow_table->gc_work);
b408c5b0	573	nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
b9660987	574	nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table);
0f34f30a	575	nf_flow_table_offload_flush(flow_table);
c921ffe8 PB	576	if (nf_flowtable_hw_offload(flow_table))
	577	nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step,
	578	flow_table);
a268de77	579	rhashtable_destroy(&flow_table->rhashtable);
b408c5b0 PNA	580	}
	581	EXPORT_SYMBOL_GPL(nf_flow_table_free);
	582
c29f74e0 PNA	583	static int __init nf_flow_table_module_init(void)
	584	{
	585	return nf_flow_table_offload_init();
	586	}
	587
	588	static void __exit nf_flow_table_module_exit(void)
	589	{
	590	nf_flow_table_offload_exit();
	591	}
	592
	593	module_init(nf_flow_table_module_init);
	594	module_exit(nf_flow_table_module_exit);
	595
ac2a6666 PNA	596	MODULE_LICENSE("GPL");
ac2a6666 PNA	597	MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
4cacc395	598	MODULE_DESCRIPTION("Netfilter flow table module");