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   1 /*
   2  * net/sched/police.c   Input police filter.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *              J Hadi Salim (action changes)
  11  */
  12
  13 #include <asm/uaccess.h>
  14 #include <asm/system.h>
  15 #include <linux/bitops.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/mm.h>
  21 #include <linux/socket.h>
  22 #include <linux/sockios.h>
  23 #include <linux/in.h>
  24 #include <linux/errno.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/module.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/init.h>
  31 #include <net/sock.h>
  32 #include <net/act_api.h>
  33 #include <net/netlink.h>
  34
  35 #define L2T(p,L)   ((p)->tcfp_R_tab->data[(L)>>(p)->tcfp_R_tab->rate.cell_log])
  36 #define L2T_P(p,L) ((p)->tcfp_P_tab->data[(L)>>(p)->tcfp_P_tab->rate.cell_log])
  37
  38 #define POL_TAB_MASK     15
  39 static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
  40 static u32 police_idx_gen;
  41 static DEFINE_RWLOCK(police_lock);
  42
  43 static struct tcf_hashinfo police_hash_info = {
  44         .htab   =       tcf_police_ht,
  45         .hmask  =       POL_TAB_MASK,
  46         .lock   =       &police_lock,
  47 };
  48
  49 /* old policer structure from before tc actions */
  50 struct tc_police_compat
  51 {
  52         u32                     index;
  53         int                     action;
  54         u32                     limit;
  55         u32                     burst;
  56         u32                     mtu;
  57         struct tc_ratespec      rate;
  58         struct tc_ratespec      peakrate;
  59 };
  60
  61 /* Each policer is serialized by its individual spinlock */
  62
  63 #ifdef CONFIG_NET_CLS_ACT
  64 static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
  65                               int type, struct tc_action *a)
  66 {
  67         struct tcf_common *p;
  68         int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
  69         struct rtattr *r;
  70
  71         read_lock(&police_lock);
  72
  73         s_i = cb->args[0];
  74
  75         for (i = 0; i < (POL_TAB_MASK + 1); i++) {
  76                 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
  77
  78                 for (; p; p = p->tcfc_next) {
  79                         index++;
  80                         if (index < s_i)
  81                                 continue;
  82                         a->priv = p;
  83                         a->order = index;
  84                         r = (struct rtattr *)skb_tail_pointer(skb);
  85                         RTA_PUT(skb, a->order, 0, NULL);
  86                         if (type == RTM_DELACTION)
  87                                 err = tcf_action_dump_1(skb, a, 0, 1);
  88                         else
  89                                 err = tcf_action_dump_1(skb, a, 0, 0);
  90                         if (err < 0) {
  91                                 index--;
  92                                 nlmsg_trim(skb, r);
  93                                 goto done;
  94                         }
  95                         r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
  96                         n_i++;
  97                 }
  98         }
  99 done:
 100         read_unlock(&police_lock);
 101         if (n_i)
 102                 cb->args[0] += n_i;
 103         return n_i;
 104
 105 rtattr_failure:
 106         nlmsg_trim(skb, r);
 107         goto done;
 108 }
 109 #endif
 110
 111 void tcf_police_destroy(struct tcf_police *p)
 112 {
 113         unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
 114         struct tcf_common **p1p;
 115
 116         for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
 117                 if (*p1p == &p->common) {
 118                         write_lock_bh(&police_lock);
 119                         *p1p = p->tcf_next;
 120                         write_unlock_bh(&police_lock);
 121                         gen_kill_estimator(&p->tcf_bstats,
 122                                            &p->tcf_rate_est);
 123                         if (p->tcfp_R_tab)
 124                                 qdisc_put_rtab(p->tcfp_R_tab);
 125                         if (p->tcfp_P_tab)
 126                                 qdisc_put_rtab(p->tcfp_P_tab);
 127                         kfree(p);
 128                         return;
 129                 }
 130         }
 131         BUG_TRAP(0);
 132 }
 133
 134 #ifdef CONFIG_NET_CLS_ACT
 135 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
 136                                  struct tc_action *a, int ovr, int bind)
 137 {
 138         unsigned h;
 139         int ret = 0, err;
 140         struct rtattr *tb[TCA_POLICE_MAX];
 141         struct tc_police *parm;
 142         struct tcf_police *police;
 143         struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
 144         int size;
 145
 146         if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 147                 return -EINVAL;
 148
 149         if (tb[TCA_POLICE_TBF-1] == NULL)
 150                 return -EINVAL;
 151         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 152         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 153                 return -EINVAL;
 154         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 155
 156         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 157             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 158                 return -EINVAL;
 159         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 160             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 161                 return -EINVAL;
 162
 163         if (parm->index) {
 164                 struct tcf_common *pc;
 165
 166                 pc = tcf_hash_lookup(parm->index, &police_hash_info);
 167                 if (pc != NULL) {
 168                         a->priv = pc;
 169                         police = to_police(pc);
 170                         if (bind) {
 171                                 police->tcf_bindcnt += 1;
 172                                 police->tcf_refcnt += 1;
 173                         }
 174                         if (ovr)
 175                                 goto override;
 176                         return ret;
 177                 }
 178         }
 179
 180         police = kzalloc(sizeof(*police), GFP_KERNEL);
 181         if (police == NULL)
 182                 return -ENOMEM;
 183         ret = ACT_P_CREATED;
 184         police->tcf_refcnt = 1;
 185         spin_lock_init(&police->tcf_lock);
 186         police->tcf_stats_lock = &police->tcf_lock;
 187         if (bind)
 188                 police->tcf_bindcnt = 1;
 189 override:
 190         if (parm->rate.rate) {
 191                 err = -ENOMEM;
 192                 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 193                 if (R_tab == NULL)
 194                         goto failure;
 195                 if (parm->peakrate.rate) {
 196                         P_tab = qdisc_get_rtab(&parm->peakrate,
 197                                                tb[TCA_POLICE_PEAKRATE-1]);
 198                         if (P_tab == NULL) {
 199                                 qdisc_put_rtab(R_tab);
 200                                 goto failure;
 201                         }
 202                 }
 203         }
 204         /* No failure allowed after this point */
 205         spin_lock_bh(&police->tcf_lock);
 206         if (R_tab != NULL) {
 207                 qdisc_put_rtab(police->tcfp_R_tab);
 208                 police->tcfp_R_tab = R_tab;
 209         }
 210         if (P_tab != NULL) {
 211                 qdisc_put_rtab(police->tcfp_P_tab);
 212                 police->tcfp_P_tab = P_tab;
 213         }
 214
 215         if (tb[TCA_POLICE_RESULT-1])
 216                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 217         police->tcfp_toks = police->tcfp_burst = parm->burst;
 218         police->tcfp_mtu = parm->mtu;
 219         if (police->tcfp_mtu == 0) {
 220                 police->tcfp_mtu = ~0;
 221                 if (police->tcfp_R_tab)
 222                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 223         }
 224         if (police->tcfp_P_tab)
 225                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 226         police->tcf_action = parm->action;
 227
 228         if (tb[TCA_POLICE_AVRATE-1])
 229                 police->tcfp_ewma_rate =
 230                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 231         if (est)
 232                 gen_replace_estimator(&police->tcf_bstats,
 233                                       &police->tcf_rate_est,
 234                                       police->tcf_stats_lock, est);
 235
 236         spin_unlock_bh(&police->tcf_lock);
 237         if (ret != ACT_P_CREATED)
 238                 return ret;
 239
 240         police->tcfp_t_c = psched_get_time();
 241         police->tcf_index = parm->index ? parm->index :
 242                 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
 243         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 244         write_lock_bh(&police_lock);
 245         police->tcf_next = tcf_police_ht[h];
 246         tcf_police_ht[h] = &police->common;
 247         write_unlock_bh(&police_lock);
 248
 249         a->priv = police;
 250         return ret;
 251
 252 failure:
 253         if (ret == ACT_P_CREATED)
 254                 kfree(police);
 255         return err;
 256 }
 257
 258 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
 259 {
 260         struct tcf_police *p = a->priv;
 261
 262         if (p != NULL)
 263                 return tcf_police_release(p, bind);
 264         return 0;
 265 }
 266
 267 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
 268                           struct tcf_result *res)
 269 {
 270         struct tcf_police *police = a->priv;
 271         psched_time_t now;
 272         long toks;
 273         long ptoks = 0;
 274
 275         spin_lock(&police->tcf_lock);
 276
 277         police->tcf_bstats.bytes += skb->len;
 278         police->tcf_bstats.packets++;
 279
 280         if (police->tcfp_ewma_rate &&
 281             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 282                 police->tcf_qstats.overlimits++;
 283                 spin_unlock(&police->tcf_lock);
 284                 return police->tcf_action;
 285         }
 286
 287         if (skb->len <= police->tcfp_mtu) {
 288                 if (police->tcfp_R_tab == NULL) {
 289                         spin_unlock(&police->tcf_lock);
 290                         return police->tcfp_result;
 291                 }
 292
 293                 now = psched_get_time();
 294                 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
 295                                             police->tcfp_burst);
 296                 if (police->tcfp_P_tab) {
 297                         ptoks = toks + police->tcfp_ptoks;
 298                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 299                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 300                         ptoks -= L2T_P(police, skb->len);
 301                 }
 302                 toks += police->tcfp_toks;
 303                 if (toks > (long)police->tcfp_burst)
 304                         toks = police->tcfp_burst;
 305                 toks -= L2T(police, skb->len);
 306                 if ((toks|ptoks) >= 0) {
 307                         police->tcfp_t_c = now;
 308                         police->tcfp_toks = toks;
 309                         police->tcfp_ptoks = ptoks;
 310                         spin_unlock(&police->tcf_lock);
 311                         return police->tcfp_result;
 312                 }
 313         }
 314
 315         police->tcf_qstats.overlimits++;
 316         spin_unlock(&police->tcf_lock);
 317         return police->tcf_action;
 318 }
 319
 320 static int
 321 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 322 {
 323         unsigned char *b = skb_tail_pointer(skb);
 324         struct tcf_police *police = a->priv;
 325         struct tc_police opt;
 326
 327         opt.index = police->tcf_index;
 328         opt.action = police->tcf_action;
 329         opt.mtu = police->tcfp_mtu;
 330         opt.burst = police->tcfp_burst;
 331         opt.refcnt = police->tcf_refcnt - ref;
 332         opt.bindcnt = police->tcf_bindcnt - bind;
 333         if (police->tcfp_R_tab)
 334                 opt.rate = police->tcfp_R_tab->rate;
 335         else
 336                 memset(&opt.rate, 0, sizeof(opt.rate));
 337         if (police->tcfp_P_tab)
 338                 opt.peakrate = police->tcfp_P_tab->rate;
 339         else
 340                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 341         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 342         if (police->tcfp_result)
 343                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 344                         &police->tcfp_result);
 345         if (police->tcfp_ewma_rate)
 346                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 347         return skb->len;
 348
 349 rtattr_failure:
 350         nlmsg_trim(skb, b);
 351         return -1;
 352 }
 353
 354 MODULE_AUTHOR("Alexey Kuznetsov");
 355 MODULE_DESCRIPTION("Policing actions");
 356 MODULE_LICENSE("GPL");
 357
 358 static struct tc_action_ops act_police_ops = {
 359         .kind           =       "police",
 360         .hinfo          =       &police_hash_info,
 361         .type           =       TCA_ID_POLICE,
 362         .capab          =       TCA_CAP_NONE,
 363         .owner          =       THIS_MODULE,
 364         .act            =       tcf_act_police,
 365         .dump           =       tcf_act_police_dump,
 366         .cleanup        =       tcf_act_police_cleanup,
 367         .lookup         =       tcf_hash_search,
 368         .init           =       tcf_act_police_locate,
 369         .walk           =       tcf_act_police_walker
 370 };
 371
 372 static int __init
 373 police_init_module(void)
 374 {
 375         return tcf_register_action(&act_police_ops);
 376 }
 377
 378 static void __exit
 379 police_cleanup_module(void)
 380 {
 381         tcf_unregister_action(&act_police_ops);
 382 }
 383
 384 module_init(police_init_module);
 385 module_exit(police_cleanup_module);
 386
 387 #else /* CONFIG_NET_CLS_ACT */
 388
 389 static struct tcf_common *tcf_police_lookup(u32 index)
 390 {
 391         struct tcf_hashinfo *hinfo = &police_hash_info;
 392         struct tcf_common *p;
 393
 394         read_lock(hinfo->lock);
 395         for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
 396              p = p->tcfc_next) {
 397                 if (p->tcfc_index == index)
 398                         break;
 399         }
 400         read_unlock(hinfo->lock);
 401
 402         return p;
 403 }
 404
 405 static u32 tcf_police_new_index(void)
 406 {
 407         u32 *idx_gen = &police_idx_gen;
 408         u32 val = *idx_gen;
 409
 410         do {
 411                 if (++val == 0)
 412                         val = 1;
 413         } while (tcf_police_lookup(val));
 414
 415         return (*idx_gen = val);
 416 }
 417
 418 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
 419 {
 420         unsigned int h;
 421         struct tcf_police *police;
 422         struct rtattr *tb[TCA_POLICE_MAX];
 423         struct tc_police *parm;
 424         int size;
 425
 426         if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 427                 return NULL;
 428
 429         if (tb[TCA_POLICE_TBF-1] == NULL)
 430                 return NULL;
 431         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 432         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 433                 return NULL;
 434
 435         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 436
 437         if (parm->index) {
 438                 struct tcf_common *pc;
 439
 440                 pc = tcf_police_lookup(parm->index);
 441                 if (pc) {
 442                         police = to_police(pc);
 443                         police->tcf_refcnt++;
 444                         return police;
 445                 }
 446         }
 447         police = kzalloc(sizeof(*police), GFP_KERNEL);
 448         if (unlikely(!police))
 449                 return NULL;
 450
 451         police->tcf_refcnt = 1;
 452         spin_lock_init(&police->tcf_lock);
 453         police->tcf_stats_lock = &police->tcf_lock;
 454         if (parm->rate.rate) {
 455                 police->tcfp_R_tab =
 456                         qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 457                 if (police->tcfp_R_tab == NULL)
 458                         goto failure;
 459                 if (parm->peakrate.rate) {
 460                         police->tcfp_P_tab =
 461                                 qdisc_get_rtab(&parm->peakrate,
 462                                                tb[TCA_POLICE_PEAKRATE-1]);
 463                         if (police->tcfp_P_tab == NULL)
 464                                 goto failure;
 465                 }
 466         }
 467         if (tb[TCA_POLICE_RESULT-1]) {
 468                 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 469                         goto failure;
 470                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 471         }
 472         if (tb[TCA_POLICE_AVRATE-1]) {
 473                 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
 474                         goto failure;
 475                 police->tcfp_ewma_rate =
 476                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 477         }
 478         police->tcfp_toks = police->tcfp_burst = parm->burst;
 479         police->tcfp_mtu = parm->mtu;
 480         if (police->tcfp_mtu == 0) {
 481                 police->tcfp_mtu = ~0;
 482                 if (police->tcfp_R_tab)
 483                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 484         }
 485         if (police->tcfp_P_tab)
 486                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 487         police->tcfp_t_c = psched_get_time();
 488         police->tcf_index = parm->index ? parm->index :
 489                 tcf_police_new_index();
 490         police->tcf_action = parm->action;
 491         if (est)
 492                 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
 493                                   police->tcf_stats_lock, est);
 494         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 495         write_lock_bh(&police_lock);
 496         police->tcf_next = tcf_police_ht[h];
 497         tcf_police_ht[h] = &police->common;
 498         write_unlock_bh(&police_lock);
 499         return police;
 500
 501 failure:
 502         if (police->tcfp_R_tab)
 503                 qdisc_put_rtab(police->tcfp_R_tab);
 504         kfree(police);
 505         return NULL;
 506 }
 507
 508 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
 509 {
 510         psched_time_t now;
 511         long toks;
 512         long ptoks = 0;
 513
 514         spin_lock(&police->tcf_lock);
 515
 516         police->tcf_bstats.bytes += skb->len;
 517         police->tcf_bstats.packets++;
 518
 519         if (police->tcfp_ewma_rate &&
 520             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 521                 police->tcf_qstats.overlimits++;
 522                 spin_unlock(&police->tcf_lock);
 523                 return police->tcf_action;
 524         }
 525         if (skb->len <= police->tcfp_mtu) {
 526                 if (police->tcfp_R_tab == NULL) {
 527                         spin_unlock(&police->tcf_lock);
 528                         return police->tcfp_result;
 529                 }
 530
 531                 now = psched_get_time();
 532                 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
 533                                             police->tcfp_burst);
 534                 if (police->tcfp_P_tab) {
 535                         ptoks = toks + police->tcfp_ptoks;
 536                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 537                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 538                         ptoks -= L2T_P(police, skb->len);
 539                 }
 540                 toks += police->tcfp_toks;
 541                 if (toks > (long)police->tcfp_burst)
 542                         toks = police->tcfp_burst;
 543                 toks -= L2T(police, skb->len);
 544                 if ((toks|ptoks) >= 0) {
 545                         police->tcfp_t_c = now;
 546                         police->tcfp_toks = toks;
 547                         police->tcfp_ptoks = ptoks;
 548                         spin_unlock(&police->tcf_lock);
 549                         return police->tcfp_result;
 550                 }
 551         }
 552
 553         police->tcf_qstats.overlimits++;
 554         spin_unlock(&police->tcf_lock);
 555         return police->tcf_action;
 556 }
 557 EXPORT_SYMBOL(tcf_police);
 558
 559 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
 560 {
 561         unsigned char *b = skb_tail_pointer(skb);
 562         struct tc_police opt;
 563
 564         opt.index = police->tcf_index;
 565         opt.action = police->tcf_action;
 566         opt.mtu = police->tcfp_mtu;
 567         opt.burst = police->tcfp_burst;
 568         if (police->tcfp_R_tab)
 569                 opt.rate = police->tcfp_R_tab->rate;
 570         else
 571                 memset(&opt.rate, 0, sizeof(opt.rate));
 572         if (police->tcfp_P_tab)
 573                 opt.peakrate = police->tcfp_P_tab->rate;
 574         else
 575                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 576         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 577         if (police->tcfp_result)
 578                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 579                         &police->tcfp_result);
 580         if (police->tcfp_ewma_rate)
 581                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 582         return skb->len;
 583
 584 rtattr_failure:
 585         nlmsg_trim(skb, b);
 586         return -1;
 587 }
 588
 589 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
 590 {
 591         struct gnet_dump d;
 592
 593         if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
 594                                          TCA_XSTATS, police->tcf_stats_lock,
 595                                          &d) < 0)
 596                 goto errout;
 597
 598         if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
 599             gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
 600             gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
 601                 goto errout;
 602
 603         if (gnet_stats_finish_copy(&d) < 0)
 604                 goto errout;
 605
 606         return 0;
 607
 608 errout:
 609         return -1;
 610 }
 611
 612 #endif /* CONFIG_NET_CLS_ACT */