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 (dst) {
 141                                 dst_len -= opt_len;
 142                                 dst += opt_len;
 143                         }
 144                         break;
 145                 }
 146         }
 147
 148         if (!opts_len) {
 149                 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 150                 return -EINVAL;
 151         }
 152
 153         if (rem > 0) {
 154                 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 155                 return -EINVAL;
 156         }
 157
 158         return opts_len;
 159 }
 160
 161 static int tunnel_key_get_opts_len(struct nlattr *nla,
 162                                    struct netlink_ext_ack *extack)
 163 {
 164         return tunnel_key_copy_opts(nla, NULL, 0, extack);
 165 }
 166
 167 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 168                                int opts_len, struct netlink_ext_ack *extack)
 169 {
 170         info->options_len = opts_len;
 171         switch (nla_type(nla_data(nla))) {
 172         case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 173 #if IS_ENABLED(CONFIG_INET)
 174                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 175                 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 176                                             opts_len, extack);
 177 #else
 178                 return -EAFNOSUPPORT;
 179 #endif
 180         default:
 181                 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 182                 return -EINVAL;
 183         }
 184 }
 185
 186 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 187         [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 188         [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 189         [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 190         [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 191         [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 192         [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 193         [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 194         [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 195         [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 196         [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 197         [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 198 };
 199
 200 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 201 {
 202         if (!p)
 203                 return;
 204         if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 205                 dst_release(&p->tcft_enc_metadata->dst);
 206
 207         kfree_rcu(p, rcu);
 208 }
 209
 210 static int tunnel_key_init(struct net *net, struct nlattr *nla,
 211                            struct nlattr *est, struct tc_action **a,
 212                            int ovr, int bind, bool rtnl_held,
 213                            struct netlink_ext_ack *extack)
 214 {
 215         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 216         struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
 217         struct tcf_tunnel_key_params *params_new;
 218         struct metadata_dst *metadata = NULL;
 219         struct tc_tunnel_key *parm;
 220         struct tcf_tunnel_key *t;
 221         bool exists = false;
 222         __be16 dst_port = 0;
 223         __be64 key_id = 0;
 224         int opts_len = 0;
 225         __be16 flags = 0;
 226         u8 tos, ttl;
 227         int ret = 0;
 228         int err;
 229
 230         if (!nla) {
 231                 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 232                 return -EINVAL;
 233         }
 234
 235         err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
 236                                extack);
 237         if (err < 0) {
 238                 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 239                 return err;
 240         }
 241
 242         if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 243                 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 244                 return -EINVAL;
 245         }
 246
 247         parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 248         err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
 249         if (err < 0)
 250                 return err;
 251         exists = err;
 252         if (exists && bind)
 253                 return 0;
 254
 255         switch (parm->t_action) {
 256         case TCA_TUNNEL_KEY_ACT_RELEASE:
 257                 break;
 258         case TCA_TUNNEL_KEY_ACT_SET:
 259                 if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 260                         __be32 key32;
 261
 262                         key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
 263                         key_id = key32_to_tunnel_id(key32);
 264                         flags = TUNNEL_KEY;
 265                 }
 266
 267                 flags |= TUNNEL_CSUM;
 268                 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 269                     nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 270                         flags &= ~TUNNEL_CSUM;
 271
 272                 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 273                         dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 274
 275                 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 276                         opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 277                                                            extack);
 278                         if (opts_len < 0) {
 279                                 ret = opts_len;
 280                                 goto err_out;
 281                         }
 282                 }
 283
 284                 tos = 0;
 285                 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 286                         tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 287                 ttl = 0;
 288                 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 289                         ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 290
 291                 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 292                     tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 293                         __be32 saddr;
 294                         __be32 daddr;
 295
 296                         saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 297                         daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 298
 299                         metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 300                                                     dst_port, flags,
 301                                                     key_id, opts_len);
 302                 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 303                            tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 304                         struct in6_addr saddr;
 305                         struct in6_addr daddr;
 306
 307                         saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 308                         daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 309
 310                         metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 311                                                       0, flags,
 312                                                       key_id, 0);
 313                 } else {
 314                         NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 315                         ret = -EINVAL;
 316                         goto err_out;
 317                 }
 318
 319                 if (!metadata) {
 320                         NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 321                         ret = -ENOMEM;
 322                         goto err_out;
 323                 }
 324
 325 #ifdef CONFIG_DST_CACHE
 326                 ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
 327                 if (ret)
 328                         goto release_tun_meta;
 329 #endif
 330
 331                 if (opts_len) {
 332                         ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 333                                                   &metadata->u.tun_info,
 334                                                   opts_len, extack);
 335                         if (ret < 0)
 336                                 goto release_tun_meta;
 337                 }
 338
 339                 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 340                 break;
 341         default:
 342                 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 343                 ret = -EINVAL;
 344                 goto err_out;
 345         }
 346
 347         if (!exists) {
 348                 ret = tcf_idr_create(tn, parm->index, est, a,
 349                                      &act_tunnel_key_ops, bind, true);
 350                 if (ret) {
 351                         NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
 352                         goto release_tun_meta;
 353                 }
 354
 355                 ret = ACT_P_CREATED;
 356         } else if (!ovr) {
 357                 NL_SET_ERR_MSG(extack, "TC IDR already exists");
 358                 ret = -EEXIST;
 359                 goto release_tun_meta;
 360         }
 361
 362         t = to_tunnel_key(*a);
 363
 364         params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 365         if (unlikely(!params_new)) {
 366                 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
 367                 ret = -ENOMEM;
 368                 exists = true;
 369                 goto release_tun_meta;
 370         }
 371         params_new->tcft_action = parm->t_action;
 372         params_new->tcft_enc_metadata = metadata;
 373
 374         spin_lock_bh(&t->tcf_lock);
 375         t->tcf_action = parm->action;
 376         rcu_swap_protected(t->params, params_new,
 377                            lockdep_is_held(&t->tcf_lock));
 378         spin_unlock_bh(&t->tcf_lock);
 379         tunnel_key_release_params(params_new);
 380
 381         if (ret == ACT_P_CREATED)
 382                 tcf_idr_insert(tn, *a);
 383
 384         return ret;
 385
 386 release_tun_meta:
 387         if (metadata)
 388                 dst_release(&metadata->dst);
 389
 390 err_out:
 391         if (exists)
 392                 tcf_idr_release(*a, bind);
 393         else
 394                 tcf_idr_cleanup(tn, parm->index);
 395         return ret;
 396 }
 397
 398 static void tunnel_key_release(struct tc_action *a)
 399 {
 400         struct tcf_tunnel_key *t = to_tunnel_key(a);
 401         struct tcf_tunnel_key_params *params;
 402
 403         params = rcu_dereference_protected(t->params, 1);
 404         tunnel_key_release_params(params);
 405 }
 406
 407 static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
 408                                        const struct ip_tunnel_info *info)
 409 {
 410         int len = info->options_len;
 411         u8 *src = (u8 *)(info + 1);
 412         struct nlattr *start;
 413
 414         start = nla_nest_start(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
 415         if (!start)
 416                 return -EMSGSIZE;
 417
 418         while (len > 0) {
 419                 struct geneve_opt *opt = (struct geneve_opt *)src;
 420
 421                 if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
 422                                  opt->opt_class) ||
 423                     nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
 424                                opt->type) ||
 425                     nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
 426                             opt->length * 4, opt + 1)) {
 427                         nla_nest_cancel(skb, start);
 428                         return -EMSGSIZE;
 429                 }
 430
 431                 len -= sizeof(struct geneve_opt) + opt->length * 4;
 432                 src += sizeof(struct geneve_opt) + opt->length * 4;
 433         }
 434
 435         nla_nest_end(skb, start);
 436         return 0;
 437 }
 438
 439 static int tunnel_key_opts_dump(struct sk_buff *skb,
 440                                 const struct ip_tunnel_info *info)
 441 {
 442         struct nlattr *start;
 443         int err = -EINVAL;
 444
 445         if (!info->options_len)
 446                 return 0;
 447
 448         start = nla_nest_start(skb, TCA_TUNNEL_KEY_ENC_OPTS);
 449         if (!start)
 450                 return -EMSGSIZE;
 451
 452         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 453                 err = tunnel_key_geneve_opts_dump(skb, info);
 454                 if (err)
 455                         goto err_out;
 456         } else {
 457 err_out:
 458                 nla_nest_cancel(skb, start);
 459                 return err;
 460         }
 461
 462         nla_nest_end(skb, start);
 463         return 0;
 464 }
 465
 466 static int tunnel_key_dump_addresses(struct sk_buff *skb,
 467                                      const struct ip_tunnel_info *info)
 468 {
 469         unsigned short family = ip_tunnel_info_af(info);
 470
 471         if (family == AF_INET) {
 472                 __be32 saddr = info->key.u.ipv4.src;
 473                 __be32 daddr = info->key.u.ipv4.dst;
 474
 475                 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
 476                     !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
 477                         return 0;
 478         }
 479
 480         if (family == AF_INET6) {
 481                 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
 482                 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
 483
 484                 if (!nla_put_in6_addr(skb,
 485                                       TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
 486                     !nla_put_in6_addr(skb,
 487                                       TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
 488                         return 0;
 489         }
 490
 491         return -EINVAL;
 492 }
 493
 494 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 495                            int bind, int ref)
 496 {
 497         unsigned char *b = skb_tail_pointer(skb);
 498         struct tcf_tunnel_key *t = to_tunnel_key(a);
 499         struct tcf_tunnel_key_params *params;
 500         struct tc_tunnel_key opt = {
 501                 .index    = t->tcf_index,
 502                 .refcnt   = refcount_read(&t->tcf_refcnt) - ref,
 503                 .bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
 504         };
 505         struct tcf_t tm;
 506
 507         spin_lock_bh(&t->tcf_lock);
 508         params = rcu_dereference_protected(t->params,
 509                                            lockdep_is_held(&t->tcf_lock));
 510         opt.action   = t->tcf_action;
 511         opt.t_action = params->tcft_action;
 512
 513         if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
 514                 goto nla_put_failure;
 515
 516         if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
 517                 struct ip_tunnel_info *info =
 518                         &params->tcft_enc_metadata->u.tun_info;
 519                 struct ip_tunnel_key *key = &info->key;
 520                 __be32 key_id = tunnel_id_to_key32(key->tun_id);
 521
 522                 if (((key->tun_flags & TUNNEL_KEY) &&
 523                      nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
 524                     tunnel_key_dump_addresses(skb,
 525                                               &params->tcft_enc_metadata->u.tun_info) ||
 526                     (key->tp_dst &&
 527                       nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
 528                                    key->tp_dst)) ||
 529                     nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 530                                !(key->tun_flags & TUNNEL_CSUM)) ||
 531                     tunnel_key_opts_dump(skb, info))
 532                         goto nla_put_failure;
 533
 534                 if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
 535                         goto nla_put_failure;
 536
 537                 if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
 538                         goto nla_put_failure;
 539         }
 540
 541         tcf_tm_dump(&tm, &t->tcf_tm);
 542         if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
 543                           &tm, TCA_TUNNEL_KEY_PAD))
 544                 goto nla_put_failure;
 545         spin_unlock_bh(&t->tcf_lock);
 546
 547         return skb->len;
 548
 549 nla_put_failure:
 550         spin_unlock_bh(&t->tcf_lock);
 551         nlmsg_trim(skb, b);
 552         return -1;
 553 }
 554
 555 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
 556                              struct netlink_callback *cb, int type,
 557                              const struct tc_action_ops *ops,
 558                              struct netlink_ext_ack *extack)
 559 {
 560         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 561
 562         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 563 }
 564
 565 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
 566 {
 567         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 568
 569         return tcf_idr_search(tn, a, index);
 570 }
 571
 572 static struct tc_action_ops act_tunnel_key_ops = {
 573         .kind           =       "tunnel_key",
 574         .id             =       TCA_ID_TUNNEL_KEY,
 575         .owner          =       THIS_MODULE,
 576         .act            =       tunnel_key_act,
 577         .dump           =       tunnel_key_dump,
 578         .init           =       tunnel_key_init,
 579         .cleanup        =       tunnel_key_release,
 580         .walk           =       tunnel_key_walker,
 581         .lookup         =       tunnel_key_search,
 582         .size           =       sizeof(struct tcf_tunnel_key),
 583 };
 584
 585 static __net_init int tunnel_key_init_net(struct net *net)
 586 {
 587         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 588
 589         return tc_action_net_init(tn, &act_tunnel_key_ops);
 590 }
 591
 592 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
 593 {
 594         tc_action_net_exit(net_list, tunnel_key_net_id);
 595 }
 596
 597 static struct pernet_operations tunnel_key_net_ops = {
 598         .init = tunnel_key_init_net,
 599         .exit_batch = tunnel_key_exit_net,
 600         .id   = &tunnel_key_net_id,
 601         .size = sizeof(struct tc_action_net),
 602 };
 603
 604 static int __init tunnel_key_init_module(void)
 605 {
 606         return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 607 }
 608
 609 static void __exit tunnel_key_cleanup_module(void)
 610 {
 611         tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 612 }
 613
 614 module_init(tunnel_key_init_module);
 615 module_exit(tunnel_key_cleanup_module);
 616
 617 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
 618 MODULE_DESCRIPTION("ip tunnel manipulation actions");
 619 MODULE_LICENSE("GPL v2");