From 5274cb3ce09c40cccd29ec771ad49a2069aa37c4 Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sun, 17 Aug 2025 12:09:12 +0200
Subject: ipcpd: Add ipcpd over UDP/IPv6

This adds an IPCP that runs over UDP/IPv6. It's structured like the
eth-dix and eth-llc in that it builds two separate binaries:
ipcpd-udp4 and ipcpd-udp6. The IRM CLI is backwards compatible in that
type 'udp' will resolve to type 'udp4'.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
---
 include/ouroboros/ipcp.h     | 38 +++++++++++++++++++++++++++-----------
 include/ouroboros/protobuf.h | 11 ++++++++---
 2 files changed, 35 insertions(+), 14 deletions(-)

(limited to 'include')

diff --git a/include/ouroboros/ipcp.h b/include/ouroboros/ipcp.h
index 26fcdec4..c397f250 100644
--- a/include/ouroboros/ipcp.h
+++ b/include/ouroboros/ipcp.h
@@ -26,6 +26,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <stdbool.h>
+#include <netinet/in.h>
 #include <sys/types.h>
 
 #define IPCP_NAME_SIZE  255
@@ -49,7 +50,8 @@ enum ipcp_type { /* IRMd uses order to select an IPCP for flow allocation. */
         IPCP_BROADCAST,
         IPCP_ETH_LLC,
         IPCP_ETH_DIX,
-        IPCP_UDP,
+        IPCP_UDP4,
+        IPCP_UDP6,
         IPCP_INVALID
 };
 
@@ -257,10 +259,16 @@ struct eth_config {
         uint16_t ethertype; /* DIX only*/
 };
 
-struct udp_config {
-        uint32_t ip_addr;
-        uint32_t dns_addr;
-        uint16_t port;
+struct udp4_config {
+        struct in_addr ip_addr;
+        struct in_addr dns_addr;
+        uint16_t       port;
+};
+
+struct udp6_config {
+        struct in6_addr ip_addr;
+        struct in6_addr dns_addr;
+        uint16_t        port;
 };
 
 /* Layers */
@@ -276,9 +284,10 @@ struct ipcp_config {
         enum ipcp_type    type;
 
         union {
-                struct uni_config unicast;
-                struct udp_config udp;
-                struct eth_config eth;
+                struct uni_config  unicast;
+                struct udp4_config udp4;
+                struct udp6_config udp6;
+                struct eth_config  eth;
         };
 };
 
@@ -307,9 +316,16 @@ static const struct ipcp_config eth_llc_default_conf = {
         }
 };
 
-static const struct ipcp_config udp_default_conf = {
-        .type = IPCP_UDP,
-        .udp = {
+static const struct ipcp_config udp4_default_conf = {
+        .type = IPCP_UDP4,
+        .udp4 = {
+                .port = 3435
+        }
+};
+
+static const struct ipcp_config udp6_default_conf = {
+        .type = IPCP_UDP6,
+        .udp6 = {
                 .port = 3435
         }
 };
diff --git a/include/ouroboros/protobuf.h b/include/ouroboros/protobuf.h
index 6cb24c2f..780d58dc 100644
--- a/include/ouroboros/protobuf.h
+++ b/include/ouroboros/protobuf.h
@@ -38,7 +38,8 @@ typedef DtConfigMsg      dt_config_msg_t;
 typedef DirConfigMsg     dir_config_msg_t;
 typedef DirDhtConfigMsg  dir_dht_config_msg_t;
 typedef EthConfigMsg     eth_config_msg_t;
-typedef UdpConfigMsg     udp_config_msg_t;
+typedef Udp4ConfigMsg    udp4_config_msg_t;
+typedef Udp6ConfigMsg    udp6_config_msg_t;
 typedef UniConfigMsg     uni_config_msg_t;
 
 #include "ipcp.pb-c.h"
@@ -94,9 +95,13 @@ eth_config_msg_t *  eth_config_s_to_msg(const struct eth_config * s);
 
 struct eth_config   eth_config_msg_to_s(const eth_config_msg_t * msg);
 
-udp_config_msg_t *  udp_config_s_to_msg(const struct udp_config * s);
+udp4_config_msg_t * udp4_config_s_to_msg(const struct udp4_config * s);
 
-struct udp_config   udp_config_msg_to_s(const udp_config_msg_t * msg);
+struct udp4_config  udp4_config_msg_to_s(const udp4_config_msg_t * msg);
+
+udp6_config_msg_t * udp6_config_s_to_msg(const struct udp6_config * s);
+
+struct udp6_config  udp6_config_msg_to_s(const udp6_config_msg_t * msg);
 
 ipcp_config_msg_t * ipcp_config_s_to_msg(const struct ipcp_config * s);
 
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