1 files changed, 276 insertions, 0 deletions
diff --git a/net/sched/mirred.c b/net/sched/mirred.c
new file mode 100644
index 000000000000..f309ce336803
--- /dev/null
+++ b/net/sched/mirred.c
@@ -0,0 +1,276 @@
+/*
+ * 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 **pskb, struct tc_action *a)
+{
+	struct tcf_mirred *p = PRIV(a, mirred);
+	struct net_device *dev;
+	struct sk_buff *skb2 = NULL;
+	struct sk_buff *skb = *pskb;
+	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);