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/*
* Copyright (c) 2015 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/flow/flow_report.h>
#include <vnet/flow/flow_report_classify.h>
#include <vnet/api_errno.h>
/* Common prefix of tcp and udp headers
* containing only source and destination port fields */
typedef struct {
u16 src_port, dst_port;
} tcpudp_header_t;
flow_report_classify_main_t flow_report_classify_main;
u8 * ipfix_classify_template_rewrite (flow_report_main_t * frm,
flow_report_t * fr,
ip4_address_t * collector_address,
ip4_address_t * src_address,
u16 collector_port)
{
flow_report_classify_main_t * fcm = &flow_report_classify_main;
vnet_classify_table_t * tblp;
vnet_classify_main_t * vcm = &vnet_classify_main;
u32 flow_table_index = fr->opaque.as_uword;
u8 * ip_start;
ip4_header_t * ip;
ip6_header_t * ip6;
tcpudp_header_t * tcpudp;
udp_header_t * udp;
ipfix_message_header_t * h;
ipfix_set_header_t * s;
ipfix_template_header_t * t;
ipfix_field_specifier_t * f;
ipfix_field_specifier_t * first_field;
u8 * rewrite = 0;
ip4_ipfix_template_packet_t * tp;
i32 l3_offset = -2; /* sizeof (ethernet_header_t) - sizeof (u32x4) */
u32 field_count = 0;
u32 field_index = 0;
flow_report_stream_t * stream;
u8 ip_version;
u8 transport_protocol;
stream = &frm->streams[fr->stream_index];
ipfix_classify_table_t * table = &fcm->tables[flow_table_index];
ip_version = table->ip_version;
transport_protocol = table->transport_protocol;
tblp = pool_elt_at_index (vcm->tables, table->classify_table_index);
/*
* Mumble, assumes that we're not classifying on L2 or first 2 octets
* of L3..
*/
/* Determine field count */
ip_start = ((u8 *)(tblp->mask)) + l3_offset;
#define _(field,mask,item,length) \
if (memcmp(&field, &mask, length) == 0) \
{ \
field_count++; \
\
fr->fields_to_send = clib_bitmap_set (fr->fields_to_send, \
field_index, 1); \
} \
field_index++;
foreach_ipfix_field;
#undef _
/* Add packetTotalCount manually */
field_count += 1;
/* $$$ enterprise fields, at some later date */
/* allocate rewrite space */
vec_validate_aligned (rewrite,
sizeof (ip4_ipfix_template_packet_t)
+ field_count * sizeof (ipfix_field_specifier_t) - 1,
CLIB_CACHE_LINE_BYTES);
tp = (ip4_ipfix_template_packet_t *) rewrite;
ip = (ip4_header_t *) &tp->ip4;
udp = (udp_header_t *) (ip+1);
h = (ipfix_message_header_t *)(udp+1);
s = (ipfix_set_header_t *)(h+1);
t = (ipfix_template_header_t *)(s+1);
first_field = f = (ipfix_field_specifier_t *)(t+1);
ip->ip_version_and_header_length = 0x45;
ip->ttl = 254;
ip->protocol = IP_PROTOCOL_UDP;
ip->src_address.as_u32 = src_address->as_u32;
ip->dst_address.as_u32 = collector_address->as_u32;
udp->src_port = clib_host_to_net_u16 (stream->src_port);
udp->dst_port = clib_host_to_net_u16 (collector_port);
udp->length = clib_host_to_net_u16 (vec_len(rewrite) - sizeof (*ip));
/* FIXUP: message header export_time */
/* FIXUP: message header sequence_number */
h->domain_id = clib_host_to_net_u32 (stream->domain_id);
/* Take another trip through the mask and build the template */
ip_start = ((u8 *)(tblp->mask)) + l3_offset;
#define _(field,mask,item,length) \
if (memcmp(&field, &mask, length) == 0) \
{ \
f->e_id_length = ipfix_e_id_length (0 /* enterprise */, \
item, length); \
f++; \
}
foreach_ipfix_field;
#undef _
/* Add packetTotalCount manually */
f->e_id_length = ipfix_e_id_length (0 /* enterprise */, packetTotalCount, 8);
f++;
/* Back to the template packet... */
ip = (ip4_header_t *) &tp->ip4;
udp = (udp_header_t *) (ip+1);
ASSERT (f - first_field);
/* Field count in this template */
t->id_count = ipfix_id_count (fr->template_id, f - first_field);
/* set length in octets*/
s->set_id_length = ipfix_set_id_length (2 /* set_id */, (u8 *) f - (u8 *)s);
/* message length in octets */
h->version_length = version_length ((u8 *)f - (u8 *)h);
ip->length = clib_host_to_net_u16 ((u8 *)f - (u8 *)ip);
ip->checksum = ip4_header_checksum (ip);
return rewrite;
}
vlib_frame_t * ipfix_classify_send_flows (flow_report_main_t * frm,
flow_report_t * fr,
vlib_frame_t * f,
u32 * to_next,
u32 node_index)
{
flow_report_classify_main_t * fcm = &flow_report_classify_main;
vnet_classify_main_t * vcm = &vnet_classify_main;
u32 flow_table_index = fr->opaque.as_uword;
vnet_classify_table_t * t;
vnet_classify_bucket_t * b;
vnet_classify_entry_t * v, * save_v;
vlib_buffer_t *b0 = 0;
u32 next_offset = 0;
u32 record_offset = 0;
u32 bi0 = ~0;
int i, j, k;
ip4_ipfix_template_packet_t * tp;
ipfix_message_header_t * h = 0;
ipfix_set_header_t * s = 0;
u8 * ip_start;
ip4_header_t * ip;
ip6_header_t * ip6;
tcpudp_header_t * tcpudp;
udp_header_t * udp;
int field_index;
u32 records_this_buffer;
u16 new_l0, old_l0;
ip_csum_t sum0;
vlib_main_t * vm = frm->vlib_main;
flow_report_stream_t * stream;
u8 ip_version;
u8 transport_protocol;
stream = &frm->streams[fr->stream_index];
ipfix_classify_table_t * table = &fcm->tables[flow_table_index];
ip_version = table->ip_version;
transport_protocol = table->transport_protocol;
t = pool_elt_at_index (vcm->tables, table->classify_table_index);
while (__sync_lock_test_and_set (t->writer_lock, 1))
;
for (i = 0; i < t->nbuckets; i++)
{
b = &t->buckets [i];
if (b->offset == 0)
continue;
save_v = vnet_classify_get_entry (t, b->offset);
for (j = 0; j < (1<<b->log2_pages); j++)
{
for (k = 0; k < t->entries_per_page; k++)
{
v = vnet_classify_entry_at_index
(t, save_v, j*t->entries_per_page + k);
if (vnet_classify_entry_is_free (v))
continue;
/* OK, we have something to send... */
if (PREDICT_FALSE (b0 == 0))
{
if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
goto flush;
b0 = vlib_get_buffer (vm, bi0);
u32 copy_len = sizeof(ip4_header_t) +
sizeof(udp_header_t) +
sizeof(ipfix_message_header_t);
clib_memcpy (b0->data, fr->rewrite, copy_len);
b0->current_data = 0;
b0->current_length = copy_len;
b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = frm->fib_index;
tp = vlib_buffer_get_current (b0);
ip = (ip4_header_t *) &tp->ip4;
udp = (udp_header_t *) (ip+1);
h = (ipfix_message_header_t *)(udp+1);
s = (ipfix_set_header_t *)(h+1);
/* FIXUP: message header export_time */
h->export_time = (u32)
(((f64)frm->unix_time_0) +
(vlib_time_now(frm->vlib_main) - frm->vlib_time_0));
h->export_time = clib_host_to_net_u32(h->export_time);
/* FIXUP: message header sequence_number */
h->sequence_number = stream->sequence_number;
h->sequence_number = clib_host_to_net_u32 (h->sequence_number);
next_offset = (u32) (((u8 *)(s+1)) - (u8 *)tp);
record_offset = next_offset;
records_this_buffer = 0;
}
field_index = 0;
ip_start = ((u8 *)v->key) - 2;
#define _(field,mask,item,length) \
if (clib_bitmap_get (fr->fields_to_send, field_index)) \
{ \
clib_memcpy (b0->data + next_offset, &field, \
length); \
next_offset += length; \
} \
field_index++;
foreach_ipfix_field;
#undef _
/* Add packetTotalCount manually */
{
u64 packets = clib_host_to_net_u64 (v->hits);
clib_memcpy (b0->data + next_offset, &packets, sizeof (packets));
next_offset += sizeof (packets);
}
records_this_buffer++;
stream->sequence_number++;
/* Next record will have the same size as this record */
u32 next_record_size = next_offset - record_offset;
record_offset = next_offset;
if (next_offset + next_record_size > frm->path_mtu)
{
s->set_id_length = ipfix_set_id_length (fr->template_id,
next_offset -
(sizeof (*ip) + sizeof (*udp) +
sizeof (*h)));
h->version_length = version_length (next_offset -
(sizeof (*ip) + sizeof (*udp)));
b0->current_length = next_offset;
b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
tp = vlib_buffer_get_current (b0);
ip = (ip4_header_t *) &tp->ip4;
udp = (udp_header_t *) (ip+1);
sum0 = ip->checksum;
old_l0 = ip->length;
new_l0 =
clib_host_to_net_u16 ((u16)next_offset);
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */);
ip->checksum = ip_csum_fold (sum0);
ip->length = new_l0;
udp->length =
clib_host_to_net_u16 (b0->current_length - sizeof (*ip));
if (frm->udp_checksum)
{
/* RFC 7011 section 10.3.2. */
udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip);
if (udp->checksum == 0)
udp->checksum = 0xffff;
}
ASSERT (ip->checksum == ip4_header_checksum (ip));
to_next[0] = bi0;
f->n_vectors++;
to_next++;
if (f->n_vectors == VLIB_FRAME_SIZE)
{
vlib_put_frame_to_node (vm, node_index, f);
f = vlib_get_frame_to_node (vm, node_index);
f->n_vectors = 0;
to_next = vlib_frame_vector_args (f);
}
b0 = 0;
bi0 = ~0;
}
}
}
}
flush:
if (b0)
{
s->set_id_length = ipfix_set_id_length (fr->template_id,
next_offset -
(sizeof (*ip) + sizeof (*udp) +
sizeof (*h)));
h->version_length = version_length (next_offset -
(sizeof (*ip) + sizeof (*udp)));
b0->current_length = next_offset;
b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
tp = vlib_buffer_get_current (b0);
ip = (ip4_header_t *) &tp->ip4;
udp = (udp_header_t *) (ip+1);
sum0 = ip->checksum;
old_l0 = ip->length;
new_l0 = clib_host_to_net_u16 ((u16)next_offset);
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */);
ip->checksum = ip_csum_fold (sum0);
ip->length = new_l0;
udp->length = clib_host_to_net_u16 (b0->current_length - sizeof (*ip));
if (frm->udp_checksum)
{
/* RFC 7011 section 10.3.2. */
udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip);
if (udp->checksum == 0)
udp->checksum = 0xffff;
}
ASSERT (ip->checksum == ip4_header_checksum (ip));
to_next[0] = bi0;
f->n_vectors++;
b0 = 0;
bi0 = ~0;
}
*(t->writer_lock) = 0;
return f;
}
static clib_error_t *
ipfix_classify_table_add_del_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
flow_report_classify_main_t *fcm = &flow_report_classify_main;
flow_report_main_t *frm = &flow_report_main;
vnet_flow_report_add_del_args_t args;
ipfix_classify_table_t * table;
int rv;
int is_add = -1;
u32 classify_table_index;
u8 ip_version = 0;
u8 transport_protocol = 255;
if (fcm->src_port == 0)
clib_error_return (0, "call 'set ipfix classify stream' first");
memset (&args, 0, sizeof (args));
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
if (unformat (input, "add"))
is_add = 1;
else if (unformat (input, "del"))
is_add = 0;
else if (unformat (input, "%d", &classify_table_index))
;
else if (unformat (input, "ip4"))
ip_version = 4;
else if (unformat (input, "ip6"))
ip_version = 6;
else if (unformat (input, "tcp"))
transport_protocol = 6;
else if (unformat (input, "udp"))
transport_protocol = 17;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
if (is_add == -1)
return clib_error_return (0, "expecting: add|del");
if (classify_table_index == ~0)
return clib_error_return (0, "classifier table not specified");
if (ip_version == 0)
return clib_error_return (0, "IP version not specified");
table = 0;
int i;
for (i = 0; i < vec_len(fcm->tables); i++)
if (ipfix_classify_table_index_valid(i))
if (fcm->tables[i].classify_table_index == classify_table_index) {
table = &fcm->tables[i];
break;
}
if (is_add) {
if (table)
return clib_error_return (0, "Specified classifier table already used");
table = ipfix_classify_add_table();
table->classify_table_index = classify_table_index;
} else {
if (!table)
return clib_error_return (0, "Specified classifier table not registered");
}
table->ip_version = ip_version;
table->transport_protocol = transport_protocol;
args.opaque.as_uword = table - fcm->tables;
args.rewrite_callback = ipfix_classify_template_rewrite;
args.flow_data_callback = ipfix_classify_send_flows;
args.is_add = is_add;
args.domain_id = fcm->domain_id;
args.src_port = fcm->src_port;
rv = vnet_flow_report_add_del (frm, &args);
switch (rv)
{
case 0:
break;
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return (0, "Flow report not found");
case VNET_API_ERROR_VALUE_EXIST:
return clib_error_return (0, "Flow report already exists");
case VNET_API_ERROR_INVALID_VALUE:
return clib_error_return (0, "Expecting either still unused values "
"for both domain_id and src_port "
"or already used values for both fields");
default:
return clib_error_return (0, "vnet_flow_report_add_del returned %d", rv);
}
if (is_add) {
if (rv != 0)
ipfix_classify_delete_table(table - fcm->tables);
} else {
if (rv == 0)
ipfix_classify_delete_table(table - fcm->tables);
}
return 0;
}
VLIB_CLI_COMMAND (ipfix_classify_table_add_del_command, static) = {
.path = "ipfix classify table",
.short_help = "ipfix classify table add|del <table-index>",
.function = ipfix_classify_table_add_del_command_fn,
};
static clib_error_t *
set_ipfix_classify_stream_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
flow_report_classify_main_t *fcm = &flow_report_classify_main;
flow_report_main_t *frm = &flow_report_main;
u32 domain_id = 1;
u32 src_port = UDP_DST_PORT_ipfix;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
if (unformat (input, "domain %d", &domain_id))
;
else if (unformat (input, "src-port %d", &src_port))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
if (fcm->src_port != 0 &&
(fcm->domain_id != domain_id ||
fcm->src_port != (u16)src_port)) {
int rv = vnet_stream_change (frm, fcm->domain_id, fcm->src_port,
domain_id, (u16)src_port);
ASSERT (rv == 0);
}
fcm->domain_id = domain_id;
fcm->src_port = (u16)src_port;
return 0;
}
VLIB_CLI_COMMAND (set_ipfix_classify_stream_command, static) = {
.path = "set ipfix classify stream",
.short_help = "set ipfix classify stream"
"[domain <domain-id>] [src-port <src-port>]",
.function = set_ipfix_classify_stream_command_fn,
};
static clib_error_t *
flow_report_classify_init (vlib_main_t *vm)
{
clib_error_t * error;
if ((error = vlib_call_init_function (vm, flow_report_init)))
return error;
return 0;
}
VLIB_INIT_FUNCTION (flow_report_classify_init);
|