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01fe7ab88efe1771618358ee5e90f56996ba909e
vpp/src/plugins/af_packet/node.c
Artem Glazychev 8beddaf5b4 af_packet: set next0 for AF_PACKET_IF_MODE_ETHERNET mode 
Normally af_packet sets next0 = next_index on each cycle. It works for the most cases.
But if vlib_validate_buffer_enqueue_x1() changes the next_index (from NEXT_ETHERNET to NEXT_DROP for example)
then the following next0 will have the wrong value, and the correct packet will be dropped.

AF_PACKET_IF_MODE_IP handles this case, but AF_PACKET_IF_MODE_ETHERNET doesn't.

Type: fix

Signed-off-by: Artem Glazychev <artem.glazychev@xored.com>
Change-Id: Ic742043e8b10a2abe56b314bb584277151a9c5eb
2024-01-17 14:13:47 +00:00

852 lines
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/*
*------------------------------------------------------------------
* af_packet.c - linux kernel packet interface
*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#include <linux/if_packet.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/interface/rx_queue_funcs.h>
#include <vnet/feature/feature.h>
#include <vnet/ethernet/packet.h>
#include <af_packet/af_packet.h>
#include <vnet/devices/virtio/virtio_std.h>
#define foreach_af_packet_input_error \
_ (PARTIAL_PKT, "partial packet") \
_ (TIMEDOUT_BLK, "timed out block") \
_ (TOTAL_RECV_BLK, "total received block")
typedef enum
{
#define _(f,s) AF_PACKET_INPUT_ERROR_##f,
foreach_af_packet_input_error
#undef _
AF_PACKET_INPUT_N_ERROR,
} af_packet_input_error_t;
static char *af_packet_input_error_strings[] = {
#define _(n,s) s,
foreach_af_packet_input_error
#undef _
};
typedef struct
{
u32 next_index;
u32 hw_if_index;
u16 queue_id;
int block;
u32 pkt_num;
void *block_start;
block_desc_t bd;
union
{
tpacket3_hdr_t tph3;
tpacket2_hdr_t tph2;
};
vnet_virtio_net_hdr_t vnet_hdr;
u8 is_v3;
} af_packet_input_trace_t;
static u8 *
format_af_packet_input_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
af_packet_input_trace_t *t = va_arg (*args, af_packet_input_trace_t *);
u32 indent = format_get_indent (s);
s = format (s, "af_packet: hw_if_index %d rx-queue %u next-index %d",
t->hw_if_index, t->queue_id, t->next_index);
if (t->is_v3)
{
s = format (
s, "\n%Ublock %u:\n%Uaddress %p version %u seq_num %lu pkt_num %u",
format_white_space, indent + 2, t->block, format_white_space,
indent + 4, t->block_start, t->bd.version, t->bd.hdr.bh1.seq_num,
t->pkt_num);
s = format (
s,
"\n%Utpacket3_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u"
"\n%Usec 0x%x nsec 0x%x vlan %U"
#ifdef TP_STATUS_VLAN_TPID_VALID
" vlan_tpid %u"
#endif
,
format_white_space, indent + 2, format_white_space, indent + 4,
t->tph3.tp_status, t->tph3.tp_len, t->tph3.tp_snaplen, t->tph3.tp_mac,
t->tph3.tp_net, format_white_space, indent + 4, t->tph3.tp_sec,
t->tph3.tp_nsec, format_ethernet_vlan_tci, t->tph3.hv1.tp_vlan_tci
#ifdef TP_STATUS_VLAN_TPID_VALID
,
t->tph3.hv1.tp_vlan_tpid
#endif
);
}
else
{
s = format (
s,
"\n%Utpacket2_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u"
"\n%Usec 0x%x nsec 0x%x vlan %U"
#ifdef TP_STATUS_VLAN_TPID_VALID
" vlan_tpid %u"
#endif
,
format_white_space, indent + 2, format_white_space, indent + 4,
t->tph2.tp_status, t->tph2.tp_len, t->tph2.tp_snaplen, t->tph2.tp_mac,
t->tph2.tp_net, format_white_space, indent + 4, t->tph2.tp_sec,
t->tph2.tp_nsec, format_ethernet_vlan_tci, t->tph2.tp_vlan_tci
#ifdef TP_STATUS_VLAN_TPID_VALID
,
t->tph2.tp_vlan_tpid
#endif
);
}
s = format (s,
"\n%Uvnet-hdr:\n%Uflags 0x%02x gso_type 0x%02x hdr_len %u"
"\n%Ugso_size %u csum_start %u csum_offset %u",
format_white_space, indent + 2, format_white_space, indent + 4,
t->vnet_hdr.flags, t->vnet_hdr.gso_type, t->vnet_hdr.hdr_len,
format_white_space, indent + 4, t->vnet_hdr.gso_size,
t->vnet_hdr.csum_start, t->vnet_hdr.csum_offset);
return s;
}
always_inline void
buffer_add_to_chain (vlib_buffer_t *b, vlib_buffer_t *first_b,
vlib_buffer_t *prev_b, u32 bi)
{
/* update first buffer */
first_b->total_length_not_including_first_buffer += b->current_length;
/* update previous buffer */
prev_b->next_buffer = bi;
prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
/* update current buffer */
b->next_buffer = ~0;
}
static_always_inline void
fill_gso_offload (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz)
{
b->flags |= VNET_BUFFER_F_GSO;
vnet_buffer2 (b)->gso_size = gso_size;
vnet_buffer2 (b)->gso_l4_hdr_sz = l4_hdr_sz;
}
static_always_inline void
fill_cksum_offload (vlib_buffer_t *b, u8 *l4_hdr_sz, u8 is_ip)
{
vnet_buffer_oflags_t oflags = 0;
u16 l2hdr_sz = 0;
u16 ethertype = 0;
u8 l4_proto = 0;
if (is_ip)
{
switch (b->data[0] & 0xf0)
{
case 0x40:
ethertype = ETHERNET_TYPE_IP4;
break;
case 0x60:
ethertype = ETHERNET_TYPE_IP6;
break;
}
}
else
{
ethernet_header_t *eth = (ethernet_header_t *) b->data;
ethertype = clib_net_to_host_u16 (eth->type);
l2hdr_sz = sizeof (ethernet_header_t);
if (ethernet_frame_is_tagged (ethertype))
{
ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eth + 1);
ethertype = clib_net_to_host_u16 (vlan->type);
l2hdr_sz += sizeof (*vlan);
if (ethertype == ETHERNET_TYPE_VLAN)
{
vlan++;
ethertype = clib_net_to_host_u16 (vlan->type);
l2hdr_sz += sizeof (*vlan);
}
}
}
vnet_buffer (b)->l2_hdr_offset = 0;
vnet_buffer (b)->l3_hdr_offset = l2hdr_sz;
if (ethertype == ETHERNET_TYPE_IP4)
{
ip4_header_t *ip4 = (ip4_header_t *) (b->data + l2hdr_sz);
vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
b->flags |= (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
l4_proto = ip4->protocol;
}
else if (ethertype == ETHERNET_TYPE_IP6)
{
ip6_header_t *ip6 = (ip6_header_t *) (b->data + l2hdr_sz);
b->flags |= (VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
u16 ip6_hdr_len = sizeof (ip6_header_t);
if (ip6_ext_hdr (ip6->protocol))
{
ip6_ext_header_t *p = (void *) (ip6 + 1);
ip6_hdr_len += ip6_ext_header_len (p);
while (ip6_ext_hdr (p->next_hdr))
{
ip6_hdr_len += ip6_ext_header_len (p);
p = ip6_ext_next_header (p);
}
l4_proto = p->next_hdr;
}
else
l4_proto = ip6->protocol;
vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip6_hdr_len;
}
if (l4_proto == IP_PROTOCOL_TCP)
{
oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
tcp_header_t *tcp =
(tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
*l4_hdr_sz = tcp_header_bytes (tcp);
}
else if (l4_proto == IP_PROTOCOL_UDP)
{
oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
*l4_hdr_sz = sizeof (udp_header_t);
}
if (oflags)
vnet_buffer_offload_flags_set (b, oflags);
}
always_inline uword
af_packet_v3_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, af_packet_if_t *apif,
u16 queue_id, u8 is_cksum_gso_enabled)
{
af_packet_main_t *apm = &af_packet_main;
af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, queue_id);
tpacket3_hdr_t *tph;
u32 next_index;
u32 n_free_bufs;
u32 n_rx_packets = 0;
u32 n_rx_bytes = 0;
u32 timedout_blk = 0;
u32 total = 0;
u32 *to_next = 0;
u32 block = rx_queue->next_rx_block;
u32 block_nr = rx_queue->rx_req->req3.tp_block_nr;
u8 *block_start = 0;
uword n_trace = vlib_get_trace_count (vm, node);
u32 thread_index = vm->thread_index;
u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
u32 min_bufs = rx_queue->rx_req->req3.tp_frame_size / n_buffer_bytes;
u32 num_pkts = 0;
u32 rx_frame_offset = 0;
block_desc_t *bd = 0;
vlib_buffer_t bt = {};
u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP);
if (is_ip)
next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
else
{
next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next_index = apif->per_interface_next_index;
/* redirect if feature path enabled */
vnet_feature_start_device_input (apif->sw_if_index, &next_index, &bt);
}
if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block]))
->hdr.bh1.block_status &
TP_STATUS_USER) != 0)
{
u32 n_required = 0;
bd = (block_desc_t *) block_start;
if (PREDICT_FALSE (rx_queue->is_rx_pending))
{
num_pkts = rx_queue->num_rx_pkts;
rx_frame_offset = rx_queue->rx_frame_offset;
rx_queue->is_rx_pending = 0;
}
else
{
num_pkts = bd->hdr.bh1.num_pkts;
rx_frame_offset = bd->hdr.bh1.offset_to_first_pkt;
total++;
if (TP_STATUS_BLK_TMO & bd->hdr.bh1.block_status)
timedout_blk++;
}
n_required = clib_max (num_pkts, VLIB_FRAME_SIZE);
n_free_bufs = vec_len (apm->rx_buffers[thread_index]);
if (PREDICT_FALSE (n_free_bufs < n_required))
{
vec_validate (apm->rx_buffers[thread_index],
n_required + n_free_bufs - 1);
n_free_bufs += vlib_buffer_alloc (
vm, &apm->rx_buffers[thread_index][n_free_bufs], n_required);
vec_set_len (apm->rx_buffers[thread_index], n_free_bufs);
}
while (num_pkts && (n_free_bufs >= min_bufs))
{
u32 next0 = next_index;
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (num_pkts && n_left_to_next && (n_free_bufs >= min_bufs))
{
tph = (tpacket3_hdr_t *) (block_start + rx_frame_offset);
if (num_pkts > 1)
CLIB_PREFETCH (block_start + rx_frame_offset +
tph->tp_next_offset,
2 * CLIB_CACHE_LINE_BYTES, LOAD);
vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0;
vnet_virtio_net_hdr_t *vnet_hdr = 0;
u32 data_len = tph->tp_snaplen;
u32 offset = 0;
u32 bi0 = ~0, first_bi0 = ~0;
u8 l4_hdr_sz = 0;
if (is_cksum_gso_enabled)
vnet_hdr =
(vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac -
sizeof (vnet_virtio_net_hdr_t));
// save current state and return
if (PREDICT_FALSE (((data_len / n_buffer_bytes) + 1) >
vec_len (apm->rx_buffers[thread_index])))
{
rx_queue->rx_frame_offset = rx_frame_offset;
rx_queue->num_rx_pkts = num_pkts;
rx_queue->is_rx_pending = 1;
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
goto done;
}
while (data_len)
{
/* grab free buffer */
u32 last_empty_buffer =
vec_len (apm->rx_buffers[thread_index]) - 1;
bi0 = apm->rx_buffers[thread_index][last_empty_buffer];
vec_set_len (apm->rx_buffers[thread_index],
last_empty_buffer);
n_free_bufs--;
/* copy data */
u32 bytes_to_copy =
data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
u32 vlan_len = 0;
u32 bytes_copied = 0;
b0 = vlib_get_buffer (vm, bi0);
b0->current_data = 0;
/* Kernel removes VLAN headers, so reconstruct VLAN */
if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID))
{
if (PREDICT_TRUE (offset == 0))
{
clib_memcpy_fast (vlib_buffer_get_current (b0),
(u8 *) tph + tph->tp_mac,
sizeof (ethernet_header_t));
ethernet_header_t *eth =
vlib_buffer_get_current (b0);
ethernet_vlan_header_t *vlan =
(ethernet_vlan_header_t *) (eth + 1);
vlan->priority_cfi_and_id =
clib_host_to_net_u16 (tph->hv1.tp_vlan_tci);
vlan->type = eth->type;
eth->type =
clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
vlan_len = sizeof (ethernet_vlan_header_t);
bytes_copied = sizeof (ethernet_header_t);
}
}
clib_memcpy_fast (((u8 *) vlib_buffer_get_current (b0)) +
bytes_copied + vlan_len,
(u8 *) tph + tph->tp_mac + offset +
bytes_copied,
(bytes_to_copy - bytes_copied));
/* fill buffer header */
b0->current_length = bytes_to_copy + vlan_len;
if (offset == 0)
{
b0->total_length_not_including_first_buffer = 0;
b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
vnet_buffer (b0)->sw_if_index[VLIB_RX] =
apif->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0;
first_b0 = b0;
first_bi0 = bi0;
if (is_cksum_gso_enabled)
{
if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip);
if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 |
VIRTIO_NET_HDR_GSO_TCPV6))
fill_gso_offload (first_b0, vnet_hdr->gso_size,
l4_hdr_sz);
}
}
else
buffer_add_to_chain (b0, first_b0, prev_b0, bi0);
prev_b0 = b0;
offset += bytes_to_copy;
data_len -= bytes_to_copy;
}
n_rx_packets++;
n_rx_bytes += tph->tp_snaplen;
to_next[0] = first_bi0;
to_next += 1;
n_left_to_next--;
/* drop partial packets */
if (PREDICT_FALSE (tph->tp_len != tph->tp_snaplen))
{
next0 = VNET_DEVICE_INPUT_NEXT_DROP;
first_b0->error =
node->errors[AF_PACKET_INPUT_ERROR_PARTIAL_PKT];
}
else
{
if (PREDICT_FALSE (apif->mode == AF_PACKET_IF_MODE_IP))
{
switch (first_b0->data[0] & 0xf0)
{
case 0x40:
next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
break;
case 0x60:
next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
break;
default:
next0 = VNET_DEVICE_INPUT_NEXT_DROP;
break;
}
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next0 = apif->per_interface_next_index;
}
else
{
next0 = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next0 = apif->per_interface_next_index;
/* copy feature arc data from template */
first_b0->current_config_index = bt.current_config_index;
vnet_buffer (first_b0)->feature_arc_index =
vnet_buffer (&bt)->feature_arc_index;
}
}
/* trace */
if (PREDICT_FALSE (n_trace > 0 &&
vlib_trace_buffer (vm, node, next0, first_b0,
/* follow_chain */ 0)))
{
af_packet_input_trace_t *tr;
vlib_set_trace_count (vm, node, --n_trace);
tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
tr->is_v3 = 1;
tr->next_index = next0;
tr->hw_if_index = apif->hw_if_index;
tr->queue_id = queue_id;
tr->block = block;
tr->block_start = bd;
tr->pkt_num = bd->hdr.bh1.num_pkts - num_pkts;
clib_memcpy_fast (&tr->bd, bd, sizeof (block_desc_t));
clib_memcpy_fast (&tr->tph3, tph, sizeof (tpacket3_hdr_t));
if (is_cksum_gso_enabled)
clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr,
sizeof (vnet_virtio_net_hdr_t));
else
clib_memset_u8 (&tr->vnet_hdr, 0,
sizeof (vnet_virtio_net_hdr_t));
}
/* enque and take next packet */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, first_bi0,
next0);
/* next packet */
num_pkts--;
rx_frame_offset += tph->tp_next_offset;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
if (PREDICT_TRUE (num_pkts == 0))
{
bd->hdr.bh1.block_status = TP_STATUS_KERNEL;
block = (block + 1) % block_nr;
}
else
{
rx_queue->rx_frame_offset = rx_frame_offset;
rx_queue->num_rx_pkts = num_pkts;
rx_queue->is_rx_pending = 1;
}
}
rx_queue->next_rx_block = block;
done:
if (apm->polling_count == 0)
{
if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block]))
->hdr.bh1.block_status &
TP_STATUS_USER) != 0)
vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_POLLING);
else
vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_INTERRUPT);
}
vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TOTAL_RECV_BLK,
total);
vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TIMEDOUT_BLK,
timedout_blk);
vlib_increment_combined_counter
(vnet_get_main ()->interface_main.combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_RX,
vlib_get_thread_index (), apif->hw_if_index, n_rx_packets, n_rx_bytes);
vnet_device_increment_rx_packets (thread_index, n_rx_packets);
return n_rx_packets;
}
always_inline uword
af_packet_v2_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, af_packet_if_t *apif,
u16 queue_id, u8 is_cksum_gso_enabled)
{
af_packet_main_t *apm = &af_packet_main;
af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, queue_id);
tpacket2_hdr_t *tph;
u32 next_index;
u32 block = 0;
u32 rx_frame;
u32 n_free_bufs;
u32 n_rx_packets = 0;
u32 n_rx_bytes = 0;
u32 *to_next = 0;
u32 frame_size = rx_queue->rx_req->req.tp_frame_size;
u32 frame_num = rx_queue->rx_req->req.tp_frame_nr;
u8 *block_start = rx_queue->rx_ring[block];
uword n_trace = vlib_get_trace_count (vm, node);
u32 thread_index = vm->thread_index;
u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
u32 min_bufs = rx_queue->rx_req->req.tp_frame_size / n_buffer_bytes;
u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP);
vlib_buffer_t bt = {};
if (is_ip)
{
next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
}
else
{
next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next_index = apif->per_interface_next_index;
/* redirect if feature path enabled */
vnet_feature_start_device_input (apif->sw_if_index, &next_index, &bt);
}
n_free_bufs = vec_len (apm->rx_buffers[thread_index]);
if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE))
{
vec_validate (apm->rx_buffers[thread_index],
VLIB_FRAME_SIZE + n_free_bufs - 1);
n_free_bufs += vlib_buffer_alloc (
vm, &apm->rx_buffers[thread_index][n_free_bufs], VLIB_FRAME_SIZE);
vec_set_len (apm->rx_buffers[thread_index], n_free_bufs);
}
rx_frame = rx_queue->next_rx_frame;
tph = (tpacket2_hdr_t *) (block_start + rx_frame * frame_size);
while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs))
{
vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0;
u32 next0 = next_index;
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs) &&
n_left_to_next)
{
vnet_virtio_net_hdr_t *vnet_hdr = 0;
u32 data_len = tph->tp_snaplen;
u32 offset = 0;
u32 bi0 = 0, first_bi0 = 0;
u8 l4_hdr_sz = 0;
if (is_cksum_gso_enabled)
vnet_hdr =
(vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac -
sizeof (vnet_virtio_net_hdr_t));
while (data_len)
{
/* grab free buffer */
u32 last_empty_buffer =
vec_len (apm->rx_buffers[thread_index]) - 1;
bi0 = apm->rx_buffers[thread_index][last_empty_buffer];
b0 = vlib_get_buffer (vm, bi0);
vec_set_len (apm->rx_buffers[thread_index], last_empty_buffer);
n_free_bufs--;
/* copy data */
u32 bytes_to_copy =
data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
u32 vlan_len = 0;
u32 bytes_copied = 0;
b0->current_data = 0;
/* Kernel removes VLAN headers, so reconstruct VLAN */
if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID))
{
if (PREDICT_TRUE (offset == 0))
{
clib_memcpy_fast (vlib_buffer_get_current (b0),
(u8 *) tph + tph->tp_mac,
sizeof (ethernet_header_t));
ethernet_header_t *eth = vlib_buffer_get_current (b0);
ethernet_vlan_header_t *vlan =
(ethernet_vlan_header_t *) (eth + 1);
vlan->priority_cfi_and_id =
clib_host_to_net_u16 (tph->tp_vlan_tci);
vlan->type = eth->type;
eth->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
vlan_len = sizeof (ethernet_vlan_header_t);
bytes_copied = sizeof (ethernet_header_t);
}
}
clib_memcpy_fast (((u8 *) vlib_buffer_get_current (b0)) +
bytes_copied + vlan_len,
(u8 *) tph + tph->tp_mac + offset +
bytes_copied,
(bytes_to_copy - bytes_copied));
/* fill buffer header */
b0->current_length = bytes_to_copy + vlan_len;
if (offset == 0)
{
b0->total_length_not_including_first_buffer = 0;
b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = apif->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0;
first_bi0 = bi0;
first_b0 = vlib_get_buffer (vm, first_bi0);
if (is_cksum_gso_enabled)
{
if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip);
if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 |
VIRTIO_NET_HDR_GSO_TCPV6))
fill_gso_offload (first_b0, vnet_hdr->gso_size,
l4_hdr_sz);
}
}
else
buffer_add_to_chain (b0, first_b0, prev_b0, bi0);
prev_b0 = b0;
offset += bytes_to_copy;
data_len -= bytes_to_copy;
}
n_rx_packets++;
n_rx_bytes += tph->tp_snaplen;
to_next[0] = first_bi0;
to_next += 1;
n_left_to_next--;
/* drop partial packets */
if (PREDICT_FALSE (tph->tp_len != tph->tp_snaplen))
{
next0 = VNET_DEVICE_INPUT_NEXT_DROP;
first_b0->error =
node->errors[AF_PACKET_INPUT_ERROR_PARTIAL_PKT];
}
else
{
if (PREDICT_FALSE (is_ip))
{
switch (first_b0->data[0] & 0xf0)
{
case 0x40:
next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
break;
case 0x60:
next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
break;
default:
next0 = VNET_DEVICE_INPUT_NEXT_DROP;
break;
}
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next0 = apif->per_interface_next_index;
}
else
{
next0 = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next0 = apif->per_interface_next_index;
/* copy feature arc data from template */
first_b0->current_config_index = bt.current_config_index;
vnet_buffer (first_b0)->feature_arc_index =
vnet_buffer (&bt)->feature_arc_index;
}
}
/* trace */
if (PREDICT_FALSE (n_trace > 0 &&
vlib_trace_buffer (vm, node, next0, first_b0,
/* follow_chain */ 0)))
{
af_packet_input_trace_t *tr;
vlib_set_trace_count (vm, node, --n_trace);
tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
tr->is_v3 = 0;
tr->next_index = next0;
tr->hw_if_index = apif->hw_if_index;
tr->queue_id = queue_id;
clib_memcpy_fast (&tr->tph2, tph, sizeof (struct tpacket2_hdr));
if (is_cksum_gso_enabled)
clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr,
sizeof (vnet_virtio_net_hdr_t));
else
clib_memset_u8 (&tr->vnet_hdr, 0,
sizeof (vnet_virtio_net_hdr_t));
}
/* enque and take next packet */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, first_bi0, next0);
/* next packet */
tph->tp_status = TP_STATUS_KERNEL;
rx_frame = (rx_frame + 1) % frame_num;
tph = (struct tpacket2_hdr *) (block_start + rx_frame * frame_size);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
rx_queue->next_rx_frame = rx_frame;
vlib_increment_combined_counter (
vnet_get_main ()->interface_main.combined_sw_if_counters +
VNET_INTERFACE_COUNTER_RX,
vlib_get_thread_index (), apif->hw_if_index, n_rx_packets, n_rx_bytes);
vnet_device_increment_rx_packets (thread_index, n_rx_packets);
return n_rx_packets;
}
always_inline uword
af_packet_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, af_packet_if_t *apif,
u16 queue_id, u8 is_cksum_gso_enabled)
{
if (apif->version == TPACKET_V3)
return af_packet_v3_device_input_fn (vm, node, frame, apif, queue_id,
is_cksum_gso_enabled);
else
return af_packet_v2_device_input_fn (vm, node, frame, apif, queue_id,
is_cksum_gso_enabled);
}
VLIB_NODE_FN (af_packet_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_rx_packets = 0;
af_packet_main_t *apm = &af_packet_main;
vnet_hw_if_rxq_poll_vector_t *pv;
pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
for (int i = 0; i < vec_len (pv); i++)
{
af_packet_if_t *apif;
apif = vec_elt_at_index (apm->interfaces, pv[i].dev_instance);
if (apif->is_admin_up)
{
if (apif->is_cksum_gso_enabled)
n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif,
pv[i].queue_id, 1);
else
n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif,
pv[i].queue_id, 0);
}
}
return n_rx_packets;
}
VLIB_REGISTER_NODE (af_packet_input_node) = {
.name = "af-packet-input",
.flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
.sibling_of = "device-input",
.format_trace = format_af_packet_input_trace,
.type = VLIB_NODE_TYPE_INPUT,
.state = VLIB_NODE_STATE_INTERRUPT,
.n_errors = AF_PACKET_INPUT_N_ERROR,
.error_strings = af_packet_input_error_strings,
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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