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Improve netlink to support all protocol.

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This patch improve all the API in virnetlink.c to support
all kinds of netlink protocols, and make all netlink sockets
be able to join in groups.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
This commit is contained in:
Tang Chen 2012-08-22 12:10:23 +08:00 committed by Daniel Veillard
parent 225f280744
commit d575679401
6 changed files with 157 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
daemon/libvirtd.c
View File

@ -1312,8 +1312,8 @@ int main(int argc, char **argv) {
goto cleanup;
}
/* Register the netlink event service */
if (virNetlinkEventServiceStart() < 0) {
/* Register the netlink event service for NETLINK_ROUTE */
if (virNetlinkEventServiceStart(NETLINK_ROUTE, 0) < 0) {
ret = VIR_DAEMON_ERR_NETWORK;
goto cleanup;
}
@ -1327,7 +1327,7 @@ int main(int argc, char **argv) {
0, "shutdown", NULL, NULL);
cleanup:
virNetlinkEventServiceStop();
virNetlinkEventServiceStop(NETLINK_ROUTE);
virObjectUnref(remoteProgram);
virObjectUnref(qemuProgram);
virNetServerClose(srv);

6
src/util/virnetdev.c
View File

@ -1277,7 +1277,8 @@ virNetDevLinkDump(const char *ifname, int ifindex,
goto buffer_too_small;
}
if (virNetlinkCommand(nl_msg, recvbuf, &recvbuflen, src_pid, dst_pid) < 0)
if (virNetlinkCommand(nl_msg, recvbuf, &recvbuflen,
src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (recvbuflen < NLMSG_LENGTH(0) || *recvbuf == NULL)
@ -1405,7 +1406,8 @@ virNetDevSetVfConfig(const char *ifname, int ifindex, int vf,
}
}
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, pid) < 0)
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, pid,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)

12
src/util/virnetdevmacvlan.c
View File

@ -149,7 +149,8 @@ virNetDevMacVLanCreate(const char *ifname,
nla_nest_end(nl_msg, linkinfo);
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, 0) < 0) {
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
goto cleanup;
}
@ -237,7 +238,8 @@ int virNetDevMacVLanDelete(const char *ifname)
if (nla_put(nl_msg, IFLA_IFNAME, strlen(ifname)+1, ifname) < 0)
goto buffer_too_small;
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, 0) < 0) {
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
goto cleanup;
}
@ -757,7 +759,7 @@ virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname,
{
virNetlinkCallbackDataPtr calld = NULL;
if (virtPortProfile && virNetlinkEventServiceIsRunning()) {
if (virtPortProfile && virNetlinkEventServiceIsRunning(NETLINK_ROUTE)) {
if (VIR_ALLOC(calld) < 0)
goto memory_error;
if ((calld->cr_ifname = strdup(ifname)) == NULL)
@ -774,7 +776,7 @@ virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname,
if (virNetlinkEventAddClient(virNetDevMacVLanVPortProfileCallback,
virNetDevMacVLanVPortProfileDestroyCallback,
calld, macaddress) < 0)
calld, macaddress, NETLINK_ROUTE) < 0)
goto error;
}
@ -1000,7 +1002,7 @@ int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname,
ret = -1;
}
virNetlinkEventRemoveClient(0, macaddr);
virNetlinkEventRemoveClient(0, macaddr, NETLINK_ROUTE);
return ret;
}

7
src/util/virnetdevvportprofile.c
View File

@ -705,13 +705,14 @@ virNetDevVPortProfileOpSetLink(const char *ifname, int ifindex,
}
if (!nltarget_kernel) {
if ((src_pid = virNetlinkEventServiceLocalPid()) < 0)
if ((src_pid = virNetlinkEventServiceLocalPid(NETLINK_ROUTE)) < 0)
goto cleanup;
if ((dst_pid = virNetDevVPortProfileGetLldpadPid()) == 0)
goto cleanup;
}
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen, src_pid, dst_pid) < 0)
if (virNetlinkCommand(nl_msg, &recvbuf, &recvbuflen,
src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (recvbuflen < NLMSG_LENGTH(0) || recvbuf == NULL)
@ -868,7 +869,7 @@ virNetDevVPortProfileOpCommon(const char *ifname, int ifindex,
return 0;
if (!nltarget_kernel &&
(((src_pid = virNetlinkEventServiceLocalPid()) < 0) ||
(((src_pid = virNetlinkEventServiceLocalPid(NETLINK_ROUTE)) < 0) ||
((dst_pid = virNetDevVPortProfileGetLldpadPid()) == 0))) {
rc = -1;
goto cleanup;

171
src/util/virnetlink.c
View File

@ -33,6 +33,7 @@
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "virnetlink.h"
#include "logging.h"
@ -41,6 +42,10 @@
#include "virmacaddr.h"
#include "virterror_internal.h"
#ifndef SOL_NETLINK
# define SOL_NETLINK 270
#endif
#define VIR_FROM_THIS VIR_FROM_NET
#define NETLINK_ACK_TIMEOUT_S 2
@ -93,7 +98,9 @@ static int nextWatch = 1;
records in this multiple */
# define NETLINK_EVENT_ALLOC_EXTENT 10
static virNetlinkEventSrvPrivatePtr server = NULL;
/* Linux kernel supports up to MAX_LINKS (32 at the time) individual
* netlink protocols. */
static virNetlinkEventSrvPrivatePtr server[MAX_LINKS] = {NULL};
static virNetlinkHandle *placeholder_nlhandle = NULL;
/* Function definitions */
@ -157,7 +164,10 @@ virNetlinkShutdown(void)
* @respbuf: pointer to pointer where response buffer will be allocated
* @respbuflen: pointer to integer holding the size of the response buffer
* on return of the function.
* @nl_pid: the pid of the process to talk to, i.e., pid = 0 for kernel
* @src_pid: the pid of the process to send a message
* @dst_pid: the pid of the process to talk to, i.e., pid = 0 for kernel
* @protocol: netlink protocol
* @groups: the group identifier
*
* Send the given message to the netlink layer and receive response.
* Returns 0 on success, -1 on error. In case of error, no response
@ -165,7 +175,8 @@ virNetlinkShutdown(void)
*/
int virNetlinkCommand(struct nl_msg *nl_msg,
unsigned char **respbuf, unsigned int *respbuflen,
uint32_t src_pid, uint32_t dst_pid)
uint32_t src_pid, uint32_t dst_pid,
unsigned int protocol, unsigned int groups)
{
int rc = 0;
struct sockaddr_nl nladdr = {
@ -181,17 +192,40 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
int fd;
int n;
struct nlmsghdr *nlmsg = nlmsg_hdr(nl_msg);
virNetlinkHandle *nlhandle = virNetlinkAlloc();
virNetlinkHandle *nlhandle = NULL;
if (protocol >= MAX_LINKS) {
virReportSystemError(EINVAL,
_("invalid protocol argument: %d"), protocol);
return -EINVAL;
}
nlhandle = virNetlinkAlloc();
if (!nlhandle) {
virReportSystemError(errno,
"%s", _("cannot allocate nlhandle for netlink"));
return -1;
}
if (nl_connect(nlhandle, NETLINK_ROUTE) < 0) {
if (nl_connect(nlhandle, protocol) < 0) {
virReportSystemError(errno,
"%s", _("cannot connect to netlink socket"));
_("cannot connect to netlink socket with protocol %d"),
protocol);
rc = -1;
goto error;
}
fd = nl_socket_get_fd(nlhandle);
if (fd < 0) {
virReportSystemError(errno,
"%s", _("cannot get netlink socket fd"));
rc = -1;
goto error;
}
if (groups && nl_socket_add_membership(nlhandle, groups) < 0) {
virReportSystemError(errno,
"%s", _("cannot add netlink membership"));
rc = -1;
goto error;
}
@ -208,8 +242,6 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
goto error;
}
fd = nl_socket_get_fd(nlhandle);
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
@ -258,6 +290,7 @@ virNetlinkEventServerUnlock(virNetlinkEventSrvPrivatePtr driver)
* virNetlinkEventRemoveClientPrimitive:
*
* @i: index of the client to remove from the table
* @protocol: netlink protocol
*
* This static function does the low level removal of a client from
* the table once its index is known, including calling the remove
@ -267,17 +300,21 @@ virNetlinkEventServerUnlock(virNetlinkEventSrvPrivatePtr driver)
*
* assumes success, returns nothing.
*/
static void
virNetlinkEventRemoveClientPrimitive(size_t i)
static int
virNetlinkEventRemoveClientPrimitive(size_t i, unsigned int protocol)
{
virNetlinkEventRemoveCallback removeCB = server->handles[i].removeCB;
if (protocol >= MAX_LINKS)
return -EINVAL;
virNetlinkEventRemoveCallback removeCB = server[protocol]->handles[i].removeCB;
if (removeCB) {
(removeCB)(server->handles[i].watch,
&server->handles[i].macaddr,
server->handles[i].opaque);
(removeCB)(server[protocol]->handles[i].watch,
&server[protocol]->handles[i].macaddr,
server[protocol]->handles[i].opaque);
}
server->handles[i].deleted = VIR_NETLINK_HANDLE_DELETED;
server[protocol]->handles[i].deleted = VIR_NETLINK_HANDLE_DELETED;
return 0;
}
static void
@ -330,17 +367,22 @@ virNetlinkEventCallback(int watch,
* stop the monitor to receive netlink messages for libvirtd.
* This removes the netlink socket fd from the event handler.
*
* @protocol: netlink protocol
*
* Returns -1 if the monitor cannot be unregistered, 0 upon success
*/
int
virNetlinkEventServiceStop(void)
virNetlinkEventServiceStop(unsigned int protocol)
{
virNetlinkEventSrvPrivatePtr srv = server;
if (protocol >= MAX_LINKS)
return -EINVAL;
virNetlinkEventSrvPrivatePtr srv = server[protocol];
int i;
VIR_INFO("stopping netlink event service");
if (!server)
if (!server[protocol])
return 0;
virNetlinkEventServerLock(srv);
@ -351,10 +393,10 @@ virNetlinkEventServiceStop(void)
/* free any remaining clients on the list */
for (i = 0; i < srv->handlesCount; i++) {
if (srv->handles[i].deleted == VIR_NETLINK_HANDLE_VALID)
virNetlinkEventRemoveClientPrimitive(i);
virNetlinkEventRemoveClientPrimitive(i, protocol);
}
server = 0;
server[protocol] = NULL;
virNetlinkEventServerUnlock(srv);
virMutexDestroy(&srv->lock);
@ -367,29 +409,42 @@ virNetlinkEventServiceStop(void)
*
* Returns if the netlink event service is running.
*
* @protocol: netlink protocol
*
* Returns 'true' if the service is running, 'false' if stopped.
*/
bool
virNetlinkEventServiceIsRunning(void)
virNetlinkEventServiceIsRunning(unsigned int protocol)
{
return server != NULL;
if (protocol >= MAX_LINKS) {
virReportSystemError(EINVAL,
_("invalid protocol argument: %d"), protocol);
return false;
}
return server[protocol] != NULL;
}
/**
* virNetlinkEventServiceLocalPid:
*
* @protocol: netlink protocol
*
* Returns the nl_pid value that was used to bind() the netlink socket
* used by the netlink event service, or -1 on error (netlink
* guarantees that this value will always be > 0).
*/
int virNetlinkEventServiceLocalPid(void)
int virNetlinkEventServiceLocalPid(unsigned int protocol)
{
if (!(server && server->netlinknh)) {
if (protocol >= MAX_LINKS)
return -EINVAL;
if (!(server[protocol] && server[protocol]->netlinknh)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("netlink event service not running"));
return -1;
}
return (int)nl_socket_get_local_port(server->netlinknh);
return (int)nl_socket_get_local_port(server[protocol]->netlinknh);
}
@ -399,19 +454,27 @@ int virNetlinkEventServiceLocalPid(void)
* start a monitor to receive netlink messages for libvirtd.
* This registers a netlink socket with the event interface.
*
* @protocol: netlink protocol
* @groups: broadcast groups to join in
* Returns -1 if the monitor cannot be registered, 0 upon success
*/
int
virNetlinkEventServiceStart(void)
virNetlinkEventServiceStart(unsigned int protocol, unsigned int groups)
{
virNetlinkEventSrvPrivatePtr srv;
int fd;
int ret = -1;
if (server)
if (protocol >= MAX_LINKS) {
virReportSystemError(EINVAL,
_("invalid protocol argument: %d"), protocol);
return -EINVAL;
}
if (server[protocol])
return 0;
VIR_INFO("starting netlink event service");
VIR_INFO("starting netlink event service with protocol %d", protocol);
if (VIR_ALLOC(srv) < 0) {
virReportOOMError();
@ -434,20 +497,25 @@ virNetlinkEventServiceStart(void)
goto error_locked;
}
if (nl_connect(srv->netlinknh, NETLINK_ROUTE) < 0) {
if (nl_connect(srv->netlinknh, protocol) < 0) {
virReportSystemError(errno,
"%s", _("cannot connect to netlink socket"));
_("cannot connect to netlink socket with protocol %d"), protocol);
goto error_server;
}
fd = nl_socket_get_fd(srv->netlinknh);
if (fd < 0) {
virReportSystemError(errno,
"%s", _("cannot get netlink socket fd"));
goto error_server;
}
if (groups && nl_socket_add_membership(srv->netlinknh, groups) < 0) {
virReportSystemError(errno,
"%s", _("cannot add netlink membership"));
goto error_server;
}
if (nl_socket_set_nonblocking(srv->netlinknh)) {
virReportSystemError(errno, "%s",
_("cannot set netlink socket nonblocking"));
@ -467,7 +535,7 @@ virNetlinkEventServiceStart(void)
VIR_DEBUG("netlink event listener on fd: %i running", fd);
ret = 0;
server = srv;
server[protocol] = srv;
error_server:
if (ret < 0) {
@ -491,6 +559,7 @@ error_locked:
* @opaque: user data to pass to callback
* @macaddr: macaddr to store with the data. Used to identify callers.
* May be null.
* @protocol: netlink protocol
*
* register a callback for handling of netlink messages. The
* registered function receives the entire netlink message and
@ -502,10 +571,16 @@ error_locked:
int
virNetlinkEventAddClient(virNetlinkEventHandleCallback handleCB,
virNetlinkEventRemoveCallback removeCB,
void *opaque, const virMacAddrPtr macaddr)
void *opaque, const virMacAddrPtr macaddr,
unsigned int protocol)
{
int i, r, ret = -1;
virNetlinkEventSrvPrivatePtr srv = server;
virNetlinkEventSrvPrivatePtr srv = NULL;
if (protocol >= MAX_LINKS)
return -EINVAL;
srv = server[protocol];
if (handleCB == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@ -562,6 +637,7 @@ error:
*
* @watch: watch whose handle to remove
* @macaddr: macaddr whose handle to remove
* @protocol: netlink protocol
*
* Unregister a callback from a netlink monitor.
* The handler function referenced will no longer receive netlink messages.
@ -570,11 +646,17 @@ error:
* Returns -1 if the file handle was not registered, 0 upon success
*/
int
virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr)
virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr,
unsigned int protocol)
{
int i;
int ret = -1;
virNetlinkEventSrvPrivatePtr srv = server;
virNetlinkEventSrvPrivatePtr srv = NULL;
if (protocol >= MAX_LINKS)
return -EINVAL;
srv = server[protocol];
VIR_DEBUG("removing client watch=%d, mac=%p.", watch, macaddr);
@ -595,7 +677,7 @@ virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr)
VIR_DEBUG("removed client: %d by %s.",
srv->handles[i].watch, watch ? "index" : "mac");
virNetlinkEventRemoveClientPrimitive(i);
virNetlinkEventRemoveClientPrimitive(i, protocol);
ret = 0;
goto cleanup;
}
@ -631,7 +713,9 @@ int virNetlinkCommand(struct nl_msg *nl_msg ATTRIBUTE_UNUSED,
unsigned char **respbuf ATTRIBUTE_UNUSED,
unsigned int *respbuflen ATTRIBUTE_UNUSED,
uint32_t src_pid ATTRIBUTE_UNUSED,
uint32_t dst_pid ATTRIBUTE_UNUSED)
uint32_t dst_pid ATTRIBUTE_UNUSED,
unsigned int protocol ATTRIBUTE_UNUSED,
unsigned int groups ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
@ -641,7 +725,7 @@ int virNetlinkCommand(struct nl_msg *nl_msg ATTRIBUTE_UNUSED,
* stopNetlinkEventServer: stop the monitor to receive netlink
* messages for libvirtd
*/
int virNetlinkEventServiceStop(void)
int virNetlinkEventServiceStop(unsigned int protocol ATTRIBUTE_UNUSED)
{
VIR_DEBUG("%s", _(unsupported));
return 0;
@ -651,7 +735,8 @@ int virNetlinkEventServiceStop(void)
* startNetlinkEventServer: start a monitor to receive netlink
* messages for libvirtd
*/
int virNetlinkEventServiceStart(void)
int virNetlinkEventServiceStart(unsigned int protocol ATTRIBUTE_UNUSED,
unsigned int groups ATTRIBUTE_UNUSED)
{
VIR_DEBUG("%s", _(unsupported));
return 0;
@ -661,13 +746,13 @@ int virNetlinkEventServiceStart(void)
* virNetlinkEventServiceIsRunning: returns if the netlink event
* service is running.
*/
bool virNetlinkEventServiceIsRunning(void)
bool virNetlinkEventServiceIsRunning(unsigned int protocol ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return 0;
}
int virNetlinkEventServiceLocalPid(void)
int virNetlinkEventServiceLocalPid(unsigned int protocol ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
@ -681,6 +766,7 @@ int virNetlinkEventAddClient(virNetlinkEventHandleCallback handleCB ATTRIBUTE_UN
virNetlinkEventRemoveCallback removeCB ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED,
const virMacAddrPtr macaddr ATTRIBUTE_UNUSED)
unsigned int protocol ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
@ -691,6 +777,7 @@ int virNetlinkEventAddClient(virNetlinkEventHandleCallback handleCB ATTRIBUTE_UN
*/
int virNetlinkEventRemoveClient(int watch ATTRIBUTE_UNUSED,
const virMacAddrPtr macaddr ATTRIBUTE_UNUSED)
unsigned int protocol ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;

17
src/util/virnetlink.h
View File

@ -41,7 +41,8 @@ void virNetlinkShutdown(void);
int virNetlinkCommand(struct nl_msg *nl_msg,
unsigned char **respbuf, unsigned int *respbuflen,
uint32_t src_port, uint32_t dst_port);
uint32_t src_pid, uint32_t dst_pid,
unsigned int protocol, unsigned int groups);
typedef void (*virNetlinkEventHandleCallback)(unsigned char *msg, int length, struct sockaddr_nl *peer, bool *handled, void *opaque);
@ -50,33 +51,35 @@ typedef void (*virNetlinkEventRemoveCallback)(int watch, const virMacAddrPtr mac
/**
* stopNetlinkEventServer: stop the monitor to receive netlink messages for libvirtd
*/
int virNetlinkEventServiceStop(void);
int virNetlinkEventServiceStop(unsigned int protocol);
/**
* startNetlinkEventServer: start a monitor to receive netlink messages for libvirtd
*/
int virNetlinkEventServiceStart(void);
int virNetlinkEventServiceStart(unsigned int protocol, unsigned int groups);
/**
* virNetlinkEventServiceIsRunning: returns if the netlink event service is running.
*/
bool virNetlinkEventServiceIsRunning(void);
bool virNetlinkEventServiceIsRunning(unsigned int protocol);
/**
* virNetlinkEventServiceLocalPid: returns nl_pid used to bind() netlink socket
*/
int virNetlinkEventServiceLocalPid(void);
int virNetlinkEventServiceLocalPid(unsigned int protocol);
/**
* virNetlinkEventAddClient: register a callback for handling of netlink messages
*/
int virNetlinkEventAddClient(virNetlinkEventHandleCallback handleCB,
virNetlinkEventRemoveCallback removeCB,
void *opaque, const virMacAddrPtr macaddr);
void *opaque, const virMacAddrPtr macaddr,
unsigned int protocol);
/**
* virNetlinkEventRemoveClient: unregister a callback from a netlink monitor
*/
int virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr);
int virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr,
unsigned int protocol);
#endif /* __VIR_NETLINK_H__ */