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         struct rcu_head rcu;
  91         struct net_device *hw_dev;
  92 };
  93
  94 static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
  95 {
  96         return mask->range.end - mask->range.start;
  97 }
  98
  99 static void fl_mask_update_range(struct fl_flow_mask *mask)
 100 {
 101         const u8 *bytes = (const u8 *) &mask->key;
 102         size_t size = sizeof(mask->key);
 103         size_t i, first = 0, last = size - 1;
 104
 105         for (i = 0; i < sizeof(mask->key); i++) {
 106                 if (bytes[i]) {
 107                         if (!first && i)
 108                                 first = i;
 109                         last = i;
 110                 }
 111         }
 112         mask->range.start = rounddown(first, sizeof(long));
 113         mask->range.end = roundup(last + 1, sizeof(long));
 114 }
 115
 116 static void *fl_key_get_start(struct fl_flow_key *key,
 117                               const struct fl_flow_mask *mask)
 118 {
 119         return (u8 *) key + mask->range.start;
 120 }
 121
 122 static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
 123                               struct fl_flow_mask *mask)
 124 {
 125         const long *lkey = fl_key_get_start(key, mask);
 126         const long *lmask = fl_key_get_start(&mask->key, mask);
 127         long *lmkey = fl_key_get_start(mkey, mask);
 128         int i;
 129
 130         for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
 131                 *lmkey++ = *lkey++ & *lmask++;
 132 }
 133
 134 static void fl_clear_masked_range(struct fl_flow_key *key,
 135                                   struct fl_flow_mask *mask)
 136 {
 137         memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
 138 }
 139
 140 static struct cls_fl_filter *fl_lookup(struct cls_fl_head *head,
 141                                        struct fl_flow_key *mkey)
 142 {
 143         return rhashtable_lookup_fast(&head->ht,
 144                                       fl_key_get_start(mkey, &head->mask),
 145                                       head->ht_params);
 146 }
 147
 148 static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 149                        struct tcf_result *res)
 150 {
 151         struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 152         struct cls_fl_filter *f;
 153         struct fl_flow_key skb_key;
 154         struct fl_flow_key skb_mkey;
 155         struct ip_tunnel_info *info;
 156
 157         if (!atomic_read(&head->ht.nelems))
 158                 return -1;
 159
 160         fl_clear_masked_range(&skb_key, &head->mask);
 161
 162         info = skb_tunnel_info(skb);
 163         if (info) {
 164                 struct ip_tunnel_key *key = &info->key;
 165
 166                 switch (ip_tunnel_info_af(info)) {
 167                 case AF_INET:
 168                         skb_key.enc_control.addr_type =
 169                                 FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 170                         skb_key.enc_ipv4.src = key->u.ipv4.src;
 171                         skb_key.enc_ipv4.dst = key->u.ipv4.dst;
 172                         break;
 173                 case AF_INET6:
 174                         skb_key.enc_control.addr_type =
 175                                 FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 176                         skb_key.enc_ipv6.src = key->u.ipv6.src;
 177                         skb_key.enc_ipv6.dst = key->u.ipv6.dst;
 178                         break;
 179                 }
 180
 181                 skb_key.enc_key_id.keyid = tunnel_id_to_key32(key->tun_id);
 182                 skb_key.enc_tp.src = key->tp_src;
 183                 skb_key.enc_tp.dst = key->tp_dst;
 184         }
 185
 186         skb_key.indev_ifindex = skb->skb_iif;
 187         /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
 188          * so do it rather here.
 189          */
 190         skb_key.basic.n_proto = skb->protocol;
 191         skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
 192
 193         fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
 194
 195         f = fl_lookup(head, &skb_mkey);
 196         if (f && !tc_skip_sw(f->flags)) {
 197                 *res = f->res;
 198                 return tcf_exts_exec(skb, &f->exts, res);
 199         }
 200         return -1;
 201 }
 202
 203 static int fl_init(struct tcf_proto *tp)
 204 {
 205         struct cls_fl_head *head;
 206
 207         head = kzalloc(sizeof(*head), GFP_KERNEL);
 208         if (!head)
 209                 return -ENOBUFS;
 210
 211         INIT_LIST_HEAD_RCU(&head->filters);
 212         rcu_assign_pointer(tp->root, head);
 213         idr_init(&head->handle_idr);
 214
 215         return 0;
 216 }
 217
 218 static void fl_destroy_filter(struct rcu_head *head)
 219 {
 220         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 221
 222         tcf_exts_destroy(&f->exts);
 223         kfree(f);
 224 }
 225
 226 static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f)
 227 {
 228         struct tc_cls_flower_offload cls_flower = {};
 229         struct net_device *dev = f->hw_dev;
 230
 231         if (!tc_can_offload(dev))
 232                 return;
 233
 234         tc_cls_common_offload_init(&cls_flower.common, tp);
 235         cls_flower.command = TC_CLSFLOWER_DESTROY;
 236         cls_flower.cookie = (unsigned long) f;
 237
 238         dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER, &cls_flower);
 239 }
 240
 241 static int fl_hw_replace_filter(struct tcf_proto *tp,
 242                                 struct flow_dissector *dissector,
 243                                 struct fl_flow_key *mask,
 244                                 struct cls_fl_filter *f)
 245 {
 246         struct net_device *dev = tp->q->dev_queue->dev;
 247         struct tc_cls_flower_offload cls_flower = {};
 248         int err;
 249
 250         if (!tc_can_offload(dev)) {
 251                 if (tcf_exts_get_dev(dev, &f->exts, &f->hw_dev) ||
 252                     (f->hw_dev && !tc_can_offload(f->hw_dev))) {
 253                         f->hw_dev = dev;
 254                         return tc_skip_sw(f->flags) ? -EINVAL : 0;
 255                 }
 256                 dev = f->hw_dev;
 257                 cls_flower.egress_dev = true;
 258         } else {
 259                 f->hw_dev = dev;
 260         }
 261
 262         tc_cls_common_offload_init(&cls_flower.common, tp);
 263         cls_flower.command = TC_CLSFLOWER_REPLACE;
 264         cls_flower.cookie = (unsigned long) f;
 265         cls_flower.dissector = dissector;
 266         cls_flower.mask = mask;
 267         cls_flower.key = &f->mkey;
 268         cls_flower.exts = &f->exts;
 269
 270         err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER,
 271                                             &cls_flower);
 272         if (!err)
 273                 f->flags |= TCA_CLS_FLAGS_IN_HW;
 274
 275         if (tc_skip_sw(f->flags))
 276                 return err;
 277         return 0;
 278 }
 279
 280 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 281 {
 282         struct tc_cls_flower_offload cls_flower = {};
 283         struct net_device *dev = f->hw_dev;
 284
 285         if (!tc_can_offload(dev))
 286                 return;
 287
 288         tc_cls_common_offload_init(&cls_flower.common, tp);
 289         cls_flower.command = TC_CLSFLOWER_STATS;
 290         cls_flower.cookie = (unsigned long) f;
 291         cls_flower.exts = &f->exts;
 292
 293         dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSFLOWER,
 294                                       &cls_flower);
 295 }
 296
 297 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
 298 {
 299         struct cls_fl_head *head = rtnl_dereference(tp->root);
 300
 301         idr_remove_ext(&head->handle_idr, f->handle);
 302         list_del_rcu(&f->list);
 303         if (!tc_skip_hw(f->flags))
 304                 fl_hw_destroy_filter(tp, f);
 305         tcf_unbind_filter(tp, &f->res);
 306         call_rcu(&f->rcu, fl_destroy_filter);
 307 }
 308
 309 static void fl_destroy_sleepable(struct work_struct *work)
 310 {
 311         struct cls_fl_head *head = container_of(work, struct cls_fl_head,
 312                                                 work);
 313         if (head->mask_assigned)
 314                 rhashtable_destroy(&head->ht);
 315         kfree(head);
 316         module_put(THIS_MODULE);
 317 }
 318
 319 static void fl_destroy_rcu(struct rcu_head *rcu)
 320 {
 321         struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
 322
 323         INIT_WORK(&head->work, fl_destroy_sleepable);
 324         schedule_work(&head->work);
 325 }
 326
 327 static void fl_destroy(struct tcf_proto *tp)
 328 {
 329         struct cls_fl_head *head = rtnl_dereference(tp->root);
 330         struct cls_fl_filter *f, *next;
 331
 332         list_for_each_entry_safe(f, next, &head->filters, list)
 333                 __fl_delete(tp, f);
 334         idr_destroy(&head->handle_idr);
 335
 336         __module_get(THIS_MODULE);
 337         call_rcu(&head->rcu, fl_destroy_rcu);
 338 }
 339
 340 static void *fl_get(struct tcf_proto *tp, u32 handle)
 341 {
 342         struct cls_fl_head *head = rtnl_dereference(tp->root);
 343
 344         return idr_find_ext(&head->handle_idr, handle);
 345 }
 346
 347 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 348         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 349         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 350         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 351                                             .len = IFNAMSIZ },
 352         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 353         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 354         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 355         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 356         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 357         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 358         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 359         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 360         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 361         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 362         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 363         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 364         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 365         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 366         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 367         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 368         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 369         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 370         [TCA_FLOWER_KEY_VLAN_ID]        = { .type = NLA_U16 },
 371         [TCA_FLOWER_KEY_VLAN_PRIO]      = { .type = NLA_U8 },
 372         [TCA_FLOWER_KEY_VLAN_ETH_TYPE]  = { .type = NLA_U16 },
 373         [TCA_FLOWER_KEY_ENC_KEY_ID]     = { .type = NLA_U32 },
 374         [TCA_FLOWER_KEY_ENC_IPV4_SRC]   = { .type = NLA_U32 },
 375         [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
 376         [TCA_FLOWER_KEY_ENC_IPV4_DST]   = { .type = NLA_U32 },
 377         [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
 378         [TCA_FLOWER_KEY_ENC_IPV6_SRC]   = { .len = sizeof(struct in6_addr) },
 379         [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
 380         [TCA_FLOWER_KEY_ENC_IPV6_DST]   = { .len = sizeof(struct in6_addr) },
 381         [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
 382         [TCA_FLOWER_KEY_TCP_SRC_MASK]   = { .type = NLA_U16 },
 383         [TCA_FLOWER_KEY_TCP_DST_MASK]   = { .type = NLA_U16 },
 384         [TCA_FLOWER_KEY_UDP_SRC_MASK]   = { .type = NLA_U16 },
 385         [TCA_FLOWER_KEY_UDP_DST_MASK]   = { .type = NLA_U16 },
 386         [TCA_FLOWER_KEY_SCTP_SRC_MASK]  = { .type = NLA_U16 },
 387         [TCA_FLOWER_KEY_SCTP_DST_MASK]  = { .type = NLA_U16 },
 388         [TCA_FLOWER_KEY_SCTP_SRC]       = { .type = NLA_U16 },
 389         [TCA_FLOWER_KEY_SCTP_DST]       = { .type = NLA_U16 },
 390         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT]       = { .type = NLA_U16 },
 391         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK]  = { .type = NLA_U16 },
 392         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT]       = { .type = NLA_U16 },
 393         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK]  = { .type = NLA_U16 },
 394         [TCA_FLOWER_KEY_FLAGS]          = { .type = NLA_U32 },
 395         [TCA_FLOWER_KEY_FLAGS_MASK]     = { .type = NLA_U32 },
 396         [TCA_FLOWER_KEY_ICMPV4_TYPE]    = { .type = NLA_U8 },
 397         [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 },
 398         [TCA_FLOWER_KEY_ICMPV4_CODE]    = { .type = NLA_U8 },
 399         [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 },
 400         [TCA_FLOWER_KEY_ICMPV6_TYPE]    = { .type = NLA_U8 },
 401         [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 },
 402         [TCA_FLOWER_KEY_ICMPV6_CODE]    = { .type = NLA_U8 },
 403         [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 },
 404         [TCA_FLOWER_KEY_ARP_SIP]        = { .type = NLA_U32 },
 405         [TCA_FLOWER_KEY_ARP_SIP_MASK]   = { .type = NLA_U32 },
 406         [TCA_FLOWER_KEY_ARP_TIP]        = { .type = NLA_U32 },
 407         [TCA_FLOWER_KEY_ARP_TIP_MASK]   = { .type = NLA_U32 },
 408         [TCA_FLOWER_KEY_ARP_OP]         = { .type = NLA_U8 },
 409         [TCA_FLOWER_KEY_ARP_OP_MASK]    = { .type = NLA_U8 },
 410         [TCA_FLOWER_KEY_ARP_SHA]        = { .len = ETH_ALEN },
 411         [TCA_FLOWER_KEY_ARP_SHA_MASK]   = { .len = ETH_ALEN },
 412         [TCA_FLOWER_KEY_ARP_THA]        = { .len = ETH_ALEN },
 413         [TCA_FLOWER_KEY_ARP_THA_MASK]   = { .len = ETH_ALEN },
 414         [TCA_FLOWER_KEY_MPLS_TTL]       = { .type = NLA_U8 },
 415         [TCA_FLOWER_KEY_MPLS_BOS]       = { .type = NLA_U8 },
 416         [TCA_FLOWER_KEY_MPLS_TC]        = { .type = NLA_U8 },
 417         [TCA_FLOWER_KEY_MPLS_LABEL]     = { .type = NLA_U32 },
 418         [TCA_FLOWER_KEY_TCP_FLAGS]      = { .type = NLA_U16 },
 419         [TCA_FLOWER_KEY_TCP_FLAGS_MASK] = { .type = NLA_U16 },
 420         [TCA_FLOWER_KEY_IP_TOS]         = { .type = NLA_U8 },
 421         [TCA_FLOWER_KEY_IP_TOS_MASK]    = { .type = NLA_U8 },
 422         [TCA_FLOWER_KEY_IP_TTL]         = { .type = NLA_U8 },
 423         [TCA_FLOWER_KEY_IP_TTL_MASK]    = { .type = NLA_U8 },
 424 };
 425
 426 static void fl_set_key_val(struct nlattr **tb,
 427                            void *val, int val_type,
 428                            void *mask, int mask_type, int len)
 429 {
 430         if (!tb[val_type])
 431                 return;
 432         memcpy(val, nla_data(tb[val_type]), len);
 433         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 434                 memset(mask, 0xff, len);
 435         else
 436                 memcpy(mask, nla_data(tb[mask_type]), len);
 437 }
 438
 439 static int fl_set_key_mpls(struct nlattr **tb,
 440                            struct flow_dissector_key_mpls *key_val,
 441                            struct flow_dissector_key_mpls *key_mask)
 442 {
 443         if (tb[TCA_FLOWER_KEY_MPLS_TTL]) {
 444                 key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]);
 445                 key_mask->mpls_ttl = MPLS_TTL_MASK;
 446         }
 447         if (tb[TCA_FLOWER_KEY_MPLS_BOS]) {
 448                 u8 bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]);
 449
 450                 if (bos & ~MPLS_BOS_MASK)
 451                         return -EINVAL;
 452                 key_val->mpls_bos = bos;
 453                 key_mask->mpls_bos = MPLS_BOS_MASK;
 454         }
 455         if (tb[TCA_FLOWER_KEY_MPLS_TC]) {
 456                 u8 tc = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]);
 457
 458                 if (tc & ~MPLS_TC_MASK)
 459                         return -EINVAL;
 460                 key_val->mpls_tc = tc;
 461                 key_mask->mpls_tc = MPLS_TC_MASK;
 462         }
 463         if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) {
 464                 u32 label = nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]);
 465
 466                 if (label & ~MPLS_LABEL_MASK)
 467                         return -EINVAL;
 468                 key_val->mpls_label = label;
 469                 key_mask->mpls_label = MPLS_LABEL_MASK;
 470         }
 471         return 0;
 472 }
 473
 474 static void fl_set_key_vlan(struct nlattr **tb,
 475                             struct flow_dissector_key_vlan *key_val,
 476                             struct flow_dissector_key_vlan *key_mask)
 477 {
 478 #define VLAN_PRIORITY_MASK      0x7
 479
 480         if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
 481                 key_val->vlan_id =
 482                         nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
 483                 key_mask->vlan_id = VLAN_VID_MASK;
 484         }
 485         if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
 486                 key_val->vlan_priority =
 487                         nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
 488                         VLAN_PRIORITY_MASK;
 489                 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
 490         }
 491 }
 492
 493 static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
 494                             u32 *dissector_key, u32 *dissector_mask,
 495                             u32 flower_flag_bit, u32 dissector_flag_bit)
 496 {
 497         if (flower_mask & flower_flag_bit) {
 498                 *dissector_mask |= dissector_flag_bit;
 499                 if (flower_key & flower_flag_bit)
 500                         *dissector_key |= dissector_flag_bit;
 501         }
 502 }
 503
 504 static int fl_set_key_flags(struct nlattr **tb,
 505                             u32 *flags_key, u32 *flags_mask)
 506 {
 507         u32 key, mask;
 508
 509         /* mask is mandatory for flags */
 510         if (!tb[TCA_FLOWER_KEY_FLAGS_MASK])
 511                 return -EINVAL;
 512
 513         key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS]));
 514         mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
 515
 516         *flags_key  = 0;
 517         *flags_mask = 0;
 518
 519         fl_set_key_flag(key, mask, flags_key, flags_mask,
 520                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
 521
 522         return 0;
 523 }
 524
 525 static void fl_set_key_ip(struct nlattr **tb,
 526                           struct flow_dissector_key_ip *key,
 527                           struct flow_dissector_key_ip *mask)
 528 {
 529                 fl_set_key_val(tb, &key->tos, TCA_FLOWER_KEY_IP_TOS,
 530                                &mask->tos, TCA_FLOWER_KEY_IP_TOS_MASK,
 531                                sizeof(key->tos));
 532
 533                 fl_set_key_val(tb, &key->ttl, TCA_FLOWER_KEY_IP_TTL,
 534                                &mask->ttl, TCA_FLOWER_KEY_IP_TTL_MASK,
 535                                sizeof(key->ttl));
 536 }
 537
 538 static int fl_set_key(struct net *net, struct nlattr **tb,
 539                       struct fl_flow_key *key, struct fl_flow_key *mask)
 540 {
 541         __be16 ethertype;
 542         int ret = 0;
 543 #ifdef CONFIG_NET_CLS_IND
 544         if (tb[TCA_FLOWER_INDEV]) {
 545                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
 546                 if (err < 0)
 547                         return err;
 548                 key->indev_ifindex = err;
 549                 mask->indev_ifindex = 0xffffffff;
 550         }
 551 #endif
 552
 553         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 554                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 555                        sizeof(key->eth.dst));
 556         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 557                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 558                        sizeof(key->eth.src));
 559
 560         if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
 561                 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
 562
 563                 if (ethertype == htons(ETH_P_8021Q)) {
 564                         fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
 565                         fl_set_key_val(tb, &key->basic.n_proto,
 566                                        TCA_FLOWER_KEY_VLAN_ETH_TYPE,
 567                                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 568                                        sizeof(key->basic.n_proto));
 569                 } else {
 570                         key->basic.n_proto = ethertype;
 571                         mask->basic.n_proto = cpu_to_be16(~0);
 572                 }
 573         }
 574
 575         if (key->basic.n_proto == htons(ETH_P_IP) ||
 576             key->basic.n_proto == htons(ETH_P_IPV6)) {
 577                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 578                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 579                                sizeof(key->basic.ip_proto));
 580                 fl_set_key_ip(tb, &key->ip, &mask->ip);
 581         }
 582
 583         if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
 584                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 585                 mask->control.addr_type = ~0;
 586                 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
 587                                &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
 588                                sizeof(key->ipv4.src));
 589                 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
 590                                &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
 591                                sizeof(key->ipv4.dst));
 592         } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
 593                 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 594                 mask->control.addr_type = ~0;
 595                 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
 596                                &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
 597                                sizeof(key->ipv6.src));
 598                 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
 599                                &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
 600                                sizeof(key->ipv6.dst));
 601         }
 602
 603         if (key->basic.ip_proto == IPPROTO_TCP) {
 604                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
 605                                &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
 606                                sizeof(key->tp.src));
 607                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 608                                &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 609                                sizeof(key->tp.dst));
 610                 fl_set_key_val(tb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
 611                                &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
 612                                sizeof(key->tcp.flags));
 613         } else if (key->basic.ip_proto == IPPROTO_UDP) {
 614                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 615                                &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
 616                                sizeof(key->tp.src));
 617                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
 618                                &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
 619                                sizeof(key->tp.dst));
 620         } else if (key->basic.ip_proto == IPPROTO_SCTP) {
 621                 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
 622                                &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
 623                                sizeof(key->tp.src));
 624                 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
 625                                &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
 626                                sizeof(key->tp.dst));
 627         } else if (key->basic.n_proto == htons(ETH_P_IP) &&
 628                    key->basic.ip_proto == IPPROTO_ICMP) {
 629                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV4_TYPE,
 630                                &mask->icmp.type,
 631                                TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
 632                                sizeof(key->icmp.type));
 633                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE,
 634                                &mask->icmp.code,
 635                                TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
 636                                sizeof(key->icmp.code));
 637         } else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
 638                    key->basic.ip_proto == IPPROTO_ICMPV6) {
 639                 fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV6_TYPE,
 640                                &mask->icmp.type,
 641                                TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
 642                                sizeof(key->icmp.type));
 643                 fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV6_CODE,
 644                                &mask->icmp.code,
 645                                TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
 646                                sizeof(key->icmp.code));
 647         } else if (key->basic.n_proto == htons(ETH_P_MPLS_UC) ||
 648                    key->basic.n_proto == htons(ETH_P_MPLS_MC)) {
 649                 ret = fl_set_key_mpls(tb, &key->mpls, &mask->mpls);
 650                 if (ret)
 651                         return ret;
 652         } else if (key->basic.n_proto == htons(ETH_P_ARP) ||
 653                    key->basic.n_proto == htons(ETH_P_RARP)) {
 654                 fl_set_key_val(tb, &key->arp.sip, TCA_FLOWER_KEY_ARP_SIP,
 655                                &mask->arp.sip, TCA_FLOWER_KEY_ARP_SIP_MASK,
 656                                sizeof(key->arp.sip));
 657                 fl_set_key_val(tb, &key->arp.tip, TCA_FLOWER_KEY_ARP_TIP,
 658                                &mask->arp.tip, TCA_FLOWER_KEY_ARP_TIP_MASK,
 659                                sizeof(key->arp.tip));
 660                 fl_set_key_val(tb, &key->arp.op, TCA_FLOWER_KEY_ARP_OP,
 661                                &mask->arp.op, TCA_FLOWER_KEY_ARP_OP_MASK,
 662                                sizeof(key->arp.op));
 663                 fl_set_key_val(tb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
 664                                mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
 665                                sizeof(key->arp.sha));
 666                 fl_set_key_val(tb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
 667                                mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
 668                                sizeof(key->arp.tha));
 669         }
 670
 671         if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
 672             tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
 673                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 674                 mask->enc_control.addr_type = ~0;
 675                 fl_set_key_val(tb, &key->enc_ipv4.src,
 676                                TCA_FLOWER_KEY_ENC_IPV4_SRC,
 677                                &mask->enc_ipv4.src,
 678                                TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
 679                                sizeof(key->enc_ipv4.src));
 680                 fl_set_key_val(tb, &key->enc_ipv4.dst,
 681                                TCA_FLOWER_KEY_ENC_IPV4_DST,
 682                                &mask->enc_ipv4.dst,
 683                                TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
 684                                sizeof(key->enc_ipv4.dst));
 685         }
 686
 687         if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] ||
 688             tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) {
 689                 key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 690                 mask->enc_control.addr_type = ~0;
 691                 fl_set_key_val(tb, &key->enc_ipv6.src,
 692                                TCA_FLOWER_KEY_ENC_IPV6_SRC,
 693                                &mask->enc_ipv6.src,
 694                                TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
 695                                sizeof(key->enc_ipv6.src));
 696                 fl_set_key_val(tb, &key->enc_ipv6.dst,
 697                                TCA_FLOWER_KEY_ENC_IPV6_DST,
 698                                &mask->enc_ipv6.dst,
 699                                TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
 700                                sizeof(key->enc_ipv6.dst));
 701         }
 702
 703         fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID,
 704                        &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC,
 705                        sizeof(key->enc_key_id.keyid));
 706
 707         fl_set_key_val(tb, &key->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
 708                        &mask->enc_tp.src, TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
 709                        sizeof(key->enc_tp.src));
 710
 711         fl_set_key_val(tb, &key->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
 712                        &mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
 713                        sizeof(key->enc_tp.dst));
 714
 715         if (tb[TCA_FLOWER_KEY_FLAGS])
 716                 ret = fl_set_key_flags(tb, &key->control.flags, &mask->control.flags);
 717
 718         return ret;
 719 }
 720
 721 static bool fl_mask_eq(struct fl_flow_mask *mask1,
 722                        struct fl_flow_mask *mask2)
 723 {
 724         const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
 725         const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
 726
 727         return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
 728                !memcmp(lmask1, lmask2, fl_mask_range(mask1));
 729 }
 730
 731 static const struct rhashtable_params fl_ht_params = {
 732         .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
 733         .head_offset = offsetof(struct cls_fl_filter, ht_node),
 734         .automatic_shrinking = true,
 735 };
 736
 737 static int fl_init_hashtable(struct cls_fl_head *head,
 738                              struct fl_flow_mask *mask)
 739 {
 740         head->ht_params = fl_ht_params;
 741         head->ht_params.key_len = fl_mask_range(mask);
 742         head->ht_params.key_offset += mask->range.start;
 743
 744         return rhashtable_init(&head->ht, &head->ht_params);
 745 }
 746
 747 #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
 748 #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
 749
 750 #define FL_KEY_IS_MASKED(mask, member)                                          \
 751         memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),               \
 752                    0, FL_KEY_MEMBER_SIZE(member))                               \
 753
 754 #define FL_KEY_SET(keys, cnt, id, member)                                       \
 755         do {                                                                    \
 756                 keys[cnt].key_id = id;                                          \
 757                 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);                \
 758                 cnt++;                                                          \
 759         } while(0);
 760
 761 #define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)                       \
 762         do {                                                                    \
 763                 if (FL_KEY_IS_MASKED(mask, member))                             \
 764                         FL_KEY_SET(keys, cnt, id, member);                      \
 765         } while(0);
 766
 767 static void fl_init_dissector(struct cls_fl_head *head,
 768                               struct fl_flow_mask *mask)
 769 {
 770         struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
 771         size_t cnt = 0;
 772
 773         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
 774         FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
 775         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 776                              FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
 777         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 778                              FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
 779         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 780                              FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
 781         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 782                              FLOW_DISSECTOR_KEY_PORTS, tp);
 783         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 784                              FLOW_DISSECTOR_KEY_IP, ip);
 785         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 786                              FLOW_DISSECTOR_KEY_TCP, tcp);
 787         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 788                              FLOW_DISSECTOR_KEY_ICMP, icmp);
 789         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 790                              FLOW_DISSECTOR_KEY_ARP, arp);
 791         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 792                              FLOW_DISSECTOR_KEY_MPLS, mpls);
 793         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 794                              FLOW_DISSECTOR_KEY_VLAN, vlan);
 795         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 796                              FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
 797         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 798                              FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
 799         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 800                              FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
 801         if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) ||
 802             FL_KEY_IS_MASKED(&mask->key, enc_ipv6))
 803                 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL,
 804                            enc_control);
 805         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 806                              FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
 807
 808         skb_flow_dissector_init(&head->dissector, keys, cnt);
 809 }
 810
 811 static int fl_check_assign_mask(struct cls_fl_head *head,
 812                                 struct fl_flow_mask *mask)
 813 {
 814         int err;
 815
 816         if (head->mask_assigned) {
 817                 if (!fl_mask_eq(&head->mask, mask))
 818                         return -EINVAL;
 819                 else
 820                         return 0;
 821         }
 822
 823         /* Mask is not assigned yet. So assign it and init hashtable
 824          * according to that.
 825          */
 826         err = fl_init_hashtable(head, mask);
 827         if (err)
 828                 return err;
 829         memcpy(&head->mask, mask, sizeof(head->mask));
 830         head->mask_assigned = true;
 831
 832         fl_init_dissector(head, mask);
 833
 834         return 0;
 835 }
 836
 837 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 838                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 839                         unsigned long base, struct nlattr **tb,
 840                         struct nlattr *est, bool ovr)
 841 {
 842         int err;
 843
 844         err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
 845         if (err < 0)
 846                 return err;
 847
 848         if (tb[TCA_FLOWER_CLASSID]) {
 849                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 850                 tcf_bind_filter(tp, &f->res, base);
 851         }
 852
 853         err = fl_set_key(net, tb, &f->key, &mask->key);
 854         if (err)
 855                 return err;
 856
 857         fl_mask_update_range(mask);
 858         fl_set_masked_key(&f->mkey, &f->key, mask);
 859
 860         return 0;
 861 }
 862
 863 static int fl_change(struct net *net, struct sk_buff *in_skb,
 864                      struct tcf_proto *tp, unsigned long base,
 865                      u32 handle, struct nlattr **tca,
 866                      void **arg, bool ovr)
 867 {
 868         struct cls_fl_head *head = rtnl_dereference(tp->root);
 869         struct cls_fl_filter *fold = *arg;
 870         struct cls_fl_filter *fnew;
 871         struct nlattr **tb;
 872         struct fl_flow_mask mask = {};
 873         unsigned long idr_index;
 874         int err;
 875
 876         if (!tca[TCA_OPTIONS])
 877                 return -EINVAL;
 878
 879         tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
 880         if (!tb)
 881                 return -ENOBUFS;
 882
 883         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
 884                                fl_policy, NULL);
 885         if (err < 0)
 886                 goto errout_tb;
 887
 888         if (fold && handle && fold->handle != handle) {
 889                 err = -EINVAL;
 890                 goto errout_tb;
 891         }
 892
 893         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 894         if (!fnew) {
 895                 err = -ENOBUFS;
 896                 goto errout_tb;
 897         }
 898
 899         err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 900         if (err < 0)
 901                 goto errout;
 902
 903         if (!handle) {
 904                 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
 905                                     1, 0x80000000, GFP_KERNEL);
 906                 if (err)
 907                         goto errout;
 908                 fnew->handle = idr_index;
 909         }
 910
 911         /* user specifies a handle and it doesn't exist */
 912         if (handle && !fold) {
 913                 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
 914                                     handle, handle + 1, GFP_KERNEL);
 915                 if (err)
 916                         goto errout;
 917                 fnew->handle = idr_index;
 918         }
 919
 920         if (tb[TCA_FLOWER_FLAGS]) {
 921                 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 922
 923                 if (!tc_flags_valid(fnew->flags)) {
 924                         err = -EINVAL;
 925                         goto errout_idr;
 926                 }
 927         }
 928
 929         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
 930         if (err)
 931                 goto errout_idr;
 932
 933         err = fl_check_assign_mask(head, &mask);
 934         if (err)
 935                 goto errout_idr;
 936
 937         if (!tc_skip_sw(fnew->flags)) {
 938                 if (!fold && fl_lookup(head, &fnew->mkey)) {
 939                         err = -EEXIST;
 940                         goto errout_idr;
 941                 }
 942
 943                 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 944                                              head->ht_params);
 945                 if (err)
 946                         goto errout_idr;
 947         }
 948
 949         if (!tc_skip_hw(fnew->flags)) {
 950                 err = fl_hw_replace_filter(tp,
 951                                            &head->dissector,
 952                                            &mask.key,
 953                                            fnew);
 954                 if (err)
 955                         goto errout_idr;
 956         }
 957
 958         if (!tc_in_hw(fnew->flags))
 959                 fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 960
 961         if (fold) {
 962                 if (!tc_skip_sw(fold->flags))
 963                         rhashtable_remove_fast(&head->ht, &fold->ht_node,
 964                                                head->ht_params);
 965                 if (!tc_skip_hw(fold->flags))
 966                         fl_hw_destroy_filter(tp, fold);
 967         }
 968
 969         *arg = fnew;
 970
 971         if (fold) {
 972                 fnew->handle = handle;
 973                 idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
 974                 list_replace_rcu(&fold->list, &fnew->list);
 975                 tcf_unbind_filter(tp, &fold->res);
 976                 call_rcu(&fold->rcu, fl_destroy_filter);
 977         } else {
 978                 list_add_tail_rcu(&fnew->list, &head->filters);
 979         }
 980
 981         kfree(tb);
 982         return 0;
 983
 984 errout_idr:
 985         if (fnew->handle)
 986                 idr_remove_ext(&head->handle_idr, fnew->handle);
 987 errout:
 988         tcf_exts_destroy(&fnew->exts);
 989         kfree(fnew);
 990 errout_tb:
 991         kfree(tb);
 992         return err;
 993 }
 994
 995 static int fl_delete(struct tcf_proto *tp, void *arg, bool *last)
 996 {
 997         struct cls_fl_head *head = rtnl_dereference(tp->root);
 998         struct cls_fl_filter *f = arg;
 999
1000         if (!tc_skip_sw(f->flags))
1001                 rhashtable_remove_fast(&head->ht, &f->ht_node,
1002                                        head->ht_params);
1003         __fl_delete(tp, f);
1004         *last = list_empty(&head->filters);
1005         return 0;
1006 }
1007
1008 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1009 {
1010         struct cls_fl_head *head = rtnl_dereference(tp->root);
1011         struct cls_fl_filter *f;
1012
1013         list_for_each_entry_rcu(f, &head->filters, list) {
1014                 if (arg->count < arg->skip)
1015                         goto skip;
1016                 if (arg->fn(tp, f, arg) < 0) {
1017                         arg->stop = 1;
1018                         break;
1019                 }
1020 skip:
1021                 arg->count++;
1022         }
1023 }
1024
1025 static int fl_dump_key_val(struct sk_buff *skb,
1026                            void *val, int val_type,
1027                            void *mask, int mask_type, int len)
1028 {
1029         int err;
1030
1031         if (!memchr_inv(mask, 0, len))
1032                 return 0;
1033         err = nla_put(skb, val_type, len, val);
1034         if (err)
1035                 return err;
1036         if (mask_type != TCA_FLOWER_UNSPEC) {
1037                 err = nla_put(skb, mask_type, len, mask);
1038                 if (err)
1039                         return err;
1040         }
1041         return 0;
1042 }
1043
1044 static int fl_dump_key_mpls(struct sk_buff *skb,
1045                             struct flow_dissector_key_mpls *mpls_key,
1046                             struct flow_dissector_key_mpls *mpls_mask)
1047 {
1048         int err;
1049
1050         if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask)))
1051                 return 0;
1052         if (mpls_mask->mpls_ttl) {
1053                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL,
1054                                  mpls_key->mpls_ttl);
1055                 if (err)
1056                         return err;
1057         }
1058         if (mpls_mask->mpls_tc) {
1059                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC,
1060                                  mpls_key->mpls_tc);
1061                 if (err)
1062                         return err;
1063         }
1064         if (mpls_mask->mpls_label) {
1065                 err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL,
1066                                   mpls_key->mpls_label);
1067                 if (err)
1068                         return err;
1069         }
1070         if (mpls_mask->mpls_bos) {
1071                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS,
1072                                  mpls_key->mpls_bos);
1073                 if (err)
1074                         return err;
1075         }
1076         return 0;
1077 }
1078
1079 static int fl_dump_key_ip(struct sk_buff *skb,
1080                           struct flow_dissector_key_ip *key,
1081                           struct flow_dissector_key_ip *mask)
1082 {
1083         if (fl_dump_key_val(skb, &key->tos, TCA_FLOWER_KEY_IP_TOS, &mask->tos,
1084                             TCA_FLOWER_KEY_IP_TOS_MASK, sizeof(key->tos)) ||
1085             fl_dump_key_val(skb, &key->ttl, TCA_FLOWER_KEY_IP_TTL, &mask->ttl,
1086                             TCA_FLOWER_KEY_IP_TTL_MASK, sizeof(key->ttl)))
1087                 return -1;
1088
1089         return 0;
1090 }
1091
1092 static int fl_dump_key_vlan(struct sk_buff *skb,
1093                             struct flow_dissector_key_vlan *vlan_key,
1094                             struct flow_dissector_key_vlan *vlan_mask)
1095 {
1096         int err;
1097
1098         if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
1099                 return 0;
1100         if (vlan_mask->vlan_id) {
1101                 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
1102                                   vlan_key->vlan_id);
1103                 if (err)
1104                         return err;
1105         }
1106         if (vlan_mask->vlan_priority) {
1107                 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
1108                                  vlan_key->vlan_priority);
1109                 if (err)
1110                         return err;
1111         }
1112         return 0;
1113 }
1114
1115 static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
1116                             u32 *flower_key, u32 *flower_mask,
1117                             u32 flower_flag_bit, u32 dissector_flag_bit)
1118 {
1119         if (dissector_mask & dissector_flag_bit) {
1120                 *flower_mask |= flower_flag_bit;
1121                 if (dissector_key & dissector_flag_bit)
1122                         *flower_key |= flower_flag_bit;
1123         }
1124 }
1125
1126 static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
1127 {
1128         u32 key, mask;
1129         __be32 _key, _mask;
1130         int err;
1131
1132         if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
1133                 return 0;
1134
1135         key = 0;
1136         mask = 0;
1137
1138         fl_get_key_flag(flags_key, flags_mask, &key, &mask,
1139                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
1140
1141         _key = cpu_to_be32(key);
1142         _mask = cpu_to_be32(mask);
1143
1144         err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
1145         if (err)
1146                 return err;
1147
1148         return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
1149 }
1150
1151 static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
1152                    struct sk_buff *skb, struct tcmsg *t)
1153 {
1154         struct cls_fl_head *head = rtnl_dereference(tp->root);
1155         struct cls_fl_filter *f = fh;
1156         struct nlattr *nest;
1157         struct fl_flow_key *key, *mask;
1158
1159         if (!f)
1160                 return skb->len;
1161
1162         t->tcm_handle = f->handle;
1163
1164         nest = nla_nest_start(skb, TCA_OPTIONS);
1165         if (!nest)
1166                 goto nla_put_failure;
1167
1168         if (f->res.classid &&
1169             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
1170                 goto nla_put_failure;
1171
1172         key = &f->key;
1173         mask = &head->mask.key;
1174
1175         if (mask->indev_ifindex) {
1176                 struct net_device *dev;
1177
1178                 dev = __dev_get_by_index(net, key->indev_ifindex);
1179                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
1180                         goto nla_put_failure;
1181         }
1182
1183         if (!tc_skip_hw(f->flags))
1184                 fl_hw_update_stats(tp, f);
1185
1186         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
1187                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
1188                             sizeof(key->eth.dst)) ||
1189             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
1190                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
1191                             sizeof(key->eth.src)) ||
1192             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
1193                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
1194                             sizeof(key->basic.n_proto)))
1195                 goto nla_put_failure;
1196
1197         if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls))
1198                 goto nla_put_failure;
1199
1200         if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
1201                 goto nla_put_failure;
1202
1203         if ((key->basic.n_proto == htons(ETH_P_IP) ||
1204              key->basic.n_proto == htons(ETH_P_IPV6)) &&
1205             (fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
1206                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
1207                             sizeof(key->basic.ip_proto)) ||
1208             fl_dump_key_ip(skb, &key->ip, &mask->ip)))
1209                 goto nla_put_failure;
1210
1211         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1212             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
1213                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
1214                              sizeof(key->ipv4.src)) ||
1215              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
1216                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
1217                              sizeof(key->ipv4.dst))))
1218                 goto nla_put_failure;
1219         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1220                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
1221                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
1222                                   sizeof(key->ipv6.src)) ||
1223                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
1224                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
1225                                   sizeof(key->ipv6.dst))))
1226                 goto nla_put_failure;
1227
1228         if (key->basic.ip_proto == IPPROTO_TCP &&
1229             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
1230                              &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
1231                              sizeof(key->tp.src)) ||
1232              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
1233                              &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
1234                              sizeof(key->tp.dst)) ||
1235              fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
1236                              &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
1237                              sizeof(key->tcp.flags))))
1238                 goto nla_put_failure;
1239         else if (key->basic.ip_proto == IPPROTO_UDP &&
1240                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
1241                                   &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
1242                                   sizeof(key->tp.src)) ||
1243                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
1244                                   &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
1245                                   sizeof(key->tp.dst))))
1246                 goto nla_put_failure;
1247         else if (key->basic.ip_proto == IPPROTO_SCTP &&
1248                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
1249                                   &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
1250                                   sizeof(key->tp.src)) ||
1251                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
1252                                   &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
1253                                   sizeof(key->tp.dst))))
1254                 goto nla_put_failure;
1255         else if (key->basic.n_proto == htons(ETH_P_IP) &&
1256                  key->basic.ip_proto == IPPROTO_ICMP &&
1257                  (fl_dump_key_val(skb, &key->icmp.type,
1258                                   TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type,
1259                                   TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
1260                                   sizeof(key->icmp.type)) ||
1261                   fl_dump_key_val(skb, &key->icmp.code,
1262                                   TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code,
1263                                   TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
1264                                   sizeof(key->icmp.code))))
1265                 goto nla_put_failure;
1266         else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
1267                  key->basic.ip_proto == IPPROTO_ICMPV6 &&
1268                  (fl_dump_key_val(skb, &key->icmp.type,
1269                                   TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type,
1270                                   TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
1271                                   sizeof(key->icmp.type)) ||
1272                   fl_dump_key_val(skb, &key->icmp.code,
1273                                   TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code,
1274                                   TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
1275                                   sizeof(key->icmp.code))))
1276                 goto nla_put_failure;
1277         else if ((key->basic.n_proto == htons(ETH_P_ARP) ||
1278                   key->basic.n_proto == htons(ETH_P_RARP)) &&
1279                  (fl_dump_key_val(skb, &key->arp.sip,
1280                                   TCA_FLOWER_KEY_ARP_SIP, &mask->arp.sip,
1281                                   TCA_FLOWER_KEY_ARP_SIP_MASK,
1282                                   sizeof(key->arp.sip)) ||
1283                   fl_dump_key_val(skb, &key->arp.tip,
1284                                   TCA_FLOWER_KEY_ARP_TIP, &mask->arp.tip,
1285                                   TCA_FLOWER_KEY_ARP_TIP_MASK,
1286                                   sizeof(key->arp.tip)) ||
1287                   fl_dump_key_val(skb, &key->arp.op,
1288                                   TCA_FLOWER_KEY_ARP_OP, &mask->arp.op,
1289                                   TCA_FLOWER_KEY_ARP_OP_MASK,
1290                                   sizeof(key->arp.op)) ||
1291                   fl_dump_key_val(skb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
1292                                   mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
1293                                   sizeof(key->arp.sha)) ||
1294                   fl_dump_key_val(skb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
1295                                   mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
1296                                   sizeof(key->arp.tha))))
1297                 goto nla_put_failure;
1298
1299         if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1300             (fl_dump_key_val(skb, &key->enc_ipv4.src,
1301                             TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
1302                             TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
1303                             sizeof(key->enc_ipv4.src)) ||
1304              fl_dump_key_val(skb, &key->enc_ipv4.dst,
1305                              TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
1306                              TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
1307                              sizeof(key->enc_ipv4.dst))))
1308                 goto nla_put_failure;
1309         else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1310                  (fl_dump_key_val(skb, &key->enc_ipv6.src,
1311                             TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
1312                             TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
1313                             sizeof(key->enc_ipv6.src)) ||
1314                  fl_dump_key_val(skb, &key->enc_ipv6.dst,
1315                                  TCA_FLOWER_KEY_ENC_IPV6_DST,
1316                                  &mask->enc_ipv6.dst,
1317                                  TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
1318                             sizeof(key->enc_ipv6.dst))))
1319                 goto nla_put_failure;
1320
1321         if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
1322                             &mask->enc_key_id, TCA_FLOWER_UNSPEC,
1323                             sizeof(key->enc_key_id)) ||
1324             fl_dump_key_val(skb, &key->enc_tp.src,
1325                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
1326                             &mask->enc_tp.src,
1327                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
1328                             sizeof(key->enc_tp.src)) ||
1329             fl_dump_key_val(skb, &key->enc_tp.dst,
1330                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
1331                             &mask->enc_tp.dst,
1332                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
1333                             sizeof(key->enc_tp.dst)))
1334                 goto nla_put_failure;
1335
1336         if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
1337                 goto nla_put_failure;
1338
1339         if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
1340                 goto nla_put_failure;
1341
1342         if (tcf_exts_dump(skb, &f->exts))
1343                 goto nla_put_failure;
1344
1345         nla_nest_end(skb, nest);
1346
1347         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
1348                 goto nla_put_failure;
1349
1350         return skb->len;
1351
1352 nla_put_failure:
1353         nla_nest_cancel(skb, nest);
1354         return -1;
1355 }
1356
1357 static void fl_bind_class(void *fh, u32 classid, unsigned long cl)
1358 {
1359         struct cls_fl_filter *f = fh;
1360
1361         if (f && f->res.classid == classid)
1362                 f->res.class = cl;
1363 }
1364
1365 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
1366         .kind           = "flower",
1367         .classify       = fl_classify,
1368         .init           = fl_init,
1369         .destroy        = fl_destroy,
1370         .get            = fl_get,
1371         .change         = fl_change,
1372         .delete         = fl_delete,
1373         .walk           = fl_walk,
1374         .dump           = fl_dump,
1375         .bind_class     = fl_bind_class,
1376         .owner          = THIS_MODULE,
1377 };
1378
1379 static int __init cls_fl_init(void)
1380 {
1381         return register_tcf_proto_ops(&cls_fl_ops);
1382 }
1383
1384 static void __exit cls_fl_exit(void)
1385 {
1386         unregister_tcf_proto_ops(&cls_fl_ops);
1387 }
1388
1389 module_init(cls_fl_init);
1390 module_exit(cls_fl_exit);
1391
1392 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
1393 MODULE_DESCRIPTION("Flower classifier");
1394 MODULE_LICENSE("GPL v2");