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tcp.h, opt.h, api.h, api_msg.h, tcp.c, tcp_in.c, api_lib.c, api_msg.c, sockets.c, init.c: task #7252: Implement TCP listen backlog: Warning: raw API applications have to call 'tcp_accepted(pcb)' in their accept callback to keep accepting new connections.

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This commit is contained in:
goldsimon 2007-12-21 16:47:56 +00:00
parent 48e62e25e9
commit 1ed34774c8
11 changed files with 93 additions and 11 deletions
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6
CHANGELOG
View File

@ -19,6 +19,12 @@ HISTORY
++ New features:
2007-12-21 Frédéric Bernon, Simon Goldschmidt, Jonathan Larmour
* tcp.h, opt.h, api.h, api_msg.h, tcp.c, tcp_in.c, api_lib.c, api_msg.c,
sockets.c, init.c: task #7252: Implement TCP listen backlog: Warning: raw API
applications have to call 'tcp_accepted(pcb)' in their accept callback to
keep accepting new connections.
2007-12-13 Frédéric Bernon
* api_msg.c, err.h, err.c, sockets.c, dns.c, dns.h: replace "enum dns_result"
by err_t type. Add a new err_t code "ERR_INPROGRESS".

28
src/api/api_lib.c
View File

@ -261,16 +261,23 @@ netconn_disconnect(struct netconn *conn)
* Set a TCP netconn into listen mode
*
* @param conn the tcp netconn to set to listen mode
* @param backlog the listen backlog (0 = max), only used if LWIP_LISTEN_BACKLOG==1
* @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
* don't return any error (yet?))
*/
err_t
netconn_listen(struct netconn *conn)
netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
{
struct api_msg msg;
/* This does no harm. If LWIP_LISTEN_BACKLOG is off, backlog is unused. */
LWIP_UNUSED_ARG(backlog);
LWIP_ERROR("netconn_listen: invalid conn", (conn != NULL), return ERR_ARG;);
#if LWIP_LISTEN_BACKLOG
msg.msg.msg.lb.backlog = backlog;
#endif /* LWIP_LISTEN_BACKLOG */
msg.function = do_listen;
msg.msg.conn = conn;
TCPIP_APIMSG(&msg);
@ -292,15 +299,26 @@ netconn_accept(struct netconn *conn)
LWIP_ERROR("netconn_accept: invalid acceptmbox", (conn->acceptmbox != SYS_MBOX_NULL), return NULL;);
#if LWIP_SO_RCVTIMEO
if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
newconn = NULL;
}
} else
#else
sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, 0);
#endif /* LWIP_SO_RCVTIMEO*/
{
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
#if LWIP_LISTEN_BACKLOG
if (newconn != NULL) {
/* Let the stack know that we have accepted the connection. */
struct api_msg msg;
msg.function = do_recv;
msg.msg.conn = conn;
TCPIP_APIMSG(&msg);
}
#endif /* LWIP_LISTEN_BACKLOG */
}
return newconn;
}

12
src/api/api_msg.c
View File

@ -735,6 +735,9 @@ do_listen(struct api_msg_msg *msg)
if (msg->conn->err == ERR_OK) {
msg->conn->state = NETCONN_LISTEN;
msg->conn->pcb.tcp = lpcb;
#if LWIP_LISTEN_BACKLOG
tcp_backlog(lpcb, msg->msg.lb.backlog);
#endif /* LWIP_LISTEN_BACKLOG */
tcp_arg(msg->conn->pcb.tcp, msg->conn);
tcp_accept(msg->conn->pcb.tcp, accept_function);
}
@ -800,7 +803,14 @@ do_recv(struct api_msg_msg *msg)
if (!ERR_IS_FATAL(msg->conn->err)) {
if (msg->conn->pcb.tcp != NULL) {
if (msg->conn->type == NETCONN_TCP) {
tcp_recved(msg->conn->pcb.tcp, msg->msg.r.len);
#if LWIP_LISTEN_BACKLOG
if (msg->conn->pcb.tcp->state == LISTEN) {
tcp_accepted(msg->conn->pcb.tcp);
} else
#endif /* LWIP_LISTEN_BACKLOG */
{
tcp_recved(msg->conn->pcb.tcp, msg->msg.r.len);
}
}
}
}

8
src/api/sockets.c
View File

@ -430,15 +430,15 @@ lwip_listen(int s, int backlog)
struct lwip_socket *sock;
err_t err;
/* This does no harm. If debugging is off, backlog is unused. */
LWIP_UNUSED_ARG(backlog);
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d, backlog=%d)\n", s, backlog));
LWIP_ASSERT("backlog must be between 0 and 255", backlog > 0);
LWIP_ASSERT("backlog must be between 0 and 255", backlog <= 0xff);
sock = get_socket(s);
if (!sock)
return -1;
err = netconn_listen(sock->conn);
err = netconn_listen_with_backlog(sock->conn, backlog);
if (err != ERR_OK) {
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d) failed, err=%d\n", s, err));

4
src/core/init.c
View File

@ -152,6 +152,10 @@
#if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
#error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
#endif
#if (LWIP_DEFAULT_LISTEN_BACKLOG < 0) || (LWIP_DEFAULT_LISTEN_BACKLOG > 255)
#error "LWIP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
#endif
/* Compile-time checks for deprecated options.
*/

4
src/core/tcp.c
View File

@ -368,6 +368,10 @@ tcp_listen(struct tcp_pcb *pcb)
#if LWIP_CALLBACK_API
lpcb->accept = tcp_accept_null;
#endif /* LWIP_CALLBACK_API */
#if LWIP_LISTEN_BACKLOG
lpcb->accepts_pending = 0;
lpcb->backlog = LWIP_DEFAULT_LISTEN_BACKLOG;
#endif /* LWIP_LISTEN_BACKLOG */
TCP_REG(&tcp_listen_pcbs.listen_pcbs, lpcb);
return (struct tcp_pcb *)lpcb;
}

8
src/core/tcp_in.c
View File

@ -381,6 +381,11 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
tcphdr->dest, tcphdr->src);
} else if (flags & TCP_SYN) {
LWIP_DEBUGF(TCP_DEBUG, ("TCP connection request %"U16_F" -> %"U16_F".\n", tcphdr->src, tcphdr->dest));
#if LWIP_LISTEN_BACKLOG
if (pcb->accepts_pending >= pcb->backlog) {
return ERR_ABRT;
}
#endif /* LWIP_LISTEN_BACKLOG */
npcb = tcp_alloc(pcb->prio);
/* If a new PCB could not be created (probably due to lack of memory),
we don't do anything, but rely on the sender will retransmit the
@ -390,6 +395,9 @@ tcp_listen_input(struct tcp_pcb_listen *pcb)
TCP_STATS_INC(tcp.memerr);
return ERR_MEM;
}
#if LWIP_LISTEN_BACKLOG
pcb->accepts_pending++;
#endif /* LWIP_LISTEN_BACKLOG */
/* Set up the new PCB. */
ip_addr_set(&(npcb->local_ip), &(iphdr->dest));
npcb->local_port = pcb->local_port;

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

@ -179,7 +179,8 @@ err_t netconn_connect (struct netconn *conn,
struct ip_addr *addr,
u16_t port);
err_t netconn_disconnect (struct netconn *conn);
err_t netconn_listen (struct netconn *conn);
err_t netconn_listen_with_backlog(struct netconn *conn, u8_t backlog);
#define netconn_listen(conn) netconn_listen_with_backlog(conn, LWIP_DEFAULT_LISTEN_BACKLOG);
struct netconn * netconn_accept (struct netconn *conn);
struct netbuf * netconn_recv (struct netconn *conn);
err_t netconn_sendto (struct netconn *conn,

5
src/include/lwip/api_msg.h
View File

@ -93,6 +93,11 @@ struct api_msg_msg {
enum netconn_igmp join_or_leave;
} jl;
#endif /* LWIP_IGMP */
#if LWIP_LISTEN_BACKLOG
struct {
u8_t backlog;
} lb;
#endif /* LWIP_LISTEN_BACKLOG */
} msg;
};

17
src/include/lwip/opt.h
View File

@ -728,6 +728,23 @@
#define LWIP_CALLBACK_API 0
#endif
/**
* LWIP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
*/
#ifndef LWIP_LISTEN_BACKLOG
#define LWIP_LISTEN_BACKLOG 1
#endif
/**
* The maximum allowed backlog for TCP listen netconns.
* This backlog is used unless another is explicitly specified.
* 0xff is the maximum (u8_t).
*/
#ifndef LWIP_DEFAULT_LISTEN_BACKLOG
#define LWIP_DEFAULT_LISTEN_BACKLOG 0xff
#endif
/*
----------------------------------
---------- Pbuf options ----------

9
src/include/lwip/tcp.h
View File

@ -79,6 +79,11 @@ void tcp_err (struct tcp_pcb *pcb,
#define tcp_mss(pcb) ((pcb)->mss)
#define tcp_sndbuf(pcb) ((pcb)->snd_buf)
#if LWIP_LISTEN_BACKLOG
#define tcp_accepted(pcb) (((struct tcp_pcb_listen *)(pcb))->accepts_pending--)
#define tcp_backlog(pcb, bklog) (((struct tcp_pcb_listen *)(pcb))->backlog = bklog)
#endif /* LWIP_LISTEN_BACKLOG */
void tcp_recved (struct tcp_pcb *pcb, u16_t len);
err_t tcp_bind (struct tcp_pcb *pcb, struct ip_addr *ipaddr,
u16_t port);
@ -412,6 +417,10 @@ struct tcp_pcb_listen {
*/
err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err);
#endif /* LWIP_CALLBACK_API */
#if LWIP_LISTEN_BACKLOG
u8_t backlog;
u8_t accepts_pending;
#endif /* LWIP_LISTEN_BACKLOG */
};
#if LWIP_EVENT_API