dynset.c
/*
* Copyright (c) 2014, 2015 Patrick McHardy <kaber@trash.net>
*
* 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 "internal.h"
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <errno.h>
#include <arpa/inet.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/rule.h>
#include <libnftnl/expr.h>
#include "data_reg.h"
#include "expr_ops.h"
struct nftnl_expr_dynset {
enum nft_registers sreg_key;
enum nft_registers sreg_data;
enum nft_dynset_ops op;
uint64_t timeout;
struct list_head expr_list;
char *set_name;
uint32_t set_id;
uint32_t dynset_flags;
};
static int
nftnl_expr_dynset_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nftnl_expr *expr, *next;
switch (type) {
case NFTNL_EXPR_DYNSET_SREG_KEY:
memcpy(&dynset->sreg_key, data, sizeof(dynset->sreg_key));
break;
case NFTNL_EXPR_DYNSET_SREG_DATA:
memcpy(&dynset->sreg_data, data, sizeof(dynset->sreg_data));
break;
case NFTNL_EXPR_DYNSET_OP:
memcpy(&dynset->op, data, sizeof(dynset->op));
break;
case NFTNL_EXPR_DYNSET_TIMEOUT:
memcpy(&dynset->timeout, data, sizeof(dynset->timeout));
break;
case NFTNL_EXPR_DYNSET_SET_NAME:
dynset->set_name = strdup((const char *)data);
if (!dynset->set_name)
return -1;
break;
case NFTNL_EXPR_DYNSET_SET_ID:
memcpy(&dynset->set_id, data, sizeof(dynset->set_id));
break;
case NFTNL_EXPR_DYNSET_EXPR:
list_for_each_entry_safe(expr, next, &dynset->expr_list, head)
nftnl_expr_free(expr);
expr = (void *)data;
list_add(&expr->head, &dynset->expr_list);
break;
case NFTNL_EXPR_DYNSET_FLAGS:
memcpy(&dynset->dynset_flags, data, sizeof(dynset->dynset_flags));
break;
default:
return -1;
}
return 0;
}
static const void *
nftnl_expr_dynset_get(const struct nftnl_expr *e, uint16_t type,
uint32_t *data_len)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nftnl_expr *expr;
switch (type) {
case NFTNL_EXPR_DYNSET_SREG_KEY:
*data_len = sizeof(dynset->sreg_key);
return &dynset->sreg_key;
case NFTNL_EXPR_DYNSET_SREG_DATA:
*data_len = sizeof(dynset->sreg_data);
return &dynset->sreg_data;
case NFTNL_EXPR_DYNSET_OP:
*data_len = sizeof(dynset->op);
return &dynset->op;
case NFTNL_EXPR_DYNSET_TIMEOUT:
*data_len = sizeof(dynset->timeout);
return &dynset->timeout;
case NFTNL_EXPR_DYNSET_SET_NAME:
*data_len = strlen(dynset->set_name) + 1;
return dynset->set_name;
case NFTNL_EXPR_DYNSET_SET_ID:
*data_len = sizeof(dynset->set_id);
return &dynset->set_id;
case NFTNL_EXPR_DYNSET_EXPR:
list_for_each_entry(expr, &dynset->expr_list, head)
break;
return expr;
case NFTNL_EXPR_DYNSET_FLAGS:
*data_len = sizeof(dynset->dynset_flags);
return &dynset->dynset_flags;
}
return NULL;
}
static int nftnl_expr_dynset_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_SET_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_DYNSET_SREG_KEY:
case NFTA_DYNSET_SREG_DATA:
case NFTA_DYNSET_SET_ID:
case NFTA_DYNSET_OP:
case NFTA_DYNSET_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_DYNSET_TIMEOUT:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_DYNSET_SET_NAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_DYNSET_EXPR:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_expr_dynset_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nlattr *nest;
int num_exprs = 0;
if (e->flags & (1 << NFTNL_EXPR_DYNSET_SREG_KEY))
mnl_attr_put_u32(nlh, NFTA_DYNSET_SREG_KEY, htonl(dynset->sreg_key));
if (e->flags & (1 << NFTNL_EXPR_DYNSET_SREG_DATA))
mnl_attr_put_u32(nlh, NFTA_DYNSET_SREG_DATA, htonl(dynset->sreg_data));
if (e->flags & (1 << NFTNL_EXPR_DYNSET_OP))
mnl_attr_put_u32(nlh, NFTA_DYNSET_OP, htonl(dynset->op));
if (e->flags & (1 << NFTNL_EXPR_DYNSET_TIMEOUT))
mnl_attr_put_u64(nlh, NFTA_DYNSET_TIMEOUT, htobe64(dynset->timeout));
if (e->flags & (1 << NFTNL_EXPR_DYNSET_SET_NAME))
mnl_attr_put_strz(nlh, NFTA_DYNSET_SET_NAME, dynset->set_name);
if (e->flags & (1 << NFTNL_EXPR_DYNSET_SET_ID))
mnl_attr_put_u32(nlh, NFTA_DYNSET_SET_ID, htonl(dynset->set_id));
if (!list_empty(&dynset->expr_list)) {
struct nftnl_expr *expr;
list_for_each_entry(expr, &dynset->expr_list, head)
num_exprs++;
if (num_exprs == 1) {
nest = mnl_attr_nest_start(nlh, NFTA_DYNSET_EXPR);
list_for_each_entry(expr, &dynset->expr_list, head)
nftnl_expr_build_payload(nlh, expr);
mnl_attr_nest_end(nlh, nest);
} else if (num_exprs > 1) {
struct nlattr *nest1, *nest2;
nest1 = mnl_attr_nest_start(nlh, NFTA_DYNSET_EXPRESSIONS);
list_for_each_entry(expr, &dynset->expr_list, head) {
nest2 = mnl_attr_nest_start(nlh, NFTA_LIST_ELEM);
nftnl_expr_build_payload(nlh, expr);
mnl_attr_nest_end(nlh, nest2);
}
mnl_attr_nest_end(nlh, nest1);
}
}
if (e->flags & (1 << NFTNL_EXPR_DYNSET_FLAGS))
mnl_attr_put_u32(nlh, NFTA_DYNSET_FLAGS,
htonl(dynset->dynset_flags));
}
EXPORT_SYMBOL(nftnl_expr_add_expr);
void nftnl_expr_add_expr(struct nftnl_expr *e, uint32_t type,
struct nftnl_expr *expr)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
list_add_tail(&expr->head, &dynset->expr_list);
}
EXPORT_SYMBOL(nftnl_expr_expr_foreach);
int nftnl_expr_expr_foreach(const struct nftnl_expr *e,
int (*cb)(struct nftnl_expr *e, void *data),
void *data)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nftnl_expr *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &dynset->expr_list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
static int
nftnl_expr_dynset_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nlattr *tb[NFTA_SET_MAX+1] = {};
struct nftnl_expr *expr, *next;
int ret = 0;
if (mnl_attr_parse_nested(attr, nftnl_expr_dynset_cb, tb) < 0)
return -1;
if (tb[NFTA_DYNSET_SREG_KEY]) {
dynset->sreg_key = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SREG_KEY]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_SREG_KEY);
}
if (tb[NFTA_DYNSET_SREG_DATA]) {
dynset->sreg_data = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SREG_DATA]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_SREG_DATA);
}
if (tb[NFTA_DYNSET_OP]) {
dynset->op = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_OP]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_OP);
}
if (tb[NFTA_DYNSET_TIMEOUT]) {
dynset->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_DYNSET_TIMEOUT]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_TIMEOUT);
}
if (tb[NFTA_DYNSET_SET_NAME]) {
dynset->set_name =
strdup(mnl_attr_get_str(tb[NFTA_DYNSET_SET_NAME]));
if (!dynset->set_name)
return -1;
e->flags |= (1 << NFTNL_EXPR_DYNSET_SET_NAME);
}
if (tb[NFTA_DYNSET_SET_ID]) {
dynset->set_id = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SET_ID]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_SET_ID);
}
if (tb[NFTA_DYNSET_EXPR]) {
expr = nftnl_expr_parse(tb[NFTA_DYNSET_EXPR]);
if (expr == NULL)
return -1;
list_add(&expr->head, &dynset->expr_list);
e->flags |= (1 << NFTNL_EXPR_DYNSET_EXPR);
} else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
struct nlattr *attr2;
mnl_attr_for_each_nested(attr2, tb[NFTA_DYNSET_EXPRESSIONS]) {
if (mnl_attr_get_type(attr2) != NFTA_LIST_ELEM)
goto out_dynset_expr;
expr = nftnl_expr_parse(attr2);
if (!expr)
goto out_dynset_expr;
list_add_tail(&expr->head, &dynset->expr_list);
}
e->flags |= (1 << NFTNL_EXPR_DYNSET_EXPRESSIONS);
}
if (tb[NFTA_DYNSET_FLAGS]) {
dynset->dynset_flags = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_FLAGS]));
e->flags |= (1 << NFTNL_EXPR_DYNSET_FLAGS);
}
return ret;
out_dynset_expr:
list_for_each_entry_safe(expr, next, &dynset->expr_list, head)
nftnl_expr_free(expr);
return -1;
}
static const char *op2str_array[] = {
[NFT_DYNSET_OP_ADD] = "add",
[NFT_DYNSET_OP_UPDATE] = "update",
[NFT_DYNSET_OP_DELETE] = "delete",
};
static const char *op2str(enum nft_dynset_ops op)
{
if (op > NFT_DYNSET_OP_DELETE)
return "unknown";
return op2str_array[op];
}
static int
nftnl_expr_dynset_snprintf_default(char *buf, size_t size,
const struct nftnl_expr *e)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nftnl_expr *expr;
int remain = size, offset = 0, ret;
ret = snprintf(buf, remain, "%s reg_key %u set %s ",
op2str(dynset->op), dynset->sreg_key, dynset->set_name);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (e->flags & (1 << NFTNL_EXPR_DYNSET_SREG_DATA)) {
ret = snprintf(buf + offset, remain, "sreg_data %u ",
dynset->sreg_data);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_EXPR_DYNSET_TIMEOUT)) {
ret = snprintf(buf + offset, remain, "timeout %"PRIu64"ms ",
dynset->timeout);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
list_for_each_entry(expr, &dynset->expr_list, head) {
ret = snprintf(buf + offset, remain, "expr [ %s ",
expr->ops->name);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_expr_snprintf(buf + offset, remain, expr,
NFTNL_OUTPUT_DEFAULT,
NFTNL_OF_EVENT_ANY);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = snprintf(buf + offset, remain, "] ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
return offset;
}
static int
nftnl_expr_dynset_snprintf(char *buf, size_t size, uint32_t type,
uint32_t flags, const struct nftnl_expr *e)
{
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
return nftnl_expr_dynset_snprintf_default(buf, size, e);
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
default:
break;
}
return -1;
}
static void nftnl_expr_dynset_init(const struct nftnl_expr *e)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
INIT_LIST_HEAD(&dynset->expr_list);
}
static void nftnl_expr_dynset_free(const struct nftnl_expr *e)
{
struct nftnl_expr_dynset *dynset = nftnl_expr_data(e);
struct nftnl_expr *expr, *next;
xfree(dynset->set_name);
list_for_each_entry_safe(expr, next, &dynset->expr_list, head)
nftnl_expr_free(expr);
}
struct expr_ops expr_ops_dynset = {
.name = "dynset",
.alloc_len = sizeof(struct nftnl_expr_dynset),
.max_attr = NFTA_DYNSET_MAX,
.init = nftnl_expr_dynset_init,
.free = nftnl_expr_dynset_free,
.set = nftnl_expr_dynset_set,
.get = nftnl_expr_dynset_get,
.parse = nftnl_expr_dynset_parse,
.build = nftnl_expr_dynset_build,
.snprintf = nftnl_expr_dynset_snprintf,
};
nftnl_expr_dynset
Definition: dynset.c:24