kTLS: implement sendmsg #4147
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kTLS: implement sendmsg #4147
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This was referenced Aug 15, 2023
lrstewart
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tls/s2n_ktls_io.c
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| RESULT_ENSURE(msg_iov->iov_base, S2N_ERR_INVALID_ARGUMENT); |
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Why is this check necessary?
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We are creating a msghdr using iovec and there is an assumption that iovec is not malformed. This check confirms that assumption. If iovec is NULL then msghdr is also malformed.
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Would the iovec be considered malformed if iov_base is NULL and iov_len is 0?
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ill check and ban both NULL and 0.. that seems safer for now and we can support sending 0 later if we need
changed my mind. I'll allow both since we should be able to send 0 data and thats valid.
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lrstewart
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Description of changes:
This PR adds an implementation for s2n_ktls_sendmsg. This essentially takes some data and some record_type and calls the
sendmsgsyscall. It creates amsghdrand configures the control data on it. Finally it is also doing some error handling (mainly IO blocked error).Call-outs:
Testing:
Unit tests
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.