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util: new files virnetdevip.[ch] for IP-related netdev functions

Browse Source 
This patch splits virnetdev.[ch] into multiple files, with the new
virnetdevip.[ch] containing all the functions related to setting and
retrieving IP-related info for a device (both addresses and routes).
This commit is contained in:
Laine Stump 2016-06-13 17:01:27 -04:00
parent 9658e70f7d
commit cf0568b0af
8 changed files with 853 additions and 730 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
po/POTFILES.in
View File

@ -213,6 +213,7 @@ src/util/virlog.c
src/util/virnetdev.c
src/util/virnetdevbandwidth.c
src/util/virnetdevbridge.c
src/util/virnetdevip.c
src/util/virnetdevmacvlan.c
src/util/virnetdevmidonet.c
src/util/virnetdevopenvswitch.c

1
src/Makefile.am
View File

@ -138,6 +138,7 @@ UTIL_SOURCES = \
util/virnetdev.h util/virnetdev.c \
util/virnetdevbandwidth.h util/virnetdevbandwidth.c \
util/virnetdevbridge.h util/virnetdevbridge.c \
util/virnetdevip.h util/virnetdevip.c \
util/virnetdevmacvlan.c util/virnetdevmacvlan.h \
util/virnetdevmidonet.h util/virnetdevmidonet.c \
util/virnetdevopenvswitch.h util/virnetdevopenvswitch.c \

13
src/libvirt_private.syms
View File

@ -1856,15 +1856,12 @@ virMacAddrSetRaw;
# util/virnetdev.h
virNetDevAddMulti;
virNetDevAddRoute;
virNetDevClearIPAddress;
virNetDevDelMulti;
virNetDevExists;
virNetDevFeatureTypeFromString;
virNetDevFeatureTypeToString;
virNetDevGetFeatures;
virNetDevGetIndex;
virNetDevGetIPAddress;
virNetDevGetLinkInfo;
virNetDevGetMAC;
virNetDevGetMTU;
@ -1890,7 +1887,6 @@ virNetDevRxFilterFree;
virNetDevRxFilterModeTypeFromString;
virNetDevRxFilterModeTypeToString;
virNetDevRxFilterNew;
virNetDevSetIPAddress;
virNetDevSetMAC;
virNetDevSetMTU;
virNetDevSetMTUFromDevice;
@ -1903,7 +1899,6 @@ virNetDevSetRcvMulti;
virNetDevSetupControl;
virNetDevSysfsFile;
virNetDevValidateConfig;
virNetDevWaitDadFinish;
# util/virnetdevbandwidth.h
@ -1937,6 +1932,14 @@ virNetDevBridgeSetSTPDelay;
virNetDevBridgeSetVlanFiltering;
# util/virnetdevip.h
virNetDevIPAddrAdd;
virNetDevIPAddrDel;
virNetDevIPAddrGet;
virNetDevIPRouteAdd;
virNetDevIPWaitDadFinish;
# util/virnetdevmacvlan.h
virNetDevMacVLanCreate;
virNetDevMacVLanCreateWithVPortProfile;

14
src/lxc/lxc_container.c
View File

@ -66,7 +66,7 @@
#include "virfile.h"
#include "virusb.h"
#include "vircommand.h"
#include "virnetdev.h"
#include "virnetdevip.h"
#include "virprocess.h"
#include "virstring.h"
@ -528,7 +528,7 @@ static int lxcContainerRenameAndEnableInterfaces(virDomainDefPtr vmDef,
VIR_DEBUG("Adding IP address '%s/%d' to '%s'",
ipStr, prefix, newname);
if (virNetDevSetIPAddress(newname, &ip->address, NULL, prefix) < 0) {
if (virNetDevIPAddrAdd(newname, &ip->address, NULL, prefix) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Failed to set IP address '%s' on %s"),
ipStr, newname);
@ -549,11 +549,11 @@ static int lxcContainerRenameAndEnableInterfaces(virDomainDefPtr vmDef,
for (j = 0; j < netDef->nroutes; j++) {
virNetworkRouteDefPtr route = netDef->routes[j];
if (virNetDevAddRoute(newname,
virNetworkRouteDefGetAddress(route),
virNetworkRouteDefGetPrefix(route),
virNetworkRouteDefGetGateway(route),
virNetworkRouteDefGetMetric(route)) < 0) {
if (virNetDevIPRouteAdd(newname,
virNetworkRouteDefGetAddress(route),
virNetworkRouteDefGetPrefix(route),
virNetworkRouteDefGetGateway(route),
virNetworkRouteDefGetMetric(route)) < 0) {
goto error_out;
}
VIR_FREE(toStr);

15
src/network/bridge_driver.c
View File

@ -62,10 +62,11 @@
#include "virdnsmasq.h"
#include "configmake.h"
#include "virnetdev.h"
#include "virpci.h"
#include "virnetdevip.h"
#include "virnetdevbridge.h"
#include "virnetdevtap.h"
#include "virnetdevvportprofile.h"
#include "virpci.h"
#include "virdbus.h"
#include "virfile.h"
#include "virstring.h"
@ -1977,8 +1978,8 @@ networkAddAddrToBridge(virNetworkObjPtr network,
return -1;
}
if (virNetDevSetIPAddress(network->def->bridge,
&ipdef->address, NULL, prefix) < 0)
if (virNetDevIPAddrAdd(network->def->bridge,
&ipdef->address, NULL, prefix) < 0)
return -1;
return 0;
@ -2025,8 +2026,8 @@ networkAddRouteToBridge(virNetworkObjPtr network,
return -1;
}
if (virNetDevAddRoute(network->def->bridge, addr,
prefix, gateway, metric) < 0) {
if (virNetDevIPRouteAdd(network->def->bridge, addr,
prefix, gateway, metric) < 0) {
return -1;
}
return 0;
@ -2049,7 +2050,7 @@ networkWaitDadFinish(virNetworkObjPtr network)
goto cleanup;
}
ret = (naddrs == 0) ? 0 : virNetDevWaitDadFinish(addrs, naddrs);
ret = (naddrs == 0) ? 0 : virNetDevIPWaitDadFinish(addrs, naddrs);
cleanup:
VIR_FREE(addrs);
@ -4760,7 +4761,7 @@ networkGetNetworkAddress(const char *netname, char **netaddr)
}
if (dev_name) {
if (virNetDevGetIPAddress(dev_name, &addr) < 0)
if (virNetDevIPAddrGet(dev_name, &addr) < 0)
goto cleanup;
addrptr = &addr;
}

711
src/util/virnetdev.c
View File

@ -34,10 +34,6 @@
#include "virstring.h"
#include "virutil.h"
#if HAVE_GETIFADDRS
# include <ifaddrs.h>
#endif
#include <sys/ioctl.h>
#include <net/if.h>
#include <fcntl.h>
@ -97,7 +93,6 @@ VIR_LOG_INIT("util.netdev");
# define FEATURE_BIT_IS_SET(blocks, index, field) \
(FEATURE_WORD(blocks, index, field) & FEATURE_FIELD_FLAG(index))
#endif
#define VIR_DAD_WAIT_TIMEOUT 20 /* seconds */
typedef enum {
VIR_MCAST_TYPE_INDEX_TOKEN,
@ -1012,712 +1007,6 @@ int virNetDevGetVLanID(const char *ifname ATTRIBUTE_UNUSED,
#endif /* ! SIOCGIFVLAN */
#if defined(__linux__) && defined(HAVE_LIBNL)
static int
virNetDevGetIPAddressBinary(virSocketAddr *addr, void **data, size_t *len)
{
if (!addr)
return -1;
switch (VIR_SOCKET_ADDR_FAMILY(addr)) {
case AF_INET:
*data = &addr->data.inet4.sin_addr;
*len = sizeof(struct in_addr);
break;
case AF_INET6:
*data = &addr->data.inet6.sin6_addr;
*len = sizeof(struct in6_addr);
break;
default:
return -1;
}
return 0;
}
static struct nl_msg *
virNetDevCreateNetlinkAddressMessage(int messageType,
const char *ifname,
virSocketAddr *addr,
unsigned int prefix,
virSocketAddr *broadcast,
virSocketAddr *peer)
{
struct nl_msg *nlmsg = NULL;
struct ifaddrmsg ifa;
unsigned int ifindex;
void *addrData = NULL;
void *peerData = NULL;
void *broadcastData = NULL;
size_t addrDataLen;
if (virNetDevGetIPAddressBinary(addr, &addrData, &addrDataLen) < 0)
return NULL;
if (peer && VIR_SOCKET_ADDR_VALID(peer)) {
if (virNetDevGetIPAddressBinary(peer, &peerData, &addrDataLen) < 0)
return NULL;
} else if (broadcast) {
if (virNetDevGetIPAddressBinary(broadcast, &broadcastData,
&addrDataLen) < 0)
return NULL;
}
/* Get the interface index */
if ((ifindex = if_nametoindex(ifname)) == 0)
return NULL;
if (!(nlmsg = nlmsg_alloc_simple(messageType,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL))) {
virReportOOMError();
return NULL;
}
memset(&ifa, 0, sizeof(ifa));
ifa.ifa_prefixlen = prefix;
ifa.ifa_family = VIR_SOCKET_ADDR_FAMILY(addr);
ifa.ifa_index = ifindex;
ifa.ifa_scope = 0;
if (nlmsg_append(nlmsg, &ifa, sizeof(ifa), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put(nlmsg, IFA_LOCAL, addrDataLen, addrData) < 0)
goto buffer_too_small;
if (peerData) {
if (nla_put(nlmsg, IFA_ADDRESS, addrDataLen, peerData) < 0)
goto buffer_too_small;
}
if (broadcastData) {
if (nla_put(nlmsg, IFA_BROADCAST, addrDataLen, broadcastData) < 0)
goto buffer_too_small;
}
return nlmsg;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
nlmsg_free(nlmsg);
return NULL;
}
/**
* virNetDevSetIPAddress:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @peer: The IP address of peer (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Add an IP address to an interface. This function *does not* remove
* any previously added IP addresses - that must be done separately with
* brDelInetAddress.
*
* Returns 0 in case of success or -1 in case of error.
*/
int virNetDevSetIPAddress(const char *ifname,
virSocketAddr *addr,
virSocketAddr *peer,
unsigned int prefix)
{
virSocketAddr *broadcast = NULL;
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
/* The caller needs to provide a correct address */
if (VIR_SOCKET_ADDR_FAMILY(addr) == AF_INET &&
!(peer && VIR_SOCKET_ADDR_VALID(peer))) {
/* compute a broadcast address if this is IPv4 */
if (VIR_ALLOC(broadcast) < 0)
return -1;
if (virSocketAddrBroadcastByPrefix(addr, prefix, broadcast) < 0)
goto cleanup;
}
if (!(nlmsg = virNetDevCreateNetlinkAddressMessage(RTM_NEWADDR, ifname,
addr, prefix,
broadcast, peer)))
goto cleanup;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Error adding IP address to %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
nlmsg_free(nlmsg);
VIR_FREE(resp);
VIR_FREE(broadcast);
return ret;
}
/**
* virNetDevAddRoute:
* @ifname: the interface name
* @addr: the IP network address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
* @gateway: via address for route (same as @addr)
*
* Add a route for a network IP address to an interface. This function
* *does not* remove any previously added IP static routes.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
virNetDevAddRoute(const char *ifname,
virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr gateway,
unsigned int metric)
{
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
unsigned int ifindex;
struct rtmsg rtmsg;
void *gatewayData = NULL;
void *addrData = NULL;
size_t addrDataLen;
int errCode;
virSocketAddr defaultAddr;
virSocketAddrPtr actualAddr;
char *toStr = NULL;
char *viaStr = NULL;
actualAddr = addr;
/* If we have no valid network address, then use the default one */
if (!addr || !VIR_SOCKET_ADDR_VALID(addr)) {
VIR_DEBUG("computing default address");
int family = VIR_SOCKET_ADDR_FAMILY(gateway);
if (family == AF_INET) {
if (virSocketAddrParseIPv4(&defaultAddr, VIR_SOCKET_ADDR_IPV4_ALL) < 0)
goto cleanup;
} else {
if (virSocketAddrParseIPv6(&defaultAddr, VIR_SOCKET_ADDR_IPV6_ALL) < 0)
goto cleanup;
}
actualAddr = &defaultAddr;
}
toStr = virSocketAddrFormat(actualAddr);
viaStr = virSocketAddrFormat(gateway);
VIR_DEBUG("Adding route %s/%d via %s", toStr, prefix, viaStr);
if (virNetDevGetIPAddressBinary(actualAddr, &addrData, &addrDataLen) < 0 ||
virNetDevGetIPAddressBinary(gateway, &gatewayData, &addrDataLen) < 0)
goto cleanup;
/* Get the interface index */
if ((ifindex = if_nametoindex(ifname)) == 0)
goto cleanup;
if (!(nlmsg = nlmsg_alloc_simple(RTM_NEWROUTE,
NLM_F_REQUEST | NLM_F_CREATE |
NLM_F_EXCL))) {
virReportOOMError();
goto cleanup;
}
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.rtm_family = VIR_SOCKET_ADDR_FAMILY(gateway);
rtmsg.rtm_table = RT_TABLE_MAIN;
rtmsg.rtm_scope = RT_SCOPE_UNIVERSE;
rtmsg.rtm_protocol = RTPROT_BOOT;
rtmsg.rtm_type = RTN_UNICAST;
rtmsg.rtm_dst_len = prefix;
if (nlmsg_append(nlmsg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (prefix > 0 && nla_put(nlmsg, RTA_DST, addrDataLen, addrData) < 0)
goto buffer_too_small;
if (nla_put(nlmsg, RTA_GATEWAY, addrDataLen, gatewayData) < 0)
goto buffer_too_small;
if (nla_put_u32(nlmsg, RTA_OIF, ifindex) < 0)
goto buffer_too_small;
if (metric > 0 && nla_put_u32(nlmsg, RTA_PRIORITY, metric) < 0)
goto buffer_too_small;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if ((errCode = virNetlinkGetErrorCode(resp, recvbuflen)) < 0) {
virReportSystemError(errCode, _("Error adding route to %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(toStr);
VIR_FREE(viaStr);
nlmsg_free(nlmsg);
return ret;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
/**
* virNetDevClearIPAddress:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Delete an IP address from an interface.
*
* Returns 0 in case of success or -1 in case of error.
*/
int virNetDevClearIPAddress(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
if (!(nlmsg = virNetDevCreateNetlinkAddressMessage(RTM_DELADDR, ifname,
addr, prefix,
NULL, NULL)))
goto cleanup;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Error removing IP address from %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
nlmsg_free(nlmsg);
VIR_FREE(resp);
return ret;
}
/* return true if there is a known address with 'tentative' flag set */
static bool
virNetDevParseDadStatus(struct nlmsghdr *nlh, int len,
virSocketAddrPtr *addrs, size_t count)
{
struct ifaddrmsg *ifaddrmsg_ptr;
unsigned int ifaddrmsg_len;
struct rtattr *rtattr_ptr;
size_t i;
struct in6_addr *addr;
VIR_WARNINGS_NO_CAST_ALIGN
for (; NLMSG_OK(nlh, len); nlh = NLMSG_NEXT(nlh, len)) {
VIR_WARNINGS_RESET
if (NLMSG_PAYLOAD(nlh, 0) < sizeof(struct ifaddrmsg)) {
/* Message without payload is the last one. */
break;
}
ifaddrmsg_ptr = (struct ifaddrmsg *)NLMSG_DATA(nlh);
if (!(ifaddrmsg_ptr->ifa_flags & IFA_F_TENTATIVE)) {
/* Not tentative: we are not interested in this entry. */
continue;
}
ifaddrmsg_len = IFA_PAYLOAD(nlh);
VIR_WARNINGS_NO_CAST_ALIGN
rtattr_ptr = (struct rtattr *) IFA_RTA(ifaddrmsg_ptr);
for (; RTA_OK(rtattr_ptr, ifaddrmsg_len);
rtattr_ptr = RTA_NEXT(rtattr_ptr, ifaddrmsg_len)) {
VIR_WARNINGS_RESET
if (RTA_PAYLOAD(rtattr_ptr) != sizeof(struct in6_addr)) {
/* No address: ignore. */
continue;
}
/* We check only known addresses. */
for (i = 0; i < count; i++) {
addr = &addrs[i]->data.inet6.sin6_addr;
if (!memcmp(addr, RTA_DATA(rtattr_ptr),
sizeof(struct in6_addr))) {
/* We found matching tentative address. */
return true;
}
}
}
}
return false;
}
/* return after DAD finishes for all known IPv6 addresses or an error */
int
virNetDevWaitDadFinish(virSocketAddrPtr *addrs, size_t count)
{
struct nl_msg *nlmsg = NULL;
struct ifaddrmsg ifa;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
int ret = -1;
bool dad = true;
time_t max_time = time(NULL) + VIR_DAD_WAIT_TIMEOUT;
if (!(nlmsg = nlmsg_alloc_simple(RTM_GETADDR,
NLM_F_REQUEST | NLM_F_DUMP))) {
virReportOOMError();
return -1;
}
memset(&ifa, 0, sizeof(ifa));
/* DAD is for IPv6 adresses only. */
ifa.ifa_family = AF_INET6;
if (nlmsg_append(nlmsg, &ifa, sizeof(ifa), NLMSG_ALIGNTO) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
/* Periodically query netlink until DAD finishes on all known addresses. */
while (dad && time(NULL) < max_time) {
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
_("error reading DAD state information"));
goto cleanup;
}
/* Parse response. */
dad = virNetDevParseDadStatus(resp, recvbuflen, addrs, count);
if (dad)
usleep(1000 * 10);
VIR_FREE(resp);
}
/* Check timeout. */
if (dad) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Duplicate Address Detection "
"not finished in %d seconds"), VIR_DAD_WAIT_TIMEOUT);
} else {
ret = 0;
}
cleanup:
VIR_FREE(resp);
nlmsg_free(nlmsg);
return ret;
}
#else /* defined(__linux__) && defined(HAVE_LIBNL) */
int virNetDevSetIPAddress(const char *ifname,
virSocketAddr *addr,
virSocketAddr *peer,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr = NULL, *bcaststr = NULL, *peerstr = NULL;
virSocketAddr broadcast;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
if (peer && VIR_SOCKET_ADDR_VALID(peer) && !(peerstr = virSocketAddrFormat(peer)))
goto cleanup;
/* format up a broadcast address if this is IPv4 */
if (!peerstr && ((VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET)) &&
((virSocketAddrBroadcastByPrefix(addr, prefix, &broadcast) < 0) ||
!(bcaststr = virSocketAddrFormat(&broadcast))))) {
goto cleanup;
}
# ifdef IFCONFIG_PATH
cmd = virCommandNew(IFCONFIG_PATH);
virCommandAddArg(cmd, ifname);
if (VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))
virCommandAddArg(cmd, "inet6");
else
virCommandAddArg(cmd, "inet");
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
if (peerstr)
virCommandAddArgList(cmd, "pointopoint", peerstr, NULL);
if (bcaststr)
virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
virCommandAddArg(cmd, "alias");
# else
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "add", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
if (peerstr)
virCommandAddArgList(cmd, "peer", peerstr, NULL);
if (bcaststr)
virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
virCommandAddArgList(cmd, "dev", ifname, NULL);
# endif
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
VIR_FREE(bcaststr);
VIR_FREE(peerstr);
virCommandFree(cmd);
return ret;
}
int
virNetDevAddRoute(const char *ifname,
virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr gateway,
unsigned int metric)
{
virCommandPtr cmd = NULL;
char *addrstr = NULL, *gatewaystr = NULL;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
if (!(gatewaystr = virSocketAddrFormat(gateway)))
goto cleanup;
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "route", "add", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArgList(cmd, "via", gatewaystr, "dev", ifname,
"proto", "static", "metric", NULL);
virCommandAddArgFormat(cmd, "%u", metric);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
VIR_FREE(gatewaystr);
virCommandFree(cmd);
return ret;
}
int virNetDevClearIPAddress(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
# ifdef IFCONFIG_PATH
cmd = virCommandNew(IFCONFIG_PATH);
virCommandAddArg(cmd, ifname);
if (VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))
virCommandAddArg(cmd, "inet6");
else
virCommandAddArg(cmd, "inet");
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArg(cmd, "-alias");
# else
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "del", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArgList(cmd, "dev", ifname, NULL);
# endif
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
virCommandFree(cmd);
return ret;
}
/* return after DAD finishes for all known IPv6 addresses or an error */
int
virNetDevWaitDadFinish(virSocketAddrPtr *addrs ATTRIBUTE_UNUSED,
size_t count ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to wait for IPv6 DAD on this platform"));
return -1;
}
#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
/**
* virNetDevGetIPv4AddressIoctl:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IPv4 address
*
* This function gets the IPv4 address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -errno on failure.
*/
#if defined(SIOCGIFADDR) && defined(HAVE_STRUCT_IFREQ)
static int
virNetDevGetIPv4AddressIoctl(const char *ifname,
virSocketAddrPtr addr)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
virReportSystemError(errno,
_("Unable to get IPv4 address for interface %s via ioctl"),
ifname);
goto cleanup;
}
addr->data.stor.ss_family = AF_INET;
addr->len = sizeof(addr->data.inet4);
memcpy(&addr->data.inet4, &ifr.ifr_addr, addr->len);
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else /* ! SIOCGIFADDR */
static int
virNetDevGetIPv4AddressIoctl(const char *ifname ATTRIBUTE_UNUSED,
virSocketAddrPtr addr ATTRIBUTE_UNUSED)
{
return -2;
}
#endif /* ! SIOCGIFADDR */
/**
* virNetDevGetifaddrsAddress:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IP address
*
* This function gets the IP address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -1 on failure, -2 on unsupported.
*/
#if HAVE_GETIFADDRS
static int
virNetDevGetifaddrsAddress(const char *ifname,
virSocketAddrPtr addr)
{
struct ifaddrs *ifap, *ifa;
int ret = -1;
if (getifaddrs(&ifap) < 0) {
virReportSystemError(errno,
_("Could not get interface list for '%s'"),
ifname);
return -1;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
int family = ifa->ifa_addr->sa_family;
if (STRNEQ_NULLABLE(ifa->ifa_name, ifname))
continue;
if (family != AF_INET6 && family != AF_INET)
continue;
if (family == AF_INET6) {
addr->len = sizeof(addr->data.inet6);
memcpy(&addr->data.inet6, ifa->ifa_addr, addr->len);
} else {
addr->len = sizeof(addr->data.inet4);
memcpy(&addr->data.inet4, ifa->ifa_addr, addr->len);
}
addr->data.stor.ss_family = family;
ret = 0;
goto cleanup;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("no IP address found for interface '%s'"),
ifname);
cleanup:
freeifaddrs(ifap);
return ret;
}
#else /* ! HAVE_GETIFADDRS */
static int
virNetDevGetifaddrsAddress(const char *ifname ATTRIBUTE_UNUSED,
virSocketAddrPtr addr ATTRIBUTE_UNUSED)
{
return -2;
}
#endif
/**
* virNetDevGetIPAddress:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IPv4 address
*
* This function gets the IPv4 address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -errno on failure.
*/
int
virNetDevGetIPAddress(const char *ifname,
virSocketAddrPtr addr)
{
int ret;
memset(addr, 0, sizeof(*addr));
addr->data.stor.ss_family = AF_UNSPEC;
if ((ret = virNetDevGetifaddrsAddress(ifname, addr)) != -2)
return ret;
if ((ret = virNetDevGetIPv4AddressIoctl(ifname, addr)) != -2)
return ret;
virReportSystemError(ENOSYS, "%s",
_("Unable to get IP address on this platform"));
return -1;
}
/**
* virNetDevValidateConfig:
* @ifname: Name of the interface

778
src/util/virnetdevip.c Normal file
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@ -0,0 +1,778 @@
/*
* Copyright (C) 2007-2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virnetdevip.h"
#include "virnetdev.h"
#include "virnetlink.h"
#include "virfile.h"
#include "virerror.h"
#include "viralloc.h"
#include "virlog.h"
#include "virstring.h"
#include "virutil.h"
#if HAVE_GETIFADDRS
# include <ifaddrs.h>
#endif
#include <sys/ioctl.h>
#include <net/if.h>
#include <fcntl.h>
#ifdef __linux__
# include <linux/sockios.h>
# include <linux/if_vlan.h>
# define VIR_NETDEV_FAMILY AF_PACKET
#elif defined(HAVE_STRUCT_IFREQ) && defined(AF_LOCAL)
# define VIR_NETDEV_FAMILY AF_LOCAL
#else
# undef HAVE_STRUCT_IFREQ
#endif
#define VIR_DAD_WAIT_TIMEOUT 20 /* seconds */
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("util.netdevip");
#if defined(__linux__) && defined(HAVE_LIBNL)
static int
virNetDevGetIPAddressBinary(virSocketAddr *addr, void **data, size_t *len)
{
if (!addr)
return -1;
switch (VIR_SOCKET_ADDR_FAMILY(addr)) {
case AF_INET:
*data = &addr->data.inet4.sin_addr;
*len = sizeof(struct in_addr);
break;
case AF_INET6:
*data = &addr->data.inet6.sin6_addr;
*len = sizeof(struct in6_addr);
break;
default:
return -1;
}
return 0;
}
static struct nl_msg *
virNetDevCreateNetlinkAddressMessage(int messageType,
const char *ifname,
virSocketAddr *addr,
unsigned int prefix,
virSocketAddr *broadcast,
virSocketAddr *peer)
{
struct nl_msg *nlmsg = NULL;
struct ifaddrmsg ifa;
unsigned int ifindex;
void *addrData = NULL;
void *peerData = NULL;
void *broadcastData = NULL;
size_t addrDataLen;
if (virNetDevGetIPAddressBinary(addr, &addrData, &addrDataLen) < 0)
return NULL;
if (peer && VIR_SOCKET_ADDR_VALID(peer)) {
if (virNetDevGetIPAddressBinary(peer, &peerData, &addrDataLen) < 0)
return NULL;
} else if (broadcast) {
if (virNetDevGetIPAddressBinary(broadcast, &broadcastData,
&addrDataLen) < 0)
return NULL;
}
/* Get the interface index */
if ((ifindex = if_nametoindex(ifname)) == 0)
return NULL;
if (!(nlmsg = nlmsg_alloc_simple(messageType,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL))) {
virReportOOMError();
return NULL;
}
memset(&ifa, 0, sizeof(ifa));
ifa.ifa_prefixlen = prefix;
ifa.ifa_family = VIR_SOCKET_ADDR_FAMILY(addr);
ifa.ifa_index = ifindex;
ifa.ifa_scope = 0;
if (nlmsg_append(nlmsg, &ifa, sizeof(ifa), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (nla_put(nlmsg, IFA_LOCAL, addrDataLen, addrData) < 0)
goto buffer_too_small;
if (peerData) {
if (nla_put(nlmsg, IFA_ADDRESS, addrDataLen, peerData) < 0)
goto buffer_too_small;
}
if (broadcastData) {
if (nla_put(nlmsg, IFA_BROADCAST, addrDataLen, broadcastData) < 0)
goto buffer_too_small;
}
return nlmsg;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
nlmsg_free(nlmsg);
return NULL;
}
/**
* virNetDevIPAddrAdd:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @peer: The IP address of peer (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Add an IP address to an interface. This function *does not* remove
* any previously added IP addresses - that must be done separately with
* virNetDevIPAddrClear.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
virNetDevIPAddrAdd(const char *ifname,
virSocketAddr *addr,
virSocketAddr *peer,
unsigned int prefix)
{
virSocketAddr *broadcast = NULL;
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
/* The caller needs to provide a correct address */
if (VIR_SOCKET_ADDR_FAMILY(addr) == AF_INET &&
!(peer && VIR_SOCKET_ADDR_VALID(peer))) {
/* compute a broadcast address if this is IPv4 */
if (VIR_ALLOC(broadcast) < 0)
return -1;
if (virSocketAddrBroadcastByPrefix(addr, prefix, broadcast) < 0)
goto cleanup;
}
if (!(nlmsg = virNetDevCreateNetlinkAddressMessage(RTM_NEWADDR, ifname,
addr, prefix,
broadcast, peer)))
goto cleanup;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Error adding IP address to %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
nlmsg_free(nlmsg);
VIR_FREE(resp);
VIR_FREE(broadcast);
return ret;
}
/**
* virNetDevIPAddrDel:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Delete an IP address from an interface.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
virNetDevIPAddrDel(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
if (!(nlmsg = virNetDevCreateNetlinkAddressMessage(RTM_DELADDR, ifname,
addr, prefix,
NULL, NULL)))
goto cleanup;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Error removing IP address from %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
nlmsg_free(nlmsg);
VIR_FREE(resp);
return ret;
}
/**
* virNetDevIPRouteAdd:
* @ifname: the interface name
* @addr: the IP network address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
* @gateway: via address for route (same as @addr)
*
* Add a route for a network IP address to an interface. This function
* *does not* remove any previously added IP static routes.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
virNetDevIPRouteAdd(const char *ifname,
virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr gateway,
unsigned int metric)
{
int ret = -1;
struct nl_msg *nlmsg = NULL;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
unsigned int ifindex;
struct rtmsg rtmsg;
void *gatewayData = NULL;
void *addrData = NULL;
size_t addrDataLen;
int errCode;
virSocketAddr defaultAddr;
virSocketAddrPtr actualAddr;
char *toStr = NULL;
char *viaStr = NULL;
actualAddr = addr;
/* If we have no valid network address, then use the default one */
if (!addr || !VIR_SOCKET_ADDR_VALID(addr)) {
VIR_DEBUG("computing default address");
int family = VIR_SOCKET_ADDR_FAMILY(gateway);
if (family == AF_INET) {
if (virSocketAddrParseIPv4(&defaultAddr, VIR_SOCKET_ADDR_IPV4_ALL) < 0)
goto cleanup;
} else {
if (virSocketAddrParseIPv6(&defaultAddr, VIR_SOCKET_ADDR_IPV6_ALL) < 0)
goto cleanup;
}
actualAddr = &defaultAddr;
}
toStr = virSocketAddrFormat(actualAddr);
viaStr = virSocketAddrFormat(gateway);
VIR_DEBUG("Adding route %s/%d via %s", toStr, prefix, viaStr);
if (virNetDevGetIPAddressBinary(actualAddr, &addrData, &addrDataLen) < 0 ||
virNetDevGetIPAddressBinary(gateway, &gatewayData, &addrDataLen) < 0)
goto cleanup;
/* Get the interface index */
if ((ifindex = if_nametoindex(ifname)) == 0)
goto cleanup;
if (!(nlmsg = nlmsg_alloc_simple(RTM_NEWROUTE,
NLM_F_REQUEST | NLM_F_CREATE |
NLM_F_EXCL))) {
virReportOOMError();
goto cleanup;
}
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.rtm_family = VIR_SOCKET_ADDR_FAMILY(gateway);
rtmsg.rtm_table = RT_TABLE_MAIN;
rtmsg.rtm_scope = RT_SCOPE_UNIVERSE;
rtmsg.rtm_protocol = RTPROT_BOOT;
rtmsg.rtm_type = RTN_UNICAST;
rtmsg.rtm_dst_len = prefix;
if (nlmsg_append(nlmsg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
goto buffer_too_small;
if (prefix > 0 && nla_put(nlmsg, RTA_DST, addrDataLen, addrData) < 0)
goto buffer_too_small;
if (nla_put(nlmsg, RTA_GATEWAY, addrDataLen, gatewayData) < 0)
goto buffer_too_small;
if (nla_put_u32(nlmsg, RTA_OIF, ifindex) < 0)
goto buffer_too_small;
if (metric > 0 && nla_put_u32(nlmsg, RTA_PRIORITY, metric) < 0)
goto buffer_too_small;
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if ((errCode = virNetlinkGetErrorCode(resp, recvbuflen)) < 0) {
virReportSystemError(errCode, _("Error adding route to %s"), ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(toStr);
VIR_FREE(viaStr);
nlmsg_free(nlmsg);
return ret;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
/* return true if there is a known address with 'tentative' flag set */
static bool
virNetDevIPParseDadStatus(struct nlmsghdr *nlh, int len,
virSocketAddrPtr *addrs, size_t count)
{
struct ifaddrmsg *ifaddrmsg_ptr;
unsigned int ifaddrmsg_len;
struct rtattr *rtattr_ptr;
size_t i;
struct in6_addr *addr;
VIR_WARNINGS_NO_CAST_ALIGN
for (; NLMSG_OK(nlh, len); nlh = NLMSG_NEXT(nlh, len)) {
VIR_WARNINGS_RESET
if (NLMSG_PAYLOAD(nlh, 0) < sizeof(struct ifaddrmsg)) {
/* Message without payload is the last one. */
break;
}
ifaddrmsg_ptr = (struct ifaddrmsg *)NLMSG_DATA(nlh);
if (!(ifaddrmsg_ptr->ifa_flags & IFA_F_TENTATIVE)) {
/* Not tentative: we are not interested in this entry. */
continue;
}
ifaddrmsg_len = IFA_PAYLOAD(nlh);
VIR_WARNINGS_NO_CAST_ALIGN
rtattr_ptr = (struct rtattr *) IFA_RTA(ifaddrmsg_ptr);
for (; RTA_OK(rtattr_ptr, ifaddrmsg_len);
rtattr_ptr = RTA_NEXT(rtattr_ptr, ifaddrmsg_len)) {
VIR_WARNINGS_RESET
if (RTA_PAYLOAD(rtattr_ptr) != sizeof(struct in6_addr)) {
/* No address: ignore. */
continue;
}
/* We check only known addresses. */
for (i = 0; i < count; i++) {
addr = &addrs[i]->data.inet6.sin6_addr;
if (!memcmp(addr, RTA_DATA(rtattr_ptr),
sizeof(struct in6_addr))) {
/* We found matching tentative address. */
return true;
}
}
}
}
return false;
}
/* return after DAD finishes for all known IPv6 addresses or an error */
int
virNetDevIPWaitDadFinish(virSocketAddrPtr *addrs, size_t count)
{
struct nl_msg *nlmsg = NULL;
struct ifaddrmsg ifa;
struct nlmsghdr *resp = NULL;
unsigned int recvbuflen;
int ret = -1;
bool dad = true;
time_t max_time = time(NULL) + VIR_DAD_WAIT_TIMEOUT;
if (!(nlmsg = nlmsg_alloc_simple(RTM_GETADDR,
NLM_F_REQUEST | NLM_F_DUMP))) {
virReportOOMError();
return -1;
}
memset(&ifa, 0, sizeof(ifa));
/* DAD is for IPv6 adresses only. */
ifa.ifa_family = AF_INET6;
if (nlmsg_append(nlmsg, &ifa, sizeof(ifa), NLMSG_ALIGNTO) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
goto cleanup;
}
/* Periodically query netlink until DAD finishes on all known addresses. */
while (dad && time(NULL) < max_time) {
if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0)
goto cleanup;
if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
_("error reading DAD state information"));
goto cleanup;
}
/* Parse response. */
dad = virNetDevIPParseDadStatus(resp, recvbuflen, addrs, count);
if (dad)
usleep(1000 * 10);
VIR_FREE(resp);
}
/* Check timeout. */
if (dad) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Duplicate Address Detection "
"not finished in %d seconds"), VIR_DAD_WAIT_TIMEOUT);
} else {
ret = 0;
}
cleanup:
VIR_FREE(resp);
nlmsg_free(nlmsg);
return ret;
}
#else /* defined(__linux__) && defined(HAVE_LIBNL) */
int
virNetDevIPAddrAdd(const char *ifname,
virSocketAddr *addr,
virSocketAddr *peer,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr = NULL, *bcaststr = NULL, *peerstr = NULL;
virSocketAddr broadcast;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
if (peer && VIR_SOCKET_ADDR_VALID(peer) && !(peerstr = virSocketAddrFormat(peer)))
goto cleanup;
/* format up a broadcast address if this is IPv4 */
if (!peerstr && ((VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET)) &&
((virSocketAddrBroadcastByPrefix(addr, prefix, &broadcast) < 0) ||
!(bcaststr = virSocketAddrFormat(&broadcast))))) {
goto cleanup;
}
# ifdef IFCONFIG_PATH
cmd = virCommandNew(IFCONFIG_PATH);
virCommandAddArg(cmd, ifname);
if (VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))
virCommandAddArg(cmd, "inet6");
else
virCommandAddArg(cmd, "inet");
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
if (peerstr)
virCommandAddArgList(cmd, "pointopoint", peerstr, NULL);
if (bcaststr)
virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
virCommandAddArg(cmd, "alias");
# else
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "add", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
if (peerstr)
virCommandAddArgList(cmd, "peer", peerstr, NULL);
if (bcaststr)
virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
virCommandAddArgList(cmd, "dev", ifname, NULL);
# endif
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
VIR_FREE(bcaststr);
VIR_FREE(peerstr);
virCommandFree(cmd);
return ret;
}
int
virNetDevIPAddrDel(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
# ifdef IFCONFIG_PATH
cmd = virCommandNew(IFCONFIG_PATH);
virCommandAddArg(cmd, ifname);
if (VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))
virCommandAddArg(cmd, "inet6");
else
virCommandAddArg(cmd, "inet");
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArg(cmd, "-alias");
# else
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "del", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArgList(cmd, "dev", ifname, NULL);
# endif
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
virCommandFree(cmd);
return ret;
}
int
virNetDevIPRouteAdd(const char *ifname,
virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr gateway,
unsigned int metric)
{
virCommandPtr cmd = NULL;
char *addrstr = NULL, *gatewaystr = NULL;
int ret = -1;
if (!(addrstr = virSocketAddrFormat(addr)))
goto cleanup;
if (!(gatewaystr = virSocketAddrFormat(gateway)))
goto cleanup;
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "route", "add", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArgList(cmd, "via", gatewaystr, "dev", ifname,
"proto", "static", "metric", NULL);
virCommandAddArgFormat(cmd, "%u", metric);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
VIR_FREE(gatewaystr);
virCommandFree(cmd);
return ret;
}
/* return after DAD finishes for all known IPv6 addresses or an error */
int
virNetDevWaitDadFinish(virSocketAddrPtr *addrs ATTRIBUTE_UNUSED,
size_t count ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to wait for IPv6 DAD on this platform"));
return -1;
}
#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
/**
* virNetDevGetIPv4AddressIoctl:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IPv4 address
*
* This function gets the IPv4 address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -errno on failure.
*/
#if defined(SIOCGIFADDR) && defined(HAVE_STRUCT_IFREQ)
static int
virNetDevGetIPv4AddressIoctl(const char *ifname,
virSocketAddrPtr addr)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
virReportSystemError(errno,
_("Unable to get IPv4 address for interface %s via ioctl"),
ifname);
goto cleanup;
}
addr->data.stor.ss_family = AF_INET;
addr->len = sizeof(addr->data.inet4);
memcpy(&addr->data.inet4, &ifr.ifr_addr, addr->len);
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else /* ! SIOCGIFADDR */
static int
virNetDevGetIPv4AddressIoctl(const char *ifname ATTRIBUTE_UNUSED,
virSocketAddrPtr addr ATTRIBUTE_UNUSED)
{
return -2;
}
#endif /* ! SIOCGIFADDR */
/**
* virNetDevGetifaddrsAddress:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IP address
*
* This function gets the IP address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -1 on failure, -2 on unsupported.
*/
#if HAVE_GETIFADDRS
static int
virNetDevGetifaddrsAddress(const char *ifname,
virSocketAddrPtr addr)
{
struct ifaddrs *ifap, *ifa;
int ret = -1;
if (getifaddrs(&ifap) < 0) {
virReportSystemError(errno,
_("Could not get interface list for '%s'"),
ifname);
return -1;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
int family = ifa->ifa_addr->sa_family;
if (STRNEQ_NULLABLE(ifa->ifa_name, ifname))
continue;
if (family != AF_INET6 && family != AF_INET)
continue;
if (family == AF_INET6) {
addr->len = sizeof(addr->data.inet6);
memcpy(&addr->data.inet6, ifa->ifa_addr, addr->len);
} else {
addr->len = sizeof(addr->data.inet4);
memcpy(&addr->data.inet4, ifa->ifa_addr, addr->len);
}
addr->data.stor.ss_family = family;
ret = 0;
goto cleanup;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("no IP address found for interface '%s'"),
ifname);
cleanup:
freeifaddrs(ifap);
return ret;
}
#else /* ! HAVE_GETIFADDRS */
static int
virNetDevGetifaddrsAddress(const char *ifname ATTRIBUTE_UNUSED,
virSocketAddrPtr addr ATTRIBUTE_UNUSED)
{
return -2;
}
#endif
/**
* virNetDevIPIPAddrGet:
* @ifname: name of the interface whose IP address we want
* @addr: filled with the IPv4 address
*
* This function gets the IPv4 address for the interface @ifname
* and stores it in @addr
*
* Returns 0 on success, -errno on failure.
*/
int
virNetDevIPAddrGet(const char *ifname,
virSocketAddrPtr addr)
{
int ret;
memset(addr, 0, sizeof(*addr));
addr->data.stor.ss_family = AF_UNSPEC;
if ((ret = virNetDevGetifaddrsAddress(ifname, addr)) != -2)
return ret;
if ((ret = virNetDevGetIPv4AddressIoctl(ifname, addr)) != -2)
return ret;
virReportSystemError(ENOSYS, "%s",
_("Unable to get IP address on this platform"));
return -1;
}

50
src/util/virnetdevip.h Normal file
View File

@ -0,0 +1,50 @@
/*
* Copyright (C) 2007-2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_NETDEVIP_H__
# define __VIR_NETDEVIP_H__
# include "virsocketaddr.h"
/* manipulating/querying the netdev */
int virNetDevIPAddrAdd(const char *ifname,
virSocketAddr *addr,
virSocketAddr *peer,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevIPRouteAdd(const char *ifname,
virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr gateway,
unsigned int metric)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(4)
ATTRIBUTE_RETURN_CHECK;
int virNetDevIPAddrDel(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevIPAddrGet(const char *ifname, virSocketAddrPtr addr)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevIPWaitDadFinish(virSocketAddrPtr *addrs, size_t count)
ATTRIBUTE_NONNULL(1);
#endif /* __VIR_NETDEVIP_H__ */