VNFs/DPPD-PROX/packet_utils.c

   1 /*
   2 // Copyright (c) 2010-2020 Intel Corporation
   3 //
   4 // Licensed under the Apache License, Version 2.0 (the "License");
   5 // you may not use this file except in compliance with the License.
   6 // You may obtain a copy of the License at
   7 //
   8 //     http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // Unless required by applicable law or agreed to in writing, software
  11 // distributed under the License is distributed on an "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 // See the License for the specific language governing permissions and
  14 // limitations under the License.
  15 */
  16
  17 #include <rte_lcore.h>
  18 #include <rte_hash.h>
  19 #include <rte_hash_crc.h>
  20 #include <rte_lpm.h>
  21
  22 #include "task_base.h"
  23 #include "lconf.h"
  24 #include "prefetch.h"
  25 #include "log.h"
  26 #include "defines.h"
  27 #include "handle_master.h"
  28 #include "prox_port_cfg.h"
  29 #include "packet_utils.h"
  30 #include "prox_shared.h"
  31 #include "prox_lua.h"
  32 #include "hash_entry_types.h"
  33 #include "prox_compat.h"
  34 #include "prox_cfg.h"
  35 #include "defines.h"
  36 #include "prox_ipv6.h"
  37 #include "tx_pkt.h"
  38
  39 static inline int find_ip(struct ether_hdr_arp *pkt, uint16_t len, uint32_t *ip_dst, uint16_t *vlan)
  40 {
  41         prox_rte_vlan_hdr *vlan_hdr;
  42         prox_rte_ether_hdr *eth_hdr = (prox_rte_ether_hdr*)pkt;
  43         prox_rte_ipv4_hdr *ip;
  44         uint16_t ether_type = eth_hdr->ether_type;
  45         uint16_t l2_len = sizeof(prox_rte_ether_hdr);
  46
  47         *vlan = 0;
  48         // Unstack VLAN tags
  49         while (((ether_type == ETYPE_8021ad) || (ether_type == ETYPE_VLAN)) && (l2_len + sizeof(prox_rte_vlan_hdr) < len)) {
  50                 vlan_hdr = (prox_rte_vlan_hdr *)((uint8_t *)pkt + l2_len);
  51                 l2_len +=4;
  52                 ether_type = vlan_hdr->eth_proto;
  53                 *vlan = rte_be_to_cpu_16(vlan_hdr->vlan_tci & 0xFF0F);  // Store VLAN, or CVLAN if QinQ
  54         }
  55
  56         switch (ether_type) {
  57         case ETYPE_MPLSU:
  58         case ETYPE_MPLSM:
  59                 // In case of MPLS, next hop MAC is based on MPLS, not destination IP
  60                 l2_len = 0;
  61                 break;
  62         case ETYPE_IPv4:
  63                 break;
  64         case ETYPE_EoGRE:
  65         case ETYPE_ARP:
  66         case ETYPE_IPv6:
  67                 l2_len = 0;
  68                 break;
  69         default:
  70                 l2_len = 0;
  71                 plog_warn("Unsupported packet type %x - CRC might be wrong\n", ether_type);
  72                 break;
  73         }
  74
  75         if (l2_len && (l2_len + sizeof(prox_rte_ipv4_hdr) <= len)) {
  76                 prox_rte_ipv4_hdr *ip = (prox_rte_ipv4_hdr *)((uint8_t *)pkt + l2_len);
  77                 // TODO: implement LPM => replace ip_dst by next hop IP DST
  78                 *ip_dst = ip->dst_addr;
  79                 return 0;
  80         }
  81         return -1;
  82 }
  83
  84 static inline void find_vlan(struct ether_hdr_arp *pkt, uint16_t len, uint16_t *vlan)
  85 {
  86         prox_rte_vlan_hdr *vlan_hdr;
  87         prox_rte_ether_hdr *eth_hdr = (prox_rte_ether_hdr*)pkt;
  88         uint16_t ether_type = eth_hdr->ether_type;
  89         uint16_t l2_len = sizeof(prox_rte_ether_hdr);
  90
  91         *vlan = 0;
  92         // Unstack VLAN tags
  93         while (((ether_type == ETYPE_8021ad) || (ether_type == ETYPE_VLAN)) && (l2_len + sizeof(prox_rte_vlan_hdr) < len)) {
  94                 vlan_hdr = (prox_rte_vlan_hdr *)((uint8_t *)pkt + l2_len);
  95                 l2_len +=4;
  96                 ether_type = vlan_hdr->eth_proto;
  97                 *vlan = rte_be_to_cpu_16(vlan_hdr->vlan_tci & 0xFF0F);  // Store VLAN, or CVLAN if QinQ
  98         }
  99 }
 100
 101 static inline struct ipv6_addr *find_ip6(prox_rte_ether_hdr *pkt, uint16_t len, struct ipv6_addr *ip_dst, uint16_t *vlan)
 102 {
 103         prox_rte_vlan_hdr *vlan_hdr;
 104         prox_rte_ipv6_hdr *ip;
 105         uint16_t ether_type = pkt->ether_type;
 106         uint16_t l2_len = sizeof(prox_rte_ether_hdr);
 107
 108         *vlan = 0;
 109         // Unstack VLAN tags
 110         while (((ether_type == ETYPE_8021ad) || (ether_type == ETYPE_VLAN)) && (l2_len + sizeof(prox_rte_vlan_hdr) < len)) {
 111                 vlan_hdr = (prox_rte_vlan_hdr *)((uint8_t *)pkt + l2_len);
 112                 l2_len +=4;
 113                 ether_type = vlan_hdr->eth_proto;
 114                 *vlan = rte_be_to_cpu_16(vlan_hdr->vlan_tci & 0xFF0F);  // Store VLAN, or CVLAN if QinQ
 115         }
 116
 117         switch (ether_type) {
 118         case ETYPE_MPLSU:
 119         case ETYPE_MPLSM:
 120                 // In case of MPLS, next hop MAC is based on MPLS, not destination IP
 121                 l2_len = 0;
 122                 break;
 123         case ETYPE_IPv4:
 124         case ETYPE_EoGRE:
 125         case ETYPE_ARP:
 126                 l2_len = 0;
 127                 break;
 128         case ETYPE_IPv6:
 129                 break;
 130         default:
 131                 l2_len = 0;
 132                 plog_warn("Unsupported packet type %x - CRC might be wrong\n", ether_type);
 133                 break;
 134         }
 135
 136         if (l2_len && (l2_len + sizeof(prox_rte_ipv6_hdr) <= len)) {
 137                 prox_rte_ipv6_hdr *ip = (prox_rte_ipv6_hdr *)((uint8_t *)pkt + l2_len);
 138                 // TODO: implement LPM => replace ip_dst by next hop IP DST
 139                 memcpy(ip_dst, &ip->dst_addr, sizeof(struct ipv6_addr));
 140                 return (struct ipv6_addr *)&ip->src_addr;
 141         }
 142         return NULL;
 143 }
 144
 145 static void send_unsollicited_neighbour_advertisement(struct task_base *tbase, struct task_args *targ)
 146 {
 147         int ret;
 148         uint8_t out = 0, port_id = tbase->l3.reachable_port_id;
 149         struct rte_mbuf *mbuf;
 150
 151         ret = rte_mempool_get(tbase->l3.arp_nd_pool, (void **)&mbuf);
 152         if (likely(ret == 0)) {
 153                 mbuf->port = port_id;
 154                 build_neighbour_advertisement(tbase->l3.tmaster, mbuf, &prox_port_cfg[port_id].eth_addr, &targ->local_ipv6, PROX_UNSOLLICITED);
 155                 tbase->aux->tx_ctrlplane_pkt(tbase, &mbuf, 1, &out);
 156                 TASK_STATS_ADD_TX_NON_DP(&tbase->aux->stats, 1);
 157         } else {
 158                 plog_err("Failed to get a mbuf from arp/ndp mempool\n");
 159         }
 160 }
 161
 162 static void send_router_sollicitation(struct task_base *tbase, struct task_args *targ)
 163 {
 164         int ret;
 165         uint8_t out = 0, port_id = tbase->l3.reachable_port_id;
 166         struct rte_mbuf *mbuf;
 167
 168         ret = rte_mempool_get(tbase->l3.arp_nd_pool, (void **)&mbuf);
 169         if (likely(ret == 0)) {
 170                 mbuf->port = port_id;
 171                 build_router_sollicitation(mbuf, &prox_port_cfg[port_id].eth_addr, &targ->local_ipv6);
 172                 tbase->aux->tx_ctrlplane_pkt(tbase, &mbuf, 1, &out);
 173                 TASK_STATS_ADD_TX_NON_DP(&tbase->aux->stats, 1);
 174         } else {
 175                 plog_err("Failed to get a mbuf from arp/ndp mempool\n");
 176         }
 177 }
 178
 179 /* This implementation could be improved: instead of checking each time we send a packet whether we need also
 180    to send an ARP, we should only check whether the MAC is valid.
 181    We should check arp_ndp_retransmit_timeout in the master process. This would also require the generating task to clear its arp ring
 182    to avoid sending many ARP while starting after a long stop.
 183    We could also check for reachable_timeout in the master so that dataplane has only to check whether MAC is available
 184    but this would require either thread safety, or the the exchange of information between master and generating core.
 185    */
 186
 187 static inline int add_key_and_send_arp(struct rte_hash *ip_hash, uint32_t *ip_dst, struct arp_table *entries,  uint64_t tsc, uint64_t hz, uint32_t arp_ndp_retransmit_timeout, prox_next_hop_index_type nh, uint64_t **time)
 188 {
 189         int ret = rte_hash_add_key(ip_hash, (const void *)ip_dst);
 190         if (unlikely(ret < 0)) {
 191                 // No reason to send ARP, as reply would be anyhow ignored
 192                 plogx_err("Unable to add ip "IPv4_BYTES_FMT" in mac_hash\n", IP4(*ip_dst));
 193                 return DROP_MBUF;
 194         } else {
 195                 entries[ret].ip = *ip_dst;
 196                 entries[ret].nh = nh;
 197                 *time = &entries[ret].arp_ndp_retransmit_timeout;
 198         }
 199         return SEND_ARP_ND;
 200 }
 201
 202 static inline int update_mac_and_send_mbuf(struct arp_table *entry, prox_rte_ether_addr *mac, uint64_t tsc, uint64_t hz, uint32_t arp_ndp_retransmit_timeout, uint64_t **time)
 203 {
 204         if (likely((tsc < entry->arp_ndp_retransmit_timeout) && (tsc < entry->reachable_timeout))) {
 205                 memcpy(mac, &entry->mac, sizeof(prox_rte_ether_addr));
 206                 return SEND_MBUF;
 207         } else if (tsc > entry->arp_ndp_retransmit_timeout) {
 208                 // long time since we have sent an arp, send arp
 209                 *time = &entry->arp_ndp_retransmit_timeout;
 210                 if (tsc < entry->reachable_timeout){
 211                         // MAC is valid in the table => send also the mbuf
 212                         memcpy(mac, &entry->mac, sizeof(prox_rte_ether_addr));
 213                         return SEND_MBUF_AND_ARP_ND;
 214                 } else {
 215                         // MAC still unknown, or timed out => only send ARP
 216                         return SEND_ARP_ND;
 217                 }
 218         }
 219         // MAC is unknown and we already sent an ARP recently, drop mbuf and wait for ARP reply
 220         return DROP_MBUF;
 221 }
 222
 223 int write_dst_mac(struct task_base *tbase, struct rte_mbuf *mbuf, uint32_t *ip_dst, uint16_t *vlan, uint64_t **time, uint64_t tsc)
 224 {
 225         const uint64_t hz = rte_get_tsc_hz();
 226         struct ether_hdr_arp *packet = rte_pktmbuf_mtod(mbuf, struct ether_hdr_arp *);
 227         prox_rte_ether_addr *mac = &packet->ether_hdr.d_addr;
 228         prox_next_hop_index_type next_hop_index;
 229         static uint64_t last_tsc = 0, n_no_route = 0;
 230
 231         struct l3_base *l3 = &(tbase->l3);
 232
 233         // First find the next hop
 234         if (l3->ipv4_lpm) {
 235                 // A routing table was configured
 236                 // If a gw (gateway_ipv4) is also specified, it is used as default gw only i.e. lowest priority (shortest prefix)
 237                 // This is implemented automatically through lpm
 238                 uint16_t len = rte_pktmbuf_pkt_len(mbuf);
 239                 if (find_ip(packet, len, ip_dst, vlan) != 0) {
 240                         // Unable to find IP address => non IP packet => send it as it
 241                         return SEND_MBUF;
 242                 }
 243                 if (unlikely(rte_lpm_lookup(l3->ipv4_lpm, rte_bswap32(*ip_dst), &next_hop_index) != 0)) {
 244                         // Prevent printing too many messages
 245                         n_no_route++;
 246                         if (tsc > last_tsc + rte_get_tsc_hz()) {
 247                                 plogx_err("No route to IP "IPv4_BYTES_FMT" (%ld times)\n", IP4(*ip_dst), n_no_route);
 248                                 last_tsc = tsc;
 249                                 n_no_route = 0;
 250                         }
 251                         return DROP_MBUF;
 252                 }
 253                 struct arp_table *entry = &l3->next_hops[next_hop_index];
 254
 255                 if (entry->ip) {
 256                         *ip_dst = entry->ip;
 257                         return update_mac_and_send_mbuf(entry, mac, tsc, hz, l3->arp_ndp_retransmit_timeout, time);
 258                 }
 259
 260                 // no next ip: this is a local route
 261                 // Find IP in lookup table. Send ARP if not found
 262                 int ret = rte_hash_lookup(l3->ip_hash, (const void *)ip_dst);
 263                 if (unlikely(ret < 0)) {
 264                         // IP not found, try to send an ARP
 265                         return add_key_and_send_arp(l3->ip_hash, ip_dst, l3->arp_table, tsc, hz, l3->arp_ndp_retransmit_timeout, MAX_HOP_INDEX, time);
 266                 } else {
 267                         return update_mac_and_send_mbuf(&l3->arp_table[ret], mac, tsc, hz, l3->arp_ndp_retransmit_timeout, time);
 268                 }
 269                 return 0;
 270         }
 271         // No Routing table specified: only a local ip and maybe a gateway
 272         // Old default behavior: if a gw is specified, ALL packets go to this gateway (even those we could send w/o the gw
 273
 274         uint16_t len = rte_pktmbuf_pkt_len(mbuf);
 275         if (l3->gw.ip) {
 276                 find_vlan(packet, len, vlan);
 277                 if (likely((l3->flags & FLAG_DST_MAC_KNOWN) && (tsc < l3->gw.arp_ndp_retransmit_timeout) && (tsc < l3->gw.reachable_timeout))) {
 278                         memcpy(mac, &l3->gw.mac, sizeof(prox_rte_ether_addr));
 279                         return SEND_MBUF;
 280                 } else if (tsc > l3->gw.arp_ndp_retransmit_timeout) {
 281                         // long time since we have successfully sent an arp, send arp
 282                         // If sending ARP failed (ring full) then arp_ndp_retransmit_timeout is not updated to avoid having to wait 1 sec to send ARP REQ again
 283                         *time = &l3->gw.arp_ndp_retransmit_timeout;
 284                         l3->gw.arp_ndp_retransmit_timeout = tsc + l3->arp_ndp_retransmit_timeout * hz / 1000;
 285
 286                         *ip_dst = l3->gw.ip;
 287                         if ((l3->flags & FLAG_DST_MAC_KNOWN) && (tsc < l3->gw.reachable_timeout)){
 288                                 // MAC is valid in the table => send also the mbuf
 289                                 memcpy(mac, &l3->gw.mac, sizeof(prox_rte_ether_addr));
 290                                 return SEND_MBUF_AND_ARP_ND;
 291                         } else {
 292                                 // MAC still unknown, or timed out => only send ARP
 293                                 return SEND_ARP_ND;
 294                         }
 295                 } else {
 296                         // MAC is unknown and we already sent an ARP recently, drop mbuf and wait for ARP reply
 297                         return DROP_MBUF;
 298                 }
 299         }
 300
 301         if (find_ip(packet, len, ip_dst, vlan) != 0) {
 302                 // Unable to find IP address => non IP packet => send it as it
 303                 return SEND_MBUF;
 304         }
 305         if (likely(l3->n_pkts < 4)) {
 306                 for (unsigned int idx = 0; idx < l3->n_pkts; idx++) {
 307                         if (*ip_dst == l3->optimized_arp_table[idx].ip) {
 308                                 return update_mac_and_send_mbuf(&l3->optimized_arp_table[idx], mac, tsc, hz, l3->arp_ndp_retransmit_timeout, time);
 309                         }
 310                 }
 311                 // IP address not found in table
 312                 l3->optimized_arp_table[l3->n_pkts].ip = *ip_dst;
 313                 *time = &l3->optimized_arp_table[l3->n_pkts].arp_ndp_retransmit_timeout;
 314                 l3->n_pkts++;
 315
 316                 if (l3->n_pkts < 4) {
 317                         return SEND_ARP_ND;
 318                 }
 319
 320                 // We have too many IP addresses to search linearly; lets use hash table instead => copy all entries in hash table
 321                 for (uint32_t idx = 0; idx < l3->n_pkts; idx++) {
 322                         uint32_t ip = l3->optimized_arp_table[idx].ip;
 323                         int ret = rte_hash_add_key(l3->ip_hash, (const void *)&ip);
 324                         if (ret < 0) {
 325                                 // This should not happen as few entries so far.
 326                                 // If it happens, we still send the ARP as easier:
 327                                 //      If the ARP corresponds to this error, the ARP reply will be ignored
 328                                 //      If ARP does not correspond to this error/ip, then ARP reply will be handled.
 329                                 plogx_err("Unable add ip "IPv4_BYTES_FMT" in mac_hash (already %d entries)\n", IP4(ip), idx);
 330                         } else {
 331                                 memcpy(&l3->arp_table[ret], &l3->optimized_arp_table[idx], sizeof(struct arp_table));
 332                         }
 333                 }
 334                 return SEND_ARP_ND;
 335         } else {
 336                 // Find IP in lookup table. Send ARP if not found
 337                 int ret = rte_hash_lookup(l3->ip_hash, (const void *)ip_dst);
 338                 if (unlikely(ret < 0)) {
 339                         // IP not found, try to send an ARP
 340                         return add_key_and_send_arp(l3->ip_hash, ip_dst, &l3->arp_table[ret], tsc, hz, l3->arp_ndp_retransmit_timeout, MAX_HOP_INDEX, time);
 341                 } else {
 342                         // IP has been found
 343                         return update_mac_and_send_mbuf(&l3->arp_table[ret], mac, tsc, hz, l3->arp_ndp_retransmit_timeout, time);
 344                 }
 345         }
 346         // Should not happen
 347         return DROP_MBUF;
 348 }
 349
 350 int write_ip6_dst_mac(struct task_base *tbase, struct rte_mbuf *mbuf, struct ipv6_addr *ip_dst, uint16_t *vlan)
 351 {
 352         const uint64_t hz = rte_get_tsc_hz();
 353         prox_rte_ether_hdr *packet = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
 354         prox_rte_ether_addr *mac = &packet->d_addr;
 355         struct ipv6_addr *used_ip_src;
 356
 357         uint64_t tsc = rte_rdtsc();
 358         uint16_t len = rte_pktmbuf_pkt_len(mbuf);
 359
 360         struct ipv6_addr *pkt_src_ip6;
 361         if ((pkt_src_ip6 = find_ip6(packet, len, ip_dst, vlan)) == NULL) {
 362                 // Unable to find IP address => non IP packet => send it as it
 363                 return SEND_MBUF;
 364         }
 365         struct l3_base *l3 = &(tbase->l3);
 366         if (memcmp(&l3->local_ipv6, ip_dst, 8) == 0) {
 367                 // Same prefix as local -> use local
 368                 used_ip_src = &l3->local_ipv6;
 369         } else if (memcmp(&l3->global_ipv6 , &null_addr, 16) != 0) {
 370                 // Global IP is defined -> use it
 371                 used_ip_src = &l3->global_ipv6;
 372         } else {
 373                 plog_info("Error as trying to send a packet to "IPv6_BYTES_FMT" using "IPv6_BYTES_FMT" (local)\n", IPv6_BYTES(ip_dst->bytes), IPv6_BYTES(l3->local_ipv6.bytes));
 374                 return DROP_MBUF;
 375         }
 376
 377         memcpy(pkt_src_ip6, used_ip_src, sizeof(struct ipv6_addr));
 378         if (likely(l3->n_pkts < 4)) {
 379                 for (unsigned int idx = 0; idx < l3->n_pkts; idx++) {
 380                         if (memcmp(ip_dst, &l3->optimized_arp_table[idx].ip6, sizeof(struct ipv6_addr)) == 0) {
 381                                  // IP address already in table
 382                                 if ((tsc < l3->optimized_arp_table[idx].arp_ndp_retransmit_timeout) && (tsc < l3->optimized_arp_table[idx].reachable_timeout)) {
 383                                         // MAC address was recently updated in table, use it
 384                                         // plog_dbg("Valid MAC address found => send packet\n");
 385                                         memcpy(mac, &l3->optimized_arp_table[idx].mac, sizeof(prox_rte_ether_addr));
 386                                         return SEND_MBUF;
 387                                 } else if (tsc > l3->optimized_arp_table[idx].arp_ndp_retransmit_timeout) {
 388                                         // NDP not sent since a long time, send NDP
 389                                         l3->optimized_arp_table[idx].arp_ndp_retransmit_timeout = tsc + l3->arp_ndp_retransmit_timeout * hz / 1000;
 390                                         if (tsc < l3->optimized_arp_table[idx].reachable_timeout) {
 391                                                 // MAC still valid => also send mbuf
 392                                                 plog_dbg("Valid MAC found but NDP retransmit timeout => send packet and NDP\n");
 393                                                 memcpy(mac, &l3->optimized_arp_table[idx].mac, sizeof(prox_rte_ether_addr));
 394                                                 return SEND_MBUF_AND_ARP_ND;
 395                                         } else {
 396                                                 plog_dbg("Unknown MAC => send NDP but cannot send packet\n");
 397                                                 // MAC unvalid => only send NDP
 398                                                 return SEND_ARP_ND;
 399                                         }
 400                                 } else {
 401                                         //  NDP timeout elapsed, MAC not valid anymore but waiting for NDP reply
 402                                         // plog_dbg("NDP reachable timeout elapsed - waiting for NDP reply\n");
 403                                         return DROP_MBUF;
 404                                 }
 405                         }
 406                 }
 407                 // IP address not found in table
 408                 memcpy(&l3->optimized_arp_table[l3->n_pkts].ip6, ip_dst, sizeof(struct ipv6_addr));
 409                 l3->optimized_arp_table[l3->n_pkts].arp_ndp_retransmit_timeout = tsc + l3->arp_ndp_retransmit_timeout * hz / 1000;
 410                 l3->n_pkts++;
 411
 412                 if (l3->n_pkts < 4) {
 413                         return SEND_ARP_ND;
 414                 }
 415
 416                 // We have too many IP addresses to search linearly; lets use hash table instead => copy all entries in hash table
 417                 for (uint32_t idx = 0; idx < l3->n_pkts; idx++) {
 418                         struct ipv6_addr *ip6 = &l3->optimized_arp_table[idx].ip6;
 419                         int ret = rte_hash_add_key(l3->ip6_hash, (const void *)ip6);
 420                         if (ret < 0) {
 421                                 // This should not happen as few entries so far.
 422                                 // If it happens, we still send the NDP as easier:
 423                                 //      If the NDP corresponds to this error, the NDP reply will be ignored
 424                                 //      If NDP does not correspond to this error/ip, then NDP reply will be handled.
 425                                 plogx_err("Unable add ip "IPv6_BYTES_FMT" in mac_hash (already %d entries)\n", IPv6_BYTES(ip6->bytes), idx);
 426                         } else {
 427                                 memcpy(&l3->arp_table[ret], &l3->optimized_arp_table[idx], sizeof(struct arp_table));
 428                         }
 429                 }
 430                 return SEND_ARP_ND;
 431         } else {
 432                 // Find IP in lookup table. Send ND if not found
 433                 int ret = rte_hash_lookup(l3->ip6_hash, (const void *)ip_dst);
 434                 if (unlikely(ret < 0)) {
 435                         // IP not found, try to send an ND
 436                         int ret = rte_hash_add_key(l3->ip6_hash, (const void *)ip_dst);
 437                         if (ret < 0) {
 438                                 // No reason to send NDP, as reply would be anyhow ignored
 439                                 plogx_err("Unable to add ip "IPv6_BYTES_FMT" in mac_hash\n", IPv6_BYTES(ip_dst->bytes));
 440                                 return DROP_MBUF;
 441                         } else {
 442                                 memcpy(&l3->arp_table[ret].ip6, ip_dst, sizeof(struct ipv6_addr));
 443                                 l3->arp_table[ret].arp_ndp_retransmit_timeout = tsc + l3->arp_ndp_retransmit_timeout * hz / 1000;
 444                         }
 445                         return SEND_ARP_ND;
 446                 } else {
 447                         // IP has been found
 448                         if (likely((tsc < l3->arp_table[ret].arp_ndp_retransmit_timeout) && (tsc < l3->arp_table[ret].reachable_timeout))) {
 449                                 // MAC still valid and NDP sent recently
 450                                 memcpy(mac, &l3->arp_table[ret].mac, sizeof(prox_rte_ether_addr));
 451                                 return SEND_MBUF;
 452                         } else if (tsc > l3->arp_table[ret].arp_ndp_retransmit_timeout) {
 453                                 // NDP not sent since a long time, send NDP
 454                                 l3->arp_table[ret].arp_ndp_retransmit_timeout = tsc + l3->arp_ndp_retransmit_timeout * hz / 1000;
 455                                 if (tsc < l3->arp_table[ret].reachable_timeout) {
 456                                         // MAC still valid => send also MBUF
 457                                         memcpy(mac, &l3->arp_table[ret].mac, sizeof(prox_rte_ether_addr));
 458                                         return SEND_MBUF_AND_ARP_ND;
 459                                 } else {
 460                                         return SEND_ARP_ND;
 461                                 }
 462                         } else {
 463                                 return DROP_MBUF;
 464                         }
 465                 }
 466         }
 467         // Should not happen
 468         return DROP_MBUF;
 469 }
 470
 471 void task_init_l3(struct task_base *tbase, struct task_args *targ)
 472 {
 473         static char hash_name[30];
 474         uint32_t n_entries = MAX_ARP_ENTRIES * 4;
 475         const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
 476         sprintf(hash_name, "A%03d_%03d_mac_table", targ->lconf->id, targ->id);
 477
 478         hash_name[0]++;
 479
 480         struct rte_hash_parameters hash_params = {
 481                 .name = hash_name,
 482                 .entries = n_entries,
 483                 .key_len = sizeof(uint32_t),
 484                 .hash_func = rte_hash_crc,
 485                 .hash_func_init_val = 0,
 486         };
 487         if (targ->flags & TASK_ARG_L3) {
 488                 plog_info("\t\tInitializing L3 (IPv4)\n");
 489                 tbase->l3.ip_hash = rte_hash_create(&hash_params);
 490                 PROX_PANIC(tbase->l3.ip_hash == NULL, "Failed to set up ip hash table\n");
 491                 hash_name[0]++;
 492         }
 493
 494         if (targ->flags & TASK_ARG_NDP) {
 495                 plog_info("\t\tInitializing NDP (IPv6)\n");
 496                 hash_params.key_len = sizeof(struct ipv6_addr);
 497                 tbase->l3.ip6_hash = rte_hash_create(&hash_params);
 498                 PROX_PANIC(tbase->l3.ip6_hash == NULL, "Failed to set up ip hash table\n");
 499         }
 500         tbase->l3.arp_table = (struct arp_table *)prox_zmalloc(n_entries * sizeof(struct arp_table), socket_id);
 501         PROX_PANIC(tbase->l3.arp_table == NULL, "Failed to allocate memory for %u entries in arp/ndp table\n", n_entries);
 502         plog_info("\t\tarp/ndp table, with %d entries of size %ld\n", n_entries, sizeof(struct l3_base));
 503
 504         targ->lconf->ctrl_func_p[targ->task] = handle_ctrl_plane_pkts;
 505         targ->lconf->ctrl_timeout = freq_to_tsc(targ->ctrl_freq);
 506         tbase->l3.gw.ip = rte_cpu_to_be_32(targ->gateway_ipv4);
 507         tbase->flags |= TASK_L3;
 508         tbase->l3.core_id = targ->lconf->id;
 509         tbase->l3.task_id = targ->id;
 510         tbase->l3.tmaster = targ->tmaster;
 511         tbase->l3.seed = (uint)rte_rdtsc();
 512         if (targ->reachable_timeout != 0)
 513                 tbase->l3.reachable_timeout = targ->reachable_timeout;
 514         else
 515                 tbase->l3.reachable_timeout = DEFAULT_ARP_TIMEOUT;
 516         if (targ->arp_ndp_retransmit_timeout != 0)
 517                 tbase->l3.arp_ndp_retransmit_timeout = targ->arp_ndp_retransmit_timeout;
 518         else
 519                 tbase->l3.arp_ndp_retransmit_timeout = DEFAULT_ARP_UPDATE_TIME;
 520 }
 521
 522 void task_start_l3(struct task_base *tbase, struct task_args *targ)
 523 {
 524         const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
 525         const int NB_ARP_ND_MBUF = 1024;
 526         const int ARP_ND_MBUF_SIZE = 2048;
 527         const int NB_CACHE_ARP_ND_MBUF = 256;
 528
 529         struct prox_port_cfg *port = find_reachable_port(targ);
 530         if (port && (tbase->l3.arp_nd_pool == NULL)) {
 531                 static char name[] = "arp0_pool";
 532                 tbase->l3.reachable_port_id = port - prox_port_cfg;
 533                 if ((targ->local_ipv4 && port->ip) && (targ->local_ipv4 != port->ip)) {
 534                         PROX_PANIC(1, "local_ipv4 in core section ("IPv4_BYTES_FMT") differs from port section ("IPv4_BYTES_FMT")\n", IP4(rte_be_to_cpu_32(targ->local_ipv4)), IP4(rte_be_to_cpu_32(port->ip)));
 535                 }
 536                 if ((targ->local_ipv4 && port->ip) && (targ->local_prefix != port->prefix)) {
 537                         PROX_PANIC(1, "local_ipv4 prefix in core section (%d) differs from port section (%d)\n", targ->local_prefix, port->prefix);
 538                 }
 539                 if (!targ->local_ipv4) {
 540                         targ->local_ipv4 = port->ip;
 541                         targ->local_prefix = port->prefix;
 542                         plog_info("Setting core local_ipv4 from port %d local_ipv4 to "IPv4_BYTES_FMT"\n", tbase->l3.reachable_port_id, IP4(rte_be_to_cpu_32(port->ip)));
 543                 }
 544                 if (targ->local_ipv4) {
 545                         tbase->l3.local_ipv4 = rte_be_to_cpu_32(targ->local_ipv4);
 546                         register_ip_to_ctrl_plane(tbase->l3.tmaster, tbase->l3.local_ipv4, tbase->l3.reachable_port_id, targ->lconf->id, targ->id);
 547                 }
 548                 if (strcmp(targ->route_table, "") != 0) {
 549                         struct lpm4 *lpm;
 550                         int ret;
 551
 552                         PROX_PANIC(tbase->l3.local_ipv4 == 0, "missing local_ipv4 while route table is specified in L3 mode\n");
 553
 554                         // LPM might be modified runtime => do not share with other cores
 555                         ret = lua_to_lpm4(prox_lua(), GLOBAL, targ->route_table, socket_id, &lpm);
 556                         PROX_PANIC(ret, "Failed to load IPv4 LPM:\n%s\n", get_lua_to_errors());
 557
 558                         tbase->l3.ipv4_lpm = lpm->rte_lpm;
 559                         tbase->l3.next_hops = prox_zmalloc(sizeof(*tbase->l3.next_hops) * MAX_HOP_INDEX, socket_id);
 560                         PROX_PANIC(tbase->l3.next_hops == NULL, "Could not allocate memory for next hop\n");
 561
 562                         for (uint32_t i = 0; i < MAX_HOP_INDEX; i++) {
 563                                 if (!lpm->next_hops[i].ip_dst)
 564                                         continue;
 565                                 tbase->l3.nb_gws++;
 566                                 tbase->l3.next_hops[i].ip = rte_bswap32(lpm->next_hops[i].ip_dst);
 567                                 int tx_port = lpm->next_hops[i].mac_port.out_idx;
 568                                 // gen only supports one port right now .... hence port = 0
 569                                 if ((tx_port > targ->nb_txports - 1) && (tx_port > targ->nb_txrings - 1)) {
 570                                         PROX_PANIC(1, "Routing Table contains port %d but only %d tx port/ %d ring:\n", tx_port, targ->nb_txports, targ->nb_txrings);
 571                                 }
 572                         }
 573                         plog_info("Using routing table %s in l3 mode, with %d gateways\n", targ->route_table, tbase->l3.nb_gws);
 574
 575                         // Last but one "next_hop_index" is not a gateway but direct routes
 576                         tbase->l3.next_hops[tbase->l3.nb_gws].ip = 0;
 577                         ret = rte_lpm_add(tbase->l3.ipv4_lpm, targ->local_ipv4, targ->local_prefix, tbase->l3.nb_gws++);
 578                         PROX_PANIC(ret, "Failed to add local_ipv4 "IPv4_BYTES_FMT"/%d to lpm\n", IP4(tbase->l3.local_ipv4), targ->local_prefix);
 579                         // Last "next_hop_index" is default gw
 580                         tbase->l3.next_hops[tbase->l3.nb_gws].ip = rte_bswap32(targ->gateway_ipv4);
 581                         if (targ->gateway_ipv4) {
 582                                 ret = rte_lpm_add(tbase->l3.ipv4_lpm, targ->gateway_ipv4, 0, tbase->l3.nb_gws++);
 583                                 PROX_PANIC(ret, "Failed to add gateway_ipv4 "IPv4_BYTES_FMT"/%d to lpm\n", IP4(tbase->l3.gw.ip), 0);
 584                         }
 585                 }
 586
 587                 master_init_vdev(tbase->l3.tmaster, tbase->l3.reachable_port_id, targ->lconf->id, targ->id);
 588
 589                 // Create IPv6 addr if none were configured
 590                 if (targ->flags & TASK_ARG_NDP) {
 591                         if (!memcmp(&targ->local_ipv6, &null_addr, 16)) {
 592                                 set_link_local(&targ->local_ipv6);
 593                                 set_EUI(&targ->local_ipv6, &port->eth_addr);
 594                         }
 595                         plog_info("\tCore %d, task %d, local IPv6 addr is "IPv6_BYTES_FMT" (%s)\n",
 596                                 targ->lconf->id, targ->id,
 597                                 IPv6_BYTES(targ->local_ipv6.bytes),
 598                                 IP6_Canonical(&targ->local_ipv6));
 599                         memcpy(&tbase->l3.local_ipv6, &targ->local_ipv6, sizeof(struct ipv6_addr));
 600
 601                         if (memcmp(&targ->global_ipv6, &null_addr, sizeof(struct ipv6_addr))) {
 602                                 memcpy(&tbase->l3.global_ipv6, &targ->global_ipv6, sizeof(struct ipv6_addr));
 603                                 plog_info("\tCore %d, task %d, global IPv6 addr is "IPv6_BYTES_FMT" (%s)\n",
 604                                         targ->lconf->id, targ->id,
 605                                         IPv6_BYTES(targ->global_ipv6.bytes),
 606                                         IP6_Canonical(&targ->global_ipv6));
 607                         }
 608                         if (targ->ipv6_router)
 609                                 register_router_to_ctrl_plane(tbase->l3.tmaster, tbase->l3.reachable_port_id, targ->lconf->id, targ->id, &targ->local_ipv6, &targ->global_ipv6, &targ->router_prefix);
 610                         else
 611                                 register_node_to_ctrl_plane(tbase->l3.tmaster, &targ->local_ipv6, &targ->global_ipv6, tbase->l3.reachable_port_id, targ->lconf->id, targ->id);
 612                 }
 613
 614                 name[3]++;
 615                 struct rte_mempool *ret = rte_mempool_create(name, NB_ARP_ND_MBUF, ARP_ND_MBUF_SIZE, NB_CACHE_ARP_ND_MBUF,
 616                         sizeof(struct rte_pktmbuf_pool_private), rte_pktmbuf_pool_init, NULL, rte_pktmbuf_init, 0,
 617                         rte_socket_id(), 0);
 618                 PROX_PANIC(ret == NULL, "Failed to allocate ARP/ND memory pool on socket %u with %u elements\n",
 619                         rte_socket_id(), NB_ARP_ND_MBUF);
 620                 plog_info("\tMempool %p (%s) size = %u * %u cache %u, socket %d (for ARP/ND)\n", ret, name, NB_ARP_ND_MBUF,
 621                         ARP_ND_MBUF_SIZE, NB_CACHE_ARP_ND_MBUF, rte_socket_id());
 622                 tbase->l3.arp_nd_pool = ret;
 623                 if ((targ->flags & TASK_ARG_NDP) && (!targ->ipv6_router)) {
 624                         plog_info("Sending Router Sollicitation\n");
 625                         send_router_sollicitation(tbase, targ);
 626                 }
 627                 if ((targ->flags & TASK_ARG_NDP) && (targ->flags & TASK_ARG_SEND_NA_AT_STARTUP)) {
 628                         plog_info("Sending unsollicited Neighbour Advertisement\n");
 629                         send_unsollicited_neighbour_advertisement(tbase, targ);
 630
 631                 }
 632         }
 633 }
 634
 635 void task_set_gateway_ip(struct task_base *tbase, uint32_t ip)
 636 {
 637         tbase->l3.gw.ip = ip;
 638         tbase->flags &= ~FLAG_DST_MAC_KNOWN;
 639 }
 640
 641 void task_set_local_ip(struct task_base *tbase, uint32_t ip)
 642 {
 643         tbase->l3.local_ipv4 = ip;
 644 }
 645
 646 static void reset_arp_ndp_retransmit_timeout(struct l3_base *l3, uint32_t ip)
 647 {
 648         uint32_t idx;
 649         plogx_dbg("MAC entry for IP "IPv4_BYTES_FMT" timeout in kernel\n", IP4(ip));
 650
 651         if (l3->ipv4_lpm) {
 652                 int ret = rte_hash_lookup(l3->ip_hash, (const void *)&ip);
 653                 if (ret >= 0)
 654                         l3->arp_table[ret].arp_ndp_retransmit_timeout = 0;
 655         } else if (ip == l3->gw.ip) {
 656                 l3->gw.arp_ndp_retransmit_timeout = 0;
 657         } else if (l3->n_pkts < 4) {
 658                 for (idx = 0; idx < l3->n_pkts; idx++) {
 659                         uint32_t ip_dst = l3->optimized_arp_table[idx].ip;
 660                         if (ip_dst == ip)
 661                                 break;
 662                 }
 663                 if (idx < l3->n_pkts) {
 664                         l3->optimized_arp_table[idx].arp_ndp_retransmit_timeout = 0;
 665                 }
 666         } else {
 667                 int ret = rte_hash_lookup(l3->ip_hash, (const void *)&ip);
 668                 if (ret >= 0)
 669                         l3->arp_table[ret].arp_ndp_retransmit_timeout = 0;
 670         }
 671         return;
 672 }
 673
 674 static prox_next_hop_index_type get_nh_index(struct task_base *tbase, uint32_t gw_ip)
 675 {
 676         // Check if gateway already exists
 677         for (prox_next_hop_index_type i = 0; i < tbase->l3.nb_gws; i++) {
 678                 if (tbase->l3.next_hops[i].ip == gw_ip) {
 679                         return i;
 680                 }
 681         }
 682         if (tbase->l3.nb_gws < MAX_HOP_INDEX) {
 683                 tbase->l3.next_hops[tbase->l3.nb_gws].ip = gw_ip;
 684                 tbase->l3.nb_gws++;
 685                 return tbase->l3.nb_gws - 1;
 686         } else
 687                 return MAX_HOP_INDEX;
 688 }
 689 void handle_ctrl_plane_pkts(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
 690 {
 691         uint8_t out[1];
 692         const uint64_t hz = rte_get_tsc_hz();
 693         uint32_t ip, ip_dst, idx, gateway_ip, prefix;
 694         prox_next_hop_index_type gateway_index;
 695         int j, ret, modified_route;
 696         uint64_t addr;
 697         struct ipv6_addr *ip6, *ip6_dst;
 698         uint16_t command;
 699         prox_rte_ether_hdr *hdr;
 700         struct ether_hdr_arp *hdr_arp;
 701         struct l3_base *l3 = &tbase->l3;
 702         uint64_t tsc= rte_rdtsc();
 703         uint64_t reachable_timeout = l3->reachable_timeout * hz / 1000;
 704         uint32_t nh;
 705         prox_rte_ipv4_hdr *pip;
 706         prox_rte_udp_hdr *udp_hdr;
 707         uint8_t port = tbase->l3.reachable_port_id;
 708
 709         for (j = 0; j < n_pkts; ++j) {
 710                 PREFETCH0(mbufs[j]);
 711         }
 712         for (j = 0; j < n_pkts; ++j) {
 713                 PREFETCH0(rte_pktmbuf_mtod(mbufs[j], void *));
 714         }
 715
 716         for (j = 0; j < n_pkts; ++j) {
 717                 pip = NULL;
 718                 udp_hdr = NULL;
 719                 out[0] = OUT_HANDLED;
 720                 command = get_command(mbufs[j]);
 721                 plogx_dbg("\tReceived %s mbuf %p\n", actions_string[command], mbufs[j]);
 722                 switch(command) {
 723                 case ROUTE_ADD_FROM_MASTER:
 724                         ip = ctrl_ring_get_ip(mbufs[j]);
 725                         gateway_ip = ctrl_ring_get_gateway_ip(mbufs[j]);
 726                         prefix = ctrl_ring_get_prefix(mbufs[j]);
 727                         gateway_index = get_nh_index(tbase, gateway_ip);
 728                         if (gateway_index >= MAX_HOP_INDEX) {
 729                                 plog_err("Unable to find or define gateway index - too many\n");
 730                                 return;
 731                         }
 732                         modified_route = rte_lpm_is_rule_present(tbase->l3.ipv4_lpm, rte_bswap32(ip), prefix, &nh);
 733                         ret = rte_lpm_add(tbase->l3.ipv4_lpm, rte_bswap32(ip), prefix, gateway_index);
 734                         if (ret < 0) {
 735                                 plog_err("Failed to add route to "IPv4_BYTES_FMT"/%d using "IPv4_BYTES_FMT"(index = %d)\n", IP4(ip), prefix, IP4(gateway_ip), gateway_index);
 736                         } else if (modified_route)
 737                                 plogx_dbg("Modified route to "IPv4_BYTES_FMT"/%d using "IPv4_BYTES_FMT"(index = %d) (was using "IPv4_BYTES_FMT"(index = %d)\n", IP4(ip), prefix, IP4(gateway_ip), gateway_index, IP4(tbase->l3.next_hops[nh].ip), nh);
 738                         else {
 739                                 plogx_dbg("Added new route to "IPv4_BYTES_FMT"/%d using "IPv4_BYTES_FMT"(index = %d)\n", IP4(ip), prefix, IP4(gateway_ip), gateway_index);
 740                         }
 741                         tx_drop(mbufs[j]);
 742                         break;
 743                 case ROUTE_DEL_FROM_MASTER:
 744                         ip = ctrl_ring_get_ip(mbufs[j]);
 745                         prefix = ctrl_ring_get_prefix(mbufs[j]);
 746
 747                         ret = rte_lpm_is_rule_present(tbase->l3.ipv4_lpm, rte_bswap32(ip), prefix, &nh);
 748                         if (ret > 0) {
 749                                 ret = rte_lpm_delete(tbase->l3.ipv4_lpm, rte_bswap32(ip), prefix);
 750                                 if (ret < 0) {
 751                                         plog_err("Failed to add rule\n");
 752                                 }
 753                                 plog_info("Deleting route to "IPv4_BYTES_FMT"/%d\n", IP4(ip), prefix);
 754                         }
 755                         tx_drop(mbufs[j]);
 756                         break;
 757                 case MAC_INFO_FROM_MASTER:
 758                         hdr_arp = rte_pktmbuf_mtod(mbufs[j], struct ether_hdr_arp *);
 759                         ip = get_ip(mbufs[j]);
 760
 761                         if (prox_rte_is_zero_ether_addr(&hdr_arp->arp.data.sha)) {
 762                                 // MAC timeout or deleted from kernel table => reset update_time
 763                                 // This will cause us to send new ARP request
 764                                 // However, as reachable_timeout not touched, we should continue sending our regular IP packets
 765                                 reset_arp_ndp_retransmit_timeout(l3, ip);
 766                                 return;
 767                         } else
 768                                 plogx_dbg("\tUpdating MAC entry for IP "IPv4_BYTES_FMT" with MAC "MAC_BYTES_FMT"\n",
 769                                         IP4(ip), MAC_BYTES(hdr_arp->arp.data.sha.addr_bytes));
 770
 771                         if (l3->ipv4_lpm) {
 772                                 uint32_t nh;
 773                                 struct arp_table *entry;
 774                                 ret = rte_hash_add_key(l3->ip_hash, (const void *)&ip);
 775                                 if (ret < 0) {
 776                                         plogx_info("Unable add ip "IPv4_BYTES_FMT" in mac_hash\n", IP4(ip));
 777                                 } else if ((nh = l3->arp_table[ret].nh) != MAX_HOP_INDEX) {
 778                                         entry = &l3->next_hops[nh];
 779                                         memcpy(&entry->mac, &(hdr_arp->arp.data.sha), sizeof(prox_rte_ether_addr));
 780                                         entry->reachable_timeout = tsc + reachable_timeout;
 781                                         update_arp_ndp_retransmit_timeout(l3, &entry->arp_ndp_retransmit_timeout, l3->arp_ndp_retransmit_timeout);
 782                                 } else {
 783                                         memcpy(&l3->arp_table[ret].mac, &(hdr_arp->arp.data.sha), sizeof(prox_rte_ether_addr));
 784                                         l3->arp_table[ret].reachable_timeout = tsc + reachable_timeout;
 785                                         update_arp_ndp_retransmit_timeout(l3, &l3->arp_table[ret].arp_ndp_retransmit_timeout, l3->arp_ndp_retransmit_timeout);
 786                                 }
 787                         }
 788                         else if (ip == l3->gw.ip) {
 789                                 // MAC address of the gateway
 790                                 memcpy(&l3->gw.mac, &hdr_arp->arp.data.sha, 6);
 791                                 l3->flags |= FLAG_DST_MAC_KNOWN;
 792                                 l3->gw.reachable_timeout = tsc + reachable_timeout;
 793                                 update_arp_ndp_retransmit_timeout(l3, &l3->gw.arp_ndp_retransmit_timeout, l3->arp_ndp_retransmit_timeout);
 794                         } else if (l3->n_pkts < 4) {
 795                                 // Few packets tracked - should be faster to loop through them thean using a hash table
 796                                 for (idx = 0; idx < l3->n_pkts; idx++) {
 797                                         ip_dst = l3->optimized_arp_table[idx].ip;
 798                                         if (ip_dst == ip)
 799                                                 break;
 800                                 }
 801                                 if (idx < l3->n_pkts) {
 802                                         memcpy(&l3->optimized_arp_table[idx].mac, &(hdr_arp->arp.data.sha), sizeof(prox_rte_ether_addr));
 803                                         l3->optimized_arp_table[idx].reachable_timeout = tsc + reachable_timeout;
 804                                         update_arp_ndp_retransmit_timeout(l3, &l3->optimized_arp_table[idx].arp_ndp_retransmit_timeout, l3->arp_ndp_retransmit_timeout);
 805                                 }
 806                         } else {
 807                                 ret = rte_hash_add_key(l3->ip_hash, (const void *)&ip);
 808                                 if (ret < 0) {
 809                                         plogx_info("Unable add ip "IPv4_BYTES_FMT" in mac_hash\n", IP4(ip));
 810                                 } else {
 811                                         memcpy(&l3->arp_table[ret].mac, &(hdr_arp->arp.data.sha), sizeof(prox_rte_ether_addr));
 812                                         l3->arp_table[ret].reachable_timeout = tsc + reachable_timeout;
 813                                         update_arp_ndp_retransmit_timeout(l3, &l3->arp_table[ret].arp_ndp_retransmit_timeout, l3->arp_ndp_retransmit_timeout);
 814                                 }
 815                         }
 816                         tx_drop(mbufs[j]);
 817                         break;
 818                 case MAC_INFO_FROM_MASTER_FOR_IPV6:
 819                         ip6 = ctrl_ring_get_ipv6_addr(mbufs[j]);
 820                         uint64_t data = ctrl_ring_get_data(mbufs[j]);
 821
 822                         if (l3->n_pkts < 4) {
 823                                 // Few packets tracked - should be faster to loop through them thean using a hash table
 824                                 for (idx = 0; idx < l3->n_pkts; idx++) {
 825                                         ip6_dst = &l3->optimized_arp_table[idx].ip6;
 826                                         if (memcmp(ip6_dst, ip6, sizeof(struct ipv6_addr)) == 0)
 827                                                 break;
 828                                 }
 829                                 if (idx < l3->n_pkts) {
 830                                         // IP found; this is a reply for one of our requests!
 831                                         memcpy(&l3->optimized_arp_table[idx].mac, &data, sizeof(prox_rte_ether_addr));
 832                                         l3->optimized_arp_table[idx].reachable_timeout = tsc + l3->reachable_timeout * hz / 1000;
 833                                 }
 834                         } else {
 835                                 int ret = rte_hash_add_key(l3->ip6_hash, (const void *)ip6);
 836                                 if (ret < 0) {
 837                                         plogx_info("Unable add ip "IPv6_BYTES_FMT" in mac_hash\n", IPv6_BYTES(ip6->bytes));
 838                                 } else {
 839                                         memcpy(&l3->arp_table[ret].mac, &data, sizeof(prox_rte_ether_addr));
 840                                         l3->arp_table[ret].reachable_timeout = tsc + l3->reachable_timeout * hz / 1000;
 841                                 }
 842                         }
 843                         tx_drop(mbufs[j]);
 844                         break;
 845                 case SEND_NDP_FROM_MASTER:
 846                 case SEND_ARP_REQUEST_FROM_MASTER:
 847                 case SEND_ARP_REPLY_FROM_MASTER:
 848                         out[0] = 0;
 849                         // tx_ctrlplane_pkt does not drop packets
 850                         plogx_dbg("\tForwarding (ARP) packet from master\n");
 851                         tbase->aux->tx_ctrlplane_pkt(tbase, &mbufs[j], 1, out);
 852                         TASK_STATS_ADD_TX_NON_DP(&tbase->aux->stats, 1);
 853                         break;
 854                 case SEND_ICMP_FROM_MASTER:
 855                         out[0] = 0;
 856                         // tx_ctrlplane_pkt does not drop packets
 857                         plogx_dbg("\tForwarding (PING) packet from master\n");
 858                         tbase->aux->tx_ctrlplane_pkt(tbase, &mbufs[j], 1, out);
 859                         TASK_STATS_ADD_TX_NON_DP(&tbase->aux->stats, 1);
 860                         break;
 861                 case PKT_FROM_TAP:
 862                         // Drop Pseudo packets sent to generate ARP requests
 863                         // There are other IPv4 packets sent from TAP which we cannot delete e.g. BGP packets
 864                         out[0] = 0;
 865                         hdr = rte_pktmbuf_mtod(mbufs[j], prox_rte_ether_hdr *);
 866                         if (hdr->ether_type == ETYPE_IPv4) {
 867                                 pip = (prox_rte_ipv4_hdr *)(hdr + 1);
 868                         } else if (hdr->ether_type == ETYPE_VLAN) {
 869                                 prox_rte_vlan_hdr *vlan = (prox_rte_vlan_hdr *)(hdr + 1);
 870                                 vlan = (prox_rte_vlan_hdr *)(hdr + 1);
 871                                 if (vlan->eth_proto == ETYPE_IPv4) {
 872                                         pip = (prox_rte_ipv4_hdr *)(vlan + 1);
 873                                 }
 874                         }
 875                         if (pip && (pip->next_proto_id == IPPROTO_UDP)) {
 876                                 udp_hdr = (prox_rte_udp_hdr *)(pip + 1);
 877                                 if ((udp_hdr->dst_port == rte_cpu_to_be_16(PROX_PSEUDO_PKT_PORT)) &&
 878                                         (udp_hdr->src_port == rte_cpu_to_be_16(PROX_PSEUDO_PKT_PORT)) &&
 879                                         (rte_be_to_cpu_16(udp_hdr->dgram_len) == 8)) {
 880                                         plogx_dbg("Dropping PROX packet\n");
 881                                         tx_drop(mbufs[j]);
 882                                         return;
 883                                 }
 884                         }
 885 /* Debugging ...
 886                         uint16_t src_port = 0, dst_port = 0, len = 0;
 887                         if (udp_hdr) {
 888                                 src_port = udp_hdr->src_port;
 889                                 dst_port = udp_hdr->dst_port;
 890                                 len = rte_be_to_cpu_16(udp_hdr->dgram_len);
 891                         }
 892                         plogx_dbg("tForwarding TAP packet from master. Type = %x, pip=%p, udp = %p, udp = {src = %x, dst = %x, len = %d}\n", hdr->ether_type, pip, udp_hdr, src_port, dst_port,len );
 893 */
 894                         // tx_ctrlplane_pkt does not drop packets
 895                         tbase->aux->tx_ctrlplane_pkt(tbase, &mbufs[j], 1, out);
 896                         TASK_STATS_ADD_TX_NON_DP(&tbase->aux->stats, 1);
 897                         break;
 898                 case IPV6_INFO_FROM_MASTER:
 899                         // addr = ctrl_ring_get_data(mbufs[j]);
 900                         ip6 = ctrl_ring_get_ipv6_addr(mbufs[j]);
 901                         if (memcmp(&l3->global_ipv6 , &null_addr, 16) == 0) {
 902                                 memcpy(&l3->global_ipv6, ip6, sizeof(struct ipv6_addr));
 903                                 plog_info("Core %d task %d received global IP "IPv6_BYTES_FMT"\n", l3->core_id, l3->task_id, IPv6_BYTES(ip6->bytes));
 904                         } else if (memcmp(&l3->global_ipv6, ip6, 8) == 0) {
 905                                 if (l3->prefix_printed == 0) {
 906                                         plog_info("Core %d task %d received expected prefix "IPv6_PREFIX_FMT"\n", l3->core_id, l3->task_id, IPv6_PREFIX(ip6->bytes));
 907                                         l3->prefix_printed = 1;
 908                                 }
 909                         } else {
 910                                 plog_warn("Core %d task %d received unexpected prefix "IPv6_PREFIX_FMT", IP = "IPv6_PREFIX_FMT"\n", l3->core_id, l3->task_id, IPv6_PREFIX(ip6->bytes), IPv6_PREFIX(l3->global_ipv6.bytes));
 911                         }
 912                         tx_drop(mbufs[j]);
 913                         break;
 914                 default:
 915                         plog_err("Unexpected message received: %d\n", command);
 916                         tx_drop(mbufs[j]);
 917                         break;
 918                 }
 919         }
 920 }