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/*
**********************************************************************************************
* File: packet_io_util.cpp
* Description:
* Authors: Liu WenTan <[email protected]>
* Date: 2022-07-15
* Copyright: (c) 2018-2022 Geedge Networks, Inc. All rights reserved.
***********************************************************************************************
*/
#include <string.h>
#include <netinet/ether.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include "utils.h"
#include "packet_io_util.h"
static ssize_t packet_copy_data_offset(uint8_t *ptr, uint32_t offset, const uint8_t *data, uint32_t data_len)
{
memcpy(ptr + offset, data, data_len);
return 0;
}
ssize_t packet_copy_data(uint8_t *ptr, const uint8_t *pkt_data, uint32_t pkt_len)
{
return packet_copy_data_offset(ptr, 0, pkt_data, pkt_len);
}
void pio_packet_queue_init(struct pio_packet_queue *q)
{
if (nullptr == q) {
return;
}
q->bot = nullptr;
q->top = nullptr;
q->len = 0;
pthread_mutex_init(&q->mutex_q, nullptr);
}
void pio_packet_enqueue(struct pio_packet_queue *q, struct pio_packet *p)
{
if (nullptr == p)
return;
/* more packets in queue */
if (q->top != nullptr) {
p->prev = nullptr;
p->next = q->top;
q->top->prev = p;
q->top = p;
/* only packet */
} else {
p->prev = nullptr;
p->next = nullptr;
q->top = p;
q->bot = p;
}
q->len++;
}
struct pio_packet *pio_packet_dequeue(struct pio_packet_queue *q)
{
struct pio_packet *p = nullptr;
/* if the queue is empty there are no packets left. */
if (q->len == 0) {
return nullptr;
}
q->len--;
/* pull the bottom packet from the queue */
p = q->bot;
/* more packets in queue */
if (q->bot->prev != nullptr) {
q->bot = q->bot->prev;
q->bot->next = nullptr;
/* just the one we remove, so now empty */
} else {
q->top = nullptr;
q->bot = nullptr;
}
p->next = nullptr;
p->prev = nullptr;
return p;
}
void release_pio_packet_queue(struct pio_packet_queue *q)
{
if (nullptr == q) {
return;
}
while (q->len != 0) {
struct pio_packet *p = pio_packet_dequeue(q);
FREE(p);
}
}
ssize_t strncpy_safe(char *dst, const char *src, size_t dst_size)
{
if (nullptr == dst || nullptr == src || dst_size == 0) {
return -1;
}
size_t slen = strlen(src);
if (slen >= dst_size) {
strncpy(dst, src, dst_size);
dst[dst_size - 1] = '\0';
} else {
strcpy(dst, src);
}
return 0;
}
static uint32_t simple_murmur_hash(const void *key, int len)
{
const uint32_t m = 0x5bd1e995;
const int r = 24;
/* Initialize the hash to a 'random' value */
uint32_t h = len;
const unsigned char *data = (const unsigned char *)key;
while (len >= 4) {
uint32_t k = *(uint32_t *)data;
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
data += 4;
len -= 4;
}
/* Handle the last few bytes of the input array */
switch (len) {
case 3:
h ^= data[2] << 16;
case 2:
h ^= data[1] << 8;
case 1:
h ^= data[0];
h *= m;
};
/* Do a few final mixes of the hash to ensure the last few
// bytes are well-incorporated. */
h ^= h >> 13;
h *= m;
h ^= h >> 15;
return h;
}
static uint64_t generic_2tuple_hash(uint8_t *src, uint8_t *dst, size_t n)
{
if (nullptr == src || nullptr == dst || n == 0) {
return 0;
}
uint64_t key1 = simple_murmur_hash(src, n);
uint64_t key2 = simple_murmur_hash(dst, n);
return (key1 ^ key2);
}
uint64_t pio_packet_hash(struct pio_packet *p)
{
struct ethhdr *eth_hdr = (struct ethhdr *)p->pkt_payload;
uint8_t *disp_arg1 = nullptr;
uint8_t *disp_arg2 = nullptr;
size_t disp_len = 0;
if (p->data_link != LINKTYPE_ETHERNET) {
return 0;
}
uint16_t eth_type = ntohs(eth_hdr->h_proto);
if (eth_type == ETHERNET_TYPE_IP) {
struct iphdr *ipv4_hdr = (struct iphdr *)(eth_hdr + 1);
disp_arg1 = (uint8_t *)&ipv4_hdr->saddr;
disp_arg2= (uint8_t *)&ipv4_hdr->daddr;
disp_len = sizeof(uint32_t);
} else if (eth_type == ETHERNET_TYPE_IPV6) {
struct ip6_hdr *ipv6_hdr = (struct ip6_hdr *)(eth_hdr + 1);
disp_arg1 = (uint8_t *)&ipv6_hdr->ip6_src;
disp_arg2 = (uint8_t *)&ipv6_hdr->ip6_dst;
disp_len = sizeof(struct in6_addr);
}
uint64_t hash = generic_2tuple_hash(disp_arg1, disp_arg2, disp_len);
return hash;
}
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