從udpl4傳下來之後
void
ipv4l3protocol::send (ptr packet,
ipv4address source,
ipv4address destination,
uint8_t protocol,
ptr route)
uint8_t tos =0;
//讀取packettag中的tos優先順序
socketiptostag iptostag;
found = packet-
>removepackettag (iptostag);if
(found)
// handle a few cases:
// 1) packet is destined to limited broadcast address
// 2) packet is destined to a subnet-directed broadcast address
// 3) packet is not broadcast, and is passed in with a route entry
// 4) packet is not broadcast, and is passed in with a route entry but route->getgateway is not set (e.g., on-demand)
// 5) packet is not broadcast, and route is null (e.g., a raw socket call, or icmp)
//一般為3或者5
// 1) packet is destined to limited broadcast address or link-local multicast address
if(destination.isbroadcast (
)|| destination.islocalmulticast ())
for(
uint32_t index =
0; index < outinte***ce-
>getnaddresses (
); index++)}
if(sendit)
}return;}
// 2) check: packet is destined to a subnet-directed broadcast address
uint32_t ifaceindex =0;
for(ipv4inte***celist::iterator ifaceiter = m_inte***ces.begin ();
ifaceiter != m_inte***ces.end (
); ifaceiter++
, ifaceindex++)}
}// 3) packet is not broadcast, and is passed in with a route entry
// with a valid ipv4address as the gateway
if(route && route-
>getgateway (
)!= ipv4address ())
// 4) packet is not broadcast, and is passed in with a route entry but route->getgateway is not set (e.g., on-demand)
if(route && route-
>getgateway (
)== ipv4address ())
// 5) packet is not broadcast, and route is null (e.g., a raw socket call)
ns_log_logic (
"ipv4l3protocol::send case 5: passed in with no route "
<< destination)
; socket::socketerrno errno_;
ptr oif (0)
;// unused for now
ipheader = buildheader (source, destination, protocol, packet-
>getsize (
), ttl, tos, mayfragment)
; ptr newroute;
if(m_routingprotocol !=0)
else
if(newroute)
else
}
void
ipv4l3protocol::sendrealout (ptr route,
ptr packet,
ipv4header const
&ipheader)
//從route中讀取藉口（inte***ce）
ptr outdev = route-
>getoutputdevice ();
int32_t inte***ce = getinte***cefordevice (outdev)
; ns_assert (inte***ce >=0)
; ptr outinte***ce = getinte***ce (inte***ce)
; ns_log_logic (
"send via netdevice ifindex "
<< outdev-
>getifindex (
)<<
" ipv4inte***ceindex "
<< inte***ce);if
(!route-
>getgateway (
).isequal (ipv4address (
"0.0.0.0"))
)//判斷目的ip是都在本子網內，不在的話發給閘道器
}else
}else
}else
//若再本子網內，直接發給目的主機
}else
}else
}}
void
ipv4inte***ce::send (ptr p,
const ipv4header & hdr, ipv4address dest)
// check for a loopback device, if it's the case we don't pass through
// traffic control layer
if(dynamiccast
(m_device))
ns_assert (m_tc !=0)
;// is this packet aimed at a local inte***ce ?
for(ipv4inte***ceaddresslistci i = m_ifaddrs.begin (
); i != m_ifaddrs.end ();
++i)}if
(m_device-
>needsarp ())
else
if(dest.ismulticast ())
else}if
(!found)}if
(found)
}else
}
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