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Bluetooth: Fix configuration of the MPS value

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We were accepting values bigger than we can accept. This was leading
ERTM to drop packets because of wrong FCS checks.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Gustavo F. Padovan 2010-05-01 16:15:40 -03:00 committed by Marcel Holtmann
parent 7b1c0049be
commit 1c7621596d
2 changed files with 22 additions and 17 deletions
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3
include/net/bluetooth/l2cap.h
View File

@ -343,7 +343,8 @@ struct l2cap_pinfo {
__u8 remote_max_tx;
__u16 retrans_timeout;
__u16 monitor_timeout;
__u16 max_pdu_size;
__u16 remote_mps;
__u16 mps;
__le16 sport;

36
net/bluetooth/l2cap.c
View File

@ -1606,21 +1606,21 @@ static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, siz
__skb_queue_head_init(&sar_queue);
control = L2CAP_SDU_START;
skb = l2cap_create_iframe_pdu(sk, msg, pi->max_pdu_size, control, len);
skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
if (IS_ERR(skb))
return PTR_ERR(skb);
__skb_queue_tail(&sar_queue, skb);
len -= pi->max_pdu_size;
size +=pi->max_pdu_size;
len -= pi->remote_mps;
size += pi->remote_mps;
control = 0;
while (len > 0) {
size_t buflen;
if (len > pi->max_pdu_size) {
if (len > pi->remote_mps) {
control |= L2CAP_SDU_CONTINUE;
buflen = pi->max_pdu_size;
buflen = pi->remote_mps;
} else {
control |= L2CAP_SDU_END;
buflen = len;
@ -1701,7 +1701,7 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms
case L2CAP_MODE_ERTM:
case L2CAP_MODE_STREAMING:
/* Entire SDU fits into one PDU */
if (len <= pi->max_pdu_size) {
if (len <= pi->remote_mps) {
control = L2CAP_SDU_UNSEGMENTED;
skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
if (IS_ERR(skb)) {
@ -2330,7 +2330,7 @@ done:
rfc.monitor_timeout = 0;
rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
rfc.max_pdu_size = pi->conn->mtu - 10;
rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
sizeof(rfc), (unsigned long) &rfc);
@ -2353,7 +2353,7 @@ done:
rfc.monitor_timeout = 0;
rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
rfc.max_pdu_size = pi->conn->mtu - 10;
rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
sizeof(rfc), (unsigned long) &rfc);
@ -2482,7 +2482,10 @@ done:
case L2CAP_MODE_ERTM:
pi->remote_tx_win = rfc.txwin_size;
pi->remote_max_tx = rfc.max_transmit;
pi->max_pdu_size = rfc.max_pdu_size;
if (rfc.max_pdu_size > pi->conn->mtu - 10)
rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
@ -2495,7 +2498,10 @@ done:
break;
case L2CAP_MODE_STREAMING:
pi->max_pdu_size = rfc.max_pdu_size;
if (rfc.max_pdu_size > pi->conn->mtu - 10)
rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
pi->conf_state |= L2CAP_CONF_MODE_DONE;
@ -2574,11 +2580,10 @@ static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data,
pi->remote_tx_win = rfc.txwin_size;
pi->retrans_timeout = rfc.retrans_timeout;
pi->monitor_timeout = rfc.monitor_timeout;
pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
pi->mps = le16_to_cpu(rfc.max_pdu_size);
break;
case L2CAP_MODE_STREAMING:
pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
break;
pi->mps = le16_to_cpu(rfc.max_pdu_size);
}
}
@ -3753,7 +3758,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
* Receiver will miss it and start proper recovery
* procedures and ask retransmission.
*/
if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
if (len > pi->mps)
goto drop;
if (l2cap_check_fcs(pi, skb))
@ -3784,8 +3789,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
if (pi->fcs == L2CAP_FCS_CRC16)
len -= 2;
if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4
|| __is_sframe(control))
if (len > pi->mps || len < 4 || __is_sframe(control))
goto drop;
if (l2cap_check_fcs(pi, skb))