text: /*
   * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <config.h>
  #include <arpa/inet.h>
  #include "odp-util.h"
  #include <errno.h>
  #include <inttypes.h>
  #include <math.h>
  #include <netinet/in.h>
  #include <netinet/icmp6.h>
  #include <stdlib.h>
  #include <string.h>
  #include "byte-order.h"
  #include "coverage.h"
  #include "dynamic-string.h"
  #include "flow.h"
  #include "netlink.h"
  #include "ofpbuf.h"
  #include "packets.h"
  #include "simap.h"
  #include "timeval.h"
  #include "util.h"
  #include "vlog.h"
  
  VLOG_DEFINE_THIS_MODULE(odp_util);
  
  /* The interface between userspace and kernel uses an "OVS_*" prefix.
   * Since this is fairly non-specific for the OVS userspace components,
   * "ODP_*" (Open vSwitch Datapath) is used as the prefix for
   * interactions with the datapath.
   */
  
  /* The set of characters that may separate one action or one key attribute
   * from another. */
  static const char *delimiters = ", \t\r\n";
  
  static int parse_odp_key_mask_attr(const char *, const struct simap *port_names,
                                struct ofpbuf *, struct ofpbuf *);
  static void format_odp_key_attr(const struct nlattr *a,
                                  const struct nlattr *ma, struct ds *ds,
                                  bool verbose);
  
  /* Returns one the following for the action with the given OVS_ACTION_ATTR_*
   * 'type':
   *
   *   - For an action whose argument has a fixed length, returned that
   *     nonnegative length in bytes.
   *
   *   - For an action with a variable-length argument, returns -2.
   *
   *   - For an invalid 'type', returns -1. */
  static int
  odp_action_len(uint16_t type)
  {
      if (type > OVS_ACTION_ATTR_MAX) {
          return -1;
      }
  
      switch ((enum ovs_action_attr) type) {
      case OVS_ACTION_ATTR_OUTPUT: return sizeof(uint32_t);
      case OVS_ACTION_ATTR_USERSPACE: return -2;
      case OVS_ACTION_ATTR_PUSH_VLAN: return sizeof(struct ovs_action_push_vlan);
      case OVS_ACTION_ATTR_POP_VLAN: return 0;
      case OVS_ACTION_ATTR_PUSH_MPLS: return sizeof(struct ovs_action_push_mpls);
      case OVS_ACTION_ATTR_POP_MPLS: return sizeof(ovs_be16);
      case OVS_ACTION_ATTR_SET: return -2;
      case OVS_ACTION_ATTR_SAMPLE: return -2;
  
      case OVS_ACTION_ATTR_UNSPEC:
      case __OVS_ACTION_ATTR_MAX:
          return -1;
      }
  
      return -1;
  }
  
  /* Returns a string form of 'attr'.  The return value is either a statically
   * allocated constant string or the 'bufsize'-byte buffer 'namebuf'.  'bufsize'
   * should be at least OVS_KEY_ATTR_BUFSIZE. */
  enum { OVS_KEY_ATTR_BUFSIZE = 3 + INT_STRLEN(unsigned int) + 1 };
  static const char *
  ovs_key_attr_to_string(enum ovs_key_attr attr, char *namebuf, size_t bufsize)
  {
      switch (attr) {
      case OVS_KEY_ATTR_UNSPEC: return "unspec";
      case OVS_KEY_ATTR_ENCAP: return "encap";
      case OVS_KEY_ATTR_PRIORITY: return "skb_priority";
      case OVS_KEY_ATTR_SKB_MARK: return "skb_mark";
      case OVS_KEY_ATTR_TUNNEL: return "tunnel";
      case OVS_KEY_ATTR_IN_PORT: return "in_port";
      case OVS_KEY_ATTR_ETHERNET: return "eth";
      case OVS_KEY_ATTR_VLAN: return "vlan";
      case OVS_KEY_ATTR_ETHERTYPE: return "eth_type";
      case OVS_KEY_ATTR_IPV4: return "ipv4";
      case OVS_KEY_ATTR_IPV6: return "ipv6";
      case OVS_KEY_ATTR_TCP: return "tcp";
      case OVS_KEY_ATTR_UDP: return "udp";
      case OVS_KEY_ATTR_SCTP: return "sctp";
      case OVS_KEY_ATTR_ICMP: return "icmp";
      case OVS_KEY_ATTR_ICMPV6: return "icmpv6";
      case OVS_KEY_ATTR_ARP: return "arp";
      case OVS_KEY_ATTR_ND: return "nd";
      case OVS_KEY_ATTR_MPLS: return "mpls";
  
      case __OVS_KEY_ATTR_MAX:
      default:
          snprintf(namebuf, bufsize, "key%u", (unsigned int) attr);
          return namebuf;
      }
  }
  
  static void
  format_generic_odp_action(struct ds *ds, const struct nlattr *a)
  {
      size_t len = nl_attr_get_size(a);
  
      ds_put_format(ds, "action%"PRId16, nl_attr_type(a));
      if (len) {
          const uint8_t *unspec;
          unsigned int i;
  
          unspec = nl_attr_get(a);
          for (i = 0; i < len; i++) {
              ds_put_char(ds, i ? ' ': '(');
              ds_put_format(ds, "%02x", unspec[i]);
          }
          ds_put_char(ds, ')');
      }
  }
  
  static void
  format_odp_sample_action(struct ds *ds, const struct nlattr *attr)
  {
      static const struct nl_policy ovs_sample_policy[] = {
          { NL_A_NO_ATTR, 0, 0, false }, /* OVS_SAMPLE_ATTR_UNSPEC */
          { NL_A_U32, 0, 0, false },     /* OVS_SAMPLE_ATTR_PROBABILITY */
          { NL_A_NESTED, 0, 0, false },  /* OVS_SAMPLE_ATTR_ACTIONS */
      };
      struct nlattr *a[ARRAY_SIZE(ovs_sample_policy)];
      double percentage;
      const struct nlattr *nla_acts;
      int len;
  
      ds_put_cstr(ds, "sample");
  
      if (!nl_parse_nested(attr, ovs_sample_policy, a, ARRAY_SIZE(a))) {
          ds_put_cstr(ds, "(error)");
          return;
      }
  
      percentage = (100.0 * nl_attr_get_u32(a[OVS_SAMPLE_ATTR_PROBABILITY])) /
                          UINT32_MAX;
  
      ds_put_format(ds, "(sample=%.1f%%,", percentage);
  
      ds_put_cstr(ds, "actions(");
      nla_acts = nl_attr_get(a[OVS_SAMPLE_ATTR_ACTIONS]);
      len = nl_attr_get_size(a[OVS_SAMPLE_ATTR_ACTIONS]);
      format_odp_actions(ds, nla_acts, len);
      ds_put_format(ds, "))");
  }
  
  static const char *
  slow_path_reason_to_string(enum slow_path_reason reason)
  {
      switch (reason) {
      case SLOW_CFM:
          return "cfm";
      case SLOW_LACP:
          return "lacp";
      case SLOW_STP:
          return "stp";
      case SLOW_BFD:
          return "bfd";
      case SLOW_CONTROLLER:
          return "controller";
      case __SLOW_MAX:
      default:
          return NULL;
      }
  }
  
  static enum slow_path_reason
  string_to_slow_path_reason(const char *string)
  {
      enum slow_path_reason i;
  
      for (i = 1; i < __SLOW_MAX; i++) {
          if (!strcmp(string, slow_path_reason_to_string(i))) {
              return i;
          }
      }
  
      return 0;
  }
  
  static int
  parse_flags(const char *s, const char *(*bit_to_string)(uint32_t),
              uint32_t *res)
  {
      uint32_t result = 0;
      int n = 0;
  
      if (s[n] != '(') {
          return -EINVAL;
      }
      n++;
  
      while (s[n] != ')') {
          unsigned long long int flags;
          uint32_t bit;
          int n0;
  
          if (sscanf(&s[n], "%lli%n", &flags, &n0) > 0 && n0 > 0) {
              n += n0 + (s[n + n0] == ',');
              result |= flags;
              continue;
          }
  
          for (bit = 1; bit; bit <<= 1) {
              const char *name = bit_to_string(bit);
              size_t len;
  
              if (!name) {
                  continue;
              }
  
              len = strlen(name);
              if (!strncmp(s + n, name, len) &&
                  (s[n + len] == ',' || s[n + len] == ')')) {
                  result |= bit;
                  n += len + (s[n + len] == ',');
                  break;
              }
          }
  
          if (!bit) {
              return -EINVAL;
          }
      }
      n++;
  
      *res = result;
      return n;
  }
  
  static void
  format_odp_userspace_action(struct ds *ds, const struct nlattr *attr)
  {
      static const struct nl_policy ovs_userspace_policy[] = {
          { NL_A_NO_ATTR, 0, 0, false }, /* OVS_USERSPACE_ATTR_UNSPEC */
          { NL_A_U32, 0, 0, false },     /* OVS_USERSPACE_ATTR_PID */
          { NL_A_UNSPEC, 0, 0, true },   /* OVS_USERSPACE_ATTR_USERDATA */
      };
      struct nlattr *a[ARRAY_SIZE(ovs_userspace_policy)];
      const struct nlattr *userdata_attr;
  
      if (!nl_parse_nested(attr, ovs_userspace_policy, a, ARRAY_SIZE(a))) {
          ds_put_cstr(ds, "userspace(error)");
          return;
      }
  
      ds_put_format(ds, "userspace(pid=%"PRIu32,
                    nl_attr_get_u32(a[OVS_USERSPACE_ATTR_PID]));
  
      userdata_attr = a[OVS_USERSPACE_ATTR_USERDATA];
  
      if (userdata_attr) {
          const uint8_t *userdata = nl_attr_get(userdata_attr);
          size_t userdata_len = nl_attr_get_size(userdata_attr);
          bool userdata_unspec = true;
          union user_action_cookie cookie;
  
          if (userdata_len >= sizeof cookie.type
              && userdata_len <= sizeof cookie) {
  
              memset(&cookie, 0, sizeof cookie);
              memcpy(&cookie, userdata, userdata_len);
  
              userdata_unspec = false;
  
              if (userdata_len == sizeof cookie.sflow
                  && cookie.type == USER_ACTION_COOKIE_SFLOW) {
                  ds_put_format(ds, ",sFlow("
                                "vid=%"PRIu16",pcp=%"PRIu8",output=%"PRIu32")",
                                vlan_tci_to_vid(cookie.sflow.vlan_tci),
                                vlan_tci_to_pcp(cookie.sflow.vlan_tci),
                                cookie.sflow.output);
              } else if (userdata_len == sizeof cookie.slow_path
                         && cookie.type == USER_ACTION_COOKIE_SLOW_PATH) {
                  const char *reason;
                  reason = slow_path_reason_to_string(cookie.slow_path.reason);
                  reason = reason ? reason : "";
                  ds_put_format(ds, ",slow_path(%s)", reason);
              } else if (userdata_len == sizeof cookie.flow_sample
                         && cookie.type == USER_ACTION_COOKIE_FLOW_SAMPLE) {
                  ds_put_format(ds, ",flow_sample(probability=%"PRIu16
                                ",collector_set_id=%"PRIu32
                                ",obs_domain_id=%"PRIu32
                                ",obs_point_id=%"PRIu32")",
                                cookie.flow_sample.probability,
                                cookie.flow_sample.collector_set_id,
                                cookie.flow_sample.obs_domain_id,
                                cookie.flow_sample.obs_point_id);
              } else if (userdata_len == sizeof cookie.ipfix
                         && cookie.type == USER_ACTION_COOKIE_IPFIX) {
                  ds_put_format(ds, ",ipfix");
              } else {
                  userdata_unspec = true;
              }
          }
  
          if (userdata_unspec) {
              size_t i;
              ds_put_format(ds, ",userdata(");
              for (i = 0; i < userdata_len; i++) {
                  ds_put_format(ds, "%02x", userdata[i]);
              }
              ds_put_char(ds, ')');
          }
      }
  
      ds_put_char(ds, ')');
  }
  
  static void
  format_vlan_tci(struct ds *ds, ovs_be16 vlan_tci)
  {
      ds_put_format(ds, "vid=%"PRIu16",pcp=%d",
                    vlan_tci_to_vid(vlan_tci),
                    vlan_tci_to_pcp(vlan_tci));
      if (!(vlan_tci & htons(VLAN_CFI))) {
          ds_put_cstr(ds, ",cfi=0");
      }
  }
  
  static void
  format_mpls_lse(struct ds *ds, ovs_be32 mpls_lse)
  {
      ds_put_format(ds, "label=%"PRIu32",tc=%d,ttl=%d,bos=%d",
                    mpls_lse_to_label(mpls_lse),
                    mpls_lse_to_tc(mpls_lse),
                    mpls_lse_to_ttl(mpls_lse),
                    mpls_lse_to_bos(mpls_lse));
  }
  
  static void
  format_mpls(struct ds *ds, const struct ovs_key_mpls *mpls_key,
              const struct ovs_key_mpls *mpls_mask)
  {
      ovs_be32 key = mpls_key->mpls_lse;
  
      if (mpls_mask == NULL) {
          format_mpls_lse(ds, key);
      } else {
          ovs_be32 mask = mpls_mask->mpls_lse;
  
          ds_put_format(ds, "label=%"PRIu32"/0x%x,tc=%d/%x,ttl=%d/0x%x,bos=%d/%x",
                    mpls_lse_to_label(key), mpls_lse_to_label(mask),
                    mpls_lse_to_tc(key), mpls_lse_to_tc(mask),
                    mpls_lse_to_ttl(key), mpls_lse_to_ttl(mask),
                    mpls_lse_to_bos(key), mpls_lse_to_bos(mask));
      }
  }
  
  static void
  format_odp_action(struct ds *ds, const struct nlattr *a)
  {
      int expected_len;
      enum ovs_action_attr type = nl_attr_type(a);
      const struct ovs_action_push_vlan *vlan;
  
      expected_len = odp_action_len(nl_attr_type(a));
      if (expected_len != -2 && nl_attr_get_size(a) != expected_len) {
          ds_put_format(ds, "bad length %zu, expected %d for: ",
                        nl_attr_get_size(a), expected_len);
          format_generic_odp_action(ds, a);
          return;
      }
  
      switch (type) {
      case OVS_ACTION_ATTR_OUTPUT:
          ds_put_format(ds, "%"PRIu32, nl_attr_get_u32(a));
          break;
      case OVS_ACTION_ATTR_USERSPACE:
          format_odp_userspace_action(ds, a);
          break;
      case OVS_ACTION_ATTR_SET:
          ds_put_cstr(ds, "set(");
          format_odp_key_attr(nl_attr_get(a), NULL, ds, true);
          ds_put_cstr(ds, ")");
          break;
      case OVS_ACTION_ATTR_PUSH_VLAN:
          vlan = nl_attr_get(a);
          ds_put_cstr(ds, "push_vlan(");
          if (vlan->vlan_tpid != htons(ETH_TYPE_VLAN)) {
              ds_put_format(ds, "tpid=0x%04"PRIx16",", ntohs(vlan->vlan_tpid));
          }
          format_vlan_tci(ds, vlan->vlan_tci);
          ds_put_char(ds, ')');
          break;
      case OVS_ACTION_ATTR_POP_VLAN:
          ds_put_cstr(ds, "pop_vlan");
          break;
      case OVS_ACTION_ATTR_PUSH_MPLS: {
          const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
          ds_put_cstr(ds, "push_mpls(");
          format_mpls_lse(ds, mpls->mpls_lse);
          ds_put_format(ds, ",eth_type=0x%"PRIx16")", ntohs(mpls->mpls_ethertype));
          break;
      }
      case OVS_ACTION_ATTR_POP_MPLS: {
          ovs_be16 ethertype = nl_attr_get_be16(a);
          ds_put_format(ds, "pop_mpls(eth_type=0x%"PRIx16")", ntohs(ethertype));
          break;
      }
      case OVS_ACTION_ATTR_SAMPLE:
          format_odp_sample_action(ds, a);
          break;
      case OVS_ACTION_ATTR_UNSPEC:
      case __OVS_ACTION_ATTR_MAX:
      default:
          format_generic_odp_action(ds, a);
          break;
      }
  }
  
  void
  format_odp_actions(struct ds *ds, const struct nlattr *actions,
                     size_t actions_len)
  {
      if (actions_len) {
          const struct nlattr *a;
          unsigned int left;
  
          NL_ATTR_FOR_EACH (a, left, actions, actions_len) {
              if (a != actions) {
                  ds_put_char(ds, ',');
              }
              format_odp_action(ds, a);
          }
          if (left) {
              int i;
  
              if (left == actions_len) {
                  ds_put_cstr(ds, "<empty>");
              }
              ds_put_format(ds, ",***%u leftover bytes*** (", left);
              for (i = 0; i < left; i++) {
                  ds_put_format(ds, "%02x", ((const uint8_t *) a)[i]);
              }
              ds_put_char(ds, ')');
          }
      } else {
          ds_put_cstr(ds, "drop");
      }
  }
  
  static int
  parse_odp_action(const char *s, const struct simap *port_names,
                   struct ofpbuf *actions)
  {
      /* Many of the sscanf calls in this function use oversized destination
       * fields because some sscanf() implementations truncate the range of %i
       * directives, so that e.g. "%"SCNi16 interprets input of "0xfedc" as a
       * value of 0x7fff.  The other alternatives are to allow only a single
       * radix (e.g. decimal or hexadecimal) or to write more sophisticated
       * parsers.
       *
       * The tun_id parser has to use an alternative approach because there is no
       * type larger than 64 bits. */
  
      {
          unsigned long long int port;
          int n = -1;
  
          if (sscanf(s, "%lli%n", &port, &n) > 0 && n > 0) {
              nl_msg_put_u32(actions, OVS_ACTION_ATTR_OUTPUT, port);
              return n;
          }
      }
  
      if (port_names) {
          int len = strcspn(s, delimiters);
          struct simap_node *node;
  
          node = simap_find_len(port_names, s, len);
          if (node) {
              nl_msg_put_u32(actions, OVS_ACTION_ATTR_OUTPUT, node->data);
              return len;
          }
      }
  
      {
          unsigned long long int pid;
          unsigned long long int output;
          unsigned long long int probability;
          unsigned long long int collector_set_id;
          unsigned long long int obs_domain_id;
          unsigned long long int obs_point_id;
          int vid, pcp;
          int n = -1;
  
          if (sscanf(s, "userspace(pid=%lli)%n", &pid, &n) > 0 && n > 0) {
              odp_put_userspace_action(pid, NULL, 0, actions);
              return n;
          } else if (sscanf(s, "userspace(pid=%lli,sFlow(vid=%i,"
                            "pcp=%i,output=%lli))%n",
                            &pid, &vid, &pcp, &output, &n) > 0 && n > 0) {
              union user_action_cookie cookie;
              uint16_t tci;
  
              tci = vid | (pcp << VLAN_PCP_SHIFT);
              if (tci) {
                  tci |= VLAN_CFI;
              }
  
              cookie.type = USER_ACTION_COOKIE_SFLOW;
              cookie.sflow.vlan_tci = htons(tci);
              cookie.sflow.output = output;
              odp_put_userspace_action(pid, &cookie, sizeof cookie.sflow,
                                       actions);
              return n;
          } else if (sscanf(s, "userspace(pid=%lli,slow_path(%n", &pid, &n) > 0
                     && n > 0) {
              union user_action_cookie cookie;
              char reason[32];
  
              if (s[n] == ')' && s[n + 1] == ')') {
                  reason[0] = '\0';
                  n += 2;
              } else if (sscanf(s + n, "%31[^)]))", reason) > 0) {
                  n += strlen(reason) + 2;
              } else {
                  return -EINVAL;
              }
  
              cookie.type = USER_ACTION_COOKIE_SLOW_PATH;
              cookie.slow_path.unused = 0;
              cookie.slow_path.reason = string_to_slow_path_reason(reason);
  
              if (reason[0] && !cookie.slow_path.reason) {
                  return -EINVAL;
              }
  
              odp_put_userspace_action(pid, &cookie, sizeof cookie.slow_path,
                                       actions);
              return n;
          } else if (sscanf(s, "userspace(pid=%lli,flow_sample(probability=%lli,"
                            "collector_set_id=%lli,obs_domain_id=%lli,"
                            "obs_point_id=%lli))%n",
                            &pid, &probability, &collector_set_id,
                            &obs_domain_id, &obs_point_id, &n) > 0 && n > 0) {
              union user_action_cookie cookie;
  
              cookie.type = USER_ACTION_COOKIE_FLOW_SAMPLE;
              cookie.flow_sample.probability = probability;
              cookie.flow_sample.collector_set_id = collector_set_id;
              cookie.flow_sample.obs_domain_id = obs_domain_id;
              cookie.flow_sample.obs_point_id = obs_point_id;
              odp_put_userspace_action(pid, &cookie, sizeof cookie.flow_sample,
                                       actions);
              return n;
          } else if (sscanf(s, "userspace(pid=%lli,ipfix)%n", &pid, &n) > 0
                     && n > 0) {
              union user_action_cookie cookie;
  
              cookie.type = USER_ACTION_COOKIE_IPFIX;
              odp_put_userspace_action(pid, &cookie, sizeof cookie.ipfix,
                                       actions);
              return n;
          } else if (sscanf(s, "userspace(pid=%lli,userdata(%n", &pid, &n) > 0
                     && n > 0) {
              struct ofpbuf buf;
              char *end;
  
              ofpbuf_init(&buf, 16);
              end = ofpbuf_put_hex(&buf, &s[n], NULL);
              if (end[0] == ')' && end[1] == ')') {
                  odp_put_userspace_action(pid, buf.data, buf.size, actions);
                  ofpbuf_uninit(&buf);
                  return (end + 2) - s;
              }
          }
      }
  
      if (!strncmp(s, "set(", 4)) {
          size_t start_ofs;
          int retval;
  
          start_ofs = nl_msg_start_nested(actions, OVS_ACTION_ATTR_SET);
          retval = parse_odp_key_mask_attr(s + 4, port_names, actions, NULL);
          if (retval < 0) {
              return retval;
          }
          if (s[retval + 4] != ')') {
              return -EINVAL;
          }
          nl_msg_end_nested(actions, start_ofs);
          return retval + 5;
      }
  
      {
          struct ovs_action_push_vlan push;
          int tpid = ETH_TYPE_VLAN;
          int vid, pcp;
          int cfi = 1;
          int n = -1;
  
          if ((sscanf(s, "push_vlan(vid=%i,pcp=%i)%n", &vid, &pcp, &n) > 0
               && n > 0)
              || (sscanf(s, "push_vlan(vid=%i,pcp=%i,cfi=%i)%n",
                         &vid, &pcp, &cfi, &n) > 0 && n > 0)
              || (sscanf(s, "push_vlan(tpid=%i,vid=%i,pcp=%i)%n",
                         &tpid, &vid, &pcp, &n) > 0 && n > 0)
              || (sscanf(s, "push_vlan(tpid=%i,vid=%i,pcp=%i,cfi=%i)%n",
                         &tpid, &vid, &pcp, &cfi, &n) > 0 && n > 0)) {
              push.vlan_tpid = htons(tpid);
              push.vlan_tci = htons((vid << VLAN_VID_SHIFT)
                                    | (pcp << VLAN_PCP_SHIFT)
                                    | (cfi ? VLAN_CFI : 0));
              nl_msg_put_unspec(actions, OVS_ACTION_ATTR_PUSH_VLAN,
                                &push, sizeof push);
  
              return n;
          }
      }
  
      if (!strncmp(s, "pop_vlan", 8)) {
          nl_msg_put_flag(actions, OVS_ACTION_ATTR_POP_VLAN);
          return 8;
      }
  
      {
          double percentage;
          int n = -1;
  
          if (sscanf(s, "sample(sample=%lf%%,actions(%n", &percentage, &n) > 0
              && percentage >= 0. && percentage <= 100.0
              && n > 0) {
              size_t sample_ofs, actions_ofs;
              double probability;
  
              probability = floor(UINT32_MAX * (percentage / 100.0) + .5);
              sample_ofs = nl_msg_start_nested(actions, OVS_ACTION_ATTR_SAMPLE);
              nl_msg_put_u32(actions, OVS_SAMPLE_ATTR_PROBABILITY,
                             (probability <= 0 ? 0
                              : probability >= UINT32_MAX ? UINT32_MAX
                              : probability));
  
              actions_ofs = nl_msg_start_nested(actions,
                                                OVS_SAMPLE_ATTR_ACTIONS);
              for (;;) {
                  int retval;
  
                  n += strspn(s + n, delimiters);
                  if (s[n] == ')') {
                      break;
                  }
  
                  retval = parse_odp_action(s + n, port_names, actions);
                  if (retval < 0) {
                      return retval;
                  }
                  n += retval;
              }
              nl_msg_end_nested(actions, actions_ofs);
              nl_msg_end_nested(actions, sample_ofs);
  
              return s[n + 1] == ')' ? n + 2 : -EINVAL;
          }
      }
  
      return -EINVAL;
  }
  
  /* Parses the string representation of datapath actions, in the format output
   * by format_odp_action().  Returns 0 if successful, otherwise a positive errno
   * value.  On success, the ODP actions are appended to 'actions' as a series of
   * Netlink attributes.  On failure, no data is appended to 'actions'.  Either
   * way, 'actions''s data might be reallocated. */
  int
  odp_actions_from_string(const char *s, const struct simap *port_names,
                          struct ofpbuf *actions)
  {
      size_t old_size;
  
      if (!strcasecmp(s, "drop")) {
          return 0;
      }
  
      old_size = actions->size;
      for (;;) {
          int retval;
  
          s += strspn(s, delimiters);
          if (!*s) {
              return 0;
          }
  
          retval = parse_odp_action(s, port_names, actions);
          if (retval < 0 || !strchr(delimiters, s[retval])) {
              actions->size = old_size;
              return -retval;
          }
          s += retval;
      }
  
      return 0;
  }
  
  /* Returns the correct length of the payload for a flow key attribute of the
   * specified 'type', -1 if 'type' is unknown, or -2 if the attribute's payload
   * is variable length. */
  static int
  odp_flow_key_attr_len(uint16_t type)
  {
      if (type > OVS_KEY_ATTR_MAX) {
          return -1;
      }
  
      switch ((enum ovs_key_attr) type) {
      case OVS_KEY_ATTR_ENCAP: return -2;
      case OVS_KEY_ATTR_PRIORITY: return 4;
      case OVS_KEY_ATTR_SKB_MARK: return 4;
      case OVS_KEY_ATTR_TUNNEL: return -2;
      case OVS_KEY_ATTR_IN_PORT: return 4;
      case OVS_KEY_ATTR_ETHERNET: return sizeof(struct ovs_key_ethernet);
      case OVS_KEY_ATTR_VLAN: return sizeof(ovs_be16);
      case OVS_KEY_ATTR_ETHERTYPE: return 2;
      case OVS_KEY_ATTR_MPLS: return sizeof(struct ovs_key_mpls);
      case OVS_KEY_ATTR_IPV4: return sizeof(struct ovs_key_ipv4);
      case OVS_KEY_ATTR_IPV6: return sizeof(struct ovs_key_ipv6);
      case OVS_KEY_ATTR_TCP: return sizeof(struct ovs_key_tcp);
      case OVS_KEY_ATTR_UDP: return sizeof(struct ovs_key_udp);
      case OVS_KEY_ATTR_SCTP: return sizeof(struct ovs_key_sctp);
      case OVS_KEY_ATTR_ICMP: return sizeof(struct ovs_key_icmp);
      case OVS_KEY_ATTR_ICMPV6: return sizeof(struct ovs_key_icmpv6);
      case OVS_KEY_ATTR_ARP: return sizeof(struct ovs_key_arp);
      case OVS_KEY_ATTR_ND: return sizeof(struct ovs_key_nd);
  
      case OVS_KEY_ATTR_UNSPEC:
      case __OVS_KEY_ATTR_MAX:
          return -1;
      }
  
      return -1;
  }
  
  static void
  format_generic_odp_key(const struct nlattr *a, struct ds *ds)
  {
      size_t len = nl_attr_get_size(a);
      if (len) {
          const uint8_t *unspec;
          unsigned int i;
  
          unspec = nl_attr_get(a);
          for (i = 0; i < len; i++) {
              if (i) {
                  ds_put_char(ds, ' ');
              }
              ds_put_format(ds, "%02x", unspec[i]);
          }
      }
  }
  
  static const char *
  ovs_frag_type_to_string(enum ovs_frag_type type)
  {
      switch (type) {
      case OVS_FRAG_TYPE_NONE:
          return "no";
      case OVS_FRAG_TYPE_FIRST:
          return "first";
      case OVS_FRAG_TYPE_LATER:
          return "later";
      case __OVS_FRAG_TYPE_MAX:
      default:
          return "<error>";
      }
  }
  
  static int
  tunnel_key_attr_len(int type)
  {
      switch (type) {
      case OVS_TUNNEL_KEY_ATTR_ID: return 8;
      case OVS_TUNNEL_KEY_ATTR_IPV4_SRC: return 4;
      case OVS_TUNNEL_KEY_ATTR_IPV4_DST: return 4;
      case OVS_TUNNEL_KEY_ATTR_TOS: return 1;
      case OVS_TUNNEL_KEY_ATTR_TTL: return 1;
      case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT: return 0;
      case OVS_TUNNEL_KEY_ATTR_CSUM: return 0;
      case __OVS_TUNNEL_KEY_ATTR_MAX:
          return -1;
      }
      return -1;
  }
  
  enum odp_key_fitness
  odp_tun_key_from_attr(const struct nlattr *attr, struct flow_tnl *tun)
  {
      unsigned int left;
      const struct nlattr *a;
      bool ttl = false;
      bool unknown = false;
  
      NL_NESTED_FOR_EACH(a, left, attr) {
          uint16_t type = nl_attr_type(a);
          size_t len = nl_attr_get_size(a);
          int expected_len = tunnel_key_attr_len(type);
  
          if (len != expected_len && expected_len >= 0) {
              return ODP_FIT_ERROR;
          }
  
          switch (type) {
          case OVS_TUNNEL_KEY_ATTR_ID:
              tun->tun_id = nl_attr_get_be64(a);
              tun->flags |= FLOW_TNL_F_KEY;
              break;
          case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
              tun->ip_src = nl_attr_get_be32(a);
              break;
          case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
              tun->ip_dst = nl_attr_get_be32(a);
              break;
          case OVS_TUNNEL_KEY_ATTR_TOS:
              tun->ip_tos = nl_attr_get_u8(a);
              break;
          case OVS_TUNNEL_KEY_ATTR_TTL:
              tun->ip_ttl = nl_attr_get_u8(a);
              ttl = true;
              break;
          case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
              tun->flags |= FLOW_TNL_F_DONT_FRAGMENT;
              break;
          case OVS_TUNNEL_KEY_ATTR_CSUM:
              tun->flags |= FLOW_TNL_F_CSUM;
              break;
          default:
              /* Allow this to show up as unexpected, if there are unknown
               * tunnel attribute, eventually resulting in ODP_FIT_TOO_MUCH. */
              unknown = true;
              break;
          }
      }
  
      if (!ttl) {
          return ODP_FIT_ERROR;
      }
      if (unknown) {
              return ODP_FIT_TOO_MUCH;
      }
      return ODP_FIT_PERFECT;
  }
  
  static void
  tun_key_to_attr(struct ofpbuf *a, const struct flow_tnl *tun_key)
  {
      size_t tun_key_ofs;
  
      tun_key_ofs = nl_msg_start_nested(a, OVS_KEY_ATTR_TUNNEL);
  
      if (tun_key->flags & FLOW_TNL_F_KEY) {
          nl_msg_put_be64(a, OVS_TUNNEL_KEY_ATTR_ID, tun_key->tun_id);
      }
      if (tun_key->ip_src) {
          nl_msg_put_be32(a, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, tun_key->ip_src);
      }
      if (tun_key->ip_dst) {
          nl_msg_put_be32(a, OVS_TUNNEL_KEY_ATTR_IPV4_DST, tun_key->ip_dst);
      }
      if (tun_key->ip_tos) {
          nl_msg_put_u8(a, OVS_TUNNEL_KEY_ATTR_TOS, tun_key->ip_tos);
      }
      nl_msg_put_u8(a, OVS_TUNNEL_KEY_ATTR_TTL, tun_key->ip_ttl);
      if (tun_key->flags & FLOW_TNL_F_DONT_FRAGMENT) {
          nl_msg_put_flag(a, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT);
      }
      if (tun_key->flags & FLOW_TNL_F_CSUM) {
          nl_msg_put_flag(a, OVS_TUNNEL_KEY_ATTR_CSUM);
      }
  
      nl_msg_end_nested(a, tun_key_ofs);
  }
  
  static bool
  odp_mask_attr_is_wildcard(const struct nlattr *ma)
  {
      return is_all_zeros(nl_attr_get(ma), nl_attr_get_size(ma));
  }
  
  static bool
  odp_mask_attr_is_exact(const struct nlattr *ma)
  {
      bool is_exact = false;
      enum ovs_key_attr attr = nl_attr_type(ma);
  
      if (attr == OVS_KEY_ATTR_TUNNEL) {
          /* XXX this is a hack for now. Should change
           * the exact match dection to per field
           * instead of per attribute.
           */
          struct flow_tnl tun_mask;
          memset(&tun_mask, 0, sizeof tun_mask);
          odp_tun_key_from_attr(ma, &tun_mask);
          if (tun_mask.flags == (FLOW_TNL_F_KEY
                                 | FLOW_TNL_F_DONT_FRAGMENT
                                 | FLOW_TNL_F_CSUM)) {
              /* The flags are exact match, check the remaining fields. */
              tun_mask.flags = 0xffff;
              is_exact = is_all_ones((uint8_t *)&tun_mask,
                                     offsetof(struct flow_tnl, ip_ttl));
          }
      } else {
          is_exact = is_all_ones(nl_attr_get(ma), nl_attr_get_size(ma));
      }
  
      return is_exact;
  }
  
  
  static void
  format_odp_key_attr(const struct nlattr *a, const struct nlattr *ma,
                      struct ds *ds, bool verbose)
  {
      struct flow_tnl tun_key;
      enum ovs_key_attr attr = nl_attr_type(a);
      char namebuf[OVS_KEY_ATTR_BUFSIZE];
      int expected_len;
      bool is_exact;
  
      is_exact = ma ? odp_mask_attr_is_exact(ma) : true;
  
      ds_put_cstr(ds, ovs_key_attr_to_string(attr, namebuf, sizeof namebuf));
  
      {
          expected_len = odp_flow_key_attr_len(nl_attr_type(a));
          if (expected_len != -2) {
              bool bad_key_len = nl_attr_get_size(a) != expected_len;
              bool bad_mask_len = ma && nl_attr_get_size(a) != expected_len;
  
              if (bad_key_len || bad_mask_len) {
                  if (bad_key_len) {
                      ds_put_format(ds, "(bad key length %zu, expected %d)(",
                                    nl_attr_get_size(a),
                                    odp_flow_key_attr_len(nl_attr_type(a)));
                  }
                  format_generic_odp_key(a, ds);
                  if (bad_mask_len) {
                      ds_put_char(ds, '/');
                      ds_put_format(ds, "(bad mask length %zu, expected %d)(",
                                    nl_attr_get_size(ma),
                                    odp_flow_key_attr_len(nl_attr_type(ma)));
                  }
                  format_generic_odp_key(ma, ds);
                  ds_put_char(ds, ')');
                  return;
              }
          }
      }
  
      ds_put_char(ds, '(');
      switch (attr) {
      case OVS_KEY_ATTR_ENCAP:
          if (ma && nl_attr_get_size(ma) && nl_attr_get_size(a)) {
              odp_flow_format(nl_attr_get(a), nl_attr_get_size(a),
                              nl_attr_get(ma), nl_attr_get_size(ma), ds, verbose);
          } else if (nl_attr_get_size(a)) {
              odp_flow_format(nl_attr_get(a), nl_attr_get_size(a), NULL, 0, ds,
                              verbose);
          }
          break;
  
      case OVS_KEY_ATTR_PRIORITY:
      case OVS_KEY_ATTR_SKB_MARK:
          ds_put_format(ds, "%#"PRIx32, nl_attr_get_u32(a));
          if (!is_exact) {
              ds_put_format(ds, "/%#"PRIx32, nl_attr_get_u32(ma));
          }
          break;
  
      case OVS_KEY_ATTR_TUNNEL:
          memset(&tun_key, 0, sizeof tun_key);
          if (odp_tun_key_from_attr(a, &tun_key) == ODP_FIT_ERROR) {
              ds_put_format(ds, "error");
          } else if (!is_exact) {
              struct flow_tnl tun_mask;
  
              memset(&tun_mask, 0, sizeof tun_mask);
              odp_tun_key_from_attr(ma, &tun_mask);
              ds_put_format(ds, "tun_id=%#"PRIx64"/%#"PRIx64
                            ",src="IP_FMT"/"IP_FMT",dst="IP_FMT"/"IP_FMT
                            ",tos=%#"PRIx8"/%#"PRIx8",ttl=%"PRIu8"/%#"PRIx8
                            ",flags(",
                            ntohll(tun_key.tun_id), ntohll(tun_mask.tun_id),
                            IP_ARGS(tun_key.ip_src), IP_ARGS(tun_mask.ip_src),
                            IP_ARGS(tun_key.ip_dst), IP_ARGS(tun_mask.ip_dst),
                            tun_key.ip_tos, tun_mask.ip_tos,
                            tun_key.ip_ttl, tun_mask.ip_ttl);
  
              format_flags(ds, flow_tun_flag_to_string, tun_key.flags, ',');
  
              /* XXX This code is correct, but enabling it would break the unit
                 test. Disable it for now until the input parser is fixed.
  
                  ds_put_char(ds, '/');
                  format_flags(ds, flow_tun_flag_to_string, tun_mask.flags, ',');
              */
              ds_put_char(ds, ')');
          } else {
              ds_put_format(ds, "tun_id=0x%"PRIx64",src="IP_FMT",dst="IP_FMT","
                            "tos=0x%"PRIx8",ttl=%"PRIu8",flags(",
                            ntohll(tun_key.tun_id),
                            IP_ARGS(tun_key.ip_src),
                            IP_ARGS(tun_key.ip_dst),
                            tun_key.ip_tos, tun_key.ip_ttl);
  
              format_flags(ds, flow_tun_flag_to_string, tun_key.flags, ',');
              ds_put_char(ds, ')');
          }
          break;
  
      case OVS_KEY_ATTR_IN_PORT:
          ds_put_format(ds, "%"PRIu32, nl_attr_get_u32(a));
          if (!is_exact) {
              ds_put_format(ds, "/%#"PRIx32, nl_attr_get_u32(ma));
          }
          break;
  
      case OVS_KEY_ATTR_ETHERNET:
          if (!is_exact) {
              const struct ovs_key_ethernet *eth_mask = nl_attr_get(ma);
              const struct ovs_key_ethernet *eth_key = nl_attr_get(a);
  
              ds_put_format(ds, "src="ETH_ADDR_FMT"/"ETH_ADDR_FMT
                            ",dst="ETH_ADDR_FMT"/"ETH_ADDR_FMT,
                            ETH_ADDR_ARGS(eth_key->eth_src),
                            ETH_ADDR_ARGS(eth_mask->eth_src),
                            ETH_ADDR_ARGS(eth_key->eth_dst),
                            ETH_ADDR_ARGS(eth_mask->eth_dst));
          } else {
              const struct ovs_key_ethernet *eth_key = nl_attr_get(a);
  
              ds_put_format(ds, "src="ETH_ADDR_FMT",dst="ETH_ADDR_FMT,
                            ETH_ADDR_ARGS(eth_key->eth_src),
                            ETH_ADDR_ARGS(eth_key->eth_dst));
          }
          break;
  
      case OVS_KEY_ATTR_VLAN:
          {
              ovs_be16 vlan_tci = nl_attr_get_be16(a);
              if (!is_exact) {
                  ovs_be16 mask = nl_attr_get_be16(ma);
                  ds_put_format(ds, "vid=%"PRIu16"/0x%"PRIx16",pcp=%d/0x%x,cfi=%d/%d",
                                vlan_tci_to_vid(vlan_tci),
                                vlan_tci_to_vid(mask),
                                vlan_tci_to_pcp(vlan_tci),
                                vlan_tci_to_pcp(mask),
                                vlan_tci_to_cfi(vlan_tci),
                                vlan_tci_to_cfi(mask));
              } else {
                  format_vlan_tci(ds, vlan_tci);
              }
          }
          break;
  
      case OVS_KEY_ATTR_MPLS: {
          const struct ovs_key_mpls *mpls_key = nl_attr_get(a);
          const struct ovs_key_mpls *mpls_mask = NULL;
          if (!is_exact) {
              mpls_mask = nl_attr_get(ma);
          }
          format_mpls(ds, mpls_key, mpls_mask);
          break;
      }
  
      case OVS_KEY_ATTR_ETHERTYPE:
          ds_put_format(ds, "0x%04"PRIx16, ntohs(nl_attr_get_be16(a)));
          if (!is_exact) {
              ds_put_format(ds, "/0x%04"PRIx16, ntohs(nl_attr_get_be16(ma)));
          }
          break;
  
      case OVS_KEY_ATTR_IPV4:
          if (!is_exact) {
              const struct ovs_key_ipv4 *ipv4_key = nl_attr_get(a);
              const struct ovs_key_ipv4 *ipv4_mask = nl_attr_get(ma);
  
              ds_put_format(ds, "src="IP_FMT"/"IP_FMT",dst="IP_FMT"/"IP_FMT
                            ",proto=%"PRIu8"/%#"PRIx8",tos=%#"PRIx8"/%#"PRIx8
                            ",ttl=%"PRIu8"/%#"PRIx8",frag=%s/%#"PRIx8,
                            IP_ARGS(ipv4_key->ipv4_src),
                            IP_ARGS(ipv4_mask->ipv4_src),
                            IP_ARGS(ipv4_key->ipv4_dst),
                            IP_ARGS(ipv4_mask->ipv4_dst),
                            ipv4_key->ipv4_proto, ipv4_mask->ipv4_proto,
                            ipv4_key->ipv4_tos, ipv4_mask->ipv4_tos,
                            ipv4_key->ipv4_ttl, ipv4_mask->ipv4_ttl,
                            ovs_frag_type_to_string(ipv4_key->ipv4_frag),
                            ipv4_mask->ipv4_frag);
          } else {
              const struct ovs_key_ipv4 *ipv4_key = nl_attr_get(a);
  
              ds_put_format(ds, "src="IP_FMT",dst="IP_FMT",proto=%"PRIu8
                            ",tos=%#"PRIx8",ttl=%"PRIu8",frag=%s",
                            IP_ARGS(ipv4_key->ipv4_src),
                            IP_ARGS(ipv4_key->ipv4_dst),
                            ipv4_key->ipv4_proto, ipv4_key->ipv4_tos,
                            ipv4_key->ipv4_ttl,
                            ovs_frag_type_to_string(ipv4_key->ipv4_frag));
          }
          break;
  
      case OVS_KEY_ATTR_IPV6:
          if (!is_exact) {
              const struct ovs_key_ipv6 *ipv6_key, *ipv6_mask;
              char src_str[INET6_ADDRSTRLEN];
              char dst_str[INET6_ADDRSTRLEN];
              char src_mask[INET6_ADDRSTRLEN];
              char dst_mask[INET6_ADDRSTRLEN];
  
              ipv6_key = nl_attr_get(a);
              inet_ntop(AF_INET6, ipv6_key->ipv6_src, src_str, sizeof src_str);
              inet_ntop(AF_INET6, ipv6_key->ipv6_dst, dst_str, sizeof dst_str);
  
              ipv6_mask = nl_attr_get(ma);
              inet_ntop(AF_INET6, ipv6_mask->ipv6_src, src_mask, sizeof src_mask);
              inet_ntop(AF_INET6, ipv6_mask->ipv6_dst, dst_mask, sizeof dst_mask);
  
              ds_put_format(ds, "src=%s/%s,dst=%s/%s,label=%#"PRIx32"/%#"PRIx32
                            ",proto=%"PRIu8"/%#"PRIx8",tclass=%#"PRIx8"/%#"PRIx8
                            ",hlimit=%"PRIu8"/%#"PRIx8",frag=%s/%#"PRIx8,
                            src_str, src_mask, dst_str, dst_mask,
                            ntohl(ipv6_key->ipv6_label),
                            ntohl(ipv6_mask->ipv6_label),
                            ipv6_key->ipv6_proto, ipv6_mask->ipv6_proto,
                            ipv6_key->ipv6_tclass, ipv6_mask->ipv6_tclass,
                            ipv6_key->ipv6_hlimit, ipv6_mask->ipv6_hlimit,
                            ovs_frag_type_to_string(ipv6_key->ipv6_frag),
                            ipv6_mask->ipv6_frag);
          } else {
              const struct ovs_key_ipv6 *ipv6_key;
              char src_str[INET6_ADDRSTRLEN];
              char dst_str[INET6_ADDRSTRLEN];
  
              ipv6_key = nl_attr_get(a);
              inet_ntop(AF_INET6, ipv6_key->ipv6_src, src_str, sizeof src_str);
              inet_ntop(AF_INET6, ipv6_key->ipv6_dst, dst_str, sizeof dst_str);
  
              ds_put_format(ds, "src=%s,dst=%s,label=%#"PRIx32",proto=%"PRIu8
                            ",tclass=%#"PRIx8",hlimit=%"PRIu8",frag=%s",
                            src_str, dst_str, ntohl(ipv6_key->ipv6_label),
                            ipv6_key->ipv6_proto, ipv6_key->ipv6_tclass,
                            ipv6_key->ipv6_hlimit,
                            ovs_frag_type_to_string(ipv6_key->ipv6_frag));
          }
          break;
  
      case OVS_KEY_ATTR_TCP:
          if (!is_exact) {
              const struct ovs_key_tcp *tcp_mask = nl_attr_get(ma);
              const struct ovs_key_tcp *tcp_key = nl_attr_get(a);
  
              ds_put_format(ds, "src=%"PRIu16"/%#"PRIx16
                            ",dst=%"PRIu16"/%#"PRIx16,
                            ntohs(tcp_key->tcp_src), ntohs(tcp_mask->tcp_src),
                            ntohs(tcp_key->tcp_dst), ntohs(tcp_mask->tcp_dst));
          } else {
              const struct ovs_key_tcp *tcp_key = nl_attr_get(a);
  
              ds_put_format(ds, "src=%"PRIu16",dst=%"PRIu16,
                            ntohs(tcp_key->tcp_src), ntohs(tcp_key->tcp_dst));
          }
          break;
  
      case OVS_KEY_ATTR_UDP:
          if (!is_exact) {
              const struct ovs_key_udp *udp_mask = nl_attr_get(ma);
              const struct ovs_key_udp *udp_key = nl_attr_get(a);
  
              ds_put_format(ds, "src=%"PRIu16"/%#"PRIx16
                            ",dst=%"PRIu16"/%#"PRIx16,
                            ntohs(udp_key->udp_src), ntohs(udp_mask->udp_src),
                            ntohs(udp_key->udp_dst), ntohs(udp_mask->udp_dst));
          } else {
              const struct ovs_key_udp *udp_key = nl_attr_get(a);
  
              ds_put_format(ds, "src=%"PRIu16",dst=%"PRIu16,
                            ntohs(udp_key->udp_src), ntohs(udp_key->udp_dst));
          }
          break;
  
      case OVS_KEY_ATTR_SCTP:
          if (ma) {
              const struct ovs_key_sctp *sctp_mask = nl_attr_get(ma);
              const struct ovs_key_sctp *sctp_key = nl_attr_get(a);
  
              ds_put_format(ds, "src=%"PRIu16"/%#"PRIx16
                            ",dst=%"PRIu16"/%#"PRIx16,
                            ntohs(sctp_key->sctp_src), ntohs(sctp_mask->sctp_src),
                            ntohs(sctp_key->sctp_dst), ntohs(sctp_mask->sctp_dst));
          } else {
              const struct ovs_key_sctp *sctp_key = nl_attr_get(a);
  
              ds_put_format(ds, "(src=%"PRIu16",dst=%"PRIu16")",
                            ntohs(sctp_key->sctp_src), ntohs(sctp_key->sctp_dst));
          }
          break;
  
      case OVS_KEY_ATTR_ICMP:
          if (!is_exact) {
              const struct ovs_key_icmp *icmp_mask = nl_attr_get(ma);
              const struct ovs_key_icmp *icmp_key = nl_attr_get(a);
  
              ds_put_format(ds, "type=%"PRIu8"/%#"PRIx8",code=%"PRIu8"/%#"PRIx8,
                            icmp_key->icmp_type, icmp_mask->icmp_type,
                            icmp_key->icmp_code, icmp_mask->icmp_code);
          } else {
              const struct ovs_key_icmp *icmp_key = nl_attr_get(a);
  
              ds_put_format(ds, "type=%"PRIu8",code=%"PRIu8,
                            icmp_key->icmp_type, icmp_key->icmp_code);
          }
          break;
  
      case OVS_KEY_ATTR_ICMPV6:
          if (!is_exact) {
              const struct ovs_key_icmpv6 *icmpv6_mask = nl_attr_get(ma);
              const struct ovs_key_icmpv6 *icmpv6_key = nl_attr_get(a);
  
              ds_put_format(ds, "type=%"PRIu8"/%#"PRIx8",code=%"PRIu8"/%#"PRIx8,
                            icmpv6_key->icmpv6_type, icmpv6_mask->icmpv6_type,
                            icmpv6_key->icmpv6_code, icmpv6_mask->icmpv6_code);
          } else {
              const struct ovs_key_icmpv6 *icmpv6_key = nl_attr_get(a);
  
              ds_put_format(ds, "type=%"PRIu8",code=%"PRIu8,
                            icmpv6_key->icmpv6_type, icmpv6_key->icmpv6_code);
          }
          break;
  
      case OVS_KEY_ATTR_ARP:
          if (!is_exact) {
              const struct ovs_key_arp *arp_mask = nl_attr_get(ma);
              const struct ovs_key_arp *arp_key = nl_attr_get(a);
  
              ds_put_format(ds, "sip="IP_FMT"/"IP_FMT",tip="IP_FMT"/"IP_FMT
                            ",op=%"PRIu16"/%#"PRIx16
                            ",sha="ETH_ADDR_FMT"/"ETH_ADDR_FMT
                            ",tha="ETH_ADDR_FMT"/"ETH_ADDR_FMT,
                            IP_ARGS(arp_key->arp_sip),
                            IP_ARGS(arp_mask->arp_sip),
                            IP_ARGS(arp_key->arp_tip),
                            IP_ARGS(arp_mask->arp_tip),
                            ntohs(arp_key->arp_op), ntohs(arp_mask->arp_op),
                            ETH_ADDR_ARGS(arp_key->arp_sha),
                            ETH_ADDR_ARGS(arp_mask->arp_sha),
                            ETH_ADDR_ARGS(arp_key->arp_tha),
                            ETH_ADDR_ARGS(arp_mask->arp_tha));
          } else {
              const struct ovs_key_arp *arp_key = nl_attr_get(a);
  
              ds_put_format(ds, "sip="IP_FMT",tip="IP_FMT",op=%"PRIu16","
                            "sha="ETH_ADDR_FMT",tha="ETH_ADDR_FMT,
                            IP_ARGS(arp_key->arp_sip), IP_ARGS(arp_key->arp_tip),
                            ntohs(arp_key->arp_op),
                            ETH_ADDR_ARGS(arp_key->arp_sha),
                            ETH_ADDR_ARGS(arp_key->arp_tha));
          }
          break;
  
      case OVS_KEY_ATTR_ND: {
          const struct ovs_key_nd *nd_key, *nd_mask = NULL;
          char target[INET6_ADDRSTRLEN];
  
          nd_key = nl_attr_get(a);
          if (!is_exact) {
              nd_mask = nl_attr_get(ma);
          }
  
          inet_ntop(AF_INET6, nd_key->nd_target, target, sizeof target);
          ds_put_format(ds, "target=%s", target);
          if (!is_exact) {
              inet_ntop(AF_INET6, nd_mask->nd_target, target, sizeof target);
              ds_put_format(ds, "/%s", target);
          }
  
          if (!eth_addr_is_zero(nd_key->nd_sll)) {
              ds_put_format(ds, ",sll="ETH_ADDR_FMT,
                            ETH_ADDR_ARGS(nd_key->nd_sll));
              if (!is_exact) {
                  ds_put_format(ds, "/"ETH_ADDR_FMT,
                                ETH_ADDR_ARGS(nd_mask->nd_sll));
              }
          }
          if (!eth_addr_is_zero(nd_key->nd_tll)) {
              ds_put_format(ds, ",tll="ETH_ADDR_FMT,
                            ETH_ADDR_ARGS(nd_key->nd_tll));
              if (!is_exact) {
                  ds_put_format(ds, "/"ETH_ADDR_FMT,
                                ETH_ADDR_ARGS(nd_mask->nd_tll));
              }
          }
          break;
      }
  
      case OVS_KEY_ATTR_UNSPEC:
      case __OVS_KEY_ATTR_MAX:
      default:
          format_generic_odp_key(a, ds);
          if (!is_exact) {
              ds_put_char(ds, '/');
              format_generic_odp_key(ma, ds);
          }
          break;
      }
      ds_put_char(ds, ')');
  }
  
  static struct nlattr *
  generate_all_wildcard_mask(struct ofpbuf *ofp, const struct nlattr *key)
  {
      const struct nlattr *a;
      unsigned int left;
      int type = nl_attr_type(key);
      int size = nl_attr_get_size(key);
  
      if (odp_flow_key_attr_len(type) >=0) {
          memset(nl_msg_put_unspec_uninit(ofp, type, size), 0, size);
      } else {
          size_t nested_mask;
  
          nested_mask = nl_msg_start_nested(ofp, type);
          NL_ATTR_FOR_EACH(a, left, key, nl_attr_get_size(key)) {
              generate_all_wildcard_mask(ofp, nl_attr_get(a));
          }
          nl_msg_end_nested(ofp, nested_mask);
      }
  
      return ofp->base;
  }
  
  /* Appends to 'ds' a string representation of the 'key_len' bytes of
   * OVS_KEY_ATTR_* attributes in 'key'. If non-null, additionally formats the
   * 'mask_len' bytes of 'mask' which apply to 'key'. */
  void
  odp_flow_format(const struct nlattr *key, size_t key_len,
                  const struct nlattr *mask, size_t mask_len,
                  struct ds *ds, bool verbose)
  {
      if (key_len) {
          const struct nlattr *a;
          unsigned int left;
          bool has_ethtype_key = false;
          const struct nlattr *ma = NULL;
          struct ofpbuf ofp;
          bool first_field = true;
  
          ofpbuf_init(&ofp, 100);
          NL_ATTR_FOR_EACH (a, left, key, key_len) {
              bool is_nested_attr;
              bool is_wildcard = false;
              int attr_type = nl_attr_type(a);
  
              if (attr_type == OVS_KEY_ATTR_ETHERTYPE) {
                  has_ethtype_key = true;
              }
  
              is_nested_attr = (odp_flow_key_attr_len(attr_type) == -2);
  
              if (mask && mask_len) {
                  ma = nl_attr_find__(mask, mask_len, nl_attr_type(a));
                  is_wildcard = ma ? odp_mask_attr_is_wildcard(ma) : true;
              }
  
              if (verbose || !is_wildcard  || is_nested_attr) {
                  if (is_wildcard && !ma) {
                      ma = generate_all_wildcard_mask(&ofp, a);
                  }
                  if (!first_field) {
                      ds_put_char(ds, ',');
                  }
                  format_odp_key_attr(a, ma, ds, verbose);
                  first_field = false;
              }
              ofpbuf_clear(&ofp);
          }
          ofpbuf_uninit(&ofp);
  
          if (left) {
              int i;
              
              if (left == key_len) {
                  ds_put_cstr(ds, "<empty>");
              }
              ds_put_format(ds, ",***%u leftover bytes*** (", left);
              for (i = 0; i < left; i++) {
                  ds_put_format(ds, "%02x", ((const uint8_t *) a)[i]);
              }
              ds_put_char(ds, ')');
          }
          if (!has_ethtype_key) {
              ma = nl_attr_find__(mask, mask_len, OVS_KEY_ATTR_ETHERTYPE);
              if (ma) {
                  ds_put_format(ds, ",eth_type(0/0x%04"PRIx16")",
                                ntohs(nl_attr_get_be16(ma)));
              }
          }
      } else {
          ds_put_cstr(ds, "<empty>");
      }
  }
  
  /* Appends to 'ds' a string representation of the 'key_len' bytes of
   * OVS_KEY_ATTR_* attributes in 'key'. */
  void
  odp_flow_key_format(const struct nlattr *key,
                      size_t key_len, struct ds *ds)
  {
      odp_flow_format(key, key_len, NULL, 0, ds, true);
  }
  
  static void
  put_nd(struct ovs_key_nd* nd_key, const uint8_t *nd_sll,
         const uint8_t *nd_tll, struct ofpbuf *key)
  {
      if (nd_sll) {
          memcpy(nd_key->nd_sll, nd_sll, ETH_ADDR_LEN);
      }
  
      if (nd_tll) {
          memcpy(nd_key->nd_tll, nd_tll, ETH_ADDR_LEN);
      }
  
      nl_msg_put_unspec(key, OVS_KEY_ATTR_ND, nd_key, sizeof *nd_key);
  }
  
  static int
  put_nd_key(int n, const char *nd_target_s, const uint8_t *nd_sll,
             const uint8_t *nd_tll, struct ofpbuf *key)
  {
      struct ovs_key_nd nd_key;
  
      memset(&nd_key, 0, sizeof nd_key);
  
      if (inet_pton(AF_INET6, nd_target_s, nd_key.nd_target) != 1) {
          return -EINVAL;
      }
  
      put_nd(&nd_key, nd_sll, nd_tll, key);
      return n;
  }
  
  static int
  put_nd_mask(int n, const char *nd_target_s,
             const uint8_t *nd_sll, const uint8_t *nd_tll, struct ofpbuf *mask)
  {
      struct ovs_key_nd nd_mask;
  
      memset(&nd_mask, 0xff, sizeof nd_mask);
  
      if (strlen(nd_target_s) != 0 &&
              inet_pton(AF_INET6, nd_target_s, nd_mask.nd_target) != 1) {
          return -EINVAL;
      }
  
      put_nd(&nd_mask, nd_sll, nd_tll, mask);
      return n;
  }
  
  static bool
  ovs_frag_type_from_string(const char *s, enum ovs_frag_type *type)
  {
      if (!strcasecmp(s, "no")) {
          *type = OVS_FRAG_TYPE_NONE;
      } else if (!strcasecmp(s, "first")) {
          *type = OVS_FRAG_TYPE_FIRST;
      } else if (!strcasecmp(s, "later")) {
          *type = OVS_FRAG_TYPE_LATER;
      } else {
          return false;
      }
      return true;
  }
  
  static ovs_be32
  mpls_lse_from_components(int mpls_label, int mpls_tc, int mpls_ttl, int mpls_bos)
  {
      return (htonl((mpls_label << MPLS_LABEL_SHIFT) |
                    (mpls_tc << MPLS_TC_SHIFT)       |
                    (mpls_ttl << MPLS_TTL_SHIFT)     |
                    (mpls_bos << MPLS_BOS_SHIFT)));
  }
  
  static int
  parse_odp_key_mask_attr(const char *s, const struct simap *port_names,
                          struct ofpbuf *key, struct ofpbuf *mask)
  {
      /* Many of the sscanf calls in this function use oversized destination
       * fields because some sscanf() implementations truncate the range of %i
       * directives, so that e.g. "%"SCNi16 interprets input of "0xfedc" as a
       * value of 0x7fff.  The other alternatives are to allow only a single
       * radix (e.g. decimal or hexadecimal) or to write more sophisticated
       * parsers.
       *
       * The tun_id parser has to use an alternative approach because there is no
       * type larger than 64 bits. */
  
      {
          unsigned long long int priority;
          unsigned long long int priority_mask;
          int n = -1;
  
          if (mask && sscanf(s, "skb_priority(%lli/%lli)%n", &priority,
                     &priority_mask, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_PRIORITY, priority);
              nl_msg_put_u32(mask, OVS_KEY_ATTR_PRIORITY, priority_mask);
              return n;
          } else if (sscanf(s, "skb_priority(%lli)%n",
                            &priority, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_PRIORITY, priority);
              if (mask) {
                  nl_msg_put_u32(mask, OVS_KEY_ATTR_PRIORITY, UINT32_MAX);
              }
              return n;
          }
      }
  
      {
          unsigned long long int mark;
          unsigned long long int mark_mask;
          int n = -1;
  
          if (mask && sscanf(s, "skb_mark(%lli/%lli)%n", &mark,
                     &mark_mask, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_SKB_MARK, mark);
              nl_msg_put_u32(mask, OVS_KEY_ATTR_SKB_MARK, mark_mask);
              return n;
          } else if (sscanf(s, "skb_mark(%lli)%n", &mark, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_SKB_MARK, mark);
              if (mask) {
                  nl_msg_put_u32(mask, OVS_KEY_ATTR_SKB_MARK, UINT32_MAX);
              }
              return n;
          }
      }
  
      {
          char tun_id_s[32];
          int tos, tos_mask, ttl, ttl_mask;
          struct flow_tnl tun_key, tun_key_mask;
          unsigned long long tun_id_mask;
          int n = -1;
  
          if (mask && sscanf(s, "tunnel(tun_id=%31[x0123456789abcdefABCDEF]/%llx,"
                     "src="IP_SCAN_FMT"/"IP_SCAN_FMT",dst="IP_SCAN_FMT
                     "/"IP_SCAN_FMT",tos=%i/%i,ttl=%i/%i,flags%n",
                     tun_id_s, &tun_id_mask,
                     IP_SCAN_ARGS(&tun_key.ip_src),
                     IP_SCAN_ARGS(&tun_key_mask.ip_src),
                     IP_SCAN_ARGS(&tun_key.ip_dst),
                     IP_SCAN_ARGS(&tun_key_mask.ip_dst),
                     &tos, &tos_mask, &ttl, &ttl_mask,
                     &n) > 0 && n > 0) {
              int res;
              uint32_t flags;
  
              tun_key.tun_id = htonll(strtoull(tun_id_s, NULL, 0));
              tun_key_mask.tun_id = htonll(tun_id_mask);
              tun_key.ip_tos = tos;
              tun_key_mask.ip_tos = tos_mask;
              tun_key.ip_ttl = ttl;
              tun_key_mask.ip_ttl = ttl_mask;
              res = parse_flags(&s[n], flow_tun_flag_to_string, &flags);
              tun_key.flags = flags;
              tun_key_mask.flags = UINT16_MAX;
  
              if (res < 0) {
                  return res;
              }
              n += res;
              if (s[n] != ')') {
                  return -EINVAL;
              }
              n++;
              tun_key_to_attr(key, &tun_key);
              if (mask) {
                  tun_key_to_attr(mask, &tun_key_mask);
              }
              return n;
          } else if (sscanf(s, "tunnel(tun_id=%31[x0123456789abcdefABCDEF],"
                     "src="IP_SCAN_FMT",dst="IP_SCAN_FMT
                     ",tos=%i,ttl=%i,flags%n", tun_id_s,
                      IP_SCAN_ARGS(&tun_key.ip_src),
                      IP_SCAN_ARGS(&tun_key.ip_dst), &tos, &ttl,
                      &n) > 0 && n > 0) {
              int res;
              uint32_t flags;
  
              tun_key.tun_id = htonll(strtoull(tun_id_s, NULL, 0));
              tun_key.ip_tos = tos;
              tun_key.ip_ttl = ttl;
              res = parse_flags(&s[n], flow_tun_flag_to_string, &flags);
              tun_key.flags = flags;
  
              if (res < 0) {
                  return res;
              }
              n += res;
              if (s[n] != ')') {
                  return -EINVAL;
              }
              n++;
              tun_key_to_attr(key, &tun_key);
  
              if (mask) {
                  memset(&tun_key, 0xff, sizeof tun_key);
                  tun_key_to_attr(mask, &tun_key);
              }
              return n;
          }
      }
  
      {
          unsigned long long int in_port;
          unsigned long long int in_port_mask;
          int n = -1;
  
          if (mask && sscanf(s, "in_port(%lli/%lli)%n", &in_port,
                     &in_port_mask, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_IN_PORT, in_port);
              nl_msg_put_u32(mask, OVS_KEY_ATTR_IN_PORT, in_port_mask);
              return n;
          } else if (sscanf(s, "in_port(%lli)%n", &in_port, &n) > 0 && n > 0) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_IN_PORT, in_port);
              if (mask) {
                  nl_msg_put_u32(mask, OVS_KEY_ATTR_IN_PORT, UINT32_MAX);
              }
              return n;
          }
      }
  
  
      if (port_names && !strncmp(s, "in_port(", 8)) {
          const char *name;
          const struct simap_node *node;
          int name_len;
  
          name = s + 8;
          name_len = strcspn(s, ")");
          node = simap_find_len(port_names, name, name_len);
          if (node) {
              nl_msg_put_u32(key, OVS_KEY_ATTR_IN_PORT, node->data);
  
              if (mask) {
                  nl_msg_put_u32(mask, OVS_KEY_ATTR_IN_PORT, UINT32_MAX);
              }
              return 8 + name_len + 1;
          }
      }
  
      {
          struct ovs_key_ethernet eth_key;
          struct ovs_key_ethernet eth_key_mask;
          int n = -1;
  
          if (mask && sscanf(s,
                     "eth(src="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT","
                          "dst="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT")%n",
                  ETH_ADDR_SCAN_ARGS(eth_key.eth_src),
                  ETH_ADDR_SCAN_ARGS(eth_key_mask.eth_src),
                  ETH_ADDR_SCAN_ARGS(eth_key.eth_dst),
                  ETH_ADDR_SCAN_ARGS(eth_key_mask.eth_dst), &n) > 0 && n > 0) {
  
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ETHERNET,
                                &eth_key, sizeof eth_key);
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_ETHERNET,
                                &eth_key_mask, sizeof eth_key_mask);
              return n;
          } else if (sscanf(s,
                     "eth(src="ETH_ADDR_SCAN_FMT",dst="ETH_ADDR_SCAN_FMT")%n",
                     ETH_ADDR_SCAN_ARGS(eth_key.eth_src),
                     ETH_ADDR_SCAN_ARGS(eth_key.eth_dst), &n) > 0 && n > 0) {
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ETHERNET,
                                &eth_key, sizeof eth_key);
  
              if (mask) {
                  memset(&eth_key, 0xff, sizeof eth_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_ETHERNET,
                                &eth_key, sizeof eth_key);
              }
              return n;
          }
      }
  
      {
          uint16_t vid, vid_mask;
          int pcp, pcp_mask;
          int cfi, cfi_mask;
          int n = -1;
  
          if (mask && (sscanf(s, "vlan(vid=%"SCNi16"/%"SCNi16",pcp=%i/%i)%n",
                              &vid, &vid_mask, &pcp, &pcp_mask, &n) > 0 && n > 0)) {
              nl_msg_put_be16(key, OVS_KEY_ATTR_VLAN,
                              htons((vid << VLAN_VID_SHIFT) |
                                    (pcp << VLAN_PCP_SHIFT) |
                                    VLAN_CFI));
              nl_msg_put_be16(mask, OVS_KEY_ATTR_VLAN,
                              htons((vid_mask << VLAN_VID_SHIFT) |
                                    (pcp_mask << VLAN_PCP_SHIFT) |
                                    (1 << VLAN_CFI_SHIFT)));
              return n;
          } else if ((sscanf(s, "vlan(vid=%"SCNi16",pcp=%i)%n",
                             &vid, &pcp, &n) > 0 && n > 0)) {
              nl_msg_put_be16(key, OVS_KEY_ATTR_VLAN,
                              htons((vid << VLAN_VID_SHIFT) |
                                    (pcp << VLAN_PCP_SHIFT) |
                                    VLAN_CFI));
              if (mask) {
                  nl_msg_put_be16(mask, OVS_KEY_ATTR_VLAN, htons(UINT16_MAX));
              }
              return n;
          } else if (mask && (sscanf(s, "vlan(vid=%"SCNi16"/%"SCNi16",pcp=%i/%i,cfi=%i/%i)%n",
                                     &vid, &vid_mask, &pcp, &pcp_mask, &cfi, &cfi_mask, &n) > 0 && n > 0)) {
              nl_msg_put_be16(key, OVS_KEY_ATTR_VLAN,
                              htons((vid << VLAN_VID_SHIFT) |
                                    (pcp << VLAN_PCP_SHIFT) |
                                    (cfi ? VLAN_CFI : 0)));
              nl_msg_put_be16(mask, OVS_KEY_ATTR_VLAN,
                              htons((vid_mask << VLAN_VID_SHIFT) |
                                    (pcp_mask << VLAN_PCP_SHIFT) |
                                    (cfi_mask << VLAN_CFI_SHIFT)));
              return n;
          } else if ((sscanf(s, "vlan(vid=%"SCNi16",pcp=%i,cfi=%i)%n",
                             &vid, &pcp, &cfi, &n) > 0 && n > 0)) {
              nl_msg_put_be16(key, OVS_KEY_ATTR_VLAN,
                              htons((vid << VLAN_VID_SHIFT) |
                                    (pcp << VLAN_PCP_SHIFT) |
                                    (cfi ? VLAN_CFI : 0)));
              if (mask) {
                  nl_msg_put_be16(mask, OVS_KEY_ATTR_VLAN, htons(UINT16_MAX));
              }
              return n;
          }
      }
  
      {
          int eth_type;
          int eth_type_mask;
          int n = -1;
  
          if (mask && sscanf(s, "eth_type(%i/%i)%n",
                     &eth_type, &eth_type_mask, &n) > 0 && n > 0) {
              if (eth_type != 0) {
                  nl_msg_put_be16(key, OVS_KEY_ATTR_ETHERTYPE, htons(eth_type));
              }
              nl_msg_put_be16(mask, OVS_KEY_ATTR_ETHERTYPE, htons(eth_type_mask));
              return n;
          } else if (sscanf(s, "eth_type(%i)%n", &eth_type, &n) > 0 && n > 0) {
              nl_msg_put_be16(key, OVS_KEY_ATTR_ETHERTYPE, htons(eth_type));
              if (mask) {
                  nl_msg_put_be16(mask, OVS_KEY_ATTR_ETHERTYPE,
                                  htons(UINT16_MAX));
              }
              return n;
          }
      }
  
      {
          int label, tc, ttl, bos;
          int label_mask, tc_mask, ttl_mask, bos_mask;
          int n = -1;
  
          if (mask && sscanf(s, "mpls(label=%"SCNi32"/%"SCNi32",tc=%i/%i,ttl=%i/%i,bos=%i/%i)%n",
                      &label, &label_mask, &tc, &tc_mask, &ttl, &ttl_mask, &bos, &bos_mask, &n) > 0 && n > 0) {
              struct ovs_key_mpls *mpls, *mpls_mask;
  
              mpls = nl_msg_put_unspec_uninit(key, OVS_KEY_ATTR_MPLS,
                                              sizeof *mpls);
              mpls->mpls_lse = mpls_lse_from_components(label, tc, ttl, bos);
  
              mpls_mask = nl_msg_put_unspec_uninit(mask, OVS_KEY_ATTR_MPLS,
                                              sizeof *mpls_mask);
              mpls_mask->mpls_lse = mpls_lse_from_components(
                                    label_mask, tc_mask, ttl_mask, bos_mask);
              return n;
          } else if (sscanf(s, "mpls(label=%"SCNi32",tc=%i,ttl=%i,bos=%i)%n",
                      &label, &tc, &ttl, &bos, &n) > 0 &&
                      n > 0) {
              struct ovs_key_mpls *mpls;
  
              mpls = nl_msg_put_unspec_uninit(key, OVS_KEY_ATTR_MPLS,
                                              sizeof *mpls);
              mpls->mpls_lse = mpls_lse_from_components(label, tc, ttl, bos);
              if (mask) {
                  mpls = nl_msg_put_unspec_uninit(mask, OVS_KEY_ATTR_MPLS,
                                              sizeof *mpls);
                  mpls->mpls_lse = htonl(UINT32_MAX);
              }
              return n;
          }
      }
  
  
      {
          ovs_be32 ipv4_src, ipv4_src_mask;
          ovs_be32 ipv4_dst, ipv4_dst_mask;
          int ipv4_proto, ipv4_proto_mask;
          int ipv4_tos, ipv4_tos_mask;
          int ipv4_ttl, ipv4_ttl_mask;
          char frag[8];
          int  ipv4_frag_mask;
          enum ovs_frag_type ipv4_frag;
          int n = -1;
  
          if (mask && sscanf(s, "ipv4(src="IP_SCAN_FMT"/"IP_SCAN_FMT","
                        "dst="IP_SCAN_FMT"/"IP_SCAN_FMT","
                        "proto=%i/%i,tos=%i/%i,ttl=%i/%i,"
                        "frag=%7[a-z]/%i)%n",
                        IP_SCAN_ARGS(&ipv4_src), IP_SCAN_ARGS(&ipv4_src_mask),
                        IP_SCAN_ARGS(&ipv4_dst), IP_SCAN_ARGS(&ipv4_dst_mask),
                        &ipv4_proto, &ipv4_proto_mask,
                        &ipv4_tos, &ipv4_tos_mask, &ipv4_ttl, &ipv4_ttl_mask,
                        frag, &ipv4_frag_mask, &n) > 0
              && n > 0
              && ovs_frag_type_from_string(frag, &ipv4_frag)) {
              struct ovs_key_ipv4 ipv4_key;
              struct ovs_key_ipv4 ipv4_mask;
  
              ipv4_key.ipv4_src = ipv4_src;
              ipv4_key.ipv4_dst = ipv4_dst;
              ipv4_key.ipv4_proto = ipv4_proto;
              ipv4_key.ipv4_tos = ipv4_tos;
              ipv4_key.ipv4_ttl = ipv4_ttl;
              ipv4_key.ipv4_frag = ipv4_frag;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV4,
                                &ipv4_key, sizeof ipv4_key);
  
              ipv4_mask.ipv4_src = ipv4_src_mask;
              ipv4_mask.ipv4_dst = ipv4_dst_mask;
              ipv4_mask.ipv4_proto = ipv4_proto_mask;
              ipv4_mask.ipv4_tos = ipv4_tos_mask;
              ipv4_mask.ipv4_ttl = ipv4_ttl_mask;
              ipv4_mask.ipv4_frag = ipv4_frag_mask;
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_IPV4,
                                &ipv4_mask, sizeof ipv4_mask);
              return n;
          } else if (sscanf(s, "ipv4(src="IP_SCAN_FMT",dst="IP_SCAN_FMT","
                     "proto=%i,tos=%i,ttl=%i,frag=%7[a-z])%n",
                     IP_SCAN_ARGS(&ipv4_src), IP_SCAN_ARGS(&ipv4_dst),
                     &ipv4_proto, &ipv4_tos, &ipv4_ttl, frag, &n) > 0
              && n > 0
              && ovs_frag_type_from_string(frag, &ipv4_frag)) {
              struct ovs_key_ipv4 ipv4_key;
  
              ipv4_key.ipv4_src = ipv4_src;
              ipv4_key.ipv4_dst = ipv4_dst;
              ipv4_key.ipv4_proto = ipv4_proto;
              ipv4_key.ipv4_tos = ipv4_tos;
              ipv4_key.ipv4_ttl = ipv4_ttl;
              ipv4_key.ipv4_frag = ipv4_frag;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV4,
                                &ipv4_key, sizeof ipv4_key);
  
              if (mask) {
                  memset(&ipv4_key, 0xff, sizeof ipv4_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_IPV4,
                                &ipv4_key, sizeof ipv4_key);
              }
              return n;
          }
      }
  
      {
          char ipv6_src_s[IPV6_SCAN_LEN + 1];
          char ipv6_src_mask_s[IPV6_SCAN_LEN + 1];
          char ipv6_dst_s[IPV6_SCAN_LEN + 1];
          char ipv6_dst_mask_s[IPV6_SCAN_LEN + 1];
          int ipv6_label, ipv6_label_mask;
          int ipv6_proto, ipv6_proto_mask;
          int ipv6_tclass, ipv6_tclass_mask;
          int ipv6_hlimit, ipv6_hlimit_mask;
          char frag[8];
          enum ovs_frag_type ipv6_frag;
          int ipv6_frag_mask;
          int n = -1;
  
          if (mask && sscanf(s, "ipv6(src="IPV6_SCAN_FMT"/"IPV6_SCAN_FMT",dst="
                     IPV6_SCAN_FMT"/"IPV6_SCAN_FMT","
                     "label=%i/%i,proto=%i/%i,tclass=%i/%i,"
                     "hlimit=%i/%i,frag=%7[a-z]/%i)%n",
                     ipv6_src_s, ipv6_src_mask_s, ipv6_dst_s, ipv6_dst_mask_s,
                     &ipv6_label, &ipv6_label_mask, &ipv6_proto,
                     &ipv6_proto_mask, &ipv6_tclass, &ipv6_tclass_mask,
                     &ipv6_hlimit, &ipv6_hlimit_mask, frag,
                     &ipv6_frag_mask, &n) > 0
              && n > 0
              && ovs_frag_type_from_string(frag, &ipv6_frag)) {
              struct ovs_key_ipv6 ipv6_key;
              struct ovs_key_ipv6 ipv6_mask;
  
              if (inet_pton(AF_INET6, ipv6_src_s, &ipv6_key.ipv6_src) != 1 ||
                  inet_pton(AF_INET6, ipv6_dst_s, &ipv6_key.ipv6_dst) != 1 ||
                  inet_pton(AF_INET6, ipv6_src_mask_s, &ipv6_mask.ipv6_src) != 1 ||
                  inet_pton(AF_INET6, ipv6_dst_mask_s, &ipv6_mask.ipv6_dst) != 1) {
                  return -EINVAL;
              }
  
              ipv6_key.ipv6_label = htonl(ipv6_label);
              ipv6_key.ipv6_proto = ipv6_proto;
              ipv6_key.ipv6_tclass = ipv6_tclass;
              ipv6_key.ipv6_hlimit = ipv6_hlimit;
              ipv6_key.ipv6_frag = ipv6_frag;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV6,
                                &ipv6_key, sizeof ipv6_key);
  
              ipv6_mask.ipv6_label = htonl(ipv6_label_mask);
              ipv6_mask.ipv6_proto = ipv6_proto_mask;
              ipv6_mask.ipv6_tclass = ipv6_tclass_mask;
              ipv6_mask.ipv6_hlimit = ipv6_hlimit_mask;
              ipv6_mask.ipv6_frag = ipv6_frag_mask;
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_IPV6,
                                &ipv6_mask, sizeof ipv6_mask);
              return n;
          } else if (sscanf(s, "ipv6(src="IPV6_SCAN_FMT",dst="IPV6_SCAN_FMT","
                     "label=%i,proto=%i,tclass=%i,hlimit=%i,frag=%7[a-z])%n",
                     ipv6_src_s, ipv6_dst_s, &ipv6_label,
                     &ipv6_proto, &ipv6_tclass, &ipv6_hlimit, frag, &n) > 0
              && n > 0
              && ovs_frag_type_from_string(frag, &ipv6_frag)) {
              struct ovs_key_ipv6 ipv6_key;
  
              if (inet_pton(AF_INET6, ipv6_src_s, &ipv6_key.ipv6_src) != 1 ||
                  inet_pton(AF_INET6, ipv6_dst_s, &ipv6_key.ipv6_dst) != 1) {
                  return -EINVAL;
              }
              ipv6_key.ipv6_label = htonl(ipv6_label);
              ipv6_key.ipv6_proto = ipv6_proto;
              ipv6_key.ipv6_tclass = ipv6_tclass;
              ipv6_key.ipv6_hlimit = ipv6_hlimit;
              ipv6_key.ipv6_frag = ipv6_frag;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV6,
                                &ipv6_key, sizeof ipv6_key);
  
              if (mask) {
                  memset(&ipv6_key, 0xff, sizeof ipv6_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_IPV6,
                                &ipv6_key, sizeof ipv6_key);
              }
              return n;
          }
      }
  
      {
          int tcp_src;
          int tcp_dst;
          int tcp_src_mask;
          int tcp_dst_mask;
          int n = -1;
  
          if (mask && sscanf(s, "tcp(src=%i/%i,dst=%i/%i)%n",
                     &tcp_src, &tcp_src_mask, &tcp_dst, &tcp_dst_mask, &n) > 0
              && n > 0) {
              struct ovs_key_tcp tcp_key;
              struct ovs_key_tcp tcp_mask;
  
              tcp_key.tcp_src = htons(tcp_src);
              tcp_key.tcp_dst = htons(tcp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_TCP, &tcp_key, sizeof tcp_key);
  
              tcp_mask.tcp_src = htons(tcp_src_mask);
              tcp_mask.tcp_dst = htons(tcp_dst_mask);
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_TCP,
                                &tcp_mask, sizeof tcp_mask);
              return n;
          } else if (sscanf(s, "tcp(src=%i,dst=%i)%n",&tcp_src, &tcp_dst, &n) > 0
              && n > 0) {
              struct ovs_key_tcp tcp_key;
  
              tcp_key.tcp_src = htons(tcp_src);
              tcp_key.tcp_dst = htons(tcp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_TCP, &tcp_key, sizeof tcp_key);
  
              if (mask) {
                  memset(&tcp_key, 0xff, sizeof tcp_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_TCP,
                                &tcp_key, sizeof tcp_key);
              }
              return n;
          }
      }
  
      {
          int udp_src;
          int udp_dst;
          int udp_src_mask;
          int udp_dst_mask;
          int n = -1;
  
          if (mask && sscanf(s, "udp(src=%i/%i,dst=%i/%i)%n",
                     &udp_src, &udp_src_mask,
                     &udp_dst, &udp_dst_mask, &n) > 0 && n > 0) {
              struct ovs_key_udp udp_key;
              struct ovs_key_udp udp_mask;
  
              udp_key.udp_src = htons(udp_src);
              udp_key.udp_dst = htons(udp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_UDP, &udp_key, sizeof udp_key);
  
              udp_mask.udp_src = htons(udp_src_mask);
              udp_mask.udp_dst = htons(udp_dst_mask);
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_UDP,
                                &udp_mask, sizeof udp_mask);
              return n;
          }
          if (sscanf(s, "udp(src=%i,dst=%i)%n", &udp_src, &udp_dst, &n) > 0
              && n > 0) {
              struct ovs_key_udp udp_key;
  
              udp_key.udp_src = htons(udp_src);
              udp_key.udp_dst = htons(udp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_UDP, &udp_key, sizeof udp_key);
  
              if (mask) {
                  memset(&udp_key, 0xff, sizeof udp_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_UDP, &udp_key, sizeof udp_key);
              }
              return n;
          }
      }
  
      {
          int sctp_src;
          int sctp_dst;
          int sctp_src_mask;
          int sctp_dst_mask;
          int n = -1;
  
          if (mask && sscanf(s, "sctp(src=%i/%i,dst=%i/%i)%n",
                     &sctp_src, &sctp_src_mask,
                     &sctp_dst, &sctp_dst_mask, &n) > 0 && n > 0) {
              struct ovs_key_sctp sctp_key;
              struct ovs_key_sctp sctp_mask;
  
              sctp_key.sctp_src = htons(sctp_src);
              sctp_key.sctp_dst = htons(sctp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_SCTP, &sctp_key, sizeof sctp_key);
  
              sctp_mask.sctp_src = htons(sctp_src_mask);
              sctp_mask.sctp_dst = htons(sctp_dst_mask);
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_SCTP,
                                &sctp_mask, sizeof sctp_mask);
              return n;
          }
          if (sscanf(s, "sctp(src=%i,dst=%i)%n", &sctp_src, &sctp_dst, &n) > 0
              && n > 0) {
              struct ovs_key_sctp sctp_key;
  
              sctp_key.sctp_src = htons(sctp_src);
              sctp_key.sctp_dst = htons(sctp_dst);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_SCTP, &sctp_key, sizeof sctp_key);
  
              if (mask) {
                  memset(&sctp_key, 0xff, sizeof sctp_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_SCTP, &sctp_key, sizeof sctp_key);
              }
              return n;
          }
      }
  
      {
          int icmp_type;
          int icmp_code;
          int icmp_type_mask;
          int icmp_code_mask;
          int n = -1;
  
          if (mask && sscanf(s, "icmp(type=%i/%i,code=%i/%i)%n",
                     &icmp_type, &icmp_type_mask,
                     &icmp_code, &icmp_code_mask, &n) > 0 && n > 0) {
              struct ovs_key_icmp icmp_key;
              struct ovs_key_icmp icmp_mask;
  
              icmp_key.icmp_type = icmp_type;
              icmp_key.icmp_code = icmp_code;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMP,
                                &icmp_key, sizeof icmp_key);
  
              icmp_mask.icmp_type = icmp_type_mask;
              icmp_mask.icmp_code = icmp_code_mask;
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_ICMP,
                                &icmp_mask, sizeof icmp_mask);
              return n;
          } else if (sscanf(s, "icmp(type=%i,code=%i)%n",
                     &icmp_type, &icmp_code, &n) > 0
              && n > 0) {
              struct ovs_key_icmp icmp_key;
  
              icmp_key.icmp_type = icmp_type;
              icmp_key.icmp_code = icmp_code;
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMP,
                                &icmp_key, sizeof icmp_key);
              if (mask) {
                  memset(&icmp_key, 0xff, sizeof icmp_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_ICMP, &icmp_key,
                                sizeof icmp_key);
              }
              return n;
          }
      }
  
      {
          struct ovs_key_icmpv6 icmpv6_key;
          struct ovs_key_icmpv6 icmpv6_mask;
          int icmpv6_type_mask;
          int icmpv6_code_mask;
          int n = -1;
  
          if (mask && sscanf(s, "icmpv6(type=%"SCNi8"/%i,code=%"SCNi8"/%i)%n",
                     &icmpv6_key.icmpv6_type, &icmpv6_type_mask,
                     &icmpv6_key.icmpv6_code, &icmpv6_code_mask, &n) > 0
              && n > 0) {
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMPV6,
                                &icmpv6_key, sizeof icmpv6_key);
  
              icmpv6_mask.icmpv6_type = icmpv6_type_mask;
              icmpv6_mask.icmpv6_code = icmpv6_code_mask;
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_ICMPV6, &icmpv6_mask,
                                sizeof icmpv6_mask);
              return n;
          } else if (sscanf(s, "icmpv6(type=%"SCNi8",code=%"SCNi8")%n",
                     &icmpv6_key.icmpv6_type, &icmpv6_key.icmpv6_code,&n) > 0
              && n > 0) {
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMPV6,
                                &icmpv6_key, sizeof icmpv6_key);
  
              if (mask) {
                  memset(&icmpv6_key, 0xff, sizeof icmpv6_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_ICMPV6, &icmpv6_key,
                                sizeof icmpv6_key);
              }
              return n;
          }
      }
  
      {
          ovs_be32 arp_sip, arp_sip_mask;
          ovs_be32 arp_tip, arp_tip_mask;
          int arp_op, arp_op_mask;
          uint8_t arp_sha[ETH_ADDR_LEN];
          uint8_t arp_sha_mask[ETH_ADDR_LEN];
          uint8_t arp_tha[ETH_ADDR_LEN];
          uint8_t arp_tha_mask[ETH_ADDR_LEN];
          int n = -1;
  
          if (mask && sscanf(s, "arp(sip="IP_SCAN_FMT"/"IP_SCAN_FMT","
                     "tip="IP_SCAN_FMT"/"IP_SCAN_FMT","
                     "op=%i/%i,sha="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT","
                     "tha="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT")%n",
                     IP_SCAN_ARGS(&arp_sip), IP_SCAN_ARGS(&arp_sip_mask),
                     IP_SCAN_ARGS(&arp_tip), IP_SCAN_ARGS(&arp_tip_mask),
                     &arp_op, &arp_op_mask,
                     ETH_ADDR_SCAN_ARGS(arp_sha),
                     ETH_ADDR_SCAN_ARGS(arp_sha_mask),
                     ETH_ADDR_SCAN_ARGS(arp_tha),
                     ETH_ADDR_SCAN_ARGS(arp_tha_mask), &n) > 0 && n > 0) {
              struct ovs_key_arp arp_key;
              struct ovs_key_arp arp_mask;
  
              memset(&arp_key, 0, sizeof arp_key);
              arp_key.arp_sip = arp_sip;
              arp_key.arp_tip = arp_tip;
              arp_key.arp_op = htons(arp_op);
              memcpy(arp_key.arp_sha, arp_sha, ETH_ADDR_LEN);
              memcpy(arp_key.arp_tha, arp_tha, ETH_ADDR_LEN);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ARP, &arp_key, sizeof arp_key);
  
              arp_mask.arp_sip = arp_sip_mask;
              arp_mask.arp_tip = arp_tip_mask;
              arp_mask.arp_op = htons(arp_op_mask);
              memcpy(arp_mask.arp_sha, arp_sha_mask, ETH_ADDR_LEN);
              memcpy(arp_mask.arp_tha, arp_tha_mask, ETH_ADDR_LEN);
              nl_msg_put_unspec(mask, OVS_KEY_ATTR_ARP,
                                &arp_mask, sizeof arp_mask);
              return n;
          } else if (sscanf(s, "arp(sip="IP_SCAN_FMT",tip="IP_SCAN_FMT","
                     "op=%i,sha="ETH_ADDR_SCAN_FMT",tha="ETH_ADDR_SCAN_FMT")%n",
                     IP_SCAN_ARGS(&arp_sip),
                     IP_SCAN_ARGS(&arp_tip),
                     &arp_op,
                     ETH_ADDR_SCAN_ARGS(arp_sha),
                     ETH_ADDR_SCAN_ARGS(arp_tha), &n) > 0 && n > 0) {
              struct ovs_key_arp arp_key;
  
              memset(&arp_key, 0, sizeof arp_key);
              arp_key.arp_sip = arp_sip;
              arp_key.arp_tip = arp_tip;
              arp_key.arp_op = htons(arp_op);
              memcpy(arp_key.arp_sha, arp_sha, ETH_ADDR_LEN);
              memcpy(arp_key.arp_tha, arp_tha, ETH_ADDR_LEN);
              nl_msg_put_unspec(key, OVS_KEY_ATTR_ARP, &arp_key, sizeof arp_key);
  
              if (mask) {
                  memset(&arp_key, 0xff, sizeof arp_key);
                  nl_msg_put_unspec(mask, OVS_KEY_ATTR_ARP,
                                    &arp_key, sizeof arp_key);
              }
              return n;
          }
      }
  
      {
          char nd_target_s[IPV6_SCAN_LEN + 1];
          char nd_target_mask_s[IPV6_SCAN_LEN + 1];
          uint8_t nd_sll[ETH_ADDR_LEN];
          uint8_t nd_sll_mask[ETH_ADDR_LEN];
          uint8_t nd_tll[ETH_ADDR_LEN];
          uint8_t nd_tll_mask[ETH_ADDR_LEN];
          int n = -1;
  
          nd_target_mask_s[0] = 0;
          memset(nd_sll_mask, 0xff, sizeof nd_sll_mask);
          memset(nd_tll_mask, 0xff, sizeof nd_tll_mask);
  
          if (mask && sscanf(s, "nd(target="IPV6_SCAN_FMT"/"IPV6_SCAN_FMT")%n",
                     nd_target_s, nd_target_mask_s, &n) > 0 && n > 0) {
                  put_nd_key(n, nd_target_s, NULL, NULL, key);
                  put_nd_mask(n, nd_target_mask_s, NULL, NULL, mask);
          } else if (sscanf(s, "nd(target="IPV6_SCAN_FMT")%n",
                     nd_target_s, &n) > 0 && n > 0) {
                  put_nd_key(n, nd_target_s, NULL, NULL, key);
                  if (mask) {
                      put_nd_mask(n, nd_target_mask_s, NULL, NULL, mask);
                  }
          } else if (mask && sscanf(s, "nd(target="IPV6_SCAN_FMT"/"IPV6_SCAN_FMT
                           ",sll="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, nd_target_mask_s,
                     ETH_ADDR_SCAN_ARGS(nd_sll),
                     ETH_ADDR_SCAN_ARGS(nd_sll_mask), &n) > 0 && n > 0) {
              put_nd_key(n, nd_target_s, nd_sll, NULL, key);
              put_nd_mask(n, nd_target_mask_s, nd_sll_mask, NULL, mask);
          } else if (sscanf(s, "nd(target="IPV6_SCAN_FMT",sll="ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, ETH_ADDR_SCAN_ARGS(nd_sll), &n) > 0
              && n > 0) {
              put_nd_key(n, nd_target_s, nd_sll, NULL, key);
              if (mask) {
                  put_nd_mask(n, nd_target_mask_s, nd_sll_mask, NULL, mask);
              }
          } else if (mask && sscanf(s, "nd(target="IPV6_SCAN_FMT"/"IPV6_SCAN_FMT
                           ",tll="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, nd_target_mask_s,
                     ETH_ADDR_SCAN_ARGS(nd_tll),
                     ETH_ADDR_SCAN_ARGS(nd_tll_mask), &n) > 0 && n > 0) {
              put_nd_key(n, nd_target_s, NULL, nd_tll, key);
              put_nd_mask(n, nd_target_mask_s, NULL, nd_tll_mask, mask);
          } else if (sscanf(s, "nd(target="IPV6_SCAN_FMT",tll="ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, ETH_ADDR_SCAN_ARGS(nd_tll), &n) > 0
              && n > 0) {
              put_nd_key(n, nd_target_s, NULL, nd_tll, key);
              if (mask) {
                  put_nd_mask(n, nd_target_mask_s, NULL, nd_tll_mask, mask);
              }
          } else if (mask && sscanf(s, "nd(target="IPV6_SCAN_FMT"/"IPV6_SCAN_FMT
                     ",sll="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT","
                     "tll="ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, nd_target_mask_s,
                     ETH_ADDR_SCAN_ARGS(nd_sll), ETH_ADDR_SCAN_ARGS(nd_sll_mask),
                     ETH_ADDR_SCAN_ARGS(nd_tll), ETH_ADDR_SCAN_ARGS(nd_tll_mask),
                     &n) > 0
              && n > 0) {
              put_nd_key(n, nd_target_s, nd_sll, nd_tll, key);
              put_nd_mask(n, nd_target_mask_s, nd_sll_mask, nd_tll_mask, mask);
          } else if (sscanf(s, "nd(target="IPV6_SCAN_FMT",sll="ETH_ADDR_SCAN_FMT","
                     "tll="ETH_ADDR_SCAN_FMT")%n",
                     nd_target_s, ETH_ADDR_SCAN_ARGS(nd_sll),
                     ETH_ADDR_SCAN_ARGS(nd_tll), &n) > 0
              && n > 0) {
              put_nd_key(n, nd_target_s, nd_sll, nd_tll, key);
              if (mask) {
                  put_nd_mask(n, nd_target_mask_s,
                              nd_sll_mask, nd_tll_mask, mask);
              }
          }
  
          if (n != -1)
              return n;
  
      }
  
      if (!strncmp(s, "encap(", 6)) {
          const char *start = s;
          size_t encap, encap_mask = 0;
  
          encap = nl_msg_start_nested(key, OVS_KEY_ATTR_ENCAP);
          if (mask) {
              encap_mask = nl_msg_start_nested(mask, OVS_KEY_ATTR_ENCAP);
          }
  
          s += 6;
          for (;;) {
              int retval;
  
              s += strspn(s, ", \t\r\n");
              if (!*s) {
                  return -EINVAL;
              } else if (*s == ')') {
                  break;
              }
  
              retval = parse_odp_key_mask_attr(s, port_names, key, mask);
              if (retval < 0) {
                  return retval;
              }
              s += retval;
          }
          s++;
  
          nl_msg_end_nested(key, encap);
          if (mask) {
              nl_msg_end_nested(mask, encap_mask);
          }
  
          return s - start;
      }
  
      return -EINVAL;
  }
  
  /* Parses the string representation of a datapath flow key, in the
   * format output by odp_flow_key_format().  Returns 0 if successful,
   * otherwise a positive errno value.  On success, the flow key is
   * appended to 'key' as a series of Netlink attributes.  On failure, no
   * data is appended to 'key'.  Either way, 'key''s data might be
   * reallocated.
   *
   * If 'port_names' is nonnull, it points to an simap that maps from a port name
   * to a port number.  (Port names may be used instead of port numbers in
   * in_port.)
   *
   * On success, the attributes appended to 'key' are individually syntactically
   * valid, but they may not be valid as a sequence.  'key' might, for example,
   * have duplicated keys.  odp_flow_key_to_flow() will detect those errors. */
  int
  odp_flow_from_string(const char *s, const struct simap *port_names,
                       struct ofpbuf *key, struct ofpbuf *mask)
  {
      const size_t old_size = key->size;
      for (;;) {
          int retval;
  
          s += strspn(s, delimiters);
          if (!*s) {
              return 0;
          }
  
          retval = parse_odp_key_mask_attr(s, port_names, key, mask);
          if (retval < 0) {
              key->size = old_size;
              return -retval;
          }
          s += retval;
      }
  
      return 0;
  }
  
  static uint8_t
  ovs_to_odp_frag(uint8_t nw_frag)
  {
      return (nw_frag == 0 ? OVS_FRAG_TYPE_NONE
            : nw_frag == FLOW_NW_FRAG_ANY ? OVS_FRAG_TYPE_FIRST
            : OVS_FRAG_TYPE_LATER);
  }
  
  static uint8_t
  ovs_to_odp_frag_mask(uint8_t nw_frag_mask)
  {
      uint8_t frag_mask = ~(OVS_FRAG_TYPE_FIRST | OVS_FRAG_TYPE_LATER);
  
      frag_mask |= (nw_frag_mask & FLOW_NW_FRAG_ANY) ? OVS_FRAG_TYPE_FIRST : 0;
      frag_mask |= (nw_frag_mask & FLOW_NW_FRAG_LATER) ? OVS_FRAG_TYPE_LATER : 0;
  
      return frag_mask;
  }
  
  static void
  odp_flow_key_from_flow__(struct ofpbuf *buf, const struct flow *data,
                           const struct flow *flow, odp_port_t odp_in_port)
  {
      bool is_mask;
      struct ovs_key_ethernet *eth_key;
      size_t encap;
  
      /* We assume that if 'data' and 'flow' are not the same, we should
       * treat 'data' as a mask. */
      is_mask = (data != flow);
  
      nl_msg_put_u32(buf, OVS_KEY_ATTR_PRIORITY, data->skb_priority);
  
      if (flow->tunnel.ip_dst || is_mask) {
          tun_key_to_attr(buf, &data->tunnel);
      }
  
      nl_msg_put_u32(buf, OVS_KEY_ATTR_SKB_MARK, data->pkt_mark);
  
      /* Add an ingress port attribute if this is a mask or 'odp_in_port'
       * is not the magical value "ODPP_NONE". */
      if (is_mask || odp_in_port != ODPP_NONE) {
          nl_msg_put_odp_port(buf, OVS_KEY_ATTR_IN_PORT, odp_in_port);
      }
  
      eth_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ETHERNET,
                                         sizeof *eth_key);
      memcpy(eth_key->eth_src, data->dl_src, ETH_ADDR_LEN);
      memcpy(eth_key->eth_dst, data->dl_dst, ETH_ADDR_LEN);
  
      if (flow->vlan_tci != htons(0) || flow->dl_type == htons(ETH_TYPE_VLAN)) {
          if (is_mask) {
              nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, htons(UINT16_MAX));
          } else {
              nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_TYPE_VLAN));
          }
          nl_msg_put_be16(buf, OVS_KEY_ATTR_VLAN, data->vlan_tci);
          encap = nl_msg_start_nested(buf, OVS_KEY_ATTR_ENCAP);
          if (flow->vlan_tci == htons(0)) {
              goto unencap;
          }
      } else {
          encap = 0;
      }
  
      if (ntohs(flow->dl_type) < ETH_TYPE_MIN) {
          /* For backwards compatibility with kernels that don't support
           * wildcarding, the following convention is used to encode the
           * OVS_KEY_ATTR_ETHERTYPE for key and mask:
           *
           *   key      mask    matches
           * -------- --------  -------
           *  >0x5ff   0xffff   Specified Ethernet II Ethertype.
           *  >0x5ff      0     Any Ethernet II or non-Ethernet II frame.
           *  <none>   0xffff   Any non-Ethernet II frame (except valid
           *                    802.3 SNAP packet with valid eth_type).
           */
          if (is_mask) {
              nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, htons(UINT16_MAX));
          }
          goto unencap;
      }
  
      nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, data->dl_type);
  
      if (flow->dl_type == htons(ETH_TYPE_IP)) {
          struct ovs_key_ipv4 *ipv4_key;
  
          ipv4_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_IPV4,
                                              sizeof *ipv4_key);
          ipv4_key->ipv4_src = data->nw_src;
          ipv4_key->ipv4_dst = data->nw_dst;
          ipv4_key->ipv4_proto = data->nw_proto;
          ipv4_key->ipv4_tos = data->nw_tos;
          ipv4_key->ipv4_ttl = data->nw_ttl;
          ipv4_key->ipv4_frag = is_mask ? ovs_to_odp_frag_mask(data->nw_frag)
                                        : ovs_to_odp_frag(data->nw_frag);
      } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
          struct ovs_key_ipv6 *ipv6_key;
  
          ipv6_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_IPV6,
                                              sizeof *ipv6_key);
          memcpy(ipv6_key->ipv6_src, &data->ipv6_src, sizeof ipv6_key->ipv6_src);
          memcpy(ipv6_key->ipv6_dst, &data->ipv6_dst, sizeof ipv6_key->ipv6_dst);
          ipv6_key->ipv6_label = data->ipv6_label;
          ipv6_key->ipv6_proto = data->nw_proto;
          ipv6_key->ipv6_tclass = data->nw_tos;
          ipv6_key->ipv6_hlimit = data->nw_ttl;
          ipv6_key->ipv6_frag = is_mask ? ovs_to_odp_frag_mask(data->nw_frag)
                                        : ovs_to_odp_frag(data->nw_frag);
      } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
                 flow->dl_type == htons(ETH_TYPE_RARP)) {
          struct ovs_key_arp *arp_key;
  
          arp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ARP,
                                             sizeof *arp_key);
          memset(arp_key, 0, sizeof *arp_key);
          arp_key->arp_sip = data->nw_src;
          arp_key->arp_tip = data->nw_dst;
          arp_key->arp_op = htons(data->nw_proto);
          memcpy(arp_key->arp_sha, data->arp_sha, ETH_ADDR_LEN);
          memcpy(arp_key->arp_tha, data->arp_tha, ETH_ADDR_LEN);
      }
  
      if (flow->mpls_depth) {
          struct ovs_key_mpls *mpls_key;
  
          mpls_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_MPLS,
                                              sizeof *mpls_key);
          mpls_key->mpls_lse = data->mpls_lse;
      }
  
      if (is_ip_any(flow) && !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (flow->nw_proto == IPPROTO_TCP) {
              struct ovs_key_tcp *tcp_key;
  
              tcp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_TCP,
                                                 sizeof *tcp_key);
              tcp_key->tcp_src = data->tp_src;
              tcp_key->tcp_dst = data->tp_dst;
          } else if (flow->nw_proto == IPPROTO_UDP) {
              struct ovs_key_udp *udp_key;
  
              udp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_UDP,
                                                 sizeof *udp_key);
              udp_key->udp_src = data->tp_src;
              udp_key->udp_dst = data->tp_dst;
          } else if (flow->nw_proto == IPPROTO_SCTP) {
              struct ovs_key_sctp *sctp_key;
  
              sctp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_SCTP,
                                                 sizeof *sctp_key);
              sctp_key->sctp_src = data->tp_src;
              sctp_key->sctp_dst = data->tp_dst;
          } else if (flow->dl_type == htons(ETH_TYPE_IP)
                  && flow->nw_proto == IPPROTO_ICMP) {
              struct ovs_key_icmp *icmp_key;
  
              icmp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ICMP,
                                                  sizeof *icmp_key);
              icmp_key->icmp_type = ntohs(data->tp_src);
              icmp_key->icmp_code = ntohs(data->tp_dst);
          } else if (flow->dl_type == htons(ETH_TYPE_IPV6)
                  && flow->nw_proto == IPPROTO_ICMPV6) {
              struct ovs_key_icmpv6 *icmpv6_key;
  
              icmpv6_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ICMPV6,
                                                    sizeof *icmpv6_key);
              icmpv6_key->icmpv6_type = ntohs(data->tp_src);
              icmpv6_key->icmpv6_code = ntohs(data->tp_dst);
  
              if (flow->tp_dst == htons(0) &&
                  (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
                   flow->tp_src == htons(ND_NEIGHBOR_ADVERT)) &&
                  (!is_mask || (data->tp_src == htons(0xffff) &&
                                data->tp_dst == htons(0xffff)))) {
  
                  struct ovs_key_nd *nd_key;
  
                  nd_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ND,
                                                      sizeof *nd_key);
                  memcpy(nd_key->nd_target, &data->nd_target,
                          sizeof nd_key->nd_target);
                  memcpy(nd_key->nd_sll, data->arp_sha, ETH_ADDR_LEN);
                  memcpy(nd_key->nd_tll, data->arp_tha, ETH_ADDR_LEN);
              }
          }
      }
  
  unencap:
      if (encap) {
          nl_msg_end_nested(buf, encap);
      }
  }
  
  /* Appends a representation of 'flow' as OVS_KEY_ATTR_* attributes to 'buf'.
   * 'flow->in_port' is ignored (since it is likely to be an OpenFlow port
   * number rather than a datapath port number).  Instead, if 'odp_in_port'
   * is anything other than ODPP_NONE, it is included in 'buf' as the input
   * port.
   *
   * 'buf' must have at least ODPUTIL_FLOW_KEY_BYTES bytes of space, or be
   * capable of being expanded to allow for that much space. */
  void
  odp_flow_key_from_flow(struct ofpbuf *buf, const struct flow *flow,
                         odp_port_t odp_in_port)
  {
      odp_flow_key_from_flow__(buf, flow, flow, odp_in_port);
  }
  
  /* Appends a representation of 'mask' as OVS_KEY_ATTR_* attributes to
   * 'buf'.  'flow' is used as a template to determine how to interpret
   * 'mask'.  For example, the 'dl_type' of 'mask' describes the mask, but
   * it doesn't indicate whether the other fields should be interpreted as
   * ARP, IPv4, IPv6, etc.
   *
   * 'buf' must have at least ODPUTIL_FLOW_KEY_BYTES bytes of space, or be
   * capable of being expanded to allow for that much space. */
  void
  odp_flow_key_from_mask(struct ofpbuf *buf, const struct flow *mask,
                         const struct flow *flow, uint32_t odp_in_port_mask)
  {
      odp_flow_key_from_flow__(buf, mask, flow, u32_to_odp(odp_in_port_mask));
  }
  
  uint32_t
  odp_flow_key_hash(const struct nlattr *key, size_t key_len)
  {
      BUILD_ASSERT_DECL(!(NLA_ALIGNTO % sizeof(uint32_t)));
      return hash_words(ALIGNED_CAST(const uint32_t *, key),
                        key_len / sizeof(uint32_t), 0);
  }
  
  static void
  log_odp_key_attributes(struct vlog_rate_limit *rl, const char *title,
                         uint64_t attrs, int out_of_range_attr,
                         const struct nlattr *key, size_t key_len)
  {
      struct ds s;
      int i;
  
      if (VLOG_DROP_DBG(rl)) {
          return;
      }
  
      ds_init(&s);
      for (i = 0; i < 64; i++) {
          if (attrs & (UINT64_C(1) << i)) {
              char namebuf[OVS_KEY_ATTR_BUFSIZE];
  
              ds_put_format(&s, " %s",
                            ovs_key_attr_to_string(i, namebuf, sizeof namebuf));
          }
      }
      if (out_of_range_attr) {
          ds_put_format(&s, " %d (and possibly others)", out_of_range_attr);
      }
  
      ds_put_cstr(&s, ": ");
      odp_flow_key_format(key, key_len, &s);
  
      VLOG_DBG("%s:%s", title, ds_cstr(&s));
      ds_destroy(&s);
  }
  
  static bool
  odp_to_ovs_frag(uint8_t odp_frag, struct flow *flow)
  {
      static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  
      if (odp_frag > OVS_FRAG_TYPE_LATER) {
          VLOG_ERR_RL(&rl, "invalid frag %"PRIu8" in flow key", odp_frag);
          return false;
      }
  
      if (odp_frag != OVS_FRAG_TYPE_NONE) {
          flow->nw_frag |= FLOW_NW_FRAG_ANY;
          if (odp_frag == OVS_FRAG_TYPE_LATER) {
              flow->nw_frag |= FLOW_NW_FRAG_LATER;
          }
      }
      return true;
  }
  
  static bool
  parse_flow_nlattrs(const struct nlattr *key, size_t key_len,
                     const struct nlattr *attrs[], uint64_t *present_attrsp,
                     int *out_of_range_attrp)
  {
      static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
      const struct nlattr *nla;
      uint64_t present_attrs;
      size_t left;
  
      BUILD_ASSERT(OVS_KEY_ATTR_MAX < CHAR_BIT * sizeof present_attrs);
      present_attrs = 0;
      *out_of_range_attrp = 0;
      NL_ATTR_FOR_EACH (nla, left, key, key_len) {
          uint16_t type = nl_attr_type(nla);
          size_t len = nl_attr_get_size(nla);
          int expected_len = odp_flow_key_attr_len(type);
  
          if (len != expected_len && expected_len >= 0) {
              char namebuf[OVS_KEY_ATTR_BUFSIZE];
  
              VLOG_ERR_RL(&rl, "attribute %s has length %zu but should have "
                          "length %d", ovs_key_attr_to_string(type, namebuf,
                                                              sizeof namebuf),
                          len, expected_len);
              return false;
          }
  
          if (type > OVS_KEY_ATTR_MAX) {
              *out_of_range_attrp = type;
          } else {
              if (present_attrs & (UINT64_C(1) << type)) {
                  char namebuf[OVS_KEY_ATTR_BUFSIZE];
  
                  VLOG_ERR_RL(&rl, "duplicate %s attribute in flow key",
                              ovs_key_attr_to_string(type,
                                                     namebuf, sizeof namebuf));
                  return false;
              }
  
              present_attrs |= UINT64_C(1) << type;
              attrs[type] = nla;
          }
      }
      if (left) {
          VLOG_ERR_RL(&rl, "trailing garbage in flow key");
          return false;
      }
  
      *present_attrsp = present_attrs;
      return true;
  }
  
  static enum odp_key_fitness
  check_expectations(uint64_t present_attrs, int out_of_range_attr,
                     uint64_t expected_attrs,
                     const struct nlattr *key, size_t key_len)
  {
      uint64_t missing_attrs;
      uint64_t extra_attrs;
  
      missing_attrs = expected_attrs & ~present_attrs;
      if (missing_attrs) {
          static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
          log_odp_key_attributes(&rl, "expected but not present",
                                 missing_attrs, 0, key, key_len);
          return ODP_FIT_TOO_LITTLE;
      }
  
      extra_attrs = present_attrs & ~expected_attrs;
      if (extra_attrs || out_of_range_attr) {
          static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
          log_odp_key_attributes(&rl, "present but not expected",
                                 extra_attrs, out_of_range_attr, key, key_len);
          return ODP_FIT_TOO_MUCH;
      }
  
      return ODP_FIT_PERFECT;
  }
  
  static bool
  parse_ethertype(const struct nlattr *attrs[OVS_KEY_ATTR_MAX + 1],
                  uint64_t present_attrs, uint64_t *expected_attrs,
                  struct flow *flow, const struct flow *src_flow)
  {
      static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
      bool is_mask = flow != src_flow;
  
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ETHERTYPE)) {
          flow->dl_type = nl_attr_get_be16(attrs[OVS_KEY_ATTR_ETHERTYPE]);
          if (!is_mask && ntohs(flow->dl_type) < ETH_TYPE_MIN) {
              VLOG_ERR_RL(&rl, "invalid Ethertype %"PRIu16" in flow key",
                          ntohs(flow->dl_type));
              return false;
          }
          if (is_mask && ntohs(src_flow->dl_type) < ETH_TYPE_MIN &&
              flow->dl_type != htons(0xffff)) {
              return false;
          }
          *expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ETHERTYPE;
      } else {
          if (!is_mask) {
              flow->dl_type = htons(FLOW_DL_TYPE_NONE);
          } else if (ntohs(src_flow->dl_type) < ETH_TYPE_MIN) {
              /* See comments in odp_flow_key_from_flow__(). */
              VLOG_ERR_RL(&rl, "mask expected for non-Ethernet II frame");
              return false;
          }
      }
      return true;
  }
  
  static enum odp_key_fitness
  parse_l2_5_onward(const struct nlattr *attrs[OVS_KEY_ATTR_MAX + 1],
                    uint64_t present_attrs, int out_of_range_attr,
                    uint64_t expected_attrs, struct flow *flow,
                    const struct nlattr *key, size_t key_len,
  		  const struct flow *src_flow)
  {
      static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
      bool is_mask = src_flow != flow;
      const void *check_start = NULL;
      size_t check_len = 0;
      enum ovs_key_attr expected_bit = 0xff;
  
      if (eth_type_mpls(src_flow->dl_type)) {
  	if (!is_mask) {
  	    expected_attrs |= (UINT64_C(1) << OVS_KEY_ATTR_MPLS);
  
  	    if (!(present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_MPLS))) {
  	        return ODP_FIT_TOO_LITTLE;
  	    }
  	    flow->mpls_lse = nl_attr_get_be32(attrs[OVS_KEY_ATTR_MPLS]);
  	    flow->mpls_depth++;
          } else if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_MPLS)) {
              flow->mpls_lse = nl_attr_get_be32(attrs[OVS_KEY_ATTR_MPLS]);
  
              if (flow->mpls_lse != 0 && flow->dl_type != htons(0xffff)) {
                  return ODP_FIT_ERROR;
              }
              expected_attrs |= (UINT64_C(1) << OVS_KEY_ATTR_MPLS);
              if (flow->mpls_lse) {
                  /* XXX Is this needed? */
                  flow->mpls_depth = 0xffff;
              }
          }
          goto done;
      } else if (src_flow->dl_type == htons(ETH_TYPE_IP)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_IPV4;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_IPV4)) {
              const struct ovs_key_ipv4 *ipv4_key;
  
              ipv4_key = nl_attr_get(attrs[OVS_KEY_ATTR_IPV4]);
              flow->nw_src = ipv4_key->ipv4_src;
              flow->nw_dst = ipv4_key->ipv4_dst;
              flow->nw_proto = ipv4_key->ipv4_proto;
              flow->nw_tos = ipv4_key->ipv4_tos;
              flow->nw_ttl = ipv4_key->ipv4_ttl;
              if (is_mask) {
  	        flow->nw_frag = ipv4_key->ipv4_frag;
                  check_start = ipv4_key;
                  check_len = sizeof *ipv4_key;
                  expected_bit = OVS_KEY_ATTR_IPV4;
              } else if (!odp_to_ovs_frag(ipv4_key->ipv4_frag, flow)) {
                  return ODP_FIT_ERROR;
              }
          }
      } else if (src_flow->dl_type == htons(ETH_TYPE_IPV6)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_IPV6;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_IPV6)) {
              const struct ovs_key_ipv6 *ipv6_key;
  
              ipv6_key = nl_attr_get(attrs[OVS_KEY_ATTR_IPV6]);
              memcpy(&flow->ipv6_src, ipv6_key->ipv6_src, sizeof flow->ipv6_src);
              memcpy(&flow->ipv6_dst, ipv6_key->ipv6_dst, sizeof flow->ipv6_dst);
              flow->ipv6_label = ipv6_key->ipv6_label;
              flow->nw_proto = ipv6_key->ipv6_proto;
              flow->nw_tos = ipv6_key->ipv6_tclass;
              flow->nw_ttl = ipv6_key->ipv6_hlimit;
              if (is_mask) {
  	        flow->nw_frag = ipv6_key->ipv6_frag;
                  check_start = ipv6_key;
                  check_len = sizeof *ipv6_key;
                  expected_bit = OVS_KEY_ATTR_IPV6;
              } else if (!odp_to_ovs_frag(ipv6_key->ipv6_frag, flow)) {
                  return ODP_FIT_ERROR;
              }
          }
      } else if (src_flow->dl_type == htons(ETH_TYPE_ARP) ||
                 src_flow->dl_type == htons(ETH_TYPE_RARP)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ARP;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ARP)) {
              const struct ovs_key_arp *arp_key;
  
              arp_key = nl_attr_get(attrs[OVS_KEY_ATTR_ARP]);
              flow->nw_src = arp_key->arp_sip;
              flow->nw_dst = arp_key->arp_tip;
              if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
                  VLOG_ERR_RL(&rl, "unsupported ARP opcode %"PRIu16" in flow "
                              "key", ntohs(arp_key->arp_op));
                  return ODP_FIT_ERROR;
              }
              flow->nw_proto = ntohs(arp_key->arp_op);
              memcpy(flow->arp_sha, arp_key->arp_sha, ETH_ADDR_LEN);
              memcpy(flow->arp_tha, arp_key->arp_tha, ETH_ADDR_LEN);
  
              if (is_mask) {
                  check_start = arp_key;
                  check_len = sizeof *arp_key;
                  expected_bit = OVS_KEY_ATTR_ARP;
              }
          }
      } else {
          goto done;
      }
      if (is_mask) {
          if (!is_all_zeros(check_start, check_len) &&
              flow->dl_type != htons(0xffff)) {
              return ODP_FIT_ERROR;
          } else {
              expected_attrs |= UINT64_C(1) << expected_bit;
          }
      }
  
      expected_bit = OVS_KEY_ATTR_UNSPEC;
      if (src_flow->nw_proto == IPPROTO_TCP
          && (src_flow->dl_type == htons(ETH_TYPE_IP) ||
              src_flow->dl_type == htons(ETH_TYPE_IPV6))
          && !(src_flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_TCP;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_TCP)) {
              const struct ovs_key_tcp *tcp_key;
  
              tcp_key = nl_attr_get(attrs[OVS_KEY_ATTR_TCP]);
              flow->tp_src = tcp_key->tcp_src;
              flow->tp_dst = tcp_key->tcp_dst;
              expected_bit = OVS_KEY_ATTR_TCP;
          }
      } else if (src_flow->nw_proto == IPPROTO_UDP
                 && (src_flow->dl_type == htons(ETH_TYPE_IP) ||
                     src_flow->dl_type == htons(ETH_TYPE_IPV6))
                 && !(src_flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_UDP;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_UDP)) {
              const struct ovs_key_udp *udp_key;
  
              udp_key = nl_attr_get(attrs[OVS_KEY_ATTR_UDP]);
              flow->tp_src = udp_key->udp_src;
              flow->tp_dst = udp_key->udp_dst;
              expected_bit = OVS_KEY_ATTR_UDP;
          }
      } else if (flow->nw_proto == IPPROTO_SCTP
                 && (flow->dl_type == htons(ETH_TYPE_IP) ||
                     flow->dl_type == htons(ETH_TYPE_IPV6))
                 && !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_SCTP;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_SCTP)) {
              const struct ovs_key_sctp *sctp_key;
  
              sctp_key = nl_attr_get(attrs[OVS_KEY_ATTR_SCTP]);
              flow->tp_src = sctp_key->sctp_src;
              flow->tp_dst = sctp_key->sctp_dst;
              expected_bit = OVS_KEY_ATTR_SCTP;
          }
      } else if (src_flow->nw_proto == IPPROTO_ICMP
                 && src_flow->dl_type == htons(ETH_TYPE_IP)
                 && !(src_flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ICMP;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ICMP)) {
              const struct ovs_key_icmp *icmp_key;
  
              icmp_key = nl_attr_get(attrs[OVS_KEY_ATTR_ICMP]);
              flow->tp_src = htons(icmp_key->icmp_type);
              flow->tp_dst = htons(icmp_key->icmp_code);
              expected_bit = OVS_KEY_ATTR_ICMP;
          }
      } else if (src_flow->nw_proto == IPPROTO_ICMPV6
                 && src_flow->dl_type == htons(ETH_TYPE_IPV6)
                 && !(src_flow->nw_frag & FLOW_NW_FRAG_LATER)) {
          if (!is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ICMPV6;
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ICMPV6)) {
              const struct ovs_key_icmpv6 *icmpv6_key;
  
              icmpv6_key = nl_attr_get(attrs[OVS_KEY_ATTR_ICMPV6]);
              flow->tp_src = htons(icmpv6_key->icmpv6_type);
              flow->tp_dst = htons(icmpv6_key->icmpv6_code);
              expected_bit = OVS_KEY_ATTR_ICMPV6;
              if (src_flow->tp_dst == htons(0) &&
                  (src_flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
                   src_flow->tp_src == htons(ND_NEIGHBOR_ADVERT))) {
                  if (!is_mask) {
                      expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ND;
                  }
                  if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ND)) {
                      const struct ovs_key_nd *nd_key;
  
                      nd_key = nl_attr_get(attrs[OVS_KEY_ATTR_ND]);
                      memcpy(&flow->nd_target, nd_key->nd_target,
                             sizeof flow->nd_target);
                      memcpy(flow->arp_sha, nd_key->nd_sll, ETH_ADDR_LEN);
                      memcpy(flow->arp_tha, nd_key->nd_tll, ETH_ADDR_LEN);
                      if (is_mask) {
                          if (!is_all_zeros((const uint8_t *) nd_key,
                                            sizeof *nd_key) &&
                              (flow->tp_src != htons(0xffff) ||
                               flow->tp_dst != htons(0xffff))) {
                              return ODP_FIT_ERROR;
                          } else {
                              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ND;
                          }
                      }
                  }
              }
          }
      }
      if (is_mask && expected_bit != OVS_KEY_ATTR_UNSPEC) {
          if ((flow->tp_src || flow->tp_dst) && flow->nw_proto != 0xff) {
              return ODP_FIT_ERROR;
          } else {
              expected_attrs |= UINT64_C(1) << expected_bit;
          }
      }
  
  done:
      return check_expectations(present_attrs, out_of_range_attr, expected_attrs,
                                key, key_len);
  }
  
  /* Parse 802.1Q header then encapsulated L3 attributes. */
  static enum odp_key_fitness
  parse_8021q_onward(const struct nlattr *attrs[OVS_KEY_ATTR_MAX + 1],
                     uint64_t present_attrs, int out_of_range_attr,
                     uint64_t expected_attrs, struct flow *flow,
                     const struct nlattr *key, size_t key_len,
                     const struct flow *src_flow)
  {
      static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
      bool is_mask = src_flow != flow;
  
      const struct nlattr *encap
          = (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ENCAP)
             ? attrs[OVS_KEY_ATTR_ENCAP] : NULL);
      enum odp_key_fitness encap_fitness;
      enum odp_key_fitness fitness;
      ovs_be16 tci;
  
      /* Calculate fitness of outer attributes. */
      if (!is_mask) {
          expected_attrs |= ((UINT64_C(1) << OVS_KEY_ATTR_VLAN) |
                            (UINT64_C(1) << OVS_KEY_ATTR_ENCAP));
      } else {
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_VLAN)) {
              expected_attrs |= (UINT64_C(1) << OVS_KEY_ATTR_VLAN);
          }
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ENCAP)) {
              expected_attrs |= (UINT64_C(1) << OVS_KEY_ATTR_ENCAP);
          }
      }
      fitness = check_expectations(present_attrs, out_of_range_attr,
                                   expected_attrs, key, key_len);
  
      /* Get the VLAN TCI value. */
      if (!is_mask && !(present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_VLAN))) {
          return ODP_FIT_TOO_LITTLE;
      } else {
          tci = nl_attr_get_be16(attrs[OVS_KEY_ATTR_VLAN]);
          if (!is_mask) {
  	    if (tci == htons(0)) {
                  /* Corner case for a truncated 802.1Q header. */
  	        if (fitness == ODP_FIT_PERFECT && nl_attr_get_size(encap)) {
  		    return ODP_FIT_TOO_MUCH;
  	        }
  	        return fitness;
  	    } else if (!(tci & htons(VLAN_CFI))) {
  	        VLOG_ERR_RL(&rl, "OVS_KEY_ATTR_VLAN 0x%04"PRIx16" is nonzero "
  	                    "but CFI bit is not set", ntohs(tci));
  	        return ODP_FIT_ERROR;
  	    }
          }
          /* Set vlan_tci.
           * Remove the TPID from dl_type since it's not the real Ethertype.  */
          flow->dl_type = htons(0);
          flow->vlan_tci = tci;
      }
  
      if (is_mask && !(present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ENCAP))) {
          return fitness;
      }
      /* Now parse the encapsulated attributes. */
      if (!parse_flow_nlattrs(nl_attr_get(encap), nl_attr_get_size(encap),
                              attrs, &present_attrs, &out_of_range_attr)) {
          return ODP_FIT_ERROR;
      }
      expected_attrs = 0;
  
      if (!parse_ethertype(attrs, present_attrs, &expected_attrs, flow, src_flow)) {
          return ODP_FIT_ERROR;
      }
      encap_fitness = parse_l2_5_onward(attrs, present_attrs, out_of_range_attr,
                                        expected_attrs, flow, key, key_len,
                                        src_flow);
  
      /* The overall fitness is the worse of the outer and inner attributes. */
      return MAX(fitness, encap_fitness);
  }
  
  static enum odp_key_fitness
  odp_flow_key_to_flow__(const struct nlattr *key, size_t key_len,
                         struct flow *flow, const struct flow *src_flow)
  {
      const struct nlattr *attrs[OVS_KEY_ATTR_MAX + 1];
      uint64_t expected_attrs;
      uint64_t present_attrs;
      int out_of_range_attr;
      bool is_mask = src_flow != flow;
  
      memset(flow, 0, sizeof *flow);
  
      /* Parse attributes. */
      if (!parse_flow_nlattrs(key, key_len, attrs, &present_attrs,
                              &out_of_range_attr)) {
          return ODP_FIT_ERROR;
      }
      expected_attrs = 0;
  
      /* Metadata. */
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_PRIORITY)) {
          flow->skb_priority = nl_attr_get_u32(attrs[OVS_KEY_ATTR_PRIORITY]);
          expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_PRIORITY;
      }
  
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_SKB_MARK)) {
          flow->pkt_mark = nl_attr_get_u32(attrs[OVS_KEY_ATTR_SKB_MARK]);
          expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_SKB_MARK;
      }
  
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_TUNNEL)) {
          enum odp_key_fitness res;
  
          res = odp_tun_key_from_attr(attrs[OVS_KEY_ATTR_TUNNEL], &flow->tunnel);
          if (res == ODP_FIT_ERROR) {
              return ODP_FIT_ERROR;
          } else if (res == ODP_FIT_PERFECT) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_TUNNEL;
          }
      }
  
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_IN_PORT)) {
          flow->in_port.odp_port
              = nl_attr_get_odp_port(attrs[OVS_KEY_ATTR_IN_PORT]);
          expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_IN_PORT;
      } else if (!is_mask) {
          flow->in_port.odp_port = ODPP_NONE;
      }
  
      /* Ethernet header. */
      if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_ETHERNET)) {
          const struct ovs_key_ethernet *eth_key;
  
          eth_key = nl_attr_get(attrs[OVS_KEY_ATTR_ETHERNET]);
          memcpy(flow->dl_src, eth_key->eth_src, ETH_ADDR_LEN);
          memcpy(flow->dl_dst, eth_key->eth_dst, ETH_ADDR_LEN);
          if (is_mask) {
              expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ETHERNET;
          }
      }
      if (!is_mask) {
          expected_attrs |= UINT64_C(1) << OVS_KEY_ATTR_ETHERNET;
      }
  
      /* Get Ethertype or 802.1Q TPID or FLOW_DL_TYPE_NONE. */
      if (!parse_ethertype(attrs, present_attrs, &expected_attrs, flow,
          src_flow)) {
          return ODP_FIT_ERROR;
      }
  
      if ((is_mask && (src_flow->vlan_tci & htons(VLAN_CFI))) ||
          (!is_mask && src_flow->dl_type == htons(ETH_TYPE_VLAN))) {
          return parse_8021q_onward(attrs, present_attrs, out_of_range_attr,
                                    expected_attrs, flow, key, key_len, src_flow);
      }
      if (is_mask) {
          flow->vlan_tci = htons(0xffff);
          if (present_attrs & (UINT64_C(1) << OVS_KEY_ATTR_VLAN)) {
              flow->vlan_tci = nl_attr_get_be16(attrs[OVS_KEY_ATTR_VLAN]);
              expected_attrs |= (UINT64_C(1) << OVS_KEY_ATTR_VLAN);
          }
      }
      return parse_l2_5_onward(attrs, present_attrs, out_of_range_attr,
                               expected_attrs, flow, key, key_len, src_flow);
  }
  
  /* Converts the 'key_len' bytes of OVS_KEY_ATTR_* attributes in 'key' to a flow
   * structure in 'flow'.  Returns an ODP_FIT_* value that indicates how well
   * 'key' fits our expectations for what a flow key should contain.
   *
   * The 'in_port' will be the datapath's understanding of the port.  The
   * caller will need to translate with odp_port_to_ofp_port() if the
   * OpenFlow port is needed.
   *
   * This function doesn't take the packet itself as an argument because none of
   * the currently understood OVS_KEY_ATTR_* attributes require it.  Currently,
   * it is always possible to infer which additional attribute(s) should appear
   * by looking at the attributes for lower-level protocols, e.g. if the network
   * protocol in OVS_KEY_ATTR_IPV4 or OVS_KEY_ATTR_IPV6 is IPPROTO_TCP then we
   * know that a OVS_KEY_ATTR_TCP attribute must appear and that otherwise it
   * must be absent. */
  enum odp_key_fitness
  odp_flow_key_to_flow(const struct nlattr *key, size_t key_len,
                       struct flow *flow)
  {
     return odp_flow_key_to_flow__(key, key_len, flow, flow);
  }
  
  /* Converts the 'key_len' bytes of OVS_KEY_ATTR_* attributes in 'key' to a mask
   * structure in 'mask'.  'flow' must be a previously translated flow
   * corresponding to 'mask'.  Returns an ODP_FIT_* value that indicates how well
   * 'key' fits our expectations for what a flow key should contain. */
  enum odp_key_fitness
  odp_flow_key_to_mask(const struct nlattr *key, size_t key_len,
                       struct flow *mask, const struct flow *flow)
  {
     return odp_flow_key_to_flow__(key, key_len, mask, flow);
  }
  
  /* Returns 'fitness' as a string, for use in debug messages. */
  const char *
  odp_key_fitness_to_string(enum odp_key_fitness fitness)
  {
      switch (fitness) {
      case ODP_FIT_PERFECT:
          return "OK";
      case ODP_FIT_TOO_MUCH:
          return "too_much";
      case ODP_FIT_TOO_LITTLE:
          return "too_little";
      case ODP_FIT_ERROR:
          return "error";
      default:
          return "<unknown>";
      }
  }
  
  /* Appends an OVS_ACTION_ATTR_USERSPACE action to 'odp_actions' that specifies
   * Netlink PID 'pid'.  If 'userdata' is nonnull, adds a userdata attribute
   * whose contents are the 'userdata_size' bytes at 'userdata' and returns the
   * offset within 'odp_actions' of the start of the cookie.  (If 'userdata' is
   * null, then the return value is not meaningful.) */
  size_t
  odp_put_userspace_action(uint32_t pid,
                           const void *userdata, size_t userdata_size,
                           struct ofpbuf *odp_actions)
  {
      size_t userdata_ofs;
      size_t offset;
  
      offset = nl_msg_start_nested(odp_actions, OVS_ACTION_ATTR_USERSPACE);
      nl_msg_put_u32(odp_actions, OVS_USERSPACE_ATTR_PID, pid);
      if (userdata) {
          userdata_ofs = odp_actions->size + NLA_HDRLEN;
          nl_msg_put_unspec(odp_actions, OVS_USERSPACE_ATTR_USERDATA,
                            userdata, userdata_size);
      } else {
          userdata_ofs = 0;
      }
      nl_msg_end_nested(odp_actions, offset);
  
      return userdata_ofs;
  }
  
  void
  odp_put_tunnel_action(const struct flow_tnl *tunnel,
                        struct ofpbuf *odp_actions)
  {
      size_t offset = nl_msg_start_nested(odp_actions, OVS_ACTION_ATTR_SET);
      tun_key_to_attr(odp_actions, tunnel);
      nl_msg_end_nested(odp_actions, offset);
  }
  
  /* The commit_odp_actions() function and its helpers. */
  
  static void
  commit_set_action(struct ofpbuf *odp_actions, enum ovs_key_attr key_type,
                    const void *key, size_t key_size)
  {
      size_t offset = nl_msg_start_nested(odp_actions, OVS_ACTION_ATTR_SET);
      nl_msg_put_unspec(odp_actions, key_type, key, key_size);
      nl_msg_end_nested(odp_actions, offset);
  }
  
  void
  odp_put_pkt_mark_action(const uint32_t pkt_mark,
                          struct ofpbuf *odp_actions)
  {
      commit_set_action(odp_actions, OVS_KEY_ATTR_SKB_MARK, &pkt_mark,
                        sizeof(pkt_mark));
  }
  
  /* If any of the flow key data that ODP actions can modify are different in
   * 'base->tunnel' and 'flow->tunnel', appends a set_tunnel ODP action to
   * 'odp_actions' that change the flow tunneling information in key from
   * 'base->tunnel' into 'flow->tunnel', and then changes 'base->tunnel' in the
   * same way.  In other words, operates the same as commit_odp_actions(), but
   * only on tunneling information. */
  void
  commit_odp_tunnel_action(const struct flow *flow, struct flow *base,
                           struct ofpbuf *odp_actions)
  {
      /* A valid IPV4_TUNNEL must have non-zero ip_dst. */
      if (flow->tunnel.ip_dst) {
          if (!memcmp(&base->tunnel, &flow->tunnel, sizeof base->tunnel)) {
              return;
          }
          memcpy(&base->tunnel, &flow->tunnel, sizeof base->tunnel);
          odp_put_tunnel_action(&base->tunnel, odp_actions);
      }
  }
  
  static void
  commit_set_ether_addr_action(const struct flow *flow, struct flow *base,
                               struct ofpbuf *odp_actions,
                               struct flow_wildcards *wc)
  {
      struct ovs_key_ethernet eth_key;
  
      if (eth_addr_equals(base->dl_src, flow->dl_src) &&
          eth_addr_equals(base->dl_dst, flow->dl_dst)) {
          return;
      }
  
      memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
      memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
  
      memcpy(base->dl_src, flow->dl_src, ETH_ADDR_LEN);
      memcpy(base->dl_dst, flow->dl_dst, ETH_ADDR_LEN);
  
      memcpy(eth_key.eth_src, base->dl_src, ETH_ADDR_LEN);
      memcpy(eth_key.eth_dst, base->dl_dst, ETH_ADDR_LEN);
  
      commit_set_action(odp_actions, OVS_KEY_ATTR_ETHERNET,
                        &eth_key, sizeof(eth_key));
  }
  
  static void
  commit_vlan_action(const struct flow *flow, struct flow *base,
                     struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      if (base->vlan_tci == flow->vlan_tci) {
          return;
      }
  
      memset(&wc->masks.vlan_tci, 0xff, sizeof wc->masks.vlan_tci);
  
      if (base->vlan_tci & htons(VLAN_CFI)) {
          nl_msg_put_flag(odp_actions, OVS_ACTION_ATTR_POP_VLAN);
      }
  
      if (flow->vlan_tci & htons(VLAN_CFI)) {
          struct ovs_action_push_vlan vlan;
  
          vlan.vlan_tpid = htons(ETH_TYPE_VLAN);
          vlan.vlan_tci = flow->vlan_tci;
          nl_msg_put_unspec(odp_actions, OVS_ACTION_ATTR_PUSH_VLAN,
                            &vlan, sizeof vlan);
      }
      base->vlan_tci = flow->vlan_tci;
  }
  
  static void
  commit_mpls_action(const struct flow *flow, struct flow *base,
                     struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      if (flow->mpls_lse == base->mpls_lse &&
          flow->mpls_depth == base->mpls_depth) {
          return;
      }
  
      memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
  
      if (flow->mpls_depth < base->mpls_depth) {
          if (base->mpls_depth - flow->mpls_depth > 1) {
              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
              VLOG_WARN_RL(&rl, "Multiple mpls_pop actions reduced to "
                           " a single mpls_pop action");
          }
  
          nl_msg_put_be16(odp_actions, OVS_ACTION_ATTR_POP_MPLS, flow->dl_type);
      } else if (flow->mpls_depth > base->mpls_depth) {
          struct ovs_action_push_mpls *mpls;
  
          if (flow->mpls_depth - base->mpls_depth > 1) {
              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
              VLOG_WARN_RL(&rl, "Multiple mpls_push actions reduced to "
                           " a single mpls_push action");
          }
  
          mpls = nl_msg_put_unspec_uninit(odp_actions, OVS_ACTION_ATTR_PUSH_MPLS,
                                          sizeof *mpls);
          memset(mpls, 0, sizeof *mpls);
          mpls->mpls_ethertype = flow->dl_type;
          mpls->mpls_lse = flow->mpls_lse;
      } else {
          struct ovs_key_mpls mpls_key;
  
          mpls_key.mpls_lse = flow->mpls_lse;
          commit_set_action(odp_actions, OVS_KEY_ATTR_MPLS,
                            &mpls_key, sizeof(mpls_key));
      }
  
      base->dl_type = flow->dl_type;
      base->mpls_lse = flow->mpls_lse;
      base->mpls_depth = flow->mpls_depth;
  }
  
  static void
  commit_set_ipv4_action(const struct flow *flow, struct flow *base,
                       struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      struct ovs_key_ipv4 ipv4_key;
  
      if (base->nw_src == flow->nw_src &&
          base->nw_dst == flow->nw_dst &&
          base->nw_tos == flow->nw_tos &&
          base->nw_ttl == flow->nw_ttl &&
          base->nw_frag == flow->nw_frag) {
          return;
      }
  
      memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
      memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
      memset(&wc->masks.nw_tos, 0xff, sizeof wc->masks.nw_tos);
      memset(&wc->masks.nw_ttl, 0xff, sizeof wc->masks.nw_ttl);
      memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
      memset(&wc->masks.nw_frag, 0xff, sizeof wc->masks.nw_frag);
  
      ipv4_key.ipv4_src = base->nw_src = flow->nw_src;
      ipv4_key.ipv4_dst = base->nw_dst = flow->nw_dst;
      ipv4_key.ipv4_tos = base->nw_tos = flow->nw_tos;
      ipv4_key.ipv4_ttl = base->nw_ttl = flow->nw_ttl;
      ipv4_key.ipv4_proto = base->nw_proto;
      ipv4_key.ipv4_frag = ovs_to_odp_frag(base->nw_frag);
  
      commit_set_action(odp_actions, OVS_KEY_ATTR_IPV4,
                        &ipv4_key, sizeof(ipv4_key));
  }
  
  static void
  commit_set_ipv6_action(const struct flow *flow, struct flow *base,
                         struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      struct ovs_key_ipv6 ipv6_key;
      //BN
      //char str[INET_ADDRSTRLEN];
  
      if (ipv6_addr_equals(&base->ipv6_src, &flow->ipv6_src) &&
          ipv6_addr_equals(&base->ipv6_dst, &flow->ipv6_dst) &&
          base->ipv6_label == flow->ipv6_label &&
          base->nw_tos == flow->nw_tos &&
          base->nw_ttl == flow->nw_ttl &&
          base->nw_frag == flow->nw_frag) {
          return;
      }
  
      memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
      memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
      memset(&wc->masks.ipv6_label, 0xff, sizeof wc->masks.ipv6_label);
      memset(&wc->masks.nw_tos, 0xff, sizeof wc->masks.nw_tos);
      memset(&wc->masks.nw_ttl, 0xff, sizeof wc->masks.nw_ttl);
      memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
      memset(&wc->masks.nw_frag, 0xff, sizeof wc->masks.nw_frag);
  
      base->ipv6_src = flow->ipv6_src;
      memcpy(&ipv6_key.ipv6_src, &base->ipv6_src, sizeof(ipv6_key.ipv6_src));
      base->ipv6_dst = flow->ipv6_dst;
      memcpy(&ipv6_key.ipv6_dst, &base->ipv6_dst, sizeof(ipv6_key.ipv6_dst));
  
      ipv6_key.ipv6_label = base->ipv6_label = flow->ipv6_label;
      ipv6_key.ipv6_tclass = base->nw_tos = flow->nw_tos;
      ipv6_key.ipv6_hlimit = base->nw_ttl = flow->nw_ttl;
      ipv6_key.ipv6_proto = base->nw_proto;
      ipv6_key.ipv6_frag = ovs_to_odp_frag(base->nw_frag);
  
      commit_set_action(odp_actions, OVS_KEY_ATTR_IPV6,
                        &ipv6_key, sizeof(ipv6_key));
      //BN
      //inet_ntop(AF_INET6, &ipv6_key.ipv6_dst, str, INET6_ADDRSTRLEN);
      //VLOG_WARN("commit_set_ipv6_action\n");
  }
  
  static void
  commit_set_nw_action(const struct flow *flow, struct flow *base,
                       struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      /* Check if flow really have an IP header. */
      if (!flow->nw_proto) {
          return;
      }
  
      if (base->dl_type == htons(ETH_TYPE_IP)) {
          commit_set_ipv4_action(flow, base, odp_actions, wc);
      } else if (base->dl_type == htons(ETH_TYPE_IPV6)) {
          commit_set_ipv6_action(flow, base, odp_actions, wc);
      }
  }
  
  static void
  commit_set_port_action(const struct flow *flow, struct flow *base,
                         struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      if (!is_ip_any(base) || (!base->tp_src && !base->tp_dst)) {
          return;
      }
  
      if (base->tp_src == flow->tp_src &&
          base->tp_dst == flow->tp_dst) {
          return;
      }
  
      memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
      memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
  
      if (flow->nw_proto == IPPROTO_TCP) {
          struct ovs_key_tcp port_key;
  
          port_key.tcp_src = base->tp_src = flow->tp_src;
          port_key.tcp_dst = base->tp_dst = flow->tp_dst;
  
          commit_set_action(odp_actions, OVS_KEY_ATTR_TCP,
                            &port_key, sizeof(port_key));
  
      } else if (flow->nw_proto == IPPROTO_UDP) {
          struct ovs_key_udp port_key;
  
          port_key.udp_src = base->tp_src = flow->tp_src;
          port_key.udp_dst = base->tp_dst = flow->tp_dst;
  
          commit_set_action(odp_actions, OVS_KEY_ATTR_UDP,
                            &port_key, sizeof(port_key));
      } else if (flow->nw_proto == IPPROTO_SCTP) {
          struct ovs_key_sctp port_key;
  
          port_key.sctp_src = base->tp_src = flow->tp_src;
          port_key.sctp_dst = base->tp_dst = flow->tp_dst;
  
          commit_set_action(odp_actions, OVS_KEY_ATTR_SCTP,
                            &port_key, sizeof(port_key));
      }
  }
  
  static void
  commit_set_priority_action(const struct flow *flow, struct flow *base,
                             struct ofpbuf *odp_actions,
                             struct flow_wildcards *wc)
  {
      if (base->skb_priority == flow->skb_priority) {
          return;
      }
  
      memset(&wc->masks.skb_priority, 0xff, sizeof wc->masks.skb_priority);
      base->skb_priority = flow->skb_priority;
  
      commit_set_action(odp_actions, OVS_KEY_ATTR_PRIORITY,
                        &base->skb_priority, sizeof(base->skb_priority));
  }
  
  static void
  commit_set_pkt_mark_action(const struct flow *flow, struct flow *base,
                             struct ofpbuf *odp_actions,
                             struct flow_wildcards *wc)
  {
      if (base->pkt_mark == flow->pkt_mark) {
          return;
      }
  
      memset(&wc->masks.pkt_mark, 0xff, sizeof wc->masks.pkt_mark);
      base->pkt_mark = flow->pkt_mark;
  
      odp_put_pkt_mark_action(base->pkt_mark, odp_actions);
  }
  
  #ifdef SR
  //BN
  void
  commit_odp_set_nw_actions(const struct flow *flow, struct flow *base,
                     struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      commit_set_nw_action(flow, base, odp_actions, wc);
  }
  
  void
  set_ipv6_segment(struct flow *flow, struct in6_addr *last_dst_ipv6)
  {
  	//unsigned char empty[16];
  	//int i = 0;
  	//for (i = 0; i < 16; i++){
  	//	empty[i] = 0;
  	//}
  	if (flow->current_segment < MAX_IPV6_SEGMENTS){
  		//VLOG_WARN("flow->current_segment = %d\n", flow->current_segment);
  		//for (i = 0; i < 4; i++){
  		//	VLOG_WARN("flow->ipv6_dst = %02X\n", flow->ipv6_dst.s6_addr32[i]);
  		//}
  		//if (last_dst_ipv6)
  			//for (i = 0; i < 4; i++){
  			//	VLOG_WARN("last_ipv6_dst = %02X\n", last_dst_ipv6->s6_addr32[i]);
  			//}
  
  		if (last_dst_ipv6 && memcmp(last_dst_ipv6, &flow->ipv6_dst, sizeof(struct in6_addr)) == 0) {
  			VLOG_WARN("Already encounter this set ipv6_dst\n");
  			return;
  		} else {
  			VLOG_INFO("set_ipv6_segment: set ipv6 in flow, index = %d\n", flow->current_segment);
  			flow->ipv6_segments[flow->current_segment++] = flow->ipv6_dst;
  		}
  	} else {
  		VLOG_ERR("More segments received than the maximum allowed IPv6 segments %d\n", MAX_IPV6_SEGMENTS);
  	}
  }
  
  static void
  commit_set_ipv6_segment(const struct flow *flow, struct flow *base,
                         struct ofpbuf *odp_actions, const uint32_t index, struct flow_wildcards *wc)
  {
      struct ovs_key_ipv6 ipv6_key;
  
      memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
      memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
      memset(&wc->masks.ipv6_label, 0xff, sizeof wc->masks.ipv6_label);
      memset(&wc->masks.nw_tos, 0xff, sizeof wc->masks.nw_tos);
      memset(&wc->masks.nw_ttl, 0xff, sizeof wc->masks.nw_ttl);
      memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
      memset(&wc->masks.nw_frag, 0xff, sizeof wc->masks.nw_frag);
  
  
      base->ipv6_src = flow->ipv6_src;
      memcpy(&ipv6_key.ipv6_src, &base->ipv6_src, sizeof(ipv6_key.ipv6_src));
      base->ipv6_dst = flow->ipv6_dst;
      //ipv6_key.ipv6_dst store the ipv6 segment.
      memcpy(&ipv6_key.ipv6_dst, &flow->ipv6_segments[index], sizeof(ipv6_key.ipv6_dst));
  
      ipv6_key.ipv6_label = base->ipv6_label = flow->ipv6_label;
      ipv6_key.ipv6_tclass = base->nw_tos = flow->nw_tos;
      ipv6_key.ipv6_hlimit = base->nw_ttl = flow->nw_ttl;
      ipv6_key.ipv6_proto = base->nw_proto;
      ipv6_key.ipv6_frag = ovs_to_odp_frag(base->nw_frag);
  
      commit_set_action(odp_actions, OVS_KEY_ATTR_IPV6,
                        &ipv6_key, sizeof(ipv6_key));
      VLOG_WARN("commit_set_ipv6_segment, index = %d\n", index);
  }
  
  
  static void
  commit_set_ipv6_segments_action(const struct flow *flow, struct flow *base,
                       struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      uint32_t i = 0;
      /* Check if flow really have an IP header. */
      if (!flow->nw_proto) {
          return;
      }
  
      if (base->dl_type == htons(ETH_TYPE_IPV6)) {
  	for (i = 0 ; i < flow->current_segment; i++){ 
          	commit_set_ipv6_segment(flow, base, odp_actions, i, wc);
  	}
      } else {
  	VLOG_ERR("ERR: Packets are not IPv6!\n");
      }
  }
  
  #endif
  
  /* If any of the flow key data that ODP actions can modify are different in
   * 'base' and 'flow', appends ODP actions to 'odp_actions' that change the flow
   * key from 'base' into 'flow', and then changes 'base' the same way.  Does not
   * commit set_tunnel actions.  Users should call commit_odp_tunnel_action()
   * in addition to this function if needed.  Sets fields in 'wc' that are
   * used as part of the action. */
  void
  commit_odp_actions(const struct flow *flow, struct flow *base,
                     struct ofpbuf *odp_actions, struct flow_wildcards *wc)
  {
      commit_set_ether_addr_action(flow, base, odp_actions, wc);
      commit_vlan_action(flow, base, odp_actions, wc);
      //commit_set_nw_action(flow, base, odp_actions, wc);
      commit_set_ipv6_segments_action(flow, base, odp_actions, wc);
      commit_set_port_action(flow, base, odp_actions, wc);
      /* Committing MPLS actions should occur after committing nw and port
       * actions. This is because committing MPLS actions may alter a packet so
       * that it is no longer IP and thus nw and port actions are no longer valid.
       */
      commit_mpls_action(flow, base, odp_actions, wc);
      commit_set_priority_action(flow, base, odp_actions, wc);
      commit_set_pkt_mark_action(flow, base, odp_actions, wc);
  }
  