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upf_input.c
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/*
* Copyright (c) 2020 Travelping GmbH
*
* 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 <inttypes.h>
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/tcp/tcp.h>
#include <vnet/tcp/tcp_inlines.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/ethernet/ethernet.h>
#include <upf/upf.h>
#include <upf/upf_pfcp.h>
#include <upf/upf_proxy.h>
#if CLIB_DEBUG > 1
#define upf_debug clib_warning
#else
#define upf_debug(...) \
do { } while (0)
#endif
typedef enum
{
UPF_INPUT_NEXT_DROP,
UPF_INPUT_NEXT_UPF_FORWARD,
UPF_INPUT_N_NEXT,
} upf_input_next_t;
/* Statistics (not all errors) */
#define foreach_upf_input_error \
_(LENGTH, "inconsistent ip/tcp lengths") \
_(NO_LISTENER, "no redirect server available") \
_(INPUT, "good packets input") \
_(OPTIONS, "Could not parse options") \
_(CREATE_SESSION_FAIL, "Sessions couldn't be allocated")
static char *upf_input_error_strings[] = {
#define _(sym,string) string,
foreach_upf_input_error
#undef _
};
typedef enum
{
#define _(sym,str) UPF_INPUT_ERROR_##sym,
foreach_upf_input_error
#undef _
UPF_INPUT_N_ERROR,
} upf_input_error_t;
typedef struct
{
u32 session_index;
u64 cp_seid;
u32 pdr_id;
u32 far_id;
u8 packet_data[64 - 1 * sizeof (u32)];
}
upf_input_trace_t;
static u8 *
format_upf_input_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 *);
upf_input_trace_t *t = va_arg (*args, upf_input_trace_t *);
u32 indent = format_get_indent (s);
s = format (s, "upf_session%d cp-seid 0x%016" PRIx64 " pdr %d far %d\n%U%U",
t->session_index, t->cp_seid, t->pdr_id, t->far_id,
format_white_space, indent,
format_ip4_header, t->packet_data, sizeof (t->packet_data));
return s;
}
static uword
upf_input (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame, int is_ip4)
{
u32 n_left_from, next_index, *from, *to_next;
upf_main_t *gtm = &upf_main;
vnet_main_t *vnm = gtm->vnet_main;
vnet_interface_main_t *im = &vnm->interface_main;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
u32 thread_index = vlib_get_thread_index ();
u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
u32 sw_if_index = 0;
u32 next = 0;
upf_session_t *sess = NULL;
u32 sidx = 0;
u32 len;
struct rules *active;
next_index = node->cached_next_index;
stats_sw_if_index = node->runtime_data[0];
stats_n_packets = stats_n_bytes = 0;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_buffer_t *b;
u32 error;
u32 bi;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
upf_pdr_t *pdr = NULL;
upf_far_t *far = NULL;
bi = from[0];
to_next[0] = bi;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b = vlib_get_buffer (vm, bi);
UPF_CHECK_INNER_NODE (b);
/* Get next node index and adj index from tunnel next_dpo */
sidx = upf_buffer_opaque (b)->gtpu.session_index;
sess = pool_elt_at_index (gtm->sessions, sidx);
error = 0;
next = UPF_INPUT_NEXT_UPF_FORWARD;
active = pfcp_get_rules (sess, PFCP_ACTIVE);
if (PREDICT_TRUE (upf_buffer_opaque (b)->gtpu.pdr_idx != ~0))
{
pdr =
vec_elt_at_index (active->pdr,
upf_buffer_opaque (b)->gtpu.pdr_idx);
far = pfcp_get_far_by_id (active, pdr->far_id);
}
upf_debug ("IP hdr: %U", format_ip4_header,
vlib_buffer_get_current (b), b->current_length);
upf_debug ("PDR Idx: %u, PDR: %p, FAR: %p",
upf_buffer_opaque (b)->gtpu.pdr_idx, pdr, far);
if (PREDICT_FALSE (!pdr) || PREDICT_FALSE (!far))
goto stats;
upf_debug ("PDR OHR: %u", pdr->outer_header_removal);
/* Outer Header Removal */
switch (pdr->outer_header_removal)
{
case OUTER_HEADER_REMOVAL_GTP_IP4: /* GTP-U/UDP/IPv4 */
if (PREDICT_FALSE
((upf_buffer_opaque (b)->gtpu.flags & BUFFER_HDR_MASK) !=
BUFFER_GTP_UDP_IP4))
{
next = UPF_INPUT_NEXT_DROP;
// error = UPF_INPUT_ERROR_INVALID_OUTER_HEADER;
goto trace;
}
vlib_buffer_advance (b,
upf_buffer_opaque (b)->gtpu.data_offset);
upf_vnet_buffer_l3_hdr_offset_is_current (b);
break;
case OUTER_HEADER_REMOVAL_GTP_IP6: /* GTP-U/UDP/IPv6 */
if (PREDICT_FALSE
((upf_buffer_opaque (b)->gtpu.flags & BUFFER_HDR_MASK) !=
BUFFER_GTP_UDP_IP6))
{
next = UPF_INPUT_NEXT_DROP;
// error = UPF_INPUT_ERROR_INVALID_OUTER_HEADER;
goto trace;
}
vlib_buffer_advance (b,
upf_buffer_opaque (b)->gtpu.data_offset);
upf_vnet_buffer_l3_hdr_offset_is_current (b);
break;
case OUTER_HEADER_REMOVAL_UDP_IP4: /* UDP/IPv4 */
if (PREDICT_FALSE
((upf_buffer_opaque (b)->gtpu.flags & BUFFER_HDR_MASK) !=
BUFFER_UDP_IP4))
{
next = UPF_INPUT_NEXT_DROP;
// error = UPF_INPUT_ERROR_INVALID_OUTER_HEADER;
goto trace;
}
upf_vnet_buffer_l3_hdr_offset_is_current (b);
vlib_buffer_advance (b,
sizeof (ip4_header_t) +
sizeof (udp_header_t));
break;
case OUTER_HEADER_REMOVAL_UDP_IP6: /* UDP/IPv6 */
if (PREDICT_FALSE
((upf_buffer_opaque (b)->gtpu.flags & BUFFER_HDR_MASK) !=
BUFFER_UDP_IP6))
{
next = UPF_INPUT_NEXT_DROP;
// error = UPF_INPUT_ERROR_INVALID_OUTER_HEADER;
goto trace;
}
upf_vnet_buffer_l3_hdr_offset_is_current (b);
vlib_buffer_advance (b,
sizeof (ip6_header_t) +
sizeof (udp_header_t));
break;
case OUTER_HEADER_REMOVAL_GTP: /* GTP-U/UDP/IP */
switch (upf_buffer_opaque (b)->gtpu.flags & BUFFER_HDR_MASK)
{
case BUFFER_GTP_UDP_IP4:
case BUFFER_GTP_UDP_IP6:
vlib_buffer_advance (b,
upf_buffer_opaque (b)->
gtpu.data_offset);
upf_vnet_buffer_l3_hdr_offset_is_current (b);
break;
default:
next = UPF_INPUT_NEXT_DROP;
// error = UPF_INPUT_ERROR_INVALID_OUTER_HEADER;
goto trace;
}
break;
default:
upf_vnet_buffer_l3_hdr_offset_is_current (b);
break;
}
stats:
len = vlib_buffer_length_in_chain (vm, b);
stats_n_packets += 1;
stats_n_bytes += len;
/* Batch stats increment on the same gtpu tunnel so counter is not
incremented per packet. Note stats are still incremented for deleted
and admin-down tunnel where packets are dropped. It is not worthwhile
to check for this rare case and affect normal path performance. */
if (PREDICT_FALSE (sw_if_index != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len;
stats_sw_if_index = sw_if_index;
}
trace:
b->error = error ? node->errors[error] : 0;
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
upf_input_trace_t *tr =
vlib_add_trace (vm, node, b, sizeof (*tr));
tr->session_index = sidx;
tr->cp_seid = sess->cp_seid;
tr->pdr_id = pdr ? pdr->id : ~0;
tr->far_id = far ? far->id : ~0;
clib_memcpy (tr->packet_data, vlib_buffer_get_current (b),
sizeof (tr->packet_data));
}
upf_debug ("Next: %u, Error: %u", next, error);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next, bi, next);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
VLIB_NODE_FN (upf_ip4_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return upf_input (vm, node, from_frame, /* is_ip4 */ 1);
}
VLIB_NODE_FN (upf_ip6_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return upf_input (vm, node, from_frame, /* is_ip4 */ 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (upf_ip4_input_node) = {
.name = "upf-ip4-input",
.vector_size = sizeof (u32),
.format_trace = format_upf_input_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(upf_input_error_strings),
.error_strings = upf_input_error_strings,
.n_next_nodes = UPF_INPUT_N_NEXT,
.next_nodes = {
[UPF_INPUT_NEXT_DROP] = "error-drop",
[UPF_INPUT_NEXT_UPF_FORWARD] = "upf-ip4-forward",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (upf_ip6_input_node) = {
.name = "upf-ip6-input",
.vector_size = sizeof (u32),
.format_trace = format_upf_input_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(upf_input_error_strings),
.error_strings = upf_input_error_strings,
.n_next_nodes = UPF_INPUT_N_NEXT,
.next_nodes = {
[UPF_INPUT_NEXT_DROP] = "error-drop",
[UPF_INPUT_NEXT_UPF_FORWARD] = "upf-ip6-forward",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/