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net/eth: sized-eth-frame class for creating frames

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This commit is contained in:
Martin Stein 2016-08-25 17:40:45 +02:00 committed by Christian Helmuth
parent 47bc5c9a8d
commit b50fe705d9
1 changed files with 36 additions and 1 deletions
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37
repos/os/include/net/ethernet.h
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@ -21,7 +21,13 @@
#include <util/endian.h>
#include <net/mac_address.h>
namespace Net { class Ethernet_frame; }
namespace Net
{
class Ethernet_frame;
template <Genode::size_t DATA_SIZE>
class Ethernet_frame_sized;
}
/**
@ -57,6 +63,7 @@ class Net::Ethernet_frame
class No_ethernet_frame : Genode::Exception {};
enum { MIN_SIZE = 64 };
/**
* Id representing encapsulated protocol.
@ -178,4 +185,32 @@ class Net::Ethernet_frame
} __attribute__((packed));
template <Genode::size_t DATA_SIZE>
class Net::Ethernet_frame_sized : public Ethernet_frame
{
private:
enum {
HS = sizeof(Ethernet_frame),
DS = DATA_SIZE + HS >= MIN_SIZE ? DATA_SIZE : MIN_SIZE - HS,
};
Genode::uint8_t _data[DS];
Genode::uint32_t _checksum;
public:
Ethernet_frame_sized(Mac_address dst_in, Mac_address src_in,
Ether_type type_in)
:
Ethernet_frame(sizeof(Ethernet_frame))
{
dst(dst_in);
src(src_in);
type(type_in);
}
} __attribute__((packed));
#endif /* _NET__ETHERNET_H_ */