1 files changed, 106 insertions, 0 deletions
diff --git a/mpm/python/usrp_mpm/net.py b/mpm/python/usrp_mpm/net.py
new file mode 100644
index 000000000..29c1bcab9
--- /dev/null
+++ b/mpm/python/usrp_mpm/net.py
@@ -0,0 +1,106 @@
+
+# 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 pyroute2 import IPRoute
+from .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.
+    """
+    ipr = IPRoute()
+    valid_ifaces = []
+    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':
+            assert link_info.get_attr('IFLA_IFNAME') == iface
+            valid_ifaces.append(iface)
+    ipr.close()
+    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.
+    """
+    ipr = IPRoute()
+    try:
+        link_info = ipr.get_links(ipr.link_lookup(ifname=ifname))[0]
+    except IndexError:
+        raise LookupError("Could not identify 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 get_iface_addrs(mac_addr):
+    """
+    return ipv4 addresses for a given macaddress
+    input format: "aa:bb:cc:dd:ee:ff"
+    """
+    ip2 = IPRoute()
+    # 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))
+    ip2.close()
+    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
+    """
+    ip2 = IPRoute()
+    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')