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/*
* Copyright (c) 2018-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <stdio.h>
#include <stddef.h>
#include <sys/socket.h>
#include <linux/if_packet.h>
#include "print_fields.h"
static const char *errstr;
struct tp_stats {
unsigned int tp_packets, tp_drops, tp_freeze_q_cnt;
};
static long
get_tpacket_stats(void *optval, socklen_t *len)
{
struct tp_stats *tpstats = optval;
socklen_t optlen = *len;
long rc = getsockopt(-1, SOL_PACKET, PACKET_STATISTICS, tpstats, len);
errstr = sprintrc(rc);
#ifdef INJECT_RETVAL
if (rc != INJECT_RETVAL)
error_msg_and_fail("Got a return value of %ld != %d",
rc, INJECT_RETVAL);
static char inj_errstr[4096];
snprintf(inj_errstr, sizeof(inj_errstr), "%s (INJECTED)", errstr);
errstr = inj_errstr;
#endif
printf("getsockopt(-1, SOL_PACKET, PACKET_STATISTICS");
if (rc < 0 || optlen <= 0) {
printf(", %p", tpstats);
} else if (optlen < sizeof(tpstats->tp_packets)) {
printf(", {tp_packets=");
print_quoted_hex(tpstats, optlen);
printf("}");
} else {
printf(", {");
PRINT_FIELD_U(*tpstats, tp_packets);
if (optlen > offsetof(struct tp_stats, tp_drops)) {
optlen -= offsetof(struct tp_stats, tp_drops);
if (optlen < sizeof(tpstats->tp_drops)) {
printf(", tp_drops=");
print_quoted_hex(tpstats, optlen);
} else {
printf(", ");
PRINT_FIELD_U(*tpstats, tp_drops);
if (optlen > offsetof(struct tp_stats, tp_freeze_q_cnt) -
offsetof(struct tp_stats, tp_drops)) {
optlen -= offsetof(struct tp_stats, tp_freeze_q_cnt) -
offsetof(struct tp_stats, tp_drops);
if (optlen < sizeof(tpstats->tp_freeze_q_cnt)) {
printf(", tp_freeze_q_cnt=");
print_quoted_hex(tpstats, optlen);
} else {
printf(", ");
PRINT_FIELD_U(*tpstats, tp_freeze_q_cnt);
}
}
}
}
printf("}");
}
printf(", [%d]) = %s\n", *len, errstr);
return rc;
}
int
main(void)
{
TAIL_ALLOC_OBJECT_CONST_PTR(struct tp_stats, tp_stats);
TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
/* offset of (truncated) struct tp_stats.tp_packets */
const unsigned int offset_tp_packets = offsetofend(struct tp_stats, tp_packets);
const unsigned int tp_packets_truncated = offset_tp_packets - 1;
/* offset of (truncated) struct tp_stats.tp_drops */
const unsigned int offset_tp_drops = offsetofend(struct tp_stats, tp_drops);
const unsigned int tp_drops_truncated = offset_tp_drops - 1;
/* offset of (truncated) struct tp_stats.tp_freeze_q_cnt */
const unsigned int offset_tp_freeze_q_cnt = offsetofend(struct tp_stats, tp_freeze_q_cnt);
const unsigned int tp_freeze_q_cnt_truncated = offset_tp_freeze_q_cnt - 1;
*len = sizeof(*tp_stats);
/* classic getsockopt */
unsigned int optlen = *len;
get_tpacket_stats(tp_stats, &optlen);
/* getsockopt with zero optlen */
optlen = 0;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen less than offsetofend(struct tp_stats.tp_packets):
* the part of struct tp_stats.tp_packets is printed in hex.
*/
optlen = tp_packets_truncated;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen equals to offsetofend(struct tp_stats.tp_packets):
* struct tp_stats.tp_drops and struct tp_stats.offset_tp_freeze_q_cnt
* are not printed.
*/
optlen = offset_tp_packets;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen greater than offsetofend(struct tp_stats.tp_packets)
* but less than offsetofend(struct tp_stats, tp_drops):
* the part of struct tp_stats.tp_drops is printed in hex.
*/
optlen = tp_drops_truncated;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen equals to offsetofend(struct tp_stats.tp_drops):
* struct tp_stats.tp_freeze_q_cnt is not printed.
*/
optlen = offset_tp_drops;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen greater than offsetofend(struct tp_stats.tp_drops)
* but less than offsetofend(struct tp_stats, tp_freeze_q_cnt):
* the part of struct tp_stats.tp_freeze_q_cnt is printed in hex.
*/
optlen = tp_freeze_q_cnt_truncated;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen equals to offsetofend(struct tp_stats.tp_freeze_q_cnt):
*/
optlen = offset_tp_freeze_q_cnt;
get_tpacket_stats(tp_stats, &optlen);
/*
* getsockopt with optlen greater than sizeof(struct tp_stats)
*/
optlen = offset_tp_freeze_q_cnt + 1;
get_tpacket_stats(tp_stats, &optlen);
puts("+++ exited with 0 +++");
return 0;
}
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