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>
diff --git a/net/wimax/op-msg.c b/net/wimax/op-msg.c
index f37dd3c..c278b33 100644
--- a/net/wimax/op-msg.c
+++ b/net/wimax/op-msg.c
@@ -279,8 +279,7 @@
d_printf(1, dev, "CTX: wimax msg, %zu bytes\n", size);
d_dump(2, dev, msg, size);
- genlmsg_multicast(&wimax_gnl_family, skb, 0,
- wimax_gnl_mcg.id, GFP_KERNEL);
+ genlmsg_multicast(&wimax_gnl_family, skb, 0, 0, GFP_KERNEL);
d_printf(1, dev, "CTX: genl multicast done\n");
return 0;
}
diff --git a/net/wimax/stack.c b/net/wimax/stack.c
index 1888874..ef2191b 100644
--- a/net/wimax/stack.c
+++ b/net/wimax/stack.c
@@ -116,8 +116,9 @@
dev_err(dev, "RE_STCH: can't create message\n");
goto error_new;
}
- data = genlmsg_put(report_skb, 0, wimax_gnl_mcg.id, &wimax_gnl_family,
- 0, WIMAX_GNL_RE_STATE_CHANGE);
+ /* FIXME: sending a group ID as the seq is wrong */
+ data = genlmsg_put(report_skb, 0, wimax_gnl_family.mcgrp_offset,
+ &wimax_gnl_family, 0, WIMAX_GNL_RE_STATE_CHANGE);
if (data == NULL) {
dev_err(dev, "RE_STCH: can't put data into message\n");
goto error_put;
@@ -177,8 +178,7 @@
goto out;
}
genlmsg_end(report_skb, header);
- genlmsg_multicast(&wimax_gnl_family, report_skb, 0,
- wimax_gnl_mcg.id, GFP_KERNEL);
+ genlmsg_multicast(&wimax_gnl_family, report_skb, 0, 0, GFP_KERNEL);
out:
d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
wimax_dev, report_skb, result);
@@ -580,8 +580,8 @@
.maxattr = WIMAX_GNL_ATTR_MAX,
};
-struct genl_multicast_group wimax_gnl_mcg = {
- .name = "msg",
+static const struct genl_multicast_group wimax_gnl_mcgrps[] = {
+ { .name = "msg", },
};
@@ -598,21 +598,18 @@
snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
"WiMAX");
- result = genl_register_family_with_ops(&wimax_gnl_family,
- wimax_gnl_ops);
+ result = genl_register_family_with_ops_groups(&wimax_gnl_family,
+ wimax_gnl_ops,
+ wimax_gnl_mcgrps);
if (unlikely(result < 0)) {
printk(KERN_ERR "cannot register generic netlink family: %d\n",
result);
goto error_register_family;
}
- result = genl_register_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
- if (result < 0)
- goto error_mc_group;
d_fnend(4, NULL, "() = 0\n");
return 0;
-error_mc_group:
genl_unregister_family(&wimax_gnl_family);
error_register_family:
d_fnend(4, NULL, "() = %d\n", result);
diff --git a/net/wimax/wimax-internal.h b/net/wimax/wimax-internal.h
index 8567d30..b445b82 100644
--- a/net/wimax/wimax-internal.h
+++ b/net/wimax/wimax-internal.h
@@ -86,7 +86,6 @@
/* generic netlink */
extern struct genl_family wimax_gnl_family;
-extern struct genl_multicast_group wimax_gnl_mcg;
/* ops */
int wimax_gnl_doit_msg_from_user(struct sk_buff *skb, struct genl_info *info);