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util: netlink: Use virNetlinkNewLink helper to simplify virNetDev*Create

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This patch simplifies virNetDevBridgeCreate and virNetDevMacVLanCreate
functions by making use of the virNetlinkNewLink helper.

Signed-off-by: Shi Lei <shi_lei@massclouds.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This commit is contained in:
Shi Lei 2018-09-07 15:17:26 +08:00 committed by Erik Skultety
parent b6ba2b961a
commit ffd31684be
2 changed files with 26 additions and 161 deletions
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75
src/util/virnetdevbridge.c
View File

@ -416,78 +416,23 @@ int
virNetDevBridgeCreate(const char *brname)
{
/* use a netlink RTM_NEWLINK message to create the bridge */
const char *type = "bridge";
struct nlmsgerr *err;
struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
unsigned int recvbuflen;
struct nlattr *linkinfo;
VIR_AUTOPTR(virNetlinkMsg) nl_msg = NULL;
VIR_AUTOFREE(struct nlmsghdr *) resp = NULL;
int error = 0;
nl_msg = nlmsg_alloc_simple(RTM_NEWLINK,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
if (!nl_msg) {
virReportOOMError();
return -1;
}
if (nlmsg_append(nl_msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_IFNAME, strlen(brname)+1, brname) < 0)
goto buffer_too_small;
if (!(linkinfo = nla_nest_start(nl_msg, IFLA_LINKINFO)))
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_INFO_KIND, strlen(type), type) < 0)
goto buffer_too_small;
nla_nest_end(nl_msg, linkinfo);
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
return -1;
}
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 < 0) {
if (virNetlinkNewLink(brname, "bridge", NULL, &error) < 0) {
# if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
if (err->error == -EOPNOTSUPP) {
/* fallback to ioctl if netlink doesn't support creating
* bridges
*/
return virNetDevBridgeCreateWithIoctl(brname);
}
# endif
virReportSystemError(-err->error,
_("error creating bridge interface %s"),
brname);
return -1;
if (error == -EOPNOTSUPP) {
/* fallback to ioctl if netlink doesn't support creating bridges */
return virNetDevBridgeCreateWithIoctl(brname);
}
break;
# endif
if (error < 0)
virReportSystemError(-error, _("error creating bridge interface %s"),
brname);
case NLMSG_DONE:
break;
default:
goto malformed_resp;
return -1;
}
return 0;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
return -1;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
return -1;
}

112
src/util/virnetdevmacvlan.c
View File

@ -307,113 +307,33 @@ virNetDevMacVLanCreate(const char *ifname,
uint32_t macvlan_mode,
int *retry)
{
int rc = -1;
struct nlmsgerr *err;
struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
int ifindex;
unsigned int recvbuflen;
struct nl_msg *nl_msg;
struct nlattr *linkinfo, *info_data;
char macstr[VIR_MAC_STRING_BUFLEN];
VIR_AUTOFREE(struct nlmsghdr *) resp = NULL;
int error = 0;
int ifindex = 0;
virNetlinkNewLinkData data = {
.macvlan_mode = &macvlan_mode,
.mac = macaddress,
};
*retry = 0;
if (virNetDevGetIndex(srcdev, &ifindex) < 0)
return -1;
*retry = 0;
nl_msg = nlmsg_alloc_simple(RTM_NEWLINK,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
if (!nl_msg) {
virReportOOMError();
return -1;
}
if (nlmsg_append(nl_msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put_u32(nl_msg, IFLA_LINK, ifindex) < 0)
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_ADDRESS, VIR_MAC_BUFLEN, macaddress) < 0)
goto buffer_too_small;
if (ifname &&
nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
goto buffer_too_small;
if (!(linkinfo = nla_nest_start(nl_msg, IFLA_LINKINFO)))
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_INFO_KIND, strlen(type), type) < 0)
goto buffer_too_small;
if (macvlan_mode > 0) {
if (!(info_data = nla_nest_start(nl_msg, IFLA_INFO_DATA)))
goto buffer_too_small;
if (nla_put(nl_msg, IFLA_MACVLAN_MODE, sizeof(macvlan_mode),
&macvlan_mode) < 0)
goto buffer_too_small;
nla_nest_end(nl_msg, info_data);
}
nla_nest_end(nl_msg, linkinfo);
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
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;
switch (err->error) {
case 0:
break;
case -EEXIST:
data.ifindex = &ifindex;
if (virNetlinkNewLink(ifname, type, &data, &error) < 0) {
char macstr[VIR_MAC_STRING_BUFLEN];
if (error == -EEXIST)
*retry = 1;
goto cleanup;
default:
virReportSystemError(-err->error,
else if (error < 0)
virReportSystemError(-error,
_("error creating %s interface %s@%s (%s)"),
type, ifname, srcdev,
virMacAddrFormat(macaddress, macstr));
goto cleanup;
}
break;
case NLMSG_DONE:
break;
default:
goto malformed_resp;
return -1;
}
rc = 0;
cleanup:
nlmsg_free(nl_msg);
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;
return 0;
}
/**