blob: 483897271f1598bb9d0659887f36a035e1d0381c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
15#include <asm/uaccess.h>
16#include <asm/system.h>
17#include <asm/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/string.h>
22#include <linux/mm.h>
23#include <linux/socket.h>
24#include <linux/sockios.h>
25#include <linux/in.h>
26#include <linux/errno.h>
27#include <linux/interrupt.h>
28#include <linux/netdevice.h>
29#include <linux/skbuff.h>
30#include <linux/rtnetlink.h>
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/proc_fs.h>
34#include <net/sock.h>
35#include <net/pkt_sched.h>
36#include <linux/tc_act/tc_mirred.h>
37#include <net/tc_act/tc_mirred.h>
38
39#include <linux/etherdevice.h>
40#include <linux/if_arp.h>
41
David S. Millere9ce1cd2006-08-21 23:54:55 -070042#define MIRRED_TAB_MASK 7
43static struct tcf_common *tcf_mirred_ht[MIRRED_TAB_MASK + 1];
44static u32 mirred_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static DEFINE_RWLOCK(mirred_lock);
46
David S. Millere9ce1cd2006-08-21 23:54:55 -070047static struct tcf_hashinfo mirred_hash_info = {
48 .htab = tcf_mirred_ht,
49 .hmask = MIRRED_TAB_MASK,
50 .lock = &mirred_lock,
51};
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
David S. Millere9ce1cd2006-08-21 23:54:55 -070053static inline int tcf_mirred_release(struct tcf_mirred *m, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
David S. Millere9ce1cd2006-08-21 23:54:55 -070055 if (m) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070057 m->tcf_bindcnt--;
58 m->tcf_refcnt--;
59 if(!m->tcf_bindcnt && m->tcf_refcnt <= 0) {
60 dev_put(m->tcfm_dev);
61 tcf_hash_destroy(&m->common, &mirred_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 return 1;
63 }
64 }
65 return 0;
66}
67
David S. Millere9ce1cd2006-08-21 23:54:55 -070068static int tcf_mirred_init(struct rtattr *rta, struct rtattr *est,
69 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 struct rtattr *tb[TCA_MIRRED_MAX];
72 struct tc_mirred *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -070073 struct tcf_mirred *m;
74 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 struct net_device *dev = NULL;
76 int ret = 0;
77 int ok_push = 0;
78
79 if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0)
80 return -EINVAL;
81
82 if (tb[TCA_MIRRED_PARMS-1] == NULL ||
83 RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm))
84 return -EINVAL;
85 parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]);
86
87 if (parm->ifindex) {
88 dev = __dev_get_by_index(parm->ifindex);
89 if (dev == NULL)
90 return -ENODEV;
91 switch (dev->type) {
92 case ARPHRD_TUNNEL:
93 case ARPHRD_TUNNEL6:
94 case ARPHRD_SIT:
95 case ARPHRD_IPGRE:
96 case ARPHRD_VOID:
97 case ARPHRD_NONE:
98 ok_push = 0;
99 break;
100 default:
101 ok_push = 1;
102 break;
103 }
104 }
105
David S. Millere9ce1cd2006-08-21 23:54:55 -0700106 pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
107 if (!pc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 if (!parm->ifindex)
109 return -EINVAL;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700110 pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
111 &mirred_idx_gen, &mirred_hash_info);
112 if (unlikely(!pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return -ENOMEM;
114 ret = ACT_P_CREATED;
115 } else {
116 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700117 tcf_mirred_release(to_mirred(pc), bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return -EEXIST;
119 }
120 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700121 m = to_mirred(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123 spin_lock_bh(&m->tcf_lock);
124 m->tcf_action = parm->action;
125 m->tcfm_eaction = parm->eaction;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (parm->ifindex) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700127 m->tcfm_ifindex = parm->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (ret != ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700129 dev_put(m->tcfm_dev);
130 m->tcfm_dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 dev_hold(dev);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700132 m->tcfm_ok_push = ok_push;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700134 spin_unlock_bh(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700136 tcf_hash_insert(pc, &mirred_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 return ret;
139}
140
David S. Millere9ce1cd2006-08-21 23:54:55 -0700141static int tcf_mirred_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700143 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 if (m)
146 return tcf_mirred_release(m, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return 0;
148}
149
David S. Millere9ce1cd2006-08-21 23:54:55 -0700150static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
151 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700153 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 struct net_device *dev;
155 struct sk_buff *skb2 = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 u32 at = G_TC_AT(skb->tc_verd);
157
David S. Millere9ce1cd2006-08-21 23:54:55 -0700158 spin_lock(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
David S. Millere9ce1cd2006-08-21 23:54:55 -0700160 dev = m->tcfm_dev;
161 m->tcf_tm.lastuse = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 if (!(dev->flags&IFF_UP) ) {
164 if (net_ratelimit())
165 printk("mirred to Houston: device %s is gone!\n",
166 dev->name);
167bad_mirred:
168 if (skb2 != NULL)
169 kfree_skb(skb2);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700170 m->tcf_qstats.overlimits++;
171 m->tcf_bstats.bytes += skb->len;
172 m->tcf_bstats.packets++;
173 spin_unlock(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /* should we be asking for packet to be dropped?
175 * may make sense for redirect case only
176 */
177 return TC_ACT_SHOT;
178 }
179
180 skb2 = skb_clone(skb, GFP_ATOMIC);
181 if (skb2 == NULL)
182 goto bad_mirred;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700183 if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
184 m->tcfm_eaction != TCA_EGRESS_REDIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (net_ratelimit())
David S. Millere9ce1cd2006-08-21 23:54:55 -0700186 printk("tcf_mirred unknown action %d\n",
187 m->tcfm_eaction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 goto bad_mirred;
189 }
190
David S. Millere9ce1cd2006-08-21 23:54:55 -0700191 m->tcf_bstats.bytes += skb2->len;
192 m->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (!(at & AT_EGRESS))
David S. Millere9ce1cd2006-08-21 23:54:55 -0700194 if (m->tcfm_ok_push)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 skb_push(skb2, skb2->dev->hard_header_len);
196
197 /* mirror is always swallowed */
David S. Millere9ce1cd2006-08-21 23:54:55 -0700198 if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
200
201 skb2->dev = dev;
202 skb2->input_dev = skb->dev;
203 dev_queue_xmit(skb2);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700204 spin_unlock(&m->tcf_lock);
205 return m->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
David S. Millere9ce1cd2006-08-21 23:54:55 -0700208static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
210 unsigned char *b = skb->tail;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700211 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct tc_mirred opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 struct tcf_t t;
214
David S. Millere9ce1cd2006-08-21 23:54:55 -0700215 opt.index = m->tcf_index;
216 opt.action = m->tcf_action;
217 opt.refcnt = m->tcf_refcnt - ref;
218 opt.bindcnt = m->tcf_bindcnt - bind;
219 opt.eaction = m->tcfm_eaction;
220 opt.ifindex = m->tcfm_ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700222 t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install);
223 t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse);
224 t.expires = jiffies_to_clock_t(m->tcf_tm.expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
226 return skb->len;
227
David S. Millere9ce1cd2006-08-21 23:54:55 -0700228rtattr_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 skb_trim(skb, b - skb->data);
230 return -1;
231}
232
233static struct tc_action_ops act_mirred_ops = {
234 .kind = "mirred",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700235 .hinfo = &mirred_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 .type = TCA_ACT_MIRRED,
237 .capab = TCA_CAP_NONE,
238 .owner = THIS_MODULE,
239 .act = tcf_mirred,
240 .dump = tcf_mirred_dump,
241 .cleanup = tcf_mirred_cleanup,
242 .lookup = tcf_hash_search,
243 .init = tcf_mirred_init,
244 .walk = tcf_generic_walker
245};
246
247MODULE_AUTHOR("Jamal Hadi Salim(2002)");
248MODULE_DESCRIPTION("Device Mirror/redirect actions");
249MODULE_LICENSE("GPL");
250
David S. Millere9ce1cd2006-08-21 23:54:55 -0700251static int __init mirred_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
253 printk("Mirror/redirect action on\n");
254 return tcf_register_action(&act_mirred_ops);
255}
256
David S. Millere9ce1cd2006-08-21 23:54:55 -0700257static void __exit mirred_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
259 tcf_unregister_action(&act_mirred_ops);
260}
261
262module_init(mirred_init_module);
263module_exit(mirred_cleanup_module);