d55d87fdff
In order to get the tun driver to account packets, we need to be able to receive packets with destructors set. To be on the safe side, I added an skb_orphan call for all protocols by default since some of them (IP in particular) cannot handle receiving packets destructors properly. Now it seems that at least one protocol (CAN) expects to be able to pass skb->sk through the rx path without getting clobbered. So this patch attempts to fix this properly by moving the skb_orphan call to where it's actually needed. In particular, I've added it to skb_set_owner_[rw] which is what most users of skb->destructor call. This is actually an improvement for tun too since it means that we only give back the amount charged to the socket when the skb is passed to another socket that will also be charged accordingly. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Oliver Hartkopp <olver@hartkopp.net> Signed-off-by: David S. Miller <davem@davemloft.net>
373 lines
9.7 KiB
C
373 lines
9.7 KiB
C
/*********************************************************************
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*
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* Filename: ircomm_lmp.c
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* Version: 1.0
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* Description: Interface between IrCOMM and IrLMP
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* Status: Stable
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sun Jun 6 20:48:27 1999
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* Modified at: Sun Dec 12 13:44:17 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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* Sources: Previous IrLPT work by Thomas Davis
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*
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* Copyright (c) 1999 Dag Brattli, All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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********************************************************************/
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#include <linux/init.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/iriap.h>
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#include <net/irda/irda_device.h> /* struct irda_skb_cb */
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#include <net/irda/ircomm_event.h>
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#include <net/irda/ircomm_lmp.h>
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/*
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* Function ircomm_lmp_connect_request (self, userdata)
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*
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*
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*
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*/
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static int ircomm_lmp_connect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info)
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{
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int ret = 0;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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/* Don't forget to refcount it - should be NULL anyway */
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if(userdata)
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skb_get(userdata);
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ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
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info->saddr, info->daddr, NULL, userdata);
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return ret;
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}
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/*
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* Function ircomm_lmp_connect_response (self, skb)
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*
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*
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*
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*/
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static int ircomm_lmp_connect_response(struct ircomm_cb *self,
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struct sk_buff *userdata)
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{
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struct sk_buff *tx_skb;
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int ret;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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/* Any userdata supplied? */
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if (userdata == NULL) {
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tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
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if (!tx_skb)
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return -ENOMEM;
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/* Reserve space for MUX and LAP header */
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skb_reserve(tx_skb, LMP_MAX_HEADER);
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} else {
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/*
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* Check that the client has reserved enough space for
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* headers
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*/
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IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
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return -1;);
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/* Don't forget to refcount it - should be NULL anyway */
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skb_get(userdata);
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tx_skb = userdata;
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}
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ret = irlmp_connect_response(self->lsap, tx_skb);
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return 0;
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}
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static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info)
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{
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struct sk_buff *tx_skb;
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int ret;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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if (!userdata) {
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tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
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if (!tx_skb)
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return -ENOMEM;
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/* Reserve space for MUX and LAP header */
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skb_reserve(tx_skb, LMP_MAX_HEADER);
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userdata = tx_skb;
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} else {
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/* Don't forget to refcount it - should be NULL anyway */
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skb_get(userdata);
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}
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ret = irlmp_disconnect_request(self->lsap, userdata);
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return ret;
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}
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/*
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* Function ircomm_lmp_flow_control (skb)
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*
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* This function is called when a data frame we have sent to IrLAP has
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* been deallocated. We do this to make sure we don't flood IrLAP with
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* frames, since we are not using the IrTTP flow control mechanism
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*/
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static void ircomm_lmp_flow_control(struct sk_buff *skb)
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{
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struct irda_skb_cb *cb;
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struct ircomm_cb *self;
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int line;
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IRDA_ASSERT(skb != NULL, return;);
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cb = (struct irda_skb_cb *) skb->cb;
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IRDA_DEBUG(2, "%s()\n", __func__ );
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line = cb->line;
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self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
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if (!self) {
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IRDA_DEBUG(2, "%s(), didn't find myself\n", __func__ );
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return;
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}
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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self->pkt_count--;
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if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
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IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __func__ );
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self->flow_status = FLOW_START;
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if (self->notify.flow_indication)
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self->notify.flow_indication(self->notify.instance,
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self, FLOW_START);
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}
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}
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/*
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* Function ircomm_lmp_data_request (self, userdata)
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*
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* Send data frame to peer device
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*
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*/
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static int ircomm_lmp_data_request(struct ircomm_cb *self,
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struct sk_buff *skb,
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int not_used)
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{
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struct irda_skb_cb *cb;
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int ret;
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IRDA_ASSERT(skb != NULL, return -1;);
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cb = (struct irda_skb_cb *) skb->cb;
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cb->line = self->line;
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IRDA_DEBUG(4, "%s(), sending frame\n", __func__ );
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/* Don't forget to refcount it - see ircomm_tty_do_softint() */
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skb_get(skb);
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skb_orphan(skb);
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skb->destructor = ircomm_lmp_flow_control;
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if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
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IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __func__ );
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self->flow_status = FLOW_STOP;
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if (self->notify.flow_indication)
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self->notify.flow_indication(self->notify.instance,
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self, FLOW_STOP);
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}
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ret = irlmp_data_request(self->lsap, skb);
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if (ret) {
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IRDA_ERROR("%s(), failed\n", __func__);
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/* irlmp_data_request already free the packet */
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}
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return ret;
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}
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/*
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* Function ircomm_lmp_data_indication (instance, sap, skb)
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*
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* Incoming data which we must deliver to the state machine, to check
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* we are still connected.
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*/
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static int ircomm_lmp_data_indication(void *instance, void *sap,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
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IRDA_ASSERT(skb != NULL, return -1;);
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ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
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/* Drop reference count - see ircomm_tty_data_indication(). */
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dev_kfree_skb(skb);
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return 0;
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}
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/*
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* Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
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* max_header_size, skb)
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*
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* Connection has been confirmed by peer device
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*
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*/
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static void ircomm_lmp_connect_confirm(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_seg_size,
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__u8 max_header_size,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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struct ircomm_info info;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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IRDA_ASSERT(skb != NULL, return;);
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IRDA_ASSERT(qos != NULL, return;);
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info.max_data_size = max_seg_size;
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info.max_header_size = max_header_size;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
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/* Drop reference count - see ircomm_tty_connect_confirm(). */
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
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* max_header_size, skb)
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*
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* Peer device wants to make a connection with us
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*
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*/
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static void ircomm_lmp_connect_indication(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_seg_size,
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__u8 max_header_size,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *)instance;
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struct ircomm_info info;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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IRDA_ASSERT(skb != NULL, return;);
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IRDA_ASSERT(qos != NULL, return;);
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info.max_data_size = max_seg_size;
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info.max_header_size = max_header_size;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
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/* Drop reference count - see ircomm_tty_connect_indication(). */
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
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*
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* Peer device has closed the connection, or the link went down for some
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* other reason
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*/
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static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
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LM_REASON reason,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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struct ircomm_info info;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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info.reason = reason;
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ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
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/* Drop reference count - see ircomm_tty_disconnect_indication(). */
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if(skb)
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_open_lsap (self)
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*
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* Open LSAP. This function will only be used when using "raw" services
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*
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*/
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int ircomm_open_lsap(struct ircomm_cb *self)
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{
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notify_t notify;
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IRDA_DEBUG(0, "%s()\n", __func__ );
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/* Register callbacks */
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irda_notify_init(¬ify);
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notify.data_indication = ircomm_lmp_data_indication;
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notify.connect_confirm = ircomm_lmp_connect_confirm;
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notify.connect_indication = ircomm_lmp_connect_indication;
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notify.disconnect_indication = ircomm_lmp_disconnect_indication;
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notify.instance = self;
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strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
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self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0);
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if (!self->lsap) {
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IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __func__ );
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return -1;
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}
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self->slsap_sel = self->lsap->slsap_sel;
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/*
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* Initialize the call-table for issuing commands
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*/
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self->issue.data_request = ircomm_lmp_data_request;
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self->issue.connect_request = ircomm_lmp_connect_request;
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self->issue.connect_response = ircomm_lmp_connect_response;
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self->issue.disconnect_request = ircomm_lmp_disconnect_request;
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return 0;
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}
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