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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_connmark.c netfilter connmark retriever action
4 * skb mark is over-written
5 *
6 * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
7*/
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <linux/pkt_cls.h>
15#include <linux/ip.h>
16#include <linux/ipv6.h>
17#include <net/netlink.h>
18#include <net/pkt_sched.h>
19#include <net/act_api.h>
20#include <net/pkt_cls.h>
21#include <uapi/linux/tc_act/tc_connmark.h>
22#include <net/tc_act/tc_connmark.h>
23#include <net/tc_wrapper.h>
24
25#include <net/netfilter/nf_conntrack.h>
26#include <net/netfilter/nf_conntrack_core.h>
27#include <net/netfilter/nf_conntrack_zones.h>
28
29static struct tc_action_ops act_connmark_ops;
30
31TC_INDIRECT_SCOPE int tcf_connmark_act(struct sk_buff *skb,
32 const struct tc_action *a,
33 struct tcf_result *res)
34{
35 const struct nf_conntrack_tuple_hash *thash;
36 struct nf_conntrack_tuple tuple;
37 enum ip_conntrack_info ctinfo;
38 struct tcf_connmark_info *ca = to_connmark(a);
39 struct tcf_connmark_parms *parms;
40 struct nf_conntrack_zone zone;
41 struct nf_conn *c;
42 int proto;
43
44 tcf_lastuse_update(&ca->tcf_tm);
45 tcf_action_update_bstats(&ca->common, skb);
46
47 parms = rcu_dereference_bh(ca->parms);
48
49 switch (skb_protocol(skb, true)) {
50 case htons(ETH_P_IP):
51 if (skb->len < sizeof(struct iphdr))
52 goto out;
53
54 proto = NFPROTO_IPV4;
55 break;
56 case htons(ETH_P_IPV6):
57 if (skb->len < sizeof(struct ipv6hdr))
58 goto out;
59
60 proto = NFPROTO_IPV6;
61 break;
62 default:
63 goto out;
64 }
65
66 c = nf_ct_get(skb, &ctinfo);
67 if (c) {
68 skb->mark = READ_ONCE(c->mark);
69 goto count;
70 }
71
72 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, parms->net,
73 &tuple))
74 goto out;
75
76 zone.id = parms->zone;
77 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
78
79 thash = nf_conntrack_find_get(parms->net, &zone, &tuple);
80 if (!thash)
81 goto out;
82
83 c = nf_ct_tuplehash_to_ctrack(thash);
84 skb->mark = READ_ONCE(c->mark);
85 nf_ct_put(c);
86
87count:
88 /* using overlimits stats to count how many packets marked */
89 tcf_action_inc_overlimit_qstats(&ca->common);
90out:
91 return READ_ONCE(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 struct tcf_proto *tp, u32 flags,
101 struct netlink_ext_ack *extack)
102{
103 struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
104 struct tcf_connmark_parms *nparms, *oparms;
105 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
106 bool bind = flags & TCA_ACT_FLAGS_BIND;
107 struct tcf_chain *goto_ch = NULL;
108 struct tcf_connmark_info *ci;
109 struct tc_connmark *parm;
110 int ret = 0, err;
111 u32 index;
112
113 if (!nla)
114 return -EINVAL;
115
116 ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
117 connmark_policy, NULL);
118 if (ret < 0)
119 return ret;
120
121 if (!tb[TCA_CONNMARK_PARMS])
122 return -EINVAL;
123
124 nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
125 if (!nparms)
126 return -ENOMEM;
127
128 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
129 index = parm->index;
130 ret = tcf_idr_check_alloc(tn, &index, a, bind);
131 if (!ret) {
132 ret = tcf_idr_create_from_flags(tn, index, est, a,
133 &act_connmark_ops, bind, flags);
134 if (ret) {
135 tcf_idr_cleanup(tn, index);
136 err = ret;
137 goto out_free;
138 }
139
140 ci = to_connmark(*a);
141
142 nparms->net = net;
143 nparms->zone = parm->zone;
144
145 ret = ACT_P_CREATED;
146 } else if (ret > 0) {
147 ci = to_connmark(*a);
148 if (bind) {
149 err = ACT_P_BOUND;
150 goto out_free;
151 }
152 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
153 err = -EEXIST;
154 goto release_idr;
155 }
156
157 nparms->net = rtnl_dereference(ci->parms)->net;
158 nparms->zone = parm->zone;
159
160 ret = 0;
161 } else {
162 err = ret;
163 goto out_free;
164 }
165
166 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
167 if (err < 0)
168 goto release_idr;
169
170 spin_lock_bh(&ci->tcf_lock);
171 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
172 oparms = rcu_replace_pointer(ci->parms, nparms, lockdep_is_held(&ci->tcf_lock));
173 spin_unlock_bh(&ci->tcf_lock);
174
175 if (goto_ch)
176 tcf_chain_put_by_act(goto_ch);
177
178 if (oparms)
179 kfree_rcu(oparms, rcu);
180
181 return ret;
182
183release_idr:
184 tcf_idr_release(*a, bind);
185out_free:
186 kfree(nparms);
187 return err;
188}
189
190static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
191 int bind, int ref)
192{
193 unsigned char *b = skb_tail_pointer(skb);
194 struct tcf_connmark_info *ci = to_connmark(a);
195 struct tc_connmark opt = {
196 .index = ci->tcf_index,
197 .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
198 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
199 };
200 struct tcf_connmark_parms *parms;
201 struct tcf_t t;
202
203 spin_lock_bh(&ci->tcf_lock);
204 parms = rcu_dereference_protected(ci->parms, lockdep_is_held(&ci->tcf_lock));
205
206 opt.action = ci->tcf_action;
207 opt.zone = parms->zone;
208 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
209 goto nla_put_failure;
210
211 tcf_tm_dump(&t, &ci->tcf_tm);
212 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
213 TCA_CONNMARK_PAD))
214 goto nla_put_failure;
215 spin_unlock_bh(&ci->tcf_lock);
216
217 return skb->len;
218
219nla_put_failure:
220 spin_unlock_bh(&ci->tcf_lock);
221 nlmsg_trim(skb, b);
222 return -1;
223}
224
225static void tcf_connmark_cleanup(struct tc_action *a)
226{
227 struct tcf_connmark_info *ci = to_connmark(a);
228 struct tcf_connmark_parms *parms;
229
230 parms = rcu_dereference_protected(ci->parms, 1);
231 if (parms)
232 kfree_rcu(parms, rcu);
233}
234
235static struct tc_action_ops act_connmark_ops = {
236 .kind = "connmark",
237 .id = TCA_ID_CONNMARK,
238 .owner = THIS_MODULE,
239 .act = tcf_connmark_act,
240 .dump = tcf_connmark_dump,
241 .init = tcf_connmark_init,
242 .cleanup = tcf_connmark_cleanup,
243 .size = sizeof(struct tcf_connmark_info),
244};
245
246static __net_init int connmark_init_net(struct net *net)
247{
248 struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
249
250 return tc_action_net_init(net, tn, &act_connmark_ops);
251}
252
253static void __net_exit connmark_exit_net(struct list_head *net_list)
254{
255 tc_action_net_exit(net_list, act_connmark_ops.net_id);
256}
257
258static struct pernet_operations connmark_net_ops = {
259 .init = connmark_init_net,
260 .exit_batch = connmark_exit_net,
261 .id = &act_connmark_ops.net_id,
262 .size = sizeof(struct tc_action_net),
263};
264
265static int __init connmark_init_module(void)
266{
267 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
268}
269
270static void __exit connmark_cleanup_module(void)
271{
272 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
273}
274
275module_init(connmark_init_module);
276module_exit(connmark_cleanup_module);
277MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
278MODULE_DESCRIPTION("Connection tracking mark restoring");
279MODULE_LICENSE("GPL");