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path: root/drivers/tty/n_gsm.c
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Diffstat (limited to 'drivers/tty/n_gsm.c')
-rw-r--r--drivers/tty/n_gsm.c89
1 files changed, 69 insertions, 20 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 739f522cb893..b3550ff9c494 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -339,6 +339,7 @@ struct gsm_mux {
unsigned long bad_fcs;
unsigned long malformed;
unsigned long io_error;
+ unsigned long open_error;
unsigned long bad_size;
unsigned long unsupported;
};
@@ -1450,15 +1451,16 @@ static int gsm_control_command(struct gsm_mux *gsm, int cmd, const u8 *data,
int dlen)
{
struct gsm_msg *msg;
+ struct gsm_dlci *dlci = gsm->dlci[0];
- msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->dlci[0]->ftype);
+ msg = gsm_data_alloc(gsm, 0, dlen + 2, dlci->ftype);
if (msg == NULL)
return -ENOMEM;
msg->data[0] = (cmd << 1) | CR | EA; /* Set C/R */
msg->data[1] = (dlen << 1) | EA;
memcpy(msg->data + 2, data, dlen);
- gsm_data_queue(gsm->dlci[0], msg);
+ gsm_data_queue(dlci, msg);
return 0;
}
@@ -1477,14 +1479,15 @@ static void gsm_control_reply(struct gsm_mux *gsm, int cmd, const u8 *data,
int dlen)
{
struct gsm_msg *msg;
+ struct gsm_dlci *dlci = gsm->dlci[0];
- msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->dlci[0]->ftype);
+ msg = gsm_data_alloc(gsm, 0, dlen + 2, dlci->ftype);
if (msg == NULL)
return;
msg->data[0] = (cmd & 0xFE) << 1 | EA; /* Clear C/R */
msg->data[1] = (dlen << 1) | EA;
memcpy(msg->data + 2, data, dlen);
- gsm_data_queue(gsm->dlci[0], msg);
+ gsm_data_queue(dlci, msg);
}
/**
@@ -1589,6 +1592,7 @@ static int gsm_process_negotiation(struct gsm_mux *gsm, unsigned int addr,
if (debug & DBG_ERRORS)
pr_info("%s unsupported I frame request in PN\n",
__func__);
+ gsm->unsupported++;
return -EINVAL;
default:
if (debug & DBG_ERRORS)
@@ -1730,25 +1734,32 @@ static void gsm_control_negotiation(struct gsm_mux *gsm, unsigned int cr,
struct gsm_dlci *dlci;
struct gsm_dlci_param_bits *params;
- if (dlen < sizeof(struct gsm_dlci_param_bits))
+ if (dlen < sizeof(struct gsm_dlci_param_bits)) {
+ gsm->open_error++;
return;
+ }
/* Invalid DLCI? */
params = (struct gsm_dlci_param_bits *)data;
addr = FIELD_GET(PN_D_FIELD_DLCI, params->d_bits);
- if (addr == 0 || addr >= NUM_DLCI || !gsm->dlci[addr])
+ if (addr == 0 || addr >= NUM_DLCI || !gsm->dlci[addr]) {
+ gsm->open_error++;
return;
+ }
dlci = gsm->dlci[addr];
/* Too late for parameter negotiation? */
- if ((!cr && dlci->state == DLCI_OPENING) || dlci->state == DLCI_OPEN)
+ if ((!cr && dlci->state == DLCI_OPENING) || dlci->state == DLCI_OPEN) {
+ gsm->open_error++;
return;
+ }
/* Process the received parameters */
if (gsm_process_negotiation(gsm, addr, cr, params) != 0) {
/* Negotiation failed. Close the link. */
if (debug & DBG_ERRORS)
pr_info("%s PN failed\n", __func__);
+ gsm->open_error++;
gsm_dlci_close(dlci);
return;
}
@@ -1768,6 +1779,7 @@ static void gsm_control_negotiation(struct gsm_mux *gsm, unsigned int cr,
} else {
if (debug & DBG_ERRORS)
pr_info("%s PN in invalid state\n", __func__);
+ gsm->open_error++;
}
}
@@ -1888,6 +1900,8 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command,
/* Optional unsupported commands */
case CMD_RPN: /* Remote port negotiation */
case CMD_SNC: /* Service negotiation command */
+ gsm->unsupported++;
+ fallthrough;
default:
/* Reply to bad commands with an NSC */
buf[0] = command;
@@ -2221,6 +2235,7 @@ static void gsm_dlci_t1(struct timer_list *t)
dlci->retries--;
mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
} else {
+ gsm->open_error++;
gsm_dlci_begin_close(dlci); /* prevent half open link */
}
break;
@@ -2236,6 +2251,7 @@ static void gsm_dlci_t1(struct timer_list *t)
dlci->mode = DLCI_MODE_ADM;
gsm_dlci_open(dlci);
} else {
+ gsm->open_error++;
gsm_dlci_begin_close(dlci); /* prevent half open link */
}
@@ -2444,8 +2460,10 @@ static void gsm_dlci_command(struct gsm_dlci *dlci, const u8 *data, int len)
data += dlen;
/* Malformed command? */
- if (clen > len)
+ if (clen > len) {
+ dlci->gsm->malformed++;
return;
+ }
if (command & 1)
gsm_control_message(dlci->gsm, command, data, clen);
@@ -2532,6 +2550,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in
return -EINVAL;
if (dc->k > 7)
return -EINVAL;
+ if (dc->flags & ~GSM_FL_RESTART) /* allow future extensions */
+ return -EINVAL;
/*
* See what is needed for reconfiguration
@@ -2546,6 +2566,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in
/* Requires care */
if (dc->priority != dlci->prio)
need_restart = true;
+ if (dc->flags & GSM_FL_RESTART)
+ need_restart = true;
if ((open && gsm->wait_config) || need_restart)
need_open = true;
@@ -2753,12 +2775,16 @@ static void gsm_queue(struct gsm_mux *gsm)
switch (gsm->control) {
case SABM|PF:
- if (cr == 1)
+ if (cr == 1) {
+ gsm->open_error++;
goto invalid;
+ }
if (dlci == NULL)
dlci = gsm_dlci_alloc(gsm, address);
- if (dlci == NULL)
+ if (dlci == NULL) {
+ gsm->open_error++;
return;
+ }
if (dlci->dead)
gsm_response(gsm, address, DM|PF);
else {
@@ -3276,7 +3302,6 @@ static void gsm_copy_config_values(struct gsm_mux *gsm,
static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c)
{
- int ret = 0;
int need_close = 0;
int need_restart = 0;
@@ -3355,7 +3380,7 @@ static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c)
* and removing from the mux array
*/
if (gsm->dead) {
- ret = gsm_activate_mux(gsm);
+ int ret = gsm_activate_mux(gsm);
if (ret)
return ret;
if (gsm->initiator)
@@ -3374,6 +3399,7 @@ static void gsm_copy_config_ext_values(struct gsm_mux *gsm,
static int gsm_config_ext(struct gsm_mux *gsm, struct gsm_config_ext *ce)
{
+ bool need_restart = false;
unsigned int i;
/*
@@ -3383,6 +3409,20 @@ static int gsm_config_ext(struct gsm_mux *gsm, struct gsm_config_ext *ce)
for (i = 0; i < ARRAY_SIZE(ce->reserved); i++)
if (ce->reserved[i])
return -EINVAL;
+ if (ce->flags & ~GSM_FL_RESTART)
+ return -EINVAL;
+
+ /* Requires care */
+ if (ce->flags & GSM_FL_RESTART)
+ need_restart = true;
+
+ /*
+ * Close down what is needed, restart and initiate the new
+ * configuration. On the first time there is no DLCI[0]
+ * and closing or cleaning up is not necessary.
+ */
+ if (need_restart)
+ gsm_cleanup_mux(gsm, true);
/*
* Setup the new configuration values
@@ -3390,6 +3430,14 @@ static int gsm_config_ext(struct gsm_mux *gsm, struct gsm_config_ext *ce)
gsm->wait_config = ce->wait_config ? true : false;
gsm->keep_alive = ce->keep_alive;
+ if (gsm->dead) {
+ int ret = gsm_activate_mux(gsm);
+ if (ret)
+ return ret;
+ if (gsm->initiator)
+ gsm_dlci_begin_open(gsm->dlci[0]);
+ }
+
return 0;
}
@@ -3490,8 +3538,8 @@ static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
gsm->tty = NULL;
}
-static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- const char *fp, int count)
+static void gsmld_receive_buf(struct tty_struct *tty, const u8 *cp,
+ const u8 *fp, size_t count)
{
struct gsm_mux *gsm = tty->disc_data;
char flags = TTY_NORMAL;
@@ -3577,6 +3625,9 @@ static int gsmld_open(struct tty_struct *tty)
{
struct gsm_mux *gsm;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
if (tty->ops->write == NULL)
return -EINVAL;
@@ -3636,9 +3687,8 @@ static void gsmld_write_wakeup(struct tty_struct *tty)
* This code must be sure never to sleep through a hangup.
*/
-static ssize_t gsmld_read(struct tty_struct *tty, struct file *file,
- unsigned char *buf, size_t nr,
- void **cookie, unsigned long offset)
+static ssize_t gsmld_read(struct tty_struct *tty, struct file *file, u8 *buf,
+ size_t nr, void **cookie, unsigned long offset)
{
return -EOPNOTSUPP;
}
@@ -3658,7 +3708,7 @@ static ssize_t gsmld_read(struct tty_struct *tty, struct file *file,
*/
static ssize_t gsmld_write(struct tty_struct *tty, struct file *file,
- const unsigned char *buf, size_t nr)
+ const u8 *buf, size_t nr)
{
struct gsm_mux *gsm = tty->disc_data;
unsigned long flags;
@@ -4254,8 +4304,7 @@ static void gsmtty_hangup(struct tty_struct *tty)
gsm_dlci_begin_close(dlci);
}
-static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf,
- int len)
+static ssize_t gsmtty_write(struct tty_struct *tty, const u8 *buf, size_t len)
{
int sent;
struct gsm_dlci *dlci = tty->driver_data;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 21:59:35 +0000