set: add support to add elements to sets

This patch includes iterators and several examples.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/examples/nft-set-elem-add.c b/examples/nft-set-elem-add.c
new file mode 100644
index 0000000..992b09c
--- /dev/null
+++ b/examples/nft-set-elem-add.c
@@ -0,0 +1,114 @@
+/*
+ * (C) 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 software has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftables/set.h>
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	struct nlmsghdr *nlh;
+	uint32_t portid, seq, family, data;
+	struct nft_set *s;
+	struct nft_set_elem *e;
+	int ret;
+
+	if (argc != 4) {
+		fprintf(stderr, "%s <family> <table> <set>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	s = nft_set_alloc();
+	if (s == NULL) {
+		perror("OOM");
+		exit(EXIT_FAILURE);
+	}
+
+	seq = time(NULL);
+	if (strcmp(argv[1], "ip") == 0)
+		family = AF_INET;
+	else if (strcmp(argv[1], "ip6") == 0)
+		family = AF_INET6;
+	else if (strcmp(argv[1], "bridge") == 0)
+		family = AF_BRIDGE;
+	else {
+		fprintf(stderr, "Unknown family: ip, ip6, bridge\n");
+		exit(EXIT_FAILURE);
+	}
+
+	nft_set_attr_set(s, NFT_SET_ATTR_TABLE, argv[2]);
+	nft_set_attr_set(s, NFT_SET_ATTR_NAME, argv[3]);
+
+	/* Add to dummy elements to set */
+	e = nft_set_elem_alloc();
+	if (e == NULL) {
+		perror("OOM");
+		exit(EXIT_FAILURE);
+	}
+
+	data = 0x1;
+	nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
+	nft_set_elem_add(s, e);
+
+	e = nft_set_elem_alloc();
+	if (e == NULL) {
+		perror("OOM");
+		exit(EXIT_FAILURE);
+	}
+	data = 0x2;
+	nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
+	nft_set_elem_add(s, e);
+
+	nlh = nft_set_nlmsg_build_hdr(buf, NFT_MSG_NEWSETELEM, family,
+				      NLM_F_CREATE|NLM_F_EXCL|NLM_F_ACK, seq);
+	nft_set_elems_nlmsg_build_payload(nlh, s);
+	nft_set_free(s);
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+	portid = mnl_socket_get_portid(nl);
+
+	if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}