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authorNeale Ranns <nranns@cisco.com>2019-09-30 10:53:31 +0000
committerOle Trøan <otroan@employees.org>2019-12-17 10:56:20 +0000
commitcbe25aab3be72154f2c706c39eeba6a77f34450f (patch)
tree131fb53b5ec973be045ffb9e2eb797af01d112a0 /src/vnet/ip-neighbor/ip6_neighbor.h
parent96453fd2417ebd1d69354a7fb692976129cea80e (diff)
ip: Protocol Independent IP Neighbors
Type: feature - ip-neighbour: generic neighbour handling; APIs, DBs, event handling, aging - arp: ARP protocol implementation - ip6-nd; IPv6 neighbor discovery implementation; separate ND, MLD, RA - ip6-link; manage link-local addresses - l2-arp-term; events separated from IP neighbours, since they are not the same. vnet retains just enough education to perform ND/ARP packet construction. arp and ip6-nd to be moved to plugins soon. Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/ip-neighbor/ip6_neighbor.h')
-rw-r--r--src/vnet/ip-neighbor/ip6_neighbor.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/vnet/ip-neighbor/ip6_neighbor.h b/src/vnet/ip-neighbor/ip6_neighbor.h
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+++ b/src/vnet/ip-neighbor/ip6_neighbor.h
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+/*
+ * ip/ip6_neighbor.h: IP6 NS transmit
+ *
+ * Copyright (c) 2019 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.
+ */
+
+#ifndef __IP6_NEIGHBOR_H__
+#define __IP6_NEIGHBOR_H__
+
+#include <vlib/vlib.h>
+#include <vnet/ip/format.h>
+#include <vnet/ip/ip6.h>
+#include <vnet/ip/ip6_link.h>
+#include <vnet/ip/icmp46_packet.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/adj/adj_internal.h>
+
+/* Template used to generate IP6 neighbor solicitation packets. */
+extern vlib_packet_template_t ip6_neighbor_packet_template;
+
+extern void ip6_neighbor_advertise (vlib_main_t * vm,
+ vnet_main_t * vnm,
+ u32 sw_if_index,
+ const ip6_address_t * addr);
+
+extern void ip6_neighbor_probe_dst (const ip_adjacency_t * adj,
+ const ip6_address_t * dst);
+
+always_inline vlib_buffer_t *
+ip6_neighbor_probe (vlib_main_t * vm,
+ vnet_main_t * vnm,
+ const ip_adjacency_t * adj,
+ const ip6_address_t * src, const ip6_address_t * dst)
+{
+ icmp6_neighbor_solicitation_header_t *h0;
+ vnet_hw_interface_t *hw_if0;
+ vlib_buffer_t *b0;
+ int bogus_length;
+ u32 bi0 = 0;
+
+ h0 = vlib_packet_template_get_packet
+ (vm, &ip6_neighbor_packet_template, &bi0);
+ if (!h0)
+ return NULL;;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ hw_if0 = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
+
+ /*
+ * Destination address is a solicited node multicast address.
+ * We need to fill in
+ * the low 24 bits with low 24 bits of target's address.
+ */
+ h0->ip.src_address = *src;
+ h0->ip.dst_address.as_u8[13] = dst->as_u8[13];
+ h0->ip.dst_address.as_u8[14] = dst->as_u8[14];
+ h0->ip.dst_address.as_u8[15] = dst->as_u8[15];
+
+ h0->neighbor.target_address = *dst;
+
+ clib_memcpy (h0->link_layer_option.ethernet_address,
+ hw_if0->hw_address, vec_len (hw_if0->hw_address));
+
+ /* $$$$ appears we need this; why is the checksum non-zero? */
+ h0->neighbor.icmp.checksum = 0;
+ h0->neighbor.icmp.checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length);
+
+ ASSERT (bogus_length == 0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
+
+ /* Use the link's mcast adj to ship the packet */
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
+ ip6_link_get_mcast_adj (adj->rewrite_header.sw_if_index);
+ adj = adj_get (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+
+ b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+ {
+ vlib_frame_t *f = vlib_get_frame_to_node (vm, adj->ia_node_index);
+ u32 *to_next = vlib_frame_vector_args (f);
+ to_next[0] = bi0;
+ f->n_vectors = 1;
+ vlib_put_frame_to_node (vm, adj->ia_node_index, f);
+ }
+
+ return b0;
+}
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */