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processes in jail could create raw sockets, additional access control checks were added to raw IP sockets to limit the ways in which those sockets could be used. Specifically, only the socket option IP_HDRINCL was permitted in rip_ctloutput(). Other socket options were protected by a call to suser(). This change was required to prevent processes in a Jail from modifying system properties such as multicast routing and firewall rule sets. However, it also introduced a regression: processes that create a raw socket with root privilege, but then downgraded credential (i.e., a daemon giving up root, or a setuid process switching back to the real uid) could no longer issue other unprivileged generic IP socket option operations, such as IP_TOS, IP_TTL, and the multicast group membership options, which prevented multicast routing daemons (and some other tools) from operating correctly. This change pushes the access control decision down to the granularity of individual socket options, rather than all socket options, on raw IP sockets. When rip_ctloutput() doesn't implement an option, it will now pass the request directly to in_control() without an access control check. This should restore the functionality of the generic IP socket options for raw sockets in the above-described scenarios, which may be confirmed with the ipsockopt regression test. RELENG_5 candidate. Reviewed by: csjp
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