This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / sched / em_nbyte.c

diff --git a/net/sched/em_nbyte.c b/net/sched/em_nbyte.c
new file mode 100644 (file)
index 0000000..71ea926
--- /dev/null
+++ b/net/sched/em_nbyte.c
@@ -0,0 +1,82 @@
+/*
+ * net/sched/em_nbyte.c        N-Byte 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>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/tc_ematch/tc_em_nbyte.h>
+#include <net/pkt_cls.h>
+
+struct nbyte_data
+{
+       struct tcf_em_nbyte     hdr;
+       char                    pattern[0];
+};
+       
+static int em_nbyte_change(struct tcf_proto *tp, void *data, int data_len,
+                          struct tcf_ematch *em)
+{
+       struct tcf_em_nbyte *nbyte = data;
+
+       if (data_len < sizeof(*nbyte) ||
+           data_len < (sizeof(*nbyte) + nbyte->len))
+               return -EINVAL;
+
+       em->datalen = sizeof(*nbyte) + nbyte->len;
+       em->data = (unsigned long) kmalloc(em->datalen, GFP_KERNEL);
+       if (em->data == 0UL)
+               return -ENOBUFS;
+
+       memcpy((void *) em->data, data, em->datalen);
+
+       return 0;
+}
+
+static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
+                         struct tcf_pkt_info *info)
+{
+       struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
+       unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
+
+       ptr += nbyte->hdr.off;
+
+       if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
+               return 0;
+
+       return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len);
+}
+
+static struct tcf_ematch_ops em_nbyte_ops = {
+       .kind     = TCF_EM_NBYTE,
+       .change   = em_nbyte_change,
+       .match    = em_nbyte_match,
+       .owner    = THIS_MODULE,
+       .link     = LIST_HEAD_INIT(em_nbyte_ops.link)
+};
+
+static int __init init_em_nbyte(void)
+{
+       return tcf_em_register(&em_nbyte_ops);
+}
+
+static void __exit exit_em_nbyte(void) 
+{
+       tcf_em_unregister(&em_nbyte_ops);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(init_em_nbyte);
+module_exit(exit_em_nbyte);