datapath.c 55.6 KB
Newer Older
1
/*
2
 * Copyright (c) 2007-2012 Nicira, Inc.
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
 *
 * 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>
47
#include <linux/lockdep.h>
48 49 50 51 52
#include <linux/openvswitch.h>
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
53 54
#include <net/net_namespace.h>
#include <net/netns/generic.h>
55 56 57 58

#include "datapath.h"
#include "flow.h"
#include "vport-internal_dev.h"
59
#include "vport-netdev.h"
60

61 62 63 64 65

#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);

66 67
int ovs_net_id __read_mostly;

68 69 70 71 72 73 74
static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
		       struct genl_multicast_group *grp)
{
	genl_notify(skb, genl_info_net(info), info->snd_portid,
		    grp->id, info->nlhdr, GFP_KERNEL);
}

75 76 77
/**
 * DOC: Locking:
 *
78 79 80 81
 * 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.
82 83 84 85 86 87
 *
 * 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.
88 89
 *
 * The RTNL lock nests inside ovs_mutex.
90 91
 */

92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
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

114
static struct vport *new_vport(const struct vport_parms *);
115
static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
116
			     const struct dp_upcall_info *);
117 118
static int queue_userspace_packet(struct net *, int dp_ifindex,
				  struct sk_buff *,
119 120
				  const struct dp_upcall_info *);

121
/* Must be called with rcu_read_lock or ovs_mutex. */
122
static struct datapath *get_dp(struct net *net, int dp_ifindex)
123 124 125 126 127
{
	struct datapath *dp = NULL;
	struct net_device *dev;

	rcu_read_lock();
128
	dev = dev_get_by_index_rcu(net, dp_ifindex);
129 130 131 132 133 134 135 136 137 138
	if (dev) {
		struct vport *vport = ovs_internal_dev_get_vport(dev);
		if (vport)
			dp = vport->dp;
	}
	rcu_read_unlock();

	return dp;
}

139
/* Must be called with rcu_read_lock or ovs_mutex. */
140 141
const char *ovs_dp_name(const struct datapath *dp)
{
142
	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 144 145 146 147 148 149 150 151 152
	return vport->ops->get_name(vport);
}

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

	rcu_read_lock();

153
	local = ovs_vport_rcu(dp, OVSP_LOCAL);
154
	if (local)
155
		ifindex = netdev_vport_priv(local)->dev->ifindex;
156 157 158 159 160 161 162 163 164 165 166 167 168 169
	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);
170
	release_net(ovs_dp_get_net(dp));
171
	kfree(dp->ports);
172 173 174
	kfree(dp);
}

175 176 177 178 179 180 181 182 183 184 185 186
static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
					    u16 port_no)
{
	return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
}

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

	head = vport_hash_bucket(dp, port_no);
187
	hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
188 189 190 191 192 193
		if (vport->port_no == port_no)
			return vport;
	}
	return NULL;
}

194
/* Called with ovs_mutex. */
195 196 197 198 199 200 201
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;
202
		struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
203

204
		hlist_add_head_rcu(&vport->dp_hash_node, head);
205 206 207 208 209 210
	}
	return vport;
}

void ovs_dp_detach_port(struct vport *p)
{
211
	ASSERT_OVSL();
212 213

	/* First drop references to device. */
214
	hlist_del_rcu(&p->dp_hash_node);
215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230

	/* 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;

231
	stats = this_cpu_ptr(dp->stats_percpu);
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247

	/* 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;
248
		upcall.portid = p->upcall_portid;
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272
		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,
273
	.maxattr = OVS_PACKET_ATTR_MAX,
274 275
	.netnsok = true,
	.parallel_ops = true,
276 277 278
};

int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
279
		  const struct dp_upcall_info *upcall_info)
280 281 282 283 284
{
	struct dp_stats_percpu *stats;
	int dp_ifindex;
	int err;

285
	if (upcall_info->portid == 0) {
286 287 288 289 290 291 292 293 294 295 296
		err = -ENOTCONN;
		goto err;
	}

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

	if (!skb_is_gso(skb))
297
		err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
298
	else
299
		err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
300 301 302 303 304 305
	if (err)
		goto err;

	return 0;

err:
306
	stats = this_cpu_ptr(dp->stats_percpu);
307 308 309 310 311 312 313 314

	u64_stats_update_begin(&stats->sync);
	stats->n_lost++;
	u64_stats_update_end(&stats->sync);

	return err;
}

315 316
static int queue_gso_packets(struct net *net, int dp_ifindex,
			     struct sk_buff *skb,
317 318
			     const struct dp_upcall_info *upcall_info)
{
319
	unsigned short gso_type = skb_shinfo(skb)->gso_type;
320 321 322 323 324
	struct dp_upcall_info later_info;
	struct sw_flow_key later_key;
	struct sk_buff *segs, *nskb;
	int err;

325
	segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
326 327
	if (IS_ERR(segs))
		return PTR_ERR(segs);
328 329 330 331

	/* Queue all of the segments. */
	skb = segs;
	do {
332
		err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
333 334 335
		if (err)
			break;

336
		if (skb == segs && gso_type & SKB_GSO_UDP) {
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361
			/* 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;
}

362 363 364
static size_t key_attr_size(void)
{
	return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
365 366 367 368 369 370 371 372
		+ 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 */
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398
		+ nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
		+ nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
		+ nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
		+ nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
		+ nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
		+ nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
		+ nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
		+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
}

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

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

	return size;
}

399 400
static int queue_userspace_packet(struct net *net, int dp_ifindex,
				  struct sk_buff *skb,
401 402 403 404 405 406 407 408 409 410 411 412 413
				  const struct dp_upcall_info *upcall_info)
{
	struct ovs_header *upcall;
	struct sk_buff *nskb = NULL;
	struct sk_buff *user_skb; /* to be queued to userspace */
	struct nlattr *nla;
	int err;

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

414
		nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
415
		if (!nskb)
416 417 418 419 420 421 422 423 424 425 426
			return -ENOMEM;

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

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

427
	user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
428 429 430 431 432 433 434 435 436 437 438 439 440 441
	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)
442 443 444
		__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
			  nla_len(upcall_info->userdata),
			  nla_data(upcall_info->userdata));
445 446 447 448 449

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

	skb_copy_and_csum_dev(skb, nla_data(nla));

450
	genlmsg_end(user_skb, upcall);
451
	err = genlmsg_unicast(net, user_skb, upcall_info->portid);
452 453 454 455 456 457

out:
	kfree_skb(nskb);
	return err;
}

458
/* Called with ovs_mutex. */
459
static int flush_flows(struct datapath *dp)
460 461 462 463
{
	struct flow_table *old_table;
	struct flow_table *new_table;

464
	old_table = ovsl_dereference(dp->table);
465 466 467 468 469 470 471 472 473 474
	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;
}

475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548
static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
{

	struct sw_flow_actions *acts;
	int new_acts_size;
	int req_size = NLA_ALIGN(attr_len);
	int next_offset = offsetof(struct sw_flow_actions, actions) +
					(*sfa)->actions_len;

	if (req_size <= (ksize(*sfa) - next_offset))
		goto out;

	new_acts_size = ksize(*sfa) * 2;

	if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
		if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
			return ERR_PTR(-EMSGSIZE);
		new_acts_size = MAX_ACTIONS_BUFSIZE;
	}

	acts = ovs_flow_actions_alloc(new_acts_size);
	if (IS_ERR(acts))
		return (void *)acts;

	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
	acts->actions_len = (*sfa)->actions_len;
	kfree(*sfa);
	*sfa = acts;

out:
	(*sfa)->actions_len += req_size;
	return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
}

static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
{
	struct nlattr *a;

	a = reserve_sfa_size(sfa, nla_attr_size(len));
	if (IS_ERR(a))
		return PTR_ERR(a);

	a->nla_type = attrtype;
	a->nla_len = nla_attr_size(len);

	if (data)
		memcpy(nla_data(a), data, len);
	memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));

	return 0;
}

static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
{
	int used = (*sfa)->actions_len;
	int err;

	err = add_action(sfa, attrtype, NULL, 0);
	if (err)
		return err;

	return used;
}

static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
{
	struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);

	a->nla_len = sfa->actions_len - st_offset;
}

static int validate_and_copy_actions(const struct nlattr *attr,
				     const struct sw_flow_key *key, int depth,
				     struct sw_flow_actions **sfa);
549

550 551 552
static int validate_and_copy_sample(const struct nlattr *attr,
				    const struct sw_flow_key *key, int depth,
				    struct sw_flow_actions **sfa)
553 554 555 556
{
	const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
	const struct nlattr *probability, *actions;
	const struct nlattr *a;
557
	int rem, start, err, st_acts;
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575

	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;
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595

	/* validation done, copy sample action. */
	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
	if (start < 0)
		return start;
	err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
	if (err)
		return err;
	st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
	if (st_acts < 0)
		return st_acts;

	err = validate_and_copy_actions(actions, key, depth + 1, sfa);
	if (err)
		return err;

	add_nested_action_end(*sfa, st_acts);
	add_nested_action_end(*sfa, start);

	return 0;
596 597
}

598 599 600
static int validate_tp_port(const struct sw_flow_key *flow_key)
{
	if (flow_key->eth.type == htons(ETH_P_IP)) {
601
		if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
602 603
			return 0;
	} else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
604
		if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
605 606 607 608 609 610
			return 0;
	}

	return -EINVAL;
}

611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
static int validate_and_copy_set_tun(const struct nlattr *attr,
				     struct sw_flow_actions **sfa)
{
	struct ovs_key_ipv4_tunnel tun_key;
	int err, start;

	err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &tun_key);
	if (err)
		return err;

	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
	if (start < 0)
		return start;

	err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &tun_key, sizeof(tun_key));
	add_nested_action_end(*sfa, start);

	return err;
}

631
static int validate_set(const struct nlattr *a,
632 633 634
			const struct sw_flow_key *flow_key,
			struct sw_flow_actions **sfa,
			bool *set_tun)
635 636 637 638 639 640 641 642 643
{
	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 ||
644 645
	   (ovs_key_lens[key_type] != nla_len(ovs_key) &&
	    ovs_key_lens[key_type] != -1))
646 647 648 649
		return -EINVAL;

	switch (key_type) {
	const struct ovs_key_ipv4 *ipv4_key;
650
	const struct ovs_key_ipv6 *ipv6_key;
651
	int err;
652 653

	case OVS_KEY_ATTR_PRIORITY:
654
	case OVS_KEY_ATTR_SKB_MARK:
655 656 657
	case OVS_KEY_ATTR_ETHERNET:
		break;

658 659 660 661 662 663 664
	case OVS_KEY_ATTR_TUNNEL:
		*set_tun = true;
		err = validate_and_copy_set_tun(a, sfa);
		if (err)
			return err;
		break;

665 666 667 668
	case OVS_KEY_ATTR_IPV4:
		if (flow_key->eth.type != htons(ETH_P_IP))
			return -EINVAL;

669
		if (!flow_key->ip.proto)
670 671 672 673 674 675 676 677 678 679 680
			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;

681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
	case OVS_KEY_ATTR_IPV6:
		if (flow_key->eth.type != htons(ETH_P_IPV6))
			return -EINVAL;

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

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

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

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

		break;

700 701 702 703
	case OVS_KEY_ATTR_TCP:
		if (flow_key->ip.proto != IPPROTO_TCP)
			return -EINVAL;

704
		return validate_tp_port(flow_key);
705 706 707 708 709

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

710
		return validate_tp_port(flow_key);
711 712 713 714 715 716 717 718 719 720 721 722

	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 },
723
		[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
	};
	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;
}

740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
static int copy_action(const struct nlattr *from,
		       struct sw_flow_actions **sfa)
{
	int totlen = NLA_ALIGN(from->nla_len);
	struct nlattr *to;

	to = reserve_sfa_size(sfa, from->nla_len);
	if (IS_ERR(to))
		return PTR_ERR(to);

	memcpy(to, from, totlen);
	return 0;
}

static int validate_and_copy_actions(const struct nlattr *attr,
				     const struct sw_flow_key *key,
				     int depth,
				     struct sw_flow_actions **sfa)
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
{
	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);
777
		bool skip_copy;
778 779 780 781 782 783

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

784
		skip_copy = false;
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		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:
813
			err = validate_set(a, key, sfa, &skip_copy);
814 815 816 817 818
			if (err)
				return err;
			break;

		case OVS_ACTION_ATTR_SAMPLE:
819
			err = validate_and_copy_sample(a, key, depth, sfa);
820 821
			if (err)
				return err;
822
			skip_copy = true;
823 824 825 826 827
			break;

		default:
			return -EINVAL;
		}
828 829 830 831 832
		if (!skip_copy) {
			err = copy_action(a, sfa);
			if (err)
				return err;
		}
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
	}

	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] ||
864
	    !a[OVS_PACKET_ATTR_ACTIONS])
865 866 867 868 869 870 871 872 873
		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);

874
	nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
875 876 877 878 879 880 881

	skb_reset_mac_header(packet);
	eth = eth_hdr(packet);

	/* Normally, setting the skb 'protocol' field would be handled by a
	 * call to eth_type_trans(), but it assumes there's a sending
	 * device, which we may not have. */
Simon Horman's avatar
Simon Horman committed
882
	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
883 884 885 886 887 888 889 890 891 892 893 894 895 896
		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;

897
	err = ovs_flow_metadata_from_nlattrs(flow, key_len, a[OVS_PACKET_ATTR_KEY]);
898 899
	if (err)
		goto err_flow_free;
900
	acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
901 902 903
	err = PTR_ERR(acts);
	if (IS_ERR(acts))
		goto err_flow_free;
904 905

	err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
906
	rcu_assign_pointer(flow->sf_acts, acts);
907 908
	if (err)
		goto err_flow_free;
909 910 911

	OVS_CB(packet)->flow = flow;
	packet->priority = flow->key.phy.priority;
912
	packet->mark = flow->key.phy.skb_mark;
913 914

	rcu_read_lock();
915
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
	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] = {
939
	[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	[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;
955
	struct flow_table *table = ovsl_dereference(dp->table);
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

	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,
989
	.maxattr = OVS_FLOW_ATTR_MAX,
990 991
	.netnsok = true,
	.parallel_ops = true,
992 993 994 995 996 997
};

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

998 999 1000 1001 1002 1003 1004 1005 1006 1007 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
static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
{
	const struct nlattr *a;
	struct nlattr *start;
	int err = 0, rem;

	start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
	if (!start)
		return -EMSGSIZE;

	nla_for_each_nested(a, attr, rem) {
		int type = nla_type(a);
		struct nlattr *st_sample;

		switch (type) {
		case OVS_SAMPLE_ATTR_PROBABILITY:
			if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
				return -EMSGSIZE;
			break;
		case OVS_SAMPLE_ATTR_ACTIONS:
			st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
			if (!st_sample)
				return -EMSGSIZE;
			err = actions_to_attr(nla_data(a), nla_len(a), skb);
			if (err)
				return err;
			nla_nest_end(skb, st_sample);
			break;
		}
	}

	nla_nest_end(skb, start);
	return err;
}

1034 1035 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
static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
{
	const struct nlattr *ovs_key = nla_data(a);
	int key_type = nla_type(ovs_key);
	struct nlattr *start;
	int err;

	switch (key_type) {
	case OVS_KEY_ATTR_IPV4_TUNNEL:
		start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
		if (!start)
			return -EMSGSIZE;

		err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key));
		if (err)
			return err;
		nla_nest_end(skb, start);
		break;
	default:
		if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
			return -EMSGSIZE;
		break;
	}

	return 0;
}

1061 1062 1063 1064 1065 1066 1067 1068 1069
static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
{
	const struct nlattr *a;
	int rem, err;

	nla_for_each_attr(a, attr, len, rem) {
		int type = nla_type(a);

		switch (type) {
1070 1071 1072 1073 1074 1075
		case OVS_ACTION_ATTR_SET:
			err = set_action_to_attr(a, skb);
			if (err)
				return err;
			break;

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
		case OVS_ACTION_ATTR_SAMPLE:
			err = sample_action_to_attr(a, skb);
			if (err)
				return err;
			break;
		default:
			if (nla_put(skb, type, nla_len(a), nla_data(a)))
				return -EMSGSIZE;
			break;
		}
	}

	return 0;
}

1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
{
	return NLMSG_ALIGN(sizeof(struct ovs_header))
		+ nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
		+ nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
		+ nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
		+ nla_total_size(8) /* OVS_FLOW_ATTR_USED */
		+ nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
}

1101
/* Called with ovs_mutex. */
1102
static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1103
				  struct sk_buff *skb, u32 portid,
1104 1105 1106 1107
				  u32 seq, u32 flags, u8 cmd)
{
	const int skb_orig_len = skb->len;
	const struct sw_flow_actions *sf_acts;
1108
	struct nlattr *start;
1109 1110 1111 1112 1113 1114 1115
	struct ovs_flow_stats stats;
	struct ovs_header *ovs_header;
	struct nlattr *nla;
	unsigned long used;
	u8 tcp_flags;
	int err;

1116
	sf_acts = ovsl_dereference(flow->sf_acts);
1117

1118
	ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
	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);

1139 1140 1141
	if (used &&
	    nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
		goto nla_put_failure;
1142

1143 1144 1145 1146
	if (stats.n_packets &&
	    nla_put(skb, OVS_FLOW_ATTR_STATS,
		    sizeof(struct ovs_flow_stats), &stats))
		goto nla_put_failure;
1147

1148 1149 1150
	if (tcp_flags &&
	    nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
		goto nla_put_failure;
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161

	/* 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.
	 */
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
	if (start) {
		err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
		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;
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188

	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;

1189
	sf_acts = ovsl_dereference(flow->sf_acts);
1190

1191
	return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1192 1193 1194 1195
}

static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
					       struct datapath *dp,
1196
					       u32 portid, u32 seq, u8 cmd)
1197 1198 1199 1200 1201 1202 1203 1204
{
	struct sk_buff *skb;
	int retval;

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

1205
	retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	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;
1219
	struct sw_flow_actions *acts = NULL;
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
	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]) {
1233 1234 1235
		acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
		error = PTR_ERR(acts);
		if (IS_ERR(acts))
1236
			goto error;
1237 1238 1239 1240

		error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0, &acts);
		if (error)
			goto err_kfree;
1241 1242 1243 1244 1245
	} else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
		error = -EINVAL;
		goto error;
	}

1246
	ovs_lock();
1247
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1248 1249
	error = -ENODEV;
	if (!dp)
1250
		goto err_unlock_ovs;
1251

1252
	table = ovsl_dereference(dp->table);
1253 1254 1255 1256 1257
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
	if (!flow) {
		/* Bail out if we're not allowed to create a new flow. */
		error = -ENOENT;
		if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1258
			goto err_unlock_ovs;
1259 1260 1261 1262 1263 1264 1265 1266 1267

		/* 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);
1268
				table = ovsl_dereference(dp->table);
1269 1270 1271 1272 1273 1274 1275
			}
		}

		/* Allocate flow. */
		flow = ovs_flow_alloc();
		if (IS_ERR(flow)) {
			error = PTR_ERR(flow);
1276
			goto err_unlock_ovs;
1277 1278 1279 1280 1281 1282
		}
		clear_stats(flow);

		rcu_assign_pointer(flow->sf_acts, acts);

		/* Put flow in bucket. */
1283
		ovs_flow_tbl_insert(table, flow, &key, key_len);
1284

1285
		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
						info->snd_seq,
						OVS_FLOW_CMD_NEW);
	} else {
		/* We found a matching flow. */
		struct sw_flow_actions *old_acts;

		/* 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))
1301
			goto err_unlock_ovs;
1302 1303

		/* Update actions. */
1304
		old_acts = ovsl_dereference(flow->sf_acts);
1305 1306
		rcu_assign_pointer(flow->sf_acts, acts);
		ovs_flow_deferred_free_acts(old_acts);
1307

1308
		reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1309 1310 1311 1312 1313 1314 1315 1316 1317
					       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);
		}
	}
1318
	ovs_unlock();
1319 1320

	if (!IS_ERR(reply))
1321
		ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1322
	else
1323
		netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1324 1325 1326
				ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
	return 0;

1327 1328
err_unlock_ovs:
	ovs_unlock();
1329 1330
err_kfree:
	kfree(acts);
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
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;

1353
	ovs_lock();
1354
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1355 1356 1357 1358
	if (!dp) {
		err = -ENODEV;
		goto unlock;
	}
1359

1360
	table = ovsl_dereference(dp->table);
1361
	flow = ovs_flow_tbl_lookup(table, &key, key_len);
1362 1363 1364 1365
	if (!flow) {
		err = -ENOENT;
		goto unlock;
	}
1366

1367
	reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1368
					info->snd_seq, OVS_FLOW_CMD_NEW);
1369 1370 1371 1372
	if (IS_ERR(reply)) {
		err = PTR_ERR(reply);
		goto unlock;
	}
1373

1374
	ovs_unlock();
1375
	return genlmsg_reply(reply, info);
1376 1377 1378
unlock:
	ovs_unlock();
	return err;
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
}

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;

1393
	ovs_lock();
1394
	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1395 1396 1397 1398
	if (!dp) {
		err = -ENODEV;
		goto unlock;
	}