irmd: flow allocation and fast path

This commit has a first implementation of flow allocation (the "slow
path") and read/write (the "fast path") for ouroboros. It provides
basic but unstable communications over the shared memory.

It required a lot of changes all over the stack, and fixes a number of
previously undetected issues.

This PR still need heavy revision regarding data model, locking and
cleanup.

lib/dev: modifications to the API. It now uses an ap_init() call to
set the AP name and sets the Instance ID to the pid of the process. It
also binds the AP to the shared memory and creates tables for mappings
in the fast path. A call to ap_fini() releases the resources.

lib/shm_ap_rbuff: added ring buffer for data exchange between
processes in the fast path. It passes an index in the shm_du_map.

lib/shm_du_map: rewrote API to work with calls from dev.c. Garbage
collector added. Tests updated to new API.

ipcpd/ipcp-data: removed everything related to flows, as these are
universal for all ap's and kept in ap_data (dev.c), or similar structs
for shim ipcps.

shim-udp: added flow allocator and read/write functions and shm
elements.

irmd: revised data model and structures necessary for flow allocation.

tools: echo updated to new dev.h API.

messaging system was updated to comply with new flow allocation
messages. All exchanges use pid and port_id to bootstrap the fast
path.

1 files changed, 12 insertions, 8 deletions

diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index d6f373cd..13632a80 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -45,11 +45,12 @@ int ipcp_arg_check(int argc, char * argv[])
         return 0;
 }
 
-int ipcp_main_loop(struct ipcp * _ipcp)
+void * ipcp_main_loop(void * o)
 {
         int     lsockfd;
         int     sockfd;
         uint8_t buf[IPCP_MSG_BUF_SIZE];
+        struct ipcp * _ipcp = (struct ipcp *) o;
 
         ipcp_msg_t *    msg;
         ssize_t         count;
@@ -61,13 +62,13 @@ int ipcp_main_loop(struct ipcp * _ipcp)
 
         if (_ipcp == NULL) {
                 LOG_ERR("Invalid ipcp struct.");
-                return 1;
+                return (void *) 1;
         }
 
         sockfd = server_socket_open(ipcp_sock_path(getpid()));
         if (sockfd < 0) {
                 LOG_ERR("Could not open server socket.");
-                return 1;
+                return (void *) 1;
         }
 
         while (true) {
@@ -113,7 +114,7 @@ int ipcp_main_loop(struct ipcp * _ipcp)
                                 conf.max_pdu_size    = conf_msg->max_pdu_size;
                         }
                         if (conf_msg->ipcp_type == IPCP_SHIM_UDP) {
-                                conf.ip_addr = conf_msg->ip_addr;
+                                conf.ip_addr  = conf_msg->ip_addr;
                                 conf.dns_addr = conf_msg->dns_addr;
                         }
 
@@ -149,7 +150,8 @@ int ipcp_main_loop(struct ipcp * _ipcp)
                         }
                         ret_msg.has_result = true;
                         ret_msg.result =
-                                _ipcp->ops->ipcp_unreg(msg->dif_names, msg->len);
+                                _ipcp->ops->ipcp_unreg(msg->dif_names,
+                                                       msg->len);
                         break;
                 case IPCP_MSG_CODE__IPCP_NAME_REG:
                         if (_ipcp->ops->ipcp_name_reg == NULL) {
@@ -172,9 +174,10 @@ int ipcp_main_loop(struct ipcp * _ipcp)
                                 LOG_ERR("Flow_alloc unsupported.");
                                 break;
                         }
-                        ret_msg.has_fd = true;
-                        ret_msg.fd =
+                        ret_msg.has_result = true;
+                        ret_msg.result =
                                 _ipcp->ops->ipcp_flow_alloc(msg->port_id,
+                                                            msg->pid,
                                                             msg->dst_name,
                                                             msg->src_ap_name,
                                                             msg->src_ae_name,
@@ -188,6 +191,7 @@ int ipcp_main_loop(struct ipcp * _ipcp)
                         ret_msg.has_result = true;
                         ret_msg.result =
                                 _ipcp->ops->ipcp_flow_alloc_resp(msg->port_id,
+                                                                 msg->pid,
                                                                  msg->result);
                         break;
                 case IPCP_MSG_CODE__IPCP_FLOW_DEALLOC:
@@ -231,5 +235,5 @@ int ipcp_main_loop(struct ipcp * _ipcp)
                 close(lsockfd);
         }
 
-        return 0;
+        return NULL;
 }