netfilter: ctnetlink: group errors into logical errno sets
This patch groups ctnetlink errors into three logical sets:
* Malformed messages: if ctnetlink receives a message without some mandatory
attribute, then it returns EINVAL.
* Unsupported operations: if userspace tries to perform an unsupported
operation, then it returns EOPNOTSUPP.
* Unchangeable: if userspace tries to change some attribute of the
conntrack object that can only be set once, then it returns EBUSY.
This patch reduces the number of -EINVAL from 23 to 14 and it results in
5 -EBUSY and 6 -EOPNOTSUPP.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 0edefcf..13918c1 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -4,7 +4,7 @@
* (C) 2001 by Jay Schulist <jschlst@samba.org>
* (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
* (C) 2003 by Patrick Mchardy <kaber@trash.net>
- * (C) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* Initial connection tracking via netlink development funded and
* generally made possible by Network Robots, Inc. (www.networkrobots.com)
@@ -891,20 +891,19 @@
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
/* unchangeable */
- return -EINVAL;
+ return -EBUSY;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
/* SEEN_REPLY bit can only be set */
- return -EINVAL;
-
+ return -EBUSY;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
/* ASSURED bit can only be set */
- return -EINVAL;
+ return -EBUSY;
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
#ifndef CONFIG_NF_NAT_NEEDED
- return -EINVAL;
+ return -EOPNOTSUPP;
#else
struct nf_nat_range range;
@@ -945,7 +944,7 @@
/* don't change helper of sibling connections */
if (ct->master)
- return -EINVAL;
+ return -EBUSY;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
if (err < 0)
@@ -963,7 +962,7 @@
helper = __nf_conntrack_helper_find_byname(helpname);
if (helper == NULL)
- return -EINVAL;
+ return -EOPNOTSUPP;
if (help) {
if (help->helper == helper)
@@ -1258,12 +1257,12 @@
if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
- err = -EINVAL;
+ err = -EOPNOTSUPP;
goto out_unlock;
}
/* can't link an existing conntrack to a master */
if (cda[CTA_TUPLE_MASTER]) {
- err = -EINVAL;
+ err = -EOPNOTSUPP;
goto out_unlock;
}
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
@@ -1608,7 +1607,7 @@
h = __nf_conntrack_helper_find_byname(name);
if (!h) {
spin_unlock_bh(&nf_conntrack_lock);
- return -EINVAL;
+ return -EOPNOTSUPP;
}
for (i = 0; i < nf_ct_expect_hsize; i++) {
hlist_for_each_entry_safe(exp, n, next,