Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/mirred.c packet mirroring and redirect actions | |
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); |
1da177e4 | 34 | |
a5b5c958 | 35 | static void tcf_mirred_release(struct tc_action *a, int bind) |
1da177e4 | 36 | { |
86062033 | 37 | struct tcf_mirred *m = to_mirred(a); |
a5b5c958 WC |
38 | list_del(&m->tcfm_list); |
39 | if (m->tcfm_dev) | |
40 | dev_put(m->tcfm_dev); | |
1da177e4 LT |
41 | } |
42 | ||
53b2bf3f PM |
43 | static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = { |
44 | [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) }, | |
45 | }; | |
46 | ||
c1b52739 BL |
47 | static int tcf_mirred_init(struct net *net, struct nlattr *nla, |
48 | struct nlattr *est, struct tc_action *a, int ovr, | |
49 | int bind) | |
1da177e4 | 50 | { |
7ba699c6 | 51 | struct nlattr *tb[TCA_MIRRED_MAX + 1]; |
1da177e4 | 52 | struct tc_mirred *parm; |
e9ce1cd3 | 53 | struct tcf_mirred *m; |
b76965e0 CG |
54 | struct net_device *dev; |
55 | int ret, ok_push = 0; | |
1da177e4 | 56 | |
cee63723 | 57 | if (nla == NULL) |
1da177e4 | 58 | return -EINVAL; |
b76965e0 CG |
59 | ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy); |
60 | if (ret < 0) | |
61 | return ret; | |
53b2bf3f | 62 | if (tb[TCA_MIRRED_PARMS] == NULL) |
1da177e4 | 63 | return -EINVAL; |
7ba699c6 | 64 | parm = nla_data(tb[TCA_MIRRED_PARMS]); |
b76965e0 CG |
65 | switch (parm->eaction) { |
66 | case TCA_EGRESS_MIRROR: | |
67 | case TCA_EGRESS_REDIR: | |
68 | break; | |
69 | default: | |
70 | return -EINVAL; | |
71 | } | |
1da177e4 | 72 | if (parm->ifindex) { |
c1b52739 | 73 | dev = __dev_get_by_index(net, parm->ifindex); |
1da177e4 LT |
74 | if (dev == NULL) |
75 | return -ENODEV; | |
76 | switch (dev->type) { | |
b76965e0 CG |
77 | case ARPHRD_TUNNEL: |
78 | case ARPHRD_TUNNEL6: | |
79 | case ARPHRD_SIT: | |
80 | case ARPHRD_IPGRE: | |
81 | case ARPHRD_VOID: | |
82 | case ARPHRD_NONE: | |
83 | ok_push = 0; | |
84 | break; | |
85 | default: | |
86 | ok_push = 1; | |
87 | break; | |
1da177e4 | 88 | } |
b76965e0 CG |
89 | } else { |
90 | dev = NULL; | |
1da177e4 LT |
91 | } |
92 | ||
86062033 | 93 | if (!tcf_hash_check(parm->index, a, bind)) { |
b76965e0 | 94 | if (dev == NULL) |
1da177e4 | 95 | return -EINVAL; |
86062033 WC |
96 | ret = tcf_hash_create(parm->index, est, a, sizeof(*m), bind); |
97 | if (ret) | |
98 | return ret; | |
1da177e4 LT |
99 | ret = ACT_P_CREATED; |
100 | } else { | |
101 | if (!ovr) { | |
a5b5c958 | 102 | tcf_hash_release(a, bind); |
1da177e4 LT |
103 | return -EEXIST; |
104 | } | |
105 | } | |
86062033 | 106 | m = to_mirred(a); |
1da177e4 | 107 | |
e9ce1cd3 DM |
108 | spin_lock_bh(&m->tcf_lock); |
109 | m->tcf_action = parm->action; | |
110 | m->tcfm_eaction = parm->eaction; | |
b76965e0 | 111 | if (dev != NULL) { |
e9ce1cd3 | 112 | m->tcfm_ifindex = parm->ifindex; |
1da177e4 | 113 | if (ret != ACT_P_CREATED) |
e9ce1cd3 | 114 | dev_put(m->tcfm_dev); |
1da177e4 | 115 | dev_hold(dev); |
b76965e0 | 116 | m->tcfm_dev = dev; |
e9ce1cd3 | 117 | m->tcfm_ok_push = ok_push; |
1da177e4 | 118 | } |
e9ce1cd3 | 119 | spin_unlock_bh(&m->tcf_lock); |
3b87956e | 120 | if (ret == ACT_P_CREATED) { |
121 | list_add(&m->tcfm_list, &mirred_list); | |
86062033 | 122 | tcf_hash_insert(a); |
3b87956e | 123 | } |
1da177e4 | 124 | |
1da177e4 LT |
125 | return ret; |
126 | } | |
127 | ||
dc7f9f6e | 128 | static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 129 | struct tcf_result *res) |
1da177e4 | 130 | { |
e9ce1cd3 | 131 | struct tcf_mirred *m = a->priv; |
1da177e4 | 132 | struct net_device *dev; |
feed1f17 CG |
133 | struct sk_buff *skb2; |
134 | u32 at; | |
135 | int retval, err = 1; | |
1da177e4 | 136 | |
e9ce1cd3 | 137 | spin_lock(&m->tcf_lock); |
e9ce1cd3 | 138 | m->tcf_tm.lastuse = jiffies; |
bfe0d029 | 139 | bstats_update(&m->tcf_bstats, skb); |
1da177e4 | 140 | |
feed1f17 | 141 | dev = m->tcfm_dev; |
3b87956e | 142 | if (!dev) { |
143 | printk_once(KERN_NOTICE "tc mirred: target device is gone\n"); | |
144 | goto out; | |
145 | } | |
146 | ||
feed1f17 | 147 | if (!(dev->flags & IFF_UP)) { |
e87cc472 JP |
148 | net_notice_ratelimited("tc mirred to Houston: device %s is down\n", |
149 | dev->name); | |
feed1f17 | 150 | goto out; |
1da177e4 LT |
151 | } |
152 | ||
210d6de7 CG |
153 | at = G_TC_AT(skb->tc_verd); |
154 | skb2 = skb_act_clone(skb, GFP_ATOMIC, m->tcf_action); | |
1da177e4 | 155 | if (skb2 == NULL) |
feed1f17 | 156 | goto out; |
1da177e4 | 157 | |
feed1f17 | 158 | if (!(at & AT_EGRESS)) { |
e9ce1cd3 | 159 | if (m->tcfm_ok_push) |
1da177e4 | 160 | skb_push(skb2, skb2->dev->hard_header_len); |
feed1f17 | 161 | } |
1da177e4 LT |
162 | |
163 | /* mirror is always swallowed */ | |
e9ce1cd3 | 164 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
1da177e4 LT |
165 | skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); |
166 | ||
8964be4a | 167 | skb2->skb_iif = skb->dev->ifindex; |
210d6de7 | 168 | skb2->dev = dev; |
8919bc13 | 169 | err = dev_queue_xmit(skb2); |
feed1f17 CG |
170 | |
171 | out: | |
172 | if (err) { | |
173 | m->tcf_qstats.overlimits++; | |
16c0b164 JW |
174 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
175 | retval = TC_ACT_SHOT; | |
176 | else | |
177 | retval = m->tcf_action; | |
178 | } else | |
feed1f17 | 179 | retval = m->tcf_action; |
e9ce1cd3 | 180 | spin_unlock(&m->tcf_lock); |
feed1f17 CG |
181 | |
182 | return retval; | |
1da177e4 LT |
183 | } |
184 | ||
e9ce1cd3 | 185 | static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 186 | { |
27a884dc | 187 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 188 | struct tcf_mirred *m = a->priv; |
1c40be12 ED |
189 | struct tc_mirred opt = { |
190 | .index = m->tcf_index, | |
191 | .action = m->tcf_action, | |
192 | .refcnt = m->tcf_refcnt - ref, | |
193 | .bindcnt = m->tcf_bindcnt - bind, | |
194 | .eaction = m->tcfm_eaction, | |
195 | .ifindex = m->tcfm_ifindex, | |
196 | }; | |
1da177e4 LT |
197 | struct tcf_t t; |
198 | ||
1b34ec43 DM |
199 | if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt)) |
200 | goto nla_put_failure; | |
e9ce1cd3 DM |
201 | t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install); |
202 | t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse); | |
203 | t.expires = jiffies_to_clock_t(m->tcf_tm.expires); | |
1b34ec43 DM |
204 | if (nla_put(skb, TCA_MIRRED_TM, sizeof(t), &t)) |
205 | goto nla_put_failure; | |
1da177e4 LT |
206 | return skb->len; |
207 | ||
7ba699c6 | 208 | nla_put_failure: |
dc5fc579 | 209 | nlmsg_trim(skb, b); |
1da177e4 LT |
210 | return -1; |
211 | } | |
212 | ||
3b87956e | 213 | static int mirred_device_event(struct notifier_block *unused, |
214 | unsigned long event, void *ptr) | |
215 | { | |
351638e7 | 216 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
3b87956e | 217 | struct tcf_mirred *m; |
218 | ||
219 | if (event == NETDEV_UNREGISTER) | |
220 | list_for_each_entry(m, &mirred_list, tcfm_list) { | |
224e923c | 221 | spin_lock_bh(&m->tcf_lock); |
3b87956e | 222 | if (m->tcfm_dev == dev) { |
223 | dev_put(dev); | |
224 | m->tcfm_dev = NULL; | |
225 | } | |
224e923c | 226 | spin_unlock_bh(&m->tcf_lock); |
3b87956e | 227 | } |
228 | ||
229 | return NOTIFY_DONE; | |
230 | } | |
231 | ||
232 | static struct notifier_block mirred_device_notifier = { | |
233 | .notifier_call = mirred_device_event, | |
234 | }; | |
235 | ||
1da177e4 LT |
236 | static struct tc_action_ops act_mirred_ops = { |
237 | .kind = "mirred", | |
238 | .type = TCA_ACT_MIRRED, | |
1da177e4 LT |
239 | .owner = THIS_MODULE, |
240 | .act = tcf_mirred, | |
241 | .dump = tcf_mirred_dump, | |
86062033 | 242 | .cleanup = tcf_mirred_release, |
1da177e4 | 243 | .init = tcf_mirred_init, |
1da177e4 LT |
244 | }; |
245 | ||
246 | MODULE_AUTHOR("Jamal Hadi Salim(2002)"); | |
247 | MODULE_DESCRIPTION("Device Mirror/redirect actions"); | |
248 | MODULE_LICENSE("GPL"); | |
249 | ||
e9ce1cd3 | 250 | static int __init mirred_init_module(void) |
1da177e4 | 251 | { |
3b87956e | 252 | int err = register_netdevice_notifier(&mirred_device_notifier); |
253 | if (err) | |
254 | return err; | |
255 | ||
6ff9c364 | 256 | pr_info("Mirror/redirect action on\n"); |
4f1e9d89 | 257 | return tcf_register_action(&act_mirred_ops, MIRRED_TAB_MASK); |
1da177e4 LT |
258 | } |
259 | ||
e9ce1cd3 | 260 | static void __exit mirred_cleanup_module(void) |
1da177e4 LT |
261 | { |
262 | tcf_unregister_action(&act_mirred_ops); | |
568a153a | 263 | unregister_netdevice_notifier(&mirred_device_notifier); |
1da177e4 LT |
264 | } |
265 | ||
266 | module_init(mirred_init_module); | |
267 | module_exit(mirred_cleanup_module); |