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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/gre.c
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/gre.c')
-rw-r--r--src/vnet/gre/gre.c455
1 files changed, 455 insertions, 0 deletions
diff --git a/src/vnet/gre/gre.c b/src/vnet/gre/gre.c
new file mode 100644
index 00000000000..0faed13eb29
--- /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;
+}
+