+static inline void
+ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
+ ip4_local_last_check_t * last_check, u8 * error0)
+{
+ ip4_fib_mtrie_leaf_t leaf0;
+ ip4_fib_mtrie_t *mtrie0;
+ const dpo_id_t *dpo0;
+ load_balance_t *lb0;
+ u32 lbi0;
+
+ vnet_buffer (b)->ip.fib_index =
+ vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
+ vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
+
+ /*
+ * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
+ * adjacency for the destination address (the local interface address).
+ * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
+ * adjacency for the source address (the remote sender's address)
+ */
+ if (PREDICT_FALSE (last_check->first ||
+ (last_check->src.as_u32 != ip0->src_address.as_u32)))
+ {
+ mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
+ leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
+ lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
+
+ vnet_buffer (b)->ip.adj_index[VLIB_RX] =
+ vnet_buffer (b)->ip.adj_index[VLIB_TX];
+ vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
+
+ lb0 = load_balance_get (lbi0);
+ dpo0 = load_balance_get_bucket_i (lb0, 0);
+
+ /*
+ * Must have a route to source otherwise we drop the packet.
+ * ip4 broadcasts are accepted, e.g. to make dhcp client work
+ *
+ * The checks are:
+ * - the source is a recieve => it's from us => bogus, do this
+ * first since it sets a different error code.
+ * - uRPF check for any route to source - accept if passes.
+ * - allow packets destined to the broadcast address from unknown sources
+ */
+
+ *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
+ && dpo0->dpoi_type == DPO_RECEIVE) ?
+ IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
+ *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
+ && !fib_urpf_check_size (lb0->lb_urpf)
+ && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
+ IP4_ERROR_SRC_LOOKUP_MISS : *error0);
+
+ last_check->src.as_u32 = ip0->src_address.as_u32;
+ last_check->lbi = lbi0;
+ last_check->error = *error0;
+ }
+ else
+ {
+ vnet_buffer (b)->ip.adj_index[VLIB_RX] =
+ vnet_buffer (b)->ip.adj_index[VLIB_TX];
+ vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
+ *error0 = last_check->error;
+ last_check->first = 0;
+ }
+}
+
+static inline void
+ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
+ ip4_local_last_check_t * last_check, u8 * error)
+{
+ ip4_fib_mtrie_leaf_t leaf[2];
+ ip4_fib_mtrie_t *mtrie[2];
+ const dpo_id_t *dpo[2];
+ load_balance_t *lb[2];
+ u32 not_last_hit;
+ u32 lbi[2];
+
+ not_last_hit = last_check->first;
+ not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
+ not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
+
+ vnet_buffer (b[0])->ip.fib_index =
+ vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
+ vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
+ vnet_buffer (b[0])->ip.fib_index;
+
+ vnet_buffer (b[1])->ip.fib_index =
+ vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
+ vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
+ vnet_buffer (b[1])->ip.fib_index;