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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/em_nbyte.c N-Byte ematch
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/gfp.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/string.h>
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#include <linux/skbuff.h>
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#include <linux/tc_ematch/tc_em_nbyte.h>
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#include <net/pkt_cls.h>
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struct nbyte_data {
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struct tcf_em_nbyte hdr;
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char pattern[0];
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};
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static int em_nbyte_change(struct net *net, void *data, int data_len,
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struct tcf_ematch *em)
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{
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struct tcf_em_nbyte *nbyte = data;
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if (data_len < sizeof(*nbyte) ||
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data_len < (sizeof(*nbyte) + nbyte->len))
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return -EINVAL;
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em->datalen = sizeof(*nbyte) + nbyte->len;
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em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
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if (em->data == 0UL)
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return -ENOBUFS;
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return 0;
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}
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static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
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struct tcf_pkt_info *info)
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{
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struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
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unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
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ptr += nbyte->hdr.off;
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if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
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return 0;
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return !memcmp(ptr, nbyte->pattern, nbyte->hdr.len);
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}
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static struct tcf_ematch_ops em_nbyte_ops = {
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.kind = TCF_EM_NBYTE,
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.change = em_nbyte_change,
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.match = em_nbyte_match,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_nbyte_ops.link)
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};
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static int __init init_em_nbyte(void)
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{
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return tcf_em_register(&em_nbyte_ops);
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}
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static void __exit exit_em_nbyte(void)
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{
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tcf_em_unregister(&em_nbyte_ops);
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}
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MODULE_LICENSE("GPL");
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module_init(init_em_nbyte);
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module_exit(exit_em_nbyte);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
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