--- /dev/null
+/*
+ * Copyright (c) 2018 Máté Eckl <ecklm94@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 "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <limits.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_tproxy {
+ enum nft_registers sreg_addr;
+ enum nft_registers sreg_port;
+ int family;
+};
+
+static int
+nftnl_expr_tproxy_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_TPROXY_FAMILY:
+ tproxy->family = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_TPROXY_REG_ADDR:
+ tproxy->sreg_addr = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_TPROXY_REG_PORT:
+ tproxy->sreg_port = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+static const void *
+nftnl_expr_tproxy_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_TPROXY_FAMILY:
+ *data_len = sizeof(tproxy->family);
+ return &tproxy->family;
+ case NFTNL_EXPR_TPROXY_REG_ADDR:
+ *data_len = sizeof(tproxy->sreg_addr);
+ return &tproxy->sreg_addr;
+ case NFTNL_EXPR_TPROXY_REG_PORT:
+ *data_len = sizeof(tproxy->sreg_port);
+ return &tproxy->sreg_port;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_tproxy_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_TPROXY_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_TPROXY_FAMILY:
+ case NFTA_TPROXY_REG_ADDR:
+ case NFTA_TPROXY_REG_PORT:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int
+nftnl_expr_tproxy_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_TPROXY_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_tproxy_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_TPROXY_FAMILY]) {
+ tproxy->family = ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_FAMILY]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_FAMILY);
+ }
+ if (tb[NFTA_TPROXY_REG_ADDR]) {
+ tproxy->sreg_addr =
+ ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_ADDR]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_ADDR);
+ }
+ if (tb[NFTA_TPROXY_REG_PORT]) {
+ tproxy->sreg_port =
+ ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_PORT]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_PORT);
+ }
+
+ return 0;
+}
+
+static void
+nftnl_expr_tproxy_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_FAMILY, htonl(tproxy->family));
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_ADDR,
+ htonl(tproxy->sreg_addr));
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_PORT,
+ htonl(tproxy->sreg_port));
+}
+
+static int
+nftnl_expr_tproxy_snprintf_default(char *buf, size_t size,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+ int remain = size, offset = 0, ret = 0;
+
+ if (tproxy->family != NFTA_TPROXY_UNSPEC) {
+ ret = snprintf(buf + offset, remain, "%s ",
+ nftnl_family2str(tproxy->family));
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR)) {
+ ret = snprintf(buf + offset, remain,
+ "addr reg %u ", tproxy->sreg_addr);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT)) {
+ ret = snprintf(buf + offset, remain,
+ "port reg %u ", tproxy->sreg_port);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ return offset;
+}
+
+static int
+nftnl_expr_tproxy_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_tproxy_snprintf_default(buf, size, e);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_tproxy_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_tproxy *n1 = nftnl_expr_data(e1);
+ struct nftnl_expr_tproxy *n2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
+ eq &= (n1->sreg_addr == n2->sreg_addr);
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
+ eq &= (n1->sreg_port == n2->sreg_port);
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
+ eq &= (n1->family == n2->family);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_tproxy = {
+ .name = "tproxy",
+ .alloc_len = sizeof(struct nftnl_expr_tproxy),
+ .max_attr = NFTA_TPROXY_MAX,
+ .cmp = nftnl_expr_tproxy_cmp,
+ .set = nftnl_expr_tproxy_set,
+ .get = nftnl_expr_tproxy_get,
+ .parse = nftnl_expr_tproxy_parse,
+ .build = nftnl_expr_tproxy_build,
+ .snprintf = nftnl_expr_tproxy_snprintf,
+};
projects / thirdparty / libnftnl.git / commitdiff
