v4.19.13 snapshot.
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
new file mode 100644
index 0000000..b2c3406
--- /dev/null
+++ b/net/sched/cls_u32.c
@@ -0,0 +1,1498 @@
+/*
+ * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
+ *
+ * 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>
+ *
+ * The filters are packed to hash tables of key nodes
+ * with a set of 32bit key/mask pairs at every node.
+ * Nodes reference next level hash tables etc.
+ *
+ * This scheme is the best universal classifier I managed to
+ * invent; it is not super-fast, but it is not slow (provided you
+ * program it correctly), and general enough. And its relative
+ * speed grows as the number of rules becomes larger.
+ *
+ * It seems that it represents the best middle point between
+ * speed and manageability both by human and by machine.
+ *
+ * It is especially useful for link sharing combined with QoS;
+ * pure RSVP doesn't need such a general approach and can use
+ * much simpler (and faster) schemes, sort of cls_rsvp.c.
+ *
+ * JHS: We should remove the CONFIG_NET_CLS_IND from here
+ * eventually when the meta match extension is made available
+ *
+ * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/percpu.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/bitmap.h>
+#include <linux/netdevice.h>
+#include <linux/hash.h>
+#include <net/netlink.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+#include <linux/idr.h>
+
+struct tc_u_knode {
+ struct tc_u_knode __rcu *next;
+ u32 handle;
+ struct tc_u_hnode __rcu *ht_up;
+ struct tcf_exts exts;
+#ifdef CONFIG_NET_CLS_IND
+ int ifindex;
+#endif
+ u8 fshift;
+ struct tcf_result res;
+ struct tc_u_hnode __rcu *ht_down;
+#ifdef CONFIG_CLS_U32_PERF
+ struct tc_u32_pcnt __percpu *pf;
+#endif
+ u32 flags;
+ unsigned int in_hw_count;
+#ifdef CONFIG_CLS_U32_MARK
+ u32 val;
+ u32 mask;
+ u32 __percpu *pcpu_success;
+#endif
+ struct tcf_proto *tp;
+ struct rcu_work rwork;
+ /* The 'sel' field MUST be the last field in structure to allow for
+ * tc_u32_keys allocated at end of structure.
+ */
+ struct tc_u32_sel sel;
+};
+
+struct tc_u_hnode {
+ struct tc_u_hnode __rcu *next;
+ u32 handle;
+ u32 prio;
+ struct tc_u_common *tp_c;
+ int refcnt;
+ unsigned int divisor;
+ struct idr handle_idr;
+ struct rcu_head rcu;
+ u32 flags;
+ /* The 'ht' field MUST be the last field in structure to allow for
+ * more entries allocated at end of structure.
+ */
+ struct tc_u_knode __rcu *ht[1];
+};
+
+struct tc_u_common {
+ struct tc_u_hnode __rcu *hlist;
+ void *ptr;
+ int refcnt;
+ struct idr handle_idr;
+ struct hlist_node hnode;
+ struct rcu_head rcu;
+};
+
+static inline unsigned int u32_hash_fold(__be32 key,
+ const struct tc_u32_sel *sel,
+ u8 fshift)
+{
+ unsigned int h = ntohl(key & sel->hmask) >> fshift;
+
+ return h;
+}
+
+static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+ struct tcf_result *res)
+{
+ struct {
+ struct tc_u_knode *knode;
+ unsigned int off;
+ } stack[TC_U32_MAXDEPTH];
+
+ struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
+ unsigned int off = skb_network_offset(skb);
+ struct tc_u_knode *n;
+ int sdepth = 0;
+ int off2 = 0;
+ int sel = 0;
+#ifdef CONFIG_CLS_U32_PERF
+ int j;
+#endif
+ int i, r;
+
+next_ht:
+ n = rcu_dereference_bh(ht->ht[sel]);
+
+next_knode:
+ if (n) {
+ struct tc_u32_key *key = n->sel.keys;
+
+#ifdef CONFIG_CLS_U32_PERF
+ __this_cpu_inc(n->pf->rcnt);
+ j = 0;
+#endif
+
+ if (tc_skip_sw(n->flags)) {
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ }
+
+#ifdef CONFIG_CLS_U32_MARK
+ if ((skb->mark & n->mask) != n->val) {
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ } else {
+ __this_cpu_inc(*n->pcpu_success);
+ }
+#endif
+
+ for (i = n->sel.nkeys; i > 0; i--, key++) {
+ int toff = off + key->off + (off2 & key->offmask);
+ __be32 *data, hdata;
+
+ if (skb_headroom(skb) + toff > INT_MAX)
+ goto out;
+
+ data = skb_header_pointer(skb, toff, 4, &hdata);
+ if (!data)
+ goto out;
+ if ((*data ^ key->val) & key->mask) {
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ }
+#ifdef CONFIG_CLS_U32_PERF
+ __this_cpu_inc(n->pf->kcnts[j]);
+ j++;
+#endif
+ }
+
+ ht = rcu_dereference_bh(n->ht_down);
+ if (!ht) {
+check_terminal:
+ if (n->sel.flags & TC_U32_TERMINAL) {
+
+ *res = n->res;
+#ifdef CONFIG_NET_CLS_IND
+ if (!tcf_match_indev(skb, n->ifindex)) {
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ }
+#endif
+#ifdef CONFIG_CLS_U32_PERF
+ __this_cpu_inc(n->pf->rhit);
+#endif
+ r = tcf_exts_exec(skb, &n->exts, res);
+ if (r < 0) {
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ }
+
+ return r;
+ }
+ n = rcu_dereference_bh(n->next);
+ goto next_knode;
+ }
+
+ /* PUSH */
+ if (sdepth >= TC_U32_MAXDEPTH)
+ goto deadloop;
+ stack[sdepth].knode = n;
+ stack[sdepth].off = off;
+ sdepth++;
+
+ ht = rcu_dereference_bh(n->ht_down);
+ sel = 0;
+ if (ht->divisor) {
+ __be32 *data, hdata;
+
+ data = skb_header_pointer(skb, off + n->sel.hoff, 4,
+ &hdata);
+ if (!data)
+ goto out;
+ sel = ht->divisor & u32_hash_fold(*data, &n->sel,
+ n->fshift);
+ }
+ if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
+ goto next_ht;
+
+ if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
+ off2 = n->sel.off + 3;
+ if (n->sel.flags & TC_U32_VAROFFSET) {
+ __be16 *data, hdata;
+
+ data = skb_header_pointer(skb,
+ off + n->sel.offoff,
+ 2, &hdata);
+ if (!data)
+ goto out;
+ off2 += ntohs(n->sel.offmask & *data) >>
+ n->sel.offshift;
+ }
+ off2 &= ~3;
+ }
+ if (n->sel.flags & TC_U32_EAT) {
+ off += off2;
+ off2 = 0;
+ }
+
+ if (off < skb->len)
+ goto next_ht;
+ }
+
+ /* POP */
+ if (sdepth--) {
+ n = stack[sdepth].knode;
+ ht = rcu_dereference_bh(n->ht_up);
+ off = stack[sdepth].off;
+ goto check_terminal;
+ }
+out:
+ return -1;
+
+deadloop:
+ net_warn_ratelimited("cls_u32: dead loop\n");
+ return -1;
+}
+
+static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
+{
+ struct tc_u_hnode *ht;
+
+ for (ht = rtnl_dereference(tp_c->hlist);
+ ht;
+ ht = rtnl_dereference(ht->next))
+ if (ht->handle == handle)
+ break;
+
+ return ht;
+}
+
+static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
+{
+ unsigned int sel;
+ struct tc_u_knode *n = NULL;
+
+ sel = TC_U32_HASH(handle);
+ if (sel > ht->divisor)
+ goto out;
+
+ for (n = rtnl_dereference(ht->ht[sel]);
+ n;
+ n = rtnl_dereference(n->next))
+ if (n->handle == handle)
+ break;
+out:
+ return n;
+}
+
+
+static void *u32_get(struct tcf_proto *tp, u32 handle)
+{
+ struct tc_u_hnode *ht;
+ struct tc_u_common *tp_c = tp->data;
+
+ if (TC_U32_HTID(handle) == TC_U32_ROOT)
+ ht = rtnl_dereference(tp->root);
+ else
+ ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
+
+ if (!ht)
+ return NULL;
+
+ if (TC_U32_KEY(handle) == 0)
+ return ht;
+
+ return u32_lookup_key(ht, handle);
+}
+
+/* Protected by rtnl lock */
+static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
+{
+ int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
+ if (id < 0)
+ return 0;
+ return (id | 0x800U) << 20;
+}
+
+static struct hlist_head *tc_u_common_hash;
+
+#define U32_HASH_SHIFT 10
+#define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
+
+static void *tc_u_common_ptr(const struct tcf_proto *tp)
+{
+ struct tcf_block *block = tp->chain->block;
+
+ /* The block sharing is currently supported only
+ * for classless qdiscs. In that case we use block
+ * for tc_u_common identification. In case the
+ * block is not shared, block->q is a valid pointer
+ * and we can use that. That works for classful qdiscs.
+ */
+ if (tcf_block_shared(block))
+ return block;
+ else
+ return block->q;
+}
+
+static unsigned int tc_u_hash(const struct tcf_proto *tp)
+{
+ return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
+}
+
+static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
+{
+ struct tc_u_common *tc;
+ unsigned int h;
+
+ h = tc_u_hash(tp);
+ hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
+ if (tc->ptr == tc_u_common_ptr(tp))
+ return tc;
+ }
+ return NULL;
+}
+
+static int u32_init(struct tcf_proto *tp)
+{
+ struct tc_u_hnode *root_ht;
+ struct tc_u_common *tp_c;
+ unsigned int h;
+
+ tp_c = tc_u_common_find(tp);
+
+ root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
+ if (root_ht == NULL)
+ return -ENOBUFS;
+
+ root_ht->refcnt++;
+ root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
+ root_ht->prio = tp->prio;
+ idr_init(&root_ht->handle_idr);
+
+ if (tp_c == NULL) {
+ tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
+ if (tp_c == NULL) {
+ kfree(root_ht);
+ return -ENOBUFS;
+ }
+ tp_c->ptr = tc_u_common_ptr(tp);
+ INIT_HLIST_NODE(&tp_c->hnode);
+ idr_init(&tp_c->handle_idr);
+
+ h = tc_u_hash(tp);
+ hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
+ }
+
+ tp_c->refcnt++;
+ RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
+ rcu_assign_pointer(tp_c->hlist, root_ht);
+ root_ht->tp_c = tp_c;
+
+ root_ht->refcnt++;
+ rcu_assign_pointer(tp->root, root_ht);
+ tp->data = tp_c;
+ return 0;
+}
+
+static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
+ bool free_pf)
+{
+ struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
+
+ tcf_exts_destroy(&n->exts);
+ tcf_exts_put_net(&n->exts);
+ if (ht && --ht->refcnt == 0)
+ kfree(ht);
+#ifdef CONFIG_CLS_U32_PERF
+ if (free_pf)
+ free_percpu(n->pf);
+#endif
+#ifdef CONFIG_CLS_U32_MARK
+ if (free_pf)
+ free_percpu(n->pcpu_success);
+#endif
+ kfree(n);
+ return 0;
+}
+
+/* u32_delete_key_rcu should be called when free'ing a copied
+ * version of a tc_u_knode obtained from u32_init_knode(). When
+ * copies are obtained from u32_init_knode() the statistics are
+ * shared between the old and new copies to allow readers to
+ * continue to update the statistics during the copy. To support
+ * this the u32_delete_key_rcu variant does not free the percpu
+ * statistics.
+ */
+static void u32_delete_key_work(struct work_struct *work)
+{
+ struct tc_u_knode *key = container_of(to_rcu_work(work),
+ struct tc_u_knode,
+ rwork);
+ rtnl_lock();
+ u32_destroy_key(key->tp, key, false);
+ rtnl_unlock();
+}
+
+/* u32_delete_key_freepf_rcu is the rcu callback variant
+ * that free's the entire structure including the statistics
+ * percpu variables. Only use this if the key is not a copy
+ * returned by u32_init_knode(). See u32_delete_key_rcu()
+ * for the variant that should be used with keys return from
+ * u32_init_knode()
+ */
+static void u32_delete_key_freepf_work(struct work_struct *work)
+{
+ struct tc_u_knode *key = container_of(to_rcu_work(work),
+ struct tc_u_knode,
+ rwork);
+ rtnl_lock();
+ u32_destroy_key(key->tp, key, true);
+ rtnl_unlock();
+}
+
+static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
+{
+ struct tc_u_knode __rcu **kp;
+ struct tc_u_knode *pkp;
+ struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
+
+ if (ht) {
+ kp = &ht->ht[TC_U32_HASH(key->handle)];
+ for (pkp = rtnl_dereference(*kp); pkp;
+ kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
+ if (pkp == key) {
+ RCU_INIT_POINTER(*kp, key->next);
+
+ tcf_unbind_filter(tp, &key->res);
+ idr_remove(&ht->handle_idr, key->handle);
+ tcf_exts_get_net(&key->exts);
+ tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
+ return 0;
+ }
+ }
+ }
+ WARN_ON(1);
+ return 0;
+}
+
+static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block *block = tp->chain->block;
+ struct tc_cls_u32_offload cls_u32 = {};
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
+ cls_u32.command = TC_CLSU32_DELETE_HNODE;
+ cls_u32.hnode.divisor = h->divisor;
+ cls_u32.hnode.handle = h->handle;
+ cls_u32.hnode.prio = h->prio;
+
+ tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
+}
+
+static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
+ u32 flags, struct netlink_ext_ack *extack)
+{
+ struct tcf_block *block = tp->chain->block;
+ struct tc_cls_u32_offload cls_u32 = {};
+ bool skip_sw = tc_skip_sw(flags);
+ bool offloaded = false;
+ int err;
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
+ cls_u32.command = TC_CLSU32_NEW_HNODE;
+ cls_u32.hnode.divisor = h->divisor;
+ cls_u32.hnode.handle = h->handle;
+ cls_u32.hnode.prio = h->prio;
+
+ err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
+ if (err < 0) {
+ u32_clear_hw_hnode(tp, h, NULL);
+ return err;
+ } else if (err > 0) {
+ offloaded = true;
+ }
+
+ if (skip_sw && !offloaded)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_block *block = tp->chain->block;
+ struct tc_cls_u32_offload cls_u32 = {};
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
+ cls_u32.command = TC_CLSU32_DELETE_KNODE;
+ cls_u32.knode.handle = n->handle;
+
+ tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
+ tcf_block_offload_dec(block, &n->flags);
+}
+
+static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
+ u32 flags, struct netlink_ext_ack *extack)
+{
+ struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
+ struct tcf_block *block = tp->chain->block;
+ struct tc_cls_u32_offload cls_u32 = {};
+ bool skip_sw = tc_skip_sw(flags);
+ int err;
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
+ cls_u32.command = TC_CLSU32_REPLACE_KNODE;
+ cls_u32.knode.handle = n->handle;
+ cls_u32.knode.fshift = n->fshift;
+#ifdef CONFIG_CLS_U32_MARK
+ cls_u32.knode.val = n->val;
+ cls_u32.knode.mask = n->mask;
+#else
+ cls_u32.knode.val = 0;
+ cls_u32.knode.mask = 0;
+#endif
+ cls_u32.knode.sel = &n->sel;
+ cls_u32.knode.exts = &n->exts;
+ if (n->ht_down)
+ cls_u32.knode.link_handle = ht->handle;
+
+ err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
+ if (err < 0) {
+ u32_remove_hw_knode(tp, n, NULL);
+ return err;
+ } else if (err > 0) {
+ n->in_hw_count = err;
+ tcf_block_offload_inc(block, &n->flags);
+ }
+
+ if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_u_knode *n;
+ unsigned int h;
+
+ for (h = 0; h <= ht->divisor; h++) {
+ while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
+ RCU_INIT_POINTER(ht->ht[h],
+ rtnl_dereference(n->next));
+ tcf_unbind_filter(tp, &n->res);
+ u32_remove_hw_knode(tp, n, extack);
+ idr_remove(&ht->handle_idr, n->handle);
+ if (tcf_exts_get_net(&n->exts))
+ tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
+ else
+ u32_destroy_key(n->tp, n, true);
+ }
+ }
+}
+
+static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_u_common *tp_c = tp->data;
+ struct tc_u_hnode __rcu **hn;
+ struct tc_u_hnode *phn;
+
+ WARN_ON(--ht->refcnt);
+
+ u32_clear_hnode(tp, ht, extack);
+
+ hn = &tp_c->hlist;
+ for (phn = rtnl_dereference(*hn);
+ phn;
+ hn = &phn->next, phn = rtnl_dereference(*hn)) {
+ if (phn == ht) {
+ u32_clear_hw_hnode(tp, ht, extack);
+ idr_destroy(&ht->handle_idr);
+ idr_remove(&tp_c->handle_idr, ht->handle);
+ RCU_INIT_POINTER(*hn, ht->next);
+ kfree_rcu(ht, rcu);
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static bool ht_empty(struct tc_u_hnode *ht)
+{
+ unsigned int h;
+
+ for (h = 0; h <= ht->divisor; h++)
+ if (rcu_access_pointer(ht->ht[h]))
+ return false;
+
+ return true;
+}
+
+static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
+{
+ struct tc_u_common *tp_c = tp->data;
+ struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
+
+ WARN_ON(root_ht == NULL);
+
+ if (root_ht && --root_ht->refcnt == 1)
+ u32_destroy_hnode(tp, root_ht, extack);
+
+ if (--tp_c->refcnt == 0) {
+ struct tc_u_hnode *ht;
+
+ hlist_del(&tp_c->hnode);
+
+ while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
+ u32_clear_hnode(tp, ht, extack);
+ RCU_INIT_POINTER(tp_c->hlist, ht->next);
+
+ /* u32_destroy_key() will later free ht for us, if it's
+ * still referenced by some knode
+ */
+ if (--ht->refcnt == 0)
+ kfree_rcu(ht, rcu);
+ }
+
+ idr_destroy(&tp_c->handle_idr);
+ kfree(tp_c);
+ }
+
+ tp->data = NULL;
+}
+
+static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_u_hnode *ht = arg;
+ struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
+ struct tc_u_common *tp_c = tp->data;
+ int ret = 0;
+
+ if (ht == NULL)
+ goto out;
+
+ if (TC_U32_KEY(ht->handle)) {
+ u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
+ ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
+ goto out;
+ }
+
+ if (root_ht == ht) {
+ NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
+ return -EINVAL;
+ }
+
+ if (ht->refcnt == 1) {
+ u32_destroy_hnode(tp, ht, extack);
+ } else {
+ NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
+ return -EBUSY;
+ }
+
+out:
+ *last = true;
+ if (root_ht) {
+ if (root_ht->refcnt > 2) {
+ *last = false;
+ goto ret;
+ }
+ if (root_ht->refcnt == 2) {
+ if (!ht_empty(root_ht)) {
+ *last = false;
+ goto ret;
+ }
+ }
+ }
+
+ if (tp_c->refcnt > 1) {
+ *last = false;
+ goto ret;
+ }
+
+ if (tp_c->refcnt == 1) {
+ struct tc_u_hnode *ht;
+
+ for (ht = rtnl_dereference(tp_c->hlist);
+ ht;
+ ht = rtnl_dereference(ht->next))
+ if (!ht_empty(ht)) {
+ *last = false;
+ break;
+ }
+ }
+
+ret:
+ return ret;
+}
+
+static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
+{
+ u32 index = htid | 0x800;
+ u32 max = htid | 0xFFF;
+
+ if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
+ index = htid + 1;
+ if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
+ GFP_KERNEL))
+ index = max;
+ }
+
+ return index;
+}
+
+static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
+ [TCA_U32_CLASSID] = { .type = NLA_U32 },
+ [TCA_U32_HASH] = { .type = NLA_U32 },
+ [TCA_U32_LINK] = { .type = NLA_U32 },
+ [TCA_U32_DIVISOR] = { .type = NLA_U32 },
+ [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
+ [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
+ [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
+ [TCA_U32_FLAGS] = { .type = NLA_U32 },
+};
+
+static int u32_set_parms(struct net *net, struct tcf_proto *tp,
+ unsigned long base, struct tc_u_hnode *ht,
+ struct tc_u_knode *n, struct nlattr **tb,
+ struct nlattr *est, bool ovr,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_U32_LINK]) {
+ u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
+ struct tc_u_hnode *ht_down = NULL, *ht_old;
+
+ if (TC_U32_KEY(handle)) {
+ NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
+ return -EINVAL;
+ }
+
+ if (handle) {
+ ht_down = u32_lookup_ht(ht->tp_c, handle);
+
+ if (!ht_down) {
+ NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
+ return -EINVAL;
+ }
+ ht_down->refcnt++;
+ }
+
+ ht_old = rtnl_dereference(n->ht_down);
+ rcu_assign_pointer(n->ht_down, ht_down);
+
+ if (ht_old)
+ ht_old->refcnt--;
+ }
+ if (tb[TCA_U32_CLASSID]) {
+ n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
+ tcf_bind_filter(tp, &n->res, base);
+ }
+
+#ifdef CONFIG_NET_CLS_IND
+ if (tb[TCA_U32_INDEV]) {
+ int ret;
+ ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
+ if (ret < 0)
+ return -EINVAL;
+ n->ifindex = ret;
+ }
+#endif
+ return 0;
+}
+
+static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
+ struct tc_u_knode *n)
+{
+ struct tc_u_knode __rcu **ins;
+ struct tc_u_knode *pins;
+ struct tc_u_hnode *ht;
+
+ if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
+ ht = rtnl_dereference(tp->root);
+ else
+ ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
+
+ ins = &ht->ht[TC_U32_HASH(n->handle)];
+
+ /* The node must always exist for it to be replaced if this is not the
+ * case then something went very wrong elsewhere.
+ */
+ for (pins = rtnl_dereference(*ins); ;
+ ins = &pins->next, pins = rtnl_dereference(*ins))
+ if (pins->handle == n->handle)
+ break;
+
+ idr_replace(&ht->handle_idr, n, n->handle);
+ RCU_INIT_POINTER(n->next, pins->next);
+ rcu_assign_pointer(*ins, n);
+}
+
+static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
+ struct tc_u_knode *n)
+{
+ struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
+ struct tc_u32_sel *s = &n->sel;
+ struct tc_u_knode *new;
+
+ new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
+ GFP_KERNEL);
+
+ if (!new)
+ return NULL;
+
+ RCU_INIT_POINTER(new->next, n->next);
+ new->handle = n->handle;
+ RCU_INIT_POINTER(new->ht_up, n->ht_up);
+
+#ifdef CONFIG_NET_CLS_IND
+ new->ifindex = n->ifindex;
+#endif
+ new->fshift = n->fshift;
+ new->res = n->res;
+ new->flags = n->flags;
+ RCU_INIT_POINTER(new->ht_down, ht);
+
+ /* bump reference count as long as we hold pointer to structure */
+ if (ht)
+ ht->refcnt++;
+
+#ifdef CONFIG_CLS_U32_PERF
+ /* Statistics may be incremented by readers during update
+ * so we must keep them in tact. When the node is later destroyed
+ * a special destroy call must be made to not free the pf memory.
+ */
+ new->pf = n->pf;
+#endif
+
+#ifdef CONFIG_CLS_U32_MARK
+ new->val = n->val;
+ new->mask = n->mask;
+ /* Similarly success statistics must be moved as pointers */
+ new->pcpu_success = n->pcpu_success;
+#endif
+ new->tp = tp;
+ memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
+
+ if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
+ kfree(new);
+ return NULL;
+ }
+
+ return new;
+}
+
+static int u32_change(struct net *net, struct sk_buff *in_skb,
+ struct tcf_proto *tp, unsigned long base, u32 handle,
+ struct nlattr **tca, void **arg, bool ovr,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_u_common *tp_c = tp->data;
+ struct tc_u_hnode *ht;
+ struct tc_u_knode *n;
+ struct tc_u32_sel *s;
+ struct nlattr *opt = tca[TCA_OPTIONS];
+ struct nlattr *tb[TCA_U32_MAX + 1];
+ u32 htid, flags = 0;
+ size_t sel_size;
+ int err;
+#ifdef CONFIG_CLS_U32_PERF
+ size_t size;
+#endif
+
+ if (!opt) {
+ if (handle) {
+ NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+ }
+
+ err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_U32_FLAGS]) {
+ flags = nla_get_u32(tb[TCA_U32_FLAGS]);
+ if (!tc_flags_valid(flags)) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
+ return -EINVAL;
+ }
+ }
+
+ n = *arg;
+ if (n) {
+ struct tc_u_knode *new;
+
+ if (TC_U32_KEY(n->handle) == 0) {
+ NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
+ return -EINVAL;
+ }
+
+ if ((n->flags ^ flags) &
+ ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
+ NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
+ return -EINVAL;
+ }
+
+ new = u32_init_knode(tp, n);
+ if (!new)
+ return -ENOMEM;
+
+ err = u32_set_parms(net, tp, base,
+ rtnl_dereference(n->ht_up), new, tb,
+ tca[TCA_RATE], ovr, extack);
+
+ if (err) {
+ u32_destroy_key(tp, new, false);
+ return err;
+ }
+
+ err = u32_replace_hw_knode(tp, new, flags, extack);
+ if (err) {
+ u32_destroy_key(tp, new, false);
+ return err;
+ }
+
+ if (!tc_in_hw(new->flags))
+ new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
+
+ u32_replace_knode(tp, tp_c, new);
+ tcf_unbind_filter(tp, &n->res);
+ tcf_exts_get_net(&n->exts);
+ tcf_queue_work(&n->rwork, u32_delete_key_work);
+ return 0;
+ }
+
+ if (tb[TCA_U32_DIVISOR]) {
+ unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
+
+ if (--divisor > 0x100) {
+ NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
+ return -EINVAL;
+ }
+ if (TC_U32_KEY(handle)) {
+ NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
+ return -EINVAL;
+ }
+ ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
+ if (ht == NULL)
+ return -ENOBUFS;
+ if (handle == 0) {
+ handle = gen_new_htid(tp->data, ht);
+ if (handle == 0) {
+ kfree(ht);
+ return -ENOMEM;
+ }
+ } else {
+ err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
+ handle, GFP_KERNEL);
+ if (err) {
+ kfree(ht);
+ return err;
+ }
+ }
+ ht->tp_c = tp_c;
+ ht->refcnt = 1;
+ ht->divisor = divisor;
+ ht->handle = handle;
+ ht->prio = tp->prio;
+ idr_init(&ht->handle_idr);
+ ht->flags = flags;
+
+ err = u32_replace_hw_hnode(tp, ht, flags, extack);
+ if (err) {
+ idr_remove(&tp_c->handle_idr, handle);
+ kfree(ht);
+ return err;
+ }
+
+ RCU_INIT_POINTER(ht->next, tp_c->hlist);
+ rcu_assign_pointer(tp_c->hlist, ht);
+ *arg = ht;
+
+ return 0;
+ }
+
+ if (tb[TCA_U32_HASH]) {
+ htid = nla_get_u32(tb[TCA_U32_HASH]);
+ if (TC_U32_HTID(htid) == TC_U32_ROOT) {
+ ht = rtnl_dereference(tp->root);
+ htid = ht->handle;
+ } else {
+ ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
+ if (!ht) {
+ NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
+ return -EINVAL;
+ }
+ }
+ } else {
+ ht = rtnl_dereference(tp->root);
+ htid = ht->handle;
+ }
+
+ if (ht->divisor < TC_U32_HASH(htid)) {
+ NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
+ return -EINVAL;
+ }
+
+ if (handle) {
+ if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
+ NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
+ return -EINVAL;
+ }
+ handle = htid | TC_U32_NODE(handle);
+ err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
+ GFP_KERNEL);
+ if (err)
+ return err;
+ } else
+ handle = gen_new_kid(ht, htid);
+
+ if (tb[TCA_U32_SEL] == NULL) {
+ NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
+ err = -EINVAL;
+ goto erridr;
+ }
+
+ s = nla_data(tb[TCA_U32_SEL]);
+ sel_size = struct_size(s, keys, s->nkeys);
+ if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
+ err = -EINVAL;
+ goto erridr;
+ }
+
+ n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
+ if (n == NULL) {
+ err = -ENOBUFS;
+ goto erridr;
+ }
+
+#ifdef CONFIG_CLS_U32_PERF
+ size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
+ n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
+ if (!n->pf) {
+ err = -ENOBUFS;
+ goto errfree;
+ }
+#endif
+
+ memcpy(&n->sel, s, sel_size);
+ RCU_INIT_POINTER(n->ht_up, ht);
+ n->handle = handle;
+ n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
+ n->flags = flags;
+ n->tp = tp;
+
+ err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
+ if (err < 0)
+ goto errout;
+
+#ifdef CONFIG_CLS_U32_MARK
+ n->pcpu_success = alloc_percpu(u32);
+ if (!n->pcpu_success) {
+ err = -ENOMEM;
+ goto errout;
+ }
+
+ if (tb[TCA_U32_MARK]) {
+ struct tc_u32_mark *mark;
+
+ mark = nla_data(tb[TCA_U32_MARK]);
+ n->val = mark->val;
+ n->mask = mark->mask;
+ }
+#endif
+
+ err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
+ extack);
+ if (err == 0) {
+ struct tc_u_knode __rcu **ins;
+ struct tc_u_knode *pins;
+
+ err = u32_replace_hw_knode(tp, n, flags, extack);
+ if (err)
+ goto errhw;
+
+ if (!tc_in_hw(n->flags))
+ n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
+
+ ins = &ht->ht[TC_U32_HASH(handle)];
+ for (pins = rtnl_dereference(*ins); pins;
+ ins = &pins->next, pins = rtnl_dereference(*ins))
+ if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
+ break;
+
+ RCU_INIT_POINTER(n->next, pins);
+ rcu_assign_pointer(*ins, n);
+ *arg = n;
+ return 0;
+ }
+
+errhw:
+#ifdef CONFIG_CLS_U32_MARK
+ free_percpu(n->pcpu_success);
+#endif
+
+errout:
+ tcf_exts_destroy(&n->exts);
+#ifdef CONFIG_CLS_U32_PERF
+errfree:
+ free_percpu(n->pf);
+#endif
+ kfree(n);
+erridr:
+ idr_remove(&ht->handle_idr, handle);
+ 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 int h;
+
+ if (arg->stop)
+ return;
+
+ for (ht = rtnl_dereference(tp_c->hlist);
+ ht;
+ ht = rtnl_dereference(ht->next)) {
+ if (ht->prio != tp->prio)
+ continue;
+ if (arg->count >= arg->skip) {
+ if (arg->fn(tp, ht, arg) < 0) {
+ arg->stop = 1;
+ return;
+ }
+ }
+ arg->count++;
+ for (h = 0; h <= ht->divisor; h++) {
+ for (n = rtnl_dereference(ht->ht[h]);
+ n;
+ n = rtnl_dereference(n->next)) {
+ if (arg->count < arg->skip) {
+ arg->count++;
+ continue;
+ }
+ if (arg->fn(tp, n, arg) < 0) {
+ arg->stop = 1;
+ return;
+ }
+ arg->count++;
+ }
+ }
+ }
+}
+
+static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
+ bool add, tc_setup_cb_t *cb, void *cb_priv,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_cls_u32_offload cls_u32 = {};
+ int err;
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
+ cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
+ cls_u32.hnode.divisor = ht->divisor;
+ cls_u32.hnode.handle = ht->handle;
+ cls_u32.hnode.prio = ht->prio;
+
+ err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
+ if (err && add && tc_skip_sw(ht->flags))
+ return err;
+
+ return 0;
+}
+
+static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
+ bool add, tc_setup_cb_t *cb, void *cb_priv,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
+ struct tcf_block *block = tp->chain->block;
+ struct tc_cls_u32_offload cls_u32 = {};
+ int err;
+
+ tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
+ cls_u32.command = add ?
+ TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
+ cls_u32.knode.handle = n->handle;
+
+ if (add) {
+ cls_u32.knode.fshift = n->fshift;
+#ifdef CONFIG_CLS_U32_MARK
+ cls_u32.knode.val = n->val;
+ cls_u32.knode.mask = n->mask;
+#else
+ cls_u32.knode.val = 0;
+ cls_u32.knode.mask = 0;
+#endif
+ cls_u32.knode.sel = &n->sel;
+ cls_u32.knode.exts = &n->exts;
+ if (n->ht_down)
+ cls_u32.knode.link_handle = ht->handle;
+ }
+
+ err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
+ if (err) {
+ if (add && tc_skip_sw(n->flags))
+ return err;
+ return 0;
+ }
+
+ tc_cls_offload_cnt_update(block, &n->in_hw_count, &n->flags, add);
+
+ return 0;
+}
+
+static int u32_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
+ void *cb_priv, struct netlink_ext_ack *extack)
+{
+ struct tc_u_common *tp_c = tp->data;
+ struct tc_u_hnode *ht;
+ struct tc_u_knode *n;
+ unsigned int h;
+ int err;
+
+ for (ht = rtnl_dereference(tp_c->hlist);
+ ht;
+ ht = rtnl_dereference(ht->next)) {
+ if (ht->prio != tp->prio)
+ continue;
+
+ /* When adding filters to a new dev, try to offload the
+ * hashtable first. When removing, do the filters before the
+ * hashtable.
+ */
+ if (add && !tc_skip_hw(ht->flags)) {
+ err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
+ extack);
+ if (err)
+ return err;
+ }
+
+ for (h = 0; h <= ht->divisor; h++) {
+ for (n = rtnl_dereference(ht->ht[h]);
+ n;
+ n = rtnl_dereference(n->next)) {
+ if (tc_skip_hw(n->flags))
+ continue;
+
+ err = u32_reoffload_knode(tp, n, add, cb,
+ cb_priv, extack);
+ if (err)
+ return err;
+ }
+ }
+
+ if (!add && !tc_skip_hw(ht->flags))
+ u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
+ }
+
+ return 0;
+}
+
+static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
+{
+ struct tc_u_knode *n = fh;
+
+ if (n && n->res.classid == classid)
+ n->res.class = cl;
+}
+
+static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
+ struct sk_buff *skb, struct tcmsg *t)
+{
+ struct tc_u_knode *n = fh;
+ struct tc_u_hnode *ht_up, *ht_down;
+ struct nlattr *nest;
+
+ if (n == NULL)
+ return skb->len;
+
+ t->tcm_handle = n->handle;
+
+ nest = nla_nest_start(skb, TCA_OPTIONS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (TC_U32_KEY(n->handle) == 0) {
+ struct tc_u_hnode *ht = fh;
+ u32 divisor = ht->divisor + 1;
+
+ if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
+ goto nla_put_failure;
+ } else {
+#ifdef CONFIG_CLS_U32_PERF
+ struct tc_u32_pcnt *gpf;
+ int cpu;
+#endif
+
+ if (nla_put(skb, TCA_U32_SEL,
+ sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
+ &n->sel))
+ goto nla_put_failure;
+
+ ht_up = rtnl_dereference(n->ht_up);
+ if (ht_up) {
+ u32 htid = n->handle & 0xFFFFF000;
+ if (nla_put_u32(skb, TCA_U32_HASH, htid))
+ goto nla_put_failure;
+ }
+ if (n->res.classid &&
+ nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
+ goto nla_put_failure;
+
+ ht_down = rtnl_dereference(n->ht_down);
+ if (ht_down &&
+ nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
+ goto nla_put_failure;
+
+ if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
+ goto nla_put_failure;
+
+#ifdef CONFIG_CLS_U32_MARK
+ if ((n->val || n->mask)) {
+ struct tc_u32_mark mark = {.val = n->val,
+ .mask = n->mask,
+ .success = 0};
+ int cpum;
+
+ for_each_possible_cpu(cpum) {
+ __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
+
+ mark.success += cnt;
+ }
+
+ if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
+ goto nla_put_failure;
+ }
+#endif
+
+ if (tcf_exts_dump(skb, &n->exts) < 0)
+ goto nla_put_failure;
+
+#ifdef CONFIG_NET_CLS_IND
+ if (n->ifindex) {
+ struct net_device *dev;
+ dev = __dev_get_by_index(net, n->ifindex);
+ if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
+ goto nla_put_failure;
+ }
+#endif
+#ifdef CONFIG_CLS_U32_PERF
+ gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
+ n->sel.nkeys * sizeof(u64),
+ GFP_KERNEL);
+ if (!gpf)
+ goto nla_put_failure;
+
+ for_each_possible_cpu(cpu) {
+ int i;
+ struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
+
+ gpf->rcnt += pf->rcnt;
+ gpf->rhit += pf->rhit;
+ for (i = 0; i < n->sel.nkeys; i++)
+ gpf->kcnts[i] += pf->kcnts[i];
+ }
+
+ if (nla_put_64bit(skb, TCA_U32_PCNT,
+ sizeof(struct tc_u32_pcnt) +
+ n->sel.nkeys * sizeof(u64),
+ gpf, TCA_U32_PAD)) {
+ kfree(gpf);
+ goto nla_put_failure;
+ }
+ kfree(gpf);
+#endif
+ }
+
+ nla_nest_end(skb, nest);
+
+ if (TC_U32_KEY(n->handle))
+ if (tcf_exts_dump_stats(skb, &n->exts) < 0)
+ goto nla_put_failure;
+ return skb->len;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -1;
+}
+
+static struct tcf_proto_ops cls_u32_ops __read_mostly = {
+ .kind = "u32",
+ .classify = u32_classify,
+ .init = u32_init,
+ .destroy = u32_destroy,
+ .get = u32_get,
+ .change = u32_change,
+ .delete = u32_delete,
+ .walk = u32_walk,
+ .reoffload = u32_reoffload,
+ .dump = u32_dump,
+ .bind_class = u32_bind_class,
+ .owner = THIS_MODULE,
+};
+
+static int __init init_u32(void)
+{
+ int i, ret;
+
+ pr_info("u32 classifier\n");
+#ifdef CONFIG_CLS_U32_PERF
+ pr_info(" Performance counters on\n");
+#endif
+#ifdef CONFIG_NET_CLS_IND
+ pr_info(" input device check on\n");
+#endif
+#ifdef CONFIG_NET_CLS_ACT
+ pr_info(" Actions configured\n");
+#endif
+ tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
+ sizeof(struct hlist_head),
+ GFP_KERNEL);
+ if (!tc_u_common_hash)
+ return -ENOMEM;
+
+ for (i = 0; i < U32_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&tc_u_common_hash[i]);
+
+ ret = register_tcf_proto_ops(&cls_u32_ops);
+ if (ret)
+ kvfree(tc_u_common_hash);
+ return ret;
+}
+
+static void __exit exit_u32(void)
+{
+ unregister_tcf_proto_ops(&cls_u32_ops);
+ kvfree(tc_u_common_hash);
+}
+
+module_init(init_u32)
+module_exit(exit_u32)
+MODULE_LICENSE("GPL");