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fixed bug #44023: TCP ssthresh value is unclear: ssthresh is set to the full send window for active open, too, and is updated once after SYN to ensure the correct send window is used

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sg 2015-08-30 20:47:17 +02:00
parent ddba4b90c3
commit b9a8310f4b
3 changed files with 17 additions and 5 deletions
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5
CHANGELOG
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@ -249,6 +249,11 @@ HISTORY
++ Bugfixes:
2015-08-28: Simon Goldschmidt
* tcp.c, tcp_in.c: fixed bug #44023: TCP ssthresh value is unclear: ssthresh
is set to the full send window for active open, too, and is updated once
after SYN to ensure the correct send window is used
2015-08-28: Simon Goldschmidt
* tcp: fixed bug #45559: Window scaling casts u32_t to u16_t without checks

2
src/core/tcp.c
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@ -834,7 +834,7 @@ tcp_connect(struct tcp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port,
pcb->mss = tcp_eff_send_mss(pcb->mss, &pcb->local_ip, &pcb->remote_ip, PCB_ISIPV6(pcb));
#endif /* TCP_CALCULATE_EFF_SEND_MSS */
pcb->cwnd = 1;
pcb->ssthresh = pcb->mss * 10;
pcb->ssthresh = TCP_WND;
#if LWIP_CALLBACK_API
pcb->connected = connected;
#else /* LWIP_CALLBACK_API */

15
src/core/tcp_in.c
View File

@ -61,7 +61,10 @@
#include "lwip/nd6.h"
#endif /* LWIP_ND6_TCP_REACHABILITY_HINTS */
/** Initial CWND calculation as defined RFC 2581 */
#define LWIP_TCP_CALC_INITIAL_CWND(mss) LWIP_MIN((4U * (mss)), LWIP_MAX((2U * (mss)), 4380U));
/** Initial slow start threshold value: we use the full window */
#define LWIP_TCP_INITIAL_SSTHRESH(pcb) ((pcb)->snd_wnd)
/* These variables are global to all functions involved in the input
processing of TCP segments. They are set by the tcp_input()
@ -592,7 +595,7 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
tcp_parseopt(npcb);
npcb->snd_wnd = SND_WND_SCALE(npcb, tcphdr->wnd);
npcb->snd_wnd_max = npcb->snd_wnd;
npcb->ssthresh = npcb->snd_wnd;
npcb->ssthresh = LWIP_TCP_INITIAL_SSTHRESH(npcb);
#if TCP_CALCULATE_EFF_SEND_MSS
npcb->mss = tcp_eff_send_mss(npcb->mss, &npcb->local_ip,
@ -741,9 +744,8 @@ tcp_process(struct tcp_pcb *pcb)
PCB_ISIPV6(pcb));
#endif /* TCP_CALCULATE_EFF_SEND_MSS */
/* Set ssthresh again after changing pcb->mss (already set in tcp_connect
* but for the default value of pcb->mss) */
pcb->ssthresh = pcb->mss * 10;
/* Set ssthresh again after changing 'mss' and 'snd_wnd' */
pcb->ssthresh = LWIP_TCP_INITIAL_SSTHRESH(pcb);
pcb->cwnd = LWIP_TCP_CALC_INITIAL_CWND(pcb->mss);
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_process (SENT): cwnd %"TCPWNDSIZE_F
@ -804,6 +806,11 @@ tcp_process(struct tcp_pcb *pcb)
* we'd better pass it on to the application as well. */
tcp_receive(pcb);
/* passive open: update initial ssthresh now that the correct window is
known: if the remote side supports window scaling, the window sent
with the initial SYN can be smaller than the one used later */
pcb->ssthresh = LWIP_TCP_INITIAL_SSTHRESH(pcb);
/* Prevent ACK for SYN to generate a sent event */
if (pcb->acked != 0) {
pcb->acked--;