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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
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
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
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{
101 struct tc_action_net *tn = net_generic(net, connmark_net_id);
102 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
103 struct tcf_connmark_info *ci;
104 struct tc_connmark *parm;
105 int ret = 0;
106
107 if (!nla)
108 return -EINVAL;
109
110 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy,
111 NULL);
112 if (ret < 0)
113 return ret;
114
115 if (!tb[TCA_CONNMARK_PARMS])
116 return -EINVAL;
117
118 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
119
120 if (!tcf_idr_check(tn, parm->index, a, bind)) {
121 ret = tcf_idr_create(tn, parm->index, est, a,
122 &act_connmark_ops, bind, false);
123 if (ret)
124 return ret;
125
126 ci = to_connmark(*a);
127 ci->tcf_action = parm->action;
128 ci->net = net;
129 ci->zone = parm->zone;
130
131 tcf_idr_insert(tn, *a);
132 ret = ACT_P_CREATED;
133 } else {
134 ci = to_connmark(*a);
135 if (bind)
136 return 0;
137 tcf_idr_release(*a, bind);
138 if (!ovr)
139 return -EEXIST;
140
141 ci->tcf_action = parm->action;
142 ci->zone = parm->zone;
143 }
144
145 return ret;
146}
147
148static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
149 int bind, int ref)
150{
151 unsigned char *b = skb_tail_pointer(skb);
152 struct tcf_connmark_info *ci = to_connmark(a);
153
154 struct tc_connmark opt = {
155 .index = ci->tcf_index,
156 .refcnt = ci->tcf_refcnt - ref,
157 .bindcnt = ci->tcf_bindcnt - bind,
158 .action = ci->tcf_action,
159 .zone = ci->zone,
160 };
161 struct tcf_t t;
162
163 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
164 goto nla_put_failure;
165
166 tcf_tm_dump(&t, &ci->tcf_tm);
167 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
168 TCA_CONNMARK_PAD))
169 goto nla_put_failure;
170
171 return skb->len;
172nla_put_failure:
173 nlmsg_trim(skb, b);
174 return -1;
175}
176
177static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
178 struct netlink_callback *cb, int type,
179 const struct tc_action_ops *ops)
180{
181 struct tc_action_net *tn = net_generic(net, connmark_net_id);
182
183 return tcf_generic_walker(tn, skb, cb, type, ops);
184}
185
186static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
187{
188 struct tc_action_net *tn = net_generic(net, connmark_net_id);
189
190 return tcf_idr_search(tn, a, index);
191}
192
193static struct tc_action_ops act_connmark_ops = {
194 .kind = "connmark",
195 .type = TCA_ACT_CONNMARK,
196 .owner = THIS_MODULE,
197 .act = tcf_connmark,
198 .dump = tcf_connmark_dump,
199 .init = tcf_connmark_init,
200 .walk = tcf_connmark_walker,
201 .lookup = tcf_connmark_search,
202 .size = sizeof(struct tcf_connmark_info),
203};
204
205static __net_init int connmark_init_net(struct net *net)
206{
207 struct tc_action_net *tn = net_generic(net, connmark_net_id);
208
209 return tc_action_net_init(tn, &act_connmark_ops);
210}
211
212static void __net_exit connmark_exit_net(struct list_head *net_list)
213{
214 tc_action_net_exit(net_list, connmark_net_id);
215}
216
217static struct pernet_operations connmark_net_ops = {
218 .init = connmark_init_net,
219 .exit_batch = connmark_exit_net,
220 .id = &connmark_net_id,
221 .size = sizeof(struct tc_action_net),
222};
223
224static int __init connmark_init_module(void)
225{
226 return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
227}
228
229static void __exit connmark_cleanup_module(void)
230{
231 tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
232}
233
234module_init(connmark_init_module);
235module_exit(connmark_cleanup_module);
236MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
237MODULE_DESCRIPTION("Connection tracking mark restoring");
238MODULE_LICENSE("GPL");
239
240
