Implement the KVP verb - KVP_OP_SET_IP_INFO. This operation configures the
specified interface based on the given configuration. Since configuring
an interface is very distro specific, we invoke an external script to
configure the interface.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
---
include/linux/hyperv.h | 2 +
tools/hv/hv_kvp_daemon.c | 443 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 445 insertions(+), 0 deletions(-)
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index b587c44..588d8f2 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -191,6 +191,8 @@ enum hv_kvp_exchg_pool {
#define HV_ERROR_NOT_SUPPORTED 0x80070032
#define HV_ERROR_MACHINE_LOCKED 0x800704F7
#define HV_ERROR_DEVICE_NOT_CONNECTED 0x8007048F
+#define HV_INVALIDARG 0x80070057
+#define HV_GUID_NOTFOUND 0x80041002
#define ADDR_FAMILY_NONE 0x00
#define ADDR_FAMILY_IPV4 0x01
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 8a18819..59669a8 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -31,6 +31,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
+#include <ctype.h>
#include <errno.h>
#include <arpa/inet.h>
#include <linux/connector.h>
@@ -41,6 +42,7 @@
#include <syslog.h>
#include <sys/stat.h>
#include <fcntl.h>
+#include <dirent.h>
/*
* KVP protocol: The user mode component first registers with the
@@ -68,6 +70,14 @@ enum key_index {
ProcessorArchitecture
};
+
+enum {
+ IPADDR = 0,
+ NETMASK,
+ GATEWAY,
+ DNS
+};
+
static char kvp_send_buffer[4096];
static char kvp_recv_buffer[4096 * 2];
static struct sockaddr_nl addr;
@@ -81,6 +91,11 @@ static char *os_build;
static char *lic_version = "Unknown version";
static struct utsname uts_buf;
+/*
+ * The location of the interface configuration file.
+ */
+
+#define KVP_CONFIG_LOC "/var/opt/"
#define MAX_FILE_NAME 100
#define ENTRIES_PER_BLOCK 50
@@ -491,6 +506,104 @@ done:
return;
}
+
+
+/*
+ * Retrieve an interface name corresponding to the specified guid.
+ * If there is a match, the function returns a pointer
+ * to the interface name and if not, a NULL is returned.
+ * If a match is found, the caller is responsible for
+ * freeing the memory.
+ */
+
+static char *kvp_get_if_name(char *guid)
+{
+ DIR *dir;
+ struct dirent *entry;
+ FILE *file;
+ char *p, *q, *x;
+ char *if_name = NULL;
+ char buf[256];
+ char *kvp_net_dir = "/sys/class/net/";
+ char dev_id[256];
+
+ dir = opendir(kvp_net_dir);
+ if (dir == NULL)
+ return NULL;
+
+ snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
+ q = dev_id + strlen(kvp_net_dir);
+
+ while ((entry = readdir(dir)) != NULL) {
+ /*
+ * Set the state for the next pass.
+ */
+ *q = '\0';
+ strcat(dev_id, entry->d_name);
+ strcat(dev_id, "/device/device_id");
+
+ file = fopen(dev_id, "r");
+ if (file == NULL)
+ continue;
+
+ p = fgets(buf, sizeof(buf), file);
+ if (p) {
+ x = strchr(p, '\n');
+ if (x)
+ *x = '\0';
+
+ if (!strcmp(p, guid)) {
+ /*
+ * Found the guid match; return the interface
+ * name. The caller will free the memory.
+ */
+ if_name = strdup(entry->d_name);
+ fclose(file);
+ break;
+ }
+ }
+ fclose(file);
+ }
+
+ closedir(dir);
+ return if_name;
+}
+
+/*
+ * Retrieve the MAC address given the interface name.
+ */
+
+static char *kvp_if_name_to_mac(char *if_name)
+{
+ FILE *file;
+ char *p, *x;
+ char buf[256];
+ char addr_file[256];
+ int i;
+ char *mac_addr = NULL;
+
+ snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
+ if_name, "/address");
+
+ file = fopen(addr_file, "r");
+ if (file == NULL)
+ return NULL;
+
+ p = fgets(buf, sizeof(buf), file);
+ if (p) {
+ x = strchr(p, '\n');
+ if (x)
+ *x = '\0';
+ for (i = 0; i < strlen(p); i++)
+ p[i] = toupper(p[i]);
+ mac_addr = strdup(p);
+ }
+
+ fclose(file);
+ return mac_addr;
+}
+
+
static void kvp_process_ipconfig_file(char *cmd,
char *config_buf, int len,
int element_size, int offset)
@@ -791,6 +904,315 @@ getaddr_done:
}
+static int expand_ipv6(char *addr, int type)
+{
+ int ret;
+ struct in6_addr v6_addr;
+
+ ret = inet_pton(AF_INET6, addr, &v6_addr);
+
+ if (ret != 1) {
+ if (type == NETMASK)
+ return 1;
+ return 0;
+ }
+
+ sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
+ "%02x%02x:%02x%02x:%02x%02x",
+ (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
+ (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
+ (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
+ (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
+ (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
+ (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
+ (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
+ (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
+
+ return 1;
+
+}
+
+static int is_ipv4(char *addr)
+{
+ int ret;
+ struct in_addr ipv4_addr;
+
+ ret = inet_pton(AF_INET, addr, &ipv4_addr);
+
+ if (ret == 1)
+ return 1;
+ return 0;
+}
+
+static int parse_ip_val_buffer(char *in_buf, int *offset,
+ char *out_buf, int out_len)
+{
+ char *x;
+ char *start;
+
+ /*
+ * in_buf has sequence of characters that are seperated by
+ * the character ';'. The last sequence does not have the
+ * terminating ";" character.
+ */
+ start = in_buf + *offset;
+
+ x = strchr(start, ';');
+ if (x)
+ *x = 0;
+ else
+ x = start + strlen(start);
+
+ if (strlen(start) != 0) {
+ int i = 0;
+ /*
+ * Get rid of leading spaces.
+ */
+ while (start[i] == ' ')
+ i++;
+
+ if ((x - start) <= out_len) {
+ strcpy(out_buf, (start + i));
+ *offset += (x - start) + 1;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
+{
+ int ret;
+
+ ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
+
+ if (ret < 0)
+ return HV_E_FAIL;
+
+ return 0;
+}
+
+
+static int process_ip_string(FILE *f, char *ip_string, int type)
+{
+ int error = 0;
+ char addr[INET6_ADDRSTRLEN];
+ int i = 0;
+ int j = 0;
+ char str[256];
+ char sub_str[10];
+ int offset = 0;
+
+ memset(addr, 0, sizeof(addr));
+
+ while (parse_ip_val_buffer(ip_string, &offset, addr,
+ (MAX_IP_ADDR_SIZE * 2))) {
+
+ sub_str[0] = 0;
+ if (is_ipv4(addr)) {
+ switch (type) {
+ case IPADDR:
+ snprintf(str, sizeof(str), "%s", "IPADDR");
+ break;
+ case NETMASK:
+ snprintf(str, sizeof(str), "%s", "NETMASK");
+ break;
+ case GATEWAY:
+ snprintf(str, sizeof(str), "%s", "GATEWAY");
+ break;
+ case DNS:
+ snprintf(str, sizeof(str), "%s", "DNS");
+ break;
+ }
+ if (i != 0) {
+ if (type != DNS) {
+ snprintf(sub_str, sizeof(sub_str),
+ "_%d", i++);
+ } else {
+ snprintf(sub_str, sizeof(sub_str),
+ "%d", ++i);
+ }
+ } else if (type == DNS) {
+ snprintf(sub_str, sizeof(sub_str), "%d", ++i);
+ }
+
+
+ } else if (expand_ipv6(addr, type)) {
+ switch (type) {
+ case IPADDR:
+ snprintf(str, sizeof(str), "%s", "IPV6ADDR");
+ break;
+ case NETMASK:
+ snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
+ break;
+ case GATEWAY:
+ snprintf(str, sizeof(str), "%s",
+ "IPV6_DEFAULTGW");
+ break;
+ case DNS:
+ snprintf(str, sizeof(str), "%s", "DNS");
+ break;
+ }
+ if ((j != 0) || (type == DNS)) {
+ if (type != DNS) {
+ snprintf(sub_str, sizeof(sub_str),
+ "_%d", j++);
+ } else {
+ snprintf(sub_str, sizeof(sub_str),
+ "%d", ++i);
+ }
+ } else if (type == DNS) {
+ snprintf(sub_str, sizeof(sub_str),
+ "%d", ++i);
+ }
+ } else {
+ return HV_INVALIDARG;
+ }
+
+ error = kvp_write_file(f, str, sub_str, addr);
+ if (error)
+ return error;
+ memset(addr, 0, sizeof(addr));
+ }
+
+ return 0;
+}
+
+static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
+{
+ int error = 0;
+ char if_file[128];
+ FILE *file;
+ char cmd[512];
+ char *mac_addr;
+
+ /*
+ * Set the configuration for the specified interface with
+ * the information provided. Since there is no standard
+ * way to configure an interface, we will have an external
+ * script that does the job of configuring the interface and
+ * flushing the configuration.
+ *
+ * The parameters passed to this external script are:
+ * 1. A configuration file that has the specified configuration.
+ *
+ * We will embed the name of the interface in the configuration
+ * file: ifcfg-ethx (where ethx is the interface name).
+ *
+ * The information provided here may be more than what is needed
+ * in a given distro to configure the interface and so are free
+ * ignore information that may not be relevant.
+ *
+ * Here is the format of the ip configuration file:
+ *
+ * HWADDR=macaddr
+ * IF_NAME=interface name
+ * DHCP=yes (This is optional; if yes, DHCP is configured)
+ *
+ * IPADDR=ipaddr1
+ * IPADDR_1=ipaddr2
+ * IPADDR_x=ipaddry (where y = x + 1)
+ *
+ * NETMASK=netmask1
+ * NETMASK_x=netmasky (where y = x + 1)
+ *
+ * GATEWAY=ipaddr1
+ * GATEWAY_x=ipaddry (where y = x + 1)
+ *
+ * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
+ *
+ * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
+ * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
+ * IPV6NETMASK.
+ *
+ * The host can specify multiple ipv4 and ipv6 addresses to be
+ * configured for the interface. Furthermore, the configuration
+ * needs to be persistent. A subsequent GET call on the interface
+ * is expected to return the configuration that is set via the SET
+ * call.
+ */
+
+ snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
+ "hyperv/ifcfg-", if_name);
+
+ file = fopen(if_file, "w");
+
+ if (file == NULL) {
+ syslog(LOG_ERR, "Failed to open config file");
+ return HV_E_FAIL;
+ }
+
+ /*
+ * First write out the MAC address.
+ */
+
+ mac_addr = kvp_if_name_to_mac(if_name);
+ if (mac_addr == NULL) {
+ error = HV_E_FAIL;
+ goto setval_error;
+ }
+
+ error = kvp_write_file(file, "HWADDR", "", mac_addr);
+ if (error)
+ goto setval_error;
+
+ error = kvp_write_file(file, "IF_NAME", "", if_name);
+ if (error)
+ goto setval_error;
+
+ if (new_val->dhcp_enabled) {
+ error = kvp_write_file(file, "DHCP", "", "yes");
+ if (error)
+ goto setval_error;
+
+ /*
+ * We are done!.
+ */
+ goto setval_done;
+ }
+
+ /*
+ * Write the configuration for ipaddress, netmask, gateway and
+ * name servers.
+ */
+
+ error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
+ if (error)
+ goto setval_error;
+
+ error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
+ if (error)
+ goto setval_error;
+
+ error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
+ if (error)
+ goto setval_error;
+
+ error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
+ if (error)
+ goto setval_error;
+
+setval_done:
+ free(mac_addr);
+ fclose(file);
+
+ /*
+ * Now that we have populated the configuration file,
+ * invoke the external script to do its magic.
+ */
+
+ snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
+ system(cmd);
+ return 0;
+
+setval_error:
+ syslog(LOG_ERR, "Failed to write config file");
+ free(mac_addr);
+ fclose(file);
+ return error;
+}
+
+
static int
kvp_get_domain_name(char *buffer, int length)
{
@@ -860,6 +1282,8 @@ int main(void)
char *key_name;
int op;
int pool;
+ char *if_name;
+ struct hv_kvp_ipaddr_value *kvp_ip_val;
daemon(1, 0);
openlog("KVP", 0, LOG_USER);
@@ -963,6 +1387,25 @@ int main(void)
}
switch (op) {
+ case KVP_OP_SET_IP_INFO:
+ kvp_ip_val = &hv_msg->body.kvp_ip_val;
+ if_name = kvp_get_if_name(
+ (char *)kvp_ip_val->adapter_id);
+ if (if_name == NULL) {
+ /*
+ * We could not map the guid to an
+ * interface name; return error.
+ */
+ hv_msg->error = HV_GUID_NOTFOUND;
+ break;
+ }
+ error = kvp_set_ip_info(if_name, kvp_ip_val);
+ if (error)
+ hv_msg->error = error;
+
+ free(if_name);
+ break;
+
case KVP_OP_SET:
if (kvp_key_add_or_modify(pool,
hv_msg->body.kvp_set.data.key,
--
1.7.4.1
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