--- /dev/null
+/*
+ * ip/ip6_neighbor.c: IP6 neighbor handling
+ *
+ * Copyright (c) 2010 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 <vnet/ip-neighbor/ip6_neighbor.h>
+
+void
+ip6_neighbor_probe_dst (const ip_adjacency_t * adj, const ip6_address_t * dst)
+{
+ ip_interface_address_t *ia;
+ ip6_address_t *src;
+
+ src = ip6_interface_address_matching_destination
+ (&ip6_main, dst, adj->rewrite_header.sw_if_index, &ia);
+
+ if (!src)
+ return;
+
+ ip6_neighbor_probe (vlib_get_main (), vnet_get_main (), adj, src, dst);
+}
+
+void
+ip6_neighbor_advertise (vlib_main_t * vm,
+ vnet_main_t * vnm,
+ u32 sw_if_index, const ip6_address_t * addr)
+{
+ vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ ip6_main_t *i6m = &ip6_main;
+ u8 *rewrite, rewrite_len;
+ u8 dst_address[6];
+
+ if (NULL == addr)
+ addr = ip6_interface_first_address (i6m, sw_if_index);
+
+ if (addr)
+ {
+ clib_warning
+ ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d",
+ format_ip6_address, addr, sw_if_index);
+
+ /* Form unsolicited neighbor advertisement packet from NS pkt template */
+ int bogus_length;
+ u32 bi = 0;
+ icmp6_neighbor_solicitation_header_t *h =
+ vlib_packet_template_get_packet (vm,
+ &ip6_neighbor_packet_template,
+ &bi);
+ if (!h)
+ return;
+
+ ip6_set_reserved_multicast_address (&h->ip.dst_address,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_hosts);
+ h->ip.src_address = addr[0];
+ h->neighbor.icmp.type = ICMP6_neighbor_advertisement;
+ h->neighbor.target_address = addr[0];
+ h->neighbor.advertisement_flags = clib_host_to_net_u32
+ (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
+ h->link_layer_option.header.type =
+ ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
+ clib_memcpy (h->link_layer_option.ethernet_address,
+ hi->hw_address, vec_len (hi->hw_address));
+ h->neighbor.icmp.checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
+ ASSERT (bogus_length == 0);
+
+ /* Setup MAC header with IP6 Etype and mcast DMAC */
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ ip6_multicast_ethernet_address (dst_address,
+ IP6_MULTICAST_GROUP_ID_all_hosts);
+ rewrite =
+ ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address);
+ rewrite_len = vec_len (rewrite);
+ vlib_buffer_advance (b, -rewrite_len);
+ ethernet_header_t *e = vlib_buffer_get_current (b);
+ clib_memcpy (e->dst_address, rewrite, rewrite_len);
+ vec_free (rewrite);
+
+ /* Send unsolicited ND advertisement packet out the specified interface */
+ vnet_buffer (b)->sw_if_index[VLIB_RX] =
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
+ vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
+ u32 *to_next = vlib_frame_vector_args (f);
+ to_next[0] = bi;
+ f->n_vectors = 1;
+ vlib_put_frame_to_node (vm, hi->output_node_index, f);
+ }
+}
+
+typedef enum
+{
+ IP6_NBR_NEXT_DROP,
+ IP6_NBR_NEXT_REPLY_TX,
+ IP6_NBR_N_NEXT,
+} ip6_discover_neighbor_next_t;
+
+typedef enum
+{
+ IP6_NBR_ERROR_DROP,
+ IP6_NBR_ERROR_REQUEST_SENT,
+ IP6_NBR_ERROR_NO_SOURCE_ADDRESS,
+ IP6_NBR_ERROR_NO_BUFFERS,
+} ip6_discover_neighbor_error_t;
+
+static uword
+ip6_discover_neighbor_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_glean)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ ip6_main_t *im = &ip6_main;
+ u32 *from, *to_next_drop;
+ uword n_left_from, n_left_to_next_drop;
+ u64 seed;
+ u32 thread_index = vm->thread_index;
+
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ ip6_forward_next_trace (vm, node, frame, VLIB_TX);
+
+ seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm));
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, IP6_NBR_NEXT_DROP,
+ to_next_drop, n_left_to_next_drop);
+
+ while (n_left_from > 0 && n_left_to_next_drop > 0)
+ {
+ u32 pi0, adj_index0, sw_if_index0, drop0, r0;
+ vnet_hw_interface_t *hw_if0;
+ vlib_buffer_t *p0, *b0;
+ ip_adjacency_t *adj0;
+ ip6_address_t src;
+ ip6_header_t *ip0;
+
+ pi0 = from[0];
+
+ p0 = vlib_get_buffer (vm, pi0);
+
+ adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+
+ ip0 = vlib_buffer_get_current (p0);
+
+ adj0 = adj_get (adj_index0);
+
+ if (!is_glean)
+ {
+ ip0->dst_address.as_u64[0] =
+ adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
+ ip0->dst_address.as_u64[1] =
+ adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
+ }
+
+ sw_if_index0 = adj0->rewrite_header.sw_if_index;
+ vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
+
+ /* combine the address and interface for a hash */
+ r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0;
+
+ drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed);
+
+ from += 1;
+ n_left_from -= 1;
+ to_next_drop[0] = pi0;
+ to_next_drop += 1;
+ n_left_to_next_drop -= 1;
+
+ hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
+
+ /* If the interface is link-down, drop the pkt */
+ if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
+ drop0 = 1;
+
+ if (!ip6_link_is_enabled (sw_if_index0))
+ drop0 = 1;
+
+ /*
+ * the adj has been updated to a rewrite but the node the DPO that got
+ * us here hasn't - yet. no big deal. we'll drop while we wait.
+ */
+ if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
+ drop0 = 1;
+
+ if (drop0)
+ {
+ p0->error = node->errors[IP6_NBR_ERROR_DROP];
+ continue;
+ }
+
+ /*
+ * Choose source address based on destination lookup
+ * adjacency.
+ */
+ if (!ip6_src_address_for_packet (sw_if_index0,
+ &ip0->dst_address, &src))
+ {
+ /* There is no address on the interface */
+ p0->error = node->errors[IP6_NBR_ERROR_NO_SOURCE_ADDRESS];
+ continue;
+ }
+
+ b0 = ip6_neighbor_probe (vm, vnm, adj0, &src, &ip0->dst_address);
+
+ if (PREDICT_TRUE (NULL != b0))
+ {
+ clib_memcpy_fast (b0->opaque2, p0->opaque2,
+ sizeof (p0->opaque2));
+ b0->flags |= p0->flags & VLIB_BUFFER_IS_TRACED;
+ b0->trace_handle = p0->trace_handle;
+ p0->error = node->errors[IP6_NBR_ERROR_REQUEST_SENT];
+ }
+ else
+ {
+ /* There is no address on the interface */
+ p0->error = node->errors[IP6_NBR_ERROR_NO_BUFFERS];
+ continue;
+ }
+ }
+
+ vlib_put_next_frame (vm, node, IP6_NBR_NEXT_DROP, n_left_to_next_drop);
+ }
+
+ return frame->n_vectors;
+}
+
+static uword
+ip6_discover_neighbor (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return (ip6_discover_neighbor_inline (vm, node, frame, 0));
+}
+
+static uword
+ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return (ip6_discover_neighbor_inline (vm, node, frame, 1));
+}
+
+static char *ip6_discover_neighbor_error_strings[] = {
+ [IP6_NBR_ERROR_DROP] = "address overflow drops",
+ [IP6_NBR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
+ [IP6_NBR_ERROR_NO_SOURCE_ADDRESS] = "no source address for ND solicitation",
+ [IP6_NBR_ERROR_NO_BUFFERS] = "no buffers",
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip6_glean_node) =
+{
+ .function = ip6_glean,
+ .name = "ip6-glean",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip6_forward_next_trace,
+ .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
+ .error_strings = ip6_discover_neighbor_error_strings,
+ .n_next_nodes = IP6_NBR_N_NEXT,
+ .next_nodes =
+ {
+ [IP6_NBR_NEXT_DROP] = "ip6-drop",
+ [IP6_NBR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
+ },
+};
+VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
+{
+ .function = ip6_discover_neighbor,
+ .name = "ip6-discover-neighbor",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip6_forward_next_trace,
+ .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
+ .error_strings = ip6_discover_neighbor_error_strings,
+ .n_next_nodes = IP6_NBR_N_NEXT,
+ .next_nodes =
+ {
+ [IP6_NBR_NEXT_DROP] = "ip6-drop",
+ [IP6_NBR_NEXT_REPLY_TX] = "ip6-rewrite-mcast",
+ },
+};
+/* *INDENT-ON* */
+
+/* Template used to generate IP6 neighbor solicitation packets. */
+vlib_packet_template_t ip6_neighbor_packet_template;
+
+static clib_error_t *
+ip6_neighbor_init (vlib_main_t * vm)
+{
+ icmp6_neighbor_solicitation_header_t p;
+
+ clib_memset (&p, 0, sizeof (p));
+
+ p.ip.ip_version_traffic_class_and_flow_label =
+ clib_host_to_net_u32 (0x6 << 28);
+ p.ip.payload_length =
+ clib_host_to_net_u16 (sizeof (p) -
+ STRUCT_OFFSET_OF
+ (icmp6_neighbor_solicitation_header_t, neighbor));
+ p.ip.protocol = IP_PROTOCOL_ICMP6;
+ p.ip.hop_limit = 255;
+ ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
+
+ p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
+
+ p.link_layer_option.header.type =
+ ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
+ p.link_layer_option.header.n_data_u64s =
+ sizeof (p.link_layer_option) / sizeof (u64);
+
+ vlib_packet_template_init (vm,
+ &ip6_neighbor_packet_template, &p, sizeof (p),
+ /* alloc chunk size */ 8,
+ "ip6 neighbor discovery");
+
+ return NULL;
+}
+
+VLIB_INIT_FUNCTION (ip6_neighbor_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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