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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "netifd.h"
#include "interface.h"
#include "interface-ip.h"
#include "proto.h"
static struct avl_tree handlers;
unsigned int
parse_netmask_string(const char *str, bool v6)
{
struct in_addr addr;
unsigned int ret;
char *err = NULL;
if (!strchr(str, '.')) {
ret = strtoul(str, &err, 0);
if (err && *err)
goto error;
return ret;
}
if (v6)
goto error;
if (inet_aton(str, &addr) != 1)
goto error;
return 32 - fls(~(ntohl(addr.s_addr)));
error:
return ~0;
}
static bool
split_netmask(char *str, unsigned int *netmask, bool v6)
{
char *delim = strchr(str, '/');
if (delim) {
*(delim++) = 0;
*netmask = parse_netmask_string(delim, v6);
}
return true;
}
static int
parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
{
char *astr = alloca(strlen(str) + 1);
strcpy(astr, str);
if (!split_netmask(astr, netmask, af == AF_INET6))
return 0;
if (af == AF_INET6) {
if (*netmask > 128)
return 0;
} else {
if (*netmask > 32)
return 0;
}
return inet_pton(af, astr, addr);
}
struct device_addr *
proto_parse_ip_addr_string(const char *str, bool v6, int mask)
{
struct device_addr *addr;
int af = v6 ? AF_INET6 : AF_INET;
addr = calloc(1, sizeof(*addr));
addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
addr->mask = mask;
if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
free(addr);
return NULL;
}
return addr;
}
void add_proto_handler(struct proto_handler *p)
{
if (!handlers.comp)
avl_init(&handlers, avl_strcmp, false, NULL);
if (p->avl.key)
return;
p->avl.key = p->name;
avl_insert(&handlers, &p->avl);
}
static void
default_proto_free(struct interface_proto_state *proto)
{
free(proto);
}
static int
invalid_proto_handler(struct interface_proto_state *proto,
enum interface_proto_cmd cmd, bool force)
{
return -1;
}
static int
no_proto_handler(struct interface_proto_state *proto,
enum interface_proto_cmd cmd, bool force)
{
return 0;
}
static struct interface_proto_state *
default_proto_attach(const struct proto_handler *h,
struct interface *iface, struct blob_attr *attr)
{
struct interface_proto_state *proto;
proto = calloc(1, sizeof(*proto));
proto->free = default_proto_free;
proto->cb = no_proto_handler;
return proto;
}
static const struct proto_handler no_proto = {
.name = "none",
.flags = PROTO_FLAG_IMMEDIATE,
.attach = default_proto_attach,
};
static const struct proto_handler *
get_proto_handler(const char *name)
{
struct proto_handler *proto;
if (!strcmp(name, "none"))
return &no_proto;
if (!handlers.comp)
return NULL;
return avl_find_element(&handlers, name, proto, avl);
}
void
proto_init_interface(struct interface *iface, struct blob_attr *attr)
{
const struct proto_handler *proto = iface->proto_handler;
struct interface_proto_state *state = NULL;
if (proto)
state = proto->attach(proto, iface, attr);
if (!state) {
state = no_proto.attach(&no_proto, iface, attr);
state->cb = invalid_proto_handler;
}
state->handler = proto;
interface_set_proto_state(iface, state);
}
void
proto_attach_interface(struct interface *iface, const char *proto_name)
{
const struct proto_handler *proto = NULL;
if (!proto_name) {
interface_add_error(iface, "proto", "NO_PROTO", NULL, 0);
return;
}
proto = get_proto_handler(proto_name);
if (!proto)
interface_add_error(iface, "proto", "INVALID_PROTO", NULL, 0);
iface->proto_handler = proto;
}
int
interface_proto_event(struct interface_proto_state *proto,
enum interface_proto_cmd cmd, bool force)
{
enum interface_proto_event ev;
int ret;
ret = proto->cb(proto, cmd, force);
if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
goto out;
switch(cmd) {
case PROTO_CMD_SETUP:
ev = IFPEV_UP;
break;
case PROTO_CMD_TEARDOWN:
ev = IFPEV_DOWN;
break;
default:
return -EINVAL;
}
proto->proto_event(proto, ev);
out:
return ret;
}
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