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 = NULL;
 172
 173         if (ct) {
 174                 if (ct->master && !nf_ct_is_confirmed(ct))
 175                         ct = ct->master;
 176                 cl = nf_ct_labels_find(ct);
 177         }
 178         if (cl)
 179                 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
 180         else
 181                 memset(labels, 0, OVS_CT_LABELS_LEN);
 182 }
 183
 184 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
 185                                         const struct nf_conntrack_tuple *orig,
 186                                         u8 icmp_proto)
 187 {
 188         key->ct_orig_proto = orig->dst.protonum;
 189         if (orig->dst.protonum == icmp_proto) {
 190                 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
 191                 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
 192         } else {
 193                 key->ct.orig_tp.src = orig->src.u.all;
 194                 key->ct.orig_tp.dst = orig->dst.u.all;
 195         }
 196 }
 197
 198 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
 199                                 const struct nf_conntrack_zone *zone,
 200                                 const struct nf_conn *ct)
 201 {
 202         key->ct_state = state;
 203         key->ct_zone = zone->id;
 204         key->ct.mark = ovs_ct_get_mark(ct);
 205         ovs_ct_get_labels(ct, &key->ct.labels);
 206
 207         if (ct) {
 208                 const struct nf_conntrack_tuple *orig;
 209
 210                 /* Use the master if we have one. */
 211                 if (ct->master)
 212                         ct = ct->master;
 213                 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
 214
 215                 /* IP version must match with the master connection. */
 216                 if (key->eth.type == htons(ETH_P_IP) &&
 217                     nf_ct_l3num(ct) == NFPROTO_IPV4) {
 218                         key->ipv4.ct_orig.src = orig->src.u3.ip;
 219                         key->ipv4.ct_orig.dst = orig->dst.u3.ip;
 220                         __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
 221                         return;
 222                 } else if (key->eth.type == htons(ETH_P_IPV6) &&
 223                            !sw_flow_key_is_nd(key) &&
 224                            nf_ct_l3num(ct) == NFPROTO_IPV6) {
 225                         key->ipv6.ct_orig.src = orig->src.u3.in6;
 226                         key->ipv6.ct_orig.dst = orig->dst.u3.in6;
 227                         __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
 228                         return;
 229                 }
 230         }
 231         /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
 232          * original direction key fields.
 233          */
 234         key->ct_orig_proto = 0;
 235 }
 236
 237 /* Update 'key' based on skb->_nfct.  If 'post_ct' is true, then OVS has
 238  * previously sent the packet to conntrack via the ct action.  If
 239  * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
 240  * initialized from the connection status.
 241  */
 242 static void ovs_ct_update_key(const struct sk_buff *skb,
 243                               const struct ovs_conntrack_info *info,
 244                               struct sw_flow_key *key, bool post_ct,
 245                               bool keep_nat_flags)
 246 {
 247         const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
 248         enum ip_conntrack_info ctinfo;
 249         struct nf_conn *ct;
 250         u8 state = 0;
 251
 252         ct = nf_ct_get(skb, &ctinfo);
 253         if (ct) {
 254                 state = ovs_ct_get_state(ctinfo);
 255                 /* All unconfirmed entries are NEW connections. */
 256                 if (!nf_ct_is_confirmed(ct))
 257                         state |= OVS_CS_F_NEW;
 258                 /* OVS persists the related flag for the duration of the
 259                  * connection.
 260                  */
 261                 if (ct->master)
 262                         state |= OVS_CS_F_RELATED;
 263                 if (keep_nat_flags) {
 264                         state |= key->ct_state & OVS_CS_F_NAT_MASK;
 265                 } else {
 266                         if (ct->status & IPS_SRC_NAT)
 267                                 state |= OVS_CS_F_SRC_NAT;
 268                         if (ct->status & IPS_DST_NAT)
 269                                 state |= OVS_CS_F_DST_NAT;
 270                 }
 271                 zone = nf_ct_zone(ct);
 272         } else if (post_ct) {
 273                 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
 274                 if (info)
 275                         zone = &info->zone;
 276         }
 277         __ovs_ct_update_key(key, state, zone, ct);
 278 }
 279
 280 /* This is called to initialize CT key fields possibly coming in from the local
 281  * stack.
 282  */
 283 void ovs_ct_fill_key(const struct sk_buff *skb,
 284                      struct sw_flow_key *key,
 285                      bool post_ct)
 286 {
 287         ovs_ct_update_key(skb, NULL, key, post_ct, false);
 288 }
 289
 290 int ovs_ct_put_key(const struct sw_flow_key *swkey,
 291                    const struct sw_flow_key *output, struct sk_buff *skb)
 292 {
 293         if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
 294                 return -EMSGSIZE;
 295
 296         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 297             nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
 298                 return -EMSGSIZE;
 299
 300         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
 301             nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
 302                 return -EMSGSIZE;
 303
 304         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
 305             nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
 306                     &output->ct.labels))
 307                 return -EMSGSIZE;
 308
 309         if (swkey->ct_orig_proto) {
 310                 if (swkey->eth.type == htons(ETH_P_IP)) {
 311                         struct ovs_key_ct_tuple_ipv4 orig;
 312
 313                         memset(&orig, 0, sizeof(orig));
 314                         orig.ipv4_src = output->ipv4.ct_orig.src;
 315                         orig.ipv4_dst = output->ipv4.ct_orig.dst;
 316                         orig.src_port = output->ct.orig_tp.src;
 317                         orig.dst_port = output->ct.orig_tp.dst;
 318                         orig.ipv4_proto = output->ct_orig_proto;
 319
 320                         if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
 321                                     sizeof(orig), &orig))
 322                                 return -EMSGSIZE;
 323                 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
 324                         struct ovs_key_ct_tuple_ipv6 orig;
 325
 326                         memset(&orig, 0, sizeof(orig));
 327                         memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32,
 328                                sizeof(orig.ipv6_src));
 329                         memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32,
 330                                sizeof(orig.ipv6_dst));
 331                         orig.src_port = output->ct.orig_tp.src;
 332                         orig.dst_port = output->ct.orig_tp.dst;
 333                         orig.ipv6_proto = output->ct_orig_proto;
 334
 335                         if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
 336                                     sizeof(orig), &orig))
 337                                 return -EMSGSIZE;
 338                 }
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
 345                            u32 ct_mark, u32 mask)
 346 {
 347 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 348         u32 new_mark;
 349
 350         new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask));
 351         if (READ_ONCE(ct->mark) != new_mark) {
 352                 WRITE_ONCE(ct->mark, new_mark);
 353                 if (nf_ct_is_confirmed(ct))
 354                         nf_conntrack_event_cache(IPCT_MARK, ct);
 355                 key->ct.mark = new_mark;
 356         }
 357
 358         return 0;
 359 #else
 360         return -ENOTSUPP;
 361 #endif
 362 }
 363
 364 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
 365 {
 366         struct nf_conn_labels *cl;
 367
 368         cl = nf_ct_labels_find(ct);
 369         if (!cl) {
 370                 nf_ct_labels_ext_add(ct);
 371                 cl = nf_ct_labels_find(ct);
 372         }
 373
 374         return cl;
 375 }
 376
 377 /* Initialize labels for a new, yet to be committed conntrack entry.  Note that
 378  * since the new connection is not yet confirmed, and thus no-one else has
 379  * access to it's labels, we simply write them over.
 380  */
 381 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
 382                               const struct ovs_key_ct_labels *labels,
 383                               const struct ovs_key_ct_labels *mask)
 384 {
 385         struct nf_conn_labels *cl, *master_cl;
 386         bool have_mask = labels_nonzero(mask);
 387
 388         /* Inherit master's labels to the related connection? */
 389         master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
 390
 391         if (!master_cl && !have_mask)
 392                 return 0;   /* Nothing to do. */
 393
 394         cl = ovs_ct_get_conn_labels(ct);
 395         if (!cl)
 396                 return -ENOSPC;
 397
 398         /* Inherit the master's labels, if any. */
 399         if (master_cl)
 400                 *cl = *master_cl;
 401
 402         if (have_mask) {
 403                 u32 *dst = (u32 *)cl->bits;
 404                 int i;
 405
 406                 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
 407                         dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
 408                                 (labels->ct_labels_32[i]
 409                                  & mask->ct_labels_32[i]);
 410         }
 411
 412         /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
 413          * IPCT_LABEL bit is set in the event cache.
 414          */
 415         nf_conntrack_event_cache(IPCT_LABEL, ct);
 416
 417         memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
 418
 419         return 0;
 420 }
 421
 422 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
 423                              const struct ovs_key_ct_labels *labels,
 424                              const struct ovs_key_ct_labels *mask)
 425 {
 426         struct nf_conn_labels *cl;
 427         int err;
 428
 429         cl = ovs_ct_get_conn_labels(ct);
 430         if (!cl)
 431                 return -ENOSPC;
 432
 433         err = nf_connlabels_replace(ct, labels->ct_labels_32,
 434                                     mask->ct_labels_32,
 435                                     OVS_CT_LABELS_LEN_32);
 436         if (err)
 437                 return err;
 438
 439         memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
 440
 441         return 0;
 442 }
 443
 444 static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
 445                                    u16 zone, int family, struct sk_buff *skb)
 446 {
 447         struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
 448         int err;
 449
 450         err = nf_ct_handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
 451         if (err)
 452                 return err;
 453
 454         /* The key extracted from the fragment that completed this datagram
 455          * likely didn't have an L4 header, so regenerate it.
 456          */
 457         ovs_flow_key_update_l3l4(skb, key);
 458         key->ip.frag = OVS_FRAG_TYPE_NONE;
 459         *OVS_CB(skb) = ovs_cb;
 460
 461         return 0;
 462 }
 463
 464 /* This replicates logic from nf_conntrack_core.c that is not exported. */
 465 static enum ip_conntrack_info
 466 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
 467 {
 468         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
 469
 470         if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
 471                 return IP_CT_ESTABLISHED_REPLY;
 472         /* Once we've had two way comms, always ESTABLISHED. */
 473         if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
 474                 return IP_CT_ESTABLISHED;
 475         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
 476                 return IP_CT_RELATED;
 477         return IP_CT_NEW;
 478 }
 479
 480 /* Find an existing connection which this packet belongs to without
 481  * re-attributing statistics or modifying the connection state.  This allows an
 482  * skb->_nfct lost due to an upcall to be recovered during actions execution.
 483  *
 484  * Must be called with rcu_read_lock.
 485  *
 486  * On success, populates skb->_nfct and returns the connection.  Returns NULL
 487  * if there is no existing entry.
 488  */
 489 static struct nf_conn *
 490 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
 491                      u8 l3num, struct sk_buff *skb, bool natted)
 492 {
 493         struct nf_conntrack_tuple tuple;
 494         struct nf_conntrack_tuple_hash *h;
 495         struct nf_conn *ct;
 496
 497         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
 498                                net, &tuple)) {
 499                 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
 500                 return NULL;
 501         }
 502
 503         /* Must invert the tuple if skb has been transformed by NAT. */
 504         if (natted) {
 505                 struct nf_conntrack_tuple inverse;
 506
 507                 if (!nf_ct_invert_tuple(&inverse, &tuple)) {
 508                         pr_debug("ovs_ct_find_existing: Inversion failed!\n");
 509                         return NULL;
 510                 }
 511                 tuple = inverse;
 512         }
 513
 514         /* look for tuple match */
 515         h = nf_conntrack_find_get(net, zone, &tuple);
 516         if (!h)
 517                 return NULL;   /* Not found. */
 518
 519         ct = nf_ct_tuplehash_to_ctrack(h);
 520
 521         /* Inverted packet tuple matches the reverse direction conntrack tuple,
 522          * select the other tuplehash to get the right 'ctinfo' bits for this
 523          * packet.
 524          */
 525         if (natted)
 526                 h = &ct->tuplehash[!h->tuple.dst.dir];
 527
 528         nf_ct_set(skb, ct, ovs_ct_get_info(h));
 529         return ct;
 530 }
 531
 532 static
 533 struct nf_conn *ovs_ct_executed(struct net *net,
 534                                 const struct sw_flow_key *key,
 535                                 const struct ovs_conntrack_info *info,
 536                                 struct sk_buff *skb,
 537                                 bool *ct_executed)
 538 {
 539         struct nf_conn *ct = NULL;
 540
 541         /* If no ct, check if we have evidence that an existing conntrack entry
 542          * might be found for this skb.  This happens when we lose a skb->_nfct
 543          * due to an upcall, or if the direction is being forced.  If the
 544          * connection was not confirmed, it is not cached and needs to be run
 545          * through conntrack again.
 546          */
 547         *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
 548                        !(key->ct_state & OVS_CS_F_INVALID) &&
 549                        (key->ct_zone == info->zone.id);
 550
 551         if (*ct_executed || (!key->ct_state && info->force)) {
 552                 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
 553                                           !!(key->ct_state &
 554                                           OVS_CS_F_NAT_MASK));
 555         }
 556
 557         return ct;
 558 }
 559
 560 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
 561 static bool skb_nfct_cached(struct net *net,
 562                             const struct sw_flow_key *key,
 563                             const struct ovs_conntrack_info *info,
 564                             struct sk_buff *skb)
 565 {
 566         enum ip_conntrack_info ctinfo;
 567         struct nf_conn *ct;
 568         bool ct_executed = true;
 569
 570         ct = nf_ct_get(skb, &ctinfo);
 571         if (!ct)
 572                 ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
 573
 574         if (ct)
 575                 nf_ct_get(skb, &ctinfo);
 576         else
 577                 return false;
 578
 579         if (!net_eq(net, read_pnet(&ct->ct_net)))
 580                 return false;
 581         if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
 582                 return false;
 583         if (info->helper) {
 584                 struct nf_conn_help *help;
 585
 586                 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
 587                 if (help && rcu_access_pointer(help->helper) != info->helper)
 588                         return false;
 589         }
 590         if (info->nf_ct_timeout) {
 591                 struct nf_conn_timeout *timeout_ext;
 592
 593                 timeout_ext = nf_ct_timeout_find(ct);
 594                 if (!timeout_ext || info->nf_ct_timeout !=
 595                     rcu_dereference(timeout_ext->timeout))
 596                         return false;
 597         }
 598         /* Force conntrack entry direction to the current packet? */
 599         if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
 600                 /* Delete the conntrack entry if confirmed, else just release
 601                  * the reference.
 602                  */
 603                 if (nf_ct_is_confirmed(ct))
 604                         nf_ct_delete(ct, 0, 0);
 605
 606                 nf_ct_put(ct);
 607                 nf_ct_set(skb, NULL, 0);
 608                 return false;
 609         }
 610
 611         return ct_executed;
 612 }
 613
 614 #if IS_ENABLED(CONFIG_NF_NAT)
 615 static void ovs_nat_update_key(struct sw_flow_key *key,
 616                                const struct sk_buff *skb,
 617                                enum nf_nat_manip_type maniptype)
 618 {
 619         if (maniptype == NF_NAT_MANIP_SRC) {
 620                 __be16 src;
 621
 622                 key->ct_state |= OVS_CS_F_SRC_NAT;
 623                 if (key->eth.type == htons(ETH_P_IP))
 624                         key->ipv4.addr.src = ip_hdr(skb)->saddr;
 625                 else if (key->eth.type == htons(ETH_P_IPV6))
 626                         memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
 627                                sizeof(key->ipv6.addr.src));
 628                 else
 629                         return;
 630
 631                 if (key->ip.proto == IPPROTO_UDP)
 632                         src = udp_hdr(skb)->source;
 633                 else if (key->ip.proto == IPPROTO_TCP)
 634                         src = tcp_hdr(skb)->source;
 635                 else if (key->ip.proto == IPPROTO_SCTP)
 636                         src = sctp_hdr(skb)->source;
 637                 else
 638                         return;
 639
 640                 key->tp.src = src;
 641         } else {
 642                 __be16 dst;
 643
 644                 key->ct_state |= OVS_CS_F_DST_NAT;
 645                 if (key->eth.type == htons(ETH_P_IP))
 646                         key->ipv4.addr.dst = ip_hdr(skb)->daddr;
 647                 else if (key->eth.type == htons(ETH_P_IPV6))
 648                         memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
 649                                sizeof(key->ipv6.addr.dst));
 650                 else
 651                         return;
 652
 653                 if (key->ip.proto == IPPROTO_UDP)
 654                         dst = udp_hdr(skb)->dest;
 655                 else if (key->ip.proto == IPPROTO_TCP)
 656                         dst = tcp_hdr(skb)->dest;
 657                 else if (key->ip.proto == IPPROTO_SCTP)
 658                         dst = sctp_hdr(skb)->dest;
 659                 else
 660                         return;
 661
 662                 key->tp.dst = dst;
 663         }
 664 }
 665
 666 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
 667 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
 668                       const struct ovs_conntrack_info *info,
 669                       struct sk_buff *skb, struct nf_conn *ct,
 670                       enum ip_conntrack_info ctinfo)
 671 {
 672         int err, action = 0;
 673
 674         if (!(info->nat & OVS_CT_NAT))
 675                 return NF_ACCEPT;
 676         if (info->nat & OVS_CT_SRC_NAT)
 677                 action |= BIT(NF_NAT_MANIP_SRC);
 678         if (info->nat & OVS_CT_DST_NAT)
 679                 action |= BIT(NF_NAT_MANIP_DST);
 680
 681         err = nf_ct_nat(skb, ct, ctinfo, &action, &info->range, info->commit);
 682         if (err != NF_ACCEPT)
 683                 return err;
 684
 685         if (action & BIT(NF_NAT_MANIP_SRC))
 686                 ovs_nat_update_key(key, skb, NF_NAT_MANIP_SRC);
 687         if (action & BIT(NF_NAT_MANIP_DST))
 688                 ovs_nat_update_key(key, skb, NF_NAT_MANIP_DST);
 689
 690         return err;
 691 }
 692 #else /* !CONFIG_NF_NAT */
 693 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
 694                       const struct ovs_conntrack_info *info,
 695                       struct sk_buff *skb, struct nf_conn *ct,
 696                       enum ip_conntrack_info ctinfo)
 697 {
 698         return NF_ACCEPT;
 699 }
 700 #endif
 701
 702 static int verdict_to_errno(unsigned int verdict)
 703 {
 704         switch (verdict & NF_VERDICT_MASK) {
 705         case NF_ACCEPT:
 706                 return 0;
 707         case NF_DROP:
 708                 return -EINVAL;
 709         case NF_STOLEN:
 710                 return -EINPROGRESS;
 711         default:
 712                 break;
 713         }
 714
 715         return -EINVAL;
 716 }
 717
 718 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
 719  * not done already.  Update key with new CT state after passing the packet
 720  * through conntrack.
 721  * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
 722  * set to NULL and 0 will be returned.
 723  */
 724 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 725                            const struct ovs_conntrack_info *info,
 726                            struct sk_buff *skb)
 727 {
 728         /* If we are recirculating packets to match on conntrack fields and
 729          * committing with a separate conntrack action,  then we don't need to
 730          * actually run the packet through conntrack twice unless it's for a
 731          * different zone.
 732          */
 733         bool cached = skb_nfct_cached(net, key, info, skb);
 734         enum ip_conntrack_info ctinfo;
 735         struct nf_conn *ct;
 736
 737         if (!cached) {
 738                 struct nf_hook_state state = {
 739                         .hook = NF_INET_PRE_ROUTING,
 740                         .pf = info->family,
 741                         .net = net,
 742                 };
 743                 struct nf_conn *tmpl = info->ct;
 744                 int err;
 745
 746                 /* Associate skb with specified zone. */
 747                 if (tmpl) {
 748                         ct = nf_ct_get(skb, &ctinfo);
 749                         nf_ct_put(ct);
 750                         nf_conntrack_get(&tmpl->ct_general);
 751                         nf_ct_set(skb, tmpl, IP_CT_NEW);
 752                 }
 753
 754                 err = nf_conntrack_in(skb, &state);
 755                 if (err != NF_ACCEPT)
 756                         return verdict_to_errno(err);
 757
 758                 /* Clear CT state NAT flags to mark that we have not yet done
 759                  * NAT after the nf_conntrack_in() call.  We can actually clear
 760                  * the whole state, as it will be re-initialized below.
 761                  */
 762                 key->ct_state = 0;
 763
 764                 /* Update the key, but keep the NAT flags. */
 765                 ovs_ct_update_key(skb, info, key, true, true);
 766         }
 767
 768         ct = nf_ct_get(skb, &ctinfo);
 769         if (ct) {
 770                 bool add_helper = false;
 771
 772                 /* Packets starting a new connection must be NATted before the
 773                  * helper, so that the helper knows about the NAT.  We enforce
 774                  * this by delaying both NAT and helper calls for unconfirmed
 775                  * connections until the committing CT action.  For later
 776                  * packets NAT and Helper may be called in either order.
 777                  *
 778                  * NAT will be done only if the CT action has NAT, and only
 779                  * once per packet (per zone), as guarded by the NAT bits in
 780                  * the key->ct_state.
 781                  */
 782                 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
 783                     (nf_ct_is_confirmed(ct) || info->commit)) {
 784                         int err = ovs_ct_nat(net, key, info, skb, ct, ctinfo);
 785
 786                         err = verdict_to_errno(err);
 787                         if (err)
 788                                 return err;
 789                 }
 790
 791                 /* Userspace may decide to perform a ct lookup without a helper
 792                  * specified followed by a (recirculate and) commit with one,
 793                  * or attach a helper in a later commit.  Therefore, for
 794                  * connections which we will commit, we may need to attach
 795                  * the helper here.
 796                  */
 797                 if (!nf_ct_is_confirmed(ct) && info->commit &&
 798                     info->helper && !nfct_help(ct)) {
 799                         int err = __nf_ct_try_assign_helper(ct, info->ct,
 800                                                             GFP_ATOMIC);
 801                         if (err)
 802                                 return err;
 803                         add_helper = true;
 804
 805                         /* helper installed, add seqadj if NAT is required */
 806                         if (info->nat && !nfct_seqadj(ct)) {
 807                                 if (!nfct_seqadj_ext_add(ct))
 808                                         return -EINVAL;
 809                         }
 810                 }
 811
 812                 /* Call the helper only if:
 813                  * - nf_conntrack_in() was executed above ("!cached") or a
 814                  *   helper was just attached ("add_helper") for a confirmed
 815                  *   connection, or
 816                  * - When committing an unconfirmed connection.
 817                  */
 818                 if ((nf_ct_is_confirmed(ct) ? !cached || add_helper :
 819                                               info->commit)) {
 820                         int err = nf_ct_helper(skb, ct, ctinfo, info->family);
 821
 822                         err = verdict_to_errno(err);
 823                         if (err)
 824                                 return err;
 825                 }
 826
 827                 if (nf_ct_protonum(ct) == IPPROTO_TCP &&
 828                     nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) {
 829                         /* Be liberal for tcp packets so that out-of-window
 830                          * packets are not marked invalid.
 831                          */
 832                         nf_ct_set_tcp_be_liberal(ct);
 833                 }
 834
 835                 nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
 836         }
 837
 838         return 0;
 839 }
 840
 841 /* Lookup connection and read fields into key. */
 842 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 843                          const struct ovs_conntrack_info *info,
 844                          struct sk_buff *skb)
 845 {
 846         struct nf_conn *ct;
 847         int err;
 848
 849         err = __ovs_ct_lookup(net, key, info, skb);
 850         if (err)
 851                 return err;
 852
 853         ct = (struct nf_conn *)skb_nfct(skb);
 854         if (ct)
 855                 nf_ct_deliver_cached_events(ct);
 856
 857         return 0;
 858 }
 859
 860 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
 861 {
 862         size_t i;
 863
 864         for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
 865                 if (labels->ct_labels_32[i])
 866                         return true;
 867
 868         return false;
 869 }
 870
 871 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
 872 static struct hlist_head *ct_limit_hash_bucket(
 873         const struct ovs_ct_limit_info *info, u16 zone)
 874 {
 875         return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
 876 }
 877
 878 /* Call with ovs_mutex */
 879 static void ct_limit_set(const struct ovs_ct_limit_info *info,
 880                          struct ovs_ct_limit *new_ct_limit)
 881 {
 882         struct ovs_ct_limit *ct_limit;
 883         struct hlist_head *head;
 884
 885         head = ct_limit_hash_bucket(info, new_ct_limit->zone);
 886         hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
 887                 if (ct_limit->zone == new_ct_limit->zone) {
 888                         hlist_replace_rcu(&ct_limit->hlist_node,
 889                                           &new_ct_limit->hlist_node);
 890                         kfree_rcu(ct_limit, rcu);
 891                         return;
 892                 }
 893         }
 894
 895         hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
 896 }
 897
 898 /* Call with ovs_mutex */
 899 static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
 900 {
 901         struct ovs_ct_limit *ct_limit;
 902         struct hlist_head *head;
 903         struct hlist_node *n;
 904
 905         head = ct_limit_hash_bucket(info, zone);
 906         hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
 907                 if (ct_limit->zone == zone) {
 908                         hlist_del_rcu(&ct_limit->hlist_node);
 909                         kfree_rcu(ct_limit, rcu);
 910                         return;
 911                 }
 912         }
 913 }
 914
 915 /* Call with RCU read lock */
 916 static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
 917 {
 918         struct ovs_ct_limit *ct_limit;
 919         struct hlist_head *head;
 920
 921         head = ct_limit_hash_bucket(info, zone);
 922         hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
 923                 if (ct_limit->zone == zone)
 924                         return ct_limit->limit;
 925         }
 926
 927         return info->default_limit;
 928 }
 929
 930 static int ovs_ct_check_limit(struct net *net,
 931                               const struct ovs_conntrack_info *info,
 932                               const struct nf_conntrack_tuple *tuple)
 933 {
 934         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
 935         const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
 936         u32 per_zone_limit, connections;
 937         u32 conncount_key;
 938
 939         conncount_key = info->zone.id;
 940
 941         per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
 942         if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
 943                 return 0;
 944
 945         connections = nf_conncount_count(net, ct_limit_info->data,
 946                                          &conncount_key, tuple, &info->zone);
 947         if (connections > per_zone_limit)
 948                 return -ENOMEM;
 949
 950         return 0;
 951 }
 952 #endif
 953
 954 /* Lookup connection and confirm if unconfirmed. */
 955 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
 956                          const struct ovs_conntrack_info *info,
 957                          struct sk_buff *skb)
 958 {
 959         enum ip_conntrack_info ctinfo;
 960         struct nf_conn *ct;
 961         int err;
 962
 963         err = __ovs_ct_lookup(net, key, info, skb);
 964         if (err)
 965                 return err;
 966
 967         /* The connection could be invalid, in which case this is a no-op.*/
 968         ct = nf_ct_get(skb, &ctinfo);
 969         if (!ct)
 970                 return 0;
 971
 972 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
 973         if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
 974                 if (!nf_ct_is_confirmed(ct)) {
 975                         err = ovs_ct_check_limit(net, info,
 976                                 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 977                         if (err) {
 978                                 net_warn_ratelimited("openvswitch: zone: %u "
 979                                         "exceeds conntrack limit\n",
 980                                         info->zone.id);
 981                                 return err;
 982                         }
 983                 }
 984         }
 985 #endif
 986
 987         /* Set the conntrack event mask if given.  NEW and DELETE events have
 988          * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
 989          * typically would receive many kinds of updates.  Setting the event
 990          * mask allows those events to be filtered.  The set event mask will
 991          * remain in effect for the lifetime of the connection unless changed
 992          * by a further CT action with both the commit flag and the eventmask
 993          * option. */
 994         if (info->have_eventmask) {
 995                 struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
 996
 997                 if (cache)
 998                         cache->ctmask = info->eventmask;
 999         }
1000
1001         /* Apply changes before confirming the connection so that the initial
1002          * conntrack NEW netlink event carries the values given in the CT
1003          * action.
1004          */
1005         if (info->mark.mask) {
1006                 err = ovs_ct_set_mark(ct, key, info->mark.value,
1007                                       info->mark.mask);
1008                 if (err)
1009                         return err;
1010         }
1011         if (!nf_ct_is_confirmed(ct)) {
1012                 err = ovs_ct_init_labels(ct, key, &info->labels.value,
1013                                          &info->labels.mask);
1014                 if (err)
1015                         return err;
1016
1017                 nf_conn_act_ct_ext_add(skb, ct, ctinfo);
1018         } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1019                    labels_nonzero(&info->labels.mask)) {
1020                 err = ovs_ct_set_labels(ct, key, &info->labels.value,
1021                                         &info->labels.mask);
1022                 if (err)
1023                         return err;
1024         }
1025         /* This will take care of sending queued events even if the connection
1026          * is already confirmed.
1027          */
1028         err = nf_conntrack_confirm(skb);
1029
1030         return verdict_to_errno(err);
1031 }
1032
1033 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1034  * value if 'skb' is freed.
1035  */
1036 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1037                    struct sw_flow_key *key,
1038                    const struct ovs_conntrack_info *info)
1039 {
1040         int nh_ofs;
1041         int err;
1042
1043         /* The conntrack module expects to be working at L3. */
1044         nh_ofs = skb_network_offset(skb);
1045         skb_pull_rcsum(skb, nh_ofs);
1046
1047         err = nf_ct_skb_network_trim(skb, info->family);
1048         if (err) {
1049                 kfree_skb(skb);
1050                 return err;
1051         }
1052
1053         if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1054                 err = ovs_ct_handle_fragments(net, key, info->zone.id,
1055                                               info->family, skb);
1056                 if (err)
1057                         return err;
1058         }
1059
1060         if (info->commit)
1061                 err = ovs_ct_commit(net, key, info, skb);
1062         else
1063                 err = ovs_ct_lookup(net, key, info, skb);
1064
1065         /* conntrack core returned NF_STOLEN */
1066         if (err == -EINPROGRESS)
1067                 return err;
1068
1069         skb_push_rcsum(skb, nh_ofs);
1070         if (err)
1071                 ovs_kfree_skb_reason(skb, OVS_DROP_CONNTRACK);
1072         return err;
1073 }
1074
1075 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
1076 {
1077         enum ip_conntrack_info ctinfo;
1078         struct nf_conn *ct;
1079
1080         ct = nf_ct_get(skb, &ctinfo);
1081
1082         nf_ct_put(ct);
1083         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1084
1085         if (key)
1086                 ovs_ct_fill_key(skb, key, false);
1087
1088         return 0;
1089 }
1090
1091 #if IS_ENABLED(CONFIG_NF_NAT)
1092 static int parse_nat(const struct nlattr *attr,
1093                      struct ovs_conntrack_info *info, bool log)
1094 {
1095         struct nlattr *a;
1096         int rem;
1097         bool have_ip_max = false;
1098         bool have_proto_max = false;
1099         bool ip_vers = (info->family == NFPROTO_IPV6);
1100
1101         nla_for_each_nested(a, attr, rem) {
1102                 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1103                         [OVS_NAT_ATTR_SRC] = {0, 0},
1104                         [OVS_NAT_ATTR_DST] = {0, 0},
1105                         [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1106                                                  sizeof(struct in6_addr)},
1107                         [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1108                                                  sizeof(struct in6_addr)},
1109                         [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1110                         [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1111                         [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1112                         [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1113                         [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1114                 };
1115                 int type = nla_type(a);
1116
1117                 if (type > OVS_NAT_ATTR_MAX) {
1118                         OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
1119                                   type, OVS_NAT_ATTR_MAX);
1120                         return -EINVAL;
1121                 }
1122
1123                 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
1124                         OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
1125                                   type, nla_len(a),
1126                                   ovs_nat_attr_lens[type][ip_vers]);
1127                         return -EINVAL;
1128                 }
1129
1130                 switch (type) {
1131                 case OVS_NAT_ATTR_SRC:
1132                 case OVS_NAT_ATTR_DST:
1133                         if (info->nat) {
1134                                 OVS_NLERR(log, "Only one type of NAT may be specified");
1135                                 return -ERANGE;
1136                         }
1137                         info->nat |= OVS_CT_NAT;
1138                         info->nat |= ((type == OVS_NAT_ATTR_SRC)
1139                                         ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1140                         break;
1141
1142                 case OVS_NAT_ATTR_IP_MIN:
1143                         nla_memcpy(&info->range.min_addr, a,
1144                                    sizeof(info->range.min_addr));
1145                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1146                         break;
1147
1148                 case OVS_NAT_ATTR_IP_MAX:
1149                         have_ip_max = true;
1150                         nla_memcpy(&info->range.max_addr, a,
1151                                    sizeof(info->range.max_addr));
1152                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1153                         break;
1154
1155                 case OVS_NAT_ATTR_PROTO_MIN:
1156                         info->range.min_proto.all = htons(nla_get_u16(a));
1157                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1158                         break;
1159
1160                 case OVS_NAT_ATTR_PROTO_MAX:
1161                         have_proto_max = true;
1162                         info->range.max_proto.all = htons(nla_get_u16(a));
1163                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1164                         break;
1165
1166                 case OVS_NAT_ATTR_PERSISTENT:
1167                         info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1168                         break;
1169
1170                 case OVS_NAT_ATTR_PROTO_HASH:
1171                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1172                         break;
1173
1174                 case OVS_NAT_ATTR_PROTO_RANDOM:
1175                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1176                         break;
1177
1178                 default:
1179                         OVS_NLERR(log, "Unknown nat attribute (%d)", type);
1180                         return -EINVAL;
1181                 }
1182         }
1183
1184         if (rem > 0) {
1185                 OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
1186                 return -EINVAL;
1187         }
1188         if (!info->nat) {
1189                 /* Do not allow flags if no type is given. */
1190                 if (info->range.flags) {
1191                         OVS_NLERR(log,
1192                                   "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1193                                   );
1194                         return -EINVAL;
1195                 }
1196                 info->nat = OVS_CT_NAT;   /* NAT existing connections. */
1197         } else if (!info->commit) {
1198                 OVS_NLERR(log,
1199                           "NAT attributes may be specified only when CT COMMIT flag is also specified."
1200                           );
1201                 return -EINVAL;
1202         }
1203         /* Allow missing IP_MAX. */
1204         if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1205                 memcpy(&info->range.max_addr, &info->range.min_addr,
1206                        sizeof(info->range.max_addr));
1207         }
1208         /* Allow missing PROTO_MAX. */
1209         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1210             !have_proto_max) {
1211                 info->range.max_proto.all = info->range.min_proto.all;
1212         }
1213         return 0;
1214 }
1215 #endif
1216
1217 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1218         [OVS_CT_ATTR_COMMIT]    = { .minlen = 0, .maxlen = 0 },
1219         [OVS_CT_ATTR_FORCE_COMMIT]      = { .minlen = 0, .maxlen = 0 },
1220         [OVS_CT_ATTR_ZONE]      = { .minlen = sizeof(u16),
1221                                     .maxlen = sizeof(u16) },
1222         [OVS_CT_ATTR_MARK]      = { .minlen = sizeof(struct md_mark),
1223                                     .maxlen = sizeof(struct md_mark) },
1224         [OVS_CT_ATTR_LABELS]    = { .minlen = sizeof(struct md_labels),
1225                                     .maxlen = sizeof(struct md_labels) },
1226         [OVS_CT_ATTR_HELPER]    = { .minlen = 1,
1227                                     .maxlen = NF_CT_HELPER_NAME_LEN },
1228 #if IS_ENABLED(CONFIG_NF_NAT)
1229         /* NAT length is checked when parsing the nested attributes. */
1230         [OVS_CT_ATTR_NAT]       = { .minlen = 0, .maxlen = INT_MAX },
1231 #endif
1232         [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
1233                                     .maxlen = sizeof(u32) },
1234         [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
1235                                   .maxlen = CTNL_TIMEOUT_NAME_MAX },
1236 };
1237
1238 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1239                     const char **helper, bool log)
1240 {
1241         struct nlattr *a;
1242         int rem;
1243
1244         nla_for_each_nested(a, attr, rem) {
1245                 int type = nla_type(a);
1246                 int maxlen;
1247                 int minlen;
1248
1249                 if (type > OVS_CT_ATTR_MAX) {
1250                         OVS_NLERR(log,
1251                                   "Unknown conntrack attr (type=%d, max=%d)",
1252                                   type, OVS_CT_ATTR_MAX);
1253                         return -EINVAL;
1254                 }
1255
1256                 maxlen = ovs_ct_attr_lens[type].maxlen;
1257                 minlen = ovs_ct_attr_lens[type].minlen;
1258                 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1259                         OVS_NLERR(log,
1260                                   "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1261                                   type, nla_len(a), maxlen);
1262                         return -EINVAL;
1263                 }
1264
1265                 switch (type) {
1266                 case OVS_CT_ATTR_FORCE_COMMIT:
1267                         info->force = true;
1268                         fallthrough;
1269                 case OVS_CT_ATTR_COMMIT:
1270                         info->commit = true;
1271                         break;
1272 #ifdef CONFIG_NF_CONNTRACK_ZONES
1273                 case OVS_CT_ATTR_ZONE:
1274                         info->zone.id = nla_get_u16(a);
1275                         break;
1276 #endif
1277 #ifdef CONFIG_NF_CONNTRACK_MARK
1278                 case OVS_CT_ATTR_MARK: {
1279                         struct md_mark *mark = nla_data(a);
1280
1281                         if (!mark->mask) {
1282                                 OVS_NLERR(log, "ct_mark mask cannot be 0");
1283                                 return -EINVAL;
1284                         }
1285                         info->mark = *mark;
1286                         break;
1287                 }
1288 #endif
1289 #ifdef CONFIG_NF_CONNTRACK_LABELS
1290                 case OVS_CT_ATTR_LABELS: {
1291                         struct md_labels *labels = nla_data(a);
1292
1293                         if (!labels_nonzero(&labels->mask)) {
1294                                 OVS_NLERR(log, "ct_labels mask cannot be 0");
1295                                 return -EINVAL;
1296                         }
1297                         info->labels = *labels;
1298                         break;
1299                 }
1300 #endif
1301                 case OVS_CT_ATTR_HELPER:
1302                         *helper = nla_data(a);
1303                         if (!string_is_terminated(*helper, nla_len(a))) {
1304                                 OVS_NLERR(log, "Invalid conntrack helper");
1305                                 return -EINVAL;
1306                         }
1307                         break;
1308 #if IS_ENABLED(CONFIG_NF_NAT)
1309                 case OVS_CT_ATTR_NAT: {
1310                         int err = parse_nat(a, info, log);
1311
1312                         if (err)
1313                                 return err;
1314                         break;
1315                 }
1316 #endif
1317                 case OVS_CT_ATTR_EVENTMASK:
1318                         info->have_eventmask = true;
1319                         info->eventmask = nla_get_u32(a);
1320                         break;
1321 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1322                 case OVS_CT_ATTR_TIMEOUT:
1323                         memcpy(info->timeout, nla_data(a), nla_len(a));
1324                         if (!string_is_terminated(info->timeout, nla_len(a))) {
1325                                 OVS_NLERR(log, "Invalid conntrack timeout");
1326                                 return -EINVAL;
1327                         }
1328                         break;
1329 #endif
1330
1331                 default:
1332                         OVS_NLERR(log, "Unknown conntrack attr (%d)",
1333                                   type);
1334                         return -EINVAL;
1335                 }
1336         }
1337
1338 #ifdef CONFIG_NF_CONNTRACK_MARK
1339         if (!info->commit && info->mark.mask) {
1340                 OVS_NLERR(log,
1341                           "Setting conntrack mark requires 'commit' flag.");
1342                 return -EINVAL;
1343         }
1344 #endif
1345 #ifdef CONFIG_NF_CONNTRACK_LABELS
1346         if (!info->commit && labels_nonzero(&info->labels.mask)) {
1347                 OVS_NLERR(log,
1348                           "Setting conntrack labels requires 'commit' flag.");
1349                 return -EINVAL;
1350         }
1351 #endif
1352         if (rem > 0) {
1353                 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1354                 return -EINVAL;
1355         }
1356
1357         return 0;
1358 }
1359
1360 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1361 {
1362         if (attr == OVS_KEY_ATTR_CT_STATE)
1363                 return true;
1364         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1365             attr == OVS_KEY_ATTR_CT_ZONE)
1366                 return true;
1367         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1368             attr == OVS_KEY_ATTR_CT_MARK)
1369                 return true;
1370         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1371             attr == OVS_KEY_ATTR_CT_LABELS)
1372                 return true;
1373
1374         return false;
1375 }
1376
1377 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1378                        const struct sw_flow_key *key,
1379                        struct sw_flow_actions **sfa,  bool log)
1380 {
1381         unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1382         struct ovs_conntrack_info ct_info;
1383         const char *helper = NULL;
1384         u16 family;
1385         int err;
1386
1387         family = key_to_nfproto(key);
1388         if (family == NFPROTO_UNSPEC) {
1389                 OVS_NLERR(log, "ct family unspecified");
1390                 return -EINVAL;
1391         }
1392
1393         memset(&ct_info, 0, sizeof(ct_info));
1394         ct_info.family = family;
1395
1396         nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1397                         NF_CT_DEFAULT_ZONE_DIR, 0);
1398
1399         err = parse_ct(attr, &ct_info, &helper, log);
1400         if (err)
1401                 return err;
1402
1403         /* Set up template for tracking connections in specific zones. */
1404         ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1405         if (!ct_info.ct) {
1406                 OVS_NLERR(log, "Failed to allocate conntrack template");
1407                 return -ENOMEM;
1408         }
1409
1410         if (nf_connlabels_get(net, n_bits - 1)) {
1411                 nf_ct_tmpl_free(ct_info.ct);
1412                 OVS_NLERR(log, "Failed to set connlabel length");
1413                 return -EOPNOTSUPP;
1414         }
1415
1416         if (ct_info.timeout[0]) {
1417                 if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
1418                                       ct_info.timeout))
1419                         OVS_NLERR(log,
1420                                   "Failed to associated timeout policy '%s'",
1421                                   ct_info.timeout);
1422                 else
1423                         ct_info.nf_ct_timeout = rcu_dereference(
1424                                 nf_ct_timeout_find(ct_info.ct)->timeout);
1425
1426         }
1427
1428         if (helper) {
1429                 err = nf_ct_add_helper(ct_info.ct, helper, ct_info.family,
1430                                        key->ip.proto, ct_info.nat, &ct_info.helper);
1431                 if (err) {
1432                         OVS_NLERR(log, "Failed to add %s helper %d", helper, err);
1433                         goto err_free_ct;
1434                 }
1435         }
1436
1437         err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1438                                  sizeof(ct_info), log);
1439         if (err)
1440                 goto err_free_ct;
1441
1442         if (ct_info.commit)
1443                 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1444         return 0;
1445 err_free_ct:
1446         __ovs_ct_free_action(&ct_info);
1447         return err;
1448 }
1449
1450 #if IS_ENABLED(CONFIG_NF_NAT)
1451 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1452                                struct sk_buff *skb)
1453 {
1454         struct nlattr *start;
1455
1456         start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT);
1457         if (!start)
1458                 return false;
1459
1460         if (info->nat & OVS_CT_SRC_NAT) {
1461                 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1462                         return false;
1463         } else if (info->nat & OVS_CT_DST_NAT) {
1464                 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1465                         return false;
1466         } else {
1467                 goto out;
1468         }
1469
1470         if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1471                 if (IS_ENABLED(CONFIG_NF_NAT) &&
1472                     info->family == NFPROTO_IPV4) {
1473                         if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1474                                             info->range.min_addr.ip) ||
1475                             (info->range.max_addr.ip
1476                              != info->range.min_addr.ip &&
1477                              (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1478                                               info->range.max_addr.ip))))
1479                                 return false;
1480                 } else if (IS_ENABLED(CONFIG_IPV6) &&
1481                            info->family == NFPROTO_IPV6) {
1482                         if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1483                                              &info->range.min_addr.in6) ||
1484                             (memcmp(&info->range.max_addr.in6,
1485                                     &info->range.min_addr.in6,
1486                                     sizeof(info->range.max_addr.in6)) &&
1487                              (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1488                                                &info->range.max_addr.in6))))
1489                                 return false;
1490                 } else {
1491                         return false;
1492                 }
1493         }
1494         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1495             (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1496                          ntohs(info->range.min_proto.all)) ||
1497              (info->range.max_proto.all != info->range.min_proto.all &&
1498               nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1499                           ntohs(info->range.max_proto.all)))))
1500                 return false;
1501
1502         if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1503             nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1504                 return false;
1505         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1506             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1507                 return false;
1508         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1509             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1510                 return false;
1511 out:
1512         nla_nest_end(skb, start);
1513
1514         return true;
1515 }
1516 #endif
1517
1518 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1519                           struct sk_buff *skb)
1520 {
1521         struct nlattr *start;
1522
1523         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT);
1524         if (!start)
1525                 return -EMSGSIZE;
1526
1527         if (ct_info->commit && nla_put_flag(skb, ct_info->force
1528                                             ? OVS_CT_ATTR_FORCE_COMMIT
1529                                             : OVS_CT_ATTR_COMMIT))
1530                 return -EMSGSIZE;
1531         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1532             nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1533                 return -EMSGSIZE;
1534         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1535             nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1536                     &ct_info->mark))
1537                 return -EMSGSIZE;
1538         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1539             labels_nonzero(&ct_info->labels.mask) &&
1540             nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1541                     &ct_info->labels))
1542                 return -EMSGSIZE;
1543         if (ct_info->helper) {
1544                 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1545                                    ct_info->helper->name))
1546                         return -EMSGSIZE;
1547         }
1548         if (ct_info->have_eventmask &&
1549             nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
1550                 return -EMSGSIZE;
1551         if (ct_info->timeout[0]) {
1552                 if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout))
1553                         return -EMSGSIZE;
1554         }
1555
1556 #if IS_ENABLED(CONFIG_NF_NAT)
1557         if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1558                 return -EMSGSIZE;
1559 #endif
1560         nla_nest_end(skb, start);
1561
1562         return 0;
1563 }
1564
1565 void ovs_ct_free_action(const struct nlattr *a)
1566 {
1567         struct ovs_conntrack_info *ct_info = nla_data(a);
1568
1569         __ovs_ct_free_action(ct_info);
1570 }
1571
1572 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1573 {
1574         if (ct_info->helper) {
1575 #if IS_ENABLED(CONFIG_NF_NAT)
1576                 if (ct_info->nat)
1577                         nf_nat_helper_put(ct_info->helper);
1578 #endif
1579                 nf_conntrack_helper_put(ct_info->helper);
1580         }
1581         if (ct_info->ct) {
1582                 if (ct_info->timeout[0])
1583                         nf_ct_destroy_timeout(ct_info->ct);
1584                 nf_connlabels_put(nf_ct_net(ct_info->ct));
1585                 nf_ct_tmpl_free(ct_info->ct);
1586         }
1587 }
1588
1589 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1590 static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
1591 {
1592         int i, err;
1593
1594         ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
1595                                          GFP_KERNEL);
1596         if (!ovs_net->ct_limit_info)
1597                 return -ENOMEM;
1598
1599         ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
1600         ovs_net->ct_limit_info->limits =
1601                 kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
1602                               GFP_KERNEL);
1603         if (!ovs_net->ct_limit_info->limits) {
1604                 kfree(ovs_net->ct_limit_info);
1605                 return -ENOMEM;
1606         }
1607
1608         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
1609                 INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
1610
1611         ovs_net->ct_limit_info->data = nf_conncount_init(net, sizeof(u32));
1612
1613         if (IS_ERR(ovs_net->ct_limit_info->data)) {
1614                 err = PTR_ERR(ovs_net->ct_limit_info->data);
1615                 kfree(ovs_net->ct_limit_info->limits);
1616                 kfree(ovs_net->ct_limit_info);
1617                 pr_err("openvswitch: failed to init nf_conncount %d\n", err);
1618                 return err;
1619         }
1620         return 0;
1621 }
1622
1623 static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
1624 {
1625         const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
1626         int i;
1627
1628         nf_conncount_destroy(net, info->data);
1629         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1630                 struct hlist_head *head = &info->limits[i];
1631                 struct ovs_ct_limit *ct_limit;
1632                 struct hlist_node *next;
1633
1634                 hlist_for_each_entry_safe(ct_limit, next, head, hlist_node)
1635                         kfree_rcu(ct_limit, rcu);
1636         }
1637         kfree(info->limits);
1638         kfree(info);
1639 }
1640
1641 static struct sk_buff *
1642 ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
1643                              struct ovs_header **ovs_reply_header)
1644 {
1645         struct ovs_header *ovs_header = genl_info_userhdr(info);
1646         struct sk_buff *skb;
1647
1648         skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1649         if (!skb)
1650                 return ERR_PTR(-ENOMEM);
1651
1652         *ovs_reply_header = genlmsg_put(skb, info->snd_portid,
1653                                         info->snd_seq,
1654                                         &dp_ct_limit_genl_family, 0, cmd);
1655
1656         if (!*ovs_reply_header) {
1657                 nlmsg_free(skb);
1658                 return ERR_PTR(-EMSGSIZE);
1659         }
1660         (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
1661
1662         return skb;
1663 }
1664
1665 static bool check_zone_id(int zone_id, u16 *pzone)
1666 {
1667         if (zone_id >= 0 && zone_id <= 65535) {
1668                 *pzone = (u16)zone_id;
1669                 return true;
1670         }
1671         return false;
1672 }
1673
1674 static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
1675                                        struct ovs_ct_limit_info *info)
1676 {
1677         struct ovs_zone_limit *zone_limit;
1678         int rem;
1679         u16 zone;
1680
1681         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1682         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1683
1684         while (rem >= sizeof(*zone_limit)) {
1685                 if (unlikely(zone_limit->zone_id ==
1686                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1687                         ovs_lock();
1688                         info->default_limit = zone_limit->limit;
1689                         ovs_unlock();
1690                 } else if (unlikely(!check_zone_id(
1691                                 zone_limit->zone_id, &zone))) {
1692                         OVS_NLERR(true, "zone id is out of range");
1693                 } else {
1694                         struct ovs_ct_limit *ct_limit;
1695
1696                         ct_limit = kmalloc(sizeof(*ct_limit),
1697                                            GFP_KERNEL_ACCOUNT);
1698                         if (!ct_limit)
1699                                 return -ENOMEM;
1700
1701                         ct_limit->zone = zone;
1702                         ct_limit->limit = zone_limit->limit;
1703
1704                         ovs_lock();
1705                         ct_limit_set(info, ct_limit);
1706                         ovs_unlock();
1707                 }
1708                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1709                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1710                                 NLA_ALIGN(sizeof(*zone_limit)));
1711         }
1712
1713         if (rem)
1714                 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
1715
1716         return 0;
1717 }
1718
1719 static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
1720                                        struct ovs_ct_limit_info *info)
1721 {
1722         struct ovs_zone_limit *zone_limit;
1723         int rem;
1724         u16 zone;
1725
1726         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1727         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1728
1729         while (rem >= sizeof(*zone_limit)) {
1730                 if (unlikely(zone_limit->zone_id ==
1731                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1732                         ovs_lock();
1733                         info->default_limit = OVS_CT_LIMIT_DEFAULT;
1734                         ovs_unlock();
1735                 } else if (unlikely(!check_zone_id(
1736                                 zone_limit->zone_id, &zone))) {
1737                         OVS_NLERR(true, "zone id is out of range");
1738                 } else {
1739                         ovs_lock();
1740                         ct_limit_del(info, zone);
1741                         ovs_unlock();
1742                 }
1743                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1744                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1745                                 NLA_ALIGN(sizeof(*zone_limit)));
1746         }
1747
1748         if (rem)
1749                 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
1750
1751         return 0;
1752 }
1753
1754 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
1755                                           struct sk_buff *reply)
1756 {
1757         struct ovs_zone_limit zone_limit = {
1758                 .zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE,
1759                 .limit   = info->default_limit,
1760         };
1761
1762         return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1763 }
1764
1765 static int __ovs_ct_limit_get_zone_limit(struct net *net,
1766                                          struct nf_conncount_data *data,
1767                                          u16 zone_id, u32 limit,
1768                                          struct sk_buff *reply)
1769 {
1770         struct nf_conntrack_zone ct_zone;
1771         struct ovs_zone_limit zone_limit;
1772         u32 conncount_key = zone_id;
1773
1774         zone_limit.zone_id = zone_id;
1775         zone_limit.limit = limit;
1776         nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
1777
1778         zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
1779                                               &ct_zone);
1780         return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1781 }
1782
1783 static int ovs_ct_limit_get_zone_limit(struct net *net,
1784                                        struct nlattr *nla_zone_limit,
1785                                        struct ovs_ct_limit_info *info,
1786                                        struct sk_buff *reply)
1787 {
1788         struct ovs_zone_limit *zone_limit;
1789         int rem, err;
1790         u32 limit;
1791         u16 zone;
1792
1793         rem = NLA_ALIGN(nla_len(nla_zone_limit));
1794         zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1795
1796         while (rem >= sizeof(*zone_limit)) {
1797                 if (unlikely(zone_limit->zone_id ==
1798                                 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1799                         err = ovs_ct_limit_get_default_limit(info, reply);
1800                         if (err)
1801                                 return err;
1802                 } else if (unlikely(!check_zone_id(zone_limit->zone_id,
1803                                                         &zone))) {
1804                         OVS_NLERR(true, "zone id is out of range");
1805                 } else {
1806                         rcu_read_lock();
1807                         limit = ct_limit_get(info, zone);
1808                         rcu_read_unlock();
1809
1810                         err = __ovs_ct_limit_get_zone_limit(
1811                                 net, info->data, zone, limit, reply);
1812                         if (err)
1813                                 return err;
1814                 }
1815                 rem -= NLA_ALIGN(sizeof(*zone_limit));
1816                 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1817                                 NLA_ALIGN(sizeof(*zone_limit)));
1818         }
1819
1820         if (rem)
1821                 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
1822
1823         return 0;
1824 }
1825
1826 static int ovs_ct_limit_get_all_zone_limit(struct net *net,
1827                                            struct ovs_ct_limit_info *info,
1828                                            struct sk_buff *reply)
1829 {
1830         struct ovs_ct_limit *ct_limit;
1831         struct hlist_head *head;
1832         int i, err = 0;
1833
1834         err = ovs_ct_limit_get_default_limit(info, reply);
1835         if (err)
1836                 return err;
1837
1838         rcu_read_lock();
1839         for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1840                 head = &info->limits[i];
1841                 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1842                         err = __ovs_ct_limit_get_zone_limit(net, info->data,
1843                                 ct_limit->zone, ct_limit->limit, reply);
1844                         if (err)
1845                                 goto exit_err;
1846                 }
1847         }
1848
1849 exit_err:
1850         rcu_read_unlock();
1851         return err;
1852 }
1853
1854 static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
1855 {
1856         struct nlattr **a = info->attrs;
1857         struct sk_buff *reply;
1858         struct ovs_header *ovs_reply_header;
1859         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1860         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1861         int err;
1862
1863         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
1864                                              &ovs_reply_header);
1865         if (IS_ERR(reply))
1866                 return PTR_ERR(reply);
1867
1868         if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1869                 err = -EINVAL;
1870                 goto exit_err;
1871         }
1872
1873         err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1874                                           ct_limit_info);
1875         if (err)
1876                 goto exit_err;
1877
1878         static_branch_enable(&ovs_ct_limit_enabled);
1879
1880         genlmsg_end(reply, ovs_reply_header);
1881         return genlmsg_reply(reply, info);
1882
1883 exit_err:
1884         nlmsg_free(reply);
1885         return err;
1886 }
1887
1888 static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
1889 {
1890         struct nlattr **a = info->attrs;
1891         struct sk_buff *reply;
1892         struct ovs_header *ovs_reply_header;
1893         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1894         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1895         int err;
1896
1897         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
1898                                              &ovs_reply_header);
1899         if (IS_ERR(reply))
1900                 return PTR_ERR(reply);
1901
1902         if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1903                 err = -EINVAL;
1904                 goto exit_err;
1905         }
1906
1907         err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1908                                           ct_limit_info);
1909         if (err)
1910                 goto exit_err;
1911
1912         genlmsg_end(reply, ovs_reply_header);
1913         return genlmsg_reply(reply, info);
1914
1915 exit_err:
1916         nlmsg_free(reply);
1917         return err;
1918 }
1919
1920 static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
1921 {
1922         struct nlattr **a = info->attrs;
1923         struct nlattr *nla_reply;
1924         struct sk_buff *reply;
1925         struct ovs_header *ovs_reply_header;
1926         struct net *net = sock_net(skb->sk);
1927         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1928         struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1929         int err;
1930
1931         reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
1932                                              &ovs_reply_header);
1933         if (IS_ERR(reply))
1934                 return PTR_ERR(reply);
1935
1936         nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
1937         if (!nla_reply) {
1938                 err = -EMSGSIZE;
1939                 goto exit_err;
1940         }
1941
1942         if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1943                 err = ovs_ct_limit_get_zone_limit(
1944                         net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
1945                         reply);
1946                 if (err)
1947                         goto exit_err;
1948         } else {
1949                 err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
1950                                                       reply);
1951                 if (err)
1952                         goto exit_err;
1953         }
1954
1955         nla_nest_end(reply, nla_reply);
1956         genlmsg_end(reply, ovs_reply_header);
1957         return genlmsg_reply(reply, info);
1958
1959 exit_err:
1960         nlmsg_free(reply);
1961         return err;
1962 }
1963
1964 static const struct genl_small_ops ct_limit_genl_ops[] = {
1965         { .cmd = OVS_CT_LIMIT_CMD_SET,
1966                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1967                 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1968                                                * privilege.
1969                                                */
1970                 .doit = ovs_ct_limit_cmd_set,
1971         },
1972         { .cmd = OVS_CT_LIMIT_CMD_DEL,
1973                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1974                 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1975                                                * privilege.
1976                                                */
1977                 .doit = ovs_ct_limit_cmd_del,
1978         },
1979         { .cmd = OVS_CT_LIMIT_CMD_GET,
1980                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1981                 .flags = 0,               /* OK for unprivileged users. */
1982                 .doit = ovs_ct_limit_cmd_get,
1983         },
1984 };
1985
1986 static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
1987         .name = OVS_CT_LIMIT_MCGROUP,
1988 };
1989
1990 struct genl_family dp_ct_limit_genl_family __ro_after_init = {
1991         .hdrsize = sizeof(struct ovs_header),
1992         .name = OVS_CT_LIMIT_FAMILY,
1993         .version = OVS_CT_LIMIT_VERSION,
1994         .maxattr = OVS_CT_LIMIT_ATTR_MAX,
1995         .policy = ct_limit_policy,
1996         .netnsok = true,
1997         .parallel_ops = true,
1998         .small_ops = ct_limit_genl_ops,
1999         .n_small_ops = ARRAY_SIZE(ct_limit_genl_ops),
2000         .resv_start_op = OVS_CT_LIMIT_CMD_GET + 1,
2001         .mcgrps = &ovs_ct_limit_multicast_group,
2002         .n_mcgrps = 1,
2003         .module = THIS_MODULE,
2004 };
2005 #endif
2006
2007 int ovs_ct_init(struct net *net)
2008 {
2009 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2010         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2011
2012         return ovs_ct_limit_init(net, ovs_net);
2013 #else
2014         return 0;
2015 #endif
2016 }
2017
2018 void ovs_ct_exit(struct net *net)
2019 {
2020 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2021         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2022
2023         ovs_ct_limit_exit(net, ovs_net);
2024 #endif
2025 }