From bac3da61644515f05663789b122554dc77549286 Mon Sep 17 00:00:00 2001
From: Luca Muscariello <lumuscar+fdio@cisco.com>
Date: Thu, 17 Jan 2019 13:47:57 +0100
Subject: This is the first commit of the hicn project

Change-Id: I6f2544ad9b9f8891c88cc4bcce3cf19bd3cc863f
Signed-off-by: Luca Muscariello <lumuscar+fdio@cisco.com>
---
 hicn-light/src/platforms/linux/system.c | 184 ++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100755 hicn-light/src/platforms/linux/system.c

(limited to 'hicn-light/src/platforms/linux/system.c')

diff --git a/hicn-light/src/platforms/linux/system.c b/hicn-light/src/platforms/linux/system.c
new file mode 100755
index 000000000..fcf13becc
--- /dev/null
+++ b/hicn-light/src/platforms/linux/system.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 2017-2019 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 <errno.h>
+#include <ifaddrs.h>
+#include <src/config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+//#define __USE_MISC
+#include <net/if.h>
+
+// to get the list of arp types
+#include <net/if_arp.h>
+
+// for the mac address
+#include <netpacket/packet.h>
+
+#include <src/core/forwarder.h>
+#include <src/utils/interfaceSet.h>
+
+#include <parc/assert/parc_Assert.h>
+
+#include <src/utils/addressList.h>
+
+/**
+ * Returns the MTU for a named interface
+ *
+ * On linux, we get the MTU by opening a socket and reading SIOCGIFMTU
+ *
+ * @param [in] ifname Interface name (e.g. "eth0")
+ *
+ * @retval number The MTU in bytes
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+static int getMtu(const char *ifname) {
+  struct ifreq ifr;
+  int fd;
+
+  fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
+
+  strcpy(ifr.ifr_name, ifname);
+  ioctl(fd, SIOCGIFMTU, &ifr);
+
+  close(fd);
+  return ifr.ifr_mtu;
+}
+
+InterfaceSet *system_Interfaces(Forwarder *forwarder) {
+  InterfaceSet *set = interfaceSetCreate();
+
+  Logger *logger = forwarder_GetLogger(forwarder);
+
+  // this is the dynamically allocated head of the list
+  struct ifaddrs *ifaddr;
+  int failure = getifaddrs(&ifaddr);
+  parcAssertFalse(failure, "Error getifaddrs: (%d) %s", errno, strerror(errno));
+
+  struct ifaddrs *next;
+  for (next = ifaddr; next != NULL; next = next->ifa_next) {
+    if ((next->ifa_addr == NULL) || ((next->ifa_flags & IFF_UP) == 0)) {
+      continue;
+    }
+
+    Interface *iface = interfaceSetGetByName(set, next->ifa_name);
+    if (iface == NULL) {
+      unsigned mtu = (unsigned)getMtu(next->ifa_name);
+
+      iface = interfaceCreate(
+          next->ifa_name, forwarder_GetNextConnectionId(forwarder),
+          next->ifa_flags & IFF_LOOPBACK, next->ifa_flags & IFF_MULTICAST, mtu);
+
+      interfaceSetAdd(set, iface);
+    }
+
+    int family = next->ifa_addr->sa_family;
+    switch (family) {
+      case AF_INET: {
+        Address *address =
+            addressCreateFromInet((struct sockaddr_in *)next->ifa_addr);
+        interfaceAddAddress(iface, address);
+        break;
+      }
+
+      case AF_INET6: {
+        Address *address =
+            addressCreateFromInet6((struct sockaddr_in6 *)next->ifa_addr);
+        interfaceAddAddress(iface, address);
+        break;
+      }
+
+      case AF_PACKET: {
+        struct sockaddr_ll *addr_ll = (struct sockaddr_ll *)next->ifa_addr;
+
+        if (logger_IsLoggable(logger, LoggerFacility_IO, PARCLogLevel_Debug)) {
+          logger_Log(logger, LoggerFacility_IO, PARCLogLevel_Debug, __func__,
+                     "sockaddr_ll family %d proto %d ifindex %d hatype %d "
+                     "pkttype %d halen %d",
+                     addr_ll->sll_family, addr_ll->sll_protocol,
+                     addr_ll->sll_ifindex, addr_ll->sll_hatype,
+                     addr_ll->sll_pkttype, addr_ll->sll_halen);
+        }
+
+        switch (addr_ll->sll_hatype) {
+          // list of the ARP hatypes we can extract a MAC address from
+          case ARPHRD_ETHER:
+          // fallthrough
+          case ARPHRD_IEEE802: {
+            Address *address = addressCreateFromLink(
+                (uint8_t *)addr_ll->sll_addr, addr_ll->sll_halen);
+            interfaceAddAddress(iface, address);
+            break;
+          }
+          default:
+            break;
+        }
+
+        break;
+      }
+    }
+  }
+
+  freeifaddrs(ifaddr);
+  return set;
+}
+
+Address *system_GetMacAddressByName(Forwarder *forwarder,
+                                    const char *interfaceName) {
+  Address *linkAddress = NULL;
+
+  InterfaceSet *interfaceSet = system_Interfaces(forwarder);
+  Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);
+
+  if (interface) {
+    const AddressList *addressList = interfaceGetAddresses(interface);
+
+    size_t length = addressListLength(addressList);
+    for (size_t i = 0; i < length && !linkAddress; i++) {
+      const Address *a = addressListGetItem(addressList, i);
+      if (addressGetType(a) == ADDR_LINK) {
+        linkAddress = addressCopy(a);
+      }
+    }
+  }
+
+  interfaceSetDestroy(&interfaceSet);
+
+  return linkAddress;
+}
+
+unsigned system_InterfaceMtu(Forwarder *forwarder, const char *interfaceName) {
+  unsigned mtu = 0;
+
+  InterfaceSet *interfaceSet = system_Interfaces(forwarder);
+  Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);
+
+  if (interface) {
+    mtu = interfaceGetMTU(interface);
+  }
+
+  interfaceSetDestroy(&interfaceSet);
+
+  return mtu;
+}
-- 
cgit 1.2.3-korg