320 lines
9.8 KiB
C
320 lines
9.8 KiB
C
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#include "tcp_helper.h"
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#include "lwip/priv/tcp_priv.h"
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#include "lwip/stats.h"
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#include "lwip/pbuf.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/ip_addr.h"
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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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const ip_addr_t test_local_ip = IPADDR4_INIT_BYTES(192, 168, 1, 1);
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const ip_addr_t test_remote_ip = IPADDR4_INIT_BYTES(192, 168, 1, 2);
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const ip_addr_t test_netmask = IPADDR4_INIT_BYTES(255, 255, 255, 0);
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/** Remove all pcbs on the given list. */
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static void
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tcp_remove(struct tcp_pcb* pcb_list)
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{
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struct tcp_pcb *pcb = pcb_list;
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struct tcp_pcb *pcb2;
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while(pcb != NULL) {
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pcb2 = pcb;
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pcb = pcb->next;
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tcp_abort(pcb2);
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}
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}
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/** Remove all pcbs on listen-, active- and time-wait-list (bound- isn't exported). */
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void
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tcp_remove_all(void)
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{
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tcp_remove(tcp_listen_pcbs.pcbs);
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tcp_remove(tcp_bound_pcbs);
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tcp_remove(tcp_active_pcbs);
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tcp_remove(tcp_tw_pcbs);
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB) == 0);
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_PCB_LISTEN) == 0);
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fail_unless(MEMP_STATS_GET(used, MEMP_TCP_SEG) == 0);
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fail_unless(MEMP_STATS_GET(used, MEMP_PBUF_POOL) == 0);
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}
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/** Create a TCP segment usable for passing to tcp_input */
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static struct pbuf*
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tcp_create_segment_wnd(ip_addr_t* src_ip, ip_addr_t* dst_ip,
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u16_t src_port, u16_t dst_port, void* data, size_t data_len,
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u32_t seqno, u32_t ackno, u8_t headerflags, u16_t wnd)
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{
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struct pbuf *p, *q;
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struct ip_hdr* iphdr;
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struct tcp_hdr* tcphdr;
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u16_t pbuf_len = (u16_t)(sizeof(struct ip_hdr) + sizeof(struct tcp_hdr) + data_len);
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LWIP_ASSERT("data_len too big", data_len <= 0xFFFF);
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p = pbuf_alloc(PBUF_RAW, pbuf_len, PBUF_POOL);
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EXPECT_RETNULL(p != NULL);
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/* first pbuf must be big enough to hold the headers */
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EXPECT_RETNULL(p->len >= (sizeof(struct ip_hdr) + sizeof(struct tcp_hdr)));
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if (data_len > 0) {
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/* first pbuf must be big enough to hold at least 1 data byte, too */
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EXPECT_RETNULL(p->len > (sizeof(struct ip_hdr) + sizeof(struct tcp_hdr)));
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}
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for(q = p; q != NULL; q = q->next) {
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memset(q->payload, 0, q->len);
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}
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iphdr = (struct ip_hdr*)p->payload;
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/* fill IP header */
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iphdr->dest.addr = ip_2_ip4(dst_ip)->addr;
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iphdr->src.addr = ip_2_ip4(src_ip)->addr;
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IPH_VHL_SET(iphdr, 4, IP_HLEN / 4);
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IPH_TOS_SET(iphdr, 0);
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IPH_LEN_SET(iphdr, htons(p->tot_len));
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IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
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/* let p point to TCP header */
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pbuf_header(p, -(s16_t)sizeof(struct ip_hdr));
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tcphdr = (struct tcp_hdr*)p->payload;
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tcphdr->src = htons(src_port);
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tcphdr->dest = htons(dst_port);
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tcphdr->seqno = htonl(seqno);
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tcphdr->ackno = htonl(ackno);
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TCPH_HDRLEN_SET(tcphdr, sizeof(struct tcp_hdr)/4);
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TCPH_FLAGS_SET(tcphdr, headerflags);
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tcphdr->wnd = htons(wnd);
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if (data_len > 0) {
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/* let p point to TCP data */
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pbuf_header(p, -(s16_t)sizeof(struct tcp_hdr));
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/* copy data */
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pbuf_take(p, data, (u16_t)data_len);
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/* let p point to TCP header again */
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pbuf_header(p, sizeof(struct tcp_hdr));
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}
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/* calculate checksum */
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tcphdr->chksum = ip_chksum_pseudo(p,
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IP_PROTO_TCP, p->tot_len, src_ip, dst_ip);
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pbuf_header(p, sizeof(struct ip_hdr));
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return p;
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}
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/** Create a TCP segment usable for passing to tcp_input */
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struct pbuf*
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tcp_create_segment(ip_addr_t* src_ip, ip_addr_t* dst_ip,
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u16_t src_port, u16_t dst_port, void* data, size_t data_len,
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u32_t seqno, u32_t ackno, u8_t headerflags)
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{
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return tcp_create_segment_wnd(src_ip, dst_ip, src_port, dst_port, data,
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data_len, seqno, ackno, headerflags, TCP_WND);
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}
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/** Create a TCP segment usable for passing to tcp_input
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* - IP-addresses, ports, seqno and ackno are taken from pcb
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* - seqno and ackno can be altered with an offset
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*/
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struct pbuf*
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tcp_create_rx_segment(struct tcp_pcb* pcb, void* data, size_t data_len, u32_t seqno_offset,
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u32_t ackno_offset, u8_t headerflags)
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{
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return tcp_create_segment(&pcb->remote_ip, &pcb->local_ip, pcb->remote_port, pcb->local_port,
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data, data_len, pcb->rcv_nxt + seqno_offset, pcb->lastack + ackno_offset, headerflags);
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}
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/** Create a TCP segment usable for passing to tcp_input
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* - IP-addresses, ports, seqno and ackno are taken from pcb
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* - seqno and ackno can be altered with an offset
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* - TCP window can be adjusted
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*/
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struct pbuf* tcp_create_rx_segment_wnd(struct tcp_pcb* pcb, void* data, size_t data_len,
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u32_t seqno_offset, u32_t ackno_offset, u8_t headerflags, u16_t wnd)
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{
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return tcp_create_segment_wnd(&pcb->remote_ip, &pcb->local_ip, pcb->remote_port, pcb->local_port,
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data, data_len, pcb->rcv_nxt + seqno_offset, pcb->lastack + ackno_offset, headerflags, wnd);
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}
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/** Safely bring a tcp_pcb into the requested state */
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void
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tcp_set_state(struct tcp_pcb* pcb, enum tcp_state state, const ip_addr_t* local_ip,
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const ip_addr_t* remote_ip, u16_t local_port, u16_t remote_port)
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{
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u32_t iss;
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/* @todo: are these all states? */
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/* @todo: remove from previous list */
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pcb->state = state;
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iss = tcp_next_iss(pcb);
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pcb->snd_wl2 = iss;
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pcb->snd_nxt = iss;
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pcb->lastack = iss;
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pcb->snd_lbb = iss;
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if (state == ESTABLISHED) {
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TCP_REG(&tcp_active_pcbs, pcb);
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ip_addr_copy(pcb->local_ip, *local_ip);
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pcb->local_port = local_port;
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ip_addr_copy(pcb->remote_ip, *remote_ip);
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pcb->remote_port = remote_port;
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} else if(state == LISTEN) {
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TCP_REG(&tcp_listen_pcbs.pcbs, pcb);
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ip_addr_copy(pcb->local_ip, *local_ip);
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pcb->local_port = local_port;
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} else if(state == TIME_WAIT) {
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TCP_REG(&tcp_tw_pcbs, pcb);
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ip_addr_copy(pcb->local_ip, *local_ip);
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pcb->local_port = local_port;
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ip_addr_copy(pcb->remote_ip, *remote_ip);
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pcb->remote_port = remote_port;
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} else {
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fail();
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}
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}
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void
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test_tcp_counters_err(void* arg, err_t err)
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{
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struct test_tcp_counters* counters = (struct test_tcp_counters*)arg;
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EXPECT_RET(arg != NULL);
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counters->err_calls++;
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counters->last_err = err;
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}
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static void
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test_tcp_counters_check_rxdata(struct test_tcp_counters* counters, struct pbuf* p)
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{
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struct pbuf* q;
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u32_t i, received;
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if(counters->expected_data == NULL) {
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/* no data to compare */
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return;
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}
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EXPECT_RET(counters->recved_bytes + p->tot_len <= counters->expected_data_len);
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received = counters->recved_bytes;
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for(q = p; q != NULL; q = q->next) {
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char *data = (char*)q->payload;
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for(i = 0; i < q->len; i++) {
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EXPECT_RET(data[i] == counters->expected_data[received]);
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received++;
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}
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}
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EXPECT(received == counters->recved_bytes + p->tot_len);
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}
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err_t
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test_tcp_counters_recv(void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
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{
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struct test_tcp_counters* counters = (struct test_tcp_counters*)arg;
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EXPECT_RETX(arg != NULL, ERR_OK);
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EXPECT_RETX(pcb != NULL, ERR_OK);
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EXPECT_RETX(err == ERR_OK, ERR_OK);
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if (p != NULL) {
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if (counters->close_calls == 0) {
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counters->recv_calls++;
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test_tcp_counters_check_rxdata(counters, p);
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counters->recved_bytes += p->tot_len;
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} else {
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counters->recv_calls_after_close++;
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counters->recved_bytes_after_close += p->tot_len;
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}
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pbuf_free(p);
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} else {
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counters->close_calls++;
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}
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EXPECT(counters->recv_calls_after_close == 0 && counters->recved_bytes_after_close == 0);
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return ERR_OK;
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}
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/** Allocate a pcb and set up the test_tcp_counters_* callbacks */
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struct tcp_pcb*
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test_tcp_new_counters_pcb(struct test_tcp_counters* counters)
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{
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struct tcp_pcb* pcb = tcp_new();
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if (pcb != NULL) {
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/* set up args and callbacks */
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tcp_arg(pcb, counters);
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tcp_recv(pcb, test_tcp_counters_recv);
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tcp_err(pcb, test_tcp_counters_err);
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pcb->snd_wnd = TCP_WND;
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pcb->snd_wnd_max = TCP_WND;
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}
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return pcb;
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}
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/** Calls tcp_input() after adjusting current_iphdr_dest */
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void test_tcp_input(struct pbuf *p, struct netif *inp)
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{
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struct ip_hdr *iphdr = (struct ip_hdr*)p->payload;
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/* these lines are a hack, don't use them as an example :-) */
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ip_addr_copy_from_ip4(*ip_current_dest_addr(), iphdr->dest);
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ip_addr_copy_from_ip4(*ip_current_src_addr(), iphdr->src);
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ip_current_netif() = inp;
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ip_data.current_ip4_header = iphdr;
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/* since adding IPv6, p->payload must point to tcp header, not ip header */
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pbuf_header(p, -(s16_t)sizeof(struct ip_hdr));
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tcp_input(p, inp);
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ip_addr_set_zero(ip_current_dest_addr());
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ip_addr_set_zero(ip_current_src_addr());
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ip_current_netif() = NULL;
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ip_data.current_ip4_header = NULL;
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}
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static err_t test_tcp_netif_output(struct netif *netif, struct pbuf *p,
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const ip4_addr_t *ipaddr)
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{
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struct test_tcp_txcounters *txcounters = (struct test_tcp_txcounters*)netif->state;
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LWIP_UNUSED_ARG(ipaddr);
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if (txcounters != NULL)
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{
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txcounters->num_tx_calls++;
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txcounters->num_tx_bytes += p->tot_len;
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if (txcounters->copy_tx_packets) {
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struct pbuf *p_copy = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
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err_t err;
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EXPECT(p_copy != NULL);
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err = pbuf_copy(p_copy, p);
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EXPECT(err == ERR_OK);
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if (txcounters->tx_packets == NULL) {
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txcounters->tx_packets = p_copy;
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} else {
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pbuf_cat(txcounters->tx_packets, p_copy);
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}
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}
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}
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return ERR_OK;
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}
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void test_tcp_init_netif(struct netif *netif, struct test_tcp_txcounters *txcounters,
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const ip_addr_t *ip_addr, const ip_addr_t *netmask)
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{
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struct netif *n;
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memset(netif, 0, sizeof(struct netif));
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if (txcounters != NULL) {
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memset(txcounters, 0, sizeof(struct test_tcp_txcounters));
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netif->state = txcounters;
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}
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netif->output = test_tcp_netif_output;
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netif->flags |= NETIF_FLAG_UP | NETIF_FLAG_LINK_UP;
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ip_addr_copy_from_ip4(netif->netmask, *ip_2_ip4(netmask));
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ip_addr_copy_from_ip4(netif->ip_addr, *ip_2_ip4(ip_addr));
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for (n = netif_list; n != NULL; n = n->next) {
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if (n == netif) {
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return;
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}
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}
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netif->next = NULL;
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netif_list = netif;
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}
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