v4.19.13 snapshot.
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
new file mode 100644
index 0000000..70f144a
--- /dev/null
+++ b/net/sched/cls_api.c
@@ -0,0 +1,2265 @@
+/*
+ * net/sched/cls_api.c Packet classifier API.
+ *
+ * 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Changes:
+ *
+ * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+
+extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
+
+/* The list of all installed classifier types */
+static LIST_HEAD(tcf_proto_base);
+
+/* Protects list of registered TC modules. It is pure SMP lock. */
+static DEFINE_RWLOCK(cls_mod_lock);
+
+/* Find classifier type by string name */
+
+static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
+{
+ const struct tcf_proto_ops *t, *res = NULL;
+
+ if (kind) {
+ read_lock(&cls_mod_lock);
+ list_for_each_entry(t, &tcf_proto_base, head) {
+ if (strcmp(kind, t->kind) == 0) {
+ if (try_module_get(t->owner))
+ res = t;
+ break;
+ }
+ }
+ read_unlock(&cls_mod_lock);
+ }
+ return res;
+}
+
+static const struct tcf_proto_ops *
+tcf_proto_lookup_ops(const char *kind, struct netlink_ext_ack *extack)
+{
+ const struct tcf_proto_ops *ops;
+
+ ops = __tcf_proto_lookup_ops(kind);
+ if (ops)
+ return ops;
+#ifdef CONFIG_MODULES
+ rtnl_unlock();
+ request_module("cls_%s", kind);
+ rtnl_lock();
+ ops = __tcf_proto_lookup_ops(kind);
+ /* We dropped the RTNL semaphore in order to perform
+ * the module load. So, even if we succeeded in loading
+ * the module we have to replay the request. We indicate
+ * this using -EAGAIN.
+ */
+ if (ops) {
+ module_put(ops->owner);
+ return ERR_PTR(-EAGAIN);
+ }
+#endif
+ NL_SET_ERR_MSG(extack, "TC classifier not found");
+ return ERR_PTR(-ENOENT);
+}
+
+/* Register(unregister) new classifier type */
+
+int register_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+ struct tcf_proto_ops *t;
+ int rc = -EEXIST;
+
+ write_lock(&cls_mod_lock);
+ list_for_each_entry(t, &tcf_proto_base, head)
+ if (!strcmp(ops->kind, t->kind))
+ goto out;
+
+ list_add_tail(&ops->head, &tcf_proto_base);
+ rc = 0;
+out:
+ write_unlock(&cls_mod_lock);
+ return rc;
+}
+EXPORT_SYMBOL(register_tcf_proto_ops);
+
+static struct workqueue_struct *tc_filter_wq;
+
+int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+ struct tcf_proto_ops *t;
+ int rc = -ENOENT;
+
+ /* Wait for outstanding call_rcu()s, if any, from a
+ * tcf_proto_ops's destroy() handler.
+ */
+ rcu_barrier();
+ flush_workqueue(tc_filter_wq);
+
+ write_lock(&cls_mod_lock);
+ list_for_each_entry(t, &tcf_proto_base, head) {
+ if (t == ops) {
+ list_del(&t->head);
+ rc = 0;
+ break;
+ }
+ }
+ write_unlock(&cls_mod_lock);
+ return rc;
+}
+EXPORT_SYMBOL(unregister_tcf_proto_ops);
+
+bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
+{
+ INIT_RCU_WORK(rwork, func);
+ return queue_rcu_work(tc_filter_wq, rwork);
+}
+EXPORT_SYMBOL(tcf_queue_work);
+
+/* Select new prio value from the range, managed by kernel. */
+
+static inline u32 tcf_auto_prio(struct tcf_proto *tp)
+{
+ u32 first = TC_H_MAKE(0xC0000000U, 0U);
+
+ if (tp)
+ first = tp->prio - 1;
+
+ return TC_H_MAJ(first);
+}
+
+static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
+ u32 prio, struct tcf_chain *chain,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_proto *tp;
+ int err;
+
+ tp = kzalloc(sizeof(*tp), GFP_KERNEL);
+ if (!tp)
+ return ERR_PTR(-ENOBUFS);
+
+ tp->ops = tcf_proto_lookup_ops(kind, extack);
+ if (IS_ERR(tp->ops)) {
+ err = PTR_ERR(tp->ops);
+ goto errout;
+ }
+ tp->classify = tp->ops->classify;
+ tp->protocol = protocol;
+ tp->prio = prio;
+ tp->chain = chain;
+
+ err = tp->ops->init(tp);
+ if (err) {
+ module_put(tp->ops->owner);
+ goto errout;
+ }
+ return tp;
+
+errout:
+ kfree(tp);
+ return ERR_PTR(err);
+}
+
+static void tcf_proto_destroy(struct tcf_proto *tp,
+ struct netlink_ext_ack *extack)
+{
+ tp->ops->destroy(tp, extack);
+ module_put(tp->ops->owner);
+ kfree_rcu(tp, rcu);
+}
+
+struct tcf_filter_chain_list_item {
+ struct list_head list;
+ tcf_chain_head_change_t *chain_head_change;
+ void *chain_head_change_priv;
+};
+
+static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
+ u32 chain_index)
+{
+ struct tcf_chain *chain;
+
+ chain = kzalloc(sizeof(*chain), GFP_KERNEL);
+ if (!chain)
+ return NULL;
+ list_add_tail(&chain->list, &block->chain_list);
+ chain->block = block;
+ chain->index = chain_index;
+ chain->refcnt = 1;
+ if (!chain->index)
+ block->chain0.chain = chain;
+ return chain;
+}
+
+static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
+ struct tcf_proto *tp_head)
+{
+ if (item->chain_head_change)
+ item->chain_head_change(tp_head, item->chain_head_change_priv);
+}
+
+static void tcf_chain0_head_change(struct tcf_chain *chain,
+ struct tcf_proto *tp_head)
+{
+ struct tcf_filter_chain_list_item *item;
+ struct tcf_block *block = chain->block;
+
+ if (chain->index)
+ return;
+ list_for_each_entry(item, &block->chain0.filter_chain_list, list)
+ tcf_chain_head_change_item(item, tp_head);
+}
+
+static void tcf_chain_destroy(struct tcf_chain *chain)
+{
+ struct tcf_block *block = chain->block;
+
+ list_del(&chain->list);
+ if (!chain->index)
+ block->chain0.chain = NULL;
+ kfree(chain);
+ if (list_empty(&block->chain_list) && block->refcnt == 0)
+ kfree(block);
+}
+
+static void tcf_chain_hold(struct tcf_chain *chain)
+{
+ ++chain->refcnt;
+}
+
+static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
+{
+ /* In case all the references are action references, this
+ * chain should not be shown to the user.
+ */
+ return chain->refcnt == chain->action_refcnt;
+}
+
+static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
+ u32 chain_index)
+{
+ struct tcf_chain *chain;
+
+ list_for_each_entry(chain, &block->chain_list, list) {
+ if (chain->index == chain_index)
+ return chain;
+ }
+ return NULL;
+}
+
+static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
+ u32 seq, u16 flags, int event, bool unicast);
+
+static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
+ u32 chain_index, bool create,
+ bool by_act)
+{
+ struct tcf_chain *chain = tcf_chain_lookup(block, chain_index);
+
+ if (chain) {
+ tcf_chain_hold(chain);
+ } else {
+ if (!create)
+ return NULL;
+ chain = tcf_chain_create(block, chain_index);
+ if (!chain)
+ return NULL;
+ }
+
+ if (by_act)
+ ++chain->action_refcnt;
+
+ /* Send notification only in case we got the first
+ * non-action reference. Until then, the chain acts only as
+ * a placeholder for actions pointing to it and user ought
+ * not know about them.
+ */
+ if (chain->refcnt - chain->action_refcnt == 1 && !by_act)
+ tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
+ RTM_NEWCHAIN, false);
+
+ return chain;
+}
+
+static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
+ bool create)
+{
+ return __tcf_chain_get(block, chain_index, create, false);
+}
+
+struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
+{
+ return __tcf_chain_get(block, chain_index, true, true);
+}
+EXPORT_SYMBOL(tcf_chain_get_by_act);
+
+static void tc_chain_tmplt_del(struct tcf_chain *chain);
+
+static void __tcf_chain_put(struct tcf_chain *chain, bool by_act)
+{
+ if (by_act)
+ chain->action_refcnt--;
+ chain->refcnt--;
+
+ /* The last dropped non-action reference will trigger notification. */
+ if (chain->refcnt - chain->action_refcnt == 0 && !by_act)
+ tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false);
+
+ if (chain->refcnt == 0) {
+ tc_chain_tmplt_del(chain);
+ tcf_chain_destroy(chain);
+ }
+}
+
+static void tcf_chain_put(struct tcf_chain *chain)
+{
+ __tcf_chain_put(chain, false);
+}
+
+void tcf_chain_put_by_act(struct tcf_chain *chain)
+{
+ __tcf_chain_put(chain, true);
+}
+EXPORT_SYMBOL(tcf_chain_put_by_act);
+
+static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
+{
+ if (chain->explicitly_created)
+ tcf_chain_put(chain);
+}
+
+static void tcf_chain_flush(struct tcf_chain *chain)
+{
+ struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
+
+ tcf_chain0_head_change(chain, NULL);
+ while (tp) {
+ RCU_INIT_POINTER(chain->filter_chain, tp->next);
+ tcf_proto_destroy(tp, NULL);
+ tp = rtnl_dereference(chain->filter_chain);
+ tcf_chain_put(chain);
+ }
+}
+
+static bool tcf_block_offload_in_use(struct tcf_block *block)
+{
+ return block->offloadcnt;
+}
+
+static int tcf_block_offload_cmd(struct tcf_block *block,
+ struct net_device *dev,
+ struct tcf_block_ext_info *ei,
+ enum tc_block_command command,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_block_offload bo = {};
+
+ bo.command = command;
+ bo.binder_type = ei->binder_type;
+ bo.block = block;
+ bo.extack = extack;
+ return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
+}
+
+static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
+ struct tcf_block_ext_info *ei,
+ struct netlink_ext_ack *extack)
+{
+ struct net_device *dev = q->dev_queue->dev;
+ int err;
+
+ if (!dev->netdev_ops->ndo_setup_tc)
+ goto no_offload_dev_inc;
+
+ /* If tc offload feature is disabled and the block we try to bind
+ * to already has some offloaded filters, forbid to bind.
+ */
+ if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
+ NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
+ return -EOPNOTSUPP;
+ }
+
+ err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
+ if (err == -EOPNOTSUPP)
+ goto no_offload_dev_inc;
+ return err;
+
+no_offload_dev_inc:
+ if (tcf_block_offload_in_use(block))
+ return -EOPNOTSUPP;
+ block->nooffloaddevcnt++;
+ return 0;
+}
+
+static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
+ struct tcf_block_ext_info *ei)
+{
+ struct net_device *dev = q->dev_queue->dev;
+ int err;
+
+ if (!dev->netdev_ops->ndo_setup_tc)
+ goto no_offload_dev_dec;
+ err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
+ if (err == -EOPNOTSUPP)
+ goto no_offload_dev_dec;
+ return;
+
+no_offload_dev_dec:
+ WARN_ON(block->nooffloaddevcnt-- == 0);
+}
+
+static int
+tcf_chain0_head_change_cb_add(struct tcf_block *block,
+ struct tcf_block_ext_info *ei,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_chain *chain0 = block->chain0.chain;
+ struct tcf_filter_chain_list_item *item;
+
+ item = kmalloc(sizeof(*item), GFP_KERNEL);
+ if (!item) {
+ NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
+ return -ENOMEM;
+ }
+ item->chain_head_change = ei->chain_head_change;
+ item->chain_head_change_priv = ei->chain_head_change_priv;
+ if (chain0 && chain0->filter_chain)
+ tcf_chain_head_change_item(item, chain0->filter_chain);
+ list_add(&item->list, &block->chain0.filter_chain_list);
+ return 0;
+}
+
+static void
+tcf_chain0_head_change_cb_del(struct tcf_block *block,
+ struct tcf_block_ext_info *ei)
+{
+ struct tcf_chain *chain0 = block->chain0.chain;
+ struct tcf_filter_chain_list_item *item;
+
+ list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
+ if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
+ (item->chain_head_change == ei->chain_head_change &&
+ item->chain_head_change_priv == ei->chain_head_change_priv)) {
+ if (chain0)
+ tcf_chain_head_change_item(item, NULL);
+ list_del(&item->list);
+ kfree(item);
+ return;
+ }
+ }
+ WARN_ON(1);
+}
+
+struct tcf_net {
+ struct idr idr;
+};
+
+static unsigned int tcf_net_id;
+
+static int tcf_block_insert(struct tcf_block *block, struct net *net,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+ return idr_alloc_u32(&tn->idr, block, &block->index, block->index,
+ GFP_KERNEL);
+}
+
+static void tcf_block_remove(struct tcf_block *block, struct net *net)
+{
+ struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+ idr_remove(&tn->idr, block->index);
+}
+
+static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
+ u32 block_index,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block *block;
+
+ block = kzalloc(sizeof(*block), GFP_KERNEL);
+ if (!block) {
+ NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
+ return ERR_PTR(-ENOMEM);
+ }
+ INIT_LIST_HEAD(&block->chain_list);
+ INIT_LIST_HEAD(&block->cb_list);
+ INIT_LIST_HEAD(&block->owner_list);
+ INIT_LIST_HEAD(&block->chain0.filter_chain_list);
+
+ block->refcnt = 1;
+ block->net = net;
+ block->index = block_index;
+
+ /* Don't store q pointer for blocks which are shared */
+ if (!tcf_block_shared(block))
+ block->q = q;
+ return block;
+}
+
+static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
+{
+ struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+ return idr_find(&tn->idr, block_index);
+}
+
+/* Find tcf block.
+ * Set q, parent, cl when appropriate.
+ */
+
+static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
+ u32 *parent, unsigned long *cl,
+ int ifindex, u32 block_index,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block *block;
+
+ if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+ block = tcf_block_lookup(net, block_index);
+ if (!block) {
+ NL_SET_ERR_MSG(extack, "Block of given index was not found");
+ return ERR_PTR(-EINVAL);
+ }
+ } else {
+ const struct Qdisc_class_ops *cops;
+ struct net_device *dev;
+
+ /* Find link */
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+
+ /* Find qdisc */
+ if (!*parent) {
+ *q = dev->qdisc;
+ *parent = (*q)->handle;
+ } else {
+ *q = qdisc_lookup(dev, TC_H_MAJ(*parent));
+ if (!*q) {
+ NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ /* Is it classful? */
+ cops = (*q)->ops->cl_ops;
+ if (!cops) {
+ NL_SET_ERR_MSG(extack, "Qdisc not classful");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!cops->tcf_block) {
+ NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Do we search for filter, attached to class? */
+ if (TC_H_MIN(*parent)) {
+ *cl = cops->find(*q, *parent);
+ if (*cl == 0) {
+ NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
+ return ERR_PTR(-ENOENT);
+ }
+ }
+
+ /* And the last stroke */
+ block = cops->tcf_block(*q, *cl, extack);
+ if (!block)
+ return ERR_PTR(-EINVAL);
+ if (tcf_block_shared(block)) {
+ NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+ }
+
+ return block;
+}
+
+struct tcf_block_owner_item {
+ struct list_head list;
+ struct Qdisc *q;
+ enum tcf_block_binder_type binder_type;
+};
+
+static void
+tcf_block_owner_netif_keep_dst(struct tcf_block *block,
+ struct Qdisc *q,
+ enum tcf_block_binder_type binder_type)
+{
+ if (block->keep_dst &&
+ binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
+ binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
+ netif_keep_dst(qdisc_dev(q));
+}
+
+void tcf_block_netif_keep_dst(struct tcf_block *block)
+{
+ struct tcf_block_owner_item *item;
+
+ block->keep_dst = true;
+ list_for_each_entry(item, &block->owner_list, list)
+ tcf_block_owner_netif_keep_dst(block, item->q,
+ item->binder_type);
+}
+EXPORT_SYMBOL(tcf_block_netif_keep_dst);
+
+static int tcf_block_owner_add(struct tcf_block *block,
+ struct Qdisc *q,
+ enum tcf_block_binder_type binder_type)
+{
+ struct tcf_block_owner_item *item;
+
+ item = kmalloc(sizeof(*item), GFP_KERNEL);
+ if (!item)
+ return -ENOMEM;
+ item->q = q;
+ item->binder_type = binder_type;
+ list_add(&item->list, &block->owner_list);
+ return 0;
+}
+
+static void tcf_block_owner_del(struct tcf_block *block,
+ struct Qdisc *q,
+ enum tcf_block_binder_type binder_type)
+{
+ struct tcf_block_owner_item *item;
+
+ list_for_each_entry(item, &block->owner_list, list) {
+ if (item->q == q && item->binder_type == binder_type) {
+ list_del(&item->list);
+ kfree(item);
+ return;
+ }
+ }
+ WARN_ON(1);
+}
+
+int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
+ struct tcf_block_ext_info *ei,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = qdisc_net(q);
+ struct tcf_block *block = NULL;
+ bool created = false;
+ int err;
+
+ if (ei->block_index) {
+ /* block_index not 0 means the shared block is requested */
+ block = tcf_block_lookup(net, ei->block_index);
+ if (block)
+ block->refcnt++;
+ }
+
+ if (!block) {
+ block = tcf_block_create(net, q, ei->block_index, extack);
+ if (IS_ERR(block))
+ return PTR_ERR(block);
+ created = true;
+ if (tcf_block_shared(block)) {
+ err = tcf_block_insert(block, net, extack);
+ if (err)
+ goto err_block_insert;
+ }
+ }
+
+ err = tcf_block_owner_add(block, q, ei->binder_type);
+ if (err)
+ goto err_block_owner_add;
+
+ tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
+
+ err = tcf_chain0_head_change_cb_add(block, ei, extack);
+ if (err)
+ goto err_chain0_head_change_cb_add;
+
+ err = tcf_block_offload_bind(block, q, ei, extack);
+ if (err)
+ goto err_block_offload_bind;
+
+ *p_block = block;
+ return 0;
+
+err_block_offload_bind:
+ tcf_chain0_head_change_cb_del(block, ei);
+err_chain0_head_change_cb_add:
+ tcf_block_owner_del(block, q, ei->binder_type);
+err_block_owner_add:
+ if (created) {
+ if (tcf_block_shared(block))
+ tcf_block_remove(block, net);
+err_block_insert:
+ kfree(block);
+ } else {
+ block->refcnt--;
+ }
+ return err;
+}
+EXPORT_SYMBOL(tcf_block_get_ext);
+
+static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
+{
+ struct tcf_proto __rcu **p_filter_chain = priv;
+
+ rcu_assign_pointer(*p_filter_chain, tp_head);
+}
+
+int tcf_block_get(struct tcf_block **p_block,
+ struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block_ext_info ei = {
+ .chain_head_change = tcf_chain_head_change_dflt,
+ .chain_head_change_priv = p_filter_chain,
+ };
+
+ WARN_ON(!p_filter_chain);
+ return tcf_block_get_ext(p_block, q, &ei, extack);
+}
+EXPORT_SYMBOL(tcf_block_get);
+
+/* XXX: Standalone actions are not allowed to jump to any chain, and bound
+ * actions should be all removed after flushing.
+ */
+void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
+ struct tcf_block_ext_info *ei)
+{
+ struct tcf_chain *chain, *tmp;
+
+ if (!block)
+ return;
+ tcf_chain0_head_change_cb_del(block, ei);
+ tcf_block_owner_del(block, q, ei->binder_type);
+
+ if (block->refcnt == 1) {
+ if (tcf_block_shared(block))
+ tcf_block_remove(block, block->net);
+
+ /* Hold a refcnt for all chains, so that they don't disappear
+ * while we are iterating.
+ */
+ list_for_each_entry(chain, &block->chain_list, list)
+ tcf_chain_hold(chain);
+
+ list_for_each_entry(chain, &block->chain_list, list)
+ tcf_chain_flush(chain);
+ }
+
+ tcf_block_offload_unbind(block, q, ei);
+
+ if (block->refcnt == 1) {
+ /* At this point, all the chains should have refcnt >= 1. */
+ list_for_each_entry_safe(chain, tmp, &block->chain_list, list) {
+ tcf_chain_put_explicitly_created(chain);
+ tcf_chain_put(chain);
+ }
+
+ block->refcnt--;
+ if (list_empty(&block->chain_list))
+ kfree(block);
+ } else {
+ block->refcnt--;
+ }
+}
+EXPORT_SYMBOL(tcf_block_put_ext);
+
+void tcf_block_put(struct tcf_block *block)
+{
+ struct tcf_block_ext_info ei = {0, };
+
+ if (!block)
+ return;
+ tcf_block_put_ext(block, block->q, &ei);
+}
+
+EXPORT_SYMBOL(tcf_block_put);
+
+struct tcf_block_cb {
+ struct list_head list;
+ tc_setup_cb_t *cb;
+ void *cb_ident;
+ void *cb_priv;
+ unsigned int refcnt;
+};
+
+void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
+{
+ return block_cb->cb_priv;
+}
+EXPORT_SYMBOL(tcf_block_cb_priv);
+
+struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
+ tc_setup_cb_t *cb, void *cb_ident)
+{ struct tcf_block_cb *block_cb;
+
+ list_for_each_entry(block_cb, &block->cb_list, list)
+ if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
+ return block_cb;
+ return NULL;
+}
+EXPORT_SYMBOL(tcf_block_cb_lookup);
+
+void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
+{
+ block_cb->refcnt++;
+}
+EXPORT_SYMBOL(tcf_block_cb_incref);
+
+unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
+{
+ return --block_cb->refcnt;
+}
+EXPORT_SYMBOL(tcf_block_cb_decref);
+
+static int
+tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
+ void *cb_priv, bool add, bool offload_in_use,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_chain *chain;
+ struct tcf_proto *tp;
+ int err;
+
+ list_for_each_entry(chain, &block->chain_list, list) {
+ for (tp = rtnl_dereference(chain->filter_chain); tp;
+ tp = rtnl_dereference(tp->next)) {
+ if (tp->ops->reoffload) {
+ err = tp->ops->reoffload(tp, add, cb, cb_priv,
+ extack);
+ if (err && add)
+ goto err_playback_remove;
+ } else if (add && offload_in_use) {
+ err = -EOPNOTSUPP;
+ NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
+ goto err_playback_remove;
+ }
+ }
+ }
+
+ return 0;
+
+err_playback_remove:
+ tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
+ extack);
+ return err;
+}
+
+struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
+ tc_setup_cb_t *cb, void *cb_ident,
+ void *cb_priv,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block_cb *block_cb;
+ int err;
+
+ /* Replay any already present rules */
+ err = tcf_block_playback_offloads(block, cb, cb_priv, true,
+ tcf_block_offload_in_use(block),
+ extack);
+ if (err)
+ return ERR_PTR(err);
+
+ block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
+ if (!block_cb)
+ return ERR_PTR(-ENOMEM);
+ block_cb->cb = cb;
+ block_cb->cb_ident = cb_ident;
+ block_cb->cb_priv = cb_priv;
+ list_add(&block_cb->list, &block->cb_list);
+ return block_cb;
+}
+EXPORT_SYMBOL(__tcf_block_cb_register);
+
+int tcf_block_cb_register(struct tcf_block *block,
+ tc_setup_cb_t *cb, void *cb_ident,
+ void *cb_priv, struct netlink_ext_ack *extack)
+{
+ struct tcf_block_cb *block_cb;
+
+ block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
+ extack);
+ return PTR_ERR_OR_ZERO(block_cb);
+}
+EXPORT_SYMBOL(tcf_block_cb_register);
+
+void __tcf_block_cb_unregister(struct tcf_block *block,
+ struct tcf_block_cb *block_cb)
+{
+ tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
+ false, tcf_block_offload_in_use(block),
+ NULL);
+ list_del(&block_cb->list);
+ kfree(block_cb);
+}
+EXPORT_SYMBOL(__tcf_block_cb_unregister);
+
+void tcf_block_cb_unregister(struct tcf_block *block,
+ tc_setup_cb_t *cb, void *cb_ident)
+{
+ struct tcf_block_cb *block_cb;
+
+ block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
+ if (!block_cb)
+ return;
+ __tcf_block_cb_unregister(block, block_cb);
+}
+EXPORT_SYMBOL(tcf_block_cb_unregister);
+
+static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
+ void *type_data, bool err_stop)
+{
+ struct tcf_block_cb *block_cb;
+ int ok_count = 0;
+ int err;
+
+ /* Make sure all netdevs sharing this block are offload-capable. */
+ if (block->nooffloaddevcnt && err_stop)
+ return -EOPNOTSUPP;
+
+ list_for_each_entry(block_cb, &block->cb_list, list) {
+ err = block_cb->cb(type, type_data, block_cb->cb_priv);
+ if (err) {
+ if (err_stop)
+ return err;
+ } else {
+ ok_count++;
+ }
+ }
+ return ok_count;
+}
+
+/* Main classifier routine: scans classifier chain attached
+ * to this qdisc, (optionally) tests for protocol and asks
+ * specific classifiers.
+ */
+int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+ struct tcf_result *res, bool compat_mode)
+{
+ __be16 protocol = tc_skb_protocol(skb);
+#ifdef CONFIG_NET_CLS_ACT
+ const int max_reclassify_loop = 4;
+ const struct tcf_proto *orig_tp = tp;
+ const struct tcf_proto *first_tp;
+ int limit = 0;
+
+reclassify:
+#endif
+ for (; tp; tp = rcu_dereference_bh(tp->next)) {
+ int err;
+
+ if (tp->protocol != protocol &&
+ tp->protocol != htons(ETH_P_ALL))
+ continue;
+
+ err = tp->classify(skb, tp, res);
+#ifdef CONFIG_NET_CLS_ACT
+ if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
+ first_tp = orig_tp;
+ goto reset;
+ } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
+ first_tp = res->goto_tp;
+ goto reset;
+ }
+#endif
+ if (err >= 0)
+ return err;
+ }
+
+ return TC_ACT_UNSPEC; /* signal: continue lookup */
+#ifdef CONFIG_NET_CLS_ACT
+reset:
+ if (unlikely(limit++ >= max_reclassify_loop)) {
+ net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
+ tp->chain->block->index,
+ tp->prio & 0xffff,
+ ntohs(tp->protocol));
+ return TC_ACT_SHOT;
+ }
+
+ tp = first_tp;
+ protocol = tc_skb_protocol(skb);
+ goto reclassify;
+#endif
+}
+EXPORT_SYMBOL(tcf_classify);
+
+struct tcf_chain_info {
+ struct tcf_proto __rcu **pprev;
+ struct tcf_proto __rcu *next;
+};
+
+static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
+{
+ return rtnl_dereference(*chain_info->pprev);
+}
+
+static void tcf_chain_tp_insert(struct tcf_chain *chain,
+ struct tcf_chain_info *chain_info,
+ struct tcf_proto *tp)
+{
+ if (*chain_info->pprev == chain->filter_chain)
+ tcf_chain0_head_change(chain, tp);
+ RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
+ rcu_assign_pointer(*chain_info->pprev, tp);
+ tcf_chain_hold(chain);
+}
+
+static void tcf_chain_tp_remove(struct tcf_chain *chain,
+ struct tcf_chain_info *chain_info,
+ struct tcf_proto *tp)
+{
+ struct tcf_proto *next = rtnl_dereference(chain_info->next);
+
+ if (tp == chain->filter_chain)
+ tcf_chain0_head_change(chain, next);
+ RCU_INIT_POINTER(*chain_info->pprev, next);
+ tcf_chain_put(chain);
+}
+
+static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
+ struct tcf_chain_info *chain_info,
+ u32 protocol, u32 prio,
+ bool prio_allocate)
+{
+ struct tcf_proto **pprev;
+ struct tcf_proto *tp;
+
+ /* Check the chain for existence of proto-tcf with this priority */
+ for (pprev = &chain->filter_chain;
+ (tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
+ if (tp->prio >= prio) {
+ if (tp->prio == prio) {
+ if (prio_allocate ||
+ (tp->protocol != protocol && protocol))
+ return ERR_PTR(-EINVAL);
+ } else {
+ tp = NULL;
+ }
+ break;
+ }
+ }
+ chain_info->pprev = pprev;
+ chain_info->next = tp ? tp->next : NULL;
+ return tp;
+}
+
+static int tcf_fill_node(struct net *net, struct sk_buff *skb,
+ struct tcf_proto *tp, struct tcf_block *block,
+ struct Qdisc *q, u32 parent, void *fh,
+ u32 portid, u32 seq, u16 flags, int event)
+{
+ struct tcmsg *tcm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb_tail_pointer(skb);
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
+ if (!nlh)
+ goto out_nlmsg_trim;
+ tcm = nlmsg_data(nlh);
+ tcm->tcm_family = AF_UNSPEC;
+ tcm->tcm__pad1 = 0;
+ tcm->tcm__pad2 = 0;
+ if (q) {
+ tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
+ tcm->tcm_parent = parent;
+ } else {
+ tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
+ tcm->tcm_block_index = block->index;
+ }
+ tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
+ if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
+ goto nla_put_failure;
+ if (!fh) {
+ tcm->tcm_handle = 0;
+ } else {
+ if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
+ goto nla_put_failure;
+ }
+ nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+ return skb->len;
+
+out_nlmsg_trim:
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static int tfilter_notify(struct net *net, struct sk_buff *oskb,
+ struct nlmsghdr *n, struct tcf_proto *tp,
+ struct tcf_block *block, struct Qdisc *q,
+ u32 parent, void *fh, int event, bool unicast)
+{
+ struct sk_buff *skb;
+ u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
+ n->nlmsg_seq, n->nlmsg_flags, event) <= 0) {
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ if (unicast)
+ return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
+
+ return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+ n->nlmsg_flags & NLM_F_ECHO);
+}
+
+static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
+ struct nlmsghdr *n, struct tcf_proto *tp,
+ struct tcf_block *block, struct Qdisc *q,
+ u32 parent, void *fh, bool unicast, bool *last,
+ struct netlink_ext_ack *extack)
+{
+ struct sk_buff *skb;
+ u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+ int err;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
+ n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
+ NL_SET_ERR_MSG(extack, "Failed to build del event notification");
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ err = tp->ops->delete(tp, fh, last, extack);
+ if (err) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ if (unicast)
+ return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
+
+ err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+ n->nlmsg_flags & NLM_F_ECHO);
+ if (err < 0)
+ NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
+ return err;
+}
+
+static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
+ struct tcf_block *block, struct Qdisc *q,
+ u32 parent, struct nlmsghdr *n,
+ struct tcf_chain *chain, int event)
+{
+ struct tcf_proto *tp;
+
+ for (tp = rtnl_dereference(chain->filter_chain);
+ tp; tp = rtnl_dereference(tp->next))
+ tfilter_notify(net, oskb, n, tp, block,
+ q, parent, NULL, event, false);
+}
+
+static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct tcmsg *t;
+ u32 protocol;
+ u32 prio;
+ bool prio_allocate;
+ u32 parent;
+ u32 chain_index;
+ struct Qdisc *q = NULL;
+ struct tcf_chain_info chain_info;
+ struct tcf_chain *chain = NULL;
+ struct tcf_block *block;
+ struct tcf_proto *tp;
+ unsigned long cl;
+ void *fh;
+ int err;
+ int tp_created;
+
+ if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+replay:
+ tp_created = 0;
+
+ err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
+ if (err < 0)
+ return err;
+
+ t = nlmsg_data(n);
+ protocol = TC_H_MIN(t->tcm_info);
+ prio = TC_H_MAJ(t->tcm_info);
+ prio_allocate = false;
+ parent = t->tcm_parent;
+ cl = 0;
+
+ if (prio == 0) {
+ /* If no priority is provided by the user,
+ * we allocate one.
+ */
+ if (n->nlmsg_flags & NLM_F_CREATE) {
+ prio = TC_H_MAKE(0x80000000U, 0U);
+ prio_allocate = true;
+ } else {
+ NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
+ return -ENOENT;
+ }
+ }
+
+ /* Find head of filter chain. */
+
+ block = tcf_block_find(net, &q, &parent, &cl,
+ t->tcm_ifindex, t->tcm_block_index, extack);
+ if (IS_ERR(block)) {
+ err = PTR_ERR(block);
+ goto errout;
+ }
+
+ chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+ if (chain_index > TC_ACT_EXT_VAL_MASK) {
+ NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+ err = -EINVAL;
+ goto errout;
+ }
+ chain = tcf_chain_get(block, chain_index, true);
+ if (!chain) {
+ NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
+ err = -ENOMEM;
+ goto errout;
+ }
+
+ tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+ prio, prio_allocate);
+ if (IS_ERR(tp)) {
+ NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+ err = PTR_ERR(tp);
+ goto errout;
+ }
+
+ if (tp == NULL) {
+ /* Proto-tcf does not exist, create new one */
+
+ if (tca[TCA_KIND] == NULL || !protocol) {
+ NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+ NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
+ err = -ENOENT;
+ goto errout;
+ }
+
+ if (prio_allocate)
+ prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
+
+ tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
+ protocol, prio, chain, extack);
+ if (IS_ERR(tp)) {
+ err = PTR_ERR(tp);
+ goto errout;
+ }
+ tp_created = 1;
+ } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+ NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ fh = tp->ops->get(tp, t->tcm_handle);
+
+ if (!fh) {
+ if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+ NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
+ err = -ENOENT;
+ goto errout;
+ }
+ } else if (n->nlmsg_flags & NLM_F_EXCL) {
+ NL_SET_ERR_MSG(extack, "Filter already exists");
+ err = -EEXIST;
+ goto errout;
+ }
+
+ if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
+ NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
+ n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
+ extack);
+ if (err == 0) {
+ if (tp_created)
+ tcf_chain_tp_insert(chain, &chain_info, tp);
+ tfilter_notify(net, skb, n, tp, block, q, parent, fh,
+ RTM_NEWTFILTER, false);
+ } else {
+ if (tp_created)
+ tcf_proto_destroy(tp, NULL);
+ }
+
+errout:
+ if (chain)
+ tcf_chain_put(chain);
+ if (err == -EAGAIN)
+ /* Replay the request. */
+ goto replay;
+ return err;
+}
+
+static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct tcmsg *t;
+ u32 protocol;
+ u32 prio;
+ u32 parent;
+ u32 chain_index;
+ struct Qdisc *q = NULL;
+ struct tcf_chain_info chain_info;
+ struct tcf_chain *chain = NULL;
+ struct tcf_block *block;
+ struct tcf_proto *tp = NULL;
+ unsigned long cl = 0;
+ void *fh = NULL;
+ int err;
+
+ if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
+ if (err < 0)
+ return err;
+
+ t = nlmsg_data(n);
+ protocol = TC_H_MIN(t->tcm_info);
+ prio = TC_H_MAJ(t->tcm_info);
+ parent = t->tcm_parent;
+
+ if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
+ NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
+ return -ENOENT;
+ }
+
+ /* Find head of filter chain. */
+
+ block = tcf_block_find(net, &q, &parent, &cl,
+ t->tcm_ifindex, t->tcm_block_index, extack);
+ if (IS_ERR(block)) {
+ err = PTR_ERR(block);
+ goto errout;
+ }
+
+ chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+ if (chain_index > TC_ACT_EXT_VAL_MASK) {
+ NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+ err = -EINVAL;
+ goto errout;
+ }
+ chain = tcf_chain_get(block, chain_index, false);
+ if (!chain) {
+ /* User requested flush on non-existent chain. Nothing to do,
+ * so just return success.
+ */
+ if (prio == 0) {
+ err = 0;
+ goto errout;
+ }
+ NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+ err = -ENOENT;
+ goto errout;
+ }
+
+ if (prio == 0) {
+ tfilter_notify_chain(net, skb, block, q, parent, n,
+ chain, RTM_DELTFILTER);
+ tcf_chain_flush(chain);
+ err = 0;
+ goto errout;
+ }
+
+ tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+ prio, false);
+ if (!tp || IS_ERR(tp)) {
+ NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+ err = tp ? PTR_ERR(tp) : -ENOENT;
+ goto errout;
+ } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+ NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ fh = tp->ops->get(tp, t->tcm_handle);
+
+ if (!fh) {
+ if (t->tcm_handle == 0) {
+ tcf_chain_tp_remove(chain, &chain_info, tp);
+ tfilter_notify(net, skb, n, tp, block, q, parent, fh,
+ RTM_DELTFILTER, false);
+ tcf_proto_destroy(tp, extack);
+ err = 0;
+ } else {
+ NL_SET_ERR_MSG(extack, "Specified filter handle not found");
+ err = -ENOENT;
+ }
+ } else {
+ bool last;
+
+ err = tfilter_del_notify(net, skb, n, tp, block,
+ q, parent, fh, false, &last,
+ extack);
+ if (err)
+ goto errout;
+ if (last) {
+ tcf_chain_tp_remove(chain, &chain_info, tp);
+ tcf_proto_destroy(tp, extack);
+ }
+ }
+
+errout:
+ if (chain)
+ tcf_chain_put(chain);
+ return err;
+}
+
+static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct tcmsg *t;
+ u32 protocol;
+ u32 prio;
+ u32 parent;
+ u32 chain_index;
+ struct Qdisc *q = NULL;
+ struct tcf_chain_info chain_info;
+ struct tcf_chain *chain = NULL;
+ struct tcf_block *block;
+ struct tcf_proto *tp = NULL;
+ unsigned long cl = 0;
+ void *fh = NULL;
+ int err;
+
+ err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
+ if (err < 0)
+ return err;
+
+ t = nlmsg_data(n);
+ protocol = TC_H_MIN(t->tcm_info);
+ prio = TC_H_MAJ(t->tcm_info);
+ parent = t->tcm_parent;
+
+ if (prio == 0) {
+ NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
+ return -ENOENT;
+ }
+
+ /* Find head of filter chain. */
+
+ block = tcf_block_find(net, &q, &parent, &cl,
+ t->tcm_ifindex, t->tcm_block_index, extack);
+ if (IS_ERR(block)) {
+ err = PTR_ERR(block);
+ goto errout;
+ }
+
+ chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+ if (chain_index > TC_ACT_EXT_VAL_MASK) {
+ NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+ err = -EINVAL;
+ goto errout;
+ }
+ chain = tcf_chain_get(block, chain_index, false);
+ if (!chain) {
+ NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+ prio, false);
+ if (!tp || IS_ERR(tp)) {
+ NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+ err = tp ? PTR_ERR(tp) : -ENOENT;
+ goto errout;
+ } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+ NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+ err = -EINVAL;
+ goto errout;
+ }
+
+ fh = tp->ops->get(tp, t->tcm_handle);
+
+ if (!fh) {
+ NL_SET_ERR_MSG(extack, "Specified filter handle not found");
+ err = -ENOENT;
+ } else {
+ err = tfilter_notify(net, skb, n, tp, block, q, parent,
+ fh, RTM_NEWTFILTER, true);
+ if (err < 0)
+ NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
+ }
+
+errout:
+ if (chain)
+ tcf_chain_put(chain);
+ return err;
+}
+
+struct tcf_dump_args {
+ struct tcf_walker w;
+ struct sk_buff *skb;
+ struct netlink_callback *cb;
+ struct tcf_block *block;
+ struct Qdisc *q;
+ u32 parent;
+};
+
+static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
+{
+ struct tcf_dump_args *a = (void *)arg;
+ struct net *net = sock_net(a->skb->sk);
+
+ return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
+ n, NETLINK_CB(a->cb->skb).portid,
+ a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ RTM_NEWTFILTER);
+}
+
+static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
+ struct sk_buff *skb, struct netlink_callback *cb,
+ long index_start, long *p_index)
+{
+ struct net *net = sock_net(skb->sk);
+ struct tcf_block *block = chain->block;
+ struct tcmsg *tcm = nlmsg_data(cb->nlh);
+ struct tcf_dump_args arg;
+ struct tcf_proto *tp;
+
+ for (tp = rtnl_dereference(chain->filter_chain);
+ tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
+ if (*p_index < index_start)
+ continue;
+ if (TC_H_MAJ(tcm->tcm_info) &&
+ TC_H_MAJ(tcm->tcm_info) != tp->prio)
+ continue;
+ if (TC_H_MIN(tcm->tcm_info) &&
+ TC_H_MIN(tcm->tcm_info) != tp->protocol)
+ continue;
+ if (*p_index > index_start)
+ memset(&cb->args[1], 0,
+ sizeof(cb->args) - sizeof(cb->args[0]));
+ if (cb->args[1] == 0) {
+ if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ RTM_NEWTFILTER) <= 0)
+ return false;
+
+ cb->args[1] = 1;
+ }
+ if (!tp->ops->walk)
+ continue;
+ arg.w.fn = tcf_node_dump;
+ arg.skb = skb;
+ arg.cb = cb;
+ arg.block = block;
+ arg.q = q;
+ arg.parent = parent;
+ arg.w.stop = 0;
+ arg.w.skip = cb->args[1] - 1;
+ arg.w.count = 0;
+ arg.w.cookie = cb->args[2];
+ tp->ops->walk(tp, &arg.w);
+ cb->args[2] = arg.w.cookie;
+ cb->args[1] = arg.w.count + 1;
+ if (arg.w.stop)
+ return false;
+ }
+ return true;
+}
+
+/* called with RTNL */
+static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct Qdisc *q = NULL;
+ struct tcf_block *block;
+ struct tcf_chain *chain;
+ struct tcmsg *tcm = nlmsg_data(cb->nlh);
+ long index_start;
+ long index;
+ u32 parent;
+ int err;
+
+ if (nlmsg_len(cb->nlh) < sizeof(*tcm))
+ return skb->len;
+
+ err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
+ if (err)
+ return err;
+
+ if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+ block = tcf_block_lookup(net, tcm->tcm_block_index);
+ if (!block)
+ goto out;
+ /* If we work with block index, q is NULL and parent value
+ * will never be used in the following code. The check
+ * in tcf_fill_node prevents it. However, compiler does not
+ * see that far, so set parent to zero to silence the warning
+ * about parent being uninitialized.
+ */
+ parent = 0;
+ } else {
+ const struct Qdisc_class_ops *cops;
+ struct net_device *dev;
+ unsigned long cl = 0;
+
+ dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+ if (!dev)
+ return skb->len;
+
+ parent = tcm->tcm_parent;
+ if (!parent) {
+ q = dev->qdisc;
+ parent = q->handle;
+ } else {
+ q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
+ }
+ if (!q)
+ goto out;
+ cops = q->ops->cl_ops;
+ if (!cops)
+ goto out;
+ if (!cops->tcf_block)
+ goto out;
+ if (TC_H_MIN(tcm->tcm_parent)) {
+ cl = cops->find(q, tcm->tcm_parent);
+ if (cl == 0)
+ goto out;
+ }
+ block = cops->tcf_block(q, cl, NULL);
+ if (!block)
+ goto out;
+ if (tcf_block_shared(block))
+ q = NULL;
+ }
+
+ index_start = cb->args[0];
+ index = 0;
+
+ list_for_each_entry(chain, &block->chain_list, list) {
+ if (tca[TCA_CHAIN] &&
+ nla_get_u32(tca[TCA_CHAIN]) != chain->index)
+ continue;
+ if (!tcf_chain_dump(chain, q, parent, skb, cb,
+ index_start, &index)) {
+ err = -EMSGSIZE;
+ break;
+ }
+ }
+
+ cb->args[0] = index;
+
+out:
+ /* If we did no progress, the error (EMSGSIZE) is real */
+ if (skb->len == 0 && err)
+ return err;
+ return skb->len;
+}
+
+static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net,
+ struct sk_buff *skb, struct tcf_block *block,
+ u32 portid, u32 seq, u16 flags, int event)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ const struct tcf_proto_ops *ops;
+ struct nlmsghdr *nlh;
+ struct tcmsg *tcm;
+ void *priv;
+
+ ops = chain->tmplt_ops;
+ priv = chain->tmplt_priv;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
+ if (!nlh)
+ goto out_nlmsg_trim;
+ tcm = nlmsg_data(nlh);
+ tcm->tcm_family = AF_UNSPEC;
+ tcm->tcm__pad1 = 0;
+ tcm->tcm__pad2 = 0;
+ tcm->tcm_handle = 0;
+ if (block->q) {
+ tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
+ tcm->tcm_parent = block->q->handle;
+ } else {
+ tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
+ tcm->tcm_block_index = block->index;
+ }
+
+ if (nla_put_u32(skb, TCA_CHAIN, chain->index))
+ goto nla_put_failure;
+
+ if (ops) {
+ if (nla_put_string(skb, TCA_KIND, ops->kind))
+ goto nla_put_failure;
+ if (ops->tmplt_dump(skb, net, priv) < 0)
+ goto nla_put_failure;
+ }
+
+ nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+ return skb->len;
+
+out_nlmsg_trim:
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -EMSGSIZE;
+}
+
+static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
+ u32 seq, u16 flags, int event, bool unicast)
+{
+ u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+ struct tcf_block *block = chain->block;
+ struct net *net = block->net;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ if (tc_chain_fill_node(chain, net, skb, block, portid,
+ seq, flags, event) <= 0) {
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ if (unicast)
+ return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
+
+ return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
+}
+
+static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
+ struct nlattr **tca,
+ struct netlink_ext_ack *extack)
+{
+ const struct tcf_proto_ops *ops;
+ void *tmplt_priv;
+
+ /* If kind is not set, user did not specify template. */
+ if (!tca[TCA_KIND])
+ return 0;
+
+ ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+ if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
+ NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
+ return -EOPNOTSUPP;
+ }
+
+ tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
+ if (IS_ERR(tmplt_priv)) {
+ module_put(ops->owner);
+ return PTR_ERR(tmplt_priv);
+ }
+ chain->tmplt_ops = ops;
+ chain->tmplt_priv = tmplt_priv;
+ return 0;
+}
+
+static void tc_chain_tmplt_del(struct tcf_chain *chain)
+{
+ const struct tcf_proto_ops *ops = chain->tmplt_ops;
+
+ /* If template ops are set, no work to do for us. */
+ if (!ops)
+ return;
+
+ ops->tmplt_destroy(chain->tmplt_priv);
+ module_put(ops->owner);
+}
+
+/* Add/delete/get a chain */
+
+static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct tcmsg *t;
+ u32 parent;
+ u32 chain_index;
+ struct Qdisc *q = NULL;
+ struct tcf_chain *chain = NULL;
+ struct tcf_block *block;
+ unsigned long cl;
+ int err;
+
+ if (n->nlmsg_type != RTM_GETCHAIN &&
+ !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+replay:
+ err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
+ if (err < 0)
+ return err;
+
+ t = nlmsg_data(n);
+ parent = t->tcm_parent;
+ cl = 0;
+
+ block = tcf_block_find(net, &q, &parent, &cl,
+ t->tcm_ifindex, t->tcm_block_index, extack);
+ if (IS_ERR(block))
+ return PTR_ERR(block);
+
+ chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+ if (chain_index > TC_ACT_EXT_VAL_MASK) {
+ NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+ return -EINVAL;
+ }
+ chain = tcf_chain_lookup(block, chain_index);
+ if (n->nlmsg_type == RTM_NEWCHAIN) {
+ if (chain) {
+ if (tcf_chain_held_by_acts_only(chain)) {
+ /* The chain exists only because there is
+ * some action referencing it.
+ */
+ tcf_chain_hold(chain);
+ } else {
+ NL_SET_ERR_MSG(extack, "Filter chain already exists");
+ return -EEXIST;
+ }
+ } else {
+ if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+ NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
+ return -ENOENT;
+ }
+ chain = tcf_chain_create(block, chain_index);
+ if (!chain) {
+ NL_SET_ERR_MSG(extack, "Failed to create filter chain");
+ return -ENOMEM;
+ }
+ }
+ } else {
+ if (!chain || tcf_chain_held_by_acts_only(chain)) {
+ NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+ return -EINVAL;
+ }
+ tcf_chain_hold(chain);
+ }
+
+ switch (n->nlmsg_type) {
+ case RTM_NEWCHAIN:
+ err = tc_chain_tmplt_add(chain, net, tca, extack);
+ if (err)
+ goto errout;
+ /* In case the chain was successfully added, take a reference
+ * to the chain. This ensures that an empty chain
+ * does not disappear at the end of this function.
+ */
+ tcf_chain_hold(chain);
+ chain->explicitly_created = true;
+ tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
+ RTM_NEWCHAIN, false);
+ break;
+ case RTM_DELCHAIN:
+ tfilter_notify_chain(net, skb, block, q, parent, n,
+ chain, RTM_DELTFILTER);
+ /* Flush the chain first as the user requested chain removal. */
+ tcf_chain_flush(chain);
+ /* In case the chain was successfully deleted, put a reference
+ * to the chain previously taken during addition.
+ */
+ tcf_chain_put_explicitly_created(chain);
+ chain->explicitly_created = false;
+ break;
+ case RTM_GETCHAIN:
+ err = tc_chain_notify(chain, skb, n->nlmsg_seq,
+ n->nlmsg_seq, n->nlmsg_type, true);
+ if (err < 0)
+ NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ NL_SET_ERR_MSG(extack, "Unsupported message type");
+ goto errout;
+ }
+
+errout:
+ tcf_chain_put(chain);
+ if (err == -EAGAIN)
+ /* Replay the request. */
+ goto replay;
+ return err;
+}
+
+/* called with RTNL */
+static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tca[TCA_MAX + 1];
+ struct Qdisc *q = NULL;
+ struct tcf_block *block;
+ struct tcf_chain *chain;
+ struct tcmsg *tcm = nlmsg_data(cb->nlh);
+ long index_start;
+ long index;
+ u32 parent;
+ int err;
+
+ if (nlmsg_len(cb->nlh) < sizeof(*tcm))
+ return skb->len;
+
+ err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
+ NULL);
+ if (err)
+ return err;
+
+ if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+ block = tcf_block_lookup(net, tcm->tcm_block_index);
+ if (!block)
+ goto out;
+ /* If we work with block index, q is NULL and parent value
+ * will never be used in the following code. The check
+ * in tcf_fill_node prevents it. However, compiler does not
+ * see that far, so set parent to zero to silence the warning
+ * about parent being uninitialized.
+ */
+ parent = 0;
+ } else {
+ const struct Qdisc_class_ops *cops;
+ struct net_device *dev;
+ unsigned long cl = 0;
+
+ dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+ if (!dev)
+ return skb->len;
+
+ parent = tcm->tcm_parent;
+ if (!parent) {
+ q = dev->qdisc;
+ parent = q->handle;
+ } else {
+ q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
+ }
+ if (!q)
+ goto out;
+ cops = q->ops->cl_ops;
+ if (!cops)
+ goto out;
+ if (!cops->tcf_block)
+ goto out;
+ if (TC_H_MIN(tcm->tcm_parent)) {
+ cl = cops->find(q, tcm->tcm_parent);
+ if (cl == 0)
+ goto out;
+ }
+ block = cops->tcf_block(q, cl, NULL);
+ if (!block)
+ goto out;
+ if (tcf_block_shared(block))
+ q = NULL;
+ }
+
+ index_start = cb->args[0];
+ index = 0;
+
+ list_for_each_entry(chain, &block->chain_list, list) {
+ if ((tca[TCA_CHAIN] &&
+ nla_get_u32(tca[TCA_CHAIN]) != chain->index))
+ continue;
+ if (index < index_start) {
+ index++;
+ continue;
+ }
+ if (tcf_chain_held_by_acts_only(chain))
+ continue;
+ err = tc_chain_fill_node(chain, net, skb, block,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ RTM_NEWCHAIN);
+ if (err <= 0)
+ break;
+ index++;
+ }
+
+ cb->args[0] = index;
+
+out:
+ /* If we did no progress, the error (EMSGSIZE) is real */
+ if (skb->len == 0 && err)
+ return err;
+ return skb->len;
+}
+
+void tcf_exts_destroy(struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
+ kfree(exts->actions);
+ exts->nr_actions = 0;
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_destroy);
+
+int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+ struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
+ struct netlink_ext_ack *extack)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ {
+ struct tc_action *act;
+ size_t attr_size = 0;
+
+ if (exts->police && tb[exts->police]) {
+ act = tcf_action_init_1(net, tp, tb[exts->police],
+ rate_tlv, "police", ovr,
+ TCA_ACT_BIND, true, extack);
+ if (IS_ERR(act))
+ return PTR_ERR(act);
+
+ act->type = exts->type = TCA_OLD_COMPAT;
+ exts->actions[0] = act;
+ exts->nr_actions = 1;
+ } else if (exts->action && tb[exts->action]) {
+ int err;
+
+ err = tcf_action_init(net, tp, tb[exts->action],
+ rate_tlv, NULL, ovr, TCA_ACT_BIND,
+ exts->actions, &attr_size, true,
+ extack);
+ if (err < 0)
+ return err;
+ exts->nr_actions = err;
+ }
+ exts->net = net;
+ }
+#else
+ if ((exts->action && tb[exts->action]) ||
+ (exts->police && tb[exts->police])) {
+ NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
+ return -EOPNOTSUPP;
+ }
+#endif
+
+ return 0;
+}
+EXPORT_SYMBOL(tcf_exts_validate);
+
+void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ struct tcf_exts old = *dst;
+
+ *dst = *src;
+ tcf_exts_destroy(&old);
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_change);
+
+#ifdef CONFIG_NET_CLS_ACT
+static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
+{
+ if (exts->nr_actions == 0)
+ return NULL;
+ else
+ return exts->actions[0];
+}
+#endif
+
+int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ struct nlattr *nest;
+
+ if (exts->action && tcf_exts_has_actions(exts)) {
+ /*
+ * 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 (exts->type != TCA_OLD_COMPAT) {
+ nest = nla_nest_start(skb, exts->action);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
+ goto nla_put_failure;
+ nla_nest_end(skb, nest);
+ } else if (exts->police) {
+ struct tc_action *act = tcf_exts_first_act(exts);
+ nest = nla_nest_start(skb, exts->police);
+ if (nest == NULL || !act)
+ goto nla_put_failure;
+ if (tcf_action_dump_old(skb, act, 0, 0) < 0)
+ goto nla_put_failure;
+ nla_nest_end(skb, nest);
+ }
+ }
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -1;
+#else
+ return 0;
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_dump);
+
+
+int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ struct tc_action *a = tcf_exts_first_act(exts);
+ if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
+ return -1;
+#endif
+ return 0;
+}
+EXPORT_SYMBOL(tcf_exts_dump_stats);
+
+static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
+ enum tc_setup_type type,
+ void *type_data, bool err_stop)
+{
+ int ok_count = 0;
+#ifdef CONFIG_NET_CLS_ACT
+ const struct tc_action *a;
+ struct net_device *dev;
+ int i, ret;
+
+ if (!tcf_exts_has_actions(exts))
+ return 0;
+
+ for (i = 0; i < exts->nr_actions; i++) {
+ a = exts->actions[i];
+ if (!a->ops->get_dev)
+ continue;
+ dev = a->ops->get_dev(a);
+ if (!dev)
+ continue;
+ ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
+ a->ops->put_dev(dev);
+ if (ret < 0)
+ return ret;
+ ok_count += ret;
+ }
+#endif
+ return ok_count;
+}
+
+int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
+ enum tc_setup_type type, void *type_data, bool err_stop)
+{
+ int ok_count;
+ int ret;
+
+ ret = tcf_block_cb_call(block, type, type_data, err_stop);
+ if (ret < 0)
+ return ret;
+ ok_count = ret;
+
+ if (!exts || ok_count)
+ return ok_count;
+ ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
+ if (ret < 0)
+ return ret;
+ ok_count += ret;
+
+ return ok_count;
+}
+EXPORT_SYMBOL(tc_setup_cb_call);
+
+static __net_init int tcf_net_init(struct net *net)
+{
+ struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+ idr_init(&tn->idr);
+ return 0;
+}
+
+static void __net_exit tcf_net_exit(struct net *net)
+{
+ struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+ idr_destroy(&tn->idr);
+}
+
+static struct pernet_operations tcf_net_ops = {
+ .init = tcf_net_init,
+ .exit = tcf_net_exit,
+ .id = &tcf_net_id,
+ .size = sizeof(struct tcf_net),
+};
+
+static int __init tc_filter_init(void)
+{
+ int err;
+
+ tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
+ if (!tc_filter_wq)
+ return -ENOMEM;
+
+ err = register_pernet_subsys(&tcf_net_ops);
+ if (err)
+ goto err_register_pernet_subsys;
+
+ rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0);
+ rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0);
+ rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
+ tc_dump_tfilter, 0);
+ rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
+ rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
+ rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
+ tc_dump_chain, 0);
+
+ return 0;
+
+err_register_pernet_subsys:
+ destroy_workqueue(tc_filter_wq);
+ return err;
+}
+
+subsys_initcall(tc_filter_init);