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/*
* uqmi -- tiny QMI support implementation
*
* Copyright (C) 2023 Alexander Couzens <lynxis@fe80.eu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <string.h>
#include <sys/socket.h>
#include <talloc.h>
#include <unistd.h>
#include "gsmtapv3.h"
#include "gsmtap_util.h"
struct t16l16v {
uint16_t type;
uint16_t length;
uint8_t value[0];
} __attribute__((packed));
#define GSMTAPV3_BB_DIAG_QC_QMI 1
struct gsmtap_instance {
int fd;
bool valid;
};
static struct gsmtap_instance gsmtap_inst;
void gsmtap_disable(void)
{
if (!gsmtap_inst.valid)
return;
if (gsmtap_inst.fd >= 0) {
close(gsmtap_inst.fd);
gsmtap_inst.fd = -1;
}
gsmtap_inst.valid = false;
}
/* add support for IPv6 */
int gsmtap_enable(const char *gsmtap_addr)
{
int ret, sfd;
struct sockaddr_in in = {};
gsmtap_disable();
sfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sfd < 0)
return -1;
in.sin_addr.s_addr = inet_addr(gsmtap_addr);
in.sin_port = htons(GSMTAPV3_UDP_PORT);
in.sin_family = AF_INET;
ret = connect(sfd, (struct sockaddr *) &in, sizeof(struct sockaddr_in));
if (ret < 0)
return -1;
gsmtap_inst.fd = sfd;
gsmtap_inst.valid = true;
return 0;
}
static void tx_gsmtap(void *msg, size_t length)
{
if (!gsmtap_inst.valid)
return ;
write(gsmtap_inst.fd, msg, length);
}
void gsmtap_send(struct modem *modem, void *data, size_t length)
{
if (!gsmtap_inst.valid)
return;
/* WARNING. GSMTAPv3 is still under development and defines will change! */
void *user_data;
void *msg = talloc_size(modem, length + sizeof(struct gsmtap_hdr_v3) + 32);
struct gsmtap_hdr_v3 *gsmtap = msg;
struct t16l16v *metadata = msg + sizeof(struct gsmtap_hdr_v3);
int meta_len = 0, rest;
size_t packet_len = 0;
gsmtap->version = GSMTAPV3_VERSION;
gsmtap->res = 0;
gsmtap->hdr_len = sizeof(struct gsmtap_hdr_v3) >> 2;
gsmtap->type = htons(GSMTAPV3_TYPE_BASEBAND_DIAG);
gsmtap->sub_type = htons(GSMTAPV3_BASEBAND_DIAG_QUALCOMM);
metadata->type = 0x1;
metadata->length = 0x1;
metadata->value[0] = 0x1;
meta_len = sizeof(*metadata) + metadata->length;
rest = meta_len % 4;
if (rest)
meta_len += 4 - rest;
gsmtap->hdr_len += (meta_len >> 2);
gsmtap->hdr_len = htons(gsmtap->hdr_len);
user_data = msg + sizeof(struct gsmtap_hdr_v3) + meta_len;
memcpy(user_data, data, length);
packet_len = length + sizeof(struct gsmtap_hdr_v3) + meta_len;
tx_gsmtap(msg, packet_len);
}
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