patch-2.3.38 linux/net/sched/sch_ingress.c

• Lines: 393
• Date: Fri Jan 7 16:57:13 2000
• Orig file: v2.3.37/linux/net/sched/sch_ingress.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.37/linux/net/sched/sch_ingress.c linux/net/sched/sch_ingress.c
@@ -0,0 +1,392 @@
+/* net/sched/sch_ingress.c - Ingress qdisc 
+ *              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 1999
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter.h>
+#include <net/pkt_sched.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+#include <asm/smp.h>
+#include <linux/kmod.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+
+
+
+
+#if 0  /* control */
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+#if 0  /* data */
+#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define D2PRINTK(format,args...)
+#endif
+
+
+#define PRIV(sch) ((struct ingress_qdisc_data *) (sch)->data)
+
+
+
+struct ingress_qdisc_data {
+	struct Qdisc		*q;
+	struct tcf_proto	*filter_list;
+};
+
+
+/* ------------------------- Class/flow operations ------------------------- */
+
+
+static int ingress_graft(struct Qdisc *sch,unsigned long arg,
+    struct Qdisc *new,struct Qdisc **old)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n",
+		sch, p, new, old);
+	DPRINTK("\n ingress_graft: You cannot add qdiscs to classes");
+        return 1;
+}
+
+
+static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
+{
+	return NULL;
+}
+
+
+static unsigned long ingress_get(struct Qdisc *sch,u32 classid)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
+	return TC_H_MIN(classid) + 1;
+}
+
+
+static unsigned long ingress_bind_filter(struct Qdisc *sch,
+    unsigned long parent, u32 classid)
+{
+	return ingress_get(sch, classid);
+}
+
+
+static void ingress_put(struct Qdisc *sch, unsigned long cl)
+{
+}
+
+
+static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
+    struct rtattr **tca, unsigned long *arg)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x),"
+		"arg 0x%lx\n", sch, p, classid, parent, *arg);
+	DPRINTK("No effect. sch_ingress doesnt maintain classes at the moment");
+	return 0;
+}
+
+
+
+static void ingress_walk(struct Qdisc *sch,struct qdisc_walker *walker)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
+	DPRINTK("No effect. sch_ingress doesnt maintain classes at the moment");
+}
+
+
+static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch,unsigned long cl)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	return &p->filter_list;
+}
+
+
+/* --------------------------- Qdisc operations ---------------------------- */
+
+
+static int ingress_enqueue(struct sk_buff *skb,struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+	struct tcf_result res;
+	int result;
+
+	D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
+	result = tc_classify(skb, p->filter_list, &res);
+	D2PRINTK("result %d class 0x%04x\n", result, res.classid);
+	/*
+	 * Unlike normal "enqueue" functions, ingress_enqueue returns a
+	 * firewall FW_* code.
+	 */
+	switch (result) {
+#ifdef CONFIG_NET_CLS_POLICE
+		case TC_POLICE_SHOT:
+			result = NF_DROP;
+			break;
+		case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */
+		case TC_POLICE_OK:
+		case TC_POLICE_UNSPEC:
+		default:
+			result = NF_ACCEPT;
+			break;
+#endif
+	};
+
+#ifdef CONFIG_NET_CLS_TCINDEX
+         skb->tc_index = TC_H_MIN(res.classid);
+#endif
+	return result;
+}
+
+
+static struct sk_buff *ingress_dequeue(struct Qdisc *sch)
+{
+/*
+	struct ingress_qdisc_data *p = PRIV(sch);
+	D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p));
+*/
+	return NULL;
+}
+
+
+static int ingress_requeue(struct sk_buff *skb,struct Qdisc *sch)
+{
+/*
+	struct ingress_qdisc_data *p = PRIV(sch);
+	D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p));
+*/
+	return 0;
+}
+
+static int ingress_drop(struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p);
+	return 0;
+}
+
+static unsigned int
+ing_hook(unsigned int hook, struct sk_buff **pskb,
+                             const struct net_device *indev,
+                             const struct net_device *outdev,
+	                     int (*okfn)(struct sk_buff *))
+{
+	
+	struct Qdisc *q;
+	struct sk_buff *skb = *pskb;
+        struct net_device *dev = skb->dev;
+	int fwres=NF_ACCEPT;
+
+	DPRINTK("ing_hook: skb %s dev=%s len=%u\n",
+		skb->sk ? "(owned)" : "(unowned)",
+		skb->dev ? (*pskb)->dev->name : "(no dev)",
+		skb->len);
+
+/* 
+revisit later: Use a private since lock dev->queue_lock is also
+used on the egress (might slow things for an iota)
+*/
+
+	if (dev->qdisc_ingress) {
+		spin_lock(&dev->queue_lock);
+		if ((q = dev->qdisc_ingress) != NULL)
+			fwres = q->enqueue(skb, q);
+		spin_unlock(&dev->queue_lock);
+        }
+			
+	return fwres;
+}
+
+
+/* after iptables */
+static struct nf_hook_ops ing_ops =
+{
+	{ NULL, NULL},
+	ing_hook,
+	NULL,
+	PF_INET,
+	NF_IP_PRE_ROUTING,
+	1
+};
+
+int ingress_init(struct Qdisc *sch,struct rtattr *opt)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
+	memset(p, 0, sizeof(*p));
+	p->filter_list = NULL;
+	p->q = &noop_qdisc;
+#ifndef MODULE
+	if (nf_register_hook(&ing_ops) < 0) {
+		printk("Unable to register ingress \n");
+		goto error;
+	}
+#endif
+	DPRINTK("ingress_init: qdisc %p\n", sch);
+	MOD_INC_USE_COUNT;
+	return 0;
+#ifndef MODULE
+error:
+#endif
+	return -EINVAL;
+}
+
+
+static void ingress_reset(struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
+
+/*
+#if 0
+*/
+/* for future use */
+	qdisc_reset(p->q);
+/*
+#endif
+*/
+}
+
+/* ------------------------------------------------------------- */
+
+
+/* ------------------------------------------------------------- */
+
+static void ingress_destroy(struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = PRIV(sch);
+	struct tcf_proto *tp;
+
+	DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
+	while (p->filter_list) {
+		tp = p->filter_list;
+		p->filter_list = tp->next;
+		tp->ops->destroy(tp);
+	}
+	memset(p, 0, sizeof(*p));
+	p->filter_list = NULL;
+
+#if 0
+/* for future use */
+	qdisc_destroy(p->q);
+#endif
+
+#ifndef MODULE
+	nf_unregister_hook(&ing_ops);
+#endif
+
+	MOD_DEC_USE_COUNT;
+}
+
+
+#ifdef CONFIG_RTNETLINK
+
+
+static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+	unsigned char *b = skb->tail;
+	struct rtattr *rta;
+
+	rta = (struct rtattr *) b;
+	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+	rta->rta_len = skb->tail - b;
+	return skb->len;
+
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+#endif
+
+
+static struct Qdisc_class_ops ingress_class_ops =
+{
+	ingress_graft,			/* graft */
+	ingress_leaf,			/* leaf */
+	ingress_get,			/* get */
+	ingress_put,			/* put */
+	ingress_change,			/* change */
+	NULL,				/* delete */
+	ingress_walk,				/* walk */
+
+	ingress_find_tcf,		/* tcf_chain */
+	ingress_bind_filter,		/* bind_tcf */
+	ingress_put,			/* unbind_tcf */
+
+#ifdef CONFIG_RTNETLINK
+	NULL,		/* dump */
+#endif
+};
+
+struct Qdisc_ops ingress_qdisc_ops =
+{
+	NULL,				/* next */
+	&ingress_class_ops,		/* cl_ops */
+	"ingress",
+	sizeof(struct ingress_qdisc_data),
+
+	ingress_enqueue,		/* enqueue */
+	ingress_dequeue,		/* dequeue */
+	ingress_requeue,		/* requeue */
+	ingress_drop,			/* drop */
+
+	ingress_init,			/* init */
+	ingress_reset,			/* reset */
+	ingress_destroy,		/* destroy */
+	NULL,				/* change */
+
+#ifdef CONFIG_RTNETLINK
+	ingress_dump,			/* dump */
+#endif
+};
+
+#ifdef MODULE
+int init_module(void)
+{
+	int ret = 0;
+
+	if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
+		printk("Unable to register Ingress qdisc\n");
+		return ret;
+	}
+
+        if (nf_register_hook(&ing_ops) < 0) {
+		printk("Unable to register ingress on hook \n");
+		unregister_qdisc(&ingress_qdisc_ops);
+		return 0;
+	}
+
+	return ret;
+}
+
+
+void cleanup_module(void) 
+{
+	nf_unregister_hook(&ing_ops);
+	unregister_qdisc(&ingress_qdisc_ops);
+}
+#endif