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BSDCon '03 — Abstract
Pp. 125-132 of the Proceedings
Tagging Data in the Network Stack: mbuf_tags
Angelos D. Keromytis, Columbia University
Abstract
We describe the mbuf_tag API, a mechanism for tagging data as
they flow through the network stack. Originally introduced in OpenBSD,
mbuf_tags were initially intended for use by the IPsec
stack. The API has matured enough to be used by several other kernel
components, and formed the basis for the FreeBSD mbuf_tags. We
present the API, discuss its various uses in the OpenBSD network
stack, and describe some plans for future work. Our goal is to
demonstrate the flexibility of this relatively simple mechanism and
expose it to other kernel developers.
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