2 * net/sched/mirred.c packet mirroring and redirect actions
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.
9 * Authors: Jamal Hadi Salim (2002-4)
11 * TODO: Add ingress support (and socket redirect support)
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/skbuff.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <net/net_namespace.h>
24 #include <net/netlink.h>
25 #include <net/pkt_sched.h>
26 #include <linux/tc_act/tc_mirred.h>
27 #include <net/tc_act/tc_mirred.h>
29 #include <linux/if_arp.h>
31 #define MIRRED_TAB_MASK 7
32 static struct tcf_common *tcf_mirred_ht[MIRRED_TAB_MASK + 1];
33 static u32 mirred_idx_gen;
34 static DEFINE_RWLOCK(mirred_lock);
36 static struct tcf_hashinfo mirred_hash_info = {
37 .htab = tcf_mirred_ht,
38 .hmask = MIRRED_TAB_MASK,
42 static inline int tcf_mirred_release(struct tcf_mirred *m, int bind)
48 if(!m->tcf_bindcnt && m->tcf_refcnt <= 0) {
50 tcf_hash_destroy(&m->common, &mirred_hash_info);
57 static int tcf_mirred_init(struct nlattr *nla, struct nlattr *est,
58 struct tc_action *a, int ovr, int bind)
60 struct nlattr *tb[TCA_MIRRED_MAX + 1];
61 struct tc_mirred *parm;
63 struct tcf_common *pc;
64 struct net_device *dev = NULL;
71 err = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, NULL);
75 if (tb[TCA_MIRRED_PARMS] == NULL ||
76 nla_len(tb[TCA_MIRRED_PARMS]) < sizeof(*parm))
78 parm = nla_data(tb[TCA_MIRRED_PARMS]);
81 dev = __dev_get_by_index(&init_net, parm->ifindex);
99 pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
103 pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
104 &mirred_idx_gen, &mirred_hash_info);
110 tcf_mirred_release(to_mirred(pc), bind);
116 spin_lock_bh(&m->tcf_lock);
117 m->tcf_action = parm->action;
118 m->tcfm_eaction = parm->eaction;
120 m->tcfm_ifindex = parm->ifindex;
121 if (ret != ACT_P_CREATED)
122 dev_put(m->tcfm_dev);
125 m->tcfm_ok_push = ok_push;
127 spin_unlock_bh(&m->tcf_lock);
128 if (ret == ACT_P_CREATED)
129 tcf_hash_insert(pc, &mirred_hash_info);
134 static int tcf_mirred_cleanup(struct tc_action *a, int bind)
136 struct tcf_mirred *m = a->priv;
139 return tcf_mirred_release(m, bind);
143 static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
144 struct tcf_result *res)
146 struct tcf_mirred *m = a->priv;
147 struct net_device *dev;
148 struct sk_buff *skb2 = NULL;
149 u32 at = G_TC_AT(skb->tc_verd);
151 spin_lock(&m->tcf_lock);
154 m->tcf_tm.lastuse = jiffies;
156 if (!(dev->flags&IFF_UP) ) {
158 printk("mirred to Houston: device %s is gone!\n",
163 m->tcf_qstats.overlimits++;
164 m->tcf_bstats.bytes += skb->len;
165 m->tcf_bstats.packets++;
166 spin_unlock(&m->tcf_lock);
167 /* should we be asking for packet to be dropped?
168 * may make sense for redirect case only
173 skb2 = skb_act_clone(skb, GFP_ATOMIC);
176 if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
177 m->tcfm_eaction != TCA_EGRESS_REDIR) {
179 printk("tcf_mirred unknown action %d\n",
184 m->tcf_bstats.bytes += skb2->len;
185 m->tcf_bstats.packets++;
186 if (!(at & AT_EGRESS))
188 skb_push(skb2, skb2->dev->hard_header_len);
190 /* mirror is always swallowed */
191 if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
192 skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
195 skb2->iif = skb->dev->ifindex;
196 dev_queue_xmit(skb2);
197 spin_unlock(&m->tcf_lock);
198 return m->tcf_action;
201 static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
203 unsigned char *b = skb_tail_pointer(skb);
204 struct tcf_mirred *m = a->priv;
205 struct tc_mirred opt;
208 opt.index = m->tcf_index;
209 opt.action = m->tcf_action;
210 opt.refcnt = m->tcf_refcnt - ref;
211 opt.bindcnt = m->tcf_bindcnt - bind;
212 opt.eaction = m->tcfm_eaction;
213 opt.ifindex = m->tcfm_ifindex;
214 NLA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
215 t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install);
216 t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse);
217 t.expires = jiffies_to_clock_t(m->tcf_tm.expires);
218 NLA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
226 static struct tc_action_ops act_mirred_ops = {
228 .hinfo = &mirred_hash_info,
229 .type = TCA_ACT_MIRRED,
230 .capab = TCA_CAP_NONE,
231 .owner = THIS_MODULE,
233 .dump = tcf_mirred_dump,
234 .cleanup = tcf_mirred_cleanup,
235 .lookup = tcf_hash_search,
236 .init = tcf_mirred_init,
237 .walk = tcf_generic_walker
240 MODULE_AUTHOR("Jamal Hadi Salim(2002)");
241 MODULE_DESCRIPTION("Device Mirror/redirect actions");
242 MODULE_LICENSE("GPL");
244 static int __init mirred_init_module(void)
246 printk("Mirror/redirect action on\n");
247 return tcf_register_action(&act_mirred_ops);
250 static void __exit mirred_cleanup_module(void)
252 tcf_unregister_action(&act_mirred_ops);
255 module_init(mirred_init_module);
256 module_exit(mirred_cleanup_module);