2 * An implementation of key value pair (KVP) functionality for Linux.
5 * Copyright (C) 2010, Novell, Inc.
6 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <sys/types.h>
26 #include <sys/socket.h>
28 #include <sys/utsname.h>
29 #include <linux/types.h>
35 #include <arpa/inet.h>
36 #include <linux/connector.h>
37 #include <linux/hyperv.h>
38 #include <linux/netlink.h>
46 * KVP protocol: The user mode component first registers with the
47 * the kernel component. Subsequently, the kernel component requests, data
48 * for the specified keys. In response to this message the user mode component
49 * fills in the value corresponding to the specified key. We overload the
50 * sequence field in the cn_msg header to define our KVP message types.
52 * We use this infrastructure for also supporting queries from user mode
53 * application for state that may be maintained in the KVP kernel component.
59 FullyQualifiedDomainName = 0,
60 IntegrationServicesVersion, /*This key is serviced in the kernel*/
71 static char kvp_send_buffer[4096];
72 static char kvp_recv_buffer[4096 * 2];
73 static struct sockaddr_nl addr;
74 static int in_hand_shake = 1;
76 static char *os_name = "";
77 static char *os_major = "";
78 static char *os_minor = "";
79 static char *processor_arch;
80 static char *os_build;
81 static char *lic_version = "Unknown version";
82 static struct utsname uts_buf;
85 #define MAX_FILE_NAME 100
86 #define ENTRIES_PER_BLOCK 50
89 char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
90 char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
93 struct kvp_file_state {
96 struct kvp_record *records;
98 char fname[MAX_FILE_NAME];
101 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
103 static void kvp_acquire_lock(int pool)
105 struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
108 if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
109 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
114 static void kvp_release_lock(int pool)
116 struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
119 if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
121 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
126 static void kvp_update_file(int pool)
129 size_t bytes_written;
132 * We are going to write our in-memory registry out to
133 * disk; acquire the lock first.
135 kvp_acquire_lock(pool);
137 filep = fopen(kvp_file_info[pool].fname, "w");
139 kvp_release_lock(pool);
140 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
144 bytes_written = fwrite(kvp_file_info[pool].records,
145 sizeof(struct kvp_record),
146 kvp_file_info[pool].num_records, filep);
149 kvp_release_lock(pool);
152 static void kvp_update_mem_state(int pool)
155 size_t records_read = 0;
156 struct kvp_record *record = kvp_file_info[pool].records;
157 struct kvp_record *readp;
158 int num_blocks = kvp_file_info[pool].num_blocks;
159 int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
161 kvp_acquire_lock(pool);
163 filep = fopen(kvp_file_info[pool].fname, "r");
165 kvp_release_lock(pool);
166 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
169 while (!feof(filep)) {
170 readp = &record[records_read];
171 records_read += fread(readp, sizeof(struct kvp_record),
172 ENTRIES_PER_BLOCK * num_blocks,
177 * We have more data to read.
180 record = realloc(record, alloc_unit * num_blocks);
182 if (record == NULL) {
183 syslog(LOG_ERR, "malloc failed");
191 kvp_file_info[pool].num_blocks = num_blocks;
192 kvp_file_info[pool].records = record;
193 kvp_file_info[pool].num_records = records_read;
195 kvp_release_lock(pool);
197 static int kvp_file_init(void)
203 struct kvp_record *record;
204 struct kvp_record *readp;
207 int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
209 if (access("/var/opt/hyperv", F_OK)) {
210 if (mkdir("/var/opt/hyperv", S_IRUSR | S_IWUSR | S_IROTH)) {
211 syslog(LOG_ERR, " Failed to create /var/opt/hyperv");
216 for (i = 0; i < KVP_POOL_COUNT; i++) {
217 fname = kvp_file_info[i].fname;
220 sprintf(fname, "/var/opt/hyperv/.kvp_pool_%d", i);
221 fd = open(fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IROTH);
227 filep = fopen(fname, "r");
231 record = malloc(alloc_unit * num_blocks);
232 if (record == NULL) {
236 while (!feof(filep)) {
237 readp = &record[records_read];
238 records_read += fread(readp, sizeof(struct kvp_record),
244 * We have more data to read.
247 record = realloc(record, alloc_unit *
249 if (record == NULL) {
257 kvp_file_info[i].fd = fd;
258 kvp_file_info[i].num_blocks = num_blocks;
259 kvp_file_info[i].records = record;
260 kvp_file_info[i].num_records = records_read;
268 static int kvp_key_delete(int pool, __u8 *key, int key_size)
273 struct kvp_record *record;
276 * First update the in-memory state.
278 kvp_update_mem_state(pool);
280 num_records = kvp_file_info[pool].num_records;
281 record = kvp_file_info[pool].records;
283 for (i = 0; i < num_records; i++) {
284 if (memcmp(key, record[i].key, key_size))
287 * Found a match; just move the remaining
290 if (i == num_records) {
291 kvp_file_info[pool].num_records--;
292 kvp_update_file(pool);
298 for (; k < num_records; k++) {
299 strcpy(record[j].key, record[k].key);
300 strcpy(record[j].value, record[k].value);
304 kvp_file_info[pool].num_records--;
305 kvp_update_file(pool);
311 static int kvp_key_add_or_modify(int pool, __u8 *key, int key_size, __u8 *value,
316 struct kvp_record *record;
319 if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
320 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
324 * First update the in-memory state.
326 kvp_update_mem_state(pool);
328 num_records = kvp_file_info[pool].num_records;
329 record = kvp_file_info[pool].records;
330 num_blocks = kvp_file_info[pool].num_blocks;
332 for (i = 0; i < num_records; i++) {
333 if (memcmp(key, record[i].key, key_size))
336 * Found a match; just update the value -
337 * this is the modify case.
339 memcpy(record[i].value, value, value_size);
340 kvp_update_file(pool);
345 * Need to add a new entry;
347 if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
348 /* Need to allocate a larger array for reg entries. */
349 record = realloc(record, sizeof(struct kvp_record) *
350 ENTRIES_PER_BLOCK * (num_blocks + 1));
354 kvp_file_info[pool].num_blocks++;
357 memcpy(record[i].value, value, value_size);
358 memcpy(record[i].key, key, key_size);
359 kvp_file_info[pool].records = record;
360 kvp_file_info[pool].num_records++;
361 kvp_update_file(pool);
365 static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
370 struct kvp_record *record;
372 if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
373 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
377 * First update the in-memory state.
379 kvp_update_mem_state(pool);
381 num_records = kvp_file_info[pool].num_records;
382 record = kvp_file_info[pool].records;
384 for (i = 0; i < num_records; i++) {
385 if (memcmp(key, record[i].key, key_size))
388 * Found a match; just copy the value out.
390 memcpy(value, record[i].value, value_size);
397 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
398 __u8 *value, int value_size)
400 struct kvp_record *record;
403 * First update our in-memory database.
405 kvp_update_mem_state(pool);
406 record = kvp_file_info[pool].records;
408 if (index >= kvp_file_info[pool].num_records) {
412 memcpy(key, record[index].key, key_size);
413 memcpy(value, record[index].value, value_size);
418 void kvp_get_os_info(void)
424 os_build = uts_buf.release;
425 processor_arch = uts_buf.machine;
428 * The current windows host (win7) expects the build
429 * string to be of the form: x.y.z
430 * Strip additional information we may have.
432 p = strchr(os_build, '-');
436 file = fopen("/etc/SuSE-release", "r");
438 goto kvp_osinfo_found;
439 file = fopen("/etc/redhat-release", "r");
441 goto kvp_osinfo_found;
443 * Add code for other supported platforms.
447 * We don't have information about the os.
449 os_name = uts_buf.sysname;
453 /* up to three lines */
454 p = fgets(buf, sizeof(buf), file);
456 p = strchr(buf, '\n');
465 p = fgets(buf, sizeof(buf), file);
467 p = strchr(buf, '\n');
476 p = fgets(buf, sizeof(buf), file);
478 p = strchr(buf, '\n');
493 static void kvp_process_ipconfig_file(char *cmd,
494 char *config_buf, int len,
495 int element_size, int offset)
503 * First execute the command.
505 file = popen(cmd, "r");
510 memset(config_buf, 0, len);
511 while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
512 if ((len - strlen(config_buf)) < (element_size + 1))
517 strcat(config_buf, p);
518 strcat(config_buf, ";");
523 static void kvp_get_ipconfig_info(char *if_name,
524 struct hv_kvp_ipaddr_value *buffer)
532 * Get the address of default gateway (ipv4).
534 sprintf(cmd, "%s %s", "ip route show dev", if_name);
535 strcat(cmd, " | awk '/default/ {print $3 }'");
538 * Execute the command to gather gateway info.
540 kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
541 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
544 * Get the address of default gateway (ipv6).
546 sprintf(cmd, "%s %s", "ip -f inet6 route show dev", if_name);
547 strcat(cmd, " | awk '/default/ {print $3 }'");
550 * Execute the command to gather gateway info (ipv6).
552 kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
553 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
557 * Gather the DNS state.
558 * Since there is no standard way to get this information
559 * across various distributions of interest; we just invoke
560 * an external script that needs to be ported across distros
563 * Following is the expected format of the information from the script:
565 * ipaddr1 (nameserver1)
566 * ipaddr2 (nameserver2)
571 sprintf(cmd, "%s", "hv_get_dns_info");
574 * Execute the command to gather DNS info.
576 kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
577 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
580 * Gather the DHCP state.
581 * We will gather this state by invoking an external script.
582 * The parameter to the script is the interface name.
583 * Here is the expected output:
585 * Enabled: DHCP enabled.
588 sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
590 file = popen(cmd, "r");
594 p = fgets(dhcp_info, sizeof(dhcp_info), file);
600 if (!strncmp(p, "Enabled", 7))
601 buffer->dhcp_enabled = 1;
603 buffer->dhcp_enabled = 0;
609 static unsigned int hweight32(unsigned int *w)
611 unsigned int res = *w - ((*w >> 1) & 0x55555555);
612 res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
613 res = (res + (res >> 4)) & 0x0F0F0F0F;
614 res = res + (res >> 8);
615 return (res + (res >> 16)) & 0x000000FF;
618 static int kvp_process_ip_address(void *addrp,
619 int family, char *buffer,
620 int length, int *offset)
622 struct sockaddr_in *addr;
623 struct sockaddr_in6 *addr6;
628 if (family == AF_INET) {
629 addr = (struct sockaddr_in *)addrp;
630 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
631 addr_length = INET_ADDRSTRLEN;
633 addr6 = (struct sockaddr_in6 *)addrp;
634 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
635 addr_length = INET6_ADDRSTRLEN;
638 if ((length - *offset) < addr_length + 1)
641 strcpy(buffer, "inet_ntop failed\n");
650 *offset += strlen(str) + 1;
655 kvp_get_ip_address(int family, char *if_name, int op,
656 void *out_buffer, int length)
658 struct ifaddrs *ifap;
659 struct ifaddrs *curp;
664 struct hv_kvp_ipaddr_value *ip_buffer;
665 char cidr_mask[5]; /* /xyz */
670 struct sockaddr_in6 *addr6;
672 if (op == KVP_OP_ENUMERATE) {
675 ip_buffer = out_buffer;
676 buffer = (char *)ip_buffer->ip_addr;
677 ip_buffer->addr_family = 0;
680 * On entry into this function, the buffer is capable of holding the
684 if (getifaddrs(&ifap)) {
685 strcpy(buffer, "getifaddrs failed\n");
690 while (curp != NULL) {
691 if (curp->ifa_addr == NULL) {
692 curp = curp->ifa_next;
696 if ((if_name != NULL) &&
697 (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
699 * We want info about a specific interface;
702 curp = curp->ifa_next;
707 * We only support two address families: AF_INET and AF_INET6.
708 * If a family value of 0 is specified, we collect both
709 * supported address families; if not we gather info on
710 * the specified address family.
712 if ((family != 0) && (curp->ifa_addr->sa_family != family)) {
713 curp = curp->ifa_next;
716 if ((curp->ifa_addr->sa_family != AF_INET) &&
717 (curp->ifa_addr->sa_family != AF_INET6)) {
718 curp = curp->ifa_next;
722 if (op == KVP_OP_GET_IP_INFO) {
724 * Gather info other than the IP address.
725 * IP address info will be gathered later.
727 if (curp->ifa_addr->sa_family == AF_INET) {
728 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
732 error = kvp_process_ip_address(
742 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
745 * Get subnet info in CIDR format.
748 sn_str = (char *)ip_buffer->sub_net;
749 addr6 = (struct sockaddr_in6 *)
751 w = addr6->sin6_addr.s6_addr32;
753 for (i = 0; i < 4; i++)
754 weight += hweight32(&w[i]);
756 sprintf(cidr_mask, "/%d", weight);
757 if ((length - sn_offset) <
758 (strlen(cidr_mask) + 1))
762 strcpy(sn_str, cidr_mask);
764 strcat(sn_str, cidr_mask);
765 strcat((char *)ip_buffer->sub_net, ";");
766 sn_offset += strlen(sn_str) + 1;
770 * Collect other ip related configuration info.
773 kvp_get_ipconfig_info(if_name, ip_buffer);
777 error = kvp_process_ip_address(curp->ifa_addr,
778 curp->ifa_addr->sa_family,
784 curp = curp->ifa_next;
794 kvp_get_domain_name(char *buffer, int length)
796 struct addrinfo hints, *info ;
799 gethostname(buffer, length);
800 memset(&hints, 0, sizeof(hints));
801 hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
802 hints.ai_socktype = SOCK_STREAM;
803 hints.ai_flags = AI_CANONNAME;
805 error = getaddrinfo(buffer, NULL, &hints, &info);
807 strcpy(buffer, "getaddrinfo failed\n");
810 strcpy(buffer, info->ai_canonname);
816 netlink_send(int fd, struct cn_msg *msg)
818 struct nlmsghdr *nlh;
820 struct msghdr message;
824 size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
826 nlh = (struct nlmsghdr *)buffer;
828 nlh->nlmsg_pid = getpid();
829 nlh->nlmsg_type = NLMSG_DONE;
830 nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
831 nlh->nlmsg_flags = 0;
833 iov[0].iov_base = nlh;
834 iov[0].iov_len = sizeof(*nlh);
836 iov[1].iov_base = msg;
837 iov[1].iov_len = size;
839 memset(&message, 0, sizeof(message));
840 message.msg_name = &addr;
841 message.msg_namelen = sizeof(addr);
842 message.msg_iov = iov;
843 message.msg_iovlen = 2;
845 return sendmsg(fd, &message, 0);
850 int fd, len, sock_opt;
852 struct cn_msg *message;
854 struct nlmsghdr *incoming_msg;
855 struct cn_msg *incoming_cn_msg;
856 struct hv_kvp_msg *hv_msg;
864 openlog("KVP", 0, LOG_USER);
865 syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
867 * Retrieve OS release information.
871 if (kvp_file_init()) {
872 syslog(LOG_ERR, "Failed to initialize the pools");
876 fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
878 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
881 addr.nl_family = AF_NETLINK;
884 addr.nl_groups = CN_KVP_IDX;
887 error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
889 syslog(LOG_ERR, "bind failed; error:%d", error);
893 sock_opt = addr.nl_groups;
894 setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
896 * Register ourselves with the kernel.
898 message = (struct cn_msg *)kvp_send_buffer;
899 message->id.idx = CN_KVP_IDX;
900 message->id.val = CN_KVP_VAL;
902 hv_msg = (struct hv_kvp_msg *)message->data;
903 hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
905 message->len = sizeof(struct hv_kvp_msg);
907 len = netlink_send(fd, message);
909 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
917 struct sockaddr *addr_p = (struct sockaddr *) &addr;
918 socklen_t addr_l = sizeof(addr);
923 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
926 if (len < 0 || addr.nl_pid) {
927 syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
928 addr.nl_pid, errno, strerror(errno));
933 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
934 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
935 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
938 * We will use the KVP header information to pass back
939 * the error from this daemon. So, first copy the state
940 * and set the error code to success.
942 op = hv_msg->kvp_hdr.operation;
943 pool = hv_msg->kvp_hdr.pool;
944 hv_msg->error = HV_S_OK;
946 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
948 * Driver is registering with us; stash away the version
952 p = (char *)hv_msg->body.kvp_register.version;
953 lic_version = malloc(strlen(p) + 1);
955 strcpy(lic_version, p);
956 syslog(LOG_INFO, "KVP LIC Version: %s",
959 syslog(LOG_ERR, "malloc failed");
966 if (kvp_key_add_or_modify(pool,
967 hv_msg->body.kvp_set.data.key,
968 hv_msg->body.kvp_set.data.key_size,
969 hv_msg->body.kvp_set.data.value,
970 hv_msg->body.kvp_set.data.value_size))
971 hv_msg->error = HV_S_CONT;
975 if (kvp_get_value(pool,
976 hv_msg->body.kvp_set.data.key,
977 hv_msg->body.kvp_set.data.key_size,
978 hv_msg->body.kvp_set.data.value,
979 hv_msg->body.kvp_set.data.value_size))
980 hv_msg->error = HV_S_CONT;
984 if (kvp_key_delete(pool,
985 hv_msg->body.kvp_delete.key,
986 hv_msg->body.kvp_delete.key_size))
987 hv_msg->error = HV_S_CONT;
994 if (op != KVP_OP_ENUMERATE)
998 * If the pool is KVP_POOL_AUTO, dynamically generate
999 * both the key and the value; if not read from the
1002 if (pool != KVP_POOL_AUTO) {
1003 if (kvp_pool_enumerate(pool,
1004 hv_msg->body.kvp_enum_data.index,
1005 hv_msg->body.kvp_enum_data.data.key,
1006 HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1007 hv_msg->body.kvp_enum_data.data.value,
1008 HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1009 hv_msg->error = HV_S_CONT;
1013 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1014 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1015 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1017 switch (hv_msg->body.kvp_enum_data.index) {
1018 case FullyQualifiedDomainName:
1019 kvp_get_domain_name(key_value,
1020 HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1021 strcpy(key_name, "FullyQualifiedDomainName");
1023 case IntegrationServicesVersion:
1024 strcpy(key_name, "IntegrationServicesVersion");
1025 strcpy(key_value, lic_version);
1027 case NetworkAddressIPv4:
1028 kvp_get_ip_address(AF_INET, NULL, KVP_OP_ENUMERATE,
1029 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1030 strcpy(key_name, "NetworkAddressIPv4");
1032 case NetworkAddressIPv6:
1033 kvp_get_ip_address(AF_INET6, NULL, KVP_OP_ENUMERATE,
1034 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1035 strcpy(key_name, "NetworkAddressIPv6");
1038 strcpy(key_value, os_build);
1039 strcpy(key_name, "OSBuildNumber");
1042 strcpy(key_value, os_name);
1043 strcpy(key_name, "OSName");
1045 case OSMajorVersion:
1046 strcpy(key_value, os_major);
1047 strcpy(key_name, "OSMajorVersion");
1049 case OSMinorVersion:
1050 strcpy(key_value, os_minor);
1051 strcpy(key_name, "OSMinorVersion");
1054 strcpy(key_value, os_build);
1055 strcpy(key_name, "OSVersion");
1057 case ProcessorArchitecture:
1058 strcpy(key_value, processor_arch);
1059 strcpy(key_name, "ProcessorArchitecture");
1062 hv_msg->error = HV_S_CONT;
1066 * Send the value back to the kernel. The response is
1067 * already in the receive buffer. Update the cn_msg header to
1068 * reflect the key value that has been added to the message
1072 incoming_cn_msg->id.idx = CN_KVP_IDX;
1073 incoming_cn_msg->id.val = CN_KVP_VAL;
1074 incoming_cn_msg->ack = 0;
1075 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1077 len = netlink_send(fd, incoming_cn_msg);
1079 syslog(LOG_ERR, "net_link send failed; error:%d", len);