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 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); 39*288864efSPedro 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); 45*288864efSPedro Tammela tcf_action_update_bstats(&ca->common, skb); 46*288864efSPedro Tammela 47*288864efSPedro 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); 69*288864efSPedro Tammela goto count; 7022a5dc0eSFelix Fietkau } 7122a5dc0eSFelix Fietkau 72*288864efSPedro Tammela if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, parms->net, 73*288864efSPedro Tammela &tuple)) 7422a5dc0eSFelix Fietkau goto out; 7522a5dc0eSFelix Fietkau 76*288864efSPedro Tammela zone.id = parms->zone; 77deedb590SDaniel Borkmann zone.dir = NF_CT_DEFAULT_ZONE_DIR; 78308ac914SDaniel Borkmann 79*288864efSPedro 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 87*288864efSPedro Tammela count: 88*288864efSPedro Tammela /* using overlimits stats to count how many packets marked */ 89*288864efSPedro Tammela tcf_action_inc_overlimit_qstats(&ca->common); 9022a5dc0eSFelix Fietkau out: 91*288864efSPedro 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 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); 104*288864efSPedro 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 124*288864efSPedro Tammela nparms = kzalloc(sizeof(*nparms), GFP_KERNEL); 125*288864efSPedro Tammela if (!nparms) 126*288864efSPedro Tammela return -ENOMEM; 127*288864efSPedro 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) { 132*288864efSPedro Tammela ret = tcf_idr_create_from_flags(tn, index, est, a, 133*288864efSPedro Tammela &act_connmark_ops, bind, flags); 1340190c1d4SVlad Buslov if (ret) { 1357be8ef2cSDmytro Linkin tcf_idr_cleanup(tn, index); 136*288864efSPedro Tammela err = ret; 137*288864efSPedro Tammela goto out_free; 1380190c1d4SVlad Buslov } 13922a5dc0eSFelix Fietkau 140a85a970aSWANG Cong ci = to_connmark(*a); 141*288864efSPedro Tammela 142*288864efSPedro Tammela nparms->net = net; 143*288864efSPedro 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); 148*288864efSPedro Tammela if (bind) { 149*288864efSPedro Tammela err = 0; 150*288864efSPedro Tammela goto out_free; 1514e8ddd7fSVlad Buslov } 152*288864efSPedro Tammela if (!(flags & TCA_ACT_FLAGS_REPLACE)) { 153*288864efSPedro Tammela err = -EEXIST; 154c53075eaSDavide Caratti goto release_idr; 155*288864efSPedro Tammela } 156*288864efSPedro Tammela 157*288864efSPedro Tammela nparms->net = rtnl_dereference(ci->parms)->net; 158*288864efSPedro Tammela nparms->zone = parm->zone; 159*288864efSPedro Tammela 1600190c1d4SVlad Buslov ret = 0; 16122a5dc0eSFelix Fietkau } 16222a5dc0eSFelix Fietkau 163*288864efSPedro Tammela err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 164*288864efSPedro Tammela if (err < 0) 165*288864efSPedro Tammela goto release_idr; 166*288864efSPedro Tammela 167*288864efSPedro Tammela spin_lock_bh(&ci->tcf_lock); 168*288864efSPedro Tammela goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 169*288864efSPedro Tammela oparms = rcu_replace_pointer(ci->parms, nparms, lockdep_is_held(&ci->tcf_lock)); 170*288864efSPedro Tammela spin_unlock_bh(&ci->tcf_lock); 171*288864efSPedro Tammela 172*288864efSPedro Tammela if (goto_ch) 173*288864efSPedro Tammela tcf_chain_put_by_act(goto_ch); 174*288864efSPedro Tammela 175*288864efSPedro Tammela if (oparms) 176*288864efSPedro Tammela kfree_rcu(oparms, rcu); 177*288864efSPedro Tammela 17822a5dc0eSFelix Fietkau return ret; 179*288864efSPedro Tammela 180c53075eaSDavide Caratti release_idr: 181c53075eaSDavide Caratti tcf_idr_release(*a, bind); 182*288864efSPedro Tammela out_free: 183*288864efSPedro Tammela kfree(nparms); 184c53075eaSDavide Caratti return err; 18522a5dc0eSFelix Fietkau } 18622a5dc0eSFelix Fietkau 18722a5dc0eSFelix Fietkau static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, 18822a5dc0eSFelix Fietkau int bind, int ref) 18922a5dc0eSFelix Fietkau { 19022a5dc0eSFelix Fietkau unsigned char *b = skb_tail_pointer(skb); 191a85a970aSWANG Cong struct tcf_connmark_info *ci = to_connmark(a); 19222a5dc0eSFelix Fietkau struct tc_connmark opt = { 19322a5dc0eSFelix Fietkau .index = ci->tcf_index, 194036bb443SVlad Buslov .refcnt = refcount_read(&ci->tcf_refcnt) - ref, 195036bb443SVlad Buslov .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, 19622a5dc0eSFelix Fietkau }; 197*288864efSPedro Tammela struct tcf_connmark_parms *parms; 19822a5dc0eSFelix Fietkau struct tcf_t t; 19922a5dc0eSFelix Fietkau 200506a03aaSCong Wang spin_lock_bh(&ci->tcf_lock); 201*288864efSPedro Tammela parms = rcu_dereference_protected(ci->parms, lockdep_is_held(&ci->tcf_lock)); 202*288864efSPedro Tammela 203506a03aaSCong Wang opt.action = ci->tcf_action; 204*288864efSPedro Tammela opt.zone = parms->zone; 20522a5dc0eSFelix Fietkau if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) 20622a5dc0eSFelix Fietkau goto nla_put_failure; 20722a5dc0eSFelix Fietkau 20848d8ee16SJamal Hadi Salim tcf_tm_dump(&t, &ci->tcf_tm); 2099854518eSNicolas Dichtel if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, 2109854518eSNicolas Dichtel TCA_CONNMARK_PAD)) 21122a5dc0eSFelix Fietkau goto nla_put_failure; 212506a03aaSCong Wang spin_unlock_bh(&ci->tcf_lock); 21322a5dc0eSFelix Fietkau 21422a5dc0eSFelix Fietkau return skb->len; 215506a03aaSCong Wang 21622a5dc0eSFelix Fietkau nla_put_failure: 217506a03aaSCong Wang spin_unlock_bh(&ci->tcf_lock); 21822a5dc0eSFelix Fietkau nlmsg_trim(skb, b); 21922a5dc0eSFelix Fietkau return -1; 22022a5dc0eSFelix Fietkau } 22122a5dc0eSFelix Fietkau 222*288864efSPedro Tammela static void tcf_connmark_cleanup(struct tc_action *a) 223*288864efSPedro Tammela { 224*288864efSPedro Tammela struct tcf_connmark_info *ci = to_connmark(a); 225*288864efSPedro Tammela struct tcf_connmark_parms *parms; 226*288864efSPedro Tammela 227*288864efSPedro Tammela parms = rcu_dereference_protected(ci->parms, 1); 228*288864efSPedro Tammela if (parms) 229*288864efSPedro Tammela kfree_rcu(parms, rcu); 230*288864efSPedro Tammela } 231*288864efSPedro Tammela 23222a5dc0eSFelix Fietkau static struct tc_action_ops act_connmark_ops = { 23322a5dc0eSFelix Fietkau .kind = "connmark", 234eddd2cf1SEli Cohen .id = TCA_ID_CONNMARK, 23522a5dc0eSFelix Fietkau .owner = THIS_MODULE, 236962ad1f9SJamal Hadi Salim .act = tcf_connmark_act, 23722a5dc0eSFelix Fietkau .dump = tcf_connmark_dump, 23822a5dc0eSFelix Fietkau .init = tcf_connmark_init, 239*288864efSPedro Tammela .cleanup = tcf_connmark_cleanup, 240a85a970aSWANG Cong .size = sizeof(struct tcf_connmark_info), 241ddf97ccdSWANG Cong }; 242ddf97ccdSWANG Cong 243ddf97ccdSWANG Cong static __net_init int connmark_init_net(struct net *net) 244ddf97ccdSWANG Cong { 245acd0a7abSZhengchao Shao struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id); 246ddf97ccdSWANG Cong 247981471bdSCong Wang return tc_action_net_init(net, tn, &act_connmark_ops); 248ddf97ccdSWANG Cong } 249ddf97ccdSWANG Cong 250039af9c6SCong Wang static void __net_exit connmark_exit_net(struct list_head *net_list) 251ddf97ccdSWANG Cong { 252acd0a7abSZhengchao Shao tc_action_net_exit(net_list, act_connmark_ops.net_id); 253ddf97ccdSWANG Cong } 254ddf97ccdSWANG Cong 255ddf97ccdSWANG Cong static struct pernet_operations connmark_net_ops = { 256ddf97ccdSWANG Cong .init = connmark_init_net, 257039af9c6SCong Wang .exit_batch = connmark_exit_net, 258acd0a7abSZhengchao Shao .id = &act_connmark_ops.net_id, 259ddf97ccdSWANG Cong .size = sizeof(struct tc_action_net), 26022a5dc0eSFelix Fietkau }; 26122a5dc0eSFelix Fietkau 26222a5dc0eSFelix Fietkau static int __init connmark_init_module(void) 26322a5dc0eSFelix Fietkau { 264ddf97ccdSWANG Cong return tcf_register_action(&act_connmark_ops, &connmark_net_ops); 26522a5dc0eSFelix Fietkau } 26622a5dc0eSFelix Fietkau 26722a5dc0eSFelix Fietkau static void __exit connmark_cleanup_module(void) 26822a5dc0eSFelix Fietkau { 269ddf97ccdSWANG Cong tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); 27022a5dc0eSFelix Fietkau } 27122a5dc0eSFelix Fietkau 27222a5dc0eSFelix Fietkau module_init(connmark_init_module); 27322a5dc0eSFelix Fietkau module_exit(connmark_cleanup_module); 27422a5dc0eSFelix Fietkau MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); 27522a5dc0eSFelix Fietkau MODULE_DESCRIPTION("Connection tracking mark restoring"); 27622a5dc0eSFelix Fietkau MODULE_LICENSE("GPL"); 277