net/sched/cls_flower.c

   1 /*
   2  * net/sched/cls_flower.c               Flower classifier
   3  *
   4  * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/rhashtable.h>
  16 #include <linux/workqueue.h>
  17
  18 #include <linux/if_ether.h>
  19 #include <linux/in6.h>
  20 #include <linux/ip.h>
  21
  22 #include <net/sch_generic.h>
  23 #include <net/pkt_cls.h>
  24 #include <net/ip.h>
  25 #include <net/flow_dissector.h>
  26
  27 struct fl_flow_key {
  28         int     indev_ifindex;
  29         struct flow_dissector_key_control control;
  30         struct flow_dissector_key_basic basic;
  31         struct flow_dissector_key_eth_addrs eth;
  32         struct flow_dissector_key_addrs ipaddrs;
  33         union {
  34                 struct flow_dissector_key_ipv4_addrs ipv4;
  35                 struct flow_dissector_key_ipv6_addrs ipv6;
  36         };
  37         struct flow_dissector_key_ports tp;
  38 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  39
  40 struct fl_flow_mask_range {
  41         unsigned short int start;
  42         unsigned short int end;
  43 };
  44
  45 struct fl_flow_mask {
  46         struct fl_flow_key key;
  47         struct fl_flow_mask_range range;
  48         struct rcu_head rcu;
  49 };
  50
  51 struct cls_fl_head {
  52         struct rhashtable ht;
  53         struct fl_flow_mask mask;
  54         struct flow_dissector dissector;
  55         u32 hgen;
  56         bool mask_assigned;
  57         struct list_head filters;
  58         struct rhashtable_params ht_params;
  59         union {
  60                 struct work_struct work;
  61                 struct rcu_head rcu;
  62         };
  63 };
  64
  65 struct cls_fl_filter {
  66         struct rhash_head ht_node;
  67         struct fl_flow_key mkey;
  68         struct tcf_exts exts;
  69         struct tcf_result res;
  70         struct fl_flow_key key;
  71         struct list_head list;
  72         u32 handle;
  73         struct rcu_head rcu;
  74 };
  75
  76 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
  77 {
  78         return mask->range.end - mask->range.start;
  79 }
  80
  81 static void fl_mask_update_range(struct fl_flow_mask *mask)
  82 {
  83         const u8 *bytes = (const u8 *) &mask->key;
  84         size_t size = sizeof(mask->key);
  85         size_t i, first = 0, last = size - 1;
  86
  87         for (i = 0; i < sizeof(mask->key); i++) {
  88                 if (bytes[i]) {
  89                         if (!first && i)
  90                                 first = i;
  91                         last = i;
  92                 }
  93         }
  94         mask->range.start = rounddown(first, sizeof(long));
  95         mask->range.end = roundup(last + 1, sizeof(long));
  96 }
  97
  98 static void *fl_key_get_start(struct fl_flow_key *key,
  99                               const struct fl_flow_mask *mask)
 100 {
 101         return (u8 *) key + mask->range.start;
 102 }
 103
 104 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
 105                               struct fl_flow_mask *mask)
 106 {
 107         const long *lkey = fl_key_get_start(key, mask);
 108         const long *lmask = fl_key_get_start(&mask->key, mask);
 109         long *lmkey = fl_key_get_start(mkey, mask);
 110         int i;
 111
 112         for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
 113                 *lmkey++ = *lkey++ & *lmask++;
 114 }
 115
 116 static void fl_clear_masked_range(struct fl_flow_key *key,
 117                                   struct fl_flow_mask *mask)
 118 {
 119         memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
 120 }
 121
 122 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 123                        struct tcf_result *res)
 124 {
 125         struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 126         struct cls_fl_filter *f;
 127         struct fl_flow_key skb_key;
 128         struct fl_flow_key skb_mkey;
 129
 130         flow_dissector_init_keys(&skb_key.control, &skb_key.basic);
 131         fl_clear_masked_range(&skb_key, &head->mask);
 132         skb_key.indev_ifindex = skb->skb_iif;
 133         /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
 134          * so do it rather here.
 135          */
 136         skb_key.basic.n_proto = skb->protocol;
 137         skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
 138
 139         fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
 140
 141         f = rhashtable_lookup_fast(&head->ht,
 142                                    fl_key_get_start(&skb_mkey, &head->mask),
 143                                    head->ht_params);
 144         if (f) {
 145                 *res = f->res;
 146                 return tcf_exts_exec(skb, &f->exts, res);
 147         }
 148         return -1;
 149 }
 150
 151 static int fl_init(struct tcf_proto *tp)
 152 {
 153         struct cls_fl_head *head;
 154
 155         head = kzalloc(sizeof(*head), GFP_KERNEL);
 156         if (!head)
 157                 return -ENOBUFS;
 158
 159         INIT_LIST_HEAD_RCU(&head->filters);
 160         rcu_assign_pointer(tp->root, head);
 161
 162         return 0;
 163 }
 164
 165 static void fl_destroy_filter(struct rcu_head *head)
 166 {
 167         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 168
 169         tcf_exts_destroy(&f->exts);
 170         kfree(f);
 171 }
 172
 173 static void fl_destroy_sleepable(struct work_struct *work)
 174 {
 175         struct cls_fl_head *head = container_of(work, struct cls_fl_head,
 176                                                 work);
 177         if (head->mask_assigned)
 178                 rhashtable_destroy(&head->ht);
 179         kfree(head);
 180         module_put(THIS_MODULE);
 181 }
 182
 183 static void fl_destroy_rcu(struct rcu_head *rcu)
 184 {
 185         struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
 186
 187         INIT_WORK(&head->work, fl_destroy_sleepable);
 188         schedule_work(&head->work);
 189 }
 190
 191 static bool fl_destroy(struct tcf_proto *tp, bool force)
 192 {
 193         struct cls_fl_head *head = rtnl_dereference(tp->root);
 194         struct cls_fl_filter *f, *next;
 195
 196         if (!force && !list_empty(&head->filters))
 197                 return false;
 198
 199         list_for_each_entry_safe(f, next, &head->filters, list) {
 200                 list_del_rcu(&f->list);
 201                 call_rcu(&f->rcu, fl_destroy_filter);
 202         }
 203
 204         __module_get(THIS_MODULE);
 205         call_rcu(&head->rcu, fl_destroy_rcu);
 206         return true;
 207 }
 208
 209 static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
 210 {
 211         struct cls_fl_head *head = rtnl_dereference(tp->root);
 212         struct cls_fl_filter *f;
 213
 214         list_for_each_entry(f, &head->filters, list)
 215                 if (f->handle == handle)
 216                         return (unsigned long) f;
 217         return 0;
 218 }
 219
 220 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 221         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 222         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 223         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 224                                             .len = IFNAMSIZ },
 225         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 226         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 227         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 228         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 229         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 230         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 231         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 232         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 233         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 234         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 235         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 236         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 237         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 238         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 239         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 240         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 241         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 242         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 243 };
 244
 245 static void fl_set_key_val(struct nlattr **tb,
 246                            void *val, int val_type,
 247                            void *mask, int mask_type, int len)
 248 {
 249         if (!tb[val_type])
 250                 return;
 251         memcpy(val, nla_data(tb[val_type]), len);
 252         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 253                 memset(mask, 0xff, len);
 254         else
 255                 memcpy(mask, nla_data(tb[mask_type]), len);
 256 }
 257
 258 static int fl_set_key(struct net *net, struct nlattr **tb,
 259                       struct fl_flow_key *key, struct fl_flow_key *mask)
 260 {
 261 #ifdef CONFIG_NET_CLS_IND
 262         if (tb[TCA_FLOWER_INDEV]) {
 263                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
 264                 if (err < 0)
 265                         return err;
 266                 key->indev_ifindex = err;
 267                 mask->indev_ifindex = 0xffffffff;
 268         }
 269 #endif
 270
 271         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 272                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 273                        sizeof(key->eth.dst));
 274         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 275                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 276                        sizeof(key->eth.src));
 277
 278         fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
 279                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 280                        sizeof(key->basic.n_proto));
 281
 282         if (key->basic.n_proto == htons(ETH_P_IP) ||
 283             key->basic.n_proto == htons(ETH_P_IPV6)) {
 284                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 285                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 286                                sizeof(key->basic.ip_proto));
 287         }
 288
 289         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 290                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 291                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 292                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 293                                sizeof(key->ipv4.src));
 294                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 295                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 296                                sizeof(key->ipv4.dst));
 297         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 298                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 299                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 300                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 301                                sizeof(key->ipv6.src));
 302                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 303                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 304                                sizeof(key->ipv6.dst));
 305         }
 306
 307         if (key->basic.ip_proto == IPPROTO_TCP) {
 308                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 309                                &mask->tp.src, TCA_FLOWER_UNSPEC,
 310                                sizeof(key->tp.src));
 311                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 312                                &mask->tp.dst, TCA_FLOWER_UNSPEC,
 313                                sizeof(key->tp.dst));
 314         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 315                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 316                                &mask->tp.src, TCA_FLOWER_UNSPEC,
 317                                sizeof(key->tp.src));
 318                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 319                                &mask->tp.dst, TCA_FLOWER_UNSPEC,
 320                                sizeof(key->tp.dst));
 321         }
 322
 323         return 0;
 324 }
 325
 326 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 327                        struct fl_flow_mask *mask2)
 328 {
 329         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 330         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 331
 332         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 333                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 334 }
 335
 336 static const struct rhashtable_params fl_ht_params = {
 337         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 338         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 339         .automatic_shrinking = true,
 340 };
 341
 342 static int fl_init_hashtable(struct cls_fl_head *head,
 343                              struct fl_flow_mask *mask)
 344 {
 345         head->ht_params = fl_ht_params;
 346         head->ht_params.key_len = fl_mask_range(mask);
 347         head->ht_params.key_offset += mask->range.start;
 348
 349         return rhashtable_init(&head->ht, &head->ht_params);
 350 }
 351
 352 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 353 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 354
 355 #define FL_KEY_IS_MASKED(mask, member)                                          \
 356         memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),               \
 357                    0, FL_KEY_MEMBER_SIZE(member))                               \
 358
 359 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 360         do {                                                                    \
 361                 keys[cnt].key_id = id;                                          \
 362                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 363                 cnt++;                                                          \
 364         } while(0);
 365
 366 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)                       \
 367         do {                                                                    \
 368                 if (FL_KEY_IS_MASKED(mask, member))                             \
 369                         FL_KEY_SET(keys, cnt, id, member);                      \
 370         } while(0);
 371
 372 static void fl_init_dissector(struct cls_fl_head *head,
 373                               struct fl_flow_mask *mask)
 374 {
 375         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 376         size_t cnt = 0;
 377
 378         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 379         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 380         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 381                              FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 382         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 383                              FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 384         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 385                              FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 386         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 387                              FLOW_DISSECTOR_KEY_PORTS, tp);
 388
 389         skb_flow_dissector_init(&head->dissector, keys, cnt);
 390 }
 391
 392 static int fl_check_assign_mask(struct cls_fl_head *head,
 393                                 struct fl_flow_mask *mask)
 394 {
 395         int err;
 396
 397         if (head->mask_assigned) {
 398                 if (!fl_mask_eq(&head->mask, mask))
 399                         return -EINVAL;
 400                 else
 401                         return 0;
 402         }
 403
 404         /* Mask is not assigned yet. So assign it and init hashtable
 405          * according to that.
 406          */
 407         err = fl_init_hashtable(head, mask);
 408         if (err)
 409                 return err;
 410         memcpy(&head->mask, mask, sizeof(head->mask));
 411         head->mask_assigned = true;
 412
 413         fl_init_dissector(head, mask);
 414
 415         return 0;
 416 }
 417
 418 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 419                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 420                         unsigned long base, struct nlattr **tb,
 421                         struct nlattr *est, bool ovr)
 422 {
 423         struct tcf_exts e;
 424         int err;
 425
 426         tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
 427         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 428         if (err < 0)
 429                 return err;
 430
 431         if (tb[TCA_FLOWER_CLASSID]) {
 432                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 433                 tcf_bind_filter(tp, &f->res, base);
 434         }
 435
 436         err = fl_set_key(net, tb, &f->key, &mask->key);
 437         if (err)
 438                 goto errout;
 439
 440         fl_mask_update_range(mask);
 441         fl_set_masked_key(&f->mkey, &f->key, mask);
 442
 443         tcf_exts_change(tp, &f->exts, &e);
 444
 445         return 0;
 446 errout:
 447         tcf_exts_destroy(&e);
 448         return err;
 449 }
 450
 451 static u32 fl_grab_new_handle(struct tcf_proto *tp,
 452                               struct cls_fl_head *head)
 453 {
 454         unsigned int i = 0x80000000;
 455         u32 handle;
 456
 457         do {
 458                 if (++head->hgen == 0x7FFFFFFF)
 459                         head->hgen = 1;
 460         } while (--i > 0 && fl_get(tp, head->hgen));
 461
 462         if (unlikely(i == 0)) {
 463                 pr_err("Insufficient number of handles\n");
 464                 handle = 0;
 465         } else {
 466                 handle = head->hgen;
 467         }
 468
 469         return handle;
 470 }
 471
 472 static int fl_change(struct net *net, struct sk_buff *in_skb,
 473                      struct tcf_proto *tp, unsigned long base,
 474                      u32 handle, struct nlattr **tca,
 475                      unsigned long *arg, bool ovr)
 476 {
 477         struct cls_fl_head *head = rtnl_dereference(tp->root);
 478         struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
 479         struct cls_fl_filter *fnew;
 480         struct nlattr *tb[TCA_FLOWER_MAX + 1];
 481         struct fl_flow_mask mask = {};
 482         int err;
 483
 484         if (!tca[TCA_OPTIONS])
 485                 return -EINVAL;
 486
 487         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
 488         if (err < 0)
 489                 return err;
 490
 491         if (fold && handle && fold->handle != handle)
 492                 return -EINVAL;
 493
 494         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 495         if (!fnew)
 496                 return -ENOBUFS;
 497
 498         tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 499
 500         if (!handle) {
 501                 handle = fl_grab_new_handle(tp, head);
 502                 if (!handle) {
 503                         err = -EINVAL;
 504                         goto errout;
 505                 }
 506         }
 507         fnew->handle = handle;
 508
 509         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
 510         if (err)
 511                 goto errout;
 512
 513         err = fl_check_assign_mask(head, &mask);
 514         if (err)
 515                 goto errout;
 516
 517         err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 518                                      head->ht_params);
 519         if (err)
 520                 goto errout;
 521         if (fold)
 522                 rhashtable_remove_fast(&head->ht, &fold->ht_node,
 523                                        head->ht_params);
 524
 525         *arg = (unsigned long) fnew;
 526
 527         if (fold) {
 528                 list_replace_rcu(&fold->list, &fnew->list);
 529                 tcf_unbind_filter(tp, &fold->res);
 530                 call_rcu(&fold->rcu, fl_destroy_filter);
 531         } else {
 532                 list_add_tail_rcu(&fnew->list, &head->filters);
 533         }
 534
 535         return 0;
 536
 537 errout:
 538         kfree(fnew);
 539         return err;
 540 }
 541
 542 static int fl_delete(struct tcf_proto *tp, unsigned long arg)
 543 {
 544         struct cls_fl_head *head = rtnl_dereference(tp->root);
 545         struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
 546
 547         rhashtable_remove_fast(&head->ht, &f->ht_node,
 548                                head->ht_params);
 549         list_del_rcu(&f->list);
 550         tcf_unbind_filter(tp, &f->res);
 551         call_rcu(&f->rcu, fl_destroy_filter);
 552         return 0;
 553 }
 554
 555 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 556 {
 557         struct cls_fl_head *head = rtnl_dereference(tp->root);
 558         struct cls_fl_filter *f;
 559
 560         list_for_each_entry_rcu(f, &head->filters, list) {
 561                 if (arg->count < arg->skip)
 562                         goto skip;
 563                 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
 564                         arg->stop = 1;
 565                         break;
 566                 }
 567 skip:
 568                 arg->count++;
 569         }
 570 }
 571
 572 static int fl_dump_key_val(struct sk_buff *skb,
 573                            void *val, int val_type,
 574                            void *mask, int mask_type, int len)
 575 {
 576         int err;
 577
 578         if (!memchr_inv(mask, 0, len))
 579                 return 0;
 580         err = nla_put(skb, val_type, len, val);
 581         if (err)
 582                 return err;
 583         if (mask_type != TCA_FLOWER_UNSPEC) {
 584                 err = nla_put(skb, mask_type, len, mask);
 585                 if (err)
 586                         return err;
 587         }
 588         return 0;
 589 }
 590
 591 static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 592                    struct sk_buff *skb, struct tcmsg *t)
 593 {
 594         struct cls_fl_head *head = rtnl_dereference(tp->root);
 595         struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
 596         struct nlattr *nest;
 597         struct fl_flow_key *key, *mask;
 598
 599         if (!f)
 600                 return skb->len;
 601
 602         t->tcm_handle = f->handle;
 603
 604         nest = nla_nest_start(skb, TCA_OPTIONS);
 605         if (!nest)
 606                 goto nla_put_failure;
 607
 608         if (f->res.classid &&
 609             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
 610                 goto nla_put_failure;
 611
 612         key = &f->key;
 613         mask = &head->mask.key;
 614
 615         if (mask->indev_ifindex) {
 616                 struct net_device *dev;
 617
 618                 dev = __dev_get_by_index(net, key->indev_ifindex);
 619                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
 620                         goto nla_put_failure;
 621         }
 622
 623         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 624                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 625                             sizeof(key->eth.dst)) ||
 626             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 627                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 628                             sizeof(key->eth.src)) ||
 629             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
 630                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 631                             sizeof(key->basic.n_proto)))
 632                 goto nla_put_failure;
 633         if ((key->basic.n_proto == htons(ETH_P_IP) ||
 634              key->basic.n_proto == htons(ETH_P_IPV6)) &&
 635             fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 636                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 637                             sizeof(key->basic.ip_proto)))
 638                 goto nla_put_failure;
 639
 640         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
 641             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 642                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 643                              sizeof(key->ipv4.src)) ||
 644              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 645                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 646                              sizeof(key->ipv4.dst))))
 647                 goto nla_put_failure;
 648         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
 649                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 650                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 651                                   sizeof(key->ipv6.src)) ||
 652                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 653                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 654                                   sizeof(key->ipv6.dst))))
 655                 goto nla_put_failure;
 656
 657         if (key->basic.ip_proto == IPPROTO_TCP &&
 658             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 659                              &mask->tp.src, TCA_FLOWER_UNSPEC,
 660                              sizeof(key->tp.src)) ||
 661              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 662                              &mask->tp.dst, TCA_FLOWER_UNSPEC,
 663                              sizeof(key->tp.dst))))
 664                 goto nla_put_failure;
 665         else if (key->basic.ip_proto == IPPROTO_UDP &&
 666                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 667                                   &mask->tp.src, TCA_FLOWER_UNSPEC,
 668                                   sizeof(key->tp.src)) ||
 669                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 670                                   &mask->tp.dst, TCA_FLOWER_UNSPEC,
 671                                   sizeof(key->tp.dst))))
 672                 goto nla_put_failure;
 673
 674         if (tcf_exts_dump(skb, &f->exts))
 675                 goto nla_put_failure;
 676
 677         nla_nest_end(skb, nest);
 678
 679         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
 680                 goto nla_put_failure;
 681
 682         return skb->len;
 683
 684 nla_put_failure:
 685         nla_nest_cancel(skb, nest);
 686         return -1;
 687 }
 688
 689 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
 690         .kind           = "flower",
 691         .classify       = fl_classify,
 692         .init           = fl_init,
 693         .destroy        = fl_destroy,
 694         .get            = fl_get,
 695         .change         = fl_change,
 696         .delete         = fl_delete,
 697         .walk           = fl_walk,
 698         .dump           = fl_dump,
 699         .owner          = THIS_MODULE,
 700 };
 701
 702 static int __init cls_fl_init(void)
 703 {
 704         return register_tcf_proto_ops(&cls_fl_ops);
 705 }
 706
 707 static void __exit cls_fl_exit(void)
 708 {
 709         unregister_tcf_proto_ops(&cls_fl_ops);
 710 }
 711
 712 module_init(cls_fl_init);
 713 module_exit(cls_fl_exit);
 714
 715 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
 716 MODULE_DESCRIPTION("Flower classifier");
 717 MODULE_LICENSE("GPL v2");