lib: Replace shim IPCPs with points of attachment

Removes the UDP and Ethernet shim IPCPs. The unicast and broadcast
IPCPs can now directly attach to a "legacy" socket. We adopt Saltzer's
Point-of-Attachment terminology, also advocated in Day's "Patterns in
Network Architecture". The "poa" component manages these
PoA's with one management thread, one link monitoring thread and one
thread per attached point.

For Ethernet PoA's the irm connect and enroll can resolve the
destination IPCP or Layer name with a broadcast name query over the
attached PoAs (first reply wins). UDP PoA's require a destination IP
address or FQDN.

attach to a local endpoint (required both server and client side):

 irm ipcp poa attach name a udp 10.0.0.1
 irm ipcp poa attach name a udp 10.0.0.1:3435
 irm ipcp poa attach name a udp [::1]:3435
 irm ipcp poa attach name a eth dev eth0
 irm ipcp poa attach name a eth dev eth0 ethertype 0xA000

release a PoA (refused while it carries a flow):

 irm ipcp poa detach name a udp 10.0.0.1:3435
 irm ipcp poa detach name a eth eth0

list an IPCP's PoAs:

 irm ipcp poa list name a

connect to a peer, by name or at an address:

 irm ipcp connect name b dst a
 irm ipcp connect name b dst a eth
 irm ipcp connect name b dst a eth dev eth0
 irm ipcp connect name b dst a udp 10.0.0.1:3435
 irm ipcp connect name b dst a udp peer.example.com:3435

disconnect by peer name, no address:

 irm ipcp disconnect name b dst a
 irm ipcp disconnect name b dst a component mgmt

enroll has the same shape as connect:

 irm ipcp enroll name b layer lr autobind
 irm ipcp enroll name b layer lr autobind eth dev eth0
 irm ipcp enroll name b layer lr autobind udp 10.0.0.1:3435

the IRMd config file attaches PoAs and names peers the same way:

 udp = [ "10.0.0.1", "10.0.0.1:3436" ]
 eth = [ "eth0", {dev="eth1", ethertype=0xA007} ]

 enrol={dst="LAN", eth={dev="eth0"}}
 conn=[{dst="lan3", eth={}}, {dst="lan4", udp="10.0.0.1:3435"}]

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

1 files changed, 36 insertions, 17 deletions

diff --git a/src/irmd/irmd.h b/src/irmd/irmd.h
index f88378ad..9d42e248 100644
--- a/src/irmd/irmd.h
+++ b/src/irmd/irmd.h
@@ -26,29 +26,48 @@
 #include <ouroboros/ipcp.h>
 #include <ouroboros/irm.h>
 
-int create_ipcp(struct ipcp_info * info);
+int     create_ipcp(struct ipcp_info * info);
 
-int bootstrap_ipcp(pid_t                pid,
-                   struct ipcp_config * conf);
+int     bootstrap_ipcp(pid_t                pid,
+                       struct ipcp_config * conf);
 
-int enroll_ipcp(pid_t        pid,
-                const char * dst);
+int     enroll_ipcp(pid_t                   pid,
+                    const char *            dst,
+                    const struct poa_addr * addr);
 
-int connect_ipcp(pid_t        pid,
-                 const char * dst,
-                 const char * component,
-                 qosspec_t    qs);
+int     enroll_ipcp_resolve(pid_t             pid,
+                            const char *      dst,
+                            struct poa_addr * addr);
 
-int name_create(struct name_info * info);
+int     attach_ipcp(pid_t                   pid,
+                    const struct poa_spec * poa,
+                    bool                    attach);
 
-int name_reg(const char * name,
-             pid_t        pid);
+ssize_t list_poas(pid_t              pid,
+                  struct poa_spec ** eps);
 
-int bind_process(pid_t        pid,
-                 const char * name);
+int     connect_ipcp(pid_t                   pid,
+                     const char *            dst,
+                     const char *            component,
+                     qosspec_t               qs,
+                     const struct poa_addr * addr);
 
-int bind_program(char **      exec,
-                 const char * name,
-                 uint8_t      flags);
+int     connect_ipcp_resolve(pid_t             pid,
+                             const char *      dst,
+                             const char *      component,
+                             qosspec_t         qs,
+                             struct poa_addr * addr);
+
+int     name_create(struct name_info * info);
+
+int     name_reg(const char * name,
+                 pid_t        pid);
+
+int     bind_process(pid_t        pid,
+                     const char * name);
+
+int     bind_program(char **      exec,
+                     const char * name,
+                     uint8_t      flags);
 
 #endif /* OUROBOROS_IRMD_H*/