net/sched/act_tunnel_key.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
   4  * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/rtnetlink.h>
  12 #include <net/geneve.h>
  13 #include <net/netlink.h>
  14 #include <net/pkt_sched.h>
  15 #include <net/dst.h>
  16 #include <net/pkt_cls.h>
  17
  18 #include <linux/tc_act/tc_tunnel_key.h>
  19 #include <net/tc_act/tc_tunnel_key.h>
  20
  21 static unsigned int tunnel_key_net_id;
  22 static struct tc_action_ops act_tunnel_key_ops;
  23
  24 static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
  25                           struct tcf_result *res)
  26 {
  27         struct tcf_tunnel_key *t = to_tunnel_key(a);
  28         struct tcf_tunnel_key_params *params;
  29         int action;
  30
  31         params = rcu_dereference_bh(t->params);
  32
  33         tcf_lastuse_update(&t->tcf_tm);
  34         tcf_action_update_bstats(&t->common, skb);
  35         action = READ_ONCE(t->tcf_action);
  36
  37         switch (params->tcft_action) {
  38         case TCA_TUNNEL_KEY_ACT_RELEASE:
  39                 skb_dst_drop(skb);
  40                 break;
  41         case TCA_TUNNEL_KEY_ACT_SET:
  42                 skb_dst_drop(skb);
  43                 skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
  44                 break;
  45         default:
  46                 WARN_ONCE(1, "Bad tunnel_key action %d.\n",
  47                           params->tcft_action);
  48                 break;
  49         }
  50
  51         return action;
  52 }
  53
  54 static const struct nla_policy
  55 enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
  56         [TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]        = { .type = NLA_NESTED },
  57 };
  58
  59 static const struct nla_policy
  60 geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
  61         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]      = { .type = NLA_U16 },
  62         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]       = { .type = NLA_U8 },
  63         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]       = { .type = NLA_BINARY,
  64                                                        .len = 128 },
  65 };
  66
  67 static int
  68 tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
  69                            struct netlink_ext_ack *extack)
  70 {
  71         struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
  72         int err, data_len, opt_len;
  73         u8 *data;
  74
  75         err = nla_parse_nested_deprecated(tb,
  76                                           TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
  77                                           nla, geneve_opt_policy, extack);
  78         if (err < 0)
  79                 return err;
  80
  81         if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
  82             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
  83             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
  84                 NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
  85                 return -EINVAL;
  86         }
  87
  88         data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  89         data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  90         if (data_len < 4) {
  91                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
  92                 return -ERANGE;
  93         }
  94         if (data_len % 4) {
  95                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
  96                 return -ERANGE;
  97         }
  98
  99         opt_len = sizeof(struct geneve_opt) + data_len;
 100         if (dst) {
 101                 struct geneve_opt *opt = dst;
 102
 103                 WARN_ON(dst_len < opt_len);
 104
 105                 opt->opt_class =
 106                         nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
 107                 opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
 108                 opt->length = data_len / 4; /* length is in units of 4 bytes */
 109                 opt->r1 = 0;
 110                 opt->r2 = 0;
 111                 opt->r3 = 0;
 112
 113                 memcpy(opt + 1, data, data_len);
 114         }
 115
 116         return opt_len;
 117 }
 118
 119 static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
 120                                 int dst_len, struct netlink_ext_ack *extack)
 121 {
 122         int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
 123         const struct nlattr *attr, *head = nla_data(nla);
 124
 125         err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
 126                                       enc_opts_policy, extack);
 127         if (err)
 128                 return err;
 129
 130         nla_for_each_attr(attr, head, len, rem) {
 131                 switch (nla_type(attr)) {
 132                 case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 133                         opt_len = tunnel_key_copy_geneve_opt(attr, dst,
 134                                                              dst_len, extack);
 135                         if (opt_len < 0)
 136                                 return opt_len;
 137                         opts_len += opt_len;
 138                         if (dst) {
 139                                 dst_len -= opt_len;
 140                                 dst += opt_len;
 141                         }
 142                         break;
 143                 }
 144         }
 145
 146         if (!opts_len) {
 147                 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 148                 return -EINVAL;
 149         }
 150
 151         if (rem > 0) {
 152                 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 153                 return -EINVAL;
 154         }
 155
 156         return opts_len;
 157 }
 158
 159 static int tunnel_key_get_opts_len(struct nlattr *nla,
 160                                    struct netlink_ext_ack *extack)
 161 {
 162         return tunnel_key_copy_opts(nla, NULL, 0, extack);
 163 }
 164
 165 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 166                                int opts_len, struct netlink_ext_ack *extack)
 167 {
 168         info->options_len = opts_len;
 169         switch (nla_type(nla_data(nla))) {
 170         case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 171 #if IS_ENABLED(CONFIG_INET)
 172                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 173                 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 174                                             opts_len, extack);
 175 #else
 176                 return -EAFNOSUPPORT;
 177 #endif
 178         default:
 179                 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 180                 return -EINVAL;
 181         }
 182 }
 183
 184 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 185         [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 186         [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 187         [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 188         [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 189         [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 190         [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 191         [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 192         [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 193         [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 194         [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 195         [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 196 };
 197
 198 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 199 {
 200         if (!p)
 201                 return;
 202         if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 203                 dst_release(&p->tcft_enc_metadata->dst);
 204
 205         kfree_rcu(p, rcu);
 206 }
 207
 208 static int tunnel_key_init(struct net *net, struct nlattr *nla,
 209                            struct nlattr *est, struct tc_action **a,
 210                            int ovr, int bind, bool rtnl_held,
 211                            struct tcf_proto *tp, u32 act_flags,
 212                            struct netlink_ext_ack *extack)
 213 {
 214         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 215         struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
 216         struct tcf_tunnel_key_params *params_new;
 217         struct metadata_dst *metadata = NULL;
 218         struct tcf_chain *goto_ch = 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         u32 index;
 229         int err;
 230
 231         if (!nla) {
 232                 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 233                 return -EINVAL;
 234         }
 235
 236         err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
 237                                           tunnel_key_policy, extack);
 238         if (err < 0) {
 239                 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 240                 return err;
 241         }
 242
 243         if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 244                 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 245                 return -EINVAL;
 246         }
 247
 248         parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 249         index = parm->index;
 250         err = tcf_idr_check_alloc(tn, &index, a, bind);
 251         if (err < 0)
 252                 return err;
 253         exists = err;
 254         if (exists && bind)
 255                 return 0;
 256
 257         switch (parm->t_action) {
 258         case TCA_TUNNEL_KEY_ACT_RELEASE:
 259                 break;
 260         case TCA_TUNNEL_KEY_ACT_SET:
 261                 if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 262                         __be32 key32;
 263
 264                         key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
 265                         key_id = key32_to_tunnel_id(key32);
 266                         flags = TUNNEL_KEY;
 267                 }
 268
 269                 flags |= TUNNEL_CSUM;
 270                 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 271                     nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 272                         flags &= ~TUNNEL_CSUM;
 273
 274                 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 275                         dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 276
 277                 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 278                         opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 279                                                            extack);
 280                         if (opts_len < 0) {
 281                                 ret = opts_len;
 282                                 goto err_out;
 283                         }
 284                 }
 285
 286                 tos = 0;
 287                 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 288                         tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 289                 ttl = 0;
 290                 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 291                         ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 292
 293                 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 294                     tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 295                         __be32 saddr;
 296                         __be32 daddr;
 297
 298                         saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 299                         daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 300
 301                         metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 302                                                     dst_port, flags,
 303                                                     key_id, opts_len);
 304                 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 305                            tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 306                         struct in6_addr saddr;
 307                         struct in6_addr daddr;
 308
 309                         saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 310                         daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 311
 312                         metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 313                                                       0, flags,
 314                                                       key_id, 0);
 315                 } else {
 316                         NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 317                         ret = -EINVAL;
 318                         goto err_out;
 319                 }
 320
 321                 if (!metadata) {
 322                         NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 323                         ret = -ENOMEM;
 324                         goto err_out;
 325                 }
 326
 327 #ifdef CONFIG_DST_CACHE
 328                 ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
 329                 if (ret)
 330                         goto release_tun_meta;
 331 #endif
 332
 333                 if (opts_len) {
 334                         ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 335                                                   &metadata->u.tun_info,
 336                                                   opts_len, extack);
 337                         if (ret < 0)
 338                                 goto release_tun_meta;
 339                 }
 340
 341                 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 342                 break;
 343         default:
 344                 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 345                 ret = -EINVAL;
 346                 goto err_out;
 347         }
 348
 349         if (!exists) {
 350                 ret = tcf_idr_create_from_flags(tn, index, est, a,
 351                                                 &act_tunnel_key_ops, bind,
 352                                                 act_flags);
 353                 if (ret) {
 354                         NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
 355                         goto release_tun_meta;
 356                 }
 357
 358                 ret = ACT_P_CREATED;
 359         } else if (!ovr) {
 360                 NL_SET_ERR_MSG(extack, "TC IDR already exists");
 361                 ret = -EEXIST;
 362                 goto release_tun_meta;
 363         }
 364
 365         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 366         if (err < 0) {
 367                 ret = err;
 368                 exists = true;
 369                 goto release_tun_meta;
 370         }
 371         t = to_tunnel_key(*a);
 372
 373         params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 374         if (unlikely(!params_new)) {
 375                 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
 376                 ret = -ENOMEM;
 377                 exists = true;
 378                 goto put_chain;
 379         }
 380         params_new->tcft_action = parm->t_action;
 381         params_new->tcft_enc_metadata = metadata;
 382
 383         spin_lock_bh(&t->tcf_lock);
 384         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 385         rcu_swap_protected(t->params, params_new,
 386                            lockdep_is_held(&t->tcf_lock));
 387         spin_unlock_bh(&t->tcf_lock);
 388         tunnel_key_release_params(params_new);
 389         if (goto_ch)
 390                 tcf_chain_put_by_act(goto_ch);
 391
 392         if (ret == ACT_P_CREATED)
 393                 tcf_idr_insert(tn, *a);
 394
 395         return ret;
 396
 397 put_chain:
 398         if (goto_ch)
 399                 tcf_chain_put_by_act(goto_ch);
 400
 401 release_tun_meta:
 402         if (metadata)
 403                 dst_release(&metadata->dst);
 404
 405 err_out:
 406         if (exists)
 407                 tcf_idr_release(*a, bind);
 408         else
 409                 tcf_idr_cleanup(tn, index);
 410         return ret;
 411 }
 412
 413 static void tunnel_key_release(struct tc_action *a)
 414 {
 415         struct tcf_tunnel_key *t = to_tunnel_key(a);
 416         struct tcf_tunnel_key_params *params;
 417
 418         params = rcu_dereference_protected(t->params, 1);
 419         tunnel_key_release_params(params);
 420 }
 421
 422 static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
 423                                        const struct ip_tunnel_info *info)
 424 {
 425         int len = info->options_len;
 426         u8 *src = (u8 *)(info + 1);
 427         struct nlattr *start;
 428
 429         start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
 430         if (!start)
 431                 return -EMSGSIZE;
 432
 433         while (len > 0) {
 434                 struct geneve_opt *opt = (struct geneve_opt *)src;
 435
 436                 if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
 437                                  opt->opt_class) ||
 438                     nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
 439                                opt->type) ||
 440                     nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
 441                             opt->length * 4, opt + 1)) {
 442                         nla_nest_cancel(skb, start);
 443                         return -EMSGSIZE;
 444                 }
 445
 446                 len -= sizeof(struct geneve_opt) + opt->length * 4;
 447                 src += sizeof(struct geneve_opt) + opt->length * 4;
 448         }
 449
 450         nla_nest_end(skb, start);
 451         return 0;
 452 }
 453
 454 static int tunnel_key_opts_dump(struct sk_buff *skb,
 455                                 const struct ip_tunnel_info *info)
 456 {
 457         struct nlattr *start;
 458         int err = -EINVAL;
 459
 460         if (!info->options_len)
 461                 return 0;
 462
 463         start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
 464         if (!start)
 465                 return -EMSGSIZE;
 466
 467         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 468                 err = tunnel_key_geneve_opts_dump(skb, info);
 469                 if (err)
 470                         goto err_out;
 471         } else {
 472 err_out:
 473                 nla_nest_cancel(skb, start);
 474                 return err;
 475         }
 476
 477         nla_nest_end(skb, start);
 478         return 0;
 479 }
 480
 481 static int tunnel_key_dump_addresses(struct sk_buff *skb,
 482                                      const struct ip_tunnel_info *info)
 483 {
 484         unsigned short family = ip_tunnel_info_af(info);
 485
 486         if (family == AF_INET) {
 487                 __be32 saddr = info->key.u.ipv4.src;
 488                 __be32 daddr = info->key.u.ipv4.dst;
 489
 490                 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
 491                     !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
 492                         return 0;
 493         }
 494
 495         if (family == AF_INET6) {
 496                 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
 497                 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
 498
 499                 if (!nla_put_in6_addr(skb,
 500                                       TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
 501                     !nla_put_in6_addr(skb,
 502                                       TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
 503                         return 0;
 504         }
 505
 506         return -EINVAL;
 507 }
 508
 509 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 510                            int bind, int ref)
 511 {
 512         unsigned char *b = skb_tail_pointer(skb);
 513         struct tcf_tunnel_key *t = to_tunnel_key(a);
 514         struct tcf_tunnel_key_params *params;
 515         struct tc_tunnel_key opt = {
 516                 .index    = t->tcf_index,
 517                 .refcnt   = refcount_read(&t->tcf_refcnt) - ref,
 518                 .bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
 519         };
 520         struct tcf_t tm;
 521
 522         spin_lock_bh(&t->tcf_lock);
 523         params = rcu_dereference_protected(t->params,
 524                                            lockdep_is_held(&t->tcf_lock));
 525         opt.action   = t->tcf_action;
 526         opt.t_action = params->tcft_action;
 527
 528         if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
 529                 goto nla_put_failure;
 530
 531         if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
 532                 struct ip_tunnel_info *info =
 533                         &params->tcft_enc_metadata->u.tun_info;
 534                 struct ip_tunnel_key *key = &info->key;
 535                 __be32 key_id = tunnel_id_to_key32(key->tun_id);
 536
 537                 if (((key->tun_flags & TUNNEL_KEY) &&
 538                      nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
 539                     tunnel_key_dump_addresses(skb,
 540                                               &params->tcft_enc_metadata->u.tun_info) ||
 541                     (key->tp_dst &&
 542                       nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
 543                                    key->tp_dst)) ||
 544                     nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 545                                !(key->tun_flags & TUNNEL_CSUM)) ||
 546                     tunnel_key_opts_dump(skb, info))
 547                         goto nla_put_failure;
 548
 549                 if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
 550                         goto nla_put_failure;
 551
 552                 if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
 553                         goto nla_put_failure;
 554         }
 555
 556         tcf_tm_dump(&tm, &t->tcf_tm);
 557         if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
 558                           &tm, TCA_TUNNEL_KEY_PAD))
 559                 goto nla_put_failure;
 560         spin_unlock_bh(&t->tcf_lock);
 561
 562         return skb->len;
 563
 564 nla_put_failure:
 565         spin_unlock_bh(&t->tcf_lock);
 566         nlmsg_trim(skb, b);
 567         return -1;
 568 }
 569
 570 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
 571                              struct netlink_callback *cb, int type,
 572                              const struct tc_action_ops *ops,
 573                              struct netlink_ext_ack *extack)
 574 {
 575         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 576
 577         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 578 }
 579
 580 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
 581 {
 582         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 583
 584         return tcf_idr_search(tn, a, index);
 585 }
 586
 587 static struct tc_action_ops act_tunnel_key_ops = {
 588         .kind           =       "tunnel_key",
 589         .id             =       TCA_ID_TUNNEL_KEY,
 590         .owner          =       THIS_MODULE,
 591         .act            =       tunnel_key_act,
 592         .dump           =       tunnel_key_dump,
 593         .init           =       tunnel_key_init,
 594         .cleanup        =       tunnel_key_release,
 595         .walk           =       tunnel_key_walker,
 596         .lookup         =       tunnel_key_search,
 597         .size           =       sizeof(struct tcf_tunnel_key),
 598 };
 599
 600 static __net_init int tunnel_key_init_net(struct net *net)
 601 {
 602         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 603
 604         return tc_action_net_init(net, tn, &act_tunnel_key_ops);
 605 }
 606
 607 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
 608 {
 609         tc_action_net_exit(net_list, tunnel_key_net_id);
 610 }
 611
 612 static struct pernet_operations tunnel_key_net_ops = {
 613         .init = tunnel_key_init_net,
 614         .exit_batch = tunnel_key_exit_net,
 615         .id   = &tunnel_key_net_id,
 616         .size = sizeof(struct tc_action_net),
 617 };
 618
 619 static int __init tunnel_key_init_module(void)
 620 {
 621         return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 622 }
 623
 624 static void __exit tunnel_key_cleanup_module(void)
 625 {
 626         tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 627 }
 628
 629 module_init(tunnel_key_init_module);
 630 module_exit(tunnel_key_cleanup_module);
 631
 632 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
 633 MODULE_DESCRIPTION("ip tunnel manipulation actions");
 634 MODULE_LICENSE("GPL v2");