1016 строки
23 KiB
C
1016 строки
23 KiB
C
/*
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* net/sched/em_meta.c Metadata ematch
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*
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* ==========================================================================
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*
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* The metadata ematch compares two meta objects where each object
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* represents either a meta value stored in the kernel or a static
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* value provided by userspace. The objects are not provided by
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* userspace itself but rather a definition providing the information
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* to build them. Every object is of a certain type which must be
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* equal to the object it is being compared to.
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*
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* The definition of a objects conists of the type (meta type), a
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* identifier (meta id) and additional type specific information.
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* The meta id is either TCF_META_TYPE_VALUE for values provided by
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* userspace or a index to the meta operations table consisting of
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* function pointers to type specific meta data collectors returning
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* the value of the requested meta value.
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*
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* lvalue rvalue
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* +-----------+ +-----------+
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* | type: INT | | type: INT |
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* def | id: DEV | | id: VALUE |
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* | data: | | data: 3 |
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* +-----------+ +-----------+
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* | |
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* ---> meta_ops[INT][DEV](...) |
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* | |
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* ----------- |
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* V V
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* +-----------+ +-----------+
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* | type: INT | | type: INT |
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* obj | id: DEV | | id: VALUE |
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* | data: 2 |<--data got filled out | data: 3 |
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* +-----------+ +-----------+
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* | |
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* --------------> 2 equals 3 <--------------
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*
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* This is a simplified schema, the complexity varies depending
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* on the meta type. Obviously, the length of the data must also
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* be provided for non-numeric types.
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*
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* Additionally, type dependent modifiers such as shift operators
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* or mask may be applied to extend the functionaliy. As of now,
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* the variable length type supports shifting the byte string to
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* the right, eating up any number of octets and thus supporting
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* wildcard interface name comparisons such as "ppp%" matching
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* ppp0..9.
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*
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* NOTE: Certain meta values depend on other subsystems and are
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* only available if that subsystem is enabled in the kernel.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched/loadavg.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/random.h>
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#include <linux/if_vlan.h>
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#include <linux/tc_ematch/tc_em_meta.h>
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#include <net/dst.h>
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#include <net/route.h>
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#include <net/pkt_cls.h>
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#include <net/sock.h>
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struct meta_obj {
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unsigned long value;
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unsigned int len;
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};
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struct meta_value {
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struct tcf_meta_val hdr;
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unsigned long val;
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unsigned int len;
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};
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struct meta_match {
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struct meta_value lvalue;
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struct meta_value rvalue;
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};
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static inline int meta_id(struct meta_value *v)
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{
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return TCF_META_ID(v->hdr.kind);
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}
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static inline int meta_type(struct meta_value *v)
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{
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return TCF_META_TYPE(v->hdr.kind);
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}
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#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
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struct tcf_pkt_info *info, struct meta_value *v, \
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struct meta_obj *dst, int *err)
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/**************************************************************************
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* System status & misc
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**************************************************************************/
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META_COLLECTOR(int_random)
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{
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get_random_bytes(&dst->value, sizeof(dst->value));
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}
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static inline unsigned long fixed_loadavg(int load)
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{
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int rnd_load = load + (FIXED_1/200);
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int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
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return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
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}
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META_COLLECTOR(int_loadavg_0)
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{
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dst->value = fixed_loadavg(avenrun[0]);
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}
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META_COLLECTOR(int_loadavg_1)
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{
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dst->value = fixed_loadavg(avenrun[1]);
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}
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META_COLLECTOR(int_loadavg_2)
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{
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dst->value = fixed_loadavg(avenrun[2]);
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}
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/**************************************************************************
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* Device names & indices
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**************************************************************************/
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static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
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{
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if (unlikely(dev == NULL))
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return -1;
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dst->value = dev->ifindex;
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return 0;
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}
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static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
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{
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if (unlikely(dev == NULL))
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return -1;
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dst->value = (unsigned long) dev->name;
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dst->len = strlen(dev->name);
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return 0;
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}
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META_COLLECTOR(int_dev)
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{
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*err = int_dev(skb->dev, dst);
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}
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META_COLLECTOR(var_dev)
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{
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*err = var_dev(skb->dev, dst);
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}
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/**************************************************************************
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* vlan tag
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**************************************************************************/
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META_COLLECTOR(int_vlan_tag)
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{
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unsigned short tag;
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if (skb_vlan_tag_present(skb))
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dst->value = skb_vlan_tag_get(skb);
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else if (!__vlan_get_tag(skb, &tag))
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dst->value = tag;
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else
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*err = -1;
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}
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/**************************************************************************
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* skb attributes
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**************************************************************************/
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META_COLLECTOR(int_priority)
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{
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dst->value = skb->priority;
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}
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META_COLLECTOR(int_protocol)
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{
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/* Let userspace take care of the byte ordering */
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dst->value = tc_skb_protocol(skb);
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}
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META_COLLECTOR(int_pkttype)
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{
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dst->value = skb->pkt_type;
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}
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META_COLLECTOR(int_pktlen)
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{
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dst->value = skb->len;
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}
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META_COLLECTOR(int_datalen)
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{
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dst->value = skb->data_len;
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}
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META_COLLECTOR(int_maclen)
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{
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dst->value = skb->mac_len;
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}
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META_COLLECTOR(int_rxhash)
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{
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dst->value = skb_get_hash(skb);
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}
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/**************************************************************************
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* Netfilter
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**************************************************************************/
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META_COLLECTOR(int_mark)
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{
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dst->value = skb->mark;
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}
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/**************************************************************************
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* Traffic Control
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**************************************************************************/
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META_COLLECTOR(int_tcindex)
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{
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dst->value = skb->tc_index;
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}
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/**************************************************************************
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* Routing
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**************************************************************************/
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META_COLLECTOR(int_rtclassid)
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{
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if (unlikely(skb_dst(skb) == NULL))
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*err = -1;
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else
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#ifdef CONFIG_IP_ROUTE_CLASSID
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dst->value = skb_dst(skb)->tclassid;
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#else
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dst->value = 0;
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#endif
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}
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META_COLLECTOR(int_rtiif)
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{
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if (unlikely(skb_rtable(skb) == NULL))
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*err = -1;
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else
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dst->value = inet_iif(skb);
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}
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/**************************************************************************
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* Socket Attributes
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**************************************************************************/
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#define skip_nonlocal(skb) \
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(unlikely(skb->sk == NULL))
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META_COLLECTOR(int_sk_family)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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dst->value = skb->sk->sk_family;
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}
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META_COLLECTOR(int_sk_state)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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dst->value = skb->sk->sk_state;
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}
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META_COLLECTOR(int_sk_reuse)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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dst->value = skb->sk->sk_reuse;
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}
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META_COLLECTOR(int_sk_bound_if)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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/* No error if bound_dev_if is 0, legal userspace check */
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dst->value = skb->sk->sk_bound_dev_if;
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}
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META_COLLECTOR(var_sk_bound_if)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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if (skb->sk->sk_bound_dev_if == 0) {
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dst->value = (unsigned long) "any";
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dst->len = 3;
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} else {
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struct net_device *dev;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(sock_net(skb->sk),
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skb->sk->sk_bound_dev_if);
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*err = var_dev(dev, dst);
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rcu_read_unlock();
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}
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}
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META_COLLECTOR(int_sk_refcnt)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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dst->value = refcount_read(&skb->sk->sk_refcnt);
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}
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META_COLLECTOR(int_sk_rcvbuf)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_rcvbuf;
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}
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META_COLLECTOR(int_sk_shutdown)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_shutdown;
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}
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META_COLLECTOR(int_sk_proto)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_protocol;
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}
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META_COLLECTOR(int_sk_type)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_type;
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}
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META_COLLECTOR(int_sk_rmem_alloc)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk_rmem_alloc_get(sk);
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}
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META_COLLECTOR(int_sk_wmem_alloc)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk_wmem_alloc_get(sk);
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}
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META_COLLECTOR(int_sk_omem_alloc)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = atomic_read(&sk->sk_omem_alloc);
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}
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META_COLLECTOR(int_sk_rcv_qlen)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_receive_queue.qlen;
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}
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META_COLLECTOR(int_sk_snd_qlen)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_write_queue.qlen;
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}
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META_COLLECTOR(int_sk_wmem_queued)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_wmem_queued;
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}
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META_COLLECTOR(int_sk_fwd_alloc)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_forward_alloc;
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}
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META_COLLECTOR(int_sk_sndbuf)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_sndbuf;
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}
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META_COLLECTOR(int_sk_alloc)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = (__force int) sk->sk_allocation;
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}
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META_COLLECTOR(int_sk_hash)
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{
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if (skip_nonlocal(skb)) {
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*err = -1;
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return;
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}
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dst->value = skb->sk->sk_hash;
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}
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META_COLLECTOR(int_sk_lingertime)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_lingertime / HZ;
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}
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META_COLLECTOR(int_sk_err_qlen)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_error_queue.qlen;
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}
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META_COLLECTOR(int_sk_ack_bl)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_ack_backlog;
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}
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META_COLLECTOR(int_sk_max_ack_bl)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_max_ack_backlog;
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}
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META_COLLECTOR(int_sk_prio)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_priority;
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}
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META_COLLECTOR(int_sk_rcvlowat)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_rcvlowat;
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}
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META_COLLECTOR(int_sk_rcvtimeo)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_rcvtimeo / HZ;
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}
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META_COLLECTOR(int_sk_sndtimeo)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_sndtimeo / HZ;
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}
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META_COLLECTOR(int_sk_sendmsg_off)
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{
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const struct sock *sk = skb_to_full_sk(skb);
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if (!sk) {
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*err = -1;
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return;
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}
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dst->value = sk->sk_frag.offset;
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}
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META_COLLECTOR(int_sk_write_pend)
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|
{
|
|
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_deprecated(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);
|