1 files changed, 130 insertions, 0 deletions
diff --git a/mpm/python/usrp_mpm/sys_utils/net.py b/mpm/python/usrp_mpm/sys_utils/net.py
new file mode 100644
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+++ b/mpm/python/usrp_mpm/sys_utils/net.py
@@ -0,0 +1,130 @@
+
+# Copyright 2017 Ettus Research (National Instruments)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+"""
+N310 implementation module
+"""
+import itertools
+import socket
+from six import iteritems
+from pyroute2 import IPRoute
+from usrp_mpm.mpmlog import get_logger
+
+
+def get_valid_interfaces(iface_list):
+    """
+    Given a list of interfaces (['eth1', 'eth2'] for example), return the
+    subset that contains actually valid entries.
+    Interfaces are checked for if they actually exist, and if so, if they're up.
+    """
+    valid_ifaces = []
+    with IPRoute() as ipr:
+        for iface in iface_list:
+            valid_iface_idx = ipr.link_lookup(ifname=iface)
+            if len(valid_iface_idx) == 0:
+                continue
+            valid_iface_idx = valid_iface_idx[0]
+            link_info = ipr.get_links(valid_iface_idx)[0]
+            if link_info.get_attr('IFLA_OPERSTATE') == 'UP' \
+                    and len(get_iface_addrs(link_info.get_attr('IFLA_ADDRESS'))):
+                assert link_info.get_attr('IFLA_IFNAME') == iface
+                valid_ifaces.append(iface)
+    return valid_ifaces
+
+
+def get_iface_info(ifname):
+    """
+    Given an interface name (e.g. 'eth1'), return a dictionary with the
+    following keys:
+    - ip_addr: Main IPv4 address
+    - ip_addrs: List of valid IPv4 addresses
+    - mac_addr: MAC address
+
+    All values are stored as strings.
+    """
+    try:
+        with IPRoute() as ipr:
+            links = ipr.link_lookup(ifname=ifname)
+            if len(links) == 0:
+                raise LookupError("No interfaces known with name `{}'!"
+                                  .format(ifname))
+            link_info = ipr.get_links(links)[0]
+    except IndexError:
+        raise LookupError("Could not get links for interface `{}'"
+                          .format(ifname))
+    mac_addr = link_info.get_attr('IFLA_ADDRESS')
+    ip_addrs = get_iface_addrs(mac_addr)
+    return {
+        'mac_addr': mac_addr,
+        'ip_addr': ip_addrs[0],
+        'ip_addrs': ip_addrs,
+    }
+
+def ip_addr_to_iface(ip_addr, iface_list):
+    """
+    Return an Ethernet interface (e.g. 'eth1') given an IP address.
+
+    Arguments:
+    ip_addr -- The IP address as a string
+    iface_list -- A map "interface name" -> iface_info, where iface_info
+                  is another map as returned by net.get_iface_info().
+    """
+    # Flip around the iface_info map and then use it to look up by IP addr
+    return {
+        iface_info['ip_addr']: iface_name
+        for iface_name, iface_info in iteritems(iface_list)
+    }[ip_addr]
+
+
+def get_iface_addrs(mac_addr):
+    """
+    return ipv4 addresses for a given macaddress
+    input format: "aa:bb:cc:dd:ee:ff"
+    """
+    with  IPRoute() as ip2:
+        # returns index
+        [link] = ip2.link_lookup(address=mac_addr)
+        # Only get v4 addresses
+        addresses = [addr.get_attrs('IFA_ADDRESS')
+                     for addr in ip2.get_addr(family=socket.AF_INET)
+                     if addr.get('index', None) == link]
+        # flatten possibly nested list
+        addresses = list(itertools.chain.from_iterable(addresses))
+
+        return addresses
+
+
+def byte_to_mac(byte_str):
+    """
+    converts a bytestring into nice hex representation
+    """
+    return ':'.join(["%02x" % ord(x) for x in byte_str])
+
+
+def get_mac_addr(remote_addr):
+    """
+    return MAC address of a remote host already discovered
+    or None if no host entry was found
+    """
+    with IPRoute() as ip2:
+        addrs = ip2.get_neighbours(dst=remote_addr)
+        if len(addrs) > 1:
+            get_logger('get_mac_addr').warning("More than one device with the "
+                                               "same IP address found. "
+                                               "Picking entry at random")
+        if not addrs:
+            return None
+        return addrs[0].get_attr('NDA_LLADDR')