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

• Lines: 504
• Date: Fri Jan 7 16:57:13 2000
• Orig file: v2.3.37/linux/net/sched/cls_tcindex.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.37/linux/net/sched/cls_tcindex.c linux/net/sched/cls_tcindex.c
@@ -0,0 +1,503 @@
+/*
+ * net/sched/cls_tcindex.c	Packet classifier for skb->tc_index
+ *
+ * Written 1998,1999 by Werner Almesberger, EPFL ICA
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <net/ip.h>
+#include <net/pkt_sched.h>
+#include <net/route.h>
+
+
+/*
+ * Not quite sure if we need all the xchgs Alexey uses when accessing things.
+ * Can always add them later ... :)
+ */
+
+/*
+ * Passing parameters to the root seems to be done more awkwardly than really
+ * necessary. At least, u32 doesn't seem to use such dirty hacks. To be
+ * verified. FIXME.
+ */
+
+#define PERFECT_HASH_THRESHOLD	64	/* use perfect hash if not bigger */
+#define DEFAULT_HASH_SIZE	64	/* optimized for diffserv */
+
+
+#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(tp)	((struct tcindex_data *) (tp)->root)
+
+
+struct tcindex_filter_result {
+	struct tcf_police *police;
+	struct tcf_result res;
+};
+
+struct tcindex_filter {
+	__u16 key;
+	struct tcindex_filter_result result;
+	struct tcindex_filter *next;
+};
+
+
+struct tcindex_data {
+	struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
+	struct tcindex_filter **h; /* imperfect hash; only used if !perfect;
+				      NULL if unused */
+	__u16 mask;		/* AND key with mask */
+	int shift;		/* shift ANDed key to the right */
+	int hash;		/* hash table size; 0 if undefined */
+	int alloc_hash;		/* allocated size */
+	int fall_through;	/* 0: only classify if explicit match */
+};
+
+
+static struct tcindex_filter_result *lookup(struct tcindex_data *p,__u16 key)
+{
+	struct tcindex_filter *f;
+
+	if (p->perfect)
+		return p->perfect[key].res.classid ? p->perfect+key : NULL;
+	if (!p->h)
+		return NULL;
+	for (f = p->h[key % p->hash]; f; f = f->next) {
+		if (f->key == key)
+			return &f->result;
+	}
+	return NULL;
+}
+
+
+static int tcindex_classify(struct sk_buff *skb, struct tcf_proto *tp,
+			  struct tcf_result *res)
+{
+	struct tcindex_data *p = PRIV(tp);
+	struct tcindex_filter_result *f;
+
+	D2PRINTK("tcindex_classify(skb %p,tp %p,res %p),p %p\n",skb,tp,res,p);
+
+	f = lookup(p,(skb->tc_index & p->mask) >> p->shift);
+	if (!f) {
+		if (!p->fall_through)
+			return -1;
+		res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle),
+		    (skb->tc_index& p->mask) >> p->shift);
+		res->class = 0;
+		D2PRINTK("alg 0x%x\n",res->classid);
+		return 0;
+	}
+	*res = f->res;
+	D2PRINTK("map 0x%x\n",res->classid);
+#ifdef CONFIG_NET_CLS_POLICE
+	if (f->police) {
+		int result;
+
+		result = tcf_police(skb,f->police);
+		D2PRINTK("police %d\n",res);
+		return result;
+	}
+#endif
+	return 0;
+}
+
+
+static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
+{
+	DPRINTK("tcindex_get(tp %p,handle 0x%08x)\n",tp,handle);
+	return (unsigned long) lookup(PRIV(tp),handle);
+}
+
+
+static void tcindex_put(struct tcf_proto *tp, unsigned long f)
+{
+	DPRINTK("tcindex_put(tp %p,f 0x%lx)\n",tp,f);
+}
+
+
+static int tcindex_init(struct tcf_proto *tp)
+{
+	struct tcindex_data *p;
+
+	DPRINTK("tcindex_init(tp %p)\n",tp);
+	MOD_INC_USE_COUNT;
+	p = kmalloc(sizeof(struct tcindex_data),GFP_KERNEL);
+	if (!p) {
+		MOD_DEC_USE_COUNT;
+		return -ENOMEM;
+	}
+	tp->root = p;
+	p->perfect = NULL;
+	p->h = NULL;
+	p->hash = 0;
+	p->mask = 0xffff;
+	p->shift = 0;
+	p->fall_through = 1;
+	return 0;
+}
+
+
+static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
+{
+	struct tcindex_data *p = PRIV(tp);
+	struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
+	struct tcindex_filter *f = NULL;
+	unsigned long cl;
+
+	DPRINTK("tcindex_delete(tp %p,arg 0x%lx),p %p,f %p\n",tp,arg,p,f);
+	if (p->perfect) {
+		if (!r->res.classid)
+			return -ENOENT;
+	} else {
+		int i;
+		struct tcindex_filter **walk = NULL;
+
+		for (i = 0; !f && i < p->hash; i++) {
+			for (walk = p->h+i; !f && *walk; walk = &(*walk)->next) {
+				if (&(*walk)->result == r)
+					f = *walk;
+			}
+		}
+		if (!f)
+			return -ENOENT;
+/*
+ @@@ OK?  -- No (jhs)
+Look more into it
+		tcf_tree_lock(tp); 
+*/
+		*walk = f->next;
+/*
+		tcf_tree_unlock(tp);
+*/
+	}
+	cl = __cls_set_class(&r->res.class,0);
+	if (cl)
+		tp->q->ops->cl_ops->unbind_tcf(tp->q,cl);
+#ifdef CONFIG_NET_CLS_POLICE
+	tcf_police_release(r->police);
+#endif
+	if (f)
+		kfree(f);
+	return 0;
+}
+
+
+/*
+ * There are no parameters for tcindex_init, so we overload tcindex_change
+ */
+
+
+static int tcindex_change(struct tcf_proto *tp,unsigned long base,u32 handle,
+    struct rtattr **tca,unsigned long *arg)
+{
+	struct tcindex_filter_result new_filter_result = {
+		NULL,		/* no policing */
+		{ 0,0 },	/* no classification */
+	};
+	struct rtattr *opt = tca[TCA_OPTIONS-1];
+	struct rtattr *tb[TCA_TCINDEX_MAX];
+	struct tcindex_data *p = PRIV(tp);
+	struct tcindex_filter *f;
+	struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;
+	struct tcindex_filter **walk;
+	int hash;
+	__u16 mask;
+
+	DPRINTK("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
+	    "p %p,r %p\n",tp,handle,tca,arg,opt,p,r);
+	if (arg)
+		DPRINTK("*arg = 0x%lx\n",*arg);
+	if (!opt)
+		return 0;
+	if (rtattr_parse(tb,TCA_TCINDEX_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0)
+		return -EINVAL;
+	if (!tb[TCA_TCINDEX_HASH-1]) {
+		hash = p->hash;
+	} else {
+		if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH-1]) < sizeof(int))
+			return -EINVAL;
+		hash = *(int *) RTA_DATA(tb[TCA_TCINDEX_HASH-1]);
+	}
+	if (!tb[TCA_TCINDEX_MASK-1]) {
+		mask = p->mask;
+	} else {
+		if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK-1]) < sizeof(__u16))
+			return -EINVAL;
+		mask = *(__u16 *) RTA_DATA(tb[TCA_TCINDEX_MASK-1]);
+	}
+	if (p->perfect && hash <= mask)
+		return -EBUSY;
+	if ((p->perfect || p->h) && hash > p->alloc_hash)
+		return -EBUSY;
+	p->hash = hash;
+	p->mask = mask;
+	if (tb[TCA_TCINDEX_SHIFT-1]) {
+		if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT-1]) < sizeof(__u16))
+			return -EINVAL;
+		p->shift = *(int *) RTA_DATA(tb[TCA_TCINDEX_SHIFT-1]);
+	}
+	if (tb[TCA_TCINDEX_FALL_THROUGH-1]) {
+		if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH-1]) < sizeof(int))
+			return -EINVAL;
+		p->fall_through =
+		    *(int *) RTA_DATA(tb[TCA_TCINDEX_FALL_THROUGH-1]);
+	}
+	DPRINTK("classid/police %p/%p\n",tb[TCA_TCINDEX_CLASSID-1],
+	    tb[TCA_TCINDEX_POLICE-1]);
+	if (!tb[TCA_TCINDEX_CLASSID-1] && !tb[TCA_TCINDEX_POLICE-1])
+		return 0;
+	if (!p->hash) {
+		if (p->mask < PERFECT_HASH_THRESHOLD) {
+			p->hash = p->mask+1;
+		} else {
+			p->hash = DEFAULT_HASH_SIZE;
+		}
+	}
+	if (!p->perfect && !p->h) {
+		p->alloc_hash = p->hash;
+		DPRINTK("hash %d mask %d\n",p->hash,p->mask);
+		if (p->hash > p->mask) {
+			p->perfect = kmalloc(p->hash*
+			    sizeof(struct tcindex_filter_result),GFP_KERNEL);
+			if (!p->perfect)
+				return -ENOMEM;
+			memset(p->perfect, 0,
+			       p->hash * sizeof(struct tcindex_filter_result));
+		} else {
+			p->h = kmalloc(p->hash*sizeof(struct tcindex_filter *),
+			    GFP_KERNEL);
+			if (!p->h)
+				return -ENOMEM;
+			memset(p->h, 0, p->hash*sizeof(struct tcindex_filter *));
+		}
+	}
+	if (handle > p->mask)
+		return -EINVAL;
+	if (p->perfect) {
+		r = p->perfect+handle;
+	} else {
+		r = lookup(p,handle);
+		DPRINTK("r=%p\n",r);
+		if (!r)
+			r = &new_filter_result;
+	}
+	DPRINTK("r=%p\n",r);
+	if (tb[TCA_TCINDEX_CLASSID-1]) {
+		unsigned long cl = cls_set_class(tp,&r->res.class,0);
+
+		if (cl)
+			tp->q->ops->cl_ops->unbind_tcf(tp->q,cl);
+		r->res.classid = *(__u32 *) RTA_DATA(tb[TCA_TCINDEX_CLASSID-1]);
+		r->res.class = tp->q->ops->cl_ops->bind_tcf(tp->q,base,
+							    r->res.classid);
+		if (!r->res.class) {
+			r->res.classid = 0;
+			return -ENOENT;
+		}
+        }
+#ifdef CONFIG_NET_CLS_POLICE
+	if (!tb[TCA_TCINDEX_POLICE-1]) {
+		r->police = NULL;
+	} else {
+		struct tcf_police *police =
+		    tcf_police_locate(tb[TCA_TCINDEX_POLICE-1],NULL);
+
+                tcf_tree_lock(tp);
+		police = xchg(&r->police,police);
+                tcf_tree_unlock(tp);
+		tcf_police_release(police);
+        }
+#endif
+	if (r != &new_filter_result)
+		return 0;
+	f = kmalloc(sizeof(struct tcindex_filter),GFP_KERNEL);
+	if (!f)
+		return -ENOMEM;
+	f->key = handle;
+	f->result = new_filter_result;
+	f->next = NULL;
+	for (walk = p->h+(handle % p->hash); *walk; walk = &(*walk)->next)
+		/* nothing */;
+	wmb();
+	*walk = f;
+	return 0;
+}
+
+
+static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
+{
+	struct tcindex_data *p = PRIV(tp);
+	struct tcindex_filter *f;
+	int i;
+
+	DPRINTK("tcindex_walk(tp %p,walker %p),p %p\n",tp,walker,p);
+	if (p->perfect) {
+		for (i = 0; i < p->hash; i++) {
+			if (!p->perfect[i].res.classid)
+				continue;
+			if (walker->count >= walker->skip) {
+				if (walker->fn(tp,
+				    (unsigned long) (p->perfect+i), walker)
+				     < 0) {
+					walker->stop = 1;
+					return;
+				}
+			}
+			walker->count++;
+		}
+	}
+	if (!p->h)
+		return;
+	for (i = 0; i < p->hash; i++) {
+		for (f = p->h[i]; f; f = f->next) {
+			if (walker->count >= walker->skip) {
+				if (walker->fn(tp,(unsigned long) &f->result,
+				    walker) < 0) {
+					walker->stop = 1;
+					return;
+				}
+			}
+			walker->count++;
+		}
+	}
+}
+
+
+static int tcindex_destroy_element(struct tcf_proto *tp,
+    unsigned long arg, struct tcf_walker *walker)
+{
+	return tcindex_delete(tp,arg);
+}
+
+
+static void tcindex_destroy(struct tcf_proto *tp)
+{
+	struct tcindex_data *p = PRIV(tp);
+	struct tcf_walker walker;
+
+	DPRINTK("tcindex_destroy(tp %p),p %p\n",tp,p);
+	walker.count = 0;
+	walker.skip = 0;
+	walker.fn = &tcindex_destroy_element;
+	tcindex_walk(tp,&walker);
+	if (p->perfect)
+		kfree(p->perfect);
+	if (p->h)
+		kfree(p->h);
+	kfree(p);
+	tp->root = NULL;
+	MOD_DEC_USE_COUNT;
+}
+
+
+#ifdef CONFIG_RTNETLINK
+
+static int tcindex_dump(struct tcf_proto *tp, unsigned long fh,
+    struct sk_buff *skb, struct tcmsg *t)
+{
+	struct tcindex_data *p = PRIV(tp);
+	struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh;
+	unsigned char *b = skb->tail;
+	struct rtattr *rta;
+
+	DPRINTK("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n",
+	    tp,fh,skb,t,p,r,b);
+	DPRINTK("p->perfect %p p->h %p\n",p->perfect,p->h);
+	rta = (struct rtattr *) b;
+	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
+	if (!fh) {
+		t->tcm_handle = ~0; /* whatever ... */
+		RTA_PUT(skb,TCA_TCINDEX_HASH,sizeof(p->hash),&p->hash);
+		RTA_PUT(skb,TCA_TCINDEX_MASK,sizeof(p->mask),&p->mask);
+		RTA_PUT(skb,TCA_TCINDEX_SHIFT,sizeof(p->shift),&p->shift);
+		RTA_PUT(skb,TCA_TCINDEX_FALL_THROUGH,sizeof(p->fall_through),
+		    &p->fall_through);
+	} else {
+		if (p->perfect) {
+			t->tcm_handle = r-p->perfect;
+		} else {
+			struct tcindex_filter *f;
+			int i;
+
+			t->tcm_handle = 0;
+			for (i = 0; !t->tcm_handle && i < p->hash; i++) {
+				for (f = p->h[i]; !t->tcm_handle && f;
+				     f = f->next) {
+					if (&f->result == r)
+						t->tcm_handle = f->key;
+				}
+			}
+		}
+		DPRINTK("handle = %d\n",t->tcm_handle);
+		if (r->res.class)
+			RTA_PUT(skb, TCA_TCINDEX_CLASSID, 4, &r->res.classid);
+#ifdef CONFIG_NET_CLS_POLICE
+		if (r->police) {
+			struct rtattr *p_rta = (struct rtattr *) skb->tail;
+
+			RTA_PUT(skb,TCA_TCINDEX_POLICE,0,NULL);
+			if (tcf_police_dump(skb,r->police) < 0)
+				goto rtattr_failure;
+			p_rta->rta_len = skb->tail-(u8 *) p_rta;
+		}
+#endif
+	}
+	rta->rta_len = skb->tail-b;
+	return skb->len;
+
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+#endif
+
+
+struct tcf_proto_ops cls_tcindex_ops = {
+	NULL,
+	"tcindex",
+	tcindex_classify,
+	tcindex_init,
+	tcindex_destroy,
+
+	tcindex_get,
+	tcindex_put,
+	tcindex_change,
+	tcindex_delete,
+	tcindex_walk,
+#ifdef CONFIG_RTNETLINK
+	tcindex_dump
+#else
+	NULL
+#endif
+};
+
+
+#ifdef MODULE
+int init_module(void)
+{
+	return register_tcf_proto_ops(&cls_tcindex_ops);
+}
+
+void cleanup_module(void) 
+{
+	unregister_tcf_proto_ops(&cls_tcindex_ops);
+}
+#endif