v4.19.13 snapshot.
diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
new file mode 100644
index 0000000..d6e9711
--- /dev/null
+++ b/net/sched/em_meta.c
@@ -0,0 +1,1014 @@
+/*
+ * net/sched/em_meta.c Metadata ematch
+ *
+ * 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: Thomas Graf <tgraf@suug.ch>
+ *
+ * ==========================================================================
+ *
+ * The metadata ematch compares two meta objects where each object
+ * represents either a meta value stored in the kernel or a static
+ * value provided by userspace. The objects are not provided by
+ * userspace itself but rather a definition providing the information
+ * to build them. Every object is of a certain type which must be
+ * equal to the object it is being compared to.
+ *
+ * The definition of a objects conists of the type (meta type), a
+ * identifier (meta id) and additional type specific information.
+ * The meta id is either TCF_META_TYPE_VALUE for values provided by
+ * userspace or a index to the meta operations table consisting of
+ * function pointers to type specific meta data collectors returning
+ * the value of the requested meta value.
+ *
+ * lvalue rvalue
+ * +-----------+ +-----------+
+ * | type: INT | | type: INT |
+ * def | id: DEV | | id: VALUE |
+ * | data: | | data: 3 |
+ * +-----------+ +-----------+
+ * | |
+ * ---> meta_ops[INT][DEV](...) |
+ * | |
+ * ----------- |
+ * V V
+ * +-----------+ +-----------+
+ * | type: INT | | type: INT |
+ * obj | id: DEV | | id: VALUE |
+ * | data: 2 |<--data got filled out | data: 3 |
+ * +-----------+ +-----------+
+ * | |
+ * --------------> 2 equals 3 <--------------
+ *
+ * This is a simplified schema, the complexity varies depending
+ * on the meta type. Obviously, the length of the data must also
+ * be provided for non-numeric types.
+ *
+ * Additionally, type dependent modifiers such as shift operators
+ * or mask may be applied to extend the functionaliy. As of now,
+ * the variable length type supports shifting the byte string to
+ * the right, eating up any number of octets and thus supporting
+ * wildcard interface name comparisons such as "ppp%" matching
+ * ppp0..9.
+ *
+ * NOTE: Certain meta values depend on other subsystems and are
+ * only available if that subsystem is enabled in the kernel.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/loadavg.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/random.h>
+#include <linux/if_vlan.h>
+#include <linux/tc_ematch/tc_em_meta.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/pkt_cls.h>
+#include <net/sock.h>
+
+struct meta_obj {
+ unsigned long value;
+ unsigned int len;
+};
+
+struct meta_value {
+ struct tcf_meta_val hdr;
+ unsigned long val;
+ unsigned int len;
+};
+
+struct meta_match {
+ struct meta_value lvalue;
+ struct meta_value rvalue;
+};
+
+static inline int meta_id(struct meta_value *v)
+{
+ return TCF_META_ID(v->hdr.kind);
+}
+
+static inline int meta_type(struct meta_value *v)
+{
+ return TCF_META_TYPE(v->hdr.kind);
+}
+
+#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
+ struct tcf_pkt_info *info, struct meta_value *v, \
+ struct meta_obj *dst, int *err)
+
+/**************************************************************************
+ * System status & misc
+ **************************************************************************/
+
+META_COLLECTOR(int_random)
+{
+ get_random_bytes(&dst->value, sizeof(dst->value));
+}
+
+static inline unsigned long fixed_loadavg(int load)
+{
+ int rnd_load = load + (FIXED_1/200);
+ int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
+
+ return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
+}
+
+META_COLLECTOR(int_loadavg_0)
+{
+ dst->value = fixed_loadavg(avenrun[0]);
+}
+
+META_COLLECTOR(int_loadavg_1)
+{
+ dst->value = fixed_loadavg(avenrun[1]);
+}
+
+META_COLLECTOR(int_loadavg_2)
+{
+ dst->value = fixed_loadavg(avenrun[2]);
+}
+
+/**************************************************************************
+ * Device names & indices
+ **************************************************************************/
+
+static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
+{
+ if (unlikely(dev == NULL))
+ return -1;
+
+ dst->value = dev->ifindex;
+ return 0;
+}
+
+static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
+{
+ if (unlikely(dev == NULL))
+ return -1;
+
+ dst->value = (unsigned long) dev->name;
+ dst->len = strlen(dev->name);
+ return 0;
+}
+
+META_COLLECTOR(int_dev)
+{
+ *err = int_dev(skb->dev, dst);
+}
+
+META_COLLECTOR(var_dev)
+{
+ *err = var_dev(skb->dev, dst);
+}
+
+/**************************************************************************
+ * vlan tag
+ **************************************************************************/
+
+META_COLLECTOR(int_vlan_tag)
+{
+ unsigned short tag;
+
+ if (skb_vlan_tag_present(skb))
+ dst->value = skb_vlan_tag_get(skb);
+ else if (!__vlan_get_tag(skb, &tag))
+ dst->value = tag;
+ else
+ *err = -1;
+}
+
+
+
+/**************************************************************************
+ * skb attributes
+ **************************************************************************/
+
+META_COLLECTOR(int_priority)
+{
+ dst->value = skb->priority;
+}
+
+META_COLLECTOR(int_protocol)
+{
+ /* Let userspace take care of the byte ordering */
+ dst->value = tc_skb_protocol(skb);
+}
+
+META_COLLECTOR(int_pkttype)
+{
+ dst->value = skb->pkt_type;
+}
+
+META_COLLECTOR(int_pktlen)
+{
+ dst->value = skb->len;
+}
+
+META_COLLECTOR(int_datalen)
+{
+ dst->value = skb->data_len;
+}
+
+META_COLLECTOR(int_maclen)
+{
+ dst->value = skb->mac_len;
+}
+
+META_COLLECTOR(int_rxhash)
+{
+ dst->value = skb_get_hash(skb);
+}
+
+/**************************************************************************
+ * Netfilter
+ **************************************************************************/
+
+META_COLLECTOR(int_mark)
+{
+ dst->value = skb->mark;
+}
+
+/**************************************************************************
+ * Traffic Control
+ **************************************************************************/
+
+META_COLLECTOR(int_tcindex)
+{
+ dst->value = skb->tc_index;
+}
+
+/**************************************************************************
+ * Routing
+ **************************************************************************/
+
+META_COLLECTOR(int_rtclassid)
+{
+ if (unlikely(skb_dst(skb) == NULL))
+ *err = -1;
+ else
+#ifdef CONFIG_IP_ROUTE_CLASSID
+ dst->value = skb_dst(skb)->tclassid;
+#else
+ dst->value = 0;
+#endif
+}
+
+META_COLLECTOR(int_rtiif)
+{
+ if (unlikely(skb_rtable(skb) == NULL))
+ *err = -1;
+ else
+ dst->value = inet_iif(skb);
+}
+
+/**************************************************************************
+ * Socket Attributes
+ **************************************************************************/
+
+#define skip_nonlocal(skb) \
+ (unlikely(skb->sk == NULL))
+
+META_COLLECTOR(int_sk_family)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ dst->value = skb->sk->sk_family;
+}
+
+META_COLLECTOR(int_sk_state)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ dst->value = skb->sk->sk_state;
+}
+
+META_COLLECTOR(int_sk_reuse)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ dst->value = skb->sk->sk_reuse;
+}
+
+META_COLLECTOR(int_sk_bound_if)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ /* No error if bound_dev_if is 0, legal userspace check */
+ dst->value = skb->sk->sk_bound_dev_if;
+}
+
+META_COLLECTOR(var_sk_bound_if)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+
+ if (skb->sk->sk_bound_dev_if == 0) {
+ dst->value = (unsigned long) "any";
+ dst->len = 3;
+ } else {
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(sock_net(skb->sk),
+ skb->sk->sk_bound_dev_if);
+ *err = var_dev(dev, dst);
+ rcu_read_unlock();
+ }
+}
+
+META_COLLECTOR(int_sk_refcnt)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ dst->value = refcount_read(&skb->sk->sk_refcnt);
+}
+
+META_COLLECTOR(int_sk_rcvbuf)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_rcvbuf;
+}
+
+META_COLLECTOR(int_sk_shutdown)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_shutdown;
+}
+
+META_COLLECTOR(int_sk_proto)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_protocol;
+}
+
+META_COLLECTOR(int_sk_type)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_type;
+}
+
+META_COLLECTOR(int_sk_rmem_alloc)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk_rmem_alloc_get(sk);
+}
+
+META_COLLECTOR(int_sk_wmem_alloc)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk_wmem_alloc_get(sk);
+}
+
+META_COLLECTOR(int_sk_omem_alloc)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = atomic_read(&sk->sk_omem_alloc);
+}
+
+META_COLLECTOR(int_sk_rcv_qlen)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_receive_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_snd_qlen)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_write_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_wmem_queued)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_wmem_queued;
+}
+
+META_COLLECTOR(int_sk_fwd_alloc)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_forward_alloc;
+}
+
+META_COLLECTOR(int_sk_sndbuf)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_sndbuf;
+}
+
+META_COLLECTOR(int_sk_alloc)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = (__force int) sk->sk_allocation;
+}
+
+META_COLLECTOR(int_sk_hash)
+{
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
+ dst->value = skb->sk->sk_hash;
+}
+
+META_COLLECTOR(int_sk_lingertime)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_lingertime / HZ;
+}
+
+META_COLLECTOR(int_sk_err_qlen)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_error_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_ack_bl)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_ack_backlog;
+}
+
+META_COLLECTOR(int_sk_max_ack_bl)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_max_ack_backlog;
+}
+
+META_COLLECTOR(int_sk_prio)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_priority;
+}
+
+META_COLLECTOR(int_sk_rcvlowat)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_rcvlowat;
+}
+
+META_COLLECTOR(int_sk_rcvtimeo)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_rcvtimeo / HZ;
+}
+
+META_COLLECTOR(int_sk_sndtimeo)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_sndtimeo / HZ;
+}
+
+META_COLLECTOR(int_sk_sendmsg_off)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_frag.offset;
+}
+
+META_COLLECTOR(int_sk_write_pend)
+{
+ const struct sock *sk = skb_to_full_sk(skb);
+
+ if (!sk) {
+ *err = -1;
+ return;
+ }
+ dst->value = sk->sk_write_pending;
+}
+
+/**************************************************************************
+ * Meta value collectors assignment table
+ **************************************************************************/
+
+struct meta_ops {
+ void (*get)(struct sk_buff *, struct tcf_pkt_info *,
+ struct meta_value *, struct meta_obj *, int *);
+};
+
+#define META_ID(name) TCF_META_ID_##name
+#define META_FUNC(name) { .get = meta_##name }
+
+/* Meta value operations table listing all meta value collectors and
+ * assigns them to a type and meta id. */
+static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
+ [TCF_META_TYPE_VAR] = {
+ [META_ID(DEV)] = META_FUNC(var_dev),
+ [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
+ },
+ [TCF_META_TYPE_INT] = {
+ [META_ID(RANDOM)] = META_FUNC(int_random),
+ [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
+ [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
+ [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
+ [META_ID(DEV)] = META_FUNC(int_dev),
+ [META_ID(PRIORITY)] = META_FUNC(int_priority),
+ [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
+ [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
+ [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
+ [META_ID(DATALEN)] = META_FUNC(int_datalen),
+ [META_ID(MACLEN)] = META_FUNC(int_maclen),
+ [META_ID(NFMARK)] = META_FUNC(int_mark),
+ [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
+ [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
+ [META_ID(RTIIF)] = META_FUNC(int_rtiif),
+ [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
+ [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
+ [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
+ [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
+ [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
+ [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
+ [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
+ [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
+ [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
+ [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
+ [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
+ [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
+ [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
+ [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
+ [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
+ [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
+ [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
+ [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
+ [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
+ [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
+ [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
+ [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
+ [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
+ [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
+ [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
+ [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
+ [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
+ [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
+ [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
+ [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
+ [META_ID(RXHASH)] = META_FUNC(int_rxhash),
+ }
+};
+
+static inline struct meta_ops *meta_ops(struct meta_value *val)
+{
+ return &__meta_ops[meta_type(val)][meta_id(val)];
+}
+
+/**************************************************************************
+ * Type specific operations for TCF_META_TYPE_VAR
+ **************************************************************************/
+
+static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
+{
+ int r = a->len - b->len;
+
+ if (r == 0)
+ r = memcmp((void *) a->value, (void *) b->value, a->len);
+
+ return r;
+}
+
+static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
+{
+ int len = nla_len(nla);
+
+ dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
+ if (dst->val == 0UL)
+ return -ENOMEM;
+ dst->len = len;
+ return 0;
+}
+
+static void meta_var_destroy(struct meta_value *v)
+{
+ kfree((void *) v->val);
+}
+
+static void meta_var_apply_extras(struct meta_value *v,
+ struct meta_obj *dst)
+{
+ int shift = v->hdr.shift;
+
+ if (shift && shift < dst->len)
+ dst->len -= shift;
+}
+
+static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
+{
+ if (v->val && v->len &&
+ nla_put(skb, tlv, v->len, (void *) v->val))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+/**************************************************************************
+ * Type specific operations for TCF_META_TYPE_INT
+ **************************************************************************/
+
+static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
+{
+ /* Let gcc optimize it, the unlikely is not really based on
+ * some numbers but jump free code for mismatches seems
+ * more logical. */
+ if (unlikely(a->value == b->value))
+ return 0;
+ else if (a->value < b->value)
+ return -1;
+ else
+ return 1;
+}
+
+static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
+{
+ if (nla_len(nla) >= sizeof(unsigned long)) {
+ dst->val = *(unsigned long *) nla_data(nla);
+ dst->len = sizeof(unsigned long);
+ } else if (nla_len(nla) == sizeof(u32)) {
+ dst->val = nla_get_u32(nla);
+ dst->len = sizeof(u32);
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+static void meta_int_apply_extras(struct meta_value *v,
+ struct meta_obj *dst)
+{
+ if (v->hdr.shift)
+ dst->value >>= v->hdr.shift;
+
+ if (v->val)
+ dst->value &= v->val;
+}
+
+static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
+{
+ if (v->len == sizeof(unsigned long)) {
+ if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
+ goto nla_put_failure;
+ } else if (v->len == sizeof(u32)) {
+ if (nla_put_u32(skb, tlv, v->val))
+ goto nla_put_failure;
+ }
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+/**************************************************************************
+ * Type specific operations table
+ **************************************************************************/
+
+struct meta_type_ops {
+ void (*destroy)(struct meta_value *);
+ int (*compare)(struct meta_obj *, struct meta_obj *);
+ int (*change)(struct meta_value *, struct nlattr *);
+ void (*apply_extras)(struct meta_value *, struct meta_obj *);
+ int (*dump)(struct sk_buff *, struct meta_value *, int);
+};
+
+static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
+ [TCF_META_TYPE_VAR] = {
+ .destroy = meta_var_destroy,
+ .compare = meta_var_compare,
+ .change = meta_var_change,
+ .apply_extras = meta_var_apply_extras,
+ .dump = meta_var_dump
+ },
+ [TCF_META_TYPE_INT] = {
+ .compare = meta_int_compare,
+ .change = meta_int_change,
+ .apply_extras = meta_int_apply_extras,
+ .dump = meta_int_dump
+ }
+};
+
+static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v)
+{
+ return &__meta_type_ops[meta_type(v)];
+}
+
+/**************************************************************************
+ * Core
+ **************************************************************************/
+
+static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
+ struct meta_value *v, struct meta_obj *dst)
+{
+ int err = 0;
+
+ if (meta_id(v) == TCF_META_ID_VALUE) {
+ dst->value = v->val;
+ dst->len = v->len;
+ return 0;
+ }
+
+ meta_ops(v)->get(skb, info, v, dst, &err);
+ if (err < 0)
+ return err;
+
+ if (meta_type_ops(v)->apply_extras)
+ meta_type_ops(v)->apply_extras(v, dst);
+
+ return 0;
+}
+
+static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
+ struct tcf_pkt_info *info)
+{
+ int r;
+ struct meta_match *meta = (struct meta_match *) m->data;
+ struct meta_obj l_value, r_value;
+
+ if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
+ meta_get(skb, info, &meta->rvalue, &r_value) < 0)
+ return 0;
+
+ r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
+
+ switch (meta->lvalue.hdr.op) {
+ case TCF_EM_OPND_EQ:
+ return !r;
+ case TCF_EM_OPND_LT:
+ return r < 0;
+ case TCF_EM_OPND_GT:
+ return r > 0;
+ }
+
+ return 0;
+}
+
+static void meta_delete(struct meta_match *meta)
+{
+ if (meta) {
+ const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
+
+ if (ops && ops->destroy) {
+ ops->destroy(&meta->lvalue);
+ ops->destroy(&meta->rvalue);
+ }
+ }
+
+ kfree(meta);
+}
+
+static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
+{
+ if (nla) {
+ if (nla_len(nla) == 0)
+ return -EINVAL;
+
+ return meta_type_ops(dst)->change(dst, nla);
+ }
+
+ return 0;
+}
+
+static inline int meta_is_supported(struct meta_value *val)
+{
+ return !meta_id(val) || meta_ops(val)->get;
+}
+
+static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
+ [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
+};
+
+static int em_meta_change(struct net *net, void *data, int len,
+ struct tcf_ematch *m)
+{
+ int err;
+ struct nlattr *tb[TCA_EM_META_MAX + 1];
+ struct tcf_meta_hdr *hdr;
+ struct meta_match *meta = NULL;
+
+ err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy, NULL);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ if (tb[TCA_EM_META_HDR] == NULL)
+ goto errout;
+ hdr = nla_data(tb[TCA_EM_META_HDR]);
+
+ if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
+ TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
+ TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
+ TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
+ goto errout;
+
+ meta = kzalloc(sizeof(*meta), GFP_KERNEL);
+ if (meta == NULL) {
+ err = -ENOMEM;
+ goto errout;
+ }
+
+ memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
+ memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
+
+ if (!meta_is_supported(&meta->lvalue) ||
+ !meta_is_supported(&meta->rvalue)) {
+ err = -EOPNOTSUPP;
+ goto errout;
+ }
+
+ if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
+ meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
+ goto errout;
+
+ m->datalen = sizeof(*meta);
+ m->data = (unsigned long) meta;
+
+ err = 0;
+errout:
+ if (err && meta)
+ meta_delete(meta);
+ return err;
+}
+
+static void em_meta_destroy(struct tcf_ematch *m)
+{
+ if (m)
+ meta_delete((struct meta_match *) m->data);
+}
+
+static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
+{
+ struct meta_match *meta = (struct meta_match *) em->data;
+ struct tcf_meta_hdr hdr;
+ const struct meta_type_ops *ops;
+
+ memset(&hdr, 0, sizeof(hdr));
+ memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
+ memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
+
+ if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
+ goto nla_put_failure;
+
+ ops = meta_type_ops(&meta->lvalue);
+ if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
+ ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static struct tcf_ematch_ops em_meta_ops = {
+ .kind = TCF_EM_META,
+ .change = em_meta_change,
+ .match = em_meta_match,
+ .destroy = em_meta_destroy,
+ .dump = em_meta_dump,
+ .owner = THIS_MODULE,
+ .link = LIST_HEAD_INIT(em_meta_ops.link)
+};
+
+static int __init init_em_meta(void)
+{
+ return tcf_em_register(&em_meta_ops);
+}
+
+static void __exit exit_em_meta(void)
+{
+ tcf_em_unregister(&em_meta_ops);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(init_em_meta);
+module_exit(exit_em_meta);
+
+MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);