lib/odp-execute.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
   3  * Copyright (c) 2013 Simon Horman
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <config.h>
  19 #include "odp-execute.h"
  20 #include <arpa/inet.h>
  21 #include <netinet/in.h>
  22 #include <netinet/icmp6.h>
  23 #include <netinet/ip6.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "dp-packet.h"
  28 #include "dpif.h"
  29 #include "netlink.h"
  30 #include "odp-netlink.h"
  31 #include "odp-util.h"
  32 #include "packets.h"
  33 #include "flow.h"
  34 #include "unaligned.h"
  35 #include "util.h"
  36
  37 /* Masked copy of an ethernet address. 'src' is already properly masked. */
  38 static void
  39 ether_addr_copy_masked(uint8_t *dst, const uint8_t *src,
  40                        const uint8_t *mask)
  41 {
  42     int i;
  43
  44     for (i = 0; i < ETH_ADDR_LEN; i++) {
  45         dst[i] = src[i] | (dst[i] & ~mask[i]);
  46     }
  47 }
  48
  49 static void
  50 odp_eth_set_addrs(struct dp_packet *packet, const struct ovs_key_ethernet *key,
  51                   const struct ovs_key_ethernet *mask)
  52 {
  53     struct eth_header *eh = dp_packet_l2(packet);
  54
  55     if (eh) {
  56         if (!mask) {
  57             memcpy(eh->eth_src, key->eth_src, sizeof eh->eth_src);
  58             memcpy(eh->eth_dst, key->eth_dst, sizeof eh->eth_dst);
  59         } else {
  60             ether_addr_copy_masked(eh->eth_src, key->eth_src, mask->eth_src);
  61             ether_addr_copy_masked(eh->eth_dst, key->eth_dst, mask->eth_dst);
  62         }
  63     }
  64 }
  65
  66 static void
  67 odp_set_ipv4(struct dp_packet *packet, const struct ovs_key_ipv4 *key,
  68              const struct ovs_key_ipv4 *mask)
  69 {
  70     struct ip_header *nh = dp_packet_l3(packet);
  71
  72     packet_set_ipv4(
  73         packet,
  74         key->ipv4_src | (get_16aligned_be32(&nh->ip_src) & ~mask->ipv4_src),
  75         key->ipv4_dst | (get_16aligned_be32(&nh->ip_dst) & ~mask->ipv4_dst),
  76         key->ipv4_tos | (nh->ip_tos & ~mask->ipv4_tos),
  77         key->ipv4_ttl | (nh->ip_ttl & ~mask->ipv4_ttl));
  78 }
  79
  80 static const ovs_be32 *
  81 mask_ipv6_addr(const ovs_16aligned_be32 *old, const ovs_be32 *addr,
  82                const ovs_be32 *mask, ovs_be32 *masked)
  83 {
  84     for (int i = 0; i < 4; i++) {
  85         masked[i] = addr[i] | (get_16aligned_be32(&old[i]) & ~mask[i]);
  86     }
  87
  88     return masked;
  89 }
  90
  91 static void
  92 odp_set_ipv6(struct dp_packet *packet, const struct ovs_key_ipv6 *key,
  93              const struct ovs_key_ipv6 *mask)
  94 {
  95     struct ovs_16aligned_ip6_hdr *nh = dp_packet_l3(packet);
  96     ovs_be32 sbuf[4], dbuf[4];
  97     uint8_t old_tc = ntohl(get_16aligned_be32(&nh->ip6_flow)) >> 20;
  98     ovs_be32 old_fl = get_16aligned_be32(&nh->ip6_flow) & htonl(0xfffff);
  99
 100     packet_set_ipv6(
 101         packet,
 102         key->ipv6_proto,
 103         mask_ipv6_addr(nh->ip6_src.be32, key->ipv6_src, mask->ipv6_src, sbuf),
 104         mask_ipv6_addr(nh->ip6_dst.be32, key->ipv6_dst, mask->ipv6_dst, dbuf),
 105         key->ipv6_tclass | (old_tc & ~mask->ipv6_tclass),
 106         key->ipv6_label | (old_fl & ~mask->ipv6_label),
 107         key->ipv6_hlimit | (nh->ip6_hlim & ~mask->ipv6_hlimit));
 108 }
 109
 110 static void
 111 odp_set_tcp(struct dp_packet *packet, const struct ovs_key_tcp *key,
 112              const struct ovs_key_tcp *mask)
 113 {
 114     struct tcp_header *th = dp_packet_l4(packet);
 115
 116     if (OVS_LIKELY(th && dp_packet_get_tcp_payload(packet))) {
 117         packet_set_tcp_port(packet,
 118                             key->tcp_src | (th->tcp_src & ~mask->tcp_src),
 119                             key->tcp_dst | (th->tcp_dst & ~mask->tcp_dst));
 120     }
 121 }
 122
 123 static void
 124 odp_set_udp(struct dp_packet *packet, const struct ovs_key_udp *key,
 125              const struct ovs_key_udp *mask)
 126 {
 127     struct udp_header *uh = dp_packet_l4(packet);
 128
 129     if (OVS_LIKELY(uh && dp_packet_get_udp_payload(packet))) {
 130         packet_set_udp_port(packet,
 131                             key->udp_src | (uh->udp_src & ~mask->udp_src),
 132                             key->udp_dst | (uh->udp_dst & ~mask->udp_dst));
 133     }
 134 }
 135
 136 static void
 137 odp_set_sctp(struct dp_packet *packet, const struct ovs_key_sctp *key,
 138              const struct ovs_key_sctp *mask)
 139 {
 140     struct sctp_header *sh = dp_packet_l4(packet);
 141
 142     if (OVS_LIKELY(sh && dp_packet_get_sctp_payload(packet))) {
 143         packet_set_sctp_port(packet,
 144                              key->sctp_src | (sh->sctp_src & ~mask->sctp_src),
 145                              key->sctp_dst | (sh->sctp_dst & ~mask->sctp_dst));
 146     }
 147 }
 148
 149 static void
 150 odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
 151 {
 152     enum odp_key_fitness fitness;
 153
 154     fitness = odp_tun_key_from_attr(a, tun_key);
 155     ovs_assert(fitness != ODP_FIT_ERROR);
 156 }
 157
 158 static void
 159 set_arp(struct dp_packet *packet, const struct ovs_key_arp *key,
 160         const struct ovs_key_arp *mask)
 161 {
 162     struct arp_eth_header *arp = dp_packet_l3(packet);
 163
 164     if (!mask) {
 165         arp->ar_op = key->arp_op;
 166         memcpy(arp->ar_sha, key->arp_sha, ETH_ADDR_LEN);
 167         put_16aligned_be32(&arp->ar_spa, key->arp_sip);
 168         memcpy(arp->ar_tha, key->arp_tha, ETH_ADDR_LEN);
 169         put_16aligned_be32(&arp->ar_tpa, key->arp_tip);
 170     } else {
 171         ovs_be32 ar_spa = get_16aligned_be32(&arp->ar_spa);
 172         ovs_be32 ar_tpa = get_16aligned_be32(&arp->ar_tpa);
 173
 174         arp->ar_op = key->arp_op | (arp->ar_op & ~mask->arp_op);
 175         ether_addr_copy_masked(arp->ar_sha, key->arp_sha, mask->arp_sha);
 176         put_16aligned_be32(&arp->ar_spa,
 177                            key->arp_sip | (ar_spa & ~mask->arp_sip));
 178         ether_addr_copy_masked(arp->ar_tha, key->arp_tha, mask->arp_tha);
 179         put_16aligned_be32(&arp->ar_tpa,
 180                            key->arp_tip | (ar_tpa & ~mask->arp_tip));
 181     }
 182 }
 183
 184 static void
 185 odp_set_nd(struct dp_packet *packet, const struct ovs_key_nd *key,
 186            const struct ovs_key_nd *mask)
 187 {
 188     const struct ovs_nd_msg *ns = dp_packet_l4(packet);
 189     const struct ovs_nd_opt *nd_opt = dp_packet_get_nd_payload(packet);
 190
 191     if (OVS_LIKELY(ns && nd_opt)) {
 192         int bytes_remain = dp_packet_l4_size(packet) - sizeof(*ns);
 193         ovs_be32 tgt_buf[4];
 194         uint8_t sll_buf[ETH_ADDR_LEN] = {0};
 195         uint8_t tll_buf[ETH_ADDR_LEN] = {0};
 196
 197         while (bytes_remain >= ND_OPT_LEN && nd_opt->nd_opt_len != 0) {
 198             if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
 199                 && nd_opt->nd_opt_len == 1) {
 200                 memcpy(sll_buf, nd_opt->nd_opt_data, ETH_ADDR_LEN);
 201                 ether_addr_copy_masked(sll_buf, key->nd_sll, mask->nd_sll);
 202
 203                 /* A packet can only contain one SLL or TLL option */
 204                 break;
 205             } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
 206                        && nd_opt->nd_opt_len == 1) {
 207                 memcpy(tll_buf, nd_opt->nd_opt_data, ETH_ADDR_LEN);
 208                 ether_addr_copy_masked(tll_buf, key->nd_tll, mask->nd_tll);
 209
 210                 /* A packet can only contain one SLL or TLL option */
 211                 break;
 212             }
 213
 214             nd_opt += nd_opt->nd_opt_len;
 215             bytes_remain -= nd_opt->nd_opt_len * ND_OPT_LEN;
 216         }
 217
 218         packet_set_nd(packet,
 219                       mask_ipv6_addr(ns->target.be32,
 220                                      key->nd_target, mask->nd_target, tgt_buf),
 221                       sll_buf,
 222                       tll_buf);
 223     }
 224 }
 225
 226 static void
 227 odp_execute_set_action(struct dp_packet *packet, const struct nlattr *a)
 228 {
 229     enum ovs_key_attr type = nl_attr_type(a);
 230     const struct ovs_key_ipv4 *ipv4_key;
 231     const struct ovs_key_ipv6 *ipv6_key;
 232     struct pkt_metadata *md = &packet->md;
 233
 234     switch (type) {
 235     case OVS_KEY_ATTR_PRIORITY:
 236         md->skb_priority = nl_attr_get_u32(a);
 237         break;
 238
 239     case OVS_KEY_ATTR_TUNNEL:
 240         odp_set_tunnel_action(a, &md->tunnel);
 241         break;
 242
 243     case OVS_KEY_ATTR_SKB_MARK:
 244         md->pkt_mark = nl_attr_get_u32(a);
 245         break;
 246
 247     case OVS_KEY_ATTR_ETHERNET:
 248         odp_eth_set_addrs(packet, nl_attr_get(a), NULL);
 249         break;
 250
 251     case OVS_KEY_ATTR_IPV4:
 252         ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
 253         packet_set_ipv4(packet, ipv4_key->ipv4_src,
 254                         ipv4_key->ipv4_dst, ipv4_key->ipv4_tos,
 255                         ipv4_key->ipv4_ttl);
 256         break;
 257
 258     case OVS_KEY_ATTR_IPV6:
 259         ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
 260         packet_set_ipv6(packet, ipv6_key->ipv6_proto,
 261                         ipv6_key->ipv6_src, ipv6_key->ipv6_dst,
 262                         ipv6_key->ipv6_tclass, ipv6_key->ipv6_label,
 263                         ipv6_key->ipv6_hlimit);
 264         break;
 265
 266     case OVS_KEY_ATTR_TCP:
 267         if (OVS_LIKELY(dp_packet_get_tcp_payload(packet))) {
 268             const struct ovs_key_tcp *tcp_key
 269                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
 270
 271             packet_set_tcp_port(packet, tcp_key->tcp_src,
 272                                 tcp_key->tcp_dst);
 273         }
 274         break;
 275
 276     case OVS_KEY_ATTR_UDP:
 277         if (OVS_LIKELY(dp_packet_get_udp_payload(packet))) {
 278             const struct ovs_key_udp *udp_key
 279                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
 280
 281             packet_set_udp_port(packet, udp_key->udp_src,
 282                                 udp_key->udp_dst);
 283         }
 284         break;
 285
 286     case OVS_KEY_ATTR_SCTP:
 287         if (OVS_LIKELY(dp_packet_get_sctp_payload(packet))) {
 288             const struct ovs_key_sctp *sctp_key
 289                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
 290
 291             packet_set_sctp_port(packet, sctp_key->sctp_src,
 292                                  sctp_key->sctp_dst);
 293         }
 294         break;
 295
 296     case OVS_KEY_ATTR_MPLS:
 297         set_mpls_lse(packet, nl_attr_get_be32(a));
 298         break;
 299
 300     case OVS_KEY_ATTR_ARP:
 301         set_arp(packet, nl_attr_get(a), NULL);
 302         break;
 303
 304     case OVS_KEY_ATTR_ND:
 305         if (OVS_LIKELY(dp_packet_get_nd_payload(packet))) {
 306             const struct ovs_key_nd *nd_key
 307                    = nl_attr_get_unspec(a, sizeof(struct ovs_key_nd));
 308             packet_set_nd(packet, nd_key->nd_target,
 309                           nd_key->nd_sll, nd_key->nd_tll);
 310         }
 311         break;
 312
 313     case OVS_KEY_ATTR_DP_HASH:
 314         md->dp_hash = nl_attr_get_u32(a);
 315         dp_packet_set_dp_hash(packet, md->dp_hash);
 316         break;
 317
 318     case OVS_KEY_ATTR_RECIRC_ID:
 319         md->recirc_id = nl_attr_get_u32(a);
 320         break;
 321
 322     case OVS_KEY_ATTR_UNSPEC:
 323     case OVS_KEY_ATTR_ENCAP:
 324     case OVS_KEY_ATTR_ETHERTYPE:
 325     case OVS_KEY_ATTR_IN_PORT:
 326     case OVS_KEY_ATTR_VLAN:
 327     case OVS_KEY_ATTR_ICMP:
 328     case OVS_KEY_ATTR_ICMPV6:
 329     case OVS_KEY_ATTR_TCP_FLAGS:
 330     case __OVS_KEY_ATTR_MAX:
 331     default:
 332         OVS_NOT_REACHED();
 333     }
 334 }
 335
 336 #define get_mask(a, type) ((const type *)(const void *)(a + 1) + 1)
 337
 338 static void
 339 odp_execute_masked_set_action(struct dp_packet *packet,
 340                               const struct nlattr *a)
 341 {
 342     struct pkt_metadata *md = &packet->md;
 343     enum ovs_key_attr type = nl_attr_type(a);
 344     struct mpls_hdr *mh;
 345
 346     switch (type) {
 347     case OVS_KEY_ATTR_PRIORITY:
 348         md->skb_priority = nl_attr_get_u32(a)
 349             | (md->skb_priority & ~*get_mask(a, uint32_t));
 350         break;
 351
 352     case OVS_KEY_ATTR_SKB_MARK:
 353         md->pkt_mark = nl_attr_get_u32(a)
 354             | (md->pkt_mark & ~*get_mask(a, uint32_t));
 355         break;
 356
 357     case OVS_KEY_ATTR_ETHERNET:
 358         odp_eth_set_addrs(packet, nl_attr_get(a),
 359                           get_mask(a, struct ovs_key_ethernet));
 360         break;
 361
 362     case OVS_KEY_ATTR_IPV4:
 363         odp_set_ipv4(packet, nl_attr_get(a),
 364                      get_mask(a, struct ovs_key_ipv4));
 365         break;
 366
 367     case OVS_KEY_ATTR_IPV6:
 368         odp_set_ipv6(packet, nl_attr_get(a),
 369                      get_mask(a, struct ovs_key_ipv6));
 370         break;
 371
 372     case OVS_KEY_ATTR_TCP:
 373         odp_set_tcp(packet, nl_attr_get(a),
 374                     get_mask(a, struct ovs_key_tcp));
 375         break;
 376
 377     case OVS_KEY_ATTR_UDP:
 378         odp_set_udp(packet, nl_attr_get(a),
 379                     get_mask(a, struct ovs_key_udp));
 380         break;
 381
 382     case OVS_KEY_ATTR_SCTP:
 383         odp_set_sctp(packet, nl_attr_get(a),
 384                      get_mask(a, struct ovs_key_sctp));
 385         break;
 386
 387     case OVS_KEY_ATTR_MPLS:
 388         mh = dp_packet_l2_5(packet);
 389         if (mh) {
 390             put_16aligned_be32(&mh->mpls_lse, nl_attr_get_be32(a)
 391                                | (get_16aligned_be32(&mh->mpls_lse)
 392                                   & ~*get_mask(a, ovs_be32)));
 393         }
 394         break;
 395
 396     case OVS_KEY_ATTR_ARP:
 397         set_arp(packet, nl_attr_get(a),
 398                 get_mask(a, struct ovs_key_arp));
 399         break;
 400
 401     case OVS_KEY_ATTR_ND:
 402         odp_set_nd(packet, nl_attr_get(a),
 403                    get_mask(a, struct ovs_key_nd));
 404         break;
 405
 406     case OVS_KEY_ATTR_DP_HASH:
 407         md->dp_hash = nl_attr_get_u32(a)
 408             | (dp_packet_get_dp_hash(packet) & ~*get_mask(a, uint32_t));
 409         dp_packet_set_dp_hash(packet, md->dp_hash);
 410         break;
 411
 412     case OVS_KEY_ATTR_RECIRC_ID:
 413         md->recirc_id = nl_attr_get_u32(a)
 414             | (md->recirc_id & ~*get_mask(a, uint32_t));
 415         break;
 416
 417     case OVS_KEY_ATTR_TUNNEL:    /* Masked data not supported for tunnel. */
 418     case OVS_KEY_ATTR_UNSPEC:
 419     case OVS_KEY_ATTR_ENCAP:
 420     case OVS_KEY_ATTR_ETHERTYPE:
 421     case OVS_KEY_ATTR_IN_PORT:
 422     case OVS_KEY_ATTR_VLAN:
 423     case OVS_KEY_ATTR_ICMP:
 424     case OVS_KEY_ATTR_ICMPV6:
 425     case OVS_KEY_ATTR_TCP_FLAGS:
 426     case __OVS_KEY_ATTR_MAX:
 427     default:
 428         OVS_NOT_REACHED();
 429     }
 430 }
 431
 432 static void
 433 odp_execute_sample(void *dp, struct dp_packet *packet, bool steal,
 434                    const struct nlattr *action,
 435                    odp_execute_cb dp_execute_action)
 436 {
 437     const struct nlattr *subactions = NULL;
 438     const struct nlattr *a;
 439     size_t left;
 440
 441     NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
 442         int type = nl_attr_type(a);
 443
 444         switch ((enum ovs_sample_attr) type) {
 445         case OVS_SAMPLE_ATTR_PROBABILITY:
 446             if (random_uint32() >= nl_attr_get_u32(a)) {
 447                 if (steal) {
 448                     dp_packet_delete(packet);
 449                 }
 450                 return;
 451             }
 452             break;
 453
 454         case OVS_SAMPLE_ATTR_ACTIONS:
 455             subactions = a;
 456             break;
 457
 458         case OVS_SAMPLE_ATTR_UNSPEC:
 459         case __OVS_SAMPLE_ATTR_MAX:
 460         default:
 461             OVS_NOT_REACHED();
 462         }
 463     }
 464
 465     odp_execute_actions(dp, &packet, 1, steal, nl_attr_get(subactions),
 466                         nl_attr_get_size(subactions), dp_execute_action);
 467 }
 468
 469 void
 470 odp_execute_actions(void *dp, struct dp_packet **packets, int cnt, bool steal,
 471                     const struct nlattr *actions, size_t actions_len,
 472                     odp_execute_cb dp_execute_action)
 473 {
 474     const struct nlattr *a;
 475     unsigned int left;
 476     int i;
 477
 478     NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
 479         int type = nl_attr_type(a);
 480         bool last_action = (left <= NLA_ALIGN(a->nla_len));
 481
 482         switch ((enum ovs_action_attr) type) {
 483             /* These only make sense in the context of a datapath. */
 484         case OVS_ACTION_ATTR_OUTPUT:
 485         case OVS_ACTION_ATTR_TUNNEL_PUSH:
 486         case OVS_ACTION_ATTR_TUNNEL_POP:
 487         case OVS_ACTION_ATTR_USERSPACE:
 488         case OVS_ACTION_ATTR_RECIRC:
 489             if (dp_execute_action) {
 490                 /* Allow 'dp_execute_action' to steal the packet data if we do
 491                  * not need it any more. */
 492                 bool may_steal = steal && last_action;
 493
 494                 dp_execute_action(dp, packets, cnt, a, may_steal);
 495
 496                 if (last_action) {
 497                     /* We do not need to free the packets. dp_execute_actions()
 498                      * has stolen them */
 499                     return;
 500                 }
 501             }
 502             break;
 503
 504         case OVS_ACTION_ATTR_HASH: {
 505             const struct ovs_action_hash *hash_act = nl_attr_get(a);
 506
 507             /* Calculate a hash value directly.  This might not match the
 508              * value computed by the datapath, but it is much less expensive,
 509              * and the current use case (bonding) does not require a strict
 510              * match to work properly. */
 511             if (hash_act->hash_alg == OVS_HASH_ALG_L4) {
 512                 struct flow flow;
 513                 uint32_t hash;
 514
 515                 for (i = 0; i < cnt; i++) {
 516                     flow_extract(packets[i], &flow);
 517                     hash = flow_hash_5tuple(&flow, hash_act->hash_basis);
 518
 519                     /* We also store the hash value with each packet */
 520                     dp_packet_set_dp_hash(packets[i], hash ? hash : 1);
 521                 }
 522             } else {
 523                 /* Assert on unknown hash algorithm.  */
 524                 OVS_NOT_REACHED();
 525             }
 526             break;
 527         }
 528
 529         case OVS_ACTION_ATTR_PUSH_VLAN: {
 530             const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
 531
 532             for (i = 0; i < cnt; i++) {
 533                 eth_push_vlan(packets[i], htons(ETH_TYPE_VLAN), vlan->vlan_tci);
 534             }
 535             break;
 536         }
 537
 538         case OVS_ACTION_ATTR_POP_VLAN:
 539             for (i = 0; i < cnt; i++) {
 540                 eth_pop_vlan(packets[i]);
 541             }
 542             break;
 543
 544         case OVS_ACTION_ATTR_PUSH_MPLS: {
 545             const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
 546
 547             for (i = 0; i < cnt; i++) {
 548                 push_mpls(packets[i], mpls->mpls_ethertype, mpls->mpls_lse);
 549             }
 550             break;
 551          }
 552
 553         case OVS_ACTION_ATTR_POP_MPLS:
 554             for (i = 0; i < cnt; i++) {
 555                 pop_mpls(packets[i], nl_attr_get_be16(a));
 556             }
 557             break;
 558
 559         case OVS_ACTION_ATTR_SET:
 560             for (i = 0; i < cnt; i++) {
 561                 odp_execute_set_action(packets[i], nl_attr_get(a));
 562             }
 563             break;
 564
 565         case OVS_ACTION_ATTR_SET_MASKED:
 566             for (i = 0; i < cnt; i++) {
 567                 odp_execute_masked_set_action(packets[i], nl_attr_get(a));
 568             }
 569             break;
 570
 571         case OVS_ACTION_ATTR_SAMPLE:
 572             for (i = 0; i < cnt; i++) {
 573                 odp_execute_sample(dp, packets[i], steal && last_action, a,
 574                                    dp_execute_action);
 575             }
 576
 577             if (last_action) {
 578                 /* We do not need to free the packets. odp_execute_sample() has
 579                  * stolen them*/
 580                 return;
 581             }
 582             break;
 583
 584         case OVS_ACTION_ATTR_UNSPEC:
 585         case __OVS_ACTION_ATTR_MAX:
 586             OVS_NOT_REACHED();
 587         }
 588     }
 589
 590     if (steal) {
 591         for (i = 0; i < cnt; i++) {
 592             dp_packet_delete(packets[i]);
 593         }
 594     }
 595 }