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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;
40 struct nf_conntrack_zone zone;
41 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
66 ca->tcf_qstats.overlimits++;
67 goto out;
68 }
69
70 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
71 proto, ca->net, &tuple))
72 goto out;
73
74 zone.id = ca->zone;
75 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
76
77 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
78 if (!thash)
79 goto out;
80
81 c = nf_ct_tuplehash_to_ctrack(thash);
82
83 ca->tcf_qstats.overlimits++;
84 skb->mark = c->mark;
85 nf_ct_put(c);
86
87out:
88 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)) {
115 ret = tcf_hash_create(parm->index, est, a, sizeof(*ci),
116 bind, false);
117 if (ret)
118 return ret;
119
120 ci = to_connmark(a);
121 ci->tcf_action = parm->action;
122 ci->net = net;
123 ci->zone = parm->zone;
124
125 tcf_hash_insert(a);
126 ret = ACT_P_CREATED;
127 } else {
128 ci = to_connmark(a);
129 if (bind)
130 return 0;
131 tcf_hash_release(a, bind);
132 if (!ovr)
133 return -EEXIST;
134
135 ci->tcf_action = parm->action;
136 ci->zone = parm->zone;
137 }
138
139 return ret;
140}
141
142static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
143 int bind, int ref)
144{
145 unsigned char *b = skb_tail_pointer(skb);
146 struct tcf_connmark_info *ci = a->priv;
147
148 struct tc_connmark opt = {
149 .index = ci->tcf_index,
150 .refcnt = ci->tcf_refcnt - ref,
151 .bindcnt = ci->tcf_bindcnt - bind,
152 .action = ci->tcf_action,
153 .zone = ci->zone,
154 };
155 struct tcf_t t;
156
157 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
158 goto nla_put_failure;
159
160 t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install);
161 t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse);
162 t.expires = jiffies_to_clock_t(ci->tcf_tm.expires);
163 if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t))
164 goto nla_put_failure;
165
166 return skb->len;
167nla_put_failure:
168 nlmsg_trim(skb, b);
169 return -1;
170}
171
172static struct tc_action_ops act_connmark_ops = {
173 .kind = "connmark",
174 .type = TCA_ACT_CONNMARK,
175 .owner = THIS_MODULE,
176 .act = tcf_connmark,
177 .dump = tcf_connmark_dump,
178 .init = tcf_connmark_init,
179};
180
181static int __init connmark_init_module(void)
182{
183 return tcf_register_action(&act_connmark_ops, CONNMARK_TAB_MASK);
184}
185
186static void __exit connmark_cleanup_module(void)
187{
188 tcf_unregister_action(&act_connmark_ops);
189}
190
191module_init(connmark_init_module);
192module_exit(connmark_cleanup_module);
193MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
194MODULE_DESCRIPTION("Connection tracking mark restoring");
195MODULE_LICENSE("GPL");
196
197
