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authorMohsin Kazmi <sykazmi@cisco.com>2021-04-06 19:24:00 +0200
committerNeale Ranns <neale@graphiant.com>2021-07-16 07:03:30 +0000
commitb31ddb5bb14f6975afe912bc07275a9a8e0aa29f (patch)
tree47bb6812bb8affaa5eb42864d88c1cfda41aef47 /src/vnet/ip6-nd/ip6_nd_inline.h
parent9f2d8bbfa2a6eea255c76de4230e28e91210809a (diff)
ip6-nd: refactor neighbour advertisement code
Type: refactor Refactor neighbour advertisement code into inline function to be used solely in feature nodes. Change-Id: I1e84c54f9807b4e3d90c37526c78a7afcb0ba087 Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/ip6-nd/ip6_nd_inline.h')
-rw-r--r--src/vnet/ip6-nd/ip6_nd_inline.h101
1 files changed, 101 insertions, 0 deletions
diff --git a/src/vnet/ip6-nd/ip6_nd_inline.h b/src/vnet/ip6-nd/ip6_nd_inline.h
new file mode 100644
index 00000000000..ad0c3a3a79b
--- /dev/null
+++ b/src/vnet/ip6-nd/ip6_nd_inline.h
@@ -0,0 +1,101 @@
+/*
+ *
+ * ip6_nd_inline.h: ip6 neighbor discovery inline
+ *
+ * Copyright (c) 2021 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_ND_INLINE_H__
+#define __IP6_ND_INLINE_H__
+
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/icmp46_packet.h>
+#include <vnet/ip/ip6.h>
+
+typedef enum
+{
+ ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
+ ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
+ ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
+} icmp6_neighbor_solicitation_or_advertisement_next_t;
+
+static_always_inline void
+icmp6_send_neighbor_advertisement (
+ vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6_h,
+ icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nsa,
+ icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+ *icmp6_nd_ell_addr,
+ u32 sw_if_index0)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ vnet_sw_interface_t *sw_if;
+ ethernet_interface_t *eth_if;
+ ethernet_header_t *eth;
+ int bogus_length;
+
+ /* dst address is either source address or the all-nodes mcast addr */
+ if (!ip6_address_is_unspecified (&ip6_h->src_address))
+ ip6_h->dst_address = ip6_h->src_address;
+ else
+ ip6_set_reserved_multicast_address (&ip6_h->dst_address,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_hosts);
+
+ ip6_h->src_address = icmp6_nsa->target_address;
+ ip6_h->hop_limit = 255;
+ icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
+
+ sw_if = vnet_get_sup_sw_interface (vnm, sw_if_index0);
+ ASSERT (sw_if->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
+ eth_if = ethernet_get_interface (&ethernet_main, sw_if->hw_if_index);
+ if (eth_if && icmp6_nd_ell_addr)
+ {
+ clib_memcpy (icmp6_nd_ell_addr->ethernet_address, &eth_if->address, 6);
+ icmp6_nd_ell_addr->header.type =
+ ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
+ }
+
+ icmp6_nsa->advertisement_flags =
+ clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
+ ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
+
+ icmp6_nsa->icmp.checksum = 0;
+ icmp6_nsa->icmp.checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6_h, &bogus_length);
+ ASSERT (bogus_length == 0);
+
+ /* Reuse current MAC header, copy SMAC to DMAC and
+ * interface MAC to SMAC */
+ vlib_buffer_advance (b, -ethernet_buffer_header_size (b));
+ eth = vlib_buffer_get_current (b);
+ clib_memcpy (eth->dst_address, eth->src_address, 6);
+ if (eth_if)
+ clib_memcpy (eth->src_address, &eth_if->address, 6);
+
+ /* Setup input and output sw_if_index for packet */
+ ASSERT (vnet_buffer (b)->sw_if_index[VLIB_RX] == sw_if_index0);
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index0;
+ vnet_buffer (b)->sw_if_index[VLIB_RX] =
+ vnet_main.local_interface_sw_if_index;
+}
+
+#endif /* included_ip6_nd_inline_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */