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Description of problem:
Substantial part of kernel multicast/igmp interface is not documented in the relevant manpages (man 7 ip)[1]. It concerns the following socket options:

IP_MSFILTER
IP_ADD_SOURCE_MEMBERSHIP
IP_DROP_SOURCE_MEMBERSHIP
IP_BLOCK_SOURCE
IP_UNBLOCK_SOURCE
IP_MULTICAST_ALL
MCAST_MSFILTER
MCAST_JOIN_GROUP
MCAST_LEAVE_GROUP
MCAST_JOIN_SOURCE_GROUP
MCAST_LEAVE_SOURCE_GROUP
MCAST_BLOCK_SOURCE
MCAST_UNBLOCK_SOURCE

[1] http://www.kernel.org/doc/man-pages/online/pages/man7/ip.7.html

Version-Release number of selected component (if applicable):
Linux man-pages 3.22 (2009-02-28)

How reproducible:
always

Steps to Reproduce:
1. man 7 ip

Additional info:
Someone probably tried to document IP_MULTICAST_ALL[2].

[2] http://patchwork.ozlabs.org/patch/28902/

Socket options:

MCAST_MSFILTER
MCAST_JOIN_GROUP
MCAST_LEAVE_GROUP
MCAST_JOIN_SOURCE_GROUP
MCAST_LEAVE_SOURCE_GROUP
MCAST_BLOCK_SOURCE
MCAST_UNBLOCK_SOURCE

are not relevant for this bug, so they won't be documented in the ip(7) man page.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0447.html