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gerrit.nordix.org / fdio / vpp / fca0c242e4edfdb05231ef18d60c14273067ff0a / . / src / vnet / dhcp / proxy_node.c
blob: 6a58fcdb1852c9f3dcb53a0b7b01c27d56aa0fdc [file] [log] [blame]
/*
* proxy_node.c: dhcp 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 <vnet/pg/pg.h>
#include <vnet/dhcp/proxy.h>
#include <vnet/fib/ip4_fib.h>
static char * dhcp_proxy_error_strings[] = {
#define dhcp_proxy_error(n,s) s,
#include "proxy_error.def"
#undef dhcp_proxy_error
};
#define foreach_dhcp_proxy_to_server_input_next \
_ (DROP, "error-drop") \
_ (LOOKUP, "ip4-lookup") \
_ (SEND_TO_CLIENT, "dhcp-proxy-to-client")
typedef enum {
#define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
foreach_dhcp_proxy_to_server_input_next
#undef _
DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
} dhcp_proxy_to_server_input_next_t;
typedef struct {
/* 0 => to server, 1 => to client */
int which;
ip4_address_t trace_ip4_address;
u32 error;
u32 sw_if_index;
u32 original_sw_if_index;
} dhcp_proxy_trace_t;
#define VPP_DHCP_OPTION82_SUB1_SIZE 6
#define VPP_DHCP_OPTION82_SUB5_SIZE 6
#define VPP_DHCP_OPTION82_VSS_SIZE 12
#define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
VPP_DHCP_OPTION82_SUB5_SIZE + \
VPP_DHCP_OPTION82_VSS_SIZE +3)
vlib_node_registration_t dhcp_proxy_to_server_node;
vlib_node_registration_t dhcp_proxy_to_client_node;
u8 * format_dhcp_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 *);
dhcp_proxy_trace_t * t = va_arg (*args, dhcp_proxy_trace_t *);
if (t->which == 0)
s = format (s, "DHCP proxy: sent to server %U\n",
format_ip4_address, &t->trace_ip4_address, t->error);
else
s = format (s, "DHCP proxy: broadcast to client from %U\n",
format_ip4_address, &t->trace_ip4_address);
if (t->error != (u32)~0)
s = format (s, " error: %s\n", dhcp_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;
}
u8 * format_dhcp_proxy_header_with_length (u8 * s, va_list * args)
{
dhcp_header_t * h = va_arg (*args, dhcp_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, "dhcp header truncated");
s = format (s, "DHCP Proxy");
return s;
}
static uword
dhcp_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, pkts_no_server=0;
u32 pkts_no_interface_address=0;
u32 pkts_too_big=0;
ip4_main_t * im = &ip4_main;
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)
{
u32 bi0;
vlib_buffer_t * b0;
udp_header_t * u0;
dhcp_header_t * h0;
ip4_header_t * ip0;
u32 next0;
u32 old0, new0;
ip_csum_t sum0;
u32 error0 = (u32) ~0;
u32 sw_if_index = 0;
u32 original_sw_if_index = 0;
u8 *end = NULL;
u32 fib_index, server_index;
dhcp_server_t * server;
u32 rx_sw_if_index;
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);
h0 = vlib_buffer_get_current (b0);
/*
* udp_local hands us the DHCP header, need udp hdr,
* ip hdr to relay to server
*/
vlib_buffer_advance (b0, -(sizeof(*u0)));
u0 = vlib_buffer_get_current (b0);
/* This blows. Return traffic has src_port = 67, dst_port = 67 */
if (u0->src_port == clib_net_to_host_u16(UDP_DST_PORT_dhcp_to_server))
{
vlib_buffer_advance (b0, sizeof(*u0));
next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
error0 = 0;
pkts_to_client++;
goto do_enqueue;
}
rx_sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX];
fib_index = im->fib_index_by_sw_if_index [rx_sw_if_index];
if (fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
server_index = dpm->dhcp_server_index_by_rx_fib_index[fib_index];
else
server_index = 0;
if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp_servers,
server_index)))
{
no_server:
error0 = DHCP_PROXY_ERROR_NO_SERVER;
next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_no_server++;
goto do_trace;
}
server = pool_elt_at_index (dpm->dhcp_servers, server_index);
if (server->valid == 0)
goto no_server;
vlib_buffer_advance (b0, -(sizeof(*ip0)));
ip0 = vlib_buffer_get_current (b0);
/* disable UDP checksum */
u0->checksum = 0;
sum0 = ip0->checksum;
old0 = ip0->dst_address.as_u32;
new0 = server->dhcp_server.as_u32;
ip0->dst_address.as_u32 = server->dhcp_server.as_u32;
sum0 = ip_csum_update (sum0, old0, new0,
ip4_header_t /* structure */,
dst_address /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
sum0 = ip0->checksum;
old0 = ip0->src_address.as_u32;
new0 = server->dhcp_src_address.as_u32;
ip0->src_address.as_u32 = new0;
sum0 = ip_csum_update (sum0, old0, new0,
ip4_header_t /* structure */,
src_address /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
/* Send to DHCP server via the configured FIB */
vnet_buffer(b0)->sw_if_index[VLIB_TX] =
server->server_fib_index;
h0->gateway_ip_address.as_u32 = server->dhcp_src_address.as_u32;
pkts_to_server++;
if (server->insert_option_82)
{
u32 fib_index, fib_id, opt82_fib_id=0, opt82_oui=0;
ip4_fib_t * fib;
dhcp_option_t *o = (dhcp_option_t *) h0->options;
u32 len = 0;
vlib_buffer_free_list_t *fl;
fib_index = im->fib_index_by_sw_if_index
[vnet_buffer(b0)->sw_if_index[VLIB_RX]];
fib = ip4_fib_get (fib_index);
fib_id = fib->table_id;
end = b0->data + b0->current_data + b0->current_length;
/* TLVs are not performance-friendly... */
while (o->option != 0xFF /* end of options */ && (u8 *)o < end)
o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
fl = vlib_buffer_get_free_list (vm, b0->free_list_index);
// start write at (option*)o, some packets have padding
if (((u8 *)o - (u8 *)b0->data + VPP_DHCP_OPTION82_SIZE) > fl->n_data_bytes)
{
next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_too_big++;
goto do_trace;
}
if ((o->option == 0xFF) && ((u8 *)o <= end))
{
vnet_main_t *vnm = vnet_get_main();
u16 old_l0, new_l0;
ip4_address_t _ia0, * ia0 = &_ia0;
uword *p_vss;
vss_info *vss;
vnet_sw_interface_t *swif;
sw_if_index = 0;
original_sw_if_index = 0;
original_sw_if_index = sw_if_index =
vnet_buffer(b0)->sw_if_index[VLIB_RX];
swif = vnet_get_sw_interface (vnm, sw_if_index);
if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
sw_if_index = swif->unnumbered_sw_if_index;
p_vss = hash_get (dpm->opt82vss_index_by_vrf_id,
fib_id);
if (p_vss)
{
vss = pool_elt_at_index (dpm->opt82vss, p_vss[0]);
opt82_oui = vss->vpn_id.oui;
opt82_fib_id = vss->vpn_id.fib_id;
}
/*
* Get the first ip4 address on the [client-side]
* RX interface, if not unnumbered. otherwise use
* the loopback interface's ip address.
*/
ia0 = ip4_interface_first_address(&ip4_main, sw_if_index, 0);
if (ia0 == 0)
{
error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
pkts_no_interface_address++;
goto do_trace;
}
/* Add option 82 */
o->option = 82; /* option 82 */
o->length = 12; /* 12 octets to follow */
o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */
o->data[1] = 4; /* length of suboption */
o->data[2] = (original_sw_if_index >> 24) & 0xFF;
o->data[3] = (original_sw_if_index >> 16) & 0xFF;
o->data[4] = (original_sw_if_index >> 8) & 0xFF;
o->data[5] = (original_sw_if_index >> 0) & 0xFF;
o->data[6] = 5; /* suboption 5 (client RX intfc address) */
o->data[7] = 4; /* length 4 */
o->data[8] = ia0->as_u8[0];
o->data[9] = ia0->as_u8[1];
o->data[10] = ia0->as_u8[2];
o->data[11] = ia0->as_u8[3];
o->data[12] = 0xFF;
if (opt82_oui !=0 || opt82_fib_id != 0)
{
o->data[12] = 151; /* vss suboption */
if (255 == opt82_fib_id) {
o->data[13] = 1; /* length */
o->data[14] = 255; /* vss option type */
o->data[15] = 152; /* vss control suboption */
o->data[16] = 0; /* length */
/* and a new "end-of-options" option (0xff) */
o->data[17] = 0xFF;
o->length += 5;
} else {
o->data[13] = 8; /* length */
o->data[14] = 1; /* vss option type */
o->data[15] = (opt82_oui >> 16) & 0xff;
o->data[16] = (opt82_oui >> 8) & 0xff;
o->data[17] = (opt82_oui ) & 0xff;
o->data[18] = (opt82_fib_id >> 24) & 0xff;
o->data[19] = (opt82_fib_id >> 16) & 0xff;
o->data[20] = (opt82_fib_id >> 8) & 0xff;
o->data[21] = (opt82_fib_id) & 0xff;
o->data[22] = 152; /* vss control suboption */
o->data[23] = 0; /* length */
/* and a new "end-of-options" option (0xff) */
o->data[24] = 0xFF;
o->length += 12;
}
}
len = o->length + 3;
b0->current_length += len;
/* Fix IP header length and checksum */
old_l0 = ip0->length;
new_l0 = clib_net_to_host_u16 (old_l0);
new_l0 += len;
new_l0 = clib_host_to_net_u16 (new_l0);
ip0->length = new_l0;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
/* Fix UDP length */
new_l0 = clib_net_to_host_u16 (u0->length);
new_l0 += len;
u0->length = clib_host_to_net_u16 (new_l0);
} else {
vlib_node_increment_counter
(vm, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
}
}
next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
do_trace:
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
dhcp_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 = original_sw_if_index;
tr->sw_if_index = sw_if_index;
if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
tr->trace_ip4_address.as_u32 = server->dhcp_server.as_u32;
}
do_enqueue:
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, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
pkts_to_client);
vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_RELAY_TO_SERVER,
pkts_to_server);
vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_NO_SERVER,
pkts_no_server);
vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
pkts_no_interface_address);
vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
DHCP_PROXY_ERROR_PKT_TOO_BIG,
pkts_too_big);
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (dhcp_proxy_to_server_node) = {
.function = dhcp_proxy_to_server_input,
.name = "dhcp-proxy-to-server",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = DHCP_PROXY_N_ERROR,
.error_strings = dhcp_proxy_error_strings,
.n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
foreach_dhcp_proxy_to_server_input_next
#undef _
},
.format_buffer = format_dhcp_proxy_header_with_length,
.format_trace = format_dhcp_proxy_trace,
#if 0
.unformat_buffer = unformat_dhcp_proxy_header,
#endif
};
static uword
dhcp_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 = ethernet_get_main (vm);
dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
vnet_main_t * vnm = vnet_get_main();
ip4_main_t * im = &ip4_main;
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;
dhcp_header_t * h0;
ip4_header_t * ip0 = 0;
ip4_address_t * ia0 = 0;
u32 old0, new0;
ip_csum_t sum0;
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;
vnet_sw_interface_t *si0;
u32 error0 = (u32)~0;
vnet_sw_interface_t *swif;
u32 server_index;
u32 fib_index;
dhcp_server_t * server;
u32 original_sw_if_index = (u32) ~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 DHCP header, need udp hdr,
* ip hdr to relay to client
*/
vlib_buffer_advance (b0, -(sizeof(*u0)));
u0 = vlib_buffer_get_current (b0);
vlib_buffer_advance (b0, -(sizeof(*ip0)));
ip0 = vlib_buffer_get_current (b0);
/* Consumed by dhcp client code? */
if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
continue;
if (1 /* dpm->insert_option_82 */)
{
dhcp_option_t *o = (dhcp_option_t *) h0->options;
dhcp_option_t *sub;
/* Parse through TLVs looking for option 82.
The circuit-ID is the FIB number we need
to track down the client-facing interface */
while (o->option != 0xFF /* end of options */ &&
(u8 *) o < (b0->data + b0->current_data + b0->current_length))
{
if (o->option == 82)
{
u32 vss_exist = 0;
u32 vss_ctrl = 0;
sub = (dhcp_option_t *) &o->data[0];
while (sub->option != 0xFF /* end of options */ &&
(u8 *) sub < (u8 *)(o + o->length)) {
/* If this is one of ours, it will have
total length 12, circuit-id suboption type,
and the sw_if_index */
if (sub->option == 1 && sub->length == 4)
{
sw_if_index = (o->data[2] << 24)
| (o->data[3] << 16)
| (o->data[4] << 8)
| (o->data[5]);
} else if (sub->option == 151 &&
sub->length == 7 &&
sub->data[0] == 1)
vss_exist = 1;
else if (sub->option == 152 && sub->length == 0)
vss_ctrl = 1;
sub = (dhcp_option_t *)
(((uword) sub) + (sub->length + 2));
}
if (vss_ctrl && vss_exist)
vlib_node_increment_counter
(vm, dhcp_proxy_to_client_node.index,
DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
}
o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
}
}
if (sw_if_index == (u32)~0)
{
error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
drop_packet:
vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
error0, 1);
f0 = vlib_get_frame_to_node (vm, dpm->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, dpm->error_drop_node_index, f0);
goto do_trace;
}
if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
{
error0 = DHCP_PROXY_ERROR_BAD_OPTION_82;
goto drop_packet;
}
fib_index = im->fib_index_by_sw_if_index [sw_if_index];
if (fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
server_index = dpm->dhcp_server_index_by_rx_fib_index[fib_index];
else
server_index = 0;
if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp_servers,
server_index)))
{
error0 = DHCP_PROXY_ERROR_BAD_OPTION_82;
goto drop_packet;
}
server = pool_elt_at_index (dpm->dhcp_servers, server_index);
if (server->valid == 0)
{
error0 = DHCP_PROXY_ERROR_NO_SERVER;
goto drop_packet;
}
if (ip0->src_address.as_u32 != server->dhcp_server.as_u32)
{
error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
goto drop_packet;
}
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
swif = vnet_get_sw_interface (vnm, sw_if_index);
original_sw_if_index = sw_if_index;
if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
sw_if_index = swif->unnumbered_sw_if_index;
ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
if (ia0 == 0)
{
error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
goto drop_packet;
}
u0->checksum = 0;
u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
sum0 = ip0->checksum;
old0 = ip0->dst_address.as_u32;
new0 = 0xFFFFFFFF;
ip0->dst_address.as_u32 = new0;
sum0 = ip_csum_update (sum0, old0, new0,
ip4_header_t /* structure */,
dst_address /* offset of changed member */);
ip0->checksum = ip_csum_fold (sum0);
sum0 = ip0->checksum;
old0 = ip0->src_address.as_u32;
new0 = ia0->as_u32;
ip0->src_address.as_u32 = new0;
sum0 = ip_csum_update (sum0, old0, new0,
ip4_header_t /* structure */,
src_address /* offset of changed member */);
ip0->checksum = ip_csum_fold (sum0);
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)
vlib_buffer_advance (b0, -4 /* space for VLAN tag */);
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 (ei0->address));
memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x0800);
if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
{
u32 * vlan_tag = (u32 *)(mac0+1);
u32 tmp;
tmp = (si0->sub.id << 16) | 0x0800;
*vlan_tag = clib_host_to_net_u32 (tmp);
}
/* $$$ This needs to be rewritten, for sure */
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))
{
dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
b0, sizeof (*tr));
tr->which = 1; /* to client */
tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
tr->error = error0;
tr->original_sw_if_index = original_sw_if_index;
tr->sw_if_index = sw_if_index;
}
}
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (dhcp_proxy_to_client_node) = {
.function = dhcp_proxy_to_client_input,
.name = "dhcp-proxy-to-client",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = DHCP_PROXY_N_ERROR,
.error_strings = dhcp_proxy_error_strings,
.format_buffer = format_dhcp_proxy_header_with_length,
.format_trace = format_dhcp_proxy_trace,
#if 0
.unformat_buffer = unformat_dhcp_proxy_header,
#endif
};
clib_error_t * dhcp_proxy_init (vlib_main_t * vm)
{
dhcp_proxy_main_t * dm = &dhcp_proxy_main;
vlib_node_t * error_drop_node;
dhcp_server_t * server;
dm->vlib_main = vm;
dm->vnet_main = vnet_get_main();
error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
dm->error_drop_node_index = error_drop_node->index;
dm->opt82vss_index_by_vrf_id = hash_create (0, sizeof (uword));
udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
dhcp_proxy_to_client_node.index, 1 /* is_ip4 */);
udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
dhcp_proxy_to_server_node.index, 1 /* is_ip4 */);
/* Create the default server, don't mark it valid */
pool_get (dm->dhcp_servers, server);
memset (server, 0, sizeof (*server));
return 0;
}
VLIB_INIT_FUNCTION (dhcp_proxy_init);
int dhcp_proxy_set_server_2 (ip4_address_t *addr, ip4_address_t *src_address,
u32 rx_fib_id,
u32 server_fib_id,
int insert_option_82, int is_del)
{
dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
dhcp_server_t * server = 0;
u32 server_index = 0;
u32 rx_fib_index = 0;
const fib_prefix_t all_1s =
{
.fp_len = 32,
.fp_addr.ip4.as_u32 = 0xffffffff,
.fp_proto = FIB_PROTOCOL_IP4,
};
if (addr->as_u32 == 0)
return VNET_API_ERROR_INVALID_DST_ADDRESS;
if (src_address->as_u32 == 0)
return VNET_API_ERROR_INVALID_SRC_ADDRESS;
rx_fib_index = fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP4,
rx_fib_id);
if (rx_fib_id == 0)
{
server = pool_elt_at_index (dpm->dhcp_servers, 0);
if (is_del)
{
memset (server, 0, sizeof (*server));
fib_table_entry_special_remove(rx_fib_index,
&all_1s,
FIB_SOURCE_DHCP);
return 0;
}
if (!server->valid)
fib_table_entry_special_add(rx_fib_index,
&all_1s,
FIB_SOURCE_DHCP,
FIB_ENTRY_FLAG_LOCAL,
ADJ_INDEX_INVALID);
goto initialize_it;
}
if (is_del)
{
if (rx_fib_index >= vec_len(dpm->dhcp_server_index_by_rx_fib_index))
return VNET_API_ERROR_NO_SUCH_ENTRY;
server_index = dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index];
ASSERT(server_index > 0);
/* Use the default server again. */
dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index] = 0;
server = pool_elt_at_index (dpm->dhcp_servers, server_index);
memset (server, 0, sizeof (*server));
pool_put (dpm->dhcp_servers, server);
fib_table_entry_special_remove(rx_fib_index,
&all_1s,
FIB_SOURCE_DHCP);
return 0;
}
if (rx_fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
{
server_index = dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index];
if (server_index != 0)
{
server = pool_elt_at_index (dpm->dhcp_servers, server_index);
goto initialize_it;
}
}
pool_get (dpm->dhcp_servers, server);
fib_table_entry_special_add(rx_fib_index,
&all_1s,
FIB_SOURCE_DHCP,
FIB_ENTRY_FLAG_LOCAL,
ADJ_INDEX_INVALID);
initialize_it:
server->dhcp_server.as_u32 = addr->as_u32;
server->server_fib_index =
fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP4,
server_fib_id);
server->dhcp_src_address.as_u32 = src_address->as_u32;
server->insert_option_82 = insert_option_82;
server->valid = 1;
if (rx_fib_index)
{
vec_validate (dpm->dhcp_server_index_by_rx_fib_index, rx_fib_index);
dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index] =
server - dpm->dhcp_servers;
}
return 0;
}
/* Old API, manipulates the default server (only) */
int dhcp_proxy_set_server (ip4_address_t *addr, ip4_address_t *src_address,
u32 fib_id, int insert_option_82, int is_del)
{
return dhcp_proxy_set_server_2 (addr, src_address, 0 /* rx_fib_id */,
fib_id /* server_fib_id */,
insert_option_82, is_del);
}
static clib_error_t *
dhcp_proxy_set_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
ip4_address_t server_addr, src_addr;
u32 server_fib_id = 0, rx_fib_id = 0;
int is_del = 0;
int add_option_82 = 0;
int set_src = 0, set_server = 0;
while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "server %U",
unformat_ip4_address, &server_addr))
set_server = 1;
else if (unformat (input, "server-fib-id %d", &server_fib_id))
;
else if (unformat (input, "rx-fib-id %d", &rx_fib_id))
;
else if (unformat(input, "src-address %U",
unformat_ip4_address, &src_addr))
set_src = 1;
else if (unformat (input, "add-option-82")
|| unformat (input, "insert-option-82"))
add_option_82 = 1;
else if (unformat (input, "delete") ||
unformat (input, "del"))
is_del = 1;
else
break;
}
if (is_del || (set_server && set_src))
{
int rv;
rv = dhcp_proxy_set_server_2 (&server_addr, &src_addr, rx_fib_id,
server_fib_id, add_option_82, is_del);
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_INNER_FIB:
return clib_error_return (0, "No such rx fib id %d", rx_fib_id);
case VNET_API_ERROR_NO_SUCH_FIB:
return clib_error_return (0, "No such server fib id %d",
server_fib_id);
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return
(0, "Fib id %d: no per-fib DHCP server configured", rx_fib_id);
default:
return clib_error_return (0, "BUG: rv %d", rv);
}
}
else
return clib_error_return (0, "parse error`%U'",
format_unformat_error, input);
}
VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
.path = "set dhcp proxy",
.short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [add-option-82] [server-fib-id <n>] [rx-fib-id <n>]",
.function = dhcp_proxy_set_command_fn,
};
u8 * format_dhcp_proxy_server (u8 * s, va_list * args)
{
dhcp_proxy_main_t * dm = va_arg (*args, dhcp_proxy_main_t *);
dhcp_server_t * server = va_arg (*args, dhcp_server_t *);
u32 rx_fib_index = va_arg (*args, u32);
ip4_fib_t * rx_fib, * server_fib;
u32 server_fib_id = ~0, rx_fib_id = ~0;
if (dm == 0)
{
s = format (s, "%=16s%=16s%=14s%=14s%=20s", "Server", "Src Address",
"Server FIB", "RX FIB", "Insert Option 82");
return s;
}
server_fib = ip4_fib_get(server->server_fib_index);
if (server_fib)
server_fib_id = server_fib->table_id;
rx_fib = ip4_fib_get(rx_fib_index);
if (rx_fib)
rx_fib_id = rx_fib->table_id;
s = format (s, "%=16U%=16U%=14u%=14u%=20s",
format_ip4_address, &server->dhcp_server,
format_ip4_address, &server->dhcp_src_address,
server_fib_id, rx_fib_id,
server->insert_option_82 ? "yes" : "no");
return s;
}
static clib_error_t *
dhcp_proxy_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
ip4_main_t * im = &ip4_main;
dhcp_server_t * server;
u32 server_index;
int i;
vlib_cli_output (vm, "%U", format_dhcp_proxy_server, 0 /* header line */,
0, 0);
for (i = 0; i < vec_len (im->fibs); i++)
{
if (i < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
server_index = dpm->dhcp_server_index_by_rx_fib_index[i];
else
server_index = 0;
server = pool_elt_at_index (dpm->dhcp_servers, server_index);
if (server->valid)
vlib_cli_output (vm, "%U", format_dhcp_proxy_server, dpm,
server, i);
}
return 0;
}
VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
.path = "show dhcp proxy",
.short_help = "Display dhcp proxy server info",
.function = dhcp_proxy_show_command_fn,
};
int dhcp_proxy_set_option82_vss( u32 vrf_id,
u32 oui,
u32 fib_id,
int is_del)
{
dhcp_proxy_main_t *dm = &dhcp_proxy_main;
uword *p;
vss_info *a;
u32 old_oui=0, old_fib_id=0;
p = hash_get (dm->opt82vss_index_by_vrf_id, vrf_id);
if (p)
{
a = pool_elt_at_index (dm->opt82vss, p[0]);
if (!a)
return VNET_API_ERROR_NO_SUCH_FIB;
old_oui = a->vpn_id.oui;
old_fib_id = a->vpn_id.fib_id;
if (is_del)
{
if (old_oui == oui &&
old_fib_id == fib_id)
{
pool_put(dm->opt82vss, a);
hash_unset (dm->opt82vss_index_by_vrf_id, vrf_id);
return 0;
}
else
return VNET_API_ERROR_NO_SUCH_ENTRY;
}
pool_put(dm->opt82vss, a);
hash_unset (dm->opt82vss_index_by_vrf_id, vrf_id);
} else if (is_del)
return VNET_API_ERROR_NO_SUCH_ENTRY;
pool_get (dm->opt82vss, a);
memset (a, ~0, sizeof (a[0]));
a->vpn_id.oui = oui;
a->vpn_id.fib_id = fib_id;
hash_set (dm->opt82vss_index_by_vrf_id, vrf_id, a - dm->opt82vss);
return 0;
}
static clib_error_t *
dhcp_option_82_vss_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
int is_del = 0, got_new_vpn_id=0;
u32 oui=0, fib_id=0, tbl_id=~0;
while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
{
if (unformat(input, "delete") || unformat(input, "del"))
is_del = 1;
else if (unformat (input, "oui %d", &oui))
got_new_vpn_id = 1;
else if (unformat (input, "vpn-id %d", &fib_id))
got_new_vpn_id = 1;
else if (unformat (input, "table %d", &tbl_id))
got_new_vpn_id = 1;
else
break;
}
if (tbl_id == ~0)
return clib_error_return (0, "no table ID specified.");
if (is_del || got_new_vpn_id)
{
int rv;
rv = dhcp_proxy_set_option82_vss(tbl_id, oui, fib_id, is_del);
switch (rv)
{
case 0:
return 0;
case VNET_API_ERROR_NO_SUCH_FIB:
return clib_error_return (0, "option 82 vss(oui:%d, vpn-id:%d) not found in table %d",
oui, fib_id, tbl_id);
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return (0, "option 82 vss for table %d not found in in pool.",
tbl_id);
default:
return clib_error_return (0, "BUG: rv %d", rv);
}
}
else
return clib_error_return (0, "parse error`%U'",
format_unformat_error, input);
}
VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
.path = "set dhcp option-82 vss",
.short_help = "set dhcp option-82 vss [del] table <table id> oui <oui> vpn-id <vpn-id>",
.function = dhcp_option_82_vss_fn,
};
static clib_error_t *
dhcp_vss_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
dhcp_proxy_main_t * dm = &dhcp_proxy_main;
vss_info *v;
u32 oui;
u32 fib_id;
u32 tbl_id;
uword index;
vlib_cli_output (vm, "%=9s%=11s%=12s","Table", "OUI", "VPN-ID");
hash_foreach (tbl_id, index, dm->opt82vss_index_by_vrf_id,
({
v = pool_elt_at_index (dm->opt82vss, index);
oui = v->vpn_id.oui;
fib_id = v->vpn_id.fib_id;
vlib_cli_output (vm, "%=9d 0x%08x%=12d",
tbl_id, oui, fib_id);
}));
return 0;
}
VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
.path = "show dhcp vss",
.short_help = "show dhcp VSS",
.function = dhcp_vss_show_command_fn,
};
static clib_error_t *
dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
dhcp_proxy_main_t *dm = &dhcp_proxy_main;
vnet_main_t *vnm = vnet_get_main();
u32 sw_if_index0=0, sw_if_index;
ip4_address_t *ia0;
vnet_sw_interface_t *swif;
while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
{
if (unformat(input, "%U",
unformat_vnet_sw_interface, dm->vnet_main, &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 = ip4_interface_first_address(&ip4_main, sw_if_index, 0);
if (ia0)
{
vlib_cli_output (vm, "%=20s%=20s", "interface",
"source IP address");
vlib_cli_output (vm, "%=20U%=20U",
format_vnet_sw_if_index_name,
dm->vnet_main, sw_if_index0,
format_ip4_address, ia0);
}
else
vlib_cli_output (vm, "%=34s %=20U",
"No IPv4 address configured on",
format_vnet_sw_if_index_name,
dm->vnet_main, sw_if_index);
}
else
break;
}
return 0;
}
VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
.path = "show dhcp option-82-address interface",
.short_help = "show dhcp option-82-address interface <interface>",
.function = dhcp_option_82_address_show_command_fn,
};