blob: 5019a47b9270e758f65c346631becc99e933b0c6 [file] [log] [blame]
Felix Fietkau22a5dc02015-01-18 16:35:14 -05001/*
2 * net/sched/act_connmark.c netfilter connmark retriever action
3 * skb mark is over-written
4 *
5 * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
6 *
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.
11*/
12
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>
19#include <linux/ip.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>
26
27#include <net/netfilter/nf_conntrack.h>
28#include <net/netfilter/nf_conntrack_core.h>
29#include <net/netfilter/nf_conntrack_zones.h>
30
31#define CONNMARK_TAB_MASK 3
32
33static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
35{
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;
Daniel Borkmann308ac912015-08-08 21:40:01 +020040 struct nf_conntrack_zone zone;
Felix Fietkau22a5dc02015-01-18 16:35:14 -050041 struct nf_conn *c;
42 int proto;
43
44 spin_lock(&ca->tcf_lock);
45 ca->tcf_tm.lastuse = jiffies;
46 bstats_update(&ca->tcf_bstats, skb);
47
48 if (skb->protocol == htons(ETH_P_IP)) {
49 if (skb->len < sizeof(struct iphdr))
50 goto out;
51
52 proto = NFPROTO_IPV4;
53 } else if (skb->protocol == htons(ETH_P_IPV6)) {
54 if (skb->len < sizeof(struct ipv6hdr))
55 goto out;
56
57 proto = NFPROTO_IPV6;
58 } else {
59 goto out;
60 }
61
62 c = nf_ct_get(skb, &ctinfo);
63 if (c) {
64 skb->mark = c->mark;
65 /* using overlimits stats to count how many packets marked */
66 ca->tcf_qstats.overlimits++;
Felix Fietkau22a5dc02015-01-18 16:35:14 -050067 goto out;
68 }
69
70 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
71 proto, &tuple))
72 goto out;
73
Daniel Borkmann308ac912015-08-08 21:40:01 +020074 zone.id = ca->zone;
Daniel Borkmanndeedb592015-08-14 16:03:39 +020075 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
Daniel Borkmann308ac912015-08-08 21:40:01 +020076
77 thash = nf_conntrack_find_get(dev_net(skb->dev), &zone, &tuple);
Felix Fietkau22a5dc02015-01-18 16:35:14 -050078 if (!thash)
79 goto out;
80
81 c = nf_ct_tuplehash_to_ctrack(thash);
82 /* using overlimits stats to count how many packets marked */
83 ca->tcf_qstats.overlimits++;
84 skb->mark = c->mark;
85 nf_ct_put(c);
86
87out:
Felix Fietkau22a5dc02015-01-18 16:35:14 -050088 spin_unlock(&ca->tcf_lock);
89 return ca->tcf_action;
90}
91
92static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
93 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
94};
95
96static int tcf_connmark_init(struct net *net, struct nlattr *nla,
97 struct nlattr *est, struct tc_action *a,
98 int ovr, int bind)
99{
100 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
101 struct tcf_connmark_info *ci;
102 struct tc_connmark *parm;
103 int ret = 0;
104
105 if (!nla)
106 return -EINVAL;
107
108 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
109 if (ret < 0)
110 return ret;
111
112 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
113
114 if (!tcf_hash_check(parm->index, a, bind)) {
Eric Dumazet519c8182015-07-06 05:18:04 -0700115 ret = tcf_hash_create(parm->index, est, a, sizeof(*ci),
116 bind, false);
Felix Fietkau22a5dc02015-01-18 16:35:14 -0500117 if (ret)
118 return ret;
119
120 ci = to_connmark(a);
121 ci->tcf_action = parm->action;
122 ci->zone = parm->zone;
123
124 tcf_hash_insert(a);
125 ret = ACT_P_CREATED;
126 } else {
127 ci = to_connmark(a);
128 if (bind)
129 return 0;
130 tcf_hash_release(a, bind);
131 if (!ovr)
132 return -EEXIST;
133 /* replacing action and zone */
134 ci->tcf_action = parm->action;
135 ci->zone = parm->zone;
136 }
137
138 return ret;
139}
140
141static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
142 int bind, int ref)
143{
144 unsigned char *b = skb_tail_pointer(skb);
145 struct tcf_connmark_info *ci = a->priv;
146
147 struct tc_connmark opt = {
148 .index = ci->tcf_index,
149 .refcnt = ci->tcf_refcnt - ref,
150 .bindcnt = ci->tcf_bindcnt - bind,
151 .action = ci->tcf_action,
152 .zone = ci->zone,
153 };
154 struct tcf_t t;
155
156 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
157 goto nla_put_failure;
158
159 t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install);
160 t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse);
161 t.expires = jiffies_to_clock_t(ci->tcf_tm.expires);
162 if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t))
163 goto nla_put_failure;
164
165 return skb->len;
166nla_put_failure:
167 nlmsg_trim(skb, b);
168 return -1;
169}
170
171static struct tc_action_ops act_connmark_ops = {
172 .kind = "connmark",
173 .type = TCA_ACT_CONNMARK,
174 .owner = THIS_MODULE,
175 .act = tcf_connmark,
176 .dump = tcf_connmark_dump,
177 .init = tcf_connmark_init,
178};
179
180static int __init connmark_init_module(void)
181{
182 return tcf_register_action(&act_connmark_ops, CONNMARK_TAB_MASK);
183}
184
185static void __exit connmark_cleanup_module(void)
186{
187 tcf_unregister_action(&act_connmark_ops);
188}
189
190module_init(connmark_init_module);
191module_exit(connmark_cleanup_module);
192MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
193MODULE_DESCRIPTION("Connection tracking mark restoring");
194MODULE_LICENSE("GPL");
195