forked from Minki/linux
2874c5fd28
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>
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/em_cmp.c Simple packet data comparison 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/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/tc_ematch/tc_em_cmp.h>
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#include <asm/unaligned.h>
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#include <net/pkt_cls.h>
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static inline int cmp_needs_transformation(struct tcf_em_cmp *cmp)
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{
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return unlikely(cmp->flags & TCF_EM_CMP_TRANS);
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}
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static int em_cmp_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 tcf_em_cmp *cmp = (struct tcf_em_cmp *) em->data;
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unsigned char *ptr = tcf_get_base_ptr(skb, cmp->layer) + cmp->off;
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u32 val = 0;
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if (!tcf_valid_offset(skb, ptr, cmp->align))
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return 0;
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switch (cmp->align) {
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case TCF_EM_ALIGN_U8:
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val = *ptr;
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break;
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case TCF_EM_ALIGN_U16:
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val = get_unaligned_be16(ptr);
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if (cmp_needs_transformation(cmp))
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val = be16_to_cpu(val);
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break;
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case TCF_EM_ALIGN_U32:
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/* Worth checking boundries? The branching seems
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* to get worse. Visit again.
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*/
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val = get_unaligned_be32(ptr);
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if (cmp_needs_transformation(cmp))
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val = be32_to_cpu(val);
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break;
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default:
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return 0;
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}
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if (cmp->mask)
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val &= cmp->mask;
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switch (cmp->opnd) {
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case TCF_EM_OPND_EQ:
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return val == cmp->val;
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case TCF_EM_OPND_LT:
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return val < cmp->val;
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case TCF_EM_OPND_GT:
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return val > cmp->val;
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}
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return 0;
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}
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static struct tcf_ematch_ops em_cmp_ops = {
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.kind = TCF_EM_CMP,
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.datalen = sizeof(struct tcf_em_cmp),
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.match = em_cmp_match,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_cmp_ops.link)
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};
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static int __init init_em_cmp(void)
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{
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return tcf_em_register(&em_cmp_ops);
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}
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static void __exit exit_em_cmp(void)
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{
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tcf_em_unregister(&em_cmp_ops);
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}
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MODULE_LICENSE("GPL");
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module_init(init_em_cmp);
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module_exit(exit_em_cmp);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_CMP);
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