--- /dev/null
+/*
+ * Copyright (c) 2015 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 <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/vxlan/vxlan.h>
+
+/* Statistics (not all errors) */
+#define foreach_vxlan_encap_error \
+_(ENCAPSULATED, "good packets encapsulated") \
+_(DEL_TUNNEL, "deleted tunnel packets")
+
+static char * vxlan_encap_error_strings[] = {
+#define _(sym,string) string,
+ foreach_vxlan_encap_error
+#undef _
+};
+
+typedef enum {
+#define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
+ foreach_vxlan_encap_error
+#undef _
+ VXLAN_ENCAP_N_ERROR,
+} vxlan_encap_error_t;
+
+typedef enum {
+ VXLAN_ENCAP_NEXT_IP4_LOOKUP,
+ VXLAN_ENCAP_NEXT_DROP,
+ VXLAN_ENCAP_N_NEXT,
+} vxlan_encap_next_t;
+
+typedef struct {
+ u32 tunnel_index;
+ u32 vni;
+} vxlan_encap_trace_t;
+
+u8 * format_vxlan_encap_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 *);
+ vxlan_encap_trace_t * t
+ = va_arg (*args, vxlan_encap_trace_t *);
+
+ s = format (s, "VXLAN-ENCAP: tunnel %d vni %d", t->tunnel_index, t->vni);
+ return s;
+}
+
+#define foreach_fixed_header_offset \
+ _(0) _(1) _(2) _(3)
+
+static uword
+vxlan_encap (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ vxlan_main_t * vxm = &vxlan_main;
+ vnet_main_t * vnm = vxm->vnet_main;
+ vnet_interface_main_t * im = &vnm->interface_main;
+ u32 pkts_encapsulated = 0;
+ u16 old_l0 = 0, old_l1 = 0;
+ u32 cpu_index = os_get_cpu_number();
+ u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+ stats_sw_if_index = node->runtime_data[0];
+ stats_n_packets = stats_n_bytes = 0;
+
+ 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;
+ u32 flow_hash0, flow_hash1;
+ u32 next0 = VXLAN_ENCAP_NEXT_IP4_LOOKUP;
+ u32 next1 = VXLAN_ENCAP_NEXT_IP4_LOOKUP;
+ u32 sw_if_index0, sw_if_index1, len0, len1;
+ vnet_hw_interface_t * hi0, * hi1;
+ ip4_header_t * ip0, * ip1;
+ udp_header_t * udp0, * udp1;
+ u64 * copy_src0, * copy_dst0;
+ u64 * copy_src1, * copy_dst1;
+ u32 * copy_src_last0, * copy_dst_last0;
+ u32 * copy_src_last1, * copy_dst_last1;
+ vxlan_tunnel_t * t0, * t1;
+ u16 new_l0, new_l1;
+ ip_csum_t sum0, sum1;
+
+ /* 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, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, 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);
+
+ flow_hash0 = vnet_l2_compute_flow_hash (b0);
+ flow_hash1 = vnet_l2_compute_flow_hash (b1);
+
+ /* 1-wide cache? */
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
+ sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
+ hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
+ hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
+
+ t0 = &vxm->tunnels[hi0->dev_instance];
+ t1 = &vxm->tunnels[hi1->dev_instance];
+
+ /* Check rewrite string and drop packet if tunnel is deleted */
+ if (PREDICT_FALSE(t0->rewrite == vxlan_dummy_rewrite))
+ {
+ next0 = VXLAN_ENCAP_NEXT_DROP;
+ b0->error = node->errors[VXLAN_ENCAP_ERROR_DEL_TUNNEL];
+ pkts_encapsulated --;
+ } /* Still go through normal encap with dummy rewrite */
+ if (PREDICT_FALSE(t1->rewrite == vxlan_dummy_rewrite))
+ {
+ next1 = VXLAN_ENCAP_NEXT_DROP;
+ b1->error = node->errors[VXLAN_ENCAP_ERROR_DEL_TUNNEL];
+ pkts_encapsulated --;
+ } /* Still go through normal encap with dummy rewrite */
+
+ /* IP4 VXLAN header sizeof(ip4_vxlan_header_t) should be 36 octects */
+ ASSERT(vec_len(t0->rewrite) == 36);
+ ASSERT(vec_len(t1->rewrite) == 36);
+
+ /* Apply the rewrite string. $$$$ vnet_rewrite? */
+ vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
+ vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
+
+ ip0 = vlib_buffer_get_current(b0);
+ ip1 = vlib_buffer_get_current(b1);
+ /* Copy the fixed header */
+ copy_dst0 = (u64 *) ip0;
+ copy_src0 = (u64 *) t0->rewrite;
+ copy_dst1 = (u64 *) ip1;
+ copy_src1 = (u64 *) t1->rewrite;
+
+ /* Copy first 32 octets 8-bytes at a time */
+#define _(offs) copy_dst0[offs] = copy_src0[offs];
+ foreach_fixed_header_offset;
+#undef _
+#define _(offs) copy_dst1[offs] = copy_src1[offs];
+ foreach_fixed_header_offset;
+#undef _
+
+ /* Last 4 octets. Hopefully gcc will be our friend */
+ copy_dst_last0 = (u32 *)(©_dst0[4]);
+ copy_src_last0 = (u32 *)(©_src0[4]);
+ copy_dst_last1 = (u32 *)(©_dst1[4]);
+ copy_src_last1 = (u32 *)(©_src1[4]);
+
+ copy_dst_last0[0] = copy_src_last0[0];
+ copy_dst_last1[0] = copy_src_last1[0];
+
+ /* fix the <bleep>ing outer-IP checksum */
+ sum0 = ip0->checksum;
+ /* old_l0 always 0, see the rewrite setup */
+ new_l0 =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+
+ sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+ length /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+ ip0->length = new_l0;
+
+ sum1 = ip1->checksum;
+ /* old_l1 always 0, see the rewrite setup */
+ new_l1 =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
+
+ sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
+ length /* changed member */);
+ ip1->checksum = ip_csum_fold (sum1);
+ ip1->length = new_l1;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *)(ip0+1);
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
+ - sizeof (*ip0));
+ udp1 = (udp_header_t *)(ip1+1);
+ new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
+ - sizeof (*ip1));
+
+ udp0->length = new_l0;
+ udp0->src_port = flow_hash0;
+
+ udp1->length = new_l1;
+ udp1->src_port = flow_hash1;
+
+ /* Reset to look up tunnel partner in the configured FIB */
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
+ pkts_encapsulated += 2;
+
+ len0 = vlib_buffer_length_in_chain (vm, b0);
+ len1 = vlib_buffer_length_in_chain (vm, b0);
+ stats_n_packets += 2;
+ stats_n_bytes += len0 + len1;
+
+ /* Batch stats increment on the same vxlan tunnel so counter is not
+ incremented per packet. Note stats are still incremented for deleted
+ and admin-down tunnel where packets are dropped. It is not worthwhile
+ to check for this rare case and affect normal path performance. */
+ if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
+ (sw_if_index0 != stats_sw_if_index)))
+ {
+ stats_n_packets -= 2;
+ stats_n_bytes -= len0 + len1;
+ if (sw_if_index0 == sw_if_index1)
+ {
+ if (stats_n_packets)
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
+ cpu_index, stats_sw_if_index,
+ stats_n_packets, stats_n_bytes);
+ stats_sw_if_index = sw_if_index0;
+ stats_n_packets = 2;
+ stats_n_bytes = len0 + len1;
+ }
+ else
+ {
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
+ cpu_index, sw_if_index0, 1, len0);
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
+ cpu_index, sw_if_index1, 1, len1);
+ }
+ }
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->tunnel_index = t0 - vxm->tunnels;
+ tr->vni = t0->vni;
+ }
+
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->tunnel_index = t1 - vxm->tunnels;
+ tr->vni = t1->vni;
+ }
+
+ 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;
+ u32 flow_hash0;
+ u32 next0 = VXLAN_ENCAP_NEXT_IP4_LOOKUP;
+ u32 sw_if_index0, len0;
+ vnet_hw_interface_t * hi0;
+ ip4_header_t * ip0;
+ udp_header_t * udp0;
+ u64 * copy_src0, * copy_dst0;
+ u32 * copy_src_last0, * copy_dst_last0;
+ vxlan_tunnel_t * t0;
+ u16 new_l0;
+ ip_csum_t sum0;
+
+ 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);
+
+ flow_hash0 = vnet_l2_compute_flow_hash(b0);
+
+ /* 1-wide cache? */
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
+ hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
+
+ t0 = &vxm->tunnels[hi0->dev_instance];
+
+ /* Check rewrite string and drop packet if tunnel is deleted */
+ if (PREDICT_FALSE(t0->rewrite == vxlan_dummy_rewrite))
+ {
+ next0 = VXLAN_ENCAP_NEXT_DROP;
+ b0->error = node->errors[VXLAN_ENCAP_ERROR_DEL_TUNNEL];
+ pkts_encapsulated --;
+ } /* Still go through normal encap with dummy rewrite */
+
+ /* IP4 VXLAN header sizeof(ip4_vxlan_header_t) should be 36 octects */
+ ASSERT(vec_len(t0->rewrite) == 36);
+
+ /* Apply the rewrite string. $$$$ vnet_rewrite? */
+ vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
+
+ ip0 = vlib_buffer_get_current(b0);
+ /* Copy the fixed header */
+ copy_dst0 = (u64 *) ip0;
+ copy_src0 = (u64 *) t0->rewrite;
+
+ /* Copy first 32 octets 8-bytes at a time */
+#define _(offs) copy_dst0[offs] = copy_src0[offs];
+ foreach_fixed_header_offset;
+#undef _
+ /* Last 4 octets. Hopefully gcc will be our friend */
+ copy_dst_last0 = (u32 *)(©_dst0[4]);
+ copy_src_last0 = (u32 *)(©_src0[4]);
+
+ copy_dst_last0[0] = copy_src_last0[0];
+
+ /* fix the <bleep>ing outer-IP checksum */
+ sum0 = ip0->checksum;
+ /* old_l0 always 0, see the rewrite setup */
+ new_l0 =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+
+ sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+ length /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+ ip0->length = new_l0;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *)(ip0+1);
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
+ - sizeof (*ip0));
+
+ udp0->length = new_l0;
+ udp0->src_port = flow_hash0;
+
+ /* Reset to look up tunnel partner in the configured FIB */
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
+ pkts_encapsulated ++;
+
+ len0 = vlib_buffer_length_in_chain (vm, b0);
+ stats_n_packets += 1;
+ stats_n_bytes += len0;
+
+ /* Batch stats increment on the same vxlan tunnel so counter is not
+ incremented per packet. Note stats are still incremented for deleted
+ and admin-down tunnel where packets are dropped. It is not worthwhile
+ to check for this rare case and affect normal path performance. */
+ if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
+ {
+ stats_n_packets -= 1;
+ stats_n_bytes -= len0;
+ if (stats_n_packets)
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
+ cpu_index, stats_sw_if_index,
+ stats_n_packets, stats_n_bytes);
+ stats_n_packets = 1;
+ stats_n_bytes = len0;
+ stats_sw_if_index = sw_if_index0;
+ }
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->tunnel_index = t0 - vxm->tunnels;
+ tr->vni = t0->vni;
+ }
+ 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);
+ }
+
+ /* Do we still need this now that tunnel tx stats is kept? */
+ vlib_node_increment_counter (vm, node->node_index,
+ VXLAN_ENCAP_ERROR_ENCAPSULATED,
+ pkts_encapsulated);
+
+ /* Increment any remaining batch stats */
+ if (stats_n_packets)
+ {
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
+ cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
+ node->runtime_data[0] = stats_sw_if_index;
+ }
+
+ return from_frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (vxlan_encap_node) = {
+ .function = vxlan_encap,
+ .name = "vxlan-encap",
+ .vector_size = sizeof (u32),
+ .format_trace = format_vxlan_encap_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
+ .error_strings = vxlan_encap_error_strings,
+
+ .n_next_nodes = VXLAN_ENCAP_N_NEXT,
+
+ .next_nodes = {
+ [VXLAN_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
+ [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
+ },
+};
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