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Datagram sockets such as UDP, ICMP, and fibre channel tend to provide a custom xfer_alloc_iob() handler to ensure that transmit I/O buffers contain sufficient headroom to accommodate any required protocol headers. Stream sockets such as TCP and TLS do not typically provide a custom xfer_alloc_iob() handler at present. The default handler simply calls alloc_iob(), and so stream socket consumers can therefore get away with using alloc_iob() rather than xfer_alloc_iob(). Fix the HTTP and ONC RPC protocols to use xfer_alloc_iob() where relevant, in order to operate correctly if the underlying stream socket chooses to provide a custom xfer_alloc_iob() handler. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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