--- /dev/null
+/*
+ * (C) 2012-2022 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.
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <libmnl/libmnl.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_inner {
+ uint32_t type;
+ uint32_t flags;
+ uint32_t hdrsize;
+ struct nftnl_expr *expr;
+};
+
+static void nftnl_expr_inner_free(const struct nftnl_expr *e)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+
+ if (inner->expr)
+ nftnl_expr_free(inner->expr);
+}
+
+static int
+nftnl_expr_inner_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_INNER_TYPE:
+ memcpy(&inner->type, data, sizeof(inner->type));
+ break;
+ case NFTNL_EXPR_INNER_FLAGS:
+ memcpy(&inner->flags, data, sizeof(inner->flags));
+ break;
+ case NFTNL_EXPR_INNER_HDRSIZE:
+ memcpy(&inner->hdrsize, data, sizeof(inner->hdrsize));
+ break;
+ case NFTNL_EXPR_INNER_EXPR:
+ if (inner->expr)
+ nftnl_expr_free(inner->expr);
+
+ inner->expr = (void *)data;
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_inner_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_INNER_FLAGS:
+ *data_len = sizeof(inner->flags);
+ return &inner->flags;
+ case NFTNL_EXPR_INNER_TYPE:
+ *data_len = sizeof(inner->type);
+ return &inner->type;
+ case NFTNL_EXPR_INNER_HDRSIZE:
+ *data_len = sizeof(inner->hdrsize);
+ return &inner->hdrsize;
+ case NFTNL_EXPR_INNER_EXPR:
+ return inner->expr;
+ }
+ return NULL;
+}
+
+static void
+nftnl_expr_inner_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+ struct nlattr *nest;
+
+ mnl_attr_put_u32(nlh, NFTA_INNER_NUM, htonl(0));
+ if (e->flags & (1 << NFTNL_EXPR_INNER_TYPE))
+ mnl_attr_put_u32(nlh, NFTA_INNER_TYPE, htonl(inner->type));
+ if (e->flags & (1 << NFTNL_EXPR_INNER_FLAGS))
+ mnl_attr_put_u32(nlh, NFTA_INNER_FLAGS, htonl(inner->flags));
+ if (e->flags & (1 << NFTNL_EXPR_INNER_HDRSIZE))
+ mnl_attr_put_u32(nlh, NFTA_INNER_HDRSIZE, htonl(inner->hdrsize));
+ if (e->flags & (1 << NFTNL_EXPR_INNER_EXPR)) {
+ nest = mnl_attr_nest_start(nlh, NFTA_INNER_EXPR);
+ nftnl_expr_build_payload(nlh, inner->expr);
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int nftnl_inner_parse_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_INNER_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_INNER_NUM:
+ case NFTA_INNER_TYPE:
+ case NFTA_INNER_HDRSIZE:
+ case NFTA_INNER_FLAGS:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ case NFTA_INNER_EXPR:
+ if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+
+ return MNL_CB_OK;
+}
+
+static int
+nftnl_expr_inner_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_INNER_MAX + 1] = {};
+ struct nftnl_expr *expr;
+ int err;
+
+ err = mnl_attr_parse_nested(attr, nftnl_inner_parse_cb, tb);
+ if (err < 0)
+ return err;
+
+ if (tb[NFTA_INNER_HDRSIZE]) {
+ inner->hdrsize =
+ ntohl(mnl_attr_get_u32(tb[NFTA_INNER_HDRSIZE]));
+ e->flags |= (1 << NFTNL_EXPR_INNER_HDRSIZE);
+ }
+ if (tb[NFTA_INNER_FLAGS]) {
+ inner->flags =
+ ntohl(mnl_attr_get_u32(tb[NFTA_INNER_FLAGS]));
+ e->flags |= (1 << NFTNL_EXPR_INNER_FLAGS);
+ }
+ if (tb[NFTA_INNER_TYPE]) {
+ inner->type =
+ ntohl(mnl_attr_get_u32(tb[NFTA_INNER_TYPE]));
+ e->flags |= (1 << NFTNL_EXPR_INNER_TYPE);
+ }
+ if (tb[NFTA_INNER_EXPR]) {
+ expr = nftnl_expr_parse(tb[NFTA_INNER_EXPR]);
+ if (!expr)
+ return -1;
+
+ if (inner->expr)
+ nftnl_expr_free(inner->expr);
+
+ inner->expr = expr;
+ e->flags |= (1 << NFTNL_EXPR_INNER_EXPR);
+ }
+
+ return 0;
+}
+
+static int
+nftnl_expr_inner_snprintf(char *buf, size_t remain, uint32_t flags,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_inner *inner = nftnl_expr_data(e);
+ uint32_t offset = 0;
+ int ret;
+
+ ret = snprintf(buf, remain, "type %u hdrsize %u flags %x [",
+ inner->type, inner->hdrsize, inner->flags);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ ret = snprintf(buf + offset, remain, " %s ", inner->expr->ops->name);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ ret = nftnl_expr_snprintf(buf + offset, remain, inner->expr,
+ NFTNL_OUTPUT_DEFAULT, 0);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ ret = snprintf(buf + offset, remain, "] ");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ return offset;
+}
+
+struct expr_ops expr_ops_inner = {
+ .name = "inner",
+ .alloc_len = sizeof(struct nftnl_expr_inner),
+ .max_attr = NFTA_INNER_MAX,
+ .free = nftnl_expr_inner_free,
+ .set = nftnl_expr_inner_set,
+ .get = nftnl_expr_inner_get,
+ .parse = nftnl_expr_inner_parse,
+ .build = nftnl_expr_inner_build,
+ .output = nftnl_expr_inner_snprintf,
+};
projects / thirdparty / libnftnl.git / commitdiff
