[ns] where is the "hdr_flags" constructed?

[=?gb2312?B?wrO1wsC0?=]

hi all,
 
I saw the  
 
 hdr_flags* hf = hdr_flags::access(p); hf->ecn_capable_ = 0; hf->ecn_ = 0; hf->eln_ = 0; hf->ecn_to_echo_ = 0; hf->fs_ = 0; hf->no_ts_ = 0; hf->pri_ = 0; hf->cong_action_ = 0; hf->qs_ = 0;
 
in the Agent::initpkt(Packet* p) const
 
but I can not find the hdr_flags definition in ns2? could anyone told me which file it is in ? thanks alot
 
Delai
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