Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 918 insertions, 0 deletions

diff --git a/src/set_elem.c b/src/set_elem.c
new file mode 100644
index 0000000..884faff
--- /dev/null
+++ b/src/set_elem.c
@@ -0,0 +1,918 @@
+/*
+ * (C) 2012-2013 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 code has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+#include "internal.h"
+
+#include <time.h>
+#include <endian.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libnftnl/set.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+EXPORT_SYMBOL(nftnl_set_elem_alloc);
+struct nftnl_set_elem *nftnl_set_elem_alloc(void)
+{
+	struct nftnl_set_elem *s;
+
+	s = calloc(1, sizeof(struct nftnl_set_elem));
+	if (s == NULL)
+		return NULL;
+
+	INIT_LIST_HEAD(&s->expr_list);
+
+	return s;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_free);
+void nftnl_set_elem_free(struct nftnl_set_elem *s)
+{
+	struct nftnl_expr *e, *tmp;
+
+	if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
+		xfree(s->data.chain);
+
+	list_for_each_entry_safe(e, tmp, &s->expr_list, head)
+		nftnl_expr_free(e);
+
+	if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
+		xfree(s->user.data);
+
+	if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
+		xfree(s->objref);
+
+	xfree(s);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_is_set);
+bool nftnl_set_elem_is_set(const struct nftnl_set_elem *s, uint16_t attr)
+{
+	return s->flags & (1 << attr);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_unset);
+void nftnl_set_elem_unset(struct nftnl_set_elem *s, uint16_t attr)
+{
+	struct nftnl_expr *expr, *tmp;
+
+	if (!(s->flags & (1 << attr)))
+		return;
+
+	switch (attr) {
+	case NFTNL_SET_ELEM_CHAIN:
+		xfree(s->data.chain);
+		break;
+	case NFTNL_SET_ELEM_FLAGS:
+	case NFTNL_SET_ELEM_KEY:	/* NFTA_SET_ELEM_KEY */
+	case NFTNL_SET_ELEM_KEY_END:	/* NFTA_SET_ELEM_KEY_END */
+	case NFTNL_SET_ELEM_VERDICT:	/* NFTA_SET_ELEM_DATA */
+	case NFTNL_SET_ELEM_DATA:	/* NFTA_SET_ELEM_DATA */
+	case NFTNL_SET_ELEM_TIMEOUT:	/* NFTA_SET_ELEM_TIMEOUT */
+	case NFTNL_SET_ELEM_EXPIRATION:	/* NFTA_SET_ELEM_EXPIRATION */
+		break;
+	case NFTNL_SET_ELEM_USERDATA:	/* NFTA_SET_ELEM_USERDATA */
+		xfree(s->user.data);
+		break;
+	case NFTNL_SET_ELEM_EXPR:
+	case NFTNL_SET_ELEM_EXPRESSIONS:
+		list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
+			nftnl_expr_free(expr);
+		break;
+	case NFTNL_SET_ELEM_OBJREF:
+		xfree(s->objref);
+		break;
+	default:
+		return;
+	}
+
+	s->flags &= ~(1 << attr);
+}
+
+static uint32_t nftnl_set_elem_validate[NFTNL_SET_ELEM_MAX + 1] = {
+	[NFTNL_SET_ELEM_FLAGS]		= sizeof(uint32_t),
+	[NFTNL_SET_ELEM_VERDICT]	= sizeof(uint32_t),
+	[NFTNL_SET_ELEM_TIMEOUT]	= sizeof(uint64_t),
+	[NFTNL_SET_ELEM_EXPIRATION]	= sizeof(uint64_t),
+};
+
+EXPORT_SYMBOL(nftnl_set_elem_set);
+int nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr,
+		       const void *data, uint32_t data_len)
+{
+	struct nftnl_expr *expr, *tmp;
+
+	nftnl_assert_attr_exists(attr, NFTNL_SET_ELEM_MAX);
+	nftnl_assert_validate(data, nftnl_set_elem_validate, attr, data_len);
+
+	switch(attr) {
+	case NFTNL_SET_ELEM_FLAGS:
+		memcpy(&s->set_elem_flags, data, sizeof(s->set_elem_flags));
+		break;
+	case NFTNL_SET_ELEM_KEY:	/* NFTA_SET_ELEM_KEY */
+		memcpy(&s->key.val, data, data_len);
+		s->key.len = data_len;
+		break;
+	case NFTNL_SET_ELEM_KEY_END:	/* NFTA_SET_ELEM_KEY_END */
+		memcpy(&s->key_end.val, data, data_len);
+		s->key_end.len = data_len;
+		break;
+	case NFTNL_SET_ELEM_VERDICT:	/* NFTA_SET_ELEM_DATA */
+		memcpy(&s->data.verdict, data, sizeof(s->data.verdict));
+		break;
+	case NFTNL_SET_ELEM_CHAIN:	/* NFTA_SET_ELEM_DATA */
+		if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
+			xfree(s->data.chain);
+
+		s->data.chain = strdup(data);
+		if (!s->data.chain)
+			return -1;
+		break;
+	case NFTNL_SET_ELEM_DATA:	/* NFTA_SET_ELEM_DATA */
+		memcpy(s->data.val, data, data_len);
+		s->data.len = data_len;
+		break;
+	case NFTNL_SET_ELEM_TIMEOUT:	/* NFTA_SET_ELEM_TIMEOUT */
+		memcpy(&s->timeout, data, sizeof(s->timeout));
+		break;
+	case NFTNL_SET_ELEM_EXPIRATION:	/* NFTA_SET_ELEM_EXPIRATION */
+		memcpy(&s->expiration, data, sizeof(s->expiration));
+		break;
+	case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
+		if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
+			xfree(s->user.data);
+
+		s->user.data = malloc(data_len);
+		if (!s->user.data)
+			return -1;
+		memcpy(s->user.data, data, data_len);
+		s->user.len = data_len;
+		break;
+	case NFTNL_SET_ELEM_OBJREF:
+		if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
+			xfree(s->objref);
+
+		s->objref = strdup(data);
+		if (!s->objref)
+			return -1;
+		break;
+	case NFTNL_SET_ELEM_EXPR:
+		list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
+			nftnl_expr_free(expr);
+
+		expr = (void *)data;
+		list_add(&expr->head, &s->expr_list);
+		break;
+	}
+	s->flags |= (1 << attr);
+	return 0;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_set_u32);
+void nftnl_set_elem_set_u32(struct nftnl_set_elem *s, uint16_t attr, uint32_t val)
+{
+	nftnl_set_elem_set(s, attr, &val, sizeof(uint32_t));
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_set_u64);
+void nftnl_set_elem_set_u64(struct nftnl_set_elem *s, uint16_t attr, uint64_t val)
+{
+	nftnl_set_elem_set(s, attr, &val, sizeof(uint64_t));
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_set_str);
+int nftnl_set_elem_set_str(struct nftnl_set_elem *s, uint16_t attr, const char *str)
+{
+	return nftnl_set_elem_set(s, attr, str, strlen(str) + 1);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_get);
+const void *nftnl_set_elem_get(struct nftnl_set_elem *s, uint16_t attr, uint32_t *data_len)
+{
+	struct nftnl_expr *expr;
+
+	if (!(s->flags & (1 << attr)))
+		return NULL;
+
+	switch(attr) {
+	case NFTNL_SET_ELEM_FLAGS:
+		*data_len = sizeof(s->set_elem_flags);
+		return &s->set_elem_flags;
+	case NFTNL_SET_ELEM_KEY:	/* NFTA_SET_ELEM_KEY */
+		*data_len = s->key.len;
+		return &s->key.val;
+	case NFTNL_SET_ELEM_KEY_END:	/* NFTA_SET_ELEM_KEY_END */
+		*data_len = s->key_end.len;
+		return &s->key_end.val;
+	case NFTNL_SET_ELEM_VERDICT:	/* NFTA_SET_ELEM_DATA */
+		*data_len = sizeof(s->data.verdict);
+		return &s->data.verdict;
+	case NFTNL_SET_ELEM_CHAIN:	/* NFTA_SET_ELEM_DATA */
+		*data_len = strlen(s->data.chain) + 1;
+		return s->data.chain;
+	case NFTNL_SET_ELEM_DATA:	/* NFTA_SET_ELEM_DATA */
+		*data_len = s->data.len;
+		return &s->data.val;
+	case NFTNL_SET_ELEM_TIMEOUT:	/* NFTA_SET_ELEM_TIMEOUT */
+		*data_len = sizeof(s->timeout);
+		return &s->timeout;
+	case NFTNL_SET_ELEM_EXPIRATION:	/* NFTA_SET_ELEM_EXPIRATION */
+		*data_len = sizeof(s->expiration);
+		return &s->expiration;
+	case NFTNL_SET_ELEM_USERDATA:
+		*data_len = s->user.len;
+		return s->user.data;
+	case NFTNL_SET_ELEM_EXPR:
+		list_for_each_entry(expr, &s->expr_list, head)
+			break;
+		return expr;
+	case NFTNL_SET_ELEM_OBJREF:
+		*data_len = strlen(s->objref) + 1;
+		return s->objref;
+	}
+	return NULL;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_get_str);
+const char *nftnl_set_elem_get_str(struct nftnl_set_elem *s, uint16_t attr)
+{
+	uint32_t size;
+
+	return nftnl_set_elem_get(s, attr, &size);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_get_u32);
+uint32_t nftnl_set_elem_get_u32(struct nftnl_set_elem *s, uint16_t attr)
+{
+	uint32_t size, val;
+
+	memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
+
+	return val;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_get_u64);
+uint64_t nftnl_set_elem_get_u64(struct nftnl_set_elem *s, uint16_t attr)
+{
+	uint32_t size;
+	uint64_t val;
+
+	memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
+
+	return val;
+}
+
+struct nftnl_set_elem *nftnl_set_elem_clone(struct nftnl_set_elem *elem)
+{
+	struct nftnl_set_elem *newelem;
+
+	newelem = nftnl_set_elem_alloc();
+	if (newelem == NULL)
+		return NULL;
+
+	memcpy(newelem, elem, sizeof(*elem));
+
+	if (elem->flags & (1 << NFTNL_SET_ELEM_CHAIN)) {
+		newelem->data.chain = strdup(elem->data.chain);
+		if (!newelem->data.chain)
+			goto err;
+	}
+
+	return newelem;
+err:
+	nftnl_set_elem_free(newelem);
+	return NULL;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build_payload);
+void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
+				      struct nftnl_set_elem *e)
+{
+	struct nftnl_expr *expr;
+	int num_exprs = 0;
+
+	if (e->flags & (1 << NFTNL_SET_ELEM_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_SET_ELEM_FLAGS, htonl(e->set_elem_flags));
+	if (e->flags & (1 << NFTNL_SET_ELEM_TIMEOUT))
+		mnl_attr_put_u64(nlh, NFTA_SET_ELEM_TIMEOUT, htobe64(e->timeout));
+	if (e->flags & (1 << NFTNL_SET_ELEM_EXPIRATION))
+		mnl_attr_put_u64(nlh, NFTA_SET_ELEM_EXPIRATION, htobe64(e->expiration));
+	if (e->flags & (1 << NFTNL_SET_ELEM_KEY)) {
+		struct nlattr *nest1;
+
+		nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY);
+		mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key.len, e->key.val);
+		mnl_attr_nest_end(nlh, nest1);
+	}
+	if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
+		struct nlattr *nest1;
+
+		nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY_END);
+		mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key_end.len,
+			     e->key_end.val);
+		mnl_attr_nest_end(nlh, nest1);
+	}
+	if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT)) {
+		struct nlattr *nest1, *nest2;
+
+		nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
+		nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
+		mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(e->data.verdict));
+		if (e->flags & (1 << NFTNL_SET_ELEM_CHAIN))
+			mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, e->data.chain);
+
+		mnl_attr_nest_end(nlh, nest1);
+		mnl_attr_nest_end(nlh, nest2);
+	}
+	if (e->flags & (1 << NFTNL_SET_ELEM_DATA)) {
+		struct nlattr *nest1;
+
+		nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
+		mnl_attr_put(nlh, NFTA_DATA_VALUE, e->data.len, e->data.val);
+		mnl_attr_nest_end(nlh, nest1);
+	}
+	if (e->flags & (1 << NFTNL_SET_ELEM_USERDATA))
+		mnl_attr_put(nlh, NFTA_SET_ELEM_USERDATA, e->user.len, e->user.data);
+	if (e->flags & (1 << NFTNL_SET_ELEM_OBJREF))
+		mnl_attr_put_strz(nlh, NFTA_SET_ELEM_OBJREF, e->objref);
+
+	if (!list_empty(&e->expr_list)) {
+		list_for_each_entry(expr, &e->expr_list, head)
+			num_exprs++;
+
+		if (num_exprs == 1) {
+			struct nlattr *nest1;
+
+			nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPR);
+			list_for_each_entry(expr, &e->expr_list, head)
+				nftnl_expr_build_payload(nlh, expr);
+
+			mnl_attr_nest_end(nlh, nest1);
+		} else if (num_exprs > 1) {
+			struct nlattr *nest1, *nest2;
+
+			nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPRESSIONS);
+			list_for_each_entry(expr, &e->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);
+		}
+	}
+}
+
+static void nftnl_set_elem_nlmsg_build_def(struct nlmsghdr *nlh,
+					   const struct nftnl_set *s)
+{
+	if (s->flags & (1 << NFTNL_SET_NAME))
+		mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_SET, s->name);
+	if (s->flags & (1 << NFTNL_SET_ID))
+		mnl_attr_put_u32(nlh, NFTA_SET_ELEM_LIST_SET_ID, htonl(s->id));
+	if (s->flags & (1 << NFTNL_SET_TABLE))
+		mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_TABLE, s->table);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build);
+struct nlattr *nftnl_set_elem_nlmsg_build(struct nlmsghdr *nlh,
+					  struct nftnl_set_elem *elem, int i)
+{
+	struct nlattr *nest2;
+
+	nest2 = mnl_attr_nest_start(nlh, i);
+	nftnl_set_elem_nlmsg_build_payload(nlh, elem);
+	mnl_attr_nest_end(nlh, nest2);
+
+	return nest2;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload);
+void nftnl_set_elems_nlmsg_build_payload(struct nlmsghdr *nlh, struct nftnl_set *s)
+{
+	struct nftnl_set_elem *elem;
+	struct nlattr *nest1;
+	int i = 0;
+
+	nftnl_set_elem_nlmsg_build_def(nlh, s);
+
+	if (list_empty(&s->element_list))
+		return;
+
+	nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
+	list_for_each_entry(elem, &s->element_list, head)
+		nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
+
+	mnl_attr_nest_end(nlh, nest1);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_add_expr);
+void nftnl_set_elem_add_expr(struct nftnl_set_elem *e, struct nftnl_expr *expr)
+{
+	list_add_tail(&expr->head, &e->expr_list);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_expr_foreach);
+int nftnl_set_elem_expr_foreach(struct nftnl_set_elem *e,
+				int (*cb)(struct nftnl_expr *e, void *data),
+				void *data)
+{
+       struct nftnl_expr *cur, *tmp;
+       int ret;
+
+	list_for_each_entry_safe(cur, tmp, &e->expr_list, head) {
+		ret = cb(cur, data);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+static int nftnl_set_elem_parse_attr_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_SET_ELEM_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SET_ELEM_TIMEOUT:
+	case NFTA_SET_ELEM_EXPIRATION:
+		if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SET_ELEM_KEY:
+	case NFTA_SET_ELEM_KEY_END:
+	case NFTA_SET_ELEM_DATA:
+	case NFTA_SET_ELEM_EXPR:
+	case NFTA_SET_ELEM_EXPRESSIONS:
+		if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SET_ELEM_USERDATA:
+		if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int nftnl_set_elems_parse2(struct nftnl_set *s, const struct nlattr *nest)
+{
+	struct nlattr *tb[NFTA_SET_ELEM_MAX+1] = {};
+	struct nftnl_set_elem *e;
+	int ret, type;
+
+	e = nftnl_set_elem_alloc();
+	if (e == NULL)
+		return -1;
+
+	ret = mnl_attr_parse_nested(nest, nftnl_set_elem_parse_attr_cb, tb);
+	if (ret < 0)
+		goto out_set_elem;
+
+	if (tb[NFTA_SET_ELEM_FLAGS]) {
+		e->set_elem_flags =
+			ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_FLAGS]));
+		e->flags |= (1 << NFTNL_SET_ELEM_FLAGS);
+	}
+	if (tb[NFTA_SET_ELEM_TIMEOUT]) {
+		e->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_TIMEOUT]));
+		e->flags |= (1 << NFTNL_SET_ELEM_TIMEOUT);
+	}
+	if (tb[NFTA_SET_ELEM_EXPIRATION]) {
+		e->expiration = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_EXPIRATION]));
+		e->flags |= (1 << NFTNL_SET_ELEM_EXPIRATION);
+	}
+        if (tb[NFTA_SET_ELEM_KEY]) {
+		ret = nftnl_parse_data(&e->key, tb[NFTA_SET_ELEM_KEY], &type);
+		if (ret < 0)
+			goto out_set_elem;
+		e->flags |= (1 << NFTNL_SET_ELEM_KEY);
+        }
+	if (tb[NFTA_SET_ELEM_KEY_END]) {
+		ret = nftnl_parse_data(&e->key_end, tb[NFTA_SET_ELEM_KEY_END],
+				       &type);
+		if (ret < 0)
+			goto out_set_elem;
+		e->flags |= (1 << NFTNL_SET_ELEM_KEY_END);
+	}
+        if (tb[NFTA_SET_ELEM_DATA]) {
+		ret = nftnl_parse_data(&e->data, tb[NFTA_SET_ELEM_DATA], &type);
+		if (ret < 0)
+			goto out_set_elem;
+		switch(type) {
+		case DATA_VERDICT:
+			e->flags |= (1 << NFTNL_SET_ELEM_VERDICT);
+			break;
+		case DATA_CHAIN:
+			e->flags |= (1 << NFTNL_SET_ELEM_VERDICT) |
+				    (1 << NFTNL_SET_ELEM_CHAIN);
+			break;
+		case DATA_VALUE:
+			e->flags |= (1 << NFTNL_SET_ELEM_DATA);
+			break;
+		}
+        }
+	if (tb[NFTA_SET_ELEM_EXPR]) {
+		struct nftnl_expr *expr;
+
+		expr = nftnl_expr_parse(tb[NFTA_SET_ELEM_EXPR]);
+		if (expr == NULL) {
+			ret = -1;
+			goto out_set_elem;
+		}
+		list_add_tail(&expr->head, &e->expr_list);
+		e->flags |= (1 << NFTNL_SET_ELEM_EXPR);
+	} else if (tb[NFTA_SET_ELEM_EXPRESSIONS]) {
+		struct nftnl_expr *expr;
+		struct nlattr *attr;
+
+		mnl_attr_for_each_nested(attr, tb[NFTA_SET_ELEM_EXPRESSIONS]) {
+			if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM) {
+				ret = -1;
+				goto out_set_elem;
+			}
+			expr = nftnl_expr_parse(attr);
+			if (expr == NULL) {
+				ret = -1;
+				goto out_set_elem;
+			}
+			list_add_tail(&expr->head, &e->expr_list);
+		}
+		e->flags |= (1 << NFTNL_SET_ELEM_EXPRESSIONS);
+	}
+	if (tb[NFTA_SET_ELEM_USERDATA]) {
+		const void *udata =
+			mnl_attr_get_payload(tb[NFTA_SET_ELEM_USERDATA]);
+
+		if (e->flags & (1 << NFTNL_RULE_USERDATA))
+			xfree(e->user.data);
+
+		e->user.len  = mnl_attr_get_payload_len(tb[NFTA_SET_ELEM_USERDATA]);
+		e->user.data = malloc(e->user.len);
+		if (e->user.data == NULL) {
+			ret = -1;
+			goto out_set_elem;
+		}
+		memcpy(e->user.data, udata, e->user.len);
+		e->flags |= (1 << NFTNL_RULE_USERDATA);
+	}
+	if (tb[NFTA_SET_ELEM_OBJREF]) {
+		e->objref = strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_OBJREF]));
+		if (e->objref == NULL) {
+			ret = -1;
+			goto out_set_elem;
+		}
+		e->flags |= (1 << NFTNL_SET_ELEM_OBJREF);
+	}
+
+	/* Add this new element to this set */
+	list_add_tail(&e->head, &s->element_list);
+
+	return 0;
+out_set_elem:
+	nftnl_set_elem_free(e);
+	return ret;
+}
+
+static int
+nftnl_set_elem_list_parse_attr_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_ELEM_LIST_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_SET_ELEM_LIST_TABLE:
+	case NFTA_SET_ELEM_LIST_SET:
+		if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SET_ELEM_LIST_ELEMENTS:
+		if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int nftnl_set_elems_parse(struct nftnl_set *s, const struct nlattr *nest)
+{
+	struct nlattr *attr;
+	int ret = 0;
+
+	mnl_attr_for_each_nested(attr, nest) {
+		if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM)
+			return -1;
+
+		ret = nftnl_set_elems_parse2(s, attr);
+		if (ret < 0)
+			return ret;
+	}
+	return ret;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_nlmsg_parse);
+int nftnl_set_elems_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_set *s)
+{
+	struct nlattr *tb[NFTA_SET_ELEM_LIST_MAX+1] = {};
+	struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
+	int ret;
+
+	if (mnl_attr_parse(nlh, sizeof(*nfg),
+			   nftnl_set_elem_list_parse_attr_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_SET_ELEM_LIST_TABLE]) {
+		if (s->flags & (1 << NFTNL_SET_TABLE))
+			xfree(s->table);
+		s->table =
+			strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_TABLE]));
+		if (!s->table)
+			return -1;
+		s->flags |= (1 << NFTNL_SET_TABLE);
+	}
+	if (tb[NFTA_SET_ELEM_LIST_SET]) {
+		if (s->flags & (1 << NFTNL_SET_NAME))
+			xfree(s->name);
+		s->name =
+			strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_SET]));
+		if (!s->name)
+			return -1;
+		s->flags |= (1 << NFTNL_SET_NAME);
+	}
+	if (tb[NFTA_SET_ELEM_LIST_SET_ID]) {
+		s->id = ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_LIST_SET_ID]));
+		s->flags |= (1 << NFTNL_SET_ID);
+	}
+        if (tb[NFTA_SET_ELEM_LIST_ELEMENTS]) {
+	 	ret = nftnl_set_elems_parse(s, tb[NFTA_SET_ELEM_LIST_ELEMENTS]);
+		if (ret < 0)
+			return ret;
+	}
+
+	s->family = nfg->nfgen_family;
+	s->flags |= (1 << NFTNL_SET_FAMILY);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_parse);
+int nftnl_set_elem_parse(struct nftnl_set_elem *e, enum nftnl_parse_type type,
+		       const char *data, struct nftnl_parse_err *err)
+{
+	errno = EOPNOTSUPP;
+	return -1;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_parse_file);
+int nftnl_set_elem_parse_file(struct nftnl_set_elem *e, enum nftnl_parse_type type,
+			    FILE *fp, struct nftnl_parse_err *err)
+{
+	errno = EOPNOTSUPP;
+	return -1;
+}
+
+int nftnl_set_elem_snprintf_default(char *buf, size_t remain,
+				    const struct nftnl_set_elem *e)
+{
+	int ret, dregtype = DATA_VALUE, offset = 0, i;
+
+	ret = snprintf(buf, remain, "element ");
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key,
+				      DATA_F_NOPFX, DATA_VALUE);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
+		ret = snprintf(buf + offset, remain, " - ");
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+		ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key_end,
+					      DATA_F_NOPFX, DATA_VALUE);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	ret = snprintf(buf + offset, remain, " : ");
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT))
+		dregtype = DATA_VERDICT;
+
+	ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->data,
+				      DATA_F_NOPFX, dregtype);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	ret = snprintf(buf + offset, remain, "%u [end]", e->set_elem_flags);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	if (e->user.len) {
+		ret = snprintf(buf + offset, remain, "  userdata = { ");
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+		for (i = 0; i < e->user.len; i++) {
+			char *c = e->user.data;
+
+			ret = snprintf(buf + offset, remain,
+				       isprint(c[i]) ? "%c" : "\\x%02hhx",
+				       c[i]);
+			SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+		}
+
+		ret = snprintf(buf + offset, remain, " }");
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	return offset;
+}
+
+static int nftnl_set_elem_cmd_snprintf(char *buf, size_t remain,
+				       const struct nftnl_set_elem *e,
+				       uint32_t cmd, uint32_t type,
+				       uint32_t flags)
+{
+	int ret, offset = 0;
+
+	if (type != NFTNL_OUTPUT_DEFAULT)
+		return -1;
+
+	ret = nftnl_set_elem_snprintf_default(buf + offset, remain, e);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	return offset;
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_snprintf);
+int nftnl_set_elem_snprintf(char *buf, size_t size,
+			    const struct nftnl_set_elem *e,
+			    uint32_t type, uint32_t flags)
+{
+	if (size)
+		buf[0] = '\0';
+
+	return nftnl_set_elem_cmd_snprintf(buf, size, e, nftnl_flag2cmd(flags),
+					 type, flags);
+}
+
+static int nftnl_set_elem_do_snprintf(char *buf, size_t size, const void *e,
+				      uint32_t cmd, uint32_t type,
+				      uint32_t flags)
+{
+	return nftnl_set_elem_snprintf(buf, size, e, type, flags);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_fprintf);
+int nftnl_set_elem_fprintf(FILE *fp, const struct nftnl_set_elem *se, uint32_t type,
+			 uint32_t flags)
+{
+	return nftnl_fprintf(fp, se, NFTNL_CMD_UNSPEC, type, flags,
+			   nftnl_set_elem_do_snprintf);
+}
+
+EXPORT_SYMBOL(nftnl_set_elem_foreach);
+int nftnl_set_elem_foreach(struct nftnl_set *s,
+			 int (*cb)(struct nftnl_set_elem *e, void *data),
+			 void *data)
+{
+	struct nftnl_set_elem *elem;
+	int ret;
+
+	list_for_each_entry(elem, &s->element_list, head) {
+		ret = cb(elem, data);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+struct nftnl_set_elems_iter {
+	const struct nftnl_set		*set;
+	const struct list_head		*list;
+	struct nftnl_set_elem		*cur;
+};
+
+EXPORT_SYMBOL(nftnl_set_elems_iter_create);
+struct nftnl_set_elems_iter *
+nftnl_set_elems_iter_create(const struct nftnl_set *s)
+{
+	struct nftnl_set_elems_iter *iter;
+
+	iter = calloc(1, sizeof(struct nftnl_set_elems_iter));
+	if (iter == NULL)
+		return NULL;
+
+	iter->set = s;
+	iter->list = &s->element_list;
+	if (list_empty(&s->element_list))
+		iter->cur = NULL;
+	else
+		iter->cur = list_entry(s->element_list.next,
+				       struct nftnl_set_elem, head);
+
+	return iter;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_iter_cur);
+struct nftnl_set_elem *
+nftnl_set_elems_iter_cur(const struct nftnl_set_elems_iter *iter)
+{
+	return iter->cur;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_iter_next);
+struct nftnl_set_elem *nftnl_set_elems_iter_next(struct nftnl_set_elems_iter *iter)
+{
+	struct nftnl_set_elem *s = iter->cur;
+
+	if (s == NULL)
+		return NULL;
+
+	iter->cur = list_entry(iter->cur->head.next, struct nftnl_set_elem, head);
+	if (&iter->cur->head == iter->list->next)
+		return NULL;
+
+	return s;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_iter_destroy);
+void nftnl_set_elems_iter_destroy(struct nftnl_set_elems_iter *iter)
+{
+	xfree(iter);
+}
+
+static bool nftnl_attr_nest_overflow(struct nlmsghdr *nlh,
+				   const struct nlattr *from,
+				   const struct nlattr *to)
+{
+	int len = (void *)to + to->nla_len - (void *)from;
+
+	/* The attribute length field is 16 bits long, thus the maximum payload
+	 * that an attribute can convey is UINT16_MAX. In case of overflow,
+	 * discard the last that did not fit into the attribute.
+	 */
+	if (len > UINT16_MAX) {
+		nlh->nlmsg_len -= to->nla_len;
+		return true;
+	}
+	return false;
+}
+
+EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload_iter);
+int nftnl_set_elems_nlmsg_build_payload_iter(struct nlmsghdr *nlh,
+					   struct nftnl_set_elems_iter *iter)
+{
+	struct nftnl_set_elem *elem;
+	struct nlattr *nest1, *nest2;
+	int i = 0, ret = 0;
+
+	nftnl_set_elem_nlmsg_build_def(nlh, iter->set);
+
+	/* This set is empty, don't add an empty list element nest. */
+	if (list_empty(&iter->set->element_list))
+		return ret;
+
+	nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
+	elem = nftnl_set_elems_iter_next(iter);
+	while (elem != NULL) {
+		nest2 = nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
+		if (nftnl_attr_nest_overflow(nlh, nest1, nest2)) {
+			/* Go back to previous not to miss this element */
+			iter->cur = list_entry(iter->cur->head.prev,
+					       struct nftnl_set_elem, head);
+			ret = 1;
+			break;
+		}
+		elem = nftnl_set_elems_iter_next(iter);
+	}
+	mnl_attr_nest_end(nlh, nest1);
+
+	return ret;
+}