feat: Add SEQPACKET socket type support for vsock

Open sumansaurabh opened this issue 3 months ago • 0 comments

Summary

Implements SEQPACKET socket type support for virtio vsock to enable datagram relay use cases while preserving message boundaries.

Changes Made

Added VIRTIO_VSOCK_F_SEQPACKET feature flag support
Implemented SOCK_SEQPACKET socket type handling in vsock implementation
Added socket type validation to ensure host UDS matches vsock socket type
Enhanced connection logic to handle SEQPACKET connections appropriately

Why This Change

This addresses GitHub Issue #4822 by enabling VMs to relay datagrams over vsock while maintaining packet boundaries, which is not possible with SOCK_STREAM that combines messages together. This provides a more efficient solution than implementing custom packet boundaries within stream sockets.

Testing

Verified that:

SOCK_SEQPACKET connections can be established successfully
Socket type mismatches are properly rejected
Message boundaries are preserved in SEQPACKET mode

Fixes #4822

This PR was created from task: https://cloud.blackbox.ai/tasks/Nuype64zWauLUuobO0u01

Nov 08 '25 07:11 sumansaurabh