include/net/flow_offload.h

   1 #ifndef _NET_FLOW_OFFLOAD_H
   2 #define _NET_FLOW_OFFLOAD_H
   3
   4 #include <linux/kernel.h>
   5 #include <linux/list.h>
   6 #include <linux/netlink.h>
   7 #include <net/flow_dissector.h>
   8
   9 struct flow_match {
  10         struct flow_dissector   *dissector;
  11         void                    *mask;
  12         void                    *key;
  13 };
  14
  15 struct flow_match_meta {
  16         struct flow_dissector_key_meta *key, *mask;
  17 };
  18
  19 struct flow_match_basic {
  20         struct flow_dissector_key_basic *key, *mask;
  21 };
  22
  23 struct flow_match_control {
  24         struct flow_dissector_key_control *key, *mask;
  25 };
  26
  27 struct flow_match_eth_addrs {
  28         struct flow_dissector_key_eth_addrs *key, *mask;
  29 };
  30
  31 struct flow_match_vlan {
  32         struct flow_dissector_key_vlan *key, *mask;
  33 };
  34
  35 struct flow_match_ipv4_addrs {
  36         struct flow_dissector_key_ipv4_addrs *key, *mask;
  37 };
  38
  39 struct flow_match_ipv6_addrs {
  40         struct flow_dissector_key_ipv6_addrs *key, *mask;
  41 };
  42
  43 struct flow_match_ip {
  44         struct flow_dissector_key_ip *key, *mask;
  45 };
  46
  47 struct flow_match_ports {
  48         struct flow_dissector_key_ports *key, *mask;
  49 };
  50
  51 struct flow_match_icmp {
  52         struct flow_dissector_key_icmp *key, *mask;
  53 };
  54
  55 struct flow_match_tcp {
  56         struct flow_dissector_key_tcp *key, *mask;
  57 };
  58
  59 struct flow_match_mpls {
  60         struct flow_dissector_key_mpls *key, *mask;
  61 };
  62
  63 struct flow_match_enc_keyid {
  64         struct flow_dissector_key_keyid *key, *mask;
  65 };
  66
  67 struct flow_match_enc_opts {
  68         struct flow_dissector_key_enc_opts *key, *mask;
  69 };
  70
  71 struct flow_match_ct {
  72         struct flow_dissector_key_ct *key, *mask;
  73 };
  74
  75 struct flow_rule;
  76
  77 void flow_rule_match_meta(const struct flow_rule *rule,
  78                           struct flow_match_meta *out);
  79 void flow_rule_match_basic(const struct flow_rule *rule,
  80                            struct flow_match_basic *out);
  81 void flow_rule_match_control(const struct flow_rule *rule,
  82                              struct flow_match_control *out);
  83 void flow_rule_match_eth_addrs(const struct flow_rule *rule,
  84                                struct flow_match_eth_addrs *out);
  85 void flow_rule_match_vlan(const struct flow_rule *rule,
  86                           struct flow_match_vlan *out);
  87 void flow_rule_match_cvlan(const struct flow_rule *rule,
  88                            struct flow_match_vlan *out);
  89 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
  90                                 struct flow_match_ipv4_addrs *out);
  91 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
  92                                 struct flow_match_ipv6_addrs *out);
  93 void flow_rule_match_ip(const struct flow_rule *rule,
  94                         struct flow_match_ip *out);
  95 void flow_rule_match_ports(const struct flow_rule *rule,
  96                            struct flow_match_ports *out);
  97 void flow_rule_match_tcp(const struct flow_rule *rule,
  98                          struct flow_match_tcp *out);
  99 void flow_rule_match_icmp(const struct flow_rule *rule,
 100                           struct flow_match_icmp *out);
 101 void flow_rule_match_mpls(const struct flow_rule *rule,
 102                           struct flow_match_mpls *out);
 103 void flow_rule_match_enc_control(const struct flow_rule *rule,
 104                                  struct flow_match_control *out);
 105 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
 106                                     struct flow_match_ipv4_addrs *out);
 107 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
 108                                     struct flow_match_ipv6_addrs *out);
 109 void flow_rule_match_enc_ip(const struct flow_rule *rule,
 110                             struct flow_match_ip *out);
 111 void flow_rule_match_enc_ports(const struct flow_rule *rule,
 112                                struct flow_match_ports *out);
 113 void flow_rule_match_enc_keyid(const struct flow_rule *rule,
 114                                struct flow_match_enc_keyid *out);
 115 void flow_rule_match_enc_opts(const struct flow_rule *rule,
 116                               struct flow_match_enc_opts *out);
 117 void flow_rule_match_ct(const struct flow_rule *rule,
 118                         struct flow_match_ct *out);
 119
 120 enum flow_action_id {
 121         FLOW_ACTION_ACCEPT              = 0,
 122         FLOW_ACTION_DROP,
 123         FLOW_ACTION_TRAP,
 124         FLOW_ACTION_GOTO,
 125         FLOW_ACTION_REDIRECT,
 126         FLOW_ACTION_MIRRED,
 127         FLOW_ACTION_REDIRECT_INGRESS,
 128         FLOW_ACTION_MIRRED_INGRESS,
 129         FLOW_ACTION_VLAN_PUSH,
 130         FLOW_ACTION_VLAN_POP,
 131         FLOW_ACTION_VLAN_MANGLE,
 132         FLOW_ACTION_TUNNEL_ENCAP,
 133         FLOW_ACTION_TUNNEL_DECAP,
 134         FLOW_ACTION_MANGLE,
 135         FLOW_ACTION_ADD,
 136         FLOW_ACTION_CSUM,
 137         FLOW_ACTION_MARK,
 138         FLOW_ACTION_PTYPE,
 139         FLOW_ACTION_PRIORITY,
 140         FLOW_ACTION_WAKE,
 141         FLOW_ACTION_QUEUE,
 142         FLOW_ACTION_SAMPLE,
 143         FLOW_ACTION_POLICE,
 144         FLOW_ACTION_CT,
 145         FLOW_ACTION_CT_METADATA,
 146         FLOW_ACTION_MPLS_PUSH,
 147         FLOW_ACTION_MPLS_POP,
 148         FLOW_ACTION_MPLS_MANGLE,
 149         FLOW_ACTION_GATE,
 150         FLOW_ACTION_PPPOE_PUSH,
 151         NUM_FLOW_ACTIONS,
 152 };
 153
 154 /* This is mirroring enum pedit_header_type definition for easy mapping between
 155  * tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
 156  * FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
 157  */
 158 enum flow_action_mangle_base {
 159         FLOW_ACT_MANGLE_UNSPEC          = 0,
 160         FLOW_ACT_MANGLE_HDR_TYPE_ETH,
 161         FLOW_ACT_MANGLE_HDR_TYPE_IP4,
 162         FLOW_ACT_MANGLE_HDR_TYPE_IP6,
 163         FLOW_ACT_MANGLE_HDR_TYPE_TCP,
 164         FLOW_ACT_MANGLE_HDR_TYPE_UDP,
 165 };
 166
 167 enum flow_action_hw_stats_bit {
 168         FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
 169         FLOW_ACTION_HW_STATS_DELAYED_BIT,
 170         FLOW_ACTION_HW_STATS_DISABLED_BIT,
 171
 172         FLOW_ACTION_HW_STATS_NUM_BITS
 173 };
 174
 175 enum flow_action_hw_stats {
 176         FLOW_ACTION_HW_STATS_IMMEDIATE =
 177                 BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
 178         FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
 179         FLOW_ACTION_HW_STATS_ANY = FLOW_ACTION_HW_STATS_IMMEDIATE |
 180                                    FLOW_ACTION_HW_STATS_DELAYED,
 181         FLOW_ACTION_HW_STATS_DISABLED =
 182                 BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
 183         FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
 184 };
 185
 186 typedef void (*action_destr)(void *priv);
 187
 188 struct flow_action_cookie {
 189         u32 cookie_len;
 190         u8 cookie[];
 191 };
 192
 193 struct flow_action_cookie *flow_action_cookie_create(void *data,
 194                                                      unsigned int len,
 195                                                      gfp_t gfp);
 196 void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
 197
 198 struct flow_action_entry {
 199         enum flow_action_id             id;
 200         enum flow_action_hw_stats       hw_stats;
 201         action_destr                    destructor;
 202         void                            *destructor_priv;
 203         union {
 204                 u32                     chain_index;    /* FLOW_ACTION_GOTO */
 205                 struct net_device       *dev;           /* FLOW_ACTION_REDIRECT */
 206                 struct {                                /* FLOW_ACTION_VLAN */
 207                         u16             vid;
 208                         __be16          proto;
 209                         u8              prio;
 210                 } vlan;
 211                 struct {                                /* FLOW_ACTION_MANGLE */
 212                                                         /* FLOW_ACTION_ADD */
 213                         enum flow_action_mangle_base htype;
 214                         u32             offset;
 215                         u32             mask;
 216                         u32             val;
 217                 } mangle;
 218                 struct ip_tunnel_info   *tunnel;        /* FLOW_ACTION_TUNNEL_ENCAP */
 219                 u32                     csum_flags;     /* FLOW_ACTION_CSUM */
 220                 u32                     mark;           /* FLOW_ACTION_MARK */
 221                 u16                     ptype;          /* FLOW_ACTION_PTYPE */
 222                 u32                     priority;       /* FLOW_ACTION_PRIORITY */
 223                 struct {                                /* FLOW_ACTION_QUEUE */
 224                         u32             ctx;
 225                         u32             index;
 226                         u8              vf;
 227                 } queue;
 228                 struct {                                /* FLOW_ACTION_SAMPLE */
 229                         struct psample_group    *psample_group;
 230                         u32                     rate;
 231                         u32                     trunc_size;
 232                         bool                    truncate;
 233                 } sample;
 234                 struct {                                /* FLOW_ACTION_POLICE */
 235                         u32                     index;
 236                         u32                     burst;
 237                         u64                     rate_bytes_ps;
 238                         u64                     burst_pkt;
 239                         u64                     rate_pkt_ps;
 240                         u32                     mtu;
 241                 } police;
 242                 struct {                                /* FLOW_ACTION_CT */
 243                         int action;
 244                         u16 zone;
 245                         struct nf_flowtable *flow_table;
 246                 } ct;
 247                 struct {
 248                         unsigned long cookie;
 249                         u32 mark;
 250                         u32 labels[4];
 251                         bool orig_dir;
 252                 } ct_metadata;
 253                 struct {                                /* FLOW_ACTION_MPLS_PUSH */
 254                         u32             label;
 255                         __be16          proto;
 256                         u8              tc;
 257                         u8              bos;
 258                         u8              ttl;
 259                 } mpls_push;
 260                 struct {                                /* FLOW_ACTION_MPLS_POP */
 261                         __be16          proto;
 262                 } mpls_pop;
 263                 struct {                                /* FLOW_ACTION_MPLS_MANGLE */
 264                         u32             label;
 265                         u8              tc;
 266                         u8              bos;
 267                         u8              ttl;
 268                 } mpls_mangle;
 269                 struct {
 270                         u32             index;
 271                         s32             prio;
 272                         u64             basetime;
 273                         u64             cycletime;
 274                         u64             cycletimeext;
 275                         u32             num_entries;
 276                         struct action_gate_entry *entries;
 277                 } gate;
 278                 struct {                                /* FLOW_ACTION_PPPOE_PUSH */
 279                         u16             sid;
 280                 } pppoe;
 281         };
 282         struct flow_action_cookie *cookie; /* user defined action cookie */
 283 };
 284
 285 struct flow_action {
 286         unsigned int                    num_entries;
 287         struct flow_action_entry        entries[];
 288 };
 289
 290 static inline bool flow_action_has_entries(const struct flow_action *action)
 291 {
 292         return action->num_entries;
 293 }
 294
 295 /**
 296  * flow_offload_has_one_action() - check if exactly one action is present
 297  * @action: tc filter flow offload action
 298  *
 299  * Returns true if exactly one action is present.
 300  */
 301 static inline bool flow_offload_has_one_action(const struct flow_action *action)
 302 {
 303         return action->num_entries == 1;
 304 }
 305
 306 #define flow_action_for_each(__i, __act, __actions)                     \
 307         for (__i = 0, __act = &(__actions)->entries[0];                 \
 308              __i < (__actions)->num_entries;                            \
 309              __act = &(__actions)->entries[++__i])
 310
 311 static inline bool
 312 flow_action_mixed_hw_stats_check(const struct flow_action *action,
 313                                  struct netlink_ext_ack *extack)
 314 {
 315         const struct flow_action_entry *action_entry;
 316         u8 last_hw_stats;
 317         int i;
 318
 319         if (flow_offload_has_one_action(action))
 320                 return true;
 321
 322         if (action) {
 323                 flow_action_for_each(i, action_entry, action) {
 324                         if (i && action_entry->hw_stats != last_hw_stats) {
 325                                 NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
 326                                 return false;
 327                         }
 328                         last_hw_stats = action_entry->hw_stats;
 329                 }
 330         }
 331         return true;
 332 }
 333
 334 static inline const struct flow_action_entry *
 335 flow_action_first_entry_get(const struct flow_action *action)
 336 {
 337         WARN_ON(!flow_action_has_entries(action));
 338         return &action->entries[0];
 339 }
 340
 341 static inline bool
 342 __flow_action_hw_stats_check(const struct flow_action *action,
 343                              struct netlink_ext_ack *extack,
 344                              bool check_allow_bit,
 345                              enum flow_action_hw_stats_bit allow_bit)
 346 {
 347         const struct flow_action_entry *action_entry;
 348
 349         if (!flow_action_has_entries(action))
 350                 return true;
 351         if (!flow_action_mixed_hw_stats_check(action, extack))
 352                 return false;
 353
 354         action_entry = flow_action_first_entry_get(action);
 355
 356         /* Zero is not a legal value for hw_stats, catch anyone passing it */
 357         WARN_ON_ONCE(!action_entry->hw_stats);
 358
 359         if (!check_allow_bit &&
 360             ~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
 361                 NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
 362                 return false;
 363         } else if (check_allow_bit &&
 364                    !(action_entry->hw_stats & BIT(allow_bit))) {
 365                 NL_SET_ERR_MSG_MOD(extack, "Driver does not support selected HW stats type");
 366                 return false;
 367         }
 368         return true;
 369 }
 370
 371 static inline bool
 372 flow_action_hw_stats_check(const struct flow_action *action,
 373                            struct netlink_ext_ack *extack,
 374                            enum flow_action_hw_stats_bit allow_bit)
 375 {
 376         return __flow_action_hw_stats_check(action, extack, true, allow_bit);
 377 }
 378
 379 static inline bool
 380 flow_action_basic_hw_stats_check(const struct flow_action *action,
 381                                  struct netlink_ext_ack *extack)
 382 {
 383         return __flow_action_hw_stats_check(action, extack, false, 0);
 384 }
 385
 386 struct flow_rule {
 387         struct flow_match       match;
 388         struct flow_action      action;
 389 };
 390
 391 struct flow_rule *flow_rule_alloc(unsigned int num_actions);
 392
 393 static inline bool flow_rule_match_key(const struct flow_rule *rule,
 394                                        enum flow_dissector_key_id key)
 395 {
 396         return dissector_uses_key(rule->match.dissector, key);
 397 }
 398
 399 struct flow_stats {
 400         u64     pkts;
 401         u64     bytes;
 402         u64     drops;
 403         u64     lastused;
 404         enum flow_action_hw_stats used_hw_stats;
 405         bool used_hw_stats_valid;
 406 };
 407
 408 static inline void flow_stats_update(struct flow_stats *flow_stats,
 409                                      u64 bytes, u64 pkts,
 410                                      u64 drops, u64 lastused,
 411                                      enum flow_action_hw_stats used_hw_stats)
 412 {
 413         flow_stats->pkts        += pkts;
 414         flow_stats->bytes       += bytes;
 415         flow_stats->drops       += drops;
 416         flow_stats->lastused    = max_t(u64, flow_stats->lastused, lastused);
 417
 418         /* The driver should pass value with a maximum of one bit set.
 419          * Passing FLOW_ACTION_HW_STATS_ANY is invalid.
 420          */
 421         WARN_ON(used_hw_stats == FLOW_ACTION_HW_STATS_ANY);
 422         flow_stats->used_hw_stats |= used_hw_stats;
 423         flow_stats->used_hw_stats_valid = true;
 424 }
 425
 426 enum flow_block_command {
 427         FLOW_BLOCK_BIND,
 428         FLOW_BLOCK_UNBIND,
 429 };
 430
 431 enum flow_block_binder_type {
 432         FLOW_BLOCK_BINDER_TYPE_UNSPEC,
 433         FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
 434         FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
 435         FLOW_BLOCK_BINDER_TYPE_RED_EARLY_DROP,
 436         FLOW_BLOCK_BINDER_TYPE_RED_MARK,
 437 };
 438
 439 struct flow_block {
 440         struct list_head cb_list;
 441 };
 442
 443 struct netlink_ext_ack;
 444
 445 struct flow_block_offload {
 446         enum flow_block_command command;
 447         enum flow_block_binder_type binder_type;
 448         bool block_shared;
 449         bool unlocked_driver_cb;
 450         struct net *net;
 451         struct flow_block *block;
 452         struct list_head cb_list;
 453         struct list_head *driver_block_list;
 454         struct netlink_ext_ack *extack;
 455         struct Qdisc *sch;
 456 };
 457
 458 enum tc_setup_type;
 459 typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
 460                             void *cb_priv);
 461
 462 struct flow_block_cb;
 463
 464 struct flow_block_indr {
 465         struct list_head                list;
 466         struct net_device               *dev;
 467         struct Qdisc                    *sch;
 468         enum flow_block_binder_type     binder_type;
 469         void                            *data;
 470         void                            *cb_priv;
 471         void                            (*cleanup)(struct flow_block_cb *block_cb);
 472 };
 473
 474 struct flow_block_cb {
 475         struct list_head        driver_list;
 476         struct list_head        list;
 477         flow_setup_cb_t         *cb;
 478         void                    *cb_ident;
 479         void                    *cb_priv;
 480         void                    (*release)(void *cb_priv);
 481         struct flow_block_indr  indr;
 482         unsigned int            refcnt;
 483 };
 484
 485 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
 486                                           void *cb_ident, void *cb_priv,
 487                                           void (*release)(void *cb_priv));
 488 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
 489                                                void *cb_ident, void *cb_priv,
 490                                                void (*release)(void *cb_priv),
 491                                                struct flow_block_offload *bo,
 492                                                struct net_device *dev,
 493                                                struct Qdisc *sch, void *data,
 494                                                void *indr_cb_priv,
 495                                                void (*cleanup)(struct flow_block_cb *block_cb));
 496 void flow_block_cb_free(struct flow_block_cb *block_cb);
 497
 498 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
 499                                            flow_setup_cb_t *cb, void *cb_ident);
 500
 501 void *flow_block_cb_priv(struct flow_block_cb *block_cb);
 502 void flow_block_cb_incref(struct flow_block_cb *block_cb);
 503 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
 504
 505 static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
 506                                      struct flow_block_offload *offload)
 507 {
 508         list_add_tail(&block_cb->list, &offload->cb_list);
 509 }
 510
 511 static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
 512                                         struct flow_block_offload *offload)
 513 {
 514         list_move(&block_cb->list, &offload->cb_list);
 515 }
 516
 517 static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
 518                                              struct flow_block_offload *offload)
 519 {
 520         list_del(&block_cb->indr.list);
 521         list_move(&block_cb->list, &offload->cb_list);
 522 }
 523
 524 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
 525                            struct list_head *driver_block_list);
 526
 527 int flow_block_cb_setup_simple(struct flow_block_offload *f,
 528                                struct list_head *driver_list,
 529                                flow_setup_cb_t *cb,
 530                                void *cb_ident, void *cb_priv, bool ingress_only);
 531
 532 enum flow_cls_command {
 533         FLOW_CLS_REPLACE,
 534         FLOW_CLS_DESTROY,
 535         FLOW_CLS_STATS,
 536         FLOW_CLS_TMPLT_CREATE,
 537         FLOW_CLS_TMPLT_DESTROY,
 538 };
 539
 540 struct flow_cls_common_offload {
 541         u32 chain_index;
 542         __be16 protocol;
 543         u32 prio;
 544         struct netlink_ext_ack *extack;
 545 };
 546
 547 struct flow_cls_offload {
 548         struct flow_cls_common_offload common;
 549         enum flow_cls_command command;
 550         unsigned long cookie;
 551         struct flow_rule *rule;
 552         struct flow_stats stats;
 553         u32 classid;
 554 };
 555
 556 static inline struct flow_rule *
 557 flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
 558 {
 559         return flow_cmd->rule;
 560 }
 561
 562 static inline void flow_block_init(struct flow_block *flow_block)
 563 {
 564         INIT_LIST_HEAD(&flow_block->cb_list);
 565 }
 566
 567 typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
 568                                       enum tc_setup_type type, void *type_data,
 569                                       void *data,
 570                                       void (*cleanup)(struct flow_block_cb *block_cb));
 571
 572 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
 573 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
 574                               void (*release)(void *cb_priv));
 575 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
 576                                 enum tc_setup_type type, void *data,
 577                                 struct flow_block_offload *bo,
 578                                 void (*cleanup)(struct flow_block_cb *block_cb));
 579
 580 #endif /* _NET_FLOW_OFFLOAD_H */