pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmo-netif/+/38987?usp=email )
Change subject: stream_cli: Fix discard 1st msg received quick after connect
......................................................................
stream_cli: Fix discard 1st msg received quick after connect
Even if setting osmo_iofd_notify_connected(), it may happen that a read
call-back is triggered towards the user before this
special write-callback is triggered.
stream_cli was already accounting for that in stream_cli_iofd_read_cb()
state STREAM_CLI_STATE_CONNECTING, but was discarding the msgb instead
of pushing it upwards towards the user through read_cb after
transitioning to STREAM_CLI_STATE_CONNECTED.
As a result, eg when an ipaccess client using stream_cli (BTS, liboamo-abis
e1_line ipaccess driver) connected to an ipaccess server (BSC) and the
server quickly transmitted an IPA ID GET, it would get lost.
Related: libosmocore.git Change-Id Ica20a050b98d117995a5b625b23ab9faa61aabee
Change-Id: I98cd51d4bb87d3572245446648ced44a23a622ef
---
M src/stream_cli.c
1 file changed, 51 insertions(+), 31 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmo-netif refs/changes/87/38987/1
diff --git a/src/stream_cli.c b/src/stream_cli.c
index fe62607..131969d 100644
--- a/src/stream_cli.c
+++ b/src/stream_cli.c
@@ -409,7 +409,8 @@
#endif
}
-static void stream_cli_handle_connecting(struct osmo_stream_cli *cli, int res)
+/* returns true if cli is freed */
+static bool stream_cli_handle_connecting(struct osmo_stream_cli *cli, int res)
{
int error, ret = res;
socklen_t len = sizeof(error);
@@ -419,14 +420,12 @@
if (ret < 0) {
LOGSCLI(cli, LOGL_ERROR, "connect failed (%d)\n", res);
- (void)stream_cli_reconnect(cli);
- return;
+ return stream_cli_reconnect(cli);
}
ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len);
if (ret >= 0 && error > 0) {
LOGSCLI(cli, LOGL_ERROR, "connect so_error (%d)\n", error);
- (void)stream_cli_reconnect(cli);
- return;
+ return stream_cli_reconnect(cli);
}
/* If messages got enqueued while 'connecting', keep WRITE flag
@@ -458,7 +457,7 @@
if (cli->connect_cb)
cli->connect_cb(cli);
cli->in_cb_mask &= ~IN_CB_MASK_CONNECT_CB;
- (void)free_delayed_if_needed(cli);
+ return free_delayed_if_needed(cli);
}
static int osmo_stream_cli_fd_cb(struct osmo_fd *ofd, unsigned int what)
@@ -528,8 +527,14 @@
switch (cli->state) {
case STREAM_CLI_STATE_CONNECTING:
- msgb_free(msg);
- stream_cli_handle_connecting(cli, res);
+ freed = stream_cli_handle_connecting(cli, res);
+ if (freed)
+ return; /* msg was also freed as part of the talloc
tree. */
+ if (cli->state != STREAM_CLI_STATE_CONNECTED) {
+ msgb_free(msg);
+ return;
+ }
+ /* Follow below common path submitting read_cb(msg) to user. */
break;
case STREAM_CLI_STATE_CONNECTED:
switch (res) {
@@ -549,35 +554,41 @@
}
if (freed)
return; /* msg was also freed as part of the talloc
tree. */
- /* Notify user of new data or error: */
- if (!cli->iofd_read_cb) {
- msgb_free(msg);
- return;
- }
- cli->in_cb_mask |= IN_CB_MASK_READ_CB;
- cli->iofd_read_cb(cli, res, msg);
- cli->in_cb_mask &= ~IN_CB_MASK_READ_CB;
- OSMO_ASSERT(cli->in_cb_mask == 0);
- (void)free_delayed_if_needed(cli);
+ /* Follow below common path submitting read_cb(msg) to user. */
break;
default:
osmo_panic("%s() called with unexpected state %d\n", __func__,
cli->state);
}
+
+ /* Notify user of new data or error: */
+ if (!cli->iofd_read_cb) {
+ msgb_free(msg);
+ return;
+ }
+ cli->in_cb_mask |= IN_CB_MASK_READ_CB;
+ cli->iofd_read_cb(cli, res, msg);
+ cli->in_cb_mask &= ~IN_CB_MASK_READ_CB;
+ OSMO_ASSERT(cli->in_cb_mask == 0);
+ (void)free_delayed_if_needed(cli);
}
static void stream_cli_iofd_write_cb(struct osmo_io_fd *iofd, int res, struct
msgb *msg)
{
struct osmo_stream_cli *cli = osmo_iofd_get_data(iofd);
+ /* msgb is not owned by us here, no need to free it. */
switch (cli->state) {
case STREAM_CLI_STATE_CONNECTING:
- stream_cli_handle_connecting(cli, res);
+ (void)stream_cli_handle_connecting(cli, res);
break;
case STREAM_CLI_STATE_CONNECTED:
if (msg && res <= 0) {
LOGSCLI(cli, LOGL_ERROR, "received error %d in response
to send\n", res);
(void)stream_cli_reconnect(cli);
}
+ /* res=0 && msgb=NULL: "connected notify", but we already
received before a read_cb
+ * which moved us to CONNECTED state. Do nothing.
+ */
break;
default:
osmo_panic("%s() called with unexpected state %d\n", __func__,
cli->state);
@@ -601,8 +612,15 @@
switch (cli->state) {
case STREAM_CLI_STATE_CONNECTING:
- msgb_free(msg);
- stream_cli_handle_connecting(cli, res);
+ LOGSCLI(cli, LOGL_NOTICE, "stream_cli_iofd_read_cb(res=%d,
msg=%p msg_len=%d)\n", res, msg, msg ? msgb_length(msg) : -1);
+ freed = stream_cli_handle_connecting(cli, res);
+ if (freed)
+ return; /* msg was also freed as part of the talloc
tree. */
+ if (cli->state != STREAM_CLI_STATE_CONNECTED) {
+ msgb_free(msg);
+ return;
+ }
+ /* Follow below common path submitting read_cb(msg) to user. */
break;
case STREAM_CLI_STATE_CONNECTED:
switch (res) {
@@ -621,20 +639,22 @@
}
if (freed)
return; /* msg was also freed as part of the talloc
tree. */
- /* Notify user of new data or error: */
- if (!cli->iofd_read_cb) {
- msgb_free(msg);
- return;
- }
- cli->in_cb_mask |= IN_CB_MASK_READ_CB;
- cli->iofd_read_cb(cli, res, msg);
- cli->in_cb_mask &= ~IN_CB_MASK_READ_CB;
- OSMO_ASSERT(cli->in_cb_mask == 0);
- (void)free_delayed_if_needed(cli);
+ /* Follow below common path submitting read_cb(msg) to user. */
break;
default:
osmo_panic("%s() called with unexpected state %d\n", __func__,
cli->state);
}
+
+ /* Notify user of new data or error: */
+ if (!cli->iofd_read_cb) {
+ msgb_free(msg);
+ return;
+ }
+ cli->in_cb_mask |= IN_CB_MASK_READ_CB;
+ cli->iofd_read_cb(cli, res, msg);
+ cli->in_cb_mask &= ~IN_CB_MASK_READ_CB;
+ OSMO_ASSERT(cli->in_cb_mask == 0);
+ (void)free_delayed_if_needed(cli);
}
static const struct osmo_io_ops osmo_stream_cli_ioops_sctp = {
--
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Gerrit-MessageType: newchange
Gerrit-Project: libosmo-netif
Gerrit-Branch: master
Gerrit-Change-Id: I98cd51d4bb87d3572245446648ced44a23a622ef
Gerrit-Change-Number: 38987
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <[email protected]>
