Commit fd48747a authored by Tomek Mrugalski's avatar Tomek Mrugalski 🛰

[3546] MAC_SOURCE_* values are now a bitmask

parent 003c8279
......@@ -20,7 +20,7 @@ namespace dhcp {
void
Pkt::addOption(const OptionPtr& opt) {
options_.insert(std::pair<int, boost::shared_ptr<Option> >(opt->getType(), opt));
options_.insert(std::pair<int, OptionPtr>(opt->getType(), opt));
}
OptionPtr
......@@ -29,7 +29,7 @@ Pkt::getOption(uint16_t type) const {
if (x != options_.end()) {
return (*x).second;
}
return boost::shared_ptr<isc::dhcp::Option>(); // NULL
return (OptionPtr()); // NULL
}
bool
......@@ -60,7 +60,9 @@ Pkt::updateTimestamp() {
}
void Pkt::repack() {
buffer_out_.writeData(&data_[0], data_.size());
if (!data_.empty()) {
buffer_out_.writeData(&data_[0], data_.size());
}
}
void
......@@ -87,18 +89,21 @@ Pkt::setHWAddrMember(const uint8_t htype, const uint8_t,
}
HWAddrPtr
Pkt::getMAC(MACSource from) {
Pkt::getMAC(uint32_t hw_addr_src) {
HWAddrPtr mac;
if (from == MAC_SOURCE_RAW || from == MAC_SOURCE_ANY) {
if (hw_addr_src & MAC_SOURCE_RAW) {
mac = getRemoteHWAddr();
if (mac) {
return (mac);
} else if (hw_addr_src == MAC_SOURCE_RAW) {
// If we're interested only in RAW sockets, no bother trying
// other options.
return (HWAddrPtr());
}
}
/// @todo: add other MAC acquisition methods here
// Ok, none of the methods were suitable. Return NULL.
return (HWAddrPtr());
}
......
......@@ -36,46 +36,50 @@ namespace dhcp {
class Pkt {
public:
/// @brief specified where did we get this MAC address from?
/// @defgroup Specifies where a given MAC address was obtained
///
/// The list covers all possible MAC sources. The uncommented ones
/// are currently supported. When you implement a new method, please
/// uncomment appropriate line here.
enum MACSource {
/// @brief The list covers all possible MAC sources.
///
/// @note The uncommented ones are currently supported. When you implement
/// a new method, please uncomment appropriate line here.
///
/// @{
/// Not really a type, only used in getMAC() calls
MAC_SOURCE_ANY,
/// Not really a type, only used in getMAC() calls
static const uint32_t MAC_SOURCE_ANY = 0xffff;
/// obtained first hand from raw socket (100% reliable)
MAC_SOURCE_RAW,
/// obtained first hand from raw socket (100% reliable)
static const uint32_t MAC_SOURCE_RAW = 0x0001;
/// extracted from DUID-LL or DUID-LLT (not reliable as the client
/// can send fake DUID)
// MAC_SOURCE_DUID,
/// extracted from DUID-LL or DUID-LLT (not reliable as the client
/// can send fake DUID)
static const uint32_t MAC_SOURCE_DUID = 0x0002;
/// extracted from IPv6 link-local address. Client can use different
/// IID other than EUI-64, e.g. Windows supports RFC4941 and uses
/// random values instead of EUI-64.
// MAC_SOURCE_IPV6_LINK_LOCAL,
/// extracted from IPv6 link-local address. Client can use different
/// IID other than EUI-64, e.g. Windows supports RFC4941 and uses
/// random values instead of EUI-64.
static const uint32_t MAC_SOURCE_IPV6_LINK_LOCAL = 0x0004;
/// RFC6939 (a relay agent can insert client link layer address option)
/// Note that a skilled attacker can fake that by sending his request
/// relayed, so the legitimate relay will think it's a second relay.
// MAC_SOURCE_CLIENT_ADDR_RELAY_OPTION,
/// RFC6939 (a relay agent can insert client link layer address option)
/// Note that a skilled attacker can fake that by sending his request
/// relayed, so the legitimate relay will think it's a second relay.
static const uint32_t MAC_SOURCE_CLIENT_ADDR_RELAY_OPTION = 0x0008;
/// A relay can insert remote-id. In some deployments it contains a MAC
/// address.
// MAC_SOURCE_REMOTE_ID,
/// A relay can insert remote-id. In some deployments it contains a MAC
/// address.
static const uint32_t MAC_SOURCE_REMOTE_ID = 0x0010;
/// A relay can insert a subscriber-id option. In some deployments it
/// contains a MAC address.
// MAC_SOURCE_SUBSCRIBER_ID,
/// A relay can insert a subscriber-id option. In some deployments it
/// contains a MAC address.
static const uint32_t MAC_SOURCE_SUBSCRIBER_ID = 0x0020;
/// A CMTS (acting as DHCP relay agent) that supports DOCSIS standard
/// can insert DOCSIS options that contain client's MAC address.
/// Client in this context would be a cable modem.
static const uint32_t MAC_SOURCE_DOCSIS_OPTIONS = 0x0040;
/// @}
/// A CMTS (acting as DHCP relay agent) that supports DOCSIS standard
/// can insert DOCSIS options that contain client's MAC address.
/// Client in this context would be a cable modem.
// MAC_SOURCE_DOCSIS_OPTIONS
};
protected:
Pkt(uint32_t transid, const isc::asiolink::IOAddress& local_addr,
......@@ -418,6 +422,12 @@ public:
///
/// @note mac_addr must be a buffer of at least hlen bytes.
///
/// In a typical case, hlen field would be redundant, as it could
/// be extracted from mac_addr.size(). However, the difference is
/// when running on exotic hardware, like Infiniband, that had
/// MAC addresses 20 bytes long. In that case, hlen is set to zero
/// in DHCPv4.
///
/// @param htype hardware type (will be sent in htype field)
/// @param hlen hardware length (will be sent in hlen field)
/// @param mac_addr pointer to hardware address
......@@ -438,7 +448,12 @@ public:
/// This method is more generic and can attempt to obtain MAC from
/// varied sources: raw sockets, client-id, link-local IPv6 address,
/// and various relay options.
HWAddrPtr getMAC(MACSource from);
///
/// hw_addr_src takes a combination of bit values specified in
/// MAC_SOURCE_* constants.
///
/// @param hw_addr_src a bitmask that specifies hardware address source
HWAddrPtr getMAC(uint32_t hw_addr_src);
/// @brief virtual desctructor
///
......
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