Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 279 insertions, 0 deletions

diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
new file mode 100644
index 0000000000..0d7aee8933
--- /dev/null
+++ b/net/sched/act_connmark.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_connmark.c  netfilter connmark retriever action
+ * skb mark is over-written
+ *
+ * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/pkt_cls.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+#include <uapi/linux/tc_act/tc_connmark.h>
+#include <net/tc_act/tc_connmark.h>
+#include <net/tc_wrapper.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_zones.h>
+
+static struct tc_action_ops act_connmark_ops;
+
+TC_INDIRECT_SCOPE int tcf_connmark_act(struct sk_buff *skb,
+				       const struct tc_action *a,
+				       struct tcf_result *res)
+{
+	const struct nf_conntrack_tuple_hash *thash;
+	struct nf_conntrack_tuple tuple;
+	enum ip_conntrack_info ctinfo;
+	struct tcf_connmark_info *ca = to_connmark(a);
+	struct tcf_connmark_parms *parms;
+	struct nf_conntrack_zone zone;
+	struct nf_conn *c;
+	int proto;
+
+	tcf_lastuse_update(&ca->tcf_tm);
+	tcf_action_update_bstats(&ca->common, skb);
+
+	parms = rcu_dereference_bh(ca->parms);
+
+	switch (skb_protocol(skb, true)) {
+	case htons(ETH_P_IP):
+		if (skb->len < sizeof(struct iphdr))
+			goto out;
+
+		proto = NFPROTO_IPV4;
+		break;
+	case htons(ETH_P_IPV6):
+		if (skb->len < sizeof(struct ipv6hdr))
+			goto out;
+
+		proto = NFPROTO_IPV6;
+		break;
+	default:
+		goto out;
+	}
+
+	c = nf_ct_get(skb, &ctinfo);
+	if (c) {
+		skb->mark = READ_ONCE(c->mark);
+		goto count;
+	}
+
+	if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, parms->net,
+			       &tuple))
+		goto out;
+
+	zone.id = parms->zone;
+	zone.dir = NF_CT_DEFAULT_ZONE_DIR;
+
+	thash = nf_conntrack_find_get(parms->net, &zone, &tuple);
+	if (!thash)
+		goto out;
+
+	c = nf_ct_tuplehash_to_ctrack(thash);
+	skb->mark = READ_ONCE(c->mark);
+	nf_ct_put(c);
+
+count:
+	/* using overlimits stats to count how many packets marked */
+	tcf_action_inc_overlimit_qstats(&ca->common);
+out:
+	return READ_ONCE(ca->tcf_action);
+}
+
+static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
+	[TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
+};
+
+static int tcf_connmark_init(struct net *net, struct nlattr *nla,
+			     struct nlattr *est, struct tc_action **a,
+			     struct tcf_proto *tp, u32 flags,
+			     struct netlink_ext_ack *extack)
+{
+	struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
+	struct tcf_connmark_parms *nparms, *oparms;
+	struct nlattr *tb[TCA_CONNMARK_MAX + 1];
+	bool bind = flags & TCA_ACT_FLAGS_BIND;
+	struct tcf_chain *goto_ch = NULL;
+	struct tcf_connmark_info *ci;
+	struct tc_connmark *parm;
+	int ret = 0, err;
+	u32 index;
+
+	if (!nla)
+		return -EINVAL;
+
+	ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
+					  connmark_policy, NULL);
+	if (ret < 0)
+		return ret;
+
+	if (!tb[TCA_CONNMARK_PARMS])
+		return -EINVAL;
+
+	nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
+	if (!nparms)
+		return -ENOMEM;
+
+	parm = nla_data(tb[TCA_CONNMARK_PARMS]);
+	index = parm->index;
+	ret = tcf_idr_check_alloc(tn, &index, a, bind);
+	if (!ret) {
+		ret = tcf_idr_create_from_flags(tn, index, est, a,
+						&act_connmark_ops, bind, flags);
+		if (ret) {
+			tcf_idr_cleanup(tn, index);
+			err = ret;
+			goto out_free;
+		}
+
+		ci = to_connmark(*a);
+
+		nparms->net = net;
+		nparms->zone = parm->zone;
+
+		ret = ACT_P_CREATED;
+	} else if (ret > 0) {
+		ci = to_connmark(*a);
+		if (bind) {
+			err = 0;
+			goto out_free;
+		}
+		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+			err = -EEXIST;
+			goto release_idr;
+		}
+
+		nparms->net = rtnl_dereference(ci->parms)->net;
+		nparms->zone = parm->zone;
+
+		ret = 0;
+	} else {
+		err = ret;
+		goto out_free;
+	}
+
+	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+	if (err < 0)
+		goto release_idr;
+
+	spin_lock_bh(&ci->tcf_lock);
+	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+	oparms = rcu_replace_pointer(ci->parms, nparms, lockdep_is_held(&ci->tcf_lock));
+	spin_unlock_bh(&ci->tcf_lock);
+
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+
+	if (oparms)
+		kfree_rcu(oparms, rcu);
+
+	return ret;
+
+release_idr:
+	tcf_idr_release(*a, bind);
+out_free:
+	kfree(nparms);
+	return err;
+}
+
+static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
+				    int bind, int ref)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tcf_connmark_info *ci = to_connmark(a);
+	struct tc_connmark opt = {
+		.index   = ci->tcf_index,
+		.refcnt  = refcount_read(&ci->tcf_refcnt) - ref,
+		.bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
+	};
+	struct tcf_connmark_parms *parms;
+	struct tcf_t t;
+
+	spin_lock_bh(&ci->tcf_lock);
+	parms = rcu_dereference_protected(ci->parms, lockdep_is_held(&ci->tcf_lock));
+
+	opt.action = ci->tcf_action;
+	opt.zone = parms->zone;
+	if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
+		goto nla_put_failure;
+
+	tcf_tm_dump(&t, &ci->tcf_tm);
+	if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
+			  TCA_CONNMARK_PAD))
+		goto nla_put_failure;
+	spin_unlock_bh(&ci->tcf_lock);
+
+	return skb->len;
+
+nla_put_failure:
+	spin_unlock_bh(&ci->tcf_lock);
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static void tcf_connmark_cleanup(struct tc_action *a)
+{
+	struct tcf_connmark_info *ci = to_connmark(a);
+	struct tcf_connmark_parms *parms;
+
+	parms = rcu_dereference_protected(ci->parms, 1);
+	if (parms)
+		kfree_rcu(parms, rcu);
+}
+
+static struct tc_action_ops act_connmark_ops = {
+	.kind		=	"connmark",
+	.id		=	TCA_ID_CONNMARK,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_connmark_act,
+	.dump		=	tcf_connmark_dump,
+	.init		=	tcf_connmark_init,
+	.cleanup	=	tcf_connmark_cleanup,
+	.size		=	sizeof(struct tcf_connmark_info),
+};
+
+static __net_init int connmark_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
+
+	return tc_action_net_init(net, tn, &act_connmark_ops);
+}
+
+static void __net_exit connmark_exit_net(struct list_head *net_list)
+{
+	tc_action_net_exit(net_list, act_connmark_ops.net_id);
+}
+
+static struct pernet_operations connmark_net_ops = {
+	.init = connmark_init_net,
+	.exit_batch = connmark_exit_net,
+	.id   = &act_connmark_ops.net_id,
+	.size = sizeof(struct tc_action_net),
+};
+
+static int __init connmark_init_module(void)
+{
+	return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
+}
+
+static void __exit connmark_cleanup_module(void)
+{
+	tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
+}
+
+module_init(connmark_init_module);
+module_exit(connmark_cleanup_module);
+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
+MODULE_DESCRIPTION("Connection tracking mark restoring");
+MODULE_LICENSE("GPL");