Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 706 insertions, 0 deletions

diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
new file mode 100644
index 000000000..4a981ca90
--- /dev/null
+++ b/net/sched/sch_atm.c
@@ -0,0 +1,706 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
+
+/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/atmdev.h>
+#include <linux/atmclip.h>
+#include <linux/rtnetlink.h>
+#include <linux/file.h>		/* for fput */
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+
+/*
+ * The ATM queuing discipline provides a framework for invoking classifiers
+ * (aka "filters"), which in turn select classes of this queuing discipline.
+ * Each class maps the flow(s) it is handling to a given VC. Multiple classes
+ * may share the same VC.
+ *
+ * When creating a class, VCs are specified by passing the number of the open
+ * socket descriptor by which the calling process references the VC. The kernel
+ * keeps the VC open at least until all classes using it are removed.
+ *
+ * In this file, most functions are named atm_tc_* to avoid confusion with all
+ * the atm_* in net/atm. This naming convention differs from what's used in the
+ * rest of net/sched.
+ *
+ * Known bugs:
+ *  - sometimes messes up the IP stack
+ *  - any manipulations besides the few operations described in the README, are
+ *    untested and likely to crash the system
+ *  - should lock the flow while there is data in the queue (?)
+ */
+
+#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
+
+struct atm_flow_data {
+	struct Qdisc_class_common common;
+	struct Qdisc		*q;	/* FIFO, TBF, etc. */
+	struct tcf_proto __rcu	*filter_list;
+	struct tcf_block	*block;
+	struct atm_vcc		*vcc;	/* VCC; NULL if VCC is closed */
+	void			(*old_pop)(struct atm_vcc *vcc,
+					   struct sk_buff *skb); /* chaining */
+	struct atm_qdisc_data	*parent;	/* parent qdisc */
+	struct socket		*sock;		/* for closing */
+	int			ref;		/* reference count */
+	struct gnet_stats_basic_sync	bstats;
+	struct gnet_stats_queue	qstats;
+	struct list_head	list;
+	struct atm_flow_data	*excess;	/* flow for excess traffic;
+						   NULL to set CLP instead */
+	int			hdr_len;
+	unsigned char		hdr[];		/* header data; MUST BE LAST */
+};
+
+struct atm_qdisc_data {
+	struct atm_flow_data	link;		/* unclassified skbs go here */
+	struct list_head	flows;		/* NB: "link" is also on this
+						   list */
+	struct tasklet_struct	task;		/* dequeue tasklet */
+};
+
+/* ------------------------- Class/flow operations ------------------------- */
+
+static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	list_for_each_entry(flow, &p->flows, list) {
+		if (flow->common.classid == classid)
+			return flow;
+	}
+	return NULL;
+}
+
+static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
+			struct Qdisc *new, struct Qdisc **old,
+			struct netlink_ext_ack *extack)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
+
+	pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
+		sch, p, flow, new, old);
+	if (list_empty(&flow->list))
+		return -EINVAL;
+	if (!new)
+		new = &noop_qdisc;
+	*old = flow->q;
+	flow->q = new;
+	if (*old)
+		qdisc_reset(*old);
+	return 0;
+}
+
+static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
+{
+	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
+
+	pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
+	return flow ? flow->q : NULL;
+}
+
+static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
+{
+	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
+	flow = lookup_flow(sch, classid);
+	pr_debug("%s: flow %p\n", __func__, flow);
+	return (unsigned long)flow;
+}
+
+static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
+					unsigned long parent, u32 classid)
+{
+	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
+	flow = lookup_flow(sch, classid);
+	if (flow)
+		flow->ref++;
+	pr_debug("%s: flow %p\n", __func__, flow);
+	return (unsigned long)flow;
+}
+
+/*
+ * atm_tc_put handles all destructions, including the ones that are explicitly
+ * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
+ * anything that still seems to be in use.
+ */
+static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
+
+	pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
+	if (--flow->ref)
+		return;
+	pr_debug("atm_tc_put: destroying\n");
+	list_del_init(&flow->list);
+	pr_debug("atm_tc_put: qdisc %p\n", flow->q);
+	qdisc_put(flow->q);
+	tcf_block_put(flow->block);
+	if (flow->sock) {
+		pr_debug("atm_tc_put: f_count %ld\n",
+			file_count(flow->sock->file));
+		flow->vcc->pop = flow->old_pop;
+		sockfd_put(flow->sock);
+	}
+	if (flow->excess)
+		atm_tc_put(sch, (unsigned long)flow->excess);
+	if (flow != &p->link)
+		kfree(flow);
+	/*
+	 * If flow == &p->link, the qdisc no longer works at this point and
+	 * needs to be removed. (By the caller of atm_tc_put.)
+	 */
+}
+
+static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
+{
+	struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
+
+	pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
+	VCC2FLOW(vcc)->old_pop(vcc, skb);
+	tasklet_schedule(&p->task);
+}
+
+static const u8 llc_oui_ip[] = {
+	0xaa,			/* DSAP: non-ISO */
+	0xaa,			/* SSAP: non-ISO */
+	0x03,			/* Ctrl: Unnumbered Information Command PDU */
+	0x00,			/* OUI: EtherType */
+	0x00, 0x00,
+	0x08, 0x00
+};				/* Ethertype IP (0800) */
+
+static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
+	[TCA_ATM_FD]		= { .type = NLA_U32 },
+	[TCA_ATM_EXCESS]	= { .type = NLA_U32 },
+};
+
+static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
+			 struct nlattr **tca, unsigned long *arg,
+			 struct netlink_ext_ack *extack)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
+	struct atm_flow_data *excess = NULL;
+	struct nlattr *opt = tca[TCA_OPTIONS];
+	struct nlattr *tb[TCA_ATM_MAX + 1];
+	struct socket *sock;
+	int fd, error, hdr_len;
+	void *hdr;
+
+	pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
+		"flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
+	/*
+	 * The concept of parents doesn't apply for this qdisc.
+	 */
+	if (parent && parent != TC_H_ROOT && parent != sch->handle)
+		return -EINVAL;
+	/*
+	 * ATM classes cannot be changed. In order to change properties of the
+	 * ATM connection, that socket needs to be modified directly (via the
+	 * native ATM API. In order to send a flow to a different VC, the old
+	 * class needs to be removed and a new one added. (This may be changed
+	 * later.)
+	 */
+	if (flow)
+		return -EBUSY;
+	if (opt == NULL)
+		return -EINVAL;
+
+	error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
+					    NULL);
+	if (error < 0)
+		return error;
+
+	if (!tb[TCA_ATM_FD])
+		return -EINVAL;
+	fd = nla_get_u32(tb[TCA_ATM_FD]);
+	pr_debug("atm_tc_change: fd %d\n", fd);
+	if (tb[TCA_ATM_HDR]) {
+		hdr_len = nla_len(tb[TCA_ATM_HDR]);
+		hdr = nla_data(tb[TCA_ATM_HDR]);
+	} else {
+		hdr_len = RFC1483LLC_LEN;
+		hdr = NULL;	/* default LLC/SNAP for IP */
+	}
+	if (!tb[TCA_ATM_EXCESS])
+		excess = NULL;
+	else {
+		excess = (struct atm_flow_data *)
+			atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
+		if (!excess)
+			return -ENOENT;
+	}
+	pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
+		 opt->nla_type, nla_len(opt), hdr_len);
+	sock = sockfd_lookup(fd, &error);
+	if (!sock)
+		return error;	/* f_count++ */
+	pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
+	if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
+		error = -EPROTOTYPE;
+		goto err_out;
+	}
+	/* @@@ should check if the socket is really operational or we'll crash
+	   on vcc->send */
+	if (classid) {
+		if (TC_H_MAJ(classid ^ sch->handle)) {
+			pr_debug("atm_tc_change: classid mismatch\n");
+			error = -EINVAL;
+			goto err_out;
+		}
+	} else {
+		int i;
+		unsigned long cl;
+
+		for (i = 1; i < 0x8000; i++) {
+			classid = TC_H_MAKE(sch->handle, 0x8000 | i);
+			cl = atm_tc_find(sch, classid);
+			if (!cl)
+				break;
+		}
+	}
+	pr_debug("atm_tc_change: new id %x\n", classid);
+	flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
+	pr_debug("atm_tc_change: flow %p\n", flow);
+	if (!flow) {
+		error = -ENOBUFS;
+		goto err_out;
+	}
+
+	error = tcf_block_get(&flow->block, &flow->filter_list, sch,
+			      extack);
+	if (error) {
+		kfree(flow);
+		goto err_out;
+	}
+
+	flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
+				    extack);
+	if (!flow->q)
+		flow->q = &noop_qdisc;
+	pr_debug("atm_tc_change: qdisc %p\n", flow->q);
+	flow->sock = sock;
+	flow->vcc = ATM_SD(sock);	/* speedup */
+	flow->vcc->user_back = flow;
+	pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
+	flow->old_pop = flow->vcc->pop;
+	flow->parent = p;
+	flow->vcc->pop = sch_atm_pop;
+	flow->common.classid = classid;
+	flow->ref = 1;
+	flow->excess = excess;
+	list_add(&flow->list, &p->link.list);
+	flow->hdr_len = hdr_len;
+	if (hdr)
+		memcpy(flow->hdr, hdr, hdr_len);
+	else
+		memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
+	*arg = (unsigned long)flow;
+	return 0;
+err_out:
+	sockfd_put(sock);
+	return error;
+}
+
+static int atm_tc_delete(struct Qdisc *sch, unsigned long arg,
+			 struct netlink_ext_ack *extack)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
+
+	pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
+	if (list_empty(&flow->list))
+		return -EINVAL;
+	if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
+		return -EBUSY;
+	/*
+	 * Reference count must be 2: one for "keepalive" (set at class
+	 * creation), and one for the reference held when calling delete.
+	 */
+	if (flow->ref < 2) {
+		pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
+		return -EINVAL;
+	}
+	if (flow->ref > 2)
+		return -EBUSY;	/* catch references via excess, etc. */
+	atm_tc_put(sch, arg);
+	return 0;
+}
+
+static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
+	if (walker->stop)
+		return;
+	list_for_each_entry(flow, &p->flows, list) {
+		if (!tc_qdisc_stats_dump(sch, (unsigned long)flow, walker))
+			break;
+	}
+}
+
+static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl,
+					  struct netlink_ext_ack *extack)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
+
+	pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
+	return flow ? flow->block : p->link.block;
+}
+
+/* --------------------------- Qdisc operations ---------------------------- */
+
+static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
+			  struct sk_buff **to_free)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+	struct tcf_result res;
+	int result;
+	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
+
+	pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
+	result = TC_ACT_OK;	/* be nice to gcc */
+	flow = NULL;
+	if (TC_H_MAJ(skb->priority) != sch->handle ||
+	    !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
+		struct tcf_proto *fl;
+
+		list_for_each_entry(flow, &p->flows, list) {
+			fl = rcu_dereference_bh(flow->filter_list);
+			if (fl) {
+				result = tcf_classify(skb, NULL, fl, &res, true);
+				if (result < 0)
+					continue;
+				if (result == TC_ACT_SHOT)
+					goto done;
+
+				flow = (struct atm_flow_data *)res.class;
+				if (!flow)
+					flow = lookup_flow(sch, res.classid);
+				goto drop;
+			}
+		}
+		flow = NULL;
+done:
+		;
+	}
+	if (!flow) {
+		flow = &p->link;
+	} else {
+		if (flow->vcc)
+			ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
+		/*@@@ looks good ... but it's not supposed to work :-) */
+#ifdef CONFIG_NET_CLS_ACT
+		switch (result) {
+		case TC_ACT_QUEUED:
+		case TC_ACT_STOLEN:
+		case TC_ACT_TRAP:
+			__qdisc_drop(skb, to_free);
+			return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
+		case TC_ACT_SHOT:
+			__qdisc_drop(skb, to_free);
+			goto drop;
+		case TC_ACT_RECLASSIFY:
+			if (flow->excess)
+				flow = flow->excess;
+			else
+				ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
+			break;
+		}
+#endif
+	}
+
+	ret = qdisc_enqueue(skb, flow->q, to_free);
+	if (ret != NET_XMIT_SUCCESS) {
+drop: __maybe_unused
+		if (net_xmit_drop_count(ret)) {
+			qdisc_qstats_drop(sch);
+			if (flow)
+				flow->qstats.drops++;
+		}
+		return ret;
+	}
+	/*
+	 * Okay, this may seem weird. We pretend we've dropped the packet if
+	 * it goes via ATM. The reason for this is that the outer qdisc
+	 * expects to be able to q->dequeue the packet later on if we return
+	 * success at this place. Also, sch->q.qdisc needs to reflect whether
+	 * there is a packet egligible for dequeuing or not. Note that the
+	 * statistics of the outer qdisc are necessarily wrong because of all
+	 * this. There's currently no correct solution for this.
+	 */
+	if (flow == &p->link) {
+		sch->q.qlen++;
+		return NET_XMIT_SUCCESS;
+	}
+	tasklet_schedule(&p->task);
+	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
+}
+
+/*
+ * Dequeue packets and send them over ATM. Note that we quite deliberately
+ * avoid checking net_device's flow control here, simply because sch_atm
+ * uses its own channels, which have nothing to do with any CLIP/LANE/or
+ * non-ATM interfaces.
+ */
+
+static void sch_atm_dequeue(struct tasklet_struct *t)
+{
+	struct atm_qdisc_data *p = from_tasklet(p, t, task);
+	struct Qdisc *sch = qdisc_from_priv(p);
+	struct atm_flow_data *flow;
+	struct sk_buff *skb;
+
+	pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
+	list_for_each_entry(flow, &p->flows, list) {
+		if (flow == &p->link)
+			continue;
+		/*
+		 * If traffic is properly shaped, this won't generate nasty
+		 * little bursts. Otherwise, it may ... (but that's okay)
+		 */
+		while ((skb = flow->q->ops->peek(flow->q))) {
+			if (!atm_may_send(flow->vcc, skb->truesize))
+				break;
+
+			skb = qdisc_dequeue_peeked(flow->q);
+			if (unlikely(!skb))
+				break;
+
+			qdisc_bstats_update(sch, skb);
+			bstats_update(&flow->bstats, skb);
+			pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
+			/* remove any LL header somebody else has attached */
+			skb_pull(skb, skb_network_offset(skb));
+			if (skb_headroom(skb) < flow->hdr_len) {
+				struct sk_buff *new;
+
+				new = skb_realloc_headroom(skb, flow->hdr_len);
+				dev_kfree_skb(skb);
+				if (!new)
+					continue;
+				skb = new;
+			}
+			pr_debug("sch_atm_dequeue: ip %p, data %p\n",
+				 skb_network_header(skb), skb->data);
+			ATM_SKB(skb)->vcc = flow->vcc;
+			memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
+			       flow->hdr_len);
+			refcount_add(skb->truesize,
+				   &sk_atm(flow->vcc)->sk_wmem_alloc);
+			/* atm.atm_options are already set by atm_tc_enqueue */
+			flow->vcc->send(flow->vcc, skb);
+		}
+	}
+}
+
+static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct sk_buff *skb;
+
+	pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
+	tasklet_schedule(&p->task);
+	skb = qdisc_dequeue_peeked(p->link.q);
+	if (skb)
+		sch->q.qlen--;
+	return skb;
+}
+
+static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+
+	pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
+
+	return p->link.q->ops->peek(p->link.q);
+}
+
+static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt,
+		       struct netlink_ext_ack *extack)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	int err;
+
+	pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
+	INIT_LIST_HEAD(&p->flows);
+	INIT_LIST_HEAD(&p->link.list);
+	gnet_stats_basic_sync_init(&p->link.bstats);
+	list_add(&p->link.list, &p->flows);
+	p->link.q = qdisc_create_dflt(sch->dev_queue,
+				      &pfifo_qdisc_ops, sch->handle, extack);
+	if (!p->link.q)
+		p->link.q = &noop_qdisc;
+	pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
+	p->link.vcc = NULL;
+	p->link.sock = NULL;
+	p->link.common.classid = sch->handle;
+	p->link.ref = 1;
+
+	err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
+			    extack);
+	if (err)
+		return err;
+
+	tasklet_setup(&p->task, sch_atm_dequeue);
+	return 0;
+}
+
+static void atm_tc_reset(struct Qdisc *sch)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
+	list_for_each_entry(flow, &p->flows, list)
+		qdisc_reset(flow->q);
+}
+
+static void atm_tc_destroy(struct Qdisc *sch)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow, *tmp;
+
+	pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
+	list_for_each_entry(flow, &p->flows, list) {
+		tcf_block_put(flow->block);
+		flow->block = NULL;
+	}
+
+	list_for_each_entry_safe(flow, tmp, &p->flows, list) {
+		if (flow->ref > 1)
+			pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
+		atm_tc_put(sch, (unsigned long)flow);
+	}
+	tasklet_kill(&p->task);
+}
+
+static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
+			     struct sk_buff *skb, struct tcmsg *tcm)
+{
+	struct atm_qdisc_data *p = qdisc_priv(sch);
+	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
+	struct nlattr *nest;
+
+	pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
+		sch, p, flow, skb, tcm);
+	if (list_empty(&flow->list))
+		return -EINVAL;
+	tcm->tcm_handle = flow->common.classid;
+	tcm->tcm_info = flow->q->handle;
+
+	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
+	if (nest == NULL)
+		goto nla_put_failure;
+
+	if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
+		goto nla_put_failure;
+	if (flow->vcc) {
+		struct sockaddr_atmpvc pvc;
+		int state;
+
+		memset(&pvc, 0, sizeof(pvc));
+		pvc.sap_family = AF_ATMPVC;
+		pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
+		pvc.sap_addr.vpi = flow->vcc->vpi;
+		pvc.sap_addr.vci = flow->vcc->vci;
+		if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
+			goto nla_put_failure;
+		state = ATM_VF2VS(flow->vcc->flags);
+		if (nla_put_u32(skb, TCA_ATM_STATE, state))
+			goto nla_put_failure;
+	}
+	if (flow->excess) {
+		if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
+			goto nla_put_failure;
+	} else {
+		if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
+			goto nla_put_failure;
+	}
+	return nla_nest_end(skb, nest);
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return -1;
+}
+static int
+atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
+			struct gnet_dump *d)
+{
+	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
+
+	if (gnet_stats_copy_basic(d, NULL, &flow->bstats, true) < 0 ||
+	    gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+	return 0;
+}
+
+static const struct Qdisc_class_ops atm_class_ops = {
+	.graft		= atm_tc_graft,
+	.leaf		= atm_tc_leaf,
+	.find		= atm_tc_find,
+	.change		= atm_tc_change,
+	.delete		= atm_tc_delete,
+	.walk		= atm_tc_walk,
+	.tcf_block	= atm_tc_tcf_block,
+	.bind_tcf	= atm_tc_bind_filter,
+	.unbind_tcf	= atm_tc_put,
+	.dump		= atm_tc_dump_class,
+	.dump_stats	= atm_tc_dump_class_stats,
+};
+
+static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
+	.cl_ops		= &atm_class_ops,
+	.id		= "atm",
+	.priv_size	= sizeof(struct atm_qdisc_data),
+	.enqueue	= atm_tc_enqueue,
+	.dequeue	= atm_tc_dequeue,
+	.peek		= atm_tc_peek,
+	.init		= atm_tc_init,
+	.reset		= atm_tc_reset,
+	.destroy	= atm_tc_destroy,
+	.dump		= atm_tc_dump,
+	.owner		= THIS_MODULE,
+};
+
+static int __init atm_init(void)
+{
+	return register_qdisc(&atm_qdisc_ops);
+}
+
+static void __exit atm_exit(void)
+{
+	unregister_qdisc(&atm_qdisc_ops);
+}
+
+module_init(atm_init)
+module_exit(atm_exit)
+MODULE_LICENSE("GPL");