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vpp/src/plugins/gtpu/gtpu_decap.c
Damjan Marion c3148b1be8 misc: remove GNU Indent directives 
Type: refactor
Change-Id: I5235bf3e9aff58af6ba2c14e8c6529c4fc9ec86c
Signed-off-by: Damjan Marion <damarion@cisco.com>
2024-03-12 19:29:56 +00:00

2397 lines
72 KiB
C
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/*
* 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 <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_header_t header;
u8 forwarding_type;
} 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 ", t->tunnel_index);
switch (t->forwarding_type)
{
case GTPU_FORWARD_BAD_HEADER:
s = format (s, "forwarding bad-header ");
break;
case GTPU_FORWARD_UNKNOWN_TEID:
s = format (s, "forwarding unknown-teid ");
break;
case GTPU_FORWARD_UNKNOWN_TYPE:
s = format (s, "forwarding unknown-type ");
break;
}
s = format (s, "teid %u, ", t->teid);
}
else
{
s = format (s, "GTPU decap error - tunnel for teid %u does not exist, ",
t->teid);
}
s = format (s, "next %d error %d, ", t->next_index, t->error);
s = format (s, "flags: 0x%x, type: %d, length: %d", t->header.ver_flags,
t->header.type, t->header.length);
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);
}
// Gets run with every input
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));
// Where is the framevector coming from
from = vlib_frame_vector_args (from_frame);
// number of packets left in frame
n_left_from = from_frame->n_vectors;
// whats the next node it needs to go to
next_index = node->cached_next_index;
// stats from the next interface
stats_sw_if_index = node->runtime_data[0];
// number of packets processed
stats_n_packets = stats_n_bytes = 0;
// run until no more packets left in vectorframe
while (n_left_from > 0)
{
u32 n_left_to_next;
// get vectorframe to process
vlib_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
// while there are still more than 4 packets left in frame and more than
// two packets in current frame
while (n_left_from >= 4 && n_left_to_next >= 2)
{
// buffer index for loading packet data
u32 bi0, bi1;
// vlib packet buffer
vlib_buffer_t * b0, * b1;
// next operation to do with the packet
u32 next0, next1;
// IP4 header type
ip4_header_t *ip4_0, *ip4_1;
ip6_header_t *ip6_0, *ip6_1;
gtpu_header_t *gtpu0, *gtpu1;
i32 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;
udp_header_t *udp0, *udp1;
ip_csum_t sum0, sum1;
u32 old0, old1;
gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 };
gtpu_ext_header_t *ext0, *ext1;
bool is_fast_track0, is_fast_track1;
ext0 = ext1 = &ext;
/* Prefetch next iteration. */
{
vlib_buffer_t * p2, * p3;
// prefetch 3 and 4
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);
}
// getting buffer index from vectorframe
bi0 = from[0];
bi1 = from[1];
// pre inserting the packets for the next node
to_next[0] = bi0;
to_next[1] = bi1;
// forward in vectorframe
from += 2;
// forward next node
to_next += 2;
// decimate message counter for next node
n_left_to_next -= 2;
// decimate message counter for current progessing node
n_left_from -= 2;
// load packets into buffer
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* udp leaves current_data pointing at the gtpu header */
// get pointers to the beginnings of the gtpu frame
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));
}
udp0 = (void *) ((u8 *) gtpu0 - sizeof (udp_header_t));
udp1 = (void *) ((u8 *) gtpu1 - sizeof (udp_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
*/
/* Perform all test assuming the packet has the needed space.
* Check if version 1, not PT, not reserved.
* Check message type 255.
*/
is_fast_track0 =
((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track0 = is_fast_track0 & (gtpu0->type == 255);
is_fast_track1 =
((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track1 = is_fast_track1 & (gtpu1->type == 255);
/* Make the header overlap the end of the gtpu_header_t, so
* that it starts with the same Next extension header as the
* gtpu_header_t.
* This means that the gtpu_ext_header_t (ext) has the type
* from the previous header and the length from the current one.
* Works both for the first gtpu_header_t and all following
* gtpu_ext_header_t extensions.
* Copy the ext data if the E bit is set, else use the 0 value.
*/
ext0 = (ver0 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu0->next_ext_type :
&ext;
ext1 = (ver1 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu1->next_ext_type :
&ext;
/* One or more of the E, S and PN flags are set, so all 3 fields
* must be present:
* The gtpu_header_t contains the Sequence number, N-PDU number and
* Next extension header type.
* If E is not set subtract 4 bytes from the header.
* Then add the length of the extension. 0 * 4 if E is not set,
* else it's the ext->len from the gtp extension. Length is multiple
* of 4 always.
* Note: This length is only valid if the header itself is valid,
* so it must be verified before use.
*/
gtpu_hdr_len0 = sizeof (gtpu_header_t) -
(((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext0->len * 4;
gtpu_hdr_len1 = sizeof (gtpu_header_t) -
(((ver1 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext1->len * 4;
/* Get the next extension, unconditionally.
* If E was not set in the gtp header ext->len is zero.
* If E was set ext0 will now point to the packet buffer.
* If the gtp packet is illegal this might point outside the buffer.
* TBD check the updated for ext0->type != 0, and continue removing
* extensions. Only for clarity, will be optimized away.
*/
ext0 += ext0->len * 4 / sizeof (*ext0);
ext1 += ext1->len * 4 / sizeof (*ext1);
/* Check the space, if this is true then ext0 points to a valid
* location in the buffer as well.
*/
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1);
/* Diverge the packet paths for 0 and 1 */
if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0)))
{
/* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space0)))
{
/* The header or size is wrong */
error0 =
has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
/* This is an unsupported/bad packet.
* Check if it is to be forwarded.
*/
if (is_ip4)
tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv4;
else
tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
goto trace0;
}
/* Correct version and has the space. It can only be unknown
* message type.
*/
error0 = GTPU_ERROR_UNSUPPORTED_TYPE;
next0 = GTPU_INPUT_NEXT_DROP;
/* This is an error/nonstandard packet
* Check if it is to be forwarded. */
if (is_ip4)
tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv4;
else
tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
/* The packet is ipv6/not forwarded */
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 SourceIP and
* teid SourceIP 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;
/* This is a standard packet, but no tunnel was found.
* Check if it is to be forwarded. */
tunnel_index0 =
gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
goto trace0;
}
last_key4.as_u64 = key4_0.as_u64;
tunnel_index0 = last_tunnel_index = p0[0];
}
else // when the address of the packet is the same as the packet
// before ... saving lookup in table
tunnel_index0 = last_tunnel_index;
// tunnel index in vpp
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
goto trace0;
}
/* Validate GTPU tunnel SourceIP against packet DestinationIP */
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
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;
/* This is a standard packet, but no tunnel was found.
* Check if it is to be forwarded. */
tunnel_index0 =
gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward0;
goto trace0;
}
forward0:
/* Get the tunnel */
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_ERROR_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Clear the error, next0 will be overwritten by the tunnel */
error0 = 0;
if (is_ip4)
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len0 =
-(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t));
/* Backup the IP4 checksum and address */
sum0 = ip4_0->checksum;
old0 = ip4_0->dst_address.as_u32;
/* Update IP address of the packet using the src from the tunnel
*/
ip4_0->dst_address.as_u32 = t0->src.ip4.as_u32;
/* Fix the IP4 checksum */
sum0 = ip_csum_update (sum0, old0, ip4_0->dst_address.as_u32,
ip4_header_t,
dst_address /* changed member */);
ip4_0->checksum = ip_csum_fold (sum0);
}
else
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len0 =
-(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t));
/* IPv6 UDP checksum is mandatory */
int bogus = 0;
udp0->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
}
next0:
/* Pop/Remove gtpu header from buffered package or push existing
* IP+UDP header back to the buffer*/
vlib_buffer_advance (b0, gtpu_hdr_len0);
// where does it need to go in the graph next
next0 = t0->decap_next_index;
// interface index the package is on
sw_if_index0 = t0->sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, b0);
// Next three lines are for forwarding the payload to L2
// subinterfaces
/* 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;
// in case its a multicast packet set different interface index
sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0;
// Update stats
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 (vlib_buffer_has_space (b0, 4))
{
tr->header.ver_flags = gtpu0->ver_flags;
tr->header.type = gtpu0->type;
tr->header.length = clib_net_to_host_u16 (gtpu0->length);
}
}
/* End of processing for packet 0, start for packet 1 */
if (PREDICT_FALSE ((!is_fast_track1) | (!has_space1)))
{
/* Not fast path. ext1 and gtpu_hdr_len1 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space1)))
{
/* The header or size is wrong */
error1 =
has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next1 = GTPU_INPUT_NEXT_DROP;
/* This is an unsupported/bad packet.
* Check if it is to be forwarded.
*/
if (is_ip4)
tunnel_index1 = gtm->bad_header_forward_tunnel_index_ipv4;
else
tunnel_index1 = gtm->bad_header_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
goto trace1;
}
/* Correct version and has the space. It can only be unknown
* message type.
*/
error1 = GTPU_ERROR_UNSUPPORTED_TYPE;
next1 = GTPU_INPUT_NEXT_DROP;
/* This is an error/nonstandard packet
* Check if it is to be forwarded. */
if (is_ip4)
tunnel_index1 = gtm->unknown_type_forward_tunnel_index_ipv4;
else
tunnel_index1 = gtm->unknown_type_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
/* The packet is ipv6/not forwarded */
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;
tunnel_index1 =
gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
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;
tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
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;
tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
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;
tunnel_index1 =
gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
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;
tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
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;
tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index1 != ~0))
goto forward1;
goto trace1;
}
forward1:
/* Get the tunnel */
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_ERROR_TUNNEL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Clear the error, next0 will be overwritten by the tunnel */
error1 = 0;
if (is_ip4)
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len1 =
-(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t));
/* Backup the IP4 checksum and address */
sum1 = ip4_1->checksum;
old1 = ip4_1->dst_address.as_u32;
/* Update IP address of the packet using the src from the tunnel
*/
ip4_1->dst_address.as_u32 = t1->src.ip4.as_u32;
/* Fix the IP4 checksum */
sum1 = ip_csum_update (sum1, old1, ip4_1->dst_address.as_u32,
ip4_header_t,
dst_address /* changed member */);
ip4_1->checksum = ip_csum_fold (sum1);
}
else
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len1 =
-(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t));
/* IPv6 UDP checksum is mandatory */
int bogus = 0;
udp1->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip6_1, &bogus);
if (udp1->checksum == 0)
udp1->checksum = 0xffff;
}
next1:
/* Pop gtpu header / push IP+UDP 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;
if (vlib_buffer_has_space (b1, 4))
{
tr->header.ver_flags = gtpu1->ver_flags;
tr->header.type = gtpu1->type;
tr->header.length = clib_net_to_host_u16 (gtpu1->length);
}
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
/* In case there are less than 4 packets left in frame and packets in
current frame aka single processing */
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;
i32 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;
udp_header_t *udp0;
ip_csum_t sum0;
u32 old0;
gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 };
gtpu_ext_header_t *ext0;
bool is_fast_track0;
ext0 = &ext;
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));
}
udp0 = (void *) ((u8 *) gtpu0 - sizeof (udp_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
*/
is_fast_track0 =
((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track0 = is_fast_track0 & (gtpu0->type == 255);
ext0 = (ver0 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu0->next_ext_type :
&ext;
gtpu_hdr_len0 = sizeof (gtpu_header_t) -
(((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext0->len * 4;
ext0 += ext0->len * 4 / sizeof (*ext0);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0)))
{
/* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space0)))
{
/* The header or size is wrong */
error0 =
has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
/* This is an unsupported/bad packet.
* Check if it is to be forwarded.
*/
if (is_ip4)
tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv4;
else
tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
goto trace00;
}
/* Correct version and has the space. It can only be unknown
* message type
*/
error0 = GTPU_ERROR_UNSUPPORTED_TYPE;
next0 = GTPU_INPUT_NEXT_DROP;
/* This is an error/nonstandard packet
* Check if it is to be forwarded. */
if (is_ip4)
tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv4;
else
tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
/* The packet is ipv6/not forwarded */
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))
{
// Cache miss, so try normal lookup now.
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;
/* This is a standard packet, but no tunnel was found.
* Check if it is to be forwarded. */
tunnel_index0 =
gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
goto trace00;
}
// Update the key/tunnel cache for normal packets
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
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;
tunnel_index0 =
gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
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;
tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6;
if (PREDICT_FALSE (tunnel_index0 != ~0))
goto forward00;
goto trace00;
}
/* This can only be reached via goto */
forward00:
// Get the tunnel
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_ERROR_TUNNEL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
/* Clear the error, next0 will be overwritten by the tunnel */
error0 = 0;
if (is_ip4)
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len0 =
-(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t));
/* Backup the IP4 checksum and address */
sum0 = ip4_0->checksum;
old0 = ip4_0->dst_address.as_u32;
/* Update IP address of the packet using the src from the tunnel
*/
ip4_0->dst_address.as_u32 = t0->src.ip4.as_u32;
/* Fix the IP4 checksum */
sum0 = ip_csum_update (sum0, old0, ip4_0->dst_address.as_u32,
ip4_header_t,
dst_address /* changed member */);
ip4_0->checksum = ip_csum_fold (sum0);
}
else
{
/* Forward packet instead. Push the IP+UDP header */
gtpu_hdr_len0 =
-(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t));
/* IPv6 UDP checksum is mandatory */
int bogus = 0;
udp0->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
}
next00:
/* Pop gtpu header / push IP+UDP 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;
if (vlib_buffer_has_space (b0, 4))
{
tr->header.ver_flags = gtpu0->ver_flags;
tr->header.type = gtpu0->type;
tr->header.length = clib_net_to_host_u16 (gtpu0->length);
}
}
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;
/* this function determines if a udp packet is actually gtpu and needs
forwarding to gtpu_input */
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;
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,
&gtm->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,
&gtm->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,
&gtm->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 && \
vnet_buffer (_b)->oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)))
#define gtpu_local_csum_is_valid(_b) \
((_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT || \
(_b->flags & VNET_BUFFER_F_OFFLOAD && \
vnet_buffer (_b)->oflags & VNET_BUFFER_OFFLOAD_F_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;
gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 };
gtpu_ext_header_t *ext0, *ext1;
bool is_fast_track0, is_fast_track1;
ext0 = ext1 = &ext;
/* 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);
/* 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
*/
is_fast_track0 =
((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track0 = is_fast_track0 & (gtpu0->type == 255);
is_fast_track1 =
((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track1 = is_fast_track1 & (gtpu1->type == 255);
ext0 = (ver0 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu0->next_ext_type :
&ext;
ext1 = (ver1 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu1->next_ext_type :
&ext;
gtpu_hdr_len0 = sizeof (gtpu_header_t) -
(((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext0->len * 4;
gtpu_hdr_len1 = sizeof (gtpu_header_t) -
(((ver1 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext1->len * 4;
/* Only for clarity, will be optimized away */
ext0 += ext0->len * 4 / sizeof (*ext0);
ext1 += ext1->len * 4 / sizeof (*ext1);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1);
if (ip_err0 || udp_err0 || csum_err0)
{
next0 = GTPU_INPUT_NEXT_DROP;
error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0);
goto trace0;
}
/* Diverge the packet paths for 0 and 1 */
if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0)))
{
/* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space0)))
{
/* The header or size is wrong */
error0 =
has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace0;
}
/* Correct version and has the space. It can only be unknown
* message type.
*/
error0 = GTPU_ERROR_UNSUPPORTED_TYPE;
next0 = GTPU_INPUT_NEXT_DROP;
/* The packet is not forwarded */
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 (vlib_buffer_has_space (b0, 4))
{
tr->header.ver_flags = gtpu0->ver_flags;
tr->header.type = gtpu0->type;
tr->header.length = clib_net_to_host_u16 (gtpu0->length);
}
}
if (ip_err1 || udp_err1 || csum_err1)
{
next1 = GTPU_INPUT_NEXT_DROP;
error1 = gtpu_err_code (ip_err1, udp_err1, csum_err1);
goto trace1;
}
/*
* Manipulate gtpu header
* TBD: Manipulate Sequence Number and N-PDU Number
* TBD: Manipulate Next Extension Header
*/
if (PREDICT_FALSE ((!is_fast_track1) | (!has_space1)))
{
/* Not fast path. ext1 and gtpu_hdr_len1 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space1)))
{
/* The header or size is wrong */
error1 =
has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next1 = GTPU_INPUT_NEXT_DROP;
goto trace1;
}
/* Correct version and has the space. It can only be unknown
* message type.
*/
error1 = GTPU_ERROR_UNSUPPORTED_TYPE;
next1 = GTPU_INPUT_NEXT_DROP;
/* The packet is not forwarded */
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;
if (vlib_buffer_has_space (b1, 4))
{
tr->header.ver_flags = gtpu1->ver_flags;
tr->header.type = gtpu1->type;
tr->header.length = clib_net_to_host_u16 (gtpu1->length);
}
}
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;
gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 };
gtpu_ext_header_t *ext0;
bool is_fast_track0;
ext0 = &ext;
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);
/* 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
*/
is_fast_track0 =
((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT));
is_fast_track0 = is_fast_track0 & (gtpu0->type == 255);
ext0 = (ver0 & GTPU_E_BIT) ?
(gtpu_ext_header_t *) &gtpu0->next_ext_type :
&ext;
gtpu_hdr_len0 = sizeof (gtpu_header_t) -
(((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) +
ext0->len * 4;
ext0 += ext0->len * 4 / sizeof (*ext0);
has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0);
if (ip_err0 || udp_err0 || csum_err0)
{
next0 = GTPU_INPUT_NEXT_DROP;
error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0);
goto trace00;
}
if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0)))
{
/* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */
/* GCC will hopefully fix the duplicate compute */
if (PREDICT_FALSE (
!((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) ==
(GTPU_V1_VER | GTPU_PT_BIT)) |
(!has_space0)))
{
/* The header or size is wrong */
error0 =
has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL;
next0 = GTPU_INPUT_NEXT_DROP;
goto trace00;
}
/* Correct version and has the space. It can only be unknown
* message type.
*/
error0 = GTPU_ERROR_UNSUPPORTED_TYPE;
next0 = GTPU_INPUT_NEXT_DROP;
/* The packet is not forwarded */
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;
if (vlib_buffer_has_space (b0, 4))
{
tr->header.ver_flags = gtpu0->ver_flags;
tr->header.type = gtpu0->type;
tr->header.length = clib_net_to_host_u16 (gtpu0->length);
}
}
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);
}
#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
#endif /* CLIB_MARCH_VARIANT */
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