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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:04:34 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:04:34 +0000
commit371c8a8bca2b6862226bc79c13d143e07c1d8fc3 (patch)
tree06c7dc8826596690422e79d5bde2f46c90492de3 /src/expr/connlimit.c
parentInitial commit. (diff)
downloadlibnftnl-371c8a8bca2b6862226bc79c13d143e07c1d8fc3.tar.xz
libnftnl-371c8a8bca2b6862226bc79c13d143e07c1d8fc3.zip
Adding upstream version 1.2.6.upstream/1.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/expr/connlimit.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/src/expr/connlimit.c b/src/expr/connlimit.c
new file mode 100644
index 0000000..549417b
--- /dev/null
+++ b/src/expr/connlimit.c
@@ -0,0 +1,139 @@
+/*
+ * (C) 2018 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_connlimit {
+ uint32_t count;
+ uint32_t flags;
+};
+
+static int
+nftnl_expr_connlimit_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_CONNLIMIT_COUNT:
+ memcpy(&connlimit->count, data, sizeof(connlimit->count));
+ break;
+ case NFTNL_EXPR_CONNLIMIT_FLAGS:
+ memcpy(&connlimit->flags, data, sizeof(connlimit->flags));
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_connlimit_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_CONNLIMIT_COUNT:
+ *data_len = sizeof(connlimit->count);
+ return &connlimit->count;
+ case NFTNL_EXPR_CONNLIMIT_FLAGS:
+ *data_len = sizeof(connlimit->flags);
+ return &connlimit->flags;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_connlimit_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_CONNLIMIT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_CONNLIMIT_COUNT:
+ case NFTA_CONNLIMIT_FLAGS:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_connlimit_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_COUNT))
+ mnl_attr_put_u32(nlh, NFTA_CONNLIMIT_COUNT,
+ htonl(connlimit->count));
+ if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_FLAGS))
+ mnl_attr_put_u32(nlh, NFTA_CONNLIMIT_FLAGS,
+ htonl(connlimit->flags));
+}
+
+static int
+nftnl_expr_connlimit_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_CONNLIMIT_MAX+1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_connlimit_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_CONNLIMIT_COUNT]) {
+ connlimit->count =
+ ntohl(mnl_attr_get_u32(tb[NFTA_CONNLIMIT_COUNT]));
+ e->flags |= (1 << NFTNL_EXPR_CONNLIMIT_COUNT);
+ }
+ if (tb[NFTA_CONNLIMIT_FLAGS]) {
+ connlimit->flags =
+ ntohl(mnl_attr_get_u32(tb[NFTA_CONNLIMIT_FLAGS]));
+ e->flags |= (1 << NFTNL_EXPR_CONNLIMIT_FLAGS);
+ }
+
+ return 0;
+}
+
+static int nftnl_expr_connlimit_snprintf(char *buf, size_t len,
+ uint32_t flags,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e);
+
+ return snprintf(buf, len, "count %u flags %x ",
+ connlimit->count, connlimit->flags);
+}
+
+struct expr_ops expr_ops_connlimit = {
+ .name = "connlimit",
+ .alloc_len = sizeof(struct nftnl_expr_connlimit),
+ .max_attr = NFTA_CONNLIMIT_MAX,
+ .set = nftnl_expr_connlimit_set,
+ .get = nftnl_expr_connlimit_get,
+ .parse = nftnl_expr_connlimit_parse,
+ .build = nftnl_expr_connlimit_build,
+ .output = nftnl_expr_connlimit_snprintf,
+};