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/*
* (C) 2012 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 software has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stddef.h> /* for offsetof */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/netfilter/nf_tables.h>
#include <libmnl/libmnl.h>
#include <libnftables/rule.h>
#include <libnftables/expr.h>
#include <linux/netfilter_ipv4/ipt_LOG.h>
#include <linux/netfilter/xt_iprange.h>
#include <netinet/ip.h>
static void add_target_log(struct nft_rule_expr *e)
{
struct ipt_log_info *info;
nft_rule_expr_set(e, NFT_EXPR_TG_NAME, "LOG", strlen("LOG"));
nft_rule_expr_set_u32(e, NFT_EXPR_TG_REV, 0);
info = calloc(1, sizeof(struct ipt_log_info));
if (info == NULL)
return;
sprintf(info->prefix, "test: ");
info->prefix[sizeof(info->prefix)-1] = '\0';
info->logflags = 0x0f;
info->level = 5;
nft_rule_expr_set(e, NFT_EXPR_TG_INFO, info, sizeof(*info));
}
static void add_expr_target(struct nft_rule *r)
{
struct nft_rule_expr *expr;
expr = nft_rule_expr_alloc("target");
if (expr == NULL)
return;
add_target_log(expr);
nft_rule_add_expr(r, expr);
}
static void add_match_iprange(struct nft_rule_expr *e)
{
struct xt_iprange_mtinfo *info;
nft_rule_expr_set(e, NFT_EXPR_MT_NAME, "iprange", strlen("iprange"));
nft_rule_expr_set_u32(e, NFT_EXPR_MT_REV, 1);
info = calloc(1, sizeof(struct xt_iprange_mtinfo));
if (info == NULL)
return;
info->src_min.ip = info->dst_min.ip = inet_addr("127.0.0.1");
info->src_max.ip = info->dst_max.ip = inet_addr("127.0.0.1");
info->flags = IPRANGE_SRC;
nft_rule_expr_set(e, NFT_EXPR_MT_INFO, info, sizeof(*info));
}
static void add_expr_match(struct nft_rule *r)
{
struct nft_rule_expr *expr;
expr = nft_rule_expr_alloc("match");
if (expr == NULL)
return;
add_match_iprange(expr);
nft_rule_add_expr(r, expr);
}
#define field_sizeof(t, f) (sizeof(((t *)NULL)->f))
static void add_payload2(struct nft_rule_expr *e)
{
nft_rule_expr_set_u32(e, NFT_EXPR_PAYLOAD_BASE,
NFT_PAYLOAD_NETWORK_HEADER);
nft_rule_expr_set_u32(e, NFT_EXPR_PAYLOAD_DREG, NFT_REG_1);
nft_rule_expr_set_u32(e, NFT_EXPR_PAYLOAD_OFFSET,
offsetof(struct iphdr, protocol));
nft_rule_expr_set_u32(e, NFT_EXPR_PAYLOAD_LEN, 1);
}
static void add_payload(struct nft_rule *r)
{
struct nft_rule_expr *expr;
expr = nft_rule_expr_alloc("payload");
if (expr == NULL)
return;
add_payload2(expr);
nft_rule_add_expr(r, expr);
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq;
struct nft_rule *r = NULL;
int ret, family;
if (argc != 4) {
fprintf(stderr, "Usage: %s <family> <table> <chain>\n",
argv[0]);
exit(EXIT_FAILURE);
}
r = nft_rule_alloc();
if (r == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
if (strcmp(argv[1], "ip") == 0)
family = AF_INET;
else if (strcmp(argv[1], "ip6") == 0)
family = AF_INET6;
else if (strcmp(argv[1], "bridge") == 0)
family = AF_BRIDGE;
else {
fprintf(stderr, "Unknown family: ip, ip6, bridge\n");
exit(EXIT_FAILURE);
}
nft_rule_attr_set(r, NFT_RULE_ATTR_TABLE, argv[2]);
nft_rule_attr_set(r, NFT_RULE_ATTR_CHAIN, argv[3]);
add_expr_match(r);
add_expr_target(r);
// add_payload(r);
char tmp[1024];
nft_rule_snprintf(tmp, sizeof(tmp), r, 0, 0);
printf("%s\n", tmp);
seq = time(NULL);
nlh = nft_rule_nlmsg_build_hdr(buf, NFT_MSG_NEWRULE, family,
NLM_F_APPEND|NLM_F_ACK|NLM_F_CREATE,
seq);
nft_rule_nlmsg_build_payload(nlh, r);
nft_rule_free(r);
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
portid = mnl_socket_get_portid(nl);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return EXIT_SUCCESS;
}
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