net/sched/act_pedit.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/sched/act_pedit.c        Generic packet editor
   4  *
   5  * Authors:     Jamal Hadi Salim (2002-4)
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11 #include <linux/errno.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <net/netlink.h>
  18 #include <net/pkt_sched.h>
  19 #include <linux/tc_act/tc_pedit.h>
  20 #include <net/tc_act/tc_pedit.h>
  21 #include <uapi/linux/tc_act/tc_pedit.h>
  22 #include <net/pkt_cls.h>
  23 #include <net/tc_wrapper.h>
  24
  25 static struct tc_action_ops act_pedit_ops;
  26
  27 static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
  28         [TCA_PEDIT_PARMS]       = { .len = sizeof(struct tc_pedit) },
  29         [TCA_PEDIT_KEYS_EX]   = { .type = NLA_NESTED },
  30 };
  31
  32 static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
  33         [TCA_PEDIT_KEY_EX_HTYPE] =
  34                 NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_HDR_TYPE_MAX),
  35         [TCA_PEDIT_KEY_EX_CMD] = NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_CMD_MAX),
  36 };
  37
  38 static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
  39                                                         u8 n, struct netlink_ext_ack *extack)
  40 {
  41         struct tcf_pedit_key_ex *keys_ex;
  42         struct tcf_pedit_key_ex *k;
  43         const struct nlattr *ka;
  44         int err = -EINVAL;
  45         int rem;
  46
  47         if (!nla)
  48                 return NULL;
  49
  50         keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
  51         if (!keys_ex)
  52                 return ERR_PTR(-ENOMEM);
  53
  54         k = keys_ex;
  55
  56         nla_for_each_nested(ka, nla, rem) {
  57                 struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
  58
  59                 if (!n) {
  60                         NL_SET_ERR_MSG_MOD(extack, "Can't parse more extended keys than requested");
  61                         err = -EINVAL;
  62                         goto err_out;
  63                 }
  64                 n--;
  65
  66                 if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
  67                         NL_SET_ERR_MSG_ATTR(extack, ka, "Unknown attribute, expected extended key");
  68                         err = -EINVAL;
  69                         goto err_out;
  70                 }
  71
  72                 err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
  73                                                   ka, pedit_key_ex_policy,
  74                                                   NULL);
  75                 if (err)
  76                         goto err_out;
  77
  78                 if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_HTYPE)) {
  79                         NL_SET_ERR_MSG(extack, "Missing required attribute");
  80                         err = -EINVAL;
  81                         goto err_out;
  82                 }
  83
  84                 if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_CMD)) {
  85                         NL_SET_ERR_MSG(extack, "Missing required attribute");
  86                         err = -EINVAL;
  87                         goto err_out;
  88                 }
  89
  90                 k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
  91                 k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
  92
  93                 k++;
  94         }
  95
  96         if (n) {
  97                 NL_SET_ERR_MSG_MOD(extack, "Not enough extended keys to parse");
  98                 err = -EINVAL;
  99                 goto err_out;
 100         }
 101
 102         return keys_ex;
 103
 104 err_out:
 105         kfree(keys_ex);
 106         return ERR_PTR(err);
 107 }
 108
 109 static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
 110                                  struct tcf_pedit_key_ex *keys_ex, int n)
 111 {
 112         struct nlattr *keys_start = nla_nest_start_noflag(skb,
 113                                                           TCA_PEDIT_KEYS_EX);
 114
 115         if (!keys_start)
 116                 goto nla_failure;
 117         for (; n > 0; n--) {
 118                 struct nlattr *key_start;
 119
 120                 key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
 121                 if (!key_start)
 122                         goto nla_failure;
 123
 124                 if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
 125                     nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
 126                         goto nla_failure;
 127
 128                 nla_nest_end(skb, key_start);
 129
 130                 keys_ex++;
 131         }
 132
 133         nla_nest_end(skb, keys_start);
 134
 135         return 0;
 136 nla_failure:
 137         nla_nest_cancel(skb, keys_start);
 138         return -EINVAL;
 139 }
 140
 141 static void tcf_pedit_cleanup_rcu(struct rcu_head *head)
 142 {
 143         struct tcf_pedit_parms *parms =
 144                 container_of(head, struct tcf_pedit_parms, rcu);
 145
 146         kfree(parms->tcfp_keys_ex);
 147         kfree(parms->tcfp_keys);
 148
 149         kfree(parms);
 150 }
 151
 152 static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 153                           struct nlattr *est, struct tc_action **a,
 154                           struct tcf_proto *tp, u32 flags,
 155                           struct netlink_ext_ack *extack)
 156 {
 157         struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
 158         bool bind = flags & TCA_ACT_FLAGS_BIND;
 159         struct tcf_chain *goto_ch = NULL;
 160         struct tcf_pedit_parms *oparms, *nparms;
 161         struct nlattr *tb[TCA_PEDIT_MAX + 1];
 162         struct tc_pedit *parm;
 163         struct nlattr *pattr;
 164         struct tcf_pedit *p;
 165         int ret = 0, err;
 166         int i, ksize;
 167         u32 index;
 168
 169         if (!nla) {
 170                 NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
 171                 return -EINVAL;
 172         }
 173
 174         err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
 175                                           pedit_policy, NULL);
 176         if (err < 0)
 177                 return err;
 178
 179         pattr = tb[TCA_PEDIT_PARMS];
 180         if (!pattr)
 181                 pattr = tb[TCA_PEDIT_PARMS_EX];
 182         if (!pattr) {
 183                 NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
 184                 return -EINVAL;
 185         }
 186
 187         parm = nla_data(pattr);
 188
 189         index = parm->index;
 190         err = tcf_idr_check_alloc(tn, &index, a, bind);
 191         if (!err) {
 192                 ret = tcf_idr_create_from_flags(tn, index, est, a,
 193                                                 &act_pedit_ops, bind, flags);
 194                 if (ret) {
 195                         tcf_idr_cleanup(tn, index);
 196                         return ret;
 197                 }
 198                 ret = ACT_P_CREATED;
 199         } else if (err > 0) {
 200                 if (bind)
 201                         return 0;
 202                 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 203                         ret = -EEXIST;
 204                         goto out_release;
 205                 }
 206         } else {
 207                 return err;
 208         }
 209
 210         if (!parm->nkeys) {
 211                 NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
 212                 ret = -EINVAL;
 213                 goto out_release;
 214         }
 215         ksize = parm->nkeys * sizeof(struct tc_pedit_key);
 216         if (nla_len(pattr) < sizeof(*parm) + ksize) {
 217                 NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
 218                 ret = -EINVAL;
 219                 goto out_release;
 220         }
 221
 222         nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
 223         if (!nparms) {
 224                 ret = -ENOMEM;
 225                 goto out_release;
 226         }
 227
 228         nparms->tcfp_keys_ex =
 229                 tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys, extack);
 230         if (IS_ERR(nparms->tcfp_keys_ex)) {
 231                 ret = PTR_ERR(nparms->tcfp_keys_ex);
 232                 goto out_free;
 233         }
 234
 235         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 236         if (err < 0) {
 237                 ret = err;
 238                 goto out_free_ex;
 239         }
 240
 241         nparms->tcfp_off_max_hint = 0;
 242         nparms->tcfp_flags = parm->flags;
 243         nparms->tcfp_nkeys = parm->nkeys;
 244
 245         nparms->tcfp_keys = kmalloc(ksize, GFP_KERNEL);
 246         if (!nparms->tcfp_keys) {
 247                 ret = -ENOMEM;
 248                 goto put_chain;
 249         }
 250
 251         memcpy(nparms->tcfp_keys, parm->keys, ksize);
 252
 253         for (i = 0; i < nparms->tcfp_nkeys; ++i) {
 254                 u32 offmask = nparms->tcfp_keys[i].offmask;
 255                 u32 cur = nparms->tcfp_keys[i].off;
 256
 257                 /* The AT option can be added to static offsets in the datapath */
 258                 if (!offmask && cur % 4) {
 259                         NL_SET_ERR_MSG_MOD(extack, "Offsets must be on 32bit boundaries");
 260                         ret = -EINVAL;
 261                         goto out_free_keys;
 262                 }
 263
 264                 /* sanitize the shift value for any later use */
 265                 nparms->tcfp_keys[i].shift = min_t(size_t,
 266                                                    BITS_PER_TYPE(int) - 1,
 267                                                    nparms->tcfp_keys[i].shift);
 268
 269                 /* The AT option can read a single byte, we can bound the actual
 270                  * value with uchar max.
 271                  */
 272                 cur += (0xff & offmask) >> nparms->tcfp_keys[i].shift;
 273
 274                 /* Each key touches 4 bytes starting from the computed offset */
 275                 nparms->tcfp_off_max_hint =
 276                         max(nparms->tcfp_off_max_hint, cur + 4);
 277         }
 278
 279         p = to_pedit(*a);
 280
 281         spin_lock_bh(&p->tcf_lock);
 282         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 283         oparms = rcu_replace_pointer(p->parms, nparms, 1);
 284         spin_unlock_bh(&p->tcf_lock);
 285
 286         if (oparms)
 287                 call_rcu(&oparms->rcu, tcf_pedit_cleanup_rcu);
 288
 289         if (goto_ch)
 290                 tcf_chain_put_by_act(goto_ch);
 291
 292         return ret;
 293
 294 out_free_keys:
 295         kfree(nparms->tcfp_keys);
 296 put_chain:
 297         if (goto_ch)
 298                 tcf_chain_put_by_act(goto_ch);
 299 out_free_ex:
 300         kfree(nparms->tcfp_keys_ex);
 301 out_free:
 302         kfree(nparms);
 303 out_release:
 304         tcf_idr_release(*a, bind);
 305         return ret;
 306 }
 307
 308 static void tcf_pedit_cleanup(struct tc_action *a)
 309 {
 310         struct tcf_pedit *p = to_pedit(a);
 311         struct tcf_pedit_parms *parms;
 312
 313         parms = rcu_dereference_protected(p->parms, 1);
 314
 315         if (parms)
 316                 call_rcu(&parms->rcu, tcf_pedit_cleanup_rcu);
 317 }
 318
 319 static bool offset_valid(struct sk_buff *skb, int offset)
 320 {
 321         if (offset > 0 && offset > skb->len)
 322                 return false;
 323
 324         if  (offset < 0 && -offset > skb_headroom(skb))
 325                 return false;
 326
 327         return true;
 328 }
 329
 330 static void pedit_skb_hdr_offset(struct sk_buff *skb,
 331                                  enum pedit_header_type htype, int *hoffset)
 332 {
 333         /* 'htype' is validated in the netlink parsing */
 334         switch (htype) {
 335         case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
 336                 if (skb_mac_header_was_set(skb))
 337                         *hoffset = skb_mac_offset(skb);
 338                 break;
 339         case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
 340         case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
 341         case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
 342                 *hoffset = skb_network_offset(skb);
 343                 break;
 344         case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
 345         case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
 346                 if (skb_transport_header_was_set(skb))
 347                         *hoffset = skb_transport_offset(skb);
 348                 break;
 349         default:
 350                 break;
 351         }
 352 }
 353
 354 TC_INDIRECT_SCOPE int tcf_pedit_act(struct sk_buff *skb,
 355                                     const struct tc_action *a,
 356                                     struct tcf_result *res)
 357 {
 358         enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
 359         enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
 360         struct tcf_pedit *p = to_pedit(a);
 361         struct tcf_pedit_key_ex *tkey_ex;
 362         struct tcf_pedit_parms *parms;
 363         struct tc_pedit_key *tkey;
 364         u32 max_offset;
 365         int i;
 366
 367         parms = rcu_dereference_bh(p->parms);
 368
 369         max_offset = (skb_transport_header_was_set(skb) ?
 370                       skb_transport_offset(skb) :
 371                       skb_network_offset(skb)) +
 372                      parms->tcfp_off_max_hint;
 373         if (skb_ensure_writable(skb, min(skb->len, max_offset)))
 374                 goto done;
 375
 376         tcf_lastuse_update(&p->tcf_tm);
 377         tcf_action_update_bstats(&p->common, skb);
 378
 379         tkey = parms->tcfp_keys;
 380         tkey_ex = parms->tcfp_keys_ex;
 381
 382         for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) {
 383                 int offset = tkey->off;
 384                 int hoffset = 0;
 385                 u32 *ptr, hdata;
 386                 u32 val;
 387
 388                 if (tkey_ex) {
 389                         htype = tkey_ex->htype;
 390                         cmd = tkey_ex->cmd;
 391
 392                         tkey_ex++;
 393                 }
 394
 395                 pedit_skb_hdr_offset(skb, htype, &hoffset);
 396
 397                 if (tkey->offmask) {
 398                         u8 *d, _d;
 399
 400                         if (!offset_valid(skb, hoffset + tkey->at)) {
 401                                 pr_info_ratelimited("tc action pedit 'at' offset %d out of bounds\n",
 402                                                     hoffset + tkey->at);
 403                                 goto bad;
 404                         }
 405                         d = skb_header_pointer(skb, hoffset + tkey->at,
 406                                                sizeof(_d), &_d);
 407                         if (!d)
 408                                 goto bad;
 409
 410                         offset += (*d & tkey->offmask) >> tkey->shift;
 411                         if (offset % 4) {
 412                                 pr_info_ratelimited("tc action pedit offset must be on 32 bit boundaries\n");
 413                                 goto bad;
 414                         }
 415                 }
 416
 417                 if (!offset_valid(skb, hoffset + offset)) {
 418                         pr_info_ratelimited("tc action pedit offset %d out of bounds\n", hoffset + offset);
 419                         goto bad;
 420                 }
 421
 422                 ptr = skb_header_pointer(skb, hoffset + offset,
 423                                          sizeof(hdata), &hdata);
 424                 if (!ptr)
 425                         goto bad;
 426                 /* just do it, baby */
 427                 switch (cmd) {
 428                 case TCA_PEDIT_KEY_EX_CMD_SET:
 429                         val = tkey->val;
 430                         break;
 431                 case TCA_PEDIT_KEY_EX_CMD_ADD:
 432                         val = (*ptr + tkey->val) & ~tkey->mask;
 433                         break;
 434                 default:
 435                         pr_info_ratelimited("tc action pedit bad command (%d)\n", cmd);
 436                         goto bad;
 437                 }
 438
 439                 *ptr = ((*ptr & tkey->mask) ^ val);
 440                 if (ptr == &hdata)
 441                         skb_store_bits(skb, hoffset + offset, ptr, 4);
 442         }
 443
 444         goto done;
 445
 446 bad:
 447         tcf_action_inc_overlimit_qstats(&p->common);
 448 done:
 449         return p->tcf_action;
 450 }
 451
 452 static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets,
 453                                    u64 drops, u64 lastuse, bool hw)
 454 {
 455         struct tcf_pedit *d = to_pedit(a);
 456         struct tcf_t *tm = &d->tcf_tm;
 457
 458         tcf_action_update_stats(a, bytes, packets, drops, hw);
 459         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 460 }
 461
 462 static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
 463                           int bind, int ref)
 464 {
 465         unsigned char *b = skb_tail_pointer(skb);
 466         struct tcf_pedit *p = to_pedit(a);
 467         struct tcf_pedit_parms *parms;
 468         struct tc_pedit *opt;
 469         struct tcf_t t;
 470         int s;
 471
 472         spin_lock_bh(&p->tcf_lock);
 473         parms = rcu_dereference_protected(p->parms, 1);
 474         s = struct_size(opt, keys, parms->tcfp_nkeys);
 475
 476         opt = kzalloc(s, GFP_ATOMIC);
 477         if (unlikely(!opt)) {
 478                 spin_unlock_bh(&p->tcf_lock);
 479                 return -ENOBUFS;
 480         }
 481
 482         memcpy(opt->keys, parms->tcfp_keys,
 483                flex_array_size(opt, keys, parms->tcfp_nkeys));
 484         opt->index = p->tcf_index;
 485         opt->nkeys = parms->tcfp_nkeys;
 486         opt->flags = parms->tcfp_flags;
 487         opt->action = p->tcf_action;
 488         opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
 489         opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
 490
 491         if (parms->tcfp_keys_ex) {
 492                 if (tcf_pedit_key_ex_dump(skb, parms->tcfp_keys_ex,
 493                                           parms->tcfp_nkeys))
 494                         goto nla_put_failure;
 495
 496                 if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
 497                         goto nla_put_failure;
 498         } else {
 499                 if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
 500                         goto nla_put_failure;
 501         }
 502
 503         tcf_tm_dump(&t, &p->tcf_tm);
 504         if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
 505                 goto nla_put_failure;
 506         spin_unlock_bh(&p->tcf_lock);
 507
 508         kfree(opt);
 509         return skb->len;
 510
 511 nla_put_failure:
 512         spin_unlock_bh(&p->tcf_lock);
 513         nlmsg_trim(skb, b);
 514         kfree(opt);
 515         return -1;
 516 }
 517
 518 static int tcf_pedit_offload_act_setup(struct tc_action *act, void *entry_data,
 519                                        u32 *index_inc, bool bind,
 520                                        struct netlink_ext_ack *extack)
 521 {
 522         if (bind) {
 523                 struct flow_action_entry *entry = entry_data;
 524                 int k;
 525
 526                 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
 527                         switch (tcf_pedit_cmd(act, k)) {
 528                         case TCA_PEDIT_KEY_EX_CMD_SET:
 529                                 entry->id = FLOW_ACTION_MANGLE;
 530                                 break;
 531                         case TCA_PEDIT_KEY_EX_CMD_ADD:
 532                                 entry->id = FLOW_ACTION_ADD;
 533                                 break;
 534                         default:
 535                                 NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
 536                                 return -EOPNOTSUPP;
 537                         }
 538                         entry->mangle.htype = tcf_pedit_htype(act, k);
 539                         entry->mangle.mask = tcf_pedit_mask(act, k);
 540                         entry->mangle.val = tcf_pedit_val(act, k);
 541                         entry->mangle.offset = tcf_pedit_offset(act, k);
 542                         entry->hw_stats = tc_act_hw_stats(act->hw_stats);
 543                         entry++;
 544                 }
 545                 *index_inc = k;
 546         } else {
 547                 struct flow_offload_action *fl_action = entry_data;
 548                 u32 cmd = tcf_pedit_cmd(act, 0);
 549                 int k;
 550
 551                 switch (cmd) {
 552                 case TCA_PEDIT_KEY_EX_CMD_SET:
 553                         fl_action->id = FLOW_ACTION_MANGLE;
 554                         break;
 555                 case TCA_PEDIT_KEY_EX_CMD_ADD:
 556                         fl_action->id = FLOW_ACTION_ADD;
 557                         break;
 558                 default:
 559                         NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
 560                         return -EOPNOTSUPP;
 561                 }
 562
 563                 for (k = 1; k < tcf_pedit_nkeys(act); k++) {
 564                         if (cmd != tcf_pedit_cmd(act, k)) {
 565                                 NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
 566                                 return -EOPNOTSUPP;
 567                         }
 568                 }
 569         }
 570
 571         return 0;
 572 }
 573
 574 static struct tc_action_ops act_pedit_ops = {
 575         .kind           =       "pedit",
 576         .id             =       TCA_ID_PEDIT,
 577         .owner          =       THIS_MODULE,
 578         .act            =       tcf_pedit_act,
 579         .stats_update   =       tcf_pedit_stats_update,
 580         .dump           =       tcf_pedit_dump,
 581         .cleanup        =       tcf_pedit_cleanup,
 582         .init           =       tcf_pedit_init,
 583         .offload_act_setup =    tcf_pedit_offload_act_setup,
 584         .size           =       sizeof(struct tcf_pedit),
 585 };
 586
 587 static __net_init int pedit_init_net(struct net *net)
 588 {
 589         struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
 590
 591         return tc_action_net_init(net, tn, &act_pedit_ops);
 592 }
 593
 594 static void __net_exit pedit_exit_net(struct list_head *net_list)
 595 {
 596         tc_action_net_exit(net_list, act_pedit_ops.net_id);
 597 }
 598
 599 static struct pernet_operations pedit_net_ops = {
 600         .init = pedit_init_net,
 601         .exit_batch = pedit_exit_net,
 602         .id   = &act_pedit_ops.net_id,
 603         .size = sizeof(struct tc_action_net),
 604 };
 605
 606 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
 607 MODULE_DESCRIPTION("Generic Packet Editor actions");
 608 MODULE_LICENSE("GPL");
 609
 610 static int __init pedit_init_module(void)
 611 {
 612         return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
 613 }
 614
 615 static void __exit pedit_cleanup_module(void)
 616 {
 617         tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
 618 }
 619
 620 module_init(pedit_init_module);
 621 module_exit(pedit_cleanup_module);