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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#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 nf_conntrack_zone zone;
40 struct nf_conn *c;
41 int proto;
42
43 spin_lock(&ca->tcf_lock);
44 tcf_lastuse_update(&ca->tcf_tm);
45 bstats_update(&ca->tcf_bstats, skb);
46
47 switch (skb_protocol(skb, true)) {
48 case htons(ETH_P_IP):
49 if (skb->len < sizeof(struct iphdr))
50 goto out;
51
52 proto = NFPROTO_IPV4;
53 break;
54 case htons(ETH_P_IPV6):
55 if (skb->len < sizeof(struct ipv6hdr))
56 goto out;
57
58 proto = NFPROTO_IPV6;
59 break;
60 default:
61 goto out;
62 }
63
64 c = nf_ct_get(skb, &ctinfo);
65 if (c) {
66 skb->mark = READ_ONCE(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 = READ_ONCE(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 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 nlattr *tb[TCA_CONNMARK_MAX + 1];
105 bool bind = flags & TCA_ACT_FLAGS_BIND;
106 struct tcf_chain *goto_ch = NULL;
107 struct tcf_connmark_info *ci;
108 struct tc_connmark *parm;
109 int ret = 0, err;
110 u32 index;
111
112 if (!nla)
113 return -EINVAL;
114
115 ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
116 connmark_policy, NULL);
117 if (ret < 0)
118 return ret;
119
120 if (!tb[TCA_CONNMARK_PARMS])
121 return -EINVAL;
122
123 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
124 index = parm->index;
125 ret = tcf_idr_check_alloc(tn, &index, a, bind);
126 if (!ret) {
127 ret = tcf_idr_create(tn, index, est, a,
128 &act_connmark_ops, bind, false, flags);
129 if (ret) {
130 tcf_idr_cleanup(tn, index);
131 return ret;
132 }
133
134 ci = to_connmark(*a);
135 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
136 extack);
137 if (err < 0)
138 goto release_idr;
139 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
140 ci->net = net;
141 ci->zone = parm->zone;
142
143 ret = ACT_P_CREATED;
144 } else if (ret > 0) {
145 ci = to_connmark(*a);
146 if (bind)
147 return 0;
148 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
149 tcf_idr_release(*a, bind);
150 return -EEXIST;
151 }
152 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
153 extack);
154 if (err < 0)
155 goto release_idr;
156 /* replacing action and zone */
157 spin_lock_bh(&ci->tcf_lock);
158 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
159 ci->zone = parm->zone;
160 spin_unlock_bh(&ci->tcf_lock);
161 if (goto_ch)
162 tcf_chain_put_by_act(goto_ch);
163 ret = 0;
164 }
165
166 return ret;
167release_idr:
168 tcf_idr_release(*a, bind);
169 return err;
170}
171
172static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
173 int bind, int ref)
174{
175 unsigned char *b = skb_tail_pointer(skb);
176 struct tcf_connmark_info *ci = to_connmark(a);
177 struct tc_connmark opt = {
178 .index = ci->tcf_index,
179 .refcnt = refcount_read(&ci->tcf_refcnt) - ref,
180 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
181 };
182 struct tcf_t t;
183
184 spin_lock_bh(&ci->tcf_lock);
185 opt.action = ci->tcf_action;
186 opt.zone = ci->zone;
187 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
188 goto nla_put_failure;
189
190 tcf_tm_dump(&t, &ci->tcf_tm);
191 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
192 TCA_CONNMARK_PAD))
193 goto nla_put_failure;
194 spin_unlock_bh(&ci->tcf_lock);
195
196 return skb->len;
197
198nla_put_failure:
199 spin_unlock_bh(&ci->tcf_lock);
200 nlmsg_trim(skb, b);
201 return -1;
202}
203
204static struct tc_action_ops act_connmark_ops = {
205 .kind = "connmark",
206 .id = TCA_ID_CONNMARK,
207 .owner = THIS_MODULE,
208 .act = tcf_connmark_act,
209 .dump = tcf_connmark_dump,
210 .init = tcf_connmark_init,
211 .size = sizeof(struct tcf_connmark_info),
212};
213
214static __net_init int connmark_init_net(struct net *net)
215{
216 struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
217
218 return tc_action_net_init(net, tn, &act_connmark_ops);
219}
220
221static void __net_exit connmark_exit_net(struct list_head *net_list)
222{
223 tc_action_net_exit(net_list, act_connmark_ops.net_id);
224}
225
226static struct pernet_operations connmark_net_ops = {
227 .init = connmark_init_net,
228 .exit_batch = connmark_exit_net,
229 .id = &act_connmark_ops.net_id,
230 .size = sizeof(struct tc_action_net),
231};
232
233static int __init connmark_init_module(void)
234{
235 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
236}
237
238static void __exit connmark_cleanup_module(void)
239{
240 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
241}
242
243module_init(connmark_init_module);
244module_exit(connmark_cleanup_module);
245MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
246MODULE_DESCRIPTION("Connection tracking mark restoring");
247MODULE_LICENSE("GPL");