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vhost-user: support receiving file descriptors in slave_read 

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tiwei Bie 2018-04-12 23:12:29 +08:00 committed by Michael S. Tsirkin
parent 703878e2e0
commit 1f3a4519b1
1 changed files with 40 additions and 1 deletions
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41
hw/virtio/vhost-user.c
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@ -852,14 +852,44 @@ static void slave_read(void *opaque)
VhostUserHeader hdr = { 0, };
VhostUserPayload payload = { 0, };
int size, ret = 0;
struct iovec iov;
struct msghdr msgh;
int fd = -1;
char control[CMSG_SPACE(sizeof(fd))];
struct cmsghdr *cmsg;
size_t fdsize;
memset(&msgh, 0, sizeof(msgh));
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_control = control;
msgh.msg_controllen = sizeof(control);
/* Read header */
size = read(u->slave_fd, &hdr, VHOST_USER_HDR_SIZE);
iov.iov_base = &hdr;
iov.iov_len = VHOST_USER_HDR_SIZE;
size = recvmsg(u->slave_fd, &msgh, 0);
if (size != VHOST_USER_HDR_SIZE) {
error_report("Failed to read from slave.");
goto err;
}
if (msgh.msg_flags & MSG_CTRUNC) {
error_report("Truncated message.");
goto err;
}
for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
fdsize = cmsg->cmsg_len - CMSG_LEN(0);
memcpy(&fd, CMSG_DATA(cmsg), fdsize);
break;
}
}
if (hdr.size > VHOST_USER_PAYLOAD_SIZE) {
error_report("Failed to read msg header."
" Size %d exceeds the maximum %zu.", hdr.size,
@ -883,9 +913,15 @@ static void slave_read(void *opaque)
break;
default:
error_report("Received unexpected msg type.");
if (fd != -1) {
close(fd);
}
ret = -EINVAL;
}
/* Message handlers need to make sure that fd will be consumed. */
fd = -1;
/*
* REPLY_ACK feature handling. Other reply types has to be managed
* directly in their request handlers.
@ -918,6 +954,9 @@ err:
qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
close(u->slave_fd);
u->slave_fd = -1;
if (fd != -1) {
close(fd);
}
return;
}