DHCP Multiple Servers (VPP-602, VPP-605)

Multiple DHCP (4 and/or 6) servers can be added and removed through multiple calls to the 'set dhcp server' API.
All 4/6/ discover/solicit messages will then be replicated to all servers in the list. The expectation is that the servers/system is configured in such a way that this is viable.
If VSS information is providied for the clinet VRF which also has multiple servers configured, then the same VSS information is sent to each server. Likewise the source address of packets sent to from VPP to each server is the same.

Change-Id: I3287cb084c84b3f612b78bc69cfcb5b9c1f8934d
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 47 insertions, 19 deletions

diff --git a/src/vnet/dhcp/dhcp_api.c b/src/vnet/dhcp/dhcp_api.c
index ce34f6a47b3..e9c757e85b6 100644
--- a/src/vnet/dhcp/dhcp_api.c
+++ b/src/vnet/dhcp/dhcp_api.c
@@ -24,6 +24,7 @@
 #include <vnet/api_errno.h>
 #include <vnet/dhcp/dhcp_proxy.h>
 #include <vnet/dhcp/client.h>
+#include <vnet/fib/fib_table.h>
 
 #include <vnet/vnet_msg_enum.h>
 
@@ -113,46 +114,73 @@ vl_api_dhcp_proxy_dump_t_handler (vl_api_dhcp_proxy_dump_t * mp)
   if (q == 0)
     return;
 
-  dhcp_proxy_dump ((mp->is_ip6 == 0 ?
+  dhcp_proxy_dump ((mp->is_ip6 == 1 ?
 		    FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4), q, mp->context);
 }
 
 void
 dhcp_send_details (fib_protocol_t proto,
-		   void *opaque,
-		   u32 context,
-		   const ip46_address_t * server,
-		   const ip46_address_t * src,
-		   u32 server_fib_id,
-		   u32 rx_fib_id, u32 vss_fib_id, u32 vss_oui)
+		   void *opaque, u32 context, dhcp_proxy_t * proxy)
 {
   vl_api_dhcp_proxy_details_t *mp;
   unix_shared_memory_queue_t *q = opaque;
-
-  mp = vl_msg_api_alloc (sizeof (*mp));
+  vl_api_dhcp_server_t *v_server;
+  dhcp_server_t *server;
+  fib_table_t *s_fib;
+  dhcp_vss_t *vss;
+  u32 count;
+  size_t n;
+
+  count = vec_len (proxy->dhcp_servers);
+  n = sizeof (*mp) + (count * sizeof (vl_api_dhcp_server_t));
+  mp = vl_msg_api_alloc (n);
   if (!mp)
     return;
-  memset (mp, 0, sizeof (*mp));
+  memset (mp, 0, n);
   mp->_vl_msg_id = ntohs (VL_API_DHCP_PROXY_DETAILS);
   mp->context = context;
-
-  mp->rx_vrf_id = htonl (rx_fib_id);
-  mp->server_vrf_id = htonl (server_fib_id);
-  mp->vss_oui = htonl (vss_oui);
-  mp->vss_fib_id = htonl (vss_fib_id);
+  mp->count = count;
 
   mp->is_ipv6 = (proto == FIB_PROTOCOL_IP6);
+  mp->rx_vrf_id =
+    htonl (dhcp_proxy_rx_table_get_table_id (proto, proxy->rx_fib_index));
+
+  vss = dhcp_get_vss_info (&dhcp_proxy_main, proxy->rx_fib_index, proto);
+
+  if (NULL != vss)
+    {
+      mp->vss_oui = htonl (vss->oui);
+      mp->vss_fib_id = htonl (vss->fib_id);
+    }
+
+  vec_foreach_index (count, proxy->dhcp_servers)
+  {
+    server = &proxy->dhcp_servers[count];
+    v_server = &mp->servers[count];
+
+    s_fib = fib_table_get (server->server_fib_index, proto);
+
+    v_server->server_vrf_id = htonl (s_fib->ft_table_id);
+
+    if (mp->is_ipv6)
+      {
+	memcpy (v_server->dhcp_server, &server->dhcp_server.ip6, 16);
+      }
+    else
+      {
+	/* put the address in the first bytes */
+	memcpy (v_server->dhcp_server, &server->dhcp_server.ip4, 4);
+      }
+  }
 
   if (mp->is_ipv6)
     {
-      memcpy (mp->dhcp_server, server, 16);
-      memcpy (mp->dhcp_src_address, src, 16);
+      memcpy (mp->dhcp_src_address, &proxy->dhcp_src_address.ip6, 16);
     }
   else
     {
       /* put the address in the first bytes */
-      memcpy (mp->dhcp_server, &server->ip4, 4);
-      memcpy (mp->dhcp_src_address, &src->ip4, 4);
+      memcpy (mp->dhcp_src_address, &proxy->dhcp_src_address.ip4, 4);
     }
   vl_msg_api_send_shmem (q, (u8 *) & mp);
 }