lib/ofp-actions.h

   1 /*
   2  * Copyright (c) 2012, 2013, 2014, 2015 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef OFP_ACTIONS_H
  18 #define OFP_ACTIONS_H 1
  19
  20 #include <stddef.h>
  21 #include <stdint.h>
  22 #include "meta-flow.h"
  23 #include "ofp-errors.h"
  24 #include "ofp-util.h"
  25 #include "openflow/openflow.h"
  26 #include "openflow/nicira-ext.h"
  27 #include "openvswitch/types.h"
  28
  29 /* List of OVS abstracted actions.
  30  *
  31  * This macro is used directly only internally by this header, but the list is
  32  * still of interest to developers.
  33  *
  34  * Each OFPACT invocation has the following parameters:
  35  *
  36  * 1. <ENUM>, used below in the enum definition of OFPACT_<ENUM>, and
  37  *    elsewhere.
  38  *
  39  * 2. <STRUCT> corresponding to a structure "struct <STRUCT>", that must be
  40  *    defined below.  This structure must be an abstract definition of the
  41  *    action.  Its first member must have type "struct ofpact" and name
  42  *    "ofpact".  It may be fixed length or end with a flexible array member
  43  *    (e.g. "int member[];").
  44  *
  45  * 3. <MEMBER>, which has one of two possible values:
  46  *
  47  *        - If "struct <STRUCT>" is fixed-length, it must be "ofpact".
  48  *
  49  *        - If "struct <STRUCT>" is variable-length, it must be the name of the
  50  *          flexible array member.
  51  *
  52  * 4. <NAME>, a quoted string that gives the name of the action, for use in
  53  *    parsing actions from text.
  54  */
  55 #define OFPACTS                                                         \
  56     /* Output. */                                                       \
  57     OFPACT(OUTPUT,          ofpact_output,      ofpact, "output")       \
  58     OFPACT(GROUP,           ofpact_group,       ofpact, "group")        \
  59     OFPACT(CONTROLLER,      ofpact_controller,  ofpact, "controller")   \
  60     OFPACT(ENQUEUE,         ofpact_enqueue,     ofpact, "enqueue")      \
  61     OFPACT(OUTPUT_REG,      ofpact_output_reg,  ofpact, "output_reg")   \
  62     OFPACT(BUNDLE,          ofpact_bundle,      slaves, "bundle")       \
  63                                                                         \
  64     /* Header changes. */                                               \
  65     OFPACT(SET_FIELD,       ofpact_set_field,   ofpact, "set_field")    \
  66     OFPACT(SET_VLAN_VID,    ofpact_vlan_vid,    ofpact, "set_vlan_vid") \
  67     OFPACT(SET_VLAN_PCP,    ofpact_vlan_pcp,    ofpact, "set_vlan_pcp") \
  68     OFPACT(STRIP_VLAN,      ofpact_null,        ofpact, "strip_vlan")   \
  69     OFPACT(PUSH_VLAN,       ofpact_null,        ofpact, "push_vlan")    \
  70     OFPACT(SET_ETH_SRC,     ofpact_mac,         ofpact, "mod_dl_src")   \
  71     OFPACT(SET_ETH_DST,     ofpact_mac,         ofpact, "mod_dl_dst")   \
  72     OFPACT(SET_IPV4_SRC,    ofpact_ipv4,        ofpact, "mod_nw_src")   \
  73     OFPACT(SET_IPV4_DST,    ofpact_ipv4,        ofpact, "mod_nw_dst")   \
  74     OFPACT(SET_IP_DSCP,     ofpact_dscp,        ofpact, "mod_nw_tos")   \
  75     OFPACT(SET_IP_ECN,      ofpact_ecn,         ofpact, "mod_nw_ecn")   \
  76     OFPACT(SET_IP_TTL,      ofpact_ip_ttl,      ofpact, "mod_nw_ttl")   \
  77     OFPACT(SET_L4_SRC_PORT, ofpact_l4_port,     ofpact, "mod_tp_src")   \
  78     OFPACT(SET_L4_DST_PORT, ofpact_l4_port,     ofpact, "mod_tp_dst")   \
  79     OFPACT(REG_MOVE,        ofpact_reg_move,    ofpact, "move")         \
  80     OFPACT(STACK_PUSH,      ofpact_stack,       ofpact, "push")         \
  81     OFPACT(STACK_POP,       ofpact_stack,       ofpact, "pop")          \
  82     OFPACT(DEC_TTL,         ofpact_cnt_ids,     cnt_ids, "dec_ttl")     \
  83     OFPACT(SET_MPLS_LABEL,  ofpact_mpls_label,  ofpact, "set_mpls_label") \
  84     OFPACT(SET_MPLS_TC,     ofpact_mpls_tc,     ofpact, "set_mpls_tc")  \
  85     OFPACT(SET_MPLS_TTL,    ofpact_mpls_ttl,    ofpact, "set_mpls_ttl") \
  86     OFPACT(DEC_MPLS_TTL,    ofpact_null,        ofpact, "dec_mpls_ttl") \
  87     OFPACT(PUSH_MPLS,       ofpact_push_mpls,   ofpact, "push_mpls")    \
  88     OFPACT(POP_MPLS,        ofpact_pop_mpls,    ofpact, "pop_mpls")     \
  89                                                                         \
  90     /* Metadata. */                                                     \
  91     OFPACT(SET_TUNNEL,      ofpact_tunnel,      ofpact, "set_tunnel")   \
  92     OFPACT(SET_QUEUE,       ofpact_queue,       ofpact, "set_queue")    \
  93     OFPACT(POP_QUEUE,       ofpact_null,        ofpact, "pop_queue")    \
  94     OFPACT(FIN_TIMEOUT,     ofpact_fin_timeout, ofpact, "fin_timeout")  \
  95                                                                         \
  96     /* Flow table interaction. */                                       \
  97     OFPACT(RESUBMIT,        ofpact_resubmit,    ofpact, "resubmit")     \
  98     OFPACT(LEARN,           ofpact_learn,       specs, "learn")         \
  99     OFPACT(CONJUNCTION,     ofpact_conjunction, ofpact, "conjunction")  \
 100                                                                         \
 101     /* Arithmetic. */                                                   \
 102     OFPACT(MULTIPATH,       ofpact_multipath,   ofpact, "multipath")    \
 103                                                                         \
 104     /* Other. */                                                        \
 105     OFPACT(NOTE,            ofpact_note,        data, "note")           \
 106     OFPACT(EXIT,            ofpact_null,        ofpact, "exit")         \
 107     OFPACT(SAMPLE,          ofpact_sample,      ofpact, "sample")       \
 108     OFPACT(UNROLL_XLATE,    ofpact_unroll_xlate, ofpact, "unroll_xlate") \
 109                                                                         \
 110     /* Instructions. */                                                 \
 111     OFPACT(METER,           ofpact_meter,       ofpact, "meter")        \
 112     OFPACT(CLEAR_ACTIONS,   ofpact_null,        ofpact, "clear_actions") \
 113     OFPACT(WRITE_ACTIONS,   ofpact_nest,        ofpact, "write_actions") \
 114     OFPACT(WRITE_METADATA,  ofpact_metadata,    ofpact, "write_metadata") \
 115     OFPACT(GOTO_TABLE,      ofpact_goto_table,  ofpact, "goto_table")
 116
 117 /* enum ofpact_type, with a member OFPACT_<ENUM> for each action. */
 118 enum OVS_PACKED_ENUM ofpact_type {
 119 #define OFPACT(ENUM, STRUCT, MEMBER, NAME) OFPACT_##ENUM,
 120     OFPACTS
 121 #undef OFPACT
 122 };
 123
 124 /* Define N_OFPACTS to the number of types of ofpacts. */
 125 enum {
 126 #define OFPACT(ENUM, STRUCT, MEMBER, NAME) + 1
 127     N_OFPACTS = OFPACTS
 128 #undef OFPACT
 129 };
 130
 131 /* Header for an action.
 132  *
 133  * Each action is a structure "struct ofpact_*" that begins with "struct
 134  * ofpact", usually followed by other data that describes the action.  Actions
 135  * are padded out to a multiple of OFPACT_ALIGNTO bytes in length.
 136  *
 137  * The 'raw' member is special:
 138  *
 139  *     - Most "struct ofpact"s correspond to one particular kind of OpenFlow
 140  *       action, at least in a given OpenFlow version.  For example,
 141  *       OFPACT_SET_VLAN_VID corresponds to OFPAT10_SET_VLAN_VID in OpenFlow
 142  *       1.0.
 143  *
 144  *       For such actions, the 'raw' member is not meaningful and generally
 145  *       should be zero.
 146  *
 147  *     - A few "struct ofpact"s correspond to multiple OpenFlow actions.  For
 148  *       example, OFPACT_SET_TUNNEL can be NXAST_SET_TUNNEL or
 149  *       NXAST_SET_TUNNEL64.  In these cases, if the "struct ofpact" originated
 150  *       from OpenFlow, then we want to make sure that, if it gets translated
 151  *       back to OpenFlow later, it is translated back to the same action type.
 152  *       (Otherwise, we'd violate the promise made in DESIGN, in the "Action
 153  *       Reproduction" section.)
 154  *
 155  *       For such actions, the 'raw' member should be the "enum ofp_raw_action"
 156  *       originally extracted from the OpenFlow action.  (If the action didn't
 157  *       originate from OpenFlow, then setting 'raw' to zero should be fine:
 158  *       code to translate the ofpact to OpenFlow must tolerate this case.)
 159  */
 160 struct ofpact {
 161     /* We want the space advantage of an 8-bit type here on every
 162      * implementation, without giving up the advantage of having a useful type
 163      * on implementations that support packed enums. */
 164 #ifdef HAVE_PACKED_ENUM
 165     enum ofpact_type type;      /* OFPACT_*. */
 166 #else
 167     uint8_t type;               /* OFPACT_* */
 168 #endif
 169
 170     uint8_t raw;                /* Original type when added, if any. */
 171     uint16_t len;               /* Length of the action, in bytes, including
 172                                  * struct ofpact, excluding padding. */
 173 };
 174 BUILD_ASSERT_DECL(sizeof(struct ofpact) == 4);
 175
 176 /* Alignment. */
 177 #define OFPACT_ALIGNTO 8
 178 #define OFPACT_ALIGN(SIZE) ROUND_UP(SIZE, OFPACT_ALIGNTO)
 179
 180 static inline struct ofpact *
 181 ofpact_next(const struct ofpact *ofpact)
 182 {
 183     return (void *) ((uint8_t *) ofpact + OFPACT_ALIGN(ofpact->len));
 184 }
 185
 186 static inline struct ofpact *
 187 ofpact_end(const struct ofpact *ofpacts, size_t ofpacts_len)
 188 {
 189     return (void *) ((uint8_t *) ofpacts + ofpacts_len);
 190 }
 191
 192 /* Assigns POS to each ofpact, in turn, in the OFPACTS_LEN bytes of ofpacts
 193  * starting at OFPACTS. */
 194 #define OFPACT_FOR_EACH(POS, OFPACTS, OFPACTS_LEN)                      \
 195     for ((POS) = (OFPACTS); (POS) < ofpact_end(OFPACTS, OFPACTS_LEN);  \
 196          (POS) = ofpact_next(POS))
 197 \f
 198 /* Action structure for each OFPACT_*. */
 199
 200 /* OFPACT_STRIP_VLAN, OFPACT_POP_QUEUE, OFPACT_EXIT, OFPACT_CLEAR_ACTIONS.
 201  *
 202  * Used for OFPAT10_STRIP_VLAN, NXAST_POP_QUEUE, NXAST_EXIT,
 203  * OFPAT11_POP_VLAN, OFPIT11_CLEAR_ACTIONS.
 204  *
 205  * Action structure for actions that do not have any extra data beyond the
 206  * action type. */
 207 struct ofpact_null {
 208     struct ofpact ofpact;
 209 };
 210
 211 /* OFPACT_OUTPUT.
 212  *
 213  * Used for OFPAT10_OUTPUT. */
 214 struct ofpact_output {
 215     struct ofpact ofpact;
 216     ofp_port_t port;            /* Output port. */
 217     uint16_t max_len;           /* Max send len, for port OFPP_CONTROLLER. */
 218 };
 219
 220 /* OFPACT_CONTROLLER.
 221  *
 222  * Used for NXAST_CONTROLLER. */
 223 struct ofpact_controller {
 224     struct ofpact ofpact;
 225     uint16_t max_len;           /* Maximum length to send to controller. */
 226     uint16_t controller_id;     /* Controller ID to send packet-in. */
 227     enum ofp_packet_in_reason reason; /* Reason to put in packet-in. */
 228 };
 229
 230 /* OFPACT_ENQUEUE.
 231  *
 232  * Used for OFPAT10_ENQUEUE. */
 233 struct ofpact_enqueue {
 234     struct ofpact ofpact;
 235     ofp_port_t port;
 236     uint32_t queue;
 237 };
 238
 239 /* OFPACT_OUTPUT_REG.
 240  *
 241  * Used for NXAST_OUTPUT_REG. */
 242 struct ofpact_output_reg {
 243     struct ofpact ofpact;
 244     uint16_t max_len;
 245     struct mf_subfield src;
 246 };
 247
 248 /* Bundle slave choice algorithm to apply.
 249  *
 250  * In the descriptions below, 'slaves' is the list of possible slaves in the
 251  * order they appear in the OpenFlow action. */
 252 enum nx_bd_algorithm {
 253     /* Chooses the first live slave listed in the bundle.
 254      *
 255      * O(n_slaves) performance. */
 256     NX_BD_ALG_ACTIVE_BACKUP = 0,
 257
 258     /* Highest Random Weight.
 259      *
 260      * for i in [0,n_slaves):
 261      *   weights[i] = hash(flow, i)
 262      * slave = { slaves[i] such that weights[i] >= weights[j] for all j != i }
 263      *
 264      * Redistributes 1/n_slaves of traffic when a slave's liveness changes.
 265      * O(n_slaves) performance.
 266      *
 267      * Uses the 'fields' and 'basis' parameters. */
 268     NX_BD_ALG_HRW = 1
 269 };
 270
 271 /* OFPACT_BUNDLE.
 272  *
 273  * Used for NXAST_BUNDLE. */
 274 struct ofpact_bundle {
 275     struct ofpact ofpact;
 276
 277     /* Slave choice algorithm to apply to hash value. */
 278     enum nx_bd_algorithm algorithm;
 279
 280     /* What fields to hash and how. */
 281     enum nx_hash_fields fields;
 282     uint16_t basis;             /* Universal hash parameter. */
 283
 284     struct mf_subfield dst;
 285
 286     /* Slaves for output. */
 287     unsigned int n_slaves;
 288     ofp_port_t slaves[];
 289 };
 290
 291 /* OFPACT_SET_VLAN_VID.
 292  *
 293  * We keep track if vlan was present at action validation time to avoid a
 294  * PUSH_VLAN when translating to OpenFlow 1.1+.
 295  *
 296  * We also keep the originating OFPUTIL action code in ofpact.compat.
 297  *
 298  * Used for OFPAT10_SET_VLAN_VID and OFPAT11_SET_VLAN_VID. */
 299 struct ofpact_vlan_vid {
 300     struct ofpact ofpact;
 301     uint16_t vlan_vid;          /* VLAN VID in low 12 bits, 0 in other bits. */
 302     bool push_vlan_if_needed;   /* OF 1.0 semantics if true. */
 303     bool flow_has_vlan;         /* VLAN present at action validation time? */
 304 };
 305
 306 /* OFPACT_SET_VLAN_PCP.
 307  *
 308  * We keep track if vlan was present at action validation time to avoid a
 309  * PUSH_VLAN when translating to OpenFlow 1.1+.
 310  *
 311  * We also keep the originating OFPUTIL action code in ofpact.compat.
 312  *
 313  * Used for OFPAT10_SET_VLAN_PCP and OFPAT11_SET_VLAN_PCP. */
 314 struct ofpact_vlan_pcp {
 315     struct ofpact ofpact;
 316     uint8_t vlan_pcp;           /* VLAN PCP in low 3 bits, 0 in other bits. */
 317     bool push_vlan_if_needed;   /* OF 1.0 semantics if true. */
 318     bool flow_has_vlan;         /* VLAN present at action validation time? */
 319 };
 320
 321 /* OFPACT_SET_ETH_SRC, OFPACT_SET_ETH_DST.
 322  *
 323  * Used for OFPAT10_SET_DL_SRC, OFPAT10_SET_DL_DST. */
 324 struct ofpact_mac {
 325     struct ofpact ofpact;
 326     uint8_t mac[ETH_ADDR_LEN];
 327 };
 328
 329 /* OFPACT_SET_IPV4_SRC, OFPACT_SET_IPV4_DST.
 330  *
 331  * Used for OFPAT10_SET_NW_SRC, OFPAT10_SET_NW_DST. */
 332 struct ofpact_ipv4 {
 333     struct ofpact ofpact;
 334     ovs_be32 ipv4;
 335 };
 336
 337 /* OFPACT_SET_IP_DSCP.
 338  *
 339  * Used for OFPAT10_SET_NW_TOS. */
 340 struct ofpact_dscp {
 341     struct ofpact ofpact;
 342     uint8_t dscp;               /* DSCP in high 6 bits, rest ignored. */
 343 };
 344
 345 /* OFPACT_SET_IP_ECN.
 346  *
 347  * Used for OFPAT11_SET_NW_ECN. */
 348 struct ofpact_ecn {
 349     struct ofpact ofpact;
 350     uint8_t ecn;               /* ECN in low 2 bits, rest ignored. */
 351 };
 352
 353 /* OFPACT_SET_IP_TTL.
 354  *
 355  * Used for OFPAT11_SET_NW_TTL. */
 356 struct ofpact_ip_ttl {
 357     struct ofpact ofpact;
 358     uint8_t ttl;
 359 };
 360
 361 /* OFPACT_SET_L4_SRC_PORT, OFPACT_SET_L4_DST_PORT.
 362  *
 363  * Used for OFPAT10_SET_TP_SRC, OFPAT10_SET_TP_DST. */
 364 struct ofpact_l4_port {
 365     struct ofpact ofpact;
 366     uint16_t port;              /* TCP, UDP or SCTP port number. */
 367     uint8_t  flow_ip_proto;     /* IP proto from corresponding match, or 0 */
 368 };
 369
 370 /* OFPACT_REG_MOVE.
 371  *
 372  * Used for NXAST_REG_MOVE. */
 373 struct ofpact_reg_move {
 374     struct ofpact ofpact;
 375     struct mf_subfield src;
 376     struct mf_subfield dst;
 377 };
 378
 379 /* OFPACT_STACK_PUSH.
 380  *
 381  * Used for NXAST_STACK_PUSH and NXAST_STACK_POP. */
 382 struct ofpact_stack {
 383     struct ofpact ofpact;
 384     struct mf_subfield subfield;
 385 };
 386
 387 /* OFPACT_SET_FIELD.
 388  *
 389  * Used for NXAST_REG_LOAD and OFPAT12_SET_FIELD. */
 390 struct ofpact_set_field {
 391     struct ofpact ofpact;
 392     const struct mf_field *field;
 393     bool flow_has_vlan;   /* VLAN present at action validation time. */
 394     union mf_value value;
 395     union mf_value mask;
 396 };
 397
 398 /* OFPACT_PUSH_VLAN/MPLS/PBB
 399  *
 400  * Used for NXAST_PUSH_MPLS, OFPAT11_PUSH_MPLS. */
 401 struct ofpact_push_mpls {
 402     struct ofpact ofpact;
 403     ovs_be16 ethertype;
 404 };
 405
 406 /* OFPACT_POP_MPLS
 407  *
 408  * Used for NXAST_POP_MPLS, OFPAT11_POP_MPLS.. */
 409 struct ofpact_pop_mpls {
 410     struct ofpact ofpact;
 411     ovs_be16 ethertype;
 412 };
 413
 414 /* OFPACT_SET_TUNNEL.
 415  *
 416  * Used for NXAST_SET_TUNNEL, NXAST_SET_TUNNEL64. */
 417 struct ofpact_tunnel {
 418     struct ofpact ofpact;
 419     uint64_t tun_id;
 420 };
 421
 422 /* OFPACT_SET_QUEUE.
 423  *
 424  * Used for NXAST_SET_QUEUE. */
 425 struct ofpact_queue {
 426     struct ofpact ofpact;
 427     uint32_t queue_id;
 428 };
 429
 430 /* OFPACT_FIN_TIMEOUT.
 431  *
 432  * Used for NXAST_FIN_TIMEOUT. */
 433 struct ofpact_fin_timeout {
 434     struct ofpact ofpact;
 435     uint16_t fin_idle_timeout;
 436     uint16_t fin_hard_timeout;
 437 };
 438
 439 /* OFPACT_WRITE_METADATA.
 440  *
 441  * Used for NXAST_WRITE_METADATA. */
 442 struct ofpact_metadata {
 443     struct ofpact ofpact;
 444     ovs_be64 metadata;
 445     ovs_be64 mask;
 446 };
 447
 448 /* OFPACT_METER.
 449  *
 450  * Used for OFPIT13_METER. */
 451 struct ofpact_meter {
 452     struct ofpact ofpact;
 453     uint32_t meter_id;
 454 };
 455
 456 /* OFPACT_WRITE_ACTIONS.
 457  *
 458  * Used for OFPIT11_WRITE_ACTIONS. */
 459 struct ofpact_nest {
 460     struct ofpact ofpact;
 461     uint8_t pad[PAD_SIZE(sizeof(struct ofpact), OFPACT_ALIGNTO)];
 462     struct ofpact actions[];
 463 };
 464 BUILD_ASSERT_DECL(offsetof(struct ofpact_nest, actions) % OFPACT_ALIGNTO == 0);
 465 BUILD_ASSERT_DECL(offsetof(struct ofpact_nest, actions)
 466                   == sizeof(struct ofpact_nest));
 467
 468 static inline size_t
 469 ofpact_nest_get_action_len(const struct ofpact_nest *on)
 470 {
 471     return on->ofpact.len - offsetof(struct ofpact_nest, actions);
 472 }
 473
 474 void ofpacts_execute_action_set(struct ofpbuf *action_list,
 475                                 const struct ofpbuf *action_set);
 476
 477 /* OFPACT_RESUBMIT.
 478  *
 479  * Used for NXAST_RESUBMIT, NXAST_RESUBMIT_TABLE. */
 480 struct ofpact_resubmit {
 481     struct ofpact ofpact;
 482     ofp_port_t in_port;
 483     uint8_t table_id;
 484 };
 485
 486 /* Part of struct ofpact_learn, below. */
 487 struct ofpact_learn_spec {
 488     int n_bits;                 /* Number of bits in source and dest. */
 489
 490     int src_type;               /* One of NX_LEARN_SRC_*. */
 491     struct mf_subfield src;     /* NX_LEARN_SRC_FIELD only. */
 492     union mf_subvalue src_imm;  /* NX_LEARN_SRC_IMMEDIATE only. */
 493
 494     int dst_type;             /* One of NX_LEARN_DST_*. */
 495     struct mf_subfield dst;   /* NX_LEARN_DST_MATCH, NX_LEARN_DST_LOAD only. */
 496 };
 497
 498
 499 /* Bits for 'flags' in struct nx_action_learn.
 500  *
 501  * If NX_LEARN_F_SEND_FLOW_REM is set, then the learned flows will have their
 502  * OFPFF_SEND_FLOW_REM flag set.
 503  *
 504  * If NX_LEARN_F_DELETE_LEARNED is set, then removing this action will delete
 505  * all the flows from the learn action's 'table_id' that have the learn
 506  * action's 'cookie'.  Important points:
 507  *
 508  *     - The deleted flows include those created by this action, those created
 509  *       by other learn actions with the same 'table_id' and 'cookie', those
 510  *       created by flow_mod requests by a controller in the specified table
 511  *       with the specified cookie, and those created through any other
 512  *       means.
 513  *
 514  *     - If multiple flows specify "learn" actions with
 515  *       NX_LEARN_F_DELETE_LEARNED with the same 'table_id' and 'cookie', then
 516  *       no deletion occurs until all of those "learn" actions are deleted.
 517  *
 518  *     - Deleting a flow that contains a learn action is the most obvious way
 519  *       to delete a learn action.  Modifying a flow's actions, or replacing it
 520  *       by a new flow, can also delete a learn action.  Finally, replacing a
 521  *       learn action with NX_LEARN_F_DELETE_LEARNED with a learn action
 522  *       without that flag also effectively deletes the learn action and can
 523  *       trigger flow deletion.
 524  *
 525  * NX_LEARN_F_DELETE_LEARNED was added in Open vSwitch 2.4. */
 526 enum nx_learn_flags {
 527     NX_LEARN_F_SEND_FLOW_REM = 1 << 0,
 528     NX_LEARN_F_DELETE_LEARNED = 1 << 1,
 529 };
 530
 531 #define NX_LEARN_N_BITS_MASK    0x3ff
 532
 533 #define NX_LEARN_SRC_FIELD     (0 << 13) /* Copy from field. */
 534 #define NX_LEARN_SRC_IMMEDIATE (1 << 13) /* Copy from immediate value. */
 535 #define NX_LEARN_SRC_MASK      (1 << 13)
 536
 537 #define NX_LEARN_DST_MATCH     (0 << 11) /* Add match criterion. */
 538 #define NX_LEARN_DST_LOAD      (1 << 11) /* Add NXAST_REG_LOAD action. */
 539 #define NX_LEARN_DST_OUTPUT    (2 << 11) /* Add OFPAT_OUTPUT action. */
 540 #define NX_LEARN_DST_RESERVED  (3 << 11) /* Not yet defined. */
 541 #define NX_LEARN_DST_MASK      (3 << 11)
 542
 543 /* OFPACT_LEARN.
 544  *
 545  * Used for NXAST_LEARN. */
 546 struct ofpact_learn {
 547     struct ofpact ofpact;
 548
 549     uint16_t idle_timeout;      /* Idle time before discarding (seconds). */
 550     uint16_t hard_timeout;      /* Max time before discarding (seconds). */
 551     uint16_t priority;          /* Priority level of flow entry. */
 552     uint8_t table_id;           /* Table to insert flow entry. */
 553     ovs_be64 cookie;            /* Cookie for new flow. */
 554     enum nx_learn_flags flags;  /* NX_LEARN_F_*. */
 555     uint16_t fin_idle_timeout;  /* Idle timeout after FIN, if nonzero. */
 556     uint16_t fin_hard_timeout;  /* Hard timeout after FIN, if nonzero. */
 557
 558     unsigned int n_specs;
 559     struct ofpact_learn_spec specs[];
 560 };
 561
 562 /* Multipath link choice algorithm to apply.
 563  *
 564  * In the descriptions below, 'n_links' is max_link + 1. */
 565 enum nx_mp_algorithm {
 566     /* link = hash(flow) % n_links.
 567      *
 568      * Redistributes all traffic when n_links changes.  O(1) performance.  See
 569      * RFC 2992.
 570      *
 571      * Use UINT16_MAX for max_link to get a raw hash value. */
 572     NX_MP_ALG_MODULO_N = 0,
 573
 574     /* link = hash(flow) / (MAX_HASH / n_links).
 575      *
 576      * Redistributes between one-quarter and one-half of traffic when n_links
 577      * changes.  O(1) performance.  See RFC 2992.
 578      */
 579     NX_MP_ALG_HASH_THRESHOLD = 1,
 580
 581     /* Highest Random Weight.
 582      *
 583      * for i in [0,n_links):
 584      *   weights[i] = hash(flow, i)
 585      * link = { i such that weights[i] >= weights[j] for all j != i }
 586      *
 587      * Redistributes 1/n_links of traffic when n_links changes.  O(n_links)
 588      * performance.  If n_links is greater than a threshold (currently 64, but
 589      * subject to change), Open vSwitch will substitute another algorithm
 590      * automatically.  See RFC 2992. */
 591     NX_MP_ALG_HRW = 2,
 592
 593     /* Iterative Hash.
 594      *
 595      * i = 0
 596      * repeat:
 597      *     i = i + 1
 598      *     link = hash(flow, i) % arg
 599      * while link > max_link
 600      *
 601      * Redistributes 1/n_links of traffic when n_links changes.  O(1)
 602      * performance when arg/max_link is bounded by a constant.
 603      *
 604      * Redistributes all traffic when arg changes.
 605      *
 606      * arg must be greater than max_link and for best performance should be no
 607      * more than approximately max_link * 2.  If arg is outside the acceptable
 608      * range, Open vSwitch will automatically substitute the least power of 2
 609      * greater than max_link.
 610      *
 611      * This algorithm is specific to Open vSwitch.
 612      */
 613     NX_MP_ALG_ITER_HASH = 3,
 614 };
 615
 616 /* OFPACT_CONJUNCTION.
 617  *
 618  * Used for NXAST_CONJUNCTION. */
 619 struct ofpact_conjunction {
 620     struct ofpact ofpact;
 621     uint8_t clause;
 622     uint8_t n_clauses;
 623     uint32_t id;
 624 };
 625
 626 /* OFPACT_MULTIPATH.
 627  *
 628  * Used for NXAST_MULTIPATH. */
 629 struct ofpact_multipath {
 630     struct ofpact ofpact;
 631
 632     /* What fields to hash and how. */
 633     enum nx_hash_fields fields;
 634     uint16_t basis;             /* Universal hash parameter. */
 635
 636     /* Multipath link choice algorithm to apply to hash value. */
 637     enum nx_mp_algorithm algorithm;
 638     uint16_t max_link;          /* Number of output links, minus 1. */
 639     uint32_t arg;               /* Algorithm-specific argument. */
 640
 641     /* Where to store the result. */
 642     struct mf_subfield dst;
 643 };
 644
 645 /* OFPACT_NOTE.
 646  *
 647  * Used for NXAST_NOTE. */
 648 struct ofpact_note {
 649     struct ofpact ofpact;
 650     size_t length;
 651     uint8_t data[];
 652 };
 653
 654 /* OFPACT_SAMPLE.
 655  *
 656  * Used for NXAST_SAMPLE. */
 657 struct ofpact_sample {
 658     struct ofpact ofpact;
 659     uint16_t probability;  // Always >0.
 660     uint32_t collector_set_id;
 661     uint32_t obs_domain_id;
 662     uint32_t obs_point_id;
 663 };
 664
 665 /* OFPACT_DEC_TTL.
 666  *
 667  * Used for OFPAT11_DEC_NW_TTL, NXAST_DEC_TTL and NXAST_DEC_TTL_CNT_IDS. */
 668 struct ofpact_cnt_ids {
 669     struct ofpact ofpact;
 670
 671     /* Controller ids. */
 672     unsigned int n_controllers;
 673     uint16_t cnt_ids[];
 674 };
 675
 676 /* OFPACT_SET_MPLS_LABEL.
 677  *
 678  * Used for OFPAT11_SET_MPLS_LABEL and NXAST_SET_MPLS_LABEL */
 679 struct ofpact_mpls_label {
 680     struct ofpact ofpact;
 681
 682     ovs_be32 label;
 683 };
 684
 685 /* OFPACT_SET_MPLS_TC.
 686  *
 687  * Used for OFPAT11_SET_MPLS_TC and NXAST_SET_MPLS_TC */
 688 struct ofpact_mpls_tc {
 689     struct ofpact ofpact;
 690
 691     uint8_t tc;
 692 };
 693
 694 /* OFPACT_SET_MPLS_TTL.
 695  *
 696  * Used for OFPAT11_SET_MPLS_TTL and NXAST_SET_MPLS_TTL */
 697 struct ofpact_mpls_ttl {
 698     struct ofpact ofpact;
 699
 700     uint8_t ttl;
 701 };
 702
 703 /* OFPACT_GOTO_TABLE
 704  *
 705  * Used for OFPIT11_GOTO_TABLE */
 706 struct ofpact_goto_table {
 707     struct ofpact ofpact;
 708     uint8_t table_id;
 709 };
 710
 711 /* OFPACT_GROUP.
 712  *
 713  * Used for OFPAT11_GROUP. */
 714 struct ofpact_group {
 715     struct ofpact ofpact;
 716     uint32_t group_id;
 717 };
 718
 719 /* OFPACT_UNROLL_XLATE.
 720  *
 721  * Used only internally. */
 722 struct ofpact_unroll_xlate {
 723     struct ofpact ofpact;
 724
 725     /* Metadata in xlate context, visible to controller via PACKET_INs. */
 726     uint8_t  rule_table_id;       /* 0xFF if none. */
 727     ovs_be64 rule_cookie;         /* OVS_BE64_MAX if none. */
 728 };
 729
 730 /* Converting OpenFlow to ofpacts. */
 731 enum ofperr ofpacts_pull_openflow_actions(struct ofpbuf *openflow,
 732                                           unsigned int actions_len,
 733                                           enum ofp_version version,
 734                                           struct ofpbuf *ofpacts);
 735 enum ofperr ofpacts_pull_openflow_instructions(struct ofpbuf *openflow,
 736                                                unsigned int instructions_len,
 737                                                enum ofp_version version,
 738                                                struct ofpbuf *ofpacts);
 739 enum ofperr ofpacts_check(struct ofpact[], size_t ofpacts_len,
 740                           struct flow *, ofp_port_t max_ports,
 741                           uint8_t table_id, uint8_t n_tables,
 742                           enum ofputil_protocol *usable_protocols);
 743 enum ofperr ofpacts_check_consistency(struct ofpact[], size_t ofpacts_len,
 744                                       struct flow *, ofp_port_t max_ports,
 745                                       uint8_t table_id, uint8_t n_tables,
 746                                       enum ofputil_protocol usable_protocols);
 747 enum ofperr ofpact_check_output_port(ofp_port_t port, ofp_port_t max_ports);
 748
 749 /* Converting ofpacts to OpenFlow. */
 750 size_t ofpacts_put_openflow_actions(const struct ofpact[], size_t ofpacts_len,
 751                                     struct ofpbuf *openflow, enum ofp_version);
 752 void ofpacts_put_openflow_instructions(const struct ofpact[],
 753                                        size_t ofpacts_len,
 754                                        struct ofpbuf *openflow,
 755                                        enum ofp_version ofp_version);
 756
 757 /* Sets of supported actions. */
 758 ovs_be32 ofpact_bitmap_to_openflow(uint64_t ofpacts_bitmap, enum ofp_version);
 759 uint64_t ofpact_bitmap_from_openflow(ovs_be32 ofpat_bitmap, enum ofp_version);
 760 void ofpact_bitmap_format(uint64_t ofpacts_bitmap, struct ds *);
 761
 762 /* Working with ofpacts. */
 763 bool ofpacts_output_to_port(const struct ofpact[], size_t ofpacts_len,
 764                             ofp_port_t port);
 765 bool ofpacts_output_to_group(const struct ofpact[], size_t ofpacts_len,
 766                              uint32_t group_id);
 767 bool ofpacts_equal(const struct ofpact a[], size_t a_len,
 768                    const struct ofpact b[], size_t b_len);
 769 uint32_t ofpacts_get_meter(const struct ofpact[], size_t ofpacts_len);
 770
 771 /* Formatting and parsing ofpacts. */
 772 void ofpacts_format(const struct ofpact[], size_t ofpacts_len, struct ds *);
 773 char *ofpacts_parse_actions(const char *, struct ofpbuf *ofpacts,
 774                             enum ofputil_protocol *usable_protocols)
 775     OVS_WARN_UNUSED_RESULT;
 776 char *ofpacts_parse_instructions(const char *, struct ofpbuf *ofpacts,
 777                                  enum ofputil_protocol *usable_protocols)
 778     OVS_WARN_UNUSED_RESULT;
 779 const char *ofpact_name(enum ofpact_type);
 780
 781 /* Internal use by the helpers below. */
 782 void ofpact_init(struct ofpact *, enum ofpact_type, size_t len);
 783 void *ofpact_put(struct ofpbuf *, enum ofpact_type, size_t len);
 784
 785 /* For each OFPACT_<ENUM> with a corresponding struct <STRUCT>, this defines
 786  * the following commonly useful functions:
 787  *
 788  *   struct <STRUCT> *ofpact_put_<ENUM>(struct ofpbuf *ofpacts);
 789  *
 790  *     Appends a new 'ofpact', of length OFPACT_<ENUM>_RAW_SIZE, to 'ofpacts',
 791  *     initializes it with ofpact_init_<ENUM>(), and returns it.  Also sets
 792  *     'ofpacts->l2' to the returned action.
 793  *
 794  *     After using this function to add a variable-length action, add the
 795  *     elements of the flexible array (e.g. with ofpbuf_put()), then use
 796  *     ofpact_update_len() to update the length embedded into the action.
 797  *     (Keep in mind the need to refresh the structure from 'ofpacts->frame'
 798  *     after adding data to 'ofpacts'.)
 799  *
 800  *   struct <STRUCT> *ofpact_get_<ENUM>(const struct ofpact *ofpact);
 801  *
 802  *     Returns 'ofpact' cast to "struct <STRUCT> *".  'ofpact->type' must be
 803  *     OFPACT_<ENUM>.
 804  *
 805  * as well as the following more rarely useful definitions:
 806  *
 807  *   void ofpact_init_<ENUM>(struct <STRUCT> *ofpact);
 808  *
 809  *     Initializes the parts of 'ofpact' that identify it as having type
 810  *     OFPACT_<ENUM> and length OFPACT_<ENUM>_RAW_SIZE and zeros the rest.
 811  *
 812  *   <ENUM>_RAW_SIZE
 813  *
 814  *     The size of the action structure.  For a fixed-length action, this is
 815  *     sizeof(struct <STRUCT>).  For a variable-length action, this is the
 816  *     offset to the variable-length part.
 817  *
 818  *   <ENUM>_SIZE
 819  *
 820  *     An integer constant, the value of OFPACT_<ENUM>_RAW_SIZE rounded up to a
 821  *     multiple of OFPACT_ALIGNTO.
 822  */
 823 #define OFPACT(ENUM, STRUCT, MEMBER, NAME)                              \
 824     BUILD_ASSERT_DECL(offsetof(struct STRUCT, ofpact) == 0);            \
 825                                                                         \
 826     enum { OFPACT_##ENUM##_RAW_SIZE                                     \
 827            = (offsetof(struct STRUCT, MEMBER)                           \
 828               ? offsetof(struct STRUCT, MEMBER)                         \
 829               : sizeof(struct STRUCT)) };                               \
 830                                                                         \
 831     enum { OFPACT_##ENUM##_SIZE                                         \
 832            = ROUND_UP(OFPACT_##ENUM##_RAW_SIZE, OFPACT_ALIGNTO) };      \
 833                                                                         \
 834     static inline struct STRUCT *                                       \
 835     ofpact_get_##ENUM(const struct ofpact *ofpact)                      \
 836     {                                                                   \
 837         ovs_assert(ofpact->type == OFPACT_##ENUM);                      \
 838         return ALIGNED_CAST(struct STRUCT *, ofpact);                   \
 839     }                                                                   \
 840                                                                         \
 841     static inline struct STRUCT *                                       \
 842     ofpact_put_##ENUM(struct ofpbuf *ofpacts)                           \
 843     {                                                                   \
 844         return ofpact_put(ofpacts, OFPACT_##ENUM,                       \
 845                           OFPACT_##ENUM##_RAW_SIZE);                    \
 846     }                                                                   \
 847                                                                         \
 848     static inline void                                                  \
 849     ofpact_init_##ENUM(struct STRUCT *ofpact)                           \
 850     {                                                                   \
 851         ofpact_init(&ofpact->ofpact, OFPACT_##ENUM,                     \
 852                     OFPACT_##ENUM##_RAW_SIZE);                          \
 853     }
 854 OFPACTS
 855 #undef OFPACT
 856
 857 /* Functions to use after adding ofpacts to a buffer. */
 858 void ofpact_update_len(struct ofpbuf *, struct ofpact *);
 859 void ofpact_pad(struct ofpbuf *);
 860
 861 /* Additional functions for composing ofpacts. */
 862 struct ofpact_set_field *ofpact_put_reg_load(struct ofpbuf *ofpacts);
 863
 864 /* OpenFlow 1.1 instructions.
 865  * The order is sorted in execution order. Not in the value of OFPIT11_xxx.
 866  * It is enforced on parser from text string.
 867  */
 868 #define OVS_INSTRUCTIONS                                    \
 869     DEFINE_INST(OFPIT13_METER,                              \
 870                 ofp13_instruction_meter,          false,    \
 871                 "meter")                                    \
 872                                                             \
 873     DEFINE_INST(OFPIT11_APPLY_ACTIONS,                      \
 874                 ofp11_instruction_actions,        true,     \
 875                 "apply_actions")                            \
 876                                                             \
 877     DEFINE_INST(OFPIT11_CLEAR_ACTIONS,                      \
 878                 ofp11_instruction,                false,    \
 879                 "clear_actions")                            \
 880                                                             \
 881     DEFINE_INST(OFPIT11_WRITE_ACTIONS,                      \
 882                 ofp11_instruction_actions,        true,     \
 883                 "write_actions")                            \
 884                                                             \
 885     DEFINE_INST(OFPIT11_WRITE_METADATA,                     \
 886                 ofp11_instruction_write_metadata, false,    \
 887                 "write_metadata")                           \
 888                                                             \
 889     DEFINE_INST(OFPIT11_GOTO_TABLE,                         \
 890                 ofp11_instruction_goto_table,     false,    \
 891                 "goto_table")
 892
 893 enum ovs_instruction_type {
 894 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) OVSINST_##ENUM,
 895     OVS_INSTRUCTIONS
 896 #undef DEFINE_INST
 897 };
 898
 899 enum {
 900 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) + 1
 901     N_OVS_INSTRUCTIONS = OVS_INSTRUCTIONS
 902 #undef DEFINE_INST
 903 };
 904
 905 const char *ovs_instruction_name_from_type(enum ovs_instruction_type type);
 906 int ovs_instruction_type_from_name(const char *name);
 907 enum ovs_instruction_type ovs_instruction_type_from_ofpact_type(
 908     enum ofpact_type);
 909 enum ofperr ovs_instruction_type_from_inst_type(
 910     enum ovs_instruction_type *instruction_type, const uint16_t inst_type);
 911
 912 ovs_be32 ovsinst_bitmap_to_openflow(uint32_t ovsinst_bitmap, enum ofp_version);
 913 uint32_t ovsinst_bitmap_from_openflow(ovs_be32 ofpit_bitmap,
 914                                       enum ofp_version);
 915
 916 #endif /* ofp-actions.h */