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/* SPDX-License-Identifier: Apache-2.0
* Copyright(c) 2021 Cisco Systems, Inc.
*/
#include <vlib/vlib.h>
#include <vnet/feature/feature.h>
#include <snort/snort.h>
typedef struct
{
u32 next_index;
u32 sw_if_index;
u16 instance;
u16 qpair;
u32 enq_slot;
u32 desc_index;
daq_vpp_desc_t desc;
} snort_enq_trace_t;
static u8 *
format_snort_enq_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 *);
snort_enq_trace_t *t = va_arg (*args, snort_enq_trace_t *);
u32 indent = format_get_indent (s);
s = format (s,
"sw-if-index %u next-index %u\n"
"%Uinstance %u qpair %u desc-index %u slot %u\n"
"%Udesc: buffer-pool %u offset %u len %u address-space-id %u\n",
t->sw_if_index, t->next_index, format_white_space, indent,
t->instance, t->qpair, t->desc_index, t->enq_slot,
format_white_space, indent, t->desc.buffer_pool, t->desc.offset,
t->desc.length, t->desc.address_space_id);
return s;
}
#define foreach_snort_enq_error \
_ (SOCKET_ERROR, "write socket error") \
_ (NO_INSTANCE, "no snort instance") \
_ (NO_ENQ_SLOTS, "no enqueue slots (packet dropped)")
typedef enum
{
#define _(sym, str) SNORT_ENQ_ERROR_##sym,
foreach_snort_enq_error
#undef _
SNORT_ENQ_N_ERROR,
} snort_enq_error_t;
static char *snort_enq_error_strings[] = {
#define _(sym, string) string,
foreach_snort_enq_error
#undef _
};
static_always_inline uword
snort_enq_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, int with_trace)
{
snort_main_t *sm = &snort_main;
snort_instance_t *si = 0;
snort_qpair_t *qp = 0;
u32 thread_index = vm->thread_index;
u32 n_left = frame->n_vectors;
u32 n_trace = 0;
u32 total_enq = 0, n_processed = 0;
u32 *from = vlib_frame_vector_args (frame);
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
vlib_get_buffers (vm, from, bufs, n_left);
while (n_left)
{
u64 fa_data;
u32 instance_index, next_index, n;
u32 l3_offset;
fa_data =
*(u64 *) vnet_feature_next_with_data (&next_index, b[0], sizeof (u64));
instance_index = (u32) (fa_data & 0xffffffff);
l3_offset =
(fa_data >> 32) ? vnet_buffer (b[0])->ip.save_rewrite_length : 0;
si = vec_elt_at_index (sm->instances, instance_index);
/* if client isn't connected skip enqueue and take default action */
if (PREDICT_FALSE (si->client_index == ~0))
{
if (si->drop_on_disconnect)
next[0] = SNORT_ENQ_NEXT_DROP;
else
next[0] = next_index;
next++;
n_processed++;
}
else
{
qp = vec_elt_at_index (si->qpairs, thread_index);
n = qp->n_pending++;
daq_vpp_desc_t *d = qp->pending_descs + n;
qp->pending_nexts[n] = next_index;
qp->pending_buffers[n] = from[0];
vlib_buffer_chain_linearize (vm, b[0]);
/* If this pkt is traced, snapshoot the data */
if (with_trace && b[0]->flags & VLIB_BUFFER_IS_TRACED)
n_trace++;
/* fill descriptor */
d->buffer_pool = b[0]->buffer_pool_index;
d->length = b[0]->current_length;
d->offset = (u8 *) b[0]->data + b[0]->current_data + l3_offset -
sm->buffer_pool_base_addrs[d->buffer_pool];
d->address_space_id = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
}
n_left--;
from++;
b++;
}
if (n_processed)
{
vlib_node_increment_counter (vm, snort_enq_node.index,
SNORT_ENQ_ERROR_NO_INSTANCE, n_processed);
vlib_buffer_enqueue_to_next (vm, node, vlib_frame_vector_args (frame),
nexts, n_processed);
}
vec_foreach (si, sm->instances)
{
u32 head, freelist_len, n_pending, n_enq, mask;
u64 ctr = 1;
qp = vec_elt_at_index (si->qpairs, thread_index);
mask = pow2_mask (qp->log2_queue_size);
n_pending = qp->n_pending;
qp->n_pending = 0;
if (n_pending == 0)
continue;
freelist_len = vec_len (qp->freelist);
if (freelist_len < n_pending)
{
n_enq = freelist_len;
vlib_buffer_free (vm, qp->pending_buffers + n_enq,
n_pending - n_enq);
vlib_node_increment_counter (vm, snort_enq_node.index,
SNORT_ENQ_ERROR_NO_ENQ_SLOTS,
n_pending - n_enq);
}
else
n_enq = n_pending;
if (n_enq == 0)
continue;
total_enq += n_enq;
head = *qp->enq_head;
for (u32 i = 0; i < n_enq; i++)
{
u32 desc_index = qp->freelist[--freelist_len];
qp->next_indices[desc_index] = qp->pending_nexts[i];
ASSERT (qp->buffer_indices[desc_index] == ~0);
qp->buffer_indices[desc_index] = qp->pending_buffers[i];
clib_memcpy_fast (qp->descriptors + desc_index,
qp->pending_descs + i, sizeof (daq_vpp_desc_t));
qp->enq_ring[head & mask] = desc_index;
/* trace */
if (with_trace && n_trace)
{
vlib_buffer_t *tb = vlib_get_buffer (vm, qp->pending_buffers[i]);
if (tb->flags & VLIB_BUFFER_IS_TRACED)
{
snort_enq_trace_t *t =
vlib_add_trace (vm, node, tb, sizeof (*t));
t->sw_if_index = vnet_buffer (tb)->sw_if_index[VLIB_RX];
t->next_index = qp->pending_nexts[i];
t->instance = si->index;
t->qpair = qp - si->qpairs;
t->enq_slot = head & mask;
t->desc_index = desc_index;
clib_memcpy_fast (&t->desc, qp->pending_descs + i,
sizeof (daq_vpp_desc_t));
}
}
head = head + 1;
}
__atomic_store_n (qp->enq_head, head, __ATOMIC_RELEASE);
vec_set_len (qp->freelist, freelist_len);
if (sm->input_mode == VLIB_NODE_STATE_INTERRUPT)
{
if (write (qp->enq_fd, &ctr, sizeof (ctr)) < 0)
vlib_node_increment_counter (vm, snort_enq_node.index,
SNORT_ENQ_ERROR_SOCKET_ERROR, 1);
}
}
return total_enq;
}
VLIB_NODE_FN (snort_enq_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
return snort_enq_node_inline (vm, node, frame, 1 /* is_trace*/);
else
return snort_enq_node_inline (vm, node, frame, 0 /* is_trace*/);
}
VLIB_REGISTER_NODE (snort_enq_node) = {
.name = "snort-enq",
.vector_size = sizeof (u32),
.format_trace = format_snort_enq_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = SNORT_ENQ_N_NEXT_NODES,
.next_nodes = SNORT_ENQ_NEXT_NODES,
.n_errors = ARRAY_LEN (snort_enq_error_strings),
.error_strings = snort_enq_error_strings,
};
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