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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>
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@ -2387,6 +2387,7 @@ virNetlinkEventServiceStart;
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virNetlinkEventServiceStop;
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virNetlinkEventServiceStopAll;
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virNetlinkGetErrorCode;
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virNetlinkGetNeighbor;
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virNetlinkShutdown;
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virNetlinkStartup;
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@ -590,6 +590,88 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
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goto cleanup;
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}
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/**
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* virNetlinkGetNeighbor:
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*
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* @nlData: Gets a pointer to the raw data from netlink.
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MUST BE FREED BY CALLER!
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* @src_pid: pid used for nl_pid of the local end of the netlink message
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* (0 == "use getpid()")
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* @dst_pid: pid of destination nl_pid if the kernel
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* is not the target of the netlink message but it is to be
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* sent to another process (0 if sending to the kernel)
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*
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* Get neighbor table entry from netlink.
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*
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* Returns 0 on success, -1 on fatal error.
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*/
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int
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virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
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{
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int rc = -1;
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struct nlmsghdr *resp = NULL;
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struct nlmsgerr *err;
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struct ndmsg ndinfo = {
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.ndm_family = AF_UNSPEC,
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};
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unsigned int recvbuflen;
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struct nl_msg *nl_msg;
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nl_msg = nlmsg_alloc_simple(RTM_GETNEIGH, NLM_F_DUMP | NLM_F_REQUEST);
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if (!nl_msg) {
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virReportOOMError();
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return -1;
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}
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if (nlmsg_append(nl_msg, &ndinfo, sizeof(ndinfo), NLMSG_ALIGNTO) < 0)
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goto buffer_too_small;
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if (virNetlinkCommand(nl_msg, &resp, &recvbuflen,
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src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
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goto cleanup;
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if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
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goto malformed_resp;
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switch (resp->nlmsg_type) {
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case NLMSG_ERROR:
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err = (struct nlmsgerr *)NLMSG_DATA(resp);
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if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
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goto malformed_resp;
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if (err->error) {
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virReportSystemError(-err->error,
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"%s", _("error dumping"));
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goto cleanup;
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}
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break;
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case RTM_NEWNEIGH:
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break;
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default:
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goto malformed_resp;
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}
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rc = recvbuflen;
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cleanup:
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nlmsg_free(nl_msg);
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if (rc < 0)
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VIR_FREE(resp);
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*nlData = resp;
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return rc;
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malformed_resp:
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("malformed netlink response message"));
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goto cleanup;
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buffer_too_small:
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("allocated netlink buffer is too small"));
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goto cleanup;
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}
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int
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virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen)
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@ -71,6 +71,8 @@ int virNetlinkDumpLink(const char *ifname, int ifindex,
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void **nlData, struct nlattr **tb,
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uint32_t src_pid, uint32_t dst_pid)
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ATTRIBUTE_RETURN_CHECK;
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int
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virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid);
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typedef void (*virNetlinkEventHandleCallback)(struct nlmsghdr *,
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unsigned int length,
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