1 files changed, 475 insertions, 0 deletions

diff --git a/extras/libmemif/examples/common/icmp_proto.c b/extras/libmemif/examples/common/icmp_proto.c
new file mode 100644
index 00000000000..70825eafdb2
--- /dev/null
+++ b/extras/libmemif/examples/common/icmp_proto.c
@@ -0,0 +1,475 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * 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 <stdint.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdio.h>
+#include <netdb.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <asm/byteorder.h>
+#include <byteswap.h>
+#include <assert.h>
+
+#include <icmp_proto.h>
+
+static uint16_t
+cksum (void *addr, ssize_t len)
+{
+  char *data = (char *) addr;
+
+  uint32_t acc = 0xffff;
+
+  ssize_t i;
+  for (i = 0; (i + 1) < len; i += 2)
+    {
+      uint16_t word;
+      memcpy (&word, data + i, 2);
+      acc += ntohs (word);
+      if (acc > 0xffff)
+	acc -= 0xffff;
+    }
+
+  if (len & 1)
+    {
+      uint16_t word = 0;
+      memcpy (&word, data + len - 1, 1);
+      acc += ntohs (word);
+      if (acc > 0xffff)
+	acc -= 0xffff;
+    }
+  return htons (~acc);
+}
+
+int
+print_packet (void *pck)
+{
+  if (pck == NULL)
+    {
+      printf ("ICMP_PROTO: no data\n");
+      return -1;
+    }
+  struct iphdr *ip;
+  struct icmphdr *icmp;
+  ip = (struct iphdr *) pck;
+  icmp = (struct icmphdr *) (pck + sizeof (struct iphdr));
+  printf ("received packet:\n");
+  printf ("\tiphdr:\n");
+  printf ("\t\tihl: %u\n\t\tversion: %u\n\t\tlen: %u\n\t\tid: %u\n", ip->ihl,
+	  ip->version, __bswap_16 (ip->tot_len), ip->id);
+  printf ("\t\tprotocol: %u\n", ip->protocol);
+
+  printf ("\t\tsaddr: ");
+  int i;
+  for (i = 0; i < 4; i++)
+    {
+      printf ("%u.", ((uint8_t *) &ip->saddr)[i]);
+    }
+  printf ("\n");
+
+  printf ("\t\tdaddr: ");
+  for (i = 0; i < 4; i++)
+    {
+      printf ("%u.", ((uint8_t *) &ip->daddr)[i]);
+    }
+  printf ("\n");
+  printf ("\ticmphdr:\n");
+  printf ("\t\ttype: %s\n",
+	  (icmp->type == ICMP_ECHO) ? "ICMP_ECHO" : "ICMP_ECHOREPLY");
+
+  return 0;
+}
+
+static ssize_t
+resolve_arp (void *arp)
+{
+  struct arphdr *resp = (struct arphdr *) arp;
+
+  resp->ar_hrd = __bswap_16 (ARPHRD_ETHER);
+
+  resp->ar_pro = __bswap_16 (0x0800);
+
+  resp->ar_hln = 6;
+  resp->ar_pln = 4;
+
+  resp->ar_op = __bswap_16 (ARPOP_REPLY);
+
+  return sizeof (struct arphdr);
+}
+
+static ssize_t
+resolve_eth_arp (struct ether_arp *eth_arp, void *eth_arp_resp,
+		 uint8_t ip_addr[4])
+{
+  struct ether_arp *resp = (struct ether_arp *) eth_arp_resp;
+
+  resolve_arp (&resp->ea_hdr);
+
+  memcpy (resp->arp_tha, eth_arp->arp_sha, 6);
+  memcpy (resp->arp_tpa, eth_arp->arp_spa, 4);
+
+  memcpy (
+    resp->arp_sha,
+    (((struct ether_header *) (eth_arp_resp - sizeof (struct ether_header)))
+       ->ether_shost),
+    6);
+
+  memcpy (resp->arp_spa, ip_addr, 4);
+
+  return sizeof (struct ether_arp);
+}
+
+static ssize_t
+resolve_eth (struct ether_header *eth, void *eth_resp, uint8_t hw_addr[6])
+{
+  struct ether_header *resp = (struct ether_header *) eth_resp;
+  memcpy (resp->ether_dhost, eth->ether_shost, 6);
+
+  memcpy (resp->ether_shost, hw_addr, 6);
+
+  resp->ether_type = eth->ether_type;
+
+  return sizeof (struct ether_header);
+}
+
+static ssize_t
+resolve_ip (struct iphdr *ip, void *ip_resp, uint8_t ip_addr[4])
+{
+  struct iphdr *resp = (struct iphdr *) ip_resp;
+  resp->ihl = 5;
+  resp->version = 4;
+  resp->tos = 0;
+  /*len updated later */
+  resp->tot_len = 0x0000;
+  resp->id = 0;
+  resp->frag_off = 0;
+  resp->ttl = 0x40;
+  resp->protocol = 1;
+  ((uint8_t *) &resp->saddr)[0] = ip_addr[0];
+  ((uint8_t *) &resp->saddr)[1] = ip_addr[1];
+  ((uint8_t *) &resp->saddr)[2] = ip_addr[2];
+  ((uint8_t *) &resp->saddr)[3] = ip_addr[3];
+  resp->daddr = ip->saddr;
+
+  /* resp->check =  cksum (resp, sizeof (struct iphdr)); */
+
+  return sizeof (struct iphdr);
+}
+
+static ssize_t
+resolve_icmp (struct icmphdr *icmp, void *icmp_resp)
+{
+  struct icmphdr *resp = (struct icmphdr *) icmp_resp;
+  resp->type = 0x00;
+  resp->code = 0;
+  resp->un.echo.id = icmp->un.echo.id;
+  resp->un.echo.sequence = icmp->un.echo.sequence;
+
+  /*resp->checksum = cksum (resp, sizeof (struct icmphdr)); */
+
+  return sizeof (struct icmphdr);
+}
+
+static ssize_t
+generate_eth (struct ether_header *eh, uint8_t hw_daddr[6])
+{
+  uint8_t hw_addr[6];
+  int i;
+  for (i = 0; i < 6; i++)
+    {
+      hw_addr[i] = 'a';
+    }
+  memcpy (eh->ether_shost, hw_addr, 6);
+  memcpy (eh->ether_dhost, hw_daddr, 6);
+
+  eh->ether_type = 0x0008;
+
+  return sizeof (struct ether_header);
+}
+
+static ssize_t
+generate_ip (struct iphdr *ip, uint8_t saddr[4], uint8_t daddr[4])
+{
+  ip->ihl = 5;
+  ip->version = 4;
+  ip->tos = 0;
+  /*len updated later */
+  ip->tot_len = 0x5400;
+  ip->id = 0;
+  ip->frag_off = 0;
+  ip->ttl = 0x40;
+  ip->protocol = 1;
+  /* saddr */
+  ((uint8_t *) &ip->saddr)[0] = saddr[0];
+  ((uint8_t *) &ip->saddr)[1] = saddr[1];
+  ((uint8_t *) &ip->saddr)[2] = saddr[2];
+  ((uint8_t *) &ip->saddr)[3] = saddr[3];
+  /* daddr */
+  ((uint8_t *) &ip->daddr)[0] = daddr[0];
+  ((uint8_t *) &ip->daddr)[1] = daddr[1];
+  ((uint8_t *) &ip->daddr)[2] = daddr[2];
+  ((uint8_t *) &ip->daddr)[3] = daddr[3];
+
+  ip->check = cksum (ip, sizeof (struct iphdr));
+
+  return sizeof (struct iphdr);
+}
+
+static ssize_t
+generate_icmp (struct icmphdr *icmp, uint32_t seq)
+{
+  icmp->type = ICMP_ECHO;
+  icmp->code = 0;
+  icmp->un.echo.id = 0;
+  icmp->un.echo.sequence = seq;
+
+  return sizeof (struct icmphdr);
+}
+
+int
+generate_packet (void *pck, uint32_t *size, uint8_t saddr[4], uint8_t daddr[4],
+		 uint8_t hw_daddr[6], uint32_t seq)
+{
+  struct ether_header *eh;
+  struct iphdr *ip;
+  struct icmphdr *icmp;
+
+  *size = 0;
+
+  eh = (struct ether_header *) pck;
+  *size += generate_eth (eh, hw_daddr);
+
+  ip = (struct iphdr *) (pck + *size);
+  *size += generate_ip (ip, saddr, daddr);
+
+  icmp = (struct icmphdr *) (pck + *size);
+  *size += generate_icmp (icmp, seq);
+
+  ((struct icmphdr *) (pck + *size - sizeof (struct icmphdr)))->checksum =
+    cksum (pck + *size - sizeof (struct icmphdr), sizeof (struct icmphdr));
+
+  ip->tot_len = __bswap_16 (*size - sizeof (struct ether_header));
+  ip->check = 0;
+  ip->check = cksum (ip, sizeof (struct iphdr));
+
+  return 0;
+}
+
+int
+generate_packet2 (void *pck, uint32_t *size, uint8_t saddr[4],
+		  uint8_t daddr[4], uint8_t hw_daddr[6], uint32_t seq,
+		  icmpr_flow_mode_t mode)
+{
+  struct ether_header *eh;
+  struct iphdr *ip;
+  struct icmphdr *icmp;
+
+  *size = 0;
+
+  if (mode == ICMPR_FLOW_MODE_ETH)
+    {
+      eh = (struct ether_header *) pck;
+      *size += generate_eth (eh, hw_daddr);
+    }
+
+  ip = (struct iphdr *) (pck + *size);
+  *size += generate_ip (ip, saddr, daddr);
+
+  icmp = (struct icmphdr *) (pck + *size);
+  *size += generate_icmp (icmp, seq);
+
+  ((struct icmphdr *) (pck + *size - sizeof (struct icmphdr)))->checksum =
+    cksum (pck + *size - sizeof (struct icmphdr), sizeof (struct icmphdr));
+
+  ip->tot_len = __bswap_16 (*size - sizeof (struct ether_header));
+  ip->check = 0;
+  ip->check = cksum (ip, sizeof (struct iphdr));
+
+  return 0;
+}
+
+#define GET_HEADER(out, hdr, src, off)                                        \
+  do                                                                          \
+    {                                                                         \
+      out = (hdr *) (src + off);                                              \
+      off += sizeof (hdr);                                                    \
+    }                                                                         \
+  while (0)
+
+int
+resolve_packet (void *pck, uint32_t *size, uint8_t ip_addr[4],
+		uint8_t hw_addr[6])
+{
+  struct ether_header *eh;
+  struct ether_arp *eah;
+  struct iphdr *ip;
+  struct icmphdr *icmp;
+  uint32_t offset = 0;
+
+  if (pck == NULL)
+    return 0;
+
+#ifdef ICMP_DBG
+  print_packet (pck);
+#endif
+
+  GET_HEADER (eh, struct ether_header, pck, offset);
+
+  memcpy (eh->ether_dhost, eh->ether_shost, 6);
+  memcpy (eh->ether_shost, hw_addr, 6);
+
+  if (eh->ether_type == 0x0608)
+    {
+      GET_HEADER (eah, struct ether_arp, pck, offset);
+      struct arphdr *arp = &eah->ea_hdr;
+
+      arp->ar_hrd = __bswap_16 (ARPHRD_ETHER);
+      arp->ar_pro = __bswap_16 (0x0800);
+
+      arp->ar_hln = 6;
+      arp->ar_pln = 4;
+
+      arp->ar_op = __bswap_16 (ARPOP_REPLY);
+
+      memcpy (eah->arp_tha, eah->arp_sha, 6);
+      memcpy (eah->arp_tpa, eah->arp_spa, 4);
+
+      memcpy (eah->arp_sha, eh->ether_shost, 6);
+      memcpy (eah->arp_spa, ip_addr, 4);
+    }
+
+  else if (eh->ether_type == 0x0008)
+    {
+      GET_HEADER (ip, struct iphdr, pck, offset);
+
+      if (ip->protocol == 1)
+	{
+	  ip->ihl = 5;
+	  ip->version = 4;
+	  ip->tos = 0;
+	  ip->tot_len = 0x0000;
+	  ip->id = 0;
+	  ip->frag_off = 0;
+	  ip->ttl = 0x40;
+	  ip->protocol = 1;
+	  ip->check = 0x0000;
+	  ip->daddr = ip->saddr;
+	  ((uint8_t *) &ip->saddr)[0] = ip_addr[0];
+	  ((uint8_t *) &ip->saddr)[1] = ip_addr[1];
+	  ((uint8_t *) &ip->saddr)[2] = ip_addr[2];
+	  ((uint8_t *) &ip->saddr)[3] = ip_addr[3];
+
+	  GET_HEADER (icmp, struct icmphdr, pck, offset);
+
+	  icmp->type = 0x00;
+	  icmp->code = 0;
+	  icmp->checksum = cksum (icmp, sizeof (struct icmphdr));
+
+	  /* rest is payload */
+	  offset = *size;
+
+	  ip->tot_len = __bswap_16 (offset - sizeof (struct ether_header));
+	  ip->check = cksum (ip, sizeof (struct iphdr));
+	}
+    }
+
+  assert (offset == *size && "unsupported protocol");
+  return 0;
+}
+
+int
+resolve_packet_with_encap (void **pck_, uint32_t *size, uint8_t ip_addr[4])
+{
+  struct ether_header *eh;
+  struct iphdr *ip;
+  struct icmphdr *icmp;
+  int32_t offset = 0;
+  uint16_t encap_size = sizeof (struct ether_header);
+  void *pck = *pck_;
+
+  if (pck == NULL)
+    return 0;
+
+  *pck_ -= encap_size;
+  offset -= encap_size;
+
+  GET_HEADER (eh, struct ether_header, pck, offset);
+
+  uint8_t hw_daddr[6];
+  memset (hw_daddr, 0, sizeof (uint8_t) * 6);
+
+  generate_eth (eh, hw_daddr);
+
+  if (eh->ether_type == 0x0008)
+    {
+      GET_HEADER (ip, struct iphdr, pck, offset);
+
+      if (ip->protocol == 1)
+	{
+	  ip->ihl = 5;
+	  ip->version = 4;
+	  ip->tos = 0;
+	  ip->tot_len = 0x0000;
+	  ip->id = 0;
+	  ip->frag_off = 0;
+	  ip->ttl = 0x40;
+	  ip->protocol = 1;
+	  ip->check = 0x0000;
+	  ip->daddr = ip->saddr;
+	  ((uint8_t *) &ip->saddr)[0] = ip_addr[0];
+	  ((uint8_t *) &ip->saddr)[1] = ip_addr[1];
+	  ((uint8_t *) &ip->saddr)[2] = ip_addr[2];
+	  ((uint8_t *) &ip->saddr)[3] = ip_addr[3];
+
+	  GET_HEADER (icmp, struct icmphdr, pck, offset);
+
+	  icmp->type = 0x00;
+	  icmp->code = 0;
+	  icmp->checksum = cksum (icmp, sizeof (struct icmphdr));
+
+	  /* rest is payload */
+	  offset = *size;
+
+	  ip->tot_len = __bswap_16 (offset - sizeof (struct ether_header));
+	  ip->check = cksum (ip, sizeof (struct iphdr));
+	}
+    }
+
+  offset += encap_size;
+
+  assert (offset != *size &&
+	  "new packet length must be increased by encap size");
+
+  /* overwrite packet size */
+  *size = offset;
+
+  return 0;
+}