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
  17 #include <linux/if_ether.h>
  18 #include <linux/in6.h>
  19 #include <linux/ip.h>
  20
  21 #include <net/sch_generic.h>
  22 #include <net/pkt_cls.h>
  23 #include <net/ip.h>
  24 #include <net/flow_dissector.h>
  25
  26 struct fl_flow_key {
  27         int     indev_ifindex;
  28         struct flow_dissector_key_control control;
  29         struct flow_dissector_key_basic basic;
  30         struct flow_dissector_key_eth_addrs eth;
  31         struct flow_dissector_key_addrs ipaddrs;
  32         union {
  33                 struct flow_dissector_key_ipv4_addrs ipv4;
  34                 struct flow_dissector_key_ipv6_addrs ipv6;
  35         };
  36         struct flow_dissector_key_ports tp;
  37 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  38
  39 struct fl_flow_mask_range {
  40         unsigned short int start;
  41         unsigned short int end;
  42 };
  43
  44 struct fl_flow_mask {
  45         struct fl_flow_key key;
  46         struct fl_flow_mask_range range;
  47         struct rcu_head rcu;
  48 };
  49
  50 struct cls_fl_head {
  51         struct rhashtable ht;
  52         struct fl_flow_mask mask;
  53         struct flow_dissector dissector;
  54         u32 hgen;
  55         bool mask_assigned;
  56         struct list_head filters;
  57         struct rhashtable_params ht_params;
  58         struct rcu_head rcu;
  59 };
  60
  61 struct cls_fl_filter {
  62         struct rhash_head ht_node;
  63         struct fl_flow_key mkey;
  64         struct tcf_exts exts;
  65         struct tcf_result res;
  66         struct fl_flow_key key;
  67         struct list_head list;
  68         u32 handle;
  69         struct rcu_head rcu;
  70 };
  71
  72 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
  73 {
  74         return mask->range.end - mask->range.start;
  75 }
  76
  77 static void fl_mask_update_range(struct fl_flow_mask *mask)
  78 {
  79         const u8 *bytes = (const u8 *) &mask->key;
  80         size_t size = sizeof(mask->key);
  81         size_t i, first = 0, last = size - 1;
  82
  83         for (i = 0; i < sizeof(mask->key); i++) {
  84                 if (bytes[i]) {
  85                         if (!first && i)
  86                                 first = i;
  87                         last = i;
  88                 }
  89         }
  90         mask->range.start = rounddown(first, sizeof(long));
  91         mask->range.end = roundup(last + 1, sizeof(long));
  92 }
  93
  94 static void *fl_key_get_start(struct fl_flow_key *key,
  95                               const struct fl_flow_mask *mask)
  96 {
  97         return (u8 *) key + mask->range.start;
  98 }
  99
 100 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
 101                               struct fl_flow_mask *mask)
 102 {
 103         const long *lkey = fl_key_get_start(key, mask);
 104         const long *lmask = fl_key_get_start(&mask->key, mask);
 105         long *lmkey = fl_key_get_start(mkey, mask);
 106         int i;
 107
 108         for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
 109                 *lmkey++ = *lkey++ & *lmask++;
 110 }
 111
 112 static void fl_clear_masked_range(struct fl_flow_key *key,
 113                                   struct fl_flow_mask *mask)
 114 {
 115         memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
 116 }
 117
 118 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 119                        struct tcf_result *res)
 120 {
 121         struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 122         struct cls_fl_filter *f;
 123         struct fl_flow_key skb_key;
 124         struct fl_flow_key skb_mkey;
 125
 126         fl_clear_masked_range(&skb_key, &head->mask);
 127         skb_key.indev_ifindex = skb->skb_iif;
 128         /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
 129          * so do it rather here.
 130          */
 131         skb_key.basic.n_proto = skb->protocol;
 132         skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
 133
 134         fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
 135
 136         f = rhashtable_lookup_fast(&head->ht,
 137                                    fl_key_get_start(&skb_mkey, &head->mask),
 138                                    head->ht_params);
 139         if (f) {
 140                 *res = f->res;
 141                 return tcf_exts_exec(skb, &f->exts, res);
 142         }
 143         return -1;
 144 }
 145
 146 static int fl_init(struct tcf_proto *tp)
 147 {
 148         struct cls_fl_head *head;
 149
 150         head = kzalloc(sizeof(*head), GFP_KERNEL);
 151         if (!head)
 152                 return -ENOBUFS;
 153
 154         INIT_LIST_HEAD_RCU(&head->filters);
 155         rcu_assign_pointer(tp->root, head);
 156
 157         return 0;
 158 }
 159
 160 static void fl_destroy_filter(struct rcu_head *head)
 161 {
 162         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 163
 164         tcf_exts_destroy(&f->exts);
 165         kfree(f);
 166 }
 167
 168 static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie)
 169 {
 170         struct net_device *dev = tp->q->dev_queue->dev;
 171         struct tc_cls_flower_offload offload = {0};
 172         struct tc_to_netdev tc;
 173
 174         if (!tc_should_offload(dev, 0))
 175                 return;
 176
 177         offload.command = TC_CLSFLOWER_DESTROY;
 178         offload.cookie = cookie;
 179
 180         tc.type = TC_SETUP_CLSFLOWER;
 181         tc.cls_flower = &offload;
 182
 183         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
 184 }
 185
 186 static void fl_hw_replace_filter(struct tcf_proto *tp,
 187                                  struct flow_dissector *dissector,
 188                                  struct fl_flow_key *mask,
 189                                  struct fl_flow_key *key,
 190                                  struct tcf_exts *actions,
 191                                  unsigned long cookie, u32 flags)
 192 {
 193         struct net_device *dev = tp->q->dev_queue->dev;
 194         struct tc_cls_flower_offload offload = {0};
 195         struct tc_to_netdev tc;
 196
 197         if (!tc_should_offload(dev, flags))
 198                 return;
 199
 200         offload.command = TC_CLSFLOWER_REPLACE;
 201         offload.cookie = cookie;
 202         offload.dissector = dissector;
 203         offload.mask = mask;
 204         offload.key = key;
 205         offload.exts = actions;
 206
 207         tc.type = TC_SETUP_CLSFLOWER;
 208         tc.cls_flower = &offload;
 209
 210         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
 211 }
 212
 213 static bool fl_destroy(struct tcf_proto *tp, bool force)
 214 {
 215         struct cls_fl_head *head = rtnl_dereference(tp->root);
 216         struct cls_fl_filter *f, *next;
 217
 218         if (!force && !list_empty(&head->filters))
 219                 return false;
 220
 221         list_for_each_entry_safe(f, next, &head->filters, list) {
 222                 fl_hw_destroy_filter(tp, (unsigned long)f);
 223                 list_del_rcu(&f->list);
 224                 call_rcu(&f->rcu, fl_destroy_filter);
 225         }
 226         RCU_INIT_POINTER(tp->root, NULL);
 227         if (head->mask_assigned)
 228                 rhashtable_destroy(&head->ht);
 229         kfree_rcu(head, rcu);
 230         return true;
 231 }
 232
 233 static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
 234 {
 235         struct cls_fl_head *head = rtnl_dereference(tp->root);
 236         struct cls_fl_filter *f;
 237
 238         list_for_each_entry(f, &head->filters, list)
 239                 if (f->handle == handle)
 240                         return (unsigned long) f;
 241         return 0;
 242 }
 243
 244 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 245         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 246         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 247         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 248                                             .len = IFNAMSIZ },
 249         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 250         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 251         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 252         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 253         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 254         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 255         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 256         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 257         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 258         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 259         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 260         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 261         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 262         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 263         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 264         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 265         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 266         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 267 };
 268
 269 static void fl_set_key_val(struct nlattr **tb,
 270                            void *val, int val_type,
 271                            void *mask, int mask_type, int len)
 272 {
 273         if (!tb[val_type])
 274                 return;
 275         memcpy(val, nla_data(tb[val_type]), len);
 276         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 277                 memset(mask, 0xff, len);
 278         else
 279                 memcpy(mask, nla_data(tb[mask_type]), len);
 280 }
 281
 282 static int fl_set_key(struct net *net, struct nlattr **tb,
 283                       struct fl_flow_key *key, struct fl_flow_key *mask)
 284 {
 285 #ifdef CONFIG_NET_CLS_IND
 286         if (tb[TCA_FLOWER_INDEV]) {
 287                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
 288                 if (err < 0)
 289                         return err;
 290                 key->indev_ifindex = err;
 291                 mask->indev_ifindex = 0xffffffff;
 292         }
 293 #endif
 294
 295         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 296                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 297                        sizeof(key->eth.dst));
 298         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 299                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 300                        sizeof(key->eth.src));
 301
 302         fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
 303                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 304                        sizeof(key->basic.n_proto));
 305
 306         if (key->basic.n_proto == htons(ETH_P_IP) ||
 307             key->basic.n_proto == htons(ETH_P_IPV6)) {
 308                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 309                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 310                                sizeof(key->basic.ip_proto));
 311         }
 312
 313         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 314                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 315                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 316                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 317                                sizeof(key->ipv4.src));
 318                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 319                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 320                                sizeof(key->ipv4.dst));
 321         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 322                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 323                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 324                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 325                                sizeof(key->ipv6.src));
 326                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 327                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 328                                sizeof(key->ipv6.dst));
 329         }
 330
 331         if (key->basic.ip_proto == IPPROTO_TCP) {
 332                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 333                                &mask->tp.src, TCA_FLOWER_UNSPEC,
 334                                sizeof(key->tp.src));
 335                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 336                                &mask->tp.dst, TCA_FLOWER_UNSPEC,
 337                                sizeof(key->tp.dst));
 338         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 339                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 340                                &mask->tp.src, TCA_FLOWER_UNSPEC,
 341                                sizeof(key->tp.src));
 342                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 343                                &mask->tp.dst, TCA_FLOWER_UNSPEC,
 344                                sizeof(key->tp.dst));
 345         }
 346
 347         return 0;
 348 }
 349
 350 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 351                        struct fl_flow_mask *mask2)
 352 {
 353         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 354         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 355
 356         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 357                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 358 }
 359
 360 static const struct rhashtable_params fl_ht_params = {
 361         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 362         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 363         .automatic_shrinking = true,
 364 };
 365
 366 static int fl_init_hashtable(struct cls_fl_head *head,
 367                              struct fl_flow_mask *mask)
 368 {
 369         head->ht_params = fl_ht_params;
 370         head->ht_params.key_len = fl_mask_range(mask);
 371         head->ht_params.key_offset += mask->range.start;
 372
 373         return rhashtable_init(&head->ht, &head->ht_params);
 374 }
 375
 376 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 377 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 378 #define FL_KEY_MEMBER_END_OFFSET(member)                                        \
 379         (FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member))
 380
 381 #define FL_KEY_IN_RANGE(mask, member)                                           \
 382         (FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end &&                   \
 383          FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start)
 384
 385 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 386         do {                                                                    \
 387                 keys[cnt].key_id = id;                                          \
 388                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 389                 cnt++;                                                          \
 390         } while(0);
 391
 392 #define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member)                     \
 393         do {                                                                    \
 394                 if (FL_KEY_IN_RANGE(mask, member))                              \
 395                         FL_KEY_SET(keys, cnt, id, member);                      \
 396         } while(0);
 397
 398 static void fl_init_dissector(struct cls_fl_head *head,
 399                               struct fl_flow_mask *mask)
 400 {
 401         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 402         size_t cnt = 0;
 403
 404         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 405         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 406         FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
 407                                FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 408         FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
 409                                FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 410         FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
 411                                FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 412         FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
 413                                FLOW_DISSECTOR_KEY_PORTS, tp);
 414
 415         skb_flow_dissector_init(&head->dissector, keys, cnt);
 416 }
 417
 418 static int fl_check_assign_mask(struct cls_fl_head *head,
 419                                 struct fl_flow_mask *mask)
 420 {
 421         int err;
 422
 423         if (head->mask_assigned) {
 424                 if (!fl_mask_eq(&head->mask, mask))
 425                         return -EINVAL;
 426                 else
 427                         return 0;
 428         }
 429
 430         /* Mask is not assigned yet. So assign it and init hashtable
 431          * according to that.
 432          */
 433         err = fl_init_hashtable(head, mask);
 434         if (err)
 435                 return err;
 436         memcpy(&head->mask, mask, sizeof(head->mask));
 437         head->mask_assigned = true;
 438
 439         fl_init_dissector(head, mask);
 440
 441         return 0;
 442 }
 443
 444 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 445                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 446                         unsigned long base, struct nlattr **tb,
 447                         struct nlattr *est, bool ovr)
 448 {
 449         struct tcf_exts e;
 450         int err;
 451
 452         tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
 453         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 454         if (err < 0)
 455                 return err;
 456
 457         if (tb[TCA_FLOWER_CLASSID]) {
 458                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 459                 tcf_bind_filter(tp, &f->res, base);
 460         }
 461
 462         err = fl_set_key(net, tb, &f->key, &mask->key);
 463         if (err)
 464                 goto errout;
 465
 466         fl_mask_update_range(mask);
 467         fl_set_masked_key(&f->mkey, &f->key, mask);
 468
 469         tcf_exts_change(tp, &f->exts, &e);
 470
 471         return 0;
 472 errout:
 473         tcf_exts_destroy(&e);
 474         return err;
 475 }
 476
 477 static u32 fl_grab_new_handle(struct tcf_proto *tp,
 478                               struct cls_fl_head *head)
 479 {
 480         unsigned int i = 0x80000000;
 481         u32 handle;
 482
 483         do {
 484                 if (++head->hgen == 0x7FFFFFFF)
 485                         head->hgen = 1;
 486         } while (--i > 0 && fl_get(tp, head->hgen));
 487
 488         if (unlikely(i == 0)) {
 489                 pr_err("Insufficient number of handles\n");
 490                 handle = 0;
 491         } else {
 492                 handle = head->hgen;
 493         }
 494
 495         return handle;
 496 }
 497
 498 static int fl_change(struct net *net, struct sk_buff *in_skb,
 499                      struct tcf_proto *tp, unsigned long base,
 500                      u32 handle, struct nlattr **tca,
 501                      unsigned long *arg, bool ovr)
 502 {
 503         struct cls_fl_head *head = rtnl_dereference(tp->root);
 504         struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
 505         struct cls_fl_filter *fnew;
 506         struct nlattr *tb[TCA_FLOWER_MAX + 1];
 507         struct fl_flow_mask mask = {};
 508         u32 flags = 0;
 509         int err;
 510
 511         if (!tca[TCA_OPTIONS])
 512                 return -EINVAL;
 513
 514         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
 515         if (err < 0)
 516                 return err;
 517
 518         if (fold && handle && fold->handle != handle)
 519                 return -EINVAL;
 520
 521         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 522         if (!fnew)
 523                 return -ENOBUFS;
 524
 525         tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 526
 527         if (!handle) {
 528                 handle = fl_grab_new_handle(tp, head);
 529                 if (!handle) {
 530                         err = -EINVAL;
 531                         goto errout;
 532                 }
 533         }
 534         fnew->handle = handle;
 535
 536         if (tb[TCA_FLOWER_FLAGS])
 537                 flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 538
 539         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
 540         if (err)
 541                 goto errout;
 542
 543         err = fl_check_assign_mask(head, &mask);
 544         if (err)
 545                 goto errout;
 546
 547         err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 548                                      head->ht_params);
 549         if (err)
 550                 goto errout;
 551
 552         fl_hw_replace_filter(tp,
 553                              &head->dissector,
 554                              &mask.key,
 555                              &fnew->key,
 556                              &fnew->exts,
 557                              (unsigned long)fnew,
 558                              flags);
 559
 560         if (fold) {
 561                 rhashtable_remove_fast(&head->ht, &fold->ht_node,
 562                                        head->ht_params);
 563                 fl_hw_destroy_filter(tp, (unsigned long)fold);
 564         }
 565
 566         *arg = (unsigned long) fnew;
 567
 568         if (fold) {
 569                 list_replace_rcu(&fold->list, &fnew->list);
 570                 tcf_unbind_filter(tp, &fold->res);
 571                 call_rcu(&fold->rcu, fl_destroy_filter);
 572         } else {
 573                 list_add_tail_rcu(&fnew->list, &head->filters);
 574         }
 575
 576         return 0;
 577
 578 errout:
 579         kfree(fnew);
 580         return err;
 581 }
 582
 583 static int fl_delete(struct tcf_proto *tp, unsigned long arg)
 584 {
 585         struct cls_fl_head *head = rtnl_dereference(tp->root);
 586         struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
 587
 588         rhashtable_remove_fast(&head->ht, &f->ht_node,
 589                                head->ht_params);
 590         list_del_rcu(&f->list);
 591         fl_hw_destroy_filter(tp, (unsigned long)f);
 592         tcf_unbind_filter(tp, &f->res);
 593         call_rcu(&f->rcu, fl_destroy_filter);
 594         return 0;
 595 }
 596
 597 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 598 {
 599         struct cls_fl_head *head = rtnl_dereference(tp->root);
 600         struct cls_fl_filter *f;
 601
 602         list_for_each_entry_rcu(f, &head->filters, list) {
 603                 if (arg->count < arg->skip)
 604                         goto skip;
 605                 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
 606                         arg->stop = 1;
 607                         break;
 608                 }
 609 skip:
 610                 arg->count++;
 611         }
 612 }
 613
 614 static int fl_dump_key_val(struct sk_buff *skb,
 615                            void *val, int val_type,
 616                            void *mask, int mask_type, int len)
 617 {
 618         int err;
 619
 620         if (!memchr_inv(mask, 0, len))
 621                 return 0;
 622         err = nla_put(skb, val_type, len, val);
 623         if (err)
 624                 return err;
 625         if (mask_type != TCA_FLOWER_UNSPEC) {
 626                 err = nla_put(skb, mask_type, len, mask);
 627                 if (err)
 628                         return err;
 629         }
 630         return 0;
 631 }
 632
 633 static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 634                    struct sk_buff *skb, struct tcmsg *t)
 635 {
 636         struct cls_fl_head *head = rtnl_dereference(tp->root);
 637         struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
 638         struct nlattr *nest;
 639         struct fl_flow_key *key, *mask;
 640
 641         if (!f)
 642                 return skb->len;
 643
 644         t->tcm_handle = f->handle;
 645
 646         nest = nla_nest_start(skb, TCA_OPTIONS);
 647         if (!nest)
 648                 goto nla_put_failure;
 649
 650         if (f->res.classid &&
 651             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
 652                 goto nla_put_failure;
 653
 654         key = &f->key;
 655         mask = &head->mask.key;
 656
 657         if (mask->indev_ifindex) {
 658                 struct net_device *dev;
 659
 660                 dev = __dev_get_by_index(net, key->indev_ifindex);
 661                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
 662                         goto nla_put_failure;
 663         }
 664
 665         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 666                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 667                             sizeof(key->eth.dst)) ||
 668             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 669                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 670                             sizeof(key->eth.src)) ||
 671             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
 672                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 673                             sizeof(key->basic.n_proto)))
 674                 goto nla_put_failure;
 675         if ((key->basic.n_proto == htons(ETH_P_IP) ||
 676              key->basic.n_proto == htons(ETH_P_IPV6)) &&
 677             fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 678                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 679                             sizeof(key->basic.ip_proto)))
 680                 goto nla_put_failure;
 681
 682         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
 683             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 684                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 685                              sizeof(key->ipv4.src)) ||
 686              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 687                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 688                              sizeof(key->ipv4.dst))))
 689                 goto nla_put_failure;
 690         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
 691                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 692                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 693                                   sizeof(key->ipv6.src)) ||
 694                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 695                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 696                                   sizeof(key->ipv6.dst))))
 697                 goto nla_put_failure;
 698
 699         if (key->basic.ip_proto == IPPROTO_TCP &&
 700             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 701                              &mask->tp.src, TCA_FLOWER_UNSPEC,
 702                              sizeof(key->tp.src)) ||
 703              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 704                              &mask->tp.dst, TCA_FLOWER_UNSPEC,
 705                              sizeof(key->tp.dst))))
 706                 goto nla_put_failure;
 707         else if (key->basic.ip_proto == IPPROTO_UDP &&
 708                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 709                                   &mask->tp.src, TCA_FLOWER_UNSPEC,
 710                                   sizeof(key->tp.src)) ||
 711                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 712                                   &mask->tp.dst, TCA_FLOWER_UNSPEC,
 713                                   sizeof(key->tp.dst))))
 714                 goto nla_put_failure;
 715
 716         if (tcf_exts_dump(skb, &f->exts))
 717                 goto nla_put_failure;
 718
 719         nla_nest_end(skb, nest);
 720
 721         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
 722                 goto nla_put_failure;
 723
 724         return skb->len;
 725
 726 nla_put_failure:
 727         nla_nest_cancel(skb, nest);
 728         return -1;
 729 }
 730
 731 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
 732         .kind           = "flower",
 733         .classify       = fl_classify,
 734         .init           = fl_init,
 735         .destroy        = fl_destroy,
 736         .get            = fl_get,
 737         .change         = fl_change,
 738         .delete         = fl_delete,
 739         .walk           = fl_walk,
 740         .dump           = fl_dump,
 741         .owner          = THIS_MODULE,
 742 };
 743
 744 static int __init cls_fl_init(void)
 745 {
 746         return register_tcf_proto_ops(&cls_fl_ops);
 747 }
 748
 749 static void __exit cls_fl_exit(void)
 750 {
 751         unregister_tcf_proto_ops(&cls_fl_ops);
 752 }
 753
 754 module_init(cls_fl_init);
 755 module_exit(cls_fl_exit);
 756
 757 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
 758 MODULE_DESCRIPTION("Flower classifier");
 759 MODULE_LICENSE("GPL v2");