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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
654 lines
16 KiB
C
654 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Author Karsten Keil <kkeil@novell.com>
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*
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* Copyright 2008 by Karsten Keil <kkeil@novell.com>
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*/
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#include <linux/slab.h>
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#include <linux/mISDNif.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/sched/cputime.h>
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#include <linux/signal.h>
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#include "core.h"
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static u_int *debug;
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static inline void
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_queue_message(struct mISDNstack *st, struct sk_buff *skb)
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{
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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if (*debug & DEBUG_QUEUE_FUNC)
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printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
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__func__, hh->prim, hh->id, skb);
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skb_queue_tail(&st->msgq, skb);
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if (likely(!test_bit(mISDN_STACK_STOPPED, &st->status))) {
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test_and_set_bit(mISDN_STACK_WORK, &st->status);
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wake_up_interruptible(&st->workq);
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}
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}
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static int
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mISDN_queue_message(struct mISDNchannel *ch, struct sk_buff *skb)
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{
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_queue_message(ch->st, skb);
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return 0;
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}
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static struct mISDNchannel *
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get_channel4id(struct mISDNstack *st, u_int id)
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{
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struct mISDNchannel *ch;
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mutex_lock(&st->lmutex);
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list_for_each_entry(ch, &st->layer2, list) {
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if (id == ch->nr)
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goto unlock;
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}
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ch = NULL;
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unlock:
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mutex_unlock(&st->lmutex);
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return ch;
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}
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static void
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send_socklist(struct mISDN_sock_list *sl, struct sk_buff *skb)
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{
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struct sock *sk;
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struct sk_buff *cskb = NULL;
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read_lock(&sl->lock);
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sk_for_each(sk, &sl->head) {
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if (sk->sk_state != MISDN_BOUND)
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continue;
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if (!cskb)
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cskb = skb_copy(skb, GFP_ATOMIC);
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if (!cskb) {
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printk(KERN_WARNING "%s no skb\n", __func__);
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break;
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}
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if (!sock_queue_rcv_skb(sk, cskb))
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cskb = NULL;
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}
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read_unlock(&sl->lock);
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dev_kfree_skb(cskb);
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}
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static void
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send_layer2(struct mISDNstack *st, struct sk_buff *skb)
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{
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struct sk_buff *cskb;
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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struct mISDNchannel *ch;
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int ret;
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if (!st)
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return;
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mutex_lock(&st->lmutex);
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if ((hh->id & MISDN_ID_ADDR_MASK) == MISDN_ID_ANY) { /* L2 for all */
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list_for_each_entry(ch, &st->layer2, list) {
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if (list_is_last(&ch->list, &st->layer2)) {
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cskb = skb;
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skb = NULL;
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} else {
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cskb = skb_copy(skb, GFP_KERNEL);
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}
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if (cskb) {
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ret = ch->send(ch, cskb);
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if (ret) {
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if (*debug & DEBUG_SEND_ERR)
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printk(KERN_DEBUG
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"%s ch%d prim(%x) addr(%x)"
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" err %d\n",
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__func__, ch->nr,
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hh->prim, ch->addr, ret);
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dev_kfree_skb(cskb);
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}
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} else {
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printk(KERN_WARNING "%s ch%d addr %x no mem\n",
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__func__, ch->nr, ch->addr);
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goto out;
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}
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}
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} else {
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list_for_each_entry(ch, &st->layer2, list) {
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if ((hh->id & MISDN_ID_ADDR_MASK) == ch->addr) {
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ret = ch->send(ch, skb);
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if (!ret)
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skb = NULL;
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goto out;
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}
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}
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ret = st->dev->teimgr->ctrl(st->dev->teimgr, CHECK_DATA, skb);
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if (!ret)
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skb = NULL;
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else if (*debug & DEBUG_SEND_ERR)
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printk(KERN_DEBUG
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"%s mgr prim(%x) err %d\n",
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__func__, hh->prim, ret);
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}
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out:
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mutex_unlock(&st->lmutex);
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dev_kfree_skb(skb);
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}
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static inline int
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send_msg_to_layer(struct mISDNstack *st, struct sk_buff *skb)
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{
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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struct mISDNchannel *ch;
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int lm;
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lm = hh->prim & MISDN_LAYERMASK;
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if (*debug & DEBUG_QUEUE_FUNC)
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printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
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__func__, hh->prim, hh->id, skb);
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if (lm == 0x1) {
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if (!hlist_empty(&st->l1sock.head)) {
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__net_timestamp(skb);
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send_socklist(&st->l1sock, skb);
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}
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return st->layer1->send(st->layer1, skb);
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} else if (lm == 0x2) {
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if (!hlist_empty(&st->l1sock.head))
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send_socklist(&st->l1sock, skb);
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send_layer2(st, skb);
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return 0;
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} else if (lm == 0x4) {
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ch = get_channel4id(st, hh->id);
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if (ch)
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return ch->send(ch, skb);
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else
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printk(KERN_WARNING
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"%s: dev(%s) prim(%x) id(%x) no channel\n",
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__func__, dev_name(&st->dev->dev), hh->prim,
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hh->id);
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} else if (lm == 0x8) {
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WARN_ON(lm == 0x8);
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ch = get_channel4id(st, hh->id);
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if (ch)
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return ch->send(ch, skb);
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else
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printk(KERN_WARNING
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"%s: dev(%s) prim(%x) id(%x) no channel\n",
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__func__, dev_name(&st->dev->dev), hh->prim,
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hh->id);
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} else {
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/* broadcast not handled yet */
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printk(KERN_WARNING "%s: dev(%s) prim %x not delivered\n",
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__func__, dev_name(&st->dev->dev), hh->prim);
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}
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return -ESRCH;
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}
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static void
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do_clear_stack(struct mISDNstack *st)
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{
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}
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static int
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mISDNStackd(void *data)
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{
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struct mISDNstack *st = data;
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#ifdef MISDN_MSG_STATS
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u64 utime, stime;
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#endif
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int err = 0;
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sigfillset(¤t->blocked);
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if (*debug & DEBUG_MSG_THREAD)
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printk(KERN_DEBUG "mISDNStackd %s started\n",
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dev_name(&st->dev->dev));
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if (st->notify != NULL) {
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complete(st->notify);
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st->notify = NULL;
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}
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for (;;) {
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struct sk_buff *skb;
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if (unlikely(test_bit(mISDN_STACK_STOPPED, &st->status))) {
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test_and_clear_bit(mISDN_STACK_WORK, &st->status);
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test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
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} else
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test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
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while (test_bit(mISDN_STACK_WORK, &st->status)) {
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skb = skb_dequeue(&st->msgq);
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if (!skb) {
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test_and_clear_bit(mISDN_STACK_WORK,
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&st->status);
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/* test if a race happens */
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skb = skb_dequeue(&st->msgq);
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if (!skb)
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continue;
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test_and_set_bit(mISDN_STACK_WORK,
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&st->status);
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}
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#ifdef MISDN_MSG_STATS
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st->msg_cnt++;
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#endif
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err = send_msg_to_layer(st, skb);
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if (unlikely(err)) {
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if (*debug & DEBUG_SEND_ERR)
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printk(KERN_DEBUG
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"%s: %s prim(%x) id(%x) "
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"send call(%d)\n",
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__func__, dev_name(&st->dev->dev),
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mISDN_HEAD_PRIM(skb),
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mISDN_HEAD_ID(skb), err);
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dev_kfree_skb(skb);
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continue;
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}
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if (unlikely(test_bit(mISDN_STACK_STOPPED,
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&st->status))) {
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test_and_clear_bit(mISDN_STACK_WORK,
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&st->status);
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test_and_clear_bit(mISDN_STACK_RUNNING,
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&st->status);
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break;
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}
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}
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if (test_bit(mISDN_STACK_CLEARING, &st->status)) {
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test_and_set_bit(mISDN_STACK_STOPPED, &st->status);
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test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
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do_clear_stack(st);
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test_and_clear_bit(mISDN_STACK_CLEARING, &st->status);
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test_and_set_bit(mISDN_STACK_RESTART, &st->status);
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}
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if (test_and_clear_bit(mISDN_STACK_RESTART, &st->status)) {
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test_and_clear_bit(mISDN_STACK_STOPPED, &st->status);
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test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
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if (!skb_queue_empty(&st->msgq))
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test_and_set_bit(mISDN_STACK_WORK,
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&st->status);
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}
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if (test_bit(mISDN_STACK_ABORT, &st->status))
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break;
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if (st->notify != NULL) {
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complete(st->notify);
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st->notify = NULL;
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}
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#ifdef MISDN_MSG_STATS
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st->sleep_cnt++;
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#endif
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test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
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wait_event_interruptible(st->workq, (st->status &
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mISDN_STACK_ACTION_MASK));
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if (*debug & DEBUG_MSG_THREAD)
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printk(KERN_DEBUG "%s: %s wake status %08lx\n",
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__func__, dev_name(&st->dev->dev), st->status);
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test_and_set_bit(mISDN_STACK_ACTIVE, &st->status);
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test_and_clear_bit(mISDN_STACK_WAKEUP, &st->status);
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if (test_bit(mISDN_STACK_STOPPED, &st->status)) {
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test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
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#ifdef MISDN_MSG_STATS
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st->stopped_cnt++;
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#endif
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}
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}
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#ifdef MISDN_MSG_STATS
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printk(KERN_DEBUG "mISDNStackd daemon for %s proceed %d "
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"msg %d sleep %d stopped\n",
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dev_name(&st->dev->dev), st->msg_cnt, st->sleep_cnt,
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st->stopped_cnt);
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task_cputime(st->thread, &utime, &stime);
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printk(KERN_DEBUG
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"mISDNStackd daemon for %s utime(%llu) stime(%llu)\n",
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dev_name(&st->dev->dev), utime, stime);
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printk(KERN_DEBUG
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"mISDNStackd daemon for %s nvcsw(%ld) nivcsw(%ld)\n",
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dev_name(&st->dev->dev), st->thread->nvcsw, st->thread->nivcsw);
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printk(KERN_DEBUG "mISDNStackd daemon for %s killed now\n",
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dev_name(&st->dev->dev));
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#endif
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test_and_set_bit(mISDN_STACK_KILLED, &st->status);
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test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
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test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
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test_and_clear_bit(mISDN_STACK_ABORT, &st->status);
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skb_queue_purge(&st->msgq);
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st->thread = NULL;
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if (st->notify != NULL) {
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complete(st->notify);
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st->notify = NULL;
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}
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return 0;
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}
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static int
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l1_receive(struct mISDNchannel *ch, struct sk_buff *skb)
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{
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if (!ch->st)
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return -ENODEV;
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__net_timestamp(skb);
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_queue_message(ch->st, skb);
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return 0;
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}
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void
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set_channel_address(struct mISDNchannel *ch, u_int sapi, u_int tei)
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{
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ch->addr = sapi | (tei << 8);
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}
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void
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__add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
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{
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list_add_tail(&ch->list, &st->layer2);
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}
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void
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add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
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{
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mutex_lock(&st->lmutex);
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__add_layer2(ch, st);
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mutex_unlock(&st->lmutex);
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}
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static int
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st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
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{
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if (!ch->st || !ch->st->layer1)
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return -EINVAL;
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return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg);
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}
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int
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create_stack(struct mISDNdevice *dev)
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{
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struct mISDNstack *newst;
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int err;
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DECLARE_COMPLETION_ONSTACK(done);
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newst = kzalloc(sizeof(struct mISDNstack), GFP_KERNEL);
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if (!newst) {
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printk(KERN_ERR "kmalloc mISDN_stack failed\n");
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return -ENOMEM;
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}
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newst->dev = dev;
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INIT_LIST_HEAD(&newst->layer2);
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INIT_HLIST_HEAD(&newst->l1sock.head);
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rwlock_init(&newst->l1sock.lock);
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init_waitqueue_head(&newst->workq);
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skb_queue_head_init(&newst->msgq);
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mutex_init(&newst->lmutex);
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dev->D.st = newst;
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err = create_teimanager(dev);
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if (err) {
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printk(KERN_ERR "kmalloc teimanager failed\n");
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kfree(newst);
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return err;
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}
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dev->teimgr->peer = &newst->own;
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dev->teimgr->recv = mISDN_queue_message;
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dev->teimgr->st = newst;
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newst->layer1 = &dev->D;
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dev->D.recv = l1_receive;
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dev->D.peer = &newst->own;
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newst->own.st = newst;
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newst->own.ctrl = st_own_ctrl;
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newst->own.send = mISDN_queue_message;
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newst->own.recv = mISDN_queue_message;
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if (*debug & DEBUG_CORE_FUNC)
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printk(KERN_DEBUG "%s: st(%s)\n", __func__,
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dev_name(&newst->dev->dev));
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newst->notify = &done;
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newst->thread = kthread_run(mISDNStackd, (void *)newst, "mISDN_%s",
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dev_name(&newst->dev->dev));
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if (IS_ERR(newst->thread)) {
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err = PTR_ERR(newst->thread);
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printk(KERN_ERR
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"mISDN:cannot create kernel thread for %s (%d)\n",
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dev_name(&newst->dev->dev), err);
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delete_teimanager(dev->teimgr);
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kfree(newst);
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} else
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wait_for_completion(&done);
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return err;
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}
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int
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connect_layer1(struct mISDNdevice *dev, struct mISDNchannel *ch,
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u_int protocol, struct sockaddr_mISDN *adr)
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{
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struct mISDN_sock *msk = container_of(ch, struct mISDN_sock, ch);
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struct channel_req rq;
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int err;
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if (*debug & DEBUG_CORE_FUNC)
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printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
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__func__, dev_name(&dev->dev), protocol, adr->dev,
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adr->channel, adr->sapi, adr->tei);
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switch (protocol) {
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case ISDN_P_NT_S0:
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case ISDN_P_NT_E1:
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case ISDN_P_TE_S0:
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case ISDN_P_TE_E1:
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ch->recv = mISDN_queue_message;
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ch->peer = &dev->D.st->own;
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ch->st = dev->D.st;
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rq.protocol = protocol;
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rq.adr.channel = adr->channel;
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err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
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printk(KERN_DEBUG "%s: ret %d (dev %d)\n", __func__, err,
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dev->id);
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if (err)
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return err;
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write_lock_bh(&dev->D.st->l1sock.lock);
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sk_add_node(&msk->sk, &dev->D.st->l1sock.head);
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write_unlock_bh(&dev->D.st->l1sock.lock);
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break;
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default:
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return -ENOPROTOOPT;
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}
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return 0;
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}
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int
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connect_Bstack(struct mISDNdevice *dev, struct mISDNchannel *ch,
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u_int protocol, struct sockaddr_mISDN *adr)
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{
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struct channel_req rq, rq2;
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int pmask, err;
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struct Bprotocol *bp;
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if (*debug & DEBUG_CORE_FUNC)
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printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
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__func__, dev_name(&dev->dev), protocol,
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adr->dev, adr->channel, adr->sapi,
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adr->tei);
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ch->st = dev->D.st;
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pmask = 1 << (protocol & ISDN_P_B_MASK);
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if (pmask & dev->Bprotocols) {
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|
rq.protocol = protocol;
|
|
rq.adr = *adr;
|
|
err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
|
|
if (err)
|
|
return err;
|
|
ch->recv = rq.ch->send;
|
|
ch->peer = rq.ch;
|
|
rq.ch->recv = ch->send;
|
|
rq.ch->peer = ch;
|
|
rq.ch->st = dev->D.st;
|
|
} else {
|
|
bp = get_Bprotocol4mask(pmask);
|
|
if (!bp)
|
|
return -ENOPROTOOPT;
|
|
rq2.protocol = protocol;
|
|
rq2.adr = *adr;
|
|
rq2.ch = ch;
|
|
err = bp->create(&rq2);
|
|
if (err)
|
|
return err;
|
|
ch->recv = rq2.ch->send;
|
|
ch->peer = rq2.ch;
|
|
rq2.ch->st = dev->D.st;
|
|
rq.protocol = rq2.protocol;
|
|
rq.adr = *adr;
|
|
err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
|
|
if (err) {
|
|
rq2.ch->ctrl(rq2.ch, CLOSE_CHANNEL, NULL);
|
|
return err;
|
|
}
|
|
rq2.ch->recv = rq.ch->send;
|
|
rq2.ch->peer = rq.ch;
|
|
rq.ch->recv = rq2.ch->send;
|
|
rq.ch->peer = rq2.ch;
|
|
rq.ch->st = dev->D.st;
|
|
}
|
|
ch->protocol = protocol;
|
|
ch->nr = rq.ch->nr;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
create_l2entity(struct mISDNdevice *dev, struct mISDNchannel *ch,
|
|
u_int protocol, struct sockaddr_mISDN *adr)
|
|
{
|
|
struct channel_req rq;
|
|
int err;
|
|
|
|
if (*debug & DEBUG_CORE_FUNC)
|
|
printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
|
|
__func__, dev_name(&dev->dev), protocol,
|
|
adr->dev, adr->channel, adr->sapi,
|
|
adr->tei);
|
|
rq.protocol = ISDN_P_TE_S0;
|
|
if (dev->Dprotocols & (1 << ISDN_P_TE_E1))
|
|
rq.protocol = ISDN_P_TE_E1;
|
|
switch (protocol) {
|
|
case ISDN_P_LAPD_NT:
|
|
rq.protocol = ISDN_P_NT_S0;
|
|
if (dev->Dprotocols & (1 << ISDN_P_NT_E1))
|
|
rq.protocol = ISDN_P_NT_E1;
|
|
fallthrough;
|
|
case ISDN_P_LAPD_TE:
|
|
ch->recv = mISDN_queue_message;
|
|
ch->peer = &dev->D.st->own;
|
|
ch->st = dev->D.st;
|
|
rq.adr.channel = 0;
|
|
err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
|
|
printk(KERN_DEBUG "%s: ret 1 %d\n", __func__, err);
|
|
if (err)
|
|
break;
|
|
rq.protocol = protocol;
|
|
rq.adr = *adr;
|
|
rq.ch = ch;
|
|
err = dev->teimgr->ctrl(dev->teimgr, OPEN_CHANNEL, &rq);
|
|
printk(KERN_DEBUG "%s: ret 2 %d\n", __func__, err);
|
|
if (!err) {
|
|
if ((protocol == ISDN_P_LAPD_NT) && !rq.ch)
|
|
break;
|
|
add_layer2(rq.ch, dev->D.st);
|
|
rq.ch->recv = mISDN_queue_message;
|
|
rq.ch->peer = &dev->D.st->own;
|
|
rq.ch->ctrl(rq.ch, OPEN_CHANNEL, NULL); /* can't fail */
|
|
}
|
|
break;
|
|
default:
|
|
err = -EPROTONOSUPPORT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void
|
|
delete_channel(struct mISDNchannel *ch)
|
|
{
|
|
struct mISDN_sock *msk = container_of(ch, struct mISDN_sock, ch);
|
|
struct mISDNchannel *pch;
|
|
|
|
if (!ch->st) {
|
|
printk(KERN_WARNING "%s: no stack\n", __func__);
|
|
return;
|
|
}
|
|
if (*debug & DEBUG_CORE_FUNC)
|
|
printk(KERN_DEBUG "%s: st(%s) protocol(%x)\n", __func__,
|
|
dev_name(&ch->st->dev->dev), ch->protocol);
|
|
if (ch->protocol >= ISDN_P_B_START) {
|
|
if (ch->peer) {
|
|
ch->peer->ctrl(ch->peer, CLOSE_CHANNEL, NULL);
|
|
ch->peer = NULL;
|
|
}
|
|
return;
|
|
}
|
|
switch (ch->protocol) {
|
|
case ISDN_P_NT_S0:
|
|
case ISDN_P_TE_S0:
|
|
case ISDN_P_NT_E1:
|
|
case ISDN_P_TE_E1:
|
|
write_lock_bh(&ch->st->l1sock.lock);
|
|
sk_del_node_init(&msk->sk);
|
|
write_unlock_bh(&ch->st->l1sock.lock);
|
|
ch->st->dev->D.ctrl(&ch->st->dev->D, CLOSE_CHANNEL, NULL);
|
|
break;
|
|
case ISDN_P_LAPD_TE:
|
|
pch = get_channel4id(ch->st, ch->nr);
|
|
if (pch) {
|
|
mutex_lock(&ch->st->lmutex);
|
|
list_del(&pch->list);
|
|
mutex_unlock(&ch->st->lmutex);
|
|
pch->ctrl(pch, CLOSE_CHANNEL, NULL);
|
|
pch = ch->st->dev->teimgr;
|
|
pch->ctrl(pch, CLOSE_CHANNEL, NULL);
|
|
} else
|
|
printk(KERN_WARNING "%s: no l2 channel\n",
|
|
__func__);
|
|
break;
|
|
case ISDN_P_LAPD_NT:
|
|
pch = ch->st->dev->teimgr;
|
|
if (pch) {
|
|
pch->ctrl(pch, CLOSE_CHANNEL, NULL);
|
|
} else
|
|
printk(KERN_WARNING "%s: no l2 channel\n",
|
|
__func__);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
void
|
|
delete_stack(struct mISDNdevice *dev)
|
|
{
|
|
struct mISDNstack *st = dev->D.st;
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
|
|
if (*debug & DEBUG_CORE_FUNC)
|
|
printk(KERN_DEBUG "%s: st(%s)\n", __func__,
|
|
dev_name(&st->dev->dev));
|
|
if (dev->teimgr)
|
|
delete_teimanager(dev->teimgr);
|
|
if (st->thread) {
|
|
if (st->notify) {
|
|
printk(KERN_WARNING "%s: notifier in use\n",
|
|
__func__);
|
|
complete(st->notify);
|
|
}
|
|
st->notify = &done;
|
|
test_and_set_bit(mISDN_STACK_ABORT, &st->status);
|
|
test_and_set_bit(mISDN_STACK_WAKEUP, &st->status);
|
|
wake_up_interruptible(&st->workq);
|
|
wait_for_completion(&done);
|
|
}
|
|
if (!list_empty(&st->layer2))
|
|
printk(KERN_WARNING "%s: layer2 list not empty\n",
|
|
__func__);
|
|
if (!hlist_empty(&st->l1sock.head))
|
|
printk(KERN_WARNING "%s: layer1 list not empty\n",
|
|
__func__);
|
|
kfree(st);
|
|
}
|
|
|
|
void
|
|
mISDN_initstack(u_int *dp)
|
|
{
|
|
debug = dp;
|
|
}
|