datapath.c 51.7 KB
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/*
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 * Copyright (c) 2007-2014 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 <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"
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#include "flow_table.h"
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#include "flow_netlink.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
60

61 62
int ovs_net_id __read_mostly;

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static struct genl_family dp_packet_genl_family;
static struct genl_family dp_flow_genl_family;
static struct genl_family dp_datapath_genl_family;

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

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

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static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
	.name = OVS_VPORT_MCGROUP,
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};

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/* Check if need to build a reply message.
 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
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static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
			    unsigned int group)
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{
	return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
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	       genl_has_listeners(family, genl_info_net(info)->genl_sock,
				  group);
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}

89
static void ovs_notify(struct genl_family *family,
90
		       struct sk_buff *skb, struct genl_info *info)
91
{
92
	genl_notify(family, skb, genl_info_net(info), info->snd_portid,
93
		    0, info->nlhdr, GFP_KERNEL);
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}

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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 datapath *dp, struct sk_buff *,
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			     const struct dp_upcall_info *);
138
static int queue_userspace_packet(struct datapath *dp, 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)
161
{
162
	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);

	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)];
}

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/* Called with ovs_mutex or RCU read lock. */
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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. */
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void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
242
{
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	const struct vport *p = OVS_CB(skb)->input_vport;
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	struct datapath *dp = p->dp;
	struct sw_flow *flow;
	struct dp_stats_percpu *stats;
	u64 *stats_counter;
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	u32 n_mask_hit;
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	stats = this_cpu_ptr(dp->stats_percpu);
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	/* Look up flow. */
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	flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
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	if (unlikely(!flow)) {
		struct dp_upcall_info upcall;
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		int error;
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		upcall.cmd = OVS_PACKET_CMD_MISS;
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		upcall.key = key;
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		upcall.userdata = NULL;
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		upcall.portid = ovs_vport_find_upcall_portid(p, skb);
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		error = ovs_dp_upcall(dp, skb, &upcall);
		if (unlikely(error))
			kfree_skb(skb);
		else
			consume_skb(skb);
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		stats_counter = &stats->n_missed;
		goto out;
	}

	OVS_CB(skb)->flow = flow;

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	ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb);
	ovs_execute_actions(dp, skb, key);
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	stats_counter = &stats->n_hit;
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out:
	/* Update datapath statistics. */
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	u64_stats_update_begin(&stats->syncp);
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	(*stats_counter)++;
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	stats->n_mask_hit += n_mask_hit;
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	u64_stats_update_end(&stats->syncp);
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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 err;

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

	if (!skb_is_gso(skb))
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		err = queue_userspace_packet(dp, skb, upcall_info);
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	else
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		err = queue_gso_packets(dp, 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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308
	u64_stats_update_begin(&stats->syncp);
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	stats->n_lost++;
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	u64_stats_update_end(&stats->syncp);
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	return err;
}

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static int queue_gso_packets(struct datapath *dp, 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, false);
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	if (IS_ERR(segs))
		return PTR_ERR(segs);
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	if (segs == NULL)
		return -EINVAL;
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	/* Queue all of the segments. */
	skb = segs;
	do {
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		err = queue_userspace_packet(dp, 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 */
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		+ nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
		  + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
		  + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
		  + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
		  + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
		  + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
		  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
		  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
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		  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_OAM */
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		  + nla_total_size(256)   /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
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		+ 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 */
}

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static size_t upcall_msg_size(const struct nlattr *userdata,
			      unsigned int hdrlen)
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{
	size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
392
		+ nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
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		+ nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */

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

	return size;
}

402
static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
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				  const struct dp_upcall_info *upcall_info)
{
	struct ovs_header *upcall;
	struct sk_buff *nskb = NULL;
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Li RongQing 已提交
407
	struct sk_buff *user_skb = NULL; /* to be queued to userspace */
408
	struct nlattr *nla;
409
	struct genl_info info = {
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		.dst_sk = ovs_dp_get_net(dp)->genl_sock,
411 412 413
		.snd_portid = upcall_info->portid,
	};
	size_t len;
414
	unsigned int hlen;
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	int err, dp_ifindex;

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

426
		nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
427
		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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	/* Complete checksum if needed */
	if (skb->ip_summed == CHECKSUM_PARTIAL &&
	    (err = skb_checksum_help(skb)))
		goto out;

	/* Older versions of OVS user space enforce alignment of the last
	 * Netlink attribute to NLA_ALIGNTO which would require extensive
	 * padding logic. Only perform zerocopy if padding is not required.
	 */
	if (dp->user_features & OVS_DP_F_UNALIGNED)
		hlen = skb_zerocopy_headlen(skb);
	else
		hlen = skb->len;

	len = upcall_msg_size(upcall_info->userdata, hlen);
454
	user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
455 456 457 458 459 460 461 462 463 464
	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);
465 466
	err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
	BUG_ON(err);
467 468 469
	nla_nest_end(user_skb, nla);

	if (upcall_info->userdata)
470 471 472
		__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
			  nla_len(upcall_info->userdata),
			  nla_data(upcall_info->userdata));
473

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	/* Only reserve room for attribute header, packet data is added
	 * in skb_zerocopy() */
	if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
		err = -ENOBUFS;
		goto out;
	}
	nla->nla_len = nla_attr_size(skb->len);
481

482 483 484
	err = skb_zerocopy(user_skb, skb, skb->len, hlen);
	if (err)
		goto out;
485

486 487 488 489 490 491 492 493
	/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
	if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
		size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;

		if (plen > 0)
			memset(skb_put(user_skb, plen), 0, plen);
	}

494
	((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
495

496
	err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
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Li RongQing 已提交
497
	user_skb = NULL;
498
out:
499 500
	if (err)
		skb_tx_error(skb);
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Li RongQing 已提交
501
	kfree_skb(user_skb);
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	kfree_skb(nskb);
	return err;
}

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;
515
	struct vport *input_vport;
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	int len;
	int err;

	err = -EINVAL;
	if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
521
	    !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);

531
	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. */
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Simon Horman 已提交
539
	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. */
545
	flow = ovs_flow_alloc();
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	err = PTR_ERR(flow);
	if (IS_ERR(flow))
		goto err_kfree_skb;

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	err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
					     &flow->key);
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	if (err)
		goto err_flow_free;

555
	acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
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	err = PTR_ERR(acts);
	if (IS_ERR(acts))
		goto err_flow_free;
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	err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
				   &flow->key, 0, &acts);
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	if (err)
		goto err_flow_free;
564

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	rcu_assign_pointer(flow->sf_acts, acts);

	OVS_CB(packet)->egress_tun_info = NULL;
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	OVS_CB(packet)->flow = flow;
	packet->priority = flow->key.phy.priority;
570
	packet->mark = flow->key.phy.skb_mark;
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	rcu_read_lock();
573
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
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	err = -ENODEV;
	if (!dp)
		goto err_unlock;

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	input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
	if (!input_vport)
		input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);

	if (!input_vport)
		goto err_unlock;

	OVS_CB(packet)->input_vport = input_vport;

587
	local_bh_disable();
588
	err = ovs_execute_actions(dp, packet, &flow->key);
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	local_bh_enable();
	rcu_read_unlock();

592
	ovs_flow_free(flow, false);
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	return err;

err_unlock:
	rcu_read_unlock();
err_flow_free:
598
	ovs_flow_free(flow, false);
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err_kfree_skb:
	kfree_skb(packet);
err:
	return err;
}

static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
606
	[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 },
};

611
static const struct genl_ops dp_packet_genl_ops[] = {
612 613 614 615 616 617 618
	{ .cmd = OVS_PACKET_CMD_EXECUTE,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = packet_policy,
	  .doit = ovs_packet_cmd_execute
	}
};

619 620 621 622 623 624 625 626 627 628 629 630
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,
	.maxattr = OVS_PACKET_ATTR_MAX,
	.netnsok = true,
	.parallel_ops = true,
	.ops = dp_packet_genl_ops,
	.n_ops = ARRAY_SIZE(dp_packet_genl_ops),
};

631 632
static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
			 struct ovs_dp_megaflow_stats *mega_stats)
633 634 635
{
	int i;

636 637
	memset(mega_stats, 0, sizeof(*mega_stats));

638
	stats->n_flows = ovs_flow_tbl_count(&dp->table);
639
	mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
640 641

	stats->n_hit = stats->n_missed = stats->n_lost = 0;
642

643 644 645 646 647 648 649 650
	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 {
651
			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
652
			local_stats = *percpu_stats;
653
		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
654 655 656 657

		stats->n_hit += local_stats.n_hit;
		stats->n_missed += local_stats.n_missed;
		stats->n_lost += local_stats.n_lost;
658
		mega_stats->n_mask_hit += local_stats.n_mask_hit;
659 660 661
	}
}

662 663 664 665
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 */
666
		+ nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
667 668 669 670 671 672
		+ 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 */
}

J
Jarno Rajahalme 已提交
673
/* Called with ovs_mutex or RCU read lock. */
674
static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
675
				  struct sk_buff *skb, u32 portid,
676 677 678
				  u32 seq, u32 flags, u8 cmd)
{
	const int skb_orig_len = skb->len;
679
	struct nlattr *start;
680
	struct ovs_flow_stats stats;
681 682
	__be16 tcp_flags;
	unsigned long used;
683 684 685 686
	struct ovs_header *ovs_header;
	struct nlattr *nla;
	int err;

687
	ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
688 689 690
	if (!ovs_header)
		return -EMSGSIZE;

691
	ovs_header->dp_ifindex = dp_ifindex;
692

693
	/* Fill flow key. */
694 695 696
	nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
	if (!nla)
		goto nla_put_failure;
697

698
	err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
699 700 701 702 703 704 705 706
	if (err)
		goto error;
	nla_nest_end(skb, nla);

	nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
	if (!nla)
		goto nla_put_failure;

707
	err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
708 709
	if (err)
		goto error;
710

711 712
	nla_nest_end(skb, nla);

713
	ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
714

715 716 717
	if (used &&
	    nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
		goto nla_put_failure;
718

719
	if (stats.n_packets &&
720
	    nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
721
		goto nla_put_failure;
722

723 724
	if ((u8)ntohs(tcp_flags) &&
	     nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
725
		goto nla_put_failure;
726 727 728 729 730 731 732 733 734 735 736

	/* 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.
	 */
737 738
	start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
	if (start) {
739 740
		const struct sw_flow_actions *sf_acts;

741
		sf_acts = rcu_dereference_ovsl(flow->sf_acts);
742 743
		err = ovs_nla_put_actions(sf_acts->actions,
					  sf_acts->actions_len, skb);
744

745 746 747 748 749 750 751 752 753 754
		if (!err)
			nla_nest_end(skb, start);
		else {
			if (skb_orig_len)
				goto error;

			nla_nest_cancel(skb, start);
		}
	} else if (skb_orig_len)
		goto nla_put_failure;
755 756 757 758 759 760 761 762 763 764

	return genlmsg_end(skb, ovs_header);

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

765 766
/* May not be called with RCU read lock. */
static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
767 768
					       struct genl_info *info,
					       bool always)
769
{
770
	struct sk_buff *skb;
771

772
	if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
773 774
		return NULL;

775
	skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
776 777 778 779
	if (!skb)
		return ERR_PTR(-ENOMEM);

	return skb;
780 781
}

782 783 784 785 786
/* Called with ovs_mutex. */
static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
					       int dp_ifindex,
					       struct genl_info *info, u8 cmd,
					       bool always)
787 788 789 790
{
	struct sk_buff *skb;
	int retval;

791 792
	skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
				      always);
793
	if (IS_ERR_OR_NULL(skb))
794
		return skb;
795

796 797 798
	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
					info->snd_portid, info->snd_seq, 0,
					cmd);
799 800 801 802
	BUG_ON(retval < 0);
	return skb;
}

803
static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
804 805 806
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
807
	struct sw_flow *flow, *new_flow;
808
	struct sw_flow_mask mask;
809 810
	struct sk_buff *reply;
	struct datapath *dp;
811
	struct sw_flow_actions *acts;
812
	struct sw_flow_match match;
813 814
	int error;

815
	/* Must have key and actions. */
816 817 818
	error = -EINVAL;
	if (!a[OVS_FLOW_ATTR_KEY])
		goto error;
819 820
	if (!a[OVS_FLOW_ATTR_ACTIONS])
		goto error;
821

822 823 824 825 826 827 828 829 830 831 832
	/* Most of the time we need to allocate a new flow, do it before
	 * locking.
	 */
	new_flow = ovs_flow_alloc();
	if (IS_ERR(new_flow)) {
		error = PTR_ERR(new_flow);
		goto error;
	}

	/* Extract key. */
	ovs_match_init(&match, &new_flow->unmasked_key, &mask);
833
	error = ovs_nla_get_match(&match,
834
				  a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
835
	if (error)
836
		goto err_kfree_flow;
837

838
	ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
839

840
	/* Validate actions. */
841 842 843
	acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
	error = PTR_ERR(acts);
	if (IS_ERR(acts))
844
		goto err_kfree_flow;
845

846 847
	error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
				     0, &acts);
848 849
	if (error) {
		OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
850 851 852 853 854 855 856
		goto err_kfree_acts;
	}

	reply = ovs_flow_cmd_alloc_info(acts, info, false);
	if (IS_ERR(reply)) {
		error = PTR_ERR(reply);
		goto err_kfree_acts;
857 858
	}

859
	ovs_lock();
860
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
861 862
	if (unlikely(!dp)) {
		error = -ENODEV;
863
		goto err_unlock_ovs;
864
	}
865
	/* Check if this is a duplicate flow */
866 867 868
	flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
	if (likely(!flow)) {
		rcu_assign_pointer(new_flow->sf_acts, acts);
869 870

		/* Put flow in bucket. */
871 872
		error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
		if (unlikely(error)) {
873
			acts = NULL;
874 875 876 877 878 879 880 881 882 883
			goto err_unlock_ovs;
		}

		if (unlikely(reply)) {
			error = ovs_flow_cmd_fill_info(new_flow,
						       ovs_header->dp_ifindex,
						       reply, info->snd_portid,
						       info->snd_seq, 0,
						       OVS_FLOW_CMD_NEW);
			BUG_ON(error < 0);
884
		}
885
		ovs_unlock();
886
	} else {
887 888
		struct sw_flow_actions *old_acts;

889 890 891 892 893 894
		/* 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.
		 */
895 896 897
		if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
							 | NLM_F_EXCL))) {
			error = -EEXIST;
898
			goto err_unlock_ovs;
899
		}
900
		/* The unmasked key has to be the same for flow updates. */
901
		if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
902 903 904 905 906
			flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
			if (!flow) {
				error = -ENOENT;
				goto err_unlock_ovs;
			}
907
		}
908 909 910 911
		/* Update actions. */
		old_acts = ovsl_dereference(flow->sf_acts);
		rcu_assign_pointer(flow->sf_acts, acts);

912 913 914 915 916 917 918 919 920
		if (unlikely(reply)) {
			error = ovs_flow_cmd_fill_info(flow,
						       ovs_header->dp_ifindex,
						       reply, info->snd_portid,
						       info->snd_seq, 0,
						       OVS_FLOW_CMD_NEW);
			BUG_ON(error < 0);
		}
		ovs_unlock();
921

922 923
		ovs_nla_free_flow_actions(old_acts);
		ovs_flow_free(new_flow, false);
924
	}
925 926 927

	if (reply)
		ovs_notify(&dp_flow_genl_family, reply, info);
928 929 930 931
	return 0;

err_unlock_ovs:
	ovs_unlock();
932 933
	kfree_skb(reply);
err_kfree_acts:
934
	kfree(acts);
935 936
err_kfree_flow:
	ovs_flow_free(new_flow, false);
937 938 939
error:
	return error;
}
940

941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
						const struct sw_flow_key *key,
						const struct sw_flow_mask *mask)
{
	struct sw_flow_actions *acts;
	struct sw_flow_key masked_key;
	int error;

	acts = ovs_nla_alloc_flow_actions(nla_len(a));
	if (IS_ERR(acts))
		return acts;

	ovs_flow_mask_key(&masked_key, key, mask);
	error = ovs_nla_copy_actions(a, &masked_key, 0, &acts);
	if (error) {
		OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
		kfree(acts);
		return ERR_PTR(error);
	}

	return acts;
}

964 965 966 967
static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **a = info->attrs;
	struct ovs_header *ovs_header = info->userhdr;
968
	struct sw_flow_key key;
969 970 971 972
	struct sw_flow *flow;
	struct sw_flow_mask mask;
	struct sk_buff *reply = NULL;
	struct datapath *dp;
973
	struct sw_flow_actions *old_acts = NULL, *acts = NULL;
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
	struct sw_flow_match match;
	int error;

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

	ovs_match_init(&match, &key, &mask);
	error = ovs_nla_get_match(&match,
				  a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
	if (error)
		goto error;

	/* Validate actions. */
	if (a[OVS_FLOW_ATTR_ACTIONS]) {
990 991 992
		acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask);
		if (IS_ERR(acts)) {
			error = PTR_ERR(acts);
993
			goto error;
994 995 996 997 998 999 1000 1001 1002
		}
	}

	/* Can allocate before locking if have acts. */
	if (acts) {
		reply = ovs_flow_cmd_alloc_info(acts, info, false);
		if (IS_ERR(reply)) {
			error = PTR_ERR(reply);
			goto err_kfree_acts;
1003
		}
1004
	}
1005

1006 1007
	ovs_lock();
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1008 1009
	if (unlikely(!dp)) {
		error = -ENODEV;
1010
		goto err_unlock_ovs;
1011
	}
1012
	/* Check that the flow exists. */
1013
	flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1014 1015
	if (unlikely(!flow)) {
		error = -ENOENT;
1016
		goto err_unlock_ovs;
1017
	}
1018

1019
	/* Update actions, if present. */
1020
	if (likely(acts)) {
1021 1022
		old_acts = ovsl_dereference(flow->sf_acts);
		rcu_assign_pointer(flow->sf_acts, acts);
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039

		if (unlikely(reply)) {
			error = ovs_flow_cmd_fill_info(flow,
						       ovs_header->dp_ifindex,
						       reply, info->snd_portid,
						       info->snd_seq, 0,
						       OVS_FLOW_CMD_NEW);
			BUG_ON(error < 0);
		}
	} else {
		/* Could not alloc without acts before locking. */
		reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
						info, OVS_FLOW_CMD_NEW, false);
		if (unlikely(IS_ERR(reply))) {
			error = PTR_ERR(reply);
			goto err_unlock_ovs;
		}
1040
	}
1041 1042 1043 1044

	/* Clear stats. */
	if (a[OVS_FLOW_ATTR_CLEAR])
		ovs_flow_stats_clear(flow);
1045
	ovs_unlock();
1046

1047 1048 1049 1050
	if (reply)
		ovs_notify(&dp_flow_genl_family, reply, info);
	if (old_acts)
		ovs_nla_free_flow_actions(old_acts);
1051

1052 1053
	return 0;

1054 1055
err_unlock_ovs:
	ovs_unlock();
1056 1057
	kfree_skb(reply);
err_kfree_acts:
1058
	kfree(acts);
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
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;
1071
	struct sw_flow_match match;
1072 1073
	int err;

1074 1075
	if (!a[OVS_FLOW_ATTR_KEY]) {
		OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1076
		return -EINVAL;
1077 1078 1079
	}

	ovs_match_init(&match, &key, NULL);
1080
	err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1081 1082 1083
	if (err)
		return err;

1084
	ovs_lock();
1085
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1086 1087 1088 1089
	if (!dp) {
		err = -ENODEV;
		goto unlock;
	}
1090

1091 1092
	flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
	if (!flow) {
1093 1094 1095
		err = -ENOENT;
		goto unlock;
	}
1096

1097 1098
	reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
					OVS_FLOW_CMD_NEW, true);
1099 1100 1101 1102
	if (IS_ERR(reply)) {
		err = PTR_ERR(reply);
		goto unlock;
	}
1103

1104
	ovs_unlock();
1105
	return genlmsg_reply(reply, info);
1106 1107 1108
unlock:
	ovs_unlock();
	return err;
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
}

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;
1119
	struct sw_flow_match match;
1120 1121
	int err;

1122 1123 1124 1125 1126 1127 1128
	if (likely(a[OVS_FLOW_ATTR_KEY])) {
		ovs_match_init(&match, &key, NULL);
		err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
		if (unlikely(err))
			return err;
	}

1129
	ovs_lock();
1130
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1131
	if (unlikely(!dp)) {
1132 1133 1134
		err = -ENODEV;
		goto unlock;
	}
1135

1136
	if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1137
		err = ovs_flow_tbl_flush(&dp->table);
1138 1139
		goto unlock;
	}
1140

1141 1142
	flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
	if (unlikely(!flow)) {
1143 1144 1145
		err = -ENOENT;
		goto unlock;
	}
1146

1147
	ovs_flow_tbl_remove(&dp->table, flow);
1148
	ovs_unlock();
1149

1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
	reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
					info, false);
	if (likely(reply)) {
		if (likely(!IS_ERR(reply))) {
			rcu_read_lock();	/*To keep RCU checker happy. */
			err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
						     reply, info->snd_portid,
						     info->snd_seq, 0,
						     OVS_FLOW_CMD_DEL);
			rcu_read_unlock();
			BUG_ON(err < 0);

			ovs_notify(&dp_flow_genl_family, reply, info);
		} else {
			netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
		}
1166
	}
1167

1168
	ovs_flow_free(flow, true);
1169
	return 0;
1170 1171 1172
unlock:
	ovs_unlock();
	return err;
1173 1174 1175 1176 1177
}

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));
1178
	struct table_instance *ti;
1179 1180
	struct datapath *dp;

1181
	rcu_read_lock();
1182
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1183
	if (!dp) {
1184
		rcu_read_unlock();
1185
		return -ENODEV;
1186
	}
1187

1188
	ti = rcu_dereference(dp->table.ti);
1189 1190 1191 1192 1193 1194
	for (;;) {
		struct sw_flow *flow;
		u32 bucket, obj;

		bucket = cb->args[0];
		obj = cb->args[1];
1195
		flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1196 1197 1198
		if (!flow)
			break;

1199
		if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1200
					   NETLINK_CB(cb->skb).portid,
1201 1202 1203 1204 1205 1206 1207
					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
					   OVS_FLOW_CMD_NEW) < 0)
			break;

		cb->args[0] = bucket;
		cb->args[1] = obj;
	}
1208
	rcu_read_unlock();
1209 1210 1211
	return skb->len;
}

1212 1213 1214 1215 1216 1217
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 },
};

1218
static const struct genl_ops dp_flow_genl_ops[] = {
1219 1220 1221
	{ .cmd = OVS_FLOW_CMD_NEW,
	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
	  .policy = flow_policy,
1222
	  .doit = ovs_flow_cmd_new
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
	},
	{ .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,
1238
	  .doit = ovs_flow_cmd_set,
1239 1240 1241
	},
};

1242
static struct genl_family dp_flow_genl_family = {
1243 1244
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
1245 1246 1247
	.name = OVS_FLOW_FAMILY,
	.version = OVS_FLOW_VERSION,
	.maxattr = OVS_FLOW_ATTR_MAX,
1248 1249
	.netnsok = true,
	.parallel_ops = true,
1250 1251 1252 1253
	.ops = dp_flow_genl_ops,
	.n_ops = ARRAY_SIZE(dp_flow_genl_ops),
	.mcgrps = &ovs_dp_flow_multicast_group,
	.n_mcgrps = 1,
1254 1255
};

1256 1257 1258 1259 1260 1261
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));
1262
	msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1263
	msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1264 1265 1266 1267

	return msgsize;
}

J
Jarno Rajahalme 已提交
1268
/* Called with ovs_mutex or RCU read lock. */
1269
static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1270
				u32 portid, u32 seq, u32 flags, u8 cmd)
1271 1272 1273
{
	struct ovs_header *ovs_header;
	struct ovs_dp_stats dp_stats;
1274
	struct ovs_dp_megaflow_stats dp_megaflow_stats;
1275 1276
	int err;

1277
	ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
				   flags, cmd);
	if (!ovs_header)
		goto error;

	ovs_header->dp_ifindex = get_dpifindex(dp);

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

1288 1289 1290 1291 1292 1293 1294 1295
	get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
	if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
			&dp_stats))
		goto nla_put_failure;

	if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
			sizeof(struct ovs_dp_megaflow_stats),
			&dp_megaflow_stats))
1296
		goto nla_put_failure;
1297

1298 1299 1300
	if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
		goto nla_put_failure;

1301 1302 1303 1304 1305 1306 1307 1308
	return genlmsg_end(skb, ovs_header);

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

1309
static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1310
{
1311
	return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1312 1313
}

J
Jarno Rajahalme 已提交
1314
/* Called with rcu_read_lock or ovs_mutex. */
1315 1316
static struct datapath *lookup_datapath(struct net *net,
					struct ovs_header *ovs_header,
1317 1318 1319 1320 1321
					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
{
	struct datapath *dp;

	if (!a[OVS_DP_ATTR_NAME])
1322
		dp = get_dp(net, ovs_header->dp_ifindex);
1323 1324 1325
	else {
		struct vport *vport;

1326
		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1327 1328 1329 1330 1331
		dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
	}
	return dp ? dp : ERR_PTR(-ENODEV);
}

1332 1333 1334 1335 1336
static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
{
	struct datapath *dp;

	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1337
	if (IS_ERR(dp))
1338 1339 1340 1341 1342 1343
		return;

	WARN(dp->user_features, "Dropping previously announced user features\n");
	dp->user_features = 0;
}

1344 1345 1346 1347 1348 1349
static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
{
	if (a[OVS_DP_ATTR_USER_FEATURES])
		dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
}

1350 1351 1352 1353 1354 1355 1356
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;
1357
	struct ovs_net *ovs_net;
1358
	int err, i;
1359 1360 1361 1362 1363

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

1364 1365 1366
	reply = ovs_dp_cmd_alloc_info(info);
	if (!reply)
		return -ENOMEM;
1367 1368 1369 1370

	err = -ENOMEM;
	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
	if (dp == NULL)
1371
		goto err_free_reply;
1372 1373

	ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1374 1375

	/* Allocate table. */
1376 1377
	err = ovs_flow_tbl_init(&dp->table);
	if (err)
1378 1379
		goto err_free_dp;

1380
	dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1381 1382 1383 1384 1385
	if (!dp->stats_percpu) {
		err = -ENOMEM;
		goto err_destroy_table;
	}

1386
	dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1387
			    GFP_KERNEL);
1388 1389 1390 1391 1392 1393 1394 1395
	if (!dp->ports) {
		err = -ENOMEM;
		goto err_destroy_percpu;
	}

	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
		INIT_HLIST_HEAD(&dp->ports[i]);

1396 1397 1398 1399 1400 1401
	/* 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;
1402
	parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1403

1404 1405
	ovs_dp_change(dp, a);

1406 1407 1408
	/* So far only local changes have been made, now need the lock. */
	ovs_lock();

1409 1410 1411 1412 1413 1414
	vport = new_vport(&parms);
	if (IS_ERR(vport)) {
		err = PTR_ERR(vport);
		if (err == -EBUSY)
			err = -EEXIST;

1415 1416 1417 1418 1419 1420 1421 1422 1423
		if (err == -EEXIST) {
			/* An outdated user space instance that does not understand
			 * the concept of user_features has attempted to create a new
			 * datapath and is likely to reuse it. Drop all user features.
			 */
			if (info->genlhdr->version < OVS_DP_VER_FEATURES)
				ovs_dp_reset_user_features(skb, info);
		}

1424
		goto err_destroy_ports_array;
1425 1426
	}

1427 1428 1429
	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
				   info->snd_seq, 0, OVS_DP_CMD_NEW);
	BUG_ON(err < 0);
1430

1431
	ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1432
	list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1433 1434

	ovs_unlock();
1435

1436
	ovs_notify(&dp_datapath_genl_family, reply, info);
1437 1438
	return 0;

1439
err_destroy_ports_array:
1440
	ovs_unlock();
1441
	kfree(dp->ports);
1442 1443 1444
err_destroy_percpu:
	free_percpu(dp->stats_percpu);
err_destroy_table:
1445
	ovs_flow_tbl_destroy(&dp->table, false);
1446
err_free_dp:
1447
	release_net(ovs_dp_get_net(dp));
1448
	kfree(dp);
1449 1450
err_free_reply:
	kfree_skb(reply);
1451 1452 1453 1454
err:
	return err;
}

1455
/* Called with ovs_mutex. */
1456
static void __dp_destroy(struct datapath *dp)
1457
{
1458
	int i;
1459

1460 1461
	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
		struct vport *vport;
1462
		struct hlist_node *n;
1463

1464
		hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1465 1466 1467
			if (vport->port_no != OVSP_LOCAL)
				ovs_dp_detach_port(vport);
	}
1468

1469
	list_del_rcu(&dp->list_node);
1470

1471
	/* OVSP_LOCAL is datapath internal port. We need to make sure that
1472
	 * all ports in datapath are destroyed first before freeing datapath.
1473
	 */
1474
	ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1475

1476 1477 1478
	/* RCU destroy the flow table */
	ovs_flow_tbl_destroy(&dp->table, true);

1479
	call_rcu(&dp->rcu, destroy_dp_rcu);
1480 1481 1482 1483 1484 1485 1486 1487
}

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

1488 1489 1490 1491
	reply = ovs_dp_cmd_alloc_info(info);
	if (!reply)
		return -ENOMEM;

1492
	ovs_lock();
1493 1494 1495
	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
	err = PTR_ERR(dp);
	if (IS_ERR(dp))
1496
		goto err_unlock_free;
1497

1498 1499 1500
	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
				   info->snd_seq, 0, OVS_DP_CMD_DEL);
	BUG_ON(err < 0);
1501 1502

	__dp_destroy(dp);
1503
	ovs_unlock();
1504

1505
	ovs_notify(&dp_datapath_genl_family, reply, info);
1506 1507

	return 0;
1508 1509

err_unlock_free:
1510
	ovs_unlock();
1511
	kfree_skb(reply);
1512
	return err;
1513 1514 1515 1516 1517 1518 1519 1520
}

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

1521 1522 1523 1524
	reply = ovs_dp_cmd_alloc_info(info);
	if (!reply)
		return -ENOMEM;

1525
	ovs_lock();
1526
	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1527
	err = PTR_ERR(dp);
1528
	if (IS_ERR(dp))
1529
		goto err_unlock_free;
1530

1531 1532
	ovs_dp_change(dp, info->attrs);

1533 1534 1535
	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
				   info->snd_seq, 0, OVS_DP_CMD_NEW);
	BUG_ON(err < 0);
1536

1537
	ovs_unlock();
1538
	ovs_notify(&dp_datapath_genl_family, reply, info);
1539 1540

	return 0;
1541 1542

err_unlock_free:
1543
	ovs_unlock();
1544
	kfree_skb(reply);
1545
	return err;
1546 1547 1548 1549 1550 1551
}

static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *reply;
	struct datapath *dp;
1552
	int err;
1553

1554 1555 1556 1557 1558
	reply = ovs_dp_cmd_alloc_info(info);
	if (!reply)
		return -ENOMEM;

	rcu_read_lock();
1559
	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1560 1561
	if (IS_ERR(dp)) {
		err = PTR_ERR(dp);
1562
		goto err_unlock_free;
1563
	}
1564 1565 1566 1567
	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
				   info->snd_seq, 0, OVS_DP_CMD_NEW);
	BUG_ON(err < 0);
	rcu_read_unlock();
1568 1569

	return genlmsg_reply(reply, info);
1570

1571 1572 1573
err_unlock_free:
	rcu_read_unlock();
	kfree_skb(reply);
1574
	return err;
1575 1576 1577 1578
}

static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
1579
	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1580 1581 1582 1583
	struct datapath *dp;
	int skip = cb->args[0];
	int i = 0;

1584 1585
	rcu_read_lock();
	list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1586
		if (i >= skip &&
1587
		    ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1588 1589 1590 1591 1592
					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
					 OVS_DP_CMD_NEW) < 0)
			break;
		i++;
	}
1593
	rcu_read_unlock();
1594 1595 1596 1597 1598 1599

	cb->args[0] = i;

	return skb->len;
}

1600 1601 1602 1603 1604 1605
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 },
	[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
};

1606
static const struct genl_ops dp_datapath_genl_ops[] = {
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
	{ .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,
	},
};

1630
static struct genl_family dp_datapath_genl_family = {
1631 1632
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
1633 1634 1635
	.name = OVS_DATAPATH_FAMILY,
	.version = OVS_DATAPATH_VERSION,
	.maxattr = OVS_DP_ATTR_MAX,
1636 1637
	.netnsok = true,
	.parallel_ops = true,
1638 1639 1640 1641
	.ops = dp_datapath_genl_ops,
	.n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
	.mcgrps = &ovs_dp_datapath_multicast_group,
	.n_mcgrps = 1,
1642 1643
};

1644
/* Called with ovs_mutex or RCU read lock. */
1645
static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1646
				   u32 portid, u32 seq, u32 flags, u8 cmd)
1647 1648 1649 1650 1651
{
	struct ovs_header *ovs_header;
	struct ovs_vport_stats vport_stats;
	int err;

1652
	ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1653 1654 1655 1656 1657 1658
				 flags, cmd);
	if (!ovs_header)
		return -EMSGSIZE;

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

1659 1660
	if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
	    nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1661 1662
	    nla_put_string(skb, OVS_VPORT_ATTR_NAME,
			   vport->ops->get_name(vport)))
1663
		goto nla_put_failure;
1664 1665

	ovs_vport_get_stats(vport, &vport_stats);
1666 1667 1668
	if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
		    &vport_stats))
		goto nla_put_failure;
1669

1670 1671 1672
	if (ovs_vport_get_upcall_portids(vport, skb))
		goto nla_put_failure;

1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
	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;
}

1686 1687 1688 1689 1690 1691
static struct sk_buff *ovs_vport_cmd_alloc_info(void)
{
	return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
}

/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1692
struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1693 1694 1695 1696 1697 1698 1699 1700 1701
					 u32 seq, u8 cmd)
{
	struct sk_buff *skb;
	int retval;

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

1702
	retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1703 1704
	BUG_ON(retval < 0);

1705 1706 1707
	return skb;
}

1708
/* Called with ovs_mutex or RCU read lock. */
1709 1710
static struct vport *lookup_vport(struct net *net,
				  struct ovs_header *ovs_header,
1711 1712 1713 1714 1715 1716
				  struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
{
	struct datapath *dp;
	struct vport *vport;

	if (a[OVS_VPORT_ATTR_NAME]) {
1717
		vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1718 1719
		if (!vport)
			return ERR_PTR(-ENODEV);
1720 1721 1722
		if (ovs_header->dp_ifindex &&
		    ovs_header->dp_ifindex != get_dpifindex(vport->dp))
			return ERR_PTR(-ENODEV);
1723 1724 1725 1726 1727 1728 1729
		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);

1730
		dp = get_dp(net, ovs_header->dp_ifindex);
1731 1732 1733
		if (!dp)
			return ERR_PTR(-ENODEV);

1734
		vport = ovs_vport_ovsl_rcu(dp, port_no);
1735
		if (!vport)
1736
			return ERR_PTR(-ENODEV);
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
		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;

	if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
	    !a[OVS_VPORT_ATTR_UPCALL_PID])
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
		return -EINVAL;

	port_no = a[OVS_VPORT_ATTR_PORT_NO]
		? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
	if (port_no >= DP_MAX_PORTS)
		return -EFBIG;

	reply = ovs_vport_cmd_alloc_info();
	if (!reply)
		return -ENOMEM;
1765

1766
	ovs_lock();
1767
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1768 1769
	err = -ENODEV;
	if (!dp)
1770
		goto exit_unlock_free;
1771

1772
	if (port_no) {
1773
		vport = ovs_vport_ovsl(dp, port_no);
1774 1775
		err = -EBUSY;
		if (vport)
1776
			goto exit_unlock_free;
1777 1778 1779 1780
	} else {
		for (port_no = 1; ; port_no++) {
			if (port_no >= DP_MAX_PORTS) {
				err = -EFBIG;
1781
				goto exit_unlock_free;
1782
			}
1783
			vport = ovs_vport_ovsl(dp, port_no);
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
			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;
1794
	parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1795 1796 1797 1798

	vport = new_vport(&parms);
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
1799
		goto exit_unlock_free;
1800

1801 1802 1803 1804
	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
	BUG_ON(err < 0);
	ovs_unlock();
1805

1806
	ovs_notify(&dp_vport_genl_family, reply, info);
1807
	return 0;
1808

1809
exit_unlock_free:
1810
	ovs_unlock();
1811
	kfree_skb(reply);
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
	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;

1822 1823 1824 1825
	reply = ovs_vport_cmd_alloc_info();
	if (!reply)
		return -ENOMEM;

1826
	ovs_lock();
1827
	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1828 1829
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
1830
		goto exit_unlock_free;
1831 1832

	if (a[OVS_VPORT_ATTR_TYPE] &&
1833
	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1834
		err = -EINVAL;
1835
		goto exit_unlock_free;
1836 1837
	}

1838
	if (a[OVS_VPORT_ATTR_OPTIONS]) {
1839
		err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1840
		if (err)
1841
			goto exit_unlock_free;
1842
	}
1843

1844 1845 1846 1847 1848 1849 1850 1851

	if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
		struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];

		err = ovs_vport_set_upcall_portids(vport, ids);
		if (err)
			goto exit_unlock_free;
	}
1852

1853 1854 1855
	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
	BUG_ON(err < 0);
1856

1857
	ovs_unlock();
1858
	ovs_notify(&dp_vport_genl_family, reply, info);
1859
	return 0;
1860

1861
exit_unlock_free:
1862
	ovs_unlock();
1863
	kfree_skb(reply);
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
	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;

1874 1875 1876 1877
	reply = ovs_vport_cmd_alloc_info();
	if (!reply)
		return -ENOMEM;

1878
	ovs_lock();
1879
	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1880 1881
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
1882
		goto exit_unlock_free;
1883 1884 1885

	if (vport->port_no == OVSP_LOCAL) {
		err = -EINVAL;
1886
		goto exit_unlock_free;
1887 1888
	}

1889 1890 1891
	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
				      info->snd_seq, 0, OVS_VPORT_CMD_DEL);
	BUG_ON(err < 0);
1892
	ovs_dp_detach_port(vport);
1893
	ovs_unlock();
1894

1895
	ovs_notify(&dp_vport_genl_family, reply, info);
1896
	return 0;
1897

1898
exit_unlock_free:
1899
	ovs_unlock();
1900
	kfree_skb(reply);
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	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;

1912 1913 1914 1915
	reply = ovs_vport_cmd_alloc_info();
	if (!reply)
		return -ENOMEM;

1916
	rcu_read_lock();
1917
	vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1918 1919
	err = PTR_ERR(vport);
	if (IS_ERR(vport))
1920 1921 1922 1923
		goto exit_unlock_free;
	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
	BUG_ON(err < 0);
1924 1925 1926 1927
	rcu_read_unlock();

	return genlmsg_reply(reply, info);

1928
exit_unlock_free:
1929
	rcu_read_unlock();
1930
	kfree_skb(reply);
1931 1932 1933 1934 1935 1936 1937
	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;
1938 1939
	int bucket = cb->args[0], skip = cb->args[1];
	int i, j = 0;
1940

J
Jarno Rajahalme 已提交
1941
	rcu_read_lock();
1942
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
J
Jarno Rajahalme 已提交
1943 1944
	if (!dp) {
		rcu_read_unlock();
1945
		return -ENODEV;
J
Jarno Rajahalme 已提交
1946
	}
1947
	for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1948
		struct vport *vport;
1949 1950

		j = 0;
1951
		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1952 1953
			if (j >= skip &&
			    ovs_vport_cmd_fill_info(vport, skb,
1954
						    NETLINK_CB(cb->skb).portid,
1955 1956 1957 1958 1959 1960 1961 1962
						    cb->nlh->nlmsg_seq,
						    NLM_F_MULTI,
						    OVS_VPORT_CMD_NEW) < 0)
				goto out;

			j++;
		}
		skip = 0;
1963
	}
1964
out:
1965 1966
	rcu_read_unlock();

1967 1968
	cb->args[0] = i;
	cb->args[1] = j;
1969

1970
	return skb->len;
1971 1972
}

1973 1974 1975 1976 1977 1978 1979 1980 1981
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 },
};

1982
static const struct genl_ops dp_vport_genl_ops[] = {
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
	{ .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,
	},
};

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
struct genl_family dp_vport_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = sizeof(struct ovs_header),
	.name = OVS_VPORT_FAMILY,
	.version = OVS_VPORT_VERSION,
	.maxattr = OVS_VPORT_ATTR_MAX,
	.netnsok = true,
	.parallel_ops = true,
	.ops = dp_vport_genl_ops,
	.n_ops = ARRAY_SIZE(dp_vport_genl_ops),
	.mcgrps = &ovs_dp_vport_multicast_group,
	.n_mcgrps = 1,
2018 2019
};

2020 2021 2022 2023 2024
static struct genl_family * const dp_genl_families[] = {
	&dp_datapath_genl_family,
	&dp_vport_genl_family,
	&dp_flow_genl_family,
	&dp_packet_genl_family,
2025 2026 2027 2028 2029 2030 2031
};

static void dp_unregister_genl(int n_families)
{
	int i;

	for (i = 0; i < n_families; i++)
2032
		genl_unregister_family(dp_genl_families[i]);
2033 2034 2035 2036 2037 2038 2039 2040 2041
}

static int dp_register_genl(void)
{
	int err;
	int i;

	for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {

2042
		err = genl_register_family(dp_genl_families[i]);
2043 2044 2045 2046 2047 2048 2049
		if (err)
			goto error;
	}

	return 0;

error:
2050
	dp_unregister_genl(i);
2051 2052 2053
	return err;
}

2054 2055 2056 2057 2058
static int __net_init ovs_init_net(struct net *net)
{
	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);

	INIT_LIST_HEAD(&ovs_net->dps);
2059
	INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2060 2061 2062 2063 2064 2065
	return 0;
}

static void __net_exit ovs_exit_net(struct net *net)
{
	struct datapath *dp, *dp_next;
2066
	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2067

2068
	ovs_lock();
2069 2070
	list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
		__dp_destroy(dp);
2071 2072 2073
	ovs_unlock();

	cancel_work_sync(&ovs_net->dp_notify_work);
2074 2075 2076 2077 2078 2079 2080 2081 2082
}

static struct pernet_operations ovs_net_ops = {
	.init = ovs_init_net,
	.exit = ovs_exit_net,
	.id   = &ovs_net_id,
	.size = sizeof(struct ovs_net),
};

2083 2084 2085 2086
static int __init dp_init(void)
{
	int err;

2087
	BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2088 2089 2090

	pr_info("Open vSwitch switching datapath\n");

2091
	err = action_fifos_init();
2092 2093 2094
	if (err)
		goto error;

2095 2096 2097 2098
	err = ovs_internal_dev_rtnl_link_register();
	if (err)
		goto error_action_fifos_exit;

2099 2100 2101 2102
	err = ovs_flow_init();
	if (err)
		goto error_unreg_rtnl_link;

2103 2104 2105 2106
	err = ovs_vport_init();
	if (err)
		goto error_flow_exit;

2107
	err = register_pernet_device(&ovs_net_ops);
2108 2109 2110
	if (err)
		goto error_vport_exit;

2111 2112 2113 2114
	err = register_netdevice_notifier(&ovs_dp_device_notifier);
	if (err)
		goto error_netns_exit;

2115 2116 2117 2118 2119 2120 2121 2122
	err = dp_register_genl();
	if (err < 0)
		goto error_unreg_notifier;

	return 0;

error_unreg_notifier:
	unregister_netdevice_notifier(&ovs_dp_device_notifier);
2123 2124
error_netns_exit:
	unregister_pernet_device(&ovs_net_ops);
2125 2126 2127 2128
error_vport_exit:
	ovs_vport_exit();
error_flow_exit:
	ovs_flow_exit();
2129 2130
error_unreg_rtnl_link:
	ovs_internal_dev_rtnl_link_unregister();
2131 2132
error_action_fifos_exit:
	action_fifos_exit();
2133 2134 2135 2136 2137 2138 2139 2140
error:
	return err;
}

static void dp_cleanup(void)
{
	dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
	unregister_netdevice_notifier(&ovs_dp_device_notifier);
2141 2142
	unregister_pernet_device(&ovs_net_ops);
	rcu_barrier();
2143 2144
	ovs_vport_exit();
	ovs_flow_exit();
2145
	ovs_internal_dev_rtnl_link_unregister();
2146
	action_fifos_exit();
2147 2148 2149 2150 2151 2152 2153
}

module_init(dp_init);
module_exit(dp_cleanup);

MODULE_DESCRIPTION("Open vSwitch switching datapath");
MODULE_LICENSE("GPL");