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#include "device-common.h"
#include "netlink.h"
#include "util.h"
#include "vector.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <net/if.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
static device_type_t device_type_interface;
typedef struct _device_interface {
device_t device;
device_common_t common;
} device_interface_t;
static void interface_free(device_t *dev) {
device_interface_t *iface = container_of(dev, device_interface_t, device);
VECTOR_FREE(iface->common.addrs);
free(NODE_NAME(dev));
free(iface);
}
static device_t * interface_process_config(const char *name, struct json_object *config) {
device_interface_t *iface = calloc(1, sizeof(*iface));
if (!iface)
return NULL;
device_t *dev = &iface->device;
dev->type = &device_type_interface;
NODE_NAME(dev) = strdup(name);
if (!NODE_NAME(dev)) {
free(iface);
return NULL;
}
if (!device_common_process_config(&iface->common, config))
goto err;
return dev;
err:
interface_free(dev);
return NULL;
}
static bool interface_set_link_flags(unsigned index, unsigned change, unsigned flags) {
char buf[MNL_SOCKET_BUFFER_SIZE];
struct mnl_socket *nl = nl_socket();
struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_SETLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
int seq = nlh->nlmsg_seq = nl_seq();
struct ifinfomsg *ifi = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifi));
ifi->ifi_index = index;
ifi->ifi_family = AF_UNSPEC;
ifi->ifi_change = change;
ifi->ifi_flags = flags;
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_sendto");
return false;
}
int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
if (ret == -1) {
perror("mnl_socket_recvfrom");
return false;
}
ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
if (ret == -1) {
perror("mnl_cb_run");
return false;
}
return true;
}
static bool interface_set_link_state(unsigned index, bool up) {
return interface_set_link_flags(index, IFF_UP, up ? IFF_UP : 0);
}
static bool interface_set_ipaddr(unsigned index, ipaddr_prefix_t *addr, bool add) {
char buf[MNL_SOCKET_BUFFER_SIZE];
struct mnl_socket *nl = nl_socket();
struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = add ? RTM_NEWADDR : RTM_DELADDR;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
if (add)
nlh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
int seq = nlh->nlmsg_seq = nl_seq();
struct ifaddrmsg *ifa = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifa));
ifa->ifa_index = index;
ifa->ifa_family = addr->addr.af;
ifa->ifa_prefixlen = addr->plen;
switch (addr->addr.af) {
case AF_INET:
mnl_attr_put(nlh, IFA_LOCAL, 4, &addr->addr.addr4);
break;
case AF_INET6:
mnl_attr_put(nlh, IFA_LOCAL, 16, &addr->addr.addr6);
break;
default:
errno = EINVAL;
return false;
}
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_sendto");
return false;
}
int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
if (ret == -1) {
perror("mnl_socket_recvfrom");
return false;
}
ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
if (ret == -1) {
perror("mnl_cb_run");
return false;
}
return true;
}
static void interface_init(device_t *dev) {
device_interface_t *iface = container_of(dev, device_interface_t, device);
unsigned index = if_nametoindex(NODE_NAME(dev));
if (!index)
return;
interface_set_link_state(index, true);
for (size_t i = 0; i < VECTOR_LEN(iface->common.addrs); i++)
interface_set_ipaddr(index, &VECTOR_INDEX(iface->common.addrs, i), true);
}
static void interface_update(device_t *dev) {
}
static void interface_release(device_t *dev) {
device_interface_t *iface = container_of(dev, device_interface_t, device);
unsigned index = if_nametoindex(NODE_NAME(dev));
if (!index)
return;
for (size_t i = 0; i < VECTOR_LEN(iface->common.addrs); i++)
interface_set_ipaddr(index, &VECTOR_INDEX(iface->common.addrs, i), false);
interface_set_link_state(index, false);
}
static device_type_t device_type_interface = {
.process_config = interface_process_config,
.free = interface_free,
.init = interface_init,
.update = interface_update,
.release = interface_release,
};
__attribute__((constructor))
static void interface_constructor(void) {
register_device_type("interface", &device_type_interface);
}
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