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 #include <linux/mpls.h>
  22
  23 #include <net/sch_generic.h>
  24 #include <net/pkt_cls.h>
  25 #include <net/ip.h>
  26 #include <net/flow_dissector.h>
  27
  28 #include <net/dst.h>
  29 #include <net/dst_metadata.h>
  30
  31 struct fl_flow_key {
  32         int     indev_ifindex;
  33         struct flow_dissector_key_control control;
  34         struct flow_dissector_key_control enc_control;
  35         struct flow_dissector_key_basic basic;
  36         struct flow_dissector_key_eth_addrs eth;
  37         struct flow_dissector_key_vlan vlan;
  38         union {
  39                 struct flow_dissector_key_ipv4_addrs ipv4;
  40                 struct flow_dissector_key_ipv6_addrs ipv6;
  41         };
  42         struct flow_dissector_key_ports tp;
  43         struct flow_dissector_key_icmp icmp;
  44         struct flow_dissector_key_arp arp;
  45         struct flow_dissector_key_keyid enc_key_id;
  46         union {
  47                 struct flow_dissector_key_ipv4_addrs enc_ipv4;
  48                 struct flow_dissector_key_ipv6_addrs enc_ipv6;
  49         };
  50         struct flow_dissector_key_ports enc_tp;
  51         struct flow_dissector_key_mpls mpls;
  52         struct flow_dissector_key_tcp tcp;
  53         struct flow_dissector_key_ip ip;
  54 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  55
  56 struct fl_flow_mask_range {
  57         unsigned short int start;
  58         unsigned short int end;
  59 };
  60
  61 struct fl_flow_mask {
  62         struct fl_flow_key key;
  63         struct fl_flow_mask_range range;
  64         struct rcu_head rcu;
  65 };
  66
  67 struct cls_fl_head {
  68         struct rhashtable ht;
  69         struct fl_flow_mask mask;
  70         struct flow_dissector dissector;
  71         bool mask_assigned;
  72         struct list_head filters;
  73         struct rhashtable_params ht_params;
  74         union {
  75                 struct work_struct work;
  76                 struct rcu_head rcu;
  77         };
  78         struct idr handle_idr;
  79 };
  80
  81 struct cls_fl_filter {
  82         struct rhash_head ht_node;
  83         struct fl_flow_key mkey;
  84         struct tcf_exts exts;
  85         struct tcf_result res;
  86         struct fl_flow_key key;
  87         struct list_head list;
  88         u32 handle;
  89         u32 flags;
  90         union {
  91                 struct work_struct work;
  92                 struct rcu_head rcu;
  93         };
  94         struct net_device *hw_dev;
  95 };
  96
  97 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
  98 {
  99         return mask->range.end - mask->range.start;
 100 }
 101
 102 static void fl_mask_update_range(struct fl_flow_mask *mask)
 103 {
 104         const u8 *bytes = (const u8 *) &mask->key;
 105         size_t size = sizeof(mask->key);
 106         size_t i, first = 0, last = size - 1;
 107
 108         for (i = 0; i < sizeof(mask->key); i++) {
 109                 if (bytes[i]) {
 110                         if (!first && i)
 111                                 first = i;
 112                         last = i;
 113                 }
 114         }
 115         mask->range.start = rounddown(first, sizeof(long));
 116         mask->range.end = roundup(last + 1, sizeof(long));
 117 }
 118
 119 static void *fl_key_get_start(struct fl_flow_key *key,
 120                               const struct fl_flow_mask *mask)
 121 {
 122         return (u8 *) key + mask->range.start;
 123 }
 124
 125 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
 126                               struct fl_flow_mask *mask)
 127 {
 128         const long *lkey = fl_key_get_start(key, mask);
 129         const long *lmask = fl_key_get_start(&mask->key, mask);
 130         long *lmkey = fl_key_get_start(mkey, mask);
 131         int i;
 132
 133         for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
 134                 *lmkey++ = *lkey++ & *lmask++;
 135 }
 136
 137 static void fl_clear_masked_range(struct fl_flow_key *key,
 138                                   struct fl_flow_mask *mask)
 139 {
 140         memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
 141 }
 142
 143 static struct cls_fl_filter *fl_lookup(struct cls_fl_head *head,
 144                                        struct fl_flow_key *mkey)
 145 {
 146         return rhashtable_lookup_fast(&head->ht,
 147                                       fl_key_get_start(mkey, &head->mask),
 148                                       head->ht_params);
 149 }
 150
 151 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 152                        struct tcf_result *res)
 153 {
 154         struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 155         struct cls_fl_filter *f;
 156         struct fl_flow_key skb_key;
 157         struct fl_flow_key skb_mkey;
 158
 159         if (!atomic_read(&head->ht.nelems))
 160                 return -1;
 161
 162         fl_clear_masked_range(&skb_key, &head->mask);
 163
 164         skb_key.indev_ifindex = skb->skb_iif;
 165         /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
 166          * so do it rather here.
 167          */
 168         skb_key.basic.n_proto = skb->protocol;
 169         skb_flow_dissect_tunnel_info(skb, &head->dissector, &skb_key);
 170         skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
 171
 172         fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
 173
 174         f = fl_lookup(head, &skb_mkey);
 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         idr_init(&head->handle_idr);
 193
 194         return 0;
 195 }
 196
 197 static void __fl_destroy_filter(struct cls_fl_filter *f)
 198 {
 199         tcf_exts_destroy(&f->exts);
 200         tcf_exts_put_net(&f->exts);
 201         kfree(f);
 202 }
 203
 204 static void fl_destroy_filter_work(struct work_struct *work)
 205 {
 206         struct cls_fl_filter *f = container_of(work, struct cls_fl_filter, work);
 207
 208         rtnl_lock();
 209         __fl_destroy_filter(f);
 210         rtnl_unlock();
 211 }
 212
 213 static void fl_destroy_filter(struct rcu_head *head)
 214 {
 215         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 216
 217         INIT_WORK(&f->work, fl_destroy_filter_work);
 218         tcf_queue_work(&f->work);
 219 }
 220
 221 static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f,
 222                                  struct netlink_ext_ack *extack)
 223 {
 224         struct tc_cls_flower_offload cls_flower = {};
 225         struct tcf_block *block = tp->chain->block;
 226
 227         tc_cls_common_offload_init(&cls_flower.common, tp, f->flags, extack);
 228         cls_flower.command = TC_CLSFLOWER_DESTROY;
 229         cls_flower.cookie = (unsigned long) f;
 230
 231         tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 232                          &cls_flower, false);
 233         tcf_block_offload_dec(block, &f->flags);
 234 }
 235
 236 static int fl_hw_replace_filter(struct tcf_proto *tp,
 237                                 struct flow_dissector *dissector,
 238                                 struct fl_flow_key *mask,
 239                                 struct cls_fl_filter *f,
 240                                 struct netlink_ext_ack *extack)
 241 {
 242         struct tc_cls_flower_offload cls_flower = {};
 243         struct tcf_block *block = tp->chain->block;
 244         bool skip_sw = tc_skip_sw(f->flags);
 245         int err;
 246
 247         tc_cls_common_offload_init(&cls_flower.common, tp, f->flags, extack);
 248         cls_flower.command = TC_CLSFLOWER_REPLACE;
 249         cls_flower.cookie = (unsigned long) f;
 250         cls_flower.dissector = dissector;
 251         cls_flower.mask = mask;
 252         cls_flower.key = &f->mkey;
 253         cls_flower.exts = &f->exts;
 254         cls_flower.classid = f->res.classid;
 255
 256         err = tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 257                                &cls_flower, skip_sw);
 258         if (err < 0) {
 259                 fl_hw_destroy_filter(tp, f, NULL);
 260                 return err;
 261         } else if (err > 0) {
 262                 tcf_block_offload_inc(block, &f->flags);
 263         }
 264
 265         if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW))
 266                 return -EINVAL;
 267
 268         return 0;
 269 }
 270
 271 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 272 {
 273         struct tc_cls_flower_offload cls_flower = {};
 274         struct tcf_block *block = tp->chain->block;
 275
 276         tc_cls_common_offload_init(&cls_flower.common, tp, f->flags, NULL);
 277         cls_flower.command = TC_CLSFLOWER_STATS;
 278         cls_flower.cookie = (unsigned long) f;
 279         cls_flower.exts = &f->exts;
 280         cls_flower.classid = f->res.classid;
 281
 282         tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 283                          &cls_flower, false);
 284 }
 285
 286 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f,
 287                         struct netlink_ext_ack *extack)
 288 {
 289         struct cls_fl_head *head = rtnl_dereference(tp->root);
 290
 291         idr_remove(&head->handle_idr, f->handle);
 292         list_del_rcu(&f->list);
 293         if (!tc_skip_hw(f->flags))
 294                 fl_hw_destroy_filter(tp, f, extack);
 295         tcf_unbind_filter(tp, &f->res);
 296         if (tcf_exts_get_net(&f->exts))
 297                 call_rcu(&f->rcu, fl_destroy_filter);
 298         else
 299                 __fl_destroy_filter(f);
 300 }
 301
 302 static void fl_destroy_sleepable(struct work_struct *work)
 303 {
 304         struct cls_fl_head *head = container_of(work, struct cls_fl_head,
 305                                                 work);
 306         if (head->mask_assigned)
 307                 rhashtable_destroy(&head->ht);
 308         kfree(head);
 309         module_put(THIS_MODULE);
 310 }
 311
 312 static void fl_destroy_rcu(struct rcu_head *rcu)
 313 {
 314         struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
 315
 316         INIT_WORK(&head->work, fl_destroy_sleepable);
 317         schedule_work(&head->work);
 318 }
 319
 320 static void fl_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 321 {
 322         struct cls_fl_head *head = rtnl_dereference(tp->root);
 323         struct cls_fl_filter *f, *next;
 324
 325         list_for_each_entry_safe(f, next, &head->filters, list)
 326                 __fl_delete(tp, f, extack);
 327         idr_destroy(&head->handle_idr);
 328
 329         __module_get(THIS_MODULE);
 330         call_rcu(&head->rcu, fl_destroy_rcu);
 331 }
 332
 333 static void *fl_get(struct tcf_proto *tp, u32 handle)
 334 {
 335         struct cls_fl_head *head = rtnl_dereference(tp->root);
 336
 337         return idr_find(&head->handle_idr, handle);
 338 }
 339
 340 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 341         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 342         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 343         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 344                                             .len = IFNAMSIZ },
 345         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 346         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 347         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 348         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 349         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 350         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 351         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 352         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 353         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 354         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 355         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 356         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 357         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 358         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 359         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 360         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 361         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 362         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 363         [TCA_FLOWER_KEY_VLAN_ID]        = { .type = NLA_U16 },
 364         [TCA_FLOWER_KEY_VLAN_PRIO]      = { .type = NLA_U8 },
 365         [TCA_FLOWER_KEY_VLAN_ETH_TYPE]  = { .type = NLA_U16 },
 366         [TCA_FLOWER_KEY_ENC_KEY_ID]     = { .type = NLA_U32 },
 367         [TCA_FLOWER_KEY_ENC_IPV4_SRC]   = { .type = NLA_U32 },
 368         [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
 369         [TCA_FLOWER_KEY_ENC_IPV4_DST]   = { .type = NLA_U32 },
 370         [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
 371         [TCA_FLOWER_KEY_ENC_IPV6_SRC]   = { .len = sizeof(struct in6_addr) },
 372         [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
 373         [TCA_FLOWER_KEY_ENC_IPV6_DST]   = { .len = sizeof(struct in6_addr) },
 374         [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
 375         [TCA_FLOWER_KEY_TCP_SRC_MASK]   = { .type = NLA_U16 },
 376         [TCA_FLOWER_KEY_TCP_DST_MASK]   = { .type = NLA_U16 },
 377         [TCA_FLOWER_KEY_UDP_SRC_MASK]   = { .type = NLA_U16 },
 378         [TCA_FLOWER_KEY_UDP_DST_MASK]   = { .type = NLA_U16 },
 379         [TCA_FLOWER_KEY_SCTP_SRC_MASK]  = { .type = NLA_U16 },
 380         [TCA_FLOWER_KEY_SCTP_DST_MASK]  = { .type = NLA_U16 },
 381         [TCA_FLOWER_KEY_SCTP_SRC]       = { .type = NLA_U16 },
 382         [TCA_FLOWER_KEY_SCTP_DST]       = { .type = NLA_U16 },
 383         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT]       = { .type = NLA_U16 },
 384         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK]  = { .type = NLA_U16 },
 385         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT]       = { .type = NLA_U16 },
 386         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK]  = { .type = NLA_U16 },
 387         [TCA_FLOWER_KEY_FLAGS]          = { .type = NLA_U32 },
 388         [TCA_FLOWER_KEY_FLAGS_MASK]     = { .type = NLA_U32 },
 389         [TCA_FLOWER_KEY_ICMPV4_TYPE]    = { .type = NLA_U8 },
 390         [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 },
 391         [TCA_FLOWER_KEY_ICMPV4_CODE]    = { .type = NLA_U8 },
 392         [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 },
 393         [TCA_FLOWER_KEY_ICMPV6_TYPE]    = { .type = NLA_U8 },
 394         [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 },
 395         [TCA_FLOWER_KEY_ICMPV6_CODE]    = { .type = NLA_U8 },
 396         [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 },
 397         [TCA_FLOWER_KEY_ARP_SIP]        = { .type = NLA_U32 },
 398         [TCA_FLOWER_KEY_ARP_SIP_MASK]   = { .type = NLA_U32 },
 399         [TCA_FLOWER_KEY_ARP_TIP]        = { .type = NLA_U32 },
 400         [TCA_FLOWER_KEY_ARP_TIP_MASK]   = { .type = NLA_U32 },
 401         [TCA_FLOWER_KEY_ARP_OP]         = { .type = NLA_U8 },
 402         [TCA_FLOWER_KEY_ARP_OP_MASK]    = { .type = NLA_U8 },
 403         [TCA_FLOWER_KEY_ARP_SHA]        = { .len = ETH_ALEN },
 404         [TCA_FLOWER_KEY_ARP_SHA_MASK]   = { .len = ETH_ALEN },
 405         [TCA_FLOWER_KEY_ARP_THA]        = { .len = ETH_ALEN },
 406         [TCA_FLOWER_KEY_ARP_THA_MASK]   = { .len = ETH_ALEN },
 407         [TCA_FLOWER_KEY_MPLS_TTL]       = { .type = NLA_U8 },
 408         [TCA_FLOWER_KEY_MPLS_BOS]       = { .type = NLA_U8 },
 409         [TCA_FLOWER_KEY_MPLS_TC]        = { .type = NLA_U8 },
 410         [TCA_FLOWER_KEY_MPLS_LABEL]     = { .type = NLA_U32 },
 411         [TCA_FLOWER_KEY_TCP_FLAGS]      = { .type = NLA_U16 },
 412         [TCA_FLOWER_KEY_TCP_FLAGS_MASK] = { .type = NLA_U16 },
 413         [TCA_FLOWER_KEY_IP_TOS]         = { .type = NLA_U8 },
 414         [TCA_FLOWER_KEY_IP_TOS_MASK]    = { .type = NLA_U8 },
 415         [TCA_FLOWER_KEY_IP_TTL]         = { .type = NLA_U8 },
 416         [TCA_FLOWER_KEY_IP_TTL_MASK]    = { .type = NLA_U8 },
 417 };
 418
 419 static void fl_set_key_val(struct nlattr **tb,
 420                            void *val, int val_type,
 421                            void *mask, int mask_type, int len)
 422 {
 423         if (!tb[val_type])
 424                 return;
 425         memcpy(val, nla_data(tb[val_type]), len);
 426         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 427                 memset(mask, 0xff, len);
 428         else
 429                 memcpy(mask, nla_data(tb[mask_type]), len);
 430 }
 431
 432 static int fl_set_key_mpls(struct nlattr **tb,
 433                            struct flow_dissector_key_mpls *key_val,
 434                            struct flow_dissector_key_mpls *key_mask)
 435 {
 436         if (tb[TCA_FLOWER_KEY_MPLS_TTL]) {
 437                 key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]);
 438                 key_mask->mpls_ttl = MPLS_TTL_MASK;
 439         }
 440         if (tb[TCA_FLOWER_KEY_MPLS_BOS]) {
 441                 u8 bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]);
 442
 443                 if (bos & ~MPLS_BOS_MASK)
 444                         return -EINVAL;
 445                 key_val->mpls_bos = bos;
 446                 key_mask->mpls_bos = MPLS_BOS_MASK;
 447         }
 448         if (tb[TCA_FLOWER_KEY_MPLS_TC]) {
 449                 u8 tc = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]);
 450
 451                 if (tc & ~MPLS_TC_MASK)
 452                         return -EINVAL;
 453                 key_val->mpls_tc = tc;
 454                 key_mask->mpls_tc = MPLS_TC_MASK;
 455         }
 456         if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) {
 457                 u32 label = nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]);
 458
 459                 if (label & ~MPLS_LABEL_MASK)
 460                         return -EINVAL;
 461                 key_val->mpls_label = label;
 462                 key_mask->mpls_label = MPLS_LABEL_MASK;
 463         }
 464         return 0;
 465 }
 466
 467 static void fl_set_key_vlan(struct nlattr **tb,
 468                             struct flow_dissector_key_vlan *key_val,
 469                             struct flow_dissector_key_vlan *key_mask)
 470 {
 471 #define VLAN_PRIORITY_MASK      0x7
 472
 473         if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
 474                 key_val->vlan_id =
 475                         nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
 476                 key_mask->vlan_id = VLAN_VID_MASK;
 477         }
 478         if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
 479                 key_val->vlan_priority =
 480                         nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
 481                         VLAN_PRIORITY_MASK;
 482                 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
 483         }
 484 }
 485
 486 static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
 487                             u32 *dissector_key, u32 *dissector_mask,
 488                             u32 flower_flag_bit, u32 dissector_flag_bit)
 489 {
 490         if (flower_mask & flower_flag_bit) {
 491                 *dissector_mask |= dissector_flag_bit;
 492                 if (flower_key & flower_flag_bit)
 493                         *dissector_key |= dissector_flag_bit;
 494         }
 495 }
 496
 497 static int fl_set_key_flags(struct nlattr **tb,
 498                             u32 *flags_key, u32 *flags_mask)
 499 {
 500         u32 key, mask;
 501
 502         /* mask is mandatory for flags */
 503         if (!tb[TCA_FLOWER_KEY_FLAGS_MASK])
 504                 return -EINVAL;
 505
 506         key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS]));
 507         mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
 508
 509         *flags_key  = 0;
 510         *flags_mask = 0;
 511
 512         fl_set_key_flag(key, mask, flags_key, flags_mask,
 513                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
 514
 515         return 0;
 516 }
 517
 518 static void fl_set_key_ip(struct nlattr **tb,
 519                           struct flow_dissector_key_ip *key,
 520                           struct flow_dissector_key_ip *mask)
 521 {
 522                 fl_set_key_val(tb, &key->tos, TCA_FLOWER_KEY_IP_TOS,
 523                                &mask->tos, TCA_FLOWER_KEY_IP_TOS_MASK,
 524                                sizeof(key->tos));
 525
 526                 fl_set_key_val(tb, &key->ttl, TCA_FLOWER_KEY_IP_TTL,
 527                                &mask->ttl, TCA_FLOWER_KEY_IP_TTL_MASK,
 528                                sizeof(key->ttl));
 529 }
 530
 531 static int fl_set_key(struct net *net, struct nlattr **tb,
 532                       struct fl_flow_key *key, struct fl_flow_key *mask,
 533                       struct netlink_ext_ack *extack)
 534 {
 535         __be16 ethertype;
 536         int ret = 0;
 537 #ifdef CONFIG_NET_CLS_IND
 538         if (tb[TCA_FLOWER_INDEV]) {
 539                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV], extack);
 540                 if (err < 0)
 541                         return err;
 542                 key->indev_ifindex = err;
 543                 mask->indev_ifindex = 0xffffffff;
 544         }
 545 #endif
 546
 547         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 548                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 549                        sizeof(key->eth.dst));
 550         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 551                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 552                        sizeof(key->eth.src));
 553
 554         if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
 555                 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
 556
 557                 if (ethertype == htons(ETH_P_8021Q)) {
 558                         fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
 559                         fl_set_key_val(tb, &key->basic.n_proto,
 560                                        TCA_FLOWER_KEY_VLAN_ETH_TYPE,
 561                                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 562                                        sizeof(key->basic.n_proto));
 563                 } else {
 564                         key->basic.n_proto = ethertype;
 565                         mask->basic.n_proto = cpu_to_be16(~0);
 566                 }
 567         }
 568
 569         if (key->basic.n_proto == htons(ETH_P_IP) ||
 570             key->basic.n_proto == htons(ETH_P_IPV6)) {
 571                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 572                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 573                                sizeof(key->basic.ip_proto));
 574                 fl_set_key_ip(tb, &key->ip, &mask->ip);
 575         }
 576
 577         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 578                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 579                 mask->control.addr_type = ~0;
 580                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 581                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 582                                sizeof(key->ipv4.src));
 583                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 584                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 585                                sizeof(key->ipv4.dst));
 586         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 587                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 588                 mask->control.addr_type = ~0;
 589                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 590                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 591                                sizeof(key->ipv6.src));
 592                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 593                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 594                                sizeof(key->ipv6.dst));
 595         }
 596
 597         if (key->basic.ip_proto == IPPROTO_TCP) {
 598                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 599                                &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
 600                                sizeof(key->tp.src));
 601                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 602                                &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 603                                sizeof(key->tp.dst));
 604                 fl_set_key_val(tb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
 605                                &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
 606                                sizeof(key->tcp.flags));
 607         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 608                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 609                                &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
 610                                sizeof(key->tp.src));
 611                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 612                                &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
 613                                sizeof(key->tp.dst));
 614         } else if (key->basic.ip_proto == IPPROTO_SCTP) {
 615                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
 616                                &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
 617                                sizeof(key->tp.src));
 618                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
 619                                &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
 620                                sizeof(key->tp.dst));
 621         } else if (key->basic.n_proto == htons(ETH_P_IP) &&
 622                    key->basic.ip_proto == IPPROTO_ICMP) {
 623                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV4_TYPE,
 624                                &mask->icmp.type,
 625                                TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
 626                                sizeof(key->icmp.type));
 627                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE,
 628                                &mask->icmp.code,
 629                                TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
 630                                sizeof(key->icmp.code));
 631         } else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
 632                    key->basic.ip_proto == IPPROTO_ICMPV6) {
 633                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV6_TYPE,
 634                                &mask->icmp.type,
 635                                TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
 636                                sizeof(key->icmp.type));
 637                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV6_CODE,
 638                                &mask->icmp.code,
 639                                TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
 640                                sizeof(key->icmp.code));
 641         } else if (key->basic.n_proto == htons(ETH_P_MPLS_UC) ||
 642                    key->basic.n_proto == htons(ETH_P_MPLS_MC)) {
 643                 ret = fl_set_key_mpls(tb, &key->mpls, &mask->mpls);
 644                 if (ret)
 645                         return ret;
 646         } else if (key->basic.n_proto == htons(ETH_P_ARP) ||
 647                    key->basic.n_proto == htons(ETH_P_RARP)) {
 648                 fl_set_key_val(tb, &key->arp.sip, TCA_FLOWER_KEY_ARP_SIP,
 649                                &mask->arp.sip, TCA_FLOWER_KEY_ARP_SIP_MASK,
 650                                sizeof(key->arp.sip));
 651                 fl_set_key_val(tb, &key->arp.tip, TCA_FLOWER_KEY_ARP_TIP,
 652                                &mask->arp.tip, TCA_FLOWER_KEY_ARP_TIP_MASK,
 653                                sizeof(key->arp.tip));
 654                 fl_set_key_val(tb, &key->arp.op, TCA_FLOWER_KEY_ARP_OP,
 655                                &mask->arp.op, TCA_FLOWER_KEY_ARP_OP_MASK,
 656                                sizeof(key->arp.op));
 657                 fl_set_key_val(tb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
 658                                mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
 659                                sizeof(key->arp.sha));
 660                 fl_set_key_val(tb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
 661                                mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
 662                                sizeof(key->arp.tha));
 663         }
 664
 665         if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
 666             tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
 667                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 668                 mask->enc_control.addr_type = ~0;
 669                 fl_set_key_val(tb, &key->enc_ipv4.src,
 670                                TCA_FLOWER_KEY_ENC_IPV4_SRC,
 671                                &mask->enc_ipv4.src,
 672                                TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
 673                                sizeof(key->enc_ipv4.src));
 674                 fl_set_key_val(tb, &key->enc_ipv4.dst,
 675                                TCA_FLOWER_KEY_ENC_IPV4_DST,
 676                                &mask->enc_ipv4.dst,
 677                                TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
 678                                sizeof(key->enc_ipv4.dst));
 679         }
 680
 681         if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] ||
 682             tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) {
 683                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 684                 mask->enc_control.addr_type = ~0;
 685                 fl_set_key_val(tb, &key->enc_ipv6.src,
 686                                TCA_FLOWER_KEY_ENC_IPV6_SRC,
 687                                &mask->enc_ipv6.src,
 688                                TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
 689                                sizeof(key->enc_ipv6.src));
 690                 fl_set_key_val(tb, &key->enc_ipv6.dst,
 691                                TCA_FLOWER_KEY_ENC_IPV6_DST,
 692                                &mask->enc_ipv6.dst,
 693                                TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
 694                                sizeof(key->enc_ipv6.dst));
 695         }
 696
 697         fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID,
 698                        &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC,
 699                        sizeof(key->enc_key_id.keyid));
 700
 701         fl_set_key_val(tb, &key->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
 702                        &mask->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
 703                        sizeof(key->enc_tp.src));
 704
 705         fl_set_key_val(tb, &key->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
 706                        &mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
 707                        sizeof(key->enc_tp.dst));
 708
 709         if (tb[TCA_FLOWER_KEY_FLAGS])
 710                 ret = fl_set_key_flags(tb, &key->control.flags, &mask->control.flags);
 711
 712         return ret;
 713 }
 714
 715 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 716                        struct fl_flow_mask *mask2)
 717 {
 718         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 719         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 720
 721         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 722                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 723 }
 724
 725 static const struct rhashtable_params fl_ht_params = {
 726         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 727         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 728         .automatic_shrinking = true,
 729 };
 730
 731 static int fl_init_hashtable(struct cls_fl_head *head,
 732                              struct fl_flow_mask *mask)
 733 {
 734         head->ht_params = fl_ht_params;
 735         head->ht_params.key_len = fl_mask_range(mask);
 736         head->ht_params.key_offset += mask->range.start;
 737
 738         return rhashtable_init(&head->ht, &head->ht_params);
 739 }
 740
 741 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 742 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 743
 744 #define FL_KEY_IS_MASKED(mask, member)                                          \
 745         memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),               \
 746                    0, FL_KEY_MEMBER_SIZE(member))                               \
 747
 748 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 749         do {                                                                    \
 750                 keys[cnt].key_id = id;                                          \
 751                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 752                 cnt++;                                                          \
 753         } while(0);
 754
 755 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)                       \
 756         do {                                                                    \
 757                 if (FL_KEY_IS_MASKED(mask, member))                             \
 758                         FL_KEY_SET(keys, cnt, id, member);                      \
 759         } while(0);
 760
 761 static void fl_init_dissector(struct cls_fl_head *head,
 762                               struct fl_flow_mask *mask)
 763 {
 764         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 765         size_t cnt = 0;
 766
 767         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 768         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 769         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 770                              FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 771         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 772                              FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 773         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 774                              FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 775         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 776                              FLOW_DISSECTOR_KEY_PORTS, tp);
 777         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 778                              FLOW_DISSECTOR_KEY_IP, ip);
 779         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 780                              FLOW_DISSECTOR_KEY_TCP, tcp);
 781         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 782                              FLOW_DISSECTOR_KEY_ICMP, icmp);
 783         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 784                              FLOW_DISSECTOR_KEY_ARP, arp);
 785         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 786                              FLOW_DISSECTOR_KEY_MPLS, mpls);
 787         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 788                              FLOW_DISSECTOR_KEY_VLAN, vlan);
 789         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 790                              FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
 791         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 792                              FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
 793         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 794                              FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
 795         if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) ||
 796             FL_KEY_IS_MASKED(&mask->key, enc_ipv6))
 797                 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL,
 798                            enc_control);
 799         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 800                              FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
 801
 802         skb_flow_dissector_init(&head->dissector, keys, cnt);
 803 }
 804
 805 static int fl_check_assign_mask(struct cls_fl_head *head,
 806                                 struct fl_flow_mask *mask)
 807 {
 808         int err;
 809
 810         if (head->mask_assigned) {
 811                 if (!fl_mask_eq(&head->mask, mask))
 812                         return -EINVAL;
 813                 else
 814                         return 0;
 815         }
 816
 817         /* Mask is not assigned yet. So assign it and init hashtable
 818          * according to that.
 819          */
 820         err = fl_init_hashtable(head, mask);
 821         if (err)
 822                 return err;
 823         memcpy(&head->mask, mask, sizeof(head->mask));
 824         head->mask_assigned = true;
 825
 826         fl_init_dissector(head, mask);
 827
 828         return 0;
 829 }
 830
 831 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 832                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 833                         unsigned long base, struct nlattr **tb,
 834                         struct nlattr *est, bool ovr,
 835                         struct netlink_ext_ack *extack)
 836 {
 837         int err;
 838
 839         err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
 840         if (err < 0)
 841                 return err;
 842
 843         if (tb[TCA_FLOWER_CLASSID]) {
 844                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 845                 tcf_bind_filter(tp, &f->res, base);
 846         }
 847
 848         err = fl_set_key(net, tb, &f->key, &mask->key, extack);
 849         if (err)
 850                 return err;
 851
 852         fl_mask_update_range(mask);
 853         fl_set_masked_key(&f->mkey, &f->key, mask);
 854
 855         return 0;
 856 }
 857
 858 static int fl_change(struct net *net, struct sk_buff *in_skb,
 859                      struct tcf_proto *tp, unsigned long base,
 860                      u32 handle, struct nlattr **tca,
 861                      void **arg, bool ovr, struct netlink_ext_ack *extack)
 862 {
 863         struct cls_fl_head *head = rtnl_dereference(tp->root);
 864         struct cls_fl_filter *fold = *arg;
 865         struct cls_fl_filter *fnew;
 866         struct nlattr **tb;
 867         struct fl_flow_mask mask = {};
 868         int err;
 869
 870         if (!tca[TCA_OPTIONS])
 871                 return -EINVAL;
 872
 873         tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
 874         if (!tb)
 875                 return -ENOBUFS;
 876
 877         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
 878                                fl_policy, NULL);
 879         if (err < 0)
 880                 goto errout_tb;
 881
 882         if (fold && handle && fold->handle != handle) {
 883                 err = -EINVAL;
 884                 goto errout_tb;
 885         }
 886
 887         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 888         if (!fnew) {
 889                 err = -ENOBUFS;
 890                 goto errout_tb;
 891         }
 892
 893         err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 894         if (err < 0)
 895                 goto errout;
 896
 897         if (!handle) {
 898                 handle = 1;
 899                 err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
 900                                     INT_MAX, GFP_KERNEL);
 901         } else if (!fold) {
 902                 /* user specifies a handle and it doesn't exist */
 903                 err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
 904                                     handle, GFP_KERNEL);
 905         }
 906         if (err)
 907                 goto errout;
 908         fnew->handle = handle;
 909
 910         if (tb[TCA_FLOWER_FLAGS]) {
 911                 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 912
 913                 if (!tc_flags_valid(fnew->flags)) {
 914                         err = -EINVAL;
 915                         goto errout_idr;
 916                 }
 917         }
 918
 919         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr,
 920                            extack);
 921         if (err)
 922                 goto errout_idr;
 923
 924         err = fl_check_assign_mask(head, &mask);
 925         if (err)
 926                 goto errout_idr;
 927
 928         if (!tc_skip_sw(fnew->flags)) {
 929                 if (!fold && fl_lookup(head, &fnew->mkey)) {
 930                         err = -EEXIST;
 931                         goto errout_idr;
 932                 }
 933
 934                 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 935                                              head->ht_params);
 936                 if (err)
 937                         goto errout_idr;
 938         }
 939
 940         if (!tc_skip_hw(fnew->flags)) {
 941                 err = fl_hw_replace_filter(tp,
 942                                            &head->dissector,
 943                                            &mask.key,
 944                                            fnew,
 945                                            extack);
 946                 if (err)
 947                         goto errout_idr;
 948         }
 949
 950         if (!tc_in_hw(fnew->flags))
 951                 fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 952
 953         if (fold) {
 954                 if (!tc_skip_sw(fold->flags))
 955                         rhashtable_remove_fast(&head->ht, &fold->ht_node,
 956                                                head->ht_params);
 957                 if (!tc_skip_hw(fold->flags))
 958                         fl_hw_destroy_filter(tp, fold, NULL);
 959         }
 960
 961         *arg = fnew;
 962
 963         if (fold) {
 964                 idr_replace(&head->handle_idr, fnew, fnew->handle);
 965                 list_replace_rcu(&fold->list, &fnew->list);
 966                 tcf_unbind_filter(tp, &fold->res);
 967                 tcf_exts_get_net(&fold->exts);
 968                 call_rcu(&fold->rcu, fl_destroy_filter);
 969         } else {
 970                 list_add_tail_rcu(&fnew->list, &head->filters);
 971         }
 972
 973         kfree(tb);
 974         return 0;
 975
 976 errout_idr:
 977         if (fnew->handle)
 978                 idr_remove(&head->handle_idr, fnew->handle);
 979 errout:
 980         tcf_exts_destroy(&fnew->exts);
 981         kfree(fnew);
 982 errout_tb:
 983         kfree(tb);
 984         return err;
 985 }
 986
 987 static int fl_delete(struct tcf_proto *tp, void *arg, bool *last,
 988                      struct netlink_ext_ack *extack)
 989 {
 990         struct cls_fl_head *head = rtnl_dereference(tp->root);
 991         struct cls_fl_filter *f = arg;
 992
 993         if (!tc_skip_sw(f->flags))
 994                 rhashtable_remove_fast(&head->ht, &f->ht_node,
 995                                        head->ht_params);
 996         __fl_delete(tp, f, extack);
 997         *last = list_empty(&head->filters);
 998         return 0;
 999 }
1000
1001 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1002 {
1003         struct cls_fl_head *head = rtnl_dereference(tp->root);
1004         struct cls_fl_filter *f;
1005
1006         list_for_each_entry_rcu(f, &head->filters, list) {
1007                 if (arg->count < arg->skip)
1008                         goto skip;
1009                 if (arg->fn(tp, f, arg) < 0) {
1010                         arg->stop = 1;
1011                         break;
1012                 }
1013 skip:
1014                 arg->count++;
1015         }
1016 }
1017
1018 static int fl_dump_key_val(struct sk_buff *skb,
1019                            void *val, int val_type,
1020                            void *mask, int mask_type, int len)
1021 {
1022         int err;
1023
1024         if (!memchr_inv(mask, 0, len))
1025                 return 0;
1026         err = nla_put(skb, val_type, len, val);
1027         if (err)
1028                 return err;
1029         if (mask_type != TCA_FLOWER_UNSPEC) {
1030                 err = nla_put(skb, mask_type, len, mask);
1031                 if (err)
1032                         return err;
1033         }
1034         return 0;
1035 }
1036
1037 static int fl_dump_key_mpls(struct sk_buff *skb,
1038                             struct flow_dissector_key_mpls *mpls_key,
1039                             struct flow_dissector_key_mpls *mpls_mask)
1040 {
1041         int err;
1042
1043         if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask)))
1044                 return 0;
1045         if (mpls_mask->mpls_ttl) {
1046                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL,
1047                                  mpls_key->mpls_ttl);
1048                 if (err)
1049                         return err;
1050         }
1051         if (mpls_mask->mpls_tc) {
1052                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC,
1053                                  mpls_key->mpls_tc);
1054                 if (err)
1055                         return err;
1056         }
1057         if (mpls_mask->mpls_label) {
1058                 err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL,
1059                                   mpls_key->mpls_label);
1060                 if (err)
1061                         return err;
1062         }
1063         if (mpls_mask->mpls_bos) {
1064                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS,
1065                                  mpls_key->mpls_bos);
1066                 if (err)
1067                         return err;
1068         }
1069         return 0;
1070 }
1071
1072 static int fl_dump_key_ip(struct sk_buff *skb,
1073                           struct flow_dissector_key_ip *key,
1074                           struct flow_dissector_key_ip *mask)
1075 {
1076         if (fl_dump_key_val(skb, &key->tos, TCA_FLOWER_KEY_IP_TOS, &mask->tos,
1077                             TCA_FLOWER_KEY_IP_TOS_MASK, sizeof(key->tos)) ||
1078             fl_dump_key_val(skb, &key->ttl, TCA_FLOWER_KEY_IP_TTL, &mask->ttl,
1079                             TCA_FLOWER_KEY_IP_TTL_MASK, sizeof(key->ttl)))
1080                 return -1;
1081
1082         return 0;
1083 }
1084
1085 static int fl_dump_key_vlan(struct sk_buff *skb,
1086                             struct flow_dissector_key_vlan *vlan_key,
1087                             struct flow_dissector_key_vlan *vlan_mask)
1088 {
1089         int err;
1090
1091         if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
1092                 return 0;
1093         if (vlan_mask->vlan_id) {
1094                 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
1095                                   vlan_key->vlan_id);
1096                 if (err)
1097                         return err;
1098         }
1099         if (vlan_mask->vlan_priority) {
1100                 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
1101                                  vlan_key->vlan_priority);
1102                 if (err)
1103                         return err;
1104         }
1105         return 0;
1106 }
1107
1108 static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
1109                             u32 *flower_key, u32 *flower_mask,
1110                             u32 flower_flag_bit, u32 dissector_flag_bit)
1111 {
1112         if (dissector_mask & dissector_flag_bit) {
1113                 *flower_mask |= flower_flag_bit;
1114                 if (dissector_key & dissector_flag_bit)
1115                         *flower_key |= flower_flag_bit;
1116         }
1117 }
1118
1119 static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
1120 {
1121         u32 key, mask;
1122         __be32 _key, _mask;
1123         int err;
1124
1125         if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
1126                 return 0;
1127
1128         key = 0;
1129         mask = 0;
1130
1131         fl_get_key_flag(flags_key, flags_mask, &key, &mask,
1132                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
1133
1134         _key = cpu_to_be32(key);
1135         _mask = cpu_to_be32(mask);
1136
1137         err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
1138         if (err)
1139                 return err;
1140
1141         return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
1142 }
1143
1144 static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
1145                    struct sk_buff *skb, struct tcmsg *t)
1146 {
1147         struct cls_fl_head *head = rtnl_dereference(tp->root);
1148         struct cls_fl_filter *f = fh;
1149         struct nlattr *nest;
1150         struct fl_flow_key *key, *mask;
1151
1152         if (!f)
1153                 return skb->len;
1154
1155         t->tcm_handle = f->handle;
1156
1157         nest = nla_nest_start(skb, TCA_OPTIONS);
1158         if (!nest)
1159                 goto nla_put_failure;
1160
1161         if (f->res.classid &&
1162             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
1163                 goto nla_put_failure;
1164
1165         key = &f->key;
1166         mask = &head->mask.key;
1167
1168         if (mask->indev_ifindex) {
1169                 struct net_device *dev;
1170
1171                 dev = __dev_get_by_index(net, key->indev_ifindex);
1172                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
1173                         goto nla_put_failure;
1174         }
1175
1176         if (!tc_skip_hw(f->flags))
1177                 fl_hw_update_stats(tp, f);
1178
1179         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
1180                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
1181                             sizeof(key->eth.dst)) ||
1182             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
1183                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
1184                             sizeof(key->eth.src)) ||
1185             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
1186                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
1187                             sizeof(key->basic.n_proto)))
1188                 goto nla_put_failure;
1189
1190         if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls))
1191                 goto nla_put_failure;
1192
1193         if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
1194                 goto nla_put_failure;
1195
1196         if ((key->basic.n_proto == htons(ETH_P_IP) ||
1197              key->basic.n_proto == htons(ETH_P_IPV6)) &&
1198             (fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
1199                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
1200                             sizeof(key->basic.ip_proto)) ||
1201             fl_dump_key_ip(skb, &key->ip, &mask->ip)))
1202                 goto nla_put_failure;
1203
1204         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1205             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
1206                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
1207                              sizeof(key->ipv4.src)) ||
1208              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
1209                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
1210                              sizeof(key->ipv4.dst))))
1211                 goto nla_put_failure;
1212         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1213                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
1214                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
1215                                   sizeof(key->ipv6.src)) ||
1216                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
1217                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
1218                                   sizeof(key->ipv6.dst))))
1219                 goto nla_put_failure;
1220
1221         if (key->basic.ip_proto == IPPROTO_TCP &&
1222             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
1223                              &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
1224                              sizeof(key->tp.src)) ||
1225              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
1226                              &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
1227                              sizeof(key->tp.dst)) ||
1228              fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
1229                              &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
1230                              sizeof(key->tcp.flags))))
1231                 goto nla_put_failure;
1232         else if (key->basic.ip_proto == IPPROTO_UDP &&
1233                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
1234                                   &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
1235                                   sizeof(key->tp.src)) ||
1236                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
1237                                   &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
1238                                   sizeof(key->tp.dst))))
1239                 goto nla_put_failure;
1240         else if (key->basic.ip_proto == IPPROTO_SCTP &&
1241                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
1242                                   &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
1243                                   sizeof(key->tp.src)) ||
1244                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
1245                                   &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
1246                                   sizeof(key->tp.dst))))
1247                 goto nla_put_failure;
1248         else if (key->basic.n_proto == htons(ETH_P_IP) &&
1249                  key->basic.ip_proto == IPPROTO_ICMP &&
1250                  (fl_dump_key_val(skb, &key->icmp.type,
1251                                   TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type,
1252                                   TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
1253                                   sizeof(key->icmp.type)) ||
1254                   fl_dump_key_val(skb, &key->icmp.code,
1255                                   TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code,
1256                                   TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
1257                                   sizeof(key->icmp.code))))
1258                 goto nla_put_failure;
1259         else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
1260                  key->basic.ip_proto == IPPROTO_ICMPV6 &&
1261                  (fl_dump_key_val(skb, &key->icmp.type,
1262                                   TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type,
1263                                   TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
1264                                   sizeof(key->icmp.type)) ||
1265                   fl_dump_key_val(skb, &key->icmp.code,
1266                                   TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code,
1267                                   TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
1268                                   sizeof(key->icmp.code))))
1269                 goto nla_put_failure;
1270         else if ((key->basic.n_proto == htons(ETH_P_ARP) ||
1271                   key->basic.n_proto == htons(ETH_P_RARP)) &&
1272                  (fl_dump_key_val(skb, &key->arp.sip,
1273                                   TCA_FLOWER_KEY_ARP_SIP, &mask->arp.sip,
1274                                   TCA_FLOWER_KEY_ARP_SIP_MASK,
1275                                   sizeof(key->arp.sip)) ||
1276                   fl_dump_key_val(skb, &key->arp.tip,
1277                                   TCA_FLOWER_KEY_ARP_TIP, &mask->arp.tip,
1278                                   TCA_FLOWER_KEY_ARP_TIP_MASK,
1279                                   sizeof(key->arp.tip)) ||
1280                   fl_dump_key_val(skb, &key->arp.op,
1281                                   TCA_FLOWER_KEY_ARP_OP, &mask->arp.op,
1282                                   TCA_FLOWER_KEY_ARP_OP_MASK,
1283                                   sizeof(key->arp.op)) ||
1284                   fl_dump_key_val(skb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
1285                                   mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
1286                                   sizeof(key->arp.sha)) ||
1287                   fl_dump_key_val(skb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
1288                                   mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
1289                                   sizeof(key->arp.tha))))
1290                 goto nla_put_failure;
1291
1292         if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1293             (fl_dump_key_val(skb, &key->enc_ipv4.src,
1294                             TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
1295                             TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
1296                             sizeof(key->enc_ipv4.src)) ||
1297              fl_dump_key_val(skb, &key->enc_ipv4.dst,
1298                              TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
1299                              TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
1300                              sizeof(key->enc_ipv4.dst))))
1301                 goto nla_put_failure;
1302         else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1303                  (fl_dump_key_val(skb, &key->enc_ipv6.src,
1304                             TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
1305                             TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
1306                             sizeof(key->enc_ipv6.src)) ||
1307                  fl_dump_key_val(skb, &key->enc_ipv6.dst,
1308                                  TCA_FLOWER_KEY_ENC_IPV6_DST,
1309                                  &mask->enc_ipv6.dst,
1310                                  TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
1311                             sizeof(key->enc_ipv6.dst))))
1312                 goto nla_put_failure;
1313
1314         if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
1315                             &mask->enc_key_id, TCA_FLOWER_UNSPEC,
1316                             sizeof(key->enc_key_id)) ||
1317             fl_dump_key_val(skb, &key->enc_tp.src,
1318                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
1319                             &mask->enc_tp.src,
1320                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
1321                             sizeof(key->enc_tp.src)) ||
1322             fl_dump_key_val(skb, &key->enc_tp.dst,
1323                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
1324                             &mask->enc_tp.dst,
1325                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
1326                             sizeof(key->enc_tp.dst)))
1327                 goto nla_put_failure;
1328
1329         if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
1330                 goto nla_put_failure;
1331
1332         if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
1333                 goto nla_put_failure;
1334
1335         if (tcf_exts_dump(skb, &f->exts))
1336                 goto nla_put_failure;
1337
1338         nla_nest_end(skb, nest);
1339
1340         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
1341                 goto nla_put_failure;
1342
1343         return skb->len;
1344
1345 nla_put_failure:
1346         nla_nest_cancel(skb, nest);
1347         return -1;
1348 }
1349
1350 static void fl_bind_class(void *fh, u32 classid, unsigned long cl)
1351 {
1352         struct cls_fl_filter *f = fh;
1353
1354         if (f && f->res.classid == classid)
1355                 f->res.class = cl;
1356 }
1357
1358 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
1359         .kind           = "flower",
1360         .classify       = fl_classify,
1361         .init           = fl_init,
1362         .destroy        = fl_destroy,
1363         .get            = fl_get,
1364         .change         = fl_change,
1365         .delete         = fl_delete,
1366         .walk           = fl_walk,
1367         .dump           = fl_dump,
1368         .bind_class     = fl_bind_class,
1369         .owner          = THIS_MODULE,
1370 };
1371
1372 static int __init cls_fl_init(void)
1373 {
1374         return register_tcf_proto_ops(&cls_fl_ops);
1375 }
1376
1377 static void __exit cls_fl_exit(void)
1378 {
1379         unregister_tcf_proto_ops(&cls_fl_ops);
1380 }
1381
1382 module_init(cls_fl_init);
1383 module_exit(cls_fl_exit);
1384
1385 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
1386 MODULE_DESCRIPTION("Flower classifier");
1387 MODULE_LICENSE("GPL v2");