mirror of
https://github.com/openssl/openssl.git
synced 2025-02-05 14:10:53 +08:00
cd715b7e7f
TLS device offload allows to perform zerocopy sendfile transmissions. FreeBSD provides this feature by default, and Linux 5.19 introduced it as an opt-in. Zerocopy improves the TX rate significantly, but has a side effect: if the underlying file is changed while being transmitted, and a TCP retransmission happens, the receiver may get a TLS record containing both new and old data, which leads to an authentication failure and termination of connection. This effect is the reason Linux makes a copy on sendfile by default. This commit adds support for TLS zerocopy sendfile on Linux disabled by default to avoid any unlikely backward compatibility issues on Linux, although sacrificing consistency in OpenSSL's behavior on Linux and FreeBSD. A new option called KTLSTxZerocopySendfile is added to enable the new zerocopy behavior on Linux. This option should be used when the the application guarantees that the file is not modified during transmission, or it doesn't care about breaking the connection. The related documentation is also added in this commit. The unit test added doesn't test the actual functionality (it would require specific hardware and a non-local peer), but solely checks that it's possible to set the new option flag. Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com> Reviewed-by: Tariq Toukan <tariqt@nvidia.com> Reviewed-by: Boris Pismenny <borisp@nvidia.com> Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Todd Short <todd.short@me.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/18650) |
||
|---|---|---|
| .. | ||
| methods | ||
| build.info | ||
| rec_layer_d1.c | ||
| rec_layer_s3.c | ||
| record_local.h | ||
| record.h | ||
| recordmethod.h | ||