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 #include <net/dst.h>
  27 #include <net/dst_metadata.h>
  28
  29 struct fl_flow_key {
  30         int     indev_ifindex;
  31         struct flow_dissector_key_control control;
  32         struct flow_dissector_key_control enc_control;
  33         struct flow_dissector_key_basic basic;
  34         struct flow_dissector_key_eth_addrs eth;
  35         struct flow_dissector_key_vlan vlan;
  36         union {
  37                 struct flow_dissector_key_ipv4_addrs ipv4;
  38                 struct flow_dissector_key_ipv6_addrs ipv6;
  39         };
  40         struct flow_dissector_key_ports tp;
  41         struct flow_dissector_key_keyid enc_key_id;
  42         union {
  43                 struct flow_dissector_key_ipv4_addrs enc_ipv4;
  44                 struct flow_dissector_key_ipv6_addrs enc_ipv6;
  45         };
  46         struct flow_dissector_key_ports enc_tp;
  47 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  48
  49 struct fl_flow_mask_range {
  50         unsigned short int start;
  51         unsigned short int end;
  52 };
  53
  54 struct fl_flow_mask {
  55         struct fl_flow_key key;
  56         struct fl_flow_mask_range range;
  57         struct rcu_head rcu;
  58 };
  59
  60 struct cls_fl_head {
  61         struct rhashtable ht;
  62         struct fl_flow_mask mask;
  63         struct flow_dissector dissector;
  64         u32 hgen;
  65         bool mask_assigned;
  66         struct list_head filters;
  67         struct rhashtable_params ht_params;
  68         struct rcu_head rcu;
  69 };
  70
  71 struct cls_fl_filter {
  72         struct rhash_head ht_node;
  73         struct fl_flow_key mkey;
  74         struct tcf_exts exts;
  75         struct tcf_result res;
  76         struct fl_flow_key key;
  77         struct list_head list;
  78         u32 handle;
  79         u32 flags;
  80         struct rcu_head rcu;
  81 };
  82
  83 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
  84 {
  85         return mask->range.end - mask->range.start;
  86 }
  87
  88 static void fl_mask_update_range(struct fl_flow_mask *mask)
  89 {
  90         const u8 *bytes = (const u8 *) &mask->key;
  91         size_t size = sizeof(mask->key);
  92         size_t i, first = 0, last = size - 1;
  93
  94         for (i = 0; i < sizeof(mask->key); i++) {
  95                 if (bytes[i]) {
  96                         if (!first && i)
  97                                 first = i;
  98                         last = i;
  99                 }
 100         }
 101         mask->range.start = rounddown(first, sizeof(long));
 102         mask->range.end = roundup(last + 1, sizeof(long));
 103 }
 104
 105 static void *fl_key_get_start(struct fl_flow_key *key,
 106                               const struct fl_flow_mask *mask)
 107 {
 108         return (u8 *) key + mask->range.start;
 109 }
 110
 111 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
 112                               struct fl_flow_mask *mask)
 113 {
 114         const long *lkey = fl_key_get_start(key, mask);
 115         const long *lmask = fl_key_get_start(&mask->key, mask);
 116         long *lmkey = fl_key_get_start(mkey, mask);
 117         int i;
 118
 119         for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
 120                 *lmkey++ = *lkey++ & *lmask++;
 121 }
 122
 123 static void fl_clear_masked_range(struct fl_flow_key *key,
 124                                   struct fl_flow_mask *mask)
 125 {
 126         memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
 127 }
 128
 129 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 130                        struct tcf_result *res)
 131 {
 132         struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 133         struct cls_fl_filter *f;
 134         struct fl_flow_key skb_key;
 135         struct fl_flow_key skb_mkey;
 136         struct ip_tunnel_info *info;
 137
 138         if (!atomic_read(&head->ht.nelems))
 139                 return -1;
 140
 141         fl_clear_masked_range(&skb_key, &head->mask);
 142
 143         info = skb_tunnel_info(skb);
 144         if (info) {
 145                 struct ip_tunnel_key *key = &info->key;
 146
 147                 switch (ip_tunnel_info_af(info)) {
 148                 case AF_INET:
 149                         skb_key.enc_ipv4.src = key->u.ipv4.src;
 150                         skb_key.enc_ipv4.dst = key->u.ipv4.dst;
 151                         break;
 152                 case AF_INET6:
 153                         skb_key.enc_ipv6.src = key->u.ipv6.src;
 154                         skb_key.enc_ipv6.dst = key->u.ipv6.dst;
 155                         break;
 156                 }
 157
 158                 skb_key.enc_key_id.keyid = tunnel_id_to_key32(key->tun_id);
 159                 skb_key.enc_tp.src = key->tp_src;
 160                 skb_key.enc_tp.dst = key->tp_dst;
 161         }
 162
 163         skb_key.indev_ifindex = skb->skb_iif;
 164         /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
 165          * so do it rather here.
 166          */
 167         skb_key.basic.n_proto = skb->protocol;
 168         skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
 169
 170         fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
 171
 172         f = rhashtable_lookup_fast(&head->ht,
 173                                    fl_key_get_start(&skb_mkey, &head->mask),
 174                                    head->ht_params);
 175         if (f && !tc_skip_sw(f->flags)) {
 176                 *res = f->res;
 177                 return tcf_exts_exec(skb, &f->exts, res);
 178         }
 179         return -1;
 180 }
 181
 182 static int fl_init(struct tcf_proto *tp)
 183 {
 184         struct cls_fl_head *head;
 185
 186         head = kzalloc(sizeof(*head), GFP_KERNEL);
 187         if (!head)
 188                 return -ENOBUFS;
 189
 190         INIT_LIST_HEAD_RCU(&head->filters);
 191         rcu_assign_pointer(tp->root, head);
 192
 193         return 0;
 194 }
 195
 196 static void fl_destroy_filter(struct rcu_head *head)
 197 {
 198         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 199
 200         tcf_exts_destroy(&f->exts);
 201         kfree(f);
 202 }
 203
 204 static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie)
 205 {
 206         struct net_device *dev = tp->q->dev_queue->dev;
 207         struct tc_cls_flower_offload offload = {0};
 208         struct tc_to_netdev tc;
 209
 210         if (!tc_should_offload(dev, tp, 0))
 211                 return;
 212
 213         offload.command = TC_CLSFLOWER_DESTROY;
 214         offload.cookie = cookie;
 215
 216         tc.type = TC_SETUP_CLSFLOWER;
 217         tc.cls_flower = &offload;
 218
 219         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
 220 }
 221
 222 static int fl_hw_replace_filter(struct tcf_proto *tp,
 223                                 struct flow_dissector *dissector,
 224                                 struct fl_flow_key *mask,
 225                                 struct fl_flow_key *key,
 226                                 struct tcf_exts *actions,
 227                                 unsigned long cookie, u32 flags)
 228 {
 229         struct net_device *dev = tp->q->dev_queue->dev;
 230         struct tc_cls_flower_offload offload = {0};
 231         struct tc_to_netdev tc;
 232         int err;
 233
 234         if (!tc_should_offload(dev, tp, flags))
 235                 return tc_skip_sw(flags) ? -EINVAL : 0;
 236
 237         offload.command = TC_CLSFLOWER_REPLACE;
 238         offload.cookie = cookie;
 239         offload.dissector = dissector;
 240         offload.mask = mask;
 241         offload.key = key;
 242         offload.exts = actions;
 243
 244         tc.type = TC_SETUP_CLSFLOWER;
 245         tc.cls_flower = &offload;
 246
 247         err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
 248                                             &tc);
 249
 250         if (tc_skip_sw(flags))
 251                 return err;
 252
 253         return 0;
 254 }
 255
 256 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 257 {
 258         struct net_device *dev = tp->q->dev_queue->dev;
 259         struct tc_cls_flower_offload offload = {0};
 260         struct tc_to_netdev tc;
 261
 262         if (!tc_should_offload(dev, tp, 0))
 263                 return;
 264
 265         offload.command = TC_CLSFLOWER_STATS;
 266         offload.cookie = (unsigned long)f;
 267         offload.exts = &f->exts;
 268
 269         tc.type = TC_SETUP_CLSFLOWER;
 270         tc.cls_flower = &offload;
 271
 272         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
 273 }
 274
 275 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
 276 {
 277         list_del_rcu(&f->list);
 278         fl_hw_destroy_filter(tp, (unsigned long)f);
 279         tcf_unbind_filter(tp, &f->res);
 280         call_rcu(&f->rcu, fl_destroy_filter);
 281 }
 282
 283 static bool fl_destroy(struct tcf_proto *tp, bool force)
 284 {
 285         struct cls_fl_head *head = rtnl_dereference(tp->root);
 286         struct cls_fl_filter *f, *next;
 287
 288         if (!force && !list_empty(&head->filters))
 289                 return false;
 290
 291         list_for_each_entry_safe(f, next, &head->filters, list)
 292                 __fl_delete(tp, f);
 293         RCU_INIT_POINTER(tp->root, NULL);
 294         if (head->mask_assigned)
 295                 rhashtable_destroy(&head->ht);
 296         kfree_rcu(head, rcu);
 297         return true;
 298 }
 299
 300 static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
 301 {
 302         struct cls_fl_head *head = rtnl_dereference(tp->root);
 303         struct cls_fl_filter *f;
 304
 305         list_for_each_entry(f, &head->filters, list)
 306                 if (f->handle == handle)
 307                         return (unsigned long) f;
 308         return 0;
 309 }
 310
 311 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 312         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 313         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 314         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 315                                             .len = IFNAMSIZ },
 316         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 317         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 318         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 319         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 320         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 321         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 322         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 323         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 324         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 325         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 326         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 327         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 328         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 329         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 330         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 331         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 332         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 333         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 334         [TCA_FLOWER_KEY_VLAN_ID]        = { .type = NLA_U16 },
 335         [TCA_FLOWER_KEY_VLAN_PRIO]      = { .type = NLA_U8 },
 336         [TCA_FLOWER_KEY_VLAN_ETH_TYPE]  = { .type = NLA_U16 },
 337         [TCA_FLOWER_KEY_ENC_KEY_ID]     = { .type = NLA_U32 },
 338         [TCA_FLOWER_KEY_ENC_IPV4_SRC]   = { .type = NLA_U32 },
 339         [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
 340         [TCA_FLOWER_KEY_ENC_IPV4_DST]   = { .type = NLA_U32 },
 341         [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
 342         [TCA_FLOWER_KEY_ENC_IPV6_SRC]   = { .len = sizeof(struct in6_addr) },
 343         [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
 344         [TCA_FLOWER_KEY_ENC_IPV6_DST]   = { .len = sizeof(struct in6_addr) },
 345         [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
 346         [TCA_FLOWER_KEY_TCP_SRC_MASK]   = { .type = NLA_U16 },
 347         [TCA_FLOWER_KEY_TCP_DST_MASK]   = { .type = NLA_U16 },
 348         [TCA_FLOWER_KEY_UDP_SRC_MASK]   = { .type = NLA_U16 },
 349         [TCA_FLOWER_KEY_UDP_DST_MASK]   = { .type = NLA_U16 },
 350         [TCA_FLOWER_KEY_SCTP_SRC_MASK]  = { .type = NLA_U16 },
 351         [TCA_FLOWER_KEY_SCTP_DST_MASK]  = { .type = NLA_U16 },
 352         [TCA_FLOWER_KEY_SCTP_SRC]       = { .type = NLA_U16 },
 353         [TCA_FLOWER_KEY_SCTP_DST]       = { .type = NLA_U16 },
 354         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT]       = { .type = NLA_U16 },
 355         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK]  = { .type = NLA_U16 },
 356         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT]       = { .type = NLA_U16 },
 357         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK]  = { .type = NLA_U16 },
 358 };
 359
 360 static void fl_set_key_val(struct nlattr **tb,
 361                            void *val, int val_type,
 362                            void *mask, int mask_type, int len)
 363 {
 364         if (!tb[val_type])
 365                 return;
 366         memcpy(val, nla_data(tb[val_type]), len);
 367         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 368                 memset(mask, 0xff, len);
 369         else
 370                 memcpy(mask, nla_data(tb[mask_type]), len);
 371 }
 372
 373 static void fl_set_key_vlan(struct nlattr **tb,
 374                             struct flow_dissector_key_vlan *key_val,
 375                             struct flow_dissector_key_vlan *key_mask)
 376 {
 377 #define VLAN_PRIORITY_MASK      0x7
 378
 379         if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
 380                 key_val->vlan_id =
 381                         nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
 382                 key_mask->vlan_id = VLAN_VID_MASK;
 383         }
 384         if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
 385                 key_val->vlan_priority =
 386                         nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
 387                         VLAN_PRIORITY_MASK;
 388                 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
 389         }
 390 }
 391
 392 static int fl_set_key(struct net *net, struct nlattr **tb,
 393                       struct fl_flow_key *key, struct fl_flow_key *mask)
 394 {
 395         __be16 ethertype;
 396 #ifdef CONFIG_NET_CLS_IND
 397         if (tb[TCA_FLOWER_INDEV]) {
 398                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
 399                 if (err < 0)
 400                         return err;
 401                 key->indev_ifindex = err;
 402                 mask->indev_ifindex = 0xffffffff;
 403         }
 404 #endif
 405
 406         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 407                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 408                        sizeof(key->eth.dst));
 409         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 410                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 411                        sizeof(key->eth.src));
 412
 413         if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
 414                 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
 415
 416                 if (ethertype == htons(ETH_P_8021Q)) {
 417                         fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
 418                         fl_set_key_val(tb, &key->basic.n_proto,
 419                                        TCA_FLOWER_KEY_VLAN_ETH_TYPE,
 420                                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 421                                        sizeof(key->basic.n_proto));
 422                 } else {
 423                         key->basic.n_proto = ethertype;
 424                         mask->basic.n_proto = cpu_to_be16(~0);
 425                 }
 426         }
 427
 428         if (key->basic.n_proto == htons(ETH_P_IP) ||
 429             key->basic.n_proto == htons(ETH_P_IPV6)) {
 430                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 431                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 432                                sizeof(key->basic.ip_proto));
 433         }
 434
 435         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 436                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 437                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 438                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 439                                sizeof(key->ipv4.src));
 440                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 441                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 442                                sizeof(key->ipv4.dst));
 443         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 444                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 445                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 446                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 447                                sizeof(key->ipv6.src));
 448                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 449                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 450                                sizeof(key->ipv6.dst));
 451         }
 452
 453         if (key->basic.ip_proto == IPPROTO_TCP) {
 454                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 455                                &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
 456                                sizeof(key->tp.src));
 457                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 458                                &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 459                                sizeof(key->tp.dst));
 460         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 461                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 462                                &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
 463                                sizeof(key->tp.src));
 464                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 465                                &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
 466                                sizeof(key->tp.dst));
 467         } else if (key->basic.ip_proto == IPPROTO_SCTP) {
 468                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
 469                                &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
 470                                sizeof(key->tp.src));
 471                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
 472                                &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
 473                                sizeof(key->tp.dst));
 474         }
 475
 476         if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
 477             tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
 478                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 479                 fl_set_key_val(tb, &key->enc_ipv4.src,
 480                                TCA_FLOWER_KEY_ENC_IPV4_SRC,
 481                                &mask->enc_ipv4.src,
 482                                TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
 483                                sizeof(key->enc_ipv4.src));
 484                 fl_set_key_val(tb, &key->enc_ipv4.dst,
 485                                TCA_FLOWER_KEY_ENC_IPV4_DST,
 486                                &mask->enc_ipv4.dst,
 487                                TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
 488                                sizeof(key->enc_ipv4.dst));
 489         }
 490
 491         if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] ||
 492             tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) {
 493                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 494                 fl_set_key_val(tb, &key->enc_ipv6.src,
 495                                TCA_FLOWER_KEY_ENC_IPV6_SRC,
 496                                &mask->enc_ipv6.src,
 497                                TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
 498                                sizeof(key->enc_ipv6.src));
 499                 fl_set_key_val(tb, &key->enc_ipv6.dst,
 500                                TCA_FLOWER_KEY_ENC_IPV6_DST,
 501                                &mask->enc_ipv6.dst,
 502                                TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
 503                                sizeof(key->enc_ipv6.dst));
 504         }
 505
 506         fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID,
 507                        &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC,
 508                        sizeof(key->enc_key_id.keyid));
 509
 510         fl_set_key_val(tb, &key->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
 511                        &mask->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
 512                        sizeof(key->enc_tp.src));
 513
 514         fl_set_key_val(tb, &key->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
 515                        &mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
 516                        sizeof(key->enc_tp.dst));
 517
 518         return 0;
 519 }
 520
 521 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 522                        struct fl_flow_mask *mask2)
 523 {
 524         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 525         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 526
 527         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 528                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 529 }
 530
 531 static const struct rhashtable_params fl_ht_params = {
 532         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 533         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 534         .automatic_shrinking = true,
 535 };
 536
 537 static int fl_init_hashtable(struct cls_fl_head *head,
 538                              struct fl_flow_mask *mask)
 539 {
 540         head->ht_params = fl_ht_params;
 541         head->ht_params.key_len = fl_mask_range(mask);
 542         head->ht_params.key_offset += mask->range.start;
 543
 544         return rhashtable_init(&head->ht, &head->ht_params);
 545 }
 546
 547 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 548 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 549
 550 #define FL_KEY_IS_MASKED(mask, member)                                          \
 551         memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),               \
 552                    0, FL_KEY_MEMBER_SIZE(member))                               \
 553
 554 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 555         do {                                                                    \
 556                 keys[cnt].key_id = id;                                          \
 557                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 558                 cnt++;                                                          \
 559         } while(0);
 560
 561 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)                       \
 562         do {                                                                    \
 563                 if (FL_KEY_IS_MASKED(mask, member))                             \
 564                         FL_KEY_SET(keys, cnt, id, member);                      \
 565         } while(0);
 566
 567 static void fl_init_dissector(struct cls_fl_head *head,
 568                               struct fl_flow_mask *mask)
 569 {
 570         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 571         size_t cnt = 0;
 572
 573         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 574         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 575         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 576                              FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 577         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 578                              FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 579         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 580                              FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 581         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 582                              FLOW_DISSECTOR_KEY_PORTS, tp);
 583         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 584                              FLOW_DISSECTOR_KEY_VLAN, vlan);
 585         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 586                              FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
 587         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 588                              FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
 589         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 590                              FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
 591         if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) ||
 592             FL_KEY_IS_MASKED(&mask->key, enc_ipv6))
 593                 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL,
 594                            enc_control);
 595         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 596                              FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
 597
 598         skb_flow_dissector_init(&head->dissector, keys, cnt);
 599 }
 600
 601 static int fl_check_assign_mask(struct cls_fl_head *head,
 602                                 struct fl_flow_mask *mask)
 603 {
 604         int err;
 605
 606         if (head->mask_assigned) {
 607                 if (!fl_mask_eq(&head->mask, mask))
 608                         return -EINVAL;
 609                 else
 610                         return 0;
 611         }
 612
 613         /* Mask is not assigned yet. So assign it and init hashtable
 614          * according to that.
 615          */
 616         err = fl_init_hashtable(head, mask);
 617         if (err)
 618                 return err;
 619         memcpy(&head->mask, mask, sizeof(head->mask));
 620         head->mask_assigned = true;
 621
 622         fl_init_dissector(head, mask);
 623
 624         return 0;
 625 }
 626
 627 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 628                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 629                         unsigned long base, struct nlattr **tb,
 630                         struct nlattr *est, bool ovr)
 631 {
 632         struct tcf_exts e;
 633         int err;
 634
 635         err = tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
 636         if (err < 0)
 637                 return err;
 638         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 639         if (err < 0)
 640                 goto errout;
 641
 642         if (tb[TCA_FLOWER_CLASSID]) {
 643                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 644                 tcf_bind_filter(tp, &f->res, base);
 645         }
 646
 647         err = fl_set_key(net, tb, &f->key, &mask->key);
 648         if (err)
 649                 goto errout;
 650
 651         fl_mask_update_range(mask);
 652         fl_set_masked_key(&f->mkey, &f->key, mask);
 653
 654         tcf_exts_change(tp, &f->exts, &e);
 655
 656         return 0;
 657 errout:
 658         tcf_exts_destroy(&e);
 659         return err;
 660 }
 661
 662 static u32 fl_grab_new_handle(struct tcf_proto *tp,
 663                               struct cls_fl_head *head)
 664 {
 665         unsigned int i = 0x80000000;
 666         u32 handle;
 667
 668         do {
 669                 if (++head->hgen == 0x7FFFFFFF)
 670                         head->hgen = 1;
 671         } while (--i > 0 && fl_get(tp, head->hgen));
 672
 673         if (unlikely(i == 0)) {
 674                 pr_err("Insufficient number of handles\n");
 675                 handle = 0;
 676         } else {
 677                 handle = head->hgen;
 678         }
 679
 680         return handle;
 681 }
 682
 683 static int fl_change(struct net *net, struct sk_buff *in_skb,
 684                      struct tcf_proto *tp, unsigned long base,
 685                      u32 handle, struct nlattr **tca,
 686                      unsigned long *arg, bool ovr)
 687 {
 688         struct cls_fl_head *head = rtnl_dereference(tp->root);
 689         struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
 690         struct cls_fl_filter *fnew;
 691         struct nlattr *tb[TCA_FLOWER_MAX + 1];
 692         struct fl_flow_mask mask = {};
 693         int err;
 694
 695         if (!tca[TCA_OPTIONS])
 696                 return -EINVAL;
 697
 698         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
 699         if (err < 0)
 700                 return err;
 701
 702         if (fold && handle && fold->handle != handle)
 703                 return -EINVAL;
 704
 705         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 706         if (!fnew)
 707                 return -ENOBUFS;
 708
 709         err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 710         if (err < 0)
 711                 goto errout;
 712
 713         if (!handle) {
 714                 handle = fl_grab_new_handle(tp, head);
 715                 if (!handle) {
 716                         err = -EINVAL;
 717                         goto errout;
 718                 }
 719         }
 720         fnew->handle = handle;
 721
 722         if (tb[TCA_FLOWER_FLAGS]) {
 723                 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 724
 725                 if (!tc_flags_valid(fnew->flags)) {
 726                         err = -EINVAL;
 727                         goto errout;
 728                 }
 729         }
 730
 731         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
 732         if (err)
 733                 goto errout;
 734
 735         err = fl_check_assign_mask(head, &mask);
 736         if (err)
 737                 goto errout;
 738
 739         if (!tc_skip_sw(fnew->flags)) {
 740                 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 741                                              head->ht_params);
 742                 if (err)
 743                         goto errout;
 744         }
 745
 746         err = fl_hw_replace_filter(tp,
 747                                    &head->dissector,
 748                                    &mask.key,
 749                                    &fnew->key,
 750                                    &fnew->exts,
 751                                    (unsigned long)fnew,
 752                                    fnew->flags);
 753         if (err)
 754                 goto errout;
 755
 756         if (fold) {
 757                 rhashtable_remove_fast(&head->ht, &fold->ht_node,
 758                                        head->ht_params);
 759                 fl_hw_destroy_filter(tp, (unsigned long)fold);
 760         }
 761
 762         *arg = (unsigned long) fnew;
 763
 764         if (fold) {
 765                 list_replace_rcu(&fold->list, &fnew->list);
 766                 tcf_unbind_filter(tp, &fold->res);
 767                 call_rcu(&fold->rcu, fl_destroy_filter);
 768         } else {
 769                 list_add_tail_rcu(&fnew->list, &head->filters);
 770         }
 771
 772         return 0;
 773
 774 errout:
 775         tcf_exts_destroy(&fnew->exts);
 776         kfree(fnew);
 777         return err;
 778 }
 779
 780 static int fl_delete(struct tcf_proto *tp, unsigned long arg)
 781 {
 782         struct cls_fl_head *head = rtnl_dereference(tp->root);
 783         struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
 784
 785         rhashtable_remove_fast(&head->ht, &f->ht_node,
 786                                head->ht_params);
 787         __fl_delete(tp, f);
 788         return 0;
 789 }
 790
 791 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 792 {
 793         struct cls_fl_head *head = rtnl_dereference(tp->root);
 794         struct cls_fl_filter *f;
 795
 796         list_for_each_entry_rcu(f, &head->filters, list) {
 797                 if (arg->count < arg->skip)
 798                         goto skip;
 799                 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
 800                         arg->stop = 1;
 801                         break;
 802                 }
 803 skip:
 804                 arg->count++;
 805         }
 806 }
 807
 808 static int fl_dump_key_val(struct sk_buff *skb,
 809                            void *val, int val_type,
 810                            void *mask, int mask_type, int len)
 811 {
 812         int err;
 813
 814         if (!memchr_inv(mask, 0, len))
 815                 return 0;
 816         err = nla_put(skb, val_type, len, val);
 817         if (err)
 818                 return err;
 819         if (mask_type != TCA_FLOWER_UNSPEC) {
 820                 err = nla_put(skb, mask_type, len, mask);
 821                 if (err)
 822                         return err;
 823         }
 824         return 0;
 825 }
 826
 827 static int fl_dump_key_vlan(struct sk_buff *skb,
 828                             struct flow_dissector_key_vlan *vlan_key,
 829                             struct flow_dissector_key_vlan *vlan_mask)
 830 {
 831         int err;
 832
 833         if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
 834                 return 0;
 835         if (vlan_mask->vlan_id) {
 836                 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
 837                                   vlan_key->vlan_id);
 838                 if (err)
 839                         return err;
 840         }
 841         if (vlan_mask->vlan_priority) {
 842                 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
 843                                  vlan_key->vlan_priority);
 844                 if (err)
 845                         return err;
 846         }
 847         return 0;
 848 }
 849
 850 static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 851                    struct sk_buff *skb, struct tcmsg *t)
 852 {
 853         struct cls_fl_head *head = rtnl_dereference(tp->root);
 854         struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
 855         struct nlattr *nest;
 856         struct fl_flow_key *key, *mask;
 857
 858         if (!f)
 859                 return skb->len;
 860
 861         t->tcm_handle = f->handle;
 862
 863         nest = nla_nest_start(skb, TCA_OPTIONS);
 864         if (!nest)
 865                 goto nla_put_failure;
 866
 867         if (f->res.classid &&
 868             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
 869                 goto nla_put_failure;
 870
 871         key = &f->key;
 872         mask = &head->mask.key;
 873
 874         if (mask->indev_ifindex) {
 875                 struct net_device *dev;
 876
 877                 dev = __dev_get_by_index(net, key->indev_ifindex);
 878                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
 879                         goto nla_put_failure;
 880         }
 881
 882         fl_hw_update_stats(tp, f);
 883
 884         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 885                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 886                             sizeof(key->eth.dst)) ||
 887             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 888                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 889                             sizeof(key->eth.src)) ||
 890             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
 891                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 892                             sizeof(key->basic.n_proto)))
 893                 goto nla_put_failure;
 894
 895         if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
 896                 goto nla_put_failure;
 897
 898         if ((key->basic.n_proto == htons(ETH_P_IP) ||
 899              key->basic.n_proto == htons(ETH_P_IPV6)) &&
 900             fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 901                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 902                             sizeof(key->basic.ip_proto)))
 903                 goto nla_put_failure;
 904
 905         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
 906             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 907                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 908                              sizeof(key->ipv4.src)) ||
 909              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 910                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 911                              sizeof(key->ipv4.dst))))
 912                 goto nla_put_failure;
 913         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
 914                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 915                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 916                                   sizeof(key->ipv6.src)) ||
 917                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 918                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 919                                   sizeof(key->ipv6.dst))))
 920                 goto nla_put_failure;
 921
 922         if (key->basic.ip_proto == IPPROTO_TCP &&
 923             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 924                              &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
 925                              sizeof(key->tp.src)) ||
 926              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 927                              &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 928                              sizeof(key->tp.dst))))
 929                 goto nla_put_failure;
 930         else if (key->basic.ip_proto == IPPROTO_UDP &&
 931                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 932                                   &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
 933                                   sizeof(key->tp.src)) ||
 934                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 935                                   &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
 936                                   sizeof(key->tp.dst))))
 937                 goto nla_put_failure;
 938         else if (key->basic.ip_proto == IPPROTO_SCTP &&
 939                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
 940                                   &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
 941                                   sizeof(key->tp.src)) ||
 942                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
 943                                   &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
 944                                   sizeof(key->tp.dst))))
 945                 goto nla_put_failure;
 946
 947         if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
 948             (fl_dump_key_val(skb, &key->enc_ipv4.src,
 949                             TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
 950                             TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
 951                             sizeof(key->enc_ipv4.src)) ||
 952              fl_dump_key_val(skb, &key->enc_ipv4.dst,
 953                              TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
 954                              TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
 955                              sizeof(key->enc_ipv4.dst))))
 956                 goto nla_put_failure;
 957         else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
 958                  (fl_dump_key_val(skb, &key->enc_ipv6.src,
 959                             TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
 960                             TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
 961                             sizeof(key->enc_ipv6.src)) ||
 962                  fl_dump_key_val(skb, &key->enc_ipv6.dst,
 963                                  TCA_FLOWER_KEY_ENC_IPV6_DST,
 964                                  &mask->enc_ipv6.dst,
 965                                  TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
 966                             sizeof(key->enc_ipv6.dst))))
 967                 goto nla_put_failure;
 968
 969         if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
 970                             &mask->enc_key_id, TCA_FLOWER_UNSPEC,
 971                             sizeof(key->enc_key_id)) ||
 972             fl_dump_key_val(skb, &key->enc_tp.src,
 973                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
 974                             &mask->enc_tp.src,
 975                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
 976                             sizeof(key->enc_tp.src)) ||
 977             fl_dump_key_val(skb, &key->enc_tp.dst,
 978                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
 979                             &mask->enc_tp.dst,
 980                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
 981                             sizeof(key->enc_tp.dst)))
 982                 goto nla_put_failure;
 983
 984         nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags);
 985
 986         if (tcf_exts_dump(skb, &f->exts))
 987                 goto nla_put_failure;
 988
 989         nla_nest_end(skb, nest);
 990
 991         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
 992                 goto nla_put_failure;
 993
 994         return skb->len;
 995
 996 nla_put_failure:
 997         nla_nest_cancel(skb, nest);
 998         return -1;
 999 }
1000
1001 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
1002         .kind           = "flower",
1003         .classify       = fl_classify,
1004         .init           = fl_init,
1005         .destroy        = fl_destroy,
1006         .get            = fl_get,
1007         .change         = fl_change,
1008         .delete         = fl_delete,
1009         .walk           = fl_walk,
1010         .dump           = fl_dump,
1011         .owner          = THIS_MODULE,
1012 };
1013
1014 static int __init cls_fl_init(void)
1015 {
1016         return register_tcf_proto_ops(&cls_fl_ops);
1017 }
1018
1019 static void __exit cls_fl_exit(void)
1020 {
1021         unregister_tcf_proto_ops(&cls_fl_ops);
1022 }
1023
1024 module_init(cls_fl_init);
1025 module_exit(cls_fl_exit);
1026
1027 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
1028 MODULE_DESCRIPTION("Flower classifier");
1029 MODULE_LICENSE("GPL v2");