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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
24#include <net/netfilter/nf_conntrack.h>
25#include <net/netfilter/nf_conntrack_core.h>
26#include <net/netfilter/nf_conntrack_zones.h>
27
28static unsigned int connmark_net_id;
29static struct tc_action_ops act_connmark_ops;
30
31static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
32 struct tcf_result *res)
33{
34 const struct nf_conntrack_tuple_hash *thash;
35 struct nf_conntrack_tuple tuple;
36 enum ip_conntrack_info ctinfo;
37 struct tcf_connmark_info *ca = to_connmark(a);
38 struct nf_conntrack_zone zone;
39 struct nf_conn *c;
40 int proto;
41
42 spin_lock(&ca->tcf_lock);
43 tcf_lastuse_update(&ca->tcf_tm);
44 bstats_update(&ca->tcf_bstats, skb);
45
46 if (skb->protocol == htons(ETH_P_IP)) {
47 if (skb->len < sizeof(struct iphdr))
48 goto out;
49
50 proto = NFPROTO_IPV4;
51 } else if (skb->protocol == htons(ETH_P_IPV6)) {
52 if (skb->len < sizeof(struct ipv6hdr))
53 goto out;
54
55 proto = NFPROTO_IPV6;
56 } else {
57 goto out;
58 }
59
60 c = nf_ct_get(skb, &ctinfo);
61 if (c) {
62 skb->mark = c->mark;
63 /* using overlimits stats to count how many packets marked */
64 ca->tcf_qstats.overlimits++;
65 goto out;
66 }
67
68 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
69 proto, ca->net, &tuple))
70 goto out;
71
72 zone.id = ca->zone;
73 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
74
75 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
76 if (!thash)
77 goto out;
78
79 c = nf_ct_tuplehash_to_ctrack(thash);
80 /* using overlimits stats to count how many packets marked */
81 ca->tcf_qstats.overlimits++;
82 skb->mark = c->mark;
83 nf_ct_put(c);
84
85out:
86 spin_unlock(&ca->tcf_lock);
87 return ca->tcf_action;
88}
89
90static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
91 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
92};
93
94static int tcf_connmark_init(struct net *net, struct nlattr *nla,
95 struct nlattr *est, struct tc_action **a,
96 int ovr, int bind, bool rtnl_held,
97 struct tcf_proto *tp,
98 struct netlink_ext_ack *extack)
99{
100 struct tc_action_net *tn = net_generic(net, connmark_net_id);
101 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
102 struct tcf_chain *goto_ch = NULL;
103 struct tcf_connmark_info *ci;
104 struct tc_connmark *parm;
105 int ret = 0, err;
106 u32 index;
107
108 if (!nla)
109 return -EINVAL;
110
111 ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
112 connmark_policy, 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 index = parm->index;
121 ret = tcf_idr_check_alloc(tn, &index, a, bind);
122 if (!ret) {
123 ret = tcf_idr_create(tn, index, est, a,
124 &act_connmark_ops, bind, false);
125 if (ret) {
126 tcf_idr_cleanup(tn, index);
127 return ret;
128 }
129
130 ci = to_connmark(*a);
131 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
132 extack);
133 if (err < 0)
134 goto release_idr;
135 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
136 ci->net = net;
137 ci->zone = parm->zone;
138
139 tcf_idr_insert(tn, *a);
140 ret = ACT_P_CREATED;
141 } else if (ret > 0) {
142 ci = to_connmark(*a);
143 if (bind)
144 return 0;
145 if (!ovr) {
146 tcf_idr_release(*a, bind);
147 return -EEXIST;
148 }
149 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
150 extack);
151 if (err < 0)
152 goto release_idr;
153 /* replacing action and zone */
154 spin_lock_bh(&ci->tcf_lock);
155 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
156 ci->zone = parm->zone;
157 spin_unlock_bh(&ci->tcf_lock);
158 if (goto_ch)
159 tcf_chain_put_by_act(goto_ch);
160 ret = 0;
161 }
162
163 return ret;
164release_idr:
165 tcf_idr_release(*a, bind);
166 return err;
167}
168
169static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
170 int bind, int ref)
171{
172 unsigned char *b = skb_tail_pointer(skb);
173 struct tcf_connmark_info *ci = to_connmark(a);
174 struct tc_connmark opt = {
175 .index = ci->tcf_index,
176 .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
177 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
178 };
179 struct tcf_t t;
180
181 spin_lock_bh(&ci->tcf_lock);
182 opt.action = ci->tcf_action;
183 opt.zone = ci->zone;
184 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
185 goto nla_put_failure;
186
187 tcf_tm_dump(&t, &ci->tcf_tm);
188 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
189 TCA_CONNMARK_PAD))
190 goto nla_put_failure;
191 spin_unlock_bh(&ci->tcf_lock);
192
193 return skb->len;
194
195nla_put_failure:
196 spin_unlock_bh(&ci->tcf_lock);
197 nlmsg_trim(skb, b);
198 return -1;
199}
200
201static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
202 struct netlink_callback *cb, int type,
203 const struct tc_action_ops *ops,
204 struct netlink_ext_ack *extack)
205{
206 struct tc_action_net *tn = net_generic(net, connmark_net_id);
207
208 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
209}
210
211static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
212{
213 struct tc_action_net *tn = net_generic(net, connmark_net_id);
214
215 return tcf_idr_search(tn, a, index);
216}
217
218static struct tc_action_ops act_connmark_ops = {
219 .kind = "connmark",
220 .id = TCA_ID_CONNMARK,
221 .owner = THIS_MODULE,
222 .act = tcf_connmark_act,
223 .dump = tcf_connmark_dump,
224 .init = tcf_connmark_init,
225 .walk = tcf_connmark_walker,
226 .lookup = tcf_connmark_search,
227 .size = sizeof(struct tcf_connmark_info),
228};
229
230static __net_init int connmark_init_net(struct net *net)
231{
232 struct tc_action_net *tn = net_generic(net, connmark_net_id);
233
234 return tc_action_net_init(net, tn, &act_connmark_ops);
235}
236
237static void __net_exit connmark_exit_net(struct list_head *net_list)
238{
239 tc_action_net_exit(net_list, connmark_net_id);
240}
241
242static struct pernet_operations connmark_net_ops = {
243 .init = connmark_init_net,
244 .exit_batch = connmark_exit_net,
245 .id = &connmark_net_id,
246 .size = sizeof(struct tc_action_net),
247};
248
249static int __init connmark_init_module(void)
250{
251 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
252}
253
254static void __exit connmark_cleanup_module(void)
255{
256 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
257}
258
259module_init(connmark_init_module);
260module_exit(connmark_cleanup_module);
261MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
262MODULE_DESCRIPTION("Connection tracking mark restoring");
263MODULE_LICENSE("GPL");