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© 2016 FD.io a Linux Foundation Collaborative Project. All Rights Reserved.
Linux Foundation is a registered trademark of The Linux Foundation. Linux is a registered trademark of Linus Torvalds.
Please see our
privacy policy and
/*
* Copyright (c) 2018 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/ethernet/ethernet.h>
#include <dhcp/dhcp6_packet.h>
#include <dhcp/dhcp6_client_common_dp.h>
#include <dhcp/dhcp6_ia_na_client_dp.h>
#include <dhcp/dhcp6_pd_client_dp.h>
#include <dhcp/dhcp6_packet.h>
#include <vnet/udp/udp_local.h>
#include <vnet/udp/udp_packet.h>
dhcp6_client_common_main_t dhcp6_client_common_main;
dhcpv6_duid_ll_string_t client_duid;
u32
server_index_get_or_create (u8 * data, u16 len)
{
dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main;
u32 i;
server_id_t *se;
server_id_t new_se;
for (i = 0; i < vec_len (ccm->server_ids); i++)
{
se = &ccm->server_ids[i];
if (se->len == len && 0 == memcmp (se->data, data, len))
return i;
}
new_se.len = len;
new_se.data = 0;
vec_validate (new_se.data, len - 1);
memcpy (new_se.data, data, len);
vec_add1 (ccm->server_ids, new_se);
return vec_len (ccm->server_ids) - 1;
}
static void
generate_client_duid (void)
{
client_duid.duid_type = clib_host_to_net_u16 (DHCPV6_DUID_LL);
client_duid.hardware_type = clib_host_to_net_u16 (1);
vnet_main_t *vnm = vnet_get_main ();
vnet_interface_main_t *im = &vnm->interface_main;
vnet_hw_interface_t *hi;
ethernet_interface_t *eth_if = 0;
/* *INDENT-OFF* */
pool_foreach (hi, im->hw_interfaces)
{
eth_if = ethernet_get_interface (ðernet_main, hi->hw_if_index);
if (eth_if)
break;
}
/* *INDENT-ON* */
if (eth_if)
clib_memcpy (client_duid.lla, ð_if->address, 6);
else
{
clib_warning ("Failed to find any Ethernet interface, "
"setting DHCPv6 DUID link-layer address to random value");
u32 seed = random_default_seed ();
random_u32 (&seed);
client_duid.lla[0] = 0xc2; /* locally administered unicast */
client_duid.lla[1] = 0x18;
client_duid.lla[2] = 0x44;
client_duid.lla[3] = random_u32 (&seed);
client_duid.lla[4] = random_u32 (&seed);
client_duid.lla[5] = random_u32 (&seed);
}
}
#define foreach_dhcpv6_client \
_(DROP, "error-drop") \
_(LOOKUP, "ip6-lookup")
typedef enum
{
#define _(sym,str) DHCPV6_CLIENT_NEXT_##sym,
foreach_dhcpv6_client
#undef _
DHCPV6_CLIENT_N_NEXT,
} dhcpv6_client_next_t;
/**
* per-packet trace data
*/
typedef struct dhcpv6_client_trace_t_
{
} dhcpv6_client_trace_t;
static u8 *
format_dhcpv6_client_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
//dhcpv6_client_trace_t *t = va_arg (*args, dhcpv6_client_trace_t *);
s = format (s, "nothing");
return s;
}
static uword
dhcpv6_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
dhcp6_ia_na_client_main_t *icm = &dhcp6_ia_na_client_main;
dhcp6_pd_client_main_t *pcm = &dhcp6_pd_client_main;
dhcpv6_client_next_t next_index;
u32 n_left_from, *from, *to_next;
next_index = 0;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
ip6_header_t *ip0;
u32 options_length;
dhcpv6_header_t *dhcpv60;
dhcpv6_option_t *option;
vlib_buffer_t *b0;
dhcp6_report_common_t report;
dhcp6_address_info_t *addresses = 0;
dhcp6_prefix_info_t *prefixes = 0;
u32 next0 = DHCPV6_CLIENT_NEXT_DROP;
u32 bi0;
u32 xid;
u32 sw_if_index;
u32 iaid;
u8 client_id_present = 0;
u8 discard = 0;
u8 is_pd_packet = 0;
dhcp6_ia_na_client_state_t *ia_na_client_state = NULL;
dhcp6_pd_client_state_t *pd_client_state = NULL;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
dhcpv60 = vlib_buffer_get_current (b0);
ip0 = (void *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
u32 dhcpv6_ip6_payload_offset =
(u8 *) dhcpv60 - ((u8 *) ip0 + sizeof (*ip0));
options_length =
clib_net_to_host_u16 (ip0->payload_length) -
dhcpv6_ip6_payload_offset - sizeof (*dhcpv60);
clib_memset (&report, 0, sizeof (report));
sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
if (sw_if_index >= vec_len (icm->client_state_by_sw_if_index))
ia_na_client_state = 0;
else
ia_na_client_state =
&icm->client_state_by_sw_if_index[sw_if_index];
if (sw_if_index >= vec_len (pcm->client_state_by_sw_if_index))
pd_client_state = 0;
else
pd_client_state = &pcm->client_state_by_sw_if_index[sw_if_index];
xid =
(dhcpv60->xid[0] << 16) + (dhcpv60->xid[1] << 8) +
dhcpv60->xid[2];
if (ia_na_client_state && ia_na_client_state->transaction_id == xid)
is_pd_packet = 0;
else if (pd_client_state && pd_client_state->transaction_id == xid)
is_pd_packet = 1;
else
{
clib_warning
("Received DHCPv6 message with wrong Transaction ID");
discard = 1;
}
report.sw_if_index = sw_if_index;
report.msg_type = dhcpv60->msg_type;
report.server_index = ~0;
switch (dhcpv60->msg_type)
{
case DHCPV6_MSG_ADVERTISE:
case DHCPV6_MSG_REPLY:
option = (dhcpv6_option_t *) (dhcpv60 + 1);
while (options_length > 0)
{
if (options_length <
clib_net_to_host_u16 (option->length) +
sizeof (*option))
{
clib_warning
("remaining payload length < option length (%d < %d)",
options_length,
clib_net_to_host_u16 (option->length) +
sizeof (*option));
break;
}
u16 oo = clib_net_to_host_u16 (option->option);
if (oo == DHCPV6_OPTION_IA_NA || oo == DHCPV6_OPTION_IA_PD)
{
u8 discard_option = 0;
dhcpv6_ia_header_t *ia_header = (void *) option;
iaid = clib_net_to_host_u32 (ia_header->iaid);
u32 T1 = clib_net_to_host_u32 (ia_header->t1);
u32 T2 = clib_net_to_host_u32 (ia_header->t2);
if (iaid != DHCPV6_CLIENT_IAID)
discard_option = 1;
if (T1 != 0 && T2 != 0 && T1 > T2)
discard_option = 1;
if (!discard_option)
{
report.T1 = T1;
report.T2 = T2;
}
dhcpv6_option_t *inner_option =
(void *) ia_header->data;
u16 inner_options_length =
clib_net_to_host_u16 (option->length) -
(sizeof (*ia_header) - sizeof (dhcpv6_option_t));
while (inner_options_length > 0)
{
u16 inner_oo =
clib_net_to_host_u16 (inner_option->option);
if (discard_option)
;
else if (inner_oo == DHCPV6_OPTION_IAADDR)
{
dhcpv6_ia_opt_addr_t *iaaddr =
(void *) inner_option;
u32 n_addresses = vec_len (addresses);
vec_validate (addresses, n_addresses);
dhcp6_address_info_t *address_info =
&addresses[n_addresses];
address_info->preferred_time =
clib_net_to_host_u32 (iaaddr->preferred);
address_info->valid_time =
clib_net_to_host_u32 (iaaddr->valid);
address_info->address = iaaddr->addr;
}
else if (inner_oo == DHCPV6_OPTION_IAPREFIX)
{
dhcpv6_ia_opt_pd_t *iaprefix =
(void *) inner_option;
u32 n_prefixes = vec_len (prefixes);
vec_validate (prefixes, n_prefixes);
dhcp6_prefix_info_t *prefix_info =
&prefixes[n_prefixes];
prefix_info->preferred_time =
clib_net_to_host_u32 (iaprefix->preferred);
prefix_info->valid_time =
clib_net_to_host_u32 (iaprefix->valid);
prefix_info->prefix_length = iaprefix->prefix;
prefix_info->prefix = iaprefix->addr;
}
else if (inner_oo == DHCPV6_OPTION_STATUS_CODE)
{
dhcpv6_status_code_t *sc =
(void *) inner_option;
report.inner_status_code =
clib_net_to_host_u16 (sc->status_code);
}
inner_options_length -=
sizeof (*inner_option) +
clib_net_to_host_u16 (inner_option->length);
inner_option =
(void *) ((u8 *) inner_option +
sizeof (*inner_option) +
clib_net_to_host_u16
(inner_option->length));
}
}
else if (oo == DHCPV6_OPTION_CLIENTID)
{
if (client_id_present)
{
clib_warning
("Duplicate Client ID in received DHVPv6 message");
discard = 1;
}
else
{
u16 len = clib_net_to_host_u16 (option->length);
client_id_present = 1;
if (len != CLIENT_DUID_LENGTH ||
0 != memcmp (option->data,
client_duid.bin_string,
CLIENT_DUID_LENGTH))
{
clib_warning
("Unrecognized client DUID inside received DHVPv6 message");
discard = 1;
}
}
}
else if (oo == DHCPV6_OPTION_SERVERID)
{
if (report.server_index != ~0)
{
clib_warning
("Duplicate Server ID in received DHVPv6 message");
discard = 1;
}
else
{
u16 ol = clib_net_to_host_u16 (option->length);
if (ol - 2 /* 2 byte DUID type code */ > 128)
{
clib_warning
("Server DUID (without type code) is longer than 128 octets");
discard = 1;
}
else
{
report.server_index =
server_index_get_or_create (option->data, ol);
}
}
}
else if (oo == DHCPV6_OPTION_PREFERENCE)
{
report.preference = option->data[0];
}
else if (oo == DHCPV6_OPTION_STATUS_CODE)
{
dhcpv6_status_code_t *sc = (void *) option;
report.status_code =
clib_net_to_host_u16 (sc->status_code);
}
options_length -=
sizeof (*option) + clib_net_to_host_u16 (option->length);
option =
(void *) ((u8 *) option + sizeof (*option) +
clib_net_to_host_u16 (option->length));
}
if (!client_id_present)
{
clib_warning
("Missing Client ID in received DHVPv6 message");
discard = 1;
}
if (report.server_index == ~0)
{
clib_warning
("Missing Server ID in received DHVPv6 message");
discard = 1;
}
if (!discard)
{
if (!is_pd_packet)
{
address_report_t r;
r.body = report;
r.n_addresses = vec_len (addresses);
r.addresses = addresses;
dhcp6_publish_report (&r);
/* We just gave addresses to another process! */
addresses = 0;
}
else
{
prefix_report_t r;
r.body = report;
r.n_prefixes = vec_len (prefixes);
r.prefixes = prefixes;
dhcp6_pd_publish_report (&r);
/* We just gave prefixes to another process! */
prefixes = 0;
}
}
vec_free (addresses);
vec_free (prefixes);
break;
default:
break;
}
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
dhcpv6_client_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
}
/* verify speculative enqueue, maybe switch current next frame */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dhcpv6_client_node, static) = {
.function = dhcpv6_client_node_fn,
.name = "dhcpv6-client",
.vector_size = sizeof (u32),
.n_errors = 0,
.n_next_nodes = DHCPV6_CLIENT_N_NEXT,
.next_nodes = {
#define _(s,n) [DHCPV6_CLIENT_NEXT_##s] = n,
foreach_dhcpv6_client
#undef _
},
.format_trace = format_dhcpv6_client_trace,
};
/* *INDENT-ON* */
void
dhcp6_clients_enable_disable (u8 enable)
{
vlib_main_t *vm = vlib_get_main ();
if (enable)
{
if (client_duid.duid_type == 0)
generate_client_duid ();
udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
dhcpv6_client_node.index, 0 /* is_ip6 */ );
}
else
udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
0 /* is_ip6 */ );
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
© 2016 FD.io a Linux Foundation Collaborative Project. All Rights Reserved.
Linux Foundation is a registered trademark of The Linux Foundation. Linux is a registered trademark of Linus Torvalds.
Please see our privacy policy and terms of use