void IPv4Handler::sendICMPTimeExceeded(VlanID srcVlan,
MacAddress dst,
MacAddress src,
IPv4Hdr& v4Hdr,
Cursor cursor) {
auto state = sw_->getState();
// payload serialization function
// 4 bytes unused + ipv4 header + 8 bytes payload
auto bodyLength = ICMPHdr::ICMPV4_UNUSED_LEN + v4Hdr.size()
+ ICMPHdr::ICMPV4_SENDER_BYTES;
auto serializeBody = [&](RWPrivateCursor* sendCursor) {
sendCursor->writeBE<uint32_t>(0); // unused bytes
v4Hdr.write(sendCursor);
sendCursor->push(cursor.data(), ICMPHdr::ICMPV4_SENDER_BYTES);
};
IPAddressV4 srcIp = getSwitchVlanIP(state, srcVlan);
auto icmpPkt = createICMPv4Pkt(sw_, dst, src, srcVlan,
v4Hdr.srcAddr, srcIp,
ICMPV4_TYPE_TIME_EXCEEDED,
ICMPV4_CODE_TIME_EXCEEDED_TTL_EXCEEDED,
bodyLength, serializeBody);
VLOG(4) << "sending ICMP Time Exceeded with srcMac " << src
<< " dstMac: " << dst
<< " vlan: " << srcVlan
<< " dstIp: " << v4Hdr.srcAddr.str()
<< " srcIp: " << srcIp.str()
<< " bodyLength: " << bodyLength;
sw_->sendPacketSwitched(std::move(icmpPkt));
}
// public
bool IPAddressV4::inSubnetWithMask(const IPAddressV4& subnet,
const ByteArray4 cidrMask) const {
const ByteArray4 mask = detail::Bytes::mask(toByteArray(), cidrMask);
const ByteArray4 subMask = detail::Bytes::mask(subnet.toByteArray(),
cidrMask);
return (mask == subMask);
}
void toAppend(IPAddressV4 addr, fbstring* result) {
result->append(addr.str());
}
// free functions
size_t hash_value(const IPAddressV4& addr) {
return addr.hash();
}
