mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-08-28 11:31:16 +00:00
util: introduce virNetlinkGetNeighbor to get neighbor table entry
use RTM_GETNEIGH to query arp table entry by netlink socket Signed-off-by: Chen Hanxiao <chenhanxiao@gmail.com>
This commit is contained in:
parent
892e37d5a4
commit
414e61109c
@ -2387,6 +2387,7 @@ virNetlinkEventServiceStart;
|
|||||||
virNetlinkEventServiceStop;
|
virNetlinkEventServiceStop;
|
||||||
virNetlinkEventServiceStopAll;
|
virNetlinkEventServiceStopAll;
|
||||||
virNetlinkGetErrorCode;
|
virNetlinkGetErrorCode;
|
||||||
|
virNetlinkGetNeighbor;
|
||||||
virNetlinkShutdown;
|
virNetlinkShutdown;
|
||||||
virNetlinkStartup;
|
virNetlinkStartup;
|
||||||
|
|
||||||
|
@ -590,6 +590,88 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
|
|||||||
goto cleanup;
|
goto cleanup;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* virNetlinkGetNeighbor:
|
||||||
|
*
|
||||||
|
* @nlData: Gets a pointer to the raw data from netlink.
|
||||||
|
MUST BE FREED BY CALLER!
|
||||||
|
* @src_pid: pid used for nl_pid of the local end of the netlink message
|
||||||
|
* (0 == "use getpid()")
|
||||||
|
* @dst_pid: pid of destination nl_pid if the kernel
|
||||||
|
* is not the target of the netlink message but it is to be
|
||||||
|
* sent to another process (0 if sending to the kernel)
|
||||||
|
*
|
||||||
|
* Get neighbor table entry from netlink.
|
||||||
|
*
|
||||||
|
* Returns 0 on success, -1 on fatal error.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
|
||||||
|
{
|
||||||
|
int rc = -1;
|
||||||
|
struct nlmsghdr *resp = NULL;
|
||||||
|
struct nlmsgerr *err;
|
||||||
|
struct ndmsg ndinfo = {
|
||||||
|
.ndm_family = AF_UNSPEC,
|
||||||
|
};
|
||||||
|
unsigned int recvbuflen;
|
||||||
|
struct nl_msg *nl_msg;
|
||||||
|
|
||||||
|
nl_msg = nlmsg_alloc_simple(RTM_GETNEIGH, NLM_F_DUMP | NLM_F_REQUEST);
|
||||||
|
if (!nl_msg) {
|
||||||
|
virReportOOMError();
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (nlmsg_append(nl_msg, &ndinfo, sizeof(ndinfo), NLMSG_ALIGNTO) < 0)
|
||||||
|
goto buffer_too_small;
|
||||||
|
|
||||||
|
|
||||||
|
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen,
|
||||||
|
src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
|
||||||
|
goto cleanup;
|
||||||
|
|
||||||
|
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
|
||||||
|
goto malformed_resp;
|
||||||
|
|
||||||
|
switch (resp->nlmsg_type) {
|
||||||
|
case NLMSG_ERROR:
|
||||||
|
err = (struct nlmsgerr *)NLMSG_DATA(resp);
|
||||||
|
if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
|
||||||
|
goto malformed_resp;
|
||||||
|
|
||||||
|
if (err->error) {
|
||||||
|
virReportSystemError(-err->error,
|
||||||
|
"%s", _("error dumping"));
|
||||||
|
goto cleanup;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RTM_NEWNEIGH:
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
goto malformed_resp;
|
||||||
|
}
|
||||||
|
rc = recvbuflen;
|
||||||
|
|
||||||
|
cleanup:
|
||||||
|
nlmsg_free(nl_msg);
|
||||||
|
if (rc < 0)
|
||||||
|
VIR_FREE(resp);
|
||||||
|
*nlData = resp;
|
||||||
|
return rc;
|
||||||
|
|
||||||
|
malformed_resp:
|
||||||
|
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
|
||||||
|
_("malformed netlink response message"));
|
||||||
|
goto cleanup;
|
||||||
|
|
||||||
|
buffer_too_small:
|
||||||
|
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
|
||||||
|
_("allocated netlink buffer is too small"));
|
||||||
|
goto cleanup;
|
||||||
|
}
|
||||||
|
|
||||||
int
|
int
|
||||||
virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen)
|
virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen)
|
||||||
|
@ -71,6 +71,8 @@ int virNetlinkDumpLink(const char *ifname, int ifindex,
|
|||||||
void **nlData, struct nlattr **tb,
|
void **nlData, struct nlattr **tb,
|
||||||
uint32_t src_pid, uint32_t dst_pid)
|
uint32_t src_pid, uint32_t dst_pid)
|
||||||
ATTRIBUTE_RETURN_CHECK;
|
ATTRIBUTE_RETURN_CHECK;
|
||||||
|
int
|
||||||
|
virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid);
|
||||||
|
|
||||||
typedef void (*virNetlinkEventHandleCallback)(struct nlmsghdr *,
|
typedef void (*virNetlinkEventHandleCallback)(struct nlmsghdr *,
|
||||||
unsigned int length,
|
unsigned int length,
|
||||||
|
Loading…
Reference in New Issue
Block a user