net/openvswitch/datapath.c

   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 "meter.h"
  59 #include "vport-internal_dev.h"
  60 #include "vport-netdev.h"
  61
  62 unsigned int ovs_net_id __read_mostly;
  63
  64 static struct genl_family dp_packet_genl_family;
  65 static struct genl_family dp_flow_genl_family;
  66 static struct genl_family dp_datapath_genl_family;
  67
  68 static const struct nla_policy flow_policy[];
  69
  70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  71         .name = OVS_FLOW_MCGROUP,
  72 };
  73
  74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  75         .name = OVS_DATAPATH_MCGROUP,
  76 };
  77
  78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  79         .name = OVS_VPORT_MCGROUP,
  80 };
  81
  82 /* Check if need to build a reply message.
  83  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  85                             unsigned int group)
  86 {
  87         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  88                genl_has_listeners(family, genl_info_net(info), group);
  89 }
  90
  91 static void ovs_notify(struct genl_family *family,
  92                        struct sk_buff *skb, struct genl_info *info)
  93 {
  94         genl_notify(family, skb, info, 0, GFP_KERNEL);
  95 }
  96
  97 /**
  98  * DOC: Locking:
  99  *
 100  * All writes e.g. Writes to device state (add/remove datapath, port, set
 101  * operations on vports, etc.), Writes to other state (flow table
 102  * modifications, set miscellaneous datapath parameters, etc.) are protected
 103  * by ovs_lock.
 104  *
 105  * Reads are protected by RCU.
 106  *
 107  * There are a few special cases (mostly stats) that have their own
 108  * synchronization but they nest under all of above and don't interact with
 109  * each other.
 110  *
 111  * The RTNL lock nests inside ovs_mutex.
 112  */
 113
 114 static DEFINE_MUTEX(ovs_mutex);
 115
 116 void ovs_lock(void)
 117 {
 118         mutex_lock(&ovs_mutex);
 119 }
 120
 121 void ovs_unlock(void)
 122 {
 123         mutex_unlock(&ovs_mutex);
 124 }
 125
 126 #ifdef CONFIG_LOCKDEP
 127 int lockdep_ovsl_is_held(void)
 128 {
 129         if (debug_locks)
 130                 return lockdep_is_held(&ovs_mutex);
 131         else
 132                 return 1;
 133 }
 134 #endif
 135
 136 static struct vport *new_vport(const struct vport_parms *);
 137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 138                              const struct sw_flow_key *,
 139                              const struct dp_upcall_info *,
 140                              uint32_t cutlen);
 141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 142                                   const struct sw_flow_key *,
 143                                   const struct dp_upcall_info *,
 144                                   uint32_t cutlen);
 145
 146 /* Must be called with rcu_read_lock or ovs_mutex. */
 147 const char *ovs_dp_name(const struct datapath *dp)
 148 {
 149         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 150         return ovs_vport_name(vport);
 151 }
 152
 153 static int get_dpifindex(const struct datapath *dp)
 154 {
 155         struct vport *local;
 156         int ifindex;
 157
 158         rcu_read_lock();
 159
 160         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 161         if (local)
 162                 ifindex = local->dev->ifindex;
 163         else
 164                 ifindex = 0;
 165
 166         rcu_read_unlock();
 167
 168         return ifindex;
 169 }
 170
 171 static void destroy_dp_rcu(struct rcu_head *rcu)
 172 {
 173         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 174
 175         ovs_flow_tbl_destroy(&dp->table);
 176         free_percpu(dp->stats_percpu);
 177         kfree(dp->ports);
 178         ovs_meters_exit(dp);
 179         kfree(dp);
 180 }
 181
 182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 183                                             u16 port_no)
 184 {
 185         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 186 }
 187
 188 /* Called with ovs_mutex or RCU read lock. */
 189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 190 {
 191         struct vport *vport;
 192         struct hlist_head *head;
 193
 194         head = vport_hash_bucket(dp, port_no);
 195         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 196                 if (vport->port_no == port_no)
 197                         return vport;
 198         }
 199         return NULL;
 200 }
 201
 202 /* Called with ovs_mutex. */
 203 static struct vport *new_vport(const struct vport_parms *parms)
 204 {
 205         struct vport *vport;
 206
 207         vport = ovs_vport_add(parms);
 208         if (!IS_ERR(vport)) {
 209                 struct datapath *dp = parms->dp;
 210                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 211
 212                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 213         }
 214         return vport;
 215 }
 216
 217 void ovs_dp_detach_port(struct vport *p)
 218 {
 219         ASSERT_OVSL();
 220
 221         /* First drop references to device. */
 222         hlist_del_rcu(&p->dp_hash_node);
 223
 224         /* Then destroy it. */
 225         ovs_vport_del(p);
 226 }
 227
 228 /* Must be called with rcu_read_lock. */
 229 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 230 {
 231         const struct vport *p = OVS_CB(skb)->input_vport;
 232         struct datapath *dp = p->dp;
 233         struct sw_flow *flow;
 234         struct sw_flow_actions *sf_acts;
 235         struct dp_stats_percpu *stats;
 236         u64 *stats_counter;
 237         u32 n_mask_hit;
 238
 239         stats = this_cpu_ptr(dp->stats_percpu);
 240
 241         /* Look up flow. */
 242         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 243         if (unlikely(!flow)) {
 244                 struct dp_upcall_info upcall;
 245                 int error;
 246
 247                 memset(&upcall, 0, sizeof(upcall));
 248                 upcall.cmd = OVS_PACKET_CMD_MISS;
 249                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 250                 upcall.mru = OVS_CB(skb)->mru;
 251                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 252                 if (unlikely(error))
 253                         kfree_skb(skb);
 254                 else
 255                         consume_skb(skb);
 256                 stats_counter = &stats->n_missed;
 257                 goto out;
 258         }
 259
 260         ovs_flow_stats_update(flow, key->tp.flags, skb);
 261         sf_acts = rcu_dereference(flow->sf_acts);
 262         ovs_execute_actions(dp, skb, sf_acts, key);
 263
 264         stats_counter = &stats->n_hit;
 265
 266 out:
 267         /* Update datapath statistics. */
 268         u64_stats_update_begin(&stats->syncp);
 269         (*stats_counter)++;
 270         stats->n_mask_hit += n_mask_hit;
 271         u64_stats_update_end(&stats->syncp);
 272 }
 273
 274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 275                   const struct sw_flow_key *key,
 276                   const struct dp_upcall_info *upcall_info,
 277                   uint32_t cutlen)
 278 {
 279         struct dp_stats_percpu *stats;
 280         int err;
 281
 282         if (upcall_info->portid == 0) {
 283                 err = -ENOTCONN;
 284                 goto err;
 285         }
 286
 287         if (!skb_is_gso(skb))
 288                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 289         else
 290                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 291         if (err)
 292                 goto err;
 293
 294         return 0;
 295
 296 err:
 297         stats = this_cpu_ptr(dp->stats_percpu);
 298
 299         u64_stats_update_begin(&stats->syncp);
 300         stats->n_lost++;
 301         u64_stats_update_end(&stats->syncp);
 302
 303         return err;
 304 }
 305
 306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 307                              const struct sw_flow_key *key,
 308                              const struct dp_upcall_info *upcall_info,
 309                                  uint32_t cutlen)
 310 {
 311         struct sk_buff *segs, *nskb;
 312         int err;
 313
 314         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 315         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 316         if (IS_ERR(segs))
 317                 return PTR_ERR(segs);
 318         if (segs == NULL)
 319                 return -EINVAL;
 320
 321         /* Queue all of the segments. */
 322         skb = segs;
 323         do {
 324                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 325                 if (err)
 326                         break;
 327
 328         } while ((skb = skb->next));
 329
 330         /* Free all of the segments. */
 331         skb = segs;
 332         do {
 333                 nskb = skb->next;
 334                 if (err)
 335                         kfree_skb(skb);
 336                 else
 337                         consume_skb(skb);
 338         } while ((skb = nskb));
 339         return err;
 340 }
 341
 342 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 343                               unsigned int hdrlen, int actions_attrlen)
 344 {
 345         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 346                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 347                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 348                 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
 349
 350         /* OVS_PACKET_ATTR_USERDATA */
 351         if (upcall_info->userdata)
 352                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 353
 354         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 355         if (upcall_info->egress_tun_info)
 356                 size += nla_total_size(ovs_tun_key_attr_size());
 357
 358         /* OVS_PACKET_ATTR_ACTIONS */
 359         if (upcall_info->actions_len)
 360                 size += nla_total_size(actions_attrlen);
 361
 362         /* OVS_PACKET_ATTR_MRU */
 363         if (upcall_info->mru)
 364                 size += nla_total_size(sizeof(upcall_info->mru));
 365
 366         return size;
 367 }
 368
 369 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 370 {
 371         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 372                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 373
 374                 if (plen > 0)
 375                         skb_put_zero(skb, plen);
 376         }
 377 }
 378
 379 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 380                                   const struct sw_flow_key *key,
 381                                   const struct dp_upcall_info *upcall_info,
 382                                   uint32_t cutlen)
 383 {
 384         struct ovs_header *upcall;
 385         struct sk_buff *nskb = NULL;
 386         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 387         struct nlattr *nla;
 388         size_t len;
 389         unsigned int hlen;
 390         int err, dp_ifindex;
 391
 392         dp_ifindex = get_dpifindex(dp);
 393         if (!dp_ifindex)
 394                 return -ENODEV;
 395
 396         if (skb_vlan_tag_present(skb)) {
 397                 nskb = skb_clone(skb, GFP_ATOMIC);
 398                 if (!nskb)
 399                         return -ENOMEM;
 400
 401                 nskb = __vlan_hwaccel_push_inside(nskb);
 402                 if (!nskb)
 403                         return -ENOMEM;
 404
 405                 skb = nskb;
 406         }
 407
 408         if (nla_attr_size(skb->len) > USHRT_MAX) {
 409                 err = -EFBIG;
 410                 goto out;
 411         }
 412
 413         /* Complete checksum if needed */
 414         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 415             (err = skb_csum_hwoffload_help(skb, 0)))
 416                 goto out;
 417
 418         /* Older versions of OVS user space enforce alignment of the last
 419          * Netlink attribute to NLA_ALIGNTO which would require extensive
 420          * padding logic. Only perform zerocopy if padding is not required.
 421          */
 422         if (dp->user_features & OVS_DP_F_UNALIGNED)
 423                 hlen = skb_zerocopy_headlen(skb);
 424         else
 425                 hlen = skb->len;
 426
 427         len = upcall_msg_size(upcall_info, hlen - cutlen,
 428                               OVS_CB(skb)->acts_origlen);
 429         user_skb = genlmsg_new(len, GFP_ATOMIC);
 430         if (!user_skb) {
 431                 err = -ENOMEM;
 432                 goto out;
 433         }
 434
 435         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 436                              0, upcall_info->cmd);
 437         upcall->dp_ifindex = dp_ifindex;
 438
 439         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 440         BUG_ON(err);
 441
 442         if (upcall_info->userdata)
 443                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 444                           nla_len(upcall_info->userdata),
 445                           nla_data(upcall_info->userdata));
 446
 447         if (upcall_info->egress_tun_info) {
 448                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 449                 err = ovs_nla_put_tunnel_info(user_skb,
 450                                               upcall_info->egress_tun_info);
 451                 BUG_ON(err);
 452                 nla_nest_end(user_skb, nla);
 453         }
 454
 455         if (upcall_info->actions_len) {
 456                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 457                 err = ovs_nla_put_actions(upcall_info->actions,
 458                                           upcall_info->actions_len,
 459                                           user_skb);
 460                 if (!err)
 461                         nla_nest_end(user_skb, nla);
 462                 else
 463                         nla_nest_cancel(user_skb, nla);
 464         }
 465
 466         /* Add OVS_PACKET_ATTR_MRU */
 467         if (upcall_info->mru) {
 468                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 469                                 upcall_info->mru)) {
 470                         err = -ENOBUFS;
 471                         goto out;
 472                 }
 473                 pad_packet(dp, user_skb);
 474         }
 475
 476         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 477         if (cutlen > 0) {
 478                 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
 479                                 skb->len)) {
 480                         err = -ENOBUFS;
 481                         goto out;
 482                 }
 483                 pad_packet(dp, user_skb);
 484         }
 485
 486         /* Only reserve room for attribute header, packet data is added
 487          * in skb_zerocopy() */
 488         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 489                 err = -ENOBUFS;
 490                 goto out;
 491         }
 492         nla->nla_len = nla_attr_size(skb->len - cutlen);
 493
 494         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 495         if (err)
 496                 goto out;
 497
 498         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 499         pad_packet(dp, user_skb);
 500
 501         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 502
 503         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 504         user_skb = NULL;
 505 out:
 506         if (err)
 507                 skb_tx_error(skb);
 508         kfree_skb(user_skb);
 509         kfree_skb(nskb);
 510         return err;
 511 }
 512
 513 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 514 {
 515         struct ovs_header *ovs_header = info->userhdr;
 516         struct net *net = sock_net(skb->sk);
 517         struct nlattr **a = info->attrs;
 518         struct sw_flow_actions *acts;
 519         struct sk_buff *packet;
 520         struct sw_flow *flow;
 521         struct sw_flow_actions *sf_acts;
 522         struct datapath *dp;
 523         struct vport *input_vport;
 524         u16 mru = 0;
 525         int len;
 526         int err;
 527         bool log = !a[OVS_PACKET_ATTR_PROBE];
 528
 529         err = -EINVAL;
 530         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 531             !a[OVS_PACKET_ATTR_ACTIONS])
 532                 goto err;
 533
 534         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 535         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 536         err = -ENOMEM;
 537         if (!packet)
 538                 goto err;
 539         skb_reserve(packet, NET_IP_ALIGN);
 540
 541         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 542
 543         /* Set packet's mru */
 544         if (a[OVS_PACKET_ATTR_MRU]) {
 545                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 546                 packet->ignore_df = 1;
 547         }
 548         OVS_CB(packet)->mru = mru;
 549
 550         /* Build an sw_flow for sending this packet. */
 551         flow = ovs_flow_alloc();
 552         err = PTR_ERR(flow);
 553         if (IS_ERR(flow))
 554                 goto err_kfree_skb;
 555
 556         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 557                                              packet, &flow->key, log);
 558         if (err)
 559                 goto err_flow_free;
 560
 561         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 562                                    &flow->key, &acts, log);
 563         if (err)
 564                 goto err_flow_free;
 565
 566         rcu_assign_pointer(flow->sf_acts, acts);
 567         packet->priority = flow->key.phy.priority;
 568         packet->mark = flow->key.phy.skb_mark;
 569
 570         rcu_read_lock();
 571         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 572         err = -ENODEV;
 573         if (!dp)
 574                 goto err_unlock;
 575
 576         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 577         if (!input_vport)
 578                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 579
 580         if (!input_vport)
 581                 goto err_unlock;
 582
 583         packet->dev = input_vport->dev;
 584         OVS_CB(packet)->input_vport = input_vport;
 585         sf_acts = rcu_dereference(flow->sf_acts);
 586
 587         local_bh_disable();
 588         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 589         local_bh_enable();
 590         rcu_read_unlock();
 591
 592         ovs_flow_free(flow, false);
 593         return err;
 594
 595 err_unlock:
 596         rcu_read_unlock();
 597 err_flow_free:
 598         ovs_flow_free(flow, false);
 599 err_kfree_skb:
 600         kfree_skb(packet);
 601 err:
 602         return err;
 603 }
 604
 605 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 606         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 607         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 608         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 609         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 610         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 611 };
 612
 613 static const struct genl_ops dp_packet_genl_ops[] = {
 614         { .cmd = OVS_PACKET_CMD_EXECUTE,
 615           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 616           .policy = packet_policy,
 617           .doit = ovs_packet_cmd_execute
 618         }
 619 };
 620
 621 static struct genl_family dp_packet_genl_family __ro_after_init = {
 622         .hdrsize = sizeof(struct ovs_header),
 623         .name = OVS_PACKET_FAMILY,
 624         .version = OVS_PACKET_VERSION,
 625         .maxattr = OVS_PACKET_ATTR_MAX,
 626         .netnsok = true,
 627         .parallel_ops = true,
 628         .ops = dp_packet_genl_ops,
 629         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 630         .module = THIS_MODULE,
 631 };
 632
 633 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 634                          struct ovs_dp_megaflow_stats *mega_stats)
 635 {
 636         int i;
 637
 638         memset(mega_stats, 0, sizeof(*mega_stats));
 639
 640         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 641         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 642
 643         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 644
 645         for_each_possible_cpu(i) {
 646                 const struct dp_stats_percpu *percpu_stats;
 647                 struct dp_stats_percpu local_stats;
 648                 unsigned int start;
 649
 650                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 651
 652                 do {
 653                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 654                         local_stats = *percpu_stats;
 655                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 656
 657                 stats->n_hit += local_stats.n_hit;
 658                 stats->n_missed += local_stats.n_missed;
 659                 stats->n_lost += local_stats.n_lost;
 660                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 661         }
 662 }
 663
 664 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 665 {
 666         return ovs_identifier_is_ufid(sfid) &&
 667                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 668 }
 669
 670 static bool should_fill_mask(uint32_t ufid_flags)
 671 {
 672         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 673 }
 674
 675 static bool should_fill_actions(uint32_t ufid_flags)
 676 {
 677         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 678 }
 679
 680 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 681                                     const struct sw_flow_id *sfid,
 682                                     uint32_t ufid_flags)
 683 {
 684         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 685
 686         /* OVS_FLOW_ATTR_UFID */
 687         if (sfid && ovs_identifier_is_ufid(sfid))
 688                 len += nla_total_size(sfid->ufid_len);
 689
 690         /* OVS_FLOW_ATTR_KEY */
 691         if (!sfid || should_fill_key(sfid, ufid_flags))
 692                 len += nla_total_size(ovs_key_attr_size());
 693
 694         /* OVS_FLOW_ATTR_MASK */
 695         if (should_fill_mask(ufid_flags))
 696                 len += nla_total_size(ovs_key_attr_size());
 697
 698         /* OVS_FLOW_ATTR_ACTIONS */
 699         if (should_fill_actions(ufid_flags))
 700                 len += nla_total_size(acts->orig_len);
 701
 702         return len
 703                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 704                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 705                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 706 }
 707
 708 /* Called with ovs_mutex or RCU read lock. */
 709 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 710                                    struct sk_buff *skb)
 711 {
 712         struct ovs_flow_stats stats;
 713         __be16 tcp_flags;
 714         unsigned long used;
 715
 716         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 717
 718         if (used &&
 719             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 720                               OVS_FLOW_ATTR_PAD))
 721                 return -EMSGSIZE;
 722
 723         if (stats.n_packets &&
 724             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 725                           sizeof(struct ovs_flow_stats), &stats,
 726                           OVS_FLOW_ATTR_PAD))
 727                 return -EMSGSIZE;
 728
 729         if ((u8)ntohs(tcp_flags) &&
 730              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 731                 return -EMSGSIZE;
 732
 733         return 0;
 734 }
 735
 736 /* Called with ovs_mutex or RCU read lock. */
 737 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 738                                      struct sk_buff *skb, int skb_orig_len)
 739 {
 740         struct nlattr *start;
 741         int err;
 742
 743         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 744          * this is the first flow to be dumped into 'skb'.  This is unusual for
 745          * Netlink but individual action lists can be longer than
 746          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 747          * The userspace caller can always fetch the actions separately if it
 748          * really wants them.  (Most userspace callers in fact don't care.)
 749          *
 750          * This can only fail for dump operations because the skb is always
 751          * properly sized for single flows.
 752          */
 753         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 754         if (start) {
 755                 const struct sw_flow_actions *sf_acts;
 756
 757                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 758                 err = ovs_nla_put_actions(sf_acts->actions,
 759                                           sf_acts->actions_len, skb);
 760
 761                 if (!err)
 762                         nla_nest_end(skb, start);
 763                 else {
 764                         if (skb_orig_len)
 765                                 return err;
 766
 767                         nla_nest_cancel(skb, start);
 768                 }
 769         } else if (skb_orig_len) {
 770                 return -EMSGSIZE;
 771         }
 772
 773         return 0;
 774 }
 775
 776 /* Called with ovs_mutex or RCU read lock. */
 777 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 778                                   struct sk_buff *skb, u32 portid,
 779                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 780 {
 781         const int skb_orig_len = skb->len;
 782         struct ovs_header *ovs_header;
 783         int err;
 784
 785         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 786                                  flags, cmd);
 787         if (!ovs_header)
 788                 return -EMSGSIZE;
 789
 790         ovs_header->dp_ifindex = dp_ifindex;
 791
 792         err = ovs_nla_put_identifier(flow, skb);
 793         if (err)
 794                 goto error;
 795
 796         if (should_fill_key(&flow->id, ufid_flags)) {
 797                 err = ovs_nla_put_masked_key(flow, skb);
 798                 if (err)
 799                         goto error;
 800         }
 801
 802         if (should_fill_mask(ufid_flags)) {
 803                 err = ovs_nla_put_mask(flow, skb);
 804                 if (err)
 805                         goto error;
 806         }
 807
 808         err = ovs_flow_cmd_fill_stats(flow, skb);
 809         if (err)
 810                 goto error;
 811
 812         if (should_fill_actions(ufid_flags)) {
 813                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 814                 if (err)
 815                         goto error;
 816         }
 817
 818         genlmsg_end(skb, ovs_header);
 819         return 0;
 820
 821 error:
 822         genlmsg_cancel(skb, ovs_header);
 823         return err;
 824 }
 825
 826 /* May not be called with RCU read lock. */
 827 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 828                                                const struct sw_flow_id *sfid,
 829                                                struct genl_info *info,
 830                                                bool always,
 831                                                uint32_t ufid_flags)
 832 {
 833         struct sk_buff *skb;
 834         size_t len;
 835
 836         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 837                 return NULL;
 838
 839         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 840         skb = genlmsg_new(len, GFP_KERNEL);
 841         if (!skb)
 842                 return ERR_PTR(-ENOMEM);
 843
 844         return skb;
 845 }
 846
 847 /* Called with ovs_mutex. */
 848 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 849                                                int dp_ifindex,
 850                                                struct genl_info *info, u8 cmd,
 851                                                bool always, u32 ufid_flags)
 852 {
 853         struct sk_buff *skb;
 854         int retval;
 855
 856         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 857                                       &flow->id, info, always, ufid_flags);
 858         if (IS_ERR_OR_NULL(skb))
 859                 return skb;
 860
 861         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 862                                         info->snd_portid, info->snd_seq, 0,
 863                                         cmd, ufid_flags);
 864         BUG_ON(retval < 0);
 865         return skb;
 866 }
 867
 868 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 869 {
 870         struct net *net = sock_net(skb->sk);
 871         struct nlattr **a = info->attrs;
 872         struct ovs_header *ovs_header = info->userhdr;
 873         struct sw_flow *flow = NULL, *new_flow;
 874         struct sw_flow_mask mask;
 875         struct sk_buff *reply;
 876         struct datapath *dp;
 877         struct sw_flow_actions *acts;
 878         struct sw_flow_match match;
 879         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 880         int error;
 881         bool log = !a[OVS_FLOW_ATTR_PROBE];
 882
 883         /* Must have key and actions. */
 884         error = -EINVAL;
 885         if (!a[OVS_FLOW_ATTR_KEY]) {
 886                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 887                 goto error;
 888         }
 889         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 890                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 891                 goto error;
 892         }
 893
 894         /* Most of the time we need to allocate a new flow, do it before
 895          * locking.
 896          */
 897         new_flow = ovs_flow_alloc();
 898         if (IS_ERR(new_flow)) {
 899                 error = PTR_ERR(new_flow);
 900                 goto error;
 901         }
 902
 903         /* Extract key. */
 904         ovs_match_init(&match, &new_flow->key, false, &mask);
 905         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 906                                   a[OVS_FLOW_ATTR_MASK], log);
 907         if (error)
 908                 goto err_kfree_flow;
 909
 910         /* Extract flow identifier. */
 911         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 912                                        &new_flow->key, log);
 913         if (error)
 914                 goto err_kfree_flow;
 915
 916         /* unmasked key is needed to match when ufid is not used. */
 917         if (ovs_identifier_is_key(&new_flow->id))
 918                 match.key = new_flow->id.unmasked_key;
 919
 920         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 921
 922         /* Validate actions. */
 923         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 924                                      &new_flow->key, &acts, log);
 925         if (error) {
 926                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 927                 goto err_kfree_flow;
 928         }
 929
 930         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 931                                         ufid_flags);
 932         if (IS_ERR(reply)) {
 933                 error = PTR_ERR(reply);
 934                 goto err_kfree_acts;
 935         }
 936
 937         ovs_lock();
 938         dp = get_dp(net, ovs_header->dp_ifindex);
 939         if (unlikely(!dp)) {
 940                 error = -ENODEV;
 941                 goto err_unlock_ovs;
 942         }
 943
 944         /* Check if this is a duplicate flow */
 945         if (ovs_identifier_is_ufid(&new_flow->id))
 946                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 947         if (!flow)
 948                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 949         if (likely(!flow)) {
 950                 rcu_assign_pointer(new_flow->sf_acts, acts);
 951
 952                 /* Put flow in bucket. */
 953                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 954                 if (unlikely(error)) {
 955                         acts = NULL;
 956                         goto err_unlock_ovs;
 957                 }
 958
 959                 if (unlikely(reply)) {
 960                         error = ovs_flow_cmd_fill_info(new_flow,
 961                                                        ovs_header->dp_ifindex,
 962                                                        reply, info->snd_portid,
 963                                                        info->snd_seq, 0,
 964                                                        OVS_FLOW_CMD_NEW,
 965                                                        ufid_flags);
 966                         BUG_ON(error < 0);
 967                 }
 968                 ovs_unlock();
 969         } else {
 970                 struct sw_flow_actions *old_acts;
 971
 972                 /* Bail out if we're not allowed to modify an existing flow.
 973                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 974                  * because Generic Netlink treats the latter as a dump
 975                  * request.  We also accept NLM_F_EXCL in case that bug ever
 976                  * gets fixed.
 977                  */
 978                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
 979                                                          | NLM_F_EXCL))) {
 980                         error = -EEXIST;
 981                         goto err_unlock_ovs;
 982                 }
 983                 /* The flow identifier has to be the same for flow updates.
 984                  * Look for any overlapping flow.
 985                  */
 986                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
 987                         if (ovs_identifier_is_key(&flow->id))
 988                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
 989                                                                  &match);
 990                         else /* UFID matches but key is different */
 991                                 flow = NULL;
 992                         if (!flow) {
 993                                 error = -ENOENT;
 994                                 goto err_unlock_ovs;
 995                         }
 996                 }
 997                 /* Update actions. */
 998                 old_acts = ovsl_dereference(flow->sf_acts);
 999                 rcu_assign_pointer(flow->sf_acts, acts);
1000
1001                 if (unlikely(reply)) {
1002                         error = ovs_flow_cmd_fill_info(flow,
1003                                                        ovs_header->dp_ifindex,
1004                                                        reply, info->snd_portid,
1005                                                        info->snd_seq, 0,
1006                                                        OVS_FLOW_CMD_NEW,
1007                                                        ufid_flags);
1008                         BUG_ON(error < 0);
1009                 }
1010                 ovs_unlock();
1011
1012                 ovs_nla_free_flow_actions_rcu(old_acts);
1013                 ovs_flow_free(new_flow, false);
1014         }
1015
1016         if (reply)
1017                 ovs_notify(&dp_flow_genl_family, reply, info);
1018         return 0;
1019
1020 err_unlock_ovs:
1021         ovs_unlock();
1022         kfree_skb(reply);
1023 err_kfree_acts:
1024         ovs_nla_free_flow_actions(acts);
1025 err_kfree_flow:
1026         ovs_flow_free(new_flow, false);
1027 error:
1028         return error;
1029 }
1030
1031 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1032 static struct sw_flow_actions *get_flow_actions(struct net *net,
1033                                                 const struct nlattr *a,
1034                                                 const struct sw_flow_key *key,
1035                                                 const struct sw_flow_mask *mask,
1036                                                 bool log)
1037 {
1038         struct sw_flow_actions *acts;
1039         struct sw_flow_key masked_key;
1040         int error;
1041
1042         ovs_flow_mask_key(&masked_key, key, true, mask);
1043         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1044         if (error) {
1045                 OVS_NLERR(log,
1046                           "Actions may not be safe on all matching packets");
1047                 return ERR_PTR(error);
1048         }
1049
1050         return acts;
1051 }
1052
1053 /* Factor out match-init and action-copy to avoid
1054  * "Wframe-larger-than=1024" warning. Because mask is only
1055  * used to get actions, we new a function to save some
1056  * stack space.
1057  *
1058  * If there are not key and action attrs, we return 0
1059  * directly. In the case, the caller will also not use the
1060  * match as before. If there is action attr, we try to get
1061  * actions and save them to *acts. Before returning from
1062  * the function, we reset the match->mask pointer. Because
1063  * we should not to return match object with dangling reference
1064  * to mask.
1065  * */
1066 static int ovs_nla_init_match_and_action(struct net *net,
1067                                          struct sw_flow_match *match,
1068                                          struct sw_flow_key *key,
1069                                          struct nlattr **a,
1070                                          struct sw_flow_actions **acts,
1071                                          bool log)
1072 {
1073         struct sw_flow_mask mask;
1074         int error = 0;
1075
1076         if (a[OVS_FLOW_ATTR_KEY]) {
1077                 ovs_match_init(match, key, true, &mask);
1078                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1079                                           a[OVS_FLOW_ATTR_MASK], log);
1080                 if (error)
1081                         goto error;
1082         }
1083
1084         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1085                 if (!a[OVS_FLOW_ATTR_KEY]) {
1086                         OVS_NLERR(log,
1087                                   "Flow key attribute not present in set flow.");
1088                         error = -EINVAL;
1089                         goto error;
1090                 }
1091
1092                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1093                                          &mask, log);
1094                 if (IS_ERR(*acts)) {
1095                         error = PTR_ERR(*acts);
1096                         goto error;
1097                 }
1098         }
1099
1100         /* On success, error is 0. */
1101 error:
1102         match->mask = NULL;
1103         return error;
1104 }
1105
1106 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1107 {
1108         struct net *net = sock_net(skb->sk);
1109         struct nlattr **a = info->attrs;
1110         struct ovs_header *ovs_header = info->userhdr;
1111         struct sw_flow_key key;
1112         struct sw_flow *flow;
1113         struct sk_buff *reply = NULL;
1114         struct datapath *dp;
1115         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1116         struct sw_flow_match match;
1117         struct sw_flow_id sfid;
1118         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1119         int error = 0;
1120         bool log = !a[OVS_FLOW_ATTR_PROBE];
1121         bool ufid_present;
1122
1123         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1124         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1125                 OVS_NLERR(log,
1126                           "Flow set message rejected, Key attribute missing.");
1127                 return -EINVAL;
1128         }
1129
1130         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1131                                               &acts, log);
1132         if (error)
1133                 goto error;
1134
1135         if (acts) {
1136                 /* Can allocate before locking if have acts. */
1137                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1138                                                 ufid_flags);
1139                 if (IS_ERR(reply)) {
1140                         error = PTR_ERR(reply);
1141                         goto err_kfree_acts;
1142                 }
1143         }
1144
1145         ovs_lock();
1146         dp = get_dp(net, ovs_header->dp_ifindex);
1147         if (unlikely(!dp)) {
1148                 error = -ENODEV;
1149                 goto err_unlock_ovs;
1150         }
1151         /* Check that the flow exists. */
1152         if (ufid_present)
1153                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1154         else
1155                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1156         if (unlikely(!flow)) {
1157                 error = -ENOENT;
1158                 goto err_unlock_ovs;
1159         }
1160
1161         /* Update actions, if present. */
1162         if (likely(acts)) {
1163                 old_acts = ovsl_dereference(flow->sf_acts);
1164                 rcu_assign_pointer(flow->sf_acts, acts);
1165
1166                 if (unlikely(reply)) {
1167                         error = ovs_flow_cmd_fill_info(flow,
1168                                                        ovs_header->dp_ifindex,
1169                                                        reply, info->snd_portid,
1170                                                        info->snd_seq, 0,
1171                                                        OVS_FLOW_CMD_NEW,
1172                                                        ufid_flags);
1173                         BUG_ON(error < 0);
1174                 }
1175         } else {
1176                 /* Could not alloc without acts before locking. */
1177                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1178                                                 info, OVS_FLOW_CMD_NEW, false,
1179                                                 ufid_flags);
1180
1181                 if (IS_ERR(reply)) {
1182                         error = PTR_ERR(reply);
1183                         goto err_unlock_ovs;
1184                 }
1185         }
1186
1187         /* Clear stats. */
1188         if (a[OVS_FLOW_ATTR_CLEAR])
1189                 ovs_flow_stats_clear(flow);
1190         ovs_unlock();
1191
1192         if (reply)
1193                 ovs_notify(&dp_flow_genl_family, reply, info);
1194         if (old_acts)
1195                 ovs_nla_free_flow_actions_rcu(old_acts);
1196
1197         return 0;
1198
1199 err_unlock_ovs:
1200         ovs_unlock();
1201         kfree_skb(reply);
1202 err_kfree_acts:
1203         ovs_nla_free_flow_actions(acts);
1204 error:
1205         return error;
1206 }
1207
1208 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1209 {
1210         struct nlattr **a = info->attrs;
1211         struct ovs_header *ovs_header = info->userhdr;
1212         struct net *net = sock_net(skb->sk);
1213         struct sw_flow_key key;
1214         struct sk_buff *reply;
1215         struct sw_flow *flow;
1216         struct datapath *dp;
1217         struct sw_flow_match match;
1218         struct sw_flow_id ufid;
1219         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1220         int err = 0;
1221         bool log = !a[OVS_FLOW_ATTR_PROBE];
1222         bool ufid_present;
1223
1224         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1225         if (a[OVS_FLOW_ATTR_KEY]) {
1226                 ovs_match_init(&match, &key, true, NULL);
1227                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1228                                         log);
1229         } else if (!ufid_present) {
1230                 OVS_NLERR(log,
1231                           "Flow get message rejected, Key attribute missing.");
1232                 err = -EINVAL;
1233         }
1234         if (err)
1235                 return err;
1236
1237         ovs_lock();
1238         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1239         if (!dp) {
1240                 err = -ENODEV;
1241                 goto unlock;
1242         }
1243
1244         if (ufid_present)
1245                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1246         else
1247                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1248         if (!flow) {
1249                 err = -ENOENT;
1250                 goto unlock;
1251         }
1252
1253         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1254                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1255         if (IS_ERR(reply)) {
1256                 err = PTR_ERR(reply);
1257                 goto unlock;
1258         }
1259
1260         ovs_unlock();
1261         return genlmsg_reply(reply, info);
1262 unlock:
1263         ovs_unlock();
1264         return err;
1265 }
1266
1267 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1268 {
1269         struct nlattr **a = info->attrs;
1270         struct ovs_header *ovs_header = info->userhdr;
1271         struct net *net = sock_net(skb->sk);
1272         struct sw_flow_key key;
1273         struct sk_buff *reply;
1274         struct sw_flow *flow = NULL;
1275         struct datapath *dp;
1276         struct sw_flow_match match;
1277         struct sw_flow_id ufid;
1278         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1279         int err;
1280         bool log = !a[OVS_FLOW_ATTR_PROBE];
1281         bool ufid_present;
1282
1283         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1284         if (a[OVS_FLOW_ATTR_KEY]) {
1285                 ovs_match_init(&match, &key, true, NULL);
1286                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1287                                         NULL, log);
1288                 if (unlikely(err))
1289                         return err;
1290         }
1291
1292         ovs_lock();
1293         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1294         if (unlikely(!dp)) {
1295                 err = -ENODEV;
1296                 goto unlock;
1297         }
1298
1299         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1300                 err = ovs_flow_tbl_flush(&dp->table);
1301                 goto unlock;
1302         }
1303
1304         if (ufid_present)
1305                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1306         else
1307                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1308         if (unlikely(!flow)) {
1309                 err = -ENOENT;
1310                 goto unlock;
1311         }
1312
1313         ovs_flow_tbl_remove(&dp->table, flow);
1314         ovs_unlock();
1315
1316         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1317                                         &flow->id, info, false, ufid_flags);
1318         if (likely(reply)) {
1319                 if (likely(!IS_ERR(reply))) {
1320                         rcu_read_lock();        /*To keep RCU checker happy. */
1321                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1322                                                      reply, info->snd_portid,
1323                                                      info->snd_seq, 0,
1324                                                      OVS_FLOW_CMD_DEL,
1325                                                      ufid_flags);
1326                         rcu_read_unlock();
1327                         BUG_ON(err < 0);
1328
1329                         ovs_notify(&dp_flow_genl_family, reply, info);
1330                 } else {
1331                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1332                 }
1333         }
1334
1335         ovs_flow_free(flow, true);
1336         return 0;
1337 unlock:
1338         ovs_unlock();
1339         return err;
1340 }
1341
1342 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1343 {
1344         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1345         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1346         struct table_instance *ti;
1347         struct datapath *dp;
1348         u32 ufid_flags;
1349         int err;
1350
1351         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1352                             OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1353         if (err)
1354                 return err;
1355         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1356
1357         rcu_read_lock();
1358         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1359         if (!dp) {
1360                 rcu_read_unlock();
1361                 return -ENODEV;
1362         }
1363
1364         ti = rcu_dereference(dp->table.ti);
1365         for (;;) {
1366                 struct sw_flow *flow;
1367                 u32 bucket, obj;
1368
1369                 bucket = cb->args[0];
1370                 obj = cb->args[1];
1371                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1372                 if (!flow)
1373                         break;
1374
1375                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1376                                            NETLINK_CB(cb->skb).portid,
1377                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1378                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1379                         break;
1380
1381                 cb->args[0] = bucket;
1382                 cb->args[1] = obj;
1383         }
1384         rcu_read_unlock();
1385         return skb->len;
1386 }
1387
1388 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1389         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1390         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1391         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1392         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1393         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1394         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1395         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1396 };
1397
1398 static const struct genl_ops dp_flow_genl_ops[] = {
1399         { .cmd = OVS_FLOW_CMD_NEW,
1400           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1401           .policy = flow_policy,
1402           .doit = ovs_flow_cmd_new
1403         },
1404         { .cmd = OVS_FLOW_CMD_DEL,
1405           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1406           .policy = flow_policy,
1407           .doit = ovs_flow_cmd_del
1408         },
1409         { .cmd = OVS_FLOW_CMD_GET,
1410           .flags = 0,               /* OK for unprivileged users. */
1411           .policy = flow_policy,
1412           .doit = ovs_flow_cmd_get,
1413           .dumpit = ovs_flow_cmd_dump
1414         },
1415         { .cmd = OVS_FLOW_CMD_SET,
1416           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1417           .policy = flow_policy,
1418           .doit = ovs_flow_cmd_set,
1419         },
1420 };
1421
1422 static struct genl_family dp_flow_genl_family __ro_after_init = {
1423         .hdrsize = sizeof(struct ovs_header),
1424         .name = OVS_FLOW_FAMILY,
1425         .version = OVS_FLOW_VERSION,
1426         .maxattr = OVS_FLOW_ATTR_MAX,
1427         .netnsok = true,
1428         .parallel_ops = true,
1429         .ops = dp_flow_genl_ops,
1430         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1431         .mcgrps = &ovs_dp_flow_multicast_group,
1432         .n_mcgrps = 1,
1433         .module = THIS_MODULE,
1434 };
1435
1436 static size_t ovs_dp_cmd_msg_size(void)
1437 {
1438         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1439
1440         msgsize += nla_total_size(IFNAMSIZ);
1441         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1442         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1443         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1444
1445         return msgsize;
1446 }
1447
1448 /* Called with ovs_mutex. */
1449 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1450                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1451 {
1452         struct ovs_header *ovs_header;
1453         struct ovs_dp_stats dp_stats;
1454         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1455         int err;
1456
1457         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1458                                    flags, cmd);
1459         if (!ovs_header)
1460                 goto error;
1461
1462         ovs_header->dp_ifindex = get_dpifindex(dp);
1463
1464         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1465         if (err)
1466                 goto nla_put_failure;
1467
1468         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1469         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1470                           &dp_stats, OVS_DP_ATTR_PAD))
1471                 goto nla_put_failure;
1472
1473         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1474                           sizeof(struct ovs_dp_megaflow_stats),
1475                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1476                 goto nla_put_failure;
1477
1478         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1479                 goto nla_put_failure;
1480
1481         genlmsg_end(skb, ovs_header);
1482         return 0;
1483
1484 nla_put_failure:
1485         genlmsg_cancel(skb, ovs_header);
1486 error:
1487         return -EMSGSIZE;
1488 }
1489
1490 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1491 {
1492         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1493 }
1494
1495 /* Called with rcu_read_lock or ovs_mutex. */
1496 static struct datapath *lookup_datapath(struct net *net,
1497                                         const struct ovs_header *ovs_header,
1498                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1499 {
1500         struct datapath *dp;
1501
1502         if (!a[OVS_DP_ATTR_NAME])
1503                 dp = get_dp(net, ovs_header->dp_ifindex);
1504         else {
1505                 struct vport *vport;
1506
1507                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1508                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1509         }
1510         return dp ? dp : ERR_PTR(-ENODEV);
1511 }
1512
1513 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1514 {
1515         struct datapath *dp;
1516
1517         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1518         if (IS_ERR(dp))
1519                 return;
1520
1521         WARN(dp->user_features, "Dropping previously announced user features\n");
1522         dp->user_features = 0;
1523 }
1524
1525 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1526 {
1527         if (a[OVS_DP_ATTR_USER_FEATURES])
1528                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1529 }
1530
1531 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1532 {
1533         struct nlattr **a = info->attrs;
1534         struct vport_parms parms;
1535         struct sk_buff *reply;
1536         struct datapath *dp;
1537         struct vport *vport;
1538         struct ovs_net *ovs_net;
1539         int err, i;
1540
1541         err = -EINVAL;
1542         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1543                 goto err;
1544
1545         reply = ovs_dp_cmd_alloc_info();
1546         if (!reply)
1547                 return -ENOMEM;
1548
1549         err = -ENOMEM;
1550         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1551         if (dp == NULL)
1552                 goto err_free_reply;
1553
1554         ovs_dp_set_net(dp, sock_net(skb->sk));
1555
1556         /* Allocate table. */
1557         err = ovs_flow_tbl_init(&dp->table);
1558         if (err)
1559                 goto err_free_dp;
1560
1561         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1562         if (!dp->stats_percpu) {
1563                 err = -ENOMEM;
1564                 goto err_destroy_table;
1565         }
1566
1567         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1568                             GFP_KERNEL);
1569         if (!dp->ports) {
1570                 err = -ENOMEM;
1571                 goto err_destroy_percpu;
1572         }
1573
1574         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1575                 INIT_HLIST_HEAD(&dp->ports[i]);
1576
1577         err = ovs_meters_init(dp);
1578         if (err)
1579                 goto err_destroy_ports_array;
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_meters;
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
1624 err_destroy_meters:
1625         ovs_unlock();
1626         ovs_meters_exit(dp);
1627 err_destroy_ports_array:
1628         kfree(dp->ports);
1629 err_destroy_percpu:
1630         free_percpu(dp->stats_percpu);
1631 err_destroy_table:
1632         ovs_flow_tbl_destroy(&dp->table);
1633 err_free_dp:
1634         kfree(dp);
1635 err_free_reply:
1636         kfree_skb(reply);
1637 err:
1638         return err;
1639 }
1640
1641 /* Called with ovs_mutex. */
1642 static void __dp_destroy(struct datapath *dp)
1643 {
1644         int i;
1645
1646         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1647                 struct vport *vport;
1648                 struct hlist_node *n;
1649
1650                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1651                         if (vport->port_no != OVSP_LOCAL)
1652                                 ovs_dp_detach_port(vport);
1653         }
1654
1655         list_del_rcu(&dp->list_node);
1656
1657         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1658          * all ports in datapath are destroyed first before freeing datapath.
1659          */
1660         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1661
1662         /* RCU destroy the flow table */
1663         call_rcu(&dp->rcu, destroy_dp_rcu);
1664 }
1665
1666 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1667 {
1668         struct sk_buff *reply;
1669         struct datapath *dp;
1670         int err;
1671
1672         reply = ovs_dp_cmd_alloc_info();
1673         if (!reply)
1674                 return -ENOMEM;
1675
1676         ovs_lock();
1677         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1678         err = PTR_ERR(dp);
1679         if (IS_ERR(dp))
1680                 goto err_unlock_free;
1681
1682         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1683                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1684         BUG_ON(err < 0);
1685
1686         __dp_destroy(dp);
1687         ovs_unlock();
1688
1689         ovs_notify(&dp_datapath_genl_family, reply, info);
1690
1691         return 0;
1692
1693 err_unlock_free:
1694         ovs_unlock();
1695         kfree_skb(reply);
1696         return err;
1697 }
1698
1699 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1700 {
1701         struct sk_buff *reply;
1702         struct datapath *dp;
1703         int err;
1704
1705         reply = ovs_dp_cmd_alloc_info();
1706         if (!reply)
1707                 return -ENOMEM;
1708
1709         ovs_lock();
1710         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1711         err = PTR_ERR(dp);
1712         if (IS_ERR(dp))
1713                 goto err_unlock_free;
1714
1715         ovs_dp_change(dp, info->attrs);
1716
1717         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1718                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1719         BUG_ON(err < 0);
1720
1721         ovs_unlock();
1722         ovs_notify(&dp_datapath_genl_family, reply, info);
1723
1724         return 0;
1725
1726 err_unlock_free:
1727         ovs_unlock();
1728         kfree_skb(reply);
1729         return err;
1730 }
1731
1732 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1733 {
1734         struct sk_buff *reply;
1735         struct datapath *dp;
1736         int err;
1737
1738         reply = ovs_dp_cmd_alloc_info();
1739         if (!reply)
1740                 return -ENOMEM;
1741
1742         ovs_lock();
1743         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1744         if (IS_ERR(dp)) {
1745                 err = PTR_ERR(dp);
1746                 goto err_unlock_free;
1747         }
1748         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1749                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1750         BUG_ON(err < 0);
1751         ovs_unlock();
1752
1753         return genlmsg_reply(reply, info);
1754
1755 err_unlock_free:
1756         ovs_unlock();
1757         kfree_skb(reply);
1758         return err;
1759 }
1760
1761 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1762 {
1763         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1764         struct datapath *dp;
1765         int skip = cb->args[0];
1766         int i = 0;
1767
1768         ovs_lock();
1769         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1770                 if (i >= skip &&
1771                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1772                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1773                                          OVS_DP_CMD_NEW) < 0)
1774                         break;
1775                 i++;
1776         }
1777         ovs_unlock();
1778
1779         cb->args[0] = i;
1780
1781         return skb->len;
1782 }
1783
1784 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1785         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1786         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1787         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1788 };
1789
1790 static const struct genl_ops dp_datapath_genl_ops[] = {
1791         { .cmd = OVS_DP_CMD_NEW,
1792           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1793           .policy = datapath_policy,
1794           .doit = ovs_dp_cmd_new
1795         },
1796         { .cmd = OVS_DP_CMD_DEL,
1797           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1798           .policy = datapath_policy,
1799           .doit = ovs_dp_cmd_del
1800         },
1801         { .cmd = OVS_DP_CMD_GET,
1802           .flags = 0,               /* OK for unprivileged users. */
1803           .policy = datapath_policy,
1804           .doit = ovs_dp_cmd_get,
1805           .dumpit = ovs_dp_cmd_dump
1806         },
1807         { .cmd = OVS_DP_CMD_SET,
1808           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1809           .policy = datapath_policy,
1810           .doit = ovs_dp_cmd_set,
1811         },
1812 };
1813
1814 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1815         .hdrsize = sizeof(struct ovs_header),
1816         .name = OVS_DATAPATH_FAMILY,
1817         .version = OVS_DATAPATH_VERSION,
1818         .maxattr = OVS_DP_ATTR_MAX,
1819         .netnsok = true,
1820         .parallel_ops = true,
1821         .ops = dp_datapath_genl_ops,
1822         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1823         .mcgrps = &ovs_dp_datapath_multicast_group,
1824         .n_mcgrps = 1,
1825         .module = THIS_MODULE,
1826 };
1827
1828 /* Called with ovs_mutex or RCU read lock. */
1829 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1830                                    struct net *net, u32 portid, u32 seq,
1831                                    u32 flags, u8 cmd)
1832 {
1833         struct ovs_header *ovs_header;
1834         struct ovs_vport_stats vport_stats;
1835         int err;
1836
1837         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1838                                  flags, cmd);
1839         if (!ovs_header)
1840                 return -EMSGSIZE;
1841
1842         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1843
1844         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1845             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1846             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1847                            ovs_vport_name(vport)) ||
1848             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1849                 goto nla_put_failure;
1850
1851         if (!net_eq(net, dev_net(vport->dev))) {
1852                 int id = peernet2id_alloc(net, dev_net(vport->dev));
1853
1854                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1855                         goto nla_put_failure;
1856         }
1857
1858         ovs_vport_get_stats(vport, &vport_stats);
1859         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1860                           sizeof(struct ovs_vport_stats), &vport_stats,
1861                           OVS_VPORT_ATTR_PAD))
1862                 goto nla_put_failure;
1863
1864         if (ovs_vport_get_upcall_portids(vport, skb))
1865                 goto nla_put_failure;
1866
1867         err = ovs_vport_get_options(vport, skb);
1868         if (err == -EMSGSIZE)
1869                 goto error;
1870
1871         genlmsg_end(skb, ovs_header);
1872         return 0;
1873
1874 nla_put_failure:
1875         err = -EMSGSIZE;
1876 error:
1877         genlmsg_cancel(skb, ovs_header);
1878         return err;
1879 }
1880
1881 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1882 {
1883         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1884 }
1885
1886 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1887 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1888                                          u32 portid, u32 seq, u8 cmd)
1889 {
1890         struct sk_buff *skb;
1891         int retval;
1892
1893         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1894         if (!skb)
1895                 return ERR_PTR(-ENOMEM);
1896
1897         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd);
1898         BUG_ON(retval < 0);
1899
1900         return skb;
1901 }
1902
1903 /* Called with ovs_mutex or RCU read lock. */
1904 static struct vport *lookup_vport(struct net *net,
1905                                   const struct ovs_header *ovs_header,
1906                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1907 {
1908         struct datapath *dp;
1909         struct vport *vport;
1910
1911         if (a[OVS_VPORT_ATTR_IFINDEX])
1912                 return ERR_PTR(-EOPNOTSUPP);
1913         if (a[OVS_VPORT_ATTR_NAME]) {
1914                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1915                 if (!vport)
1916                         return ERR_PTR(-ENODEV);
1917                 if (ovs_header->dp_ifindex &&
1918                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1919                         return ERR_PTR(-ENODEV);
1920                 return vport;
1921         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1922                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1923
1924                 if (port_no >= DP_MAX_PORTS)
1925                         return ERR_PTR(-EFBIG);
1926
1927                 dp = get_dp(net, ovs_header->dp_ifindex);
1928                 if (!dp)
1929                         return ERR_PTR(-ENODEV);
1930
1931                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1932                 if (!vport)
1933                         return ERR_PTR(-ENODEV);
1934                 return vport;
1935         } else
1936                 return ERR_PTR(-EINVAL);
1937
1938 }
1939
1940 /* Called with ovs_mutex */
1941 static void update_headroom(struct datapath *dp)
1942 {
1943         unsigned dev_headroom, max_headroom = 0;
1944         struct net_device *dev;
1945         struct vport *vport;
1946         int i;
1947
1948         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1949                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1950                         dev = vport->dev;
1951                         dev_headroom = netdev_get_fwd_headroom(dev);
1952                         if (dev_headroom > max_headroom)
1953                                 max_headroom = dev_headroom;
1954                 }
1955         }
1956
1957         dp->max_headroom = max_headroom;
1958         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1959                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1960                         netdev_set_rx_headroom(vport->dev, max_headroom);
1961 }
1962
1963 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1964 {
1965         struct nlattr **a = info->attrs;
1966         struct ovs_header *ovs_header = info->userhdr;
1967         struct vport_parms parms;
1968         struct sk_buff *reply;
1969         struct vport *vport;
1970         struct datapath *dp;
1971         u32 port_no;
1972         int err;
1973
1974         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1975             !a[OVS_VPORT_ATTR_UPCALL_PID])
1976                 return -EINVAL;
1977         if (a[OVS_VPORT_ATTR_IFINDEX])
1978                 return -EOPNOTSUPP;
1979
1980         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1981                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1982         if (port_no >= DP_MAX_PORTS)
1983                 return -EFBIG;
1984
1985         reply = ovs_vport_cmd_alloc_info();
1986         if (!reply)
1987                 return -ENOMEM;
1988
1989         ovs_lock();
1990 restart:
1991         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1992         err = -ENODEV;
1993         if (!dp)
1994                 goto exit_unlock_free;
1995
1996         if (port_no) {
1997                 vport = ovs_vport_ovsl(dp, port_no);
1998                 err = -EBUSY;
1999                 if (vport)
2000                         goto exit_unlock_free;
2001         } else {
2002                 for (port_no = 1; ; port_no++) {
2003                         if (port_no >= DP_MAX_PORTS) {
2004                                 err = -EFBIG;
2005                                 goto exit_unlock_free;
2006                         }
2007                         vport = ovs_vport_ovsl(dp, port_no);
2008                         if (!vport)
2009                                 break;
2010                 }
2011         }
2012
2013         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2014         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2015         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2016         parms.dp = dp;
2017         parms.port_no = port_no;
2018         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2019
2020         vport = new_vport(&parms);
2021         err = PTR_ERR(vport);
2022         if (IS_ERR(vport)) {
2023                 if (err == -EAGAIN)
2024                         goto restart;
2025                 goto exit_unlock_free;
2026         }
2027
2028         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2029                                       info->snd_portid, info->snd_seq, 0,
2030                                       OVS_VPORT_CMD_NEW);
2031
2032         if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2033                 update_headroom(dp);
2034         else
2035                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2036
2037         BUG_ON(err < 0);
2038         ovs_unlock();
2039
2040         ovs_notify(&dp_vport_genl_family, reply, info);
2041         return 0;
2042
2043 exit_unlock_free:
2044         ovs_unlock();
2045         kfree_skb(reply);
2046         return err;
2047 }
2048
2049 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2050 {
2051         struct nlattr **a = info->attrs;
2052         struct sk_buff *reply;
2053         struct vport *vport;
2054         int err;
2055
2056         reply = ovs_vport_cmd_alloc_info();
2057         if (!reply)
2058                 return -ENOMEM;
2059
2060         ovs_lock();
2061         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2062         err = PTR_ERR(vport);
2063         if (IS_ERR(vport))
2064                 goto exit_unlock_free;
2065
2066         if (a[OVS_VPORT_ATTR_TYPE] &&
2067             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2068                 err = -EINVAL;
2069                 goto exit_unlock_free;
2070         }
2071
2072         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2073                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2074                 if (err)
2075                         goto exit_unlock_free;
2076         }
2077
2078
2079         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2080                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2081
2082                 err = ovs_vport_set_upcall_portids(vport, ids);
2083                 if (err)
2084                         goto exit_unlock_free;
2085         }
2086
2087         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2088                                       info->snd_portid, info->snd_seq, 0,
2089                                       OVS_VPORT_CMD_NEW);
2090         BUG_ON(err < 0);
2091
2092         ovs_unlock();
2093         ovs_notify(&dp_vport_genl_family, reply, info);
2094         return 0;
2095
2096 exit_unlock_free:
2097         ovs_unlock();
2098         kfree_skb(reply);
2099         return err;
2100 }
2101
2102 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2103 {
2104         bool must_update_headroom = false;
2105         struct nlattr **a = info->attrs;
2106         struct sk_buff *reply;
2107         struct datapath *dp;
2108         struct vport *vport;
2109         int err;
2110
2111         reply = ovs_vport_cmd_alloc_info();
2112         if (!reply)
2113                 return -ENOMEM;
2114
2115         ovs_lock();
2116         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2117         err = PTR_ERR(vport);
2118         if (IS_ERR(vport))
2119                 goto exit_unlock_free;
2120
2121         if (vport->port_no == OVSP_LOCAL) {
2122                 err = -EINVAL;
2123                 goto exit_unlock_free;
2124         }
2125
2126         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2127                                       info->snd_portid, info->snd_seq, 0,
2128                                       OVS_VPORT_CMD_DEL);
2129         BUG_ON(err < 0);
2130
2131         /* the vport deletion may trigger dp headroom update */
2132         dp = vport->dp;
2133         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2134                 must_update_headroom = true;
2135         netdev_reset_rx_headroom(vport->dev);
2136         ovs_dp_detach_port(vport);
2137
2138         if (must_update_headroom)
2139                 update_headroom(dp);
2140         ovs_unlock();
2141
2142         ovs_notify(&dp_vport_genl_family, reply, info);
2143         return 0;
2144
2145 exit_unlock_free:
2146         ovs_unlock();
2147         kfree_skb(reply);
2148         return err;
2149 }
2150
2151 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2152 {
2153         struct nlattr **a = info->attrs;
2154         struct ovs_header *ovs_header = info->userhdr;
2155         struct sk_buff *reply;
2156         struct vport *vport;
2157         int err;
2158
2159         reply = ovs_vport_cmd_alloc_info();
2160         if (!reply)
2161                 return -ENOMEM;
2162
2163         rcu_read_lock();
2164         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2165         err = PTR_ERR(vport);
2166         if (IS_ERR(vport))
2167                 goto exit_unlock_free;
2168         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2169                                       info->snd_portid, info->snd_seq, 0,
2170                                       OVS_VPORT_CMD_NEW);
2171         BUG_ON(err < 0);
2172         rcu_read_unlock();
2173
2174         return genlmsg_reply(reply, info);
2175
2176 exit_unlock_free:
2177         rcu_read_unlock();
2178         kfree_skb(reply);
2179         return err;
2180 }
2181
2182 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2183 {
2184         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2185         struct datapath *dp;
2186         int bucket = cb->args[0], skip = cb->args[1];
2187         int i, j = 0;
2188
2189         rcu_read_lock();
2190         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2191         if (!dp) {
2192                 rcu_read_unlock();
2193                 return -ENODEV;
2194         }
2195         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2196                 struct vport *vport;
2197
2198                 j = 0;
2199                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2200                         if (j >= skip &&
2201                             ovs_vport_cmd_fill_info(vport, skb,
2202                                                     sock_net(skb->sk),
2203                                                     NETLINK_CB(cb->skb).portid,
2204                                                     cb->nlh->nlmsg_seq,
2205                                                     NLM_F_MULTI,
2206                                                     OVS_VPORT_CMD_NEW) < 0)
2207                                 goto out;
2208
2209                         j++;
2210                 }
2211                 skip = 0;
2212         }
2213 out:
2214         rcu_read_unlock();
2215
2216         cb->args[0] = i;
2217         cb->args[1] = j;
2218
2219         return skb->len;
2220 }
2221
2222 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2223         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2224         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2225         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2226         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2227         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2228         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2229         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2230         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2231 };
2232
2233 static const struct genl_ops dp_vport_genl_ops[] = {
2234         { .cmd = OVS_VPORT_CMD_NEW,
2235           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2236           .policy = vport_policy,
2237           .doit = ovs_vport_cmd_new
2238         },
2239         { .cmd = OVS_VPORT_CMD_DEL,
2240           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2241           .policy = vport_policy,
2242           .doit = ovs_vport_cmd_del
2243         },
2244         { .cmd = OVS_VPORT_CMD_GET,
2245           .flags = 0,               /* OK for unprivileged users. */
2246           .policy = vport_policy,
2247           .doit = ovs_vport_cmd_get,
2248           .dumpit = ovs_vport_cmd_dump
2249         },
2250         { .cmd = OVS_VPORT_CMD_SET,
2251           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2252           .policy = vport_policy,
2253           .doit = ovs_vport_cmd_set,
2254         },
2255 };
2256
2257 struct genl_family dp_vport_genl_family __ro_after_init = {
2258         .hdrsize = sizeof(struct ovs_header),
2259         .name = OVS_VPORT_FAMILY,
2260         .version = OVS_VPORT_VERSION,
2261         .maxattr = OVS_VPORT_ATTR_MAX,
2262         .netnsok = true,
2263         .parallel_ops = true,
2264         .ops = dp_vport_genl_ops,
2265         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2266         .mcgrps = &ovs_dp_vport_multicast_group,
2267         .n_mcgrps = 1,
2268         .module = THIS_MODULE,
2269 };
2270
2271 static struct genl_family * const dp_genl_families[] = {
2272         &dp_datapath_genl_family,
2273         &dp_vport_genl_family,
2274         &dp_flow_genl_family,
2275         &dp_packet_genl_family,
2276         &dp_meter_genl_family,
2277 };
2278
2279 static void dp_unregister_genl(int n_families)
2280 {
2281         int i;
2282
2283         for (i = 0; i < n_families; i++)
2284                 genl_unregister_family(dp_genl_families[i]);
2285 }
2286
2287 static int __init dp_register_genl(void)
2288 {
2289         int err;
2290         int i;
2291
2292         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2293
2294                 err = genl_register_family(dp_genl_families[i]);
2295                 if (err)
2296                         goto error;
2297         }
2298
2299         return 0;
2300
2301 error:
2302         dp_unregister_genl(i);
2303         return err;
2304 }
2305
2306 static int __net_init ovs_init_net(struct net *net)
2307 {
2308         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2309
2310         INIT_LIST_HEAD(&ovs_net->dps);
2311         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2312         ovs_ct_init(net);
2313         return 0;
2314 }
2315
2316 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2317                                             struct list_head *head)
2318 {
2319         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2320         struct datapath *dp;
2321
2322         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2323                 int i;
2324
2325                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2326                         struct vport *vport;
2327
2328                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2329                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2330                                         continue;
2331
2332                                 if (dev_net(vport->dev) == dnet)
2333                                         list_add(&vport->detach_list, head);
2334                         }
2335                 }
2336         }
2337 }
2338
2339 static void __net_exit ovs_exit_net(struct net *dnet)
2340 {
2341         struct datapath *dp, *dp_next;
2342         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2343         struct vport *vport, *vport_next;
2344         struct net *net;
2345         LIST_HEAD(head);
2346
2347         ovs_ct_exit(dnet);
2348         ovs_lock();
2349         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2350                 __dp_destroy(dp);
2351
2352         rtnl_lock();
2353         for_each_net(net)
2354                 list_vports_from_net(net, dnet, &head);
2355         rtnl_unlock();
2356
2357         /* Detach all vports from given namespace. */
2358         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2359                 list_del(&vport->detach_list);
2360                 ovs_dp_detach_port(vport);
2361         }
2362
2363         ovs_unlock();
2364
2365         cancel_work_sync(&ovs_net->dp_notify_work);
2366 }
2367
2368 static struct pernet_operations ovs_net_ops = {
2369         .init = ovs_init_net,
2370         .exit = ovs_exit_net,
2371         .id   = &ovs_net_id,
2372         .size = sizeof(struct ovs_net),
2373 };
2374
2375 static int __init dp_init(void)
2376 {
2377         int err;
2378
2379         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2380
2381         pr_info("Open vSwitch switching datapath\n");
2382
2383         err = action_fifos_init();
2384         if (err)
2385                 goto error;
2386
2387         err = ovs_internal_dev_rtnl_link_register();
2388         if (err)
2389                 goto error_action_fifos_exit;
2390
2391         err = ovs_flow_init();
2392         if (err)
2393                 goto error_unreg_rtnl_link;
2394
2395         err = ovs_vport_init();
2396         if (err)
2397                 goto error_flow_exit;
2398
2399         err = register_pernet_device(&ovs_net_ops);
2400         if (err)
2401                 goto error_vport_exit;
2402
2403         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2404         if (err)
2405                 goto error_netns_exit;
2406
2407         err = ovs_netdev_init();
2408         if (err)
2409                 goto error_unreg_notifier;
2410
2411         err = dp_register_genl();
2412         if (err < 0)
2413                 goto error_unreg_netdev;
2414
2415         return 0;
2416
2417 error_unreg_netdev:
2418         ovs_netdev_exit();
2419 error_unreg_notifier:
2420         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2421 error_netns_exit:
2422         unregister_pernet_device(&ovs_net_ops);
2423 error_vport_exit:
2424         ovs_vport_exit();
2425 error_flow_exit:
2426         ovs_flow_exit();
2427 error_unreg_rtnl_link:
2428         ovs_internal_dev_rtnl_link_unregister();
2429 error_action_fifos_exit:
2430         action_fifos_exit();
2431 error:
2432         return err;
2433 }
2434
2435 static void dp_cleanup(void)
2436 {
2437         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2438         ovs_netdev_exit();
2439         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2440         unregister_pernet_device(&ovs_net_ops);
2441         rcu_barrier();
2442         ovs_vport_exit();
2443         ovs_flow_exit();
2444         ovs_internal_dev_rtnl_link_unregister();
2445         action_fifos_exit();
2446 }
2447
2448 module_init(dp_init);
2449 module_exit(dp_cleanup);
2450
2451 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2452 MODULE_LICENSE("GPL");
2453 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2454 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2455 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2456 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2457 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);