pcap.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 Ramon Fried <rfried.dev@gmail.com>
*/
#include <common.h>
#include <net.h>
#include <net/pcap.h>
#include <time.h>
#include <asm/io.h>
#define LINKTYPE_ETHERNET 1
static bool initialized;
static bool running;
static bool buffer_full;
static void *buf;
static unsigned int max_size;
static unsigned int pos;
static unsigned long incoming_count;
static unsigned long outgoing_count;
struct pcap_header {
u32 magic;
u16 version_major;
u16 version_minor;
s32 thiszone;
u32 sigfigs;
u32 snaplen;
u32 network;
};
struct pcap_packet_header {
u32 ts_sec;
u32 ts_usec;
u32 incl_len;
u32 orig_len;
};
static struct pcap_header file_header = {
.magic = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
.snaplen = 65535,
.network = LINKTYPE_ETHERNET,
};
int pcap_init(phys_addr_t paddr, unsigned long size)
{
buf = map_physmem(paddr, size, 0);
if (!buf) {
printf("Failed mapping PCAP memory\n");
return -ENOMEM;
}
printf("PCAP capture initialized: addr: 0x%lx max length: %lu\n",
(unsigned long)buf, size);
memcpy(buf, &file_header, sizeof(file_header));
pos = sizeof(file_header);
max_size = size;
initialized = true;
running = false;
buffer_full = false;
incoming_count = 0;
outgoing_count = 0;
return 0;
}
int pcap_start_stop(bool start)
{
if (!initialized) {
printf("error: pcap was not initialized\n");
return -ENODEV;
}
running = start;
return 0;
}
int pcap_clear(void)
{
if (!initialized) {
printf("error: pcap was not initialized\n");
return -ENODEV;
}
pos = sizeof(file_header);
incoming_count = 0;
outgoing_count = 0;
buffer_full = false;
printf("pcap capture cleared\n");
return 0;
}
int pcap_post(const void *packet, size_t len, bool outgoing)
{
struct pcap_packet_header header;
u64 cur_time = timer_get_us();
if (!initialized || !running || !buf)
return -ENODEV;
if (buffer_full)
return -ENOMEM;
if ((pos + len + sizeof(header)) >= max_size) {
buffer_full = true;
printf("\n!!! Buffer is full, consider increasing buffer size !!!\n");
return -ENOMEM;
}
header.ts_sec = cur_time / 1000000;
header.ts_usec = cur_time % 1000000;
header.incl_len = len;
header.orig_len = len;
memcpy(buf + pos, &header, sizeof(header));
pos += sizeof(header);
memcpy(buf + pos, packet, len);
pos += len;
if (outgoing)
outgoing_count++;
else
incoming_count++;
env_set_hex("pcapsize", pos);
return 0;
}
int pcap_print_status(void)
{
if (!initialized) {
printf("pcap was not initialized\n");
return -ENODEV;
}
printf("PCAP status:\n");
printf("\tInitialized addr: 0x%lx\tmax length: %u\n",
(unsigned long)buf, max_size);
printf("\tStatus: %s.\t file size: %u\n", running ? "Active" : "Idle",
pos);
printf("\tIncoming packets: %lu Outgoing packets: %lu\n",
incoming_count, outgoing_count);
return 0;
}
bool pcap_active(void)
{
return running;
}