QIOChannelSocket: Add support for MSG_ZEROCOPY + IPV6

For using MSG_ZEROCOPY, there are two steps:
1 - io_writev() the packet, which enqueues the packet for sending, and
2 - io_flush(), which gets confirmation that all packets got correctly sent

Currently, if MSG_ZEROCOPY is used to send packets over IPV6, no error will
be reported in (1), but it will fail in the first time (2) happens.

This happens because (2) currently checks for cmsg_level & cmsg_type
associated with IPV4 only, before reporting any error.

Add checks for cmsg_level & cmsg_type associated with IPV6, and thus enable
support for MSG_ZEROCOPY + IPV6

Fixes: 2bc58ffc29 ("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

diff --git a/io/channel-socket.c b/io/channel-socket.c
index 74a936cc1f8e8dfdcad562bd2ab2aed079ef66ec..b76dca9cc1bfcc6237e61f13c44838cad355245f 100644 (file)
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -746,8 +746,8 @@ static int qio_channel_socket_flush(QIOChannel *ioc,
         }
 
         cm = CMSG_FIRSTHDR(&msg);
-        if (cm->cmsg_level != SOL_IP &&
-            cm->cmsg_type != IP_RECVERR) {
+        if (cm->cmsg_level != SOL_IP   && cm->cmsg_type != IP_RECVERR &&
+            cm->cmsg_level != SOL_IPV6 && cm->cmsg_type != IPV6_RECVERR) {
             error_setg_errno(errp, EPROTOTYPE,
                              "Wrong cmsg in errqueue");
             return -1;