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3a63cbb8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e281b198 JE |
2 | /* |
3 | * "TEE" target extension for Xtables | |
4 | * Copyright © Sebastian Claßen, 2007 | |
5 | * Jan Engelhardt, 2007-2010 | |
6 | * | |
7 | * based on ipt_ROUTE.c from Cédric de Launois | |
8 | * <delaunois@info.ucl.be> | |
e281b198 | 9 | */ |
e281b198 | 10 | #include <linux/module.h> |
e281b198 | 11 | #include <linux/skbuff.h> |
bbde9fc1 | 12 | #include <linux/route.h> |
e281b198 | 13 | #include <linux/netfilter/x_tables.h> |
f24d2d4f TY |
14 | #include <net/net_namespace.h> |
15 | #include <net/netns/generic.h> | |
bbde9fc1 PNA |
16 | #include <net/route.h> |
17 | #include <net/netfilter/ipv4/nf_dup_ipv4.h> | |
18 | #include <net/netfilter/ipv6/nf_dup_ipv6.h> | |
e281b198 | 19 | #include <linux/netfilter/xt_TEE.h> |
e281b198 | 20 | |
22265a5c | 21 | struct xt_tee_priv { |
9e2f6c5d | 22 | struct list_head list; |
22265a5c PM |
23 | struct xt_tee_tginfo *tginfo; |
24 | int oif; | |
25 | }; | |
26 | ||
f24d2d4f | 27 | static unsigned int tee_net_id __read_mostly; |
e281b198 JE |
28 | static const union nf_inet_addr tee_zero_address; |
29 | ||
f24d2d4f TY |
30 | struct tee_net { |
31 | struct list_head priv_list; | |
32 | /* lock protects the priv_list */ | |
33 | struct mutex lock; | |
34 | }; | |
35 | ||
e281b198 | 36 | static unsigned int |
4b560b44 | 37 | tee_tg4(struct sk_buff *skb, const struct xt_action_param *par) |
e281b198 JE |
38 | { |
39 | const struct xt_tee_tginfo *info = par->targinfo; | |
45efccdb | 40 | int oif = info->priv ? info->priv->oif : 0; |
e281b198 | 41 | |
613dbd95 | 42 | nf_dup_ipv4(xt_net(par), skb, xt_hooknum(par), &info->gw.in, oif); |
e281b198 | 43 | |
e281b198 JE |
44 | return XT_CONTINUE; |
45 | } | |
46 | ||
5d400a49 | 47 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
e281b198 | 48 | static unsigned int |
4b560b44 | 49 | tee_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
e281b198 JE |
50 | { |
51 | const struct xt_tee_tginfo *info = par->targinfo; | |
45efccdb | 52 | int oif = info->priv ? info->priv->oif : 0; |
e281b198 | 53 | |
613dbd95 | 54 | nf_dup_ipv6(xt_net(par), skb, xt_hooknum(par), &info->gw.in6, oif); |
e281b198 | 55 | |
e281b198 JE |
56 | return XT_CONTINUE; |
57 | } | |
dfd56b8b | 58 | #endif |
e281b198 | 59 | |
22265a5c PM |
60 | static int tee_netdev_event(struct notifier_block *this, unsigned long event, |
61 | void *ptr) | |
62 | { | |
351638e7 | 63 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
f24d2d4f TY |
64 | struct net *net = dev_net(dev); |
65 | struct tee_net *tn = net_generic(net, tee_net_id); | |
22265a5c PM |
66 | struct xt_tee_priv *priv; |
67 | ||
f24d2d4f TY |
68 | mutex_lock(&tn->lock); |
69 | list_for_each_entry(priv, &tn->priv_list, list) { | |
9e2f6c5d KT |
70 | switch (event) { |
71 | case NETDEV_REGISTER: | |
72 | if (!strcmp(dev->name, priv->tginfo->oif)) | |
73 | priv->oif = dev->ifindex; | |
74 | break; | |
75 | case NETDEV_UNREGISTER: | |
76 | if (dev->ifindex == priv->oif) | |
77 | priv->oif = -1; | |
78 | break; | |
79 | case NETDEV_CHANGENAME: | |
80 | if (!strcmp(dev->name, priv->tginfo->oif)) | |
81 | priv->oif = dev->ifindex; | |
82 | else if (dev->ifindex == priv->oif) | |
83 | priv->oif = -1; | |
84 | break; | |
85 | } | |
22265a5c | 86 | } |
f24d2d4f | 87 | mutex_unlock(&tn->lock); |
22265a5c PM |
88 | |
89 | return NOTIFY_DONE; | |
90 | } | |
91 | ||
e281b198 JE |
92 | static int tee_tg_check(const struct xt_tgchk_param *par) |
93 | { | |
f24d2d4f | 94 | struct tee_net *tn = net_generic(par->net, tee_net_id); |
22265a5c PM |
95 | struct xt_tee_tginfo *info = par->targinfo; |
96 | struct xt_tee_priv *priv; | |
e281b198 | 97 | |
e281b198 | 98 | /* 0.0.0.0 and :: not allowed */ |
22265a5c PM |
99 | if (memcmp(&info->gw, &tee_zero_address, |
100 | sizeof(tee_zero_address)) == 0) | |
101 | return -EINVAL; | |
102 | ||
103 | if (info->oif[0]) { | |
18c0ab87 TY |
104 | struct net_device *dev; |
105 | ||
22265a5c PM |
106 | if (info->oif[sizeof(info->oif)-1] != '\0') |
107 | return -EINVAL; | |
108 | ||
109 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
110 | if (priv == NULL) | |
111 | return -ENOMEM; | |
112 | ||
113 | priv->tginfo = info; | |
114 | priv->oif = -1; | |
22265a5c PM |
115 | info->priv = priv; |
116 | ||
18c0ab87 TY |
117 | dev = dev_get_by_name(par->net, info->oif); |
118 | if (dev) { | |
119 | priv->oif = dev->ifindex; | |
120 | dev_put(dev); | |
121 | } | |
f24d2d4f TY |
122 | mutex_lock(&tn->lock); |
123 | list_add(&priv->list, &tn->priv_list); | |
124 | mutex_unlock(&tn->lock); | |
22265a5c PM |
125 | } else |
126 | info->priv = NULL; | |
127 | ||
dcebd315 | 128 | static_key_slow_inc(&xt_tee_enabled); |
22265a5c PM |
129 | return 0; |
130 | } | |
131 | ||
132 | static void tee_tg_destroy(const struct xt_tgdtor_param *par) | |
133 | { | |
f24d2d4f | 134 | struct tee_net *tn = net_generic(par->net, tee_net_id); |
22265a5c PM |
135 | struct xt_tee_tginfo *info = par->targinfo; |
136 | ||
137 | if (info->priv) { | |
f24d2d4f | 138 | mutex_lock(&tn->lock); |
9e2f6c5d | 139 | list_del(&info->priv->list); |
f24d2d4f | 140 | mutex_unlock(&tn->lock); |
22265a5c PM |
141 | kfree(info->priv); |
142 | } | |
dcebd315 | 143 | static_key_slow_dec(&xt_tee_enabled); |
e281b198 JE |
144 | } |
145 | ||
146 | static struct xt_target tee_tg_reg[] __read_mostly = { | |
147 | { | |
148 | .name = "TEE", | |
149 | .revision = 1, | |
150 | .family = NFPROTO_IPV4, | |
151 | .target = tee_tg4, | |
152 | .targetsize = sizeof(struct xt_tee_tginfo), | |
ec231890 | 153 | .usersize = offsetof(struct xt_tee_tginfo, priv), |
e281b198 | 154 | .checkentry = tee_tg_check, |
22265a5c | 155 | .destroy = tee_tg_destroy, |
e281b198 JE |
156 | .me = THIS_MODULE, |
157 | }, | |
5d400a49 | 158 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
e281b198 JE |
159 | { |
160 | .name = "TEE", | |
161 | .revision = 1, | |
162 | .family = NFPROTO_IPV6, | |
163 | .target = tee_tg6, | |
164 | .targetsize = sizeof(struct xt_tee_tginfo), | |
ec231890 | 165 | .usersize = offsetof(struct xt_tee_tginfo, priv), |
e281b198 | 166 | .checkentry = tee_tg_check, |
22265a5c | 167 | .destroy = tee_tg_destroy, |
e281b198 JE |
168 | .me = THIS_MODULE, |
169 | }, | |
170 | #endif | |
171 | }; | |
172 | ||
f24d2d4f TY |
173 | static int __net_init tee_net_init(struct net *net) |
174 | { | |
175 | struct tee_net *tn = net_generic(net, tee_net_id); | |
176 | ||
177 | INIT_LIST_HEAD(&tn->priv_list); | |
178 | mutex_init(&tn->lock); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static struct pernet_operations tee_net_ops = { | |
183 | .init = tee_net_init, | |
184 | .id = &tee_net_id, | |
185 | .size = sizeof(struct tee_net), | |
186 | }; | |
187 | ||
9e2f6c5d KT |
188 | static struct notifier_block tee_netdev_notifier = { |
189 | .notifier_call = tee_netdev_event, | |
190 | }; | |
191 | ||
e281b198 JE |
192 | static int __init tee_tg_init(void) |
193 | { | |
9e2f6c5d KT |
194 | int ret; |
195 | ||
f24d2d4f TY |
196 | ret = register_pernet_subsys(&tee_net_ops); |
197 | if (ret < 0) | |
9e2f6c5d | 198 | return ret; |
f24d2d4f TY |
199 | |
200 | ret = xt_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); | |
201 | if (ret < 0) | |
202 | goto cleanup_subsys; | |
203 | ||
9e2f6c5d | 204 | ret = register_netdevice_notifier(&tee_netdev_notifier); |
f24d2d4f TY |
205 | if (ret < 0) |
206 | goto unregister_targets; | |
9e2f6c5d KT |
207 | |
208 | return 0; | |
f24d2d4f TY |
209 | |
210 | unregister_targets: | |
211 | xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); | |
212 | cleanup_subsys: | |
213 | unregister_pernet_subsys(&tee_net_ops); | |
214 | return ret; | |
e281b198 JE |
215 | } |
216 | ||
217 | static void __exit tee_tg_exit(void) | |
218 | { | |
9e2f6c5d | 219 | unregister_netdevice_notifier(&tee_netdev_notifier); |
e281b198 | 220 | xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); |
f24d2d4f | 221 | unregister_pernet_subsys(&tee_net_ops); |
e281b198 JE |
222 | } |
223 | ||
224 | module_init(tee_tg_init); | |
225 | module_exit(tee_tg_exit); | |
226 | MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>"); | |
227 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); | |
228 | MODULE_DESCRIPTION("Xtables: Reroute packet copy"); | |
229 | MODULE_LICENSE("GPL"); | |
230 | MODULE_ALIAS("ipt_TEE"); | |
231 | MODULE_ALIAS("ip6t_TEE"); |