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genetlink: Build a generic netlink family module alias

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Generic netlink searches for -type- formatted aliases when requesting a module to
fulfill a protocol request (i.e. net-pf-16-proto-16-type-<x>, where x is a type
value).  However generic netlink protocols have no well defined type numbers,
they have string names.  Modify genl_ctrl_getfamily to request an alias in the
format net-pf-16-proto-16-family-<x> instead, where x is a generic string, and
add a macro that builds on the previously added MODULE_ALIAS_NET_PF_PROTO_NAME
macro to allow modules to specifify those generic strings.

Note, l2tp previously hacked together an net-pf-16-proto-16-type-l2tp alias
using the MODULE_ALIAS macro, with these updates we can convert that to use the
PROTO_NAME macro.

Signed-off-by: Neil Horman <[email protected]>
CC: Eric Dumazet <[email protected]>
CC: James Chapman <[email protected]>
CC: David Miller <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Neil Horman 2012-05-29 09:30:41 +00:00 • committed by David S. Miller
commit e9412c3708
3 changed files with 5 additions and 3 deletions
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3
net/l2tp/l2tp_netlink.c
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@ -923,5 +923,4 @@ MODULE_AUTHOR("James Chapman <[email protected]>");
MODULE_DESCRIPTION("L2TP netlink");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
__stringify(NETLINK_GENERIC) "-type-" "l2tp");
MODULE_ALIAS_GENL_FAMILY("l2tp");