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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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2
net/netlink/genetlink.c
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@ -836,7 +836,7 @@ static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
#ifdef CONFIG_MODULES
if (res == NULL) {
genl_unlock();
request_module("net-pf-%d-proto-%d-type-%s",
request_module("net-pf-%d-proto-%d-family-%s",
PF_NETLINK, NETLINK_GENERIC, name);
genl_lock();
res = genl_family_find_byname(name);