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95 lines
2.1 KiB
95 lines
2.1 KiB
7 months ago
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/*
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* lib/route/cls/ematch/cmp.c Simple packet data comparison ematch
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2008-2013 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup ematch
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* @defgroup em_cmp Simple packet data comparison
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*
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* @{
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*/
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#include <netlink-private/netlink.h>
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#include <netlink-private/tc.h>
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#include <netlink/netlink.h>
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#include <netlink/route/cls/ematch.h>
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#include <netlink/route/cls/ematch/cmp.h>
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#include <linux/tc_ematch/tc_em_cmp.h>
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void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg)
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{
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memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg));
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}
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struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e)
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{
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return rtnl_ematch_data(e);
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}
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static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len)
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{
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memcpy(rtnl_ematch_data(e), data, len);
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return 0;
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}
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static const char *align_txt[] = {
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[TCF_EM_ALIGN_U8] = "u8",
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[TCF_EM_ALIGN_U16] = "u16",
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[TCF_EM_ALIGN_U32] = "u32"
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};
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static const char *layer_txt[] = {
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[TCF_LAYER_LINK] = "eth",
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[TCF_LAYER_NETWORK] = "ip",
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[TCF_LAYER_TRANSPORT] = "tcp"
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};
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static const char *operand_txt[] = {
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[TCF_EM_OPND_EQ] = "=",
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[TCF_EM_OPND_LT] = "<",
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[TCF_EM_OPND_GT] = ">",
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};
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static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
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{
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struct tcf_em_cmp *cmp = rtnl_ematch_data(e);
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if (cmp->flags & TCF_EM_CMP_TRANS)
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nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's');
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nl_dump(p, "%s at %s+%u",
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align_txt[cmp->align], layer_txt[cmp->layer], cmp->off);
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if (cmp->mask)
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nl_dump(p, " & 0x%x", cmp->mask);
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if (cmp->flags & TCF_EM_CMP_TRANS)
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nl_dump(p, ")");
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nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val);
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}
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static struct rtnl_ematch_ops cmp_ops = {
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.eo_kind = TCF_EM_CMP,
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.eo_name = "cmp",
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.eo_minlen = sizeof(struct tcf_em_cmp),
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.eo_datalen = sizeof(struct tcf_em_cmp),
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.eo_parse = cmp_parse,
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.eo_dump = cmp_dump,
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};
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static void __init cmp_init(void)
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{
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rtnl_ematch_register(&cmp_ops);
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}
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/** @} */
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