Ulp.txt Jun 2026

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“The ULP kernel infrastructure provides a means to hook upper layer protocol support on a socket. A module may register a ULP hook in the kernel. ULP processing is enabled by a setsockopt on a socket that specifies the name of the registered ULP to invoke. An initialization function is defined for each ULP that can change the function entry points of the socket (sendmsg, rcvmsg, etc.) or change the socket in other fundamental ways.” ULP.txt