1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net/sched/act_connmark.c netfilter connmark retriever action
4 * skb mark is over-written
6 * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/skbuff.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/pkt_cls.h>
16 #include <linux/ipv6.h>
17 #include <net/netlink.h>
18 #include <net/pkt_sched.h>
19 #include <net/act_api.h>
20 #include <net/pkt_cls.h>
21 #include <uapi/linux/tc_act/tc_connmark.h>
22 #include <net/tc_act/tc_connmark.h>
24 #include <net/netfilter/nf_conntrack.h>
25 #include <net/netfilter/nf_conntrack_core.h>
26 #include <net/netfilter/nf_conntrack_zones.h>
28 static unsigned int connmark_net_id;
29 static struct tc_action_ops act_connmark_ops;
31 static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
32 struct tcf_result *res)
34 const struct nf_conntrack_tuple_hash *thash;
35 struct nf_conntrack_tuple tuple;
36 enum ip_conntrack_info ctinfo;
37 struct tcf_connmark_info *ca = to_connmark(a);
38 struct nf_conntrack_zone zone;
42 spin_lock(&ca->tcf_lock);
43 tcf_lastuse_update(&ca->tcf_tm);
44 bstats_update(&ca->tcf_bstats, skb);
46 if (skb->protocol == htons(ETH_P_IP)) {
47 if (skb->len < sizeof(struct iphdr))
51 } else if (skb->protocol == htons(ETH_P_IPV6)) {
52 if (skb->len < sizeof(struct ipv6hdr))
60 c = nf_ct_get(skb, &ctinfo);
63 /* using overlimits stats to count how many packets marked */
64 ca->tcf_qstats.overlimits++;
68 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
69 proto, ca->net, &tuple))
73 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
75 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
79 c = nf_ct_tuplehash_to_ctrack(thash);
80 /* using overlimits stats to count how many packets marked */
81 ca->tcf_qstats.overlimits++;
86 spin_unlock(&ca->tcf_lock);
87 return ca->tcf_action;
90 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
91 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
94 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
95 struct nlattr *est, struct tc_action **a,
96 int ovr, int bind, bool rtnl_held,
98 struct netlink_ext_ack *extack)
100 struct tc_action_net *tn = net_generic(net, connmark_net_id);
101 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
102 struct tcf_chain *goto_ch = NULL;
103 struct tcf_connmark_info *ci;
104 struct tc_connmark *parm;
110 ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
111 connmark_policy, NULL);
115 if (!tb[TCA_CONNMARK_PARMS])
118 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
120 ret = tcf_idr_check_alloc(tn, &parm->index, a, bind);
122 ret = tcf_idr_create(tn, parm->index, est, a,
123 &act_connmark_ops, bind, false);
125 tcf_idr_cleanup(tn, parm->index);
129 ci = to_connmark(*a);
130 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
134 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
136 ci->zone = parm->zone;
138 tcf_idr_insert(tn, *a);
140 } else if (ret > 0) {
141 ci = to_connmark(*a);
145 tcf_idr_release(*a, bind);
148 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
152 /* replacing action and zone */
153 spin_lock_bh(&ci->tcf_lock);
154 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
155 ci->zone = parm->zone;
156 spin_unlock_bh(&ci->tcf_lock);
158 tcf_chain_put_by_act(goto_ch);
164 tcf_idr_release(*a, bind);
168 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
171 unsigned char *b = skb_tail_pointer(skb);
172 struct tcf_connmark_info *ci = to_connmark(a);
173 struct tc_connmark opt = {
174 .index = ci->tcf_index,
175 .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
176 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
180 spin_lock_bh(&ci->tcf_lock);
181 opt.action = ci->tcf_action;
183 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
184 goto nla_put_failure;
186 tcf_tm_dump(&t, &ci->tcf_tm);
187 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
189 goto nla_put_failure;
190 spin_unlock_bh(&ci->tcf_lock);
195 spin_unlock_bh(&ci->tcf_lock);
200 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
201 struct netlink_callback *cb, int type,
202 const struct tc_action_ops *ops,
203 struct netlink_ext_ack *extack)
205 struct tc_action_net *tn = net_generic(net, connmark_net_id);
207 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
210 static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
212 struct tc_action_net *tn = net_generic(net, connmark_net_id);
214 return tcf_idr_search(tn, a, index);
217 static struct tc_action_ops act_connmark_ops = {
219 .id = TCA_ID_CONNMARK,
220 .owner = THIS_MODULE,
221 .act = tcf_connmark_act,
222 .dump = tcf_connmark_dump,
223 .init = tcf_connmark_init,
224 .walk = tcf_connmark_walker,
225 .lookup = tcf_connmark_search,
226 .size = sizeof(struct tcf_connmark_info),
229 static __net_init int connmark_init_net(struct net *net)
231 struct tc_action_net *tn = net_generic(net, connmark_net_id);
233 return tc_action_net_init(tn, &act_connmark_ops);
236 static void __net_exit connmark_exit_net(struct list_head *net_list)
238 tc_action_net_exit(net_list, connmark_net_id);
241 static struct pernet_operations connmark_net_ops = {
242 .init = connmark_init_net,
243 .exit_batch = connmark_exit_net,
244 .id = &connmark_net_id,
245 .size = sizeof(struct tc_action_net),
248 static int __init connmark_init_module(void)
250 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
253 static void __exit connmark_cleanup_module(void)
255 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
258 module_init(connmark_init_module);
259 module_exit(connmark_cleanup_module);
260 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
261 MODULE_DESCRIPTION("Connection tracking mark restoring");
262 MODULE_LICENSE("GPL");