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 sw_flow_actions *acts;
 681         struct sk_buff *packet;
 682         struct sw_flow *flow;
 683         struct datapath *dp;
 684         struct ethhdr *eth;
 685         bool is_frag;
 686         int len;
 687         int err;
 688
 689         err = -EINVAL;
 690         if (!a[ODP_PACKET_ATTR_PACKET] || !a[ODP_PACKET_ATTR_ACTIONS] ||
 691             nla_len(a[ODP_PACKET_ATTR_PACKET]) < ETH_HLEN)
 692                 goto err;
 693
 694         err = validate_actions(a[ODP_PACKET_ATTR_ACTIONS]);
 695         if (err)
 696                 goto err;
 697
 698         len = nla_len(a[ODP_PACKET_ATTR_PACKET]);
 699         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 700         err = -ENOMEM;
 701         if (!packet)
 702                 goto err;
 703         skb_reserve(packet, NET_IP_ALIGN);
 704
 705         memcpy(__skb_put(packet, len), nla_data(a[ODP_PACKET_ATTR_PACKET]), len);
 706
 707         skb_reset_mac_header(packet);
 708         eth = eth_hdr(packet);
 709
 710         /* Normally, setting the skb 'protocol' field would be handled by a
 711          * call to eth_type_trans(), but it assumes there's a sending
 712          * device, which we may not have. */
 713         if (ntohs(eth->h_proto) >= 1536)
 714                 packet->protocol = eth->h_proto;
 715         else
 716                 packet->protocol = htons(ETH_P_802_2);
 717
 718         /* Build an sw_flow for sending this packet. */
 719         flow = flow_alloc();
 720         err = PTR_ERR(flow);
 721         if (IS_ERR(flow))
 722                 goto err_kfree_skb;
 723
 724         err = flow_extract(packet, -1, &flow->key, &is_frag);
 725         if (err)
 726                 goto err_flow_put;
 727         flow->tbl_node.hash = flow_hash(&flow->key);
 728
 729         acts = flow_actions_alloc(a[ODP_PACKET_ATTR_ACTIONS]);
 730         err = PTR_ERR(acts);
 731         if (IS_ERR(acts))
 732                 goto err_flow_put;
 733         rcu_assign_pointer(flow->sf_acts, acts);
 734
 735         OVS_CB(packet)->flow = flow;
 736
 737         rcu_read_lock();
 738         dp = get_dp(odp_header->dp_ifindex);
 739         err = -ENODEV;
 740         if (!dp)
 741                 goto err_unlock;
 742         err = execute_actions(dp, packet, &flow->key,
 743                               nla_data(a[ODP_PACKET_ATTR_ACTIONS]),
 744                               nla_len(a[ODP_PACKET_ATTR_ACTIONS]));
 745         rcu_read_unlock();
 746
 747         flow_put(flow);
 748         return err;
 749
 750 err_unlock:
 751         rcu_read_unlock();
 752 err_flow_put:
 753         flow_put(flow);
 754 err_kfree_skb:
 755         kfree_skb(packet);
 756 err:
 757         return err;
 758 }
 759
 760 static const struct nla_policy packet_policy[ODP_PACKET_ATTR_MAX + 1] = {
 761         [ODP_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 762         [ODP_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 763 };
 764
 765 static struct genl_ops dp_packet_genl_ops[] = {
 766         { .cmd = ODP_PACKET_CMD_EXECUTE,
 767           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 768           .policy = packet_policy,
 769           .doit = odp_packet_cmd_execute
 770         }
 771 };
 772
 773 static void get_dp_stats(struct datapath *dp, struct odp_stats *stats)
 774 {
 775         int i;
 776
 777         stats->n_frags = stats->n_hit = stats->n_missed = stats->n_lost = 0;
 778         for_each_possible_cpu(i) {
 779                 const struct dp_stats_percpu *percpu_stats;
 780                 struct dp_stats_percpu local_stats;
 781                 unsigned seqcount;
 782
 783                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 784
 785                 do {
 786                         seqcount = read_seqcount_begin(&percpu_stats->seqlock);
 787                         local_stats = *percpu_stats;
 788                 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
 789
 790                 stats->n_frags += local_stats.n_frags;
 791                 stats->n_hit += local_stats.n_hit;
 792                 stats->n_missed += local_stats.n_missed;
 793                 stats->n_lost += local_stats.n_lost;
 794         }
 795 }
 796
 797 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports.
 798  * Called with RTNL lock.
 799  */
 800 int dp_min_mtu(const struct datapath *dp)
 801 {
 802         struct vport *p;
 803         int mtu = 0;
 804
 805         ASSERT_RTNL();
 806
 807         list_for_each_entry (p, &dp->port_list, node) {
 808                 int dev_mtu;
 809
 810                 /* Skip any internal ports, since that's what we're trying to
 811                  * set. */
 812                 if (is_internal_vport(p))
 813                         continue;
 814
 815                 dev_mtu = vport_get_mtu(p);
 816                 if (!dev_mtu)
 817                         continue;
 818                 if (!mtu || dev_mtu < mtu)
 819                         mtu = dev_mtu;
 820         }
 821
 822         return mtu ? mtu : ETH_DATA_LEN;
 823 }
 824
 825 /* Sets the MTU of all datapath devices to the minimum of the ports
 826  * Called with RTNL lock.
 827  */
 828 void set_internal_devs_mtu(const struct datapath *dp)
 829 {
 830         struct vport *p;
 831         int mtu;
 832
 833         ASSERT_RTNL();
 834
 835         mtu = dp_min_mtu(dp);
 836
 837         list_for_each_entry (p, &dp->port_list, node) {
 838                 if (is_internal_vport(p))
 839                         vport_set_mtu(p, mtu);
 840         }
 841 }
 842
 843 static const struct nla_policy flow_policy[ODP_FLOW_ATTR_MAX + 1] = {
 844         [ODP_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 845         [ODP_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 846         [ODP_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 847 };
 848
 849 static struct genl_family dp_flow_genl_family = {
 850         .id = GENL_ID_GENERATE,
 851         .hdrsize = sizeof(struct odp_header),
 852         .name = ODP_FLOW_FAMILY,
 853         .version = 1,
 854         .maxattr = ODP_FLOW_ATTR_MAX
 855 };
 856
 857 static struct genl_multicast_group dp_flow_multicast_group = {
 858         .name = ODP_FLOW_MCGROUP
 859 };
 860
 861 /* Called with genl_lock. */
 862 static int odp_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 863                                   struct sk_buff *skb, u32 pid, u32 seq, u32 flags, u8 cmd)
 864 {
 865         const int skb_orig_len = skb->len;
 866         const struct sw_flow_actions *sf_acts;
 867         struct odp_flow_stats stats;
 868         struct odp_header *odp_header;
 869         struct nlattr *nla;
 870         unsigned long used;
 871         u8 tcp_flags;
 872         int err;
 873
 874         sf_acts = rcu_dereference_protected(flow->sf_acts,
 875                                             lockdep_genl_is_held());
 876
 877         odp_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
 878         if (!odp_header)
 879                 return -EMSGSIZE;
 880
 881         odp_header->dp_ifindex = dp->dp_ifindex;
 882
 883         nla = nla_nest_start(skb, ODP_FLOW_ATTR_KEY);
 884         if (!nla)
 885                 goto nla_put_failure;
 886         err = flow_to_nlattrs(&flow->key, skb);
 887         if (err)
 888                 goto error;
 889         nla_nest_end(skb, nla);
 890
 891         spin_lock_bh(&flow->lock);
 892         used = flow->used;
 893         stats.n_packets = flow->packet_count;
 894         stats.n_bytes = flow->byte_count;
 895         tcp_flags = flow->tcp_flags;
 896         spin_unlock_bh(&flow->lock);
 897
 898         if (used)
 899                 NLA_PUT_U64(skb, ODP_FLOW_ATTR_USED, flow_used_time(used));
 900
 901         if (stats.n_packets)
 902                 NLA_PUT(skb, ODP_FLOW_ATTR_STATS, sizeof(struct odp_flow_stats), &stats);
 903
 904         if (tcp_flags)
 905                 NLA_PUT_U8(skb, ODP_FLOW_ATTR_TCP_FLAGS, tcp_flags);
 906
 907         /* If ODP_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 908          * this is the first flow to be dumped into 'skb'.  This is unusual for
 909          * Netlink but individual action lists can be longer than
 910          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 911          * The userspace caller can always fetch the actions separately if it
 912          * really wants them.  (Most userspace callers in fact don't care.)
 913          *
 914          * This can only fail for dump operations because the skb is always
 915          * properly sized for single flows.
 916          */
 917         err = nla_put(skb, ODP_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 918                       sf_acts->actions);
 919         if (err < 0 && skb_orig_len)
 920                 goto error;
 921
 922         return genlmsg_end(skb, odp_header);
 923
 924 nla_put_failure:
 925         err = -EMSGSIZE;
 926 error:
 927         genlmsg_cancel(skb, odp_header);
 928         return err;
 929 }
 930
 931 static struct sk_buff *odp_flow_cmd_alloc_info(struct sw_flow *flow)
 932 {
 933         const struct sw_flow_actions *sf_acts;
 934         int len;
 935
 936         sf_acts = rcu_dereference_protected(flow->sf_acts,
 937                                             lockdep_genl_is_held());
 938
 939         len = nla_total_size(FLOW_BUFSIZE); /* ODP_FLOW_ATTR_KEY */
 940         len += nla_total_size(sf_acts->actions_len); /* ODP_FLOW_ATTR_ACTIONS */
 941         len += nla_total_size(sizeof(struct odp_flow_stats)); /* ODP_FLOW_ATTR_STATS */
 942         len += nla_total_size(1); /* ODP_FLOW_ATTR_TCP_FLAGS */
 943         len += nla_total_size(8); /* ODP_FLOW_ATTR_USED */
 944         return genlmsg_new(NLMSG_ALIGN(sizeof(struct odp_header)) + len, GFP_KERNEL);
 945 }
 946
 947 static struct sk_buff *odp_flow_cmd_build_info(struct sw_flow *flow, struct datapath *dp,
 948                                                u32 pid, u32 seq, u8 cmd)
 949 {
 950         struct sk_buff *skb;
 951         int retval;
 952
 953         skb = odp_flow_cmd_alloc_info(flow);
 954         if (!skb)
 955                 return ERR_PTR(-ENOMEM);
 956
 957         retval = odp_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
 958         BUG_ON(retval < 0);
 959         return skb;
 960 }
 961
 962 static int odp_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 963 {
 964         struct nlattr **a = info->attrs;
 965         struct odp_header *odp_header = info->userhdr;
 966         struct tbl_node *flow_node;
 967         struct sw_flow_key key;
 968         struct sw_flow *flow;
 969         struct sk_buff *reply;
 970         struct datapath *dp;
 971         struct tbl *table;
 972         u32 hash;
 973         int error;
 974
 975         /* Extract key. */
 976         error = -EINVAL;
 977         if (!a[ODP_FLOW_ATTR_KEY])
 978                 goto error;
 979         error = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
 980         if (error)
 981                 goto error;
 982
 983         /* Validate actions. */
 984         if (a[ODP_FLOW_ATTR_ACTIONS]) {
 985                 error = validate_actions(a[ODP_FLOW_ATTR_ACTIONS]);
 986                 if (error)
 987                         goto error;
 988         } else if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW) {
 989                 error = -EINVAL;
 990                 goto error;
 991         }
 992
 993         dp = get_dp(odp_header->dp_ifindex);
 994         error = -ENODEV;
 995         if (!dp)
 996                 goto error;
 997
 998         hash = flow_hash(&key);
 999         table = get_table_protected(dp);
1000         flow_node = tbl_lookup(table, &key, hash, flow_cmp);
1001         if (!flow_node) {
1002                 struct sw_flow_actions *acts;
1003
1004                 /* Bail out if we're not allowed to create a new flow. */
1005                 error = -ENOENT;
1006                 if (info->genlhdr->cmd == ODP_FLOW_CMD_SET)
1007                         goto error;
1008
1009                 /* Expand table, if necessary, to make room. */
1010                 if (tbl_count(table) >= tbl_n_buckets(table)) {
1011                         error = expand_table(dp);
1012                         if (error)
1013                                 goto error;
1014                         table = get_table_protected(dp);
1015                 }
1016
1017                 /* Allocate flow. */
1018                 flow = flow_alloc();
1019                 if (IS_ERR(flow)) {
1020                         error = PTR_ERR(flow);
1021                         goto error;
1022                 }
1023                 flow->key = key;
1024                 clear_stats(flow);
1025
1026                 /* Obtain actions. */
1027                 acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
1028                 error = PTR_ERR(acts);
1029                 if (IS_ERR(acts))
1030                         goto error_free_flow;
1031                 rcu_assign_pointer(flow->sf_acts, acts);
1032
1033                 /* Put flow in bucket. */
1034                 error = tbl_insert(table, &flow->tbl_node, hash);
1035                 if (error)
1036                         goto error_free_flow;
1037
1038                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1039                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1040         } else {
1041                 /* We found a matching flow. */
1042                 struct sw_flow_actions *old_acts;
1043
1044                 /* Bail out if we're not allowed to modify an existing flow.
1045                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1046                  * because Generic Netlink treats the latter as a dump
1047                  * request.  We also accept NLM_F_EXCL in case that bug ever
1048                  * gets fixed.
1049                  */
1050                 error = -EEXIST;
1051                 if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW &&
1052                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1053                         goto error;
1054
1055                 /* Update actions. */
1056                 flow = flow_cast(flow_node);
1057                 old_acts = rcu_dereference_protected(flow->sf_acts,
1058                                                      lockdep_genl_is_held());
1059                 if (a[ODP_FLOW_ATTR_ACTIONS] &&
1060                     (old_acts->actions_len != nla_len(a[ODP_FLOW_ATTR_ACTIONS]) ||
1061                      memcmp(old_acts->actions, nla_data(a[ODP_FLOW_ATTR_ACTIONS]),
1062                             old_acts->actions_len))) {
1063                         struct sw_flow_actions *new_acts;
1064
1065                         new_acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
1066                         error = PTR_ERR(new_acts);
1067                         if (IS_ERR(new_acts))
1068                                 goto error;
1069
1070                         rcu_assign_pointer(flow->sf_acts, new_acts);
1071                         flow_deferred_free_acts(old_acts);
1072                 }
1073
1074                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1075                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1076
1077                 /* Clear stats. */
1078                 if (a[ODP_FLOW_ATTR_CLEAR]) {
1079                         spin_lock_bh(&flow->lock);
1080                         clear_stats(flow);
1081                         spin_unlock_bh(&flow->lock);
1082                 }
1083         }
1084
1085         if (!IS_ERR(reply))
1086                 genl_notify(reply, genl_info_net(info), info->snd_pid,
1087                             dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1088         else
1089                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1090                                 dp_flow_multicast_group.id, PTR_ERR(reply));
1091         return 0;
1092
1093 error_free_flow:
1094         flow_put(flow);
1095 error:
1096         return error;
1097 }
1098
1099 static int odp_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1100 {
1101         struct nlattr **a = info->attrs;
1102         struct odp_header *odp_header = info->userhdr;
1103         struct sw_flow_key key;
1104         struct tbl_node *flow_node;
1105         struct sk_buff *reply;
1106         struct sw_flow *flow;
1107         struct datapath *dp;
1108         struct tbl *table;
1109         int err;
1110
1111         if (!a[ODP_FLOW_ATTR_KEY])
1112                 return -EINVAL;
1113         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1114         if (err)
1115                 return err;
1116
1117         dp = get_dp(odp_header->dp_ifindex);
1118         if (!dp)
1119                 return -ENODEV;
1120
1121         table = get_table_protected(dp);
1122         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1123         if (!flow_node)
1124                 return -ENOENT;
1125
1126         flow = flow_cast(flow_node);
1127         reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid, info->snd_seq, ODP_FLOW_CMD_NEW);
1128         if (IS_ERR(reply))
1129                 return PTR_ERR(reply);
1130
1131         return genlmsg_reply(reply, info);
1132 }
1133
1134 static int odp_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1135 {
1136         struct nlattr **a = info->attrs;
1137         struct odp_header *odp_header = info->userhdr;
1138         struct sw_flow_key key;
1139         struct tbl_node *flow_node;
1140         struct sk_buff *reply;
1141         struct sw_flow *flow;
1142         struct datapath *dp;
1143         struct tbl *table;
1144         int err;
1145
1146         if (!a[ODP_FLOW_ATTR_KEY])
1147                 return flush_flows(odp_header->dp_ifindex);
1148         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1149         if (err)
1150                 return err;
1151
1152         dp = get_dp(odp_header->dp_ifindex);
1153         if (!dp)
1154                 return -ENODEV;
1155
1156         table = get_table_protected(dp);
1157         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1158         if (!flow_node)
1159                 return -ENOENT;
1160         flow = flow_cast(flow_node);
1161
1162         reply = odp_flow_cmd_alloc_info(flow);
1163         if (!reply)
1164                 return -ENOMEM;
1165
1166         err = tbl_remove(table, flow_node);
1167         if (err) {
1168                 kfree_skb(reply);
1169                 return err;
1170         }
1171
1172         err = odp_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1173                                      info->snd_seq, 0, ODP_FLOW_CMD_DEL);
1174         BUG_ON(err < 0);
1175
1176         flow_deferred_free(flow);
1177
1178         genl_notify(reply, genl_info_net(info), info->snd_pid,
1179                     dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1180         return 0;
1181 }
1182
1183 static int odp_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1184 {
1185         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1186         struct datapath *dp;
1187
1188         dp = get_dp(odp_header->dp_ifindex);
1189         if (!dp)
1190                 return -ENODEV;
1191
1192         for (;;) {
1193                 struct tbl_node *flow_node;
1194                 struct sw_flow *flow;
1195                 u32 bucket, obj;
1196
1197                 bucket = cb->args[0];
1198                 obj = cb->args[1];
1199                 flow_node = tbl_next(get_table_protected(dp), &bucket, &obj);
1200                 if (!flow_node)
1201                         break;
1202
1203                 flow = flow_cast(flow_node);
1204                 if (odp_flow_cmd_fill_info(flow, dp, skb, NETLINK_CB(cb->skb).pid,
1205                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1206                                            ODP_FLOW_CMD_NEW) < 0)
1207                         break;
1208
1209                 cb->args[0] = bucket;
1210                 cb->args[1] = obj;
1211         }
1212         return skb->len;
1213 }
1214
1215 static struct genl_ops dp_flow_genl_ops[] = {
1216         { .cmd = ODP_FLOW_CMD_NEW,
1217           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1218           .policy = flow_policy,
1219           .doit = odp_flow_cmd_new_or_set
1220         },
1221         { .cmd = ODP_FLOW_CMD_DEL,
1222           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1223           .policy = flow_policy,
1224           .doit = odp_flow_cmd_del
1225         },
1226         { .cmd = ODP_FLOW_CMD_GET,
1227           .flags = 0,               /* OK for unprivileged users. */
1228           .policy = flow_policy,
1229           .doit = odp_flow_cmd_get,
1230           .dumpit = odp_flow_cmd_dump
1231         },
1232         { .cmd = ODP_FLOW_CMD_SET,
1233           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1234           .policy = flow_policy,
1235           .doit = odp_flow_cmd_new_or_set,
1236         },
1237 };
1238
1239 static const struct nla_policy datapath_policy[ODP_DP_ATTR_MAX + 1] = {
1240 #ifdef HAVE_NLA_NUL_STRING
1241         [ODP_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1242 #endif
1243         [ODP_DP_ATTR_IPV4_FRAGS] = { .type = NLA_U32 },
1244         [ODP_DP_ATTR_SAMPLING] = { .type = NLA_U32 },
1245 };
1246
1247 static struct genl_family dp_datapath_genl_family = {
1248         .id = GENL_ID_GENERATE,
1249         .hdrsize = sizeof(struct odp_header),
1250         .name = ODP_DATAPATH_FAMILY,
1251         .version = 1,
1252         .maxattr = ODP_DP_ATTR_MAX
1253 };
1254
1255 static struct genl_multicast_group dp_datapath_multicast_group = {
1256         .name = ODP_DATAPATH_MCGROUP
1257 };
1258
1259 static int odp_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1260                                 u32 pid, u32 seq, u32 flags, u8 cmd)
1261 {
1262         struct odp_header *odp_header;
1263         struct nlattr *nla;
1264         int err;
1265
1266         odp_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1267                                    flags, cmd);
1268         if (!odp_header)
1269                 goto error;
1270
1271         odp_header->dp_ifindex = dp->dp_ifindex;
1272
1273         rcu_read_lock();
1274         err = nla_put_string(skb, ODP_DP_ATTR_NAME, dp_name(dp));
1275         rcu_read_unlock();
1276         if (err)
1277                 goto nla_put_failure;
1278
1279         nla = nla_reserve(skb, ODP_DP_ATTR_STATS, sizeof(struct odp_stats));
1280         if (!nla)
1281                 goto nla_put_failure;
1282         get_dp_stats(dp, nla_data(nla));
1283
1284         NLA_PUT_U32(skb, ODP_DP_ATTR_IPV4_FRAGS,
1285                     dp->drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO);
1286
1287         if (dp->sflow_probability)
1288                 NLA_PUT_U32(skb, ODP_DP_ATTR_SAMPLING, dp->sflow_probability);
1289
1290         nla = nla_nest_start(skb, ODP_DP_ATTR_MCGROUPS);
1291         if (!nla)
1292                 goto nla_put_failure;
1293         NLA_PUT_U32(skb, ODP_PACKET_CMD_MISS, packet_mc_group(dp, ODP_PACKET_CMD_MISS));
1294         NLA_PUT_U32(skb, ODP_PACKET_CMD_ACTION, packet_mc_group(dp, ODP_PACKET_CMD_ACTION));
1295         NLA_PUT_U32(skb, ODP_PACKET_CMD_SAMPLE, packet_mc_group(dp, ODP_PACKET_CMD_SAMPLE));
1296         nla_nest_end(skb, nla);
1297
1298         return genlmsg_end(skb, odp_header);
1299
1300 nla_put_failure:
1301         genlmsg_cancel(skb, odp_header);
1302 error:
1303         return -EMSGSIZE;
1304 }
1305
1306 static struct sk_buff *odp_dp_cmd_build_info(struct datapath *dp, u32 pid,
1307                                              u32 seq, u8 cmd)
1308 {
1309         struct sk_buff *skb;
1310         int retval;
1311
1312         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1313         if (!skb)
1314                 return ERR_PTR(-ENOMEM);
1315
1316         retval = odp_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1317         if (retval < 0) {
1318                 kfree_skb(skb);
1319                 return ERR_PTR(retval);
1320         }
1321         return skb;
1322 }
1323
1324 static int odp_dp_cmd_validate(struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1325 {
1326         if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
1327                 u32 frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
1328
1329                 if (frags != ODP_DP_FRAG_ZERO && frags != ODP_DP_FRAG_DROP)
1330                         return -EINVAL;
1331         }
1332
1333         return CHECK_NUL_STRING(a[ODP_DP_ATTR_NAME], IFNAMSIZ - 1);
1334 }
1335
1336 /* Called with genl_mutex and optionally with RTNL lock also. */
1337 static struct datapath *lookup_datapath(struct odp_header *odp_header, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1338 {
1339         struct datapath *dp;
1340
1341         if (!a[ODP_DP_ATTR_NAME])
1342                 dp = get_dp(odp_header->dp_ifindex);
1343         else {
1344                 struct vport *vport;
1345
1346                 rcu_read_lock();
1347                 vport = vport_locate(nla_data(a[ODP_DP_ATTR_NAME]));
1348                 dp = vport && vport->port_no == ODPP_LOCAL ? vport->dp : NULL;
1349                 rcu_read_unlock();
1350         }
1351         return dp ? dp : ERR_PTR(-ENODEV);
1352 }
1353
1354 /* Called with genl_mutex. */
1355 static void change_datapath(struct datapath *dp, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1356 {
1357         if (a[ODP_DP_ATTR_IPV4_FRAGS])
1358                 dp->drop_frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]) == ODP_DP_FRAG_DROP;
1359         if (a[ODP_DP_ATTR_SAMPLING])
1360                 dp->sflow_probability = nla_get_u32(a[ODP_DP_ATTR_SAMPLING]);
1361 }
1362
1363 static int odp_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1364 {
1365         struct nlattr **a = info->attrs;
1366         struct vport_parms parms;
1367         struct sk_buff *reply;
1368         struct datapath *dp;
1369         struct vport *vport;
1370         int err;
1371
1372         err = -EINVAL;
1373         if (!a[ODP_DP_ATTR_NAME])
1374                 goto err;
1375
1376         err = odp_dp_cmd_validate(a);
1377         if (err)
1378                 goto err;
1379
1380         rtnl_lock();
1381         err = -ENODEV;
1382         if (!try_module_get(THIS_MODULE))
1383                 goto err_unlock_rtnl;
1384
1385         err = -ENOMEM;
1386         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1387         if (dp == NULL)
1388                 goto err_put_module;
1389         INIT_LIST_HEAD(&dp->port_list);
1390
1391         /* Initialize kobject for bridge.  This will be added as
1392          * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1393         dp->ifobj.kset = NULL;
1394         kobject_init(&dp->ifobj, &dp_ktype);
1395
1396         /* Allocate table. */
1397         err = -ENOMEM;
1398         rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
1399         if (!dp->table)
1400                 goto err_free_dp;
1401
1402         /* Set up our datapath device. */
1403         parms.name = nla_data(a[ODP_DP_ATTR_NAME]);
1404         parms.type = ODP_VPORT_TYPE_INTERNAL;
1405         parms.options = NULL;
1406         parms.dp = dp;
1407         parms.port_no = ODPP_LOCAL;
1408         vport = new_vport(&parms);
1409         if (IS_ERR(vport)) {
1410                 err = PTR_ERR(vport);
1411                 if (err == -EBUSY)
1412                         err = -EEXIST;
1413
1414                 goto err_destroy_table;
1415         }
1416         dp->dp_ifindex = vport_get_ifindex(vport);
1417
1418         dp->drop_frags = 0;
1419         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1420         if (!dp->stats_percpu) {
1421                 err = -ENOMEM;
1422                 goto err_destroy_local_port;
1423         }
1424
1425         change_datapath(dp, a);
1426
1427         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1428         err = PTR_ERR(reply);
1429         if (IS_ERR(reply))
1430                 goto err_destroy_local_port;
1431
1432         list_add_tail(&dp->list_node, &dps);
1433         dp_sysfs_add_dp(dp);
1434
1435         rtnl_unlock();
1436
1437         genl_notify(reply, genl_info_net(info), info->snd_pid,
1438                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1439         return 0;
1440
1441 err_destroy_local_port:
1442         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1443 err_destroy_table:
1444         tbl_destroy(get_table_protected(dp), NULL);
1445 err_free_dp:
1446         kfree(dp);
1447 err_put_module:
1448         module_put(THIS_MODULE);
1449 err_unlock_rtnl:
1450         rtnl_unlock();
1451 err:
1452         return err;
1453 }
1454
1455 static int odp_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1456 {
1457         struct vport *vport, *next_vport;
1458         struct sk_buff *reply;
1459         struct datapath *dp;
1460         int err;
1461
1462         err = odp_dp_cmd_validate(info->attrs);
1463         if (err)
1464                 goto exit;
1465
1466         rtnl_lock();
1467         dp = lookup_datapath(info->userhdr, info->attrs);
1468         err = PTR_ERR(dp);
1469         if (IS_ERR(dp))
1470                 goto exit_unlock;
1471
1472         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_DEL);
1473         err = PTR_ERR(reply);
1474         if (IS_ERR(reply))
1475                 goto exit_unlock;
1476
1477         list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
1478                 if (vport->port_no != ODPP_LOCAL)
1479                         dp_detach_port(vport);
1480
1481         dp_sysfs_del_dp(dp);
1482         list_del(&dp->list_node);
1483         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1484
1485         /* rtnl_unlock() will wait until all the references to devices that
1486          * are pending unregistration have been dropped.  We do it here to
1487          * ensure that any internal devices (which contain DP pointers) are
1488          * fully destroyed before freeing the datapath.
1489          */
1490         rtnl_unlock();
1491
1492         call_rcu(&dp->rcu, destroy_dp_rcu);
1493         module_put(THIS_MODULE);
1494
1495         genl_notify(reply, genl_info_net(info), info->snd_pid,
1496                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1497
1498         return 0;
1499
1500 exit_unlock:
1501         rtnl_unlock();
1502 exit:
1503         return err;
1504 }
1505
1506 static int odp_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1507 {
1508         struct sk_buff *reply;
1509         struct datapath *dp;
1510         int err;
1511
1512         err = odp_dp_cmd_validate(info->attrs);
1513         if (err)
1514                 return err;
1515
1516         dp = lookup_datapath(info->userhdr, info->attrs);
1517         if (IS_ERR(dp))
1518                 return PTR_ERR(dp);
1519
1520         change_datapath(dp, info->attrs);
1521
1522         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1523         if (IS_ERR(reply)) {
1524                 err = PTR_ERR(reply);
1525                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1526                                 dp_datapath_multicast_group.id, err);
1527                 return 0;
1528         }
1529
1530         genl_notify(reply, genl_info_net(info), info->snd_pid,
1531                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1532         return 0;
1533 }
1534
1535 static int odp_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1536 {
1537         struct sk_buff *reply;
1538         struct datapath *dp;
1539         int err;
1540
1541         err = odp_dp_cmd_validate(info->attrs);
1542         if (err)
1543                 return err;
1544
1545         dp = lookup_datapath(info->userhdr, info->attrs);
1546         if (IS_ERR(dp))
1547                 return PTR_ERR(dp);
1548
1549         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1550         if (IS_ERR(reply))
1551                 return PTR_ERR(reply);
1552
1553         return genlmsg_reply(reply, info);
1554 }
1555
1556 static int odp_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1557 {
1558         struct datapath *dp;
1559         int skip = cb->args[0];
1560         int i = 0;
1561
1562         list_for_each_entry (dp, &dps, list_node) {
1563                 if (i < skip)
1564                         continue;
1565                 if (odp_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1566                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1567                                          ODP_DP_CMD_NEW) < 0)
1568                         break;
1569                 i++;
1570         }
1571
1572         cb->args[0] = i;
1573
1574         return skb->len;
1575 }
1576
1577 static struct genl_ops dp_datapath_genl_ops[] = {
1578         { .cmd = ODP_DP_CMD_NEW,
1579           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1580           .policy = datapath_policy,
1581           .doit = odp_dp_cmd_new
1582         },
1583         { .cmd = ODP_DP_CMD_DEL,
1584           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1585           .policy = datapath_policy,
1586           .doit = odp_dp_cmd_del
1587         },
1588         { .cmd = ODP_DP_CMD_GET,
1589           .flags = 0,               /* OK for unprivileged users. */
1590           .policy = datapath_policy,
1591           .doit = odp_dp_cmd_get,
1592           .dumpit = odp_dp_cmd_dump
1593         },
1594         { .cmd = ODP_DP_CMD_SET,
1595           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1596           .policy = datapath_policy,
1597           .doit = odp_dp_cmd_set,
1598         },
1599 };
1600
1601 static const struct nla_policy vport_policy[ODP_VPORT_ATTR_MAX + 1] = {
1602 #ifdef HAVE_NLA_NUL_STRING
1603         [ODP_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1604         [ODP_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1605         [ODP_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1606         [ODP_VPORT_ATTR_STATS] = { .len = sizeof(struct rtnl_link_stats64) },
1607         [ODP_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1608 #else
1609         [ODP_VPORT_ATTR_STATS] = { .minlen = sizeof(struct rtnl_link_stats64) },
1610         [ODP_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1611 #endif
1612         [ODP_VPORT_ATTR_MTU] = { .type = NLA_U32 },
1613         [ODP_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1614 };
1615
1616 static struct genl_family dp_vport_genl_family = {
1617         .id = GENL_ID_GENERATE,
1618         .hdrsize = sizeof(struct odp_header),
1619         .name = ODP_VPORT_FAMILY,
1620         .version = 1,
1621         .maxattr = ODP_VPORT_ATTR_MAX
1622 };
1623
1624 static struct genl_multicast_group dp_vport_multicast_group = {
1625         .name = ODP_VPORT_MCGROUP
1626 };
1627
1628 /* Called with RTNL lock or RCU read lock. */
1629 static int odp_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1630                                    u32 pid, u32 seq, u32 flags, u8 cmd)
1631 {
1632         struct odp_header *odp_header;
1633         struct nlattr *nla;
1634         int ifindex, iflink;
1635         int mtu;
1636         int err;
1637
1638         odp_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1639                                  flags, cmd);
1640         if (!odp_header)
1641                 return -EMSGSIZE;
1642
1643         odp_header->dp_ifindex = vport->dp->dp_ifindex;
1644
1645         NLA_PUT_U32(skb, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
1646         NLA_PUT_U32(skb, ODP_VPORT_ATTR_TYPE, vport_get_type(vport));
1647         NLA_PUT_STRING(skb, ODP_VPORT_ATTR_NAME, vport_get_name(vport));
1648
1649         nla = nla_reserve(skb, ODP_VPORT_ATTR_STATS, sizeof(struct rtnl_link_stats64));
1650         if (!nla)
1651                 goto nla_put_failure;
1652         if (vport_get_stats(vport, nla_data(nla)))
1653                 __skb_trim(skb, skb->len - nla->nla_len);
1654
1655         NLA_PUT(skb, ODP_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
1656
1657         mtu = vport_get_mtu(vport);
1658         if (mtu)
1659                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_MTU, mtu);
1660
1661         err = vport_get_options(vport, skb);
1662         if (err == -EMSGSIZE)
1663                 goto error;
1664
1665         ifindex = vport_get_ifindex(vport);
1666         if (ifindex > 0)
1667                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFINDEX, ifindex);
1668
1669         iflink = vport_get_iflink(vport);
1670         if (iflink > 0)
1671                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFLINK, iflink);
1672
1673         return genlmsg_end(skb, odp_header);
1674
1675 nla_put_failure:
1676         err = -EMSGSIZE;
1677 error:
1678         genlmsg_cancel(skb, odp_header);
1679         return err;
1680 }
1681
1682 /* Called with RTNL lock or RCU read lock. */
1683 static struct sk_buff *odp_vport_cmd_build_info(struct vport *vport, u32 pid,
1684                                                 u32 seq, u8 cmd)
1685 {
1686         struct sk_buff *skb;
1687         int retval;
1688
1689         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1690         if (!skb)
1691                 return ERR_PTR(-ENOMEM);
1692
1693         retval = odp_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1694         if (retval < 0) {
1695                 kfree_skb(skb);
1696                 return ERR_PTR(retval);
1697         }
1698         return skb;
1699 }
1700
1701 static int odp_vport_cmd_validate(struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1702 {
1703         return CHECK_NUL_STRING(a[ODP_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1704 }
1705
1706 /* Called with RTNL lock or RCU read lock. */
1707 static struct vport *lookup_vport(struct odp_header *odp_header,
1708                                   struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1709 {
1710         struct datapath *dp;
1711         struct vport *vport;
1712
1713         if (a[ODP_VPORT_ATTR_NAME]) {
1714                 vport = vport_locate(nla_data(a[ODP_VPORT_ATTR_NAME]));
1715                 if (!vport)
1716                         return ERR_PTR(-ENODEV);
1717                 return vport;
1718         } else if (a[ODP_VPORT_ATTR_PORT_NO]) {
1719                 u32 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1720
1721                 if (port_no >= DP_MAX_PORTS)
1722                         return ERR_PTR(-EFBIG);
1723
1724                 dp = get_dp(odp_header->dp_ifindex);
1725                 if (!dp)
1726                         return ERR_PTR(-ENODEV);
1727
1728                 vport = get_vport_protected(dp, port_no);
1729                 if (!vport)
1730                         return ERR_PTR(-ENOENT);
1731                 return vport;
1732         } else
1733                 return ERR_PTR(-EINVAL);
1734 }
1735
1736 /* Called with RTNL lock. */
1737 static int change_vport(struct vport *vport, struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1738 {
1739         int err = 0;
1740         if (a[ODP_VPORT_ATTR_STATS])
1741                 err = vport_set_stats(vport, nla_data(a[ODP_VPORT_ATTR_STATS]));
1742         if (!err && a[ODP_VPORT_ATTR_ADDRESS])
1743                 err = vport_set_addr(vport, nla_data(a[ODP_VPORT_ATTR_ADDRESS]));
1744         if (!err && a[ODP_VPORT_ATTR_MTU])
1745                 err = vport_set_mtu(vport, nla_get_u32(a[ODP_VPORT_ATTR_MTU]));
1746         return err;
1747 }
1748
1749 static int odp_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1750 {
1751         struct nlattr **a = info->attrs;
1752         struct odp_header *odp_header = info->userhdr;
1753         struct vport_parms parms;
1754         struct sk_buff *reply;
1755         struct vport *vport;
1756         struct datapath *dp;
1757         u32 port_no;
1758         int err;
1759
1760         err = -EINVAL;
1761         if (!a[ODP_VPORT_ATTR_NAME] || !a[ODP_VPORT_ATTR_TYPE])
1762                 goto exit;
1763
1764         err = odp_vport_cmd_validate(a);
1765         if (err)
1766                 goto exit;
1767
1768         rtnl_lock();
1769         dp = get_dp(odp_header->dp_ifindex);
1770         err = -ENODEV;
1771         if (!dp)
1772                 goto exit_unlock;
1773
1774         if (a[ODP_VPORT_ATTR_PORT_NO]) {
1775                 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1776
1777                 err = -EFBIG;
1778                 if (port_no >= DP_MAX_PORTS)
1779                         goto exit_unlock;
1780
1781                 vport = get_vport_protected(dp, port_no);
1782                 err = -EBUSY;
1783                 if (vport)
1784                         goto exit_unlock;
1785         } else {
1786                 for (port_no = 1; ; port_no++) {
1787                         if (port_no >= DP_MAX_PORTS) {
1788                                 err = -EFBIG;
1789                                 goto exit_unlock;
1790                         }
1791                         vport = get_vport_protected(dp, port_no);
1792                         if (!vport)
1793                                 break;
1794                 }
1795         }
1796
1797         parms.name = nla_data(a[ODP_VPORT_ATTR_NAME]);
1798         parms.type = nla_get_u32(a[ODP_VPORT_ATTR_TYPE]);
1799         parms.options = a[ODP_VPORT_ATTR_OPTIONS];
1800         parms.dp = dp;
1801         parms.port_no = port_no;
1802
1803         vport = new_vport(&parms);
1804         err = PTR_ERR(vport);
1805         if (IS_ERR(vport))
1806                 goto exit_unlock;
1807
1808         set_internal_devs_mtu(dp);
1809         dp_sysfs_add_if(vport);
1810
1811         err = change_vport(vport, a);
1812         if (!err) {
1813                 reply = odp_vport_cmd_build_info(vport, info->snd_pid,
1814                                                  info->snd_seq, ODP_VPORT_CMD_NEW);
1815                 if (IS_ERR(reply))
1816                         err = PTR_ERR(reply);
1817         }
1818         if (err) {
1819                 dp_detach_port(vport);
1820                 goto exit_unlock;
1821         }
1822         genl_notify(reply, genl_info_net(info), info->snd_pid,
1823                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1824
1825
1826 exit_unlock:
1827         rtnl_unlock();
1828 exit:
1829         return err;
1830 }
1831
1832 static int odp_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1833 {
1834         struct nlattr **a = info->attrs;
1835         struct sk_buff *reply;
1836         struct vport *vport;
1837         int err;
1838
1839         err = odp_vport_cmd_validate(a);
1840         if (err)
1841                 goto exit;
1842
1843         rtnl_lock();
1844         vport = lookup_vport(info->userhdr, a);
1845         err = PTR_ERR(vport);
1846         if (IS_ERR(vport))
1847                 goto exit_unlock;
1848
1849         err = 0;
1850         if (a[ODP_VPORT_ATTR_OPTIONS])
1851                 err = vport_set_options(vport, a[ODP_VPORT_ATTR_OPTIONS]);
1852         if (!err)
1853                 err = change_vport(vport, a);
1854
1855         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1856                                          ODP_VPORT_CMD_NEW);
1857         if (IS_ERR(reply)) {
1858                 err = PTR_ERR(reply);
1859                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1860                                 dp_vport_multicast_group.id, err);
1861                 return 0;
1862         }
1863
1864         genl_notify(reply, genl_info_net(info), info->snd_pid,
1865                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1866
1867 exit_unlock:
1868         rtnl_unlock();
1869 exit:
1870         return err;
1871 }
1872
1873 static int odp_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1874 {
1875         struct nlattr **a = info->attrs;
1876         struct sk_buff *reply;
1877         struct vport *vport;
1878         int err;
1879
1880         err = odp_vport_cmd_validate(a);
1881         if (err)
1882                 goto exit;
1883
1884         rtnl_lock();
1885         vport = lookup_vport(info->userhdr, a);
1886         err = PTR_ERR(vport);
1887         if (IS_ERR(vport))
1888                 goto exit_unlock;
1889
1890         if (vport->port_no == ODPP_LOCAL) {
1891                 err = -EINVAL;
1892                 goto exit_unlock;
1893         }
1894
1895         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1896                                          ODP_VPORT_CMD_DEL);
1897         err = PTR_ERR(reply);
1898         if (IS_ERR(reply))
1899                 goto exit_unlock;
1900
1901         err = dp_detach_port(vport);
1902
1903         genl_notify(reply, genl_info_net(info), info->snd_pid,
1904                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1905
1906 exit_unlock:
1907         rtnl_unlock();
1908 exit:
1909         return err;
1910 }
1911
1912 static int odp_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1913 {
1914         struct nlattr **a = info->attrs;
1915         struct odp_header *odp_header = info->userhdr;
1916         struct sk_buff *reply;
1917         struct vport *vport;
1918         int err;
1919
1920         err = odp_vport_cmd_validate(a);
1921         if (err)
1922                 goto exit;
1923
1924         rcu_read_lock();
1925         vport = lookup_vport(odp_header, a);
1926         err = PTR_ERR(vport);
1927         if (IS_ERR(vport))
1928                 goto exit_unlock;
1929
1930         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1931                                          ODP_VPORT_CMD_NEW);
1932         err = PTR_ERR(reply);
1933         if (IS_ERR(reply))
1934                 goto exit_unlock;
1935
1936         err = genlmsg_reply(reply, info);
1937
1938 exit_unlock:
1939         rcu_read_unlock();
1940 exit:
1941         return err;
1942 }
1943
1944 static int odp_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1945 {
1946         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1947         struct datapath *dp;
1948         u32 port_no;
1949         int retval;
1950
1951         dp = get_dp(odp_header->dp_ifindex);
1952         if (!dp)
1953                 return -ENODEV;
1954
1955         rcu_read_lock();
1956         for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1957                 struct vport *vport;
1958
1959                 vport = get_vport_protected(dp, port_no);
1960                 if (!vport)
1961                         continue;
1962
1963                 if (odp_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1964                                             cb->nlh->nlmsg_seq, NLM_F_MULTI,
1965                                             ODP_VPORT_CMD_NEW) < 0)
1966                         break;
1967         }
1968         rcu_read_unlock();
1969
1970         cb->args[0] = port_no;
1971         retval = skb->len;
1972
1973         return retval;
1974 }
1975
1976 static struct genl_ops dp_vport_genl_ops[] = {
1977         { .cmd = ODP_VPORT_CMD_NEW,
1978           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1979           .policy = vport_policy,
1980           .doit = odp_vport_cmd_new
1981         },
1982         { .cmd = ODP_VPORT_CMD_DEL,
1983           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1984           .policy = vport_policy,
1985           .doit = odp_vport_cmd_del
1986         },
1987         { .cmd = ODP_VPORT_CMD_GET,
1988           .flags = 0,               /* OK for unprivileged users. */
1989           .policy = vport_policy,
1990           .doit = odp_vport_cmd_get,
1991           .dumpit = odp_vport_cmd_dump
1992         },
1993         { .cmd = ODP_VPORT_CMD_SET,
1994           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1995           .policy = vport_policy,
1996           .doit = odp_vport_cmd_set,
1997         },
1998 };
1999
2000 struct genl_family_and_ops {
2001         struct genl_family *family;
2002         struct genl_ops *ops;
2003         int n_ops;
2004         struct genl_multicast_group *group;
2005 };
2006
2007 static const struct genl_family_and_ops dp_genl_families[] = {
2008         { &dp_datapath_genl_family,
2009           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2010           &dp_datapath_multicast_group },
2011         { &dp_vport_genl_family,
2012           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2013           &dp_vport_multicast_group },
2014         { &dp_flow_genl_family,
2015           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2016           &dp_flow_multicast_group },
2017         { &dp_packet_genl_family,
2018           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2019           NULL },
2020 };
2021
2022 static void dp_unregister_genl(int n_families)
2023 {
2024         int i;
2025
2026         for (i = 0; i < n_families; i++) {
2027                 genl_unregister_family(dp_genl_families[i].family);
2028         }
2029 }
2030
2031 static int dp_register_genl(void)
2032 {
2033         int n_registered;
2034         int err;
2035         int i;
2036
2037         n_registered = 0;
2038         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2039                 const struct genl_family_and_ops *f = &dp_genl_families[i];
2040
2041                 err = genl_register_family_with_ops(f->family, f->ops,
2042                                                     f->n_ops);
2043                 if (err)
2044                         goto error;
2045                 n_registered++;
2046
2047                 if (f->group) {
2048                         err = genl_register_mc_group(f->family, f->group);
2049                         if (err)
2050                                 goto error;
2051                 }
2052         }
2053
2054         err = packet_register_mc_groups();
2055         if (err)
2056                 goto error;
2057         return 0;
2058
2059 error:
2060         dp_unregister_genl(n_registered);
2061         return err;
2062 }
2063
2064 static int __init dp_init(void)
2065 {
2066         struct sk_buff *dummy_skb;
2067         int err;
2068
2069         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2070
2071         printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2072
2073         err = flow_init();
2074         if (err)
2075                 goto error;
2076
2077         err = vport_init();
2078         if (err)
2079                 goto error_flow_exit;
2080
2081         err = register_netdevice_notifier(&dp_device_notifier);
2082         if (err)
2083                 goto error_vport_exit;
2084
2085         err = dp_register_genl();
2086         if (err < 0)
2087                 goto error_unreg_notifier;
2088
2089         return 0;
2090
2091 error_unreg_notifier:
2092         unregister_netdevice_notifier(&dp_device_notifier);
2093 error_vport_exit:
2094         vport_exit();
2095 error_flow_exit:
2096         flow_exit();
2097 error:
2098         return err;
2099 }
2100
2101 static void dp_cleanup(void)
2102 {
2103         rcu_barrier();
2104         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2105         unregister_netdevice_notifier(&dp_device_notifier);
2106         vport_exit();
2107         flow_exit();
2108 }
2109
2110 module_init(dp_init);
2111 module_exit(dp_cleanup);
2112
2113 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2114 MODULE_LICENSE("GPL");