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Major bugfix, found by Raimondas Sasnauskas: the TCP periodic timer was not started when a new connection request arrived. If there were no other active TCP connections, this means that the SYNACK would never be retransmitted, potentially leading to a forever stale TCP connection.

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This commit is contained in:
adamdunkels 2010-02-09 12:58:53 +00:00
parent a6c6522548
commit d67d1f7340
1 changed files with 32 additions and 19 deletions
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49
core/net/tcpip.c
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@ -29,7 +29,7 @@
* This file is part of the Contiki operating system.
*
*
* $Id: tcpip.c,v 1.23 2010/02/05 12:43:36 nifi Exp $
* $Id: tcpip.c,v 1.24 2010/02/09 12:58:53 adamdunkels Exp $
*/
/**
* \file
@ -71,6 +71,7 @@ void uip_log(char *msg);
#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[UIP_LLIPH_LEN + uip_ext_len])
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_TCP_BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
process_event_t tcpip_event;
#if UIP_CONF_ICMP6
@ -156,6 +157,29 @@ unsigned char tcpip_is_forwarding; /* Forwarding right now? */
PROCESS(tcpip_process, "TCP/IP stack");
/*---------------------------------------------------------------------------*/
static void
start_periodic_tcp_timer(void)
{
if(etimer_expired(&periodic)) {
etimer_restart(&periodic);
}
}
/*---------------------------------------------------------------------------*/
static void
check_for_tcp_syn(void)
{
/* This is a hack that is needed to start the periodic TCP timer if
an incoming packet contains a SYN: since uIP does not inform the
application if a SYN arrives, we have no other way of starting
this timer. This function is called for every incoming IP packet
to check for such SYNs. */
#define TCP_SYN 0x02
if(UIP_IP_BUF->proto == UIP_PROTO_TCP &&
(UIP_TCP_BUF->flags & TCP_SYN) == TCP_SYN) {
start_periodic_tcp_timer();
}
}
/*---------------------------------------------------------------------------*/
static void
packet_input(void)
@ -165,6 +189,7 @@ packet_input(void)
tcpip_is_forwarding = 1;
if(uip_fw_forward() == UIP_FW_LOCAL) {
tcpip_is_forwarding = 0;
check_for_tcp_syn();
uip_input();
if(uip_len > 0) {
#if UIP_CONF_TCP_SPLIT
@ -183,6 +208,7 @@ packet_input(void)
}
#else /* UIP_CONF_IP_FORWARD */
if(uip_len > 0) {
check_for_tcp_syn();
uip_input();
if(uip_len > 0) {
#if UIP_CONF_TCP_SPLIT
@ -199,12 +225,8 @@ packet_input(void)
}
#endif /* UIP_CONF_IP_FORWARD */
}
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
#if UIP_TCP
#if UIP_ACTIVE_OPEN
struct uip_conn *
tcp_connect(uip_ipaddr_t *ripaddr, u16_t port, void *appstate)
@ -273,10 +295,7 @@ tcp_attach(struct uip_conn *conn,
}
#endif /* UIP_TCP */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
#if UIP_UDP
void
udp_attach(struct uip_udp_conn *conn,
@ -349,7 +368,6 @@ tcpip_icmp6_call(u8_t type)
}
#endif /* UIP_CONF_ICMP6 */
/*---------------------------------------------------------------------------*/
static void
eventhandler(process_event_t ev, process_data_t data)
{
@ -483,17 +501,14 @@ eventhandler(process_event_t ev, process_data_t data)
uip_poll_conn(data);
#if UIP_CONF_IPV6
tcpip_ipv6_output();
#else
#else /* UIP_CONF_IPV6 */
if(uip_len > 0) {
PRINTF("tcpip_output from tcp poll len %d\n", uip_len);
tcpip_output();
}
#endif /* UIP_CONF_IPV6 */
/* Start the periodic polling, if it isn't already active. */
if(etimer_expired(&periodic)) {
etimer_restart(&periodic);
}
start_periodic_tcp_timer();
}
break;
#endif /* UIP_TCP */
@ -720,12 +735,10 @@ tcpip_uipcall(void)
}
/* Start the periodic polling, if it isn't already active. */
if(etimer_expired(&periodic)) {
etimer_restart(&periodic);
start_periodic_tcp_timer();
}
}
}
#endif
#endif /* UIP_TCP */
if(ts->p != NULL) {
process_post_synch(ts->p, tcpip_event, ts->state);