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data records. The kernel RPC cannot process non-application data records when using TLS. It must to an upcall to a userspace daemon that will call SSL_read() to process them. This patch adds a new flag called MSG_TLSAPPDATA that the kernel RPC can use to tell sorecieve() to return ENXIO instead of a non-application data record, when that is what is at the top of the receive queue. I put the code in #ifdef KERN_TLS/#endif, although it will build without that, so that it is recognized as only useful when KERN_TLS is enabled. The alternative to doing this is to have the kernel RPC re-queue the non-application data message after receiving it, but that seems more complicated and might introduce message ordering issues when there are multiple non-application data records one after another. I do not know what, if any, changes will be required to support TLS1.3. Reviewed by: glebius Differential Revision: https://reviews.freebsd.org/D25923
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