12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
222a5dc0eSFelix Fietkau /*
322a5dc0eSFelix Fietkau * net/sched/act_connmark.c netfilter connmark retriever action
422a5dc0eSFelix Fietkau * skb mark is over-written
522a5dc0eSFelix Fietkau *
622a5dc0eSFelix Fietkau * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
722a5dc0eSFelix Fietkau */
822a5dc0eSFelix Fietkau
922a5dc0eSFelix Fietkau #include <linux/module.h>
1022a5dc0eSFelix Fietkau #include <linux/init.h>
1122a5dc0eSFelix Fietkau #include <linux/kernel.h>
1222a5dc0eSFelix Fietkau #include <linux/skbuff.h>
1322a5dc0eSFelix Fietkau #include <linux/rtnetlink.h>
1422a5dc0eSFelix Fietkau #include <linux/pkt_cls.h>
1522a5dc0eSFelix Fietkau #include <linux/ip.h>
1622a5dc0eSFelix Fietkau #include <linux/ipv6.h>
1722a5dc0eSFelix Fietkau #include <net/netlink.h>
1822a5dc0eSFelix Fietkau #include <net/pkt_sched.h>
1922a5dc0eSFelix Fietkau #include <net/act_api.h>
20c53075eaSDavide Caratti #include <net/pkt_cls.h>
2122a5dc0eSFelix Fietkau #include <uapi/linux/tc_act/tc_connmark.h>
2222a5dc0eSFelix Fietkau #include <net/tc_act/tc_connmark.h>
23871cf386SPedro Tammela #include <net/tc_wrapper.h>
2422a5dc0eSFelix Fietkau
2522a5dc0eSFelix Fietkau #include <net/netfilter/nf_conntrack.h>
2622a5dc0eSFelix Fietkau #include <net/netfilter/nf_conntrack_core.h>
2722a5dc0eSFelix Fietkau #include <net/netfilter/nf_conntrack_zones.h>
2822a5dc0eSFelix Fietkau
29a85a970aSWANG Cong static struct tc_action_ops act_connmark_ops;
30ddf97ccdSWANG Cong
tcf_connmark_act(struct sk_buff * skb,const struct tc_action * a,struct tcf_result * res)31871cf386SPedro Tammela TC_INDIRECT_SCOPE int tcf_connmark_act(struct sk_buff *skb,
32871cf386SPedro Tammela const struct tc_action *a,
3322a5dc0eSFelix Fietkau struct tcf_result *res)
3422a5dc0eSFelix Fietkau {
3522a5dc0eSFelix Fietkau const struct nf_conntrack_tuple_hash *thash;
3622a5dc0eSFelix Fietkau struct nf_conntrack_tuple tuple;
3722a5dc0eSFelix Fietkau enum ip_conntrack_info ctinfo;
38a85a970aSWANG Cong struct tcf_connmark_info *ca = to_connmark(a);
39288864efSPedro Tammela struct tcf_connmark_parms *parms;
40308ac914SDaniel Borkmann struct nf_conntrack_zone zone;
4122a5dc0eSFelix Fietkau struct nf_conn *c;
4222a5dc0eSFelix Fietkau int proto;
4322a5dc0eSFelix Fietkau
449c4a4e48SJamal Hadi Salim tcf_lastuse_update(&ca->tcf_tm);
45288864efSPedro Tammela tcf_action_update_bstats(&ca->common, skb);
46288864efSPedro Tammela
47288864efSPedro Tammela parms = rcu_dereference_bh(ca->parms);
4822a5dc0eSFelix Fietkau
49d7bf2ebeSToke Høiland-Jørgensen switch (skb_protocol(skb, true)) {
50d7bf2ebeSToke Høiland-Jørgensen case htons(ETH_P_IP):
5122a5dc0eSFelix Fietkau if (skb->len < sizeof(struct iphdr))
5222a5dc0eSFelix Fietkau goto out;
5322a5dc0eSFelix Fietkau
5422a5dc0eSFelix Fietkau proto = NFPROTO_IPV4;
55d7bf2ebeSToke Høiland-Jørgensen break;
56d7bf2ebeSToke Høiland-Jørgensen case htons(ETH_P_IPV6):
5722a5dc0eSFelix Fietkau if (skb->len < sizeof(struct ipv6hdr))
5822a5dc0eSFelix Fietkau goto out;
5922a5dc0eSFelix Fietkau
6022a5dc0eSFelix Fietkau proto = NFPROTO_IPV6;
61d7bf2ebeSToke Høiland-Jørgensen break;
62d7bf2ebeSToke Høiland-Jørgensen default:
6322a5dc0eSFelix Fietkau goto out;
6422a5dc0eSFelix Fietkau }
6522a5dc0eSFelix Fietkau
6622a5dc0eSFelix Fietkau c = nf_ct_get(skb, &ctinfo);
6722a5dc0eSFelix Fietkau if (c) {
6852d1aa8bSDaniel Xu skb->mark = READ_ONCE(c->mark);
69288864efSPedro Tammela goto count;
7022a5dc0eSFelix Fietkau }
7122a5dc0eSFelix Fietkau
72288864efSPedro Tammela if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, parms->net,
73288864efSPedro Tammela &tuple))
7422a5dc0eSFelix Fietkau goto out;
7522a5dc0eSFelix Fietkau
76288864efSPedro Tammela zone.id = parms->zone;
77deedb590SDaniel Borkmann zone.dir = NF_CT_DEFAULT_ZONE_DIR;
78308ac914SDaniel Borkmann
79288864efSPedro Tammela thash = nf_conntrack_find_get(parms->net, &zone, &tuple);
8022a5dc0eSFelix Fietkau if (!thash)
8122a5dc0eSFelix Fietkau goto out;
8222a5dc0eSFelix Fietkau
8322a5dc0eSFelix Fietkau c = nf_ct_tuplehash_to_ctrack(thash);
8452d1aa8bSDaniel Xu skb->mark = READ_ONCE(c->mark);
8522a5dc0eSFelix Fietkau nf_ct_put(c);
8622a5dc0eSFelix Fietkau
87288864efSPedro Tammela count:
88288864efSPedro Tammela /* using overlimits stats to count how many packets marked */
89288864efSPedro Tammela tcf_action_inc_overlimit_qstats(&ca->common);
9022a5dc0eSFelix Fietkau out:
91288864efSPedro Tammela return READ_ONCE(ca->tcf_action);
9222a5dc0eSFelix Fietkau }
9322a5dc0eSFelix Fietkau
9422a5dc0eSFelix Fietkau static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
9522a5dc0eSFelix Fietkau [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
9622a5dc0eSFelix Fietkau };
9722a5dc0eSFelix Fietkau
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)9822a5dc0eSFelix Fietkau static int tcf_connmark_init(struct net *net, struct nlattr *nla,
99a85a970aSWANG Cong struct nlattr *est, struct tc_action **a,
100abbb0d33SVlad Buslov struct tcf_proto *tp, u32 flags,
101589dad6dSAlexander Aring struct netlink_ext_ack *extack)
10222a5dc0eSFelix Fietkau {
103acd0a7abSZhengchao Shao struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
104288864efSPedro Tammela struct tcf_connmark_parms *nparms, *oparms;
10522a5dc0eSFelix Fietkau struct nlattr *tb[TCA_CONNMARK_MAX + 1];
106695176bfSCong Wang bool bind = flags & TCA_ACT_FLAGS_BIND;
107c53075eaSDavide Caratti struct tcf_chain *goto_ch = NULL;
10822a5dc0eSFelix Fietkau struct tcf_connmark_info *ci;
10922a5dc0eSFelix Fietkau struct tc_connmark *parm;
110c53075eaSDavide Caratti int ret = 0, err;
1117be8ef2cSDmytro Linkin u32 index;
11222a5dc0eSFelix Fietkau
11322a5dc0eSFelix Fietkau if (!nla)
11422a5dc0eSFelix Fietkau return -EINVAL;
11522a5dc0eSFelix Fietkau
1168cb08174SJohannes Berg ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
1178cb08174SJohannes Berg connmark_policy, NULL);
11822a5dc0eSFelix Fietkau if (ret < 0)
11922a5dc0eSFelix Fietkau return ret;
12022a5dc0eSFelix Fietkau
12152491c76SEtienne Noss if (!tb[TCA_CONNMARK_PARMS])
12252491c76SEtienne Noss return -EINVAL;
12352491c76SEtienne Noss
124288864efSPedro Tammela nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
125288864efSPedro Tammela if (!nparms)
126288864efSPedro Tammela return -ENOMEM;
127288864efSPedro Tammela
12822a5dc0eSFelix Fietkau parm = nla_data(tb[TCA_CONNMARK_PARMS]);
1297be8ef2cSDmytro Linkin index = parm->index;
1307be8ef2cSDmytro Linkin ret = tcf_idr_check_alloc(tn, &index, a, bind);
1310190c1d4SVlad Buslov if (!ret) {
132288864efSPedro Tammela ret = tcf_idr_create_from_flags(tn, index, est, a,
133288864efSPedro Tammela &act_connmark_ops, bind, flags);
1340190c1d4SVlad Buslov if (ret) {
1357be8ef2cSDmytro Linkin tcf_idr_cleanup(tn, index);
136288864efSPedro Tammela err = ret;
137288864efSPedro Tammela goto out_free;
1380190c1d4SVlad Buslov }
13922a5dc0eSFelix Fietkau
140a85a970aSWANG Cong ci = to_connmark(*a);
141288864efSPedro Tammela
142288864efSPedro Tammela nparms->net = net;
143288864efSPedro Tammela nparms->zone = parm->zone;
14422a5dc0eSFelix Fietkau
14522a5dc0eSFelix Fietkau ret = ACT_P_CREATED;
1460190c1d4SVlad Buslov } else if (ret > 0) {
147a85a970aSWANG Cong ci = to_connmark(*a);
148288864efSPedro Tammela if (bind) {
149288864efSPedro Tammela err = 0;
150288864efSPedro Tammela goto out_free;
1514e8ddd7fSVlad Buslov }
152288864efSPedro Tammela if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
153288864efSPedro Tammela err = -EEXIST;
154c53075eaSDavide Caratti goto release_idr;
155288864efSPedro Tammela }
156288864efSPedro Tammela
157288864efSPedro Tammela nparms->net = rtnl_dereference(ci->parms)->net;
158288864efSPedro Tammela nparms->zone = parm->zone;
159288864efSPedro Tammela
1600190c1d4SVlad Buslov ret = 0;
161*fb073904SPedro Tammela } else {
162*fb073904SPedro Tammela err = ret;
163*fb073904SPedro Tammela goto out_free;
16422a5dc0eSFelix Fietkau }
16522a5dc0eSFelix Fietkau
166288864efSPedro Tammela err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
167288864efSPedro Tammela if (err < 0)
168288864efSPedro Tammela goto release_idr;
169288864efSPedro Tammela
170288864efSPedro Tammela spin_lock_bh(&ci->tcf_lock);
171288864efSPedro Tammela goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
172288864efSPedro Tammela oparms = rcu_replace_pointer(ci->parms, nparms, lockdep_is_held(&ci->tcf_lock));
173288864efSPedro Tammela spin_unlock_bh(&ci->tcf_lock);
174288864efSPedro Tammela
175288864efSPedro Tammela if (goto_ch)
176288864efSPedro Tammela tcf_chain_put_by_act(goto_ch);
177288864efSPedro Tammela
178288864efSPedro Tammela if (oparms)
179288864efSPedro Tammela kfree_rcu(oparms, rcu);
180288864efSPedro Tammela
18122a5dc0eSFelix Fietkau return ret;
182288864efSPedro Tammela
183c53075eaSDavide Caratti release_idr:
184c53075eaSDavide Caratti tcf_idr_release(*a, bind);
185288864efSPedro Tammela out_free:
186288864efSPedro Tammela kfree(nparms);
187c53075eaSDavide Caratti return err;
18822a5dc0eSFelix Fietkau }
18922a5dc0eSFelix Fietkau
tcf_connmark_dump(struct sk_buff * skb,struct tc_action * a,int bind,int ref)19022a5dc0eSFelix Fietkau static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
19122a5dc0eSFelix Fietkau int bind, int ref)
19222a5dc0eSFelix Fietkau {
19322a5dc0eSFelix Fietkau unsigned char *b = skb_tail_pointer(skb);
194a85a970aSWANG Cong struct tcf_connmark_info *ci = to_connmark(a);
19522a5dc0eSFelix Fietkau struct tc_connmark opt = {
19622a5dc0eSFelix Fietkau .index = ci->tcf_index,
197036bb443SVlad Buslov .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
198036bb443SVlad Buslov .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
19922a5dc0eSFelix Fietkau };
200288864efSPedro Tammela struct tcf_connmark_parms *parms;
20122a5dc0eSFelix Fietkau struct tcf_t t;
20222a5dc0eSFelix Fietkau
203506a03aaSCong Wang spin_lock_bh(&ci->tcf_lock);
204288864efSPedro Tammela parms = rcu_dereference_protected(ci->parms, lockdep_is_held(&ci->tcf_lock));
205288864efSPedro Tammela
206506a03aaSCong Wang opt.action = ci->tcf_action;
207288864efSPedro Tammela opt.zone = parms->zone;
20822a5dc0eSFelix Fietkau if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
20922a5dc0eSFelix Fietkau goto nla_put_failure;
21022a5dc0eSFelix Fietkau
21148d8ee16SJamal Hadi Salim tcf_tm_dump(&t, &ci->tcf_tm);
2129854518eSNicolas Dichtel if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
2139854518eSNicolas Dichtel TCA_CONNMARK_PAD))
21422a5dc0eSFelix Fietkau goto nla_put_failure;
215506a03aaSCong Wang spin_unlock_bh(&ci->tcf_lock);
21622a5dc0eSFelix Fietkau
21722a5dc0eSFelix Fietkau return skb->len;
218506a03aaSCong Wang
21922a5dc0eSFelix Fietkau nla_put_failure:
220506a03aaSCong Wang spin_unlock_bh(&ci->tcf_lock);
22122a5dc0eSFelix Fietkau nlmsg_trim(skb, b);
22222a5dc0eSFelix Fietkau return -1;
22322a5dc0eSFelix Fietkau }
22422a5dc0eSFelix Fietkau
tcf_connmark_cleanup(struct tc_action * a)225288864efSPedro Tammela static void tcf_connmark_cleanup(struct tc_action *a)
226288864efSPedro Tammela {
227288864efSPedro Tammela struct tcf_connmark_info *ci = to_connmark(a);
228288864efSPedro Tammela struct tcf_connmark_parms *parms;
229288864efSPedro Tammela
230288864efSPedro Tammela parms = rcu_dereference_protected(ci->parms, 1);
231288864efSPedro Tammela if (parms)
232288864efSPedro Tammela kfree_rcu(parms, rcu);
233288864efSPedro Tammela }
234288864efSPedro Tammela
23522a5dc0eSFelix Fietkau static struct tc_action_ops act_connmark_ops = {
23622a5dc0eSFelix Fietkau .kind = "connmark",
237eddd2cf1SEli Cohen .id = TCA_ID_CONNMARK,
23822a5dc0eSFelix Fietkau .owner = THIS_MODULE,
239962ad1f9SJamal Hadi Salim .act = tcf_connmark_act,
24022a5dc0eSFelix Fietkau .dump = tcf_connmark_dump,
24122a5dc0eSFelix Fietkau .init = tcf_connmark_init,
242288864efSPedro Tammela .cleanup = tcf_connmark_cleanup,
243a85a970aSWANG Cong .size = sizeof(struct tcf_connmark_info),
244ddf97ccdSWANG Cong };
245ddf97ccdSWANG Cong
connmark_init_net(struct net * net)246ddf97ccdSWANG Cong static __net_init int connmark_init_net(struct net *net)
247ddf97ccdSWANG Cong {
248acd0a7abSZhengchao Shao struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
249ddf97ccdSWANG Cong
250981471bdSCong Wang return tc_action_net_init(net, tn, &act_connmark_ops);
251ddf97ccdSWANG Cong }
252ddf97ccdSWANG Cong
connmark_exit_net(struct list_head * net_list)253039af9c6SCong Wang static void __net_exit connmark_exit_net(struct list_head *net_list)
254ddf97ccdSWANG Cong {
255acd0a7abSZhengchao Shao tc_action_net_exit(net_list, act_connmark_ops.net_id);
256ddf97ccdSWANG Cong }
257ddf97ccdSWANG Cong
258ddf97ccdSWANG Cong static struct pernet_operations connmark_net_ops = {
259ddf97ccdSWANG Cong .init = connmark_init_net,
260039af9c6SCong Wang .exit_batch = connmark_exit_net,
261acd0a7abSZhengchao Shao .id = &act_connmark_ops.net_id,
262ddf97ccdSWANG Cong .size = sizeof(struct tc_action_net),
26322a5dc0eSFelix Fietkau };
26422a5dc0eSFelix Fietkau
connmark_init_module(void)26522a5dc0eSFelix Fietkau static int __init connmark_init_module(void)
26622a5dc0eSFelix Fietkau {
267ddf97ccdSWANG Cong return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
26822a5dc0eSFelix Fietkau }
26922a5dc0eSFelix Fietkau
connmark_cleanup_module(void)27022a5dc0eSFelix Fietkau static void __exit connmark_cleanup_module(void)
27122a5dc0eSFelix Fietkau {
272ddf97ccdSWANG Cong tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
27322a5dc0eSFelix Fietkau }
27422a5dc0eSFelix Fietkau
27522a5dc0eSFelix Fietkau module_init(connmark_init_module);
27622a5dc0eSFelix Fietkau module_exit(connmark_cleanup_module);
27722a5dc0eSFelix Fietkau MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
27822a5dc0eSFelix Fietkau MODULE_DESCRIPTION("Connection tracking mark restoring");
27922a5dc0eSFelix Fietkau MODULE_LICENSE("GPL");
280