pespin has uploaded this change for review.
hnbgw: Fix recent regression not closing conn upon rx of SCTP_SHUTDOWN_EVENT
Before handling of OSMO_STREAM_SCTP_MSG_FLAGS_NOTIFICATION in recent
commit (see Fixes: below), osmo_stream_srv_recv() and
internal _sctp_recvmsg_wrapper() in libosmo-netif would return either -EAGAIN or 0
when an sctp notification was received from the kernel.
After adding handling of OSMO_STREAM_SCTP_MSG_FLAGS_NOTIFICATION, the
code paths for "rc == -EAGAIN" and "rc == 0" would not be executed
anymore since the first branch takes preference in the if-else
tree. For "rc == -EAGAIN" it's fine because the new branch superseeds
what's done on the "rc == -EAGAIN" branch. However, for the "rc == 0",
we forgot to actually destroy the connection. The "rc == 0" branch was
basically reached when SCTP_SHUTDOWN_EVENT was received because
osmo_stream_srv_recv() tried to resemble the interface of regular
recv(); let's hence check for that explicitly and destroy the conn object
(and the related hnb context in the process) when we receive that event.
Fixes: 1de2091515530e531196ebca27b1445cecd1b88d
Related: SYS#6113
Change-Id: I11b6af51a58dc250975a696b98d0c0c9ff3df9e0
---
M src/osmo-hnbgw/hnbgw.c
1 file changed, 11 insertions(+), 4 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/51/29451/1
diff --git a/src/osmo-hnbgw/hnbgw.c b/src/osmo-hnbgw/hnbgw.c
index 124a647..6d75525 100644
--- a/src/osmo-hnbgw/hnbgw.c
+++ b/src/osmo-hnbgw/hnbgw.c
@@ -254,6 +254,7 @@
/* Notification received */
if (msgb_sctp_msg_flags(msg) & OSMO_STREAM_SCTP_MSG_FLAGS_NOTIFICATION) {
union sctp_notification *notif = (union sctp_notification *)msgb_data(msg);
+ rc = 0;
switch (notif->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE:
switch (notif->sn_assoc_change.sac_state) {
@@ -261,17 +262,23 @@
LOGHNB(hnb, DMAIN, LOGL_NOTICE, "HNB SCTP conn RESTARTed, marking as HNBAP-unregistered\n");
hnb->hnb_registered = false;
break;
+ case SCTP_SHUTDOWN_EVENT:
+ LOGHNB(hnb, DMAIN, LOGL_NOTICE,
+ "sctp_recvmsg(%s) = SCTP_SHUTDOWN_EVENT, closing conn\n",
+ osmo_sock_get_name2(osmo_stream_srv_get_ofd(conn)->fd));
+ osmo_stream_srv_destroy(conn);
+ rc = -1;
+ break;
}
break;
}
- msgb_free(msg);
- return 0;
+ goto out;
} else if (rc == -EAGAIN) {
/* Older versions of osmo_stream_srv_recv() not supporting
* msgb_sctp_msg_flags() may still return -EAGAIN when an sctp
* notification is received. */
- msgb_free(msg);
- return 0;
+ rc = 0;
+ goto out;
} else if (rc < 0) {
LOGHNB(hnb, DMAIN, LOGL_ERROR, "Error during sctp_recvmsg(%s)\n",
osmo_sock_get_name2(osmo_stream_srv_get_ofd(conn)->fd));
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