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-rw-r--r--src/expr/objref.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/src/expr/objref.c b/src/expr/objref.c
new file mode 100644
index 0000000..01bea7b
--- /dev/null
+++ b/src/expr/objref.c
@@ -0,0 +1,215 @@
+/*
+ * (C) 2016 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 <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_objref {
+ struct {
+ uint32_t type;
+ const char *name;
+ } imm;
+};
+
+static int nftnl_expr_objref_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_OBJREF_IMM_TYPE:
+ objref->imm.type = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_OBJREF_IMM_NAME:
+ objref->imm.name = strdup(data);
+ if (!objref->imm.name)
+ return -1;
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_expr_objref_get(const struct nftnl_expr *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_OBJREF_IMM_TYPE:
+ *data_len = sizeof(objref->imm.type);
+ return &objref->imm.type;
+ case NFTNL_EXPR_OBJREF_IMM_NAME:
+ *data_len = strlen(objref->imm.name) + 1;
+ return objref->imm.name;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_objref_cb(const struct nlattr *attr, void *data)
+{
+ int type = mnl_attr_get_type(attr);
+ const struct nlattr **tb = data;
+
+ if (mnl_attr_type_valid(attr, NFTA_OBJREF_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_OBJREF_IMM_TYPE:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ case NFTA_OBJREF_IMM_NAME:
+ if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void nftnl_expr_objref_build(struct nlmsghdr *nlh,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_TYPE))
+ mnl_attr_put_u32(nlh, NFTA_OBJREF_IMM_TYPE,
+ htonl(objref->imm.type));
+ if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_NAME))
+ mnl_attr_put_str(nlh, NFTA_OBJREF_IMM_NAME, objref->imm.name);
+}
+
+static int nftnl_expr_objref_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_OBJREF_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_objref_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_OBJREF_IMM_TYPE]) {
+ objref->imm.type =
+ ntohl(mnl_attr_get_u32(tb[NFTA_OBJREF_IMM_TYPE]));
+ e->flags |= (1 << NFTNL_EXPR_OBJREF_IMM_TYPE);
+ }
+ if (tb[NFTA_OBJREF_IMM_NAME]) {
+ objref->imm.name =
+ strdup(mnl_attr_get_str(tb[NFTA_OBJREF_IMM_NAME]));
+ e->flags |= (1 << NFTNL_EXPR_OBJREF_IMM_NAME);
+ }
+
+ return 0;
+}
+
+static int
+nftnl_expr_objref_json_parse(struct nftnl_expr *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ uint32_t uval32;
+ const char *str;
+
+ if (nftnl_jansson_node_exist(root, "name")) {
+ str = nftnl_jansson_parse_str(root, "name", err);
+ if (str == NULL)
+ return -1;
+
+ nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, str);
+ }
+
+ if (nftnl_jansson_parse_val(root, "type", NFTNL_TYPE_U32, &uval32,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, uval32);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int nftnl_expr_objref_export(char *buf, size_t size,
+ const struct nftnl_expr *e, int type)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_TYPE))
+ nftnl_buf_u32(&b, type, objref->imm.type, BYTES);
+ if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_NAME))
+ nftnl_buf_str(&b, type, objref->imm.name, NAME);
+
+ return nftnl_buf_done(&b);
+}
+
+static int nftnl_expr_objref_snprintf_default(char *buf, size_t len,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_objref *objref = nftnl_expr_data(e);
+
+ return snprintf(buf, len, "type %u name %s ",
+ objref->imm.type, objref->imm.name);
+}
+
+static int nftnl_expr_objref_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags,
+ const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_objref_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_XML:
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_expr_objref_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_objref_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_objref *c1 = nftnl_expr_data(e1);
+ struct nftnl_expr_objref *c2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_OBJREF_IMM_TYPE))
+ eq &= (c1->imm.type == c2->imm.type);
+ if (e1->flags & (1 << NFTNL_EXPR_OBJREF_IMM_NAME))
+ eq &= !strcmp(c1->imm.name, c2->imm.name);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_objref = {
+ .name = "objref",
+ .alloc_len = sizeof(struct nftnl_expr_objref),
+ .max_attr = NFTA_OBJREF_MAX,
+ .cmp = nftnl_expr_objref_cmp,
+ .set = nftnl_expr_objref_set,
+ .get = nftnl_expr_objref_get,
+ .parse = nftnl_expr_objref_parse,
+ .build = nftnl_expr_objref_build,
+ .snprintf = nftnl_expr_objref_snprintf,
+ .json_parse = nftnl_expr_objref_json_parse,
+};