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Add support for relay DHCP

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Use the relay DHCP agent information as basis for
subnet comparison instead of self, when present.

Use the candidate prefix length verbatim since the
relay will offer no hint as to the 'proper' prefix
length for the target segment.
This commit is contained in:
Jarrod Johnson 2024-08-22 10:20:04 -04:00
parent 9cf199a53e
commit 82be3c91d5
2 changed files with 11 additions and 4 deletions
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3
confluent_server/confluent/discovery/protocols/pxe.py
View File

@ -728,9 +728,10 @@ def reply_dhcp4(node, info, packet, cfg, reqview, httpboot, cfd, profile):
repview[1:10] = reqview[1:10] # duplicate txid, hwlen, and others
repview[10:11] = b'\x80' # always set broadcast
repview[28:44] = reqview[28:44] # copy chaddr field
relayip = reqview[24:28].tobytes()
gateway = None
netmask = None
niccfg = netutil.get_nic_config(cfg, node, ifidx=info['netinfo']['ifidx'])
niccfg = netutil.get_nic_config(cfg, node, ifidx=info['netinfo']['ifidx'], relayip=relayip)
nicerr = niccfg.get('error_msg', False)
if nicerr:
log.log({'error': nicerr})

12
confluent_server/confluent/netutil.py
View File

@ -408,7 +408,7 @@ def noneify(cfgdata):
# the ip as reported by recvmsg to match the subnet of that net.* interface
# if switch and port available, that should match.
def get_nic_config(configmanager, node, ip=None, mac=None, ifidx=None,
serverip=None):
serverip=None, relayipn=b'\x00\x00\x00\x00'):
"""Fetch network configuration parameters for a nic
For a given node and interface, find and retrieve the pertinent network
@ -489,6 +489,10 @@ def get_nic_config(configmanager, node, ip=None, mac=None, ifidx=None,
bestsrvbyfam = {}
for myaddr in myaddrs:
fam, svrip, prefix = myaddr[:3]
if fam == socket.AF_INET and relayipn != b'\x00\x00\x00\x00':
bootsvrip = relayipn
else:
bootsvrip = svrip
candsrvs.append((fam, svrip, prefix))
if fam == socket.AF_INET:
nver = '4'
@ -508,6 +512,8 @@ def get_nic_config(configmanager, node, ip=None, mac=None, ifidx=None,
candip = cfgbyname[candidate].get('ipv{}_address'.format(nver), None)
if candip and '/' in candip:
candip, candprefix = candip.split('/')
if fam == socket.AF_INET and relayipn != b'\x00\x00\x00\x00':
prefix = int(candprefix)
if int(candprefix) != prefix:
continue
candgw = cfgbyname[candidate].get('ipv{}_gateway'.format(nver), None)
@ -515,7 +521,7 @@ def get_nic_config(configmanager, node, ip=None, mac=None, ifidx=None,
try:
for inf in socket.getaddrinfo(candip, 0, fam, socket.SOCK_STREAM):
candipn = socket.inet_pton(fam, inf[-1][0])
if ipn_on_same_subnet(fam, svrip, candipn, prefix):
if ipn_on_same_subnet(fam, bootsvrip, candipn, prefix):
bestsrvbyfam[fam] = svrip
cfgdata['ipv{}_address'.format(nver)] = candip
cfgdata['ipv{}_method'.format(nver)] = ipmethod
@ -533,7 +539,7 @@ def get_nic_config(configmanager, node, ip=None, mac=None, ifidx=None,
elif candgw:
for inf in socket.getaddrinfo(candgw, 0, fam, socket.SOCK_STREAM):
candgwn = socket.inet_pton(fam, inf[-1][0])
if ipn_on_same_subnet(fam, svrip, candgwn, prefix):
if ipn_on_same_subnet(fam, bootsvrip, candgwn, prefix):
candgws.append((fam, candgwn, prefix))
if foundaddr:
return noneify(cfgdata)