ip_output.c question

[Zonghua Gu]

I noticed that the output functions of TCP and UDP call different IP layer
functions. 
udp_sendmsg calls ip_build_xmit (calls ip_build_xmit_slow to fragment the
msg) 
tcp_send_skb calls ip_queue_xmit (calls ip_fragment to fragment the msg)

Seems to me ip_build_xmit and ip_queue_xmit are doing the essentially the
same thing, so why two different functions?

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