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fixed bug #48543 (TCP sent callback may prematurely report sent data when only part of a segment is acked) and don't include SYN/FIN in snd_buf counter (patch by Ambroz Bizjak)

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This commit is contained in:
goldsimon 2016-07-21 13:47:52 +02:00
parent d43c092f17
commit 523b11e664
3 changed files with 8 additions and 27 deletions
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5
CHANGELOG
View File

@ -321,6 +321,11 @@ HISTORY
++ Bugfixes:
2016-07-21: Simon Goldschmidt (patch by Ambroz Bizjak)
* tcp_in.c, tcp_out.c: fixed bug #48543 (TCP sent callback may prematurely
report sent data when only part of a segment is acked) and don't include
SYN/FIN in snd_buf counter
2016-07-19: Simon Goldschmidt
* etharp.c: fixed bug #48477 (ARP input packet might update static entry)

19
src/core/tcp_in.c
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@ -752,7 +752,6 @@ tcp_process(struct tcp_pcb *pcb)
/* received SYN ACK with expected sequence number? */
if ((flags & TCP_ACK) && (flags & TCP_SYN)
&& (ackno == pcb->lastack + 1)) {
pcb->snd_buf++;
pcb->rcv_nxt = seqno + 1;
pcb->rcv_ann_right_edge = pcb->rcv_nxt;
pcb->lastack = ackno;
@ -1070,7 +1069,6 @@ tcp_receive(struct tcp_pcb *pcb)
/* Clause 1 */
if (TCP_SEQ_LEQ(ackno, pcb->lastack)) {
recv_acked = 0;
/* Clause 2 */
if (tcplen == 0) {
/* Clause 3 */
@ -1119,12 +1117,6 @@ tcp_receive(struct tcp_pcb *pcb)
/* Reset the retransmission time-out. */
pcb->rto = (pcb->sa >> 3) + pcb->sv;
/* Update the send buffer space. Diff between the two can never exceed 64K
unless window scaling is used. */
recv_acked = (tcpwnd_size_t)(ackno - pcb->lastack);
pcb->snd_buf += recv_acked;
/* Reset the fast retransmit variables. */
pcb->dupacks = 0;
pcb->lastack = ackno;
@ -1167,12 +1159,9 @@ tcp_receive(struct tcp_pcb *pcb)
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"TCPWNDSIZE_F" ... ", (tcpwnd_size_t)pcb->snd_queuelen));
LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
/* Prevent ACK for FIN to generate a sent event */
if ((recv_acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
recv_acked--;
}
pcb->snd_queuelen -= pbuf_clen(next->p);
recv_acked += next->len;
tcp_seg_free(next);
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"TCPWNDSIZE_F" (after freeing unacked)\n", (tcpwnd_size_t)pcb->snd_queuelen));
@ -1200,7 +1189,6 @@ tcp_receive(struct tcp_pcb *pcb)
#endif /* LWIP_IPV6 && LWIP_ND6_TCP_REACHABILITY_HINTS*/
} else {
/* Out of sequence ACK, didn't really ack anything */
recv_acked = 0;
tcp_send_empty_ack(pcb);
}
@ -1227,10 +1215,8 @@ tcp_receive(struct tcp_pcb *pcb)
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"TCPWNDSIZE_F" ... ", (tcpwnd_size_t)pcb->snd_queuelen));
LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
/* Prevent ACK for FIN to generate a sent event */
if ((recv_acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
recv_acked--;
}
pcb->snd_queuelen -= pbuf_clen(next->p);
recv_acked += next->len;
tcp_seg_free(next);
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"TCPWNDSIZE_F" (after freeing unsent)\n", (tcpwnd_size_t)pcb->snd_queuelen));
if (pcb->snd_queuelen != 0) {
@ -1238,6 +1224,7 @@ tcp_receive(struct tcp_pcb *pcb)
pcb->unacked != NULL || pcb->unsent != NULL);
}
}
pcb->snd_buf += recv_acked;
/* End of ACK for new data processing. */
LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: pcb->rttest %"U32_F" rtseq %"U32_F" ackno %"U32_F"\n",

11
src/core/tcp_out.c
View File

@ -788,16 +788,6 @@ tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags)
#endif /* LWIP_TCP_TIMESTAMPS */
optlen = LWIP_TCP_OPT_LENGTH(optflags);
/* tcp_enqueue_flags is always called with either SYN or FIN in flags.
* We need one available snd_buf byte to do that.
* This means we can't send FIN while snd_buf==0. A better fix would be to
* not include SYN and FIN sequence numbers in the snd_buf count. */
if (pcb->snd_buf == 0) {
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("tcp_enqueue_flags: no send buffer available\n"));
TCP_STATS_INC(tcp.memerr);
return ERR_MEM;
}
/* Allocate pbuf with room for TCP header + options */
if ((p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
pcb->flags |= TF_NAGLEMEMERR;
@ -839,7 +829,6 @@ tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags)
if ((flags & TCP_SYN) || (flags & TCP_FIN)) {
pcb->snd_lbb++;
/* optlen does not influence snd_buf */
pcb->snd_buf--;
}
if (flags & TCP_FIN) {
pcb->flags |= TF_FIN;