plugin: expose subflow error to plugins #331
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Add error parameter to subflow_closed callback to allow plugins to identify the reason for subflow closure, such as network errors. The error value corresponds to the MPTCP_ATTR_ERROR attribute from the kernel, which equals sk_err from struct sock. If the error attribute is not present in the netlink message, it defaults to 0. Fixes multipath-tcp#330
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matttbe
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Nov 28, 2025
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Thank you for having looked at that!
I just have two small suggestions if you don't mind.
- Add non-zero test value (110) for test_error_4 to verify different values - Enhance error parameter documentation to clarify it's an errno from sk_err - Update both public and private plugin headers with detailed description
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Thanks for the review, I've addressed both suggestions:
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matttbe
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Dec 1, 2025
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Thank you for the update! It looks good to me!
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Add error parameter to subflow_closed callback to allow plugins to identify the reason for subflow closure, such as network errors.
The error value corresponds to the
MPTCP_ATTR_ERRORattribute from the kernel, which equalssk_errfromstruct sock. If the error attribute is not present in the Netlink message, it defaults to 0.Fixes #330
Changes
mptcpd_plugin_ops.subflow_closedsignature to includeuint8_t errorparameter