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 #include <net/pkt_cls.h>
  21
  22 #include <linux/tc_act/tc_tunnel_key.h>
  23 #include <net/tc_act/tc_tunnel_key.h>
  24
  25 static unsigned int tunnel_key_net_id;
  26 static struct tc_action_ops act_tunnel_key_ops;
  27
  28 static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
  29                           struct tcf_result *res)
  30 {
  31         struct tcf_tunnel_key *t = to_tunnel_key(a);
  32         struct tcf_tunnel_key_params *params;
  33         int action;
  34
  35         params = rcu_dereference_bh(t->params);
  36
  37         tcf_lastuse_update(&t->tcf_tm);
  38         bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
  39         action = READ_ONCE(t->tcf_action);
  40
  41         switch (params->tcft_action) {
  42         case TCA_TUNNEL_KEY_ACT_RELEASE:
  43                 skb_dst_drop(skb);
  44                 break;
  45         case TCA_TUNNEL_KEY_ACT_SET:
  46                 skb_dst_drop(skb);
  47                 skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
  48                 break;
  49         default:
  50                 WARN_ONCE(1, "Bad tunnel_key action %d.\n",
  51                           params->tcft_action);
  52                 break;
  53         }
  54
  55         return action;
  56 }
  57
  58 static const struct nla_policy
  59 enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
  60         [TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]        = { .type = NLA_NESTED },
  61 };
  62
  63 static const struct nla_policy
  64 geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
  65         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]      = { .type = NLA_U16 },
  66         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]       = { .type = NLA_U8 },
  67         [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]       = { .type = NLA_BINARY,
  68                                                        .len = 128 },
  69 };
  70
  71 static int
  72 tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
  73                            struct netlink_ext_ack *extack)
  74 {
  75         struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
  76         int err, data_len, opt_len;
  77         u8 *data;
  78
  79         err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
  80                                nla, geneve_opt_policy, extack);
  81         if (err < 0)
  82                 return err;
  83
  84         if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
  85             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
  86             !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
  87                 NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
  88                 return -EINVAL;
  89         }
  90
  91         data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  92         data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
  93         if (data_len < 4) {
  94                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
  95                 return -ERANGE;
  96         }
  97         if (data_len % 4) {
  98                 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
  99                 return -ERANGE;
 100         }
 101
 102         opt_len = sizeof(struct geneve_opt) + data_len;
 103         if (dst) {
 104                 struct geneve_opt *opt = dst;
 105
 106                 WARN_ON(dst_len < opt_len);
 107
 108                 opt->opt_class =
 109                         nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
 110                 opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
 111                 opt->length = data_len / 4; /* length is in units of 4 bytes */
 112                 opt->r1 = 0;
 113                 opt->r2 = 0;
 114                 opt->r3 = 0;
 115
 116                 memcpy(opt + 1, data, data_len);
 117         }
 118
 119         return opt_len;
 120 }
 121
 122 static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
 123                                 int dst_len, struct netlink_ext_ack *extack)
 124 {
 125         int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
 126         const struct nlattr *attr, *head = nla_data(nla);
 127
 128         err = nla_validate(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
 129                            enc_opts_policy, extack);
 130         if (err)
 131                 return err;
 132
 133         nla_for_each_attr(attr, head, len, rem) {
 134                 switch (nla_type(attr)) {
 135                 case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 136                         opt_len = tunnel_key_copy_geneve_opt(attr, dst,
 137                                                              dst_len, extack);
 138                         if (opt_len < 0)
 139                                 return opt_len;
 140                         opts_len += opt_len;
 141                         if (dst) {
 142                                 dst_len -= opt_len;
 143                                 dst += opt_len;
 144                         }
 145                         break;
 146                 }
 147         }
 148
 149         if (!opts_len) {
 150                 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 151                 return -EINVAL;
 152         }
 153
 154         if (rem > 0) {
 155                 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 156                 return -EINVAL;
 157         }
 158
 159         return opts_len;
 160 }
 161
 162 static int tunnel_key_get_opts_len(struct nlattr *nla,
 163                                    struct netlink_ext_ack *extack)
 164 {
 165         return tunnel_key_copy_opts(nla, NULL, 0, extack);
 166 }
 167
 168 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 169                                int opts_len, struct netlink_ext_ack *extack)
 170 {
 171         info->options_len = opts_len;
 172         switch (nla_type(nla_data(nla))) {
 173         case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 174 #if IS_ENABLED(CONFIG_INET)
 175                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 176                 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 177                                             opts_len, extack);
 178 #else
 179                 return -EAFNOSUPPORT;
 180 #endif
 181         default:
 182                 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 183                 return -EINVAL;
 184         }
 185 }
 186
 187 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 188         [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 189         [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 190         [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 191         [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 192         [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 193         [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 194         [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 195         [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 196         [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 197         [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 198         [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 199 };
 200
 201 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 202 {
 203         if (!p)
 204                 return;
 205         if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 206                 dst_release(&p->tcft_enc_metadata->dst);
 207
 208         kfree_rcu(p, rcu);
 209 }
 210
 211 static int tunnel_key_init(struct net *net, struct nlattr *nla,
 212                            struct nlattr *est, struct tc_action **a,
 213                            int ovr, int bind, bool rtnl_held,
 214                            struct tcf_proto *tp,
 215                            struct netlink_ext_ack *extack)
 216 {
 217         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 218         struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
 219         struct tcf_tunnel_key_params *params_new;
 220         struct metadata_dst *metadata = NULL;
 221         struct tcf_chain *goto_ch = NULL;
 222         struct tc_tunnel_key *parm;
 223         struct tcf_tunnel_key *t;
 224         bool exists = false;
 225         __be16 dst_port = 0;
 226         __be64 key_id = 0;
 227         int opts_len = 0;
 228         __be16 flags = 0;
 229         u8 tos, ttl;
 230         int ret = 0;
 231         int err;
 232
 233         if (!nla) {
 234                 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 235                 return -EINVAL;
 236         }
 237
 238         err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
 239                                extack);
 240         if (err < 0) {
 241                 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 242                 return err;
 243         }
 244
 245         if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 246                 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 247                 return -EINVAL;
 248         }
 249
 250         parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 251         err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
 252         if (err < 0)
 253                 return err;
 254         exists = err;
 255         if (exists && bind)
 256                 return 0;
 257
 258         switch (parm->t_action) {
 259         case TCA_TUNNEL_KEY_ACT_RELEASE:
 260                 break;
 261         case TCA_TUNNEL_KEY_ACT_SET:
 262                 if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 263                         __be32 key32;
 264
 265                         key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
 266                         key_id = key32_to_tunnel_id(key32);
 267                         flags = TUNNEL_KEY;
 268                 }
 269
 270                 flags |= TUNNEL_CSUM;
 271                 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 272                     nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 273                         flags &= ~TUNNEL_CSUM;
 274
 275                 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 276                         dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 277
 278                 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 279                         opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 280                                                            extack);
 281                         if (opts_len < 0) {
 282                                 ret = opts_len;
 283                                 goto err_out;
 284                         }
 285                 }
 286
 287                 tos = 0;
 288                 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 289                         tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 290                 ttl = 0;
 291                 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 292                         ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 293
 294                 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 295                     tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 296                         __be32 saddr;
 297                         __be32 daddr;
 298
 299                         saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 300                         daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 301
 302                         metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 303                                                     dst_port, flags,
 304                                                     key_id, opts_len);
 305                 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 306                            tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 307                         struct in6_addr saddr;
 308                         struct in6_addr daddr;
 309
 310                         saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 311                         daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 312
 313                         metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 314                                                       0, flags,
 315                                                       key_id, 0);
 316                 } else {
 317                         NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 318                         ret = -EINVAL;
 319                         goto err_out;
 320                 }
 321
 322                 if (!metadata) {
 323                         NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 324                         ret = -ENOMEM;
 325                         goto err_out;
 326                 }
 327
 328 #ifdef CONFIG_DST_CACHE
 329                 ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
 330                 if (ret)
 331                         goto release_tun_meta;
 332 #endif
 333
 334                 if (opts_len) {
 335                         ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 336                                                   &metadata->u.tun_info,
 337                                                   opts_len, extack);
 338                         if (ret < 0)
 339                                 goto release_tun_meta;
 340                 }
 341
 342                 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 343                 break;
 344         default:
 345                 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 346                 ret = -EINVAL;
 347                 goto err_out;
 348         }
 349
 350         if (!exists) {
 351                 ret = tcf_idr_create(tn, parm->index, est, a,
 352                                      &act_tunnel_key_ops, bind, true);
 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, parm->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(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(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(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");