Thomas Graf wrote:
diff -Nru linux-2.6.11-rc1-bk9.orig/net/sched/em_u32.c linux-2.6.11-rc1-bk9/net/sched/em_u32.c
--- linux-2.6.11-rc1-bk9.orig/net/sched/em_u32.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.11-rc1-bk9/net/sched/em_u32.c 2005-01-22 12:37:28.000000000 +0100
@@ -0,0 +1,58 @@
+/*
+ * net/sched/em_u32.c U32 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@xxxxxxx>
+ * Alexey Kuznetsov, <kuznet@xxxxxxxxxxxxx>
+ *
+ * Based on net/sched/cls_u32.c
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <net/pkt_cls.h>
+
+static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,
+ struct tcf_pkt_info *info)
+{
+ struct tc_u32_key *key = (struct tc_u32_key *) em->data;
+ unsigned char *ptr = skb->nh.raw;
+
+ if (info) {
+ if (info->ptr)
+ ptr = info->ptr;
+ ptr += (info->nexthdr & key->offmask);
+ }
+
+ return !((*(u32*) (ptr + key->off) ^ key->val) & key->mask);
This needs to make sure it stays inside the skb. I know cls_u32's checks
are pretty weak, but having nothing doesn't seem right.
+}
+
+static struct tcf_ematch_ops em_u32_ops = {
+ .kind = TCF_EM_U32,
+ .datalen = sizeof(struct tc_u32_key),
+ .match = em_u32_match,
+ .owner = THIS_MODULE,
+ .link = LIST_HEAD_INIT(em_u32_ops.link)
+};
+
+static int __init init_em_u32(void)
+{
+ return tcf_em_register(&em_u32_ops);
+}
+
+static void __exit exit_em_u32(void)
+{
+ tcf_em_unregister(&em_u32_ops);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(init_em_u32);
+module_exit(exit_em_u32);
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