--- /dev/null
+/*
+ * decap.c: vxlan gbp tunnel decap packet processing
+ *
+ * Copyright (c) 2018 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/vxlan-gbp/vxlan_gbp.h>
+
+typedef struct
+{
+ u32 next_index;
+ u32 tunnel_index;
+ u32 error;
+ u32 vni;
+ u16 sclass;
+ u8 flags;
+} vxlan_gbp_rx_trace_t;
+
+static u8 *
+format_vxlan_gbp_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 *);
+ vxlan_gbp_rx_trace_t *t = va_arg (*args, vxlan_gbp_rx_trace_t *);
+
+ if (t->tunnel_index == ~0)
+ return format (s,
+ "VXLAN_GBP decap error - tunnel for vni %d does not exist",
+ t->vni);
+ return format (s,
+ "VXLAN_GBP decap from vxlan_gbp_tunnel%d vni %d sclass %d"
+ " flags %U next %d error %d",
+ t->tunnel_index, t->vni, t->sclass,
+ format_vxlan_gbp_header_gpflags, t->flags,
+ t->next_index, t->error);
+}
+
+always_inline u32
+buf_fib_index (vlib_buffer_t * b, u32 is_ip4)
+{
+ u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
+ if (sw_if_index != (u32) ~ 0)
+ return sw_if_index;
+
+ u32 *fib_index_by_sw_if_index = is_ip4 ?
+ ip4_main.fib_index_by_sw_if_index : ip6_main.fib_index_by_sw_if_index;
+ sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+
+ return vec_elt (fib_index_by_sw_if_index, sw_if_index);
+}
+
+typedef vxlan4_gbp_tunnel_key_t last_tunnel_cache4;
+
+always_inline vxlan_gbp_tunnel_t *
+vxlan4_gbp_find_tunnel (vxlan_gbp_main_t * vxm, last_tunnel_cache4 * cache,
+ u32 fib_index, ip4_header_t * ip4_0,
+ vxlan_gbp_header_t * vxlan_gbp0)
+{
+ /*
+ * Check unicast first since that's where most of the traffic comes from
+ * Make sure VXLAN_GBP tunnel exist according to packet SIP, DIP and VNI
+ */
+ vxlan4_gbp_tunnel_key_t key4;
+ int rv;
+
+ key4.key[1] = (((u64) fib_index << 32) |
+ (vxlan_gbp0->vni_reserved &
+ clib_host_to_net_u32 (0xffffff00)));
+ key4.key[0] =
+ (((u64) ip4_0->dst_address.as_u32 << 32) | ip4_0->src_address.as_u32);
+
+ if (PREDICT_FALSE (key4.key[0] != cache->key[0] ||
+ key4.key[1] != cache->key[1]))
+ {
+ rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_gbp_tunnel_by_key,
+ &key4);
+ if (PREDICT_FALSE (rv == 0))
+ {
+ *cache = key4;
+ return (pool_elt_at_index (vxm->tunnels, cache->value));
+ }
+ }
+ else
+ {
+ return (pool_elt_at_index (vxm->tunnels, cache->value));
+ }
+
+ /* No unicast match - try multicast */
+ if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address)))
+ return (NULL);
+
+ key4.key[0] = ip4_0->dst_address.as_u32;
+ /* Make sure mcast VXLAN_GBP tunnel exist by packet DIP and VNI */
+ rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_gbp_tunnel_by_key, &key4);
+
+ if (PREDICT_FALSE (rv != 0))
+ return (NULL);
+
+ return (pool_elt_at_index (vxm->tunnels, key4.value));
+}
+
+typedef vxlan6_gbp_tunnel_key_t last_tunnel_cache6;
+
+always_inline vxlan_gbp_tunnel_t *
+vxlan6_gbp_find_tunnel (vxlan_gbp_main_t * vxm, last_tunnel_cache6 * cache,
+ u32 fib_index, ip6_header_t * ip6_0,
+ vxlan_gbp_header_t * vxlan_gbp0)
+{
+ /* Make sure VXLAN_GBP tunnel exist according to packet SIP and VNI */
+ vxlan6_gbp_tunnel_key_t key6 = {
+ .key = {
+ [0] = ip6_0->src_address.as_u64[0],
+ [1] = ip6_0->src_address.as_u64[1],
+ [2] = ((((u64) fib_index) << 32) |
+ (vxlan_gbp0->vni_reserved &
+ clib_host_to_net_u32 (0xffffff00))),
+ }
+ };
+ int rv;
+
+ if (PREDICT_FALSE
+ (clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0))
+ {
+ rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_gbp_tunnel_by_key,
+ &key6);
+ if (PREDICT_FALSE (rv != 0))
+ return NULL;
+
+ *cache = key6;
+ }
+ vxlan_gbp_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value);
+
+ /* Validate VXLAN_GBP tunnel SIP against packet DIP */
+ if (PREDICT_FALSE
+ (!ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6)))
+ {
+ /* try multicast */
+ if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address)))
+ return 0;
+
+ /* Make sure mcast VXLAN_GBP tunnel exist by packet DIP and VNI */
+ key6.key[0] = ip6_0->dst_address.as_u64[0];
+ key6.key[1] = ip6_0->dst_address.as_u64[1];
+ rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_gbp_tunnel_by_key,
+ &key6);
+ if (PREDICT_FALSE (rv != 0))
+ return 0;
+
+ }
+
+ return t0;
+}
+
+always_inline vxlan_gbp_input_next_t
+vxlan_gbp_tunnel_get_next (const vxlan_gbp_tunnel_t * t, vlib_buffer_t * b0)
+{
+ if (VXLAN_GBP_TUNNEL_MODE_L2 == t->mode)
+ return (VXLAN_GBP_INPUT_NEXT_L2_INPUT);
+ else
+ {
+ ethernet_header_t *e0;
+ u16 type0;
+
+ e0 = vlib_buffer_get_current (b0);
+ vlib_buffer_advance (b0, sizeof (*e0));
+ type0 = clib_net_to_host_u16 (e0->type);
+ switch (type0)
+ {
+ case ETHERNET_TYPE_IP4:
+ return (VXLAN_GBP_INPUT_NEXT_IP4_INPUT);
+ case ETHERNET_TYPE_IP6:
+ return (VXLAN_GBP_INPUT_NEXT_IP6_INPUT);
+ }
+ }
+ return (VXLAN_GBP_INPUT_NEXT_DROP);
+}
+
+always_inline uword
+vxlan_gbp_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, u8 is_ip4)
+{
+ vxlan_gbp_main_t *vxm = &vxlan_gbp_main;
+ vnet_main_t *vnm = vxm->vnet_main;
+ vnet_interface_main_t *im = &vnm->interface_main;
+ vlib_combined_counter_main_t *rx_counter =
+ im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
+ vlib_combined_counter_main_t *drop_counter =
+ im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
+ last_tunnel_cache4 last4;
+ last_tunnel_cache6 last6;
+ u32 pkts_decapsulated = 0;
+ u32 thread_index = vlib_get_thread_index ();
+
+ if (is_ip4)
+ clib_memset (&last4, 0xff, sizeof last4);
+ else
+ clib_memset (&last6, 0xff, sizeof last6);
+
+ u32 next_index = node->cached_next_index;
+
+ u32 *from = vlib_frame_vector_args (from_frame);
+ u32 n_left_from = from_frame->n_vectors;
+
+ while (n_left_from > 0)
+ {
+ u32 *to_next, 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)
+ {
+ /* 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);
+ }
+
+ u32 bi0 = to_next[0] = from[0];
+ u32 bi1 = to_next[1] = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ vlib_buffer_t *b0, *b1;
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /* udp leaves current_data pointing at the vxlan_gbp header */
+ void *cur0 = vlib_buffer_get_current (b0);
+ void *cur1 = vlib_buffer_get_current (b1);
+ vxlan_gbp_header_t *vxlan_gbp0 = cur0;
+ vxlan_gbp_header_t *vxlan_gbp1 = cur1;
+
+ ip4_header_t *ip4_0, *ip4_1;
+ ip6_header_t *ip6_0, *ip6_1;
+ if (is_ip4)
+ {
+ ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
+ ip4_1 = cur1 - sizeof (udp_header_t) - sizeof (ip4_header_t);
+ }
+ else
+ {
+ ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
+ ip6_1 = cur1 - sizeof (udp_header_t) - sizeof (ip6_header_t);
+ }
+
+ u32 fi0 = buf_fib_index (b0, is_ip4);
+ u32 fi1 = buf_fib_index (b1, is_ip4);
+
+ vxlan_gbp_tunnel_t *t0, *t1;
+ if (is_ip4)
+ {
+ t0 =
+ vxlan4_gbp_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan_gbp0);
+ t1 =
+ vxlan4_gbp_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan_gbp1);
+ }
+ else
+ {
+ t0 =
+ vxlan6_gbp_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan_gbp0);
+ t1 =
+ vxlan6_gbp_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan_gbp1);
+ }
+
+ u32 len0 = vlib_buffer_length_in_chain (vm, b0);
+ u32 len1 = vlib_buffer_length_in_chain (vm, b1);
+
+ vxlan_gbp_input_next_t next0, next1;
+ u8 error0 = 0, error1 = 0;
+ u8 flags0 = vxlan_gbp_get_flags (vxlan_gbp0);
+ u8 flags1 = vxlan_gbp_get_flags (vxlan_gbp1);
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ /* pop vxlan_gbp */
+ vlib_buffer_advance (b0, sizeof *vxlan_gbp0);
+ vlib_buffer_advance (b1, sizeof *vxlan_gbp1);
+
+ u8 i_and_g0 = ((flags0 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
+ u8 i_and_g1 = ((flags1 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
+
+ /* Validate VXLAN_GBP tunnel encap-fib index against packet */
+ if (PREDICT_FALSE (t0 == NULL || !i_and_g0))
+ {
+ if (t0 != NULL && !i_and_g0)
+ {
+ error0 = VXLAN_GBP_ERROR_BAD_FLAGS;
+ vlib_increment_combined_counter
+ (drop_counter, thread_index, t0->sw_if_index, 1, len0);
+ next0 = VXLAN_GBP_INPUT_NEXT_DROP;
+ }
+ else
+ {
+ error0 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
+ next0 = VXLAN_GBP_INPUT_NEXT_PUNT;
+ if (is_ip4)
+ b0->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
+ else
+ b0->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
+ }
+ b0->error = node->errors[error0];
+ }
+ else
+ {
+ next0 = vxlan_gbp_tunnel_get_next (t0, b0);
+
+ /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
+ vlib_increment_combined_counter
+ (rx_counter, thread_index, t0->sw_if_index, 1, len0);
+ pkts_decapsulated++;
+ }
+
+ vnet_buffer2 (b0)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp0) |
+ VXLAN_GBP_GPFLAGS_R);
+ vnet_buffer2 (b0)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
+
+
+ if (PREDICT_FALSE (t1 == NULL || !i_and_g1))
+ {
+ if (t1 != NULL && !i_and_g1)
+ {
+ error1 = VXLAN_GBP_ERROR_BAD_FLAGS;
+ vlib_increment_combined_counter
+ (drop_counter, thread_index, t1->sw_if_index, 1, len1);
+ next1 = VXLAN_GBP_INPUT_NEXT_DROP;
+ }
+ else
+ {
+ error1 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
+ next1 = VXLAN_GBP_INPUT_NEXT_PUNT;
+ if (is_ip4)
+ b1->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
+ else
+ b1->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
+ }
+ b1->error = node->errors[error1];
+ }
+ else
+ {
+ next1 = vxlan_gbp_tunnel_get_next (t1, b1);
+
+ /* Set packet input sw_if_index to unicast VXLAN_GBP tunnel for learning */
+ vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;
+ pkts_decapsulated++;
+
+ vlib_increment_combined_counter
+ (rx_counter, thread_index, t1->sw_if_index, 1, len1);
+ }
+
+ vnet_buffer2 (b1)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp1) |
+ VXLAN_GBP_GPFLAGS_R);
+
+ vnet_buffer2 (b1)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp1);
+
+ vnet_update_l2_len (b0);
+ vnet_update_l2_len (b1);
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_rx_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
+ tr->vni = vxlan_gbp_get_vni (vxlan_gbp0);
+ tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
+ tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp0);
+ }
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_rx_trace_t *tr =
+ vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->next_index = next1;
+ tr->error = error1;
+ tr->tunnel_index = t1 == 0 ? ~0 : t1 - vxm->tunnels;
+ tr->vni = vxlan_gbp_get_vni (vxlan_gbp1);
+ tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp1);
+ tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp1);
+ }
+
+ 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 = to_next[0] = from[0];
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
+
+ /* udp leaves current_data pointing at the vxlan_gbp header */
+ void *cur0 = vlib_buffer_get_current (b0);
+ vxlan_gbp_header_t *vxlan_gbp0 = cur0;
+ ip4_header_t *ip4_0;
+ ip6_header_t *ip6_0;
+ if (is_ip4)
+ ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
+ else
+ ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
+
+ u32 fi0 = buf_fib_index (b0, is_ip4);
+
+ vxlan_gbp_tunnel_t *t0;
+ if (is_ip4)
+ t0 = vxlan4_gbp_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan_gbp0);
+ else
+ t0 = vxlan6_gbp_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan_gbp0);
+
+ uword len0 = vlib_buffer_length_in_chain (vm, b0);
+
+ vxlan_gbp_input_next_t next0;
+ u8 error0 = 0;
+ u8 flags0 = vxlan_gbp_get_flags (vxlan_gbp0);
+
+ /* pop (ip, udp, vxlan_gbp) */
+ vlib_buffer_advance (b0, sizeof (*vxlan_gbp0));
+
+ u8 i_and_g0 = ((flags0 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
+
+ /* Validate VXLAN_GBP tunnel encap-fib index against packet */
+ if (PREDICT_FALSE (t0 == NULL || !i_and_g0))
+ {
+ if (t0 != NULL && !i_and_g0)
+ {
+ error0 = VXLAN_GBP_ERROR_BAD_FLAGS;
+ vlib_increment_combined_counter
+ (drop_counter, thread_index, t0->sw_if_index, 1, len0);
+ next0 = VXLAN_GBP_INPUT_NEXT_DROP;
+ }
+ else
+ {
+ error0 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
+ next0 = VXLAN_GBP_INPUT_NEXT_PUNT;
+ if (is_ip4)
+ b0->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
+ else
+ b0->punt_reason =
+ vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
+ }
+ b0->error = node->errors[error0];
+ }
+ else
+ {
+ next0 = vxlan_gbp_tunnel_get_next (t0, b0);
+ /* Set packet input sw_if_index to unicast VXLAN_GBP tunnel for learning */
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
+ pkts_decapsulated++;
+
+ vlib_increment_combined_counter
+ (rx_counter, thread_index, t0->sw_if_index, 1, len0);
+ }
+ vnet_buffer2 (b0)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp0) |
+ VXLAN_GBP_GPFLAGS_R);
+
+ vnet_buffer2 (b0)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ vnet_update_l2_len (b0);
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_rx_trace_t *tr
+ = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
+ tr->vni = vxlan_gbp_get_vni (vxlan_gbp0);
+ tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
+ tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp0);
+ }
+ 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? */
+ u32 node_idx =
+ is_ip4 ? vxlan4_gbp_input_node.index : vxlan6_gbp_input_node.index;
+ vlib_node_increment_counter (vm, node_idx, VXLAN_GBP_ERROR_DECAPSULATED,
+ pkts_decapsulated);
+
+ return from_frame->n_vectors;
+}
+
+VLIB_NODE_FN (vxlan4_gbp_input_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return vxlan_gbp_input (vm, node, from_frame, /* is_ip4 */ 1);
+}
+
+VLIB_NODE_FN (vxlan6_gbp_input_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return vxlan_gbp_input (vm, node, from_frame, /* is_ip4 */ 0);
+}
+
+static char *vxlan_gbp_error_strings[] = {
+#define vxlan_gbp_error(n,s) s,
+#include <vnet/vxlan-gbp/vxlan_gbp_error.def>
+#undef vxlan_gbp_error
+#undef _
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (vxlan4_gbp_input_node) =
+{
+ .name = "vxlan4-gbp-input",
+ .vector_size = sizeof (u32),
+ .n_errors = VXLAN_GBP_N_ERROR,
+ .error_strings = vxlan_gbp_error_strings,
+ .n_next_nodes = VXLAN_GBP_INPUT_N_NEXT,
+ .format_trace = format_vxlan_gbp_rx_trace,
+ .next_nodes = {
+#define _(s,n) [VXLAN_GBP_INPUT_NEXT_##s] = n,
+ foreach_vxlan_gbp_input_next
+#undef _
+ },
+};
+
+VLIB_REGISTER_NODE (vxlan6_gbp_input_node) =
+{
+ .name = "vxlan6-gbp-input",
+ .vector_size = sizeof (u32),
+ .n_errors = VXLAN_GBP_N_ERROR,
+ .error_strings = vxlan_gbp_error_strings,
+ .n_next_nodes = VXLAN_GBP_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [VXLAN_GBP_INPUT_NEXT_##s] = n,
+ foreach_vxlan_gbp_input_next
+#undef _
+ },
+ .format_trace = format_vxlan_gbp_rx_trace,
+};
+/* *INDENT-ON* */
+
+typedef enum
+{
+ IP_VXLAN_GBP_BYPASS_NEXT_DROP,
+ IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP,
+ IP_VXLAN_GBP_BYPASS_N_NEXT,
+} ip_vxlan_gbp_bypass_next_t;
+
+always_inline uword
+ip_vxlan_gbp_bypass_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, u32 is_ip4)
+{
+ vxlan_gbp_main_t *vxm = &vxlan_gbp_main;
+ u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
+ vlib_node_runtime_t *error_node =
+ vlib_node_get_runtime (vm, ip4_input_node.index);
+ ip4_address_t addr4; /* last IPv4 address matching a local VTEP address */
+ ip6_address_t addr6; /* last IPv6 address matching a local VTEP address */
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ ip4_forward_next_trace (vm, node, frame, VLIB_TX);
+
+ if (is_ip4)
+ addr4.data_u32 = ~0;
+ else
+ ip6_address_set_zero (&addr6);
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ vlib_buffer_t *b0, *b1;
+ ip4_header_t *ip40, *ip41;
+ ip6_header_t *ip60, *ip61;
+ udp_header_t *udp0, *udp1;
+ u32 bi0, ip_len0, udp_len0, flags0, next0;
+ u32 bi1, ip_len1, udp_len1, flags1, next1;
+ i32 len_diff0, len_diff1;
+ u8 error0, good_udp0, proto0;
+ u8 error1, good_udp1, proto1;
+
+ /* 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 = to_next[0] = from[0];
+ bi1 = to_next[1] = from[1];
+ from += 2;
+ n_left_from -= 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+ if (is_ip4)
+ {
+ ip40 = vlib_buffer_get_current (b0);
+ ip41 = vlib_buffer_get_current (b1);
+ }
+ else
+ {
+ ip60 = vlib_buffer_get_current (b0);
+ ip61 = vlib_buffer_get_current (b1);
+ }
+
+ /* Setup packet for next IP feature */
+ vnet_feature_next (&next0, b0);
+ vnet_feature_next (&next1, b1);
+
+ if (is_ip4)
+ {
+ /* Treat IP frag packets as "experimental" protocol for now
+ until support of IP frag reassembly is implemented */
+ proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
+ proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
+ }
+ else
+ {
+ proto0 = ip60->protocol;
+ proto1 = ip61->protocol;
+ }
+
+ /* Process packet 0 */
+ if (proto0 != IP_PROTOCOL_UDP)
+ goto exit0; /* not UDP packet */
+
+ if (is_ip4)
+ udp0 = ip4_next_header (ip40);
+ else
+ udp0 = ip6_next_header (ip60);
+
+ if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
+ goto exit0; /* not VXLAN_GBP packet */
+
+ /* Validate DIP against VTEPs */
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip40->dst_address.as_u32)
+ {
+ if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
+ goto exit0; /* no local VTEP for VXLAN_GBP packet */
+ addr4 = ip40->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
+ {
+ if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
+ goto exit0; /* no local VTEP for VXLAN_GBP packet */
+ addr6 = ip60->dst_address;
+ }
+ }
+
+ flags0 = b0->flags;
+ good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+
+ /* Don't verify UDP checksum for packets with explicit zero checksum. */
+ good_udp0 |= udp0->checksum == 0;
+
+ /* Verify UDP length */
+ if (is_ip4)
+ ip_len0 = clib_net_to_host_u16 (ip40->length);
+ else
+ ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
+ udp_len0 = clib_net_to_host_u16 (udp0->length);
+ len_diff0 = ip_len0 - udp_len0;
+
+ /* Verify UDP checksum */
+ if (PREDICT_FALSE (!good_udp0))
+ {
+ if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
+ {
+ if (is_ip4)
+ flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
+ else
+ flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
+ good_udp0 =
+ (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+ }
+ }
+
+ if (is_ip4)
+ {
+ error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
+ error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
+ }
+ else
+ {
+ error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
+ error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
+ }
+
+ next0 = error0 ?
+ IP_VXLAN_GBP_BYPASS_NEXT_DROP :
+ IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
+ b0->error = error0 ? error_node->errors[error0] : 0;
+
+ /* vxlan-gbp-input node expect current at VXLAN_GBP header */
+ if (is_ip4)
+ vlib_buffer_advance (b0,
+ sizeof (ip4_header_t) +
+ sizeof (udp_header_t));
+ else
+ vlib_buffer_advance (b0,
+ sizeof (ip6_header_t) +
+ sizeof (udp_header_t));
+
+ exit0:
+ /* Process packet 1 */
+ if (proto1 != IP_PROTOCOL_UDP)
+ goto exit1; /* not UDP packet */
+
+ if (is_ip4)
+ udp1 = ip4_next_header (ip41);
+ else
+ udp1 = ip6_next_header (ip61);
+
+ if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
+ goto exit1; /* not VXLAN_GBP packet */
+
+ /* Validate DIP against VTEPs */
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip41->dst_address.as_u32)
+ {
+ if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
+ goto exit1; /* no local VTEP for VXLAN_GBP packet */
+ addr4 = ip41->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
+ {
+ if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
+ goto exit1; /* no local VTEP for VXLAN_GBP packet */
+ addr6 = ip61->dst_address;
+ }
+ }
+
+ flags1 = b1->flags;
+ good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+
+ /* Don't verify UDP checksum for packets with explicit zero checksum. */
+ good_udp1 |= udp1->checksum == 0;
+
+ /* Verify UDP length */
+ if (is_ip4)
+ ip_len1 = clib_net_to_host_u16 (ip41->length);
+ else
+ ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
+ udp_len1 = clib_net_to_host_u16 (udp1->length);
+ len_diff1 = ip_len1 - udp_len1;
+
+ /* Verify UDP checksum */
+ if (PREDICT_FALSE (!good_udp1))
+ {
+ if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
+ {
+ if (is_ip4)
+ flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
+ else
+ flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
+ good_udp1 =
+ (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+ }
+ }
+
+ if (is_ip4)
+ {
+ error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
+ error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
+ }
+ else
+ {
+ error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
+ error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
+ }
+
+ next1 = error1 ?
+ IP_VXLAN_GBP_BYPASS_NEXT_DROP :
+ IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
+ b1->error = error1 ? error_node->errors[error1] : 0;
+
+ /* vxlan_gbp-input node expect current at VXLAN_GBP header */
+ if (is_ip4)
+ vlib_buffer_advance (b1,
+ sizeof (ip4_header_t) +
+ sizeof (udp_header_t));
+ else
+ vlib_buffer_advance (b1,
+ sizeof (ip6_header_t) +
+ sizeof (udp_header_t));
+
+ exit1:
+ 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 *ip40;
+ ip6_header_t *ip60;
+ udp_header_t *udp0;
+ u32 bi0, ip_len0, udp_len0, flags0, next0;
+ i32 len_diff0;
+ u8 error0, good_udp0, proto0;
+
+ 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);
+ if (is_ip4)
+ ip40 = vlib_buffer_get_current (b0);
+ else
+ ip60 = vlib_buffer_get_current (b0);
+
+ /* Setup packet for next IP feature */
+ vnet_feature_next (&next0, b0);
+
+ if (is_ip4)
+ /* Treat IP4 frag packets as "experimental" protocol for now
+ until support of IP frag reassembly is implemented */
+ proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
+ else
+ proto0 = ip60->protocol;
+
+ if (proto0 != IP_PROTOCOL_UDP)
+ goto exit; /* not UDP packet */
+
+ if (is_ip4)
+ udp0 = ip4_next_header (ip40);
+ else
+ udp0 = ip6_next_header (ip60);
+
+ if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
+ goto exit; /* not VXLAN_GBP packet */
+
+ /* Validate DIP against VTEPs */
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip40->dst_address.as_u32)
+ {
+ if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
+ goto exit; /* no local VTEP for VXLAN_GBP packet */
+ addr4 = ip40->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
+ {
+ if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
+ goto exit; /* no local VTEP for VXLAN_GBP packet */
+ addr6 = ip60->dst_address;
+ }
+ }
+
+ flags0 = b0->flags;
+ good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+
+ /* Don't verify UDP checksum for packets with explicit zero checksum. */
+ good_udp0 |= udp0->checksum == 0;
+
+ /* Verify UDP length */
+ if (is_ip4)
+ ip_len0 = clib_net_to_host_u16 (ip40->length);
+ else
+ ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
+ udp_len0 = clib_net_to_host_u16 (udp0->length);
+ len_diff0 = ip_len0 - udp_len0;
+
+ /* Verify UDP checksum */
+ if (PREDICT_FALSE (!good_udp0))
+ {
+ if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
+ {
+ if (is_ip4)
+ flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
+ else
+ flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
+ good_udp0 =
+ (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
+ }
+ }
+
+ if (is_ip4)
+ {
+ error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
+ error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
+ }
+ else
+ {
+ error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
+ error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
+ }
+
+ next0 = error0 ?
+ IP_VXLAN_GBP_BYPASS_NEXT_DROP :
+ IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
+ b0->error = error0 ? error_node->errors[error0] : 0;
+
+ /* vxlan_gbp-input node expect current at VXLAN_GBP header */
+ if (is_ip4)
+ vlib_buffer_advance (b0,
+ sizeof (ip4_header_t) +
+ sizeof (udp_header_t));
+ else
+ vlib_buffer_advance (b0,
+ sizeof (ip6_header_t) +
+ sizeof (udp_header_t));
+
+ exit:
+ 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);
+ }
+
+ return frame->n_vectors;
+}
+
+VLIB_NODE_FN (ip4_vxlan_gbp_bypass_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip_vxlan_gbp_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_vxlan_gbp_bypass_node) =
+{
+ .name = "ip4-vxlan-gbp-bypass",
+ .vector_size = sizeof (u32),
+ .n_next_nodes = IP_VXLAN_GBP_BYPASS_N_NEXT,
+ .next_nodes = {
+ [IP_VXLAN_GBP_BYPASS_NEXT_DROP] = "error-drop",
+ [IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP] = "vxlan4-gbp-input",
+ },
+ .format_buffer = format_ip4_header,
+ .format_trace = format_ip4_forward_next_trace,
+};
+/* *INDENT-ON* */
+
+#ifndef CLIB_MARCH_VARIANT
+/* Dummy init function to get us linked in. */
+clib_error_t *
+ip4_vxlan_gbp_bypass_init (vlib_main_t * vm)
+{
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (ip4_vxlan_gbp_bypass_init);
+#endif /* CLIB_MARCH_VARIANT */
+
+VLIB_NODE_FN (ip6_vxlan_gbp_bypass_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip_vxlan_gbp_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip6_vxlan_gbp_bypass_node) =
+{
+ .name = "ip6-vxlan-gbp-bypass",
+ .vector_size = sizeof (u32),
+ .n_next_nodes = IP_VXLAN_GBP_BYPASS_N_NEXT,
+ .next_nodes = {
+ [IP_VXLAN_GBP_BYPASS_NEXT_DROP] = "error-drop",
+ [IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP] = "vxlan6-gbp-input",
+ },
+ .format_buffer = format_ip6_header,
+ .format_trace = format_ip6_forward_next_trace,
+};
+/* *INDENT-ON* */
+
+#ifndef CLIB_MARCH_VARIANT
+/* Dummy init function to get us linked in. */
+clib_error_t *
+ip6_vxlan_gbp_bypass_init (vlib_main_t * vm)
+{
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (ip6_vxlan_gbp_bypass_init);
+#endif /* CLIB_MARCH_VARIANT */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff