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 tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
36 const struct nf_conntrack_tuple_hash *thash;
37 struct nf_conntrack_tuple tuple;
38 enum ip_conntrack_info ctinfo;
39 struct tcf_connmark_info *ca = a->priv;
43 spin_lock(&ca->tcf_lock);
44 ca->tcf_tm.lastuse = jiffies;
45 bstats_update(&ca->tcf_bstats, skb);
47 if (skb->protocol == htons(ETH_P_IP)) {
48 if (skb->len < sizeof(struct iphdr))
52 } else if (skb->protocol == htons(ETH_P_IPV6)) {
53 if (skb->len < sizeof(struct ipv6hdr))
61 c = nf_ct_get(skb, &ctinfo);
64 /* using overlimits stats to count how many packets marked */
65 ca->tcf_qstats.overlimits++;
69 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
73 thash = nf_conntrack_find_get(dev_net(skb->dev), ca->zone, &tuple);
77 c = nf_ct_tuplehash_to_ctrack(thash);
78 /* using overlimits stats to count how many packets marked */
79 ca->tcf_qstats.overlimits++;
84 spin_unlock(&ca->tcf_lock);
85 return ca->tcf_action;
88 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
89 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
92 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
93 struct nlattr *est, struct tc_action *a,
96 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
97 struct tcf_connmark_info *ci;
98 struct tc_connmark *parm;
104 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
108 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
110 if (!tcf_hash_check(parm->index, a, bind)) {
111 ret = tcf_hash_create(parm->index, est, a, sizeof(*ci), bind);
116 ci->tcf_action = parm->action;
117 ci->zone = parm->zone;
125 tcf_hash_release(a, bind);
128 /* replacing action and zone */
129 ci->tcf_action = parm->action;
130 ci->zone = parm->zone;
136 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
139 unsigned char *b = skb_tail_pointer(skb);
140 struct tcf_connmark_info *ci = a->priv;
142 struct tc_connmark opt = {
143 .index = ci->tcf_index,
144 .refcnt = ci->tcf_refcnt - ref,
145 .bindcnt = ci->tcf_bindcnt - bind,
146 .action = ci->tcf_action,
151 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
152 goto nla_put_failure;
154 t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install);
155 t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse);
156 t.expires = jiffies_to_clock_t(ci->tcf_tm.expires);
157 if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t))
158 goto nla_put_failure;
166 static struct tc_action_ops act_connmark_ops = {
168 .type = TCA_ACT_CONNMARK,
169 .owner = THIS_MODULE,
171 .dump = tcf_connmark_dump,
172 .init = tcf_connmark_init,
175 static int __init connmark_init_module(void)
177 return tcf_register_action(&act_connmark_ops, CONNMARK_TAB_MASK);
180 static void __exit connmark_cleanup_module(void)
182 tcf_unregister_action(&act_connmark_ops);
185 module_init(connmark_init_module);
186 module_exit(connmark_cleanup_module);
187 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
188 MODULE_DESCRIPTION("Connection tracking mark restoring");
189 MODULE_LICENSE("GPL");