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Right now I’m writing a program that uses a raw TCP socket. If there are any incoming packets with bad TCP checksums, will the kernel pass them to the program or drop them? The reason I want to know is to figure out if I’ll need to manually do that check or not.
Since you are writing TCP youself (working with an “IP” Socket/Layer) will have to handle the TCP Checksums. Any layers below or any checksums, will be handled by the underlying OS.
With the TCP/IP Stack you have (bottom to top order)
Link
Internet <- Socket Here Anything here and below will be handled. Essentially you are saying I am writing my own Transport protocol and it happens to be TCP.
Transport <- TCP Here
Application