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Patrick McHardy wrote:
> Chris Wilson wrote:
>
>>
>> My proposed solution is a new Netfilter table which packets pass through
>> on their way out to a device.There would be just a single terminal
>> target,
>> CLASSIFY, which would enqueue the packet in the specified classifier.
>> Unclassified packets which drop off the end of the entry chain would
>> pass
>> on to the old-style tc filtering system, for backwards compatibility.
>>
>
> i think with netfilter table you mean iptables table. iptables can
> only see ip, so you still
> have the need for tc filters as they exist. The classify target can
> easily be made,
> just set skb->priority to the class id and the qdisc will take care of
> the rest. if your company
> wishes to sponsor me for writing one for you, go ahead ;)
sorry if my last mail sounded arrogant, i think you deserve honour for
beeing willing to sponsor linux QoS development.
As sign of my appologies, take this CLASSIFY target patch against latest
netfiler CVS ;) It is untested, but despite possible
easy-to-fix typos i hope it works. chmod +x
userspace/extensions/.CLASSIFY-test after applying the patch.
Usage is:
-j CLASSIFY --set-class MAJOR:MINOR
Bye,
Patrick
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diff -urN netfilter-clean/patch-o-matic/extra/CLASSIFY.patch netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch
--- netfilter-clean/patch-o-matic/extra/CLASSIFY.patch 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch 2003-01-25 02:41:19.000000000 +0100
@@ -0,0 +1,83 @@
+diff -urN linux-2.4.20-clean/include/linux/netfilter_ipv4/ipt_CLASSIFY.h linux-2.4.20_nfclassify/include/linux/netfilter_ipv4/ipt_CLASSIFY.h
+--- linux-2.4.20-clean/include/linux/netfilter_ipv4/ipt_CLASSIFY.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.4.20_nfclassify/include/linux/netfilter_ipv4/ipt_CLASSIFY.h 2003-01-25 02:11:35.000000000 +0100
+@@ -0,0 +1,8 @@
++#ifndef _IPT_CLASSIFY_H
++#define _IPT_CLASSIFY_H
++
++struct ipt_classify_target_info {
++ unsigned int priority;
++};
++
++#endif /*_IPT_CLASSIFY_H */
+diff -urN linux-2.4.20-clean/net/ipv4/netfilter/ipt_CLASSIFY.c linux-2.4.20_nfclassify/net/ipv4/netfilter/ipt_CLASSIFY.c
+--- linux-2.4.20-clean/net/ipv4/netfilter/ipt_CLASSIFY.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.4.20_nfclassify/net/ipv4/netfilter/ipt_CLASSIFY.c 2003-01-25 02:09:36.000000000 +0100
+@@ -0,0 +1,67 @@
++/* This is a module which is used for setting the skb->priority field of an skb for qdisc classification. */
++#include <linux/module.h>
++#include <linux/skbuff.h>
++#include <linux/ip.h>
++#include <net/checksum.h>
++
++#include <linux/netfilter_ipv4/ip_tables.h>
++#include <linux/netfilter_ipv4/ipt_CLASSIFY.h>
++
++static unsigned int
++target(struct sk_buff **pskb,
++ unsigned int hooknum,
++ const struct net_device *in,
++ const struct net_device *out,
++ const void *targinfo,
++ void *userinfo)
++{
++ const struct ipt_classify_target_info *clinfo = targinfo;
++
++ if((*pskb)->priority != clinfo->priority) {
++ (*pskb)->priority = clinfo->priority;
++ (*pskb)->nfcache |= NFC_ALTERED;
++ }
++ return IPT_CONTINUE;
++}
++
++static int
++checkentry(const char *tablename,
++ const struct ipt_entry *e,
++ void *targinfo,
++ unsigned int targinfosize,
++ unsigned int hook_mask)
++{
++ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_classify_target_info))) {
++ printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
++ targinfosize,
++ IPT_ALIGN(sizeof(struct ipt_classify_target_info)));
++ return 0;
++ }
++
++ if (strcmp(tablename, "mangle") != 0) {
++ printk(KERN_WARNING "CLASSIFY: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
++ return 0;
++ }
++
++ return 1;
++}
++
++static struct ipt_target ipt_classify_reg
++= { { NULL, NULL }, "CLASSIFY", target, checkentry, NULL, THIS_MODULE };
++
++static int __init init(void)
++{
++ if (ipt_register_target(&ipt_classify_reg))
++ return -EINVAL;
++
++ return 0;
++}
++
++static void __exit fini(void)
++{
++ ipt_unregister_target(&ipt_classify_reg);
++}
++
++module_init(init);
++module_exit(fini);
++MODULE_LICENSE("GPL");
diff -urN netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.config.in netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.config.in
--- netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.config.in 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.config.in 2003-01-25 02:45:03.000000000 +0100
@@ -0,0 +1,2 @@
+ dep_tristate ' MIRROR target support (EXPERIMENTAL)' CONFIG_IP_NF_TARGET_MIRROR $CONFIG_IP_NF_FILTER
+ dep_tristate ' CLASSIFY target support (EXPERIMENTAL)' CONFIG_IP_NF_TARGET_CLASSIFY $CONFIG_IP_NF_FILTER
diff -urN netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.help netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.help
--- netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.help 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.help 2003-01-25 02:42:39.000000000 +0100
@@ -0,0 +1,5 @@
+Author: Patrick McHardy <kaber@trash.net>
+Status: untested
+
+This patch adds support for the CLASSIFY target which sets skb->priority.
+Some qdiscs can use this value for classifying packets.
diff -urN netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.makefile netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.makefile
--- netfilter-clean/patch-o-matic/extra/CLASSIFY.patch.makefile 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/patch-o-matic/extra/CLASSIFY.patch.makefile 2003-01-25 02:44:26.000000000 +0100
@@ -0,0 +1,2 @@
+obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
+obj-$(CONFIG_IP_NF_TARGET_CLASSIFY) += ipt_CLASSIFY.o
diff -urN netfilter-clean/userspace/extensions/.CLASSIFY-test netfilter_nfclassify/userspace/extensions/.CLASSIFY-test
--- netfilter-clean/userspace/extensions/.CLASSIFY-test 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/userspace/extensions/.CLASSIFY-test 2003-01-25 02:40:41.000000000 +0100
@@ -0,0 +1,3 @@
+#! /bin/sh
+[ -f $KERNEL_DIR/net/ipv4/netfilter/ipt_CLASSIFY.c ] && echo CLASSIFY
+
diff -urN netfilter-clean/userspace/extensions/libipt_CLASSIFY.c netfilter_nfclassify/userspace/extensions/libipt_CLASSIFY.c
--- netfilter-clean/userspace/extensions/libipt_CLASSIFY.c 1970-01-01 01:00:00.000000000 +0100
+++ netfilter_nfclassify/userspace/extensions/libipt_CLASSIFY.c 2003-01-25 02:40:00.000000000 +0100
@@ -0,0 +1,125 @@
+/* Shared library add-on to iptables to add CLASSIFY target support. */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_CLASSIFY.h>
+#include <linux/pkt_sched.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"CLASSIFY target v%s options:\n"
+" --set-class [MAJOR:MINOR] Set skb->priority value\n"
+"\n",
+IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+ { "set-class", 1, 0, '1' },
+ { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+}
+
+unsigned int string_to_priority(const unsigned char *s)
+{
+ char *t;
+
+ if ((t = strstr(s, ":")) == NULL)
+ return atoi(s);
+ *t = '\0';
+ return TC_H_MAKE(atoi(s) << 16, atoi(t+1));
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const struct ipt_entry *entry,
+ struct ipt_entry_target **target)
+{
+ struct ipt_classify_target_info *clinfo
+ = (struct ipt_classify_target_info *)(*target)->data;
+
+ switch (c) {
+ case '1':
+ clinfo->priority = string_to_priority(optarg);
+ if (*flags)
+ exit_error(PARAMETER_PROBLEM,
+ "CLASSIFY: Can't specify --set-class twice");
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "CLASSIFY: Parameter --set-class is required");
+}
+
+static void
+print_class(unsigned int priority, int numeric)
+{
+ printf("%.4x:%.4x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority));
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_target *target,
+ int numeric)
+{
+ const struct ipt_classify_target_info *clinfo =
+ (const struct ipt_classify_target_info *)target->data;
+ printf("CLASSIFY set ");
+ print_class(clinfo->priority, numeric);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+ const struct ipt_classify_target_info *clinfo =
+ (const struct ipt_classify_target_info *)target->data;
+
+ printf("--set-class %.4x:%.4x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority));
+}
+
+static
+struct iptables_target classify
+= { NULL,
+ "CLASSIFY",
+ IPTABLES_VERSION,
+ IPT_ALIGN(sizeof(struct ipt_classify_target_info)),
+ IPT_ALIGN(sizeof(struct ipt_classify_target_info)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_target(&classify);
+}
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