The net.inet6.* sysctl's that lack a description are as follows:

net.inet6.ip6.forwarding:

net.inet6.ip6.redirect:
net.inet6.ip6.hlim:
net.inet6.ip6.stats:
net.inet6.ip6.maxfragpackets:
net.inet6.ip6.accept_rtadv:
net.inet6.ip6.keepfaith:
net.inet6.ip6.log_interval:
net.inet6.ip6.hdrnestlimit:
net.inet6.ip6.dad_count:
net.inet6.ip6.auto_flowlabel:
net.inet6.ip6.defmcasthlim:
net.inet6.ip6.gifhlim:
net.inet6.ip6.kame_version:
net.inet6.ip6.use_deprecated:
net.inet6.ip6.rr_prune:
net.inet6.ip6.v6only:
net.inet6.ip6.rtexpire:
net.inet6.ip6.rtminexpire:
net.inet6.ip6.rtmaxcache:
net.inet6.ip6.use_tempaddr:
net.inet6.ip6.temppltime:
net.inet6.ip6.tempvltime:
net.inet6.ip6.auto_linklocal:
net.inet6.ip6.rip6stats:
net.inet6.ip6.addrctlpolicy:
net.inet6.icmp6.stats:
net.inet6.icmp6.rediraccept:
net.inet6.icmp6.redirtimeout:
net.inet6.icmp6.nd6_prune:
net.inet6.icmp6.nd6_delay:
net.inet6.icmp6.nd6_umaxtries:
net.inet6.icmp6.nd6_mmaxtries:
net.inet6.icmp6.nd6_useloopback:
net.inet6.icmp6.nodeinfo:
net.inet6.icmp6.errppslimit:
net.inet6.icmp6.nd6_maxnudhint:
net.inet6.icmp6.nd6_debug:
net.inet6.icmp6.nd6_drlist:
net.inet6.icmp6.nd6_prlist:

Research these sysctl's in the kernel code and document each with a descriptive but concise sentence (approximately 3-15 words).

Deliverables: A description of each sysctl listed above.

Bonus deliverables: The above descriptions in the form of a kernel patch