--- /dev/null
+/*
+ * 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.
+ */
+/**
+ * @file ipsec_gre.c
+ * @brief L2-GRE over IPSec packet processing.
+ *
+ * Add GRE header to thr packet and send it to the esp-encrypt node.
+*/
+
+#include <vnet/vnet.h>
+#include <vnet/ipsec-gre/ipsec_gre.h>
+
+ipsec_gre_main_t ipsec_gre_main;
+
+/**
+ * @brief IPv4 and GRE header.
+ *
+*/
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct
+{
+ ip4_header_t ip4;
+ gre_header_t gre;
+}) ip4_and_gre_header_t;
+/* *INDENT-OFF* */
+
+/**
+ * @brief IPv4 and GRE header union.
+ *
+*/
+typedef struct
+{
+ union
+ {
+ ip4_and_gre_header_t ip4_and_gre;
+ u64 as_u64[3];
+ };
+} ip4_and_gre_union_t;
+
+/**
+ * @brief Packet trace.
+ *
+*/
+typedef struct
+{
+ u32 tunnel_id; /**< Tunnel-id / index in tunnel vector */
+
+ u32 length; /**< pkt length */
+
+ ip4_address_t src; /**< tunnel src IPv4 address */
+ ip4_address_t dst; /**< tunnel dst IPv4 address */
+
+ u32 sa_id; /**< tunnel IPSec SA id */
+} ipsec_gre_tx_trace_t;
+
+u8 *
+format_ipsec_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 *);
+ ipsec_gre_tx_trace_t *t = va_arg (*args, ipsec_gre_tx_trace_t *);
+
+ s = format (s, "GRE: tunnel %d len %d src %U dst %U sa-id %d",
+ t->tunnel_id, clib_net_to_host_u16 (t->length),
+ format_ip4_address, &t->src.as_u8,
+ format_ip4_address, &t->dst.as_u8, t->sa_id);
+ return s;
+}
+
+/**
+ * @brief IPSec-GRE tunnel interface tx function.
+ *
+ * Add GRE header to the packet.
+ *
+ * @param vm vlib_main_t corresponding to the current thread.
+ * @param node vlib_node_runtime_t data for this node.
+ * @param frame vlib_frame_t whose contents should be dispatched.
+ *
+ * @par Graph mechanics: buffer metadata, next index usage
+ *
+ * <em>Uses:</em>
+ * - <code>node->runtime_data</code>
+ * - Match tunnel by <code>rd->dev_instance</code> in IPSec-GRE tunnels
+ * pool.
+ *
+ * <em>Sets:</em>
+ * - <code>vnet_buffer(b)->output_features.ipsec_sad_index</code>
+ * - Set IPSec Security Association for packet encryption.
+ * - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
+ * - Reset output sw_if_index.
+ *
+ * <em>Nexd Index:</em>
+ * - Dispatches the packet to the esp-encrypt node.
+*/
+static uword
+ipsec_gre_interface_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ ipsec_gre_main_t *igm = &ipsec_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;
+ ipsec_gre_tunnel_t *t = pool_elt_at_index (igm->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);
+
+ /*
+ * As long as we have enough pkts left to process two pkts
+ * and prefetch two pkts...
+ */
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ vlib_buffer_t *b0, *b1;
+ ip4_header_t *ip0, *ip1;
+ ip4_and_gre_union_t *h0, *h1;
+ u32 bi0, next0, bi1, next1;
+ __attribute__ ((unused)) u8 error0, error1;
+ u16 gre_protocol0, gre_protocol1;
+
+ /* Prefetch the 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);
+
+ /*
+ * Prefetch packet data. We expect to overwrite
+ * the inbound L2 header with an ip header and a
+ * gre header. Might want to prefetch the last line
+ * of rewrite space as well; need profile data
+ */
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ /* Pick up the next two buffer indices */
+ bi0 = from[0];
+ bi1 = from[1];
+
+ /* Speculatively enqueue them where we sent the last buffer */
+ 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);
+
+ ip0 = vlib_buffer_get_current (b0);
+ gre_protocol0 = clib_net_to_host_u16 (0x01);
+
+ ip1 = vlib_buffer_get_current (b1);
+ gre_protocol1 = clib_net_to_host_u16 (0x01);
+
+ vlib_buffer_advance (b0, -sizeof (*h0));
+ vlib_buffer_advance (b1, -sizeof (*h1));
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+ h0->as_u64[0] = 0;
+ h0->as_u64[1] = 0;
+ h0->as_u64[2] = 0;
+
+ h1->as_u64[0] = 0;
+ h1->as_u64[1] = 0;
+ h1->as_u64[2] = 0;
+
+ ip0 = &h0->ip4_and_gre.ip4;
+ h0->ip4_and_gre.gre.protocol = gre_protocol0;
+ ip0->ip_version_and_header_length = 0x45;
+ ip0->ttl = 254;
+ ip0->protocol = IP_PROTOCOL_GRE;
+
+ ip1 = &h1->ip4_and_gre.ip4;
+ h1->ip4_and_gre.gre.protocol = gre_protocol1;
+ ip1->ip_version_and_header_length = 0x45;
+ ip1->ttl = 254;
+ ip1->protocol = IP_PROTOCOL_GRE;
+
+ ip0->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+ ip1->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
+ ip0->src_address.as_u32 = t->tunnel_src.as_u32;
+ ip1->src_address.as_u32 = t->tunnel_src.as_u32;
+ ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
+ ip1->dst_address.as_u32 = t->tunnel_dst.as_u32;
+ ip0->checksum = ip4_header_checksum (ip0);
+ ip1->checksum = ip4_header_checksum (ip1);
+
+ vnet_buffer (b0)->output_features.ipsec_sad_index = t->local_sa;
+ vnet_buffer (b1)->output_features.ipsec_sad_index = t->local_sa;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
+ next1 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
+ error0 = IPSEC_GRE_ERROR_NONE;
+ error1 = IPSEC_GRE_ERROR_NONE;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = t - igm->tunnels;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ tr->sa_id = t->local_sa_id;
+ }
+
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->tunnel_id = t - igm->tunnels;
+ tr->length = ip1->length;
+ tr->src.as_u32 = ip1->src_address.as_u32;
+ tr->dst.as_u32 = ip1->dst_address.as_u32;
+ tr->sa_id = t->local_sa_id;
+ }
+
+ 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)
+ {
+ vlib_buffer_t *b0;
+ ip4_header_t *ip0;
+ ip4_and_gre_union_t *h0;
+ u32 bi0, next0;
+ __attribute__ ((unused)) u8 error0;
+ u16 gre_protocol0;
+
+ bi0 = to_next[0] = from[0];
+ from += 1;
+ n_left_from -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ gre_protocol0 = clib_net_to_host_u16 (0x01);
+
+ vlib_buffer_advance (b0, -sizeof (*h0));
+
+ h0 = vlib_buffer_get_current (b0);
+ h0->as_u64[0] = 0;
+ h0->as_u64[1] = 0;
+ h0->as_u64[2] = 0;
+
+ ip0 = &h0->ip4_and_gre.ip4;
+ h0->ip4_and_gre.gre.protocol = gre_protocol0;
+ ip0->ip_version_and_header_length = 0x45;
+ ip0->ttl = 254;
+ ip0->protocol = IP_PROTOCOL_GRE;
+ ip0->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+ ip0->src_address.as_u32 = t->tunnel_src.as_u32;
+ ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
+ ip0->checksum = ip4_header_checksum (ip0);
+
+ vnet_buffer (b0)->output_features.ipsec_sad_index = t->local_sa;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
+ error0 = IPSEC_GRE_ERROR_NONE;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = t - igm->tunnels;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ tr->sa_id = t->local_sa_id;
+ }
+
+ 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, ipsec_gre_input_node.index,
+ IPSEC_GRE_ERROR_PKTS_ENCAP, frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+static clib_error_t *
+ipsec_gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
+ u32 flags)
+{
+ 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 */ );
+
+ return /* no error */ 0;
+}
+
+static u8 *
+format_ipsec_gre_tunnel_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "ipsec-gre%d", dev_instance);
+}
+
+static u8 *
+format_ipsec_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, "IPSEC-GRE tunnel: id %d\n", dev_instance);
+ return s;
+}
+
+/* *INDENT-OFF* */
+VNET_DEVICE_CLASS (ipsec_gre_device_class) = {
+ .name = "IPSec GRE tunnel device",
+ .format_device_name = format_ipsec_gre_tunnel_name,
+ .format_device = format_ipsec_gre_device,
+ .format_tx_trace = format_ipsec_gre_tx_trace,
+ .tx_function = ipsec_gre_interface_tx,
+ .admin_up_down_function = ipsec_gre_interface_admin_up_down,
+};
+
+VLIB_DEVICE_TX_FUNCTION_MULTIARCH (ipsec_gre_device_class,
+ ipsec_gre_interface_tx)
+
+
+VNET_HW_INTERFACE_CLASS (ipsec_gre_hw_interface_class) = {
+ .name = "IPSEC-GRE",
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+ipsec_gre_init (vlib_main_t * vm)
+{
+ ipsec_gre_main_t *igm = &ipsec_gre_main;
+ clib_error_t *error;
+
+ memset (igm, 0, sizeof (igm[0]));
+ igm->vlib_main = vm;
+ igm->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;
+
+ igm->tunnel_by_key = hash_create (0, sizeof (uword));
+
+ return vlib_call_init_function (vm, ipsec_gre_input_init);
+}
+
+VLIB_INIT_FUNCTION (ipsec_gre_init);
+
+ipsec_gre_main_t *
+ipsec_gre_get_main (vlib_main_t * vm)
+{
+ vlib_call_init_function (vm, ipsec_gre_init);
+ return &ipsec_gre_main;
+}
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/
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