app/test-pmd/icmpecho.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2013 6WIND S.A.
   3  */
   4
   5 #include <stdarg.h>
   6 #include <string.h>
   7 #include <stdio.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12
  13 #include <sys/queue.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_common.h>
  17 #include <rte_byteorder.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_per_lcore.h>
  22 #include <rte_lcore.h>
  23 #include <rte_atomic.h>
  24 #include <rte_branch_prediction.h>
  25 #include <rte_memory.h>
  26 #include <rte_mempool.h>
  27 #include <rte_mbuf.h>
  28 #include <rte_ether.h>
  29 #include <rte_ethdev.h>
  30 #include <rte_arp.h>
  31 #include <rte_ip.h>
  32 #include <rte_icmp.h>
  33 #include <rte_string_fns.h>
  34 #include <rte_flow.h>
  35
  36 #include "testpmd.h"
  37
  38 static const char *
  39 arp_op_name(uint16_t arp_op)
  40 {
  41         switch (arp_op) {
  42         case RTE_ARP_OP_REQUEST:
  43                 return "ARP Request";
  44         case RTE_ARP_OP_REPLY:
  45                 return "ARP Reply";
  46         case RTE_ARP_OP_REVREQUEST:
  47                 return "Reverse ARP Request";
  48         case RTE_ARP_OP_REVREPLY:
  49                 return "Reverse ARP Reply";
  50         case RTE_ARP_OP_INVREQUEST:
  51                 return "Peer Identify Request";
  52         case RTE_ARP_OP_INVREPLY:
  53                 return "Peer Identify Reply";
  54         default:
  55                 break;
  56         }
  57         return "Unkwown ARP op";
  58 }
  59
  60 static const char *
  61 ip_proto_name(uint16_t ip_proto)
  62 {
  63         static const char * ip_proto_names[] = {
  64                 "IP6HOPOPTS", /**< IP6 hop-by-hop options */
  65                 "ICMP",       /**< control message protocol */
  66                 "IGMP",       /**< group mgmt protocol */
  67                 "GGP",        /**< gateway^2 (deprecated) */
  68                 "IPv4",       /**< IPv4 encapsulation */
  69
  70                 "UNASSIGNED",
  71                 "TCP",        /**< transport control protocol */
  72                 "ST",         /**< Stream protocol II */
  73                 "EGP",        /**< exterior gateway protocol */
  74                 "PIGP",       /**< private interior gateway */
  75
  76                 "RCC_MON",    /**< BBN RCC Monitoring */
  77                 "NVPII",      /**< network voice protocol*/
  78                 "PUP",        /**< pup */
  79                 "ARGUS",      /**< Argus */
  80                 "EMCON",      /**< EMCON */
  81
  82                 "XNET",       /**< Cross Net Debugger */
  83                 "CHAOS",      /**< Chaos*/
  84                 "UDP",        /**< user datagram protocol */
  85                 "MUX",        /**< Multiplexing */
  86                 "DCN_MEAS",   /**< DCN Measurement Subsystems */
  87
  88                 "HMP",        /**< Host Monitoring */
  89                 "PRM",        /**< Packet Radio Measurement */
  90                 "XNS_IDP",    /**< xns idp */
  91                 "TRUNK1",     /**< Trunk-1 */
  92                 "TRUNK2",     /**< Trunk-2 */
  93
  94                 "LEAF1",      /**< Leaf-1 */
  95                 "LEAF2",      /**< Leaf-2 */
  96                 "RDP",        /**< Reliable Data */
  97                 "IRTP",       /**< Reliable Transaction */
  98                 "TP4",        /**< tp-4 w/ class negotiation */
  99
 100                 "BLT",        /**< Bulk Data Transfer */
 101                 "NSP",        /**< Network Services */
 102                 "INP",        /**< Merit Internodal */
 103                 "SEP",        /**< Sequential Exchange */
 104                 "3PC",        /**< Third Party Connect */
 105
 106                 "IDPR",       /**< InterDomain Policy Routing */
 107                 "XTP",        /**< XTP */
 108                 "DDP",        /**< Datagram Delivery */
 109                 "CMTP",       /**< Control Message Transport */
 110                 "TPXX",       /**< TP++ Transport */
 111
 112                 "ILTP",       /**< IL transport protocol */
 113                 "IPv6_HDR",   /**< IP6 header */
 114                 "SDRP",       /**< Source Demand Routing */
 115                 "IPv6_RTG",   /**< IP6 routing header */
 116                 "IPv6_FRAG",  /**< IP6 fragmentation header */
 117
 118                 "IDRP",       /**< InterDomain Routing*/
 119                 "RSVP",       /**< resource reservation */
 120                 "GRE",        /**< General Routing Encap. */
 121                 "MHRP",       /**< Mobile Host Routing */
 122                 "BHA",        /**< BHA */
 123
 124                 "ESP",        /**< IP6 Encap Sec. Payload */
 125                 "AH",         /**< IP6 Auth Header */
 126                 "INLSP",      /**< Integ. Net Layer Security */
 127                 "SWIPE",      /**< IP with encryption */
 128                 "NHRP",       /**< Next Hop Resolution */
 129
 130                 "UNASSIGNED",
 131                 "UNASSIGNED",
 132                 "UNASSIGNED",
 133                 "ICMPv6",     /**< ICMP6 */
 134                 "IPv6NONEXT", /**< IP6 no next header */
 135
 136                 "Ipv6DSTOPTS",/**< IP6 destination option */
 137                 "AHIP",       /**< any host internal protocol */
 138                 "CFTP",       /**< CFTP */
 139                 "HELLO",      /**< "hello" routing protocol */
 140                 "SATEXPAK",   /**< SATNET/Backroom EXPAK */
 141
 142                 "KRYPTOLAN",  /**< Kryptolan */
 143                 "RVD",        /**< Remote Virtual Disk */
 144                 "IPPC",       /**< Pluribus Packet Core */
 145                 "ADFS",       /**< Any distributed FS */
 146                 "SATMON",     /**< Satnet Monitoring */
 147
 148                 "VISA",       /**< VISA Protocol */
 149                 "IPCV",       /**< Packet Core Utility */
 150                 "CPNX",       /**< Comp. Prot. Net. Executive */
 151                 "CPHB",       /**< Comp. Prot. HeartBeat */
 152                 "WSN",        /**< Wang Span Network */
 153
 154                 "PVP",        /**< Packet Video Protocol */
 155                 "BRSATMON",   /**< BackRoom SATNET Monitoring */
 156                 "ND",         /**< Sun net disk proto (temp.) */
 157                 "WBMON",      /**< WIDEBAND Monitoring */
 158                 "WBEXPAK",    /**< WIDEBAND EXPAK */
 159
 160                 "EON",        /**< ISO cnlp */
 161                 "VMTP",       /**< VMTP */
 162                 "SVMTP",      /**< Secure VMTP */
 163                 "VINES",      /**< Banyon VINES */
 164                 "TTP",        /**< TTP */
 165
 166                 "IGP",        /**< NSFNET-IGP */
 167                 "DGP",        /**< dissimilar gateway prot. */
 168                 "TCF",        /**< TCF */
 169                 "IGRP",       /**< Cisco/GXS IGRP */
 170                 "OSPFIGP",    /**< OSPFIGP */
 171
 172                 "SRPC",       /**< Strite RPC protocol */
 173                 "LARP",       /**< Locus Address Resolution */
 174                 "MTP",        /**< Multicast Transport */
 175                 "AX25",       /**< AX.25 Frames */
 176                 "4IN4",       /**< IP encapsulated in IP */
 177
 178                 "MICP",       /**< Mobile Int.ing control */
 179                 "SCCSP",      /**< Semaphore Comm. security */
 180                 "ETHERIP",    /**< Ethernet IP encapsulation */
 181                 "ENCAP",      /**< encapsulation header */
 182                 "AES",        /**< any private encr. scheme */
 183
 184                 "GMTP",       /**< GMTP */
 185                 "IPCOMP",     /**< payload compression (IPComp) */
 186                 "UNASSIGNED",
 187                 "UNASSIGNED",
 188                 "PIM",        /**< Protocol Independent Mcast */
 189         };
 190
 191         if (ip_proto < sizeof(ip_proto_names) / sizeof(ip_proto_names[0]))
 192                 return ip_proto_names[ip_proto];
 193         switch (ip_proto) {
 194 #ifdef IPPROTO_PGM
 195         case IPPROTO_PGM:  /**< PGM */
 196                 return "PGM";
 197 #endif
 198         case IPPROTO_SCTP:  /**< Stream Control Transport Protocol */
 199                 return "SCTP";
 200 #ifdef IPPROTO_DIVERT
 201         case IPPROTO_DIVERT: /**< divert pseudo-protocol */
 202                 return "DIVERT";
 203 #endif
 204         case IPPROTO_RAW: /**< raw IP packet */
 205                 return "RAW";
 206         default:
 207                 break;
 208         }
 209         return "UNASSIGNED";
 210 }
 211
 212 static void
 213 ipv4_addr_to_dot(uint32_t be_ipv4_addr, char *buf)
 214 {
 215         uint32_t ipv4_addr;
 216
 217         ipv4_addr = rte_be_to_cpu_32(be_ipv4_addr);
 218         sprintf(buf, "%d.%d.%d.%d", (ipv4_addr >> 24) & 0xFF,
 219                 (ipv4_addr >> 16) & 0xFF, (ipv4_addr >> 8) & 0xFF,
 220                 ipv4_addr & 0xFF);
 221 }
 222
 223 static void
 224 ether_addr_dump(const char *what, const struct rte_ether_addr *ea)
 225 {
 226         char buf[RTE_ETHER_ADDR_FMT_SIZE];
 227
 228         rte_ether_format_addr(buf, RTE_ETHER_ADDR_FMT_SIZE, ea);
 229         if (what)
 230                 printf("%s", what);
 231         printf("%s", buf);
 232 }
 233
 234 static void
 235 ipv4_addr_dump(const char *what, uint32_t be_ipv4_addr)
 236 {
 237         char buf[16];
 238
 239         ipv4_addr_to_dot(be_ipv4_addr, buf);
 240         if (what)
 241                 printf("%s", what);
 242         printf("%s", buf);
 243 }
 244
 245 static uint16_t
 246 ipv4_hdr_cksum(struct rte_ipv4_hdr *ip_h)
 247 {
 248         uint16_t *v16_h;
 249         uint32_t ip_cksum;
 250
 251         /*
 252          * Compute the sum of successive 16-bit words of the IPv4 header,
 253          * skipping the checksum field of the header.
 254          */
 255         v16_h = (unaligned_uint16_t *) ip_h;
 256         ip_cksum = v16_h[0] + v16_h[1] + v16_h[2] + v16_h[3] +
 257                 v16_h[4] + v16_h[6] + v16_h[7] + v16_h[8] + v16_h[9];
 258
 259         /* reduce 32 bit checksum to 16 bits and complement it */
 260         ip_cksum = (ip_cksum & 0xffff) + (ip_cksum >> 16);
 261         ip_cksum = (ip_cksum & 0xffff) + (ip_cksum >> 16);
 262         ip_cksum = (~ip_cksum) & 0x0000FFFF;
 263         return (ip_cksum == 0) ? 0xFFFF : (uint16_t) ip_cksum;
 264 }
 265
 266 #define is_multicast_ipv4_addr(ipv4_addr) \
 267         (((rte_be_to_cpu_32((ipv4_addr)) >> 24) & 0x000000FF) == 0xE0)
 268
 269 /*
 270  * Receive a burst of packets, lookup for ICMP echo requests, and, if any,
 271  * send back ICMP echo replies.
 272  */
 273 static void
 274 reply_to_icmp_echo_rqsts(struct fwd_stream *fs)
 275 {
 276         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 277         struct rte_mbuf *pkt;
 278         struct rte_ether_hdr *eth_h;
 279         struct rte_vlan_hdr *vlan_h;
 280         struct rte_arp_hdr  *arp_h;
 281         struct rte_ipv4_hdr *ip_h;
 282         struct rte_icmp_hdr *icmp_h;
 283         struct rte_ether_addr eth_addr;
 284         uint32_t retry;
 285         uint32_t ip_addr;
 286         uint16_t nb_rx;
 287         uint16_t nb_tx;
 288         uint16_t nb_replies;
 289         uint16_t eth_type;
 290         uint16_t vlan_id;
 291         uint16_t arp_op;
 292         uint16_t arp_pro;
 293         uint32_t cksum;
 294         uint8_t  i;
 295         int l2_len;
 296 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 297         uint64_t start_tsc;
 298         uint64_t end_tsc;
 299         uint64_t core_cycles;
 300 #endif
 301
 302 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 303         start_tsc = rte_rdtsc();
 304 #endif
 305
 306         /*
 307          * First, receive a burst of packets.
 308          */
 309         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 310                                  nb_pkt_per_burst);
 311         if (unlikely(nb_rx == 0))
 312                 return;
 313
 314 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 315         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 316 #endif
 317         fs->rx_packets += nb_rx;
 318         nb_replies = 0;
 319         for (i = 0; i < nb_rx; i++) {
 320                 if (likely(i < nb_rx - 1))
 321                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 322                                                        void *));
 323                 pkt = pkts_burst[i];
 324                 eth_h = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
 325                 eth_type = RTE_BE_TO_CPU_16(eth_h->ether_type);
 326                 l2_len = sizeof(struct rte_ether_hdr);
 327                 if (verbose_level > 0) {
 328                         printf("\nPort %d pkt-len=%u nb-segs=%u\n",
 329                                fs->rx_port, pkt->pkt_len, pkt->nb_segs);
 330                         ether_addr_dump("  ETH:  src=", &eth_h->s_addr);
 331                         ether_addr_dump(" dst=", &eth_h->d_addr);
 332                 }
 333                 if (eth_type == RTE_ETHER_TYPE_VLAN) {
 334                         vlan_h = (struct rte_vlan_hdr *)
 335                                 ((char *)eth_h + sizeof(struct rte_ether_hdr));
 336                         l2_len  += sizeof(struct rte_vlan_hdr);
 337                         eth_type = rte_be_to_cpu_16(vlan_h->eth_proto);
 338                         if (verbose_level > 0) {
 339                                 vlan_id = rte_be_to_cpu_16(vlan_h->vlan_tci)
 340                                         & 0xFFF;
 341                                 printf(" [vlan id=%u]", vlan_id);
 342                         }
 343                 }
 344                 if (verbose_level > 0) {
 345                         printf(" type=0x%04x\n", eth_type);
 346                 }
 347
 348                 /* Reply to ARP requests */
 349                 if (eth_type == RTE_ETHER_TYPE_ARP) {
 350                         arp_h = (struct rte_arp_hdr *) ((char *)eth_h + l2_len);
 351                         arp_op = RTE_BE_TO_CPU_16(arp_h->arp_opcode);
 352                         arp_pro = RTE_BE_TO_CPU_16(arp_h->arp_protocol);
 353                         if (verbose_level > 0) {
 354                                 printf("  ARP:  hrd=%d proto=0x%04x hln=%d "
 355                                        "pln=%d op=%u (%s)\n",
 356                                        RTE_BE_TO_CPU_16(arp_h->arp_hardware),
 357                                        arp_pro, arp_h->arp_hlen,
 358                                        arp_h->arp_plen, arp_op,
 359                                        arp_op_name(arp_op));
 360                         }
 361                         if ((RTE_BE_TO_CPU_16(arp_h->arp_hardware) !=
 362                              RTE_ARP_HRD_ETHER) ||
 363                             (arp_pro != RTE_ETHER_TYPE_IPV4) ||
 364                             (arp_h->arp_hlen != 6) ||
 365                             (arp_h->arp_plen != 4)
 366                             ) {
 367                                 rte_pktmbuf_free(pkt);
 368                                 if (verbose_level > 0)
 369                                         printf("\n");
 370                                 continue;
 371                         }
 372                         if (verbose_level > 0) {
 373                                 rte_ether_addr_copy(&arp_h->arp_data.arp_sha,
 374                                                 &eth_addr);
 375                                 ether_addr_dump("        sha=", &eth_addr);
 376                                 ip_addr = arp_h->arp_data.arp_sip;
 377                                 ipv4_addr_dump(" sip=", ip_addr);
 378                                 printf("\n");
 379                                 rte_ether_addr_copy(&arp_h->arp_data.arp_tha,
 380                                                 &eth_addr);
 381                                 ether_addr_dump("        tha=", &eth_addr);
 382                                 ip_addr = arp_h->arp_data.arp_tip;
 383                                 ipv4_addr_dump(" tip=", ip_addr);
 384                                 printf("\n");
 385                         }
 386                         if (arp_op != RTE_ARP_OP_REQUEST) {
 387                                 rte_pktmbuf_free(pkt);
 388                                 continue;
 389                         }
 390
 391                         /*
 392                          * Build ARP reply.
 393                          */
 394
 395                         /* Use source MAC address as destination MAC address. */
 396                         rte_ether_addr_copy(&eth_h->s_addr, &eth_h->d_addr);
 397                         /* Set source MAC address with MAC address of TX port */
 398                         rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
 399                                         &eth_h->s_addr);
 400
 401                         arp_h->arp_opcode = rte_cpu_to_be_16(RTE_ARP_OP_REPLY);
 402                         rte_ether_addr_copy(&arp_h->arp_data.arp_tha,
 403                                         &eth_addr);
 404                         rte_ether_addr_copy(&arp_h->arp_data.arp_sha,
 405                                         &arp_h->arp_data.arp_tha);
 406                         rte_ether_addr_copy(&eth_h->s_addr,
 407                                         &arp_h->arp_data.arp_sha);
 408
 409                         /* Swap IP addresses in ARP payload */
 410                         ip_addr = arp_h->arp_data.arp_sip;
 411                         arp_h->arp_data.arp_sip = arp_h->arp_data.arp_tip;
 412                         arp_h->arp_data.arp_tip = ip_addr;
 413                         pkts_burst[nb_replies++] = pkt;
 414                         continue;
 415                 }
 416
 417                 if (eth_type != RTE_ETHER_TYPE_IPV4) {
 418                         rte_pktmbuf_free(pkt);
 419                         continue;
 420                 }
 421                 ip_h = (struct rte_ipv4_hdr *) ((char *)eth_h + l2_len);
 422                 if (verbose_level > 0) {
 423                         ipv4_addr_dump("  IPV4: src=", ip_h->src_addr);
 424                         ipv4_addr_dump(" dst=", ip_h->dst_addr);
 425                         printf(" proto=%d (%s)\n",
 426                                ip_h->next_proto_id,
 427                                ip_proto_name(ip_h->next_proto_id));
 428                 }
 429
 430                 /*
 431                  * Check if packet is a ICMP echo request.
 432                  */
 433                 icmp_h = (struct rte_icmp_hdr *) ((char *)ip_h +
 434                                               sizeof(struct rte_ipv4_hdr));
 435                 if (! ((ip_h->next_proto_id == IPPROTO_ICMP) &&
 436                        (icmp_h->icmp_type == RTE_IP_ICMP_ECHO_REQUEST) &&
 437                        (icmp_h->icmp_code == 0))) {
 438                         rte_pktmbuf_free(pkt);
 439                         continue;
 440                 }
 441
 442                 if (verbose_level > 0)
 443                         printf("  ICMP: echo request seq id=%d\n",
 444                                rte_be_to_cpu_16(icmp_h->icmp_seq_nb));
 445
 446                 /*
 447                  * Prepare ICMP echo reply to be sent back.
 448                  * - switch ethernet source and destinations addresses,
 449                  * - use the request IP source address as the reply IP
 450                  *    destination address,
 451                  * - if the request IP destination address is a multicast
 452                  *   address:
 453                  *     - choose a reply IP source address different from the
 454                  *       request IP source address,
 455                  *     - re-compute the IP header checksum.
 456                  *   Otherwise:
 457                  *     - switch the request IP source and destination
 458                  *       addresses in the reply IP header,
 459                  *     - keep the IP header checksum unchanged.
 460                  * - set RTE_IP_ICMP_ECHO_REPLY in ICMP header.
 461                  * ICMP checksum is computed by assuming it is valid in the
 462                  * echo request and not verified.
 463                  */
 464                 rte_ether_addr_copy(&eth_h->s_addr, &eth_addr);
 465                 rte_ether_addr_copy(&eth_h->d_addr, &eth_h->s_addr);
 466                 rte_ether_addr_copy(&eth_addr, &eth_h->d_addr);
 467                 ip_addr = ip_h->src_addr;
 468                 if (is_multicast_ipv4_addr(ip_h->dst_addr)) {
 469                         uint32_t ip_src;
 470
 471                         ip_src = rte_be_to_cpu_32(ip_addr);
 472                         if ((ip_src & 0x00000003) == 1)
 473                                 ip_src = (ip_src & 0xFFFFFFFC) | 0x00000002;
 474                         else
 475                                 ip_src = (ip_src & 0xFFFFFFFC) | 0x00000001;
 476                         ip_h->src_addr = rte_cpu_to_be_32(ip_src);
 477                         ip_h->dst_addr = ip_addr;
 478                         ip_h->hdr_checksum = ipv4_hdr_cksum(ip_h);
 479                 } else {
 480                         ip_h->src_addr = ip_h->dst_addr;
 481                         ip_h->dst_addr = ip_addr;
 482                 }
 483                 icmp_h->icmp_type = RTE_IP_ICMP_ECHO_REPLY;
 484                 cksum = ~icmp_h->icmp_cksum & 0xffff;
 485                 cksum += ~htons(RTE_IP_ICMP_ECHO_REQUEST << 8) & 0xffff;
 486                 cksum += htons(RTE_IP_ICMP_ECHO_REPLY << 8);
 487                 cksum = (cksum & 0xffff) + (cksum >> 16);
 488                 cksum = (cksum & 0xffff) + (cksum >> 16);
 489                 icmp_h->icmp_cksum = ~cksum;
 490                 pkts_burst[nb_replies++] = pkt;
 491         }
 492
 493         /* Send back ICMP echo replies, if any. */
 494         if (nb_replies > 0) {
 495                 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst,
 496                                          nb_replies);
 497                 /*
 498                  * Retry if necessary
 499                  */
 500                 if (unlikely(nb_tx < nb_replies) && fs->retry_enabled) {
 501                         retry = 0;
 502                         while (nb_tx < nb_replies &&
 503                                         retry++ < burst_tx_retry_num) {
 504                                 rte_delay_us(burst_tx_delay_time);
 505                                 nb_tx += rte_eth_tx_burst(fs->tx_port,
 506                                                 fs->tx_queue,
 507                                                 &pkts_burst[nb_tx],
 508                                                 nb_replies - nb_tx);
 509                         }
 510                 }
 511                 fs->tx_packets += nb_tx;
 512 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 513                 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
 514 #endif
 515                 if (unlikely(nb_tx < nb_replies)) {
 516                         fs->fwd_dropped += (nb_replies - nb_tx);
 517                         do {
 518                                 rte_pktmbuf_free(pkts_burst[nb_tx]);
 519                         } while (++nb_tx < nb_replies);
 520                 }
 521         }
 522
 523 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 524         end_tsc = rte_rdtsc();
 525         core_cycles = (end_tsc - start_tsc);
 526         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
 527 #endif
 528 }
 529
 530 struct fwd_engine icmp_echo_engine = {
 531         .fwd_mode_name  = "icmpecho",
 532         .port_fwd_begin = NULL,
 533         .port_fwd_end   = NULL,
 534         .packet_fwd     = reply_to_icmp_echo_rqsts,
 535 };