unix_net.h

#pragma once
 
#include <cx/net/net_private.h>
#include <cx/platform/unix.h>
#include <cx/buffer/buffer.h>
 
#include <limits.h>
#include <sys/socket.h>
#include <sys/uio.h>
 
bool netAddrToSockaddr(_In_ const NetAddr* addr, _Out_ struct sockaddr_storage* sa,
                       _Out_ int* sasz);
 
bool netAddrFromSockaddr(_Out_ NetAddr* addr, _In_ const struct sockaddr* sa);
 
// Enough room for the control messages one datagram carries in either direction, in either address
// family: a packet info structure and a traffic class byte. Buffers of this size sit on the stack
// of every ingest loop, so it is sized to what is actually used rather than generously -- a
// too-small buffer truncates a control message silently.
#define NET_CMSG_SPACE 128
 
// Reads the local address and ECN mark out of a received message's control data, and clears what
// was not there. Anything unrecognized is skipped: an option enabled by something else on the same
// socket must not stop the two that matter from being found.
void _netCmsgToPktInfo(_Inout_ struct msghdr* mh, _Out_ NetPktInfo* info);
 
typedef struct iovec NetPlatIov;
 
#if defined(NET_MAX_IOV)
#undef NET_MAX_IOV
#endif
#if defined(IOV_MAX) && IOV_MAX < 64
#define NET_MAX_IOV IOV_MAX
#else
#define NET_MAX_IOV 64
#endif
 
_meta_inline size_t netIovToPlatform(_Out_writes_(count) NetPlatIov* out,
                                     _In_reads_(count) const BufIov* iov, size_t count)
{
    for (size_t i = 0; i < count; ++i) {
        out[i].iov_base = iov[i].data;
        out[i].iov_len  = iov[i].len;
    }
    return count;
}