net/sched/act_tunnel_key.c

   1 /*
   2  * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
   3  * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/geneve.h>
  17 #include <net/netlink.h>
  18 #include <net/pkt_sched.h>
  19 #include <net/dst.h>
  20
  21 #include <linux/tc_act/tc_tunnel_key.h>
  22 #include <net/tc_act/tc_tunnel_key.h>
  23
  24 static unsigned int tunnel_key_net_id;
  25 static struct tc_action_ops act_tunnel_key_ops;
  26
  27 static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
  28                           struct tcf_result *res)
  29 {
  30         struct tcf_tunnel_key *t = to_tunnel_key(a);
  31         struct tcf_tunnel_key_params *params;
  32         int action;
  33
  34         params = rcu_dereference_bh(t->params);
  35
  36         tcf_lastuse_update(&t->tcf_tm);
  37         bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
  38         action = READ_ONCE(t->tcf_action);
  39
  40         switch (params->tcft_action) {
  41         case TCA_TUNNEL_KEY_ACT_RELEASE:
  42                 skb_dst_drop(skb);
  43                 break;
  44         case TCA_TUNNEL_KEY_ACT_SET:
  45                 skb_dst_drop(skb);
  46                 skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
  47                 break;
  48         default:
  49                 WARN_ONCE(1, "Bad tunnel_key action %d.\n",
  50                           params->tcft_action);
  51                 break;
  52         }
  53
  54         return action;
  55 }
  56
  57 static const struct nla_policy
  58 enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
  59         [TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]        = { .type = NLA_NESTED },
  60 };
  61
  62 static const struct nla_policy
  63 geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
  64         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]      = { .type = NLA_U16 },
  65         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]       = { .type = NLA_U8 },
  66         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]       = { .type = NLA_BINARY,
  67                                                        .len = 128 },
  68 };
  69
  70 static int
  71 tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
  72                            struct netlink_ext_ack *extack)
  73 {
  74         struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
  75         int err, data_len, opt_len;
  76         u8 *data;
  77
  78         err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
  79                                nla, geneve_opt_policy, extack);
  80         if (err < 0)
  81                 return err;
  82
  83         if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
  84             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
  85             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
  86                 NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
  87                 return -EINVAL;
  88         }
  89
  90         data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  91         data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  92         if (data_len < 4) {
  93                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
  94                 return -ERANGE;
  95         }
  96         if (data_len % 4) {
  97                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
  98                 return -ERANGE;
  99         }
 100
 101         opt_len = sizeof(struct geneve_opt) + data_len;
 102         if (dst) {
 103                 struct geneve_opt *opt = dst;
 104
 105                 WARN_ON(dst_len < opt_len);
 106
 107                 opt->opt_class =
 108                         nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
 109                 opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
 110                 opt->length = data_len / 4; /* length is in units of 4 bytes */
 111                 opt->r1 = 0;
 112                 opt->r2 = 0;
 113                 opt->r3 = 0;
 114
 115                 memcpy(opt + 1, data, data_len);
 116         }
 117
 118         return opt_len;
 119 }
 120
 121 static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
 122                                 int dst_len, struct netlink_ext_ack *extack)
 123 {
 124         int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
 125         const struct nlattr *attr, *head = nla_data(nla);
 126
 127         err = nla_validate(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
 128                            enc_opts_policy, extack);
 129         if (err)
 130                 return err;
 131
 132         nla_for_each_attr(attr, head, len, rem) {
 133                 switch (nla_type(attr)) {
 134                 case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 135                         opt_len = tunnel_key_copy_geneve_opt(attr, dst,
 136                                                              dst_len, extack);
 137                         if (opt_len < 0)
 138                                 return opt_len;
 139                         opts_len += opt_len;
 140                         if (opts_len > IP_TUNNEL_OPTS_MAX) {
 141                                 NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
 142                                 return -EINVAL;
 143                         }
 144                         if (dst) {
 145                                 dst_len -= opt_len;
 146                                 dst += opt_len;
 147                         }
 148                         break;
 149                 }
 150         }
 151
 152         if (!opts_len) {
 153                 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 154                 return -EINVAL;
 155         }
 156
 157         if (rem > 0) {
 158                 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 159                 return -EINVAL;
 160         }
 161
 162         return opts_len;
 163 }
 164
 165 static int tunnel_key_get_opts_len(struct nlattr *nla,
 166                                    struct netlink_ext_ack *extack)
 167 {
 168         return tunnel_key_copy_opts(nla, NULL, 0, extack);
 169 }
 170
 171 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 172                                int opts_len, struct netlink_ext_ack *extack)
 173 {
 174         info->options_len = opts_len;
 175         switch (nla_type(nla_data(nla))) {
 176         case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 177 #if IS_ENABLED(CONFIG_INET)
 178                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 179                 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 180                                             opts_len, extack);
 181 #else
 182                 return -EAFNOSUPPORT;
 183 #endif
 184         default:
 185                 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 186                 return -EINVAL;
 187         }
 188 }
 189
 190 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 191         [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 192         [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 193         [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 194         [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 195         [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 196         [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 197         [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 198         [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 199         [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 200         [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 201         [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 202 };
 203
 204 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 205 {
 206         if (!p)
 207                 return;
 208         if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 209                 dst_release(&p->tcft_enc_metadata->dst);
 210         kfree_rcu(p, rcu);
 211 }
 212
 213 static int tunnel_key_init(struct net *net, struct nlattr *nla,
 214                            struct nlattr *est, struct tc_action **a,
 215                            int ovr, int bind, bool rtnl_held,
 216                            struct netlink_ext_ack *extack)
 217 {
 218         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 219         struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
 220         struct tcf_tunnel_key_params *params_new;
 221         struct metadata_dst *metadata = NULL;
 222         struct tc_tunnel_key *parm;
 223         struct tcf_tunnel_key *t;
 224         bool exists = false;
 225         __be16 dst_port = 0;
 226         int opts_len = 0;
 227         __be64 key_id;
 228         __be16 flags;
 229         u8 tos, ttl;
 230         int ret = 0;
 231         u32 index;
 232         int err;
 233
 234         if (!nla) {
 235                 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 236                 return -EINVAL;
 237         }
 238
 239         err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
 240                                extack);
 241         if (err < 0) {
 242                 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 243                 return err;
 244         }
 245
 246         if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 247                 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 248                 return -EINVAL;
 249         }
 250
 251         parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 252         index = parm->index;
 253         err = tcf_idr_check_alloc(tn, &index, a, bind);
 254         if (err < 0)
 255                 return err;
 256         exists = err;
 257         if (exists && bind)
 258                 return 0;
 259
 260         switch (parm->t_action) {
 261         case TCA_TUNNEL_KEY_ACT_RELEASE:
 262                 break;
 263         case TCA_TUNNEL_KEY_ACT_SET:
 264                 if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 265                         NL_SET_ERR_MSG(extack, "Missing tunnel key id");
 266                         ret = -EINVAL;
 267                         goto err_out;
 268                 }
 269
 270                 key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
 271
 272                 flags = TUNNEL_KEY | TUNNEL_CSUM;
 273                 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 274                     nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 275                         flags &= ~TUNNEL_CSUM;
 276
 277                 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 278                         dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 279
 280                 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 281                         opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 282                                                            extack);
 283                         if (opts_len < 0) {
 284                                 ret = opts_len;
 285                                 goto err_out;
 286                         }
 287                 }
 288
 289                 tos = 0;
 290                 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 291                         tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 292                 ttl = 0;
 293                 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 294                         ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 295
 296                 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 297                     tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 298                         __be32 saddr;
 299                         __be32 daddr;
 300
 301                         saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 302                         daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 303
 304                         metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 305                                                     dst_port, flags,
 306                                                     key_id, opts_len);
 307                 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 308                            tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 309                         struct in6_addr saddr;
 310                         struct in6_addr daddr;
 311
 312                         saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 313                         daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 314
 315                         metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 316                                                       0, flags,
 317                                                       key_id, 0);
 318                 } else {
 319                         NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 320                         ret = -EINVAL;
 321                         goto err_out;
 322                 }
 323
 324                 if (!metadata) {
 325                         NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 326                         ret = -ENOMEM;
 327                         goto err_out;
 328                 }
 329
 330                 if (opts_len) {
 331                         ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 332                                                   &metadata->u.tun_info,
 333                                                   opts_len, extack);
 334                         if (ret < 0)
 335                                 goto release_tun_meta;
 336                 }
 337
 338                 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 339                 break;
 340         default:
 341                 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 342                 ret = -EINVAL;
 343                 goto err_out;
 344         }
 345
 346         if (!exists) {
 347                 ret = tcf_idr_create(tn, index, est, a,
 348                                      &act_tunnel_key_ops, bind, true);
 349                 if (ret) {
 350                         NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
 351                         goto release_tun_meta;
 352                 }
 353
 354                 ret = ACT_P_CREATED;
 355         } else if (!ovr) {
 356                 NL_SET_ERR_MSG(extack, "TC IDR already exists");
 357                 ret = -EEXIST;
 358                 goto release_tun_meta;
 359         }
 360
 361         t = to_tunnel_key(*a);
 362
 363         params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 364         if (unlikely(!params_new)) {
 365                 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
 366                 ret = -ENOMEM;
 367                 exists = true;
 368                 goto release_tun_meta;
 369         }
 370         params_new->tcft_action = parm->t_action;
 371         params_new->tcft_enc_metadata = metadata;
 372
 373         spin_lock_bh(&t->tcf_lock);
 374         t->tcf_action = parm->action;
 375         rcu_swap_protected(t->params, params_new,
 376                            lockdep_is_held(&t->tcf_lock));
 377         spin_unlock_bh(&t->tcf_lock);
 378         tunnel_key_release_params(params_new);
 379
 380         if (ret == ACT_P_CREATED)
 381                 tcf_idr_insert(tn, *a);
 382
 383         return ret;
 384
 385 release_tun_meta:
 386         if (metadata)
 387                 dst_release(&metadata->dst);
 388
 389 err_out:
 390         if (exists)
 391                 tcf_idr_release(*a, bind);
 392         else
 393                 tcf_idr_cleanup(tn, index);
 394         return ret;
 395 }
 396
 397 static void tunnel_key_release(struct tc_action *a)
 398 {
 399         struct tcf_tunnel_key *t = to_tunnel_key(a);
 400         struct tcf_tunnel_key_params *params;
 401
 402         params = rcu_dereference_protected(t->params, 1);
 403         tunnel_key_release_params(params);
 404 }
 405
 406 static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
 407                                        const struct ip_tunnel_info *info)
 408 {
 409         int len = info->options_len;
 410         u8 *src = (u8 *)(info + 1);
 411         struct nlattr *start;
 412
 413         start = nla_nest_start(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
 414         if (!start)
 415                 return -EMSGSIZE;
 416
 417         while (len > 0) {
 418                 struct geneve_opt *opt = (struct geneve_opt *)src;
 419
 420                 if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
 421                                  opt->opt_class) ||
 422                     nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
 423                                opt->type) ||
 424                     nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
 425                             opt->length * 4, opt + 1)) {
 426                         nla_nest_cancel(skb, start);
 427                         return -EMSGSIZE;
 428                 }
 429
 430                 len -= sizeof(struct geneve_opt) + opt->length * 4;
 431                 src += sizeof(struct geneve_opt) + opt->length * 4;
 432         }
 433
 434         nla_nest_end(skb, start);
 435         return 0;
 436 }
 437
 438 static int tunnel_key_opts_dump(struct sk_buff *skb,
 439                                 const struct ip_tunnel_info *info)
 440 {
 441         struct nlattr *start;
 442         int err = -EINVAL;
 443
 444         if (!info->options_len)
 445                 return 0;
 446
 447         start = nla_nest_start(skb, TCA_TUNNEL_KEY_ENC_OPTS);
 448         if (!start)
 449                 return -EMSGSIZE;
 450
 451         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 452                 err = tunnel_key_geneve_opts_dump(skb, info);
 453                 if (err)
 454                         goto err_out;
 455         } else {
 456 err_out:
 457                 nla_nest_cancel(skb, start);
 458                 return err;
 459         }
 460
 461         nla_nest_end(skb, start);
 462         return 0;
 463 }
 464
 465 static int tunnel_key_dump_addresses(struct sk_buff *skb,
 466                                      const struct ip_tunnel_info *info)
 467 {
 468         unsigned short family = ip_tunnel_info_af(info);
 469
 470         if (family == AF_INET) {
 471                 __be32 saddr = info->key.u.ipv4.src;
 472                 __be32 daddr = info->key.u.ipv4.dst;
 473
 474                 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
 475                     !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
 476                         return 0;
 477         }
 478
 479         if (family == AF_INET6) {
 480                 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
 481                 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
 482
 483                 if (!nla_put_in6_addr(skb,
 484                                       TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
 485                     !nla_put_in6_addr(skb,
 486                                       TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
 487                         return 0;
 488         }
 489
 490         return -EINVAL;
 491 }
 492
 493 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 494                            int bind, int ref)
 495 {
 496         unsigned char *b = skb_tail_pointer(skb);
 497         struct tcf_tunnel_key *t = to_tunnel_key(a);
 498         struct tcf_tunnel_key_params *params;
 499         struct tc_tunnel_key opt = {
 500                 .index    = t->tcf_index,
 501                 .refcnt   = refcount_read(&t->tcf_refcnt) - ref,
 502                 .bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
 503         };
 504         struct tcf_t tm;
 505
 506         spin_lock_bh(&t->tcf_lock);
 507         params = rcu_dereference_protected(t->params,
 508                                            lockdep_is_held(&t->tcf_lock));
 509         opt.action   = t->tcf_action;
 510         opt.t_action = params->tcft_action;
 511
 512         if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
 513                 goto nla_put_failure;
 514
 515         if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
 516                 struct ip_tunnel_info *info =
 517                         &params->tcft_enc_metadata->u.tun_info;
 518                 struct ip_tunnel_key *key = &info->key;
 519                 __be32 key_id = tunnel_id_to_key32(key->tun_id);
 520
 521                 if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
 522                     tunnel_key_dump_addresses(skb,
 523                                               &params->tcft_enc_metadata->u.tun_info) ||
 524                     nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
 525                     nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 526                                !(key->tun_flags & TUNNEL_CSUM)) ||
 527                     tunnel_key_opts_dump(skb, info))
 528                         goto nla_put_failure;
 529
 530                 if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
 531                         goto nla_put_failure;
 532
 533                 if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
 534                         goto nla_put_failure;
 535         }
 536
 537         tcf_tm_dump(&tm, &t->tcf_tm);
 538         if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
 539                           &tm, TCA_TUNNEL_KEY_PAD))
 540                 goto nla_put_failure;
 541         spin_unlock_bh(&t->tcf_lock);
 542
 543         return skb->len;
 544
 545 nla_put_failure:
 546         spin_unlock_bh(&t->tcf_lock);
 547         nlmsg_trim(skb, b);
 548         return -1;
 549 }
 550
 551 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
 552                              struct netlink_callback *cb, int type,
 553                              const struct tc_action_ops *ops,
 554                              struct netlink_ext_ack *extack)
 555 {
 556         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 557
 558         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 559 }
 560
 561 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index,
 562                              struct netlink_ext_ack *extack)
 563 {
 564         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 565
 566         return tcf_idr_search(tn, a, index);
 567 }
 568
 569 static struct tc_action_ops act_tunnel_key_ops = {
 570         .kind           =       "tunnel_key",
 571         .type           =       TCA_ACT_TUNNEL_KEY,
 572         .owner          =       THIS_MODULE,
 573         .act            =       tunnel_key_act,
 574         .dump           =       tunnel_key_dump,
 575         .init           =       tunnel_key_init,
 576         .cleanup        =       tunnel_key_release,
 577         .walk           =       tunnel_key_walker,
 578         .lookup         =       tunnel_key_search,
 579         .size           =       sizeof(struct tcf_tunnel_key),
 580 };
 581
 582 static __net_init int tunnel_key_init_net(struct net *net)
 583 {
 584         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 585
 586         return tc_action_net_init(net, tn, &act_tunnel_key_ops);
 587 }
 588
 589 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
 590 {
 591         tc_action_net_exit(net_list, tunnel_key_net_id);
 592 }
 593
 594 static struct pernet_operations tunnel_key_net_ops = {
 595         .init = tunnel_key_init_net,
 596         .exit_batch = tunnel_key_exit_net,
 597         .id   = &tunnel_key_net_id,
 598         .size = sizeof(struct tc_action_net),
 599 };
 600
 601 static int __init tunnel_key_init_module(void)
 602 {
 603         return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 604 }
 605
 606 static void __exit tunnel_key_cleanup_module(void)
 607 {
 608         tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 609 }
 610
 611 module_init(tunnel_key_init_module);
 612 module_exit(tunnel_key_cleanup_module);
 613
 614 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
 615 MODULE_DESCRIPTION("ip tunnel manipulation actions");
 616 MODULE_LICENSE("GPL v2");