From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/8] netfilter: nfnl_cthelper: fix runtime expectation policy updates
Date: Wed, 29 Mar 2017 14:14:04 +0200 [thread overview]
Message-ID: <1490789650-7294-3-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1490789650-7294-1-git-send-email-pablo@netfilter.org>
We only allow runtime updates of expectation policies for timeout and
maximum number of expectations, otherwise reject the update.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Liping Zhang <zlpnobody@gmail.com>
---
net/netfilter/nfnetlink_cthelper.c | 86 +++++++++++++++++++++++++++++++++++++-
1 file changed, 84 insertions(+), 2 deletions(-)
diff --git a/net/netfilter/nfnetlink_cthelper.c b/net/netfilter/nfnetlink_cthelper.c
index 3cd41d105407..90f291e27eb1 100644
--- a/net/netfilter/nfnetlink_cthelper.c
+++ b/net/netfilter/nfnetlink_cthelper.c
@@ -256,6 +256,89 @@ nfnl_cthelper_create(const struct nlattr * const tb[],
}
static int
+nfnl_cthelper_update_policy_one(const struct nf_conntrack_expect_policy *policy,
+ struct nf_conntrack_expect_policy *new_policy,
+ const struct nlattr *attr)
+{
+ struct nlattr *tb[NFCTH_POLICY_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr,
+ nfnl_cthelper_expect_pol);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFCTH_POLICY_NAME] ||
+ !tb[NFCTH_POLICY_EXPECT_MAX] ||
+ !tb[NFCTH_POLICY_EXPECT_TIMEOUT])
+ return -EINVAL;
+
+ if (nla_strcmp(tb[NFCTH_POLICY_NAME], policy->name))
+ return -EBUSY;
+
+ new_policy->max_expected =
+ ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_MAX]));
+ new_policy->timeout =
+ ntohl(nla_get_be32(tb[NFCTH_POLICY_EXPECT_TIMEOUT]));
+
+ return 0;
+}
+
+static int nfnl_cthelper_update_policy_all(struct nlattr *tb[],
+ struct nf_conntrack_helper *helper)
+{
+ struct nf_conntrack_expect_policy new_policy[helper->expect_class_max + 1];
+ struct nf_conntrack_expect_policy *policy;
+ int i, err;
+
+ /* Check first that all policy attributes are well-formed, so we don't
+ * leave things in inconsistent state on errors.
+ */
+ for (i = 0; i < helper->expect_class_max + 1; i++) {
+
+ if (!tb[NFCTH_POLICY_SET + i])
+ return -EINVAL;
+
+ err = nfnl_cthelper_update_policy_one(&helper->expect_policy[i],
+ &new_policy[i],
+ tb[NFCTH_POLICY_SET + i]);
+ if (err < 0)
+ return err;
+ }
+ /* Now we can safely update them. */
+ for (i = 0; i < helper->expect_class_max + 1; i++) {
+ policy = (struct nf_conntrack_expect_policy *)
+ &helper->expect_policy[i];
+ policy->max_expected = new_policy->max_expected;
+ policy->timeout = new_policy->timeout;
+ }
+
+ return 0;
+}
+
+static int nfnl_cthelper_update_policy(struct nf_conntrack_helper *helper,
+ const struct nlattr *attr)
+{
+ struct nlattr *tb[NFCTH_POLICY_SET_MAX + 1];
+ unsigned int class_max;
+ int err;
+
+ err = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr,
+ nfnl_cthelper_expect_policy_set);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFCTH_POLICY_SET_NUM])
+ return -EINVAL;
+
+ class_max = ntohl(nla_get_be32(tb[NFCTH_POLICY_SET_NUM]));
+ if (helper->expect_class_max + 1 != class_max)
+ return -EBUSY;
+
+ return nfnl_cthelper_update_policy_all(tb, helper);
+}
+
+static int
nfnl_cthelper_update(const struct nlattr * const tb[],
struct nf_conntrack_helper *helper)
{
@@ -265,8 +348,7 @@ nfnl_cthelper_update(const struct nlattr * const tb[],
return -EBUSY;
if (tb[NFCTH_POLICY]) {
- ret = nfnl_cthelper_parse_expect_policy(helper,
- tb[NFCTH_POLICY]);
+ ret = nfnl_cthelper_update_policy(helper, tb[NFCTH_POLICY]);
if (ret < 0)
return ret;
}
--
2.1.4
next prev parent reply other threads:[~2017-03-29 12:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-29 12:14 [PATCH 0/8] Netfilter fixes for net Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 1/8] netfilter: nfnl_cthelper: fix incorrect helper->expect_class_max Pablo Neira Ayuso
2017-03-29 12:14 ` Pablo Neira Ayuso [this message]
2017-03-29 12:14 ` [PATCH 3/8] netfilter: nfnl_cthelper: Fix memory leak Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 4/8] netfilter: invoke synchronize_rcu after set the _hook_ to NULL Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 5/8] netfilter: nfnl_cthelper: fix a race when walk the nf_ct_helper_hash table Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 6/8] netfilter: nf_ct_ext: fix possible panic after nf_ct_extend_unregister Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 7/8] netfilter: nf_nat_snmp: Fix panic when snmp_trap_helper fails to register Pablo Neira Ayuso
2017-03-29 12:14 ` [PATCH 8/8] netfilter: nfnetlink_queue: fix secctx memory leak Pablo Neira Ayuso
2017-03-29 21:39 ` [PATCH 0/8] Netfilter fixes for net David Miller
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