aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/gre
diff options
context:
space:
mode:
authorDamjan Marion <damarion@cisco.com>2016-12-19 23:05:39 +0100
committerDamjan Marion <damarion@cisco.com>2016-12-28 12:25:14 +0100
commit7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 (patch)
tree5de62f8dbd3a752f5a676ca600e43d2652d1ff1a /src/vnet/gre
parent696f1adec0df3b8f161862566dd9c86174302658 (diff)
Reorganize source tree to use single autotools instance
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/gre')
-rw-r--r--src/vnet/gre/error.def23
-rw-r--r--src/vnet/gre/gre.api57
-rw-r--r--src/vnet/gre/gre.c455
-rw-r--r--src/vnet/gre/gre.h235
-rw-r--r--src/vnet/gre/gre_api.c204
-rw-r--r--src/vnet/gre/interface.c606
-rw-r--r--src/vnet/gre/node.c531
-rw-r--r--src/vnet/gre/packet.h55
-rw-r--r--src/vnet/gre/pg.c77
9 files changed, 2243 insertions, 0 deletions
diff --git a/src/vnet/gre/error.def b/src/vnet/gre/error.def
new file mode 100644
index 00000000..161ecc1d
--- /dev/null
+++ b/src/vnet/gre/error.def
@@ -0,0 +1,23 @@
+/*
+ * gre_error.def: gre errors
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+gre_error (NONE, "no error")
+gre_error (UNKNOWN_PROTOCOL, "unknown protocol")
+gre_error (UNSUPPORTED_VERSION, "unsupported version")
+gre_error (PKTS_DECAP, "GRE input packets decapsulated")
+gre_error (PKTS_ENCAP, "GRE output packets encapsulated")
+gre_error (NO_SUCH_TUNNEL, "GRE input packets dropped due to missing tunnel")
diff --git a/src/vnet/gre/gre.api b/src/vnet/gre/gre.api
new file mode 100644
index 00000000..28f6dbc9
--- /dev/null
+++ b/src/vnet/gre/gre.api
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2015-2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+define gre_add_del_tunnel
+{
+ u32 client_index;
+ u32 context;
+ u8 is_add;
+ u8 is_ipv6;
+ u8 teb;
+ u8 src_address[16];
+ u8 dst_address[16];
+ u32 outer_fib_id;
+};
+
+define gre_add_del_tunnel_reply
+{
+ u32 context;
+ i32 retval;
+ u32 sw_if_index;
+};
+
+define gre_tunnel_dump
+{
+ u32 client_index;
+ u32 context;
+ u32 sw_if_index;
+};
+
+define gre_tunnel_details
+{
+ u32 context;
+ u32 sw_if_index;
+ u8 is_ipv6;
+ u8 teb;
+ u8 src_address[16];
+ u8 dst_address[16];
+ u32 outer_fib_id;
+};
+
+/*
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/gre/gre.c b/src/vnet/gre/gre.c
new file mode 100644
index 00000000..0faed13e
--- /dev/null
+++ b/src/vnet/gre/gre.c
@@ -0,0 +1,455 @@
+/*
+ * gre.c: gre
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/gre/gre.h>
+#include <vnet/adj/adj_midchain.h>
+
+gre_main_t gre_main;
+
+typedef struct {
+ union {
+ ip4_and_gre_header_t ip4_and_gre;
+ u64 as_u64[3];
+ };
+} ip4_and_gre_union_t;
+
+
+/* Packet trace structure */
+typedef struct {
+ /* Tunnel-id / index in tunnel vector */
+ u32 tunnel_id;
+
+ /* pkt length */
+ u32 length;
+
+ /* tunnel ip4 addresses */
+ ip4_address_t src;
+ ip4_address_t dst;
+} gre_tx_trace_t;
+
+u8 * format_gre_tx_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ gre_tx_trace_t * t = va_arg (*args, gre_tx_trace_t *);
+
+ s = format (s, "GRE: tunnel %d len %d src %U dst %U",
+ t->tunnel_id, clib_net_to_host_u16 (t->length),
+ format_ip4_address, &t->src.as_u8,
+ format_ip4_address, &t->dst.as_u8);
+ return s;
+}
+
+u8 * format_gre_protocol (u8 * s, va_list * args)
+{
+ gre_protocol_t p = va_arg (*args, u32);
+ gre_main_t * gm = &gre_main;
+ gre_protocol_info_t * pi = gre_get_protocol_info (gm, p);
+
+ if (pi)
+ s = format (s, "%s", pi->name);
+ else
+ s = format (s, "0x%04x", p);
+
+ return s;
+}
+
+u8 * format_gre_header_with_length (u8 * s, va_list * args)
+{
+ gre_main_t * gm = &gre_main;
+ gre_header_t * h = va_arg (*args, gre_header_t *);
+ u32 max_header_bytes = va_arg (*args, u32);
+ gre_protocol_t p = clib_net_to_host_u16 (h->protocol);
+ uword indent, header_bytes;
+
+ header_bytes = sizeof (h[0]);
+ if (max_header_bytes != 0 && header_bytes > max_header_bytes)
+ return format (s, "gre header truncated");
+
+ indent = format_get_indent (s);
+
+ s = format (s, "GRE %U", format_gre_protocol, p);
+
+ if (max_header_bytes != 0 && header_bytes > max_header_bytes)
+ {
+ gre_protocol_info_t * pi = gre_get_protocol_info (gm, p);
+ vlib_node_t * node = vlib_get_node (gm->vlib_main, pi->node_index);
+ if (node->format_buffer)
+ s = format (s, "\n%U%U",
+ format_white_space, indent,
+ node->format_buffer, (void *) (h + 1),
+ max_header_bytes - header_bytes);
+ }
+
+ return s;
+}
+
+u8 * format_gre_header (u8 * s, va_list * args)
+{
+ gre_header_t * h = va_arg (*args, gre_header_t *);
+ return format (s, "%U", format_gre_header_with_length, h, 0);
+}
+
+/* Returns gre protocol as an int in host byte order. */
+uword
+unformat_gre_protocol_host_byte_order (unformat_input_t * input,
+ va_list * args)
+{
+ u16 * result = va_arg (*args, u16 *);
+ gre_main_t * gm = &gre_main;
+ int i;
+
+ /* Named type. */
+ if (unformat_user (input, unformat_vlib_number_by_name,
+ gm->protocol_info_by_name, &i))
+ {
+ gre_protocol_info_t * pi = vec_elt_at_index (gm->protocol_infos, i);
+ *result = pi->protocol;
+ return 1;
+ }
+
+ return 0;
+}
+
+uword
+unformat_gre_protocol_net_byte_order (unformat_input_t * input,
+ va_list * args)
+{
+ u16 * result = va_arg (*args, u16 *);
+ if (! unformat_user (input, unformat_gre_protocol_host_byte_order, result))
+ return 0;
+ *result = clib_host_to_net_u16 ((u16) *result);
+ return 1;
+}
+
+uword
+unformat_gre_header (unformat_input_t * input, va_list * args)
+{
+ u8 ** result = va_arg (*args, u8 **);
+ gre_header_t _h, * h = &_h;
+ u16 p;
+
+ if (! unformat (input, "%U",
+ unformat_gre_protocol_host_byte_order, &p))
+ return 0;
+
+ h->protocol = clib_host_to_net_u16 (p);
+
+ /* Add header to result. */
+ {
+ void * p;
+ u32 n_bytes = sizeof (h[0]);
+
+ vec_add2 (*result, p, n_bytes);
+ clib_memcpy (p, h, n_bytes);
+ }
+
+ return 1;
+}
+
+static int
+gre_proto_from_vnet_link (vnet_link_t link)
+{
+ switch (link)
+ {
+ case VNET_LINK_IP4:
+ return (GRE_PROTOCOL_ip4);
+ case VNET_LINK_IP6:
+ return (GRE_PROTOCOL_ip6);
+ case VNET_LINK_MPLS:
+ return (GRE_PROTOCOL_mpls_unicast);
+ case VNET_LINK_ETHERNET:
+ return (GRE_PROTOCOL_teb);
+ case VNET_LINK_ARP:
+ return (GRE_PROTOCOL_arp);
+ }
+ ASSERT(0);
+ return (GRE_PROTOCOL_ip4);
+}
+
+static u8*
+gre_build_rewrite (vnet_main_t * vnm,
+ u32 sw_if_index,
+ vnet_link_t link_type,
+ const void *dst_address)
+{
+ gre_main_t * gm = &gre_main;
+ ip4_and_gre_header_t * h;
+ u8* rewrite = NULL;
+ gre_tunnel_t *t;
+ u32 ti;
+
+ ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
+
+ if (~0 == ti)
+ /* not one of ours */
+ return (0);
+
+ t = pool_elt_at_index(gm->tunnels, ti);
+
+ vec_validate(rewrite, sizeof(*h)-1);
+ h = (ip4_and_gre_header_t*)rewrite;
+ h->gre.protocol = clib_host_to_net_u16(gre_proto_from_vnet_link(link_type));
+
+ h->ip4.ip_version_and_header_length = 0x45;
+ h->ip4.ttl = 254;
+ h->ip4.protocol = IP_PROTOCOL_GRE;
+ /* fixup ip4 header length and checksum after-the-fact */
+ h->ip4.src_address.as_u32 = t->tunnel_src.as_u32;
+ h->ip4.dst_address.as_u32 = t->tunnel_dst.as_u32;
+ h->ip4.checksum = ip4_header_checksum (&h->ip4);
+
+ return (rewrite);
+}
+
+void
+gre_fixup (vlib_main_t *vm,
+ ip_adjacency_t *adj,
+ vlib_buffer_t *b0)
+{
+ ip4_header_t * ip0;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* Fixup the checksum and len fields in the GRE tunnel encap
+ * that was applied at the midchain node */
+ ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+ ip0->checksum = ip4_header_checksum (ip0);
+}
+
+void
+gre_update_adj (vnet_main_t * vnm,
+ u32 sw_if_index,
+ adj_index_t ai)
+{
+ adj_nbr_midchain_update_rewrite (ai, gre_fixup,
+ ADJ_MIDCHAIN_FLAG_NONE,
+ gre_build_rewrite(vnm, sw_if_index,
+ adj_get_link_type(ai),
+ NULL));
+
+ gre_tunnel_stack(ai);
+}
+
+/**
+ * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
+ */
+static uword
+gre_interface_tx_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ gre_main_t * gm = &gre_main;
+ u32 next_index;
+ u32 * from, * to_next, n_left_from, n_left_to_next;
+ vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
+ const gre_tunnel_t *gt = pool_elt_at_index (gm->tunnels, rd->dev_instance);
+
+ /* Vector of buffer / pkt indices we're supposed to process */
+ from = vlib_frame_vector_args (frame);
+
+ /* Number of buffers / pkts */
+ n_left_from = frame->n_vectors;
+
+ /* Speculatively send the first buffer to the last disposition we used */
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ /* set up to enqueue to our disposition with index = next_index */
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ /*
+ * FIXME DUAL LOOP
+ */
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t * b0;
+ u32 bi0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer(vm, bi0);
+
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = gt->l2_adj_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = gt - gm->tunnels;
+ tr->length = vlib_buffer_length_in_chain (vm, b0);
+ tr->src.as_u32 = gt->tunnel_src.as_u32;
+ tr->dst.as_u32 = gt->tunnel_src.as_u32;
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, gt->l2_tx_arc);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, gre_input_node.index,
+ GRE_ERROR_PKTS_ENCAP, frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+static uword
+gre_interface_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (gre_interface_tx_inline (vm, node, frame));
+}
+
+static uword
+gre_teb_interface_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (gre_interface_tx_inline (vm, node, frame));
+}
+
+static u8 * format_gre_tunnel_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "gre%d", dev_instance);
+}
+
+static u8 * format_gre_tunnel_teb_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "teb-gre%d", dev_instance);
+}
+
+static u8 * format_gre_device (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ CLIB_UNUSED (int verbose) = va_arg (*args, int);
+
+ s = format (s, "GRE tunnel: id %d\n", dev_instance);
+ return s;
+}
+
+VNET_DEVICE_CLASS (gre_device_class) = {
+ .name = "GRE tunnel device",
+ .format_device_name = format_gre_tunnel_name,
+ .format_device = format_gre_device,
+ .format_tx_trace = format_gre_tx_trace,
+ .tx_function = gre_interface_tx,
+ .admin_up_down_function = gre_interface_admin_up_down,
+#ifdef SOON
+ .clear counter = 0;
+#endif
+};
+
+VLIB_DEVICE_TX_FUNCTION_MULTIARCH (gre_device_class,
+ gre_interface_tx)
+
+VNET_DEVICE_CLASS (gre_device_teb_class) = {
+ .name = "GRE TEB tunnel device",
+ .format_device_name = format_gre_tunnel_teb_name,
+ .format_device = format_gre_device,
+ .format_tx_trace = format_gre_tx_trace,
+ .tx_function = gre_teb_interface_tx,
+ .admin_up_down_function = gre_interface_admin_up_down,
+#ifdef SOON
+ .clear counter = 0;
+#endif
+};
+
+VLIB_DEVICE_TX_FUNCTION_MULTIARCH (gre_device_teb_class,
+ gre_teb_interface_tx)
+
+VNET_HW_INTERFACE_CLASS (gre_hw_interface_class) = {
+ .name = "GRE",
+ .format_header = format_gre_header_with_length,
+ .unformat_header = unformat_gre_header,
+ .build_rewrite = gre_build_rewrite,
+ .update_adjacency = gre_update_adj,
+ .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
+};
+
+static void add_protocol (gre_main_t * gm,
+ gre_protocol_t protocol,
+ char * protocol_name)
+{
+ gre_protocol_info_t * pi;
+ u32 i;
+
+ vec_add2 (gm->protocol_infos, pi, 1);
+ i = pi - gm->protocol_infos;
+
+ pi->name = protocol_name;
+ pi->protocol = protocol;
+ pi->next_index = pi->node_index = ~0;
+
+ hash_set (gm->protocol_info_by_protocol, protocol, i);
+ hash_set_mem (gm->protocol_info_by_name, pi->name, i);
+}
+
+static clib_error_t * gre_init (vlib_main_t * vm)
+{
+ gre_main_t * gm = &gre_main;
+ clib_error_t * error;
+ ip_main_t * im = &ip_main;
+ ip_protocol_info_t * pi;
+
+ memset (gm, 0, sizeof (gm[0]));
+ gm->vlib_main = vm;
+ gm->vnet_main = vnet_get_main();
+
+ if ((error = vlib_call_init_function (vm, ip_main_init)))
+ return error;
+
+ if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
+ return error;
+
+ /* Set up the ip packet generator */
+ pi = ip_get_protocol_info (im, IP_PROTOCOL_GRE);
+ pi->format_header = format_gre_header;
+ pi->unformat_pg_edit = unformat_pg_gre_header;
+
+ gm->protocol_info_by_name = hash_create_string (0, sizeof (uword));
+ gm->protocol_info_by_protocol = hash_create (0, sizeof (uword));
+ gm->tunnel_by_key = hash_create (0, sizeof (uword));
+
+#define _(n,s) add_protocol (gm, GRE_PROTOCOL_##s, #s);
+ foreach_gre_protocol
+#undef _
+
+ return vlib_call_init_function (vm, gre_input_init);
+}
+
+VLIB_INIT_FUNCTION (gre_init);
+
+gre_main_t * gre_get_main (vlib_main_t * vm)
+{
+ vlib_call_init_function (vm, gre_init);
+ return &gre_main;
+}
+
diff --git a/src/vnet/gre/gre.h b/src/vnet/gre/gre.h
new file mode 100644
index 00000000..b6544b9b
--- /dev/null
+++ b/src/vnet/gre/gre.h
@@ -0,0 +1,235 @@
+/*
+ * gre.h: types/functions for gre.
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_gre_h
+#define included_gre_h
+
+#include <vnet/vnet.h>
+#include <vnet/gre/packet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip4.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ip/format.h>
+#include <vnet/adj/adj_types.h>
+
+extern vnet_hw_interface_class_t gre_hw_interface_class;
+
+typedef enum {
+#define gre_error(n,s) GRE_ERROR_##n,
+#include <vnet/gre/error.def>
+#undef gre_error
+ GRE_N_ERROR,
+} gre_error_t;
+
+/**
+ * A GRE payload protocol registration
+ */
+typedef struct {
+ /** Name (a c string). */
+ char * name;
+
+ /** GRE protocol type in host byte order. */
+ gre_protocol_t protocol;
+
+ /** Node which handles this type. */
+ u32 node_index;
+
+ /** Next index for this type. */
+ u32 next_index;
+} gre_protocol_info_t;
+
+/**
+ * @brief The GRE tunnel type
+ */
+typedef enum gre_tunnel_tyoe_t_
+{
+ /**
+ * L3 GRE (i.e. this tunnel is in L3 mode)
+ */
+ GRE_TUNNEL_TYPE_L3,
+ /**
+ * Transparent Ethernet Bridging - the tunnel is in L2 mode
+ */
+ GRE_TUNNEL_TYPE_TEB,
+} gre_tunnel_type_t;
+
+#define GRE_TUNNEL_TYPE_NAMES { \
+ [GRE_TUNNEL_TYPE_L3] = "L3", \
+ [GRE_TUNNEL_TYPE_TEB] = "TEB", \
+}
+
+#define GRE_TUNNEL_N_TYPES ((gre_tunnel_type_t)GRE_TUNNEL_TYPE_TEB+1)
+
+/**
+ * @brief A representation of a GRE tunnel
+ */
+typedef struct {
+ /**
+ * Linkage into the FIB object graph
+ */
+ fib_node_t node;
+
+ /**
+ * The tunnel's source/local address
+ */
+ ip4_address_t tunnel_src;
+ /**
+ * The tunnel's destination/remote address
+ */
+ ip4_address_t tunnel_dst;
+ /**
+ * The FIB in which the src.dst address are present
+ */
+ u32 outer_fib_index;
+ u32 hw_if_index;
+ u32 sw_if_index;
+ gre_tunnel_type_t type;
+
+ /**
+ * The FIB entry sourced by the tunnel for its destination prefix
+ */
+ fib_node_index_t fib_entry_index;
+
+ /**
+ * The tunnel is a child of the FIB entry for its desintion. This is
+ * so it receives updates when the forwarding information for that entry
+ * changes.
+ * The tunnels sibling index on the FIB entry's dependency list.
+ */
+ u32 sibling_index;
+
+ /**
+ * on a L2 tunnel this is the VLIB arc from the L2-tx to the l2-midchain
+ */
+ u32 l2_tx_arc;
+
+ /**
+ * an L2 tunnel always rquires an L2 midchain. cache here for DP.
+ */
+ adj_index_t l2_adj_index;
+} gre_tunnel_t;
+
+/**
+ * @brief GRE related global data
+ */
+typedef struct {
+ /**
+ * pool of tunnel instances
+ */
+ gre_tunnel_t *tunnels;
+
+ /**
+ * GRE payload protocol registrations
+ */
+ gre_protocol_info_t * protocol_infos;
+
+ /**
+ * Hash tables mapping name/protocol to protocol info index.
+ */
+ uword * protocol_info_by_name, * protocol_info_by_protocol;
+ /**
+ * Hash mapping src/dst addr pair to tunnel
+ */
+ uword * tunnel_by_key;
+
+ /**
+ * Free vlib hw_if_indices.
+ * A free list per-tunnel type since the interfaces ctreated are fo different
+ * types and we cannot change the type.
+ */
+ u32 * free_gre_tunnel_hw_if_indices[GRE_TUNNEL_N_TYPES];
+
+ /**
+ * Mapping from sw_if_index to tunnel index
+ */
+ u32 * tunnel_index_by_sw_if_index;
+
+ /* convenience */
+ vlib_main_t * vlib_main;
+ vnet_main_t * vnet_main;
+} gre_main_t;
+
+/**
+ * @brief IPv4 and GRE header.
+ */
+typedef CLIB_PACKED (struct {
+ ip4_header_t ip4;
+ gre_header_t gre;
+}) ip4_and_gre_header_t;
+
+always_inline gre_protocol_info_t *
+gre_get_protocol_info (gre_main_t * em, gre_protocol_t protocol)
+{
+ uword * p = hash_get (em->protocol_info_by_protocol, protocol);
+ return p ? vec_elt_at_index (em->protocol_infos, p[0]) : 0;
+}
+
+gre_main_t gre_main;
+
+/* Register given node index to take input for given gre type. */
+void
+gre_register_input_type (vlib_main_t * vm,
+ gre_protocol_t protocol,
+ u32 node_index);
+
+extern clib_error_t * gre_interface_admin_up_down (vnet_main_t * vnm,
+ u32 hw_if_index,
+ u32 flags);
+
+extern void gre_tunnel_stack (adj_index_t ai);
+extern void gre_update_adj (vnet_main_t * vnm,
+ u32 sw_if_index,
+ adj_index_t ai);
+
+format_function_t format_gre_protocol;
+format_function_t format_gre_header;
+format_function_t format_gre_header_with_length;
+
+extern vlib_node_registration_t gre_input_node;
+extern vnet_device_class_t gre_device_class;
+extern vnet_device_class_t gre_device_teb_class;
+
+/* Parse gre protocol as 0xXXXX or protocol name.
+ In either host or network byte order. */
+unformat_function_t unformat_gre_protocol_host_byte_order;
+unformat_function_t unformat_gre_protocol_net_byte_order;
+
+/* Parse gre header. */
+unformat_function_t unformat_gre_header;
+unformat_function_t unformat_pg_gre_header;
+
+void
+gre_register_input_protocol (vlib_main_t * vm,
+ gre_protocol_t protocol,
+ u32 node_index);
+
+/* manually added to the interface output node in gre.c */
+#define GRE_OUTPUT_NEXT_LOOKUP 1
+
+typedef struct {
+ u8 is_add;
+
+ ip4_address_t src, dst;
+ u32 outer_fib_id;
+ u8 teb;
+} vnet_gre_add_del_tunnel_args_t;
+
+int vnet_gre_add_del_tunnel
+ (vnet_gre_add_del_tunnel_args_t *a, u32 * sw_if_indexp);
+
+#endif /* included_gre_h */
diff --git a/src/vnet/gre/gre_api.c b/src/vnet/gre/gre_api.c
new file mode 100644
index 00000000..333838c0
--- /dev/null
+++ b/src/vnet/gre/gre_api.c
@@ -0,0 +1,204 @@
+/*
+ *------------------------------------------------------------------
+ * gre_api.c - gre api
+ *
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <vnet/vnet.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+
+#include <vnet/gre/gre.h>
+#include <vnet/fib/fib_table.h>
+
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs /* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun /* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+
+#define foreach_vpe_api_msg \
+_(GRE_ADD_DEL_TUNNEL, gre_add_del_tunnel) \
+_(GRE_TUNNEL_DUMP, gre_tunnel_dump)
+
+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_fib_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_fib_id));
+ if (!p)
+ {
+ rv = VNET_API_ERROR_NO_SUCH_FIB;
+ goto out;
+ }
+ outer_fib_id = p[0];
+
+ /* Check src & dst are different */
+ if ((mp->is_ipv6 && memcmp (mp->src_address, mp->dst_address, 16) == 0) ||
+ (!mp->is_ipv6 && 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;
+ a->teb = mp->teb;
+
+ /* ip addresses sent in network byte order */
+ clib_memcpy (&(a->src), mp->src_address, 4);
+ clib_memcpy (&(a->dst), mp->dst_address, 4);
+
+ a->outer_fib_id = outer_fib_id;
+ rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
+
+out:
+ /* *INDENT-OFF* */
+ REPLY_MACRO2(VL_API_GRE_ADD_DEL_TUNNEL_REPLY,
+ ({
+ rmp->sw_if_index = ntohl (sw_if_index);
+ }));
+ /* *INDENT-ON* */
+}
+
+static void send_gre_tunnel_details
+ (gre_tunnel_t * t, unix_shared_memory_queue_t * q, u32 context)
+{
+ 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);
+ clib_memcpy (rmp->src_address, &(t->tunnel_src), 4);
+ clib_memcpy (rmp->dst_address, &(t->tunnel_dst), 4);
+ rmp->outer_fib_id = htonl (im->fibs[t->outer_fib_index].ft_table_id);
+ rmp->teb = (GRE_TUNNEL_TYPE_TEB == t->type);
+ rmp->sw_if_index = htonl (t->sw_if_index);
+ rmp->context = context;
+
+ 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)
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (t, gm->tunnels,
+ ({
+ send_gre_tunnel_details(t, q, mp->context);
+ }));
+ /* *INDENT-ON* */
+ }
+ 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, mp->context);
+ }
+}
+
+/*
+ * gre_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+#define vl_msg_name_crc_list
+#include <vnet/vnet_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+ foreach_vl_msg_name_crc_gre;
+#undef _
+}
+
+static clib_error_t *
+gre_api_hookup (vlib_main_t * vm)
+{
+ api_main_t *am = &api_main;
+
+#define _(N,n) \
+ vl_msg_api_set_handlers(VL_API_##N, #n, \
+ vl_api_##n##_t_handler, \
+ vl_noop_handler, \
+ vl_api_##n##_t_endian, \
+ vl_api_##n##_t_print, \
+ sizeof(vl_api_##n##_t), 1);
+ foreach_vpe_api_msg;
+#undef _
+
+ /*
+ * Set up the (msg_name, crc, message-id) table
+ */
+ setup_message_id_table (am);
+
+ return 0;
+}
+
+VLIB_API_INIT_FUNCTION (gre_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/gre/interface.c b/src/vnet/gre/interface.c
new file mode 100644
index 00000000..d624587d
--- /dev/null
+++ b/src/vnet/gre/interface.c
@@ -0,0 +1,606 @@
+/*
+ * gre_interface.c: gre interfaces
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/gre/gre.h>
+#include <vnet/ip/format.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/adj/adj_midchain.h>
+#include <vnet/adj/adj_nbr.h>
+#include <vnet/mpls/mpls.h>
+
+static const char *gre_tunnel_type_names[] = GRE_TUNNEL_TYPE_NAMES;
+
+static inline u64
+gre_mk_key (const ip4_address_t *src,
+ const ip4_address_t *dst,
+ u32 out_fib_index)
+{
+ // FIXME. the fib index should be part of the key
+ return ((u64)src->as_u32 << 32 | (u64)dst->as_u32);
+}
+
+static u8 *
+format_gre_tunnel_type (u8 * s, va_list * args)
+{
+ gre_tunnel_type_t type = va_arg (*args, gre_tunnel_type_t);
+
+ return (format(s, "%s", gre_tunnel_type_names[type]));
+}
+
+static u8 *
+format_gre_tunnel (u8 * s, va_list * args)
+{
+ gre_tunnel_t * t = va_arg (*args, gre_tunnel_t *);
+ gre_main_t * gm = &gre_main;
+
+ s = format (s,
+ "[%d] %U (src) %U (dst) payload %U outer_fib_index %d",
+ t - gm->tunnels,
+ format_ip4_address, &t->tunnel_src,
+ format_ip4_address, &t->tunnel_dst,
+ format_gre_tunnel_type, t->type,
+ t->outer_fib_index);
+
+ return s;
+}
+
+static gre_tunnel_t *
+gre_tunnel_db_find (const ip4_address_t *src,
+ const ip4_address_t *dst,
+ u32 out_fib_index)
+{
+ gre_main_t * gm = &gre_main;
+ uword * p;
+ u64 key;
+
+ key = gre_mk_key(src, dst, out_fib_index);
+
+ p = hash_get (gm->tunnel_by_key, key);
+
+ if (NULL == p)
+ return (NULL);
+
+ return (pool_elt_at_index (gm->tunnels, p[0]));
+}
+
+static void
+gre_tunnel_db_add (const gre_tunnel_t *t)
+{
+ gre_main_t * gm = &gre_main;
+ u64 key;
+
+ key = gre_mk_key(&t->tunnel_src, &t->tunnel_dst, t->outer_fib_index);
+ hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
+}
+
+static void
+gre_tunnel_db_remove (const gre_tunnel_t *t)
+{
+ gre_main_t * gm = &gre_main;
+ u64 key;
+
+ key = gre_mk_key(&t->tunnel_src, &t->tunnel_dst, t->outer_fib_index);
+ hash_unset (gm->tunnel_by_key, key);
+}
+
+static gre_tunnel_t *
+gre_tunnel_from_fib_node (fib_node_t *node)
+{
+#if (CLIB_DEBUG > 0)
+ ASSERT(FIB_NODE_TYPE_GRE_TUNNEL == node->fn_type);
+#endif
+ return ((gre_tunnel_t*) (((char*)node) -
+ STRUCT_OFFSET_OF(gre_tunnel_t, node)));
+}
+
+/**
+ * gre_tunnel_stack
+ *
+ * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
+ */
+void
+gre_tunnel_stack (adj_index_t ai)
+{
+ gre_main_t * gm = &gre_main;
+ ip_adjacency_t *adj;
+ gre_tunnel_t *gt;
+ u32 sw_if_index;
+
+ adj = adj_get(ai);
+ sw_if_index = adj->rewrite_header.sw_if_index;
+
+ if ((vec_len(gm->tunnel_index_by_sw_if_index) < sw_if_index) ||
+ (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
+ return;
+
+ gt = pool_elt_at_index(gm->tunnels,
+ gm->tunnel_index_by_sw_if_index[sw_if_index]);
+
+ /*
+ * find the adjacency that is contributed by the FIB entry
+ * that this tunnel resovles via, and use it as the next adj
+ * in the midchain
+ */
+ if (vnet_hw_interface_get_flags(vnet_get_main(),
+ gt->hw_if_index) &
+ VNET_HW_INTERFACE_FLAG_LINK_UP)
+ {
+ adj_nbr_midchain_stack(
+ ai,
+ fib_entry_contribute_ip_forwarding(gt->fib_entry_index));
+ }
+ else
+ {
+ adj_nbr_midchain_unstack(ai);
+ }
+}
+
+/**
+ * @brief Call back when restacking all adjacencies on a GRE interface
+ */
+static adj_walk_rc_t
+gre_adj_walk_cb (adj_index_t ai,
+ void *ctx)
+{
+ gre_tunnel_stack(ai);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static void
+gre_tunnel_restack (gre_tunnel_t *gt)
+{
+ fib_protocol_t proto;
+
+ /*
+ * walk all the adjacencies on th GRE interface and restack them
+ */
+ FOR_EACH_FIB_IP_PROTOCOL(proto)
+ {
+ adj_nbr_walk(gt->sw_if_index,
+ proto,
+ gre_adj_walk_cb,
+ NULL);
+ }
+}
+
+/**
+ * Function definition to backwalk a FIB node
+ */
+static fib_node_back_walk_rc_t
+gre_tunnel_back_walk (fib_node_t *node,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ gre_tunnel_restack(gre_tunnel_from_fib_node(node));
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+/**
+ * Function definition to get a FIB node from its index
+ */
+static fib_node_t*
+gre_tunnel_fib_node_get (fib_node_index_t index)
+{
+ gre_tunnel_t * gt;
+ gre_main_t * gm;
+
+ gm = &gre_main;
+ gt = pool_elt_at_index(gm->tunnels, index);
+
+ return (&gt->node);
+}
+
+/**
+ * Function definition to inform the FIB node that its last lock has gone.
+ */
+static void
+gre_tunnel_last_lock_gone (fib_node_t *node)
+{
+ /*
+ * The MPLS GRE tunnel is a root of the graph. As such
+ * it never has children and thus is never locked.
+ */
+ ASSERT(0);
+}
+
+/*
+ * Virtual function table registered by MPLS GRE tunnels
+ * for participation in the FIB object graph.
+ */
+const static fib_node_vft_t gre_vft = {
+ .fnv_get = gre_tunnel_fib_node_get,
+ .fnv_last_lock = gre_tunnel_last_lock_gone,
+ .fnv_back_walk = gre_tunnel_back_walk,
+};
+
+static int
+vnet_gre_tunnel_add (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
+{
+ gre_main_t * gm = &gre_main;
+ vnet_main_t * vnm = gm->vnet_main;
+ ip4_main_t * im = &ip4_main;
+ gre_tunnel_t * t;
+ vnet_hw_interface_t * hi;
+ u32 hw_if_index, sw_if_index;
+ u32 outer_fib_index;
+ u8 address[6];
+ clib_error_t *error;
+
+ outer_fib_index = ip4_fib_index_from_table_id(a->outer_fib_id);
+
+ if (~0 == outer_fib_index)
+ return VNET_API_ERROR_NO_SUCH_FIB;
+
+ t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id);
+
+ if (NULL != t)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
+ memset (t, 0, sizeof (*t));
+ fib_node_init(&t->node, FIB_NODE_TYPE_GRE_TUNNEL);
+
+ if (a->teb)
+ t->type = GRE_TUNNEL_TYPE_TEB;
+ else
+ t->type = GRE_TUNNEL_TYPE_L3;
+
+ if (vec_len (gm->free_gre_tunnel_hw_if_indices[t->type]) > 0) {
+ vnet_interface_main_t * im = &vnm->interface_main;
+
+ hw_if_index = gm->free_gre_tunnel_hw_if_indices[t->type]
+ [vec_len (gm->free_gre_tunnel_hw_if_indices[t->type])-1];
+ _vec_len (gm->free_gre_tunnel_hw_if_indices[t->type]) -= 1;
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+ hi->dev_instance = t - gm->tunnels;
+ hi->hw_instance = hi->dev_instance;
+
+ /* clear old stats of freed tunnel before reuse */
+ sw_if_index = hi->sw_if_index;
+ vnet_interface_counter_lock(im);
+ vlib_zero_combined_counter
+ (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX], sw_if_index);
+ vlib_zero_combined_counter
+ (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], sw_if_index);
+ vlib_zero_simple_counter
+ (&im->sw_if_counters[VNET_INTERFACE_COUNTER_DROP], sw_if_index);
+ vnet_interface_counter_unlock(im);
+ if (GRE_TUNNEL_TYPE_TEB == t->type)
+ {
+ t->l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
+ hi->tx_node_index,
+ "adj-l2-midchain");
+ }
+ } else {
+ if (GRE_TUNNEL_TYPE_TEB == t->type)
+ {
+ /* Default MAC address (d00b:eed0:0000 + sw_if_index) */
+ memset (address, 0, sizeof (address));
+ address[0] = 0xd0;
+ address[1] = 0x0b;
+ address[2] = 0xee;
+ address[3] = 0xd0;
+ address[4] = t - gm->tunnels;
+
+ error = ethernet_register_interface(vnm,
+ gre_device_teb_class.index,
+ t - gm->tunnels, address,
+ &hw_if_index,
+ 0);
+
+ if (error)
+ {
+ clib_error_report (error);
+ return VNET_API_ERROR_INVALID_REGISTRATION;
+ }
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+ t->l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
+ hi->tx_node_index,
+ "adj-l2-midchain");
+ } else {
+ hw_if_index = vnet_register_interface(vnm,
+ gre_device_class.index,
+ t - gm->tunnels,
+ gre_hw_interface_class.index,
+ t - gm->tunnels);
+ }
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+ sw_if_index = hi->sw_if_index;
+ }
+
+ t->hw_if_index = hw_if_index;
+ t->outer_fib_index = outer_fib_index;
+ t->sw_if_index = sw_if_index;
+ t->l2_adj_index = ADJ_INDEX_INVALID;
+
+ vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0);
+ gm->tunnel_index_by_sw_if_index[sw_if_index] = t - gm->tunnels;
+
+ vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
+
+ hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
+ hi->per_packet_overhead_bytes =
+ /* preamble */ 8 + /* inter frame gap */ 12;
+
+ /* Standard default gre MTU. */
+ hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
+
+ clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
+ clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst));
+
+ gre_tunnel_db_add(t);
+
+ /*
+ * source the FIB entry for the tunnel's destination
+ * and become a child thereof. The tunnel will then get poked
+ * when the forwarding for the entry updates, and the tunnel can
+ * re-stack accordingly
+ */
+ const fib_prefix_t tun_dst_pfx = {
+ .fp_len = 32,
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_addr = {
+ .ip4 = t->tunnel_dst,
+ }
+ };
+
+ t->fib_entry_index =
+ fib_table_entry_special_add(outer_fib_index,
+ &tun_dst_pfx,
+ FIB_SOURCE_RR,
+ FIB_ENTRY_FLAG_NONE,
+ ADJ_INDEX_INVALID);
+ t->sibling_index =
+ fib_entry_child_add(t->fib_entry_index,
+ FIB_NODE_TYPE_GRE_TUNNEL,
+ t - gm->tunnels);
+
+ clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
+ clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst));
+
+ if (GRE_TUNNEL_TYPE_TEB == t->type)
+ {
+ t->l2_adj_index = adj_nbr_add_or_lock(FIB_PROTOCOL_IP4,
+ VNET_LINK_ETHERNET,
+ &zero_addr,
+ sw_if_index);
+ gre_update_adj(vnm, t->sw_if_index, t->l2_adj_index);
+ }
+
+ if (sw_if_indexp)
+ *sw_if_indexp = sw_if_index;
+
+ return 0;
+}
+
+static int
+vnet_gre_tunnel_delete (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
+{
+ gre_main_t * gm = &gre_main;
+ vnet_main_t * vnm = gm->vnet_main;
+ gre_tunnel_t * t;
+ u32 sw_if_index;
+
+ t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id);
+
+ if (NULL == t)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+ sw_if_index = t->sw_if_index;
+ vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */);
+ /* make sure tunnel is removed from l2 bd or xconnect */
+ set_int_l2_mode(gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
+ vec_add1 (gm->free_gre_tunnel_hw_if_indices[t->type], t->hw_if_index);
+ gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
+
+ if (GRE_TUNNEL_TYPE_TEB == t->type)
+ adj_unlock(t->l2_adj_index);
+
+ if (t->l2_adj_index != ADJ_INDEX_INVALID)
+ adj_unlock(t->l2_adj_index);
+
+ fib_entry_child_remove(t->fib_entry_index,
+ t->sibling_index);
+ fib_table_entry_delete_index(t->fib_entry_index,
+ FIB_SOURCE_RR);
+
+ gre_tunnel_db_remove(t);
+ fib_node_deinit(&t->node);
+ pool_put (gm->tunnels, t);
+
+ if (sw_if_indexp)
+ *sw_if_indexp = sw_if_index;
+
+ return 0;
+}
+
+int
+vnet_gre_add_del_tunnel (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
+{
+ if (a->is_add)
+ return (vnet_gre_tunnel_add(a, sw_if_indexp));
+ else
+ return (vnet_gre_tunnel_delete(a, sw_if_indexp));
+}
+
+clib_error_t *
+gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
+{
+ gre_main_t * gm = &gre_main;
+ vnet_hw_interface_t * hi;
+ gre_tunnel_t *t;
+ u32 ti;
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+ if (NULL == gm->tunnel_index_by_sw_if_index ||
+ hi->sw_if_index >= vec_len(gm->tunnel_index_by_sw_if_index))
+ return (NULL);
+
+ ti = gm->tunnel_index_by_sw_if_index[hi->sw_if_index];
+
+ if (~0 == ti)
+ /* not one of ours */
+ return (NULL);
+
+ t = pool_elt_at_index(gm->tunnels, ti);
+
+ if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
+ vnet_hw_interface_set_flags (vnm, hw_if_index, VNET_HW_INTERFACE_FLAG_LINK_UP);
+ else
+ vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
+
+ gre_tunnel_restack(t);
+
+ return /* no error */ 0;
+}
+
+static clib_error_t *
+create_gre_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ unformat_input_t _line_input, * line_input = &_line_input;
+ vnet_gre_add_del_tunnel_args_t _a, * a = &_a;
+ ip4_address_t src, dst;
+ u32 outer_fib_id = 0;
+ u8 teb = 0;
+ int rv;
+ u32 num_m_args = 0;
+ u8 is_add = 1;
+ u32 sw_if_index;
+
+ /* Get a line of input. */
+ if (! unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
+ if (unformat (line_input, "del"))
+ is_add = 0;
+ else if (unformat (line_input, "src %U", unformat_ip4_address, &src))
+ num_m_args++;
+ else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst))
+ num_m_args++;
+ else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
+ ;
+ else if (unformat (line_input, "teb"))
+ teb = 1;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+ unformat_free (line_input);
+
+ if (num_m_args < 2)
+ return clib_error_return (0, "mandatory argument(s) missing");
+
+ if (memcmp (&src, &dst, sizeof(src)) == 0)
+ return clib_error_return (0, "src and dst are identical");
+
+ memset (a, 0, sizeof (*a));
+ a->outer_fib_id = outer_fib_id;
+ a->teb = teb;
+ clib_memcpy(&a->src, &src, sizeof(src));
+ clib_memcpy(&a->dst, &dst, sizeof(dst));
+
+ if (is_add)
+ rv = vnet_gre_tunnel_add(a, &sw_if_index);
+ else
+ rv = vnet_gre_tunnel_delete(a, &sw_if_index);
+
+ switch(rv)
+ {
+ case 0:
+ vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
+ break;
+ case VNET_API_ERROR_INVALID_VALUE:
+ return clib_error_return (0, "GRE tunnel already exists...");
+ case VNET_API_ERROR_NO_SUCH_FIB:
+ return clib_error_return (0, "outer fib ID %d doesn't exist\n",
+ outer_fib_id);
+ default:
+ return clib_error_return (0, "vnet_gre_add_del_tunnel returned %d", rv);
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = {
+ .path = "create gre tunnel",
+ .short_help = "create gre tunnel src <addr> dst <addr> "
+ "[outer-fib-id <fib>] [teb] [del]",
+ .function = create_gre_tunnel_command_fn,
+};
+
+static clib_error_t *
+show_gre_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ gre_main_t * gm = &gre_main;
+ gre_tunnel_t * t;
+ u32 ti = ~0;
+
+ if (pool_elts (gm->tunnels) == 0)
+ vlib_cli_output (vm, "No GRE tunnels configured...");
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%d", &ti))
+ ;
+ else
+ break;
+ }
+
+ if (~0 == ti)
+ {
+ pool_foreach (t, gm->tunnels,
+ ({
+ vlib_cli_output (vm, "%U", format_gre_tunnel, t);
+ }));
+ }
+ else
+ {
+ t = pool_elt_at_index(gm->tunnels, ti);
+
+ vlib_cli_output (vm, "%U", format_gre_tunnel, t);
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (show_gre_tunnel_command, static) = {
+ .path = "show gre tunnel",
+ .function = show_gre_tunnel_command_fn,
+};
+
+/* force inclusion from application's main.c */
+clib_error_t *gre_interface_init (vlib_main_t *vm)
+{
+ fib_node_register_type(FIB_NODE_TYPE_GRE_TUNNEL, &gre_vft);
+
+ return 0;
+}
+VLIB_INIT_FUNCTION(gre_interface_init);
diff --git a/src/vnet/gre/node.c b/src/vnet/gre/node.c
new file mode 100644
index 00000000..86f7a6ee
--- /dev/null
+++ b/src/vnet/gre/node.c
@@ -0,0 +1,531 @@
+/*
+ * node.c: gre packet processing
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <vnet/gre/gre.h>
+#include <vnet/mpls/mpls.h>
+#include <vppinfra/sparse_vec.h>
+
+#define foreach_gre_input_next \
+_(PUNT, "error-punt") \
+_(DROP, "error-drop") \
+_(ETHERNET_INPUT, "ethernet-input") \
+_(IP4_INPUT, "ip4-input") \
+_(IP6_INPUT, "ip6-input") \
+_(MPLS_INPUT, "mpls-input")
+
+typedef enum {
+#define _(s,n) GRE_INPUT_NEXT_##s,
+ foreach_gre_input_next
+#undef _
+ GRE_INPUT_N_NEXT,
+} gre_input_next_t;
+
+typedef struct {
+ u32 tunnel_id;
+ u32 length;
+ ip4_address_t src;
+ ip4_address_t dst;
+} gre_rx_trace_t;
+
+u8 * format_gre_rx_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ gre_rx_trace_t * t = va_arg (*args, gre_rx_trace_t *);
+
+ s = format (s, "GRE: tunnel %d len %d src %U dst %U",
+ t->tunnel_id, clib_net_to_host_u16(t->length),
+ format_ip4_address, &t->src.as_u8,
+ format_ip4_address, &t->dst.as_u8);
+ return s;
+}
+
+typedef struct {
+ /* Sparse vector mapping gre protocol in network byte order
+ to next index. */
+ u16 * next_by_protocol;
+} gre_input_runtime_t;
+
+static uword
+gre_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ gre_main_t * gm = &gre_main;
+ gre_input_runtime_t * rt = (void *) node->runtime_data;
+ __attribute__((unused)) u32 n_left_from, next_index, * from, * to_next;
+ u64 cached_tunnel_key = (u64) ~0;
+ u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_index = 0;
+
+ u32 cpu_index = os_get_cpu_number();
+ u32 len;
+ vnet_interface_main_t *im = &gm->vnet_main->interface_main;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t * b0, * b1;
+ gre_header_t * h0, * h1;
+ u16 version0, version1;
+ int verr0, verr1;
+ u32 i0, i1, next0, next1, protocol0, protocol1;
+ ip4_header_t *ip0, *ip1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
+ CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /* ip4_local hands us the ip header, not the gre header */
+ ip0 = vlib_buffer_get_current (b0);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* Save src + dst ip4 address, e.g. for mpls-o-gre */
+ vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
+ vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
+ vnet_buffer(b1)->gre.src = ip1->src_address.as_u32;
+ vnet_buffer(b1)->gre.dst = ip1->dst_address.as_u32;
+
+ vlib_buffer_advance (b0, sizeof (*ip0));
+ vlib_buffer_advance (b1, sizeof (*ip1));
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+
+ /* Index sparse array with network byte order. */
+ protocol0 = h0->protocol;
+ protocol1 = h1->protocol;
+ sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1,
+ &i0, &i1);
+ next0 = vec_elt(rt->next_by_protocol, i0);
+ next1 = vec_elt(rt->next_by_protocol, i1);
+
+ b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
+ b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
+
+ version0 = clib_net_to_host_u16 (h0->flags_and_version);
+ verr0 = version0 & GRE_VERSION_MASK;
+ version1 = clib_net_to_host_u16 (h1->flags_and_version);
+ verr1 = version1 & GRE_VERSION_MASK;
+
+ b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
+ : b0->error;
+ next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
+ b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
+ : b1->error;
+ next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1;
+
+
+ /* RPF check for ip4/ip6 input */
+ if (PREDICT_TRUE(next0 == GRE_INPUT_NEXT_IP4_INPUT
+ || next0 == GRE_INPUT_NEXT_IP6_INPUT
+ || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
+ || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b0)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (gm->tunnel_by_key, key);
+ if (!p)
+ {
+ next0 = GRE_INPUT_NEXT_DROP;
+ b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop0;
+ }
+ t = pool_elt_at_index (gm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (gm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ }
+ else
+ {
+ next0 = GRE_INPUT_NEXT_DROP;
+ goto drop0;
+ }
+ len = vlib_buffer_length_in_chain (vm, b0);
+ vlib_increment_combined_counter (im->combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX,
+ cpu_index,
+ tunnel_sw_if_index,
+ 1 /* packets */,
+ len /* bytes */);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+
+drop0:
+ if (PREDICT_TRUE(next1 == GRE_INPUT_NEXT_IP4_INPUT
+ || next1 == GRE_INPUT_NEXT_IP6_INPUT
+ || next1 == GRE_INPUT_NEXT_ETHERNET_INPUT
+ || next1 == GRE_INPUT_NEXT_MPLS_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b1)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b1)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (gm->tunnel_by_key, key);
+ if (!p)
+ {
+ next1 = GRE_INPUT_NEXT_DROP;
+ b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop1;
+ }
+ t = pool_elt_at_index (gm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (gm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ }
+ else
+ {
+ next1 = GRE_INPUT_NEXT_DROP;
+ goto drop1;
+ }
+ len = vlib_buffer_length_in_chain (vm, b1);
+ vlib_increment_combined_counter (im->combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX,
+ cpu_index,
+ tunnel_sw_if_index,
+ 1 /* packets */,
+ len /* bytes */);
+
+ vnet_buffer(b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+
+drop1:
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = tunnel_sw_if_index;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ }
+
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->tunnel_id = tunnel_sw_if_index;
+ tr->length = ip1->length;
+ tr->src.as_u32 = ip1->src_address.as_u32;
+ tr->dst.as_u32 = ip1->dst_address.as_u32;
+ }
+
+ vlib_buffer_advance (b0, sizeof (*h0));
+ vlib_buffer_advance (b1, sizeof (*h1));
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ gre_header_t * h0;
+ ip4_header_t * ip0;
+ u16 version0;
+ int verr0;
+ u32 i0, next0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+
+ vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
+ vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
+
+ vlib_buffer_advance (b0, sizeof (*ip0));
+
+ h0 = vlib_buffer_get_current (b0);
+
+ i0 = sparse_vec_index (rt->next_by_protocol, h0->protocol);
+ next0 = vec_elt(rt->next_by_protocol, i0);
+
+ b0->error =
+ node->errors[i0 == SPARSE_VEC_INVALID_INDEX
+ ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
+
+ version0 = clib_net_to_host_u16 (h0->flags_and_version);
+ verr0 = version0 & GRE_VERSION_MASK;
+ b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
+ : b0->error;
+ next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
+
+
+ /* For IP payload we need to find source interface
+ so we can increase counters and help forward node to
+ pick right FIB */
+ /* RPF check for ip4/ip6 input */
+ if (PREDICT_TRUE(next0 == GRE_INPUT_NEXT_IP4_INPUT
+ || next0 == GRE_INPUT_NEXT_IP6_INPUT
+ || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
+ || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b0)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (gm->tunnel_by_key, key);
+ if (!p)
+ {
+ next0 = GRE_INPUT_NEXT_DROP;
+ b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop;
+ }
+ t = pool_elt_at_index (gm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (gm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ }
+ else
+ {
+ next0 = GRE_INPUT_NEXT_DROP;
+ goto drop;
+ }
+ len = vlib_buffer_length_in_chain (vm, b0);
+ vlib_increment_combined_counter (im->combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX,
+ cpu_index,
+ tunnel_sw_if_index,
+ 1 /* packets */,
+ len /* bytes */);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+
+drop:
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = tunnel_sw_if_index;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ }
+
+ vlib_buffer_advance (b0, sizeof (*h0));
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ vlib_node_increment_counter (vm, gre_input_node.index,
+ GRE_ERROR_PKTS_DECAP, from_frame->n_vectors);
+ return from_frame->n_vectors;
+}
+
+static char * gre_error_strings[] = {
+#define gre_error(n,s) s,
+#include "error.def"
+#undef gre_error
+};
+
+VLIB_REGISTER_NODE (gre_input_node) = {
+ .function = gre_input,
+ .name = "gre-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .runtime_data_bytes = sizeof (gre_input_runtime_t),
+
+ .n_errors = GRE_N_ERROR,
+ .error_strings = gre_error_strings,
+
+ .n_next_nodes = GRE_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [GRE_INPUT_NEXT_##s] = n,
+ foreach_gre_input_next
+#undef _
+ },
+
+ .format_buffer = format_gre_header_with_length,
+ .format_trace = format_gre_rx_trace,
+ .unformat_buffer = unformat_gre_header,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gre_input_node, gre_input)
+
+void
+gre_register_input_protocol (vlib_main_t * vm,
+ gre_protocol_t protocol,
+ u32 node_index)
+{
+ gre_main_t * em = &gre_main;
+ gre_protocol_info_t * pi;
+ gre_input_runtime_t * rt;
+ u16 * n;
+
+ {
+ clib_error_t * error = vlib_call_init_function (vm, gre_input_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ pi = gre_get_protocol_info (em, protocol);
+ pi->node_index = node_index;
+ pi->next_index = vlib_node_add_next (vm,
+ gre_input_node.index,
+ node_index);
+
+ /* Setup gre protocol -> next index sparse vector mapping. */
+ rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
+ n = sparse_vec_validate (rt->next_by_protocol,
+ clib_host_to_net_u16 (protocol));
+ n[0] = pi->next_index;
+}
+
+static void
+gre_setup_node (vlib_main_t * vm, u32 node_index)
+{
+ vlib_node_t * n = vlib_get_node (vm, node_index);
+ pg_node_t * pn = pg_get_node (node_index);
+
+ n->format_buffer = format_gre_header_with_length;
+ n->unformat_buffer = unformat_gre_header;
+ pn->unformat_edit = unformat_pg_gre_header;
+}
+
+static clib_error_t * gre_input_init (vlib_main_t * vm)
+{
+ gre_input_runtime_t * rt;
+ vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
+
+ {
+ clib_error_t * error;
+ error = vlib_call_init_function (vm, gre_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ gre_setup_node (vm, gre_input_node.index);
+
+ rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
+
+ rt->next_by_protocol = sparse_vec_new
+ (/* elt bytes */ sizeof (rt->next_by_protocol[0]),
+ /* bits in index */ BITS (((gre_header_t *) 0)->protocol));
+
+ /* These could be moved to the supported protocol input node defn's */
+ ethernet_input = vlib_get_node_by_name (vm, (u8 *)"ethernet-input");
+ ASSERT(ethernet_input);
+ ip4_input = vlib_get_node_by_name (vm, (u8 *)"ip4-input");
+ ASSERT(ip4_input);
+ ip6_input = vlib_get_node_by_name (vm, (u8 *)"ip6-input");
+ ASSERT(ip6_input);
+ mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *)"mpls-input");
+ ASSERT(mpls_unicast_input);
+
+ gre_register_input_protocol (vm, GRE_PROTOCOL_teb,
+ ethernet_input->index);
+
+ gre_register_input_protocol (vm, GRE_PROTOCOL_ip4,
+ ip4_input->index);
+
+ gre_register_input_protocol (vm, GRE_PROTOCOL_ip6,
+ ip6_input->index);
+
+ gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
+ mpls_unicast_input->index);
+
+ ip4_register_protocol (IP_PROTOCOL_GRE, gre_input_node.index);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (gre_input_init);
diff --git a/src/vnet/gre/packet.h b/src/vnet/gre/packet.h
new file mode 100644
index 00000000..cc2ccda9
--- /dev/null
+++ b/src/vnet/gre/packet.h
@@ -0,0 +1,55 @@
+#ifndef included_vnet_gre_packet_h
+#define included_vnet_gre_packet_h
+
+/*
+ * GRE packet format
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define foreach_gre_protocol \
+_ (0x0800, ip4) \
+_ (0x86DD, ip6) \
+_ (0x6558, teb) \
+_ (0x0806, arp) \
+_ (0x8847, mpls_unicast) \
+_ (0x894F, nsh)
+
+typedef enum {
+#define _(n,f) GRE_PROTOCOL_##f = n,
+ foreach_gre_protocol
+#undef _
+} gre_protocol_t;
+
+typedef struct {
+ /* flags and version */
+ u16 flags_and_version;
+ /* unimplemented at the moment */
+#define GRE_FLAGS_CHECKSUM (1 << 15)
+
+ /* deprecated, according to rfc2784 */
+#define GRE_FLAGS_ROUTING (1 << 14)
+#define GRE_FLAGS_KEY (1 << 13)
+#define GRE_FLAGS_SEQUENCE (1 << 12)
+#define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11)
+
+ /* version 1 is PPTP which we don't support */
+#define GRE_SUPPORTED_VERSION 0
+#define GRE_VERSION_MASK 0x7
+
+ /* 0x800 for ip4, etc. */
+ u16 protocol;
+} gre_header_t;
+
+#endif /* included_vnet_gre_packet_h */
diff --git a/src/vnet/gre/pg.c b/src/vnet/gre/pg.c
new file mode 100644
index 00000000..cc065d3b
--- /dev/null
+++ b/src/vnet/gre/pg.c
@@ -0,0 +1,77 @@
+/*
+ * hdlc_pg.c: packet generator gre interface
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <vnet/gre/gre.h>
+
+typedef struct {
+ pg_edit_t flags_and_version;
+ pg_edit_t protocol;
+} pg_gre_header_t;
+
+static inline void
+pg_gre_header_init (pg_gre_header_t * e)
+{
+ pg_edit_init (&e->flags_and_version, gre_header_t, flags_and_version);
+ pg_edit_init (&e->protocol, gre_header_t, protocol);
+}
+
+uword
+unformat_pg_gre_header (unformat_input_t * input, va_list * args)
+{
+ pg_stream_t * s = va_arg (*args, pg_stream_t *);
+ pg_gre_header_t * h;
+ u32 group_index, error;
+
+ h = pg_create_edit_group (s, sizeof (h[0]), sizeof (gre_header_t),
+ &group_index);
+ pg_gre_header_init (h);
+
+ pg_edit_set_fixed (&h->flags_and_version, 0);
+
+ error = 1;
+ if (! unformat (input, "%U",
+ unformat_pg_edit,
+ unformat_gre_protocol_net_byte_order, &h->protocol))
+ goto done;
+
+ {
+ gre_main_t * pm = &gre_main;
+ gre_protocol_info_t * pi = 0;
+ pg_node_t * pg_node = 0;
+
+ if (h->protocol.type == PG_EDIT_FIXED)
+ {
+ u16 t = *(u16 *) h->protocol.values[PG_EDIT_LO];
+ pi = gre_get_protocol_info (pm, clib_net_to_host_u16 (t));
+ if (pi && pi->node_index != ~0)
+ pg_node = pg_get_node (pi->node_index);
+ }
+
+ if (pg_node && pg_node->unformat_edit
+ && unformat_user (input, pg_node->unformat_edit, s))
+ ;
+ }
+
+ error = 0;
+ done:
+ if (error)
+ pg_free_edit_group (s);
+ return error == 0;
+}
+