1/*
   2 * Copyright (c) 2007-2014 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of version 2 of the GNU General Public
   6 * License as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11 * General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16 * 02110-1301, USA
  17 */
  18
  19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21#include <linux/init.h>
  22#include <linux/module.h>
  23#include <linux/if_arp.h>
  24#include <linux/if_vlan.h>
  25#include <linux/in.h>
  26#include <linux/ip.h>
  27#include <linux/jhash.h>
  28#include <linux/delay.h>
  29#include <linux/time.h>
  30#include <linux/etherdevice.h>
  31#include <linux/genetlink.h>
  32#include <linux/kernel.h>
  33#include <linux/kthread.h>
  34#include <linux/mutex.h>
  35#include <linux/percpu.h>
  36#include <linux/rcupdate.h>
  37#include <linux/tcp.h>
  38#include <linux/udp.h>
  39#include <linux/ethtool.h>
  40#include <linux/wait.h>
  41#include <asm/div64.h>
  42#include <linux/highmem.h>
  43#include <linux/netfilter_bridge.h>
  44#include <linux/netfilter_ipv4.h>
  45#include <linux/inetdevice.h>
  46#include <linux/list.h>
  47#include <linux/openvswitch.h>
  48#include <linux/rculist.h>
  49#include <linux/dmi.h>
  50#include <net/genetlink.h>
  51#include <net/net_namespace.h>
  52#include <net/netns/generic.h>
  53
  54#include "datapath.h"
  55#include "flow.h"
  56#include "flow_table.h"
  57#include "flow_netlink.h"
 
  58#include "vport-internal_dev.h"
  59#include "vport-netdev.h"
  60
  61unsigned int ovs_net_id __read_mostly;
  62
  63static struct genl_family dp_packet_genl_family;
  64static struct genl_family dp_flow_genl_family;
  65static struct genl_family dp_datapath_genl_family;
  66
  67static const struct nla_policy flow_policy[];
  68
  69static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  70	.name = OVS_FLOW_MCGROUP,
  71};
  72
  73static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  74	.name = OVS_DATAPATH_MCGROUP,
  75};
  76
  77static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  78	.name = OVS_VPORT_MCGROUP,
  79};
  80
  81/* Check if need to build a reply message.
  82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  83static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  84			    unsigned int group)
  85{
  86	return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  87	       genl_has_listeners(family, genl_info_net(info), group);
  88}
  89
  90static void ovs_notify(struct genl_family *family,
  91		       struct sk_buff *skb, struct genl_info *info)
  92{
  93	genl_notify(family, skb, info, 0, GFP_KERNEL);
  94}
  95
  96/**
  97 * DOC: Locking:
  98 *
  99 * All writes e.g. Writes to device state (add/remove datapath, port, set
 100 * operations on vports, etc.), Writes to other state (flow table
 101 * modifications, set miscellaneous datapath parameters, etc.) are protected
 102 * by ovs_lock.
 103 *
 104 * Reads are protected by RCU.
 105 *
 106 * There are a few special cases (mostly stats) that have their own
 107 * synchronization but they nest under all of above and don't interact with
 108 * each other.
 109 *
 110 * The RTNL lock nests inside ovs_mutex.
 111 */
 112
 113static DEFINE_MUTEX(ovs_mutex);
 114
 115void ovs_lock(void)
 116{
 117	mutex_lock(&ovs_mutex);
 118}
 119
 120void ovs_unlock(void)
 121{
 122	mutex_unlock(&ovs_mutex);
 123}
 124
 125#ifdef CONFIG_LOCKDEP
 126int lockdep_ovsl_is_held(void)
 127{
 128	if (debug_locks)
 129		return lockdep_is_held(&ovs_mutex);
 130	else
 131		return 1;
 132}
 133#endif
 134
 135static struct vport *new_vport(const struct vport_parms *);
 136static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 137			     const struct sw_flow_key *,
 138			     const struct dp_upcall_info *,
 139			     uint32_t cutlen);
 140static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 141				  const struct sw_flow_key *,
 142				  const struct dp_upcall_info *,
 143				  uint32_t cutlen);
 144
 145/* Must be called with rcu_read_lock. */
 146static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 147{
 148	struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 149
 150	if (dev) {
 151		struct vport *vport = ovs_internal_dev_get_vport(dev);
 152		if (vport)
 153			return vport->dp;
 154	}
 155
 156	return NULL;
 157}
 158
 159/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
 160 * returned dp pointer valid.
 161 */
 162static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
 163{
 164	struct datapath *dp;
 165
 166	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
 167	rcu_read_lock();
 168	dp = get_dp_rcu(net, dp_ifindex);
 169	rcu_read_unlock();
 170
 171	return dp;
 172}
 173
 174/* Must be called with rcu_read_lock or ovs_mutex. */
 175const char *ovs_dp_name(const struct datapath *dp)
 176{
 177	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 178	return ovs_vport_name(vport);
 179}
 180
 181static int get_dpifindex(const struct datapath *dp)
 182{
 183	struct vport *local;
 184	int ifindex;
 185
 186	rcu_read_lock();
 187
 188	local = ovs_vport_rcu(dp, OVSP_LOCAL);
 189	if (local)
 190		ifindex = local->dev->ifindex;
 191	else
 192		ifindex = 0;
 193
 194	rcu_read_unlock();
 195
 196	return ifindex;
 197}
 198
 199static void destroy_dp_rcu(struct rcu_head *rcu)
 200{
 201	struct datapath *dp = container_of(rcu, struct datapath, rcu);
 202
 203	ovs_flow_tbl_destroy(&dp->table);
 204	free_percpu(dp->stats_percpu);
 205	kfree(dp->ports);
 
 206	kfree(dp);
 207}
 208
 209static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 210					    u16 port_no)
 211{
 212	return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 213}
 214
 215/* Called with ovs_mutex or RCU read lock. */
 216struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 217{
 218	struct vport *vport;
 219	struct hlist_head *head;
 220
 221	head = vport_hash_bucket(dp, port_no);
 222	hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 223		if (vport->port_no == port_no)
 224			return vport;
 225	}
 226	return NULL;
 227}
 228
 229/* Called with ovs_mutex. */
 230static struct vport *new_vport(const struct vport_parms *parms)
 231{
 232	struct vport *vport;
 233
 234	vport = ovs_vport_add(parms);
 235	if (!IS_ERR(vport)) {
 236		struct datapath *dp = parms->dp;
 237		struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 238
 239		hlist_add_head_rcu(&vport->dp_hash_node, head);
 240	}
 241	return vport;
 242}
 243
 244void ovs_dp_detach_port(struct vport *p)
 245{
 246	ASSERT_OVSL();
 247
 248	/* First drop references to device. */
 249	hlist_del_rcu(&p->dp_hash_node);
 250
 251	/* Then destroy it. */
 252	ovs_vport_del(p);
 253}
 254
 255/* Must be called with rcu_read_lock. */
 256void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 257{
 258	const struct vport *p = OVS_CB(skb)->input_vport;
 259	struct datapath *dp = p->dp;
 260	struct sw_flow *flow;
 261	struct sw_flow_actions *sf_acts;
 262	struct dp_stats_percpu *stats;
 263	u64 *stats_counter;
 264	u32 n_mask_hit;
 
 265
 266	stats = this_cpu_ptr(dp->stats_percpu);
 267
 268	/* Look up flow. */
 269	flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 270	if (unlikely(!flow)) {
 271		struct dp_upcall_info upcall;
 272		int error;
 273
 274		memset(&upcall, 0, sizeof(upcall));
 275		upcall.cmd = OVS_PACKET_CMD_MISS;
 276		upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 277		upcall.mru = OVS_CB(skb)->mru;
 278		error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 279		if (unlikely(error))
 280			kfree_skb(skb);
 281		else
 282			consume_skb(skb);
 283		stats_counter = &stats->n_missed;
 284		goto out;
 285	}
 286
 287	ovs_flow_stats_update(flow, key->tp.flags, skb);
 288	sf_acts = rcu_dereference(flow->sf_acts);
 289	ovs_execute_actions(dp, skb, sf_acts, key);
 
 
 
 290
 291	stats_counter = &stats->n_hit;
 292
 293out:
 294	/* Update datapath statistics. */
 295	u64_stats_update_begin(&stats->syncp);
 296	(*stats_counter)++;
 297	stats->n_mask_hit += n_mask_hit;
 298	u64_stats_update_end(&stats->syncp);
 299}
 300
 301int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 302		  const struct sw_flow_key *key,
 303		  const struct dp_upcall_info *upcall_info,
 304		  uint32_t cutlen)
 305{
 306	struct dp_stats_percpu *stats;
 307	int err;
 308
 309	if (upcall_info->portid == 0) {
 310		err = -ENOTCONN;
 311		goto err;
 312	}
 313
 314	if (!skb_is_gso(skb))
 315		err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 316	else
 317		err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 318	if (err)
 319		goto err;
 320
 321	return 0;
 322
 323err:
 324	stats = this_cpu_ptr(dp->stats_percpu);
 325
 326	u64_stats_update_begin(&stats->syncp);
 327	stats->n_lost++;
 328	u64_stats_update_end(&stats->syncp);
 329
 330	return err;
 331}
 332
 333static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 334			     const struct sw_flow_key *key,
 335			     const struct dp_upcall_info *upcall_info,
 336				 uint32_t cutlen)
 337{
 338	unsigned short gso_type = skb_shinfo(skb)->gso_type;
 339	struct sw_flow_key later_key;
 340	struct sk_buff *segs, *nskb;
 341	int err;
 342
 343	BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 344	segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 345	if (IS_ERR(segs))
 346		return PTR_ERR(segs);
 347	if (segs == NULL)
 348		return -EINVAL;
 349
 350	if (gso_type & SKB_GSO_UDP) {
 351		/* The initial flow key extracted by ovs_flow_key_extract()
 352		 * in this case is for a first fragment, so we need to
 353		 * properly mark later fragments.
 354		 */
 355		later_key = *key;
 356		later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 357	}
 358
 359	/* Queue all of the segments. */
 360	skb = segs;
 361	do {
 362		if (gso_type & SKB_GSO_UDP && skb != segs)
 363			key = &later_key;
 364
 365		err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 366		if (err)
 367			break;
 368
 369	} while ((skb = skb->next));
 370
 371	/* Free all of the segments. */
 372	skb = segs;
 373	do {
 374		nskb = skb->next;
 375		if (err)
 376			kfree_skb(skb);
 377		else
 378			consume_skb(skb);
 379	} while ((skb = nskb));
 380	return err;
 381}
 382
 383static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 384			      unsigned int hdrlen)
 385{
 386	size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 387		+ nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 388		+ nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 389		+ nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
 390
 391	/* OVS_PACKET_ATTR_USERDATA */
 392	if (upcall_info->userdata)
 393		size += NLA_ALIGN(upcall_info->userdata->nla_len);
 394
 395	/* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 396	if (upcall_info->egress_tun_info)
 397		size += nla_total_size(ovs_tun_key_attr_size());
 398
 399	/* OVS_PACKET_ATTR_ACTIONS */
 400	if (upcall_info->actions_len)
 401		size += nla_total_size(upcall_info->actions_len);
 402
 403	/* OVS_PACKET_ATTR_MRU */
 404	if (upcall_info->mru)
 405		size += nla_total_size(sizeof(upcall_info->mru));
 406
 407	return size;
 408}
 409
 410static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 411{
 412	if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 413		size_t plen = NLA_ALIGN(skb->len) - skb->len;
 414
 415		if (plen > 0)
 416			memset(skb_put(skb, plen), 0, plen);
 417	}
 418}
 419
 420static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 421				  const struct sw_flow_key *key,
 422				  const struct dp_upcall_info *upcall_info,
 423				  uint32_t cutlen)
 424{
 425	struct ovs_header *upcall;
 426	struct sk_buff *nskb = NULL;
 427	struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 428	struct nlattr *nla;
 429	size_t len;
 430	unsigned int hlen;
 431	int err, dp_ifindex;
 432
 433	dp_ifindex = get_dpifindex(dp);
 434	if (!dp_ifindex)
 435		return -ENODEV;
 436
 437	if (skb_vlan_tag_present(skb)) {
 438		nskb = skb_clone(skb, GFP_ATOMIC);
 439		if (!nskb)
 440			return -ENOMEM;
 441
 442		nskb = __vlan_hwaccel_push_inside(nskb);
 443		if (!nskb)
 444			return -ENOMEM;
 445
 446		skb = nskb;
 447	}
 448
 449	if (nla_attr_size(skb->len) > USHRT_MAX) {
 450		err = -EFBIG;
 451		goto out;
 452	}
 453
 454	/* Complete checksum if needed */
 455	if (skb->ip_summed == CHECKSUM_PARTIAL &&
 456	    (err = skb_checksum_help(skb)))
 457		goto out;
 458
 459	/* Older versions of OVS user space enforce alignment of the last
 460	 * Netlink attribute to NLA_ALIGNTO which would require extensive
 461	 * padding logic. Only perform zerocopy if padding is not required.
 462	 */
 463	if (dp->user_features & OVS_DP_F_UNALIGNED)
 464		hlen = skb_zerocopy_headlen(skb);
 465	else
 466		hlen = skb->len;
 467
 468	len = upcall_msg_size(upcall_info, hlen - cutlen);
 
 469	user_skb = genlmsg_new(len, GFP_ATOMIC);
 470	if (!user_skb) {
 471		err = -ENOMEM;
 472		goto out;
 473	}
 474
 475	upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 476			     0, upcall_info->cmd);
 
 
 
 
 477	upcall->dp_ifindex = dp_ifindex;
 478
 479	err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 480	BUG_ON(err);
 
 481
 482	if (upcall_info->userdata)
 483		__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 484			  nla_len(upcall_info->userdata),
 485			  nla_data(upcall_info->userdata));
 486
 487	if (upcall_info->egress_tun_info) {
 488		nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 
 
 
 
 
 489		err = ovs_nla_put_tunnel_info(user_skb,
 490					      upcall_info->egress_tun_info);
 491		BUG_ON(err);
 
 
 492		nla_nest_end(user_skb, nla);
 493	}
 494
 495	if (upcall_info->actions_len) {
 496		nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 
 
 
 
 497		err = ovs_nla_put_actions(upcall_info->actions,
 498					  upcall_info->actions_len,
 499					  user_skb);
 500		if (!err)
 501			nla_nest_end(user_skb, nla);
 502		else
 503			nla_nest_cancel(user_skb, nla);
 504	}
 505
 506	/* Add OVS_PACKET_ATTR_MRU */
 507	if (upcall_info->mru) {
 508		if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 509				upcall_info->mru)) {
 510			err = -ENOBUFS;
 511			goto out;
 512		}
 513		pad_packet(dp, user_skb);
 514	}
 515
 516	/* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 517	if (cutlen > 0) {
 518		if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
 519				skb->len)) {
 520			err = -ENOBUFS;
 521			goto out;
 522		}
 523		pad_packet(dp, user_skb);
 524	}
 525
 526	/* Only reserve room for attribute header, packet data is added
 527	 * in skb_zerocopy() */
 528	if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 529		err = -ENOBUFS;
 530		goto out;
 531	}
 532	nla->nla_len = nla_attr_size(skb->len - cutlen);
 533
 534	err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 535	if (err)
 536		goto out;
 537
 538	/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 539	pad_packet(dp, user_skb);
 540
 541	((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 542
 543	err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 544	user_skb = NULL;
 545out:
 546	if (err)
 547		skb_tx_error(skb);
 548	kfree_skb(user_skb);
 549	kfree_skb(nskb);
 550	return err;
 551}
 552
 553static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 554{
 555	struct ovs_header *ovs_header = info->userhdr;
 556	struct net *net = sock_net(skb->sk);
 557	struct nlattr **a = info->attrs;
 558	struct sw_flow_actions *acts;
 559	struct sk_buff *packet;
 560	struct sw_flow *flow;
 561	struct sw_flow_actions *sf_acts;
 562	struct datapath *dp;
 563	struct vport *input_vport;
 564	u16 mru = 0;
 565	int len;
 566	int err;
 567	bool log = !a[OVS_PACKET_ATTR_PROBE];
 568
 569	err = -EINVAL;
 570	if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 571	    !a[OVS_PACKET_ATTR_ACTIONS])
 572		goto err;
 573
 574	len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 575	packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 576	err = -ENOMEM;
 577	if (!packet)
 578		goto err;
 579	skb_reserve(packet, NET_IP_ALIGN);
 580
 581	nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 582
 583	/* Set packet's mru */
 584	if (a[OVS_PACKET_ATTR_MRU]) {
 585		mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 586		packet->ignore_df = 1;
 587	}
 588	OVS_CB(packet)->mru = mru;
 589
 590	/* Build an sw_flow for sending this packet. */
 591	flow = ovs_flow_alloc();
 592	err = PTR_ERR(flow);
 593	if (IS_ERR(flow))
 594		goto err_kfree_skb;
 595
 596	err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 597					     packet, &flow->key, log);
 598	if (err)
 599		goto err_flow_free;
 600
 601	err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 602				   &flow->key, &acts, log);
 603	if (err)
 604		goto err_flow_free;
 605
 606	rcu_assign_pointer(flow->sf_acts, acts);
 607	packet->priority = flow->key.phy.priority;
 608	packet->mark = flow->key.phy.skb_mark;
 609
 610	rcu_read_lock();
 611	dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 612	err = -ENODEV;
 613	if (!dp)
 614		goto err_unlock;
 615
 616	input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 617	if (!input_vport)
 618		input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 619
 620	if (!input_vport)
 621		goto err_unlock;
 622
 623	packet->dev = input_vport->dev;
 624	OVS_CB(packet)->input_vport = input_vport;
 625	sf_acts = rcu_dereference(flow->sf_acts);
 626
 627	local_bh_disable();
 628	err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 629	local_bh_enable();
 630	rcu_read_unlock();
 631
 632	ovs_flow_free(flow, false);
 633	return err;
 634
 635err_unlock:
 636	rcu_read_unlock();
 637err_flow_free:
 638	ovs_flow_free(flow, false);
 639err_kfree_skb:
 640	kfree_skb(packet);
 641err:
 642	return err;
 643}
 644
 645static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 646	[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 647	[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 648	[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 649	[OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 650	[OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 651};
 652
 653static const struct genl_ops dp_packet_genl_ops[] = {
 654	{ .cmd = OVS_PACKET_CMD_EXECUTE,
 
 655	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 656	  .policy = packet_policy,
 657	  .doit = ovs_packet_cmd_execute
 658	}
 659};
 660
 661static struct genl_family dp_packet_genl_family __ro_after_init = {
 662	.hdrsize = sizeof(struct ovs_header),
 663	.name = OVS_PACKET_FAMILY,
 664	.version = OVS_PACKET_VERSION,
 665	.maxattr = OVS_PACKET_ATTR_MAX,
 
 666	.netnsok = true,
 667	.parallel_ops = true,
 668	.ops = dp_packet_genl_ops,
 669	.n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 670	.module = THIS_MODULE,
 671};
 672
 673static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 674			 struct ovs_dp_megaflow_stats *mega_stats)
 675{
 676	int i;
 677
 678	memset(mega_stats, 0, sizeof(*mega_stats));
 679
 680	stats->n_flows = ovs_flow_tbl_count(&dp->table);
 681	mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 682
 683	stats->n_hit = stats->n_missed = stats->n_lost = 0;
 684
 685	for_each_possible_cpu(i) {
 686		const struct dp_stats_percpu *percpu_stats;
 687		struct dp_stats_percpu local_stats;
 688		unsigned int start;
 689
 690		percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 691
 692		do {
 693			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 694			local_stats = *percpu_stats;
 695		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 696
 697		stats->n_hit += local_stats.n_hit;
 698		stats->n_missed += local_stats.n_missed;
 699		stats->n_lost += local_stats.n_lost;
 700		mega_stats->n_mask_hit += local_stats.n_mask_hit;
 701	}
 702}
 703
 704static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 705{
 706	return ovs_identifier_is_ufid(sfid) &&
 707	       !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 708}
 709
 710static bool should_fill_mask(uint32_t ufid_flags)
 711{
 712	return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 713}
 714
 715static bool should_fill_actions(uint32_t ufid_flags)
 716{
 717	return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 718}
 719
 720static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 721				    const struct sw_flow_id *sfid,
 722				    uint32_t ufid_flags)
 723{
 724	size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 725
 726	/* OVS_FLOW_ATTR_UFID */
 727	if (sfid && ovs_identifier_is_ufid(sfid))
 728		len += nla_total_size(sfid->ufid_len);
 729
 730	/* OVS_FLOW_ATTR_KEY */
 731	if (!sfid || should_fill_key(sfid, ufid_flags))
 732		len += nla_total_size(ovs_key_attr_size());
 733
 734	/* OVS_FLOW_ATTR_MASK */
 735	if (should_fill_mask(ufid_flags))
 736		len += nla_total_size(ovs_key_attr_size());
 737
 738	/* OVS_FLOW_ATTR_ACTIONS */
 739	if (should_fill_actions(ufid_flags))
 740		len += nla_total_size(acts->orig_len);
 741
 742	return len
 743		+ nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 744		+ nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 745		+ nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 746}
 747
 748/* Called with ovs_mutex or RCU read lock. */
 749static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 750				   struct sk_buff *skb)
 751{
 752	struct ovs_flow_stats stats;
 753	__be16 tcp_flags;
 754	unsigned long used;
 755
 756	ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 757
 758	if (used &&
 759	    nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 760			      OVS_FLOW_ATTR_PAD))
 761		return -EMSGSIZE;
 762
 763	if (stats.n_packets &&
 764	    nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 765			  sizeof(struct ovs_flow_stats), &stats,
 766			  OVS_FLOW_ATTR_PAD))
 767		return -EMSGSIZE;
 768
 769	if ((u8)ntohs(tcp_flags) &&
 770	     nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 771		return -EMSGSIZE;
 772
 773	return 0;
 774}
 775
 776/* Called with ovs_mutex or RCU read lock. */
 777static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 778				     struct sk_buff *skb, int skb_orig_len)
 779{
 780	struct nlattr *start;
 781	int err;
 782
 783	/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 784	 * this is the first flow to be dumped into 'skb'.  This is unusual for
 785	 * Netlink but individual action lists can be longer than
 786	 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 787	 * The userspace caller can always fetch the actions separately if it
 788	 * really wants them.  (Most userspace callers in fact don't care.)
 789	 *
 790	 * This can only fail for dump operations because the skb is always
 791	 * properly sized for single flows.
 792	 */
 793	start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 794	if (start) {
 795		const struct sw_flow_actions *sf_acts;
 796
 797		sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 798		err = ovs_nla_put_actions(sf_acts->actions,
 799					  sf_acts->actions_len, skb);
 800
 801		if (!err)
 802			nla_nest_end(skb, start);
 803		else {
 804			if (skb_orig_len)
 805				return err;
 806
 807			nla_nest_cancel(skb, start);
 808		}
 809	} else if (skb_orig_len) {
 810		return -EMSGSIZE;
 811	}
 812
 813	return 0;
 814}
 815
 816/* Called with ovs_mutex or RCU read lock. */
 817static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 818				  struct sk_buff *skb, u32 portid,
 819				  u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 820{
 821	const int skb_orig_len = skb->len;
 822	struct ovs_header *ovs_header;
 823	int err;
 824
 825	ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 826				 flags, cmd);
 827	if (!ovs_header)
 828		return -EMSGSIZE;
 829
 830	ovs_header->dp_ifindex = dp_ifindex;
 831
 832	err = ovs_nla_put_identifier(flow, skb);
 833	if (err)
 834		goto error;
 835
 836	if (should_fill_key(&flow->id, ufid_flags)) {
 837		err = ovs_nla_put_masked_key(flow, skb);
 838		if (err)
 839			goto error;
 840	}
 841
 842	if (should_fill_mask(ufid_flags)) {
 843		err = ovs_nla_put_mask(flow, skb);
 844		if (err)
 845			goto error;
 846	}
 847
 848	err = ovs_flow_cmd_fill_stats(flow, skb);
 849	if (err)
 850		goto error;
 851
 852	if (should_fill_actions(ufid_flags)) {
 853		err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 854		if (err)
 855			goto error;
 856	}
 857
 858	genlmsg_end(skb, ovs_header);
 859	return 0;
 860
 861error:
 862	genlmsg_cancel(skb, ovs_header);
 863	return err;
 864}
 865
 866/* May not be called with RCU read lock. */
 867static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 868					       const struct sw_flow_id *sfid,
 869					       struct genl_info *info,
 870					       bool always,
 871					       uint32_t ufid_flags)
 872{
 873	struct sk_buff *skb;
 874	size_t len;
 875
 876	if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 877		return NULL;
 878
 879	len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 880	skb = genlmsg_new(len, GFP_KERNEL);
 881	if (!skb)
 882		return ERR_PTR(-ENOMEM);
 883
 884	return skb;
 885}
 886
 887/* Called with ovs_mutex. */
 888static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 889					       int dp_ifindex,
 890					       struct genl_info *info, u8 cmd,
 891					       bool always, u32 ufid_flags)
 892{
 893	struct sk_buff *skb;
 894	int retval;
 895
 896	skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 897				      &flow->id, info, always, ufid_flags);
 898	if (IS_ERR_OR_NULL(skb))
 899		return skb;
 900
 901	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 902					info->snd_portid, info->snd_seq, 0,
 903					cmd, ufid_flags);
 904	BUG_ON(retval < 0);
 905	return skb;
 906}
 907
 908static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 909{
 910	struct net *net = sock_net(skb->sk);
 911	struct nlattr **a = info->attrs;
 912	struct ovs_header *ovs_header = info->userhdr;
 913	struct sw_flow *flow = NULL, *new_flow;
 914	struct sw_flow_mask mask;
 915	struct sk_buff *reply;
 916	struct datapath *dp;
 917	struct sw_flow_actions *acts;
 918	struct sw_flow_match match;
 919	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 920	int error;
 921	bool log = !a[OVS_FLOW_ATTR_PROBE];
 922
 923	/* Must have key and actions. */
 924	error = -EINVAL;
 925	if (!a[OVS_FLOW_ATTR_KEY]) {
 926		OVS_NLERR(log, "Flow key attr not present in new flow.");
 927		goto error;
 928	}
 929	if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 930		OVS_NLERR(log, "Flow actions attr not present in new flow.");
 931		goto error;
 932	}
 933
 934	/* Most of the time we need to allocate a new flow, do it before
 935	 * locking.
 936	 */
 937	new_flow = ovs_flow_alloc();
 938	if (IS_ERR(new_flow)) {
 939		error = PTR_ERR(new_flow);
 940		goto error;
 941	}
 942
 943	/* Extract key. */
 944	ovs_match_init(&match, &new_flow->key, false, &mask);
 945	error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 946				  a[OVS_FLOW_ATTR_MASK], log);
 947	if (error)
 948		goto err_kfree_flow;
 949
 950	/* Extract flow identifier. */
 951	error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 952				       &new_flow->key, log);
 953	if (error)
 954		goto err_kfree_flow;
 955
 956	/* unmasked key is needed to match when ufid is not used. */
 957	if (ovs_identifier_is_key(&new_flow->id))
 958		match.key = new_flow->id.unmasked_key;
 959
 960	ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 961
 962	/* Validate actions. */
 963	error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 964				     &new_flow->key, &acts, log);
 965	if (error) {
 966		OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 967		goto err_kfree_flow;
 968	}
 969
 970	reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 971					ufid_flags);
 972	if (IS_ERR(reply)) {
 973		error = PTR_ERR(reply);
 974		goto err_kfree_acts;
 975	}
 976
 977	ovs_lock();
 978	dp = get_dp(net, ovs_header->dp_ifindex);
 979	if (unlikely(!dp)) {
 980		error = -ENODEV;
 981		goto err_unlock_ovs;
 982	}
 983
 984	/* Check if this is a duplicate flow */
 985	if (ovs_identifier_is_ufid(&new_flow->id))
 986		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 987	if (!flow)
 988		flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 989	if (likely(!flow)) {
 990		rcu_assign_pointer(new_flow->sf_acts, acts);
 991
 992		/* Put flow in bucket. */
 993		error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 994		if (unlikely(error)) {
 995			acts = NULL;
 996			goto err_unlock_ovs;
 997		}
 998
 999		if (unlikely(reply)) {
1000			error = ovs_flow_cmd_fill_info(new_flow,
1001						       ovs_header->dp_ifindex,
1002						       reply, info->snd_portid,
1003						       info->snd_seq, 0,
1004						       OVS_FLOW_CMD_NEW,
1005						       ufid_flags);
1006			BUG_ON(error < 0);
1007		}
1008		ovs_unlock();
1009	} else {
1010		struct sw_flow_actions *old_acts;
1011
1012		/* Bail out if we're not allowed to modify an existing flow.
1013		 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014		 * because Generic Netlink treats the latter as a dump
1015		 * request.  We also accept NLM_F_EXCL in case that bug ever
1016		 * gets fixed.
1017		 */
1018		if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1019							 | NLM_F_EXCL))) {
1020			error = -EEXIST;
1021			goto err_unlock_ovs;
1022		}
1023		/* The flow identifier has to be the same for flow updates.
1024		 * Look for any overlapping flow.
1025		 */
1026		if (unlikely(!ovs_flow_cmp(flow, &match))) {
1027			if (ovs_identifier_is_key(&flow->id))
1028				flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029								 &match);
1030			else /* UFID matches but key is different */
1031				flow = NULL;
1032			if (!flow) {
1033				error = -ENOENT;
1034				goto err_unlock_ovs;
1035			}
1036		}
1037		/* Update actions. */
1038		old_acts = ovsl_dereference(flow->sf_acts);
1039		rcu_assign_pointer(flow->sf_acts, acts);
1040
1041		if (unlikely(reply)) {
1042			error = ovs_flow_cmd_fill_info(flow,
1043						       ovs_header->dp_ifindex,
1044						       reply, info->snd_portid,
1045						       info->snd_seq, 0,
1046						       OVS_FLOW_CMD_NEW,
1047						       ufid_flags);
1048			BUG_ON(error < 0);
1049		}
1050		ovs_unlock();
1051
1052		ovs_nla_free_flow_actions_rcu(old_acts);
1053		ovs_flow_free(new_flow, false);
1054	}
1055
1056	if (reply)
1057		ovs_notify(&dp_flow_genl_family, reply, info);
1058	return 0;
1059
1060err_unlock_ovs:
1061	ovs_unlock();
1062	kfree_skb(reply);
1063err_kfree_acts:
1064	ovs_nla_free_flow_actions(acts);
1065err_kfree_flow:
1066	ovs_flow_free(new_flow, false);
1067error:
1068	return error;
1069}
1070
1071/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1072static struct sw_flow_actions *get_flow_actions(struct net *net,
1073						const struct nlattr *a,
1074						const struct sw_flow_key *key,
1075						const struct sw_flow_mask *mask,
1076						bool log)
1077{
1078	struct sw_flow_actions *acts;
1079	struct sw_flow_key masked_key;
1080	int error;
1081
1082	ovs_flow_mask_key(&masked_key, key, true, mask);
1083	error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1084	if (error) {
1085		OVS_NLERR(log,
1086			  "Actions may not be safe on all matching packets");
1087		return ERR_PTR(error);
1088	}
1089
1090	return acts;
1091}
1092
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1093static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1094{
1095	struct net *net = sock_net(skb->sk);
1096	struct nlattr **a = info->attrs;
1097	struct ovs_header *ovs_header = info->userhdr;
1098	struct sw_flow_key key;
1099	struct sw_flow *flow;
1100	struct sw_flow_mask mask;
1101	struct sk_buff *reply = NULL;
1102	struct datapath *dp;
1103	struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1104	struct sw_flow_match match;
1105	struct sw_flow_id sfid;
1106	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1107	int error = 0;
1108	bool log = !a[OVS_FLOW_ATTR_PROBE];
1109	bool ufid_present;
1110
1111	ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1112	if (a[OVS_FLOW_ATTR_KEY]) {
1113		ovs_match_init(&match, &key, true, &mask);
1114		error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1115					  a[OVS_FLOW_ATTR_MASK], log);
1116	} else if (!ufid_present) {
1117		OVS_NLERR(log,
1118			  "Flow set message rejected, Key attribute missing.");
1119		error = -EINVAL;
1120	}
 
 
 
1121	if (error)
1122		goto error;
1123
1124	/* Validate actions. */
1125	if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126		if (!a[OVS_FLOW_ATTR_KEY]) {
1127			OVS_NLERR(log,
1128				  "Flow key attribute not present in set flow.");
1129			error = -EINVAL;
1130			goto error;
1131		}
1132
1133		acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1134					&mask, log);
1135		if (IS_ERR(acts)) {
1136			error = PTR_ERR(acts);
1137			goto error;
1138		}
1139
1140		/* Can allocate before locking if have acts. */
1141		reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1142						ufid_flags);
1143		if (IS_ERR(reply)) {
1144			error = PTR_ERR(reply);
1145			goto err_kfree_acts;
1146		}
1147	}
1148
1149	ovs_lock();
1150	dp = get_dp(net, ovs_header->dp_ifindex);
1151	if (unlikely(!dp)) {
1152		error = -ENODEV;
1153		goto err_unlock_ovs;
1154	}
1155	/* Check that the flow exists. */
1156	if (ufid_present)
1157		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1158	else
1159		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1160	if (unlikely(!flow)) {
1161		error = -ENOENT;
1162		goto err_unlock_ovs;
1163	}
1164
1165	/* Update actions, if present. */
1166	if (likely(acts)) {
1167		old_acts = ovsl_dereference(flow->sf_acts);
1168		rcu_assign_pointer(flow->sf_acts, acts);
1169
1170		if (unlikely(reply)) {
1171			error = ovs_flow_cmd_fill_info(flow,
1172						       ovs_header->dp_ifindex,
1173						       reply, info->snd_portid,
1174						       info->snd_seq, 0,
1175						       OVS_FLOW_CMD_NEW,
1176						       ufid_flags);
1177			BUG_ON(error < 0);
1178		}
1179	} else {
1180		/* Could not alloc without acts before locking. */
1181		reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1182						info, OVS_FLOW_CMD_NEW, false,
1183						ufid_flags);
1184
1185		if (IS_ERR(reply)) {
1186			error = PTR_ERR(reply);
1187			goto err_unlock_ovs;
1188		}
1189	}
1190
1191	/* Clear stats. */
1192	if (a[OVS_FLOW_ATTR_CLEAR])
1193		ovs_flow_stats_clear(flow);
1194	ovs_unlock();
1195
1196	if (reply)
1197		ovs_notify(&dp_flow_genl_family, reply, info);
1198	if (old_acts)
1199		ovs_nla_free_flow_actions_rcu(old_acts);
1200
1201	return 0;
1202
1203err_unlock_ovs:
1204	ovs_unlock();
1205	kfree_skb(reply);
1206err_kfree_acts:
1207	ovs_nla_free_flow_actions(acts);
1208error:
1209	return error;
1210}
1211
1212static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1213{
1214	struct nlattr **a = info->attrs;
1215	struct ovs_header *ovs_header = info->userhdr;
1216	struct net *net = sock_net(skb->sk);
1217	struct sw_flow_key key;
1218	struct sk_buff *reply;
1219	struct sw_flow *flow;
1220	struct datapath *dp;
1221	struct sw_flow_match match;
1222	struct sw_flow_id ufid;
1223	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1224	int err = 0;
1225	bool log = !a[OVS_FLOW_ATTR_PROBE];
1226	bool ufid_present;
1227
1228	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1229	if (a[OVS_FLOW_ATTR_KEY]) {
1230		ovs_match_init(&match, &key, true, NULL);
1231		err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1232					log);
1233	} else if (!ufid_present) {
1234		OVS_NLERR(log,
1235			  "Flow get message rejected, Key attribute missing.");
1236		err = -EINVAL;
1237	}
1238	if (err)
1239		return err;
1240
1241	ovs_lock();
1242	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1243	if (!dp) {
1244		err = -ENODEV;
1245		goto unlock;
1246	}
1247
1248	if (ufid_present)
1249		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1250	else
1251		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1252	if (!flow) {
1253		err = -ENOENT;
1254		goto unlock;
1255	}
1256
1257	reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1258					OVS_FLOW_CMD_NEW, true, ufid_flags);
1259	if (IS_ERR(reply)) {
1260		err = PTR_ERR(reply);
1261		goto unlock;
1262	}
1263
1264	ovs_unlock();
1265	return genlmsg_reply(reply, info);
1266unlock:
1267	ovs_unlock();
1268	return err;
1269}
1270
1271static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1272{
1273	struct nlattr **a = info->attrs;
1274	struct ovs_header *ovs_header = info->userhdr;
1275	struct net *net = sock_net(skb->sk);
1276	struct sw_flow_key key;
1277	struct sk_buff *reply;
1278	struct sw_flow *flow = NULL;
1279	struct datapath *dp;
1280	struct sw_flow_match match;
1281	struct sw_flow_id ufid;
1282	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1283	int err;
1284	bool log = !a[OVS_FLOW_ATTR_PROBE];
1285	bool ufid_present;
1286
1287	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1288	if (a[OVS_FLOW_ATTR_KEY]) {
1289		ovs_match_init(&match, &key, true, NULL);
1290		err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1291					NULL, log);
1292		if (unlikely(err))
1293			return err;
1294	}
1295
1296	ovs_lock();
1297	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1298	if (unlikely(!dp)) {
1299		err = -ENODEV;
1300		goto unlock;
1301	}
1302
1303	if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1304		err = ovs_flow_tbl_flush(&dp->table);
1305		goto unlock;
1306	}
1307
1308	if (ufid_present)
1309		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1310	else
1311		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1312	if (unlikely(!flow)) {
1313		err = -ENOENT;
1314		goto unlock;
1315	}
1316
1317	ovs_flow_tbl_remove(&dp->table, flow);
1318	ovs_unlock();
1319
1320	reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1321					&flow->id, info, false, ufid_flags);
1322	if (likely(reply)) {
1323		if (likely(!IS_ERR(reply))) {
1324			rcu_read_lock();	/*To keep RCU checker happy. */
1325			err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1326						     reply, info->snd_portid,
1327						     info->snd_seq, 0,
1328						     OVS_FLOW_CMD_DEL,
1329						     ufid_flags);
1330			rcu_read_unlock();
1331			BUG_ON(err < 0);
1332
1333			ovs_notify(&dp_flow_genl_family, reply, info);
1334		} else {
1335			netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1336		}
1337	}
1338
1339	ovs_flow_free(flow, true);
1340	return 0;
1341unlock:
1342	ovs_unlock();
1343	return err;
1344}
1345
1346static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1347{
1348	struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1349	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1350	struct table_instance *ti;
1351	struct datapath *dp;
1352	u32 ufid_flags;
1353	int err;
1354
1355	err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1356			    OVS_FLOW_ATTR_MAX, flow_policy);
1357	if (err)
1358		return err;
1359	ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1360
1361	rcu_read_lock();
1362	dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1363	if (!dp) {
1364		rcu_read_unlock();
1365		return -ENODEV;
1366	}
1367
1368	ti = rcu_dereference(dp->table.ti);
1369	for (;;) {
1370		struct sw_flow *flow;
1371		u32 bucket, obj;
1372
1373		bucket = cb->args[0];
1374		obj = cb->args[1];
1375		flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1376		if (!flow)
1377			break;
1378
1379		if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1380					   NETLINK_CB(cb->skb).portid,
1381					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
1382					   OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1383			break;
1384
1385		cb->args[0] = bucket;
1386		cb->args[1] = obj;
1387	}
1388	rcu_read_unlock();
1389	return skb->len;
1390}
1391
1392static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1393	[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1394	[OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1395	[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1396	[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1397	[OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1398	[OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1399	[OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1400};
1401
1402static const struct genl_ops dp_flow_genl_ops[] = {
1403	{ .cmd = OVS_FLOW_CMD_NEW,
 
1404	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1405	  .policy = flow_policy,
1406	  .doit = ovs_flow_cmd_new
1407	},
1408	{ .cmd = OVS_FLOW_CMD_DEL,
 
1409	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1410	  .policy = flow_policy,
1411	  .doit = ovs_flow_cmd_del
1412	},
1413	{ .cmd = OVS_FLOW_CMD_GET,
 
1414	  .flags = 0,		    /* OK for unprivileged users. */
1415	  .policy = flow_policy,
1416	  .doit = ovs_flow_cmd_get,
1417	  .dumpit = ovs_flow_cmd_dump
1418	},
1419	{ .cmd = OVS_FLOW_CMD_SET,
 
1420	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1421	  .policy = flow_policy,
1422	  .doit = ovs_flow_cmd_set,
1423	},
1424};
1425
1426static struct genl_family dp_flow_genl_family __ro_after_init = {
1427	.hdrsize = sizeof(struct ovs_header),
1428	.name = OVS_FLOW_FAMILY,
1429	.version = OVS_FLOW_VERSION,
1430	.maxattr = OVS_FLOW_ATTR_MAX,
 
1431	.netnsok = true,
1432	.parallel_ops = true,
1433	.ops = dp_flow_genl_ops,
1434	.n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1435	.mcgrps = &ovs_dp_flow_multicast_group,
1436	.n_mcgrps = 1,
1437	.module = THIS_MODULE,
1438};
1439
1440static size_t ovs_dp_cmd_msg_size(void)
1441{
1442	size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1443
1444	msgsize += nla_total_size(IFNAMSIZ);
1445	msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1446	msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1447	msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1448
1449	return msgsize;
1450}
1451
1452/* Called with ovs_mutex. */
1453static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1454				u32 portid, u32 seq, u32 flags, u8 cmd)
1455{
1456	struct ovs_header *ovs_header;
1457	struct ovs_dp_stats dp_stats;
1458	struct ovs_dp_megaflow_stats dp_megaflow_stats;
1459	int err;
1460
1461	ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1462				   flags, cmd);
1463	if (!ovs_header)
1464		goto error;
1465
1466	ovs_header->dp_ifindex = get_dpifindex(dp);
1467
1468	err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1469	if (err)
1470		goto nla_put_failure;
1471
1472	get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1473	if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1474			  &dp_stats, OVS_DP_ATTR_PAD))
1475		goto nla_put_failure;
1476
1477	if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1478			  sizeof(struct ovs_dp_megaflow_stats),
1479			  &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1480		goto nla_put_failure;
1481
1482	if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1483		goto nla_put_failure;
1484
1485	genlmsg_end(skb, ovs_header);
1486	return 0;
1487
1488nla_put_failure:
1489	genlmsg_cancel(skb, ovs_header);
1490error:
1491	return -EMSGSIZE;
1492}
1493
1494static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1495{
1496	return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1497}
1498
1499/* Called with rcu_read_lock or ovs_mutex. */
1500static struct datapath *lookup_datapath(struct net *net,
1501					const struct ovs_header *ovs_header,
1502					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1503{
1504	struct datapath *dp;
1505
1506	if (!a[OVS_DP_ATTR_NAME])
1507		dp = get_dp(net, ovs_header->dp_ifindex);
1508	else {
1509		struct vport *vport;
1510
1511		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1512		dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1513	}
1514	return dp ? dp : ERR_PTR(-ENODEV);
1515}
1516
1517static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1518{
1519	struct datapath *dp;
1520
1521	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1522	if (IS_ERR(dp))
1523		return;
1524
1525	WARN(dp->user_features, "Dropping previously announced user features\n");
1526	dp->user_features = 0;
1527}
1528
1529static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
 
 
1530{
1531	if (a[OVS_DP_ATTR_USER_FEATURES])
1532		dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1533}
1534
1535static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1536{
1537	struct nlattr **a = info->attrs;
1538	struct vport_parms parms;
1539	struct sk_buff *reply;
1540	struct datapath *dp;
1541	struct vport *vport;
1542	struct ovs_net *ovs_net;
1543	int err, i;
1544
1545	err = -EINVAL;
1546	if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1547		goto err;
1548
1549	reply = ovs_dp_cmd_alloc_info();
1550	if (!reply)
1551		return -ENOMEM;
1552
1553	err = -ENOMEM;
1554	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1555	if (dp == NULL)
1556		goto err_free_reply;
1557
1558	ovs_dp_set_net(dp, sock_net(skb->sk));
1559
1560	/* Allocate table. */
1561	err = ovs_flow_tbl_init(&dp->table);
1562	if (err)
1563		goto err_free_dp;
1564
1565	dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1566	if (!dp->stats_percpu) {
1567		err = -ENOMEM;
1568		goto err_destroy_table;
1569	}
1570
1571	dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1572			    GFP_KERNEL);
 
1573	if (!dp->ports) {
1574		err = -ENOMEM;
1575		goto err_destroy_percpu;
1576	}
1577
1578	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1579		INIT_HLIST_HEAD(&dp->ports[i]);
1580
 
 
 
 
1581	/* Set up our datapath device. */
1582	parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1583	parms.type = OVS_VPORT_TYPE_INTERNAL;
1584	parms.options = NULL;
1585	parms.dp = dp;
1586	parms.port_no = OVSP_LOCAL;
1587	parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1588
1589	ovs_dp_change(dp, a);
 
 
1590
1591	/* So far only local changes have been made, now need the lock. */
1592	ovs_lock();
1593
1594	vport = new_vport(&parms);
1595	if (IS_ERR(vport)) {
1596		err = PTR_ERR(vport);
1597		if (err == -EBUSY)
1598			err = -EEXIST;
1599
1600		if (err == -EEXIST) {
1601			/* An outdated user space instance that does not understand
1602			 * the concept of user_features has attempted to create a new
1603			 * datapath and is likely to reuse it. Drop all user features.
1604			 */
1605			if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1606				ovs_dp_reset_user_features(skb, info);
1607		}
1608
1609		goto err_destroy_ports_array;
1610	}
1611
1612	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1613				   info->snd_seq, 0, OVS_DP_CMD_NEW);
1614	BUG_ON(err < 0);
1615
1616	ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1617	list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1618
1619	ovs_unlock();
1620
1621	ovs_notify(&dp_datapath_genl_family, reply, info);
1622	return 0;
1623
1624err_destroy_ports_array:
1625	ovs_unlock();
 
 
1626	kfree(dp->ports);
1627err_destroy_percpu:
1628	free_percpu(dp->stats_percpu);
1629err_destroy_table:
1630	ovs_flow_tbl_destroy(&dp->table);
1631err_free_dp:
1632	kfree(dp);
1633err_free_reply:
1634	kfree_skb(reply);
1635err:
1636	return err;
1637}
1638
1639/* Called with ovs_mutex. */
1640static void __dp_destroy(struct datapath *dp)
1641{
1642	int i;
1643
1644	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1645		struct vport *vport;
1646		struct hlist_node *n;
1647
1648		hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1649			if (vport->port_no != OVSP_LOCAL)
1650				ovs_dp_detach_port(vport);
1651	}
1652
1653	list_del_rcu(&dp->list_node);
1654
1655	/* OVSP_LOCAL is datapath internal port. We need to make sure that
1656	 * all ports in datapath are destroyed first before freeing datapath.
1657	 */
1658	ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1659
1660	/* RCU destroy the flow table */
1661	call_rcu(&dp->rcu, destroy_dp_rcu);
1662}
1663
1664static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1665{
1666	struct sk_buff *reply;
1667	struct datapath *dp;
1668	int err;
1669
1670	reply = ovs_dp_cmd_alloc_info();
1671	if (!reply)
1672		return -ENOMEM;
1673
1674	ovs_lock();
1675	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1676	err = PTR_ERR(dp);
1677	if (IS_ERR(dp))
1678		goto err_unlock_free;
1679
1680	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1681				   info->snd_seq, 0, OVS_DP_CMD_DEL);
1682	BUG_ON(err < 0);
1683
1684	__dp_destroy(dp);
1685	ovs_unlock();
1686
1687	ovs_notify(&dp_datapath_genl_family, reply, info);
1688
1689	return 0;
1690
1691err_unlock_free:
1692	ovs_unlock();
1693	kfree_skb(reply);
1694	return err;
1695}
1696
1697static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1698{
1699	struct sk_buff *reply;
1700	struct datapath *dp;
1701	int err;
1702
1703	reply = ovs_dp_cmd_alloc_info();
1704	if (!reply)
1705		return -ENOMEM;
1706
1707	ovs_lock();
1708	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1709	err = PTR_ERR(dp);
1710	if (IS_ERR(dp))
1711		goto err_unlock_free;
1712
1713	ovs_dp_change(dp, info->attrs);
 
 
1714
1715	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1716				   info->snd_seq, 0, OVS_DP_CMD_NEW);
1717	BUG_ON(err < 0);
1718
1719	ovs_unlock();
1720	ovs_notify(&dp_datapath_genl_family, reply, info);
1721
1722	return 0;
1723
1724err_unlock_free:
1725	ovs_unlock();
1726	kfree_skb(reply);
1727	return err;
1728}
1729
1730static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1731{
1732	struct sk_buff *reply;
1733	struct datapath *dp;
1734	int err;
1735
1736	reply = ovs_dp_cmd_alloc_info();
1737	if (!reply)
1738		return -ENOMEM;
1739
1740	ovs_lock();
1741	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1742	if (IS_ERR(dp)) {
1743		err = PTR_ERR(dp);
1744		goto err_unlock_free;
1745	}
1746	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1747				   info->snd_seq, 0, OVS_DP_CMD_NEW);
1748	BUG_ON(err < 0);
1749	ovs_unlock();
1750
1751	return genlmsg_reply(reply, info);
1752
1753err_unlock_free:
1754	ovs_unlock();
1755	kfree_skb(reply);
1756	return err;
1757}
1758
1759static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1760{
1761	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1762	struct datapath *dp;
1763	int skip = cb->args[0];
1764	int i = 0;
1765
1766	ovs_lock();
1767	list_for_each_entry(dp, &ovs_net->dps, list_node) {
1768		if (i >= skip &&
1769		    ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1770					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1771					 OVS_DP_CMD_NEW) < 0)
1772			break;
1773		i++;
1774	}
1775	ovs_unlock();
1776
1777	cb->args[0] = i;
1778
1779	return skb->len;
1780}
1781
1782static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1783	[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1784	[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1785	[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1786};
1787
1788static const struct genl_ops dp_datapath_genl_ops[] = {
1789	{ .cmd = OVS_DP_CMD_NEW,
 
1790	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1791	  .policy = datapath_policy,
1792	  .doit = ovs_dp_cmd_new
1793	},
1794	{ .cmd = OVS_DP_CMD_DEL,
 
1795	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1796	  .policy = datapath_policy,
1797	  .doit = ovs_dp_cmd_del
1798	},
1799	{ .cmd = OVS_DP_CMD_GET,
 
1800	  .flags = 0,		    /* OK for unprivileged users. */
1801	  .policy = datapath_policy,
1802	  .doit = ovs_dp_cmd_get,
1803	  .dumpit = ovs_dp_cmd_dump
1804	},
1805	{ .cmd = OVS_DP_CMD_SET,
 
1806	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1807	  .policy = datapath_policy,
1808	  .doit = ovs_dp_cmd_set,
1809	},
1810};
1811
1812static struct genl_family dp_datapath_genl_family __ro_after_init = {
1813	.hdrsize = sizeof(struct ovs_header),
1814	.name = OVS_DATAPATH_FAMILY,
1815	.version = OVS_DATAPATH_VERSION,
1816	.maxattr = OVS_DP_ATTR_MAX,
 
1817	.netnsok = true,
1818	.parallel_ops = true,
1819	.ops = dp_datapath_genl_ops,
1820	.n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1821	.mcgrps = &ovs_dp_datapath_multicast_group,
1822	.n_mcgrps = 1,
1823	.module = THIS_MODULE,
1824};
1825
1826/* Called with ovs_mutex or RCU read lock. */
1827static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1828				   u32 portid, u32 seq, u32 flags, u8 cmd)
 
1829{
1830	struct ovs_header *ovs_header;
1831	struct ovs_vport_stats vport_stats;
1832	int err;
1833
1834	ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1835				 flags, cmd);
1836	if (!ovs_header)
1837		return -EMSGSIZE;
1838
1839	ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1840
1841	if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1842	    nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1843	    nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1844			   ovs_vport_name(vport)))
 
1845		goto nla_put_failure;
1846
 
 
 
 
 
 
 
1847	ovs_vport_get_stats(vport, &vport_stats);
1848	if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1849			  sizeof(struct ovs_vport_stats), &vport_stats,
1850			  OVS_VPORT_ATTR_PAD))
1851		goto nla_put_failure;
1852
1853	if (ovs_vport_get_upcall_portids(vport, skb))
1854		goto nla_put_failure;
1855
1856	err = ovs_vport_get_options(vport, skb);
1857	if (err == -EMSGSIZE)
1858		goto error;
1859
1860	genlmsg_end(skb, ovs_header);
1861	return 0;
1862
1863nla_put_failure:
1864	err = -EMSGSIZE;
1865error:
1866	genlmsg_cancel(skb, ovs_header);
1867	return err;
1868}
1869
1870static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1871{
1872	return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1873}
1874
1875/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1876struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1877					 u32 seq, u8 cmd)
1878{
1879	struct sk_buff *skb;
1880	int retval;
1881
1882	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1883	if (!skb)
1884		return ERR_PTR(-ENOMEM);
1885
1886	retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
 
1887	BUG_ON(retval < 0);
1888
1889	return skb;
1890}
1891
1892/* Called with ovs_mutex or RCU read lock. */
1893static struct vport *lookup_vport(struct net *net,
1894				  const struct ovs_header *ovs_header,
1895				  struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1896{
1897	struct datapath *dp;
1898	struct vport *vport;
1899
 
 
1900	if (a[OVS_VPORT_ATTR_NAME]) {
1901		vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1902		if (!vport)
1903			return ERR_PTR(-ENODEV);
1904		if (ovs_header->dp_ifindex &&
1905		    ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1906			return ERR_PTR(-ENODEV);
1907		return vport;
1908	} else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1909		u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1910
1911		if (port_no >= DP_MAX_PORTS)
1912			return ERR_PTR(-EFBIG);
1913
1914		dp = get_dp(net, ovs_header->dp_ifindex);
1915		if (!dp)
1916			return ERR_PTR(-ENODEV);
1917
1918		vport = ovs_vport_ovsl_rcu(dp, port_no);
1919		if (!vport)
1920			return ERR_PTR(-ENODEV);
1921		return vport;
1922	} else
1923		return ERR_PTR(-EINVAL);
 
1924}
1925
1926/* Called with ovs_mutex */
1927static void update_headroom(struct datapath *dp)
1928{
1929	unsigned dev_headroom, max_headroom = 0;
1930	struct net_device *dev;
1931	struct vport *vport;
1932	int i;
1933
1934	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1935		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1936			dev = vport->dev;
1937			dev_headroom = netdev_get_fwd_headroom(dev);
1938			if (dev_headroom > max_headroom)
1939				max_headroom = dev_headroom;
1940		}
1941	}
1942
1943	dp->max_headroom = max_headroom;
 
 
 
 
 
 
 
 
 
1944	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1945		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1946			netdev_set_rx_headroom(vport->dev, max_headroom);
1947}
1948
1949static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1950{
1951	struct nlattr **a = info->attrs;
1952	struct ovs_header *ovs_header = info->userhdr;
1953	struct vport_parms parms;
1954	struct sk_buff *reply;
1955	struct vport *vport;
1956	struct datapath *dp;
 
1957	u32 port_no;
1958	int err;
1959
1960	if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1961	    !a[OVS_VPORT_ATTR_UPCALL_PID])
1962		return -EINVAL;
 
 
1963
1964	port_no = a[OVS_VPORT_ATTR_PORT_NO]
1965		? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1966	if (port_no >= DP_MAX_PORTS)
1967		return -EFBIG;
1968
1969	reply = ovs_vport_cmd_alloc_info();
1970	if (!reply)
1971		return -ENOMEM;
1972
1973	ovs_lock();
1974restart:
1975	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1976	err = -ENODEV;
1977	if (!dp)
1978		goto exit_unlock_free;
1979
1980	if (port_no) {
1981		vport = ovs_vport_ovsl(dp, port_no);
1982		err = -EBUSY;
1983		if (vport)
1984			goto exit_unlock_free;
1985	} else {
1986		for (port_no = 1; ; port_no++) {
1987			if (port_no >= DP_MAX_PORTS) {
1988				err = -EFBIG;
1989				goto exit_unlock_free;
1990			}
1991			vport = ovs_vport_ovsl(dp, port_no);
1992			if (!vport)
1993				break;
1994		}
1995	}
1996
1997	parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1998	parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1999	parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2000	parms.dp = dp;
2001	parms.port_no = port_no;
2002	parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2003
2004	vport = new_vport(&parms);
2005	err = PTR_ERR(vport);
2006	if (IS_ERR(vport)) {
2007		if (err == -EAGAIN)
2008			goto restart;
2009		goto exit_unlock_free;
2010	}
2011
2012	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2013				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
 
 
 
2014
2015	if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2016		update_headroom(dp);
2017	else
2018		netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2019
2020	BUG_ON(err < 0);
2021	ovs_unlock();
2022
2023	ovs_notify(&dp_vport_genl_family, reply, info);
2024	return 0;
2025
2026exit_unlock_free:
2027	ovs_unlock();
2028	kfree_skb(reply);
2029	return err;
2030}
2031
2032static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2033{
2034	struct nlattr **a = info->attrs;
2035	struct sk_buff *reply;
2036	struct vport *vport;
2037	int err;
2038
2039	reply = ovs_vport_cmd_alloc_info();
2040	if (!reply)
2041		return -ENOMEM;
2042
2043	ovs_lock();
2044	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2045	err = PTR_ERR(vport);
2046	if (IS_ERR(vport))
2047		goto exit_unlock_free;
2048
2049	if (a[OVS_VPORT_ATTR_TYPE] &&
2050	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2051		err = -EINVAL;
2052		goto exit_unlock_free;
2053	}
2054
2055	if (a[OVS_VPORT_ATTR_OPTIONS]) {
2056		err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2057		if (err)
2058			goto exit_unlock_free;
2059	}
2060
2061
2062	if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2063		struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2064
2065		err = ovs_vport_set_upcall_portids(vport, ids);
2066		if (err)
2067			goto exit_unlock_free;
2068	}
2069
2070	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2071				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
 
2072	BUG_ON(err < 0);
2073
2074	ovs_unlock();
2075	ovs_notify(&dp_vport_genl_family, reply, info);
2076	return 0;
2077
2078exit_unlock_free:
2079	ovs_unlock();
2080	kfree_skb(reply);
2081	return err;
2082}
2083
2084static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2085{
2086	bool must_update_headroom = false;
2087	struct nlattr **a = info->attrs;
2088	struct sk_buff *reply;
2089	struct datapath *dp;
2090	struct vport *vport;
 
2091	int err;
2092
2093	reply = ovs_vport_cmd_alloc_info();
2094	if (!reply)
2095		return -ENOMEM;
2096
2097	ovs_lock();
2098	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2099	err = PTR_ERR(vport);
2100	if (IS_ERR(vport))
2101		goto exit_unlock_free;
2102
2103	if (vport->port_no == OVSP_LOCAL) {
2104		err = -EINVAL;
2105		goto exit_unlock_free;
2106	}
2107
2108	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2109				      info->snd_seq, 0, OVS_VPORT_CMD_DEL);
 
2110	BUG_ON(err < 0);
2111
2112	/* the vport deletion may trigger dp headroom update */
2113	dp = vport->dp;
2114	if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2115		must_update_headroom = true;
 
2116	netdev_reset_rx_headroom(vport->dev);
2117	ovs_dp_detach_port(vport);
2118
2119	if (must_update_headroom)
2120		update_headroom(dp);
 
 
 
 
2121	ovs_unlock();
2122
2123	ovs_notify(&dp_vport_genl_family, reply, info);
2124	return 0;
2125
2126exit_unlock_free:
2127	ovs_unlock();
2128	kfree_skb(reply);
2129	return err;
2130}
2131
2132static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2133{
2134	struct nlattr **a = info->attrs;
2135	struct ovs_header *ovs_header = info->userhdr;
2136	struct sk_buff *reply;
2137	struct vport *vport;
2138	int err;
2139
2140	reply = ovs_vport_cmd_alloc_info();
2141	if (!reply)
2142		return -ENOMEM;
2143
2144	rcu_read_lock();
2145	vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2146	err = PTR_ERR(vport);
2147	if (IS_ERR(vport))
2148		goto exit_unlock_free;
2149	err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2150				      info->snd_seq, 0, OVS_VPORT_CMD_NEW);
 
2151	BUG_ON(err < 0);
2152	rcu_read_unlock();
2153
2154	return genlmsg_reply(reply, info);
2155
2156exit_unlock_free:
2157	rcu_read_unlock();
2158	kfree_skb(reply);
2159	return err;
2160}
2161
2162static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2163{
2164	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2165	struct datapath *dp;
2166	int bucket = cb->args[0], skip = cb->args[1];
2167	int i, j = 0;
2168
2169	rcu_read_lock();
2170	dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2171	if (!dp) {
2172		rcu_read_unlock();
2173		return -ENODEV;
2174	}
2175	for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2176		struct vport *vport;
2177
2178		j = 0;
2179		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2180			if (j >= skip &&
2181			    ovs_vport_cmd_fill_info(vport, skb,
 
2182						    NETLINK_CB(cb->skb).portid,
2183						    cb->nlh->nlmsg_seq,
2184						    NLM_F_MULTI,
2185						    OVS_VPORT_CMD_NEW) < 0)
 
2186				goto out;
2187
2188			j++;
2189		}
2190		skip = 0;
2191	}
2192out:
2193	rcu_read_unlock();
2194
2195	cb->args[0] = i;
2196	cb->args[1] = j;
2197
2198	return skb->len;
2199}
2200
2201static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2202	[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2203	[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2204	[OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2205	[OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2206	[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2207	[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
 
 
2208};
2209
2210static const struct genl_ops dp_vport_genl_ops[] = {
2211	{ .cmd = OVS_VPORT_CMD_NEW,
 
2212	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2213	  .policy = vport_policy,
2214	  .doit = ovs_vport_cmd_new
2215	},
2216	{ .cmd = OVS_VPORT_CMD_DEL,
 
2217	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2218	  .policy = vport_policy,
2219	  .doit = ovs_vport_cmd_del
2220	},
2221	{ .cmd = OVS_VPORT_CMD_GET,
 
2222	  .flags = 0,		    /* OK for unprivileged users. */
2223	  .policy = vport_policy,
2224	  .doit = ovs_vport_cmd_get,
2225	  .dumpit = ovs_vport_cmd_dump
2226	},
2227	{ .cmd = OVS_VPORT_CMD_SET,
 
2228	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2229	  .policy = vport_policy,
2230	  .doit = ovs_vport_cmd_set,
2231	},
2232};
2233
2234struct genl_family dp_vport_genl_family __ro_after_init = {
2235	.hdrsize = sizeof(struct ovs_header),
2236	.name = OVS_VPORT_FAMILY,
2237	.version = OVS_VPORT_VERSION,
2238	.maxattr = OVS_VPORT_ATTR_MAX,
 
2239	.netnsok = true,
2240	.parallel_ops = true,
2241	.ops = dp_vport_genl_ops,
2242	.n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2243	.mcgrps = &ovs_dp_vport_multicast_group,
2244	.n_mcgrps = 1,
2245	.module = THIS_MODULE,
2246};
2247
2248static struct genl_family * const dp_genl_families[] = {
2249	&dp_datapath_genl_family,
2250	&dp_vport_genl_family,
2251	&dp_flow_genl_family,
2252	&dp_packet_genl_family,
 
 
 
 
2253};
2254
2255static void dp_unregister_genl(int n_families)
2256{
2257	int i;
2258
2259	for (i = 0; i < n_families; i++)
2260		genl_unregister_family(dp_genl_families[i]);
2261}
2262
2263static int __init dp_register_genl(void)
2264{
2265	int err;
2266	int i;
2267
2268	for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2269
2270		err = genl_register_family(dp_genl_families[i]);
2271		if (err)
2272			goto error;
2273	}
2274
2275	return 0;
2276
2277error:
2278	dp_unregister_genl(i);
2279	return err;
2280}
2281
2282static int __net_init ovs_init_net(struct net *net)
2283{
2284	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2285
2286	INIT_LIST_HEAD(&ovs_net->dps);
2287	INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2288	ovs_ct_init(net);
2289	return 0;
2290}
2291
2292static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2293					    struct list_head *head)
2294{
2295	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2296	struct datapath *dp;
2297
2298	list_for_each_entry(dp, &ovs_net->dps, list_node) {
2299		int i;
2300
2301		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2302			struct vport *vport;
2303
2304			hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2305				if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2306					continue;
2307
2308				if (dev_net(vport->dev) == dnet)
2309					list_add(&vport->detach_list, head);
2310			}
2311		}
2312	}
2313}
2314
2315static void __net_exit ovs_exit_net(struct net *dnet)
2316{
2317	struct datapath *dp, *dp_next;
2318	struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2319	struct vport *vport, *vport_next;
2320	struct net *net;
2321	LIST_HEAD(head);
2322
2323	ovs_ct_exit(dnet);
2324	ovs_lock();
2325	list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2326		__dp_destroy(dp);
2327
2328	rtnl_lock();
2329	for_each_net(net)
2330		list_vports_from_net(net, dnet, &head);
2331	rtnl_unlock();
2332
2333	/* Detach all vports from given namespace. */
2334	list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2335		list_del(&vport->detach_list);
2336		ovs_dp_detach_port(vport);
2337	}
2338
2339	ovs_unlock();
2340
2341	cancel_work_sync(&ovs_net->dp_notify_work);
2342}
2343
2344static struct pernet_operations ovs_net_ops = {
2345	.init = ovs_init_net,
2346	.exit = ovs_exit_net,
2347	.id   = &ovs_net_id,
2348	.size = sizeof(struct ovs_net),
2349};
2350
2351static int __init dp_init(void)
2352{
2353	int err;
2354
2355	BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2356
2357	pr_info("Open vSwitch switching datapath\n");
2358
2359	err = action_fifos_init();
2360	if (err)
2361		goto error;
2362
2363	err = ovs_internal_dev_rtnl_link_register();
2364	if (err)
2365		goto error_action_fifos_exit;
2366
2367	err = ovs_flow_init();
2368	if (err)
2369		goto error_unreg_rtnl_link;
2370
2371	err = ovs_vport_init();
2372	if (err)
2373		goto error_flow_exit;
2374
2375	err = register_pernet_device(&ovs_net_ops);
2376	if (err)
2377		goto error_vport_exit;
2378
2379	err = register_netdevice_notifier(&ovs_dp_device_notifier);
2380	if (err)
2381		goto error_netns_exit;
2382
2383	err = ovs_netdev_init();
2384	if (err)
2385		goto error_unreg_notifier;
2386
2387	err = dp_register_genl();
2388	if (err < 0)
2389		goto error_unreg_netdev;
2390
2391	return 0;
2392
2393error_unreg_netdev:
2394	ovs_netdev_exit();
2395error_unreg_notifier:
2396	unregister_netdevice_notifier(&ovs_dp_device_notifier);
2397error_netns_exit:
2398	unregister_pernet_device(&ovs_net_ops);
2399error_vport_exit:
2400	ovs_vport_exit();
2401error_flow_exit:
2402	ovs_flow_exit();
2403error_unreg_rtnl_link:
2404	ovs_internal_dev_rtnl_link_unregister();
2405error_action_fifos_exit:
2406	action_fifos_exit();
2407error:
2408	return err;
2409}
2410
2411static void dp_cleanup(void)
2412{
2413	dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2414	ovs_netdev_exit();
2415	unregister_netdevice_notifier(&ovs_dp_device_notifier);
2416	unregister_pernet_device(&ovs_net_ops);
2417	rcu_barrier();
2418	ovs_vport_exit();
2419	ovs_flow_exit();
2420	ovs_internal_dev_rtnl_link_unregister();
2421	action_fifos_exit();
2422}
2423
2424module_init(dp_init);
2425module_exit(dp_cleanup);
2426
2427MODULE_DESCRIPTION("Open vSwitch switching datapath");
2428MODULE_LICENSE("GPL");
2429MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2430MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2431MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2432MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);