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lwip/test/unit/tcp/test_tcp.c
Joel Cunningham 50a5d85f45 tcp: handle segmentation oversize during segment split (bug #52676) 
This fixes a bug in tcp_split_unsent_seg where oversized segments were not
handled during the split, leading to pcb->unsent_oversized and
useg->oversize_left getting out of sync with the split segment

This would result in over-writing the pbuf if another call to tcp_write()
happened after the split, but before the remainder of the split was sent in
tcp_output

Now pcb->unsent_oversized is explicitly cleared (because the remainder at
the tail is never oversized) and useg->oversized_left is cleared after it is
trimmed

This also updates the test_tcp_persist_split unit test to explicitly check for
this case
2017-12-18 11:42:13 -06:00

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#include "test_tcp.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
#if TCP_SND_BUF <= TCP_WND
#error "This tests needs TCP_SND_BUF to be > TCP_WND"
#endif
/* used with check_seqnos() */
#define SEQNO1 (0xFFFFFF00 - TCP_MSS)
#define ISS 6510
static u32_t seqnos[] = {
SEQNO1,
SEQNO1 + (1 * TCP_MSS),
SEQNO1 + (2 * TCP_MSS),
SEQNO1 + (3 * TCP_MSS),
SEQNO1 + (4 * TCP_MSS),
SEQNO1 + (5 * TCP_MSS) };
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();
}
}
/* Setups/teardown functions */
static struct netif *old_netif_list;
static struct netif *old_netif_default;
static void
tcp_setup(void)
{
old_netif_list = netif_list;
old_netif_default = netif_default;
netif_list = NULL;
netif_default = NULL;
/* reset iss to default (6510) */
tcp_ticks = 0;
tcp_ticks = 0 - (tcp_next_iss(NULL) - 6510);
tcp_next_iss(NULL);
tcp_ticks = 0;
test_tcp_timer = 0;
tcp_remove_all();
lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}
static void
tcp_teardown(void)
{
netif_list = NULL;
netif_default = NULL;
tcp_remove_all();
/* restore netif_list for next tests (e.g. loopif) */
netif_list = old_netif_list;
netif_default = old_netif_default;
lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}
/* Test functions */
/** Call tcp_new() and tcp_abort() and test memp stats */
START_TEST(test_tcp_new_abort)
{
struct tcp_pcb* pcb;
LWIP_UNUSED_ARG(_i);
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
pcb = tcp_new();
fail_unless(pcb != NULL);
if (pcb != NULL) {
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
}
END_TEST
/** Call tcp_new() and tcp_abort() and test memp stats */
START_TEST(test_tcp_listen_passive_open)
{
struct tcp_pcb *pcb, *pcbl;
struct tcp_pcb_listen *lpcb;
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct pbuf *p;
ip_addr_t src_addr;
err_t err;
LWIP_UNUSED_ARG(_i);
fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
/* initialize counter struct */
memset(&counters, 0, sizeof(counters));
pcb = tcp_new();
EXPECT_RET(pcb != NULL);
err = tcp_bind(pcb, &netif.ip_addr, 1234);
EXPECT(err == ERR_OK);
pcbl = tcp_listen(pcb);
EXPECT_RET(pcbl != NULL);
EXPECT_RET(pcbl != pcb);
lpcb = (struct tcp_pcb_listen *)pcbl;
ip_addr_set_ip4_u32_val(src_addr, lwip_htonl(lwip_ntohl(ip_addr_get_ip4_u32(&lpcb->local_ip)) + 1));
/* check correct syn packet */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, 12345,
lpcb->local_port, NULL, 0, 12345, 54321, TCP_SYN);
EXPECT(p != NULL);
if (p != NULL) {
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT(txcounters.num_tx_calls == 1);
}
/* check syn packet with short length */
p = tcp_create_segment(&src_addr, &lpcb->local_ip, 12345,
lpcb->local_port, NULL, 0, 12345, 54321, TCP_SYN);
EXPECT(p != NULL);
EXPECT(p->next == NULL);
if ((p != NULL) && (p->next == NULL)) {
p->len -= 2;
p->tot_len -= 2;
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT(txcounters.num_tx_calls == 1);
}
tcp_close(pcbl);
}
END_TEST
/** Create an ESTABLISHED pcb and check if receive callback is called */
START_TEST(test_tcp_recv_inseq)
{
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data[] = {1, 2, 3, 4};
u16_t data_len;
struct netif netif;
struct test_tcp_txcounters txcounters;
LWIP_UNUSED_ARG(_i);
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
data_len = sizeof(data);
/* initialize counter struct */
memset(&counters, 0, sizeof(counters));
counters.expected_data_len = data_len;
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);
/* create a segment */
p = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
EXPECT(p != NULL);
if (p != NULL) {
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT(counters.close_calls == 0);
EXPECT(counters.recv_calls == 1);
EXPECT(counters.recved_bytes == data_len);
EXPECT(counters.err_calls == 0);
}
/* 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
/** Create an ESTABLISHED pcb and check if receive callback is called if a segment
* overlapping rcv_nxt is received */
START_TEST(test_tcp_recv_inseq_trim)
{
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data[PBUF_POOL_BUFSIZE*2];
u16_t data_len;
struct netif netif;
struct test_tcp_txcounters txcounters;
const u32_t new_data_len = 40;
LWIP_UNUSED_ARG(_i);
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
data_len = sizeof(data);
memset(data, 0, sizeof(data));
/* initialize counter struct */
memset(&counters, 0, sizeof(counters));
counters.expected_data_len = data_len;
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);
/* create a segment (with an overlapping/old seqno so that the new data begins in the 2nd pbuf) */
p = tcp_create_rx_segment(pcb, counters.expected_data, data_len, (u32_t)(0-(data_len-new_data_len)), 0, 0);
EXPECT(p != NULL);
if (p != NULL) {
EXPECT(p->next != NULL);
if (p->next != NULL) {
EXPECT(p->next->next != NULL);
}
}
if ((p != NULL) && (p->next != NULL) && (p->next->next != NULL)) {
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT(counters.close_calls == 0);
EXPECT(counters.recv_calls == 1);
EXPECT(counters.recved_bytes == new_data_len);
EXPECT(counters.err_calls == 0);
}
/* 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
static err_t test_tcp_recv_expect1byte(void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err);
static err_t
test_tcp_recv_expectclose(void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
{
EXPECT_RETX(pcb != NULL, ERR_OK);
EXPECT_RETX(err == ERR_OK, ERR_OK);
LWIP_UNUSED_ARG(arg);
if (p != NULL) {
fail();
} else {
/* correct: FIN received; close our end, too */
err_t err2 = tcp_close(pcb);
fail_unless(err2 == ERR_OK);
/* set back to some other rx function, just to not get here again */
tcp_recv(pcb, test_tcp_recv_expect1byte);
}
return ERR_OK;
}
static err_t
test_tcp_recv_expect1byte(void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
{
EXPECT_RETX(pcb != NULL, ERR_OK);
EXPECT_RETX(err == ERR_OK, ERR_OK);
LWIP_UNUSED_ARG(arg);
if (p != NULL) {
if ((p->len == 1) && (p->tot_len == 1)) {
tcp_recv(pcb, test_tcp_recv_expectclose);
} else {
fail();
}
pbuf_free(p);
} else {
fail();
}
return ERR_OK;
}
START_TEST(test_tcp_passive_close)
{
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data = 0x0f;
struct netif netif;
struct test_tcp_txcounters txcounters;
LWIP_UNUSED_ARG(_i);
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
/* 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);
/* create a segment without data */
p = tcp_create_rx_segment(pcb, &data, 1, 0, 0, TCP_FIN);
EXPECT(p != NULL);
if (p != NULL) {
tcp_recv(pcb, test_tcp_recv_expect1byte);
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
}
/* don't free the pcb here (part of the test!) */
}
END_TEST
/** Check that we handle malformed tcp headers, and discard the pbuf(s) */
START_TEST(test_tcp_malformed_header)
{
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data[] = {1, 2, 3, 4};
u16_t data_len, chksum;
struct netif netif;
struct test_tcp_txcounters txcounters;
struct tcp_hdr *hdr;
LWIP_UNUSED_ARG(_i);
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
data_len = sizeof(data);
/* initialize counter struct */
memset(&counters, 0, sizeof(counters));
counters.expected_data_len = data_len;
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);
/* create a segment */
p = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
pbuf_header(p, -(s16_t)sizeof(struct ip_hdr));
hdr = (struct tcp_hdr *)p->payload;
TCPH_HDRLEN_FLAGS_SET(hdr, 15, 0x3d1);
hdr->chksum = 0;
chksum = ip_chksum_pseudo(p, IP_PROTO_TCP, p->tot_len,
&test_remote_ip, &test_local_ip);
hdr->chksum = chksum;
pbuf_header(p, sizeof(struct ip_hdr));
EXPECT(p != NULL);
EXPECT(p->next == NULL);
if (p != NULL) {
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT(counters.close_calls == 0);
EXPECT(counters.recv_calls == 0);
EXPECT(counters.recved_bytes == 0);
EXPECT(counters.err_calls == 0);
}
/* 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
/** Provoke fast retransmission by duplicate ACKs and then recover by ACKing all sent data.
* At the end, send more data. */
START_TEST(test_tcp_fast_retx_recover)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
char data1[] = { 1, 2, 3, 4};
char data2[] = { 5, 6, 7, 8};
char data3[] = { 9, 10, 11, 12};
char data4[] = {13, 14, 15, 16};
char data5[] = {17, 18, 19, 20};
char data6[TCP_MSS] = {21, 22, 23, 24};
err_t err;
LWIP_UNUSED_ARG(_i);
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* 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);
pcb->mss = TCP_MSS;
/* disable initial congestion window (we don't send a SYN here...) */
pcb->cwnd = pcb->snd_wnd;
/* send data1 */
err = tcp_write(pcb, data1, sizeof(data1), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(txcounters.num_tx_calls == 1);
EXPECT_RET(txcounters.num_tx_bytes == sizeof(data1) + sizeof(struct tcp_hdr) + sizeof(struct ip_hdr));
memset(&txcounters, 0, sizeof(txcounters));
/* "recv" ACK for data1 */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 4, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &netif);
EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(pcb->unacked == NULL);
/* send data2 */
err = tcp_write(pcb, data2, sizeof(data2), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT_RET(txcounters.num_tx_calls == 1);
EXPECT_RET(txcounters.num_tx_bytes == sizeof(data2) + sizeof(struct tcp_hdr) + sizeof(struct ip_hdr));
memset(&txcounters, 0, sizeof(txcounters));
/* duplicate ACK for data1 (data2 is lost) */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &netif);
EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(pcb->dupacks == 1);
/* send data3 */
err = tcp_write(pcb, data3, sizeof(data3), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* nagle enabled, no tx calls */
EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(txcounters.num_tx_bytes == 0);
memset(&txcounters, 0, sizeof(txcounters));
/* 2nd duplicate ACK for data1 (data2 and data3 are lost) */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &netif);
EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(pcb->dupacks == 2);
/* queue data4, don't send it (unsent-oversize is != 0) */
err = tcp_write(pcb, data4, sizeof(data4), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
/* 3nd duplicate ACK for data1 (data2 and data3 are lost) -> fast retransmission */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &netif);
/*EXPECT_RET(txcounters.num_tx_calls == 1);*/
EXPECT_RET(pcb->dupacks == 3);
memset(&txcounters, 0, sizeof(txcounters));
/* @todo: check expected data?*/
/* send data5, not output yet */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
/*err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);*/
EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(txcounters.num_tx_bytes == 0);
memset(&txcounters, 0, sizeof(txcounters));
{
int i = 0;
do
{
err = tcp_write(pcb, data6, TCP_MSS, TCP_WRITE_FLAG_COPY);
i++;
}while(err == ERR_OK);
EXPECT_RET(err != ERR_OK);
}
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/*EXPECT_RET(txcounters.num_tx_calls == 0);
EXPECT_RET(txcounters.num_tx_bytes == 0);*/
memset(&txcounters, 0, sizeof(txcounters));
/* send even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* ...and even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* ...and even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* ...and even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* send ACKs for data2 and data3 */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 12, TCP_ACK);
EXPECT_RET(p != NULL);
test_tcp_input(p, &netif);
/*EXPECT_RET(txcounters.num_tx_calls == 0);*/
/* ...and even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
/* ...and even more data */
err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
#if 0
/* create expected segment */
p1 = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
EXPECT_RET(p != NULL);
if (p != NULL) {
/* pass the segment to tcp_input */
test_tcp_input(p, &netif);
/* check if counters are as expected */
EXPECT_RET(counters.close_calls == 0);
EXPECT_RET(counters.recv_calls == 1);
EXPECT_RET(counters.recved_bytes == data_len);
EXPECT_RET(counters.err_calls == 0);
}
#endif
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
static u8_t tx_data[TCP_WND*2];
static void
check_seqnos(struct tcp_seg *segs, int num_expected, u32_t *seqnos_expected)
{
struct tcp_seg *s = segs;
int i;
for (i = 0; i < num_expected; i++, s = s->next) {
EXPECT_RET(s != NULL);
EXPECT(s->tcphdr->seqno == htonl(seqnos_expected[i]));
}
EXPECT(s == NULL);
}
/** Send data with sequence numbers that wrap around the u32_t range.
* Then, provoke fast retransmission by duplicate ACKs and check that all
* segment lists are still properly sorted. */
START_TEST(test_tcp_fast_rexmit_wraparound)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
err_t err;
size_t i;
u16_t sent_total = 0;
LWIP_UNUSED_ARG(_i);
for (i = 0; i < sizeof(tx_data); i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
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);
pcb->mss = TCP_MSS;
/* disable initial congestion window (we don't send a SYN here...) */
pcb->cwnd = 2*TCP_MSS;
/* start in congestion advoidance */
pcb->ssthresh = pcb->cwnd;
/* send 6 mss-sized segments */
for (i = 0; i < 6; i++) {
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
sent_total += TCP_MSS;
}
check_seqnos(pcb->unsent, 6, seqnos);
EXPECT(pcb->unacked == NULL);
err = tcp_output(pcb);
EXPECT(txcounters.num_tx_calls == 2);
EXPECT(txcounters.num_tx_bytes == 2 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
check_seqnos(pcb->unacked, 2, seqnos);
check_seqnos(pcb->unsent, 4, &seqnos[2]);
/* ACK the first segment */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, TCP_MSS, TCP_ACK);
test_tcp_input(p, &netif);
/* ensure this didn't trigger a retransmission. Only one
segment should be transmitted because cwnd opened up by
TCP_MSS and a fraction since we are in congestion avoidance */
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
check_seqnos(pcb->unacked, 2, &seqnos[1]);
check_seqnos(pcb->unsent, 3, &seqnos[3]);
/* 3 dupacks */
EXPECT(pcb->dupacks == 0);
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
test_tcp_input(p, &netif);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(pcb->dupacks == 1);
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
test_tcp_input(p, &netif);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(pcb->dupacks == 2);
/* 3rd dupack -> fast rexmit */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
test_tcp_input(p, &netif);
EXPECT(pcb->dupacks == 3);
EXPECT(txcounters.num_tx_calls == 4);
memset(&txcounters, 0, sizeof(txcounters));
EXPECT(pcb->unsent == NULL);
check_seqnos(pcb->unacked, 5, &seqnos[1]);
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/** Send data with sequence numbers that wrap around the u32_t range.
* Then, provoke RTO retransmission and check that all
* segment lists are still properly sorted. */
START_TEST(test_tcp_rto_rexmit_wraparound)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
err_t err;
size_t i;
u16_t sent_total = 0;
LWIP_UNUSED_ARG(_i);
for (i = 0; i < sizeof(tx_data); i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = 0;
tcp_ticks = 0 - tcp_next_iss(NULL);
tcp_ticks = SEQNO1 - tcp_next_iss(NULL);
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);
pcb->mss = TCP_MSS;
/* disable initial congestion window (we don't send a SYN here...) */
pcb->cwnd = 2*TCP_MSS;
/* send 6 mss-sized segments */
for (i = 0; i < 6; i++) {
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
sent_total += TCP_MSS;
}
check_seqnos(pcb->unsent, 6, seqnos);
EXPECT(pcb->unacked == NULL);
err = tcp_output(pcb);
EXPECT(txcounters.num_tx_calls == 2);
EXPECT(txcounters.num_tx_bytes == 2 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
check_seqnos(pcb->unacked, 2, seqnos);
check_seqnos(pcb->unsent, 4, &seqnos[2]);
/* call the tcp timer some times */
for (i = 0; i < 10; i++) {
test_tcp_tmr();
EXPECT(txcounters.num_tx_calls == 0);
}
/* 11th call to tcp_tmr: RTO rexmit fires */
test_tcp_tmr();
EXPECT(txcounters.num_tx_calls == 1);
check_seqnos(pcb->unacked, 1, seqnos);
check_seqnos(pcb->unsent, 5, &seqnos[1]);
/* fake greater cwnd */
pcb->cwnd = pcb->snd_wnd;
/* send more data */
err = tcp_output(pcb);
EXPECT(err == ERR_OK);
/* check queues are sorted */
EXPECT(pcb->unsent == NULL);
check_seqnos(pcb->unacked, 6, seqnos);
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/** Provoke fast retransmission by duplicate ACKs and then recover by ACKing all sent data.
* At the end, send more data. */
static void test_tcp_tx_full_window_lost(u8_t zero_window_probe_from_unsent)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf *p;
err_t err;
size_t i;
u16_t sent_total;
u8_t expected = 0xFE;
for (i = 0; i < sizeof(tx_data); i++) {
u8_t d = (u8_t)i;
if (d == 0xFE) {
d = 0xF0;
}
tx_data[i] = d;
}
if (zero_window_probe_from_unsent) {
tx_data[TCP_WND] = expected;
} else {
tx_data[0] = expected;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* 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);
pcb->mss = TCP_MSS;
/* disable initial congestion window (we don't send a SYN here...) */
pcb->cwnd = pcb->snd_wnd;
/* send a full window (minus 1 packets) of TCP data in MSS-sized chunks */
sent_total = 0;
if ((TCP_WND - TCP_MSS) % TCP_MSS != 0) {
u16_t initial_data_len = (TCP_WND - TCP_MSS) % TCP_MSS;
err = tcp_write(pcb, &tx_data[sent_total], initial_data_len, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == initial_data_len + 40U);
memset(&txcounters, 0, sizeof(txcounters));
sent_total += initial_data_len;
}
for (; sent_total < (TCP_WND - TCP_MSS); sent_total += TCP_MSS) {
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
}
EXPECT(sent_total == (TCP_WND - TCP_MSS));
/* now ACK the packet before the first */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
test_tcp_input(p, &netif);
/* ensure this didn't trigger a retransmission */
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
EXPECT(pcb->persist_backoff == 0);
/* send the last packet, now a complete window has been sent */
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
sent_total += TCP_MSS;
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
EXPECT(pcb->persist_backoff == 0);
if (zero_window_probe_from_unsent) {
/* ACK all data but close the TX window */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, TCP_WND, TCP_ACK, 0);
test_tcp_input(p, &netif);
/* ensure this didn't trigger any transmission */
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
/* window is completely full, but persist timer is off since send buffer is empty */
EXPECT(pcb->snd_wnd == 0);
EXPECT(pcb->persist_backoff == 0);
}
/* send one byte more (out of window) -> persist timer starts */
err = tcp_write(pcb, &tx_data[sent_total], 1, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
memset(&txcounters, 0, sizeof(txcounters));
if (!zero_window_probe_from_unsent) {
/* no persist timer unless a zero window announcement has been received */
EXPECT(pcb->persist_backoff == 0);
} else {
EXPECT(pcb->persist_backoff == 1);
/* call tcp_timer some more times to let persist timer count up */
for (i = 0; i < 4; i++) {
test_tcp_tmr();
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
}
/* this should trigger the zero-window-probe */
txcounters.copy_tx_packets = 1;
test_tcp_tmr();
txcounters.copy_tx_packets = 0;
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == 1 + 40U);
EXPECT(txcounters.tx_packets != NULL);
if (txcounters.tx_packets != NULL) {
u8_t sent;
u16_t ret;
ret = pbuf_copy_partial(txcounters.tx_packets, &sent, 1, 40U);
EXPECT(ret == 1);
EXPECT(sent == expected);
}
if (txcounters.tx_packets != NULL) {
pbuf_free(txcounters.tx_packets);
txcounters.tx_packets = NULL;
}
}
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
START_TEST(test_tcp_tx_full_window_lost_from_unsent)
{
LWIP_UNUSED_ARG(_i);
test_tcp_tx_full_window_lost(1);
}
END_TEST
START_TEST(test_tcp_tx_full_window_lost_from_unacked)
{
LWIP_UNUSED_ARG(_i);
test_tcp_tx_full_window_lost(0);
}
END_TEST
START_TEST(test_tcp_rto_tracking)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf* p;
err_t err;
size_t i;
u16_t sent_total = 0;
LWIP_UNUSED_ARG(_i);
for (i = 0; i < sizeof(tx_data); i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
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);
pcb->mss = TCP_MSS;
/* Set congestion window large enough to send all our segments */
pcb->cwnd = 5*TCP_MSS;
/* send 5 mss-sized segments */
for (i = 0; i < 5; i++) {
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
sent_total += TCP_MSS;
}
check_seqnos(pcb->unsent, 5, seqnos);
EXPECT(pcb->unacked == NULL);
err = tcp_output(pcb);
EXPECT(txcounters.num_tx_calls == 5);
EXPECT(txcounters.num_tx_bytes == 5 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
/* Check all 5 are in-flight */
EXPECT(pcb->unsent == NULL);
check_seqnos(pcb->unacked, 5, seqnos);
/* Force us into retransmisson timeout */
while (!(pcb->flags & TF_RTO)) {
test_tcp_tmr();
}
/* Ensure 4 remaining segments are back on unsent, ready for retransmission */
check_seqnos(pcb->unsent, 4, &seqnos[1]);
/* Ensure 1st segment is on unacked (already retransmitted) */
check_seqnos(pcb->unacked, 1, seqnos);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
/* Ensure rto_end points to next byte */
EXPECT(pcb->rto_end == seqnos[5]);
EXPECT(pcb->rto_end == pcb->snd_nxt);
/* Check cwnd was reset */
EXPECT(pcb->cwnd == pcb->mss);
/* Add another segment to send buffer which is outside of RTO */
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
sent_total += TCP_MSS;
check_seqnos(pcb->unsent, 5, &seqnos[1]);
/* Ensure no new data was sent */
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
EXPECT(pcb->rto_end == pcb->snd_nxt);
/* ACK first segment */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, TCP_MSS, TCP_ACK);
test_tcp_input(p, &netif);
/* Next two retranmissions should go out, due to cwnd in slow start */
EXPECT(txcounters.num_tx_calls == 2);
EXPECT(txcounters.num_tx_bytes == 2 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
check_seqnos(pcb->unacked, 2, &seqnos[1]);
check_seqnos(pcb->unsent, 3, &seqnos[3]);
/* RTO should still be marked */
EXPECT(pcb->flags & TF_RTO);
/* cwnd should have only grown by 1 MSS */
EXPECT(pcb->cwnd == (tcpwnd_size_t)(2 * pcb->mss));
/* Ensure no new data was sent */
EXPECT(pcb->rto_end == pcb->snd_nxt);
/* ACK the next two segments */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 2*TCP_MSS, TCP_ACK);
test_tcp_input(p, &netif);
/* Final 2 retransmissions and 1 new data should go out */
EXPECT(txcounters.num_tx_calls == 3);
EXPECT(txcounters.num_tx_bytes == 3 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
check_seqnos(pcb->unacked, 3, &seqnos[3]);
EXPECT(pcb->unsent == NULL);
/* RTO should still be marked */
EXPECT(pcb->flags & TF_RTO);
/* cwnd should have only grown by 1 MSS */
EXPECT(pcb->cwnd == (tcpwnd_size_t)(3 * pcb->mss));
/* snd_nxt should have been advanced past rto_end */
EXPECT(TCP_SEQ_GT(pcb->snd_nxt, pcb->rto_end));
/* ACK the next two segments, finishing our RTO, leaving new segment unacked */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 2*TCP_MSS, TCP_ACK);
test_tcp_input(p, &netif);
EXPECT(!(pcb->flags & TF_RTO));
check_seqnos(pcb->unacked, 1, &seqnos[5]);
/* We should be in ABC congestion avoidance, so no change in cwnd */
EXPECT(pcb->cwnd == (tcpwnd_size_t)(3 * pcb->mss));
EXPECT(pcb->cwnd >= pcb->ssthresh);
/* Ensure ABC congestion avoidance is tracking bytes acked */
EXPECT(pcb->bytes_acked == (tcpwnd_size_t)(2 * pcb->mss));
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
START_TEST(test_tcp_rto_timeout)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb *pcb, *cur;
err_t err;
size_t i;
LWIP_UNUSED_ARG(_i);
/* Setup data for a single segment */
for (i = 0; i < TCP_MSS; i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
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);
pcb->mss = TCP_MSS;
pcb->cwnd = TCP_MSS;
/* send our segment */
err = tcp_write(pcb, &tx_data[0], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == 1 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
/* ensure no errors have been recorded */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* Force us into retransmisson timeout */
while (!(pcb->flags & TF_RTO)) {
test_tcp_tmr();
}
/* check first rexmit */
EXPECT(pcb->nrtx == 1);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == 1 * (TCP_MSS + 40U));
/* still no error expected */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* keep running the timer till we hit our maximum RTO */
while (counters.last_err == ERR_OK) {
test_tcp_tmr();
}
/* check number of retransmissions */
EXPECT(txcounters.num_tx_calls == TCP_MAXRTX);
EXPECT(txcounters.num_tx_bytes == TCP_MAXRTX * (TCP_MSS + 40U));
/* check the connection (pcb) has been aborted */
EXPECT(counters.err_calls == 1);
EXPECT(counters.last_err == ERR_ABRT);
/* check our pcb is no longer active */
for (cur = tcp_active_pcbs; cur != NULL; cur = cur->next) {
EXPECT(cur != pcb);
}
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
START_TEST(test_tcp_zwp_timeout)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb *pcb, *cur;
struct pbuf* p;
err_t err;
size_t i;
LWIP_UNUSED_ARG(_i);
/* Setup data for two segments */
for (i = 0; i < 2*TCP_MSS; i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
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);
pcb->mss = TCP_MSS;
pcb->cwnd = TCP_MSS;
/* send first segment */
err = tcp_write(pcb, &tx_data[0], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT(err == ERR_OK);
err = tcp_output(pcb);
EXPECT(err == ERR_OK);
/* verify segment is in-flight */
EXPECT(pcb->unsent == NULL);
check_seqnos(pcb->unacked, 1, seqnos);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == 1 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
/* ACK the segment and close the TX window */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, TCP_MSS, TCP_ACK, 0);
test_tcp_input(p, &netif);
EXPECT(pcb->unacked == NULL);
EXPECT(pcb->unsent == NULL);
/* send buffer empty, persist should be off */
EXPECT(pcb->persist_backoff == 0);
EXPECT(pcb->snd_wnd == 0);
/* send second segment, should be buffered */
err = tcp_write(pcb, &tx_data[TCP_MSS], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT(err == ERR_OK);
err = tcp_output(pcb);
EXPECT(err == ERR_OK);
/* ensure it is buffered and persist timer started */
EXPECT(pcb->unacked == NULL);
check_seqnos(pcb->unsent, 1, &seqnos[1]);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
EXPECT(pcb->persist_backoff == 1);
/* ensure no errors have been recorded */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* run timer till first probe */
EXPECT(pcb->persist_probe == 0);
while (pcb->persist_probe == 0) {
test_tcp_tmr();
}
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == (1 + 40U));
memset(&txcounters, 0, sizeof(txcounters));
/* respond to probe with remote's current SEQ, ACK, and zero-window */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, 0, TCP_ACK, 0);
test_tcp_input(p, &netif);
/* ensure zero-window is still active, but probe count reset */
EXPECT(pcb->persist_backoff > 1);
EXPECT(pcb->persist_probe == 0);
EXPECT(pcb->snd_wnd == 0);
/* ensure no errors have been recorded */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* now run the timer till we hit our maximum probe count */
while (counters.last_err == ERR_OK) {
test_tcp_tmr();
}
/* check maximum number of 1 byte probes were sent */
EXPECT(txcounters.num_tx_calls == TCP_MAXRTX);
EXPECT(txcounters.num_tx_bytes == TCP_MAXRTX * (1 + 40U));
/* check the connection (pcb) has been aborted */
EXPECT(counters.err_calls == 1);
EXPECT(counters.last_err == ERR_ABRT);
/* check our pcb is no longer active */
for (cur = tcp_active_pcbs; cur != NULL; cur = cur->next) {
EXPECT(cur != pcb);
}
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
START_TEST(test_tcp_persist_split)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb *pcb;
struct pbuf* p;
err_t err;
size_t i;
LWIP_UNUSED_ARG(_i);
/* Setup data for four segments */
for (i = 0; i < 4 * TCP_MSS; i++) {
tx_data[i] = (u8_t)i;
}
/* initialize local vars */
test_tcp_init_netif(&netif, &txcounters, &test_local_ip, &test_netmask);
memset(&counters, 0, sizeof(counters));
/* create and initialize the pcb */
tcp_ticks = SEQNO1 - ISS;
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);
pcb->mss = TCP_MSS;
/* set window to three segments */
pcb->cwnd = 3 * TCP_MSS;
pcb->snd_wnd = 3 * TCP_MSS;
pcb->snd_wnd_max = 3 * TCP_MSS;
/* send four segments. Fourth should stay buffered and is a 3/4 MSS segment to
get coverage on the oversized segment case */
err = tcp_write(pcb, &tx_data[0], (3 * TCP_MSS) + (TCP_MSS - (TCP_MSS / 4)), TCP_WRITE_FLAG_COPY);
EXPECT(err == ERR_OK);
err = tcp_output(pcb);
EXPECT(err == ERR_OK);
/* verify 3 segments are in-flight */
EXPECT(pcb->unacked != NULL);
check_seqnos(pcb->unacked, 3, seqnos);
EXPECT(txcounters.num_tx_calls == 3);
EXPECT(txcounters.num_tx_bytes == 3 * (TCP_MSS + 40U));
memset(&txcounters, 0, sizeof(txcounters));
/* verify 4th segment is on unsent */
EXPECT(pcb->unsent != NULL);
EXPECT(pcb->unsent->len == TCP_MSS - (TCP_MSS / 4));
check_seqnos(pcb->unsent, 1, &seqnos[3]);
#if TCP_OVERSIZE
EXPECT(pcb->unsent_oversize == TCP_MSS / 4);
#if TCP_OVERSIZE_DBGCHECK
EXPECT(pcb->unsent->oversize_left == pcb->unsent_oversize);
#endif /* TCP_OVERSIZE_DBGCHECK */
#endif /* TCP_OVERSIZE */
/* ACK the 3 segments and update the window to only 1/2 TCP_MSS.
4th segment should stay on unsent because it's bigger than 1/2 MSS */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, 3 * TCP_MSS, TCP_ACK, TCP_MSS / 2);
test_tcp_input(p, &netif);
EXPECT(pcb->unacked == NULL);
EXPECT(pcb->snd_wnd == TCP_MSS / 2);
EXPECT(pcb->unsent != NULL);
check_seqnos(pcb->unsent, 1, &seqnos[3]);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
/* persist timer should be started since 4th segment is stuck waiting on snd_wnd */
EXPECT(pcb->persist_backoff == 1);
/* ensure no errors have been recorded */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* call tcp_timer some more times to let persist timer count up */
for (i = 0; i < 4; i++) {
test_tcp_tmr();
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
}
/* this should be the first timer shot, which should split the
* segment and send a runt (of the remaining window size) */
txcounters.copy_tx_packets = 1;
test_tcp_tmr();
txcounters.copy_tx_packets = 0;
/* persist will be disabled as RTO timer takes over */
EXPECT(pcb->persist_backoff == 0);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == ((TCP_MSS /2) + 40U));
/* verify 1/2 MSS segment sent, 1/4 MSS still buffered */
EXPECT(pcb->unsent != NULL);
EXPECT(pcb->unsent->len == TCP_MSS / 4);
EXPECT(pcb->unacked != NULL);
EXPECT(pcb->unacked->len == TCP_MSS / 2);
#if TCP_OVERSIZE
/* verify there is no oversized remaining since during the
segment split, the remainder pbuf is always the exact length */
EXPECT(pcb->unsent_oversize == 0);
#if TCP_OVERSIZE_DBGCHECK
/* Split segment already transmitted, should be at 0 */
EXPECT(pcb->unacked->oversize_left == 0);
/* Remainder segement should match pcb value (which is 0) */
EXPECT(pcb->unsent->oversize_left == pcb->unsent_oversize);
#endif /* TCP_OVERSIZE_DBGCHECK */
#endif /* TCP_OVERSIZE */
/* verify first half segment */
EXPECT(txcounters.tx_packets != NULL);
if (txcounters.tx_packets != NULL) {
u8_t sent[TCP_MSS / 2];
u16_t ret;
ret = pbuf_copy_partial(txcounters.tx_packets, &sent, TCP_MSS / 2, 40U);
EXPECT(ret == TCP_MSS / 2);
EXPECT(memcmp(sent, &tx_data[3 * TCP_MSS], TCP_MSS / 2) == 0);
}
if (txcounters.tx_packets != NULL) {
pbuf_free(txcounters.tx_packets);
txcounters.tx_packets = NULL;
}
memset(&txcounters, 0, sizeof(txcounters));
/* ACK the half segment, leave window at half segment */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, TCP_MSS / 2, TCP_ACK, TCP_MSS / 2);
txcounters.copy_tx_packets = 1;
test_tcp_input(p, &netif);
txcounters.copy_tx_packets = 0;
/* ensure remaining segment was sent */
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == ((TCP_MSS / 4) + 40U));
EXPECT(pcb->unsent == NULL);
EXPECT(pcb->unacked != NULL);
EXPECT(pcb->unacked->len == TCP_MSS / 4);
EXPECT(pcb->snd_wnd == TCP_MSS / 2);
/* verify remainder segment */
EXPECT(txcounters.tx_packets != NULL);
if (txcounters.tx_packets != NULL) {
u8_t sent[TCP_MSS / 4];
u16_t ret;
ret = pbuf_copy_partial(txcounters.tx_packets, &sent, TCP_MSS / 4, 40U);
EXPECT(ret == TCP_MSS / 4);
EXPECT(memcmp(sent, &tx_data[(3 * TCP_MSS) + TCP_MSS / 2], TCP_MSS / 4) == 0);
}
if (txcounters.tx_packets != NULL) {
pbuf_free(txcounters.tx_packets);
txcounters.tx_packets = NULL;
}
/* ensure no errors have been recorded */
EXPECT(counters.err_calls == 0);
EXPECT(counters.last_err == ERR_OK);
/* make sure the pcb is freed */
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
tcp_abort(pcb);
EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
}
END_TEST
/** Create the suite including all tests for this module */
Suite *
tcp_suite(void)
{
testfunc tests[] = {
TESTFUNC(test_tcp_new_abort),
TESTFUNC(test_tcp_listen_passive_open),
TESTFUNC(test_tcp_recv_inseq),
TESTFUNC(test_tcp_recv_inseq_trim),
TESTFUNC(test_tcp_passive_close),
TESTFUNC(test_tcp_malformed_header),
TESTFUNC(test_tcp_fast_retx_recover),
TESTFUNC(test_tcp_fast_rexmit_wraparound),
TESTFUNC(test_tcp_rto_rexmit_wraparound),
TESTFUNC(test_tcp_tx_full_window_lost_from_unacked),
TESTFUNC(test_tcp_tx_full_window_lost_from_unsent),
TESTFUNC(test_tcp_rto_tracking),
TESTFUNC(test_tcp_rto_timeout),
TESTFUNC(test_tcp_zwp_timeout),
TESTFUNC(test_tcp_persist_split)
};
return create_suite("TCP", tests, sizeof(tests)/sizeof(testfunc), tcp_setup, tcp_teardown);
}
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