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-rw-r--r--examples/nft-ct-expectation-add.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/examples/nft-ct-expectation-add.c b/examples/nft-ct-expectation-add.c
new file mode 100644
index 0000000..d9b9cdb
--- /dev/null
+++ b/examples/nft-ct-expectation-add.c
@@ -0,0 +1,153 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * 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 <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+
+#include <obj.h>
+#include <libmnl/libmnl.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static uint8_t parse_l4proto(char *str)
+{
+ if (strcmp(str, "udp") == 0)
+ return IPPROTO_UDP;
+ else if (strcmp(str, "tcp") == 0)
+ return IPPROTO_TCP;
+ else {
+ fprintf(stderr, "Unknown l4proto: tcp, udp\n");
+ exit(EXIT_FAILURE);
+ }
+ return IPPROTO_TCP;
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+ uint16_t family, l3proto, dport;
+ uint8_t l4proto, size;
+ struct nftnl_obj *t;
+ uint32_t timeout;
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ return NULL;
+ }
+
+ family = parse_family(argv[1], "family");
+ nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+ nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+ nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+ if (argc > 8) {
+ l3proto = parse_family(argv[8], "l3proto");
+ nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_L3PROTO, l3proto);
+ }
+ l4proto = parse_l4proto(argv[4]);
+ nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_L4PROTO, l4proto);
+ dport = atoi(argv[5]);
+ nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_DPORT, dport);
+ timeout = atol(argv[6]);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_CT_EXPECT_TIMEOUT, timeout);
+ size = atoi(argv[7]);
+ nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_SIZE, size);
+
+ return t;
+}
+
+int main(int argc, char *argv[])
+{
+ uint32_t portid, seq, obj_seq, family;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct mnl_nlmsg_batch *batch;
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ struct nftnl_obj *t;
+ int ret;
+
+ if (argc < 8 || argc > 9) {
+ fprintf(stderr, "%s <family> <table> <name> <l4proto> <dport> <timeout> <size> [l3proto]\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ t = obj_parse(argc, argv);
+ if (t == NULL) {
+ exit(EXIT_FAILURE);
+ }
+
+ seq = time(NULL);
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+ nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ obj_seq = seq;
+ family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+ nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_NEWOBJ, family,
+ NLM_F_ACK | NLM_F_CREATE, seq++);
+ nftnl_obj_nlmsg_build_payload(nlh, t);
+ nftnl_obj_free(t);
+ mnl_nlmsg_batch_next(batch);
+
+ nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ 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, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch)) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_nlmsg_batch_stop(batch);
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, obj_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;
+}