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[Bluetooth] Fix L2CAP configuration parameter handling

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The L2CAP configuration parameter handling was missing the support
for rejecting unknown options. The capability to reject unknown
options is mandatory since the Bluetooth 1.2 specification. This
patch implements its and also simplifies the parameter parsing.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2007-05-24 14:27:19 +02:00
parent fd184ab428
commit 5dee9e7c4c
2 changed files with 86 additions and 66 deletions
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8
include/net/bluetooth/l2cap.h
View File

@ -129,8 +129,10 @@ struct l2cap_conf_rsp {
__u8 data[0];
} __attribute__ ((packed));
#define L2CAP_CONF_SUCCESS 0x00
#define L2CAP_CONF_UNACCEPT 0x01
#define L2CAP_CONF_SUCCESS 0x0000
#define L2CAP_CONF_UNACCEPT 0x0001
#define L2CAP_CONF_REJECT 0x0002
#define L2CAP_CONF_UNKNOWN 0x0003
struct l2cap_conf_opt {
__u8 type;
@ -215,6 +217,8 @@ struct l2cap_pinfo {
__u32 link_mode;
__u8 conf_req[64];
__u8 conf_len;
__u8 conf_state;
__u8 conf_retry;
__u16 conf_mtu;

134
net/bluetooth/l2cap.c
View File

@ -507,6 +507,7 @@ static void l2cap_sock_init(struct sock *sk, struct sock *parent)
}
/* Default config options */
pi->conf_len = 0;
pi->conf_mtu = L2CAP_DEFAULT_MTU;
pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
}
@ -1271,42 +1272,6 @@ static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned
return len;
}
static inline void l2cap_parse_conf_req(struct sock *sk, void *data, int len)
{
int type, hint, olen;
unsigned long val;
void *ptr = data;
BT_DBG("sk %p len %d", sk, len);
while (len >= L2CAP_CONF_OPT_SIZE) {
len -= l2cap_get_conf_opt(&ptr, &type, &olen, &val);
hint = type & 0x80;
type &= 0x7f;
switch (type) {
case L2CAP_CONF_MTU:
l2cap_pi(sk)->conf_mtu = val;
break;
case L2CAP_CONF_FLUSH_TO:
l2cap_pi(sk)->flush_to = val;
break;
case L2CAP_CONF_QOS:
break;
default:
if (hint)
break;
/* FIXME: Reject unknown option */
break;
}
}
}
static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
{
struct l2cap_conf_opt *opt = *ptr;
@ -1358,39 +1323,75 @@ static int l2cap_build_conf_req(struct sock *sk, void *data)
return ptr - data;
}
static inline int l2cap_conf_output(struct sock *sk, void **ptr)
static int l2cap_parse_conf_req(struct sock *sk, void *data)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
int result = 0;
struct l2cap_conf_rsp *rsp = data;
void *ptr = rsp->data;
void *req = pi->conf_req;
int len = pi->conf_len;
int type, hint, olen;
unsigned long val;
u16 result = L2CAP_CONF_SUCCESS;
BT_DBG("sk %p", sk);
while (len >= L2CAP_CONF_OPT_SIZE) {
len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
hint = type & 0x80;
type &= 0x7f;
switch (type) {
case L2CAP_CONF_MTU:
pi->conf_mtu = val;
break;
case L2CAP_CONF_FLUSH_TO:
pi->flush_to = val;
break;
case L2CAP_CONF_QOS:
break;
default:
if (hint)
break;
result = L2CAP_CONF_UNKNOWN;
*((u8 *) ptr++) = type;
break;
}
}
if (result == L2CAP_CONF_SUCCESS) {
/* Configure output options and let the other side know
* which ones we don't like. */
if (pi->conf_mtu < pi->omtu)
result = L2CAP_CONF_UNACCEPT;
else
pi->omtu = pi->conf_mtu;
l2cap_add_conf_opt(ptr, L2CAP_CONF_MTU, 2, pi->omtu);
BT_DBG("sk %p result %d", sk, result);
return result;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
}
static int l2cap_build_conf_rsp(struct sock *sk, void *data, int *result)
rsp->scid = cpu_to_le16(pi->dcid);
rsp->result = cpu_to_le16(result);
rsp->flags = cpu_to_le16(0x0000);
return ptr - data;
}
static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
{
struct l2cap_conf_rsp *rsp = data;
void *ptr = rsp->data;
u16 flags = 0;
BT_DBG("sk %p complete %d", sk, result ? 1 : 0);
if (result)
*result = l2cap_conf_output(sk, &ptr);
else
flags = 0x0001;
BT_DBG("sk %p", sk);
rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
rsp->result = cpu_to_le16(result ? *result : 0);
rsp->result = cpu_to_le16(result);
rsp->flags = cpu_to_le16(flags);
return ptr - data;
@ -1535,7 +1536,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
u16 dcid, flags;
u8 rsp[64];
struct sock *sk;
int result;
int len;
dcid = __le16_to_cpu(req->dcid);
flags = __le16_to_cpu(req->flags);
@ -1548,25 +1549,40 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
if (sk->sk_state == BT_DISCONN)
goto unlock;
l2cap_parse_conf_req(sk, req->data, cmd->len - sizeof(*req));
/* Reject if config buffer is too small. */
len = cmd->len - sizeof(*req);
if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
l2cap_build_conf_rsp(sk, rsp,
L2CAP_CONF_REJECT, flags), rsp);
goto unlock;
}
/* Store config. */
memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
l2cap_pi(sk)->conf_len += len;
if (flags & 0x0001) {
/* Incomplete config. Send empty response. */
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
l2cap_build_conf_rsp(sk, rsp, NULL), rsp);
l2cap_build_conf_rsp(sk, rsp,
L2CAP_CONF_SUCCESS, 0x0001), rsp);
goto unlock;
}
/* Complete config. */
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
l2cap_build_conf_rsp(sk, rsp, &result), rsp);
if (result)
len = l2cap_parse_conf_req(sk, rsp);
if (len < 0)
goto unlock;
/* Output config done */
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
/* Output config done. */
l2cap_pi(sk)->conf_state |= L2CAP_CONF_OUTPUT_DONE;
/* Reset config buffer. */
l2cap_pi(sk)->conf_len = 0;
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
sk->sk_state = BT_CONNECTED;
l2cap_chan_ready(sk);