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A file for vsock-related helper functions. virVsockSetGuestCid to set an already-known CID, virVsockAcquireGuestCid that will use the first available CID https://bugzilla.redhat.com/show_bug.cgi?id=1291851 Signed-off-by: Ján Tomko <jtomko@redhat.com>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include <sys/ioctl.h>
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#if HAVE_DECL_VHOST_VSOCK_SET_GUEST_CID
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# include <linux/vhost.h>
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#endif
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#include "virvsock.h"
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#include "virerror.h"
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#include "virlog.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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VIR_LOG_INIT("util.vsock");
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#if HAVE_DECL_VHOST_VSOCK_SET_GUEST_CID
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static int
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virVsockSetGuestCidQuiet(int fd,
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unsigned int guest_cid)
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{
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uint64_t val = guest_cid;
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return ioctl(fd, VHOST_VSOCK_SET_GUEST_CID, &val);
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}
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#else
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static int
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virVsockSetGuestCidQuiet(int fd ATTRIBUTE_UNUSED,
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unsigned int guest_cid ATTRIBUTE_UNUSED)
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{
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errno = ENOSYS;
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return -1;
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}
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#endif
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/**
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* virVsockSetGuestCid:
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* @fd: file descriptor of a vsock interface
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* @guest_cid: guest CID to be set
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*
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* Wrapper for VHOST_VSOCK_SET_GUEST_CID ioctl.
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* Returns: 0 on success, -1 on error.
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*/
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int
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virVsockSetGuestCid(int fd,
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unsigned int guest_cid)
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{
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if (virVsockSetGuestCidQuiet(fd, guest_cid) < 0) {
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virReportSystemError(errno, "%s",
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_("failed to set guest cid"));
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return -1;
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}
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return 0;
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}
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#define VIR_VSOCK_GUEST_CID_MIN 3
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/**
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* virVsockAcquireGuestCid:
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* @fd: file descriptor of a vsock interface
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* @guest_cid: where to store the guest CID
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*
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* Iterates over usable CIDs until a free one is found.
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* Returns: 0 on success, with the acquired CID stored in guest_cid
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* -1 on error.
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*/
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int
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virVsockAcquireGuestCid(int fd,
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unsigned int *guest_cid)
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{
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unsigned int cid = VIR_VSOCK_GUEST_CID_MIN;
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for (; virVsockSetGuestCidQuiet(fd, cid) < 0; cid++) {
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if (errno != EADDRINUSE) {
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virReportSystemError(errno, "%s",
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_("failed to acquire guest cid"));
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return -1;
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}
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}
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*guest_cid = cid;
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return 0;
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}
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