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The current standard (RFC 3542) is for IPV6_RECVPKTINFO to be given to setsockopt, and IPV6_PKTINFO to be used as the packet type. Previously, RFC 2292 required IPV6_PKTINFO to be used for both, but RFC 3542 re-purposed IPV6_PKTINFO when given to setsockopt. The special Linux-specific IPV6_2292PKTINFO has the same semantics as IPV6_PKTINFO in RFC 2292, but was introduced at the same time as IPV6_RECVPKTINFO. Therefore, if we have IPV6_RECVPKTINFO available, we can use the RFC 3542 style, and if not, we assume that only the RFC 2292 API is available, using IPV6_PKTINFO for both. Signed-off-by: James Clarke <jrtc27@jrtc27.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Please see the LICENSE file for copyright information (GPLv2) libbb is BusyBox's utility library. All of this stuff used to be stuffed into a single file named utility.c. When I split utility.c to create libbb, some of the very oldest stuff ended up without their original copyright and licensing information (which is now lost in the mists of time). If you see something that you wrote that is mis-attributed, do let me know so we can fix that up. Erik Andersen <andersen@codepoet.org>