datapath.c 47.4 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>
#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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/**
 * struct ovs_net - Per net-namespace data for ovs.
 * @dps: List of datapaths to enable dumping them all out.
 * Protected by genl_mutex.
 */
struct ovs_net {
	struct list_head dps;
};

static int ovs_net_id __read_mostly;

#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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/**
 * DOC: Locking:
 *
 * Writes to device state (add/remove datapath, port, set operations on vports,
 * etc.) are protected by RTNL.
 *
 * Writes to other state (flow table modifications, set miscellaneous datapath
 * parameters, etc.) are protected by genl_mutex.  The RTNL lock nests inside
 * genl_mutex.
 *
 * 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.
 */

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 *);

/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
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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;
}

/* Must be called with rcu_read_lock or RTNL lock. */
const char *ovs_dp_name(const struct datapath *dp)
{
	struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
	return vport->ops->get_name(vport);
}

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

	rcu_read_lock();

	local = rcu_dereference(dp->ports[OVSP_LOCAL]);
	if (local)
		ifindex = local->ops->get_ifindex(local);
	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);
}

/* Called with RTNL lock and genl_lock. */
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;

		rcu_assign_pointer(dp->ports[parms->port_no], vport);
		list_add(&vport->node, &dp->port_list);
	}

	return vport;
}

/* Called with RTNL lock. */
void ovs_dp_detach_port(struct vport *p)
{
	ASSERT_RTNL();

	/* First drop references to device. */
	list_del(&p->node);
	rcu_assign_pointer(p->dp->ports[p->port_no], NULL);

	/* 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;

	stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());

	/* 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;
		upcall.pid = p->upcall_pid;
		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,
	.netnsok = 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;

	if (upcall_info->pid == 0) {
		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:
	stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());

	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;

	segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
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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 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;
	unsigned int len;
	int err;

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

		nskb = __vlan_put_tag(nskb, 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;
	}

	len = sizeof(struct ovs_header);
	len += nla_total_size(skb->len);
	len += nla_total_size(FLOW_BUFSIZE);
	if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
		len += nla_total_size(8);

	user_skb = genlmsg_new(len, GFP_ATOMIC);
	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)
		nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
			    nla_get_u64(upcall_info->userdata));

	nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);

	skb_copy_and_csum_dev(skb, nla_data(nla));

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

/* Called with genl_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;

	old_table = genl_dereference(dp->table);
	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)) {
		if (flow_key->ipv4.tp.src && flow_key->ipv4.tp.dst)
			return 0;
	} else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
		if (flow_key->ipv6.tp.src && flow_key->ipv6.tp.dst)
			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;

	case OVS_KEY_ATTR_PRIORITY:
	case OVS_KEY_ATTR_ETHERNET:
		break;

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

		if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
			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;

	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 },
		[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
	};
	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] ||
	    !a[OVS_PACKET_ATTR_ACTIONS] ||
	    nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
		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);

	memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);

	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. */
	if (ntohs(eth->h_proto) >= 1536)
		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;

	err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
					     &flow->key.phy.in_port,
					     a[OVS_PACKET_ATTR_KEY]);
	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;

	rcu_read_lock();
679
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
	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] = {
	[OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
	[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;
	struct flow_table *table = genl_dereference(dp->table);

	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,
753 754
	.maxattr = OVS_FLOW_ATTR_MAX,
	.netnsok = true
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798
};

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

/* Called with genl_lock. */
static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
				  struct sk_buff *skb, u32 pid,
				  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;

	sf_acts = rcu_dereference_protected(flow->sf_acts,
					    lockdep_genl_is_held());

	ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
	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);

799 800 801
	if (used &&
	    nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
		goto nla_put_failure;
802

803 804 805 806
	if (stats.n_packets &&
	    nla_put(skb, OVS_FLOW_ATTR_STATS,
		    sizeof(struct ovs_flow_stats), &stats))
		goto nla_put_failure;
807

808 809 810
	if (tcp_flags &&
	    nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
		goto nla_put_failure;
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905

	/* 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;
	int len;

	sf_acts = rcu_dereference_protected(flow->sf_acts,
					    lockdep_genl_is_held());

	/* OVS_FLOW_ATTR_KEY */
	len = nla_total_size(FLOW_BUFSIZE);
	/* OVS_FLOW_ATTR_ACTIONS */
	len += nla_total_size(sf_acts->actions_len);
	/* OVS_FLOW_ATTR_STATS */
	len += nla_total_size(sizeof(struct ovs_flow_stats));
	/* OVS_FLOW_ATTR_TCP_FLAGS */
	len += nla_total_size(1);
	/* OVS_FLOW_ATTR_USED */
	len += nla_total_size(8);

	len += NLMSG_ALIGN(sizeof(struct ovs_header));

	return genlmsg_new(len, GFP_KERNEL);
}

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

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

	retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
	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;
	}

906
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
	error = -ENODEV;
	if (!dp)
		goto error;

	table = genl_dereference(dp->table);
	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)
			goto error;

		/* 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);
				table = genl_dereference(dp->table);
			}
		}

		/* Allocate flow. */
		flow = ovs_flow_alloc();
		if (IS_ERR(flow)) {
			error = PTR_ERR(flow);
			goto error;
		}
		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);

		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
						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))
			goto error;

		/* Update actions. */
		old_acts = rcu_dereference_protected(flow->sf_acts,
						     lockdep_genl_is_held());
		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))
				goto error;

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

		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
					       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);
		}
	}

	if (!IS_ERR(reply))
		genl_notify(reply, genl_info_net(info), info->snd_pid,
			   ovs_dp_flow_multicast_group.id, info->nlhdr,
			   GFP_KERNEL);
	else
1007
		netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
				ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
	return 0;

error_free_flow:
	ovs_flow_free(flow);
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;

1035
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	if (!dp)
		return -ENODEV;

	table = genl_dereference(dp->table);
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
	if (!flow)
		return -ENOENT;

	reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
					info->snd_seq, OVS_FLOW_CMD_NEW);
	if (IS_ERR(reply))
		return PTR_ERR(reply);

	return genlmsg_reply(reply, info);
}

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;

1064 1065 1066 1067
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
	if (!dp)
		return -ENODEV;

1068
	if (!a[OVS_FLOW_ATTR_KEY])
1069 1070
		return flush_flows(dp);

1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
	err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
	if (err)
		return err;

	table = genl_dereference(dp->table);
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
	if (!flow)
		return -ENOENT;

	reply = ovs_flow_cmd_alloc_info(flow);
	if (!reply)
		return -ENOMEM;

	ovs_flow_tbl_remove(table, flow);

	err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
				     info->snd_seq, 0, OVS_FLOW_CMD_DEL);
	BUG_ON(err < 0);

	ovs_flow_deferred_free(flow);

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
	return 0;
}

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;

1103
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	if (!dp)
		return -ENODEV;

	table = genl_dereference(dp->table);

	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,
					   NETLINK_CB(cb->skb).pid,
					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
					   OVS_FLOW_CMD_NEW) < 0)
			break;

		cb->args[0] = bucket;
		cb->args[1] = obj;
	}
	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,
1165 1166
	.maxattr = OVS_DP_ATTR_MAX,
	.netnsok = true
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
};

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

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

	ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
				   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);
1194 1195
	if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
		goto nla_put_failure;
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223

	return genlmsg_end(skb, ovs_header);

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

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

	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!skb)
		return ERR_PTR(-ENOMEM);

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

/* Called with genl_mutex and optionally with RTNL lock also. */
1224 1225
static struct datapath *lookup_datapath(struct net *net,
					struct ovs_header *ovs_header,
1226 1227 1228 1229 1230
					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
{
	struct datapath *dp;

	if (!a[OVS_DP_ATTR_NAME])
1231
		dp = get_dp(net, ovs_header->dp_ifindex);
1232 1233 1234 1235
	else {
		struct vport *vport;

		rcu_read_lock();
1236
		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
		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;
1250
	struct ovs_net *ovs_net;
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
	int err;

	err = -EINVAL;
	if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
		goto err;

	rtnl_lock();

	err = -ENOMEM;
	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
	if (dp == NULL)
1262 1263
		goto err_unlock_rtnl;

1264
	INIT_LIST_HEAD(&dp->port_list);
1265
	ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301

	/* Allocate table. */
	err = -ENOMEM;
	rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
	if (!dp->table)
		goto err_free_dp;

	dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
	if (!dp->stats_percpu) {
		err = -ENOMEM;
		goto err_destroy_table;
	}

	/* Set up our datapath device. */
	parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
	parms.type = OVS_VPORT_TYPE_INTERNAL;
	parms.options = NULL;
	parms.dp = dp;
	parms.port_no = OVSP_LOCAL;
	parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);

	vport = new_vport(&parms);
	if (IS_ERR(vport)) {
		err = PTR_ERR(vport);
		if (err == -EBUSY)
			err = -EEXIST;

		goto err_destroy_percpu;
	}

	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
				      info->snd_seq, OVS_DP_CMD_NEW);
	err = PTR_ERR(reply);
	if (IS_ERR(reply))
		goto err_destroy_local_port;

1302 1303
	ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
	list_add_tail(&dp->list_node, &ovs_net->dps);
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
	rtnl_unlock();

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_datapath_multicast_group.id, info->nlhdr,
		    GFP_KERNEL);
	return 0;

err_destroy_local_port:
	ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
err_destroy_percpu:
	free_percpu(dp->stats_percpu);
err_destroy_table:
	ovs_flow_tbl_destroy(genl_dereference(dp->table));
err_free_dp:
1318
	release_net(ovs_dp_get_net(dp));
1319 1320 1321 1322 1323 1324 1325
	kfree(dp);
err_unlock_rtnl:
	rtnl_unlock();
err:
	return err;
}

1326 1327
/* Called with genl_mutex. */
static void __dp_destroy(struct datapath *dp)
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
{
	struct vport *vport, *next_vport;

	rtnl_lock();
	list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
		if (vport->port_no != OVSP_LOCAL)
			ovs_dp_detach_port(vport);

	list_del(&dp->list_node);
	ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));

	/* rtnl_unlock() will wait until all the references to devices that
	 * are pending unregistration have been dropped.  We do it here to
	 * ensure that any internal devices (which contain DP pointers) are
	 * fully destroyed before freeing the datapath.
	 */
	rtnl_unlock();

	call_rcu(&dp->rcu, destroy_dp_rcu);
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
}

static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *reply;
	struct datapath *dp;
	int err;

	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
	err = PTR_ERR(dp);
	if (IS_ERR(dp))
		return err;

	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
				      info->snd_seq, OVS_DP_CMD_DEL);
	err = PTR_ERR(reply);
	if (IS_ERR(reply))
		return err;

	__dp_destroy(dp);
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_datapath_multicast_group.id, info->nlhdr,
		    GFP_KERNEL);

	return 0;
}

static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *reply;
	struct datapath *dp;
	int err;

1381
	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1382 1383 1384 1385 1386 1387 1388
	if (IS_ERR(dp))
		return PTR_ERR(dp);

	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
				      info->snd_seq, OVS_DP_CMD_NEW);
	if (IS_ERR(reply)) {
		err = PTR_ERR(reply);
1389
		netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
				ovs_dp_datapath_multicast_group.id, err);
		return 0;
	}

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_datapath_multicast_group.id, info->nlhdr,
		    GFP_KERNEL);

	return 0;
}

static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *reply;
	struct datapath *dp;

1406
	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
	if (IS_ERR(dp))
		return PTR_ERR(dp);

	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
				      info->snd_seq, OVS_DP_CMD_NEW);
	if (IS_ERR(reply))
		return PTR_ERR(reply);

	return genlmsg_reply(reply, info);
}

static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
1420
	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1421 1422 1423 1424
	struct datapath *dp;
	int skip = cb->args[0];
	int i = 0;

1425
	list_for_each_entry(dp, &ovs_net->dps, list_node) {
1426 1427
		if (i >= skip &&
		    ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
					 OVS_DP_CMD_NEW) < 0)
			break;
		i++;
	}

	cb->args[0] = i;

	return skb->len;
}

static struct genl_ops dp_datapath_genl_ops[] = {
	{ .cmd = OVS_DP_CMD_NEW,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = datapath_policy,
	  .doit = ovs_dp_cmd_new
	},
	{ .cmd = OVS_DP_CMD_DEL,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = datapath_policy,
	  .doit = ovs_dp_cmd_del
	},
	{ .cmd = OVS_DP_CMD_GET,
	  .flags = 0,		    /* OK for unprivileged users. */
	  .policy = datapath_policy,
	  .doit = ovs_dp_cmd_get,
	  .dumpit = ovs_dp_cmd_dump
	},
	{ .cmd = OVS_DP_CMD_SET,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = datapath_policy,
	  .doit = ovs_dp_cmd_set,
	},
};

static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
	[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
	[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
	[OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
	[OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
	[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
	[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
};

static struct genl_family dp_vport_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
	.name = OVS_VPORT_FAMILY,
	.version = OVS_VPORT_VERSION,
1477 1478
	.maxattr = OVS_VPORT_ATTR_MAX,
	.netnsok = true
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
};

struct genl_multicast_group ovs_dp_vport_multicast_group = {
	.name = OVS_VPORT_MCGROUP
};

/* Called with RTNL lock or RCU read lock. */
static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
				   u32 pid, u32 seq, u32 flags, u8 cmd)
{
	struct ovs_header *ovs_header;
	struct ovs_vport_stats vport_stats;
	int err;

	ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
				 flags, cmd);
	if (!ovs_header)
		return -EMSGSIZE;

	ovs_header->dp_ifindex = get_dpifindex(vport->dp);

1500 1501 1502 1503 1504
	if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
	    nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
	    nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
	    nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid))
		goto nla_put_failure;
1505 1506

	ovs_vport_get_stats(vport, &vport_stats);
1507 1508 1509
	if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
		    &vport_stats))
		goto nla_put_failure;
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543

	err = ovs_vport_get_options(vport, skb);
	if (err == -EMSGSIZE)
		goto error;

	return genlmsg_end(skb, ovs_header);

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

/* Called with RTNL lock or RCU read lock. */
struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
					 u32 seq, u8 cmd)
{
	struct sk_buff *skb;
	int retval;

	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!skb)
		return ERR_PTR(-ENOMEM);

	retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
	if (retval < 0) {
		kfree_skb(skb);
		return ERR_PTR(retval);
	}
	return skb;
}

/* Called with RTNL lock or RCU read lock. */
1544 1545
static struct vport *lookup_vport(struct net *net,
				  struct ovs_header *ovs_header,
1546 1547 1548 1549 1550 1551
				  struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
{
	struct datapath *dp;
	struct vport *vport;

	if (a[OVS_VPORT_ATTR_NAME]) {
1552
		vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1553 1554
		if (!vport)
			return ERR_PTR(-ENODEV);
1555 1556 1557
		if (ovs_header->dp_ifindex &&
		    ovs_header->dp_ifindex != get_dpifindex(vport->dp))
			return ERR_PTR(-ENODEV);
1558 1559 1560 1561 1562 1563 1564
		return vport;
	} else if (a[OVS_VPORT_ATTR_PORT_NO]) {
		u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);

		if (port_no >= DP_MAX_PORTS)
			return ERR_PTR(-EFBIG);

1565
		dp = get_dp(net, ovs_header->dp_ifindex);
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
		if (!dp)
			return ERR_PTR(-ENODEV);

		vport = rcu_dereference_rtnl(dp->ports[port_no]);
		if (!vport)
			return ERR_PTR(-ENOENT);
		return vport;
	} else
		return ERR_PTR(-EINVAL);
}

static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
	struct vport_parms parms;
	struct sk_buff *reply;
	struct vport *vport;
	struct datapath *dp;
	u32 port_no;
	int err;

	err = -EINVAL;
	if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
	    !a[OVS_VPORT_ATTR_UPCALL_PID])
		goto exit;

	rtnl_lock();
1594
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657
	err = -ENODEV;
	if (!dp)
		goto exit_unlock;

	if (a[OVS_VPORT_ATTR_PORT_NO]) {
		port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);

		err = -EFBIG;
		if (port_no >= DP_MAX_PORTS)
			goto exit_unlock;

		vport = rtnl_dereference(dp->ports[port_no]);
		err = -EBUSY;
		if (vport)
			goto exit_unlock;
	} else {
		for (port_no = 1; ; port_no++) {
			if (port_no >= DP_MAX_PORTS) {
				err = -EFBIG;
				goto exit_unlock;
			}
			vport = rtnl_dereference(dp->ports[port_no]);
			if (!vport)
				break;
		}
	}

	parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
	parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
	parms.options = a[OVS_VPORT_ATTR_OPTIONS];
	parms.dp = dp;
	parms.port_no = port_no;
	parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);

	vport = new_vport(&parms);
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
		goto exit_unlock;

	reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
					 OVS_VPORT_CMD_NEW);
	if (IS_ERR(reply)) {
		err = PTR_ERR(reply);
		ovs_dp_detach_port(vport);
		goto exit_unlock;
	}
	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);

exit_unlock:
	rtnl_unlock();
exit:
	return err;
}

static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct sk_buff *reply;
	struct vport *vport;
	int err;

	rtnl_lock();
1658
	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
		goto exit_unlock;

	err = 0;
	if (a[OVS_VPORT_ATTR_TYPE] &&
	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
		err = -EINVAL;

	if (!err && a[OVS_VPORT_ATTR_OPTIONS])
		err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1670 1671 1672
	if (err)
		goto exit_unlock;
	if (a[OVS_VPORT_ATTR_UPCALL_PID])
1673 1674 1675 1676 1677
		vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);

	reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
					 OVS_VPORT_CMD_NEW);
	if (IS_ERR(reply)) {
1678
		netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1679 1680
				ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
		goto exit_unlock;
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
	}

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);

exit_unlock:
	rtnl_unlock();
	return err;
}

static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct sk_buff *reply;
	struct vport *vport;
	int err;

	rtnl_lock();
1699
	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
		goto exit_unlock;

	if (vport->port_no == OVSP_LOCAL) {
		err = -EINVAL;
		goto exit_unlock;
	}

	reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
					 OVS_VPORT_CMD_DEL);
	err = PTR_ERR(reply);
	if (IS_ERR(reply))
		goto exit_unlock;

	ovs_dp_detach_port(vport);

	genl_notify(reply, genl_info_net(info), info->snd_pid,
		    ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);

exit_unlock:
	rtnl_unlock();
	return err;
}

static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
	struct sk_buff *reply;
	struct vport *vport;
	int err;

	rcu_read_lock();
1734
	vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
		goto exit_unlock;

	reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
					 OVS_VPORT_CMD_NEW);
	err = PTR_ERR(reply);
	if (IS_ERR(reply))
		goto exit_unlock;

	rcu_read_unlock();

	return genlmsg_reply(reply, info);

exit_unlock:
	rcu_read_unlock();
	return err;
}

static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
	struct datapath *dp;
	u32 port_no;
	int retval;

1761
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
	if (!dp)
		return -ENODEV;

	rcu_read_lock();
	for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
		struct vport *vport;

		vport = rcu_dereference(dp->ports[port_no]);
		if (!vport)
			continue;

		if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
					    cb->nlh->nlmsg_seq, NLM_F_MULTI,
					    OVS_VPORT_CMD_NEW) < 0)
			break;
	}
	rcu_read_unlock();

	cb->args[0] = port_no;
	retval = skb->len;

	return retval;
}

static struct genl_ops dp_vport_genl_ops[] = {
	{ .cmd = OVS_VPORT_CMD_NEW,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = vport_policy,
	  .doit = ovs_vport_cmd_new
	},
	{ .cmd = OVS_VPORT_CMD_DEL,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = vport_policy,
	  .doit = ovs_vport_cmd_del
	},
	{ .cmd = OVS_VPORT_CMD_GET,
	  .flags = 0,		    /* OK for unprivileged users. */
	  .policy = vport_policy,
	  .doit = ovs_vport_cmd_get,
	  .dumpit = ovs_vport_cmd_dump
	},
	{ .cmd = OVS_VPORT_CMD_SET,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = vport_policy,
	  .doit = ovs_vport_cmd_set,
	},
};

struct genl_family_and_ops {
	struct genl_family *family;
	struct genl_ops *ops;
	int n_ops;
	struct genl_multicast_group *group;
};

static const struct genl_family_and_ops dp_genl_families[] = {
	{ &dp_datapath_genl_family,
	  dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
	  &ovs_dp_datapath_multicast_group },
	{ &dp_vport_genl_family,
	  dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
	  &ovs_dp_vport_multicast_group },
	{ &dp_flow_genl_family,
	  dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
	  &ovs_dp_flow_multicast_group },
	{ &dp_packet_genl_family,
	  dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
	  NULL },
};

static void dp_unregister_genl(int n_families)
{
	int i;

	for (i = 0; i < n_families