FD.io VPP  v21.01.1
Vector Packet Processing
ip6_neighbor.h
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1 /*
2  * ip/ip6_neighbor.h: IP6 NS transmit
3  *
4  * Copyright (c) 2019 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #ifndef __IP6_NEIGHBOR_H__
19 #define __IP6_NEIGHBOR_H__
20 
21 #include <vlib/vlib.h>
22 #include <vnet/ip/format.h>
23 #include <vnet/ip/ip6.h>
24 #include <vnet/ip/ip6_link.h>
25 #include <vnet/ip/icmp46_packet.h>
26 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/adj/adj_internal.h>
28 
29 /* Template used to generate IP6 neighbor solicitation packets. */
31 
33  vnet_main_t * vnm,
35  const ip6_address_t * addr);
36 
38  const ip6_address_t * dst);
39 
42  vnet_main_t * vnm,
44  const ip6_address_t * src, const ip6_address_t * dst)
45 {
46  icmp6_neighbor_solicitation_header_t *h0;
47  vnet_hw_interface_t *hw_if0;
48  const ip_adjacency_t *adj;
49  vlib_buffer_t *b0;
50  int bogus_length;
51  u32 bi0 = 0;
52 
54  (vm, &ip6_neighbor_packet_template, &bi0);
55  if (!h0)
56  return NULL;
57 
58  /* if the interface has been disabled for ip6, later steps to retrieve
59  * an adjacency will result in a segv.
60  */
61  if (!ip6_link_is_enabled (sw_if_index))
62  return NULL;
63 
64  b0 = vlib_get_buffer (vm, bi0);
65 
66  hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index);
67 
68  /*
69  * Destination address is a solicited node multicast address.
70  * We need to fill in
71  * the low 24 bits with low 24 bits of target's address.
72  */
73  h0->ip.src_address = *src;
74  h0->ip.dst_address.as_u8[13] = dst->as_u8[13];
75  h0->ip.dst_address.as_u8[14] = dst->as_u8[14];
76  h0->ip.dst_address.as_u8[15] = dst->as_u8[15];
77 
78  h0->neighbor.target_address = *dst;
79 
80  clib_memcpy (h0->link_layer_option.ethernet_address,
81  hw_if0->hw_address, vec_len (hw_if0->hw_address));
82 
83  /* $$$$ appears we need this; why is the checksum non-zero? */
84  h0->neighbor.icmp.checksum = 0;
85  h0->neighbor.icmp.checksum =
86  ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length);
87 
88  ASSERT (bogus_length == 0);
90 
91  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
92 
93  /* Use the link's mcast adj to ship the packet */
94  vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
95  ip6_link_get_mcast_adj (sw_if_index);
96  adj = adj_get (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
97 
98  b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
99 
100  {
102  u32 *to_next = vlib_frame_vector_args (f);
103  to_next[0] = bi0;
104  f->n_vectors = 1;
106  }
107 
108  return b0;
109 }
110 
111 #endif
112 
113 /*
114  * fd.io coding-style-patch-verification: ON
115  *
116  * Local Variables:
117  * eval: (c-set-style "gnu")
118  * End:
119  */
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
static 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)
Definition: ip6_neighbor.h:41
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
IP unicast adjacency.
Definition: adj.h:235
vl_api_address_t src
Definition: gre.api:54
vlib_main_t * vm
Definition: in2out_ed.c:1580
void ip6_neighbor_probe_dst(u32 sw_if_index, const ip6_address_t *dst)
Definition: ip6_neighbor.c:26
vhost_vring_addr_t addr
Definition: vhost_user.h:111
#define clib_memcpy(d, s, n)
Definition: string.h:180
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:467
void * vlib_packet_template_get_packet(vlib_main_t *vm, vlib_packet_template_t *t, u32 *bi_result)
Definition: buffer.c:400
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:182
unsigned int u32
Definition: types.h:88
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:216
u32 ia_node_index
The VLIB node in which this adj is used to forward packets.
Definition: adj.h:330
#define always_inline
Definition: ipsec.h:28
vl_api_address_t dst
Definition: gre.api:55
u16 n_vectors
Definition: node.h:397
u16 ip6_tcp_udp_icmp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip6_header_t *ip0, int *bogus_lengthp)
Definition: ip6_forward.c:1099
#define ASSERT(truth)
Definition: defs.h:47
vlib_packet_template_t ip6_neighbor_packet_template
Definition: ip6_neighbor.c:295
vl_api_address_t ip
Definition: l2.api:501
void ip6_neighbor_advertise(vlib_main_t *vm, vnet_main_t *vnm, u32 sw_if_index, const ip6_address_t *addr)
Definition: ip6_neighbor.c:36
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b)
Definition: buffer.h:497
VLIB buffer representation.
Definition: buffer.h:102
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:297
#define vnet_buffer(b)
Definition: buffer.h:417
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
vl_api_interface_index_t sw_if_index
Definition: wireguard.api:34