ct_timeout.c
/*
* (C) 2018 by Harsha Sharma <harshasharmaiitr@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 <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/object.h>
#include "obj.h"
static const char *const tcp_state_to_name[] = {
[NFTNL_CTTIMEOUT_TCP_SYN_SENT] = "SYN_SENT",
[NFTNL_CTTIMEOUT_TCP_SYN_RECV] = "SYN_RECV",
[NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = "ESTABLISHED",
[NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = "FIN_WAIT",
[NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = "CLOSE_WAIT",
[NFTNL_CTTIMEOUT_TCP_LAST_ACK] = "LAST_ACK",
[NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = "TIME_WAIT",
[NFTNL_CTTIMEOUT_TCP_CLOSE] = "CLOSE",
[NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = "SYN_SENT2",
[NFTNL_CTTIMEOUT_TCP_RETRANS] = "RETRANS",
[NFTNL_CTTIMEOUT_TCP_UNACK] = "UNACKNOWLEDGED",
};
static uint32_t tcp_dflt_timeout[] = {
[NFTNL_CTTIMEOUT_TCP_SYN_SENT] = 120,
[NFTNL_CTTIMEOUT_TCP_SYN_RECV] = 60,
[NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 432000,
[NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = 120,
[NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 60,
[NFTNL_CTTIMEOUT_TCP_LAST_ACK] = 30,
[NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = 120,
[NFTNL_CTTIMEOUT_TCP_CLOSE] = 10,
[NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = 120,
[NFTNL_CTTIMEOUT_TCP_RETRANS] = 300,
[NFTNL_CTTIMEOUT_TCP_UNACK] = 300,
};
static const char *const udp_state_to_name[] = {
[NFTNL_CTTIMEOUT_UDP_UNREPLIED] = "UNREPLIED",
[NFTNL_CTTIMEOUT_UDP_REPLIED] = "REPLIED",
};
static uint32_t udp_dflt_timeout[] = {
[NFTNL_CTTIMEOUT_UDP_UNREPLIED] = 30,
[NFTNL_CTTIMEOUT_UDP_REPLIED] = 180,
};
static struct {
uint32_t attr_max;
const char *const *state_to_name;
uint32_t *dflt_timeout;
} timeout_protocol[IPPROTO_MAX] = {
[IPPROTO_TCP] = {
.attr_max = NFTNL_CTTIMEOUT_TCP_MAX,
.state_to_name = tcp_state_to_name,
.dflt_timeout = tcp_dflt_timeout,
},
[IPPROTO_UDP] = {
.attr_max = NFTNL_CTTIMEOUT_UDP_MAX,
.state_to_name = udp_state_to_name,
.dflt_timeout = udp_dflt_timeout,
},
};
struct _container_policy_cb {
unsigned int nlattr_max;
void *tb;
};
static int
nftnl_timeout_policy_attr_set_u32(struct nftnl_obj *e,
uint32_t type, uint32_t data)
{
struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
if (type >= NFTNL_CTTIMEOUT_ARRAY_MAX)
return -1;
t->timeout[type] = data;
if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)))
e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
return 0;
}
static int
parse_timeout_attr_policy_cb(const struct nlattr *attr, void *data)
{
struct _container_policy_cb *data_cb = data;
const struct nlattr **tb = data_cb->tb;
uint16_t type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, data_cb->nlattr_max) < 0)
return MNL_CB_OK;
if (type > 0 && type <= data_cb->nlattr_max) {
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
tb[type - 1] = attr;
}
return MNL_CB_OK;
}
static int
timeout_parse_attr_data(struct nftnl_obj *e,
const struct nlattr *nest)
{
struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
unsigned int attr_max = timeout_protocol[t->l4proto].attr_max;
struct nlattr *tb[attr_max];
struct _container_policy_cb cnt = {
.nlattr_max = attr_max,
.tb = tb,
};
unsigned int i;
memset(tb, 0, sizeof(struct nlattr *) * attr_max);
if (mnl_attr_parse_nested(nest, parse_timeout_attr_policy_cb, &cnt) < 0)
return -1;
for (i = 0; i < array_size(tb); i++) {
if (tb[i]) {
nftnl_timeout_policy_attr_set_u32(e, i,
ntohl(mnl_attr_get_u32(tb[i])));
}
}
return 0;
}
static int nftnl_obj_ct_timeout_set(struct nftnl_obj *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
memcpy(&timeout->l3proto, data, sizeof(timeout->l3proto));
break;
case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
memcpy(&timeout->l4proto, data, sizeof(timeout->l4proto));
break;
case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
memcpy(timeout->timeout, data,
sizeof(uint32_t) * NFTNL_CTTIMEOUT_ARRAY_MAX);
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_obj_ct_timeout_get(const struct nftnl_obj *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
*data_len = sizeof(timeout->l3proto);
return &timeout->l3proto;
case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
*data_len = sizeof(timeout->l4proto);
return &timeout->l4proto;
case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
*data_len = sizeof(uint32_t) * NFTNL_CTTIMEOUT_ARRAY_MAX;
return timeout->timeout;
}
return NULL;
}
static int nftnl_obj_ct_timeout_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_TIMEOUT_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_CT_TIMEOUT_L3PROTO:
if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
abi_breakage();
break;
case NFTA_CT_TIMEOUT_L4PROTO:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
abi_breakage();
break;
case NFTA_CT_TIMEOUT_DATA:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_obj_ct_timeout_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
{
struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
struct nlattr *nest;
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
mnl_attr_put_u16(nlh, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3proto));
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
mnl_attr_put_u8(nlh, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto);
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
int i;
nest = mnl_attr_nest_start(nlh, NFTA_CT_TIMEOUT_DATA);
for (i = 0; i < timeout_protocol[timeout->l4proto].attr_max; i++)
mnl_attr_put_u32(nlh, i+1, htonl(timeout->timeout[i]));
mnl_attr_nest_end(nlh, nest);
}
}
static int
nftnl_obj_ct_timeout_parse(struct nftnl_obj *e, struct nlattr *attr)
{
struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
struct nlattr *tb[NFTA_CT_TIMEOUT_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_obj_ct_timeout_cb, tb) < 0)
return -1;
if (tb[NFTA_CT_TIMEOUT_L3PROTO]) {
timeout->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO);
}
if (tb[NFTA_CT_TIMEOUT_L4PROTO]) {
timeout->l4proto = mnl_attr_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO);
}
if (tb[NFTA_CT_TIMEOUT_DATA]) {
if (timeout_parse_attr_data(e, tb[NFTA_CT_TIMEOUT_DATA]) < 0)
return -1;
e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
}
return 0;
}
static int nftnl_obj_ct_timeout_snprintf_default(char *buf, size_t len,
const struct nftnl_obj *e)
{
int ret = 0;
int offset = 0, remain = len;
struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO)) {
ret = snprintf(buf + offset, len, "family %d ",
timeout->l3proto);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)) {
ret = snprintf(buf + offset, len, "protocol %d ",
timeout->l4proto);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
uint8_t l4num = timeout->l4proto;
int i;
/* default to generic protocol tracker. */
if (timeout_protocol[timeout->l4proto].attr_max == 0)
l4num = IPPROTO_RAW;
ret = snprintf(buf + offset, len, "policy = {");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
for (i = 0; i < timeout_protocol[l4num].attr_max; i++) {
const char *state_name =
timeout_protocol[l4num].state_to_name[i][0] ?
timeout_protocol[l4num].state_to_name[i] :
"UNKNOWN";
if (timeout->timeout[i] != timeout_protocol[l4num].dflt_timeout[i]) {
ret = snprintf(buf + offset, len,
"%s = %u,", state_name, timeout->timeout[i]);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
}
ret = snprintf(buf + offset, len, "}");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
buf[offset] = '\0';
return offset;
}
static int nftnl_obj_ct_timeout_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_timeout_snprintf_default(buf, len, e);
case NFTNL_OUTPUT_JSON:
default:
break;
}
return -1;
}
struct obj_ops obj_ops_ct_timeout = {
.name = "ct_timeout",
.type = NFT_OBJECT_CT_TIMEOUT,
.alloc_len = sizeof(struct nftnl_obj_ct_timeout),
.max_attr = NFTA_CT_TIMEOUT_MAX,
.set = nftnl_obj_ct_timeout_set,
.get = nftnl_obj_ct_timeout_get,
.parse = nftnl_obj_ct_timeout_parse,
.build = nftnl_obj_ct_timeout_build,
.snprintf = nftnl_obj_ct_timeout_snprintf,
};
_container_policy_cb
Definition: ct_timeout.c:79