--- /dev/null
+/*
+ * decap.c: gtpu tunnel decap packet processing
+ *
+ * Copyright (c) 2013 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 <gtpu/gtpu.h>
+
+vlib_node_registration_t gtpu4_input_node;
+vlib_node_registration_t gtpu6_input_node;
+
+typedef struct {
+ u32 next_index;
+ u32 tunnel_index;
+ u32 error;
+ u32 teid;
+} gtpu_rx_trace_t;
+
+static u8 * format_gtpu_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 *);
+ gtpu_rx_trace_t * t = va_arg (*args, gtpu_rx_trace_t *);
+
+ if (t->tunnel_index != ~0)
+ {
+ s = format (s, "GTPU decap from gtpu_tunnel%d teid %d next %d error %d",
+ t->tunnel_index, t->teid, t->next_index, t->error);
+ }
+ else
+ {
+ s = format (s, "GTPU decap error - tunnel for teid %d does not exist",
+ t->teid);
+ }
+ return s;
+}
+
+always_inline u32
+validate_gtpu_fib (vlib_buffer_t *b, gtpu_tunnel_t *t, u32 is_ip4)
+{
+ u32 fib_index, sw_if_index;
+
+ sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+
+ if (is_ip4)
+ fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
+ vec_elt (ip4_main.fib_index_by_sw_if_index, sw_if_index) :
+ vnet_buffer (b)->sw_if_index[VLIB_TX];
+ else
+ fib_index = (vnet_buffer (b)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
+ vec_elt (ip6_main.fib_index_by_sw_if_index, sw_if_index) :
+ vnet_buffer (b)->sw_if_index[VLIB_TX];
+
+ return (fib_index == t->encap_fib_index);
+}
+
+always_inline uword
+gtpu_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ u32 is_ip4)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ gtpu_main_t * gtm = >pu_main;
+ vnet_main_t * vnm = gtm->vnet_main;
+ vnet_interface_main_t * im = &vnm->interface_main;
+ u32 last_tunnel_index = ~0;
+ gtpu4_tunnel_key_t last_key4;
+ gtpu6_tunnel_key_t last_key6;
+ u32 pkts_decapsulated = 0;
+ u32 thread_index = vlib_get_thread_index();
+ u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
+
+ if (is_ip4)
+ last_key4.as_u64 = ~0;
+ else
+ memset (&last_key6, 0xff, sizeof (last_key6));
+
+ 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 next0, next1;
+ ip4_header_t * ip4_0, * ip4_1;
+ ip6_header_t * ip6_0, * ip6_1;
+ gtpu_header_t * gtpu0, * gtpu1;
+ u32 gtpu_hdr_len0 = 0, gtpu_hdr_len1 =0 ;
+ uword * p0, * p1;
+ u32 tunnel_index0, tunnel_index1;
+ gtpu_tunnel_t * t0, * t1, * mt0 = NULL, * mt1 = NULL;
+ gtpu4_tunnel_key_t key4_0, key4_1;
+ gtpu6_tunnel_key_t key6_0, key6_1;
+ u32 error0, error1;
+ u32 sw_if_index0, sw_if_index1, len0, len1;
+
+ /* 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);
+
+ /* udp leaves current_data pointing at the gtpu header */
+ gtpu0 = vlib_buffer_get_current (b0);
+ gtpu1 = vlib_buffer_get_current (b1);
+ if (is_ip4) {
+ vlib_buffer_advance
+ (b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
+ vlib_buffer_advance
+ (b1, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
+ ip4_0 = vlib_buffer_get_current (b0);
+ ip4_1 = vlib_buffer_get_current (b1);
+ } else {
+ vlib_buffer_advance
+ (b0, -(word)(sizeof(udp_header_t)+sizeof(ip6_header_t)));
+ vlib_buffer_advance
+ (b1, -(word)(sizeof(udp_header_t)+sizeof(ip6_header_t)));
+ ip6_0 = vlib_buffer_get_current (b0);
+ ip6_1 = vlib_buffer_get_current (b1);
+ }
+
+ /* pop (ip, udp, gtpu) */
+ if (is_ip4) {
+ vlib_buffer_advance
+ (b0, sizeof(*ip4_0)+sizeof(udp_header_t));
+ vlib_buffer_advance
+ (b1, sizeof(*ip4_1)+sizeof(udp_header_t));
+ } else {
+ vlib_buffer_advance
+ (b0, sizeof(*ip6_0)+sizeof(udp_header_t));
+ vlib_buffer_advance
+ (b1, sizeof(*ip6_1)+sizeof(udp_header_t));
+ }
+
+ tunnel_index0 = ~0;
+ error0 = 0;
+
+ tunnel_index1 = ~0;
+ error1 = 0;
+
+ if (PREDICT_FALSE ((gtpu0->ver_flags & GTPU_VER_MASK) != GTPU_V1_VER))
+ {
+ error0 = GTPU_ERROR_BAD_VER;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ /* Manipulate packet 0 */
+ if (is_ip4) {
+ key4_0.src = ip4_0->src_address.as_u32;
+ key4_0.teid = gtpu0->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
+ {
+ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
+ if (PREDICT_FALSE (p0 == NULL))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+ last_key4.as_u64 = key4_0.as_u64;
+ tunnel_index0 = last_tunnel_index = p0[0];
+ }
+ else
+ tunnel_index0 = last_tunnel_index;
+ t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
+ goto next0; /* valid packet */
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address)))
+ {
+ key4_0.src = ip4_0->dst_address.as_u32;
+ key4_0.teid = gtpu0->teid;
+ /* Make sure mcast GTPU tunnel exist by packet DIP and teid */
+ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
+ if (PREDICT_TRUE (p0 != NULL))
+ {
+ mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
+ goto next0; /* valid packet */
+ }
+ }
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+
+ } else /* !is_ip4 */ {
+ key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0];
+ key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1];
+ key6_0.teid = gtpu0->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0))
+ {
+ p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
+ if (PREDICT_FALSE (p0 == NULL))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+ clib_memcpy (&last_key6, &key6_0, sizeof(key6_0));
+ tunnel_index0 = last_tunnel_index = p0[0];
+ }
+ else
+ tunnel_index0 = last_tunnel_index;
+ t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
+ &t0->src.ip6)))
+ goto next0; /* valid packet */
+ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address)))
+ {
+ key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0];
+ key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1];
+ key6_0.teid = gtpu0->teid;
+ p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
+ if (PREDICT_TRUE (p0 != NULL))
+ {
+ mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
+ goto next0; /* valid packet */
+ }
+ }
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ next0:
+ /* Manipulate gtpu header */
+ if (PREDICT_FALSE((gtpu0->ver_flags & GTPU_E_S_PN_BIT) != 0))
+ {
+ gtpu_hdr_len0 = sizeof(gtpu_header_t);
+
+ /* Manipulate Sequence Number and N-PDU Number */
+ /* TBD */
+
+ /* Manipulate Next Extension Header */
+ /* TBD */
+ }
+ else
+ {
+ gtpu_hdr_len0 = sizeof(gtpu_header_t) - 4;
+ }
+
+ /* Pop gtpu header */
+ vlib_buffer_advance (b0, gtpu_hdr_len0);
+
+ next0 = t0->decap_next_index;
+ sw_if_index0 = t0->sw_if_index;
+ len0 = vlib_buffer_length_in_chain (vm, b0);
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ if (PREDICT_TRUE(next0 == GTPU_INPUT_NEXT_L2_INPUT))
+ vnet_update_l2_len (b0);
+
+ /* Set packet input sw_if_index to unicast GTPU tunnel for learning */
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
+ sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
+
+ pkts_decapsulated ++;
+ stats_n_packets += 1;
+ stats_n_bytes += len0;
+
+ /* Batch stats increment on the same gtpu tunnel so counter
+ is not incremented per packet */
+ 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_RX,
+ thread_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;
+ }
+
+ trace0:
+ b0->error = error0 ? node->errors[error0] : 0;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gtpu_rx_trace_t *tr
+ = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->tunnel_index = tunnel_index0;
+ tr->teid = clib_net_to_host_u32(gtpu0->teid);
+ }
+
+ if (PREDICT_FALSE ((gtpu1->ver_flags & GTPU_VER_MASK) != GTPU_V1_VER))
+ {
+ error1 = GTPU_ERROR_BAD_VER;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+
+ /* Manipulate packet 1 */
+ if (is_ip4) {
+ key4_1.src = ip4_1->src_address.as_u32;
+ key4_1.teid = gtpu1->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
+ {
+ p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64);
+ if (PREDICT_FALSE (p1 == NULL))
+ {
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+ last_key4.as_u64 = key4_1.as_u64;
+ tunnel_index1 = last_tunnel_index = p1[0];
+ }
+ else
+ tunnel_index1 = last_tunnel_index;
+ t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0))
+ {
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip4_1->dst_address.as_u32 == t1->src.ip4.as_u32))
+ goto next1; /* valid packet */
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_1->dst_address)))
+ {
+ key4_1.src = ip4_1->dst_address.as_u32;
+ key4_1.teid = gtpu1->teid;
+ /* Make sure mcast GTPU tunnel exist by packet DIP and teid */
+ p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64);
+ if (PREDICT_TRUE (p1 != NULL))
+ {
+ mt1 = pool_elt_at_index (gtm->tunnels, p1[0]);
+ goto next1; /* valid packet */
+ }
+ }
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+
+ } else /* !is_ip4 */ {
+ key6_1.src.as_u64[0] = ip6_1->src_address.as_u64[0];
+ key6_1.src.as_u64[1] = ip6_1->src_address.as_u64[1];
+ key6_1.teid = gtpu1->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (memcmp(&key6_1, &last_key6, sizeof(last_key6)) != 0))
+ {
+ p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1);
+
+ if (PREDICT_FALSE (p1 == NULL))
+ {
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+
+ clib_memcpy (&last_key6, &key6_1, sizeof(key6_1));
+ tunnel_index1 = last_tunnel_index = p1[0];
+ }
+ else
+ tunnel_index1 = last_tunnel_index;
+ t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0))
+ {
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
+ &t1->src.ip6)))
+ goto next1; /* valid packet */
+ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_1->dst_address)))
+ {
+ key6_1.src.as_u64[0] = ip6_1->dst_address.as_u64[0];
+ key6_1.src.as_u64[1] = ip6_1->dst_address.as_u64[1];
+ key6_1.teid = gtpu1->teid;
+ p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1);
+ if (PREDICT_TRUE (p1 != NULL))
+ {
+ mt1 = pool_elt_at_index (gtm->tunnels, p1[0]);
+ goto next1; /* valid packet */
+ }
+ }
+ error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next1 = GTPU_INPUT_NEXT_DROP;
+ goto trace1;
+ }
+
+ next1:
+ /* Manipulate gtpu header */
+ if (PREDICT_FALSE((gtpu1->ver_flags & GTPU_E_S_PN_BIT) != 0))
+ {
+ gtpu_hdr_len1 = sizeof(gtpu_header_t);
+
+ /* Manipulate Sequence Number and N-PDU Number */
+ /* TBD */
+
+ /* Manipulate Next Extension Header */
+ /* TBD */
+ }
+ else
+ {
+ gtpu_hdr_len1 = sizeof(gtpu_header_t) - 4;
+ }
+
+ /* Pop gtpu header */
+ vlib_buffer_advance (b1, gtpu_hdr_len1);
+
+ next1 = t1->decap_next_index;
+ sw_if_index1 = t1->sw_if_index;
+ len1 = vlib_buffer_length_in_chain (vm, b1);
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ if (PREDICT_TRUE(next1 == GTPU_INPUT_NEXT_L2_INPUT))
+ vnet_update_l2_len (b1);
+
+ /* Set packet input sw_if_index to unicast GTPU tunnel for learning */
+ vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
+ sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
+
+ pkts_decapsulated ++;
+ stats_n_packets += 1;
+ stats_n_bytes += len1;
+
+ /* Batch stats increment on the same gtpu tunnel so counter
+ is not incremented per packet */
+ if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
+ {
+ stats_n_packets -= 1;
+ stats_n_bytes -= len1;
+ if (stats_n_packets)
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
+ thread_index, stats_sw_if_index,
+ stats_n_packets, stats_n_bytes);
+ stats_n_packets = 1;
+ stats_n_bytes = len1;
+ stats_sw_if_index = sw_if_index1;
+ }
+
+ trace1:
+ b1->error = error1 ? node->errors[error1] : 0;
+
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gtpu_rx_trace_t *tr
+ = vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->next_index = next1;
+ tr->error = error1;
+ tr->tunnel_index = tunnel_index1;
+ tr->teid = clib_net_to_host_u32(gtpu1->teid);
+ }
+
+ 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 next0;
+ ip4_header_t * ip4_0;
+ ip6_header_t * ip6_0;
+ gtpu_header_t * gtpu0;
+ u32 gtpu_hdr_len0 = 0;
+ uword * p0;
+ u32 tunnel_index0;
+ gtpu_tunnel_t * t0, * mt0 = NULL;
+ gtpu4_tunnel_key_t key4_0;
+ gtpu6_tunnel_key_t key6_0;
+ u32 error0;
+ u32 sw_if_index0, len0;
+
+ 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);
+
+ /* udp leaves current_data pointing at the gtpu header */
+ gtpu0 = vlib_buffer_get_current (b0);
+ if (is_ip4) {
+ vlib_buffer_advance
+ (b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
+ ip4_0 = vlib_buffer_get_current (b0);
+ } else {
+ vlib_buffer_advance
+ (b0, -(word)(sizeof(udp_header_t)+sizeof(ip6_header_t)));
+ ip6_0 = vlib_buffer_get_current (b0);
+ }
+
+ /* pop (ip, udp) */
+ if (is_ip4) {
+ vlib_buffer_advance
+ (b0, sizeof(*ip4_0)+sizeof(udp_header_t));
+ } else {
+ vlib_buffer_advance
+ (b0, sizeof(*ip6_0)+sizeof(udp_header_t));
+ }
+
+ tunnel_index0 = ~0;
+ error0 = 0;
+ if (PREDICT_FALSE ((gtpu0->ver_flags & GTPU_VER_MASK) != GTPU_V1_VER))
+ {
+ error0 = GTPU_ERROR_BAD_VER;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ if (is_ip4) {
+ key4_0.src = ip4_0->src_address.as_u32;
+ key4_0.teid = gtpu0->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
+ {
+ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
+ if (PREDICT_FALSE (p0 == NULL))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+ last_key4.as_u64 = key4_0.as_u64;
+ tunnel_index0 = last_tunnel_index = p0[0];
+ }
+ else
+ tunnel_index0 = last_tunnel_index;
+ t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
+ goto next00; /* valid packet */
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address)))
+ {
+ key4_0.src = ip4_0->dst_address.as_u32;
+ key4_0.teid = gtpu0->teid;
+ /* Make sure mcast GTPU tunnel exist by packet DIP and teid */
+ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
+ if (PREDICT_TRUE (p0 != NULL))
+ {
+ mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
+ goto next00; /* valid packet */
+ }
+ }
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+
+ } else /* !is_ip4 */ {
+ key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0];
+ key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1];
+ key6_0.teid = gtpu0->teid;
+
+ /* Make sure GTPU tunnel exist according to packet SIP and teid
+ * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
+ if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0))
+ {
+ p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
+ if (PREDICT_FALSE (p0 == NULL))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+ clib_memcpy (&last_key6, &key6_0, sizeof(key6_0));
+ tunnel_index0 = last_tunnel_index = p0[0];
+ }
+ else
+ tunnel_index0 = last_tunnel_index;
+ t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
+
+ /* Validate GTPU tunnel encap-fib index agaist packet */
+ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
+ {
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ /* Validate GTPU tunnel SIP against packet DIP */
+ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
+ &t0->src.ip6)))
+ goto next00; /* valid packet */
+ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address)))
+ {
+ key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0];
+ key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1];
+ key6_0.teid = gtpu0->teid;
+ p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
+ if (PREDICT_TRUE (p0 != NULL))
+ {
+ mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
+ goto next00; /* valid packet */
+ }
+ }
+ error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
+ next0 = GTPU_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ next00:
+ /* Manipulate gtpu header */
+ if (PREDICT_FALSE((gtpu0->ver_flags & GTPU_E_S_PN_BIT) != 0))
+ {
+ gtpu_hdr_len0 = sizeof(gtpu_header_t);
+
+ /* Manipulate Sequence Number and N-PDU Number */
+ /* TBD */
+
+ /* Manipulate Next Extension Header */
+ /* TBD */
+ }
+ else
+ {
+ gtpu_hdr_len0 = sizeof(gtpu_header_t) - 4;
+ }
+
+ /* Pop gtpu header */
+ vlib_buffer_advance (b0, gtpu_hdr_len0);
+
+ next0 = t0->decap_next_index;
+ sw_if_index0 = t0->sw_if_index;
+ len0 = vlib_buffer_length_in_chain (vm, b0);
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ if (PREDICT_TRUE(next0 == GTPU_INPUT_NEXT_L2_INPUT))
+ vnet_update_l2_len (b0);
+
+ /* Set packet input sw_if_index to unicast GTPU tunnel for learning */
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
+ sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
+
+ pkts_decapsulated ++;
+ stats_n_packets += 1;
+ stats_n_bytes += len0;
+
+ /* Batch stats increment on the same gtpu tunnel so counter
+ is not incremented per packet */
+ 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_RX,
+ thread_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;
+ }
+
+ trace00:
+ b0->error = error0 ? node->errors[error0] : 0;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gtpu_rx_trace_t *tr
+ = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->tunnel_index = tunnel_index0;
+ tr->teid = clib_net_to_host_u32(gtpu0->teid);
+ }
+ 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, is_ip4?
+ gtpu4_input_node.index:gtpu6_input_node.index,
+ GTPU_ERROR_DECAPSULATED,
+ pkts_decapsulated);
+
+ /* Increment any remaining batch stats */
+ if (stats_n_packets)
+ {
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
+ thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
+ node->runtime_data[0] = stats_sw_if_index;
+ }
+
+ return from_frame->n_vectors;
+}
+
+static uword
+gtpu4_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return gtpu_input(vm, node, from_frame, /* is_ip4 */ 1);
+}
+
+static uword
+gtpu6_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return gtpu_input(vm, node, from_frame, /* is_ip4 */ 0);
+}
+
+static char * gtpu_error_strings[] = {
+#define gtpu_error(n,s) s,
+#include <gtpu/gtpu_error.def>
+#undef gtpu_error
+#undef _
+};
+
+VLIB_REGISTER_NODE (gtpu4_input_node) = {
+ .function = gtpu4_input,
+ .name = "gtpu4-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = GTPU_N_ERROR,
+ .error_strings = gtpu_error_strings,
+
+ .n_next_nodes = GTPU_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [GTPU_INPUT_NEXT_##s] = n,
+ foreach_gtpu_input_next
+#undef _
+ },
+
+//temp .format_buffer = format_gtpu_header,
+ .format_trace = format_gtpu_rx_trace,
+ // $$$$ .unformat_buffer = unformat_gtpu_header,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gtpu4_input_node, gtpu4_input)
+
+VLIB_REGISTER_NODE (gtpu6_input_node) = {
+ .function = gtpu6_input,
+ .name = "gtpu6-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = GTPU_N_ERROR,
+ .error_strings = gtpu_error_strings,
+
+ .n_next_nodes = GTPU_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [GTPU_INPUT_NEXT_##s] = n,
+ foreach_gtpu_input_next
+#undef _
+ },
+
+//temp .format_buffer = format_gtpu_header,
+ .format_trace = format_gtpu_rx_trace,
+ // $$$$ .unformat_buffer = unformat_gtpu_header,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gtpu6_input_node, gtpu6_input)
+
+
+typedef enum {
+ IP_GTPU_BYPASS_NEXT_DROP,
+ IP_GTPU_BYPASS_NEXT_GTPU,
+ IP_GTPU_BYPASS_N_NEXT,
+} ip_vxan_bypass_next_t;
+
+always_inline uword
+ip_gtpu_bypass_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ u32 is_ip4)
+{
+ gtpu_main_t * gtm = >pu_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(vnet_buffer(b0)->sw_if_index[VLIB_RX], &next0, b0);
+ vnet_feature_next(vnet_buffer(b1)->sw_if_index[VLIB_RX], &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_GTPU))
+ goto exit0; /* not GTPU packet */
+
+ /* Validate DIP against VTEPs*/
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip40->dst_address.as_u32)
+ {
+ if (!hash_get (gtm->vtep4, ip40->dst_address.as_u32))
+ goto exit0; /* no local VTEP for GTPU packet */
+ addr4 = ip40->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
+ {
+ if (!hash_get_mem (gtm->vtep6, &ip60->dst_address))
+ goto exit0; /* no local VTEP for GTPU packet */
+ addr6 = ip60->dst_address;
+ }
+ }
+
+ flags0 = b0->flags;
+ good_udp0 = (flags0 & IP_BUFFER_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 & IP_BUFFER_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 & IP_BUFFER_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_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
+ b0->error = error0 ? error_node->errors[error0] : 0;
+
+ /* gtpu-input node expect current at GTPU 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_GTPU))
+ goto exit1; /* not GTPU packet */
+
+ /* Validate DIP against VTEPs*/
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip41->dst_address.as_u32)
+ {
+ if (!hash_get (gtm->vtep4, ip41->dst_address.as_u32))
+ goto exit1; /* no local VTEP for GTPU packet */
+ addr4 = ip41->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
+ {
+ if (!hash_get_mem (gtm->vtep6, &ip61->dst_address))
+ goto exit1; /* no local VTEP for GTPU packet */
+ addr6 = ip61->dst_address;
+ }
+ }
+
+ flags1 = b1->flags;
+ good_udp1 = (flags1 & IP_BUFFER_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 & IP_BUFFER_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 & IP_BUFFER_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_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
+ b1->error = error1 ? error_node->errors[error1] : 0;
+
+ /* gtpu-input node expect current at GTPU 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(vnet_buffer(b0)->sw_if_index[VLIB_RX], &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_GTPU))
+ goto exit; /* not GTPU packet */
+
+ /* Validate DIP against VTEPs*/
+ if (is_ip4)
+ {
+ if (addr4.as_u32 != ip40->dst_address.as_u32)
+ {
+ if (!hash_get (gtm->vtep4, ip40->dst_address.as_u32))
+ goto exit; /* no local VTEP for GTPU packet */
+ addr4 = ip40->dst_address;
+ }
+ }
+ else
+ {
+ if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
+ {
+ if (!hash_get_mem (gtm->vtep6, &ip60->dst_address))
+ goto exit; /* no local VTEP for GTPU packet */
+ addr6 = ip60->dst_address;
+ }
+ }
+
+ flags0 = b0->flags;
+ good_udp0 = (flags0 & IP_BUFFER_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 & IP_BUFFER_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 & IP_BUFFER_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_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
+ b0->error = error0 ? error_node->errors[error0] : 0;
+
+ /* gtpu-input node expect current at GTPU 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;
+}
+
+static uword
+ip4_gtpu_bypass (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
+}
+
+VLIB_REGISTER_NODE (ip4_gtpu_bypass_node) = {
+ .function = ip4_gtpu_bypass,
+ .name = "ip4-gtpu-bypass",
+ .vector_size = sizeof (u32),
+
+ .n_next_nodes = IP_GTPU_BYPASS_N_NEXT,
+ .next_nodes = {
+ [IP_GTPU_BYPASS_NEXT_DROP] = "error-drop",
+ [IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu4-input",
+ },
+
+ .format_buffer = format_ip4_header,
+ .format_trace = format_ip4_forward_next_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_gtpu_bypass_node,ip4_gtpu_bypass)
+
+/* Dummy init function to get us linked in. */
+clib_error_t * ip4_gtpu_bypass_init (vlib_main_t * vm)
+{ return 0; }
+
+VLIB_INIT_FUNCTION (ip4_gtpu_bypass_init);
+
+static uword
+ip6_gtpu_bypass (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
+}
+
+VLIB_REGISTER_NODE (ip6_gtpu_bypass_node) = {
+ .function = ip6_gtpu_bypass,
+ .name = "ip6-gtpu-bypass",
+ .vector_size = sizeof (u32),
+
+ .n_next_nodes = IP_GTPU_BYPASS_N_NEXT,
+ .next_nodes = {
+ [IP_GTPU_BYPASS_NEXT_DROP] = "error-drop",
+ [IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu6-input",
+ },
+
+ .format_buffer = format_ip6_header,
+ .format_trace = format_ip6_forward_next_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_gtpu_bypass_node,ip6_gtpu_bypass)
+
+/* Dummy init function to get us linked in. */
+clib_error_t * ip6_gtpu_bypass_init (vlib_main_t * vm)
+{ return 0; }
+
+VLIB_INIT_FUNCTION (ip6_gtpu_bypass_init);
Code Review / vpp.git / blobdiff