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ci: Add unit test suite to validate tcp state transitions

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This commit is contained in:
Chen Yu Dong 2021-04-26 16:41:01 +08:00 committed by Simon Goldschmidt
parent a6874a46c6
commit f50c87da6f
6 changed files with 670 additions and 1 deletions
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1
test/unit/Filelists.cmake
View File

@ -31,6 +31,7 @@ set(LWIP_TESTFILES
${LWIP_TESTDIR}/mqtt/test_mqtt.c
${LWIP_TESTDIR}/tcp/tcp_helper.c
${LWIP_TESTDIR}/tcp/test_tcp_oos.c
${LWIP_TESTDIR}/tcp/test_tcp_state.c
${LWIP_TESTDIR}/tcp/test_tcp.c
${LWIP_TESTDIR}/udp/test_udp.c
${LWIP_TESTDIR}/ppp/test_pppos.c

1
test/unit/Filelists.mk
View File

@ -47,6 +47,7 @@ TESTFILES=$(TESTDIR)/lwip_unittests.c \
$(TESTDIR)/mqtt/test_mqtt.c \
$(TESTDIR)/tcp/tcp_helper.c \
$(TESTDIR)/tcp/test_tcp_oos.c \
$(TESTDIR)/tcp/test_tcp_state.c \
$(TESTDIR)/tcp/test_tcp.c \
$(TESTDIR)/udp/test_udp.c \
$(TESTDIR)/ppp/test_pppos.c

2
test/unit/lwip_unittests.c
View File

@ -5,6 +5,7 @@
#include "udp/test_udp.h"
#include "tcp/test_tcp.h"
#include "tcp/test_tcp_oos.h"
#include "tcp/test_tcp_state.h"
#include "core/test_def.h"
#include "core/test_dns.h"
#include "core/test_mem.h"
@ -79,6 +80,7 @@ int main(void)
udp_suite,
tcp_suite,
tcp_oos_suite,
tcp_state_suite,
def_suite,
dns_suite,
mem_suite,

7
test/unit/tcp/tcp_helper.c
View File

@ -25,7 +25,11 @@ tcp_remove(struct tcp_pcb* pcb_list)
while(pcb != NULL) {
pcb2 = pcb;
pcb = pcb->next;
tcp_abort(pcb2);
if (pcb2->state == LISTEN) {
tcp_close(pcb2);
} else {
tcp_abort(pcb2);
}
}
}
@ -260,6 +264,7 @@ void test_tcp_input(struct pbuf *p, struct netif *inp)
ip_addr_copy_from_ip4(*ip_current_src_addr(), iphdr->src);
ip_current_netif() = inp;
ip_data.current_ip4_header = iphdr;
ip_data.current_input_netif = inp;
/* since adding IPv6, p->payload must point to tcp header, not ip header */
pbuf_header(p, -(s16_t)sizeof(struct ip_hdr));

652
test/unit/tcp/test_tcp_state.c Normal file
View File

@ -0,0 +1,652 @@
#include "test_tcp_state.h"
#include "lwip/priv/tcp_priv.h"
#include "lwip/stats.h"
#include "tcp_helper.h"
#include "lwip/inet_chksum.h"
#ifdef _MSC_VER
#pragma warning(disable: 4307) /* we explicitly wrap around TCP seqnos */
#endif
#if !LWIP_STATS || !TCP_STATS || !MEMP_STATS
#error "This tests needs TCP- and MEMP-statistics enabled"
#endif
static struct netif test_netif = {0};
static struct test_tcp_txcounters test_txcounters = {0};
#define SEQNO1 (0xFFFFFF00 - TCP_MSS)
#define ISS 6510
static u8_t test_tcp_timer;
/* our own version of tcp_tmr so we can reset fast/slow timer state */
static void
test_tcp_tmr(void)
{
tcp_fasttmr();
if (++test_tcp_timer & 1) {
tcp_slowtmr();
}
}
/* Get TCP flags from packets */
static u8_t
get_tcp_flags_from_packet(struct pbuf *p, u16_t tcp_hdr_offset)
{
struct tcp_hdr tcphdr;
u16_t ret;
EXPECT_RETX(p != NULL, 0);
EXPECT_RETX(p->len >= tcp_hdr_offset + sizeof(struct tcp_hdr), 0);
ret = pbuf_copy_partial(p, &tcphdr, sizeof(struct tcp_hdr), tcp_hdr_offset);
EXPECT(ret == sizeof(struct tcp_hdr));
return TCPH_FLAGS(&tcphdr);
}
/* Create listening tcp_pcb */
static struct tcp_pcb_listen *
create_listening_pcb(u16_t local_port, struct test_tcp_counters *counters)
{
struct tcp_pcb *pcb;
struct tcp_pcb_listen *lpcb=NULL;
err_t err;
u16_t port = local_port?local_port:1234;
if (counters) {
pcb = test_tcp_new_counters_pcb(counters);
} else {
pcb = tcp_new();
}
EXPECT(pcb != NULL);
if (pcb) {
err = tcp_bind(pcb, &test_netif.ip_addr, port);
EXPECT(err == ERR_OK);
lpcb = (struct tcp_pcb_listen *)tcp_listen(pcb);
}
return lpcb;
}
/* Setups/teardown functions */
static void
tcp_state_setup(void)
{
struct tcp_pcb dummy_pcb; /* we need this for tcp_next_iss() only */
/* reset iss to default (6510) */
tcp_ticks = 0;
tcp_ticks = 0 - (tcp_next_iss(&dummy_pcb) - 6510);
tcp_next_iss(&dummy_pcb);
tcp_ticks = 0;
test_tcp_timer = 0;
/* initialize local vars */
test_tcp_init_netif(&test_netif, &test_txcounters, &test_local_ip, &test_netmask);
tcp_remove_all();
lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}
static void
tcp_state_teardown(void)
{
tcp_remove_all();
lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}
/* helper functions */
static void
test_rst_generation_with_incoming_packet(struct pbuf *p,
struct netif *netif, struct test_tcp_txcounters *tx_counters)
{
u16_t tcp_flags;
EXPECT_RET(p != NULL);
memset(tx_counters, 0, sizeof(struct test_tcp_txcounters));
/* pass the segment to tcp_input */
tx_counters->copy_tx_packets = 1;
test_tcp_input(p, netif);
tx_counters->copy_tx_packets = 0;
/* check if packets are as expected */
EXPECT(tx_counters->tx_packets != NULL);
if (tx_counters->tx_packets) {
tcp_flags = get_tcp_flags_from_packet(tx_counters->tx_packets, 20);
EXPECT(tcp_flags & TCP_RST);
pbuf_free(tx_counters->tx_packets);
tx_counters->tx_packets = NULL;
}
}
/* Test functions */
/* Call tcp_new() and test memp stats (max number) */
START_TEST(test_tcp_new_max_num)
{
struct tcp_pcb* pcb[MEMP_NUM_TCP_PCB + 1];
int i;
LWIP_UNUSED_ARG(_i);
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
for(i = 0;i < MEMP_NUM_TCP_PCB; i++) {
pcb[i] = tcp_new();
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == (i + 1));
}
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == MEMP_NUM_TCP_PCB);
/* Trying to remove the oldest pcb in TIME_WAIT,LAST_ACK,CLOSING state when pcb full */
pcb[MEMP_NUM_TCP_PCB] = tcp_new();
fail_unless(pcb[MEMP_NUM_TCP_PCB] == NULL);
tcp_set_state(pcb[0], TIME_WAIT, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
pcb[MEMP_NUM_TCP_PCB] = tcp_new();
fail_unless(pcb[MEMP_NUM_TCP_PCB] != NULL);
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == MEMP_NUM_TCP_PCB);
for (i = 1; i <= MEMP_NUM_TCP_PCB; i++)
{
tcp_abort(pcb[i]);
}
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/* pcbs in TIME_WAIT state will be deleted when creating new pcb reach the max number */
START_TEST(test_tcp_new_max_num_remove_TIME_WAIT)
{
struct tcp_pcb* pcb;
struct tcp_pcb* pcb_list[MEMP_NUM_TCP_PCB + 1];
int i;
/* create a pcb in TIME_WAIT state */
pcb = tcp_new();
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, TIME_WAIT, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
EXPECT_RET(pcb->state == TIME_WAIT);
/* Create max number pcbs */
for(i = 0;i < MEMP_NUM_TCP_PCB-1; i++) {
pcb_list[i] = tcp_new();
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == (i + 2));
}
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == MEMP_NUM_TCP_PCB);
/* Create one more pcb, and expect that the pcb in the TIME_WAIT state is deleted */
pcb_list[MEMP_NUM_TCP_PCB-1] = tcp_new();
EXPECT_RET(pcb_list[MEMP_NUM_TCP_PCB-1] != NULL);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == MEMP_NUM_TCP_PCB);
for (i = 0; i <= MEMP_NUM_TCP_PCB-1; i++)
{
tcp_abort(pcb_list[i]);
}
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/* Call tcp_connect to check active open */
START_TEST(test_tcp_connect_active_open)
{
struct test_tcp_counters counters;
struct tcp_pcb *pcb;
struct pbuf *p;
err_t err;
u16_t test_port = 1234;
u32_t seqno = 0;
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
/* Get seqno from SYN packet */
test_txcounters.copy_tx_packets = 1;
err = tcp_connect(pcb, &test_remote_ip, test_port, NULL);
test_txcounters.copy_tx_packets = 0;
EXPECT(err == ERR_OK);
EXPECT(pcb->state == SYN_SENT);
EXPECT(test_txcounters.num_tx_calls == 1);
EXPECT_RET(test_txcounters.tx_packets != NULL);
if (test_txcounters.tx_packets != NULL) {
struct tcp_hdr tcphdr;
u16_t ret;
ret = pbuf_copy_partial(test_txcounters.tx_packets, &tcphdr, 20, 20);
EXPECT(ret == 20);
EXPECT(TCPH_FLAGS(&tcphdr) & TCP_SYN);
pbuf_free(test_txcounters.tx_packets);
test_txcounters.tx_packets = NULL;
seqno = lwip_htonl(tcphdr.seqno);
EXPECT(seqno == pcb->lastack);
}
/* check correct syn packet */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, test_port,
pcb->local_port, NULL, 0, 12345, seqno + 1, TCP_SYN|TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT_RET(pcb->state == ESTABLISHED);
EXPECT_RET(test_txcounters.num_tx_calls == 2);
/* make sure the pcb is freed */
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
START_TEST(test_tcp_active_close)
{
struct tcp_pcb *pcb, *pcbl;
struct test_tcp_counters counters;
struct pbuf *p;
err_t err;
u32_t i;
LWIP_UNUSED_ARG(_i);
/* create TCP in LISTEN state */
memset(&counters, 0, sizeof(counters));
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
err = tcp_bind(pcb, &test_netif.ip_addr, 1234);
EXPECT_RET(err == ERR_OK);
pcbl = tcp_listen(pcb);
EXPECT_RET(pcbl != NULL);
EXPECT_RET(pcbl->state == LISTEN);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 1);
memset(&test_txcounters, 0, sizeof(test_txcounters));
err = tcp_close(pcbl);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 0);
EXPECT(test_txcounters.num_tx_calls == 0);
/* close TCP in SYN_SENT state */
memset(&counters, 0, sizeof(counters));
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
err = tcp_connect(pcb, &test_netif.gw, 1234, NULL);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(pcb->state == SYN_SENT);
EXPECT(test_txcounters.num_tx_calls == 1);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
memset(&test_txcounters, 0, sizeof(test_txcounters));
err = tcp_close(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
EXPECT(test_txcounters.num_tx_calls == 0);
/* close TCP in ESTABLISHED state */
memset(&counters, 0, sizeof(counters));
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, ESTABLISHED, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
memset(&test_txcounters, 0, sizeof(test_txcounters));
err = tcp_close(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(pcb->state == FIN_WAIT_1);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
/* test_tcp_tmr(); */
EXPECT(test_txcounters.num_tx_calls == 1);
/* create a segment ACK and pass it to tcp_input */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 1, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT_RET(pcb->state == FIN_WAIT_2);
/* create a segment FIN and pass it to tcp_input */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_FIN);
EXPECT_RET(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT_RET(pcb->state == TIME_WAIT);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
for (i = 0; i < 2 * TCP_MSL / TCP_TMR_INTERVAL + 1; i++) {
test_tcp_tmr();
}
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
START_TEST(test_tcp_imultaneous_close)
{
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data = 0x0f;
err_t err;
u32_t i;
LWIP_UNUSED_ARG(_i);
/* initialize counter struct */
memset(&counters, 0, sizeof(counters));
counters.expected_data_len = 1;
counters.expected_data = &data;
/* create and initialize the pcb */
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, ESTABLISHED, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
err = tcp_close(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(pcb->state == FIN_WAIT_1);
/* create a FIN segment */
p = tcp_create_rx_segment(pcb, &data, 0, 0, 0, TCP_FIN);
EXPECT(p != NULL);
if (p != NULL) {
test_tcp_input(p, &test_netif);
}
EXPECT_RET(pcb->state == CLOSING);
/* create an ACK segment */
p = tcp_create_rx_segment(pcb, &data, 0, 0, 1, TCP_ACK);
EXPECT(p != NULL);
if (p != NULL) {
test_tcp_input(p, &test_netif);
}
EXPECT_RET(pcb->state == TIME_WAIT);
for (i = 0; i < 2 * TCP_MSL / TCP_TMR_INTERVAL + 1; i++) {
test_tcp_tmr();
}
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/* RST was generated when receive any incoming segment in CLOSED state */
START_TEST(test_tcp_gen_rst_in_CLOSED)
{
struct pbuf *p;
ip_addr_t src_addr = test_remote_ip;
ip_addr_t dst_addr = test_local_ip;
LWIP_UNUSED_ARG(_i);
/* Do not create any pcb */
/* create a segment */
p = tcp_create_segment(&src_addr, &dst_addr, TEST_REMOTE_PORT,
TEST_LOCAL_PORT, NULL, 0, 12345, 54321, TCP_ACK);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
EXPECT(test_txcounters.num_tx_calls == 1);
}
END_TEST
/* RST was generated when receive ACK in LISTEN state */
START_TEST(test_tcp_gen_rst_in_LISTEN)
{
struct tcp_pcb_listen *lpcb;
struct pbuf *p;
ip_addr_t src_addr = test_remote_ip;
LWIP_UNUSED_ARG(_i);
/* create a pcb in LISTEN state */
lpcb = create_listening_pcb(TEST_LOCAL_PORT, NULL);
EXPECT_RET(lpcb != NULL);
/* create a segment */
p = tcp_create_segment(&src_addr,&lpcb->local_ip, TEST_REMOTE_PORT,
lpcb->local_port, NULL, 0, 12345, 54321, TCP_ACK);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
EXPECT(test_txcounters.num_tx_calls == 1);
/* the PCB still in LISTEN state */
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 1);
if (MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) != 0) {
/* can not use tcp_abort() */
tcp_close((struct tcp_pcb *)lpcb);
}
}
END_TEST
/* RST was generated when receive an SYN in TIME_WAIT state */
START_TEST(test_tcp_gen_rst_in_TIME_WAIT)
{
struct tcp_pcb *pcb;
struct pbuf *p;
LWIP_UNUSED_ARG(_i);
/* create a pcb in LISTEN state */
pcb = tcp_new();
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, TIME_WAIT, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
/* create a segment */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_SYN);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
EXPECT(test_txcounters.num_tx_calls == 1);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
EXPECT(pcb->state == TIME_WAIT);
}
END_TEST
/* receive TCP_RST with different seqno */
START_TEST(test_tcp_process_rst_seqno)
{
struct test_tcp_counters counters;
struct tcp_pcb *pcb;
struct pbuf *p;
err_t err;
LWIP_UNUSED_ARG(_i);
/* create and initialize a pcb in SYN_SENT state */
memset(&counters, 0, sizeof(counters));
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
err = tcp_connect(pcb, &test_remote_ip, TEST_REMOTE_PORT, NULL);
EXPECT_RET(err == ERR_OK);
/* a RST segment with incorrect seqno will not be accepted */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, TEST_REMOTE_PORT,
pcb->local_port, NULL, 0, 12345, pcb->snd_nxt-10, TCP_RST);
EXPECT(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT(counters.err_calls == 0);
/* a RST segment with correct seqno will be accepted */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, TEST_REMOTE_PORT,
pcb->local_port, NULL, 0, 12345, pcb->snd_nxt, TCP_RST);
EXPECT(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT(counters.err_calls == 1);
counters.err_calls = 0;
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
/* create another pcb in ESTABLISHED state */
memset(&counters, 0, sizeof(counters));
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, ESTABLISHED, &test_local_ip, &test_remote_ip, TEST_LOCAL_PORT, TEST_REMOTE_PORT);
/* a RST segment with incorrect seqno will not be accepted */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, pcb->remote_port,
pcb->local_port, NULL, 0, pcb->rcv_nxt-10, 54321, TCP_RST);
EXPECT(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT(counters.err_calls == 0);
/* a RST segment with correct seqno will be accepted */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, TEST_REMOTE_PORT,
pcb->local_port, NULL, 0, pcb->rcv_nxt, 54321, TCP_RST);
EXPECT(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT(counters.err_calls == 1);
counters.err_calls = 0;
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/* RST was generated when receive an SYN+ACK with incorrect ACK number in SYN_SENT state */
START_TEST(test_tcp_gen_rst_in_SYN_SENT_ackseq)
{
struct tcp_pcb *pcb;
struct pbuf *p;
u16_t test_port = 1234;
err_t err;
LWIP_UNUSED_ARG(_i);
/* create and initialize a pcb in listen state */
pcb = tcp_new();
EXPECT_RET(pcb != NULL);
err = tcp_connect(pcb, &test_remote_ip, test_port, NULL);
EXPECT_RET(err == ERR_OK);
/* create a SYN+ACK segment with incorrect seqno */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, pcb->remote_port,
pcb->local_port, NULL, 0, 12345, pcb->lastack-10, TCP_SYN|TCP_ACK);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
/* LWIP: send RST then re-send SYN immediately */
EXPECT(test_txcounters.num_tx_calls == 2);
}
END_TEST
/* RST was generated when receive an ACK without SYN in SYN_SENT state */
START_TEST(test_tcp_gen_rst_in_SYN_SENT_non_syn_ack)
{
struct tcp_pcb *pcb;
struct pbuf *p;
u16_t test_port = 1234;
err_t err;
LWIP_UNUSED_ARG(_i);
/* create and initialize a pcb in listen state */
pcb = tcp_new();
EXPECT_RET(pcb != NULL);
err = tcp_connect(pcb, &test_remote_ip, test_port, NULL);
EXPECT_RET(err == ERR_OK);
/* create a SYN+ACK segment with incorrect seqno */
p = tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, pcb->remote_port,
pcb->local_port, NULL, 0, 12345, pcb->lastack, TCP_ACK);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
/* LWIP: send RST then re-send SYN immediately */
EXPECT(test_txcounters.num_tx_calls == 2);
}
END_TEST
/* RST was generated when receive an ACK with incorrect seqno in SYN_RCVD state */
START_TEST(test_tcp_gen_rst_in_SYN_RCVD)
{
struct tcp_pcb_listen *lpcb;
struct pbuf *p;
u32_t ack_seqno = 0;
ip_addr_t src_addr = test_remote_ip;
LWIP_UNUSED_ARG(_i);
/* create and initialize a pcb in listen state */
lpcb = create_listening_pcb(TEST_LOCAL_PORT, NULL);
EXPECT_RET(lpcb != NULL);
/* LISTEN -> SYN_RCVD */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, TEST_REMOTE_PORT,
lpcb->local_port, NULL, 0, 1000, 54321, TCP_SYN);
EXPECT(p != NULL);
memset(&test_txcounters, 0, sizeof(struct test_tcp_txcounters));
test_tcp_input(p, &test_netif);
EXPECT(test_txcounters.num_tx_calls == 1);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
if (MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1) {
ack_seqno = tcp_active_pcbs[0].lastack;
}
/* create a ACK segment with incorrect seqno */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, TEST_REMOTE_PORT,
lpcb->local_port, NULL, 0, 1001, ack_seqno+1111, TCP_ACK);
EXPECT(p != NULL);
test_rst_generation_with_incoming_packet(p, &test_netif, &test_txcounters);
EXPECT(test_txcounters.num_tx_calls == 1);
/* the active pcb still exists */
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 1);
if (MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) != 0) {
/* can not use tcp_abort() */
tcp_close((struct tcp_pcb *)lpcb);
}
}
END_TEST
/* a listen pcb returns to LISTEN from SYN_RCVD when RST received */
START_TEST(test_tcp_receive_rst_SYN_RCVD_to_LISTEN)
{
struct tcp_pcb_listen *lpcb;
struct pbuf *p;
u16_t tcp_flags;
ip_addr_t src_addr = test_remote_ip;
LWIP_UNUSED_ARG(_i);
/* create and initialize a pcb in listen state */
lpcb = create_listening_pcb(TEST_LOCAL_PORT, NULL);
EXPECT_RET(lpcb != NULL);
/* create a SYN segment */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, TEST_REMOTE_PORT,
lpcb->local_port, NULL, 0, 1000, 54321, TCP_SYN);
EXPECT(p != NULL);
/* pass the segment to tcp_input */
memset(&test_txcounters, 0, sizeof(struct test_tcp_txcounters));
test_txcounters.copy_tx_packets = 1;
test_tcp_input(p, &test_netif);
test_txcounters.copy_tx_packets = 0;
/* check if packets are as expected */
EXPECT(test_txcounters.num_tx_calls == 1);
tcp_flags = get_tcp_flags_from_packet(test_txcounters.tx_packets, 20);
pbuf_free(test_txcounters.tx_packets);
test_txcounters.tx_packets = NULL;
EXPECT((tcp_flags & TCP_SYN) && (tcp_flags & TCP_ACK));
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
/* create a RST segment */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, TEST_REMOTE_PORT,
lpcb->local_port, NULL, 0, 1001, 54321, TCP_RST);
EXPECT(p != NULL);
test_tcp_input(p, &test_netif);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 1);
if (MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) != 0) {
/* can not use tcp_abort() */
tcp_close((struct tcp_pcb *)lpcb);
}
}
END_TEST
/** Create the suite including all tests for this module */
Suite *
tcp_state_suite(void)
{
testfunc tests[] = {
TESTFUNC(test_tcp_new_max_num),
TESTFUNC(test_tcp_new_max_num_remove_TIME_WAIT),
TESTFUNC(test_tcp_connect_active_open),
TESTFUNC(test_tcp_active_close),
TESTFUNC(test_tcp_imultaneous_close),
TESTFUNC(test_tcp_gen_rst_in_CLOSED),
TESTFUNC(test_tcp_gen_rst_in_LISTEN),
TESTFUNC(test_tcp_gen_rst_in_TIME_WAIT),
TESTFUNC(test_tcp_process_rst_seqno),
TESTFUNC(test_tcp_gen_rst_in_SYN_SENT_ackseq),
TESTFUNC(test_tcp_gen_rst_in_SYN_SENT_non_syn_ack),
TESTFUNC(test_tcp_gen_rst_in_SYN_RCVD),
TESTFUNC(test_tcp_receive_rst_SYN_RCVD_to_LISTEN),
};
return create_suite("TCP_STATE", tests, sizeof(tests) / sizeof(testfunc), tcp_state_setup, tcp_state_teardown);
}

8
test/unit/tcp/test_tcp_state.h Normal file
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#ifndef LWIP_HDR_TEST_TCP_STATE_H
#define LWIP_HDR_TEST_TCP_STATE_H
#include "../lwip_check.h"
Suite *tcp_state_suite(void);
#endif