datapath.c 50.1 KB
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/*
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 * Copyright (c) 2007-2012 Nicira, Inc.
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 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/jhash.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/etherdevice.h>
#include <linux/genetlink.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/ethtool.h>
#include <linux/wait.h>
#include <asm/div64.h>
#include <linux/highmem.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/inetdevice.h>
#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/openvswitch.h>
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
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#include <net/net_namespace.h>
#include <net/netns/generic.h>
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#include "datapath.h"
#include "flow.h"
#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
static void rehash_flow_table(struct work_struct *work);
static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);

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int ovs_net_id __read_mostly;

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static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
		       struct genl_multicast_group *grp)
{
	genl_notify(skb, genl_info_net(info), info->snd_portid,
		    grp->id, info->nlhdr, GFP_KERNEL);
}

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/**
 * DOC: Locking:
 *
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 * All writes e.g. Writes to device state (add/remove datapath, port, set
 * operations on vports, etc.), Writes to other state (flow table
 * modifications, set miscellaneous datapath parameters, etc.) are protected
 * by ovs_lock.
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 *
 * Reads are protected by RCU.
 *
 * There are a few special cases (mostly stats) that have their own
 * synchronization but they nest under all of above and don't interact with
 * each other.
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 *
 * The RTNL lock nests inside ovs_mutex.
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 */

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static DEFINE_MUTEX(ovs_mutex);

void ovs_lock(void)
{
	mutex_lock(&ovs_mutex);
}

void ovs_unlock(void)
{
	mutex_unlock(&ovs_mutex);
}

#ifdef CONFIG_LOCKDEP
int lockdep_ovsl_is_held(void)
{
	if (debug_locks)
		return lockdep_is_held(&ovs_mutex);
	else
		return 1;
}
#endif

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static struct vport *new_vport(const struct vport_parms *);
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static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
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			     const struct dp_upcall_info *);
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static int queue_userspace_packet(struct net *, int dp_ifindex,
				  struct sk_buff *,
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				  const struct dp_upcall_info *);

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/* Must be called with rcu_read_lock or ovs_mutex. */
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static struct datapath *get_dp(struct net *net, int dp_ifindex)
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{
	struct datapath *dp = NULL;
	struct net_device *dev;

	rcu_read_lock();
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	dev = dev_get_by_index_rcu(net, dp_ifindex);
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	if (dev) {
		struct vport *vport = ovs_internal_dev_get_vport(dev);
		if (vport)
			dp = vport->dp;
	}
	rcu_read_unlock();

	return dp;
}

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/* Must be called with rcu_read_lock or ovs_mutex. */
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const char *ovs_dp_name(const struct datapath *dp)
{
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	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
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	return vport->ops->get_name(vport);
}

static int get_dpifindex(struct datapath *dp)
{
	struct vport *local;
	int ifindex;

	rcu_read_lock();

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	local = ovs_vport_rcu(dp, OVSP_LOCAL);
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	if (local)
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		ifindex = netdev_vport_priv(local)->dev->ifindex;
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	else
		ifindex = 0;

	rcu_read_unlock();

	return ifindex;
}

static void destroy_dp_rcu(struct rcu_head *rcu)
{
	struct datapath *dp = container_of(rcu, struct datapath, rcu);

	ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
	free_percpu(dp->stats_percpu);
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	release_net(ovs_dp_get_net(dp));
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	kfree(dp->ports);
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	kfree(dp);
}

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static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
					    u16 port_no)
{
	return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
}

struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
{
	struct vport *vport;
	struct hlist_head *head;

	head = vport_hash_bucket(dp, port_no);
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	hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
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		if (vport->port_no == port_no)
			return vport;
	}
	return NULL;
}

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/* Called with ovs_mutex. */
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static struct vport *new_vport(const struct vport_parms *parms)
{
	struct vport *vport;

	vport = ovs_vport_add(parms);
	if (!IS_ERR(vport)) {
		struct datapath *dp = parms->dp;
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		struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
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		hlist_add_head_rcu(&vport->dp_hash_node, head);
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	}
	return vport;
}

void ovs_dp_detach_port(struct vport *p)
{
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	ASSERT_OVSL();
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	/* First drop references to device. */
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	hlist_del_rcu(&p->dp_hash_node);
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	/* Then destroy it. */
	ovs_vport_del(p);
}

/* Must be called with rcu_read_lock. */
void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
{
	struct datapath *dp = p->dp;
	struct sw_flow *flow;
	struct dp_stats_percpu *stats;
	struct sw_flow_key key;
	u64 *stats_counter;
	int error;
	int key_len;

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	stats = this_cpu_ptr(dp->stats_percpu);
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	/* Extract flow from 'skb' into 'key'. */
	error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
	if (unlikely(error)) {
		kfree_skb(skb);
		return;
	}

	/* Look up flow. */
	flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
	if (unlikely(!flow)) {
		struct dp_upcall_info upcall;

		upcall.cmd = OVS_PACKET_CMD_MISS;
		upcall.key = &key;
		upcall.userdata = NULL;
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		upcall.portid = p->upcall_portid;
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		ovs_dp_upcall(dp, skb, &upcall);
		consume_skb(skb);
		stats_counter = &stats->n_missed;
		goto out;
	}

	OVS_CB(skb)->flow = flow;

	stats_counter = &stats->n_hit;
	ovs_flow_used(OVS_CB(skb)->flow, skb);
	ovs_execute_actions(dp, skb);

out:
	/* Update datapath statistics. */
	u64_stats_update_begin(&stats->sync);
	(*stats_counter)++;
	u64_stats_update_end(&stats->sync);
}

static struct genl_family dp_packet_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
	.name = OVS_PACKET_FAMILY,
	.version = OVS_PACKET_VERSION,
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	.maxattr = OVS_PACKET_ATTR_MAX,
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	.netnsok = true,
	.parallel_ops = true,
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};

int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
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		  const struct dp_upcall_info *upcall_info)
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{
	struct dp_stats_percpu *stats;
	int dp_ifindex;
	int err;

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	if (upcall_info->portid == 0) {
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		err = -ENOTCONN;
		goto err;
	}

	dp_ifindex = get_dpifindex(dp);
	if (!dp_ifindex) {
		err = -ENODEV;
		goto err;
	}

	if (!skb_is_gso(skb))
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		err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
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	else
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		err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
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	if (err)
		goto err;

	return 0;

err:
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	stats = this_cpu_ptr(dp->stats_percpu);
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	u64_stats_update_begin(&stats->sync);
	stats->n_lost++;
	u64_stats_update_end(&stats->sync);

	return err;
}

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static int queue_gso_packets(struct net *net, int dp_ifindex,
			     struct sk_buff *skb,
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			     const struct dp_upcall_info *upcall_info)
{
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	unsigned short gso_type = skb_shinfo(skb)->gso_type;
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	struct dp_upcall_info later_info;
	struct sw_flow_key later_key;
	struct sk_buff *segs, *nskb;
	int err;

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	segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
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	if (IS_ERR(segs))
		return PTR_ERR(segs);
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	/* Queue all of the segments. */
	skb = segs;
	do {
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		err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
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		if (err)
			break;

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		if (skb == segs && gso_type & SKB_GSO_UDP) {
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			/* The initial flow key extracted by ovs_flow_extract()
			 * in this case is for a first fragment, so we need to
			 * properly mark later fragments.
			 */
			later_key = *upcall_info->key;
			later_key.ip.frag = OVS_FRAG_TYPE_LATER;

			later_info = *upcall_info;
			later_info.key = &later_key;
			upcall_info = &later_info;
		}
	} while ((skb = skb->next));

	/* Free all of the segments. */
	skb = segs;
	do {
		nskb = skb->next;
		if (err)
			kfree_skb(skb);
		else
			consume_skb(skb);
	} while ((skb = nskb));
	return err;
}

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static size_t key_attr_size(void)
{
	return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
		+ nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
		+ nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
		+ nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
		+ nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
		+ nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
		+ nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
		+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
}

static size_t upcall_msg_size(const struct sk_buff *skb,
			      const struct nlattr *userdata)
{
	size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
		+ nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
		+ nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */

	/* OVS_PACKET_ATTR_USERDATA */
	if (userdata)
		size += NLA_ALIGN(userdata->nla_len);

	return size;
}

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static int queue_userspace_packet(struct net *net, int dp_ifindex,
				  struct sk_buff *skb,
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				  const struct dp_upcall_info *upcall_info)
{
	struct ovs_header *upcall;
	struct sk_buff *nskb = NULL;
	struct sk_buff *user_skb; /* to be queued to userspace */
	struct nlattr *nla;
	int err;

	if (vlan_tx_tag_present(skb)) {
		nskb = skb_clone(skb, GFP_ATOMIC);
		if (!nskb)
			return -ENOMEM;

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		nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
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		if (!nskb)
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			return -ENOMEM;

		nskb->vlan_tci = 0;
		skb = nskb;
	}

	if (nla_attr_size(skb->len) > USHRT_MAX) {
		err = -EFBIG;
		goto out;
	}

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	user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
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	if (!user_skb) {
		err = -ENOMEM;
		goto out;
	}

	upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
			     0, upcall_info->cmd);
	upcall->dp_ifindex = dp_ifindex;

	nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
	ovs_flow_to_nlattrs(upcall_info->key, user_skb);
	nla_nest_end(user_skb, nla);

	if (upcall_info->userdata)
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		__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
			  nla_len(upcall_info->userdata),
			  nla_data(upcall_info->userdata));
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	nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);

	skb_copy_and_csum_dev(skb, nla_data(nla));

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	genlmsg_end(user_skb, upcall);
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	err = genlmsg_unicast(net, user_skb, upcall_info->portid);
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out:
	kfree_skb(nskb);
	return err;
}

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/* Called with ovs_mutex. */
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static int flush_flows(struct datapath *dp)
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{
	struct flow_table *old_table;
	struct flow_table *new_table;

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	old_table = ovsl_dereference(dp->table);
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	new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
	if (!new_table)
		return -ENOMEM;

	rcu_assign_pointer(dp->table, new_table);

	ovs_flow_tbl_deferred_destroy(old_table);
	return 0;
}

static int validate_actions(const struct nlattr *attr,
				const struct sw_flow_key *key, int depth);

static int validate_sample(const struct nlattr *attr,
				const struct sw_flow_key *key, int depth)
{
	const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
	const struct nlattr *probability, *actions;
	const struct nlattr *a;
	int rem;

	memset(attrs, 0, sizeof(attrs));
	nla_for_each_nested(a, attr, rem) {
		int type = nla_type(a);
		if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
			return -EINVAL;
		attrs[type] = a;
	}
	if (rem)
		return -EINVAL;

	probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
	if (!probability || nla_len(probability) != sizeof(u32))
		return -EINVAL;

	actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
	if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
		return -EINVAL;
	return validate_actions(actions, key, depth + 1);
}

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static int validate_tp_port(const struct sw_flow_key *flow_key)
{
	if (flow_key->eth.type == htons(ETH_P_IP)) {
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		if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
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			return 0;
	} else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
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		if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
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			return 0;
	}

	return -EINVAL;
}

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static int validate_set(const struct nlattr *a,
			const struct sw_flow_key *flow_key)
{
	const struct nlattr *ovs_key = nla_data(a);
	int key_type = nla_type(ovs_key);

	/* There can be only one key in a action */
	if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
		return -EINVAL;

	if (key_type > OVS_KEY_ATTR_MAX ||
	    nla_len(ovs_key) != ovs_key_lens[key_type])
		return -EINVAL;

	switch (key_type) {
	const struct ovs_key_ipv4 *ipv4_key;
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	const struct ovs_key_ipv6 *ipv6_key;
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	case OVS_KEY_ATTR_PRIORITY:
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	case OVS_KEY_ATTR_SKB_MARK:
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	case OVS_KEY_ATTR_ETHERNET:
		break;

	case OVS_KEY_ATTR_IPV4:
		if (flow_key->eth.type != htons(ETH_P_IP))
			return -EINVAL;

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		if (!flow_key->ip.proto)
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			return -EINVAL;

		ipv4_key = nla_data(ovs_key);
		if (ipv4_key->ipv4_proto != flow_key->ip.proto)
			return -EINVAL;

		if (ipv4_key->ipv4_frag != flow_key->ip.frag)
			return -EINVAL;

		break;

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	case OVS_KEY_ATTR_IPV6:
		if (flow_key->eth.type != htons(ETH_P_IPV6))
			return -EINVAL;

		if (!flow_key->ip.proto)
			return -EINVAL;

		ipv6_key = nla_data(ovs_key);
		if (ipv6_key->ipv6_proto != flow_key->ip.proto)
			return -EINVAL;

		if (ipv6_key->ipv6_frag != flow_key->ip.frag)
			return -EINVAL;

		if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
			return -EINVAL;

		break;

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	case OVS_KEY_ATTR_TCP:
		if (flow_key->ip.proto != IPPROTO_TCP)
			return -EINVAL;

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		return validate_tp_port(flow_key);
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	case OVS_KEY_ATTR_UDP:
		if (flow_key->ip.proto != IPPROTO_UDP)
			return -EINVAL;

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		return validate_tp_port(flow_key);
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	default:
		return -EINVAL;
	}

	return 0;
}

static int validate_userspace(const struct nlattr *attr)
{
	static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =	{
		[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
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		[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
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	};
	struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
	int error;

	error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
				 attr, userspace_policy);
	if (error)
		return error;

	if (!a[OVS_USERSPACE_ATTR_PID] ||
	    !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
		return -EINVAL;

	return 0;
}

static int validate_actions(const struct nlattr *attr,
				const struct sw_flow_key *key,  int depth)
{
	const struct nlattr *a;
	int rem, err;

	if (depth >= SAMPLE_ACTION_DEPTH)
		return -EOVERFLOW;

	nla_for_each_nested(a, attr, rem) {
		/* Expected argument lengths, (u32)-1 for variable length. */
		static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
			[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
			[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
			[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
			[OVS_ACTION_ATTR_POP_VLAN] = 0,
			[OVS_ACTION_ATTR_SET] = (u32)-1,
			[OVS_ACTION_ATTR_SAMPLE] = (u32)-1
		};
		const struct ovs_action_push_vlan *vlan;
		int type = nla_type(a);

		if (type > OVS_ACTION_ATTR_MAX ||
		    (action_lens[type] != nla_len(a) &&
		     action_lens[type] != (u32)-1))
			return -EINVAL;

		switch (type) {
		case OVS_ACTION_ATTR_UNSPEC:
			return -EINVAL;

		case OVS_ACTION_ATTR_USERSPACE:
			err = validate_userspace(a);
			if (err)
				return err;
			break;

		case OVS_ACTION_ATTR_OUTPUT:
			if (nla_get_u32(a) >= DP_MAX_PORTS)
				return -EINVAL;
			break;


		case OVS_ACTION_ATTR_POP_VLAN:
			break;

		case OVS_ACTION_ATTR_PUSH_VLAN:
			vlan = nla_data(a);
			if (vlan->vlan_tpid != htons(ETH_P_8021Q))
				return -EINVAL;
			if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
				return -EINVAL;
			break;

		case OVS_ACTION_ATTR_SET:
			err = validate_set(a, key);
			if (err)
				return err;
			break;

		case OVS_ACTION_ATTR_SAMPLE:
			err = validate_sample(a, key, depth);
			if (err)
				return err;
			break;

		default:
			return -EINVAL;
		}
	}

	if (rem > 0)
		return -EINVAL;

	return 0;
}

static void clear_stats(struct sw_flow *flow)
{
	flow->used = 0;
	flow->tcp_flags = 0;
	flow->packet_count = 0;
	flow->byte_count = 0;
}

static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
{
	struct ovs_header *ovs_header = info->userhdr;
	struct nlattr **a = info->attrs;
	struct sw_flow_actions *acts;
	struct sk_buff *packet;
	struct sw_flow *flow;
	struct datapath *dp;
	struct ethhdr *eth;
	int len;
	int err;
	int key_len;

	err = -EINVAL;
	if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
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	    !a[OVS_PACKET_ATTR_ACTIONS])
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		goto err;

	len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
	packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
	err = -ENOMEM;
	if (!packet)
		goto err;
	skb_reserve(packet, NET_IP_ALIGN);

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	nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
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	skb_reset_mac_header(packet);
	eth = eth_hdr(packet);

	/* Normally, setting the skb 'protocol' field would be handled by a
	 * call to eth_type_trans(), but it assumes there's a sending
	 * device, which we may not have. */
Simon Horman's avatar
Simon Horman committed
727
	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
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		packet->protocol = eth->h_proto;
	else
		packet->protocol = htons(ETH_P_802_2);

	/* Build an sw_flow for sending this packet. */
	flow = ovs_flow_alloc();
	err = PTR_ERR(flow);
	if (IS_ERR(flow))
		goto err_kfree_skb;

	err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
	if (err)
		goto err_flow_free;

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	err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
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	if (err)
		goto err_flow_free;

	err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
	if (err)
		goto err_flow_free;

	flow->hash = ovs_flow_hash(&flow->key, key_len);

	acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
	err = PTR_ERR(acts);
	if (IS_ERR(acts))
		goto err_flow_free;
	rcu_assign_pointer(flow->sf_acts, acts);

	OVS_CB(packet)->flow = flow;
	packet->priority = flow->key.phy.priority;
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	packet->mark = flow->key.phy.skb_mark;
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	rcu_read_lock();
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	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
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	err = -ENODEV;
	if (!dp)
		goto err_unlock;

	local_bh_disable();
	err = ovs_execute_actions(dp, packet);
	local_bh_enable();
	rcu_read_unlock();

	ovs_flow_free(flow);
	return err;

err_unlock:
	rcu_read_unlock();
err_flow_free:
	ovs_flow_free(flow);
err_kfree_skb:
	kfree_skb(packet);
err:
	return err;
}

static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
787
	[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
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	[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
	[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
};

static struct genl_ops dp_packet_genl_ops[] = {
	{ .cmd = OVS_PACKET_CMD_EXECUTE,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = packet_policy,
	  .doit = ovs_packet_cmd_execute
	}
};

static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
{
	int i;
803
	struct flow_table *table = ovsl_dereference(dp->table);
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	stats->n_flows = ovs_flow_tbl_count(table);

	stats->n_hit = stats->n_missed = stats->n_lost = 0;
	for_each_possible_cpu(i) {
		const struct dp_stats_percpu *percpu_stats;
		struct dp_stats_percpu local_stats;
		unsigned int start;

		percpu_stats = per_cpu_ptr(dp->stats_percpu, i);

		do {
			start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
			local_stats = *percpu_stats;
		} while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));

		stats->n_hit += local_stats.n_hit;
		stats->n_missed += local_stats.n_missed;
		stats->n_lost += local_stats.n_lost;
	}
}

static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
	[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
	[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
	[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
};

static struct genl_family dp_flow_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
	.name = OVS_FLOW_FAMILY,
	.version = OVS_FLOW_VERSION,
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	.maxattr = OVS_FLOW_ATTR_MAX,
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	.netnsok = true,
	.parallel_ops = true,
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};

static struct genl_multicast_group ovs_dp_flow_multicast_group = {
	.name = OVS_FLOW_MCGROUP
};

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static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
{
	return NLMSG_ALIGN(sizeof(struct ovs_header))
		+ nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
		+ nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
		+ nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
		+ nla_total_size(8) /* OVS_FLOW_ATTR_USED */
		+ nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
}

856
/* Called with ovs_mutex. */
857
static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
858
				  struct sk_buff *skb, u32 portid,
859 860 861 862 863 864 865 866 867 868 869
				  u32 seq, u32 flags, u8 cmd)
{
	const int skb_orig_len = skb->len;
	const struct sw_flow_actions *sf_acts;
	struct ovs_flow_stats stats;
	struct ovs_header *ovs_header;
	struct nlattr *nla;
	unsigned long used;
	u8 tcp_flags;
	int err;

870
	sf_acts = ovsl_dereference(flow->sf_acts);
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872
	ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
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	if (!ovs_header)
		return -EMSGSIZE;

	ovs_header->dp_ifindex = get_dpifindex(dp);

	nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
	if (!nla)
		goto nla_put_failure;
	err = ovs_flow_to_nlattrs(&flow->key, skb);
	if (err)
		goto error;
	nla_nest_end(skb, nla);

	spin_lock_bh(&flow->lock);
	used = flow->used;
	stats.n_packets = flow->packet_count;
	stats.n_bytes = flow->byte_count;
	tcp_flags = flow->tcp_flags;
	spin_unlock_bh(&flow->lock);

893 894 895
	if (used &&
	    nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
		goto nla_put_failure;
896

897 898 899 900
	if (stats.n_packets &&
	    nla_put(skb, OVS_FLOW_ATTR_STATS,
		    sizeof(struct ovs_flow_stats), &stats))
		goto nla_put_failure;
901

902 903 904
	if (tcp_flags &&
	    nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
		goto nla_put_failure;
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	/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
	 * this is the first flow to be dumped into 'skb'.  This is unusual for
	 * Netlink but individual action lists can be longer than
	 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
	 * The userspace caller can always fetch the actions separately if it
	 * really wants them.  (Most userspace callers in fact don't care.)
	 *
	 * This can only fail for dump operations because the skb is always
	 * properly sized for single flows.
	 */
	err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
		      sf_acts->actions);
	if (err < 0 && skb_orig_len)
		goto error;

	return genlmsg_end(skb, ovs_header);

nla_put_failure:
	err = -EMSGSIZE;
error:
	genlmsg_cancel(skb, ovs_header);
	return err;
}

static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
{
	const struct sw_flow_actions *sf_acts;

934
	sf_acts = ovsl_dereference(flow->sf_acts);
935

936
	return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
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}

static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
					       struct datapath *dp,
941
					       u32 portid, u32 seq, u8 cmd)
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{
	struct sk_buff *skb;
	int retval;

	skb = ovs_flow_cmd_alloc_info(flow);
	if (!skb)
		return ERR_PTR(-ENOMEM);

950
	retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
	BUG_ON(retval < 0);
	return skb;
}

static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
	struct sw_flow_key key;
	struct sw_flow *flow;
	struct sk_buff *reply;
	struct datapath *dp;
	struct flow_table *table;
	int error;
	int key_len;

	/* Extract key. */
	error = -EINVAL;
	if (!a[OVS_FLOW_ATTR_KEY])
		goto error;
	error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
	if (error)
		goto error;

	/* Validate actions. */
	if (a[OVS_FLOW_ATTR_ACTIONS]) {
		error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
		if (error)
			goto error;
	} else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
		error = -EINVAL;
		goto error;
	}

985
	ovs_lock();
986
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
987 988
	error = -ENODEV;
	if (!dp)
989
		goto err_unlock_ovs;
990

991
	table = ovsl_dereference(dp->table);
992 993 994 995 996 997 998
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
	if (!flow) {
		struct sw_flow_actions *acts;

		/* Bail out if we're not allowed to create a new flow. */
		error = -ENOENT;
		if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
999
			goto err_unlock_ovs;
1000 1001 1002 1003 1004 1005 1006 1007 1008

		/* Expand table, if necessary, to make room. */
		if (ovs_flow_tbl_need_to_expand(table)) {
			struct flow_table *new_table;

			new_table = ovs_flow_tbl_expand(table);
			if (!IS_ERR(new_table)) {
				rcu_assign_pointer(dp->table, new_table);
				ovs_flow_tbl_deferred_destroy(table);
1009
				table = ovsl_dereference(dp->table);
1010 1011 1012 1013 1014 1015 1016
			}
		}

		/* Allocate flow. */
		flow = ovs_flow_alloc();
		if (IS_ERR(flow)) {
			error = PTR_ERR(flow);
1017
			goto err_unlock_ovs;
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
		}
		flow->key = key;
		clear_stats(flow);

		/* Obtain actions. */
		acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
		error = PTR_ERR(acts);
		if (IS_ERR(acts))
			goto error_free_flow;
		rcu_assign_pointer(flow->sf_acts, acts);

		/* Put flow in bucket. */
		flow->hash = ovs_flow_hash(&key, key_len);
		ovs_flow_tbl_insert(table, flow);

1033
		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
						info->snd_seq,
						OVS_FLOW_CMD_NEW);
	} else {
		/* We found a matching flow. */
		struct sw_flow_actions *old_acts;
		struct nlattr *acts_attrs;

		/* Bail out if we're not allowed to modify an existing flow.
		 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
		 * because Generic Netlink treats the latter as a dump
		 * request.  We also accept NLM_F_EXCL in case that bug ever
		 * gets fixed.
		 */
		error = -EEXIST;
		if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
		    info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1050
			goto err_unlock_ovs;
1051 1052

		/* Update actions. */
1053
		old_acts = ovsl_dereference(flow->sf_acts);
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
		acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
		if (acts_attrs &&
		   (old_acts->actions_len != nla_len(acts_attrs) ||
		   memcmp(old_acts->actions, nla_data(acts_attrs),
			  old_acts->actions_len))) {
			struct sw_flow_actions *new_acts;

			new_acts = ovs_flow_actions_alloc(acts_attrs);
			error = PTR_ERR(new_acts);
			if (IS_ERR(new_acts))
1064
				goto err_unlock_ovs;
1065 1066 1067 1068 1069

			rcu_assign_pointer(flow->sf_acts, new_acts);
			ovs_flow_deferred_free_acts(old_acts);
		}

1070
		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1071 1072 1073 1074 1075 1076 1077 1078 1079
					       info->snd_seq, OVS_FLOW_CMD_NEW);

		/* Clear stats. */
		if (a[OVS_FLOW_ATTR_CLEAR]) {
			spin_lock_bh(&flow->lock);
			clear_stats(flow);
			spin_unlock_bh(&flow->lock);
		}
	}
1080
	ovs_unlock();
1081 1082

	if (!IS_ERR(reply))
1083
		ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1084
	else
1085
		netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1086 1087 1088 1089 1090
				ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
	return 0;

error_free_flow:
	ovs_flow_free(flow);
1091 1092
err_unlock_ovs:
	ovs_unlock();
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
error:
	return error;
}

static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
	struct sw_flow_key key;
	struct sk_buff *reply;
	struct sw_flow *flow;
	struct datapath *dp;
	struct flow_table *table;
	int err;
	int key_len;

	if (!a[OVS_FLOW_ATTR_KEY])
		return -EINVAL;
	err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
	if (err)
		return err;

1115
	ovs_lock();
1116
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1117 1118 1119 1120
	if (!dp) {
		err = -ENODEV;
		goto unlock;
	}
1121

1122
	table = ovsl_dereference(dp->table);
1123
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
1124 1125 1126 1127
	if (!flow) {
		err = -ENOENT;
		goto unlock;
	}
1128

1129
	reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1130
					info->snd_seq, OVS_FLOW_CMD_NEW);
1131 1132 1133 1134
	if (IS_ERR(reply)) {
		err = PTR_ERR(reply);
		goto unlock;
	}
1135

1136
	ovs_unlock();
1137
	return genlmsg_reply(reply, info);
1138 1139 1140
unlock:
	ovs_unlock();
	return err;
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
}

static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
	struct sw_flow_key key;
	struct sk_buff *reply;
	struct sw_flow *flow;
	struct datapath *dp;
	struct flow_table *table;
	int err;
	int key_len;

1155
	ovs_lock();
1156
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1157 1158 1159 1160
	if (!dp) {
		err = -ENODEV;
		goto unlock;
	}
1161

1162 1163 1164 1165
	if (!a[OVS_FLOW_ATTR_KEY]) {
		err = flush_flows(dp);
		goto unlock;
	}
1166 1167
	err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
	if (err)
1168
		goto unlock;
1169

1170
	table = ovsl_dereference(dp->table);
1171
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
1172 1173 1174 1175
	if (!flow) {
		err = -ENOENT;
		goto unlock;
	}
1176 1177

	reply = ovs_flow_cmd_alloc_info(flow);
1178 1179 1180 1181
	if (!reply) {
		err = -ENOMEM;
		goto unlock;
	}
1182 1183 1184

	ovs_flow_tbl_remove(table, flow);

1185
	err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1186 1187 1188 1189
				     info->snd_seq, 0, OVS_FLOW_CMD_DEL);
	BUG_ON(err < 0);

	ovs_flow_deferred_free(flow);
1190
	ovs_unlock();
1191

1192
	ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1193
	return 0;
1194 1195 1196
unlock:
	ovs_unlock();
	return err;
1197 1198 1199 1200 1201 1202 1203 1204
}

static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
	struct datapath *dp;
	struct flow_table *table;

1205
	ovs_lock();
1206
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1207 1208
	if (!dp) {
		ovs_unlock();
1209
		return -ENODEV;
1210
	}
1211

1212
	table = ovsl_dereference(dp->table);
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224

	for (;;) {
		struct sw_flow *flow;
		u32 bucket, obj;

		bucket = cb->args[0];
		obj = cb->args[1];
		flow = ovs_flow_tbl_next(table, &bucket, &obj);
		if (!flow)
			break;

		if (ovs_flow_cmd_fill_info(flow, dp, skb,
1225
					   NETLINK_CB(cb->skb).portid,
1226 1227 1228 1229 1230 1231 1232
					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
					   OVS_FLOW_CMD_NEW) < 0)
			break;

		cb->args[0] = bucket;
		cb->args[1] = obj;
	}
1233
	ovs_unlock();
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
	return skb->len;
}

static struct genl_ops dp_flow_genl_ops[] = {
	{ .cmd = OVS_FLOW_CMD_NEW,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = flow_policy,
	  .doit = ovs_flow_cmd_new_or_set
	},
	{ .cmd = OVS_FLOW_CMD_DEL,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = flow_policy,
	  .doit = ovs_flow_cmd_del
	},
	{ .cmd = OVS_FLOW_CMD_GET,
	  .flags = 0,		    /* OK for unprivileged users. */
	  .policy = flow_policy,
	  .doit = ovs_flow_cmd_get,
	  .dumpit = ovs_flow_cmd_dump
	},
	{ .cmd = OVS_FLOW_CMD_SET,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = flow_policy,
	  .doit = ovs_flow_cmd_new_or_set,
	},
};

static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
	[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
	[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
};

static struct genl_family dp_datapath_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
	.name = OVS_DATAPATH_FAMILY,
	.version = OVS_DATAPATH_VERSION,
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	.maxattr = OVS_DP_ATTR_MAX,
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	.netnsok = true,
	.parallel_ops = true,
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};

static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
	.name = OVS_DATAPATH_MCGROUP
};

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static size_t ovs_dp_cmd_msg_size(void)
{
	size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));

	msgsize += nla_total_size(IFNAMSIZ);
	msgsize += nla_total_size(sizeof(struct ovs_dp_stats));

	return msgsize;
}

1290
static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1291
				u32 portid, u32 seq, u32 flags, u8 cmd)
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{
	struct ovs_header *ovs_header;
	struct ovs_dp_stats dp_stats;
	int err;

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	ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
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				   flags, cmd);
	if (!ovs_header)
		goto error;

	ovs_header->dp_ifindex = get_dpifindex(dp);

	rcu_read_lock();
	err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
	rcu_read_unlock();
	if (err)
		goto nla_put_failure;

	get_dp_stats(dp, &dp_stats);
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	if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
		goto nla_put_failure;
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	return genlmsg_end(skb, ovs_header);

nla_put_failure:
	genlmsg_cancel(skb, ovs_header);
error:
	return -EMSGSIZE;
}

1322
static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
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					     u32 seq, u8 cmd)
{
	struct sk_buff *skb;
	int retval;

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	skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
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	if (!skb)
		return ERR_PTR(-ENOMEM);

1332
	retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
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	if (retval < 0) {
		kfree_skb(skb);
		return ERR_PTR(retval);
	}
	return skb;
}

1340
/* Called with ovs_mutex. */
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static struct datapath *lookup_datapath(struct net *net,
					struct ovs_header *ovs_header,
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					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
{
	struct datapath *dp;

	if (!a[OVS_DP_ATTR_NAME])
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		dp = get_dp(net, ovs_header->dp_ifindex);
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	else {
		struct vport *vport;

		rcu_read_lock();
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		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
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		dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
		rcu_read_unlock();
	}
	return dp ? dp : ERR_PTR(-ENODEV);
}

static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct vport_parms parms;
	struct sk_buff *reply;
	struct datapath *dp;
	struct vport *vport;
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	struct ovs_net *ovs_net;
1368
	int err, i;
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	err = -EINVAL;
	if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
		goto err;

1374
	ovs_lock();
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	err = -ENOMEM;
	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
	if (dp == NULL)
1379
		goto err_unlock_ovs;
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