cls_u32.c

Linux Kernel 2.6.9 for OMAP1710

}

static int u32_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;

	if (ht == NULL)
		return 0;

	if (TC_U32_KEY(ht->handle))
		return u32_delete_key(tp, (struct tc_u_knode*)ht);

	if (tp->root == ht)
		return -EINVAL;

	if (--ht->refcnt == 0)
		u32_destroy_hnode(tp, ht);

	return 0;
}

static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
{
	struct tc_u_knode *n;
	unsigned i = 0x7FF;

	for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
		if (i < TC_U32_NODE(n->handle))
			i = TC_U32_NODE(n->handle);
	i++;

	return handle|(i>0xFFF ? 0xFFF : i);
}

static int u32_set_parms(struct Qdisc *q, unsigned long base,
			 struct tc_u_hnode *ht,
			 struct tc_u_knode *n, struct rtattr **tb,
			 struct rtattr *est)
{
#ifdef CONFIG_NET_CLS_ACT
	struct tc_action *act = NULL;
	int ret;
#endif
	if (tb[TCA_U32_LINK-1]) {
		u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
		struct tc_u_hnode *ht_down = NULL;

		if (TC_U32_KEY(handle))
			return -EINVAL;

		if (handle) {
			ht_down = u32_lookup_ht(ht->tp_c, handle);

			if (ht_down == NULL)
				return -EINVAL;
			ht_down->refcnt++;
		}

		sch_tree_lock(q);
		ht_down = xchg(&n->ht_down, ht_down);
		sch_tree_unlock(q);

		if (ht_down)
			ht_down->refcnt--;
	}
	if (tb[TCA_U32_CLASSID-1]) {
		unsigned long cl;

		n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
		sch_tree_lock(q);
		cl = __cls_set_class(&n->res.class, q->ops->cl_ops->bind_tcf(q, base, n->res.classid));
		sch_tree_unlock(q);
		if (cl)
			q->ops->cl_ops->unbind_tcf(q, cl);
	}
#ifdef CONFIG_NET_CLS_ACT
	/*backward compatibility */
	if (tb[TCA_U32_POLICE-1])
	{
		act = kmalloc(sizeof(*act),GFP_KERNEL);
		if (NULL == act)
			return -ENOMEM;

		memset(act,0,sizeof(*act));
		ret = tcf_action_init_1(tb[TCA_U32_POLICE-1], est,act,"police", TCA_ACT_NOREPLACE, TCA_ACT_BIND);
		if (0 > ret){
			tcf_action_destroy(act, TCA_ACT_UNBIND);
			return ret;
		}
		act->type = TCA_OLD_COMPAT;

		sch_tree_lock(q);
		act = xchg(&n->action, act);
		sch_tree_unlock(q);

		tcf_action_destroy(act, TCA_ACT_UNBIND);

	}

	if(tb[TCA_U32_ACT-1]) {
		act = kmalloc(sizeof(*act),GFP_KERNEL);
		if (NULL == act)
			return -ENOMEM;
		memset(act,0,sizeof(*act));
		ret = tcf_action_init(tb[TCA_U32_ACT-1], est,act,NULL,TCA_ACT_NOREPLACE, TCA_ACT_BIND);
		if (0 > ret) {
			tcf_action_destroy(act, TCA_ACT_UNBIND);
			return ret;
		}

		sch_tree_lock(q);
		act = xchg(&n->action, act);
		sch_tree_unlock(q);

		tcf_action_destroy(act, TCA_ACT_UNBIND);
	}


#else
#ifdef CONFIG_NET_CLS_POLICE
	if (tb[TCA_U32_POLICE-1]) {
		struct tcf_police *police = tcf_police_locate(tb[TCA_U32_POLICE-1], est);
		sch_tree_lock(q);
		police = xchg(&n->police, police);
		sch_tree_unlock(q);
		tcf_police_release(police, TCA_ACT_UNBIND);
	}
#endif
#endif
#ifdef CONFIG_NET_CLS_IND
	n->indev[0] = 0;
	if(tb[TCA_U32_INDEV-1]) {
		struct rtattr *input_dev = tb[TCA_U32_INDEV-1];
		if (RTA_PAYLOAD(input_dev) >= IFNAMSIZ) {
			printk("cls_u32: bad indev name %s\n",(char*)RTA_DATA(input_dev));
			/* should we clear state first? */
			return  -EINVAL;
		}
		sprintf(n->indev, "%s", (char*)RTA_DATA(input_dev));
		printk("got IND %s\n",n->indev);
	}
#endif

	return 0;
}

static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
		      struct rtattr **tca,
		      unsigned long *arg)
{
	struct tc_u_common *tp_c = tp->data;
	struct tc_u_hnode *ht;
	struct tc_u_knode *n;
	struct tc_u32_sel *s;
	struct rtattr *opt = tca[TCA_OPTIONS-1];
	struct rtattr *tb[TCA_U32_MAX];
	u32 htid;
	int err;

	if (opt == NULL)
		return handle ? -EINVAL : 0;

	if (rtattr_parse(tb, TCA_U32_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0)
		return -EINVAL;

	if ((n = (struct tc_u_knode*)*arg) != NULL) {
		if (TC_U32_KEY(n->handle) == 0)
			return -EINVAL;

		return u32_set_parms(tp->q, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
	}

	if (tb[TCA_U32_DIVISOR-1]) {
		unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);

		if (--divisor > 0x100)
			return -EINVAL;
		if (TC_U32_KEY(handle))
			return -EINVAL;
		if (handle == 0) {
			handle = gen_new_htid(tp->data);
			if (handle == 0)
				return -ENOMEM;
		}
		ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
		if (ht == NULL)
			return -ENOBUFS;
		memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
		ht->tp_c = tp_c;
		ht->refcnt = 0;
		ht->divisor = divisor;
		ht->handle = handle;
		ht->next = tp_c->hlist;
		tp_c->hlist = ht;
		*arg = (unsigned long)ht;
		return 0;
	}

	if (tb[TCA_U32_HASH-1]) {
		htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
			ht = tp->root;
			htid = ht->handle;
		} else {
			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
			if (ht == NULL)
				return -EINVAL;
		}
	} else {
		ht = tp->root;
		htid = ht->handle;
	}

	if (ht->divisor < TC_U32_HASH(htid))
		return -EINVAL;

	if (handle) {
		if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
			return -EINVAL;
		handle = htid | TC_U32_NODE(handle);
	} else
		handle = gen_new_kid(ht, htid);

	if (tb[TCA_U32_SEL-1] == 0 ||
	    RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
		return -EINVAL;

	s = RTA_DATA(tb[TCA_U32_SEL-1]);

	n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
	if (n == NULL)
		return -ENOBUFS;

	memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
#ifdef CONFIG_CLS_U32_PERF
	n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(__u64), GFP_KERNEL);
	if (n->pf == NULL) {
		kfree(n);
		return -ENOBUFS;
	}
	memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(__u64));
#endif

	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
	n->ht_up = ht;
	n->handle = handle;
{
	u8 i = 0;
	u32 mask = s->hmask;
	if (mask) {
		while (!(mask & 1)) {
			i++;
			mask>>=1;
		}
	}
	n->fshift = i;
}
	err = u32_set_parms(tp->q, base, ht, n, tb, tca[TCA_RATE-1]);
	if (err == 0) {
		struct tc_u_knode **ins;
		for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
			if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
				break;

		n->next = *ins;
		wmb();
		*ins = n;

		*arg = (unsigned long)n;
		return 0;
	}
#ifdef CONFIG_CLS_U32_PERF
	if (n && (NULL != n->pf))
		kfree(n->pf);
#endif
	kfree(n);
	return err;
}

static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct tc_u_common *tp_c = tp->data;
	struct tc_u_hnode *ht;
	struct tc_u_knode *n;
	unsigned h;

	if (arg->stop)
		return;

	for (ht = tp_c->hlist; ht; ht = ht->next) {
		if (arg->count >= arg->skip) {
			if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
				arg->stop = 1;
				return;
			}
		}
		arg->count++;
		for (h = 0; h <= ht->divisor; h++) {
			for (n = ht->ht[h]; n; n = n->next) {
				if (arg->count < arg->skip) {
					arg->count++;
					continue;
				}
				if (arg->fn(tp, (unsigned long)n, arg) < 0) {
					arg->stop = 1;
					return;
				}
				arg->count++;
			}
		}
	}
}

static int u32_dump(struct tcf_proto *tp, unsigned long fh,
		     struct sk_buff *skb, struct tcmsg *t)
{
	struct tc_u_knode *n = (struct tc_u_knode*)fh;
	unsigned char	 *b = skb->tail;
	struct rtattr *rta;

	if (n == NULL)
		return skb->len;

	t->tcm_handle = n->handle;

	rta = (struct rtattr*)b;
	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);

	if (TC_U32_KEY(n->handle) == 0) {
		struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
		u32 divisor = ht->divisor+1;
		RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
	} else {
		RTA_PUT(skb, TCA_U32_SEL,
			sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
			&n->sel);
		if (n->ht_up) {
			u32 htid = n->handle & 0xFFFFF000;
			RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
		}
		if (n->res.classid)
			RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
		if (n->ht_down)
			RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
#ifdef CONFIG_NET_CLS_ACT
		/* again for backward compatible mode - we want
		*  to work with both old and new modes of entering
		*  tc data even if iproute2  was newer - jhs 
		*/
		if (n->action) {
			struct rtattr * p_rta = (struct rtattr*)skb->tail;

			if (n->action->type != TCA_OLD_COMPAT) {
				RTA_PUT(skb, TCA_U32_ACT, 0, NULL);
				if (tcf_action_dump(skb,n->action, 0, 0) < 0) {
					goto rtattr_failure;
				}
			} else {
				RTA_PUT(skb, TCA_U32_POLICE, 0, NULL);
				if (tcf_action_dump_old(skb,n->action,0,0) < 0) {
					goto rtattr_failure;
				}
			}

			p_rta->rta_len = skb->tail - (u8*)p_rta;
		}

#else
#ifdef CONFIG_NET_CLS_POLICE
		if (n->police) {
			struct rtattr * p_rta = (struct rtattr*)skb->tail;
			RTA_PUT(skb, TCA_U32_POLICE, 0, NULL);
	 
			if (tcf_police_dump(skb, n->police) < 0)
				goto rtattr_failure;

			p_rta->rta_len = skb->tail - (u8*)p_rta;

		}
#endif
#endif

#ifdef CONFIG_NET_CLS_IND
		if(strlen(n->indev)) {
			struct rtattr * p_rta = (struct rtattr*)skb->tail;
			RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
			p_rta->rta_len = skb->tail - (u8*)p_rta;
		}
#endif
#ifdef CONFIG_CLS_U32_PERF
		RTA_PUT(skb, TCA_U32_PCNT, 
		sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(__u64),
			n->pf);
#endif
	}

	rta->rta_len = skb->tail - b;
#ifdef CONFIG_NET_CLS_ACT
	if (TC_U32_KEY(n->handle) != 0) {
		if (TC_U32_KEY(n->handle) && n->action && n->action->type == TCA_OLD_COMPAT) {
			if (tcf_action_copy_stats(skb,n->action))
				goto rtattr_failure;
		}
	}
#else
#ifdef CONFIG_NET_CLS_POLICE
	if (TC_U32_KEY(n->handle) && n->police) {
		if (qdisc_copy_stats(skb, &n->police->stats,
				     n->police->stats_lock))
			goto rtattr_failure;
	}
#endif
#endif
	return skb->len;

rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

static struct tcf_proto_ops cls_u32_ops = {
	.next		=	NULL,
	.kind		=	"u32",
	.classify	=	u32_classify,
	.init		=	u32_init,
	.destroy	=	u32_destroy,
	.get		=	u32_get,
	.put		=	u32_put,
	.change		=	u32_change,
	.delete		=	u32_delete,
	.walk		=	u32_walk,
	.dump		=	u32_dump,
	.owner		=	THIS_MODULE,
};

static int __init init_u32(void)
{
	printk("u32 classifier\n");
#ifdef CONFIG_CLS_U32_PERF
	printk("    Perfomance counters on\n");
#endif
#ifdef CONFIG_NET_CLS_POLICE
	printk("    OLD policer on \n");
#endif
#ifdef CONFIG_NET_CLS_IND
	printk("    input device check on \n");
#endif
#ifdef CONFIG_NET_CLS_ACT
	printk("    Actions configured \n");
#endif
	return register_tcf_proto_ops(&cls_u32_ops);
}

static void __exit exit_u32(void) 
{
	unregister_tcf_proto_ops(&cls_u32_ops);
}

module_init(init_u32)
module_exit(exit_u32)
MODULE_LICENSE("GPL");