lwip/test/unit/tcp/tcp_helper.c

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