1 files changed, 326 insertions, 0 deletions
diff --git a/net/sched/ipt.c b/net/sched/ipt.c
new file mode 100644
index 000000000000..b114d994d523
--- /dev/null
+++ b/net/sched/ipt.c
@@ -0,0 +1,326 @@
+/*
+ * net/sched/ipt.c	iptables target interface
+ *
+ *TODO: Add other tables. For now we only support the ipv4 table targets
+ *
+ *		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.
+ *
+ * Copyright:	Jamal Hadi Salim (2002-4)
+ */
+
+#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 <linux/kmod.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_ipt.h>
+#include <net/tc_act/tc_ipt.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+/* use generic hash table */
+#define MY_TAB_SIZE     16
+#define MY_TAB_MASK     15
+
+static u32 idx_gen;
+static struct tcf_ipt *tcf_ipt_ht[MY_TAB_SIZE];
+/* ipt hash table lock */
+static DEFINE_RWLOCK(ipt_lock);
+
+/* ovewrride the defaults */
+#define tcf_st		tcf_ipt
+#define tcf_t_lock	ipt_lock
+#define tcf_ht		tcf_ipt_ht
+
+#define CONFIG_NET_ACT_INIT
+#include <net/pkt_act.h>
+
+static int
+ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
+{
+	struct ipt_target *target;
+	int ret = 0;
+
+	target = ipt_find_target(t->u.user.name, t->u.user.revision);
+	if (!target)
+		return -ENOENT;
+
+	DPRINTK("ipt_init_target: found %s\n", target->name);
+	t->u.kernel.target = target;
+
+	if (t->u.kernel.target->checkentry
+	    && !t->u.kernel.target->checkentry(table, NULL, t->data,
+					       t->u.target_size - sizeof(*t),
+					       hook)) {
+		DPRINTK("ipt_init_target: check failed for `%s'.\n",
+			t->u.kernel.target->name);
+		module_put(t->u.kernel.target->me);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static void
+ipt_destroy_target(struct ipt_entry_target *t)
+{
+	if (t->u.kernel.target->destroy)
+		t->u.kernel.target->destroy(t->data,
+		                            t->u.target_size - sizeof(*t));
+        module_put(t->u.kernel.target->me);
+}
+
+static int
+tcf_ipt_release(struct tcf_ipt *p, int bind)
+{
+	int ret = 0;
+	if (p) {
+		if (bind)
+			p->bindcnt--;
+		p->refcnt--;
+		if (p->bindcnt <= 0 && p->refcnt <= 0) {
+			ipt_destroy_target(p->t);
+			kfree(p->tname);
+			kfree(p->t);
+			tcf_hash_destroy(p);
+			ret = ACT_P_DELETED;
+		}
+	}
+	return ret;
+}
+
+static int
+tcf_ipt_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
+             int ovr, int bind)
+{
+	struct rtattr *tb[TCA_IPT_MAX];
+	struct tcf_ipt *p;
+	struct ipt_entry_target *td, *t;
+	char *tname;
+	int ret = 0, err;
+	u32 hook = 0;
+	u32 index = 0;
+
+	if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0)
+		return -EINVAL;
+
+	if (tb[TCA_IPT_HOOK-1] == NULL ||
+	    RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32))
+		return -EINVAL;
+	if (tb[TCA_IPT_TARG-1] == NULL ||
+	    RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t))
+		return -EINVAL;
+	td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]);
+	if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size)
+		return -EINVAL;
+
+	if (tb[TCA_IPT_INDEX-1] != NULL &&
+	    RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32))
+		index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]);
+
+	p = tcf_hash_check(index, a, ovr, bind);
+	if (p == NULL) {
+		p = tcf_hash_create(index, est, a, sizeof(*p), ovr, bind);
+		if (p == NULL)
+			return -ENOMEM;
+		ret = ACT_P_CREATED;
+	} else {
+		if (!ovr) {
+			tcf_ipt_release(p, bind);
+			return -EEXIST;
+		}
+	}
+
+	hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
+
+	err = -ENOMEM;
+	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
+	if (tname == NULL)
+		goto err1;
+	if (tb[TCA_IPT_TABLE - 1] == NULL ||
+	    rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
+		strcpy(tname, "mangle");
+
+	t = kmalloc(td->u.target_size, GFP_KERNEL);
+	if (t == NULL)
+		goto err2;
+	memcpy(t, td, td->u.target_size);
+
+	if ((err = ipt_init_target(t, tname, hook)) < 0)
+		goto err3;
+
+	spin_lock_bh(&p->lock);
+	if (ret != ACT_P_CREATED) {
+		ipt_destroy_target(p->t);
+		kfree(p->tname);
+		kfree(p->t);
+	}
+	p->tname = tname;
+	p->t     = t;
+	p->hook  = hook;
+	spin_unlock_bh(&p->lock);
+	if (ret == ACT_P_CREATED)
+		tcf_hash_insert(p);
+	return ret;
+
+err3:
+	kfree(t);
+err2:
+	kfree(tname);
+err1:
+	kfree(p);
+	return err;
+}
+
+static int
+tcf_ipt_cleanup(struct tc_action *a, int bind)
+{
+	struct tcf_ipt *p = PRIV(a, ipt);
+	return tcf_ipt_release(p, bind);
+}
+
+static int
+tcf_ipt(struct sk_buff **pskb, struct tc_action *a)
+{
+	int ret = 0, result = 0;
+	struct tcf_ipt *p = PRIV(a, ipt);
+	struct sk_buff *skb = *pskb;
+
+	if (skb_cloned(skb)) {
+		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+			return TC_ACT_UNSPEC;
+	}
+
+	spin_lock(&p->lock);
+
+	p->tm.lastuse = jiffies;
+	p->bstats.bytes += skb->len;
+	p->bstats.packets++;
+
+	/* yes, we have to worry about both in and out dev
+	 worry later - danger - this API seems to have changed
+	 from earlier kernels */
+
+	ret = p->t->u.kernel.target->target(&skb, skb->dev, NULL,
+					    p->hook, p->t->data, NULL);
+	switch (ret) {
+	case NF_ACCEPT:
+		result = TC_ACT_OK;
+		break;
+	case NF_DROP:
+		result = TC_ACT_SHOT;
+		p->qstats.drops++;
+		break;
+	case IPT_CONTINUE:
+		result = TC_ACT_PIPE;
+		break;
+	default:
+		if (net_ratelimit())
+			printk("Bogus netfilter code %d assume ACCEPT\n", ret);
+		result = TC_POLICE_OK;
+		break;
+	}
+	spin_unlock(&p->lock);
+	return result;
+
+}
+
+static int
+tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+	struct ipt_entry_target *t;
+	struct tcf_t tm;
+	struct tc_cnt c;
+	unsigned char *b = skb->tail;
+	struct tcf_ipt *p = PRIV(a, ipt);
+
+	/* for simple targets kernel size == user size
+	** user name = target name
+	** for foolproof you need to not assume this
+	*/
+
+	t = kmalloc(p->t->u.user.target_size, GFP_ATOMIC);
+	if (t == NULL)
+		goto rtattr_failure;
+
+	c.bindcnt = p->bindcnt - bind;
+	c.refcnt = p->refcnt - ref;
+	memcpy(t, p->t, p->t->u.user.target_size);
+	strcpy(t->u.user.name, p->t->u.kernel.target->name);
+
+	DPRINTK("\ttcf_ipt_dump tablename %s length %d\n", p->tname,
+		strlen(p->tname));
+	DPRINTK("\tdump target name %s size %d size user %d "
+	        "data[0] %x data[1] %x\n", p->t->u.kernel.target->name,
+	        p->t->u.target_size, p->t->u.user.target_size,
+	        p->t->data[0], p->t->data[1]);
+	RTA_PUT(skb, TCA_IPT_TARG, p->t->u.user.target_size, t);
+	RTA_PUT(skb, TCA_IPT_INDEX, 4, &p->index);
+	RTA_PUT(skb, TCA_IPT_HOOK, 4, &p->hook);
+	RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
+	RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, p->tname);
+	tm.install = jiffies_to_clock_t(jiffies - p->tm.install);
+	tm.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
+	tm.expires = jiffies_to_clock_t(p->tm.expires);
+	RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
+	kfree(t);
+	return skb->len;
+
+      rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	kfree(t);
+	return -1;
+}
+
+static struct tc_action_ops act_ipt_ops = {
+	.kind		=	"ipt",
+	.type		=	TCA_ACT_IPT,
+	.capab		=	TCA_CAP_NONE,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_ipt,
+	.dump		=	tcf_ipt_dump,
+	.cleanup	=	tcf_ipt_cleanup,
+	.lookup		=	tcf_hash_search,
+	.init		=	tcf_ipt_init,
+	.walk		=	tcf_generic_walker
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Iptables target actions");
+MODULE_LICENSE("GPL");
+
+static int __init
+ipt_init_module(void)
+{
+	return tcf_register_action(&act_ipt_ops);
+}
+
+static void __exit
+ipt_cleanup_module(void)
+{
+	tcf_unregister_action(&act_ipt_ops);
+}
+
+module_init(ipt_init_module);
+module_exit(ipt_cleanup_module);