datapath/datapath.c

   1 /*
   2  * Copyright (c) 2007-2013 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/version.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/wait.h>
  42 #include <asm/div64.h>
  43 #include <linux/highmem.h>
  44 #include <linux/netfilter_bridge.h>
  45 #include <linux/netfilter_ipv4.h>
  46 #include <linux/inetdevice.h>
  47 #include <linux/list.h>
  48 #include <linux/openvswitch.h>
  49 #include <linux/rculist.h>
  50 #include <linux/dmi.h>
  51 #include <linux/genetlink.h>
  52 #include <net/genetlink.h>
  53 #include <net/genetlink.h>
  54 #include <net/net_namespace.h>
  55 #include <net/netns/generic.h>
  56
  57 #include "checksum.h"
  58 #include "datapath.h"
  59 #include "flow.h"
  60 #include "vlan.h"
  61 #include "vport-internal_dev.h"
  62 #include "vport-netdev.h"
  63
  64 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
  65     LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
  66 #error Kernels before 2.6.18 or after 3.9 are not supported by this version of Open vSwitch.
  67 #endif
  68
  69 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
  70 static void rehash_flow_table(struct work_struct *work);
  71 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
  72
  73 int ovs_net_id __read_mostly;
  74
  75 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
  76                        struct genl_multicast_group *grp)
  77 {
  78         genl_notify(skb, genl_info_net(info), info->snd_portid,
  79                     grp->id, info->nlhdr, GFP_KERNEL);
  80 }
  81
  82 /**
  83  * DOC: Locking:
  84  *
  85  * All writes e.g. Writes to device state (add/remove datapath, port, set
  86  * operations on vports, etc.), Writes to other state (flow table
  87  * modifications, set miscellaneous datapath parameters, etc.) are protected
  88  * by ovs_lock.
  89  *
  90  * Reads are protected by RCU.
  91  *
  92  * There are a few special cases (mostly stats) that have their own
  93  * synchronization but they nest under all of above and don't interact with
  94  * each other.
  95  *
  96  * The RTNL lock nests inside ovs_mutex.
  97  */
  98
  99 static DEFINE_MUTEX(ovs_mutex);
 100
 101 void ovs_lock(void)
 102 {
 103         mutex_lock(&ovs_mutex);
 104 }
 105
 106 void ovs_unlock(void)
 107 {
 108         mutex_unlock(&ovs_mutex);
 109 }
 110
 111 #ifdef CONFIG_LOCKDEP
 112 int lockdep_ovsl_is_held(void)
 113 {
 114         if (debug_locks)
 115                 return lockdep_is_held(&ovs_mutex);
 116         else
 117                 return 1;
 118 }
 119 #endif
 120
 121 static struct vport *new_vport(const struct vport_parms *);
 122 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
 123                              const struct dp_upcall_info *);
 124 static int queue_userspace_packet(struct net *, int dp_ifindex,
 125                                   struct sk_buff *,
 126                                   const struct dp_upcall_info *);
 127
 128 /* Must be called with rcu_read_lock or ovs_mutex. */
 129 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 130 {
 131         struct datapath *dp = NULL;
 132         struct net_device *dev;
 133
 134         rcu_read_lock();
 135         dev = dev_get_by_index_rcu(net, dp_ifindex);
 136         if (dev) {
 137                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 138                 if (vport)
 139                         dp = vport->dp;
 140         }
 141         rcu_read_unlock();
 142
 143         return dp;
 144 }
 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 vport->ops->get_name(vport);
 151 }
 152
 153 static int get_dpifindex(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 = netdev_vport_priv(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((__force struct flow_table *)dp->table, false);
 176         free_percpu(dp->stats_percpu);
 177         release_net(ovs_dp_get_net(dp));
 178         kfree(dp->ports);
 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 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 189 {
 190         struct vport *vport;
 191         struct hlist_head *head;
 192
 193         head = vport_hash_bucket(dp, port_no);
 194         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 195                 if (vport->port_no == port_no)
 196                         return vport;
 197         }
 198         return NULL;
 199 }
 200
 201 /* Called with ovs_mutex. */
 202 static struct vport *new_vport(const struct vport_parms *parms)
 203 {
 204         struct vport *vport;
 205
 206         vport = ovs_vport_add(parms);
 207         if (!IS_ERR(vport)) {
 208                 struct datapath *dp = parms->dp;
 209                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 210
 211                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 212         }
 213         return vport;
 214 }
 215
 216 void ovs_dp_detach_port(struct vport *p)
 217 {
 218         ASSERT_OVSL();
 219
 220         /* First drop references to device. */
 221         hlist_del_rcu(&p->dp_hash_node);
 222
 223         /* Then destroy it. */
 224         ovs_vport_del(p);
 225 }
 226
 227 /* Must be called with rcu_read_lock. */
 228 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 229 {
 230         struct datapath *dp = p->dp;
 231         struct sw_flow *flow;
 232         struct dp_stats_percpu *stats;
 233         struct sw_flow_key key;
 234         u64 *stats_counter;
 235         int error;
 236
 237         stats = this_cpu_ptr(dp->stats_percpu);
 238
 239         /* Extract flow from 'skb' into 'key'. */
 240         error = ovs_flow_extract(skb, p->port_no, &key);
 241         if (unlikely(error)) {
 242                 kfree_skb(skb);
 243                 return;
 244         }
 245
 246         /* Look up flow. */
 247         flow = ovs_flow_lookup(rcu_dereference(dp->table), &key);
 248         if (unlikely(!flow)) {
 249                 struct dp_upcall_info upcall;
 250
 251                 upcall.cmd = OVS_PACKET_CMD_MISS;
 252                 upcall.key = &key;
 253                 upcall.userdata = NULL;
 254                 upcall.portid = p->upcall_portid;
 255                 ovs_dp_upcall(dp, skb, &upcall);
 256                 consume_skb(skb);
 257                 stats_counter = &stats->n_missed;
 258                 goto out;
 259         }
 260
 261         OVS_CB(skb)->flow = flow;
 262         OVS_CB(skb)->pkt_key = &key;
 263
 264         stats_counter = &stats->n_hit;
 265         ovs_flow_used(OVS_CB(skb)->flow, skb);
 266         ovs_execute_actions(dp, skb);
 267
 268 out:
 269         /* Update datapath statistics. */
 270         u64_stats_update_begin(&stats->sync);
 271         (*stats_counter)++;
 272         u64_stats_update_end(&stats->sync);
 273 }
 274
 275 static struct genl_family dp_packet_genl_family = {
 276         .id = GENL_ID_GENERATE,
 277         .hdrsize = sizeof(struct ovs_header),
 278         .name = OVS_PACKET_FAMILY,
 279         .version = OVS_PACKET_VERSION,
 280         .maxattr = OVS_PACKET_ATTR_MAX,
 281          SET_NETNSOK
 282          SET_PARALLEL_OPS
 283 };
 284
 285 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 286                   const struct dp_upcall_info *upcall_info)
 287 {
 288         struct dp_stats_percpu *stats;
 289         int dp_ifindex;
 290         int err;
 291
 292         if (upcall_info->portid == 0) {
 293                 err = -ENOTCONN;
 294                 goto err;
 295         }
 296
 297         dp_ifindex = get_dpifindex(dp);
 298         if (!dp_ifindex) {
 299                 err = -ENODEV;
 300                 goto err;
 301         }
 302
 303         forward_ip_summed(skb, true);
 304
 305         if (!skb_is_gso(skb))
 306                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 307         else
 308                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 309         if (err)
 310                 goto err;
 311
 312         return 0;
 313
 314 err:
 315         stats = this_cpu_ptr(dp->stats_percpu);
 316
 317         u64_stats_update_begin(&stats->sync);
 318         stats->n_lost++;
 319         u64_stats_update_end(&stats->sync);
 320
 321         return err;
 322 }
 323
 324 static int queue_gso_packets(struct net *net, int dp_ifindex,
 325                              struct sk_buff *skb,
 326                              const struct dp_upcall_info *upcall_info)
 327 {
 328         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 329         struct dp_upcall_info later_info;
 330         struct sw_flow_key later_key;
 331         struct sk_buff *segs, *nskb;
 332         int err;
 333
 334         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 335         if (IS_ERR(segs))
 336                 return PTR_ERR(segs);
 337
 338         /* Queue all of the segments. */
 339         skb = segs;
 340         do {
 341                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 342                 if (err)
 343                         break;
 344
 345                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 346                         /* The initial flow key extracted by ovs_flow_extract()
 347                          * in this case is for a first fragment, so we need to
 348                          * properly mark later fragments.
 349                          */
 350                         later_key = *upcall_info->key;
 351                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 352
 353                         later_info = *upcall_info;
 354                         later_info.key = &later_key;
 355                         upcall_info = &later_info;
 356                 }
 357         } while ((skb = skb->next));
 358
 359         /* Free all of the segments. */
 360         skb = segs;
 361         do {
 362                 nskb = skb->next;
 363                 if (err)
 364                         kfree_skb(skb);
 365                 else
 366                         consume_skb(skb);
 367         } while ((skb = nskb));
 368         return err;
 369 }
 370
 371 static size_t key_attr_size(void)
 372 {
 373         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 374                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 375                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 376                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 377                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 378                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 379                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 380                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 381                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 382                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 383                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 384                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 385                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 386                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 387                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 388                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 389                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 390                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 391                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 392 }
 393
 394 static size_t upcall_msg_size(const struct sk_buff *skb,
 395                               const struct nlattr *userdata)
 396 {
 397         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 398                 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
 399                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 400
 401         /* OVS_PACKET_ATTR_USERDATA */
 402         if (userdata)
 403                 size += NLA_ALIGN(userdata->nla_len);
 404
 405         return size;
 406 }
 407
 408 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 409                                   struct sk_buff *skb,
 410                                   const struct dp_upcall_info *upcall_info)
 411 {
 412         struct ovs_header *upcall;
 413         struct sk_buff *nskb = NULL;
 414         struct sk_buff *user_skb; /* to be queued to userspace */
 415         struct nlattr *nla;
 416         int err;
 417
 418         if (vlan_tx_tag_present(skb)) {
 419                 nskb = skb_clone(skb, GFP_ATOMIC);
 420                 if (!nskb)
 421                         return -ENOMEM;
 422
 423                 err = vlan_deaccel_tag(nskb);
 424                 if (err)
 425                         return err;
 426
 427                 skb = nskb;
 428         }
 429
 430         if (nla_attr_size(skb->len) > USHRT_MAX) {
 431                 err = -EFBIG;
 432                 goto out;
 433         }
 434
 435         user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
 436         if (!user_skb) {
 437                 err = -ENOMEM;
 438                 goto out;
 439         }
 440
 441         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 442                              0, upcall_info->cmd);
 443         upcall->dp_ifindex = dp_ifindex;
 444
 445         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 446         ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb);
 447         nla_nest_end(user_skb, nla);
 448
 449         if (upcall_info->userdata)
 450                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 451                           nla_len(upcall_info->userdata),
 452                           nla_data(upcall_info->userdata));
 453
 454         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 455
 456         skb_copy_and_csum_dev(skb, nla_data(nla));
 457
 458         genlmsg_end(user_skb, upcall);
 459         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 460
 461 out:
 462         kfree_skb(nskb);
 463         return err;
 464 }
 465
 466 /* Called with ovs_mutex. */
 467 static int flush_flows(struct datapath *dp)
 468 {
 469         struct flow_table *old_table;
 470         struct flow_table *new_table;
 471
 472         old_table = ovsl_dereference(dp->table);
 473         new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
 474         if (!new_table)
 475                 return -ENOMEM;
 476
 477         rcu_assign_pointer(dp->table, new_table);
 478
 479         ovs_flow_tbl_destroy(old_table, true);
 480         return 0;
 481 }
 482
 483 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
 484 {
 485
 486         struct sw_flow_actions *acts;
 487         int new_acts_size;
 488         int req_size = NLA_ALIGN(attr_len);
 489         int next_offset = offsetof(struct sw_flow_actions, actions) +
 490                                         (*sfa)->actions_len;
 491
 492         if (req_size <= (ksize(*sfa) - next_offset))
 493                 goto out;
 494
 495         new_acts_size = ksize(*sfa) * 2;
 496
 497         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
 498                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
 499                         return ERR_PTR(-EMSGSIZE);
 500                 new_acts_size = MAX_ACTIONS_BUFSIZE;
 501         }
 502
 503         acts = ovs_flow_actions_alloc(new_acts_size);
 504         if (IS_ERR(acts))
 505                 return (void *)acts;
 506
 507         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
 508         acts->actions_len = (*sfa)->actions_len;
 509         kfree(*sfa);
 510         *sfa = acts;
 511
 512 out:
 513         (*sfa)->actions_len += req_size;
 514         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
 515 }
 516
 517 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
 518 {
 519         struct nlattr *a;
 520
 521         a = reserve_sfa_size(sfa, nla_attr_size(len));
 522         if (IS_ERR(a))
 523                 return PTR_ERR(a);
 524
 525         a->nla_type = attrtype;
 526         a->nla_len = nla_attr_size(len);
 527
 528         if (data)
 529                 memcpy(nla_data(a), data, len);
 530         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
 531
 532         return 0;
 533 }
 534
 535 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
 536 {
 537         int used = (*sfa)->actions_len;
 538         int err;
 539
 540         err = add_action(sfa, attrtype, NULL, 0);
 541         if (err)
 542                 return err;
 543
 544         return used;
 545 }
 546
 547 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
 548 {
 549         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
 550
 551         a->nla_len = sfa->actions_len - st_offset;
 552 }
 553
 554 static int validate_and_copy_actions(const struct nlattr *attr,
 555                                 const struct sw_flow_key *key, int depth,
 556                                 struct sw_flow_actions **sfa);
 557
 558 static int validate_and_copy_sample(const struct nlattr *attr,
 559                            const struct sw_flow_key *key, int depth,
 560                            struct sw_flow_actions **sfa)
 561 {
 562         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
 563         const struct nlattr *probability, *actions;
 564         const struct nlattr *a;
 565         int rem, start, err, st_acts;
 566
 567         memset(attrs, 0, sizeof(attrs));
 568         nla_for_each_nested(a, attr, rem) {
 569                 int type = nla_type(a);
 570                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
 571                         return -EINVAL;
 572                 attrs[type] = a;
 573         }
 574         if (rem)
 575                 return -EINVAL;
 576
 577         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
 578         if (!probability || nla_len(probability) != sizeof(u32))
 579                 return -EINVAL;
 580
 581         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
 582         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
 583                 return -EINVAL;
 584
 585         /* validation done, copy sample action. */
 586         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
 587         if (start < 0)
 588                 return start;
 589         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
 590         if (err)
 591                 return err;
 592         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
 593         if (st_acts < 0)
 594                 return st_acts;
 595
 596         err = validate_and_copy_actions(actions, key, depth + 1, sfa);
 597         if (err)
 598                 return err;
 599
 600         add_nested_action_end(*sfa, st_acts);
 601         add_nested_action_end(*sfa, start);
 602
 603         return 0;
 604 }
 605
 606 static int validate_tp_port(const struct sw_flow_key *flow_key)
 607 {
 608         if (flow_key->eth.type == htons(ETH_P_IP)) {
 609                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
 610                         return 0;
 611         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
 612                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
 613                         return 0;
 614         }
 615
 616         return -EINVAL;
 617 }
 618
 619 static int validate_and_copy_set_tun(const struct nlattr *attr,
 620                                      struct sw_flow_actions **sfa)
 621 {
 622         struct sw_flow_match match;
 623         struct sw_flow_key key;
 624         int err, start;
 625
 626         ovs_match_init(&match, &key, NULL);
 627         err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false);
 628         if (err)
 629                 return err;
 630
 631         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
 632         if (start < 0)
 633                 return start;
 634
 635         err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
 636                         sizeof(match.key->tun_key));
 637         add_nested_action_end(*sfa, start);
 638
 639         return err;
 640 }
 641
 642 static int validate_set(const struct nlattr *a,
 643                         const struct sw_flow_key *flow_key,
 644                         struct sw_flow_actions **sfa,
 645                         bool *set_tun)
 646 {
 647         const struct nlattr *ovs_key = nla_data(a);
 648         int key_type = nla_type(ovs_key);
 649
 650         /* There can be only one key in a action */
 651         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
 652                 return -EINVAL;
 653
 654         if (key_type > OVS_KEY_ATTR_MAX ||
 655             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
 656              ovs_key_lens[key_type] != -1))
 657                 return -EINVAL;
 658
 659         switch (key_type) {
 660         const struct ovs_key_ipv4 *ipv4_key;
 661         const struct ovs_key_ipv6 *ipv6_key;
 662         int err;
 663
 664         case OVS_KEY_ATTR_PRIORITY:
 665         case OVS_KEY_ATTR_ETHERNET:
 666                 break;
 667
 668         case OVS_KEY_ATTR_SKB_MARK:
 669 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
 670                 if (nla_get_u32(ovs_key) != 0)
 671                         return -EINVAL;
 672 #endif
 673                 break;
 674
 675         case OVS_KEY_ATTR_TUNNEL:
 676                 *set_tun = true;
 677                 err = validate_and_copy_set_tun(a, sfa);
 678                 if (err)
 679                         return err;
 680                 break;
 681
 682         case OVS_KEY_ATTR_IPV4:
 683                 if (flow_key->eth.type != htons(ETH_P_IP))
 684                         return -EINVAL;
 685
 686                 if (!flow_key->ip.proto)
 687                         return -EINVAL;
 688
 689                 ipv4_key = nla_data(ovs_key);
 690                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
 691                         return -EINVAL;
 692
 693                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
 694                         return -EINVAL;
 695
 696                 break;
 697
 698         case OVS_KEY_ATTR_IPV6:
 699                 if (flow_key->eth.type != htons(ETH_P_IPV6))
 700                         return -EINVAL;
 701
 702                 if (!flow_key->ip.proto)
 703                         return -EINVAL;
 704
 705                 ipv6_key = nla_data(ovs_key);
 706                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
 707                         return -EINVAL;
 708
 709                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
 710                         return -EINVAL;
 711
 712                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
 713                         return -EINVAL;
 714
 715                 break;
 716
 717         case OVS_KEY_ATTR_TCP:
 718                 if (flow_key->ip.proto != IPPROTO_TCP)
 719                         return -EINVAL;
 720
 721                 return validate_tp_port(flow_key);
 722
 723         case OVS_KEY_ATTR_UDP:
 724                 if (flow_key->ip.proto != IPPROTO_UDP)
 725                         return -EINVAL;
 726
 727                 return validate_tp_port(flow_key);
 728
 729         default:
 730                 return -EINVAL;
 731         }
 732
 733         return 0;
 734 }
 735
 736 static int validate_userspace(const struct nlattr *attr)
 737 {
 738         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
 739                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
 740                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
 741         };
 742         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 743         int error;
 744
 745         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
 746                                  attr, userspace_policy);
 747         if (error)
 748                 return error;
 749
 750         if (!a[OVS_USERSPACE_ATTR_PID] ||
 751             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
 752                 return -EINVAL;
 753
 754         return 0;
 755 }
 756
 757 static int copy_action(const struct nlattr *from,
 758                       struct sw_flow_actions **sfa)
 759 {
 760         int totlen = NLA_ALIGN(from->nla_len);
 761         struct nlattr *to;
 762
 763         to = reserve_sfa_size(sfa, from->nla_len);
 764         if (IS_ERR(to))
 765                 return PTR_ERR(to);
 766
 767         memcpy(to, from, totlen);
 768         return 0;
 769 }
 770
 771 static int validate_and_copy_actions(const struct nlattr *attr,
 772                                 const struct sw_flow_key *key,
 773                                 int depth,
 774                                 struct sw_flow_actions **sfa)
 775 {
 776         const struct nlattr *a;
 777         int rem, err;
 778
 779         if (depth >= SAMPLE_ACTION_DEPTH)
 780                 return -EOVERFLOW;
 781
 782         nla_for_each_nested(a, attr, rem) {
 783                 /* Expected argument lengths, (u32)-1 for variable length. */
 784                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 785                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
 786                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 787                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 788                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
 789                         [OVS_ACTION_ATTR_SET] = (u32)-1,
 790                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
 791                 };
 792                 const struct ovs_action_push_vlan *vlan;
 793                 int type = nla_type(a);
 794                 bool skip_copy;
 795
 796                 if (type > OVS_ACTION_ATTR_MAX ||
 797                     (action_lens[type] != nla_len(a) &&
 798                      action_lens[type] != (u32)-1))
 799                         return -EINVAL;
 800
 801                 skip_copy = false;
 802                 switch (type) {
 803                 case OVS_ACTION_ATTR_UNSPEC:
 804                         return -EINVAL;
 805
 806                 case OVS_ACTION_ATTR_USERSPACE:
 807                         err = validate_userspace(a);
 808                         if (err)
 809                                 return err;
 810                         break;
 811
 812                 case OVS_ACTION_ATTR_OUTPUT:
 813                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 814                                 return -EINVAL;
 815                         break;
 816
 817
 818                 case OVS_ACTION_ATTR_POP_VLAN:
 819                         break;
 820
 821                 case OVS_ACTION_ATTR_PUSH_VLAN:
 822                         vlan = nla_data(a);
 823                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
 824                                 return -EINVAL;
 825                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 826                                 return -EINVAL;
 827                         break;
 828
 829                 case OVS_ACTION_ATTR_SET:
 830                         err = validate_set(a, key, sfa, &skip_copy);
 831                         if (err)
 832                                 return err;
 833                         break;
 834
 835                 case OVS_ACTION_ATTR_SAMPLE:
 836                         err = validate_and_copy_sample(a, key, depth, sfa);
 837                         if (err)
 838                                 return err;
 839                         skip_copy = true;
 840                         break;
 841
 842                 default:
 843                         return -EINVAL;
 844                 }
 845                 if (!skip_copy) {
 846                         err = copy_action(a, sfa);
 847                         if (err)
 848                                 return err;
 849                 }
 850         }
 851
 852         if (rem > 0)
 853                 return -EINVAL;
 854
 855         return 0;
 856 }
 857
 858 static void clear_stats(struct sw_flow *flow)
 859 {
 860         flow->used = 0;
 861         flow->tcp_flags = 0;
 862         flow->packet_count = 0;
 863         flow->byte_count = 0;
 864 }
 865
 866 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 867 {
 868         struct ovs_header *ovs_header = info->userhdr;
 869         struct nlattr **a = info->attrs;
 870         struct sw_flow_actions *acts;
 871         struct sk_buff *packet;
 872         struct sw_flow *flow;
 873         struct datapath *dp;
 874         struct ethhdr *eth;
 875         int len;
 876         int err;
 877
 878         err = -EINVAL;
 879         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 880             !a[OVS_PACKET_ATTR_ACTIONS])
 881                 goto err;
 882
 883         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 884         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 885         err = -ENOMEM;
 886         if (!packet)
 887                 goto err;
 888         skb_reserve(packet, NET_IP_ALIGN);
 889
 890         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 891
 892         skb_reset_mac_header(packet);
 893         eth = eth_hdr(packet);
 894
 895         /* Normally, setting the skb 'protocol' field would be handled by a
 896          * call to eth_type_trans(), but it assumes there's a sending
 897          * device, which we may not have. */
 898         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 899                 packet->protocol = eth->h_proto;
 900         else
 901                 packet->protocol = htons(ETH_P_802_2);
 902
 903         /* Build an sw_flow for sending this packet. */
 904         flow = ovs_flow_alloc();
 905         err = PTR_ERR(flow);
 906         if (IS_ERR(flow))
 907                 goto err_kfree_skb;
 908
 909         err = ovs_flow_extract(packet, -1, &flow->key);
 910         if (err)
 911                 goto err_flow_free;
 912
 913         err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
 914         if (err)
 915                 goto err_flow_free;
 916         acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 917         err = PTR_ERR(acts);
 918         if (IS_ERR(acts))
 919                 goto err_flow_free;
 920
 921         err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
 922         rcu_assign_pointer(flow->sf_acts, acts);
 923         if (err)
 924                 goto err_flow_free;
 925
 926         OVS_CB(packet)->flow = flow;
 927         OVS_CB(packet)->pkt_key = &flow->key;
 928         packet->priority = flow->key.phy.priority;
 929         skb_set_mark(packet, flow->key.phy.skb_mark);
 930
 931         rcu_read_lock();
 932         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 933         err = -ENODEV;
 934         if (!dp)
 935                 goto err_unlock;
 936
 937         local_bh_disable();
 938         err = ovs_execute_actions(dp, packet);
 939         local_bh_enable();
 940         rcu_read_unlock();
 941
 942         ovs_flow_free(flow, false);
 943         return err;
 944
 945 err_unlock:
 946         rcu_read_unlock();
 947 err_flow_free:
 948         ovs_flow_free(flow, false);
 949 err_kfree_skb:
 950         kfree_skb(packet);
 951 err:
 952         return err;
 953 }
 954
 955 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 956 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
 957         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 958 #else
 959         [OVS_PACKET_ATTR_PACKET] = { .minlen = ETH_HLEN },
 960 #endif
 961         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 962         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 963 };
 964
 965 static struct genl_ops dp_packet_genl_ops[] = {
 966         { .cmd = OVS_PACKET_CMD_EXECUTE,
 967           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 968           .policy = packet_policy,
 969           .doit = ovs_packet_cmd_execute
 970         }
 971 };
 972
 973 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 974 {
 975         struct flow_table *table;
 976         int i;
 977
 978         table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
 979         stats->n_flows = ovs_flow_tbl_count(table);
 980
 981         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 982         for_each_possible_cpu(i) {
 983                 const struct dp_stats_percpu *percpu_stats;
 984                 struct dp_stats_percpu local_stats;
 985                 unsigned int start;
 986
 987                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 988
 989                 do {
 990                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 991                         local_stats = *percpu_stats;
 992                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 993
 994                 stats->n_hit += local_stats.n_hit;
 995                 stats->n_missed += local_stats.n_missed;
 996                 stats->n_lost += local_stats.n_lost;
 997         }
 998 }
 999
1000 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1001         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1002         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1003         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1004 };
1005
1006 static struct genl_family dp_flow_genl_family = {
1007         .id = GENL_ID_GENERATE,
1008         .hdrsize = sizeof(struct ovs_header),
1009         .name = OVS_FLOW_FAMILY,
1010         .version = OVS_FLOW_VERSION,
1011         .maxattr = OVS_FLOW_ATTR_MAX,
1012          SET_NETNSOK
1013          SET_PARALLEL_OPS
1014 };
1015
1016 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
1017         .name = OVS_FLOW_MCGROUP
1018 };
1019
1020 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
1021 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1022 {
1023         const struct nlattr *a;
1024         struct nlattr *start;
1025         int err = 0, rem;
1026
1027         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1028         if (!start)
1029                 return -EMSGSIZE;
1030
1031         nla_for_each_nested(a, attr, rem) {
1032                 int type = nla_type(a);
1033                 struct nlattr *st_sample;
1034
1035                 switch (type) {
1036                 case OVS_SAMPLE_ATTR_PROBABILITY:
1037                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1038                                 return -EMSGSIZE;
1039                         break;
1040                 case OVS_SAMPLE_ATTR_ACTIONS:
1041                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1042                         if (!st_sample)
1043                                 return -EMSGSIZE;
1044                         err = actions_to_attr(nla_data(a), nla_len(a), skb);
1045                         if (err)
1046                                 return err;
1047                         nla_nest_end(skb, st_sample);
1048                         break;
1049                 }
1050         }
1051
1052         nla_nest_end(skb, start);
1053         return err;
1054 }
1055
1056 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1057 {
1058         const struct nlattr *ovs_key = nla_data(a);
1059         int key_type = nla_type(ovs_key);
1060         struct nlattr *start;
1061         int err;
1062
1063         switch (key_type) {
1064         case OVS_KEY_ATTR_IPV4_TUNNEL:
1065                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1066                 if (!start)
1067                         return -EMSGSIZE;
1068
1069                 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1070                                              nla_data(ovs_key));
1071                 if (err)
1072                         return err;
1073                 nla_nest_end(skb, start);
1074                 break;
1075         default:
1076                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1077                         return -EMSGSIZE;
1078                 break;
1079         }
1080
1081         return 0;
1082 }
1083
1084 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1085 {
1086         const struct nlattr *a;
1087         int rem, err;
1088
1089         nla_for_each_attr(a, attr, len, rem) {
1090                 int type = nla_type(a);
1091
1092                 switch (type) {
1093                 case OVS_ACTION_ATTR_SET:
1094                         err = set_action_to_attr(a, skb);
1095                         if (err)
1096                                 return err;
1097                         break;
1098
1099                 case OVS_ACTION_ATTR_SAMPLE:
1100                         err = sample_action_to_attr(a, skb);
1101                         if (err)
1102                                 return err;
1103                         break;
1104                 default:
1105                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1106                                 return -EMSGSIZE;
1107                         break;
1108                 }
1109         }
1110
1111         return 0;
1112 }
1113
1114 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1115 {
1116         return NLMSG_ALIGN(sizeof(struct ovs_header))
1117                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1118                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
1119                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1120                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1121                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1122                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1123 }
1124
1125 /* Called with ovs_mutex. */
1126 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1127                                   struct sk_buff *skb, u32 portid,
1128                                   u32 seq, u32 flags, u8 cmd)
1129 {
1130         const int skb_orig_len = skb->len;
1131         struct nlattr *start;
1132         struct ovs_flow_stats stats;
1133         struct ovs_header *ovs_header;
1134         struct nlattr *nla;
1135         unsigned long used;
1136         u8 tcp_flags;
1137         int err;
1138
1139         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1140         if (!ovs_header)
1141                 return -EMSGSIZE;
1142
1143         ovs_header->dp_ifindex = get_dpifindex(dp);
1144
1145         /* Fill flow key. */
1146         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1147         if (!nla)
1148                 goto nla_put_failure;
1149
1150         err = ovs_flow_to_nlattrs(&flow->unmasked_key,
1151                         &flow->unmasked_key, skb);
1152         if (err)
1153                 goto error;
1154         nla_nest_end(skb, nla);
1155
1156         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
1157         if (!nla)
1158                 goto nla_put_failure;
1159
1160         err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb);
1161         if (err)
1162                 goto error;
1163
1164         nla_nest_end(skb, nla);
1165
1166         spin_lock_bh(&flow->lock);
1167         used = flow->used;
1168         stats.n_packets = flow->packet_count;
1169         stats.n_bytes = flow->byte_count;
1170         tcp_flags = flow->tcp_flags;
1171         spin_unlock_bh(&flow->lock);
1172
1173         if (used &&
1174             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1175                 goto nla_put_failure;
1176
1177         if (stats.n_packets &&
1178             nla_put(skb, OVS_FLOW_ATTR_STATS,
1179                     sizeof(struct ovs_flow_stats), &stats))
1180                 goto nla_put_failure;
1181
1182         if (tcp_flags &&
1183             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1184                 goto nla_put_failure;
1185
1186         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1187          * this is the first flow to be dumped into 'skb'.  This is unusual for
1188          * Netlink but individual action lists can be longer than
1189          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1190          * The userspace caller can always fetch the actions separately if it
1191          * really wants them.  (Most userspace callers in fact don't care.)
1192          *
1193          * This can only fail for dump operations because the skb is always
1194          * properly sized for single flows.
1195          */
1196         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1197         if (start) {
1198                 const struct sw_flow_actions *sf_acts;
1199
1200                 sf_acts = rcu_dereference_check(flow->sf_acts,
1201                                                 lockdep_ovsl_is_held());
1202
1203                 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1204                 if (!err)
1205                         nla_nest_end(skb, start);
1206                 else {
1207                         if (skb_orig_len)
1208                                 goto error;
1209
1210                         nla_nest_cancel(skb, start);
1211                 }
1212         } else if (skb_orig_len)
1213                 goto nla_put_failure;
1214
1215         return genlmsg_end(skb, ovs_header);
1216
1217 nla_put_failure:
1218         err = -EMSGSIZE;
1219 error:
1220         genlmsg_cancel(skb, ovs_header);
1221         return err;
1222 }
1223
1224 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1225 {
1226         const struct sw_flow_actions *sf_acts;
1227
1228         sf_acts = ovsl_dereference(flow->sf_acts);
1229
1230         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1231 }
1232
1233 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1234                                                struct datapath *dp,
1235                                                u32 portid, u32 seq, u8 cmd)
1236 {
1237         struct sk_buff *skb;
1238         int retval;
1239
1240         skb = ovs_flow_cmd_alloc_info(flow);
1241         if (!skb)
1242                 return ERR_PTR(-ENOMEM);
1243
1244         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1245         BUG_ON(retval < 0);
1246         return skb;
1247 }
1248
1249 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1250 {
1251         struct nlattr **a = info->attrs;
1252         struct ovs_header *ovs_header = info->userhdr;
1253         struct sw_flow_key key, masked_key;
1254         struct sw_flow *flow = NULL;
1255         struct sw_flow_mask mask;
1256         struct sk_buff *reply;
1257         struct datapath *dp;
1258         struct flow_table *table;
1259         struct sw_flow_actions *acts = NULL;
1260         struct sw_flow_match match;
1261         int error;
1262
1263         /* Extract key. */
1264         error = -EINVAL;
1265         if (!a[OVS_FLOW_ATTR_KEY])
1266                 goto error;
1267
1268         ovs_match_init(&match, &key, &mask);
1269         error = ovs_match_from_nlattrs(&match,
1270                         a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
1271         if (error)
1272                 goto error;
1273
1274         /* Validate actions. */
1275         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1276                 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1277                 error = PTR_ERR(acts);
1278                 if (IS_ERR(acts))
1279                         goto error;
1280
1281                 ovs_flow_key_mask(&masked_key, &key, &mask);
1282                 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1283                                                   &masked_key, 0, &acts);
1284                 if (error) {
1285                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1286                         goto err_kfree;
1287                 }
1288         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1289                 error = -EINVAL;
1290                 goto error;
1291         }
1292
1293         ovs_lock();
1294         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1295         error = -ENODEV;
1296         if (!dp)
1297                 goto err_unlock_ovs;
1298
1299         table = ovsl_dereference(dp->table);
1300
1301         /* Check if this is a duplicate flow */
1302         flow = ovs_flow_lookup(table, &key);
1303         if (!flow) {
1304                 struct sw_flow_mask *mask_p;
1305                 /* Bail out if we're not allowed to create a new flow. */
1306                 error = -ENOENT;
1307                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1308                         goto err_unlock_ovs;
1309
1310                 /* Expand table, if necessary, to make room. */
1311                 if (ovs_flow_tbl_need_to_expand(table)) {
1312                         struct flow_table *new_table;
1313
1314                         new_table = ovs_flow_tbl_expand(table);
1315                         if (!IS_ERR(new_table)) {
1316                                 rcu_assign_pointer(dp->table, new_table);
1317                                 ovs_flow_tbl_destroy(table, true);
1318                                 table = ovsl_dereference(dp->table);
1319                         }
1320                 }
1321
1322                 /* Allocate flow. */
1323                 flow = ovs_flow_alloc();
1324                 if (IS_ERR(flow)) {
1325                         error = PTR_ERR(flow);
1326                         goto err_unlock_ovs;
1327                 }
1328                 clear_stats(flow);
1329
1330                 flow->key = masked_key;
1331                 flow->unmasked_key = key;
1332
1333                 /* Make sure mask is unique in the system */
1334                 mask_p = ovs_sw_flow_mask_find(table, &mask);
1335                 if (!mask_p) {
1336                         /* Allocate a new mask if none exsits. */
1337                         mask_p = ovs_sw_flow_mask_alloc();
1338                         if (!mask_p)
1339                                 goto err_flow_free;
1340                         mask_p->key = mask.key;
1341                         mask_p->range = mask.range;
1342                         ovs_sw_flow_mask_insert(table, mask_p);
1343                 }
1344
1345                 ovs_sw_flow_mask_add_ref(mask_p);
1346                 flow->mask = mask_p;
1347                 rcu_assign_pointer(flow->sf_acts, acts);
1348
1349                 /* Put flow in bucket. */
1350                 ovs_flow_insert(table, flow);
1351
1352                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1353                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
1354         } else {
1355                 /* We found a matching flow. */
1356                 struct sw_flow_actions *old_acts;
1357
1358                 /* Bail out if we're not allowed to modify an existing flow.
1359                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1360                  * because Generic Netlink treats the latter as a dump
1361                  * request.  We also accept NLM_F_EXCL in case that bug ever
1362                  * gets fixed.
1363                  */
1364                 error = -EEXIST;
1365                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1366                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1367                         goto err_unlock_ovs;
1368
1369                 /* The unmasked key has to be the same for flow updates. */
1370                 error = -EINVAL;
1371                 if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) {
1372                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
1373                         goto err_unlock_ovs;
1374                 }
1375
1376                 /* Update actions. */
1377                 old_acts = ovsl_dereference(flow->sf_acts);
1378                 rcu_assign_pointer(flow->sf_acts, acts);
1379                 ovs_flow_deferred_free_acts(old_acts);
1380
1381                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1382                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1383
1384                 /* Clear stats. */
1385                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1386                         spin_lock_bh(&flow->lock);
1387                         clear_stats(flow);
1388                         spin_unlock_bh(&flow->lock);
1389                 }
1390         }
1391         ovs_unlock();
1392
1393         if (!IS_ERR(reply))
1394                 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1395         else
1396                 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1397                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1398         return 0;
1399
1400 err_flow_free:
1401         ovs_flow_free(flow, false);
1402 err_unlock_ovs:
1403         ovs_unlock();
1404 err_kfree:
1405         kfree(acts);
1406 error:
1407         return error;
1408 }
1409
1410 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1411 {
1412         struct nlattr **a = info->attrs;
1413         struct ovs_header *ovs_header = info->userhdr;
1414         struct sw_flow_key key;
1415         struct sk_buff *reply;
1416         struct sw_flow *flow;
1417         struct datapath *dp;
1418         struct flow_table *table;
1419         struct sw_flow_match match;
1420         int err;
1421
1422         if (!a[OVS_FLOW_ATTR_KEY]) {
1423                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1424                 return -EINVAL;
1425         }
1426
1427         ovs_match_init(&match, &key, NULL);
1428         err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1429         if (err)
1430                 return err;
1431
1432         ovs_lock();
1433         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1434         if (!dp) {
1435                 err = -ENODEV;
1436                 goto unlock;
1437         }
1438
1439         table = ovsl_dereference(dp->table);
1440         flow = ovs_flow_lookup_unmasked_key(table, &match);
1441         if (!flow) {
1442                 err = -ENOENT;
1443                 goto unlock;
1444         }
1445
1446         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1447                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1448         if (IS_ERR(reply)) {
1449                 err = PTR_ERR(reply);
1450                 goto unlock;
1451         }
1452
1453         ovs_unlock();
1454         return genlmsg_reply(reply, info);
1455 unlock:
1456         ovs_unlock();
1457         return err;
1458 }
1459
1460 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1461 {
1462         struct nlattr **a = info->attrs;
1463         struct ovs_header *ovs_header = info->userhdr;
1464         struct sw_flow_key key;
1465         struct sk_buff *reply;
1466         struct sw_flow *flow;
1467         struct datapath *dp;
1468         struct flow_table *table;
1469         struct sw_flow_match match;
1470         int err;
1471
1472         ovs_lock();
1473         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1474         if (!dp) {
1475                 err = -ENODEV;
1476                 goto unlock;
1477         }
1478
1479         if (!a[OVS_FLOW_ATTR_KEY]) {
1480                 err = flush_flows(dp);
1481                 goto unlock;
1482         }
1483
1484         ovs_match_init(&match, &key, NULL);
1485         err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1486         if (err)
1487                 goto unlock;
1488
1489         table = ovsl_dereference(dp->table);
1490         flow = ovs_flow_lookup_unmasked_key(table, &match);
1491         if (!flow) {
1492                 err = -ENOENT;
1493                 goto unlock;
1494         }
1495
1496         reply = ovs_flow_cmd_alloc_info(flow);
1497         if (!reply) {
1498                 err = -ENOMEM;
1499                 goto unlock;
1500         }
1501
1502         ovs_flow_remove(table, flow);
1503
1504         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1505                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1506         BUG_ON(err < 0);
1507
1508         ovs_flow_free(flow, true);
1509         ovs_unlock();
1510
1511         ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1512         return 0;
1513 unlock:
1514         ovs_unlock();
1515         return err;
1516 }
1517
1518 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1519 {
1520         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1521         struct datapath *dp;
1522         struct flow_table *table;
1523
1524         rcu_read_lock();
1525         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1526         if (!dp) {
1527                 rcu_read_unlock();
1528                 return -ENODEV;
1529         }
1530
1531         table = rcu_dereference(dp->table);
1532         for (;;) {
1533                 struct sw_flow *flow;
1534                 u32 bucket, obj;
1535
1536                 bucket = cb->args[0];
1537                 obj = cb->args[1];
1538                 flow = ovs_flow_dump_next(table, &bucket, &obj);
1539                 if (!flow)
1540                         break;
1541
1542                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1543                                            NETLINK_CB(cb->skb).portid,
1544                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1545                                            OVS_FLOW_CMD_NEW) < 0)
1546                         break;
1547
1548                 cb->args[0] = bucket;
1549                 cb->args[1] = obj;
1550         }
1551         rcu_read_unlock();
1552         return skb->len;
1553 }
1554
1555 static struct genl_ops dp_flow_genl_ops[] = {
1556         { .cmd = OVS_FLOW_CMD_NEW,
1557           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1558           .policy = flow_policy,
1559           .doit = ovs_flow_cmd_new_or_set
1560         },
1561         { .cmd = OVS_FLOW_CMD_DEL,
1562           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1563           .policy = flow_policy,
1564           .doit = ovs_flow_cmd_del
1565         },
1566         { .cmd = OVS_FLOW_CMD_GET,
1567           .flags = 0,               /* OK for unprivileged users. */
1568           .policy = flow_policy,
1569           .doit = ovs_flow_cmd_get,
1570           .dumpit = ovs_flow_cmd_dump
1571         },
1572         { .cmd = OVS_FLOW_CMD_SET,
1573           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1574           .policy = flow_policy,
1575           .doit = ovs_flow_cmd_new_or_set,
1576         },
1577 };
1578
1579 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1580 #ifdef HAVE_NLA_NUL_STRING
1581         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1582 #endif
1583         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1584 };
1585
1586 static struct genl_family dp_datapath_genl_family = {
1587         .id = GENL_ID_GENERATE,
1588         .hdrsize = sizeof(struct ovs_header),
1589         .name = OVS_DATAPATH_FAMILY,
1590         .version = OVS_DATAPATH_VERSION,
1591         .maxattr = OVS_DP_ATTR_MAX,
1592          SET_NETNSOK
1593          SET_PARALLEL_OPS
1594 };
1595
1596 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1597         .name = OVS_DATAPATH_MCGROUP
1598 };
1599
1600 static size_t ovs_dp_cmd_msg_size(void)
1601 {
1602         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1603
1604         msgsize += nla_total_size(IFNAMSIZ);
1605         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1606
1607         return msgsize;
1608 }
1609
1610 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1611                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1612 {
1613         struct ovs_header *ovs_header;
1614         struct ovs_dp_stats dp_stats;
1615         int err;
1616
1617         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1618                                    flags, cmd);
1619         if (!ovs_header)
1620                 goto error;
1621
1622         ovs_header->dp_ifindex = get_dpifindex(dp);
1623
1624         rcu_read_lock();
1625         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1626         rcu_read_unlock();
1627         if (err)
1628                 goto nla_put_failure;
1629
1630         get_dp_stats(dp, &dp_stats);
1631         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1632                 goto nla_put_failure;
1633
1634         return genlmsg_end(skb, ovs_header);
1635
1636 nla_put_failure:
1637         genlmsg_cancel(skb, ovs_header);
1638 error:
1639         return -EMSGSIZE;
1640 }
1641
1642 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1643                                              u32 seq, u8 cmd)
1644 {
1645         struct sk_buff *skb;
1646         int retval;
1647
1648         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1649         if (!skb)
1650                 return ERR_PTR(-ENOMEM);
1651
1652         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1653         if (retval < 0) {
1654                 kfree_skb(skb);
1655                 return ERR_PTR(retval);
1656         }
1657         return skb;
1658 }
1659
1660 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1661 {
1662         return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1663 }
1664
1665 /* Called with ovs_mutex. */
1666 static struct datapath *lookup_datapath(struct net *net,
1667                                         struct ovs_header *ovs_header,
1668                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1669 {
1670         struct datapath *dp;
1671
1672         if (!a[OVS_DP_ATTR_NAME])
1673                 dp = get_dp(net, ovs_header->dp_ifindex);
1674         else {
1675                 struct vport *vport;
1676
1677                 rcu_read_lock();
1678                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1679                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1680                 rcu_read_unlock();
1681         }
1682         return dp ? dp : ERR_PTR(-ENODEV);
1683 }
1684
1685 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1686 {
1687         struct nlattr **a = info->attrs;
1688         struct vport_parms parms;
1689         struct sk_buff *reply;
1690         struct datapath *dp;
1691         struct vport *vport;
1692         struct ovs_net *ovs_net;
1693         int err, i;
1694
1695         err = -EINVAL;
1696         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1697                 goto err;
1698
1699         err = ovs_dp_cmd_validate(a);
1700         if (err)
1701                 goto err;
1702
1703         ovs_lock();
1704
1705         err = -ENOMEM;
1706         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1707         if (dp == NULL)
1708                 goto err_unlock_ovs;
1709
1710         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1711
1712         /* Allocate table. */
1713         err = -ENOMEM;
1714         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1715         if (!dp->table)
1716                 goto err_free_dp;
1717
1718         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1719         if (!dp->stats_percpu) {
1720                 err = -ENOMEM;
1721                 goto err_destroy_table;
1722         }
1723
1724         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1725                             GFP_KERNEL);
1726         if (!dp->ports) {
1727                 err = -ENOMEM;
1728                 goto err_destroy_percpu;
1729         }
1730
1731         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1732                 INIT_HLIST_HEAD(&dp->ports[i]);
1733
1734         /* Set up our datapath device. */
1735         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1736         parms.type = OVS_VPORT_TYPE_INTERNAL;
1737         parms.options = NULL;
1738         parms.dp = dp;
1739         parms.port_no = OVSP_LOCAL;
1740         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1741
1742         vport = new_vport(&parms);
1743         if (IS_ERR(vport)) {
1744                 err = PTR_ERR(vport);
1745                 if (err == -EBUSY)
1746                         err = -EEXIST;
1747
1748                 goto err_destroy_ports_array;
1749         }
1750
1751         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1752                                       info->snd_seq, OVS_DP_CMD_NEW);
1753         err = PTR_ERR(reply);
1754         if (IS_ERR(reply))
1755                 goto err_destroy_local_port;
1756
1757         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1758         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1759
1760         ovs_unlock();
1761
1762         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1763         return 0;
1764
1765 err_destroy_local_port:
1766         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1767 err_destroy_ports_array:
1768         kfree(dp->ports);
1769 err_destroy_percpu:
1770         free_percpu(dp->stats_percpu);
1771 err_destroy_table:
1772         ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false);
1773 err_free_dp:
1774         release_net(ovs_dp_get_net(dp));
1775         kfree(dp);
1776 err_unlock_ovs:
1777         ovs_unlock();
1778 err:
1779         return err;
1780 }
1781
1782 /* Called with ovs_mutex. */
1783 static void __dp_destroy(struct datapath *dp)
1784 {
1785         int i;
1786
1787         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1788                 struct vport *vport;
1789                 struct hlist_node *n;
1790
1791                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1792                         if (vport->port_no != OVSP_LOCAL)
1793                                 ovs_dp_detach_port(vport);
1794         }
1795
1796         list_del_rcu(&dp->list_node);
1797
1798         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1799          * all port in datapath are destroyed first before freeing datapath.
1800          */
1801         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1802
1803         call_rcu(&dp->rcu, destroy_dp_rcu);
1804 }
1805
1806 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1807 {
1808         struct sk_buff *reply;
1809         struct datapath *dp;
1810         int err;
1811
1812         err = ovs_dp_cmd_validate(info->attrs);
1813         if (err)
1814                 return err;
1815
1816         ovs_lock();
1817         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1818         err = PTR_ERR(dp);
1819         if (IS_ERR(dp))
1820                 goto unlock;
1821
1822         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1823                                       info->snd_seq, OVS_DP_CMD_DEL);
1824         err = PTR_ERR(reply);
1825         if (IS_ERR(reply))
1826                 goto unlock;
1827
1828         __dp_destroy(dp);
1829         ovs_unlock();
1830
1831         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1832
1833         return 0;
1834 unlock:
1835         ovs_unlock();
1836         return err;
1837 }
1838
1839 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1840 {
1841         struct sk_buff *reply;
1842         struct datapath *dp;
1843         int err;
1844
1845         err = ovs_dp_cmd_validate(info->attrs);
1846         if (err)
1847                 return err;
1848
1849         ovs_lock();
1850         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1851         err = PTR_ERR(dp);
1852         if (IS_ERR(dp))
1853                 goto unlock;
1854
1855         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1856                                       info->snd_seq, OVS_DP_CMD_NEW);
1857         if (IS_ERR(reply)) {
1858                 err = PTR_ERR(reply);
1859                 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1860                                 ovs_dp_datapath_multicast_group.id, err);
1861                 err = 0;
1862                 goto unlock;
1863         }
1864
1865         ovs_unlock();
1866         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1867
1868         return 0;
1869 unlock:
1870         ovs_unlock();
1871         return err;
1872 }
1873
1874 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1875 {
1876         struct sk_buff *reply;
1877         struct datapath *dp;
1878         int err;
1879
1880         err = ovs_dp_cmd_validate(info->attrs);
1881         if (err)
1882                 return err;
1883
1884         ovs_lock();
1885         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1886         if (IS_ERR(dp)) {
1887                 err = PTR_ERR(dp);
1888                 goto unlock;
1889         }
1890
1891         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1892                                       info->snd_seq, OVS_DP_CMD_NEW);
1893         if (IS_ERR(reply)) {
1894                 err = PTR_ERR(reply);
1895                 goto unlock;
1896         }
1897
1898         ovs_unlock();
1899         return genlmsg_reply(reply, info);
1900
1901 unlock:
1902         ovs_unlock();
1903         return err;
1904 }
1905
1906 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1907 {
1908         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1909         struct datapath *dp;
1910         int skip = cb->args[0];
1911         int i = 0;
1912
1913         rcu_read_lock();
1914         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1915                 if (i >= skip &&
1916                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1917                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1918                                          OVS_DP_CMD_NEW) < 0)
1919                         break;
1920                 i++;
1921         }
1922         rcu_read_unlock();
1923
1924         cb->args[0] = i;
1925
1926         return skb->len;
1927 }
1928
1929 static struct genl_ops dp_datapath_genl_ops[] = {
1930         { .cmd = OVS_DP_CMD_NEW,
1931           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1932           .policy = datapath_policy,
1933           .doit = ovs_dp_cmd_new
1934         },
1935         { .cmd = OVS_DP_CMD_DEL,
1936           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1937           .policy = datapath_policy,
1938           .doit = ovs_dp_cmd_del
1939         },
1940         { .cmd = OVS_DP_CMD_GET,
1941           .flags = 0,               /* OK for unprivileged users. */
1942           .policy = datapath_policy,
1943           .doit = ovs_dp_cmd_get,
1944           .dumpit = ovs_dp_cmd_dump
1945         },
1946         { .cmd = OVS_DP_CMD_SET,
1947           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1948           .policy = datapath_policy,
1949           .doit = ovs_dp_cmd_set,
1950         },
1951 };
1952
1953 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1954 #ifdef HAVE_NLA_NUL_STRING
1955         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1956         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1957 #else
1958         [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1959 #endif
1960         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1961         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1962         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1963         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1964 };
1965
1966 static struct genl_family dp_vport_genl_family = {
1967         .id = GENL_ID_GENERATE,
1968         .hdrsize = sizeof(struct ovs_header),
1969         .name = OVS_VPORT_FAMILY,
1970         .version = OVS_VPORT_VERSION,
1971         .maxattr = OVS_VPORT_ATTR_MAX,
1972          SET_NETNSOK
1973          SET_PARALLEL_OPS
1974 };
1975
1976 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1977         .name = OVS_VPORT_MCGROUP
1978 };
1979
1980 /* Called with ovs_mutex or RCU read lock. */
1981 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1982                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1983 {
1984         struct ovs_header *ovs_header;
1985         struct ovs_vport_stats vport_stats;
1986         int err;
1987
1988         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1989                                  flags, cmd);
1990         if (!ovs_header)
1991                 return -EMSGSIZE;
1992
1993         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1994
1995         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1996             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1997             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1998             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1999                 goto nla_put_failure;
2000
2001         ovs_vport_get_stats(vport, &vport_stats);
2002         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
2003                     &vport_stats))
2004                 goto nla_put_failure;
2005
2006         err = ovs_vport_get_options(vport, skb);
2007         if (err == -EMSGSIZE)
2008                 goto error;
2009
2010         return genlmsg_end(skb, ovs_header);
2011
2012 nla_put_failure:
2013         err = -EMSGSIZE;
2014 error:
2015         genlmsg_cancel(skb, ovs_header);
2016         return err;
2017 }
2018
2019 /* Called with ovs_mutex or RCU read lock. */
2020 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
2021                                          u32 seq, u8 cmd)
2022 {
2023         struct sk_buff *skb;
2024         int retval;
2025
2026         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2027         if (!skb)
2028                 return ERR_PTR(-ENOMEM);
2029
2030         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
2031         BUG_ON(retval < 0);
2032
2033         return skb;
2034 }
2035
2036 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2037 {
2038         return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
2039 }
2040
2041 /* Called with ovs_mutex or RCU read lock. */
2042 static struct vport *lookup_vport(struct net *net,
2043                                   struct ovs_header *ovs_header,
2044                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2045 {
2046         struct datapath *dp;
2047         struct vport *vport;
2048
2049         if (a[OVS_VPORT_ATTR_NAME]) {
2050                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2051                 if (!vport)
2052                         return ERR_PTR(-ENODEV);
2053                 if (ovs_header->dp_ifindex &&
2054                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2055                         return ERR_PTR(-ENODEV);
2056                 return vport;
2057         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2058                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2059
2060                 if (port_no >= DP_MAX_PORTS)
2061                         return ERR_PTR(-EFBIG);
2062
2063                 dp = get_dp(net, ovs_header->dp_ifindex);
2064                 if (!dp)
2065                         return ERR_PTR(-ENODEV);
2066
2067                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2068                 if (!vport)
2069                         return ERR_PTR(-ENODEV);
2070                 return vport;
2071         } else
2072                 return ERR_PTR(-EINVAL);
2073 }
2074
2075 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2076 {
2077         struct nlattr **a = info->attrs;
2078         struct ovs_header *ovs_header = info->userhdr;
2079         struct vport_parms parms;
2080         struct sk_buff *reply;
2081         struct vport *vport;
2082         struct datapath *dp;
2083         u32 port_no;
2084         int err;
2085
2086         err = -EINVAL;
2087         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2088             !a[OVS_VPORT_ATTR_UPCALL_PID])
2089                 goto exit;
2090
2091         err = ovs_vport_cmd_validate(a);
2092         if (err)
2093                 goto exit;
2094
2095         ovs_lock();
2096         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2097         err = -ENODEV;
2098         if (!dp)
2099                 goto exit_unlock;
2100
2101         if (a[OVS_VPORT_ATTR_PORT_NO]) {
2102                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2103
2104                 err = -EFBIG;
2105                 if (port_no >= DP_MAX_PORTS)
2106                         goto exit_unlock;
2107
2108                 vport = ovs_vport_ovsl(dp, port_no);
2109                 err = -EBUSY;
2110                 if (vport)
2111                         goto exit_unlock;
2112         } else {
2113                 for (port_no = 1; ; port_no++) {
2114                         if (port_no >= DP_MAX_PORTS) {
2115                                 err = -EFBIG;
2116                                 goto exit_unlock;
2117                         }
2118                         vport = ovs_vport_ovsl(dp, port_no);
2119                         if (!vport)
2120                                 break;
2121                 }
2122         }
2123
2124         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2125         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2126         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2127         parms.dp = dp;
2128         parms.port_no = port_no;
2129         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2130
2131         vport = new_vport(&parms);
2132         err = PTR_ERR(vport);
2133         if (IS_ERR(vport))
2134                 goto exit_unlock;
2135
2136         err = 0;
2137         if (a[OVS_VPORT_ATTR_STATS])
2138                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2139
2140         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2141                                          OVS_VPORT_CMD_NEW);
2142         if (IS_ERR(reply)) {
2143                 err = PTR_ERR(reply);
2144                 ovs_dp_detach_port(vport);
2145                 goto exit_unlock;
2146         }
2147
2148         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2149
2150 exit_unlock:
2151         ovs_unlock();
2152 exit:
2153         return err;
2154 }
2155
2156 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2157 {
2158         struct nlattr **a = info->attrs;
2159         struct sk_buff *reply;
2160         struct vport *vport;
2161         int err;
2162
2163         err = ovs_vport_cmd_validate(a);
2164         if (err)
2165                 goto exit;
2166
2167         ovs_lock();
2168         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2169         err = PTR_ERR(vport);
2170         if (IS_ERR(vport))
2171                 goto exit_unlock;
2172
2173         if (a[OVS_VPORT_ATTR_TYPE] &&
2174             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2175                 err = -EINVAL;
2176                 goto exit_unlock;
2177         }
2178
2179         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2180         if (!reply) {
2181                 err = -ENOMEM;
2182                 goto exit_unlock;
2183         }
2184
2185         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2186                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2187                 if (err)
2188                         goto exit_free;
2189         }
2190
2191         if (a[OVS_VPORT_ATTR_STATS])
2192                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2193
2194         if (a[OVS_VPORT_ATTR_UPCALL_PID])
2195                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2196
2197         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2198                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2199         BUG_ON(err < 0);
2200
2201         ovs_unlock();
2202         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2203         return 0;
2204
2205 exit_free:
2206         kfree_skb(reply);
2207 exit_unlock:
2208         ovs_unlock();
2209 exit:
2210         return err;
2211 }
2212
2213 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2214 {
2215         struct nlattr **a = info->attrs;
2216         struct sk_buff *reply;
2217         struct vport *vport;
2218         int err;
2219
2220         err = ovs_vport_cmd_validate(a);
2221         if (err)
2222                 goto exit;
2223
2224         ovs_lock();
2225         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2226         err = PTR_ERR(vport);
2227         if (IS_ERR(vport))
2228                 goto exit_unlock;
2229
2230         if (vport->port_no == OVSP_LOCAL) {
2231                 err = -EINVAL;
2232                 goto exit_unlock;
2233         }
2234
2235         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2236                                          info->snd_seq, OVS_VPORT_CMD_DEL);
2237         err = PTR_ERR(reply);
2238         if (IS_ERR(reply))
2239                 goto exit_unlock;
2240
2241         err = 0;
2242         ovs_dp_detach_port(vport);
2243
2244         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2245
2246 exit_unlock:
2247         ovs_unlock();
2248 exit:
2249         return err;
2250 }
2251
2252 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2253 {
2254         struct nlattr **a = info->attrs;
2255         struct ovs_header *ovs_header = info->userhdr;
2256         struct sk_buff *reply;
2257         struct vport *vport;
2258         int err;
2259
2260         err = ovs_vport_cmd_validate(a);
2261         if (err)
2262                 goto exit;
2263
2264         rcu_read_lock();
2265         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2266         err = PTR_ERR(vport);
2267         if (IS_ERR(vport))
2268                 goto exit_unlock;
2269
2270         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2271                                          info->snd_seq, OVS_VPORT_CMD_NEW);
2272         err = PTR_ERR(reply);
2273         if (IS_ERR(reply))
2274                 goto exit_unlock;
2275
2276         rcu_read_unlock();
2277
2278         return genlmsg_reply(reply, info);
2279
2280 exit_unlock:
2281         rcu_read_unlock();
2282 exit:
2283         return err;
2284 }
2285
2286 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2287 {
2288         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2289         struct datapath *dp;
2290         int bucket = cb->args[0], skip = cb->args[1];
2291         int i, j = 0;
2292
2293         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2294         if (!dp)
2295                 return -ENODEV;
2296
2297         rcu_read_lock();
2298         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2299                 struct vport *vport;
2300
2301                 j = 0;
2302                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2303                         if (j >= skip &&
2304                             ovs_vport_cmd_fill_info(vport, skb,
2305                                                     NETLINK_CB(cb->skb).portid,
2306                                                     cb->nlh->nlmsg_seq,
2307                                                     NLM_F_MULTI,
2308                                                     OVS_VPORT_CMD_NEW) < 0)
2309                                 goto out;
2310
2311                         j++;
2312                 }
2313                 skip = 0;
2314         }
2315 out:
2316         rcu_read_unlock();
2317
2318         cb->args[0] = i;
2319         cb->args[1] = j;
2320
2321         return skb->len;
2322 }
2323
2324 static struct genl_ops dp_vport_genl_ops[] = {
2325         { .cmd = OVS_VPORT_CMD_NEW,
2326           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2327           .policy = vport_policy,
2328           .doit = ovs_vport_cmd_new
2329         },
2330         { .cmd = OVS_VPORT_CMD_DEL,
2331           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2332           .policy = vport_policy,
2333           .doit = ovs_vport_cmd_del
2334         },
2335         { .cmd = OVS_VPORT_CMD_GET,
2336           .flags = 0,               /* OK for unprivileged users. */
2337           .policy = vport_policy,
2338           .doit = ovs_vport_cmd_get,
2339           .dumpit = ovs_vport_cmd_dump
2340         },
2341         { .cmd = OVS_VPORT_CMD_SET,
2342           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2343           .policy = vport_policy,
2344           .doit = ovs_vport_cmd_set,
2345         },
2346 };
2347
2348 struct genl_family_and_ops {
2349         struct genl_family *family;
2350         struct genl_ops *ops;
2351         int n_ops;
2352         struct genl_multicast_group *group;
2353 };
2354
2355 static const struct genl_family_and_ops dp_genl_families[] = {
2356         { &dp_datapath_genl_family,
2357           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2358           &ovs_dp_datapath_multicast_group },
2359         { &dp_vport_genl_family,
2360           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2361           &ovs_dp_vport_multicast_group },
2362         { &dp_flow_genl_family,
2363           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2364           &ovs_dp_flow_multicast_group },
2365         { &dp_packet_genl_family,
2366           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2367           NULL },
2368 };
2369
2370 static void dp_unregister_genl(int n_families)
2371 {
2372         int i;
2373
2374         for (i = 0; i < n_families; i++)
2375                 genl_unregister_family(dp_genl_families[i].family);
2376 }
2377
2378 static int dp_register_genl(void)
2379 {
2380         int n_registered;
2381         int err;
2382         int i;
2383
2384         n_registered = 0;
2385         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2386                 const struct genl_family_and_ops *f = &dp_genl_families[i];
2387
2388                 err = genl_register_family_with_ops(f->family, f->ops,
2389                                                     f->n_ops);
2390                 if (err)
2391                         goto error;
2392                 n_registered++;
2393
2394                 if (f->group) {
2395                         err = genl_register_mc_group(f->family, f->group);
2396                         if (err)
2397                                 goto error;
2398                 }
2399         }
2400
2401         return 0;
2402
2403 error:
2404         dp_unregister_genl(n_registered);
2405         return err;
2406 }
2407
2408 static void rehash_flow_table(struct work_struct *work)
2409 {
2410         struct datapath *dp;
2411         struct net *net;
2412
2413         ovs_lock();
2414         rtnl_lock();
2415         for_each_net(net) {
2416                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2417
2418                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2419                         struct flow_table *old_table = ovsl_dereference(dp->table);
2420                         struct flow_table *new_table;
2421
2422                         new_table = ovs_flow_tbl_rehash(old_table);
2423                         if (!IS_ERR(new_table)) {
2424                                 rcu_assign_pointer(dp->table, new_table);
2425                                 ovs_flow_tbl_destroy(old_table, true);
2426                         }
2427                 }
2428         }
2429         rtnl_unlock();
2430         ovs_unlock();
2431         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2432 }
2433
2434 static int __net_init ovs_init_net(struct net *net)
2435 {
2436         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2437
2438         INIT_LIST_HEAD(&ovs_net->dps);
2439         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2440         return 0;
2441 }
2442
2443 static void __net_exit ovs_exit_net(struct net *net)
2444 {
2445         struct datapath *dp, *dp_next;
2446         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2447
2448         ovs_lock();
2449         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2450                 __dp_destroy(dp);
2451         ovs_unlock();
2452
2453         cancel_work_sync(&ovs_net->dp_notify_work);
2454 }
2455
2456 static struct pernet_operations ovs_net_ops = {
2457         .init = ovs_init_net,
2458         .exit = ovs_exit_net,
2459         .id   = &ovs_net_id,
2460         .size = sizeof(struct ovs_net),
2461 };
2462
2463 DEFINE_COMPAT_PNET_REG_FUNC(device);
2464
2465 static int __init dp_init(void)
2466 {
2467         int err;
2468
2469         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2470
2471         pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2472                 VERSION);
2473
2474         err = ovs_workqueues_init();
2475         if (err)
2476                 goto error;
2477
2478         err = ovs_flow_init();
2479         if (err)
2480                 goto error_wq;
2481
2482         err = ovs_vport_init();
2483         if (err)
2484                 goto error_flow_exit;
2485
2486         err = register_pernet_device(&ovs_net_ops);
2487         if (err)
2488                 goto error_vport_exit;
2489
2490         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2491         if (err)
2492                 goto error_netns_exit;
2493
2494         err = dp_register_genl();
2495         if (err < 0)
2496                 goto error_unreg_notifier;
2497
2498         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2499
2500         return 0;
2501
2502 error_unreg_notifier:
2503         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2504 error_netns_exit:
2505         unregister_pernet_device(&ovs_net_ops);
2506 error_vport_exit:
2507         ovs_vport_exit();
2508 error_flow_exit:
2509         ovs_flow_exit();
2510 error_wq:
2511         ovs_workqueues_exit();
2512 error:
2513         return err;
2514 }
2515
2516 static void dp_cleanup(void)
2517 {
2518         cancel_delayed_work_sync(&rehash_flow_wq);
2519         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2520         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2521         unregister_pernet_device(&ovs_net_ops);
2522         rcu_barrier();
2523         ovs_vport_exit();
2524         ovs_flow_exit();
2525         ovs_workqueues_exit();
2526 }
2527
2528 module_init(dp_init);
2529 module_exit(dp_cleanup);
2530
2531 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2532 MODULE_LICENSE("GPL");
2533 MODULE_VERSION(VERSION);