1
2
3
4
5
6
7
8
9
10
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
31#define CONNMARK_TAB_MASK 3
32
33static unsigned int connmark_net_id;
34static struct tc_action_ops act_connmark_ops;
35
36static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
37 struct tcf_result *res)
38{
39 const struct nf_conntrack_tuple_hash *thash;
40 struct nf_conntrack_tuple tuple;
41 enum ip_conntrack_info ctinfo;
42 struct tcf_connmark_info *ca = to_connmark(a);
43 struct nf_conntrack_zone zone;
44 struct nf_conn *c;
45 int proto;
46
47 spin_lock(&ca->tcf_lock);
48 tcf_lastuse_update(&ca->tcf_tm);
49 bstats_update(&ca->tcf_bstats, skb);
50
51 if (skb->protocol == htons(ETH_P_IP)) {
52 if (skb->len < sizeof(struct iphdr))
53 goto out;
54
55 proto = NFPROTO_IPV4;
56 } else if (skb->protocol == htons(ETH_P_IPV6)) {
57 if (skb->len < sizeof(struct ipv6hdr))
58 goto out;
59
60 proto = NFPROTO_IPV6;
61 } else {
62 goto out;
63 }
64
65 c = nf_ct_get(skb, &ctinfo);
66 if (c) {
67 skb->mark = c->mark;
68
69 ca->tcf_qstats.overlimits++;
70 goto out;
71 }
72
73 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
74 proto, ca->net, &tuple))
75 goto out;
76
77 zone.id = ca->zone;
78 zone.dir = NF_CT_DEFAULT_ZONE_DIR;
79
80 thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
81 if (!thash)
82 goto out;
83
84 c = nf_ct_tuplehash_to_ctrack(thash);
85
86 ca->tcf_qstats.overlimits++;
87 skb->mark = c->mark;
88 nf_ct_put(c);
89
90out:
91 spin_unlock(&ca->tcf_lock);
92 return ca->tcf_action;
93}
94
95static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
96 [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
97};
98
99static int tcf_connmark_init(struct net *net, struct nlattr *nla,
100 struct nlattr *est, struct tc_action **a,
101 int ovr, int bind)
102{
103 struct tc_action_net *tn = net_generic(net, connmark_net_id);
104 struct nlattr *tb[TCA_CONNMARK_MAX + 1];
105 struct tcf_connmark_info *ci;
106 struct tc_connmark *parm;
107 int ret = 0;
108
109 if (!nla)
110 return -EINVAL;
111
112 ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
113 if (ret < 0)
114 return ret;
115
116 parm = nla_data(tb[TCA_CONNMARK_PARMS]);
117
118 if (!tcf_hash_check(tn, parm->index, a, bind)) {
119 ret = tcf_hash_create(tn, parm->index, est, a,
120 &act_connmark_ops, bind, false);
121 if (ret)
122 return ret;
123
124 ci = to_connmark(*a);
125 ci->tcf_action = parm->action;
126 ci->net = net;
127 ci->zone = parm->zone;
128
129 tcf_hash_insert(tn, *a);
130 ret = ACT_P_CREATED;
131 } else {
132 ci = to_connmark(*a);
133 if (bind)
134 return 0;
135 tcf_hash_release(*a, bind);
136 if (!ovr)
137 return -EEXIST;
138
139 ci->tcf_action = parm->action;
140 ci->zone = parm->zone;
141 }
142
143 return ret;
144}
145
146static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
147 int bind, int ref)
148{
149 unsigned char *b = skb_tail_pointer(skb);
150 struct tcf_connmark_info *ci = to_connmark(a);
151
152 struct tc_connmark opt = {
153 .index = ci->tcf_index,
154 .refcnt = ci->tcf_refcnt - ref,
155 .bindcnt = ci->tcf_bindcnt - bind,
156 .action = ci->tcf_action,
157 .zone = ci->zone,
158 };
159 struct tcf_t t;
160
161 if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
162 goto nla_put_failure;
163
164 tcf_tm_dump(&t, &ci->tcf_tm);
165 if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
166 TCA_CONNMARK_PAD))
167 goto nla_put_failure;
168
169 return skb->len;
170nla_put_failure:
171 nlmsg_trim(skb, b);
172 return -1;
173}
174
175static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
176 struct netlink_callback *cb, int type,
177 const struct tc_action_ops *ops)
178{
179 struct tc_action_net *tn = net_generic(net, connmark_net_id);
180
181 return tcf_generic_walker(tn, skb, cb, type, ops);
182}
183
184static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
185{
186 struct tc_action_net *tn = net_generic(net, connmark_net_id);
187
188 return tcf_hash_search(tn, a, index);
189}
190
191static struct tc_action_ops act_connmark_ops = {
192 .kind = "connmark",
193 .type = TCA_ACT_CONNMARK,
194 .owner = THIS_MODULE,
195 .act = tcf_connmark,
196 .dump = tcf_connmark_dump,
197 .init = tcf_connmark_init,
198 .walk = tcf_connmark_walker,
199 .lookup = tcf_connmark_search,
200 .size = sizeof(struct tcf_connmark_info),
201};
202
203static __net_init int connmark_init_net(struct net *net)
204{
205 struct tc_action_net *tn = net_generic(net, connmark_net_id);
206
207 return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK);
208}
209
210static void __net_exit connmark_exit_net(struct net *net)
211{
212 struct tc_action_net *tn = net_generic(net, connmark_net_id);
213
214 tc_action_net_exit(tn);
215}
216
217static struct pernet_operations connmark_net_ops = {
218 .init = connmark_init_net,
219 .exit = 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
