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Commit | Line | Data |
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1da177e4 | 1 | /* |
0c6965dd | 2 | * net/sched/act_mirred.c packet mirroring and redirect actions |
1da177e4 LT |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Jamal Hadi Salim (2002-4) | |
10 | * | |
11 | * TODO: Add ingress support (and socket redirect support) | |
12 | * | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/types.h> |
16 | #include <linux/kernel.h> | |
1da177e4 | 17 | #include <linux/string.h> |
1da177e4 | 18 | #include <linux/errno.h> |
1da177e4 LT |
19 | #include <linux/skbuff.h> |
20 | #include <linux/rtnetlink.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
5a0e3ad6 | 23 | #include <linux/gfp.h> |
881d966b | 24 | #include <net/net_namespace.h> |
dc5fc579 | 25 | #include <net/netlink.h> |
1da177e4 LT |
26 | #include <net/pkt_sched.h> |
27 | #include <linux/tc_act/tc_mirred.h> | |
28 | #include <net/tc_act/tc_mirred.h> | |
29 | ||
1da177e4 LT |
30 | #include <linux/if_arp.h> |
31 | ||
e9ce1cd3 | 32 | #define MIRRED_TAB_MASK 7 |
3b87956e | 33 | static LIST_HEAD(mirred_list); |
6bd00b85 | 34 | static DEFINE_SPINLOCK(mirred_list_lock); |
1da177e4 | 35 | |
a5b5c958 | 36 | static void tcf_mirred_release(struct tc_action *a, int bind) |
1da177e4 | 37 | { |
86062033 | 38 | struct tcf_mirred *m = to_mirred(a); |
dc327f89 | 39 | struct net_device *dev; |
2ee22a90 | 40 | |
6bd00b85 WC |
41 | /* We could be called either in a RCU callback or with RTNL lock held. */ |
42 | spin_lock_bh(&mirred_list_lock); | |
a5b5c958 | 43 | list_del(&m->tcfm_list); |
dc327f89 | 44 | dev = rcu_dereference_protected(m->tcfm_dev, 1); |
2ee22a90 ED |
45 | if (dev) |
46 | dev_put(dev); | |
dc327f89 | 47 | spin_unlock_bh(&mirred_list_lock); |
1da177e4 LT |
48 | } |
49 | ||
53b2bf3f PM |
50 | static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = { |
51 | [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) }, | |
52 | }; | |
53 | ||
ddf97ccd | 54 | static int mirred_net_id; |
a85a970a | 55 | static struct tc_action_ops act_mirred_ops; |
ddf97ccd | 56 | |
c1b52739 | 57 | static int tcf_mirred_init(struct net *net, struct nlattr *nla, |
a85a970a | 58 | struct nlattr *est, struct tc_action **a, int ovr, |
c1b52739 | 59 | int bind) |
1da177e4 | 60 | { |
ddf97ccd | 61 | struct tc_action_net *tn = net_generic(net, mirred_net_id); |
7ba699c6 | 62 | struct nlattr *tb[TCA_MIRRED_MAX + 1]; |
16577923 | 63 | bool mac_header_xmit = false; |
1da177e4 | 64 | struct tc_mirred *parm; |
e9ce1cd3 | 65 | struct tcf_mirred *m; |
b76965e0 | 66 | struct net_device *dev; |
b2313077 | 67 | bool exists = false; |
16577923 | 68 | int ret; |
1da177e4 | 69 | |
cee63723 | 70 | if (nla == NULL) |
1da177e4 | 71 | return -EINVAL; |
b76965e0 CG |
72 | ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy); |
73 | if (ret < 0) | |
74 | return ret; | |
53b2bf3f | 75 | if (tb[TCA_MIRRED_PARMS] == NULL) |
1da177e4 | 76 | return -EINVAL; |
7ba699c6 | 77 | parm = nla_data(tb[TCA_MIRRED_PARMS]); |
87dfbdc6 JHS |
78 | |
79 | exists = tcf_hash_check(tn, parm->index, a, bind); | |
80 | if (exists && bind) | |
81 | return 0; | |
82 | ||
b76965e0 CG |
83 | switch (parm->eaction) { |
84 | case TCA_EGRESS_MIRROR: | |
85 | case TCA_EGRESS_REDIR: | |
86 | break; | |
87 | default: | |
87dfbdc6 | 88 | if (exists) |
a85a970a | 89 | tcf_hash_release(*a, bind); |
b76965e0 CG |
90 | return -EINVAL; |
91 | } | |
1da177e4 | 92 | if (parm->ifindex) { |
c1b52739 | 93 | dev = __dev_get_by_index(net, parm->ifindex); |
87dfbdc6 JHS |
94 | if (dev == NULL) { |
95 | if (exists) | |
a85a970a | 96 | tcf_hash_release(*a, bind); |
1da177e4 | 97 | return -ENODEV; |
87dfbdc6 | 98 | } |
1da177e4 | 99 | switch (dev->type) { |
b76965e0 CG |
100 | case ARPHRD_TUNNEL: |
101 | case ARPHRD_TUNNEL6: | |
102 | case ARPHRD_SIT: | |
103 | case ARPHRD_IPGRE: | |
104 | case ARPHRD_VOID: | |
105 | case ARPHRD_NONE: | |
16577923 | 106 | mac_header_xmit = false; |
b76965e0 CG |
107 | break; |
108 | default: | |
16577923 | 109 | mac_header_xmit = true; |
b76965e0 | 110 | break; |
1da177e4 | 111 | } |
b76965e0 CG |
112 | } else { |
113 | dev = NULL; | |
1da177e4 LT |
114 | } |
115 | ||
87dfbdc6 | 116 | if (!exists) { |
b76965e0 | 117 | if (dev == NULL) |
1da177e4 | 118 | return -EINVAL; |
ddf97ccd | 119 | ret = tcf_hash_create(tn, parm->index, est, a, |
a85a970a | 120 | &act_mirred_ops, bind, true); |
86062033 WC |
121 | if (ret) |
122 | return ret; | |
1da177e4 LT |
123 | ret = ACT_P_CREATED; |
124 | } else { | |
a85a970a | 125 | tcf_hash_release(*a, bind); |
215c90af | 126 | if (!ovr) |
1da177e4 | 127 | return -EEXIST; |
1da177e4 | 128 | } |
a85a970a | 129 | m = to_mirred(*a); |
1da177e4 | 130 | |
2ee22a90 | 131 | ASSERT_RTNL(); |
e9ce1cd3 DM |
132 | m->tcf_action = parm->action; |
133 | m->tcfm_eaction = parm->eaction; | |
b76965e0 | 134 | if (dev != NULL) { |
e9ce1cd3 | 135 | m->tcfm_ifindex = parm->ifindex; |
1da177e4 | 136 | if (ret != ACT_P_CREATED) |
2ee22a90 | 137 | dev_put(rcu_dereference_protected(m->tcfm_dev, 1)); |
1da177e4 | 138 | dev_hold(dev); |
2ee22a90 | 139 | rcu_assign_pointer(m->tcfm_dev, dev); |
16577923 | 140 | m->tcfm_mac_header_xmit = mac_header_xmit; |
1da177e4 | 141 | } |
2ee22a90 | 142 | |
3b87956e | 143 | if (ret == ACT_P_CREATED) { |
6bd00b85 | 144 | spin_lock_bh(&mirred_list_lock); |
3b87956e | 145 | list_add(&m->tcfm_list, &mirred_list); |
6bd00b85 | 146 | spin_unlock_bh(&mirred_list_lock); |
a85a970a | 147 | tcf_hash_insert(tn, *a); |
3b87956e | 148 | } |
1da177e4 | 149 | |
1da177e4 LT |
150 | return ret; |
151 | } | |
152 | ||
dc7f9f6e | 153 | static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 154 | struct tcf_result *res) |
1da177e4 | 155 | { |
a85a970a | 156 | struct tcf_mirred *m = to_mirred(a); |
1da177e4 | 157 | struct net_device *dev; |
feed1f17 | 158 | struct sk_buff *skb2; |
2ee22a90 | 159 | int retval, err; |
feed1f17 | 160 | u32 at; |
1da177e4 | 161 | |
2ee22a90 | 162 | tcf_lastuse_update(&m->tcf_tm); |
2ee22a90 | 163 | bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb); |
1da177e4 | 164 | |
2ee22a90 ED |
165 | rcu_read_lock(); |
166 | retval = READ_ONCE(m->tcf_action); | |
167 | dev = rcu_dereference(m->tcfm_dev); | |
168 | if (unlikely(!dev)) { | |
169 | pr_notice_once("tc mirred: target device is gone\n"); | |
3b87956e | 170 | goto out; |
171 | } | |
172 | ||
2ee22a90 | 173 | if (unlikely(!(dev->flags & IFF_UP))) { |
e87cc472 JP |
174 | net_notice_ratelimited("tc mirred to Houston: device %s is down\n", |
175 | dev->name); | |
feed1f17 | 176 | goto out; |
1da177e4 LT |
177 | } |
178 | ||
210d6de7 | 179 | at = G_TC_AT(skb->tc_verd); |
e578d9c0 | 180 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2ee22a90 | 181 | if (!skb2) |
feed1f17 | 182 | goto out; |
1da177e4 | 183 | |
feed1f17 | 184 | if (!(at & AT_EGRESS)) { |
16577923 | 185 | if (m->tcfm_mac_header_xmit) |
82a31b92 | 186 | skb_push_rcsum(skb2, skb->mac_len); |
feed1f17 | 187 | } |
1da177e4 LT |
188 | |
189 | /* mirror is always swallowed */ | |
e9ce1cd3 | 190 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
1da177e4 LT |
191 | skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); |
192 | ||
8964be4a | 193 | skb2->skb_iif = skb->dev->ifindex; |
210d6de7 | 194 | skb2->dev = dev; |
8919bc13 | 195 | err = dev_queue_xmit(skb2); |
feed1f17 | 196 | |
feed1f17 | 197 | if (err) { |
2ee22a90 ED |
198 | out: |
199 | qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats)); | |
16c0b164 JW |
200 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
201 | retval = TC_ACT_SHOT; | |
2ee22a90 ED |
202 | } |
203 | rcu_read_unlock(); | |
feed1f17 CG |
204 | |
205 | return retval; | |
1da177e4 LT |
206 | } |
207 | ||
9798e6fe JK |
208 | static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets, |
209 | u64 lastuse) | |
210 | { | |
211 | tcf_lastuse_update(&a->tcfa_tm); | |
212 | _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); | |
213 | } | |
214 | ||
5a7a5555 JHS |
215 | static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
216 | int ref) | |
1da177e4 | 217 | { |
27a884dc | 218 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 219 | struct tcf_mirred *m = to_mirred(a); |
1c40be12 ED |
220 | struct tc_mirred opt = { |
221 | .index = m->tcf_index, | |
222 | .action = m->tcf_action, | |
223 | .refcnt = m->tcf_refcnt - ref, | |
224 | .bindcnt = m->tcf_bindcnt - bind, | |
225 | .eaction = m->tcfm_eaction, | |
226 | .ifindex = m->tcfm_ifindex, | |
227 | }; | |
1da177e4 LT |
228 | struct tcf_t t; |
229 | ||
1b34ec43 DM |
230 | if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt)) |
231 | goto nla_put_failure; | |
48d8ee16 JHS |
232 | |
233 | tcf_tm_dump(&t, &m->tcf_tm); | |
9854518e | 234 | if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD)) |
1b34ec43 | 235 | goto nla_put_failure; |
1da177e4 LT |
236 | return skb->len; |
237 | ||
7ba699c6 | 238 | nla_put_failure: |
dc5fc579 | 239 | nlmsg_trim(skb, b); |
1da177e4 LT |
240 | return -1; |
241 | } | |
242 | ||
ddf97ccd WC |
243 | static int tcf_mirred_walker(struct net *net, struct sk_buff *skb, |
244 | struct netlink_callback *cb, int type, | |
a85a970a | 245 | const struct tc_action_ops *ops) |
ddf97ccd WC |
246 | { |
247 | struct tc_action_net *tn = net_generic(net, mirred_net_id); | |
248 | ||
a85a970a | 249 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
250 | } |
251 | ||
a85a970a | 252 | static int tcf_mirred_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
253 | { |
254 | struct tc_action_net *tn = net_generic(net, mirred_net_id); | |
255 | ||
256 | return tcf_hash_search(tn, a, index); | |
257 | } | |
258 | ||
3b87956e | 259 | static int mirred_device_event(struct notifier_block *unused, |
260 | unsigned long event, void *ptr) | |
261 | { | |
351638e7 | 262 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
3b87956e | 263 | struct tcf_mirred *m; |
264 | ||
2ee22a90 | 265 | ASSERT_RTNL(); |
6bd00b85 WC |
266 | if (event == NETDEV_UNREGISTER) { |
267 | spin_lock_bh(&mirred_list_lock); | |
3b87956e | 268 | list_for_each_entry(m, &mirred_list, tcfm_list) { |
2ee22a90 | 269 | if (rcu_access_pointer(m->tcfm_dev) == dev) { |
3b87956e | 270 | dev_put(dev); |
2ee22a90 ED |
271 | /* Note : no rcu grace period necessary, as |
272 | * net_device are already rcu protected. | |
273 | */ | |
274 | RCU_INIT_POINTER(m->tcfm_dev, NULL); | |
3b87956e | 275 | } |
276 | } | |
6bd00b85 WC |
277 | spin_unlock_bh(&mirred_list_lock); |
278 | } | |
3b87956e | 279 | |
280 | return NOTIFY_DONE; | |
281 | } | |
282 | ||
283 | static struct notifier_block mirred_device_notifier = { | |
284 | .notifier_call = mirred_device_event, | |
285 | }; | |
286 | ||
1da177e4 LT |
287 | static struct tc_action_ops act_mirred_ops = { |
288 | .kind = "mirred", | |
289 | .type = TCA_ACT_MIRRED, | |
1da177e4 LT |
290 | .owner = THIS_MODULE, |
291 | .act = tcf_mirred, | |
9798e6fe | 292 | .stats_update = tcf_stats_update, |
1da177e4 | 293 | .dump = tcf_mirred_dump, |
86062033 | 294 | .cleanup = tcf_mirred_release, |
1da177e4 | 295 | .init = tcf_mirred_init, |
ddf97ccd WC |
296 | .walk = tcf_mirred_walker, |
297 | .lookup = tcf_mirred_search, | |
a85a970a | 298 | .size = sizeof(struct tcf_mirred), |
ddf97ccd WC |
299 | }; |
300 | ||
301 | static __net_init int mirred_init_net(struct net *net) | |
302 | { | |
303 | struct tc_action_net *tn = net_generic(net, mirred_net_id); | |
304 | ||
305 | return tc_action_net_init(tn, &act_mirred_ops, MIRRED_TAB_MASK); | |
306 | } | |
307 | ||
308 | static void __net_exit mirred_exit_net(struct net *net) | |
309 | { | |
310 | struct tc_action_net *tn = net_generic(net, mirred_net_id); | |
311 | ||
312 | tc_action_net_exit(tn); | |
313 | } | |
314 | ||
315 | static struct pernet_operations mirred_net_ops = { | |
316 | .init = mirred_init_net, | |
317 | .exit = mirred_exit_net, | |
318 | .id = &mirred_net_id, | |
319 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
320 | }; |
321 | ||
322 | MODULE_AUTHOR("Jamal Hadi Salim(2002)"); | |
323 | MODULE_DESCRIPTION("Device Mirror/redirect actions"); | |
324 | MODULE_LICENSE("GPL"); | |
325 | ||
e9ce1cd3 | 326 | static int __init mirred_init_module(void) |
1da177e4 | 327 | { |
3b87956e | 328 | int err = register_netdevice_notifier(&mirred_device_notifier); |
329 | if (err) | |
330 | return err; | |
331 | ||
6ff9c364 | 332 | pr_info("Mirror/redirect action on\n"); |
ddf97ccd | 333 | return tcf_register_action(&act_mirred_ops, &mirred_net_ops); |
1da177e4 LT |
334 | } |
335 | ||
e9ce1cd3 | 336 | static void __exit mirred_cleanup_module(void) |
1da177e4 | 337 | { |
ddf97ccd | 338 | tcf_unregister_action(&act_mirred_ops, &mirred_net_ops); |
568a153a | 339 | unregister_netdevice_notifier(&mirred_device_notifier); |
1da177e4 LT |
340 | } |
341 | ||
342 | module_init(mirred_init_module); | |
343 | module_exit(mirred_cleanup_module); |