sync-mode: add unicast UDP support to propagate state-changes

This patch adds support for unicast UDP to the channel
infrastructure. With this patch, you can select UDP unicast to
propagate state-changes instead of multicast.

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

1 files changed, 58 insertions, 0 deletions

diff --git a/include/udp.h b/include/udp.h
new file mode 100644
index 0000000..02b8af1
--- /dev/null
+++ b/include/udp.h
@@ -0,0 +1,58 @@
+#ifndef _UDP_H_
+#define _UDP_H_
+
+#include <stdint.h>
+#include <netinet/in.h>
+
+struct udp_conf {
+	int ipproto;
+	int reuseaddr;
+	int checksum;
+	unsigned short port;
+	union {
+		struct in_addr inet_addr;
+		struct in6_addr inet_addr6;
+	} server;
+	union {
+		struct in_addr inet_addr;
+		struct in6_addr inet_addr6;
+	} client;
+	int sndbuf;
+	int rcvbuf;
+};
+
+struct udp_stats {
+	uint64_t bytes;
+	uint64_t messages;
+	uint64_t error;
+};
+
+struct udp_sock {
+	int fd;
+	union {
+		struct sockaddr_in ipv4;
+		struct sockaddr_in6 ipv6;
+	} addr;
+	socklen_t sockaddr_len;
+	struct udp_stats stats;
+};
+
+struct udp_sock *udp_server_create(struct udp_conf *conf);
+void udp_server_destroy(struct udp_sock *m);
+
+struct udp_sock *udp_client_create(struct udp_conf *conf);
+void udp_client_destroy(struct udp_sock *m);
+
+ssize_t udp_send(struct udp_sock *m, const void *data, int size);
+ssize_t udp_recv(struct udp_sock *m, void *data, int size);
+
+int udp_get_fd(struct udp_sock *m);
+
+int udp_snprintf_stats(char *buf, size_t buflen, char *ifname,
+		       struct udp_stats *s, struct udp_stats *r);
+
+int udp_snprintf_stats2(char *buf, size_t buflen, const char *ifname,
+			const char *status, int active,
+			struct udp_stats *s, struct udp_stats *r);
+
+#endif