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Lorenzo Colitti
e964f2357c
When using mark-based routing, sockets returned from accept() may need to be marked differently depending on the incoming connection request. This is the case, for example, if different socket marks identify different networks: a listening socket may want to accept connections from all networks, but each connection should be marked with the network that the request came in on, so that subsequent packets are sent on the correct network. This patch adds a sysctl to mark TCP sockets based on the fwmark of the incoming SYN packet. If enabled, and an unmarked socket receives a SYN, then the SYN packet's fwmark is written to the connection's inet_request_sock, and later written back to the accepted socket when the connection is established. If the socket already has a nonzero mark, then the behaviour is the same as it is today, i.e., the listening socket's fwmark is used. Black-box tested using user-mode linux: - IPv4/IPv6 SYN+ACK, FIN, etc. packets are routed based on the mark of the incoming SYN packet. - The socket returned by accept() is marked with the mark of the incoming SYN packet. - Tested with syncookies=1 and syncookies=2. Change-Id: I5e8c9b989762a93f3eb5a0c1b4df44f62d57f3cb Signed-off-by: Lorenzo Colitti <lorenzo@google.com> [imaund@codeaurora.org: Resolve trivial merge conflicts.] Git-commit: 4593f09b1f9939ec6ed2f8d7848def26b98c47ac Git-repo: https://android.googlesource.com/kernel/common.git Signed-off-by: Ian Maund <imaund@codeaurora.org>