From: Liping Zhang <zlpnobody@xxxxxxxxx>
cthelpers added via nfnetlink may have the same tuple, i.e. except for
the l3proto and l4proto, other fields are all zero. So even with the
different names, we will also fail to add them:
# nfct helper add ssdp inet udp
# nfct helper add tftp inet udp
nfct v1.4.3: netlink error: File exists
So in order to avoid unpredictable behaviour, we should:
1. cthelpers can be selected by nft ct helper obj or xt_CT target, so
report error if duplicated { name, l3proto, l4proto } tuple exist.
2. cthelpers can be selected by nf_ct_tuple_src_mask_cmp when
nf_ct_auto_assign_helper is enabled, so also report error if duplicated
{ l3proto, l4proto, src-port } tuple exist.
Also note, if the cthelper is added from userspace, then the src-port will
always be zero, it's invalid for nf_ct_auto_assign_helper, so there's no
need to check the second point listed above.
Fixes: 893e093c786c ("netfilter: nf_ct_helper: bail out on duplicated helpers")
Signed-off-by: Liping Zhang <zlpnobody@xxxxxxxxx>
---
V2: drop to use __nf_conntrack_helper_find which may cause annoying
rcu warning when debug is enabled, spotted by Pablo.
net/netfilter/nf_conntrack_helper.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 6dc44d9..92e69af 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -379,17 +379,33 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) };
unsigned int h = helper_hash(&me->tuple);
struct nf_conntrack_helper *cur;
- int ret = 0;
+ int ret = 0, i;
BUG_ON(me->expect_policy == NULL);
BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES);
BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1);
mutex_lock(&nf_ct_helper_mutex);
- hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) {
- if (nf_ct_tuple_src_mask_cmp(&cur->tuple, &me->tuple, &mask)) {
- ret = -EEXIST;
- goto out;
+ for (i = 0; i < nf_ct_helper_hsize; i++) {
+ hlist_for_each_entry(cur, &nf_ct_helper_hash[i], hnode) {
+ if (!strcmp(cur->name, me->name) &&
+ (cur->tuple.src.l3num == NFPROTO_UNSPEC ||
+ cur->tuple.src.l3num == me->tuple.src.l3num) &&
+ cur->tuple.dst.protonum == me->tuple.dst.protonum) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+ }
+
+ /* avoid unpredictable behaviour for auto_assign_helper */
+ if (!(me->flags & NF_CT_HELPER_F_USERSPACE)) {
+ hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) {
+ if (nf_ct_tuple_src_mask_cmp(&cur->tuple, &me->tuple,
+ &mask)) {
+ ret = -EEXIST;
+ goto out;
+ }
}
}
hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]);
--
2.5.5
--
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