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 static unsigned int connmark_net_id;
32 static struct tc_action_ops act_connmark_ops;
34 static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
35 struct tcf_result *res)
37 const struct nf_conntrack_tuple_hash *thash;
38 struct nf_conntrack_tuple tuple;
39 enum ip_conntrack_info ctinfo;
40 struct tcf_connmark_info *ca = to_connmark(a);
41 struct nf_conntrack_zone zone;
45 spin_lock(&ca->tcf_lock);
46 tcf_lastuse_update(&ca->tcf_tm);
47 bstats_update(&ca->tcf_bstats, skb);
49 if (skb->protocol == htons(ETH_P_IP)) {
50 if (skb->len < sizeof(struct iphdr))
54 } else if (skb->protocol == htons(ETH_P_IPV6)) {
55 if (skb->len < sizeof(struct ipv6hdr))
63 c = nf_ct_get(skb, &ctinfo);
66 /* using overlimits stats to count how many packets marked */
67 ca->tcf_qstats.overlimits++;
71 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
72 proto, ca->net, &tuple))
76 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
78 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
82 c = nf_ct_tuplehash_to_ctrack(thash);
83 /* using overlimits stats to count how many packets marked */
84 ca->tcf_qstats.overlimits++;
89 spin_unlock(&ca->tcf_lock);
90 return ca->tcf_action;
93 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
94 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
97 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
98 struct nlattr *est, struct tc_action **a,
99 int ovr, int bind, bool rtnl_held,
100 struct netlink_ext_ack *extack)
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,
116 if (!tb[TCA_CONNMARK_PARMS])
119 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
121 ret = tcf_idr_check_alloc(tn, &parm->index, a, bind);
123 ret = tcf_idr_create(tn, parm->index, est, a,
124 &act_connmark_ops, bind, false);
126 tcf_idr_cleanup(tn, parm->index);
130 ci = to_connmark(*a);
131 ci->tcf_action = parm->action;
133 ci->zone = parm->zone;
135 tcf_idr_insert(tn, *a);
137 } else if (ret > 0) {
138 ci = to_connmark(*a);
142 tcf_idr_release(*a, bind);
145 /* replacing action and zone */
146 ci->tcf_action = parm->action;
147 ci->zone = parm->zone;
154 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
157 unsigned char *b = skb_tail_pointer(skb);
158 struct tcf_connmark_info *ci = to_connmark(a);
160 struct tc_connmark opt = {
161 .index = ci->tcf_index,
162 .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
163 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
164 .action = ci->tcf_action,
169 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
170 goto nla_put_failure;
172 tcf_tm_dump(&t, &ci->tcf_tm);
173 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
175 goto nla_put_failure;
183 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
184 struct netlink_callback *cb, int type,
185 const struct tc_action_ops *ops,
186 struct netlink_ext_ack *extack)
188 struct tc_action_net *tn = net_generic(net, connmark_net_id);
190 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
193 static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index,
194 struct netlink_ext_ack *extack)
196 struct tc_action_net *tn = net_generic(net, connmark_net_id);
198 return tcf_idr_search(tn, a, index);
201 static int tcf_connmark_delete(struct net *net, u32 index)
203 struct tc_action_net *tn = net_generic(net, connmark_net_id);
205 return tcf_idr_delete_index(tn, index);
208 static struct tc_action_ops act_connmark_ops = {
210 .type = TCA_ACT_CONNMARK,
211 .owner = THIS_MODULE,
212 .act = tcf_connmark_act,
213 .dump = tcf_connmark_dump,
214 .init = tcf_connmark_init,
215 .walk = tcf_connmark_walker,
216 .lookup = tcf_connmark_search,
217 .delete = tcf_connmark_delete,
218 .size = sizeof(struct tcf_connmark_info),
221 static __net_init int connmark_init_net(struct net *net)
223 struct tc_action_net *tn = net_generic(net, connmark_net_id);
225 return tc_action_net_init(tn, &act_connmark_ops);
228 static void __net_exit connmark_exit_net(struct list_head *net_list)
230 tc_action_net_exit(net_list, connmark_net_id);
233 static struct pernet_operations connmark_net_ops = {
234 .init = connmark_init_net,
235 .exit_batch = connmark_exit_net,
236 .id = &connmark_net_id,
237 .size = sizeof(struct tc_action_net),
240 static int __init connmark_init_module(void)
242 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
245 static void __exit connmark_cleanup_module(void)
247 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
250 module_init(connmark_init_module);
251 module_exit(connmark_cleanup_module);
252 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
253 MODULE_DESCRIPTION("Connection tracking mark restoring");
254 MODULE_LICENSE("GPL");