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gerrit.nordix.org / fdio / vpp / 5e52417a2aa3b2063a811c6a9f293a79d73bcb43 / . / src / plugins / gtpu / gtpu_decap.c
blob: 7a88aae63a641787ec4624b9e7b62659e7a1a407 [file] [log] [blame]
/*
* decap.c: gtpu tunnel decap packet processing
*
* Copyright (c) 2017 Intel 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 <gtpu/gtpu.h>
extern vlib_node_registration_t gtpu4_input_node;
extern vlib_node_registration_t gtpu6_input_node;
typedef struct {
u32 next_index;
u32 tunnel_index;
u32 error;
u32 teid;
} gtpu_rx_trace_t;
static u8 * format_gtpu_rx_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 *);
gtpu_rx_trace_t * t = va_arg (*args, gtpu_rx_trace_t *);
if (t->tunnel_index != ~0)
{
s = format (s, "GTPU decap from gtpu_tunnel%d teid %d next %d error %d",
t->tunnel_index, t->teid, t->next_index, t->error);
}
else
{
s = format (s, "GTPU decap error - tunnel for teid %d does not exist",
t->teid);
}
return s;
}
always_inline u32
validate_gtpu_fib (vlib_buffer_t *b, gtpu_tunnel_t *t, u32 is_ip4)
{
return t->encap_fib_index == vlib_buffer_get_ip_fib_index (b, is_ip4);
}
always_inline uword
gtpu_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame,
u32 is_ip4)
{
u32 n_left_from, next_index, * from, * to_next;
gtpu_main_t * gtm = &gtpu_main;
vnet_main_t * vnm = gtm->vnet_main;
vnet_interface_main_t * im = &vnm->interface_main;
u32 last_tunnel_index = ~0;
gtpu4_tunnel_key_t last_key4;
gtpu6_tunnel_key_t last_key6;
u32 pkts_decapsulated = 0;
u32 thread_index = vlib_get_thread_index();
u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
if (is_ip4)
last_key4.as_u64 = ~0;
else
clib_memset (&last_key6, 0xff, sizeof (last_key6));
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
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_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t * b0, * b1;
u32 next0, next1;
ip4_header_t * ip4_0, * ip4_1;
ip6_header_t * ip6_0, * ip6_1;
gtpu_header_t * gtpu0, * gtpu1;
u32 gtpu_hdr_len0, gtpu_hdr_len1;
uword * p0, * p1;
u32 tunnel_index0, tunnel_index1;
gtpu_tunnel_t * t0, * t1, * mt0 = NULL, * mt1 = NULL;
gtpu4_tunnel_key_t key4_0, key4_1;
gtpu6_tunnel_key_t key6_0, key6_1;
u32 error0, error1;
u32 sw_if_index0, sw_if_index1, len0, len1;
u8 has_space0, has_space1;
u8 ver0, ver1;
/* Prefetch next iteration. */
{
vlib_buffer_t * p2, * p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = from[0];
bi1 = from[1];
to_next[0] = bi0;
to_next[1] = bi1;
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* udp leaves current_data pointing at the gtpu header */
gtpu0 = vlib_buffer_get_current (b0);
gtpu1 = vlib_buffer_get_current (b1);
if (is_ip4)
{
ip4_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip4_header_t));
ip4_1 = (void *)((u8*)gtpu1 - sizeof(udp_header_t) - sizeof(ip4_header_t));
}
else
{
ip6_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip6_header_t));
ip6_1 = (void *)((u8*)gtpu1 - sizeof(udp_header_t) - sizeof(ip6_header_t));
}
tunnel_index0 = ~0;
error0 = 0;
tunnel_index1 = ~0;
error1 = 0;
/* speculatively load gtp header version field */
ver0 = gtpu0->ver_flags;
ver1 = gtpu1->ver_flags;
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4);
gtpu_hdr_len1 = sizeof(gtpu_header_t) - (((ver1 & GTPU_E_S_PN_BIT) == 0) * 4);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1);
if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0)))
{
error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Manipulate packet 0 */
if (is_ip4) {
key4_0.src = ip4_0->src_address.as_u32;
key4_0.teid = gtpu0->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
{
p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
if (PREDICT_FALSE (p0 == NULL))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
last_key4.as_u64 = key4_0.as_u64;
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
goto next0; /* valid packet */
if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address)))
{
key4_0.src = ip4_0->dst_address.as_u32;
key4_0.teid = gtpu0->teid;
/* Make sure mcast GTPU tunnel exist by packet DIP and teid */
p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
if (PREDICT_TRUE (p0 != NULL))
{
mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
goto next0; /* valid packet */
}
}
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
} else /* !is_ip4 */ {
key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0];
key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1];
key6_0.teid = gtpu0->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0))
{
p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
if (PREDICT_FALSE (p0 == NULL))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
clib_memcpy_fast (&last_key6, &key6_0, sizeof(key6_0));
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
&t0->src.ip6)))
goto next0; /* valid packet */
if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address)))
{
key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0];
key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1];
key6_0.teid = gtpu0->teid;
p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
if (PREDICT_TRUE (p0 != NULL))
{
mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
goto next0; /* valid packet */
}
}
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
next0:
/* Pop gtpu header */
vlib_buffer_advance (b0, gtpu_hdr_len0);
next0 = t0->decap_next_index;
sw_if_index0 = t0->sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, b0);
/* Required to make the l2 tag push / pop code work on l2 subifs */
if (PREDICT_TRUE(next0 == GTPU_INPUT_NEXT_L2_INPUT))
vnet_update_l2_len (b0);
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len0;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace0:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_index0;
tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0;
}
if (PREDICT_FALSE (((ver1 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space1)))
{
error1 = has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Manipulate packet 1 */
if (is_ip4) {
key4_1.src = ip4_1->src_address.as_u32;
key4_1.teid = gtpu1->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64))
{
p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64);
if (PREDICT_FALSE (p1 == NULL))
{
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
last_key4.as_u64 = key4_1.as_u64;
tunnel_index1 = last_tunnel_index = p1[0];
}
else
tunnel_index1 = last_tunnel_index;
t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0))
{
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip4_1->dst_address.as_u32 == t1->src.ip4.as_u32))
goto next1; /* valid packet */
if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_1->dst_address)))
{
key4_1.src = ip4_1->dst_address.as_u32;
key4_1.teid = gtpu1->teid;
/* Make sure mcast GTPU tunnel exist by packet DIP and teid */
p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64);
if (PREDICT_TRUE (p1 != NULL))
{
mt1 = pool_elt_at_index (gtm->tunnels, p1[0]);
goto next1; /* valid packet */
}
}
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
} else /* !is_ip4 */ {
key6_1.src.as_u64[0] = ip6_1->src_address.as_u64[0];
key6_1.src.as_u64[1] = ip6_1->src_address.as_u64[1];
key6_1.teid = gtpu1->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (memcmp(&key6_1, &last_key6, sizeof(last_key6)) != 0))
{
p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1);
if (PREDICT_FALSE (p1 == NULL))
{
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
clib_memcpy_fast (&last_key6, &key6_1, sizeof(key6_1));
tunnel_index1 = last_tunnel_index = p1[0];
}
else
tunnel_index1 = last_tunnel_index;
t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0))
{
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address,
&t1->src.ip6)))
goto next1; /* valid packet */
if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_1->dst_address)))
{
key6_1.src.as_u64[0] = ip6_1->dst_address.as_u64[0];
key6_1.src.as_u64[1] = ip6_1->dst_address.as_u64[1];
key6_1.teid = gtpu1->teid;
p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1);
if (PREDICT_TRUE (p1 != NULL))
{
mt1 = pool_elt_at_index (gtm->tunnels, p1[0]);
goto next1; /* valid packet */
}
}
error1 = GTPU_ERROR_NO_SUCH_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
next1:
/* Pop gtpu header */
vlib_buffer_advance (b1, gtpu_hdr_len1);
next1 = t1->decap_next_index;
sw_if_index1 = t1->sw_if_index;
len1 = vlib_buffer_length_in_chain (vm, b1);
/* Required to make the l2 tag push / pop code work on l2 subifs */
if (PREDICT_TRUE(next1 == GTPU_INPUT_NEXT_L2_INPUT))
vnet_update_l2_len (b1);
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len1;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len1;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len1;
stats_sw_if_index = sw_if_index1;
}
trace1:
b1->error = error1 ? node->errors[error1] : 0;
if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b1, sizeof (*tr));
tr->next_index = next1;
tr->error = error1;
tr->tunnel_index = tunnel_index1;
tr->teid = has_space1 ? clib_net_to_host_u32(gtpu1->teid) : ~0;
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t * b0;
u32 next0;
ip4_header_t * ip4_0;
ip6_header_t * ip6_0;
gtpu_header_t * gtpu0;
u32 gtpu_hdr_len0;
uword * p0;
u32 tunnel_index0;
gtpu_tunnel_t * t0, * mt0 = NULL;
gtpu4_tunnel_key_t key4_0;
gtpu6_tunnel_key_t key6_0;
u32 error0;
u32 sw_if_index0, len0;
u8 has_space0;
u8 ver0;
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);
/* udp leaves current_data pointing at the gtpu header */
gtpu0 = vlib_buffer_get_current (b0);
if (is_ip4) {
ip4_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip4_header_t));
} else {
ip6_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip6_header_t));
}
tunnel_index0 = ~0;
error0 = 0;
/* speculatively load gtp header version field */
ver0 = gtpu0->ver_flags;
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0)))
{
error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
if (is_ip4) {
key4_0.src = ip4_0->src_address.as_u32;
key4_0.teid = gtpu0->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64))
{
p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
if (PREDICT_FALSE (p0 == NULL))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
last_key4.as_u64 = key4_0.as_u64;
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
goto next00; /* valid packet */
if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address)))
{
key4_0.src = ip4_0->dst_address.as_u32;
key4_0.teid = gtpu0->teid;
/* Make sure mcast GTPU tunnel exist by packet DIP and teid */
p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64);
if (PREDICT_TRUE (p0 != NULL))
{
mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
goto next00; /* valid packet */
}
}
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
} else /* !is_ip4 */ {
key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0];
key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1];
key6_0.teid = gtpu0->teid;
/* Make sure GTPU tunnel exist according to packet SIP and teid
* SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */
if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0))
{
p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
if (PREDICT_FALSE (p0 == NULL))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
clib_memcpy_fast (&last_key6, &key6_0, sizeof(key6_0));
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
/* Validate GTPU tunnel encap-fib index against packet */
if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0))
{
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
/* Validate GTPU tunnel SIP against packet DIP */
if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address,
&t0->src.ip6)))
goto next00; /* valid packet */
if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address)))
{
key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0];
key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1];
key6_0.teid = gtpu0->teid;
p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0);
if (PREDICT_TRUE (p0 != NULL))
{
mt0 = pool_elt_at_index (gtm->tunnels, p0[0]);
goto next00; /* valid packet */
}
}
error0 = GTPU_ERROR_NO_SUCH_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
next00:
/* Pop gtpu header */
vlib_buffer_advance (b0, gtpu_hdr_len0);
next0 = t0->decap_next_index;
sw_if_index0 = t0->sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, b0);
/* Required to make the l2 tag push / pop code work on l2 subifs */
if (PREDICT_TRUE(next0 == GTPU_INPUT_NEXT_L2_INPUT))
vnet_update_l2_len (b0);
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len0;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace00:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_index0;
tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0;
}
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);
}
/* Do we still need this now that tunnel tx stats is kept? */
vlib_node_increment_counter (vm, is_ip4?
gtpu4_input_node.index:gtpu6_input_node.index,
GTPU_ERROR_DECAPSULATED,
pkts_decapsulated);
/* Increment any remaining batch stats */
if (stats_n_packets)
{
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
node->runtime_data[0] = stats_sw_if_index;
}
return from_frame->n_vectors;
}
VLIB_NODE_FN (gtpu4_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return gtpu_input(vm, node, from_frame, /* is_ip4 */ 1);
}
VLIB_NODE_FN (gtpu6_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return gtpu_input(vm, node, from_frame, /* is_ip4 */ 0);
}
static char * gtpu_error_strings[] = {
#define gtpu_error(n,s) s,
#include <gtpu/gtpu_error.def>
#undef gtpu_error
#undef _
};
VLIB_REGISTER_NODE (gtpu4_input_node) = {
.name = "gtpu4-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = GTPU_N_ERROR,
.error_strings = gtpu_error_strings,
.n_next_nodes = GTPU_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [GTPU_INPUT_NEXT_##s] = n,
foreach_gtpu_input_next
#undef _
},
//temp .format_buffer = format_gtpu_header,
.format_trace = format_gtpu_rx_trace,
// $$$$ .unformat_buffer = unformat_gtpu_header,
};
VLIB_REGISTER_NODE (gtpu6_input_node) = {
.name = "gtpu6-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = GTPU_N_ERROR,
.error_strings = gtpu_error_strings,
.n_next_nodes = GTPU_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [GTPU_INPUT_NEXT_##s] = n,
foreach_gtpu_input_next
#undef _
},
//temp .format_buffer = format_gtpu_header,
.format_trace = format_gtpu_rx_trace,
// $$$$ .unformat_buffer = unformat_gtpu_header,
};
typedef enum {
IP_GTPU_BYPASS_NEXT_DROP,
IP_GTPU_BYPASS_NEXT_GTPU,
IP_GTPU_BYPASS_N_NEXT,
} ip_vxan_bypass_next_t;
always_inline uword
ip_gtpu_bypass_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
u32 is_ip4)
{
gtpu_main_t * gtm = &gtpu_main;
u32 * from, * to_next, n_left_from, n_left_to_next, next_index;
vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
vtep4_key_t last_vtep4; /* last IPv4 address / fib index
matching a local VTEP address */
vtep6_key_t last_vtep6; /* last IPv6 address / fib index
matching a local VTEP address */
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
#ifdef CLIB_HAVE_VEC512
vtep4_cache_t vtep4_u512;
clib_memset (&vtep4_u512, 0, sizeof (vtep4_u512));
#endif
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
vlib_get_buffers (vm, from, bufs, n_left_from);
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip4_forward_next_trace (vm, node, frame, VLIB_TX);
if (is_ip4)
vtep4_key_init (&last_vtep4);
else
vtep6_key_init (&last_vtep6);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
vlib_buffer_t * b0, * b1;
ip4_header_t * ip40, * ip41;
ip6_header_t * ip60, * ip61;
udp_header_t * udp0, * udp1;
u32 bi0, ip_len0, udp_len0, flags0, next0;
u32 bi1, ip_len1, udp_len1, flags1, next1;
i32 len_diff0, len_diff1;
u8 error0, good_udp0, proto0;
u8 error1, good_udp1, proto1;
/* Prefetch next iteration. */
{
vlib_prefetch_buffer_header (b[2], LOAD);
vlib_prefetch_buffer_header (b[3], LOAD);
CLIB_PREFETCH (b[2]->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (b[3]->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = to_next[0] = from[0];
bi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
b0 = b[0];
b1 = b[1];
b += 2;
if (is_ip4)
{
ip40 = vlib_buffer_get_current (b0);
ip41 = vlib_buffer_get_current (b1);
}
else
{
ip60 = vlib_buffer_get_current (b0);
ip61 = vlib_buffer_get_current (b1);
}
/* Setup packet for next IP feature */
vnet_feature_next(&next0, b0);
vnet_feature_next(&next1, b1);
if (is_ip4)
{
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol;
proto1 = ip4_is_fragment(ip41) ? 0xfe : ip41->protocol;
}
else
{
proto0 = ip60->protocol;
proto1 = ip61->protocol;
}
/* Process packet 0 */
if (proto0 != IP_PROTOCOL_UDP)
goto exit0; /* not UDP packet */
if (is_ip4)
udp0 = ip4_next_header (ip40);
else
udp0 = ip6_next_header (ip60);
if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU))
goto exit0; /* not GTPU packet */
/* Validate DIP against VTEPs*/
if (is_ip4)
{
#ifdef CLIB_HAVE_VEC512
if (!vtep4_check_vector
(&gtm->vtep_table, b0, ip40, &last_vtep4, &vtep4_u512))
#else
if (!vtep4_check (&gtm->vtep_table, b0, ip40, &last_vtep4))
#endif
goto exit0; /* no local VTEP for GTPU packet */
}
else
{
if (!vtep6_check (&gtm->vtep_table, b0, ip60, &last_vtep6))
goto exit0; /* no local VTEP for GTPU packet */
}
flags0 = b0->flags;
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp0 |= udp0->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len0 = clib_net_to_host_u16 (ip40->length);
else
ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp0))
{
if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
else
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
good_udp0 =
(flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
}
else
{
error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
}
next0 = error0 ?
IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
b0->error = error0 ? error_node->errors[error0] : 0;
/* gtpu-input node expect current at GTPU header */
if (is_ip4)
vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t));
else
vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t));
exit0:
/* Process packet 1 */
if (proto1 != IP_PROTOCOL_UDP)
goto exit1; /* not UDP packet */
if (is_ip4)
udp1 = ip4_next_header (ip41);
else
udp1 = ip6_next_header (ip61);
if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU))
goto exit1; /* not GTPU packet */
/* Validate DIP against VTEPs*/
if (is_ip4)
{
#ifdef CLIB_HAVE_VEC512
if (!vtep4_check_vector
(&gtm->vtep_table, b1, ip41, &last_vtep4, &vtep4_u512))
#else
if (!vtep4_check (&gtm->vtep_table, b1, ip41, &last_vtep4))
#endif
goto exit1; /* no local VTEP for GTPU packet */
}
else
{
if (!vtep6_check (&gtm->vtep_table, b1, ip61, &last_vtep6))
goto exit1; /* no local VTEP for GTPU packet */
}
flags1 = b1->flags;
good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp1 |= udp1->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len1 = clib_net_to_host_u16 (ip41->length);
else
ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
udp_len1 = clib_net_to_host_u16 (udp1->length);
len_diff1 = ip_len1 - udp_len1;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp1))
{
if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
else
flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
good_udp1 =
(flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
}
else
{
error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
}
next1 = error1 ?
IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
b1->error = error1 ? error_node->errors[error1] : 0;
/* gtpu-input node expect current at GTPU header */
if (is_ip4)
vlib_buffer_advance (b1, sizeof(ip4_header_t)+sizeof(udp_header_t));
else
vlib_buffer_advance (b1, sizeof(ip6_header_t)+sizeof(udp_header_t));
exit1:
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t * b0;
ip4_header_t * ip40;
ip6_header_t * ip60;
udp_header_t * udp0;
u32 bi0, ip_len0, udp_len0, flags0, next0;
i32 len_diff0;
u8 error0, good_udp0, proto0;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
b0 = b[0];
b++;
if (is_ip4)
ip40 = vlib_buffer_get_current (b0);
else
ip60 = vlib_buffer_get_current (b0);
/* Setup packet for next IP feature */
vnet_feature_next(&next0, b0);
if (is_ip4)
/* Treat IP4 frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol;
else
proto0 = ip60->protocol;
if (proto0 != IP_PROTOCOL_UDP)
goto exit; /* not UDP packet */
if (is_ip4)
udp0 = ip4_next_header (ip40);
else
udp0 = ip6_next_header (ip60);
if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU))
goto exit; /* not GTPU packet */
/* Validate DIP against VTEPs*/
if (is_ip4)
{
#ifdef CLIB_HAVE_VEC512
if (!vtep4_check_vector
(&gtm->vtep_table, b0, ip40, &last_vtep4, &vtep4_u512))
#else
if (!vtep4_check (&gtm->vtep_table, b0, ip40, &last_vtep4))
#endif
goto exit; /* no local VTEP for GTPU packet */
}
else
{
if (!vtep6_check (&gtm->vtep_table, b0, ip60, &last_vtep6))
goto exit; /* no local VTEP for GTPU packet */
}
flags0 = b0->flags;
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp0 |= udp0->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len0 = clib_net_to_host_u16 (ip40->length);
else
ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp0))
{
if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
else
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
good_udp0 =
(flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
}
else
{
error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
}
next0 = error0 ?
IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU;
b0->error = error0 ? error_node->errors[error0] : 0;
/* gtpu-input node expect current at GTPU header */
if (is_ip4)
vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t));
else
vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t));
exit:
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;
}
VLIB_NODE_FN (ip4_gtpu_bypass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
}
VLIB_REGISTER_NODE (ip4_gtpu_bypass_node) = {
.name = "ip4-gtpu-bypass",
.vector_size = sizeof (u32),
.n_next_nodes = IP_GTPU_BYPASS_N_NEXT,
.next_nodes = {
[IP_GTPU_BYPASS_NEXT_DROP] = "error-drop",
[IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu4-input",
},
.format_buffer = format_ip4_header,
.format_trace = format_ip4_forward_next_trace,
};
#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t * ip4_gtpu_bypass_init (vlib_main_t * vm)
{ return 0; }
VLIB_INIT_FUNCTION (ip4_gtpu_bypass_init);
#endif /* CLIB_MARCH_VARIANT */
VLIB_NODE_FN (ip6_gtpu_bypass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
}
VLIB_REGISTER_NODE (ip6_gtpu_bypass_node) = {
.name = "ip6-gtpu-bypass",
.vector_size = sizeof (u32),
.n_next_nodes = IP_GTPU_BYPASS_N_NEXT,
.next_nodes = {
[IP_GTPU_BYPASS_NEXT_DROP] = "error-drop",
[IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu6-input",
},
.format_buffer = format_ip6_header,
.format_trace = format_ip6_forward_next_trace,
};
#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t * ip6_gtpu_bypass_init (vlib_main_t * vm)
{ return 0; }
VLIB_INIT_FUNCTION (ip6_gtpu_bypass_init);
#define foreach_gtpu_flow_error \
_(NONE, "no error") \
_(PAYLOAD_ERROR, "Payload type errors") \
_(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \
_(IP_HEADER_ERROR, "Rx ip header errors") \
_(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \
_(UDP_LENGTH_ERROR, "Rx udp length errors")
typedef enum
{
#define _(f,s) GTPU_FLOW_ERROR_##f,
foreach_gtpu_flow_error
#undef _
#define gtpu_error(n,s) GTPU_FLOW_ERROR_##n,
#include <gtpu/gtpu_error.def>
#undef gtpu_error
GTPU_FLOW_N_ERROR,
} gtpu_flow_error_t;
static char *gtpu_flow_error_strings[] = {
#define _(n,s) s,
foreach_gtpu_flow_error
#undef _
#define gtpu_error(n,s) s,
#include <gtpu/gtpu_error.def>
#undef gtpu_error
#undef _
};
#define gtpu_local_need_csum_check(_b) \
(!(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
|| _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
#define gtpu_local_csum_is_valid(_b) \
((_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
|| _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) != 0)
static_always_inline u8
gtpu_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t *b)
{
u32 flags = b->flags;
enum { offset = sizeof(ip4_header_t) + sizeof(udp_header_t)};
/* Verify UDP checksum */
if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
vlib_buffer_advance (b, -offset);
flags = ip4_tcp_udp_validate_checksum (vm, b);
vlib_buffer_advance (b, offset);
}
return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
static_always_inline u8
gtpu_check_ip (vlib_buffer_t *b, u16 payload_len)
{
ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) -
sizeof(ip4_header_t) - sizeof(udp_header_t);
u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length);
u16 expected = payload_len + sizeof(ip4_header_t) + sizeof(udp_header_t);
return ip_len > expected || ip4_hdr->ttl == 0 || ip4_hdr->ip_version_and_header_length != 0x45;
}
static_always_inline u8
gtpu_check_ip_udp_len (vlib_buffer_t *b)
{
ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) -
sizeof(ip4_header_t) - sizeof(udp_header_t);
udp_header_t * udp_hdr = vlib_buffer_get_current(b) - sizeof(udp_header_t);
u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length);
u16 udp_len = clib_net_to_host_u16 (udp_hdr->length);
return udp_len > ip_len;
}
static_always_inline u8
gtpu_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0)
{
u8 error0 = GTPU_FLOW_ERROR_NONE;
if (ip_err0)
error0 = GTPU_FLOW_ERROR_IP_HEADER_ERROR;
if (udp_err0)
error0 = GTPU_FLOW_ERROR_UDP_LENGTH_ERROR;
if (csum_err0)
error0 = GTPU_FLOW_ERROR_UDP_CHECKSUM_ERROR;
return error0;
}
always_inline uword
gtpu_flow_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, * from, * to_next;
gtpu_main_t * gtm = &gtpu_main;
vnet_main_t * vnm = gtm->vnet_main;
vnet_interface_main_t * im = &vnm->interface_main;
u32 pkts_decapsulated = 0;
u32 thread_index = vlib_get_thread_index();
u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
u8 ip_err0, ip_err1, udp_err0, udp_err1, csum_err0, csum_err1;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
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_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t * b0, * b1;
u32 next0, next1;
gtpu_header_t * gtpu0, * gtpu1;
u32 gtpu_hdr_len0, gtpu_hdr_len1;
u32 tunnel_index0, tunnel_index1;
gtpu_tunnel_t * t0, * t1;
u32 error0, error1;
u32 sw_if_index0, sw_if_index1, len0, len1;
u8 has_space0 = 0, has_space1 = 0;
u8 ver0, ver1;
/* Prefetch next iteration. */
{
vlib_buffer_t * p2, * p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = from[0];
bi1 = from[1];
to_next[0] = bi0;
to_next[1] = bi1;
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* udp leaves current_data pointing at the gtpu header */
gtpu0 = vlib_buffer_get_current (b0);
gtpu1 = vlib_buffer_get_current (b1);
len0 = vlib_buffer_length_in_chain (vm, b0);
len1 = vlib_buffer_length_in_chain (vm, b1);
tunnel_index0 = ~0;
error0 = 0;
tunnel_index1 = ~0;
error1 = 0;
ip_err0 = gtpu_check_ip (b0, len0);
udp_err0 = gtpu_check_ip_udp_len (b0);
ip_err1 = gtpu_check_ip (b1, len1);
udp_err1 = gtpu_check_ip_udp_len (b1);
if (PREDICT_FALSE (gtpu_local_need_csum_check (b0)))
csum_err0 = !gtpu_validate_udp_csum (vm, b0);
else
csum_err0 = !gtpu_local_csum_is_valid (b0);
if (PREDICT_FALSE (gtpu_local_need_csum_check (b1)))
csum_err1 = !gtpu_validate_udp_csum (vm, b1);
else
csum_err1 = !gtpu_local_csum_is_valid (b1);
if (ip_err0 || udp_err0 || csum_err0)
{
next0 = GTPU_INPUT_NEXT_DROP;
error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0);
goto trace0;
}
/* speculatively load gtp header version field */
ver0 = gtpu0->ver_flags;
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0)))
{
error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Manipulate packet 0 */
ASSERT (b0->flow_id != 0);
tunnel_index0 = b0->flow_id - gtm->flow_id_start;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
b0->flow_id = 0;
/* Pop gtpu header */
vlib_buffer_advance (b0, gtpu_hdr_len0);
/* assign the next node */
if (PREDICT_FALSE (t0->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) &&
(t0->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT))
{
error0 = GTPU_FLOW_ERROR_PAYLOAD_ERROR;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
next0 = t0->decap_next_index;
sw_if_index0 = t0->sw_if_index;
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len0;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace0:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_index0;
tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0;
}
if (ip_err1 || udp_err1 || csum_err1)
{
next1 = GTPU_INPUT_NEXT_DROP;
error1 = gtpu_err_code (ip_err1, udp_err1, csum_err1);
goto trace1;
}
/* speculatively load gtp header version field */
ver1 = gtpu1->ver_flags;
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
gtpu_hdr_len1 = sizeof(gtpu_header_t) - (((ver1 & GTPU_E_S_PN_BIT) == 0) * 4);
has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1);
if (PREDICT_FALSE (((ver1 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space1)))
{
error1 = has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Manipulate packet 1 */
ASSERT (b1->flow_id != 0);
tunnel_index1 = b1->flow_id - gtm->flow_id_start;
t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1);
b1->flow_id = 0;
/* Pop gtpu header */
vlib_buffer_advance (b1, gtpu_hdr_len1);
/* assign the next node */
if (PREDICT_FALSE (t1->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) &&
(t1->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT))
{
error1 = GTPU_FLOW_ERROR_PAYLOAD_ERROR;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
next1 = t1->decap_next_index;
sw_if_index1 = t1->sw_if_index;
/* Required to make the l2 tag push / pop code work on l2 subifs */
/* This won't happen in current implementation as only
ipv4/udp/gtpu/IPV4 type packets can be matched */
if (PREDICT_FALSE(next1 == GTPU_INPUT_NEXT_L2_INPUT))
vnet_update_l2_len (b1);
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len1;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len1;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len1;
stats_sw_if_index = sw_if_index1;
}
trace1:
b1->error = error1 ? node->errors[error1] : 0;
if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b1, sizeof (*tr));
tr->next_index = next1;
tr->error = error1;
tr->tunnel_index = tunnel_index1;
tr->teid = has_space1 ? clib_net_to_host_u32(gtpu1->teid) : ~0;
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t * b0;
u32 next0;
gtpu_header_t * gtpu0;
u32 gtpu_hdr_len0;
u32 error0;
u32 tunnel_index0;
gtpu_tunnel_t * t0;
u32 sw_if_index0, len0;
u8 has_space0 = 0;
u8 ver0;
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);
len0 = vlib_buffer_length_in_chain (vm, b0);
tunnel_index0 = ~0;
error0 = 0;
ip_err0 = gtpu_check_ip (b0, len0);
udp_err0 = gtpu_check_ip_udp_len (b0);
if (PREDICT_FALSE (gtpu_local_need_csum_check (b0)))
csum_err0 = !gtpu_validate_udp_csum (vm, b0);
else
csum_err0 = !gtpu_local_csum_is_valid (b0);
if (ip_err0 || udp_err0 || csum_err0)
{
next0 = GTPU_INPUT_NEXT_DROP;
error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0);
goto trace00;
}
/* udp leaves current_data pointing at the gtpu header */
gtpu0 = vlib_buffer_get_current (b0);
/* speculatively load gtp header version field */
ver0 = gtpu0->ver_flags;
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0)))
{
error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
ASSERT (b0->flow_id != 0);
tunnel_index0 = b0->flow_id - gtm->flow_id_start;
t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0);
b0->flow_id = 0;
/* Pop gtpu header */
vlib_buffer_advance (b0, gtpu_hdr_len0);
/* assign the next node */
if (PREDICT_FALSE (t0->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) &&
(t0->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT))
{
error0 = GTPU_FLOW_ERROR_PAYLOAD_ERROR;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
next0 = t0->decap_next_index;
sw_if_index0 = t0->sw_if_index;
/* Set packet input sw_if_index to unicast GTPU tunnel for learning */
vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
pkts_decapsulated ++;
stats_n_packets += 1;
stats_n_bytes += len0;
/* Batch stats increment on the same gtpu tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace00:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
gtpu_rx_trace_t *tr
= vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_index0;
tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0;
}
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);
}
/* Do we still need this now that tunnel tx stats is kept? */
vlib_node_increment_counter (vm, gtpu4_flow_input_node.index,
GTPU_ERROR_DECAPSULATED,
pkts_decapsulated);
/* Increment any remaining batch stats */
if (stats_n_packets)
{
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
node->runtime_data[0] = stats_sw_if_index;
}
return from_frame->n_vectors;
}
VLIB_NODE_FN (gtpu4_flow_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return gtpu_flow_input(vm, node, from_frame);
}
/* *INDENT-OFF* */
#ifndef CLIB_MULTIARCH_VARIANT
VLIB_REGISTER_NODE (gtpu4_flow_input_node) = {
.name = "gtpu4-flow-input",
.type = VLIB_NODE_TYPE_INTERNAL,
.vector_size = sizeof (u32),
.format_trace = format_gtpu_rx_trace,
.n_errors = GTPU_FLOW_N_ERROR,
.error_strings = gtpu_flow_error_strings,
.n_next_nodes = GTPU_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [GTPU_INPUT_NEXT_##s] = n,
foreach_gtpu_input_next
#undef _
},
};
#endif
/* *INDENT-ON* */
#endif /* CLIB_MARCH_VARIANT */