examples: add nft-map-add

Place an example to add a map in the libnftnl tree.

Reported-by: Khawar Shehzad <shehzad.khawar@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/examples/Makefile.am b/examples/Makefile.am
index e002d36b42a334cc602df490677502200bfacc4f..9dca3a15c2c43f361ab9016f00a289329ada0d34 100644 (file)
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -18,6 +18,7 @@ check_PROGRAMS = nft-table-add                \
                 nft-set-parse-add      \
                 nft-set-get            \
                 nft-set-del            \
+                nft-map-add            \
                 nft-set-elem-add       \
                 nft-set-elem-get       \
                 nft-set-elem-del       \
@@ -79,6 +80,9 @@ nft_set_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 nft_set_get_SOURCES = nft-set-get.c
 nft_set_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 
+nft_map_add_SOURCES = nft-map-add.c
+nft_map_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
 nft_set_elem_add_SOURCES = nft-set-elem-add.c
 nft_set_elem_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
 

diff --git a/examples/nft-map-add.c b/examples/nft-map-add.c
new file mode 100644 (file)
index 0000000..53244f5
--- /dev/null
+++ b/examples/nft-map-add.c
@@ -0,0 +1,157 @@
+/*
+ * (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 <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stddef.h>    /* for offsetof */
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/set.h>
+
+static struct nftnl_set *setup_set(uint8_t family, const char *table,
+                                const char *name)
+{
+       struct nftnl_set *s = NULL;
+
+       s = nftnl_set_alloc();
+       if (s == NULL) {
+               perror("OOM");
+               exit(EXIT_FAILURE);
+       }
+
+       nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
+       nftnl_set_set_str(s, NFTNL_SET_NAME, name);
+       nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family);
+       nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, 2);
+       /* See nftables/include/datatype.h, where TYPE_INET_SERVICE is 13. We
+        * should place these datatypes in a public header so third party
+        * applications still work with nftables.
+        */
+       nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13);
+       nftnl_set_set_u32(s, NFTNL_SET_DATA_LEN, 2);
+       nftnl_set_set_u32(s, NFTNL_SET_DATA_TYPE, 13);
+       nftnl_set_set_u32(s, NFTNL_SET_ID, 1);
+       nftnl_set_set_u32(s, NFTNL_SET_FLAGS, NFT_SET_CONSTANT | NFT_SET_MAP);
+
+       return s;
+}
+
+static void nftnl_mnl_batch_put(char *buf, uint16_t type, uint32_t seq)
+{
+       struct nlmsghdr *nlh;
+       struct nfgenmsg *nfg;
+
+       nlh = mnl_nlmsg_put_header(buf);
+       nlh->nlmsg_type = type;
+       nlh->nlmsg_flags = NLM_F_REQUEST;
+       nlh->nlmsg_seq = seq;
+
+       nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+       nfg->nfgen_family = AF_INET;
+       nfg->version = NFNETLINK_V0;
+       nfg->res_id = NFNL_SUBSYS_NFTABLES;
+}
+
+int main(int argc, char *argv[])
+{
+       struct mnl_socket *nl;
+       struct nftnl_set *s;
+       struct nlmsghdr *nlh;
+       struct mnl_nlmsg_batch *batch;
+       uint8_t family;
+       char buf[MNL_SOCKET_BUFFER_SIZE];
+       uint32_t seq = time(NULL);
+       int ret;
+
+       if (argc != 4) {
+               fprintf(stderr, "Usage: %s <family> <table> <setname>\n", argv[0]);
+               exit(EXIT_FAILURE);
+       }
+
+       if (strcmp(argv[1], "ip") == 0)
+               family = NFPROTO_IPV4;
+       else if (strcmp(argv[1], "ip6") == 0)
+               family = NFPROTO_IPV6;
+       else if (strcmp(argv[1], "bridge") == 0)
+               family = NFPROTO_BRIDGE;
+       else if (strcmp(argv[1], "arp") == 0)
+               family = NFPROTO_ARP;
+       else {
+               fprintf(stderr, "Unknown family: ip, ip6, bridge, arp\n");
+               exit(EXIT_FAILURE);
+       }
+
+       s = setup_set(family, argv[2], argv[3]);
+
+       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);
+       }
+
+       batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+       nftnl_mnl_batch_put(mnl_nlmsg_batch_current(batch),
+                         NFNL_MSG_BATCH_BEGIN, seq++);
+       mnl_nlmsg_batch_next(batch);
+
+       nlh = nftnl_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+                                     NFT_MSG_NEWSET, family,
+                                     NLM_F_CREATE|NLM_F_ACK, seq++);
+
+       nftnl_set_nlmsg_build_payload(nlh, s);
+       nftnl_set_free(s);
+       mnl_nlmsg_batch_next(batch);
+
+       nftnl_mnl_batch_put(mnl_nlmsg_batch_current(batch), NFNL_MSG_BATCH_END,
+                        seq++);
+       mnl_nlmsg_batch_next(batch);
+
+       ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+                               mnl_nlmsg_batch_size(batch));
+       if (ret == -1) {
+               perror("mnl_socket_sendto");
+               exit(EXIT_FAILURE);
+       }
+
+       mnl_nlmsg_batch_stop(batch);
+
+       ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+       if (ret == -1) {
+               perror("mnl_socket_recvfrom");
+               exit(EXIT_FAILURE);
+       }
+
+       ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
+       if (ret < 0) {
+               perror("mnl_cb_run");
+               exit(EXIT_FAILURE);
+       }
+
+       mnl_socket_close(nl);
+
+       return EXIT_SUCCESS;
+}