1 files changed, 479 insertions, 0 deletions

diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
new file mode 100644
index 00000000000..8a3db9d95ba
--- /dev/null
+++ b/net/sched/sch_dsmark.c
@@ -0,0 +1,479 @@
+/* net/sched/sch_dsmark.c - Differentiated Services field marker */
+
+/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h> /* for pkt_sched */
+#include <linux/rtnetlink.h>
+#include <net/pkt_sched.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <asm/byteorder.h>
+
+
+#if 1 /* 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) qdisc_priv(sch)
+
+
+/*
+ * classid	class		marking
+ * -------	-----		-------
+ *   n/a	  0		n/a
+ *   x:0	  1		use entry [0]
+ *   ...	 ...		...
+ *   x:y y>0	 y+1		use entry [y]
+ *   ...	 ...		...
+ * x:indices-1	indices		use entry [indices-1]
+ *   ...	 ...		...
+ *   x:y	 y+1		use entry [y & (indices-1)]
+ *   ...	 ...		...
+ * 0xffff	0x10000		use entry [indices-1]
+ */
+
+
+#define NO_DEFAULT_INDEX	(1 << 16)
+
+struct dsmark_qdisc_data {
+	struct Qdisc		*q;
+	struct tcf_proto	*filter_list;
+	__u8			*mask;	/* "owns" the array */
+	__u8			*value;
+	__u16			indices;
+	__u32			default_index;	/* index range is 0...0xffff */
+	int			set_tc_index;
+};
+
+
+/* ------------------------- Class/flow operations ------------------------- */
+
+
+static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
+    struct Qdisc *new,struct Qdisc **old)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new,
+	    old);
+	if (!new)
+		new = &noop_qdisc;
+	sch_tree_lock(sch);
+	*old = xchg(&p->q,new);
+	if (*old)
+		qdisc_reset(*old);
+	sch->q.qlen = 0;
+	sch_tree_unlock(sch); /* @@@ move up ? */
+        return 0;
+}
+
+
+static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	return p->q;
+}
+
+
+static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
+{
+	struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
+
+	DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
+	return TC_H_MIN(classid)+1;
+}
+
+
+static unsigned long dsmark_bind_filter(struct Qdisc *sch,
+    unsigned long parent, u32 classid)
+{
+	return dsmark_get(sch,classid);
+}
+
+
+static void dsmark_put(struct Qdisc *sch, unsigned long cl)
+{
+}
+
+
+static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
+    struct rtattr **tca, unsigned long *arg)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	struct rtattr *opt = tca[TCA_OPTIONS-1];
+	struct rtattr *tb[TCA_DSMARK_MAX];
+
+	DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
+	    "arg 0x%lx\n",sch,p,classid,parent,*arg);
+	if (*arg > p->indices)
+		return -ENOENT;
+	if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
+		return -EINVAL;
+	if (tb[TCA_DSMARK_MASK-1]) {
+		if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
+			return -EINVAL;
+		p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
+	}
+	if (tb[TCA_DSMARK_VALUE-1]) {
+		if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
+			return -EINVAL;
+		p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
+	}
+	return 0;
+}
+
+
+static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	if (!arg || arg > p->indices)
+		return -EINVAL;
+	p->mask[arg-1] = 0xff;
+	p->value[arg-1] = 0;
+	return 0;
+}
+
+
+static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	int i;
+
+	DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
+	if (walker->stop)
+		return;
+	for (i = 0; i < p->indices; i++) {
+		if (p->mask[i] == 0xff && !p->value[i])
+			continue;
+		if (walker->count >= walker->skip) {
+			if (walker->fn(sch, i+1, walker) < 0) {
+				walker->stop = 1;
+				break;
+			}
+		}
+                walker->count++;
+        }
+}
+
+
+static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	return &p->filter_list;
+}
+
+
+/* --------------------------- Qdisc operations ---------------------------- */
+
+
+static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	struct tcf_result res;
+	int result;
+	int ret = NET_XMIT_POLICED;
+
+	D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
+	if (p->set_tc_index) {
+		/* FIXME: Safe with non-linear skbs? --RR */
+		switch (skb->protocol) {
+			case __constant_htons(ETH_P_IP):
+				skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
+					& ~INET_ECN_MASK;
+				break;
+			case __constant_htons(ETH_P_IPV6):
+				skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
+					& ~INET_ECN_MASK;
+				break;
+			default:
+				skb->tc_index = 0;
+				break;
+		};
+	}
+	result = TC_POLICE_OK; /* be nice to gcc */
+	if (TC_H_MAJ(skb->priority) == sch->handle) {
+		skb->tc_index = TC_H_MIN(skb->priority);
+	} else {
+		result = tc_classify(skb,p->filter_list,&res);
+		D2PRINTK("result %d class 0x%04x\n",result,res.classid);
+		switch (result) {
+#ifdef CONFIG_NET_CLS_POLICE
+			case TC_POLICE_SHOT:
+				kfree_skb(skb);
+				break;
+#if 0
+			case TC_POLICE_RECLASSIFY:
+				/* FIXME: what to do here ??? */
+#endif
+#endif
+			case TC_POLICE_OK:
+				skb->tc_index = TC_H_MIN(res.classid);
+				break;
+			case TC_POLICE_UNSPEC:
+				/* fall through */
+			default:
+				if (p->default_index != NO_DEFAULT_INDEX)
+					skb->tc_index = p->default_index;
+				break;
+		};
+	}
+	if (
+#ifdef CONFIG_NET_CLS_POLICE
+	    result == TC_POLICE_SHOT ||
+#endif
+
+	    ((ret = p->q->enqueue(skb,p->q)) != 0)) {
+		sch->qstats.drops++;
+		return ret;
+	}
+	sch->bstats.bytes += skb->len;
+	sch->bstats.packets++;
+	sch->q.qlen++;
+	return ret;
+}
+
+
+static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	struct sk_buff *skb;
+	int index;
+
+	D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
+	skb = p->q->ops->dequeue(p->q);
+	if (!skb)
+		return NULL;
+	sch->q.qlen--;
+	index = skb->tc_index & (p->indices-1);
+	D2PRINTK("index %d->%d\n",skb->tc_index,index);
+	switch (skb->protocol) {
+		case __constant_htons(ETH_P_IP):
+			ipv4_change_dsfield(skb->nh.iph,
+			    p->mask[index],p->value[index]);
+			break;
+		case __constant_htons(ETH_P_IPV6):
+			ipv6_change_dsfield(skb->nh.ipv6h,
+			    p->mask[index],p->value[index]);
+			break;
+		default:
+			/*
+			 * Only complain if a change was actually attempted.
+			 * This way, we can send non-IP traffic through dsmark
+			 * and don't need yet another qdisc as a bypass.
+			 */
+			if (p->mask[index] != 0xff || p->value[index])
+				printk(KERN_WARNING "dsmark_dequeue: "
+				       "unsupported protocol %d\n",
+				       htons(skb->protocol));
+			break;
+	};
+	return skb;
+}
+
+
+static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
+{
+	int ret;
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
+        if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
+		sch->q.qlen++;
+		sch->qstats.requeues++;
+		return 0;
+	}
+	sch->qstats.drops++;
+	return ret;
+}
+
+
+static unsigned int dsmark_drop(struct Qdisc *sch)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	unsigned int len;
+	
+	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
+	if (!p->q->ops->drop)
+		return 0;
+	if (!(len = p->q->ops->drop(p->q)))
+		return 0;
+	sch->q.qlen--;
+	return len;
+}
+
+
+static int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	struct rtattr *tb[TCA_DSMARK_MAX];
+	__u16 tmp;
+
+	DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
+	if (!opt ||
+	    rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
+	    !tb[TCA_DSMARK_INDICES-1] ||
+	    RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
+                return -EINVAL;
+	p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
+	if (!p->indices)
+		return -EINVAL;
+	for (tmp = p->indices; tmp != 1; tmp >>= 1) {
+		if (tmp & 1)
+			return -EINVAL;
+	}
+	p->default_index = NO_DEFAULT_INDEX;
+	if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
+		if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
+			return -EINVAL;
+		p->default_index =
+		    *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
+	}
+	p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
+	p->mask = kmalloc(p->indices*2,GFP_KERNEL);
+	if (!p->mask)
+		return -ENOMEM;
+	p->value = p->mask+p->indices;
+	memset(p->mask,0xff,p->indices);
+	memset(p->value,0,p->indices);
+	if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
+		p->q = &noop_qdisc;
+	DPRINTK("dsmark_init: qdisc %p\n",&p->q);
+	return 0;
+}
+
+
+static void dsmark_reset(struct Qdisc *sch)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+
+	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
+	qdisc_reset(p->q);
+	sch->q.qlen = 0;
+}
+
+
+static void dsmark_destroy(struct Qdisc *sch)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	struct tcf_proto *tp;
+
+	DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
+	while (p->filter_list) {
+		tp = p->filter_list;
+		p->filter_list = tp->next;
+		tcf_destroy(tp);
+	}
+	qdisc_destroy(p->q);
+	kfree(p->mask);
+}
+
+
+static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
+    struct sk_buff *skb, struct tcmsg *tcm)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	unsigned char *b = skb->tail;
+	struct rtattr *rta;
+
+	DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
+	if (!cl || cl > p->indices)
+		return -EINVAL;
+	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
+	rta = (struct rtattr *) b;
+	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
+	RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
+	RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
+	rta->rta_len = skb->tail-b;
+	return skb->len;
+
+rtattr_failure:
+	skb_trim(skb,b-skb->data);
+	return -1;
+}
+
+static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+	struct dsmark_qdisc_data *p = PRIV(sch);
+	unsigned char *b = skb->tail;
+	struct rtattr *rta;
+
+	rta = (struct rtattr *) b;
+	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
+	RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
+	if (p->default_index != NO_DEFAULT_INDEX) {
+		__u16 tmp = p->default_index;
+
+		RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
+	}
+	if (p->set_tc_index)
+		RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
+	rta->rta_len = skb->tail-b;
+	return skb->len;
+
+rtattr_failure:
+	skb_trim(skb,b-skb->data);
+	return -1;
+}
+
+static struct Qdisc_class_ops dsmark_class_ops = {
+	.graft		=	dsmark_graft,
+	.leaf		=	dsmark_leaf,
+	.get		=	dsmark_get,
+	.put		=	dsmark_put,
+	.change		=	dsmark_change,
+	.delete		=	dsmark_delete,
+	.walk		=	dsmark_walk,
+	.tcf_chain	=	dsmark_find_tcf,
+	.bind_tcf	=	dsmark_bind_filter,
+	.unbind_tcf	=	dsmark_put,
+	.dump		=	dsmark_dump_class,
+};
+
+static struct Qdisc_ops dsmark_qdisc_ops = {
+	.next		=	NULL,
+	.cl_ops		=	&dsmark_class_ops,
+	.id		=	"dsmark",
+	.priv_size	=	sizeof(struct dsmark_qdisc_data),
+	.enqueue	=	dsmark_enqueue,
+	.dequeue	=	dsmark_dequeue,
+	.requeue	=	dsmark_requeue,
+	.drop		=	dsmark_drop,
+	.init		=	dsmark_init,
+	.reset		=	dsmark_reset,
+	.destroy	=	dsmark_destroy,
+	.change		=	NULL,
+	.dump		=	dsmark_dump,
+	.owner		=	THIS_MODULE,
+};
+
+static int __init dsmark_module_init(void)
+{
+	return register_qdisc(&dsmark_qdisc_ops);
+}
+static void __exit dsmark_module_exit(void) 
+{
+	unregister_qdisc(&dsmark_qdisc_ops);
+}
+module_init(dsmark_module_init)
+module_exit(dsmark_module_exit)
+MODULE_LICENSE("GPL");