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         bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), 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 (opts_len > IP_TUNNEL_OPTS_MAX) {
 139                                 NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
 140                                 return -EINVAL;
 141                         }
 142                         if (dst) {
 143                                 dst_len -= opt_len;
 144                                 dst += opt_len;
 145                         }
 146                         break;
 147                 }
 148         }
 149
 150         if (!opts_len) {
 151                 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
 152                 return -EINVAL;
 153         }
 154
 155         if (rem > 0) {
 156                 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
 157                 return -EINVAL;
 158         }
 159
 160         return opts_len;
 161 }
 162
 163 static int tunnel_key_get_opts_len(struct nlattr *nla,
 164                                    struct netlink_ext_ack *extack)
 165 {
 166         return tunnel_key_copy_opts(nla, NULL, 0, extack);
 167 }
 168
 169 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
 170                                int opts_len, struct netlink_ext_ack *extack)
 171 {
 172         info->options_len = opts_len;
 173         switch (nla_type(nla_data(nla))) {
 174         case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
 175 #if IS_ENABLED(CONFIG_INET)
 176                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 177                 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
 178                                             opts_len, extack);
 179 #else
 180                 return -EAFNOSUPPORT;
 181 #endif
 182         default:
 183                 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
 184                 return -EINVAL;
 185         }
 186 }
 187
 188 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 189         [TCA_TUNNEL_KEY_PARMS]      = { .len = sizeof(struct tc_tunnel_key) },
 190         [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
 191         [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
 192         [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
 193         [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
 194         [TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
 195         [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 196         [TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 197         [TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
 198         [TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
 199         [TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 200 };
 201
 202 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
 203 {
 204         if (!p)
 205                 return;
 206         if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
 207                 dst_release(&p->tcft_enc_metadata->dst);
 208
 209         kfree_rcu(p, rcu);
 210 }
 211
 212 static int tunnel_key_init(struct net *net, struct nlattr *nla,
 213                            struct nlattr *est, struct tc_action **a,
 214                            int ovr, int bind, bool rtnl_held,
 215                            struct tcf_proto *tp,
 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 tcf_chain *goto_ch = NULL;
 223         struct tc_tunnel_key *parm;
 224         struct tcf_tunnel_key *t;
 225         bool exists = false;
 226         __be16 dst_port = 0;
 227         __be64 key_id = 0;
 228         int opts_len = 0;
 229         __be16 flags = 0;
 230         u8 tos, ttl;
 231         int ret = 0;
 232         u32 index;
 233         int err;
 234
 235         if (!nla) {
 236                 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
 237                 return -EINVAL;
 238         }
 239
 240         err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
 241                                           tunnel_key_policy, extack);
 242         if (err < 0) {
 243                 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
 244                 return err;
 245         }
 246
 247         if (!tb[TCA_TUNNEL_KEY_PARMS]) {
 248                 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
 249                 return -EINVAL;
 250         }
 251
 252         parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
 253         index = parm->index;
 254         err = tcf_idr_check_alloc(tn, &index, a, bind);
 255         if (err < 0)
 256                 return err;
 257         exists = err;
 258         if (exists && bind)
 259                 return 0;
 260
 261         switch (parm->t_action) {
 262         case TCA_TUNNEL_KEY_ACT_RELEASE:
 263                 break;
 264         case TCA_TUNNEL_KEY_ACT_SET:
 265                 if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
 266                         __be32 key32;
 267
 268                         key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
 269                         key_id = key32_to_tunnel_id(key32);
 270                         flags = TUNNEL_KEY;
 271                 }
 272
 273                 flags |= TUNNEL_CSUM;
 274                 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
 275                     nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 276                         flags &= ~TUNNEL_CSUM;
 277
 278                 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 279                         dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 280
 281                 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
 282                         opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 283                                                            extack);
 284                         if (opts_len < 0) {
 285                                 ret = opts_len;
 286                                 goto err_out;
 287                         }
 288                 }
 289
 290                 tos = 0;
 291                 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
 292                         tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
 293                 ttl = 0;
 294                 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
 295                         ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
 296
 297                 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 298                     tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 299                         __be32 saddr;
 300                         __be32 daddr;
 301
 302                         saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 303                         daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 304
 305                         metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 306                                                     dst_port, flags,
 307                                                     key_id, opts_len);
 308                 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
 309                            tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
 310                         struct in6_addr saddr;
 311                         struct in6_addr daddr;
 312
 313                         saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 314                         daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 315
 316                         metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 317                                                       0, flags,
 318                                                       key_id, 0);
 319                 } else {
 320                         NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
 321                         ret = -EINVAL;
 322                         goto err_out;
 323                 }
 324
 325                 if (!metadata) {
 326                         NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
 327                         ret = -ENOMEM;
 328                         goto err_out;
 329                 }
 330
 331 #ifdef CONFIG_DST_CACHE
 332                 ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
 333                 if (ret)
 334                         goto release_tun_meta;
 335 #endif
 336
 337                 if (opts_len) {
 338                         ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
 339                                                   &metadata->u.tun_info,
 340                                                   opts_len, extack);
 341                         if (ret < 0)
 342                                 goto release_tun_meta;
 343                 }
 344
 345                 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
 346                 break;
 347         default:
 348                 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
 349                 ret = -EINVAL;
 350                 goto err_out;
 351         }
 352
 353         if (!exists) {
 354                 ret = tcf_idr_create(tn, index, est, a,
 355                                      &act_tunnel_key_ops, bind, true);
 356                 if (ret) {
 357                         NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
 358                         goto release_tun_meta;
 359                 }
 360
 361                 ret = ACT_P_CREATED;
 362         } else if (!ovr) {
 363                 NL_SET_ERR_MSG(extack, "TC IDR already exists");
 364                 ret = -EEXIST;
 365                 goto release_tun_meta;
 366         }
 367
 368         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 369         if (err < 0) {
 370                 ret = err;
 371                 exists = true;
 372                 goto release_tun_meta;
 373         }
 374         t = to_tunnel_key(*a);
 375
 376         params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 377         if (unlikely(!params_new)) {
 378                 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
 379                 ret = -ENOMEM;
 380                 exists = true;
 381                 goto put_chain;
 382         }
 383         params_new->tcft_action = parm->t_action;
 384         params_new->tcft_enc_metadata = metadata;
 385
 386         spin_lock_bh(&t->tcf_lock);
 387         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 388         rcu_swap_protected(t->params, params_new,
 389                            lockdep_is_held(&t->tcf_lock));
 390         spin_unlock_bh(&t->tcf_lock);
 391         tunnel_key_release_params(params_new);
 392         if (goto_ch)
 393                 tcf_chain_put_by_act(goto_ch);
 394
 395         if (ret == ACT_P_CREATED)
 396                 tcf_idr_insert(tn, *a);
 397
 398         return ret;
 399
 400 put_chain:
 401         if (goto_ch)
 402                 tcf_chain_put_by_act(goto_ch);
 403
 404 release_tun_meta:
 405         if (metadata)
 406                 dst_release(&metadata->dst);
 407
 408 err_out:
 409         if (exists)
 410                 tcf_idr_release(*a, bind);
 411         else
 412                 tcf_idr_cleanup(tn, index);
 413         return ret;
 414 }
 415
 416 static void tunnel_key_release(struct tc_action *a)
 417 {
 418         struct tcf_tunnel_key *t = to_tunnel_key(a);
 419         struct tcf_tunnel_key_params *params;
 420
 421         params = rcu_dereference_protected(t->params, 1);
 422         tunnel_key_release_params(params);
 423 }
 424
 425 static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
 426                                        const struct ip_tunnel_info *info)
 427 {
 428         int len = info->options_len;
 429         u8 *src = (u8 *)(info + 1);
 430         struct nlattr *start;
 431
 432         start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
 433         if (!start)
 434                 return -EMSGSIZE;
 435
 436         while (len > 0) {
 437                 struct geneve_opt *opt = (struct geneve_opt *)src;
 438
 439                 if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
 440                                  opt->opt_class) ||
 441                     nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
 442                                opt->type) ||
 443                     nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
 444                             opt->length * 4, opt + 1)) {
 445                         nla_nest_cancel(skb, start);
 446                         return -EMSGSIZE;
 447                 }
 448
 449                 len -= sizeof(struct geneve_opt) + opt->length * 4;
 450                 src += sizeof(struct geneve_opt) + opt->length * 4;
 451         }
 452
 453         nla_nest_end(skb, start);
 454         return 0;
 455 }
 456
 457 static int tunnel_key_opts_dump(struct sk_buff *skb,
 458                                 const struct ip_tunnel_info *info)
 459 {
 460         struct nlattr *start;
 461         int err = -EINVAL;
 462
 463         if (!info->options_len)
 464                 return 0;
 465
 466         start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
 467         if (!start)
 468                 return -EMSGSIZE;
 469
 470         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 471                 err = tunnel_key_geneve_opts_dump(skb, info);
 472                 if (err)
 473                         goto err_out;
 474         } else {
 475 err_out:
 476                 nla_nest_cancel(skb, start);
 477                 return err;
 478         }
 479
 480         nla_nest_end(skb, start);
 481         return 0;
 482 }
 483
 484 static int tunnel_key_dump_addresses(struct sk_buff *skb,
 485                                      const struct ip_tunnel_info *info)
 486 {
 487         unsigned short family = ip_tunnel_info_af(info);
 488
 489         if (family == AF_INET) {
 490                 __be32 saddr = info->key.u.ipv4.src;
 491                 __be32 daddr = info->key.u.ipv4.dst;
 492
 493                 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
 494                     !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
 495                         return 0;
 496         }
 497
 498         if (family == AF_INET6) {
 499                 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
 500                 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
 501
 502                 if (!nla_put_in6_addr(skb,
 503                                       TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
 504                     !nla_put_in6_addr(skb,
 505                                       TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
 506                         return 0;
 507         }
 508
 509         return -EINVAL;
 510 }
 511
 512 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 513                            int bind, int ref)
 514 {
 515         unsigned char *b = skb_tail_pointer(skb);
 516         struct tcf_tunnel_key *t = to_tunnel_key(a);
 517         struct tcf_tunnel_key_params *params;
 518         struct tc_tunnel_key opt = {
 519                 .index    = t->tcf_index,
 520                 .refcnt   = refcount_read(&t->tcf_refcnt) - ref,
 521                 .bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
 522         };
 523         struct tcf_t tm;
 524
 525         spin_lock_bh(&t->tcf_lock);
 526         params = rcu_dereference_protected(t->params,
 527                                            lockdep_is_held(&t->tcf_lock));
 528         opt.action   = t->tcf_action;
 529         opt.t_action = params->tcft_action;
 530
 531         if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
 532                 goto nla_put_failure;
 533
 534         if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
 535                 struct ip_tunnel_info *info =
 536                         &params->tcft_enc_metadata->u.tun_info;
 537                 struct ip_tunnel_key *key = &info->key;
 538                 __be32 key_id = tunnel_id_to_key32(key->tun_id);
 539
 540                 if (((key->tun_flags & TUNNEL_KEY) &&
 541                      nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
 542                     tunnel_key_dump_addresses(skb,
 543                                               &params->tcft_enc_metadata->u.tun_info) ||
 544                     (key->tp_dst &&
 545                       nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
 546                                    key->tp_dst)) ||
 547                     nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 548                                !(key->tun_flags & TUNNEL_CSUM)) ||
 549                     tunnel_key_opts_dump(skb, info))
 550                         goto nla_put_failure;
 551
 552                 if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
 553                         goto nla_put_failure;
 554
 555                 if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
 556                         goto nla_put_failure;
 557         }
 558
 559         tcf_tm_dump(&tm, &t->tcf_tm);
 560         if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
 561                           &tm, TCA_TUNNEL_KEY_PAD))
 562                 goto nla_put_failure;
 563         spin_unlock_bh(&t->tcf_lock);
 564
 565         return skb->len;
 566
 567 nla_put_failure:
 568         spin_unlock_bh(&t->tcf_lock);
 569         nlmsg_trim(skb, b);
 570         return -1;
 571 }
 572
 573 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
 574                              struct netlink_callback *cb, int type,
 575                              const struct tc_action_ops *ops,
 576                              struct netlink_ext_ack *extack)
 577 {
 578         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 579
 580         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 581 }
 582
 583 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
 584 {
 585         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 586
 587         return tcf_idr_search(tn, a, index);
 588 }
 589
 590 static struct tc_action_ops act_tunnel_key_ops = {
 591         .kind           =       "tunnel_key",
 592         .id             =       TCA_ID_TUNNEL_KEY,
 593         .owner          =       THIS_MODULE,
 594         .act            =       tunnel_key_act,
 595         .dump           =       tunnel_key_dump,
 596         .init           =       tunnel_key_init,
 597         .cleanup        =       tunnel_key_release,
 598         .walk           =       tunnel_key_walker,
 599         .lookup         =       tunnel_key_search,
 600         .size           =       sizeof(struct tcf_tunnel_key),
 601 };
 602
 603 static __net_init int tunnel_key_init_net(struct net *net)
 604 {
 605         struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 606
 607         return tc_action_net_init(net, tn, &act_tunnel_key_ops);
 608 }
 609
 610 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
 611 {
 612         tc_action_net_exit(net_list, tunnel_key_net_id);
 613 }
 614
 615 static struct pernet_operations tunnel_key_net_ops = {
 616         .init = tunnel_key_init_net,
 617         .exit_batch = tunnel_key_exit_net,
 618         .id   = &tunnel_key_net_id,
 619         .size = sizeof(struct tc_action_net),
 620 };
 621
 622 static int __init tunnel_key_init_module(void)
 623 {
 624         return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 625 }
 626
 627 static void __exit tunnel_key_cleanup_module(void)
 628 {
 629         tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
 630 }
 631
 632 module_init(tunnel_key_init_module);
 633 module_exit(tunnel_key_cleanup_module);
 634
 635 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
 636 MODULE_DESCRIPTION("ip tunnel manipulation actions");
 637 MODULE_LICENSE("GPL v2");