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 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  54
  55 struct fl_flow_mask_range {
  56         unsigned short int start;
  57         unsigned short int end;
  58 };
  59
  60 struct fl_flow_mask {
  61         struct fl_flow_key key;
  62         struct fl_flow_mask_range range;
  63         struct rcu_head rcu;
  64 };
  65
  66 struct cls_fl_head {
  67         struct rhashtable ht;
  68         struct fl_flow_mask mask;
  69         struct flow_dissector dissector;
  70         u32 hgen;
  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 };
  79
  80 struct cls_fl_filter {
  81         struct rhash_head ht_node;
  82         struct fl_flow_key mkey;
  83         struct tcf_exts exts;
  84         struct tcf_result res;
  85         struct fl_flow_key key;
  86         struct list_head list;
  87         u32 handle;
  88         u32 flags;
  89         struct rcu_head rcu;
  90         struct tc_to_netdev tc;
  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
 214         return 0;
 215 }
 216
 217 static void fl_destroy_filter(struct rcu_head *head)
 218 {
 219         struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
 220
 221         tcf_exts_destroy(&f->exts);
 222         kfree(f);
 223 }
 224
 225 static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f)
 226 {
 227         struct tc_cls_flower_offload offload = {0};
 228         struct net_device *dev = f->hw_dev;
 229         struct tc_to_netdev *tc = &f->tc;
 230
 231         if (!tc_can_offload(dev, tp))
 232                 return;
 233
 234         offload.command = TC_CLSFLOWER_DESTROY;
 235         offload.prio = tp->prio;
 236         offload.cookie = (unsigned long)f;
 237
 238         tc->type = TC_SETUP_CLSFLOWER;
 239         tc->cls_flower = &offload;
 240
 241         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, tc);
 242 }
 243
 244 static int fl_hw_replace_filter(struct tcf_proto *tp,
 245                                 struct flow_dissector *dissector,
 246                                 struct fl_flow_key *mask,
 247                                 struct cls_fl_filter *f)
 248 {
 249         struct net_device *dev = tp->q->dev_queue->dev;
 250         struct tc_cls_flower_offload offload = {0};
 251         struct tc_to_netdev *tc = &f->tc;
 252         int err;
 253
 254         if (!tc_can_offload(dev, tp)) {
 255                 if (tcf_exts_get_dev(dev, &f->exts, &f->hw_dev) ||
 256                     (f->hw_dev && !tc_can_offload(f->hw_dev, tp))) {
 257                         f->hw_dev = dev;
 258                         return tc_skip_sw(f->flags) ? -EINVAL : 0;
 259                 }
 260                 dev = f->hw_dev;
 261                 tc->egress_dev = true;
 262         } else {
 263                 f->hw_dev = dev;
 264         }
 265
 266         offload.command = TC_CLSFLOWER_REPLACE;
 267         offload.prio = tp->prio;
 268         offload.cookie = (unsigned long)f;
 269         offload.dissector = dissector;
 270         offload.mask = mask;
 271         offload.key = &f->mkey;
 272         offload.exts = &f->exts;
 273
 274         tc->type = TC_SETUP_CLSFLOWER;
 275         tc->cls_flower = &offload;
 276
 277         err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
 278                                             tc);
 279         if (!err)
 280                 f->flags |= TCA_CLS_FLAGS_IN_HW;
 281
 282         if (tc_skip_sw(f->flags))
 283                 return err;
 284         return 0;
 285 }
 286
 287 static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 288 {
 289         struct tc_cls_flower_offload offload = {0};
 290         struct net_device *dev = f->hw_dev;
 291         struct tc_to_netdev *tc = &f->tc;
 292
 293         if (!tc_can_offload(dev, tp))
 294                 return;
 295
 296         offload.command = TC_CLSFLOWER_STATS;
 297         offload.prio = tp->prio;
 298         offload.cookie = (unsigned long)f;
 299         offload.exts = &f->exts;
 300
 301         tc->type = TC_SETUP_CLSFLOWER;
 302         tc->cls_flower = &offload;
 303
 304         dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, tc);
 305 }
 306
 307 static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
 308 {
 309         list_del_rcu(&f->list);
 310         if (!tc_skip_hw(f->flags))
 311                 fl_hw_destroy_filter(tp, f);
 312         tcf_unbind_filter(tp, &f->res);
 313         call_rcu(&f->rcu, fl_destroy_filter);
 314 }
 315
 316 static void fl_destroy_sleepable(struct work_struct *work)
 317 {
 318         struct cls_fl_head *head = container_of(work, struct cls_fl_head,
 319                                                 work);
 320         if (head->mask_assigned)
 321                 rhashtable_destroy(&head->ht);
 322         kfree(head);
 323         module_put(THIS_MODULE);
 324 }
 325
 326 static void fl_destroy_rcu(struct rcu_head *rcu)
 327 {
 328         struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
 329
 330         INIT_WORK(&head->work, fl_destroy_sleepable);
 331         schedule_work(&head->work);
 332 }
 333
 334 static void fl_destroy(struct tcf_proto *tp)
 335 {
 336         struct cls_fl_head *head = rtnl_dereference(tp->root);
 337         struct cls_fl_filter *f, *next;
 338
 339         list_for_each_entry_safe(f, next, &head->filters, list)
 340                 __fl_delete(tp, f);
 341
 342         __module_get(THIS_MODULE);
 343         call_rcu(&head->rcu, fl_destroy_rcu);
 344 }
 345
 346 static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
 347 {
 348         struct cls_fl_head *head = rtnl_dereference(tp->root);
 349         struct cls_fl_filter *f;
 350
 351         list_for_each_entry(f, &head->filters, list)
 352                 if (f->handle == handle)
 353                         return (unsigned long) f;
 354         return 0;
 355 }
 356
 357 static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 358         [TCA_FLOWER_UNSPEC]             = { .type = NLA_UNSPEC },
 359         [TCA_FLOWER_CLASSID]            = { .type = NLA_U32 },
 360         [TCA_FLOWER_INDEV]              = { .type = NLA_STRING,
 361                                             .len = IFNAMSIZ },
 362         [TCA_FLOWER_KEY_ETH_DST]        = { .len = ETH_ALEN },
 363         [TCA_FLOWER_KEY_ETH_DST_MASK]   = { .len = ETH_ALEN },
 364         [TCA_FLOWER_KEY_ETH_SRC]        = { .len = ETH_ALEN },
 365         [TCA_FLOWER_KEY_ETH_SRC_MASK]   = { .len = ETH_ALEN },
 366         [TCA_FLOWER_KEY_ETH_TYPE]       = { .type = NLA_U16 },
 367         [TCA_FLOWER_KEY_IP_PROTO]       = { .type = NLA_U8 },
 368         [TCA_FLOWER_KEY_IPV4_SRC]       = { .type = NLA_U32 },
 369         [TCA_FLOWER_KEY_IPV4_SRC_MASK]  = { .type = NLA_U32 },
 370         [TCA_FLOWER_KEY_IPV4_DST]       = { .type = NLA_U32 },
 371         [TCA_FLOWER_KEY_IPV4_DST_MASK]  = { .type = NLA_U32 },
 372         [TCA_FLOWER_KEY_IPV6_SRC]       = { .len = sizeof(struct in6_addr) },
 373         [TCA_FLOWER_KEY_IPV6_SRC_MASK]  = { .len = sizeof(struct in6_addr) },
 374         [TCA_FLOWER_KEY_IPV6_DST]       = { .len = sizeof(struct in6_addr) },
 375         [TCA_FLOWER_KEY_IPV6_DST_MASK]  = { .len = sizeof(struct in6_addr) },
 376         [TCA_FLOWER_KEY_TCP_SRC]        = { .type = NLA_U16 },
 377         [TCA_FLOWER_KEY_TCP_DST]        = { .type = NLA_U16 },
 378         [TCA_FLOWER_KEY_UDP_SRC]        = { .type = NLA_U16 },
 379         [TCA_FLOWER_KEY_UDP_DST]        = { .type = NLA_U16 },
 380         [TCA_FLOWER_KEY_VLAN_ID]        = { .type = NLA_U16 },
 381         [TCA_FLOWER_KEY_VLAN_PRIO]      = { .type = NLA_U8 },
 382         [TCA_FLOWER_KEY_VLAN_ETH_TYPE]  = { .type = NLA_U16 },
 383         [TCA_FLOWER_KEY_ENC_KEY_ID]     = { .type = NLA_U32 },
 384         [TCA_FLOWER_KEY_ENC_IPV4_SRC]   = { .type = NLA_U32 },
 385         [TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
 386         [TCA_FLOWER_KEY_ENC_IPV4_DST]   = { .type = NLA_U32 },
 387         [TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
 388         [TCA_FLOWER_KEY_ENC_IPV6_SRC]   = { .len = sizeof(struct in6_addr) },
 389         [TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
 390         [TCA_FLOWER_KEY_ENC_IPV6_DST]   = { .len = sizeof(struct in6_addr) },
 391         [TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
 392         [TCA_FLOWER_KEY_TCP_SRC_MASK]   = { .type = NLA_U16 },
 393         [TCA_FLOWER_KEY_TCP_DST_MASK]   = { .type = NLA_U16 },
 394         [TCA_FLOWER_KEY_UDP_SRC_MASK]   = { .type = NLA_U16 },
 395         [TCA_FLOWER_KEY_UDP_DST_MASK]   = { .type = NLA_U16 },
 396         [TCA_FLOWER_KEY_SCTP_SRC_MASK]  = { .type = NLA_U16 },
 397         [TCA_FLOWER_KEY_SCTP_DST_MASK]  = { .type = NLA_U16 },
 398         [TCA_FLOWER_KEY_SCTP_SRC]       = { .type = NLA_U16 },
 399         [TCA_FLOWER_KEY_SCTP_DST]       = { .type = NLA_U16 },
 400         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT]       = { .type = NLA_U16 },
 401         [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK]  = { .type = NLA_U16 },
 402         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT]       = { .type = NLA_U16 },
 403         [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK]  = { .type = NLA_U16 },
 404         [TCA_FLOWER_KEY_FLAGS]          = { .type = NLA_U32 },
 405         [TCA_FLOWER_KEY_FLAGS_MASK]     = { .type = NLA_U32 },
 406         [TCA_FLOWER_KEY_ICMPV4_TYPE]    = { .type = NLA_U8 },
 407         [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 },
 408         [TCA_FLOWER_KEY_ICMPV4_CODE]    = { .type = NLA_U8 },
 409         [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 },
 410         [TCA_FLOWER_KEY_ICMPV6_TYPE]    = { .type = NLA_U8 },
 411         [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 },
 412         [TCA_FLOWER_KEY_ICMPV6_CODE]    = { .type = NLA_U8 },
 413         [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 },
 414         [TCA_FLOWER_KEY_ARP_SIP]        = { .type = NLA_U32 },
 415         [TCA_FLOWER_KEY_ARP_SIP_MASK]   = { .type = NLA_U32 },
 416         [TCA_FLOWER_KEY_ARP_TIP]        = { .type = NLA_U32 },
 417         [TCA_FLOWER_KEY_ARP_TIP_MASK]   = { .type = NLA_U32 },
 418         [TCA_FLOWER_KEY_ARP_OP]         = { .type = NLA_U8 },
 419         [TCA_FLOWER_KEY_ARP_OP_MASK]    = { .type = NLA_U8 },
 420         [TCA_FLOWER_KEY_ARP_SHA]        = { .len = ETH_ALEN },
 421         [TCA_FLOWER_KEY_ARP_SHA_MASK]   = { .len = ETH_ALEN },
 422         [TCA_FLOWER_KEY_ARP_THA]        = { .len = ETH_ALEN },
 423         [TCA_FLOWER_KEY_ARP_THA_MASK]   = { .len = ETH_ALEN },
 424         [TCA_FLOWER_KEY_MPLS_TTL]       = { .type = NLA_U8 },
 425         [TCA_FLOWER_KEY_MPLS_BOS]       = { .type = NLA_U8 },
 426         [TCA_FLOWER_KEY_MPLS_TC]        = { .type = NLA_U8 },
 427         [TCA_FLOWER_KEY_MPLS_LABEL]     = { .type = NLA_U32 },
 428         [TCA_FLOWER_KEY_TCP_FLAGS]      = { .type = NLA_U16 },
 429         [TCA_FLOWER_KEY_TCP_FLAGS_MASK] = { .type = NLA_U16 },
 430 };
 431
 432 static void fl_set_key_val(struct nlattr **tb,
 433                            void *val, int val_type,
 434                            void *mask, int mask_type, int len)
 435 {
 436         if (!tb[val_type])
 437                 return;
 438         memcpy(val, nla_data(tb[val_type]), len);
 439         if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
 440                 memset(mask, 0xff, len);
 441         else
 442                 memcpy(mask, nla_data(tb[mask_type]), len);
 443 }
 444
 445 static int fl_set_key_mpls(struct nlattr **tb,
 446                            struct flow_dissector_key_mpls *key_val,
 447                            struct flow_dissector_key_mpls *key_mask)
 448 {
 449         if (tb[TCA_FLOWER_KEY_MPLS_TTL]) {
 450                 key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]);
 451                 key_mask->mpls_ttl = MPLS_TTL_MASK;
 452         }
 453         if (tb[TCA_FLOWER_KEY_MPLS_BOS]) {
 454                 u8 bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]);
 455
 456                 if (bos & ~MPLS_BOS_MASK)
 457                         return -EINVAL;
 458                 key_val->mpls_bos = bos;
 459                 key_mask->mpls_bos = MPLS_BOS_MASK;
 460         }
 461         if (tb[TCA_FLOWER_KEY_MPLS_TC]) {
 462                 u8 tc = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]);
 463
 464                 if (tc & ~MPLS_TC_MASK)
 465                         return -EINVAL;
 466                 key_val->mpls_tc = tc;
 467                 key_mask->mpls_tc = MPLS_TC_MASK;
 468         }
 469         if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) {
 470                 u32 label = nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]);
 471
 472                 if (label & ~MPLS_LABEL_MASK)
 473                         return -EINVAL;
 474                 key_val->mpls_label = label;
 475                 key_mask->mpls_label = MPLS_LABEL_MASK;
 476         }
 477         return 0;
 478 }
 479
 480 static void fl_set_key_vlan(struct nlattr **tb,
 481                             struct flow_dissector_key_vlan *key_val,
 482                             struct flow_dissector_key_vlan *key_mask)
 483 {
 484 #define VLAN_PRIORITY_MASK      0x7
 485
 486         if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
 487                 key_val->vlan_id =
 488                         nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
 489                 key_mask->vlan_id = VLAN_VID_MASK;
 490         }
 491         if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
 492                 key_val->vlan_priority =
 493                         nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
 494                         VLAN_PRIORITY_MASK;
 495                 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
 496         }
 497 }
 498
 499 static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
 500                             u32 *dissector_key, u32 *dissector_mask,
 501                             u32 flower_flag_bit, u32 dissector_flag_bit)
 502 {
 503         if (flower_mask & flower_flag_bit) {
 504                 *dissector_mask |= dissector_flag_bit;
 505                 if (flower_key & flower_flag_bit)
 506                         *dissector_key |= dissector_flag_bit;
 507         }
 508 }
 509
 510 static int fl_set_key_flags(struct nlattr **tb,
 511                             u32 *flags_key, u32 *flags_mask)
 512 {
 513         u32 key, mask;
 514
 515         /* mask is mandatory for flags */
 516         if (!tb[TCA_FLOWER_KEY_FLAGS_MASK])
 517                 return -EINVAL;
 518
 519         key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS]));
 520         mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
 521
 522         *flags_key  = 0;
 523         *flags_mask = 0;
 524
 525         fl_set_key_flag(key, mask, flags_key, flags_mask,
 526                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
 527
 528         return 0;
 529 }
 530
 531 static int fl_set_key(struct net *net, struct nlattr **tb,
 532                       struct fl_flow_key *key, struct fl_flow_key *mask)
 533 {
 534         __be16 ethertype;
 535         int ret = 0;
 536 #ifdef CONFIG_NET_CLS_IND
 537         if (tb[TCA_FLOWER_INDEV]) {
 538                 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
 539                 if (err < 0)
 540                         return err;
 541                 key->indev_ifindex = err;
 542                 mask->indev_ifindex = 0xffffffff;
 543         }
 544 #endif
 545
 546         fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
 547                        mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
 548                        sizeof(key->eth.dst));
 549         fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
 550                        mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
 551                        sizeof(key->eth.src));
 552
 553         if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
 554                 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
 555
 556                 if (ethertype == htons(ETH_P_8021Q)) {
 557                         fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
 558                         fl_set_key_val(tb, &key->basic.n_proto,
 559                                        TCA_FLOWER_KEY_VLAN_ETH_TYPE,
 560                                        &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
 561                                        sizeof(key->basic.n_proto));
 562                 } else {
 563                         key->basic.n_proto = ethertype;
 564                         mask->basic.n_proto = cpu_to_be16(~0);
 565                 }
 566         }
 567
 568         if (key->basic.n_proto == htons(ETH_P_IP) ||
 569             key->basic.n_proto == htons(ETH_P_IPV6)) {
 570                 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
 571                                &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
 572                                sizeof(key->basic.ip_proto));
 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_TCP, tcp);
 777         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 778                              FLOW_DISSECTOR_KEY_ICMP, icmp);
 779         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 780                              FLOW_DISSECTOR_KEY_ARP, arp);
 781         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 782                              FLOW_DISSECTOR_KEY_MPLS, mpls);
 783         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 784                              FLOW_DISSECTOR_KEY_VLAN, vlan);
 785         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 786                              FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
 787         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 788                              FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
 789         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 790                              FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
 791         if (FL_KEY_IS_MASKED(&mask->key, enc_ipv4) ||
 792             FL_KEY_IS_MASKED(&mask->key, enc_ipv6))
 793                 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL,
 794                            enc_control);
 795         FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 796                              FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
 797
 798         skb_flow_dissector_init(&head->dissector, keys, cnt);
 799 }
 800
 801 static int fl_check_assign_mask(struct cls_fl_head *head,
 802                                 struct fl_flow_mask *mask)
 803 {
 804         int err;
 805
 806         if (head->mask_assigned) {
 807                 if (!fl_mask_eq(&head->mask, mask))
 808                         return -EINVAL;
 809                 else
 810                         return 0;
 811         }
 812
 813         /* Mask is not assigned yet. So assign it and init hashtable
 814          * according to that.
 815          */
 816         err = fl_init_hashtable(head, mask);
 817         if (err)
 818                 return err;
 819         memcpy(&head->mask, mask, sizeof(head->mask));
 820         head->mask_assigned = true;
 821
 822         fl_init_dissector(head, mask);
 823
 824         return 0;
 825 }
 826
 827 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 828                         struct cls_fl_filter *f, struct fl_flow_mask *mask,
 829                         unsigned long base, struct nlattr **tb,
 830                         struct nlattr *est, bool ovr)
 831 {
 832         struct tcf_exts e;
 833         int err;
 834
 835         err = tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
 836         if (err < 0)
 837                 return err;
 838         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 839         if (err < 0)
 840                 goto errout;
 841
 842         if (tb[TCA_FLOWER_CLASSID]) {
 843                 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
 844                 tcf_bind_filter(tp, &f->res, base);
 845         }
 846
 847         err = fl_set_key(net, tb, &f->key, &mask->key);
 848         if (err)
 849                 goto errout;
 850
 851         fl_mask_update_range(mask);
 852         fl_set_masked_key(&f->mkey, &f->key, mask);
 853
 854         tcf_exts_change(tp, &f->exts, &e);
 855
 856         return 0;
 857 errout:
 858         tcf_exts_destroy(&e);
 859         return err;
 860 }
 861
 862 static u32 fl_grab_new_handle(struct tcf_proto *tp,
 863                               struct cls_fl_head *head)
 864 {
 865         unsigned int i = 0x80000000;
 866         u32 handle;
 867
 868         do {
 869                 if (++head->hgen == 0x7FFFFFFF)
 870                         head->hgen = 1;
 871         } while (--i > 0 && fl_get(tp, head->hgen));
 872
 873         if (unlikely(i == 0)) {
 874                 pr_err("Insufficient number of handles\n");
 875                 handle = 0;
 876         } else {
 877                 handle = head->hgen;
 878         }
 879
 880         return handle;
 881 }
 882
 883 static int fl_change(struct net *net, struct sk_buff *in_skb,
 884                      struct tcf_proto *tp, unsigned long base,
 885                      u32 handle, struct nlattr **tca,
 886                      unsigned long *arg, bool ovr)
 887 {
 888         struct cls_fl_head *head = rtnl_dereference(tp->root);
 889         struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
 890         struct cls_fl_filter *fnew;
 891         struct nlattr **tb;
 892         struct fl_flow_mask mask = {};
 893         int err;
 894
 895         if (!tca[TCA_OPTIONS])
 896                 return -EINVAL;
 897
 898         tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
 899         if (!tb)
 900                 return -ENOBUFS;
 901
 902         err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
 903                                fl_policy, NULL);
 904         if (err < 0)
 905                 goto errout_tb;
 906
 907         if (fold && handle && fold->handle != handle) {
 908                 err = -EINVAL;
 909                 goto errout_tb;
 910         }
 911
 912         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
 913         if (!fnew) {
 914                 err = -ENOBUFS;
 915                 goto errout_tb;
 916         }
 917
 918         err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
 919         if (err < 0)
 920                 goto errout;
 921
 922         if (!handle) {
 923                 handle = fl_grab_new_handle(tp, head);
 924                 if (!handle) {
 925                         err = -EINVAL;
 926                         goto errout;
 927                 }
 928         }
 929         fnew->handle = handle;
 930
 931         if (tb[TCA_FLOWER_FLAGS]) {
 932                 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
 933
 934                 if (!tc_flags_valid(fnew->flags)) {
 935                         err = -EINVAL;
 936                         goto errout;
 937                 }
 938         }
 939
 940         err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
 941         if (err)
 942                 goto errout;
 943
 944         err = fl_check_assign_mask(head, &mask);
 945         if (err)
 946                 goto errout;
 947
 948         if (!tc_skip_sw(fnew->flags)) {
 949                 if (!fold && fl_lookup(head, &fnew->mkey)) {
 950                         err = -EEXIST;
 951                         goto errout;
 952                 }
 953
 954                 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
 955                                              head->ht_params);
 956                 if (err)
 957                         goto errout;
 958         }
 959
 960         if (!tc_skip_hw(fnew->flags)) {
 961                 err = fl_hw_replace_filter(tp,
 962                                            &head->dissector,
 963                                            &mask.key,
 964                                            fnew);
 965                 if (err)
 966                         goto errout;
 967         }
 968
 969         if (!tc_in_hw(fnew->flags))
 970                 fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 971
 972         if (fold) {
 973                 if (!tc_skip_sw(fold->flags))
 974                         rhashtable_remove_fast(&head->ht, &fold->ht_node,
 975                                                head->ht_params);
 976                 if (!tc_skip_hw(fold->flags))
 977                         fl_hw_destroy_filter(tp, fold);
 978         }
 979
 980         *arg = (unsigned long) fnew;
 981
 982         if (fold) {
 983                 list_replace_rcu(&fold->list, &fnew->list);
 984                 tcf_unbind_filter(tp, &fold->res);
 985                 call_rcu(&fold->rcu, fl_destroy_filter);
 986         } else {
 987                 list_add_tail_rcu(&fnew->list, &head->filters);
 988         }
 989
 990         kfree(tb);
 991         return 0;
 992
 993 errout:
 994         tcf_exts_destroy(&fnew->exts);
 995         kfree(fnew);
 996 errout_tb:
 997         kfree(tb);
 998         return err;
 999 }
1000
1001 static int fl_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
1002 {
1003         struct cls_fl_head *head = rtnl_dereference(tp->root);
1004         struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
1005
1006         if (!tc_skip_sw(f->flags))
1007                 rhashtable_remove_fast(&head->ht, &f->ht_node,
1008                                        head->ht_params);
1009         __fl_delete(tp, f);
1010         *last = list_empty(&head->filters);
1011         return 0;
1012 }
1013
1014 static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1015 {
1016         struct cls_fl_head *head = rtnl_dereference(tp->root);
1017         struct cls_fl_filter *f;
1018
1019         list_for_each_entry_rcu(f, &head->filters, list) {
1020                 if (arg->count < arg->skip)
1021                         goto skip;
1022                 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
1023                         arg->stop = 1;
1024                         break;
1025                 }
1026 skip:
1027                 arg->count++;
1028         }
1029 }
1030
1031 static int fl_dump_key_val(struct sk_buff *skb,
1032                            void *val, int val_type,
1033                            void *mask, int mask_type, int len)
1034 {
1035         int err;
1036
1037         if (!memchr_inv(mask, 0, len))
1038                 return 0;
1039         err = nla_put(skb, val_type, len, val);
1040         if (err)
1041                 return err;
1042         if (mask_type != TCA_FLOWER_UNSPEC) {
1043                 err = nla_put(skb, mask_type, len, mask);
1044                 if (err)
1045                         return err;
1046         }
1047         return 0;
1048 }
1049
1050 static int fl_dump_key_mpls(struct sk_buff *skb,
1051                             struct flow_dissector_key_mpls *mpls_key,
1052                             struct flow_dissector_key_mpls *mpls_mask)
1053 {
1054         int err;
1055
1056         if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask)))
1057                 return 0;
1058         if (mpls_mask->mpls_ttl) {
1059                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL,
1060                                  mpls_key->mpls_ttl);
1061                 if (err)
1062                         return err;
1063         }
1064         if (mpls_mask->mpls_tc) {
1065                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC,
1066                                  mpls_key->mpls_tc);
1067                 if (err)
1068                         return err;
1069         }
1070         if (mpls_mask->mpls_label) {
1071                 err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL,
1072                                   mpls_key->mpls_label);
1073                 if (err)
1074                         return err;
1075         }
1076         if (mpls_mask->mpls_bos) {
1077                 err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS,
1078                                  mpls_key->mpls_bos);
1079                 if (err)
1080                         return err;
1081         }
1082         return 0;
1083 }
1084
1085 static int fl_dump_key_vlan(struct sk_buff *skb,
1086                             struct flow_dissector_key_vlan *vlan_key,
1087                             struct flow_dissector_key_vlan *vlan_mask)
1088 {
1089         int err;
1090
1091         if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
1092                 return 0;
1093         if (vlan_mask->vlan_id) {
1094                 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
1095                                   vlan_key->vlan_id);
1096                 if (err)
1097                         return err;
1098         }
1099         if (vlan_mask->vlan_priority) {
1100                 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
1101                                  vlan_key->vlan_priority);
1102                 if (err)
1103                         return err;
1104         }
1105         return 0;
1106 }
1107
1108 static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
1109                             u32 *flower_key, u32 *flower_mask,
1110                             u32 flower_flag_bit, u32 dissector_flag_bit)
1111 {
1112         if (dissector_mask & dissector_flag_bit) {
1113                 *flower_mask |= flower_flag_bit;
1114                 if (dissector_key & dissector_flag_bit)
1115                         *flower_key |= flower_flag_bit;
1116         }
1117 }
1118
1119 static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
1120 {
1121         u32 key, mask;
1122         __be32 _key, _mask;
1123         int err;
1124
1125         if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
1126                 return 0;
1127
1128         key = 0;
1129         mask = 0;
1130
1131         fl_get_key_flag(flags_key, flags_mask, &key, &mask,
1132                         TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
1133
1134         _key = cpu_to_be32(key);
1135         _mask = cpu_to_be32(mask);
1136
1137         err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
1138         if (err)
1139                 return err;
1140
1141         return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
1142 }
1143
1144 static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
1145                    struct sk_buff *skb, struct tcmsg *t)
1146 {
1147         struct cls_fl_head *head = rtnl_dereference(tp->root);
1148         struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
1149         struct nlattr *nest;
1150         struct fl_flow_key *key, *mask;
1151
1152         if (!f)
1153                 return skb->len;
1154
1155         t->tcm_handle = f->handle;
1156
1157         nest = nla_nest_start(skb, TCA_OPTIONS);
1158         if (!nest)
1159                 goto nla_put_failure;
1160
1161         if (f->res.classid &&
1162             nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
1163                 goto nla_put_failure;
1164
1165         key = &f->key;
1166         mask = &head->mask.key;
1167
1168         if (mask->indev_ifindex) {
1169                 struct net_device *dev;
1170
1171                 dev = __dev_get_by_index(net, key->indev_ifindex);
1172                 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
1173                         goto nla_put_failure;
1174         }
1175
1176         if (!tc_skip_hw(f->flags))
1177                 fl_hw_update_stats(tp, f);
1178
1179         if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
1180                             mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
1181                             sizeof(key->eth.dst)) ||
1182             fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
1183                             mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
1184                             sizeof(key->eth.src)) ||
1185             fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
1186                             &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
1187                             sizeof(key->basic.n_proto)))
1188                 goto nla_put_failure;
1189
1190         if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls))
1191                 goto nla_put_failure;
1192
1193         if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
1194                 goto nla_put_failure;
1195
1196         if ((key->basic.n_proto == htons(ETH_P_IP) ||
1197              key->basic.n_proto == htons(ETH_P_IPV6)) &&
1198             fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
1199                             &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
1200                             sizeof(key->basic.ip_proto)))
1201                 goto nla_put_failure;
1202
1203         if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1204             (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
1205                              &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
1206                              sizeof(key->ipv4.src)) ||
1207              fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
1208                              &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
1209                              sizeof(key->ipv4.dst))))
1210                 goto nla_put_failure;
1211         else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1212                  (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
1213                                   &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
1214                                   sizeof(key->ipv6.src)) ||
1215                   fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
1216                                   &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
1217                                   sizeof(key->ipv6.dst))))
1218                 goto nla_put_failure;
1219
1220         if (key->basic.ip_proto == IPPROTO_TCP &&
1221             (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
1222                              &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
1223                              sizeof(key->tp.src)) ||
1224              fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
1225                              &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
1226                              sizeof(key->tp.dst)) ||
1227              fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
1228                              &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
1229                              sizeof(key->tcp.flags))))
1230                 goto nla_put_failure;
1231         else if (key->basic.ip_proto == IPPROTO_UDP &&
1232                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
1233                                   &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
1234                                   sizeof(key->tp.src)) ||
1235                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
1236                                   &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
1237                                   sizeof(key->tp.dst))))
1238                 goto nla_put_failure;
1239         else if (key->basic.ip_proto == IPPROTO_SCTP &&
1240                  (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_SCTP_SRC,
1241                                   &mask->tp.src, TCA_FLOWER_KEY_SCTP_SRC_MASK,
1242                                   sizeof(key->tp.src)) ||
1243                   fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
1244                                   &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
1245                                   sizeof(key->tp.dst))))
1246                 goto nla_put_failure;
1247         else if (key->basic.n_proto == htons(ETH_P_IP) &&
1248                  key->basic.ip_proto == IPPROTO_ICMP &&
1249                  (fl_dump_key_val(skb, &key->icmp.type,
1250                                   TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type,
1251                                   TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
1252                                   sizeof(key->icmp.type)) ||
1253                   fl_dump_key_val(skb, &key->icmp.code,
1254                                   TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code,
1255                                   TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
1256                                   sizeof(key->icmp.code))))
1257                 goto nla_put_failure;
1258         else if (key->basic.n_proto == htons(ETH_P_IPV6) &&
1259                  key->basic.ip_proto == IPPROTO_ICMPV6 &&
1260                  (fl_dump_key_val(skb, &key->icmp.type,
1261                                   TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type,
1262                                   TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
1263                                   sizeof(key->icmp.type)) ||
1264                   fl_dump_key_val(skb, &key->icmp.code,
1265                                   TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code,
1266                                   TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
1267                                   sizeof(key->icmp.code))))
1268                 goto nla_put_failure;
1269         else if ((key->basic.n_proto == htons(ETH_P_ARP) ||
1270                   key->basic.n_proto == htons(ETH_P_RARP)) &&
1271                  (fl_dump_key_val(skb, &key->arp.sip,
1272                                   TCA_FLOWER_KEY_ARP_SIP, &mask->arp.sip,
1273                                   TCA_FLOWER_KEY_ARP_SIP_MASK,
1274                                   sizeof(key->arp.sip)) ||
1275                   fl_dump_key_val(skb, &key->arp.tip,
1276                                   TCA_FLOWER_KEY_ARP_TIP, &mask->arp.tip,
1277                                   TCA_FLOWER_KEY_ARP_TIP_MASK,
1278                                   sizeof(key->arp.tip)) ||
1279                   fl_dump_key_val(skb, &key->arp.op,
1280                                   TCA_FLOWER_KEY_ARP_OP, &mask->arp.op,
1281                                   TCA_FLOWER_KEY_ARP_OP_MASK,
1282                                   sizeof(key->arp.op)) ||
1283                   fl_dump_key_val(skb, key->arp.sha, TCA_FLOWER_KEY_ARP_SHA,
1284                                   mask->arp.sha, TCA_FLOWER_KEY_ARP_SHA_MASK,
1285                                   sizeof(key->arp.sha)) ||
1286                   fl_dump_key_val(skb, key->arp.tha, TCA_FLOWER_KEY_ARP_THA,
1287                                   mask->arp.tha, TCA_FLOWER_KEY_ARP_THA_MASK,
1288                                   sizeof(key->arp.tha))))
1289                 goto nla_put_failure;
1290
1291         if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
1292             (fl_dump_key_val(skb, &key->enc_ipv4.src,
1293                             TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
1294                             TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
1295                             sizeof(key->enc_ipv4.src)) ||
1296              fl_dump_key_val(skb, &key->enc_ipv4.dst,
1297                              TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
1298                              TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
1299                              sizeof(key->enc_ipv4.dst))))
1300                 goto nla_put_failure;
1301         else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
1302                  (fl_dump_key_val(skb, &key->enc_ipv6.src,
1303                             TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
1304                             TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
1305                             sizeof(key->enc_ipv6.src)) ||
1306                  fl_dump_key_val(skb, &key->enc_ipv6.dst,
1307                                  TCA_FLOWER_KEY_ENC_IPV6_DST,
1308                                  &mask->enc_ipv6.dst,
1309                                  TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
1310                             sizeof(key->enc_ipv6.dst))))
1311                 goto nla_put_failure;
1312
1313         if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
1314                             &mask->enc_key_id, TCA_FLOWER_UNSPEC,
1315                             sizeof(key->enc_key_id)) ||
1316             fl_dump_key_val(skb, &key->enc_tp.src,
1317                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT,
1318                             &mask->enc_tp.src,
1319                             TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK,
1320                             sizeof(key->enc_tp.src)) ||
1321             fl_dump_key_val(skb, &key->enc_tp.dst,
1322                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT,
1323                             &mask->enc_tp.dst,
1324                             TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
1325                             sizeof(key->enc_tp.dst)))
1326                 goto nla_put_failure;
1327
1328         if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
1329                 goto nla_put_failure;
1330
1331         if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
1332                 goto nla_put_failure;
1333
1334         if (tcf_exts_dump(skb, &f->exts))
1335                 goto nla_put_failure;
1336
1337         nla_nest_end(skb, nest);
1338
1339         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
1340                 goto nla_put_failure;
1341
1342         return skb->len;
1343
1344 nla_put_failure:
1345         nla_nest_cancel(skb, nest);
1346         return -1;
1347 }
1348
1349 static struct tcf_proto_ops cls_fl_ops __read_mostly = {
1350         .kind           = "flower",
1351         .classify       = fl_classify,
1352         .init           = fl_init,
1353         .destroy        = fl_destroy,
1354         .get            = fl_get,
1355         .change         = fl_change,
1356         .delete         = fl_delete,
1357         .walk           = fl_walk,
1358         .dump           = fl_dump,
1359         .owner          = THIS_MODULE,
1360 };
1361
1362 static int __init cls_fl_init(void)
1363 {
1364         return register_tcf_proto_ops(&cls_fl_ops);
1365 }
1366
1367 static void __exit cls_fl_exit(void)
1368 {
1369         unregister_tcf_proto_ops(&cls_fl_ops);
1370 }
1371
1372 module_init(cls_fl_init);
1373 module_exit(cls_fl_exit);
1374
1375 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
1376 MODULE_DESCRIPTION("Flower classifier");
1377 MODULE_LICENSE("GPL v2");