ct_expect.c
/*
* (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <libmnl/libmnl.h>
#include "obj.h"
static int nftnl_obj_ct_expect_set(struct nftnl_obj *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_CT_EXPECT_L3PROTO:
memcpy(&exp->l3proto, data, sizeof(exp->l3proto));
break;
case NFTNL_OBJ_CT_EXPECT_L4PROTO:
memcpy(&exp->l4proto, data, sizeof(exp->l4proto));
break;
case NFTNL_OBJ_CT_EXPECT_DPORT:
memcpy(&exp->dport, data, sizeof(exp->dport));
break;
case NFTNL_OBJ_CT_EXPECT_TIMEOUT:
memcpy(&exp->timeout, data, sizeof(exp->timeout));
break;
case NFTNL_OBJ_CT_EXPECT_SIZE:
memcpy(&exp->size, data, sizeof(exp->size));
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_obj_ct_expect_get(const struct nftnl_obj *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_CT_EXPECT_L3PROTO:
*data_len = sizeof(exp->l3proto);
return &exp->l3proto;
case NFTNL_OBJ_CT_EXPECT_L4PROTO:
*data_len = sizeof(exp->l4proto);
return &exp->l4proto;
case NFTNL_OBJ_CT_EXPECT_DPORT:
*data_len = sizeof(exp->dport);
return &exp->dport;
case NFTNL_OBJ_CT_EXPECT_TIMEOUT:
*data_len = sizeof(exp->timeout);
return &exp->timeout;
case NFTNL_OBJ_CT_EXPECT_SIZE:
*data_len = sizeof(exp->size);
return &exp->size;
}
return NULL;
}
static int nftnl_obj_ct_expect_cb(const struct nlattr *attr, void *data)
{
int type = mnl_attr_get_type(attr);
const struct nlattr **tb = data;
if (mnl_attr_type_valid(attr, NFTA_CT_EXPECT_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_CT_EXPECT_L3PROTO:
if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
abi_breakage();
break;
case NFTA_CT_EXPECT_L4PROTO:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
abi_breakage();
break;
case NFTA_CT_EXPECT_DPORT:
if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
abi_breakage();
break;
case NFTA_CT_EXPECT_TIMEOUT:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_CT_EXPECT_SIZE:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_obj_ct_expect_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
{
struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO))
mnl_attr_put_u16(nlh, NFTA_CT_EXPECT_L3PROTO, htons(exp->l3proto));
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO))
mnl_attr_put_u8(nlh, NFTA_CT_EXPECT_L4PROTO, exp->l4proto);
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_DPORT))
mnl_attr_put_u16(nlh, NFTA_CT_EXPECT_DPORT, htons(exp->dport));
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT))
mnl_attr_put_u32(nlh, NFTA_CT_EXPECT_TIMEOUT, exp->timeout);
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_SIZE))
mnl_attr_put_u8(nlh, NFTA_CT_EXPECT_SIZE, exp->size);
}
static int
nftnl_obj_ct_expect_parse(struct nftnl_obj *e, struct nlattr *attr)
{
struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
struct nlattr *tb[NFTA_CT_EXPECT_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_obj_ct_expect_cb, tb) < 0)
return -1;
if (tb[NFTA_CT_EXPECT_L3PROTO]) {
exp->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_EXPECT_L3PROTO]));
e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO);
}
if (tb[NFTA_CT_EXPECT_L4PROTO]) {
exp->l4proto = mnl_attr_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]);
e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO);
}
if (tb[NFTA_CT_EXPECT_DPORT]) {
exp->dport = ntohs(mnl_attr_get_u16(tb[NFTA_CT_EXPECT_DPORT]));
e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_DPORT);
}
if (tb[NFTA_CT_EXPECT_TIMEOUT]) {
exp->timeout = mnl_attr_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]);
e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT);
}
if (tb[NFTA_CT_EXPECT_SIZE]) {
exp->size = mnl_attr_get_u8(tb[NFTA_CT_EXPECT_SIZE]);
e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_SIZE);
}
return 0;
}
static int nftnl_obj_ct_expect_snprintf_default(char *buf, size_t len,
const struct nftnl_obj *e)
{
int ret = 0;
int offset = 0, remain = len;
struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO)) {
ret = snprintf(buf + offset, len, "family %d ", exp->l3proto);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO)) {
ret = snprintf(buf + offset, len, "protocol %d ", exp->l4proto);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_DPORT)) {
ret = snprintf(buf + offset, len, "dport %d ", exp->dport);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT)) {
ret = snprintf(buf + offset, len, "timeout %d ", exp->timeout);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_SIZE)) {
ret = snprintf(buf + offset, len, "size %d ", exp->size);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
buf[offset] = '\0';
return offset;
}
static int nftnl_obj_ct_expect_snprintf(char *buf, size_t len, uint32_t type,
uint32_t flags,
const struct nftnl_obj *e)
{
if (len)
buf[0] = '\0';
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
return nftnl_obj_ct_expect_snprintf_default(buf, len, e);
case NFTNL_OUTPUT_JSON:
default:
break;
}
return -1;
}
struct obj_ops obj_ops_ct_expect = {
.name = "ct_expect",
.type = NFT_OBJECT_CT_EXPECT,
.alloc_len = sizeof(struct nftnl_obj_ct_expect),
.max_attr = NFTA_CT_EXPECT_MAX,
.set = nftnl_obj_ct_expect_set,
.get = nftnl_obj_ct_expect_get,
.parse = nftnl_obj_ct_expect_parse,
.build = nftnl_obj_ct_expect_build,
.snprintf = nftnl_obj_ct_expect_snprintf,
};