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dd298e804a25dbebc9e284b3b2d0dfd9bf674ad8
vpp/src/plugins/dhcp/dhcp6_proxy_node.c
Damjan Marion dd298e804a misc: fix issues reported by clang-15 
Type: improvement

Change-Id: I3fbbda0378b72843ecd39a7e8592dedc9757793a
Signed-off-by: Damjan Marion <dmarion@me.com>
2022-10-12 16:04:13 +02:00

1213 lines
35 KiB
C
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/*
* dhcp6_proxy_node.c: dhcpv6 proxy node processing
*
* Copyright (c) 2013 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 <vlib/vlib.h>
#include <dhcp/dhcp_proxy.h>
#include <dhcp/dhcp6_packet.h>
#include <vnet/mfib/mfib_table.h>
#include <vnet/mfib/ip6_mfib.h>
#include <vnet/fib/fib.h>
static char *dhcpv6_proxy_error_strings[] = {
#define dhcpv6_proxy_error(n,s) s,
#include <dhcp/dhcp6_proxy_error.def>
#undef dhcpv6_proxy_error
};
#define foreach_dhcpv6_proxy_to_server_input_next \
_ (DROP, "error-drop") \
_ (LOOKUP, "ip6-lookup") \
_ (SEND_TO_CLIENT, "dhcpv6-proxy-to-client")
typedef enum
{
#define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s,
foreach_dhcpv6_proxy_to_server_input_next
#undef _
DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
} dhcpv6_proxy_to_server_input_next_t;
typedef struct
{
/* 0 => to server, 1 => to client */
int which;
u8 packet_data[64];
u32 error;
u32 sw_if_index;
u32 original_sw_if_index;
} dhcpv6_proxy_trace_t;
static vlib_node_registration_t dhcpv6_proxy_to_server_node;
static vlib_node_registration_t dhcpv6_proxy_to_client_node;
/* all DHCP servers address */
static ip6_address_t all_dhcpv6_server_address;
static ip6_address_t all_dhcpv6_server_relay_agent_address;
static u8 *
format_dhcpv6_proxy_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_proxy_trace_t *t = va_arg (*args, dhcpv6_proxy_trace_t *);
if (t->which == 0)
s = format (s, "DHCPV6 proxy: sent to server %U",
format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
else
s = format (s, "DHCPV6 proxy: sent to client from %U",
format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
if (t->error != (u32) ~ 0)
s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]);
s = format (s, " original_sw_if_index: %d, sw_if_index: %d\n",
t->original_sw_if_index, t->sw_if_index);
return s;
}
static u8 *
format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args)
{
dhcpv6_header_t *h = va_arg (*args, dhcpv6_header_t *);
u32 max_header_bytes = va_arg (*args, u32);
u32 header_bytes;
header_bytes = sizeof (h[0]);
if (max_header_bytes != 0 && header_bytes > max_header_bytes)
return format (s, "dhcpv6 header truncated");
s = format (s, "DHCPV6 Proxy");
return s;
}
/* get first interface address */
static ip6_address_t *
ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index)
{
ip_lookup_main_t *lm = &im->lookup_main;
ip_interface_address_t *ia = 0;
ip6_address_t *result = 0;
/* *INDENT-OFF* */
foreach_ip_interface_address (lm, ia, sw_if_index,
1 /* honor unnumbered */,
({
ip6_address_t * a = ip_interface_address_get_address (lm, ia);
if ((a->as_u8[0] & 0xe0) == 0x20 ||
(a->as_u8[0] & 0xfe) == 0xfc) {
result = a;
break;
}
}));
/* *INDENT-ON* */
return result;
}
static inline void
copy_ip6_address (ip6_address_t * dst, ip6_address_t * src)
{
dst->as_u64[0] = src->as_u64[0];
dst->as_u64[1] = src->as_u64[1];
}
static uword
dhcpv6_proxy_to_server_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
u32 pkts_to_server = 0, pkts_to_client = 0;
u32 pkts_no_interface_address = 0;
u32 pkts_no_src_address = 0;
u32 pkts_wrong_msg_type = 0;
u32 pkts_too_big = 0;
ip6_main_t *im = &ip6_main;
ip6_address_t *src;
int bogus_length;
dhcp_proxy_t *proxy;
dhcp_server_t *server;
u32 rx_fib_idx = 0, server_fib_idx = 0;
next_index = node->cached_next_index;
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)
{
vnet_main_t *vnm = vnet_get_main ();
u32 sw_if_index = 0;
u32 rx_sw_if_index = 0;
vnet_sw_interface_t *swif;
u32 bi0;
vlib_buffer_t *b0;
udp_header_t *u0, *u1;
dhcpv6_header_t *h0; // client msg hdr
ip6_header_t *ip0, *ip1;
ip6_address_t _ia0, *ia0 = &_ia0;
u32 next0;
u32 error0 = (u32) ~ 0;
dhcpv6_option_t *fwd_opt;
dhcpv6_relay_hdr_t *r1;
u16 len;
dhcpv6_int_id_t *id1;
dhcpv6_vss_t *vss1;
dhcpv6_client_mac_t *cmac; // client mac
ethernet_header_t *e_h0;
u8 client_src_mac[6];
dhcp_vss_t *vss;
u8 is_solicit = 0;
bi0 = from[0];
from += 1;
n_left_from -= 1;
b0 = vlib_get_buffer (vm, bi0);
h0 = vlib_buffer_get_current (b0);
/*
* udp_local hands us the DHCPV6 header.
*/
u0 = (void *) h0 - (sizeof (*u0));
ip0 = (void *) u0 - (sizeof (*ip0));
e_h0 = (void *) ip0 - ethernet_buffer_header_size (b0);
clib_memcpy (client_src_mac, e_h0->src_address, 6);
switch (h0->msg_type)
{
case DHCPV6_MSG_SOLICIT:
case DHCPV6_MSG_REQUEST:
case DHCPV6_MSG_CONFIRM:
case DHCPV6_MSG_RENEW:
case DHCPV6_MSG_REBIND:
case DHCPV6_MSG_RELEASE:
case DHCPV6_MSG_DECLINE:
case DHCPV6_MSG_INFORMATION_REQUEST:
case DHCPV6_MSG_RELAY_FORW:
/* send to server */
break;
case DHCPV6_MSG_RELAY_REPL:
/* send to client */
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
error0 = 0;
pkts_to_client++;
goto do_enqueue;
default:
/* drop the packet */
pkts_wrong_msg_type++;
error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
goto do_trace;
}
/* Send to DHCPV6 server via the configured FIB */
rx_sw_if_index = sw_if_index =
vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_idx = im->mfib_index_by_sw_if_index[rx_sw_if_index];
proxy = dhcp_get_proxy (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
if (PREDICT_FALSE (NULL == proxy))
{
error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
goto do_trace;
}
server = &proxy->dhcp_servers[0];
server_fib_idx = server->server_fib_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = server_fib_idx;
/* relay-option header pointer */
vlib_buffer_advance (b0, -(sizeof (*fwd_opt)));
fwd_opt = vlib_buffer_get_current (b0);
/* relay message header pointer */
vlib_buffer_advance (b0, -(sizeof (*r1)));
r1 = vlib_buffer_get_current (b0);
vlib_buffer_advance (b0, -(sizeof (*u1)));
u1 = vlib_buffer_get_current (b0);
vlib_buffer_advance (b0, -(sizeof (*ip1)));
ip1 = vlib_buffer_get_current (b0);
/* fill in all that rubbish... */
len = clib_net_to_host_u16 (u0->length) - sizeof (udp_header_t);
copy_ip6_address (&r1->peer_addr, &ip0->src_address);
r1->msg_type = DHCPV6_MSG_RELAY_FORW;
fwd_opt->length = clib_host_to_net_u16 (len);
fwd_opt->option = clib_host_to_net_u16 (DHCPV6_OPTION_RELAY_MSG);
r1->hop_count++;
r1->hop_count =
(h0->msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
if (PREDICT_FALSE (r1->hop_count >= HOP_COUNT_LIMIT))
{
error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
goto do_trace;
}
/* If relay-fwd and src address is site or global unicast address */
if (h0->msg_type == DHCPV6_MSG_RELAY_FORW &&
((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
(ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
{
/* Set link address to zero */
r1->link_addr.as_u64[0] = 0;
r1->link_addr.as_u64[1] = 0;
goto link_address_set;
}
/* if receiving interface is unnumbered, use receiving interface
* IP address as link address, otherwise use the loopback interface
* IP address as link address.
*/
swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
sw_if_index = swif->unnumbered_sw_if_index;
ia0 =
ip6_interface_first_global_or_site_address (&ip6_main,
sw_if_index);
if (ia0 == 0)
{
error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_no_interface_address++;
goto do_trace;
}
copy_ip6_address (&r1->link_addr, ia0);
link_address_set:
if ((b0->current_data + b0->current_length + sizeof (*id1) +
sizeof (*vss1) + sizeof (*cmac)) >
vlib_buffer_get_default_data_size (vm))
{
error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_too_big++;
goto do_trace;
}
id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
b0->current_length += (sizeof (*id1));
id1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_INTERFACE_ID);
id1->opt.length = clib_host_to_net_u16 (sizeof (rx_sw_if_index));
id1->int_idx = clib_host_to_net_u32 (rx_sw_if_index);
u1->length = 0;
if (h0->msg_type != DHCPV6_MSG_RELAY_FORW)
{
cmac =
(dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
b0->current_length += (sizeof (*cmac));
cmac->opt.length = clib_host_to_net_u16 (sizeof (*cmac) -
sizeof (cmac->opt));
cmac->opt.option =
clib_host_to_net_u16
(DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
cmac->link_type = clib_host_to_net_u16 (1); /* ethernet */
clib_memcpy (cmac->data, client_src_mac, 6);
u1->length += sizeof (*cmac);
}
vss = dhcp_get_vss_info (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
if (vss)
{
u16 id_len; /* length of VPN ID */
u16 type_len = sizeof (vss1->vss_type);
vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
vss1->vss_type = vss->vss_type;
if (vss->vss_type == VSS_TYPE_VPN_ID)
{
id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */
memcpy (vss1->data, vss->vpn_id, id_len);
}
else if (vss->vss_type == VSS_TYPE_ASCII)
{
id_len = vec_len (vss->vpn_ascii_id);
memcpy (vss1->data, vss->vpn_ascii_id, id_len);
}
else /* must be VSS_TYPE_DEFAULT, no VPN ID */
id_len = 0;
vss1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_VSS);
vss1->opt.length = clib_host_to_net_u16 (type_len + id_len);
u1->length += type_len + id_len + sizeof (vss1->opt);
b0->current_length += type_len + id_len + sizeof (vss1->opt);
}
pkts_to_server++;
u1->checksum = 0;
u1->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_client);
u1->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_server);
u1->length =
clib_host_to_net_u16 (clib_net_to_host_u16 (fwd_opt->length) +
sizeof (*r1) + sizeof (*fwd_opt) +
sizeof (*u1) + sizeof (*id1) + u1->length);
clib_memset (ip1, 0, sizeof (*ip1));
ip1->ip_version_traffic_class_and_flow_label = 0x60;
ip1->payload_length = u1->length;
ip1->protocol = PROTO_UDP;
ip1->hop_limit = HOP_COUNT_LIMIT;
src = ((server->dhcp_server.ip6.as_u64[0] ||
server->dhcp_server.ip6.as_u64[1]) ?
&server->dhcp_server.ip6 : &all_dhcpv6_server_address);
copy_ip6_address (&ip1->dst_address, src);
ia0 = ip6_interface_first_global_or_site_address
(&ip6_main, vnet_buffer (b0)->sw_if_index[VLIB_RX]);
src = (proxy->dhcp_src_address.ip6.as_u64[0] ||
proxy->dhcp_src_address.ip6.as_u64[1]) ?
&proxy->dhcp_src_address.ip6 : ia0;
if (ia0 == 0)
{
error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_no_src_address++;
goto do_trace;
}
copy_ip6_address (&ip1->src_address, src);
u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
&bogus_length);
ASSERT (bogus_length == 0);
next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
is_solicit = (DHCPV6_MSG_SOLICIT == h0->msg_type);
/*
* If we have multiple servers configured and this is the
* client's discover message, then send copies to each of
* those servers
*/
if (is_solicit && vec_len (proxy->dhcp_servers) > 1)
{
u32 ii;
for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
{
vlib_buffer_t *c0;
u32 ci0;
c0 = vlib_buffer_copy (vm, b0);
if (c0 == NULL)
{
vlib_node_increment_counter
(vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_ALLOC_FAIL, 1);
continue;
}
ci0 = vlib_get_buffer_index (vm, c0);
server = &proxy->dhcp_servers[ii];
ip0 = vlib_buffer_get_current (c0);
src = ((server->dhcp_server.ip6.as_u64[0] ||
server->dhcp_server.ip6.as_u64[1]) ?
&server->dhcp_server.ip6 :
&all_dhcpv6_server_address);
copy_ip6_address (&ip1->dst_address, src);
to_next[0] = ci0;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
ci0, next0);
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
dhcpv6_proxy_trace_t *tr;
tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
tr->which = 0; /* to server */
tr->error = error0;
tr->original_sw_if_index = rx_sw_if_index;
tr->sw_if_index = sw_if_index;
if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
copy_ip6_address ((ip6_address_t *) &
tr->packet_data[0],
&server->dhcp_server.ip6);
}
if (PREDICT_FALSE (0 == n_left_to_next))
{
vlib_put_next_frame (vm, node, next_index,
n_left_to_next);
vlib_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
}
}
}
do_trace:
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
b0, sizeof (*tr));
tr->which = 0; /* to server */
tr->error = error0;
tr->original_sw_if_index = rx_sw_if_index;
tr->sw_if_index = sw_if_index;
if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
copy_ip6_address ((ip6_address_t *) & tr->packet_data[0],
&server->dhcp_server.ip6);
}
do_enqueue:
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
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);
}
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
pkts_to_client);
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
pkts_to_server);
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
pkts_no_interface_address);
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
pkts_wrong_msg_type);
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
pkts_no_src_address);
vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
DHCPV6_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
return from_frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = {
.function = dhcpv6_proxy_to_server_input,
.name = "dhcpv6-proxy-to-server",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = DHCPV6_PROXY_N_ERROR,
.error_strings = dhcpv6_proxy_error_strings,
.n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
foreach_dhcpv6_proxy_to_server_input_next
#undef _
},
.format_buffer = format_dhcpv6_proxy_header_with_length,
.format_trace = format_dhcpv6_proxy_trace,
#if 0
.unformat_buffer = unformat_dhcpv6_proxy_header,
#endif
};
/* *INDENT-ON* */
static uword
dhcpv6_proxy_to_client_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, *from;
ethernet_main_t *em = vnet_get_ethernet_main ();
dhcp_proxy_main_t *dm = &dhcp_proxy_main;
dhcp_proxy_t *proxy;
dhcp_server_t *server;
vnet_main_t *vnm = vnet_get_main ();
int bogus_length;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
while (n_left_from > 0)
{
u32 bi0;
vlib_buffer_t *b0;
udp_header_t *u0, *u1 = 0;
dhcpv6_relay_hdr_t *h0;
ip6_header_t *ip1 = 0, *ip0;
ip6_address_t *ia0 = 0;
ip6_address_t client_address;
ethernet_interface_t *ei0;
ethernet_header_t *mac0;
vnet_hw_interface_t *hi0;
vlib_frame_t *f0;
u32 *to_next0;
u32 sw_if_index = ~0;
u32 original_sw_if_index = ~0;
vnet_sw_interface_t *si0;
u32 inner_vlan = (u32) ~ 0;
u32 outer_vlan = (u32) ~ 0;
u32 error0 = (u32) ~ 0;
vnet_sw_interface_t *swif;
dhcpv6_option_t *r0 = 0, *o;
u16 len = 0;
u8 interface_opt_flag = 0;
u8 relay_msg_opt_flag = 0;
ip6_main_t *im = &ip6_main;
u32 server_fib_idx, client_fib_idx;
bi0 = from[0];
from += 1;
n_left_from -= 1;
b0 = vlib_get_buffer (vm, bi0);
h0 = vlib_buffer_get_current (b0);
if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
{
error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
drop_packet:
vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
error0, 1);
f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
to_next0 = vlib_frame_vector_args (f0);
to_next0[0] = bi0;
f0->n_vectors = 1;
vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
goto do_trace;
}
/* hop count seems not need to be checked */
if (HOP_COUNT_LIMIT < h0->hop_count)
{
error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
goto drop_packet;
}
u0 = (void *) h0 - (sizeof (*u0));
ip0 = (void *) u0 - (sizeof (*ip0));
vlib_buffer_advance (b0, sizeof (*h0));
o = vlib_buffer_get_current (b0);
/* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
_and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
Currently assuming no other options need to be processed
The interface-ID is the FIB number we need
to track down the client-facing interface */
while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
{
if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16 (o->option))
{
interface_opt_flag = 1;
if (clib_net_to_host_u16 (o->length) == sizeof (sw_if_index))
sw_if_index =
clib_net_to_host_u32 (((dhcpv6_int_id_t *) o)->int_idx);
if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
{
error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
goto drop_packet;
}
}
if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16 (o->option))
{
relay_msg_opt_flag = 1;
r0 = vlib_buffer_get_current (b0);
}
if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
break;
vlib_buffer_advance (b0,
sizeof (*o) +
clib_net_to_host_u16 (o->length));
o =
(dhcpv6_option_t *) (((uword) o) +
clib_net_to_host_u16 (o->length) +
sizeof (*o));
}
if ((relay_msg_opt_flag == 0) || (r0 == 0))
{
error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
goto drop_packet;
}
if ((u32) ~ 0 == sw_if_index)
{
error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
goto drop_packet;
}
//Advance buffer to start of encapsulated DHCPv6 message
vlib_buffer_advance (b0, sizeof (*r0));
client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index];
proxy = dhcp_get_proxy (dm, client_fib_idx, FIB_PROTOCOL_IP6);
if (NULL == proxy)
{
error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
goto drop_packet;
}
server_fib_idx = im->fib_index_by_sw_if_index
[vnet_buffer (b0)->sw_if_index[VLIB_RX]];
vec_foreach (server, proxy->dhcp_servers)
{
if (server_fib_idx == server->server_fib_index &&
ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] &&
ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1])
{
goto server_found;
}
}
//drop packet if not from server with configured address or FIB
error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
goto drop_packet;
server_found:
vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
= sw_if_index;
swif = vnet_get_sw_interface (vnm, original_sw_if_index);
if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
sw_if_index = swif->unnumbered_sw_if_index;
/*
* udp_local hands us the DHCPV6 header, need udp hdr,
* ip hdr to relay to client
*/
vlib_buffer_advance (b0, -(sizeof (*u1)));
u1 = vlib_buffer_get_current (b0);
vlib_buffer_advance (b0, -(sizeof (*ip1)));
ip1 = vlib_buffer_get_current (b0);
copy_ip6_address (&client_address, &h0->peer_addr);
ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
if (ia0 == 0)
{
error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
goto drop_packet;
}
len = clib_net_to_host_u16 (r0->length);
clib_memset (ip1, 0, sizeof (*ip1));
copy_ip6_address (&ip1->dst_address, &client_address);
u1->checksum = 0;
u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
u1->length = clib_host_to_net_u16 (len + sizeof (udp_header_t));
ip1->ip_version_traffic_class_and_flow_label =
ip0->ip_version_traffic_class_and_flow_label & 0x00000fff;
ip1->payload_length = u1->length;
ip1->protocol = PROTO_UDP;
ip1->hop_limit = HOP_COUNT_LIMIT;
copy_ip6_address (&ip1->src_address, ia0);
u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
&bogus_length);
ASSERT (bogus_length == 0);
vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
{
if (si0->sub.eth.flags.one_tag == 1)
{
vlib_buffer_advance (b0, -4 /* space for 1 VLAN tag */ );
outer_vlan = (si0->sub.eth.outer_vlan_id << 16) | 0x86dd;
}
else if (si0->sub.eth.flags.two_tags == 1)
{
vlib_buffer_advance (b0, -8 /* space for 2 VLAN tag */ );
outer_vlan = (si0->sub.eth.outer_vlan_id << 16) | 0x8100;
inner_vlan = (si0->sub.eth.inner_vlan_id << 16) | 0x86dd;
}
}
mac0 = vlib_buffer_get_current (b0);
hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
clib_memcpy (mac0->src_address, &ei0->address,
sizeof (mac0->src_address));
clib_memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
if (si0->type == VNET_SW_INTERFACE_TYPE_SUB && outer_vlan != (u32) ~ 0)
{
mac0->type = (si0->sub.eth.flags.dot1ad == 1) ?
clib_net_to_host_u16 (0x88a8) : clib_net_to_host_u16 (0x8100);
u32 *vlan_tag = (u32 *) (mac0 + 1);
*vlan_tag = clib_host_to_net_u32 (outer_vlan);
if (inner_vlan != (u32) ~ 0)
{
u32 *inner_vlan_tag = (u32 *) (vlan_tag + 1);
*inner_vlan_tag = clib_host_to_net_u32 (inner_vlan);
}
}
else
{
mac0->type = clib_net_to_host_u16 (0x86dd);
}
/* $$$ consider adding a dynamic next to the graph node, for performance */
f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
to_next0 = vlib_frame_vector_args (f0);
to_next0[0] = bi0;
f0->n_vectors = 1;
vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
do_trace:
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
b0, sizeof (*tr));
tr->which = 1; /* to client */
if (ia0)
copy_ip6_address ((ip6_address_t *) tr->packet_data, ia0);
tr->error = error0;
tr->original_sw_if_index = original_sw_if_index;
tr->sw_if_index = sw_if_index;
}
}
return from_frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = {
.function = dhcpv6_proxy_to_client_input,
.name = "dhcpv6-proxy-to-client",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = DHCPV6_PROXY_N_ERROR,
.error_strings = dhcpv6_proxy_error_strings,
.format_buffer = format_dhcpv6_proxy_header_with_length,
.format_trace = format_dhcpv6_proxy_trace,
#if 0
.unformat_buffer = unformat_dhcpv6_proxy_header,
#endif
};
/* *INDENT-ON* */
static clib_error_t *
dhcp6_proxy_init (vlib_main_t * vm)
{
dhcp_proxy_main_t *dm = &dhcp_proxy_main;
vlib_node_t *error_drop_node;
error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
dm->error_drop_node_index = error_drop_node->index;
/* RFC says this is the dhcpv6 server address */
all_dhcpv6_server_address.as_u64[0] =
clib_host_to_net_u64 (0xFF05000000000000);
all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
/* RFC says this is the server and agent address */
all_dhcpv6_server_relay_agent_address.as_u64[0] =
clib_host_to_net_u64 (0xFF02000000000000);
all_dhcpv6_server_relay_agent_address.as_u64[1] =
clib_host_to_net_u64 (0x00010002);
return 0;
}
VLIB_INIT_FUNCTION (dhcp6_proxy_init);
int
dhcp6_proxy_set_server (ip46_address_t * addr,
ip46_address_t * src_addr,
u32 rx_table_id, u32 server_table_id, int is_del)
{
vlib_main_t *vm = vlib_get_main ();
u32 rx_fib_index = 0;
int rc = 0;
const mfib_prefix_t all_dhcp_servers = {
.fp_len = 128,
.fp_proto = FIB_PROTOCOL_IP6,
.fp_grp_addr = {
.ip6 = all_dhcpv6_server_relay_agent_address,
}
};
if (ip46_address_is_zero (addr))
return VNET_API_ERROR_INVALID_DST_ADDRESS;
if (ip46_address_is_zero (src_addr))
return VNET_API_ERROR_INVALID_SRC_ADDRESS;
rx_fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
rx_table_id,
MFIB_SOURCE_DHCP);
if (is_del)
{
if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index,
addr, server_table_id))
{
mfib_table_entry_delete (rx_fib_index,
&all_dhcp_servers, MFIB_SOURCE_DHCP);
mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6,
MFIB_SOURCE_DHCP);
udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
0 /* is_ip6 */ );
udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
0 /* is_ip6 */ );
}
}
else
{
const fib_route_path_t path_for_us = {
.frp_proto = DPO_PROTO_IP6,
.frp_addr = zero_addr,
.frp_sw_if_index = 0xffffffff,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_flags = FIB_ROUTE_PATH_LOCAL,
.frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
};
if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr,
rx_fib_index, server_table_id))
{
mfib_table_entry_path_update (rx_fib_index, &all_dhcp_servers,
MFIB_SOURCE_DHCP, MFIB_ENTRY_FLAG_NONE,
&path_for_us);
/*
* Each interface that is enabled in this table, needs to be added
* as an accepting interface, but this is not easily doable in VPP.
* So we cheat. Add a flag to the entry that indicates accept form
* any interface.
* We will still only accept on v6 enabled interfaces, since the
* input feature ensures this.
*/
mfib_table_entry_update (rx_fib_index,
&all_dhcp_servers,
MFIB_SOURCE_DHCP,
MFIB_RPF_ID_NONE,
MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
mfib_table_lock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
dhcpv6_proxy_to_client_node.index,
0 /* is_ip6 */ );
udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
dhcpv6_proxy_to_server_node.index,
0 /* is_ip6 */ );
}
}
mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
return (rc);
}
static clib_error_t *
dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
ip46_address_t addr, src_addr;
int set_server = 0, set_src_address = 0;
u32 rx_table_id = 0, server_table_id = 0;
int is_del = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "server %U", unformat_ip6_address, &addr.ip6))
set_server = 1;
else if (unformat (input, "src-address %U",
unformat_ip6_address, &src_addr.ip6))
set_src_address = 1;
else if (unformat (input, "server-fib-id %d", &server_table_id))
;
else if (unformat (input, "rx-fib-id %d", &rx_table_id))
;
else if (unformat (input, "delete") || unformat (input, "del"))
is_del = 1;
else
break;
}
if (is_del || (set_server && set_src_address))
{
int rv;
rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id,
server_table_id, is_del);
//TODO: Complete the errors
switch (rv)
{
case 0:
return 0;
case VNET_API_ERROR_INVALID_DST_ADDRESS:
return clib_error_return (0, "Invalid server address");
case VNET_API_ERROR_INVALID_SRC_ADDRESS:
return clib_error_return (0, "Invalid src address");
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return
(0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
default:
return clib_error_return (0, "BUG: rv %d", rv);
}
}
else
return clib_error_return (0, "parse error`%U'",
format_unformat_error, input);
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
.path = "set dhcpv6 proxy",
.short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
"[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
.function = dhcpv6_proxy_set_command_fn,
};
/* *INDENT-ON* */
static u8 *
format_dhcp6_proxy_server (u8 * s, va_list * args)
{
dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
fib_table_t *server_fib;
dhcp_server_t *server;
ip6_mfib_t *rx_fib;
if (proxy == 0)
{
s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
"Servers FIB,Address");
return s;
}
rx_fib = ip6_mfib_get (proxy->rx_fib_index);
s = format (s, "%=14u%=16U",
rx_fib->table_id,
format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
vec_foreach (server, proxy->dhcp_servers)
{
server_fib = fib_table_get (server->server_fib_index, FIB_PROTOCOL_IP6);
s = format (s, "%u,%U ",
server_fib->ft_table_id,
format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
}
return s;
}
static int
dhcp6_proxy_show_walk (dhcp_proxy_t * proxy, void *ctx)
{
vlib_main_t *vm = ctx;
vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy);
return (1);
}
static clib_error_t *
dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
vlib_cli_output (vm, "%U", format_dhcp6_proxy_server,
NULL /* header line */ );
dhcp_proxy_walk (FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm);
return (NULL);
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
.path = "show dhcpv6 proxy",
.short_help = "Display dhcpv6 proxy info",
.function = dhcpv6_proxy_show_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
dhcpv6_vss_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
u8 *vpn_ascii_id = 0;
u32 oui = 0, fib_id = 0, tbl_id = ~0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "table %d", &tbl_id))
;
else if (unformat (input, "oui %d", &oui))
vss_type = VSS_TYPE_VPN_ID;
else if (unformat (input, "vpn-id %d", &fib_id))
vss_type = VSS_TYPE_VPN_ID;
else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
vss_type = VSS_TYPE_ASCII;
else if (unformat (input, "delete") || unformat (input, "del"))
is_del = 1;
else
break;
}
if (tbl_id == ~0)
return clib_error_return (0, "no table ID specified.");
int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP6, tbl_id, vss_type,
vpn_ascii_id, oui, fib_id, is_del);
switch (rv)
{
case 0:
return 0;
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return (0, "vss for table %d not found in pool.",
tbl_id);
default:
return clib_error_return (0, "BUG: rv %d", rv);
}
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
.path = "set dhcpv6 vss",
.short_help = "set dhcpv6 vss table <table-id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
.function = dhcpv6_vss_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
dhcpv6_vss_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
dhcp_vss_walk (FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm);
return (NULL);
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
.path = "show dhcpv6 vss",
.short_help = "show dhcpv6 VSS",
.function = dhcpv6_vss_show_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
vnet_main_t *vnm = vnet_get_main ();
u32 sw_if_index0 = 0, sw_if_index;
vnet_sw_interface_t *swif;
ip6_address_t *ia0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "%U",
unformat_vnet_sw_interface, vnm, &sw_if_index0))
{
swif = vnet_get_sw_interface (vnm, sw_if_index0);
sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
swif->unnumbered_sw_if_index : sw_if_index0;
ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
if (ia0)
{
vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
vlib_cli_output (vm, "%=20U%=48U",
format_vnet_sw_if_index_name, vnm,
sw_if_index0, format_ip6_address, ia0);
}
else
vlib_cli_output (vm, "%=34s%=20U",
"No IPv6 address configured on",
format_vnet_sw_if_index_name, vnm, sw_if_index);
}
else
break;
}
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
.path = "show dhcpv6 link-address interface",
.short_help = "show dhcpv6 link-address interface <interface>",
.function = dhcpv6_link_address_show_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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