VPP-25 Add API for GRE tunnel create/delete/show.

Add API methods to create, delete and show GRE tunnels.

Also add missing CLI functionality for deleting and listing
configured tunnels.

Change-Id: I7565966037d94ade07938e4ff0d9333419716857
Signed-off-by: Chris Luke <chrisy@flirble.org>

3 files changed, 157 insertions, 0 deletions

diff --git a/vpp/api/api.c b/vpp/api/api.c
index 9c988a18172..eaae51a5eac 100644
--- a/vpp/api/api.c
+++ b/vpp/api/api.c
@@ -64,6 +64,7 @@
 #include <vnet/classify/input_acl.h>
 #include <vnet/l2/l2_classify.h>
 #include <vnet/vxlan/vxlan.h>
+#include <vnet/gre/gre.h>
 #include <vnet/l2/l2_vtr.h>
 #include <vnet/nsh-gre/nsh_gre.h>
 #include <vnet/nsh-vxlan-gpe/nsh_vxlan_gpe.h>
@@ -272,6 +273,8 @@ _(L2TPV3_SET_LOOKUP_KEY, l2tpv3_set_lookup_key)                         \
 _(SW_IF_L2TPV3_TUNNEL_DUMP, sw_if_l2tpv3_tunnel_dump)                   \
 _(VXLAN_ADD_DEL_TUNNEL, vxlan_add_del_tunnel)                           \
 _(VXLAN_TUNNEL_DUMP, vxlan_tunnel_dump)                                 \
+_(GRE_ADD_DEL_TUNNEL, gre_add_del_tunnel)                               \
+_(GRE_TUNNEL_DUMP, gre_tunnel_dump)                                     \
 _(L2_FIB_CLEAR_TABLE, l2_fib_clear_table)                               \
 _(L2_INTERFACE_EFP_FILTER, l2_interface_efp_filter)                     \
 _(L2_INTERFACE_VLAN_TAG_REWRITE, l2_interface_vlan_tag_rewrite)         \
@@ -4286,6 +4289,95 @@ static void vl_api_vxlan_tunnel_dump_t_handler
     }
 }
 
+static void vl_api_gre_add_del_tunnel_t_handler
+(vl_api_gre_add_del_tunnel_t * mp)
+{
+    vl_api_gre_add_del_tunnel_reply_t * rmp;
+    int rv = 0;
+    vnet_gre_add_del_tunnel_args_t _a, *a = &_a;
+    u32 outer_table_id;
+    uword * p;
+    ip4_main_t * im = &ip4_main;
+    u32 sw_if_index = ~0;
+
+    p = hash_get (im->fib_index_by_table_id, ntohl(mp->outer_table_id));
+    if (! p) {
+        rv = VNET_API_ERROR_NO_SUCH_FIB;
+        goto out;
+    }
+    outer_table_id = p[0];
+
+    /* Check src & dst are different */
+    if (memcmp(&mp->src_address, &mp->dst_address, 4) == 0) {
+        rv = VNET_API_ERROR_SAME_SRC_DST;
+        goto out;
+    }
+
+    memset (a, 0, sizeof (*a));
+
+    a->is_add = mp->is_add;
+
+    /* ip addresses sent in network byte order */
+    a->src.as_u32 = mp->src_address;
+    a->dst.as_u32 = mp->dst_address;
+
+    a->outer_table_id = outer_table_id;
+    rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
+
+out:
+    REPLY_MACRO2(VL_API_GRE_ADD_DEL_TUNNEL_REPLY,
+    ({
+        rmp->sw_if_index = ntohl (sw_if_index);
+    }));
+}
+
+static void send_gre_tunnel_details
+(gre_tunnel_t * t, unix_shared_memory_queue_t * q)
+{
+    vl_api_gre_tunnel_details_t * rmp;
+    ip4_main_t * im = &ip4_main;
+
+    rmp = vl_msg_api_alloc (sizeof (*rmp));
+    memset (rmp, 0, sizeof (*rmp));
+    rmp->_vl_msg_id = ntohs(VL_API_GRE_TUNNEL_DETAILS);
+    rmp->src_address = t->tunnel_src.data_u32;
+    rmp->dst_address = t->tunnel_dst.data_u32;
+    rmp->outer_table_id = htonl(im->fibs[t->outer_fib_index].table_id);
+    rmp->sw_if_index = htonl(t->sw_if_index);
+
+    vl_msg_api_send_shmem (q, (u8 *)&rmp);
+}
+
+static void vl_api_gre_tunnel_dump_t_handler
+(vl_api_gre_tunnel_dump_t * mp)
+{
+    unix_shared_memory_queue_t * q;
+    gre_main_t * gm = &gre_main;
+    gre_tunnel_t * t;
+    u32 sw_if_index;
+
+    q = vl_api_client_index_to_input_queue (mp->client_index);
+    if (q == 0) {
+        return;
+    }
+
+    sw_if_index = ntohl(mp->sw_if_index);
+
+    if (~0 == sw_if_index) {
+        pool_foreach (t, gm->tunnels,
+        ({
+            send_gre_tunnel_details(t, q);
+        }));
+    } else {
+        if ((sw_if_index >= vec_len(gm->tunnel_index_by_sw_if_index)) ||
+                (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index])) {
+            return;
+        }
+        t = &gm->tunnels[gm->tunnel_index_by_sw_if_index[sw_if_index]];
+        send_gre_tunnel_details(t, q);
+    }
+}
+
 static void 
 vl_api_l2_patch_add_del_t_handler (vl_api_l2_patch_add_del_t *mp)
 {
diff --git a/vpp/api/custom_dump.c b/vpp/api/custom_dump.c
index f4e5e75a99e..cd17328edb4 100644
--- a/vpp/api/custom_dump.c
+++ b/vpp/api/custom_dump.c
@@ -1297,6 +1297,40 @@ static void * vl_api_vxlan_tunnel_dump_t_print
     FINISH;
 }
 
+static void * vl_api_gre_add_del_tunnel_t_print
+(vl_api_gre_add_del_tunnel_t * mp, void *handle)
+{
+    u8 * s;
+
+    s = format (0, "SCRIPT: gre_add_del_tunnel ");
+
+    s = format (s, "dst %U ", format_ip4_address,
+                (ip4_address_t *)&(mp->dst_address));
+
+    s = format (s, "src %U ", format_ip4_address,
+                (ip4_address_t *)&(mp->src_address));
+
+    if (mp->outer_table_id)
+        s = format (s, "outer-fib-id %d ", ntohl(mp->outer_table_id));
+
+    if (mp->is_add == 0)
+        s = format (s, "del ");
+
+    FINISH;
+}
+
+static void * vl_api_gre_tunnel_dump_t_print
+(vl_api_gre_tunnel_dump_t * mp, void *handle)
+{
+    u8 * s;
+
+    s = format (0, "SCRIPT: gre_tunnel_dump ");
+
+    s = format (s, "sw_if_index %d ", ntohl(mp->sw_if_index));
+
+    FINISH;
+}
+
 static void *vl_api_l2_fib_clear_table_t_print
 (vl_api_l2_fib_clear_table_t * mp, void *handle)
 {
@@ -1795,6 +1829,8 @@ _(L2TPV3_SET_LOOKUP_KEY, l2tpv3_set_lookup_key)                         \
 _(SW_IF_L2TPV3_TUNNEL_DUMP, sw_if_l2tpv3_tunnel_dump)                   \
 _(VXLAN_ADD_DEL_TUNNEL, vxlan_add_del_tunnel)                           \
 _(VXLAN_TUNNEL_DUMP, vxlan_tunnel_dump)                                 \
+_(GRE_ADD_DEL_TUNNEL, gre_add_del_tunnel)                               \
+_(GRE_TUNNEL_DUMP, gre_tunnel_dump)                                     \
 _(L2_FIB_CLEAR_TABLE, l2_fib_clear_table)                               \
 _(L2_INTERFACE_EFP_FILTER, l2_interface_efp_filter)                     \
 _(L2_INTERFACE_VLAN_TAG_REWRITE, l2_interface_vlan_tag_rewrite)         \
diff --git a/vpp/api/vpe.api b/vpp/api/vpe.api
index 52893b58ef0..88b6070083d 100644
--- a/vpp/api/vpe.api
+++ b/vpp/api/vpe.api
@@ -1799,6 +1799,35 @@ manual_java define vxlan_tunnel_details {
     u32 vni;
     u8 is_ipv6;
 };
+
+define gre_add_del_tunnel {
+    u32 client_index;
+    u32 context;
+    u8 is_add;
+    u32 src_address;
+    u32 dst_address;
+    u32 outer_table_id;
+};
+
+define gre_add_del_tunnel_reply {
+    u32 context;
+    i32 retval;
+    u32 sw_if_index;
+};
+
+manual_java define gre_tunnel_dump {
+    u32 client_index;
+    u32 context;
+    u32 sw_if_index;
+};
+
+manual_java define gre_tunnel_details {
+    u32 context;
+    u32 sw_if_index;
+    u32 src_address;
+    u32 dst_address;
+    u32 outer_table_id;
+};
   
 /** \brief L2 interface vlan tag rewrite configure request
     @param client_index - opaque cookie to identify the sender