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/*
* ng_l2cap_llpi.c
*/
/*-
* Copyright (c) Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: ng_l2cap_llpi.c,v 1.5 2003/09/08 19:11:45 max Exp $
* $FreeBSD: release/9.1.0/sys/netgraph/bluetooth/l2cap/ng_l2cap_llpi.c 187454 2009-01-19 22:06:35Z emax $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
#include <netgraph/bluetooth/include/ng_hci.h>
#include <netgraph/bluetooth/include/ng_l2cap.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_var.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_cmds.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_evnt.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_llpi.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_ulpi.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_misc.h>
/******************************************************************************
******************************************************************************
** Lower Layer Protocol (HCI) Interface module
******************************************************************************
******************************************************************************/
/*
* Send LP_ConnectReq event to the lower layer protocol. Create new connection
* descriptor and initialize it. Create LP_ConnectReq event and send it to the
* lower layer, then adjust connection state and start timer. The function WILL
* FAIL if connection to the remote unit already exists.
*/
int
ng_l2cap_lp_con_req(ng_l2cap_p l2cap, bdaddr_p bdaddr)
{
struct ng_mesg *msg = NULL;
ng_hci_lp_con_req_ep *ep = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Verify that we DO NOT have connection to the remote unit */
con = ng_l2cap_con_by_addr(l2cap, bdaddr);
if (con != NULL) {
NG_L2CAP_ALERT(
"%s: %s - unexpected LP_ConnectReq event. " \
"Connection already exists, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
return (EEXIST);
}
/* Check if lower layer protocol is still connected */
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci)) {
NG_L2CAP_ERR(
"%s: %s - hook \"%s\" is not connected or valid\n",
__func__, NG_NODE_NAME(l2cap->node), NG_L2CAP_HOOK_HCI);
return (ENOTCONN);
}
/* Create and intialize new connection descriptor */
con = ng_l2cap_new_con(l2cap, bdaddr);
if (con == NULL)
return (ENOMEM);
/* Create and send LP_ConnectReq event */
NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_CON_REQ,
sizeof(*ep), M_NOWAIT);
if (msg == NULL) {
ng_l2cap_free_con(con);
return (ENOMEM);
}
ep = (ng_hci_lp_con_req_ep *) (msg->data);
bcopy(bdaddr, &ep->bdaddr, sizeof(ep->bdaddr));
ep->link_type = NG_HCI_LINK_ACL;
con->flags |= NG_L2CAP_CON_OUTGOING;
con->state = NG_L2CAP_W4_LP_CON_CFM;
ng_l2cap_lp_timeout(con);
NG_SEND_MSG_HOOK(error, l2cap->node, msg, l2cap->hci, 0);
if (error != 0) {
if (ng_l2cap_lp_untimeout(con) == 0)
ng_l2cap_free_con(con);
/*
* Do not free connection if ng_l2cap_lp_untimeout() failed
* let timeout handler deal with it. Always return error to
* the caller.
*/
}
return (error);
} /* ng_l2cap_lp_con_req */
/*
* Process LP_ConnectCfm event from the lower layer protocol. It could be
* positive or negative. Verify remote unit address then stop the timer and
* process event.
*/
int
ng_l2cap_lp_con_cfm(ng_l2cap_p l2cap, struct ng_mesg *msg)
{
ng_hci_lp_con_cfm_ep *ep = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Check message */
if (msg->header.arglen != sizeof(*ep)) {
NG_L2CAP_ALERT(
"%s: %s - invalid LP_ConnectCfm[Neg] message size\n",
__func__, NG_NODE_NAME(l2cap->node));
error = EMSGSIZE;
goto out;
}
ep = (ng_hci_lp_con_cfm_ep *) (msg->data);
/* Check if we have requested/accepted this connection */
con = ng_l2cap_con_by_addr(l2cap, &ep->bdaddr);
if (con == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_ConnectCfm event. Connection does not exist\n",
__func__, NG_NODE_NAME(l2cap->node));
error = ENOENT;
goto out;
}
/* Check connection state */
if (con->state != NG_L2CAP_W4_LP_CON_CFM) {
NG_L2CAP_ALERT(
"%s: %s - unexpected LP_ConnectCfm event. " \
"Invalid connection state, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
error = EINVAL;
goto out;
}
/*
* Looks like it is our confirmation. It is safe now to cancel
* connection timer and notify upper layer. If timeout already
* happened then ignore connection confirmation and let timeout
* handle that.
*/
if ((error = ng_l2cap_lp_untimeout(con)) != 0)
goto out;
if (ep->status == 0) {
con->state = NG_L2CAP_CON_OPEN;
con->con_handle = ep->con_handle;
ng_l2cap_lp_deliver(con);
} else /* Negative confirmation - remove connection descriptor */
ng_l2cap_con_fail(con, ep->status);
out:
return (error);
} /* ng_l2cap_lp_con_cfm */
/*
* Process LP_ConnectInd event from the lower layer protocol. This is a good
* place to put some extra check on remote unit address and/or class. We could
* even forward this information to control hook (or check against internal
* black list) and thus implement some kind of firewall. But for now be simple
* and create new connection descriptor, start timer and send LP_ConnectRsp
* event (i.e. accept connection).
*/
int
ng_l2cap_lp_con_ind(ng_l2cap_p l2cap, struct ng_mesg *msg)
{
ng_hci_lp_con_ind_ep *ep = NULL;
ng_hci_lp_con_rsp_ep *rp = NULL;
struct ng_mesg *rsp = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Check message */
if (msg->header.arglen != sizeof(*ep)) {
NG_L2CAP_ALERT(
"%s: %s - invalid LP_ConnectInd message size\n",
__func__, NG_NODE_NAME(l2cap->node));
return (EMSGSIZE);
}
ep = (ng_hci_lp_con_ind_ep *) (msg->data);
/* Make sure we have only one connection to the remote unit */
con = ng_l2cap_con_by_addr(l2cap, &ep->bdaddr);
if (con != NULL) {
NG_L2CAP_ALERT(
"%s: %s - unexpected LP_ConnectInd event. " \
"Connection already exists, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
return (EEXIST);
}
/* Check if lower layer protocol is still connected */
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci)) {
NG_L2CAP_ERR(
"%s: %s - hook \"%s\" is not connected or valid",
__func__, NG_NODE_NAME(l2cap->node), NG_L2CAP_HOOK_HCI);
return (ENOTCONN);
}
/* Create and intialize new connection descriptor */
con = ng_l2cap_new_con(l2cap, &ep->bdaddr);
if (con == NULL)
return (ENOMEM);
/* Create and send LP_ConnectRsp event */
NG_MKMESSAGE(rsp, NGM_HCI_COOKIE, NGM_HCI_LP_CON_RSP,
sizeof(*rp), M_NOWAIT);
if (rsp == NULL) {
ng_l2cap_free_con(con);
return (ENOMEM);
}
rp = (ng_hci_lp_con_rsp_ep *)(rsp->data);
rp->status = 0x00; /* accept connection */
rp->link_type = NG_HCI_LINK_ACL;
bcopy(&ep->bdaddr, &rp->bdaddr, sizeof(rp->bdaddr));
con->state = NG_L2CAP_W4_LP_CON_CFM;
ng_l2cap_lp_timeout(con);
NG_SEND_MSG_HOOK(error, l2cap->node, rsp, l2cap->hci, 0);
if (error != 0) {
if (ng_l2cap_lp_untimeout(con) == 0)
ng_l2cap_free_con(con);
/*
* Do not free connection if ng_l2cap_lp_untimeout() failed
* let timeout handler deal with it. Always return error to
* the caller.
*/
}
return (error);
} /* ng_l2cap_lp_con_ind */
/*
* Process LP_DisconnectInd event from the lower layer protocol. We have been
* disconnected from the remote unit. So notify the upper layer protocol.
*/
int
ng_l2cap_lp_discon_ind(ng_l2cap_p l2cap, struct ng_mesg *msg)
{
ng_hci_lp_discon_ind_ep *ep = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Check message */
if (msg->header.arglen != sizeof(*ep)) {
NG_L2CAP_ALERT(
"%s: %s - invalid LP_DisconnectInd message size\n",
__func__, NG_NODE_NAME(l2cap->node));
error = EMSGSIZE;
goto out;
}
ep = (ng_hci_lp_discon_ind_ep *) (msg->data);
/* Check if we have this connection */
con = ng_l2cap_con_by_handle(l2cap, ep->con_handle);
if (con == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_DisconnectInd event. " \
"Connection does not exist, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), ep->con_handle);
error = ENOENT;
goto out;
}
/* XXX Verify connection state -- do we need to check this? */
if (con->state != NG_L2CAP_CON_OPEN) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_DisconnectInd event. " \
"Invalid connection state, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
error = EINVAL;
goto out;
}
/*
* Notify upper layer and remove connection
* Note: The connection could have auto disconnect timeout set. Try
* to remove it. If auto disconnect timeout happened then ignore
* disconnect indication and let timeout handle that.
*/
if (con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO)
if ((error = ng_l2cap_discon_untimeout(con)) != 0)
return (error);
ng_l2cap_con_fail(con, ep->reason);
out:
return (error);
} /* ng_l2cap_lp_discon_ind */
/*
* Send LP_QoSSetupReq event to the lower layer protocol
*/
int
ng_l2cap_lp_qos_req(ng_l2cap_p l2cap, u_int16_t con_handle,
ng_l2cap_flow_p flow)
{
struct ng_mesg *msg = NULL;
ng_hci_lp_qos_req_ep *ep = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Verify that we have this connection */
con = ng_l2cap_con_by_handle(l2cap, con_handle);
if (con == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_QoSSetupReq event. " \
"Connection does not exist, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con_handle);
return (ENOENT);
}
/* Verify connection state */
if (con->state != NG_L2CAP_CON_OPEN) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_QoSSetupReq event. " \
"Invalid connection state, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
return (EINVAL);
}
/* Check if lower layer protocol is still connected */
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci)) {
NG_L2CAP_ERR(
"%s: %s - hook \"%s\" is not connected or valid",
__func__, NG_NODE_NAME(l2cap->node), NG_L2CAP_HOOK_HCI);
return (ENOTCONN);
}
/* Create and send LP_QoSSetupReq event */
NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_QOS_REQ,
sizeof(*ep), M_NOWAIT);
if (msg == NULL)
return (ENOMEM);
ep = (ng_hci_lp_qos_req_ep *) (msg->data);
ep->con_handle = con_handle;
ep->flags = flow->flags;
ep->service_type = flow->service_type;
ep->token_rate = flow->token_rate;
ep->peak_bandwidth = flow->peak_bandwidth;
ep->latency = flow->latency;
ep->delay_variation = flow->delay_variation;
NG_SEND_MSG_HOOK(error, l2cap->node, msg, l2cap->hci, 0);
return (error);
} /* ng_l2cap_lp_con_req */
/*
* Process LP_QoSSetupCfm from the lower layer protocol
*/
int
ng_l2cap_lp_qos_cfm(ng_l2cap_p l2cap, struct ng_mesg *msg)
{
ng_hci_lp_qos_cfm_ep *ep = NULL;
int error = 0;
/* Check message */
if (msg->header.arglen != sizeof(*ep)) {
NG_L2CAP_ALERT(
"%s: %s - invalid LP_QoSSetupCfm[Neg] message size\n",
__func__, NG_NODE_NAME(l2cap->node));
error = EMSGSIZE;
goto out;
}
ep = (ng_hci_lp_qos_cfm_ep *) (msg->data);
/* XXX FIXME do something */
out:
return (error);
} /* ng_l2cap_lp_qos_cfm */
/*
* Process LP_QoSViolationInd event from the lower layer protocol. Lower
* layer protocol has detected QoS Violation, so we MUST notify the
* upper layer.
*/
int
ng_l2cap_lp_qos_ind(ng_l2cap_p l2cap, struct ng_mesg *msg)
{
ng_hci_lp_qos_ind_ep *ep = NULL;
ng_l2cap_con_p con = NULL;
int error = 0;
/* Check message */
if (msg->header.arglen != sizeof(*ep)) {
NG_L2CAP_ALERT(
"%s: %s - invalid LP_QoSViolation message size\n",
__func__, NG_NODE_NAME(l2cap->node));
error = EMSGSIZE;
goto out;
}
ep = (ng_hci_lp_qos_ind_ep *) (msg->data);
/* Check if we have this connection */
con = ng_l2cap_con_by_handle(l2cap, ep->con_handle);
if (con == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_QoSViolationInd event. " \
"Connection does not exist, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), ep->con_handle);
error = ENOENT;
goto out;
}
/* Verify connection state */
if (con->state != NG_L2CAP_CON_OPEN) {
NG_L2CAP_ERR(
"%s: %s - unexpected LP_QoSViolationInd event. " \
"Invalid connection state, state=%d, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state,
con->con_handle);
error = EINVAL;
goto out;
}
/* XXX FIXME Notify upper layer and terminate channels if required */
out:
return (error);
} /* ng_l2cap_qos_ind */
/*
* Prepare L2CAP packet. Prepend packet with L2CAP packet header and then
* segment it according to HCI MTU.
*/
int
ng_l2cap_lp_send(ng_l2cap_con_p con, u_int16_t dcid, struct mbuf *m0)
{
ng_l2cap_p l2cap = con->l2cap;
ng_l2cap_hdr_t *l2cap_hdr = NULL;
ng_hci_acldata_pkt_t *acl_hdr = NULL;
struct mbuf *m_last = NULL, *m = NULL;
int len, flag = NG_HCI_PACKET_START;
KASSERT((con->tx_pkt == NULL),
("%s: %s - another packet pending?!\n", __func__, NG_NODE_NAME(l2cap->node)));
KASSERT((l2cap->pkt_size > 0),
("%s: %s - invalid l2cap->pkt_size?!\n", __func__, NG_NODE_NAME(l2cap->node)));
/* Prepend mbuf with L2CAP header */
m0 = ng_l2cap_prepend(m0, sizeof(*l2cap_hdr));
if (m0 == NULL) {
NG_L2CAP_ALERT(
"%s: %s - ng_l2cap_prepend(%zd) failed\n",
__func__, NG_NODE_NAME(l2cap->node),
sizeof(*l2cap_hdr));
goto fail;
}
l2cap_hdr = mtod(m0, ng_l2cap_hdr_t *);
l2cap_hdr->length = htole16(m0->m_pkthdr.len - sizeof(*l2cap_hdr));
l2cap_hdr->dcid = htole16(dcid);
/*
* Segment single L2CAP packet according to the HCI layer MTU. Convert
* each segment into ACL data packet and prepend it with ACL data packet
* header. Link all segments together via m_nextpkt link.
*
* XXX BC (Broadcast flag) will always be 0 (zero).
*/
while (m0 != NULL) {
/* Check length of the packet against HCI MTU */
len = m0->m_pkthdr.len;
if (len > l2cap->pkt_size) {
m = m_split(m0, l2cap->pkt_size, M_DONTWAIT);
if (m == NULL) {
NG_L2CAP_ALERT(
"%s: %s - m_split(%d) failed\n", __func__, NG_NODE_NAME(l2cap->node),
l2cap->pkt_size);
goto fail;
}
len = l2cap->pkt_size;
}
/* Convert packet fragment into ACL data packet */
m0 = ng_l2cap_prepend(m0, sizeof(*acl_hdr));
if (m0 == NULL) {
NG_L2CAP_ALERT(
"%s: %s - ng_l2cap_prepend(%zd) failed\n",
__func__, NG_NODE_NAME(l2cap->node),
sizeof(*acl_hdr));
goto fail;
}
acl_hdr = mtod(m0, ng_hci_acldata_pkt_t *);
acl_hdr->type = NG_HCI_ACL_DATA_PKT;
acl_hdr->length = htole16(len);
acl_hdr->con_handle = htole16(NG_HCI_MK_CON_HANDLE(
con->con_handle, flag, 0));
/* Add fragment to the chain */
m0->m_nextpkt = NULL;
if (con->tx_pkt == NULL)
con->tx_pkt = m_last = m0;
else {
m_last->m_nextpkt = m0;
m_last = m0;
}
NG_L2CAP_INFO(
"%s: %s - attaching ACL packet, con_handle=%d, PB=%#x, length=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->con_handle,
flag, len);
m0 = m;
m = NULL;
flag = NG_HCI_PACKET_FRAGMENT;
}
return (0);
fail:
NG_FREE_M(m0);
NG_FREE_M(m);
while (con->tx_pkt != NULL) {
m = con->tx_pkt->m_nextpkt;
m_freem(con->tx_pkt);
con->tx_pkt = m;
}
return (ENOBUFS);
} /* ng_l2cap_lp_send */
/*
* Receive ACL data packet from the HCI layer. First strip ACL packet header
* and get connection handle, PB (Packet Boundary) flag and payload length.
* Then find connection descriptor and verify its state. Then process ACL
* packet as follows.
*
* 1) If we got first segment (pb == NG_HCI_PACKET_START) then extract L2CAP
* header and get total length of the L2CAP packet. Then start new L2CAP
* packet.
*
* 2) If we got other (then first :) segment (pb == NG_HCI_PACKET_FRAGMENT)
* then add segment to the packet.
*/
int
ng_l2cap_lp_receive(ng_l2cap_p l2cap, struct mbuf *m)
{
ng_hci_acldata_pkt_t *acl_hdr = NULL;
ng_l2cap_hdr_t *l2cap_hdr = NULL;
ng_l2cap_con_p con = NULL;
u_int16_t con_handle, length, pb;
int error = 0;
/* Check ACL data packet */
if (m->m_pkthdr.len < sizeof(*acl_hdr)) {
NG_L2CAP_ERR(
"%s: %s - invalid ACL data packet. Packet too small, length=%d\n",
__func__, NG_NODE_NAME(l2cap->node), m->m_pkthdr.len);
error = EMSGSIZE;
goto drop;
}
/* Strip ACL data packet header */
NG_L2CAP_M_PULLUP(m, sizeof(*acl_hdr));
if (m == NULL)
return (ENOBUFS);
acl_hdr = mtod(m, ng_hci_acldata_pkt_t *);
m_adj(m, sizeof(*acl_hdr));
/* Get ACL connection handle, PB flag and payload length */
acl_hdr->con_handle = le16toh(acl_hdr->con_handle);
con_handle = NG_HCI_CON_HANDLE(acl_hdr->con_handle);
pb = NG_HCI_PB_FLAG(acl_hdr->con_handle);
length = le16toh(acl_hdr->length);
NG_L2CAP_INFO(
"%s: %s - got ACL data packet, con_handle=%d, PB=%#x, length=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con_handle, pb, length);
/* Get connection descriptor */
con = ng_l2cap_con_by_handle(l2cap, con_handle);
if (con == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected ACL data packet. " \
"Connection does not exist, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con_handle);
error = ENOENT;
goto drop;
}
/* Verify connection state */
if (con->state != NG_L2CAP_CON_OPEN) {
NG_L2CAP_ERR(
"%s: %s - unexpected ACL data packet. Invalid connection state=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->state);
error = EHOSTDOWN;
goto drop;
}
/* Process packet */
if (pb == NG_HCI_PACKET_START) {
if (con->rx_pkt != NULL) {
NG_L2CAP_ERR(
"%s: %s - dropping incomplete L2CAP packet, got %d bytes, want %d bytes\n",
__func__, NG_NODE_NAME(l2cap->node),
con->rx_pkt->m_pkthdr.len, con->rx_pkt_len);
NG_FREE_M(con->rx_pkt);
con->rx_pkt_len = 0;
}
/* Get L2CAP header */
if (m->m_pkthdr.len < sizeof(*l2cap_hdr)) {
NG_L2CAP_ERR(
"%s: %s - invalid L2CAP packet start fragment. Packet too small, length=%d\n",
__func__, NG_NODE_NAME(l2cap->node),
m->m_pkthdr.len);
error = EMSGSIZE;
goto drop;
}
NG_L2CAP_M_PULLUP(m, sizeof(*l2cap_hdr));
if (m == NULL)
return (ENOBUFS);
l2cap_hdr = mtod(m, ng_l2cap_hdr_t *);
NG_L2CAP_INFO(
"%s: %s - staring new L2CAP packet, con_handle=%d, length=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con_handle,
le16toh(l2cap_hdr->length));
/* Start new L2CAP packet */
con->rx_pkt = m;
con->rx_pkt_len = le16toh(l2cap_hdr->length)+sizeof(*l2cap_hdr);
} else if (pb == NG_HCI_PACKET_FRAGMENT) {
if (con->rx_pkt == NULL) {
NG_L2CAP_ERR(
"%s: %s - unexpected ACL data packet fragment, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node),
con->con_handle);
goto drop;
}
/* Add fragment to the L2CAP packet */
m_cat(con->rx_pkt, m);
con->rx_pkt->m_pkthdr.len += length;
} else {
NG_L2CAP_ERR(
"%s: %s - invalid ACL data packet. Invalid PB flag=%#x\n",
__func__, NG_NODE_NAME(l2cap->node), pb);
error = EINVAL;
goto drop;
}
con->rx_pkt_len -= length;
if (con->rx_pkt_len < 0) {
NG_L2CAP_ALERT(
"%s: %s - packet length mismatch. Got %d bytes, offset %d bytes\n",
__func__, NG_NODE_NAME(l2cap->node),
con->rx_pkt->m_pkthdr.len, con->rx_pkt_len);
NG_FREE_M(con->rx_pkt);
con->rx_pkt_len = 0;
} else if (con->rx_pkt_len == 0) {
/* OK, we have got complete L2CAP packet, so process it */
error = ng_l2cap_receive(con);
con->rx_pkt = NULL;
con->rx_pkt_len = 0;
}
return (error);
drop:
NG_FREE_M(m);
return (error);
} /* ng_l2cap_lp_receive */
/*
* Send queued ACL packets to the HCI layer
*/
void
ng_l2cap_lp_deliver(ng_l2cap_con_p con)
{
ng_l2cap_p l2cap = con->l2cap;
struct mbuf *m = NULL;
int error;
/* Check connection */
if (con->state != NG_L2CAP_CON_OPEN)
return;
if (con->tx_pkt == NULL)
ng_l2cap_con_wakeup(con);
if (con->tx_pkt == NULL)
return;
/* Check if lower layer protocol is still connected */
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci)) {
NG_L2CAP_ERR(
"%s: %s - hook \"%s\" is not connected or valid",
__func__, NG_NODE_NAME(l2cap->node), NG_L2CAP_HOOK_HCI);
goto drop; /* XXX what to do with "pending"? */
}
/* Send ACL data packets */
while (con->pending < con->l2cap->num_pkts && con->tx_pkt != NULL) {
m = con->tx_pkt;
con->tx_pkt = con->tx_pkt->m_nextpkt;
m->m_nextpkt = NULL;
NG_L2CAP_INFO(
"%s: %s - sending ACL packet, con_handle=%d, len=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->con_handle,
m->m_pkthdr.len);
NG_SEND_DATA_ONLY(error, l2cap->hci, m);
if (error != 0) {
NG_L2CAP_ERR(
"%s: %s - could not send ACL data packet, con_handle=%d, error=%d\n",
__func__, NG_NODE_NAME(l2cap->node),
con->con_handle, error);
goto drop; /* XXX what to do with "pending"? */
}
con->pending ++;
}
NG_L2CAP_INFO(
"%s: %s - %d ACL packets have been sent, con_handle=%d\n",
__func__, NG_NODE_NAME(l2cap->node), con->pending,
con->con_handle);
return;
drop:
while (con->tx_pkt != NULL) {
m = con->tx_pkt->m_nextpkt;
m_freem(con->tx_pkt);
con->tx_pkt = m;
}
} /* ng_l2cap_lp_deliver */
/*
* Process connection timeout. Remove connection from the list. If there
* are any channels that wait for the connection then notify them. Free
* connection descriptor.
*/
void
ng_l2cap_process_lp_timeout(node_p node, hook_p hook, void *arg1, int con_handle)
{
ng_l2cap_p l2cap = NULL;
ng_l2cap_con_p con = NULL;
if (NG_NODE_NOT_VALID(node)) {
printf("%s: Netgraph node is not valid\n", __func__);
return;
}
l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
con = ng_l2cap_con_by_handle(l2cap, con_handle);
if (con == NULL) {
NG_L2CAP_ALERT(
"%s: %s - could not find connection, con_handle=%d\n",
__func__, NG_NODE_NAME(node), con_handle);
return;
}
if (!(con->flags & NG_L2CAP_CON_LP_TIMO)) {
NG_L2CAP_ALERT(
"%s: %s - no pending LP timeout, con_handle=%d, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(node), con_handle, con->state,
con->flags);
return;
}
/*
* Notify channels that connection has timed out. This will remove
* connection, channels and pending commands.
*/
con->flags &= ~NG_L2CAP_CON_LP_TIMO;
ng_l2cap_con_fail(con, NG_L2CAP_TIMEOUT);
} /* ng_l2cap_process_lp_timeout */
/*
* Process auto disconnect timeout and send LP_DisconReq event to the
* lower layer protocol
*/
void
ng_l2cap_process_discon_timeout(node_p node, hook_p hook, void *arg1, int con_handle)
{
ng_l2cap_p l2cap = NULL;
ng_l2cap_con_p con = NULL;
struct ng_mesg *msg = NULL;
ng_hci_lp_discon_req_ep *ep = NULL;
int error;
if (NG_NODE_NOT_VALID(node)) {
printf("%s: Netgraph node is not valid\n", __func__);
return;
}
l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
con = ng_l2cap_con_by_handle(l2cap, con_handle);
if (con == NULL) {
NG_L2CAP_ALERT(
"%s: %s - could not find connection, con_handle=%d\n",
__func__, NG_NODE_NAME(node), con_handle);
return;
}
if (!(con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO)) {
NG_L2CAP_ALERT(
"%s: %s - no pending disconnect timeout, con_handle=%d, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(node), con_handle, con->state,
con->flags);
return;
}
con->flags &= ~NG_L2CAP_CON_AUTO_DISCON_TIMO;
/* Check if lower layer protocol is still connected */
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci)) {
NG_L2CAP_ERR(
"%s: %s - hook \"%s\" is not connected or valid\n",
__func__, NG_NODE_NAME(l2cap->node), NG_L2CAP_HOOK_HCI);
return;
}
/* Create and send LP_DisconReq event */
NG_MKMESSAGE(msg, NGM_HCI_COOKIE, NGM_HCI_LP_DISCON_REQ,
sizeof(*ep), M_NOWAIT);
if (msg == NULL)
return;
ep = (ng_hci_lp_discon_req_ep *) (msg->data);
ep->con_handle = con->con_handle;
ep->reason = 0x13; /* User Ended Connection */
NG_SEND_MSG_HOOK(error, l2cap->node, msg, l2cap->hci, 0);
} /* ng_l2cap_process_discon_timeout */