--- /dev/null
+/*
+ * net/sched/mirred.c packet mirroring and redirect actions
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Jamal Hadi Salim (2002-4)
+ *
+ * TODO: Add ingress support (and socket redirect support)
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_mirred.h>
+
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+
+
+/* use generic hash table */
+#define MY_TAB_SIZE 8
+#define MY_TAB_MASK (MY_TAB_SIZE - 1)
+static u32 idx_gen;
+static struct tcf_mirred *tcf_mirred_ht[MY_TAB_SIZE];
+static DEFINE_RWLOCK(mirred_lock);
+
+/* ovewrride the defaults */
+#define tcf_st tcf_mirred
+#define tc_st tc_mirred
+#define tcf_t_lock mirred_lock
+#define tcf_ht tcf_mirred_ht
+
+#define CONFIG_NET_ACT_INIT 1
+#include <net/pkt_act.h>
+
+static inline int
+tcf_mirred_release(struct tcf_mirred *p, int bind)
+{
+ if (p) {
+ if (bind)
+ p->bindcnt--;
+ p->refcnt--;
+ if(!p->bindcnt && p->refcnt <= 0) {
+ dev_put(p->dev);
+ tcf_hash_destroy(p);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int
+tcf_mirred_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
+ int ovr, int bind)
+{
+ struct rtattr *tb[TCA_MIRRED_MAX];
+ struct tc_mirred *parm;
+ struct tcf_mirred *p;
+ struct net_device *dev = NULL;
+ int ret = 0;
+ int ok_push = 0;
+
+ if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0)
+ return -EINVAL;
+
+ if (tb[TCA_MIRRED_PARMS-1] == NULL ||
+ RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm))
+ return -EINVAL;
+ parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]);
+
+ if (parm->ifindex) {
+ dev = __dev_get_by_index(parm->ifindex);
+ if (dev == NULL)
+ return -ENODEV;
+ switch (dev->type) {
+ case ARPHRD_TUNNEL:
+ case ARPHRD_TUNNEL6:
+ case ARPHRD_SIT:
+ case ARPHRD_IPGRE:
+ case ARPHRD_VOID:
+ case ARPHRD_NONE:
+ ok_push = 0;
+ break;
+ default:
+ ok_push = 1;
+ break;
+ }
+ }
+
+ p = tcf_hash_check(parm->index, a, ovr, bind);
+ if (p == NULL) {
+ if (!parm->ifindex)
+ return -EINVAL;
+ p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
+ if (p == NULL)
+ return -ENOMEM;
+ ret = ACT_P_CREATED;
+ } else {
+ if (!ovr) {
+ tcf_mirred_release(p, bind);
+ return -EEXIST;
+ }
+ }
+
+ spin_lock_bh(&p->lock);
+ p->action = parm->action;
+ p->eaction = parm->eaction;
+ if (parm->ifindex) {
+ p->ifindex = parm->ifindex;
+ if (ret != ACT_P_CREATED)
+ dev_put(p->dev);
+ p->dev = dev;
+ dev_hold(dev);
+ p->ok_push = ok_push;
+ }
+ spin_unlock_bh(&p->lock);
+ if (ret == ACT_P_CREATED)
+ tcf_hash_insert(p);
+
+ DPRINTK("tcf_mirred_init index %d action %d eaction %d device %s "
+ "ifindex %d\n", parm->index, parm->action, parm->eaction,
+ dev->name, parm->ifindex);
+ return ret;
+}
+
+static int
+tcf_mirred_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_mirred *p = PRIV(a, mirred);
+
+ if (p != NULL)
+ return tcf_mirred_release(p, bind);
+ return 0;
+}
+
+static int
+tcf_mirred(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
+{
+ struct tcf_mirred *p = PRIV(a, mirred);
+ struct net_device *dev;
+ struct sk_buff *skb2 = NULL;
+ u32 at = G_TC_AT(skb->tc_verd);
+
+ spin_lock(&p->lock);
+
+ dev = p->dev;
+ p->tm.lastuse = jiffies;
+
+ if (!(dev->flags&IFF_UP) ) {
+ if (net_ratelimit())
+ printk("mirred to Houston: device %s is gone!\n",
+ dev->name);
+bad_mirred:
+ if (skb2 != NULL)
+ kfree_skb(skb2);
+ p->qstats.overlimits++;
+ p->bstats.bytes += skb->len;
+ p->bstats.packets++;
+ spin_unlock(&p->lock);
+ /* should we be asking for packet to be dropped?
+ * may make sense for redirect case only
+ */
+ return TC_ACT_SHOT;
+ }
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2 == NULL)
+ goto bad_mirred;
+ if (p->eaction != TCA_EGRESS_MIRROR && p->eaction != TCA_EGRESS_REDIR) {
+ if (net_ratelimit())
+ printk("tcf_mirred unknown action %d\n", p->eaction);
+ goto bad_mirred;
+ }
+
+ p->bstats.bytes += skb2->len;
+ p->bstats.packets++;
+ if (!(at & AT_EGRESS))
+ if (p->ok_push)
+ skb_push(skb2, skb2->dev->hard_header_len);
+
+ /* mirror is always swallowed */
+ if (p->eaction != TCA_EGRESS_MIRROR)
+ skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
+
+ skb2->dev = dev;
+ skb2->input_dev = skb->dev;
+ dev_queue_xmit(skb2);
+ spin_unlock(&p->lock);
+ return p->action;
+}
+
+static int
+tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+ unsigned char *b = skb->tail;
+ struct tc_mirred opt;
+ struct tcf_mirred *p = PRIV(a, mirred);
+ struct tcf_t t;
+
+ opt.index = p->index;
+ opt.action = p->action;
+ opt.refcnt = p->refcnt - ref;
+ opt.bindcnt = p->bindcnt - bind;
+ opt.eaction = p->eaction;
+ opt.ifindex = p->ifindex;
+ DPRINTK("tcf_mirred_dump index %d action %d eaction %d ifindex %d\n",
+ p->index, p->action, p->eaction, p->ifindex);
+ RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
+ t.install = jiffies_to_clock_t(jiffies - p->tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
+ t.expires = jiffies_to_clock_t(p->tm.expires);
+ RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
+ return skb->len;
+
+ rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static struct tc_action_ops act_mirred_ops = {
+ .kind = "mirred",
+ .type = TCA_ACT_MIRRED,
+ .capab = TCA_CAP_NONE,
+ .owner = THIS_MODULE,
+ .act = tcf_mirred,
+ .dump = tcf_mirred_dump,
+ .cleanup = tcf_mirred_cleanup,
+ .lookup = tcf_hash_search,
+ .init = tcf_mirred_init,
+ .walk = tcf_generic_walker
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002)");
+MODULE_DESCRIPTION("Device Mirror/redirect actions");
+MODULE_LICENSE("GPL");
+
+static int __init
+mirred_init_module(void)
+{
+ printk("Mirror/redirect action on\n");
+ return tcf_register_action(&act_mirred_ops);
+}
+
+static void __exit
+mirred_cleanup_module(void)
+{
+ tcf_unregister_action(&act_mirred_ops);
+}
+
+module_init(mirred_init_module);
+module_exit(mirred_cleanup_module);
git://git.onelab.eu / linux-2.6.git / blobdiff