/* * * Author Karsten Keil <kkeil@novell.com> * * Copyright 2008 by Karsten Keil <kkeil@novell.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program 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 <linux/slab.h> #include <linux/mISDNif.h> #include <linux/kthread.h> #include <linux/sched.h> #include "core.h" static u_int *debug; static inline void _queue_message(struct mISDNstack *st, struct sk_buff *skb) { struct mISDNhead *hh = mISDN_HEAD_P(skb); if (*debug & DEBUG_QUEUE_FUNC) printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n", __func__, hh->prim, hh->id, skb); skb_queue_tail(&st->msgq, skb); if (likely(!test_bit(mISDN_STACK_STOPPED, &st->status))) { test_and_set_bit(mISDN_STACK_WORK, &st->status); wake_up_interruptible(&st->workq); } } static int mISDN_queue_message(struct mISDNchannel *ch, struct sk_buff *skb) { _queue_message(ch->st, skb); return 0; } static struct mISDNchannel * get_channel4id(struct mISDNstack *st, u_int id) { struct mISDNchannel *ch; mutex_lock(&st->lmutex); list_for_each_entry(ch, &st->layer2, list) { if (id == ch->nr) goto unlock; } ch = NULL; unlock: mutex_unlock(&st->lmutex); return ch; } static void send_socklist(struct mISDN_sock_list *sl, struct sk_buff *skb) { struct sock *sk; struct sk_buff *cskb = NULL; read_lock(&sl->lock); sk_for_each(sk, &sl->head) { if (sk->sk_state != MISDN_BOUND) continue; if (!cskb) cskb = skb_copy(skb, GFP_KERNEL); if (!cskb) { printk(KERN_WARNING "%s no skb\n", __func__); break; } if (!sock_queue_rcv_skb(sk, cskb)) cskb = NULL; } read_unlock(&sl->lock); if (cskb) dev_kfree_skb(cskb); } static void send_layer2(struct mISDNstack *st, struct sk_buff *skb) { struct sk_buff *cskb; struct mISDNhead *hh = mISDN_HEAD_P(skb); struct mISDNchannel *ch; int ret; if (!st) return; mutex_lock(&st->lmutex); if ((hh->id & MISDN_ID_ADDR_MASK) == MISDN_ID_ANY) { /* L2 for all */ list_for_each_entry(ch, &st->layer2, list) { if (list_is_last(&ch->list, &st->layer2)) { cskb = skb; skb = NULL; } else { cskb = skb_copy(skb, GFP_KERNEL); } if (cskb) { ret = ch->send(ch, cskb); if (ret) { if (*debug & DEBUG_SEND_ERR) printk(KERN_DEBUG "%s ch%d prim(%x) addr(%x)" " err %d\n", __func__, ch->nr, hh->prim, ch->addr, ret); dev_kfree_skb(cskb); } } else { printk(KERN_WARNING "%s ch%d addr %x no mem\n", __func__, ch->nr, ch->addr); goto out; } } } else { list_for_each_entry(ch, &st->layer2, list) { if ((hh->id & MISDN_ID_ADDR_MASK) == ch->addr) { ret = ch->send(ch, skb); if (!ret) skb = NULL; goto out; } } ret = st->dev->teimgr->ctrl(st->dev->teimgr, CHECK_DATA, skb); if (!ret) skb = NULL; else if (*debug & DEBUG_SEND_ERR) printk(KERN_DEBUG "%s mgr prim(%x) err %d\n", __func__, hh->prim, ret); } out: mutex_unlock(&st->lmutex); if (skb) dev_kfree_skb(skb); } static inline int send_msg_to_layer(struct mISDNstack *st, struct sk_buff *skb) { struct mISDNhead *hh = mISDN_HEAD_P(skb); struct mISDNchannel *ch; int lm; lm = hh->prim & MISDN_LAYERMASK; if (*debug & DEBUG_QUEUE_FUNC) printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n", __func__, hh->prim, hh->id, skb); if (lm == 0x1) { if (!hlist_empty(&st->l1sock.head)) { __net_timestamp(skb); send_socklist(&st->l1sock, skb); } return st->layer1->send(st->layer1, skb); } else if (lm == 0x2) { if (!hlist_empty(&st->l1sock.head)) send_socklist(&st->l1sock, skb); send_layer2(st, skb); return 0; } else if (lm == 0x4) { ch = get_channel4id(st, hh->id); if (ch) return ch->send(ch, skb); else printk(KERN_WARNING "%s: dev(%s) prim(%x) id(%x) no channel\n", __func__, dev_name(&st->dev->dev), hh->prim, hh->id); } else if (lm == 0x8) { WARN_ON(lm == 0x8); ch = get_channel4id(st, hh->id); if (ch) return ch->send(ch, skb); else printk(KERN_WARNING "%s: dev(%s) prim(%x) id(%x) no channel\n", __func__, dev_name(&st->dev->dev), hh->prim, hh->id); } else { /* broadcast not handled yet */ printk(KERN_WARNING "%s: dev(%s) prim %x not delivered\n", __func__, dev_name(&st->dev->dev), hh->prim); } return -ESRCH; } static void do_clear_stack(struct mISDNstack *st) { } static int mISDNStackd(void *data) { struct mISDNstack *st = data; #ifdef MISDN_MSG_STATS cputime_t utime, stime; #endif int err = 0; sigfillset(¤t->blocked); if (*debug & DEBUG_MSG_THREAD) printk(KERN_DEBUG "mISDNStackd %s started\n", dev_name(&st->dev->dev)); if (st->notify != NULL) { complete(st->notify); st->notify = NULL; } for (;;) { struct sk_buff *skb; if (unlikely(test_bit(mISDN_STACK_STOPPED, &st->status))) { test_and_clear_bit(mISDN_STACK_WORK, &st->status); test_and_clear_bit(mISDN_STACK_RUNNING, &st->status); } else test_and_set_bit(mISDN_STACK_RUNNING, &st->status); while (test_bit(mISDN_STACK_WORK, &st->status)) { skb = skb_dequeue(&st->msgq); if (!skb) { test_and_clear_bit(mISDN_STACK_WORK, &st->status); /* test if a race happens */ skb = skb_dequeue(&st->msgq); if (!skb) continue; test_and_set_bit(mISDN_STACK_WORK, &st->status); } #ifdef MISDN_MSG_STATS st->msg_cnt++; #endif err = send_msg_to_layer(st, skb); if (unlikely(err)) { if (*debug & DEBUG_SEND_ERR) printk(KERN_DEBUG "%s: %s prim(%x) id(%x) " "send call(%d)\n", __func__, dev_name(&st->dev->dev), mISDN_HEAD_PRIM(skb), mISDN_HEAD_ID(skb), err); dev_kfree_skb(skb); continue; } if (unlikely(test_bit(mISDN_STACK_STOPPED, &st->status))) { test_and_clear_bit(mISDN_STACK_WORK, &st->status); test_and_clear_bit(mISDN_STACK_RUNNING, &st->status); break; } } if (test_bit(mISDN_STACK_CLEARING, &st->status)) { test_and_set_bit(mISDN_STACK_STOPPED, &st->status); test_and_clear_bit(mISDN_STACK_RUNNING, &st->status); do_clear_stack(st); test_and_clear_bit(mISDN_STACK_CLEARING, &st->status); test_and_set_bit(mISDN_STACK_RESTART, &st->status); } if (test_and_clear_bit(mISDN_STACK_RESTART, &st->status)) { test_and_clear_bit(mISDN_STACK_STOPPED, &st->status); test_and_set_bit(mISDN_STACK_RUNNING, &st->status); if (!skb_queue_empty(&st->msgq)) test_and_set_bit(mISDN_STACK_WORK, &st->status); } if (test_bit(mISDN_STACK_ABORT, &st->status)) break; if (st->notify != NULL) { complete(st->notify); st->notify = NULL; } #ifdef MISDN_MSG_STATS st->sleep_cnt++; #endif test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status); wait_event_interruptible(st->workq, (st->status & mISDN_STACK_ACTION_MASK)); if (*debug & DEBUG_MSG_THREAD) printk(KERN_DEBUG "%s: %s wake status %08lx\n", __func__, dev_name(&st->dev->dev), st->status); test_and_set_bit(mISDN_STACK_ACTIVE, &st->status); test_and_clear_bit(mISDN_STACK_WAKEUP, &st->status); if (test_bit(mISDN_STACK_STOPPED, &st->status)) { test_and_clear_bit(mISDN_STACK_RUNNING, &st->status); #ifdef MISDN_MSG_STATS st->stopped_cnt++; #endif } } #ifdef MISDN_MSG_STATS printk(KERN_DEBUG "mISDNStackd daemon for %s proceed %d " "msg %d sleep %d stopped\n", dev_name(&st->dev->dev), st->msg_cnt, st->sleep_cnt, st->stopped_cnt); task_cputime(st->thread, &utime, &stime); printk(KERN_DEBUG "mISDNStackd daemon for %s utime(%ld) stime(%ld)\n", dev_name(&st->dev->dev), utime, stime); printk(KERN_DEBUG "mISDNStackd daemon for %s nvcsw(%ld) nivcsw(%ld)\n", dev_name(&st->dev->dev), st->thread->nvcsw, st->thread->nivcsw); printk(KERN_DEBUG "mISDNStackd daemon for %s killed now\n", dev_name(&st->dev->dev)); #endif test_and_set_bit(mISDN_STACK_KILLED, &st->status); test_and_clear_bit(mISDN_STACK_RUNNING, &st->status); test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status); test_and_clear_bit(mISDN_STACK_ABORT, &st->status); skb_queue_purge(&st->msgq); st->thread = NULL; if (st->notify != NULL) { complete(st->notify); st->notify = NULL; } return 0; } static int l1_receive(struct mISDNchannel *ch, struct sk_buff *skb) { if (!ch->st) return -ENODEV; __net_timestamp(skb); _queue_message(ch->st, skb); return 0; } void set_channel_address(struct mISDNchannel *ch, u_int sapi, u_int tei) { ch->addr = sapi | (tei << 8); } void __add_layer2(struct mISDNchannel *ch, struct mISDNstack *st) { list_add_tail(&ch->list, &st->layer2); } void add_layer2(struct mISDNchannel *ch, struct mISDNstack *st) { mutex_lock(&st->lmutex); __add_layer2(ch, st); mutex_unlock(&st->lmutex); } static int st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg) { if (!ch->st || !ch->st->layer1) return -EINVAL; return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg); } int create_stack(struct mISDNdevice *dev) { struct mISDNstack *newst; int err; DECLARE_COMPLETION_ONSTACK(done); newst = kzalloc(sizeof(struct mISDNstack), GFP_KERNEL); if (!newst) { printk(KERN_ERR "kmalloc mISDN_stack failed\n"); return -ENOMEM; } newst->dev = dev; INIT_LIST_HEAD(&newst->layer2); INIT_HLIST_HEAD(&newst->l1sock.head); rwlock_init(&newst->l1sock.lock); init_waitqueue_head(&newst->workq); skb_queue_head_init(&newst->msgq); mutex_init(&newst->lmutex); dev->D.st = newst; err = create_teimanager(dev); if (err) { printk(KERN_ERR "kmalloc teimanager failed\n"); kfree(newst); return err; } dev->teimgr->peer = &newst->own; dev->teimgr->recv = mISDN_queue_message; dev->teimgr->st = newst; newst->layer1 = &dev->D; dev->D.recv = l1_receive; dev->D.peer = &newst->own; newst->own.st = newst; newst->own.ctrl = st_own_ctrl; newst->own.send = mISDN_queue_message; newst->own.recv = mISDN_queue_message; if (*debug & DEBUG_CORE_FUNC) printk(KERN_DEBUG "%s: st(%s)\n", __func__, dev_name(&newst->dev->dev)); newst->notify = &done; newst->thread = kthread_run(mISDNStackd, (void *)newst, "mISDN_%s", dev_name(&newst->dev->dev)); if (IS_ERR(newst->thread)) { err = PTR_ERR(newst->thread); printk(KERN_ERR "mISDN:cannot create kernel thread for %s (%d)\n", dev_name(&newst->dev->dev), err); delete_teimanager(dev->teimgr); kfree(newst); } else wait_for_completion(&done); return err; } int connect_layer1(struct mISDNdevice *dev, struct mISDNchannel *ch, u_int protocol, struct sockaddr_mISDN *adr) { struct mISDN_sock *msk = container_of(ch, struct mISDN_sock, ch); 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); switch (protocol) { case ISDN_P_NT_S0: case ISDN_P_NT_E1: case ISDN_P_TE_S0: case ISDN_P_TE_E1: ch->recv = mISDN_queue_message; ch->peer = &dev->D.st->own; ch->st = dev->D.st; rq.protocol = protocol; rq.adr.channel = adr->channel; err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq); printk(KERN_DEBUG "%s: ret %d (dev %d)\n", __func__, err, dev->id); if (err) return err; write_lock_bh(&dev->D.st->l1sock.lock); sk_add_node(&msk->sk, &dev->D.st->l1sock.head); write_unlock_bh(&dev->D.st->l1sock.lock); break; default: return -ENOPROTOOPT; } return 0; } int connect_Bstack(struct mISDNdevice *dev, struct mISDNchannel *ch, u_int protocol, struct sockaddr_mISDN *adr) { struct channel_req rq, rq2; int pmask, err; struct Bprotocol *bp; 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); ch->st = dev->D.st; pmask = 1 << (protocol & ISDN_P_B_MASK); if (pmask & dev->Bprotocols) { 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; 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; }