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BUG25622: handle return code of tcp_enqueue in tcp_listen_input()

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This commit is contained in:
kieranm 2009-03-26 14:31:02 +00:00
parent 84505d4cc8
commit efac109803
4 changed files with 22 additions and 9 deletions
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6
CHANGELOG
View File

@ -76,7 +76,11 @@ HISTORY
++ Bugfixes:
2009-03-26 Kieran Mansley
* tcp_out.c: set TCP_ACK flag on keepalive and zero window probes
* tcp.c, tcp_in.c, tcp.h: add tcp_abandon() to cope with dropping
connections where no reset required (bug #25622)
* tcp_out.c: set TCP_ACK flag on keepalive and zero window probes
(bug #20779)
2009-02-18 Simon Goldschmidt (Jonathan Larmour and Bill Auerbach)
* ip_frag.c: patch #6528: the buffer used for IP_FRAG_USES_STATIC_BUF could be

15
src/core/tcp.c
View File

@ -186,14 +186,15 @@ tcp_close(struct tcp_pcb *pcb)
}
/**
* Aborts a connection by sending a RST to the remote host and deletes
* the local protocol control block. This is done when a connection is
* killed because of shortage of memory.
* Abandons a connection and optionally sends a RST to the remote
* host. Deletes the local protocol control block. This is done when
* a connection is killed because of shortage of memory.
*
* @param pcb the tcp_pcb to abort
* @param reset boolean to indicate whether a reset should be sent
*/
void
tcp_abort(struct tcp_pcb *pcb)
tcp_abandon(struct tcp_pcb *pcb, int reset)
{
u32_t seqno, ackno;
u16_t remote_port, local_port;
@ -235,8 +236,10 @@ tcp_abort(struct tcp_pcb *pcb)
#endif /* TCP_QUEUE_OOSEQ */
memp_free(MEMP_TCP_PCB, pcb);
TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abort: sending RST\n"));
tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
if (reset) {
LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
}
}
}

7
src/core/tcp_in.c
View File

@ -394,6 +394,7 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
{
struct tcp_pcb *npcb;
u32_t optdata;
err_t rc;
/* In the LISTEN state, we check for incoming SYN segments,
creates a new PCB, and responds with a SYN|ACK. */
@ -454,7 +455,11 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
/* Build an MSS option. */
optdata = TCP_BUILD_MSS_OPTION();
/* Send a SYN|ACK together with the MSS option. */
tcp_enqueue(npcb, NULL, 0, TCP_SYN | TCP_ACK, 0, (u8_t *)&optdata, 4);
rc = tcp_enqueue(npcb, NULL, 0, TCP_SYN | TCP_ACK, 0, (u8_t *)&optdata, 4);
if (rc != ERR_OK) {
tcp_abandon(npcb, 0);
return rc;
}
return tcp_output(npcb);
}
return ERR_OK;

3
src/include/lwip/tcp.h
View File

@ -96,7 +96,8 @@ err_t tcp_connect (struct tcp_pcb *pcb, struct ip_addr *ipaddr,
struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
#define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
void tcp_abort (struct tcp_pcb *pcb);
void tcp_abandon (struct tcp_pcb *pcb, int reset);
#define tcp_abort(pcb) tcp_abandon((pcb), 1)
err_t tcp_close (struct tcp_pcb *pcb);
/* Flags for "apiflags" parameter in tcp_write and tcp_enqueue */