[PATCH v2 4/4] virnetlink: Split virNetlinkBridgeVlanFilterSet()

From: Michal Privoznik <mprivozn(a)redhat.com&gt; Currently, virNetlinkBridgeVlanFilterSet() takes @cmd as the second argument where either RTM_SETLINK or RTM_DELLINK is expected. Both of these constants come from linux/rtnetlink.h and thus are undefined when building without netlink. This design also clashes with the whole point of virnetlink: to offload netlink dependency onto a single file. Therefore, drop the argument, turn virNetlinkBridgeVlanFilterSet() into just setter, effectively, and introduce virNetlinkBridgeVlanFilterDel() for the case when RTM_DELLINK would be passed as @cmd. Resolves: https://gitlab.com/libvirt/libvirt/-/issues/770 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; Reviewed-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- src/util/virnetdevbridge.c | 8 ++--- src/util/virnetlink.c | 73 +++++++++++++++++++++++++++++++++----- src/util/virnetlink.h | 5 ++- 3 files changed, 73 insertions(+), 13 deletions(-) diff --git a/src/util/virnetdevbridge.c b/src/util/virnetdevbridge.c index 806ccc5fa7..20c7a25585 100644 --- a/src/util/virnetdevbridge.c +++ b/src/util/virnetdevbridge.c @@ -321,7 +321,7 @@ virNetDevBridgeSetupVlans(const char *ifname, const virNetDevVlan *virtVlan) return 0; /* The interface will have been automatically added to vlan 1, so remove it. */ - if (virNetlinkBridgeVlanFilterSet(ifname, RTM_DELLINK, 0, 1, &error) < 0) { + if (virNetlinkBridgeVlanFilterDel(ifname, 1, &error) < 0) { if (error != 0) { virReportSystemError(-error, _("error removing vlan filter from interface %1$s"), @@ -341,7 +341,7 @@ virNetDevBridgeSetupVlans(const char *ifname, const virNetDevVlan *virtVlan) flags |= BRIDGE_VLAN_INFO_UNTAGGED; } - if (virNetlinkBridgeVlanFilterSet(ifname, RTM_SETLINK, flags, + if (virNetlinkBridgeVlanFilterSet(ifname, flags, virtVlan->nativeTag, &error) < 0) { goto error; } @@ -349,7 +349,7 @@ virNetDevBridgeSetupVlans(const char *ifname, const virNetDevVlan *virtVlan) for (i = 0; i < virtVlan->nTags; i++) { if (virtVlan->tag[i] != virtVlan->nativeTag) - if (virNetlinkBridgeVlanFilterSet(ifname, RTM_SETLINK, 0, + if (virNetlinkBridgeVlanFilterSet(ifname, 0, virtVlan->tag[i], &error) < 0) { goto error; } @@ -357,7 +357,7 @@ virNetDevBridgeSetupVlans(const char *ifname, const virNetDevVlan *virtVlan) } else { /* In native mode, add the single VLAN as pvid untagged. */ flags = BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED; - if (virNetlinkBridgeVlanFilterSet(ifname, RTM_SETLINK, flags, + if (virNetlinkBridgeVlanFilterSet(ifname, flags, virtVlan->tag[0], &error) < 0) { goto error; } diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c index e3fcabca15..8f6dd86d0f 100644 --- a/src/util/virnetlink.c +++ b/src/util/virnetlink.c @@ -702,7 +702,7 @@ virNetlinkDelLink(const char *ifname, virNetlinkTalkFallback fallback) } /** - * virNetlinkBridgeVlanFilterSet: + * virNetlinkBridgeVlanFilterHelper: * * @ifname: name of the link * @cmd: netlink command, either RTM_SETLINK or RTM_DELLINK @@ -717,12 +717,12 @@ virNetlinkDelLink(const char *ifname, virNetlinkTalkFallback fallback) * non-zero, then a netlink failure occurred, but no error message * is generated leaving it up to the caller to handle the condition. */ -int -virNetlinkBridgeVlanFilterSet(const char *ifname, - int cmd, - const unsigned short flags, - const short vid, - int *error) +static int +virNetlinkBridgeVlanFilterHelper(const char *ifname, + int cmd, + const unsigned short flags, + const short vid, + int *error) { struct ifinfomsg ifm = { .ifi_family = PF_BRIDGE }; struct bridge_vlan_info vinfo = { .flags = flags, .vid = vid }; @@ -767,6 +767,55 @@ virNetlinkBridgeVlanFilterSet(const char *ifname, return 0; } + +/** + * virNetlinkBridgeVlanFilterSet: + * + * @ifname: name of the link + * @flags: flags to use when adding the vlan filter + * @vid: vlan id to add + * @error: netlink error code + * + * Add a vlan filter from an interface associated with a bridge. + * + * Returns 0 on success, -1 on error. Additionally, if the @error is + * non-zero, then a netlink failure occurred, but no error message + * is generated leaving it up to the caller to handle the condition. + */ +int +virNetlinkBridgeVlanFilterSet(const char *ifname, + const unsigned short flags, + const short vid, + int *error) +{ + return virNetlinkBridgeVlanFilterHelper(ifname, RTM_SETLINK, + flags, vid, error); +} + + +/** + * virNetlinkBridgeVlanFilterDel: + * + * @ifname: name of the link + * @vid: vlan id to remove + * @error: netlink error code + * + * Remove a vlan filter from an interface associated with a bridge. + * + * Returns 0 on success, -1 on error. Additionally, if the @error is + * non-zero, then a netlink failure occurred, but no error message + * is generated leaving it up to the caller to handle the condition. + */ +int +virNetlinkBridgeVlanFilterDel(const char *ifname, + const short vid, + int *error) +{ + return virNetlinkBridgeVlanFilterHelper(ifname, + RTM_DELLINK, 0, vid, error); +} + + /** * virNetlinkGetNeighbor: * @@ -1346,7 +1395,6 @@ virNetlinkNewLink(const char *ifname G_GNUC_UNUSED, int virNetlinkBridgeVlanFilterSet(const char *ifname G_GNUC_UNUSED, - int cmd G_GNUC_UNUSED, const unsigned short unusedflags G_GNUC_UNUSED, const short vid G_GNUC_UNUSED, int *error) @@ -1356,6 +1404,15 @@ virNetlinkBridgeVlanFilterSet(const char *ifname G_GNUC_UNUSED, return -1; } +int +virNetlinkBridgeVlanFilterDel(const char *ifname G_GNUC_UNUSED, + const short vid G_GNUC_UNUSED, + int *error G_GNUC_UNUSED) +{ + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported)); + return -1; +} + int virNetlinkGetNeighbor(void **nlData G_GNUC_UNUSED, uint32_t src_pid G_GNUC_UNUSED, diff --git a/src/util/virnetlink.h b/src/util/virnetlink.h index 327fb426a1..74d4f5b613 100644 --- a/src/util/virnetlink.h +++ b/src/util/virnetlink.h @@ -78,11 +78,14 @@ typedef int (*virNetlinkTalkFallback)(const char *ifname); int virNetlinkDelLink(const char *ifname, virNetlinkTalkFallback fallback); int virNetlinkBridgeVlanFilterSet(const char *ifname, - int cmd, const unsigned short flags, const short vid, int *error); +int virNetlinkBridgeVlanFilterDel(const char *ifname, + const short vid, + int *error); + int virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen); int virNetlinkDumpLink(const char *ifname, int ifindex, -- 2.49.0