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#include <stddef.h>
#include "packet_parser.h"
#include "packet_inject.h"
#include "packet_handle.h"
static void packet_inject(int next_proto, const char *data, int len, struct metrics *metrics)
{
if (next_proto == 4)
{
struct ip *hdr = (struct ip *)data;
if (packet_inject_ipv4(&hdr->ip_dst, data, len) == 0)
{
ATOMIC_ADD(&metrics->succ_tx_v4_pkts, 1);
ATOMIC_ADD(&metrics->succ_tx_v4_bytes, len);
}
else
{
ATOMIC_ADD(&metrics->err_tx_v4_pkts, 1);
ATOMIC_ADD(&metrics->err_tx_v4_bytes, len);
}
}
if (next_proto == 6)
{
struct ip6_hdr *hdr = (struct ip6_hdr *)data;
if (packet_inject_ipv6(&hdr->ip6_dst, data, len) == 0)
{
ATOMIC_ADD(&metrics->succ_tx_v6_pkts, 1);
ATOMIC_ADD(&metrics->succ_tx_v6_bytes, len);
}
else
{
ATOMIC_ADD(&metrics->err_tx_v6_pkts, 1);
ATOMIC_ADD(&metrics->err_tx_v6_bytes, len);
}
}
}
static void packet_handle_error(struct metrics *metrics, int n_pkts, int n_bytes)
{
ATOMIC_ADD(&metrics->rx_err_pkts, n_pkts);
ATOMIC_ADD(&metrics->rx_err_bytes, n_bytes);
}
// return 1: is gtp
// return 0: not gtp
static int packet_handle_gtp(struct packet_parser *handler, struct metrics *metrics)
{
const struct layer_record *gtp_layer = packet_parser_get_most_outer(handler, LAYER_TYPE_GTPV1_U);
if (gtp_layer == NULL)
{
return 0;
}
if (gtp_layer->hdr_offset + gtp_layer->hdr_len >= handler->packet_len)
{
packet_handle_error(metrics, 1, handler->packet_len);
return 1;
}
const char *inject_data = (const char *)handler->packet_data + gtp_layer->hdr_offset + gtp_layer->hdr_len;
int inject_len = gtp_layer->pld_len;
uint8_t next_proto = gtp_next_proto((const char *)handler->packet_data + gtp_layer->hdr_offset);
if (next_proto != 4 && next_proto != 6)
{
packet_handle_error(metrics, 1, handler->packet_len);
return 1;
}
else
{
packet_inject(next_proto, inject_data, inject_len, metrics);
return 1;
}
}
// return 1: is l3
// return 0: not l3
static int packet_handle_l3(struct packet_parser *handler, struct metrics *metrics)
{
const struct layer_record *l3_layer = packet_parser_get_most_outer(handler, LAYER_TYPE_L3);
if (l3_layer == NULL)
{
return 0;
}
if (l3_layer->hdr_offset >= handler->packet_len)
{
packet_handle_error(metrics, 1, handler->packet_len);
return 1;
}
const char *inject_data = (const char *)handler->packet_data + l3_layer->hdr_offset;
int inject_len = l3_layer->hdr_len + l3_layer->pld_len;
uint8_t next_proto = 0;
if (l3_layer->type == LAYER_TYPE_IPV4)
{
next_proto = 4;
}
else if (l3_layer->type == LAYER_TYPE_IPV6)
{
next_proto = 6;
}
else
{
packet_handle_error(metrics, 1, handler->packet_len);
return 1;
}
packet_inject(next_proto, inject_data, inject_len, metrics);
return 1;
}
void packet_handle(const char *data, int len, struct metrics *metrics)
{
ATOMIC_ADD(&metrics->rx_pkts, 1);
ATOMIC_ADD(&metrics->rx_bytes, len);
if (data == NULL || len <= 0)
{
packet_handle_error(metrics, 1, len);
return;
}
struct packet_parser handler;
uint64_t packet_id = ATOMIC_READ(&metrics->rx_pkts);
packet_parser_init(&handler);
packet_parser_parse(&handler, data, len, packet_id);
// Handle GTP
if (packet_handle_gtp(&handler, metrics) == 1)
{
return;
}
// Handle L3
if (packet_handle_l3(&handler, metrics) == 1)
{
return;
}
packet_handle_error(metrics, 1, len);
}
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