chain.c
/*
* (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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.
*
* This code has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#include "internal.h"
#include <time.h>
#include <endian.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <inttypes.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/netfilter.h>
#include <linux/netfilter_arp.h>
#include <libnftnl/chain.h>
#include <libnftnl/rule.h>
struct nftnl_chain {
struct list_head head;
struct hlist_node hnode;
const char *name;
const char *type;
const char *table;
const char *dev;
const char **dev_array;
int dev_array_len;
uint32_t family;
uint32_t policy;
uint32_t hooknum;
int32_t prio;
uint32_t chain_flags;
uint32_t use;
uint64_t packets;
uint64_t bytes;
uint64_t handle;
uint32_t flags;
uint32_t chain_id;
struct {
void *data;
uint32_t len;
} user;
struct list_head rule_list;
};
static const char *nftnl_hooknum2str(int family, int hooknum)
{
switch (family) {
case NFPROTO_IPV4:
case NFPROTO_IPV6:
case NFPROTO_INET:
case NFPROTO_BRIDGE:
switch (hooknum) {
case NF_INET_PRE_ROUTING:
return "prerouting";
case NF_INET_LOCAL_IN:
return "input";
case NF_INET_FORWARD:
return "forward";
case NF_INET_LOCAL_OUT:
return "output";
case NF_INET_POST_ROUTING:
return "postrouting";
}
break;
case NFPROTO_ARP:
switch (hooknum) {
case NF_ARP_IN:
return "input";
case NF_ARP_OUT:
return "output";
case NF_ARP_FORWARD:
return "forward";
}
break;
case NFPROTO_NETDEV:
switch (hooknum) {
case NF_NETDEV_INGRESS:
return "ingress";
}
break;
}
return "unknown";
}
EXPORT_SYMBOL(nftnl_chain_alloc);
struct nftnl_chain *nftnl_chain_alloc(void)
{
struct nftnl_chain *c;
c = calloc(1, sizeof(struct nftnl_chain));
if (c == NULL)
return NULL;
INIT_LIST_HEAD(&c->rule_list);
return c;
}
EXPORT_SYMBOL(nftnl_chain_free);
void nftnl_chain_free(const struct nftnl_chain *c)
{
struct nftnl_rule *r, *tmp;
int i;
list_for_each_entry_safe(r, tmp, &c->rule_list, head)
nftnl_rule_free(r);
if (c->flags & (1 << NFTNL_CHAIN_NAME))
xfree(c->name);
if (c->flags & (1 << NFTNL_CHAIN_TABLE))
xfree(c->table);
if (c->flags & (1 << NFTNL_CHAIN_TYPE))
xfree(c->type);
if (c->flags & (1 << NFTNL_CHAIN_DEV))
xfree(c->dev);
if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
xfree(c->user.data);
if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
for (i = 0; i < c->dev_array_len; i++)
xfree(c->dev_array[i]);
xfree(c->dev_array);
}
xfree(c);
}
EXPORT_SYMBOL(nftnl_chain_is_set);
bool nftnl_chain_is_set(const struct nftnl_chain *c, uint16_t attr)
{
return c->flags & (1 << attr);
}
EXPORT_SYMBOL(nftnl_chain_unset);
void nftnl_chain_unset(struct nftnl_chain *c, uint16_t attr)
{
int i;
if (!(c->flags & (1 << attr)))
return;
switch (attr) {
case NFTNL_CHAIN_NAME:
xfree(c->name);
break;
case NFTNL_CHAIN_TABLE:
xfree(c->table);
break;
case NFTNL_CHAIN_USE:
break;
case NFTNL_CHAIN_TYPE:
xfree(c->type);
break;
case NFTNL_CHAIN_HOOKNUM:
case NFTNL_CHAIN_PRIO:
case NFTNL_CHAIN_POLICY:
case NFTNL_CHAIN_BYTES:
case NFTNL_CHAIN_PACKETS:
case NFTNL_CHAIN_HANDLE:
case NFTNL_CHAIN_FAMILY:
case NFTNL_CHAIN_FLAGS:
case NFTNL_CHAIN_ID:
break;
case NFTNL_CHAIN_DEV:
xfree(c->dev);
break;
case NFTNL_CHAIN_DEVICES:
for (i = 0; i < c->dev_array_len; i++)
xfree(c->dev_array[i]);
xfree(c->dev_array);
break;
default:
return;
}
c->flags &= ~(1 << attr);
}
static uint32_t nftnl_chain_validate[NFTNL_CHAIN_MAX + 1] = {
[NFTNL_CHAIN_HOOKNUM] = sizeof(uint32_t),
[NFTNL_CHAIN_PRIO] = sizeof(int32_t),
[NFTNL_CHAIN_POLICY] = sizeof(uint32_t),
[NFTNL_CHAIN_BYTES] = sizeof(uint64_t),
[NFTNL_CHAIN_PACKETS] = sizeof(uint64_t),
[NFTNL_CHAIN_HANDLE] = sizeof(uint64_t),
[NFTNL_CHAIN_FAMILY] = sizeof(uint32_t),
[NFTNL_CHAIN_FLAGS] = sizeof(uint32_t),
[NFTNL_CHAIN_ID] = sizeof(uint32_t),
};
EXPORT_SYMBOL(nftnl_chain_set_data);
int nftnl_chain_set_data(struct nftnl_chain *c, uint16_t attr,
const void *data, uint32_t data_len)
{
const char **dev_array;
int len = 0, i;
nftnl_assert_attr_exists(attr, NFTNL_CHAIN_MAX);
nftnl_assert_validate(data, nftnl_chain_validate, attr, data_len);
switch(attr) {
case NFTNL_CHAIN_NAME:
if (c->flags & (1 << NFTNL_CHAIN_NAME))
xfree(c->name);
c->name = strdup(data);
if (!c->name)
return -1;
break;
case NFTNL_CHAIN_TABLE:
if (c->flags & (1 << NFTNL_CHAIN_TABLE))
xfree(c->table);
c->table = strdup(data);
if (!c->table)
return -1;
break;
case NFTNL_CHAIN_HOOKNUM:
memcpy(&c->hooknum, data, sizeof(c->hooknum));
break;
case NFTNL_CHAIN_PRIO:
memcpy(&c->prio, data, sizeof(c->prio));
break;
case NFTNL_CHAIN_POLICY:
memcpy(&c->policy, data, sizeof(c->policy));
break;
case NFTNL_CHAIN_USE:
memcpy(&c->use, data, sizeof(c->use));
break;
case NFTNL_CHAIN_BYTES:
memcpy(&c->bytes, data, sizeof(c->bytes));
break;
case NFTNL_CHAIN_PACKETS:
memcpy(&c->packets, data, sizeof(c->packets));
break;
case NFTNL_CHAIN_HANDLE:
memcpy(&c->handle, data, sizeof(c->handle));
break;
case NFTNL_CHAIN_FAMILY:
memcpy(&c->family, data, sizeof(c->family));
break;
case NFTNL_CHAIN_TYPE:
if (c->flags & (1 << NFTNL_CHAIN_TYPE))
xfree(c->type);
c->type = strdup(data);
if (!c->type)
return -1;
break;
case NFTNL_CHAIN_DEV:
if (c->flags & (1 << NFTNL_CHAIN_DEV))
xfree(c->dev);
c->dev = strdup(data);
if (!c->dev)
return -1;
break;
case NFTNL_CHAIN_DEVICES:
dev_array = (const char **)data;
while (dev_array[len] != NULL)
len++;
if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
for (i = 0; i < c->dev_array_len; i++)
xfree(c->dev_array[i]);
xfree(c->dev_array);
}
c->dev_array = calloc(len + 1, sizeof(char *));
if (!c->dev_array)
return -1;
for (i = 0; i < len; i++)
c->dev_array[i] = strdup(dev_array[i]);
c->dev_array_len = len;
break;
case NFTNL_CHAIN_FLAGS:
memcpy(&c->chain_flags, data, sizeof(c->chain_flags));
break;
case NFTNL_CHAIN_ID:
memcpy(&c->chain_id, data, sizeof(c->chain_id));
break;
case NFTNL_CHAIN_USERDATA:
if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
xfree(c->user.data);
c->user.data = malloc(data_len);
if (!c->user.data)
return -1;
memcpy(c->user.data, data, data_len);
c->user.len = data_len;
break;
}
c->flags |= (1 << attr);
return 0;
}
void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data) __visible;
void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data)
{
nftnl_chain_set_data(c, attr, data, nftnl_chain_validate[attr]);
}
EXPORT_SYMBOL(nftnl_chain_set_u32);
void nftnl_chain_set_u32(struct nftnl_chain *c, uint16_t attr, uint32_t data)
{
nftnl_chain_set_data(c, attr, &data, sizeof(uint32_t));
}
EXPORT_SYMBOL(nftnl_chain_set_s32);
void nftnl_chain_set_s32(struct nftnl_chain *c, uint16_t attr, int32_t data)
{
nftnl_chain_set_data(c, attr, &data, sizeof(int32_t));
}
EXPORT_SYMBOL(nftnl_chain_set_u64);
void nftnl_chain_set_u64(struct nftnl_chain *c, uint16_t attr, uint64_t data)
{
nftnl_chain_set_data(c, attr, &data, sizeof(uint64_t));
}
EXPORT_SYMBOL(nftnl_chain_set_u8);
void nftnl_chain_set_u8(struct nftnl_chain *c, uint16_t attr, uint8_t data)
{
nftnl_chain_set_data(c, attr, &data, sizeof(uint8_t));
}
EXPORT_SYMBOL(nftnl_chain_set_str);
int nftnl_chain_set_str(struct nftnl_chain *c, uint16_t attr, const char *str)
{
return nftnl_chain_set_data(c, attr, str, strlen(str) + 1);
}
EXPORT_SYMBOL(nftnl_chain_set_array);
int nftnl_chain_set_array(struct nftnl_chain *c, uint16_t attr,
const char **data)
{
return nftnl_chain_set_data(c, attr, data, 0);
}
EXPORT_SYMBOL(nftnl_chain_get_data);
const void *nftnl_chain_get_data(const struct nftnl_chain *c, uint16_t attr,
uint32_t *data_len)
{
if (!(c->flags & (1 << attr)))
return NULL;
switch(attr) {
case NFTNL_CHAIN_NAME:
*data_len = strlen(c->name) + 1;
return c->name;
case NFTNL_CHAIN_TABLE:
*data_len = strlen(c->table) + 1;
return c->table;
case NFTNL_CHAIN_HOOKNUM:
*data_len = sizeof(uint32_t);
return &c->hooknum;
case NFTNL_CHAIN_PRIO:
*data_len = sizeof(int32_t);
return &c->prio;
case NFTNL_CHAIN_POLICY:
*data_len = sizeof(uint32_t);
return &c->policy;
case NFTNL_CHAIN_USE:
*data_len = sizeof(uint32_t);
return &c->use;
case NFTNL_CHAIN_BYTES:
*data_len = sizeof(uint64_t);
return &c->bytes;
case NFTNL_CHAIN_PACKETS:
*data_len = sizeof(uint64_t);
return &c->packets;
case NFTNL_CHAIN_HANDLE:
*data_len = sizeof(uint64_t);
return &c->handle;
case NFTNL_CHAIN_FAMILY:
*data_len = sizeof(uint32_t);
return &c->family;
case NFTNL_CHAIN_TYPE:
*data_len = sizeof(uint32_t);
return c->type;
case NFTNL_CHAIN_DEV:
*data_len = strlen(c->dev) + 1;
return c->dev;
case NFTNL_CHAIN_DEVICES:
*data_len = 0;
return &c->dev_array[0];
case NFTNL_CHAIN_FLAGS:
*data_len = sizeof(uint32_t);
return &c->chain_flags;
case NFTNL_CHAIN_ID:
*data_len = sizeof(uint32_t);
return &c->chain_id;
case NFTNL_CHAIN_USERDATA:
*data_len = c->user.len;
return c->user.data;
}
return NULL;
}
EXPORT_SYMBOL(nftnl_chain_get);
const void *nftnl_chain_get(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
return nftnl_chain_get_data(c, attr, &data_len);
}
EXPORT_SYMBOL(nftnl_chain_get_str);
const char *nftnl_chain_get_str(const struct nftnl_chain *c, uint16_t attr)
{
return nftnl_chain_get(c, attr);
}
EXPORT_SYMBOL(nftnl_chain_get_u32);
uint32_t nftnl_chain_get_u32(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
const uint32_t *val = nftnl_chain_get_data(c, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(uint32_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_chain_get_s32);
int32_t nftnl_chain_get_s32(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
const int32_t *val = nftnl_chain_get_data(c, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(int32_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_chain_get_u64);
uint64_t nftnl_chain_get_u64(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
const uint64_t *val = nftnl_chain_get_data(c, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(int64_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_chain_get_u8);
uint8_t nftnl_chain_get_u8(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
const uint8_t *val = nftnl_chain_get_data(c, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(int8_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_chain_get_array);
const char *const *nftnl_chain_get_array(const struct nftnl_chain *c, uint16_t attr)
{
uint32_t data_len;
const char * const *val = nftnl_chain_get_data(c, attr, &data_len);
nftnl_assert(val, attr, attr == NFTNL_CHAIN_DEVICES);
return val;
}
EXPORT_SYMBOL(nftnl_chain_nlmsg_build_payload);
void nftnl_chain_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_chain *c)
{
int i;
if (c->flags & (1 << NFTNL_CHAIN_TABLE))
mnl_attr_put_strz(nlh, NFTA_CHAIN_TABLE, c->table);
if (c->flags & (1 << NFTNL_CHAIN_NAME))
mnl_attr_put_strz(nlh, NFTA_CHAIN_NAME, c->name);
if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) &&
(c->flags & (1 << NFTNL_CHAIN_PRIO))) {
struct nlattr *nest;
nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_HOOK);
mnl_attr_put_u32(nlh, NFTA_HOOK_HOOKNUM, htonl(c->hooknum));
mnl_attr_put_u32(nlh, NFTA_HOOK_PRIORITY, htonl(c->prio));
if (c->flags & (1 << NFTNL_CHAIN_DEV))
mnl_attr_put_strz(nlh, NFTA_HOOK_DEV, c->dev);
else if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
struct nlattr *nest_dev;
nest_dev = mnl_attr_nest_start(nlh, NFTA_HOOK_DEVS);
for (i = 0; i < c->dev_array_len; i++)
mnl_attr_put_strz(nlh, NFTA_DEVICE_NAME,
c->dev_array[i]);
mnl_attr_nest_end(nlh, nest_dev);
}
mnl_attr_nest_end(nlh, nest);
}
if (c->flags & (1 << NFTNL_CHAIN_POLICY))
mnl_attr_put_u32(nlh, NFTA_CHAIN_POLICY, htonl(c->policy));
if (c->flags & (1 << NFTNL_CHAIN_USE))
mnl_attr_put_u32(nlh, NFTA_CHAIN_USE, htonl(c->use));
if ((c->flags & (1 << NFTNL_CHAIN_PACKETS)) &&
(c->flags & (1 << NFTNL_CHAIN_BYTES))) {
struct nlattr *nest;
nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_COUNTERS);
mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, be64toh(c->packets));
mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, be64toh(c->bytes));
mnl_attr_nest_end(nlh, nest);
}
if (c->flags & (1 << NFTNL_CHAIN_HANDLE))
mnl_attr_put_u64(nlh, NFTA_CHAIN_HANDLE, be64toh(c->handle));
if (c->flags & (1 << NFTNL_CHAIN_TYPE))
mnl_attr_put_strz(nlh, NFTA_CHAIN_TYPE, c->type);
if (c->flags & (1 << NFTNL_CHAIN_FLAGS))
mnl_attr_put_u32(nlh, NFTA_CHAIN_FLAGS, htonl(c->chain_flags));
if (c->flags & (1 << NFTNL_CHAIN_ID))
mnl_attr_put_u32(nlh, NFTA_CHAIN_ID, htonl(c->chain_id));
if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
mnl_attr_put(nlh, NFTA_CHAIN_USERDATA, c->user.len, c->user.data);
}
EXPORT_SYMBOL(nftnl_chain_rule_add);
void nftnl_chain_rule_add(struct nftnl_rule *rule, struct nftnl_chain *c)
{
list_add(&rule->head, &c->rule_list);
}
EXPORT_SYMBOL(nftnl_chain_rule_del);
void nftnl_chain_rule_del(struct nftnl_rule *r)
{
list_del(&r->head);
}
EXPORT_SYMBOL(nftnl_chain_rule_add_tail);
void nftnl_chain_rule_add_tail(struct nftnl_rule *rule, struct nftnl_chain *c)
{
list_add_tail(&rule->head, &c->rule_list);
}
EXPORT_SYMBOL(nftnl_chain_rule_insert_at);
void nftnl_chain_rule_insert_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
{
list_add_tail(&rule->head, &pos->head);
}
EXPORT_SYMBOL(nftnl_chain_rule_append_at);
void nftnl_chain_rule_append_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
{
list_add(&rule->head, &pos->head);
}
static int nftnl_chain_parse_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_CHAIN_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_CHAIN_NAME:
case NFTA_CHAIN_TABLE:
case NFTA_CHAIN_TYPE:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_CHAIN_HOOK:
case NFTA_CHAIN_COUNTERS:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
case NFTA_CHAIN_POLICY:
case NFTA_CHAIN_USE:
case NFTA_CHAIN_FLAGS:
case NFTA_CHAIN_ID:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_CHAIN_HANDLE:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_CHAIN_USERDATA:
if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_chain_parse_counters_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_COUNTER_BYTES:
case NFTA_COUNTER_PACKETS:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_chain_parse_counters(struct nlattr *attr, struct nftnl_chain *c)
{
struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
if (mnl_attr_parse_nested(attr, nftnl_chain_parse_counters_cb, tb) < 0)
return -1;
if (tb[NFTA_COUNTER_PACKETS]) {
c->packets = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
c->flags |= (1 << NFTNL_CHAIN_PACKETS);
}
if (tb[NFTA_COUNTER_BYTES]) {
c->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
c->flags |= (1 << NFTNL_CHAIN_BYTES);
}
return 0;
}
static int nftnl_chain_parse_hook_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_HOOK_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_HOOK_HOOKNUM:
case NFTA_HOOK_PRIORITY:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_HOOK_DEV:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_chain_parse_devs(struct nlattr *nest, struct nftnl_chain *c)
{
const char **dev_array, **tmp;
int len = 0, size = 8;
struct nlattr *attr;
dev_array = calloc(8, sizeof(char *));
if (!dev_array)
return -1;
mnl_attr_for_each_nested(attr, nest) {
if (mnl_attr_get_type(attr) != NFTA_DEVICE_NAME)
goto err;
dev_array[len++] = strdup(mnl_attr_get_str(attr));
if (len >= size) {
tmp = realloc(dev_array, size * 2 * sizeof(char *));
if (!tmp)
goto err;
size *= 2;
memset(&tmp[len], 0, (size - len) * sizeof(char *));
dev_array = tmp;
}
}
c->dev_array = dev_array;
c->dev_array_len = len;
return 0;
err:
while (len--)
xfree(dev_array[len]);
xfree(dev_array);
return -1;
}
static int nftnl_chain_parse_hook(struct nlattr *attr, struct nftnl_chain *c)
{
struct nlattr *tb[NFTA_HOOK_MAX+1] = {};
int ret;
if (mnl_attr_parse_nested(attr, nftnl_chain_parse_hook_cb, tb) < 0)
return -1;
if (tb[NFTA_HOOK_HOOKNUM]) {
c->hooknum = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_HOOKNUM]));
c->flags |= (1 << NFTNL_CHAIN_HOOKNUM);
}
if (tb[NFTA_HOOK_PRIORITY]) {
c->prio = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_PRIORITY]));
c->flags |= (1 << NFTNL_CHAIN_PRIO);
}
if (tb[NFTA_HOOK_DEV]) {
c->dev = strdup(mnl_attr_get_str(tb[NFTA_HOOK_DEV]));
if (!c->dev)
return -1;
c->flags |= (1 << NFTNL_CHAIN_DEV);
}
if (tb[NFTA_HOOK_DEVS]) {
ret = nftnl_chain_parse_devs(tb[NFTA_HOOK_DEVS], c);
if (ret < 0)
return -1;
c->flags |= (1 << NFTNL_CHAIN_DEVICES);
}
return 0;
}
EXPORT_SYMBOL(nftnl_chain_nlmsg_parse);
int nftnl_chain_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_chain *c)
{
struct nlattr *tb[NFTA_CHAIN_MAX+1] = {};
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
int ret = 0;
if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_chain_parse_attr_cb, tb) < 0)
return -1;
if (tb[NFTA_CHAIN_NAME]) {
if (c->flags & (1 << NFTNL_CHAIN_NAME))
xfree(c->name);
c->name = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_NAME]));
if (!c->name)
return -1;
c->flags |= (1 << NFTNL_CHAIN_NAME);
}
if (tb[NFTA_CHAIN_TABLE]) {
if (c->flags & (1 << NFTNL_CHAIN_TABLE))
xfree(c->table);
c->table = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_TABLE]));
if (!c->table)
return -1;
c->flags |= (1 << NFTNL_CHAIN_TABLE);
}
if (tb[NFTA_CHAIN_HOOK]) {
ret = nftnl_chain_parse_hook(tb[NFTA_CHAIN_HOOK], c);
if (ret < 0)
return ret;
}
if (tb[NFTA_CHAIN_POLICY]) {
c->policy = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_POLICY]));
c->flags |= (1 << NFTNL_CHAIN_POLICY);
}
if (tb[NFTA_CHAIN_USE]) {
c->use = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_USE]));
c->flags |= (1 << NFTNL_CHAIN_USE);
}
if (tb[NFTA_CHAIN_COUNTERS]) {
ret = nftnl_chain_parse_counters(tb[NFTA_CHAIN_COUNTERS], c);
if (ret < 0)
return ret;
}
if (tb[NFTA_CHAIN_HANDLE]) {
c->handle = be64toh(mnl_attr_get_u64(tb[NFTA_CHAIN_HANDLE]));
c->flags |= (1 << NFTNL_CHAIN_HANDLE);
}
if (tb[NFTA_CHAIN_TYPE]) {
if (c->flags & (1 << NFTNL_CHAIN_TYPE))
xfree(c->type);
c->type = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_TYPE]));
if (!c->type)
return -1;
c->flags |= (1 << NFTNL_CHAIN_TYPE);
}
if (tb[NFTA_CHAIN_FLAGS]) {
c->chain_flags = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_FLAGS]));
c->flags |= (1 << NFTNL_CHAIN_FLAGS);
}
if (tb[NFTA_CHAIN_ID]) {
c->chain_id = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_ID]));
c->flags |= (1 << NFTNL_CHAIN_ID);
}
if (tb[NFTA_CHAIN_USERDATA]) {
nftnl_chain_set_data(c, NFTNL_CHAIN_USERDATA,
mnl_attr_get_payload(tb[NFTA_CHAIN_USERDATA]),
mnl_attr_get_payload_len(tb[NFTA_CHAIN_USERDATA]));
}
c->family = nfg->nfgen_family;
c->flags |= (1 << NFTNL_CHAIN_FAMILY);
return ret;
}
static inline int nftnl_str2hooknum(int family, const char *hook)
{
int hooknum;
for (hooknum = 0; hooknum < NF_INET_NUMHOOKS; hooknum++) {
if (strcmp(hook, nftnl_hooknum2str(family, hooknum)) == 0)
return hooknum;
}
return -1;
}
static int nftnl_chain_snprintf_default(char *buf, size_t size,
const struct nftnl_chain *c)
{
int ret, remain = size, offset = 0, i;
ret = snprintf(buf, remain, "%s %s %s use %u",
nftnl_family2str(c->family), c->table, c->name, c->use);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) {
ret = snprintf(buf + offset, remain, " type %s hook %s prio %d",
c->type, nftnl_hooknum2str(c->family, c->hooknum),
c->prio);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (c->flags & (1 << NFTNL_CHAIN_POLICY)) {
ret = snprintf(buf + offset, remain, " policy %s",
nftnl_verdict2str(c->policy));
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, remain,
" packets %"PRIu64" bytes %"PRIu64"",
c->packets, c->bytes);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (c->flags & (1 << NFTNL_CHAIN_DEV)) {
ret = snprintf(buf + offset, remain, " dev %s ",
c->dev);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
ret = snprintf(buf + offset, remain, " dev { ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
for (i = 0; i < c->dev_array_len; i++) {
ret = snprintf(buf + offset, remain, " %s ",
c->dev_array[i]);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, remain, " } ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (c->flags & (1 << NFTNL_CHAIN_FLAGS)) {
ret = snprintf(buf + offset, remain, " flags %x",
c->chain_flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (c->flags & (1 << NFTNL_CHAIN_ID)) {
ret = snprintf(buf + offset, remain, " id %x",
c->chain_id);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
}
return offset;
}
static int nftnl_chain_cmd_snprintf(char *buf, size_t size,
const struct nftnl_chain *c, uint32_t cmd,
uint32_t type, uint32_t flags)
{
int ret, remain = size, offset = 0;
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
ret = nftnl_chain_snprintf_default(buf + offset, remain, c);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
break;
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
default:
return -1;
}
return offset;
}
EXPORT_SYMBOL(nftnl_chain_snprintf);
int nftnl_chain_snprintf(char *buf, size_t size, const struct nftnl_chain *c,
uint32_t type, uint32_t flags)
{
if (size)
buf[0] = '\0';
return nftnl_chain_cmd_snprintf(buf, size, c, nftnl_flag2cmd(flags),
type, flags);
}
static int nftnl_chain_do_snprintf(char *buf, size_t size, const void *c,
uint32_t cmd, uint32_t type, uint32_t flags)
{
return nftnl_chain_snprintf(buf, size, c, type, flags);
}
EXPORT_SYMBOL(nftnl_chain_fprintf);
int nftnl_chain_fprintf(FILE *fp, const struct nftnl_chain *c, uint32_t type,
uint32_t flags)
{
return nftnl_fprintf(fp, c, NFTNL_CMD_UNSPEC, type, flags,
nftnl_chain_do_snprintf);
}
EXPORT_SYMBOL(nftnl_rule_foreach);
int nftnl_rule_foreach(struct nftnl_chain *c,
int (*cb)(struct nftnl_rule *r, void *data),
void *data)
{
struct nftnl_rule *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &c->rule_list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL(nftnl_rule_lookup_byindex);
struct nftnl_rule *
nftnl_rule_lookup_byindex(struct nftnl_chain *c, uint32_t index)
{
struct nftnl_rule *r;
list_for_each_entry(r, &c->rule_list, head) {
if (!index)
return r;
index--;
}
return NULL;
}
struct nftnl_rule_iter {
const struct nftnl_chain *c;
struct nftnl_rule *cur;
};
static void nftnl_rule_iter_init(const struct nftnl_chain *c,
struct nftnl_rule_iter *iter)
{
iter->c = c;
if (list_empty(&c->rule_list))
iter->cur = NULL;
else
iter->cur = list_entry(c->rule_list.next, struct nftnl_rule,
head);
}
EXPORT_SYMBOL(nftnl_rule_iter_create);
struct nftnl_rule_iter *nftnl_rule_iter_create(const struct nftnl_chain *c)
{
struct nftnl_rule_iter *iter;
iter = calloc(1, sizeof(struct nftnl_rule_iter));
if (iter == NULL)
return NULL;
nftnl_rule_iter_init(c, iter);
return iter;
}
EXPORT_SYMBOL(nftnl_rule_iter_next);
struct nftnl_rule *nftnl_rule_iter_next(struct nftnl_rule_iter *iter)
{
struct nftnl_rule *rule = iter->cur;
if (rule == NULL)
return NULL;
/* get next rule, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_rule, head);
if (&iter->cur->head == iter->c->rule_list.next)
return NULL;
return rule;
}
EXPORT_SYMBOL(nftnl_rule_iter_destroy);
void nftnl_rule_iter_destroy(struct nftnl_rule_iter *iter)
{
xfree(iter);
}
#define CHAIN_NAME_HSIZE 512
struct nftnl_chain_list {
struct list_head list;
struct hlist_head name_hash[CHAIN_NAME_HSIZE];
};
EXPORT_SYMBOL(nftnl_chain_list_alloc);
struct nftnl_chain_list *nftnl_chain_list_alloc(void)
{
struct nftnl_chain_list *list;
int i;
list = calloc(1, sizeof(struct nftnl_chain_list));
if (list == NULL)
return NULL;
INIT_LIST_HEAD(&list->list);
for (i = 0; i < CHAIN_NAME_HSIZE; i++)
INIT_HLIST_HEAD(&list->name_hash[i]);
return list;
}
EXPORT_SYMBOL(nftnl_chain_list_free);
void nftnl_chain_list_free(struct nftnl_chain_list *list)
{
struct nftnl_chain *r, *tmp;
list_for_each_entry_safe(r, tmp, &list->list, head) {
list_del(&r->head);
hlist_del(&r->hnode);
nftnl_chain_free(r);
}
xfree(list);
}
EXPORT_SYMBOL(nftnl_chain_list_is_empty);
int nftnl_chain_list_is_empty(const struct nftnl_chain_list *list)
{
return list_empty(&list->list);
}
static uint32_t djb_hash(const char *key)
{
uint32_t i, hash = 5381;
for (i = 0; i < strlen(key); i++)
hash = ((hash << 5) + hash) + key[i];
return hash;
}
EXPORT_SYMBOL(nftnl_chain_list_add);
void nftnl_chain_list_add(struct nftnl_chain *r, struct nftnl_chain_list *list)
{
int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
hlist_add_head(&r->hnode, &list->name_hash[key]);
list_add(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_chain_list_add_tail);
void nftnl_chain_list_add_tail(struct nftnl_chain *r, struct nftnl_chain_list *list)
{
int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
hlist_add_head(&r->hnode, &list->name_hash[key]);
list_add_tail(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_chain_list_del);
void nftnl_chain_list_del(struct nftnl_chain *r)
{
list_del(&r->head);
hlist_del(&r->hnode);
}
EXPORT_SYMBOL(nftnl_chain_list_foreach);
int nftnl_chain_list_foreach(struct nftnl_chain_list *chain_list,
int (*cb)(struct nftnl_chain *r, void *data),
void *data)
{
struct nftnl_chain *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &chain_list->list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL(nftnl_chain_list_lookup_byname);
struct nftnl_chain *
nftnl_chain_list_lookup_byname(struct nftnl_chain_list *chain_list,
const char *chain)
{
int key = djb_hash(chain) % CHAIN_NAME_HSIZE;
struct nftnl_chain *c;
struct hlist_node *n;
hlist_for_each_entry(c, n, &chain_list->name_hash[key], hnode) {
if (!strcmp(chain, c->name))
return c;
}
return NULL;
}
struct nftnl_chain_list_iter {
const struct nftnl_chain_list *list;
struct nftnl_chain *cur;
};
EXPORT_SYMBOL(nftnl_chain_list_iter_create);
struct nftnl_chain_list_iter *
nftnl_chain_list_iter_create(const struct nftnl_chain_list *l)
{
struct nftnl_chain_list_iter *iter;
iter = calloc(1, sizeof(struct nftnl_chain_list_iter));
if (iter == NULL)
return NULL;
iter->list = l;
if (nftnl_chain_list_is_empty(l))
iter->cur = NULL;
else
iter->cur = list_entry(l->list.next, struct nftnl_chain, head);
return iter;
}
EXPORT_SYMBOL(nftnl_chain_list_iter_next);
struct nftnl_chain *nftnl_chain_list_iter_next(struct nftnl_chain_list_iter *iter)
{
struct nftnl_chain *r = iter->cur;
if (r == NULL)
return NULL;
/* get next chain, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_chain, head);
if (&iter->cur->head == iter->list->list.next)
return NULL;
return r;
}
EXPORT_SYMBOL(nftnl_chain_list_iter_destroy);
void nftnl_chain_list_iter_destroy(struct nftnl_chain_list_iter *iter)
{
xfree(iter);
}
nftnl_chain_list_iter
Definition: chain.c:1125
nftnl_chain_list
Definition: chain.c:1016
nftnl_chain
Definition: chain.c:32
nftnl_rule_iter
Definition: chain.c:962