blob: 68f26cb278f9f74eba6a10e2e682782f4188dd33 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/string.h>
21#include <linux/mm.h>
22#include <linux/socket.h>
23#include <linux/sockios.h>
24#include <linux/in.h>
25#include <linux/errno.h>
26#include <linux/interrupt.h>
27#include <linux/netdevice.h>
28#include <linux/skbuff.h>
29#include <linux/rtnetlink.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/proc_fs.h>
33#include <net/sock.h>
34#include <net/pkt_sched.h>
35#include <linux/tc_act/tc_mirred.h>
36#include <net/tc_act/tc_mirred.h>
37
38#include <linux/etherdevice.h>
39#include <linux/if_arp.h>
40
David S. Millere9ce1cd2006-08-21 23:54:55 -070041#define MIRRED_TAB_MASK 7
42static struct tcf_common *tcf_mirred_ht[MIRRED_TAB_MASK + 1];
43static u32 mirred_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044static DEFINE_RWLOCK(mirred_lock);
45
David S. Millere9ce1cd2006-08-21 23:54:55 -070046static struct tcf_hashinfo mirred_hash_info = {
47 .htab = tcf_mirred_ht,
48 .hmask = MIRRED_TAB_MASK,
49 .lock = &mirred_lock,
50};
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
David S. Millere9ce1cd2006-08-21 23:54:55 -070052static inline int tcf_mirred_release(struct tcf_mirred *m, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
David S. Millere9ce1cd2006-08-21 23:54:55 -070054 if (m) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070056 m->tcf_bindcnt--;
57 m->tcf_refcnt--;
58 if(!m->tcf_bindcnt && m->tcf_refcnt <= 0) {
59 dev_put(m->tcfm_dev);
60 tcf_hash_destroy(&m->common, &mirred_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return 1;
62 }
63 }
64 return 0;
65}
66
David S. Millere9ce1cd2006-08-21 23:54:55 -070067static int tcf_mirred_init(struct rtattr *rta, struct rtattr *est,
68 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 struct rtattr *tb[TCA_MIRRED_MAX];
71 struct tc_mirred *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -070072 struct tcf_mirred *m;
73 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 struct net_device *dev = NULL;
75 int ret = 0;
76 int ok_push = 0;
77
78 if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0)
79 return -EINVAL;
80
81 if (tb[TCA_MIRRED_PARMS-1] == NULL ||
82 RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm))
83 return -EINVAL;
84 parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]);
85
86 if (parm->ifindex) {
87 dev = __dev_get_by_index(parm->ifindex);
88 if (dev == NULL)
89 return -ENODEV;
90 switch (dev->type) {
91 case ARPHRD_TUNNEL:
92 case ARPHRD_TUNNEL6:
93 case ARPHRD_SIT:
94 case ARPHRD_IPGRE:
95 case ARPHRD_VOID:
96 case ARPHRD_NONE:
97 ok_push = 0;
98 break;
99 default:
100 ok_push = 1;
101 break;
102 }
103 }
104
David S. Millere9ce1cd2006-08-21 23:54:55 -0700105 pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
106 if (!pc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 if (!parm->ifindex)
108 return -EINVAL;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700109 pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
110 &mirred_idx_gen, &mirred_hash_info);
111 if (unlikely(!pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return -ENOMEM;
113 ret = ACT_P_CREATED;
114 } else {
115 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700116 tcf_mirred_release(to_mirred(pc), bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 return -EEXIST;
118 }
119 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700120 m = to_mirred(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
David S. Millere9ce1cd2006-08-21 23:54:55 -0700122 spin_lock_bh(&m->tcf_lock);
123 m->tcf_action = parm->action;
124 m->tcfm_eaction = parm->eaction;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 if (parm->ifindex) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 m->tcfm_ifindex = parm->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (ret != ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700128 dev_put(m->tcfm_dev);
129 m->tcfm_dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 dev_hold(dev);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700131 m->tcfm_ok_push = ok_push;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700133 spin_unlock_bh(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700135 tcf_hash_insert(pc, &mirred_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return ret;
138}
139
David S. Millere9ce1cd2006-08-21 23:54:55 -0700140static int tcf_mirred_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
David S. Millere9ce1cd2006-08-21 23:54:55 -0700144 if (m)
145 return tcf_mirred_release(m, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 return 0;
147}
148
David S. Millere9ce1cd2006-08-21 23:54:55 -0700149static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
150 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700152 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 struct net_device *dev;
154 struct sk_buff *skb2 = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 u32 at = G_TC_AT(skb->tc_verd);
156
David S. Millere9ce1cd2006-08-21 23:54:55 -0700157 spin_lock(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
David S. Millere9ce1cd2006-08-21 23:54:55 -0700159 dev = m->tcfm_dev;
160 m->tcf_tm.lastuse = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 if (!(dev->flags&IFF_UP) ) {
163 if (net_ratelimit())
164 printk("mirred to Houston: device %s is gone!\n",
165 dev->name);
166bad_mirred:
167 if (skb2 != NULL)
168 kfree_skb(skb2);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700169 m->tcf_qstats.overlimits++;
170 m->tcf_bstats.bytes += skb->len;
171 m->tcf_bstats.packets++;
172 spin_unlock(&m->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 /* should we be asking for packet to be dropped?
174 * may make sense for redirect case only
175 */
176 return TC_ACT_SHOT;
177 }
178
179 skb2 = skb_clone(skb, GFP_ATOMIC);
180 if (skb2 == NULL)
181 goto bad_mirred;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700182 if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
183 m->tcfm_eaction != TCA_EGRESS_REDIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 if (net_ratelimit())
David S. Millere9ce1cd2006-08-21 23:54:55 -0700185 printk("tcf_mirred unknown action %d\n",
186 m->tcfm_eaction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 goto bad_mirred;
188 }
189
David S. Millere9ce1cd2006-08-21 23:54:55 -0700190 m->tcf_bstats.bytes += skb2->len;
191 m->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (!(at & AT_EGRESS))
David S. Millere9ce1cd2006-08-21 23:54:55 -0700193 if (m->tcfm_ok_push)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 skb_push(skb2, skb2->dev->hard_header_len);
195
196 /* mirror is always swallowed */
David S. Millere9ce1cd2006-08-21 23:54:55 -0700197 if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
199
200 skb2->dev = dev;
201 skb2->input_dev = skb->dev;
202 dev_queue_xmit(skb2);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700203 spin_unlock(&m->tcf_lock);
204 return m->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
206
David S. Millere9ce1cd2006-08-21 23:54:55 -0700207static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 unsigned char *b = skb->tail;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700210 struct tcf_mirred *m = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 struct tc_mirred opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct tcf_t t;
213
David S. Millere9ce1cd2006-08-21 23:54:55 -0700214 opt.index = m->tcf_index;
215 opt.action = m->tcf_action;
216 opt.refcnt = m->tcf_refcnt - ref;
217 opt.bindcnt = m->tcf_bindcnt - bind;
218 opt.eaction = m->tcfm_eaction;
219 opt.ifindex = m->tcfm_ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700221 t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install);
222 t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse);
223 t.expires = jiffies_to_clock_t(m->tcf_tm.expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
225 return skb->len;
226
David S. Millere9ce1cd2006-08-21 23:54:55 -0700227rtattr_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 skb_trim(skb, b - skb->data);
229 return -1;
230}
231
232static struct tc_action_ops act_mirred_ops = {
233 .kind = "mirred",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700234 .hinfo = &mirred_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 .type = TCA_ACT_MIRRED,
236 .capab = TCA_CAP_NONE,
237 .owner = THIS_MODULE,
238 .act = tcf_mirred,
239 .dump = tcf_mirred_dump,
240 .cleanup = tcf_mirred_cleanup,
241 .lookup = tcf_hash_search,
242 .init = tcf_mirred_init,
243 .walk = tcf_generic_walker
244};
245
246MODULE_AUTHOR("Jamal Hadi Salim(2002)");
247MODULE_DESCRIPTION("Device Mirror/redirect actions");
248MODULE_LICENSE("GPL");
249
David S. Millere9ce1cd2006-08-21 23:54:55 -0700250static int __init mirred_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
252 printk("Mirror/redirect action on\n");
253 return tcf_register_action(&act_mirred_ops);
254}
255
David S. Millere9ce1cd2006-08-21 23:54:55 -0700256static void __exit mirred_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
258 tcf_unregister_action(&act_mirred_ops);
259}
260
261module_init(mirred_init_module);
262module_exit(mirred_cleanup_module);