ipcpd: refactor IPCP configuration

The ipcp configuration struct now has internal structures for the
different IPCPs and for IPCP components of the unicast IPCP.

Split the very long IPCP main loop into individual handler functions.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

2 files changed, 60 insertions, 52 deletions

diff --git a/src/lib/ipcp_config.proto b/src/lib/ipcp_config.proto
index 812d909b..c6481b09 100644
--- a/src/lib/ipcp_config.proto
+++ b/src/lib/ipcp_config.proto
@@ -27,24 +27,36 @@ message layer_info_msg {
         required uint32 dir_hash_algo =  2;
 }
 
+message dt_config_msg {
+        required uint32 addr_size    = 1;
+        required uint32 eid_size     = 2;
+        required uint32 max_ttl      = 3;
+        required uint32 routing_type = 4;
+}
+
+message uni_config_msg {
+        required dt_config_msg dt      = 1;
+        required uint32 addr_auth_type = 2;
+        required uint32 cong_avoid     = 3;
+}
+
+message eth_config_msg {
+        required string dev       = 1;
+        optional uint32 ethertype = 2;
+}
+
+message udp_config_msg {
+        required uint32 ip_addr  = 1;
+        required uint32 port     = 2;
+        required uint32 dns_addr = 3; /* set to 0 if unused */
+}
+
 message ipcp_config_msg {
         required layer_info_msg layer_info =  1;
         required int32 ipcp_type           =  2;
-        // Config for unicast IPCP
-        optional uint32 addr_size          =  3;
-        optional uint32 eid_size           =  4;
-        optional uint32 max_ttl            =  5;
-        optional uint32 addr_auth_type     =  6;
-        optional uint32 routing_type       =  7;
-        optional uint32 cong_avoid         =  8;
-        // Config for UDP
-        optional uint32 ip_addr            =  9;
-        optional uint32 dns_addr           = 10;
-        optional uint32 port               = 11;
-        // Config for the Ethernet
-        optional string dev                = 12;
-        // Config for DIX Ethernet
-        optional uint32 ethertype          = 13;
+        optional uni_config_msg unicast    =  3;
+        optional udp_config_msg udp        =  4;
+        optional eth_config_msg eth        =  5;
 }
 
 enum enroll_code {
diff --git a/src/lib/irm.c b/src/lib/irm.c
index dbc1c556..2a8aa05c 100644
--- a/src/lib/irm.c
+++ b/src/lib/irm.c
@@ -98,11 +98,15 @@ int irm_destroy_ipcp(pid_t pid)
 int irm_bootstrap_ipcp(pid_t                      pid,
                        const struct ipcp_config * conf)
 {
-        irm_msg_t         msg        = IRM_MSG__INIT;
-        ipcp_config_msg_t config     = IPCP_CONFIG_MSG__INIT;
-        layer_info_msg_t  layer_info = LAYER_INFO_MSG__INIT;
-        irm_msg_t *       recv_msg   = NULL;
-        int               ret        = -1;
+        irm_msg_t         msg            = IRM_MSG__INIT;
+        ipcp_config_msg_t cfg_msg        = IPCP_CONFIG_MSG__INIT;
+        layer_info_msg_t  layer_info_msg = LAYER_INFO_MSG__INIT;
+        dt_config_msg_t   dt_cfg_msg     = DT_CONFIG_MSG__INIT;
+        uni_config_msg_t  uni_cfg_msg    = UNI_CONFIG_MSG__INIT;
+        eth_config_msg_t  eth_cfg_msg    = ETH_CONFIG_MSG__INIT;
+        udp_config_msg_t  udp_cfg_msg    = UDP_CONFIG_MSG__INIT;
+        irm_msg_t *       recv_msg       = NULL;
+        int               ret            = -1;
 
         if (pid == -1 || conf == NULL)
                 return -EINVAL;
@@ -111,54 +115,46 @@ int irm_bootstrap_ipcp(pid_t                      pid,
         msg.has_pid = true;
         msg.pid     = pid;
 
-        config.layer_info     = &layer_info;
-        msg.conf              = &config;
-        layer_info.layer_name = (char *) conf->layer_info.layer_name;
-
-        config.ipcp_type = conf->type;
-
-        if (conf->type != IPCP_UDP)
-                layer_info.dir_hash_algo  = conf->layer_info.dir_hash_algo;
+        cfg_msg.ipcp_type = conf->type;
+        layer_info_msg.layer_name = (char *) conf->layer_info.layer_name;
+        layer_info_msg.dir_hash_algo  = conf->layer_info.dir_hash_algo;
 
         switch (conf->type) {
         case IPCP_UNICAST:
-                config.has_addr_size      = true;
-                config.addr_size          = conf->addr_size;
-                config.has_eid_size       = true;
-                config.eid_size           = conf->eid_size;
-                config.has_max_ttl        = true;
-                config.max_ttl            = conf->max_ttl;
-                config.has_addr_auth_type = true;
-                config.addr_auth_type     = conf->addr_auth_type;
-                config.has_routing_type   = true;
-                config.routing_type       = conf->routing_type;
-                config.has_cong_avoid     = true;
-                config.cong_avoid         = conf->cong_avoid;
+                dt_cfg_msg.addr_size       = conf->unicast.dt.addr_size;
+                dt_cfg_msg.eid_size        = conf->unicast.dt.eid_size;
+                dt_cfg_msg.max_ttl         = conf->unicast.dt.max_ttl;
+                dt_cfg_msg.routing_type    = conf->unicast.dt.routing_type;
+                uni_cfg_msg.dt             = &dt_cfg_msg;
+                uni_cfg_msg.addr_auth_type = conf->unicast.addr_auth_type;
+                uni_cfg_msg.cong_avoid     = conf->unicast.cong_avoid;
+                cfg_msg.unicast            = &uni_cfg_msg;
                 break;
         case IPCP_UDP:
-                config.has_ip_addr  = true;
-                config.ip_addr      = conf->ip_addr;
-                config.has_dns_addr = true;
-                config.dns_addr     = conf->dns_addr;
-                config.has_port     = true;
-                config.port         = conf->port;
+                udp_cfg_msg.ip_addr  = conf->udp.ip_addr;
+                udp_cfg_msg.dns_addr = conf->udp.dns_addr;
+                udp_cfg_msg.port     = conf->udp.port;
+                cfg_msg.udp          = &udp_cfg_msg;
                 break;
         case IPCP_LOCAL:
                 /* FALLTHRU */
         case IPCP_BROADCAST:
                 break;
-        case IPCP_ETH_LLC:
-                config.dev = conf->dev;
-                break;
         case IPCP_ETH_DIX:
-                config.dev = conf->dev;
-                config.has_ethertype = true;
-                config.ethertype = conf->ethertype;
+                eth_cfg_msg.has_ethertype = true;
+                eth_cfg_msg.ethertype     = conf->eth.ethertype;
+                /* FALLTHRU */
+        case IPCP_ETH_LLC:
+                eth_cfg_msg.dev = conf->eth.dev;
+                cfg_msg.eth = &eth_cfg_msg;
                 break;
         default:
                 return -EIPCPTYPE;
         }
 
+        cfg_msg.layer_info = &layer_info_msg;
+        msg.conf           = &cfg_msg;
+
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL)
                 return -EIRMD;