net/openvswitch/conntrack.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 Nicira, Inc.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/openvswitch.h>
   8 #include <linux/tcp.h>
   9 #include <linux/udp.h>
  10 #include <linux/sctp.h>
  11 #include <linux/static_key.h>
  12 #include <linux/string_helpers.h>
  13 #include <net/ip.h>
  14 #include <net/genetlink.h>
  15 #include <net/netfilter/nf_conntrack_core.h>
  16 #include <net/netfilter/nf_conntrack_count.h>
  17 #include <net/netfilter/nf_conntrack_helper.h>
  18 #include <net/netfilter/nf_conntrack_labels.h>
  19 #include <net/netfilter/nf_conntrack_seqadj.h>
  20 #include <net/netfilter/nf_conntrack_timeout.h>
  21 #include <net/netfilter/nf_conntrack_zones.h>
  22 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  23 #include <net/ipv6_frag.h>
  24
  25 #if IS_ENABLED(CONFIG_NF_NAT)
  26 #include <net/netfilter/nf_nat.h>
  27 #endif
  28
  29 #include <net/netfilter/nf_conntrack_act_ct.h>
  30
  31 #include "datapath.h"
  32 #include "drop.h"
  33 #include "conntrack.h"
  34 #include "flow.h"
  35 #include "flow_netlink.h"
  36
  37 struct ovs_ct_len_tbl {
  38         int maxlen;
  39         int minlen;
  40 };
  41
  42 /* Metadata mark for masked write to conntrack mark */
  43 struct md_mark {
  44         u32 value;
  45         u32 mask;
  46 };
  47
  48 /* Metadata label for masked write to conntrack label. */
  49 struct md_labels {
  50         struct ovs_key_ct_labels value;
  51         struct ovs_key_ct_labels mask;
  52 };
  53
  54 enum ovs_ct_nat {
  55         OVS_CT_NAT = 1 << 0,     /* NAT for committed connections only. */
  56         OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
  57         OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
  58 };
  59
  60 /* Conntrack action context for execution. */
  61 struct ovs_conntrack_info {
  62         struct nf_conntrack_helper *helper;
  63         struct nf_conntrack_zone zone;
  64         struct nf_conn *ct;
  65         u8 commit : 1;
  66         u8 nat : 3;                 /* enum ovs_ct_nat */
  67         u8 force : 1;
  68         u8 have_eventmask : 1;
  69         u16 family;
  70         u32 eventmask;              /* Mask of 1 << IPCT_*. */
  71         struct md_mark mark;
  72         struct md_labels labels;
  73         char timeout[CTNL_TIMEOUT_NAME_MAX];
  74         struct nf_ct_timeout *nf_ct_timeout;
  75 #if IS_ENABLED(CONFIG_NF_NAT)
  76         struct nf_nat_range2 range;  /* Only present for SRC NAT and DST NAT. */
  77 #endif
  78 };
  79
  80 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
  81 #define OVS_CT_LIMIT_UNLIMITED  0
  82 #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
  83 #define CT_LIMIT_HASH_BUCKETS 512
  84 static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled);
  85
  86 struct ovs_ct_limit {
  87         /* Elements in ovs_ct_limit_info->limits hash table */
  88         struct hlist_node hlist_node;
  89         struct rcu_head rcu;
  90         u16 zone;
  91         u32 limit;
  92 };
  93
  94 struct ovs_ct_limit_info {
  95         u32 default_limit;
  96         struct hlist_head *limits;
  97         struct nf_conncount_data *data;
  98 };
  99
 100 static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = {
 101         [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, },
 102 };
 103 #endif
 104
 105 static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
 106
 107 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
 108
 109 static u16 key_to_nfproto(const struct sw_flow_key *key)
 110 {
 111         switch (ntohs(key->eth.type)) {
 112         case ETH_P_IP:
 113                 return NFPROTO_IPV4;
 114         case ETH_P_IPV6:
 115                 return NFPROTO_IPV6;
 116         default:
 117                 return NFPROTO_UNSPEC;
 118         }
 119 }
 120
 121 /* Map SKB connection state into the values used by flow definition. */
 122 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
 123 {
 124         u8 ct_state = OVS_CS_F_TRACKED;
 125
 126         switch (ctinfo) {
 127         case IP_CT_ESTABLISHED_REPLY:
 128         case IP_CT_RELATED_REPLY:
 129                 ct_state |= OVS_CS_F_REPLY_DIR;
 130                 break;
 131         default:
 132                 break;
 133         }
 134
 135         switch (ctinfo) {
 136         case IP_CT_ESTABLISHED:
 137         case IP_CT_ESTABLISHED_REPLY:
 138                 ct_state |= OVS_CS_F_ESTABLISHED;
 139                 break;
 140         case IP_CT_RELATED:
 141         case IP_CT_RELATED_REPLY:
 142                 ct_state |= OVS_CS_F_RELATED;
 143                 break;
 144         case IP_CT_NEW:
 145                 ct_state |= OVS_CS_F_NEW;
 146                 break;
 147         default:
 148                 break;
 149         }
 150
 151         return ct_state;
 152 }
 153
 154 static u32 ovs_ct_get_mark(const struct nf_conn *ct)
 155 {
 156 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 157         return ct ? READ_ONCE(ct->mark) : 0;
 158 #else
 159         return 0;
 160 #endif
 161 }
 162
 163 /* Guard against conntrack labels max size shrinking below 128 bits. */
 164 #if NF_CT_LABELS_MAX_SIZE < 16
 165 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
 166 #endif
 167
 168 static void ovs_ct_get_labels(const struct nf_conn *ct,
 169                               struct ovs_key_ct_labels *labels)
 170 {
 171         struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
 172
 173         if (cl)
 174                 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
 175         else
 176                 memset(labels, 0, OVS_CT_LABELS_LEN);
 177 }
 178
 179 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
 180                                         const struct nf_conntrack_tuple *orig,
 181                                         u8 icmp_proto)
 182 {
 183         key->ct_orig_proto = orig->dst.protonum;
 184         if (orig->dst.protonum == icmp_proto) {
 185                 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
 186                 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
 187         } else {
 188                 key->ct.orig_tp.src = orig->src.u.all;
 189                 key->ct.orig_tp.dst = orig->dst.u.all;
 190         }
 191 }
 192
 193 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
 194                                 const struct nf_conntrack_zone *zone,
 195                                 const struct nf_conn *ct)
 196 {
 197         key->ct_state = state;
 198         key->ct_zone = zone->id;
 199         key->ct.mark = ovs_ct_get_mark(ct);
 200         ovs_ct_get_labels(ct, &key->ct.labels);
 201
 202         if (ct) {
 203                 const struct nf_conntrack_tuple *orig;
 204
 205                 /* Use the master if we have one. */
 206                 if (ct->master)
 207                         ct = ct->master;
 208                 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
 209
 210                 /* IP version must match with the master connection. */
 211                 if (key->eth.type == htons(ETH_P_IP) &&
 212                     nf_ct_l3num(ct) == NFPROTO_IPV4) {
 213                         key->ipv4.ct_orig.src = orig->src.u3.ip;
 214                         key->ipv4.ct_orig.dst = orig->dst.u3.ip;
 215                         __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
 216                         return;
 217                 } else if (key->eth.type == htons(ETH_P_IPV6) &&
 218                            !sw_flow_key_is_nd(key) &&
 219                            nf_ct_l3num(ct) == NFPROTO_IPV6) {
 220                         key->ipv6.ct_orig.src = orig->src.u3.in6;
 221                         key->ipv6.ct_orig.dst = orig->dst.u3.in6;
 222                         __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
 223                         return;
 224                 }
 225         }
 226         /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
 227          * original direction key fields.
 228          */
 229         key->ct_orig_proto = 0;
 230 }
 231
 232 /* Update 'key' based on skb->_nfct.  If 'post_ct' is true, then OVS has
 233  * previously sent the packet to conntrack via the ct action.  If
 234  * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
 235  * initialized from the connection status.
 236  */
 237 static void ovs_ct_update_key(const struct sk_buff *skb,
 238                               const struct ovs_conntrack_info *info,
 239                               struct sw_flow_key *key, bool post_ct,
 240                               bool keep_nat_flags)
 241 {
 242         const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
 243         enum ip_conntrack_info ctinfo;
 244         struct nf_conn *ct;
 245         u8 state = 0;
 246
 247         ct = nf_ct_get(skb, &ctinfo);
 248         if (ct) {
 249                 state = ovs_ct_get_state(ctinfo);
 250                 /* All unconfirmed entries are NEW connections. */
 251                 if (!nf_ct_is_confirmed(ct))
 252                         state |= OVS_CS_F_NEW;
 253                 /* OVS persists the related flag for the duration of the
 254                  * connection.
 255                  */
 256                 if (ct->master)
 257                         state |= OVS_CS_F_RELATED;
 258                 if (keep_nat_flags) {
 259                         state |= key->ct_state & OVS_CS_F_NAT_MASK;
 260                 } else {
 261                         if (ct->status & IPS_SRC_NAT)
 262                                 state |= OVS_CS_F_SRC_NAT;
 263                         if (ct->status & IPS_DST_NAT)
 264                                 state |= OVS_CS_F_DST_NAT;
 265                 }
 266                 zone = nf_ct_zone(ct);
 267         } else if (post_ct) {
 268                 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
 269                 if (info)
 270                         zone = &info->zone;
 271         }
 272         __ovs_ct_update_key(key, state, zone, ct);
 273 }
 274
 275 /* This is called to initialize CT key fields possibly coming in from the local
 276  * stack.
 277  */
 278 void ovs_ct_fill_key(const struct sk_buff *skb,
 279                      struct sw_flow_key *key,
 280                      bool post_ct)
 281 {
 282         ovs_ct_update_key(skb, NULL, key, post_ct, false);
 283 }
 284
 285 int ovs_ct_put_key(const struct sw_flow_key *swkey,
 286                    const struct sw_flow_key *output, struct sk_buff *skb)
 287 {
 288         if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
 289                 return -EMSGSIZE;
 290
 291         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 292             nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
 293                 return -EMSGSIZE;
 294
 295         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
 296             nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
 297                 return -EMSGSIZE;
 298
 299         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
 300             nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
 301                     &output->ct.labels))
 302                 return -EMSGSIZE;
 303
 304         if (swkey->ct_orig_proto) {
 305                 if (swkey->eth.type == htons(ETH_P_IP)) {
 306                         struct ovs_key_ct_tuple_ipv4 orig;
 307
 308                         memset(&orig, 0, sizeof(orig));
 309                         orig.ipv4_src = output->ipv4.ct_orig.src;
 310                         orig.ipv4_dst = output->ipv4.ct_orig.dst;
 311                         orig.src_port = output->ct.orig_tp.src;
 312                         orig.dst_port = output->ct.orig_tp.dst;
 313                         orig.ipv4_proto = output->ct_orig_proto;
 314
 315                         if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
 316                                     sizeof(orig), &orig))
 317                                 return -EMSGSIZE;
 318                 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
 319                         struct ovs_key_ct_tuple_ipv6 orig;
 320
 321                         memset(&orig, 0, sizeof(orig));
 322                         memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32,
 323                                sizeof(orig.ipv6_src));
 324                         memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32,
 325                                sizeof(orig.ipv6_dst));
 326                         orig.src_port = output->ct.orig_tp.src;
 327                         orig.dst_port = output->ct.orig_tp.dst;
 328                         orig.ipv6_proto = output->ct_orig_proto;
 329
 330                         if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
 331                                     sizeof(orig), &orig))
 332                                 return -EMSGSIZE;
 333                 }
 334         }
 335
 336         return 0;
 337 }
 338
 339 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
 340                            u32 ct_mark, u32 mask)
 341 {
 342 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 343         u32 new_mark;
 344
 345         new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask));
 346         if (READ_ONCE(ct->mark) != new_mark) {
 347                 WRITE_ONCE(ct->mark, new_mark);
 348                 if (nf_ct_is_confirmed(ct))
 349                         nf_conntrack_event_cache(IPCT_MARK, ct);
 350                 key->ct.mark = new_mark;
 351         }
 352
 353         return 0;
 354 #else
 355         return -ENOTSUPP;
 356 #endif
 357 }
 358
 359 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
 360 {
 361         struct nf_conn_labels *cl;
 362
 363         cl = nf_ct_labels_find(ct);
 364         if (!cl) {
 365                 nf_ct_labels_ext_add(ct);
 366                 cl = nf_ct_labels_find(ct);
 367         }
 368
 369         return cl;
 370 }
 371
 372 /* Initialize labels for a new, yet to be committed conntrack entry.  Note that
 373  * since the new connection is not yet confirmed, and thus no-one else has
 374  * access to it's labels, we simply write them over.
 375  */
 376 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
 377                               const struct ovs_key_ct_labels *labels,
 378                               const struct ovs_key_ct_labels *mask)
 379 {
 380         struct nf_conn_labels *cl, *master_cl;
 381         bool have_mask = labels_nonzero(mask);
 382
 383         /* Inherit master's labels to the related connection? */
 384         master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
 385
 386         if (!master_cl && !have_mask)
 387                 return 0;   /* Nothing to do. */
 388
 389         cl = ovs_ct_get_conn_labels(ct);
 390         if (!cl)
 391                 return -ENOSPC;
 392
 393         /* Inherit the master's labels, if any. */
 394         if (master_cl)
 395                 *cl = *master_cl;
 396
 397         if (have_mask) {
 398                 u32 *dst = (u32 *)cl->bits;
 399                 int i;
 400
 401                 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
 402                         dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
 403                                 (labels->ct_labels_32[i]
 404                                  & mask->ct_labels_32[i]);
 405         }
 406
 407         /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
 408          * IPCT_LABEL bit is set in the event cache.
 409          */
 410         nf_conntrack_event_cache(IPCT_LABEL, ct);
 411
 412         memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
 413
 414         return 0;
 415 }
 416
 417 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
 418                              const struct ovs_key_ct_labels *labels,
 419                              const struct ovs_key_ct_labels *mask)
 420 {
 421         struct nf_conn_labels *cl;
 422         int err;
 423
 424         cl = ovs_ct_get_conn_labels(ct);
 425         if (!cl)
 426                 return -ENOSPC;
 427
 428         err = nf_connlabels_replace(ct, labels->ct_labels_32,
 429                                     mask->ct_labels_32,
 430                                     OVS_CT_LABELS_LEN_32);
 431         if (err)
 432                 return err;
 433
 434         memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
 435
 436         return 0;
 437 }
 438
 439 static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
 440                                    u16 zone, int family, struct sk_buff *skb)
 441 {
 442         struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
 443         int err;
 444
 445         err = nf_ct_handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
 446         if (err)
 447                 return err;
 448
 449         /* The key extracted from the fragment that completed this datagram
 450          * likely didn't have an L4 header, so regenerate it.
 451          */
 452         ovs_flow_key_update_l3l4(skb, key);
 453         key->ip.frag = OVS_FRAG_TYPE_NONE;
 454         *OVS_CB(skb) = ovs_cb;
 455
 456         return 0;
 457 }
 458
 459 /* This replicates logic from nf_conntrack_core.c that is not exported. */
 460 static enum ip_conntrack_info
 461 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
 462 {
 463         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
 464
 465         if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
 466                 return IP_CT_ESTABLISHED_REPLY;
 467         /* Once we've had two way comms, always ESTABLISHED. */
 468         if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
 469                 return IP_CT_ESTABLISHED;
 470         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
 471                 return IP_CT_RELATED;
 472         return IP_CT_NEW;
 473 }
 474
 475 /* Find an existing connection which this packet belongs to without
 476  * re-attributing statistics or modifying the connection state.  This allows an
 477  * skb->_nfct lost due to an upcall to be recovered during actions execution.
 478  *
 479  * Must be called with rcu_read_lock.
 480  *
 481  * On success, populates skb->_nfct and returns the connection.  Returns NULL
 482  * if there is no existing entry.
 483  */
 484 static struct nf_conn *
 485 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
 486                      u8 l3num, struct sk_buff *skb, bool natted)
 487 {
 488         struct nf_conntrack_tuple tuple;
 489         struct nf_conntrack_tuple_hash *h;
 490         struct nf_conn *ct;
 491
 492         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
 493                                net, &tuple)) {
 494                 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
 495                 return NULL;
 496         }
 497
 498         /* Must invert the tuple if skb has been transformed by NAT. */
 499         if (natted) {
 500                 struct nf_conntrack_tuple inverse;
 501
 502                 if (!nf_ct_invert_tuple(&inverse, &tuple)) {
 503                         pr_debug("ovs_ct_find_existing: Inversion failed!\n");
 504                         return NULL;
 505                 }
 506                 tuple = inverse;
 507         }
 508
 509         /* look for tuple match */
 510         h = nf_conntrack_find_get(net, zone, &tuple);
 511         if (!h)
 512                 return NULL;   /* Not found. */
 513
 514         ct = nf_ct_tuplehash_to_ctrack(h);
 515
 516         /* Inverted packet tuple matches the reverse direction conntrack tuple,
 517          * select the other tuplehash to get the right 'ctinfo' bits for this
 518          * packet.
 519          */
 520         if (natted)
 521                 h = &ct->tuplehash[!h->tuple.dst.dir];
 522
 523         nf_ct_set(skb, ct, ovs_ct_get_info(h));
 524         return ct;
 525 }
 526
 527 static
 528 struct nf_conn *ovs_ct_executed(struct net *net,
 529                                 const struct sw_flow_key *key,
 530                                 const struct ovs_conntrack_info *info,
 531                                 struct sk_buff *skb,
 532                                 bool *ct_executed)
 533 {
 534         struct nf_conn *ct = NULL;
 535
 536         /* If no ct, check if we have evidence that an existing conntrack entry
 537          * might be found for this skb.  This happens when we lose a skb->_nfct
 538          * due to an upcall, or if the direction is being forced.  If the
 539          * connection was not confirmed, it is not cached and needs to be run
 540          * through conntrack again.
 541          */
 542         *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
 543                        !(key->ct_state & OVS_CS_F_INVALID) &&
 544                        (key->ct_zone == info->zone.id);
 545
 546         if (*ct_executed || (!key->ct_state && info->force)) {
 547                 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
 548                                           !!(key->ct_state &
 549                                           OVS_CS_F_NAT_MASK));
 550         }
 551
 552         return ct;
 553 }
 554
 555 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
 556 static bool skb_nfct_cached(struct net *net,
 557                             const struct sw_flow_key *key,
 558                             const struct ovs_conntrack_info *info,
 559                             struct sk_buff *skb)
 560 {
 561         enum ip_conntrack_info ctinfo;
 562         struct nf_conn *ct;
 563         bool ct_executed = true;
 564
 565         ct = nf_ct_get(skb, &ctinfo);
 566         if (!ct)
 567                 ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
 568
 569         if (ct)
 570                 nf_ct_get(skb, &ctinfo);
 571         else
 572                 return false;
 573
 574         if (!net_eq(net, read_pnet(&ct->ct_net)))
 575                 return false;
 576         if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
 577                 return false;
 578         if (info->helper) {
 579                 struct nf_conn_help *help;
 580
 581                 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
 582                 if (help && rcu_access_pointer(help->helper) != info->helper)
 583                         return false;
 584         }
 585         if (info->nf_ct_timeout) {
 586                 struct nf_conn_timeout *timeout_ext;
 587
 588                 timeout_ext = nf_ct_timeout_find(ct);
 589                 if (!timeout_ext || info->nf_ct_timeout !=
 590                     rcu_dereference(timeout_ext->timeout))
 591                         return false;
 592         }
 593         /* Force conntrack entry direction to the current packet? */
 594         if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
 595                 /* Delete the conntrack entry if confirmed, else just release
 596                  * the reference.
 597                  */
 598                 if (nf_ct_is_confirmed(ct))
 599                         nf_ct_delete(ct, 0, 0);
 600
 601                 nf_ct_put(ct);
 602                 nf_ct_set(skb, NULL, 0);
 603                 return false;
 604         }
 605
 606         return ct_executed;
 607 }
 608
 609 #if IS_ENABLED(CONFIG_NF_NAT)
 610 static void ovs_nat_update_key(struct sw_flow_key *key,
 611                                const struct sk_buff *skb,
 612                                enum nf_nat_manip_type maniptype)
 613 {
 614         if (maniptype == NF_NAT_MANIP_SRC) {
 615                 __be16 src;
 616
 617                 key->ct_state |= OVS_CS_F_SRC_NAT;
 618                 if (key->eth.type == htons(ETH_P_IP))
 619                         key->ipv4.addr.src = ip_hdr(skb)->saddr;
 620                 else if (key->eth.type == htons(ETH_P_IPV6))
 621                         memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
 622                                sizeof(key->ipv6.addr.src));
 623                 else
 624                         return;
 625
 626                 if (key->ip.proto == IPPROTO_UDP)
 627                         src = udp_hdr(skb)->source;
 628                 else if (key->ip.proto == IPPROTO_TCP)
 629                         src = tcp_hdr(skb)->source;
 630                 else if (key->ip.proto == IPPROTO_SCTP)
 631                         src = sctp_hdr(skb)->source;
 632                 else
 633                         return;
 634
 635                 key->tp.src = src;
 636         } else {
 637                 __be16 dst;
 638
 639                 key->ct_state |= OVS_CS_F_DST_NAT;
 640                 if (key->eth.type == htons(ETH_P_IP))
 641                         key->ipv4.addr.dst = ip_hdr(skb)->daddr;
 642                 else if (key->eth.type == htons(ETH_P_IPV6))
 643                         memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
 644                                sizeof(key->ipv6.addr.dst));
 645                 else
 646                         return;
 647
 648                 if (key->ip.proto == IPPROTO_UDP)
 649                         dst = udp_hdr(skb)->dest;
 650                 else if (key->ip.proto == IPPROTO_TCP)
 651                         dst = tcp_hdr(skb)->dest;
 652                 else if (key->ip.proto == IPPROTO_SCTP)
 653                         dst = sctp_hdr(skb)->dest;
 654                 else
 655                         return;
 656
 657                 key->tp.dst = dst;
 658         }
 659 }
 660
 661 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
 662 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
 663                       const struct ovs_conntrack_info *info,
 664                       struct sk_buff *skb, struct nf_conn *ct,
 665                       enum ip_conntrack_info ctinfo)
 666 {
 667         int err, action = 0;
 668
 669         if (!(info->nat & OVS_CT_NAT))
 670                 return NF_ACCEPT;
 671         if (info->nat & OVS_CT_SRC_NAT)
 672                 action |= BIT(NF_NAT_MANIP_SRC);
 673         if (info->nat & OVS_CT_DST_NAT)
 674                 action |= BIT(NF_NAT_MANIP_DST);
 675
 676         err = nf_ct_nat(skb, ct, ctinfo, &action, &info->range, info->commit);
 677
 678         if (action & BIT(NF_NAT_MANIP_SRC))
 679                 ovs_nat_update_key(key, skb, NF_NAT_MANIP_SRC);
 680         if (action & BIT(NF_NAT_MANIP_DST))
 681                 ovs_nat_update_key(key, skb, NF_NAT_MANIP_DST);
 682
 683         return err;
 684 }
 685 #else /* !CONFIG_NF_NAT */
 686 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
 687                       const struct ovs_conntrack_info *info,
 688                       struct sk_buff *skb, struct nf_conn *ct,
 689                       enum ip_conntrack_info ctinfo)
 690 {
 691         return NF_ACCEPT;
 692 }
 693 #endif
 694
 695 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
 696  * not done already.  Update key with new CT state after passing the packet
 697  * through conntrack.
 698  * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
 699  * set to NULL and 0 will be returned.
 700  */
 701 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 702                            const struct ovs_conntrack_info *info,
 703                            struct sk_buff *skb)
 704 {
 705         /* If we are recirculating packets to match on conntrack fields and
 706          * committing with a separate conntrack action,  then we don't need to
 707          * actually run the packet through conntrack twice unless it's for a
 708          * different zone.
 709          */
 710         bool cached = skb_nfct_cached(net, key, info, skb);
 711         enum ip_conntrack_info ctinfo;
 712         struct nf_conn *ct;
 713
 714         if (!cached) {
 715                 struct nf_hook_state state = {
 716                         .hook = NF_INET_PRE_ROUTING,
 717                         .pf = info->family,
 718                         .net = net,
 719                 };
 720                 struct nf_conn *tmpl = info->ct;
 721                 int err;
 722
 723                 /* Associate skb with specified zone. */
 724                 if (tmpl) {
 725                         ct = nf_ct_get(skb, &ctinfo);
 726                         nf_ct_put(ct);
 727                         nf_conntrack_get(&tmpl->ct_general);
 728                         nf_ct_set(skb, tmpl, IP_CT_NEW);
 729                 }
 730
 731                 err = nf_conntrack_in(skb, &state);
 732                 if (err != NF_ACCEPT)
 733                         return -ENOENT;
 734
 735                 /* Clear CT state NAT flags to mark that we have not yet done
 736                  * NAT after the nf_conntrack_in() call.  We can actually clear
 737                  * the whole state, as it will be re-initialized below.
 738                  */
 739                 key->ct_state = 0;
 740
 741                 /* Update the key, but keep the NAT flags. */
 742                 ovs_ct_update_key(skb, info, key, true, true);
 743         }
 744
 745         ct = nf_ct_get(skb, &ctinfo);
 746         if (ct) {
 747                 bool add_helper = false;
 748
 749                 /* Packets starting a new connection must be NATted before the
 750                  * helper, so that the helper knows about the NAT.  We enforce
 751                  * this by delaying both NAT and helper calls for unconfirmed
 752                  * connections until the committing CT action.  For later
 753                  * packets NAT and Helper may be called in either order.
 754                  *
 755                  * NAT will be done only if the CT action has NAT, and only
 756                  * once per packet (per zone), as guarded by the NAT bits in
 757                  * the key->ct_state.
 758                  */
 759                 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
 760                     (nf_ct_is_confirmed(ct) || info->commit) &&
 761                     ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
 762                         return -EINVAL;
 763                 }
 764
 765                 /* Userspace may decide to perform a ct lookup without a helper
 766                  * specified followed by a (recirculate and) commit with one,
 767                  * or attach a helper in a later commit.  Therefore, for
 768                  * connections which we will commit, we may need to attach
 769                  * the helper here.
 770                  */
 771                 if (!nf_ct_is_confirmed(ct) && info->commit &&
 772                     info->helper && !nfct_help(ct)) {
 773                         int err = __nf_ct_try_assign_helper(ct, info->ct,
 774                                                             GFP_ATOMIC);
 775                         if (err)
 776                                 return err;
 777                         add_helper = true;
 778
 779                         /* helper installed, add seqadj if NAT is required */
 780                         if (info->nat && !nfct_seqadj(ct)) {
 781                                 if (!nfct_seqadj_ext_add(ct))
 782                                         return -EINVAL;
 783                         }
 784                 }
 785
 786                 /* Call the helper only if:
 787                  * - nf_conntrack_in() was executed above ("!cached") or a
 788                  *   helper was just attached ("add_helper") for a confirmed
 789                  *   connection, or
 790                  * - When committing an unconfirmed connection.
 791                  */
 792                 if ((nf_ct_is_confirmed(ct) ? !cached || add_helper :
 793                                               info->commit) &&
 794                     nf_ct_helper(skb, ct, ctinfo, info->family) != NF_ACCEPT) {
 795                         return -EINVAL;
 796                 }
 797
 798                 if (nf_ct_protonum(ct) == IPPROTO_TCP &&
 799                     nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) {
 800                         /* Be liberal for tcp packets so that out-of-window
 801                          * packets are not marked invalid.
 802                          */
 803                         nf_ct_set_tcp_be_liberal(ct);
 804                 }
 805
 806                 nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
 807         }
 808
 809         return 0;
 810 }
 811
 812 /* Lookup connection and read fields into key. */
 813 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 814                          const struct ovs_conntrack_info *info,
 815                          struct sk_buff *skb)
 816 {
 817         struct nf_conn *ct;
 818         int err;
 819
 820         err = __ovs_ct_lookup(net, key, info, skb);
 821         if (err)
 822                 return err;
 823
 824         ct = (struct nf_conn *)skb_nfct(skb);
 825         if (ct)
 826                 nf_ct_deliver_cached_events(ct);
 827
 828         return 0;
 829 }
 830
 831 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
 832 {
 833         size_t i;
 834
 835         for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
 836                 if (labels->ct_labels_32[i])
 837                         return true;
 838
 839         return false;
 840 }
 841
 842 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
 843 static struct hlist_head *ct_limit_hash_bucket(
 844         const struct ovs_ct_limit_info *info, u16 zone)
 845 {
 846         return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
 847 }
 848
 849 /* Call with ovs_mutex */
 850 static void ct_limit_set(const struct ovs_ct_limit_info *info,
 851                          struct ovs_ct_limit *new_ct_limit)
 852 {
 853         struct ovs_ct_limit *ct_limit;
 854         struct hlist_head *head;
 855
 856         head = ct_limit_hash_bucket(info, new_ct_limit->zone);
 857         hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
 858                 if (ct_limit->zone == new_ct_limit->zone) {
 859                         hlist_replace_rcu(&ct_limit->hlist_node,
 860                                           &new_ct_limit->hlist_node);
 861                         kfree_rcu(ct_limit, rcu);
 862                         return;
 863                 }
 864         }
 865
 866         hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
 867 }
 868
 869 /* Call with ovs_mutex */
 870 static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
 871 {
 872         struct ovs_ct_limit *ct_limit;
 873         struct hlist_head *head;
 874         struct hlist_node *n;
 875
 876         head = ct_limit_hash_bucket(info, zone);
 877         hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
 878                 if (ct_limit->zone == zone) {
 879                         hlist_del_rcu(&ct_limit->hlist_node);
 880                         kfree_rcu(ct_limit, rcu);
 881                         return;
 882                 }
 883         }
 884 }
 885
 886 /* Call with RCU read lock */
 887 static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
 888 {
 889         struct ovs_ct_limit *ct_limit;
 890         struct hlist_head *head;
 891
 892         head = ct_limit_hash_bucket(info, zone);
 893         hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
 894                 if (ct_limit->zone == zone)
 895                         return ct_limit->limit;
 896         }
 897
 898         return info->default_limit;
 899 }
 900
 901 static int ovs_ct_check_limit(struct net *net,
 902                               const struct ovs_conntrack_info *info,
 903                               const struct nf_conntrack_tuple *tuple)
 904 {
 905         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
 906         const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
 907         u32 per_zone_limit, connections;
 908         u32 conncount_key;
 909
 910         conncount_key = info->zone.id;
 911
 912         per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
 913         if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
 914                 return 0;
 915
 916         connections = nf_conncount_count(net, ct_limit_info->data,
 917                                          &conncount_key, tuple, &info->zone);
 918         if (connections > per_zone_limit)
 919                 return -ENOMEM;
 920
 921         return 0;
 922 }
 923 #endif
 924
 925 /* Lookup connection and confirm if unconfirmed. */
 926 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
 927                          const struct ovs_conntrack_info *info,
 928                          struct sk_buff *skb)
 929 {
 930         enum ip_conntrack_info ctinfo;
 931         struct nf_conn *ct;
 932         int err;
 933
 934         err = __ovs_ct_lookup(net, key, info, skb);
 935         if (err)
 936                 return err;
 937
 938         /* The connection could be invalid, in which case this is a no-op.*/
 939         ct = nf_ct_get(skb, &ctinfo);
 940         if (!ct)
 941                 return 0;
 942
 943 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
 944         if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
 945                 if (!nf_ct_is_confirmed(ct)) {
 946                         err = ovs_ct_check_limit(net, info,
 947                                 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 948                         if (err) {
 949                                 net_warn_ratelimited("openvswitch: zone: %u "
 950                                         "exceeds conntrack limit\n",
 951                                         info->zone.id);
 952                                 return err;
 953                         }
 954                 }
 955         }
 956 #endif
 957
 958         /* Set the conntrack event mask if given.  NEW and DELETE events have
 959          * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
 960          * typically would receive many kinds of updates.  Setting the event
 961          * mask allows those events to be filtered.  The set event mask will
 962          * remain in effect for the lifetime of the connection unless changed
 963          * by a further CT action with both the commit flag and the eventmask
 964          * option. */
 965         if (info->have_eventmask) {
 966                 struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
 967
 968                 if (cache)
 969                         cache->ctmask = info->eventmask;
 970         }
 971
 972         /* Apply changes before confirming the connection so that the initial
 973          * conntrack NEW netlink event carries the values given in the CT
 974          * action.
 975          */
 976         if (info->mark.mask) {
 977                 err = ovs_ct_set_mark(ct, key, info->mark.value,
 978                                       info->mark.mask);
 979                 if (err)
 980                         return err;
 981         }
 982         if (!nf_ct_is_confirmed(ct)) {
 983                 err = ovs_ct_init_labels(ct, key, &info->labels.value,
 984                                          &info->labels.mask);
 985                 if (err)
 986                         return err;
 987
 988                 nf_conn_act_ct_ext_add(skb, ct, ctinfo);
 989         } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
 990                    labels_nonzero(&info->labels.mask)) {
 991                 err = ovs_ct_set_labels(ct, key, &info->labels.value,
 992                                         &info->labels.mask);
 993                 if (err)
 994                         return err;
 995         }
 996         /* This will take care of sending queued events even if the connection
 997          * is already confirmed.
 998          */
 999         if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1000                 return -EINVAL;
1001
1002         return 0;
1003 }
1004
1005 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1006  * value if 'skb' is freed.
1007  */
1008 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1009                    struct sw_flow_key *key,
1010                    const struct ovs_conntrack_info *info)
1011 {
1012         int nh_ofs;
1013         int err;
1014
1015         /* The conntrack module expects to be working at L3. */
1016         nh_ofs = skb_network_offset(skb);
1017         skb_pull_rcsum(skb, nh_ofs);
1018
1019         err = nf_ct_skb_network_trim(skb, info->family);
1020         if (err) {
1021                 kfree_skb(skb);
1022                 return err;
1023         }
1024
1025         if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1026                 err = ovs_ct_handle_fragments(net, key, info->zone.id,
1027                                               info->family, skb);
1028                 if (err)
1029                         return err;
1030         }
1031
1032         if (info->commit)
1033                 err = ovs_ct_commit(net, key, info, skb);
1034         else
1035                 err = ovs_ct_lookup(net, key, info, skb);
1036
1037         skb_push_rcsum(skb, nh_ofs);
1038         if (err)
1039                 ovs_kfree_skb_reason(skb, OVS_DROP_CONNTRACK);
1040         return err;
1041 }
1042
1043 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
1044 {
1045         enum ip_conntrack_info ctinfo;
1046         struct nf_conn *ct;
1047
1048         ct = nf_ct_get(skb, &ctinfo);
1049
1050         nf_ct_put(ct);
1051         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1052
1053         if (key)
1054                 ovs_ct_fill_key(skb, key, false);
1055
1056         return 0;
1057 }
1058
1059 #if IS_ENABLED(CONFIG_NF_NAT)
1060 static int parse_nat(const struct nlattr *attr,
1061                      struct ovs_conntrack_info *info, bool log)
1062 {
1063         struct nlattr *a;
1064         int rem;
1065         bool have_ip_max = false;
1066         bool have_proto_max = false;
1067         bool ip_vers = (info->family == NFPROTO_IPV6);
1068
1069         nla_for_each_nested(a, attr, rem) {
1070                 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1071                         [OVS_NAT_ATTR_SRC] = {0, 0},
1072                         [OVS_NAT_ATTR_DST] = {0, 0},
1073                         [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1074                                                  sizeof(struct in6_addr)},
1075                         [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1076                                                  sizeof(struct in6_addr)},
1077                         [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1078                         [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1079                         [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1080                         [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1081                         [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1082                 };
1083                 int type = nla_type(a);
1084
1085                 if (type > OVS_NAT_ATTR_MAX) {
1086                         OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
1087                                   type, OVS_NAT_ATTR_MAX);
1088                         return -EINVAL;
1089                 }
1090
1091                 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
1092                         OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
1093                                   type, nla_len(a),
1094                                   ovs_nat_attr_lens[type][ip_vers]);
1095                         return -EINVAL;
1096                 }
1097
1098                 switch (type) {
1099                 case OVS_NAT_ATTR_SRC:
1100                 case OVS_NAT_ATTR_DST:
1101                         if (info->nat) {
1102                                 OVS_NLERR(log, "Only one type of NAT may be specified");
1103                                 return -ERANGE;
1104                         }
1105                         info->nat |= OVS_CT_NAT;
1106                         info->nat |= ((type == OVS_NAT_ATTR_SRC)
1107                                         ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1108                         break;
1109
1110                 case OVS_NAT_ATTR_IP_MIN:
1111                         nla_memcpy(&info->range.min_addr, a,
1112                                    sizeof(info->range.min_addr));
1113                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1114                         break;
1115
1116                 case OVS_NAT_ATTR_IP_MAX:
1117                         have_ip_max = true;
1118                         nla_memcpy(&info->range.max_addr, a,
1119                                    sizeof(info->range.max_addr));
1120                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1121                         break;
1122
1123                 case OVS_NAT_ATTR_PROTO_MIN:
1124                         info->range.min_proto.all = htons(nla_get_u16(a));
1125                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1126                         break;
1127
1128                 case OVS_NAT_ATTR_PROTO_MAX:
1129                         have_proto_max = true;
1130                         info->range.max_proto.all = htons(nla_get_u16(a));
1131                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1132                         break;
1133
1134                 case OVS_NAT_ATTR_PERSISTENT:
1135                         info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1136                         break;
1137
1138                 case OVS_NAT_ATTR_PROTO_HASH:
1139                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1140                         break;
1141
1142                 case OVS_NAT_ATTR_PROTO_RANDOM:
1143                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1144                         break;
1145
1146                 default:
1147                         OVS_NLERR(log, "Unknown nat attribute (%d)", type);
1148                         return -EINVAL;
1149                 }
1150         }
1151
1152         if (rem > 0) {
1153                 OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
1154                 return -EINVAL;
1155         }
1156         if (!info->nat) {
1157                 /* Do not allow flags if no type is given. */
1158                 if (info->range.flags) {
1159                         OVS_NLERR(log,
1160                                   "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1161                                   );
1162                         return -EINVAL;
1163                 }
1164                 info->nat = OVS_CT_NAT;   /* NAT existing connections. */
1165         } else if (!info->commit) {
1166                 OVS_NLERR(log,
1167                           "NAT attributes may be specified only when CT COMMIT flag is also specified."
1168                           );
1169                 return -EINVAL;
1170         }
1171         /* Allow missing IP_MAX. */
1172         if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1173                 memcpy(&info->range.max_addr, &info->range.min_addr,
1174                        sizeof(info->range.max_addr));
1175         }
1176         /* Allow missing PROTO_MAX. */
1177         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1178             !have_proto_max) {
1179                 info->range.max_proto.all = info->range.min_proto.all;
1180         }
1181         return 0;
1182 }
1183 #endif
1184
1185 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1186         [OVS_CT_ATTR_COMMIT]    = { .minlen = 0, .maxlen = 0 },
1187         [OVS_CT_ATTR_FORCE_COMMIT]      = { .minlen = 0, .maxlen = 0 },
1188         [OVS_CT_ATTR_ZONE]      = { .minlen = sizeof(u16),
1189                                     .maxlen = sizeof(u16) },
1190         [OVS_CT_ATTR_MARK]      = { .minlen = sizeof(struct md_mark),
1191                                     .maxlen = sizeof(struct md_mark) },
1192         [OVS_CT_ATTR_LABELS]    = { .minlen = sizeof(struct md_labels),
1193                                     .maxlen = sizeof(struct md_labels) },
1194         [OVS_CT_ATTR_HELPER]    = { .minlen = 1,
1195                                     .maxlen = NF_CT_HELPER_NAME_LEN },
1196 #if IS_ENABLED(CONFIG_NF_NAT)
1197         /* NAT length is checked when parsing the nested attributes. */
1198         [OVS_CT_ATTR_NAT]       = { .minlen = 0, .maxlen = INT_MAX },
1199 #endif
1200         [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
1201                                     .maxlen = sizeof(u32) },
1202         [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
1203                                   .maxlen = CTNL_TIMEOUT_NAME_MAX },
1204 };
1205
1206 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1207                     const char **helper, bool log)
1208 {
1209         struct nlattr *a;
1210         int rem;
1211
1212         nla_for_each_nested(a, attr, rem) {
1213                 int type = nla_type(a);
1214                 int maxlen;
1215                 int minlen;
1216
1217                 if (type > OVS_CT_ATTR_MAX) {
1218                         OVS_NLERR(log,
1219                                   "Unknown conntrack attr (type=%d, max=%d)",
1220                                   type, OVS_CT_ATTR_MAX);
1221                         return -EINVAL;
1222                 }
1223
1224                 maxlen = ovs_ct_attr_lens[type].maxlen;
1225                 minlen = ovs_ct_attr_lens[type].minlen;
1226                 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1227                         OVS_NLERR(log,
1228                                   "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1229                                   type, nla_len(a), maxlen);
1230                         return -EINVAL;
1231                 }
1232
1233                 switch (type) {
1234                 case OVS_CT_ATTR_FORCE_COMMIT:
1235                         info->force = true;
1236                         fallthrough;
1237                 case OVS_CT_ATTR_COMMIT:
1238                         info->commit = true;
1239                         break;
1240 #ifdef CONFIG_NF_CONNTRACK_ZONES
1241                 case OVS_CT_ATTR_ZONE:
1242                         info->zone.id = nla_get_u16(a);
1243                         break;
1244 #endif
1245 #ifdef CONFIG_NF_CONNTRACK_MARK
1246                 case OVS_CT_ATTR_MARK: {
1247                         struct md_mark *mark = nla_data(a);
1248
1249                         if (!mark->mask) {
1250                                 OVS_NLERR(log, "ct_mark mask cannot be 0");
1251                                 return -EINVAL;
1252                         }
1253                         info->mark = *mark;
1254                         break;
1255                 }
1256 #endif
1257 #ifdef CONFIG_NF_CONNTRACK_LABELS
1258                 case OVS_CT_ATTR_LABELS: {
1259                         struct md_labels *labels = nla_data(a);
1260
1261                         if (!labels_nonzero(&labels->mask)) {
1262                                 OVS_NLERR(log, "ct_labels mask cannot be 0");
1263                                 return -EINVAL;
1264                         }
1265                         info->labels = *labels;
1266                         break;
1267                 }
1268 #endif
1269                 case OVS_CT_ATTR_HELPER:
1270                         *helper = nla_data(a);
1271                         if (!string_is_terminated(*helper, nla_len(a))) {
1272                                 OVS_NLERR(log, "Invalid conntrack helper");
1273                                 return -EINVAL;
1274                         }
1275                         break;
1276 #if IS_ENABLED(CONFIG_NF_NAT)
1277                 case OVS_CT_ATTR_NAT: {
1278                         int err = parse_nat(a, info, log);
1279
1280                         if (err)
1281                                 return err;
1282                         break;
1283                 }
1284 #endif
1285                 case OVS_CT_ATTR_EVENTMASK:
1286                         info->have_eventmask = true;
1287                         info->eventmask = nla_get_u32(a);
1288                         break;
1289 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1290                 case OVS_CT_ATTR_TIMEOUT:
1291                         memcpy(info->timeout, nla_data(a), nla_len(a));
1292                         if (!string_is_terminated(info->timeout, nla_len(a))) {
1293                                 OVS_NLERR(log, "Invalid conntrack timeout");
1294                                 return -EINVAL;
1295                         }
1296                         break;
1297 #endif
1298
1299                 default:
1300                         OVS_NLERR(log, "Unknown conntrack attr (%d)",
1301                                   type);
1302                         return -EINVAL;
1303                 }
1304         }
1305
1306 #ifdef CONFIG_NF_CONNTRACK_MARK
1307         if (!info->commit && info->mark.mask) {
1308                 OVS_NLERR(log,
1309                           "Setting conntrack mark requires 'commit' flag.");
1310                 return -EINVAL;
1311         }
1312 #endif
1313 #ifdef CONFIG_NF_CONNTRACK_LABELS
1314         if (!info->commit && labels_nonzero(&info->labels.mask)) {
1315                 OVS_NLERR(log,
1316                           "Setting conntrack labels requires 'commit' flag.");
1317                 return -EINVAL;
1318         }
1319 #endif
1320         if (rem > 0) {
1321                 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1322                 return -EINVAL;
1323         }
1324
1325         return 0;
1326 }
1327
1328 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1329 {
1330         if (attr == OVS_KEY_ATTR_CT_STATE)
1331                 return true;
1332         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1333             attr == OVS_KEY_ATTR_CT_ZONE)
1334                 return true;
1335         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1336             attr == OVS_KEY_ATTR_CT_MARK)
1337                 return true;
1338         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1339             attr == OVS_KEY_ATTR_CT_LABELS) {
1340                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1341
1342                 return ovs_net->xt_label;
1343         }
1344
1345         return false;
1346 }
1347
1348 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1349                        const struct sw_flow_key *key,
1350                        struct sw_flow_actions **sfa,  bool log)
1351 {
1352         struct ovs_conntrack_info ct_info;
1353         const char *helper = NULL;
1354         u16 family;
1355         int err;
1356
1357         family = key_to_nfproto(key);
1358         if (family == NFPROTO_UNSPEC) {
1359                 OVS_NLERR(log, "ct family unspecified");
1360                 return -EINVAL;
1361         }
1362
1363         memset(&ct_info, 0, sizeof(ct_info));
1364         ct_info.family = family;
1365
1366         nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1367                         NF_CT_DEFAULT_ZONE_DIR, 0);
1368
1369         err = parse_ct(attr, &ct_info, &helper, log);
1370         if (err)
1371                 return err;
1372
1373         /* Set up template for tracking connections in specific zones. */
1374         ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1375         if (!ct_info.ct) {
1376                 OVS_NLERR(log, "Failed to allocate conntrack template");
1377                 return -ENOMEM;
1378         }
1379
1380         if (ct_info.timeout[0]) {
1381                 if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
1382                                       ct_info.timeout))
1383                         pr_info_ratelimited("Failed to associated timeout "
1384                                             "policy `%s'\n", ct_info.timeout);
1385                 else
1386                         ct_info.nf_ct_timeout = rcu_dereference(
1387                                 nf_ct_timeout_find(ct_info.ct)->timeout);
1388
1389         }
1390
1391         if (helper) {
1392                 err = nf_ct_add_helper(ct_info.ct, helper, ct_info.family,
1393                                        key->ip.proto, ct_info.nat, &ct_info.helper);
1394                 if (err) {
1395                         OVS_NLERR(log, "Failed to add %s helper %d", helper, err);
1396                         goto err_free_ct;
1397                 }
1398         }
1399
1400         err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1401                                  sizeof(ct_info), log);
1402         if (err)
1403                 goto err_free_ct;
1404
1405         if (ct_info.commit)
1406                 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1407         return 0;
1408 err_free_ct:
1409         __ovs_ct_free_action(&ct_info);
1410         return err;
1411 }
1412
1413 #if IS_ENABLED(CONFIG_NF_NAT)
1414 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1415                                struct sk_buff *skb)
1416 {
1417         struct nlattr *start;
1418
1419         start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT);
1420         if (!start)
1421                 return false;
1422
1423         if (info->nat & OVS_CT_SRC_NAT) {
1424                 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1425                         return false;
1426         } else if (info->nat & OVS_CT_DST_NAT) {
1427                 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1428                         return false;
1429         } else {
1430                 goto out;
1431         }
1432
1433         if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1434                 if (IS_ENABLED(CONFIG_NF_NAT) &&
1435                     info->family == NFPROTO_IPV4) {
1436                         if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1437                                             info->range.min_addr.ip) ||
1438                             (info->range.max_addr.ip
1439                              != info->range.min_addr.ip &&
1440                              (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1441                                               info->range.max_addr.ip))))
1442                                 return false;
1443                 } else if (IS_ENABLED(CONFIG_IPV6) &&
1444                            info->family == NFPROTO_IPV6) {
1445                         if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1446                                              &info->range.min_addr.in6) ||
1447                             (memcmp(&info->range.max_addr.in6,
1448                                     &info->range.min_addr.in6,
1449                                     sizeof(info->range.max_addr.in6)) &&
1450                              (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1451                                                &info->range.max_addr.in6))))
1452                                 return false;
1453                 } else {
1454                         return false;
1455                 }
1456         }
1457         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1458             (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1459                          ntohs(info->range.min_proto.all)) ||
1460              (info->range.max_proto.all != info->range.min_proto.all &&
1461               nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1462                           ntohs(info->range.max_proto.all)))))
1463                 return false;
1464
1465         if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1466             nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1467                 return false;
1468         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1469             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1470                 return false;
1471         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1472             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1473                 return false;
1474 out:
1475         nla_nest_end(skb, start);
1476
1477         return true;
1478 }
1479 #endif
1480
1481 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1482                           struct sk_buff *skb)
1483 {
1484         struct nlattr *start;
1485
1486         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT);
1487         if (!start)
1488                 return -EMSGSIZE;
1489
1490         if (ct_info->commit && nla_put_flag(skb, ct_info->force
1491                                             ? OVS_CT_ATTR_FORCE_COMMIT
1492                                             : OVS_CT_ATTR_COMMIT))
1493                 return -EMSGSIZE;
1494         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1495             nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1496                 return -EMSGSIZE;
1497         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1498             nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1499                     &ct_info->mark))
1500                 return -EMSGSIZE;
1501         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1502             labels_nonzero(&ct_info->labels.mask) &&
1503             nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1504                     &ct_info->labels))
1505                 return -EMSGSIZE;
1506         if (ct_info->helper) {
1507                 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1508                                    ct_info->helper->name))
1509                         return -EMSGSIZE;
1510         }
1511         if (ct_info->have_eventmask &&
1512             nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
1513                 return -EMSGSIZE;
1514         if (ct_info->timeout[0]) {
1515                 if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout))
1516                         return -EMSGSIZE;
1517         }
1518
1519 #if IS_ENABLED(CONFIG_NF_NAT)
1520         if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1521                 return -EMSGSIZE;
1522 #endif
1523         nla_nest_end(skb, start);
1524
1525         return 0;
1526 }
1527
1528 void ovs_ct_free_action(const struct nlattr *a)
1529 {
1530         struct ovs_conntrack_info *ct_info = nla_data(a);
1531
1532         __ovs_ct_free_action(ct_info);
1533 }
1534
1535 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1536 {
1537         if (ct_info->helper) {
1538 #if IS_ENABLED(CONFIG_NF_NAT)
1539                 if (ct_info->nat)
1540                         nf_nat_helper_put(ct_info->helper);
1541 #endif
1542                 nf_conntrack_helper_put(ct_info->helper);
1543         }
1544         if (ct_info->ct) {
1545                 if (ct_info->timeout[0])
1546                         nf_ct_destroy_timeout(ct_info->ct);
1547                 nf_ct_tmpl_free(ct_info->ct);
1548         }
1549 }
1550
1551 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1552 static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
1553 {
1554         int i, err;
1555
1556         ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
1557                                          GFP_KERNEL);
1558         if (!ovs_net->ct_limit_info)
1559                 return -ENOMEM;
1560
1561         ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
1562         ovs_net->ct_limit_info->limits =
1563                 kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
1564                               GFP_KERNEL);
1565         if (!ovs_net->ct_limit_info->limits) {
1566                 kfree(ovs_net->ct_limit_info);
1567                 return -ENOMEM;
1568         }
1569
1570         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
1571                 INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
1572
1573         ovs_net->ct_limit_info->data =
1574                 nf_conncount_init(net, NFPROTO_INET, sizeof(u32));
1575
1576         if (IS_ERR(ovs_net->ct_limit_info->data)) {
1577                 err = PTR_ERR(ovs_net->ct_limit_info->data);
1578                 kfree(ovs_net->ct_limit_info->limits);
1579                 kfree(ovs_net->ct_limit_info);
1580                 pr_err("openvswitch: failed to init nf_conncount %d\n", err);
1581                 return err;
1582         }
1583         return 0;
1584 }
1585
1586 static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
1587 {
1588         const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
1589         int i;
1590
1591         nf_conncount_destroy(net, NFPROTO_INET, info->data);
1592         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1593                 struct hlist_head *head = &info->limits[i];
1594                 struct ovs_ct_limit *ct_limit;
1595
1596                 hlist_for_each_entry_rcu(ct_limit, head, hlist_node,
1597                                          lockdep_ovsl_is_held())
1598                         kfree_rcu(ct_limit, rcu);
1599         }
1600         kfree(info->limits);
1601         kfree(info);
1602 }
1603
1604 static struct sk_buff *
1605 ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
1606                              struct ovs_header **ovs_reply_header)
1607 {
1608         struct ovs_header *ovs_header = genl_info_userhdr(info);
1609         struct sk_buff *skb;
1610
1611         skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1612         if (!skb)
1613                 return ERR_PTR(-ENOMEM);
1614
1615         *ovs_reply_header = genlmsg_put(skb, info->snd_portid,
1616                                         info->snd_seq,
1617                                         &dp_ct_limit_genl_family, 0, cmd);
1618
1619         if (!*ovs_reply_header) {
1620                 nlmsg_free(skb);
1621                 return ERR_PTR(-EMSGSIZE);
1622         }
1623         (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
1624
1625         return skb;
1626 }
1627
1628 static bool check_zone_id(int zone_id, u16 *pzone)
1629 {
1630         if (zone_id >= 0 && zone_id <= 65535) {
1631                 *pzone = (u16)zone_id;
1632                 return true;
1633         }
1634         return false;
1635 }
1636
1637 static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
1638                                        struct ovs_ct_limit_info *info)
1639 {
1640         struct ovs_zone_limit *zone_limit;
1641         int rem;
1642         u16 zone;
1643
1644         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1645         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1646
1647         while (rem >= sizeof(*zone_limit)) {
1648                 if (unlikely(zone_limit->zone_id ==
1649                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1650                         ovs_lock();
1651                         info->default_limit = zone_limit->limit;
1652                         ovs_unlock();
1653                 } else if (unlikely(!check_zone_id(
1654                                 zone_limit->zone_id, &zone))) {
1655                         OVS_NLERR(true, "zone id is out of range");
1656                 } else {
1657                         struct ovs_ct_limit *ct_limit;
1658
1659                         ct_limit = kmalloc(sizeof(*ct_limit),
1660                                            GFP_KERNEL_ACCOUNT);
1661                         if (!ct_limit)
1662                                 return -ENOMEM;
1663
1664                         ct_limit->zone = zone;
1665                         ct_limit->limit = zone_limit->limit;
1666
1667                         ovs_lock();
1668                         ct_limit_set(info, ct_limit);
1669                         ovs_unlock();
1670                 }
1671                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1672                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1673                                 NLA_ALIGN(sizeof(*zone_limit)));
1674         }
1675
1676         if (rem)
1677                 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
1678
1679         return 0;
1680 }
1681
1682 static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
1683                                        struct ovs_ct_limit_info *info)
1684 {
1685         struct ovs_zone_limit *zone_limit;
1686         int rem;
1687         u16 zone;
1688
1689         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1690         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1691
1692         while (rem >= sizeof(*zone_limit)) {
1693                 if (unlikely(zone_limit->zone_id ==
1694                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1695                         ovs_lock();
1696                         info->default_limit = OVS_CT_LIMIT_DEFAULT;
1697                         ovs_unlock();
1698                 } else if (unlikely(!check_zone_id(
1699                                 zone_limit->zone_id, &zone))) {
1700                         OVS_NLERR(true, "zone id is out of range");
1701                 } else {
1702                         ovs_lock();
1703                         ct_limit_del(info, zone);
1704                         ovs_unlock();
1705                 }
1706                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1707                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1708                                 NLA_ALIGN(sizeof(*zone_limit)));
1709         }
1710
1711         if (rem)
1712                 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
1713
1714         return 0;
1715 }
1716
1717 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
1718                                           struct sk_buff *reply)
1719 {
1720         struct ovs_zone_limit zone_limit = {
1721                 .zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE,
1722                 .limit   = info->default_limit,
1723         };
1724
1725         return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1726 }
1727
1728 static int __ovs_ct_limit_get_zone_limit(struct net *net,
1729                                          struct nf_conncount_data *data,
1730                                          u16 zone_id, u32 limit,
1731                                          struct sk_buff *reply)
1732 {
1733         struct nf_conntrack_zone ct_zone;
1734         struct ovs_zone_limit zone_limit;
1735         u32 conncount_key = zone_id;
1736
1737         zone_limit.zone_id = zone_id;
1738         zone_limit.limit = limit;
1739         nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
1740
1741         zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
1742                                               &ct_zone);
1743         return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1744 }
1745
1746 static int ovs_ct_limit_get_zone_limit(struct net *net,
1747                                        struct nlattr *nla_zone_limit,
1748                                        struct ovs_ct_limit_info *info,
1749                                        struct sk_buff *reply)
1750 {
1751         struct ovs_zone_limit *zone_limit;
1752         int rem, err;
1753         u32 limit;
1754         u16 zone;
1755
1756         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1757         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1758
1759         while (rem >= sizeof(*zone_limit)) {
1760                 if (unlikely(zone_limit->zone_id ==
1761                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1762                         err = ovs_ct_limit_get_default_limit(info, reply);
1763                         if (err)
1764                                 return err;
1765                 } else if (unlikely(!check_zone_id(zone_limit->zone_id,
1766                                                         &zone))) {
1767                         OVS_NLERR(true, "zone id is out of range");
1768                 } else {
1769                         rcu_read_lock();
1770                         limit = ct_limit_get(info, zone);
1771                         rcu_read_unlock();
1772
1773                         err = __ovs_ct_limit_get_zone_limit(
1774                                 net, info->data, zone, limit, reply);
1775                         if (err)
1776                                 return err;
1777                 }
1778                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1779                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1780                                 NLA_ALIGN(sizeof(*zone_limit)));
1781         }
1782
1783         if (rem)
1784                 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
1785
1786         return 0;
1787 }
1788
1789 static int ovs_ct_limit_get_all_zone_limit(struct net *net,
1790                                            struct ovs_ct_limit_info *info,
1791                                            struct sk_buff *reply)
1792 {
1793         struct ovs_ct_limit *ct_limit;
1794         struct hlist_head *head;
1795         int i, err = 0;
1796
1797         err = ovs_ct_limit_get_default_limit(info, reply);
1798         if (err)
1799                 return err;
1800
1801         rcu_read_lock();
1802         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1803                 head = &info->limits[i];
1804                 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1805                         err = __ovs_ct_limit_get_zone_limit(net, info->data,
1806                                 ct_limit->zone, ct_limit->limit, reply);
1807                         if (err)
1808                                 goto exit_err;
1809                 }
1810         }
1811
1812 exit_err:
1813         rcu_read_unlock();
1814         return err;
1815 }
1816
1817 static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
1818 {
1819         struct nlattr **a = info->attrs;
1820         struct sk_buff *reply;
1821         struct ovs_header *ovs_reply_header;
1822         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1823         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1824         int err;
1825
1826         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
1827                                              &ovs_reply_header);
1828         if (IS_ERR(reply))
1829                 return PTR_ERR(reply);
1830
1831         if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1832                 err = -EINVAL;
1833                 goto exit_err;
1834         }
1835
1836         err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1837                                           ct_limit_info);
1838         if (err)
1839                 goto exit_err;
1840
1841         static_branch_enable(&ovs_ct_limit_enabled);
1842
1843         genlmsg_end(reply, ovs_reply_header);
1844         return genlmsg_reply(reply, info);
1845
1846 exit_err:
1847         nlmsg_free(reply);
1848         return err;
1849 }
1850
1851 static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
1852 {
1853         struct nlattr **a = info->attrs;
1854         struct sk_buff *reply;
1855         struct ovs_header *ovs_reply_header;
1856         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1857         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1858         int err;
1859
1860         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
1861                                              &ovs_reply_header);
1862         if (IS_ERR(reply))
1863                 return PTR_ERR(reply);
1864
1865         if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1866                 err = -EINVAL;
1867                 goto exit_err;
1868         }
1869
1870         err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1871                                           ct_limit_info);
1872         if (err)
1873                 goto exit_err;
1874
1875         genlmsg_end(reply, ovs_reply_header);
1876         return genlmsg_reply(reply, info);
1877
1878 exit_err:
1879         nlmsg_free(reply);
1880         return err;
1881 }
1882
1883 static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
1884 {
1885         struct nlattr **a = info->attrs;
1886         struct nlattr *nla_reply;
1887         struct sk_buff *reply;
1888         struct ovs_header *ovs_reply_header;
1889         struct net *net = sock_net(skb->sk);
1890         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1891         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1892         int err;
1893
1894         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
1895                                              &ovs_reply_header);
1896         if (IS_ERR(reply))
1897                 return PTR_ERR(reply);
1898
1899         nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
1900         if (!nla_reply) {
1901                 err = -EMSGSIZE;
1902                 goto exit_err;
1903         }
1904
1905         if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1906                 err = ovs_ct_limit_get_zone_limit(
1907                         net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
1908                         reply);
1909                 if (err)
1910                         goto exit_err;
1911         } else {
1912                 err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
1913                                                       reply);
1914                 if (err)
1915                         goto exit_err;
1916         }
1917
1918         nla_nest_end(reply, nla_reply);
1919         genlmsg_end(reply, ovs_reply_header);
1920         return genlmsg_reply(reply, info);
1921
1922 exit_err:
1923         nlmsg_free(reply);
1924         return err;
1925 }
1926
1927 static const struct genl_small_ops ct_limit_genl_ops[] = {
1928         { .cmd = OVS_CT_LIMIT_CMD_SET,
1929                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1930                 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1931                                                * privilege.
1932                                                */
1933                 .doit = ovs_ct_limit_cmd_set,
1934         },
1935         { .cmd = OVS_CT_LIMIT_CMD_DEL,
1936                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1937                 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1938                                                * privilege.
1939                                                */
1940                 .doit = ovs_ct_limit_cmd_del,
1941         },
1942         { .cmd = OVS_CT_LIMIT_CMD_GET,
1943                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1944                 .flags = 0,               /* OK for unprivileged users. */
1945                 .doit = ovs_ct_limit_cmd_get,
1946         },
1947 };
1948
1949 static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
1950         .name = OVS_CT_LIMIT_MCGROUP,
1951 };
1952
1953 struct genl_family dp_ct_limit_genl_family __ro_after_init = {
1954         .hdrsize = sizeof(struct ovs_header),
1955         .name = OVS_CT_LIMIT_FAMILY,
1956         .version = OVS_CT_LIMIT_VERSION,
1957         .maxattr = OVS_CT_LIMIT_ATTR_MAX,
1958         .policy = ct_limit_policy,
1959         .netnsok = true,
1960         .parallel_ops = true,
1961         .small_ops = ct_limit_genl_ops,
1962         .n_small_ops = ARRAY_SIZE(ct_limit_genl_ops),
1963         .resv_start_op = OVS_CT_LIMIT_CMD_GET + 1,
1964         .mcgrps = &ovs_ct_limit_multicast_group,
1965         .n_mcgrps = 1,
1966         .module = THIS_MODULE,
1967 };
1968 #endif
1969
1970 int ovs_ct_init(struct net *net)
1971 {
1972         unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1973         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1974
1975         if (nf_connlabels_get(net, n_bits - 1)) {
1976                 ovs_net->xt_label = false;
1977                 OVS_NLERR(true, "Failed to set connlabel length");
1978         } else {
1979                 ovs_net->xt_label = true;
1980         }
1981
1982 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1983         return ovs_ct_limit_init(net, ovs_net);
1984 #else
1985         return 0;
1986 #endif
1987 }
1988
1989 void ovs_ct_exit(struct net *net)
1990 {
1991         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1992
1993 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1994         ovs_ct_limit_exit(net, ovs_net);
1995 #endif
1996
1997         if (ovs_net->xt_label)
1998                 nf_connlabels_put(net);
1999 }