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1/*
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
31static unsigned int connmark_net_id;
32static struct tc_action_ops act_connmark_ops;
33
34static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
35 struct tcf_result *res)
36{
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;
42 struct nf_conn *c;
43 int proto;
44
45 spin_lock(&ca->tcf_lock);
46 tcf_lastuse_update(&ca->tcf_tm);
47 bstats_update(&ca->tcf_bstats, skb);
48
49 if (skb->protocol == htons(ETH_P_IP)) {
50 if (skb->len < sizeof(struct iphdr))
51 goto out;
52
53 proto = NFPROTO_IPV4;
54 } else if (skb->protocol == htons(ETH_P_IPV6)) {
55 if (skb->len < sizeof(struct ipv6hdr))
56 goto out;
57
58 proto = NFPROTO_IPV6;
59 } else {
60 goto out;
61 }
62
63 c = nf_ct_get(skb, &ctinfo);
64 if (c) {
65 skb->mark = c->mark;
66 /* using overlimits stats to count how many packets marked */
67 ca->tcf_qstats.overlimits++;
68 goto out;
69 }
70
71 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
72 proto, ca->net, &tuple))
73 goto out;
74
75 zone.id = ca->zone;
76 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
77
78 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
79 if (!thash)
80 goto out;
81
82 c = nf_ct_tuplehash_to_ctrack(thash);
83 /* using overlimits stats to count how many packets marked */
84 ca->tcf_qstats.overlimits++;
85 skb->mark = c->mark;
86 nf_ct_put(c);
87
88out:
89 spin_unlock(&ca->tcf_lock);
90 return ca->tcf_action;
91}
92
93static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
94 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
95};
96
97static int tcf_connmark_init(struct net *net, struct nlattr *nla,
98 struct nlattr *est, struct tc_action **a,
99 int ovr, int bind,
100 struct netlink_ext_ack *extack)
101{
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;
106 int ret = 0;
107
108 if (!nla)
109 return -EINVAL;
110
111 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy,
112 NULL);
113 if (ret < 0)
114 return ret;
115
116 if (!tb[TCA_CONNMARK_PARMS])
117 return -EINVAL;
118
119 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
120
121 if (!tcf_idr_check(tn, parm->index, a, bind)) {
122 ret = tcf_idr_create(tn, parm->index, est, a,
123 &act_connmark_ops, bind, false);
124 if (ret)
125 return ret;
126
127 ci = to_connmark(*a);
128 ci->tcf_action = parm->action;
129 ci->net = net;
130 ci->zone = parm->zone;
131
132 tcf_idr_insert(tn, *a);
133 ret = ACT_P_CREATED;
134 } else {
135 ci = to_connmark(*a);
136 if (bind)
137 return 0;
138 tcf_idr_release(*a, bind);
139 if (!ovr)
140 return -EEXIST;
141 /* replacing action and zone */
142 ci->tcf_action = parm->action;
143 ci->zone = parm->zone;
144 }
145
146 return ret;
147}
148
149static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
150 int bind, int ref)
151{
152 unsigned char *b = skb_tail_pointer(skb);
153 struct tcf_connmark_info *ci = to_connmark(a);
154
155 struct tc_connmark opt = {
156 .index = ci->tcf_index,
157 .refcnt = ci->tcf_refcnt - ref,
158 .bindcnt = ci->tcf_bindcnt - bind,
159 .action = ci->tcf_action,
160 .zone = ci->zone,
161 };
162 struct tcf_t t;
163
164 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
165 goto nla_put_failure;
166
167 tcf_tm_dump(&t, &ci->tcf_tm);
168 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
169 TCA_CONNMARK_PAD))
170 goto nla_put_failure;
171
172 return skb->len;
173nla_put_failure:
174 nlmsg_trim(skb, b);
175 return -1;
176}
177
178static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
179 struct netlink_callback *cb, int type,
180 const struct tc_action_ops *ops,
181 struct netlink_ext_ack *extack)
182{
183 struct tc_action_net *tn = net_generic(net, connmark_net_id);
184
185 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
186}
187
188static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index,
189 struct netlink_ext_ack *extack)
190{
191 struct tc_action_net *tn = net_generic(net, connmark_net_id);
192
193 return tcf_idr_search(tn, a, index);
194}
195
196static struct tc_action_ops act_connmark_ops = {
197 .kind = "connmark",
198 .type = TCA_ACT_CONNMARK,
199 .owner = THIS_MODULE,
200 .act = tcf_connmark,
201 .dump = tcf_connmark_dump,
202 .init = tcf_connmark_init,
203 .walk = tcf_connmark_walker,
204 .lookup = tcf_connmark_search,
205 .size = sizeof(struct tcf_connmark_info),
206};
207
208static __net_init int connmark_init_net(struct net *net)
209{
210 struct tc_action_net *tn = net_generic(net, connmark_net_id);
211
212 return tc_action_net_init(tn, &act_connmark_ops);
213}
214
215static void __net_exit connmark_exit_net(struct list_head *net_list)
216{
217 tc_action_net_exit(net_list, connmark_net_id);
218}
219
220static struct pernet_operations connmark_net_ops = {
221 .init = connmark_init_net,
222 .exit_batch = connmark_exit_net,
223 .id = &connmark_net_id,
224 .size = sizeof(struct tc_action_net),
225};
226
227static int __init connmark_init_module(void)
228{
229 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
230}
231
232static void __exit connmark_cleanup_module(void)
233{
234 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
235}
236
237module_init(connmark_init_module);
238module_exit(connmark_cleanup_module);
239MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
240MODULE_DESCRIPTION("Connection tracking mark restoring");
241MODULE_LICENSE("GPL");
242
1/*
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 connmark_net_id;
34
35static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
36 struct tcf_result *res)
37{
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;
43 struct nf_conn *c;
44 int proto;
45
46 spin_lock(&ca->tcf_lock);
47 ca->tcf_tm.lastuse = jiffies;
48 bstats_update(&ca->tcf_bstats, skb);
49
50 if (skb->protocol == htons(ETH_P_IP)) {
51 if (skb->len < sizeof(struct iphdr))
52 goto out;
53
54 proto = NFPROTO_IPV4;
55 } else if (skb->protocol == htons(ETH_P_IPV6)) {
56 if (skb->len < sizeof(struct ipv6hdr))
57 goto out;
58
59 proto = NFPROTO_IPV6;
60 } else {
61 goto out;
62 }
63
64 c = nf_ct_get(skb, &ctinfo);
65 if (c) {
66 skb->mark = c->mark;
67 /* using overlimits stats to count how many packets marked */
68 ca->tcf_qstats.overlimits++;
69 goto out;
70 }
71
72 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
73 proto, ca->net, &tuple))
74 goto out;
75
76 zone.id = ca->zone;
77 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
78
79 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
80 if (!thash)
81 goto out;
82
83 c = nf_ct_tuplehash_to_ctrack(thash);
84 /* using overlimits stats to count how many packets marked */
85 ca->tcf_qstats.overlimits++;
86 skb->mark = c->mark;
87 nf_ct_put(c);
88
89out:
90 spin_unlock(&ca->tcf_lock);
91 return ca->tcf_action;
92}
93
94static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
95 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
96};
97
98static int tcf_connmark_init(struct net *net, struct nlattr *nla,
99 struct nlattr *est, struct tc_action *a,
100 int ovr, int bind)
101{
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;
106 int ret = 0;
107
108 if (!nla)
109 return -EINVAL;
110
111 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
112 if (ret < 0)
113 return ret;
114
115 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
116
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);
120 if (ret)
121 return ret;
122
123 ci = to_connmark(a);
124 ci->tcf_action = parm->action;
125 ci->net = net;
126 ci->zone = parm->zone;
127
128 tcf_hash_insert(tn, a);
129 ret = ACT_P_CREATED;
130 } else {
131 ci = to_connmark(a);
132 if (bind)
133 return 0;
134 tcf_hash_release(a, bind);
135 if (!ovr)
136 return -EEXIST;
137 /* replacing action and zone */
138 ci->tcf_action = parm->action;
139 ci->zone = parm->zone;
140 }
141
142 return ret;
143}
144
145static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
146 int bind, int ref)
147{
148 unsigned char *b = skb_tail_pointer(skb);
149 struct tcf_connmark_info *ci = a->priv;
150
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,
156 .zone = ci->zone,
157 };
158 struct tcf_t t;
159
160 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
161 goto nla_put_failure;
162
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;
168
169 return skb->len;
170nla_put_failure:
171 nlmsg_trim(skb, b);
172 return -1;
173}
174
175static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
176 struct netlink_callback *cb, int type,
177 struct tc_action *a)
178{
179 struct tc_action_net *tn = net_generic(net, connmark_net_id);
180
181 return tcf_generic_walker(tn, skb, cb, type, a);
182}
183
184static int tcf_connmark_search(struct net *net, struct tc_action *a, u32 index)
185{
186 struct tc_action_net *tn = net_generic(net, connmark_net_id);
187
188 return tcf_hash_search(tn, a, index);
189}
190
191static struct tc_action_ops act_connmark_ops = {
192 .kind = "connmark",
193 .type = TCA_ACT_CONNMARK,
194 .owner = THIS_MODULE,
195 .act = tcf_connmark,
196 .dump = tcf_connmark_dump,
197 .init = tcf_connmark_init,
198 .walk = tcf_connmark_walker,
199 .lookup = tcf_connmark_search,
200};
201
202static __net_init int connmark_init_net(struct net *net)
203{
204 struct tc_action_net *tn = net_generic(net, connmark_net_id);
205
206 return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK);
207}
208
209static void __net_exit connmark_exit_net(struct net *net)
210{
211 struct tc_action_net *tn = net_generic(net, connmark_net_id);
212
213 tc_action_net_exit(tn);
214}
215
216static 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),
221};
222
223static int __init connmark_init_module(void)
224{
225 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
226}
227
228static void __exit connmark_cleanup_module(void)
229{
230 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
231}
232
233module_init(connmark_init_module);
234module_exit(connmark_cleanup_module);
235MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
236MODULE_DESCRIPTION("Connection tracking mark restoring");
237MODULE_LICENSE("GPL");
238