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Explainer https://github.com/kkroo/multicast-in-direct-sockets Specification https://github.com/WICG/direct-sockets/pull/81 Summary Adds Source-Specific Multicast (SSM) support to the Direct Sockets API, allowing Isolated Web Apps to optionally specify a source address when joining multicast groups to receive UDP packets only from that source. The Direct Sockets API currently supports Any-Source Multicast (ASM), which receives packets from any source sending to the multicast group. SSM is essential to using multicast outside of private networks, simplifying packet routing, and filtering traffic at the network level by source address, preventing spoofing and denial of service attacks. Blink component Blink>Network->Direct Sockets Web Feature ID Missing feature Motivation RFC 8815 deprecates ASM for inter-domain use due to security vulnerabilities and operational complexity. Without SSM support, developers building multicast applications in Isolated Web Apps face several problems: Limited deployment scenarios: Applications are restricted to controlled private networks where all sources are trusted, preventing use cases like internet-wide content distribution or cross-organization IoT systems. Application-layer filtering overhead: Applications must receive and process all packets sent to a multicast group before validating the source, wasting CPU cycles and bandwidth on potentially malicious traffic. SSM is the standard approach for modern multicast deployments (RFC 4607) and is widely supported by enterprise networks and ISP infrastructure. Adding SSM support enables more secure multicast communication beyond private network boundaries. Initial public proposal https://github.com/WICG/direct-sockets/issues/80 Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/461262401 Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6208452397498368?gate=5129135169077248 This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/692dffe2.050a0220.17ec37.0673.GAE%40google.com.
