/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mindaugas Rasiukevicius.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* NPF tests of BPF coprocessor.
*/

#ifdef _KERNEL
#include <sys/types.h>
#include <sys/endian.h>
#endif

#define NPF_BPFCOP
#include "npf_impl.h"
#include "npf_test.h"

static bool     lverbose = false;

static int
test_bpf_code(void *code, size_t size)
{
       uint32_t memstore[BPF_MEMWORDS];
       bpf_args_t bc_args;
       npf_cache_t *npc;
       struct mbuf *m;
       int ret, jret;
       void *jcode;

       /* Layer 3 (IP + TCP). */
       m = mbuf_get_pkt(AF_INET, IPPROTO_TCP,
           "192.168.2.100", "10.0.0.1", 15000, 80);
       npc = get_cached_pkt(m, NULL, NPF_RULE_LAYER_3);
#ifdef _NPF_STANDALONE
       bc_args.pkt = (const uint8_t *)nbuf_dataptr(npc->npc_nbuf);
#else
       bc_args.pkt = (const uint8_t *)m;
#endif
       bc_args.buflen = m_length(m);
       bc_args.wirelen = bc_args.buflen;
       bc_args.mem = memstore;
       bc_args.arg = npc;

       ret = npf_bpf_filter(&bc_args, code, NULL);

       /* JIT-compiled code. */
       jcode = npf_bpf_compile(code, size);
       if (jcode) {
               jret = npf_bpf_filter(&bc_args, NULL, jcode);
               assert(ret == jret); (void)jret;
               bpf_jit_freecode(jcode);
       } else if (lverbose) {
               printf("JIT-compilation failed\n");
       }
       put_cached_pkt(npc);
       return ret;
}

static uint32_t
npf_bpfcop_run(unsigned reg)
{
       struct bpf_insn insns_npf_bpfcop[] = {
               BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3),
               BPF_STMT(BPF_LD+BPF_W+BPF_MEM, reg),
               BPF_STMT(BPF_RET+BPF_A, 0),
       };
       return test_bpf_code(&insns_npf_bpfcop, sizeof(insns_npf_bpfcop));
}

static bool
npf_bpfcop_test(void)
{
       /* A <- IP version (4 or 6) */
       struct bpf_insn insns_ipver[] = {
               BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3),
               BPF_STMT(BPF_RET+BPF_A, 0),
       };
       CHECK_TRUE(test_bpf_code(&insns_ipver, sizeof(insns_ipver)) == IPVERSION);

       /* BPF_MW_IPVERI <- IP version */
       CHECK_TRUE(npf_bpfcop_run(BPF_MW_IPVER) == IPVERSION);

       /* BPF_MW_L4OFF <- L4 header offset */
       CHECK_TRUE(npf_bpfcop_run(BPF_MW_L4OFF) == sizeof(struct ip));

       /* BPF_MW_L4PROTO <- L4 protocol */
       CHECK_TRUE(npf_bpfcop_run(BPF_MW_L4PROTO) == IPPROTO_TCP);

       return true;
}

bool
npf_bpf_test(bool verbose)
{
       lverbose = verbose;
       return npf_bpfcop_test();
}