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Tools: hv: kvp: use misc char device to communicate with kernel 

Use /dev/vmbus/hv_kvp instead of netlink.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Vitaly Kuznetsov 2015-04-11 18:07:55 -07:00 committed by Greg Kroah-Hartman
parent 11bc3a5fa9
commit 8ddca80885
1 changed files with 31 additions and 135 deletions
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166
tools/hv/hv_kvp_daemon.c
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@ -33,7 +33,6 @@
#include <ctype.h>
#include <errno.h>
#include <arpa/inet.h>
#include <linux/connector.h>
#include <linux/hyperv.h>
#include <linux/netlink.h>
#include <ifaddrs.h>
@ -79,7 +78,6 @@ enum {
DNS
};
static struct sockaddr_nl addr;
static int in_hand_shake = 1;
static char *os_name = "";
@ -1387,34 +1385,6 @@ kvp_get_domain_name(char *buffer, int length)
freeaddrinfo(info);
}
static int
netlink_send(int fd, struct cn_msg *msg)
{
struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
unsigned int size;
struct msghdr message;
struct iovec iov[2];
size = sizeof(struct cn_msg) + msg->len;
nlh.nlmsg_pid = getpid();
nlh.nlmsg_len = NLMSG_LENGTH(size);
iov[0].iov_base = &nlh;
iov[0].iov_len = sizeof(nlh);
iov[1].iov_base = msg;
iov[1].iov_len = size;
memset(&message, 0, sizeof(message));
message.msg_name = &addr;
message.msg_namelen = sizeof(addr);
message.msg_iov = iov;
message.msg_iovlen = 2;
return sendmsg(fd, &message, 0);
}
void print_usage(char *argv[])
{
fprintf(stderr, "Usage: %s [options]\n"
@ -1425,22 +1395,17 @@ void print_usage(char *argv[])
int main(int argc, char *argv[])
{
int fd, len, nl_group;
int kvp_fd, len;
int error;
struct cn_msg *message;
struct pollfd pfd;
struct nlmsghdr *incoming_msg;
struct cn_msg *incoming_cn_msg;
struct hv_kvp_msg *hv_msg;
char *p;
char *p;
struct hv_kvp_msg hv_msg[1];
char *key_value;
char *key_name;
int op;
int pool;
char *if_name;
struct hv_kvp_ipaddr_value *kvp_ip_val;
char *kvp_recv_buffer;
size_t kvp_recv_buffer_len;
int daemonize = 1, long_index = 0, opt;
static struct option long_options[] = {
@ -1468,12 +1433,14 @@ int main(int argc, char *argv[])
openlog("KVP", 0, LOG_USER);
syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
kvp_recv_buffer_len = NLMSG_LENGTH(0) + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
if (!kvp_recv_buffer) {
syslog(LOG_ERR, "Failed to allocate netlink buffer");
kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR);
if (kvp_fd < 0) {
syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
errno, strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Retrieve OS release information.
*/
@ -1489,100 +1456,44 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
if (fd < 0) {
syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
strerror(errno));
exit(EXIT_FAILURE);
}
addr.nl_family = AF_NETLINK;
addr.nl_pad = 0;
addr.nl_pid = 0;
addr.nl_groups = 0;
error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
if (error < 0) {
syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
close(fd);
exit(EXIT_FAILURE);
}
nl_group = CN_KVP_IDX;
if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
close(fd);
exit(EXIT_FAILURE);
}
/*
* Register ourselves with the kernel.
*/
message = (struct cn_msg *)kvp_recv_buffer;
message->id.idx = CN_KVP_IDX;
message->id.val = CN_KVP_VAL;
hv_msg = (struct hv_kvp_msg *)message->data;
hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
message->ack = 0;
message->len = sizeof(struct hv_kvp_msg);
len = netlink_send(fd, message);
if (len < 0) {
syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
close(fd);
len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
errno, strerror(errno));
close(kvp_fd);
exit(EXIT_FAILURE);
}
pfd.fd = fd;
pfd.fd = kvp_fd;
while (1) {
struct sockaddr *addr_p = (struct sockaddr *) &addr;
socklen_t addr_l = sizeof(addr);
pfd.events = POLLIN;
pfd.revents = 0;
if (poll(&pfd, 1, -1) < 0) {
syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
if (errno == EINVAL) {
close(fd);
close(kvp_fd);
exit(EXIT_FAILURE);
}
else
continue;
}
len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
addr_p, &addr_l);
len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len < 0) {
int saved_errno = errno;
syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
addr.nl_pid, errno, strerror(errno));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "read failed; error:%d %s",
errno, strerror(errno));
if (saved_errno == ENOBUFS) {
syslog(LOG_ERR, "receive error: ignored");
continue;
}
close(fd);
return -1;
close(kvp_fd);
return EXIT_FAILURE;
}
if (addr.nl_pid) {
syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
addr.nl_pid);
continue;
}
incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
if (incoming_msg->nlmsg_type != NLMSG_DONE)
continue;
incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
/*
* We will use the KVP header information to pass back
* the error from this daemon. So, first copy the state
@ -1603,7 +1514,7 @@ int main(int argc, char *argv[])
if (lic_version) {
strcpy(lic_version, p);
syslog(LOG_INFO, "KVP LIC Version: %s",
lic_version);
lic_version);
} else {
syslog(LOG_ERR, "malloc failed");
}
@ -1702,7 +1613,6 @@ int main(int argc, char *argv[])
goto kvp_done;
}
hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
@ -1753,31 +1663,17 @@ int main(int argc, char *argv[])
hv_msg->error = HV_S_CONT;
break;
}
/*
* Send the value back to the kernel. The response is
* already in the receive buffer. Update the cn_msg header to
* reflect the key value that has been added to the message
*/
/* Send the value back to the kernel. */
kvp_done:
incoming_cn_msg->id.idx = CN_KVP_IDX;
incoming_cn_msg->id.val = CN_KVP_VAL;
incoming_cn_msg->ack = 0;
incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
len = netlink_send(fd, incoming_cn_msg);
if (len < 0) {
int saved_errno = errno;
syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
strerror(errno));
if (saved_errno == ENOMEM || saved_errno == ENOBUFS) {
syslog(LOG_ERR, "send error: ignored");
continue;
}
len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "write failed; error: %d %s", errno,
strerror(errno));
exit(EXIT_FAILURE);
}
}
close(kvp_fd);
exit(0);
}