datapath/datapath.c

   1 /*
   2  * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
   3  * Distributed under the terms of the GNU GPL version 2.
   4  *
   5  * Significant portions of this file may be copied from parts of the Linux
   6  * kernel, by Linus Torvalds and others.
   7  */
   8
   9 /* Functions for managing the dp interface/device. */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/in.h>
  18 #include <linux/ip.h>
  19 #include <linux/jhash.h>
  20 #include <linux/delay.h>
  21 #include <linux/time.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/genetlink.h>
  24 #include <linux/kernel.h>
  25 #include <linux/kthread.h>
  26 #include <linux/mutex.h>
  27 #include <linux/percpu.h>
  28 #include <linux/rcupdate.h>
  29 #include <linux/tcp.h>
  30 #include <linux/udp.h>
  31 #include <linux/version.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/wait.h>
  34 #include <asm/system.h>
  35 #include <asm/div64.h>
  36 #include <asm/bug.h>
  37 #include <linux/highmem.h>
  38 #include <linux/netfilter_bridge.h>
  39 #include <linux/netfilter_ipv4.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/list.h>
  42 #include <linux/rculist.h>
  43 #include <linux/dmi.h>
  44 #include <net/inet_ecn.h>
  45 #include <net/genetlink.h>
  46
  47 #include "openvswitch/datapath-protocol.h"
  48 #include "checksum.h"
  49 #include "datapath.h"
  50 #include "actions.h"
  51 #include "flow.h"
  52 #include "loop_counter.h"
  53 #include "table.h"
  54 #include "vlan.h"
  55 #include "vport-internal_dev.h"
  56
  57 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
  58 EXPORT_SYMBOL(dp_ioctl_hook);
  59
  60 /**
  61  * DOC: Locking:
  62  *
  63  * Writes to device state (add/remove datapath, port, set operations on vports,
  64  * etc.) are protected by RTNL.
  65  *
  66  * Writes to other state (flow table modifications, set miscellaneous datapath
  67  * parameters such as drop frags, etc.) are protected by genl_mutex.  The RTNL
  68  * lock nests inside genl_mutex.
  69  *
  70  * Reads are protected by RCU.
  71  *
  72  * There are a few special cases (mostly stats) that have their own
  73  * synchronization but they nest under all of above and don't interact with
  74  * each other.
  75  */
  76
  77 /* Global list of datapaths to enable dumping them all out.
  78  * Protected by genl_mutex.
  79  */
  80 static LIST_HEAD(dps);
  81
  82 static struct vport *new_vport(const struct vport_parms *);
  83 static int queue_control_packets(struct datapath *, struct sk_buff *,
  84                                  const struct dp_upcall_info *);
  85
  86 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
  87 struct datapath *get_dp(int dp_ifindex)
  88 {
  89         struct datapath *dp = NULL;
  90         struct net_device *dev;
  91
  92         rcu_read_lock();
  93         dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
  94         if (dev) {
  95                 struct vport *vport = internal_dev_get_vport(dev);
  96                 if (vport)
  97                         dp = vport->dp;
  98         }
  99         rcu_read_unlock();
 100
 101         return dp;
 102 }
 103 EXPORT_SYMBOL_GPL(get_dp);
 104
 105 /* Must be called with genl_mutex. */
 106 static struct tbl *get_table_protected(struct datapath *dp)
 107 {
 108         return rcu_dereference_protected(dp->table, lockdep_genl_is_held());
 109 }
 110
 111 /* Must be called with rcu_read_lock or RTNL lock. */
 112 static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
 113 {
 114         return rcu_dereference_rtnl(dp->ports[port_no]);
 115 }
 116
 117 /* Must be called with rcu_read_lock or RTNL lock. */
 118 const char *dp_name(const struct datapath *dp)
 119 {
 120         return vport_get_name(rcu_dereference_rtnl(dp->ports[ODPP_LOCAL]));
 121 }
 122
 123 static inline size_t br_nlmsg_size(void)
 124 {
 125         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 126                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 127                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 128                + nla_total_size(4) /* IFLA_MASTER */
 129                + nla_total_size(4) /* IFLA_MTU */
 130                + nla_total_size(4) /* IFLA_LINK */
 131                + nla_total_size(1); /* IFLA_OPERSTATE */
 132 }
 133
 134 /* Caller must hold RTNL lock. */
 135 static int dp_fill_ifinfo(struct sk_buff *skb,
 136                           const struct vport *port,
 137                           int event, unsigned int flags)
 138 {
 139         struct datapath *dp = port->dp;
 140         int ifindex = vport_get_ifindex(port);
 141         int iflink = vport_get_iflink(port);
 142         struct ifinfomsg *hdr;
 143         struct nlmsghdr *nlh;
 144
 145         if (ifindex < 0)
 146                 return ifindex;
 147
 148         if (iflink < 0)
 149                 return iflink;
 150
 151         nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
 152         if (nlh == NULL)
 153                 return -EMSGSIZE;
 154
 155         hdr = nlmsg_data(nlh);
 156         hdr->ifi_family = AF_BRIDGE;
 157         hdr->__ifi_pad = 0;
 158         hdr->ifi_type = ARPHRD_ETHER;
 159         hdr->ifi_index = ifindex;
 160         hdr->ifi_flags = vport_get_flags(port);
 161         hdr->ifi_change = 0;
 162
 163         NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
 164         NLA_PUT_U32(skb, IFLA_MASTER,
 165                 vport_get_ifindex(get_vport_protected(dp, ODPP_LOCAL)));
 166         NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
 167 #ifdef IFLA_OPERSTATE
 168         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 169                    vport_is_running(port)
 170                         ? vport_get_operstate(port)
 171                         : IF_OPER_DOWN);
 172 #endif
 173
 174         NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
 175
 176         if (ifindex != iflink)
 177                 NLA_PUT_U32(skb, IFLA_LINK,iflink);
 178
 179         return nlmsg_end(skb, nlh);
 180
 181 nla_put_failure:
 182         nlmsg_cancel(skb, nlh);
 183         return -EMSGSIZE;
 184 }
 185
 186 /* Caller must hold RTNL lock. */
 187 static void dp_ifinfo_notify(int event, struct vport *port)
 188 {
 189         struct sk_buff *skb;
 190         int err = -ENOBUFS;
 191
 192         skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
 193         if (skb == NULL)
 194                 goto errout;
 195
 196         err = dp_fill_ifinfo(skb, port, event, 0);
 197         if (err < 0) {
 198                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 199                 WARN_ON(err == -EMSGSIZE);
 200                 kfree_skb(skb);
 201                 goto errout;
 202         }
 203         rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
 204         return;
 205 errout:
 206         if (err < 0)
 207                 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
 208 }
 209
 210 static void release_dp(struct kobject *kobj)
 211 {
 212         struct datapath *dp = container_of(kobj, struct datapath, ifobj);
 213         kfree(dp);
 214 }
 215
 216 static struct kobj_type dp_ktype = {
 217         .release = release_dp
 218 };
 219
 220 static void destroy_dp_rcu(struct rcu_head *rcu)
 221 {
 222         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 223
 224         tbl_destroy((struct tbl __force *)dp->table, flow_free_tbl);
 225         free_percpu(dp->stats_percpu);
 226         kobject_put(&dp->ifobj);
 227 }
 228
 229 /* Called with RTNL lock and genl_lock. */
 230 static struct vport *new_vport(const struct vport_parms *parms)
 231 {
 232         struct vport *vport;
 233
 234         vport = vport_add(parms);
 235         if (!IS_ERR(vport)) {
 236                 struct datapath *dp = parms->dp;
 237
 238                 rcu_assign_pointer(dp->ports[parms->port_no], vport);
 239                 list_add(&vport->node, &dp->port_list);
 240
 241                 dp_ifinfo_notify(RTM_NEWLINK, vport);
 242         }
 243
 244         return vport;
 245 }
 246
 247 /* Called with RTNL lock. */
 248 int dp_detach_port(struct vport *p)
 249 {
 250         ASSERT_RTNL();
 251
 252         if (p->port_no != ODPP_LOCAL)
 253                 dp_sysfs_del_if(p);
 254         dp_ifinfo_notify(RTM_DELLINK, p);
 255
 256         /* First drop references to device. */
 257         list_del(&p->node);
 258         rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
 259
 260         /* Then destroy it. */
 261         return vport_del(p);
 262 }
 263
 264 /* Must be called with rcu_read_lock. */
 265 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 266 {
 267         struct datapath *dp = p->dp;
 268         struct dp_stats_percpu *stats;
 269         int stats_counter_off;
 270         struct sw_flow_actions *acts;
 271         struct loop_counter *loop;
 272         int error;
 273
 274         OVS_CB(skb)->vport = p;
 275
 276         if (!OVS_CB(skb)->flow) {
 277                 struct sw_flow_key key;
 278                 struct tbl_node *flow_node;
 279                 bool is_frag;
 280
 281                 /* Extract flow from 'skb' into 'key'. */
 282                 error = flow_extract(skb, p->port_no, &key, &is_frag);
 283                 if (unlikely(error)) {
 284                         kfree_skb(skb);
 285                         return;
 286                 }
 287
 288                 if (is_frag && dp->drop_frags) {
 289                         kfree_skb(skb);
 290                         stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
 291                         goto out;
 292                 }
 293
 294                 /* Look up flow. */
 295                 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
 296                                         flow_hash(&key), flow_cmp);
 297                 if (unlikely(!flow_node)) {
 298                         struct dp_upcall_info upcall;
 299
 300                         upcall.cmd = ODP_PACKET_CMD_MISS;
 301                         upcall.key = &key;
 302                         upcall.userdata = 0;
 303                         upcall.sample_pool = 0;
 304                         upcall.actions = NULL;
 305                         upcall.actions_len = 0;
 306                         dp_upcall(dp, skb, &upcall);
 307                         stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
 308                         goto out;
 309                 }
 310
 311                 OVS_CB(skb)->flow = flow_cast(flow_node);
 312         }
 313
 314         stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
 315         flow_used(OVS_CB(skb)->flow, skb);
 316
 317         acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
 318
 319         /* Check whether we've looped too much. */
 320         loop = loop_get_counter();
 321         if (unlikely(++loop->count > MAX_LOOPS))
 322                 loop->looping = true;
 323         if (unlikely(loop->looping)) {
 324                 loop_suppress(dp, acts);
 325                 kfree_skb(skb);
 326                 goto out_loop;
 327         }
 328
 329         /* Execute actions. */
 330         execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
 331                         acts->actions_len);
 332
 333         /* Check whether sub-actions looped too much. */
 334         if (unlikely(loop->looping))
 335                 loop_suppress(dp, acts);
 336
 337 out_loop:
 338         /* Decrement loop counter. */
 339         if (!--loop->count)
 340                 loop->looping = false;
 341         loop_put_counter();
 342
 343 out:
 344         /* Update datapath statistics. */
 345         local_bh_disable();
 346         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 347
 348         write_seqcount_begin(&stats->seqlock);
 349         (*(u64 *)((u8 *)stats + stats_counter_off))++;
 350         write_seqcount_end(&stats->seqlock);
 351
 352         local_bh_enable();
 353 }
 354
 355 static void copy_and_csum_skb(struct sk_buff *skb, void *to)
 356 {
 357         u16 csum_start, csum_offset;
 358         __wsum csum;
 359
 360         get_skb_csum_pointers(skb, &csum_start, &csum_offset);
 361         csum_start -= skb_headroom(skb);
 362
 363         skb_copy_bits(skb, 0, to, csum_start);
 364
 365         csum = skb_copy_and_csum_bits(skb, csum_start, to + csum_start,
 366                                       skb->len - csum_start, 0);
 367         *(__sum16 *)(to + csum_start + csum_offset) = csum_fold(csum);
 368 }
 369
 370 static struct genl_family dp_packet_genl_family = {
 371         .id = GENL_ID_GENERATE,
 372         .hdrsize = sizeof(struct odp_header),
 373         .name = ODP_PACKET_FAMILY,
 374         .version = 1,
 375         .maxattr = ODP_PACKET_ATTR_MAX
 376 };
 377
 378 /* Generic Netlink multicast groups for upcalls.
 379  *
 380  * We really want three unique multicast groups per datapath, but we can't even
 381  * get one, because genl_register_mc_group() takes genl_lock, which is also
 382  * held during Generic Netlink message processing, so trying to acquire
 383  * multicast groups during ODP_DP_NEW processing deadlocks.  Instead, we
 384  * preallocate a few groups and use them round-robin for datapaths.  Collision
 385  * isn't fatal--multicast listeners should check that the family is the one
 386  * that they want and discard others--but it wastes time and memory to receive
 387  * unwanted messages.
 388  */
 389 #define PACKET_N_MC_GROUPS 16
 390 static struct genl_multicast_group packet_mc_groups[PACKET_N_MC_GROUPS];
 391
 392 static u32 packet_mc_group(struct datapath *dp, u8 cmd)
 393 {
 394         u32 idx;
 395         BUILD_BUG_ON_NOT_POWER_OF_2(PACKET_N_MC_GROUPS);
 396
 397         idx = jhash_2words(dp->dp_ifindex, cmd, 0) & (PACKET_N_MC_GROUPS - 1);
 398         return packet_mc_groups[idx].id;
 399 }
 400
 401 static int packet_register_mc_groups(void)
 402 {
 403         int i;
 404
 405         for (i = 0; i < PACKET_N_MC_GROUPS; i++) {
 406                 struct genl_multicast_group *group = &packet_mc_groups[i];
 407                 int error;
 408
 409                 sprintf(group->name, "packet%d", i);
 410                 error = genl_register_mc_group(&dp_packet_genl_family, group);
 411                 if (error)
 412                         return error;
 413         }
 414         return 0;
 415 }
 416
 417 int dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_info *upcall_info)
 418 {
 419         struct dp_stats_percpu *stats;
 420         int err;
 421
 422         WARN_ON_ONCE(skb_shared(skb));
 423
 424         forward_ip_summed(skb);
 425
 426         err = vswitch_skb_checksum_setup(skb);
 427         if (err)
 428                 goto err_kfree_skb;
 429
 430         /* Break apart GSO packets into their component pieces.  Otherwise
 431          * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
 432         if (skb_is_gso(skb)) {
 433                 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
 434
 435                 kfree_skb(skb);
 436                 skb = nskb;
 437                 if (IS_ERR(skb)) {
 438                         err = PTR_ERR(skb);
 439                         goto err;
 440                 }
 441         }
 442
 443         err = queue_control_packets(dp, skb, upcall_info);
 444         if (err)
 445                 goto err;
 446
 447         return 0;
 448
 449 err_kfree_skb:
 450         kfree_skb(skb);
 451 err:
 452         local_bh_disable();
 453         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 454
 455         write_seqcount_begin(&stats->seqlock);
 456         stats->n_lost++;
 457         write_seqcount_end(&stats->seqlock);
 458
 459         local_bh_enable();
 460
 461         return err;
 462 }
 463
 464 /* Send each packet in the 'skb' list to userspace for 'dp' as directed by
 465  * 'upcall_info'.  There will be only one packet unless we broke up a GSO
 466  * packet.
 467  */
 468 static int queue_control_packets(struct datapath *dp, struct sk_buff *skb,
 469                                  const struct dp_upcall_info *upcall_info)
 470 {
 471         u32 group = packet_mc_group(dp, upcall_info->cmd);
 472         struct sk_buff *nskb;
 473         int port_no;
 474         int err;
 475
 476         if (OVS_CB(skb)->vport)
 477                 port_no = OVS_CB(skb)->vport->port_no;
 478         else
 479                 port_no = ODPP_LOCAL;
 480
 481         do {
 482                 struct odp_header *upcall;
 483                 struct sk_buff *user_skb; /* to be queued to userspace */
 484                 struct nlattr *nla;
 485                 unsigned int len;
 486
 487                 nskb = skb->next;
 488                 skb->next = NULL;
 489
 490                 err = vlan_deaccel_tag(skb);
 491                 if (unlikely(err))
 492                         goto err_kfree_skbs;
 493
 494                 if (nla_attr_size(skb->len) > USHRT_MAX)
 495                         goto err_kfree_skbs;
 496
 497                 len = sizeof(struct odp_header);
 498                 len += nla_total_size(skb->len);
 499                 len += nla_total_size(FLOW_BUFSIZE);
 500                 if (upcall_info->userdata)
 501                         len += nla_total_size(8);
 502                 if (upcall_info->sample_pool)
 503                         len += nla_total_size(4);
 504                 if (upcall_info->actions_len)
 505                         len += nla_total_size(upcall_info->actions_len);
 506
 507                 user_skb = genlmsg_new(len, GFP_ATOMIC);
 508                 if (!user_skb) {
 509                         netlink_set_err(INIT_NET_GENL_SOCK, 0, group, -ENOBUFS);
 510                         goto err_kfree_skbs;
 511                 }
 512
 513                 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 0, upcall_info->cmd);
 514                 upcall->dp_ifindex = dp->dp_ifindex;
 515
 516                 nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_KEY);
 517                 flow_to_nlattrs(upcall_info->key, user_skb);
 518                 nla_nest_end(user_skb, nla);
 519
 520                 if (upcall_info->userdata)
 521                         nla_put_u64(user_skb, ODP_PACKET_ATTR_USERDATA, upcall_info->userdata);
 522                 if (upcall_info->sample_pool)
 523                         nla_put_u32(user_skb, ODP_PACKET_ATTR_SAMPLE_POOL, upcall_info->sample_pool);
 524                 if (upcall_info->actions_len) {
 525                         const struct nlattr *actions = upcall_info->actions;
 526                         u32 actions_len = upcall_info->actions_len;
 527
 528                         nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_ACTIONS);
 529                         memcpy(__skb_put(user_skb, actions_len), actions, actions_len);
 530                         nla_nest_end(user_skb, nla);
 531                 }
 532
 533                 nla = __nla_reserve(user_skb, ODP_PACKET_ATTR_PACKET, skb->len);
 534                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 535                         copy_and_csum_skb(skb, nla_data(nla));
 536                 else
 537                         skb_copy_bits(skb, 0, nla_data(nla), skb->len);
 538
 539                 err = genlmsg_multicast(user_skb, 0, group, GFP_ATOMIC);
 540                 if (err)
 541                         goto err_kfree_skbs;
 542
 543                 kfree_skb(skb);
 544                 skb = nskb;
 545         } while (skb);
 546         return 0;
 547
 548 err_kfree_skbs:
 549         kfree_skb(skb);
 550         while ((skb = nskb) != NULL) {
 551                 nskb = skb->next;
 552                 kfree_skb(skb);
 553         }
 554         return err;
 555 }
 556
 557 /* Called with genl_mutex. */
 558 static int flush_flows(int dp_ifindex)
 559 {
 560         struct tbl *old_table;
 561         struct tbl *new_table;
 562         struct datapath *dp;
 563
 564         dp = get_dp(dp_ifindex);
 565         if (!dp)
 566                 return -ENODEV;
 567
 568         old_table = get_table_protected(dp);
 569         new_table = tbl_create(TBL_MIN_BUCKETS);
 570         if (!new_table)
 571                 return -ENOMEM;
 572
 573         rcu_assign_pointer(dp->table, new_table);
 574
 575         tbl_deferred_destroy(old_table, flow_free_tbl);
 576
 577         return 0;
 578 }
 579
 580 static int validate_actions(const struct nlattr *attr)
 581 {
 582         const struct nlattr *a;
 583         int rem;
 584
 585         nla_for_each_nested(a, attr, rem) {
 586                 static const u32 action_lens[ODP_ACTION_ATTR_MAX + 1] = {
 587                         [ODP_ACTION_ATTR_OUTPUT] = 4,
 588                         [ODP_ACTION_ATTR_CONTROLLER] = 8,
 589                         [ODP_ACTION_ATTR_SET_DL_TCI] = 2,
 590                         [ODP_ACTION_ATTR_STRIP_VLAN] = 0,
 591                         [ODP_ACTION_ATTR_SET_DL_SRC] = ETH_ALEN,
 592                         [ODP_ACTION_ATTR_SET_DL_DST] = ETH_ALEN,
 593                         [ODP_ACTION_ATTR_SET_NW_SRC] = 4,
 594                         [ODP_ACTION_ATTR_SET_NW_DST] = 4,
 595                         [ODP_ACTION_ATTR_SET_NW_TOS] = 1,
 596                         [ODP_ACTION_ATTR_SET_TP_SRC] = 2,
 597                         [ODP_ACTION_ATTR_SET_TP_DST] = 2,
 598                         [ODP_ACTION_ATTR_SET_TUNNEL] = 8,
 599                         [ODP_ACTION_ATTR_SET_PRIORITY] = 4,
 600                         [ODP_ACTION_ATTR_POP_PRIORITY] = 0,
 601                         [ODP_ACTION_ATTR_DROP_SPOOFED_ARP] = 0,
 602                 };
 603                 int type = nla_type(a);
 604
 605                 if (type > ODP_ACTION_ATTR_MAX || nla_len(a) != action_lens[type])
 606                         return -EINVAL;
 607
 608                 switch (type) {
 609                 case ODP_ACTION_ATTR_UNSPEC:
 610                         return -EINVAL;
 611
 612                 case ODP_ACTION_ATTR_CONTROLLER:
 613                 case ODP_ACTION_ATTR_STRIP_VLAN:
 614                 case ODP_ACTION_ATTR_SET_DL_SRC:
 615                 case ODP_ACTION_ATTR_SET_DL_DST:
 616                 case ODP_ACTION_ATTR_SET_NW_SRC:
 617                 case ODP_ACTION_ATTR_SET_NW_DST:
 618                 case ODP_ACTION_ATTR_SET_TP_SRC:
 619                 case ODP_ACTION_ATTR_SET_TP_DST:
 620                 case ODP_ACTION_ATTR_SET_TUNNEL:
 621                 case ODP_ACTION_ATTR_SET_PRIORITY:
 622                 case ODP_ACTION_ATTR_POP_PRIORITY:
 623                 case ODP_ACTION_ATTR_DROP_SPOOFED_ARP:
 624                         /* No validation needed. */
 625                         break;
 626
 627                 case ODP_ACTION_ATTR_OUTPUT:
 628                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 629                                 return -EINVAL;
 630                         break;
 631
 632                 case ODP_ACTION_ATTR_SET_DL_TCI:
 633                         if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
 634                                 return -EINVAL;
 635                         break;
 636
 637                 case ODP_ACTION_ATTR_SET_NW_TOS:
 638                         if (nla_get_u8(a) & INET_ECN_MASK)
 639                                 return -EINVAL;
 640                         break;
 641
 642                 default:
 643                         return -EOPNOTSUPP;
 644                 }
 645         }
 646
 647         if (rem > 0)
 648                 return -EINVAL;
 649
 650         return 0;
 651 }
 652 static void clear_stats(struct sw_flow *flow)
 653 {
 654         flow->used = 0;
 655         flow->tcp_flags = 0;
 656         flow->packet_count = 0;
 657         flow->byte_count = 0;
 658 }
 659
 660 /* Called with genl_mutex. */
 661 static int expand_table(struct datapath *dp)
 662 {
 663         struct tbl *old_table = get_table_protected(dp);
 664         struct tbl *new_table;
 665
 666         new_table = tbl_expand(old_table);
 667         if (IS_ERR(new_table))
 668                 return PTR_ERR(new_table);
 669
 670         rcu_assign_pointer(dp->table, new_table);
 671         tbl_deferred_destroy(old_table, NULL);
 672
 673         return 0;
 674 }
 675
 676 static int odp_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 677 {
 678         struct odp_header *odp_header = info->userhdr;
 679         struct nlattr **a = info->attrs;
 680         struct sk_buff *packet;
 681         struct sw_flow_key key;
 682         struct datapath *dp;
 683         struct ethhdr *eth;
 684         bool is_frag;
 685         int err;
 686
 687         err = -EINVAL;
 688         if (!a[ODP_PACKET_ATTR_PACKET] || !a[ODP_PACKET_ATTR_ACTIONS] ||
 689             nla_len(a[ODP_PACKET_ATTR_PACKET]) < ETH_HLEN)
 690                 goto exit;
 691
 692         err = validate_actions(a[ODP_PACKET_ATTR_ACTIONS]);
 693         if (err)
 694                 goto exit;
 695
 696         packet = skb_clone(skb, GFP_KERNEL);
 697         err = -ENOMEM;
 698         if (!packet)
 699                 goto exit;
 700         packet->data = nla_data(a[ODP_PACKET_ATTR_PACKET]);
 701         packet->len = nla_len(a[ODP_PACKET_ATTR_PACKET]);
 702
 703         skb_reset_mac_header(packet);
 704         eth = eth_hdr(packet);
 705
 706         /* Normally, setting the skb 'protocol' field would be handled by a
 707          * call to eth_type_trans(), but it assumes there's a sending
 708          * device, which we may not have. */
 709         if (ntohs(eth->h_proto) >= 1536)
 710                 packet->protocol = eth->h_proto;
 711         else
 712                 packet->protocol = htons(ETH_P_802_2);
 713
 714         /* Initialize OVS_CB (it came from Netlink so might not be zeroed). */
 715         memset(OVS_CB(packet), 0, sizeof(struct ovs_skb_cb));
 716
 717         err = flow_extract(packet, -1, &key, &is_frag);
 718         if (err)
 719                 goto exit;
 720
 721         rcu_read_lock();
 722         dp = get_dp(odp_header->dp_ifindex);
 723         err = -ENODEV;
 724         if (dp)
 725                 err = execute_actions(dp, packet, &key,
 726                                       nla_data(a[ODP_PACKET_ATTR_ACTIONS]),
 727                                       nla_len(a[ODP_PACKET_ATTR_ACTIONS]));
 728         rcu_read_unlock();
 729
 730 exit:
 731         return err;
 732 }
 733
 734 static const struct nla_policy packet_policy[ODP_PACKET_ATTR_MAX + 1] = {
 735         [ODP_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 736         [ODP_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 737 };
 738
 739 static struct genl_ops dp_packet_genl_ops[] = {
 740         { .cmd = ODP_PACKET_CMD_EXECUTE,
 741           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 742           .policy = packet_policy,
 743           .doit = odp_packet_cmd_execute
 744         }
 745 };
 746
 747 static void get_dp_stats(struct datapath *dp, struct odp_stats *stats)
 748 {
 749         int i;
 750
 751         stats->n_frags = stats->n_hit = stats->n_missed = stats->n_lost = 0;
 752         for_each_possible_cpu(i) {
 753                 const struct dp_stats_percpu *percpu_stats;
 754                 struct dp_stats_percpu local_stats;
 755                 unsigned seqcount;
 756
 757                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 758
 759                 do {
 760                         seqcount = read_seqcount_begin(&percpu_stats->seqlock);
 761                         local_stats = *percpu_stats;
 762                 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
 763
 764                 stats->n_frags += local_stats.n_frags;
 765                 stats->n_hit += local_stats.n_hit;
 766                 stats->n_missed += local_stats.n_missed;
 767                 stats->n_lost += local_stats.n_lost;
 768         }
 769 }
 770
 771 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports.
 772  * Called with RTNL lock.
 773  */
 774 int dp_min_mtu(const struct datapath *dp)
 775 {
 776         struct vport *p;
 777         int mtu = 0;
 778
 779         ASSERT_RTNL();
 780
 781         list_for_each_entry (p, &dp->port_list, node) {
 782                 int dev_mtu;
 783
 784                 /* Skip any internal ports, since that's what we're trying to
 785                  * set. */
 786                 if (is_internal_vport(p))
 787                         continue;
 788
 789                 dev_mtu = vport_get_mtu(p);
 790                 if (!dev_mtu)
 791                         continue;
 792                 if (!mtu || dev_mtu < mtu)
 793                         mtu = dev_mtu;
 794         }
 795
 796         return mtu ? mtu : ETH_DATA_LEN;
 797 }
 798
 799 /* Sets the MTU of all datapath devices to the minimum of the ports
 800  * Called with RTNL lock.
 801  */
 802 void set_internal_devs_mtu(const struct datapath *dp)
 803 {
 804         struct vport *p;
 805         int mtu;
 806
 807         ASSERT_RTNL();
 808
 809         mtu = dp_min_mtu(dp);
 810
 811         list_for_each_entry (p, &dp->port_list, node) {
 812                 if (is_internal_vport(p))
 813                         vport_set_mtu(p, mtu);
 814         }
 815 }
 816
 817 static const struct nla_policy flow_policy[ODP_FLOW_ATTR_MAX + 1] = {
 818         [ODP_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 819         [ODP_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 820         [ODP_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 821 };
 822
 823 static struct genl_family dp_flow_genl_family = {
 824         .id = GENL_ID_GENERATE,
 825         .hdrsize = sizeof(struct odp_header),
 826         .name = ODP_FLOW_FAMILY,
 827         .version = 1,
 828         .maxattr = ODP_FLOW_ATTR_MAX
 829 };
 830
 831 static struct genl_multicast_group dp_flow_multicast_group = {
 832         .name = ODP_FLOW_MCGROUP
 833 };
 834
 835 /* Called with genl_lock. */
 836 static int odp_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 837                                   struct sk_buff *skb, u32 pid, u32 seq, u32 flags, u8 cmd)
 838 {
 839         const int skb_orig_len = skb->len;
 840         const struct sw_flow_actions *sf_acts;
 841         struct odp_flow_stats stats;
 842         struct odp_header *odp_header;
 843         struct nlattr *nla;
 844         unsigned long used;
 845         u8 tcp_flags;
 846         int err;
 847
 848         sf_acts = rcu_dereference_protected(flow->sf_acts,
 849                                             lockdep_genl_is_held());
 850
 851         odp_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
 852         if (!odp_header)
 853                 return -EMSGSIZE;
 854
 855         odp_header->dp_ifindex = dp->dp_ifindex;
 856
 857         nla = nla_nest_start(skb, ODP_FLOW_ATTR_KEY);
 858         if (!nla)
 859                 goto nla_put_failure;
 860         err = flow_to_nlattrs(&flow->key, skb);
 861         if (err)
 862                 goto error;
 863         nla_nest_end(skb, nla);
 864
 865         spin_lock_bh(&flow->lock);
 866         used = flow->used;
 867         stats.n_packets = flow->packet_count;
 868         stats.n_bytes = flow->byte_count;
 869         tcp_flags = flow->tcp_flags;
 870         spin_unlock_bh(&flow->lock);
 871
 872         if (used)
 873                 NLA_PUT_U64(skb, ODP_FLOW_ATTR_USED, flow_used_time(used));
 874
 875         if (stats.n_packets)
 876                 NLA_PUT(skb, ODP_FLOW_ATTR_STATS, sizeof(struct odp_flow_stats), &stats);
 877
 878         if (tcp_flags)
 879                 NLA_PUT_U8(skb, ODP_FLOW_ATTR_TCP_FLAGS, tcp_flags);
 880
 881         /* If ODP_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 882          * this is the first flow to be dumped into 'skb'.  This is unusual for
 883          * Netlink but individual action lists can be longer than
 884          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 885          * The userspace caller can always fetch the actions separately if it
 886          * really wants them.  (Most userspace callers in fact don't care.)
 887          *
 888          * This can only fail for dump operations because the skb is always
 889          * properly sized for single flows.
 890          */
 891         err = nla_put(skb, ODP_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 892                       sf_acts->actions);
 893         if (err < 0 && skb_orig_len)
 894                 goto error;
 895
 896         return genlmsg_end(skb, odp_header);
 897
 898 nla_put_failure:
 899         err = -EMSGSIZE;
 900 error:
 901         genlmsg_cancel(skb, odp_header);
 902         return err;
 903 }
 904
 905 static struct sk_buff *odp_flow_cmd_alloc_info(struct sw_flow *flow)
 906 {
 907         const struct sw_flow_actions *sf_acts;
 908         int len;
 909
 910         sf_acts = rcu_dereference_protected(flow->sf_acts,
 911                                             lockdep_genl_is_held());
 912
 913         len = nla_total_size(FLOW_BUFSIZE); /* ODP_FLOW_ATTR_KEY */
 914         len += nla_total_size(sf_acts->actions_len); /* ODP_FLOW_ATTR_ACTIONS */
 915         len += nla_total_size(sizeof(struct odp_flow_stats)); /* ODP_FLOW_ATTR_STATS */
 916         len += nla_total_size(1); /* ODP_FLOW_ATTR_TCP_FLAGS */
 917         len += nla_total_size(8); /* ODP_FLOW_ATTR_USED */
 918         return genlmsg_new(NLMSG_ALIGN(sizeof(struct odp_header)) + len, GFP_KERNEL);
 919 }
 920
 921 static struct sk_buff *odp_flow_cmd_build_info(struct sw_flow *flow, struct datapath *dp,
 922                                                u32 pid, u32 seq, u8 cmd)
 923 {
 924         struct sk_buff *skb;
 925         int retval;
 926
 927         skb = odp_flow_cmd_alloc_info(flow);
 928         if (!skb)
 929                 return ERR_PTR(-ENOMEM);
 930
 931         retval = odp_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
 932         BUG_ON(retval < 0);
 933         return skb;
 934 }
 935
 936 static int odp_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 937 {
 938         struct nlattr **a = info->attrs;
 939         struct odp_header *odp_header = info->userhdr;
 940         struct tbl_node *flow_node;
 941         struct sw_flow_key key;
 942         struct sw_flow *flow;
 943         struct sk_buff *reply;
 944         struct datapath *dp;
 945         struct tbl *table;
 946         u32 hash;
 947         int error;
 948
 949         /* Extract key. */
 950         error = -EINVAL;
 951         if (!a[ODP_FLOW_ATTR_KEY])
 952                 goto error;
 953         error = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
 954         if (error)
 955                 goto error;
 956
 957         /* Validate actions. */
 958         if (a[ODP_FLOW_ATTR_ACTIONS]) {
 959                 error = validate_actions(a[ODP_FLOW_ATTR_ACTIONS]);
 960                 if (error)
 961                         goto error;
 962         } else if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW) {
 963                 error = -EINVAL;
 964                 goto error;
 965         }
 966
 967         dp = get_dp(odp_header->dp_ifindex);
 968         error = -ENODEV;
 969         if (!dp)
 970                 goto error;
 971
 972         hash = flow_hash(&key);
 973         table = get_table_protected(dp);
 974         flow_node = tbl_lookup(table, &key, hash, flow_cmp);
 975         if (!flow_node) {
 976                 struct sw_flow_actions *acts;
 977
 978                 /* Bail out if we're not allowed to create a new flow. */
 979                 error = -ENOENT;
 980                 if (info->genlhdr->cmd == ODP_FLOW_CMD_SET)
 981                         goto error;
 982
 983                 /* Expand table, if necessary, to make room. */
 984                 if (tbl_count(table) >= tbl_n_buckets(table)) {
 985                         error = expand_table(dp);
 986                         if (error)
 987                                 goto error;
 988                         table = get_table_protected(dp);
 989                 }
 990
 991                 /* Allocate flow. */
 992                 flow = flow_alloc();
 993                 if (IS_ERR(flow)) {
 994                         error = PTR_ERR(flow);
 995                         goto error;
 996                 }
 997                 flow->key = key;
 998                 clear_stats(flow);
 999
1000                 /* Obtain actions. */
1001                 acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
1002                 error = PTR_ERR(acts);
1003                 if (IS_ERR(acts))
1004                         goto error_free_flow;
1005                 rcu_assign_pointer(flow->sf_acts, acts);
1006
1007                 /* Put flow in bucket. */
1008                 error = tbl_insert(table, &flow->tbl_node, hash);
1009                 if (error)
1010                         goto error_free_flow;
1011
1012                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1013                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1014         } else {
1015                 /* We found a matching flow. */
1016                 struct sw_flow_actions *old_acts;
1017
1018                 /* Bail out if we're not allowed to modify an existing flow.
1019                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1020                  * because Generic Netlink treats the latter as a dump
1021                  * request.  We also accept NLM_F_EXCL in case that bug ever
1022                  * gets fixed.
1023                  */
1024                 error = -EEXIST;
1025                 if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW &&
1026                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1027                         goto error;
1028
1029                 /* Update actions. */
1030                 flow = flow_cast(flow_node);
1031                 old_acts = rcu_dereference_protected(flow->sf_acts,
1032                                                      lockdep_genl_is_held());
1033                 if (a[ODP_FLOW_ATTR_ACTIONS] &&
1034                     (old_acts->actions_len != nla_len(a[ODP_FLOW_ATTR_ACTIONS]) ||
1035                      memcmp(old_acts->actions, nla_data(a[ODP_FLOW_ATTR_ACTIONS]),
1036                             old_acts->actions_len))) {
1037                         struct sw_flow_actions *new_acts;
1038
1039                         new_acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
1040                         error = PTR_ERR(new_acts);
1041                         if (IS_ERR(new_acts))
1042                                 goto error;
1043
1044                         rcu_assign_pointer(flow->sf_acts, new_acts);
1045                         flow_deferred_free_acts(old_acts);
1046                 }
1047
1048                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1049                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1050
1051                 /* Clear stats. */
1052                 if (a[ODP_FLOW_ATTR_CLEAR]) {
1053                         spin_lock_bh(&flow->lock);
1054                         clear_stats(flow);
1055                         spin_unlock_bh(&flow->lock);
1056                 }
1057         }
1058
1059         if (!IS_ERR(reply))
1060                 genl_notify(reply, genl_info_net(info), info->snd_pid,
1061                             dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1062         else
1063                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1064                                 dp_flow_multicast_group.id, PTR_ERR(reply));
1065         return 0;
1066
1067 error_free_flow:
1068         flow_put(flow);
1069 error:
1070         return error;
1071 }
1072
1073 static int odp_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1074 {
1075         struct nlattr **a = info->attrs;
1076         struct odp_header *odp_header = info->userhdr;
1077         struct sw_flow_key key;
1078         struct tbl_node *flow_node;
1079         struct sk_buff *reply;
1080         struct sw_flow *flow;
1081         struct datapath *dp;
1082         struct tbl *table;
1083         int err;
1084
1085         if (!a[ODP_FLOW_ATTR_KEY])
1086                 return -EINVAL;
1087         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1088         if (err)
1089                 return err;
1090
1091         dp = get_dp(odp_header->dp_ifindex);
1092         if (!dp)
1093                 return -ENODEV;
1094
1095         table = get_table_protected(dp);
1096         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1097         if (!flow_node)
1098                 return -ENOENT;
1099
1100         flow = flow_cast(flow_node);
1101         reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid, info->snd_seq, ODP_FLOW_CMD_NEW);
1102         if (IS_ERR(reply))
1103                 return PTR_ERR(reply);
1104
1105         return genlmsg_reply(reply, info);
1106 }
1107
1108 static int odp_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1109 {
1110         struct nlattr **a = info->attrs;
1111         struct odp_header *odp_header = info->userhdr;
1112         struct sw_flow_key key;
1113         struct tbl_node *flow_node;
1114         struct sk_buff *reply;
1115         struct sw_flow *flow;
1116         struct datapath *dp;
1117         struct tbl *table;
1118         int err;
1119
1120         if (!a[ODP_FLOW_ATTR_KEY])
1121                 return flush_flows(odp_header->dp_ifindex);
1122         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1123         if (err)
1124                 return err;
1125
1126         dp = get_dp(odp_header->dp_ifindex);
1127         if (!dp)
1128                 return -ENODEV;
1129
1130         table = get_table_protected(dp);
1131         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1132         if (!flow_node)
1133                 return -ENOENT;
1134         flow = flow_cast(flow_node);
1135
1136         reply = odp_flow_cmd_alloc_info(flow);
1137         if (!reply)
1138                 return -ENOMEM;
1139
1140         err = tbl_remove(table, flow_node);
1141         if (err) {
1142                 kfree_skb(reply);
1143                 return err;
1144         }
1145
1146         err = odp_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1147                                      info->snd_seq, 0, ODP_FLOW_CMD_DEL);
1148         BUG_ON(err < 0);
1149
1150         flow_deferred_free(flow);
1151
1152         genl_notify(reply, genl_info_net(info), info->snd_pid,
1153                     dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1154         return 0;
1155 }
1156
1157 static int odp_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1158 {
1159         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1160         struct datapath *dp;
1161
1162         dp = get_dp(odp_header->dp_ifindex);
1163         if (!dp)
1164                 return -ENODEV;
1165
1166         for (;;) {
1167                 struct tbl_node *flow_node;
1168                 struct sw_flow *flow;
1169                 u32 bucket, obj;
1170
1171                 bucket = cb->args[0];
1172                 obj = cb->args[1];
1173                 flow_node = tbl_next(get_table_protected(dp), &bucket, &obj);
1174                 if (!flow_node)
1175                         break;
1176
1177                 flow = flow_cast(flow_node);
1178                 if (odp_flow_cmd_fill_info(flow, dp, skb, NETLINK_CB(cb->skb).pid,
1179                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1180                                            ODP_FLOW_CMD_NEW) < 0)
1181                         break;
1182
1183                 cb->args[0] = bucket;
1184                 cb->args[1] = obj;
1185         }
1186         return skb->len;
1187 }
1188
1189 static struct genl_ops dp_flow_genl_ops[] = {
1190         { .cmd = ODP_FLOW_CMD_NEW,
1191           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1192           .policy = flow_policy,
1193           .doit = odp_flow_cmd_new_or_set
1194         },
1195         { .cmd = ODP_FLOW_CMD_DEL,
1196           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1197           .policy = flow_policy,
1198           .doit = odp_flow_cmd_del
1199         },
1200         { .cmd = ODP_FLOW_CMD_GET,
1201           .flags = 0,               /* OK for unprivileged users. */
1202           .policy = flow_policy,
1203           .doit = odp_flow_cmd_get,
1204           .dumpit = odp_flow_cmd_dump
1205         },
1206         { .cmd = ODP_FLOW_CMD_SET,
1207           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1208           .policy = flow_policy,
1209           .doit = odp_flow_cmd_new_or_set,
1210         },
1211 };
1212
1213 static const struct nla_policy datapath_policy[ODP_DP_ATTR_MAX + 1] = {
1214 #ifdef HAVE_NLA_NUL_STRING
1215         [ODP_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1216 #endif
1217         [ODP_DP_ATTR_IPV4_FRAGS] = { .type = NLA_U32 },
1218         [ODP_DP_ATTR_SAMPLING] = { .type = NLA_U32 },
1219 };
1220
1221 static struct genl_family dp_datapath_genl_family = {
1222         .id = GENL_ID_GENERATE,
1223         .hdrsize = sizeof(struct odp_header),
1224         .name = ODP_DATAPATH_FAMILY,
1225         .version = 1,
1226         .maxattr = ODP_DP_ATTR_MAX
1227 };
1228
1229 static struct genl_multicast_group dp_datapath_multicast_group = {
1230         .name = ODP_DATAPATH_MCGROUP
1231 };
1232
1233 static int odp_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1234                                 u32 pid, u32 seq, u32 flags, u8 cmd)
1235 {
1236         struct odp_header *odp_header;
1237         struct nlattr *nla;
1238         int err;
1239
1240         odp_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1241                                    flags, cmd);
1242         if (!odp_header)
1243                 goto error;
1244
1245         odp_header->dp_ifindex = dp->dp_ifindex;
1246
1247         rcu_read_lock();
1248         err = nla_put_string(skb, ODP_DP_ATTR_NAME, dp_name(dp));
1249         rcu_read_unlock();
1250         if (err)
1251                 goto nla_put_failure;
1252
1253         nla = nla_reserve(skb, ODP_DP_ATTR_STATS, sizeof(struct odp_stats));
1254         if (!nla)
1255                 goto nla_put_failure;
1256         get_dp_stats(dp, nla_data(nla));
1257
1258         NLA_PUT_U32(skb, ODP_DP_ATTR_IPV4_FRAGS,
1259                     dp->drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO);
1260
1261         if (dp->sflow_probability)
1262                 NLA_PUT_U32(skb, ODP_DP_ATTR_SAMPLING, dp->sflow_probability);
1263
1264         nla = nla_nest_start(skb, ODP_DP_ATTR_MCGROUPS);
1265         if (!nla)
1266                 goto nla_put_failure;
1267         NLA_PUT_U32(skb, ODP_PACKET_CMD_MISS, packet_mc_group(dp, ODP_PACKET_CMD_MISS));
1268         NLA_PUT_U32(skb, ODP_PACKET_CMD_ACTION, packet_mc_group(dp, ODP_PACKET_CMD_ACTION));
1269         NLA_PUT_U32(skb, ODP_PACKET_CMD_SAMPLE, packet_mc_group(dp, ODP_PACKET_CMD_SAMPLE));
1270         nla_nest_end(skb, nla);
1271
1272         return genlmsg_end(skb, odp_header);
1273
1274 nla_put_failure:
1275         genlmsg_cancel(skb, odp_header);
1276 error:
1277         return -EMSGSIZE;
1278 }
1279
1280 static struct sk_buff *odp_dp_cmd_build_info(struct datapath *dp, u32 pid,
1281                                              u32 seq, u8 cmd)
1282 {
1283         struct sk_buff *skb;
1284         int retval;
1285
1286         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1287         if (!skb)
1288                 return ERR_PTR(-ENOMEM);
1289
1290         retval = odp_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1291         if (retval < 0) {
1292                 kfree_skb(skb);
1293                 return ERR_PTR(retval);
1294         }
1295         return skb;
1296 }
1297
1298 static int odp_dp_cmd_validate(struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1299 {
1300         if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
1301                 u32 frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
1302
1303                 if (frags != ODP_DP_FRAG_ZERO && frags != ODP_DP_FRAG_DROP)
1304                         return -EINVAL;
1305         }
1306
1307         return CHECK_NUL_STRING(a[ODP_DP_ATTR_NAME], IFNAMSIZ - 1);
1308 }
1309
1310 /* Called with genl_mutex and optionally with RTNL lock also. */
1311 static struct datapath *lookup_datapath(struct odp_header *odp_header, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1312 {
1313         struct datapath *dp;
1314
1315         if (!a[ODP_DP_ATTR_NAME])
1316                 dp = get_dp(odp_header->dp_ifindex);
1317         else {
1318                 struct vport *vport;
1319
1320                 rcu_read_lock();
1321                 vport = vport_locate(nla_data(a[ODP_DP_ATTR_NAME]));
1322                 dp = vport && vport->port_no == ODPP_LOCAL ? vport->dp : NULL;
1323                 rcu_read_unlock();
1324         }
1325         return dp ? dp : ERR_PTR(-ENODEV);
1326 }
1327
1328 /* Called with genl_mutex. */
1329 static void change_datapath(struct datapath *dp, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1330 {
1331         if (a[ODP_DP_ATTR_IPV4_FRAGS])
1332                 dp->drop_frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]) == ODP_DP_FRAG_DROP;
1333         if (a[ODP_DP_ATTR_SAMPLING])
1334                 dp->sflow_probability = nla_get_u32(a[ODP_DP_ATTR_SAMPLING]);
1335 }
1336
1337 static int odp_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1338 {
1339         struct nlattr **a = info->attrs;
1340         struct vport_parms parms;
1341         struct sk_buff *reply;
1342         struct datapath *dp;
1343         struct vport *vport;
1344         int err;
1345
1346         err = -EINVAL;
1347         if (!a[ODP_DP_ATTR_NAME])
1348                 goto err;
1349
1350         err = odp_dp_cmd_validate(a);
1351         if (err)
1352                 goto err;
1353
1354         rtnl_lock();
1355         err = -ENODEV;
1356         if (!try_module_get(THIS_MODULE))
1357                 goto err_unlock_rtnl;
1358
1359         err = -ENOMEM;
1360         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1361         if (dp == NULL)
1362                 goto err_put_module;
1363         INIT_LIST_HEAD(&dp->port_list);
1364
1365         /* Initialize kobject for bridge.  This will be added as
1366          * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1367         dp->ifobj.kset = NULL;
1368         kobject_init(&dp->ifobj, &dp_ktype);
1369
1370         /* Allocate table. */
1371         err = -ENOMEM;
1372         rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
1373         if (!dp->table)
1374                 goto err_free_dp;
1375
1376         /* Set up our datapath device. */
1377         parms.name = nla_data(a[ODP_DP_ATTR_NAME]);
1378         parms.type = ODP_VPORT_TYPE_INTERNAL;
1379         parms.options = NULL;
1380         parms.dp = dp;
1381         parms.port_no = ODPP_LOCAL;
1382         vport = new_vport(&parms);
1383         if (IS_ERR(vport)) {
1384                 err = PTR_ERR(vport);
1385                 if (err == -EBUSY)
1386                         err = -EEXIST;
1387
1388                 goto err_destroy_table;
1389         }
1390         dp->dp_ifindex = vport_get_ifindex(vport);
1391
1392         dp->drop_frags = 0;
1393         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1394         if (!dp->stats_percpu) {
1395                 err = -ENOMEM;
1396                 goto err_destroy_local_port;
1397         }
1398
1399         change_datapath(dp, a);
1400
1401         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1402         err = PTR_ERR(reply);
1403         if (IS_ERR(reply))
1404                 goto err_destroy_local_port;
1405
1406         list_add_tail(&dp->list_node, &dps);
1407         dp_sysfs_add_dp(dp);
1408
1409         rtnl_unlock();
1410
1411         genl_notify(reply, genl_info_net(info), info->snd_pid,
1412                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1413         return 0;
1414
1415 err_destroy_local_port:
1416         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1417 err_destroy_table:
1418         tbl_destroy(get_table_protected(dp), NULL);
1419 err_free_dp:
1420         kfree(dp);
1421 err_put_module:
1422         module_put(THIS_MODULE);
1423 err_unlock_rtnl:
1424         rtnl_unlock();
1425 err:
1426         return err;
1427 }
1428
1429 static int odp_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1430 {
1431         struct vport *vport, *next_vport;
1432         struct sk_buff *reply;
1433         struct datapath *dp;
1434         int err;
1435
1436         err = odp_dp_cmd_validate(info->attrs);
1437         if (err)
1438                 goto exit;
1439
1440         rtnl_lock();
1441         dp = lookup_datapath(info->userhdr, info->attrs);
1442         err = PTR_ERR(dp);
1443         if (IS_ERR(dp))
1444                 goto exit_unlock;
1445
1446         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_DEL);
1447         err = PTR_ERR(reply);
1448         if (IS_ERR(reply))
1449                 goto exit_unlock;
1450
1451         list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
1452                 if (vport->port_no != ODPP_LOCAL)
1453                         dp_detach_port(vport);
1454
1455         dp_sysfs_del_dp(dp);
1456         list_del(&dp->list_node);
1457         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1458
1459         /* rtnl_unlock() will wait until all the references to devices that
1460          * are pending unregistration have been dropped.  We do it here to
1461          * ensure that any internal devices (which contain DP pointers) are
1462          * fully destroyed before freeing the datapath.
1463          */
1464         rtnl_unlock();
1465
1466         call_rcu(&dp->rcu, destroy_dp_rcu);
1467         module_put(THIS_MODULE);
1468
1469         genl_notify(reply, genl_info_net(info), info->snd_pid,
1470                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1471
1472         return 0;
1473
1474 exit_unlock:
1475         rtnl_unlock();
1476 exit:
1477         return err;
1478 }
1479
1480 static int odp_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1481 {
1482         struct sk_buff *reply;
1483         struct datapath *dp;
1484         int err;
1485
1486         err = odp_dp_cmd_validate(info->attrs);
1487         if (err)
1488                 return err;
1489
1490         dp = lookup_datapath(info->userhdr, info->attrs);
1491         if (IS_ERR(dp))
1492                 return PTR_ERR(dp);
1493
1494         change_datapath(dp, info->attrs);
1495
1496         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1497         if (IS_ERR(reply)) {
1498                 err = PTR_ERR(reply);
1499                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1500                                 dp_datapath_multicast_group.id, err);
1501                 return 0;
1502         }
1503
1504         genl_notify(reply, genl_info_net(info), info->snd_pid,
1505                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1506         return 0;
1507 }
1508
1509 static int odp_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1510 {
1511         struct sk_buff *reply;
1512         struct datapath *dp;
1513         int err;
1514
1515         err = odp_dp_cmd_validate(info->attrs);
1516         if (err)
1517                 return err;
1518
1519         dp = lookup_datapath(info->userhdr, info->attrs);
1520         if (IS_ERR(dp))
1521                 return PTR_ERR(dp);
1522
1523         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1524         if (IS_ERR(reply))
1525                 return PTR_ERR(reply);
1526
1527         return genlmsg_reply(reply, info);
1528 }
1529
1530 static int odp_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1531 {
1532         struct datapath *dp;
1533         int skip = cb->args[0];
1534         int i = 0;
1535
1536         list_for_each_entry (dp, &dps, list_node) {
1537                 if (i < skip)
1538                         continue;
1539                 if (odp_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1540                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1541                                          ODP_DP_CMD_NEW) < 0)
1542                         break;
1543                 i++;
1544         }
1545
1546         cb->args[0] = i;
1547
1548         return skb->len;
1549 }
1550
1551 static struct genl_ops dp_datapath_genl_ops[] = {
1552         { .cmd = ODP_DP_CMD_NEW,
1553           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1554           .policy = datapath_policy,
1555           .doit = odp_dp_cmd_new
1556         },
1557         { .cmd = ODP_DP_CMD_DEL,
1558           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1559           .policy = datapath_policy,
1560           .doit = odp_dp_cmd_del
1561         },
1562         { .cmd = ODP_DP_CMD_GET,
1563           .flags = 0,               /* OK for unprivileged users. */
1564           .policy = datapath_policy,
1565           .doit = odp_dp_cmd_get,
1566           .dumpit = odp_dp_cmd_dump
1567         },
1568         { .cmd = ODP_DP_CMD_SET,
1569           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1570           .policy = datapath_policy,
1571           .doit = odp_dp_cmd_set,
1572         },
1573 };
1574
1575 static const struct nla_policy vport_policy[ODP_VPORT_ATTR_MAX + 1] = {
1576 #ifdef HAVE_NLA_NUL_STRING
1577         [ODP_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1578         [ODP_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1579         [ODP_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1580         [ODP_VPORT_ATTR_STATS] = { .len = sizeof(struct rtnl_link_stats64) },
1581         [ODP_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1582 #else
1583         [ODP_VPORT_ATTR_STATS] = { .minlen = sizeof(struct rtnl_link_stats64) },
1584         [ODP_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1585 #endif
1586         [ODP_VPORT_ATTR_MTU] = { .type = NLA_U32 },
1587         [ODP_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1588 };
1589
1590 static struct genl_family dp_vport_genl_family = {
1591         .id = GENL_ID_GENERATE,
1592         .hdrsize = sizeof(struct odp_header),
1593         .name = ODP_VPORT_FAMILY,
1594         .version = 1,
1595         .maxattr = ODP_VPORT_ATTR_MAX
1596 };
1597
1598 static struct genl_multicast_group dp_vport_multicast_group = {
1599         .name = ODP_VPORT_MCGROUP
1600 };
1601
1602 /* Called with RTNL lock or RCU read lock. */
1603 static int odp_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1604                                    u32 pid, u32 seq, u32 flags, u8 cmd)
1605 {
1606         struct odp_header *odp_header;
1607         struct nlattr *nla;
1608         int ifindex, iflink;
1609         int mtu;
1610         int err;
1611
1612         odp_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1613                                  flags, cmd);
1614         if (!odp_header)
1615                 return -EMSGSIZE;
1616
1617         odp_header->dp_ifindex = vport->dp->dp_ifindex;
1618
1619         NLA_PUT_U32(skb, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
1620         NLA_PUT_U32(skb, ODP_VPORT_ATTR_TYPE, vport_get_type(vport));
1621         NLA_PUT_STRING(skb, ODP_VPORT_ATTR_NAME, vport_get_name(vport));
1622
1623         nla = nla_reserve(skb, ODP_VPORT_ATTR_STATS, sizeof(struct rtnl_link_stats64));
1624         if (!nla)
1625                 goto nla_put_failure;
1626         if (vport_get_stats(vport, nla_data(nla)))
1627                 __skb_trim(skb, skb->len - nla->nla_len);
1628
1629         NLA_PUT(skb, ODP_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
1630
1631         mtu = vport_get_mtu(vport);
1632         if (mtu)
1633                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_MTU, mtu);
1634
1635         err = vport_get_options(vport, skb);
1636         if (err == -EMSGSIZE)
1637                 goto error;
1638
1639         ifindex = vport_get_ifindex(vport);
1640         if (ifindex > 0)
1641                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFINDEX, ifindex);
1642
1643         iflink = vport_get_iflink(vport);
1644         if (iflink > 0)
1645                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFLINK, iflink);
1646
1647         return genlmsg_end(skb, odp_header);
1648
1649 nla_put_failure:
1650         err = -EMSGSIZE;
1651 error:
1652         genlmsg_cancel(skb, odp_header);
1653         return err;
1654 }
1655
1656 /* Called with RTNL lock or RCU read lock. */
1657 static struct sk_buff *odp_vport_cmd_build_info(struct vport *vport, u32 pid,
1658                                                 u32 seq, u8 cmd)
1659 {
1660         struct sk_buff *skb;
1661         int retval;
1662
1663         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1664         if (!skb)
1665                 return ERR_PTR(-ENOMEM);
1666
1667         retval = odp_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1668         if (retval < 0) {
1669                 kfree_skb(skb);
1670                 return ERR_PTR(retval);
1671         }
1672         return skb;
1673 }
1674
1675 static int odp_vport_cmd_validate(struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1676 {
1677         return CHECK_NUL_STRING(a[ODP_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1678 }
1679
1680 /* Called with RTNL lock or RCU read lock. */
1681 static struct vport *lookup_vport(struct odp_header *odp_header,
1682                                   struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1683 {
1684         struct datapath *dp;
1685         struct vport *vport;
1686
1687         if (a[ODP_VPORT_ATTR_NAME]) {
1688                 vport = vport_locate(nla_data(a[ODP_VPORT_ATTR_NAME]));
1689                 if (!vport)
1690                         return ERR_PTR(-ENODEV);
1691                 return vport;
1692         } else if (a[ODP_VPORT_ATTR_PORT_NO]) {
1693                 u32 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1694
1695                 if (port_no >= DP_MAX_PORTS)
1696                         return ERR_PTR(-EFBIG);
1697
1698                 dp = get_dp(odp_header->dp_ifindex);
1699                 if (!dp)
1700                         return ERR_PTR(-ENODEV);
1701
1702                 vport = get_vport_protected(dp, port_no);
1703                 if (!vport)
1704                         return ERR_PTR(-ENOENT);
1705                 return vport;
1706         } else
1707                 return ERR_PTR(-EINVAL);
1708 }
1709
1710 /* Called with RTNL lock. */
1711 static int change_vport(struct vport *vport, struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1712 {
1713         int err = 0;
1714         if (a[ODP_VPORT_ATTR_STATS])
1715                 err = vport_set_stats(vport, nla_data(a[ODP_VPORT_ATTR_STATS]));
1716         if (!err && a[ODP_VPORT_ATTR_ADDRESS])
1717                 err = vport_set_addr(vport, nla_data(a[ODP_VPORT_ATTR_ADDRESS]));
1718         if (!err && a[ODP_VPORT_ATTR_MTU])
1719                 err = vport_set_mtu(vport, nla_get_u32(a[ODP_VPORT_ATTR_MTU]));
1720         return err;
1721 }
1722
1723 static int odp_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1724 {
1725         struct nlattr **a = info->attrs;
1726         struct odp_header *odp_header = info->userhdr;
1727         struct vport_parms parms;
1728         struct sk_buff *reply;
1729         struct vport *vport;
1730         struct datapath *dp;
1731         u32 port_no;
1732         int err;
1733
1734         err = -EINVAL;
1735         if (!a[ODP_VPORT_ATTR_NAME] || !a[ODP_VPORT_ATTR_TYPE])
1736                 goto exit;
1737
1738         err = odp_vport_cmd_validate(a);
1739         if (err)
1740                 goto exit;
1741
1742         rtnl_lock();
1743         dp = get_dp(odp_header->dp_ifindex);
1744         err = -ENODEV;
1745         if (!dp)
1746                 goto exit_unlock;
1747
1748         if (a[ODP_VPORT_ATTR_PORT_NO]) {
1749                 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1750
1751                 err = -EFBIG;
1752                 if (port_no >= DP_MAX_PORTS)
1753                         goto exit_unlock;
1754
1755                 vport = get_vport_protected(dp, port_no);
1756                 err = -EBUSY;
1757                 if (vport)
1758                         goto exit_unlock;
1759         } else {
1760                 for (port_no = 1; ; port_no++) {
1761                         if (port_no >= DP_MAX_PORTS) {
1762                                 err = -EFBIG;
1763                                 goto exit_unlock;
1764                         }
1765                         vport = get_vport_protected(dp, port_no);
1766                         if (!vport)
1767                                 break;
1768                 }
1769         }
1770
1771         parms.name = nla_data(a[ODP_VPORT_ATTR_NAME]);
1772         parms.type = nla_get_u32(a[ODP_VPORT_ATTR_TYPE]);
1773         parms.options = a[ODP_VPORT_ATTR_OPTIONS];
1774         parms.dp = dp;
1775         parms.port_no = port_no;
1776
1777         vport = new_vport(&parms);
1778         err = PTR_ERR(vport);
1779         if (IS_ERR(vport))
1780                 goto exit_unlock;
1781
1782         set_internal_devs_mtu(dp);
1783         dp_sysfs_add_if(vport);
1784
1785         err = change_vport(vport, a);
1786         if (!err) {
1787                 reply = odp_vport_cmd_build_info(vport, info->snd_pid,
1788                                                  info->snd_seq, ODP_VPORT_CMD_NEW);
1789                 if (IS_ERR(reply))
1790                         err = PTR_ERR(reply);
1791         }
1792         if (err) {
1793                 dp_detach_port(vport);
1794                 goto exit_unlock;
1795         }
1796         genl_notify(reply, genl_info_net(info), info->snd_pid,
1797                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1798
1799
1800 exit_unlock:
1801         rtnl_unlock();
1802 exit:
1803         return err;
1804 }
1805
1806 static int odp_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1807 {
1808         struct nlattr **a = info->attrs;
1809         struct sk_buff *reply;
1810         struct vport *vport;
1811         int err;
1812
1813         err = odp_vport_cmd_validate(a);
1814         if (err)
1815                 goto exit;
1816
1817         rtnl_lock();
1818         vport = lookup_vport(info->userhdr, a);
1819         err = PTR_ERR(vport);
1820         if (IS_ERR(vport))
1821                 goto exit_unlock;
1822
1823         err = 0;
1824         if (a[ODP_VPORT_ATTR_OPTIONS])
1825                 err = vport_set_options(vport, a[ODP_VPORT_ATTR_OPTIONS]);
1826         if (!err)
1827                 err = change_vport(vport, a);
1828
1829         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1830                                          ODP_VPORT_CMD_NEW);
1831         if (IS_ERR(reply)) {
1832                 err = PTR_ERR(reply);
1833                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1834                                 dp_vport_multicast_group.id, err);
1835                 return 0;
1836         }
1837
1838         genl_notify(reply, genl_info_net(info), info->snd_pid,
1839                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1840
1841 exit_unlock:
1842         rtnl_unlock();
1843 exit:
1844         return err;
1845 }
1846
1847 static int odp_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1848 {
1849         struct nlattr **a = info->attrs;
1850         struct sk_buff *reply;
1851         struct vport *vport;
1852         int err;
1853
1854         err = odp_vport_cmd_validate(a);
1855         if (err)
1856                 goto exit;
1857
1858         rtnl_lock();
1859         vport = lookup_vport(info->userhdr, a);
1860         err = PTR_ERR(vport);
1861         if (IS_ERR(vport))
1862                 goto exit_unlock;
1863
1864         if (vport->port_no == ODPP_LOCAL) {
1865                 err = -EINVAL;
1866                 goto exit_unlock;
1867         }
1868
1869         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1870                                          ODP_VPORT_CMD_DEL);
1871         err = PTR_ERR(reply);
1872         if (IS_ERR(reply))
1873                 goto exit_unlock;
1874
1875         err = dp_detach_port(vport);
1876
1877         genl_notify(reply, genl_info_net(info), info->snd_pid,
1878                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1879
1880 exit_unlock:
1881         rtnl_unlock();
1882 exit:
1883         return err;
1884 }
1885
1886 static int odp_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1887 {
1888         struct nlattr **a = info->attrs;
1889         struct odp_header *odp_header = info->userhdr;
1890         struct sk_buff *reply;
1891         struct vport *vport;
1892         int err;
1893
1894         err = odp_vport_cmd_validate(a);
1895         if (err)
1896                 goto exit;
1897
1898         rcu_read_lock();
1899         vport = lookup_vport(odp_header, a);
1900         err = PTR_ERR(vport);
1901         if (IS_ERR(vport))
1902                 goto exit_unlock;
1903
1904         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1905                                          ODP_VPORT_CMD_NEW);
1906         err = PTR_ERR(reply);
1907         if (IS_ERR(reply))
1908                 goto exit_unlock;
1909
1910         err = genlmsg_reply(reply, info);
1911
1912 exit_unlock:
1913         rcu_read_unlock();
1914 exit:
1915         return err;
1916 }
1917
1918 static int odp_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1919 {
1920         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1921         struct datapath *dp;
1922         u32 port_no;
1923         int retval;
1924
1925         dp = get_dp(odp_header->dp_ifindex);
1926         if (!dp)
1927                 return -ENODEV;
1928
1929         rcu_read_lock();
1930         for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1931                 struct vport *vport;
1932
1933                 vport = get_vport_protected(dp, port_no);
1934                 if (!vport)
1935                         continue;
1936
1937                 if (odp_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1938                                             cb->nlh->nlmsg_seq, NLM_F_MULTI,
1939                                             ODP_VPORT_CMD_NEW) < 0)
1940                         break;
1941         }
1942         rcu_read_unlock();
1943
1944         cb->args[0] = port_no;
1945         retval = skb->len;
1946
1947         return retval;
1948 }
1949
1950 static struct genl_ops dp_vport_genl_ops[] = {
1951         { .cmd = ODP_VPORT_CMD_NEW,
1952           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1953           .policy = vport_policy,
1954           .doit = odp_vport_cmd_new
1955         },
1956         { .cmd = ODP_VPORT_CMD_DEL,
1957           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1958           .policy = vport_policy,
1959           .doit = odp_vport_cmd_del
1960         },
1961         { .cmd = ODP_VPORT_CMD_GET,
1962           .flags = 0,               /* OK for unprivileged users. */
1963           .policy = vport_policy,
1964           .doit = odp_vport_cmd_get,
1965           .dumpit = odp_vport_cmd_dump
1966         },
1967         { .cmd = ODP_VPORT_CMD_SET,
1968           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1969           .policy = vport_policy,
1970           .doit = odp_vport_cmd_set,
1971         },
1972 };
1973
1974 struct genl_family_and_ops {
1975         struct genl_family *family;
1976         struct genl_ops *ops;
1977         int n_ops;
1978         struct genl_multicast_group *group;
1979 };
1980
1981 static const struct genl_family_and_ops dp_genl_families[] = {
1982         { &dp_datapath_genl_family,
1983           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1984           &dp_datapath_multicast_group },
1985         { &dp_vport_genl_family,
1986           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1987           &dp_vport_multicast_group },
1988         { &dp_flow_genl_family,
1989           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1990           &dp_flow_multicast_group },
1991         { &dp_packet_genl_family,
1992           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1993           NULL },
1994 };
1995
1996 static void dp_unregister_genl(int n_families)
1997 {
1998         int i;
1999
2000         for (i = 0; i < n_families; i++) {
2001                 genl_unregister_family(dp_genl_families[i].family);
2002         }
2003 }
2004
2005 static int dp_register_genl(void)
2006 {
2007         int n_registered;
2008         int err;
2009         int i;
2010
2011         n_registered = 0;
2012         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2013                 const struct genl_family_and_ops *f = &dp_genl_families[i];
2014
2015                 err = genl_register_family_with_ops(f->family, f->ops,
2016                                                     f->n_ops);
2017                 if (err)
2018                         goto error;
2019                 n_registered++;
2020
2021                 if (f->group) {
2022                         err = genl_register_mc_group(f->family, f->group);
2023                         if (err)
2024                                 goto error;
2025                 }
2026         }
2027
2028         err = packet_register_mc_groups();
2029         if (err)
2030                 goto error;
2031         return 0;
2032
2033 error:
2034         dp_unregister_genl(n_registered);
2035         return err;
2036 }
2037
2038 static int __init dp_init(void)
2039 {
2040         struct sk_buff *dummy_skb;
2041         int err;
2042
2043         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2044
2045         printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2046
2047         err = flow_init();
2048         if (err)
2049                 goto error;
2050
2051         err = vport_init();
2052         if (err)
2053                 goto error_flow_exit;
2054
2055         err = register_netdevice_notifier(&dp_device_notifier);
2056         if (err)
2057                 goto error_vport_exit;
2058
2059         err = dp_register_genl();
2060         if (err < 0)
2061                 goto error_unreg_notifier;
2062
2063         return 0;
2064
2065 error_unreg_notifier:
2066         unregister_netdevice_notifier(&dp_device_notifier);
2067 error_vport_exit:
2068         vport_exit();
2069 error_flow_exit:
2070         flow_exit();
2071 error:
2072         return err;
2073 }
2074
2075 static void dp_cleanup(void)
2076 {
2077         rcu_barrier();
2078         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2079         unregister_netdevice_notifier(&dp_device_notifier);
2080         vport_exit();
2081         flow_exit();
2082 }
2083
2084 module_init(dp_init);
2085 module_exit(dp_cleanup);
2086
2087 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2088 MODULE_LICENSE("GPL");