/* * 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 (u32 sw_if_index, const ip6_address_t * dst); always_inline vlib_buffer_t * ip6_neighbor_probe (vlib_main_t * vm, vnet_main_t * vnm, u32 sw_if_index, const ip6_address_t * src, const ip6_address_t * dst) { icmp6_neighbor_solicitation_header_t *h0; vnet_hw_interface_t *hw_if0; const ip_adjacency_t *adj; 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; /* if the interface has been disabled for ip6, later steps to retrieve * an adjacency will result in a segv. */ if (!ip6_link_is_enabled (sw_if_index)) return NULL; b0 = vlib_get_buffer (vm, bi0); hw_if0 = vnet_get_sup_hw_interface (vnm, 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] = 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 (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: */