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[Bluetooth] Fall back to L2CAP in basic mode

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In case the remote entity tries to negogiate retransmission or flow
control mode, reject it and fall back to basic mode.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2007-10-20 13:39:51 +02:00 committed by David S. Miller
parent f0709e03ac
commit 6464f35f37
2 changed files with 38 additions and 9 deletions
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13
include/net/bluetooth/l2cap.h
View File

@ -149,6 +149,19 @@ struct l2cap_conf_opt {
#define L2CAP_CONF_MAX_SIZE 22
struct l2cap_conf_rfc {
__u8 mode;
__u8 txwin_size;
__u8 max_transmit;
__le16 retrans_timeout;
__le16 monitor_timeout;
__le16 max_pdu_size;
} __attribute__ ((packed));
#define L2CAP_MODE_BASIC 0x00
#define L2CAP_MODE_RETRANS 0x01
#define L2CAP_MODE_FLOWCTL 0x02
struct l2cap_disconn_req {
__le16 dcid;
__le16 scid;

34
net/bluetooth/l2cap.c
View File

@ -1048,7 +1048,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, ch
opts.imtu = l2cap_pi(sk)->imtu;
opts.omtu = l2cap_pi(sk)->omtu;
opts.flush_to = l2cap_pi(sk)->flush_to;
opts.mode = 0x00;
opts.mode = L2CAP_MODE_BASIC;
len = min_t(unsigned int, sizeof(opts), optlen);
if (copy_from_user((char *) &opts, optval, len)) {
@ -1097,7 +1097,7 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
opts.imtu = l2cap_pi(sk)->imtu;
opts.omtu = l2cap_pi(sk)->omtu;
opts.flush_to = l2cap_pi(sk)->flush_to;
opts.mode = 0x00;
opts.mode = L2CAP_MODE_BASIC;
len = min_t(unsigned int, len, sizeof(opts));
if (copy_to_user(optval, (char *) &opts, len))
@ -1376,6 +1376,7 @@ static int l2cap_parse_conf_req(struct sock *sk, void *data)
int len = pi->conf_len;
int type, hint, olen;
unsigned long val;
struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
u16 mtu = L2CAP_DEFAULT_MTU;
u16 result = L2CAP_CONF_SUCCESS;
@ -1399,6 +1400,11 @@ static int l2cap_parse_conf_req(struct sock *sk, void *data)
case L2CAP_CONF_QOS:
break;
case L2CAP_CONF_RFC:
if (olen == sizeof(rfc))
memcpy(&rfc, (void *) val, olen);
break;
default:
if (hint)
break;
@ -1413,14 +1419,24 @@ static int l2cap_parse_conf_req(struct sock *sk, void *data)
/* Configure output options and let the other side know
* which ones we don't like. */
if (mtu < pi->omtu)
result = L2CAP_CONF_UNACCEPT;
else {
pi->omtu = mtu;
pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
}
if (rfc.mode == L2CAP_MODE_BASIC) {
if (mtu < pi->omtu)
result = L2CAP_CONF_UNACCEPT;
else {
pi->omtu = mtu;
pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
}
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
} else {
result = L2CAP_CONF_UNACCEPT;
memset(&rfc, 0, sizeof(rfc));
rfc.mode = L2CAP_MODE_BASIC;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
sizeof(rfc), (unsigned long) &rfc);
}
}
rsp->scid = cpu_to_le16(pi->dcid);