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https://gitlab.com/libvirt/libvirt.git
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virNetDevSetIPv4Address: libnl implementation
Add a default implementation of virNetDevSetIPv4Address using netlink and libnl. This avoids requiring /usr/sbin/ip or /usr/sbin/ifconfig external binaries.
This commit is contained in:
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b11a75dcb4
commit
4dc04d3ab4
@ -1740,6 +1740,7 @@ virNetlinkEventServiceLocalPid;
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virNetlinkEventServiceStart;
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virNetlinkEventServiceStop;
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virNetlinkEventServiceStopAll;
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virNetlinkGetErrorCode;
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virNetlinkShutdown;
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virNetlinkStartup;
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@ -823,6 +823,88 @@ int virNetDevGetVLanID(const char *ifname ATTRIBUTE_UNUSED,
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#endif /* ! SIOCGIFVLAN */
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#if defined(__linux__) && defined(HAVE_LIBNL)
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static int
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virNetDevGetIPAddressBinary(virSocketAddr *addr, void **data, size_t *len)
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{
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if (!addr)
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return -1;
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switch (VIR_SOCKET_ADDR_FAMILY(addr)) {
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case AF_INET:
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*data = &addr->data.inet4.sin_addr;
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*len = sizeof(struct in_addr);
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break;
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case AF_INET6:
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*data = &addr->data.inet6.sin6_addr;
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*len = sizeof(struct in6_addr);
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break;
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default:
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return -1;
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}
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return 0;
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}
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static struct nl_msg *
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virNetDevCreateNetlinkAddressMessage(int messageType,
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const char *ifname,
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virSocketAddr *addr,
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unsigned int prefix,
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virSocketAddr *broadcast)
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{
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struct nl_msg *nlmsg = NULL;
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struct ifaddrmsg ifa;
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unsigned int ifindex;
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void *addrData = NULL;
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void *broadcastData = NULL;
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size_t addrDataLen;
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if (virNetDevGetIPAddressBinary(addr, &addrData, &addrDataLen) < 0)
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return NULL;
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if (broadcast && virNetDevGetIPAddressBinary(broadcast, &broadcastData,
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&addrDataLen) < 0)
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return NULL;
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/* Get the interface index */
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if ((ifindex = if_nametoindex(ifname)) == 0)
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return NULL;
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if (!(nlmsg = nlmsg_alloc_simple(messageType,
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NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL))) {
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virReportOOMError();
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return NULL;
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}
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memset(&ifa, 0, sizeof(ifa));
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ifa.ifa_prefixlen = prefix;
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ifa.ifa_family = VIR_SOCKET_ADDR_FAMILY(addr);
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ifa.ifa_index = ifindex;
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ifa.ifa_scope = 0;
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if (nlmsg_append(nlmsg, &ifa, sizeof(ifa), NLMSG_ALIGNTO) < 0)
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goto buffer_too_small;
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if (nla_put(nlmsg, IFA_LOCAL, addrDataLen, addrData) < 0)
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goto buffer_too_small;
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if (nla_put(nlmsg, IFA_ADDRESS, addrDataLen, addrData) < 0)
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goto buffer_too_small;
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if (broadcastData &&
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nla_put(nlmsg, IFA_BROADCAST, addrDataLen, broadcastData) < 0)
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goto buffer_too_small;
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return nlmsg;
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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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nlmsg_free(nlmsg);
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return NULL;
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}
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/**
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* virNetDevSetIPv4Address:
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@ -836,6 +918,52 @@ int virNetDevGetVLanID(const char *ifname ATTRIBUTE_UNUSED,
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*
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* Returns 0 in case of success or -1 in case of error.
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*/
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int virNetDevSetIPv4Address(const char *ifname,
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virSocketAddr *addr,
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unsigned int prefix)
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{
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virSocketAddr *broadcast = NULL;
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int ret = -1;
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struct nl_msg *nlmsg = NULL;
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struct nlmsghdr *resp = NULL;
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unsigned int recvbuflen;
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/* The caller needs to provide a correct address */
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if (VIR_SOCKET_ADDR_FAMILY(addr) == AF_INET) {
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/* compute a broadcast address if this is IPv4 */
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if (VIR_ALLOC(broadcast) < 0)
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return -1;
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if (virSocketAddrBroadcastByPrefix(addr, prefix, broadcast) < 0)
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goto cleanup;
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}
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if (!(nlmsg = virNetDevCreateNetlinkAddressMessage(RTM_NEWADDR, ifname,
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addr, prefix,
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broadcast)))
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goto cleanup;
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if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
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NETLINK_ROUTE, 0) < 0)
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goto cleanup;
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if (virNetlinkGetErrorCode(resp, recvbuflen) < 0) {
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("Error adding IP address to %s"), ifname);
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goto cleanup;
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}
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ret = 0;
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cleanup:
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nlmsg_free(nlmsg);
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VIR_FREE(resp);
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VIR_FREE(broadcast);
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return ret;
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}
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#else /* defined(__linux__) && defined(HAVE_LIBNL) */
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int virNetDevSetIPv4Address(const char *ifname,
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virSocketAddr *addr,
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@ -854,7 +982,7 @@ int virNetDevSetIPv4Address(const char *ifname,
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!(bcaststr = virSocketAddrFormat(&broadcast)))) {
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goto cleanup;
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}
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#ifdef IFCONFIG_PATH
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# ifdef IFCONFIG_PATH
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cmd = virCommandNew(IFCONFIG_PATH);
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virCommandAddArg(cmd, ifname);
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if (VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))
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@ -865,14 +993,14 @@ int virNetDevSetIPv4Address(const char *ifname,
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if (bcaststr)
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virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
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virCommandAddArg(cmd, "alias");
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#else
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# else
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cmd = virCommandNew(IP_PATH);
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virCommandAddArgList(cmd, "addr", "add", NULL);
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virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
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if (bcaststr)
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virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
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virCommandAddArgList(cmd, "dev", ifname, NULL);
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#endif
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# endif
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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@ -885,6 +1013,8 @@ int virNetDevSetIPv4Address(const char *ifname,
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return ret;
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}
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#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
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/**
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* virNetDevAddRoute:
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* @ifname: the interface name
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@ -276,6 +276,44 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
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return ret;
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}
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int virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen)
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{
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struct nlmsgerr *err;
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int result = 0;
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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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switch (err->error) {
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case 0: /* ACK */
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break;
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default:
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result = err->error;
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}
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break;
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case NLMSG_DONE:
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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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return result;
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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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return -EINVAL;
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}
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static void
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virNetlinkEventServerLock(virNetlinkEventSrvPrivatePtr driver)
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{
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@ -52,6 +52,8 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
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uint32_t src_pid, uint32_t dst_pid,
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unsigned int protocol, unsigned int groups);
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int virNetlinkGetErrorCode(struct nlmsghdr *resp, unsigned int recvbuflen);
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typedef void (*virNetlinkEventHandleCallback)(struct nlmsghdr *,
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unsigned int length,
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struct sockaddr_nl *peer,
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