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 #include "csum.h"
  37
  38 /* Masked copy of an ethernet address. 'src' is already properly masked. */
  39 static void
  40 ether_addr_copy_masked(struct eth_addr *dst, const struct eth_addr src,
  41                        const struct eth_addr mask)
  42 {
  43     int i;
  44
  45     for (i = 0; i < ARRAY_SIZE(dst->be16); i++) {
  46         dst->be16[i] = src.be16[i] | (dst->be16[i] & ~mask.be16[i]);
  47     }
  48 }
  49
  50 static void
  51 odp_eth_set_addrs(struct dp_packet *packet, const struct ovs_key_ethernet *key,
  52                   const struct ovs_key_ethernet *mask)
  53 {
  54     struct eth_header *eh = dp_packet_eth(packet);
  55
  56     if (eh) {
  57         if (!mask) {
  58             eh->eth_src = key->eth_src;
  59             eh->eth_dst = key->eth_dst;
  60         } else {
  61             ether_addr_copy_masked(&eh->eth_src, key->eth_src, mask->eth_src);
  62             ether_addr_copy_masked(&eh->eth_dst, key->eth_dst, mask->eth_dst);
  63         }
  64     }
  65 }
  66
  67 static void
  68 odp_set_ipv4(struct dp_packet *packet, const struct ovs_key_ipv4 *key,
  69              const struct ovs_key_ipv4 *mask)
  70 {
  71     struct ip_header *nh = dp_packet_l3(packet);
  72     ovs_be32 ip_src_nh;
  73     ovs_be32 ip_dst_nh;
  74     ovs_be32 new_ip_src;
  75     ovs_be32 new_ip_dst;
  76     uint8_t new_tos;
  77     uint8_t new_ttl;
  78
  79     if (mask->ipv4_src) {
  80         ip_src_nh = get_16aligned_be32(&nh->ip_src);
  81         new_ip_src = key->ipv4_src | (ip_src_nh & ~mask->ipv4_src);
  82
  83         if (ip_src_nh != new_ip_src) {
  84             packet_set_ipv4_addr(packet, &nh->ip_src, new_ip_src);
  85         }
  86     }
  87
  88     if (mask->ipv4_dst) {
  89         ip_dst_nh = get_16aligned_be32(&nh->ip_dst);
  90         new_ip_dst = key->ipv4_dst | (ip_dst_nh & ~mask->ipv4_dst);
  91
  92         if (ip_dst_nh != new_ip_dst) {
  93             packet_set_ipv4_addr(packet, &nh->ip_dst, new_ip_dst);
  94         }
  95     }
  96
  97     if (mask->ipv4_tos) {
  98         new_tos = key->ipv4_tos | (nh->ip_tos & ~mask->ipv4_tos);
  99
 100         if (nh->ip_tos != new_tos) {
 101             nh->ip_csum = recalc_csum16(nh->ip_csum,
 102                                         htons((uint16_t) nh->ip_tos),
 103                                         htons((uint16_t) new_tos));
 104             nh->ip_tos = new_tos;
 105         }
 106     }
 107
 108     if (OVS_LIKELY(mask->ipv4_ttl)) {
 109         new_ttl = key->ipv4_ttl | (nh->ip_ttl & ~mask->ipv4_ttl);
 110
 111         if (OVS_LIKELY(nh->ip_ttl != new_ttl)) {
 112             nh->ip_csum = recalc_csum16(nh->ip_csum, htons(nh->ip_ttl << 8),
 113                                         htons(new_ttl << 8));
 114             nh->ip_ttl = new_ttl;
 115         }
 116     }
 117 }
 118
 119 static struct in6_addr *
 120 mask_ipv6_addr(const ovs_16aligned_be32 *old, const struct in6_addr *addr,
 121                const struct in6_addr *mask, struct in6_addr *masked)
 122 {
 123 #ifdef s6_addr32
 124     for (int i = 0; i < 4; i++) {
 125         masked->s6_addr32[i] = addr->s6_addr32[i]
 126             | (get_16aligned_be32(&old[i]) & ~mask->s6_addr32[i]);
 127     }
 128 #else
 129     const uint8_t *old8 = (const uint8_t *)old;
 130     for (int i = 0; i < 16; i++) {
 131         masked->s6_addr[i] = addr->s6_addr[i] | (old8[i] & ~mask->s6_addr[i]);
 132     }
 133 #endif
 134     return masked;
 135 }
 136
 137 static void
 138 odp_set_ipv6(struct dp_packet *packet, const struct ovs_key_ipv6 *key,
 139              const struct ovs_key_ipv6 *mask)
 140 {
 141     struct ovs_16aligned_ip6_hdr *nh = dp_packet_l3(packet);
 142     struct in6_addr sbuf, dbuf;
 143     uint8_t old_tc = ntohl(get_16aligned_be32(&nh->ip6_flow)) >> 20;
 144     ovs_be32 old_fl = get_16aligned_be32(&nh->ip6_flow) & htonl(0xfffff);
 145
 146     packet_set_ipv6(
 147         packet,
 148         mask_ipv6_addr(nh->ip6_src.be32, &key->ipv6_src, &mask->ipv6_src,
 149                        &sbuf),
 150         mask_ipv6_addr(nh->ip6_dst.be32, &key->ipv6_dst, &mask->ipv6_dst,
 151                        &dbuf),
 152         key->ipv6_tclass | (old_tc & ~mask->ipv6_tclass),
 153         key->ipv6_label | (old_fl & ~mask->ipv6_label),
 154         key->ipv6_hlimit | (nh->ip6_hlim & ~mask->ipv6_hlimit));
 155 }
 156
 157 static void
 158 odp_set_tcp(struct dp_packet *packet, const struct ovs_key_tcp *key,
 159              const struct ovs_key_tcp *mask)
 160 {
 161     struct tcp_header *th = dp_packet_l4(packet);
 162
 163     if (OVS_LIKELY(th && dp_packet_get_tcp_payload(packet))) {
 164         packet_set_tcp_port(packet,
 165                             key->tcp_src | (th->tcp_src & ~mask->tcp_src),
 166                             key->tcp_dst | (th->tcp_dst & ~mask->tcp_dst));
 167     }
 168 }
 169
 170 static void
 171 odp_set_udp(struct dp_packet *packet, const struct ovs_key_udp *key,
 172              const struct ovs_key_udp *mask)
 173 {
 174     struct udp_header *uh = dp_packet_l4(packet);
 175
 176     if (OVS_LIKELY(uh && dp_packet_get_udp_payload(packet))) {
 177         packet_set_udp_port(packet,
 178                             key->udp_src | (uh->udp_src & ~mask->udp_src),
 179                             key->udp_dst | (uh->udp_dst & ~mask->udp_dst));
 180     }
 181 }
 182
 183 static void
 184 odp_set_sctp(struct dp_packet *packet, const struct ovs_key_sctp *key,
 185              const struct ovs_key_sctp *mask)
 186 {
 187     struct sctp_header *sh = dp_packet_l4(packet);
 188
 189     if (OVS_LIKELY(sh && dp_packet_get_sctp_payload(packet))) {
 190         packet_set_sctp_port(packet,
 191                              key->sctp_src | (sh->sctp_src & ~mask->sctp_src),
 192                              key->sctp_dst | (sh->sctp_dst & ~mask->sctp_dst));
 193     }
 194 }
 195
 196 static void
 197 odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
 198 {
 199     enum odp_key_fitness fitness;
 200
 201     fitness = odp_tun_key_from_attr(a, tun_key);
 202     ovs_assert(fitness != ODP_FIT_ERROR);
 203 }
 204
 205 static void
 206 set_arp(struct dp_packet *packet, const struct ovs_key_arp *key,
 207         const struct ovs_key_arp *mask)
 208 {
 209     struct arp_eth_header *arp = dp_packet_l3(packet);
 210
 211     if (!mask) {
 212         arp->ar_op = key->arp_op;
 213         arp->ar_sha = key->arp_sha;
 214         put_16aligned_be32(&arp->ar_spa, key->arp_sip);
 215         arp->ar_tha = key->arp_tha;
 216         put_16aligned_be32(&arp->ar_tpa, key->arp_tip);
 217     } else {
 218         ovs_be32 ar_spa = get_16aligned_be32(&arp->ar_spa);
 219         ovs_be32 ar_tpa = get_16aligned_be32(&arp->ar_tpa);
 220
 221         arp->ar_op = key->arp_op | (arp->ar_op & ~mask->arp_op);
 222         ether_addr_copy_masked(&arp->ar_sha, key->arp_sha, mask->arp_sha);
 223         put_16aligned_be32(&arp->ar_spa,
 224                            key->arp_sip | (ar_spa & ~mask->arp_sip));
 225         ether_addr_copy_masked(&arp->ar_tha, key->arp_tha, mask->arp_tha);
 226         put_16aligned_be32(&arp->ar_tpa,
 227                            key->arp_tip | (ar_tpa & ~mask->arp_tip));
 228     }
 229 }
 230
 231 static void
 232 odp_set_nd(struct dp_packet *packet, const struct ovs_key_nd *key,
 233            const struct ovs_key_nd *mask)
 234 {
 235     const struct ovs_nd_msg *ns = dp_packet_l4(packet);
 236     const struct ovs_nd_lla_opt *lla_opt = dp_packet_get_nd_payload(packet);
 237
 238     if (OVS_LIKELY(ns && lla_opt)) {
 239         int bytes_remain = dp_packet_l4_size(packet) - sizeof(*ns);
 240         struct in6_addr tgt_buf;
 241         struct eth_addr sll_buf = eth_addr_zero;
 242         struct eth_addr tll_buf = eth_addr_zero;
 243
 244         while (bytes_remain >= ND_LLA_OPT_LEN && lla_opt->len != 0) {
 245             if (lla_opt->type == ND_OPT_SOURCE_LINKADDR
 246                 && lla_opt->len == 1) {
 247                 sll_buf = lla_opt->mac;
 248                 ether_addr_copy_masked(&sll_buf, key->nd_sll, mask->nd_sll);
 249
 250                 /* A packet can only contain one SLL or TLL option */
 251                 break;
 252             } else if (lla_opt->type == ND_OPT_TARGET_LINKADDR
 253                        && lla_opt->len == 1) {
 254                 tll_buf = lla_opt->mac;
 255                 ether_addr_copy_masked(&tll_buf, key->nd_tll, mask->nd_tll);
 256
 257                 /* A packet can only contain one SLL or TLL option */
 258                 break;
 259             }
 260
 261             lla_opt += lla_opt->len;
 262             bytes_remain -= lla_opt->len * ND_LLA_OPT_LEN;
 263         }
 264
 265         packet_set_nd(packet,
 266                       mask_ipv6_addr(ns->target.be32, &key->nd_target,
 267                                      &mask->nd_target, &tgt_buf),
 268                       sll_buf,
 269                       tll_buf);
 270     }
 271 }
 272
 273 static void
 274 odp_execute_set_action(struct dp_packet *packet, const struct nlattr *a)
 275 {
 276     enum ovs_key_attr type = nl_attr_type(a);
 277     const struct ovs_key_ipv4 *ipv4_key;
 278     const struct ovs_key_ipv6 *ipv6_key;
 279     struct pkt_metadata *md = &packet->md;
 280
 281     switch (type) {
 282     case OVS_KEY_ATTR_PRIORITY:
 283         md->skb_priority = nl_attr_get_u32(a);
 284         break;
 285
 286     case OVS_KEY_ATTR_TUNNEL:
 287         odp_set_tunnel_action(a, &md->tunnel);
 288         break;
 289
 290     case OVS_KEY_ATTR_SKB_MARK:
 291         md->pkt_mark = nl_attr_get_u32(a);
 292         break;
 293
 294     case OVS_KEY_ATTR_ETHERNET:
 295         odp_eth_set_addrs(packet, nl_attr_get(a), NULL);
 296         break;
 297
 298     case OVS_KEY_ATTR_IPV4:
 299         ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
 300         packet_set_ipv4(packet, ipv4_key->ipv4_src,
 301                         ipv4_key->ipv4_dst, ipv4_key->ipv4_tos,
 302                         ipv4_key->ipv4_ttl);
 303         break;
 304
 305     case OVS_KEY_ATTR_IPV6:
 306         ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
 307         packet_set_ipv6(packet, &ipv6_key->ipv6_src, &ipv6_key->ipv6_dst,
 308                         ipv6_key->ipv6_tclass, ipv6_key->ipv6_label,
 309                         ipv6_key->ipv6_hlimit);
 310         break;
 311
 312     case OVS_KEY_ATTR_TCP:
 313         if (OVS_LIKELY(dp_packet_get_tcp_payload(packet))) {
 314             const struct ovs_key_tcp *tcp_key
 315                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
 316
 317             packet_set_tcp_port(packet, tcp_key->tcp_src,
 318                                 tcp_key->tcp_dst);
 319         }
 320         break;
 321
 322     case OVS_KEY_ATTR_UDP:
 323         if (OVS_LIKELY(dp_packet_get_udp_payload(packet))) {
 324             const struct ovs_key_udp *udp_key
 325                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
 326
 327             packet_set_udp_port(packet, udp_key->udp_src,
 328                                 udp_key->udp_dst);
 329         }
 330         break;
 331
 332     case OVS_KEY_ATTR_SCTP:
 333         if (OVS_LIKELY(dp_packet_get_sctp_payload(packet))) {
 334             const struct ovs_key_sctp *sctp_key
 335                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
 336
 337             packet_set_sctp_port(packet, sctp_key->sctp_src,
 338                                  sctp_key->sctp_dst);
 339         }
 340         break;
 341
 342     case OVS_KEY_ATTR_MPLS:
 343         set_mpls_lse(packet, nl_attr_get_be32(a));
 344         break;
 345
 346     case OVS_KEY_ATTR_ARP:
 347         set_arp(packet, nl_attr_get(a), NULL);
 348         break;
 349
 350     case OVS_KEY_ATTR_ICMP:
 351     case OVS_KEY_ATTR_ICMPV6:
 352         if (OVS_LIKELY(dp_packet_get_icmp_payload(packet))) {
 353             const struct ovs_key_icmp *icmp_key
 354                 = nl_attr_get_unspec(a, sizeof(struct ovs_key_icmp));
 355
 356             packet_set_icmp(packet, icmp_key->icmp_type, icmp_key->icmp_code);
 357         }
 358         break;
 359
 360     case OVS_KEY_ATTR_ND:
 361         if (OVS_LIKELY(dp_packet_get_nd_payload(packet))) {
 362             const struct ovs_key_nd *nd_key
 363                    = nl_attr_get_unspec(a, sizeof(struct ovs_key_nd));
 364             packet_set_nd(packet, &nd_key->nd_target, nd_key->nd_sll,
 365                           nd_key->nd_tll);
 366         }
 367         break;
 368
 369     case OVS_KEY_ATTR_DP_HASH:
 370         md->dp_hash = nl_attr_get_u32(a);
 371         break;
 372
 373     case OVS_KEY_ATTR_RECIRC_ID:
 374         md->recirc_id = nl_attr_get_u32(a);
 375         break;
 376
 377     case OVS_KEY_ATTR_UNSPEC:
 378     case OVS_KEY_ATTR_ENCAP:
 379     case OVS_KEY_ATTR_ETHERTYPE:
 380     case OVS_KEY_ATTR_IN_PORT:
 381     case OVS_KEY_ATTR_VLAN:
 382     case OVS_KEY_ATTR_TCP_FLAGS:
 383     case OVS_KEY_ATTR_CT_STATE:
 384     case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
 385     case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
 386     case OVS_KEY_ATTR_CT_ZONE:
 387     case OVS_KEY_ATTR_CT_MARK:
 388     case OVS_KEY_ATTR_CT_LABELS:
 389     case __OVS_KEY_ATTR_MAX:
 390     default:
 391         OVS_NOT_REACHED();
 392     }
 393 }
 394
 395 #define get_mask(a, type) ((const type *)(const void *)(a + 1) + 1)
 396
 397 static void
 398 odp_execute_masked_set_action(struct dp_packet *packet,
 399                               const struct nlattr *a)
 400 {
 401     struct pkt_metadata *md = &packet->md;
 402     enum ovs_key_attr type = nl_attr_type(a);
 403     struct mpls_hdr *mh;
 404
 405     switch (type) {
 406     case OVS_KEY_ATTR_PRIORITY:
 407         md->skb_priority = nl_attr_get_u32(a)
 408             | (md->skb_priority & ~*get_mask(a, uint32_t));
 409         break;
 410
 411     case OVS_KEY_ATTR_SKB_MARK:
 412         md->pkt_mark = nl_attr_get_u32(a)
 413             | (md->pkt_mark & ~*get_mask(a, uint32_t));
 414         break;
 415
 416     case OVS_KEY_ATTR_ETHERNET:
 417         odp_eth_set_addrs(packet, nl_attr_get(a),
 418                           get_mask(a, struct ovs_key_ethernet));
 419         break;
 420
 421     case OVS_KEY_ATTR_IPV4:
 422         odp_set_ipv4(packet, nl_attr_get(a),
 423                      get_mask(a, struct ovs_key_ipv4));
 424         break;
 425
 426     case OVS_KEY_ATTR_IPV6:
 427         odp_set_ipv6(packet, nl_attr_get(a),
 428                      get_mask(a, struct ovs_key_ipv6));
 429         break;
 430
 431     case OVS_KEY_ATTR_TCP:
 432         odp_set_tcp(packet, nl_attr_get(a),
 433                     get_mask(a, struct ovs_key_tcp));
 434         break;
 435
 436     case OVS_KEY_ATTR_UDP:
 437         odp_set_udp(packet, nl_attr_get(a),
 438                     get_mask(a, struct ovs_key_udp));
 439         break;
 440
 441     case OVS_KEY_ATTR_SCTP:
 442         odp_set_sctp(packet, nl_attr_get(a),
 443                      get_mask(a, struct ovs_key_sctp));
 444         break;
 445
 446     case OVS_KEY_ATTR_MPLS:
 447         mh = dp_packet_l2_5(packet);
 448         if (mh) {
 449             put_16aligned_be32(&mh->mpls_lse, nl_attr_get_be32(a)
 450                                | (get_16aligned_be32(&mh->mpls_lse)
 451                                   & ~*get_mask(a, ovs_be32)));
 452         }
 453         break;
 454
 455     case OVS_KEY_ATTR_ARP:
 456         set_arp(packet, nl_attr_get(a),
 457                 get_mask(a, struct ovs_key_arp));
 458         break;
 459
 460     case OVS_KEY_ATTR_ND:
 461         odp_set_nd(packet, nl_attr_get(a),
 462                    get_mask(a, struct ovs_key_nd));
 463         break;
 464
 465     case OVS_KEY_ATTR_DP_HASH:
 466         md->dp_hash = nl_attr_get_u32(a)
 467             | (md->dp_hash & ~*get_mask(a, uint32_t));
 468         break;
 469
 470     case OVS_KEY_ATTR_RECIRC_ID:
 471         md->recirc_id = nl_attr_get_u32(a)
 472             | (md->recirc_id & ~*get_mask(a, uint32_t));
 473         break;
 474
 475     case OVS_KEY_ATTR_TUNNEL:    /* Masked data not supported for tunnel. */
 476     case OVS_KEY_ATTR_UNSPEC:
 477     case OVS_KEY_ATTR_CT_STATE:
 478     case OVS_KEY_ATTR_CT_ZONE:
 479     case OVS_KEY_ATTR_CT_MARK:
 480     case OVS_KEY_ATTR_CT_LABELS:
 481     case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
 482     case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
 483     case OVS_KEY_ATTR_ENCAP:
 484     case OVS_KEY_ATTR_ETHERTYPE:
 485     case OVS_KEY_ATTR_IN_PORT:
 486     case OVS_KEY_ATTR_VLAN:
 487     case OVS_KEY_ATTR_ICMP:
 488     case OVS_KEY_ATTR_ICMPV6:
 489     case OVS_KEY_ATTR_TCP_FLAGS:
 490     case __OVS_KEY_ATTR_MAX:
 491     default:
 492         OVS_NOT_REACHED();
 493     }
 494 }
 495
 496 static void
 497 odp_execute_sample(void *dp, struct dp_packet *packet, bool steal,
 498                    const struct nlattr *action,
 499                    odp_execute_cb dp_execute_action)
 500 {
 501     const struct nlattr *subactions = NULL;
 502     const struct nlattr *a;
 503     struct dp_packet_batch pb;
 504     size_t left;
 505
 506     NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
 507         int type = nl_attr_type(a);
 508
 509         switch ((enum ovs_sample_attr) type) {
 510         case OVS_SAMPLE_ATTR_PROBABILITY:
 511             if (random_uint32() >= nl_attr_get_u32(a)) {
 512                 if (steal) {
 513                     dp_packet_delete(packet);
 514                 }
 515                 return;
 516             }
 517             break;
 518
 519         case OVS_SAMPLE_ATTR_ACTIONS:
 520             subactions = a;
 521             break;
 522
 523         case OVS_SAMPLE_ATTR_UNSPEC:
 524         case __OVS_SAMPLE_ATTR_MAX:
 525         default:
 526             OVS_NOT_REACHED();
 527         }
 528     }
 529
 530     if (!steal) {
 531         /* The 'subactions' may modify the packet, but the modification
 532          * should not propagate beyond this sample action. Make a copy
 533          * the packet in case we don't own the packet, so that the
 534          * 'subactions' are only applid to the clone.  'odp_execute_actions'
 535          * will free the clone.  */
 536         packet = dp_packet_clone(packet);
 537     }
 538     dp_packet_batch_init_packet(&pb, packet);
 539     odp_execute_actions(dp, &pb, true, nl_attr_get(subactions),
 540                         nl_attr_get_size(subactions), dp_execute_action);
 541 }
 542
 543 static void
 544 odp_execute_clone(void *dp, struct dp_packet_batch *batch, bool steal,
 545                    const struct nlattr *actions,
 546                    odp_execute_cb dp_execute_action)
 547 {
 548     if (!steal) {
 549         /* The 'actions' may modify the packet, but the modification
 550          * should not propagate beyond this clone action. Make a copy
 551          * the packet in case we don't own the packet, so that the
 552          * 'actions' are only applied to the clone.  'odp_execute_actions'
 553          * will free the clone.  */
 554         struct dp_packet_batch clone_pkt_batch;
 555         dp_packet_batch_clone(&clone_pkt_batch, batch);
 556         dp_packet_batch_reset_cutlen(batch);
 557         odp_execute_actions(dp, &clone_pkt_batch, true, nl_attr_get(actions),
 558                         nl_attr_get_size(actions), dp_execute_action);
 559     }
 560     else {
 561         odp_execute_actions(dp, batch, true, nl_attr_get(actions),
 562                             nl_attr_get_size(actions), dp_execute_action);
 563     }
 564 }
 565
 566 static bool
 567 requires_datapath_assistance(const struct nlattr *a)
 568 {
 569     enum ovs_action_attr type = nl_attr_type(a);
 570
 571     switch (type) {
 572         /* These only make sense in the context of a datapath. */
 573     case OVS_ACTION_ATTR_OUTPUT:
 574     case OVS_ACTION_ATTR_TUNNEL_PUSH:
 575     case OVS_ACTION_ATTR_TUNNEL_POP:
 576     case OVS_ACTION_ATTR_USERSPACE:
 577     case OVS_ACTION_ATTR_RECIRC:
 578     case OVS_ACTION_ATTR_CT:
 579     case OVS_ACTION_ATTR_METER:
 580         return true;
 581
 582     case OVS_ACTION_ATTR_SET:
 583     case OVS_ACTION_ATTR_SET_MASKED:
 584     case OVS_ACTION_ATTR_PUSH_VLAN:
 585     case OVS_ACTION_ATTR_POP_VLAN:
 586     case OVS_ACTION_ATTR_SAMPLE:
 587     case OVS_ACTION_ATTR_HASH:
 588     case OVS_ACTION_ATTR_PUSH_MPLS:
 589     case OVS_ACTION_ATTR_POP_MPLS:
 590     case OVS_ACTION_ATTR_TRUNC:
 591     case OVS_ACTION_ATTR_PUSH_ETH:
 592     case OVS_ACTION_ATTR_POP_ETH:
 593     case OVS_ACTION_ATTR_CLONE:
 594         return false;
 595
 596     case OVS_ACTION_ATTR_UNSPEC:
 597     case __OVS_ACTION_ATTR_MAX:
 598         OVS_NOT_REACHED();
 599     }
 600
 601     return false;
 602 }
 603
 604 void
 605 odp_execute_actions(void *dp, struct dp_packet_batch *batch, bool steal,
 606                     const struct nlattr *actions, size_t actions_len,
 607                     odp_execute_cb dp_execute_action)
 608 {
 609     struct dp_packet *packet;
 610     const struct nlattr *a;
 611     unsigned int left;
 612
 613     NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
 614         int type = nl_attr_type(a);
 615         bool last_action = (left <= NLA_ALIGN(a->nla_len));
 616
 617         if (requires_datapath_assistance(a)) {
 618             if (dp_execute_action) {
 619                 /* Allow 'dp_execute_action' to steal the packet data if we do
 620                  * not need it any more. */
 621                 bool may_steal = steal && last_action;
 622
 623                 dp_execute_action(dp, batch, a, may_steal);
 624
 625                 if (last_action) {
 626                     /* We do not need to free the packets. dp_execute_actions()
 627                      * has stolen them */
 628                     return;
 629                 }
 630             }
 631             continue;
 632         }
 633
 634         switch ((enum ovs_action_attr) type) {
 635         case OVS_ACTION_ATTR_HASH: {
 636             const struct ovs_action_hash *hash_act = nl_attr_get(a);
 637
 638             /* Calculate a hash value directly.  This might not match the
 639              * value computed by the datapath, but it is much less expensive,
 640              * and the current use case (bonding) does not require a strict
 641              * match to work properly. */
 642             if (hash_act->hash_alg == OVS_HASH_ALG_L4) {
 643                 struct flow flow;
 644                 uint32_t hash;
 645
 646                 DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 647                     flow_extract(packet, &flow);
 648                     hash = flow_hash_5tuple(&flow, hash_act->hash_basis);
 649                     packet->md.dp_hash = hash;
 650                 }
 651             } else {
 652                 /* Assert on unknown hash algorithm.  */
 653                 OVS_NOT_REACHED();
 654             }
 655             break;
 656         }
 657
 658         case OVS_ACTION_ATTR_PUSH_VLAN: {
 659             const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
 660
 661             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 662                 eth_push_vlan(packet, vlan->vlan_tpid, vlan->vlan_tci);
 663             }
 664             break;
 665         }
 666
 667         case OVS_ACTION_ATTR_POP_VLAN:
 668             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 669                 eth_pop_vlan(packet);
 670             }
 671             break;
 672
 673         case OVS_ACTION_ATTR_PUSH_MPLS: {
 674             const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
 675
 676             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 677                 push_mpls(packet, mpls->mpls_ethertype, mpls->mpls_lse);
 678             }
 679             break;
 680          }
 681
 682         case OVS_ACTION_ATTR_POP_MPLS:
 683             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 684                 pop_mpls(packet, nl_attr_get_be16(a));
 685             }
 686             break;
 687
 688         case OVS_ACTION_ATTR_SET:
 689             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 690                 odp_execute_set_action(packet, nl_attr_get(a));
 691             }
 692             break;
 693
 694         case OVS_ACTION_ATTR_SET_MASKED:
 695             DP_PACKET_BATCH_FOR_EACH(packet, batch) {
 696                 odp_execute_masked_set_action(packet, nl_attr_get(a));
 697             }
 698             break;
 699
 700         case OVS_ACTION_ATTR_SAMPLE:
 701             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 702                 odp_execute_sample(dp, packet, steal && last_action, a,
 703                                    dp_execute_action);
 704             }
 705
 706             if (last_action) {
 707                 /* We do not need to free the packets. odp_execute_sample() has
 708                  * stolen them*/
 709                 return;
 710             }
 711             break;
 712
 713         case OVS_ACTION_ATTR_TRUNC: {
 714             const struct ovs_action_trunc *trunc =
 715                         nl_attr_get_unspec(a, sizeof *trunc);
 716
 717             batch->trunc = true;
 718             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 719                 dp_packet_set_cutlen(packet, trunc->max_len);
 720             }
 721             break;
 722         }
 723
 724         case OVS_ACTION_ATTR_CLONE:
 725             odp_execute_clone(dp, batch, steal && last_action, a,
 726                                                 dp_execute_action);
 727             if (last_action) {
 728                 /* We do not need to free the packets. odp_execute_clone() has
 729                  * stolen them.  */
 730                 return;
 731             }
 732         case OVS_ACTION_ATTR_METER:
 733             /* Not implemented yet. */
 734             break;
 735         case OVS_ACTION_ATTR_PUSH_ETH: {
 736             const struct ovs_action_push_eth *eth = nl_attr_get(a);
 737
 738             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 739                 push_eth(packet, &eth->addresses.eth_dst,
 740                          &eth->addresses.eth_src);
 741             }
 742             break;
 743         }
 744
 745         case OVS_ACTION_ATTR_POP_ETH:
 746             DP_PACKET_BATCH_FOR_EACH (packet, batch) {
 747                 pop_eth(packet);
 748             }
 749             break;
 750
 751         case OVS_ACTION_ATTR_OUTPUT:
 752         case OVS_ACTION_ATTR_TUNNEL_PUSH:
 753         case OVS_ACTION_ATTR_TUNNEL_POP:
 754         case OVS_ACTION_ATTR_USERSPACE:
 755         case OVS_ACTION_ATTR_RECIRC:
 756         case OVS_ACTION_ATTR_CT:
 757         case OVS_ACTION_ATTR_UNSPEC:
 758         case __OVS_ACTION_ATTR_MAX:
 759             OVS_NOT_REACHED();
 760         }
 761     }
 762
 763     dp_packet_delete_batch(batch, steal);
 764 }