2 * net/sched/act_connmark.c netfilter connmark retriever action
3 * skb mark is over-written
5 * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/skbuff.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/pkt_cls.h>
20 #include <linux/ipv6.h>
21 #include <net/netlink.h>
22 #include <net/pkt_sched.h>
23 #include <net/act_api.h>
24 #include <uapi/linux/tc_act/tc_connmark.h>
25 #include <net/tc_act/tc_connmark.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_zones.h>
31 #define CONNMARK_TAB_MASK 3
33 static int connmark_net_id;
35 static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
36 struct tcf_result *res)
38 const struct nf_conntrack_tuple_hash *thash;
39 struct nf_conntrack_tuple tuple;
40 enum ip_conntrack_info ctinfo;
41 struct tcf_connmark_info *ca = a->priv;
42 struct nf_conntrack_zone zone;
46 spin_lock(&ca->tcf_lock);
47 ca->tcf_tm.lastuse = jiffies;
48 bstats_update(&ca->tcf_bstats, skb);
50 if (skb->protocol == htons(ETH_P_IP)) {
51 if (skb->len < sizeof(struct iphdr))
55 } else if (skb->protocol == htons(ETH_P_IPV6)) {
56 if (skb->len < sizeof(struct ipv6hdr))
64 c = nf_ct_get(skb, &ctinfo);
67 /* using overlimits stats to count how many packets marked */
68 ca->tcf_qstats.overlimits++;
72 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
73 proto, ca->net, &tuple))
77 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
79 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
83 c = nf_ct_tuplehash_to_ctrack(thash);
84 /* using overlimits stats to count how many packets marked */
85 ca->tcf_qstats.overlimits++;
90 spin_unlock(&ca->tcf_lock);
91 return ca->tcf_action;
94 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
95 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
98 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
99 struct nlattr *est, struct tc_action *a,
102 struct tc_action_net *tn = net_generic(net, connmark_net_id);
103 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
104 struct tcf_connmark_info *ci;
105 struct tc_connmark *parm;
111 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
115 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
117 if (!tcf_hash_check(tn, parm->index, a, bind)) {
118 ret = tcf_hash_create(tn, parm->index, est, a,
119 sizeof(*ci), bind, false);
124 ci->tcf_action = parm->action;
126 ci->zone = parm->zone;
128 tcf_hash_insert(tn, a);
134 tcf_hash_release(a, bind);
137 /* replacing action and zone */
138 ci->tcf_action = parm->action;
139 ci->zone = parm->zone;
145 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
148 unsigned char *b = skb_tail_pointer(skb);
149 struct tcf_connmark_info *ci = a->priv;
151 struct tc_connmark opt = {
152 .index = ci->tcf_index,
153 .refcnt = ci->tcf_refcnt - ref,
154 .bindcnt = ci->tcf_bindcnt - bind,
155 .action = ci->tcf_action,
160 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
161 goto nla_put_failure;
163 t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install);
164 t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse);
165 t.expires = jiffies_to_clock_t(ci->tcf_tm.expires);
166 if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t))
167 goto nla_put_failure;
175 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
176 struct netlink_callback *cb, int type,
179 struct tc_action_net *tn = net_generic(net, connmark_net_id);
181 return tcf_generic_walker(tn, skb, cb, type, a);
184 static int tcf_connmark_search(struct net *net, struct tc_action *a, u32 index)
186 struct tc_action_net *tn = net_generic(net, connmark_net_id);
188 return tcf_hash_search(tn, a, index);
191 static struct tc_action_ops act_connmark_ops = {
193 .type = TCA_ACT_CONNMARK,
194 .owner = THIS_MODULE,
196 .dump = tcf_connmark_dump,
197 .init = tcf_connmark_init,
198 .walk = tcf_connmark_walker,
199 .lookup = tcf_connmark_search,
202 static __net_init int connmark_init_net(struct net *net)
204 struct tc_action_net *tn = net_generic(net, connmark_net_id);
206 return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK);
209 static void __net_exit connmark_exit_net(struct net *net)
211 struct tc_action_net *tn = net_generic(net, connmark_net_id);
213 tc_action_net_exit(tn);
216 static struct pernet_operations connmark_net_ops = {
217 .init = connmark_init_net,
218 .exit = connmark_exit_net,
219 .id = &connmark_net_id,
220 .size = sizeof(struct tc_action_net),
223 static int __init connmark_init_module(void)
225 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
228 static void __exit connmark_cleanup_module(void)
230 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
233 module_init(connmark_init_module);
234 module_exit(connmark_cleanup_module);
235 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
236 MODULE_DESCRIPTION("Connection tracking mark restoring");
237 MODULE_LICENSE("GPL");