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 {
 223         struct tc_cls_flower_offload cls_flower = {};
 224         struct tcf_block *block = tp->chain->block;
 225
 226         tc_cls_common_offload_init(&cls_flower.common, tp, NULL);
 227         cls_flower.command = TC_CLSFLOWER_DESTROY;
 228         cls_flower.cookie = (unsigned long) f;
 229
 230         tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 231                          &cls_flower, false);
 232         tcf_block_offload_dec(block, &f->flags);
 233 }
 234
 235 static int fl_hw_replace_filter(struct tcf_proto *tp,
 236                                 struct flow_dissector *dissector,
 237                                 struct fl_flow_key *mask,
 238                                 struct cls_fl_filter *f,
 239                                 struct netlink_ext_ack *extack)
 240 {
 241         struct tc_cls_flower_offload cls_flower = {};
 242         struct tcf_block *block = tp->chain->block;
 243         bool skip_sw = tc_skip_sw(f->flags);
 244         int err;
 245
 246         tc_cls_common_offload_init(&cls_flower.common, tp, extack);
 247         cls_flower.command = TC_CLSFLOWER_REPLACE;
 248         cls_flower.cookie = (unsigned long) f;
 249         cls_flower.dissector = dissector;
 250         cls_flower.mask = mask;
 251         cls_flower.key = &f->mkey;
 252         cls_flower.exts = &f->exts;
 253         cls_flower.classid = f->res.classid;
 254
 255         err = tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 256                                &cls_flower, skip_sw);
 257         if (err < 0) {
 258                 fl_hw_destroy_filter(tp, f);
 259                 return err;
 260         } else if (err > 0) {
 261                 tcf_block_offload_inc(block, &f->flags);
 262         }
 263
 264         if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW))
 265                 return -EINVAL;
 266
 267         return 0;
 268 }
 269
 270 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 271 {
 272         struct tc_cls_flower_offload cls_flower = {};
 273         struct tcf_block *block = tp->chain->block;
 274
 275         tc_cls_common_offload_init(&cls_flower.common, tp, NULL);
 276         cls_flower.command = TC_CLSFLOWER_STATS;
 277         cls_flower.cookie = (unsigned long) f;
 278         cls_flower.exts = &f->exts;
 279         cls_flower.classid = f->res.classid;
 280
 281         tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 282                          &cls_flower, false);
 283 }
 284
 285 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
 286 {
 287         struct cls_fl_head *head = rtnl_dereference(tp->root);
 288
 289         idr_remove_ext(&head->handle_idr, f->handle);
 290         list_del_rcu(&f->list);
 291         if (!tc_skip_hw(f->flags))
 292                 fl_hw_destroy_filter(tp, f);
 293         tcf_unbind_filter(tp, &f->res);
 294         if (tcf_exts_get_net(&f->exts))
 295                 call_rcu(&f->rcu, fl_destroy_filter);
 296         else
 297                 __fl_destroy_filter(f);
 298 }
 299
 300 static void fl_destroy_sleepable(struct work_struct *work)
 301 {
 302         struct cls_fl_head *head = container_of(work, struct cls_fl_head,
 303                                                 work);
 304         if (head->mask_assigned)
 305                 rhashtable_destroy(&head->ht);
 306         kfree(head);
 307         module_put(THIS_MODULE);
 308 }
 309
 310 static void fl_destroy_rcu(struct rcu_head *rcu)
 311 {
 312         struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
 313
 314         INIT_WORK(&head->work, fl_destroy_sleepable);
 315         schedule_work(&head->work);
 316 }
 317
 318 static void fl_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 319 {
 320         struct cls_fl_head *head = rtnl_dereference(tp->root);
 321         struct cls_fl_filter *f, *next;
 322
 323         list_for_each_entry_safe(f, next, &head->filters, list)
 324                 __fl_delete(tp, f);
 325         idr_destroy(&head->handle_idr);
 326
 327         __module_get(THIS_MODULE);
 328         call_rcu(&head->rcu, fl_destroy_rcu);
 329 }
 330
 331 static void *fl_get(struct tcf_proto *tp, u32 handle)
 332 {
 333         struct cls_fl_head *head = rtnl_dereference(tp->root);
 334
 335         return idr_find_ext(&head->handle_idr, handle);
 336 }
 337
 338 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 339         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 340         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 341         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 342                                             .len = IFNAMSIZ },
 343         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 344         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 345         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 346         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 347         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 348         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 349         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 350         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 351         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 352         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 353         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 354         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 355         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 356         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 357         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 358         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 359         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 360         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 361         [TCA_FLOWER_KEY_VLAN_ID]        = { .type = NLA_U16 },
 362         [TCA_FLOWER_KEY_VLAN_PRIO]      = { .type = NLA_U8 },
 363         [TCA_FLOWER_KEY_VLAN_ETH_TYPE]  = { .type = NLA_U16 },
 364         [TCA_FLOWER_KEY_ENC_KEY_ID]     = { .type = NLA_U32 },
 365         [TCA_FLOWER_KEY_ENC_IPV4_SRC]   = { .type = NLA_U32 },
 366         [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
 367         [TCA_FLOWER_KEY_ENC_IPV4_DST]   = { .type = NLA_U32 },
 368         [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
 369         [TCA_FLOWER_KEY_ENC_IPV6_SRC]   = { .len = sizeof(struct in6_addr) },
 370         [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
 371         [TCA_FLOWER_KEY_ENC_IPV6_DST]   = { .len = sizeof(struct in6_addr) },
 372         [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
 373         [TCA_FLOWER_KEY_TCP_SRC_MASK]   = { .type = NLA_U16 },
 374         [TCA_FLOWER_KEY_TCP_DST_MASK]   = { .type = NLA_U16 },
 375         [TCA_FLOWER_KEY_UDP_SRC_MASK]   = { .type = NLA_U16 },
 376         [TCA_FLOWER_KEY_UDP_DST_MASK]   = { .type = NLA_U16 },
 377         [TCA_FLOWER_KEY_SCTP_SRC_MASK]  = { .type = NLA_U16 },
 378         [TCA_FLOWER_KEY_SCTP_DST_MASK]  = { .type = NLA_U16 },
 379         [TCA_FLOWER_KEY_SCTP_SRC]       = { .type = NLA_U16 },
 380         [TCA_FLOWER_KEY_SCTP_DST]       = { .type = NLA_U16 },
 381         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT]       = { .type = NLA_U16 },
 382         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK]  = { .type = NLA_U16 },
 383         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT]       = { .type = NLA_U16 },
 384         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK]  = { .type = NLA_U16 },
 385         [TCA_FLOWER_KEY_FLAGS]          = { .type = NLA_U32 },
 386         [TCA_FLOWER_KEY_FLAGS_MASK]     = { .type = NLA_U32 },
 387         [TCA_FLOWER_KEY_ICMPV4_TYPE]    = { .type = NLA_U8 },
 388         [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 },
 389         [TCA_FLOWER_KEY_ICMPV4_CODE]    = { .type = NLA_U8 },
 390         [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 },
 391         [TCA_FLOWER_KEY_ICMPV6_TYPE]    = { .type = NLA_U8 },
 392         [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 },
 393         [TCA_FLOWER_KEY_ICMPV6_CODE]    = { .type = NLA_U8 },
 394         [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 },
 395         [TCA_FLOWER_KEY_ARP_SIP]        = { .type = NLA_U32 },
 396         [TCA_FLOWER_KEY_ARP_SIP_MASK]   = { .type = NLA_U32 },
 397         [TCA_FLOWER_KEY_ARP_TIP]        = { .type = NLA_U32 },
 398         [TCA_FLOWER_KEY_ARP_TIP_MASK]   = { .type = NLA_U32 },
 399         [TCA_FLOWER_KEY_ARP_OP]         = { .type = NLA_U8 },
 400         [TCA_FLOWER_KEY_ARP_OP_MASK]    = { .type = NLA_U8 },
 401         [TCA_FLOWER_KEY_ARP_SHA]        = { .len = ETH_ALEN },
 402         [TCA_FLOWER_KEY_ARP_SHA_MASK]   = { .len = ETH_ALEN },
 403         [TCA_FLOWER_KEY_ARP_THA]        = { .len = ETH_ALEN },
 404         [TCA_FLOWER_KEY_ARP_THA_MASK]   = { .len = ETH_ALEN },
 405         [TCA_FLOWER_KEY_MPLS_TTL]       = { .type = NLA_U8 },
 406         [TCA_FLOWER_KEY_MPLS_BOS]       = { .type = NLA_U8 },
 407         [TCA_FLOWER_KEY_MPLS_TC]        = { .type = NLA_U8 },
 408         [TCA_FLOWER_KEY_MPLS_LABEL]     = { .type = NLA_U32 },
 409         [TCA_FLOWER_KEY_TCP_FLAGS]      = { .type = NLA_U16 },
 410         [TCA_FLOWER_KEY_TCP_FLAGS_MASK] = { .type = NLA_U16 },
 411         [TCA_FLOWER_KEY_IP_TOS]         = { .type = NLA_U8 },
 412         [TCA_FLOWER_KEY_IP_TOS_MASK]    = { .type = NLA_U8 },
 413         [TCA_FLOWER_KEY_IP_TTL]         = { .type = NLA_U8 },
 414         [TCA_FLOWER_KEY_IP_TTL_MASK]    = { .type = NLA_U8 },
 415 };
 416
 417 static void fl_set_key_val(struct nlattr **tb,
 418                            void *val, int val_type,
 419                            void *mask, int mask_type, int len)
 420 {
 421         if (!tb[val_type])
 422                 return;
 423         memcpy(val, nla_data(tb[val_type]), len);
 424         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 425                 memset(mask, 0xff, len);
 426         else
 427                 memcpy(mask, nla_data(tb[mask_type]), len);
 428 }
 429
 430 static int fl_set_key_mpls(struct nlattr **tb,
 431                            struct flow_dissector_key_mpls *key_val,
 432                            struct flow_dissector_key_mpls *key_mask)
 433 {
 434         if (tb[TCA_FLOWER_KEY_MPLS_TTL]) {
 435                 key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]);
 436                 key_mask->mpls_ttl = MPLS_TTL_MASK;
 437         }
 438         if (tb[TCA_FLOWER_KEY_MPLS_BOS]) {
 439                 u8 bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]);
 440
 441                 if (bos & ~MPLS_BOS_MASK)
 442                         return -EINVAL;
 443                 key_val->mpls_bos = bos;
 444                 key_mask->mpls_bos = MPLS_BOS_MASK;
 445         }
 446         if (tb[TCA_FLOWER_KEY_MPLS_TC]) {
 447                 u8 tc = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]);
 448
 449                 if (tc & ~MPLS_TC_MASK)
 450                         return -EINVAL;
 451                 key_val->mpls_tc = tc;
 452                 key_mask->mpls_tc = MPLS_TC_MASK;
 453         }
 454         if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) {
 455                 u32 label = nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]);
 456
 457                 if (label & ~MPLS_LABEL_MASK)
 458                         return -EINVAL;
 459                 key_val->mpls_label = label;
 460                 key_mask->mpls_label = MPLS_LABEL_MASK;
 461         }
 462         return 0;
 463 }
 464
 465 static void fl_set_key_vlan(struct nlattr **tb,
 466                             struct flow_dissector_key_vlan *key_val,
 467                             struct flow_dissector_key_vlan *key_mask)
 468 {
 469 #define VLAN_PRIORITY_MASK      0x7
 470
 471         if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
 472                 key_val->vlan_id =
 473                         nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
 474                 key_mask->vlan_id = VLAN_VID_MASK;
 475         }
 476         if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
 477                 key_val->vlan_priority =
 478                         nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
 479                         VLAN_PRIORITY_MASK;
 480                 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
 481         }
 482 }
 483
 484 static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
 485                             u32 *dissector_key, u32 *dissector_mask,
 486                             u32 flower_flag_bit, u32 dissector_flag_bit)
 487 {
 488         if (flower_mask & flower_flag_bit) {
 489                 *dissector_mask |= dissector_flag_bit;
 490                 if (flower_key & flower_flag_bit)
 491                         *dissector_key |= dissector_flag_bit;
 492         }
 493 }
 494
 495 static int fl_set_key_flags(struct nlattr **tb,
 496                             u32 *flags_key, u32 *flags_mask)
 497 {
 498         u32 key, mask;
 499
 500         /* mask is mandatory for flags */
 501         if (!tb[TCA_FLOWER_KEY_FLAGS_MASK])
 502                 return -EINVAL;
 503
 504         key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS]));
 505         mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
 506
 507         *flags_key  = 0;
 508         *flags_mask = 0;
 509
 510         fl_set_key_flag(key, mask, flags_key, flags_mask,
 511                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
 512
 513         return 0;
 514 }
 515
 516 static void fl_set_key_ip(struct nlattr **tb,
 517                           struct flow_dissector_key_ip *key,
 518                           struct flow_dissector_key_ip *mask)
 519 {
 520                 fl_set_key_val(tb, &key->tos, TCA_FLOWER_KEY_IP_TOS,
 521                                &mask->tos, TCA_FLOWER_KEY_IP_TOS_MASK,
 522                                sizeof(key->tos));
 523
 524                 fl_set_key_val(tb, &key->ttl, TCA_FLOWER_KEY_IP_TTL,
 525                                &mask->ttl, TCA_FLOWER_KEY_IP_TTL_MASK,
 526                                sizeof(key->ttl));
 527 }
 528
 529 static int fl_set_key(struct net *net, struct nlattr **tb,
 530                       struct fl_flow_key *key, struct fl_flow_key *mask,
 531                       struct netlink_ext_ack *extack)
 532 {
 533         __be16 ethertype;
 534         int ret = 0;
 535 #ifdef CONFIG_NET_CLS_IND
 536         if (tb[TCA_FLOWER_INDEV]) {
 537                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV], extack);
 538                 if (err < 0)
 539                         return err;
 540                 key->indev_ifindex = err;
 541                 mask->indev_ifindex = 0xffffffff;
 542         }
 543 #endif
 544
 545         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 546                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 547                        sizeof(key->eth.dst));
 548         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 549                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 550                        sizeof(key->eth.src));
 551
 552         if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
 553                 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
 554
 555                 if (ethertype == htons(ETH_P_8021Q)) {
 556                         fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
 557                         fl_set_key_val(tb, &key->basic.n_proto,
 558                                        TCA_FLOWER_KEY_VLAN_ETH_TYPE,
 559                                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 560                                        sizeof(key->basic.n_proto));
 561                 } else {
 562                         key->basic.n_proto = ethertype;
 563                         mask->basic.n_proto = cpu_to_be16(~0);
 564                 }
 565         }
 566
 567         if (key->basic.n_proto == htons(ETH_P_IP) ||
 568             key->basic.n_proto == htons(ETH_P_IPV6)) {
 569                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 570                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 571                                sizeof(key->basic.ip_proto));
 572                 fl_set_key_ip(tb, &key->ip, &mask->ip);
 573         }
 574
 575         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 576                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 577                 mask->control.addr_type = ~0;
 578                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 579                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 580                                sizeof(key->ipv4.src));
 581                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 582                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 583                                sizeof(key->ipv4.dst));
 584         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 585                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 586                 mask->control.addr_type = ~0;
 587                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 588                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 589                                sizeof(key->ipv6.src));
 590                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 591                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 592                                sizeof(key->ipv6.dst));
 593         }
 594
 595         if (key->basic.ip_proto == IPPROTO_TCP) {
 596                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 597                                &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
 598                                sizeof(key->tp.src));
 599                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 600                                &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 601                                sizeof(key->tp.dst));
 602                 fl_set_key_val(tb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
 603                                &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
 604                                sizeof(key->tcp.flags));
 605         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 606                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 607                                &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
 608                                sizeof(key->tp.src));
 609                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 610                                &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
 611                                sizeof(key->tp.dst));
 612         } else if (key->basic.ip_proto == IPPROTO_SCTP) {
 613                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
 614                                &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
 615                                sizeof(key->tp.src));
 616                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
 617                                &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
 618                                sizeof(key->tp.dst));
 619         } else if (key->basic.n_proto == htons(ETH_P_IP) &&
 620                    key->basic.ip_proto == IPPROTO_ICMP) {
 621                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV4_TYPE,
 622                                &mask->icmp.type,
 623                                TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
 624                                sizeof(key->icmp.type));
 625                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE,
 626                                &mask->icmp.code,
 627                                TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
 628                                sizeof(key->icmp.code));
 629         } else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
 630                    key->basic.ip_proto == IPPROTO_ICMPV6) {
 631                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV6_TYPE,
 632                                &mask->icmp.type,
 633                                TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
 634                                sizeof(key->icmp.type));
 635                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV6_CODE,
 636                                &mask->icmp.code,
 637                                TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
 638                                sizeof(key->icmp.code));
 639         } else if (key->basic.n_proto == htons(ETH_P_MPLS_UC) ||
 640                    key->basic.n_proto == htons(ETH_P_MPLS_MC)) {
 641                 ret = fl_set_key_mpls(tb, &key->mpls, &mask->mpls);
 642                 if (ret)
 643                         return ret;
 644         } else if (key->basic.n_proto == htons(ETH_P_ARP) ||
 645                    key->basic.n_proto == htons(ETH_P_RARP)) {
 646                 fl_set_key_val(tb, &key->arp.sip, TCA_FLOWER_KEY_ARP_SIP,
 647                                &mask->arp.sip, TCA_FLOWER_KEY_ARP_SIP_MASK,
 648                                sizeof(key->arp.sip));
 649                 fl_set_key_val(tb, &key->arp.tip, TCA_FLOWER_KEY_ARP_TIP,
 650                                &mask->arp.tip, TCA_FLOWER_KEY_ARP_TIP_MASK,
 651                                sizeof(key->arp.tip));
 652                 fl_set_key_val(tb, &key->arp.op, TCA_FLOWER_KEY_ARP_OP,
 653                                &mask->arp.op, TCA_FLOWER_KEY_ARP_OP_MASK,
 654                                sizeof(key->arp.op));
 655                 fl_set_key_val(tb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
 656                                mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
 657                                sizeof(key->arp.sha));
 658                 fl_set_key_val(tb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
 659                                mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
 660                                sizeof(key->arp.tha));
 661         }
 662
 663         if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
 664             tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
 665                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 666                 mask->enc_control.addr_type = ~0;
 667                 fl_set_key_val(tb, &key->enc_ipv4.src,
 668                                TCA_FLOWER_KEY_ENC_IPV4_SRC,
 669                                &mask->enc_ipv4.src,
 670                                TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
 671                                sizeof(key->enc_ipv4.src));
 672                 fl_set_key_val(tb, &key->enc_ipv4.dst,
 673                                TCA_FLOWER_KEY_ENC_IPV4_DST,
 674                                &mask->enc_ipv4.dst,
 675                                TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
 676                                sizeof(key->enc_ipv4.dst));
 677         }
 678
 679         if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] ||
 680             tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) {
 681                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 682                 mask->enc_control.addr_type = ~0;
 683                 fl_set_key_val(tb, &key->enc_ipv6.src,
 684                                TCA_FLOWER_KEY_ENC_IPV6_SRC,
 685                                &mask->enc_ipv6.src,
 686                                TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
 687                                sizeof(key->enc_ipv6.src));
 688                 fl_set_key_val(tb, &key->enc_ipv6.dst,
 689                                TCA_FLOWER_KEY_ENC_IPV6_DST,
 690                                &mask->enc_ipv6.dst,
 691                                TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
 692                                sizeof(key->enc_ipv6.dst));
 693         }
 694
 695         fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID,
 696                        &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC,
 697                        sizeof(key->enc_key_id.keyid));
 698
 699         fl_set_key_val(tb, &key->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
 700                        &mask->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
 701                        sizeof(key->enc_tp.src));
 702
 703         fl_set_key_val(tb, &key->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
 704                        &mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
 705                        sizeof(key->enc_tp.dst));
 706
 707         if (tb[TCA_FLOWER_KEY_FLAGS])
 708                 ret = fl_set_key_flags(tb, &key->control.flags, &mask->control.flags);
 709
 710         return ret;
 711 }
 712
 713 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 714                        struct fl_flow_mask *mask2)
 715 {
 716         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 717         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 718
 719         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 720                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 721 }
 722
 723 static const struct rhashtable_params fl_ht_params = {
 724         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 725         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 726         .automatic_shrinking = true,
 727 };
 728
 729 static int fl_init_hashtable(struct cls_fl_head *head,
 730                              struct fl_flow_mask *mask)
 731 {
 732         head->ht_params = fl_ht_params;
 733         head->ht_params.key_len = fl_mask_range(mask);
 734         head->ht_params.key_offset += mask->range.start;
 735
 736         return rhashtable_init(&head->ht, &head->ht_params);
 737 }
 738
 739 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 740 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 741
 742 #define FL_KEY_IS_MASKED(mask, member)                                          \
 743         memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),               \
 744                    0, FL_KEY_MEMBER_SIZE(member))                               \
 745
 746 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 747         do {                                                                    \
 748                 keys[cnt].key_id = id;                                          \
 749                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 750                 cnt++;                                                          \
 751         } while(0);
 752
 753 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)                       \
 754         do {                                                                    \
 755                 if (FL_KEY_IS_MASKED(mask, member))                             \
 756                         FL_KEY_SET(keys, cnt, id, member);                      \
 757         } while(0);
 758
 759 static void fl_init_dissector(struct cls_fl_head *head,
 760                               struct fl_flow_mask *mask)
 761 {
 762         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 763         size_t cnt = 0;
 764
 765         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 766         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 767         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 768                              FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 769         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 770                              FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 771         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 772                              FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 773         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 774                              FLOW_DISSECTOR_KEY_PORTS, tp);
 775         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 776                              FLOW_DISSECTOR_KEY_IP, ip);
 777         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 778                              FLOW_DISSECTOR_KEY_TCP, tcp);
 779         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 780                              FLOW_DISSECTOR_KEY_ICMP, icmp);
 781         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 782                              FLOW_DISSECTOR_KEY_ARP, arp);
 783         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 784                              FLOW_DISSECTOR_KEY_MPLS, mpls);
 785         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 786                              FLOW_DISSECTOR_KEY_VLAN, vlan);
 787         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 788                              FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
 789         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 790                              FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
 791         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 792                              FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
 793         if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) ||
 794             FL_KEY_IS_MASKED(&mask->key, enc_ipv6))
 795                 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL,
 796                            enc_control);
 797         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 798                              FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
 799
 800         skb_flow_dissector_init(&head->dissector, keys, cnt);
 801 }
 802
 803 static int fl_check_assign_mask(struct cls_fl_head *head,
 804                                 struct fl_flow_mask *mask)
 805 {
 806         int err;
 807
 808         if (head->mask_assigned) {
 809                 if (!fl_mask_eq(&head->mask, mask))
 810                         return -EINVAL;
 811                 else
 812                         return 0;
 813         }
 814
 815         /* Mask is not assigned yet. So assign it and init hashtable
 816          * according to that.
 817          */
 818         err = fl_init_hashtable(head, mask);
 819         if (err)
 820                 return err;
 821         memcpy(&head->mask, mask, sizeof(head->mask));
 822         head->mask_assigned = true;
 823
 824         fl_init_dissector(head, mask);
 825
 826         return 0;
 827 }
 828
 829 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 830                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 831                         unsigned long base, struct nlattr **tb,
 832                         struct nlattr *est, bool ovr,
 833                         struct netlink_ext_ack *extack)
 834 {
 835         int err;
 836
 837         err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
 838         if (err < 0)
 839                 return err;
 840
 841         if (tb[TCA_FLOWER_CLASSID]) {
 842                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 843                 tcf_bind_filter(tp, &f->res, base);
 844         }
 845
 846         err = fl_set_key(net, tb, &f->key, &mask->key, extack);
 847         if (err)
 848                 return err;
 849
 850         fl_mask_update_range(mask);
 851         fl_set_masked_key(&f->mkey, &f->key, mask);
 852
 853         return 0;
 854 }
 855
 856 static int fl_change(struct net *net, struct sk_buff *in_skb,
 857                      struct tcf_proto *tp, unsigned long base,
 858                      u32 handle, struct nlattr **tca,
 859                      void **arg, bool ovr, struct netlink_ext_ack *extack)
 860 {
 861         struct cls_fl_head *head = rtnl_dereference(tp->root);
 862         struct cls_fl_filter *fold = *arg;
 863         struct cls_fl_filter *fnew;
 864         struct nlattr **tb;
 865         struct fl_flow_mask mask = {};
 866         unsigned long idr_index;
 867         int err;
 868
 869         if (!tca[TCA_OPTIONS])
 870                 return -EINVAL;
 871
 872         tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
 873         if (!tb)
 874                 return -ENOBUFS;
 875
 876         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
 877                                fl_policy, NULL);
 878         if (err < 0)
 879                 goto errout_tb;
 880
 881         if (fold && handle && fold->handle != handle) {
 882                 err = -EINVAL;
 883                 goto errout_tb;
 884         }
 885
 886         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 887         if (!fnew) {
 888                 err = -ENOBUFS;
 889                 goto errout_tb;
 890         }
 891
 892         err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 893         if (err < 0)
 894                 goto errout;
 895
 896         if (!handle) {
 897                 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
 898                                     1, 0x80000000, GFP_KERNEL);
 899                 if (err)
 900                         goto errout;
 901                 fnew->handle = idr_index;
 902         }
 903
 904         /* user specifies a handle and it doesn't exist */
 905         if (handle && !fold) {
 906                 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
 907                                     handle, handle + 1, GFP_KERNEL);
 908                 if (err)
 909                         goto errout;
 910                 fnew->handle = idr_index;
 911         }
 912
 913         if (tb[TCA_FLOWER_FLAGS]) {
 914                 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 915
 916                 if (!tc_flags_valid(fnew->flags)) {
 917                         err = -EINVAL;
 918                         goto errout_idr;
 919                 }
 920         }
 921
 922         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr,
 923                            extack);
 924         if (err)
 925                 goto errout_idr;
 926
 927         err = fl_check_assign_mask(head, &mask);
 928         if (err)
 929                 goto errout_idr;
 930
 931         if (!tc_skip_sw(fnew->flags)) {
 932                 if (!fold && fl_lookup(head, &fnew->mkey)) {
 933                         err = -EEXIST;
 934                         goto errout_idr;
 935                 }
 936
 937                 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 938                                              head->ht_params);
 939                 if (err)
 940                         goto errout_idr;
 941         }
 942
 943         if (!tc_skip_hw(fnew->flags)) {
 944                 err = fl_hw_replace_filter(tp,
 945                                            &head->dissector,
 946                                            &mask.key,
 947                                            fnew,
 948                                            extack);
 949                 if (err)
 950                         goto errout_idr;
 951         }
 952
 953         if (!tc_in_hw(fnew->flags))
 954                 fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 955
 956         if (fold) {
 957                 if (!tc_skip_sw(fold->flags))
 958                         rhashtable_remove_fast(&head->ht, &fold->ht_node,
 959                                                head->ht_params);
 960                 if (!tc_skip_hw(fold->flags))
 961                         fl_hw_destroy_filter(tp, fold);
 962         }
 963
 964         *arg = fnew;
 965
 966         if (fold) {
 967                 fnew->handle = handle;
 968                 idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
 969                 list_replace_rcu(&fold->list, &fnew->list);
 970                 tcf_unbind_filter(tp, &fold->res);
 971                 tcf_exts_get_net(&fold->exts);
 972                 call_rcu(&fold->rcu, fl_destroy_filter);
 973         } else {
 974                 list_add_tail_rcu(&fnew->list, &head->filters);
 975         }
 976
 977         kfree(tb);
 978         return 0;
 979
 980 errout_idr:
 981         if (fnew->handle)
 982                 idr_remove_ext(&head->handle_idr, fnew->handle);
 983 errout:
 984         tcf_exts_destroy(&fnew->exts);
 985         kfree(fnew);
 986 errout_tb:
 987         kfree(tb);
 988         return err;
 989 }
 990
 991 static int fl_delete(struct tcf_proto *tp, void *arg, bool *last,
 992                      struct netlink_ext_ack *extack)
 993 {
 994         struct cls_fl_head *head = rtnl_dereference(tp->root);
 995         struct cls_fl_filter *f = arg;
 996
 997         if (!tc_skip_sw(f->flags))
 998                 rhashtable_remove_fast(&head->ht, &f->ht_node,
 999                                        head->ht_params);
1000         __fl_delete(tp, f);
1001         *last = list_empty(&head->filters);
1002         return 0;
1003 }
1004
1005 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1006 {
1007         struct cls_fl_head *head = rtnl_dereference(tp->root);
1008         struct cls_fl_filter *f;
1009
1010         list_for_each_entry_rcu(f, &head->filters, list) {
1011                 if (arg->count < arg->skip)
1012                         goto skip;
1013                 if (arg->fn(tp, f, arg) < 0) {
1014                         arg->stop = 1;
1015                         break;
1016                 }
1017 skip:
1018                 arg->count++;
1019         }
1020 }
1021
1022 static int fl_dump_key_val(struct sk_buff *skb,
1023                            void *val, int val_type,
1024                            void *mask, int mask_type, int len)
1025 {
1026         int err;
1027
1028         if (!memchr_inv(mask, 0, len))
1029                 return 0;
1030         err = nla_put(skb, val_type, len, val);
1031         if (err)
1032                 return err;
1033         if (mask_type != TCA_FLOWER_UNSPEC) {
1034                 err = nla_put(skb, mask_type, len, mask);
1035                 if (err)
1036                         return err;
1037         }
1038         return 0;
1039 }
1040
1041 static int fl_dump_key_mpls(struct sk_buff *skb,
1042                             struct flow_dissector_key_mpls *mpls_key,
1043                             struct flow_dissector_key_mpls *mpls_mask)
1044 {
1045         int err;
1046
1047         if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask)))
1048                 return 0;
1049         if (mpls_mask->mpls_ttl) {
1050                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL,
1051                                  mpls_key->mpls_ttl);
1052                 if (err)
1053                         return err;
1054         }
1055         if (mpls_mask->mpls_tc) {
1056                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC,
1057                                  mpls_key->mpls_tc);
1058                 if (err)
1059                         return err;
1060         }
1061         if (mpls_mask->mpls_label) {
1062                 err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL,
1063                                   mpls_key->mpls_label);
1064                 if (err)
1065                         return err;
1066         }
1067         if (mpls_mask->mpls_bos) {
1068                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS,
1069                                  mpls_key->mpls_bos);
1070                 if (err)
1071                         return err;
1072         }
1073         return 0;
1074 }
1075
1076 static int fl_dump_key_ip(struct sk_buff *skb,
1077                           struct flow_dissector_key_ip *key,
1078                           struct flow_dissector_key_ip *mask)
1079 {
1080         if (fl_dump_key_val(skb, &key->tos, TCA_FLOWER_KEY_IP_TOS, &mask->tos,
1081                             TCA_FLOWER_KEY_IP_TOS_MASK, sizeof(key->tos)) ||
1082             fl_dump_key_val(skb, &key->ttl, TCA_FLOWER_KEY_IP_TTL, &mask->ttl,
1083                             TCA_FLOWER_KEY_IP_TTL_MASK, sizeof(key->ttl)))
1084                 return -1;
1085
1086         return 0;
1087 }
1088
1089 static int fl_dump_key_vlan(struct sk_buff *skb,
1090                             struct flow_dissector_key_vlan *vlan_key,
1091                             struct flow_dissector_key_vlan *vlan_mask)
1092 {
1093         int err;
1094
1095         if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
1096                 return 0;
1097         if (vlan_mask->vlan_id) {
1098                 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
1099                                   vlan_key->vlan_id);
1100                 if (err)
1101                         return err;
1102         }
1103         if (vlan_mask->vlan_priority) {
1104                 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
1105                                  vlan_key->vlan_priority);
1106                 if (err)
1107                         return err;
1108         }
1109         return 0;
1110 }
1111
1112 static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
1113                             u32 *flower_key, u32 *flower_mask,
1114                             u32 flower_flag_bit, u32 dissector_flag_bit)
1115 {
1116         if (dissector_mask & dissector_flag_bit) {
1117                 *flower_mask |= flower_flag_bit;
1118                 if (dissector_key & dissector_flag_bit)
1119                         *flower_key |= flower_flag_bit;
1120         }
1121 }
1122
1123 static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
1124 {
1125         u32 key, mask;
1126         __be32 _key, _mask;
1127         int err;
1128
1129         if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
1130                 return 0;
1131
1132         key = 0;
1133         mask = 0;
1134
1135         fl_get_key_flag(flags_key, flags_mask, &key, &mask,
1136                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
1137
1138         _key = cpu_to_be32(key);
1139         _mask = cpu_to_be32(mask);
1140
1141         err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
1142         if (err)
1143                 return err;
1144
1145         return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
1146 }
1147
1148 static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
1149                    struct sk_buff *skb, struct tcmsg *t)
1150 {
1151         struct cls_fl_head *head = rtnl_dereference(tp->root);
1152         struct cls_fl_filter *f = fh;
1153         struct nlattr *nest;
1154         struct fl_flow_key *key, *mask;
1155
1156         if (!f)
1157                 return skb->len;
1158
1159         t->tcm_handle = f->handle;
1160
1161         nest = nla_nest_start(skb, TCA_OPTIONS);
1162         if (!nest)
1163                 goto nla_put_failure;
1164
1165         if (f->res.classid &&
1166             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
1167                 goto nla_put_failure;
1168
1169         key = &f->key;
1170         mask = &head->mask.key;
1171
1172         if (mask->indev_ifindex) {
1173                 struct net_device *dev;
1174
1175                 dev = __dev_get_by_index(net, key->indev_ifindex);
1176                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
1177                         goto nla_put_failure;
1178         }
1179
1180         if (!tc_skip_hw(f->flags))
1181                 fl_hw_update_stats(tp, f);
1182
1183         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
1184                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
1185                             sizeof(key->eth.dst)) ||
1186             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
1187                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
1188                             sizeof(key->eth.src)) ||
1189             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
1190                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
1191                             sizeof(key->basic.n_proto)))
1192                 goto nla_put_failure;
1193
1194         if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls))
1195                 goto nla_put_failure;
1196
1197         if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
1198                 goto nla_put_failure;
1199
1200         if ((key->basic.n_proto == htons(ETH_P_IP) ||
1201              key->basic.n_proto == htons(ETH_P_IPV6)) &&
1202             (fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
1203                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
1204                             sizeof(key->basic.ip_proto)) ||
1205             fl_dump_key_ip(skb, &key->ip, &mask->ip)))
1206                 goto nla_put_failure;
1207
1208         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1209             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
1210                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
1211                              sizeof(key->ipv4.src)) ||
1212              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
1213                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
1214                              sizeof(key->ipv4.dst))))
1215                 goto nla_put_failure;
1216         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1217                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
1218                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
1219                                   sizeof(key->ipv6.src)) ||
1220                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
1221                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
1222                                   sizeof(key->ipv6.dst))))
1223                 goto nla_put_failure;
1224
1225         if (key->basic.ip_proto == IPPROTO_TCP &&
1226             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
1227                              &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
1228                              sizeof(key->tp.src)) ||
1229              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
1230                              &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
1231                              sizeof(key->tp.dst)) ||
1232              fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
1233                              &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
1234                              sizeof(key->tcp.flags))))
1235                 goto nla_put_failure;
1236         else if (key->basic.ip_proto == IPPROTO_UDP &&
1237                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
1238                                   &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
1239                                   sizeof(key->tp.src)) ||
1240                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
1241                                   &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
1242                                   sizeof(key->tp.dst))))
1243                 goto nla_put_failure;
1244         else if (key->basic.ip_proto == IPPROTO_SCTP &&
1245                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
1246                                   &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
1247                                   sizeof(key->tp.src)) ||
1248                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
1249                                   &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
1250                                   sizeof(key->tp.dst))))
1251                 goto nla_put_failure;
1252         else if (key->basic.n_proto == htons(ETH_P_IP) &&
1253                  key->basic.ip_proto == IPPROTO_ICMP &&
1254                  (fl_dump_key_val(skb, &key->icmp.type,
1255                                   TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type,
1256                                   TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
1257                                   sizeof(key->icmp.type)) ||
1258                   fl_dump_key_val(skb, &key->icmp.code,
1259                                   TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code,
1260                                   TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
1261                                   sizeof(key->icmp.code))))
1262                 goto nla_put_failure;
1263         else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
1264                  key->basic.ip_proto == IPPROTO_ICMPV6 &&
1265                  (fl_dump_key_val(skb, &key->icmp.type,
1266                                   TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type,
1267                                   TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
1268                                   sizeof(key->icmp.type)) ||
1269                   fl_dump_key_val(skb, &key->icmp.code,
1270                                   TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code,
1271                                   TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
1272                                   sizeof(key->icmp.code))))
1273                 goto nla_put_failure;
1274         else if ((key->basic.n_proto == htons(ETH_P_ARP) ||
1275                   key->basic.n_proto == htons(ETH_P_RARP)) &&
1276                  (fl_dump_key_val(skb, &key->arp.sip,
1277                                   TCA_FLOWER_KEY_ARP_SIP, &mask->arp.sip,
1278                                   TCA_FLOWER_KEY_ARP_SIP_MASK,
1279                                   sizeof(key->arp.sip)) ||
1280                   fl_dump_key_val(skb, &key->arp.tip,
1281                                   TCA_FLOWER_KEY_ARP_TIP, &mask->arp.tip,
1282                                   TCA_FLOWER_KEY_ARP_TIP_MASK,
1283                                   sizeof(key->arp.tip)) ||
1284                   fl_dump_key_val(skb, &key->arp.op,
1285                                   TCA_FLOWER_KEY_ARP_OP, &mask->arp.op,
1286                                   TCA_FLOWER_KEY_ARP_OP_MASK,
1287                                   sizeof(key->arp.op)) ||
1288                   fl_dump_key_val(skb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
1289                                   mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
1290                                   sizeof(key->arp.sha)) ||
1291                   fl_dump_key_val(skb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
1292                                   mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
1293                                   sizeof(key->arp.tha))))
1294                 goto nla_put_failure;
1295
1296         if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1297             (fl_dump_key_val(skb, &key->enc_ipv4.src,
1298                             TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
1299                             TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
1300                             sizeof(key->enc_ipv4.src)) ||
1301              fl_dump_key_val(skb, &key->enc_ipv4.dst,
1302                              TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
1303                              TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
1304                              sizeof(key->enc_ipv4.dst))))
1305                 goto nla_put_failure;
1306         else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1307                  (fl_dump_key_val(skb, &key->enc_ipv6.src,
1308                             TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
1309                             TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
1310                             sizeof(key->enc_ipv6.src)) ||
1311                  fl_dump_key_val(skb, &key->enc_ipv6.dst,
1312                                  TCA_FLOWER_KEY_ENC_IPV6_DST,
1313                                  &mask->enc_ipv6.dst,
1314                                  TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
1315                             sizeof(key->enc_ipv6.dst))))
1316                 goto nla_put_failure;
1317
1318         if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
1319                             &mask->enc_key_id, TCA_FLOWER_UNSPEC,
1320                             sizeof(key->enc_key_id)) ||
1321             fl_dump_key_val(skb, &key->enc_tp.src,
1322                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
1323                             &mask->enc_tp.src,
1324                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
1325                             sizeof(key->enc_tp.src)) ||
1326             fl_dump_key_val(skb, &key->enc_tp.dst,
1327                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
1328                             &mask->enc_tp.dst,
1329                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
1330                             sizeof(key->enc_tp.dst)))
1331                 goto nla_put_failure;
1332
1333         if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
1334                 goto nla_put_failure;
1335
1336         if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
1337                 goto nla_put_failure;
1338
1339         if (tcf_exts_dump(skb, &f->exts))
1340                 goto nla_put_failure;
1341
1342         nla_nest_end(skb, nest);
1343
1344         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
1345                 goto nla_put_failure;
1346
1347         return skb->len;
1348
1349 nla_put_failure:
1350         nla_nest_cancel(skb, nest);
1351         return -1;
1352 }
1353
1354 static void fl_bind_class(void *fh, u32 classid, unsigned long cl)
1355 {
1356         struct cls_fl_filter *f = fh;
1357
1358         if (f && f->res.classid == classid)
1359                 f->res.class = cl;
1360 }
1361
1362 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
1363         .kind           = "flower",
1364         .classify       = fl_classify,
1365         .init           = fl_init,
1366         .destroy        = fl_destroy,
1367         .get            = fl_get,
1368         .change         = fl_change,
1369         .delete         = fl_delete,
1370         .walk           = fl_walk,
1371         .dump           = fl_dump,
1372         .bind_class     = fl_bind_class,
1373         .owner          = THIS_MODULE,
1374 };
1375
1376 static int __init cls_fl_init(void)
1377 {
1378         return register_tcf_proto_ops(&cls_fl_ops);
1379 }
1380
1381 static void __exit cls_fl_exit(void)
1382 {
1383         unregister_tcf_proto_ops(&cls_fl_ops);
1384 }
1385
1386 module_init(cls_fl_init);
1387 module_exit(cls_fl_exit);
1388
1389 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
1390 MODULE_DESCRIPTION("Flower classifier");
1391 MODULE_LICENSE("GPL v2");