743 lines
23 KiB
C
743 lines
23 KiB
C
#include "test_tcp.h"
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#include "lwip/priv/tcp_priv.h"
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#include "lwip/stats.h"
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#include "tcp_helper.h"
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#include "lwip/inet_chksum.h"
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#ifdef _MSC_VER
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#pragma warning(disable: 4307) /* we explicitly wrap around TCP seqnos */
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#endif
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#if !LWIP_STATS || !TCP_STATS || !MEMP_STATS
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#error "This tests needs TCP- and MEMP-statistics enabled"
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#endif
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#if TCP_SND_BUF <= TCP_WND
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#error "This tests needs TCP_SND_BUF to be > TCP_WND"
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#endif
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static u8_t test_tcp_timer;
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/* our own version of tcp_tmr so we can reset fast/slow timer state */
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static void
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test_tcp_tmr(void)
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{
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tcp_fasttmr();
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if (++test_tcp_timer & 1) {
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tcp_slowtmr();
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}
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}
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/* Setups/teardown functions */
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static void
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tcp_setup(void)
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{
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/* reset iss to default (6510) */
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tcp_ticks = 0;
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tcp_ticks = 0 - (tcp_next_iss() - 6510);
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tcp_next_iss();
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tcp_ticks = 0;
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test_tcp_timer = 0;
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tcp_remove_all();
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}
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static void
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tcp_teardown(void)
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{
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tcp_remove_all();
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netif_list = NULL;
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netif_default = NULL;
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}
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/* Test functions */
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/** Call tcp_new() and tcp_abort() and test memp stats */
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START_TEST(test_tcp_new_abort)
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{
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struct tcp_pcb* pcb;
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LWIP_UNUSED_ARG(_i);
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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pcb = tcp_new();
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fail_unless(pcb != NULL);
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if (pcb != NULL) {
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
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tcp_abort(pcb);
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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}
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}
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END_TEST
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/** Create an ESTABLISHED pcb and check if receive callback is called */
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START_TEST(test_tcp_recv_inseq)
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{
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struct test_tcp_counters counters;
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struct tcp_pcb* pcb;
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struct pbuf* p;
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char data[] = {1, 2, 3, 4};
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ip_addr_t remote_ip, local_ip, netmask;
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u16_t data_len;
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u16_t remote_port = 0x100, local_port = 0x101;
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struct netif netif;
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struct test_tcp_txcounters txcounters;
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LWIP_UNUSED_ARG(_i);
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/* initialize local vars */
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memset(&netif, 0, sizeof(netif));
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IP_ADDR4(&local_ip, 192, 168, 1, 1);
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IP_ADDR4(&remote_ip, 192, 168, 1, 2);
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IP_ADDR4(&netmask, 255, 255, 255, 0);
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test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
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data_len = sizeof(data);
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/* initialize counter struct */
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memset(&counters, 0, sizeof(counters));
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counters.expected_data_len = data_len;
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counters.expected_data = data;
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/* create and initialize the pcb */
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pcb = test_tcp_new_counters_pcb(&counters);
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EXPECT_RET(pcb != NULL);
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tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
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/* create a segment */
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p = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
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EXPECT(p != NULL);
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if (p != NULL) {
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/* pass the segment to tcp_input */
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test_tcp_input(p, &netif);
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/* check if counters are as expected */
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EXPECT(counters.close_calls == 0);
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EXPECT(counters.recv_calls == 1);
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EXPECT(counters.recved_bytes == data_len);
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EXPECT(counters.err_calls == 0);
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}
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/* make sure the pcb is freed */
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EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
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tcp_abort(pcb);
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EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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}
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END_TEST
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/** Check that we handle malformed tcp headers, and discard the pbuf(s) */
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START_TEST(test_tcp_malformed_header)
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{
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struct test_tcp_counters counters;
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struct tcp_pcb* pcb;
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struct pbuf* p;
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char data[] = {1, 2, 3, 4};
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ip_addr_t remote_ip, local_ip, netmask;
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u16_t data_len, chksum;
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u16_t remote_port = 0x100, local_port = 0x101;
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struct netif netif;
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struct test_tcp_txcounters txcounters;
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struct tcp_hdr *hdr;
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LWIP_UNUSED_ARG(_i);
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/* initialize local vars */
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memset(&netif, 0, sizeof(netif));
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IP_ADDR4(&local_ip, 192, 168, 1, 1);
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IP_ADDR4(&remote_ip, 192, 168, 1, 2);
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IP_ADDR4(&netmask, 255, 255, 255, 0);
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test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
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data_len = sizeof(data);
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/* initialize counter struct */
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memset(&counters, 0, sizeof(counters));
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counters.expected_data_len = data_len;
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counters.expected_data = data;
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/* create and initialize the pcb */
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pcb = test_tcp_new_counters_pcb(&counters);
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EXPECT_RET(pcb != NULL);
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tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
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/* create a segment */
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p = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
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pbuf_header(p, -(s16_t)sizeof(struct ip_hdr));
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hdr = (struct tcp_hdr *)p->payload;
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TCPH_HDRLEN_FLAGS_SET(hdr, 15, 0x3d1);
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hdr->chksum = 0;
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chksum = ip_chksum_pseudo(p, IP_PROTO_TCP, p->tot_len,
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&remote_ip, &local_ip);
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hdr->chksum = chksum;
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pbuf_header(p, sizeof(struct ip_hdr));
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EXPECT(p != NULL);
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EXPECT(p->next == NULL);
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if (p != NULL) {
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/* pass the segment to tcp_input */
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test_tcp_input(p, &netif);
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/* check if counters are as expected */
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EXPECT(counters.close_calls == 0);
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EXPECT(counters.recv_calls == 0);
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EXPECT(counters.recved_bytes == 0);
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EXPECT(counters.err_calls == 0);
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}
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/* make sure the pcb is freed */
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EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
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tcp_abort(pcb);
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EXPECT(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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}
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END_TEST
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/** Provoke fast retransmission by duplicate ACKs and then recover by ACKing all sent data.
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* At the end, send more data. */
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START_TEST(test_tcp_fast_retx_recover)
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{
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struct netif netif;
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struct test_tcp_txcounters txcounters;
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struct test_tcp_counters counters;
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struct tcp_pcb* pcb;
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struct pbuf* p;
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char data1[] = { 1, 2, 3, 4};
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char data2[] = { 5, 6, 7, 8};
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char data3[] = { 9, 10, 11, 12};
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char data4[] = {13, 14, 15, 16};
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char data5[] = {17, 18, 19, 20};
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char data6[TCP_MSS] = {21, 22, 23, 24};
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ip_addr_t remote_ip, local_ip, netmask;
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u16_t remote_port = 0x100, local_port = 0x101;
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err_t err;
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LWIP_UNUSED_ARG(_i);
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/* initialize local vars */
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IP_ADDR4(&local_ip, 192, 168, 1, 1);
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IP_ADDR4(&remote_ip, 192, 168, 1, 2);
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IP_ADDR4(&netmask, 255, 255, 255, 0);
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test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
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memset(&counters, 0, sizeof(counters));
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/* create and initialize the pcb */
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pcb = test_tcp_new_counters_pcb(&counters);
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EXPECT_RET(pcb != NULL);
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tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
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pcb->mss = TCP_MSS;
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/* disable initial congestion window (we don't send a SYN here...) */
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pcb->cwnd = pcb->snd_wnd;
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/* send data1 */
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err = tcp_write(pcb, data1, sizeof(data1), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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EXPECT_RET(txcounters.num_tx_calls == 1);
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EXPECT_RET(txcounters.num_tx_bytes == sizeof(data1) + sizeof(struct tcp_hdr) + sizeof(struct ip_hdr));
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memset(&txcounters, 0, sizeof(txcounters));
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/* "recv" ACK for data1 */
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p = tcp_create_rx_segment(pcb, NULL, 0, 0, 4, TCP_ACK);
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EXPECT_RET(p != NULL);
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test_tcp_input(p, &netif);
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EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(pcb->unacked == NULL);
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/* send data2 */
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err = tcp_write(pcb, data2, sizeof(data2), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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EXPECT_RET(txcounters.num_tx_calls == 1);
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EXPECT_RET(txcounters.num_tx_bytes == sizeof(data2) + sizeof(struct tcp_hdr) + sizeof(struct ip_hdr));
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memset(&txcounters, 0, sizeof(txcounters));
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/* duplicate ACK for data1 (data2 is lost) */
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p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
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EXPECT_RET(p != NULL);
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test_tcp_input(p, &netif);
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EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(pcb->dupacks == 1);
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/* send data3 */
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err = tcp_write(pcb, data3, sizeof(data3), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* nagle enabled, no tx calls */
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EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(txcounters.num_tx_bytes == 0);
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memset(&txcounters, 0, sizeof(txcounters));
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/* 2nd duplicate ACK for data1 (data2 and data3 are lost) */
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p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
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EXPECT_RET(p != NULL);
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test_tcp_input(p, &netif);
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EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(pcb->dupacks == 2);
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/* queue data4, don't send it (unsent-oversize is != 0) */
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err = tcp_write(pcb, data4, sizeof(data4), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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/* 3nd duplicate ACK for data1 (data2 and data3 are lost) -> fast retransmission */
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p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
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EXPECT_RET(p != NULL);
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test_tcp_input(p, &netif);
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/*EXPECT_RET(txcounters.num_tx_calls == 1);*/
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EXPECT_RET(pcb->dupacks == 3);
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memset(&txcounters, 0, sizeof(txcounters));
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/* @todo: check expected data?*/
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/* send data5, not output yet */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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/*err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);*/
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EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(txcounters.num_tx_bytes == 0);
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memset(&txcounters, 0, sizeof(txcounters));
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{
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int i = 0;
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do
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{
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err = tcp_write(pcb, data6, TCP_MSS, TCP_WRITE_FLAG_COPY);
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i++;
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}while(err == ERR_OK);
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EXPECT_RET(err != ERR_OK);
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}
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/*EXPECT_RET(txcounters.num_tx_calls == 0);
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EXPECT_RET(txcounters.num_tx_bytes == 0);*/
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memset(&txcounters, 0, sizeof(txcounters));
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/* send even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* ...and even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* ...and even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* ...and even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* send ACKs for data2 and data3 */
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p = tcp_create_rx_segment(pcb, NULL, 0, 0, 12, TCP_ACK);
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EXPECT_RET(p != NULL);
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test_tcp_input(p, &netif);
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/*EXPECT_RET(txcounters.num_tx_calls == 0);*/
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/* ...and even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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/* ...and even more data */
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err = tcp_write(pcb, data5, sizeof(data5), TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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err = tcp_output(pcb);
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EXPECT_RET(err == ERR_OK);
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#if 0
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/* create expected segment */
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p1 = tcp_create_rx_segment(pcb, counters.expected_data, data_len, 0, 0, 0);
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EXPECT_RET(p != NULL);
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if (p != NULL) {
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/* pass the segment to tcp_input */
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test_tcp_input(p, &netif);
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/* check if counters are as expected */
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EXPECT_RET(counters.close_calls == 0);
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EXPECT_RET(counters.recv_calls == 1);
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EXPECT_RET(counters.recved_bytes == data_len);
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EXPECT_RET(counters.err_calls == 0);
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}
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#endif
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/* make sure the pcb is freed */
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EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 1);
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tcp_abort(pcb);
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EXPECT_RET(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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}
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END_TEST
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static u8_t tx_data[TCP_WND*2];
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static void
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check_seqnos(struct tcp_seg *segs, int num_expected, u32_t *seqnos_expected)
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{
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struct tcp_seg *s = segs;
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int i;
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for (i = 0; i < num_expected; i++, s = s->next) {
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EXPECT_RET(s != NULL);
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EXPECT(s->tcphdr->seqno == htonl(seqnos_expected[i]));
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}
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EXPECT(s == NULL);
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}
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/** Send data with sequence numbers that wrap around the u32_t range.
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* Then, provoke fast retransmission by duplicate ACKs and check that all
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* segment lists are still properly sorted. */
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START_TEST(test_tcp_fast_rexmit_wraparound)
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{
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struct netif netif;
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struct test_tcp_txcounters txcounters;
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struct test_tcp_counters counters;
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struct tcp_pcb* pcb;
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struct pbuf* p;
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ip_addr_t remote_ip, local_ip, netmask;
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u16_t remote_port = 0x100, local_port = 0x101;
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err_t err;
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#define SEQNO1 (0xFFFFFF00 - TCP_MSS)
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#define ISS 6510
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u16_t i, sent_total = 0;
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u32_t seqnos[] = {
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SEQNO1,
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SEQNO1 + (1 * TCP_MSS),
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SEQNO1 + (2 * TCP_MSS),
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SEQNO1 + (3 * TCP_MSS),
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SEQNO1 + (4 * TCP_MSS),
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SEQNO1 + (5 * TCP_MSS)};
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LWIP_UNUSED_ARG(_i);
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for (i = 0; i < sizeof(tx_data); i++) {
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tx_data[i] = (u8_t)i;
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}
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/* initialize local vars */
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IP_ADDR4(&local_ip, 192, 168, 1, 1);
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IP_ADDR4(&remote_ip, 192, 168, 1, 2);
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IP_ADDR4(&netmask, 255, 255, 255, 0);
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test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
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memset(&counters, 0, sizeof(counters));
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/* create and initialize the pcb */
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tcp_ticks = SEQNO1 - ISS;
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pcb = test_tcp_new_counters_pcb(&counters);
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EXPECT_RET(pcb != NULL);
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EXPECT(pcb->lastack == SEQNO1);
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tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
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pcb->mss = TCP_MSS;
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/* disable initial congestion window (we don't send a SYN here...) */
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pcb->cwnd = 2*TCP_MSS;
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/* send 6 mss-sized segments */
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for (i = 0; i < 6; i++) {
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err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
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EXPECT_RET(err == ERR_OK);
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sent_total += TCP_MSS;
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}
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check_seqnos(pcb->unsent, 6, seqnos);
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EXPECT(pcb->unacked == NULL);
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err = tcp_output(pcb);
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EXPECT(txcounters.num_tx_calls == 2);
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EXPECT(txcounters.num_tx_bytes == 2 * (TCP_MSS + 40U));
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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 */
|
|
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;
|
|
ip_addr_t remote_ip, local_ip, netmask;
|
|
u16_t remote_port = 0x100, local_port = 0x101;
|
|
err_t err;
|
|
#define SEQNO1 (0xFFFFFF00 - TCP_MSS)
|
|
#define ISS 6510
|
|
u16_t i, sent_total = 0;
|
|
u32_t seqnos[] = {
|
|
SEQNO1,
|
|
SEQNO1 + (1 * TCP_MSS),
|
|
SEQNO1 + (2 * TCP_MSS),
|
|
SEQNO1 + (3 * TCP_MSS),
|
|
SEQNO1 + (4 * TCP_MSS),
|
|
SEQNO1 + (5 * TCP_MSS)};
|
|
LWIP_UNUSED_ARG(_i);
|
|
|
|
for (i = 0; i < sizeof(tx_data); i++) {
|
|
tx_data[i] = (u8_t)i;
|
|
}
|
|
|
|
/* initialize local vars */
|
|
IP_ADDR4(&local_ip, 192, 168, 1, 1);
|
|
IP_ADDR4(&remote_ip, 192, 168, 1, 2);
|
|
IP_ADDR4(&netmask, 255, 255, 255, 0);
|
|
test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
|
|
memset(&counters, 0, sizeof(counters));
|
|
|
|
/* create and initialize the pcb */
|
|
tcp_ticks = 0;
|
|
tcp_ticks = 0 - tcp_next_iss();
|
|
tcp_ticks = SEQNO1 - tcp_next_iss();
|
|
pcb = test_tcp_new_counters_pcb(&counters);
|
|
EXPECT_RET(pcb != NULL);
|
|
EXPECT(pcb->lastack == SEQNO1);
|
|
tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, 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;
|
|
ip_addr_t remote_ip, local_ip, netmask;
|
|
u16_t remote_port = 0x100, local_port = 0x101;
|
|
err_t err;
|
|
u16_t sent_total, i;
|
|
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 */
|
|
IP_ADDR4(&local_ip, 192, 168, 1, 1);
|
|
IP_ADDR4(&remote_ip, 192, 168, 1, 2);
|
|
IP_ADDR4(&netmask, 255, 255, 255, 0);
|
|
test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
|
|
memset(&counters, 0, sizeof(counters));
|
|
memset(&txcounters, 0, sizeof(txcounters));
|
|
|
|
/* create and initialize the pcb */
|
|
pcb = test_tcp_new_counters_pcb(&counters);
|
|
EXPECT_RET(pcb != NULL);
|
|
tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, 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);
|
|
EXPECT(pcb->persist_backoff == 1);
|
|
}
|
|
|
|
/* 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
|
|
|
|
/** Create the suite including all tests for this module */
|
|
Suite *
|
|
tcp_suite(void)
|
|
{
|
|
testfunc tests[] = {
|
|
TESTFUNC(test_tcp_new_abort),
|
|
TESTFUNC(test_tcp_recv_inseq),
|
|
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)
|
|
};
|
|
return create_suite("TCP", tests, sizeof(tests)/sizeof(testfunc), tcp_setup, tcp_teardown);
|
|
}
|