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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 "proto.h"
#include "system.h"
struct static_proto_state {
struct interface_proto_state proto;
struct uci_section *section;
struct interface *iface;
};
static bool
split_netmask(char *str, unsigned int *netmask)
{
char *delim, *err = NULL;
delim = strchr(str, '/');
if (delim) {
*(delim++) = 0;
*netmask = strtoul(delim, &err, 10);
if (err && *err)
return false;
}
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))
return 0;
if (af == AF_INET6) {
if (*netmask > 128)
return 0;
} else {
if (*netmask > 32)
return 0;
}
return inet_pton(af, str, addr);
}
static bool
parse_addr(struct static_proto_state *state, 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->ctx = state;
addr->mask = mask;
if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
interface_add_error(state->iface, "proto-static", "INVALID_ADDRESS", &str, 1);
free(addr);
return false;
}
interface_add_address(state->iface, addr);
return true;
}
static int
parse_address_option(struct static_proto_state *state, struct uci_option *o, bool v6, int netmask)
{
struct uci_element *e;
int n_addr = 0;
if (o->type == UCI_TYPE_STRING) {
n_addr++;
if (!parse_addr(state, o->v.string, v6, netmask))
return -1;
} else {
uci_foreach_element(&o->v.list, e) {
n_addr++;
if (!parse_addr(state, e->name, v6, netmask))
return -1;
}
}
return n_addr;
}
static bool
parse_gateway_option(struct static_proto_state *state, struct uci_option *o, bool v6)
{
struct device_route *route;
const char *str = o->v.string;
int af = v6 ? AF_INET6 : AF_INET;
route = calloc(1, sizeof(*route));
if (!inet_pton(af, str, &route->nexthop)) {
interface_add_error(state->iface, "proto-static",
"INVALID_GATEWAY", &str, 1);
free(route);
return false;
}
route->mask = 0;
route->flags = DEVADDR_DEVICE | (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
interface_add_route(state->iface, route);
return true;
}
enum {
OPT_IPADDR,
OPT_IP6ADDR,
OPT_NETMASK,
OPT_GATEWAY,
OPT_IP6GW,
__OPT_MAX,
};
static const struct uci_parse_option opts[__OPT_MAX] = {
[OPT_IPADDR] = { .name = "ipaddr" },
[OPT_IP6ADDR] = { .name = "ip6addr" },
[OPT_NETMASK] = { .name = "netmask", .type = UCI_TYPE_STRING },
[OPT_GATEWAY] = { .name = "gateway", .type = UCI_TYPE_STRING },
[OPT_IP6GW] = { .name = "ip6gw", .type = UCI_TYPE_STRING },
};
static bool
static_proto_setup(struct static_proto_state *state)
{
struct uci_option *tb[__OPT_MAX];
struct in_addr ina;
const char *error;
int netmask = 32;
int n_v4 = 0, n_v6 = 0;
uci_parse_section(state->section, opts, __OPT_MAX, tb);
if (tb[OPT_NETMASK]) {
if (!inet_aton(tb[OPT_NETMASK]->v.string, &ina)) {
error = "INVALID_NETMASK";
goto error;
}
netmask = 32 - fls(~(ntohl(ina.s_addr)));
}
if (tb[OPT_IPADDR])
n_v4 = parse_address_option(state, tb[OPT_IPADDR], false, netmask);
if (tb[OPT_IP6ADDR])
n_v6 = parse_address_option(state, tb[OPT_IP6ADDR], true, netmask);
if (!n_v4 && !n_v6) {
error = "NO_ADDRESS";
goto error;
}
if (n_v4 < 0 || n_v6 < 0)
goto out;
if (n_v4 && tb[OPT_GATEWAY]) {
if (!parse_gateway_option(state, tb[OPT_GATEWAY], false))
goto out;
}
if (n_v6 && tb[OPT_IP6GW]) {
if (!parse_gateway_option(state, tb[OPT_IP6GW], true))
goto out;
}
return true;
error:
interface_add_error(state->iface, "proto-static", error, NULL, 0);
out:
return false;
}
static int
static_handler(struct interface_proto_state *proto,
enum interface_proto_cmd cmd, bool force)
{
struct static_proto_state *state;
int ret = 0;
state = container_of(proto, struct static_proto_state, proto);
switch (cmd) {
case PROTO_CMD_SETUP:
if (static_proto_setup(state))
break;
/* fall through */
case PROTO_CMD_TEARDOWN:
interface_del_ctx_addr(state->iface, state);
break;
}
return ret;
}
static void
static_free(struct interface_proto_state *proto)
{
struct static_proto_state *state;
state = container_of(proto, struct static_proto_state, proto);
free(state);
}
struct interface_proto_state *
static_attach(struct proto_handler *h, struct interface *iface,
struct uci_section *s)
{
struct static_proto_state *state;
state = calloc(1, sizeof(*state));
state->iface = iface;
state->section = s;
state->proto.free = static_free;
state->proto.handler = static_handler;
state->proto.flags = PROTO_FLAG_IMMEDIATE;
return &state->proto;
}
static struct proto_handler static_proto = {
.name = "static",
.attach = static_attach,
};
static void __init
static_proto_init(void)
{
add_proto_handler(&static_proto);
}
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