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authorJohannes Berg <johannes.berg@intel.com>2013-11-19 18:19:39 +0400
committerDavid S. Miller <davem@davemloft.net>2013-11-20 01:39:06 +0400
commit2a94fe48f32ccf7321450a2cc07f2b724a444e5b (patch)
treee5a066d8f83d8822d448421019a4503f361295f9 /drivers
parent68eb55031da7c967d954e5f9415cd05f4abdb692 (diff)
downloadlinux-2a94fe48f32ccf7321450a2cc07f2b724a444e5b.tar.xz
genetlink: make multicast groups const, prevent abuse
Register generic netlink multicast groups as an array with the family and give them contiguous group IDs. Then instead of passing the global group ID to the various functions that send messages, pass the ID relative to the family - for most families that's just 0 because the only have one group. This avoids the list_head and ID in each group, adding a new field for the mcast group ID offset to the family. At the same time, this allows us to prevent abusing groups again like the quota and dropmon code did, since we can now check that a family only uses a group it owns. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/event.c26
-rw-r--r--drivers/net/team/team.c25
-rw-r--r--drivers/thermal/thermal_core.c24
3 files changed, 21 insertions, 54 deletions
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index 68a8755202ec..aeb5aa6ce068 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -78,15 +78,17 @@ enum {
#define ACPI_GENL_VERSION 0x01
#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
+static const struct genl_multicast_group acpi_event_mcgrps[] = {
+ { .name = ACPI_GENL_MCAST_GROUP_NAME, },
+};
+
static struct genl_family acpi_event_genl_family = {
.id = GENL_ID_GENERATE,
.name = ACPI_GENL_FAMILY_NAME,
.version = ACPI_GENL_VERSION,
.maxattr = ACPI_GENL_ATTR_MAX,
-};
-
-static struct genl_multicast_group acpi_event_mcgrp = {
- .name = ACPI_GENL_MCAST_GROUP_NAME,
+ .mcgrps = acpi_event_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
};
int acpi_bus_generate_netlink_event(const char *device_class,
@@ -146,8 +148,7 @@ int acpi_bus_generate_netlink_event(const char *device_class,
return result;
}
- genlmsg_multicast(&acpi_event_genl_family,
- skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
+ genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
return 0;
}
@@ -155,18 +156,7 @@ EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
static int acpi_event_genetlink_init(void)
{
- int result;
-
- result = genl_register_family(&acpi_event_genl_family);
- if (result)
- return result;
-
- result = genl_register_mc_group(&acpi_event_genl_family,
- &acpi_event_mcgrp);
- if (result)
- genl_unregister_family(&acpi_event_genl_family);
-
- return result;
+ return genl_register_family(&acpi_event_genl_family);
}
#else
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 2721e29935a6..0715de50b3dc 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2670,16 +2670,15 @@ static const struct genl_ops team_nl_ops[] = {
},
};
-static struct genl_multicast_group team_change_event_mcgrp = {
- .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
+static const struct genl_multicast_group team_nl_mcgrps[] = {
+ { .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME, },
};
static int team_nl_send_multicast(struct sk_buff *skb,
struct team *team, u32 portid)
{
return genlmsg_multicast_netns(&team_nl_family, dev_net(team->dev),
- skb, 0, team_change_event_mcgrp.id,
- GFP_KERNEL);
+ skb, 0, 0, GFP_KERNEL);
}
static int team_nl_send_event_options_get(struct team *team,
@@ -2698,22 +2697,8 @@ static int team_nl_send_event_port_get(struct team *team,
static int team_nl_init(void)
{
- int err;
-
- err = genl_register_family_with_ops(&team_nl_family, team_nl_ops);
- if (err)
- return err;
-
- err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
- if (err)
- goto err_change_event_grp_reg;
-
- return 0;
-
-err_change_event_grp_reg:
- genl_unregister_family(&team_nl_family);
-
- return err;
+ return genl_register_family_with_ops_groups(&team_nl_family, team_nl_ops,
+ team_nl_mcgrps);
}
static void team_nl_fini(void)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 2570a944fffc..19edd6124ca3 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1606,15 +1606,17 @@ exit:
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
#ifdef CONFIG_NET
+static const struct genl_multicast_group thermal_event_mcgrps[] = {
+ { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
+};
+
static struct genl_family thermal_event_genl_family = {
.id = GENL_ID_GENERATE,
.name = THERMAL_GENL_FAMILY_NAME,
.version = THERMAL_GENL_VERSION,
.maxattr = THERMAL_GENL_ATTR_MAX,
-};
-
-static struct genl_multicast_group thermal_event_mcgrp = {
- .name = THERMAL_GENL_MCAST_GROUP_NAME,
+ .mcgrps = thermal_event_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
};
int thermal_generate_netlink_event(struct thermal_zone_device *tz,
@@ -1676,7 +1678,7 @@ int thermal_generate_netlink_event(struct thermal_zone_device *tz,
}
result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
- thermal_event_mcgrp.id, GFP_ATOMIC);
+ 0, GFP_ATOMIC);
if (result)
dev_err(&tz->device, "Failed to send netlink event:%d", result);
@@ -1686,17 +1688,7 @@ EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
static int genetlink_init(void)
{
- int result;
-
- result = genl_register_family(&thermal_event_genl_family);
- if (result)
- return result;
-
- result = genl_register_mc_group(&thermal_event_genl_family,
- &thermal_event_mcgrp);
- if (result)
- genl_unregister_family(&thermal_event_genl_family);
- return result;
+ return genl_register_family(&thermal_event_genl_family);
}
static void genetlink_exit(void)